阅读说明：本技术 一种稳压安全阀及基于该安全阀的气体流路控制方法 (Pressure-stabilizing safety valve and gas flow path control method based on safety valve ) 是由 陈嗣俊 杨蒙达 周小靖 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种稳压安全阀及基于该安全阀的气体流路控制方法,该稳压安全阀包括壳体,所述壳体的一端设有进气口,另一端设有出气口；所述壳体内设有活塞,所述活塞两端的侧壁均与相应位置的壳体内壁相贴合,所述活塞上套接有复位弹簧；所述壳体内的所述进气口与活塞之间形成有进气缓冲腔,所述壳体内的所述出气口与活塞之间形成有出气缓冲腔,所述进气缓冲腔与出气缓冲腔通过导气管相连通,解决了因气压过大而可能引起的安全隐患。(The invention discloses a pressure-stabilizing safety valve and a gas flow path control method based on the pressure-stabilizing safety valve, wherein the pressure-stabilizing safety valve comprises a shell, one end of the shell is provided with a gas inlet, and the other end of the shell is provided with a gas outlet; a piston is arranged in the shell, the side walls at two ends of the piston are both attached to the inner wall of the shell at corresponding positions, and a return spring is sleeved on the piston; an air inlet buffer cavity is formed between the air inlet and the piston in the shell, an air outlet buffer cavity is formed between the air outlet and the piston in the shell, and the air inlet buffer cavity is communicated with the air outlet buffer cavity through an air duct, so that potential safety hazards caused by overlarge air pressure are avoided.)

1. A pressure-stabilizing safety valve is characterized in that: the air conditioner comprises a shell (2), wherein one end of the shell (2) is provided with an air inlet (6), and the other end of the shell is provided with an air outlet (1); a piston (4) is arranged in the shell (2), the side walls of two ends of the piston (4) are attached to the inner wall of the shell (2) at corresponding positions, and a return spring (3) is sleeved on the piston (4); an air inlet buffer cavity (8) is formed between the air inlet (6) and the piston (4) in the shell (2), an air outlet buffer cavity (9) is formed between the air outlet (1) and the piston (4) in the shell (2), and the air inlet buffer cavity (8) is communicated with the air outlet buffer cavity (9) through an air duct (7).

2. The pressure-stabilizing safety valve according to claim 1, characterized in that: piston (4) are close to the cover is equipped with first sealing ring (10) on the lateral wall of air inlet (6) one end, piston (4) are close to the cover is equipped with second sealing ring (11) on the lateral wall of gas outlet (1) one end, piston (4) are close to the top of gas outlet (1) one end is fixed with sealing plug (12).

3. The pressure-stabilizing safety valve according to claim 1, characterized in that: casing (2) are including having seted up first half shell (21) of gas outlet (1) and having seted up second half shell (22) of gas inlet (6), first half shell (21) with second half shell (22) swing joint.

4. The pressure-stabilizing safety valve according to claim 1, characterized in that: the piston (4) is close to the top end on one side of the air inlet (6) and is abutted against the air inlet buffer cavity (8) far away from the inner wall of the shell (2) on one side of the air inlet (6).

5. The pressure-stabilizing safety valve according to claim 1, characterized in that: the cross-section of piston (4) is the T type, reset spring (3) are close to one side conflict of gas outlet (1) is in on casing (2), reset spring (3) are close to one side of air inlet (6), conflict piston (4) head or fix on piston (4) wall.

6. The pressure-stabilizing safety valve according to claim 1, characterized in that: the air duct (7) is arranged outside the shell (1).

7. The gas purification apparatus based on the pressure-stabilizing safety valve according to any one of claims 1 to 6, characterized in that: the device comprises a control unit (31) for controlling the on-off of a gas flow path and a purification unit (32) for purifying gas, wherein the pressure stabilizing safety valve, the control unit (31) and the purification unit (32) are sequentially connected through a pipeline.

