JPS59185891A - Oil supply device for vane rotating system compressor - Google Patents

Abstract

PURPOSE:To prevent lubricating oil from leakage into a cylinder space by providing an oil supply groove communicating to a high pressure oil reservoir and provided in a portion with an oil supply interrupting portion on a rear side plate and providing a groove communicating to the back space of vane during the immersion and projection strokes and at the same time not communicating to the adjacent back space of vane. CONSTITUTION:A rear side plate 4 is provided with an oil supply groove 4a communicating to a vane back space 3a formed in the rear end of a vane slot 2a and an interrupting portion 4c for partially interrupting this oil supply groove to supply pressurized oil in a high pressure case 8 to this oil groove 4a. A front side plate 5 is provided with an oil groove 5a communicating to the vane back space 3a sandwiching an axial seal portion 9 and moving from the immersion stroke to the projecting stroke not to communicate to the adjacent vane back space 3a at the same time.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is applicable to compressors of vehicle cooling systems, which are driven by a drive source such as an automobile engine, and which are particularly frequently started and stopped and rotated at low speeds. The present invention relates to an oil supply device suitable for applying pressure to vanes in a vane rotary compressor that is started.

Conventional configurations and problems As is well known, in rotary vane compressors, high pressure is applied to the rear end of the vane so that the tip of the vane always rotates and slides in contact with the inner wall of the cylinder as the rotor rotates. A structure that applies lubricating oil is used.

One way to achieve this is to supply oil using a differential pressure method. A passage is provided that communicates the oil reservoir at the bottom of the high-pressure case of the compressor with the oil supply groove provided on the rear side plate, and the differential pressure is used to supply oil to the vanes. By supplying oil to the back space, a suppressing effect is exerted on the rear end of the vane, and the oil supply groove prevents a malfunction in which the tip of the vane separates from the inner wall of the cylinder at the boundary between high-pressure gas and low-pressure gas (hereinafter referred to as the axial seal portion). The vane has a partially separated structure that shuts off oil supply to the space behind the vane to prevent this from occurring, and this allows the vane tip to rotate and slide in constant contact with the inner wall of the cylinder during operation.

However, in the conventional compressor, oil is supplied to the back space of the vane using the pressure difference inside the compressor. However, the vane rear space was not sufficiently lubricated, and therefore the vane came loose from the cylinder inner wall and was forced into the vane slot, resulting in poor compression.

Of course, in this case, a centrifugal force acts on the vane according to its rotational speed, trying to make the vane protrude in the protruding direction, but this effect is extremely small in the low-speed rotation range (for example, 1000 rpm or less); The effect of centrifugal force cannot be expected in compressors for automotive refrigeration cycles, which often fail to start.

On the other hand, as a means to eliminate these drawbacks, there is a forced pump type oil supply, which uses a forced pump connected to the rotor shaft to pump oil into the oil supply groove on the rear side plate to push out the vane. In a compressor driven by an automobile engine, excessive pressure is applied to the space behind the vane by the forced pump in the high-speed rotation range, causing excessive friction loss at the sliding part between the vane tip and the cylinder inner wall, reducing the required power. It has the disadvantage of increasing.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the conventional vane rotary compressors mentioned above, and eliminates the use of forced pumps.
Stable operation is achieved when starting from an equal pressure state,
It is an object of the present invention to provide an oil supply device that applies pressure to the back of a vane of a vane rotary compressor with a small required power in a high-speed rotation range.

Structure of the Invention The oil supply device for a vane rotary compressor of the present invention includes an oil supply groove in a rear side plate that communicates with an oil reservoir at the bottom of a high-pressure case, and a partially separated structure that shuts off oil supply. An oil supply passage is formed to supply pressurized oil in the high-pressure case, and the axial seal part is sandwiched between the front side plate and communicates with the back space of the vane in the retraction stroke and the protrusion stroke. is provided with grooves that do not communicate at the same time.

