JPS647229B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a rotating sleeve rotatably fitted to a center housing, a rotor rotating at an eccentric position of the rotating sleeve, and a rotor fitted to the rotor so as to be freely removable and removable. The invention relates to a support device for a rotary sleeve used in a rotary compressor equipped with vanes, and more specifically, a fluid bearing chamber consisting of a thin air bearing chamber formed between a center housing and a rotary sleeve. This relates to a support device.
A rotary compressor in which a rotating sleeve is supported by a fluid support device generates less heat and friction loss during high-speed rotation, and is therefore suitable for internal combustion engines, particularly superchargers for automobile engines.

<Prior art> The inventor of the present application 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 compressible fluid such as air (Japanese Patent Laid-Open No. 58-65988)
Did. The compressor uses a rotating sleeve that rotates with the vanes to prevent heat generation and wear caused by the sliding of the vane tips, so it is 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, due to the high internal pressure on the discharge side, if the rotary sleeve moves toward the high pressure side and comes into direct contact with the center housing, scuffing may occur at the contact point, which may result in poor rotation of the rotary sleeve.

When the rotating sleeve approaches the high pressure side and contacts the center housing, the rotating sleeve does not make contact at one location on the inner peripheral surface of the center housing;
It has become clear that contact occurs in a wide area.
This area is referred to as the contact area here, and the contact area is included in the high-pressure side half of the inner peripheral surface of the center housing, and when viewed in the rotation direction, its starting end is behind the starting end of the high-pressure side half, and its terminal end is It is located in front of the end of the high pressure side half circumference. In order to increase the air flow in the contact area and increase the bearing load force in the air bearing chamber, the inventor of the present application provided an inlet at the starting end of the contact area, and connected the inlet to the atmosphere or the discharge chamber or the maximum pressure. Proposal to communicate with the working chamber of
Publication No.). It is more effective to increase the bearing load force by placing the inlet inward in the axial direction of the air bearing chamber, but in that case, the bearing load force in the air bearing chamber due to the air flowing from the inlet is higher in the center. Since both ends were small, there was a risk that the rotating sleeve would become unstable at both ends.

<Problem of the Invention> An object of the present invention is to provide a fluid support device in which both ends of a rotating sleeve do not become unstable even when the bearing load force is increased by causing air to flow into the air bearing chamber.

<Technical means for achieving the object> As a technical means for achieving the object, the device of the present invention is provided with guide grooves extending in the circumferential direction at both ends of the air bearing chamber in the axial direction. communicates with the discharge chamber or with the working chamber partitioned by two adjacent vanes immediately before ventilation. The guide groove is formed on the inner circumferential surface of the center housing, the outer circumferential surface of the rotating sleeve, or the inner circumferential surface of the center housing and the outer circumferential surface of the rotating sleeve. The guide groove allows the incoming air to circulate quickly. If a guide groove is provided on the high-pressure side half of the center housing, the incoming air will quickly go around the high-pressure side half and then flow from the guide groove to the center, so the bearing load force in the air bearing chamber at both ends of the rotating sleeve will be become even. Therefore, both ends of the rotating sleeve are stable, so
Contact due to instability of both ends of the rotating sleeve is prevented.

If the rotational speed of the engine that drives the rotary compressor suddenly changes, the rotary sleeve may exhibit abnormal movement and come into contact with the low-pressure side inner circumferential surface of the center housing. In order to prevent this, a guide groove is also provided on the inner peripheral surface of the low pressure side of the center housing.
It is desirable to quickly circulate the air flowing through the contact area to the low pressure side to reinforce the bearing load force on the low pressure side of the air bearing chamber.

Furthermore, a guide groove extending over the entire circumference may be provided on the inner circumferential surface of the center housing, the outer circumferential surface of the rotating sleeve, or both, thereby reinforcing the bearing load force of the air bearing chamber over the entire circumference. A guide groove covering the entire circumference also has the advantage of being easier to work with than a partial guide groove.

