WO2005003654A1 - Electronic refrigerant charging-pressure display system - Google Patents

Electronic refrigerant charging-pressure display system Download PDF

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Publication number
WO2005003654A1
WO2005003654A1 PCT/KR2003/001538 KR0301538W WO2005003654A1 WO 2005003654 A1 WO2005003654 A1 WO 2005003654A1 KR 0301538 W KR0301538 W KR 0301538W WO 2005003654 A1 WO2005003654 A1 WO 2005003654A1
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WO
WIPO (PCT)
Prior art keywords
charge
range
pressure
pressure display
refrigerant
Prior art date
Application number
PCT/KR2003/001538
Other languages
French (fr)
Inventor
Deok-Jae Lee
Original Assignee
Metachem Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metachem Inc. filed Critical Metachem Inc.
Priority to AU2003252541A priority Critical patent/AU2003252541A1/en
Publication of WO2005003654A1 publication Critical patent/WO2005003654A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays

Definitions

  • the present invention relates to an electronic refrigerant charging- pressure display system, and more particularly, to an electronic refrigerant charging-pressure display system for preventing refrigerant from being excessively charged by displaying a refrigerant charge state.
  • a manifold gauge set for an air conditioning system comprises a high-pressure hose, a high pressure gauge connected to the high- pressure side service port, a high-pressure hand valve connected to the high- pressure gauge, a low-pressure hose connected to a low-pressure side service port, a low-pressure gauge connected to the low-pressure hose, a low-pressure hand valve connected to the low-pressure gauge, and a recovery/charge hose for connecting a connecting line for connecting the high-pressure hand valve to the low-pressure hand valve to a recovery/vacuum pump.
  • a worker closes the high and low-pressure hand valves, connects the high and low-pressure hoses to the high and low-pressure service ports, respectively, and installs the manifold gauge set to the air conditioning system. After installing the manifold gauge set, the worker connects the recovery/charge hose to a recovery tank and opens the high-pressure hand valve for the refrigerant recovery. At this point, by slowly opening the high- pressure hand valve, the refrigerant is recovered to the recovery tank while suppressing the discharge of oil from the air conditioning system.
  • the worker As the refrigerant is recovered, when the high-pressure gauge indicates a level of less than 3.5 kg/cm 2 , the worker slowly opens the low-pressure hand valve until the high and low-pressure gauges indicates a level of 0 kg/cm 2 . When the high and low-pressure gauges indicate a level of 0 kg/cm 2 , the worker closes the high and low-pressure hand valves. After completing the refrigerant recovery, a vacuum operation is carried out, in which the worker connects the recovery/charge port to a vacuum pump, opens the high and low-pressure hand valves, and operates a vacuum pump for 15 minutes.
  • the worker closes the hand valves and stops the operation of the vacuum pump.
  • a refrigerant charging operation is performed, in which the worker connects the recovery/charge port to a refrigerant tank, and opens the high-pressure hand valve.
  • the refrigerant is further charged using the low-pressure hand valve.
  • the refrigerant is continuously charged until the high-pressure gauge indicates 4.2 kg/cm 2 , after which the worker closes the high and low-pressure hand valves.
  • the manifold gauge set is designed to simply charge the refrigerant depending on the worker's high-pressure observation regardless of ambient conditions such as the type of air conditioning system, kind of refrigerant, ambient temperature, and compressor rpm, it is difficult to charge an appropriate amount of refrigerant.
  • refrigerant charging methods There are two types of refrigerant charging methods: a weight charging method and a pressure-charging method.
  • a weight charging method a predetermined amount of refrigerant is charged using a balance scale, while in the pressure charging method the refrigerant is charged to an appropriate pressure level when the refrigerant has leaked.
  • the worker determines an appropriate refrigerant pressure of the particular refrigerant and the particular air conditioning system based on a
  • the present invention is directed to an electronic refrigerant charging pressure displayer that substantially obviates one or more problems due to limitations and disadvantages of the related art. It is an objective of the present invention to provide an electronic refrigerant charging pressure displayer that can prevent refrigerant from being excessively charged by displaying the refrigerant charging state of an air
  • the present invention provides an electronic refrigerant charging-pressure display system comprising a charge pressure display part provided on a printed circuit board installed around a high- pressure gauge, the charge pressure display part being designed to display a shortage/excessiveness indication range, a charge identification state range, and a proper charge range of refrigerant being charged into an air conditioning system; an ambient condition setting part for setting the shortage/excessiveness indication range, the charge identification state range, and the proper charge range in response to ambient conditions; and a control part formed of an electronic circuit that is controlled such that the shortage/excessiveness indication range, the charge identification state range, and the proper charge range of the charge pressure display part can be displayed in response to the ambient conditions set by the ambient conditions setting part.
