Intelligent pressure-regulating inflatable switch cabinet

Abstract

The utility model belongs to the technical field of inflatable switch cabinets, and particularly relates to an intelligent pressure-regulating inflatable switch cabinet, which comprises a cabinet body, an air box is fixedly arranged in the cabinet body, a first partition plate is fixedly arranged in the air box, the top space of the first partition plate is an electrical equipment cavity, an electrical component is fixedly assembled in the electrical equipment cavity, and the electrical component is arranged in the cabinet body. A second partition plate is fixedly arranged on one side of the bottom end of the first partition plate, a storage chamber and an equipment chamber are arranged on the left side and the right side of the second partition plate respectively, a pressure relief pipe is fixedly arranged at the position, between the electrical equipment cavity and the storage chamber, of one side of the bottom end of the first partition plate in a penetrating mode, and a pressure relief mechanism is arranged in the pressure relief pipe. The pressure relief mechanism only allows gas in the electrical equipment cavity to be discharged to the storage chamber, a discharge pipe is fixedly arranged on one side of the storage chamber in a penetrating mode, an electromagnetic valve is fixedly arranged on the discharge pipe, through cooperation of the pressure relief mechanism, the gas pressure in the electrical equipment cavity is automatically relieved to a set gas pressure value when the temperature is high, and the internal gas pressure is prevented from being too high.

Description

Technical Field

[0001] The utility model belongs to the technical field of inflatable switch cabinets, in particular to an inflatable switch cabinet with intelligent voltage regulation. Background Art

[0002] The inflatable switchgear is a new generation of switchgear. The whole cabinet adopts a design that combines air insulation with sulfur hexafluoride gas compartments. This design is not only compact and easy to expand, but also particularly suitable for power distribution automation. The inflatable switchgear is widely used in many fields such as mines, oil fields, chemical plants, etc., where the environment is relatively harsh or has special requirements.

[0003] The main working principle of the existing inflatable switchgear is to seal high-voltage components, such as busbars, circuit breakers, disconnectors, transformers, etc., in a gas box filled with a relatively low pressure of 0.1-0.5 MPa SF6 or other gas. This design makes the switchgear less susceptible to damage from the external natural environment, such as dust, dirt, animals, compounds, etc.

[0004] At present, the inflatable switch cabinet in the prior art has the following disadvantages: when the inflatable switch cabinet is used in an area with a large temperature difference between day and night, the air pressure in the gas box will change. When the temperature rises, the movement of gas molecules accelerates, the volume expands, and the density decreases, resulting in an increase in air pressure. When the temperature drops, the movement of gas molecules slows down, the volume shrinks, the density increases, and the air pressure decreases. This change in air pressure will affect the optimal insulation and arc extinguishing performance of the switch cabinet, thereby affecting its normal operation. In addition, if the air pressure changes too much, it may also cause damage to the structure of the switch cabinet and even cause a safety accident. The existing inflatable switch cabinet cannot self-regulate the air pressure according to the change in temperature difference, which greatly reduces the safety of the equipment. Therefore, in view of the above problems, an inflatable switch cabinet with intelligent pressure regulation is proposed. Utility Model Content

[0005] In order to make up for the shortcomings of the existing inflatable switchgear, the problem that the air pressure in the gas box will change when the inflatable switchgear is used in areas with a large temperature difference between day and night is solved. When the temperature rises, the movement of gas molecules accelerates, the volume expands, the density decreases, and the air pressure increases. When the temperature drops, the movement of gas molecules slows down, the volume shrinks, the density increases, and the air pressure decreases. This change in air pressure will affect the optimal insulation and arc extinguishing performance of the switchgear, thereby affecting its normal operation. In addition, if the air pressure changes too much, it may also cause damage to the structure of the switchgear and even cause a safety accident. The existing inflatable switchgear cannot self-adjust the air pressure according to the change in temperature difference, which greatly reduces the safety of the equipment. An inflatable switchgear with intelligent pressure regulation is proposed.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes an intelligent pressure-regulating inflatable switch cabinet, comprising a cabinet body, an air box is fixedly arranged inside the cabinet body, a first partition is fixedly arranged inside the air box, the top space of the first partition is an electrical equipment cavity, electrical components are fixedly assembled in the electrical equipment cavity, a second partition is fixedly arranged on one side of the bottom end of the first partition, a storage chamber and an equipment chamber are respectively disposed on the left and right sides of the second partition, a pressure relief pipe is fixedly arranged and penetrated between the electrical equipment cavity and the storage chamber on one side of the bottom end of the first partition, a pressure relief mechanism is arranged in the pressure relief pipe, and the pressure relief mechanism only allows the gas in the electrical equipment cavity to be discharged to the storage chamber, a discharge pipe is fixedly arranged on one side of the storage chamber, a solenoid valve is fixedly arranged on the discharge pipe, and the air pressure in the electrical equipment cavity is automatically relieved to a set air pressure value when the temperature is high through the cooperation of the pressure relief mechanism to prevent the internal air pressure from being too high.

