JP2003113791A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate oil from gas compressed by a compressor without using an oil separating filter, which may increase the number of parts item or assembling man-hours. SOLUTION: This compressor comprises a compression chamber for compressing gas by rotation of a rotor 7, a discharge chamber 20, and a compressed gas passage 12a, which is installed between the compression chamber and the discharge chamber 20, communicating with the compression chamber at one end and opened to the discharge chamber 20 at the terminal end. An oil separating projection 16a for colliding with the compressed air and separating lubricating oil is provided to the compressed gas passage 12a. The compressed gas containing oil collides with the oil separating projection, and the oil is effectively separated. An oil separating filter can be eliminated, so that the number of parts item can be reduced, and the assembling man-hours 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 for air conditioning of automobiles and for compressing and discharging a gas such as a refrigerant gas.

[0002]

2. Description of the Related Art An example of the above-mentioned gas compressor will be described with reference to FIG. 10. Inside a casing 1, a cylinder 4 having a cylindrical inner circumference and front side blocks 5 at both axial ends of the cylinder 4 are provided. A rear side block 6, a rotor 7 rotatably arranged in the cylinder 4, and a vane (not shown) housed in a vane groove (not shown) provided in the rotor 7 so as to be able to move forward and backward. ing. The rotation of the rotor 7 changes the volume of the compression chamber partitioned by the rotor 7 and the vane to compress the gas. Further, the casing 1 has a discharge chamber 20 communicating with the cylinder compression chamber. A discharge hole is formed in the cylinder compression chamber on the rear side block 6 side, and a compressed gas passage 12 is formed in the thickness direction of the rear side block 6 so as to communicate with the discharge hole. Also, the rear side block 6
An oil passage block 13 is attached to the rear end side of the rear side block 6, and the compressed gas passage 12 is extended by the groove passage formed on the rear end surface of the rear side block 6 and the groove passage formed on the inner surface of the oil passage block 13. , Its end is oil passage block 1
3 to open to the discharge chamber 20 side. Further, the discharge chamber 20 is provided with an oil sump 21, which is delivered by a pressure difference between the discharge chamber 20 and the suction chamber 3 to prevent wear in the compressor and seal with an oil film.

The operation of the gas compressor will be described.
When the rotor 7 is rotated, the suction force to the cylinder compression chamber is generated by the operation of the vane, and the refrigerant gas is sucked. The refrigerant gas is sequentially compressed by the compression chamber, discharged from the discharge hole through the compressed gas passage 12 and the opening formed in the oil passage block 13. The compressed gas contains the lubricating oil as it moves, and in order to separate the lubricating oil, an oil separation filter 15 made of wire mesh or the like is arranged in the opening, and the compressed gas is discharged. The compressed gas and the oil are separated as the gas passes through the oil separation filter 15, the compressed gas separated from the oil is discharged to the discharge chamber 20, and the oil falls from the oil separation filter 15 to the oil sump 21.

[0004]

However, in the conventional gas compressor, the oil separation filter is provided at the opening of the oil separation block in order to separate the oil from the compressed gas. Filter installation work is required,
The number of parts and the number of assembling steps increase, which is a factor of cost increase. Further, when the filter is clogged or damaged, replacement work is required, which causes a problem of maintenance cost.

The present invention has been made in view of the above circumstances, and it is a gas that can effectively separate the compressed gas from the oil without increasing the manufacturing cost and requiring the maintenance cost. The purpose is to provide a compressor.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 of the gas compressor of the present invention is such that a gas is compressed by the rotation of a rotating body, and a compression chamber is used for compression. A discharge chamber for discharging gas, and a compressed gas passage provided between the compression chamber and the discharge chamber, one end of which communicates with the compression chamber and the end of which opens into the discharge chamber, It is characterized in that the compressed gas passage is provided with an oil separation projection part which collides with the compressed gas discharged from the compression chamber to separate the lubricating oil from the compressed gas.

According to a second aspect of the present invention, there is provided the gas compressor according to the first aspect, wherein the oil separation protrusion is arranged on a side of the compressed gas passage that is close to the terminal end. Is characterized by.

