Pressure protection device

Abstract

The utility model belongs to the technical field of pressure containers, and discloses a pressure protection device which comprises a pipeline assembly and a liquid container, the pipeline assembly is provided with a first gas circulation opening, a second gas circulation opening, a low-pressure release opening and a high-pressure release opening, and the first gas circulation opening is used for being connected with a closed container; the liquid container comprises a first liquid hopper, a second liquid hopper, a first liquid cavity, a second liquid cavity and an overflow cavity, the first liquid hopper and the first liquid cavity are arranged in parallel, the bottom of the first liquid cavity is communicated with the bottom of the second liquid cavity, and the second liquid hopper is located above the first liquid hopper; the overflow cavity is connected with the second liquid cavity and the high-pressure release port, the second liquid hopper is connected with the low-pressure release port and the second gas circulation port, and the first liquid hopper is connected with the first gas circulation port. The pressure protection device can prevent the closed container from being damaged due to too high build-up pressure or too low negative pressure, and is simple in structure, convenient to use and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to airtight container technical field especially relates to a pressure protection device. BACKGROUND

[0002] In the actual production of various trades and professions, some containers need to be closed to ensure that the odor or toxic gas or flammable and explosive gas in the container does not overflow. But at the same time, the container is easy to produce overpressure (positive pressure) or underpressure (negative pressure), thereby damaging the container and causing safety accidents. The existing pressure protection device is usually used for pressure relief when the pressure is too high, and cannot play a good protective role on the closed container when the pressure is too low. Although there is a high-low pressure protection device in the prior art, the structure is relatively complex and the manufacturing cost is relatively high. SUMMARY

[0003] The utility model discloses a kind of pressure protection devices, which can prevent closed container from being damaged due to overpressure or underpressure, and the structure is simple, convenient to use, and the manufacturing cost is lower.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] The utility model discloses a kind of pressure protection devices, which is used to balance the pressure in closed container, and the pressure protection device includes: pipeline assembly, the pipeline assembly has first gas flow pass, second gas flow pass, low pressure release port and high pressure release port, the first gas flow pass is used to be connected with closed container, and the second gas flow pass is used to communicate with external environment;Liquid container, the liquid container includes first liquid bucket, second liquid bucket, first liquid cavity, second liquid cavity and overflow chamber, the first liquid bucket is arranged in parallel with the first liquid cavity, the bottom of the first liquid cavity is communicated with the bottom of the second liquid cavity, the second liquid bucket is located above the first liquid bucket, the overflow chamber is connected with the second liquid cavity and the high pressure release port, the second liquid bucket is connected with the low pressure release port and the second gas flow pass, and the first liquid bucket is connected with the first gas flow pass.

[0006] In some embodiments, the pipeline assembly includes first gas pipeline, second gas pipeline and third gas pipeline, the first gas pipeline is used to be sealed with the closed container Connection, the second gas pipeline is used to communicate with external environment, the first pipe mouth of the third gas pipeline is connected with the second gas pipeline, the second pipe mouth of the third gas pipeline constitutes the low pressure release port, and the third pipe mouth of the third gas pipeline constitutes the high pressure release port.

[0007] In some specific embodiments, the first gas pipeline comprises a main pipe, a first branch pipe and a second branch pipe, one end of the main pipe is connected to the sealed container, the other end is connected to the second branch pipe, one end of the first branch pipe is connected to the main pipe, the other end is connected to the liquid container, one end of the second branch pipe, which is away from the main pipe, is connected to the third gas pipeline.

[0008] In some more specific embodiments, the first branch pipe is provided with a normally open control valve, and the second branch pipe is provided with a normally closed control valve.

[0009] In some specific embodiments, a fire arrestor is arranged at the connection position between the second gas pipeline and the first pipe opening of the third gas pipeline.

[0010] In some embodiments, the liquid container is provided with a first connecting pipe, a second connecting pipe and a third connecting pipe on the outer side wall, the first connecting pipe is connected to the first gas flow opening, one end of the second connecting pipe is connected to the low-pressure release opening, the other end extends into the second liquid cup, and the end of the second connecting pipe extending into the second liquid cup is provided with a plurality of air vents, and the third connecting pipe is connected to the high-pressure release opening.

[0011] In some specific embodiments, the second connecting pipe is provided with a liquid supplementing pipeline for supplementing liquid.

