JP2003113787A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an O ring for sealing a space on the rear end face side of a rotor shaft. SOLUTION: A front side block 4 and a rear side block 5 are provided on both ends of a tubular cylinder 3, and a rotor rotatable by a rotor shaft 10 is arranged in the cylinder. A vane groove and a vane back-pressure chamber for reciprocatably accommodating the vane are formed to the rotor 6, and this compressor is equipped with a high-pressure chamber 15 and an oil retaining part 17, a lubricating oil space 35 on the rear end face side of a rotor shaft 10 in the rear side block 5, and an oil supply path 20 for supplying oil from the oil retaining part 17 to the oil accommodation space 35. An oil passage 40 for a vane back-pressure chamber, which is communicated with the oil accommodation space 35 on one end and with the vane back-pressure chamber 9 on the other end, is formed inside the rear side block 5 or the rotor shaft 10. A space on the rear end face side of the rotor shaft can be formed by the rear side block, and the O ring for sealing the high pressure chamber is eliminated for improving reliability. By eliminating the O ring, costs can be reduced and a man-hour of assembly can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor used as a part of an air conditioner for a vehicle or the like.

[0002]

2. Description of the Related Art A vane type compressor is known as a gas compressor used in a cooling device, a refrigerating device and the like. The gas compressor will be described with reference to FIG. A suction chamber 2 is formed inside one side of the casing 1, and a gas compression unit is provided adjacent to the suction chamber 2. In the gas compression section, a cylindrical cylinder 3 having a substantially elliptical inner peripheral surface in a vertical cross section orthogonal to the axial direction, and a front side block 4 and a rear side block 5 fixed in parallel to each other on both axial end surfaces thereof. Are arranged.

Inside the cylinder 3, a rotatable rotor 6 supported by a rotor shaft 10 is arranged as shown in FIG. The rotor 6 has a plurality (five in the figure).
7 are radially formed, and the vanes 8 ... 8 are slidably fitted in and held in the respective vane grooves 7. Further, a vane back pressure chamber 9 is formed in communication with an end portion of the vane groove 7 on the inner peripheral side, and oil is supplied to the vane back pressure chamber 9 to assist the forward and backward movement of the vane 8.

Further, as shown in FIG. 4, a cyclone block 14 for separating oil from compressed refrigerant gas is attached to the rear end side of the rear side block 5, and the rear side block 5 and the cyclone block 1 are attached.
A high pressure chamber 15 is formed in the rear of 4. Casing 1
Has a discharge port (not shown) formed so as to communicate with the high pressure chamber 15, and an oil sump 17 is provided at the bottom of the high pressure chamber 15. The refrigerant gas compressed in the cylinder 3 is discharged to the high pressure chamber 15 through the rear side block 5 and the cyclone block 14, and the high pressure refrigerant gas discharged into the high pressure chamber 15 is supplied to the outside through the discharge port. Further, the oil separated by the cyclone block 14 drops into the oil sump portion 17.

The discharge pressure of the high-pressure refrigerant gas discharged into the high-pressure chamber 15 acts on the oil in the oil sump 17, and the oil is accumulated in the cylinder 3, the front side block 4, and the rear side block 5 from the oil sump 17. Lubricating oil is supplied to the bearing portion of the rotor shaft 10 through the oil supply passages 20, 21 and 22 respectively formed, and the bearing portion is lubricated. Also,
The oil supplied to the bearing portions at the front and rear ends of the rotor shaft 10 is partially supplied to the small space 30 formed by the rear end surface of the rotor shaft 10 and the cyclone block 14 to prevent seizure of the rear end surface of the rotor shaft. . The oil supplied to this small space 30 is
Rear end face of rear side block 5 and cyclone block 1
The oil is supplied to one side of the salai groove 26 through the oil passage 23 formed in the rear side block 5 and the oil to the vane back pressure chamber 9.

