JP2527212Y2 - Check valve in gas compressor - Google Patents

Description

[Detailed description of the invention] << Industrial application field >> This invention relates to a check valve mounted on a gas compressor,
In particular, the present invention facilitates the exchange work of the check valve and the like, and prevents the backflow of the refrigerant gas as much as possible.

<< Prior Art >> Conventionally, as shown in FIG. 2, this type of gas compressor 1 is configured to constitute a refrigeration cycle 5 in combination with, for example, a condenser 2, an expansion valve 3, and an evaporator 4, and the gas compression thereof is performed. The compressor 1 has a compressor body 6 as shown in FIG.
Is surrounded by a casing 7 having an open end.

Further, according to the compressor body 6, a cylinder chamber 11 is formed by the cylinder 8, the front side block 9, and the rear side block 10 of the inner peripheral elliptic cylinder, and the cylinder chamber 11 is supported by the rotor shaft 12 in the cylinder chamber 11. Rotatable rotor 13
The rotor 13 is provided with five non-illustrated vanes fitted radially, and these vanes rotate together with the rotor 13 while closely contacting the inner peripheral wall of the cylinder chamber 11 to remove the refrigerant gas. It is configured to compress.

Further, a front head 14 is attached to an open end of the casing 7, and a suction chamber 15 is formed on the inner surface side of the front head 14, and a suction hole 16 is formed in the front head 14. According to 16, one end 16 a is opened to the outside, and the other end 16 b is opened to the suction chamber 15.

An elbow 17 is attached as a pipe joint to one end 16a of the suction hole 16, and a connection portion 17a of the elbow 17 is provided.
The evaporator 4 of the refrigeration cycle 5 is provided as shown in FIG.
Are connected to each other.

Therefore, according to the gas compressor 1 configured as described above, the refrigerant gas from the evaporator 4 flows into the suction chamber 15 through the pipe, the elbow 17 and the suction hole 16 as a compression operation, and The refrigerant gas inside the cylinder flows into the cylinder chamber 11 constituting the compressor body 1 as shown by the solid line arrow in FIG. 3, and the refrigerant gas in the cylinder chamber 11 is compressed together with the lubricating oil by a vane (not shown), The refrigerant gas is discharged from the discharge hole 19 of the casing 7 to the condenser 2 via the oil separator 18 as shown by a dotted arrow in FIG.

By the way, in the gas compressor 1 configured as described above, when the above-described compression operation is stopped, the high-temperature and high-pressure refrigerant gas discharged to the condenser 2 is subjected to gas compression in a manner opposite to the compression operation. Backflow to the evaporator 4 side through the machine 1 is unavoidable, so that the evaporator 4 is heated. As a result, so-called hot-up occurs in which warm air is blown in place of the cool air originally blown from the evaporator 4, and according to the above-described reverse flow of the refrigerant gas, more lubricating oil than necessary is required in the cylinder chamber 11. Mixed into
As a result, when the compressor is restarted, oil compression occurs, causing an excessive start-up torque and causing abnormal noises.

Therefore, in this kind of gas compressor 1, a check valve 20 for preventing the above-mentioned refrigerant gas from flowing backward is provided on the suction hole 16 side. This will be described with reference to the drawings.

That is, the check valve 20 is a core case 21 having an upper end opening type.
The upper end 21a side of the core case 21 is fitted in the suction hole 16, while the lower end 21b side is placed in the support recess 22 in the suction chamber 15. According to the core case 21, the suction hole The pressing portion 23a of the stopper 23 provided on the inner wall 16 is brought into contact with the upper end 21a of the core case 21, and the stopper ring 24 is attached and fixed to the upper end side of the stopper 23.

The core case 21 has a long hole 25 formed in a side wall, and a valve element 26 is slidably housed in the core case 21. According to the valve element 26, a spring 27 is used. The valve 23 is always urged toward the valve seat 28 formed on the stopper 23 so as to be in close contact with the valve seat 28.

Therefore, according to the check valve 20 configured as described above, due to the pressure of the refrigerant gas flowing into the suction hole 16 from the elbow 17 side during the compression operation, the valve body 26 moves down against the urging force of the spring 27. In the suction direction, whereby the refrigerant gas in the suction hole 16 flows into the suction chamber 15 through the long hole 25 of the core case 21.