A third aspect of the present invention is the gas compressor according to the first or second aspect, wherein the gas compressing portion has a cylinder having a cylindrical inner circumference and both axial end portions of the cylinder. It is characterized in that it is provided with a side block, a rotor that is rotatably arranged in the cylinder, and a rotor that is a rotating body, and a vane that is retractably housed in a vane groove provided in the rotor.

A fourth aspect of the present invention is a gas compressor according to any one of the first to third aspects, wherein the oil separation protrusion is arranged such that the plate surfaces thereof intersect in the flow direction of the compressed gas passage. It is characterized by having a plate shape.

A fifth aspect of the present invention is a gas compressor according to any one of the first to third aspects, wherein the oil separation protrusion has a rod shape extending in a direction intersecting a flow direction of the compressed gas passage. It is characterized by

A sixth aspect of the present invention is the gas compressor according to any one of the first to fifth aspects, wherein the oil separation protrusions are arranged in a comb-teeth shape in a direction intersecting the flow direction of the compressed gas passage. It is characterized by

A seventh aspect of the present invention is a gas compressor according to any one of the first to sixth aspects, wherein the oil separation protrusion is provided on a surface of the compressed gas passage which is opposed to the oil separation protrusion along a flow direction of the passage. It is characterized in that a plurality of them are arranged alternately.

According to an eighth aspect of the present invention, there is provided the gas compressor according to any one of the first to sixth aspects, wherein the oil separation protrusion has a predetermined rotational angle difference along the flow direction of the compressed gas passage. It is characterized in that a plurality of them are arranged while doing.

That is, according to the present invention, the gas compressed in the compression section is discharged from the compression section to the compressed gas passage in a state where the oil is mixed, and moves toward the terminal end of the passage. At that time, the compressed gas sequentially collides with the oil separation projections provided in the compressed gas passage to efficiently separate the oil of the gas, and the compressed gas separated from the oil is the end of the compressed gas passage. Is discharged into the discharge chamber. The separated oil is collected in an oil sump or the like by dropping from the end of the passage.
When recovering the separated oil through the end of the compressed gas passage, the separated oil is prevented from being promptly removed from the compressed gas passage and taken into the compressed gas again. Desirably, the separation protrusion is located near the end of the compressed gas passage.

The gas compressor of the present invention has a compression section for compressing gas by the rotation of the above-mentioned rotating body, but the specific structure, shape, etc. of the present invention are not particularly limited. Not something. Typically, as described in claim 3, a vane compressor is used.

Further, according to the present invention, there is provided a compressed gas passage which is provided between the compression chamber and the discharge chamber and whose end portion is opened into the discharge chamber. The passage communicates with the compression chamber and the discharge chamber, respectively, and the shape, number, etc. of the passage are not particularly limited in the present invention. In the vane type compressor according to claim 3, it is usually formed in the rear side block, and further formed continuously with the oil separation block attached to the rear end surface of the rear side block,
An opening that opens to the discharge chamber is formed in the oil separation block.

Further, in the present invention, the compressed gas passage is provided with
An oil separation protrusion is provided which collides with the compressed gas and separates the lubricating oil from the compressed gas. In the present invention, the number and shape of the oil separation protrusions can be appropriately determined. It is necessary that the oil separation projection portion can effectively separate the oil from the compressed gas, and also that it does not hinder the movement of the compressed gas. From these viewpoints, the shape, the installation position, and the number of the oil separation protrusions can be determined. Further, the oil separating projection may be formed separately from the compressed gas passage and installed in the passage, but it may be formed integrally with the passage.

With respect to the shape of the oil separation projection, as described in claim 4, a plate shape along the longitudinal cross section of the compressed gas passage, a rod shape described in claim 5, and a comb described in claim 6. Tooth shape and the like can be mentioned. Further, in the arrangement, a plurality of the passages can be arranged on the same surface of the passage at predetermined intervals along the moving direction of the compressed gas, and they may be provided on different surfaces, for example, opposite surfaces, Claim 7
As described in claim 8, the compressed gas passages may be alternately provided on the opposing surfaces of the compressed gas passage along the moving direction of the compressed gas. Further, as described in claim 8, a predetermined angle may be provided along the moving direction of the compressed gas. It is also possible to form (that is, arrange in a spiral shape) on the inner surface of the passage with a difference.

