JP2568714Y2 - Piston type compressor - Google Patents

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 having a suction chamber and a discharge chamber, in which refrigerant gas sucked into a cylinder bore from the suction chamber is compressed by a piston and discharged to a discharge chamber.

[0002]

2. Description of the Related Art In general, a piston compressor accommodates a piston in a cylinder bore, rotates the swash plate accommodated in a swash plate chamber provided in a front housing by a rotation shaft, and reciprocates the piston. The refrigerant gas is drawn into the cylinder bore from the suction chamber in the rear housing, which is joined and fixed to the end surface of the cylinder block via the valve plate, through the suction hole provided in the valve plate, and the compressed refrigerant gas is formed on the valve plate. The discharge holes are discharged into the discharge chamber.

[0003]

In this piston type compressor, from the mounting portion of the external refrigerant suction pipe connected to the outer periphery of the rear housing to each of the cylinder bores formed in an annular shape around the center axis of the rotating shaft. Because the distance of
The amount of gas sucked into each cylinder bore is different, resulting in variations in compression load and variations in lubrication due to variations in the amount of mist-like lubricating oil contained in the suction gas, resulting in increased noise or torque fluctuations in the rotating shaft. In particular, there has been a problem that reliability at high-speed rotation is reduced.

[0004] As a conventional piston type compressor, a compressor having a partition plate having a passage for reducing discharge pulsation in a discharge chamber has been proposed. The partition plate has a structure in which a fitting groove is provided in the discharge chamber of the rear housing, and a cylindrical rib formed on the outer periphery of the partition plate is press-fitted therein. For this reason, there is a problem that the cost cannot be reduced unless the shape of the fitting groove of the discharge chamber is cylindrical, and that it takes time and effort for processing and assembly.

A method has also been proposed in which the partition plate is screwed to a step provided in the discharge chamber. However, in this case, assembly and the number of parts are increased, and cost cannot be reduced.

An object of the present invention is to solve the above-mentioned problems in the prior art, to make it possible to easily manufacture the partition plate by press molding, to reduce the number of parts, to easily assemble, and to reduce the cost of the product. An object of the present invention is to provide a piston type compressor that can be downed.

[0007]

The present invention achieves the above object by providing a plurality of pistons each accommodating a plurality of pistons.
For the end face of the cylinder block with the cylinder bore,
Intake via a valve plate with suction and discharge holes
Join the housings that define the entrance and discharge chambers,
The rotation of the rotation shaft causes each of the pistons to
Reciprocate in the cylinder bore and move each cylinder bore from the suction chamber.
(A) Compresses gas sucked into the compression chamber and discharges it to the discharge chamber
In the piston type compressor as described above, at least
The suction chamber is divided into a plurality of chambers, and the plurality of cylinder
A partition plate having a plurality of suction passages corresponding to
The housing for partitioning the suction chamber with respect to the partition plate of
Sandwiched between the end face of the partition wall of the ring and the valve plate.
And the plurality of suction passages are integrally formed.
The housing to connect the suction chamber with an external area.
The farther from the suction port formed in the
It was made to be relatively large .

[0008]

[Action] This invention is therefore to form the clamping portion to be clamped between at least the partition wall end face of the valve plate and the housings against partition plate for partitioning <br/> the suction chamber into a plurality chambers, compartments Assembling the plate to the compressor is a housing for the cylinder block
It is easily done at the same time as the installation of the ring . Further, the clamped portion of the partition plate can be easily processed by press molding, the number of parts does not increase, and no special processing of the housing is required, so that the cost can be reduced. In addition, a partition plate is provided corresponding to multiple cylinder bores.
The multiple suction passages connect the suction chamber to an external area.
The farther from the suction port of the housing,
Because the product is relatively large, the distance from the inlet
Gas is equally distributed in each cylinder bore, regardless of the distance
Go around. As a result, the compression and
The power required for suction is equalized, and the torque fluctuation of the rotating shaft is reduced.
Is suppressed.

[0009]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 2, in this swinging swash plate type variable displacement compressor, a front housing 2 is joined to a front end face of a cylinder block 1 having a plurality of cylinder bores 1a (in this embodiment, six locations as shown in FIG. 3). It is fixed. A crankcase 3 is formed in the front housing 2. A rear housing 4 having a suction port 4a connected to an external refrigerant suction pipe and a discharge port 4b connected to an external refrigerant discharge pipe is fixedly connected to the rear end face of the cylinder block 1.
A valve plate 5 and a suction valve plate 6 and a discharge valve plate 7 located before and after the valve plate 5 are interposed between the cylinder block 1 and the rear housing 4. Each of the valve plates 5
Are formed with a suction hole 5a and a discharge hole 6b, respectively. A suction chamber 8 formed on the outer peripheral side by a partition wall 4c in the rear housing 4 is communicated with the cylinder bore 1a by a suction hole 5a. A discharge chamber 9 formed inside the rear housing 4 is communicated with the cylinder bore 1a by the discharge hole 5b. The suction valve plate 6 is formed with a suction valve 6a corresponding to the suction hole 5a, and the discharge valve plate 7 is similarly formed with a discharge valve 7a corresponding to the discharge hole 5b. Further, a retainer 10 for regulating an opening position of the discharge valve 7a is fastened and fixed to a central portion of the discharge valve plate 7 by a bolt 11.

