CN104215284A - Detection method and detection system for flow rate of brush air pump - Google Patents
Detection method and detection system for flow rate of brush air pump Download PDFInfo
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- CN104215284A CN104215284A CN201410524916.7A CN201410524916A CN104215284A CN 104215284 A CN104215284 A CN 104215284A CN 201410524916 A CN201410524916 A CN 201410524916A CN 104215284 A CN104215284 A CN 104215284A
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- air pump
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Abstract
The invention provides a detection method and a detection system for the flow rate of a brush air pump. The detection method comprises the steps of detecting the rotation number of turns of the air pump through an infrared induction device, and then obtaining the airflow rate of the air pump through a reduction formula. The detection system comprises the air pump, a speed measurement device, and a control unit located on the air pump, wherein the air pump is connected with a motor; the speed measurement device comprises an optical grating code disc and the infrared induction device, the infrared induction device is a U-shaped bijection-type infrared sensor or a reflection-type infrared sensor, and the infrared induction device is connected with the control unit. According to the detection method and the detection system for the flow rate of the brush air pump, the problems of need of transforming an air channel and need of adding a branch channel, in the existing detection system are overcome; the detection method is free from temperature influence; the detection device is long in service, without the need of transforming an air pipeline, and capable of ensuring the accuracy and stability of measurement, has the advantages of convenient operation, low cost and the like, as well as is suitable for market promotion and high in market value.
Description
Technical field
The present invention relates to medical instruments field, be specifically related to a kind of have brush air pump flow rate testing methods and detection system.
Background technology
It is mainly in order to monitor the physiological data that patient respiration vital sign is relevant that breathing gas, anesthetic gases detect, and object is to detect gas concentrations such as CO2 out of patient respiration or the conventional anesthesia gas concentration in test breathing circuit.Detecting gas flow has two objects, and the firstth, when stopping up, gas circuit needs to report to the police, and the secondth, when changing greatly, gas flow need to automatically be adjusted to suitable flow.Monitoring of respiration mainly contains main flow and two kinds of modes of by-pass flow at present, main flow monitoring is that detection module is clipped on the adapter with window, adapter string is in breathing circuit, by adapter, analyze the gas concentration in breathing circuit, and by-pass flow monitoring is by air pump sampling section gas from breathing circuit, delivers to and in analytical equipment, test out the gas concentration in breathing circuit.
Side stream type detector sampling apparatus mainly comprises membrane pump, and the advantages such as that membrane pump has is simple in structure, good airproof performance, cost are low, technical maturity, are therefore used widely.And conventional membrane pump is all direct current generators at present, the difference according to using motor, is divided into again two kinds of DC brush, brush DCs.Brushless electric machine noise is little, the life-span long, have the advantages such as Hall feedback, but price is very expensive, is not suitable for the lower product of cost budgeting, so membrane pump often adopts brush direct current motor.Owing to there being brush air pump inside, be not with Hall speed feedback, so having the flow rate testing methods of brush air pump generally realizes by the airshed detecting in external detection air flue, concrete detection method is: a kind of is directly with flowmeter string, in pipeline, to detect, and a kind of is that differential pressure by pipe ends detects.The first scheme pick-up unit is very expensive, especially for the detection to tiny flow quantity, its pick-up unit is had relatively high expectations, equipment cost is expensive, first scheme pick-up unit is also more expensive, especially when detecting tiny flow quantity, and the multiplying arrangement of need to connecting in pipeline, to increase the pressure differential on both sides, reach the requirement of accuracy of detection.The problem that the flow sensor using in above two kinds of detection methods and pressure transducer all can have temperature to float, along with system temperature changes, sensor detects numerical value and also can change, in addition, the signal of system rear end is processed the problem that discharge circuit also can exist temperature to float, and therefore need to carry out temperature drift compensation to detection system.Above-mentioned two kinds of DC brush air pump detection meanss, all need gas circuit to transform, and need add branch road in detection system, and this cannot use at some precision detecting systems or to the conditional equipment occasion of volumetric spaces.
Summary of the invention
The present invention will solve above technical matters, and a kind of have brush air pump flow rate testing methods and detection system are provided, and can guarantee to measure ground accuracy, stability, has again simple operation, the advantage such as with low cost, is suitable for marketing, has higher marketable value.