[0012] In some embodiments, the liquid container is further provided with an emptying opening and a liquid discharging opening, the emptying opening is connected to the first liquid cup, and the liquid discharging opening is connected to the overflow cavity.

[0013] In some embodiments, the liquid container is provided with an observation window on the outer side wall, and the observation window is used to observe the liquid level in the liquid container.

[0014] In some specific embodiments, the observation window is four, and is arranged corresponding to the first liquid cup, the second liquid cup, the first liquid cavity and the second liquid cavity respectively.

[0015] The utility model discloses beneficial effect: in actual work process, pressure protection device works before preparation state, guarantee first liquid bucket, second liquid bucket, first liquid cavity and second liquid cavity are in the state of filling pressure protection solution. When the pressure in the closed container is overpressure, the gas in the closed container enters the pressure protection device from the first gas flow passage, and because of overpressure, the liquid in the first liquid bucket is pressed into the first liquid cavity, and the liquid in the first liquid cavity is pressed into the second liquid cavity, that is to say, in actual work process, the liquid level in the first liquid cavity will reduce with the pressure rising, until the pressure reaches the highest pressure set, when the liquid level in the first liquid cavity reduces to the specified height, the water seal formed in the first liquid bucket and the first liquid cavity is broken, so that the gas in the closed container flows from the second liquid cavity, overflow chamber to the second gas flow passage, and finally is discharged from the second gas flow passage to the external environment, realizes pressure relief effect, so as to guarantee that the pressure in the closed container does not exceed the highest pressure set, so as to reach overpressure protection. When the pressure in the closed container is lower, the external gas enters the low-pressure release port from the second gas flow passage, and then enters the second liquid bucket, and the working liquid level in the second liquid bucket will reduce with the pressure in the pressure protection device reducing, until the pressure reaches the lowest negative pressure set, the water seal in the second liquid bucket is broken, and the external gas can flow from the second liquid bucket to the first gas flow passage and enter the closed container, realizes pressure balance in the closed container, guarantees that the pressure in the closed container is not lower than the lowest negative pressure set, so as to reach negative pressure protection. The pressure protection device can prevent the closed container from being damaged due to overpressure or too low negative pressure. And the pressure protection device only includes a pipeline assembly and a liquid container for containing pressure protection liquid, only needs to inject the pressure protection liquid in the liquid container in the use process, and the structure is simple, convenient to use, and the manufacturing cost is low.

[0016] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic diagram of pressure protection device of the utility model embodiment;

[0018] Figure 2 It is the gas flow direction schematic diagram of pressure protection device of the utility model embodiment when the pressure in the closed container is too high;

[0019] Figure 3 It is the gas flow direction schematic diagram of pressure protection device of the utility model embodiment when the pressure in the closed container is too low;

[0020] Figure 4 It is the structure schematic diagram of first direction of liquid container of the utility model embodiment;

[0021] Figure 5 is a structural schematic view of a second direction of the liquid container of an embodiment of the utility model;

[0022] Figure 6 is a structural schematic view of a third direction of the liquid container of an embodiment of the utility model.

[0023] Reference signs:

[0024] 100, pipeline assembly; 101, first gas flow port; 102, second gas flow port; 103, low pressure release port; 104, high pressure release port; 110, first gas pipeline; 111, main pipe; 112, first branch pipe; 113, second branch pipe; 120, second gas pipeline; 130, third gas pipeline;

[0025] 200, liquid container; 210, first liquid bucket; 220, second liquid bucket; 230, first liquid cavity; 240, second liquid cavity; 250, overflow cavity; 260, first connecting pipe; 270, second connecting pipe; 271, air vent; 280, third connecting pipe; 290, observation window; 201, emptying port; 202, liquid discharge port;

