JP2003155986A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor provided with a check valve having high reliability for vibration. SOLUTION: A valve mounting hole 33 is provided on a front head opposing face of a front side block 5. A valve seat bush 31 of the check valve 30 is pressed in the valve mounting hole 33. A projection 36 opposing to a tip part of the valve seat bush 31 and abutting on it is integrally provided on an inner side face of a front head 4 to lock the valve seat bush 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane rotary type gas compressor used in a car air conditioner system or the like.

[0002]

2. Description of the Related Art Conventionally, this type of vane rotary type gas compressor has a vane back pressure space 28 communicating with the bottom of the vane 17, as shown in FIGS. Due to the back pressure of the vane supplied from the space 28 to the bottom of the vane 17 and the centrifugal force generated by the rotation of the rotor 12, the vane 17 is configured to project from the outer peripheral surface of the rotor 12 toward the inner peripheral surface of the cylinder 7. However, the popping-out property of the vane 17 may be deteriorated when the gas compressor is started.

For example, on the evaporator side of an air conditioner system in which this gas compressor is incorporated, there is oil that circulates in the system, and the refrigerant dissolved in this oil is warmed by outside air or the like when the gas compressor is stopped to form a foam gas and form a gas. When the gas flows into the suction chamber 8 side of the compressor, the suction chamber 8 is compared with the pressure of the vane back pressure space 28 when the gas compressor is started.
Is higher, and the high pressure of the suction chamber 8 acts on the tip of the vane 17 and pushes back the vane 17, so that the popping-out property of the vane 17 is deteriorated at the time of startup.

Therefore, in this type of vane rotary type gas compressor, a check valve 30 having the structure shown in FIGS. 6 and 7 is provided in order to improve the popping-out property of the vane 17 at the time of starting.

FIG. 6 is an explanatory view of a conventional gas compressor seen from the direction of arrow B in FIG. 1, and FIG. 7 is a sectional view taken along the line D--D of FIG. Explaining the check valve 30 provided in the machine, the check valve 30 has a valve mounting hole 33 provided on the surface of the front side block 5 forming the wall surface of the suction chamber 8 of the gas compressor shown in FIG. The valve seat bush 31 has a structure in which the valve seat bush 31 is press-fitted into the valve mounting hole 33. In the valve seat bush 33, a valve passage 34 that communicates between the suction chamber 8 and the vane back pressure space 28 is provided. The formed valve seat portion 35 is provided, and the valve body 32 is movably installed in the valve passage 34.

In the case of a gas compressor provided with the check valve 30 having the above structure, before starting it,
When the pressure in the suction chamber 8 is higher than the pressure in the vane back pressure space 28, the check valve 30 operates. That is, the differential pressure between the vane back pressure space 28 and the suction chamber 8 causes the valve element 32 to separate from the valve seat portion 35 and open the valve passage 34. As a result, the refrigerant in the suction chamber 8 is introduced into the vane back pressure space 28 via the valve passage 34, and the vane back pressure space 2
Since the pressure in the suction chamber 8 and the pressure in the suction chamber 8 become equal to each other, the force for pushing back the vane 17 is not generated as described above, and the popping-out property of the vane 17 at the time of startup is improved.

However, in the conventional gas compressor as described above, the valve seat bush 31 is press-fitted into the valve mounting hole 33 on the surface of the front side block 5, and the valve seat bush 31 is attached by the frictional force due to the press-fitting. Since the structure is held, there is a problem in that the reliability of the check valve 30 with respect to vibration and the like is low, such that the valve seat bush 31 may fall out when unexpected vibration or differential pressure occurs.

[0008]

The present invention has been made to solve the above problems, and an object thereof is to provide a gas compressor provided with a check valve having high reliability against vibrations and the like. Especially.

