JP2006017013A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep radial clearance among lap parts nearly uniform, to prevent deterioration in performance of a device, and to improve reliability or a life. <P>SOLUTION: Thin thickness parts 21A, 21B, 21C, 21D, 21E, 21F are formed in the vicinity of the lap parts 2B crossing a Y-Y line on an inner peripheral surface in the vicinity of a portion crossing the Y-Y line perpendicular to an extension direction (X-X line) of a cooling fin 2C among the lap parts 2B of a fixed scroll 2 by performing cutting over a predetermined angle range. Other thin thickness parts 22A, 22B, 22C, 22D, 22E, 22F are formed on an outer peripheral surface in the vicinity of the portion crossing the X-X line among the lap parts 2B of the fixed scroll 2 by performing the cutting over the predetermined angle range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll fluid machine that is suitably used as a compressor such as air or refrigerant, or a vacuum pump.

  In general, a scroll type fluid machine is a suction port provided on the outer peripheral side of a fixed scroll by rotating a drive shaft with a rotation source such as an electric motor and rotating the orbiting scroll with a fixed eccentric dimension with respect to the fixed scroll. The fluid is sucked in from the air, and the fluid is sequentially compressed in each compression chamber between the fixed scroll wrap portion and the orbiting scroll wrap portion, and the compressed fluid is discharged from the discharge port provided in the center portion of the fixed scroll. (For example, see Patent Document 1).

JP 2000-45971 A

  In this type of conventional scroll type fluid machine, the radial gap formed between the wrap portions of the fixed scroll and the orbiting scroll is made as small as possible to suppress the leakage of the compressed fluid from each compression chamber. Therefore, the compression efficiency is increased.

  Further, the end plate of the fixed scroll and the orbiting scroll is provided with a plurality of cooling fins extending in parallel with each other in one direction on the back side thereof, and the end plate is made to flow through the cooling air along these cooling fins. Cooling from the back side prevents deformation of the lap portion due to the influence of compression heat or the like.

  By the way, in the above-described conventional scroll type fluid machine, for example, a plurality of cooling fins extending parallel to each other and extending in one direction are provided on the back surface side of the fixed scroll. The rigidity is high in one direction in which the cooling fin extends, and the rigidity is low in a direction perpendicular thereto.

  For this reason, for example, when the wrap portion of the fixed scroll is deformed due to the influence of the pressure of the fluid generated in the compression chamber, compression heat, etc., a larger deformation is likely to occur in the direction perpendicular to the extension direction (one direction) of the cooling fin, As a result, the radial gap formed between the wrap portions of the fixed scroll and the orbiting scroll becomes non-uniform, causing a problem that the performance as a scroll fluid machine is deteriorated.

  Further, when the lap portion is deformed as described above, not only the gap between the fixed scroll and the orbiting scroll wrap portion becomes non-uniform, but also the fixed scroll and the orbiting scroll lap portion may contact each other, and the reliability of the device may be increased. There is a problem that the performance and life are reduced.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to maintain the radial gap between the lap portions properly even under the influence of compression heat, etc. It is an object of the present invention to provide a scroll type fluid machine that can prevent the above-described problems and can improve reliability and life.

  In order to solve the above-described problem, the invention of claim 1 is directed to a first scroll member in which a spiral wrap portion is erected on the surface of the end plate, and the end plate disposed opposite to the first scroll member. In the scroll type fluid machine having a second scroll member on a surface of which a wrap portion is provided so as to overlap the wrap portion of the first scroll member and define a plurality of compression chambers. The wrap portion of at least one of the scroll members is partly provided by heat to the inner peripheral side or the outer peripheral side by the arrangement of the members integrally provided on the back side of the end plate of the one scroll member. The structure characterized by making the part which deform | transforms into a thin part into part is employ | adopted.

  According to a second aspect of the present invention, there is provided a first scroll member in which a spiral wrap portion is erected on the surface of the end plate, and the first scroll member disposed opposite to the first scroll member on the surface of the end plate. A second scroll member that is provided with a wrap portion that is overlapped with the wrap portion of the scroll member to define a plurality of compression chambers, and at least one of the first and second scroll members includes In the scroll fluid machine having a plurality of cooling fins extending in one direction on the back side of the end plate, the wrap portion of at least one of the first and second scroll members includes the wrap portion. In other words, a thin portion is formed on the inner peripheral surface in the vicinity of a line perpendicular to the direction in which the cooling fin extends.

