JPH0220837B2 - - Google Patents

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's rotating sleeve rotates with the vane to prevent heat generation and wear caused by sliding of the vane tip, so it is suitable for use as a supercharger for automobile engines that operate at a wide range of rotation speeds from low to high speeds. It can be said that this is the optimal one.

However, during startup, the pressure in the air bearing chamber, which is the space formed by the inner peripheral surface of the center housing and the outer peripheral surface of the rotating sleeve, is atmospheric pressure or lower.
The inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve are in a state of contact, that is, a state in which the rotating sleeve cannot be sufficiently supported, and the rotating sleeve is pressed against the inner circumferential surface of the center housing by the compression pressure of the compressor at the time of startup. state.
As a result, the rotation of the rotating sleeve lacks smoothness, resulting in torque fluctuations and abnormal temperature rises 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 there is no torque fluctuation or abnormal temperature rise.

In order to achieve the above object, the rotary compressor of the present invention is characterized in that communicating holes extending from the inner circumferential surface of the rotary sleeve to the outer circumferential surface are bored at equal intervals in the circumferential direction. Through this communication hole, high-pressure air flows directly from the compression chamber into the air bearing chamber during startup, and after the pressure in the air bearing chamber reaches the internal pressure of the compressor, a static pressure air bearing is formed to ensure smooth rotation of the rotating sleeve. can get. Furthermore, a dynamic pressure bearing is formed simultaneously with the rotation of the rotating sleeve, resulting in even smoother rotation. In order to further enhance 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 FIGS. 1 to 3, a rotary shaft 12 integral with the rotor 10 of the compressor is supported by bearings 18 and 19 in front and rear side housings 21 and 23, and the shaft end on the front side includes: Pulley 1 receives the rotational drive of the engine
4 is installed. 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 10.
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 of mm is interposed. A rear cover 24 is fixed to the back side of the rear side housing 23 via a gasket, and the rear cover is connected to the discharge chamber 41.
and a suction chamber 51 are provided. The discharge chamber 41 is connected to the rear side housing 23 via a discharge valve 60 or directly to the rear side housing 23.
The discharge hole communicates with the discharge hole 42 of the rotor 10.
and a compression chamber 43 between the rotating sleeve 30 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 26 is provided on the sliding surfaces of the front and rear side housings 21 and 23 with respect to the rotating sleeve 30, and the non-lubricated sliding member 2 is provided therein.
Attach 5. 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
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
and the center housing 22 from the high pressure groove 45.
is connected to the discharge side of the air bearing chamber 40 through a high pressure path consisting of a plurality of high pressure introduction holes 46 extending in the axial direction of communicate. or,
The discharge chamber 41 includes a high-pressure inner hole 48 that penetrates diagonally inward through the rear side housing 23 from a discharge hole 42, and a rear side housing 23 that intersects with the high-pressure inner hole.
It communicates with the bottom of the vane groove 15 of the vane 16 on the discharge side via the high pressure vane groove 49 on the inner surface. The suction chamber 51 includes an air return hole 56 that passes through the suction side of the center housing 22, a low pressure groove 55 that intersects with the air return hole and runs around the suction side of both end faces of the center housing 22, and the low pressure groove and the air bearing chamber. 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 50 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. An exhaust hole 50 is branched from the air return hole 56, and the exhaust hole is provided with a check valve if necessary. The suction chamber 51 has a low-pressure inner hole 58 that penetrates the rear side housing 23 obliquely inward, and a vane of the vane 16 that comes to the suction side via a low-pressure inner hole 58 that communicates with the low-pressure inner hole on the inner surface of the rear side housing 23. It also communicates with the bottom of the groove 15.

As shown in FIGS. 4 and 5, a W-shaped gas accumulation groove 3 is formed along the outer peripheral surface 31 of the rotating sleeve 30.
2 are carved all around the circumference by methods such as rolling, electrolytic etching, sandblasting, etc., and communication holes 36 extending from the outer circumferential surface 31 to the inner circumferential surface 37 in the radial direction are arranged at equal intervals on the center circumference. Each communication hole 36 is located at a protrusion on the rotational direction side of the gas accumulation groove 32. 15th
As shown in the figure, when the gas accumulation groove 35 is carved in the inner circumferential surface 34 of the center housing 22, the sixth
As shown in the drawings and FIG. 7, the gas accumulation grooves on the outer peripheral surface 31 of the rotary sleeve 30 may be omitted and only the communication holes 36 may be provided.

As shown in FIGS. 8 and 9, two rows of smooth portions may be left on the outer circumferential surface 31 of the rotating sleeve 30, and communicating holes 36 may be provided in the protrusions of the central herringbone-shaped gas accumulation groove 32. good. 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. As shown in FIGS. 11 to 14, 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 to start the compressor, the compression chamber 4 pushed into the vane 16
The air of No. 3 is directly blown out from the communication hole 36 into the air bearing chamber 40 and immediately increases the pressure in the air bearing chamber 40. As a result, the air bearing chamber 40 has a load force acting as an air bearing that supports the rotating sleeve 30 immediately after starting, so the rotating sleeve 30 rotates together with the vane 16 from the initial stage of starting, and shows a good start-up.

After startup, when the pressure in the discharge chamber 41 rises, high-pressure air in the discharge chamber 41 is ejected from the throttle 47 on the inner circumferential surface of the center housing 22 through the high-pressure path, and then returns to the suction chamber 51 or the atmosphere from the low-pressure path. The air bearing chamber 40 forms an air bearing having a rotary sleeve 30 at the same time as forming a hydrostatic bearing at the initial stage of rotation.
The bearing has the function of a so-called hybrid air bearing, which has both the functions of a dynamic pressure bearing generated by the rotation of the air 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 described above, since the rotary compressor of the present invention has a good start-up and the rotary sleeve rotates smoothly together with the rotor from the initial stage of startup, troubles during startup due to poor rotation of the rotary sleeve are prevented. or,
The reduction 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 a cross section taken along the line - in FIG. 2. 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. Figures 8 to 14 show the fourth example of different embodiments, respectively.
FIG. 15, a figure corresponding to FIG. 5, and FIG. 15 are partially exploded views of the inner circumferential 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: communication hole,
40: Air bearing chamber, 41: Discharge chamber, 51: Suction chamber.

Claims (1)

[Scope of Claims] 1. A rotating sleeve rotatably supported on a center housing, a rotor that rotates at an eccentric position of the rotating sleeve, a vane fitted into the rotor so as to be removable, and a vane that is connected to the center housing from a discharge chamber. In a rotary compressor comprising a high-pressure path formed between the rotating sleeves and leading to an air bearing chamber, and a low-pressure path leading from the air bearing chamber to the atmosphere or a suction chamber, the rotary sleeve has an inner peripheral surface and an outer peripheral surface thereof. A rotary compressor characterized by having communication holes formed at equal intervals in the circumferential direction to communicate with the rotary compressor. 2. A patent claim characterized in that a gas accumulation groove extending in the circumferential direction or in a direction diagonal to the circumferential direction is carved in one or both of the outer circumferential surface of the rotating sleeve and the inner circumferential surface of the center housing. The rotary compressor according to scope 1. 3. The rotary compressor according to claim 2, characterized in that a communicating hole is carved in the protrusion or the tip of the gas accumulation groove carved in the outer peripheral surface of the rotary sleeve on the rotation direction side.