[0007] Preferably, the pressure relief mechanism includes a sealing seat arranged at the top position of the inner wall of the pressure relief pipe, a pressure relief hole is provided in the center of the sealing seat, a guide through hole is provided on the pressure relief pipe, a movable seat is movably provided in the pressure relief pipe, a first guide rod is provided on the movable seat, the first guide rod slides through the guide through hole, a pressure sensor is fixedly provided at the top center of the movable seat, a connecting ball is fixedly provided at the top of the pressure sensor, a spring is fixedly provided at the top of the connecting ball, a sealing ball is fixedly provided at the top of the spring, and the bottom end of the pressure relief hole is matched with the top of the sealing ball. The sealing ball is fixedly provided with a second guide rod, the second guide rod slides through the guide through hole, a rack is fixedly provided at one end of the first guide rod, a servo motor is fixedly provided at one side of the outside of the air box through a fixing frame, the output end of the servo motor is fixedly connected with a rotating shaft through a coupling, and the rotating shaft rotates through a bearing and passes through the storage chamber, and a gear is fixedly provided at one end of the rotating shaft, the gear is meshed with the teeth of the rack, and the pressure relief pressure value of the pressure relief mechanism can be adjusted through the cooperation between the above structures, thereby improving practicality and scope of application.

[0008] Preferably, a first air pressure sensor is fixedly provided on one side of the inner wall of the storage room, a second air pressure sensor is fixedly provided on one side of the inner wall of the electrical equipment cavity, and a display controller is fixedly provided on one side of the cabinet. The output ends of the first air pressure sensor and the second air pressure sensor are electrically connected to the data processing end of the display controller through wires, and the output control end of the display controller is electrically connected to the input end of the servo motor through wires. Through the cooperation between the above-mentioned devices, the air pressure data can be monitored in real time to facilitate the adjustment of the air pressure.

[0009] Preferably, a sealing groove is provided at the bottom end of the sealing seat, an inflatable rubber ring is fixedly arranged in the sealing groove, and a sealing ring cooperating with the sealing groove is provided at the top end of the sealing ball. The sealing performance is improved by the cooperation of the sealing groove, the sealing ring and the inflatable rubber ring.

[0010] Preferably, a gas pump is fixedly installed in the equipment room by a fixing frame, the air intake and exhaust ports of the gas pump are respectively connected to the storage room and the electrical equipment cavity through air pipes, and a one-way valve is fixedly installed in the air pipe connected to the electrical equipment cavity, the input end of the gas pump is electrically connected to the output end of the display controller through a wire, and through the cooperation of the gas pump and the display controller, the air pressure can be replenished in time when it is lower than the set value.

[0011] Beneficial effects of the utility model:

[0012] The utility model provides an inflatable switch cabinet with intelligent pressure regulation. First, the staff needs to set the air pressure in the cavity of the electrical equipment through the display controller. Then the display controller will start the servo motor according to the set air pressure value, so as to adjust the compression degree of the spring. When the spring is compressed, it will generate a reaction force by itself. The pressure sensor monitors the pressure and sends it to the data processing end of the display controller in real time for analysis. The implemented pressure is compared with the air pressure setting value. When the pressure value of the pressure sensor is consistent with the set air pressure value, the display controller controls to turn off the servo motor, and the compression state of the spring is locked. When the temperature difference between day and night is large, the air pressure in the cavity of the electrical equipment increases. , the air pressure is higher than the set air pressure value, that is, higher than the limited pressure value of the spring, the air pressure pushes the sealing ball downward, so that the pressure relief hole is opened, and the gas in the electrical equipment cavity is discharged into the storage room through the pressure relief hole. At the same time, the second air pressure sensor monitors the air pressure in the electrical equipment cavity in real time. When the temperature difference between day and night is large and the air pressure in the electrical equipment cavity decreases, the air pressure is lower than the set air pressure value, and the display controller controls to turn on the gas pump to draw the gas in the storage room into the electrical equipment cavity until the air pressure inside it reaches the set air pressure value, and then controls to turn off the gas pump. Through the cooperation between the above-mentioned equipment, the inflatable switchgear can self-adjust the air pressure according to the change of temperature difference, which greatly improves the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0014] Figure 1 It is a three-dimensional picture of the whole;

