CN216986362U

CN216986362U - Cold trap device

Info

Publication number: CN216986362U
Application number: CN202220343657.8U
Authority: CN
Inventors: 赫梓宇
Original assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Current assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-07-19
Anticipated expiration: 2032-02-18

Abstract

The utility model discloses a cold trap device which comprises an upper end cover flange, a cold trap inner container, a cold trap outer shell, a first connecting port, a second connecting port, a gas discharging passage and a refrigerant liquid level height control element, wherein a storage cavity for containing a refrigerant is arranged in the cold trap inner container, the upper end cover flange is connected to an opening in the top of the cold trap inner container in a sealing mode, a refrigerant inlet is formed in the upper end cover flange, and the cold trap inner container is connected to the inside of the cold trap outer shell in a sealing mode. The gas discharge passage and the refrigerant liquid level control element can effectively control the liquid level, so that the problems of refrigerant overflow and possible freezing and blockage of the cold trap passage caused by overhigh liquid level are avoided, the liquid level does not need to be observed and judged manually, and the operation is simple and convenient.

Description

Cold trap device

Technical Field

The utility model relates to the technical field of gas trapping, in particular to a cold trap device.

Background

A cold trap is a trap for collecting gas by condensation on a cooling surface, and is generally made of a material such as metal, and belongs to a cooling device. The cold trap device is generally constructed in such a manner that a U-shaped tube is placed in a refrigerant, and when gas passes through the U-shaped tube, a substance with a higher melting point is changed into a liquid, and a substance with a lower melting point passes through the U-shaped tube in a gas form. Thereby playing a role of separation. Commonly used refrigerants include liquid nitrogen and the like. Generally, the liquid level in the liquid nitrogen cold trap needs to be within a certain height range, and if the liquid level is too low, a good gas condensation effect cannot be achieved; if the liquid level is too high, not only will the cryogen overflow, but also the cold trap passage may freeze and clog. The conventional cold trap is usually ensured to have a certain limitation by adopting an artificial observation and judgment method to ensure the liquid level height of the cold trap.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cold trap device aiming at the defect that the liquid level of a cold trap in the prior art needs to be observed and judged manually.

The technical scheme adopted for realizing the purpose of the utility model is as follows:

a cold trap device comprises an upper end cover flange, a cold trap liner, a cold trap shell, a first connecting port, a second connecting port, a gas discharge passage and a refrigerant liquid level height control element, wherein a storage cavity for containing a refrigerant is arranged in the cold trap liner, the upper end cover flange is connected to an opening at the top of the cold trap liner in a sealing mode, a refrigerant inlet is formed in the upper end cover flange, and the cold trap liner is connected to the inside of the cold trap shell in a sealing mode;

the lower part of the cold trap shell is provided with a second connecting port for connecting a gas inflow pipeline, the upper part of the cold trap shell is provided with a first connecting port for connecting a gas outflow pipeline, and the gas discharge passage and the refrigerant liquid level control element are positioned at 1/2-2/3 of the cold trap inner container.

In the technical scheme, the cold trap inner container and the cold trap outer shell are fixedly connected in a sealing mode in a welding mode, and a condensation cavity is formed between the cold trap inner container and the cold trap outer shell.

In the above technical solution, the first connection port and the second connection port both adopt quick connection flanges.

In the above aspect, the gas discharge passage and the refrigerant level control element are located between the first connection port and the second connection port.

In the above technical solution, the gas discharge passage and the refrigerant level control element include a gas outlet nozzle, a refrigerant discharge valve and a refrigerant discharge pipe, the refrigerant discharge pipe passes through the cold trap housing and the cold trap inner container in a sealing manner, an internal port of the refrigerant discharge pipe is communicated with the storage cavity, and an external port is located outside the cold trap housing and connected to the gas outlet nozzle through the refrigerant discharge valve.

In the technical scheme, the upper end cover flange and the cold trap liner are connected through bolts in a fastening mode.

In the technical scheme, a sealing gasket is arranged between the upper end cover flange and the cold trap inner container.

In the technical scheme, the cold trap inner container comprises a cylindrical inner container and a flange positioned at the top of the inner container, and the inner container and the flange are of an integrated structure.

In the technical scheme, the upper end cover flange is fixed on the top surface of the flange, the cold trap shell is sleeved outside the inner container, and the top of the cold trap shell is welded on the bottom surface of the flange in a sealing mode.