  According to a third aspect of the present invention, the wrap portion of the one scroll member is formed with another thin portion on the outer peripheral surface in the vicinity of a portion substantially perpendicular to the extending direction of the cooling fin. .

  Furthermore, according to the invention of claim 4, the one scroll member is constituted by a fixed scroll provided integrally or separately on the casing.

  As described above, according to the first aspect of the present invention, at least one scroll member of the first and second scroll members is integrally provided on the back side of the end plate of the one scroll member. Since the portion where the lap portion is partially deformed by heat toward the inner peripheral side or the outer peripheral side by the arrangement of the thin-walled portion is used, for example, the pressure of the fluid generated in the compression chamber, the compression heat, etc. Even if the wrap portion is deformed, the first and second scroll members can appropriately maintain the radial gap between the wrap portions, and can prevent the performance as the scroll fluid machine from being deteriorated. .

  Therefore, even if the wrap portion of the scroll member is deformed due to, for example, the pressure of the fluid generated in the compression chamber or the compression heat, the wrap portions of the first and second scroll members are in contact with each other or interfere with each other. And the reliability of the apparatus can be improved, and the lifetime can be extended.

  According to the second aspect of the present invention, the wrap portion of at least one of the first and second scroll members is orthogonal to the direction in which the cooling fin extends through the center of the wrap portion. Since the thin wall portion is formed by shaving the inner peripheral surface in the vicinity of the line to be cut, for example, the wrap portion of the scroll member is deformed due to the influence of fluid pressure, compression heat, etc. generated in the compression chamber However, the first and second scroll members can maintain the radial gap between the wrap portions at an appropriate (almost equal) level, and can prevent the performance of the scroll fluid machine from being deteriorated.

  Moreover, since the invention of Claim 3 is set as the structure which forms the other thin part in the outer peripheral surface of the vicinity of the site | part orthogonal to the direction where a cooling fin extends in the lap | wrap part of one scroll member, these Even in the thin portion, the radial gap between the wrap portions can be kept substantially uniform, and the performance of the apparatus can be improved.

  Furthermore, in the invention according to claim 4, since one of the scroll members is constituted by a fixed scroll, for example, compared to a turning scroll having a boss portion on the back side and having high deformation resistance, cooling is provided on the back side. By forming a thin part on the wrap part of the fixed scroll that has only fins and has low deformation resistance, it is possible to prevent the wrap part of the fixed scroll and the orbiting scroll from contacting or interfering with each other. It is possible to improve the performance and extend the life.

  Hereinafter, a scroll type air compressor will be described as an example of a scroll type fluid machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS. 1 to 7 of the accompanying drawings.

  In the figure, reference numeral 1 denotes a cylindrical casing forming an outer frame of a scroll type fluid machine. The casing 1 is formed in a large diameter cylindrical portion 1A and a cylindrical shape having a smaller diameter than the large diameter cylindrical portion 1A. A small-diameter bearing tube portion 1B protruding outward from one axial direction side of the diameter tube portion 1A, and an annular portion 1C formed between the bearing tube portion 1B and the large-diameter tube portion 1A. ing.

  Reference numeral 2 denotes a fixed scroll as a first scroll member that forms a fixed side member together with the casing 1, and the fixed scroll 2 has a large diameter cylindrical portion so as to close the large diameter cylindrical portion 1 </ b> A of the casing 1 from the other side in the axial direction. Fixed to the other side (opening side) of 1A. The fixed scroll 2 has a substantially disc-shaped end plate 2A disposed so that the center thereof coincides with the axis O1-O1 of the casing 1, and the center side of the end surface of the end plate 2A becomes the winding start end, and the outer peripheral side ends. It is roughly constituted by a spiral wrap portion 2B standing upright as an end.

  Further, a plurality of cooling fins 2C, 2C,... Are formed on the rear surface side of the end plate 2A of the fixed scroll 2, and these cooling fins 2C are parallel to each other, for example, along the line XX in FIG. It extends in one direction. The cooling fins 2C are separated from each other in the direction of a YY line (a line passing through the center O1 of the wrap portion 2B and orthogonal to the XX line) shown in FIG. By circulating the wind between the cooling fins 2C, the end plate 2A of the fixed scroll 2 is cooled from the back side.

  Reference numerals 3 and 3 denote suction ports provided in the fixed scroll 2. Each suction port 3 is formed on the outer peripheral side of the end plate 2A as shown in FIGS. 17 (see FIG. 1) or the like is sucked into the compression chamber 9.

