Pressure vessel with safety control structure

Abstract

The invention discloses a pressure vessel with a safety control structure, which relates to the technical field of pressure vessels and comprises a pressure chamber mounted on the upper portion of a pressure vessel body, the pressure chamber is communicated with the pressure vessel body, a pressure relief chamber is mounted on the upper portion of the pressure chamber, and a sealing plate is mounted between the pressure chamber and the pressure relief chamber. And a plurality of groups of pressure relief holes in a circumferential array are formed in the sealing plate. The pressure vessel has the beneficial effects that by arranging the pressure pipe, when materials in the pressure vessel body generate violent chemical reaction and generate a large amount of gas, the gas instantly enters the pressure pipe and pushes the telescopic pipe to rise through air pressure, and the telescopic pipe drives the pressure relief plate on the sealing plate to slide through the connecting rod, so that the pressure relief hole in the sealing plate is opened; the larger the sliding distance of the pressure relief plate driven by the telescopic pipe is, the larger the opening of the pressure relief hole is, the higher the pressure relief capacity of the pressure relief hole is, and the safety of the pressure vessel body is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessels, in particular to a pressure vessel with a safety control structure. Background Art

[0002] Pressure vessels are closed equipment used to store or process gases, liquids and other media. Their internal pressure is usually higher or lower than atmospheric pressure. They are widely used in industries such as petrochemicals, energy, pharmaceuticals, and food processing. Pressure vessels are widely used. They play an important role in many sectors such as industry, civil industry, military industry, and many fields of scientific research. Among them, the most used are in the chemical industry and petrochemical industry. The pressure vessels used in the petrochemical industry alone account for about 50% of the total number of pressure vessels. In the chemical and petrochemical fields, pressure vessels are mainly used in process processes such as heat transfer, mass transfer, and reaction, as well as the storage and transportation of pressurized gases or liquefied gases; they are also widely used in other industrial and civil fields, such as air compressors, various special compressors, and auxiliary machines of refrigeration compressors (coolers, buffers, oil-water separators, gas storage tanks, evaporators, liquid coolant storage tanks, etc.) are all pressure vessels.

[0003] In order to avoid safety accidents such as explosions caused by excessive internal pressure, some pressure vessels are usually equipped with pressure relief valves to ensure the safety of the pressure vessels. However, in the process of chemical reactions in traditional pressure vessels, the materials inside may have a short and violent reaction, producing a large amount of gas, causing the air pressure inside the container to increase significantly in a short period of time. The pressure relief channel in the pressure relief valve adopts a fixed design and cannot be adjusted with the pressure in the pressure vessel. The pressure relief capacity of the pressure relief valve is limited when the air pressure in the pressure vessel increases sharply in a short period of time, resulting in poor safety of the pressure vessel when there is a violent reaction in the pressure vessel. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that during the process of chemical reaction in the existing pressure vessel, the materials inside may have a short and violent reaction, produce a large amount of gas, and greatly increase the air pressure inside the container in a short time, while the pressure relief channel in the pressure relief valve adopts a fixed design and cannot be adjusted with the pressure in the pressure vessel. The pressure relief capacity of the pressure relief valve is limited when the air pressure in the pressure vessel increases sharply in a short time, resulting in the disadvantage that the safety of the pressure vessel is poor when there is a violent reaction in the pressure vessel, and a pressure vessel with a safety control structure is provided.