8. The gas flow path control method based on the pressure-stabilizing safety valve according to any one of claims 1 to 6, characterized in that:

gas is introduced into the gas inlet buffer cavity (8) through the gas inlet (6), the piston (4) is pushed by the pressure of the gas, when the pressure is higher, the piston (4) is pushed to extrude the return spring (3) to move towards the gas outlet (1) so as to rapidly plug the gas outlet (1) and/or the gas guide pipe (7) by the other end of the piston (4), the gas flow is stopped flowing out from the gas outlet (1) to realize the automatic cut-off of a gas flow path, and the overpressure operation of subsequent equipment is avoided; after the gas pressure is reduced, the return spring (3) pushes the piston (4) to return, the gas outlet (1) and/or the gas guide tube (7) are/is opened, and the gas is discharged from the gas outlet (1).

9. The gas flow path control method according to claim 8, characterized in that: the pressure monitoring device is characterized in that a pressure monitoring module (34) formed by a pressure sensor is arranged at the air inlet (6), a mechanical arm is arranged at one end, close to the air inlet (6), of the piston (4), the pressure monitoring module (34) sends pressure information acquired in real time to the control unit (31), the control unit (31) obtains the difference value between the pressure information of the next time and the pressure information of the previous time, if the difference value exceeds a preset value, the control unit (31) sends a signal to the abnormity judgment module (33), an early warning signal is sent out by the early warning module (35) after judgment, meanwhile, an execution command is sent out to the mechanical arm by the action processing module (36), the piston (4) and/or the reset spring (3) are pushed to plug the air outlet (1) and/or the air guide tube (7), and meanwhile, and air conveying to the air inlet (6) is stopped according to the early warning signal.

Technical Field

The invention relates to the technical field of gas purification, in particular to a pressure-stabilizing safety valve and a gas flow path control method based on the pressure-stabilizing safety valve.

Background

The gas purification device is H in a laboratory₂、N₂And a small-sized purifying device for purifying gas such as airImpurities such as moisture, oxygen and hydrocarbons in the carrier gas and the detector gas are effectively removed. The method can be widely applied to gas purification in laboratories and process flows of polymer materials, organic synthesis, physical chemistry, element analysis, optical fiber materials, semiconductor materials, inorganic materials, metal smelting, environmental analysis, food analysis, gas chromatography and the like. The importance of the gas purification device in the front end of chromatography is self-evident. The gas purification devices available on the market are constructed essentially only in two parts, namely a control unit and a purification unit.

Generally, a gas supply unit connected to a gas purification device performs a certain pressure reduction process, and the maximum gas supply pressure indicated by a gas purification device currently on the market is required to be 2MPa or less. However, when some factors such as misoperation or performance degradation of the pressure reduction module of the gas supply unit occur, the pressure of the gas supply unit may be too high, which may bring a certain safety risk to the gas purification device at the rear end, and in severe cases, physical explosion may be caused by overpressure.

In a word, the current gas purification device serving as a small gas pressure container has serious and insufficient risk avoiding capacity, has certain safety risk, and can be safely used only after the gas supply pressure is ensured. Therefore, it is urgently needed to develop a small-sized gas pressure stabilizing device to ensure the safe operation of the gas purifying device.

Summary of the invention

In order to solve the problems in the background art, the invention provides a pressure-stabilizing safety valve and a gas flow path control method based on the pressure-stabilizing safety valve.

In order to achieve the purpose, the invention provides the following technical scheme: a pressure-stabilizing safety valve comprises a shell, wherein one end of the shell is provided with an air inlet, and the other end of the shell is provided with an air outlet; a piston is arranged in the shell, the side walls at two ends of the piston are respectively attached to the inner wall of the shell at the corresponding position, and a return spring is sleeved on the piston; an air inlet buffer cavity is formed between the air inlet and the piston in the shell, an air outlet buffer cavity is formed between the air outlet and the piston in the shell, and the air inlet buffer cavity is communicated with the air outlet buffer cavity through an air duct.

