JP2000303973A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent compressed gas from leaking by shrinking the gap between wall surfaces with no processing accuracy enhanced in the spiral shape of a scroll compressor. SOLUTION: This scroll compressor is so constituted that wall surfaces in a spiral shape each as an involute one, are projected out of an end plate, and are mutually joined together so as to be formed into a compression mechanism part formed out of a stationary scroll, and of a turning scroll. In this case, a thin film 200 having a solid lubricant agent is formed in the vicinity of the center part 3a of one spiral shaped scroll out of the stationary scroll 10 or the turning scroll 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment of a scroll for making a scroll compressor for a refrigerant used in a refrigerating machine, an air conditioner or the like inexpensive and efficient.

[0002]

2. Description of the Related Art In a conventional scroll compressor, as shown in FIG. 5, a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside a closed casing 1, and a compression mechanism is attached to a rotor 5 of the electric motor 3. 2 is fixed. The lower part of the sealed container 1 is a lubricating oil reservoir 7.

The compression mechanism 2 includes a fixed scroll 10, an orbiting scroll 13 which meshes with the fixed scroll 10 to form a plurality of compression work spaces 14, and prevents only the orbiting of the orbiting scroll 13 to perform only the orbital movement. The swing drive shaft 16 is inserted into an eccentric bearing 18 inside a journal shaft 17 formed at one end of the crankshaft 6, and the crankshaft 6 supports the journal shaft 17. It is supported by a main bearing member 20 having a bearing 19 and a sub-bearing 21 that supports a shaft portion of the crankshaft 6 on the side opposite to the journal shaft 17.

As shown in FIG. 5, in a conventional scroll compressor, a fixed scroll 10 and an orbiting scroll 13 are meshed with each other without being subjected to a surface treatment after machining, so that a spiral inner wall 100, an outer wall 101, Upper surface 10
2. A compression working space 14 is formed on each surface of the bottom surface 103 to perform refrigerant compression.

[0005]

However, there is a gap between the inner wall 100 and the outer wall 101 forming the compression working space 14 in the above-mentioned conventional scroll compressor, and the compressed refrigerant gas leaks, thereby reducing the efficiency. In order to improve the precision of machining from a certain level in order to further reduce the gap, the manufacturing cost rises, and it is difficult to achieve both high efficiency and low manufacturing cost. ing. The present invention is to solve the above conventional problems, forming a thin film having a solid lubricant that prevents leakage in the spiral shape portion where the pressure of the compressed gas increases,
It is an object of the present invention to provide a scroll compressor that is low in cost because the processing accuracy is not improved and that is more efficient because leakage of compressed gas is reduced.

[0006]

According to the present invention, a thin film having a solid lubricant is formed near the center of a spiral-shaped portion. Since the solid lubricant is the main component of the thin film, the contact part is cut off on the opposing machined surface during operation, and the thin film conforms to the shape of the machined surface side of the inner wall and outer wall, and leakage of compressed gas is reduced. Since it can be prevented, the efficiency is high, and it is not necessary to raise the processing accuracy, low cost can be realized and the conventional problems can be solved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a first embodiment, a thin film having a solid lubricant is formed near a central portion of a spiral shape of at least one of a fixed scroll and an orbiting scroll. This can be easily formed by spraying a solution containing the solid lubricant on the central portion while rotating the fixed scroll or the orbiting scroll for forming a thin film of the solid lubricant. At this time, if the fixed scroll or the orbiting scroll is heated in advance, the liquid can be applied uniformly without dripping. As a result, during operation, the thin film of the solid lubricant is abraded by sliding on the opposed wall surfaces of the spiral shape, and the shapes of the wall surfaces match, thereby preventing leakage of the compressed gas that has been compressed and the pressure has increased. The efficiency can be improved. Further, since there is no need to improve the machining accuracy of the wall surface, inexpensive manufacturing costs can be realized.

In the second embodiment, when the fixed scroll and the orbiting scroll have different spiral shapes, a thin film having a solid lubricant is formed near the center of the wall surface of the scroll having the smaller spiral shape. Things.

