JPS59108890A - Rotary compressor - Google Patents

Abstract

PURPOSE:To smooth revolutions and prevent abnormal rise of temperature by forming a gas accumulating groove, stretching aslant to the circumferential direction, at the outside surface of a rotary sleeve and by providing a communication hole for the internal and external surfaces of the sleeve in its projection formed in the rotational direction. CONSTITUTION:By means of rolling method, electrolytic etching, sand blasting, etc., W-shaped gas accumulating grooves 32 are formed throughout the outside surface 31 of a rotary sleeve 30, and communication holes 36 leading from the inside surface 37 radially to the outside surface 31 are provided at a uniform spacing in the central circumference, where each communication groove 36 is situated in a projection of the gas accumulating groove 32 in the rotational direction. According to this arrangement, when the compressor is starting, the high pressure air in pneumatic bearing chamber 40 flows into said rotary sleeve 30 partially through the communication holes 36 to serve for enhancement of the rising characteristic of the compressor, and further because the rotary sleeve 30 rotates smoothly together with a rotor 10 already in the initial period of starting, so variation of the torque and abnormal rise of the temperature can be prevented.

Description

Detailed Description of the Invention The present invention relates to a vane-type rotary compressor that can be used as a supercharger for an internal combustion engine, and more specifically, the present invention relates to a vane-type rotary compressor that can be used as a supercharger for an internal combustion engine. This relates to compressors.

The applicant of the present invention previously proposed a vane-type rotary compressor in which a rotating sleeve is interposed between a rotor and a center housing, and the rotating sleeve is supported by a compressible fluid such as air (Japanese Patent Application No. 56-162025). No.). The compressor has a rotating sleeve that rotates with the vanes to prevent heat generation and wear caused by sliding of the vane tips, so it can be used in superchargers such as automobile engines that operate at a wide range of rotation speeds from low to high speeds. It can be said that it is the most suitable one.

However, at the time of startup, the pressure in the air bearing chamber, which is the space formed by the inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve, is at atmospheric pressure or lower.

The inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve are in contact with each other, that is, in a state where they cannot sufficiently support the rotating sleeve.
i! It is pushed against the inner peripheral surface of the center housing by the compression pressure of the machine.

For this reason, the rotation of the rotary sleeve is not smooth, and there is a drawback that torque fluctuations and abnormal salinity HiA occur during startup.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks by providing an excellent rotary compressor in which the rotary sleeve rotates smoothly and is free from torque fluctuations and abnormal temperature rises.

In order to achieve the above object, the rotary compressor of the present invention has the following features:
The reason for this is that communicating holes extending from the inner circumferential surface of the rotating sleeve to the outer circumferential surface are bored at equal intervals in the circumferential direction. Through this communication hole, high pressure air from pressure 1ii* directly flows into the air bearing chamber at the time of startup, and after the pressure in the air bearing chamber reaches the internal pressure of pressure ll1l#l, a static pressure air bearing is formed to smoothly rotate the rotating sleeve. rotation can be obtained. Furthermore, a dynamic pressure bearing is formed simultaneously with the rotation of the rotating sleeve, resulting in even smoother rotation. In order to increase the effect of the hydrodynamic bearing, it is desirable to provide gas accumulation grooves obliquely intersecting in the circumferential direction on either or both of the inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve. In this case, the communication hole is formed at the tip or protrusion on the rotation direction side of the gas accumulation groove on the outer circumferential surface of the rotating sleeve, which is under low pressure during rotation.

A compressor of the present invention will be explained based on embodiments shown in the drawings. As shown in Figures 1 to 3, the rotor l of the compression center
The rotating shaft 12, which is integral with the rotary shaft 12, is supported by bearings 18, 19 in the front and rear side housings 21, 23, and a pulley 14, which receives the rotational drive of the engine, is attached to the front end of the shaft. A plurality of vanes 16 are fitted into the rotor 10 so as to be removable and removable, and the tips of the vanes 16 are in contact with a rotating sleeve 30 surrounding the rotor IO.

