JP2007255283A - Scroll fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maximally prevent the heat generated in a pivot part by a driving shaft of a fixed scroll or a turning scroll and frictional heat by contact with a mating side end plate of a chip seal on the tip of both fixed and turning scrolls from being transmitted to a dust seal via respective laps and a scroll body. <P>SOLUTION: A dust seal groove 4 for fitting the dust seal formed in an outer peripheral part of the end plate in the body of the fixed scroll 20 and/or the turning scroll, is formed by fitting a cross-sectional forward U-shaped annular groove body 5 composed of a material having heat conductivity lower than a material of forming the scroll body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scroll fluid machine including a scroll compressor and a scroll vacuum pump.

  Hereinafter, in this specification, front and rear refer to the inlet side and the bottom side of the dust seal groove, respectively, and inner and outer refer to the radial direction.

  Scroll fluid machines, including scroll compressors and scroll vacuum pumps, are well known to those skilled in the art, and usually have an orbiting wrap on an orbiting end plate pivotally supported via a bearing on an eccentric shaft part integral with a drive shaft. A sealed chamber is formed between the orbiting wrap and the fixed wrap by meshing the orbiting wrap in the orbiting scroll and the fixed lap on the fixed scroll that is erected on the fixed end plate. In addition, a rotation prevention mechanism for preventing the rotation motion of the orbiting scroll is provided (Patent Documents 1, 2, etc.).

  With the eccentric shaft part of the drive shaft and the rotation prevention mechanism, the orbiting scroll is eccentrically rotated, and the volume of the sealed chamber is gradually decreased in the centripetal direction or conversely increased in the centrifugal direction depending on the rotation direction. By doing so, the gas sucked from the outer peripheral portion is guided to the central portion while being compressed, or the gas sucked from the central portion is decompressed and discharged from the outer peripheral portion.

  The swivel wrap and the fixed wrap are an involute curve around the center where the diameter gradually increases in the rotation direction, a curve obtained by connecting a very short arc having a common center in the circumferential direction, or a combination of these curves. The gap between the orbiting wrap and the fixed wrap in the orbiting radius direction is precisely determined so that the two wraps do not come into contact with each other and are not excessive.

  A fitting groove is formed on the front end surfaces of the swirl wrap and the fixed wrap, and a tip seal that slides in an airtight manner on the end plate of the opposing scroll is fitted in the fitting groove.

  In addition, dust seal grooves that surround the fixed wrap and the orbiting wrap are formed in the outer peripheral portion of the opposing surface of either the fixed end plate in the fixed scroll or the orbiting end plate in the orbiting scroll, respectively. A dust seal is fitted.

During operation, the dust seal is depressurized when the desired vacuum level is not achieved or the operation is stopped when the atmosphere leaks from the outer periphery of the fixed scroll and the orbiting scroll to the decompression chamber side on the centripetal side. The pressure in the sealed container connected to the suction side of the vacuum pump or the like is prevented from increasing from the chamber, or the gas is prevented from leaking from the centripetal side to the outer peripheral side.
JP-A-6-207588 Japanese Patent No. 3248618

  The dust seal groove into which the dust seal is fitted is usually formed simultaneously on the main body of a fixed scroll or orbiting scroll made of aluminum or other light alloy at the time of casting, or is engraved by machining after the main body is cast. Has been.

  Therefore, the heat generated by the drive shaft pivot support portion in the main body during operation and the frictional heat due to contact with the mating end plate of the tip seal fitted in the fitting groove on the tip surface of the fixed wrap and the swivel wrap, Along the main body of the scroll, it reached the dust seal in the dust seal groove, which deteriorated or deteriorated the dust seal to accelerate its wear and impair its durability.

  In addition, a nest may be inevitably generated in each part of the cast fixed scroll or the orbiting scroll, and this nest is sealed by a dust seal when the dust seal groove is formed by machining. If it is exposed to the side, the seal becomes defective, and the performance of the scroll fluid machine is impaired.

  In the present invention, the heat generated in the pivotal support portion by the drive shaft of the fixed scroll or the orbiting scroll, and the frictional heat due to the contact of the tip seal of the fixed and orbiting scroll with the other end plate of the tip seal pass through each lap and the scroll body. , To prevent transmission to the dust seal as much as possible, and even if there is a nest in the fixed / revolving scroll, this nest will not be exposed in the dust seal groove, thereby improving the durability of the dust seal and thus long-term It is an object of the present invention to obtain a scroll fluid machine that can exhibit stable performance over a long period of time.

