Vacuumizing joint structure with blasting reset function

Abstract

The utility model discloses a vacuumizing connector structure with a blasting reset function, which comprises a vacuumizing connecting pipe and a sealing plug, a step is arranged in the vacuumizing connecting pipe, the sealing plug is inserted into the vacuumizing connecting pipe from top to bottom and abuts against the step, a sealing ring is arranged between the sealing plug and the vacuumizing connecting pipe, and the sealing ring is connected with the vacuumizing connecting pipe. The top of the vacuumizing connecting pipe is in threaded connection with a protective cap, a compression spring is arranged between the protective cap and the sealing plug, one end of the compression spring abuts against the protective cap, the other end of the compression spring abuts against the sealing plug, and a discharge hole is formed in the side wall of the protective cap. According to the vacuumizing connector structure, the sealing plug cannot be popped out, and the blasting reset function is achieved.

Description

Technical Field

[0001] The utility model relates to the field of vacuum heat-insulated low-temperature containers, in particular to a vacuum extraction joint structure with an explosion-reset function and used on a vacuum heat-insulated low-temperature container. Background Art

[0002] At present, the requirements for thermal insulation performance of cryogenic containers and cryogenic pipelines are getting higher and higher. Vacuum insulated cryogenic containers usually include: an outer cylinder and an inner cylinder located in the outer cylinder. The interlayer between the outer cylinder and the inner cylinder is a vacuum interlayer. The vacuum interlayer is evacuated through a vacuum port set on the outer cylinder. After the vacuum is evacuated, the vacuum port is sealed by screwing in a sealing plug. The double-layer vacuum insulation structure with an outer cylinder, an inner cylinder, and a vacuum interlayer is the most stable and reliable, but the requirements for vacuum degree are getting higher and higher. Therefore, as one of the leak holes, how to reduce the leakage rate of the vacuum port and maintain the vacuum degree is of utmost importance. Under special working conditions, the double-layer vacuum insulation structure may experience vacuum loss, internal leakage, etc. As the pressure in the vacuum interlayer increases, the sealing plug will be ejected by high-pressure explosion. The ejected sealing plug is very dangerous and cannot be reset. After the sealing plug is ejected, a large amount of external air will enter the vacuum interlayer. When the medium stored in the low-temperature container is flammable gas, the external air entering the vacuum interlayer and the leaked flammable gas will mix with each other and easily cause an explosion. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a vacuum joint structure which can prevent a sealing plug from being ejected and has an explosion reset function.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: a vacuum joint structure with an explosion reset function, including: a vacuum pipe welded on an outer cylinder and connected to the vacuum interlayer, and a sealing plug, characterized in that: a step is provided in the vacuum pipe, the sealing plug is inserted into the vacuum pipe from top to bottom and abuts against the step, a sealing ring is provided between the sealing plug and the vacuum pipe for sealing, a protective cap is threadedly connected to the top of the vacuum pipe, a compression spring is provided between the protective cap and the sealing plug, one end of the compression spring abuts against the protective cap, and the other end of the compression spring abuts against the sealing plug, after the protective cap is screwed in, the sealing plug can be elastically pressed by the compression spring, and a discharge hole is provided on the side wall of the protective cap.

[0005] Furthermore, in the aforementioned vacuum joint structure with explosion reset function, three sealing rings are arranged between the sealing plug and the vacuum joint.

[0006] Furthermore, in the aforementioned vacuum joint structure with explosion-reset function, the bottommost sealing ring between the sealing plug and the vacuum joint is pressed against the step by the sealing plug.

[0007] Furthermore, in the aforementioned vacuum joint structure with explosion reset function, a discharge hole is also provided on the top of the protective cap.

[0008] Furthermore, in the aforementioned vacuum joint structure with explosion-reset function, the sealing ring is an O-ring.

[0009] The advantages of the utility model are as follows: the advantages of the vacuum joint structure are: 1. This joint structure adopts a three-layer sealing ring structure, which is more reliable and has a better sealing effect than a traditional single sealing ring; 2. The sealing plug is not fixed in the vacuum pipe with threads, so when vacuum loss, internal leakage, etc. occur, the sealing plug can be ejected by overcoming the elastic force of the compression spring to release, and the opening of explosion-proof ports at other positions can be avoided, which not only reduces the leakage points and reduces the leakage rate but also reduces the cost; 3. The protective cap is fixed on the vacuum pipe with threads, and when leakage occurs, the sealing plug can be effectively prevented from being ejected, and many discharge holes are opened on the protective cap to discharge the pressure in the vacuum interlayer to the atmosphere; 4. The compression spring can well rebound and reset the sealing plug, and the size of the explosion pressure of the vacuum interlayer can also be controlled by changing the elastic coefficient of the compression spring, while avoiding external air contamination of the vacuum interlayer after the pressure release is completed, and can also effectively protect the medium loss of the pipeline and container. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural schematic diagram of the vacuum joint structure with explosion-reset function described in the utility model. DETAILED DESCRIPTION

