JPH0552181A - Compressor - Google Patents

Abstract

PURPOSE:To stably hold air-tightness with an external part for a long period by surely performing anticorrosion in a connection end surface of housings, relating to a compressor. CONSTITUTION:In the case of a compressor whose housings 1, 3 formed divided from each other are fixedly connected through an O ring 2, a corrosion resistant plating layer 17 is formed in at least a connection part end surface, with which the O ring 2 is brought into contact, of the housings 1, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly to a compressor capable of maintaining a hermetically sealed portion for a long period of time.

[0002]

2. Description of the Related Art Generally, in a compressor for an automobile air conditioner, split housings are joined and fixed through a sealing member such as an O-ring or a gasket, but rust due to water or salt damage is generated on the joined end surface of the housing. However, the airtightness inside the housing may not be maintained. As a measure against this, after assembling the divided housings, a coating is formed on the surface of the housing by coating the joint portion in particular.

[0003]

However, the coating film only covers the periphery of the joint end surface of the housing, and does not cover the end surface of the housing with which the seal member abuts. Therefore, when the coating film is deteriorated due to heat or distortion and cracks or the like occur, moisture penetrates from that portion and the sealing surface of the housing is corroded. For this reason, there is a problem in that the airtightness of the sealing surface cannot be maintained.

In recent years, aluminum alloy housings have been used for weight reduction, but aluminum is susceptible to corrosion by chlorine ions. In the coastal area, the above problem becomes more remarkable because the water content in the atmosphere contains chloride ions. Further, in the method of forming a coating film by coating, there is a problem that coating is required after assembly when the compressor is disassembled for repair or the like.

Freon R12 and R22 are conventionally used as the refrigerant gas of the compressor. However, these Freons contain chlorine in the molecule, and when released into the atmosphere, they cause destruction of the ozone layer, so Freon R
12, R22 can no longer be used. Therefore, instead of Freon R21 and R22, Freon R134a containing no chlorine has been used as the refrigerant gas. Freon R134 as this new refrigerant gas
Since a easily absorbs water, the water easily enters the vicinity of the seal member arranged on the joint end surface of the housing.
Then, there is a problem that the vicinity of the seal member arranged on the joint end surface of the housing is easily corroded by this moisture.

The present invention has been made to solve the above problems, and an object thereof is to provide a compressor capable of reliably preventing corrosion of the joint end surface of the housing and stably maintaining airtightness with the outside for a long period of time. To do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a compressor in which housings formed separately from each other are joined and fixed via a seal member, and at least a joint portion of the housing where the seal member abuts. The gist is that a corrosion resistant coating is formed on the end faces.

[0008]

The function of the present invention is to prevent corrosion of the housing by the corrosion-resistant coating formed on the joint end surface even if water enters the vicinity of the seal portion that keeps the inside of the housing airtight. For this reason,
Adhesion between the seal member and the housing is secured, and the airtightness of the seal portion is stably maintained for a long period of time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a wobble type compressor will be described below with reference to FIGS.

As shown in FIG. 1, a recess 1 is formed on both end surfaces of a cylinder block 1 which constitutes a part of a compressor housing.
Each a is formed in an annular shape, and an O-ring 2 as a seal member is housed in each recess 1a. A front housing 3 having a crank chamber 3a is joined and fixed to the front portion of the cylinder block 1 through the O-ring 2. Further, a rear housing 4 in which a suction chamber 4a and a discharge chamber 4b are formed is joined and fixed to the rear portion of the cylinder block 1 via an O-ring 2 and a valve plate P.

That is, the O-ring 2 comes into contact with the end surfaces of the front housing 3 and the rear housing 4,
The end surfaces of the joints of the cylinder block 1, the front housing 3, and the rear housing 4 are sealed by the O-ring 2.

A rotary shaft 5 is rotatably supported between the cylinder block 1 and the front housing 3. In the front housing 3, the rotary support 6 is attached to the rotary shaft 5.
Is fixed, and a supporting arm 7 is provided on the rear surface side thereof so as to project. A long hole 7a is provided at the distal end of the support arm 7, and a pin 8 is slidably fitted in the long hole 7a. ing. A slider 10 is provided on the rotary shaft 5.
Is slidably inserted in the axial direction, and is pressed and biased toward the rotary support 6 by the pressing spring 11. The slider 1
The rotation driving plate 9 supports the pair of pins 10a (only one of which is shown) projecting from a symmetrical position of 0.
Is supported so as to be swingable in the direction of the rotary shaft 5. The swing swash plate 12 is attached to the support cylinder portion 9a of the rotary drive plate 9.
Are supported so that they can rotate relative to each other and can swing together.

The swing swash plate 12 is in a cylinder bore 13 penetrating the cylinder block 1 so as to connect the crank chamber 3a in the front housing 3 and the suction chamber 4a and the discharge chamber 4b in the rear housing 4 to each other. Is connected to the piston 14 via a piston rod 15.
Therefore, the rotary motion of the rotary shaft 5 is converted into the forward and backward reciprocating swing of the swing swash plate 12 via the rotary drive plate 9, and the piston 14 moves back and forth in the cylinder bore 13. As a result, the refrigerant gas sucked from the suction chamber 4a into the cylinder bore 13 is compressed and discharged into the discharge chamber 4b.

