JPS6179887A - Fluid supporting apparatus for rotary sleeve of rotary compressor - Google Patents

Abstract

PURPOSE:To improve the bearing load faculty when a rotary sleeve shifts to the discharge side by forming a plurality of inflow ports for the introduction of high pressure, onto an air bearing chamber in the contact region of the rotary sleeve. CONSTITUTION:On the suction side of an air bearing chamber 40 for supporting the rotary sleeve 30 of a vane type compressor, a plurality of grooves 73 for the air communication to a suction inlet 52 through a check valve 76 are formed in order to prevent the contact of a rotary sleeve with the wall surface of a center housing 22 on the suction side because of the variation of the number of revolution. While, on the discharge side of an air bearing chamber, an inflow port 71 for the communication to a working chamber immediately before discharge through a check valve 76 and an inflow passage 45 is formed in order to prevent the contact of a rotary sleeve with the wall surface of a center housing on the discharge side.

Description

[Detailed Description of the Invention] <Field of Application in Industry> The present invention relates to an improvement in a fluid support device for a rotating sleeve that is rotatably fitted into the center housing of a rotary pressure machine and rotates together with the vane. More specifically, the present invention relates to a device for fluidly supporting a rotating sleeve in a four-way air bearing chamber formed between a center housing and a rotating sleeve. Rotary compressors in which the rotating sleeve is supported by a fluid support device are suitable for superchargers in internal combustion engines, in particular in motor vehicle engines.

Prior art> A vane-type rotary compressor that supports a rotating sleeve with a compressible fluid such as air rotates together with the sleeve and prevents heat generation and wear caused by sliding of the vane tip. It can be said that it is ideal as a supercharger for automobile engines that operate at a wide range of rotation speeds from low to high speeds. 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.

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 peripheral surface of the center housing.

Since it became clear that contact occurs in a wide area, the inventor of the present application created an inlet at the beginning of the contact area in order to increase the air flow in the contact area and increase the bearing load force in the air bearing chamber. Proposal to provide an inlet and communicate the inlet with the atmosphere, a discharge chamber, or a maximum pressure working chamber (Patent Application No. 58-286)
No. 08). Furthermore, if the rotational speed of the internal combustion engine that drives the rotor suddenly fluctuates, the rotating sleeve may move abnormally and come into contact with the inner circumferential surface of the center housing on the suction side, resulting in uneven rotation. , a proposal to increase the bearing load force on the suction side of the air bearing chamber by carving an air reservoir groove on the suction side inner peripheral surface of the center housing (Japanese Patent Application No. 58)
-47258) was also done. However, when the air storage groove is provided, the bearing load force on the suction side of the air bearing chamber becomes too strong, making the support of the rotary sleeve unstable and causing the rotation of the rotary sleeve to become unsmooth.

OBJECTS OF THE INVENTION An object of the present invention is to provide a fluid support device for a rotating sleeve that eliminates the above-mentioned drawbacks of air reservoir grooves and utilizes only their advantages.

<Technical means to achieve the problem> As a technical means to achieve the above problem, multiple inlets are provided in the contact area on the discharge side to further increase the bearing load force on the discharge side, and an air storage groove increases the load force on the bearing. The reason is that it corresponds to the bearing load force on the suction side. In this case, it is desirable to provide an inward-opening reversal valve in the inflow path leading from the discharge chamber or the maximum pressure working chamber to its inlet. Furthermore, the air reservoir groove may be provided with a check valve and an inlet may be provided without or with a plurality of check valves.

<Example> The apparatus of the present invention will be explained based on embodiments shown in the drawings.

As shown in FIG. 1, a rotor 10 of a 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 in and out of the vane groove 15 of the rotor IO, and the tip of the vane 16 contacts the inner circumferential surface of the rotation sleeve 30.The zero-rotation sleeve 30 is rotatably fitted in the center housing 22, and both An air bearing chamber 40 is formed therebetween. Although the tail of the air bearing chamber 40 is exaggerated in FIG. 0, 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 suction side to the discharge side. It reaches its maximum just before passing. An oil gas 144 is provided in the working chamber 43 having the maximum pressure.The starting end of the contact area where the rotary sleeve 30 on the inner peripheral surface of the discharge side of the center housing 22 is about to come into contact and the point P where the air bearing chamber 40 receives the maximum pressure. Inflow lowers 1 are provided at three locations between the two.Inflow passages 45 extending from the oil vents 44 to each inflow lower 1 are provided in parallel, and each inflow passage 4 is provided in parallel.
5 is interposed with a check valve 76. Center housing 22
Three air grooves 73 are carved on the inner peripheral surface of the suction side, and an outflow path 55 is provided from each air groove 73 to the suction hole 52.
A check valve 76 is attached to each outflow path 55. Although the bramble inlet passage 45 and the outflow passage 55 pass through the inside of the housing, in order to make the figure easier to see, they are shown as passing through the outside with imaginary lines.

As shown in FIG.
8.19, 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 and a suction chamber 51 are provided in the rear cover. The suction chamber 51 communicates with a suction-side working chamber 53 via a suction hole 52 .

The air groove 73 on the suction side is connected to the suction hole 5 through the outflow passage 55.
2, the inlet passage 45 on the discharge side communicates with the air bearing chamber 40 between the center housing 22 and the rotating sleeve 30 via the inlet lower 1.

