JP2002250286A - Scroll type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type pump in which a fixed scroll and a movable scroll are light weighed, a dimension accuracy, a dimension stability and a friction/abrasion-resistance property are excellent, a pump performance is ensured, a productivity is high and a cost reduction can be realized. SOLUTION: In the air pump, the fixed scroll 4 in which a swirl blade 3 is formed on a flat surface of a flat plate part 2 of an end plate 1 and the movable scroll 5 in which a blade 3 having the same shape as the blade 3 and an opposite winding direction is formed on a flat surface of a flat plate 2 of another end plate 1 are combined while the blades 3 are opposed to each other. An air, i.e., a fluid suctioned into a closed space S formed between both scrolls 4, 5 is compressed by oscillating the movable scroll 5 against the fixed scroll 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a fixed scroll and a movable scroll, and the movable scroll is swung with respect to the fixed scroll so that the movable scroll is sucked into a closed space formed between the two scrolls. The present invention relates to a scroll pump for compressing a fluid.

[0002]

2. Description of the Related Art Conventionally, a fixed scroll and a movable scroll are provided, and the movable scroll is swung with respect to the fixed scroll to compress a fluid sucked into a closed space formed between the two scrolls. Scroll pumps are known. Further, in this type of scroll type pump, a fixed scroll in which spiral blades are formed on a flat plate portion plane of a head plate, and a winding having the same shape and opposite winding direction on the flat plate portion plane surface of another head plate. The movable scroll having the blades is combined with the blades facing each other.

[0003] In the conventional scroll type pump, generally, the fixed scroll and the movable scroll are formed of metal. That is, in order to obtain a high compression ratio, in particular, fatigue strength, surface finishing accuracy, wear resistance, and the like are required in the blade portion and the flat plate flat portion of the end plate. It is an expensive metal material having excellent wear resistance and fatigue strength, and has been finished with high precision on the order of μm by precision machining. However, in this case, many man-hours and processing time are required, resulting in a problem of low productivity and high cost.

[0004] As disclosed in Japanese Patent Application Laid-Open No. 59-79090, a scroll type pump which is inexpensive and has excellent productivity has been proposed. In this case, both or one of the fixed scroll and the movable scroll is formed of a synthetic resin. However, the gazette merely describes that the resin is injection-molded with a thermoplastic resin, but does not disclose any material for the synthetic resin, and has high dimensional accuracy required for fixed scrolls and movable scrolls. The specific material for obtaining fatigue strength and wear resistance is unknown.

In order to solve the above problem, as disclosed in JP-A-63-105293, a fixed scroll and a movable scroll are made of polyaminobismaleimide (polyaminobismaleimide filled with glass fiber, carbon fiber or aramid fiber). A scroll type pump made of PABM) has been proposed. In this case, it has high fatigue strength required for the fixed scroll and the movable scroll, is excellent in dimensional accuracy, does not require machining, is inexpensive, and has good productivity.

[0006]

However, in the scroll type pump disclosed in Japanese Patent Application Laid-Open No. Sho 63-105293 in the above prior art, a fibrous filler is filled in a synthetic resin which is a base of a molding material. In this case, the fibrous filler is oriented in the flow direction during molding and in a direction perpendicular to the direction of molding, and anisotropy occurs in the molding shrinkage and the coefficient of linear expansion. Then, since the contraction rate and the linear expansion coefficient are different between the end plate and the blade, the following problem occurs.

That is, there is a problem that the molding accuracy is poor due to a warp or the like generated in the end plate after the molding, and the warp tends to increase due to a difference in thermal expansion due to a temperature change, and the dimensional stability due to the environment is not good. . Therefore, the gap between the fixed scroll and the orbiting scroll becomes large, the discharge pressure decreases, and a problem arises in that power consumption increases due to an increase in sliding resistance due to the occurrence of one-side contact.

Japanese Unexamined Patent Publication (Kokai) No. 63-230901 discloses a method for manufacturing a scroll in which spiral blades are formed of synthetic resin by injection molding on a metal end plate. Here, the metal is thermally expanded in the mold due to the mold temperature, and the mold is filled with a molding material that is a synthetic resin.

In this case, the amount of heat shrinkage of the metal from the mold temperature to room temperature is different from the amount of heat shrinkage of the synthetic resin from the molding temperature to room temperature. The bonding strength with the synthetic resin is reduced, and the rattling between the members at the initial stage or during use is increased. Furthermore,
The amount of thermal expansion between the metal and the synthetic resin due to the temperature rise during use is also different, and the dimensional change is large.Moreover, it takes a lot of man-hours to produce a head plate with metal or to form blades on the head plate. It takes a lot of processing time, productivity is low, cost is high,
There was also a problem that the weight increased.

SUMMARY OF THE INVENTION The present invention has been made in order to solve all the problems in the prior art described above.
An object of the present invention is to provide a scroll type pump which is excellent in dimensional stability and friction and wear resistance, ensures pump performance, has high productivity, and can reduce costs.

[0011]

According to a first aspect of the present invention, there is provided a scroll type pump comprising a fixed scroll having spiral blades formed on a flat plate surface of a head plate, and a scroll provided on a flat plate surface of another head plate. Sealing formed between both scrolls by combining the movable scroll with the blade and the movable scroll having the same shape and the opposite winding direction, with the blades facing each other and swinging the movable scroll with respect to the fixed scroll. A scroll type pump for compressing a fluid sucked into a space is characterized in that the fixed scroll and the movable scroll are formed of a material obtained by mixing an isotropic filler with a synthetic resin.

Accordingly, in this case, since the fixed scroll and the movable scroll are formed using the synthetic resin as a base material, the scroll is lightweight, does not require machining such as cutting a metal, thereby improving productivity and reducing costs. . Moreover, since the molding material is a mixture of a synthetic resin and an isotropic filler, the fixed scroll and the movable scroll have excellent dimensional accuracy, dimensional stability, and friction and wear resistance.
Good pump performance is ensured.

That is, since the isotropic filler is blended with the synthetic resin, the molding shrinkage has no anisotropy and the molding accuracy is excellent. Therefore, the maximum discharge pressure of the pump is improved, the one-side contact that occurs when the dimensional accuracy is poor is prevented, and the friction and wear resistance is excellent. In addition, the anisotropy of the linear expansion coefficient is eliminated, the dimensional change due to the temperature change is reduced, and the pump characteristics are stabilized and the reliability is obtained even when the environment changes.

A scroll type pump according to a second aspect of the present invention is the scroll type pump according to the first aspect, wherein the isotropic filler has a substantially spherical shape.

Therefore, in this case, in particular, the anisotropy of the molding shrinkage and the coefficient of linear expansion is further reduced, the molding accuracy is further increased, and the thermal expansion deformation due to a change in the use environment is further prevented. .

According to a third aspect of the present invention, there is provided a scroll type pump according to the first or second aspect, wherein the synthetic resin serving as a base of the molding material is polyphenylene sulfide (PPS). .

Therefore, in this case, in particular, the synthetic resin serving as the base of the molding material is polyphenylene sulfide, and the polyphenylene sulfide has a low water absorption and a small coefficient of linear expansion. Is further reduced.

According to a fourth aspect of the present invention, there is provided a scroll type pump according to the third aspect, wherein the molding material contains an amorphous resin.