In the third embodiment, a coating having a solid lubricant is formed on at least one of the spiral inner wall and the outer wall of at least one of the fixed scroll and the orbiting scroll. This is to set the spray position in synchronization with the rotation so that the fixed scroll or orbiting scroll that wants to form a thin film of solid lubricant can be sprayed on the inner or outer wall where the thin film should be formed by spraying the solution containing the solid lubricant. It can be easily formed by moving. At this time, if the fixed scroll or the orbiting scroll is heated in advance, the liquid can be applied uniformly without dripping. Due to this, the opposing walls of the spiral shape during operation,
The thin film of the solid lubricant is abraded by sliding, and the shapes of the wall surfaces coincide with each other, so that it is possible to prevent the leakage of the compressed gas which has been compressed and the pressure has increased, thereby improving the efficiency. Furthermore, since there is no need to improve the machining accuracy of the wall,
Inexpensive manufacturing costs can also be realized.

In the fourth embodiment, when the spiral shape is different between the fixed scroll and the orbiting scroll, a thin film having a solid lubricant is formed on the inner wall side of the scroll having the smaller spiral shape. .

In the fifth embodiment, when the spiral shape is different between the fixed scroll and the orbiting scroll, a thin film having a solid lubricant is formed on the outer wall side of the scroll having the larger spiral shape. .

In a sixth embodiment, a thin film is formed by using a solid lubricant mainly composed of fluorinated resin as a main material, with the main material being difluidized molybdenum.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In a conventional scroll compressor, as shown in FIG. 5, a stator 4 of a motor 3 for driving a compression mechanism 2 is fixed inside a closed vessel 1, and a rotor 5 of the motor 3 is fixed. , A crankshaft 6 for driving the compression mechanism 2 is fixed. The lower part of the sealed container 1 is a lubricating oil reservoir 7.

The compression mechanism 2 has a fixed scroll 10, an orbiting scroll 13 which meshes with the fixed scroll 10 to form a plurality of compression work spaces 14, and prevents only the orbiting scroll 13 from rotating. The swing drive shaft 16 is inserted into an eccentric bearing 18 inside a journal shaft 17 formed at one end of the crankshaft 6, and the crankshaft 6 supports the journal shaft 17. It is supported by a main bearing member 20 having a bearing 19 and a sub-bearing 21 that supports a shaft portion of the crankshaft 6 on the side opposite to the journal shaft 17.

In FIG. 1 and FIG. 2, a compression working space 14 of the scroll compressor is formed by meshing a fixed scroll 10 and an orbiting scroll 13. 13c, outer wall 13d, bottom surface 150 and top surface 151
A thin film 200 having a solid lubricant which has been applied and baked before assembly is formed. A thin film 200 having a solid lubricant applied and baked before assembly is formed. This thin film 200 can be easily applied by spraying a solution containing a solid lubricant from obliquely above with the orbiting scroll rotated. The scroll compressor compresses the refrigerant by reducing the compression working space 14 from the outside toward the center, so that the pressure increases as approaching the center. Therefore, when the shape accuracy is poor, the compression leaks from the gap. The more the gas goes to the center, the more the efficiency of the compressor decreases. After the operation is started, the outer wall 10c of the fixed scroll 10 and the inner wall 13c of the orbiting scroll forming the compression working space 14 perform a sliding sliding motion by the orbiting motion when the operation of the compressor is started. The thin film 200 formed according to the shape of the outer wall 10c of the fixed scroll 10 wears the portion of the thin film 200a. The thickness of the thin film 200 is less than the precision obtained by machining,
Even if the gap 201 between the inner scroll 13c and the inner wall 13c of the orbiting scroll 13 is not completely filled, the leakage of the compressed gas can be reduced, so that a thickness of 2 to 7 μm is sufficient. It is possible to increase the amount of the solid lubricant which is easily worn so that the performance can be secured at the early stage of the copying. In other words, in the thin part of the solid lubricant, it is difficult to improve the processing accuracy in the part where the pressure of the refrigerant increases and the processing accuracy greatly affects the leakage of the compressed gas, that is, in the vicinity of the center of the fixed scroll and the orbiting scroll. In this case, the gap between the wall surfaces is combined, and unnecessary portions are abraded by operation on the opposing wall surfaces, so that the accuracy of machining is good at present, and an inexpensive and highly efficient scroll compressor can be provided.

In this embodiment, the case where a thin film is formed on the orbiting scroll is described as an example. However, the same effects can be obtained by forming the film on the fixed scroll or both.

