JPH0744765Y2 - Swash plate type compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a swash plate compressor, and more particularly to a refrigerant gas suction structure.

[Prior Art] In a swash plate compressor, a swash plate provided on a drive shaft is swung in a swash plate chamber based on the rotation of the drive shaft, and a piston provided in a cylinder bore reciprocates with the swing. The refrigerant gas is moved and thereby sucked into the swash plate chamber from the external cooling circuit through one suction hole that opens to the swash plate chamber, and is guided from the swash plate chamber to the suction chamber through the suction passage, and the suction is performed. From the chamber, it is introduced into each cylinder bore through the suction port, compressed in each cylinder bore, and then discharged to the external cooling circuit.

[Problems to be Solved by the Invention] However, in the conventional configuration, since one suction hole is provided so as to open to the outer periphery of one side of the swash plate chamber, the swash plate swings due to the rotation of the drive shaft. As a result, the suction hole is temporarily blocked by the outer periphery of the swash plate, and the refrigerant gas is not smoothly sucked into the swash plate chamber.As a result, the introduction of the refrigerant gas from the swash plate chamber into each suction passage is unsuccessful. It becomes uniform, the introduction of the refrigerant gas from each suction passage into the suction chamber is also non-uniform, and the amount of the refrigerant gas introduced into each of the plurality of cylinder bores from the suction chamber through each of the suction ports is also among the plurality of cylinder bores. In the cylinder bores separated from the suction holes, the refrigerant gas is not sufficiently introduced and the pressure becomes low, and the suction and compression operation of the refrigerant gas is not efficiently performed, and the lubrication by the mist-like oil contained in the refrigerant gas is sufficient. If it is not performed, there is a problem that poor lubrication occurs.

This invention was made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is that the refrigerant gas can be introduced into the plurality of cylinder bores almost uniformly. An object of the present invention is to provide a swash plate compressor capable of efficiently performing a suction compression operation of a refrigerant gas in each cylinder bore and reliably preventing a possibility of poor lubrication.

[Means for Solving the Problems] In order to achieve the above object, in the swash plate compressor of the present invention, a plurality of suction holes for sucking a refrigerant gas are provided in the swash plate chamber, and the suction holes are provided. The swash plate is arranged not at the same time as the outer circumference of the swash plate but at a position that divides the circumference about the drive shaft into substantially equal parts.

[Operation] In the swash plate compressor configured as described above, when the swash plate is swung based on the rotation of the drive shaft and the piston is reciprocated, the refrigerant gas flows from the external cooling circuit through the suction hole. The air is sucked into the swash plate chamber, introduced into the cylinder bore from the swash plate chamber through the suction passage, compressed in the cylinder bore, and then discharged to the external cooling circuit. And
In this swash plate compressor, a plurality of suction holes are provided at positions that divide the circumference about the drive shaft into substantially equal parts, and at positions that are not simultaneously blocked by the outer circumference of the swash plate when the swash plate swings. Therefore, when one intake hole is blocked by the swash plate,
Gas is introduced into the shielded chamber from another suction hole that is farthest from the suction hole, so that the refrigerant gas is smoothly introduced into each of the plurality of suction passages, and the refrigerant is evenly distributed from the suction chamber to each cylinder bore. be introduced.

[Embodiment] A first embodiment of a swash plate compressor embodying the present invention will be described below in detail with reference to FIGS. 1 and 2.

By the way, FIG. 2 shows a swash plate type compressor having five cylinders on each side, that is, a total of 10 cylinders.
Both ends of 1, 2 are closed by front and rear housings 5, 6 via front and rear valve plates 3, 4, and these are joined by a plurality of bolts 7 inserted into bolt insertion holes 1a, 2a. There is. A swash plate chamber 8 is formed at the connecting portion of the cylinder blocks 1 and 2, and both cylinder blocks are formed there.
A swash plate 10 fixed to a drive shaft 9 penetrating through the central axial holes 1b and 2b of 1 and 2 is housed.

As shown in FIGS. 1 and 2, the cylinder block
Five pairs of cylinder bores 11 are formed in the cylinders 1 and 2 in parallel with the drive shaft 9 at radial positions about the drive shaft 9, and a double-headed piston 12 is inserted into each cylinder bore 11. Each piston 12 is moored to the swash plate 10 via a hemispherical shoe 13 as a bearing device, and is reciprocated in the cylinder bore 11 by the swing of the swash plate 10 accompanying the rotation of the shaft.