With this configuration, the volume of the back of the vane during the retraction stroke communicates with the independent oil groove of the front side plate, increasing the volume of the back of the vane and reducing the internal pressure by lowering the rate of pressure rise during the retraction and protrusion strokes of the vane. This reduces the leakage of lubricating oil from the vane back volume into the cylinder space on the high pressure side (vane retraction stroke) and maintains the vane's pressing action on the low pressure side. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings. The vane rotary compressor of the present invention includes a cylinder 1 having a cylindrical inner wall, and A rotor 2 is arranged such that a part of its surface forms an axial seal part a with a small gap between it and the cylinder inner wall 1a, and the rotor 2 is inserted so as to be freely protrusive and retractable into a plurality of vane slots 2a provided in the rotor 2, and its tip end is connected to the cylinder. A plurality of vanes 3 in contact with the inner wall 1a, a front side plate 5 and a rear side plate 4 that rotatably support the shaft 6 of the rotor 2 and close both end faces of the cylinder 1 to form a cylinder space inside, and a cylinder inner space. It is constituted by a high pressure case 8 having an oil reservoir 8a at the bottom communicating with a discharge hole 7 having a discharge valve 7a which opens at the bottom thereof, and a discharge valve 7a for opening and closing the discharge hole. The rear side plate 4 has a vane throw) l□ 2 A vane back space 3 formed at the rear end of a.
A oil supply #4a that communicates with the oil supply groove A and a blocking portion 4c that partially blocks this oil supply groove are provided, and this oil supply groove 4a and the oil reservoir 8a at the bottom of the high pressure case 8 are communicated to maintain the pressure inside the high pressure case 8. A refueling passage 10 including an oil receptacle 4b that adds oil to the rear end of the vane 73 to project the vane 3 is provided, and the front side plate 6 is provided with an axial seal portion 9 between the axial seal portions 9 and the back of the vane in the retracting stroke to the protruding stroke. An oil groove 6a communicating with the space 3a is formed. The oil groove 5a is formed short so as not to communicate with the adjacent vane back space 3a at the same time, and faces the blocking portion 4C of the rear side plate 4.

In the above configuration, the lubricating oil in the oil reservoir 8a at the bottom of the high-pressure case 8 is supplied to the vane back space 3a in the rotor 2 through the oil supply groove 4a provided in the rear side plate 4. Also, as the rotor 2 rotates, the base 73 extends its tip to the inner wall of the cylinder.
It rotates and slides while touching a. In FIGS. 3 and 4, the vane 3 moves from the retracted stroke to the protruded stroke while sandwiching the axial seal portion 9, and in the previous stroke, the vane back space 3a decreases and is cut off from the oil supply groove 4a provided in the rear side plate 4. It communicates with an oil groove 5a provided in the front side plate 5 and made independent from the others by the rotor 2, and as the vane 3 retracts, the vane back volume and the pressure in the oil groove 5a of the front side plate 5 gradually increase. .

Then, the tip of the vane 73 passes through the axial seal part 9, and the pressure in the back volume of the vane decreases until part of the extension stroke LK <'<,, the vane 3 is pushed out on the low pressure side, and the tip of the vane 3 is It will slide while contacting the cylinder inner wall 1a.

As a result, the tip of the bee 73 does not come loose from the cylinder inner wall 1a at the axial seal portion 9, and even after passing through the axial seal portion, the rear end of the bee 73 remains in the oil groove 5a provided in the front side plate 5. The vane continues to be reliably pushed by the pressure, and even if the pressure in the oil supply hole 4a provided on the rear side plate 4 is low when starting from a uniform thickness state, the independent front side plate 50 oil groove 5a ensures a reliable protrusion action of the vane. is what works.

Effects of the Invention As is clear from the above embodiments, the oil supply device for a vane rotary compressor of the present invention has the following advantages: The start-up performance of the compressor from an equal pressure state is improved, and stable compression function can be obtained. As the vane retracts, the volume at the back of the vane decreases, which reduces lubricating oil within that volume from leaking into the cylinder, resulting in a reduction in power requirements and efficient compressor oil removal. Supply is made.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a vane rotary compressor showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same compressor, and Fig. 3 is a front side plate and a rear side plate of the compressor. It is an explanatory view showing a provided oil supply groove. 1... Cylinder, 1a... Cylinder inner wall, 2... Rotor, 2a... Vane slot, 3... Vane, 3a...・Vane back space, 4... Rear side plate, 4a... Oil supply, groove, 4C... Oil supply groove blocking part, 5...
・Front side plate, 6a...Oil groove, 7...Discharge hole, 8 High pressure case, 8a...Oil sump, 9...
Axial seal part, 10... Oil supply passage. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 tL

Claims (1)

[Claims] A cylinder having a cylindrical inner wall, a rotor arranged so that a part of its outer circumferential surface always forms an axial seal part with a small gap between the cylinder inner wall of the cylinder, and a plurality of vane slots provided in the rotor. a plurality of vanes that are inserted so as to be retractable and whose tips are in contact with the inner wall of the cylinder; a front side plate and a rear side plate that rotatably support the rotor and close both end surfaces of the cylinder to form a cylinder internal space; A compressor main body is constituted by a high pressure case having an oil reservoir at the bottom that communicates with a discharge hole opening into the cylinder inner space, and communicates with a vane back space formed at the rear end of the vane slot in the rear side plate. An oil supply groove and a blocking part that partially blocks the oil supply groove are provided, an oil supply passage is provided that communicates the oil supply groove with the oil reservoir at the bottom of the high pressure case, and the front side plate is provided with the axial seal part sandwiched therebetween. This oil supply device for a vane rotary compressor is provided with an oil groove that communicates with the vane back space of the vane in the retracted stroke and the protruded stroke, but does not communicate with the adjacent vane back space at the same time.