[0005] The objective of the present invention is achieved through the following technical solutions: a pressure vessel with a safety control structure, comprising a pressure chamber installed on the upper part of the pressure vessel body, the pressure chamber is connected to the pressure vessel body, a pressure relief chamber is installed on the upper part of the pressure chamber, a sealing plate is installed between the pressure chamber and the pressure relief chamber, a plurality of groups of pressure relief holes in a circumferential array are provided in the sealing plate, a plurality of groups of pressure relief holes are slidably connected with pressure relief plates, a pressure pipe is installed in the pressure chamber, an air inlet end of the pressure pipe extends into the pressure vessel body, a liftable telescopic pipe is installed at one end of the pressure pipe close to the sealing plate, a plurality of groups of connecting rods respectively connected to the plurality of groups of pressure relief plates are installed on the telescopic pipe, both ends of the connecting rods are rotatably connected to the pressure relief plates and the telescopic pipe, and a plurality of connecting rods extending to the pressure vessel are arranged The pressure tube in the body can produce a large amount of gas when the material in the pressure vessel body produces a violent chemical reaction in a short time. The gas instantly enters the pressure tube and pushes the telescopic tube up through the air pressure. The telescopic tube drives the pressure relief plate on the sealing plate to slide through the connecting rod, so that the pressure relief hole on the sealing plate is opened, and the gas enters the pressure relief chamber for pressure relief, thereby achieving rapid pressure relief in a short time. The greater the air pressure, the higher the height of the telescopic tube. At the same time, the greater the distance the telescopic tube drives the pressure relief plate to slide, the greater the pressure relief hole is opened, so that the greater the air pressure generated by the chemical reaction in the pressure vessel body, the stronger the pressure relief capacity of the pressure relief hole, and the timely adjustment of pressure relief is carried out according to the change of air pressure in the pressure vessel body, which effectively improves the safety of the pressure vessel body; A sliding rod extending into the telescopic tube is installed at the bottom of the sealing plate. The sliding rod is slidably connected to the telescopic tube. A spring is sleeved on the sliding rod. The two ends of the spring are respectively connected to the sealing plate and the telescopic tube. By arranging the sliding rod and the spring in coordination, when the air pressure in the pressure vessel body continues to decrease, the spring pushes the telescopic tube to reset, and at the same time the pressure relief plate slowly closes the pressure relief hole, thereby realizing automatic reset of the telescopic tube and the pressure relief plate, and adopts a mechanical structure to relieve pressure in the pressure vessel body to improve the stability of equipment operation.

[0006] A further technical solution is that a limit groove is provided on the upper part of the pressure relief plate, an electric push rod is installed on the pressure relief chamber, a limit block compatible with the limit groove is installed on the telescopic end of the electric push rod, and a pressure sensor is installed on the pressure vessel body. The pressure sensor and the electric push rod are both connected to an external control center. By setting the pressure sensor and the electric push rod to be connected to the external control center, the pressure holding reaction threshold in the pressure vessel body can be set. When the pressure sensor detects that the air pressure in the pressure vessel body is lower than the set pressure holding reaction threshold, the electric push rod drives the limit block to be inserted into the limit groove to fix the pressure relief plate, thereby ensuring that the pressure relief hole seals the pressure relief plate, so that the air pressure in the pressure vessel body reaches the pressure holding reaction threshold, thereby ensuring the rapid response of the material in the pressure vessel body.

[0007] A further technical solution is that the pressure relief hole is arranged in a fan shape. The fan-shaped arrangement of the pressure relief hole can make the exhaust area of ​​the pressure relief hole increase continuously as the pressure relief plate moves during the process of sliding to open the pressure relief hole, thereby effectively improving the pressure relief capacity of the pressure relief hole.

[0008] A further technical solution is that a first sliding groove is opened on the side wall of the pressure tube, and the telescopic tube is slidably connected to the first sliding groove. By setting the telescopic tube and the first sliding groove to be slidably connected, the connection strength between the telescopic tube and the pressure tube can be effectively improved, and the stability of the pressure tube sliding on the telescopic tube can be improved.

[0009] A further technical solution is that a second slide groove matched with the pressure relief plate is opened on the inner side of the pressure relief hole, and the pressure relief plate is slidably connected to the second slide groove. The provision of the second slide groove can improve the stability of the pressure relief plate moving in the pressure relief hole, so that the pressure relief plate can open or close the pressure relief hole more smoothly.

[0010] A further technical solution is that the air outlet of the pressure relief chamber is connected to a pressure relief tank through a pressure relief pipe. By setting up the pressure relief tank, the gas at the pressure relief point of the pressure relief chamber can be collected, which is convenient for recovering the pressure-relieved gas to avoid waste, and also prevents the gas from being discharged to the outside and polluting the environment.

[0011] A further technical solution is that the gas outlet end of the pressure relief tank is connected to the pressure vessel body through a one-way valve, and the one-way valve is connected to an external control center. By setting a one-way valve connected to the external control center, when the external control center detects through a pressure sensor that the air pressure in the pressure vessel body is lower than a certain value, the external control center controls the one-way valve to open, and the collected gas is then transported to the pressure vessel body for recycling, thereby improving the safety of the equipment.

