JPH0558888U - Vane compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the chattering of the vane at the time of starting the compressor, and to prevent the deformation of the vane tip and the inner surface of the cam ring with which the tip slides to improve the reliability of the compressor. In a vane type compressor including a plurality of vanes 14 that are fitted in the vane grooves 13 of a rotor 2 so as to be retractable in a radial direction, a bottom surface of each vane groove 13 and a bottom surface of each vane 14 are provided with facing surfaces. It is formed non-parallel. When the compressor is activated, all of the back pressure of the vanes introduced into the wedge-shaped spaces 100 and 101 acts as a force for ejecting each vane, and the back pressure of the vanes causes the vanes to have a gap between the two sides of the rotor 2. It tilts inside and acts as a force that separates the bottom of each vane 14 from the bottom of each vane groove, which reduces the surface tension and viscosity of the lubricating oil, and facilitates each vane to pop out.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a vane type compressor used for a vehicle air conditioner or the like.

[0002]

[Prior Art]

 Conventionally, as a vane type compressor, a cylinder composed of a cam ring and side blocks closing both end surfaces of the cam ring, a rotor rotatably housed in the cylinder, and a vane groove of the rotor are arranged to protrude and retract in a radial direction. It is known to have a plurality of vanes freely fitted.

Generally, in such a vane type compressor, each vane housed in each vane groove of the rotor is driven by the centrifugal force generated by the rotation of the rotor and the back pressure of the vane acting on the bottom of the vane, to cause the inner circumference of the cam ring to move. Pressed against the surface, the refrigerant is sucked, compressed, and discharged between the vanes. When the compressor is stopped, the rotor reversely rotates due to the pressure difference between the high-pressure side and the low-pressure side in the refrigeration cycle to which the compressor is connected, so that each vane is stored in each vane groove of the rotor. Then, when the compressor is started, each vane must be pressed against the inner peripheral surface of the cam ring by the centrifugal force due to the rotation of the rotor and the back pressure of the vane, but between the bottom of each vane and the bottom of each vane groove. Since the lubricating oil exists in the vane, the proper back pressure of the vane on the bottom of each vane is blocked by the lubricating oil, and the vane is hard to pop out due to the viscosity and surface tension of the lubricating oil. I will end up. As a result, chattering of the vanes occurs when the compressor starts up, which not only causes abnormal noise, but also deforms the tips of the vanes and the inner surface of the cam ring, which reduces reliability. ..

Therefore, as a conventional vane type compressor, it is prevented that the surface tension of the lubricating oil between the bottom of the vane groove and the bottom of the vane prevents the vane from jumping out at low speed operation of the compressor. In order to achieve this, a first groove formed on the bottom surface of the vane groove or on the bottom surface of the vane in the longitudinal direction of the vane, and a plurality of second grooves formed substantially orthogonal to the groove. It is known to provide (Japanese Utility Model Publication No. 56-10953).

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, the contact area between the bottom surface of the vane groove and the bottom surface of the vane decreases, and the surface tension of the lubricating oil decreases. However, since the first groove extending in the longitudinal direction of the vane is formed on the bottom surface of the vane groove or the bottom surface of the vane, a space between the bottom surface of the vane groove and the bottom surface of the vane is formed on both end surfaces of the rotor. Since the space between each side block and the first groove is always in communication with each other, the back pressure of the vane introduced to the bottom of the vane groove at the time of starting the compressor causes the back pressure of the vane to be the same as that of the first groove. It escapes and escapes to the gaps on both end faces. Therefore, when the compressor is started, the force in the direction in which each vane pops out due to the back pressure of the vane becomes small, the vane becomes difficult to pop out, and the chattering of the vane occurs.

Further, according to this conventional technique, at the time of starting the compressor, the bottom surface of each vane and the bottom surface of each vane groove are close to each other on all surfaces except the first and second grooves. Even if back pressure acts on the bottom of each vane, the bottom of each vane is difficult to separate from the bottom of each vane groove due to the viscosity and surface tension of the lubricating oil. Therefore, there is a problem that the vanes are less likely to pop out when the compressor is started, and the chattering of the vanes occurs.

The present invention has been made in view of such a conventional problem, and prevents chattering of the vane at the time of starting the compressor, and at the same time, deforms the tip of the vane and the inner surface of the cam ring with which the tip slides. It is an object of the present invention to provide a vane type compressor that prevents the above and improves the reliability of the compressor.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a cylinder including a cam ring and side blocks closing both end surfaces of the cam ring, a rotor rotatably housed in the cylinder, and a vane groove of the rotor. In a vane type compressor provided with a plurality of vanes fitted so as to be retractable and retractable in a certain direction, the bottom surfaces of the vane grooves and the bottom surfaces of the vanes are formed to be non-parallel to each other.