The small space 30 at the rear end surface of the rotor shaft
Since it is formed by the rear side block 6 and the cyclone block 14 as described above, in order to block the small space 30 and the discharge pressure space outside the cyclone block 14, the small space 30 is surrounded by the rear side block 6. An O-ring 31 is arranged between the cyclone block 14 and the cyclone block 14 for sealing.

[0007]

However, the space at the rear end surface of the rotor shaft is filled with high temperature oil, and the discharge pressure space outside the cyclone block contains high temperature, high pressure gas or oil. However, the O-ring is apt to deteriorate due to heat, and there is a possibility that an appropriate vane back pressure cannot be maintained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compressor which eliminates the problems caused by deterioration of the O-ring by eliminating the need for installing an O-ring around a small space. To do.

[0009]

In order to solve the above problems, among the compressors according to the present invention, the compressor according to claim 1 is a cylinder having a cylindrical shape and a front side block at the axial end of the cylinder. And a rear side block, a rotor rotatably arranged in the cylinder, a vane groove provided in the rotor, and a vane back pressure chamber provided in communication with an inner peripheral side end portion of the vane groove, A vane housed in the vane groove so as to be able to move forward and backward, a rotor shaft that rotates the rotor, a high-pressure chamber from which compressed gas is discharged from the cylinder, oil is stored, and oil on which the pressure of the high-pressure chamber acts And a lubricating oil space on the rear end surface side of the rotor shaft in the rear side block, and an oil supply path for supplying oil from the oil collecting portion to the lubricating oil space, and Oil storage space One end vane back pressure chamber for oil passage that communicates with the is formed inside the rear side block within or rotor shaft, characterized in that the other end of the oil passage is communicated with the vane back-pressure chamber.

A gas compressor according to a second aspect is the gas compressor according to the first aspect, wherein a saray groove communicating with the vane back pressure chamber is formed on a front end surface of the rear side block, and the salai groove is provided with the saray groove. An oil passage is connected so that the oil passage communicates with the vane back pressure chamber.

According to a third aspect of the invention, in the gas compressor according to the first or second aspect, the vane back pressure oil passage is formed in the rotor shaft along the axial direction, and the oil passage is on the cylinder side. Is connected to the vane back pressure chamber by being deflected in the radial direction by a throttle valve for narrowing the opening area of the oil passage by the oil suction force generated in the oil passage toward the vane back pressure chamber. It is arranged, The claim 1 or 2 characterized by the above-mentioned.
The gas compressor according to 1.

That is, according to the invention of claim 1,
A small space is formed between the rear end portion of the rotor shaft and the rear side block, and the oil supplied to the small space is supplied to the vane back pressure chamber through an oil passage formed in the rear side block or in the rotor shaft. Therefore, the small space can be disconnected from the high-pressure chamber without using the O-ring, and the O-ring can be eliminated to supply oil to the vane back pressure chamber at an appropriate pressure.

The above-mentioned oil passage may be formed in the rear side block and directly connected to the saray groove or the like.
An oil passage is provided in the rotor shaft along the axial direction so as to communicate with the small space, and is temporarily deflected to the inside of the rear side block.
It may be connected to a saray groove or the like.