[0012] The present invention has the following advantages: by arranging a pressure tube extending into the body of the pressure vessel, when the material in the pressure vessel body produces a violent chemical reaction in a short time and produces a large amount of gas, the gas instantly enters the pressure tube and pushes the telescopic tube to rise through the air pressure, and the telescopic tube drives the pressure relief plate on the sealing plate to slide through the connecting rod, so that the pressure relief hole on the sealing plate is opened, and the gas enters the pressure relief chamber for pressure relief, thereby achieving rapid pressure relief in a short time. The greater the air pressure generated, the higher the height of the telescopic tube rising. At the same time, the greater the distance the telescopic tube drives the pressure relief plate to slide, the greater the pressure relief hole is opened, thereby achieving the greater the air pressure generated by the chemical reaction in the pressure vessel body, the stronger the pressure relief capacity of the pressure relief hole, and the timely adjustment of pressure relief following the change of air pressure in the pressure vessel body, effectively improving the safety of the pressure vessel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 2 It is a partial cross-sectional schematic diagram of the three-dimensional structure of the pressure chamber of the present invention; Figure 3 It is a partial cross-sectional schematic diagram of the three-dimensional structure of the pressure chamber of the present invention from another angle; Figure 4 For the present invention Figure 1 A magnified schematic diagram of the structure in the middle; Figure 5 It is a front view schematic diagram of the overall structure of the present invention; In the figure, 1. pressure vessel body; 2. pressure chamber; 3. sealing plate; 4. pressure relief chamber; 5. pressure relief hole; 6. pressure relief plate; 7. pressure pipe; 8. telescopic pipe; 9. connecting rod; 10. pressure sensor; 11. first slide groove; 12. pressure relief pipe; 13. electric push rod; 14. limit block; 15. fixing rod; 16. sliding rod; 17. spring; 18. limit groove; 19. pressure relief tank; 20. one-way valve; 21. second slide groove. DETAILED DESCRIPTION In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0016] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] like Figure 1~Figure 5As shown, a pressure vessel with a safety control structure comprises a pressure chamber 2 installed on the upper part of the pressure vessel body 1, the pressure chamber 2 is connected with the pressure vessel body 1, a pressure relief chamber 4 is installed on the upper part of the pressure chamber 2, a sealing plate 3 is installed between the pressure chamber 2 and the pressure relief chamber 4, a plurality of groups of pressure relief holes 5 in a circumferential array are provided on the sealing plate 3, a pressure relief plate 6 is slidably connected in the plurality of groups of pressure relief holes 5, a pressure tube 7 is installed in the pressure chamber 2, an inner wall of the pressure chamber 2 is connected with the pressure tube 7 through a fixing rod 15, an air inlet end of the pressure tube 7 extends into the pressure vessel body 1, a liftable telescopic tube 8 is installed at one end of the pressure tube 7 close to the sealing plate 3, a plurality of groups of connecting rods 9 respectively connected with the plurality of groups of pressure relief plates 6 are installed on the telescopic tube 8, both ends of the connecting rod 9 are rotatably connected with the pressure relief plate 6 and the telescopic tube 8, and by setting The pressure tube 7 extending into the pressure vessel body 1 can produce a large amount of gas when the material in the pressure vessel body 1 produces a violent chemical reaction in a short time. The gas instantly enters the pressure tube 7 and pushes the telescopic tube 8 up through the air pressure. The telescopic tube 8 drives the pressure relief plate 6 on the sealing plate 3 to slide through the connecting rod 9, so that the pressure relief hole 5 on the sealing plate 3 is opened, so that the gas enters the pressure relief chamber 4 for pressure relief, thereby achieving rapid pressure relief in a short time. The greater the air pressure generated, the higher the height of the telescopic tube 8 rises. At the same time, the greater the distance that the telescopic tube 8 drives the pressure relief plate 6 to slide, the greater the pressure relief hole 5 is opened, so that the greater the air pressure generated by the chemical reaction in the pressure vessel body 1, the better the pressure relief capacity of the pressure relief hole 5, and the timely adjustment pressure relief is performed following the change of the air pressure in the pressure vessel body 1, which effectively improves the safety of the pressure vessel body 1; A slide bar 16 extending into the telescopic tube 8 is installed at the bottom of the sealing plate 3. The slide bar 16 is slidably connected to the telescopic tube 8. A spring 17 is sleeved on the slide bar 16. The two ends of the spring 17 are respectively connected to the sealing plate 3 and the telescopic tube 8. By arranging the slide bar 16 and the spring 17 to cooperate with each other, when the air pressure in the pressure vessel body 1 continues to decrease, the spring 17 can push the telescopic tube 8 to reset, and at the same time, the pressure relief plate 6 slowly closes the pressure relief hole 5, thereby realizing the automatic reset of the telescopic tube 8 and the pressure relief plate 6. At the same time, the spring 17 can also provide a certain pressure to the telescopic tube 8 when the air pressure in the pressure vessel body 1 is low, to ensure the sealing effect of the pressure relief plate 6 on the pressure relief hole 5 when the air pressure is low, and to avoid gas leakage from the pressure vessel body 1. This structure uses a mechanical structure to relieve pressure in the pressure vessel body 1, thereby improving the stability of equipment operation; A limiting groove 18 is provided on the upper part of the pressure relief plate 6, and an electric push rod 13 is installed on the pressure relief chamber 4. The telescopic end of the electric push rod 13 extends into the pressure relief chamber 4 and is installed with a limiting block 14 adapted to the limiting groove 18. A pressure sensor 10 is installed on the pressure vessel body 1. The pressure sensor 10 and the electric push rod 13 are both connected to an external control center. By setting the pressure sensor 10 and the electric push rod 13 to be connected to the external control center, the pressure holding reaction threshold in the pressure vessel body 1 can be set. When the pressure sensor 10 detects that the air pressure in the pressure vessel body 1 is lower than the set pressure holding reaction threshold, the electric push rod 13 drives the limiting block 14 to be inserted into the limiting groove 18 to fix the pressure relief plate 6, thereby ensuring that the pressure relief hole 5 seals the pressure relief plate 6, so that the air pressure in the pressure vessel body 1 reaches the pressure holding reaction threshold, thereby ensuring the rapid response of the material in the pressure vessel body 1.

