JP2009250063A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor in which a coil spring and a guide pin are arranged up to the innermost depth of a rotor. <P>SOLUTION: This compressor 1 is provided so that a cylinder chamber 14 is arranged in a cylinder block 11; the rotor 15 is rotatably arranged in the cylinder chamber 14; a plurality of vane grooves 17 opening on its outer peripheral surface are arranged in the rotor 15; a vane 18 is movably arranged in the projecting or retreating direction in the respective vane grooves 17; and a coil spring 19 energizing the vane 18 in the projecting direction and the guide pin 30 for guiding the coil spring 19, are arranged on the bottom surface side of the respective vanes 18. The coil spring 19 and the guide pin 30 of the adjacent vanes 18 are respectively arranged in a position shifted in the rotary shaft direction of the rotor 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a compressor that compresses refrigerant by forming a compression chamber in a cylinder chamber by a vane that rotates with the rotor in the cylinder chamber.

  A conventional compressor of this type is disclosed in Patent Document 1. This compressor has a vane type compression mechanism. In the compression mechanism section, a cylinder chamber is provided in the block, and a rotor is rotatably disposed in the cylinder chamber. The rotor is provided with a plurality of vane grooves that are opened on the outer peripheral surface thereof, and vanes are arranged in the respective vane grooves so as to be movable in the protruding and retracting directions. A high-pressure supply passage is opened in the vane groove on the bottom side of each vane.

  In this conventional example, chattering of the vanes is prevented by applying hydraulic pressure to the vanes. However, the vane may chatter in an operating situation where the hydraulic pressure is not increased beyond a predetermined level, such as when compression starts.

  Another conventional example is disclosed in Patent Document 2. Another conventional example is a vane pump that pressurizes oil, and a guide pin fixed to a rotor projects from the vane groove, and a coil spring is disposed on the outer periphery of the guide pin.

  In this other conventional example, since the spring force of the coil spring acts on the vane, it is possible to prevent chattering of the vane regardless of the hydraulic pressure increase state, and the coil spring expands and contracts while being guided by the guide pin. Prevents biting during spring buckling.

By the way, the compression rate can be improved by increasing the stroke of the vane in the protruding / retracting direction. Further, by increasing the length of the coil spring, it is possible to prolong the life of the spring.
JP 2007-1000060 A No. 8-538

  However, when the stroke of the vane is increased or the length of the coil spring is increased, it is necessary to dispose the coil spring and the guide pin deep into the rotor. In the other conventional examples described above, the coil spring and the guide pin are not arranged deep in the rotor. Normally, coil springs and guide pins of adjacent vanes are arranged at the same position with respect to the rotation axis direction of the rotor. In such an arrangement, when the coil spring and the guide pin of the adjacent vane are arranged deep in the rotor, the arrangement positions of both overlap, so that there is a problem that the coil spring and the guide pin cannot be arranged deep in the rotor. .

  Then, an object of this invention is to provide the compressor which can arrange | position a coil spring and a guide pin to the deep part of a rotor.

  The invention of claim 1 that achieves the above object is characterized in that a cylinder chamber is provided in the block, a rotor is rotatably provided in the cylinder chamber, and a plurality of vane grooves that are open to the outer peripheral surface of the rotor are provided. A vane is disposed in each vane groove so as to be movable in the projecting and retracting directions, and a coil spring for biasing the vane in the projecting direction and a guide pin for guiding the coil spring are provided on the bottom surface side of each vane. In the compressor, the coil springs and the guide pins of the adjacent vanes are respectively arranged at positions shifted in the rotation axis direction of the rotor.

  A second aspect of the present invention is the compressor according to the first aspect, wherein a plurality of the coil springs and the guide pins are arranged for each of the vanes.

  A third aspect of the present invention is the compressor according to the second aspect, wherein the plurality of coil springs and the guide pins are arranged at symmetrical positions of the vane.

  A fourth aspect of the present invention is the compressor according to any one of the first to third aspects, wherein the guide pin is fixed to the rotor, and the vane corresponds to all arrangement positions of the guide pin. A pin relief hole is provided at a position where the pin escapes.

  According to the first aspect of the present invention, even if the coil springs and the guide pins of the adjacent vanes are arranged deep inside the rotor, the arrangement positions of the two do not overlap with each other. It can be placed in a deep position. As a result, the stroke of the vane can be increased to improve the compression rate, and the length of the coil spring and the guide pin can be increased to extend the repeated life of the coil spring.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the spring force per coil spring can be reduced, the life of the repeated life can be increased.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the spring force acts on the vane with a good balance, the vane moves smoothly.