If the vane back pressure oil passage is formed in the rotor shaft along the axial direction, and the oil passage is radially deflected on the cylinder side and communicates with the vane back pressure chamber, As the number of rotations increases, the centrifugal force acting on the oil passage along the radial direction increases and the force that moves the oil in the oil passage to the outer peripheral side, that is, for the oil inside the rotor shaft, A strong suction force acts on the vane back pressure chamber side, and the oil may be excessively taken out from the lubricating oil space on the rear end side of the rotor shaft. Therefore, as described in claim 3, it is conceivable to dispose a throttle valve in the oil passage for narrowing the opening area of the oil passage by the oil suction force generated in the oil passage to the cylinder side. As a result, it is possible to prevent an excessive amount of suction force from acting on the lubricating oil space and fail to secure an appropriate amount of lubricating oil.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) An embodiment of the present invention will be described below with reference to the accompanying drawings. The same structures as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted or simplified as necessary. FIG. 1 shows the overall configuration of the gas compressor. The gas compressor includes a casing 1 having an intake port (not shown) at one end and a discharge port (not shown) at the other end. A suction pipe (not shown) is connected to the suction port to suck the refrigerant gas to be compressed from the outside, and a discharge pipe (not shown) for supplying the compressed refrigerant to a condenser or the like (not shown) at the discharge port. )
Connect. A suction chamber 2 is provided inside one side (suction port side) of the casing 1, and the suction port communicates with the suction chamber 2. Further, a cylindrical cylinder 3 having a substantially elliptical inner peripheral surface in a longitudinal section orthogonal to the axial direction and a cylindrical cylinder 3 fixed to the axially opposite end surfaces of the cylinder 3 in parallel with each other in the central portion of the casing 1. Front side block 4
(Suction port side) and rear side block 5 (Discharge port side)
And are arranged.

Inside the cylinder 3, as shown in FIG. 5, a rotatable rotor 6 supported by a rotor shaft 10 is provided.
A plurality of vane grooves 7 are radially formed in the rotor 6, and a vane 8 is slidably fitted and held in each of the vane grooves 7. Further, vane back pressure chambers 9 are formed so as to communicate with the inner peripheral side end portions of the vane grooves 7. The rotor shaft 10 is connected to an electromagnetic clutch 11, and the power of the vehicle engine is transmitted to the rotor shaft 10 via the electromagnetic clutch 11 to drive the rotor 7 to rotate, so that the vane 8 causes centrifugal force and back pressure chamber. The oil pressure of the lubricating oil by 9 advances and retreats in the vane groove 7 to rotate while closely contacting the inner peripheral wall of the cylinder 3. The rotor 6
By the rotation of the cylinder 3, the inside of the cylinder 3 is partitioned by the rotor 6 and the vane 8 to form the compression chamber 3a.

The cylinder 3 is provided with an opening (not shown) on the front side block 3 side and a discharge hole (not shown) on the rear side block 5 side so as to communicate with the compression chamber 3a. The gas sucked into the compression chamber 3a through the opening is compressed, and the compressed gas compressed in the compression chamber 3a is discharged into the high pressure chamber 15 through the discharge hole and the passage (not shown) formed in the rear side block 5. To be done. A cyclone block 141 is attached to the rear end side of the rear side block 5, and the cyclone block 141 separates oil from compressed gas. A high pressure chamber 15 is formed in the casing 1 behind the rear side block 6 and the cyclone block 141, and a discharge port is formed in the casing 1 so as to communicate with the high pressure chamber 15. An oil sump 17 is provided at the bottom of 15.

On the rear side block 5, an oil supply passage 20 for moving oil from the oil sump 17 is provided.
It is formed toward the shaft center on the rear end side, and is configured to be able to supply oil to the bearing portion on the rear end side of the rotor shaft 10. Further, the oil supply passage 20 is
It communicates with an oil supply passage 21 formed in the cylinder 3 along the axial direction, and the oil supply passage 21 communicates with an oil supply passage 22 formed in the front side block 4. The oil supply passage 22 extends toward the front end side of the rotor shaft 10,
It is configured to be able to supply oil to the bearing portion on the front end side of the rotor shaft 10. In addition, the rear end surface of the front side block 4 and the rear side block 5 that are in contact with the rotor shaft 10
Are formed with saray grooves 25, 26 on the front end face thereof, and the oil supplied to the bearing portion of the rotor shaft 10 flows into the saray grooves 25, 26 to supply the vane back pressure chamber 9 with the oil. To be done. Further, in the rear side block 5, a boss shape is provided on the rear end surface side of the rotor shaft 10 so that a small space 35 for lubricating oil is formed, and a recess is provided on the inner surface thereof. That is, the small space 35 is formed inside the rear side block 5. In the rear side block 5, a vane back pressure chamber oil passage 40, one end of which communicates with the small space 35 for lubricating oil, is formed so as to extend obliquely along the substantially axial direction and to the front. The other end of the vane back pressure chamber passage 40 is connected to the saray groove 26 and communicates with the vane back pressure chamber 9.