  Reference numeral 4 denotes a discharge port provided in the fixed scroll 2 located on the center side of the end plate 2A. The discharge port 4 discharges compressed air compressed in a compression chamber 9 described later as shown in FIG. To the outside.

  Reference numeral 5 denotes a orbiting scroll as a second scroll member. The orbiting scroll 5 is provided in the large-diameter cylindrical portion 1A of the casing 1 so as to be orbitable facing the fixed scroll 2 as shown in FIG. As shown in FIG. 1, the orbiting scroll 5 includes an orbiting scroll body 6 that faces the fixed scroll 2 in the axial direction of the casing 1, and a back plate 7 that is fixed to the back side of the orbiting scroll body 6. It is comprised by.

  Here, the orbiting scroll main body 6 is composed of a mirror plate 6A formed in a substantially disc shape and a spiral wrap portion 6B erected from the mirror plate 6A toward the fixed scroll 2 side. Further, the end plate 6A of the orbiting scroll body 6 is formed with a plurality of cooling fins 6C, 6C,... Between the rear plate 7 and these cooling fins 6C are the same as the cooling fins 2C of the fixed scroll 2. It extends in one direction (for example, a direction parallel to the line XX shown in FIG. 2), and cools the end plate 6A of the orbiting scroll 5 with cooling air from the cooling fan 16.

  The back plate 7 of the orbiting scroll 5 is fixed to the back side of the end plate 6 </ b> A using a plurality of bolts and the like, and a cylindrical boss 7 </ b> A is integrally formed on the center side of the back plate 7. And in this boss | hub part 7A, the crank part 10A of the drive shaft 10 mentioned later is rotatably attached via the turning bearing 13 grade | etc.,.

  Further, on the outer peripheral side of the back plate 7, for example, three auxiliary crank mechanisms 8 (only one is shown in FIG. 1) are provided spaced apart from the annular portion 1C of the casing 1 in the circumferential direction. . These auxiliary crank mechanisms 8 prevent the orbiting scroll 5 from rotating in the casing 1 and compensate for the orbiting movement with an eccentricity e described later.

  9, are a plurality of compression chambers formed between the fixed scroll 2 and the orbiting scroll 5, and these compression chambers 9 include the wrap portion 2B of the fixed scroll 2 and the orbiting scroll 5 (the orbiting scroll main body 6). By arranging the wrap portion 6B so as to overlap with each other by a predetermined angle, the wrap portion 6B is constituted by a plurality of sealed spaces formed therebetween.

  Each compression chamber 9 is continuously reduced between the wrap portions 2B and 6B when the orbiting scroll 5 is revolving by a drive shaft 10 which will be described later, and for example, fluid such as air is supplied from the suction filter 17 side which will be described later. While sucking, the compressed air at this time is discharged to the outside from a discharge pipe 18 described later.

  Reference numeral 10 denotes a drive shaft rotatably provided in the bearing tube portion 1B of the casing 1 via bearings 11 and 12. The drive shaft 10 has one axial direction from the bearing tube portion 1B to the outside of the casing 1. The other side (front end side) in the axial direction is a crank portion 10 </ b> A that extends into the large-diameter cylindrical portion 1 </ b> A of the casing 1.

  Here, the crank portion 10A is formed such that its axis O2-O2 is eccentric with respect to the axis O1-O1 of the casing 1 (drive shaft 10) by the amount of eccentricity e shown in FIG. The crank portion 10 </ b> A is rotatably attached to the boss portion 7 </ b> A of the orbiting scroll 5 (back plate 7) via the orbiting bearing 13. Further, the drive shaft 10 is integrally provided with a balance weight portion 10C as shown in FIG. 1, and the balance weight portion 10C balances the rotation of the drive shaft 10.

  Reference numeral 14 denotes a pulley provided on the projecting end side of the drive shaft 10, and the pulley 14 is connected to an electric motor serving as a drive source via a belt (none of which is shown) and the drive shaft according to the rotation of the electric motor. 10 is driven to rotate.

  Reference numeral 15 denotes a fan casing provided on the bearing tube portion 1B side of the casing 1, 16 denotes a cooling fan provided in the fan casing 15, and the cooling fan 16 is provided with a bolt or the like on the pulley 14 as shown in FIG. And rotate together with the pulley 14. The cooling fan 16 generates cooling air in the fan casing 15 and cools the casing 1, the fixed scroll 2, the orbiting scroll 5 and the like by this cooling air.