[0009]

In order to achieve the above object, the present invention is directed to a front head attached to an open end of a compressor case, a front side block facing an inner surface of the front head, and a rear side position thereof. Cylinder inserted between the rear side block and the rotor, a rotor rotatably laterally installed in the cylinder, and a vane provided so as to be retractable from the outer peripheral surface of the rotor toward the inner peripheral surface of the cylinder. And communicate with the bottom of the vane,
Also, a vane back pressure space for supplying vane back pressure to the bottom of the vane, the cylinder, the side block, the rotor,
A compression chamber that is composed of a small chamber inside the cylinder that is formed by a vane and that changes in volume by the rotation of the rotor, and that sucks and compresses the refrigerant in the suction chamber by this volume change, and the front head of the front side block. A valve passage, which is press-fitted into a valve mounting hole formed in the opposing surface and communicates between the suction chamber and the vane back pressure space, and a valve seat portion formed in the middle of the valve passage. The valve seat bush is disposed in the valve passage, and when the pressure in the suction chamber becomes higher than the pressure in the vane back pressure space, the valve seat bush is separated from the valve seat portion by this pressure difference. Side that is integrally provided on the inner surface of the front head and that opens the valve passage, and that faces the tip of the valve seat bush. It is to characterized in that it comprises a projection and disposed.

According to the present invention, a front head attached to an open end of a compressor case, a cylinder inserted between a front side block facing an inner surface of the front head and a rear side block located behind the front side block are provided. A rotor horizontally rotatably mounted in the cylinder, a vane provided so as to be retractable from an outer peripheral surface of the rotor toward an inner peripheral surface of the cylinder, and a bottom portion of the vane that communicates with each other, and A vane back pressure space for supplying vane back pressure to the bottom of the vane, and a small chamber inside the cylinder formed by the cylinder, the side block, the rotor, and the vane, and the rotation of the rotor repeatedly changes the volume. The compression chamber that sucks and compresses the refrigerant in the suction chamber due to this volume change is integrally provided on the inner surface of the front head. A valve passage that is press-fitted into a valve mounting hole formed in the front head block-facing surface of the front side block and that communicates between the suction chamber and the vane back pressure space, and is formed in the middle of this valve passage. When the pressure in the suction chamber is higher than the pressure in the back pressure space of the vane, the difference between the valve seat bush having the valve seat portion and the valve seat bush disposed in the valve passage. And a valve body that opens the valve passage away from the valve seat portion by pressure.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a gas compressor according to the present invention will be described in detail below with reference to FIGS. 1 to 5.

The gas compressor of this embodiment has a structure in which the compression mechanism portion 2 is housed inside the outer casing 1 as shown in FIG.

The outer casing 1 is composed of a compressor case 3 which is open at one end and a front head 4 which is attached to the open end of the compressor case 3 with screws.

The compression mechanism section 2 has a structure in which a cylinder 7 having an inner peripheral ellipse is inserted between a front side block 5 and a rear side block 6 located behind the front side block 5, and the front side block 5 is the front of the cylinder 7. The rear side block 6 is attached to the side end surface and is arranged to face the inner side surface of the front head 4, and the rear side block 6 is attached to the rear side end surface of the cylinder 7 and is arranged to face the inner side surface of the compressor case 3. There is.

Further, the front side block 5 forms a suction chamber 8 with the front head 4, and the rear side block 6 forms a discharge chamber 9 with the inner side surface of the compressor case 3. . The suction chamber 8 is connected to the evaporator side of the air conditioner system (not shown) via the suction port 10 of the compressor case 3, and the discharge chamber 9 is connected to the condenser side of the air conditioner system via the discharge port 11 of the compressor case. Connected.

A rotor 12 is arranged in the cylinder 7, and the rotor 12 has a rotor shaft 13 integrally provided on its axis and bearings 14 and 15 of front and rear side blocks 5 and 6 supporting the rotor shaft 13. Cylinder cylinder 7
It is rotatably mounted inside.

As shown in FIG. 2, five vane grooves 16 are formed in the rotor 12 in the radial direction, and one vane 17 is slidably mounted in each of these vane grooves 16. Each vane 17 is provided so as to be retractable from the outer peripheral surface of the rotor 12 toward the inner peripheral surface of the cylinder 7.

The inside of the cylinder 7 is partitioned into a plurality of small chambers by the inner wall of the cylinder 7, the inner surfaces of the front and rear side blocks 5 and 6, the outer peripheral surface of the rotor 12 and the both side surfaces on the tip end side of the vane 17. The small chamber is a compression chamber 18, and the rotor 12 rotates in the direction of the arrow a in the drawing, so that the volume of the compression chamber 18 changes repeatedly, and the volume change causes the refrigerant in the suction chamber 8 to be sucked and compressed.

