JP2004052737A - Control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve capable of controlling the capacity of a compressor with high accuracy. <P>SOLUTION: This control valve 1 is provided with a valve mechanism 7 disposed at the lower part, and a pressure sensitive mechanism 8 disposed at the upper part. The pressure sensitive mechanism 8 is provided with a pressure sensitive chamber 34 into which inlet pressure Ps is taken, and a regulating chamber 35 defined by a housing 10 and a diaphragm 30. The regulating chamber 35 is held to reference pressure (preferably vacuum). The diaphragm 30 is displaced according to the differential pressure between the inlet pressure Ps in the pressure sensitive chamber 34 and pressure in the regulating chamber 35, and the displacement of the diaphragm 30 is transmitted to a valve element 14 through a rod 16 to regulate the opening of a valve hole 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control valve for controlling the capacity of a variable capacity compressor used in, for example, a vehicle air conditioner.
[0002]
[Prior art]
A general variable capacity compressor used in a refrigerant circuit includes a crank chamber, a tiltable swash plate provided in the crank chamber, and a piston reciprocated by the swash plate. The inclination angle of the swash plate changes according to the pressure in the crank chamber (crank pressure). The piston moves with a stroke corresponding to the inclination angle of the swash plate. The capacity of the compressor changes according to the stroke of the piston.
In order to adjust the crank pressure, the compressor is provided with a control valve. This control valve is provided, for example, in the middle of a gas supply passage that connects a discharge chamber of the compressor to the crank chamber. The control valve adjusts the amount of refrigerant gas supplied from the discharge chamber to the crank chamber through the gas supply passage according to the pressure (intake pressure) of the refrigerant gas drawn into the compressor from the evaporator provided in the refrigerant circuit. To do.
[0003]
FIG. 3 shows an example of a conventional capacity control valve. A valve chamber 102 is provided below the valve housing 101 of the control valve. The valve chamber 102 is connected to a discharge chamber 142 of the compressor through an upstream portion of a gas supply passage 143 formed in the compressor. The valve chamber 102 is also connected to the crank chamber 140 of the compressor through the valve hole 103 and the downstream portion of the gas supply passage 143. The spherical valve body 104 is accommodated in the valve chamber 102 and is urged toward the valve hole 103 by a spring 105.
A pressure sensitive mechanism 108 is provided on the upper portion of the valve housing 101. The pressure-sensitive mechanism 108 includes a regulation chamber 110 and a pressure-sensitive chamber 111 that are partitioned by a resin or metal diaphragm 109. The pressure sensing chamber 111 is connected to the compressor suction chamber 141 through the pressure detection passage 144. The valve housing 101 is provided with a rod hole 112 having a circular cross section that forms a pressure sensitive chamber 111.
[0004]
The pressure sensitive mechanism 108 includes a cylindrical case 115 that defines the adjustment chamber 110. The cylindrical case 115 is fixed on the valve housing 101. The diaphragm 109 is sandwiched between the cylindrical case 115 and the valve housing 101.
The rod hole 112 is connected to the valve hole 103 through a communication hole 116 formed in the valve housing 101. The axially movable rod 117 is accommodated in the rod hole 112, and the tip of the rod 117 extends to the valve hole 103 through the communication hole 116. The spring 105 in the valve chamber 102 urges the valve body 104 so as to press the valve body 104 against the lower end surface of the rod 117.
A spring 119 disposed in the pressure sensing chamber 111 urges the diaphragm 109 through the rod 117 upward in FIG.
[0005]
The adjustment chamber 110 is provided with an adjustment spring 125. The adjustment spring 125 urges the diaphragm 109 downward in FIG. The adjusting body 127 is screwed to the cylindrical case 115 so as to be movable in the axial direction. The adjustment body 127 receives the adjustment spring 125 via the abutment 128. The force by which the adjustment spring 125 biases the diaphragm 109 is changed according to the axial position of the adjustment body 127 with respect to the cylindrical case 115.