Preferably, a first sealing ring is sleeved on the side wall of one end, close to the air inlet, of the piston, a second sealing ring is sleeved on the side wall of one end, close to the air outlet, of the piston, and a sealing plug is fixed to the top of one end, close to the air outlet, of the piston.

Preferably, the housing comprises a first half shell provided with the air outlet and a second half shell provided with the air inlet, and the first half shell is movably connected with the second half shell.

Preferably, the top end of the piston on the side close to the air inlet abuts against the inner wall of the shell on the side of the air inlet buffer cavity far away from the air inlet.

Preferably, the cross-section of piston is the T type, reset spring is close to one side of gas outlet is contradicted on the casing, reset spring is close to one side of air inlet, contradicts in the piston head or fix on the piston wall.

Preferably, the air duct is disposed outside the housing.

The invention also provides a gas purification device of the pressure stabilizing safety valve, which comprises a control unit for controlling the on-off of the gas flow path and a purification unit for purifying gas, wherein the pressure stabilizing safety valve, the control unit and the purification unit are sequentially connected through a pipeline.

The invention also provides a gas flow path control method based on the pressure-stabilizing safety valve, wherein gas is introduced into the gas inlet buffer cavity through the gas inlet, the piston is pushed by the pressure of the gas, when the pressure is higher, the piston is pushed to extrude the return spring to move towards the gas outlet, so that the other end of the piston rapidly seals the gas outlet and/or the gas guide tube, the gas flow is stopped flowing out from the gas outlet, the gas flow path is automatically cut off, and the overpressure operation of subsequent equipment is avoided; after the gas pressure is reduced, the return spring pushes the piston to return, the gas outlet and/or the gas guide pipe are opened, and the gas is discharged from the gas outlet.

Preferably, a pressure monitoring module formed by a pressure sensor is arranged at the air inlet, a mechanical arm is arranged at one end, close to the air inlet, of the piston, the pressure monitoring module sends pressure information acquired in real time to the control unit, the control unit obtains the difference value between the pressure information of the next time and the pressure information of the previous time, if the difference value exceeds a preset value, the control unit sends a signal to the abnormity judgment module, an early warning signal is sent out by the early warning module after judgment, an execution command is sent out to the mechanical arm by the action processing module, the piston and/or a reset spring are pushed to plug the air outlet and/or the air guide tube, and meanwhile, air is stopped being conveyed to the air inlet according to the early warning signal.

The invention has the beneficial effects that: this relief valve passes through the linkage cooperation of piston and reset spring in the casing, when the buffer chamber internal gas superpressure of admitting air, under the promotion of strong pressure, the piston moves towards gas outlet one side, and then blocks up the gas outlet, avoids the operation of sequent equipment superpressure, plays the safety protection effect, and after the pressure of admitting air resumes normally, reset spring drove the piston and resets, and the air inlet communicates once more with the gas outlet through the air duct, resumes to ventilate. The safety valve is simple in design structure, safety risks caused by overlarge air supply pressure can be solved, safety of the purifier in the using process is improved, and risks of overpressure explosion are avoided. The air duct of the safety valve is arranged outside the shell of the safety valve, so that the safety valve is convenient to dredge or replace even if the air is blocked due to water or oil contained in the air. In addition, the safety valve has wide application range, is suitable for controlling the pressure of gas, and can also control the pressure of other fluids such as liquid. The gas purification device is combined with the pressure stabilizing safety valve, so that potential safety hazards caused by overlarge air pressure are avoided.

Drawings

Fig. 1 is a schematic sectional view of a safety valve.

Fig. 2 is a block diagram of a gas flow path control structure of the gas purification apparatus.

