WO2001025675A1 - Pressure fluid hose and method of dampening pressure pulse in a hydraulic system - Google Patents

Pressure fluid hose and method of dampening pressure pulse in a hydraulic system Download PDF

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Publication number
WO2001025675A1
WO2001025675A1 PCT/FI2000/000849 FI0000849W WO0125675A1 WO 2001025675 A1 WO2001025675 A1 WO 2001025675A1 FI 0000849 W FI0000849 W FI 0000849W WO 0125675 A1 WO0125675 A1 WO 0125675A1
Authority
WO
WIPO (PCT)
Prior art keywords
hose
pressure fluid
pressure
hoses
conveyed
Prior art date
Application number
PCT/FI2000/000849
Other languages
French (fr)
Inventor
Tapani PÖYSTI
Mika Oksman
Original Assignee
Sandvik Tamrock Oy
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 Sandvik Tamrock Oy filed Critical Sandvik Tamrock Oy
Priority to AU74251/00A priority Critical patent/AU7425100A/en
Publication of WO2001025675A1 publication Critical patent/WO2001025675A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer

Definitions

  • the invention relates to a pressure fluid hose comprising at least two within one another disposed hoses, i.e. an outer hose and at least one inner hose, allowing at least two separate pressure fluid flows to be conveyed between the ends of the hose inside the inner hose and in a space defined by the outer and inner hoses.
  • the invention further relates to a method of dampening a pressure pulse caused by a rock drill in a hydraulic system.
  • Hydraulic pressure-operated actuators are used for example in rock drilling devices and other working machines, the pressure being conveyed to the actuators by means of flexible hoses.
  • Existing solutions show problems related to the durability of hoses, since a pulsating pressure stresses the connecting pieces of a hose, the hose itself and the connection therebetween.
  • a rock-drilling device usually comprises, in connection with the pressure fluid passages of the rock drill, a pressure accumulator on both the working pressure line and the return line, allowing the accumulators to compensate for any changes caused by the working cycle of the rock drill in the pressure fluid volume.
  • the object of the present invention is to provide a solution for avoid- ing problems of known solutions.
  • the pressure fluid hose of the invention is characterized in that at least the inner hose is made of a flexible material, allowing its inner diameter to expand and contract under the influence of changes in the pressure fluid conveyed in the hose in a way that allows the hose to serve simultaneously as a component dampening a pressure pulse present in the hydraulic system.
  • the method of the invention is characterized by conveying the pressure fluid needed by the rock drill and the pressure fluid returning therefrom by the use of a pressure fluid hose comprising an outer hose and at least one inner hose made of a flexible material and disposed inside the outer hose, whereby the working pressure needed by the rock drill is conveyed in the inner hose and the returning pressure fluid is conveyed in a space between the inner and outer hoses, whereby the inner hose yields under the influence of the pressure pulse present in the working pressure thus dampening the pressure pulse.
  • the pressure fluid hose comprises an outer hose, inside which one or more inner hoses are disposed. Separate pressure fluid flows are conveyed through the hose in the inner hose and in a space defined by the inner and outer hoses. At least the inner hose is made of a flexible material, whereby changes in the pressure of the pressure fluid flowing inside thereof affect the diameter of the inner hose, making the inner hose expand influenced by the pressure pulse. The pressure fluid acting outside the inner hose dampens said pulse.
  • the working pressure flow is preferably conveyed in the inner hose to an actuator, such as a rock drill or a hydraulic hammer, and the pressure fluid returning from the actuator is conveyed in the space between the outer and inner hoses to a tank.
  • the idea of an em- bodiment of the invention is to place several parallel inner hoses inside the outer hose for conveying separated pressure fluid flows. Furthermore, the essential idea of the method of the invention is to dampen the pressure pulse caused by the rock drill by using the pressure fluid hose described above.
  • An advantage of the invention is that it allows the pressure pulse of the pressure fluid conveyed inside the hose to be dampened, i.e. the hose serves as a means for dampening the vibrations in the hoses, as a kind of pressure accumulator. This avoids hose damage and other problems caused by variations in pressure. Furthermore, the construction is simple, since no conventional separate pressure accumulator is needed in connection with the hoses. The construction of the invention also allows a reduction in the number of separate hoses led to the actuators. This allows hoses to be more simply arranged in for example a rock-drilling device and simultaneously avoids hose damage due to the fastening. Furthermore, hydraulic connections in an actuator can be integrated into one place, which further simplifies the structure. A further advantage is that in case the inner hose is damaged, the leaking oil does not contaminate the environment.