  • the charge pressure display part further comprises a maximum/minimum pressure display part for displaying an allowable maximum/minimum charge pressure of the refrigerant.
  • the charge pressure display part comprises a series of LEDs that selectively emit light in a variety of colors to display a shortage/excessiveness indication range, a charge identification state range, and the proper charge range according to a control of the control part in response to the ambient conditions set by the ambient condition setting part. The three ranges are displayed in different color by LEDs.
  • the shortage/excessiveness indication range, the charge identification state range, and the proper charge range are displayed red, yellow, and green colors.
  • the charge pressure display part is formed of a transparent monitor that is controlled within a maximum/minimum pressure range displayed corresponding to the ambient conditions set by the ambient condition setting part and displays in different colors the shortage/excessiveness indication range, the charge identification state range, and the proper charge range.
  • the ambient condition setting part comprises an electronic thermometer for detecting an ambient temperature displayed on a temperature display part; a model selection switch for selecting a type of the air conditioning system; a refrigerant selection switch for selecting a type of refrigerant; and an rpm switch for setting an rpm of a compressor.
  • FIG. 1 is a schematic diagram of a manifold gauge set employed to an electronic refrigerant charge displayer according to a preferred embodiment of the present invention
  • FIG. 2 is a block diagram of a charge pressure display part, an ambient setting part, and a control part of an electronic refrigerant charge displayer according to a preferred embodiment of the present invention
  • FIG. 3 is a schematic diagram of a refrigerant charge display part
  • FIG. 4 is a schematic diagram of a refrigerant charge display part according to another embodiment of the present invention. PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
  • FIG. 1 shows a schematic diagram illustrating a manifold gauge set where an electronic refrigerant pressure displayer according to the present invention is employed.
  • a manifold gauge set is designed to recover refrigerant from an air conditioning system, reduce the air conditioning system to a negative pressure, and charge refrigerant into the air conditioning system.
  • the manifold gauge set comprises a high-pressure hose 1 , a high-pressure gauge 3, a low-pressure hose 5, a low-pressure gauge 7, a recovery/charge hose 9, a high-pressure hand valve 11 , and a low-pressure hand valve 13.
  • the inventive electronic refrigerant pressure displayer can be applied to other automatic apparatuses in addition to the manifold gauge set. That is, the high-pressure hose 1 is connected to a high-pressure-side service port (not shown) of the air conditioning system, the high-pressure gauge 3 is connected to the high-pressure hose 1 , and the high-pressure hand valve 11 is connected to the high-pressure gauge 3.
  • the low-pressure hose 5 is connected to a low-pressure-side service port (not shown) of the air conditioning system, the low-pressure gauge 7 is connected to the low-pressure hose 5, and the low-pressure hand valve 13 is connected to the low-pressure gauge 7.
  • the high-pressure hand valve 11 is connected to the low-pressure hand valve 13 by a connecting line 15, and the connecting line 15 is connected to the recovery/vacuum pump (not shown) by the recovery/charge hose 9.
  • the electronic refrigerant pressure displayer that can be applied to a variety of automatic apparatuses including the manifold gauge set includes a charge pressure display part 19 formed on a printed circuit board 17, an ambient condition setting part 21 , and a control part 13. It is preferable that the printed circuit board 17 is disposed around the high-pressure gauge 3.
  • the high-pressure gauge 3 can be formed as an analog type as in this embodiment, or it can be formed as a digital type.
  • the electronic charging- pressure display system includes reference data that will be compared with a charge pressure of refrigerant that is actually charged into the air conditioning system.
  • the reference data are set with reference to the type of air conditioning system, refrigerant, and ambient temperature.
  • the charge pressure display part 19 displays a current charge state of refrigerant, i.e., a shortage indication range, an excessiveness indication range, a charge identification state range, and a proper charge range. Therefore, it is preferable that the charge pressure display part 19 is provided on the printed circuit board 17 around the high-pressure gauge 3.
  • the charge pressure display part 19 is not limited to this embodiment. As an example, as shown in FIG. 3, it can be formed of a series of LEDs. The LEDs are consecutively arranged on an outer periphery of the high-pressure gauge 3.
  • the LEDs are turned on and off to display the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c.