For solving the problems of the technologies described above, the technical solution used in the present invention is: have brush air pump flow rate testing methods, comprise the following steps:
In step 1, control module, set the gas flow term of reference value that air pump per minute is inflated or bled, control module detects whether output pulse signal of infrared inductor, if pulse-free signal illustrates described air pump stall or described control module fault; If there is pulse signal, jump to step 2;
Step 2, described control module detect number of pulses Y in per minute, calculate per minute air pump rotate the number of turns by number of pulses Y/ grating encoder number of blade X in per minute;
When the pump head of step 3, described air pump rotates at every turn, output gas flow of gas is definite value V, and when the pump head by described air pump rotates at every turn, output gas flow of gas V* per minute air pump rotates the number of turns and calculates the gas flow that air pump is inflated or bled described in per minute;
Step 4, the air pump per minute calculating is inflated or the gas flow of bleeding and air pump per minute are inflated or the gas flow term of reference value of bleeding is made comparisons, if the air pump per minute calculating is inflated or the gas flow of bleeding air pump per minute inflate or the gas flow term of reference value of bleeding in, testing process finishes, otherwise, described control module sends adjustment signal to described air pump, adjusts the output power of described air pump.
There is brush air pump flow quantity detecting system, comprise air pump, speed measuring device and be positioned at the control module on described air pump, described air pump is connected with described control module, described speed measuring device comprises grating encoder and infrared inductor, described grating encoder is connected with the eccentric wheel of described air pump, and described infrared inductor is connected with described control module.
Further, described infrared inductor is correlation infrared induction structure or reflective infrared induction structure.
Further, described infrared inductor is correlation infrared induction structure, described infrared inductor is U-shaped correlation infrared sensor, described U-shaped correlation infrared sensor comprises two opposed infrared tubes, described grating encoder stretches between two opposed described infrared tubes, and described U-shaped correlation infrared sensor is connected with described control module.
Further, described infrared inductor is reflective infrared induction structure, described infrared inductor is reflection infrared sensor, and described reflection infrared sensor is positioned at described grating encoder front end, and described reflection infrared sensor is connected with described control module.
Further, described grating encoder is synchronizeed with described eccentric wheel.
Advantage and good effect that the present invention has are: have brush air pump flow rate testing methods and detection system, overcome the problem that existing detection system need to be transformed gas circuit, need add branch road, thus raw-gas flow quantity detecting system cannot be applicable to some precision, to the conditional equipment occasion of volumetric spaces.Detection system provided by the present invention is utilized intersecting respectively of infrared inductor and blade, groove and is produced the principle of height varying voltage signal, represents the rotative power of air pump, then draws air pump output gas flow of gas situation by simple computation.This detection method is temperature influence not, and pick-up unit is longer serviceable life, and does not need gas piping to carry out any transformation.Also can judge whether air pump stops up, and has or not normal work simultaneously.In addition, can also adjust the PWM dutycycle of air pump control module by judging whether in range of set value, adjust the power of air pump, thereby reach the closed-loop control of the gas flow of air pump output.There are brush air pump flow rate testing methods and detection system, can guarantee to measure ground accuracy, stability, there is again simple operation, the advantage such as with low cost, be suitable for marketing, there is higher marketable value.
Accompanying drawing explanation
Fig. 1 has brush air pump flow rate testing methods process flow diagram;
Fig. 2 is the system architecture schematic diagram having in brush air pump flow quantity detecting system when infrared inductor is correlation infrared induction structure;
Fig. 3 is the system architecture schematic diagram having in brush air pump flow quantity detecting system when infrared inductor is reflective infrared induction structure;
Fig. 4 is U-shaped correlation infrared sensor circuit diagram.
In figure:
Embodiment
As shown in Figure 3, there is brush air pump flow rate testing methods, comprise the following steps:
Step 1, in described control module, set the gas flow term of reference value that described air pump 1 per minute is inflated or bled, described control module detects whether output pulse signal of infrared inductor, if pulse-free signal, illustrates described air pump 1 stall or described control module fault; If there is pulse signal, jump to step 3;
Step 2, described control module detect number of pulses Y in per minute, calculate per minute air pump 1 rotate the number of turns by the 2 blade 6 number X of number of pulses Y/ grating encoder in per minute;
When the pump head of step 3, described air pump 1 rotates at every turn, output gas flow of gas is definite value V, and when the pump head by described air pump 1 rotates at every turn, output gas flow of gas V* per minute air pump 1 rotates the number of turns and calculates the gas flow that air pump 1 is inflated or bled described in per minute;
Step 4, described air pump 1 per minute calculating is inflated or the gas flow of bleeding and described air pump 1 per minute are inflated or the gas flow term of reference value of bleeding is made comparisons, if described air pump 1 per minute calculating is inflated or the gas flow of bleeding described air pump 1 per minute inflate or the gas flow term of reference value of bleeding in, testing process finishes, otherwise, described control module sends adjustment signal to described air pump 1, adjusts the output power of described air pump 1.Before starting this detection method, need complete following preliminary work: described grating encoder 2 is connected with the eccentric wheel 5 of described air pump 1, described control module is connected with infrared inductor with described air pump 1 respectively, start described air pump 1, make described grating encoder 2 synchronize rotation with the eccentric wheel 5 of described air pump 1.
