US20060120883A1 - Displacement control valve of a variable displacement swash plate - Google Patents
Displacement control valve of a variable displacement swash plate Download PDFInfo
- Publication number
- US20060120883A1 US20060120883A1 US11/281,469 US28146905A US2006120883A1 US 20060120883 A1 US20060120883 A1 US 20060120883A1 US 28146905 A US28146905 A US 28146905A US 2006120883 A1 US2006120883 A1 US 2006120883A1
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- United States
- Prior art keywords
- valve
- hole
- chest
- swash plate
- valve body
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/1822—Valve-controlled fluid connection
- F04B2027/1827—Valve-controlled fluid connection between crankcase and discharge chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/184—Valve controlling parameter
- F04B2027/1854—External parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/184—Valve controlling parameter
- F04B2027/1859—Suction pressure
Definitions
- the present invention relates to a displacement control valve of a variable displacement swash plate compressor.
- Japanese Patent Laid-Open Publication No. 9-268973 discloses a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor.
- valve body opens and closes the valve hole to control the introduction of the refrigerant gas in the outlet chamber into the crank chamber, thereby controlling the internal pressure in the crank chamber and the displacement of the compressor.
- refrigerant gas pressure in the inlet chamber is controlled at a desired level.
- the aforementioned displacement control valve has a problem in that small particles of foreign matter or abraded matter in the compressor, or small particles of foreign matter in an external refrigeration circuit flow through the inlet hole into the valve chest entrained by the refrigerant gas to invade into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body, thereby preventing smooth movement of the valve shaft and the operation of the displacement control valve.
- An object of the present invention is to provide a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor, and wherein invasion of small particles of foreign matter into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is prevented.
- a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor, and wherein the inlet hole is directed at right angle to and located radially offset from the central axis of the valve chest.
- refrigerant gas passed into the valve chest through the inlet hole whirls in the valve chest to apply centrifugal force to small particles of foreign matter dispersed in the refrigerant gas, thereby making them move toward the circumferential wall of the valve chest because the inlet hole is directed at right angle to and located radially offset from the central axis of the valve chest.
- the small particles of foreign matter dispersed in the refrigerant gas are kept away from the vicinity of the valve shaft inserting hole located at the center of the one end wall of the valve chest. Therefore, invasion of small particles of foreign matter into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is prevented.
- valve chest is provided with a plurality of inlet holes circumferentially distanced from each other.
- valve chest When the valve chest is provided with a plurality of inlet holes circumferentially distanced from each other, generation of the whirl movement of the refrigerant gas in the valve chest is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- the inlet hole is directed tangentially to the circumferential wall of the valve chest.
- the valve chest has a cylindrical shape.
- valve chest When the valve chest has a cylindrical shape, generation of the whirl movement of the refrigerant gas in the valve chest is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- valve chest has a truncated-cone-shape convex toward the other end wall.
- valve chest has a truncated-cone-shape convex toward the other end wall, the flow of the refrigerant gas from the inlet hole to the valve hole at the time when the valve hole is opened becomes smooth. Therefore, the small particles of foreign matter are discharged from the valve chest more easily.
- a tube member surrounding the valve shaft inserting hole extends from the one end wall of the valve chest toward the other end wall of the valve chest beyond the inlet hole.
- FIG. 1 is a sectional view of a variable displacement swash plate compressor provided with a displacement control valve in accordance with a preferred embodiment of the present invention.
- FIG. 2 is a sectional view of a displacement control valve in accordance with a preferred embodiment of the present invention.
- FIG. 3 is a view in the direction of arrows III-III in FIG. 2 .
- FIG. 4 is a fragmentary sectional view of a displacement control valve in accordance with another preferred embodiment of the present invention.
- FIG. 5 is a fragmentary sectional view of a displacement control valve in accordance with another preferred embodiment of the present invention.
- FIG. 6 is a view in the direction of arrows VI-VI in FIG. 5 .
- a displacement control valve of a variable displacement swash plate compressor in accordance with a preferred embodiment of the present invention will be described.
- a variable displacement swash plate compressor A is provided with a rotating shaft 10 , a rotor 11 fixed to the rotating shaft 10 , a swash plate 12 fitted on the rotating shaft 10 to engage the rotating shaft 10 sidably and to be variable in inclination relative to the rotating shaft 10 .
- the swash plate 12 is connected to the rotor 11 through a linkage 13 to be variable in inclination relative to the driving shaft 10 , thereby rotating synchronously with the rotating shaft 10 .