Suction chambers 14 and 15 are formed in the front and rear housings 5 and 6 on the center side, and discharge chambers 16 and 17 are formed on the outer peripheral side. In addition, the valve plates 3 and 4 have suction ports 18 and 19 for sucking the refrigerant gas G into the cylinder bores 11 from the suction chambers 14 and 15, respectively, and the cylinder bores 1 and 4.
Discharge ports 20 and 21 for discharging the compressed refrigerant gas G from 1 to the discharge chambers 16 and 17 are formed. In addition, the intake valve mechanism is installed on the side of the cylinder blocks 1 and 2 of the valve plates 3 and 4.
22,23 are provided, housing 5,6 of valve plates 3,4
Discharge valve mechanisms 24 and 25 are provided on the side.

A discharge portion 26 for sucking and discharging the refrigerant gas G is provided in the upper portion of the rear cylinder block 2, and a discharge passage 27 communicating with the discharge chambers 16 and 17 is formed in the discharge portion 26. Two suction holes 28 that open to the swash plate chamber 8 are formed on the outer circumferences of the discharge part 26 and the cylinder block 2, and the circumferences of the swash plate 10 and the drive shaft 9 do not face each other. It is arranged in a position that divides the halves.

A lid 29 is attached on the protrusion 26, and a discharge pipe 30 for connecting the discharge passage 27 and an external cooling circuit (not shown) is provided on the upper surface of the lid 29. A bifurcated branch portion of a suction pipe 31 is detachably attached to both suction holes 28 by a nut 32, and both suction holes 28 are connected to an external cooling circuit via the suction pipe 31.

Cylinder bores 11 in both cylinder blocks 1 and 2
Five suction passages 33, 34 are formed between the two spaces, and the swash plate chamber 8 and the suction chambers 14, 15 communicate with each other through the suction passages 33, 34. The refrigerant gas G sucked into the swash plate chamber 8 from the external cooling circuit through the suction pipe 31 and the suction hole 28.
Are introduced into the suction chambers 14, 15 through the suction passages 33, 34.

In addition, in this embodiment, as shown in FIG.
Is not facing the outer circumference of the piston 12, the swash plate chamber 8
Is formed so as to open inward, and the swash plate chamber 8 is provided from each suction hole 28.
The refrigerant gas G sucked in is prevented from directly hitting the outer circumference of the piston 12.

Next, the operation of the swash plate compressor configured as described above will be described.

Now, when the swash plate 10 is rotated by the rotation of the drive shaft 9, each piston 12 is reciprocated in the cylinder bore 11 in the left-right direction in FIG. 2, whereby the refrigerant gas G is sucked, compressed and discharged. .

When the swash plate 10 is swung by the rotation of the drive shaft 9, each piston 12 is reciprocated in the cylinder bore 11 in the left-right direction in FIG. As a result, the refrigerant gas G flows from the external cooling circuit through the suction pipe 31 and the suction hole 28 into the swash plate chamber 8
Is sucked into the inside of the swash plate chamber 8 and the suction passages 33, 3
4, it is introduced into each cylinder bore 11 through the suction chambers 14 and 15 and the suction ports 18 and 19. Then, the refrigerant gas G is compressed in the cylinder bore 11 and then discharged to the external cooling circuit through the discharge ports 20 and 21, the discharge chambers 16 and 17, the discharge passage 27 and the discharge pipe 30.

In the swash plate type compressor of this embodiment, as described above,
When the swash plate 10 swings in accordance with the rotation of the drive shaft 9, the two suction holes 28 are located at positions that divide the circumference about the drive shaft 9 into substantially equal parts. It is provided at a position where it is not blocked by the outer circumference at the same time. Therefore, one suction hole
When 28 is blocked, gas is introduced into the swash plate chamber 8 from a suction hole 28 different from the suction hole, and as a result, refrigerant gas is uniformly supplied from the swash plate chamber 8 to the five pairs of suction passages 34, respectively. Further, the refrigerant gas G is evenly introduced from the suction chambers 14 and 15 into the five pairs of cylinder bores 11, the suction compression operation of the refrigerant gas G is efficiently performed in each cylinder bore 11, and the mist-like gas contained in the refrigerant gas G is formed. This oil effectively lubricates moving parts such as the piston 12.