[0015] Figure 2 This is a diagram of the internal structure of the gas box;

[0016] Figure 3 yes Figure 2 The enlarged structure diagram at A in the middle;

[0017] Figure 4 yes Figure 3 The enlarged structure diagram at B in the middle;

[0018] Figure 5 yes Figure 2 The enlarged structure diagram at C in the middle;

[0019] Legend:

[0020] 1. Cabinet; 101. Air box; 2. Electrical equipment cavity; 3. First partition; 4. Second partition; 5. Storage room; 6. Equipment room; 7. Pressure relief pipe; 8. Sealing seat; 9. Pressure relief hole; 10. Guide through hole; 11. Moving seat; 12. First guide rod; 13. Pressure sensor; 14. Connecting ball; 15. Spring; 16. Sealing ball; 17. Second guide rod; 18. Rack; 19. Servo motor; 20. Gear; 21. First air pressure sensor; 22. Second air pressure sensor; 23. Display controller; 24. Sealing groove; 25. Inflatable rubber ring; 26. Sealing ring; 27. Gas pump; 28. Discharge pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Specific examples are given below.

[0023] See also Figure 1-Figure 5 The utility model discloses an intelligent pressure-regulated inflatable switch cabinet, comprising a cabinet body 1, wherein an air box 101 is fixedly arranged inside the cabinet body 1, wherein a first partition 3 is fixedly arranged inside the air box 101, wherein the top space of the first partition 3 is an electrical equipment chamber 2, wherein electrical components are fixedly assembled inside the electrical equipment chamber 2, wherein a second partition 4 is fixedly arranged on one side of the bottom end of the first partition 3, wherein a storage chamber 5 and an equipment chamber 6 are respectively arranged on the left and right sides of the second partition 4, wherein a pressure relief pipe 7 is fixedly arranged and penetrated between the electrical equipment chamber 2 and the storage chamber 5 on one side of the bottom end of the first partition 3, wherein a pressure relief pipe 7 is fixedly arranged and penetrated, wherein a pressure relief mechanism is arranged inside the pressure relief pipe 7, and the pressure relief mechanism only allows the gas in the electrical equipment chamber 2 to be discharged to the storage chamber 5, wherein a discharge pipe 28 is fixedly arranged on one side of the storage chamber 5, wherein a solenoid valve is fixedly arranged on the discharge pipe 28;

[0024] The pressure relief mechanism includes a sealing seat 8 arranged at the top position of the inner wall of the pressure relief pipe 7, a pressure relief hole 9 is provided in the center of the sealing seat 8, a guide through hole 10 is provided on the pressure relief pipe 7, a movable seat 11 is movably provided in the pressure relief pipe 7, a first guide rod 12 is provided on the movable seat 11, the first guide rod 12 slides through the guide through hole 10, a pressure sensor 13 is fixedly provided at the top center of the movable seat 11, a connecting ball 14 is fixedly provided at the top of the pressure sensor 13, a spring 15 is fixedly provided at the top of the connecting ball 14, a sealing ball 16 is fixedly provided at the top of the spring 15, the bottom end of the pressure relief hole 9 is a groove that cooperates with the top of the sealing ball 16, a second guide rod 17 is fixedly provided on the sealing ball 16, the second guide rod 17 slides through the guide through hole 10, the first guide A rack 18 is fixedly provided at one end of the rod 12, a servo motor 19 is fixedly provided at one side of the outside of the air box 101 through a fixing frame, an output end of the servo motor 19 is fixedly connected to a rotating shaft through a coupling, and the rotating shaft rotates through a bearing and penetrates into the storage chamber 5, and a gear 20 is fixedly provided at one end of the rotating shaft, and the gear 20 is meshed with the teeth of the rack 18, a first air pressure sensor 21 is fixedly provided at one side of the inner wall of the storage chamber 5, a second air pressure sensor 22 is fixedly provided at one side of the inner wall of the electrical equipment cavity 2, a display controller 23 is fixedly provided at one side of the cabinet 1, the output ends of the first air pressure sensor 21 and the second air pressure sensor 22 are electrically connected to the data processing end of the display controller 23 through wires, and the output control end of the display controller 23 is electrically connected to the input end of the servo motor 19 through wires;