That is, when the volume of the compression chamber 18 changes, the low-pressure refrigerant in the suction chamber 8 passes through the suction passage 19 such as the cylinder 7 and the suction ports 20 of the front and rear side blocks 5, 6 when the volume of the compression chamber 18 increases. Is sucked into the compression chamber 18. When the volume of the compression chamber 18 begins to decrease, the refrigerant in the compression chamber 18 begins to be compressed due to the volume reduction effect. After that, when the volume of the compression chamber 18 approaches the minimum, the reed valve 22 of the cylinder discharge hole 21 located near the elliptical minor axis portion of the cylinder 7 opens due to the pressure of the compressed high pressure refrigerant. As a result, the high-pressure refrigerant in the compression chamber 18 is discharged from the cylinder discharge hole 21 to the discharge chamber 9 via the discharge chamber 23 outside the cylinder and the high-pressure gas passage 24 of the rear side block 6.

As described above, the refrigerant sucked from the suction chamber 8 into the compression chamber 18 usually contains several% of the oil circulating in the air conditioner system, and the oil-containing refrigerant is compressed as described above. Since it is compressed in the chamber 18, the high-pressure refrigerant discharged to the discharge chamber 23 side also contains oil in a mist state, and the oil component in such high-pressure refrigerant is on the discharge chamber side of the high-pressure gas passage 24. The oil is separated and captured by the oil separator 25 provided at the opening end, and is dropped and stored in the oil reservoir 26 at the bottom of the discharge chamber 9.

The pressure of the high-pressure refrigerant discharged into the discharge chamber 9 acts on the oil sump 26, and the oil in the oil sump 26 on which such discharge pressure acts acts on the front and rear side blocks 5, 6. After passing through the clearance between the oil hole 27 of the cylinder 7 and the bearings 14 and 15, the pressure is finally fed to the vane back pressure space 28 communicating with the bottom of the vane 17. In the case of this embodiment, the vane back pressure space 28 is
The front and rear side blocks 5 and 6 are formed by a saray groove 29 formed on the cylinder facing surface and a bottom space of the vane groove 16 communicating with the saray groove 29. And
The pressure of the oil pumped to the vane back pressure space 28 acts on the bottom of the vane 17 as a force (back pressure) that pushes the vane 17 toward the inner peripheral surface of the cylinder 7.

By the way, even in the gas compressor of the present embodiment, when the gas compressor is stopped, the refrigerant flows from the evaporator side of the air conditioner system to the suction chamber 8 side as in the conventional case, so that the above-mentioned vane back pressure is reduced. If a pressure difference occurs between the space 28 and the suction chamber 8 and the pressure in the suction chamber 8 becomes higher, the popping-out property of the vane 17 at the time of start-up deteriorates. Also in the gas compressor, the check valve 30 having the structure shown in FIGS. 3 and 4 is provided.

Here, FIG. 3 is an explanatory view of the gas compressor of this embodiment as seen from the direction of the arrow B in FIG. 1, and FIG. 4 is a sectional view taken along the line CC of FIG. The check valve 30 provided in the gas compressor according to the present embodiment will be described. The check valve 30 includes a valve seat bush 31 and a valve body 32.

In this embodiment, the surface of the front side block 5 (hereinafter referred to as "front head facing surface") facing the inner surface of the front head 4 forms the wall of the suction chamber 8. A valve mounting hole 33 is provided in the surface of the front side block 5 facing the front head, and the valve seat bush 31 of the check valve 30 is press-fitted into the valve mounting hole 33.

The valve seat bush 31 has a suction chamber 8
And a valve passage 34 communicating between the vane back pressure space 28
And a valve seat portion 35 formed in the middle of the valve passage 34, and the check valve 3 is provided in the valve passage 34.
The zero valve body 32 is movably installed. When the pressure in the suction chamber 8 is higher than the pressure in the vane back pressure space 28, the valve body 32 separates from the valve seat portion 35 by the pressure difference and opens the valve passage 34. On the contrary, when the pressure in the vane back pressure space 28 is higher, the valve 32
Is brought into close contact with the valve seat portion 35 due to the pressure difference and the valve passage 3
4 is closed. The differential pressure means the force generated by the pressure difference between the pressure in the vane back pressure space 28 and the pressure in the suction chamber 8.

