JP2010133331A - Control valve for compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve for a compressor, in which the need of an O-ring for preventing entrance of foreign matter is eliminated, and which is not susceptible to being damaged in press-fitting. <P>SOLUTION: The control valve 45 for a compressor includes: a control valve body part 46 having a valve element; and a connector part 66 connected to the control valve body part 46. The connector part 66 is made from resin material, and has a projection 68 annularly formed in a circumferential direction of an outer peripheral surface 66B of the connector part 66. The control valve 45 is press-fitted through the projection 68, and the connector part 66 after the press-fitting faces an atmospheric-pressure atmosphere. In the control valve 45 in the press-fitted state, the projection 68 made from resin material functions as a sealing member for preventing entrance of the foreign matter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control valve for a compressor.

As a conventional control valve for a compressor, for example, a capacity control valve provided in a swash plate type variable displacement compressor is widely known.
The capacity control valve is a control valve provided in an air supply passage connecting the discharge chamber and the crank chamber, and is a control valve that controls the flow rate of the refrigerant gas at the discharge pressure supplied to the crank chamber.
Among the capacity control valves, a capacity control valve that is externally controlled includes an electromagnetic solenoid.
The external control type capacity control valve is press-fitted into a valve installation hole formed in the housing of the compressor and fixed to the housing.
Some capacity control valves include a control valve body having a valve body and a resin connector connected to the control valve body.

For example, the control valve main body includes a member formed of an iron-based material, such as an electromagnetic solenoid cover.
If foreign matter such as salt water enters the valve installation hole in a state where the capacity control valve is press-fitted into the valve installation hole, the member made of iron-based material is corroded.
Therefore, in this type of capacity control valve, there is a case where an O-ring as a seal member for preventing foreign matter from entering the valve installation hole from the outside is mounted.
In this case, an O-ring mounting groove is formed on the outer peripheral surface of the connector portion, and the O-ring is mounted in this mounting groove.
This O-ring prevents foreign matter from entering the valve installation hole as a sealing member.
Accordingly, the entry of foreign matter into the valve installation hole is prevented, so that corrosion of the member formed of the iron-based material can be avoided.

By the way, as another prior art related to the control valve, for example, there is an exhaust gas recirculation control valve disclosed in Patent Document 1.
In this control valve, the valve seat member is formed in a thin cup shape.
A first orifice and a valve seat connected to the first orifice are provided on the bottom surface of the cup, and a second orifice is provided on the side surface of the cup.
The valve seat member is press-fitted into a passage hole of the valve body and fixed to the valve body.
A ring-shaped protrusion is provided in the passage hole of the valve body.
In a state in which the valve seat member is press-fitted, the protrusion is slightly elastically deformed and is in close contact with the entire side surface of the valve seat member.
Therefore, the protrusion functions as a gas seal, and gas leakage from between the valve body and the valve seat member can be suppressed small.
Japanese Patent Laid-Open No. 10-169515

However, when an O-ring is provided in the connector part of the capacity control valve, it is necessary to form a mounting groove for mounting the O-ring in the connector part.
When an O-ring is used to prevent foreign matter from entering, the mounting groove for mounting the O-ring becomes a factor for reducing the strength of the connector portion, and measures such as increasing the length of the connector portion are necessary to ensure the strength.
In addition, since the O-ring is used as the seal member, the number of parts is increased and an operation for mounting the O-ring is required.

When the control valve disclosed in Patent Document 1 is applied to a displacement control valve, the following problems can be considered although foreign substances can be prevented from entering the valve installation hole.
When a protrusion is provided on the inner peripheral surface of the valve installation hole formed in the compressor housing, the protrusion provided on the inner peripheral surface contacts the control valve main body when the control valve is press-fitted into the valve installation hole. The control valve main body may be damaged.
Normally, the housing is formed of a metal material, and when the clearance between the control valve and the inner peripheral surface of the valve installation hole is small and the coaxiality of both is required to be high, the control valve body by contact with the projection The possibility of damage to the parts is high.

  An object of the present invention is to provide a control valve for a compressor that eliminates the need for an O-ring for preventing entry of foreign matter and is not easily damaged during press-fitting. .

