JP3139643B2 - Swash plate compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional compressor is disclosed in
The one described in Japanese Patent Publication No. 380 is known. As shown in FIGS. 3 and 4, the compressor includes a cylinder block 51 having a plurality of bores 50 around a shaft hole. A front end of the cylinder block 51 has a crank chamber 52 formed therein. At the rear end, a rear housing 57 having a discharge chamber 55 defined on the inner peripheral side and a suction chamber 56 defined on the outer peripheral side by a peripheral wall 54 is joined via a valve plate 58. A drive shaft 60 is rotatably supported by the cylinder block 51 and the front housing 53 through the crank chamber 52. The drive shaft 60 is provided with a swinging swash plate 63 via a rotary support 61 and a sleeve 62. Are tiltably supported. Swing swash plate 63
The piston 65 disposed in each bore 50 of the cylinder block 51 is moored via a piston rod 66 so that the piston 65 reciprocates in the bore 50 according to the inclination angle of the swash plate 63. It is made movable.

In this compressor, when the swash plate 63 rotates together with the drive shaft 60, the piston 65 reciprocates in the bore 50, so that the suction chamber 56 passes through the suction port 67 of the valve plate 58 through the bore 50. The refrigerant gas drawn into the discharge chamber 5 is compressed through the discharge port 68 of the valve plate 58 while being compressed.
5 is discharged. Then, the stroke of the piston 65 fluctuates according to the pressure difference between the pressure in the crank chamber 52 and the suction pressure in the bore 50, and the displacement is controlled by changing the inclination angle of the swash plate 63.

[0004] In this compressor, a partition wall 70 is provided extending from a peripheral wall 54 separating the discharge chamber 55 and the suction chamber 56 to between discharge ports 68 opened into the discharge chamber 55.
It is designed to prevent direct mutual interference of discharged fluids.

[0005]

In the above compressor, when the refrigerant gas sucked into the bore 50 is compressed to a high pressure, the valve pressure rises from the cylinder block 51 by the gas pressure. In the direction to be deformed. For this reason, the high-pressure refrigerant gas in the bore 50 flows out to another adjacent bore 50 through a gap formed in the end face of the cylinder block 51 due to the deformation of the valve plate 58, and the compression efficiency is reduced. The high-pressure refrigerant gas that has flowed into the gap at the end face of the cylinder block 51
It may flow out into the crank chamber 52 through a gap between the crankshaft 52 and the drive shaft 60, which may hinder pressure control in the crank chamber 52.

Also, as in the above-described compressor, the suction chamber 56
Is formed in an annular shape on the outer peripheral side of the rear housing 57, and when the refrigerant introduction hole connecting the suction chamber 56 and the refrigeration circuit is provided through the outer peripheral side of the rear housing 57, each refrigerant port is connected to the refrigerant introduction hole. The suction path of the refrigerant gas reaching each bore 50 via 67 is imbalanced. For this reason, although the bore 50 near the coolant introduction hole preferably sucks and discharges the coolant, the bore 50 far from the coolant introduction hole sucks and compresses the insufficient refrigerant due to the pressure loss.
Cannot be utilized effectively, and sufficient performance cannot be exhibited, and vibration and abnormal noise are generated due to the imbalance of the compression reaction force of each bore 50. When the refrigerant gas introduced from the refrigerant introduction hole is sucked into the bore 50 far from the refrigerant introduction hole, the refrigerant gas comes into contact with the peripheral wall 54 separating the discharge chamber 55 and the suction chamber 56 for a long time, and the high-temperature discharge chamber It will be heated and expanded. When the refrigerant gas diluted by expansion is compressed, sufficient performance cannot be exhibited, for example, due to a difference in cooling capacity under the same compression work.

The present invention has been devised in view of the above problems, and prevents leakage of refrigerant gas from a bore through an end face of a cylinder block, and also prevents generation of vibration and abnormal noise due to imbalance in compression reaction force. And to exhibit sufficient performance.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a suction chamber is formed on an inner peripheral side and a discharge chamber is formed on an outer peripheral side by partitions in a housing. The suction chamber on the peripheral side is formed integrally with the partition wall so as to surround a suction port communicating with each bore, and is joined to the valve plate together with the partition wall.
Inlet passages that guide refrigerant gas to the inlets independently
A novel means is employed in which a holding rib is formed to form a path together with the partition .

In the present invention, it is preferable that the suction chamber has a radial passage on an outer wall of the housing and communicates with a coolant introduction hole penetrating coaxially with the drive shaft. be able to.

[0010]

In the compressor of the present invention, the deformation of the valve plate due to the high-pressure refrigerant gas in the bore is suppressed by the pressing rib joined to the portion of the valve plate corresponding to the suction chamber. This allows
The sealing performance at the end face of the cylinder block is improved, and leakage of the high-pressure refrigerant gas from the bore to another bore or the like can be prevented.

