CN212131421U - Low-temperature pneumatic stop valve with non-return function - Google Patents

Abstract

The utility model discloses a low-temperature pneumatic stop valve with a non-return function, which belongs to the technical field of low-temperature valves and comprises a pneumatic control mechanism and a valve body connected with the pneumatic control mechanism, a valve core capable of blocking liquid in the valve body is arranged in the valve body, a non-return cavity is arranged in the valve core, a first liquid inlet and a second liquid inlet which are communicated with the non-return cavity and the interior of the valve body are also arranged on the valve core, the non-return cavity is communicated with a liquid inlet end of the valve body through the first liquid inlet, the non-return cavity is communicated with a liquid outlet end of the valve body through the second liquid inlet, a non-return core capable of being disconnected between the first liquid inlet and the second liquid inlet is also arranged in the non-return cavity, the effect of balancing the pressure at two ends of the valve body is realized by arranging the non-return core and the non-return spring in the valve core and forming, the problem of current stop valve can't automatic balance both ends atmospheric pressure difference after ending liquid is solved.

Description

Low-temperature pneumatic stop valve with non-return function

Technical Field

The utility model belongs to the technical field of the low temperature valve, concretely relates to take pneumatic stop valve of low temperature of non return function.

Background

The stop valve, also called a stop valve, is one of the most widely used valves, is durable due to small friction force between sealing surfaces in the opening and closing process, is easy to manufacture and convenient to maintain due to small opening height, and is suitable for medium and low pressure as well as high pressure; because the related law of China stipulates that the flow direction of the stop valve is uniformly from top to bottom, the stop valve has directionality during installation; the closing principle of the stop valve is that the valve clack sealing surface in the valve body is tightly attached to the valve seat sealing surface at the bottom of the valve core by means of the pressure of the valve rod, and therefore medium circulation is prevented.

In some special use scenarios, such as a low temperature experiment system, a stop valve is used to stop the supply of the cryogenic liquid, but after the stop valve stops the liquid flow, the cryogenic liquid (such as liquid nitrogen, liquid neon, etc.) in the pipeline absorbs the heat in the atmosphere, then rises to normal temperature and regasifies again, and the volume of the cryogenic liquid after regasification expands sharply, which further damages the pipeline and reduces the service life and air tightness of the system.

At present, the stop valve used in the industry cannot automatically balance pressure difference when the pressure at two ends is overlarge, so that the service life of a pipeline can be inevitably influenced by using the stop valve in a low-temperature experiment system.

Disclosure of Invention

An object of the utility model is to provide a possess and can be according to the low temperature pneumatic stop valve of threshold value automatically regulated both ends pressure difference simultaneously by the function.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a take pneumatic stop valve of low temperature of non return function, includes pneumatic control mechanism and the valve body of being connected with it, install the case that can block liquid in the valve body, it has the non return cavity to open in the case, has still opened the inside first inlet and the second inlet of intercommunication non return cavity and valve body on the case, the non return cavity is held the intercommunication through the feed liquor of first inlet and valve body, and the non return cavity is held the intercommunication through the play liquid of second inlet and valve body, still install the non return core that can be connected between first inlet of toward disconnection and the second inlet in the non return cavity.

Furthermore, a non-return spring is installed in the non-return core, one end of the non-return spring is connected with the non-return core, the other end of the non-return spring is connected with the valve core, and one end, provided with the non-return spring, of the non-return core is matched with the non-return cavity.

Furthermore, one end of the check core close to the second liquid inlet is provided with an elastic sealing block.

Furthermore, an elastic sealing block is also arranged at one end of the valve core for sealing the valve body.

Furthermore, the valve body is sleeved with a shell, and a vacuum heat-insulating layer is formed between the shell and the valve body.

Further, the vacuum insulation layer is filled with a heat insulation material.

Compared with the prior art, the utility model realizes the effect of balancing the pressure at the two ends of the valve body while stopping the liquid by arranging the non-return core and the non-return spring in the valve core and forming the hole on the valve core, thereby preventing the pipelines at the two ends of the valve body from being damaged due to overlarge pressure; the two holes are formed in the valve core, so that the pressure at the two ends of the valve body can be balanced in two directions; the elastic sealing blocks are arranged at the bottoms of the check core and the valve core, so that the tightness of the check core and the valve core is further enhanced; through set up the shell and make the vacuum heat preservation outside the valve body, set up thermal-insulating material in the vacuum heat preservation simultaneously, very big reduction the utility model discloses a cold volume scatters and disappears.

Drawings

Fig. 1 is a schematic view of the longitudinal section structure of the present invention.

Fig. 2 is an enlarged view of a portion a of fig. 1.

The labels in the figure are: 100-a pneumatic control mechanism, 110-a valve rod, 210-a valve body, 220-a valve core, 221-a check cavity, 222-a first liquid inlet, 223-a second liquid inlet, 230-a check core, 231-a check spring, 232-an elastic closing block, 300-a shell, 310-a vacuum insulation layer and 320-a heat insulation material.

Detailed Description

As shown in fig. 1-2, the present embodiment provides a low-temperature pneumatic stop valve with a check function, which includes a pneumatic control mechanism 100, a valve stem 110, a valve body 210, a valve core 220, a check cavity 221, a first liquid inlet 222, a second liquid inlet 223, a check core 230, a check spring 231, an elastic closing block 232, a housing 300, a vacuum insulation layer 310 and a thermal insulation material 320.

