JP2007247526A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor including a seal structure having life longer than that of conventional compressor. <P>SOLUTION: A seal ring 70 is formed by cutting an annular member 7 having a rectangular section once by moving cutting edges 80, 90 in one direction. A first projection part 72 is defined as one end part and a second projection part 74 is defined as another end part, and the first projection part, a joining part 73, a main body part 71 and the second projection part are connected to form an annular column body after the cutting. Then, the joining part include a stress dispersion surface Pc3. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention particularly relates to a compressor having a long-life seal performance in a back pressure space.

Conventionally, an annular groove is provided in the portion of the housing that faces the back of the movable scroll, and a seal ring is disposed in the groove to form a sealed back pressure space to press the movable scroll toward the fixed scroll. There is a compressor (see, for example, Patent Document 1).
There are various types of such seal rings, but for example, a seal ring 170 as shown in FIGS. 20 to 26 is representative. This seal ring 170 is manufactured by moving a cutting blade 180 having a blade line as shown in FIG. 29 in one direction when viewed along the cutting direction to cut the annular member having a square cross section once. After cutting, as shown in FIG. 26, the first convex portion 172, the main body portion 171 and the second convex portion 174 are connected in this order to form an annular column (note that FIG. 23 shows cutting lines when viewed from the upper side, the lower side, the outer peripheral side, and the inner peripheral side). And the main-body part 171 turns into a circular-arc member with a square cross section, as FIG. 20, 21, and 24 show. As shown in FIG. 25, the first convex portion 172 protrudes from the first corner portion, which is the outer peripheral side of the one end surface of the main body portion 171 and is the upper corner portion, while maintaining a right triangle shape. . As shown in FIG. 25, the second convex portion protrudes while maintaining a pentagonal shape including three right angles from a portion other than the portion corresponding to the first corner portion of the other end surface of the main body portion 171. ing. Such a seal ring 170 is present in the back pressure space because the portion that is cut along the circumferential direction slides in close contact with the outer wall surface of the groove and the back of the movable scroll because the back pressure space becomes high pressure. Prevents high pressure gas from leaking from the back pressure space.
Japanese Patent Publication No. 2006-9614

However, such a seal ring 170 has a problem that stress tends to concentrate on the base portion of the first convex portion 172 and the base portion of the first convex portion 172 is relatively easily broken.
An object of the present invention is to provide a compressor having a seal structure having a longer life than conventional products.

The compressor concerning the 1st invention is provided with a movable scroll, a housing, and a seal ring. The movable scroll has an end plate and a spiral part. The spiral part extends from the first plate surface of the end plate while maintaining the spiral shape in a direction perpendicular to the first plate surface. The housing has an annular ring portion having a square cross section. The seal ring is accommodated in the groove. The seal ring has the first convex portion as one end portion, the second convex portion as the other end portion, the first convex portion, the joint portion, the main body portion, and the second convex portion. It is an annular column connected in order. The main body has a first seal surface and a second seal surface. The first seal surface is a partially cylindrical surface that faces the outer wall surface of the groove. The second seal surface is an arcuate plane that faces the second plate surface that is the surface on the back side of the first plate surface of the end plate. The first convex portion has a third seal surface, a fourth seal surface, and a first sliding surface. The third seal surface is a partially cylindrical surface having the same central axis as the central axis of the first seal surface and the same radius as the first seal surface. The fourth seal surface is on the same plane as the second seal surface and has the same center point and the same radius as the center point and radius of the arc-shaped side that faces the outer wall surface of the groove portion among the sides constituting the second seal surface. It is a surface having an arc-shaped side having a radius of. A 1st sliding surface is a surface containing the edge | side which opposes the bottom face of a groove part among the edges which comprise a 3rd seal surface, and the edge | side which opposes the inner wall face of a groove part among the edges which comprise a 4th seal surface. The joining portion has a fifth seal surface, a sixth seal surface, and a stress dispersion surface. The fifth seal surface is a partially cylindrical surface having the same central axis as the central axis of the first seal surface and the same radius as the first seal surface. The sixth seal surface is a surface including an arc-shaped side that is on the same plane as the second seal surface and faces the outer wall surface of the groove portion among the sides constituting the second seal surface. The stress dispersion surface constitutes an end surface on the joint portion side of the first convex portion and an apex located on the inner wall surface side of the groove portion on the bottom surface side of the groove portion among the apexes constituting the end surface on the joint portion side of the main body portion. It is a surface including a side corresponding to the first sliding surface among the sides. This stress distribution surface may be a curved surface or a flat surface (an inclined surface with respect to a surface orthogonal to the arc direction of the first seal surface). Further, when the stress distribution surface is a flat surface, the stress distribution surface and the side facing the bottom surface of the groove portion among the sides constituting the third seal surface and the inner wall surface of the groove portion among the sides constituting the fourth seal surface The angle formed with the “plane including the opposite sides” is preferably 135 ° or more and 150 ° or less. The second convex portion has a seventh seal surface, an eighth seal surface, and a second sliding surface. The seventh seal surface is a partially cylindrical surface that has the same central axis as the central axis of the first seal surface and the same radius as the first seal surface and is continuous with the first seal surface. The eighth seal surface is on the same plane as the second seal surface and has the same center point and the same radius as the center point and radius of the arc-shaped side that faces the inner wall surface of the groove among the sides constituting the second seal surface. It is a surface having an arc-shaped side having a radius of. The second sliding surface includes a side that faces the second plate surface of the end plate among the sides that constitute the seventh seal surface and a side that faces the outer wall surface of the groove portion among the sides that constitute the eighth seal surface. In this case, the surface faces the first sliding surface. In this seal ring, when all of the first sliding surface and all of the second sliding surface are combined, the first sealing surface, the third sealing surface, the fifth sealing surface, and the seventh sealing surface are cylindrical. The second sealing surface, the fourth sealing surface, the sixth sealing surface, and the eighth sealing surface form a planar annular sealing surface.
In this compressor, a joint portion is provided between the main body portion of the seal ring and the first convex portion, and a stress dispersion surface is provided in the joint portion. For this reason, in this compressor, the base part of the 1st convex-shaped part of a seal ring becomes difficult to break compared with the conventional product. Therefore, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

