JPS59213979A - Device for fluidly supporting rotary sleeve in rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the contact between the inner peripheral surface of a center housing and the outer peripheral surface of a rotary sleeve due to instability at both ends of the rotary sleeve, by forming circumferentially extending guide grooves between the inner peripheral surface of the center housing and the outer peripheral surface of the rotary sleeve. CONSTITUTION:Guide grooves 74 extending peripherally from the starting end to the terminal end of the contact area are formed in both end parts of the discharge side inner peripheral surface of a center housing 22. When the rotary compressor is rotated, high-pressure air flows from an inlet port 71 in the starting end of the contact area, and flows into the center section through the guide grooves 74, so that the bearing load force on the contact area of an air-bearing chamber 40 is increased and as well, becomes uniform in the axial direction. With this arrangement, the rotary sleeve 30 is fluidly supported balanced horizontaly. The guide grooves may also formed in both ends of the rotary sleeve 30 and as well may be formed in both center housing 22 and rotary sleeve 30.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a rotating sleeve that is rotatably fitted to a center housing, a rotor that rotates at an eccentric position of the rotating sleeve, and a rotor that is fitted into and out of the rotor. The present invention relates to a fluid support device for a rotary sleeve used in a rotary compressor equipped with vanes, and more specifically,
The present invention relates to a fluid support device consisting of a thin air bearing chamber formed between a center housing and a rotating sleeve. A rotary compressor in which a rotating sleeve is supported by a fluid support device generates less heat and generates less 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
#Grant No. 56-162025). The pressure filter rotates with the rotating sleeve and prevents heat generation and wear caused by the sliding of the vane tip, so it can be used in automobile engines etc. that operate at a wide range of rotation speeds from low to high speeds. It can be said to be the most suitable supercharger. However, due to the high internal pressure on the discharge side, if the rotary sleeve moves toward the discharge side and comes into direct contact with the center housing, there is a risk that scuffing will occur at the contact location, resulting in poor rotation of the rotary sleeve.

It has become clear that when the rotating sleeve approaches the discharge side and contacts the center housing, the rotating sleeve does not make contact at one location on the inner circumferential surface of the center housing, but rather makes contact over a wide area.

Therefore, 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 air bearing chamber. Proposal to communicate with the pressure working chamber (patent application 1973)
8-28608). However, since the bearing load force in the air bearing chamber due to the air flowing in from the inlet is high at the center and small at both ends, there is a risk that the rotating sleeve may 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 Accomplishing the Problems> The device of the present invention provides technical means for achieving the above-mentioned objects by improving the inner circumferential surface of the center housing and the outer circumferential surface of the rotary sleeve, or both ends thereof. A guide groove extending in the circumferential direction is provided nearby. The guide groove allows the incoming air to circulate quickly. When the guide groove is provided in the contact area of the center housing, the incoming air quickly circulates around the contact area and then flows from the guide groove to the center.
The bearing loading forces in the air bearing chamber at both ends of the rotating sleeve are equalized. Therefore, both ends of the rotating sleeve are stable, and contact due to instability between the 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 inner circumferential surface of the center housing on the suction side. To prevent this, a guide groove is also provided on the inner circumferential surface of the center housing on the suction side to quickly circulate the air flowing through the contact area to the suction side, thereby reinforcing the bearing load force on the suction side of the air bearing chamber. This is desirable.

Furthermore, a guide groove covering the entire circumference is provided on the inner circumferential surface of the center housing, the outer circumferential surface of the rotating sleeve, or both,
The bearing load force in the air bearing chamber may be reinforced 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 explained based on embodiments shown in the drawings.

As shown in FIG. 1, the rotor lO of the rotary compressor is integrally fixed to the rotating shaft 12, and rotates in the direction of the arrow at the eccentric position of the rotating sleeve 30. Rotor 10 vane groove 15
A vane 16 is fitted in and out of the rotary sleeve 30, and the tip of the vane 16 contacts the inner circumferential surface of the rotating sleeve 30. Rotating sleeve 3
0 is rotatably fitted into the center housing 22, and an air bearing chamber 40 is formed between the two. The figure shows an exaggerated thickness of the air bearing chamber 40, but the actual thickness is O.
, it is very thin, less than 1 mm.

The adjacent vanes 16 form a working chamber 43, and the pressure in the working chamber increases as it moves from the suction side to the discharge side.
It reaches its maximum just before it connects with 1. An oil vent 44 is provided in the working chamber 43 or discharge chamber 41 having the maximum pressure. The inflow lower 1 is provided at the starting end of the contact area on the discharge side inner circumferential surface of the center housing 22 where the rotating sleeve 30 comes into contact, and an inflow path 45 from the oil air port 44 to the inflow lower 1 is provided. The inflow passage 45 passes through the interior of the housing, but is shown as passing through the outside for clarity. Note that in the case of a rotary compressor that is mainly used at high speeds, the rotary sleeve performs a suction action, so the inlet may be communicated with the atmosphere. Guide grooves 74 are formed on both ends of the discharge side inner circumferential surface of the center housing 22 and extend in the circumferential direction from the starting end to the terminal end of the contact area.

As shown in FIG.
8.18, and a pulley 14 that receives rotational drive from the engine is attached to the front shaft end. 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. Both ends of the discharge side inner circumferential surface of the center housing 22 are cut out to form a guide groove 74 . The guide groove becomes part of the air bearing chamber 40 between the center housing 22 and the rotating sleeve 3o in the contact area.

The guide groove 74 is not necessarily limited to both ends of the center housing 22, and may be provided at a position slightly shifted inward from both ends as shown in FIG.
Place it on the outside.

