Nmp inhibiting volatile collection storage device and method

Abstract

The application discloses an NMP inhibiting and volatilizing type collecting and storing device and method, and relates to the technical field of NMP storage. In the application, a dynamic layered liquid storage cavity and a top gas cavity are designed in an NMP liquid tank, NMP liquid in the liquid storage cavity is accessed through an externally connected liquid pipe, and the liquid storage cavity liquid surface prone to volatilization is sealed by pressure by cooperating with an externally connected gas pipe, a gas guide assembly and an auxiliary gas pressure pipe, so that the NMP liquid is better stored. Even if the sealing performance of the top sealing piston is reduced, the high pressure of the gas pressure pipe cavity can directly inhibit the NMP volatiles in the top gas cavity. Meanwhile, the first gas pressure sensor can timely monitor the NMP liquid level floating state pressed by the top sealing piston, timely monitor and early warn the NMP leakage, facilitate the NMP collecting and storing operation, improve the sealing performance of the NMP liquid in the storage process, and avoid the volatilization safety hidden danger in the frequent NMP accessing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of NMP storage, in particular to an NMP volatile inhibition type collection and storage device and method. BACKGROUND

[0002] NMP, generally refers to N-methyl pyrrolidone, chemical formula is C5H9NO, colorless liquid, with ammonia smell, melting point-24 DEG C, boiling point 202 DEG C. Can be mixed with water, soluble in ether, acetone and most organic solvents, can dissolve most of the organic and inorganic compounds, polar gas, natural and synthetic polymer compounds.

[0003] NMP is a kind of excellent high-grade solvent, it is a kind of polar solvent with strong selectivity and good stability, and is often used as a good cleaning agent for high-precision electronics, circuit board and lithium battery.

[0004] However, when NMP liquid is stored, it needs to be stored in dry inert gas, keep the container sealed, and stored in cool and dry place. At the same time, it needs to avoid exposure: before use, special guidance is needed to avoid contact with skin and eyes, avoid inhaling vapour and smoke, and avoid fire.

[0005] As a liquid raw material with strict sealed storage conditions, sometimes when there are many production orders in the workshop, the frequency of NMP storage tank for liquid storage and output is high, the NMP liquid volatilizes more to the outside world when the storage tank is opened frequently, and the harm to the storage and transportation personnel is greater. Moreover, even if the NMP liquid is stored statically, even if the cover is sealed well, the sealing performance may decrease after long-term use. Once the NMP volatilizes too much, the safety of the storage environment will be greatly reduced. SUMMARY

[0006] The technical problem to be solved by the present application is to provide an NMP volatile inhibition type collection and storage device and method, so as to facilitate the collection and storage operation of NMP, improve the sealing performance of NMP liquid in the storage process, and avoid the volatile safety hazard in the process of frequent access of NMP liquid.

[0007] To solve the above technical problems, the present application is realized by the following technical scheme:

[0008] The present application provides an NMP volatile inhibition type collection and storage device, comprising an NMP liquid tank, an auxiliary air pressure pipe connected with the NMP liquid tank, a negative pressure device connected with the auxiliary air pressure pipe, and a booster device connected with the auxiliary air pressure pipe. The NMP liquid tank is provided with a sealed top disc at the top. The NMP liquid tank is provided with a vertically movable top sealing piston, a liquid storage cavity below the top sealing piston, and a top air cavity between the top sealing piston and the sealed top disc. The bottom side of the sealed top disc is provided with a first air pressure sensor for sensing and monitoring the air pressure of the top air cavity.

[0009] The bottom of the storage cavity of the NMP liquid tank is connected with an external liquid pipe, one end of the external liquid pipe is provided with a liquid pipe valve, and the top of the top gas cavity of the NMP liquid tank is connected with an external gas pipe, and the end of the external gas pipe is integrally connected with a gas guide assembly.