Next, the operation of the gas compressor will be described. When the rotor shaft 10 is rotated by the electromagnetic clutch 11 to rotate the rotor 6, the vane 8 is rotated by the rotation of the rotor shaft 10 by centrifugal force and supply of lubricating oil to the vane back pressure chamber 9 (described in detail below). The pushing force to the outer peripheral side acts. The vane 8 acted by the pushing force rotates while being in close contact with the inner peripheral wall of the cylinder 3 and the side walls of the front side block 4 and the rear side block 5. By this rotation, a suction force is generated in the cylinder 3, and the refrigerant gas is sucked into the casing 1 from the outside through the suction port. The refrigerant gas is sucked into the suction chamber 2 and then into the cylinder 3 through an opening (not shown). In the cylinder 3, the refrigerant gas is sequentially compressed by the compression chamber 3a formed by the further rotating rotor 6 and vane 8.

The compressed refrigerant gas is discharged from a discharge port (not shown) formed in the cylinder 3 to a compressed gas passage (not shown) formed in the rear side block 5. The discharged compressed gas sequentially moves in the compressed gas passage, the oil is separated by the cyclone block 141, and the separated compressed gas is discharged into the high pressure chamber 15. The compressed gas discharged into the high-pressure chamber 15 is sequentially discharged from the high-pressure chamber 15 through the discharge port to an external condenser or the like.
On the other hand, the separated oil drops into the oil sump 17. In the oil sump 17, due to the pressure difference between the high pressure chamber 15 and the suction chamber 2, the lubricating oil is sent to the oil supply passage 20 and is supplied to the bearing portion on the rear end side of the rotor shaft 10 to lubricate the bearing portion. To do. Further, a part of the oil in the oil supply passage 20 is branched into the oil passage 21 of the cylinder 3 and is supplied to the bearing portion on the tip end side of the rotor shaft 10 via the oil passage 22 of the front side block 4. Also lubricate the parts. The oil supplied to the bearings at the front and rear ends of the rotor shaft 10 is throttled and decompressed when passing through the bearings, and then a pair of oils are provided on the rotor-side end faces of the front side block 4 and the rear side block 5. It is supplied to the back pressure chamber 9 of the vane through the saray grooves 25 and 26, and assists the advance / retreat of the vane 8.

Further, the oil supplied to the bearing portion on the rear end side of the rotor shaft partially moves forward, and as described above, the oil groove 2
6 is fed to the rotor shaft 6, and part of it is moved backward to move the rotor shaft 1
0 is supplied to a small space 35 formed by the rear end surface of the cyclone block 14 and prevents the rear end surface of the rotor shaft from being burned. The oil supplied to the small space 35 passes through the oil passage 40 for the vane back pressure chamber, is supplied to the saray groove 26, and supplies the oil to the vane back pressure chamber 9. A part of the oil sent to the vane back pressure chamber 9 through the bearing portion and the oil passage 40 leaks from the vane back pressure chamber 9, and a gap between the rotor 6 and the front side block 4 or the rear side block 5, And it is sent out to the clearance gap between the vane 8 and the inner peripheral surface of the cylinder 3, and the clearance gap between the vane 8 and the front side block 4 or the rear side block 5 to prevent abrasion and seal with an oil film.

In the above embodiment, the small space 35 for oil storage on the rear end face of the rotor shaft is blocked from the high pressure chamber 15 by the boss shape of the rear side block 5, so it is necessary to block it by the O-ring as in the conventional case. Is not taken, so O
The occurrence of defects due to ring deterioration is eliminated.