In order to avoid a pressure loss due to the movement of the compressed gas by the oil separation protrusion, the compressed gas passage is provided with a small vertical cross-section area located on the compression section side and a large vertical cross-section area located on the discharge chamber side. The oil protrusion can be provided in the large vertical cross-section area. Further, in order to further reduce the occurrence of pressure loss, the oil separation protrusions are alternately arranged on the opposing surfaces of the compressed gas passage as described above, and the vertical cross-sectional area between the oil separation protrusion and the inner surface of the passage and the oil separation protrusions are arranged. It is desirable that the cross-sectional area between the parts be equal to or larger than the cross-sectional area of the small vertical cross-sectional area part. As a result, the effective sectional area through which the compressed gas passes is not reduced by the installation of the oil protrusions.

[0020]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. The same reference numerals are given to the same structures as those in the conventional example. FIG. 1 shows the overall configuration of the gas compressor. The gas compressor includes a casing 1 having an inlet (not shown) at one end and an outlet 22 at the other end. A suction pipe (not shown) is connected to the suction port to suck a 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) is provided to the discharge port 22. Not) connect. A suction chamber 3 is provided inside one side (suction port side) of the casing 1, and the suction port communicates with the suction chamber 3. Further, in the center of the casing 1, a cylindrical cylinder 4 having a substantially elliptical inner peripheral surface in a vertical cross section orthogonal to the axial direction, and axially opposite end surfaces of the cylinder 4 are fixed in parallel with each other. A front side block 5 (at the suction port side) and a rear side block 6 (at the discharge port 22 side) are arranged.

As shown in FIG. 2, a rotatable rotor 7 supported by a rotor shaft 8 is disposed inside the cylinder 4. The rotor 7 has a plurality of vane grooves 3
A plurality of vanes 31 (five in the figure) that are slidably fitted to 0 are radially held. The rotor shaft 8 is connected to the electromagnetic clutch 9, and the rotational drive of the vehicle engine is transmitted to the rotor 7 via the electromagnetic clutch 9 to be rotationally driven, so that the vane 31 moves from its centrifugal force and the back pressure chamber 32. The vane groove 3 depends on the oil pressure of the lubricating oil supplied.
It is configured so as to advance and retreat in 0 and rotate while closely contacting with the inner peripheral wall of the cylinder 4. By the rotation of the rotor 7, the compression chamber 10 is configured by being partitioned by the rotor 7 and the vanes 31. A gas compression unit is configured mainly with the cylinder 4, the rotor 7, and the vane 31.

Further, the cylinder 4 is formed with a pair of discharge holes 11, 11 on the rear side block 6 side so as to communicate with the compression chamber 1, and the discharge holes 11, 11 are formed.
Compressed gas passages 12a, 12b communicating with the discharge holes 11, 11 are formed in the thickness direction of the rear side block 6 so as to communicate with each other. An oil passage block 13 is attached to the rear end side of the rear side block 6, and the compressed gas passage 12a is formed by the groove passage formed on the rear end surface of the rear side block and the groove passage formed on the inner surface of the oil passage block. , 12b are extended, and at their ends, they join each other and open to the discharge chamber 20 side through the oil passage block 13.

A cylindrical bottomed outflow portion 17 protruding toward the discharge chamber 20 is provided at the opening of the oil passage block 13, and an opening 17a is provided at the upper and lower portions of the outflow portion 17.
17b is formed. Further, the discharge chamber 20 is provided with an oil sump 21, and the oil supplied from the oil sump 21 prevents wear in the compressor and seals with an oil film. A discharge port 22 provided in the casing 1 communicates with the discharge chamber 20.