A most preferred embodiment that is illustrated in figure 2 brush air pump flow quantity detecting system, its infrared inductor is correlation infrared induction structure.Comprise air pump 1, speed measuring device and be positioned at the control module on described air pump 1, described air pump 1 is connected with described control module, described speed measuring device comprises grating encoder 2 and infrared inductor, described grating encoder 2 is connected with the eccentric wheel 5 of described air pump 1 by connecting link 4, and described infrared inductor is connected with described control module.Described infrared inductor is correlation infrared induction structure or reflective infrared induction structure.Described infrared inductor is correlation infrared induction structure, described infrared inductor is U-shaped correlation infrared sensor 3, described U-shaped correlation infrared sensor 3 comprises two opposed infrared tubes, described grating encoder 2 stretches between two opposed described infrared tubes, and described U-shaped correlation infrared sensor 3 is connected with described control module.Wherein air pump 1 comprises that described air pump 1 is connected with described motor for driving motor and the motor drive ic of described air pump 1, and described motor is connected with described control module by described motor drive ic.The input end of described motor drive ic connects the PWM port of described control module, and the output terminal of described motor drive ic connects described motor, to described motor, exports in order to drive the pwm signal of described motor.Described grating encoder 2 is coaxial with described eccentric wheel 5.On described grating encoder 2 circumference, comprise a plurality of blades that are arranged alternately 6 and groove.Control module can adopt the conventional control device such as single-chip microcomputer, control chip, adopts 16 single-chip microcomputer MC9S12DG128B of Freescale in embodiment.
There is the implementation process of brush air pump flow quantity detecting system most preferred embodiment as follows, air pump 1 selects often to transfer out 1ml gas, the air pump 1 of voltage 5V, grating encoder 2 is provided with 5 blades that mutually replace 6 and groove, wherein the gapping interval between adjacent blades 6 and groove is about 2mm, grating encoder 2 is connected on the eccentric wheel 5 of air pump 1 by connecting link 4, grating encoder 2 stretches between two opposed infrared tubes of U-shaped correlation infrared sensor 3, U-shaped correlation infrared sensor 3 circuit design as shown in Figure 4, R200 plays the current limliting left and right of luminotron, R100 plays the effect of drawing.Along with grating encoder 2 rotates, when groove has forwarded the detecting area of U-shaped correlation infrared sensor 3 to, the infrared light of an infrared tube transmitting just can be irradiated to another infrared tube for receiving through grating encoder 2, now U-shaped correlation infrared sensor 3 conductings, AD detects mouth and will be dragged down, to a low level of control module output; If when the blade 6 of grating encoder 2 forwards between two opposed infrared tubes, blade 6 has blocked infrared light, U-shaped like this correlation infrared sensor 3 not conductings, AD detects mouth and will be drawn high, to a high level of control module output.So in air pump 1 not stall moving in the situation that, control module is exported a string square wave.At this time check system just can be measured square wave frequency, also can calculate per minute and how much turn, and process flow diagram as shown in Figure 2.First connect detection system, booster air pump 1, detects U-shaped correlation infrared sensor 3, in the situation of situation that air pump 1 is blocked completely or control module fault, and pulse-free signal; During the normal work of air pump 1, setup control unit is per second detects 6 square waves, and per minute is exactly 360 square waves.Grating encoder 2 is provided with 5 grooves (groove is more, and accuracy of detection is higher), just can calculate rotations per minute=360/5=72.Because what air pump 1 was selected is the pump that often transfers out 1ml gas, the flow that so just can calculate under current air pump 1 ruuning situation is 72ml/min, so just can carry out closed-loop control air pump 1 velocity of rotation according to flow, realize detection as shown in Figure 3, control flow.
A kind of another embodiment that has brush air pump flow quantity detecting system, described infrared inductor is reflective infrared induction structure, described infrared inductor is reflection infrared sensor 7, described reflection infrared sensor 7 is positioned at described grating encoder 2 front ends, described reflection infrared sensor 7 is connected with described control module, as shown in Figure 3.The principle of work of microreflection formula sensor 7 is, in its investigative range, if there is barrier, 7 conductings of microreflection formula sensor, and to control module output low level voltage signal, otherwise the 7 not conductings of microreflection formula sensor, and to control module output high level voltage signal.Specific operation process is, make distance between microreflection formula sensor 7 and grating encoder 2 meet the investigative range of microreflection formula sensor 7, when the groove of grating encoder 2 forwards detecting area to, the 7 not conductings of microreflection formula sensor, and to control module output high level voltage signal, when the blade 6 of grating encoder 2 forwards detecting area to, 7 conductings of microreflection formula sensor, and to control module output low level voltage signal.Adopt the detection method of detection system of this speed measuring device identical with the detection method of most preferred embodiment of the present invention, as shown in Figure 1.