Therefore, in this case, compared with the case where polyphenylene sulfide which is a crystalline resin alone is used alone, a synthetic resin in which an amorphous resin is blended with the polyphenylene sulfide is used as a molding material, so that water absorption and water absorption can be improved. Further reduction of dimensional change due to temperature change is achieved. Moreover,
Lower mold shrinkage can be achieved, further increasing initial accuracy, thereby improving dimensional stability to environmental changes and reducing pressure leaks.

A scroll pump according to a fifth aspect of the present invention is the scroll type pump according to the fourth aspect, wherein the amorphous resin is polyether sulfone (PES).

Therefore, in this case, particularly, the polyether sulfone to be blended has a linear expansion coefficient as small as that of polyphenylene sulfide which is a crystalline resin among the amorphous resins, so that the shrinkage ratio is further reduced. As a result, dimensional accuracy such as warpage is further improved, and the linear expansion coefficient is reduced, so that dimensional stability against temperature change is also ensured.

A scroll type pump according to a sixth aspect of the present invention is the scroll type pump according to the fourth aspect, wherein the amorphous resin is polyphenylene ether (PPE).

Therefore, in this case, particularly, since the polyphenylene ether to be compounded has a low water absorption among the amorphous resins, the shrinkage can be further reduced, and the dimensional accuracy such as warpage can be reduced. The dimensional stability against water absorption is also ensured by further improving and lowering the water absorption.

A scroll type pump according to a seventh aspect of the present invention is the scroll type pump according to any one of the first to sixth aspects, wherein the molding material contains a wear-resistant low-friction material. It is characterized by.

Therefore, in this case, in particular, since the wear resistance and low friction material are mixed in the molding material, the friction coefficient on the sliding contact surface between the scrolls is reduced, and the power consumption for driving the pump is reduced. Since wear is reduced, durability can be improved.

The scroll type pump according to the eighth aspect of the present invention is the scroll type pump according to any one of the first to sixth aspects, wherein a portion where the fixed scroll and the movable scroll come into contact with each other has wear resistance. It is characterized by forming a low friction material layer.

Therefore, in this case, in particular, since the wear-resistant and low-friction material layer is formed at a portion where the fixed scroll and the movable scroll are in contact with each other, the friction coefficient at the same contact portion is formed by the wear-resistant and low friction material layer. Is reduced, power consumption for driving the pump is reduced, and wear is reduced, so that durability can be improved.

According to a ninth aspect of the present invention, there is provided the scroll type pump according to the first aspect, wherein at least a movable scroll,
The fixed scroll includes a blade having a predetermined involute curve portion, and a top plate having a minimum area where the movable scroll and the fixed scroll blade move at a predetermined turning radius.

Therefore, the top plate in the portion where the blades are present has a reinforcing effect by the blades, so that the molded product is less likely to warp, the outer diameter of the pump is reduced, and the pump can be downsized.

A scroll type pump according to a tenth aspect of the present invention is characterized in that, in the ninth aspect, the ratio of the blade thickness to the top plate thickness is approximately 1: 1.

Therefore, since the shrinkage ratios of the blade and the top plate are substantially equal, the warpage is reduced, and the scroll efficiency and noise are improved.

In the method of manufacturing a scroll type pump according to the present invention, the movable scroll and the fixed scroll are manufactured by any one of injection molding, injection compression molding, transfer molding and compression molding. It is characterized by that.

Therefore, by using the isotropic filler, the shrinkage ratio becomes substantially equal, and the influence of the orientation of the filler can be ignored, so that the productivity is improved and the product can be provided at low cost. .

According to a twelfth aspect of the present invention, there is provided a method of manufacturing a scroll type pump according to the eleventh aspect, wherein the position of the gate is set as the involute origin in the method of manufacturing the movable scroll and the fixed scroll.

Accordingly, when the material flows, the pressure distribution in the top plate can be reduced, and even at a position distant from the center of the top plate, the shrinkage ratio at the same radius becomes almost equal, so that warpage hardly occurs.

According to a thirteenth aspect of the present invention, there is provided the scroll type pump according to the first aspect, wherein at least the movable scroll and the fixed scroll have a predetermined involute curve portion, and the movable scroll and the fixed scroll have a predetermined orbit. The top plate has a minimum area that overlaps when moving with a radius, and a sliding portion that receives a thrust force is provided on an outer peripheral portion of the top plate.

Therefore, the sliding portions come into contact with each other, and by sliding the abrasion-resistant material against the sliding portions, wear of the blades and the top plate is suppressed and the life is extended.

A scroll type pump according to a fourteenth aspect of the present invention is characterized in that, in the thirteenth aspect, the thickness of the sliding portion on the outer peripheral portion of the top plate is made thicker than the top plate.

Therefore, by giving the rigidity of the outer peripheral portion of the top plate, the warp deformation of the outer peripheral portion can be reduced.

A method of manufacturing a scroll pump according to a fifteenth aspect of the present invention is characterized in that, in the fourteenth aspect, the outer peripheral portion of the top plate is post-processed to impart smoothness to the outer peripheral portion.

Accordingly, the smoothness of the sliding portion can be obtained, so that an increase in the amount of abrasion due to one-side contact and flapping of the movable scroll are suppressed, and noise and abnormal wear are eliminated.

A scroll type pump according to a sixteenth aspect of the present invention is the scroll type pump according to any one of the thirteenth to fifteenth aspects, wherein the abrasion-resistant material slides on the sliding portion on the outer peripheral portion of the top plate. Features.

Therefore, by providing a sliding portion on the outer peripheral portion of the orbiting scroll and sliding the wear-resistant material on the sliding portion, the wear of the blades is reduced, and it is possible to suppress the change over time of the characteristics.

According to a seventeenth aspect of the present invention, in the scroll type pump according to any one of the thirteenth to sixteenth aspects, the member that slides on the outer peripheral portion of the top plate is a material in which carbon fibers are mixed with PPS resin. It is characterized by.

Therefore, the wear is reduced, the life is prolonged, and the cost is reduced due to the excellent productivity.

The scroll pump according to claim 18 of the present invention is the scroll pump according to any one of claims 13 to 17, wherein the orientation direction of the carbon fibers of the material obtained by blending the carbon fibers with the PPS resin is parallel to the sliding direction. It is characterized by being arranged so that it becomes. Therefore, it has low wear,
Long life can be achieved.

[0047]

FIG. 1 shows a scroll type pump according to an embodiment of the present invention. The scroll type pump has a fixed scroll in which a spiral blade 3 is formed on a flat plate portion 2 of a head plate 1. 4 and a movable scroll 5 having blades 3 having the same shape and the opposite winding direction as the blades 3 formed on the plane of the flat plate portion 2 of another end plate 1, and combined with the blades 3 facing each other. Is an air pump for compressing air, which is a fluid sucked into a closed space S formed between the scrolls 4 and 5, by swinging the movable scroll 5.

Hereinafter, the structure of the scroll type pump, such as a mechanism for swinging the movable scroll 5, will be described in detail. That is, in the scroll pump, an Oldham ring 6 for preventing the movable scroll 5 from rotating,
A housing 7 for holding the Oldham ring 6, an eccentric cam 8 for revolving the orbiting scroll 5 with a constant radius, and a motor 9 for rotating the eccentric cam 8
And The two spiral blades 3 of the fixed scroll 4 and the movable scroll 5 are formed by, for example, an involute curve or an Archimedes spiral, and are combined and joined so that the two blades 3 face each other.