[0010] The gas guide assembly is provided with a gas guide cavity, a connecting pipe air inlet opening on one side of the gas guide cavity, and a tapered air inlet opening on the other side of the gas guide cavity, and a tapered plug is arranged at the position of the tapered air inlet opening, wherein a tension spring for elastically supporting the tapered plug is arranged in the gas guide cavity.

[0011] The auxiliary gas pressure pipe is provided with a plurality of independent gas pressure pipe cavities, and the tapered air inlet opening of each gas guide assembly is independently communicated with one gas pressure pipe cavity, wherein a second gas pressure sensor for sensing and detecting the gas pressure of the gas pressure pipe cavity is arranged in each gas pressure pipe cavity.

[0012] The gas pressure pipe cavity is connected with a pressure reducing branch pipe and a pressure increasing branch pipe, and the pressure reducing branch pipe and the pressure increasing branch pipe are independently provided with an electric control valve, and the negative pressure device and the pressure increasing device are independently provided with a plurality of output branches, and the pressure reducing branch pipe is connected with one output branch of the negative pressure device, and the pressure increasing branch pipe is connected with one output branch of the pressure increasing device.

[0013] As a preferred technical scheme of the storage device of the application: the horizontal position of the external liquid pipe outside the port is higher than the maximum liquid storage level in the storage cavity.

[0014] As a preferred technical scheme of the storage device of the application: the gas guide cavity is fixedly provided with a plurality of fixed supporting rods, the plurality of fixed supporting rods are connected with a guide sleeve, a guide rod is movably installed at the position of the guide sleeve, and the tapered plug is installed on the side of the guide rod facing the tapered air inlet opening. Wherein, the tension spring is sleeved on the guide rod, and the tension spring is located between the tapered plug and the guide sleeve.

[0015] As a preferred technical scheme of the storage device of the application: the gas guide assembly is provided with an assembly flange, each gas pressure pipe cavity of the auxiliary gas pressure pipe is provided with a fixed flange, and the assembly flange and the fixed flange are sealingly connected. Wherein, the fixed flange is surrounded by a plurality of limiting protrusions for limiting the movement range of the tapered plug.

[0016] As a preferred technical scheme of the storage device of the application: the gap between adjacent limiting protrusions is greater than the maximum radial dimension of the tapered plug.

[0017] As a preferred technical scheme of the storage device of the application: when the NMP liquid tank is stored, the gas pressure of the gas pressure pipe cavity is greater than the gas pressure of the top gas cavity. When the NMP liquid tank inputs liquid, the gas pressure of the gas pressure pipe cavity is less than the gas pressure of the top gas cavity. When the NMP liquid tank discharges liquid, the gas pressure of the gas pressure pipe cavity is less than the gas pressure of the top gas cavity.

[0018] The application relates to an NMP volatile inhibition type collecting and storing method, which comprises the following steps:

[0019] S1. When NMP liquid is filled into an empty NMP liquid tank, a liquid pipe valve is opened, NMP liquid is injected from an externally connected liquid pipe port, the NMP liquid enters a liquid storage cavity, a top piston is pushed upwards, and the gas pressure in a top gas cavity starts to linearly increase.

[0020] S2. When the sum of the pressure of the top gas cavity acting on the cone plug and the tension of the tension spring is greater than the pressure of the gas pressure pipe cavity acting on the cone plug, the cone plug is separated from the conical vent, and the gas in the top gas cavity enters the gas pressure pipe cavity.

[0021] S3. When the second gas pressure sensor monitors that the gas pressure in the gas pressure pipe cavity reaches a preset first gas pressure value P1 of the system, a negative pressure device is actuated, and an electric control valve of a corresponding pressure reduction branch pipe is opened to start pressure reduction operation on the gas pressure pipe cavity.

[0022] S4. After the NMP liquid tank is filled with liquid, the liquid pipe valve and the electric control valve of the pressure reduction branch pipe are closed.