[0009]

[Action]

 Since the bottom surface of each vane groove and the bottom surface of each vane are formed to be non-parallel, each vane is stored in each vane groove when the compressor is stopped, and the bottom of each vane is set to each vane groove. At the bottom of each vane, a wedge-shaped space is formed between the bottom of each vane and the bottom of each vane groove, facing the rotation axis of the rotor. The area of the area where the vane groove and the bottom of each vane groove are close to each other is reduced, and the surface tension and viscosity of the lubricating oil existing between the two are reduced, so that each vane easily pops out. Further, when the compressor is started up, all of the vane back pressure introduced into the wedge-shaped space acts as a force for ejecting each vane, and this vane back pressure acts between each vane and the rotor and each side block. Tilted in the gap between the vanes and acts as a force in the direction of separating the bottom of each vane from the bottom of each vane groove, which reduces the surface tension and viscosity of the lubricating oil existing between the bottoms, which also causes each vane to It's easier to jump out.

[0010]

【Example】

 Hereinafter, each embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a vertical sectional view showing a vane type compressor according to a first embodiment of the present invention.

As shown in FIGS. 2 and 3, the variable displacement vane type compressor has a cam ring 1 having a substantially elliptical inner peripheral surface 1a and both end surfaces of the cam ring 1 fixed so as to close both end surfaces thereof. A cylinder composed of a front side block 3 and a rear side block 4, a cylindrical rotor 2 rotatably housed in the cylinder, and fronts fixed to the outer end surfaces of the side blocks 3 and 4, respectively. The head 5, the rear head 6, and the rotating shaft 7 of the rotor 2 are the main constituent elements. The rotating shaft 7 is rotatably supported by bearings 8 and 9 provided on the both side blocks 3 and 4, respectively.

A discharge port 5a for a refrigerant gas, which is a heat medium, is formed on the upper surface of the front head 5, and a suction port 6a for the refrigerant gas is formed on the upper surface of the rear head 6. The discharge port 5a communicates with a discharge chamber 10 defined by the front head 5 and the front side block 3, and the suction port 6a communicates with a suction chamber 11 defined by the rear head 6 and the rear side block 4.

Between the inner peripheral surface 1 a of the cam ring 1 and the outer peripheral surface of the rotor 2, two compression spaces 12 are symmetrically formed with a 180 ° offset in the circumferential direction. The rotor 2 is provided with a plurality (for example, five) of vane grooves 13 extending along the radial direction thereof at equal intervals in the circumferential direction, and the vanes 14 are respectively arranged in the vane grooves 13 along the radial direction. It is fitted so that it can appear and disappear freely.

An annular back pressure introducing groove 15 is provided on an end surface of the front side block 3 on the rotor side. The back pressure introducing groove 15 communicates with a vane back pressure chamber 130 formed at the bottom of each vane groove 13. The pressure of the compression space 12 is introduced into the back pressure introducing groove 15 through the gap between the front side block 3 and the rotor 2 to form an intermediate pressure vane back pressure. Are introduced into each vane back pressure chamber 130. On the other hand, the pressure in the compression space 12 is also introduced into each vane back pressure chamber 130 as an intermediate vane back pressure from the gap between the rear side block 4 and the rotor 2.

As shown in FIG. 1A, the bottom surface of each vane back pressure chamber 130 (the bottom portion of each vane groove 13) and the bottom surface of each vane 14 are formed to be non-parallel to each other. Specifically, in the first embodiment, the bottom surface 14a of each vane 14 is a surface that is parallel to the axis of the rotating shaft 7. On the other hand, the bottom surface of each vane back pressure chamber 130 is provided with a flat surface 130a at the center of the rotary shaft 7 in the axial direction and inclined surfaces 130b and 130c on both axial sides of the flat surface 130a. .. Each of the inclined surfaces 130b and 130c has an arc shape.

In the vane type compressor according to the first embodiment having the above configuration, when the compressor is stopped, each vane 14 is stored in each vane groove 13 and each bottom surface (bottom portion) 14a of each vane 14 is individually moved. It is close to the flat surface 130a on the bottom surface of the vane back pressure chamber 130 (see FIG. 1B). At this time, wedge-shaped spaces 100 and 101 inclined with respect to the rotating shaft 7 are formed between the bottom surface 14a of each vane 14 and the inclined surfaces 130b and 130c on the bottom surface of each vane back pressure chamber 130.