A rotary shaft 12 is supported at the center of the cylinder block 1 and the front housing 2. A lug plate 13 is fitted and fixed to the rotating shaft 12. The lug plate 13 has an arm portion 13a formed therein. A rotating swash plate 14 is formed in a slot 13b formed in the arm portion 13a so as to be swingable in the front-rear direction by a connecting pin 15 and can be rotated synchronously with the rotation of the rotating shaft 12. It is supported by. Further, a swinging swash plate 16 is mounted on the rotating swash plate 14 so as to be able to swing only in the front-rear direction. The swash plate 16 and the piston 17 housed in the cylinder bore 1a are connected by a piston rod 18.

Accordingly, when the rotary shaft 12 is rotated, the swinging swash plate 16 is reciprocated in the front-rear direction, whereby the piston 17 is reciprocated at a predetermined stroke via the rod 18, and is moved from the suction chamber 8. After the refrigerant gas sucked through the suction hole 5a is compressed in the compression chamber R in the cylinder bore 1a, the refrigerant gas is discharged from the discharge hole 5b to the discharge chamber 9.

The suction pressure and the crank chamber pressure in the crank chamber 3 act on the front and rear surfaces of each piston 17 respectively, and the bending swash plate 16 acting on each piston 17 causes the swash plate 16 to bend. Reference numeral 16 changes the inclination angle of the connection pin 15 around the center. For this reason, the stroke of the piston 17 is changed, and the discharge capacity is changed.

An adjusting valve for adjusting the pressure in the crank chamber 3 is provided in the cylinder block 1 or the rear housing 4 (not shown). Next, a description will be given of an assembling structure of the partition plate 21, which is a main part of the present invention.

In this embodiment, as shown in FIG. 1, an integral partitioning plate 21 for partitioning the suction chamber 8 and the discharge chamber 9 into two front and rear chambers is interposed between the discharge valve plate 7 and the rear housing 4. ing. On the outer peripheral edge of the partition plate 21, a first clamped portion 21a clamped between the front end surface 4d of the outer peripheral side wall of the rear housing 4 and the discharge valve plate 7 is formed. The partition plate 21 has a front end surface 4e of the partition wall 4c provided on the rear housing 4 and the discharge valve plate 7.
The second clamped portion 21b to be clamped is formed by drawing by pressing. Furthermore, the partition plate 21 partitions the suction chamber 8 into a first suction chamber 8A and a second suction chamber 8B.
The first partition part 21c has a suction passage 21d corresponding to each suction hole 5a formed in the valve plate 5. As shown in FIG. 3, the diameter of each of the suction passages 21d is larger in the passage corresponding to the cylinder bore 1a farther from the suction port 4a.

The partition plate 21 is a second partition 21e for partitioning the discharge chamber 9 into a first discharge chamber 9A and a second discharge chamber 9B.
The partition 21e has a plurality of discharge passages 21f corresponding to the respective discharge holes 5b formed in the valve plate 5.
Are formed.

Next, the operation of the variable displacement piston type compressor constructed as described above will be described. Now, in FIG. 2, when the rotating shaft 12 is rotated to rotate the rotating swash plate 14 via the lug plate 13 and the connecting pin 15, the swinging swash plate 16 is swung in the front-rear direction, and the piston 18 is moved through the rod 18. 17 is reciprocated back and forth in the cylinder bore 1a. For this reason, the refrigerant gas sucked into the compression chamber R in the cylinder bore 1a from the first suction chamber 8A, the suction passage 21d, and the second suction chamber 8B through the suction hole 5a is compressed by the piston 17 and is discharged from the discharge hole 5b through the first hole. It is discharged to the discharge chamber 9A.
Thereafter, the liquid is guided to the second discharge chamber 9B through the discharge passage 21f and is pressure-fed to an external discharge pipe.

The refrigerant gas sucked into the first suction chamber 8A is sucked into the second suction chamber 8B through each suction passage 21d formed in the first partition 21c of the partition plate 21. As shown in FIG. 3, the diameter of each of the suction passages 21d is larger as the diameter corresponding to the cylinder bore 1a far from the suction port 4a.
The refrigerant gas is almost uniformly sucked from the suction chamber 8A into the second suction chamber 8B, and the refrigerant gas is evenly sucked into the space corresponding to each cylinder bore 1a. For this reason, it is possible to eliminate the excess and deficiency of the refrigerant gas sucked into each cylinder bore 1a, to equalize the power required for compression and suction by each piston 17, to equalize the rotational torque of the rotary shaft 12, and to reduce noise. Generation can be suppressed.