  • Figure 1 is a schematic cross-section of a hose of the invention seen from its end
  • Figure 2 is a schematic sectional side view of the hose of the previous figure
  • Figure 3 is a schematic end view of another hose of the invention.
  • Figure 1 schematically shows a hose of the invention, comprising an outer hose 1 and an inner hose 2 disposed therein.
  • the inner hose is pref- erably arranged coaxially in respect of the outer hose.
  • the wall thickness and inner diameters of the hoses are dimensioned as desired, as is the relationship between the diameters of the hoses.
  • Two separate pressure fluid flows are conveyed in the hose; a first flow V., inside the inner hose and a second flow V 2 in an annular space defined by the outer and inner hoses.
  • the first flow V. is a working pressure flow for operating an actuator, such as a rock drill or a hammering apparatus.
  • the second flow V 2 is a return flow of the pressure fluid, which is led from the actuator to a tank.
  • two flows are conveyed in the hose in different directions, as Figure 2 shows.
  • the inner hose 2 is made of a flexible material, whereby the pressure pulse of the working pressure makes it expand and the volume of the inner hose increases.
  • the annular space between the outer and inner hoses contains pressure medium, which dampens the expansion of the inner hose together with the flexibility of the material of the inner hose.
  • the pressure medium therein can flow freely to the tank when the inner hose expands.
  • the outer hose is also of a flexible material, allowing it to expand in some situations under the influence of pressure changes.
  • the hose itself is a component that dampens the pressure pulse, and no conventional separate pressure accumulator is needed in connection with the hoses. Owing to the dampening, less stress than previously is directed to the hose and its connecting pieces.
  • the flows can also be arranged contrary to what was described above, i.e. the return flow in the inner hose and the working pressure flow in the annular space. In this case the pressure pulse tends to compress the inner hose and expand the outer hose to expand the annular space.
  • Figure 3 shows an embodiment where several, e.g. three inner hoses 2a to 2c are arranged inside the outer hose 1.
  • This allows several separate working pressure flows to be conveyed in the inner hoses to the actuators.
  • the return flows from the actuators can be conveyed along a common return passage, which is arranged in the space defined by the outer and inner hoses. That is, one hose unit may comprise working pressure lines for three different actuators, and their return lines, i.e. it replaces six hoses as compared with the conventional solution.
  • one hose instead of several hoses is easier to arrange in the structures. There are also fewer parts that are subject to damage.
  • lubricating and cooling medium can also be conveyed in at least some inner hoses to the actuator, and for example control pressures for using any control and adjusting means.
  • the material of the hoses is so selected that the hose is flexible un- der the influence of the pressure pulse.
  • the selection of the material and the dimensioning of the cross-sections and length of the hose allow the dampening capacity of the hose to be adjusted as desired.
  • the outer hose does not necessarily have to be flexible, provided the flows are so arranged that the working pressure is conveyed in a flexible inner hose.
  • an inner hose made of a flexible material can also be disposed inside a rigid pipe, whereby such a structure serves as a component dampening the pressure pulse in a hydraulic system.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to a pressure fluid hose comprising an outer hose (1), inside which at least one inner hose (2) is disposed. Separate pressure fluid flows (V1, V2) are conveyed inside the inner hose and in a space defined by the outer and inner hoses, respectively. At least the inner hose is made of a material allowing its cross-sectional area to change according to changes in the pressure of the pressure fluid conveyed inside the inner hose. Hence the pressure fluid acting outside the inner hose serves as a dampening element. The invention further relates to a method of dampening a pressure pulse caused by a rock drill. In accordance with the method, pressure fluid is conveyed by means of pressure fluid hoses of the invention that serve as kind of pressure accumulators dampening the pressure vibrations caused by the working cycle of the rock drill.