When the compressor is started in such a state, the bottom surface 14a of each vane 14 is in close proximity only at the flat surface 130a of each vane back pressure chamber 130. And the bottom surface of each vane back pressure chamber 130 (bottom portion of each vane groove 13) have a small area where they are close to each other, and thus prevent each vane 14 from jumping out, between the bottom surface 14a and the flat surface 130a. The surface tension and viscosity of the lubricating oil present are small, so that each vane 14 easily receives the vane back pressure introduced into each wedge-shaped space 100, 101 and jumps out.

Further, when the compressor is started up, all of the back pressure of the vanes introduced into the wedge-shaped spaces 100, 101 is exposed to the wedge-shaped spaces 100, 101. Since each vane 14 receives the back pressure of the vanes, it acts as a force to cause the vanes 14 to pop out easily. Moreover, the back pressure of the vanes introduced into the wedge-shaped spaces 100, 101 causes the vanes 14 to move in the gaps between the rotors 2 and the side blocks 3, 4 by the solid or broken arrows in FIG. Is used as a force for slightly tilting in the direction indicated by, that is, a force for separating the bottom surface 14a of each vane 14 from the flat surface 130a, and each vane 14 is tilted as shown in FIG. 1C, for example. This also reduces the surface tension and viscosity of the lubricating oil that prevents each vane 14 from popping out, and makes each vane 14 more likely to pop out.

Next, a second embodiment of the present invention will be described. In the vane compressor according to the second embodiment, as shown in FIG. 4A, the bottom of each vane back pressure chamber 130 (each In order to make the facing surfaces of the vane groove 13) and the bottoms of the vanes 14 non-parallel to each other, the bottom surface of each vane back pressure chamber 130 has a flat surface 130d at its axial end and a rotary shaft 7a. Is formed with an inclined surface 130e that is inclined at an angle α with respect to.

In the vane type compressor according to the second embodiment, when the compressor is stopped, each vane 14 is stored in each vane groove 13, and the bottom surface (bottom portion) 14 a of each vane 14 is set to each vane back. It is close to the flat surface 130d on the bottom surface of the pressure chamber 130 (see FIG. 4B). At this time, a wedge-shaped space 102 inclined with respect to the rotating shaft 7 is formed between the bottom surface 14a of each vane 14 and the inclined surface 130e on the bottom surface of each vane back pressure chamber 130.

When the compressor is started in such a state, the bottom surface 14a of each vane 14 is in close proximity only at the flat surface 130d of each vane back pressure chamber 130. The surface tension of the lubricating oil existing between the bottom surface 14a and the flat surface 130d, which has a small area where the bottom surface of each vane back pressure chamber 130 is close to each other, and thus prevents each vane 14 from jumping out. In addition, the vane 14 has a low viscosity and is easily ejected by receiving the back pressure of the vane introduced into each wedge-shaped space 102.

Further, all the back pressure of the vanes introduced into each wedge-shaped space 102 at the time of starting the compressor is a force for ejecting each vane 14 to the lower surface 14 a of each vane 14 facing this wedge-shaped space 102. As a result, each vane 14 receives the back pressure of the vane and is easily ejected. In addition, the back pressure of the vanes introduced into each wedge-shaped space 102 causes each vane 14 to move in the gap between the rotor 2 and each side block 3 and 4 in the direction indicated by the solid arrow in FIG. 4B. It acts as a slight tilting force, that is, a force for separating the bottom surface 14a of each vane 14 from the flat surface 130a, and tilts each vane 14 as shown in FIG. 4 (c). This also reduces the surface tension and viscosity of the lubricating oil that hinders each vane 14 from popping out, and makes each vane 14 more likely to pop out.

FIG. 5 shows a third embodiment of the present invention.

In the vane type compressor according to the third embodiment, as shown in FIG. 5, the bottom surface of each vane back pressure chamber 130 is a flat surface 130 f parallel to the axis of the rotary shaft 7. On the other hand, on the bottom of each vane 14, there is formed a protrusion 140 that is provided at the center of the rotary shaft 7 in the axial direction and has a flat surface 140a that is parallel to the axis. Inclined surfaces 140b and 140c are formed on both sides of the protrusion 140.

In the vane type compressor according to the third embodiment, when the compressor is stopped, as shown in FIG. 5, the flat surface 140 a of the protrusion 140 of each vane 14 becomes a flat surface of each vane back pressure chamber 130. It is close to 130f. At this time, wedge-shaped spaces 103 and 104 are formed on both sides of the flat surface 140a.

