JPH11241679A - Swash plate compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably supply lubricating oil in an oil sump to a sliding part without using an oil pump. SOLUTION: A lubricating oil supply path 33 supplying lubricating oil O of an oil sump 34 to the halfway of a low pressure gas suction passage 32 is provided on a cylinder block 60. Because low pressure gas within the low pressure gas suction passage 32 flows to the side of a swash plate storing chamber and pressure of the low pressure gas suction passage 32 lowers, lubricating oil O of the oil reservoir chamber 34 is supplied to the halfway of the low pressure gas suction passage 32 through the lubricating oil supply path 33. Because lubricating oil O is carried to the side of the swash plate on the flow of coolant gas, a sliding part is lubricated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor, and more particularly to a swash plate type compressor capable of stably lubricating a sliding portion.

[0002]

2. Description of the Related Art A swash plate type compressor includes a cylinder block,
A shell surrounding the outer periphery of the cylinder block, a rotating shaft rotatably supported by the cylinder block, a swash plate fixed to the rotating shaft, and a swash plate housing chamber formed in the cylinder block and housing the swash plate And The cylinder block is composed of a front cylinder block and a rear cylinder block that are connected to each other in the axial direction, and the shell is composed of a front shell and a rear shell that are connected to each other in the axial direction. .

FIG. 4 is a view showing the inside of a conventional swash plate type compressor.

A low-pressure space 130 communicating with the swash plate housing chamber is formed between the outer peripheral surface of the cylinder block 160 and the inner peripheral surface of the shell 161.

In the upper part of the low-pressure space 130, a low-pressure gas suction passage 132 for guiding the low-pressure gas (low-pressure refrigerant gas) sucked from the rear side of the cylinder block 160 to the swash plate housing chamber.
(A portion shown by a two-dot chain line in FIG. 4). The low-pressure gas contains lubricating oil O. Low-pressure gas enters the low-pressure space 130 from the outside, passes through the swash plate storage chamber,
It hits the outer peripheral surface of the cylinder block, the inner peripheral surface of the shell, and the swash plate before reaching each suction chamber (not shown) on the rear side,
The lubricating oil O is separated from the low-pressure gas, and the lubricating oil O accumulates in an oil sump chamber 134 formed below the low-pressure space 130.

In the conventional swash plate compressor, an oil pump (not shown) is used to supply the lubricating oil O in the oil reservoir chamber 134 to, for example, a sliding portion such as a bearing that supports the swash plate, thereby performing lubrication.

[0007]

However, when the compressor starts up, the refrigerant gas sometimes enters the oil pump, and when the refrigerant gas enters the oil pump, the oil pump slides on the lubricating oil O in the oil sump chamber 134. Supply to the department.

Further, the use of an oil pump for supplying the lubricating oil O has been a factor of increasing the number of parts of the compressor and increasing the cost.

The present invention has been made in view of such circumstances, and a problem thereof is that a swash plate type compression which can stably supply lubricating oil in an oil sump to a sliding portion without using an oil pump. Is to provide a machine.

[0010]

According to a first aspect of the present invention, there is provided a swash plate compressor comprising: a cylinder block; a shell surrounding an outer periphery of the cylinder block;
A rotating shaft rotatably supported by the cylinder block, a swash plate that rotates integrally with the rotating shaft, a swash plate housing chamber formed in the cylinder block for housing the swash plate, and an outer periphery of the cylinder block A low-pressure space formed between the surface and the inner peripheral surface of the shell and communicating with the swash plate housing chamber; and a low-pressure gas formed above the low-pressure space and sucked from one end of the cylinder block. In a swash plate type compressor including a low-pressure gas suction passage leading to a plate housing chamber and an oil reservoir formed at a lower portion of the low-pressure space and storing lubricating oil in the low-pressure gas, a low-pressure gas suction passage of the low-pressure gas suction passage is provided. A lubricating oil supply passage for supplying lubricating oil in the oil reservoir to the middle of the low-pressure gas suction passage by utilizing a pressure drop caused by a flow is provided.

The low-pressure gas in the low-pressure gas suction passage flows at a high flow rate to the swash plate storage chamber side, and the pressure in the low-pressure gas suction passage drops. It is supplied in the middle of the suction passage. Since the lubricating oil is carried to the swash plate side by the flow of the refrigerant gas, sliding parts such as the swash plate are lubricated.

A swash plate type compressor according to a second aspect of the present invention is the swash plate type compressor according to the first aspect of the invention, wherein the cylinder blocks are axially connected to each other in a front cylinder block portion and a rear cylinder block portion. Wherein the lubricating oil supply passage is a groove formed on at least one of the connecting surfaces of the front side cylinder block portion and the rear side cylinder block portion.