(Embodiment 2) Next, another embodiment will be described with reference to FIG.
It will be described based on. In this embodiment, an oil passage for a vane back pressure chamber that connects the small space on the rear end face side of the rotor shaft and the salie groove is formed in the rotor shaft. The same components as those in the first embodiment and the conventional example are designated by the same reference numerals, and the description thereof will be omitted or simplified. In this embodiment, like the first embodiment, the rear side block 5 is provided with a boss shape at the rear position of the rear end surface of the rotor shaft 10, and the rear end surface of the rotor shaft 10 and the rear side block 5 are provided.
A small space 36 is formed between the inner space and the inner surface. On the rear end side of the rotor shaft 10, a vane back pressure oil passage 41 is formed in the axial center along the axial direction, and one end thereof is formed in the small space 36. On the other end side of the oil passage 41, the oil passage 41 is radially deflected immediately before the side end surface of the rotor 6, extends to the outer peripheral side, and is connected to the salley groove 26.

In the second embodiment, the gas is compressed as in the first embodiment, and the compressed gas is discharged from the discharge port. The oil in the oil sump 17 is also supplied to the bearing of the rotor shaft 10 to lubricate the bearing, as in the first embodiment. Then, part of the oil is supplied to the small space 36 on the rear end face side of the rotor shaft, so that seizure of the rear end face of the rotor shaft 10 is prevented. The oil supplied to the small space 36 moves inside the rotor shaft 10 through the oil passage 41, is radially deflected on the rotor 6 side, and is supplied to the saray groove 26 to supply the oil to the vane back pressure chamber. Also in this embodiment, the small space 36 on the rear end face of the rotor shaft is cut off from the high-pressure chamber 15 by the boss portion of the rear side block, so that the O-ring can be dispensed with, and a problem due to deterioration of the O-ring can be avoided. be able to. Further, in this embodiment, since the oil passage 41 is provided inside the rotor shaft 10, it is not necessary to secure a thick portion for forming the passage on the rear side block 5 side, and the boss portion is thin-walled. And miniaturization,
The volume of the rear side block can be reduced, and as a result, the volume of the high pressure chamber can be increased.

(Third Embodiment) This third embodiment is an improvement of the second embodiment in which the oil passage is formed inside the rotor shaft. That is, the vane back pressure chamber oil passage 42 is formed along the axial direction at the axial center inside the rotor shaft 10 as in the second embodiment, and extends radially toward the outer periphery on the rotor 6 side. Is biased. That is, the oil passage includes the axial portion 42a and the radial portion 42b. In addition, the axial portion 42a has a diameter that gradually decreases toward the rotor side at the contact portion with the radial portion 42b, and the coil spring 45 extends axially toward the rear at the contact portion at the radial portion 42b. A spherical valve body 46 is fixed to the rear end of the valve body 46. When the coil spring 45 is in an unloaded state, the valve body 46 is located in the large diameter portion of the axial portion 42b and secures a large opening area in the axial portion 42a. On the other hand, the coil spring 45
In the contracted state, the state moves to the smaller diameter side of the axial portion 42a and the opening of the axial portion 42a is narrowed. The rest of the configuration is similar to that of the second embodiment, and the description thereof is omitted.

In the third embodiment, when the compressor operates, the gas is compressed and the lubricating oil moves in the compressor, and the oil moves along the oil passage 42 in the same manner as in the above-described embodiment, so that the axial direction is increased. Oil is supplied from the portion 42a to the vane back pressure chamber (not shown) through the radial portion 42b. In the oil passage 42, a centrifugal force acts on the oil moving in the oil passage 42 in the radial portion 42b as the rotor shaft 10 rotates,
The oil moving in the axial portion 42a is sucked to the rotor side. When the number of rotations of the rotor shaft 10 increases, centrifugal force and suction force for oil moving in the axial portion 42a increase, and the suction force causes the valve body 46 to move toward the rotor side while compressing the coil spring 45. , The opening in the axial portion 42a is narrowed to suppress the movement of oil in the axial portion 42a. As a result, the oil is prevented from excessively moving from the space on the rear end face side of the rotor shaft to the vane back pressure chamber due to the increase in the number of revolutions of the rotor shaft 10, and an appropriate amount of oil is secured on the rear end face side of the rotor shaft. .