[0026] 300, normally open control valve; 400, normally closed control valve; 500, flame arrestor; 600, liquid supplement pipeline. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0028] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0030] The utility model discloses a pressure protection device, pressure protection device is used for balancing the pressure in the closed container, reference Figures 1-6 The pressure protection device includes a pipeline assembly 100 and a liquid container 200, the pipeline assembly 100 has first gas flow port 101, second gas flow port 102, low pressure release port 103 and high pressure release port 104, first gas flow port 101 is used to be connected with the closed container, second gas flow port 102 is used to communicate with the external environment. Liquid container 200 includes first liquid bucket 210, second liquid bucket 220, first liquid cavity 230, second liquid cavity 240 and overflow chamber 250, first liquid bucket 210 is arranged in parallel with first liquid cavity 230, the bottom of first liquid cavity 230 is communicated with the bottom of second liquid cavity 240, second liquid bucket 220 is located above first liquid bucket 210, overflow chamber 250 is connected with second liquid cavity 240 and high pressure release port 104, second liquid bucket 220 is connected with low pressure release port 103 and second gas flow port 102, first liquid bucket 210 is connected with first gas flow port 101. Reference Figure 2 The gas in the closed container can be sequentially discharged to the external environment from high pressure release port 104 through first gas flow port 101, first liquid bucket 210, first liquid cavity 230, second liquid cavity 240 and overflow chamber 250; reference Figure 3 The external gas can enter the closed container through second liquid bucket 220, low pressure release port 103 and first gas flow port 101 in sequence.

[0031] It can be understood that, in actual working process, the pressure protection device is in a state of being ready for work, and the first liquid tank 210, the second liquid tank 220, the first liquid cavity 230 and the second liquid cavity 240 are in a state of being filled with the pressure protection solution. When the pressure in the sealed container is overpressure, the gas in the sealed container enters the pressure protection device from the first gas flow passage 101, and due to the overpressure, the liquid in the first liquid tank 210 is pressed into the first liquid cavity 230, and the liquid in the first liquid cavity 230 is pressed into the second liquid cavity 240, that is, in actual working process, the liquid level in the first liquid cavity 230 will be lowered with the continuous increase of the pressure, until the pressure reaches the set maximum pressure (for example, +4.5 kPa), and the water seal formed in the first liquid tank 210 and the first liquid cavity 230 is broken, so that the gas in the sealed container flows from the second liquid cavity 240, the overflow cavity 250 to the second gas flow passage 102, and finally is discharged to the external environment from the second gas flow passage 102, so as to realize pressure relief, so as to ensure that the pressure in the sealed container does not exceed the set maximum pressure (for example, +4.5 kPa), so as to achieve overpressure protection.

[0032] When the pressure in the sealed container is low, the external gas enters the low-pressure release port 103 from the second gas flow passage 102, and then enters the second liquid tank 220, and the working liquid level in the second liquid tank 220 will be lowered with the continuous decrease of the pressure in the pressure protection device, until the pressure reaches the set minimum negative pressure (for example, -0.5 kPa), and the water seal in the second liquid tank 220 is broken, so that the external gas can flow from the second liquid tank 220 to the first gas flow passage and enter the sealed container, so as to realize pressure balance in the sealed container, and ensure that the pressure in the sealed container is not lower than the set minimum negative pressure (for example, -0.5 kPa), so as to achieve negative pressure protection

[0033] In summary, the pressure protection device can prevent the sealed container from being damaged due to overpressure or too low negative pressure. The pressure protection device only includes necessary pipeline components 100 and a liquid container 200 for containing the pressure protection liquid, and only needs to inject the pressure protection liquid into the liquid container 200 in use, so that the structure is simple, the use is convenient, and the manufacturing cost is low.

[0034] It should be noted that when the pressure protection device is in an overpressure state, the water in the second liquid tank 220 will also be pressed into the corresponding pipeline component 100, causing the liquid level in the corresponding pipeline component 100 to rise, and when the pressure in the pressure protection device reaches the set maximum pressure (for example, +4.5 kPa), the second liquid tank 220 can still maintain the water seal function, so as to avoid that the high-pressure gas breaks the water seal from the second liquid tank 220 position in the overpressure state, so as to reduce the pressure relief effect of the pressure protection device.

