KR960010172B1 - Swash plate type compressor - Google Patents

Abstract

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Description

Swash plate compressor

The present invention relates to an improvement of a suitable swash plate compressor provided for vehicle air conditioning.

As a conventional swash plate type | mold compressor, the thing of Unexamined-Japanese-Patent No. 54-55711 is known. In this swash plate type compressor, a pair of cylinder blocks face each other to form a swash plate chamber in communication with the suction port of the return refrigerant, and each cylinder block is connected to the front and rear housings through the valve plate. It is closed. Each housing is formed with a suction chamber and a discharge chamber, and the discharge chamber communicates with the discharge port for discharging the discharge refrigerant. The drive shaft is supported by the shaft hole of each cylinder block, and the swash plate attached to this drive shaft is accommodated so that rotation is possible in the swash plate chamber. In addition, each cylinder block is formed with a plurality of front and rear pairs of bores arranged in parallel around the drive shaft, and two bore pistons moored through a shoe on a swash plate are fitted to each bore. On the inner circumferential side of each cylinder block, a plurality of suction passages are formed for sending refrigerant in the swash plate chamber to the suction chamber of each housing. On the outer circumferential side of each cylinder block, the discharge chamber of the front housing and the discharge chamber of the rear housing are provided. One discharge passage communicating with is formed.

In the swash plate type compressor, a ring-shaped lip seal is provided coaxially with the drive shaft in the suction chamber, and the lead portion of the drive shaft is hermetically sealed by the lip seal to prevent the refrigerant from being removed from the suction chamber.

In this swash plate type compressor, the return refrigerant is introduced into the swash plate chamber from the refrigerating circuit via the suction port, and the return refrigerant in the swash plate chamber is guided to the suction chambers before and after through the suction passage. Thus, since the piston moves each bore directly through the swash plate by the rotation of the drive shaft, the return refrigerant in each suction chamber is sucked into each bore on the enlarged volume. Thereafter, the compressed refrigerant is discharged into the discharge chambers before and after the respective bores in the volume reduction diagram. The compressed refrigerant in the discharge chamber is discharged to the refrigerating circuit through the discharge passage and circulated to the refrigerating circuit again.

By the way, in the said general swash plate type compressor, as mentioned above, a ring-shaped lip seal is provided in the suction chamber, and the lead seal of the drive shaft is hermetically sealed by the lip seal, and the escape of the refrigerant in the suction chamber is prevented. However, since the lip seal rubs against the leading portion of the drive shaft as the drive shaft rotates, if the service life becomes longer, the axial sealability of the lip seal is reduced, resulting in a decrease in the reliability of the lip seal.

In the general swash plate type compressor, since the suction passage is fixedly formed at a position biased with respect to the suction chamber, the uniformity of the refrigerant concentration in the intake chamber is not necessarily sufficient.

This invention makes it the subject to solve the problem that the reliability of the storage device which encapsulates the extension part of a drive shaft can be improved, and the uniformity of the refrigerant concentration of a suction chamber can be apply | coated.

(Means to solve the task)

In order to solve the above-mentioned problems, the swash plate type compressor of the present invention includes a main hole drilled along an axis of a drive shaft for rotating a swash plate, and an introduction hole and a discharge hole respectively opening in the swash plate chamber and the suction chamber along the main hole. New means for forming a series of suction passages are employed.

The shaft device is installed in the suction chamber, and hermetically seals the lead portion of the drive shaft. As the sealing device, a lip seal made of rubber can be employed.

It is preferable that the swash plate is provided with a guide means for guiding the refrigerant in the introduction hole by the rotation thereof.

1 is a longitudinal cross-sectional view of a swash plate compressor of Example 1. FIG.

2 is a sectional view taken along the line A-A of FIG. 1 according to the swash plate compressor of the first embodiment.

3 is a cross-sectional side view of a swash plate boss according to another embodiment of the swash plate type compressor.

4 is a cross-sectional side view of the boss portion of the swash plate according to the swash plate compressor of another embodiment.

