JP3635802B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor used mainly for commercial and household refrigeration and air conditioning.
[0002]
[Prior art]
There are various types of electric compressors for refrigerating and air-conditioning, such as reciprocating compressors and rotary compressors, all of which have been used in the field of refrigerating and air-conditioning for home and business use. Currently, it is growing by taking advantage of its features in terms of cost and performance. Above all, scroll compressors have been put into practical use by taking advantage of their high efficiency, low noise, and low vibration.
[0003]
As is well known, a scroll compression mechanism used in a scroll compressor is formed by meshing a fixed scroll having blades with a spiral curve and a turning scroll to form several compression chambers between the two. Each of the compression chambers is moved by the orbiting scroll to move from the outer peripheral side that sucks the refrigerant through the suction port to the inner periphery that leads to the discharge port, the volume is reduced, the refrigerant is compressed, and the compressed refrigerant is discharged. Discharge from the outlet.
[0004]
For the compression of the refrigerant, the orbiting scroll is supported by an Oldham ring so as to make a revolving motion without rotating, and the Oldham ring is supported by a fixing member so as to be movable for the support.
[0005]
Thus, the Oldham ring slides between both the fixed member and the orbiting scroll. In many cases, the orbiting scroll and the fixed scroll, the fixed member, and the Oldham ring are all formed of a ferrous material.
[0006]
On the other hand, specific chlorofluorocarbon R12 and designated chlorofluorocarbon R22 are used as the refrigerant. Specified chlorofluorocarbons are chemically stable, flammable and non-toxic compared to previous refrigerants such as sulfur disulfide and methyl chloride, and are widely used as ideal refrigerants and have been used for many years.
[0007]
Recently, however, it has been confirmed that specific chlorofluorocarbons contain chlorine atoms in the molecule, which causes destruction of the ozone layer, and alternative chlorofluorocarbons are being developed and specified.
[0008]
As an alternative refrigerant having high practicality, a refrigerant such as HFC (Hydro Fluoro Carbon) that does not contain chlorine is cited. “Hydraulic and pneumatic technology '94 .6” (published by Nippon Kogyo Publishing).
[0009]
[Problems to be solved by the invention]
However, when an alternative refrigerant is used, since the alternative refrigerant does not contain chlorine, the lubricity like the conventional specific chlorofluorocarbon cannot be expected. For this reason, the sliding condition becomes severe, and in the conventional support structure using the Oldham ring of the orbiting scroll, the sliding part is easily worn and the life of the support structure part is reduced. This is because the Oldham ring of the support structure part and the sliding part of both the orbiting scroll and the fixed member are likely to be in a boundary lubrication state where a part of the oil film is cut off because lubricity by an alternative refrigerant cannot be expected. This is thought to be caused by the fact that both parts are in the boundary lubrication state and the adhesion is caused by the fact that both of them are made of a ferrous material.
[0010]
Such a decrease in the life of the support structure is particularly a problem in the case of a maintenance-free and long-life operation like a hermetic compressor, because the life of the support structure immediately becomes the life of the entire compressor. Yes, it is not practical.
[0011]
The present invention has as its main object to solve the above-mentioned problems, and it is a main object to provide a scroll compressor that does not have a problem of a decrease in life due to the support and subsequent portion of the orbiting scroll even when an alternative refrigerant that does not contain chlorine is used. To do.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention performs a surface modification treatment after processing the Oldham ring in order to prevent adhesion of the Oldham ring due to poor lubrication of both the orbiting scroll and the fixed member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention of claim 1 uses a mixed refrigerant in which at least one or two or more of a fluorocarbon hydrogen refrigerant group is mixed as a refrigerant, and an electric motor and a swivel driven by the electric motor inside the sealed container In the scroll compressor provided with a scroll compression mechanism for compressing the refrigerant between the scroll and the fixed scroll, the Oldham ring that supports the orbiting scroll so that the orbiting scroll rotates without rotating with respect to the fixed scroll. Is formed of a different material from both the fixed member and the orbiting scroll so as to be movable for the support, and when the scroll compression mechanism is activated by the activation of the electric motor, the refrigerant is sucked and compressed. Repeat the refrigeration cycle. The refrigerant is a mixed refrigerant obtained by mixing at least one kind or two or more kinds of refrigerants in the fluorocarbon hydrogen refrigerant group, does not contain chlorine, and does not destroy the environment. Since the refrigerant does not contain chlorine, lubricity cannot be expected, and even if boundary lubrication occurs in the sliding part between the Oldham ring and both the orbiting scroll and the fixed member, both the Oldham ring and the orbiting scroll and the fixed member Since different materials are in sliding contact with each other, it is possible to avoid sticking in the boundary lubricated state, and the life of the support structure using the Oldham ring of the orbiting scroll is improved, and it does not contain chlorine. Even if an alternative refrigerant is used, there will be no problem of a decrease in life due to the support structure.
[0014]
Since the Oldham ring is made of different materials for the fixed member and the orbiting scroll and the wear resistance is improved in order to improve the wear resistance, the steam treatment layer 23 is an oxide film. The hardness increases, and it is difficult to adhere to the surface of the counterpart iron, increasing the wear resistance.
