JPH09264254A - Piston type compressor and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor, which can be easily assembled and is provided with a valve plate possessing an excellent sealing property, and an assembling method thereof. SOLUTION: Valve plates 13, 14 are individually arranged between a cylinder block 11 and a front housing 15 and between a cylinder block 12 and a rear housing 16. The valve plates 13, 14 includes intake valve forming plates 19, 20, main body plates 17, 18, and delivery valve forming plates 21, 22. The valve plates 13, 14 are fixed integrally in the two positions in the center part by means of rivets 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston type compressor used in, for example, a vehicle air conditioner.

[0002]

2. Description of the Related Art In a compressor of this type, as shown in FIG. 5, a cylinder block 7 having a cylinder bore 71 is provided.
2, housing 7 having discharge chamber 73 and suction chamber 74
A valve plate 76 is interposed between the valve plate 7 and the valve 5. In order to suck and discharge the refrigerant gas by the reciprocating motion of the piston 77, the valve plate 76 has a main body plate 85 having a gas distribution port 86, a discharge valve forming plate 79 having a discharge valve 78, and a suction valve 80. Intake valve forming plates 81 are provided respectively.

Conventionally, when the cylinder block 72 and the housing 75 are assembled, the body plate 85 of the valve plate 76, the discharge valve forming plate 79 and the suction valve forming plate 81 are separate bodies. Then, when the cylinder block 72 and the housing 75 are assembled, the body plate 8 is fixed by the pin 82.
5, the discharge valve forming plate 79 and the suction valve forming plate 81 are sequentially positioned with respect to the cylinder block 72. After that, the suction chamber 74 of the housing 75 is fixed by the bolts 83 that fasten and fix the cylinder block 72 and the housing 75.
A valve plate 76 is sandwiched and fixed between the partition wall 84 between the discharge chambers 73 and the cylinder block 72.

[0004]

Therefore, in the conventional compressor, although the body plate 85 of the valve plate 76 and the valve forming plates 79 and 81 are individually positioned with respect to the cylinder block 72 by the pin 82, Body plate 85 and valve forming plate 7
Strict positioning between 9 and 81 is difficult. Therefore, the positional relationship between the gas flow port 86 of the main body plate 85 and the suction valve 80 and the discharge valve 78 may be shifted, and gas may leak.
In order to reduce this risk, conventionally, the intake valve 80 and the discharge valve 78 are formed to be large with respect to the gas flow port 86, but with this configuration, the intake valve 80 and the discharge valve 78 and the main body are formed. The close contact area with the plate 85 becomes large and the close contact force becomes strong, so that the suction valve 80 and the discharge valve 78 may not be opened at the set pressure. Therefore, in the conventional compressor, the suction valve 80, the discharge valve 78, the main body plate 8
In order to reduce the contact area with 5, the main body plate 85 has to be subjected to rough surface processing and extra processing such as forming a recess for avoiding contact.

Moreover, in the conventional compressor, if the accuracy of the gap between the partition wall 84 and the cylinder block 72 is low, the valve plate 76 cannot be held at an appropriate pressure. In such a case, the sealing surface pressure between the main body plate 85 of the valve plate 76 and the valve forming plates 79, 81 cannot be secured, and gas leakage may occur between them. Valve plate 76
When a gas leak occurs in the part of, not only the compression efficiency is lowered, but the gas leaked from the discharge side flows to the suction side,
It may be compressed again and discharged, and the repeated compression may raise the discharge temperature, resulting in a decrease in cooling efficiency.

For this reason, in the conventional compressor, in order to secure a gap corresponding to the thickness of the valve plate 76, the cylinder block 72, the housing 75, and the like are required to have high processing accuracy.

The present invention has been made by paying attention to the problems existing in the above conventional techniques. An object of the present invention is to provide a piston type compressor and a method of assembling the piston type compressor that can reduce the risk of gas leakage without requiring extra processing or high processing accuracy.