  • the ranges 19a, 19b, and 19c can be displayed in different colors, i.e., red, yellow, and green colors. Accordingly, a worker can easily identify the proper charge of the refrigerant by checking an indicator of the high-pressure gauge 3 indicating the proper charge range 19c.
  • the charge pressure display part 19 is formed as an analog type such as with LEDs, when the high-pressure gauge is formed as a digital type, it is preferable that the charge pressure display part 19 is also formed as a digital type. At this point, the worker identifies if the current charge state is proper or not by checking whether the number indicated by the high-pressure gauge 3 is in the proper charge range formed on the charge pressure display part 19. Furthermore, it is preferable that the charge pressure display part 19 further includes a maximum/minimum charge pressure display part 25 for displaying an allowable maximum/minimum charge pressure. That is, the maximum/minimum charge pressure display part 25 displays maximum and minimum values of the proper charge pressure of the refrigerant being charged.
  • the maximum/minimum charge pressure display part 25 functions as a safety device together with the charge pressure display part 19, preventing the refrigerant from being excessively charged. That is, the worker identifies if the refrigerant is charged to a proper amount by checking if the indicator of the high-pressure gauge 3 indicates an appropriate range of the maximum/minimum pressure display part 25.
  • the ambient condition setting part 21 is designed to set the ambient conditions so that the charge pressure display part 19 displays the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c in consideration of the ambient conditions.
  • the ambient condition setting part 21 is comprised of a variety of detecting sensors and setting switches, preferably such as an electronic thermometer 27, a model selection switch 29, a refrigerant type selection switch 31 , and an rpm selection switch 33.
  • the electronic thermometer 27 is provided on a side portion of the printed circuit board 17 so as to detect an ambient temperature and display the detected ambient temperature on the temperature display part 35 of the charge pressure display part 19.
  • the model switch 29 is preferably designed to select the type of air conditioning system to be charged with the refrigerant.
  • the refrigerant selection switch 31 is preferably designed to select the refrigerant type to be charged.
  • the rpm switch 33 is designed to set an rpm of a compressor used for charging the refrigerant.
  • pressure data on the proper charge indication range 19c of the refrigerant with respect to the ambient condition data set by the ambient condition setting part 21 is stored in the control part 23. That is, the pressure data on the proper charge indication range 19c of the refrigerant in response to the ambient temperature, the specification of the air conditioning system, the type of refrigerant, and the driving rpm of the compressor are stored in the control part 23.
  • the control part 23 is designed in an electronic circuit that can display the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c.
  • the electronic circuit can be designed in a variety of structures, the detailed description of which will be omitted herein.
  • the control part 23, the ambient condition setting part 21 , and the charge pressure display part 19 are controlled to be turned on and off by a power switch 34 that are provided on the printed circuit board 17 to control a current of a battery (not shown).
  • the refrigerant recovery, vacuum, and charging processes using the manifold gauge set where the above-described inventive electronic refrigerant charging-pressure display system is used are generally identical to those used in a conventional manifold gauge, except that the ambient condition setting part 21 is further manipulated.
  • FIG. 4 shows a charge pressure display part 37 according to another embodiment of the present invention.
  • the general constitution and operation effect of the charge pressure display part 37 of this embodiment are similar to those of the charge pressure display part 19 shown in FIG. 3.
  • the charge pressure display part 19 shown in FIG. 3 is formed of a series of LEDs
  • the charge pressure display part 37 shown in FIG. 4 is formed of a transparent monitor 39.
  • the transparent monitor 39 is manipulated with a maximum/minimum range displayed in response to the ambient conditions set by the ambient condition setting part 21 such that the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c can be displayed in different colors.
  • the transparent monitor 39 is designed to numerically display the range corresponding to the set conditions in the course of the refrigerant charging process.
  • the electronic refrigerant charging-pressure display system of the present invention allows the worker to 1) compare a value indicated by an indicator of the high-pressure gauge with a reference value displayed on the charge pressure display part, and 2) identify the proper charge of the refrigerant in the air conditioning system by a) setting charge conditions of the refrigerant in response to the air conditioning system to be charged with refrigerant and b) controlling the charge pressure display part using the control part in response to the charging conditions, thereby preventing the refrigerant from being excessively charged.

