JP3195532B2 - Gas compressor - Google Patents

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 in a car air conditioner and the like, and more particularly to a gas compressor which can reliably prevent a backflow of a refrigerant gas and can reduce the cost.

[0002]

2. Description of the Related Art Conventionally, a gas compressor of this type has a hermetically closed housing 1 as shown in FIG. 4, for example. Front head part 101
It is composed of

A compressor body 2 is housed in a casing 100 in a housing 1. The compressor body 2 draws refrigerant gas from a suction port 3, compresses the refrigerant gas, and discharges the compressed gas to a discharge port 4. It is configured.

The suction port 3 is provided on a front head portion 101 of the housing 1, and the discharge port 4 is provided on a casing portion 100 of the housing 1.

[0005] A check valve 5 is provided in the suction port 3 and is provided to prevent the backflow of the refrigerant gas when the compression of the compressor body 2 is stopped. 5
As shown in FIG. 7, the guide case 500, the valve body 501, the stopper 503 and the spring 502 are composed of four independent parts.

During the compression operation of the compressor body 2, the valve body 501 is driven by the dynamic pressure of the refrigerant gas flowing through the suction port 3.
Slides along the guide case 500 and is urged toward the guide case bottom 500a. In this position, the valve 5
01, the window 500b of the guide case 500, 5
00b..., The suction port 3 is opened, and the suction of the refrigerant gas from the suction port 3 to the compressor body 2 is performed.

On the other hand, when the compression operation of the compressor body 2 is stopped, the dynamic pressure of the refrigerant gas flowing through the suction port 3 is lost, so that the valve body 501 slides along the guide case 500 by the force of the spring 502 and the stopper 503 side. It is abutted and urged. When the valve body 501 is at such a position, the suction port 3 is closed, and the backflow of the refrigerant gas from the suction port 3 to the evaporator side (not shown) outside the machine is prevented.

In order to fix the check valve 5 to the suction port 3, a guide case 500, a spring 5
02, after inserting the valve body 501 into a fixed position,
The stopper 503 is to be press-fitted.

[0009]

However, in such a conventional gas compressor, since the guide case 500 of the check valve 5 is formed as an independent part by deep drawing and is thin, the guide case 500 is not provided. When the case bottom portion 500a and the abutment surface 101a of the front head portion 101 are brought into contact with each other to eliminate the backlash of the guide case 500, the stopper 50 is used.
3 when press-fitting, the guide case end 500a
Is pressed, the guide case 500 may be deformed. When the guide case 500 is deformed in this way, the valve body 501 cannot be smoothly slid, and the original function of the check valve 5 (prevention of the backflow of the refrigerant gas at the time of stopping the compression) is impaired, and the backflow of the refrigerant gas is reliably performed. Can not be prevented.

As means for solving the above-mentioned problems, it is conceivable to apply a rigid guide case which does not deform, or to press-fit the guide case itself into the suction port by providing a margin for the guide case. When the means is applied, the guide case becomes expensive, and the cost of the device is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas compressor which can surely prevent a backflow of a refrigerant gas and can reduce the cost.

[0012]

In order to achieve the above object, the present invention is housed in a housing, sucks a refrigerant gas from a suction port side provided in the housing, compresses the refrigerant gas, and discharges the compressed gas. The compressor body and the suction port are provided in the suction port, and the suction port is opened during the compression operation of the compressor body, and the suction port is closed when the compression of the compressor body is stopped, so that the refrigerant gas flows backward. Wherein the check valve slides to a position to open the suction port during a compression operation of the compressor body, while the compressor body includes a check valve. during the stop of the compression and the valve body abutting-contact with the stopper which is press-fitted and fixed to slide inside the inlet port at a position of the suction port is closed, the inside of the housing, the upper
Drilling with a gas passage between the stopper and
And a guide portion which is formed concentrically with the suction port and guides the sliding operation of the valve element.