In the compressor according to the present invention, when the suction chamber has a radial passage communicating with a refrigerant introduction hole formed in the outer wall of the housing so as to be concentric with the drive shaft and communicate with the refrigerant, the refrigerant is introduced into the housing. The suction paths from the holes to the respective bores are independent, uniform and shortest, and all the bores suitably suck and compress the refrigerant. Therefore, the bores are effectively utilized to exhibit sufficient performance, and vibration and abnormal noise are not generated due to the balance of the compression reaction force of each bore. In addition, since the refrigerant introduced from the refrigerant introduction hole is sucked into all the bores at the shortest distance, the refrigerant only comes into contact with the partition wall that separates the suction chamber and the discharge chamber for a short time, and is affected by the heat of the high-temperature discharge chamber. Hard to receive.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a variable displacement swash plate type compressor will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view along the axial direction of the compressor according to the present embodiment, and FIG. 2 shows a side view of a cylinder block corresponding to a line II-II in FIG. In the figure, reference numeral 1 denotes a cylinder block which constitutes a part of an outer shell of a compressor. A front housing 2 is joined to a front end of the cylinder block 1, and a rear housing 3 is provided with a valve plate 4 at a rear end. Are joined through. A drive shaft 6 penetrates a crank chamber 5 formed by the cylinder block 1 and the front housing 2, and the drive shaft 6 is rotatably mounted on the cylinder block 1 and the front housing 2 via a bearing 7. It is supported. A plurality of bores 8 are bored in the cylinder block 1 around the axis and parallel to the axis, and a piston 9 is fitted into each bore 8.

In the crank chamber 5, a rotary support 10 is supported by the drive shaft 6 so as to be able to rotate synchronously with the drive shaft 6, and a spherical sleeve 11 is rotatably and slidably supported. The spherical sleeve 11 is urged rearward by a pressing spring 12 mounted on the outer periphery of the drive shaft 6. On the spherical sleeve 11, a spherical sleeve 11
A swash plate 14 formed in an annular shape so as to surround the swash plate is supported to be able to swing back and forth.

A hemispherical shoe 15 is engaged with both sides of the outer peripheral portion of the swash plate 14, and the outer surface of the shoe 15 is formed in a swash plate passage groove 9a formed in the neck portion of the piston 9 so as to face each other. Engaged with the support surface. Thus,
A plurality of pistons 9 moored to the swash plate 14 via shoes 15 are accommodated in each bore 8 so as to be able to reciprocate. A pair of arms 17 project from the upper rear surface of the swash plate 14 at symmetrical positions with respect to the drive shaft 6. on the other hand,
A pair of support arms 18 projecting rearward are provided on the upper portion of the rotary support 10 so as to face the pair of arm portions 17. A guide pin 21 whose lower end is slidably fitted to each arm portion 17 is mounted.

In the rear housing 3, a suction chamber 23 is formed on the inner peripheral side and a discharge chamber 24 is formed on the outer peripheral side by a partition wall 25. The suction chamber 23 communicates through a radial passage 23 a with a refrigerant introduction hole 26 provided in the rear end wall of the rear housing 3 so as to be concentric with the drive shaft 6, and is formed in the valve plate 4. The bore 8 communicates with the bore 8 via the suction port 27 and the suction valve 28. In the suction chamber 23, a pressing rib 30 is formed integrally with the partition 25 so as to surround the suction port 27 of each bore 8 and the suction valve 28 on the inner peripheral side of the partition 25. Is partition wall 2
5 together with the valve plate 4. This allows each bore
The suction port 27 and the suction valve 28 of FIG.
And the suction formed independently by the partition 25
Refrigerant introduction hole 26 through the chamber 23 and the radial passage 23a.
Is in communication with On the other hand, the discharge chamber 24 communicates with the bore 8 via a discharge port 31 and a discharge valve 32 formed in the valve plate 4, and also communicates with a refrigerant discharge hole (not shown). The rear housing 3 is provided with a pressure control valve (not shown) for adjusting the pressure in the crank chamber 5.

In the compressor configured as described above,
When the swash plate 14 rotates as the drive shaft 6 rotates,
The swash plate 14 moored with each piston 9 is a spherical sleeve 11
The piston 9 reciprocates in the bore 8 by sliding in the circumferential direction and swinging. Thus, the refrigerant gas returned to the suction chamber 23 through the refrigerant introduction hole 26 is sucked into the bore 8 whose volume is being expanded through the suction port 27 and the suction valve 28, and the refrigerant gas is compressed. The liquid is discharged to the discharge chamber 29 via the discharge port 31 and the discharge valve 32. At this time, the discharge capacity of the refrigerant gas discharged to the discharge chamber 29 depends on the pressure in the crank chamber 5 by the pressure control valve.
It is controlled by adjusting the internal pressure. Then, the refrigerant gas in the discharge chamber 29 is sent out to the refrigeration circuit through the refrigerant discharge holes.