A valve core 220 capable of intercepting liquid in the valve body 210 to realize an intercepting function is installed in the valve body 210, the pneumatic control mechanism 100 is connected with the valve core 220, the driving end of the pneumatic control mechanism 100 is connected with the valve core 220 through the valve rod 110, to push the valve core 220 downward to close the portion of the valve body 210 that matches the valve core 220 to achieve the interception of the valve, the pneumatic control mechanism 100 generally employs an air cylinder, the valve body 210 is sleeved with a shell 300, a vacuum insulation layer 310 is formed between the housing 300 and the valve body 210, the vacuum insulation layer 310 is filled with a heat insulating material 320, the housing 300 is also sleeved on the pipeline connected to the valve body 210, so that the vacuum insulation layer 310 outside the valve body 210 and the vacuum insulation layer 310 outside the pipeline are connected into a whole to reduce the joints outside the vacuum insulation layer 310, and the function of reducing the loss of cold energy is achieved.

The liquid in the valve body 210 flows in the direction shown in fig. 2, a check cavity 221, a first liquid inlet 222 for communicating the check cavity 221 with the liquid inlet end of the valve body 210, and a second liquid inlet 223 for communicating the check cavity 221 with the liquid outlet end of the valve body 210 are formed in the valve core 220, the first liquid inlet 222 is located on the side wall of the valve core 220, the second liquid inlet 223 is located at the bottom of the valve core 220, and a check core 230 capable of reciprocating is further installed in the check cavity 221.

Check spring 231 is installed on check core 230, one end of check spring 231 is connected with check core 230, the other end is connected with the top end of check cavity 221, check spring 231 is partially located inside check core 230, one end of check core 230 where check spring 231 is installed is in sliding fit with check cavity 221, the diameter of the other end of check core 230 is smaller than the inner diameter of check cavity 221, elastic closing block 232 used for enhancing the sealing performance is installed at one end of check core 230 close to second liquid inlet 223, check core 230 is provided with a transverse through hole so that the pressure effect of liquid flowing into check cavity 221 on check core 230 is more uniform, and elastic closing block 232 used for enhancing the sealing performance is also installed at one end of valve element 220 close to second liquid inlet 223.

The utility model discloses specific operating condition is as follows:

as shown in fig. 1-2, the utility model discloses need install on carrying low temperature liquid pipeline, promote valve rod 110 through pneumatic control mechanism 100 to drive case 220 and move down the part that matches with case 220 on the closed valve body 210, thereby realize the function of stop valve, this part is ripe prior art, no longer gives unnecessary details.

When the liquid in the pipeline flows through the first inlet port 222 or the second inlet port 223, the liquid in the pipeline enters the valve core 220 through the first inlet port 222 or the second inlet port 223 and acts on the check core 230, when the liquid pressure entering the valve core 220 is greater than the pressure applied to the check core 230 by the check spring 231, the check core 230 is jacked up, meanwhile, the first inlet port 222 and the second inlet port 223 are communicated with each other through the check cavity 221, so that the liquid with higher pressure intensity flows into the end with lower pressure intensity, thereby realizing the effect of releasing the liquid pressure exceeding the threshold value, when the liquid with higher pressure intensity passes through the outflow part of the liquid, the road roller of the part of the liquid is restored to the level lower than the pressure of the check spring 231, then the check spring 231 presses the check core 230 on the second check inlet port 223 again to seal the second inlet port 223, the connection between the second inlet port 223 and the check cavity 221 is disconnected, the utility model discloses get back to the off-state again.

The above is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and the utility model should be covered in the protection scope of the present invention.

Claims (6)

1. The utility model provides a take non return function's pneumatic stop valve of low temperature, includes valve body (210), installs in valve body (210) and can block case (220) of liquid in valve body (210), case (220) are connected with pneumatic control mechanism (100), its characterized in that: the check valve is characterized in that a check cavity (221) and a first liquid inlet (222) communicated with the liquid inlet end of the check cavity (221) and the liquid outlet end of the valve body (210) and a second liquid inlet (223) communicated with the liquid outlet end of the check cavity (221) are formed in the valve core (220), a check core (230) capable of being disconnected between the second liquid inlet (223) and the check cavity (221) is installed in the check cavity (221), and the check core (230) is connected with the top of the check cavity (221) through a check spring (231).

2. Cryogenic pneumatic stop valve with check function according to claim 1, characterized in that: one end of the check core (230) provided with the check spring (231) is matched with the check cavity (221).

3. Cryogenic pneumatic stop valve with check function according to claim 1 or 2, characterized in that: and one end of the check core (230) close to the second liquid inlet (223) is provided with an elastic sealing block (232).

4. Cryogenic pneumatic stop valve with check function according to claim 3, characterized in that: an elastic sealing block (232) is also arranged at one end of the valve core (220) close to the second liquid inlet (223).

5. Cryogenic pneumatic stop valve with check function according to claim 1, 2 or 4, characterized in that: a shell (300) is sleeved outside the valve body (210), and a vacuum heat-insulating layer (310) is formed between the shell (300) and the valve body (210).

6. Cryogenic pneumatic stop valve with check function according to claim 5, characterized in that: and the vacuum insulation layer (310) is filled with a heat insulation material (320).

Images