Description

PRESSURE FLUID HOSE AND METHOD OF DAMPENING PRESSURE PULSE IN A HYDRAULIC SYSTEM
The invention relates to a pressure fluid hose comprising at least two within one another disposed hoses, i.e. an outer hose and at least one inner hose, allowing at least two separate pressure fluid flows to be conveyed between the ends of the hose inside the inner hose and in a space defined by the outer and inner hoses.
The invention further relates to a method of dampening a pressure pulse caused by a rock drill in a hydraulic system. Hydraulic pressure-operated actuators are used for example in rock drilling devices and other working machines, the pressure being conveyed to the actuators by means of flexible hoses. Existing solutions show problems related to the durability of hoses, since a pulsating pressure stresses the connecting pieces of a hose, the hose itself and the connection therebetween. A rock-drilling device usually comprises, in connection with the pressure fluid passages of the rock drill, a pressure accumulator on both the working pressure line and the return line, allowing the accumulators to compensate for any changes caused by the working cycle of the rock drill in the pressure fluid volume. The dimensions and the reset pressure of such accumulators are ad- justed only for this purpose. However, pressure fluid hoses show vibrations due to a pressure pulse caused by the actuator. The percussion frequency of for example rock drills is about 50 to 100 Hz, and the frequency of the pressure pulse is the same. Present pressure accumulators in working pressure and return lines are incapable of evening out the vibrations in the hoses. The dampening of vibrations by arranging a specific pressure accumulator in connection with the hoses is not always feasible for example because of lack of space. Furthermore, extra pressure accumulators cause additional costs and need for maintenance. Still further, since a hydraulic actuator requires that at least one working pressure line and hydraulic fluid return line be led thereto, at least two parallel hoses have to be led to each actuator. For example a rock drill is placed at the end of a boom, which is a problematic place for leading hoses to. A large number of hoses and connecting pieces cause problems to the use of space.
The object of the present invention is to provide a solution for avoid- ing problems of known solutions.
The pressure fluid hose of the invention is characterized in that at least the inner hose is made of a flexible material, allowing its inner diameter to expand and contract under the influence of changes in the pressure fluid conveyed in the hose in a way that allows the hose to serve simultaneously as a component dampening a pressure pulse present in the hydraulic system. The method of the invention is characterized by conveying the pressure fluid needed by the rock drill and the pressure fluid returning therefrom by the use of a pressure fluid hose comprising an outer hose and at least one inner hose made of a flexible material and disposed inside the outer hose, whereby the working pressure needed by the rock drill is conveyed in the inner hose and the returning pressure fluid is conveyed in a space between the inner and outer hoses, whereby the inner hose yields under the influence of the pressure pulse present in the working pressure thus dampening the pressure pulse.
The essential idea of the invention is that the pressure fluid hose comprises an outer hose, inside which one or more inner hoses are disposed. Separate pressure fluid flows are conveyed through the hose in the inner hose and in a space defined by the inner and outer hoses. At least the inner hose is made of a flexible material, whereby changes in the pressure of the pressure fluid flowing inside thereof affect the diameter of the inner hose, making the inner hose expand influenced by the pressure pulse. The pressure fluid acting outside the inner hose dampens said pulse. The working pressure flow is preferably conveyed in the inner hose to an actuator, such as a rock drill or a hydraulic hammer, and the pressure fluid returning from the actuator is conveyed in the space between the outer and inner hoses to a tank. The idea of an em- bodiment of the invention is to place several parallel inner hoses inside the outer hose for conveying separated pressure fluid flows. Furthermore, the essential idea of the method of the invention is to dampen the pressure pulse caused by the rock drill by using the pressure fluid hose described above.