[0020] The pressure relief hole 5 is arranged in a fan shape. The fan-shaped arrangement of the pressure relief hole 5 enables the exhaust area of ​​the pressure relief hole 5 to increase continuously as the pressure relief plate 6 moves during the process of sliding to open the pressure relief hole 5, thereby effectively improving the pressure relief capacity of the pressure relief hole 5.

[0021] A first slide groove 11 is provided on the side wall of the pressure tube 7, and the telescopic tube 8 is slidably connected to the first slide groove 11. By setting the telescopic tube 8 to be slidably connected to the first slide groove 11, the connection strength between the telescopic tube 8 and the pressure tube 7 can be effectively improved, and the stability of the pressure tube 7 sliding on the telescopic tube 8 can be improved.

[0022] A second slide groove 21 adapted to the pressure relief plate 6 is opened on the inner side of the pressure relief hole 5, and the pressure relief plate 6 is slidably connected to the second slide groove 21. The provision of the second slide groove 21 can improve the stability of the pressure relief plate 6 moving in the pressure relief hole 5, so that the pressure relief plate 6 can open or close the pressure relief hole 5 more smoothly.

[0023] The gas outlet end of the pressure relief chamber 4 is connected to a pressure relief tank 19 through a pressure relief pipe 12. By setting up the pressure relief tank 19, the gas at the pressure relief point of the pressure relief chamber 4 can be collected, which is convenient for recycling the pressure-relieved gas to avoid waste and also avoid gas discharge to the outside to pollute the environment. The gas outlet end of the pressure relief tank 19 is connected to the pressure vessel body 1 through a one-way valve 20, and the one-way valve 20 is connected to an external control center. By setting up the one-way valve 20 connected to the external control center, when the external control center detects through the pressure sensor 10 that the air pressure in the pressure vessel body 1 is lower than a certain value, the external control center controls the one-way valve 20 to open, and the collected gas is then transported to the pressure vessel body 1 for recycling, thereby improving the safety of the equipment.