In the technical scheme, the center of the bottom of the upper end cover flange is convexly embedded on the top opening of the flange, and the outer edge of the upper end cover flange is fixed on the top of the flange through bolts.

Compared with the prior art, the utility model has the beneficial effects that:

1. the gas discharge passage and the refrigerant liquid level control element can effectively control the liquid level, so that the problems of refrigerant overflow and possible freezing and blockage of the cold trap passage caused by overhigh liquid level are avoided, the liquid level does not need to be observed and judged manually, and the operation is simple and convenient.

2. The cold trap device has simple structure and easy maintenance, and all parts can be detached and replaced, thereby reducing the maintenance cost of the equipment.

3. The use method of the cold trap device is simple to operate, and can effectively reduce the danger of the refrigerant in the use process.

Drawings

Fig. 1 is a schematic structural diagram of a cold trap device.

In the figure: 1-upper end cover flange, 2-bolt, 3-sealing gasket, 4-refrigerant inlet, 5-cold trap inner container, 6-cold trap outer shell, 7-first connecting port, 8-second connecting port, 9-gas outlet nozzle, 10-refrigerant discharge valve, 11-refrigerant discharge pipe, 12-storage cavity, 13-condensation cavity, 14-internal port and 15-external port;

5-1-inner container and 5-2-flange.

Detailed Description

The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Example 1

A cold trap device, as shown in figure 1, comprises an upper end cover flange 1, a cold trap inner container 5, a cold trap outer shell 6, a first connecting port 7, a second connecting port 8, a gas discharge passage and a refrigerant liquid level height control element. The cold trap device is characterized in that a storage cavity 12 for containing a refrigerant is arranged in the cold trap liner 5, the refrigerant is liquid nitrogen, the upper end cover flange 1 is connected to the top opening of the cold trap liner 5 in a sealing mode, a refrigerant inlet 4 is formed in the upper end cover flange 1, the cold trap liner 5 is connected to the inside of the cold trap shell 6 in a sealing mode, specifically, the cold trap liner 5 is fixedly connected in a sealing mode in a welding mode, therefore, the air passage of the cold trap device is sealed, and a condensation cavity 13 is formed between the cold trap liner 5 and the cold trap shell 6.

First connector 7 and second connector 8 all adopt quick-connect flange, 6 lower parts of cold-trap shell are provided with second connector 8, second connector 8 is used for connecting gaseous inflow pipeline, 6 upper portions of cold-trap shell are provided with first connector 7, first connector 7 is used for connecting gaseous outflow pipeline.

The gas exhaust passage and the refrigerant level control element are located at 1/2-2/3 of the cold trap liner 5, specifically, the gas exhaust passage and the refrigerant level control element are located between the first connection port 7 and the second connection port 8, preferably, in actual application, the liquid nitrogen level is located at 2/3 of the cold trap, and at this time, the gas exhaust passage and the refrigerant level control element are located at 2/3 of the cold trap liner 5.

The gas discharge passage and the refrigerant liquid level height control element comprise a gas outlet nozzle 9, a refrigerant discharge valve 10 and a refrigerant discharge pipe 11, the refrigerant discharge pipe 11 penetrates through the cold trap shell 6 and the cold trap inner container 5 in a sealing mode, an inner port 14 of the refrigerant discharge pipe 11 is communicated with the storage cavity 12, and an outer port 15 is located outside the cold trap shell 6 and connected with the gas outlet nozzle 9 through the refrigerant discharge valve 10.

When the refrigerant is injected into the cold trap, the refrigerant is added into the storage cavity 12 through the refrigerant inlet 4, the refrigerant discharge valve 10 is opened, and the gas in the cold trap is discharged from the gas outlet nozzle 9 through the refrigerant discharge pipe 11 and the refrigerant discharge valve 10. When the liquid level of the refrigerant reaches the height of the refrigerant discharge pipe 11, the refrigerant exceeding the height is discharged out of the gas body through the refrigerant discharge valve 10 and the gas outlet nozzle 9, after the phenomenon is observed by a person, the refrigerant is stopped to be added, and the refrigerant discharge valve 10 is closed when the refrigerant is not discharged any more, so that the effective control of the liquid level of the refrigerant is realized. After the gas in the condensation cavity 13 is pumped out, the mixed gas to be condensed is introduced from the second connecting port 8, part of the gas is condensed by the condensation cavity 13, and the uncondensed part is discharged from the first connecting port 7.

