JP2002285966A - Control valve filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a control valve filter, in which when once engagement means is engaged, engagement is prevented from being easily disengaged, even if it receives shocks from an outside. SOLUTION: In a hook 55 of a filter 51, one of split parts is provided with a hook part 55a, and the other of the split parts is provided with a mooring part 55b. At assembling of the filter 51 to a control valve body, a frame body 53 is enlarged radially against an elastic force, and at an assembling position, the frame body 53 obeys the urging force. Then, the frame body 53 is gradually returned to be a ring shape, and the hook part 55a is moved toward the mooring part 55b. At this time, an edge at a claw 56 side of the hook part 55a abuts on an inclined surface 56a of the claw 56. When the hook part 55a is pressed toward the direction of the mooring part 55b, the claw 56 and a ring frame 53a are flexed gradually to the outside and an end face of the hook part 55a is, in a state of being capable of passing through a tip of the claw 56. The hook part 55a is engaged to the mooring part 55b, and at the same time, the claw 56 and the ring frame 53a are returned to original positions, whereby an engaging state is maintained by a fixing surface 56a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve used in a variable displacement compressor, and more particularly to a control valve filter for preventing foreign substances from entering the control valve.

[0002]

2. Description of the Related Art Conventionally, in a control valve used for a variable displacement compressor, when foreign matter such as abrasion powder in a discharge chamber as a discharge pressure area, a suction chamber as a suction pressure area, and a control chamber enters the control valve. Normal operation of the control valve may be hindered by, for example, biting into the valve seat of the control valve. Therefore, for example, in Japanese Patent Application Laid-Open No. Hei 6-336978, a control valve filter (hereinafter, referred to as a filter) as a filtering means is provided in all of the fluid conducting ports of the control valve communicating with the discharge chamber, the suction chamber, and the control chamber.
Are disclosed, and a technique for preventing intrusion of foreign matter into the control valve is disclosed.

As shown in FIG. 10, a filter 51 has an annular frame 53 having a plurality of windows 53c on a side surface and a dividing portion at one position, and a filtering material stretched over each window 53c. And a net portion 54 as The frame 53 is made of an elastic member. One of the divided portions is provided with a hook portion 55a having a hook-like tip, and the other is provided with a hook portion 5a.
A mooring portion 55b is provided which can be disengaged from 5a. The hook portion 55a and the mooring portion 55b constitute a hook portion 55 as an engagement means.

On the other hand, a control valve (not shown) has an annular groove formed in the peripheral surface of the body of the control valve. A fluid conducting port communicating with each of the chambers is open in the annular groove, and the filter 5
1 is fitted in the annular groove.

The assembly of the filter 51 to the control valve is performed as follows. The frame 53 is expanded in diameter against the elastic force, and is positioned in the annular groove where the fluid communication port is opened on the body peripheral surface of the control valve. At this time, the hook portion 55 is in a detached state. Thereafter, when the frame 53 is subjected to elastic force, the frame 53 returns to an annular shape by the elastic force and is fitted into the annular groove. At this time, the hook portion 55 is engaged. This ensures that the filter 51 covers the fluid conducting port.

[0006]

However, in the above-mentioned conventional filter structure, after the control valve with the filter is assembled in the storage hole provided in the compressor body, the hook portion is subjected to an external impact or the like. There was a case where the engagement was released. If the hook part of the filter comes off after the filter is installed in the storage hole, the inner diameter of the storage hole is configured to be somewhat larger than the outer diameter of the filter, so that the filter enters the gap between the storage hole and the control valve. Or the mounting position is shifted, and the fluid conduction port is not covered. For this reason, there have been cases where it is not possible to sufficiently prevent foreign matter from entering the control valve.

An object of the present invention is to provide a structure of a control valve filter which is not easily disengaged even if there is an external impact once the engagement means is engaged.

[0008]

According to the first aspect of the present invention, there is provided a control valve for a variable displacement compressor having a suction chamber, a discharge chamber and a control chamber. A control valve filter attached to at least one of the fluid communication ports, the control valve filter having a dividing portion at at least one position, wherein the dividing portion has engagement means engageable with each other; The gist is that a holding means for holding the engagement state of the engagement means is provided.