Abstract

An electronic refrigerant charging-pressure display system includes a charge pressure display part provided on a printed circuit board installed around a high-pressure gauge, the charge pressure display part being designed to display a shortage/excessiveness indication range, a charge identification state range, and a proper charge range of refrigerant being charged into an air conditioning system; an ambient condition setting part for setting the shortage/excessiveness indication range, the charge identification state range, and the proper charge range in response to ambient conditions; and a control part formed of an electronic circuit that is controlled such that the shortage/excessiveness indication range, the charge identification state range, and the proper charge range of the charge pressure display part can be displayed in response to the ambient conditions set by the ambient conditions setting part.

Description

ELECTRONIC REFRIGERANT CHARGING-PRESSURE DISPLAY SYSTEM
BACKGROUND OF THE INVENTION a) Field of the Invention The present invention relates to an electronic refrigerant charging- pressure display system, and more particularly, to an electronic refrigerant charging-pressure display system for preventing refrigerant from being excessively charged by displaying a refrigerant charge state. b) Description of Related Art Generally, a manifold gauge set for an air conditioning system comprises a high-pressure hose, a high pressure gauge connected to the high- pressure side service port, a high-pressure hand valve connected to the high- pressure gauge, a low-pressure hose connected to a low-pressure side service port, a low-pressure gauge connected to the low-pressure hose, a low-pressure hand valve connected to the low-pressure gauge, and a recovery/charge hose for connecting a connecting line for connecting the high-pressure hand valve to the low-pressure hand valve to a recovery/vacuum pump. To carry out the refrigerant recovery, vacuum, and charging operations, a worker closes the high and low-pressure hand valves, connects the high and low-pressure hoses to the high and low-pressure service ports, respectively, and installs the manifold gauge set to the air conditioning system. After installing the manifold gauge set, the worker connects the recovery/charge hose to a recovery tank and opens the high-pressure hand valve for the refrigerant recovery. At this point, by slowly opening the high- pressure hand valve, the refrigerant is recovered to the recovery tank while suppressing the discharge of oil from the air conditioning system. As the refrigerant is recovered, when the high-pressure gauge indicates a level of less than 3.5 kg/cm2, the worker slowly opens the low-pressure hand valve until the high and low-pressure gauges indicates a level of 0 kg/cm2. When the high and low-pressure gauges indicate a level of 0 kg/cm2, the worker closes the high and low-pressure hand valves. After completing the refrigerant recovery, a vacuum operation is carried out, in which the worker connects the recovery/charge port to a vacuum pump, opens the high and low-pressure hand valves, and operates a vacuum pump for 15 minutes. At this point, when the low-pressure gauge indicates more than 700 mmHg, the worker closes the hand valves and stops the operation of the vacuum pump. After completing the vacuum operation, a refrigerant charging operation is performed, in which the worker connects the recovery/charge port to a refrigerant tank, and opens the high-pressure hand valve. After charging a predetermined amount of refrigerant, the refrigerant is further charged using the low-pressure hand valve. The refrigerant is continuously charged until the high-pressure gauge indicates 4.2 kg/cm2, after which the worker closes the high and low-pressure hand valves. Since the manifold gauge set is designed to simply charge the refrigerant depending on the worker's high-pressure observation regardless of ambient conditions such as the type of air conditioning system, kind of refrigerant, ambient temperature, and compressor rpm, it is difficult to charge an appropriate amount of refrigerant. There are two types of refrigerant charging methods: a weight charging method and a pressure-charging method. In the weight charging method a predetermined amount of refrigerant is charged using a balance scale, while in the pressure charging method the refrigerant is charged to an appropriate pressure level when the refrigerant has leaked. In the pressure charging method, the worker determines an appropriate refrigerant pressure of the particular refrigerant and the particular air conditioning system based on a
benchmark temperature (25 °C), and carries out the refrigerant charge by
determining a temperature variation by experience. A substitute refrigerant having a lower specific gravity than Freon gas has been used in recent years. According, when a worker uses the manifold gauge set to charge the substitute refrigerant, he/she may inadvertently charge it to an extent identical to a charging pressure that would be appropriate for Freon gas, resulting in an excessive charge of the refrigerant in the air conditioning system. SUMMARY OF THE INVENTION Accordingly, the present invention is directed to an electronic refrigerant charging pressure displayer that substantially obviates one or more problems due to limitations and disadvantages of the related art. It is an objective of the present invention to provide an electronic refrigerant charging pressure displayer that can prevent refrigerant from being excessively charged by displaying the refrigerant charging state of an air
