JPS5968589A - Vane type compressor - Google Patents

Abstract

PURPOSE:To contrive to prevent the lubricating oil in a reservoir at the lower part of a case from being disturbed by discharge gas by a structure wherein the clearance between the upper half part of the outer peripheral surface of a pump housing and the inner peripheral surface of the case are made wider so as to make the larger amount of the discharge gas pass therebetween, while the lower half part is made narrower so as to make the smaller amount of the discharge gas as possible pass. CONSTITUTION:A great part of the discharge gas discharged in jet from a discharge port located in the nearly horizontal diametral line of the outer peripheral surface of the pump housing 2 is introduced in the clearance, which is formed as wide as possible at the upper half part of the pump housing 2, and then in a discharge chamber and consequently a small part of the discharge gas flows at the lower half part of the pump housing 2. Furthermore, the jet of the discharge gas flowing at the lower half part of the pump housing 2 subjects to the repeated throttlings and expansions by the labyrinth packing effect due to the repetition of raised parts 26 and recessed prats 28, both of which are formed on the lower half part of the pump housing 2, resulting in decreasing the amount of leakage at the lower half part. Consequently, the lubricating oil collected in the lower part of the case 1a is prevented from being disturbed by the discharge gas, resulting in enabling to obtain stable lubricating effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vane type compressor, and more particularly to a vane type compressor that prevents disturbance of lubricating oil separated at the lower part of the housing and provides stable lubrication.

As a refrigerant compressor for a vehicle air conditioner, a vane type compressor is generally used, which has a structure with a spacer and is suitable for high-speed rotation. A conventional 180-degree symmetrical double-chamber vane compressor will be described with reference to FIGS. 1 and 2. A pump housing 2 formed by a cam ring 2a, a front side block 2b, and a rear side block 2C is accommodated in the inner peripheral surface of the cylindrical case, and a front head 1b is circumscribed on the front end surface of the front side block 2b. The front is sealed. A cylindrical rotor 4 is fitted into the pump housing 2, and is fitted onto a rotating shaft 3 and has a plate-like plate 4b inserted into a plurality of radially provided slits 4a so as to be able to move forward and backward. A compression mechanism A is constructed by forming a 180-degree symmetrical double-chamber pump operating chamber 5 between the row 4 and an elliptical cam surface 2d formed on the inner circumferential surface of the cam ring 2a. The rotating shaft 3 is a front side block 2b and a rear side block 2c.
Front and rear bearing portions 6a are integrally formed with each other.
, 6b, and is maintained airtight by a shaft seal portion 7a in a seal chamber 7 formed in the front head 1b.

A rear suction chamber 8 is joined to the rear surface of the rear sight block 2c, and the rear suction chamber 8 is communicated with a front suction chamber 10 formed on the inner surface of the front head 1b through a communication passage 9 passing through the inside of the pump housing 2. , and communicates with an inlet 11 integrally formed at the rear of the case 1a. Also,
The rear suction chamber 8 and the front suction chamber 10 each include a rear suction hole 12 provided in the rear side block 2c and a front suction hole 1 provided in the front side block 2b.
3 communicates with the suction section of both pump working chambers 5. The discharge portions of both pump working chambers 5 are discharge holes that open approximately at the horizontal diameter line of the outer circumference of the pump housing 2.]
4 through the discharge valve 15, and the pump housing 2 through the gap between the outer circumference of the pump housing 2 and the inner surface of the case 1a.
It communicates with the discharge pressure chamber 16 at the rear. The discharge pressure chamber 16 is provided with a lubricating oil separator 17, and the discharge discharged into the discharge pressure chamber 16 passes through the lubricating oil separator 7 to separate the mixed lubricating oil, and is integrated into the rear part of the case 1a. It is supplied to the refrigeration circuit from a discharge port 18 formed in the refrigeration circuit. The front side block 2b and the rear sight block 2c are provided with front and rear lubricating oil supply holes 19 and 20 that communicate from their lower surfaces to the front and rear bearings 6a and 6b, respectively. Front and rear annular grooves 21.22 are cut on the end surface and contact the outer circumferential surface of the rotating shaft 3, and both of these annular grooves 21.22 communicate with the back pressure chamber 4C at the bottom of the sulin 1-4a of the rotor 4. .