According to the present invention, the above problem is solved as follows.
(1) A dust seal groove for fitting a dust seal formed on the outer peripheral portion of the end plate in the main body of the fixed scroll and / or the orbiting scroll has a heat conduction as compared with the material forming the scroll main body. It is formed by fitting an annular groove body having a forward U-shaped cross section made of a material having low properties.

(2) In the above item (1), the annular groove is cast at the same time as the scroll body is cast.

(3) In the above item (1), the annular groove body is fitted and fixed to a holding groove provided in a cast scroll body.

(4) In the above (3), the annular groove body is mechanically press-fitted into the holding groove provided in the scroll body.

(5) In the above item (3), the annular groove body is fitted and fixed to the holding groove provided in the scroll body using the difference in expansion and contraction due to the temperature difference.

(6) In any one of the above (1) to (5), unevenness arranged in the front-rear direction is provided on the outer peripheral surface of the side wall of the annular groove.

(7) In any one of the above (1) to (5), unevenness arranged in the circumferential direction is provided on the outer peripheral surface of the side wall of the annular groove.

(8) In any one of the above (1) to (7), a recessed portion is provided on the outer peripheral surface of the side wall of the annular groove.

(9) In the above item (8), the recessed portion is composed of a large number of bottomed holes.

(10) In the above item (8), the recessed portion is a through hole facing inward and outward.

(11) In the above item (1) or (2), the outer peripheral surface of the side wall of the annular groove is inclined so as to gradually increase in the depth direction of the annular groove.

(12) In the above item (1) or (2), the annular strip is provided with a protrusion facing in the radial direction.

(13) The side surface on the low pressure side of the dust seal groove engraved on the outer peripheral portion of the end plate of the fixed scroll and / or the orbiting scroll is made of a metal material having a lower thermal conductivity than the end plate of the scroll. An annular pressure receiving portion for a dust seal is formed.

(14) In the above item (13), the annular pressure receiving portion is made of a metal annular strip having a lower thermal conductivity than the scroll end plate.

(15) In the above item (14), the belt-like piece is mechanically press-fitted into the dust seal groove provided in the outer peripheral portion of the fixed scroll and / or the orbiting scroll so as to be in close contact with the low-pressure side surface. .

(16) In the above item (14), the strip is brought into close contact with the low pressure side surface of the dust seal groove on the outer periphery of the fixed scroll and / or the orbiting scroll using the difference in expansion / contraction amount due to the temperature difference. .

(17) In the above item (13), the annular pressure receiving portion is formed by plating the low pressure side surface of the dust seal groove with a metal material having a lower thermal conductivity than the end plate of the scroll.

(18) In the above item (13), the annular pressure receiving portion is formed by spraying a metal material having a lower thermal conductivity than the scroll end plate on the low pressure side surface of the dust seal groove.

(19) In the above item (13), an annular pressure receiving portion is formed by casting an annular strip made of a metal material having a lower thermal conductivity than the end plate of the scroll on the low pressure side surface of the dust seal groove. It is.

(20) In the above (13), a large number of irregularities in the depth direction of the dust seal groove are provided on the outer peripheral surface of the annular pressure receiving portion.

(21) In any one of the above items (13) to (20), the outer surface of the annular pressure receiving portion is an inclined surface that becomes thicker as it goes in the depth direction of the dust seal groove.

(22) In any one of the above items (13) to (21), outward projections are provided at appropriate positions of the annular pressure receiving portion.

(23) In any one of the above items (13) to (22), an inward protrusion that overlaps with the depth of the dust seal groove is provided in the depth of the annular pressure receiving portion.

Invention of Claim 1:
During operation, heat generated in the shaft support part of the fixed and orbiting scroll and frictional heat accompanying the tip seal at the tip of each lap sliding on the other end plate are conducted in the centrifugal direction of the scroll body, The heat is prevented from being conducted by the annular groove body made of a material having a low thermal conductivity as compared with the scroll body, and there is little possibility that the heat is transmitted to the dust seal fitted thereto. Accordingly, the dust seal is less likely to be deteriorated or changed due to the influence of heat generated by the operation, and the useful life thereof is shortened.

  In addition, even if there is a nest in the holding groove portion of the scroll body, this nest is covered with the annular groove, so there is no inconvenience.

Invention according to claim 2:
Simultaneously with the casting of the scroll body, the annular groove is cast in a predetermined place, so that the operation is simple.

Invention according to claim 3:
Since the annular groove body only needs to be fitted and fixed in the holding groove formed in advance in the scroll body, the operation is simple, and the annular groove body can be replaced if necessary.