The movable scroll 5 has a key groove 10 formed on the bottom surface of the flat plate portion 2, and a key-shaped protrusion 11 protruding from the upper surface of the Oldham ring 6 slides in the key groove 10. The movable scroll 5 is freely engaged, and is movable by one degree of freedom. Further, as shown in FIG. 2, the Oldham ring 6 has a key-shaped protrusion 11 disposed on the lower surface thereof so as to be orthogonal to the protrusion 11, and the protrusion 11 is provided on the housing 7. The movable scroll 5 is further slidably engaged with a key groove (not shown) formed on the surface, and
The degree of freedom can be moved. That is, a pair of protrusions 11 are arranged and protruded above and below the Oldham ring 6, and the movable scroll 5 is a mechanism movable with two degrees of freedom with respect to the housing 7 via the Oldham ring 6.

In the center of the lower end surface of the eccentric cam 8, a fixing hole 12 is provided.
The rotating shaft 13 of the motor 9 is inserted and fitted into the fixing hole 12, and the rotational driving force of the motor 9 is transmitted to the eccentric cam 8. A circular hole 14 is formed in the upper end surface of the eccentric cam 8 at a position eccentric from the center thereof, and the circular hole 14 has a coupling shaft projecting from the center of the bottom surface of the movable scroll 5.
15 are inserted and fitted so as to freely slide in the rotation direction. Therefore, the eccentric cam 8 is integrally rotated by the rotation driving force of the motor 9, and the movable scroll 5 is swung in a horizontal plane without being rotated by the rotation of the eccentric cam 8 (revolves at a constant radius). I do.

In the above case, the movable scroll 5 may be pressed against the fixed scroll 4 in the radial direction so that the two blades 3 are always in contact and in close contact with each other.
For example, as shown in FIGS. 3 and 4, a radial moving groove 16 is formed in the eccentric cam 8, and a radially slidable slide bush 17 is engaged and housed in the moving groove 16.
A circular hole 14 into which the coupling shaft 15 of the movable scroll 5 is inserted and fitted, and an elastic body 18 such as a spring for urging the slide bush 17 in the radial pressing direction is provided in the moving groove 16. It may be attached and accommodated.

In this case, the movable scroll 5 is pressed in the radial direction by the elastic body 18 via the slide bush 17,
The movable scroll 5 is the same as the blade 3 of the fixed scroll 4
The blades 3 are securely brought into close contact with each other, air leakage is reduced, and a pressure drop is prevented. Even if the elastic member 18 is not provided, if the eccentric cam 8 and the movable scroll 5 can slide in the radial direction with respect to each other, a centrifugal force acts on the movable scroll 5 as the eccentric cam 8 rotates. Thus, the movable scroll 5 is pressed against the fixed scroll 4 in the radial direction by the same centrifugal force, so that both the blades 3 are always in contact with and brought into close contact with each other.

As shown in FIG. 5, the orbiting scroll 5 is moved by a ring-shaped pressing member 20 disposed below the orbiting scroll.
The fixed scroll 4 is pressed in the axial direction. In this case, a plurality of spring members 21 are provided on the upper surface of the housing 7, and the movable scroll 5 is elastically urged toward the fixed scroll 4 by the plurality of spring members 21. It is. Therefore, the tip of the blade 3 of the movable scroll 5 is attached to the end plate 1 of the fixed scroll 4.
Slidably in contact with the flat surface of the flat plate portion 2 without any gap, the hermeticity in this portion is ensured, and leakage of air pressure is further reduced.

The motor 9 is fixed to the lower part of the housing 7 and the fixed scroll 4 is fixed to the upper end 19 of the outer periphery of the housing 7 so that the movable scroll 5 and the Oldham ring 6 are held therebetween, and the lower surface of the outer edge is fixed. Then, the blades 3 of the scrolls 4 and 5 are combined and joined to face each other. In the scroll type pump having such a structure, the orbiting scroll 5 does not rotate and performs a swinging motion with a constant orbital radius in a planar manner, whereby the closed space formed between the scrolls 4 and 5 is formed. The air sucked into S is compressed. That is, both scrolls 4, 5
The closed space S formed therebetween is moved from the outside of the spiral of the blade 3 toward the center, and the volume of the closed space S is sequentially reduced, whereby the air is compressed.

In the scroll type pump according to this embodiment, the fixed scroll 4 and the movable scroll 5
The scroll pump according to the first aspect of the present invention is formed by using a material obtained by mixing an isotropic filler with a synthetic resin. For example, as a synthetic resin, polycarbonate, polyphenylene ether, polyether sulfone,
Thermoplastic resins such as polyetherimide, polyamide, polyacetal, polyester, polyphenylene sulfide, polyarylate, and polyetheretherketone, and thermosetting resins such as phenolic resin, epoxy resin, and unsaturated polyester can be used.

As the isotropic filler, spherical filler,
Irregular fillers, tetrapot-like fillers can be used. For example, spherical fillers include silica, glass beads, alumina, aluminum silicate, etc., and amorphous fillers include kaolin, calcium carbonate, magnesium oxide, titanium oxide, aluminum borate, alumina, silica, calcium silicate, talc, There are mica, glass powder, etc., and zinc oxide is a tetrapot-like filler.

Therefore, as an example, the following material properties were measured. That is, a material in which polyphenylene sulfide (PPS) as a synthetic resin is filled with 50% by weight of spherical glass beads as an isotropic filler, and
The material characteristics of a material in which the polyphenylene sulfide was filled with 70% by weight of spherical silica as an isotropic filler were measured. Further, as a comparative example, the characteristics of a material in which polyphenylene sulfide as a synthetic resin was filled with 50 wt% of glass fibers were measured. The comparative example is described in Japanese Patent Application Laid-Open No.
As shown in Japanese Patent No. 5293, it corresponds to a resin obtained by filling a synthetic resin as a base of a molding material with a fibrous filler. The measurement results are shown in the following [Table 1].

[0058]

[Table 1] The specific method of measurement is as follows. In other words, the shrinkage characteristics are such that the product shape is 50 mm long, 40 mm wide, 2 m thick
This is a measure of shrinkage calculated by measuring the dimensions of the flow direction of the material and the direction perpendicular to the flow direction after molding with a film gate using a flat plate of m. Regarding the thermal expansion characteristics, the flat molded product whose shrinkage characteristics were measured was subjected to a length of 5 mm in a flow direction of a material in a mold and a direction perpendicular to the flow direction,
It was cut out at a width of 2 mm and a thickness of 2 mm, and the coefficient of linear expansion was calculated from the dimensional change when heated from room temperature to 85 ° C.

As is apparent from the above [Table 1], in the case of a material containing a spherical isotropic filler such as glass beads or silica, almost no anisotropy appears in both shrinkage characteristics and thermal expansion characteristics. On the other hand, in the case of a material in which glass fibers, which are fibrous fillers, are filled and blended, a large anisotropy appears in both shrinkage and thermal expansion characteristics. Next, the blade 3 is 6 mm high, 1.3 mm thick, and
Of the height of the blade 3 and the deviation from the design value of the involute curve and the flatness of the end plate 1 of a molded product produced by injection molding of the movable scroll 5 having a thickness of 1.8 mm and a diameter of 35 mm by injection molding. Are shown in [Table 2].

[0060]

[Table 2] By the way, among the most important dimensions of the scroll molded product, the height of the blade 3, the involute curve, the end plate 1
Flatness. If the heights of the blades 3 vary, when the fixed scroll 4 and the movable scroll 5 are combined, a gap is generated between the tip portion of the blades 3 and the plane of the flat plate portion 2 of the end plate 1. If the accuracy of the involute curve is poor, a gap is created between the side surfaces of the blades 3 between the scrolls 4 and 5. If the flatness of the end plate 1 is poor, a problem as shown in FIG.