[0023] S5. The pressurizing device continuously injects inert gas into the gas pressure pipe cavity, the cone plug is sealed at the position of the conical vent under the action of the continuously increasing gas pressure in the gas pressure pipe cavity, and at this time, the second gas pressure sensor senses and monitors the gas pressure in the gas pressure pipe cavity, which is recorded as P X。

[0024] S6. The first gas pressure sensor monitors the gas pressure in the top gas cavity, which is recorded as P Y。

[0025] S7. The pressurizing device continues to pressurize the gas pressure pipe cavity until the gas pressure in the gas pressure pipe cavity reaches P X +△P, and the electric control valve of the pressurizing branch pipe is closed.

[0026] S8. When the NMP liquid tank is stored with NMP liquid, the second gas pressure sensor monitors the gas pressure in the gas pressure pipe cavity: when the gas pressure in the gas pressure pipe cavity decreases, the system outputs an auxiliary gas pressure pipe “gas pressure leakage” alarm; when the gas pressure in the gas pressure pipe cavity does not decrease, the first gas pressure sensor monitors the gas pressure in the top gas cavity in real time, and when the first gas pressure sensor monitors that the gas pressure in the top gas cavity is less than P Y , the system outputs an NMP liquid tank “storage pressure leakage” alarm.

[0027] Compared with the prior art, the application has the beneficial effects that:

[0028] The application can better realize the preservation of NMP liquid by designing a dynamic layered liquid storage cavity and a top gas cavity in the NMP liquid tank, performing tubular access of NMP liquid to the liquid storage cavity through an external liquid pipe, and cooperating with the gas pressure isolation type through the external gas pipe, the gas guide assembly and the auxiliary gas pressure pipe to block the liquid surface of the liquid storage cavity which is prone to volatilization by gas pressure, so as to realize the preservation of NMP liquid; even if the sealing performance of the top sealing piston decreases, the high pressure of the gas pressure pipe cavity can directly inhibit NMP volatiles in the top gas cavity; at the same time, the first gas pressure sensor can timely monitor the NMP liquid level floating state pressed by the top sealing piston, and timely monitor and warn NMP leakage, so as to facilitate the collection and storage operation of NMP, improve the sealing performance of NMP liquid in the storage process, and avoid the volatile safety hazard in the frequent access process of NMP liquid. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the NMP collection and storage device in the application.

[0030] Figure 2 It is a schematic diagram of the overall structure of the NMP collection and storage device in the application. Figure 1 It is a schematic diagram of the overall structure of the NMP collection and storage device in the application.

[0031] Figure 3 It is a schematic diagram of the overall structure of the NMP collection and storage device in the application.

[0032] Figure 4 It is a schematic diagram of the overall structure of the NMP collection and storage device in the application.

[0033] 1-NMP liquid tank, 101-liquid storage cavity, 102-top sealing piston, 103-sealing top disc, 104-top gas cavity, 105-first gas pressure sensor, 106-external liquid pipe, 107-liquid pipe valve, 108-external gas pipe, 109-gas guide assembly, 1091-gas guide cavity, 1092-fixed branch, 1093-guide sleeve, 1094-pipe vent, 1095-cone vent, 1096-guide rod, 1097-cone plug, 1098-tension spring, 1099-assembly flange; 2-auxiliary gas pressure pipe, 201-gas pressure pipe cavity, 202-fixed flange, 203-limiting protrusion, 204-second gas pressure sensor, 205-decompression branch pipe, 206-pressurization branch pipe, 207-electric control valve; 3-negative pressure device; 4-pressurization device. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and not to limit the application.

[0035] Embodiment one, the present application relates to a kind of NMP inhibits volatile type collection storage device, its main structural features are as follows:

[0036] Please refer to Figure 1 Auxiliary air pipe 2 is connected with NMP liquid tank 1, negative pressure device 3 is connected with auxiliary air pipe 2, and negative pressure device 3 is used to reduce the air pressure in auxiliary air pipe 2. Booster device 4 is connected with auxiliary air pipe 2, and booster device 4 is used to increase the air pressure in auxiliary air pipe 2. Sealing top disc 103 is installed at the top of NMP liquid tank 1, and sealing top piston 102 is vertically moved in NMP liquid tank 1, and storage cavity 101 is below sealing top piston 102, and top gas cavity 104 is between sealing top piston 102 and sealing top disc 103. First air pressure sensor 105 is installed on the bottom side of sealing top disc 103, and first air pressure sensor 105 is used to sense and monitor the air pressure of top gas cavity 104.