Wherein: 1-an air outlet, 2-a shell, 21-a first half shell, 22-a second half shell, 3-a reset spring, 4-a piston, 5-a nut, 6-an air inlet, 7-an air duct, 8-an air inlet buffer cavity, 9-an air outlet buffer cavity, 10-a first sealing ring, 11-a second sealing ring, 12-a sealing plug, 31-a control unit, 32-a purification unit, 33-an abnormity judgment module, 34-a pressure monitoring module, 35-an early warning module and 36-an action processing module.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

A pressure-stabilizing safety valve, as shown in figure 1, comprises a shell 2, one end of the shell 2 is provided with an air inlet 6, the other end is provided with an air outlet 1, one end of the air inlet 6 can be communicated with air supply equipment, and then air is introduced into the safety valve; the piston 4 is arranged in the shell 2, the side walls at two ends of the piston 4 are attached to the inner wall of the shell 2 at corresponding positions, so that air leakage in the air inlet buffer cavity 8 and the air outlet buffer cavity 9 is avoided, the piston 4 is sleeved with the reset spring 3 which can provide thrust for resetting of the piston 4, and the piston 4 is ensured to be restored to the original position shown in the figure 1 after air pressure is restored to be normal, wherein the reset spring is in a compression state or a free extension state when normal pressure ventilation is carried out; an air inlet buffer cavity 8 is formed between the air inlet 6 in the shell 2 and the piston 4, an air outlet buffer cavity 9 is formed between the air outlet 1 in the shell 2 and the piston 4, the air inlet buffer cavity 8 is communicated with the air outlet buffer cavity 9 through an air duct 7, and the volume of the air inlet buffer cavity 8 is larger than that of the air outlet buffer cavity 9.

Gas from the gas supply equipment is introduced into the gas inlet buffer cavity 8 through the gas inlet 6 of the safety valve, and when the pressure of the introduced gas is normal (no overpressure), the gas enters the gas outlet buffer cavity 9 through the gas guide pipe 7 and is then discharged into equipment of the next working procedure from the gas outlet 1; when the introduced gas has overpressure, the piston 4 is pushed to move towards one side of the gas outlet 1 under the action of the gas pressure in the gas inlet buffer cavity 8, so that the other end of the piston 4 blocks the gas outlet 1, the gas outlet 1 is stopped to give out gas, and after the gas inlet pressure of the gas inlet 6 returns to normal, the return spring 3 pushes the piston 4 to return under the action of elastic force, so that the safety valve returns smoothly. The safety valve can stabilize the air pressure of the introduced gas, and can automatically cut off a gas flow path when the gas pressure is overlarge so as to protect subsequent equipment.

In some embodiments, a first sealing ring 10 is sleeved on the side wall of the piston 4 near one end of the air inlet 6; the side wall of the piston 4 close to one end of the air outlet 1 is sleeved with a second sealing ring 11. With this arrangement, the sealing performance of the piston 4 can be further improved, and the gas in the gas inlet buffer chamber 8 and the gas outlet buffer chamber 9 is prevented from flowing out through the gap between the piston 4 and the inner wall of the housing 2.

In some embodiments, a sealing plug 12 is fixed on the top of the piston 4 near one end of the air outlet 1, the shape of the sealing plug 12 is matched with the shape of the opening (including the air outlet buffer cavity 9) at the air outlet 1, so as to seal the air outlet 1, and both the sealing plug 12 and the sealing ring can be made of rubber.

In some embodiments, the housing 2 includes a first half-shell 21 having the air outlet 1 and a second half-shell 22 having the air inlet 6, and the first half-shell 21 and the second half-shell 22 are detachably assembled together. Further, as shown in fig. 1, the first half shell 21 and the second half shell 22 are integrally spliced by the nut 5, and the second half shell 22 is inserted into the first half shell 21 and is tightly connected by the nut 5. The shell 2 is designed into two parts which can be spliced, so that the piston 4 and the reset spring 3 can be conveniently placed into the shell 2, and the safety valve can be conveniently disassembled, assembled and maintained.

In some embodiments, the connection portion of the first half-shell 21 and the second half-shell 22 is provided with an internal thread and an external thread which are matched with each other, and the first half-shell 21 and the second half-shell 22 are screwed together (not shown in the figure).

