JP5342202B2 - Vane rotary compressor - Google Patents

Description

  The present invention relates to a vane rotary compressor.

   Patent Documents 1 and 2 propose a vane rotary compressor. The vane rotary compressor includes a cylinder chamber having an elliptical inner wall shape, a rotor rotatably disposed in the cylinder chamber, and a rotor such that a front end side slides on an inner wall surface of the cylinder chamber as the rotor rotates. The rotor is provided with a vane groove that accommodates the vane so that the vane can move forward and backward, and a back pressure chamber is provided between the bottom of the vane groove and the rear end side of the vane. ing.

By supplying oil to the back pressure chamber, the vane receives back pressure and protrudes from the vane groove, and the oil is discharged from the back pressure chamber in which the vane is drawn into the vane groove.
JP 2002-250291 Shokai 58-104381

  However, just before the vane protrudes to the maximum from the state of the long diameter, the vane exits the vane groove or enters the vane groove due to the oil being discharged from the back pressure chamber. In addition, since it repeatedly collides with the cylinder chamber wall, so-called chatter noise is generated.

  Further, in the state of the short diameter when the vane is drawn into the vane groove to the maximum, the vane is so-called splashing, so that the supply of oil into the back pressure chamber is increased to increase the pressure. For this reason, extra power is required because the pressure in the back pressure chamber needs to be kept high.

  Therefore, an object of the present invention is to provide a vane rotary compressor that can suppress the generation of chatter noise and does not require extra power.

In the first aspect of the invention, the cylinder chamber 3 having an elliptical inner wall shape, the rotor 4 rotatably disposed in the cylinder chamber 3, and the inner wall surface 6 of the cylinder chamber 3 as the rotor 4 rotates are provided. The vane 5 is held by the rotor 4 so that the front end side 5a slides, and the rotor 4 is provided with a vane groove 8 that accommodates the vane 5 so as to be able to advance and retreat, and a bottom 8a of the vane groove 8 The vane rotary compressor 1 is provided with a back pressure chamber 9 to which oil is supplied between the vane 5 and the rear end side 5b of the vane 5, and includes a bottom 8a of the vane groove 8 or a rear end side 5b of the vane 5. The pin 7 provided on any one of the above and the bottom 8a of the vane groove 8 or the rear end side 5b of the vane 5 is provided on the other to house the pin 7 and the peripheral surface 7a of the pin 7 The back pressure chamber has a gap 10 therebetween. A pin which becomes the maximum space 11 when the vane 5 protrudes to the maximum length from the inside of the vane groove 8 and becomes the minimum space 12 when the vane 5 is stored in the vane groove 8 to the maximum length. An accommodation recess 13 is provided , and the oil supplied to the pin accommodation recess 13 is squeezed out to the back pressure chamber 9 through the gap 10, whereby the pin accommodation recess (13) and the gap (10) It is characterized in that the pressure in the pin housing recess 13 is increased by the squeezing effect between the two .

  The invention according to claim 2 is the vane rotary compressor 1 according to claim 1, wherein the pin 7 is press-fitted into the bottom 8 a of the vane groove 8, and the pin housing recess 13 is on the rear end side of the vane 5. It is provided in 5b.

  The invention according to claim 3 is the vane rotary compressor 1 according to claim 2, wherein the peripheral surface 7 a of the pin 7 is formed between the bottom 8 a of the vane groove 8 and the rear end side 5 b of the vane 5. A compression coil spring 14 is arranged.

According to the present invention, by the structure described above, when the major axis state the minor state, the flow Rukoto oil from the pin housing recess to the back pressure chamber through the gap, the back pressure chamber oil from the gap Since the pressure is squeezed to the side, the pressure in the pin housing recess is increased due to the squeezing effect of the gap. In other words, since the vane is pressed toward the cylinder inner wall by the pressure of the oil, it comes out of the vane groove or enters the vane groove due to the oil being discharged from the back pressure chamber, and repeatedly on the cylinder inner wall. Since there is no collision, the generation of chatter noise can be suppressed.

  In addition, even when the vane is drawn into the vane groove to the maximum, the vane does not splash because force is applied in the direction in which the vane protrudes from the vane groove due to the oil pressure in the pin housing recess. Since there is no need to keep the back pressure chamber at a high pressure, there is no need to provide extra power.

  Hereinafter, the detail of the vane rotary compressor which concerns on this invention is demonstrated based on embodiment shown to drawing.