conditioning system considering ambient conditions. To achieve the above objective, the present invention provides an electronic refrigerant charging-pressure display system comprising a charge pressure display part provided on a printed circuit board installed around a high- pressure gauge, the charge pressure display part being designed to display a shortage/excessiveness indication range, a charge identification state range, and a proper charge range of refrigerant being charged into an air conditioning system; an ambient condition setting part for setting the shortage/excessiveness indication range, the charge identification state range, and the proper charge range in response to ambient conditions; and a control part formed of an electronic circuit that is controlled such that the shortage/excessiveness indication range, the charge identification state range, and the proper charge range of the charge pressure display part can be displayed in response to the ambient conditions set by the ambient conditions setting part. Preferably, the charge pressure display part further comprises a maximum/minimum pressure display part for displaying an allowable maximum/minimum charge pressure of the refrigerant. Preferably, the charge pressure display part comprises a series of LEDs that selectively emit light in a variety of colors to display a shortage/excessiveness indication range, a charge identification state range, and the proper charge range according to a control of the control part in response to the ambient conditions set by the ambient condition setting part. The three ranges are displayed in different color by LEDs. Preferably, the shortage/excessiveness indication range, the charge identification state range, and the proper charge range are displayed red, yellow, and green colors. Preferably, the charge pressure display part is formed of a transparent monitor that is controlled within a maximum/minimum pressure range displayed corresponding to the ambient conditions set by the ambient condition setting part and displays in different colors the shortage/excessiveness indication range, the charge identification state range, and the proper charge range. The ambient condition setting part comprises an electronic thermometer for detecting an ambient temperature displayed on a temperature display part; a model selection switch for selecting a type of the air conditioning system; a refrigerant selection switch for selecting a type of refrigerant; and an rpm switch for setting an rpm of a compressor. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: FIG. 1 is a schematic diagram of a manifold gauge set employed to an electronic refrigerant charge displayer according to a preferred embodiment of the present invention; FIG. 2 is a block diagram of a charge pressure display part, an ambient setting part, and a control part of an electronic refrigerant charge displayer according to a preferred embodiment of the present invention; FIG. 3 is a schematic diagram of a refrigerant charge display part
according to an embodiment of the present invention; and FIG. 4 is a schematic diagram of a refrigerant charge display part according to another embodiment of the present invention. PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. FIG. 1 shows a schematic diagram illustrating a manifold gauge set where an electronic refrigerant pressure displayer according to the present invention is employed. A manifold gauge set is designed to recover refrigerant from an air conditioning system, reduce the air conditioning system to a negative pressure, and charge refrigerant into the air conditioning system. The manifold gauge set comprises a high-pressure hose 1 , a high-pressure gauge 3, a low-pressure hose 5, a low-pressure gauge 7, a recovery/charge hose 9, a high-pressure hand valve 11 , and a low-pressure hand valve 13. The inventive electronic refrigerant pressure displayer can be applied to other automatic apparatuses in addition to the manifold gauge set. That is, the high-pressure hose 1 is connected to a high-pressure-side service port (not shown) of the air conditioning system, the high-pressure gauge 3 is connected to the high-pressure hose 1 , and the high-pressure hand valve 11 is connected to the high-pressure gauge 3. The low-pressure hose 5 is connected to a low-pressure-side service port (not shown) of the air conditioning system, the low-pressure gauge 7 is connected to the low-pressure hose 5, and the low-pressure hand valve 13 is connected to the low-pressure gauge 7. The high-pressure hand valve 11 is connected to the low-pressure hand valve 13 by a connecting line 15, and the connecting line 15 is connected to the recovery/vacuum pump (not shown) by the recovery/charge hose 9. Furthermore, the electronic refrigerant pressure displayer that can be applied to a variety of automatic apparatuses including the manifold gauge set includes a charge pressure display part 19 formed on a printed circuit board 17, an ambient condition setting part 21 , and a control part 13. It is preferable that the printed circuit board 17 is disposed around the high-pressure gauge 3. The high-pressure gauge 3 can be formed as an analog type as in this embodiment, or it can be formed as a digital type. The electronic charging- pressure display system includes reference data that will be compared with a charge pressure of refrigerant that is actually charged into the air conditioning system. The reference data are set with reference to the type of air conditioning system, refrigerant, and ambient temperature. The charge pressure display part 19 displays a current charge state of refrigerant, i.e., a shortage indication range, an excessiveness indication range, a charge identification state range, and a proper charge range. Therefore, it is preferable that the charge pressure display part 19 is provided on the printed circuit board 17 around the high-pressure gauge 3. The charge pressure display part 19 is not limited to this embodiment. As an example, as shown in FIG. 3, it can be formed of a series of LEDs. The LEDs are consecutively arranged on an outer periphery of the high-pressure gauge 3.