According to the present invention, since the guide portion is formed as an integral part of the housing, the guide portion does not rattle, and the guide portion is pressed to remove such rattling of the guide portion. You don't have to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas compressor according to the present invention will be described below in detail with reference to FIGS.

This gas compressor has a closed housing 1 as shown in FIG. 1, and the housing 1 includes a casing part 100 having an open end and a front head part 101 attached to the open end of the casing part 100. Further, a compressor body 2 is housed in a casing 100 in the housing 1.

The compressor body 2 has a front side block 200 and a rear side block 201, and an inner elliptical cylinder 202 (see FIG. 2) is inserted between the two side blocks 200, 201.

In a cylinder chamber 203 formed by a front side block 200, a rear side block 201, and a cylinder 202, a rotor 204 is rotatably mounted horizontally.
And the rotor shaft 205 has two side blocks 200, 2
01 are supported by bearings 206 and 207.

As shown in FIG. 2, the rotor 204 is formed with radially slit-shaped vane grooves 208, 208, and the vanes 209, 208 are formed in the vane grooves 208, 208, respectively.
09 ... are mounted so that they can move forward and backward.
Are urged toward the inner wall of the cylinder 202 by the centrifugal force caused by the rotation of the rotor 204 and the oil pressure at the bottom of the vane groove.

The cylinder chamber 203 is partitioned into a plurality of small chambers by vanes 209, 209. These small chambers are referred to as compression chambers 203a, 203a,..., And the volume of the volume is repeatedly changed by the rotation of the rotor 204, and the volume change causes the refrigerant gas to be sucked in from the suction port 3 side. Outlet 210 of 202,
It is discharged to the discharge port 4 side via the discharge valve 211 and the like.

That is, the compressor body 2 includes the rotor 204
Rotates, the refrigerant gas is sucked from the suction port 3 side,
This is configured to be compressed and discharged to the discharge port 4 side.

As shown in FIG . 3, a check valve 5 is provided in the suction port 3, and a valve body 501 of the check valve 5 is provided so as to be slidable back and forth toward the suction port 3. At the same time, the distal end 501a is disposed so as to face the downstream open end 3a of the suction port 3.

A guide portion 504 is provided around the periphery of the valve body 501. The guide portion 504 is provided inside the front head portion 100 via a support portion 505, as is apparent from the drawing.
As described above, the valve body 501 is formed integrally and concentrically with the suction port 3 and guides the sliding operation of the valve body 501 by slidably holding the valve body 501.

[0023] Such a forming the guide portion 504, for example, the front head portion 10 1 by aluminum die casting
When forming the the inside of the front head portion 10 1, may be provided a projection P that faces the downstream side opening end 3a of the suction port 3, then inserting a tool such as a drill from the inlet port 3 the It suffices to pierce the protruding portion P, whereby a cylindrical guide portion can be easily formed.

A stopper 503 is press-fitted and fixed in the suction port 3 on the distal end face 501a side of the valve body 501.
One end of the stopper 503 is a tip piece 501 of the valve body 501.
It is provided as a valve body contact portion 503a that can contact with b.

A spring 502 is provided inside the valve body 501. The spring 502 urges the valve body 501 toward the stopper 503, and the tip piece 501 of the valve body 501 is provided.
b is brought into contact with and in close contact with the stopper 503.

A gas passage 506 is provided between the stopper 503 and the guide portion 504.
Is opened and closed by the sliding operation of the valve body 501 . That is, when the valve body 501 and the stopper 503 are in contact with each other, the gas passage 506 is closed by the valve body 501 and the stopper 503, while when the valve body 501 slides away from the stopper 503, the gas passage 506 is opened. Thus, the suction port 3 side is connected to the compressor body 2 side.

Next, the operation of the gas compressor configured as described above will be described with reference to FIGS.

According to this gas compressor, when the operation is started, the compressor body 2 sucks the refrigerant gas from the suction port 3 side, compresses the refrigerant gas and discharges it to the discharge port 4 side.