Example 2

In order to enable the cold trap device to be better sealed, on the basis of embodiment 1, the upper end cover flange 1 and the cold trap liner 5 are fastened and connected through bolts 2 to achieve sealing, and specifically, a sealing gasket 3 is arranged between the upper end cover flange 1 and the cold trap liner 5 to further improve the sealing effect.

The cold trap inner container 5 comprises a cylindrical inner container 5-1 and a flange 5-2 located at the top of the inner container 5-1, the inner container 5-1 and the flange 5-2 are of an integral structure, the upper end cover flange 1 is fixed on the top surface of the flange 5-2, the cold trap outer shell 6 is sleeved outside the inner container 5-1, and the top of the cold trap outer shell 6 is welded on the bottom surface of the flange 5-2 in a sealing mode.

The center of the bottom of the upper end cover flange 1 is embedded on the top opening of the flange 5-2 in a protruding mode, and the outer edge of the upper end cover flange 1 is fixed to the top of the flange 5-2 through bolts 2.

Example 3

A method for using a cold trap device according to embodiment 1 and embodiment 2, comprising the steps of:

and step 1, tightly connecting the upper end cover flange 1 and the cold trap inner container 5 in a sealing manner by using bolts 2.

And 2, connecting the first connecting port 7 with the gas outflow pipeline, connecting the second connecting port 8 with the gas inflow pipeline, and then evacuating the gas in the condensation cavity 13.

And 3, opening the refrigerant discharge valve 10, and injecting the refrigerant into the cold trap device through the refrigerant inlet 4.

And 4, when the liquid level of the refrigerant reaches the position of the refrigerant discharge pipe 11, discharging the refrigerant from the air outlet, stopping injecting the refrigerant, and closing the refrigerant discharge valve 10 and covering the inlet cover after the refrigerant is not discharged any more, thereby realizing liquid level control.

And 5, introducing gas from the second connecting port 8, discharging the gas condensed by the condensing cavity 13 through the first connecting port 7, storing the harmful gas in a cold trap device in a liquid state when the condensed gas is harmful gas, discharging liquid nitrogen when the condensed gas is non-harmful gas, and discharging the condensed liquid which is changed into gas again.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and adaptations can be made without departing from the principle of the present invention, and such modifications and adaptations should also be considered as the scope of the present invention.

Claims

1. A cold trap device is characterized by comprising an upper end cover flange, a cold trap inner container, a cold trap shell, a first connecting port, a second connecting port, a gas discharge passage and a refrigerant liquid level height control element, wherein a storage cavity for containing a refrigerant is arranged in the cold trap inner container;

the lower part of the cold trap shell is provided with a second connecting port for connecting a gas inflow pipeline, the upper part of the cold trap shell is provided with a first connecting port for connecting a gas outflow pipeline, and the gas discharge passage and the refrigerant liquid level control element are positioned at 1/2-2/3 parts of the cold trap inner container.

2. The cold trap device of claim 1, wherein the cold trap inner container and the cold trap outer shell are fixedly sealed by welding, and a condensation chamber is formed between the cold trap inner container and the cold trap outer shell.

3. The cold trap device of claim 1, wherein the first and second connectors are quick connect flanges.

4. The cold trap device of claim 1, wherein the gas vent passage and refrigerant level control element are located between the first connection port and the second connection port.

5. The cold trap device of claim 1, wherein the gas vent passageway and cryogen level control element comprise a gas outlet nozzle, a cryogen vent valve, and a cryogen vent tube sealed across the cold trap housing and cold trap bladder, the cryogen vent tube having an internal port in communication with the storage chamber and an external port located outside the cold trap housing connected to the gas outlet nozzle by a cryogen vent valve.

6. A cold trap device according to claim 1, wherein the upper end cap flange and the cold trap inner tank are bolted tightly.

7. The cold trap device of claim 6, wherein a gasket is disposed between the upper end cap flange and the cold trap inner tank.

8. The cold trap device of claim 1, wherein the cold trap inner container comprises a cylindrical inner container and a flange positioned at the top of the inner container, and the inner container and the flange are of an integrated structure.

9. The cold trap device of claim 8, wherein the upper end cap flange is fixed to the top surface of the flange, the cold trap housing is sleeved outside the inner container, and the top of the cold trap housing is hermetically welded to the bottom surface of the flange.

10. A cold trap device according to claim 9, wherein the top opening of the flange is fitted with a bottom center projection of the upper end cover flange, and the outer edge of the upper end cover flange is fixed to the top of the flange by bolts.