JP2008150981A - Vane rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve volume efficiency of a vane rotary compressor. <P>SOLUTION: An inner wall shape at an intake port 10 side of a cylinder chamber 5 is extended to an outward (intake port 10 side) direction rather than an elliptical curve. The inner wall shape of the cylinder chamber 5 is formed by an arc range (angle zones θ1, θ5, θ6, and θ10) defined by an arc of a radius r1, an elliptical curve range (angle zones θ2 and θ7) defined by a first sine curve, an arc range (angle zones θ3 and θ8) defined by an arc of a radius r2 (greater than r1), and an elliptical curve range (angle zones θ4 and θ9) defined by a second sine curve as illustrated in Fig. 2. The curvature radius of the arc range (angle zones θ3 and θ8) is the same as the curvature radius of the elliptical curve range (angle zones θ4 and θ9), or is larger than the curvature radius of the elliptical curve range (angle zones θ4 and θ9). <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 (see Patent Document 1). This vane rotary compressor has a compression chamber whose volume increases and decreases due to the sliding motion 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. (Suction stroke), the refrigerant sucked in accordance with the decrease in the volume of the compression chamber is compressed and discharged from the discharge port (compression stroke).
Japanese Patent No. 2673431

  In the conventional vane rotary compressor, since the cylinder chamber is symmetrical and the entire circumference except for the vicinity of the minor axis is an elliptical shape defined by a single sinusoidal curve, the refrigerant suction area into the cylinder chamber Cannot be secured. For this reason, according to the conventional vane rotary compressor, it has been difficult to improve volumetric efficiency and cooling efficiency by increasing the amount of refrigerant that can be sucked.

  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 improving volumetric efficiency and cooling efficiency.

  The vane rotary compressor according to the present invention includes a cylinder (4) defining a cylinder chamber (5) having an elliptical inner wall shape, a rotor (6) rotatably disposed in the cylinder chamber (5), and a rotor A vane (8) held by the rotor (6) so as to slide along the wall surface of the cylinder chamber (5) as the rotation of (6), and an inlet (10) for supplying refrigerant into the cylinder chamber (5); The vane rotary compressor includes a discharge port (11) that discharges a refrigerant compressed as the vane (8) slides, and an inner wall shape of the cylinder chamber (5) on the suction port (10) side is an ellipse. An arc region having a major axis extending in the direction of the suction port (10) from the major axis, and an ellipse region connecting the end points of the arc region and the minor axis of the ellipse by an elliptic curve.

  According to the vane rotary compressor according to the present invention, the suction area can be increased without greatly changing the discharge capacity, so that the volume efficiency can be improved.

  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 cylindrical housing 2 and a concentric vane rotary type compression mechanism 3 accommodated in the housing 2. The compression mechanism 3 includes a cylinder 4 that defines a cylinder chamber 5 having a substantially elliptic inner wall shape, and a columnar rotor 6 that is accommodated in the cylinder chamber 5. The rotation shaft 6a of the rotor 6 is disposed with its center axis aligned with that of the cylinder chamber 5, and is rotatably supported. The rotational force of the vehicle engine can be transmitted to the rotating shaft 6a via an electromagnetic clutch (not shown), and the rotor 6 is integrated with the rotating shaft 6a as the rotational force of the vehicle engine is transmitted. Driven in the direction.

  A plurality of vane grooves 7 are formed in the rotor 6. A vane 8 is accommodated in each vane groove 7 so as to be slidable and projectable in the circumferential direction of the rotor 6. Each vane 8 slides on the wall surface of the cylinder chamber 5 as the rotor 6 rotates. The cylinder chamber 5 is divided into a plurality of compression chambers 9 by being partitioned in the circumferential direction of the rotor 6 by the vanes 8 held by the rotor 6. Each compression chamber 9 repeatedly increases and decreases in volume in the suction stroke and the compression stroke accompanying the rotation of the rotor 6. In the vicinity of the major axis of the cylinder chamber 5, a pair of suction ports 10 that supply refrigerant to the compression chambers 9 are opened. In the vicinity of the short axis of the cylinder chamber 5, a pair of discharge ports 11 for discharging the refrigerant compressed in each compression chamber 9 from the compression chamber 9 is opened. Each discharge port 11 is provided with a discharge valve 13 for preventing the reverse flow of the refrigerant discharged from the compression chamber 9 and a valve support 14 for preventing excessive deformation of the discharge valve 13.

