JPH0688582A - Rotary compressor - Google Patents

Abstract

PURPOSE:To secure a rotary compressor provided with a vane excellent in reliability, and besides, improving the extent of wear resistance in a vane by way of covering the surface of a nitriding layer formed in the vane with ceramics. CONSTITUTION:Nitriding is applied to a base body 7 of a vane 14 subjected to hardening and tempering, and further a ceramic coating is applied on top of it, whereby a second nitriding layer 9 is formed in an inner part of the base body 7 and a first nitriding layer 8 on the top, respectively, and likewise a ceramic coating layer 15 is formed on the base body 7. This ceramic coating layer 15 is Hv>=1800 in hardness, very hard as compared with the first nitriding layer 8, and wear resistance is also by far excellent in comparison. Since the ceramic coating layer 15 is installed in a tip 14a of the vane 14 like this, the tip part is very hard so that wear is hard to occur even in severe lubricating conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a rotary compressor having improved vane wear resistance.

[0002]

2. Description of the Related Art Rotary compressors having vanes are widely used as compressors for compressing refrigerants such as refrigerators and coolers.

An example of a conventional rotary compressor will be described below with reference to the drawings. FIG. 6 shows Japanese Patent Application Laid-Open No. 60-22879.
FIG. 7 is a cross-sectional view of a conventional rotary compressor shown in Japanese Patent Publication No. 4 and FIG. 7 is a perspective view of a vane of the conventional rotary compressor. In FIG. 6, 1 is a closed container, 2 is an electric motor part, and 3 is a compressor part. 4 is a vane, 5 is a roller, and 6 is a cylinder, which together constitute the compressor unit 3. The operation of the rotary compressor configured as described above will be described.

When the compressor section 3 is driven by the electric motor section 2, the roller 5 rotates eccentrically along the inner wall of the cylinder 6, and the vane 4 in contact with the outer peripheral surface of the roller 5 turns the compression chamber into a high pressure chamber. Partition into a low pressure chamber and perform compression.

By the way, the tip 4a of the vane 4 has a roller 5
Since it is in contact with the outer peripheral surface, the most rigorous lubrication condition is set and metal contact easily occurs. Therefore, the vanes of the rotary compressor are required to have high wear resistance.

Therefore, in the conventional rotary compressor, quenching
A vane was used in which the material subjected to the tempering treatment was subjected to a nitriding treatment to improve the wear resistance.

FIG. 8 shows a conventional nitriding vane 4.
FIG. In FIG. 8, the first nitriding layer 8 is formed on the surface layer portion of the base material 7 by nitriding the vane 4.
The second nitriding layer 9 is generated. The first nitriding layer 8 has a thickness of about several μm, and the base materials Fe and C are used.
It is a compound layer containing Fe-Cr-N as a main component, in which N is highly densely reacted with r, and has a hardness of Hv ≧ 1200 and is excellent in wear resistance. The second nitriding layer 9 is formed to have a depth of 10 to 60 μm, the reaction of N is developed using Cr of the base material 7 as a base material, and the third nitriding layer 9 has the same composition as the first nitriding layer 8.
The compound 10 is dispersed in a mesh shape, and N is incorporated in the Fe crystal lattice.

[0008]

However, since the load on the rotary compressor is increasing with the recent increase in size of refrigerators, the vane wear resistance cannot be said to be perfect in the above-mentioned conventional configuration. However, there is a drawback that the wear of the tip of the vane increases during a long time operation and the compression performance deteriorates.

In view of the above problems, the present invention provides a rotary compressor having highly reliable vanes, which are further improved in wear resistance by subjecting vanes to nitriding treatment and ceramic coating. is there.

[0010]

In order to solve the above problems, in the rotary compressor of the present invention, a hermetically sealed container is provided with a motor section and a compressor section having a vane, and the vane is subjected to a nitriding treatment. It has a layer, and the surface of the nitriding layer is covered with a ceramic. The nitriding layer of the vane used in the rotary compressor of the present invention may be one in which the surface layer is removed by nitriding the vane.

[0011]

In the rotary compressor according to the present invention, the vanes are subjected to the nitriding treatment, and the nitriding layer is further overlaid with the ceramic coating, so that the vane wear resistance is further excellent.
High durability and reliability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotary compressor according to the present invention will be described below with reference to FIGS.

1 to 4, reference numeral 1 is a closed container, 2
Is an electric motor unit, and 13 is a compressor unit. The rotary compressor according to the present embodiment has a motor unit 2 inside a closed container 1 as in the prior art.
And the compressor section 13 is hermetically arranged.

The compressor section 13 is composed of a vane 14, a roller 5 and a cylinder 6.

The essential point of this embodiment is that the vane 14 is nitrided, and the tip 1 of the vane 14 is further processed.
4a is where it is covered by ceramics.

That is, in FIG. 3, 14a is a vane 1.
4 is a tip portion, 7 is a base material of the vane 14, 8 is a first nitriding layer formed in the vane 14 by nitriding treatment, and 9 is a base material 7 and a first nitriding layer of the vane 14 which are also nitriding treatment. 8 is a second nitriding layer formed during 8 1
Reference numeral 5 denotes a ceramic coating layer, which is formed on the outermost side of the vane 14.