  In order to achieve the above-mentioned object, the present invention provides a control valve for a compressor including a control valve main body portion provided with a valve body and a connector portion connected to the control valve main body portion. The protrusion is formed of a material and formed annularly in the circumferential direction of the outer peripheral surface of the connector portion, the control valve is press-fitted through the protrusion, and the connector portion after press-fitting is exposed to an atmospheric pressure atmosphere. It is characterized by that.

According to the present invention, in the press-fitted control valve, the protrusion formed in an annular shape by the resin material on the outer peripheral surface of the connector portion functions as a sealing member for preventing foreign matters from being mixed. There is no need to use an O-ring to prevent contamination.
Further, since the protrusion is formed in an annular shape along the circumferential direction of the outer peripheral surface of the connector portion, the protrusion serves as a seal member and contributes to an improvement in the strength of the connector portion.
In addition, since the annular protrusion is formed in the circumferential direction of the outer peripheral surface of the connector part, the control valve main body part and the connector part are less likely to come into contact with the press-fitting destination when the control valve is press-fitted. And damage to the connector can be avoided.
Since the protrusion only needs to fulfill the function of preventing the entry of foreign matter and the function of improving the strength of the connector portion, the protrusion can be made of a resin material.

According to the present invention, in the control valve for a compressor described above, the control valve main body portion may include an electromagnetic solenoid, and the connector portion may be connected to the electromagnetic solenoid.
In this case, the electromagnetic solenoid and the connector portion are connected, but foreign matters can be prevented from entering the electromagnetic solenoid side by using the protrusion formed on the connector portion.

In the present invention, in the above control valve for a compressor, the protrusion may have an inclined surface facing the press-fitting direction.
In this case, the frictional resistance at the time of press-fitting the control valve can be suppressed, and the control valve can be easily press-fitted.

  According to the present invention, it is possible to provide a control valve for a compressor that eliminates the need for an O-ring for preventing the entry of foreign matter and is not easily damaged during press-fitting.

Hereinafter, a control valve for a compressor according to an embodiment of the present invention will be described with reference to the drawings.
The compressor shown in FIG. 1 is a swash plate type variable displacement compressor, and includes a control valve according to the present invention.
In FIG. 1, the left side is the front and the right side is the rear.

The housing of the compressor 10 is formed of a cylinder block 12, a front housing 13 joined to the front end of the cylinder block 12, and a rear housing 14 joined to the rear end of the cylinder block 12.
A crank chamber 15 is formed in the housing 11 by joining the cylinder block 12 and the front housing 13.
A drive shaft 16 is rotatably disposed in the crank chamber 15.
The drive shaft 16 is operatively connected to an engine 17 as an external drive source mounted on the vehicle, and is driven to rotate by receiving power transmission from the engine 17.
The compressor of this embodiment employs a configuration in which the power of the engine 17 is always transmitted to the drive shaft 16, and is a clutchless type compressor.

In the crank chamber 15, a lug plate 18 is fixed to the drive shaft 16 so as to be integrally rotatable.
A swash plate 19 is accommodated in the crank chamber 15.
The swash plate 19 is fitted to the drive shaft 16 at a set inclination angle, is tiltable in the axial direction of the drive shaft 16, and is supported so as to be slidable in the axial direction with respect to the drive shaft 16. Yes.
A hinge mechanism 20 is interposed between the lug plate 18 and the swash plate 19.
The hinge mechanism 20 has a function of rotating the lug plate 18 and the drive shaft 16 synchronously and allowing the swash plate 19 to tilt with respect to the axial direction of the drive shaft 16.

A plurality (only one is shown in FIG. 1) of cylinder bores 21 is formed in the cylinder block 12.
A single-headed piston 22 is accommodated in each cylinder bore 21 so as to be able to reciprocate.
Each piston 22 is anchored to the outer periphery of the swash plate 19 via a shoe 23.
A valve / port forming body 24 is interposed between the cylinder block 12 and the rear housing 14.
A compression chamber 25 surrounded by a piston 22 and a valve / port formation body 24 is defined on the back side (rear side in FIG. 1) of the cylinder bore 21.