According to the above invention, even if the engaging means once engaged is subjected to an external impact, the engaging state is maintained by the holding means even if the engaging means is likely to be disengaged. Normal assembly is maintained.

[0010] In the second aspect of the present invention, the control valve filter includes a pair of annular frames and a filter material provided between the frames, and the engaging means includes a hook and a hook. A mooring part engageable with the mooring part, wherein the holding means is a claw provided on the mooring part side, which allows the hook to engage with the mooring part and prevents disengagement. That is the gist.

According to the invention, when the hook and the mooring portion of the control valve filter are engaged, the claw or hook is deformed and engaged by utilizing the shape of the claw. Further, the engagement state is automatically maintained by the claw portion simultaneously with the engagement.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5 for a control valve filter in a variable displacement compressor.

Variable capacity compressor (hereinafter referred to as compressor)
Since the basic structure itself can adopt various structures known in the related art, the description of the same parts as the conventional one will be simplified, and the description will be focused on the control valve filter (hereinafter referred to as a filter) which is a feature of the present invention. I do.

First, a compressor 70 shown in FIG. 1 includes a cylinder block 1 having a plurality of cylinder bores 1a, a front housing 2 and a rear housing 3.
The cylinder block 1 is joined and fixed between the front housing 2 and the rear housing 3, and a control room 4 is defined between the cylinder block 1 and the front housing 2.

The drive shaft 5 is rotatably supported between the cylinder block 1 and the front housing 2 via radial bearings 7 and 8. A shaft sealing device 6 is provided at a portion where the drive shaft 5 projects outside the front housing 2. Hereinafter, the side where the drive shaft 5 projects out of the compressor 70 and is connected to an external drive source (not shown) is referred to as a front side, and the opposite side is referred to as a rear side.

The rotation support 9 is fixed to the drive shaft 5 in the control room 4 so as to be integrally rotatable. Hinge mechanism 10
Is interposed between the rotary support 9 and the swash plate 11.
The swash plate 11 is slidable and tiltable in the axial direction of the drive shaft 5 under the guidance of the hinge mechanism 10, and is further rotatable integrally with the drive shaft 5. A piston 13 is moored to the outer peripheral portion of the swash plate 11 via a shoe 12, and the piston 13 reciprocates in the cylinder bore 1a as the swash plate 11 rotates.

The rear housing 3 has a discharge chamber 1 on the outer peripheral side.
4. A suction chamber 15 is defined on the inner peripheral side. A discharge valve 20 and a suction valve 18 are provided between the cylinder block 1 and the rear housing 3 forming the discharge chamber 14 and the suction chamber 15.
Are interposed.

The refrigerant gas in the suction chamber 15 is moved backward by the piston 13, that is, from right to left in FIG.
It is sucked into the cylinder bore 1a through a suction port 17 and a suction valve 18 formed in the valve forming body 16. The refrigerant gas sucked into the cylinder bore 1 a is compressed to a predetermined pressure by the forward movement of the piston 13, that is, from left to right in FIG. 1, and is discharged to the discharge port 19 formed in the valve forming body 16 and to the discharge port 19. The liquid is discharged to the discharge chamber 14 via the valve 20.

Further, a bleed passage 24 is formed at the center of the valve forming body 16 to communicate the control chamber 4 and the suction chamber 15. In the cylinder block 1 and the rear housing 3,
An air supply passage 21 that communicates between the discharge chamber 14 and the control chamber 4 is penetrated. A control valve 30 is interposed in the air supply passage 21. The rear housing 3 is provided with a communication passage 22 that communicates between the suction chamber 15 and the control valve 30.

In the rear housing 3 on the rear side of the discharge chamber 14 and the suction chamber 15, a storage hole 3 for storing the control valve 30 is provided.
1 is provided. The storage hole 31 is formed in a shape substantially along the outer shape of the control valve 30.

Next, as shown in FIG. 2, the control valve 30
It comprises a control valve body 34 and a solenoid part 35. A pressure-sensitive chamber 37 is defined by the control valve body 34 and a cap-like lid 36 that covers a recess provided at one end of the control valve body 34. A bellows 38 as a pressure-sensitive member is housed in the pressure-sensitive chamber 37 so as to be displaceable.