* Explanation of symbols for main parts of the drawings

1,2: cylinder block 1a, 2a: bore

3: suction port 4: swash chamber

5,6: valve plate 7,8: housing

11,12 discharge chamber 18 drive shaft

19: Lip seal 23: Commercial

25: piston 34: discharge passage

36: main hole 37: lead hole

38: introduction hole 40: suction passage

In the swash plate type compressor of the present invention, when the drive shaft rotates and the swash plate rotates, the piston reciprocates in the bore, and the suction stroke by volume expansion of the bore and the compression stroke by volume measurement of the bore are alternately performed. Here, in the suction stroke, the return refrigerant in the swash plate chamber is introduced into the main hole of the drive shaft from the introduction hole constituting the suction passage, passes through the main hole, and is led out of the suction hole to the suction chamber. The refrigerant reaching the suction chamber is sucked into the bore. Thus, in the compression stroke of the piston, the refrigerant in the bore is compressed and discharged out of the air through the discharge chamber.

By the way, when the refrigerant passing through the main hole is led out from the lead-out hole to the suction chamber, the opening of the lead-out hole also rotates in accordance with the rotation of the drive shaft. do. Therefore, the refrigerant | coolant containing mist-type lubricating oil makes it easy to contact the storage device provided in the suction chamber uniformly. In addition, the concentration distribution of the refrigerant becomes uniform in the suction chamber.

In addition, when the guide means is provided in the swash plate, the return refrigerant in the swash plate chamber is effectively guided to the introduction hole by the rotation of the swash plate.

Next, the embodiment which actualized this invention is described, referring drawings.

Example 1

In the swash plate type compressor, as shown in FIG. 1, a pair of cylinder blocks 1 and 2 are provided to face each other and form a swash plate chamber 4 in communication with the suction port 3 of the return refrigerant. . Each cylinder block 1, 2 is closed at both ends by the front housing 7 and the rear housing 8 via valve plates 5, 6, respectively. In the front housing 7 and the rear housing 8, suction chambers 9 and 10 are formed inside the diameter, and ring-shaped discharge chambers 11 and 12 are formed outside the diameter. As shown in FIG. 1, the discharge chambers 11 and 12 communicate with the discharge passage 34 and the discharge port 35 for discharging the discharge refrigerant to the outside.

The drive shaft 18 is rotatably supported by the central shaft holes 1f and 2f of the cylinder blocks 1 and 2 via the radial bearings 14 and 15 between the cylinder blocks 1 and 2. The drive shaft 18 penetrates the through hole 5c of the valve plate 5 on the front side, and the directing portion 18a of the drive shaft 18 stops at the insertion hole 7c of the front housing 7. And through the center hole of the ring body 20 held via the ring seal 16a. Between the extending | stretching part 18a of the drive shaft 18, and the ring body 20, it is hermetically sealed by the ring-shaped lip seal 19 made of the rubber | gum of a ring-shape device.

The drive shaft 18 is equipped with a swash plate 23 that can rotate in the swash plate chamber 4, and the swash plate 23 is supported by the cylinder blocks 1 and 2 via the thrust bearings 21 and 22. . The swash plate 23 is formed of a boss portion 23a and a plate portion 23b. In addition, each cylinder block 1, 2 is provided with a plurality of front and rear pairs of bores 1a, 2a provided in parallel around the drive shaft 18, and each bore 1a, 2a is formed on the swash plate 23. The double headed piston 25 moored via the pair of shoes 24 is fitted to be able to move linearly.

In addition, each of the valve plates 5 and 6 is provided with suction ports 5a and 6a communicating with the suction chambers 9 and 10 via the suction valves 26 and 27 between the bores 1a and 1a. At the same time, the discharge ports 5b and 6b communicate with the discharge chambers 11 and 12 via the discharge valves 30 and 31 which limit the opening degree to the retainers 28 and 29 between the respective bores 1a and 2a. ) Is formed. Moreover, the through hole 6c which communicates with the suction chamber 10 of the rear side is formed in the valve plate 6 of the rear side. Therefore, on the outer circumferential side of each cylinder block 1, 2, a plurality of bolt holes 32 are formed containing the communication bolt 33.