As shown in FIG. 3, the check valve 76 is provided only in the outflow path 55 from the air groove 73 on the suction side to the suction hole 52, and the check valve in the inflow path 45 from the air bleed port 44 to the inflow lower 1 is provided. May be omitted. The air reservoir groove 73 carved on the inner peripheral surface of the suction side of the center housing 22 may be a symmetrical groove that communicates with the outflow passage 55 and expands in the axial direction, as shown in FIGS. 4 to 7. For example, it can be of any shape. for example,
It may be a rectangular groove divided into right and left sides as shown in FIG. 4, a single rectangular groove extending left and right as shown in FIG. 5, a herringbone groove shown in FIG.

When the illustrated rotary compressor rotates, the working chamber 43 is at maximum pressure.
Alternatively, the high pressure air in the discharge chamber 41 flows into the air bearing chamber 40 through the inflow lower 1 in the contact area, increasing the bearing load force in the contact area. Then, the air flowing through the contact area flows into the suction side of the center housing 22 and increases the bearing load force on the suction side of the air bearing chamber 40 through the air storage groove 73. If the bearing load force or pressure of the air reservoir groove 73 becomes too large, the support of the rotating sleeve 30 becomes unstable, but if the bearing load force or pressure of the air reservoir groove 73 exceeds a predetermined limit, the check valve 76 Since the air reservoir groove 73 is opened, the bearing load force of the air reservoir groove 73 is always maintained within an appropriate range. Since the plurality of air reservoir grooves 73 communicate with each other via the outflow passage 55, the bearing load force or pressure of each air reservoir groove 73 becomes equal, and the bearing load force on the suction side of the air bearing chamber 40 is stabilized. .

Instead of providing an outflow path in the air groove 73 on the suction side, the eighth
As shown in the figure, a plurality of inlets may be provided to prevent the load force on the discharge side from decreasing. The two inflow lowers 1 are both in the contact area, but one of them opens at the beginning of the contact area. One air groove 73 and the other inflow lower 1 are located at positions corresponding to the other two vertices of an equilateral triangle with one apex being the inflow lower 1 at the starting end of the contact area. The two inflow lowers 1 are connected to the discharge chamber 41 via respective inflow passages 45,
Each inflow passage 45 is provided with a check valve 76 that opens toward the air bearing chamber 40 side. Therefore, even if the bearing load force due to the air groove 73 on the suction side is increased, high-pressure air flows from the discharge chamber 41 through the two inflow lowers 1 to the contact area side and enters the contact area of the rotating sleeve 30. prevent contact with Even if the pressure in the discharge chamber 41 decreases, the check valve 76 prevents backflow of air in the contact area and maintains the bearing load force on the contact area side.

<Effects of the Invention> As described above, in the device of the present invention in which a plurality of inflow ports are provided in the contact area, the bearing load force in the contact area is high, so even if the load force on the suction side due to the air reservoir groove increases. , there is little risk that the rotating sleeve will come into contact with the contact area.

In the device of the present invention in which the air reservoir groove is provided with an outflow path, the air reservoir groove is connected to the suction port via the check valve, so there is no risk that the bearing load force of the air reservoir groove will increase abnormally. , contact of the rotating sleeve with the inner circumferential surface on the discharge side of the center housing is prevented by the high pressure air flowing in from the inflow port, and on the other hand, contact with the inner circumferential surface on the suction side of the center housing is prevented by the air reservoir groove. It has the excellent effect of rotating smoothly without contacting either side of the center housing.

[Brief explanation of drawings]

Fig. 1 is a view showing an end face of a rotary compressor equipped with a device according to an embodiment of the present invention with the rear side housing removed, and Fig. 2 is a slightly reduced cross-section taken along line II-II in Fig. 1. Figure 3 is a diagram corresponding to Figure 1 of another embodiment, Figure 4 is a developed view of the air reservoir groove, and Figures 5 to 8 are equivalent to Figure 4 of another embodiment. This is a diagram. lO2 floater 1B: vane, 22: center housing, 30: rotating sleeve, 40: air bearing chamber, 4I: discharge chamber, 43: working chamber, 45: inflow path, 52: suction port, 5
5: Outflow channel, 71 2nd inlet, 73: Air groove, 78:
Check valve applicant Nippon Piston Ring Co., Ltd. No changes to the engraving 1 of the drawings) Figure 3 Figure 8 Procedural amendment (Method □ October 18, 1980)

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. In a compressor, a thin air bearing chamber formed between the center housing and the rotating sleeve and a contact on the inner circumferential surface of the center housing discharge side with which the rotating sleeve tends to come into contact due to internal high pressure. an inlet opening into the area, an inflow path leading from the atmosphere or a discharge chamber or a working chamber partitioned by two adjacent vanes immediately before the discharge chamber to the inlet, and a suction side peripheral surface of the center housing; 1. A fluid support device for a rotary sleeve of a rotary compressor, characterized in that a plurality of said inlets are provided at different positions in the circumferential direction, said fluid support device comprising an air reservoir groove provided in said inlet. 2) The fluid support device for a rotary sleeve of a rotary compressor according to claim 1, wherein one of the inlets is provided at the starting end of the contact area. 3) A fluid support device for a rotary sleeve of a rotary compressor according to claim 1 or 2, wherein the inflow path is provided with a check valve that opens inward. 4) Claim No. 4, characterized in that the one air groove and the two inlets provided at the starting end of the contact area and at other locations are located at the vertices of an equilateral triangle when viewed in the axial direction. A fluid support device for a rotating sleeve of a rotary compressor according to item 2 or 3. 5) Any one of claims 1 to 3, characterized in that the air reservoir groove is connected to the suction hole or the atmosphere through an outflow passage provided with a check valve that opens outward. A fluid support device for a rotating sleeve of a rotary compressor as described in .