- a plurality of pistons 15 engage the swash plate 12 through a plurality of pairs of shoes 14 that slidably engage the outer peripheral portion of the swash plate 12 .
- the pistons 15 are inserted into cylinder bores 16 a formed in a cylinder block 16 .
- the plurality of pairs of shoes 14 , the pistons 15 and the cylinder bores 16 a are distanced from each other in the circumferential direction.
- a dish-shaped front housing 18 cooperates with the cylinder block 16 to form a crank chamber 17 for accommodating the rotating shaft 10 , the rotor 11 and the swash plate 12 .
- One end portion of the rotating shaft 10 passes through the front housing 18 to extend out of the front housing 18 .
- a seal member 19 is disposed in the annular space between the front housing 18 and the rotating shaft 10 .
- a pulley 20 fixed to the one end portion of the rotating shaft 10 is connected to a car engine not shown in the drawings through an endless belt not shown in the drawings.
- a cylinder head 23 is installed to form an inlet chamber 21 and an outlet chamber 22 .
- the inlet chamber 21 communicates with the radiator of a car air conditioner through an inlet port not shown in the drawings.
- the outlet chamber 22 communicates with the condenser of the car air conditioner through an outlet port not shown in the drawings.
- a valve plate 24 is disposed between the cylinder block 16 and the cylinder head 23 .
- the valve plate is provided with inlet holes and outlet holes communicating with the cylinder bores 16 a . Inlet valves and outlet valves are fitted to the valve plate 24 .
- the crank chamber 17 communicates with the inlet chamber 21 through an orifice hole 24 a formed in the valve plate 24 .
- the front housing 18 , the cylinder block 16 , the valve plate 24 and the cylinder head 23 are assembled as a unitary body by a plurality of through bolts 25 circumferentially distanced from each other.
- a displacement control valve B for controlling the displacement of the variable displacement swash plate compressor A is fitted in and fixed to a concave 26 formed in the cylinder head 23 adjacent to the outlet chamber 22 and communicating with the inlet chamber 21 .
- the displacement control valve B comprises a pressure sensitive chamber 201 and a bellows 202 disposed in the pressure sensitive chamber 201 .
- the pressure sensitive chamber 201 communicates with the inlet chamber 21 through a communicating hole 201 a formed in the circumferential wall.
- the bellows 202 is provided with a vacuum inner space and a spring disposed in the inner space.
- the bellows 202 operates as a pressure sensitive member for receiving internal pressure of the inlet chamber 21 (hereinafter called inlet pressure).
- a pressure sensitive rod 204 is slidably supported by a valve casing 203 and abuts the bellows 202 at one end.
- a valve body 206 is formed integrally with the pressure sensitive rod 204 .
- the valve body 206 opens and closes a valve hole 203 a depending on the telescopic motion of the bellows 202 to open and close a communication passage between the outlet chamber 22 and the crank chamber 17 extending from the outlet chamber 22 through a communication passage 27 , inlet holes 203 b , a tube-shaped valve chest 205 , the valve hole 203 a , outlet holes 203 c and a communication passage 28 to the crank chamber 17 .
- the valve body 206 is provided with a valve shaft 206 a sidably supported by a fixed iron core 207 .
- a solenoid rod 209 abuts one end of the valve shaft 206 a at one end.
- the solenoid rod 209 is passed through a through hole 207 a formed in the fixed iron core 207 without contacting the circumferential wall of the through hole 207 a at the longitudinal middle and fixed to a plunger 208 at the other end.
- the plunger 208 is forced in the closing direction of the valve body 206 by a spring 210 .
- the plunger 208 is slidably supported at the outer circumference by a tube 212 made of non-magnetic material and fixed to a solenoid housing 211 .
- An electromagnetic coil 213 fixed to the solenoid housing 211 surrounds the tube 212 .
- the valve chest 205 is made cylindrical.
- the valve chest 205 is provided with a valve shaft inserting hole 207 b through which the valve shaft 206 a is passed slidably at the center of one end wall formed by the fixed iron core 207 .
- the valve chest 205 is provided with the inlet holes 203 b at a circumferential wall and the valve hole 203 a at the other end wall.
- the inlet holes 203 b communicate with the outlet chamber 22 through the communication passage 27 .
- the valve hole 203 a communicates with the crank chamber 17 through the outlet holes 203 c and the communication passage 28 .
- valve shaft inserting hole 207 b and the valve hole 203 a extend coaxially with the central axis X of the valve chest 205 .
