JPS5815673Y2 - vane compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vane compressor for vehicle air conditioning.

In conventional vane compressors, the oil in the oil reservoir is sent to the sliding surfaces of the rotor, vanes, bearings, etc. to lubricate these sliding surfaces. Sufficient consideration has not been given to the lubrication of the sliding surface of the plate with the center housing, and as a result, there is a risk that the sliding surface may lack lubrication, causing abnormal wear or seizure. Ta.

The purpose of the present invention is to provide an improved vane compressor that can effectively lubricate the sliding surfaces between the end plate and the center housing to prevent seizure and abnormal wear. be.

Hereinafter, illustrated embodiments embodying the vane compressor of the present invention will be described in detail.

The outer shell of the compressor is composed of a cylindrical center housing 1, and a front housing 2 and a rear housing 3 that are joined to both front and rear end surfaces of the center housing 1, and the cylindrical hole of the center housing 1 is connected to the front housing 2.
It is formed eccentrically with respect to the center of the rear housing 3, and an iron sleeve 4 is fitted into the inner surface of the cylindrical hole.

Note that this sleeve 4 may be integrally formed with the center housing 1 itself.

Inside the housings 1, 2.3, front and rear end plates 56 formed in a disc shape are in close contact with the end surfaces of the sleeve 4 and the center housing 1, respectively. 3, and the front end plate 5 is fitted onto one end of a drive shaft 8 rotatably supported by the front housing 2 via a bearing 7 and fixed with a pin 9. , the rear end plate 6 is rotatably supported by the rear housing 3 via a bearing 10.

Therefore, the low pressure chamber 11 is surrounded by the housing 1.2.3#t front housing 2 and the front end plate 5, and the low pressure chamber 11 is surrounded by the rear housing 3 and the rear end plate 6. It is separated into a low pressure chamber 12 and a space surrounded by the sleeve 4 of the center housing 1, in which a cylindrical rotor 13 is mounted. It is housed eccentrically so that a part of the outer peripheral surface is in contact with the lower part of the inner peripheral surface of the sleeve 4 .

In this embodiment, the rotor 13 consists of rotor elements 18a divided into four equal parts, each rotor element 18a having its end face fixed in close contact with both end plates 5.6 by, for example, a through port 36.

Thus, a space surrounded by the outer circumferential surface of the rotor 13, the inner circumferential surface of the sleeve 4, and both end plates 5.6 serves as a compression chamber 14 for refrigerant gas, while the inner circumferential surface of the rotor 13 and both end plates 5. The space surrounded by 6 and 1 is the oil sump chamber 1.
It is said to be 5.

A guide groove 16 of a predetermined width is provided between the divided surfaces of each rotor element 18a constituting the rotor 13, and each guide groove 1
6, vanes 17 which are longer than this groove (in the radial direction) are slidably fitted into the end plates 5.6 with their axial end surfaces in close contact with both end plates 5.6, and the opposing vanes 17 The inner proximal end portions of the comrades are connected to each other by two ronds 18 and are integrated.

Each vane 17 has a sliding groove 19 at its outer tip, and a subvane 20 is slidably fitted into each sliding groove 19 with its axial end surface in close contact with both end plates 5.6. , and this subvane 20 is biased by a spring 21 housed in the groove bottom so that its tip comes into contact with the inner circumferential surface of the sleeve 4 with an appropriate contact force.

Each vane 17 slides with the rotation of the rotor 13, so that its base end side moves in and out of the oil reservoir chamber 15.

The compression chamber 14 communicates with a suction chamber 23 provided in the center housing 1 and having a suction hole 22 for return refrigerant through a number of suction ports 24 provided through the sleeve 4. The sleeve 4 is connected to a discharge hole 25 for the high-pressure refrigerant through a discharge port 26 extending through the sleeve 4 .

The drive shaft 8 is provided with an oil supply hole 27 having one end opened in the center of the oil reservoir chamber 15, and this oil supply hole 27 is connected to the front side through a through hole 28 provided through a boss portion of the end plate 5 on the front side. It communicates with the low pressure chamber 11 of.

There is an oil supply hole 29 in the center of the rear end plate 6.
is provided through the oil reservoir chamber 15 and the rear low pressure chamber 12 are communicated with each other.