[0035] ReferenceFigures 2-3 As shown, the pipeline assembly 100 comprises a first gas pipeline 110, a second gas pipeline 120, and a third gas pipeline 130. The first gas pipeline 110 is used to be sealingly connected with the closed container. The second gas pipeline 120 is used to be in communication with the external environment. The first pipe opening of the third gas pipeline 130 is connected with the second gas pipeline 120. The second pipe opening of the third gas pipeline 130 constitutes a low-pressure release port 103. The third pipe opening of the third gas pipeline 130 constitutes a high-pressure release port 104. It can be understood that the first gas pipeline 110 can realize the sealing connection with the closed container, and can also ensure the sealing of the connection position of the entire pressure protection device and the closed container during the process of ensuring the pressure protection of the closed container by the pressure protection device, so as to avoid the leakage phenomenon. By providing the third gas pipeline 130 with three pipe openings, the gas can be selectively discharged from the third pipe opening of the third gas pipeline 130 to the external environment or discharged from the low-pressure release port 103 into the closed container according to the pressure state in the closed container during actual work, so as to ensure that the pressure protection device can stably play a role in pressure protection.

[0036] Optionally, the end of the first gas pipeline 110, the first pipe opening, the second pipe opening, and the third pipe opening of the third gas pipeline 130, and the end of the second gas pipeline 120 are all provided with flanges. In this way, the installation of the first gas pipeline 110, the second gas pipeline 120, and the third gas pipeline 130 is facilitated, and the sealing connection of the connection position is improved.

[0037] Reference Figures 2-3 As shown, the first gas pipeline 110 comprises a main pipe 111, a first branch pipe 112, and a second branch pipe 113. One end of the main pipe 111 is used to be sealingly connected with the closed container, and the other end is connected with the second branch pipe 113. One end of the first branch pipe 112 is connected with the main pipe 111, and the other end is connected with the liquid container 200. The end of the second branch pipe 113 away from the main pipe 111 is connected with the third gas pipeline 130. It can be understood that, in actual work, the first branch pipe 112 is in a flow-through state, and the second branch pipe 113 is in a cut-off state. When the pressure protection device is in overpressure protection, the gas in the closed container can flow out of the liquid container 200 through the first branch pipe 112. When the pressure protection device is in negative pressure protection, the external gas can flow to the liquid container 200 through the first branch pipe 112. The second branch pipe 113 is only used for maintenance or needs to pour or extract gas into or out of the closed container, so that the gas can directly enter or exit the closed container without passing through the liquid container 200, thereby facilitating the maintenance or pouring or extracting gas into or out of the closed container.

[0038] Optionally, the first branch pipe 112 is provided with a normally open control valve 300, and the second branch pipe 113 is provided with a normally closed control valve 400. It can be understood that, when the pressure protection device is normally working, the normally open control valve 300 and the normally closed control valve 400 do not need to be operated, and when maintenance or the like is needed, the normally open control valve 300 is closed, and the normally closed control valve 400 is opened, so that the gas can directly enter or exit the closed container without passing through the liquid container 200, thereby facilitating maintenance or filling or extracting the gas into the closed container. Of course, in the embodiment of the utility model, the normally open control valve 300 and the normally closed control valve 400 can be both manual valves, or can be both automatic valves, or one can be a manual valve and the other can be an automatic valve, and the specific setting can be made according to actual needs.

[0039] Optionally, a flame arrester 500 is arranged at the connection position of the second gas pipeline 120 and the first pipe opening of the third gas pipeline 130. It can be understood that the flame arrester 500 can avoid the phenomenon that the combustible gas in the closed container burns at the first pipe opening of the second gas pipeline 120 or the third gas pipeline 130, thereby facilitating the improvement of the working safety of the pressure protection device of the embodiment.

[0040] Reference Figures 4-6 As shown, the outer side wall of the liquid container 200 is connected with a first connecting pipe 260, a second connecting pipe 270 and a third connecting pipe 280, the first connecting pipe 260 is connected with the first gas flow opening 101, one end of the second connecting pipe 270 is sealingly connected with the low-pressure release opening 103, the other end of the second connecting pipe 270 extends into the second liquid bucket 220, and the end of the second connecting pipe 270 extending into the second liquid bucket 220 is provided with a plurality of air vents 271, and the third connecting pipe 280 is sealingly connected with the high-pressure release opening 104. It can be understood that, in actual working process, the liquid surface in the second liquid bucket 220 is higher than the air vents 271, so that a stable water seal is formed, when the pressure in the closed container is too low, the gas in the second liquid bucket 220 can be lowered under the pressure of the external gas, when the air vents 271 are leaked, the water seal in the second liquid bucket 220 is damaged, and the external gas can enter the first connecting pipe 260 through the air vents 271, and then enter the closed container through the first gas flow opening 101.