- the valve body 206 moves reciprocally in the valve chest 205 along the central axis X to open and close the valve hole 203 a.
- the inlet holes 203 b are directed at right angle to and located radially offset from the central axis X of the valve chest 205 .
- the bellows 202 is supported by a bellows guide 214 at the lower end.
- the bellows guide 214 is sidably supported by a pressure setting member 215 forming the bottom wall of the pressure sensitive chamber 201 .
- a spring 216 is disposed between the pressure setting member 215 and the bellows guide 214 to force the bellows 202 in the opening direction of the valve body 206 .
- the control characteristics of the displacement control valve B is adjusted by adjusting the depth to which the pressure setting member 215 is press fitted into the circumferential wall of the pressure sensitive chamber 201 .
- the pressure sensitive chamber 201 communicates with the through hole 207 a of the fixed iron core 207 through a pressure introducing passage 203 d . Therefore, the one end of the valve shaft 206 a opposing the through hole 207 a of the fixed iron core 207 , the fixed iron core 207 , the plunger 208 and the spring 210 receive the inlet pressure.
- the sectional area of the valve shaft 206 a is made slightly larger than that of the valve hole 203 a to prevent the internal pressure of the outlet chamber 22 (hereinafter called outlet pressure) from forcing the valve body 206 in the closing direction thereof.
- Refrigerant gas leaks from the valve chest 205 to the through hole 207 a of the fixed iron core 207 through an annular space between the valve shaft 206 a and the circumferential wall of the valve shaft inserting hole 207 b .
- the leakage of the refrigerant gas does not affect the internal pressure of the through hole 207 a of the fixed iron core 207 because the flow rate of the leaking refrigerant gas is very low and the refrigerant gas leaked from the valve chest 205 into the through hole 207 a is discharged to the inlet chamber 21 through the pressure introducing passage 203 d and the pressure sensitive chamber 201 .
- the electromagnetic force generated by the electromagnetic coil 213 acts upon the one end of the valve shaft 206 a through the plunger 208 and the solenoid rod 209 to force the valve body 206 in the closing direction thereof.
- the bellows 202 expands when the inlet pressure is lower than a predetermined level to push the valve body 206 in the opening direction thereof against the electromagnetic force generated by the electromagnetic coil 213 , thereby opening the valve hole 203 a .
- the outlet pressure is introduced to the crank chamber 17 to increase the internal pressure of the crank chamber 17 (hereinafter called crank chamber pressure), thereby decreasing the inclination of the swash plate 12 and decreasing the displacement of the compressor A.
- crank chamber pressure the internal pressure of the crank chamber 17
- the flow rate of the refrigerant gas circulating through the external refrigeration circuit decreases to increase the inlet pressure.
- the bellows 202 contracts.
- the electromagnetic force generated by the electromagnetic coil 213 pushes the valve body 206 in the closing direction thereof to close the valve hole 203 a .
- introduction of the refrigerant gas to the crank chamber 17 is stopped.
- the crank chamber pressure decreases as the refrigerant gas in the crank chamber 17 discharges to the inlet chamber 21 through the orifice hole 24 a to increase the inclination of the swash plate 12 , thereby increasing the displacement of the compressor A.
- the flow rate of the refrigerant gas circulating through the external refrigeration circuit increases to decrease the inlet pressure.
- the opening and closing of the valve hole 203 a is repeated to maintain the inlet pressure at the predetermined level, thereby maintaining comfortable car air conditioning.
- the amount of electric current supply to the electromagnetic coil 213 uniquely determines the operation point of the internal displacement control valve constituted by the bellows 202 , the pressure sensitive rod 204 and the valve body 206 .
- the small particles of foreign matter dispersed in the refrigerant gas are kept away from the vicinity of the valve shaft inserting hole 207 b located at the center of the one end wall of the valve chest 205 . Therefore, invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole 207 b and the valve shaft 206 a of the valve body 206 is prevented.
- the valve chest 205 is cylindrically shaped. Therefore, generation of the whirl movement of the refrigerant gas in the valve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole 207 b and the valve shaft 206 a of the valve body 206 is promoted.
- inlet holes 203 b It is possible to direct the inlet holes 203 b tangentially to the circumferential wall of the valve chest 205 as shown in FIG. 3 ( b ).
- the inlet holes 203 b are directed tangentially to the circumferential wall of the valve chest 205 , generation of the whirl movement of the refrigerant gas in the valve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole 207 b and the valve shaft 206 a of the valve body 206 is promoted.
