JP3112529B2 - Rotary 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 rotary compressor used for a refrigerator, an air conditioner and the like, and more particularly to a rotary compressor having an improved structure of a vane slidingly contacting an eccentric roller.

[0002]

2. Description of the Related Art Generally, a compression block of a rotary compressor is provided with a cylinder block for partitioning a cylinder chamber. A main bearing and a sub-bearing for supporting the crankshaft are provided on both sides of the cylinder block. An eccentric roller is fitted into an eccentric portion formed in a part of the crankshaft, and a vane that partitions the cylinder chamber into a low pressure side and a high pressure side is brought into sliding contact with the eccentric roller. The vane is elastically supported by the cylinder block so as to be able to reciprocate along a vane groove that is opened facing the cylinder chamber.

[0003] In this type of rotary compressor, the atmosphere of the sliding portion such as pressure, temperature, and lubricating oil has become increasingly severe, for example, R-12 has been restricted as a refrigerant to be used due to recent chlorofluorocarbon gas regulations. In particular, studies are being made on alternative CFC gasification for refrigerators and in-vehicle air conditioners. But,
The lubrication performance of the refrigerant itself and the lubricating oil and the like suitable for the refrigerant
Since both are inferior to current refrigerants and lubricating oils, the wear resistance of the sliding member forming the sliding portion of the rotary compressor has been improved.

[0004] Above all, various materials such as alloys, composite materials and ceramics have been studied since the sliding part of the vane has a high temperature.

[0005]

By the way, in the conventional rotary compressor, as a material for forming the vane,
Ceramics are better in terms of wear resistance than alloys and composite materials. However, ceramics are difficult to process,
When a coating is applied thereto, the coating film is peeled off, and there is a problem that the compatibility with the eccentric roller is not good.

[0006] Therefore, it is necessary to further examine the material for forming the vane.

[0007] In view of the above problems, it is an object of the present invention to improve the conformability and wear resistance, to be able to be used under severe operating conditions under high temperature and high pressure, and to improve the reliability of products. To provide a rotary compressor.

[0008]

In order to achieve the above object, a compressor according to the present invention comprises an eccentric roller provided in a cylinder chamber defined by a cylinder block, and a sliding contact with the eccentric roller. A rotary compressor having a vane reciprocating along a vane groove formed in the cylinder block and partitioning the cylinder chamber into a low pressure side and a high pressure side, wherein a surface of the vane made of an iron-based material is A titanium nitride layer is formed by vapor deposition or chemical vapor deposition , and at least on a sliding contact portion of the titanium nitride layer with the eccentric roller , by physical vapor deposition or chemical vapor deposition.
This is achieved by forming a titanium oxide layer as a familiar layer .

[0009]

According to the above construction, the titanium nitride layer is formed on the surface of the vane, and the titanium oxide layer is formed thereon.

When the above-mentioned titanium nitride slides with a metal-based material, if the surface pressure is rapidly increased in the early stage of operation, the mating member is likely to be abraded. The property is deteriorated. The present invention has found that this familiar layer is formed of titanium oxide,
On this titanium nitride layer, a titanium oxide layer is formed in advance as a familiar layer.

As a result, it is possible to obtain a vane having good wear resistance and conformability.

Incidentally, a titanium oxide layer as a familiar layer is:
If the titanium nitride layer is formed at least on the sliding contact portion with the eccentric roller, the portion that is most likely to be abraded is protected, so that the minimum effect is exerted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a rotary compressor according to the present invention will be described below in detail with reference to the accompanying drawings.

A horizontal rotary compressor will be described first by way of example.

As shown in FIG. 3, a sealed case 12 is provided in the rotary compressor 11, and an electric element 14 provided at one end of a crankshaft 13 is accommodated in the sealed case 12. Also, a compression element 15 provided on the other end side of the crankshaft 13 is accommodated. A lubricating oil A is stored at the bottom of the closed case 12.

The compression element 15 has a cylinder block 1 defining a cylinder chamber 16 as shown in FIGS.
And a main bearing 1 which supports the crankshaft 13 with the cylinder block 17 interposed therebetween.
8. A sub bearing 19 is provided. Eccentric roller 22 is fitted so as to surround it in the eccentric portion 21 formed on the crank shaft 13, as shown in Figure 5, the low-pressure side and a high pressure side cylinder chamber 16 to the eccentric roller 22 And the vane 23 partitioning between them. The vane 23 is elastically supported by the cylinder block 17 so as to reciprocate along a vane groove 24 opened toward the cylinder chamber 16.

