JPH0615867B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor used, for example, for refrigeration or air conditioning, and particularly to a scroll member suitable for improving productivity and reliability.

[Conventional technology]

FIG. 2 is a schematic sectional view of an essential part showing an example of a conventional scroll compressor. In FIG. 2, the compression element portion 14 is composed of a fixed scroll member 4 and an orbiting scroll member 5, and the two are combined to form a compression chamber 8. The fixed scroll member 4 is composed of a bottom plate 4a in which spiral teeth 4b are formed upright and an end plate 4c, and has a suction port 6 and a discharge port 9. The orbiting scroll member 5 is composed of a bottom plate 5a, which is formed by erecting teeth 5b having the same shape as the above-mentioned teeth but opposite winding directions, an end plate 5c, and a boss portion 5e. In frame 10,
The fixed scroll member 4 is fixed, the orbiting scroll member 5 is supported via an Oldham coupling 11, and the crankshaft 12 is supported by a bearing portion 10a.
The eccentric shaft 12a at the tip of the crankshaft 12 is inserted into the boss portion 5e of the orbiting scroll member 5.

In the scroll compressor configured as described above, when the crankshaft 12 is rotated by an electric motor (not shown),
The orbiting scroll member 5 connected to this orbits, but its rotation is hindered by the Oldham's joint 11, so that the fluid is compressed by the compression principle (described in detail later) according to FIG. That is, the fluid sucked from the suction port 6 is sucked into the suction chamber 7
It enters, is compressed by the compression chamber 8, and is discharged from the discharge port 9 provided in the central portion of the fixed scroll member 4. The fluid pressure generated at this time acts on the orbiting scroll member 5, but the radial component force is supported by the crankshaft 12. Further, the pressure in the space 13 (hereinafter referred to as back pressure) is set to an appropriate pressure between the suction pressure and the discharge pressure so as to overcome the axial component force, and the axial component force and the back pressure cause the axial direction. The difference from the force is supported as the surface pressure between the end plates 4c and 5c.

The compression principle will be described with reference to FIG. The figure shows only a cross section including the suction chamber 7 of the fixed scroll member 4 and the spiral tooth 4b, and a cross section of the spiral tooth 5b of the orbiting scroll member combined therewith. The fixed scroll member 4 is stationary with respect to the space, and the teeth 5b of the orbiting scroll member perform the orbiting motion while keeping the posture thereof constant with respect to the space. Due to this orbiting motion, the crescent-shaped compression chamber 8 formed between the teeth 4b of the fixed scroll member 4 and the teeth 5b of the orbiting scroll member is shown in FIG. (Showing a swirled state) and its volume is reduced, so that when the fluid taken into the compression chamber 8 is successively compressed to reach a predetermined compression ratio, the discharge port 9
Emitted from.

By the way, the compression chamber 8 has teeth 4b and teeth 5 as shown in FIG.
When the teeth 4b and 5b have insufficient dimensional accuracy, the compressed fluid taken into the compression chamber 8 leaks to the outside of the compression chamber to reduce the compression ratio and compression efficiency. Or, the teeth 4b and 5b may be damaged by the galling. In order to prevent this, particularly good surface roughness of the contact surfaces where the teeth 4b and 5b contact each other and perpendicularity of the teeth 4b and 5b with respect to the bottom plates 4a and 5a are required. As a material, good sliding characteristics (friction and wear characteristics) are required for the pressure contact sliding part, and in order to obtain a higher compression ratio and to increase the teeth and increase the fluid flow rate,
It is desirable that the teeth 4b and 5b have high fatigue strength. For this reason, the conventional fixed and orbiting scroll members 4 and 5 are made of a metal material having excellent wear resistance and fatigue strength, and are finished by precision machining with high precision on the order of μm. Since such precision machining requires a lot of man-hours and machining time, it has been a major obstacle to productivity in manufacturing conventional scroll fluid machines.