Since the valve / port forming body 24 is interposed between the cylinder block 12 and the rear housing 14, a suction chamber 26 and a discharge chamber 27 are defined in the rear housing 14.
The valve / port forming body 24 includes a suction port 28 that communicates the suction chamber 26 and the compression chamber 25, a suction valve 29 that opens and closes the suction port 28, a discharge port 30 that communicates the discharge chamber 27 and the compression chamber 25, and a discharge A discharge valve 31 for opening and closing the port 30 is formed.
As shown in FIG. 1, a partition wall 14 </ b> A formed in the rear housing 14 separates both chambers 26 and 27.

The rear housing 14 is formed with a suction port 32 connected to the external refrigerant circuit 35, and the suction port 32 and the suction chamber 26 are communicated with each other through a suction passage 33.
A discharge passage 34 through which the refrigerant gas from the discharge chamber 27 passes is formed in the rear housing 14.
The discharge passage 34 is connected to an external refrigerant circuit 35.

The refrigerant circuit (refrigeration cycle) of the vehicle air conditioner includes a compressor 10 as a part of the refrigerant circuit, and an external refrigerant circuit 35 connected to the discharge chamber 27 and the suction chamber 26 of the compressor. .
For example, carbon dioxide or chlorofluorocarbon is used as the refrigerant.
The external refrigerant circuit 35 includes a heat exchanger 36, an expansion valve 37, and a heat exchanger 38 in order from the discharge chamber 27 side.

By the way, the cylinder block 12 is formed with an extraction passage 41 that allows the crank chamber 15 and the suction chamber 26 to communicate with each other.
The extraction passage 41 is a passage for releasing the pressure in the crank chamber 15 to the suction chamber 26.
An air supply passage 42 that communicates the discharge chamber 27 and the crank chamber 15 is formed across the cylinder block 12 and the rear housing 14.
The air supply passage 42 is a passage for supplying the pressure of the discharge chamber 27 to the crank chamber 15.
In the rear housing 14, a capacity control valve 45 is disposed midway in the air supply passage 42.

By adjusting the opening of the capacity control valve 45, the amount of high-pressure refrigerant gas introduced into the crank chamber 15 through the air supply passage 42 and the refrigerant gas derived from the crank chamber 15 through the extraction passage 41 are extracted. The balance with the amount is controlled, and the internal pressure of the crank chamber 15 is determined.
The difference from the internal pressure in the cylinder bore 21 via the piston 22 is changed according to the internal pressure in the crank chamber 15, and the inclination angle of the swash plate 19 with respect to the drive shaft 16 is changed.
As a result, the compressor 10 can change the stroke of the piston 22, that is, the discharge capacity of the refrigerant gas.

For example, when the internal pressure of the crank chamber 15 decreases, the inclination angle of the swash plate 19 increases and the discharge capacity of the compressor 10 increases.
A swash plate 19 indicated by a two-dot chain line in FIG. 1 shows a state of the maximum inclination angle in contact with the lug plate 18.
On the contrary, when the internal pressure of the crank chamber 15 increases, the inclination angle of the swash plate 19 decreases and the discharge capacity of the compressor decreases.
A swash plate 19 shown by a solid line in FIG. 1 shows a state of a minimum inclination angle.

The capacity control valve 45 is press-fitted into a valve installation hole 40 formed in the rear housing 14 and is fixed to the rear housing 14 by a retaining ring 44.
The retaining ring 44 is a member for preventing the displacement control valve 45 from coming out of the valve installation hole 40, and is attached to an annular groove 43 formed in the rear housing 14, as shown in FIG.

The valve installation hole 40 is formed in the radial direction from the side of the rear housing 14.
The valve installation hole 40 communicates with the air supply passage 42, and the capacity control valve 45 inserted into the valve installation hole 40 is located in the air supply passage 42.
The valve installation hole 40 is a hole that follows the outer peripheral shape of the capacity control valve 45, and is set to a diameter that allows the capacity control valve 45 to be installed by press fitting.
As shown in FIG. 2, the rear housing 14 forms a valve installation hole inner peripheral surface 40 </ b> A that is an inner peripheral surface of the valve installation hole 40.
The valve installation hole inner circumferential surface 40A is formed such that the diameter of the valve installation hole 40 decreases stepwise from the opening side to the bottom side of the valve installation hole 40.