[0037] External liquid pipe 106 is connected at the bottom of storage cavity 101 of NMP liquid tank 1, and liquid pipe valve 107 is located at the outer side end of external liquid pipe 106. The horizontal position of the outer side port of external liquid pipe 106 is higher than the maximum storage liquid level in storage cavity 101, is affected by the air pressure of top gas cavity 104, sealing top piston 102 acts downward, the liquid level in storage cavity 101 is "pressed down" and reduced, and the liquid level of the output port of external liquid pipe 106 is higher than the liquid level of storage cavity 101, to prevent residual gas in the upper end pipeline of external liquid pipe 106.

[0038] Auxiliary air pipe 2 is provided with a plurality of independent air pipe cavities 201, and the conical air vent 1095 of each air guide assembly 109 is independently communicated with an air pipe cavity 201. Each air pipe cavity 201 is provided with a second air pressure sensor 204, and the second air pressure sensor 204 is used to sense and detect the air pressure of air pipe cavity 201.

[0039] The air pipe cavity 201 is externally connected with a pressure reducing branch pipe 205 and a pressure increasing branch pipe 206, and the pressure reducing branch pipe 205 and the pressure increasing branch pipe 206 are independently provided with an electric control valve 207.

[0040] The negative pressure device 3 and the booster device 4 are independently provided with a plurality of output branches, the pressure reducing branch pipe 205 is connected with an output branch of the negative pressure device 3, and the pressure increasing branch pipe 206 is connected with an output branch of the booster device 4. In the present application, a plurality of NMP liquid tanks 1 are placed in the warehouse, the auxiliary air pipe 2 is provided with a plurality of air pipe cavities 201, the external air pipe 108 of each NMP liquid tank 1 is independently connected with an air pipe cavity 201, and an output branch of the negative pressure device 3 and an output branch of the booster device 4 are connected with an air pipe cavity 201.

[0041] When the NMP liquid tank 1 is in static storage, the gas pressure in the gas pressure cavity 201 is greater than the gas pressure in the top gas cavity 104. When the NMP liquid tank 1 is inputting liquid, the gas pressure in the gas pressure cavity 201 is less than the gas pressure in the top gas cavity 104. When the NMP liquid tank 1 is discharging liquid, the gas pressure in the gas pressure cavity 201 is less than the gas pressure in the top gas cavity 104.

[0042] Please refer to Figure 1 、 Figure 2 , the outer connecting gas pipe 108 is connected to the top area of the top gas cavity 104 of the NMP liquid tank 1, and the gas guide assembly 109 is connected to the end of the outer connecting gas pipe 108, and the gas guide assembly 109 and the outer connecting gas pipe 108 can be an integral structure.

[0043] Please refer to Figure 2 , the gas guide assembly 109 is provided with a gas guide cavity 1091, one side of the gas guide cavity 1091 is provided with a connecting pipe air outlet 1094, the other side of the gas guide cavity 1091 is provided with a tapered air outlet 1095, the tapered air outlet 1095 is provided with a tapered plug 1097 at the position, a plurality of fixed support rods 1092 are fixedly arranged in the gas guide cavity 1091, and the plurality of fixed support rods 1092 are connected to a guide sleeve 1093, a guide rod 1096 is movably arranged at the position of the guide sleeve 1093, and the tapered plug 1097 is arranged on the side of the guide rod 1096 facing the tapered air outlet 1095. A tension spring 1098 is sleeved on the guide rod 1096, and the tension spring 1098 is located between the tapered plug 1097 and the guide sleeve 1093.