On the other hand, it is generally known that resin molding is effective as a manufacturing technique suitable for mass production without machining, and examples of precision molding such as plastic gears and plastic lenses are also known. It has been considered to solve the above-mentioned productivity problem by applying this plastic precision molding technique to a scroll member. For example, JP-A-58-91388,
Japanese Patent Application Laid-Open No. 61-294180 discloses a method of forming a resin layer on the surface of a metal core material to precisely form an orbiting scroll member and a fixed scroll member. FIG. 5 shows a schematic sectional view of the conventional resin-molded fixed scroll member 15 and the orbiting scroll member 16 manufactured by this method. In this, the resin layers 17 are formed with high precision by coating the surfaces of the metal cores 15d and 16d that face each other when the fixed scroll member 15 and the orbiting scroll member 16 are combined with each other.

Further, for example, Japanese Patent Application Laid-Open No. 61-38187 discloses a method in which a wear-resistant material such as metal is used for the end plate portions of both fixed and orbiting scroll members that slide in pressure contact with each other, and all other portions are formed of plastics. ing.

[Problems to be solved by the invention]

As described above, the precision machining of the scroll member may be omitted by applying the precision molding technique of resin. However, for practical use, it is indispensable to have high reliability in strength and sliding characteristics. In particular, sliding characteristics are important characteristics that are directly related to product performance. By the way, the main place where the sliding characteristic becomes a problem in the conventional metal scroll member is, as shown in FIG. 2, pressure contact sliding between the end plates 4c and 5c. The bottom plate 4a,
It is known to be a pressure contact slide between 5a and the tips of the teeth 4b, 5b. Therefore, the pressure contact sliding portion of the conventional resin molded scroll member will be examined.

First, in the conventional scroll member shown in FIG. 5, all the pressure contact sliding parts are made to slide between resins. Therefore, the sliding characteristics of the resins are important criteria for putting the scroll member into practical use. On the other hand, although there are many publicly known examples of general sliding characteristics of resins, it seems that no example showing sliding characteristics of scroll members, for example, sliding characteristics in a turning motion without rotation is found. Therefore, it was decided to clarify the problem by carrying out an element test simulating the sliding condition of the scroll member.

FIG. 6 is a schematic cross-sectional view of a main part for explaining an element test. The swivel test piece 19 is a metal cylinder, the fixed test piece 18 is a metal disk, and the surfaces facing each other are covered with a resin layer 20 having a thickness of 1 mm. The swivel test piece 19 makes a swivel motion at a predetermined number of rotations with respect to the fixed test piece 18 while maintaining a constant posture without rotating. The fixed test piece 18 is fixed so as not to rotate, and is pressed against the swivel test piece 19 with a pressing force F of a predetermined magnitude. A certain amount of mechanical oil is dripped on the pressure contact sliding surface between both test pieces. In this way, the friction coefficient μ and the amount of wear (the amount of decrease in the thickness of the resin layer 20) H after the elapse of a certain time are measured, and the surface pressure P (= (pressing force F) / (contact area)) Sought a relationship. Generally, even when the surface pressure P is large, the friction coefficient μ and the wear amount H
It can be said that a small value is a preferable condition for the scroll member.

The test results are shown by the solid line in FIG. 7 as a function of the friction coefficient μ and the surface pressure P, and in FIG. 8 as a function of the wear amount H and the surface pressure P. The friction coefficient μ and the wear amount H in these figures are relative values to the values obtained with the conventional metal scroll member, and the surface pressure P
Is a relative value to the rated value of the conventional metal scroll member.

The following three resins were used. Resin A is a resin composition in which a filler such as carbon fiber is filled in a polyimide resin having excellent heat resistance, resin B is a resin composition in which quartz fine particles are filled as a filler in an epoxy resin having excellent heat resistance, resin C Is a polyimide resin having excellent heat resistance and flexibility.