A compressor according to a second aspect of the present invention is the compressor according to the first aspect of the present invention, wherein the seal ring is generated by moving the cutting blade in one direction and cutting the annular member having a square cross section once. The “cutting blade” referred to here has a first blade line, a second blade line, and a third blade line. The first edge line is an edge line that is a straight line when viewed along the cutting direction. When viewed along the cutting direction, the second blade line extends from one end of the first blade line toward an angle direction of 0 ° or more and less than 180 ° with respect to the first blade line. The second edge line may be a curve or a straight line. The angle direction of the second blade line is preferably around 90 °. The third blade line extends in an angular direction larger than 180 ° and smaller than 270 ° with respect to the first blade line from the other end of the first blade line when viewed along the cutting direction. The third edge line may be a curve or a straight line. It is more preferable that the third blade line extends in an angular direction of 210 ° to 225 ° with respect to the first blade line.
In this compressor, the seal ring is generated by moving the cutting blade in one direction and cutting the annular member having a square cross section once. For this reason, in this compressor, the manufacturing cost of the seal ring can be kept low.

A compressor according to a third invention is the compressor according to the first invention or the second invention, wherein a part of the first sliding surface is a part of the second sliding surface during a turning motion of the movable scroll. Contact. That is, the diameter of the seal ring is enlarged during the orbiting movement of the movable scroll.
In this compressor, during the turning motion of the movable scroll, a part of the first sliding surface comes into contact with a part of the second sliding surface. For this reason, in this compressor, the same sealing effect as before can be obtained.

  A compressor according to a fourth aspect of the present invention is the compressor according to any one of the first to third aspects of the present invention, wherein the second convex portion has an end surface on the opposite side to the main body portion side in the arc direction of the first seal surface. Parallel to the plane orthogonal to

  A compressor according to a fifth aspect of the present invention is the compressor according to any one of the first to fourth aspects of the present invention, wherein the corner formed by the first seal surface and the second seal surface, the third seal surface, and the The corner formed by the four seal surfaces, the corner formed by the fifth seal surface and the sixth seal surface, and the corner formed by the seventh seal surface and the eighth seal surface are The chamfer is made larger than the maximum gap between the movable scroll and the housing generated during the orbiting motion.

  In this compressor, a corner formed from the first seal surface and the second seal surface, a corner formed from the third seal surface and the fourth seal surface, and the fifth seal surface and the sixth seal surface The corner portion formed from the chamfer is chamfered to be larger than the maximum gap between the movable scroll and the housing which is generated during the turning motion of the movable scroll. For this reason, in this compressor, the generation | occurrence | production of the level | step difference by wear of the seal ring outer peripheral part (a part by the side of the 1st seal surface, the 3rd seal surface, and the 5th seal surface) is eliminated, and the catch phenomenon is prevented. Further, the seal ring can be prevented from being caught in the gap between the movable scroll and the housing. That is, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

  A compressor according to a sixth aspect of the present invention includes a movable scroll, a housing, and a seal ring. The movable scroll has an end plate and a spiral part. The spiral part extends from the first plate surface of the end plate while maintaining the spiral shape in a direction perpendicular to the first plate surface. The housing has an annular ring portion having a square cross section. The seal ring is accommodated in the groove. The seal ring is produced by moving the cutting blade in one direction and cutting the annular member having a square cross section once. The annular member has an eleventh seal surface, a twelfth seal surface, an eleventh opposite surface, and a twelfth opposite surface. The eleventh seal surface is a cylindrical surface facing the outer wall surface of the groove. The twelfth seal surface is an annular flat surface facing the second plate surface that is the surface on the back side of the first plate surface of the end plate. The eleventh opposite surface is a cylindrical surface facing the inner wall surface of the groove. The twelfth opposite surface is an annular plane that faces the bottom surface of the groove. The “cutting blade” referred to here has a first blade line, a second blade line, and a third blade line. The first edge line is an edge line that is a straight line when viewed along the cutting direction. When viewed along the cutting direction, the second blade line extends from one end of the first blade line toward an angle direction of 0 ° or more and less than 180 ° with respect to the first blade line. When viewed along the cutting direction, the third blade line extends from the other end of the first blade line in an angular direction larger than 180 ° and smaller than 270 ° with respect to the first blade line. In addition, it is more preferable that this 3rd blade line extends toward the angle direction of 210 degrees or more and 225 degrees or less with respect to a 1st blade line. Then, the first blade line passes only through the eleventh seal surface and the twelfth seal surface, and the second plate surface among the sides constituting the eleventh seal surface, the twelfth seal surface, and the eleventh seal surface. The third blade line passes through only the side on the side, and the third blade line is the eleventh seal surface, the twelfth seal surface, the eleventh opposite surface, the twelfth opposite surface, the side on the bottom surface side of the groove portion among the sides constituting the eleventh seal surface, and When the cutting blade is moved in one direction so as to pass only the side constituting the eleventh opposite surface and the annular member is cut once, this seal ring is completed.

  In this compressor, the seal ring is generated by moving the cutting blade in one direction and cutting the annular member having a square cross section once. The cutting blade includes a third blade line extending in an angular direction larger than 180 ° and smaller than 270 ° from the other end of the first blade line when viewed along the cutting direction. Is provided. For this reason, in this compressor, the part which relieves stress concentration is formed between the main-body part of this seal ring, and a 1st convex-shaped part. Therefore, in this compressor, the first convex portion of the seal ring is less likely to break than the conventional product. As a result, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

  A compressor according to a seventh aspect of the present invention includes a movable scroll, a housing, and a seal ring. The movable scroll has an end plate and a spiral part. The spiral part extends from the first plate surface of the end plate while maintaining the spiral shape in a direction perpendicular to the first plate surface. The housing has an annular ring portion having a square cross section. The seal ring is accommodated in the groove. The seal ring has a 21st seal surface and a 22nd seal surface. The 21st seal surface is a partial cylindrical surface facing the outer wall surface of the groove. The twenty-second seal surface is a surface that is an arc-shaped flat surface facing the second plate surface that is the surface on the back side of the first plate surface of the end plate. Further, in this seal ring, the corner portion formed by the 21st seal surface and the 22nd seal surface is chamfered to be larger than the maximum gap between the movable scroll and the housing generated during the orbiting motion of the movable scroll.