An advantage of the invention is that it allows the pressure pulse of the pressure fluid conveyed inside the hose to be dampened, i.e. the hose serves as a means for dampening the vibrations in the hoses, as a kind of pressure accumulator. This avoids hose damage and other problems caused by variations in pressure. Furthermore, the construction is simple, since no conventional separate pressure accumulator is needed in connection with the hoses. The construction of the invention also allows a reduction in the number of separate hoses led to the actuators. This allows hoses to be more simply arranged in for example a rock-drilling device and simultaneously avoids hose damage due to the fastening. Furthermore, hydraulic connections in an actuator can be integrated into one place, which further simplifies the structure. A further advantage is that in case the inner hose is damaged, the leaking oil does not contaminate the environment.
The invention will be described in greater detail in the attached drawings, in which
Figure 1 is a schematic cross-section of a hose of the invention seen from its end, Figure 2 is a schematic sectional side view of the hose of the previous figure, and
Figure 3 is a schematic end view of another hose of the invention. Figure 1 schematically shows a hose of the invention, comprising an outer hose 1 and an inner hose 2 disposed therein. The inner hose is pref- erably arranged coaxially in respect of the outer hose. The wall thickness and inner diameters of the hoses are dimensioned as desired, as is the relationship between the diameters of the hoses. Two separate pressure fluid flows are conveyed in the hose; a first flow V., inside the inner hose and a second flow V2 in an annular space defined by the outer and inner hoses. The first flow V., is a working pressure flow for operating an actuator, such as a rock drill or a hammering apparatus. The second flow V2, in turn, is a return flow of the pressure fluid, which is led from the actuator to a tank. In other words, two flows are conveyed in the hose in different directions, as Figure 2 shows. Should the inner hose get damaged and start to leak, this would, however, cause no oil leak to the outside. The leak is detected as a fall in the working pressure. The inner hose 2 is made of a flexible material, whereby the pressure pulse of the working pressure makes it expand and the volume of the inner hose increases. The annular space between the outer and inner hoses contains pressure medium, which dampens the expansion of the inner hose together with the flexibility of the material of the inner hose. Since the annular passage communicates with the tank, the pressure medium therein can flow freely to the tank when the inner hose expands. On the other hand, the outer hose is also of a flexible material, allowing it to expand in some situations under the influence of pressure changes. In other words, the hose itself is a component that dampens the pressure pulse, and no conventional separate pressure accumulator is needed in connection with the hoses. Owing to the dampening, less stress than previously is directed to the hose and its connecting pieces. The flows can also be arranged contrary to what was described above, i.e. the return flow in the inner hose and the working pressure flow in the annular space. In this case the pressure pulse tends to compress the inner hose and expand the outer hose to expand the annular space.
Figure 3 shows an embodiment where several, e.g. three inner hoses 2a to 2c are arranged inside the outer hose 1. This allows several separate working pressure flows to be conveyed in the inner hoses to the actuators. The return flows from the actuators can be conveyed along a common return passage, which is arranged in the space defined by the outer and inner hoses. That is, one hose unit may comprise working pressure lines for three different actuators, and their return lines, i.e. it replaces six hoses as compared with the conventional solution. It is obvious that one hose instead of several hoses is easier to arrange in the structures. There are also fewer parts that are subject to damage. Furthermore, in such a structure, lubricating and cooling medium can also be conveyed in at least some inner hoses to the actuator, and for example control pressures for using any control and adjusting means.
The material of the hoses is so selected that the hose is flexible un- der the influence of the pressure pulse. The selection of the material and the dimensioning of the cross-sections and length of the hose allow the dampening capacity of the hose to be adjusted as desired.
The drawings and the related description are only intended to illustrate the inventive idea. The details of the invention may vary within the scope of the claims. Accordingly, the outer hose does not necessarily have to be flexible, provided the flows are so arranged that the working pressure is conveyed in a flexible inner hose. In other words, an inner hose made of a flexible material can also be disposed inside a rigid pipe, whereby such a structure serves as a component dampening the pressure pulse in a hydraulic system.