[0008]

In order to achieve the above-mentioned object, in the invention described in claim 1, the valve plate includes a suction port for communicating the cylinder bore with the suction chamber and a discharge port for communicating the cylinder bore with the discharge chamber. A main body plate having at least one side, a valve forming plate having a suction valve, and at least one of a valve forming plate having a discharge valve are superposed, and the suction valve is opened by reciprocal movement of the piston. In a piston type compressor in which the refrigerant gas in the room is sucked into the cylinder bore and the refrigerant gas in the cylinder bore is discharged into the discharge chamber by opening the discharge valve, a fixing for fixing the valve forming plate to the main body plate. The means is provided between the main body plate and the valve forming plate.

According to a second aspect of the present invention, in the first aspect of the present invention, the valve plate is a main body plate, and a suction valve forming plate and a discharge valve each having a suction valve superposed on both sides of the main body plate. And a discharge valve forming plate having a.

According to the invention of claim 3, in the invention of claim 1 or 2, the valve plate includes a gasket,
The fixing means is characterized in that the gasket is fixed to the main body plate.

According to the fourth aspect of the present invention, the first to third aspects are provided.
In any one of the inventions, the valve plate includes a retainer plate having a restriction portion for restricting the opening degree of the discharge valve,
The fixing means is characterized in that the retainer plate is fixed to the main body plate.

According to the invention described in claim 5, claims 1 to 4 are provided.
In any one of the inventions, the fixing means is composed of a fixing member having a body portion penetrating the valve plate, and head portions provided at both ends of the body portion and tightening the outer surface of the valve plate. It is characterized by.

The invention according to claim 6 is characterized in that, in the invention according to claim 5, the cylinder block has a first recess for accommodating the head of the fixing member.

According to a seventh aspect of the invention, in the sixth aspect of the invention, the valve plate is positioned by the engagement of the head portion and the first recess. The invention according to claim 8 is characterized in that, in the invention according to any one of claims 5 to 7, the housing has a second recess for accommodating a head portion of the fixing member.

According to a ninth aspect of the invention, in the eighth aspect of the invention, the valve plate is positioned by the engagement of the head portion and the second recess. The invention according to claim 10 is characterized in that, in the invention according to any one of claims 5 to 9, the fixing member is constituted by a rivet, and both ends of the rivet constitute a head portion. .

According to an eleventh aspect of the present invention, in the invention according to the seventh or ninth aspect, the fixing member is constituted by a rivet, and the crushing head of the rivet is arranged on the housing side. To do.

According to the twelfth aspect of the present invention, the fifth to fifth aspects are provided.
In the invention described in any one of 9 above, the fixing member is constituted by a bolt and a nut, and the bolt head and the nut constitute a head portion.

According to the invention described in claim 13,
In the invention according to any one of 4 above, the fixing means includes:
It is characterized in that it is constituted by a pin press-fitted into the hole of the valve plate.

According to the invention described in claim 14,
In the invention described in any one of 4 above, the fixing means are provided at two or more positions on the valve plate.

According to the invention described in claim 15,
The invention according to any one of claims 4 and 14 is characterized in that the fixing means is arranged at a central portion of the valve plate.

According to a sixteenth aspect of the present invention, the first to third aspects are provided.
15. The invention according to any one of 15 above, wherein the cylinder block and the housing are tightened and fixed by bolts that penetrate the cylinder block and are screwed to the housing, and the fixing means for fixing the valve plate is separated from the position of the bolts. It is characterized by having been arranged.

According to a seventeenth aspect of the present invention, in the method of assembling the piston type compressor having the above construction, the valve plate is fixed to the main body plate and then the valve plate is assembled between the cylinder block and the housing. It is characterized by that.

Therefore, in the inventions according to claims 1, 2 and 17, the both are positioned with the valve forming plate fixed to the main body plate by the fixing means. According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the gasket is fixed to the main body plate by the fixing means. Therefore, the sealability of the valve plate is improved.

According to the invention described in claim 4,
In addition to the effect of the invention described in any one of the above, a plate having a restriction portion for restricting the opening degree of the discharge valve is positioned with respect to the valve body.

In the invention described in claim 5, claims 1 to 4 are provided.
In addition to the operation of the invention described in any one of the above, the fixing member positions and fixes the main body plate and the valve forming plate and the like. According to the invention described in claim 6, in addition to the effect of the invention described in claim 5, it is possible to avoid interference between the head portion of the fixing member and the cylinder block.