  In this compressor, the corner formed by the 21st seal surface and the 22nd seal surface is chamfered to be larger than the maximum gap between the movable scroll and the housing generated during the orbiting motion of the movable scroll. For this reason, in this compressor, the generation | occurrence | production of the level | step difference by abrasion of a seal ring outer peripheral part is eliminated, and a catching phenomenon is prevented. Further, the seal ring can be prevented from being caught in the gap between the movable scroll and the housing. That is, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

In the compressor according to the first aspect of the present invention, the root portion of the first convex portion of the seal ring is less likely to break than the conventional product. Therefore, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.
In the compressor according to the second invention, the manufacturing cost of the seal ring can be kept low.
In the compressor according to the third aspect of the invention, the same sealing effect as that of the prior art can be obtained.

In the compressor according to the fifth aspect of the present invention, the occurrence of a step due to wear on the outer peripheral portion of the seal ring is eliminated, and the catching phenomenon is prevented. Further, the seal ring can be prevented from being caught in the gap between the movable scroll and the housing. That is, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.
In the compressor according to the sixth aspect of the present invention, a portion for relaxing stress concentration is formed between the main body portion of the seal ring and the first convex portion. Therefore, in this compressor, the first convex portion of the seal ring is less likely to break than the conventional product. As a result, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

  In the compressor according to the seventh aspect of the present invention, the occurrence of a step due to wear of the outer peripheral portion of the seal ring is eliminated, and the catching phenomenon is prevented. Further, the seal ring can be prevented from being caught in the gap between the movable scroll and the housing. That is, in this compressor, the lifetime of the seal structure can be made longer than that of the conventional product.

  The high-low pressure dome type scroll compressor 1 according to the present embodiment constitutes a refrigerant circuit together with an evaporator, a condenser, an expansion mechanism, and the like, and plays a role of compressing a gas refrigerant in the refrigerant circuit, As shown in FIG. 1, it mainly comprises a vertically cylindrical sealed dome-shaped casing 10, a scroll compression mechanism 15, an Oldham ring 39, a drive motor 16, a lower main bearing 60, a suction pipe 19, and a discharge pipe 20. Has been. Hereinafter, the components of the high-low pressure dome compressor 1 will be described in detail.

[Details of components of the high and low pressure dome compressor]
(1) Casing The casing 10 includes a substantially cylindrical trunk casing portion 11, a bowl-shaped upper wall portion 12 that is airtightly welded to the upper end portion of the trunk casing portion 11, and a lower end of the trunk casing portion 11. And a bowl-shaped bottom wall portion 13 which is welded to the portion in an airtight manner. The casing 10 mainly accommodates a scroll compression mechanism 15 that compresses a gas refrigerant and a drive motor 16 that is disposed below the scroll compression mechanism 15. The scroll compression mechanism 15 and the drive motor 16 are connected by a drive shaft 17 disposed so as to extend in the vertical direction in the casing 10. As a result, a gap space 18 is generated between the scroll compression mechanism 15 and the drive motor 16.

(2) Scroll Compression Mechanism As shown in FIG. 1, the scroll compression mechanism 15 mainly includes a housing 23, a fixed scroll 24 disposed in close contact with the housing 23, and a movable meshing with the fixed scroll 24. And a scroll 26. Hereinafter, the components of the scroll compression mechanism 15 will be described in detail.

a) Housing The housing 23 is press-fitted and fixed to the body casing portion 11 over the entire outer circumferential surface in the circumferential direction. That is, the body casing part 11 and the housing 23 are in close contact with each other in an airtight manner over the entire circumference. For this reason, the inside of the casing 10 is partitioned into a high pressure space 28 below the housing 23 and a low pressure space 29 above the housing 23. The fixed scroll 24 is fastened and fixed to the housing 23 with bolts 38 so that the upper end surface is in close contact with the lower end surface of the fixed scroll 24. The housing 23 is formed with a housing recess 31 that is recessed at the center of the upper surface, and a bearing portion 32 that extends downward from the center of the lower surface. A bearing hole 33 penetrating in the vertical direction is formed in the bearing portion 32, and the drive shaft 17 is rotatably fitted in the bearing hole 33 via a bearing 34. Further, a seal ring groove 23a is dug in the housing 23 in a flat portion facing the back surface of the movable scroll 26, and a seal ring 70 is accommodated in the seal ring groove 23a.

c) Fixed Scroll The fixed scroll 24 is mainly composed of an end plate 24a and a spiral (involute) wrap 24b formed on the lower surface of the end plate 24a. A discharge passage 41 that communicates with the compression chamber 40 (described later) and an enlarged recess 42 that communicates with the discharge passage 41 are formed in the end plate 24a. The discharge passage 41 is formed so as to extend in the vertical direction at the central portion of the end plate 24a. The enlarged concave portion 42 is constituted by a concave portion that is recessed in the upper surface of the end plate 24a and extends in the horizontal direction. A lid 44 is fastened and fixed to the upper surface of the fixed scroll 24 by bolts 44 a so as to close the enlarged concave portion 42. And the muffler space 45 which consists of an expansion chamber which silences the driving | running | working sound of the scroll compression mechanism 15 by covering the expansion recessed part 42 with the cover body 44 is formed. The fixed scroll 24 and the lid 44 are sealed by being brought into close contact via a packing (not shown).