Invention according to claim 4:
Since the annular groove body is pressed by a press or the like and press-fitted into the holding groove of the scroll body, the operation is simple.

Invention according to claim 5:
Even without special equipment, it is possible to easily fix the annular groove body into the holding groove of the scroll body by using shrink fitting or cold fitting technology. , Can be removed or replaced.

Invention according to claim 6:
The annular groove body is securely retained in the holding groove, so that the annular groove body does not move unreasonably even when receiving heat.

Invention according to claim 7:-
The annular groove body is held in the holding groove so as not to rotate in the circumferential direction.

Invention of Claim 8:-
Since the material of the scroll main body bites into the recessed portion of the outer peripheral surface of the annular groove body, the annular groove body does not move unreasonably.

Invention of Claim 9:-
A desired number of bottomed holes for allowing the material of the scroll main body to bite into the outer peripheral surface of the already completed annular groove body can be easily provided by a drill or the like.

Invention of Claim 10:-
The through hole in the inner and outer direction, that is, the radial direction can be easily drilled with a drill or the like, and the material of the scroll body bites into the openings on both the inner and outer sides of the through hole, and the annular groove body is inserted into the holding groove. Holds firmly and securely.

Invention of Claim 11:
The annular groove once cast in the scroll body is securely held without coming off.

Invention of Claim 12:-
When the annular groove is cast into the scroll body, the projections facing in the radial direction exert a reliable retaining action.

Invention of Claim 13:-
Heat that is conducted from the center of the scroll body in the outer diameter direction is prevented from being transmitted to the dust seal fitted in the annular groove, and the annular pressure receiving portion is superposed only on one side of the dust seal groove. Therefore, the implementation is easy and the cost can be reduced.

Invention of Claim 14:
An annular pressure receiving portion can be easily formed by fitting a flat annular strip of metal into one side surface of a dust seal groove and polymerizing it.

Invention of Claim 15:-
It is possible to easily perform the superposition of the annular strip on the side surface of the dust seal groove.

Invention of Claim 16:-
By utilizing the dimensional change caused by heating or cooling, the annular strip can be easily polymerized and fixed, and can be removed or replaced as necessary.

Invention of Claim 17:
The annular pressure receiving portion can be easily formed, and the thickness thereof can be arbitrarily determined or changed.

Invention of Claim 18:
The annular pressure receiving portion can be made strong and the thickness thereof can be arbitrarily determined.

Invention of Claim 19:
The annular pressure receiving portion can be formed easily and efficiently.

Invention of Claim 20:
Since the material of the scroll body bites into the outer peripheral surface of the annular pressure receiving portion, the annular pressure receiving portion is firmly held.

Invention of Claim 21:
The annular pressure receiving portion is prevented from coming out in the axial direction.

Invention of Claim 22:-
The annular pressure receiving part is securely held.

Invention of Claim 23:
By making the inward projections smooth, the back part of the dust seal inserted in the dust seal groove is in good contact with the inward protrusions, and heat transfer from the scroll body to the back part of the dust seal is weakened.

  FIG. 1 is a schematic longitudinal side view of a fixed scroll (1) in a scroll fluid machine.

  The fixed scroll (20) has an involute fixed wrap (23) standing on the front surface of a fixed end plate (22) having a cooling fin (21) on the back, and a central shaft of the fixed end plate (22). The drive shaft is pivotally supported in the hole (24) via a bearing (not shown).

  A tip seal groove (25) is formed at the front end of the fixed wrap (23), and the tip seal (26) is fitted into the tip seal groove (25).

  An axial dust seal groove (27) is engraved in the area surrounding the fixed wrap (23) on the front surface of the outer periphery of the fixed end plate (22), and a dust seal (not shown) is provided in the dust seal groove (27). Mated.

  The present invention relates to a scroll fluid machine in which the structure of the dust seal groove (27) is novel.

  Accordingly, in FIG. 2 and subsequent figures, the dust seal groove (27) and its peripheral portion are shown in an enlarged manner, and the embodiments of the invention described in each claim will be described.

FIG. 2 shows an embodiment of the invention described in claims 1 to 5.
An annular holding groove (3) having a forward-facing cross-section with a front opening at an appropriate position in a region surrounding the fixed wrap (2) in the outer peripheral portion of the fixed end plate (1) of the fixed scroll made of aluminum or an alloy thereof. Is engraved.

  An annular groove body (5) in which a dust seal groove (4) is engraved from the front surface is fixedly fitted into the holding groove (3).