- valve chest 205 When the valve chest 205 is provided with a plurality of inlet holes 203 b circumferentially distanced from each other, generation of the whirl movement of the refrigerant gas in the valve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into a space between the circumferential wall of the valve shaft inserting hole 207 b and the valve shaft 206 a of the valve body 206 is promoted.
- valve chest 205 truncated-cone-shaped convex toward the other end wall provided with the valve hole 203 a as shown in FIG. 4 .
- the valve chest 205 is given a truncated-cone-shape convex toward the other end wall provided with the valve hole 203 a , the flow of the refrigerant gas from the inlet holes 203 b to the valve hole 203 a at the time when the valve hole 203 a is opened becomes smooth. Therefore, the small particles of foreign matter are discharged from the valve chest 205 more easily.
- the present invention can be widely used for displacement control valves of variable displacement swash plate compressors.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A displacement control valve of a variable displacement swash plate compressor comprises a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end. The inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor. The inlet hole is directed at right angle to and disposed offset in the radial direction from the central axis of the valve chest.
Description
- The present invention relates to a displacement control valve of a variable displacement swash plate compressor.
- Japanese Patent Laid-Open Publication No. 9-268973 discloses a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor.
- In the aforementioned displacement control valve, the valve body opens and closes the valve hole to control the introduction of the refrigerant gas in the outlet chamber into the crank chamber, thereby controlling the internal pressure in the crank chamber and the displacement of the compressor. As a result, refrigerant gas pressure in the inlet chamber is controlled at a desired level.
- The aforementioned displacement control valve has a problem in that small particles of foreign matter or abraded matter in the compressor, or small particles of foreign matter in an external refrigeration circuit flow through the inlet hole into the valve chest entrained by the refrigerant gas to invade into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body, thereby preventing smooth movement of the valve shaft and the operation of the displacement control valve.
- An object of the present invention is to provide a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor, and wherein invasion of small particles of foreign matter into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is prevented.
- In accordance with the present invention, there is provided a displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor, and wherein the inlet hole is directed at right angle to and located radially offset from the central axis of the valve chest.
- In the displacement control valve of the present invention, refrigerant gas passed into the valve chest through the inlet hole whirls in the valve chest to apply centrifugal force to small particles of foreign matter dispersed in the refrigerant gas, thereby making them move toward the circumferential wall of the valve chest because the inlet hole is directed at right angle to and located radially offset from the central axis of the valve chest. As a result, the small particles of foreign matter dispersed in the refrigerant gas are kept away from the vicinity of the valve shaft inserting hole located at the center of the one end wall of the valve chest. Therefore, invasion of small particles of foreign matter into a space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is prevented.
- In a preferred embodiment of the present invention, the valve chest is provided with a plurality of inlet holes circumferentially distanced from each other.
- When the valve chest is provided with a plurality of inlet holes circumferentially distanced from each other, generation of the whirl movement of the refrigerant gas in the valve chest is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- In another preferred embodiment of the present invention, the inlet hole is directed tangentially to the circumferential wall of the valve chest.
- When the inlet hole is directed tangentially to the circumferential wall of the valve chest, generation of the whirl movement of the refrigerant gas in the valve chest is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- In another preferred embodiment of the present invention, the valve chest has a cylindrical shape.
- When the valve chest has a cylindrical shape, generation of the whirl movement of the refrigerant gas in the valve chest is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- In another preferred embodiment of the present invention, the valve chest has a truncated-cone-shape convex toward the other end wall.
- When the valve chest has a truncated-cone-shape convex toward the other end wall, the flow of the refrigerant gas from the inlet hole to the valve hole at the time when the valve hole is opened becomes smooth. Therefore, the small particles of foreign matter are discharged from the valve chest more easily.
- In another preferred embodiment of the present invention, a tube member surrounding the valve shaft inserting hole extends from the one end wall of the valve chest toward the other end wall of the valve chest beyond the inlet hole.
- When a tube member surrounding the valve shaft inserting hole extends from the one end wall of the valve chest toward the other end wall of the valve chest beyond the inlet hole, the refrigerant gas entering in the valve chest through the inlet hole flows in an annular space between the circumferential wall of the valve chest and the tube member. Therefore, generation of the whirl movement of the refrigerant gas is promoted, the whirl flow of the refrigerant gas is prevented from directly contacting the valve shaft inserting hole, and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valve shaft inserting hole and the valve shaft of the valve body is promoted.