Have brush air pump flow quantity detecting system and detection method, overcome the problem that existing detection system need to be transformed gas circuit, need add branch road, thus raw-gas flow quantity detecting system cannot be applicable to some precision, to the conditional equipment occasion of volumetric spaces.Detection system provided by the present invention is utilized intersecting respectively of infrared inductor and blade, groove and is produced the principle of height varying voltage signal, represents the rotative power of air pump, then draws air pump output gas flow of gas situation by simple computation.This detection method is temperature influence not, and pick-up unit is longer serviceable life, and does not need gas piping to carry out any transformation.Also can judge whether air pump stops up, and has or not normal work simultaneously.In addition, can also adjust the PWM dutycycle of air pump control module by judging whether in range of set value, adjust the power of air pump, thereby reach the closed-loop control of the gas flow of air pump output.There are brush air pump flow rate testing methods and detection system, can guarantee to measure ground accuracy, stability, there is again simple operation, the advantage such as with low cost, be suitable for marketing, there is higher marketable value.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the scope of the invention and improvement etc., within all should still belonging to this patent covering scope.
Claims (6)
1. there is brush air pump flow rate testing methods, it is characterized in that: comprise the following steps:
In step 1, control module, set the gas flow term of reference value that air pump per minute is inflated or bled, control module detects whether output pulse signal of infrared inductor, if pulse-free signal illustrates described air pump stall or described control module fault; If there is pulse signal, jump to step 2;
Step 2, described control module detect number of pulses Y in per minute, calculate per minute air pump rotate the number of turns by number of pulses Y/ grating encoder number of blade X in per minute;
When the pump head of step 3, described air pump rotates at every turn, output gas flow of gas is definite value V, and when the pump head by described air pump rotates at every turn, output gas flow of gas V* per minute air pump rotates the number of turns and calculates the gas flow that air pump is inflated or bled described in per minute;
Step 4, the air pump per minute calculating is inflated or the gas flow of bleeding and air pump per minute are inflated or the gas flow term of reference value of bleeding is made comparisons, if the air pump per minute calculating is inflated or the gas flow of bleeding air pump per minute inflate or the gas flow term of reference value of bleeding in, testing process finishes, otherwise, described control module sends adjustment signal to described air pump, adjusts the output power of described air pump.
2. there is brush air pump flow quantity detecting system, it is characterized in that: comprise air pump, speed measuring device and be positioned at the control module on described air pump, described air pump is connected with described control module, described speed measuring device comprises grating encoder and infrared inductor, described grating encoder is connected with the eccentric wheel of described air pump, and described infrared inductor is connected with described control module.
3. according to claim 2 have a brush air pump flow quantity detecting system, it is characterized in that: described infrared inductor is correlation infrared induction structure or reflective infrared induction structure.
4. according to claim 3 have a brush air pump flow quantity detecting system, it is characterized in that: described infrared inductor is correlation infrared induction structure, described infrared inductor is U-shaped correlation infrared sensor, described U-shaped correlation infrared sensor comprises two opposed infrared tubes, described grating encoder stretches between two opposed described infrared tubes, and described U-shaped correlation infrared sensor is connected with described control module.
5. according to claim 3 have a brush air pump flow quantity detecting system, it is characterized in that: described infrared inductor is reflective infrared induction structure, described infrared inductor is reflection infrared sensor, described reflection infrared sensor is positioned at described grating encoder front end, and described reflection infrared sensor is connected with described control module.
6. according to claim 2 have a brush air pump flow quantity detecting system, it is characterized in that: described grating encoder is synchronizeed with described eccentric wheel.
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| CN201410524916.7A CN104215284A (en) | 2014-10-09 | 2014-10-09 | Detection method and detection system for flow rate of brush air pump |
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| CN201410524916.7A CN104215284A (en) | 2014-10-09 | 2014-10-09 | Detection method and detection system for flow rate of brush air pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109514997A (en) * | 2019-01-22 | 2019-03-26 | 莱芜钢铁集团有限公司 | A kind of diaphragm pump operating frequency method of adjustment, system and controller |
| CN109541251A (en) * | 2019-01-03 | 2019-03-29 | 苏州汶颢微流控技术股份有限公司 | Motor speed section measuring method and measuring device |
| CN110095170A (en) * | 2019-05-16 | 2019-08-06 | 上海市供水水表强制检定站有限公司 | A kind of compulsory verification method of water supply water meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109514997B (en) * | 2019-01-22 | 2024-02-20 | 莱芜钢铁集团有限公司 | Diaphragm pump action frequency adjusting method, system and controller |
| CN110095170A (en) * | 2019-05-16 | 2019-08-06 | 上海市供水水表强制检定站有限公司 | A kind of compulsory verification method of water supply water meter |
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Application publication date: 20141217 |