c) Movable Scroll The movable scroll 26 mainly includes an end plate 26a, a spiral (involute) wrap 26b formed on the upper surface of the end plate 26a, a bearing portion 26c formed on the lower surface of the end plate 26a, and the end plate 26a. And Oldham key grooves (not shown) formed at both ends. The movable scroll 26 is supported by the housing 23 by fitting an Oldham ring 39 (described later) into the Oldham keyway. Further, the upper end of the drive shaft 17 is fitted into the bearing portion 26c. The movable scroll 26 revolves in the housing 23 without being rotated by the rotation of the drive shaft 17 by being incorporated in the scroll compression mechanism 15 in this way. The wrap 26b of the movable scroll 26 is meshed with the wrap 24b of the fixed scroll 24, and a compression chamber 40 is formed between the contact portions of both the wraps 24b and 26b. In the compression chamber 40, the volume between the laps 24b and 26b contracts toward the center as the movable scroll 26 revolves. In the high-low pressure dome type scroll compressor 1 according to the present embodiment, the gas refrigerant is compressed in this way.

d) Seal ring (Overview)
The seal ring 70 is a member for forming a back pressure space in cooperation with the back surface of the movable scroll 26 and the housing 23. This seal ring 70 moves the annular member 7 once as shown in FIGS. 30 to 32 by moving a cutting blade 80 having a blade line as shown in FIG. 27 in one direction when viewed along the cutting direction. It is manufactured by cutting, and after cutting, as shown in FIG. 19, the first convex portion 72, the joint portion 73, the main body portion 71, and the second convex portion 74 are connected in this order. 3 to 6 show cutting lines when viewed from the upper side, the lower side, the outer peripheral side, and the inner peripheral side. FIGS. 7 and 8 show AA. A cross section and a BB cross section (cross section near the center of the cut portion) are shown.). A specific cutting method will be described in detail later. As shown in FIGS. 30 to 32, the annular member 7 has an annular plane Pu, Pb having a center point C2 above and below and a cylindrical surface Po, Pi having a center axis C1 on the outer peripheral side and the inner peripheral side. Chamfered surface Pt at the upper end on the outer peripheral side, the second annular side L2 at the upper end on the inner peripheral side, the third annular side L3 at the lower end on the inner peripheral side, and the fourth annular side at the lower end on the outer peripheral side L4. Then, after the annular member 7 is appropriately cut by the cutting blade 80 to become the seal ring 70, the upper annular plane (hereinafter referred to as the upper annular plane) Pu faces the back surface of the movable scroll 26. Placed in. In this case, as a matter of course, the lower annular plane (hereinafter referred to as the lower annular plane) Pb faces the bottom surface 23c of the seal ring groove 23a, and the outer peripheral cylindrical surface (hereinafter referred to as the outer peripheral side). Po (referred to as a cylindrical surface) faces the outer wall surface 23b of the seal ring groove 23a, and a cylindrical surface on the inner peripheral side (hereinafter referred to as an inner peripheral side cylindrical surface) Pi faces the inner wall surface 23d of the seal ring groove 23a. . Of these surfaces, the upper annular plane Pu and the outer cylindrical surface Po function as seal surfaces.

Hereinafter, the seal ring 70 is divided into a first convex portion 72, a joint portion 73, a main body portion 71, and a second convex portion 74, and each portion will be described in detail.
The main body 71 is an arc having a cross-sectional shape as shown in FIG. That is, the main body 71 has an arcuate plane corresponding to a part of the upper annular plane Pu (hereinafter referred to as a first upper arcuate plane) Pu1 and a circle corresponding to a part of the lower annular plane Pb. Arc-shaped plane (hereinafter referred to as a first lower arc-shaped plane) Pb1, a partial cylindrical surface corresponding to a part of the outer peripheral cylindrical surface Po (hereinafter referred to as a first outer peripheral partial cylindrical surface) Po1, an inner peripheral cylindrical surface There is a partial cylindrical surface (hereinafter referred to as a first inner peripheral side partial cylindrical surface) Pi1 corresponding to a part of Pi and a partial conical surface (hereinafter referred to as a first chamfered surface) Pt1 corresponding to a part of chamfered surface Pt. Will do.

  The first convex portion 72 is one end portion of the seal ring 70, and as shown in FIGS. 9 to 13, the first convex portion 72 is a substantially rectangular plane (hereinafter referred to as a first plane) corresponding to a part of the upper annular plane Pu. 2) Pu2, a partial cylindrical surface corresponding to a part of the outer peripheral cylindrical surface Po (hereinafter referred to as a second outer peripheral cylindrical surface) Po2, and a partial conical surface corresponding to a part of the chamfered surface Pt. (Hereinafter referred to as a second chamfered surface Pt2). The width (radial length) of the second upper substantially rectangular plane Pu2 is approximately 2/3 of the width (radial length) of the first upper arcuate plane Pu1. The width of the second outer peripheral cylindrical surface Po2 (the length along the central axis C1) is approximately half of the first outer peripheral cylindrical surface Po1. Further, the first convex portion 72 has a flat surface (hereinafter referred to as a first slide surface) Pa2 formed by being cut by the first blade line 81. As is apparent from FIGS. 9 to 12, the first slide surface Pa2 includes a lower side (side on the bottom surface 23c side of the seal ring groove 23a) of the sides constituting the second outer peripheral cylindrical surface Po2. ) L21 and an inner circumferential side (side on the inner wall surface 23d side of the seal ring groove 23a) L22 among the sides constituting the second upper substantially rectangular plane Pu2. Note that the end surface on the tip side of the first convex portion 72 is a surface cut by the second blade line 82.