As shown in FIG. 2, the capacity control valve 45 is an external control type control valve including a control valve main body 46 and a connector 66 connected to an end of the control valve main body 46.
The control valve body 46 includes an electromagnetic solenoid 48 and a valve mechanism 47 connected to the electromagnetic solenoid 48.
In a state where the capacity control valve 45 is press-fitted, the control valve main body 46 is positioned on the bottom side of the valve installation hole 40, and the connector 66 is positioned on the opening side of the valve installation hole 40.

The electromagnetic solenoid 48 includes a coil 49 that is excited by receiving a current supply, a fixed iron core 50 provided through the coil 49, a movable iron core 51 that reciprocates a fixed distance with respect to the fixed iron core 50, and a movable And an urging spring 52 for applying an urging force for separating the iron core 51 from the fixed iron core 50.
The electromagnetic solenoid 48 is covered with a cover 48A formed of an iron-based material.
The fixed iron core 50 attracts the movable iron core 51 by exciting the coil 49.
The urging spring 52 is provided between the fixed iron core 50 and the movable iron core 51, and the urging force of the urging spring 52 separates the movable iron core 51 from the fixed iron core 50 when the coil 49 is demagnetized.

The electromagnetic solenoid 48 is subjected to current supply control (duty control) by the control computer C shown in FIG.
The control computer C supplies current to the electromagnetic solenoid 48 when the air conditioner operation switch SW is turned on, and stops supplying current when the air conditioner operation switch SW is turned off.
A room temperature setter TS and a room temperature detector TD are connected to the control computer C.
In the state in which the air conditioner operation switch SW is on, the control computer C determines the current to the electromagnetic solenoid 48 based on the temperature difference between the target temperature set by the room temperature setter TS and the detected room temperature detected by the room temperature detector TD. Control the supply.

The valve mechanism 47 includes a cylindrical valve case 53 connected to the end of the electromagnetic solenoid 48.
A space in the valve case 53 is partitioned into a pressure sensitive chamber 54 and a valve accommodating chamber 55 by a partition wall.
The pressure sensing chamber 54 is located near one end (the bottom side of the valve installation hole 40) of the valve case 53, and the valve accommodating chamber 55 is located near the other end (the opening side of the valve installation hole 40).
The pressure sensing chamber 54 communicates with ports 56 and 57 formed in the valve case 53.
A communication passage 42 </ b> A that communicates the discharge chamber 27 and the port 57 and a communication passage 42 </ b> B that communicates the port 56 and the crank chamber 15 are passages that constitute the air supply passage 42.
The valve storage chamber 55 communicates with another port 58 formed in the valve case 53.
A passage 39 communicates the port 58 with the suction chamber 26.

A valve hole 59 is formed in the valve case 53.
A rod 60 is fixed to the movable iron core 51, and the tip of the rod 60 projects into the valve housing chamber 55.
A valve component 61 as a valve element is connected to the tip of the rod 60.
The valve component 61 opens and closes the valve hole 59, and the pressure sensitive chamber 54 and the port 57 communicate with each other when the valve hole 59 is opened.
Thereby, the refrigerant gas in the discharge chamber 27 is introduced into the crank chamber 15 through the communication passage 42A, the capacity control valve 45, and the communication passage 42B.
When the valve hole 59 is closed, the pressure sensitive chamber 54 and the port 57 are blocked.
The valve structure 61 abuts on a pressure-sensitive mechanism 62 disposed in the pressure-sensitive chamber 54.

The pressure sensing mechanism 62 includes a bellows 63 having a bellows, a plate-like pressure receiving body 64 connected to the bellows 63, and a biasing spring 65 having a biasing force that causes the pressure receiving body 64 to approach the valve component 61. .
The fixed end of the bellows 63 is fixed to the valve case 53, and the movable end of the bellows 63 is fixed to the pressure receiving body 64.
The urging spring 65 is interposed between the valve case 53 and the pressure receiving body 64 in the bellows 63.
The inside of the bellows 63 is a vacuum.