  The annular groove (5) is made of steel or stainless steel having a low thermal conductivity compared to the material of the fixed scroll main body, and is formed in advance to the required dimensions when the fixed scroll main body is cast. (1) is cast and fixed simultaneously (the invention according to claim 2).

  A holding groove (3) is formed on the fixed end plate (1) of the cast fixed scroll body from the front by cutting or the like, and an annular groove (5) is formed in the holding groove (3). May be fixed (invention of claim 3).

  At this time, the annular groove body (5) may be mechanically press-fitted into the holding groove (3) (invention of claim 4), or the holding groove (3) may be shrink-fitted or cold-fitted. ) May be fixed within (). (Invention of Claim 5)

  In FIG. 3 and subsequent figures, elements similar to those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 3, a plurality of concave and convex portions (6) arranged in the depth direction may be provided on the outer peripheral surface of the side wall of the annular groove (5) (the invention according to claim 6).

  As shown in FIG. 4, the concavo-convex portion (7) may be provided in the circumferential direction on the outer peripheral surface of the side wall of the annular groove (5) (invention according to claim 7).

  As shown in FIG. 5, an appropriate number of recessed portions (8) may be provided on the outer peripheral surface of the side wall of the annular groove (5) (the invention according to claim 8).

  In addition, the recessed part (8) in FIG. 5 has many bottomed holes (invention of Claim 9).

  In FIG. 6, the recessed portion is formed as a through hole (9) facing the radial direction of the fixed end plate (1). (Invention of Claim 10).

  In FIG. 7, the outer peripheral surface of the side wall of the annular groove (5) is inclined outward so as to gradually become thicker in the depth direction of the annular groove (5).

  In FIG. 8, an annular projection (10) projecting in the radial direction is provided on the side wall of the annular groove (5) (the invention according to claim 12).

  In FIG. 9, the heat conduction is smaller than the fixed end plate (1) on the low pressure side surface, that is, the centripetal side surface of the dust seal groove (4) formed in the fixed end plate (1) of the fixed scroll. An annular strip (11) made of a metal having low properties is fixed by polymerization, and this is used as an annular pressure receiving portion for dust sealing (inventions according to claims 13 and 14).

  The annular strip (11) may be mechanically press-fitted into a key point (the invention according to claim 15), or may be shrink-fitted or cold-fitted to cause the low-pressure side surface of the dust seal groove (4). (The invention according to claim 16). Moreover, it may be fixed by casting (the invention according to claim 19).

  As shown in FIG. 10, a metal material having a lower thermal conductivity than the fixed end plate (1) of the scroll is plated or sprayed on the side surface on the low pressure side of the dust seal groove (4). (12) may be formed (the inventions according to claims 17 and 18).

  As shown in FIG. 11, an appropriate number of irregularities in the depth direction of the dust seal groove (4) is formed on the outer peripheral surface of the annular strip (11) made of a metal material having a lower thermal conductivity than the end plate of the scroll. (13) may be provided (the invention according to claim 20).

  As shown in FIG. 12, the outer surface of the annular strip (11) may be an inclined surface (14) that becomes thicker toward the depth direction of the dust seal groove (4). ).

  As shown in FIG. 13, an outward projection (15) may be provided at an appropriate position of the annular strip (11) (the invention according to claim 22).

  As shown in FIG. 14, an inward projection (16) that forms the bottom wall of the dust seal groove (4) may be provided at the back of the annular strip (11) (the invention according to claim 23). .

It is a vertical side view which extracts and schematically shows the fixed scroll in a scroll fluid machine. It is an expanded vertical side view of the principal part which shows schematically the embodiment of the invention of Claims 1-5. It is an expansion vertical side view of the principal part which shows the embodiment of the invention of Claim 6 schematically. It is a front view of the cyclic | annular groove body which shows schematically the embodiment of invention of Claim 7. It is a principal part expansion vertical side view which shows schematically embodiment of the invention of Claim 8 or 9. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 10. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 11. It is a principal part expansion vertical side view which shows schematically the embodiment of the invention of Claim 12. It is a principal part expansion vertical side view which shows schematically embodiment of invention of any one of Claims 13-16, or 19. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 17 or 18. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 20. It is a principal part expansion vertical side view which shows schematically embodiment of invention of Claim 21. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 22. It is a principal part expansion vertical side view which shows roughly the embodiment of the invention of Claim 23.