According to the invention of claim 7, in addition to the operation of the invention of claim 6, the head of the fixing member and the first recess of the cylinder block engage with each other to position the valve plate. Be seen.

In the invention described in claim 8, claims 5 to 7 are provided.
In addition to the effect of the invention described in any one of the above, interference between the head portion of the fixing member and the housing can be avoided. In the invention described in claim 9, in addition to the effect of the invention described in claim 8, the head portion of the fixing member and the second recessed portion of the housing are engaged with each other to position the valve plate.

According to the tenth aspect of the invention, the fifth to fifth aspects are provided.
In addition to the operation of the invention described in any one of 9 above, positioning and fixing of the main body plate and the valve forming plate and the like are performed by rivets.

According to the eleventh aspect of the invention, in addition to the action of the seventh or ninth aspect of the invention, the cylinder block and the valve plate are positioned more strictly than the housing and the valve plate.

In the invention described in claim 12, claims 5 to 5 are provided.
In addition to the operation of the invention described in any one of 9 above, the main body plate and the valve forming plate are positioned and fixed by the bolts and nuts, and the tightening pressure on the valve plate can be adjusted.

According to the invention described in claim 13,
In addition to the effect of the invention described in any one of 4 above, the pin is press-fitted into the holes of the main body plate and the valve forming plate to integrally fix the entire valve plate.

According to a fourteenth aspect of the present invention, the first to third aspects are provided.
In addition to the effect of the invention described in any one of the above 4, since the fixing means is provided at two or more places, the sealing property between the valve plate body and the valve forming plate and the like is further improved, and the positioning accuracy is also improved.

In the invention described in claim 15, claims 1 to
In addition to the effect of the invention described in any one of 4 and 14, the space in the central portion of the valve plate can be effectively used. According to the sixteenth aspect of the invention, in addition to the action of the invention according to any one of the first to fifteenth aspects, the sealability of the valve plate is improved.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment in which the present invention is embodied in a cam plate type double-headed piston compressor will be described below with reference to FIG.
This will be described in detail with reference to FIG.

As shown in FIG. 1, the front side cylinder block 11 and the rear side cylinder block 12 are joined to each other at the center. Cylinder block 11
A front housing 15 is joined to the front end surface of the cylinder block 12 via a valve plate 13, and a rear housing 16 is joined to the rear end surface of the cylinder block 12 via a valve plate 14. The valve plates 13 and 14 include body plates 17 and 18, and suction valve forming plates 19 having suction valves 19a and 20a on the cylinder blocks 11 and 12 sides of the body plates 17 and 18,
20 are polymerized. Discharge valve forming plates 21 and 22 having discharge valves 21a and 22a are superposed on the housings 15 and 16 of the body plates 17 and 18, respectively. The discharge valves 21a and 22 are provided on the outer side surfaces of the discharge valve forming plates 21 and 22, respectively.
Retainer plates 23 and 24 having restricting portions 23a and 24a for restricting the maximum opening of a are interposed. The retainer plates 23 and 24 have a function of a gasket, and the valve plate 1
It constitutes a part of 3,14. Suction valve forming plates 19, 2
Gaskets 54 and 55 forming part of the valve plates 13 and 14 are sandwiched between 0 and the body plates 17 and 18, respectively.

The cylinder blocks 11 and 12, the valve plate 1
3, 14 and housings 15 and 16 are from the front housing 15 to the cylinder blocks 11 and 12 and the valve plate 13,
A plurality of through bolts 25 penetrating 14 and screwed to the rear housing 16 are fastened and fixed to each other.

Suction chambers 26 and 27 are formed on the outer peripheries of the front housing 15 and the rear housing 16, and discharge chambers 28 and 29 are defined on the center side. A plurality of cylinder bores 11a and 12a are formed through the cylinder blocks 11 and 12 so as to be parallel to each other, and a double-headed piston 30 is inserted inside them. A pair of front and rear compression chambers 31 and 32 are formed in the cylinder bores 11a and 12a. The compression chambers 31, 32 include main body plates 17, 18, a discharge valve forming plate 21,
22, gaskets 54, 55 and retainer plates 23, 24
Through the suction ports 17a and 18a formed in the suction chambers 26 and 27, and the discharge ports 17b and 18b formed in the body plates 17 and 18, suction valve forming plates 19 and 20, and gaskets 54 and 55 in the same manner. Through the discharge chambers 28 and 29. When the double-headed piston 30 is in the suction stroke, the suction valves 19a and 20a are opened to suck the refrigerant from the suction chambers 26 and 27 into the compression chambers 31 and 32. Further, when the double-headed piston 30 is in the discharge stroke, the compressed refrigerant in the compression chambers 31, 32 is discharged by the discharge valves 21a, 2
2a is pushed away and discharged into the discharge chambers 28 and 29.