As described above, when the refrigerant gas sucked into the bore 8 is compressed to a high pressure by the forward movement of the piston 9, the center of the valve plate 4, that is, the suction chamber 23 having a lower pressure than the discharge chamber 24, The corresponding portion is forced to deform in the direction in which it floats from the cylinder block 1 by the gas pressure. However, on the inner peripheral side of the partition 25 of the rear housing 3, the holding rib 3 joined to the valve plate 4 together with the partition 25 is provided.
0, the deformation of the valve plate 4 is suppressed, the sealing performance at the end face of the cylinder block 1 is improved, and leakage of the high-pressure refrigerant gas from the bore 8 to another bore 8 or the crank chamber 5 is almost certain. Is prevented.

Further, in this compressor, the suction paths from the refrigerant introduction holes 26 to the respective bores 8 through the passages 23a, the suction chambers 23 and the suction ports 27 are independent, uniform and shortest. Thus, with each bore 8 is preferably exhibit sufficient performance by intake, compression of refrigerant gas, the compression reaction force of each bore 8 A
It does not occur the vibration and noise from unbalanced. Also,
Since the refrigerant gas introduced from the refrigerant introduction hole 26 is sucked into all the bores 8 at a short distance, the refrigerant gas only comes into contact with the partition wall 25 for partitioning the suction chamber 23 and the discharge chamber 24 for a short time. It is hardly heated by the discharge chamber 24 and hardly expands.

Therefore, according to the compressor of this embodiment,
It is possible to prevent leakage of the refrigerant gas from the bore 8 by improving the sealing performance at the end face of the cylinder block 1, prevent vibration and abnormal noise due to unbalance of the compression reaction force, and exhibit sufficient performance. The swash plate type compressor of the above embodiment is of a variable displacement type. The swash plate 14 is fixed to the drive shaft 6 at a predetermined inclination angle, and the stroke of the piston 9 is adjusted by changing the pressure in the crank chamber 5. The present invention can also be applied to a fixed displacement swash plate type compressor configured to operate at a predetermined discharge displacement in such a manner as not to operate.

[0020]

According to the compressor of the present invention, in the housing, the suction chamber is formed on the inner peripheral side and the discharge chamber is formed on the outer peripheral side by the partition wall, and the inner side of the partition wall is formed. The suction chamber is formed integrally with the partition so as to surround a suction port communicating with each bore, and is joined to the valve plate together with the partition, and is independent from the refrigerant introduction hole for each of the suction ports.
To form a suction passage for guiding refrigerant gas
Since the holding rib is formed, it is possible to prevent the refrigerant gas from leaking from the bore through the end surface of the cylinder block.

In the case where the suction chamber has a radial passage communicating with the refrigerant introduction hole formed through the outer wall of the housing concentrically with the drive shaft, the compression reaction force is unbalanced. Generation of vibration and abnormal noise can be prevented, and sufficient performance can be exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view along an axial direction of a compressor according to an embodiment.

FIG. 2 is a side view of the rear housing according to the embodiment.

FIG. 3 is a cross-sectional view along the axial direction of a conventional compressor.

FIG. 4 is a side view of a conventional rear housing.

[Explanation of symbols]

1. Cylinder block 3. Rear housing 5.
Crank chamber 6 Drive shaft 8 Bore 9 Piston 14 Swash plate 23 Suction chamber 23 a Passage 24 Discharge chamber 25 Partition wall 26
... Refrigerant introduction hole 30 ... Holding rib

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Takeshi 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (56) References Jikai Sho 62-148786 (JP, U) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) F04B 27/08

Claims (2)

(57) [Claims] 1. A cylinder block having a plurality of bores formed around an axis parallel to the axis, a drive shaft fitted and supported in an axis hole of the cylinder block, and A housing having a piston linked to a cooperating swash plate and reciprocating in the bore, and a suction chamber and a discharge chamber selectively connected to the bore joined to an outer end of the cylinder block via a valve plate. In a swash plate type compressor comprising:
In the housing, a suction chamber is formed on the inner peripheral side and a discharge chamber is formed on the outer peripheral side by partition walls, and a suction port communicating with each of the bores is formed in the suction chamber on the inner peripheral side of the partition walls. Is formed integrally with the partition so as to be joined to the valve plate together with the partition, and each of the
Inlet that guides refrigerant gas independently to the inlet
A swash plate type compressor having a holding rib forming a passage together with the partition . 2. The suction chamber according to claim 1, wherein the suction chamber has a radial passage formed in the outer wall of the housing and communicating with a coolant introduction hole which is provided coaxially with the drive shaft. Swash plate compressor.