JP2006046102A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction of lubrication performance caused by dissolution of carbon dioxide in a lubricating oil compound for a refrigerator and ensure sufficient lubricity in, in particular, high load. <P>SOLUTION: Polyalkylene glycol to which hydroxylated fullerene is added is used as lubricating oil or additive. Consequently, hydroxylated fullerene is a spherical molecule which has the size of about 1 nm and whose skeleton is composed of carbon, but is uniformly dispersed in polyalkylene glycol having OH group and is supplied to a sliding part together with polyalkylene glycol to provide solid lubrication action in, in particular, the sliding part in partial contact with solid, prevent wear and seizure by its non-adhesion property and rolling action, and provide high lubricity by supplementing lubricity of polyalkylene glycol in high load. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor mainly used for refrigeration and air conditioning for business use and home use.

Conventionally, this type of compressor consists of (A) a refrigerant mainly composed of carbon dioxide, and (B) at least one selected from polyoxyalkylene glycol and polyvinyl ether, and has a kinematic viscosity at 100 ° C. of 5 cSt or more. Some use a lubricating oil composition for refrigerators containing oil (see, for example, Patent Document 1). High lubricity and high sealing performance can be obtained in a carbon dioxide atmosphere.
Japanese Patent Laid-Open No. 10-046169

  However, in the conventional configuration, there is an influence of carbon dioxide dissolution on the characteristics of the base oil, and the actual viscosity of the base oil is greatly reduced particularly at high loads. For this reason, the oil film may be cut off and a solid contact portion may appear, so an antiwear agent such as an extreme pressure additive is added to supplement the lubricity of the base oil. That is, the lubricating oil composition for refrigerators has a problem of preventing a decrease in lubrication performance that occurs with the dissolution of carbon dioxide, and ensuring sufficient lubricity particularly at high loads.

  The present invention solves the above-described conventional problems, and uniformly disperses the fullerene hydroxide, which is a derivative of fullerene, in the lubricating oil, and supplements the lubricity of the lubricating oil by the solid lubricating action of the fullerene hydroxide. An object is to provide a compressor having sufficiently high durability.

  In order to solve the above conventional problems, the compressor of the present invention uses a polyalkylene glycol to which a fullerene hydroxide is added as a lubricating oil or an additive.

  As a result, the fullerene hydroxide is a spherical molecule having a size of about 1 nm and a skeleton made of carbon, but has an OH group and is uniformly dispersed in the polyalkylene glycol. The fullerene hydroxide is supplied to the sliding portion together with the polyalkylene glycol, and exhibits a solid lubricating action especially in the sliding portion in local solid contact. The non-adhesiveness and rolling action prevent wear and seizure, and high lubricity can be obtained by supplementing the lubricity of polyalkylene glycol at high loads.

  The compressor of the present invention can supplement the lubricity of polyalkylene glycol with fullerene hydroxide, and can sufficiently improve the durability of the compressor with respect to high-load operation in which solid contact appears.

  In the first invention, the polyalkylene glycol added with fullerene hydroxide is used as a lubricating oil or additive, so that the fullerene hydroxide can exhibit a solid lubricating action to supplement the lubricity of the polyalkylene glycol. .

  In the second invention, in particular, the fluid machine of the first invention can be made inexpensive by making the addition amount of fullerene hydroxide 5 wt% or less.

  According to the third invention, in particular, the soft material is cut off from the sliding surface by using the soft material or the soft material in which hard particles are dispersed as the sliding member constituting the compressor of the first or second invention. can do.

  In the fourth aspect of the invention, in particular, a long-life solid lubricating layer is formed by using a material having a fine porous layer at least on the sliding surface as a sliding member constituting the compressor of the first or second aspect of the invention. Can be formed.

  In the fifth aspect of the invention, in particular, by using carbon dioxide as the working fluid of the compressor according to any one of the first to fourth aspects, the compressor can be expanded to a large-capacity refrigeration facility or a hot water supply facility. it can.

  In the sixth aspect of the invention, in particular, the use of the HFC refrigerant as the working fluid of the compressor according to any one of the first to fourth aspects can greatly reduce the component cost.

  In the seventh aspect of the invention, in particular, the HC refrigerant is used as the working fluid of the compressor according to any one of the first to fourth aspects of the invention, so that the refrigerator can be made small and highly efficient.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a scroll compressor according to the first embodiment of the present invention.

  In FIG. 1, 1 is a sealed container, 2 is a suction pipe, and 3 is a discharge pipe. A compression mechanism 4 and a motor unit 5 are built in the sealed container 1, and lubricating oil 6 is stored in the lower part of the sealed container 1. The lubricating oil contains polyalkylene glycol as a base oil and 5 wt% or less of fullerene hydroxide is added. The working fluid is carbon dioxide.

  The compression mechanism 4 includes a fixed scroll 8 fixed to the frame 7, a turning scroll 9 disposed opposite to the fixed scroll 8, an Oldham ring 10 provided between the turning scroll 9 and the frame 7, and a motor part. It is comprised from the crankshaft 11 connected. The fixed scroll 8 includes an end plate 8a, a spring 8b, a suction port 8c, and a discharge port 8d. The suction pipe 2 is connected to the suction port 8c, and a discharge valve 12 is installed in the discharge port 8d.

  FIG. 2 shows a cross-sectional view of the orbiting scroll 9. The orbiting scroll 9 includes end plates 9a and 9b, springs 9c, and bearings 9d. The height of the springs 9c is set lower than the height of the springs 8b of the fixed scroll 8. The frame 7 is provided with a seal member 14 in the annular groove 13, and the inside of the seal member 14 is set to a high pressure. With this pressure, the orbiting scroll 9 is pressed against the fixed scroll 8 and the axial gap between the orbiting scroll 9 and the fixed scroll 8 is sealed.

  FIG. 3 shows a cross-sectional structure of the surface layer portion of the end plate 9 a of the orbiting scroll 9. The orbiting scroll 9 is an Al—Si alloy 17 in which fine eutectic Si 16 that is hard particles is dispersed in Al 15 that is a soft base material. The end plate 9a is a sliding surface with a lot of Al15.

  Next, the operation will be described.

  The rotation of the motor unit is transmitted to the orbiting scroll 9 via the crankshaft 11 and causes the orbiting scroll 9 to orbit in cooperation with the Oldham ring 10. Splashes 9c and 8b of the orbiting scroll 9 and the fixed scroll 8 arranged at positions that mesh with each other by this orbiting motion inhale and compress carbon dioxide from the intake pipe 2 via the intake port 8c. The compressed carbon dioxide is discharged into the sealed container 1 from the discharge port 8d, and later led out of the sealed container 1 from the discharge pipe 3. The inside of the sealed container 1 is at a high pressure.

  Now, the inside of the seal member 14 is the discharge pressure, but carbon dioxide is a high differential pressure refrigerant, and the discharge pressure at a high load is very high. The end plate 9a of the orbiting scroll 9 is strongly pressed against the end plate 8a of the fixed scroll 8 by the pressure, so that sliding on the thrust surface becomes severe.

  On the other hand, the lubricating oil reaches the back of the orbiting scroll 9 from the lower part of the sealed container 1 through the crankshaft 11, lubricates the end plate 9 b, the seal member 14, and the Oldham ring 10, and then is supplied to the fixed scroll 8 and the orbiting scroll 9. .

  The fullerene hydroxide is supplied together with the polyalkylene glycol to the end plate 9a of the orbiting scroll 9 and the end plate 8a of the fixed scroll, and the fullerene hydroxide exerts a solid lubricating action by being interposed in the thrust surface that is locally in solid contact. That is, the lubricity of polyalkylene glycol can be supplemented by the non-adhesiveness of carbon and the rolling action of spherical molecules.

  When the load is further increased, a part of the fullerene hydroxide is embedded in the Al15 surface of the end plate 9a of the orbiting scroll 9 to form an extremely thin hard layer. As a result, Al15 can be blocked from the sliding surface.

  Since the durability of the compressor using carbon dioxide as a refrigerant is improved at a high load, the compressor can be deployed in a larger refrigeration facility at a low price.

  Similarly, a compressor using an HFC refrigerant, for example, a sliding vane type rotary compressor, similarly improves durability at high loads, so that a coating such as a lubricating film is not required and the cost of parts can be greatly reduced.

  Further, by using a mineral oil or POE in which a polyalkylene glycol added with fullerene hydroxide is added as an additive to a lubricating oil of a compressor using an HC refrigerant, durability at a high load can be similarly improved. As a result, a rolling piston type rotary compressor having a high pressure inside the sealed container can be used for the refrigerator, and the refrigerator can be made smaller and more efficient.

(Embodiment 2)
FIG. 4 is a cross-sectional structure of the orbiting scroll in the scroll compressor according to the second embodiment of the present invention.

  FIG. 4 shows a cross-sectional structure of the surface layer portion of the end plate 9 a of the orbiting scroll 9. The orbiting scroll 9 is an Al—Si alloy 17 in which fine eutectic Si 16 that is hard particles is dispersed in Al 15 that is a soft base material. Further, an anodized film 18 having a columnar structure and fine pores is formed on the surface layer portion of the end plate 9a.

  The anodic oxide film 18 has a film thickness of ½ or less of eutectic Si particles and exhibits a solid lubricating action under high surface pressure due to its brittleness. The fullerene hydroxide having a size of about 1 nm flows into and accumulates in fine pores of the anodized film 18 together with the polyalkylene glycol, and the fullerene hydroxide exhibits a solid lubricating action on the anodized film 18. As a result, the wear rate of the anodized film 18 becomes slow, and a long-life familiar layer can be formed.

  As described above, the compressor according to the present invention is greatly improved in durability at high loads by the fullerene hydroxide uniformly dispersed in polyalkylene glycol, and can be applied to hot water supply equipment and automotive air conditioners. .

Sectional drawing of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the turning scroll in Embodiment 1 of this invention Sectional organization chart of orbiting scroll in Embodiment 1 of the present invention Sectional organization chart of orbiting scroll in Embodiment 2 of the present invention

Explanation of symbols

6 Lubricating oil 9 Orbiting scroll 15 Al
16 Eutectic Si
18 Anodized film

Claims (7)

A compressor characterized in that polyalkylene glycol added with fullerene hydroxide is used as a lubricating oil or additive. The compressor according to claim 1, wherein the addition amount of the fullerene hydroxide is 5 wt% or less. The compressor according to any one of claims 1 to 2, wherein a soft material or a soft material in which hard particles are dispersed is used as a sliding member constituting the compressor. The compressor according to any one of claims 1 to 2, wherein a material having a fine porous layer on at least a sliding surface is used as a sliding member constituting the compressor. The compressor according to any one of claims 1 to 4, wherein carbon dioxide is used as a working fluid of the compressor. The compressor according to any one of claims 1 to 4, wherein an HFC refrigerant is used as a working fluid of the compressor. The compressor according to any one of claims 1 to 4, wherein HC refrigerant is used as a working fluid of the compressor.