[0044] The gas guide assembly 109 is provided with an assembly flange 1099, each gas pressure cavity 201 of the auxiliary gas pressure pipe 2 is provided with a fixed flange 202, and the assembly flange 1099 and the fixed flange 202 are in sealing and matched connection. A plurality of limiting protrusions 203 are arranged in the fixed flange 202, and the plurality of limiting protrusions 203 can limit the moving range of the tapered plug 1097.

[0045] Please refer to Figure 1 、 Figure 3 、 Figure 4 , the gap between the adjacent limiting protrusions 203 is greater than the maximum radial dimension of the tapered plug 1097, and the diameter dimension of the gap between the adjacent limiting protrusions 203 is the inner diameter of the fixed flange 202, and in combination with Figure 3 , it can also be seen that the limiting protrusion 203 limits the upward movement of the tapered plug 1097, and the gap enables the gas flow around the tapered plug 1097 to pass through the gap and flow into the gas pressure cavity 201 in the upward direction, and vice versa.

[0046] Embodiment two, the application relates to an access method for inhibiting excessive volatilization during NMP access, and the specific content is as follows:

[0047] First, when the NMP liquid tank 1 is filled with NMP liquid, the liquid pipe valve 107 is opened, and NMP liquid is injected from the port of the externally connected liquid pipe 106. The NMP liquid enters the liquid storage cavity 101, and the top piston 102 is pushed upward, and the gas pressure in the top gas cavity 104 begins to increase linearly.

[0048] When the sum of the pressure of the top gas cavity 104 acting on the conical plug 1097 and the tension of the tension spring 1098 is greater than the pressure of the gas pressure cavity 201 acting on the conical plug 1097, the conical plug 1097 is separated from the conical vent 1095, and the gas in the top gas cavity 104 enters the gas pressure cavity 201.

[0049] Then, when the second gas pressure sensor 204 monitors that the gas pressure in the gas pressure cavity 201 reaches the first gas pressure value P1 preset by the system, the negative pressure device 3 acts and opens the electric control valve 207 corresponding to the pressure reduction branch pipe 205 to start the pressure reduction operation on the gas pressure cavity 201. The first gas pressure value is a reference value for the negative pressure device 3 to act when the gas pressure in the gas pressure cavity 201 is higher than the standard atmospheric pressure by a certain value. Because the gas pressures in the top gas cavity 104 and the gas pressure cavity 201 are higher than the standard atmospheric pressure during subsequent static storage, if the sealing effect of the liquid pipe valve 107 decreases, external gas is easy to enter the externally connected liquid pipe 106, affecting the safety and quality of liquid storage. At the same time, the high gas pressure state of the top gas cavity 104 can press the contact between the top piston 102 and the NMP liquid, avoiding the existence of gas gap in the contact surface.

[0050] Then, when the NMP liquid tank 1 is filled with NMP liquid, the liquid pipe valve 107, the electric control valve 207 of the pressure reduction branch pipe 205 is closed. The NMP liquid tank 1 at other positions is still being filled, and the negative pressure device 3 continues to perform pressure reduction operation through other output branches. When all the NMP liquid tanks 1 are filled, the negative pressure device 3 stops acting.

[0051] Then, the pressure increasing device 4 continuously injects inert gas into the gas pressure cavity 201, and the conical plug 1097 is blocked at the position of the conical vent 1095 under the action of the continuously increasing gas pressure in the gas pressure cavity 201. At this time, the second gas pressure sensor 204 senses and monitors the gas pressure in the gas pressure cavity 201, which is denoted as P X。 The first gas pressure sensor 105 monitors the gas pressure in the top gas cavity 104, which is denoted as P Y。

[0052] The pressure increasing device 4 continues to increase the pressure in the gas pressure cavity 201 until the gas pressure in the gas pressure cavity 201 reaches P X+△P, the electrically controlled valve 207 of the pressure boosting branch pipe 206 is closed. Wherein, △P is a preset pressure increment value of the system, generally 0.1-0.3 atm. After the NMP liquid tank 1 and the pressure lumen 201 at other positions complete the corresponding pressure boosting actions, the pressure boosting device 4 stops the action.