Arc-shaped oil supply grooves 30.3 centered on the axis of the end plates 5.6 are provided along the circumferential direction on the sliding surfaces of the center housing 1 that come into contact with both end plates 5.6.
1 is provided over a range of approximately 180 degrees, and one end of each of the oil supply grooves 30 and 31 is communicated with the suction chamber 23 through a communication hole 32, respectively.

Further, on the sliding surface of the center housing 1 with the end plate 5.6, a large number of small grooves 33.34 are provided on the outside of the oil supply groove 30.310, one end of which opens into the oil supply groove 30.31. 33 and 34 are the inner wall surfaces of the front housing 2 and rear housing 3 and the end plate 5
．． They communicate with low pressure chambers 11 and 12, respectively, through gaps S formed between the outer circumferential edges of 6 and 6.

Here, as a modification of the oil supply groove 30.31, FIG.
The one shown in Figure 7 can be considered, but it is 11.111.

1iii to center housing, 4i 4ii 4i
ii is a sleeve, 13i, 13ii, 13iii are rotors (vanes are omitted), Ri, Ri i, Ri
Assuming that i is a circle indicating the outer peripheral edge of the end plate, in FIG. It is shown communicating with the low pressure chamber through a communication portion 50i extending to the end, and communicating with the suction chamber through a communication hole 32i at the other end, and in FIG. 6, the oil supply groove 30ii
is a communication portion 50ii provided along the entire outer end thereof.
The communication hole 32ii communicates with the low pressure chamber, and the communication hole 32ii communicates with the suction chamber. In addition, in FIG. Oil supply groove 30ii
i is the communication part 5 protruding outward from the circle R11i
0iii communicates with the low pressure chamber, and communication hole 32iii communicates with the suction chamber.

Note that 35 is a shaft seal. The vane compressor of this embodiment is constructed as described above, and as the compressor is started and the end plate 5.6 and rotor 13 are rotated together with the drive shaft 8 (clockwise in FIG. 1), When the vane 17 moves within the compression chamber 14, the return refrigerant flowing into the suction hole 22 from the external circuit is transferred to the suction chamber 14.
After flowing into the compression chamber 14 from 3 through the suction port 24,
As the volume of the compression chamber 14 is gradually reduced, the refrigerant is compressed and becomes a high-pressure refrigerant, which is discharged from the discharge port 26 to the discharge hole 25.
The signal is then sent to the external circuit.

In this case, as the rotor 13 rotates, the sub vane 20 is rotated by the spring 2.
1 and the centrifugal force, the vane 17 slides with its tip pressed against the inner peripheral surface of the sleeve 4, and the vane 17 also slides against the sub vane 2.
The sleeve 4 slides in response to the sliding motion of 0, and the sealing property between the inner circumferential surface of the sleeve 4 and the tip of the sub vane 20 is maintained well.

In the oil storage chamber 15, oil separated from the refrigerant gas or refrigerant gas with high oil density is collected near the peripheral wall due to the centrifugal force generated as the rotor 15 rotates, and the refrigerant gas with high oil density is collected near the center. The refrigerant gas with low oil density collects.

Therefore, when the vane 17 sliding in the guide groove 16 with the rotation of the rotor 13 thrusts its base end into the oil sump chamber 15, both sides of the vane 17, which are sliding surfaces with the rotor 13, are in the oil sump chamber. 15, so there is an oil reservoir chamber 1 on both sides.
There is a lot of oil near the wall of vane 17.
Fortunately, both end plates 5 slid on the compression chamber 14 side.
, 6 that slide against the end surfaces of the vanes 17 are partially exposed to the oil reservoir chamber 15, so that oil also adheres to the exposed portions.

Therefore, the sliding surfaces of the rotor 13 and the vane 17, the button, and the sliding surfaces of the end plates 5, 6 and the vane 17 are supplied with oil as the vane 17 slides, providing good lubrication.

