JPH04365979A - Swash plate compressor - Google Patents

Abstract

PURPOSE:To omit retainer body gasket by improving durability of a swash plate compressor and by achieving ultimate compactness. CONSTITUTION:An annular discharging chamber 10 which has a discharging port 10b communicating to each bore 14 on the outer wall, and a regulated surface 10a on the inner wall, is formed on a housing 6. A banded annular discharging valve 5 which opens/closes the discharging port 10b in response to the difference in pressures between the annular discharging chamber 10 and each bore 14 is fitted into the annular discharging chamber 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a swash plate compressor suitable for use in vehicle air conditioning.

0002

[Prior Art] As a conventional swash plate compressor,
The one described in JP-A-108008 is known. In this swash plate compressor, a pair of cylinder blocks are arranged opposite each other in the front and back, and a swash plate chamber communicating with a return refrigerant suction port is formed at the joint portion. As shown in the front side in FIG. 9, the cylinder block 90 has both outer ends connected to suction valve plates 9, respectively.
1. It is closed by a housing 95 via a gate valve plate 92, a discharge valve plate 93, and a retainer integrated gasket 94. The housing 95 is formed with a suction chamber 95a and a discharge chamber 95b that communicate with a swash plate chamber (not shown).
5b communicates with a discharge port (not shown) that discharges the discharged refrigerant. A drive shaft 96 is inserted into and supported in a common center shaft hole of each cylinder block, and a swash plate (not shown) fixed to this drive shaft 96 is rotatably housed in a swash plate chamber. Further, the cylinder block 90 is formed with a plurality of pairs of front and rear bores 90a arranged in parallel around the drive shaft 96.
A double-headed piston 97, which is moored to the swash plate via a shoe (not shown), is fitted into each bore 90a so as to be movable in a linear manner. Suction ports 94a and 92a are formed in the retainer integrated gasket 94 and the gate valve plate 92, and the suction chamber 95a is connected to each bore 90a by the suction ports 94a and 92a via the reed type suction valve portion 91a of the suction valve plate 91. communicated. Further, discharge ports 91b and 92b are formed in the suction valve plate 91 and the gate valve plate 92, and each bore 90
a is communicated with a discharge chamber 95b through a reed-type discharge valve portion 93a of a discharge valve plate 93 and discharge ports 91b and 92b. A plurality of suction passages (not shown) communicating between the swash plate chamber and the suction chamber 95a of each housing 95 are formed on the inner circumferential side of each cylinder block 90, and on the outer circumferential side of each cylinder block 90, A single discharge passage (not shown) is formed that communicates one discharge chamber 95b with the other discharge chamber.

In this swash plate compressor, return refrigerant is introduced into the swash plate chamber from the refrigeration circuit through the suction port, and the return refrigerant in the swash plate chamber is led to the front and rear suction chambers 95a through each suction passage. The rotation of the drive shaft 96 causes the pistons 97 to move linearly within each bore 90a via the swash plate. At this time, the return refrigerant in each suction chamber 95a is
The cylinder block 90 is opened at a regulated opening degree by the notch 90b, and is sucked into the bore 90a, which is in the process of expanding in volume, through the suction ports 94a and 92a. At the same time, the discharge valve plate 9
The reed type discharge valve part 93a of No. 3 is attached to the edge of the discharge port 92b of the gate valve plate 92 due to the high pressure in the discharge chamber 95a, the low pressure in the bore 90a, and the return force of the reed type discharge valve part 93a. seated, bore 90a and discharge chamber 95b
Close communication with. After this, each bore 90 is in the process of reducing its volume.
The compressed refrigerant in a is discharged from the discharge ports 91a and 92b into the front and rear discharge chambers 95b by opening the reed discharge valve portion 93a at an opening regulated by the retainer-integrated gasket 94. At the same time, the reed-type suction valve portion 91a of the suction valve plate 91
is seated on the edge of the suction port 92a of the gate valve plate 92 due to the low pressure in the suction chamber 95a, the high pressure in the bore 90a, and the return force of the reed type suction valve portion 91a,
Communication between suction chamber 95a and bore 90a is closed. After the refrigerant gas is compressed in this way, one discharge chamber 95b
The compressed refrigerant inside is collected in the other discharge chamber via the discharge passage, and the compressed refrigerant in the other discharge chamber is discharged from the discharge port to the refrigeration circuit and circulated back to the refrigeration circuit.