A suction pressure Ps is introduced into the pressure sensing chamber 111 from the suction chamber 141 through the pressure detection passage 144. The diaphragm 109 is displaced according to the suction pressure Ps in the pressure sensitive chamber 111. The displacement of the diaphragm 109 is transmitted to the valve body 104 through the rod 117. Therefore, the valve body 104 is moved by the diaphragm 109 so as to adjust the opening degree of the valve hole 103 in accordance with the suction pressure Ps in the pressure sensing chamber 111. The amount of refrigerant gas supplied from the discharge chamber 142 to the crank chamber 140 through the gas supply passage 143 is adjusted according to the opening of the valve hole 103. The crank pressure Pc changes according to the amount of refrigerant gas supplied to the crank chamber 140, and the inclination angle of the swash plate of the compressor is changed accordingly. As a result, the capacity of the compressor is adjusted so that the suction pressure Ps converges to a predetermined target value (target suction pressure).
[0006]
The biasing force of the adjustment spring 125 reflects the target suction pressure. At the time of manufacturing the control valve, by adjusting the axial position of the adjusting body 127 with respect to the cylindrical case 115, the biasing force of the adjusting spring 125, in other words, the target suction pressure is determined. The control valve operates so that the suction pressure Ps converges to the target suction pressure set by the regulator 127.
[0007]
[Problems to be solved by the invention]
In the case of such a control valve, the diaphragm is deflected in accordance with the suction pressure, and the deflection is transmitted to the valve body that opens and closes the valve hole. Since the relationship between the amount of deflection of the diaphragm and the suction pressure is not a proportional relationship, in order to make the operation characteristic of the control valve a desired characteristic, for example, the pressure of the control chamber with respect to the suction pressure Ps needs to be constant.
However, the control chamber 110 of the control valve is controlled at atmospheric pressure. The atmospheric pressure in the control chamber 110 changes depending on, for example, the date and time, the weather, and the like. Therefore, when the compressor is controlled, an error due to the atmospheric pressure is generated, and there is a problem that the control accuracy of the control valve is lowered.
The objective of this invention is providing the control valve which can control the capacity | capacitance of a compressor with high precision.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to a suction pressure region exposed to the suction pressure, a discharge pressure region exposed to the discharge pressure, and a gas supply passage connecting the crank chamber to the discharge pressure region. A control valve for adjusting the pressure in the crank chamber to change the capacity of the variable displacement compressor provided with a valve housing provided in the middle of the gas supply passage, and adjusting the opening of the gas supply passage Therefore, it is a pressure sensing mechanism having a valve body provided in the valve housing, a regulation chamber and a pressure sensing chamber partitioned by a diaphragm, and the suction pressure in the suction pressure region is introduced into the pressure sensing chamber. The diaphragm is displaced according to the suction pressure in the pressure-sensitive chamber, and the rod extending in the valve housing is interposed between the diaphragm and the diaphragm so as to transmit the displacement of the diaphragm to the valve body. And a biasing means for biasing the metal and the rod toward the diaphragm so that the diaphragm is sandwiched between the metal and the rod, The adjustment chamber is maintained at a vacuum or a reference pressure.
[0009]
According to a second aspect of the present invention, in the control valve according to the first aspect, the upper case has a hole for welding a sealing body at the top thereof, and the control chamber is evacuated or supplied with a reference pressure through the hole. The sealed body was fixed to the hole while being held in the hole.
According to a third aspect of the present invention, in the control valve according to the first or second aspect, a positioning portion for supporting and positioning the diaphragm is formed at an end of the lower case on the pressure-sensitive mechanism side.
According to a fourth aspect of the present invention, in the control valve according to any one of the first to third aspects, the pressure-sensitive mechanism includes an adjuster for adjusting a biasing force of the spring.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIG.
A displacement control valve (hereinafter simply referred to as a control valve) 1 shown in FIG. 1 is mounted on a variable displacement compressor incorporated in a refrigerant circuit. Although the detailed configuration of the variable displacement compressor is not particularly illustrated, the compressor has a crank chamber 2 exposed to the crank pressure Pc, a suction chamber (suction pressure region) 3 exposed to the suction pressure Ps, and a discharge. And a discharge chamber (discharge pressure region) 4 exposed to the pressure Pd. A tiltable swash plate is provided in the crank chamber 2. When the drive shaft of the compressor rotates, the piston is reciprocated by the swash plate. The piston sucks the refrigerant gas introduced into the suction chamber 3 from an evaporator provided in the refrigerant circuit into the cylinder bore. The piston further compresses the refrigerant gas in the cylinder bore and discharges the compressed refrigerant gas into the discharge chamber 4. The compressed refrigerant gas in the discharge chamber 4 is sent out to the refrigerant circuit.