From these results, the following points were clarified regarding the pressure contact swivel sliding characteristics of the resins. That is, in both the resins A and B, the friction coefficient μ and the wear amount H rapidly increase at the surface pressure P near the rated value, and the surface pressure Po at which the increase starts is higher in the resin B than in the resin A. Further, the resin C retains a low value of the friction coefficient μ with respect to the increase of the surface pressure P and exhibits excellent characteristics in this sense, but the wear amount H
Increases as the surface pressure P increases. In comparison with application to scroll members, resin C has excellent conformability to local contact such as one-sided contact, but inferior wear resistance. To improve this, resins A and B with fillers are viewed from both the friction coefficient and the wear amount. However, the surface pressure resistance is poor. At the present time, at least, no resin having particularly excellent sliding characteristics is found as compared with the resins studied here. As described above, the conventional resin-molded scroll member in which the resins slide with each other (Japanese Patent Laid-Open No. 58-9138).
8, JP-A-61-294180) was found to have a problem in sliding characteristics.

Next, in the conventional scroll member (Japanese Patent Laid-Open No. 61-38187) in which the end plate portion, which is the pressure contact sliding portion, is made of metal, and the other portion is made of plastics, sliding is performed between the metal pieces of the end plate portion. However, since the machining of the end plates of the orbiting and fixed scroll members is required, the productivity is inferior, and the elastic modulus of molding plastics is generally much lower than that of metal. When used in the conventional scroll compressor shown, the scroll member, in particular, the fixed scroll member with a large internal / external pressure difference and a large external diameter, may undergo large deformation, which may cause galling and abnormal wear. There were cases where sex was a problem.

An object of the present invention is to provide a scroll compressor using a resin-molded scroll member that is excellent in productivity and reliability by improving the above-mentioned problems in sliding characteristics.

[Means for solving problems]

SUMMARY OF THE INVENTION The present invention is a combination of a fixed scroll member and an orbiting scroll member each having an end plate and spiral teeth integrally erected on the end plate so as to face each other with their teeth facing inward. In the scroll compressor in which the orbiting scroll member is orbitally moved without rotation, gas is compressed and discharged in the compression chamber formed by the fixed and orbiting scroll members. , 20 to 1, respectively
In the case where the end plates of both scroll members are main pressure contact sliding parts, the pressure contact sliding parts are composed of a metal core material surface having a surface roughness of 00 μm Rmax and metal tooth bottom surfaces covered with a resin layer. When one end plate surface is a resin surface and the other end plate surface is a metal surface, and the main pressure contact sliding part is between the tooth top surface and the tooth bottom surface of both scroll members. The press contact sliding portion is formed such that each tooth tip surface is a resin surface and each tooth bottom surface is a metal surface of a metallic sliding plate disposed on the coated resin layer. It is characterized by that.

[Action]

The pressure-contact sliding parts of the fixed scroll member and the orbiting scroll member have good sliding characteristics because one is made of resin and the other is made of metal. The metal forming the other side of the pressure contact sliding part provides good thermal conductivity that prevents the temperature rise of the sliding part, high hardness that does not impair surface roughness due to sliding, and oil retention, thus improving sliding characteristics. . Further, productivity is improved because no machining finishing is required except for the metal surface of the press contact sliding portion. Further, since the teeth of both scroll members are each formed by coating the surface of the metal core material having a surface roughness of 20 to 100 μmRmax with a resin layer, not only is it possible to perform precision resin molding of the teeth, but also the resin It has higher rigidity than a single tooth, and does not cause large deformation even in scroll members with large internal and external pressure differences and large external diameters, and therefore galling and abnormal wear occur during operation of the scroll compressor. There is no.