Next, the connector part 66 will be described.
The connector part 66 is a member connected to the electromagnetic solenoid 48.
The connector portion 66 is formed of a resin material that is an insulating material, and includes a conductive member (not shown) that energizes the coil 49 and a terminal 67.
The connector portion 66 is formed in a columnar shape, and a terminal portion 66A on which a terminal 67 is provided is formed on an end surface 66C of the connector portion 66.
The outer diameter of the connector portion 66 is set slightly smaller than the hole diameter on the opening side of the valve installation hole 40.
In a state where the capacity control valve 45 is press-fitted into the valve installation hole 40, the outer peripheral surface 66B of the connector part 66 follows the inner peripheral surface 40A of the valve installation hole.

The connector portion 66 includes a protrusion 68 that protrudes outward from the outer peripheral surface 66B in the radial direction.
Since the protrusion 68 is formed over the circumferential direction of the outer peripheral surface 66B, it is an annular protrusion that is continuous in the circumferential direction of the outer peripheral surface 66B.
The protrusion 68 is integrally formed with the connector portion 66 by the same resin material as the connector portion 66.
The protrusion 68 functions as a seal that prevents foreign matter from entering the electromagnetic solenoid 48 in the valve installation hole 40 from the outside when the displacement control valve 45 is press-fitted.
The protrusion 68 functions as a reinforcing rib that improves the strength of the connector portion 66 in addition to a sealing function that prevents foreign matter from entering.

In FIG. 3, the principal part (upper figure) of the connector part 66 at the time of press fitting and the principal part (lower figure) of the connector part 66 before press fitting are shown.
The longitudinal section of the protrusion 68 before being press-fitted is arcuate.
Since the vertical cross section of the protrusion 68 is arcuate, the protrusion 68 has an inclined surface (denoted as a “press-fit side inclined surface”) 68A facing the press-fitting direction (indicated by a white arrow in FIG. 3) and a counter-pressing direction. It has an inclined surface 68B (referred to as “reverse press-fitting-side inclined surface”) 68B.
The press-fitting side inclined surface 68A reduces the frictional resistance generated between the valve installation hole inner peripheral surface 40A and the protrusion 68 when the capacity control valve 45 is press-fitted.

The maximum diameter of the connector portion 66 including the protrusion 68 is set larger than the hole diameter of the valve installation hole 40.
A distance between the outer peripheral surface 66B of the connector portion 66 and the inner peripheral surface 40A of the valve installation hole when the capacity control valve 45 is press-fitted is defined as a gap distance G.
In this embodiment, as shown in FIG. 3, the displacement control valve 45 is set over the longitudinal direction corresponding to the connector portion 66 and the electromagnetic solenoid 48.
When the maximum distance in the radial direction of the protrusion 68 is the protrusion height T, a distance (TG) obtained by subtracting the gap distance G from the protrusion height T corresponds to a fitting allowance H that is a deformation amount at the time of press-fitting.
The fitting allowance H is defined by conditions such as the physical properties of the resin material forming the protrusion 68.
It suffices that the amount corresponding to the fitting allowance H of the protrusion 68 at the time of press-fitting is elastically deformed or plastically deformed by press-fitting so that the protrusion 68 can fill the gap between the connector portion 66 and the valve installation hole 40 without a gap.
At least, in order for the protrusion 68 to have the fitting allowance H, it is necessary to satisfy the condition of the protrusion height T> the gap distance G.

A plurality of O-rings 70, 71, 72 as gas seals are attached to the outer periphery of the valve mechanism 47.
The O-ring 70 mounted in the vicinity of the pressure sensitive chamber 54 partitions between the port 56 and the port 57 in the valve installation hole 40.
Since the O-ring 70 is attached to the capacity control valve 45, the refrigerant gas does not leak between the port 56 and the port 57.
Another O-ring 71 in the vicinity of the valve storage chamber 55 partitions between the ports 57 and 57 in the valve installation hole 40 so as to prevent leakage of refrigerant gas between the port 57 and the port 58.
The O-ring 72 attached in the vicinity of the electromagnetic solenoid 48 prevents the refrigerant gas passing through the port 58 from leaking to the electromagnetic solenoid 48 side.
These O-rings 70 to 72 function as gas seals that prevent refrigerant gas from leaking.
In particular, O-rings 70 to 72 are employed because it is necessary to prevent leakage of refrigerant gas that has a high pressure relative to atmospheric pressure.

