CN213809075U - Ultralow temperature safety discharge device - Google Patents

Abstract

The utility model relates to the technical field of safety valves, in particular to an ultralow temperature safety relief device, which solves the defects existing in the prior art and comprises a lower clamp holder, an upper clamp holder and a valve body, wherein an inverted arch-shaped rupture disc is tightly pressed and fixed between the lower clamp holder and the upper clamp holder, and one side of the inverted arch-shaped rupture disc is provided with a signal wire; one side of the upper clamp holder is connected with a pipeline through a flange plate, the pipeline is communicated with the inside of the clamp holder, the pipeline is respectively provided with a one-way valve and a pressure gauge, the top of the upper clamp holder is fixedly connected with the valve body, a rupture disc is connected in series in front of the spring type safety valve for ultralow temperature gas medium, the ultralow temperature gas medium is isolated by the rupture disc, zero leakage of the safety valve is ensured under the normal operation state of the system, frequent replacement is not needed, the loss of raw materials is saved, and the production efficiency is improved.

Description

Ultralow temperature safety discharge device

Technical Field

The utility model relates to a relief valve technical field especially relates to ultra-low temperature safety relief device.

Background

Liquid oxygen, liquid nitrogen and other media with ultralow temperature reaching-196 ℃ are commonly used in air separation plants and refrigeration cryogenic systems, and due to the extremely low temperature and the pressure in the systems, the systems have great danger in production, storage and transportation, and once the overflow meets the human body, the human body is slightly frostbitten, the human body is seriously dangerous to life, and the correct selection of proper safety accessories for protecting the systems or equipment pipelines is very important. At present, a common pressure relief protection device in China is an ultralow-temperature safety valve, the manufacturing standard of the ultralow-temperature safety valve is GB/T29026-2012 'low-temperature medium spring direct load type safety valve', however, due to the ultralow-temperature factor of a gas medium, cold deformation of materials inside the valve (volume change caused by material phase change) can be caused, after the valve operates for a period of time, a sealing surface is easy to leak due to deformation, the valve is frequently replaced, economic loss is brought to a user manufacturer, and the production efficiency of the ultralow-temperature safety valve is also influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing an ultralow temperature safety relief device.

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

the ultralow-temperature safety relief device comprises a lower holder, an upper holder and a valve body, wherein an inverted arch-shaped rupture disk is tightly pressed and fixed between the lower holder and the upper holder, and a signal wire is arranged on one side of the inverted arch-shaped rupture disk;

one side of going up the holder is connected with the pipeline through the ring flange, and the pipeline is linked together with the inside of holder, and installs respectively on the pipeline has check valve and manometer, go up the top of holder with valve body fixed connection, the export has been seted up to one side of valve body, and the inside fixed of valve body is equipped with the disk seat, the top of disk seat is equipped with the valve clack, there is the bellows through the screw fixation between the inner chamber of valve clack and valve body.

Preferably, the top of valve body is fixed with the valve gap through the bolt, has seted up between valve gap and the valve body and has kept apart the chamber, and the inside slip of valve body is equipped with the valve rod, a pot head of valve rod is established in the inside of bellows, and the outside cover of valve rod is equipped with the spring.

Preferably, a protective cover is fixed to the top of the valve cover through bolts, and one end of the valve rod is located inside the protective cover.

Preferably, one end of the corrugated pipe, which is in contact with the valve clack, is of a closed structure.

Preferably, the material of the anti-arch rupture disk is 304 low-temperature resistant austenitic stainless steel.

The utility model has the advantages that:

1. the rupture disk is connected in series in front of the spring type safety valve for the ultralow-temperature gas medium, the ultralow-temperature gas medium is isolated by the rupture disk, zero leakage of the safety valve is ensured under the normal operation state of the system, frequent replacement is not needed, the loss of raw materials is saved, and the production efficiency is improved.

2. Can not be close to pressure relief device through the signal line and use the scene, can monitor at the control room, more effectual protection personnel safety.

3. When the valve is opened, the valve cover cannot be leaked to the surrounding environment and atmosphere, so that the safety of field personnel and environment is ensured.

Drawings

Fig. 1 is the utility model provides an ultra-low temperature safety relief device's schematic structure.

In the figure: 1 lower holder, 2 anti-arch rupture disk, 3 check valves, 4 upper holders, 5 pressure gauges, 6 valve bodies, 7 valve seats, 8 valve clacks, 9 corrugated pipes, 10 isolation chambers, 11 springs, 12 valve rods, 13 valve covers and 14 protective covers.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, the ultralow temperature safety relief device comprises a lower holder 1, an upper holder 4 and a valve body 6, wherein an inverted arch-shaped rupture disk 2 is tightly pressed and fixed between the lower holder 1 and the upper holder 4, and a signal wire is arranged on one side of the inverted arch-shaped rupture disk 2; go up one side of holder 4 and be connected with the pipeline through the ring flange, the pipeline is linked together with the inside of holder, and installs respectively on the pipeline has check valve 3 and manometer 5, goes up the top and the 6 fixed connection of valve body of holder 4, and the export has been seted up to one side of valve body 6, and the inside fixed mounting of valve body 6 has disk seat 7, and the top of disk seat 7 is equipped with valve clack 8, has bellows 9 through the screw fixation between the inner chamber of valve clack 8 and valve body 6.