- In the drawings:
-
FIG. 1 is a sectional view of a variable displacement swash plate compressor provided with a displacement control valve in accordance with a preferred embodiment of the present invention. -
FIG. 2 is a sectional view of a displacement control valve in accordance with a preferred embodiment of the present invention. -
FIG. 3 is a view in the direction of arrows III-III inFIG. 2 . -
FIG. 4 is a fragmentary sectional view of a displacement control valve in accordance with another preferred embodiment of the present invention. -
FIG. 5 is a fragmentary sectional view of a displacement control valve in accordance with another preferred embodiment of the present invention. -
FIG. 6 is a view in the direction of arrows VI-VI inFIG. 5 . - A displacement control valve of a variable displacement swash plate compressor in accordance with a preferred embodiment of the present invention will be described.
- As shown in
FIG. 1 , a variable displacement swash plate compressor A is provided with arotating shaft 10, arotor 11 fixed to the rotatingshaft 10, aswash plate 12 fitted on the rotatingshaft 10 to engage the rotatingshaft 10 sidably and to be variable in inclination relative to the rotatingshaft 10. Theswash plate 12 is connected to therotor 11 through alinkage 13 to be variable in inclination relative to thedriving shaft 10, thereby rotating synchronously with the rotatingshaft 10. - A plurality of
pistons 15 engage theswash plate 12 through a plurality of pairs ofshoes 14 that slidably engage the outer peripheral portion of theswash plate 12. Thepistons 15 are inserted intocylinder bores 16 a formed in acylinder block 16. - The plurality of pairs of
shoes 14, thepistons 15 and the cylinder bores 16 a are distanced from each other in the circumferential direction. - A dish-shaped
front housing 18 cooperates with thecylinder block 16 to form acrank chamber 17 for accommodating the rotatingshaft 10, therotor 11 and theswash plate 12. - One end portion of the rotating
shaft 10 passes through thefront housing 18 to extend out of thefront housing 18. Aseal member 19 is disposed in the annular space between thefront housing 18 and the rotatingshaft 10. - A
pulley 20 fixed to the one end portion of the rotatingshaft 10 is connected to a car engine not shown in the drawings through an endless belt not shown in the drawings. - A
cylinder head 23 is installed to form aninlet chamber 21 and anoutlet chamber 22. Theinlet chamber 21 communicates with the radiator of a car air conditioner through an inlet port not shown in the drawings. Theoutlet chamber 22 communicates with the condenser of the car air conditioner through an outlet port not shown in the drawings. - A
valve plate 24 is disposed between thecylinder block 16 and thecylinder head 23. The valve plate is provided with inlet holes and outlet holes communicating with thecylinder bores 16 a. Inlet valves and outlet valves are fitted to thevalve plate 24. - The
crank chamber 17 communicates with theinlet chamber 21 through an orifice hole 24 a formed in thevalve plate 24. - The
front housing 18, thecylinder block 16, thevalve plate 24 and thecylinder head 23 are assembled as a unitary body by a plurality of throughbolts 25 circumferentially distanced from each other. - A displacement control valve B for controlling the displacement of the variable displacement swash plate compressor A is fitted in and fixed to a concave 26 formed in the
cylinder head 23 adjacent to theoutlet chamber 22 and communicating with theinlet chamber 21. - As shown in
FIG. 2 , the displacement control valve B comprises a pressuresensitive chamber 201 and abellows 202 disposed in the pressuresensitive chamber 201. The pressuresensitive chamber 201 communicates with theinlet chamber 21 through a communicatinghole 201 a formed in the circumferential wall. Thebellows 202 is provided with a vacuum inner space and a spring disposed in the inner space. The bellows 202 operates as a pressure sensitive member for receiving internal pressure of the inlet chamber 21 (hereinafter called inlet pressure). A pressuresensitive rod 204 is slidably supported by avalve casing 203 and abuts thebellows 202 at one end. Avalve body 206 is formed integrally with the pressuresensitive