  Reference numerals 17 and 17 denote suction filters provided on the outer peripheral side of the fixed scroll 2, and these suction filters 17 are air that is sucked into the compression chamber 9 from the outside of the fixed scroll 2 through the suction ports 3. It also functions as a silencer that reduces air intake noise and the like.

  Reference numeral 18 denotes a discharge pipe provided on the center side of the end plate 2 </ b> A of the fixed scroll 2 via the discharge port 4. The discharge pipe 18 includes a plurality of compression chambers 9 formed between the fixed scroll 2 and the orbiting scroll 5. Among these, the innermost circumferential side (maximum pressure side) compression chamber 9 communicates with the discharge port 4, and for example, compressed air is discharged toward an external air tank (not shown) or the like.

  Next, 21A to 21F are thin portions provided on the wrap portion 2B of the fixed scroll 2, and these thin portions 21A to 21F are formed in the vicinity of the portion of the wrap portion 2B that intersects the YY line in FIG. Has been. That is, as shown in FIG. 2, the thin-walled portions 21 </ b> A to 21 </ b> F are in the vicinity of a portion where the tangential direction of the spiral by the wrap portion 2 </ b> B is substantially parallel to the X-X line, It is formed by applying a shaving.

  In this case, the thinnest portion 21A located on the outermost side of the thinned portions 21A to 21F is on the inner peripheral surface in the vicinity of the portion intersecting with the YY line at a position close to the outermost peripheral side of the lap portion 2B as shown in FIG. It is formed by forming an arc to cut the meat. As shown in FIG. 2, the thin portion 21B is circularly formed on the inner peripheral surface in the vicinity of the portion intersecting with the YY line at a position separated from the thin portion 21A by an angle of about 180 degrees inwardly in the spiral direction of the wrap portion 2B. It is formed by cutting the meat in an arc shape.

  Further, as shown in FIG. 2, the thin portion 21C is approximately 180 degrees away from the thin portion 21B to the inside of the wrap portion 2B in the spiral direction (inward from the thin portion 21A by about one turn) at the YY line. It is formed by making an arc shape on the inner peripheral surface in the vicinity of the part that intersects with and cutting the surface. The thin wall portion 21D is located approximately 180 degrees away from the thin wall portion 21C to the inside of the wrap portion 2B in the spiral direction (inward from the thin wall portion 21B by about one turn), in the vicinity of the portion intersecting the YY line. The inner peripheral surface is formed by arc-cutting and shaving.

  Further, as shown in FIG. 2, the thin portion 21E is located approximately 180 degrees away from the thin portion 21D to the inside of the wrap portion 2B in the spiral direction (inward from the thin portion 21C by about one turn) at the YY line. It is formed by making an arc shape on the inner peripheral surface in the vicinity of the part that intersects with and cutting the surface. The thin wall portion 21F is located approximately 180 degrees away from the thin wall portion 21E to the inside of the wrap portion 2B in the spiral direction (inward from the thin wall portion 21D by about one turn), in the vicinity of the portion that intersects the YY line. The inner peripheral surface is formed by arc-cutting and shaving.

  For reasons described later, the deformation of the wrap portion 2B is smaller on the inner peripheral side than on the outer peripheral side of the wrap portion 2B. For this reason, among the thin portions 21A to 21F described above, the thin portions 21E and 21F located closer to the inner peripheral side of the wrap portion 2B are not necessarily provided, and in some cases, these thin portions 21E and 21F are omitted. May be.

  22A to 22F are other thin portions provided on the lap portion 2B of the fixed scroll 2, and these thin portions 22A to 22F are located in the vicinity of a portion of the wrap portion 2B that is substantially orthogonal to the line XX in FIG. Is formed. That is, as shown in FIG. 2, the thin portions 22 </ b> A to 22 </ b> F are in the vicinity of a portion where the tangential direction of the spiral by the wrap portion 2 </ b> B is substantially perpendicular to the XX line (substantially parallel to the YY line). It is formed by cutting the outer peripheral surface over a predetermined angle range.