To prevent the valve seat bush 31 from coming off, a projection 36 is provided on the inner surface of the front head 4, and the projection 36 is formed integrally with the inner surface of the front head 4 when the front head is molded. In addition, the valve seat bush 31 is located on the side facing the tip end portion of the valve seat bush 31 and is in contact with the tip end portion of the valve seat bush 31. That is, in the case of the present embodiment, even if the valve seat bush 31 tries to come out of the valve mounting hole 33 due to vibration or the like, the protrusion 36 is provided in the coming-out direction.
Therefore, the valve seat bush 31 will not fall out unless the protrusion 36 disappears.

Further, the projection 36 on the inner surface of the front head 4 in this embodiment functions as a retaining means for the valve seat bush 31 as described above, and also when the valve seat bush 31 is press-fitted into the valve mounting hole 33. It can also function as a press-fitting means.

That is, when assembling the gas compressor of this embodiment, after the assembly structure including the cylinder 7, the front and rear side blocks 5, 6, the rotor 12, the vane 17 and the like is housed in the compressor case 3, the compressor is The front head 4 is screwed and fixed to the opening end of the case 3, but at this time, the valve seat bush 31
If a part of the front seat 4 is inserted and set in the valve mounting hole 33, the screwing fixing force of the front head 4 is applied to the valve seat bush 31 through the projection 36 on the inner surface of the front head 4.
Since it is transmitted to the tip portion, it is possible to fix the front head 4 by screwing, and at the same time, the valve seat bush 31 can be pressed into the valve mounting hole 33 by the screwing fixing force.

By the way, in this embodiment, since the suction chamber side opening end of the valve passage 34 is opened at the tip of the valve seat bush 31, the suction chamber side opening end of this valve passage 34 is inside the front head 4. In order to avoid being blocked by the tip of the side projection 36, the projection 36 is opposed to the tip of the valve seat bush 31 at a position displaced from the suction chamber side opening end of the valve passage 34. It is provided so that it touches. Therefore, the flow of the refrigerant from the suction chamber 8 to the valve passage 34 side is not blocked by the protrusion 36.

At the position of the opening of the valve passage 34 on the suction chamber side, the tip of the valve seat bush 31 and the projection 3 are formed.
It is also possible to adopt a structure in which 6 and 6 are in contact with each other,
In the case of this structure, the suction chamber side opening end of the valve passage 34 is blocked by the tip end portion of the projection 36, so that the suction chamber side opening end of the blocked valve passage 34 and the suction chamber 8 side are closed. To communicate with each other, a groove (not shown) is formed in at least one of the tip of the protrusion 36 and the tip of the valve seat bush 31, and the valve passage 3 is formed through this groove.
The suction chamber side opening end of No. 4 and the suction chamber 8 side are made to connect.

In the above embodiment, the protrusion 3 for preventing the valve seat bush from coming off is provided on the inner surface of the front head 4.
The example in which one 6 is formed has been described.
The number of six can be appropriately increased if necessary in consideration of the phenomenon of the valve seat bush 31 coming off.

Further, as means for preventing the valve seat bush 31 from slipping off, a structure for providing a projection 36 for preventing the valve seat bush from slipping off on the inner surface of the front head 4 as in the above-described embodiment is shown in FIG. As described above, the valve seat bush 31 itself, which is press-fitted into the valve mounting hole 33, may be integrally formed on the inner side surface of the front head 4. In this structure, the compressor case 3 is firmly screwed. Unless the stopped front head 4 comes off and falls off, the valve seat bush 31 does not fall off.