A crank chamber 33 is formed in the center of each of the cylinder blocks 11 and 12. A drive shaft 34 is rotatably supported by radial bearings 35 in shaft holes 11b, 12b at the center of both cylinder blocks 11, 12. The front valve plate 13 is formed with an insertion hole 13a through which the drive shaft 34 is inserted. A swash plate 36 as a cam plate is fitted and fixed to the intermediate outer peripheral portion of the drive shaft 34. The double-headed piston 30 is moored to the swash plate 36 via shoes 37 and 38, and the double-headed piston 30 is rotated by the rotation of the drive shaft 34 to move the double-headed piston 30 to the cylinder bores 11a ,.
It is reciprocated in 12a.

The boss portion 36a of the swash plate 36 is supported by thrust bearings 39, 40 on both front and rear wall surfaces of the cylinder blocks 11, 12 forming the crank chamber 33.

The crank chamber 33 is communicated with the suction chambers 26, 27 by suction passages 41, 42 formed in the cylinder blocks 11, 12. The crank chamber 33 is connected to the external refrigerant circuit via a suction flange (not shown) formed in the cylinder blocks 11 and 12. further,
The discharge chambers 28, 29 are provided in the cylinder blocks 11, 12
And a discharge passage 43 formed in both housings 15 and 16,
It is connected to the external refrigerant circuit via 44 and a discharge flange (not shown).

An electromagnetic clutch 46 is interposed between the end portion of the drive shaft 34 protruding from the front housing 15 and the support cylinder portion 45 protruding from the front housing 15. The pulley 47 of the electromagnetic clutch 46 is operatively connected to a vehicle engine (not shown) via a belt (not shown). By controlling the excitation / demagnetization of the solenoid 49, the clutch plate 50 is brought into pressure contact with the side plate of the pulley 47, or the pressure contact is released, so that the pulley 47 and the drive shaft 34 are connected or the connection is released. By connecting the pulley 47 and the drive shaft 34, the drive shaft 34 is rotated by the vehicle engine. The terminal 51 of the electromagnetic clutch 46 projects toward the front housing 15 side, and the front housing 15 is formed with a thinned portion 52 so as not to interfere with the terminal 51. The meat stealing portion 52 and the discharge passages 43, 44 are formed on the upper side of the compressor.

Next, the structure of the valve plates 13 and 14 including the intake valve forming plates 19 and 20, the main body plates 17 and 18, the discharge valve forming plates 21 and 22 will be described in detail below. As shown in FIGS. 2 and 3, in the present embodiment, the valve plates 13 and 14 are integrally fastened at two places at their central portions by rivets 53 that form a fixing means and a fixing member. That is, the through holes 61 are formed in the central portions of the main body plates 17 and 18, the gaskets 54 and 55, the suction valve forming plates 19 and 20, the discharge valve forming plates 21 and 22, and the retainer plates 23 and 24. The body portion of the rivet 53 is inserted through the through hole 61, a head portion 53a is integrally formed at one end thereof, and the body portion is partially crushed at the other end to form a crushed head portion 53b. These heads 53a and 53b are the valve plate 1
The outer surface of 3, 14 is tightened. Therefore, the valve plate 1
The plates 17 to 24, 54, and 55 constituting the parts 3 and 14 are closely adhered to each other while being positioned by the rivets 53.

As shown in FIGS. 1 to 3, the head portion 53a of the rivet 53 is in the first recess 57 formed in the cylinder blocks 11 and 12, and the crushing head portion 53b is in the front housing 1.
5 and the second recess 60 formed in the rear housing 16 to avoid interference between the heads 53a and 53b and the cylinder blocks 11 and 12 and the housings 15 and 16, and the valve plates 13 and 14 to The cylinder blocks 11 and 12 and the housings 15 and 16 are positioned.

