JPH0235876B2 - KAITENATSUSHUKUKI - 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 the rotor and the center housing, and the rotating sleeve is supported by compressible fluid such as air (Japanese Patent Application No. 56-162025). (Refer to Japanese Unexamined Patent Publication No. 1983-65988)).

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 supported sufficiently, and the rotating sleeve is in a state of being pressed against the inner circumferential surface of the center housing by the compression pressure at the time of startup. Become.

For this reason, the rotation of the rotating sleeve lacks smoothness.
There were drawbacks such as torque fluctuations and abnormal temperature rises during startup.

The technical problem of the present invention is to provide a good rotary compressor in which the rotary sleeve rotates smoothly and there is no torque fluctuation or abnormal temperature rise.

In order to solve the above technical problems, the configuration of the rotary compressor of the present invention, that is, the technical means are as follows.

In a rotary compressor comprising a rotary sleeve rotatably supported on a center housing, a rotor rotating at an eccentric position of the rotary sleeve, and a vane fitted in the rotor so as to be removable and retractable, the inner circumferential surface of the rotary sleeve An independent circumferential groove is provided continuously in the axial direction, and a vane is provided which can be slidably fitted into the groove.

With the above technical means, the contact area between the inner peripheral surface of the rotating sleeve and the sliding surface of the vane tip is increased, thereby increasing the friction resistance between the two, and the rotation of the rotor forces the rotating sleeve to rotate from the time of startup. It has a biasing function to form a dynamic pressure bearing in the air bearing chamber more quickly, and has an effect unique to the present invention that allows smoother rotation to be obtained.

It is also effective in preventing the rotor, vanes, and rotating sleeve from shifting in the axial direction.

An embodiment of the present invention will be described below based on the drawings. As shown in FIGS. 1 and 2, a rotary shaft 12 integral with the rotor 10 of the compressor has bearings 1 in front and rear side housings 21 and 23.
8 and 19, and a pulley 14, which receives the rotational drive of the engine, is attached to the front end of the shaft.

A vane 16 is fitted into each of the plurality of vane grooves 15 of the rotor 10 so as to be able to move in and out.
The tip of the rotor 10 contacts the rotating sleeve 30 surrounding the rotor 10.

The rotating sleeve 30 is housed within the center housing 22, and a thin film-like air bearing chamber 40 is interposed between the two.

A rear cover 24 is fixed to the back surface of the rear side housing 23 via a gasket, and a discharge chamber 41 and a suction chamber 51 are provided in the rear cover.

The discharge chamber 41 communicates with a discharge hole 42 via a discharge valve 60, and the discharge hole communicates with a discharge side working chamber 43 between the rotor 10 and the rotating sleeve 30.

A vane groove back pressure communication hole 48 extending from the discharge chamber 41 to the bottom of the vane groove is provided to introduce discharge pressure into the vane groove 15 to facilitate the protrusion of the vane 16.

The suction chamber 51 communicates with the suction side working chamber on the opposite side via the suction hole 52.

Front and rear side housings 21, 23
An annular groove 26 is provided on the sliding surface with the rotating sleeve 30, and the non-lubricated sliding member 25 is fitted into the annular groove 26.

The bolt 27 passes through the thick part 28 of the center housing 22 and fastens the front and rear side housings 21, 23, the center housing 22, and the rear cover 24 in the axial direction.

As shown in FIG. 1, a discharge chamber 41 and a suction chamber 52
A high pressure hole 44 and a low pressure hole 5 extend from the rear side housing 23 to the end surface of the center housing 22.
4, and an inlet 71 and an outlet 72 extending axially from the end surface of the center housing 22 in contact with the high pressure hole and the low pressure hole, respectively.

The inflow port 71 and the outflow port 72 are opened in the shape of grooves on the inner peripheral surface of the center housing 22 and communicate with the high pressure hole 44 and the low pressure hole 54 of the rear side housing 23, respectively.

Since the contact area on the inner circumferential surface of the center housing 22 that the rotating sleeve 30 contacts is on the discharge side, the inlet 71 and the outlet 7 are connected to each other as shown in FIG.
2 at the beginning and end of the discharge side increases the air flow in the contact area.

However, if the position of the contact area can be determined from the beginning, the inlet and outlet are provided in accordance with the contact area.

Since the rotating sleeve 30 during high-speed rotation exerts a suction action on the inlet 71, the inlet 71 is not necessarily a high-pressure discharge chamber, or the maximum pressure in the discharge chamber partitioned by one adjacent vane immediately before ventilation. There is no need to connect it to the working chamber of the valve, and it may be connected to the atmosphere and external air can be sucked in from the inlet.

Since the air flowing through the contact area can enter the working chamber on the suction side from the end face of the rotating sleeve 30,
The outlet 72 may be omitted.

In such a rotary compressor, Figs.
As shown in the figure, independent circumferential grooves are continuously provided in the axial direction on the inner circumferential surface of the rotating sleeve 30, and by providing a plurality of vanes that can fit and slide in the grooves, the inner circumferential surface of the rotating sleeve 30 and each By increasing the contact area of the vane tip sliding surface, thereby increasing wear resistance, and by forcibly rotating the rotating sleeve from the time of startup due to the rotation of the rotor, and forming a hydrodynamic bearing in the air bearing chamber 40 more quickly. This has the effect of providing even smoother rotation.

The depth and width of the circumferential groove are determined in relation to the thickness of the rotating sleeve.

Further, as shown in FIG. 5, by providing grooves having a similar shape to the independent circumferential grooves on the outer surface of the rotor, the top clearance between the rotating sleeve and the rotor can be made constant.

In addition, the configuration shown in FIGS. 3 and 4 is effective in preventing the rotor, vanes, and rotating sleeve from shifting in the axial direction.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional front view of a vane type rotary compressor which is an embodiment of the present invention, Fig. 2 is a cross-sectional side view taken along the line A-A', and Fig. 3 is a diagram showing the inner circumferential surface of the rotary sleeve of the present invention and the tip of the vane. Cross-sectional view showing the contact state of sliding surfaces, No. 4
5 are sectional views showing other embodiments of the present invention. 10: Rotor, 15: Vane groove, 16: Vane, 22: Center housing, 30: Rotating sleeve.

Claims (1)

[Scope of Claims] 1. A rotary compressor comprising a rotary sleeve rotatably supported on a center housing, a rotor rotating at an eccentric position of the rotary sleeve, and a vane fitted into the rotor so as to be removable and removable, A rotary compressor, characterized in that an independent circumferential groove is continuously provided in the axial direction on the inner circumferential surface of the rotary sleeve, and a vane is slidably fitted into the groove. 2. The rotary compressor according to claim 1, wherein the independent circumferential groove has a substantially serrated cross section. 3. The rotary compressor according to claim 1, wherein a groove having a similar shape to the independent circumferential groove is provided on the outer surface of the rotor.