[0011]
The compressor also includes a gas supply passage 5 that connects the discharge chamber 4 to the crank chamber 2. The control valve 1 is provided in the middle of the gas supply passage 5. The control valve 1 adjusts the amount of refrigerant gas supplied from the discharge chamber 4 to the crank chamber 2 through the gas supply passage 5 according to the suction pressure Ps introduced from the suction chamber 3 through the pressure detection passage 6.
The control valve 1 has a valve mechanism 7 formed in the lower part and a pressure-sensitive mechanism 8 formed in the upper part. The control valve 1 has a valve housing 9 as a lower case and a case 10 as an upper case. The valve mechanism 7 is formed in the lower part of the valve housing 9, and the pressure sensitive mechanism 8 is formed in the upper part of the valve housing 9 and the case 10.
[0012]
First, the valve mechanism 7 will be described.
A valve chamber 11 is provided below the valve housing 9. The valve chamber 11 is connected to the discharge chamber 4 through the upstream portion of the gas supply passage 5. The valve housing 9 has a valve hole 12 that opens to the top surface 11 a of the valve chamber 11 and a port 13 that communicates with the valve hole 12.
The valve hole 12 is connected to the crank chamber 2 through the port 13 and the downstream portion of the gas supply passage 5. The valve chamber 11, the valve hole 12, and the port 13 are internal passages provided in the valve housing 9 so as to form a part of the gas supply passage 5.
A spherical valve body 14 and a spring 15 are accommodated in the valve chamber 11. The spring 15 is disposed in the valve chamber 11 and biases the valve body 14 toward the valve hole 12. A spring receiver 17 that receives a spring 15 is provided in the valve chamber 11. The spring receiver 17 has a gas flow hole 18 that allows the valve chamber 11 to communicate with the upstream portion of the gas supply passage 5. A filter 19 is attached to the inlet of the gas circulation hole 18.
[0013]
A pressure sensitive mechanism 8 is provided on the upper portion of the valve housing 9. The pressure-sensitive mechanism 8 includes a pressure-sensitive member, that is, a diaphragm 30, and a pressure-sensitive chamber 34 and a regulation chamber 35 that are partitioned by the pressure-sensitive member 8. The diaphragm 30 is made of, for example, a resin material or a metal material.
The valve housing 9 is provided with a rod hole 40 having a circular cross section that forms a pressure sensitive chamber 34. The rod hole 40 extends along the axial direction of the valve housing 9 and is opened upward (upward in FIG. 1) of the valve housing 9. An annular groove 61 is formed on the upper end surface of the valve housing 9 so as to be located around the opening of the rod hole 40. A seal ring 64 is attached to the annular groove 61.
[0014]
The pressure-sensitive mechanism 8 also includes a cylindrical case 10 that defines the adjustment chamber 35, and a ring member 62 that holds the diaphragm 30 together with the case 10. The case 10 opens downward, and a flange 70 as an outer edge portion is integrally formed at the lower end of the case 10. The ring member 62 is formed in an annular shape substantially the same as the flange 70. The flange 70 and the ring member 62 of the case 10 are welded to the outer periphery of the flange 70 and the ring member 62 (for example, plasma welding, laser welding, etc.) with the diaphragm 30 held between the flange 70 and the ring member 62 of the case 10. , Or beam welding).
The integrated case 10, diaphragm 30 and ring member 62 are arranged on the valve housing 9 via a seal ring 64 so that the diaphragm 30 closes the opening of the rod hole 40. Then, by crimping the upper end of the valve housing 9, the pressure sensitive mechanism 8 (adjustment chamber 35) is fixed to the valve housing 9.