The rotating sleeve 30 is housed inside the center housing 22, and there is a thickness of 0.02 mm to 0.15 mm between the two.
An air bearing chamber 40 is interposed. Rear side housing 2
A rear cover 24 is fixed to the back of the vehicle 3 via a gasket', and the rear cover is provided with a discharge chamber 41 and a suction chamber 51. The discharge chamber 41 communicates via a discharge valve 60 or directly with a discharge hole 42 of the rear side housing 23, which in turn communicates with a compression chamber 43 between the rotor 10 and the rotating sleeve 30. The suction chamber 51 communicates with an intake chamber 53 on the opposite side via a suction hole 52. An annular groove 2 is provided on the sliding surface of the front and rear side housings 21 and 23 with the rotating sleeve 3°.
6, into which the non-lubricated sliding member 25 is fitted. The bolt 27 passes through the thick part 28 of the center housing 22, and connects the front and rear housings 21.23, the center housing 22. Tighten the rear cover 24 in the axial direction.

As shown in FIGS. 2 and 3, the discharge chamber 41 includes a high pressure hole 44 passing through the rear side housing 23 and a high pressure groove 45 provided on the discharge side end surface of the inner surface of the center housing 22 that intersects with the high pressure hole. , a plurality of high pressure introduction holes 4 extending from the high pressure groove 45 in the axial direction of the center housing 22.
6 and a throttle 47 that opens from the high pressure introduction hole toward the discharge side outer circumferential surface of the rotary sleeve 30, communicating with the discharge side of the air bearing chamber 40. Moreover, the discharge chamber 41
The vane of the vane 16 comes to the discharge side via a high-pressure inner hole 48 that penetrates obliquely inward from the discharge hole 42 through the rear side housing 23 and a high-pressure vane groove 49 on the inner surface of the fired housing 23 that intersects with the high-pressure inner hole. It communicates with the bottom of the groove 15. The suction chamber 51 includes an air return hole 56 passing through the suction side of the center housing 22, low pressure grooves 5, 5 that intersect with the air return hole and run around the taste side of both end faces of the center housing 22, and the low pressure grooves It communicates with the suction side of the air bearing chamber 40 through a low pressure path consisting of an air return passage 57 that connects the air bearing chamber 5o, and a low pressure hole 54 that extends from the suction chamber 51 through the rear side housing 23 and reaches the low pressure groove 55. do. The exhaust hole 50 is branched from the air return hole 56, and the exhaust hole is provided with a reverse 11 valve if necessary. Also, the suction chamber 51
is also the bottom of the vane groove 15 of the vane 16 that comes to the suction side via the low pressure inner hole 58 that penetrates the rear side housing 23 obliquely inward and the low pressure vane groove 59 on the inner surface of the rear side housing 23 that communicates with the low pressure inner hole. communicate.

As shown in FIGS. 4 and 5, W-shaped gas accumulation grooves 32 are carved along the entire circumference of the outer peripheral surface 31 of the one-turn sleeve 30 by methods such as rolling, electrolytic etching, and sandblasting. Communication holes 36 extending radially from the surface 31 to the inner circumferential surface 37 are arranged at equal intervals around the center. Each communication hole 36 extends to a protrusion on the rotational direction side of the gas accumulation groove 32.

As shown in FIG. 15, when the gas accumulation grooves 35 are formed on the inner circumferential surface 34 of the center housing 22, the gas accumulation grooves 35 on the outer circumferential surface 31 of the rotating sleeve 30 are formed as shown in FIGS. 6 and 7. The groove may be omitted and only the communication hole 36 may be provided.

As shown in FIGS. 8 and 9, two rows of smooth portions are left on the outer circumferential surface 31 of the rotating sleeve 30, and a communicating hole 36 is provided in the protrusion of the herringbone-shaped gas accumulation groove 32 in the center. Good too. Further, as shown in FIG. 10, a slightly deep gas accumulation groove 33 extending in the circumferential direction is formed outside the gas accumulation groove 32 obliquely intersecting in the circumferential direction on the outer circumferential surface 31 of the rotating sleeve 30 to generate high pressure during rotation. A communication hole 36 may be formed in the groove to provide a hydrostatic bearing effect. Figures 11 to 14
As shown in the figure, a plurality of rows of communication holes 36 may be formed symmetrically.