[0041] Optionally, the second connecting pipe 270 is provided with a liquid supplementing pipeline 600 for supplementing liquid. The liquid supplementing pipeline 600 can supplement the pressure protection solution in the liquid container 200, so as to ensure that the liquid container has enough pressure protection solution, and ensure the normal working of the pressure protection device.

[0042] Optionally, the liquid container 200 is also provided with a drain port 201 and a liquid outlet 202. The drain port 201 is connected with the first liquid cup 210, and the liquid outlet 202 is connected with the overflow cavity 250. The liquid outlet 202 is connected with a U-shaped pipe, and the liquid outlet 202 is always open, so as to ensure that the pressure protection liquid in the overflow cavity 250 can be stably discharged, and to ensure that the water seal formed in the first liquid cup 210 and the first liquid cavity 230 can be stably broken when the pressure in the sealed container is too high, so as to ensure that the sealed container can be stably relieved. The drain port 201 is used for draining, and the drain port 201 is generally always closed. When it is necessary to maintain and overhaul the liquid container 200, the drain port 201 is opened, so as to facilitate the discharge of the pressure protection solution in the liquid container 200. Further optionally, the drain port and the drain port 201 are generally designed as DN25, and of course, they can also be designed according to actual needs.

[0043] Optionally, the outer side wall of the liquid container 200 is provided with an observation window 290, which is used for observing the liquid level in the liquid container 200. It can be understood that the user can observe the liquid level in the liquid container 200 from the observation window 290, so as to facilitate the user to observe the liquid level in the liquid container 200, thereby supplementing the pressure protection liquid in time. Further optionally, the observation window 290 is four, and is respectively arranged corresponding to the first liquid cup 210, the second liquid cup 220, the first liquid cavity 230 and the second liquid cavity 240. This facilitates the user to observe the liquid level in the first liquid cup 210, the second liquid cup 220, the first liquid cavity 230 and the second liquid cavity 240, thereby supplementing the pressure protection liquid in time.

[0044] It needs to be additionally supplemented that the pipeline assembly 100 and the liquid container 200 are made of stainless steel 304 or stainless steel 316, which can be designed according to the corrosiveness of the materials and gases in the sealed container. The main size of the liquid container 200 is 690mm (length) x 424mm (width) x 1000mm (height), and the thickness is 4mm. Of course, the size of the liquid container 200 can also be designed according to the process requirements and the size of the pressure protection.

[0045] The pressure protection solution in the liquid container 200 includes pure water, antifreeze, aqueous solution and the like, which is designed according to the materials in the sealed container and the working environment of the sealed container.

[0046] Reference Figure 2 and Figure 3As shown, the distance between the upper edge of the vent 271 and the top of the second liquid chamber 220 is h, h is 50 mm, the distance between the top of the first liquid chamber 230 and the upper edge of the communication port between the first liquid chamber 230 and the second liquid chamber 240 is H1, H1 is 450, and the distance between the upper edge of the vent 271 and the liquid level in the third connecting pipe 280 is H2, H2 is 450 mm. Thus, when the pressure in the sealed container is greater than 4.5 kPa or lower than 0.5 kPa, the pressure protection device of the embodiment can play a protective role.

[0047] The working process of the pressure protection device of the embodiment will be described in detail below.

[0048] Overpressure protection: the gas in the sealed container passes through the first gas flow port 101, the main pipe 111, the first branch pipe 112, and the normally open control valve 300 into the pressure protection device. Due to overpressure, the liquid in the first liquid chamber 210 is pressed into the first liquid chamber 230, and the liquid in the first liquid chamber 230 is pressed into the second liquid chamber 240. When the pressure reaches the set maximum pressure (+4.5 kPa), the liquid level in the first liquid chamber 230 is lowered to expose the communication port between the first liquid chamber 230 and the second liquid chamber 240, and the water seal formed in the first liquid chamber 210 and the first liquid chamber 230 is broken, so that the gas in the sealed container passes through the second liquid chamber 240, the overflow chamber 250, the third connecting pipe 280, and the second connecting pipe 270, and finally flows out from the second gas flow port 102 of the second gas pipeline 120, realizing pressure relief.