[0015]
In the invention of claim 2, since the surface after processing is subjected to steam treatment and further subjected to gas soft nitriding treatment, the steam treatment layer 23 is sealed, and the nitridation treatment layer 24 has higher wear resistance. A different material surface is formed, and it becomes difficult to adhere to the counterpart material. In order to achieve the operation of the invention of claim 1, the invention of any one of claims 1 and 2 clearly defines the modification process of the Oldham ring Therefore, there is an advantage that it is convenient when the Oldham ring is made of the same material as the orbiting scroll and the fixing member, and can be dealt with even by using an existing component.
[0016]
In the inventions of claims 1 and 2, the fixing member of each invention is sintered iron, and the orbiting scroll is aluminum.
[0017]
【Example】
Hereinafter, some embodiments of the present invention will be described with reference to FIGS.
[0018]
(Example 1)
1 to 2 show a first embodiment of the present invention. This embodiment is a case of a horizontally installed scroll compressor for refrigeration and air conditioning, and FIG. 1 shows the entire configuration.
[0019]
As a main configuration, a refrigerant mixture in which at least one or two or more of a fluorocarbon hydrogen refrigerant group is mixed as a refrigerant is used. An electric motor 2 is driven inside the hermetic container 1 by the electric motor 2. An Oldham ring 6 is provided between the orbiting scroll 3 and the fixed scroll 4, which is provided with a compression mechanism 5 for compressing the refrigerant, and supports the orbiting scroll 3 so that the orbiting scroll 3 does not rotate with respect to the fixed scroll 4. The Oldham ring 6 is formed of a different material from both the fixing member 7 which supports the Oldham ring 6 so as to be movable for the support and the orbiting scroll 3.
[0020]
Since the present embodiment is of a horizontally installed type, the compression mechanism 5 is on the right side in the sealed container 1, and the electric motor 2 that drives the compression mechanism 5 is on the left side in the sealed container 1. An oil reservoir 8 for oil 8a as a lubricant and an oil guide 9 for sending the oil 8a in the oil reservoir 8 to the lubrication target portion through the support structure portion 10 are provided.
[0021]
The compression mechanism 5 is configured by engaging the right fixed scroll 4 and the left orbiting scroll 3 in the same manner as in the prior art, and the orbiting scroll 3 faces the electric motor 2 and is driven to rotate through the Oldham ring 6. By this orbiting drive, the compression chambers 11 formed between both the orbiting and fixed scrolls 3 and 4 are reduced in volume while being moved from the outer peripheral side leading to the suction port 12 to the inner peripheral side leading to the discharge port 13. To compress. The refrigerant is sucked from the suction pipe 14 extending outside the sealed container 1 to the suction port 12. The compressed refrigerant is discharged into the sealed container 1 from the discharge port 13, supplied to a refrigeration cycle (not shown) for air conditioning from a discharge pipe 15 extending outside the sealed container 1, and then circulated back to the suction pipe 14 to circulate the refrigeration cycle. Execute.
[0022]
The fixed member 7 forms a bearing block fixed in the hermetic container 1 so as to hold the orbiting scroll 3 in a meshed state with the fixed scroll 4. The orbiting scroll 3 is integrated with the rotor 2 a of the electric motor 2. The crankshaft 16 that is fixed to and drives this is held by the fixing member 7. There is a stator 2b around the rotor 2a to constitute the electric motor 2.
[0023]
As shown in FIG. 2, the Oldham ring 6 has projections 17 at two locations on the diameter line on the surface facing the orbiting scroll 3, and projections 18 at two locations on the diameter line on the surface facing the fixing member 7. Provided so that both arrays are oriented at right angles to each other.
[0024]
The projections 17 of the Oldham ring 6 are fitted to the radial grooves 19 provided at two places on the diameter line of the orbiting scroll 3 and supported so that the projections 17 can move in the direction in which they are arranged. The Oldham ring 6 is supported so that it can move in the direction in which the protrusions 18 are arranged by fitting with the radial grooves 20 at two places on the diameter line. As a result, the orbiting scroll 3 is supported so as to be capable of orbiting without rotating. Further, the orbiting scroll 3 is fitted to a slider 21 which is held so that the projecting shaft 3a at the eccentric position can slide on the main shaft 16a of the crankshaft 16 in the radial direction. Accordingly, when the crankshaft 16 rotates, the orbiting scroll 3 is driven to rotate without rotating through the slider 21 and the Oldham ring 6.
[0025]
The arrangement of each member and means, and the specific configuration such as support, drive, fluid guide structure for sucking and compressing and discharging are configured in a range that satisfies the requirement of claim 1 of the present invention. Of course, it may be.
[0026]
The refrigerant used in the refrigeration cycle is a mixed refrigerant in which at least one or two or more of a fluorocarbon hydrogen refrigerant group is mixed, and does not contain chlorine and does not destroy the environment. However, the refrigerant discharged into the hermetic container 1 can reach the details of the sliding parts of each machine, but since it does not contain chlorine, lubricity cannot be expected. The Oldham ring 6, the orbiting scroll 3, and the fixing member 7 are not expected. Environmental lubrication may occur in the sliding part between the two.