<First Embodiment>
1 is an overall cross-sectional view of a vane rotary compressor according to the present invention, FIG. 2 is a rear cross-sectional view of the compressor according to the present invention, FIG. 3A is an enlarged cross-sectional view of the main part at the long diameter according to the present embodiment, FIG. 4B is an enlarged cross-sectional view of the main part at the time of the short diameter according to the present embodiment, FIG. 4A is an enlarged cross-sectional view of the main part at the time of the long diameter of the other embodiment, and FIG. FIG.

  As shown in FIG. 1, the vane rotary compressor 1 of the present embodiment includes a cylinder chamber 3 having an elliptical inner wall shape, a rotor 4 rotatably disposed in the cylinder chamber 3, and rotation of the rotor 4. Accordingly, the rotor 4 is provided with a vane 5 that is held by the rotor 4 so that the front end side 5a slides on the inner wall surface 6 of the cylinder chamber 3, and the rotor 4 is provided with a vane groove 8 that accommodates the vane 5 so as to freely move forward and backward. A back pressure chamber 9 to which oil is supplied is provided between the bottom 8 a of the vane groove 8 and the rear end side 5 b of the vane 5.

  In the present embodiment, the vane rotary compressor 1 is a vane rotary compressor, and mainly includes a cylinder block 2, a rotor 4, a vane 5, and a pair of side blocks 15 and 15. The cylinder block 2 has a hole having a noncircular (elliptical) inner wall surface 6 having a smooth inner periphery, and the rotor 4 is rotatably disposed and accommodated in the hole. A pair of side blocks 15 and 15 are disposed on both sides of the cylinder block 2.

  The cylinder chamber 3 is formed in an interior surrounded by the hole portion of the cylinder block 2 and the pair of side blocks 15 and 15, and the rotor 4 is rotatably disposed in the cylinder chamber 3. As shown in FIG. 2, the cylinder chamber 3 has an elliptical inner wall shape, and the front end side 5 a of the vane 5 slides on the inner wall surface 6 with the rotation of the rotor 4 to compress the refrigerant.

  The vane 5 is provided in a vane groove 8 provided in the rotor 4 so as to freely advance and retract. The vane groove 8 includes a bottom portion 8a and a back pressure chamber 9 through which oil circulates. A press-fit portion 18 into which the pin 7 is press-fitted is formed in the bottom portion 8a. High pressure oil is supplied to the back pressure chamber 9 so that the vane 5 is pressed and protrudes from the vane groove 8 when the diameter is long. When the diameter is short, the oil in the back pressure chamber 9 is a gap between the rotor 4 and the side blocks 15 and 15. The gas is discharged into the cylinder chamber 3 through the gap between the side blocks 15 and 15 and the vane 5.

  The pin 7 is provided at the bottom 8 a of the vane groove 8, and a pin housing recess 13 is formed on the rear end side 5 b of the vane 5. The pin housing recess 13 is slightly larger than the diameter of the pin 7, and an appropriate gap 10 is formed between the pin 7 and the pin housing recess 13. Circulate.

  As shown in FIGS. 3 (a) and 3 (b), oil is supplied to the back pressure chamber 9 when the diameter is long, and oil is supplied to the maximum space 11 through a gap 10 between the peripheral surface 7a of the pin 7 and the inner wall of the pin housing recess 13. Is supplied. As the rotor 4 rotates, the oil supplied to the maximum space 11 moves back through the gap 10 between the peripheral surface 7a of the pin 7 and the inner wall of the pin housing recess 13 as the vane 5 moves from the longer diameter to the shorter diameter. The pressure chamber 9 is pushed out.

  According to the present embodiment, by providing the pin housing recess communicated with the back pressure chamber, oil is squeezed from the gap toward the back pressure chamber when the major axis is changed to the minor axis. The pressure in the storage recess is increased. As a result, in the vicinity of the minor axis, a back force that is insufficient can be compensated. Therefore, since oil does not exit from the vane groove or enter the vane groove due to the oil being discharged from the back pressure chamber, it does not repeatedly collide with the cylinder chamber wall, thereby suppressing chatter noise. it can. Further, even in the state of the short diameter when the vane is drawn into the vane groove to the maximum, the vane does not splash and it is not necessary to provide extra power for keeping the pressure in the back pressure chamber high.

Second Embodiment
The vane rotary compressor of 2nd Embodiment is demonstrated using FIG.

