JP2018009544A - Scroll Type Fluid Machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine which can extend a chip seal of a scroll to an outer peripheral edge portion direction of a vortex body, to improve performance, without deteriorating productivity.SOLUTION: A moving vortex body 52 of a moving scroll 10 slides with a substrate of a fixed scroll through a moving chip seal 56 provided on a tip end surface, thereby dividing a compression chamber 58. The moving chip seal 56 is composed of a main portion 56c extended from a center end portion 52b of the moving vortex body toward an outer peripheral end portion 52c and having fixed width W1; and a narrow width portion 56d continuing from a terminal portion Q of the main portion in an outer peripheral end portion 52c direction, and having fixed width W2 narrower than the main portion.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a scroll type fluid machine that partitions a pressure chamber between spiral bodies of a pair of scrolls.

  Conventionally, this type of scroll type fluid machine has been used as a compressor constituting an air conditioner of a vehicle, for example. Such a scroll type fluid machine is configured so that a fixed scroll and a movable scroll each having a spiral body projecting from a disk-shaped substrate are meshed with each other, and the movable scroll is swung with respect to the fixed scroll. The volume of the pressure chamber of the working fluid formed between the bodies was decreased toward the center side, and the working fluid was compressed.

  In this case, the scroll body of each scroll basically has a spiral shape along the involute curve, but the outer wall surface of the spiral body does not protrude from the substrate at the outer peripheral edge. Since the curved surface has an arcuate shape, the wall is thinner than other portions (see, for example, Patent Document 1).

  Further, in this type of scroll type fluid machine, a tip seal is provided on the end face of the scroll of each scroll. This chip seal is fitted into a seal groove that has been cut into the distal end surface of the spiral body (see, for example, Patent Document 2). The tip seal provided in this way maintains the airtightness of the pressure chamber by sliding contact with the opposing substrate, and further, a lubrication function that prevents the inconvenience that the metal scrolls come into contact with each other and wear. Also have.

JP-A-2-27183 JP 2001-221176 A

  Ideally, such a tip seal is provided over the entire region from the central end to the outer peripheral end of the spiral body. However, as shown in Patent Document 1, the spiral body is thin at the outer peripheral end. Since it becomes a wall, it is not easy to cut the seal groove into which the tip seal is fitted on the front end surface. Therefore, if the diameter of the substrate is increased in order to increase the thickness of the outer peripheral end portion of the spiral body, the dimensions of the entire fluid machine will be increased.

  For this reason, the tip seal is normally finished near the outer periphery reaching portion where the outer wall surface of the spiral body reaches the outer peripheral edge of the substrate, and no sealing is performed between the opposing scroll substrate on the outer peripheral end side from there. The working fluid leaked (referred to as blow-by), which deteriorated the performance of the scroll type fluid machine.

  The present invention has been made to solve the conventional technical problems, and extends the tip seal of the scroll in the direction of the outer peripheral end of the spiral body without causing deterioration in productivity, thereby improving the performance. It is an object of the present invention to provide a scroll type fluid machine capable of achieving the above.

  In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention includes a pair of scrolls each having a substrate and a spiral body standing on one surface of the substrate, and the scroll body of one scroll is a tip surface thereof. The pressure chamber formed between the spiral bodies is partitioned by sliding contact with the substrate of the other scroll through the tip seal provided on the tip seal, and the tip seal provided on at least one scroll is The scroll spiral body extends from the central end portion toward the outer peripheral end portion, and has a main portion having a certain width, and continues from the end point portion of the main portion toward the outer peripheral end portion of the spiral body, It is comprised from the narrow part which has a fixed width | variety narrower than a part, It is characterized by the above-mentioned.

  The scroll type fluid machine according to the invention of claim 2 is characterized in that, in the above invention, the main part extends from the central end of the spiral body to the vicinity of the outer periphery where the outer wall surface of the spiral body reaches the outer peripheral edge of the substrate, The narrow width portion is characterized in that it extends continuously from the end point of the main portion toward the outer peripheral end of the spiral body.

  According to a third aspect of the present invention, the distance between the tip seal and the inner wall surface of the spiral body is constant from the main part to the narrow part.

  According to a fourth aspect of the present invention, the distance between the end point of the narrow portion and the outer wall surface of the spiral body is the distance between the end point of the main portion and the outer wall surface of the spiral body. It is equivalent to.