<Example> The apparatus of the present invention will be described based on an example shown in the drawings. As shown in FIG. 1, a rotor 10 of the rotary compressor is integrally fixed to a rotating shaft 12, and rotates in the direction of the arrow at an eccentric position of a rotating sleeve 30. A vane 16 is fitted into the vane groove 15 of the rotor 10 so as to be freely removable and removable, and the tip of the vane 16 is in contact with the inner circumferential surface of the rotating sleeve 30. The rotating sleeve 30 is rotatably fitted into the center housing 22,
An air bearing chamber 40 is formed between the two. Although the figure shows the thickness of the air bearing chamber 40 in an exaggerated manner,
The actual thickness is very thin, less than 0.1 mm.

The two adjacent vanes 16 form a working chamber 43, and the pressure in the working chamber increases as it moves from the low-pressure side to the high-pressure side, and the working chamber 43 communicates with the discharge chamber 41 through the discharge hole 42. It reaches its maximum just before. An air bleed port 44 is provided in the working chamber 43 or the discharge chamber 41 having the maximum pressure. As mentioned earlier,
The area on the high-pressure side half circumference of the center housing 22 that the rotating sleeve 30 tries to contact, that is, the contact area, is inside the high-pressure side half circumference, and when viewed in the rotation direction, its starting end is closer to the starting end of the high-pressure side half circumference of the center housing 22. It is located a little behind, and its end is a little forward of the end of the high-pressure side half circumference. At both axial ends of the discharge side inner peripheral surface of the center housing 22, guide grooves 74 are provided that extend in the circumferential direction from the starting end to the terminal end of the contact area. An inlet 71 is provided at the starting end of the guide groove 74, and the inlet 71 and the air extraction port 4
An inflow path 45 is provided to connect the two. The inlet passage 45 passes through the inside of the housing, but for easy visibility,
The figure shows it as passing through the outside. One or more air grooves 7 are provided on the inner peripheral surface of the center housing 22.
3 is provided.

The vane 16 is connected to the discharge hole 42 from the inlet of the contact area.
Since there is a large amount of air up to the position just before the air bearing chamber receives the maximum pressure, the effect of the guide groove is not so necessary. Therefore, as shown in FIG. 2, a guide groove 74 may be provided from the position P where the air bearing chamber 40 receives the maximum pressure to the end of the contact area of the center housing 22. Guide groove 7
An inlet 71 provided at the starting end of the discharge chamber 4 and a bleed port 44 provided in the discharge chamber 41 are connected by an inlet 45 . As shown in FIG. 3, the rotor 10 has a rotating shaft 12 supported by bearings 18 and 19 of 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 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 an inlet 71 that opens on the high-pressure side inner circumferential surface of the center housing 22 via an inflow path 45 . The air reservoir groove 73 is provided on the inner circumferential surface of the center housing 22 on the low pressure side.

The guide groove 74 may be formed by cutting both ends of the center housing 22, as shown in FIG.
Alternatively, as shown in FIG. 5, it is carved at a position slightly shifted inward from both ends of the center housing 22.

When the rotary compressor shown in FIGS. 1 to 5 is rotated, high-pressure air flows in from the inlet 71 of the guide groove 74 in the contact area. The inflowing air passes through the guide groove 74, quickly goes around the contact area, and then continues through the guide groove 7.
4 to the center, the bearing load force in the contact area of the air bearing chamber 40 increases and becomes uniform in the axial direction. As a result, the rotary sleeve 30 is fluidly supported in a well-balanced left and right direction, so even if the rotary sleeve 30 is pushed toward the contact area due to internal high pressure, the rotary sleeve 30 does not come into contact with the inner circumferential surface of the center housing 22. Not enough.

As shown in FIG. 6, the center housing 22
A guide groove 74 is provided on the low pressure side of the
An inlet 71 provided at the starting end of the guide groove 74 via an inflow path 45 and an air bleed port 4 provided in the discharge chamber 41.
4, even if the rotational speed of the engine that rotates the rotor 10 suddenly fluctuates and the rotating sleeve 30 moves abnormally, the high-pressure air flowing through the contact area is immediately transferred to the air bearing chamber 40 on the low-pressure side. Since the bearing load force is increased and the right and left sides of the rotating sleeve 30 are supported in a well-balanced manner, it is possible to sufficiently prevent the rotating sleeve 30 from coming into contact with the low-pressure side inner circumferential surface of the center housing 22.