During the compression operation of the compressor body 2, the dynamic pressure of the refrigerant gas flowing through the suction port 3 causes the valve body 501 to slide along the guide portion 504 and be urged toward the lowermost portion 504a of the guide portion 504. Thereby, the gas passage 506 is opened, and the intake port 3 side and the compressor main body 2 side are connected via the gas passage 506.

That is, during the compression operation of the compressor body 2, the valve body 501 is slid and urged to the position where the suction port 3 is opened, whereby the intake port 3 is opened, and the compression is performed from the intake port 3 side. The refrigerant gas is sucked into the machine body 2 side.

On the other hand, when the compression operation of the compressor body 2 is stopped, the dynamic pressure of the refrigerant gas flowing through the suction port 3 disappears, so that the valve body 501
4, the gas passage 506 is completely closed and closed by the valve body 501 and the stopper 503.

As described above, when the compression of the compressor body 2 is stopped,
The valve body 501 is slid and biased to a position where the suction port 3 is closed, thereby closing the suction port 3 and preventing the backflow of the refrigerant gas from the suction port 3 to the evaporator side (not shown) outside the machine. Is done.

[0033] In the gas compressor of this embodiment is obtained by integrally forming the guide portion 504 of the valve body 501 to the inside of the front head portion 10 1. Since the guide portion 504 is configured as Therefore one piece with the front head portion 10 1, there is no backlash in the guide portion 504, the guide portion in order to remove the looseness of such guide portion 504 There is no need to press 504. Therefore, the deformation due to the pressing of the guide portion 504 and the valve body 50 due to this deformation
1 can be prevented from sliding, the valve body 501 can be smoothly slid, and the backflow of the refrigerant gas can be reliably prevented.

Further, according to this embodiment, the valve body 501
The guide portion 504 rather than separate and independent components, from those provided as part of the front head portion 10 1, the more the number of parts is reduced, thereby also the cost of equipment by reducing the number of parts.

The compressor body 2 may have any structure as long as it sucks the refrigerant gas from the suction port 3 side and compresses and discharges the compressed gas, and is not limited to the one provided with the vane 209.

[0036]

In the gas compressor according to the present invention,
Guide of valve body is concentric with intake port inside housing
It is formed in one piece. For this reason, since the guide portion is configured as an integral part of the housing, the guide portion does not rattle, and there is no need to press the guide portion to remove such rattling of the guide portion. Therefore, deformation due to the pressing of the guide portion and poor sliding of the valve body due to the deformation can be prevented, smooth sliding of the valve body can be obtained, and backflow of the refrigerant gas can be reliably prevented.

According to the present invention, since the guide portion is provided not as a separate component but as a part of the housing, the number of components is reduced accordingly, and the cost of the apparatus can be reduced by reducing the number of components. I can do it.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 1;

FIG. 4 is a sectional view of a conventional gas compressor.

FIG. 5 is an enlarged view of a portion B in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Compressor main body 3 Suction port 5 Check valve 501 Valve body 504 Guide part

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yasuhiro Sakurai 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Corporation (56) References JP-A-5-195967 (JP, A) JP-A-2 −264177 (JP, A) Fully open sho 60-100592 (JP, U) Really open sho 52-152111 (JP, U)

Claims (1)

(57) [Claims] A compressor main body that is housed in a housing, sucks refrigerant gas from a suction port side provided in the housing, compresses and discharges the refrigerant gas, and is provided in the suction port; A gas compressor comprising a check valve that opens the suction port during the compression operation of the compressor body and closes the suction port to prevent the backflow of the refrigerant gas when the compression of the compressor body is stopped. The check valve slides to a position to open the suction port when the compressor body is performing a compression operation, and slides to a position to close the suction port when the compressor body stops compression. And a valve body that comes into contact with or closely contacts a stopper press-fitted and fixed in the suction port, and a gas passage between the stopper and the inside of the housing.
A gas compressor, comprising: a guide portion that is formed integrally and concentrically with the suction port by a hole such as a drill with a passage therebetween, and that guides a sliding operation of the valve body.