Next, the operation of the rotary compressor of the present invention will be explained. When the engine rotation is transmitted to the pulley 14 and the compressor is started,
The air in the pressure & Iil chamber 43 pushed into the vane 16 is directly blown out into the air bearing chamber 4o through the communication hole 36, and
Immediately increase the pressure at o. As a result, the air bearing chamber 4o has a load force as an air bearing that supports the rotating sleeve 30 immediately after starting, so the rotating sleeve 3o
rotates together with the vane 16 from the initial stage of startup and exhibits good standing performance.

After startup, when the pressure in the discharge chamber 41 rises, high-pressure air in the discharge chamber 41 is blown out from the throttle 47 on the inner peripheral surface of the center housing 22 through the high-pressure path, and then flows into the suction chamber 51 through the low-pressure path.
Alternatively, the air bearing chamber 4o forms a so-called hybrid air bearing that has the functions of both forming a static pressure bearing at the initial stage of rotation and a dynamic pressure bearing generated by the rotation of the rotating sleeve 30. It becomes a functional bearing. In this case, the high pressure air in the air bearing chamber 40 presents a gas flow that partially flows into the rotary sleeve 30 through the communication hole 36 . In order to make the dynamic pressure effect more effective, gas accumulation grooves 32 are provided on either the inner circumferential surface of the center housing 22 or the outer circumferential surface of the rotating sleeve 30. However, if gas accumulation grooves are provided on both sides, the air bearing It is also possible to increase the stiffness several times.

As mentioned above, the rotary compressor of the present invention has a good vertical rotation and the rotary sleeve rotates smoothly together with the rotor from the initial stage of startup, so troubles during startup due to poor rotation of the rotary sleeve can be prevented. Ru. Further, the decrease in the load force on the air bearing chamber due to the communication hole provided in the rotary sleeve can be compensated for by providing a gas accumulation groove in the rotary sleeve.

[Brief explanation of drawings]

1 and 2 are a partially cutaway perspective view and a partially cutaway side view of a rotary compressor according to an embodiment of the present invention, and FIG. 3 is taken along line III-III in FIG. 4 and 5 are perspective views and side sectional views of the rotating sleeve of FIG. 1, and FIGS. 6 and 7 are views corresponding to FIGS. 4 and 5 of other embodiments. , FIGS. 8 to 14 are views corresponding to FIGS. 4 and 5 of different embodiments, respectively, and FIG. 15 is a partially exploded view of the inner peripheral surface of the center housing. 10: Rotor, 16: Vane, 22: Center housing, 30: Rotating sleeve, 31: Outer peripheral surface, 32.35
Gas accumulation groove, 36 Two communication holes, 40; Air bearing chamber, 41
:Discharge chamber, 51:Suction chamber Applicant: Nippon Piston Ring Co., Ltd. Figure 2-556- Figure 3 Figure 10 Figure 15 3534

Claims (1)

[Scope of Claims] 1) A rotating sleeve 7' rotatably supported by a center housing, a rotor rotating at an eccentric position of the rotating sleeve, a vane fitted into the rotor so as to be removable, and a discharge chamber. A rotary compressor comprising: a high pressure path leading from the center housing to an air bearing chamber formed between the center housing and the rotating sleeve; and a low pressure path leading from the air bearing chamber to the atmosphere or a suction chamber. A rotary compressor characterized in that communication holes are formed at equal intervals in the circumferential direction to communicate between an inner circumferential surface and an outer circumferential surface. 2) A patent claim characterized in that gas accumulation grooves extending in the circumferential direction or in a direction diagonal to the circumferential direction are carved on the entire circumference of either or both of the outer circumferential surface of the rotating sleeve and the inner circumferential surface of the center housing. The rotational pressure li described in item 1 within the range
! Machine. 3) A communication hole is carved in the protrusion or tip on the rotational direction side of the gas accumulation groove carved on the outer circumferential surface of the rotating sleeve.
A rotary compressor according to claim 2, which is characterized in that: