JP2002054585A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor in which leakage of a refrigerant gas from the lap tooth tip face is precluded to the utmost without using any thrust plate. SOLUTION: A coating film made from a solid lubricant consisting of PTFE (polytetrafluoroethylene), molybdenum disulfide, or carbon, or a mixture thereof is provided through a baking process on the abutting surface of a revolving scroll 7 with a stationary scroll 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a coating made of a solid lubricant on a contact surface between a fixed scroll and an orbiting scroll, and using the coating to form a tip of a wrap. The present invention relates to a configuration in which a gap between surfaces is reduced as much as possible to prevent leakage of a high-pressure refrigerant gas.

[0002]

2. Description of the Related Art A conventional scroll compressor is configured, for example, as shown in FIG. A scroll compressor 40 shown in FIG. 5 has a compression unit and an electric motor disposed in a closed container 41, and the compression unit includes a fixed scroll 43 in which a spiral wrap 43 a is formed on a head plate, and a fixed scroll 43. A spiral wrap 44 on the head plate so as to mesh with the wrap
and a main frame 42 that supports the main shaft of the electric motor and presses the orbiting scroll 44 against the fixed scroll 43, and forms a plurality of compression chambers between the wraps. are doing. On the upper surface of the closed container 41, there are provided a suction pipe 48 for introducing the refrigerant gas into the compression section, and a discharge pipe 49 for leading the compressed high-pressure refrigerant gas to the outside. The refrigerant gas sucked into the compression section from the fixed scroll 43 and the orbiting scroll 4
The compression chamber formed by the engagement of the wrap with the wrap 4 gradually compresses toward the center to become a high pressure. The high-pressure refrigerant gas is discharged from a discharge hole 47 formed in the fixed scroll 43 into a discharge chamber 45,
9 to the outside.

A separating force acts on the fixed scroll 43 and the orbiting scroll 44 due to the high pressure refrigerant gas in the compression chamber, and the separating force causes the wrap 43a.
And 44a, a small gap is formed on the tooth tip surface, and refrigerant gas leaks from the gap. To prevent this,
Spiral thrust plates 50 and 51 are disposed on the tip surfaces of the wraps 43a and 44a, and the thrust plates 50 and 51 minimize the generation of gaps.

[0004] However, the thrust plates 50 and 51 formed in a spiral shape require a lot of trouble in manufacturing, have difficulties in machining, and are expensive to manufacture. Was desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is formed between a tooth top surface of a wrap standing upright on a fixed scroll and a tooth bottom surface of an orbiting scroll without using a thrust plate. Scroll and a gap formed between the tip surface of the wrap erected on the orbiting scroll and the root surface of the fixed scroll are reduced as much as possible to prevent leakage of high-pressure refrigerant gas from the compression chamber. An object is to provide a compressor.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixed scroll in which a compression section and an electric motor are arranged in a closed container, and the compression section is provided with a spiral wrap on a head plate. The orbiting scroll, which is formed in substantially the same shape as the wrap and meshes with the wrap to generate a plurality of compression chambers, is provided on a head plate, and the orbiting scroll supports the main shaft of the electric motor. A main frame that is pressed against the fixed scroll, and a crankshaft formed at the tip of the main shaft is supported by the orbiting scroll and driven to orbit, and the refrigerant gas is compressed by a suction pipe provided in the closed container. To the scroll compressor, which is compressed by the compression chamber to generate high-pressure refrigerant gas, and is led out through a discharge chamber through a discharge pipe provided in the closed container. Te, and the fixed scroll, the contact surface between the orbiting scroll has a structure of forming a film comprising a solid lubricant.

[0007] The contact surface may be a tip surface of the wrap of the fixed scroll and / or a tip surface of the wrap of the orbiting scroll.

The contact surface may be a bottom surface of the wrap of the fixed scroll and / or a bottom surface of the wrap of the orbiting scroll.

[0009] Further, the contact surface is a tooth tip surface and a bottom surface of a wrap of the fixed scroll and the orbiting scroll.

[0010] Further, the coating is formed by applying a solvent in which a solid lubricant is dissolved to the contact surface and baking.

Further, a powdery solid lubricant in which the coating is pressed against the contact surface and solidified is formed by a baking process.

Further, the solid lubricant comprises PTFE (polytetrafluoroethylene), molybdenum disulfide, carbon, or a compounding agent thereof.