The transmission rod 39 extends through an insertion hole 40 provided in the control valve body 34, and has one end in contact with the bellows 38. One end of a valve body 41 is in contact with the other end of the transmission rod 39.

The valve body 41 is housed in a valve chamber 43 defined by a recess provided at the other end of the control valve body 34 and a fixed iron core 42 provided in contact with the control valve body 34. . Further, the valve element 41 is inserted into the insertion hole 40 in the valve chamber 43.
The peripheral valve seat 43 a is opened and closed according to the expansion and contraction of the bellows 38.

A movable core 44 is provided at the other end of the fixed core 42 via a spring 45, and a tube 46 is provided so as to cover the fixed core 42 and the movable core 44. Further, an electromagnetic coil 47 as a magnetic field applying means for applying an electromagnetic force between the fixed iron core 42 and the movable iron core 44 is provided on an outer peripheral portion of the tube 46 to constitute a solenoid part 35.

At the connection between the control valve body 34 and the air supply passage 21 communicating with the discharge chamber 14, a high-pressure port 50 as a first fluid conducting port is formed in the outer peripheral surface of the body of the control valve body 34. It is open in the formed annular groove 52. A filter 51 as a filtering material is fitted into and assembled with the annular groove 52 so as to cover the high-pressure port 50.

At the connection between the control valve body 34 and the air supply passage 21 communicating with the control chamber 4, a control port 60 as a second fluid conducting port is provided similarly to the high pressure port 50. Open in an annular groove 62 formed in the outer peripheral surface of the body. A filter 61 is provided so as to cover the control port 60.
It is fitted and assembled.

As shown in FIG. 3, the frame 53 of the filter 51
Is a pair of ring frames 53 made of an elastic member.
a and a plurality of bars 53b. The bar 53b is interposed between the ring frames 53a. Further, a mesh member 54 as a filtering member is stretched over a window 53c formed by the ring frame 53a and the bar member 53b. Filter 5
Reference numeral 1 denotes an integrally molded product including a frame 53 and a net member 54.

One portion of each ring frame 53a is divided at the end face of the bar 53b in the direction perpendicular to the drawing. The dividing portion is provided with a hook portion 55 as an engagement means for aligning the dividing portion. The ring frame 53a is configured to have a narrow width on the symmetrical side of the hook portion 55 with respect to the center axis of the filter 51, so that the diameter of the frame body 53 at the time of assembly can be easily increased.

As shown in FIG. 4, a hook 55a having a bent end is provided at one of the divided portions so as to protrude in the direction of the other divided portion. The other dividing part has a hook 55
The mooring portion 55b that can be engaged with a is constituted by a part of the bar 53b. The hook portion 55a and the mooring portion 55b constitute a hook portion 55.

Further, the ring frame 53a on the side of the mooring portion 55b
Is provided with a substantially trapezoidal claw portion 56 on one side. The claw portion 56 is provided on the outer peripheral side of the ring frame 53a, and its tip projects over the window portion 53c. On the outer peripheral side of the filter 51 at the tip of the claw portion 56, an inclined surface 56 a
Are formed. The filter 5 at the tip of the claw portion 56
A fixing surface 56b for fixing the hook 55a is formed on the inner peripheral side of the inner surface 1 with the acute angle θ interposed between the inclined surface 56a and the fixing surface 56b.

The side of the hook portion 55a facing the claw portion 56 is a side surface portion 57, and the helicopter on the inner peripheral side of the side surface portion 57 is an edge portion 57.
a.

Hereinafter, the filter 5 configured as described above will be described.
The assembly of the first control valve 30 will be described with reference to FIG. 5, which is a sectional view taken along line XX of FIG.

First, while expanding the diameter of the frame 53 on the body of the control valve body 34 against the elastic force, the high pressure port 5 is formed on the circumferential surface of the body.
0 is located at the opening. Then, the frame 53 is subjected to elastic force. At this time, as shown in FIG. 5A, the hook portion 55a is on the outer peripheral side as viewed from the center direction of the filter 51 with respect to the claw portion 56, and the edge portion 57a is in contact with the inclined surface 56a.