[0024] The working process of the present invention is as follows: when the pressure vessel is used for chemical reaction, the required materials are first added into the pressure vessel body 1 through the feed end of the pressure vessel body 1, and then the feed end of the pressure vessel body 1 is closed. When the materials in the pressure vessel body 1 react violently in a short time to generate a large amount of heat and gas, causing the air pressure in the pressure vessel body 1 to suddenly increase significantly, the gas first enters the pressure tube 7 extending into the pressure vessel body 1, so that the air pressure pushes the telescopic tube 8 to rise and compress the spring 17. When the telescopic tube 8 rises, it drives the pressure relief plate 6 to slide through the connecting rod 9, thereby opening the pressure relief hole 5 on the sealing plate 3, so that the pressure vessel A large amount of gas in the pressure vessel body 1 is discharged into the pressure relief chamber 4 through the pressure relief hole 5 for pressure relief. The greater the air pressure generated by the pressure vessel body 1, the higher the distance the telescopic tube 8 rises, and the greater the distance the telescopic tube 8 drives the pressure relief plate 6 to slide, so that the pressure relief area of ​​the pressure relief hole 5 is larger, and self-regulating pressure relief is achieved. The pressure relief pipe 12 on the pressure relief chamber 4 can introduce other materials into the pressure relief tank 19 for collection and temporary storage, thereby ensuring the safety of the pressure vessel body 1. When the reaction intensity of the material in the pressure vessel body 1 gradually decreases, the spring 17 can drive the telescopic tube 8 to reset when the air pressure decreases, so that when the telescopic tube 8 is reset, it drives the pressure relief plate 6 to close the pressure relief hole 5; When the material in the pressure vessel body 1 needs to reach a certain pressure-maintaining reaction threshold for effective reaction, a pressure threshold greater than the required pressure-maintaining reaction threshold can be set by the external control center. At the initial stage of the reaction, the external control center controls the electric push rod 13 to drive the limit block 14 to insert into the limit groove 18 on the pressure relief plate 6, and the pressure relief plate 6 is limited and fixed to keep the pressure relief hole 5 sealed, thereby preventing the gas in the pressure vessel body 1 from being released through the pressure relief hole 5, making it difficult for the air pressure in the pressure vessel body 1 to reach the required pressure-maintaining reaction threshold. As the air pressure in the pressure vessel body 1 rises to reach the pressure-maintaining reaction threshold, the material in the pressure vessel body 1 fully reacts, and the pressure The force sensor 10 continuously monitors the air pressure in the pressure vessel body 1. When the pressure sensor 10 detects that the air pressure in the pressure vessel body 1 reaches the pressure threshold set by the external control center, and the pressure exceeds the set pressure threshold and continues to rise, which is dangerous, the external control center controls the electric push rod 13 to drive the limit block 14 to rise to release the limit on the pressure relief plate 6. The pressure relief plate 6 slides in the pressure relief hole 5 to relieve pressure, thereby ensuring the safety of the equipment. As the reaction intensity decreases, when the pressure value in the pressure vessel body 1 is lower than a certain value, the one-way valve 20 can be opened by the external control center to transport the gas collected in the pressure relief tank 19 to the pressure vessel body 1 for recovery.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure vessel with a safety control structure, comprising a pressure chamber (2) installed on the upper part of the pressure vessel body (1), the pressure chamber (2) being connected to the pressure vessel body (1), characterized in that: A pressure relief chamber (4) is installed on the upper part of the pressure chamber (2), a sealing plate (3) is installed between the pressure chamber (2) and the pressure relief chamber (4), a plurality of groups of pressure relief holes (5) are provided on the sealing plate (3) in a circumferential array, and a pressure relief plate (6) is slidably connected in each of the plurality of groups of pressure relief holes (5), a pressure pipe (7) is installed in the pressure chamber (2), an air inlet end of the pressure pipe (7) extends into the pressure vessel body (1), a liftable telescopic pipe (8) is installed at one end of the pressure pipe (7) close to the sealing plate (3), a plurality of groups of connecting rods (9) respectively connected to the plurality of groups of pressure relief plates (6) are installed on the telescopic pipe (8), and both ends of the connecting rod (9) are rotatably connected to the pressure relief plate (6) and the telescopic pipe (8), respectively; A sliding rod (16) extending into the telescopic tube (8) is installed at the bottom of the sealing plate (3), the sliding rod (16) is slidably connected to the telescopic tube (8), a spring (17) is sleeved on the sliding rod (16), and two ends of the spring (17) are respectively connected to the sealing plate (3) and the telescopic tube (8).

2. A pressure vessel with a safety control structure according to claim 1, characterized in that: A limit groove (18) is provided on the upper portion of the pressure relief plate (6); an electric push rod (13) is installed on the pressure relief chamber (4); a limit block (14) matching the limit groove (18) is installed at the telescopic end of the electric push rod (13); a pressure sensor (10) is installed on the pressure vessel body (1); and both the pressure sensor (10) and the electric push rod (13) are connected to an external control center.

3. A pressure vessel with a safety control structure according to claim 1, characterized in that: The pressure relief hole (5) is arranged in a fan shape.

4. A pressure vessel with a safety control structure according to claim 1, characterized in that: A first sliding groove (11) is provided on the side wall of the pressure pipe (7), and the telescopic pipe (8) is slidably connected to the first sliding groove (11).

5. The pressure vessel with a safety control structure according to claim 1, characterized in that: A second slide groove (21) adapted to the pressure relief plate (6) is provided on the inner side of the pressure relief hole (5), and the pressure relief plate (6) is slidably connected to the second slide groove (21).

6. A pressure vessel with a safety control structure according to claim 2, characterized in that: The gas outlet end of the pressure relief chamber (4) is connected to a pressure relief tank (19) via a pressure relief pipe (12).

7. A pressure vessel with a safety control structure according to claim 6, characterized in that: The gas outlet end of the pressure relief tank (19) is connected to the pressure vessel body (1) via a one-way valve (20), and the one-way valve (20) is connected to an external control center.

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