JPH034759B2 - - 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 the improvement of compressors.

A vane-type rotary compressor has a rotating sleeve interposed between the rotor and center housing, supports the rotating sleeve with compressible fluid such as air, and rotates together with the vane. This eliminates the sliding of the vane tip and the accompanying friction. It is suitable as a supercharger for automobile engines, etc., which are operated at a wide range of rotation speeds from low to high speeds. However, if the rotary sleeve moves toward the discharge side and contacts the center housing due to the pressure in the internal working chamber on the discharge side, scuffing may occur at the contact location, which may impede the rotation of the rotary sleeve. When we investigated the movement of the rotating sleeve toward the discharge side, we found that the rotating sleeve does not move linearly toward the discharge side, but moves toward the discharge side while its center draws a circle. From this, it has been found that the outer circumferential surface of the rotating sleeve does not come into contact with the inner circumferential surface of the center housing at one location, but rather in a wide area. Furthermore, it was found that this contact area depends on the number of vanes, the position of the ports, etc. For example, in the case of four vanes, if one vane straddles the discharge port,
The front and rear working chambers of the vane communicate with each other, and the pressure in the front working chamber, which had been at its highest until then, now communicates with the rear working chamber, causing a sudden drop in pressure. At that time,
Due to the abnormal movement of the rotating sleeve, contact with the center housing also occurs, but the area of contact is in the area of the working chambers before and after the vane.

An object of the present invention is to provide an improved rotary compressor in which the rotary sleeve does not come into contact with the inner circumferential surface of the center housing even when the rotary sleeve is pressed toward the discharge side due to the pressure in the internal discharge-side working chamber. .

In order to achieve the above object, the rotary compressor of the present invention is provided with an inlet in the inner peripheral surface of the center housing that communicates with the atmosphere, a discharge chamber, or a working chamber partitioned by two adjacent vanes immediately before ventilation in the discharge chamber. Air flows into the air bearing chamber between the center housing and the rotating sleeve, and an air storage groove is provided at the end of the contact area on the inner peripheral surface of the center housing where the rotating sleeve contacts, further increasing the amount of air flowing through the contact area. By increasing the air bearing effect, the rotating sleeve is prevented from coming into contact with the inner peripheral surface of the center housing.

The rotary compressed air of the present invention will be explained based on an embodiment shown in the drawings. As shown in Figures 1 and 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 a pulley 14 that 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 removable and removable, and the tip of the vane 16 contacts a 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. Discharge chamber 4
1 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. The suction chamber 51 communicates with a suction side actuator 53 on the opposite side via a suction hole 52 . Front and rear side housings 21, 2
An annular groove 26 is provided on the sliding surface with the rotating sleeve 30 of No. 3, and the non-lubricated sliding member 25 is fitted into the annular groove 26. The bolt 27 is attached to the thick part 28 of the center housing 22.
through the front and rear housings 21, 2
3. Tighten the center housing 22 and rear cover 24 in the axial direction.

As shown in FIG. 2, a discharge chamber 41 and a suction chamber 52
A high-pressure hole 44 is bored through the rear side housing 23 to the end surface of the center housing 22.
An inlet 71 is provided that extends in the axial direction from the end surface of the center housing 22 in contact with the high pressure hole. The inlet 71 opens in the shape of a groove on the inner peripheral surface of the center housing 22 and connects to the high pressure hole 44 of the rear side housing 23.
communicate with. 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, if the inlet 71 is provided at the starting end 81 on the discharge side as shown in FIG. 3, the air flow in the contact area is increases.

Since the rotating sleeve 30 during high-speed rotation exerts a suction action on the inlet 71, the inlet 71 does not necessarily have to be a high-pressure discharge chamber 41 or a maximum space in the discharge chamber partitioned by two adjacent vanes 16 immediately before ventilation. It is not necessary to connect to the pressure working chamber 43, and it may be connected to the atmosphere and external air may be sucked in from the inlet. 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, but an air reservoir groove 7 shown in FIG. 4 is provided at the end of the contact area shown in FIG.
22 is provided to increase the pressure at this location to increase the loading force and better support the rotating sleeve 30.

The inlet 71 is manufactured in the form of an elongated rectangular groove as shown in FIG. 5, an isosceles triangular groove as shown in FIG. 6, or a groove as shown in FIG. Make it into a zigzag groove shape as shown, or
Alternatively, it is preferable to use a long rectangular groove with a land portion 711 in the center as shown in FIGS. 8 and 9, which communicates with a blind hole provided in the axial direction. It is also possible to form a hole with a plurality of ejection holes.

When the rotary compressor is operated, the working chamber 4 on the discharge side
3 becomes high pressure and presses the rotating sleeve 30 toward the discharge side. Since this pressing force changes depending on the position of the vane 16, the center of the rotating sleeve 30 forms a circle, and the outer circumferential surface attempts to contact the inner circumferential surface of the center housing 22 in the contact area on the discharge side, but the end of the contact area Due to the presence of the air reservoir groove 722 at 82, the increased air flow due to the external air drawn in from the inlet 71 further increases the air bearing loading force in the contact area of the air bearing chamber 40. As a result, the rotating sleeve 30 is supported in the air bearing chamber 40 with increased loading forces in the contact area, so that the center housing 2
It rotates smoothly without contacting the inner circumferential surface of 2.

As mentioned above, in the rotary compressor of the present invention, even when the rotary sleeve moves toward the discharge side, since there is an air storage groove at the end of the contact area, the air sucked from the inflow port absorbs the load force in the contact area of the air bearing chamber. Since contact between the outer circumferential surface of the rotating sleeve and the inner circumferential surface of the center housing is further increased, there is no possibility of scuffing occurring.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of the rotary compressor of FIG. 1, and FIG.
The figure shows the cross section taken along the - line in Figure 2 rotated by 90 degrees, Figure 4 is a partially exploded view of the center housing, and Figures 5 to 9 are views corresponding to Figure 4 of other embodiments. It is. 10: Rotor, 16: Vane, 22: Center housing, 30: Rotating sleeve, 40: Air bearing chamber, 41: Discharge chamber, 51: Suction chamber, 71: Inlet, 722: Air groove, 81: Discharge side starting end , 8
2: Discharge side end.

Claims (1)

[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,
An inlet is provided on the inner circumferential surface of the center housing to communicate with the atmosphere, a discharge chamber, or a working chamber partitioned by two adjacent vanes immediately before ventilation in the discharge chamber, and through the inlet, the center housing and the Air is introduced into the air bearing chamber formed between the rotating sleeves to increase the air flow in the contact area of the inner circumferential surface of the center housing where the rotating sleeves are about to come into contact, and to reduce the amount of air flowing through the contact area. A rotary compressor characterized in that a groove for storing air is provided at the end of the contact area.