As described above, the lubricating oil supply passage is formed with a groove on one of the connecting surfaces of the front side cylinder block and the rear side cylinder block. It is.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing the inside of a swash plate type compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG. It is sectional drawing which follows.

The front cylinder block 1 and the rear cylinder block 2 are connected to each other in the axial direction.
One cylinder block 60 is configured. The valve plate 3 and the valve seat 2 are provided at one end of the cylinder block 60.
7 and the front head 4 via the stopper plate 29
The other end is provided with a valve plate 5 and a valve seat 28.
The rear head 6 is arranged via a stopper plate 30.

A discharge chamber 24 and a suction chamber 23 are formed in the front head 4 and the rear head 6, respectively. The rear head 6 is provided with a suction port (not shown) leading to an outlet of an evaporator (not shown).

The front shell 4 is attached to the front head 4.
The rear shell 6 is provided integrally with the rear head 6. The front side shell part 13 and the rear side shell part 14 are fitted to each other in the axial direction via the O-ring 38, and one shell 61 is configured.

Front head 4, cylinder block 60
The rear head 6 is connected in the axial direction with a through bolt 39.

A rotary shaft 7 is disposed at the center of the cylinder block 60, and a swash plate 8 is fixed to the rotary shaft 7.
The rotating shaft 7 is rotatably supported by a bearing 9,
The boss 8a of the swash plate 8 is rotatably supported by a bearing 10. The sliding surface 8b of the swash plate 8 is inclined with respect to a virtual plane perpendicular to the rotation axis 7. The swash plate 8 is housed in a swash plate housing chamber 31 (see FIG. 3) formed in the cylinder block portion 60. The cylinder block portions 1 and 2 are provided with through holes 40 and 41 penetrating in the axial direction, and the through holes 40 and 41 communicate with the swash plate housing chamber 31. Further, holes 3a, 5a, 2 facing the respective through holes 40, 41 in the axial direction.
7a, 28a, 29a, 30a are valve plates 3,
5. Valve seats 27, 28 and stopper plates 29, 3
0 is provided. Through hole 40 and holes 3a, 27a, 2
9a form a passage 50, the through-hole 41 and the hole 5a,
A passage 51 is formed by 28a and 30a.

The low-pressure space 30 is formed between the inner peripheral surface of the shell portion 61 and the outer peripheral surface of the cylinder block 60. The low-pressure space 30 communicates with the swash plate housing chamber 31. Low pressure space 30
An oil sump chamber 34 is formed at the bottom of the tank for storing lubricating oil O separated from low-pressure refrigerant gas. In the upper part (upper half) of the low-pressure space 30, a low-pressure gas suction passage 32 (shown by a two-dot chain line in FIG. 1) for guiding the low-pressure refrigerant gas sucked from the suction port of the rear head 6 to the swash plate housing chamber 31. Part) is formed.

The low-pressure refrigerant gas sucked from the suction port of the rear head 6 is supplied to the low-pressure gas suction passage 32 and the swash plate housing chamber 3.
1. Flow into the suction chamber 23 via the passages 50 and 51.

Front side shell portions 13 which are in surface contact with each other
Arc-shaped grooves 33a and 33b are formed on the connection surface 13a of the rear shell portion 14 and the connection surface 14a of the rear shell portion 14, respectively, and one lubricating oil supply passage 33 is formed by opposing the grooves 33a and 33b in the axial direction. Is done.

The cylinder block 60 is provided with a plurality of cylinder bores 11. The cylinder bores 11 are parallel to the rotation shaft 7 and are arranged at predetermined intervals in a circumferential direction around the rotation shaft 7. A piston 12 is slidably housed in each cylinder bore 11.

Compression chambers 21 and 22 are formed on both sides of the piston 12 in each cylinder bore 11. Piston 1
2 is connected to the swash plate 8 via substantially hemispherical shoes 19 and 20.

Next, the operation of the swash plate type compressor according to this embodiment will be described.

When the rotating shaft 7 rotates, the swash plate 8 also rotates integrally. The rotation of the swash plate 8 causes the piston 12 to reciprocate in the cylinder bore 11. When the swash plate 8 rotates by １ ／, when the piston 12 is located closest to the valve plate 3 (left side in FIG. 2) (when the piston 12 is located at the top dead center on the compression chamber 21 side), the piston 12 moves to the valve plate 5 side (the right side in FIG. 2), the suction stroke ends on the compression chamber 21 side, and the compression / discharge stroke ends on the compression chamber 22 side. When the swash plate 8 further rotates by か ら from this state, the suction stroke ends on the compression chamber 22 side.
The compression and discharge stroke ends on the side.