〔Example〕

1 (a) and 1 (b) are schematic sectional views showing examples of a fixed scroll member and an orbiting scroll member in a scroll compressor of the present invention. The fixed scroll member 2 is
A surface of the bottom plate 2a of a cast iron as-cast core material 2d (details described later), which is a metal core material in which spiral-shaped teeth 2b are formed upright on the bottom plate 2a, excluding the surface opposite to the tooth formation and the mirror plate 2c is resin. The resin layer 1 is coated with (described later in detail) to form the resin layer 1 and the end plate 2c.
The pressure contact sliding surface 2c 'is machined. The orbiting scroll member 3 is formed by forming the resin layer 1 by coating the surface of the as-cast iron core material 3d manufactured in the same manner as the fixed scroll member except the tooth-forming surface of the bottom plate 3a with a resin. And has a crank bearing portion 3e into which a crank shaft (not shown) is fitted.

The core materials 2d and 3d are cast iron castings, and the surface roughness thereof is about 50 μm as the casting surface due to the grain size control of the sand in the mold.
It is Rmax. By setting this surface roughness,
The adhesiveness with the resin layer 1 becomes extremely good.

Regarding the outer dimensions of the teeth 2b and 3b coated with the resin layer 1, as shown in FIG. 9, in the tooth cross section, a taper of θ = 1.5 ° is provided in the toothbrush direction of the tooth b, and the tip and There is a 1mm radius at the base. By making the shapes of the teeth 2b and 3b of the fixed and orbiting scroll members the same, as shown in FIG. 10, they can be combined without a gap.

The resin layer 1 has a thickness of about 1 mm. The resin is made by filling quartz fine particles as a filler in epoxy resin with excellent heat resistance,
It is a resin composition whose linear expansion coefficient substantially matches the linear expansion coefficient of the core material. The resin layer 1 is formed on the surface of the core material by precision molding by vacuum / injection compression molding.

The sliding characteristics of this example were obtained by the element test shown in FIG. The fixed test piece 18 was made of cast iron not covered with the resin layer 20, and the resin layer 20 of the swivel test piece 19 was the resin B (used in this example) described in the section [Problems to be Solved by the Invention]. (Corresponding to resin) and resin A. The results are shown in broken lines in FIG. 7 as the relationship between the friction coefficient μ and the surface pressure P and in FIG. 8 as the relationship between the wear amount H and the surface pressure P. The results for resin A are A ′ and the results for resin B are shown. Was designated as B '. Compared with the case of pressure contact sliding between resins (solid line), in the case of pressure contact sliding between metal and resin (broken line) as in this embodiment, the friction coefficient μ and wear amount H of both resins A and B are The surface pressure resistance characteristics are improved, and in particular, the resin B used in this example withstands the surface pressure P twice the rated value.

Since this embodiment is a scroll member having a high rigidity with a metallic core material and provided with a mirror plate, the mirror plate 2c of the fixed scroll member 2 and the mirror plate 3c of the orbiting scroll member 3 are the main pressure contact sliding portions, for example, In principle, the bottom plate 2a of the fixed scroll 2 and the tips of the teeth 3b of the orbiting scroll member 3 are designed so as not to contact with each other, so that the sliding characteristics are not deteriorated even if the surfaces of the resins face each other.

According to the embodiment described above, the as-cast cast iron core material 2 is used.
Since the surfaces of d and 3d are coated with a resin for precision molding, a tooth coated with a resin layer 1 having a high dimensional accuracy of the order of μm can be obtained, and the adhesiveness to the core material is good and the conventional resin is used. There is an effect that the fixed scroll member 2 and the orbiting scroll member 3, which have better sliding characteristics than the molded scroll member, can be obtained. Further, as compared with the conventional all-metal scroll member manufactured by precision machining, processing time and the number of steps are reduced, productivity is improved, and capital investment efficiency can be improved. Furthermore, if the orbiting scroll member 3 has the same outer shape as the orbiting scroll member made of conventional precision machining, the weight of the orbiting scroll member 3 can be reduced, so that the centrifugal force and the bearing load are reduced, and the reliability of the scroll compressor is reduced. It has the ripple effect of improving productivity or reducing costs.