Here, the arrangement position of the rivet 53 is as follows.
It is decided by the following reasons. That is, in this embodiment, as shown in FIGS. 1 and 2, since the discharge passages 43 and 44 are provided in the upper portions of the cylinder blocks 11 and 12, the arrangement pitch of the through bolts 25 in this portion is the discharge passage 43. , 44 is avoided and it is getting bigger. Therefore, the pressure contact force of the cylinder blocks 11 and 12 and the housings 15 and 16 with respect to the valve plates 13 and 14 in this vicinity is small. For this reason, the sealability between the main body plates 17 and 18 inside the valve plates 13 and 14 and the discharge valve forming plates 21 and 22 at this portion tends to be low, and the discharge of the central portions of the valve plates 13 and 14 tends to be low. Rivets 53 near the passages 43 and 44
Is provided.

Further, in this embodiment, as shown in FIG. 1, a meat-thief portion 52 is provided on the upper portion of the front housing 15 so as not to interfere with the terminal 51 of the electromagnetic clutch 46. Therefore, the rigidity of this portion is low, and the pressing force applied to the front side valve plate 13 by the front housing 15 is small in the upper part in FIG. Therefore, the sealing performance of this portion is lower than that of the other portions, and the sealing performance is improved by fastening the central portion of the valve plate 13 and the portion close to the meat stow portion 52 with the rivet 53 for reinforcement.

Next, when the compressor constructed as described above is assembled, the valve plates 13 and 14 are assembled in advance by the rivets 53 as shown in FIG. When the cylinder blocks 11 and 12 and the housings 15 and 16 are assembled, the valve plates 13 and 14 are attached to the cylinder block 1.
The rivet heads 53a and 53b are positioned between the housings 1 and 12 and the housings 15 and 16 by the engagement of the recesses 57 and 60, and fixed by the through bolts 25.

In this way, the valve plates 13 and 14 that are integrally fastened together in advance are assembled to the compressor body.
At this time, the valve plate 1 for the cylinder blocks 11 and 12
Positioning of 3, 14 is performed by the fitting relationship between the heads 53a, 53b of the rivet 53 and the recesses 57, 60 of the cylinder blocks 11, 12 and the housings 15, 16 as described above, and the positioning work is extremely easy. To be done.

Next, the operation of the compressor configured as described above will be described. When the drive shaft 34 is rotated by an external power source such as a vehicle engine, the crank chamber 3
The swash plate 36 in the cylinder 3 is rotated, and the plurality of double-headed pistons 30 are connected to the cylinder bores 11a and 12a via the shoes 37 and 38.
Is reciprocated within. The refrigerant guided from the suction flange (not shown) to the crank chamber 33 by the movement of the double-headed piston 30 is guided to the suction chambers 26 and 27 from the crank chamber 33 through the suction passages 41 and 42. And the suction chambers 26, 2
The refrigerant in 7 is introduced into the compression chambers 31, 32 through the suction ports 17a, 18a, and is compressed in the compression chambers 31 by the double-headed piston 30. Then, the discharge port 17b,
It is discharged into the discharge chambers 28 and 29 via 18b. further,
The compressed refrigerant in the discharge chambers 28, 29 is discharged in the discharge passages 43, 44.
After that, it is supplied to a condenser, an expansion valve, and an evaporator that form an external refrigerant circuit, and is used for air conditioning in the vehicle compartment.

According to the present embodiment configured as described above, the following excellent effects are obtained. (1) The rivets 53 position the body plates 17, 18 and the suction valve forming plates 19, 20 and the discharge valve forming plates 21, 22. For this reason, those plates are positioned on the cylinder block, but the ports 17a, 18a, 17b, 18b are compared with the conventional configuration in which they are not positioned relative to each other.
The suction valves 19a, 20a and the discharge valves 21a, 22a are accurately positioned. Therefore, the risk of gas leakage is reduced, and the suction valves 19a, 20a and the discharge valves 21a, 2 are reduced.
The contact area between the 2a and the main body plates 17 and 18 can be reduced, and extra processing such as roughening to reduce the contact area is unnecessary.