The low-pressure refrigerant gas flowing out of the outlet of the evaporator flows from the suction port of the rear head 6 to the low-pressure gas suction passage 3.
The swash plate 8 turns into the swash plate housing chamber 31 near the middle portion of the low-pressure gas suction passage 32, and heads toward the boss 8 a of the swash plate 8. Then, the air reaches the suction chamber 23 through the passages 50 and 51. In the suction stroke, the refrigerant gas in the suction chamber 23 is sucked into the compression chambers 21 and 22,
The refrigerant gas in the compression chambers 21 and 22 is compressed in the compression stroke, and the high-pressure refrigerant gas in the compression chambers 21 and 22 is compressed in the discharge stroke in the discharge chamber 2.
4 and is sent from the discharge chamber 24 to the inlet of a condenser (not shown) through a discharge port (not shown).

The lubricating oil O separated from the low-pressure refrigerant gas is stored in the oil sump chamber 34 of the low-pressure space 30. As described above, since the low-pressure refrigerant gas flows into the low-pressure gas suction passage 32 from the suction port of the rear head 6, the low-pressure gas suction passage 3
The flow rate of the gas in 2 is high, and this gas flows from the suction passage 32 to the front and rear suction chambers 23 via the swash plate housing chamber 31 and the passages 50 and 51. Therefore, the low pressure space 3
Since the pressure of the low-pressure gas suction passage 32 is lower than that of the other parts (for example, the oil sump chamber 34) (the pressure of the low-pressure gas suction passage 32 of the low-pressure space 30 is lower than that of the oil sump chamber 34), The lubricating oil O in the reservoir 34 is
And is supplied to the middle of the low-pressure gas suction passage 32. Since the lubricating oil O is carried to the boss 8a side of the swash plate 8 by the flow of the refrigerant gas, the sliding surface 8b of the swash plate 8 and the sliding portion such as the bearing 10 are lubricated.

According to this embodiment, since the oil pump is not used, the problem that the lubricating oil O is not supplied from the oil sump chamber 31 to the sliding portion due to the refrigerant gas entering the oil pump when the compressor is started is solved. As a result, the lubricating oil can be supplied stably, and the number of components of the compressor can be reduced, thereby reducing the cost.

In the embodiment described above, the lubricating oil supply passage 33 is connected to the connecting surfaces 2a, 2b of the two cylinder block portions 2, 3.
Although it is constituted by two grooves 33a and 33b formed in 3a, a groove may be formed only on one of the connection surfaces of the cylinder block portions 2 and 3 as another lubricating oil supply path.

Further, a lubricating oil supply passage may be provided on the inner peripheral surface of one or both of the shell portions 13 and 14.

[0033]

As described above, according to the swash plate type compressor of the first aspect of the present invention, since the oil pump is not used, the lubricant gas enters the oil pump when the compressor is started, so that the lubricating oil is stored in the oil reservoir. The problem that the oil is not supplied to the sliding portion from the motor can be solved, the lubricating oil can be supplied stably, the number of parts of the compressor can be reduced, and the cost can be reduced.

According to the swash plate compressor of the second aspect,
Since the groove is formed on the connection surface of at least one of the front cylinder block and the rear cylinder block as the lubricating oil supply path, the lubricating oil supply path can be easily processed.

[Brief description of the drawings]

FIG. 1 is a diagram showing the inside of a swash plate type compressor according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a view showing the inside of a conventional swash plate type compressor.

[Explanation of symbols]

 1, 2 Cylinder block part 4 Front head 6 Rear head 7 Rotary shaft 8 Swash plate 12 Piston 13, 14 Shell part 31 Swash plate accommodation space 32 Low-pressure gas suction passage 33 Lubricating oil supply passage 33a, 33b Groove 34 Oil reservoir 60 Cylinder block 61 Shell O Lubricating oil

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhiko Arai 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama

Claims (2)

[Claims] 1. A cylinder block, a shell surrounding the outer periphery of the cylinder block, a rotation shaft rotatably supported by the cylinder block, a swash plate that rotates integrally with the rotation shaft, and a cylinder block. A low-pressure space formed between the outer peripheral surface of the cylinder block and the inner peripheral surface of the shell and communicating with the swash plate storage chamber; A low-pressure gas suction passage formed at an upper portion of the cylinder block and guiding the low-pressure gas sucked from one end of the cylinder block to the swash plate housing chamber; and an oil formed at a lower portion of the low-pressure space and storing lubricating oil in the low-pressure gas. A swash plate type compressor having a sump chamber and supplying the lubricating oil of the oil sump chamber to the middle of the low pressure gas suction passage by utilizing a pressure drop caused by a flow of the low pressure gas in the low pressure gas suction passage. Swash plate type compressor, characterized in that it comprises a lubricating oil supply passage for. 2. The cylinder block includes a front cylinder block portion and a rear cylinder block portion connected to each other in an axial direction, and the lubricating oil supply passage includes the front cylinder block portion and the rear side. The swash plate type compressor according to claim 1, wherein the groove is a groove formed on at least one of the connection surfaces of the cylinder block portion.