Further, a thin film 200 is formed on the central portion 13a of the small spiral shape. When two spiral shapes are different in a scroll compressor,
The radius that can be turned is determined by the smaller spiral shape. That is, the turning radius is determined outside the inner wall of the small spiral and the outer wall of the large spiral, and a gap exists between the walls near the center even if the wall has good shape accuracy. During operation, the temperature rises, and the respective spiral shapes are deformed due to thermal expansion. However, since the spiral shapes are originally different, it is not realistic to predict the amount of change and manufacture each spiral shape. Therefore, by forming the thin film 200 in the portion where the gap between the wall surfaces near the center exists, the portion 200a where the thin film 200 having the solid lubricant contacts the opposing side wall surface is worn and the gap is reduced.
The gap at the time of operation can be reduced without producing a complicated shape by predicting the shape when the temperature rises during the operation of the compressor, and the efficiency of the compressor can be increased.

(Embodiment 2) In FIGS. 3 and 4, the compression work space 14 of the scroll compressor is
The orbiting scroll 13 is formed by meshing the orbiting scroll 13 with a thin film 201 having a solid lubricant which has been applied and baked before assembly on the inner wall 13c, the bottom surface 160 and the upper surface 161 of the orbiting scroll 13. ing. The wall surface of the scroll is machined with a rotating tool such as an end mill, but the inner wall has a longer contact length between the rotating tool and the wall than the outer wall, so the straightness and squareness increase when the sharpness of the rotating tool decreases. In other words, it has a shape in which the shape accuracy is likely to be deteriorated. After the start of operation, the outer wall 10 of the fixed scroll 10 forming the compression work space 14
d and the inner wall 13c of the orbiting scroll perform a sliding sliding motion by the orbiting motion when the operation of the compressor is started, and the thin film 201 formed on the inner wall 13c of the orbiting scroll 13
20 follows the shape of the outer wall 10 d of the fixed scroll 10.
The part of 1a is worn away. Since the thickness of the thin film is less than the precision obtained by machining, the leakage of the compressed gas can be reduced without completely filling the gap 301 between the outer wall 10d of the fixed scroll 10 and the inner wall 13c of the orbiting scroll 13;
A thickness of from 7 to 7 microns is sufficient, so that it is possible to formulate with an increased amount of solid lubricant which is subject to wear, so that the shape can be followed immediately after operation and the performance can be ensured early. In other words, it is a thin film of solid lubricant that fills the area where it is difficult to improve the processing accuracy, that is, fills the gap between the wall surfaces when the fixed scroll and the orbiting scroll are combined, and unnecessary parts are worn by opposing wall surfaces by machining. The current accuracy is good, and the amount of solution containing a solid lubricant can be reduced as compared with the case where a thin film is formed at the center, so that an inexpensive and highly efficient scroll compressor can be provided. it can. The effect of the present invention is not impaired even if it slightly adheres to the back wall surface.

In this embodiment, the case where a thin film is formed on the inner wall of the orbiting scroll has been described as an example. However, the present invention can be applied to the case where the thin film is formed on the outer wall or the inner wall or both of the sliding scroll and the fixed scroll. The effects are equivalent.

Next, an example in which a thin film is formed on the inner wall of a small spiral shape when the spiral shapes are different will be described. If the two spiral shapes are different in the scroll compressor, the radius that can be turned by the smaller spiral shape is determined. That is, the turning radius is determined outside the inner wall of the small spiral and the outer wall of the large spiral, and a gap exists between the walls near the center even if the wall has good shape accuracy. During operation, the temperature rises, and the respective spiral shapes are deformed due to thermal expansion. However, since the spiral shapes are originally different, it is not realistic to predict the amount of change and manufacture each spiral shape. Furthermore, the wall surface of the scroll is machined with a rotating tool such as an end mill.In this case, the inner wall has a longer contact length between the rotating tool and the wall than the outer wall. It has a shape that increases in size, that is, the shape accuracy tends to deteriorate. Therefore, when a thin film having a solid lubricant is formed on the inner wall of a small spiral shape, the portion where the thin film comes into contact with the mating side wall surface is worn out, so that it is not necessary to manufacture a complicated shape that predicts the shape during operation, and it is not necessary to manufacture the thin film with a precision The gap at the time of operation can be reduced without improving the accuracy of the inner wall, which easily deteriorates, and a scroll compressor with high efficiency and low cost can be provided.