  According to the present invention, each includes a pair of scrolls each having a substrate and a spiral body standing on one surface of the substrate, and the spiral body of one scroll is connected to the other through a tip seal provided on the tip surface thereof. In a scroll type fluid machine that slidably contacts a scroll substrate to partition a pressure chamber formed between the spiral bodies, a chip extending from the central end portion of the spiral body of at least one scroll toward the outer peripheral end portion Since the seal is composed of a main part having a constant width and a narrow part having a constant width that is continuous from the end point of the main part toward the outer peripheral end of the spiral body and narrower than the main part. The main part as in the invention of claim 2 is extended from the central end of the spiral body to the vicinity of the outer periphery where the outer wall surface of the spiral body reaches the outer peripheral edge of the substrate, and the narrow part is the end point of the main part Outside the spiral body continuously from the section By extending in the end direction, the tip seal can be extended to the tip of the outer peripheral end of the scroll, which is a thin wall, so that airtightness can be improved and performance can be improved compared to the conventional one. At the same time, the diameter of the scroll substrate can be reduced, so that the scroll type fluid machine can be made compact.

  In this case, since the narrow part continuing from the main part has a certain width, it is possible to form the narrow part by a single cutting process by using an end mill having a diameter of this width. Thus, it is possible to suppress a decrease in productivity.

  Further, if the distance between the tip seal and the inner wall surface of the spiral body is constant from the main part to the narrow width part as in the invention of claim 3, the narrow wall part becomes the inner wall surface of the spiral body. It is possible to improve the airtightness by moving to the side, and if cutting by the end mill is started from the end point of the narrow part, it is carried out to the center end along the involute curve of the spiral body, and again By returning to the vicinity of the outer periphery reaching portion, the narrow width portion and the main portion can be formed, and the productivity is further improved.

  Furthermore, the distance between the end point of the narrow portion and the outer wall surface of the spiral body is made equal to the distance between the end point of the main portion and the outer wall surface of the spiral body as in the invention of claim 4. In addition, the strength of the tip surface of the spiral body at the end point of the narrow width portion can be ensured without hindrance.

1 is a schematic configuration diagram of a scroll compressor as an embodiment of a scroll fluid machine to which the present invention is applied. It is a top view of the movable scroll of the scroll compressor of FIG. It is the sectional view on the AA line of FIG. It is a figure which expands and demonstrates the outer peripheral edge part of the movable spiral body of the movable scroll of FIG. It is a figure explaining an example of the cutting process for forming the seal groove for the chip seal of the movable scroll of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a scroll compressor 1 as an embodiment of the scroll fluid machine of the present invention. The scroll compressor 1 according to the embodiment is incorporated in a refrigeration circuit for air-conditioning a vehicle, and is used for compressing a refrigerant (working fluid) circulating in the refrigeration circuit.

  The scroll compressor 1 includes a rear housing 2 and a front housing 4, and a scroll unit 6 is accommodated in the rear housing 2. The scroll unit 6 includes a pair of scrolls including a fixed scroll 8 fixed to the rear housing 2 and a movable scroll 10 assembled so as to mesh with the fixed scroll 8. Thus, the scroll unit 6 continuously executes a series of processes from the suction of the refrigerant to the discharge through the compression.

  More specifically, a discharge chamber 12 is formed in the rear housing 2 between the end plate 2 a and the fixed scroll 8 (other surface) of the scroll unit 6, and the discharge chamber 12 is a fixed substrate 8 a of the fixed scroll 8. It is possible to communicate with the discharge hole 14 formed in the first through a reed valve type discharge valve 16. The discharge chamber 12 communicates with the refrigerant circulation path of the refrigeration circuit via a discharge port (not shown) formed in the rear housing 2.

  The rear housing 2 is also provided with a refrigerant suction port (not shown). The suction port introduces the refrigerant into the rear housing 2 from the refrigerant circulation path, and the introduced refrigerant enters the scroll unit 6. Inhaled.

  On the other hand, a drive shaft 18 is disposed in the front housing 4. The drive shaft 18 has a large-diameter shaft portion 20 and a small-diameter shaft portion 22, and the large-diameter shaft portion 20 is rotatably supported by the front housing 4 via a needle bearing 24. The front housing 4 is rotatably supported via a bearing 26. Further, a lip seal 28 is disposed between the small diameter shaft portion 22 and the front housing 4, and the lip seal 28 partitions the front housing 4 in an airtight manner.