At the bottom of the cylinder block 1, a pressure release passage 2 is provided.
0 is provided so as to communicate with the crank chamber 3a and the suction chamber 4a, so that the pressure increase in the crank chamber 3a is suppressed. An electromagnetic control valve mechanism 16 is built in the rear end bulging portion of the rear housing 4. The electromagnetic control valve mechanism 16 is connected to the discharge chamber 4b via a passage 19 and the crank chamber 3a via a passage 18.
It is connected to the. An O-ring 16a is fitted in the outer peripheral groove of the tip of the electromagnetic control valve mechanism 16. When the electromagnetic control valve mechanism 16 operates, the crank chamber 3a and the discharge chamber 4b are in communication with each other via the passages 18 and 19. Then, the stroke of the piston 14 changes according to the pressure difference between the pressure in the crank chamber 3a and the suction pressure, and the tilt angle of the swing tilt plate 12 that affects the compression capacity changes.

A plating layer 17 (only the front housing 3 and the cylinder block 1 are shown in FIG. 2) is formed as a corrosion-resistant coating on the entire inner and outer peripheral surfaces of the cylinder block 1, the front housing 3 and the rear housing 4. .. In this embodiment, the plating layer 17 is formed by known chromate plating. FIG. 2 shows in detail the state in which the plating layer 17 formed on the end face of the joint between the front housing 3 and the cylinder block 1 is formed.

Therefore, in the wobble type compressor constructed as described above, even if moisture enters the end faces of the joint portions of the cylinder block 1, the front housing 3 and the rear housing 4, each cylinder block is treated by the plating layer 17. 1, the front housing 3 and the rear housing 4 are protected, and corrosion is reliably prevented. As a result, the airtightness of the seal portion can be reliably maintained, and the leakage of the refrigerant gas and the intrusion of moisture from the outside can be reliably prevented. Therefore, even if the refrigerant gas (Freon R134a) that easily absorbs water is used, the refrigerant gas flows through the external refrigerant gas circuit without containing water, and the external refrigerant gas circuit is adversely affected by the water contained in the refrigerant gas. This is prevented in advance.

In this embodiment, since the plating layer 17 is formed on the inner and outer peripheral surfaces of the cylinder block 1, the front housing 3 and the rear housing 4, the lip arranged between the rotary shaft 5 and the front housing 3 is formed. Corrosion of the vicinity of the seal 21 and the contact portion between the O-ring 16a arranged between the electromagnetic control valve mechanism 16 and the rear housing 4 is prevented at the same time, and the airtightness in the housing is maintained for a long time.

Further, when the plating layer 17 is partially formed, masking treatment or the like is required, but since the plating layer 17 is formed on the entire cylinder block 1, the front housing 3 and the rear housing 4, it is partially formed. On plating layer 1
7 can be performed more efficiently and with less effort than forming 7.

The present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the plating layers 17 are formed on the cylinder block 1, the front housing 3 and the rear housing 4, respectively. The plating layer 17 may be formed only on the rear housing 4 (only the front housing 3 is shown in FIG. 3). This is because the front housing 3 and the rear housing 4 are in contact with the O-ring 2 only at one place (the arrow A portion in FIG. 3), whereas the cylinder block 1
On the side, the O-ring 2 is in contact with the recess 1a at least at two locations (three locations in the present embodiment, B, C, D arrow portions in FIG. 3). Therefore, even if a part of the cylinder block 1 is corroded, the remaining surface and the O-ring 2 can maintain the airtightness of the seal portion, but in the front housing 3 and the rear housing 4, if the part A corrodes. This is because airtightness cannot be maintained by the O-ring 2.

Further, the recess 1a for accommodating the O-ring 2 is provided not on the cylinder block 1 side but on the front housing 3 and the rear housing 4 side, and the plating layer 17 is formed only on the cylinder block 1 side, or the cylinder block 1, The plating layer 17 may be formed only on the joint end surfaces of the front housing 3 and the rear housing 4.

Further, the plating layer 17 is not limited to chromate plating, and may be other plating such as nickel-phosphorus plating.
Further, although the embodiment is embodied as a wobble type compressor, it can be applied to other compressors such as a swash plate type compressor and a scroll type compressor.

[0022]

As described above in detail, according to the present invention, the joint end surface of the housing is reliably protected from corrosion, and the airtightness of the seal portion can be stably maintained for a long period of time. ..

[Brief description of drawings]

FIG. 1 is a sectional view of a wobble type compressor embodying the present invention.

FIG. 2 is a partially enlarged sectional view of a joint end surface of a front housing and a cylinder block.

FIG. 3 is a partially enlarged cross-sectional view showing another example in which the plating layer is formed only on the front housing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder block which comprises a housing, 2 ... O-ring as a sealing member, 3 ... Front housing, 4
... rear housing, 16a ... O-ring as seal member, 17 ... plated layer as corrosion resistant coating, 21 ... lip seal as seal member

Claims (1)

[Claims] 1. A compressor in which housings formed separately from each other are joined and fixed via a seal member, and a corrosion-resistant coating is formed on at least a joint end surface of the housing with which the seal member abuts. ..