In the above examples, as-cast iron was used as the metal core material, but the present invention is not limited to this, and for example, an Al cast product may be used. Others, forged products, plastic processed products,
It may be a metal core material such as a rough product or a powder metallurgy product. Further, the core materials of the fixed scroll member 2 and the orbiting scroll member 3 do not have to be the same, for example, the core material of the fixed scroll member 2 is made of cast iron, and the orbiting scroll member 3 is used.
The core material may be made of Al. Further, the core material of the orbiting scroll member 3 may be a semi-metal product such as ceramics. Also, the surface roughness of the core material is set to 50 μmRmax,
According to the research conducted by the present inventors, when the surface roughness is 20 to 100 μmRmax, the adhesiveness to the resin layer 1 is good.

As the outer shape of the tooth, taper angle θ = 1.5 °, R = 1mm
However, if the taper angle θ is 1.5 ° or more, the mold releasability when removing from the mold is good, and if R is 0.5 mm or more, the moldability is good.

The thickness of the resin layer 1 is about 1 mm, but it may be determined to be 0.5 mm or more in relation to the tooth shape. Although the epoxy resin is used as the resin, a polyimide resin or the like may be used as long as it has excellent heat resistance and environment resistance (withstands refrigerant and oil in a compressor for air conditioning), and has excellent molding and adhesiveness.
Further, although quartz fine particles are used as the filler, fine particles such as aluminum oxide and mica may be used alone or in combination, and as a solid lubricant, molybdenum disulfide,
You may mix and use graphite powder, fluororesin, such as PTFE (polytetrafluoroethylene) resin.

In the above embodiment, the resin layer 1 of the end plate is the orbiting scroll member 3
Of the fixed scroll member 2 formed on the end plate 3c of the
Although the metal machined surface 2c 'is used, conversely, the resin layer 1 may be formed on the end plate 2c of the fixed scroll member 2, and the end plate 3c of the orbiting scroll member 3 may be the metal machined surface.

Another embodiment will be described with reference to FIG. FIG. 11 is a sectional view showing the fixed scroll member 21. The orbiting scroll shown in FIG. 1 (b) is used. The fixed scroll member 21 forms a resin layer 1 by coating a core material 21d similar to the metal core material 2d in the first embodiment with a resin except for the surfaces of the bottom plate 21a and the end plate 21c opposite to the teeth. At that time, the sliding surface 21 of the end plate 21c
The sliding plate 22 made of metal and forming c'is embedded and integrally formed. The sliding plate 22 is a thin metal plate in which a ring or a part of the ring is arranged side by side on the circumference, and the surface roughness of the sliding surface is at least 0.2 to 1 μmRmax. The fixed scroll member 21 needs to be machined on the mating surface 21c 'of the end plate 21c with the frame 10. However, the surface roughness may be rougher than the sliding surface, and the fixed scroll in the first embodiment is the same. Since the processing time is shorter than that of the member 2, it is possible to further improve the productivity.

In FIG. 11, the inner periphery of the sliding plate 22 is aligned with the molding die for the resin layer 1, but the invention is not limited to this.
For example, as shown in FIG. 12, alignment may be performed with the groove provided in the end plate portion 21c of the metal core member 21d and the outer peripheral portion of the sliding plate 22, or as shown in FIG. The sliding plate 22 may be inserted and installed after resin molding.

Further, although the fixed scroll member 21 of the present embodiment has been described as having a metal core material, the present invention is not limited to this, and other materials, for example, ceramics having a rigidity similar to that of metal are used as the core material. You may

Although the present embodiment has described the structure of the fixed scroll member 21, on the contrary, the same structure can be applied to the orbiting scroll member 3 shown in FIG. 1 (b).