[0027]
However, since both the Oldham ring 6 and the orbiting scroll 3 and the fixed member 7 are made of different materials, the different materials come into sliding contact with each other. The life of the support structure 22 using the Oldham ring 6 of the orbiting scroll 3 is improved, and even if an alternative refrigerant not containing chlorine is used, there is no problem of a decrease in life due to the support structure 22.
[0028]
In this embodiment, since the Oldham ring 6 and both the orbiting scroll 3 and the fixing member 7 are made of different materials, the steam-treated layer 23 obtained by subjecting the surface of the Oldham ring 6 to post-processing steam treatment as shown in FIG. The material is different on the surface.
[0029]
Therefore, the Oldham ring 6 can be easily dealt with by surface modification, so that the Oldham ring 6 is made of a material similar to the orbiting scroll 3 and the fixing member 7, or the orbiting scroll 3 and the fixing member 7 are different from each other. It is convenient when used as a material, and has the advantage of being able to cope with the use of ready-made parts.
[0030]
In the present embodiment, the Oldham ring 6 is made of an iron-based sintered material, the orbiting scroll 3 is made of an aluminum-based metal, and the fixing member 7 is an iron-based metal.
[0031]
The steam treatment of the Oldham ring 6 may be performed with steam having a temperature of 500 ° C to 600 ° C. The treatment time is suitably 1 hour to 100 hours. The steam-treated layer 23 thus formed has an oxide film, has improved hardness, and sufficiently prevented the mechanical sliding portion between the orbiting scroll 3 and the fixed member 7 from adhering due to poor lubrication. .
[0032]
(Example 2)
FIG. 4 shows a second embodiment of the present invention. In the scroll compressor having the same structure as that of the first embodiment, as shown in the figure, the surface of the Oldham ring 6 is processed and processed on the steam treatment layer in the same manner as in the first embodiment. Further, nitriding treatment such as gas nitriding is performed to form a nitriding treatment layer 24.
[0033]
As a result, the steam treatment layer 23 made of a different material with respect to the orbiting scroll and the fixing member is sealed in the Oldham ring 6 and the nitriding treatment layer 24 forms a different material surface with higher wear resistance. Further, the life can be extended. Further, when the Oldham ring 6 is made of a porous material, in particular, a sintered material such as an iron-based metal, it can be easily manufactured by forming a mold, and since the sealing treatment is performed, the durability due to the porousness is ensured. We can make up for weakness in terms of surface.
[0034]
For example, the nitriding treatment may be performed by heating at a temperature of 500 ° C. to 600 ° C. for 1 hour to 100 hours in an ammonia gas atmosphere. The hardness of the nitriding layer 24 increases as the processing temperature increases. Therefore, the hardness can be adjusted by setting the processing temperature. In addition to the above, various known nitriding processes can be applied.
[0035]
【The invention's effect】
According to the first and second aspects of the invention, by clarifying the reforming process of the Oldham ring, even if a boundary lubrication state occurs in the sliding portion between the Oldham ring and both the orbiting scroll and the fixed member. Since the Oldham ring can be easily dealt with by modifying it, it is convenient when the Oldham ring is made of the same material as the orbiting scroll and the fixed member, or when the orbiting scroll and the fixing member are made of different materials. There is an advantage that can be dealt with using
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a scroll compressor showing a first embodiment of the present invention. FIG. 2 is an exploded perspective view of essential parts of the compressor of FIG. 1. FIG. FIG. 4 is a cross-sectional view showing a reforming state of an Oldham ring of a scroll compressor according to a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 2a Rotor 2b Stator 3 Orbiting scroll 3a Projection shaft 4 Fixed scroll 5 Compression mechanism 6 Oldham ring 7 Fixing member 8 Oil reservoir 8a Oil 9 Oil guide 10 Support structure 11 Compression chamber 12 Suction port 13 Discharge port 14 Suction pipe 15 Discharge pipe 16 Crankshaft 17 Protrusion 18 Protrusion 19 Groove 20 Groove 21 Slider 22 Support structure 23 Steam treatment layer 24 Nitriding treatment layer

Claims (2)

As the refrigerant, a mixed refrigerant obtained by mixing at least one kind or two or more kinds of a fluorocarbon hydrogen refrigerant group is used, and an electric motor, a turning scroll driven by the electric motor, and a fixed scroll are disposed inside the sealed container. In the scroll compressor in which the scroll compressor for compressing the refrigerant is arranged, the Oldham ring that supports the orbiting scroll so that the orbiting scroll does not rotate with respect to the fixed scroll is moved for the support. A scroll compressor formed of a different material from both the fixed member and the orbiting scroll that are supported so that the Oldham ring improves wear resistance with respect to the fixed member and the orbiting scroll. A scroll compressor that has been steamed on the surface . The scroll compressor according to claim 1, wherein the Oldham ring is further subjected to gas soft nitriding after being subjected to steam treatment .

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