rod 204. Thevalve body 206 opens and closes avalve hole 203 a depending on the telescopic motion of thebellows 202 to open and close a communication passage between theoutlet chamber 22 and thecrank chamber 17 extending from theoutlet chamber 22 through acommunication passage 27,inlet holes 203 b, a tube-shaped valve chest 205, thevalve hole 203 a,outlet holes 203 c and acommunication passage 28 to thecrank chamber 17. Thevalve body 206 is provided with avalve shaft 206 a sidably supported by a fixediron core 207. Asolenoid rod 209 abuts one end of thevalve shaft 206 a at one end. Thesolenoid rod 209 is passed through a throughhole 207 a formed in the fixediron core 207 without contacting the circumferential wall of the throughhole 207 a at the longitudinal middle and fixed to aplunger 208 at the other end. Theplunger 208 is forced in the closing direction of thevalve body 206 by aspring 210. Theplunger 208 is slidably supported at the outer circumference by atube 212 made of non-magnetic material and fixed to asolenoid housing 211. Anelectromagnetic coil 213 fixed to thesolenoid housing 211 surrounds thetube 212. - As shown in
FIGS. 2 and 3 (a), thevalve chest 205 is made cylindrical. Thevalve chest 205 is provided with a valveshaft inserting hole 207 b through which thevalve shaft 206 a is passed slidably at the center of one end wall formed by the fixediron core 207. Thevalve chest 205 is provided with the inlet holes 203 b at a circumferential wall and thevalve hole 203 a at the other end wall. The inlet holes 203 b communicate with theoutlet chamber 22 through thecommunication passage 27. Thevalve hole 203 a communicates with thecrank chamber 17 through the outlet holes 203 c and thecommunication passage 28. The valveshaft inserting hole 207 b and thevalve hole 203 a extend coaxially with the central axis X of thevalve chest 205. Thevalve body 206 moves reciprocally in thevalve chest 205 along the central axis X to open and close thevalve hole 203 a. - As shown in
FIGS. 2 and 3 (a), the inlet holes 203 b are directed at right angle to and located radially offset from the central axis X of thevalve chest 205. - The bellows 202 is supported by a bellows guide 214 at the lower end. The bellows guide 214 is sidably supported by a
pressure setting member 215 forming the bottom wall of the pressuresensitive chamber 201. Aspring 216 is disposed between thepressure setting member 215 and the bellows guide 214 to force thebellows 202 in the opening direction of thevalve body 206. The control characteristics of the displacement control valve B is adjusted by adjusting the depth to which thepressure setting member 215 is press fitted into the circumferential wall of the pressuresensitive chamber 201. - The pressure
sensitive chamber 201 communicates with the throughhole 207 a of the fixediron core 207 through apressure introducing passage 203 d. Therefore, the one end of thevalve shaft 206 a opposing the throughhole 207 a of the fixediron core 207, the fixediron core 207, theplunger 208 and thespring 210 receive the inlet pressure. - The sectional area of the
valve shaft 206 a is made slightly larger than that of thevalve hole 203 a to prevent the internal pressure of the outlet chamber 22 (hereinafter called outlet pressure) from forcing thevalve body 206 in the closing direction thereof. - Refrigerant gas leaks from the
valve chest 205 to the throughhole 207 a of the fixediron core 207 through an annular space between thevalve shaft 206 a and the circumferential wall of the valveshaft inserting hole 207 b. However, the leakage of the refrigerant gas does not affect the internal pressure of the throughhole 207 a of the fixediron core 207 because the flow rate of the leaking refrigerant gas is very low and the refrigerant gas leaked from thevalve chest 205 into the throughhole 207 a is discharged to theinlet chamber 21 through thepressure introducing passage 203 d and the pressuresensitive chamber 201. - The electromagnetic force generated by the
electromagnetic coil 213 acts upon the one end of thevalve shaft 206 a through theplunger 208 and thesolenoid rod 209 to force thevalve body 206 in the closing direction thereof. - The operation of the displacement control valve B will be described.