In accordance with the control of the control part 23 in response to the ambient conditions set by the ambient condition setting part 21 , the LEDs are turned on and off to display the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c. The ranges 19a, 19b, and 19c can be displayed in different colors, i.e., red, yellow, and green colors. Accordingly, a worker can easily identify the proper charge of the refrigerant by checking an indicator of the high-pressure gauge 3 indicating the proper charge range 19c. In this embodiment, although the charge pressure display part 19 is formed as an analog type such as with LEDs, when the high-pressure gauge is formed as a digital type, it is preferable that the charge pressure display part 19 is also formed as a digital type. At this point, the worker identifies if the current charge state is proper or not by checking whether the number indicated by the high-pressure gauge 3 is in the proper charge range formed on the charge pressure display part 19. Furthermore, it is preferable that the charge pressure display part 19 further includes a maximum/minimum charge pressure display part 25 for displaying an allowable maximum/minimum charge pressure. That is, the maximum/minimum charge pressure display part 25 displays maximum and minimum values of the proper charge pressure of the refrigerant being charged. The maximum/minimum charge pressure display part 25 functions as a safety device together with the charge pressure display part 19, preventing the refrigerant from being excessively charged. That is, the worker identifies if the refrigerant is charged to a proper amount by checking if the indicator of the high-pressure gauge 3 indicates an appropriate range of the maximum/minimum pressure display part 25. The ambient condition setting part 21 is designed to set the ambient conditions so that the charge pressure display part 19 displays the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c in consideration of the ambient conditions. The ambient condition setting part 21 is comprised of a variety of detecting sensors and setting switches, preferably such as an electronic thermometer 27, a model selection switch 29, a refrigerant type selection switch 31 , and an rpm selection switch 33. The electronic thermometer 27 is provided on a side portion of the printed circuit board 17 so as to detect an ambient temperature and display the detected ambient temperature on the temperature display part 35 of the charge pressure display part 19. The model switch 29 is preferably designed to select the type of air conditioning system to be charged with the refrigerant. The refrigerant selection switch 31 is preferably designed to select the refrigerant type to be charged. The rpm switch 33 is designed to set an rpm of a compressor used for charging the refrigerant. In addition, it is preferable that pressure data on the proper charge indication range 19c of the refrigerant with respect to the ambient condition data set by the ambient condition setting part 21 is stored in the control part 23. That is, the pressure data on the proper charge indication range 19c of the refrigerant in response to the ambient temperature, the specification of the air conditioning system, the type of refrigerant, and the driving rpm of the compressor are stored in the control part 23. Meanwhile, the control part 23 is designed in an electronic circuit that can display the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c. The electronic circuit can be designed in a variety of structures, the detailed description of which will be omitted herein. The control part 23, the ambient condition setting part 21 , and the charge pressure display part 19 are controlled to be turned on and off by a power switch 34 that are provided on the printed circuit board 17 to control a current of a battery (not shown). The refrigerant recovery, vacuum, and charging processes using the manifold gauge set where the above-described inventive electronic refrigerant charging-pressure display system is used are generally identical to those used in a conventional manifold gauge, except that the ambient condition setting part 21 is further manipulated. That is, when the refrigerant is charged into the air conditioning system, the electronic charging-pressure display system of the present invention requires the steps of selecting the model of the air conditioning system, the type of refrigerant, and the driving rpm of the compressor in the course of the step for manipulating the manifold gauge. That is, the electronic refrigerant charging-pressure display system displays the charge state of the refrigerant on the charge pressure display part 19 in response to the ambient conditions. Accordingly, the worker charges the proper refrigerant in the air conditioning system while checking the charge pressure display part 19. FIG. 4 shows a charge pressure display part 37 according to another embodiment of the present invention. The general constitution and operation effect of the charge pressure display part 37 of this embodiment are similar to those of the charge pressure display part 19 shown in FIG. 3. Accordingly, the description of identical parts will be omitted herein, and the charge pressure display of this embodiment will be described while being compared with that shown in FIG. 3. That is, the charge pressure display part 19 shown in FIG. 3 is formed of a series of LEDs, while the charge pressure display part 37 shown in FIG. 4 is formed of a transparent monitor 39. The transparent monitor 39 is manipulated with a maximum/minimum range displayed in response to the ambient conditions set by the ambient condition setting part 21 such that the shortage/excessiveness indication range 19a, the charge identification state range 19b, and the proper charge range 19c can be displayed in different colors. The transparent monitor 39 is designed to numerically display the range corresponding to the set conditions in the course of the refrigerant charging process. As described above, the electronic refrigerant charging-pressure display system of the present invention allows the worker to 1) compare a value indicated by an indicator of the high-pressure gauge with a reference value displayed on the charge pressure display part, and 2) identify the proper charge of the refrigerant in the air conditioning system by a) setting charge conditions of the refrigerant in response to the air conditioning system to be charged with refrigerant and b) controlling the charge pressure display part using the control part in response to the charging conditions, thereby preventing the refrigerant from being excessively charged. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