The rotary compressor of the first embodiment is
It is configured as shown in FIG. As shown, the sliding member 3 forming the sliding portion 30 of the rotary compressor
The vane 23 as 1 is formed of an iron- based material such as cast iron, and a titanium nitride layer 32 is formed on the surface thereof by physical vapor deposition or chemical vapor deposition. A titanium oxide layer 33 is formed on the titanium nitride layer 32 by physical vapor deposition or chemical vapor deposition. That is, the surface of the vane 23 formed of a ferrous materials, the coating layer 32, 33 of the two layers are formed.

Next, the operation of the above embodiment will be described.

[0019] As described above, by forming a titanium nitride layer 32 on the surface of the vane 23 formed of a ferrous materials, the wear resistance of the vane 23 is improved. In particular, titanium nitride adhesion to the abrasion resistance and iron-based materials of the base material due to its high hardness as compared with the silicon nitride or silicon carbide of silicon is good. However, the mating member (for example, the eccentric roller 22) that is in sliding contact with this is easily worn,
Particularly under high pressure, the familiarity at the beginning of operation is poor.

Therefore, by forming the titanium oxide layer 33 having good compatibility at the beginning of operation on the titanium nitride layer 32, the compatibility at the initial stage is improved.

When titanium nitride slides with a metal-based material, if the surface pressure is rapidly increased in the early stage of operation, the mating member is likely to be worn. Deteriorates. An analysis of this familiar layer shows that titanium oxide is formed there, which reduces the aggression on the mating member.

Therefore, according to the present invention, the titanium oxide layer 33 is formed on the titanium nitride layer 32 as a familiar layer.
Is formed in advance, and the vane 23 having good wear resistance and familiarity can be obtained.

As a result, it can be used under severe operating conditions under high temperature and high pressure, and as a result, the reliability of the product can be improved.

The rotary compressor of the second embodiment is
It is configured as shown in FIG. As shown, the second embodiment includes a vane 23 of the rotary compressor 11.
It was formed of a ferrous materials, on the surface thereof, thereby forming a titanium nitride layer 32 by physical vapor deposition or chemical vapor deposition,
The titanium oxide layer 33 is formed by physical vapor deposition or chemical vapor deposition on a portion 23a of the titanium nitride layer 32 which is in sliding contact with the eccentric roller 22.

The second embodiment has basically the same functions and effects as the first embodiment. In particular, in the second embodiment, a titanium oxide layer 33 is formed on a part of the titanium nitride layer 32. It is very economical to form.

The vane 23 of the rotary compressor 11
Although the present invention has been applied to the present invention, the present invention can be applied to other sliding contact portions. Further, although the present embodiment has been described with respect to the rotary compressor, the present invention is not limited to this, and can be applied to a sliding portion of a scroll compressor.

[0027]

As described above, the rotary compressor according to the present invention has good adaptability and abrasion resistance, and can be used under severe operating conditions under high temperature and high pressure. It has an excellent effect of improving the reliability of products.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a vane in a rotary compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a vane in a rotary compressor according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a rotary compressor according to the present invention.

FIG. 4 is a schematic longitudinal sectional view showing a compression element of the rotary compressor according to the present invention.

FIG. 5 is a schematic cross-sectional view showing a compression element of the rotary compressor according to the present invention.

[Explanation of symbols]

 Reference Signs List 16 Cylinder chamber 22 Eccentric roller 17 Cylinder block 17a Vane groove 23 Vane 32 Titanium nitride layer 33 Titanium oxide layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/356 F04C 18/344 F04C 29/00

Claims (1)

(57) [Claims] An eccentric roller provided in a cylinder chamber defined by a cylinder block, and slidingly contacts the eccentric roller to reciprocate along a vane groove formed in the cylinder block to move through the cylinder chamber. In a rotary compressor having a vane for partitioning into a low pressure side and a high pressure side , a physical pressure is applied to the surface of the vane made of an iron-based material.
While forming a titanium nitride layer by vapor deposition or chemical vapor deposition , at least on the sliding contact portion of the titanium nitride layer with the eccentric roller, with a familiar layer by physical vapor deposition or chemical vapor deposition
Rotary compressor is characterized in that the titanium oxide layer was.