  According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, the same vane can be arranged in any vane groove regardless of the standing position of the guide pin. Is easy to assemble.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 7 show a first embodiment of the present invention, FIG. 1 is a sectional view of a compressor, FIG. 2 is a sectional view of a compression mechanism, FIG. 3 is a sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along line BB in FIG. 4, FIG. 6 is a cross-sectional view taken along line CC in FIG. 4, and FIG. 7 is a cross-sectional view taken along line DD in FIG.

  As shown in FIG. 1, an electric compressor 1 that is a compressor has a housing 2. The housing 2 includes a substantially cylindrical compressor housing member 3, a front housing member 4 disposed on one opening side surface of the compressor housing member 3, and a motor housing disposed on the other opening side surface of the compressor housing member 3. It is comprised from the member 5. The compressor housing member 3, the front housing member 4 and the motor housing member 5 are all made of an aluminum alloy.

  The compression mechanism unit 10 is accommodated in the compressor housing member 3. The compression mechanism unit 10 includes a cylinder block 11 and a front side block 12 and a rear side block 13 that are respectively disposed on both side surfaces of the cylinder block 11. The blocks 11, 12 and 13 are fixed by bolts (not shown), and a cylinder chamber 14 is formed in the blocks 11, 12 and 13. The cylinder block 11 and the side blocks 12 and 13 on both sides are made of an aluminum alloy in the same manner as the housing members 3, 4 and 5.

  As shown in detail in FIG. 2, a rotor 15 is accommodated in the cylinder chamber 14. A rotation shaft 16 passes through the center of the rotor 15, and the rotor 15 and the rotation shaft 16 are fixed. The rotary shaft 16 is rotatably supported by the front side block 12 and the rear side block 13. The rear side of the rotating shaft 16 protrudes outside from the rear side block 13.

  Vane grooves 17 are formed at five positions at equal intervals on the outer peripheral side of the rotor 15. Each vane groove 17 is opened on the outer peripheral surface of the rotor 15. A vane 18 is disposed in each vane groove 17 so as to protrude and retract. Each vane 18 is configured to be biased in the protruding direction by the back pressure of the high-pressure refrigerant and the spring force of the coil spring 19. This detailed configuration will be described in detail below.

  Each vane 18 moves while contacting the inner wall of the cylinder chamber 14 by the biasing force in the protruding direction as described above when the rotary shaft 16 rotates. A plurality of compression chambers are formed in the cylinder chamber 14 between the adjacent vanes 18. Each compression chamber expands its volume in accordance with the rotation of the rotor 15 and repeats a suction stroke for sucking refrigerant, a compression stroke for reducing the volume, compressing the sucked refrigerant, and discharging the refrigerant.

  The cylinder block 11 and the like are provided with suction ports (not shown) that communicate with the refrigerant suction passage 20 and the cylinder chamber 14 at two positions of a 180 ° rotation position. In the cylinder block 11 or the like, discharge ports (not shown) that communicate between the refrigerant discharge passage 21 and the cylinder chamber 14 are formed at two positions of a 180 ° rotation position.

  Returning to FIG. 1, the motor 6 is accommodated in the motor housing member 5. The motor 6 includes a motor rotor 23 fixed to the rotating shaft 22 and a stator 24 fixed to the inner peripheral surface of the motor housing member 5. Both end portions of the rotating shaft 22 are rotatably supported by the motor housing member 5 and the rear side block 13 via ball bearing members 25a and 25b, respectively. One end side of the rotation shaft 22 is connected to the rotation shaft 16 of the compression mechanism unit 10. On the outer periphery of the motor rotor 23, S poles and N poles are alternately magnetized in the circumferential direction. The stator 24 includes a core (not shown) and a coil (not shown) wound around the core. The coil is energized by a drive current from a motor control unit (not shown) including an inverter or the like. The motor control unit is mounted on the front housing member 4.

  Next, the configuration of the biasing means of the vane 18 will be described in detail. As shown in detail in FIGS. 3 to 7, a single press-fitting hole 18 a is formed on the bottom surface side of each vane 18. The position of the press-fitting hole 18 a of each vane 18 is not the same position with respect to the rotation axis direction R of the rotor 15, but is set to a position shifted between the adjacent vanes 18 in the rotation axis direction R of the rotor 15. A guide pin 30 is press-fitted into the press-fitting hole 18a. That is, the guide pin 30 is integrally provided in the vane 18 by press fitting. The guide pin 30 is set to a length that can guide the entire length range of the coil spring 19 at the maximum protruding position of the vane 18. The press-fitting hole 18a has a large-diameter portion on the inlet side, and a spring receiving surface (not labeled) is formed by a step on the bottom side of the large-diameter portion.