WHAT IS CLAIMED IS : 1. An electronic refrigerant charging-pressure display system comprising: a charge pressure display part provided on a printed circuit board installed around a high-pressure gauge, the charge pressure display part being designed to display a shortage/excessiveness indication range, a charge identification state range, and a proper charge range of refrigerant being charged into an air conditioning system; an ambient condition setting part for setting the shortage/excessiveness indication range, the charge identification state range, and the proper charge range in response to ambient conditions; and a control part formed of an electronic circuit that is controlled such that the shortage/excessiveness indication range, the charge identification state range, and the proper charge range of the charge pressure display part can be displayed in response to the ambient conditions set by the ambient conditions setting part. 2. The electronic refrigerant charging-pressure display system of claim 1 , wherein the charge pressure display part further comprises a maximum/minimum pressure display part for displaying an allowable maximum/minimum charge pressure. 3. The electronic refrigerant charging-pressure display system of one of claims 1 and 2, wherein the charge pressure display part comprises a series of LEDs that selectively emit light in a variety of colors to display a
shortage/excessiveness indication range, a charge identification state range, and the proper charge range according to a control of the control part in response to the ambient conditions set by the ambient condition setting part. 4. The electronic refrigerant charging-pressure display system of one of claims 1 and 2, wherein the charge pressure display part is formed of a transparent monitor that is controlled within a maximum/minimum pressure range displayed corresponding to the ambient conditions set by the ambient condition setting part and displays in different colors the shortage/excessiveness indication range, the charge identification state range, and the proper charge range. 5. The electronic refrigerant charging-pressure display system of claim 1 , wherein the ambient condition setting part comprises an electronic thermometer for detecting an ambient temperature displayed on a temperature display part; a model selection switch for selecting a type of the air conditioning system; a refrigerant selection switch for selecting a type of refrigerant; and an rpm switch for setting an rpm of a compressor.
PCT/KR2003/001538 2003-07-04 2003-07-30 Electronic refrigerant charging-pressure display system WO2005003654A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003252541A AU2003252541A1 (en) 2003-07-04 2003-07-30 Electronic refrigerant charging-pressure display system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2003-0045174 2003-07-04
KR1020030045174A KR100465013B1 (en) 2003-07-04 2003-07-04 Electro type charged refrigerants pressure displayer