[Another Embodiment] Next, a second embodiment of the present invention will be described with reference to FIG.

Now, in this embodiment, three suction holes 28 that open to the swash plate chamber 8 are formed in the protrusion 26 and the outer periphery of the cylinder block 2, respectively, and at positions that do not face the outer periphery of the swash plate 10 at the same time.
In addition, it is arranged at a position that divides the circumference around the drive shaft 9 into approximately three equal parts. The suction pipe 31 is provided in each suction hole 28.
The trifurcated branch part of is detachably attached by the nut 32,
Each suction hole 28 is connected to the external cooling circuit via this suction pipe 31.

Therefore, in this second embodiment, the refrigerant gas G is introduced more evenly from the suction holes 28 adjacent to the five pairs of suction passages 34, and therefore, the suction compression operation of the refrigerant gas G is efficient in each cylinder bore 11. The mist-like oil contained in the refrigerant gas G effectively lubricates the movable parts such as the piston 12 as well.

Next, a third embodiment of the present invention will be described with reference to FIG.

Now, in this embodiment, two suction holes 28 that open to the swash plate chamber 8 are formed in the protrusion 26 and the outer periphery of the cylinder block 2, respectively, and at positions that do not oppose at the same time as the outer periphery of the swash plate 10,
Further, it is arranged at a position that divides the circumference around the drive shaft 9 into two substantially equal parts. A communication passage 35 is integrally formed on the outer periphery of the cylinder block 2 between the suction holes 28, and the suction holes 28 are connected to the suction pipe 31 on the lid pair 29 via the communication passage 35.
Is in communication with.

Therefore, also in the third embodiment, as in the first embodiment described above, the refrigerant gas G is introduced into the five pairs of suction passages 34 from the suction holes 28 adjacent to each other almost evenly, and each cylinder bore
In 11, the suction and compression operation of the refrigerant gas G is efficiently performed, and the mist-like oil contained in the refrigerant gas G effectively lubricates the movable portion such as the piston 12. Further, in this embodiment, since the communication passage 35 for communicating the both suction holes 28 is integrally formed on the outer peripheral surface of the cylinder block 2, the piping mechanism can be simplified and the entire compressor can be constructed. It can be miniaturized.

[Effect of the Invention] Since the present invention is configured as described above,
Refrigerant gas containing mist-like lubricating oil is supplied from the suction holes into the swash plate chamber almost evenly without any pressure difference between the parts inside the swash plate chamber, and a plurality of suction passages are formed from the swash plate chamber. The refrigerant gas can be introduced into the suction chamber substantially evenly via the suction chamber, and the refrigerant gas can be introduced into the cylinder bores from the suction chamber almost uniformly through the suction port, and the suction and compression operation of the refrigerant gas can be efficiently performed in each cylinder bore. It has an excellent effect that it can be carried out in a desired manner and the risk of poor lubrication can be surely prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a swash plate type compressor embodying the present invention, FIG. 2 is a longitudinal sectional view of the same swash plate type compressor, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a sectional view of an essential part showing an example, and FIG. 4 is a sectional view of an essential part showing a third embodiment of the present invention. 8 ... swash plate chamber, 9 ... drive shaft, 10 ... swash plate, 11 ... cylinder bore, 12 ... piston, 28 ... suction hole.

Claims (1)

[Scope of utility model registration request] 1. A swash plate provided on the drive shaft is oscillated in the swash plate chamber based on the rotation of the drive shaft, and a piston provided in the cylinder bore is reciprocally moved with the swash plate, whereby lubricating oil is provided. The refrigerant gas containing the is sucked into the swash plate chamber from the external cooling circuit through the suction hole that opens to the swash plate chamber, and is introduced from the swash plate chamber into the cylinder bore through the plurality of suction passages and the suction chambers. In a swash plate type compressor configured to be discharged to an external cooling circuit after being compressed, a plurality of the suction holes are provided, and the suction holes are at a position that does not face the outer periphery of the swash plate at the same time and the drive is performed. A swash plate type compressor placed at positions that divide the circumference about the axis into approximately equal parts.