Further, in the compressed gas passages 12a and 12b, as shown in FIGS. 3 and 4, plate-shaped oil separation projections 16a and 16b are provided in the vicinity of the confluence portion, and plate surfaces are the passages 12a and 12a.
The oil separation protrusions 16 are provided at positions close to the openings so as to be orthogonal to the flow direction of the oil separation 12b.
A gap is secured between the tip ends of a and 16b and the inner surfaces of the compressed gas passages 12a and 12b. In this embodiment, the oil separation protrusions 16a and 16b are arranged so that the plate surfaces thereof are orthogonal to the flow direction of the passage, but any plate may be arranged so that the plate surfaces intersect the flow direction. The angle difference is not limited.

Next, the operation of the compressor will be described. The engine power of the vehicle is transmitted to the rotor shaft 8 by the electromagnetic clutch 9, and the rotor shaft 8 is rotationally driven to rotate the rotor 7
Rotates. Along with the rotation, centrifugal force and supply of lubricating oil to the back pressure chamber 32 exert a pushing force on the vane 31 toward the outer peripheral side. The vane 31 acted by the pushing force acts on the cylinder 4
The inner side wall and the side walls of the front side block 5 and the rear side block 6 rotate while closely contacting each other. By this rotation, a suction force is generated in the cylinder 4, and the refrigerant gas is sucked from the outside through the suction port. The refrigerant gas is sucked into the suction chamber 3 and then into the cylinder 4. In the cylinder 4, the refrigerant gas is sequentially compressed by the compression chamber 10 formed by the further rotating rotor 7 and vane 31.

The compressed refrigerant gas is discharged from the discharge port 11 formed in the cylinder 4 into the compressed gas passages 12a and 12b. The compressed gas discharged is sequentially compressed gas passage 1
2a, 12b, and collide with oil separation projections 16a, 16b provided in the passages 12a, 12b. By the collision with the oil separation projections 16a and 16b, the oil is separated from the compressed gas, and the separated compressed gas of the oil and the separated oil move from the compressed gas passages 12a and 12b to the opening and are compressed. The gas is discharged from the discharge chamber 2 through the opening 17a of the outflow portion 17.
The oil moves above 0 and drops into the oil sump 21 from the opening 17b of the outflow part 17. In the oil sump 21, due to the pressure difference between the discharge chamber 20 and the suction chamber 3, the lubricating oil comes into close contact with the bearing portion of the rotor shaft 8, the back pressure chamber 32, the vane 31 and the inner peripheral surface and side wall surface of the cylinder 4. It is sent out to the section, wear is prevented, and a seal is made with an oil film. The compressed gas discharged into the discharge chamber 20 is sequentially discharged from the discharge chamber 20 through the discharge port 22 to an external condenser or the like.

In the above compressor, the oil separation protrusion is provided in the compressed gas passage, and the oil is separated from the compressed gas by this protrusion. Therefore, when assembling the compressor, the number of parts and the manufacturing cost are increased. I can suppress the increase as much as possible,
Also, maintenance work is not required for the oil separation protrusion.

In the above-described embodiment, the oil separation protrusions are provided on one surface of the compressed gas passage, but the oil protrusions may be provided on different surfaces of the compressed gas passage. FIG. 5 shows that the plate-shaped oil separation protrusions 5 are provided on the facing surfaces of the compressed gas passages 40.
Nos. 0 and 50 are provided, and a gap is secured between the tip portions of each other. Further, the oil separation protrusions 50, 50 are
Both sides thereof have a gap with the inner surface of the compressed gas passage 40. The compressed gas passing through the compressed gas passage 40 sequentially collides with the oil separation projections 50, 50 to separate the oil, and the oil passes through the gap between the projections 50, 50 and the gaps on both sides of the projections 50. The separated compressed gas and separated oil are smoothly moved.

In FIG. 6, similarly to FIG. 5, oil separating projections 51a and 51b are provided on the facing surface of the compressed gas passage 41. 51a ... 51b, 51b ... 51b
Are arranged in a comb-tooth shape in a direction traversing the compressed gas passage 41, a gap is secured between the oil separation protrusion 51a and the oil separation protrusion 51b, and further adjacent protrusions 51a,
Small gaps are secured between the 51a and between the protrusions 51b and 51b, and the compressed gas and the separated oil are moved through the gaps and the small gaps.