Claims

1. A pressure fluid hose comprising at least two within one another disposed hoses, i.e. an outer hose (1) and at least one inner hose (2), allowing at least two separate pressure fluid flows (V^ V2) to be conveyed between the ends of the hose inside the inner hose and in a space defined by the outer and inner hoses, characterized in that that at least the inner hose is made of a flexible material, allowing its inner diameter to expand and contract under the influence of changes in the pressure fluid conveyed in the hose in a way that allows the hose to serve simultaneously as a component dampening a pressure pulse present in a hydraulic system.
2. A pressure fluid hose as claimed in claim 1, characterized in that a working pressure flow is arranged to be conveyed in the inner hose to an actuator connected to the hydraulic system, and the return flow of the returning pressure fluid is arranged to be conveyed in the space between the outer and inner hoses.
3. A pressure fluid hose as claimed in claim 1 or 2, characterize d in that several parallel inner hoses (2a to 2c) are arranged inside the outer hose (1 ) for conveying several different pressure fluid flows.
4. A pressure fluid hose as claimed in any one of the preceding claims, characterized in that the outer hose is also of a flexible material.
5. A pressure fluid hose as claimed in claim 2, characterized in that the pressure fluid hose is arranged in connection with a rock drilling device, in which it is arranged to convey pressure fluid to a rock drill and that the pressure fluid hose is arranged to dampen a pressure pulse caused by the working cycle of the rock drill.
6. A method of dampening a pressure pulse caused by a rock drill in a hydraulic system, characterized by conveying the pressure fluid needed by the rock drill and the pressure fluid returning therefrom by the use of a pressure fluid hose comprising an outer hose (1) and at least one inner hose (2) made of a flexible material and disposed inside the outer hose, whereby the working pressure needed by the rock drill is conveyed in the inner hose and the returning pressure fluid is conveyed in a space between the inner and outer hoses, whereby the inner hose yields under the influence of the pressure pulse present in the working pressure thus dampening the pressure pulse.
PCT/FI2000/000849 1999-10-01 2000-10-02 Pressure fluid hose and method of dampening pressure pulse in a hydraulic system WO2001025675A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74251/00A AU7425100A (en) 1999-10-01 2000-10-02 Pressure fluid hose and method of dampening pressure pulse in a hydraulic system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI19992122 1999-10-01
FI992122A FI112277B (en) 1999-10-01 1999-10-01 Pressure fluid hose and method for damping pressure pulse caused by a rock drill in a pressure fluid system

Publications (1)

Publication Number Publication Date
WO2001025675A1 true WO2001025675A1 (en) 2001-04-12

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FI (1) FI112277B (en)
WO (1) WO2001025675A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900063A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio Pollution e.g. nitrogen oxide, reduction device for internal combustion heat engine of e.g. car, has pipe including inner tube compressible based on rate adapted to compensate fluid dilatation and with heating element to heat fluid
FR2900217A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio FLUID TRANSPORT HOSE WITH COMPRESSIBLE COMPENSATION MEMBER AND FLUID TRANSPORT CIRCUIT STRING.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473565A (en) * 1966-05-25 1969-10-21 Josam Mfg Co Shock absorber for liquid flow lines
DE1775217A1 (en) * 1968-07-17 1971-07-22 Rheinisches Metallwerk Gmbh Device for preventing or reducing pressure surges in pipeline networks
WO1980001376A1 (en) * 1979-01-09 1980-07-10 Braennstroem & Lindgren Fab Ab Hose
US4315408A (en) * 1980-12-18 1982-02-16 Amtel, Inc. Offshore liquified gas transfer system
US4651781A (en) * 1984-02-02 1987-03-24 Northrop Corporation Distributed accumulator
US5497810A (en) * 1993-05-06 1996-03-12 Dayco Products, Inc. Hose assembly and method of making the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473565A (en) * 1966-05-25 1969-10-21 Josam Mfg Co Shock absorber for liquid flow lines
DE1775217A1 (en) * 1968-07-17 1971-07-22 Rheinisches Metallwerk Gmbh Device for preventing or reducing pressure surges in pipeline networks
WO1980001376A1 (en) * 1979-01-09 1980-07-10 Braennstroem & Lindgren Fab Ab Hose
US4315408A (en) * 1980-12-18 1982-02-16 Amtel, Inc. Offshore liquified gas transfer system
US4651781A (en) * 1984-02-02 1987-03-24 Northrop Corporation Distributed accumulator
US5497810A (en) * 1993-05-06 1996-03-12 Dayco Products, Inc. Hose assembly and method of making the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900063A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio Pollution e.g. nitrogen oxide, reduction device for internal combustion heat engine of e.g. car, has pipe including inner tube compressible based on rate adapted to compensate fluid dilatation and with heating element to heat fluid
FR2900217A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio FLUID TRANSPORT HOSE WITH COMPRESSIBLE COMPENSATION MEMBER AND FLUID TRANSPORT CIRCUIT STRING.

Also Published As

Publication number Publication date
AU7425100A (en) 2001-05-10
FI112277B (en) 2003-11-14
FI19992122A (en) 2001-04-02

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