Subsequently, when the hook portion 55a is pressed into the mooring portion 55b, as shown in FIG.
a is pressed by the side surface 57 of the hook 55a. Due to this pressing force, the claw portion 56 and the ring frame 53a provided with the claw portion 56 gradually bend to the outside from the width Z of the filter 51, and the side surface portion 57 of the hook portion 55a can pass through the tip of the claw portion 56. Becomes

As shown in FIG. 5 (c), the hook 55a further moves in the direction of the mooring portion 55b, and the side portion 5a of the hook 55a is moved.
7 passes through the tip of the claw portion 56, and the hook portion 55a
b. In the engaged state, the hook portion 55 a is located on the inner peripheral side of the claw portion 56, so that there is no pressing portion of the claw portion 56. For this reason, the claw portion 56 and the ring frame 53a return to their original positions under the elastic force. As a result, the fixing surface 56b of the claw portion 56 covers the upper surface of the hook portion 55a, and the engaged state of the hook portion 55 is maintained.

The present embodiment having the above configuration has the following effects. (1) Once the hook portion 55 is engaged, even if the hook portion 55 is disengaged due to an external impact or the like, the engaged state is held by the fixing surface 56b of the claw portion 56 as the holding means. You. Thus, the filter 51 is properly assembled. (2) With a simple structure in which only the claw portion 56 is provided in the conventional filter, at the same time when the hook portion 55a and the anchor portion 55b are engaged,
The holding of the engaged state by the claw portion 56 is automatically performed.

(Second Embodiment) Next, a second embodiment which is different from the first embodiment in the structure of the hook portion of the control valve filter will be described with reference to FIGS. Except for the structure of the hook portion, the configuration is the same as that of the first embodiment, and the description is omitted.

As shown in FIG. 6, one of the divided portions of the filter 81 is provided with a hook portion 58 having a bent tip so as to project in the direction of the other divided portion. Further, the hook 58
Is divided into a wide portion 58a and a narrow portion 58b to form a fork. The width of the narrow portion 58b is configured to be narrower than the width of the wide portion 58a, and the space between the wide portion 58a and the narrow portion 58b is a gap 59.

In the other dividing portion, the mooring portion 55b and the claw portion 56 with which the hook portion 58 is engaged are configured in the same manner as in the first embodiment. The narrow portion 58b is provided on the claw portion 56 side. Further, the side surface on the side of the narrow portion 58b facing the claw portion 56 is the side surface portion 63, and the filter 81 of the side surface portion 63 is provided.
The helicopter on the inner peripheral side is an edge portion 63a. Hook 58
And the mooring portion 55b constitute a hook portion 55.

Hereinafter, the filter 8 constructed as described above will be described.
1 will be described with reference to FIG.

First, while expanding the diameter of the frame 53 against the elasticity of the body of the control valve body 34, the high pressure port 5 is formed on the peripheral surface of the body.
0 is located at the opening. Then, the frame 53 is subjected to elastic force. At this time, as shown in FIG. 7A, the hook portion 58 is located on the outer peripheral side as viewed from the center direction of the filter 81 with respect to the claw portion 56, and the edge portion 63a of the narrow portion 58b comes into contact with the inclined surface 56a. It will be in the state of having done.

Subsequently, when the hook portion 58 is pressed down against the mooring portion 55b, as shown in FIG.
The side surface 63 of the narrow portion 58b is pressed by the inclined surface 56a. Due to this pressing force, the narrow portion 58b gradually bends in the direction of the arrow V1, that is, into the gap 59, and the side surface portion 63
6 It is possible to pass through the tip.

As shown in FIG. 7C, the hook portion 58 further moves in the direction of the mooring portion 55b, and the side portion 6 of the narrow portion 58b is moved.
3 passes through the tip of the claw portion 56, and the hook portion 58b of the hook portion 58
Is engaged with the mooring portion 55b. In the engaged state, the narrow portion 5
Since nothing presses 8b, the narrow portion 58b is subjected to elastic force and returns to the original position in the direction of the arrow V2. As a result, the fixing surface 56b of the claw portion 56 is moved to the narrow portion 58b, that is, the hook 5
5a, so that the hook portion 55 is held in the engaged state.

The present embodiment having the above configuration has the following effects. (1) Since the hook 58 is bent, the claw 5
6 and the frame 53a of the filter 81 compared to the first embodiment in which the frame 53a of the filter 81 needs to be bent.
Can be a sturdy member. (2) By forming the hook portion 58 bifurcated and bending the narrow portion, the hook portion 58 side can be bent without difficulty.