FIG. 7 shows another modification of the oil separating projection. In the type A, plate-shaped oil separation protrusions 52 are arranged in different steps along the moving direction of the compressed gas on the opposed surface of the compressed gas passage 42. When the compressed gas passes through the compressed gas passage 42, the compressed gas reliably collides with the oil separation projections 52, 52, and the oil is effectively separated from the compressed gas.

In the type B, the plate-shaped projections 53 ... 53 are provided alternately on the opposing surface of the compressed gas ventilation passage 43 along the moving direction of the compressed gas. The compressed gas collides more reliably with the oil separation projections 53 ... 53 to separate the oil.

In the type C, a plurality of plate-shaped projections 54 are provided along the moving direction of the compressed gas so that both sides have a gap with the inner surface of the compressed gas passage 44. The compressed gas that has collided with the oil separation protrusion 54 and separated from the oil moves through both sides of the oil separation protrusion 54.

In the type D, a plurality of cylindrical rod-shaped projections 55 extending in a direction intersecting the moving direction of the compressed gas are arranged in the compressed gas passage 45 along the moving direction of the compressed gas. In this type, the resistance against the movement of the compressed gas is relatively small, and it is possible to smoothly move in the passage,
Moreover, the compressed gas surely collides with the plurality of cylindrical rod-shaped projections arranged along the moving direction of the compressed gas to separate the oil.

FIG. 8 shows another modification of the oil separating projection. In the compressed gas passage 46, plate-shaped oil separation protrusions 56 to 59 are arranged at predetermined intervals along the flow direction of the compressed gas passage 46. Each has a size and a shape that closes approximately half of the compressed gas passage 46, and each has a rotation angle difference of 90 degrees (constant rotation direction) along the flow direction of the compressed gas passage 46. . Note that this rotation angle difference can be appropriately determined, and it is not essential that the rotation angle difference be constant.

According to the oil separation projections 56 to 59, when the compressed gas passes through the compressed gas passage 46, the openings formed by the oil separation projections are sequentially positioned at 90 degrees with a rotation angle difference, so that the compressed gas is compressed. Will move in a spiral. When the projection makes the flow of compressed gas spiral like this, centrifugal force acts on the compressed gas, and not only collision with the oil separation projection but also centrifugal force causes oil with a large specific gravity to adhere to the inner peripheral wall of the passage. However, the refrigerant gas component having a low specific gravity passes through the passage to obtain an action of promoting oil separation. In the above description, the oil separation protrusions are arranged so as to have a predetermined rotation angle difference along the flow direction of the compressed gas passage to generate the spiral compressed gas flow. The method for arranging the oil separation protrusion of is not limited to the above,
For example, it is possible to generate a spiral flow by arranging the oil separation protrusions having a spiral shape, and it is sufficient that the oil separation protrusions are arranged to obtain the spiral flow.

FIG. 9 shows another modified example of the oil separating projection. The compressed gas passage 60 is composed of a small vertical cross section 60a on the compression chamber side and a large vertical cross section 60b on the discharge chamber side. On the large vertical cross section 60b side, the surfaces facing each other along the moving direction of the compressed gas are alternately plate-shaped. Oil separation protrusion 70
... 70 is provided. The distance between the tip end edge of the oil separation protrusion 70 and the inner surface of the compressed gas passage that faces the oil separation protrusion 70 and the distance A between the oil separation protrusions 70 and 70 are the same as the height A of the small vertical cross section 60a. The cross-sectional areas of the spaces that they have are the same. When the compressed gas containing oil passes through the compressed gas passage 60, the compressed gas passes through the oil separation projection 7
It moves in each space having the distance A while colliding with 0 and separating oil. In this movement, since the effective cross-sectional areas are almost the same, the movement resistance is small and the compressed gas can move smoothly.