  In this case, the thin-walled portion 22A located on the outermost side of the thin-walled portions 22A to 22F is a circle on the outer peripheral surface near the portion intersecting with the XX line at a position close to the outermost peripheral side of the lap portion 2B as shown in FIG. It is formed by cutting the meat in an arc shape. As shown in FIG. 2, the thin-walled portion 22B has an arcuate shape on the outer peripheral surface in the vicinity of the portion intersecting with the XX line at a position separated from the thin-walled portion 22A by an angle of about 180 degrees inward of the wrap portion 2B It is formed by performing the meat shaving.

  Further, as shown in FIG. 2, the thin-walled portion 22C is located approximately 180 degrees away from the thin-walled portion 22B to the inside of the wrap portion 2B in the spiral direction (inward from the thin-walled portion 22A by about one turn) at the XX line. It is formed by making an arc shape on the outer peripheral surface in the vicinity of the part that intersects with the surface of the surface. The thin portion 22D is located approximately 180 degrees away from the thin portion 22C to the inside of the wrap portion 2B in the spiral direction (about one turn from the thin portion 22B), and in the vicinity of the portion that intersects the XX line. It is formed by forming a circular arc on the outer peripheral surface.

  Further, as shown in FIG. 2, the thin-walled portion 22E is located approximately 180 degrees away from the thin-walled portion 22D to the inner side in the spiral direction of the lap portion 2B (inward from the thin-walled portion 22C by about one turn). It is formed by making an arc shape on the outer peripheral surface in the vicinity of the part that intersects with the surface of the surface. The thin portion 22F is located approximately 180 degrees away from the thin portion 22E to the inside of the wrap portion 2B in the spiral direction (inward from the thin portion 22D by about one turn), in the vicinity of the portion intersecting the XX line. It is formed by forming a circular arc on the outer peripheral surface.

  Of the thin-walled portions 22A to 22F described above, the thin-walled portions 22E and 22F located closer to the inner peripheral side of the wrap portion 2B are not necessarily provided, and in some cases, these thin-walled portions 22E and 22F are omitted. It may be.

  The scroll fluid machine according to the present embodiment has the above-described configuration. Next, the operation when used as an air compressor will be described.

  First, when the drive shaft 10 is rotationally driven by an electric motor or the like via the pulley 14, the rotation of the drive shaft 10 is transmitted from the crank portion 10 </ b> A to the orbiting scroll 5 via the orbiting bearing 13. The orbiting scroll 5 is prevented from rotating by the auxiliary crank mechanisms 8 and is given a revolving motion with an eccentricity e about the axis O 1 -O 1 of the drive shaft 10.

  Then, the orbiting motion of the orbiting scroll 5 continuously reduces the compression chambers 9, 9,... Defined between the wrap portion 2B of the fixed scroll 2 and the wrap portion 6B of the orbiting scroll 5. Thereby, each compression chamber 9 discharges this compressed air from the discharge pipe 18 toward an external air tank while sequentially compressing the air sucked from the suction filter 17 side.

  Here, the fixed scroll 2 and the orbiting scroll 5 (the orbiting scroll main body 6) leak compressed air from each compression chamber 9 by making the radial gap formed between the wrap portions 2B and 6B as small as possible. And the efficiency as an air compressor is increased.

  Further, the end plate 2A of the fixed scroll 2 is provided with a plurality of cooling fins 2C, 2C,... Extending in parallel with each other in one direction (the XX line in FIG. 2) on the back side thereof. The end plate 2A is cooled from the back side by circulating cooling air along the fins 2C, so that the spiral wrap 2B is prevented from being deformed by the influence of compression heat or the like.

  By the way, in such a fixed scroll 2, the cooling fins 2 </ b> C provided on the back side of the end plate 2 </ b> A extend in parallel with each other along the line XX in FIGS. 2 and 5. The rigidity is high in the direction of the XX line where the cooling fin 2C extends, and the rigidity tends to be low in the direction of the YY line perpendicular thereto.

  For this reason, for example, when the wrap portion 2B of the fixed scroll 2 is deformed due to the influence of the pressure of compressed air generated in the compression chamber 9, compression heat, etc., the wrap portion 2B is indicated by an arrow F1 shown in FIG. , F1 direction, the diameter of the fixed scroll 2 may be deformed as illustrated in FIG. 6, and the entire fixed scroll 2 may be deformed as illustrated in FIG.

  And the lap | wrap part 2B of the fixed scroll 2 deform | transforms the tooth | gear tip side of the wrap part 2B like the characteristic line 23 shown as a continuous line in FIG. 7, and the tooth root side of the wrap part 2B is a two-dot chain line in FIG. As shown by the characteristic line 24 shown in FIG. In addition, a characteristic line 25 indicated by a broken line in FIG. 7 represents a deformation on the tooth base side in the lap portion 6B of the orbiting scroll 5.