As shown in FIG. 7, a guide groove 74 is carved around the entire circumference of the center housing 22, and a working chamber 43 with maximum pressure is
from the air bleed port 44 to the guide groove 74 via the inlet passage 45.
When high-pressure air flows into the inlet 71 near the starting end of the contact area, the bearing load force in the air bearing chamber 40 becomes the first
Similarly to the embodiment shown in FIGS. 3 to 3, contact between the rotary sleeve 30 and the inner circumferential surface of the center housing on the discharge side is prevented, and similarly to the embodiment of FIG. It has the dual effect of preventing contact with surfaces. In this case, the guide grooves 74 may be provided at or near both ends of the rotating sleeve 30, as shown in FIG. 8, or between the center housing 22 and the rotating sleeve 30, as shown in FIG.
The guide groove 74 may be provided in both.

The air reservoir groove 73 shown in FIGS. 1 and 3 has the effect of increasing the bearing load force of the air bearing chamber 40, but its shape may be any shape as long as it extends symmetrically in the axial direction of the center housing 22. For example, it may be an elongated rectangular groove 73 divided into left and right halves as shown in FIG. 10, a single elongated rectangular groove 73 shown in FIG. 11, or a herringbone-shaped groove 73 shown in FIG. It may be a collection of elongated grooves 73 shown in FIG. 13. Furthermore, in order to increase the bearing load force of the air bearing chamber, a part of the inner peripheral surface of the center housing, for example the contact area and the opposite side thereof,
Alternatively, a herringbone-shaped gas accumulation groove may be provided on the front periphery.

<Effects of the Invention> The device of the present invention is provided with guide grooves at both ends of the air bearing chamber in the axial direction, and high pressure air flows into the guide grooves, so that the bearing load force in the air bearing chamber increases and the shaft The bearing load force in the directions becomes even, and the rotating sleeve can be supported in a well-balanced manner on the left and right sides. Therefore, unlike conventional devices lacking guide grooves, the device of the present invention prevents the rotary sleeve from becoming unbalanced left and right and coming into contact with the inner circumferential surface of the center housing.
Accidents such as contact between the rotating sleeve and the center housing, causing scuffing, or malfunctioning rotation of the rotating sleeve, are less likely than in the past.

[Brief explanation of the drawing]

FIG. 1 is a view showing an end face of a rotary compressor equipped with a device according to one embodiment of the present invention with the rear side housing removed; FIG. 2 is a view corresponding to FIG. 1 of another embodiment;
Fig. 3 is a slightly reduced cross-sectional view taken along line - in Fig. 2, Fig. 4 is a sectional view taken along line - in Fig. 1, and Fig. 5 corresponds to Fig. 4 of another embodiment. Figures 6 and 7 correspond to Figure 1 of another embodiment, Figures 8 and 9 correspond to Figure 4 of another embodiment, and Figure 10. 1 to 13 are developed views of each embodiment of the air reservoir groove. 10: Rotor, 16: Vane, 22: Center housing, 30: Rotating sleeve, 40: Air bearing chamber, 41: Discharge chamber, 43: Working chamber, 45: Inflow passage, 71: Inflow port, 74: Guide groove.

Claims (1)

[Scope of Claims] 1. A rotary compression device comprising: a rotary sleeve rotatably fitted to 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. A fluid support device comprising a thin air bearing chamber formed between the center housing and the rotating sleeve, the fluid support device comprising a thin air bearing chamber formed between the center housing and the rotary sleeve, the fluid support device having a discharge chamber on the inner circumferential surface of the center housing or a fluid bearing chamber adjacent to the discharge chamber immediately before ventilation. An inlet is provided that communicates with the working chamber partitioned by the two matching vanes, and guide grooves extending in the circumferential direction are provided at both ends of the air bearing chamber in the axial direction, and the guide grooves are connected to the discharge outlet. A fluid support device for a rotary sleeve of a rotary compressor, characterized in that the chamber or the discharge chamber communicates with the working chamber partitioned by two adjacent vanes immediately before ventilation. 2. The fluid support device for a rotating sleeve according to claim 1, wherein the guide groove is carved on the inner circumferential surface of the center housing. 3. The fluid support device for a rotary sleeve according to claim 1, wherein the guide groove is carved on the outer peripheral surface of the rotary sleeve. 4. The fluid support device for a rotary sleeve according to claim 1, wherein the guide groove is formed on the inner circumferential surface of the center housing and the outer circumferential surface of the rotary sleeve.