  A small-diameter shaft portion 22 of the drive shaft 18 protrudes from the front housing 4, and the protruding end is connected to a drive pulley 30 incorporating an electromagnetic clutch. The drive pulley 30 is rotatably supported by the front housing 4 via a bearing 32. ing. The driving pulley 30 is connected to an output pulley on the engine side of the vehicle via a belt, and is rotated by receiving power from the engine. Therefore, during driving of the engine, if the electromagnetic clutch in the drive pulley 30 is on, the drive shaft 18 rotates with the drive pulley 30.

  On the other hand, a crank pin 34 protrudes from the large-diameter shaft portion 20 of the drive shaft 18 toward the movable scroll 10, and the crank pin 34 supports the boss 40 of the movable scroll 10 via an eccentric bush 36 and a needle bearing 38. Yes. As a result, when the drive shaft 18 is rotated, the movable scroll 10 orbits through the crank pin 34 and the eccentric bush 36.

  Further, a rotation prevention coupling is disposed between the front housing 4 and the movable substrate 10 a of the movable scroll 10. In this embodiment, the rotation prevention coupling comprises a so-called EM coupling 42, and the EM coupling 42 is configured by sandwiching a ball 48 between the annular race grooves of both the movable plate 44 and the fixed plate 46 each having a ring shape. ing.

  The fixed scroll 8 includes a fixed substrate 8a and a fixed spiral body 50 that is integrally provided on one surface of the fixed substrate 8a. The movable scroll 10 is also integrally formed on the movable substrate 10a and one surface of the movable substrate 10a. A movable spiral body 52 is provided upright. Most of the inner and outer surfaces of the fixed and movable spiral bodies 50 and 52 are composed of involute curves, and are formed of, for example, an aluminum alloy.

  The discharge hole 14 described above is positioned in the vicinity of the central end 50b of the fixed spiral body 50, and a certain clearance is secured between the inner surface of the central end 50b.

  A fixed tip seal 54 is provided on the distal end surface 50 a of the fixed spiral body 50, and a movable tip seal 56 is provided on the distal end surface 52 a of the movable spiral body 52. The fixed and movable tip seals 54 and 56 have an elastic modulus of about 1/30 or less of the fixed and movable spiral bodies 50 and 52 made of the above-described aluminum alloy, for example, engineering plastic such as polyphenylene sulfide (PPS). Molded from.

  The fixed spiral body 50 and the movable substrate 10 a are slidably contacted with each other via a fixed chip seal 54, while the movable spiral body 52 and the fixed substrate 8 a are slidably contacted with each other via a movable chip seal 56. Due to the sliding contact between the fixed and movable scrolls 8 and 10, a compression chamber 58 as a pressure chamber for compressing the refrigerant is defined between the fixed and movable spiral bodies 50 and 52. A series of processes is performed continuously.

  Here, the movable tip seal 56 will be described in detail. 2 is a plan view of the movable scroll 10, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is an enlarged view of the outer peripheral end portion of the movable spiral body 52 of the movable scroll 10. . The following will be described with reference to these drawings.

  As shown in FIG. 3, the movable tip seal 56 is fitted in a seal groove 60 formed in the distal end surface 52 a of the movable spiral body 52. The fixed tip seal 54 is fitted in a seal groove 55 formed on the distal end surface 50 a of the fixed spiral body 50.

  As shown in FIG. 4, the movable tip seal 56 extends from the central end 52b of the movable spiral body 52 toward the outer peripheral end 52c and to the vicinity of the outer peripheral end 52c. At this time, the movable spiral body 52 has a shape extending from the central end portion 52b to the outer peripheral side along the involute curve until the outer wall surface reaches the outer peripheral edge of the movable substrate 10a. From the point P where the outer wall surface of the movable spiral body 52 reaches the outer periphery of the movable substrate 10a (hereinafter referred to as the outer periphery reaching portion P) to the outer peripheral end 52c, the outer wall surface extends along the outer periphery of the movable substrate 10a. The inner wall surface is a thin wall portion 52d extending along the involute curve.

  On the other hand, the movable tip seal 56 is constant at the center position in the width direction of the front end surface 52a along the involute curve from the central end 56a located at the central end portion 52b of the movable spiral body 52 to the vicinity of the outer periphery reaching portion P. The width W1 extends, and this portion becomes the main portion 56c. The end portion (indicated by Q in FIG. 4) of the main portion 56c to the outer peripheral end 56b is narrower than the width W1 of the main portion 56c as shown in FIG. 4 along the involute curve (Example) In this case, it is continuously halfway from the end point portion Q in the direction of the outer peripheral end portion 52c, and this portion becomes the narrow width portion 56d.