[0053] Finally, when the NMP liquid tank 1 is at rest to store NMP liquid, the second pressure sensor 204 monitors the pressure of the pressure lumen 201:

[0054] Case one: when the pressure of the pressure lumen 201 decreases, the system outputs the "pressure leakage" alarm of the auxiliary pressure pipe 2.

[0055] Case two: when the pressure of the pressure lumen 201 does not decrease, the first pressure sensor 105 monitors the pressure of the top air cavity 104 in real time, and when the first pressure sensor 105 monitors that the pressure of the top air cavity 104 is less than P Y , the system outputs the "storage pressure leakage" alarm of the NMP liquid tank 1.

[0056] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A NMP volatile inhibition type collection and storage device, characterized in that: it comprises an NMP liquid tank (1), an auxiliary air pressure pipe (2) connected with the NMP liquid tank (1), a negative pressure device (3) connected with the auxiliary air pressure pipe (2), and a pressure boosting device (4) connected with the auxiliary air pressure pipe (2), the NMP liquid tank (1) is provided with a sealed top disc (103) at the top, a vertically movable top sealing piston (102) is arranged in the NMP liquid tank (1), a liquid storage cavity (101) is arranged below the top sealing piston (102), and a top gas cavity (104) is arranged between the top sealing piston (102) and the sealed top disc (103), wherein the bottom side of the sealed top disc (103) is provided with a first air pressure sensor (105) for sensing and monitoring the air pressure of the top gas cavity (104); the bottom of the liquid storage cavity (101) of the NMP liquid tank (1) is connected with an external liquid pipe (106), one end of the external liquid pipe (106) is provided with a liquid pipe valve (107); the top of the top gas cavity (104) of the NMP liquid tank (1) is connected with an external gas pipe (108), and the end of the external gas pipe (108) is integrally connected with a gas guide assembly (109); the gas guide assembly (109) is provided with a gas guide cavity (1091), a connecting pipe air vent (1094) opening on one side of the gas guide cavity (1091), and a tapered air vent (1095) opening on the other side of the gas guide cavity (1091), the tapered air vent (1095) is provided with a tapered plug (1097) at the position, and a tension spring (1098) for elastically supporting the tapered plug (1097) is arranged in the gas guide cavity (1091); the auxiliary air pressure pipe (2) is provided with a plurality of independent air pressure pipe cavities (201), and the tapered air vent (1095) of each gas guide assembly (109) is independently communicated with one air pressure pipe cavity (201); wherein each air pressure pipe cavity (201) is provided with a second air pressure sensor (204) for sensing and detecting the air pressure of the air pressure pipe cavity (201); the air pressure pipe cavity (201) is connected with a pressure reducing branch pipe (205) and a pressure boosting branch pipe (206) outside, and the pressure reducing branch pipe (205) and the pressure boosting branch pipe (206) are independently provided with an electric control valve (207); the negative pressure device (3) and the pressure boosting device (4) are independently provided with a plurality of output branches, the pressure reducing branch pipe (205) is connected with one output branch of the negative pressure device (3), and the pressure boosting branch pipe (206) is connected with one output branch of the pressure boosting device (4).

2. The NMP volatile inhibition type collection and storage device according to claim 1, characterized in that: the outer side port of the external liquid pipe (106) is horizontally arranged higher than the maximum liquid storage level in the liquid storage cavity (101).

3. The NMP volatile inhibition type collection and storage device according to claim 1, characterized in that: ​ ​ The air guide cavity (1091) is fixedly provided with a plurality of fixed support rods (1092), and the plurality of fixed support rods (1092) are connected with a guide sleeve (1093) in common, the guide sleeve (1093) is movably installed at a position, and a guide rod (1096) is installed at the position; and the tapered plug (1097) is installed at a side of the guide rod (1096) facing the tapered vent (1095). The tension spring (1098) is sleeved on the guide rod (1096), and the tension spring (1098) is located between the tapered plug (1097) and the guide sleeve (1093).