Explanation of symbols

(1) Fixed end plate
(2) Fixed wrap
(3) Holding groove
(4) Dust seal groove
(5) Annular groove
(6) Concavity and convexity
(7) Concavity and convexity
(8) Recessed part
(9) Through hole
(10) Protrusion
(11) Annular strip
(12) Annular pressure receiving part
(13) Concavity and convexity
(14) Inclined surface
(15) Outward projection
(16) Inward projection
(20) Fixed scroll
(21) Cooling fin
(22) Fixed end plate
(23) Fixed wrap
(24) Shaft hole
(25) Tip seal groove
(26) Tip seal
(27) Dust seal groove

Claims (23)

  The dust seal groove for fitting the dust seal formed on the outer peripheral portion of the end plate in the main body of the fixed scroll and / or the orbiting scroll has a lower thermal conductivity than the material forming the scroll main body. A scroll fluid machine, characterized by being formed by fitting an annular groove body having a forward U-shaped cross section made of a material.   2. The scroll fluid machine according to claim 1, wherein the annular groove is cast at the same time as the scroll body is cast.   The scroll fluid machine according to claim 1, wherein the annular groove body is fitted and fixed to a holding groove provided in a cast scroll body.   4. A scroll fluid machine according to claim 3, wherein the annular groove body is mechanically press-fitted into a holding groove provided in the scroll body.   4. The scroll fluid machine according to claim 3, wherein the annular groove body is fitted and fixed to a holding groove provided in the scroll body by utilizing a difference in expansion and contraction due to a temperature difference.   The scroll fluid machine according to any one of claims 1 to 5, wherein unevenness arranged in the front-rear direction is provided on the outer peripheral surface of the side wall of the annular groove body.   The scroll fluid machine according to any one of claims 1 to 5, wherein irregularities arranged in a circumferential direction are provided on an outer peripheral surface of a side wall of the annular groove body.   The scroll fluid machine according to any one of claims 1 to 7, wherein a recessed portion is provided on an outer peripheral surface of a side wall of the annular groove body.   The scroll fluid machine according to claim 8, wherein the recessed portion is composed of a plurality of bottomed holes.   The scroll fluid machine according to claim 8, wherein the recessed portion is a through hole facing inward and outward.   The scroll fluid machine according to claim 1 or 2, wherein the outer peripheral surface of the side wall of the annular groove is inclined so as to be gradually thicker in the depth direction of the annular groove.   The scroll fluid machine according to claim 1 or 2, wherein the annular strip is provided with a projection directed in a radial direction thereof.   The side surface on the low pressure side of the dust seal groove engraved on the outer periphery of the end plate of the fixed scroll and / or the orbiting scroll has a dust seal made of a metal material having a lower thermal conductivity than the end plate of the scroll. A scroll fluid machine characterized in that it is formed in an annular pressure receiving portion for the purpose.   14. The scroll fluid machine according to claim 13, wherein the annular pressure receiving portion is made of a metal annular strip having a lower thermal conductivity than the scroll end plate.   The scroll fluid machine according to claim 14, wherein the belt-like piece is mechanically press-fitted into a dust seal groove provided in an outer peripheral portion of the fixed scroll and / or the orbiting scroll so as to be in close contact with the side surface on the low pressure side. .   The scroll fluid machine according to claim 14, wherein the strip-shaped piece is brought into close contact with the low pressure side surface of the dust seal groove in the outer peripheral portion of the fixed scroll and / or the orbiting scroll using the difference in expansion / contraction amount due to the temperature difference. .   The scroll fluid machine according to claim 13, wherein an annular pressure receiving portion is formed by plating a metal material having a lower thermal conductivity than the end plate of the scroll on the low pressure side surface of the dust seal groove.   14. The scroll fluid machine according to claim 13, wherein an annular pressure receiving portion is formed on the side surface on the low pressure side of the dust seal groove by spraying a metal material having lower thermal conductivity than the end plate of the scroll.   The scroll fluid according to claim 13, wherein an annular pressure receiving portion is formed by casting an annular strip made of a metal material having a lower thermal conductivity than the end plate of the scroll on the side surface on the low pressure side of the dust seal groove. machine.   The scroll fluid machine according to claim 13, wherein a large number of irregularities in the depth direction of the dust seal groove are provided on the outer peripheral surface of the annular pressure receiving portion.   The scroll fluid machine according to any one of claims 13 to 20, wherein an outer surface of the annular pressure receiving portion is an inclined surface that becomes thicker as it goes in the depth direction of the dust seal groove.   The scroll fluid machine according to any one of claims 13 to 21, wherein an outward projection is provided at an appropriate position of the annular pressure receiving portion. The scroll fluid machine according to any one of claims 13 to 22, wherein an inward protrusion that overlaps with a back part of the dust seal groove is provided in a back part of the annular pressure receiving part.

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