  At this time, the distance D1 between the inner surface of the movable tip seal 56 and the inner wall surface of the movable spiral body 52 is constant from the main portion 56c to the narrow width portion 56d. The distance D2 between the end point of the narrow portion 56d, that is, the distance between the outer peripheral end 56b and the outer wall surface of the movable spiral body 52 is between the end point Q of the main portion 56c and the outer wall surface of the movable spiral body 52. It is equivalent to the distance D3. These distances D2 and D3 are set to a value equal to or greater than the limit value of the thickness dimension of the movable spiral body 52 between the movable tip seal 56 and the outer wall surface of the movable spiral body 52.

  Next, the cutting process of the seal groove 60 in which the movable tip seal 56 is fitted will be described with reference to FIG. In FIG. 5, the end mill 62 that forms the seal groove 60 is indicated by a dotted line. As shown in the figure, the diameter of the end mill 62 matches the width W 2 of the narrow width portion 56 d of the movable tip seal 56. The width W1 of the main portion 56c is approximately twice the diameter of the end mill 62.

  In order to form the seal grooves 60 along the widths W1 and W2 of the main portion 56c and the narrow width portion 56d of the movable tip seal 56, first, as shown in FIG. Then, the cutting by the end mill 62 is started from the outer peripheral end (indicated by 60a in FIG. 5) of the seal groove 60 corresponding to the outer peripheral end 56b of the movable tip seal 56 (end point portion of the narrow width portion 56d). A certain distance D1 is present between the wall surface and the wall surface, and is moved along the involute curve to a position corresponding to the center end 56a of the movable tip seal 56 positioned at the center end 52b of the movable spiral body 52. Thereby, the inner peripheral side of the seal groove 60 is formed. Incidentally, in the vicinity of the central end portion 52b, it is somewhat separated from the inner wall surface of the movable spiral body 52 (FIG. 4).

  When the end mill 62 reaches a position corresponding to the center end 56 a located at the center end portion 52 b of the movable spiral body 52, the end mill 62 is folded back to form the outer peripheral surface of the seal groove 60. That is, this time, the end mill 62 is moved from the inner peripheral end portion 52b of the movable spiral body 52 to the position corresponding to the end point portion Q (also shown in FIG. 5) of the main portion 56c of the movable tip seal 56. A certain distance D3 exists between the wall surface and the wall is moved along the involute curve. As described above, the end mill 62 is reciprocated once at the tip end surface 52 a of the movable spiral body 52, thereby forming a series of seal grooves 60 for fitting the main portion 56 c and the narrow width portion 56 d of the movable tip seal 56. be able to. In particular, in this case, the narrow width portion 56d is formed by moving the end mill 62 only once from the position corresponding to the outer peripheral end 56b to the position corresponding to the end point portion Q without reciprocating the end mill 62. The cutting work efficiency by 62 is very good.

  As described above, in the embodiment, the movable tip seal 56 extending from the central end portion 52b of the movable spiral body 52 of the movable scroll 10 toward the outer peripheral end portion 52c, the main portion 56c having a certain width W1, and this The end portion Q of the main portion 56c continues from the end portion 52c of the movable spiral body 52 in the direction of the outer peripheral end portion 52c, and has a narrow width portion 56d having a constant width W2 narrower than the main portion 56c. 56c is extended from the central end 52b of the movable spiral body 52 of the movable scroll 10 to the vicinity of the outer periphery reaching portion P where the outer wall surface of the movable spiral body 52 reaches the outer peripheral edge of the substrate 10a. Since it extends in the direction of the outer peripheral end 52c of the movable spiral body 52 of the movable scroll 10 continuously from the end point Q of the main portion 56c, the movable scroll 10 can be moved to the front end surface of the outer peripheral end 52c of the movable scroll 10 which is a thin wall. Chip Since the tool 56 is extended, the airtightness is improved as compared with the conventional case, the performance can be improved, and the diameter of the movable substrate 10a of the movable scroll 10 can be reduced. The scroll compressor 1 can also be made compact.

  In this case, since the narrow width portion 56d continuous from the main portion 56c has a constant width W2, by using the end mill 62 having a diameter of the width W2, the narrow width portion 56d is formed by a single cutting process. It becomes possible to form, and it becomes possible to suppress the fall of productivity.