0004

However, in the conventional swash plate compressor described above, when the compressed refrigerant is discharged from each bore 90a to the discharge chamber 95b, the compressed refrigerant is held between the cylinder block 90 and the housing 95. The retainer-integrated gasket 94 is pressed by the discharge valve portion 93a. Therefore, if such a state occurs frequently and continuously due to high-speed rotation of the drive shaft 96, the retainer-integrated gasket 94 may become fatigued, which may impair the durability of the swash plate compressor.

Further, in this swash plate type compressor, a retainer-integrated gasket 94 and a gate valve plate 92 are respectively interposed between the front and rear housings and the cylinder block to perform a compression action. Therefore, in this swash plate compressor, the two retainer-integrated gaskets 94 and the gate valve plate 92 occupy a considerable amount of weight. Therefore, this swash plate compressor may not be able to meet the recent demands for smaller size and lighter weight.

[0006] The present invention aims to improve the durability of a swash plate compressor and to make it ultimately more compact, and the problem to be solved is to omit the retainer-integrated gasket.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the swash plate compressor of the present invention has an annular discharge port in the housing having a discharge port communicating with each bore on the outer wall and a regulating surface on the inner wall. A band-shaped discharge valve is fitted into the annular discharge chamber so as to open and close the discharge port in response to the pressure difference between the annular discharge chamber and each of the bores, while being in contact with the outer wall. We are using new methods.

[0008]

[Operation] In the swash plate compressor of the present invention, the band-shaped discharge valve is fitted into the annular discharge chamber so as to be in contact with the outer wall thereof, and is seated so as to be able to freely open and close the discharge port of the outer wall. When the pressure in the bore increases, the opening degree of the portion of the annular discharge valve that faces the discharge port that communicates with the bore is regulated by the regulating surface of the inner wall and is pushed open. Therefore, when discharging compressed refrigerant from each bore to the annular discharge chamber, the band annular discharge valve only presses the regulating surface of the annular discharge chamber formed in the housing, and presses the retainer-integrated gasket unlike the conventional one. do not. Therefore, the durability of the swash plate compressor is not impaired even by frequent and continuous pressing.

Furthermore, in this swash plate compressor, since the retainer-integrated gasket is not interposed at the front and rear, the axial length is shortened by twice the wall thickness of the retainer-integrated gasket, resulting in a smaller size, which reduces the number of parts. It is also reduced in size and weight.

0010

[Embodiments] Hereinafter, embodiments 1 and 2 embodying the present invention will be explained with reference to the drawings. (Example 1) As shown in FIG. 1, this swash plate compressor has the following features:
A pair of cylinder blocks 1a and 1b are arranged opposite each other in the front and rear, and a swash plate chamber 3 communicating with a return refrigerant suction port 2 is formed at the joint portion. Each cylinder block 1a, 1b has both outer ends connected to the front housing 6 via the suction valve plate 4.
and is closed by the rear housing 7. The front housing 6 and the rear housing 7 both have suction chambers 8 and 9 formed on their outer peripheral sides. As shown in FIG. 3, each suction chamber 8, 9 is isolated from each bore 14, which will be described later, by edges 8a, 9a, and has suction ports 8b, 9b that communicate internally.
have. Furthermore, as a characteristic feature of this swash plate compressor, both housings 6 and 7 have annular discharge chambers 10 and 11 formed on their inner circumferential sides, as shown in FIG. 2 as well. The annular discharge chambers 10, 11 have discharge ports 10b, 11b on their outer walls that communicate with respective bores 14, which will be described later, and annular ribs on their inner walls serve as regulating surfaces 10a, 11a. The annular discharge chamber 10 on the front side is communicated with a discharge passage 19 that sends the discharged refrigerant to the annular discharge chamber 11 on the rear side, and the annular discharge chamber 11 on the rear side is communicated with a discharge port (not shown).