  In this case, the characteristic lines 23 and 24 in FIG. 7 indicate the angle from the winding start end (inner peripheral end) of the wrap portion 2B in radians (rad). The position of 1 radian is a position away from the winding start end of the wrap portion 2B by about 180 degrees (about 1/2 turn) outward in the spiral direction. Further, for example, the position of 6.3 radians is a position separated from the winding start end of the wrap portion 2B by about 360 degrees (about one turn) outward in the spiral direction.

  Then, as illustrated by the characteristic line 23 in FIG. 7, a position that is about 11 radians from the winding start end of the wrap portion 2 </ b> B (for example, a position corresponding to the thin portion 21 </ b> D in FIG. 2), about 14.1 radians. (Position corresponding to the thin portion 21C in FIG. 2), position corresponding to about 17.2 radians (position corresponding to the thin portion 21B in FIG. 2), position corresponding to about 20.4 radians (FIG. 2). The radial gap formed between the fixed scroll 2 and the wrap portions 2B and 6B of the orbiting scroll 5 is smaller than the original radial gap S in the vicinity of the thin-walled portion 21A. It turns out that it is uneven.

  Therefore, in the present embodiment, the thin-walled portions 21A, 21B, 21C, 21D, and 21E are located at positions where the tangential direction of the spiral of the fixed scroll 2 is substantially parallel to the XX line in FIG. , 21F. That is, these thin-walled portions 21A, 21B, 21C, 21D, 21E, and 21F are shaved over a predetermined angle range on the inner peripheral side in the vicinity of the portion of the lap portion 2B that intersects the YY line in FIG. It is set as the structure formed by giving.

  As a result, for example, the wrap portion 2B of the fixed scroll 2 is deformed so as to be compressed in the directions indicated by arrows F1 and F1 in FIG. 5 due to the influence of the pressure of compressed air generated in each compression chamber 9 and the compression heat. Even so, the fixed scroll 2 and the orbiting scroll 5 can properly maintain the radial gap between the wrap portions 2B and 6B.

  That is, as shown by the characteristic line 23 shown by a solid line in FIG. 7, the thin portions 21 </ b> A to 21 </ b> F are formed by shaving the inner peripheral side of the lap portion 2 </ b> B at a position where the radial gap is smaller than the original gap S. As a result, the radial gap between the wrap portions 2B and 6B can be kept substantially uniform, and the compressed air can be prevented from leaking from each compression chamber 9.

  Moreover, in this Embodiment, among the lap | wrap parts 2B of the fixed scroll 2, the position where the tangent direction of the spiral becomes substantially parallel to the YY line in FIG. 2, that is, the X in FIG. The other thin wall portions 22A, 22B, 22C, 22D, 22E, and 22F are formed by performing the shaving over a predetermined angular range on the outer peripheral side in the vicinity of the portion that intersects the -X-ray.

  Therefore, for example, even if the wrap portion 2B of the fixed scroll 2 is deformed in the directions indicated by arrows F2 and F2 in FIG. 5 due to the influence of the pressure of compressed air generated in each compression chamber 9, compression heat, etc., the fixed scroll 2 and the orbiting scroll 5 can keep the radial gap between the wrap portions 2B and 6B substantially uniform, and can prevent leakage of compressed air from the compression chambers 9.

  Therefore, according to the present embodiment, even when the wrap portions 2B and 6B of the fixed scroll 2 and the orbiting scroll 5 are deformed due to the pressure of compressed air generated in each compression chamber 9, the heat of compression, etc. The lap portions 2B and 6B can be prevented from contacting or interfering with each other, and the performance as a scroll type fluid machine can be improved, the reliability of the apparatus can be improved, and the life thereof can be extended.

  In the embodiment described above, the case where the thin portions 21A to 21F are formed on the inner peripheral side of the lap portion 2B of the fixed scroll 2 has been described as an example. However, the present invention is not limited to this. For example, the thin-walled portions 21E and 21F located closer to the inner peripheral side of the wrap portion 2B may be omitted depending on circumstances. Further, the thin portions 22E and 22F located closer to the inner peripheral side of the wrap portion 2B may be omitted depending on circumstances.