[0015]
The valve housing 9 has a positioning surface 63 as a positioning portion for supporting the ring member 62 and an engaging claw 65 for fixing the case 10 (adjustment chamber 35). The positioning surface 63 is formed so that the distance A between the diaphragm 30 and the top surface 11a of the valve chamber 11 becomes a predetermined value. The engagement claw 65 strengthens the connection between the case 10 (the adjustment chamber 35) and the valve housing 9. The engaging claw 65 is engaged with the flange 70 of the case 10 with the ring member 62 in contact with the positioning surface 63. At this time, the lower end of the ring member 62 is preferably separated from the valve housing 9.
Here, the positioning surface 63 and the top surface 11a will be described. The amount of deflection of the diaphragm 30 is related to the valve opening pressure of the control valve 1. Further, the repulsive force of the diaphragm 30 changes not in a linear manner but in a curved manner with respect to the deflection amount. Therefore, the initial deflection amount of the diaphragm 30 should be adjusted strictly. In the present embodiment, the distance A between the top surface 11a and the positioning surface 63 is set so that the distance between the diaphragm 30 and the valve hole 12 becomes a predetermined distance when the case 10 and the valve housing 9 are welded. Yes.
[0016]
The inside of the adjustment chamber 35 is maintained at a predetermined reference pressure (preferably vacuum). The case 10 has a top hole 72, that is, a pressure setting hole at the top thereof. The top hole 72 is closed by a sealing body 73. The top hole 72 is preferably circular, and the sealing body 73 is preferably spherical.
In the adjustment chamber 35, the adjuster 31, the abutment 32, and an adjustment spring 33 as an urging means are arranged. An engagement groove 74 is formed on the outer surface of the adjuster 31, and an engagement protrusion 75 protruding inward is formed on the case 10. The engaging protrusion 75 of the case 10 is formed by caulking, and the adjuster 31 is fixed to the case 10 by engaging the engaging groove 74 of the adjuster 31 with the engaging protrusion 75. A through hole 76 is formed in the center of the adjuster 31 so as to penetrate vertically.
[0017]
Further, a cylindrical fitting convex portion 77 is formed on the lower surface of the adjuster 31. A cylindrical fitting projection 78 is also formed on the upper surface of the metal 32. The upper end of the adjustment spring 33 is fitted to the fitting convex portion 77 of the adjuster 31 so as to be positioned with respect to the adjuster 31. Similarly, the lower end of the adjustment spring 33 is fitted to the fitting convex part 78 of the winning metal 32 so that the lower end of the adjusting spring 33 is positioned with respect to the winning metal 32. The adjustment spring 33 has an outer diameter set to be substantially the same as the inner diameter of the case 10 and slides on the inner peripheral surface of the case 10 along the axial direction.
Depending on the axial position of the adjuster 31 in the case 10, the force (biasing force) for biasing the diaphragm 30 by the adjustment spring 33 is changed, and the characteristics of the control valve 1 are adjusted. Specifically, at the time of manufacturing the pressure-sensitive mechanism 8, the case 10 is crimped after a tool is inserted from the top hole 72 and the position of the adjuster 31 is adjusted. Due to the caulking process, the case 10 protrudes inward to form an engaging protrusion 75, and the engaging protrusion 75 is engaged with the engaging groove 74 of the adjuster 31. Thereby, the length, that is, the urging force of the adjustment spring 33 is adjusted, and the control valve 1 is adjusted to have a desired characteristic.
[0018]
After the adjuster 31 is fixed, the pressure-sensitive mechanism 8 is disposed in a predetermined reference pressure atmosphere. For example, the pressure sensitive mechanism 8 is disposed in a pressure chamber of a reference pressure (preferably vacuum). Via the top hole 72 and the through hole 76, the pressure in the adjustment chamber 35 is balanced with the pressure in the pressure chamber smoothly, and the pressure in the adjustment chamber 35 is set to the reference pressure. In this state, the top hole 72 is closed by the sealing body 73. By welding the sealing body 73 to the case 10, the adjustment chamber 35 is sealed.
Further, the case 10 has a stepped portion 71 between the flange 70 and the cylindrical portion. The stepped portion 71 is in contact with the peripheral edge of the gold 32 and restricts the movement of the gold 32 upward.
[0019]
The rod hole 40 includes a large-diameter portion 41 positioned closer to the opening of the rod hole 40, a medium-diameter portion 42 positioned in the axially intermediate portion of the rod hole 40, and a small-diameter portion positioned deep in the rod hole 40. 43. The valve housing 9 includes a partition wall 44 provided between the small diameter portion 43 and the valve hole 12. The partition wall 44 has a communication hole 45 that allows the small diameter portion 43 to communicate with the valve hole 12.