Publications (1)

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WO2005003654A1 true WO2005003654A1 (en) 2005-01-13

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KR (1) KR100465013B1 (en)
AU (1) AU2003252541A1 (en)
WO (1) WO2005003654A1 (en)

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JP2020060430A (en) * 2018-10-09 2020-04-16 プロステップ株式会社 Manifold gauge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100960558B1 (en) 2008-05-29 2010-06-03 주식회사 에어-텍 high pressure standard pressure indicator for recovering, recycling and replenishing apparatus and recovering, recycling and replenishing apparatus with high pressure standard pressure indicator

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US5231841A (en) * 1991-12-19 1993-08-03 Mcclelland Ralph A Refrigerant charging system and control system therefor
JPH062994A (en) * 1992-06-19 1994-01-11 Hitachi Bill Shisetsu Eng Kk Method and apparatus for adjusting temperature and pressure for recovery of refrigerant
US5860286A (en) * 1997-06-06 1999-01-19 Carrier Corporation System monitoring refrigeration charge
KR20010029018A (en) * 1999-09-28 2001-04-06 윤종용 Automatic refrigerant injecting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231841A (en) * 1991-12-19 1993-08-03 Mcclelland Ralph A Refrigerant charging system and control system therefor
JPH062994A (en) * 1992-06-19 1994-01-11 Hitachi Bill Shisetsu Eng Kk Method and apparatus for adjusting temperature and pressure for recovery of refrigerant
US5860286A (en) * 1997-06-06 1999-01-19 Carrier Corporation System monitoring refrigeration charge
KR20010029018A (en) * 1999-09-28 2001-04-06 윤종용 Automatic refrigerant injecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020060430A (en) * 2018-10-09 2020-04-16 プロステップ株式会社 Manifold gauge
JP7158715B2 (en) 2018-10-09 2022-10-24 プロステップ株式会社 manifold gauge

Also Published As

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AU2003252541A1 (en) 2005-01-21
KR100465013B1 (en) 2005-01-13

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