Also, when the spiral shape is different, when a thin film is formed on the outer wall of the large spiral shape, the gap between the sliding sliding surface and the other side is reduced by abrasion of the thin film to reduce the gap. Yes, the effects of the present invention can be obtained.

Further, even if each of them slightly adheres to the rear wall surface, the effect of the present invention is not hindered.

[0024]

As is apparent from the above embodiment, according to the first aspect of the present invention, a thin film having a solid lubricant is formed near the center of the spiral shape, and the thin film having a solid lubricant is formed and operated as a compressor. Also, the surface of the thin film is worn so as to have the shape of the opposing wall surface, the gap between the wall surfaces is reduced, and the leakage of the compressed gas at the high pressure center is reduced, so that high efficiency can be achieved. In addition, since it is not necessary to improve the accuracy of the machining of the wall surface, a high-efficiency and low-cost scroll compressor can be provided.

As is apparent from the above embodiment, claim 2
According to the invention described in the above, when the spiral shape is different, by forming a thin film having a solid lubricant near the center of the wall of the smaller spiral shape, and assembling and operating as a compressor, the small spiral shape There is a gap in the center even in the ideal spiral shape, but when the gap rises due to the operation of the compressor, the surface of the thin film is worn down following the shape of the opposite wall, and Since the gap existing in the scroll compressor can be reduced, the leakage of the compressed gas can be reduced, and a highly efficient scroll compressor can be obtained. Further, since there is no need to predict the spiral shape during operation and produce a complicated spiral shape, a highly efficient and inexpensive scroll compressor can be provided.

As is apparent from the above embodiment, claim 3
According to the invention described in above, at least one of the fixed scroll or the orbiting scroll, by forming a thin film having a solid lubricant on at least one of the spiral inner wall or the outer wall, the rotary tool in the scroll processing and In the situation where surface accuracy on the inner wall side, which is generated due to the contact length of the spiral shape, is difficult to obtain, the thin film surface is worn down following the shape of the opposite wall surface, and the gap between the wall surfaces is reduced, resulting in leakage of compressed gas. , And high efficiency can be achieved. Further, since there is no need to improve the accuracy of machining the inner wall, a high-efficiency and low-cost scroll compressor can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view of a compression working space showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a schematic view of a compression work space according to a second embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a cross-sectional view of a scroll compressor showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 fixed scroll 13 orbiting scroll 14 compression work space 200, 201 thin film 200a, 201a worn part 301 gap

Claims (7)

[Claims] 1. A scroll compressor having a fixed scroll and a orbiting scroll formed by forming a compression chamber by forming a spiral wall surface such as an involute on a head plate and combining the spiral wall surfaces with each other. A scroll compressor, wherein a thin film having a solid lubricant is formed near a central part of a spiral shape of at least one of the fixed scroll and the orbiting scroll. 2. The fixed scroll and the orbiting scroll have different spiral shapes, and a thin film having a solid lubricant is formed near the center of the spiral wall surface of the scroll having the smaller spiral shape. Item 2. The scroll compressor according to Item 1. 3. A scroll compressor having a fixed scroll and a orbiting scroll formed by forming a compression chamber by forming a spiral wall surface such as an involute on a head plate and combining the spiral wall surfaces with each other. A scroll compressor, wherein a thin film having a solid lubricant is formed on at least one of the inner wall side and the outer wall side of at least one of the fixed scroll and the orbiting scroll. 4. The fixed scroll and the orbiting scroll have different spiral shapes, and a thin film having a solid lubricant is formed on the inner wall side of the spiral wall surface of the scroll having the smaller spiral shape. The scroll compressor as described. 5. The fixed scroll and the orbiting scroll have different spiral shapes, and a thin film having a solid lubricant is formed on the outer wall side of the spiral wall surface of the scroll having the larger spiral shape. The scroll compressor as described. 6. The scroll compressor according to claim 1, wherein the solid lubricant is mainly composed of molybdenum disulfide. 7. The scroll compressor according to claim 1, wherein the solid lubricant is mainly composed of a fluororesin.