That is, the center of the end plate 1 is attached to the blade 3
In the case where a warp that is convex to the side is generated, the tip of the blade 3 comes into contact with the flat plate portion 2 of the end plate 1 near the center of the scroll molded product, and the gap between the two near the outer periphery is large. appear. When such a one-sided hit occurs,
The contact area becomes small, and the amount of wear increases due to the increase in pressure.

As described in JP-A-63-105293, which is described in connection with the prior art, when injection molding is performed using a material in which a fibrous filler is filled in a synthetic resin, the material is injected in the same direction as the material flows. Since the fibrous filler is easily oriented, it is extremely difficult to control the orientation of the fibrous filler. By the orientation of the fibrous filler in this way, the shrinkage in the fiber orientation direction in the molded product is small,
The shrinkage increases in the direction perpendicular to the fiber orientation. When the scroll shape is formed, if the shrinkage ratio has anisotropy, the accuracy of the height and the involute shape due to the warpage of the head plate 1 and the uneven flow of the blades 3 deteriorate.

When a molded article is molded, the fibrous filler is oriented, and the orientation causes anisotropy in the linear expansion coefficient. If the coefficient of linear expansion has anisotropy, the dimensional change becomes large due to environmental changes during use as a product, particularly anisotropic dimensional changes during expansion due to temperature changes.
In order to improve these phenomena, it is important to eliminate the anisotropy of the contraction rate and the linear expansion coefficient during molding. In the present invention, the fixed scroll 4 and the movable scroll 5 are made of synthetic resin. The appearance of the anisotropy could be prevented by molding with a material mixed with an isotropic filler, which has been demonstrated above and below.

As is apparent from Table 2 above, compared to the material filled with glass fiber as a fibrous filler, the material mixed with a spherical isotropic filler such as glass beads or silica is It is a molded product excellent in all items of dimensional accuracy. Further, for the scroll type pump incorporating each of the molded products (the fixed scroll 4 also incorporates a molded product made of the same molding material correspondingly), the maximum pressure, power consumption at that time, and 40 ° C atmosphere The results of measurement and evaluation are shown in the following [Table 3] with the maximum pressure and the wear state after continuous operation for 24 hours as good (摩 耗) and bad (x) in wear resistance.

[0065]

[Table 3] As apparent from [Table 3], the dimensional accuracy of the material in which the spherical isotropic filler such as glass beads or silica was blended was higher than the material in which the glass fiber as the fibrous filler was blended. Because of its superiority, the gap between the molded products is reduced and the maximum pressure is increased. Further, since there is no anisotropy at the time of thermal expansion, there is no deterioration in characteristics in a high-temperature atmosphere. Further, in this case, in the case of the material in which the glass fiber is filled and blended, the dimensional accuracy is not good, and thus the material itself is already lower than the maximum pressure itself of the initial characteristics. Looking at the abrasion resistance, in the case of the material filled with glass fiber, the precision of the molded product is not good. Almost no wear occurs with the compounded material.

Therefore, in the scroll type pump of this embodiment, as described above, when the fixed scroll 4 and the movable scroll 5 are formed of a material in which a synthetic resin is mixed with an isotropic filler, In addition, since the movable scroll 5 is formed using a synthetic resin as a base material, the movable scroll 5 is lightweight, does not require machining such as cutting metal, and improves productivity and reduces costs. Moreover,
Since the molding material is a mixture of a synthetic resin and an isotropic filler, the fixed scroll 4 and the movable scroll 5 have excellent dimensional accuracy, dimensional stability, and friction and wear resistance.
Good pump performance is ensured.

That is, since the isotropic filler is blended with the synthetic resin, the molding shrinkage has no anisotropy and the molding accuracy is excellent. Therefore, the maximum discharge pressure of the pump is improved, the one-side contact that occurs when the dimensional accuracy is poor is prevented, and the friction and wear resistance is excellent. In addition, the anisotropy of the linear expansion coefficient is eliminated, the dimensional change due to the temperature change is reduced, and the pump characteristics are stabilized and the reliability is obtained even when the environment changes.

In the scroll type pump according to the present invention, as described above, if the isotropic filler has a substantially spherical shape such as glass beads or silica, the scroll type pump according to claim 2 of the present invention. Becomes In this case, the anisotropy of the molding shrinkage and the linear expansion coefficient is further reduced, the molding accuracy is further increased, and the thermal expansion deformation due to a change in the use environment can be further prevented.

That is, as shown in the following [Table 4], isotropic fillers include tetrapod-like, spherical, and irregular-shaped fillers. Spherical glass and silica have various properties compared to those of other shapes. It is clear that it is excellent. In this case, fillers having different shapes are mixed with polyphenylene sulfide as a synthetic resin serving as a base, and the anisotropy of the molding shrinkage and linear expansion coefficient and the flatness of the flat portion 2 of the end plate 1 in each case. Was measured in the same manner as in the above [Table 1] and [Table 2].

[0070]

[Table 4] Further, in the scroll pump according to the present embodiment, if the synthetic resin serving as the base of the molding material is polyphenylene sulfide as described above, the scroll pump according to claim 3 of the present invention is obtained. In this case, since the polyphenylene sulfide has a low water absorption and a small linear expansion coefficient,
A dimensional change due to a change in use environment such as temperature and humidity due to a season is further reduced, a change in a gap amount between molded products is prevented, and a change in pump characteristics is reduced. The following [Table 5]
In addition to examples of synthetic resins that can be used as base materials, differences in molding shrinkage, water absorption, and linear expansion coefficient for each material are shown.

[0071]

[Table 5] As is clear from Table 5, among the synthetic resins, polyphenylene sulfide (PPS) has the smallest water absorption and the coefficient of linear expansion. By using the polyphenylene sulfide as a base material, environmental change ( Dimensional change due to temperature and humidity) is small. [Table 5]
In, the water absorption was calculated from the dimensions measured after immersion in water at 20 ° C. for 24 hours, and the molding shrinkage and linear expansion coefficient were measured in the same manner as in the above [Table 1]. is there.

Table 6 below shows the relationship between the filling amount of the isotropic filler, the shrinkage ratio, and the flatness of the end plate 1. In this case, polyphenylene sulfide (PPS), which is a synthetic resin as a base material, was mixed with spherical silica as an isotropic filler while changing the filling amount, and the molding shrinkage and flatness of the end plate 1 were measured for each. Things. As is apparent from Table 6, the flatness of the end plate 1 becomes worse with a decrease in the filling amount, in other words, as the shrinkage ratio increases. However, it is also known that the amount of the filler is limited, and that a large amount of the filler reduces the fluidity during molding and makes the molded article brittle. Therefore, in a material in which isotropic filler is blended with polyphenylene sulfide, it is preferable that the filling amount of the isotropic filler is 50 wt% to 70 wt%.

[0073]

[Table 6] By the way, when the synthetic resin serving as the base of the molding material is a crystalline resin, the molding shrinkage of the base resin is large,
Even if the filler is increased, there is a limit to the decrease in the molding shrinkage.
That is, it is difficult to improve the dimensional accuracy of the molded product, and the shape of the product must be increased in order to improve the product characteristics. For example, when a synthetic resin having low water absorption and linear expansion coefficient is used as a base material, such as polyphenylene sulfide which is a crystalline resin, the filling amount of the filler is the same, and in order to further improve the molding accuracy, the base material is used. It is necessary to reduce the shrinkage of the resin.