When the rotary compressor is rotated, high-pressure air flows in from the inflow lower 1 at the beginning of the contact area. Since the inflowing air quickly goes around the contact area via the guide groove 74 and flows from the guide groove 74 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 rotating sleeve 3o is fluidly supported in a well-balanced left and right direction, so even if the rotating sleeve 30 is pressed toward the contact area due to the high internal pressure, it does not come into contact with the contact area.

Since the amount of air from the inlet of the contact area to the position where the air bearing chamber receives the maximum pressure is large, the effect of the guide groove is not so necessary. Therefore, as shown in FIG. 4, from the position P where the air bearing chamber 40 receives the maximum pressure, the center housing 2
A guide groove 74 may be formed toward the end of the two contact areas. The function of the guide groove 74 to balance the left and right sides of the rotary sleeve 30 and prevent it from coming into contact with the contact area is substantially the same as that in FIG.

As shown in FIG. 5, if the guide groove 74 is provided on the suction side of the center housing 22, that is, on the opposite side of the contact area, the rotational speed of the engine that rotates the rotor 10 will suddenly fluctuate, causing abnormal forces on the rotating sleeve 30. Even if the rotating sleeve 30 moves, the high-pressure air flowing through the contact area quickly increases the bearing load force of the air bearing chamber 40 on the suction side and supports the left and right sides of the rotating sleeve 30 in a well-balanced manner. Contact with the inner circumferential surface on the suction side of 22 can be sufficiently prevented from eroding.

As shown in FIG. 6, when the guide groove 74 is provided all around the center housing 22, the bearing load force of the air bearing chamber 40 is reduced to the inner peripheral surface of the center housing discharge side of the rotary sleeve 30 in the same way as in the embodiment shown in FIG. This has the dual effect of preventing contact with the inner circumferential surface of the center housing suction side of the rotary sleeve 30, as in the embodiment shown in FIG. 5. In this case, instead of providing the guide groove 74 in the center housing, the guide groove 74 may be provided at or near both ends of the one-turn sleeve 30, as shown in FIG.
As shown in FIG. 8, guide grooves 74 may be provided in both the center housing 22 and the rotating sleeve 30.

The air volume groove 73 shown in FIGS. 1 and 2 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. Even if the rectangle is doubled on the left and right as shown in Figure 9, the first
It may be a single elongated rectangle as shown in FIG. 0, a Herringhorn shape as shown in FIG. 11, or a collection of elongated stripes as shown in FIG. 12. Further, in order to increase the bearing load force of the air bearing chamber, a herringbone-shaped gas accumulation groove may be provided in a part of the inner circumferential surface of the center housing, for example, on the contact area and the opposite side thereof, or on the entire circumference.

<Effects of the Invention> Since the device of the present invention is provided with guide grooves at the left and right ends of the air bearing chamber, the bearing load force in the axial direction becomes equal, 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, in the device of the present invention, an accident in which the rotating sleeve loses its left-right balance and comes into contact with the inner circumferential surface of the center housing is prevented. Accidents such as scuffing caused by contact between the center housing and the rotary sleeve and malfunction of rotation of the rotating sleeve are reduced compared to the past.

[Brief explanation of the drawing]

Fig. 1 is a view showing the end face of a rotary compressor equipped with an apparatus according to an embodiment of the invention, with the rear side housing removed, and Fig. 2 is a slightly reduced cross-sectional view taken along line II-II in Fig. 1. , FIG. 3 is a vertical cross-sectional view of a main part showing a guide groove of another embodiment, FIGS. 4 to 6 are views corresponding to FIG. 1 of another embodiment, and FIGS. 7 and 8 are 3 and FIGS. 9 to 12 are partially exploded views showing air reservoir grooves of different embodiments, respectively. 10: Rotor, 16: Vane, 22: Center housing, 30: Rotating sleeve, 4o: Air bearing chamber, 41: Discharge chamber, 43: Working chamber, 45: Inflow path, 71: Inlet, 7
4: Guide groove Applicant Nippon Piston Ring Co., Ltd. No. 1 Fig. 2 Fig. 5 Fig. 61-1

Claims (1)

[Scope of Claims] 1) A rotating device including a rotating sleeve rotatably fitted to a center housing, a rotor rotating at an eccentric position of the rotating sleeve, and a vane fitted to the rotor so as to be freely removable and removable. An auxiliary air bearing chamber formed between the center housing and the rotating sleeve in the compressor, and a contact area on the inner circumferential surface of the center housing discharge side where the rotating sleeve comes into contact due to internal high pressure. an inlet opening at the starting end of the fluid support device; and an inflow path leading from the atmosphere or a discharge chamber, or from a working chamber partitioned by two adjacent vanes immediately before ventilation into the discharge chamber, to the inlet. A rotating sleeve with a rotational pressure of W+1iIl, characterized in that guide grooves extending in the circumferential direction are provided at or near both ends of either or both of the inner circumferential surface of the center housing and the outer circumferential surface of the rotary sleeve. fluid support device. 2) The fluid support device for a rotating sleeve according to claim 1, wherein the guide groove is provided in a contact area of the inner circumferential surface on the discharge side of the center housing. 3) The fluid support device for a rotating sleeve according to claim 2, wherein the guide groove is provided from the position where the air bearing chamber in the contact area receives the maximum pressure to the end of the contact area. 4) The fluid support device for a rotating sleeve according to claim 1, wherein the guide groove is provided on the inner circumferential surface of the center housing on the suction side. 5) The fluid of the rotating sleeve according to claim 1, wherein the guide groove is provided over either or both of the entire circumference of the inner circumferential surface of the center housing and the entire circumference of the outer circumferential surface of the rotating sleeve. Support device.