  Further, the distance D1 between the movable tip seal 56 provided on the movable scroll 10 and the inner wall surface of the movable spiral body 52 of the movable scroll 10 is made constant from the main part 56c to the narrow part 56d. Therefore, the narrow width portion 56d approaches the inner wall surface side of the movable spiral body 52, and the airtightness can be improved. Then, as described above, the cutting by the end mill 62 is started from the outer peripheral end 56b of the movable tip seal 56 which is the end point portion of the narrow width portion 56d, and is performed to the central end portion 52b along the involute curve of the movable spiral body 52. By returning to the vicinity of the outer periphery reaching portion P again, the narrow width portion 56d and the main portion 56c can be formed, and the productivity is further improved.

  Further, the distance D2 between the outer peripheral end 56b, which is the end point of the narrow width portion 56d, and the outer wall surface of the movable spiral body 52 of the movable scroll 10 is set to the end point Q of the main portion 56c and the movable spiral body 52 of the movable scroll 10. By setting the distance D3 to be equal to the distance D3 from the outer wall surface, the strength of the distal end surface of the movable spiral body 52 at the end point portion (outer peripheral end 56b) of the narrow width portion 56d can be ensured without any trouble.

  In the above embodiment, the present invention is applied to the movable tip seal 56 provided on the movable scroll 10. However, the present invention is not limited to this, and in addition to or instead of the movable scroll 10, the fixed tip seal 54 of the fixed scroll 8. The present invention may be applied to. Thereby, the diameter of the fixed substrate 8a of the fixed scroll 8 can be reduced, and the scroll compressor 1 can be made compact.

  On the other hand, if the present invention is applied to the movable tip seal 56 of the movable scroll 10 as in the embodiment, the diameter of the movable substrate 10a can be reduced. As a result, the orbiting diameter of the orbiting scroll 10 can be kept small, and the scroll compressor 1 can be made more effective in size.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the scroll type fluid machine is not limited to the scroll type compressor of the embodiment, and the present invention is also effective for an expander.

  In the embodiment, the cutting of the seal groove 60 by the end mill 62 is started from the position corresponding to the outer peripheral end 56b. However, the present invention is not limited to this, and the processing is started from the end point Q of the main portion 56c. It moves to the inner peripheral end 52b with a constant distance D3 between it and the outer wall surface, and then turns back and this time with a constant distance D1 between the inner wall surface of the movable spiral body 52 and the outer peripheral end 56b. You may make it move to the position corresponding to. Accordingly, a series of seal grooves 60 for fitting the main portion 56c and the narrow width portion 56d of the movable tip seal 56 are formed only by reciprocating the end mill 62 once at the front end surface 52a of the movable spiral body 52. be able to.

1 Scroll type compressor (Scroll type fluid machine)
6 Scroll unit 8 Fixed scroll (scroll)
8a Fixed board 10 Movable scroll (scroll)
DESCRIPTION OF SYMBOLS 10a Movable board 50 Fixed spiral body 50a, 52a Front end surface 52 Movable spiral body 54 Fixed tip seal 56 Movable tip seal 56a Central end 56b Outer peripheral end 56c Main part 56d Narrow part 58 Compression chamber (pressure chamber)
60 Sealing groove 62 End mill P Outer peripheral part Q End point

Claims (4)

Each of the scrolls includes a pair of scrolls each having a substrate and a spiral body standing on one surface of the substrate, and the scroll body of one of the scrolls is attached to the other scroll substrate via a tip seal provided on a tip surface thereof. In the scroll type fluid machine that divides the pressure chamber formed between the spiral bodies by sliding contact,
The tip seal provided on at least one of the scrolls extends from the center end of the scroll spiral body toward the outer peripheral end, and has a main portion having a certain width and an end point portion of the main portion. A scroll-type fluid machine comprising: a narrow-width portion that is continuous in a direction toward the outer peripheral end of the spiral body and has a constant width that is narrower than the main portion. The main part extends from the central end of the spiral body to the vicinity of the outer periphery where the outer wall surface of the spiral body reaches the outer peripheral edge of the substrate,
2. The scroll fluid machine according to claim 1, wherein the narrow portion extends continuously from an end point of the main portion toward an outer peripheral end of the spiral body.   The scroll type fluid machine according to claim 2, wherein a distance between the tip seal and the inner wall surface of the spiral body is constant from the main part to the narrow part.   The distance between the end point of the narrow portion and the outer wall surface of the spiral body is equal to the distance between the end point portion of the main portion and the outer wall surface of the spiral body. 4. A scroll type fluid machine according to 3.

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