In the region located on the bottom side of the O-ring 72 in the valve installation hole 40, the refrigerant gas is in a pressure atmosphere corresponding to each region partitioned by the O-rings 70 to 72.
On the other hand, the region of the valve installation hole 40 that is closer to the opening side than the O-ring 72 is in an atmospheric pressure atmosphere, and the connector 66 after press-fitting faces the atmospheric pressure atmosphere.

  The capacity control valve 45 configured as described above is configured to control the flow rate of the refrigerant gas in the supply passage 42 by controlling the opening and closing of the valve component 61 as a valve element based on the pressure of the refrigerant gas in the suction pressure region and the electromagnetic force generated by an external signal. To control.

Next, press-fitting into the valve installation hole 40 of the capacity control valve 45 according to the embodiment of the present invention will be described.
In the production process of the compressor 10, there is a process of press-fitting the capacity control valve 45 into the valve installation hole 40 of the rear housing 14.
O-rings 70 to 72 are attached to the valve mechanism 47 in advance in the capacity control valve 45 before press-fitting.
Before the press-fitting, the protrusion 68 formed on the connector portion 66 is in the state of the protrusion height T as shown in FIG.

The capacity control valve 45 is press-fitted into the valve installation hole 40 with the valve mechanism 47 of the capacity control valve 45 facing the valve installation hole 40.
At the time of press-fitting the capacity control valve 45 into the valve installation hole 40, when the valve mechanism 47 is pushed into the valve installation hole 40, the O-rings 70 to 72 are brought into pressure contact with the inner circumferential surface 40A of the valve installation hole.

When the connector 66 is pushed into the valve installation hole 40 by continuing the press-fitting of the capacity control valve 45, at least one of elastic deformation and plastic deformation occurs in the protrusion 68.
The portion corresponding to the fitting allowance H of the protrusion 68 enters between the outer peripheral surface 66B of the connector portion 66 and the inner peripheral surface 40A of the valve installation hole by deformation.
At this time, as shown in FIG. 3 (upper drawing), the protrusion 68 is in pressure contact with the inner peripheral surface 40A of the valve installation hole over the outer peripheral surface of the connector portion 66.

When the connector 66 is pushed into the valve installation hole 40 due to the press-fitting of the capacity control valve 45, a part of the press-fitting-side inclined surface 68A is in sliding contact with the valve installation hole inner peripheral surface 40A.
In the sliding contact between a part of the press-fitting side inclined surface 68A and the valve installation hole inner peripheral surface 40A, the protrusion 68 is compared with the sliding contact of both the 40A and 68 when the press-fitting side inclined surface 68A is not formed. The frictional resistance between 68 and the valve installation hole inner peripheral surface 40A is reduced.

After the capacity control valve 45 is pushed to a predetermined position in the valve installation hole 40, the retaining ring 44 is mounted in the annular groove 43 of the rear housing 14.
The retaining ring 44 presses the end surface 66C of the connector portion 66, and the capacity control valve 45 is maintained in a state where it does not escape from the valve installation hole 40.

In a state where the capacity control valve 45 is press-fitted, even if the compressor 10 is exposed to foreign matter (for example, salt water), the protrusion 68 performs a sealing function, and the foreign matter does not enter the electromagnetic solenoid 48.
In the state in which the capacity control valve 45 is press-fitted, the region of the valve installation hole 40 on the opening side of the O-ring 72 is in an atmospheric pressure atmosphere regardless of whether the compressor 10 is operated or stopped.
On the other hand, the region on the bottom side of the O-ring 72 is partitioned by O-rings 70 to 72, and the pressure atmosphere of the refrigerant gas corresponding to each region related to the ports 56 to 58 becomes during the operation of the compressor 10.

This embodiment has the following effects.
(1) Even if the capacity control valve 45 in the press-fitted state is exposed to foreign matter such as salt water, the protrusion 68 formed of a resin material can prevent foreign matter from entering the electromagnetic solenoid 48 side from the outside. it can. As a result, it is not necessary to prevent foreign matter from entering the electromagnetic solenoid 48 from the outside using an O-ring as in the prior art, and the number of parts of the capacity control valve 45 can be reduced and the manufacturing cost can be reduced.
(2) Since the protrusion 68 is formed in an annular shape along the circumferential direction of the outer peripheral surface 66B of the connector portion 66, the protrusion 68 functions as a reinforcing rib in addition to functioning as a sealing rib to prevent foreign matter from entering. 68 contributes to improving the strength of the connector portion 66. Further, in this embodiment, it is not necessary to form an O-ring mounting groove in the connector portion 66, and the connector portion 66 can be shortened as compared with a case where foreign matter is prevented from entering using an O-ring. It becomes.