As the most characteristic configuration of the swash plate type compressor, a main hole 36 having an opening 36a is formed in the driving shaft 18 along the shaft center thereof, and the suction chamber 9 of the driving shaft 18 is formed. In the area facing the hole, the lead-out hole 37 opening in the suction chamber 9 is drilled in an appropriate number in the radial direction, and extends in the radial direction thereof to the boss portion 23a of the swash plate 23. Two introduction holes 38 communicating with the main hole 36 are drilled through a predetermined distance. Here, a series of suction passages 40 are formed by the main hole 36, the introduction hole 38, and the discharge hole 37.

In the swash plate type compressor, when the drive shaft 18 rotates and the swash plate 23 rotates, the piston 25 reciprocates in the bores 1a and 2a, so that the suction stroke and volume of the bore 1a and 2a are enlarged. The compression stroke by volume reduction of (1a, 2a) is performed in turn. Here, at the time of suction, the return refrigerant returned from the refrigeration circuit to the swash plate chamber 4 via the suction port 3 is introduced into the main hole 36 of the drive shaft 18 through the introduction hole 38, and the main hole 36 On the front side, it is led to the suction chamber 9 from the lead-out hole 37 at the front side, and is led to the suction chamber 10 at the opening 36a of the main hole 36 at the rear side. Thus, the refrigerant in each suction chamber 9, 10 is sucked into each bore 1a, 2a in the enlarged volume via the suction ports 5a, 6a of the valve plates 5, 6, respectively. Then, the compressed refrigerant is discharged to the front and rear discharge chambers 11 and 12 via the discharge ports 5b and 6b of the respective valve plates 5 and 6 in the respective bores 1a and 2a on the volume reduction diagram. Thus, the compressed refrigerant is guided into the discharge passage 34 and discharged from the discharge port 35 to the external refrigeration circuit, so that the refrigerant circulates in the refrigeration circuit.

By the way, in this swash plate type compressor, when the coolant is led out from the discharge hole 37 of the drive shaft 18 to the suction chamber 9 on the front side, the opening of the discharge hole 37 is also changed in accordance with the rotation of the drive shaft 18. Rotate Therefore, the coolant drawn out from the lead-out hole 37 scatters uniformly in the circumferential direction of the drive shaft 18 in the suction chamber 9. Therefore, the low temperature return refrigerant easily contacts the lip seal 19 provided in the suction chamber 9 evenly. Therefore, it is advantageous to prevent cooling spots in the circumferential direction of the ring-shaped lip seal 19, and the reliability of the lip seal 19 can be maintained for a long time. In addition, since the refrigerant contains mist-shaped oil, the mist-shaped oil easily comes into contact with the entire circumferential direction of the lip seal 19, and is advantageous for maintaining the lubricity of the lip seal 19, and the lip seal 19 The reliability of can be further improved. In addition, in the swash plate type compressor, as shown in FIG. 1, the lead-out hole 37 is provided near the lip seal 19 and is opened toward the lip seal 19 so that the lead-out hole 37 is drawn out. One refrigerant is easy to contact the lip seal 19 and is advantageous for cooling lubrication of the lip seal 19.

Moreover, in this swash plate type compressor, the drive shaft 18 is provided in the substantially center area | region of the suction chamber 9, As mentioned above, since the opening of the extraction hole 37 which leads | induces a refrigerant | coolant rotates, the suction of a front side is carried out. The uniformity of the concentration distribution of the coolant in the circumferential direction of the seal 9 improves. Therefore, it is possible to improve the equal suction property of sucking the refrigerant evenly into each of the plurality of bores 1a, thereby increasing the volumetric efficiency of the compressor.

By the way, since the high temperature compressed refrigerant pressurized by the piston 25 passes through the discharge passage 34, the cylinder blocks 1, 2 are heated. In the swash plate type compressor, since the suction passage 40 is formed using the main hole 36 drilled in the drive shaft 18, the suction passage 40 is spaced apart from the discharge passage 34 in comparison with the conventional swash plate type compressor. Are arranged. Therefore, the refrigerant in the suction passage 40 returned from the refrigeration circuit is less likely to be affected by the heat of the discharge passage 34, which is advantageous for maintaining the low temperature of the feedback refrigerant. It is made to flow in, and it is advantageous for the improvement of a cooling capability.