In the vane type compressor 1 constructed as described above, when the rotary shaft 3 is rotated in conjunction with a vehicle engine etc. and the rotor 4 rotates, the vane 4b is rotated by the centrifugal force and the back pressure of the lubricating oil. It rotates while sliding forward and backward in sliding contact with the cam surface 2d on the inner peripheral surface, and in the suction stroke, as shown by the arrow in FIG. A portion of the refrigerant is introduced into the front suction chamber 10 through the communication M9 passing through the pump housing 2, cooling the shaft seal portion 7a and It is sucked into the suction part of the re-pump working chamber 5 through the suction hole 13. The sucked refrigerant is compressed in the compression stroke, and the discharge valve 15 is opened from the discharge hole 14 that opens on the diameter line of the outer circumference of the pump housing 2, and the refrigerant is discharged through the gap between the outer circumference of the pump housing 2 and the inner surface of the case 1a. The lubricating oil separator 17 is discharged into the discharge pressure chamber 16.
The mixed lubricating oil is separated from the refrigerant gas, and only the refrigerant gas is supplied to the refrigeration circuit through the discharge port 18.

The separated lubricating oil accumulates at the bottom of the case 1a, and receives the pressure of the discharge pressure chamber [6] from the bottom surface of the pump housing 2 and the case 1a.
Front and rear lubricant supply holes 1 through the gap with the inner surface
9. Raise 20, front and rear bearing parts 6a, 6b
Lubricate this area.

The front and rear annular grooves 21 of the rotor 4 pass through the slight clearance between the rotating shaft 3 and the bearings 6a and 6b.
．． 22, and then back pressure chamber 4C at the bottom of Surin 1-4a.
A back pressure is applied to the vane 4b leading to . Also, the front bearing part 6a
A part of the lubricating oil enters the seal chamber 7, lubricates the shaft seal portion 7a, flows into the front suction chamber 10, mixes with the suction refrigerant, and is sucked into the pump working chamber 5 through the front suction hole 12. ,
The sliding surface between the vane 4b and the pump housing 2 together with the lubricating oil that flows into the back pressure chamber 4C, applies back pressure to the vane 4b, lubricates between the vane 4b and the slit 4a, and enters the pump working chamber 5. After lubricating the refrigerant, it is mixed into the discharge pressure chamber 16.
The lubricating oil separator 17 separates the refrigerant from the refrigerant, and the lubricating oil accumulates in the lower part of the case, where the above-mentioned lubrication cycle is repeated.

By the way, the pump housing 2 is formed by tightening a cam link 2a, a front 1 side block 2b and a rear side block 2c with a plurality of through bolts 23, and the outer circumferential surface of the pump housing 2 is formed by a cam link 2a, a front 1 side block 2b and a rear side block 2c. 1
A plurality of thin concave surfaces 24 are formed to avoid the holes. The discharge gas discharged from the discharge hole 14 passes through the gap between the concave surface 24 and the inner surface of the case 1a and is guided to the discharge pressure chamber 16 at the rear. is substantially on a horizontal diameter line of the outer circumferential surface of the pump housing 2, and the plurality of concave surfaces 24 on the outer circumferential surface of the pump housing 2 are arranged substantially vertically symmetrically with respect to this horizontal diameter line. Therefore, the discharge gas discharged from the discharge hole 14 is almost equally distributed vertically and flows into the discharge pressure chamber 16 as shown by arrows in FIG. Therefore, the jet of discharged gas flowing from the discharge hole 14 and flowing down the lower half of the pump housing 2 disturbs the lubricating oil accumulated in the lower part of the case 2a, and supplies the lubricating oil to the front and rear of the front side block 2b and rear side block 2C. The lower surfaces of the holes 19 and 20 are raised above the lubricating oil level, preventing continuous lubricating oil supply.