(3) When the capacity control valve 45 comes into contact with the valve installation hole inner circumferential surface 40A when the capacity control valve 45 is press-fitted, there is a high possibility that the protrusion 68 of the connector portion 66 contacts the valve installation hole inner circumferential surface 40A. . For this reason, the possibility that the cover 48A is in contact with the inner peripheral surface 40A of the valve installation hole is relatively lower than that of the protrusion 68, and the possibility that the cover 48A is damaged by the contact is small. Since the O-rings 70 to 72 come into contact with the valve installation hole inner circumferential surface 40A when the valve mechanism 47 is press-fitted, there is almost no possibility of damage due to the contact. Even if the clearance between the valve installation hole inner peripheral surface 40A and the capacity control valve 45 is small and the coaxiality of both 40A and 45 is required to be high, damage to the capacity control valve 45 due to contact at the time of press-fitting is caused. Mostly avoided. As the clearance between both 40A and 45 becomes smaller, the projection 68 also becomes smaller.
(4) Since the protrusion 68 includes the press-fitting side inclined surface 68A, the protrusion 68 and the inner circumference of the valve installation hole when the capacity control valve 45 is press-fitted are compared with the case where the press-fitting side inclined surface 68A is not formed on the protrusion 68. The frictional resistance with the surface 40A is reduced. As a result, the force required for press-fitting the capacity control valve 45 can be reduced.
(5) Since the vertical section of the protrusion 68 is arcuate, the protrusion 68 is unlikely to be chipped when the capacity control valve 45 is press-fitted, and there is almost no possibility that a part of the protrusion 68 becomes foreign matter due to the crack. It is possible to prevent the performance of the sealing function from being deteriorated due to 68 chips.

(Another example)
Next, a control valve according to another example will be described.
In the control valve according to another example, the connector portion is provided with a protrusion different from the protrusion 68 of the above-described embodiment.
Since the difference from the above embodiment is only the projection in the connector portion, the description of the common configuration is omitted by using the description of the above embodiment, and the reference numerals used in the above description are shared. Use.

In FIG. 4, the principal part (upper figure) of the connector part 66 at the time of press fitting and the principal part (lower figure) of the connector part 66 before press fitting are shown.
The connector portion 66 shown in FIG. 4 is provided with a protrusion 168 protruding outward in the radial direction.
Since the protrusion 168 is formed over the outer peripheral surface 66B, it is an annular protrusion that is continuous in the circumferential direction of the outer peripheral surface 66B.
The protrusion 168 is integrally formed with the connector portion 66 by a resin material.

As shown in FIG. 4, the longitudinal section of the protrusion 168 before being press-fitted has a parallelogram shape, and is a receding wing shape retreating from the press-fitting direction (indicated by a white arrow in FIG. 4) toward the counter-pressing direction. It is.
The protrusion 168 has a linear inclined surface (referred to as “press-fit side inclined surface”) 168A facing in the press-fitting direction and an inclined surface (referred to as “counter-press-in side inclined surface”) 168B facing in the counter press-fitting direction.
In this example, the press-fit side inclined surface 168A and the counter-press-fit side inclined surface 168B are parallel to each other.
The press-fitting side inclined surface 168A reduces the frictional resistance generated between the valve installation hole inner peripheral surface 40A and the protrusion 168 when the capacity control valve 45 is press-fitted.