[0033]

As described above, in the gas compressor according to the present invention, as a mounting structure of the check valve including the valve seat bush and the valve body, the check valve is integrally provided on the inner side surface of the front head and the valve is attached. Since a structure is provided that has a protrusion that is arranged on the side facing the tip of the seat bush, or that valve seat bush itself is integrally provided on the inner surface of the front head, it is possible It is possible to effectively prevent the valve seat bush from coming off, and to provide a gas compressor equipped with a highly reliable check valve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the basic configuration of a vane rotary type gas compressor.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view of the gas compressor according to the embodiment of the present invention when viewed in the direction of arrow B in FIG. 1.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is an explanatory diagram of another embodiment of the present invention.

FIG. 6 is an explanatory view of a conventional gas compressor seen from the direction of arrow B in FIG. 1.

7 is a cross-sectional view taken along line DD of FIG.

[Explanation of symbols]

1 Exterior casing 2 compression mechanism 3 compressor case 4 front head 5 Front side block 6 rear side block 7 cylinders 8 Inhalation chamber 9 Discharge chamber 10 Inhalation port 11 Discharge port 12 rotor 13 rotor shaft 14, 15 bearings 16 vane groove 17 vanes 18 compression chamber 19 Inhalation passage 20 suction port 21 Cylinder discharge hole 22 Reed valve 23 Discharge chamber 24 High pressure gas passage 25 oil separator 26 oil sump 27 oil hole 28 Vane back pressure space 29 Saray groove 30 check valves 31 valve seat bush 32 valve 33 Valve mounting hole 34 valve passage 35 valve seat 36 Protrusion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuhiro Fujiyama             1-8 Nakase, Nakase, Mihama-ku, Chiba City, Chiba Prefecture             Ico Instruments Co., Ltd. (72) Inventor Kaori Murakami             1-8 Nakase, Nakase, Mihama-ku, Chiba City, Chiba Prefecture             Ico Instruments Co., Ltd. F term (reference) 3H029 AA05 AA17 AB03 BB43 CC04                       CC06 CC09 CC12 CC13 CC22                       CC23 CC24 CC73                 3H040 AA07 AA09 BB05 BB11 DD08                       DD11 DD12 DD18 DD19 DD20

Claims (2)

[Claims] 1. A front head attached to an open end of a compressor case, a cylinder interposed between a front side block facing an inner surface of the front head and a rear side block located behind the front side block, and A rotor horizontally rotatably mounted in the cylinder, a vane provided so as to be retractable from the outer peripheral surface of the rotor toward the inner peripheral surface of the cylinder, and communicates with the bottom of the vane, and It consists of a vane back pressure space that supplies vane back pressure to the bottom, and a small chamber inside the cylinder that is partitioned by the cylinder, side block, rotor, and vane.
The compression chamber that sucks and compresses the refrigerant in the suction chamber due to this volume change is press-fitted into the valve mounting hole formed in the front side facing surface of the front side block, and the suction chamber and the vane back pressure space Valve passages that communicate between
And a valve seat bush having a valve seat portion formed in the middle of the valve passage, and a valve seat bush disposed in the valve passage and having a pressure in the suction chamber that is higher than a pressure in the vane back pressure space. And a valve body that opens the valve passage away from the valve seat portion due to this pressure difference when integrally provided on the inner surface of the front head, and
A gas compressor comprising: a protrusion arranged on a side opposite to a tip portion of the valve seat bush. 2. A front head attached to an opening end of a compressor case, a cylinder inserted between a front side block facing an inner surface of the front head and a rear side block located behind the front side block, A rotor horizontally rotatably mounted in the cylinder, a vane provided so as to be retractable from the outer peripheral surface of the rotor toward the inner peripheral surface of the cylinder, and communicates with the bottom of the vane, and It consists of a vane back pressure space that supplies vane back pressure to the bottom, and a small chamber inside the cylinder that is partitioned by the cylinder, side block, rotor, and vane.
A compression chamber that sucks and compresses the refrigerant in the suction chamber due to this volume change is integrally provided on the inner side surface of the front head, and is press-fitted into a valve mounting hole formed in the front side facing surface of the front side block. A valve seat communicating with the suction chamber and the back pressure space of the vane; and a valve seat bush having a valve seat portion formed in the middle of the valve passage; A valve body that opens the valve passage away from the valve seat portion by the pressure difference when the pressure in the suction chamber becomes higher than the pressure in the vane back pressure space. A gas compressor characterized in that.