The present invention aims to solve the above-mentioned problems, and in a vane compressor in which a pump housing having a compression mechanism inside is housed in a case, substantially the upper half of the outer peripheral surface of the pump housing is A protruding surface portion having a gap as wide as possible with the inner circumferential surface to communicate with the discharge pressure chamber, and the lower half of the dowel having a gap as narrow as possible with the inner circumferential surface of the case;
An appropriate number of concave portions with an appropriate space between them and the inner circumferential surface of the case are formed in parallel in the axial direction, and the space between the concave portions and the inner circumferential surface of the case is defined by a partition wall at the rear end of the pump housing. This blocks communication with the discharge pressure chamber and prevents the jet of discharge gas flowing from the discharge hole to the outer periphery of the upper end of the pump housing from disturbing the lubricating oil accumulated at the bottom of the case, ensuring good lubrication. The present invention provides a vane type compressor.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In FIGS. 3 and 4, components corresponding to those of the conventional vane compressor shown in FIGS. 1 and 2 are designated by the same reference numerals. In the present invention, substantially the upper half of the outer peripheral surface of the pump housing 2 is communicated with the discharge pressure chamber 16 by forming a gap as wide as possible with the inner peripheral surface of the case 1a. For example, the center of the pump housing 2 may be lowered slightly relative to the center of the case 1a, and the concave surface 2 between the through bolts 23 that fasten the pump housing 2 may be lowered.
This is done by making the outer circumferential surface of the rear side flock 2c and the rear suction chamber 8 have approximately the same shape as the outer circumferential surface of the upper half of the pump housing 2. On the other hand, substantially the lower half of the outer peripheral surface of the pump housing 2 has a gap 25 as narrow as possible between it and the inner peripheral surface of the case 1a.
An appropriate number of protruding surface portions 2G having a space 2G and concave portions 28 having an appropriate space 27 between them and the inner circumferential surface of the case la are alternately formed in parallel in the axial direction to provide a function as a labyrinth packing. . Note that the protruding surface portion 26 is connected to the pump housing 2.
The gap 25 is provided by making effective use of the boss part for the through bolt 23 that fastens the pump housing 2, and the gap 25 is located between the center of the pump housing 2 and the center of the case 1a in order to widen the gap in the upper half of the pump housing 2. It is effectively formed in combination with slightly lowering. Further, the inside of the protruding surface portion 26 formed between the bolt holes of the through holes 1 to 23 is cut out to be effectively used as a communication passage 9' between the front and rear suction chambers 10 and 8.

In order to block communication between the space 27 between the concave surface portion 28 and the inner peripheral surface of the case 1a and the discharge pressure chamber 16, the rear suction chamber 16
The outer circumferential surface of substantially the lower half of the case 1a is shaped like an arc along the inner circumferential surface of the case 1a, except for the lubricating oil passage 29 at the bottom, and forms a partition wall 30 of the space 27.

That is, the outer peripheral surface of the rear suction chamber 8 has the same shape as the outer peripheral surface of the upper half of the pump housing 2, and the lower half has the same shape as the inner peripheral surface of the case 1a, except for the lubricating oil passage 29 at the bottom. It is arranged in the shape of a circular arc along the Note that the shape of the outer peripheral surface of the rear suction chamber 8, which allows discharge gas to flow into the discharge pressure chamber 16 in the upper half of the pump housing 2 and prevents it from flowing into the discharge pressure chamber 16 in the lower half, is similar to that of the rear side block 2c. It may be applied to the outer peripheral surface of the. The configuration other than the above is the same as that of the conventional vane compressor, so the explanation will be omitted.

In this vane compressor configured as follows,
Most of the discharged gas discharged in the form of a jet from the discharge hole 14 located on the approximately horizontal diameter line 2 on the outer peripheral surface of the pump housing 2 flows into the gap in the upper half of the pump housing sink 2, which is formed as wide as possible. The discharge gas that is guided into the discharge pressure chamber 16 and flows into the lower half of the pump housing 2 is reduced. The jet of discharged gas flowing into the lower half of the pump housing 2 is directed to the projecting surface 2 formed in the lower half of the pump housing 2.
Due to the labyrinth packing effect caused by the repetition of 6 and the concave surface portion 28, throttling and expansion are repeated, the amount of leakage is further reduced, and disturbance of the lubricating oil accumulated in the lower part of the case 1a is prevented. The discharged gas that has flowed into the discharge pressure chamber 16 through the gap in the upper half of the pump housing 2 passes through a lubricant oil separator 17 to separate the lubricating oil that was mixed therein, and is then supplied to the refrigeration circuit from the discharge port 18. The separated lubricating oil is stored in the lower part of the case 1a, and receives the pressure of the discharge pressure chamber 16 without being disturbed by the jet of discharged gas through the lubricating oil supply holes 19.2 at the front and rear.
0 and a lubrication cycle similar to that described for the conventional vane compressor is repeated.