  The joint portion 73 is a portion that joins the main body portion 71 and the first convex portion 72, and as shown in FIGS. 9 to 12, a plane (hereinafter, referred to as a part of the upper annular plane Pu). The third upper substantially rectangular plane (Pu3), a partial cylindrical surface corresponding to a part of the outer peripheral cylindrical surface Po (hereinafter referred to as a third outer peripheral cylindrical surface) Po3, and a part of the inner peripheral cylindrical surface Pi. A partial cylindrical surface (hereinafter referred to as a third inner peripheral cylindrical surface) Pi3 and a partial conical surface (hereinafter referred to as a third chamfered surface Pt3) corresponding to a part of the chamfered surface Pt exist. Further, the joint 73 has a curved surface (hereinafter referred to as a stress dispersion surface) Pc3 formed by being cut by the third blade line 83. This stress distribution surface Pc3 is the lower vertex of the vertex constituting the end surface of the main body 71 on the joint portion 73 side and the vertex located on the inner peripheral side (the bottom surface 23c side of the seal ring groove 23a and the seal ring groove). 23a (the apex located on the inner wall surface 23d side) (hereinafter referred to as the first apex) V31 rises to the end surface side of the main body portion 71 on the joint portion 73 side, and then the end surface of the first convex portion 71 on the joint portion 73 side. Is a curved surface toward the side L23 corresponding to the first slide surface Pa2.

  The second convex portion 74 is the other end portion of the seal ring 70, and as shown in FIGS. 14 to 18, a substantially rectangular plane (hereinafter referred to as a first plane) corresponding to a part of the upper annular plane Pu. (Referred to as 4 upper substantially rectangular plane) Pu4, arc-shaped plane corresponding to part of the lower annular plane Pb (hereinafter referred to as fourth lower arc-shaped plane) Pb4, equivalent to part of the outer cylindrical surface Po There is a partial cylindrical surface Po4 (hereinafter referred to as a fourth outer peripheral side partial cylindrical surface) Po4 and a partial cylindrical surface (hereinafter referred to as a fourth inner peripheral side partial cylindrical surface) Pi4 corresponding to a part of the inner peripheral side cylindrical surface Pi. Will do. The fourth upper substantially rectangular plane Pu4 exists on the inner peripheral side (that is, the side L41 facing the inner wall surface 23d side of the seal ring groove 23a on the inner peripheral side), and the width ( The length in the radial direction) is approximately 1/3 of the width (the length in the radial direction) of the first upper arcuate plane Pu1. The fourth outer circumferential cylindrical surface Po4 exists on the lower side, and the width (the length along the central axis C1) is approximately half of the first outer circumferential cylindrical surface Po1. Further, the second convex portion 74 has a plane Pa <b> 4 (hereinafter referred to as a second slide surface) formed by cutting with the first blade line 81. As is apparent from FIGS. 14 to 18, the second slide surface Pa4 includes an upper side (side on the back side of the movable scroll 26) L43 among the sides constituting the fourth outer peripheral cylindrical surface Po4. Of the sides constituting the fourth upper substantially square plane Pu2, the outer peripheral side (side on the outer wall surface 23b side of the seal ring groove 23a) L42 is included. The second slide surface Pa4 is a plane corresponding to the first slide surface Pa2. The tip of the second convex portion 74 has an R shape corresponding to the stress dispersion surface Pc3, but has no particular function.

(Seal ring manufacturing method)
-Cutting blade-
The cutting blade 80 used in the present embodiment has a blade line shown in FIG. 27 when viewed along the cutting direction. The blade line is composed of a first blade line 81, a second blade line 82, and a third blade line 83 when viewed along the cutting direction. The first blade line 81 is a straight line when viewed along the cutting direction. When viewed along the cutting direction, the second blade line 82 extends from one end of the first blade line 81 in an angular direction of about 90 ° with respect to the first blade line 81. The third blade line 83 extends toward the side opposite to the side on which the second blade line 82 extends while drawing an arc line from the other end of the first blade line 81 when viewed along the cutting direction.

-Cutting method-
First, when the annular member 7 is viewed from the side, the central axis C1 of the annular member 7 and the cutting direction of the cutting blade 80 form about 45 °, and when viewed along the cutting direction of the cutting blade 80. The radial direction of the annular member 7 and the first blade line 81 are orthogonal to each other, the first blade line 81 overlaps only the upper annular plane Pu of the annular member 7, and the second blade line 82 intersects the chamfered surface Pt. The annular member 7 and the cutting blade 80 are set so that the third blade line 83 intersects the second annular side L2, the inner peripheral cylindrical surface Pi, and the third annular side L3. When the cutting blade 80 is lowered in this state, the first blade line 81 enters the cylindrical member 7 from the upper annular plane Pu and exits to the outer cylindrical surface Po, and the second blade line 82 is the upper annular plane. The cylindrical member 7 enters from the Pu through the chamfered surface Pt to the outer cylindrical surface Po, and the third blade line 83 enters the cylindrical member 7 from the second annular side L2 and the inner annular surface Pu. After passing through part of the circumferential cylindrical surface Pi at the same time, passing through the other part of the inner circumferential cylindrical surface Pi and the third annular side L3, and further passing through part of the lower annular surface Pb, the lower side The other part of the annular surface Pb and a part of the outer cylindrical surface Po are simultaneously removed, and finally the fourth annular side L4 is removed. If the setting direction of the annular member 7 is changed, it is of course possible to cut from the opposite side.

(Seal ring behavior)
When the compressor 1 enters an operating state and the movable scroll 26 starts to make a turning motion, the back pressure space becomes high pressure. At this time, the portion of the seal ring 70 cut by the first blade line 81 slides and comes into close contact with the outer wall surface of the seal ring groove 23a and the back surface of the movable scroll.
e) Communication Path The scroll compression mechanism 15 has a communication path 46 extending between the fixed scroll 24 and the housing 23. The communication passage 46 is formed so that a scroll-side passage 47 formed in the fixed scroll 24 and a housing-side passage 48 formed in the housing 23 communicate with each other. The upper end of the communication passage 46, that is, the upper end of the scroll side passage 47 opens into the enlarged recess 42, and the lower end of the communication passage 46, that is, the lower end of the housing side passage 48 opens into the lower end surface of the housing 23. In other words, the lower end opening of the housing side passage 48 constitutes a discharge port 49 through which the refrigerant in the communication passage 46 flows out into the gap space 18.