(2) The valve plates 13 and 14 are the same.
Since the central portion of 14 is integrally fastened with the rivet 53, the sealability inside the valve plates 13 and 14 is improved, and the leakage of the refrigerant due to suction / discharge can be suppressed. Therefore, unlike the conventional configuration in which the sealability of the valve plate is secured only by assembling the cylinder block and the housing, a high level of machining accuracy of the cylinder block and the housing is not required, and these machining can be performed easily. In addition, it is possible to suppress a decrease in cooling efficiency due to recompression of leaked gas. Further, since the gaskets 54, 55 and the retainer plates 23, 24 having a gasket function are press-fitted between the rivet 53 and the valve plates 13, 14, the sealability of the valve plates 13, 14 is further improved. .

(3) When the valve plates 13 and 14 are assembled to the cylinder blocks 11 and 12, etc., the rivet head 53a and the recess 57 are naturally positioned. For this reason, the positioning work of the valve plates 13 and 14 is unnecessary, and the assembling work is extremely easy.

(4) Using the rivets 53, the retainer plate 2
Since 3 and 24 are also positioned on the main body plates 17 and 18, the discharge valves 21a and 22a and the restricting portions 23a and 24a are accurately positioned.

(5) Since the rivet heads 53a and 53b are fitted in the recesses 57 and 60 of the cylinder blocks 11 and 12 and the housings 15 and 16, the rivet heads 53a and 53b are
Although 53b projects on the valve plates 13 and 14, their interference can be prevented.

(6) Since the rivets 53 are provided in the central portions of the valve plates 13 and 14, the portions where the through bolts 25 and the like are not arranged can be effectively used, which contributes to downsizing of the entire compressor.

(7) Since there are a plurality of rivets 53, rotation of the valve forming plates 19, 20 and the like with respect to the main body plates 17, 18 can be suppressed, positioning can be performed accurately, and sealing performance is ensured. It can be carried out.

(8) Since the head portion 53a, which is integrally formed with the body portion of the rivet 53, is fitted to the cylinder block side, the cylinder blocks 11 and 12 and the valve plates 13 and 14 are accurately positioned, and the suction valve Are properly placed in the bore. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 4 focusing on parts different from the first embodiment.

In this embodiment, unlike the first embodiment, the fixing means and the fixing member of the valve plate 14 are constituted by bolts 58 and nuts 59 instead of rivets. In the present embodiment, the nut 59 is assembled so as to be located toward the discharge valve forming plate 22. Further, the foot portion of the bolt 58 is formed so as not to project from the nut 59.

Therefore, in the second embodiment, the heads of the bolts 58 and the nuts 59 are the same as the cylinder blocks 11,
12, the recesses 57 and 60 of the housings 15 and 16 are fitted to perform positioning.

According to the present embodiment configured as described above, the valve plates 13 and 14 can be tightened with the nut 59, so that the tightening strength depends on variations in the accuracy of the valve plates 13 and 14, etc. It can be adjusted freely.

In addition, in the second embodiment, the same operational effect as that of the first embodiment is obtained. The present invention can be modified and embodied as follows. (1) In the first embodiment, the number of rivets 53 is three.
Provide one or more.

(2) In the second embodiment, the bolt 58
-Provide three or more fastening points with the nut 59. When configured as described above, the main body plate 1
The sealability between 7, 18 and the valve forming plates 19-22 is further improved, and the positioning accuracy is further improved.

(3) Embodying the present invention in other piston type compressors, for example, single-head piston type compressors. (4) As the fixing means and the fixing member, use pins which are press-fitted into the holes of the main body plate and the valve forming plate and whose both ends are fitted into the recesses of the cylinder block and the housing.
In this case, heads for tightening the valve plates 13 and 14 on both ends of the pin are not necessarily required.

(5) In each of the above-described embodiments, the intake ports 17a, 18a or the discharge ports 17b, 18b are opened in the inner peripheral surfaces of the cylinder bores 11a, 12a, and the rotary valve is provided substantially coaxially with the drive shaft 34. , The suction ports 17a, 18a or the discharge ports 17b, 18b should be opened and closed.

Even with such a configuration, it is possible to achieve substantially the same effects as those of the above-described embodiments. The technical ideas other than the claims understood from the above embodiments will be described below along with their effects.