The third embodiment is shown in FIG. FIG. 14 is a cross-sectional view of an essential part in a state where the teeth 23b of the fixed scroll member 23 and the teeth 24b of the orbiting scroll member 24 are combined. First, the orbiting scroll member 24 will be described. The orbiting scroll member 24 is made of resin except for the surface opposite to the tooth formation of the bottom plate 24a of the core member 24d similar to the metal core member 3d in the first embodiment and the sliding surface of the end plate (not shown). To form the resin layer 1, and at that time, the sliding surface of the bottom plate 24a (the sliding surface with the tips of the teeth 23b of the fixed scroll 23) 2
It is formed by embedding and integrally molding a metal sliding plate 25 to be 4a '. The sliding plate 25 is a spiral thin metal plate related to the shape of the teeth 24b, and has the property of the eleventh aspect.
It is similar to the sliding plate 22 in the figure. The fixed scroll member 23 is also the sliding plate 2 like the orbiting scroll member 24.
5 is embedded as a sliding surface 23a 'of the bottom plate 23a.

According to this embodiment, in the scroll member having the end plate shown in FIGS. 1 (a) and 1 (b), it is possible to deal with the case where the bottom plate and the tooth tip are in sliding contact with each other due to overloading, etc. This has the effect of further improving the reliability of the characteristics. Further, a scroll member without a mirror plate is conventionally known, but in the case of such a scroll member, since the tip end portion of the tooth and the bottom face portion of the bottom plate are pressure contact sliding parts, the configuration of this embodiment is applied. It is extremely effective to secure the reliability of the sliding characteristics.

At the corners of the sliding plate 25, strength reliability tends to be insufficient due to insufficient thickness t of the resin layer 1 and stress concentration due to the notch effect. In such a case, as shown in FIG. 15, the corners of the sliding plate 25 are removed, and the thickness t ₂ of the resin layer 1 at the bottom of the bottom plate 24a is made larger than the thickness t ₁ of the other portions. It will be improved. Further, as shown in FIG. 16, by providing a groove, for example, a semicircular groove having a radius R ₁ in the root portion of the tooth 26b of the core member 26d, the above-mentioned problem is improved and the above-mentioned FIG. In the embodiment shown in (1), the radius R of the tooth root is restricted to be the same as the tooth tip, and the radius of curvature R of the tooth root of the core material is limited. On the other hand, in the present embodiment, the radius R ₁ Is unrelated to R, the core material 26d
It has the effect of alleviating the stress concentration at the root of the tooth and improving the strength reliability.

In the above embodiment, the sliding plate 25 is embedded and molded at the same time when the core material 24d is covered and molded with resin, but the sliding plate 25 may be inserted and installed after the core material is covered and molded.

Another embodiment relating to the teeth of the scroll member is shown in FIG. FIG. 17 is a cross-sectional view of the main parts showing the tip of the tooth. A resin layer 1 is formed by coating the surface of a core material d similar to the metal core material 2d in the first embodiment with a resin, and the outer shape of the resin-formed tooth b at the tip cross section is: The corner portion is R ₂ and the central portion is an arc having a radius of R ₂ . R ₃ is mainly a small value that enables resin molding, for example, R ₃ = 0.5 mm, R ₂ is a sufficiently large value, for example, 3 times the thickness of the tooth tip, and the tip end radius R ₄ of the core material d is Is a value that is not directly related. On the other hand, in order to prevent the compressed fluid from leaking from the compression space formed by the tooth and the bottom plate to the adjacent compression space, it is effective to have a large seal width at the tip of the tooth. By the way, the tooth tip shape in the first embodiment (first
FIG. 8 shows a sectional view of the main part. ) Seal width a
When the thickness of the teeth is about 3.5 mm, which is the same as that of the teeth of the conventional scroll member, considering the taper angle θ and the radius R of the tip, a is about 0.5 mm. In contrast, in this embodiment of FIG. 17, it is possible to reduce the tooth tip corner portion R _3, also an effective seal width a 'by a large central portion R ₂ of about 1.5 mm, the resin It is effective in improving the performance of the scroll compressor using the scroll member molded in Step 1. Further, when the tooth tips slide on the sliding surface of the bottom plate, the tooth tips have a radius of curvature of R ₂ , so that the formation of a lubricating oil film is facilitated and the reliability of sliding characteristics is improved.