The above-mentioned suction refrigerant gas is temporarily stored in the first suction chamber 8.
A, after being drawn into A, a suction passage 21d provided in the partition plate 21
Is moved to the second suction chamber 8B, the muffler effect is generated, and the pulsation of the suction of the gas can be suppressed, and the noise can be suppressed from this point as well.

Further, the first discharge chamber 9 is disposed inside the cylinder bore 1a.
The gas discharged to A is discharged from the discharge passage 21f to the second discharge chamber 9B. In this process, the second partition 21
Since discharge pulsation is suppressed by the muffler effect of e, noise is reduced.

In this embodiment, since the first and second clamped portions 21a and 21b sandwiched between the valve plate 5 and the rear housing 4 are formed on the partition plate 21, the partition plate 21 is compressed. It can be easily assembled in the aircraft.
In addition, the processing of the partition plate 21 can be performed simultaneously by press molding, and there is no need to perform a special process for attaching the partition plate 21 to the rear housing 4. Therefore, manufacturing can be facilitated and cost can be reduced. It becomes possible.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, a gasket 25 is interposed between the first and second clamped portions 21a and 21b of the partition plate 21 and the rear housing. Therefore, the sealing performance between the first suction chamber 8A and the second discharge chamber 9B can be improved, and the sealing performance between the first suction chamber 8A and the outside can be improved.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, a discharge cylinder 21g is formed for a partition 21e that partitions the discharge chambers 9A and 9B of the partition plate 21, and the partition 4e of the rear housing 4 is formed.
A throttle hole 26 that connects the second discharge chamber 9B and the first suction chamber 8A is formed below c. Therefore, the first discharge chamber 9A
The refrigerant gas discharged into the second discharge chamber 9B through the discharge cylinder portion 21g collides with the inner wall surface of the rear housing 4, where the mist-like lubricating oil O contained in the gas is removed from the bottom of the second discharge chamber 9B. Is stored in Since this oil is supplied to the first suction chamber 8A through the throttle hole 26, lubricating oil can be supplied into the suction refrigerant gas without installing an oil separator separately.

The present invention is not limited to the above-described embodiment. For example, a sealing material such as rubber (not shown) may be used for the first and second clamped portions 21a and 21b of the partition plate 21.
The function of a gasket can be imparted by coating. In this case, the number of parts can be further reduced.

Further, one of the first partition 21c and the second partition 21e formed on the partition plate 21 is omitted.

[0025]

As described in detail above, the present invention makes it possible to easily assemble the partition plate to the compressor, and also to easily process the partition plate by press molding. And the manufacturing cost can be reduced.
Also, the cross-sectional area of the suction passage provided in the partition plate is determined by the suction of the housing.
By making it different according to the distance from the inlet, each cylinder
Distribute the gas evenly in the bore, and in each piston
To equalize the power required for compression and suction
Fluctuation can be suppressed. As a result, noise reduction
And the reliability at the time of high-speed rotation can be improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a main part of a piston type compressor embodying the present invention.

FIG. 2 is a longitudinal sectional view showing the entire piston type compressor embodying the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partial sectional view showing another embodiment of the present invention.

FIG. 5 is a partial sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 cylinder block, 1a cylinder bore, 4 rear housing, 4a suction port, 4b discharge port, 4c partition, 4d, 4e end face, 5 valve plate, 5a suction hole, 5b discharge hole, 8 suction chamber, 8A first suction chamber,
8B second suction chamber, 9 discharge chamber, 9A first discharge chamber, 9
B 2nd discharge chamber, 21 partition board, 21a, 21b 1st, 2nd clamping part, 21c, 21e 1st, 2nd partition part, 21d suction passage, 21f discharge passage.

Continued on the front page (72) Inventor Hisakazu Kobayashi 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (56) References JP-A-4-276192 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of pistons each accommodating a plurality of pistons.
To the end face of a cylinder block with a cylinder bore
And, the suction hole and through the valve plate formed with discharge hole joining a housing defining a suction chamber and a discharge chamber, each of said piston therewith corresponding to the rotation of the rotary shaft
In a piston type compressor which reciprocates in a cylinder bore and compresses gas sucked from a suction chamber into each of the cylinder bore compression chambers and discharges the gas to a discharge chamber, at least a plurality of the suction chambers are provided. Room and
A partition plate having a plurality of suction passages corresponding to the number of cylinder bores is provided, and the suction chamber is partitioned with respect to the partition plate.
And the end surface of the partition wall of the housing, integrally formed to be clamping portion being clamped between said valve plate, further wherein
A plurality of suction passages for connecting the suction chamber to an external area;
The farther from the inlet formed in the housing, the more
A piston-type compressor in which the cross-sectional area of the passage is relatively large .