  A high-pressure refrigerant supply passage 31 is opened at the bottom of each vane groove 17, and the high-pressure refrigerant supplied from the high-pressure refrigerant supply passage 31 acts as a back pressure of the vane 18. The rotor 15 is provided with guide pin relief holes 32 that open to the bottom surface side of the vane grooves 17. The position of the guide relief hole 32 of each vane groove 17 is set to a position corresponding to the position of the guide pin 30 of the vane 18 disposed in each vane groove 17 (see FIGS. 5 to 7). The guide pin escape hole 32 is composed of a large-diameter portion 32a that opens to the vane groove 17 and a small-diameter portion 32b that continues to the large-diameter portion 32a. A spring receiving surface (not labeled) is formed by a boundary step between the large diameter portion 32a and the small diameter portion 32b.

  The coil spring 19 is disposed on the outer periphery of the guide pin 30, and one end thereof is supported on the spring receiving surface of the vane 18 and the other end is supported on the spring receiving surface of the rotor 15. The coil spring 19 is accommodated in the large diameter portion of the press-fitting hole 18 a of the vane 18 and the large diameter portion 32 a of the vane groove 17 and the guide pin escape hole 32.

  As described above, the coil springs 19 and the guide pins 30 of the adjacent vanes 18 are respectively arranged at positions shifted in the rotation axis direction R of the rotor 15.

  In the above configuration, when the motor 6 rotates, the rotation shaft 16 of the compression mechanism unit 10 rotates together with the rotation of the rotation shaft 22, whereby the rotor 15 rotates the cylinder chamber 14. Then, the vane 18 disposed on the outer peripheral side of the rotor 15 receives the spring force of the coil spring 19 and moves while contacting the inner wall of the cylinder chamber 14. A compression chamber for changing the volume is formed in the cylinder chamber 14 between the adjacent vanes 18 to compress the refrigerant. As the refrigerant is compressed, high pressure refrigerant is supplied from the high pressure refrigerant supply passage 31 to the bottom of the vane groove 17, and the vane 18 is urged in the protruding direction by the back pressure of the high pressure refrigerant and the spring force of the coil spring 19. . Thus, even when the compression is started when the back pressure of the high-pressure refrigerant does not act, chattering does not occur because the spring force of the coil spring 19 acts on the vane 18.

  As described above, in the first embodiment, the coil springs 19 and the guide pins 30 of the adjacent vanes 18 are respectively arranged at positions shifted in the rotation axis direction R of the rotor 15. Therefore, even if the coil spring 19 and the guide pin 30 that urge the adjacent vanes 18 are arranged deep inside the rotor 15, the arrangement positions of the two do not overlap each other. Therefore, as in the first embodiment, they are adjacent to each other. The coil spring 19 and the guide pin 30 can be disposed deep in the rotor 15 with respect to each other. As a result, the stroke of the vane 18 in the protruding / retracting direction can be increased to improve the compression rate, and the length of the coil spring 19 and the guide pin 30 can be increased to extend the life of the coil spring 19. .

  In the first embodiment, the guide pin 30 is set to a length that can guide the entire length range of the coil spring 19 at the maximum protruding position of the vane 18. Therefore, it is possible to reliably prevent the coil spring 19 from biting when buckling.

(Second Embodiment)
FIGS. 8A to 8C are cross-sectional views of the biasing means for adjacent vanes according to the second embodiment of the present invention.

  As shown in FIGS. 8A to 8C, in the second embodiment, the combination of the coil spring 19 and the guide pin 30 is provided in two places for each vane 18 as compared with the first embodiment. The difference is provided. The coil springs 19 and the guide pins 30 provided at two places are provided at symmetrical positions with respect to the rotation axis direction of the rotor 15. In addition, the coil springs 19 and the guide pins 30 of the adjacent vanes 18 are respectively arranged at positions shifted in the rotation axis direction R of the rotor 15. Specifically, the relative positions of the coil spring 19 and the guide pin 30 are as shown in FIG. 8A, an intermediate position shown in FIG. 8B, and an intermediate position shown in FIG. 8C. There are three patterns at the separation positions, and these three patterns are arranged to satisfy the above conditions.