On the other hand, when the above-described compression operation is stopped, the valve element 26 is moved upward by the high-temperature and high-pressure refrigerant gas pressure flowing backward from the condenser side into the suction chamber 15 and the urging force of the spring 27. Thus, the valve element 26 is configured to be in close contact with the valve seat 28 of the stopper 23 and to prevent the refrigerant gas flowing backward from the suction chamber 15 to the suction hole 16 side.

<< Problem to be Solved by the Invention >> However, in such a conventional check valve 20, in order to fix the core case 21 with the stopper 23 as described above, it is necessary to attach a retaining ring 24. As a result, when the check valve 20 is replaced or the like, the attaching work of the check valve 20 becomes very complicated.

Further, according to the check valve 20, it is unavoidable that some gas leaks from between the valve body 26 and the valve seat portion 28 from a structural point of view. However, a stopper disposed on the inner wall of the suction hole 16 is also required.
Since the refrigerant gas leaks from between the nozzle 23 and the suction hole 16 as shown by an arrow in FIG. 4, the check valve 20 sufficiently prevents the reverse flow of the refrigerant gas by the valve body 26 and the valve seat 28. There were problems such as being unable to do so.

<< Means for Solving the Problems >> The present invention has been made in view of the above-described circumstances, and a purpose thereof is to provide a check valve that is easy to install and prevents a backflow of refrigerant gas as much as possible. In order to achieve the above object, the present invention provides a casing having an open end surrounding a compressor body, a front head attached to an open end of the casing, and an inner surface of the front head. A suction hole formed in the front head, one end of which is opened to the outside and the other end is opened in the suction chamber; and A pipe joint to which the extending pipe is connected, and compresses the refrigerant gas flowing into the suction chamber from the evaporator through the pipe, the pipe joint, and the suction hole in the compressor body. In the gas compressor, an upper end opening type core case having an upper end fitted into the suction hole and a lower end placed in the suction chamber and having a long hole in a side wall, and disposed on the inner wall of the suction hole. While having a pressing portion on one end side which is in contact with the valve seat and the upper end of the core case,
A stopper having the other end in contact with the pipe joint, a valve housed in the core case and constantly urged toward the valve seat, A joint member and a seal member abutting on the outer periphery of the stopper, wherein the pipe joint is attached to one end of the suction hole, and the core case is fixed by a holding portion of the stopper.

<< Operation >> According to the present invention, the pipe joint is attached to one end of the suction hole, and at the same time, the core case is fixed by the holding portion of the stopper, and the seal member is formed by the front head and the pipe joint having the suction hole. And between the inner wall of the suction hole and the outer periphery of the stopper.

<< Embodiment >> Hereinafter, one embodiment of the check valve according to the present invention will be described with reference to FIGS.
This will be described in detail with reference to the drawings.

Since the basic structure of the gas compressor to which this check valve is applied is the same as the conventional one, the same members are denoted by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 1, the check valve includes a core case 21 having an open upper end.
6, the lower end 21b side is placed in a support recess 22 recessed in the suction chamber 15, while a long hole 25 is formed near the center of the side wall of the core case 21. Hole 16 is slot 25
It is configured to communicate with the suction chamber 15 via the.

A stopper 40 is provided on the inner wall of the suction hole 16, and the stopper 40 is partially cut off at a lower end side thereof, and a pressing portion 41 and a valve seat portion which contact the upper end 21 a of the core case 21. 42 are formed. On the other hand, the upper end of the stopper 40 is in contact with the elbow 17 attached to the suction hole 16. According to the stopper 40, the upper end of the stopper 40 contacts the elbow 17 at the same time when the elbow 17 is attached to the suction hole 16. Thus, the stopper 40 is configured to press the core case 21 against the support concave portion 22 and fix the core case 21 with the holding portion 41.

Further, a valve body 26 is slidably disposed in the core case 21, and a spring 27 is housed therein. According to the spring 27, one end thereof is in contact with the inside of the valve body 26. , The other end is in contact with the bottom surface in the core case 21 and the valve
It is configured to urge the valve 26 toward the valve seat 42.

An O-ring 43 is provided as a seal member on the outer periphery of one end 16a of the suction hole 16 so as to abut against the elbow 17 and the outer periphery of the stopper 40.
As shown by an arrow C in the figure, the outside air flows in or flows out from the space between the front head and the elbow 17 as shown by the arrow A in FIG. It is configured to prevent the leaking refrigerant gas.

Next, the operation of the check valve configured as described above will be described in the first place.
This will be described with reference to the drawings.