In some embodiments, the top end of the piston 4 on the side close to the air inlet 6 abuts against the inner wall of the housing 2 on the side of the air inlet buffer chamber 8 far from the air inlet 6, so that the piston 4 can be prevented from encroaching on the space of the air inlet buffer chamber 8 under the thrust of the return spring 3.

In some embodiments, piston 4's cross-section is the T type, and reset spring 3 is contradicted on casing 2 near one side of gas outlet 1, and reset spring 3 is close to one side of air inlet 6, contradicts at 4 heads of piston or fixes on 4 walls of piston, through these two kinds of assembly structure, can both make reset spring 3 play the promotion reset action to piston 4, when guaranteeing that pressure of ventilating is normal, the smooth work of relief valve.

A gas purification device, as shown in fig. 1 and 2, comprises the pressure-stabilizing safety valve, wherein the safety valve is used for monitoring the gas pressure at a gas supply end and directly cutting off a gas flow path when the gas pressure is too high; the invention also relates to a protection system used in the technical field of gas purification, which comprises a pressure monitoring module 34, a safety valve, a control unit 31 and a purification unit 32, wherein the pressure-stabilizing safety valve, the control unit 31 and the purification unit 32 are sequentially connected through a pipeline; the control unit 31 may be a switch valve for controlling the on/off of the gas flow path, and the purification unit 32 may be a gas purifier filled with fillers such as activated carbon and molecular sieve. The control unit 31 includes an abnormality determination module 33, an early warning module 35, and an action processing module 36. Pressure monitoring module 34 real time monitoring pipeline pressure, when pressure exceeded the threshold value, unusual judgement module 33 gave abnormal signal, and early warning module 35 gives obvious alarm information through pilot lamp and speaker, and action processing module 36 carries out the action of cutting off the gas circuit simultaneously, and the relief valve can promote piston 4 to block the gas circuit because the atmospheric pressure is too big reason, and the purification unit of protection rear end can not cause the potential safety hazard because of the excessive pressure. In addition, when the pressure monitoring module 34 monitors that the pressure fluctuation of the pipeline is obvious, the abnormity judging module 33 gives out an abnormity signal, the early warning module 35 gives out obvious warning information, and meanwhile, the action processing module 36 executes the action of cutting off the gas circuit, so that the normal use of the rear-end purification unit is ensured.

Specifically, a pressure sensor is arranged at the air inlet 6, a control terminal such as a mechanical arm or an intelligent spring is arranged at one end, close to the air inlet 6, of the piston 4, and the intelligent spring is composed of a main supporting spring, an auxiliary supporting spring, an actuator and a friction disc. The other end of the control terminal is fixedly arranged on the housing 2. The pressure sensor sends the pressure information acquired in real time to the control unit 31, the control unit 31 obtains a difference value between the pressure information of the next time and the pressure information of the previous time, if the pressure information of a single time exceeds a threshold value or the difference value exceeds a preset value, or the change degree of the pressure information changes obviously in unit time (such as continuous monitoring for 10min and 30min), namely although the pressure information does not exceed the preset value, the slope of the numerical change is too high, too low or obviously changed, the pressure information is judged to be abnormal pressure data, at the moment, the control unit 31 gives an early warning signal and an execution signal to the early warning module 35 and the action processing module 36, the execution signal enables the mechanical arm movement or the actuator to drive the intelligent spring to move, so that the piston 4 or the reset spring 3 displaces, and further plugs the air outlet 1 and/or the air duct 7, and meanwhile, the air conveying to the air inlet 6 is stopped according to the early warning signal.

The invention constructs a set of perfect protection system from three aspects of software program control, electronic device combination joint defense and mechanical physical blocking, the protection guarantee mechanism is advanced from simple to complex and layer to layer, multi-layer effective protection is provided, and the instant cut-off of air flow is realized by combining the blocking system which can only give an early warning and prompt through the access of the mechanical safety valve, so that the safety of the purifier in the using process is effectively improved, and the risk of overpressure explosion is avoided.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also fall into the scope of the invention, and the scope of the invention is defined by the claims.