As shown in FIG. 1, a drive shaft 12 is inserted into the common central shaft hole of each cylinder block 1a, 1b via a radial bearing, and this drive shaft 12 is connected to the front intake valve plate. 4 and is supported by the front housing 6. A swash plate 13 is fixed to the drive shaft 12 so as to be rotatable within the swash plate chamber 3, and this swash plate 13 is supported by each cylinder block 1a, 1b via a thrust bearing. In addition, each cylinder block 1a, 1b has a drive shaft 1.
Five pairs of front and rear bores 14 arranged in parallel around the swash plate 13 are formed in each bore 14.
A double-headed piston 16, which is moored through the piston, is inserted so as to be movable in a linear manner.

A swash plate chamber 3 and front and rear housings 6 are provided on the outer peripheral side of each cylinder block 1a, 1b.
A plurality of suction passages 17 communicating with the respective suction chambers 8 and 9 of the suction chambers 8 and 7 are formed by enclosing through bolts 18 therein. Furthermore, one discharge passage 19 is formed between the two suction passages 17 in each cylinder block 1a, 1b, and communicates with the annular discharge chambers 10, 11 of the front and rear housings 6, 7, respectively.

As shown in FIG. 4, the suction valve plate 4 has five reed-type suction valve sections 41, the same number of discharge ports 42 communicating with the bore 14, and a suction passage hole 43 aligned with the suction passage 17. , a discharge passage hole 44 aligned with the discharge passage 19 (FIG.
) are formed. As another characteristic configuration of this swash plate compressor, a band annular discharge valve 5 is provided in the annular discharge chamber 10, as shown in FIGS.
It is inserted in a state where it is in contact with the outer wall of No. 1. As shown in FIG. 5, the belt-shaped discharge valve 5 has a reed-type discharge valve portion 51 that covers the discharge port 10b and has its head facing the discharge passage hole 44 and the discharge passage 19. Further, both ends 5a of this belt-shaped discharge valve 5 are engaged with both ends 6a of a rib of the front housing 6, so that rotation thereof is restricted. As shown in FIG. 6, this band annular discharge valve 5 has an annular discharge valve section in which each lead type discharge valve part 51 is seated on the edge of each discharge port 10b to close communication between the bore 14 and the annular discharge chamber 10. room 10
equipped inside.

Further, as shown in FIGS. 1 and 3, a notch 20 is formed on the outer peripheral side of the end of the bore 14 in the cylinder block 1a for regulating the opening degree of the reed-type suction valve portion 41. In this way, in this swash plate compressor, the cylinder block 1
Only the suction valve plate 4 is sandwiched between the front housing 6 and the front housing 6, and the gate valve plate, retainer-integrated gasket, and discharge valve plate are not sandwiched as in the conventional case. Suction valve plate 4 between cylinder block 1b and rear housing 7
, the annular discharge valve 5, the cylinder block 1b, and the rear housing 7.

In this swash plate compressor, return refrigerant is introduced into the swash plate chamber 3 from a refrigeration circuit (not shown) through the suction port 2, and the return refrigerant in the swash plate chamber 3 is passed through each suction passage 17 to the front and rear suction chambers. I am led to 8 and 9. The rotation of the drive shaft 12 causes each piston 16 to move linearly within each bore 14 via the swash plate 13 . At this time, in this swash plate compressor, the return refrigerant in each suction chamber 8, 9 is reduced in pressure in the bore 14.
The suction valve portion 41 of the suction valve plate 4 is opened at an opening regulated by the notch 20 of the cylinder block 1a, and the suction port 8b is opened.
It is sucked into the bore 14, which is in the process of expanding its volume. at the same time,
The band annular discharge valve 5 discharges in the outer circumferential direction of the annular discharge chambers 10 and 11 due to the pressure drop in the bore 14, the high pressure in the annular discharge chambers 10 and 11, and the urging force of the band annular discharge valve 5 itself. It seats on the edge of port 10b and closes communication between bore 14 and annular discharge chambers 10, 11.