(3) Oldham ring The Oldham ring 39 is a member for preventing the rotation of the movable scroll as described above, and is fitted into an Oldham groove (not shown) formed in the housing 23. The Oldham groove is an oval groove and is disposed at a position facing each other in the housing 23.

(4) Drive Motor The drive motor 16 is a DC motor in the present embodiment, and mainly includes an annular stator 51 fixed to the inner wall surface of the casing 10 and a slight gap (air gap) inside the stator 51. The rotor 52 is rotatably accommodated with a passage). The drive motor 16 is arranged such that the upper end of the coil end 53 formed on the upper side of the stator 51 is at substantially the same height as the lower end of the bearing portion 32 of the housing 23.

In the stator 51, a copper wire is wound around a tooth portion, and a coil end 53 is formed above and below. Further, the outer peripheral surface of the stator 51 is provided with core cut portions that are notched at a plurality of locations from the upper end surface to the lower end surface of the stator 51 and at predetermined intervals in the circumferential direction. The core cut portion forms a motor cooling passage 55 extending in the vertical direction between the body casing portion 11 and the stator 51.
The rotor 52 is drivably coupled to the movable scroll 26 of the scroll compression mechanism 15 via a drive shaft 17 disposed at the axial center of the body casing portion 11 so as to extend in the vertical direction. A guide plate 58 that guides the refrigerant that has flowed out of the discharge port 49 of the communication passage 46 to the motor cooling passage 55 is disposed in the gap space 18.

(5) Lower Main Bearing The lower main bearing 60 is disposed in the lower space below the drive motor 16. The lower main bearing 60 is fixed to the body casing portion 11 and constitutes a lower end side bearing of the drive shaft 17 to support the drive shaft 17.

(6) Suction Pipe The suction pipe 19 is for guiding the refrigerant in the refrigerant circuit to the scroll compression mechanism 15 and is fitted into the upper wall portion 12 of the casing 10 in an airtight manner. The suction pipe 19 penetrates the low pressure space 29 in the vertical direction, and an inner end portion is fitted into the fixed scroll 24.
(7) Discharge pipe The discharge pipe 20 is for discharging the refrigerant in the casing 10 to the outside of the casing 10, and is fitted into the body casing portion 11 of the casing 10 in an airtight manner. The inner end opening of the discharge pipe 20, that is, the inflow port, is opened toward the center line of the casing 10.

[Operation of high and low pressure dome type compressor]
When the drive motor 16 is driven, the drive shaft 17 rotates, and the revolving operation is performed without rotating the movable scroll. Then, the low-pressure gas refrigerant is sucked into the compression chamber 40 from the peripheral side of the compression chamber 40 through the suction pipe 19 and is compressed as the volume of the compression chamber 40 changes, and becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the central portion of the compression chamber 40 through the discharge passage 41 to the muffler space 45, and then passes through the communication passage 46, the scroll side passage 47, the housing side passage 48, and the discharge port 49. Then, it flows out into the gap space 18 and flows downward between the guide plate 58 and the inner surface of the body casing portion 11. When the gas refrigerant flows downward between the guide plate 58 and the inner surface of the body casing portion 11, a part of the gas refrigerant is diverted to form a circle between the guide plate 58 and the drive motor 16. Flow in the direction. At this time, the lubricating oil mixed in the gas refrigerant is separated. On the other hand, the other part of the diverted gas refrigerant flows downward in the motor cooling passage 55, flows to the lower motor space, and then reverses to become an air gap passage between the stator 51 and the rotor 52, or to communicate therewith. It flows upward through the motor cooling passage 55 on the side facing the passage 46 (left side in FIG. 1). Thereafter, the gas refrigerant that has passed through the guide plate 58 and the gas refrigerant that has flowed through the air gap passage or the motor cooling passage 55 merge in the gap space 18 and flow into the discharge pipe 20 from the inner end 36 of the discharge pipe 20. And discharged outside the casing 10. The gas refrigerant discharged to the outside of the casing 10 circulates through the refrigerant circuit, and is again sucked into the scroll compression mechanism 15 through the suction pipe 19 and compressed.

[Characteristics of high / low pressure dome type compressor]
(1)
In the high and low pressure dome type compressor 1 according to the embodiment of the present invention, a joint 73 is provided between the main body 71 of the seal ring 70 and the first convex part 72. A stress dispersion surface Pc3 is provided. For this reason, in this high and low pressure dome type compressor 1, the base part of the 1st convex part 71 of seal ring 70 is hard to be broken compared with the conventional product. Therefore, in this high and low pressure dome type compressor 1, the lifetime of the seal structure can be made longer than that of the conventional product.

(2)
In the high and low pressure dome compressor 1 according to the embodiment of the present invention, chamfering is performed on a portion on the outer peripheral side above the seal ring 70. For this reason, in this high and low pressure dome type compressor 1, the generation | occurrence | production of the level | step difference by abrasion of a seal ring outer peripheral part is eliminated, and a catching phenomenon is prevented. Further, the seal ring is prevented from being caught in the gap between the movable scroll and the housing. That is, in the high-low pressure dome type compressor 1, the life of the seal structure can be made longer than that of the conventional product.

[Modification]
(A)
In the previous embodiment, the hermetic type high / low pressure dome type compressor 1 is employed. However, the compressor may be a high pressure dome type compressor. Moreover, a semi-hermetic type or an open type compressor may be used.
(B)
In the compressor 1 according to the previous embodiment, the scroll compression mechanism 15 of the type in which one scroll member is fixed is employed, but the scroll compressor may be a double-tooth or co-rotating type scroll compressor. Good.

(C)
In the compressor 1 according to the previous embodiment, the Oldham ring is employed as the rotation prevention mechanism. However, any mechanism such as a pin, a ball coupling, and a crank may be employed as the rotation prevention mechanism.
(D)
In the previous embodiment, the case where the compressor 1 is used in the refrigerant circuit has been described as an example. However, the application is not limited to air conditioning, and a compressor or a single unit incorporated in a system or A blower, a supercharger, a pump, etc. may be sufficient.