[0037]

As described above, according to the gas compressor of the present invention, the compression chamber for compressing the gas by the rotation of the rotating body, the discharge chamber for discharging the gas compressed in the compression chamber,
A compression gas passage is provided between the compression chamber and the discharge chamber, one end of which communicates with the compression chamber, and the end of the compression gas passage opens into the discharge chamber. Since the oil separation protrusion that separates the lubricating oil from the compressed gas by collision with the discharged compressed gas is provided, the oil separation function can be obtained without significantly increasing the component cost or the manufacturing cost. Moreover, the oil can be effectively separated from the compressed gas containing the oil. Further, in the present invention, since the oil separation filter can be omitted, the number of parts and the number of assembling steps can be reduced.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing an entire gas compressor according to an embodiment of the present invention.

FIG. 2 is a side view showing the inside of the cylinder.

FIG. 3 is a side view showing a rear side block and an oil separation block of the same.

FIG. 4 is an enlarged sectional view showing a compressed gas passage of the same.

FIG. 5 is an enlarged cross-sectional view showing a modified example of the oil separation protrusion.

FIG. 6 is an enlarged cross-sectional view showing another modified example of the oil separation protrusion.

FIG. 7 is an enlarged cross-sectional view showing still another modified example of the oil separation protrusion.

FIG. 8 is an enlarged cross-sectional view showing still another modified example of the oil separating protrusion.

FIG. 9 is an enlarged cross-sectional view showing still another modified example of the oil separation protrusion.

FIG. 10 is a front sectional view showing the entire conventional gas compressor.

[Explanation of symbols]

1 casing 3 inhalation chamber 4 cylinders 5 Front side block 6 rear side block 7 rotor 10 compression chamber 11 Discharge hole 12a compressed gas passage 12b Compressed gas passage 13 Oil separation block 16a Oil separation protrusion 16b Oil separation protrusion 20 discharge chamber 21 Oil sump 22 Discharge port 30 vane grooves 31 vanes 32 Back pressure chamber 40 compressed gas passage 41 Compressed gas passage 42 Compressed gas passage 43 Compressed gas passage 44 Compressed gas passage 45 Compressed gas passage 46 Compressed gas passage 50 Oil separation protrusion 51a Oil separation protrusion 51b Oil separation protrusion 52 Oil separation protrusion 53 Oil separation protrusion 54 Oil separation protrusion 55 Oil separation protrusion 56 Oil separation protrusion 57 Oil separation protrusion 58 Oil separation protrusion 59 Oil separation protrusion 60 compressed gas passage 70 Oil separation protrusion

Claims (8)

[Claims] 1. A compression chamber for compressing gas by rotation of a rotating body, a discharge chamber for discharging the gas compressed in the compression chamber, and one end portion provided between the compression chamber and the discharge chamber. Is provided with a compressed gas passage communicating with the compression chamber and having a terminal end opening into the discharge chamber. The compressed gas discharged from the compression chamber collides with the compressed gas passage to separate lubricating oil from the compressed gas. A gas compressor having an oil separation protrusion. 2. The gas compressor according to claim 1, wherein the oil separation protrusion is arranged on a side of the compressed gas passage that is close to the terminal end. 3. The gas compressing section includes a cylinder having a cylindrical inner circumference, side blocks at both ends of the cylinder in the axial direction, and a rotor, which is a rotating body, rotatably arranged in the cylinder, The gas compressor according to claim 1 or 2, further comprising: a vane housed in a vane groove provided in the rotor so as to be able to move forward and backward. 4. The oil separation protrusion has a plate shape arranged such that the plate surfaces thereof intersect in the flow direction of the compressed gas passage. Gas compressor. 5. The gas compressor according to claim 1, wherein the oil separation protrusion has a rod shape extending in a direction intersecting a flow direction of the compressed gas passage. 6. The gas compression method according to claim 1, wherein the oil separation protrusions are arranged in a comb shape in a direction intersecting a flow direction of the compressed gas passage. Machine. 7. The plurality of oil separation protrusions are arranged alternately on the opposite surfaces of the compressed gas passage along the flow direction of the passage, according to any one of claims 1 to 6. The gas compressor according to 1. 8. The plurality of oil separation protrusions are arranged along the flow direction of the compressed gas passage with a predetermined rotation angle difference in sequence. The gas compressor according to 1.