That is, according to this check valve, during the compression operation of the gas compressor, the pressure of the refrigerant gas flowing from the elbow 17 into the suction hole 16 causes the valve body 26 to move downward against the urging force of the spring 27. Thereby, the refrigerant gas in the suction hole 16 operates so as to flow into the suction chamber 15 through the long hole 25 of the core case 21.

On the other hand, when the gas compressor stops the compression operation, the valve body 26 is moved upward by the high-temperature and high-pressure refrigerant gas pressure flowing backward from the condenser side into the suction chamber 15 and the urging force of the spring 27. As a result, the valve body 26 is a valve seat portion of the stopper 40.
It operates so as to prevent the refrigerant gas flowing backward from the suction chamber 15 to the suction hole 16 side in close contact with the suction chamber.

Therefore, according to the above embodiment, a holding portion is provided at the lower end side of the stopper disposed on the inner wall of the suction hole to abut against the upper end of the core case, while the upper end side of the stopper is formed so as to abut against the elbow. At the same time that the elbow is attached to the suction hole, the core case is fixed with the stopper of the stopper, so the core case can be fixed simply by attaching the elbow to the suction hole, making it easy to replace the check valve Can be done.

Further, in the above embodiment, since the O-ring disposed on the outer periphery of the suction hole is configured to contact the elbow and the outer periphery of the stopper, the O-ring flows from between the front head having the suction hole and the elbow. In addition to shutting off the outside air or the refrigerant gas flowing out, especially when the refrigerant gas is flowing backward, the leakage of the refrigerant gas between the inner wall of the suction hole and the outer periphery of the stopper is completely prevented, and the backflow of the refrigerant gas is sufficiently prevented. At the valve body and the valve seat.

<< Effects of the Invention >> As described above, the check valve according to the present invention is provided with a holding portion which comes into contact with the upper end of the core case at one end of the stopper provided on the inner wall of the suction hole, and connects the other end of the stopper with a pipe joint. The core case can be fixed simply by attaching the elbow to the suction hole because the core case is fixed to the holding part of the stopper at the same time that the pipe joint is attached to the suction hole. Replacement of the check valve can be easily performed.

Further, in this check valve, since the seal member arranged on the outer periphery of the suction hole is configured to abut on the pipe joint and the outer periphery of the stopper, the front head provided with the suction hole and the pipe joint are connected. In addition to shutting off the outside air flowing in from the outside or the refrigerant gas flowing out, especially at the time of the backflow of the refrigerant gas, leakage of the refrigerant gas between the inner wall of the suction hole and the outer periphery of the stopper is completely prevented, and the refrigerant gas is prevented. Can be sufficiently prevented by the valve body and the valve seat.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a check valve according to the present invention, FIG. 2 is an explanatory view illustrating a refrigeration cycle, FIG. 3 is a cross-sectional view of a gas compressor equipped with a conventional check valve, and FIG. It is an expanded sectional view of the conventional non-return valve. 1 ... gas compressor 6 ... compressor body 7 ... casing 14 ... front head 15 ... suction chamber 16 ... suction hole 17 ... elbow 21 ... core case 25 ... long hole 26 ... valve body 40 Stopper 41 Holder 42 Valve seat 43 O-ring

Claims (1)

(57) [Scope of request for utility model registration] A casing having an open end surrounding the compressor body; a front head attached to an open end of the casing; a suction chamber formed on an inner surface side of the front head; A suction hole, one end of which is open to the outside and the other end of which is open to the suction chamber, and a pipe joint attached to one end of the suction hole and connected to a pipe extending from an evaporator of the refrigeration cycle, In a gas compressor for compressing refrigerant gas flowing from an evaporator into a suction chamber through a pipe, a pipe joint, and a suction hole in the compressor body, an upper end is fitted into the suction hole and a lower end is positioned in the suction chamber. A core case having an opening at an upper end and having a long hole in a side wall; a valve seat portion provided on an inner wall of the suction hole; A stopper having a holding portion abutting on the upper end of the pipe, and a stopper having the other end abutting on the pipe joint; a valve body housed in the core case and constantly urged toward the valve seat portion; A seal member disposed on the outer periphery of the suction hole and abutting against the outer periphery of the pipe joint and the stopper, wherein the pipe joint is attached to one end of the suction hole and the core case is fixed by the stopper of the stopper. A check valve in a gas compressor.