  As shown in FIG. 4, the pin 7 of the present embodiment is press-fitted into the bottom 8 a of the vane groove 8, and the pin housing recess 13 is provided on the rear end side 5 b of the vane 5, and the bottom 8 a of the vane groove 8 and the vane 5 A compression coil spring 14 is disposed on the peripheral surface 7a of the pin 7 between the rear end side 5b.

  As shown in FIGS. 4A and 4B, oil is supplied to the back pressure chamber 9 when the diameter is long, and oil is supplied to the maximum space 11 through the space between the pin 7 and the peripheral surface 7 a. As the rotor 4 rotates, as the vane 5 moves from the longer diameter to the shorter diameter, the oil supplied to the maximum space 11 is pushed out to the back pressure chamber 9 through the pin 7 and the peripheral surface 7a, The oil in the pressure chamber 9 is discharged. Since the compression coil spring 14 is disposed on the peripheral surface 7a of the pin 7, even if the vane 5 moves from the long diameter to the short diameter, the compression coil spring 14 biases the vane 5 toward the front end 5a.

  According to the present embodiment, by providing the pin housing recess communicated with the back pressure chamber and arranging the compression coil spring on the peripheral surface of the pin, even if the vane moves from the major axis to the minor axis, The vane is urged to the front end side. As a result, in the vicinity of the minor axis, a back force that is insufficient can be compensated. Therefore, since oil does not exit from the vane groove or enter the vane groove due to the oil being discharged from the back pressure chamber, it does not repeatedly collide with the cylinder chamber wall, thereby suppressing chatter noise. it can. Further, even in the state of the short diameter when the vane is drawn into the vane groove to the maximum, the vane does not splash, and there is no need to provide power for maintaining a high pressure. Furthermore, the generation of chatter noise can be further suppressed by providing the pin with the compression coil spring.

The whole sectional view of the vane rotary compressor concerning the present invention. FIG. 3 is a rear sectional view of the compressor according to the present invention. (A) is a principal part expanded sectional view at the time of the long diameter which concerns on this embodiment. (B) is a principal part expanded sectional view at the time of the minor axis concerning this embodiment. (A) is a principal part expanded sectional view at the time of the major axis of other embodiment. (B) is a principal part expanded sectional view at the time of the minor axis of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vane rotary compressor 3 Cylinder chamber 4 Rotor 5 Vane 5a Front end side 5b Rear end side 6 Inner wall surface 7 Pin 7a Circumferential surface 8 Vane groove 8a Bottom surface 9 Back pressure chamber 10 Crevice 11 Maximum space 12 Minimum space 13 Pin storage recess

Claims (3)

A cylinder chamber (3) having an elliptical inner wall shape, a rotor (4) rotatably disposed in the cylinder chamber (3), and an inner wall surface of the cylinder chamber (3) as the rotor (4) rotates (6) is composed of a vane (5) held by the rotor (4) so that the front end side (5a) slides, and the vane (5) is accommodated in the rotor (4) so as to freely advance and retract. A groove (8) is provided, and a back pressure chamber (9) to which oil is supplied is provided between the bottom (8a) of the vane groove (8) and the rear end side (5b) of the vane (5). Vane rotary compressor (1),
A pin (7) provided on either the bottom (8a) of the vane groove (8) or the rear end side (5b) of the vane (5), and the bottom (8a) of the vane groove (8) or The pin (7) is accommodated by being provided on either one of the rear end side (5b) of the vane (5) and has a gap (10) between the peripheral surface (7a) of the pin (7). The vane (5) communicates with the back pressure chamber (9), and the vane (5) becomes the maximum space (11) when the major diameter projects from the vane groove (8) to the maximum length, and the vane (5) becomes the vane groove. (8) A pin storage recess (13) that becomes the minimum space (12) when the short diameter is stored in the maximum length is provided in the inside ,
When the oil supplied to the pin housing recess (13) is squeezed out to the back pressure chamber (9) through the gap (10), the pin housing recess (13) and the gap (10) A vane rotary compressor (1) characterized in that the pressure in the pin housing recess (13) increases due to the squeezing effect . A vane rotary compressor (1) according to claim 1,
The pin (7) is press-fitted into the bottom (8a) of the vane groove (8), and the pin housing recess (13) is provided on the rear end side (5b) of the vane (5). Vane rotary compressor (1). A vane rotary compressor (1) according to claim 2,
A compression coil spring (14) is disposed on the peripheral surface (7a) of the pin (7) between the bottom (8a) of the vane groove (8) and the rear end side (5b) of the vane (5). A vane rotary compressor (1) characterized in that

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