The maximum diameter of the connector portion 66 on which the protrusion 168 is formed is set larger than the diameter of the valve installation hole 40.
The distance between the outer peripheral surface 66B of the connector portion 66 and the valve installation hole inner peripheral surface 40A when the capacity control valve 45 is press-fitted is defined as a gap distance G.
In this embodiment, as shown in FIG. 4, it is set over the longitudinal direction of the capacity control valve 45 corresponding to the connector portion 66 and the electromagnetic solenoid 48.
Assuming that the maximum radial distance of the protrusion 168 is the protrusion height T, a distance (TG) obtained by subtracting the gap distance G from the protrusion height T corresponds to a fitting allowance H that is a deformation amount at the time of press-fitting.
The fitting allowance H is defined by conditions such as physical properties of the resin material forming the protrusion 168.
It is only necessary that the portion corresponding to the fitting allowance H of the projection 168 is elastically deformed or plastically deformed by press-fitting and the projection 168 can fill the gap between the connector portion 66 and the valve installation hole 40 without a gap.
In order for at least the protrusion 168 to have a fitting allowance H, the condition of protrusion height T> gap distance G should be satisfied.

The protrusion 168 functions as a seal that prevents foreign matter from entering the electromagnetic solenoid 48 from the outside when the displacement control valve 45 is press-fitted.
The protrusion 168 functions as a reinforcing rib that improves the strength of the connector portion 66 in addition to a sealing function that prevents foreign matter from entering.
The protrusion 168 according to this example has the same effects as the effects (1) to (4) of the previous embodiment.
Furthermore, the protrusion 168 has a shape that can easily use the elastic force of the resin material, and plastic deformation of the protrusion 168 can be suppressed.
Since the plastic deformation of the protrusion 168 is suppressed at the time of press-fitting and the protrusion 168 is elastically deformed at the time of press-fitting, even if the capacity control valve 45 is inserted / removed from the valve installation hole 40, the protrusion 168 having the suppressed plastic deformation has a sealing function. Can be maintained.

In addition, the control valve for the compressor according to the above-described embodiment shows an embodiment of the present invention, and the present invention is not limited to the above-described embodiment. Various changes are possible within the scope of the gist.
In the above-described embodiment including another example, the external control type capacity control valve applied to the swash plate type variable capacity compressor is used, but is not limited to the capacity control valve. It may be a control valve with an electromagnetic solenoid that controls the amount. In this case, the format of the compressor is not particularly limited. In addition, the control valve is not only fixed to the housing forming the compressor body by press fitting, but may be fixed to the compressor accessory member or peripheral member such as a bracket or a refrigerant pipe by press fitting. Good.
○ In the above-mentioned embodiment including another example, the vertical cross section of the protrusion is an arc shape or a parallelogram shape. For example, the longitudinal section may be an elliptical arc shape or a long arc shape, and the shape of the protrusion is not limited. In particular, it is preferable that the protrusion has an inclined surface facing the press-fitting direction (the press-fitting side inclined surface in the embodiment). If the inclined surface can reduce the frictional resistance with the press-fitted side, it includes a curved surface or a flat surface. Alternatively, an inclined surface combining a curved surface and a flat surface may be used.

It is a longitudinal section of a compressor to which a control valve concerning an embodiment of the present invention was applied. It is a longitudinal cross-sectional view which shows the control valve of the press injection state which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which expands and shows the principal part of the control valve at the time of press injection and before press injection. It is a longitudinal cross-sectional view which expands and shows the principal part of the control valve at the time of the press injection which concerns on another example, and before press injection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Compressor 11 Housing 14 Rear housing 15 Crank chamber 19 Swash plate 22 Piston 35 External refrigerant circuit 40 Valve installation hole 45 Capacity control valve 46 Control valve main body 48 Electromagnetic solenoid 61 Valve component 66 Connector part 66B Outer peripheral surface 68, 168 Protrusion 68A, 168A Press-fit side inclined surface G Clearance distance H Fitting allowance T Projection height

Claims (3)

In a control valve for a compressor provided with a control valve main body portion provided with a valve body, and a connector portion connected to the control valve main body portion,
The connector portion is formed of a resin material, and includes a protrusion formed in an annular shape over the circumferential direction of the outer peripheral surface of the connector portion.
The control valve is press-fitted through the protrusion,
A control valve for a compressor, wherein the connector portion after press fitting faces an atmospheric pressure atmosphere. The control valve body includes an electromagnetic solenoid,
The control valve for a compressor according to claim 1, wherein the connector portion is connected to the electromagnetic solenoid.   3. The control valve for a compressor according to claim 1, wherein the protrusion has an inclined surface facing the press-fitting direction.