4. The NMP volatile inhibition type collection and storage device according to claim 1, wherein: the air guide assembly (109) is provided with an assembly flange (1099), each gas pressure pipe cavity (201) of the auxiliary gas pressure pipe (2) is provided with a fixed flange (202), and the assembly flange (1099) is in sealing fit connection with the fixed flange (202). The fixed flange (202) is provided with a plurality of limiting protrusions (203) for limiting the movement range of the tapered plug (1097) in the inner periphery.

5. The NMP volatile inhibition type collection and storage device according to claim 4, wherein: a gap with a radial size greater than the maximum radial size of the tapered plug (1097) is left between adjacent limiting protrusions (203).

6. The NMP volatile inhibition type collection and storage device according to claim 1, wherein: when the NMP liquid tank (1) is in static storage, the gas pressure in the gas pressure pipe cavity (201) is greater than the gas pressure in the top gas cavity (104); when the NMP liquid tank (1) inputs liquid, the gas pressure in the gas pressure pipe cavity (201) is less than the gas pressure in the top gas cavity (104); and when the NMP liquid tank (1) discharges liquid, the gas pressure in the gas pressure pipe cavity (201) is less than the gas pressure in the top gas cavity (104). The NMP volatile inhibition type collection and storage device according to any one of claims 1 to 6, comprising the following steps: S1. When NMP liquid is filled into the empty NMP liquid tank (1), the liquid pipe valve (107) is opened, the NMP liquid is injected from the port of the externally connected liquid pipe (106), the NMP liquid enters the liquid storage cavity (101), the sealing piston (102) is pushed upward, and the gas pressure in the top gas cavity (104) starts to linearly increase; S2. When the sum of the pressure of the gas in the top gas cavity (104) acting on the tapered plug (1097) and the tension of the tension spring (1098) is greater than the pressure of the gas in the gas pressure pipe cavity (201) acting on the tapered plug (1097), the tapered plug (1097) is separated from the tapered vent (1095), and the gas in the top gas cavity (104) enters the gas pressure pipe cavity (201); S3. When the second gas pressure sensor (204) detects that the gas pressure in the gas pressure pipe cavity (201) reaches a first gas pressure value P1 preset by the system, the negative pressure device (3) acts and opens the electric control valve (207) of the corresponding pressure reduction branch pipe (205) to start the pressure reduction operation on the gas pressure pipe cavity (201). ​ 7. An NMP volatile inhibition type collection and storage method characterized by comprising: ​ ​ ​ ​ S4. After the NMP liquid tank (1) is filled, the liquid pipe valve (107) and the electric control valve (207) of the pressure reducing branch pipe (205) are closed; S5. The pressurizing device (4) continuously injects inert gas into the air pressure lumen (201), the tapered plug (1097) is continuously subjected to the increasing air pressure of the air pressure lumen (201), the tapered plug (1097) is blocked at the position of the tapered vent (1095), at this time, the second air pressure sensor (204) senses and monitors the air pressure of the air pressure lumen (201), denoted as P X ; S6. The first air pressure sensor (105) monitors the air pressure in the top air chamber (104), denoted P Y ; S7. The pressurizing device (4) continues to pressurize the air pressure chamber (201) until the air pressure in the air pressure chamber (201) reaches P. X +△P, the electrically controlled valve (207) of the booster branch pipe (206) is closed; S8. When the NMP liquid tank (1) is stored, the second air pressure sensor (204) monitors the air pressure in the air pressure cavity (201); When the air pressure in the air pressure cavity (201) decreases, the system outputs an "air pressure leakage" alarm for the auxiliary air pressure pipe (2); When the pressure in the gas pressure cavity (201) does not decrease, the first gas pressure sensor (105) monitors the pressure in the top gas cavity (104) in real time. When the first gas pressure sensor (105) detects that the pressure in the top gas cavity (104) is less than P Y , the system outputs an "NMP liquid tank (1) storage pressure leakage" alarm.

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