The rod 16 is inserted into the rod hole 40, the communication hole 45, and the valve hole 12 so as to be movable in the axial direction with respect to the valve housing 9. The rod 16 includes a large diameter portion 46, a medium diameter portion 47, a small diameter portion 48, and a flange portion 49.
The large diameter portion 46 of the rod 16 is inserted through the large diameter portion 41 and the medium diameter portion 42 of the rod hole 40. The diameter of the large diameter portion 46 of the rod 16 is substantially the same as or slightly smaller than the diameter of the medium diameter portion 42 of the rod hole 40. The pressure sensing chamber 34 is formed between the large diameter portion 46 of the rod 16 and the large diameter portion 41 of the rod hole 40.
An annular groove 50 and a long groove 51 are formed on the outer peripheral surface of the large-diameter portion 46 of the rod 16. The long groove 51 extends along the axis of the rod 16 so that the pressure sensitive chamber 34 communicates with the annular groove 50. The annular groove 50 is connected to the pressure detection passage 6 through a port 52 formed in the valve housing 9. Accordingly, the suction pressure Ps of the suction chamber 3 is introduced into the pressure sensing chamber 34 through the pressure detection passage 6, the port 52, the annular groove 50 and the long groove 51.
[0020]
The medium-diameter portion 47 of the rod 16 is formed at the tip of the rod 16 on the large-diameter portion 46 side (the upper side in FIG. 1). The diameter of the medium diameter portion 47 of the rod 16 is smaller than the diameter of the large diameter portion 46 of the rod 16. The middle diameter portion 47 supports the substantially central portion of the diaphragm 30 on its upper surface (upper side in FIG. 1).
Between the large diameter portion 46 and the medium diameter portion 47 of the rod 16, a flange portion 49 protruding outward in the radial direction of the rod 16 is formed. The diameter of the flange portion 49 is formed larger than the diameter of the large diameter portion 46 of the rod 16.
A spring 53 as an urging means is disposed in the pressure sensitive chamber 34. The upper end of the spring 53 is engaged with the flange portion 49 of the rod 16. The lower end of the spring 53 is engaged with a step 54 between the large diameter part 41 and the medium diameter part 42 of the rod hole 40. The spring 53 urges the diaphragm 30 through the rod 16 upward in FIG.
The small diameter portion 48 of the rod 16 extends downward from the lower end of the large diameter portion 46 in FIG. 1 and reaches the valve hole 12 through the communication hole 45. A spring 15 as a biasing means provided in the valve chamber 11 biases the valve body 14 so as to press the valve body 14 against the lower end of the small diameter portion 48.
[0021]
As shown in FIG. 2, a mortar-shaped inclined surface 55 is formed at the periphery on the upper side (upper side in FIG. 1) of the communication hole 45, in other words, at the corner between the upper surface of the partition wall 44 and the communication hole 45. Yes. The inclined surface 55 gradually becomes smaller in diameter from the rod hole 40 toward the valve hole 12.
A bush 56 having a substantially cylindrical shape is press-fitted into the small diameter portion 43 of the rod hole 40. The bush 56 has an insertion hole 57 that allows the small diameter portion 48 of the rod 16 to pass therethrough. The bush 56 also has a tapered surface 58 corresponding to the inclined surface 55.
A donut plate-like seal plate 59 is sandwiched and fixed between the bush 56 and the partition wall 44. The seal plate 59 has an insertion hole 60 that allows the small diameter portion 48 of the rod 16 to pass therethrough. The seal plate 59 is made of an elastic resin material and has a substantially flat plate shape before being attached to the control valve 1. When the seal plate 59 is sandwiched between the inclined surface 55 of the partition wall 44 and the tapered surface 58 of the bush 56, the seal plate 59 is bent along the surfaces 55 and 58 in a tapered shape. In a state where the rod 16 is assembled to the control valve 1, the inner peripheral edge of the seal plate 59 is brought into close contact with the small diameter portion 48 by the elastic force of the seal plate 59.