After that, the bore 1 is opened by the direct movement of the piston 16.
4, the compressed refrigerant in each bore 14 whose volume is being reduced is regulated by the reed-type discharge valve portion 51 of the band-shaped discharge valve 5 by the regulation surface 10a of the ring-shaped discharge chamber 10, as shown in FIG. The discharge port 10b is opened to the opening degree and discharged from the discharge port 10b into the annular discharge chambers 10 and 11 at the front and rear. At the same time, due to the pressure increase in the bore 14, the low pressure in the suction chambers 8 and 9, and the elastic force of the suction valve plate 4, the reed type suction valve part 41 is seated on the edge of the suction port 8b, and the suction chamber 8, 9 and the bore 14 are closed.

The compressed refrigerant in the annular discharge chamber 10 on the front side is collected from the discharge passage 19 into the annular discharge chamber 11 on the rear side, and the compressed refrigerant in the annular discharge chamber 11 on the rear side enters the refrigeration circuit from the discharge port. It is discharged and circulated through the refrigeration circuit again. During these suction and compression stages, in this swash plate compressor, about three out of five bores 14 are in the suction stage, so the pressure in the bores 14 decreases and the pressure in the annular discharge chambers 10 and 11 increases. , the band annular discharge valve 5 is an annular discharge chamber 10,
11, the annular belt-shaped discharge valve 5 is fitted into the discharge ports 10b and 1 of the outer wall.
It is seated on the edge of 1b. For this reason, the band annular discharge valve 5
The bore 14 in the suction stage of the reed-type discharge valve part 51 of
Those that face it are in a closed state. On the other hand, the bore 1 in the reed-type discharge valve portion 51 of the band-shaped discharge valve 5 is in the discharge stage.
4 is opened at a regulated opening degree by pressing the regulating surface 10a of the inner wall of the annular discharge chamber 10 with a relatively weak elastic force. Therefore, from each bore 14 to the annular discharge chamber 10
, 11, the annular band discharge valve 5 only presses the regulating surfaces 10a, 11a of the annular discharge chambers 10, 11 formed in the housings 6, 7, and is not integrated with a retainer as in the conventional case. Do not press the gasket. Therefore, the durability of the swash plate compressor is not impaired even by frequent and continuous pressing.

Furthermore, in this swash plate compressor, the band-shaped discharge valve 5 responds with an elastic force that is weaker than that of the conventional compressor, so that power loss is reduced. Furthermore, in this swash plate type compressor, the outer wall of the annular discharge chamber 10 is a cylindrical surface, and the band annular discharge valve 5 is seated on this cylindrical surface. than that of the band annular discharge valve 5
can receive the discharge pressure suitably with small stress, and the rigidity of the band-shaped discharge valve 5 is increased so that even a thin-walled discharge valve can be used. In addition, in this swash plate compressor, the annular discharge chamber 1
Since the belt annular discharge valve 5 is equipped in the 0, even if there are multiple cylinders, only a single belt annular discharge valve 5 can be installed.Therefore, there is no increase in the number of parts, and a rise in product costs can be avoided. Does not occur.

Furthermore, in this swash plate compressor, the reed type discharge valve portion 51 of the belt annular discharge valve 5 is regulated by the regulating surfaces 10a and 11a of the annular discharge chambers 10 and 11 of the front and rear housings 6 and 7, respectively. Since the gate valve plate and the retainer-integrated gasket are not interposed in the front and back, the axial length is shortened by twice the total wall thickness of the gate valve plate and the retainer-integrated gasket, resulting in a smaller size. This reduces the number of parts and makes it lighter. Since this swash plate compressor does not include a gate valve plate, the dead space generated by the discharge port of the gate valve plate can be reduced, and the volumetric efficiency can be improved.

[0020] Therefore, in such a swash plate compressor, by omitting the retainer-integrated gasket, it is possible to improve durability and achieve ultimate compactness, and it can be used for a long period of time under suitable cooling capacity. It is possible to achieve excellent driving performance by reducing power loss, and by being smaller and lighter, it is easier to mount on vehicles, etc., and by reducing the number of parts, product costs are lowered. can also be realized.