(1) The piston type compressor according to claim 15, wherein the fixing means is arranged at a position close to the discharge passage of the cylinder block. According to this structure, it is effective to secure the sealing property of the valve plate.

(2) The piston type compressor according to claim 15 or (1), wherein the fixing means is arranged at a position close to the thin portion of the housing. With this structure, it is effective to secure the sealing property of the valve plate, as in the above.

[0067]

As described above, according to the present invention, the following excellent effects can be obtained. According to the invention described in claims 1, 2, 5, 10 and 17, the valve forming plate and the main body plate are positioned in a state where they are fixed to each other, and the cylinder block and the like need not be processed with high precision. The sealability of the valve plate can be secured, and no extra processing is required, which simplifies manufacturing.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the gasket is fixed to the main body plate by the fixing means. Therefore, the sealing property of the valve plate is further improved.

In the invention described in claim 4, claims 1 to 3 are provided.
In addition to the effects of the invention described in any one of the above, the retainer plate having a restricting portion for restricting the opening degree of the discharge valve is positioned with respect to the valve body, and the positional relationship between the discharge valve and the restricting portion is precisely Can be set.

According to the invention described in claim 6, in addition to the effect of the invention described in claim 5, it is possible to avoid interference between the head of the fixing member and the cylinder block. Claim 7,
In the invention described in claim 9, in addition to the effect of the invention described in claim 6 or 8, the valve plate is positioned by engaging using the head portion of the fixing member, which simplifies the configuration and assembly. Become.

According to the invention described in claim 8, claims 5 to 7 are provided.
In addition to the effects of the invention described in any one of 1, the interference between the head portion of the fixing member and the housing can be avoided. According to the eleventh aspect of the invention, in addition to the effects of the seventh or ninth aspect of the invention, the cylinder block and the valve plate are more accurately positioned, and the suction valve is appropriately arranged in the bore. .

In the twelfth aspect of the present invention, the fifth to fifth aspects are provided.
In addition to the effect of the invention described in any one of 9, the tightening pressure for the valve plate can be set to an optimum value. According to the invention described in claim 13, in addition to the effect of the invention described in any one of claims 1 to 4, the entire valve plate is integrally fixed by the pin.

According to the invention described in claim 14,
In addition to the effect of the invention described in any one of 4 above, since the fixing means is provided at two or more places, the sealability between the main body plate and the valve forming plate and the like is further improved, and the positioning accuracy is also improved.

According to the invention described in claim 15,
In addition to the effect of the invention described in any one of 4 and 14, the space in the central portion of the valve plate can be effectively used, which can contribute to downsizing of the compressor.

According to the sixteenth aspect of the present invention, the first to third aspects are provided.
In addition to the effect of the invention described in any one of 15, it is possible to further improve the sealing property of the valve plate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a compressor of a first embodiment.

FIG. 2 is a partially cutaway side view showing a cylinder block and a valve plate in the compressor of the first embodiment.

FIG. 3 is a cross-sectional view showing (a) a front side valve plate and (b) a rear side valve plate of the first embodiment.

FIG. 4 is a sectional view showing a valve plate according to a second embodiment.

FIG. 5 is a sectional view showing a conventional compressor.

[Explanation of symbols]

11, 12 ... Cylinder block, 11a, 12a ... Cylinder bore, 13, 14 ... Valve plate, 15 ... Front housing, 16 ... Rear housing, 17, 18 ... Body plate constituting valve plate, 17a, 18a ... Intake port, 17b , 18
b ... Discharge port, 19, 20 ... Suction valve forming plate forming valve plate, 19a, 20a ... Suction valve 21, 22 ... Discharge valve forming plate forming valve plate, 21a, 22a ... Discharge valve, 23,
24 ... Retainer plate, 23a, 24a ... Regulation part, 25 ... Through bolt, 26, 27 ... Suction chamber, 28, 29 ... Discharge chamber,
30 ... Double-headed pistons, 31, 32 ... Compression chamber, 33 ... Crank chamber, 34 ... Drive shaft, 36 ... Swash plate as cam plate, 53 ... Rivets as fixing means and fixing member, 53a ... Head, 53b ... Crush Head portion, 54, 55 ... Gasket, 57 ... First concave portion, 58 ... Bolts as fixing means and fixing member, 59 ... Nuts as fixing means and fixing member, 60 ... Second concave portion.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiichi Dedo 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation

Claims (17)

[Claims] 1. A cylinder block having a plurality of cylinder bores, and at least one of a discharge chamber and a suction chamber,
A housing fixedly joined to a cylinder block via a valve plate, a piston accommodated in the cylinder bore, a drive shaft rotatably supported by the cylinder block, and rotation of the drive shaft converted into reciprocating linear motion of the piston. A valve plate having a suction plate and a main body plate having at least one of a suction port for communicating the cylinder bore and the suction chamber and a discharge port for communicating the cylinder bore with the discharge chamber. The plate and at least one of the valve-forming plates provided with a discharge valve are superposed, and the refrigerant gas in the suction chamber is sucked into the cylinder bore by opening the suction valve with the reciprocating movement of the piston, and the discharge valve is opened. In the piston type compressor in which the refrigerant gas in the cylinder bore is discharged to the discharge chamber by the valve forming plate with respect to the main body plate, Fixing means for fixing the piston type compressor is provided between the main plate and the valve forming plate. 2. The valve plate according to claim 1, wherein the valve plate comprises a main body plate, a suction valve forming plate having suction valves formed on both sides of the main body plate, and a discharge valve forming plate having a discharge valve. Piston type compressor. 3. The piston type compressor according to claim 1, wherein the valve plate includes a gasket, and the fixing means fixes the gasket to the body plate. 4. The valve plate includes a retainer plate having a restricting portion for restricting the opening of the discharge valve, and the fixing means fixes the retainer plate to the main body plate. The piston type compressor described in. 5. The fixing means is constituted by a fixing member having a body portion penetrating the valve plate and head portions provided at both ends of the body portion for tightening an outer side surface of the valve plate. The piston type compressor according to any one of 1. 6. The piston type compressor according to claim 5, wherein the cylinder block has a first recess for accommodating a head portion of the fixing member. 7. The piston type compressor according to claim 6, wherein the valve plate is positioned by engagement between the head portion and the first recess. 8. The piston type compressor according to claim 5, wherein the housing has a second recess for accommodating the head of the fixing member. 9. The piston type compressor according to claim 8, wherein the valve plate is positioned by engagement between the head portion and the second recess. 10. The fixing member is composed of a rivet, and both ends of the rivet form heads.
The piston type compressor according to any one of 1. 11. The piston type compressor according to claim 7, wherein the fixing member is formed by a rivet, and a crushing head portion of the rivet is arranged on the housing side. 12. The fixing member comprises a bolt and a nut, and the bolt head and the nut constitute a head.
The piston type compressor according to any one of to 9. 13. The piston type compressor according to claim 1, wherein the fixing means comprises a pin press-fitted into a hole of the valve plate. 14. The piston type compressor according to claim 1, wherein the fixing means is provided at two or more positions on the valve plate. 15. The piston type compressor according to claim 1, wherein the fixing means is arranged at a central portion of the valve plate. 16. The cylinder block and the housing are tightened and fixed by bolts which penetrate the cylinder block and are screwed to the housing, and fixing means for fixing the valve plate are arranged apart from the position of the bolts. Item 1
16. The piston type compressor according to any one of to 15. 17. A cylinder block having a plurality of cylinder bores, a housing having a discharge chamber and a suction chamber, joined and fixed to the cylinder block via a valve plate, a piston housed in the cylinder bore, and a cylinder block. A rotatably supported drive shaft, and a cam plate for converting the rotation of the drive shaft into a reciprocating linear motion of a piston. The valve plate is connected to a suction port, a cylinder bore, and a discharge port. The main body plate having at least one of the discharge ports communicating with the chamber is superposed with at least one of the valve forming plate having the suction valve and the valve forming plate having the discharge valve. , The refrigerant gas in the suction chamber is sucked into the cylinder bore by opening the suction valve, and the cylinder bore by opening the discharge valve. In the piston type compressor in which the refrigerant gas is discharged into the discharge chamber, the method for assembling the piston type compressor, wherein after fixing the valve forming plate to the main body plate, the valve plate is assembled between the cylinder block and the housing. .