- In the displacement control valve B, the
bellows 202 expands when the inlet pressure is lower than a predetermined level to push thevalve body 206 in the opening direction thereof against the electromagnetic force generated by theelectromagnetic coil 213, thereby opening thevalve hole 203 a. The outlet pressure is introduced to the crankchamber 17 to increase the internal pressure of the crank chamber 17 (hereinafter called crank chamber pressure), thereby decreasing the inclination of theswash plate 12 and decreasing the displacement of the compressor A. As a result, the flow rate of the refrigerant gas circulating through the external refrigeration circuit decreases to increase the inlet pressure. When the inlet pressure exceeds the predetermined level, thebellows 202 contracts. The electromagnetic force generated by theelectromagnetic coil 213 pushes thevalve body 206 in the closing direction thereof to close thevalve hole 203 a. As a result, introduction of the refrigerant gas to the crankchamber 17 is stopped. The crank chamber pressure decreases as the refrigerant gas in thecrank chamber 17 discharges to theinlet chamber 21 through the orifice hole 24 a to increase the inclination of theswash plate 12, thereby increasing the displacement of the compressor A. As a result, the flow rate of the refrigerant gas circulating through the external refrigeration circuit increases to decrease the inlet pressure. The opening and closing of thevalve hole 203 a is repeated to maintain the inlet pressure at the predetermined level, thereby maintaining comfortable car air conditioning. - The amount of electric current supply to the
electromagnetic coil 213 uniquely determines the operation point of the internal displacement control valve constituted by thebellows 202, the pressuresensitive rod 204 and thevalve body 206. - In the displacement control valve B, refrigerant gas passed into the
valve chest 205 through the inlet holes 203 b whirls in thevalve chest 205 as indicated by arrows inFIG. 3 (a) because the inlet holes 203 b are directed at right angle to and located radially offset from the central axis X of thevalve chest 205. Small particles of foreign matter or abraded matter in the compressor, or small particles of foreign matter in the external refrigeration circuit, which are dispersed in the refrigerant gas, receive centrifugal force to move toward the circumferential wall of thevalve chest 205. As a result, the small particles of foreign matter dispersed in the refrigerant gas are kept away from the vicinity of the valveshaft inserting hole 207 b located at the center of the one end wall of thevalve chest 205. Therefore, invasion of small particles of foreign matter into the space between the circumferential wall of the valveshaft inserting hole 207 b and thevalve shaft 206 a of thevalve body 206 is prevented. - The
valve chest 205 is cylindrically shaped. Therefore, generation of the whirl movement of the refrigerant gas in thevalve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valveshaft inserting hole 207 b and thevalve shaft 206 a of thevalve body 206 is promoted. - It is possible to direct the inlet holes 203 b tangentially to the circumferential wall of the
valve chest 205 as shown inFIG. 3 (b). When the inlet holes 203 b are directed tangentially to the circumferential wall of thevalve chest 205, generation of the whirl movement of the refrigerant gas in thevalve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valveshaft inserting hole 207 b and thevalve shaft 206 a of thevalve body 206 is promoted. - It is possible to dispose a
single inlet hole 203 b as shown inFIG. 3 (c) or more than threeinlet holes 203 b instead of disposing a pair of inlet holes 203 b as shown inFIG. 3 (a). - When the
valve chest 205 is provided with a plurality of inlet holes 203 b circumferentially distanced from each other, generation of the whirl movement of the refrigerant gas in thevalve chest 205 is promoted and the prevention of the invasion of small particles of foreign matter into a space between the circumferential wall of the valveshaft inserting hole 207 b and thevalve shaft 206 a of thevalve body 206 is promoted. - It is possible to make the
valve chest 205 truncated-cone-shaped convex toward the other end wall provided with thevalve hole 203 a as shown inFIG. 4 . When thevalve chest 205 is given a truncated-cone-shape convex toward the other end wall provided with thevalve hole 203 a, the flow of the refrigerant gas from the inlet holes 203 b to thevalve hole 203 a at the time when thevalve hole 203 a is opened becomes smooth. Therefore, the small particles of foreign matter are discharged from thevalve chest 205 more easily. - It is possible to extend a
tube member 207 c surrounding the valveshaft inserting hole 207 b from the fixediron core 207 forming the one end wall of thevalve chest 205 toward the other end wall of thevalve chest 205 provided with thevalve hole 203 a beyond the inlet holes 203 b as shown inFIGS. 5 and 6 . - When the
tube member 207 c surrounding the valveshaft inserting hole 207 b extends from the fixediron core 207 forming the one end wall of thevalve chest 205 toward the other end wall of thevalve chest 205 provided with thevalve hole 203 a beyond the inlet holes 203 b, the refrigerant gas entering in thevalve chest 205 through the inlet holes 203 b flows in the annular space between the circumferential wall of thevalve chest 205 and thetube member 207 c. Therefore, generation of the whirl movement of the refrigerant gas is promoted, the whirl flow of the refrigerant gas is prevented from directly contacting the valveshaft inserting hole 207 b, and the prevention of the invasion of small particles of foreign matter into the space between the circumferential wall of the valveshaft inserting hole 207 b and thevalve shaft 206 a of thevalve body 206 is promoted. - The present invention can be widely used for displacement control valves of variable displacement swash plate compressors.