As mentioned above, in this vane type compressor, the approximately two-half part of the outer peripheral surface of the pump housing of the vane type compressor is formed with as wide a gap as possible between the inner peripheral surface of the case and the discharge pressure chamber. The lower half of the dowel has an appropriate number of protruding parts that have the narrowest possible gap between them and the inner circumferential surface of the case, and concave parts that have an appropriate space between them and the inner circumferential surface of the case. Formed in parallel in the axial direction,
The space between the concave surface and the inner circumferential surface of the case is blocked from communicating with the discharge pressure chamber by a partition wall at the rear end of the pump housing, so that the discharge gas flowing into the lower half of the pump housing flows between the convex surface and the concave surface. This is mostly prevented by the labyrinth packing effect caused by repetition.

Therefore, the lubricating oil accumulated at the bottom of the case 1a is prevented from being disturbed by the discharged gas, and the lubricating oil supply hole rises above the lubricating oil surface, and the lubricating oil is stabilized without discontinuity caused by refrigerant gas mixed into the lubricating oil. A lubricating effect can be obtained. In addition, when the lubricating oil decreases and the curved surface lowers and is more susceptible to disturbance from the discharged gas, more of the protruding and concave surfaces are exposed from the curved surface as labyrinth packing, which increases the effect of preventing disturbance of the lubricating oil. It also has an adjustment function.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional 180-degree symmetrical double-chamber vane compressor, with Figure 1 being a vertical sectional view, Figure 2 being a sectional view taken along the line T-1 in Figure 1, and Figure 3 being a sectional view taken along the line T-1 in Figure 1. 3 and 4 show an embodiment of the present invention, FIG. 3 is a vertical longitudinal sectional view partially shown in side view, and FIG. 4 is a sectional view taken along line nn in FIG. 3. 1a... Case, 1h... Freon 1-head, 2 Pump housing, 2a... Cam ring, 2b... Front side block, 2C... Rear sight block, 3...
Rotating shaft, 4... Rotor, 4b... Vane, 5... Pump operation chamber, 8 - Rear suction chamber, 9 Communication passage, 11...
Suction port, 12... Rear intake hole, 13... Front intake hole,
14...Discharge hole, 16...Discharge pressure chamber, 18...Discharge port, 19...Front lubricating oil supply hole, 20...Rear lubricating oil supply hole, 24.24'...Concave surface , 25... gap,
26... Protruding surface part, 27... Space, 28... Concave surface part, 2
9... Lubricating oil passage, 30... Partition wall, A. Compression mechanism Figure 1 Heater 2 Figure b Figure 3 4-h

Claims (1)

[Claims] 1. In a vane compressor in which a pump housing having a compression mechanism inside is housed in a case, substantially the upper half of the outer peripheral surface of the pump housing has a gap with the inner peripheral surface of the case. An appropriate space is formed between the protruding surface part and the case circumferential surface, which is formed as wide as possible to communicate with the discharge pressure chamber, and the lower half of the dome has as narrow a gap as possible between it and the inner circumferential surface of the case. A suitable number of concave portions are formed alternately in parallel in the axial direction, and the space between the concave portions and the inner circumferential surface of the case is blocked from communicating with the discharge pressure chamber by a partition wall at the rear end of the pump housing. A vane type compressor featuring: 2. The partition wall that blocks the space between the concave surface formed in the lower half of the outer peripheral surface of the pump housing and the inner peripheral surface of the case from the discharge pressure chamber at the rear end of the pump housing is a rear side block or a rear suction wall. Vane type compression according to claim 1, characterized in that the lower half of the outer peripheral surface of the chamber is formed into a circular arc shape along the inner peripheral surface of the case, except for the lubricating oil passage provided at the lowest part. Machine.