  In the vane rotary compressor 1, when the rotational force of the vehicle engine is transmitted to the rotary shaft 6a via the electromagnetic clutch, the rotor 6 rotates integrally with the rotary shaft 6a. When the rotor 6 rotates, each vane 8 held by the rotor 6 slides in the cylinder chamber 5. A suction force acts on the compression chamber 9 whose volume is increased by the sliding of the vane 8. When a suction force acts on the compression chamber 9, the refrigerant from the evaporator is sucked into each compression chamber 9 through the suction port 10 in the suction stroke. When the compression chamber 9 in the suction stroke shifts to a compression stroke in which the volume of the compression chamber 9 is reduced as the rotor 6 continues to rotate, the refrigerant in the compression chamber 9 is compressed. When the refrigerant pressure in the compression chamber 9 during the compression stroke becomes equal to or higher than a predetermined value, the compressed refrigerant is discharged from the compression chamber 9 through the discharge port 11.

[Cylinder chamber shape]
In the vane rotary compressor 1 according to the embodiment of the present invention, the shape of the inner wall of the cylinder chamber 5 on the suction port 10 side is wider than the elliptic curve in the direction of the outer side (suction port 10 side). Specifically, as shown in FIG. 2, the inner wall shape of the cylinder chamber 5 is expressed by an arc region (angle regions θ1, θ5, θ6, θ10) defined by an arc having a radius r1 and a first sine wave curve. An elliptic curve region (angle regions θ2, θ7) defined, an arc region (angle regions θ3, θ8) defined by an arc of radius r2 (> r1), and an elliptic curve defined by a second sine wave curve The region (angle regions θ4, θ9) is formed. The radius of curvature of the arc region (angle regions θ3, θ8) is the same as the radius of curvature of the elliptic curve region (angle regions θ4, θ9) or larger than the radius of curvature of the elliptic curve region (angle regions θ4, θ9). ing. According to such a shape of the cylinder chamber 5, since the suction areas R1 and R2 can be increased as compared with the conventional elliptical cylinder chamber (the broken line shape shown in FIGS. 1 and 2), the discharge capacity is almost reduced. The amount of refrigerant that can be sucked in without being changed can be increased, and the volumetric efficiency and cooling efficiency can be improved.

  As mentioned above, although the embodiment to which the invention made by the present inventors was 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 for demonstrating the inner wall shape of the cylinder chamber shown in FIG.

Explanation of symbols

1: vane rotary compressor 2: housing 3: compression mechanism 4: cylinder 5: cylinder chamber 6: rotor 6a: rotating shaft 7: vane groove 8: vane 9: compression chamber 10: suction port 11: discharge port 13: discharge valve 14: Valve support

Claims (2)

  A cylinder (4) defining a cylinder chamber (5) having an elliptical inner wall shape, a rotor (6) rotatably disposed in the cylinder chamber (5), and a cylinder chamber as the rotor (6) rotates For sliding the vane (8) held by the rotor (6) so as to slide on the wall surface of (5), the suction port (10) for supplying the refrigerant into the cylinder chamber (5), and the vane (8). A vane rotary compressor including a discharge port (11) that discharges a compressed refrigerant, and the inner wall shape of the cylinder chamber (5) on the side of the suction port (10) is a suction port extending from the major axis of the ellipse. (10) A vane rotary compressor having an arc region having a major axis extending in the direction as a radius, and an ellipse region connecting an end point of the arc region and a short axis part of the ellipse by an elliptic curve.   2. The vane rotary compressor according to claim 1, wherein a radius of curvature of the arc region is equal to or larger than a radius of curvature of the elliptical region.

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