That is, as shown in FIG. 3, the vane of this embodiment has the base material 7 of the vane 14 which has been quenched and tempered,
By performing a nitriding treatment and further applying a ceramic coating on the nitriding treatment, a second nitriding treatment layer 9 is formed inside the base material 7, and a first nitriding treatment layer 8 is formed on the second nitriding treatment layer 9. A ceramic coating layer 15 is formed on the surface. The first nitriding layer 8 is formed of the base materials Fe and C as described in the description of the prior art.
It is a compound layer containing Fe-Cr-N as a main component, in which N was highly densely reacted with r, and the hardness was Hv ≧ 1200. The second nitriding layer 9 formed by the above nitriding treatment is formed to a depth of 10 to 60 μm, the reaction of N develops with Cr of the base material 7 as a base material, and the same component as the first nitriding layer 8 is formed. Is a structure in which the compound 10 is scattered in a mesh shape, and N is embedded in the Fe crystal lattice.

The hardness of the ceramic coating layer 15 is Hv ≧ 1.
800, which is much harder than the first nitriding layer 8,
It has even better wear resistance.

The operation of the rotary compressor configured as described above will be described below. When the compressor unit 13 is driven by the electric motor unit 2, the roller 5 rotates eccentrically along the inner wall of the cylinder 6, and the vane 14 freely slides in the groove provided in the cylinder 6. Tip 14 of vane 14
a contacts the outer peripheral surface of the roller 5 and partitions the compression chamber of the cylinder 6 into a high pressure chamber and a low pressure chamber. At this time, the tip end portion 14a of the vane 14 and the outer peripheral surface of the roller 5 are under the most severe lubrication conditions, and metal contact is likely to occur. Vane 1 adopted in this embodiment
Since No. 4 is nitrided and the ceramic coating layer 15 is provided on the tip portion 14a, the tip portion is extremely hard and is less likely to wear even under severe lubrication conditions. Next, a typical example of the ceramic coating applied to the vane will be described. FIG. 5 shows the principle of a surface modification method by physical vapor deposition called ion plating, which is one method of ceramic coating.

In FIG. 5, reference numeral 20 denotes a vacuum container, the inside of which is 2 × 10 ^-5 Torr by a vacuum pump.
It is kept in vacuum. The base material 22 connected to the negative electrode 21 and the metal 25 such as titanium-nitride (Ti-N) arranged close to the filament 24 connected to the positive electrode 23 in the vacuum container 20 are It is arranged.

In the ion plating method, the apparatus shown in FIG. 5 is energized and heated, electrons are made to collide with the evaporated film forming atoms and reaction atoms, and a part of the atoms is repelled, The atom is positively (+) ionized. In the figure, 26 is a positive ionized evaporated metal. Then, the base material is negatively (-) charged, and the potential difference is used to cause atoms ionized with high energy to collide with the base material to deposit and form a film.

In the present embodiment, a vane that has been subjected to a nitriding treatment in advance is used as the base material, and the ceramic coating layer 15 is formed only on the tip of the vane.

As described above, the hardness of the ceramic coating layer 15 formed by this method is Hv ≧ 1800, which is very hard and the wear resistance is further excellent.

As described above, in this embodiment, the ceramic coating layer is provided only on the tip portion 14a of the vane 14. This is because it takes a long time to form the coating layer on the entire surface of the base material, that is, the vane 14. This is because it is necessary and not practical, and in order to solve this, the entire surface of the vane is subjected to nitriding treatment.
4a, etc.) is coated with ceramic.

However, the present invention is not limited to the configuration in which the ceramic coating layer is provided only on the tip of the vane as in the embodiment, and a configuration in which the ceramic coating layer is provided on the entire surface of the vane can be adopted. .

Further, in the above embodiments, the ceramic coating layer is directly provided on the surface of the first nitriding layer 8 formed by the nitriding treatment. However, for example, the surface of the first nitriding layer 8 formed by the nitriding treatment is provided. If there is minute unevenness in the surface, or if the first nitriding layer 8 is unstable and there is concern about the adhesion of the ceramic coating layer, the first nitriding treatment generated by the nitriding treatment as shown in FIG. The layer 8 is removed by a grindstone or the like to expose the second nitriding layer 9 generated by the nitriding treatment,
A configuration in which a ceramic coating layer is formed on the surface of the second nitriding layer 9 is also effective.

[0027]

As described above, according to the present invention, the vane is subjected to the nitriding treatment, and the first nitriding treatment layer or the second nitriding treatment layer is coated with the ceramic, so that the vane can withstand a severe lubrication condition. Since the vane has excellent wear resistance, the rotary compressor of the present invention does not increase wear even when operated for a long time, and has an effect of preventing deterioration of compression performance.

[Brief description of drawings]

FIG. 1 is a side sectional view of a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a vane used in the rotary compressor of the present invention.

FIG. 3 is a sectional structure diagram of the vane of FIG.

FIG. 4 is a sectional structural view of a vane according to a modified embodiment of the present invention.

FIG. 5 is a diagram showing the principle of the ceramic coating adopted in the present invention.

FIG. 6 is a side sectional view of a conventional rotary compressor.

FIG. 7 is a perspective view of a vane of a conventional rotary compressor.

FIG. 8 is a sectional structure diagram of a conventional vane.

[Explanation of symbols]

 1 Airtight container 2 Electric motor part 3 Compressor part 8 First nitriding layer 9 Second nitriding layer 14 Vanes 15 Ceramic coating layer

Claims (2)

[Claims] 1. A hermetically-sealed container is provided with a compressor section having an electric motor section and a vane, the vane having a nitriding layer,
A rotary compressor in which the surface of the nitriding layer is covered with ceramic. 2. The rotary compressor according to claim 1, wherein the nitriding layer of the vane is formed by nitriding the vane to remove the surface layer.