JP2008184978A - Vane rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit increase of contact stress, decrease drive power, and wear of a vane tip part. <P>SOLUTION: The width D2 of the tip part of the vane 2 in contact with a wall surface of a cylinder chamber 2 is formed wider than the width D1 of a base body part of the vane 2. Consequently, curvature R of the tip part of the vane 2 becomes larger as compared to a case in which the width of the tip part of the vane 2 is same as the width of the base body part. Since the contact area with an inner wall of a cylinder chamber 2 is expanded, friction resistance between the vane 2 and the cylinder chamber 2 is reduced. Consequently, drive power is reduced, the tip part of the vane 2 is controlled limited to materialize a long lifetime. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vane rotary compressor suitable for use in compression processing of refrigerant gas in a cooling device.

2. Description of the Related Art Conventionally, a vane rotary compressor formed by rotating a rotor including a vane that slides in a radial direction in a cylinder chamber having an elliptical inner wall shape is known. This vane rotary compressor has a compression chamber whose volume is increased or decreased by the sliding movement of the vane that rotates as the rotor rotates, and sucks refrigerant into the compression chamber through the suction port as the volume of the compression chamber increases. The refrigerant sucked in accordance with the decrease in the volume of the compression chamber is compressed and discharged from the discharge port.
Japanese Utility Model Publication No. 4-104193

  In the conventional vane rotary compressor, when the vane width is reduced in order to increase the refrigerant discharge capacity, the curvature R of the vane tip contacting the inner wall of the cylinder chamber decreases, and the contact stress (friction resistance) increases. . When the contact stress increases, the driving power increases, and the vane tip is easily worn away, so that the life of the vane is shortened.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a vane rotary compressor capable of suppressing wear of the vane tip.

  A vane rotary compressor according to the present invention includes a cylinder (3) defining a cylinder chamber (2) having an elliptical inner wall shape, a rotor (4) rotatably disposed in the cylinder chamber (3), and a rotor A vane rotary compressor comprising a vane (6) held by a rotor (4) so as to slide along a wall surface of a cylinder chamber (2) as the rotation of (4) is performed, on the wall surface of the cylinder chamber (2) The width (D2) of the tip of the vane (6) that is in contact is formed wider than the width (D1) of the base portion of the vane (6).

  According to the vane rotary compressor according to the present invention, the width (D2) of the tip of the vane (6) contacting the wall surface of the cylinder chamber (2) is wider than the width (D1) of the base portion of the vane (6). Therefore, abrasion of the tip of the vane (6) can be suppressed.

  Hereinafter, with reference to drawings, the composition of the vane rotary compressor used as the embodiment of the present invention is explained.

〔overall structure〕
As shown in FIG. 1, a vane rotary compressor 1 according to an embodiment of the present invention includes a cylinder 3 that defines a substantially elliptical inner wall-shaped cylinder chamber 2, and a columnar rotor 4 that is accommodated in the cylinder chamber 2. Have The rotating shaft 4a of the rotor 4 is disposed with its central axis aligned with that of the cylinder chamber 2, and is rotatably supported. The rotational force of the vehicle engine can be transmitted to the rotating shaft 4a through an electromagnetic clutch (not shown), and the rotor 4 is integrated with the rotating shaft 4a as the rotational force of the vehicle engine is transmitted. Driven in the direction.

  A plurality of vane grooves 5 are formed in the rotor 4. A vane 6 is accommodated in each vane groove 5 so as to be slidable and projectable in the circumferential direction of the rotor 4. Each vane 6 slides on the wall surface of the cylinder chamber 2 as the rotor 4 rotates. The cylinder chamber 2 is divided into a plurality of compression chambers 7 by being partitioned in the circumferential direction of the rotor 4 by vanes 6 held by the rotor 4. Each compression chamber 7 repeatedly increases and decreases in volume in the suction stroke and the compression stroke accompanying the rotation of the rotor 4.

  In the vicinity of the major axis of the cylinder chamber 2, a pair of suction ports 8 that supply the refrigerant to the compression chambers 7 are opened. In the vicinity of the minor axis of the cylinder chamber 2, a pair of discharge ports 9 for discharging the refrigerant compressed in each compression chamber 7 from the compression chamber 7 is opened. Each discharge port 9 is provided with a discharge valve 10 that prevents a reverse flow of the refrigerant discharged from the compression chamber 7.

  In the vane rotary compressor 1, when the rotational force of the vehicle engine is transmitted to the rotary shaft 4a via the electromagnetic clutch, the rotor 4 rotates integrally with the rotary shaft 4a. When the rotor 4 rotates, each vane 6 held by the rotor 4 slides in the cylinder chamber 2. A suction force acts on the compression chamber 7 whose volume is increased by the sliding of the vane 6. When a suction force acts on the compression chamber 7, the refrigerant from the evaporator is sucked into each compression chamber 7 through the suction port 8 in the suction stroke. When the compression chamber 7 in the suction stroke shifts to the compression stroke in which the volume is reduced as the rotor 4 continues to rotate, the refrigerant in the compression chamber 7 is compressed. When the refrigerant pressure in the compression chamber 7 during the compression stroke becomes equal to or higher than a predetermined value, the compressed refrigerant is discharged from the compression chamber 7 through the discharge port 10.

[Vane shape]
In the vane rotary compressor 1 according to the embodiment of the present invention, as shown in FIG. 2, the width D2 of the tip of the vane 2 that contacts the wall surface of the cylinder chamber 2 is formed wider than the width D1 of the base portion of the vane 2. Has been. According to such a configuration, the curvature R of the tip end portion of the vane 2 is increased compared to the case where the width of the tip end portion of the vane 2 is the same as the width of the base portion, and the inner wall surface of the cylinder chamber 2 Since the contact area increases, the frictional resistance between the vane 2 and the cylinder chamber 2 is reduced. Therefore, according to the vane rotary compressor 1 which becomes embodiment of this invention, while being able to reduce drive power, the front-end | tip part of the vane 2 can be suppressed and long life can be implement | achieved.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

It is sectional drawing which shows the structure of the vane rotary compressor used as embodiment of this invention. It is a schematic diagram which shows the shape of the front-end | tip part of the vane shown in FIG.

Explanation of symbols

1: vane rotary compressor 2: cylinder chamber 3: cylinder 4: rotor 4a: rotating shaft 5: vane groove 6: vane 7: compression chamber 8: suction port 9: discharge port 10: discharge valve

Claims (1)

  A cylinder (3) defining a cylinder chamber (2) having an elliptical inner wall shape, a rotor (4) rotatably disposed in the cylinder chamber (3), and a cylinder chamber as the rotor (4) rotates A vane rotary compressor comprising a vane (6) held by a rotor (4) so as to slide on a wall surface of (2), the vane (6) contacting the wall surface of the cylinder chamber (2) A vane rotary compressor characterized in that the width (D2) of the tip is formed wider than the width (D1) of the base portion of the vane (6).

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