The explosion piece is connected in series in front of the spring type safety valve for the ultralow-temperature gas medium, the ultralow-temperature gas medium is isolated by the explosion piece, zero leakage of the safety valve is ensured under the normal operation state of the system, frequent replacement is not needed, loss of raw materials is saved, production efficiency is improved, the signal line can not approach the use site of the pressure relief device, monitoring can be carried out in a control room, safety of personnel is effectively protected, the valve can not be released to the surrounding environment and atmosphere from the valve cover when being opened, and safety of the personnel and the environment on the site is ensured.

Wherein, there is valve gap 13 at the top of valve body 6 through the bolt fastening, keep apart chamber 10 has been seted up between valve gap 13 and the valve body 6, the inside slip of valve body 6 is equipped with valve rod 12, a pot head of valve rod 12 is established in the inside of bellows 9, and the outside cover of valve rod 12 is equipped with spring 11, there is safety cover 14 at the top of valve gap 13 through the bolt fastening, the one end of valve rod 12 is located the inside of safety cover 14, the one end of bellows 9 and the contact of valve clack 8 is enclosed construction, the material of anti-arch rupture disk 2 is 304 low temperature resistant austenitic stainless steel.

In the embodiment, the inverted arch rupture disk 2 adopts an inverted arch belt groove type, so that no fragment is generated after rupture, the set pressure value of the rupture disk is the same as that of a safety valve, the rupture disk is made of 304 low-temperature resistant austenitic stainless steel, the rupture disk can resist a gas medium with the ultralow temperature of-196 ℃, signal lines (ports A and B) are arranged on the rupture disk, and the signal lines can be connected with a signal lamp of a control room of a user factory and then the on-off of the rupture disk can be measured, if the rupture disk is exploded or artificially ruptured, the signal lines can be disconnected, the signal lamp goes out, and the rupture disk is prompted to be damaged and needs to be checked for reasons and replaced; the rupture disk is produced by a manufacturer with a special equipment production license;

the anti-arch rupture disk 2 is fixedly arranged at a flange port prepared by equipment by an upper clamp holder and a lower clamp holder, the upper clamp holder 4 is connected with a pressure gauge 5 and a one-way valve 3 through pipelines, the outlet of the one-way valve 3 is connected with atmosphere to ensure that no back pressure at the upper part of the rupture disk can be correctly exploded according to the set pressure, the pressure gauge can reflect the working state of the rupture disk on site, the value of the pressure gauge is zero, and if the pressure value in the pressure gauge indicates that the rupture disk is ruptured;

furthermore, the internal structure of the safety valve adopts a bellows 9 structure, a spring cavity and a valve cover 13 can be isolated, low-temperature medium cannot enter the isolation cavity 10 and the valve cover 13 if overflowing, and can only be discharged from an outlet of the valve body 6, and an outlet flange is connected with a discharge pipeline to be communicated with a recovery device, so that potential safety hazards to the surrounding space of the valve and the surrounding environment are avoided; because the pressure in the system is lower than the set pressure of the rupture disk and the safety valve when the low-temperature system normally operates, the medium directly acts on the rupture disk and cannot be ruptured, and zero leakage of the medium is ensured; the safety valve part material and the bellows material are all made of austenitic stainless steel through solution treatment in advance, in order to ensure the low temperature resistance of the safety valve part material and the bellows material, the valve body 6, the valve seat 7, the valve clack 8, the bellows 9, the spring 11, the valve rod 12 and the valve cover 13 are all subjected to cryogenic treatment before assembly, the cold deformation resistance of the safety valve part material is improved, the leakage rate is detected to be higher than the national standard (if the standard requires that the leakage rate is less than 12cm3/min per minute, and the internal control standard is less than 6cm3/min) during factory inspection, if a rupture disk is damaged, the safety valve can still normally work as the last line of defense, and the equipment or the system can still normally work.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (5)

1. The ultralow-temperature safety relief device comprises a lower holder (1), an upper holder (4) and a valve body (6), and is characterized in that an inverted arch-shaped rupture disc (2) is compressed and fixed between the lower holder (1) and the upper holder (4), and a signal wire is arranged on one side of the inverted arch-shaped rupture disc (2);

go up one side of holder (4) and be connected with the pipeline through the ring flange, the pipeline is linked together with the inside of holder, and installs respectively on the pipeline have check valve (3) and manometer (5), go up the top of holder (4) with valve body (6) fixed connection, the export has been seted up to one side of valve body (6), and the inside fixed of valve body (6) is equipped with disk seat (7), the top of disk seat (7) is equipped with valve clack (8), there is bellows (9) through the screw fixation between the inner chamber of valve clack (8) and valve body (6).

2. An ultralow temperature safety relief device according to claim 1, wherein a valve cover (13) is fixed on the top of the valve body (6) through bolts, an isolation chamber (10) is opened between the valve cover (13) and the valve body (6), a valve rod (12) is slidably assembled in the valve body (6), a sleeve of the valve rod (12) is arranged in the corrugated pipe (9), and a spring (11) is sleeved outside the valve rod (12).

3. The ultra-low temperature safety vent apparatus according to claim 2, wherein the top of the valve cover (13) is fixed with a protective cover (14) by bolts, and one end of the valve stem (12) is located inside the protective cover (14).

4. The ultralow temperature safety vent apparatus according to claim 1, wherein the end of the bellows (9) in contact with the valve flap (8) is of closed structure.

5. The ultralow temperature safety vent apparatus according to claim 1, wherein the material of the reverse arch-shaped rupture disk (2) is 304 austenitic stainless steel with low temperature resistance.

Images