This problem is solved by a scroll type pump according to a fourth aspect of the present invention, in which a molding material is obtained by mixing an amorphous resin with polyphenylene sulfide as a base resin. In this case, the filling amount of the filler is the same, the shrinkage is reduced, and a molded product with excellent dimensional accuracy can be obtained. Also, if it is desired to reduce the molding shrinkage and eliminate the dimensional change due to water absorption, a non-crystalline resin having a small water absorption is blended, and if it is desired to reduce the molding shrinkage and eliminate the dimensional change due to heat, An amorphous resin having a small coefficient of linear expansion is blended, and the kind and amount of the amorphous resin to be blended can be determined according to the required use of the product.

Here, a material in which polyphenylene sulfide (PPS), which is a crystalline resin, is used as a base resin and glass beads are blended with 50 wt% as an isotropic filler,
The material further comprises an amorphous resin polyether sulfone
(Table 7) below shows the linear expansion coefficient, molding shrinkage ratio, and end plate flatness of each of the materials in which (PES) was blended so as to be 25 wt%. In this case, the flatness of the end plate 1 could be improved by lowering the molding shrinkage while maintaining the linear expansion coefficient as an index of thermal expansion.

[0076]

[Table 7] Therefore, in this case, as compared with the case where polyphenylene sulfide which is a crystalline resin is used alone, by using a synthetic resin in which an amorphous resin is blended with the polyphenylene sulfide as a molding material, dimensional change due to water absorption and temperature change is obtained. Is further reduced. In addition, it is possible to lower the molding shrinkage rate, and the initial accuracy is further improved to be excellent, whereby the dimensional stability against environmental changes is further improved, and the distance between the scrolls 4 and 5 of the air pump is improved. Is smaller, and pressure leakage of air is further reduced.

When the scroll pump is used in a high temperature atmosphere, the dimensional change due to heat is most important.
When used in such an environment, the material constituting the scroll pump is required to have dimensional stability against temperature change, and it is necessary to improve the molding accuracy in order to improve the pump characteristics. In order to improve the molding accuracy, it is necessary to reduce the shrinkage. Therefore, even if an attempt is made to fill and mix a large amount of filler, the filling amount of the filler is limited. No decline can be expected.

In order to use polyphenylene sulfide as a base resin, and to further improve molding accuracy while maintaining the same dimensional change due to heat, it is necessary to reduce the molding shrinkage rate with the same amount of filler. As shown in the above [Table 5], among the amorphous resins, polyether sulfone (PES) has a small linear expansion coefficient, which is equivalent to polyphenylene sulfide (PPS). Further, as described above, even if the filling amount of the filler is the same, the molding shrinkage ratio can be reduced, and a scroll molded product having excellent dimensional accuracy can be obtained.

That is, in the above case, if the amorphous resin is polyether sulfone (PES), the scroll pump according to the fifth aspect of the present invention is provided. In this case, since the polyether sulfone to be blended has a small linear expansion coefficient equivalent to the crystalline resin polyphenylene sulfide among the amorphous resins, it is possible to further reduce the shrinkage rate, Dimensional accuracy such as warpage is improved,
In addition, since the coefficient of linear expansion is reduced, dimensional stability against temperature changes is also ensured.

When the scroll pump is used in a high humidity atmosphere, the dimensional change due to water absorption is the most important. When used in such an environment, the material constituting the scroll pump is required to have dimensional stability against changes in humidity, and it is necessary to improve molding accuracy in order to improve pump characteristics. In order to improve the molding accuracy, it is necessary to reduce the shrinkage. Therefore, even if an attempt is made to fill and mix a large amount of filler, the filling amount of the filler is limited. No decline can be expected.

In order to make the dimensional change due to water absorption substantially equal to the case of using the same polyphenylene sulfide alone and to further improve the molding accuracy, the filling amount of the filler is the same and the molding shrinkage ratio is set to be the same as polyphenylene sulfide as the base resin. Needs to be reduced. [Table 5]
As shown in the above, among the amorphous resins, polyphenylene ether (PPE) has a small water absorption, and by blending the polyphenylene ether with polyphenylene sulfide as a base resin, the filling amount of the filler is the same. Even with this, it is possible to reduce the molding shrinkage, and it is possible to obtain a scroll molded product having excellent dimensional accuracy.

That is, in the above case, if the amorphous resin is polyphenylene ether (PPE), the scroll type pump according to claim 6 of the present invention is obtained. In this case, since the polyphenylene ether to be compounded has a low water absorption rate among the amorphous resins, the shrinkage rate can be further reduced, and the dimensional accuracy such as warpage is further improved. By reducing the rate, dimensional stability against water absorption is also ensured.

If the dimensional accuracy of the scroll molded product is not good, the fixed scroll 4 and the movable scroll 5 are combined with each other, and when the orbit is turned, the one-sided contact occurs due to the sliding, and the increased sliding resistance increases power consumption and wear. Generate an increase. Therefore, as the constituent material of the fixed scroll 4 and the movable scroll 5, a material having excellent wear resistance and a small coefficient of friction is desired. That is, in the above case, if a wear-resistant and low-friction material is mixed with the synthetic resin serving as the base of the molding material, the scroll pump according to claim 6 of the present invention is obtained.

For example, a comparison was made between a material in which polyphenylene sulfide as a base resin was filled and mixed with spherical glass as an isotropic filler, and a material in which the material was further mixed with a wear-resistant and low-friction material (Example). The results of measurement and evaluation of the kinetic friction coefficient and the abrasion property are shown in Table 8 below.
In this case, the measurement evaluation was performed under the conditions of a speed of 50 cm / s and a pressure of 1.5 kgf / cm2, by sliding flat plates formed of each material, measuring the load resistance at that time, and converting the dynamic friction coefficient from this, The state of wear after 24 hours was observed and evaluated.

[0085]

[Table 8] As is evident from Table 8, the use of a material containing a low-friction wear-resistant material reduces the dynamic friction coefficient and improves the wear resistance. That is, in this case, since the wear-resistant and low-friction material is blended in the molding material, the scroll 4,
The coefficient of friction at the sliding contact surface between the five members is reduced, the power consumption for driving the pump is reduced, and the wear is reduced, so that the durability can be improved. In addition, as the wear-resistant low friction material, tetrafluoroethylene resin (PTFE),
In addition to molybdenum disulfide, polyethylene (PE), oil and the like may be used and blended.

FIG. 7 shows another embodiment corresponding to claim 8 of the present invention. In the scroll type pump according to this embodiment, a portion where the fixed scroll 4 and the movable scroll 5 come into contact with each other is resistant to contact. A wear low friction material layer 22 is formed. In this case, the coating is applied to the entire flat surface of the flat plate portion 2 of the end plate 1 of the movable scroll 5 and the outer surface of the blade 3 protruding from the flat surface, so that the wear-resistant low-friction material layer 22 is formed. As a coating material, a fluororesin coating, a diamond-like carbon coating, a titanium coating, or the like is used.