The above embodiment can be modified and implemented as follows. O In the first embodiment and the second embodiment, the claw 56
Is provided at one location, but may be provided at a plurality of locations. For example, as shown in FIG. 8, a configuration is conceivable in which claws 56 are provided on both sides of the ring frame 53a opposite to each other. O In the first embodiment and the second embodiment, the claw 56
Are provided on the outer periphery of the ring frame 53a to hold the hooks 55a, 58 from the outer periphery of the filters 51, 81.
It is also possible to change the position and the shape of No. 6 and carry out.
For example, as shown in FIG. 9, the claw portion 82 is provided on the hook portion 55 a side, and the concave portion 83 is provided at a position corresponding to the claw portion 82 of the ring frame 53 a. A configuration in which the engagement of the portion 55 is held may be considered. ○ In the first embodiment and the second embodiment, the filter 5
The control valves to be attached to 1, 81 are not limited to the control valve 30,
Other control valves of different types can be similarly configured. ○ In the first embodiment and the second embodiment, the filter 5
The fluid conducting port in which the fluid passages 1 and 81 are installed is the high pressure port 50. However, the present invention is not limited to this. ○ In the first embodiment and the second embodiment, the filter 5
Reference numerals 1 and 81 denote an integrally molded product composed of the frame 53 and the net member 54, but the present invention is not limited to this.
For example, it is possible to configure the entire filter with the same member, instead of using different members as in the above embodiment. In the first embodiment and the second embodiment, the frame 53 is divided at one position, but may be divided at a plurality of positions. For example, it is possible to implement a configuration in which there are two divided portions and two half-moon-shaped frames are aligned.

[0046]

According to the first aspect of the present invention, even if the engaging means once engaged is disengaged due to an external impact or the like, the engaged state is maintained by the holding means. A structure in which the normal assembly of the control valve filter is maintained can be realized.

According to the second aspect of the present invention, the claw portion or the hook portion is engaged while being deformed by utilizing the inclined surface of the claw portion. Therefore, a structure in which the engagement state is automatically held by the fixing surface of the claw portion simultaneously with the engagement can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a variable displacement compressor according to a first embodiment.

FIG. 2 is a cross-sectional view of the control valve according to the first embodiment.

FIG. 3 is a perspective view of the filter of the first embodiment.

FIG. 4 is a perspective view showing a main part of the filter of the first embodiment.

5A to 5C are cross-sectional views taken along line XX in FIG.

FIG. 6 is a perspective view illustrating a main part of a filter according to a second embodiment.

FIGS. 7 (a) to 7 (c) are plan views as viewed from the W direction in FIG.

FIG. 8 is an enlarged view of a main part of another embodiment.

FIG. 9 is an enlarged view of a main part of another embodiment.

FIG. 10 is a perspective view of a conventional control valve filter.

[Explanation of symbols]

 Reference Signs List 4 control chamber 14 discharge chamber 15 suction chamber 30 control valve 50, 60 high-pressure port and control port 51, 61, 81 filter as control valve filter 53 frame 54 mesh member 55 hook portion as engagement means 55a hook portion 55b mooring portion 56 claw portion as holding means 56a inclined surface provided on claw portion 56b fixed surface 70 variable displacement compressor θ acute angle.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaru Hamazaki 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 3H003 AA03 BG02 3H076 AA06 BB13 CC41 CC84 CC85 CC93 4D064 AA03 BB01 BB11

Claims (2)

[Claims] 1. A control valve filter for use in a control valve of a variable displacement compressor having a suction chamber, a discharge chamber, and a control chamber, the filter being attached to at least one of a fluid conducting port connected to each of the chambers. The control valve filter has a dividing portion at at least one position, and the dividing portion is provided with engaging means capable of engaging with each other, and holding means for maintaining the engaging state of the engaging means. A control valve filter, characterized in that: 2. The control valve filter according to claim 1, wherein the control valve filter comprises a pair of annular frames and a filter material provided between the frames, and the engaging means is capable of engaging with the hooks. Mooring section,
The control according to claim 1, wherein the holding means is a claw provided on the mooring portion side, and allows the hook to engage with the mooring portion and prevents the hook from being disengaged. Valve filter.