(E)
In the seal ring 70 according to the previous embodiment, the stress dispersion surface Pc3 is a curved surface, but the stress dispersion surface may be a flat surface. Such a seal ring moves the cutting blade 90 having a blade line as shown in FIG. 28 in one direction when viewed along the cutting direction to move the annular member 7 as shown in FIGS. Manufactured by cutting once. Here, the cutting blade 90 includes a fourth blade line 91, a fifth blade line 92, and a sixth blade line 93 when viewed along the cutting direction. Similarly to the first blade line 81 of the cutting blade 80, the fourth blade line 91 is a straight line when viewed along the cutting direction. Similarly to the second blade line 82 of the cutting blade 80, the fifth blade line 92 is an angle of about 90 ° with respect to the fourth blade line 91 from one end of the fourth blade line 91 when viewed along the cutting direction. It extends in the direction. The sixth blade line 93 extends from the other end of the fourth blade line 91 toward the fourth blade line 91 in the angle direction of about 225 ° when viewed along the cutting direction. The angle formed by the sixth blade line 93 and the fourth blade line 91 is preferably 210 ° to 225 °. This is because the stress can be sufficiently dispersed in such a case.

(F)
In the seal ring 70 according to the previous embodiment, the distal end portion of the second convex upper portion 74 has an R shape corresponding to the stress dispersion surface Pc3. However, the distal end portion is cut and orthogonal to the arc direction. An end face parallel to the surface may be used.

  The compressor according to the present invention is useful as a long-life compressor because it has a feature that it has a seal structure that has a longer lifetime than conventional products.

It is a longitudinal cross-sectional view of the high-low pressure dome type compressor which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the detail of the structure of the sealsing vicinity of the high-low pressure dome type compressor which concerns on embodiment of this invention. It is a top view of the seal thing which concerns on embodiment of this invention. It is a bottom view of seal singing concerning an embodiment of the invention. It is an outer side view of the sealing thing which concerns on embodiment of this invention. It is an inner side view of the seal thing which concerns on embodiment of this invention. It is CC sectional drawing of the seal singing concerning embodiment of this invention. It is DD sectional drawing of the sealing thing which concerns on embodiment of this invention. It is an outer side view of the 1st convex-shaped part of the sealing thing which concerns on embodiment of this invention. It is an inner side view of the 1st convex part of the seal singing which concerns on embodiment of this invention. It is a top view of the 1st convex part of the seal singing concerning an embodiment of the invention. It is a bottom view of the 1st convex part of the seal singing concerning an embodiment of the invention. It is a front view of the 1st convex part of the seal singing concerning an embodiment of the invention. It is an outer side view of the 2nd convex-shaped part of the sealing thing which concerns on embodiment of this invention. It is an inner side view of the 2nd convex-shaped part of the sealing thing which concerns on embodiment of this invention. It is a top view of the 2nd convex part of the seal singing concerning an embodiment of the invention. It is a bottom view of the 2nd convex part of seal sealing concerning an embodiment of the invention. It is a front view of the 2nd convex-shaped part of the sealing thing which concerns on embodiment of this invention. It is an external appearance perspective view which shows the 1st convex part and 2nd convex part of the sealing thing which concerns on embodiment of this invention. It is a top view of the conventional sealing thing. It is a bottom view of the conventional sealing thing. It is an outer side view of the conventional sealing thing. It is an inner side view of the conventional sealing thing. It is AA sectional drawing of the conventional sealing thing. It is BB sectional drawing of the conventional sealing thing. It is an external appearance perspective view which shows the 1st convex part and 2nd convex part of the conventional sealing thing. It is an edge diagram when the cutting blade used in order to produce the seal ring which concerns on embodiment of this invention is seen along a cutting direction. It is an edge diagram when the cutting blade used in order to produce the seal ring which concerns on a modification (E) is seen along a cutting direction. It is an edge diagram when the cutting blade used in order to produce the conventional seal ring is seen along a cutting direction. It is a top view of a seal ring base. It is a bottom view of a seal ring base. It is sectional drawing of a seal ring base | substrate.

Explanation of symbols

1 Compressor 7 Annular member 23 Housing 23a Seal ring groove (groove)
23b Outer wall surface of seal ring groove (groove portion) 23d Inner wall surface of seal ring groove (groove portion) 23c Bottom surface of seal ring groove (groove portion) 26 Movable scroll 26a End plate 26b Wrap (spiral portion)
26c Bearing portion 70 Seal ring 71 Body portion 72 First convex portion 73 Joint portion 74 Second convex portion 80, 90 Cutting blade 81, 91 First blade line 82, 92 Second blade line 83, 93 Third blade line Pa2 first sliding surface (first sliding surface)
Pa4 Second slide surface (second slide surface)
Pb Lower annular plane (12th opposite surface)
Pc3 Stress distribution surface Pi Inner circumferential cylindrical surface (11th opposite surface)
Po Outer cylindrical surface (11th seal surface, 21st seal surface)
Po1 First outer peripheral side partial cylindrical surface (first seal surface)
Po2 Second outer peripheral cylindrical surface (third seal surface)
Po3 Third outer peripheral cylindrical surface (fifth seal surface)
Po4 4th outer peripheral side partial cylindrical surface (seventh seal surface)
Pu upper annular plane (12th seal surface, 22nd seal surface)
Pu1 First upper arcuate plane (second seal surface)
Pu2 second upper substantially rectangular plane (fourth seal surface)
Pu3 Third upper substantially rectangular plane (sixth seal surface)
Pu4 Fourth upper substantially rectangular plane (eighth seal surface)

Claims (7)