Therefore, in the scroll type pump of this embodiment, the fixed scroll 4 and the movable scroll 5
The friction-resistant low friction material layer 22 is formed in a portion where the two are in contact with each other, so that the friction coefficient at the same contact portion is reduced by the wear-resistant low friction material layer 22 and power consumption for driving the pump is reduced. As a result, wear can be reduced and durability can be improved. In addition, as described above, the scroll manufacturing process is slightly more complicated than the case where a material containing a wear-resistant low-friction material is used as a constituent material of the scroll. It has the advantage of being obtained without waste. Except for this, the configuration is the same as that of the embodiment shown in FIG. 1, and the same operation and effect as in the above-described embodiment are exerted.

FIG. 8 shows still another embodiment corresponding to the eighth aspect of the present invention. In the scroll type pump of this embodiment, the fixed scroll 4 and the movable scroll 5 are located at positions where they contact each other. When forming the wear-resistant low-friction material layer 22, another member having excellent wear-resistance and low-friction properties is fixed to only the peripheral edge of the flat plate portion 2 of the end plate 1 of the orbiting scroll 5. It is provided as a wear-resistant low-friction material layer 22. In this case, another member that becomes the wear-resistant low-friction material layer 22 is a metal member or a ceramic member.

Therefore, the scroll type pump according to the present embodiment is subjected to severe conditions such as when sliding under high speed and high load conditions or when the load of the movable scroll 5 is received and supported by a ball. In addition, when the sliding portion is a molding material, progress of wear and seizure do not occur, and it is possible to improve wear resistance and reduce friction. Except for this, the configuration is the same as that of the embodiment shown in FIG. 7, and the same operation and effect as in the above-described embodiment are exerted.

FIGS. 9 and 10 show claims 9 and 10 of the present invention.
In the scroll type pump according to this embodiment, at least the movable scroll 5 and the fixed scroll 4 have a blade 3 having a predetermined involute curve portion, and the movable scroll 5 and the fixed scroll 4
The top plate 2a has a minimum area that overlaps when the blade 3 moves with a predetermined turning radius. With such a configuration, the shape can be designed to be small, so that the dimensional accuracy increases. Also, the top plate 2a where the blades 3 are located
Is that the molded article is less likely to warp because of the reinforcing effect of the blades 3. Since there is no warp, the wings 3, 3
Air leakage is suppressed and pump characteristics are improved. In addition, 2
3 is a spring. Also, the outer diameter of the pump is reduced, and the size can be reduced.

Table 9 below shows the flatness of the top plate 2a when the thickness B of the top plate 2a is changed when the thickness A of the blade 3 of the movable scroll 5 is 1.3 mm and 2.0 mm. It was made. At this time, the height of the blade 3 is 6 mm,
a is 35 mm, the base material is polyphenylene sulfide resin, and glass beads 50 w as filler.
It was molded by injection molding with t% blended.

As a result, it can be seen that the flatness is minimized when the thickness ratio between the blade 3 and the top plate 2a is approximately 1: 1.

[0093]

[Table 9] Therefore, the flatness is reduced, so that the blade 3 and the top plate 2
Since the contraction rates of “a” become substantially equal, the warpage is reduced, and the scroll efficiency and noise are improved.

Further, the scroll type pump manufacturing method according to the present invention is not limited to the injection molding as described above, but may be manufactured by any one of injection compression molding, transfer molding and compression molding. It is a good thing.

When a conventional filler such as glass fiber is used, the fibers are oriented in the flow direction of the resin at the time of molding, so that the shrinkage in the flow direction is different from that in the direction perpendicular thereto, causing warpage. Was not obtained, but by using an isotropic filler as in the present invention,
Since the shrinkage in the resin flow direction and the direction perpendicular to the resin flow direction during the molding of the material are substantially equal, the influence of the orientation of the filler can be neglected, so that the injection compression molding, transfer molding, Even in compression molding, molding precision is excellent, productivity is improved, and products can be provided at low cost.

According to the twelfth aspect of the present invention, by setting the position of the gate as the involute origin, the pressure distribution in the top plate 2a when the material flows can be reduced, and the position distant from the center of the top plate 2a can be reduced. In this case, since the shrinkage ratios at the same radius are substantially equal, warpage hardly occurs.

For example, the case where the movable scroll 5 is injection-molded will be described below. The movable scroll 5 includes at least a blade 3 having an involute curve and a circular top plate 2a. In this case, in order to minimize the size of the movable scroll 5, the origin of the involute curve and the center of the top plate 2a are different. When a gate is provided at the center of the disk, the resin is filled radially from the center of the top plate 2a, but there are a plurality of blades 3 at the same distance from the center of the top plate 2a. Therefore, there is a portion where the resin flowing through the blades 3 and the resin flowing from the top plate 2a to the blades 3 join. A converging portion is also formed on the upper portion of the blade 3, and irregularities are formed on the converging portion of the resin, so that the dimensional accuracy of the upper portion of the blade 3 cannot be obtained. When the gate is caused to flow from the side surface of the top plate 2a, the pressure distribution in the orbiting scroll 5 is further increased, and warpage occurs due to a difference in the shrinkage rate between the flow start point and the end point. As in the present invention, the resin is filled radially from the center of the top plate 2a by setting the position of the gate as the involute origin, but there is only one blade 3 at the same distance from the center of the top plate 2a. Will be. For this reason, the resin flows to the blade 3 in order from the origin of the involute, and the merging portion is eliminated, so that the dimensional accuracy at the upper portion of the blade 3 is improved.

FIGS. 11 and 12 show still another embodiment corresponding to the thirteenth and fourteenth aspects of the present invention. In the scroll type pump of this embodiment, at least the movable scroll 5 and the fixed scroll 4 are of a predetermined type. A blade 3 having an involute curve portion, a top plate 2a having a minimum area where the blades 3 of the movable scroll 5 and the fixed scroll 4 move at a predetermined turning radius,
The sliding part which receives a thrust force is provided in the outer peripheral part of a. As shown in FIG. 11, the fixed scroll 4, the movable scroll 5, the sliding member 24 disposed on the front and back surfaces of the outer periphery of the movable scroll 5, and the movable scroll 5
A spring member 23 for applying a back pressure for pressing the spring member 23 and a housing 7 for holding the spring member 23 are arranged. When there is no sliding member 24, the sliding is performed on the top plate 2 of the fixed scroll 4.
a, the upper surface of the blade 3 of the movable scroll 5, the top plate 2a of the movable scroll 5, and the upper surface of the blade 3 of the fixed scroll 4. Since the thickness of the blade 3 is thin and has edges, the wear progresses faster than the top plate 2a. In this case, the height of the blade 3 is reduced, and the volume of the air chamber is reduced. For this reason, the pressure and the flow rate, which are the pump characteristics, decrease due to a decrease in the intake air or a decrease in the compression ratio.

As in the present invention, a sliding portion is provided on the outer peripheral portion of the orbiting scroll 5, and a structure in which the wear-resistant material slides on the sliding portion allows the sliding portion to receive a thrust force. And the abrasion of the upper surface of the blade 3 is less likely to progress, so that the pump characteristics are less likely to be reduced, and the life is extended.

FIG. 12 is a diagram for comparing the shape of the warp deformation of the top plate 2a, wherein A is an embodiment, and B, C, and D are comparative examples. Example A has a blade height of 6 mm, a blade thickness of 1.3 mm, and an effective top plate diameter of φ35 m used as a pump.
m, a movable scroll molded product A having a sliding portion outer diameter of 43 mm and a top plate thickness of 1.3 mm, and an inner diameter of 30 mm and an outer diameter of 43 mm on a side of the movable scroll molded product A opposite to the outer peripheral blade of the top plate.
Molded product B whose thickness is 2 mm, molded product C whose half of the sliding portion of molded product B has a thickness of 2 mm, and the sliding portion thickness of the outer peripheral portion of the top plate are Table 10 shows the measurement results of the flatness of the molded product D having a thickness of 1 mm.