As a special case of this embodiment, the shape shown in FIG. 19 in which the central portion of the tooth tip is flat is obtained.

In the third embodiment, as shown in FIG. 16, the root of the tooth 26b has an R having the same radius as the tip of the tooth, but as shown in FIG. 1
By using the tooth tip shapes of the embodiments shown in FIGS. 7 and 19, it is possible to reduce the final clearance at the time of tooth combination, and the degree of freedom in designing the tooth shape is increased.

FIG. 21 shows still another embodiment of the present invention. FIG. 21 is a sectional view showing the surface portion of the resin layer 26. In this embodiment, in the resin layer of the scroll member described in the first embodiment, at least the portion that slides in pressure contact is formed by the resin layer 26. The resin layer 26 forms the inner layer 26b with the molding resin described in the first embodiment.
The surface of 6b is a thin layer of a polyimide resin (which corresponds to the resin C described in [Problems to be solved by the invention]) having excellent flexibility, heat resistance and friction characteristics on the surface of 6b. 26a is formed. Since the pressure contact sliding portion of the scroll member of this embodiment is formed of the resin layer 26, the effect of the surface layer 26a of the resin layer 26, that is, the friction coefficient μ of the resin C shown in FIG. By maintaining a low value up to P, it is possible to obtain a highly reliable scroll member that does not cause a problem in sliding characteristics such as galling due to an increase in local surface pressure such as one-sided contact.

Explaining the method of forming the resin layer 26, a separately prepared resin film for the surface layer 26a is placed on the surface corresponding to the resin layer 26 in the resin molding die, and at the same time, the core material is placed and the vacuum / The resin layer 26 is formed by precision molding by injection compression molding.

The resin layer 26a on the surface is not limited to a polyimide resin, but may be any resin having excellent heat resistance, flexibility, and friction characteristics, such as an epoxy resin and a fluororesin such as PTFE (polytetrafluoroethylene) resin. But it's okay. Also,
The resin layer 26 has a two-layer structure integrally formed, but the present invention is not limited to this, and a polyimide resin film serving as the surface layer 26a may be adhesively bonded after forming the inner layer 26b, or the average surface pressure may be reduced. When the temperature is low, a resin film corresponding to the resin layer 26a may be inserted and installed in the sliding portion after the inner layer 26b is molded.

〔The invention's effect〕

According to the present invention, the weight of both fixed and orbiting scroll members can be reduced, and the sliding characteristics of the pressure contact sliding portions of both scroll members can be improved, and the sliding of either one of the scroll members can be improved. Since it is not necessary to machine finish the surfaces other than the metal surface, productivity in manufacturing can be improved. Further, since the teeth of both scroll members are each made of a metal core material integrated with a metal end plate and covered with a resin layer, the scroll member has high rigidity and little deformation, so the sliding characteristics are reliable. The property is further improved.

[Brief description of drawings]