In this swash plate compressor, since the reed-type discharge valve portion 51 of the band-shaped discharge valve 5 is formed with its head facing the discharge passage 19 and the discharge passage hole 44, the band-shaped discharge valve 5 The width has become narrower, and the axial direction has been reduced. (Example 2) This swash plate compressor has the following features as shown in FIG.
Thin-wall continuous band annular discharge valve 30 without a reed-type discharge valve part
was adopted. This band-shaped discharge valve 30 does not have both ends that restrict rotation, and is provided with a protrusion 31 that forms a gap with the side surface of the ring-shaped discharge chamber 10 . As shown in FIG. 8, the annular discharge valve 30 is seated on the edge of the discharge port 10b and is in contact with the outer wall of the annular discharge chamber in order to close the communication between the bore 14 and the annular discharge chamber 10. It is fitted in 10. The other configurations are the same as those in Example 1, so detailed description will be omitted.

In this swash plate compressor, the portion facing the bore 14 in the suction stage is seated on the edge of the discharge port 10b, and the portion 30 facing the bore 14 in the discharge stage is seated on the edge of the discharge port 10b.
A is slightly raised by a weak elastic force from other parts that are in contact with the outer peripheral surface of the annular discharge chamber 10, and is opened at an opening regulated by the regulating surface 10a of the annular discharge chamber 10. Therefore, in this swash plate compressor, the same functions and effects as in the first embodiment can be obtained, and since the band-shaped discharge valve 30 has a relatively simple shape, the product cost can also be reduced. Can be done.

[0023] In addition, in order to make it easier for other parts of the annular discharge valve 30 to sit on the edge of the discharge port 10b when the part facing the bore 14 in the discharge stage bulges,
A regulating protrusion may also be formed from the inner peripheral surface at the boundary between adjacent bores 14 in the annular discharge chamber 10. In this case, re-expansion can be reliably prevented and volumetric efficiency can be improved.

Furthermore, in the first and second embodiments described above, the suction valve plate 4
are seated in the housings 6, 7, but it is also possible to interpose a gate valve plate between the suction valve plate 4 and the housings 6, 7.

[0025]

As described in detail above, in the swash plate compressor of the present invention, an annular discharge chamber is formed which has a discharge port communicating with each bore on the outer wall and a regulating surface on the inner wall. A belt-shaped discharge valve that opens and closes the discharge port in response to the differential pressure between the discharge chamber and each bore is fitted in the valve in contact with the outer wall, resulting in improved durability, smaller size, and lighter weight. can be realized simultaneously.

[0026] Therefore, this swash plate compressor can be used for a long period of time due to its improved durability, and can be more easily mounted on a vehicle due to its size and weight reduction.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a swash plate compressor according to a first embodiment.

[Fig. 2] Regarding the swash plate compressor of Example 1, A-A in Fig. 1
FIG.

FIG. 3 is a vertical cross-sectional view of a main part of the swash plate compressor of Example 1.

4 is a plan view of a suction valve plate in the swash plate compressor of Example 1. FIG.

5 is a plan view of a band-shaped discharge valve in the swash plate compressor of Example 1. FIG.

FIG. 6 is a cross-sectional view of essential parts of the swash plate compressor of Example 1.

FIG. 7 is a perspective view of a band-shaped discharge valve in a swash plate compressor according to a second embodiment.

FIG. 8 is a cross-sectional view of a main part of a swash plate compressor according to a second embodiment.

FIG. 9 is a vertical cross-sectional view of a main part of a conventional swash plate compressor.

[Explanation of symbols]

Claims (1)

[Claims] 1. A cylinder block in which a plurality of bores are formed and a swash plate chamber communicating with an inlet, front and rear housings respectively closing both outer ends of the cylinder block, and a central axis of the cylinder block. a drive shaft inserted and supported in the hole; a swash plate fixed to the drive shaft and rotatably housed in the swash plate chamber; Equipped with a double-headed piston that
In a swash plate compressor that sucks return refrigerant from a suction valve into each bore through the swash plate chamber and discharges compressed refrigerant from each bore, the housing has a discharge port on an outer wall communicating with each bore. An annular discharge chamber is formed with a regulating surface on an inner wall, and a band annular discharge valve that opens and closes the discharge port in response to a pressure difference between the annular discharge chamber and each of the bores is formed in the annular discharge chamber. A swash plate type compressor, characterized in that the compressor is fitted in a state in which it is in contact with the outer wall.