[0101]

[Table 10] Thus, by making the sliding portion of the outer peripheral portion of the top plate 2a thicker than the top plate 2a and imparting rigidity to the outer peripheral portion of the top plate 2a, warpage deformation of the outer peripheral portion is provided. It can be seen that can be reduced. That is, the top plate 2a
The flatness can be improved by increasing the thickness of the entire sliding portion of the outer peripheral portion.

As in claim 15 of the present invention, claim 14
In the above, the outer peripheral portion of the top plate 2a is post-processed to impart smoothness to the outer peripheral portion, so that the smoothness of the sliding portion can be obtained. It is suppressed and noise and abnormal wear are eliminated. This is done after forming only the outer periphery of the top plate 2a,
Since the molded product produced by molding has a limit in reducing the flatness, when sliding, when sliding, the unevenness of the molded product and the sliding material come into contact with each other. The pressure increases and wear progresses. In this case, in the case where the back pressure is applied to the fixed scroll 4 from the back of the orbiting scroll 5 by a spring or the like, the spring force is reduced, which may cause fluctuations in characteristics or may have irregularities. This causes vibration and noise.

Therefore, this problem can be solved by obtaining flatness. As a method of the post-processing, a method of heating and compressing only the outer peripheral portion of the molded product, a method of performing milling, or the like can be employed.

If the wear-resistant material is slid on the sliding portion on the outer peripheral portion of the top plate 2a as in claim 16 of the present invention, the outer peripheral portion of the movable scroll 5 is slid. As a result, the wear of the blades is reduced, and it is possible to suppress changes over time in the characteristics. The blades 3 of the movable scroll 5, the top plate 2a of the fixed scroll 4, and the top plate 2a of the movable scroll 5
Since the blades 3 of the fixed scroll 4 slide with each other, abrasion occurs at the sliding portions. In particular, when the top plate 2a and the blade 3 slide, the tip of the blade 3 is further worn. As the wear progresses in this manner, the volume of the air chamber formed between the blades 3 and 3 decreases, so that the gas compression ratio changes.
By providing a sliding portion on the outer peripheral portion of the orbiting scroll 5 and sliding a wear-resistant material as the sliding material 24 thereon,
The wear of the blades 3 is reduced, and the characteristics of the blades 3 can be prevented from changing with time.

As the above-mentioned sliding member 24, a material in which carbon fibers are mixed with a PPS resin as described in claim 17 of the present invention is appropriate. Ultra high molecular weight polyethylene also has good wear resistance.

Hereinafter, the materials shown in Table 11 below and comparing the wear performance of the sliding members will be described.

A ring-shaped sliding member 24 is arranged on the outer peripheral portion of the end plate of the fixed scroll 4, and the pressure applied to the sliding member 24 and the synthetic resin constituting the movable scroll 5 is set to 0. Use a coil spring that becomes 05MPa,
The wear amount of the movable member 5 was compared with that of the sliding member when the motor was rotated so that the linear velocity became 1.1 m / s and the sliding member was slid continuously for 200 hours.

At this time, as a constituent material of the movable scroll 5, a material in which glass beads were mixed with polyphenylene sulfide at 50 wt% as in Examples 1 to 4 was used.
The sliding material 24 is made of ultra-high molecular weight polyethylene, polyphenylene sulfide (pitch-based carbon fiber 30w).
t%, 40 wt%, 50 wt% filling). Further, as Comparative Examples 1 to 4, polyphenylene sulfide (filled with glass beads at 50 wt%), polyacetal, high molecular weight polyethylene, and 6 nylon were compared.

[0109]

[Table 11] As a result, a material obtained by blending carbon fiber with polyphenylene sulfide or ultra-high molecular weight polyethylene reduces the spring deflection due to wear of the sliding material 24 and the mating material. The wear amount of the member was as good as 2 to 4 μm. Therefore, the deflection of the spring is reduced due to wear of the sliding member and the mating material, and the movable scroll 5 by the spring is moved to the fixed scroll 4.
Thus, a decrease in pump characteristics due to a decrease in the pressing force on the pump can be suppressed, and the life can be prolonged. or,
The adverse effects due to wear powder can also be reduced.

At this time, as in claim 18 of the present invention,
If the orientation direction of the carbon fibers of the material in which the carbon fibers are blended with the PPS resin is arranged so as to be parallel to the sliding direction, the wear is reduced and the life is prolonged. This state is shown in FIG.
3 (a) and 3 (b) will be described.

As shown in FIG. 13A, the carbon fibers 26 are oriented in the vertical direction in the sliding member 24, and are slid in the left-right direction with the mating member 27. In this case, the mating member 27 is easily worn by the edge of the carbon fiber 26, and the fiber orientation of the carbon fiber 26 is slid as shown in FIG. By arranging it in parallel to the moving direction, it is possible to obtain a favorable result that wear is reduced and life is prolonged.

[0112]

As described above, in the scroll type pump according to the first aspect of the present invention, the fixed scroll and the movable scroll are light in weight, no machining is required, the productivity is improved and the cost is reduced. In addition, the fixed scroll and the movable scroll formed of a material in which an isotropic filler is blended with a synthetic resin have excellent dimensional accuracy, dimensional stability, and friction and wear resistance, and pump performance is secured.

In the scroll pump according to the second aspect of the present invention, in particular, the anisotropy of the molding shrinkage and the linear expansion coefficient is further reduced, the molding accuracy is further increased, and the heat due to a change in the use environment is increased. Further prevention of expansion deformation is also achieved.

Further, in the scroll type pump according to the third aspect of the present invention, in particular, the synthetic resin serving as the base of the molding material is polyphenylene sulfide, and the polyphenylene sulfide has a low water absorption and a small linear expansion coefficient.
Dimensional changes due to changes in the use environment such as temperature and humidity are further reduced.

Further, in the scroll pump according to the fourth aspect of the present invention, in particular, by mixing the amorphous resin with the polyphenylene sulfide, the dimensional change due to water absorption and temperature change can be further reduced. It is also possible to lower the molding shrinkage, further increasing the initial accuracy, thereby improving the dimensional stability against environmental changes and reducing the pressure leakage.

In the scroll pump according to the fifth aspect of the present invention, in particular, polyether sulfone having a small linear expansion coefficient is blended as an amorphous resin, so that the shrinkage rate can be further reduced. As a result, the dimensional accuracy of warpage and the like is further improved, and the linear expansion coefficient is reduced, so that dimensional stability against temperature changes is also ensured.

Further, in the scroll pump according to the sixth aspect of the present invention, in particular, polyphenylene ether having a low water absorption is blended as an amorphous resin, so that the shrinkage can be further reduced. The dimensional accuracy of warpage and the like is further improved, and the dimensional stability against water absorption is also ensured by reducing the water absorption.

Further, in the scroll pump according to claim 7 of the present invention, the friction coefficient at the sliding contact surface between the scrolls is reduced particularly by incorporating a wear-resistant low-friction material into the molding material. Since power consumption for driving the pump is reduced and wear is reduced, durability can be improved.