When the compressor is started in such a state, the bottom of each vane 14 is close to the flat surface 130f of each vane groove 130 only at the location of the flat surface 140a of the protrusion 140, so each vane 14 has a small area where the bottom of each vane back pressure chamber 130 is close to each other. Therefore, the surface tension and viscosity of the lubricating oil that prevents each vane 14 from jumping out are small, and each vane 14 has a wedge shape. The vane back pressure introduced into the spaces 103 and 104 makes it easy to jump out.

Further, when the compressor is started, all of the back pressure of the vanes introduced into the wedge-shaped spaces 103 and 104 causes the vanes 14 to pop out to the lower surface of the vanes 14 facing the wedge-shaped spaces. As a result, each vane 14 receives the back pressure of the vane and easily pops out. In addition, the back pressure of the vanes introduced into the wedge-shaped spaces 103 and 104 causes the vanes 14 to slightly move in the gap between the rotor 2 and the side blocks 3 and 4 in the direction of the solid line or broken line arrow in FIG. It acts as a tilting force to tilt each vane 14. This also reduces the surface tension and viscosity of the lubricating oil that hinders each vane 14 from popping out, making each vane 14 more likely to pop out.

FIG. 6 shows a fourth embodiment of the present invention.

In the vane compressor according to the fourth embodiment, the bottom surface of each vane back pressure chamber 130 is a flat surface 130f parallel to the axis of the rotating shaft 7. On the other hand, a flat surface 140d parallel to the axis of the rotating shaft 7 and an inclined surface 140e inclined with respect to the axis are formed at the bottom of each vane 14 at the axial end of the rotating shaft 7.

Therefore, also in the fourth embodiment, the wedge-shaped space 130g similar to that in each of the above embodiments is formed.

[0032]

[Effect of the device]

 As described above, according to the vane of the present invention, the cylinder including the cam ring and the side blocks closing both end surfaces of the cam ring, the rotor rotatably housed in the cylinder, and the vane groove of the rotor are provided. In a vane type compressor provided with a plurality of vanes fitted in and out in a radial direction, the bottom surface of each vane groove and the bottom surface of each vane are formed to be non-parallel to each other. , When each vane is stored in each vane groove by stopping the compressor and the bottom of each vane is close to the bottom of each vane groove, the rotor is placed between the bottom of each vane and the facing surface of the bottom of each vane groove. Since there is a wedge-shaped space that is inclined with respect to the rotation axis, the area at the bottom of each vane and the bottom of each vane groove is reduced when the compressor starts, and the area between these bottoms decreases. Lubricating oil present Surface tension and viscosity decreases, the vane is easily jump out. Further, when the compressor is started, all of the back pressure of the vanes introduced into the wedge-shaped space acts as a force for popping out each vane, and this back pressure of the vanes causes each vane to move between the rotor and each side block. The vanes are tilted in the gap to act as a force to separate the bottom of each vane from the bottom of each vane groove, which reduces the surface tension and viscosity, which also facilitates each vane to pop out. Therefore, chattering of the vane can be prevented at the time of starting the compressor, and deformation of the vane tip and the inner surface of the cam ring with which this tip slides can be prevented, and the reliability of the compressor can be improved.

[Brief description of drawings]

FIG. 1A is a sectional view taken along the line AA of FIG. 3 showing a main part of a vane type compressor according to a first embodiment of the present invention, showing a vane protruding. Is.
(B) is a cross-sectional view similar to (a), showing a state where the vanes are stored in the vane grooves. (C) is a cross-sectional view similar to (a) and shows a state in which the vanes are inclined.

FIG. 2 is a vertical sectional view showing a vane type compressor according to a first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a rotor portion.

FIG. 4A is a sectional view showing a main part of a vane type compressor according to a second embodiment of the present invention, showing a vane protruding. (B) is a cross-sectional view similar to (a), showing a state where the vanes are stored in the vane grooves. (C) is a cross-sectional view similar to (a) and shows a state in which the vanes are inclined.

FIG. 5 is a cross-sectional view showing a main part of a vane type compressor according to a third embodiment of the present invention, showing how the vanes are stored in the vane grooves.

FIG. 6 is a cross-sectional view showing a main part of a vane type compressor according to a fourth embodiment of the present invention, showing how the vanes are stored in the vane grooves.

[Explanation of symbols]

 1 Cam Ring 2 Rotor 3,4 Side Block 13 Vane Groove 14 Vane

Claims (1)

[Scope of utility model registration request] 1. A cylinder comprising a cam ring and side blocks closing both end surfaces of the cam ring, a rotor rotatably housed in the cylinder, and a vane groove of the rotor fitted in a radial direction so as to be retractable. In a vane type compressor having a plurality of vanes, the vane type compressor is characterized in that the bottoms of the vane grooves and the bottoms of the vanes are opposed to each other in a non-parallel manner.