[0011] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0012] like Figure 1As shown, a vacuum joint structure with an explosion reset function comprises: a vacuum pipe 3 welded on an outer cylinder 1 and connected to a vacuum interlayer 2, and a sealing plug 4, a step 5 is provided in the vacuum pipe 3, the sealing plug 4 is inserted into the vacuum pipe 3 from top to bottom and abuts against the step 5, a sealing ring 6 is provided between the sealing plug 4 and the vacuum pipe 3 for sealing, a protective cap 7 is threadedly connected to the top of the vacuum pipe 3, a compression spring 8 is provided between the protective cap 7 and the sealing plug 4, one end of the compression spring 8 abuts against the protective cap 7, and the other end of the compression spring 8 abuts against the sealing plug 4, after the protective cap 7 is screwed in, the sealing plug 4 can be elastically pressed by the compression spring 8, and a discharge hole 9 is provided on the side wall of the protective cap 7.

[0013] In this embodiment, three sealing rings 6 are arranged between the sealing plug 4 and the vacuum pipe 3, and an annular groove for accommodating each sealing ring 6 is arranged on the sealing plug 4. The sealing ring 6 at the bottom between the sealing plug 4 and the vacuum pipe 3 is pressed against the step 5 by the sealing plug 4, so that better sealing can be achieved after such arrangement. A relief hole 9 is also arranged on the top of the protective cap 7, so that better pressure relief can be achieved after such arrangement. The sealing ring 6 is an O-type sealing ring.

[0014] When the vacuum interlayer becomes unstable, internal leakage and vacuum loss occur, and the pressure in the vacuum interlayer increases, the non-fixed sealing plug 4 is ejected to release the pressure to the atmosphere through the relief hole on the protective cap 7. When the relief pressure decreases, the sealing plug 4 is reset by the compression spring to re-block the vacuum pipe 3, thereby achieving automatic discharge and automatic reset.

[0015] The advantages of this vacuum joint structure are:

[0016] 1. This joint structure adopts a three-layer sealing ring structure, which is more reliable and has better sealing effect than the traditional single sealing ring;

[0017] 2. The sealing plug 4 is not fixed in the vacuum pipe 3 by threads, so when vacuum loss or internal leakage occurs, the sealing plug 4 can be ejected by overcoming the elastic force of the compression spring to release the gas, thus avoiding the need to open explosion-proof ports at other locations, which not only reduces the number of leakage points and the leakage rate, but also reduces the cost;

[0018] 3. The protective cap 7 is fixed on the vacuum pipe 3 by thread, which can effectively prevent the sealing plug 4 from ejecting when leakage occurs. A number of discharge holes 9 are opened on the protective cap 7 to discharge the pressure in the vacuum interlayer to the atmosphere;

[0019] 4. The compression spring can well rebound and reset the sealing plug 4, and can also control the size of the vacuum interlayer bursting pressure by changing the elastic coefficient of the compression spring, while avoiding external air contamination of the vacuum interlayer after the pressure release is completed, and can also effectively protect the medium loss of pipelines and containers.

Claims

1. A vacuum joint structure with explosion reset function, including: The vacuum pipe and sealing plug welded on the outer cylinder and connected with the vacuum interlayer are characterized in that: a step is provided in the vacuum pipe, the sealing plug is inserted into the vacuum pipe from top to bottom and abuts against the step, a sealing ring is provided between the sealing plug and the vacuum pipe for sealing, a protective cap is threadedly connected to the top of the vacuum pipe, a compression spring is provided between the protective cap and the sealing plug, one end of the compression spring abuts against the protective cap, and the other end of the compression spring abuts against the sealing plug, and after the protective cap is screwed in, the sealing plug can be elastically pressed by the compression spring, and a discharge hole is provided on the side wall of the protective cap.

2. The vacuum joint structure with explosion reset function according to claim 1, characterized in that: Three sealing rings are arranged between the sealing plug and the vacuum connection pipe.

3. The vacuum joint structure with explosion reset function according to claim 1 or 2, characterized in that: The sealing ring at the bottom between the sealing plug and the vacuum pipe is pressed against the step by the sealing plug.

4. The vacuum joint structure with explosion-reset function according to claim 1, characterized in that: A drain hole is also provided on the top of the protective cap.

5. The vacuum joint structure with explosion reset function according to claim 1, characterized in that: The sealing ring is an O-ring.

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