Further, in the scroll pump according to the present invention, the friction coefficient is reduced particularly at the portion where the fixed scroll and the movable scroll come into contact with each other due to the wear-resistant low-friction material layer, and the pump is driven. Power consumption and wear are reduced, so that durability can be improved.

In the scroll type pump according to the ninth aspect of the present invention, in particular, the reinforcing effect of the blades allows
The molded product is less likely to warp, the outer diameter of the pump is smaller,
The size can be reduced.

In the scroll type pump according to the tenth aspect of the present invention, in particular, since the shrinkage ratios of the blades and the top plate become substantially equal, warpage is reduced, and scroll efficiency and noise are improved.

In the method of manufacturing a scroll pump according to the eleventh aspect of the present invention, in particular, by using an isotropic filler, the shrinkage ratios become substantially equal, so that the influence of the orientation of the filler is reduced. Since it can be neglected, productivity is improved and products can be provided at low cost.

In the method of manufacturing a scroll pump according to the twelfth aspect of the present invention, the pressure distribution in the top plate can be reduced particularly when the material flows, and even in a portion distant from the center of the top plate. Since the shrinkage ratios at the same radius are substantially equal, warpage hardly occurs.

In the scroll type pump according to the thirteenth aspect of the present invention, in particular, by sliding the abrasion-resistant material against the sliding portion, the wear of the blades and the top plate is suppressed, and the life is extended. .

Further, in the scroll type pump according to the present invention, warping deformation of the outer peripheral portion can be reduced by providing rigidity of the outer peripheral portion of the top plate. In the method of manufacturing a scroll pump according to the fifteenth aspect of the present invention, in particular, since the smoothness of the sliding portion is obtained, an increase in the amount of abrasion due to one side contact and fluttering of the movable scroll are suppressed, and noise and noise are reduced. Eliminates abnormal wear.

Further, in the scroll type pump according to the present invention, a sliding portion is provided on the outer peripheral portion of the movable scroll, and the wear-resistant material is slid on the sliding portion. This makes it possible to suppress changes over time in characteristics.

In the scroll pump according to the seventeenth aspect of the present invention, in particular, when a material in which carbon fibers are blended with PPS resin is used, wear is reduced, service life is prolonged, and productivity is improved. Lower cost.

In the scroll type pump according to the eighteenth aspect of the present invention, when the carbon fibers are arranged so that the orientation direction of the carbon fibers is parallel to the sliding direction, the wear is reduced and the life is prolonged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll type pump according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an Oldham ring in the scroll pump.

FIG. 3 is a perspective view showing an eccentric cam in the scroll pump, and a cross-sectional view showing an application form of the eccentric cam.

FIG. 4 is a longitudinal sectional view showing a main part of the scroll type pump when the eccentric cam according to the applied embodiment is used.

FIG. 5 is an exploded perspective view showing a movable scroll and its pressing mechanism in the scroll pump.

FIG. 6 is a longitudinal sectional view showing a main part of a scroll pump illustrated as a comparative example for explaining the effect of the scroll pump.

FIG. 7 is a longitudinal sectional view showing a main part of a scroll pump according to another embodiment corresponding to the invention described in claim 8;

FIG. 8 is a longitudinal sectional view showing a main part of a scroll pump according to still another embodiment corresponding to the invention described in claim 8;

FIG. 9 is a longitudinal sectional view showing a main part of a scroll pump according to still another embodiment corresponding to the invention described in claim 9;

FIG. 10 is a longitudinal sectional view showing a thickness ratio of a movable scroll.

FIG. 11 is a longitudinal sectional view showing a main part of a scroll pump according to still another embodiment corresponding to the invention described in claim 13;

FIG. 12 is a longitudinal sectional view showing a thickness ratio of a top plate of a movable scroll, where (A) shows an example and (B) to (D) show comparative examples.

13A is a schematic longitudinal sectional view showing a state in which carbon fiber orientations are arranged in a vertical direction, and FIG. 13B is a state in which carbon fiber orientations are arranged in a parallel direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 End plate 2 Flat plate part 2a Top plate 3 Blade 4 Fixed scroll 5 Movable scroll 6 Oldham ring 7 Housing 8 Eccentric cam 9 Motor 22 Wear-resistant low friction material layer 24 Sliding material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kimiaki Nakata 1048 Kazumasa Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. 72) Inventor Tsukasa Hogami 1048 Kadoma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 3H039 AA01 AA12 BB07 CC02 CC03 CC06 CC08 CC35

Claims (18)

[Claims] 1. A fixed scroll having spiral blades formed on a plane of a flat plate of a head plate, and a movable scroll having blades of the same shape as the blades and having opposite winding directions formed on a flat plate of another head plate. In a scroll type pump that compresses fluid sucked into a sealed space formed between both scrolls by swinging the movable scroll with respect to the fixed scroll by combining the blades with the blades facing each other, the fixed scroll And a scroll type pump, wherein the movable scroll is formed of a material obtained by mixing an isotropic filler with a synthetic resin. 2. The scroll pump according to claim 1, wherein the isotropic filler has a substantially spherical shape. 3. The scroll pump according to claim 1, wherein the synthetic resin serving as a base of the molding material is polyphenylene sulfide. 4. The scroll pump according to claim 3, wherein the molding material is a mixture of an amorphous resin. 5. The scroll pump according to claim 4, wherein the amorphous resin is polyether sulfone. 6. The scroll type pump according to claim 4, wherein the amorphous resin is polyphenylene ether. 7. The scroll pump according to claim 1, wherein the molding material contains a wear-resistant low-friction material. 8. The scroll type pump according to claim 1, wherein a wear-resistant low-friction material layer is formed at a position where the fixed scroll and the movable scroll come into contact with each other. 9. The minimum area in which at least the movable scroll and the fixed scroll have a predetermined involute curve portion, and the blades of the movable scroll and the fixed scroll overlap at a predetermined turning radius. A scroll type pump comprising a top plate having: 10. The ratio of the blade thickness to the top plate thickness is approximately 1: 1.
The scroll type pump according to claim 9, wherein 1 is set. 11. The method for manufacturing a scroll type pump according to claim 10, wherein said movable scroll and said fixed scroll are manufactured by any one of injection molding, injection compression molding, transfer molding and compression molding. 12. The method of manufacturing a scroll type pump according to claim 11, wherein the position of the gate is set as an involute origin in the method of manufacturing the movable scroll and the fixed scroll. 13. The minimum area in which at least the movable scroll and the fixed scroll have a predetermined involute curve portion and the movable scroll and the fixed scroll have overlapping blades when moving with a predetermined turning radius. And a sliding portion for receiving a thrust force on an outer peripheral portion of the top plate. 14. The scroll type pump according to claim 13, wherein the thickness of the sliding portion on the outer peripheral portion of the top plate is made larger than that of the top plate. 15. The smoothness of the outer peripheral portion is provided by post-processing the outer peripheral portion of the top plate.
4. A method of manufacturing the scroll pump according to 4. 16. The scroll pump according to claim 13, wherein a wear-resistant material slides on a sliding portion of the outer peripheral portion of the top plate. 17. A member that slides on the outer peripheral portion of the top plate is a PP.
The scroll type pump according to any one of claims 13 to 16, wherein the scroll type pump is a material obtained by mixing carbon fibers with S resin. 18. The method according to claim 13, wherein the carbon fiber of the material obtained by blending the carbon fiber with the PPS resin is arranged so that the orientation direction of the carbon fiber is parallel to the sliding direction.
7. The scroll type pump according to any one of items 7 to 7.