Note that while the compressor is in operation, the pressure in the compression chamber 14 on the compression stroke side (right side in FIG. 1) is considerably higher than the pressure in the oil reservoir chamber 15, so the refrigerant in the compression chamber 14 A part of the gas flows into the oil sump chamber 1 from the sliding surface between the rotor 13 and the vane 17.
5, the suction stroke side where the residue flows (left side in Figure 1)
Since the pressure in the compression chamber 14 is slightly lower than the pressure in the oil reservoir chamber 15, the refrigerant gas in the oil reservoir chamber 15 flows into the compression chamber 14 from the sliding surface between the rotor 13 and the vane 17. The rotor 13 is also affected by the flow of refrigerant gas due to a pressure difference.
The sliding surfaces between the vane 17 and the vane 17 are lubricated.

On the other hand, since the pressure in the low pressure chambers 11 and 12 is lower than the pressure in the oil reservoir chamber 15, the refrigerant gas existing near the center of the oil reservoir chamber 15 flows into the oil supply hole 27 to the low pressure chamber 11.12. .29
The oil flows through the through hole 28 and is used to lubricate the bearings 7 and 10 and the shaft seal 35.

In addition, the pressure in the suction chamber 23 is lower than the pressure in the low pressure chambers 11'' and 12.
Since the pressure inside the low pressure chamber 11.12 is low, the refrigerant gas in the low pressure chamber 11.12 passes from the gap S through a number of small grooves 33.34 to the oil supply groove 30.
31, the refrigerant gas flows into the suction chamber 23 through the communication hole 32, and is again sucked into the compression chamber 14 together with the return refrigerant. Both end plates 5.6 rotate in contact with the center housing and sleeve 4.
As a result, the sliding surface is lubricated.

However, in the first embodiment, the center housing 1
A large number of small grooves 33 and 34 are provided in each of the grooves 33 and 34, and the end plates 5 and 6 face the small grooves 33 and 34, so that the refrigerant gas flows in the radial direction, so that it is evenly lubricated over a wide range of the sliding surface width. Furthermore, when the refrigerant gas flows through the small grooves 33, 34 and the oil supply grooves 30, 31, the large oil, which is more viscous than the gas, separates from the gas and collects on the wall side, so the number of grooves increases. If the amount of oil is increased, the amount of oil adhering to the sliding surface of the end plate 5.6 will be increased as much as possible, and as a result, the lubrication effect will be further improved.

In the illustrated embodiment, one oil supply groove 30, 31 is provided at each end of the center housing 10, but a plurality of oil grooves 30, 31 may be provided.

As detailed above, the present invention provides a vane type compressor with an arcuate or annular oil supply groove along the circumference in the sliding surface of the center housing and the end plate, and the front housing and rear housing. By introducing the refrigerant gas in the low pressure chamber into the suction chamber through the oil supply groove, the oil in the refrigerant gas flowing in the oil supply groove is actively supplied to the sliding surface, thereby preventing oil slippage on the iron surface. This greatly helps to prevent seizure and abnormal wear caused by insufficient lubrication and extend the life of the product.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front sectional view of a vane compressor (II sectional view in FIG. 2), FIG. 2 is a sectional view taken along ■--■ in FIG. The figure is a sectional view taken along the line ■-■ in Figure 1, Figure 4 is an explanatory diagram showing the distribution of oil in the refrigerant gas flowing in the small groove, and Figures 5 to 7 are explanatory diagrams showing modifications of the oil supply groove. It is. 1...Center housing, 2...Front housing, 3...Riano Uzing, 5
．． 6...End plate, 8...Drive shaft, 11.12...Low pressure chamber, 13...
Rotor, 17... Vane, 23... Suction chamber, 30.31... Oil supply groove, 33.34...
...71, Row-

Claims (2)

[Scope of utility model registration request] (1) In a space surrounded by a cylindrical center housing and front and rear end plates that are in close contact with both ends of the center housing and rotate together with the drive shaft, a plurality of A compressor in which a rotor having vanes is housed eccentrically so as to rotate together with the end plate, wherein an arcuate or annular oil supply groove is carved on the sliding surface of the center housing with the end plate, A vane type compressor characterized in that the oil supply groove communicates with a suction chamber of a center housing and low pressure chambers of a front housing and a rear housing arranged at both ends of the center housing. (2) The vane type compressor according to claim 1, wherein the oil supply groove is communicated with the low pressure chamber through a number of small grooves carved in the contact surface with the end plate of the center housing. .