Further, the thickness of the film is in the range of 1 to 15 μm.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a scroll compressor according to the present invention, and FIGS. 2 to 4 are sectional views of a main part. As shown in FIG. 1, a scroll compressor 1 according to the present invention includes a compression unit 3 including a fixed scroll 6, an orbiting scroll 7 and a main frame 5 in a closed container 2, and a main shaft 9 for orbiting the orbiting scroll 7. And an electric motor 4 provided. The orbiting scroll 7 forms a spiral wrap 7a on a head plate, and is formed on the head plate of the fixed scroll 6 to have substantially the same shape as the wrap 7a, and meshes with the wrap to form a plurality of compression chambers 8. 6a are formed. The main frame 5 presses the orbiting scroll 7 against the fixed scroll 6 and supports the main shaft 9 of the electric motor 4. At the tip of the main shaft 9, a crank shaft connected to the orbiting drive shaft of the orbiting scroll 7 and performing an eccentric rotational motion is provided, and at the lower end of the periphery of the orbiting scroll 7 as a rotation preventing device. An Oldham ring 10 is mounted.

A suction pipe 13 for introducing the refrigerant gas to the compression section 3 and a discharge pipe 14 for guiding the high-pressure refrigerant gas to the outside are provided on the upper surface of the closed vessel 2. The low-pressure refrigerant gas externally introduced into the compression section 3 by the suction pipe 13 is supplied to the orbiting scroll 7 by the electric motor 4.
And the compression chamber 8 is compressed as the compression chamber 8 moves from the outer peripheral part to the central part in order to become high pressure. The high-pressure refrigerant gas is discharged from a discharge hole 12 formed in the fixed scroll 6 into a discharge chamber 11 and discharged into the discharge pipe 14.
Is derived outside.

A coating made of a solid lubricant is formed on the contact surface between the fixed scroll 6 and the orbiting scroll 7 of the scroll compressor 1 according to the present invention. In the first embodiment, as shown in FIG. 2A, a coating 15 made of a solid lubricant is formed on the tooth tip surface of the wrap 7a of the orbiting scroll 7, and the tip of the wrap 7a is formed by the coating 15. The generation of a gap between the surface and the tooth bottom surface of the wrap of the fixed scroll 6 is reduced as much as possible to prevent leakage of the high-pressure refrigerant gas. Or Figure 2
As shown in (B), the wrap 6 of the fixed scroll 6
A film 16 made of a solid lubricant is formed on the tooth apex surface of a, and the film 16 prevents leakage of the high-pressure refrigerant gas. In the second embodiment, as shown in FIG. 3A, a coating 17 made of a solid lubricant is formed on the bottom surface of the wrap 7a of the orbiting scroll 7, and the tip 17 of the wrap 6a is formed by the coating 17. The generation of a gap between the wrap of the orbiting scroll 7 and the tooth bottom surface is reduced as much as possible.
The leakage of the high-pressure refrigerant gas is prevented. Alternatively, as shown in FIG. 3B, a coating 1 made of a solid lubricant is formed on the bottom surface of the wrap 6a of the fixed scroll 6.
8 is formed to prevent leakage of the refrigerant gas, which has been increased in pressure by the coating 18. In the third embodiment, as shown in FIG. 3A, a coating 15 is formed on the tooth tip surface of the wrap 7a of the orbiting scroll 7, and a coating 17 is formed on the tooth bottom surface. Or Figure 3
As shown in (B), the wrap 6 of the fixed scroll 6
The film 16 is formed on the tooth apex surface of a, and the film 18 is formed on the tooth bottom surface.

The step of forming the coatings 15 to 18 will be described. First, the fixed scroll 6 and the orbiting scroll 7 are heated to a range of 50 ° C to 60 ° C. Next, PTFE (polytetrafluoroethylene), molybdenum disulfide, carbon, or a particulate solid lubricant obtained by mixing them is dissolved in an organic solvent, and the solvent is brushed or the like to use the orbiting scroll 7 and the fixed scroll 6. Is applied to the contact surface. Next, the fixed scroll 6 and the orbiting scroll 7 to which the lubricant has been applied are heated in a heating furnace at about 190 ° C. for about 40 to 60 minutes, and the liquid applied lubricant is baked. The solid lubricant having undergone the printing process is formed as a film having a thickness of about 1 to 15 μm on the contact surface between the orbiting scroll 7 and the fixed scroll 6.

In the second step of forming the coatings 15 to 18, first, the fixed scroll 6 and the orbiting scroll 7 are heated to a range of 50 ° C. to 60 ° C. Next, the granular solid lubricant is processed into powder, and the lubricant processed into powder is pressed against the contact surface between the orbiting scroll 7 and the fixed scroll 6 by a press or the like to be solidified. Next, the fixed scroll 6 and the orbiting scroll 7 with the lubricant solidified on the contact surface are heated at about 190 ° C. for 40 ° C. in a heating furnace.
Heat for about 60 minutes to perform lubrication baking. The solid lubricant having undergone the baking process is applied to the tip of the wrap 7 a of the orbiting scroll 7 and the wrap 6 of the fixed scroll 6.
A film having a thickness of about 1 to 15 μm is formed on the tooth apex surface a.