- While the present invention has been described with reference to preferred embodiments, one of ordinary skill in the art will recognize that modifications and improvements may be made while remaining within the spirit and scope of the present invention. The scope of the invention is determined solely by the attached claims.
Claims (6)
1. A displacement control valve of a variable displacement swash plate compressor comprising a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at circumferential wall and a valve hole which is opened and closed by the valve body at the other end wall, wherein the inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor, and wherein the inlet hole is directed at right angle to and located radially offset from the central axis of the valve chest.
2. A displacement control valve of a variable displacement swash plate compressor of claim 1 , wherein the valve chest is provided with a plurality of inlet holes circumferentially distanced from each other.
3. A displacement control valve of a variable displacement swash plate compressor of claim 1 , wherein the inlet hole is directed tangentially to the circumferential wall of the valve chest.
4. A displacement control valve of a variable displacement swash plate compressor of claim 1 , wherein the valve chest has a cylindrical shape.
5. A displacement control valve of a variable displacement swash plate compressor of claim 1 , wherein the valve chest has a truncated-cone-shape convex toward the other end wall.
6. A displacement control valve of a variable displacement swash plate compressor of claim 1 , wherein a tube member surrounding the valve shaft inserting hole extends from the one end wall of the valve chest toward the other end wall of the valve chest beyond the inlet hole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-342083 | 2004-11-26 | ||
JP2004342083A JP4493480B2 (en) | 2004-11-26 | 2004-11-26 | Capacity control valve of variable capacity swash plate compressor |
Publications (1)
Publication Number | Publication Date |
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US20060120883A1 true US20060120883A1 (en) | 2006-06-08 |
Family
ID=36574425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/281,469 Abandoned US20060120883A1 (en) | 2004-11-26 | 2005-11-18 | Displacement control valve of a variable displacement swash plate |
Country Status (2)
Country | Link |
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US (1) | US20060120883A1 (en) |
JP (1) | JP4493480B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160053755A1 (en) * | 2013-03-22 | 2016-02-25 | Sanden Holdings Corporation | Control Valve And Variable Capacity Compressor Provided With Said Control Valve |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5071029B2 (en) * | 2007-10-11 | 2012-11-14 | 株式会社アドヴィックス | Fluid control valve |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5286172A (en) * | 1991-12-26 | 1994-02-15 | Sanden Corporation | Slant plate type compressor with variable capacity control mechanism |
US20020172602A1 (en) * | 2000-11-17 | 2002-11-21 | Tetsuhiko Fukanuma | Variable displacement compressor |
US6902379B2 (en) * | 2002-04-09 | 2005-06-07 | Sanden Corporation | Displacement control valve of variable displacement compressor, compressors including such valves, and methods for manufacturing such compressors |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6469869A (en) * | 1987-09-10 | 1989-03-15 | Nippon Brown Coal Liquefaction | Valve for slurry |
JPH0712279A (en) * | 1993-06-25 | 1995-01-17 | Sekisui Chem Co Ltd | Universal joint draining line |
JP3491598B2 (en) * | 1994-06-17 | 2004-01-26 | 三菱電機株式会社 | Electric flow control valve |
JP3924713B2 (en) * | 2001-11-07 | 2007-06-06 | 株式会社ヴァレオサーマルシステムズ | Control valve for variable displacement compressor |
-
2004
- 2004-11-26 JP JP2004342083A patent/JP4493480B2/en not_active Expired - Fee Related
-
2005
- 2005-11-18 US US11/281,469 patent/US20060120883A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5286172A (en) * | 1991-12-26 | 1994-02-15 | Sanden Corporation | Slant plate type compressor with variable capacity control mechanism |
US20020172602A1 (en) * | 2000-11-17 | 2002-11-21 | Tetsuhiko Fukanuma | Variable displacement compressor |
US6902379B2 (en) * | 2002-04-09 | 2005-06-07 | Sanden Corporation | Displacement control valve of variable displacement compressor, compressors including such valves, and methods for manufacturing such compressors |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160053755A1 (en) * | 2013-03-22 | 2016-02-25 | Sanden Holdings Corporation | Control Valve And Variable Capacity Compressor Provided With Said Control Valve |
Also Published As
Publication number | Publication date |
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JP4493480B2 (en) | 2010-06-30 |
JP2006152861A (en) | 2006-06-15 |
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Owner name: SANDEN CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YUKIHIKO, TAGUCHI;REEL/FRAME:017184/0200 Effective date: 20051017 |
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STCB | Information on status: application discontinuation |
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