[0027]

As described above, according to the gas compressor of the present invention, the cylindrical cylinder, the front side block and the rear side block at the axial end portion of the cylinder, and the rotation in the cylinder are possible. , A vane groove provided in the rotor, a vane back pressure chamber provided in communication with the inner peripheral side end of the vane groove, and a vane housed in the vane groove so as to be able to move forward and backward. A rotor shaft for rotating the rotor, a high pressure chamber from which compressed gas is discharged from the cylinder, and an oil sump portion in which oil is stored and the pressure of the high pressure chamber acts, and in the rear side block There is a lubricating oil space on the rear end surface side of the rotor shaft, an oil supply passage for supplying oil from the oil sump portion is provided in the lubricating oil space, and a vane spine having one end communicating with the oil storage space. Oil for pressure chamber A passage is formed inside the rear side block or inside the rotor shaft, and the other end side of the oil passage communicates with the vane back pressure chamber, so that the rear side block alone forms a space on the rear end face side of the rotor shaft. Therefore, the O-ring for sealing with the high pressure chamber can be eliminated and the reliability can be improved. Further, by eliminating the O-ring, it is possible to reduce the cost and the number of assembling steps.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an overall view of a gas compressor showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing an overall view of a gas compressor according to another embodiment.

FIG. 3 is an enlarged cross-sectional view around a passage for a vane back pressure chamber showing still another embodiment.

FIG. 4 is a front sectional view showing an overall view of a conventional gas compressor.

FIG. 5 is likewise a side sectional view showing the cylinder and its interior.

[Explanation of symbols]

1 casing 2 Inhalation chamber 3 cylinders 3a compression chamber 4 Front side block 5 Rear side block 6 rotor 7 vane groove 8 vanes 9 Vane back pressure chamber 10 rotor shaft 141 cyclone block 15 High pressure chamber 17 Oil sump 20 oil supply path 21 Oil supply path 22 Oil supply path 25 Saray groove 26 Saray groove 30 small spaces 31 O-ring 35 small space 36 small space 40 vane back pressure chamber oil passage 41 Vane back pressure chamber oil passage 42 vane back pressure chamber oil passage 45 coil spring 46 valve body

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H029 AA05 AA15 AB03 BB01 BB06                       CC25 CC33                 3H040 AA09 BB11 CC06 CC18 DD01                       DD20 DD25 DD33 DD40

Claims (3)

[Claims] 1. A cylindrical cylinder, a front side block and a rear side block at an axial end portion of the cylinder, a rotor rotatably arranged in the cylinder, and a vane groove provided in the rotor. , A vane back pressure chamber provided in communication with the inner peripheral end of the vane groove, a vane housed in the vane groove so as to be able to move forward and backward, a rotor shaft for rotating the rotor, and compression from the cylinder. A high pressure chamber from which gas is discharged, oil is stored, and an oil sump portion on which the pressure of the high pressure chamber acts is provided, and a lubricating oil space is provided in the rear side block on the rear end face side of the rotor shaft, An oil passage for supplying oil from the oil reservoir is provided in the lubricating oil space, and an oil passage for a vane back pressure chamber, one end of which communicates with the oil storage space, is provided inside the rear side block or inside the rotor shaft. And the other end of the oil passage communicates with the vane back pressure chamber. 2. A salai groove communicating with the vane back pressure chamber is formed on a front end surface of the rear side block,
2. The gas compressor according to claim 1, wherein the oil passage is connected to the saray groove so that the oil passage communicates with the vane back pressure chamber. 3. The vane back pressure oil passage is formed in the rotor shaft along the axial direction, and the oil passage is radially deflected on the cylinder side and communicates with the vane back pressure chamber. The gas compression according to claim 1 or 2, wherein a throttle valve that restricts an opening area of the oil passage by an oil suction force generated in the oil passage toward the vane back pressure chamber is disposed in the passage. Machine.