[0022]
Positioning means 20 for positioning the valve body 14 and the rod 16 with each other is provided between the valve body 14 and the rod 16. Specifically, as shown in FIG. 2, a conical positioning recess 22 is formed on the lower end surface of the rod 16. The valve body 14 is engaged with a positioning recess 22 on the lower end surface of the rod 16.
Next, the operation of the control valve 1 configured as described above will be described.
The suction pressure Ps of the suction chamber 3 is introduced into the pressure sensing chamber 34 through the pressure detection passage 6. The diaphragm 30 is displaced according to the suction pressure Ps in the pressure sensitive chamber 34. The displacement of the diaphragm 30 is transmitted to the valve body 14 through the rod 16. Accordingly, the valve body 14 is moved by the diaphragm 30 so as to adjust the opening degree of the valve hole 12 according to the suction pressure Ps in the pressure sensing chamber 34. The amount of refrigerant gas supplied from the discharge chamber 4 to the crank chamber 2 through the gas supply passage 5 is adjusted according to the opening of the valve hole 12.
For example, when the cooling load applied to the refrigerant circuit decreases, the pressure of the refrigerant gas introduced from the evaporator into the suction chamber 3, that is, the suction pressure Ps decreases. Then, the diaphragm 30 is displaced so as to move the valve body 14 downward in FIG. 1, and the opening degree of the valve hole 12 is increased. Therefore, the amount of refrigerant gas supplied from the discharge chamber 4 to the crank chamber 2 increases, and the crank pressure Pc increases. As a result, the inclination angle of the swash plate of the compressor is reduced, and the capacity of the compressor is reduced.
[0023]
Conversely, when the cooling load on the refrigerant circuit increases, the suction pressure Ps increases. Then, the diaphragm 30 is displaced so as to move the valve body 14 upward in FIG. 1, and the opening degree of the valve hole 12 is reduced. Therefore, the amount of refrigerant gas supplied from the discharge chamber 4 to the crank chamber 2 decreases, and the crank pressure Pc decreases. As a result, the inclination angle of the swash plate of the compressor increases and the capacity of the compressor increases.
The biasing force of the adjustment spring 33 reflects the target value (target suction pressure) of the suction pressure Ps. During the manufacture of the control valve 1, the biasing force of the adjustment spring 33, in other words, the target suction pressure, is determined by adjusting the axial position of the adjuster 31 with respect to the case 10. The control valve 1 controls the capacity of the compressor so that the actual suction pressure Ps converges to the target suction pressure set by the adjuster 31.
In addition, a stepped portion 71 that can contact the metal 32 is formed on the inner surface of the case 10. The abutment 32 is prevented from moving further upward by contacting the stepped portion 71. Therefore, even if the suction pressure Ps rises excessively, the stepped portion 71 receives the metal 32, thereby preventing the diaphragm 30 from being deformed excessively.
[0024]
Further, the adjustment spring 33 slides on the inner peripheral surface of the case 10. The abutment 32 is positioned in the radial direction with respect to the diaphragm 30 by the adjustment spring 33 sliding along the inner circumferential surface of the case 10 along the axial direction.
As described above, according to the present embodiment, the following operations and effects are achieved.
The inside of the adjustment chamber 35 of the control valve 1 is held at a reference pressure (preferably vacuum). Therefore, the control valve 1 can satisfactorily control the compressor even if the measurement conditions (for example, atmospheric pressure) change.
The positioning surface 63 and the top surface 11a are set to have a distance A so that the distance between the diaphragm 30 and the valve hole 12 becomes a predetermined value by the contact between the positioning surface 63 and the ring member 62. In this way, the initial deflection amount of the diaphragm 30 matches the design value. Therefore, setting of the characteristics of the control valve 1 is easy, and the accuracy of the control valve 1 is improved.
[0025]
As the peripheral edge of the metal 32 comes into contact with the stepped portion 71 of the case 10, the upward displacement of the diaphragm 30 is restricted. Therefore, even when the suction pressure Ps is abnormally high, the diaphragm 30 is reliably prevented from being displaced more than necessary, so that the durability of the diaphragm 30 can be further enhanced.