When the coating 15 and the coating 16 are formed to have a thickness of 15 μm or more by a baking process, the orbiting scroll 7 orbits with respect to the fixed scroll 6 so that the coating 15 and the coating 16 are formed. The coating 16
Is adjusted so that the surface of the film surface is worn to form a film having a thickness of about 15 μm.

When the refrigerant gas introduced into the compression section 3 from the suction pipe 13 is compressed in the compression chamber 8 to a high pressure, a repulsive force acts on the orbiting scroll 7 and the fixed scroll 6. A gap is formed between the tooth tip surface of the wrap 7a and the tooth tip surface of the wrap 6a due to the same reaction force,
Although the refrigerant gas may leak from the gap to reduce the compression efficiency, the coatings 15 to 18 made of solid lubricant are formed on the contact surface between the orbiting scroll 7 and the fixed scroll 6. Accordingly, leakage of the refrigerant gas can be reduced as much as possible.

[0021]

As described above, according to the present invention,
The orbiting scroll and the fixed scroll are formed with a film made of a solid lubricant on the contact surface, and even if a repelling force is applied to the orbiting scroll and the fixed scroll by the refrigerant gas having a high pressure in the compression section, the film is formed. As a result, the scroll compressor in which the generation of a gap between the tooth tips of the wrap is prevented as much as possible and the leakage of the refrigerant gas is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a scroll compressor according to the present invention.

FIG. 2A is a cross-sectional view illustrating a main part of the orbiting scroll according to the first embodiment of the present invention. FIG. 2B is a sectional view of a main part showing a fixed scroll according to the first embodiment of the present invention.

FIG. 3A is a cross-sectional view illustrating a main part of an orbiting scroll according to a second embodiment of the present invention. (B) is a sectional view of a principal part showing a fixed scroll according to a second embodiment of the present invention.

FIG. 4A is a cross-sectional view illustrating a main part of an orbiting scroll according to a third embodiment of the present invention. (B) is a sectional view of a principal part showing a fixed scroll according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a scroll compressor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Airtight container 3 Compressor 4 Electric motor 5 Main frame 6 Fixed scroll 6a Lap 7 Orbiting scroll 7a Lap 8 Compression chamber 9 Main shaft 10 Oldham ring 11 Discharge chamber 12 Discharge hole 13 Suction pipe 14 Discharge pipe 15 Coating 16 Coating 17 Coating 18 Coating

Claims (8)

[Claims] 1. A fixed scroll in which a compression unit and an electric motor are provided in a closed container, and the compression unit is formed in a spiral shape on a head plate, and is formed in substantially the same shape as the wrap. An orbiting scroll in which wraps that mesh with each other to generate a plurality of compression chambers are erected on a head plate, and a main frame that supports the main shaft of the electric motor and presses the orbiting scroll against the fixed scroll. The crankshaft formed at the tip of the orbit is supported by the orbiting scroll and driven to orbit, and refrigerant gas is introduced into the compression section from a suction pipe provided in the closed container, and compressed by the compression chamber to generate a high-pressure refrigerant. A scroll compressor that generates gas and guides the gas to the outside through a discharge chamber from a discharge pipe provided in the closed container; the fixed scroll and the orbiting scroll; Of the contact surface, a scroll compressor, characterized in that by forming a film comprising a solid lubricant. 2. The scroll compressor according to claim 1, wherein the contact surface is a tip surface of a wrap of the fixed scroll and / or a tip surface of a wrap of the orbiting scroll. 3. The scroll compressor according to claim 1, wherein the contact surface is a bottom surface of the fixed scroll wrap and / or a bottom surface of the orbiting scroll wrap. 4. The scroll compressor according to claim 1, wherein the contact surface is a tooth tip surface and a bottom surface of a wrap between the fixed scroll and the orbiting scroll. 5. The scroll compressor according to claim 1, wherein the coating is formed by applying a solvent in which a solid lubricant is dissolved to the contact surface and baking the coating. 6. The scroll compressor according to claim 1, wherein the powdery solid lubricant in which the coating is pressed against the contact surface and solidified is formed by a baking process. 7. The scroll compressor according to claim 1, wherein the solid lubricant comprises PTFE (polytetrafluoroethylene), molybdenum disulfide, carbon, or a combination thereof. 8. The scroll compressor according to claim 1, wherein the thickness of the coating is in a range of 1 to 15 μm.