A movable scroll (26) having an end plate (26a) and a spiral portion (26b) extending from the first plate surface of the end plate in a direction perpendicular to the first plate surface while maintaining a spiral shape;
A housing (23) having an annular annular groove (23a);
A seal ring (70) received in the groove;
With
The seal ring has the first convex portion (72) as one end portion and the second convex portion (74) as the other end portion, and the first convex portion, the joint portion (73), and the main body portion. (71), and an annular column connected in the order of the second convex portion,
The main body includes a first sealing surface (Po1) that is a partially cylindrical surface facing the outer wall surface (23b) of the groove, and a second plate surface that is a surface on the back side of the first plate surface of the end plate. A second seal surface (Pu1) that is an arcuate plane facing
The first convex portion is a third seal surface (Po2) that is a partially cylindrical surface having the same central axis as the central axis (C1) of the first seal surface and the same radius as the first seal surface. And a center point (C2) of the arc-shaped side that is on the same plane as the second seal surface and that constitutes the second seal surface and that faces the outer wall surface of the groove, and a center point that is the same as the radius, and A fourth seal surface (Pu2) which is a surface having an arc-shaped side having the same radius, a side (L21) facing the bottom surface (23c) of the groove portion among the sides constituting the third seal surface, A first sliding surface (Pa2) that is a surface including a side (L22) facing the inner wall surface (23d) of the groove portion among the sides constituting the fourth seal surface;
The joint includes a fifth seal surface (Po3) which is a partially cylindrical surface having the same central axis as the central axis of the first seal surface and the same radius as the first seal surface, and a second seal surface. The sixth seal surface (Pu3), which is a surface including the arc-shaped side facing the outer wall surface of the groove portion among the sides constituting the second seal surface, and the joint of the main body portion Of the vertices constituting the end face on the part side, the apex (V31) located on the bottom surface side of the groove part and located on the inner wall surface side of the groove part, and the side constituting the end face on the joint part side of the first convex part A stress distribution surface (Pc3) that is a surface including a side (L23) corresponding to the first sliding surface;
The second convex portion is a partial cylindrical surface that has the same central axis as the central axis of the first seal surface and the same radius as the first seal surface and is continuous with the first seal surface. 7 of the seal surface (Po4) and the center point (C2) of the arc-shaped side (L41) that is on the same plane as the second seal surface and that faces the inner wall surface of the groove among the sides constituting the second seal surface ) And the eighth seal surface (Pu4) which is a surface having an arcuate side having the same center point and the same radius as the radius, and the second plate of the end plate among the sides constituting the seventh seal surface A surface that includes a side (L42) facing the surface and a side (L43) facing the outer wall surface of the groove among the sides constituting the eighth seal surface, the surface facing the first sliding surface. Having a second sliding surface (Pa4),
Compressor (1). The seal ring includes a first blade line (81, 91) that is a straight blade line when viewed along the cutting direction, and an end of the first blade line when viewed along the cutting direction. A second blade line (82, 92) extending in an angle direction of 0 ° to less than 180 ° with respect to the first blade line, and the other end of the first blade line when viewed along the cutting direction. A cutting blade (80, 90) having a third blade line (83, 93) extending in an angular direction greater than 180 ° and smaller than 270 ° with respect to the first blade line is moved in one direction to form a square cross section The annular member (7) is cut once,
The compressor according to claim 1. A part of the first sliding surface is in contact with a part of the second sliding surface during the orbiting motion of the movable scroll;
The compressor according to claim 1 or 2. The second convex portion has an end surface opposite to the main body portion side that is parallel to a surface orthogonal to the arc direction of the first seal surface.
The compressor according to any one of claims 1 to 3. Corners formed from the first seal surface and the second seal surface, corners formed from the third seal surface and the fourth seal surface, and the fifth seal surface and the sixth seal surface. The corner portion formed from the chamfer is chamfered larger than the maximum gap between the movable scroll and the housing generated during the turning motion of the movable scroll.
The compressor according to any one of claims 1 to 4. A movable scroll (26) having an end plate (26a) and a spiral portion (26b) extending from the first plate surface of the end plate in a direction perpendicular to the first plate surface while maintaining a spiral shape;
A housing (23) having an annular annular groove (23a);
A seal ring (70) received in the groove;
With
The seal ring has an eleventh seal surface (Po) that is a cylindrical surface facing the outer wall surface of the groove and a second plate surface that is a surface on the back side of the first plate surface of the end plate. A twelfth seal surface (Pu) that is an annular plane, an eleventh opposite surface (Pi) that is a cylindrical surface facing the inner wall surface of the groove, and an annular plane that faces the bottom surface of the groove. A first blade line (81, 91) that is a blade line that is a straight line when the annular member (7) having a twelfth opposite surface (Pb) having a square cross section is viewed along the cutting direction, and the cutting direction The second blade line (82, 92) extending from one end of the first blade line toward the angle direction of 0 ° or more and less than 180 ° with respect to the first blade line, and the cutting direction 180 ° from the other end of the first blade line with respect to the first blade line Cutting blades (80, 90) having a third blade line (83, 93) extending in a direction larger than 270 ° and the first blade line being the eleventh seal surface and the twelfth seal. The second blade line passes only through the side on the second plate surface side among the sides constituting the eleventh seal surface, the twelfth seal surface, and the eleventh seal surface, and passes through only the surface. Of the sides constituting the eleventh seal surface, the twelfth seal surface, the eleventh opposite surface, the twelfth opposite surface, the eleventh seal surface, the edge line (L4) on the bottom surface side of the groove portion, and It is generated by moving in one direction so as to pass only the sides (L2, L3) constituting the eleventh opposite surface and cutting once.
Compressor. A movable scroll (26) having an end plate (26a) and a spiral portion (26b) extending from the first plate surface of the end plate in a direction perpendicular to the first plate surface while maintaining a spiral shape;
An annular housing having a square cross-sectional groove;
A 21st seal surface (Po) which is a partial cylindrical surface facing the outer wall surface of the groove portion and an arc-shaped plane facing the second plate surface which is the back surface of the first plate surface of the end plate. A seal ring having a 22nd seal surface (Pu) which is a certain surface and received in the groove;
With
In the seal ring, a corner formed by the twenty-first seal surface and the twenty-second seal surface is chamfered to be larger than a maximum gap between the movable scroll and the housing generated during the orbiting movement of the movable scroll. Yes,
Compressor.

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