  Moreover, in the said embodiment, the case where thin part 21A-21F and 22A-22F were formed in the lap | wrap part 2B of the fixed scroll 2 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the wrap portion 6B of the orbiting scroll 5 may be configured to form a thin portion substantially similar to the thin portions 21A to 21F and 22A to 22F. In particular, in the orbiting scroll, it is possible to provide a thin portion at a location where the lap portion is partially deformed by heat toward the inner peripheral side or the outer peripheral side by the arrangement of fins and bosses integrally provided on the back side of the end plate. It ’s good.

  In addition, when each lap portion is partially deformed by heat toward the inner peripheral side or the outer peripheral side depending on the position of the auxiliary crank as a rotation prevention mechanism provided between the fixed scroll and the orbiting scroll or between the casing and the orbiting scroll. Even so, the thin portion may be formed.

  Moreover, in the said embodiment, it demonstrated as what provides thin part 22A-22F in the outer peripheral side of the lap | wrap part 2B of the fixed scroll 2, for example. However, the present invention is not limited to this, and for example, a built-up portion may be provided on the inner peripheral side of the portion where the thin-walled portion is provided on the outer peripheral side within a range not exceeding the radial gap. In the case of such a configuration, it is possible to eliminate the decrease in efficiency due to the provision of the thin portion.

  Moreover, in the said embodiment, the scroll type fluid machine which consists of the fixed scroll 2 and the turning scroll 5 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, as described in Japanese Patent Laid-Open No. 3-145588, various types such as a scroll-type fluid machine of a full rotation system in which a scroll opposed to a driven scroll rotates synchronously. The present invention can also be applied to the scroll type fluid machine.

  Furthermore, in the said embodiment, the case where a scroll type fluid machine was used as an air compressor was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and may be applied to other scroll type fluid machines including, for example, a refrigerant compressor that compresses refrigerant, a vacuum pump, and the like.

It is a longitudinal section showing a scroll type air compressor by an embodiment of the invention. It is the enlarged front view which looked at the fixed scroll in FIG. 1 as a single unit from the lap part side. It is sectional drawing which looked at the fixed scroll from the arrow III-III direction in FIG. It is sectional drawing which looked at the fixed scroll from the arrow IV-IV direction in FIG. It is a front view substantially the same as FIG. 2 which shows the direction etc. which the lap | wrap part of a fixed scroll deform | transforms. It is a left view of FIG. 5 which shows the deformation | transformation state of a fixed scroll. It is a characteristic diagram when the lap | wrap part of a fixed scroll deform | transforms.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Fixed scroll (1st scroll member)
2A, 6A End plate 2B, 6B Lapping part 2C, 6C Cooling fin 3 Suction port 4 Discharge port 5 Orbiting scroll (second scroll member)
6 orbiting scroll body 7 back plate 9 compression chamber 10 drive shaft 10A crank part 16 cooling fan 21A-21F thin part 22A-22F other thin part

Claims (4)

A first scroll member having a spiral wrap portion standing on the surface of the end plate, and a plurality of wrap portions overlapping the first scroll member disposed on the surface of the end plate, facing the first scroll member. A scroll fluid machine comprising: a second scroll member provided with a wrap portion defining a compression chamber of
The wrap portion of at least one scroll member of the first and second scroll members is arranged on the inner peripheral side or the outer periphery by arranging the members integrally provided on the back side of the end plate of the one scroll member. A scroll type fluid machine characterized in that a portion that is partially deformed by heat to the side is a thin portion. A first scroll member having a spiral wrap portion standing on the surface of the end plate, and a plurality of wrap portions overlapping the first scroll member disposed on the surface of the end plate, facing the first scroll member. And a second scroll member provided with a wrap portion defining a compression chamber, and at least one of the first and second scroll members has one direction on the back side of the end plate In a scroll type fluid machine provided with a plurality of cooling fins extending to
The wrap portion of at least one of the first and second scroll members has a thin portion on the inner peripheral surface in the vicinity of a line passing through the center of the wrap portion and orthogonal to the direction in which the cooling fin extends. A scroll type fluid machine characterized by having a configuration that forms   2. The scroll fluid machine according to claim 1, wherein the wrap portion of the one scroll member is formed with another thin portion on the outer peripheral surface in the vicinity of a portion substantially orthogonal to the direction in which the cooling fin extends. .   4. The scroll fluid machine according to claim 1, wherein the one scroll member is constituted by a fixed scroll provided integrally or separately on a casing.

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