  The other configuration is the same as that of the first embodiment, and a duplicate description is omitted.

  In this second embodiment, since the coil spring 19 and the guide pin 30 are arranged at two locations on the bottom surface side of each vane 18, the spring force per one of the coil springs 19 can be halved and repeated. Long life can be achieved.

  In the second embodiment, since the two coil springs 19 and the guide pins 30 are arranged at symmetrical positions of the vane 18, the spring force acts on the vane 18 in a well-balanced manner, so that the vane 18 moves smoothly. To do.

  In this 2nd Embodiment, although the coil spring 19 and the guide pin 30 were provided in two places, you may provide in three or more places.

(Third embodiment)
FIG. 9 is a cross-sectional view of an essential part according to the third embodiment of the present invention.

  As shown in FIG. 9, in the third embodiment, the coil spring 19 and the guide pin 30 of the adjacent vane 18 are arranged at positions shifted in the rotation axis direction R of the rotor 15 as compared with the first embodiment. However, the difference is that the guide pin 30 is fixed to the rotor 15. And the pin escape hole 32 is provided in the bottom part of the vane 18 in the position corresponding to all the arrangement positions of the guide pin 30.

  The other configuration is the same as that of the first embodiment, and a duplicate description is omitted.

  In the third embodiment, the guide pin 30 is fixed to the rotor 15, and the vane 18 is provided with pin relief holes 32 at positions corresponding to all the arrangement positions of the guide pins 30. Therefore, since the same vane 18 can be disposed in any vane groove 17 regardless of the standing position of the guide pin 30, the assembling property of the vane 18 is good.

  In the third embodiment, there is one combination of the coil spring 19 and the guide pin 30, but there may be a plurality of combinations.

(Other)
In the first and second embodiments, the guide pin 30 that guides the coil spring 19 is fixed to the vane 18, but may be fixed to the rotor 15 so as to stand on the bottom surface of the vane groove 17.

1 is a cross-sectional view of a compressor according to a first embodiment of the present invention. 1 is a cross-sectional view of a compression mechanism portion according to a first embodiment of the present invention. FIG. 3 shows the first embodiment of the present invention and is a cross-sectional view taken along line AA in FIG. 2. 1 is a side view of a rotor according to a first embodiment of the present invention. FIG. 5 shows the first embodiment of the present invention and is a cross-sectional view taken along line BB in FIG. 4. FIG. 5 shows the first embodiment of the present invention and is a cross-sectional view taken along the line CC of FIG. FIG. 5 shows the first embodiment of the present invention and is a cross-sectional view taken along the line D-D in FIG. 4. (A)-(c) is each sectional drawing of the biasing means of the adjacent vane based on 2nd Embodiment of this invention. It is principal part sectional drawing which concerns on 3rd Embodiment of this invention.

Explanation of symbols

1 Electric compressor (compressor)
11 Cylinder block (block)
12 Front side block (block)
13 Rear side block (block)
14 Cylinder chamber 15 Rotor 17 Vane groove 18 Vane 19 Coil spring 30 Guide pin 32 Guide pin relief hole

Claims (4)

A cylinder chamber (14) is provided in the block (11, 12, 13), a rotor (15) is rotatably provided in the cylinder chamber (14), and a plurality of openings are formed in the outer surface of the rotor (15). Vane grooves (17) are provided, vanes (18) are disposed in the respective vane grooves (17) so as to be movable in the protruding and retracting directions, and the vanes (18) are disposed on the bottom surface side of the vanes (18). A compressor (1) provided with a coil spring (19) for urging the coil spring in a protruding direction and a guide pin (30) for guiding the coil spring (19),
The compressor (1) characterized in that the coil spring (19) and the guide pin (30) of the adjacent vanes (18) are respectively arranged at positions shifted in the rotation axis direction of the rotor (15). . Compressor (1) according to claim 1,
The compressor (1), wherein a plurality of the coil springs (19) and the guide pins (30) are arranged with respect to the vanes (18). Compressor (1) according to claim 2,
The compressor (1), wherein the plurality of coil springs (19) and the guide pins (30) are arranged at symmetrical positions of the vane (18). A compressor (1) according to any one of claims 1 to 3,
The guide pin (30) is fixed to the rotor (15), and the vane (18) is provided with pin relief holes (32) at positions corresponding to all the arrangement positions of the guide pins (30). A compressor (1) characterized by the above.

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