[0049] Negative pressure protection: the external gas enters the third gas pipeline 130 from the second gas flow port 102, and then enters the second liquid chamber 220. The working liquid level in the second liquid chamber 220 will be lowered as the pressure in the pressure protection device is continuously lowered, until the pressure reaches the set minimum negative pressure (such as -0.5 kPa). When the liquid level in the second liquid chamber 220 is lower than the vent 271, the water seal in the second liquid chamber 220 is broken, and the external gas can flow from the second liquid chamber 220 to the first gas flow port 101, and enter the sealed container, realizing pressure charging of the sealed container.

[0050] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A pressure protection device, characterized in that The pressure protection device is used for balancing pressure in a sealed container, and comprises: A pipeline assembly (100) having a first gas flow port (101), a second gas flow port (102), a low-pressure release port (103) and a high-pressure release port (104), wherein the first gas flow port (101) is used for being connected with the sealed container, and the second gas flow port (102) is used for being communicated with an external environment; A liquid container (200) comprising a first liquid tank (210), a second liquid tank (220), a first liquid cavity (230), a second liquid cavity (240) and an overflow cavity (250), wherein the first liquid tank (210) is arranged in parallel with the first liquid cavity (230), the bottom of the first liquid cavity (230) is communicated with the bottom of the second liquid cavity (240), the second liquid tank (220) is arranged above the first liquid tank (210), the overflow cavity (250) is connected with the second liquid cavity (240) and the high-pressure release port (104), the second liquid tank (220) is connected with the low-pressure release port (103) and the second gas flow port (102), and the first liquid tank (210) is connected with the first gas flow port (101).

2. The pressure protection device of claim 1, wherein The pipeline assembly (100) comprises a first gas pipeline (110), a second gas pipeline (120) and a third gas pipeline (130), wherein the first gas pipeline (110) is used for being sealedly connected with the sealed container, the second gas pipeline (120) is used for being communicated with the external environment, the first pipe opening of the third gas pipeline (130) is connected with the second gas pipeline (120), the second pipe opening of the third gas pipeline (130) constitutes the low-pressure release port (103), and the third pipe opening of the third gas pipeline (130) constitutes the high-pressure release port (104).

3. The pressure protection device of claim 2, wherein, The first gas pipeline (110) comprises a main pipe (111), a first branch pipe (112) and a second branch pipe (113), wherein one end of the main pipe (111) is used for being sealedly connected with the sealed container, the other end is connected with the second branch pipe (113), one end of the first branch pipe (112) is connected with the main pipe (111), the other end is connected with the liquid container (200), and one end of the second branch pipe (113) away from the main pipe (111) is connected with the third gas pipeline (130).

4. The pressure protection device of claim 3, wherein The first branch pipe (112) is provided with a normally-opened control valve (300), and the second branch pipe (113) is provided with a normally-closed control valve (400).

5. The pressure protection device of claim 2, wherein The second gas pipeline (120) is provided with a flame arrester (500) at a connection position of the first pipe opening of the third gas pipeline (130).

6. The pressure protection device according to any one of claims 1-5, characterized in that, The outer side wall of the liquid container (200) is connected with a first connecting pipe (260), a second connecting pipe (270) and a third connecting pipe (280), the first connecting pipe (260) is connected with the first gas flow passage (101), one end of the second connecting pipe (270) is sealingly connected with the low-pressure release port (103), the other end of the second connecting pipe (270) extends into the second liquid bucket (220), a plurality of air vents (271) are arranged on the end of the second connecting pipe (270) extending into the second liquid bucket (220), and the third connecting pipe (280) is sealingly connected with the high-pressure release port (104).

7. The pressure protection device of claim 6, wherein The second connecting pipe (270) is provided with a liquid supplementing pipeline (600) for supplementing liquid.

8. The pressure protection device of any one of claims 1-5, wherein, The liquid container (200) is further provided with an emptying port (201) and a liquid discharging port (202), the emptying port (201) is connected with the first liquid bucket (210), and the liquid discharging port (202) is connected with the overflow cavity (250).

9. The pressure protection device of any one of claims 1-5, wherein, The outer side wall of the liquid container (200) is provided with observation windows (290), and the observation windows (290) are used for observing the liquid level in the liquid container (200).

10. The pressure protection device of claim 9, wherein, The observation windows (290) are four, and are respectively arranged corresponding to the first liquid bucket (210), the second liquid bucket (220), the first liquid cavity (230) and the second liquid cavity (240).

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