[0025] A gas pump 27 is fixedly installed in the equipment room 6 through a fixing frame, and the air intake and exhaust ports of the gas pump 27 are respectively connected to the storage room 5 and the electrical equipment chamber 2 through an air pipe, and a one-way valve is fixedly installed in the air pipe connected to the electrical equipment chamber 2. The input end of the gas pump 27 is electrically connected to the output end of the display controller 23 through a wire. When working, in order to adjust the air pressure in the electrical equipment chamber 2 of the inflatable switch cabinet according to the temperature difference, so that the air pressure in the electrical equipment chamber 2 is always maintained at the set air pressure value to improve the safety of the equipment, first the staff needs to set the air pressure in the electrical equipment chamber 2 through the display controller 23, and then the display controller 23 will be displayed. The display controller 23 will start the servo motor 19 according to the set air pressure value, so as to adjust the compression degree of the spring 15. The servo motor 19 starts to drive the rotating shaft and the gear 20 to rotate, and the gear 20 drives the rack 18 to move up and down. The rack 18 drives the first guide rod 12 and the moving seat 11 to move up and down. The moving seat 11 drives the pressure sensor 13 and the connecting ball 14 to move. At the same time, the spring 15 is compressed. When the spring 15 is compressed, it generates a reaction force. The pressure sensor 13 monitors the pressure and sends it to the data processing end of the display controller 23 in real time for analysis, and compares the implemented pressure with the air pressure setting value. When the pressure sensor 13 When the pressure value is consistent with the set air pressure value, the display controller 23 controls to close the servo motor 19, and the compression state of the spring 15 is locked. When the temperature difference between day and night is large, the air pressure in the electrical equipment cavity 2 increases, and the air pressure is higher than the set air pressure value, that is, higher than the limited pressure value of the spring 15. The air pressure pushes the sealing ball 16 to move downward, so that the pressure relief hole 9 is opened, and the gas in the electrical equipment cavity 2 is discharged into the storage chamber 5 through the pressure relief hole 9. At the same time, the first air pressure sensor 21 monitors the air pressure in the storage chamber 5 in real time, and sends the air pressure data to the data processing end of the display controller 23 for comparison. When the air pressure data is higher than the air pressure in the electrical equipment cavity 2, the display controller 23 The controller 23 controls the opening of the solenoid valve on the discharge pipe 28 to release the pressure, so that the air pressure in the storage chamber 5 is always lower than the air pressure in the electrical equipment cavity 2. At the same time, the second air pressure sensor 22 monitors the air pressure in the electrical equipment cavity 2 in real time. When the temperature difference between day and night is large and the air pressure in the electrical equipment cavity 2 decreases, the air pressure is lower than the set air pressure value. The display controller 23 controls the opening of the gas pump 27 to pump the gas in the storage chamber 5 into the electrical equipment cavity 2 until the air pressure inside it reaches the set air pressure value, and then controls the closing of the gas pump 27. Through the cooperation between the above-mentioned devices, the inflatable switch cabinet can self-regulate the air pressure according to the change of temperature difference, which greatly improves the safety of the equipment.

[0026] Furthermore, a sealing groove 24 is provided at the bottom end of the sealing seat 8, and an inflatable rubber ring 25 is fixedly arranged in the sealing groove 24. A sealing ring 26 cooperating with the sealing groove 24 is provided at the top end of the sealing ball 16. During operation, in order to improve the sealing performance of the sealing ball 16 and prevent gas leakage in the electrical equipment cavity 2, the sealing ball 16 presses against the sealing seat 8 while driving the sealing ring 26 to insert into the sealing groove 24. The sealing ring 26 squeezes the inflatable rubber ring 25, so that the inflatable rubber ring 25 is deformed and covers the sealing groove 24, thereby improving the sealing performance and preventing gas leakage.