1 (a) and 1 (b) are schematic sectional views showing a fixed scroll member and an orbiting scroll member, respectively, according to a first embodiment of the present invention, and FIG. 2 is a schematic view showing an example of a conventional scroll compressor. 3 is a schematic cross-sectional view of a part, FIG. 3 to FIG. 3 are cross-sectional views for explaining the compression operation of the scroll compressor according to FIG. 2, and FIG.
FIG. 5 is an enlarged sectional view of an essential part showing teeth of both fixed and orbiting scroll members in the figure, FIG. 5 is a sectional view showing an example of a conventional fixed and orbiting scroll member having a resin coating, and FIG. FIG. 7 and FIG. 8 are schematic cross-sectional views of essential parts for the purpose, and FIG. 9 is an enlarged cross-sectional view of essential parts showing details of the vicinity of the tooth in FIG.
FIG. 11 is a sectional view of an essential part showing a combined state of a fixed scroll member and an orbiting scroll member according to FIG. 1, and FIG. 11 is a schematic sectional view showing a fixed scroll member according to a second embodiment of the present invention. 12 and 13 are schematic cross-sectional views of a main part showing another embodiment according to FIG. 11, and FIG. 14 is a third embodiment of the present invention.
15 is a cross-sectional view of a main part showing a combined state of the fixed scroll member and the orbiting scroll member according to the embodiment of the present invention, and FIGS. 15 and 16 are cross-sectional views of the main part of the other embodiment according to FIG.
FIG. 17 is a cross-sectional view of essential parts showing teeth of a scroll member according to another embodiment of the present invention, FIG. 18 is a cross-sectional view of essential parts showing teeth of a scroll member according to the first embodiment, FIG. 19 and FIG. 20 is a cross-sectional view of relevant parts of a tooth of another embodiment of a scroll member, and FIG. 21 is a cross-sectional view of essential parts showing a resin layer of a scroll member according to yet another embodiment of the present invention. 1 ... Resin layer, 2 ... Fixed scroll member 3 ... Orbiting scroll member, 2a, 3a ... Bottom plate 2b, 3b ... Teeth 2c, 3c ... End plate 2c '... Sliding surface, 2d, 3d ... ... Core material 21 ... Fixed scroll member, 22,25 ... Sliding plate 26 ... Resin layer, 26a ... Surface layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuaki Kikuchi 502 Jinritsucho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. (72) Eiji Maeda 390 Muramatsu, Shimizu-shi, Shizuoka Hitachi, Ltd. Shimizu Plant (72) Inventor Yu Kunikata, 390 Muramatsu, Shimizu City, Shizuoka Prefecture, Hitachi Ltd., Shimizu Plant (72) Inventor, Yasuyuki Kanai, 390, Muramatsu, Shimizu City, Shizuoka Prefecture, Hitachi Ltd., Shimizu Plant (72) Inventor Aizo Kaneda, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd., Hitachi, Ltd., Production Technology Research Institute (72) Inventor, Shozo Nakamura, 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture, Hitachi, Ltd. 56) References JP-A-61-38187 (JP, A)

Claims (3)

[Claims] 1. A fixed scroll member in which a fixed scroll member and an orbiting scroll member each having an end plate and spiral teeth integrally upright on the end plate are combined so as to face each other with their teeth facing inward. With respect to the scroll compressor in which the orbiting scroll member is orbited without rotating, the gas is compressed and discharged in the compression chamber formed by the fixed and orbiting scroll members. 20 to 1 at the bottom
In the case where the end plates of both scroll members are main pressure contact sliding parts, the pressure contact sliding parts are composed of a metal core material surface having a surface roughness of 00 μm Rmax and metal tooth bottom surfaces covered with a resin layer. When one end plate surface is a resin surface and the other end plate surface is a metal surface, and the main pressure contact sliding part is between the tooth top surface and the tooth bottom surface of both scroll members. The press contact sliding portion is formed such that each tooth tip surface is a resin surface and each tooth bottom surface is a metal surface of a metallic sliding plate disposed on the coated resin layer. A scroll compressor characterized in that 2. The resin composition for forming the resin layer is a resin composition obtained by mixing quartz fine powder and optionally a solid lubricant in an epoxy resin. The scroll compressor described. 3. The resin surface of the pressure contact sliding portion has an inner layer made of a resin having excellent heat resistance and wear resistance and a surface layer made of a resin having excellent heat resistance and friction characteristics which is rich in flexibility. 3. The scroll compressor according to claim 1, wherein the scroll compressor is provided by a resin layer having a two-layer structure.