In addition, in this swash plate type compressor, since the solid drive shaft is conventionally used as the suction passage 40, the suction passage does not need to be formed separately, and the outer diameter can be reduced in size and weight.

(Other embodiment)

Further, in the swash plate type compressor of the first embodiment, only the introduction hole 38 is formed by drilling radially with respect to the boss portion 23a of the swash plate 23, but the swash plate type compressor of the present invention is limited thereto. It doesn't happen.

For example, as shown in FIG. 3, the introduction holes 38c and 38d are displaced to the boss portion 23a by displacing forward of the boss portion 23a of the swash plate 23 in the rotational direction (arrow in the figure). It can also be drilled out.

In addition, as shown in FIG. 4, as the guide means, a guide cutout portion 38e, which is opened in the rotational direction (arrow in the figure) in front of the introduction hole 38, may be formed in the boss portion 23a. have.

As the guide means, the boss portion 23a may be provided with a guide portion having a guide surface which is opened on the outer circumferential side of the introduction hole 38 in the rotational direction (arrow in the figure).

In each of these embodiments, the refrigerant in the swash plate chamber 4 is guided to the introduction hole 38 most suitably through the guide means by the rotation of the swash plate 23.

According to the swash plate compressor of the present invention, since the refrigerant containing the lubricant is led out of the lead-out hole through the main hole of the drive shaft, the refrigerant containing the lubricant is led out uniformly over the entire peripheral area of the drive shaft in the suction chamber. In addition, since the opening of the lead-out hole also rotates with the rotation of the drive shaft, the refrigerant is more evenly scattered over the entire peripheral area of the drive shaft. Therefore, the refrigerant easily contacts the storage device provided in the suction chamber more uniformly, which is advantageous for cooling and lubrication of the storage device.

Therefore, according to the swash plate type compressor of the present invention, the reliability of the shaft device can be improved, and the cooling capacity can be maintained most suitably for a long time.

Moreover, in this swash plate type | mold compressor, since a solid drive shaft is used as a suction path conventionally, the outer diameter with respect to the share can be made small and light weight.

When the guide means is provided in the swash plate again, the refrigerant in the swash plate chamber is effectively guided to the introduction hole by the rotation of the swash plate.

Claims (2)

The cylinder blocks 1 and 2 having the swash plate chamber 4 and the plurality of doors 1a and 2a communicating with the suction port 3 are closed, and both ends of the cylinder blocks 1 and 2 are closed and each bore ( Front and rear housings 7 and 8 having discharge chambers 11 and 12 communicating in the inner diameter of the suction chambers 9 and 10 communicating with each of the bores 1a and 2a on the outside of the diameter. The drive shaft 18 rotatably supported by the cylinder block, the shaft rod device 19 installed in the suction chambers 9 and 10 and supporting the directing portion 18a of the drive shaft 18, and the drive shaft 18. A swash plate 23 mounted and rotatably housed in the swash plate chamber 4, and a piston which is moored to the swash plate 23 via the shoe 24 and slidably inserted into the respective bores 1a and 2a ( 25), the return refrigerant in the swash plate chamber 4 is sucked into the respective bores 1a and 2a via the suction chambers 9 and 10, and compressed refrigerant is discharged from the respective bores 1a and 2a. In swash plate compressors that discharge to (11,12) In addition, a series of holes are formed by a main hole 36 which is drilled along the axis of the drive shaft 18 and an introduction hole 28 and a discharge hole 37 which are respectively opened in the swash plate chamber and the suction chamber according to the main hole 36. A swash plate compressor, characterized in that a suction passage (40) is formed. The swash plate type compressor according to claim 1, characterized in that the swash plate (23) is provided with guide means (38e) for storing the refrigerant in the introduction hole (38).