The adjustment spring 33 slides on the inner peripheral surface of the case 10 along the axial direction. Therefore, the abutment 32 is positioned in the radial direction with respect to the diaphragm 30 by the adjustment spring 33 sliding on the inner peripheral surface of the case 10, and the accuracy of the control valve 1 can be improved.
Since the valve body 14 is engaged with the positioning recess 22 of the rod 16, the valve body 14 is reliably positioned with respect to the rod 16 and is not displaced with respect to the rod 16. That is, the valve body 14 is not displaced in the direction perpendicular to the axial direction of the control valve 1 with respect to the rod 16. Therefore, there is no possibility that the valve body 14 contacts the inner wall of the valve housing 9 that defines the valve chamber 11, and the control valve 1 operates well according to the pressure in the pressure sensing chamber 34.
[0026]
The embodiment of the present invention is not limited to the above, and may be appropriately changed as follows without departing from the spirit of the present invention.
Any configuration may be employed as long as the positioning means can prevent the displacement of the valve element 14 with respect to the rod 16.
The shape and size of the positioning recess 22 of the rod 16 are not limited to those shown in the drawings, and may be changed as appropriate.
Contrary to FIG. 1, the valve hole 12 may be connected to the discharge chamber 4 through the upstream portion of the gas supply passage 5, and the valve chamber 11 may be connected to the crank chamber 2 through the downstream portion of the gas supply passage 5.
[0027]
The technical idea grasped from the above embodiment will be described.
(1) The valve body is pressed against the rod by the biasing means, and positioning means for positioning the valve body and the rod relative to each other is provided between the valve body and the rod. The control valve according to any one of claims 1 to 4.
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a control valve capable of controlling the capacity of the compressor with high accuracy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a control valve according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of positioning means.
FIG. 3 is a cross-sectional view of a conventional control valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Control valve, 2 ... Crank chamber, 3 ... Intake chamber, 4 ... Discharge chamber, 5 ... Gas supply passage, 6 ... Pressure detection passage, 7 ... Valve mechanism, 8 ... Pressure sensing mechanism, 9 ... Valve as lower case Housing 90: Case as upper case, 11 ... Valve chamber, 12 ... Valve hole, 11a ... Top surface, 16 ... Rod, 30 ... Diaphragm, 31 ... Adjuster, 32 ... Gold, 33 ... Adjusting spring, 34 ... Pressure sensitive Chamber 35 ... Adjusting chamber 40 ... Rod hole 53 ... Spring 62 ... Ring member as outer edge 63 ... Positioning surface 70 ... Flange as outer edge 72 ... Top hole 73 ... Sealing body 76 ... Through hole, A ... distance, Pd ... discharge pressure, Ps ... suction pressure.

Claims (4)

In order to change the capacity of the variable capacity compressor having a suction pressure region exposed to the suction pressure, a discharge pressure region exposed to the discharge pressure, and a gas supply passage connecting the crank chamber to the discharge pressure region. A control valve for adjusting pressure,
A valve housing provided in the middle of the gas supply passage;
A valve body provided in the valve housing to adjust the opening of the gas supply passage;
A pressure sensing mechanism having a regulation chamber and a pressure sensing chamber partitioned by a diaphragm, wherein the suction pressure in the suction pressure region is introduced into the pressure sensing chamber, the regulation chamber is maintained at a vacuum or a reference pressure, and the diaphragm is Displaces according to the suction pressure in the pressure sensitive chamber,
A rod extending through the valve housing to transmit displacement of the diaphragm to the valve body;
A gold disposed on the opposite side of the rod across the diaphragm;
A control valve comprising biasing means for biasing the metal and the rod toward the diaphragm so that the diaphragm is sandwiched between the metal and the rod. It has a case with a hole for welding the sealing body to the top,
The control valve according to claim 1, wherein a sealing body is fixed to the hole in a state where the adjustment chamber is maintained at a vacuum or a reference pressure through the hole. The control valve according to claim 1 or 2, wherein a positioning portion for supporting and positioning the diaphragm is formed at an end of the valve housing on the pressure-sensitive mechanism side. 4. The pressure sensitive mechanism according to claim 1, further comprising an adjuster for adjusting a biasing force of the biasing means that biases the metal toward the diaphragm. The control valve described.

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