[0027] Working principle: In order to adjust the air pressure in the electrical equipment cavity 2 of the inflatable switch cabinet according to the temperature difference, so that the air pressure in the electrical equipment cavity 2 is always maintained at the set air pressure value to improve the safety of the equipment, the staff first needs to set the air pressure in the electrical equipment cavity 2 through the display controller 23, and then the display controller 23 will start the servo motor 19 according to the set air pressure value, thereby adjusting the compression degree of the spring 15, and the servo motor 19 starts to drive the rotating shaft and the gear 20 to rotate, and the gear 20 drives the rack 18 to move up and down, and the rack 18 drives the first guide rod 12 and the moving seat 11 to move up and down, and the moving seat 11 drives the pressure sensor 13 and the connecting ball 14 move, and the spring 15 is compressed. When the spring 15 is compressed, it generates a reaction force. The pressure sensor 13 monitors the pressure and sends it to the data processing end of the display controller 23 in real time for analysis. The implemented pressure is compared with the air pressure setting value. When the pressure value of the pressure sensor 13 is consistent with the set air pressure value, the display controller 23 controls to turn off the servo motor 19, and the compression state of the spring 15 is locked. When the temperature difference between day and night is large, the air pressure in the electrical equipment cavity 2 increases, and the air pressure is higher than the set air pressure value, that is, higher than the limited pressure value of the spring 15, the air pressure pushes the sealing ball 16 to move downward. The pressure relief hole 9 is opened, and the gas in the electrical equipment cavity 2 is discharged into the storage chamber 5 through the pressure relief hole 9. At the same time, the first air pressure sensor 21 monitors the air pressure in the storage chamber 5 in real time, and sends the air pressure data to the data processing end of the display controller 23 for comparison. When the air pressure data is higher than the air pressure in the electrical equipment cavity 2, the display controller 23 controls the opening of the solenoid valve on the discharge pipe 28 to release the pressure, so that the air pressure in the storage chamber 5 is always lower than the air pressure in the electrical equipment cavity 2. At the same time, the second air pressure sensor 22 monitors the air pressure in the electrical equipment cavity 2 in real time. When the temperature difference between day and night is large, causing the air pressure in the electrical equipment cavity 2 to decrease, the air pressure is lower than the set air pressure value, and the display controller 23 controls the opening of the solenoid valve on the discharge pipe 28 to release the pressure. The controller 23 controls the opening of the gas pump 27 to pump the gas in the storage chamber 5 into the electrical equipment cavity 2 until the air pressure inside it reaches the set air pressure value, and then controls the closing of the gas pump 27. Through the cooperation between the above-mentioned devices, the inflatable switch cabinet can self-regulate the air pressure according to the change of temperature difference, which greatly improves the safety of the equipment; in order to improve the sealing performance of the sealing ball 16 to prevent gas leakage in the electrical equipment cavity 2, the sealing ball 16 abuts against the sealing seat 8 and drives the sealing ring 26 to be inserted into the sealing groove 24. The sealing ring 26 squeezes the inflatable rubber ring 25, so that the inflatable rubber ring 25 is deformed and covers the sealing groove 24, thereby improving the sealing performance and preventing gas leakage.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation 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.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An intelligent pressure regulating inflatable switch cabinet, Features: The invention comprises a cabinet (1), wherein an air box (101) is fixedly arranged inside the cabinet (1), wherein a first partition (3) is fixedly arranged inside the air box (101), wherein the top space of the first partition (3) is an electrical equipment chamber (2), wherein electrical components are fixedly installed inside the electrical equipment chamber (2), wherein a second partition (4) is fixedly arranged on one side of the bottom end of the first partition (3), wherein the left and right sides of the second partition (4) are a storage chamber (5) and an equipment chamber (6), respectively, wherein a pressure relief pipe (7) is fixedly arranged and penetrated between the electrical equipment chamber (2) and the storage chamber (5) on one side of the bottom end of the first partition (3), wherein a pressure relief pipe (7) is fixedly arranged and penetrated, wherein a pressure relief mechanism is arranged inside the pressure relief pipe (7), and wherein the pressure relief mechanism only allows the gas in the electrical equipment chamber (2) to be discharged to the storage chamber (5), wherein a discharge pipe (28) is fixedly arranged on one side of the storage chamber (5), and wherein a solenoid valve is fixedly arranged on the discharge pipe (28).

2. According to claim 1, an intelligent voltage-regulating inflatable switch cabinet, Features: The pressure relief mechanism comprises a sealing seat (8) arranged at the top position of the inner wall of the pressure relief pipe (7), a pressure relief hole (9) is provided at the center of the sealing seat (8), a guide through hole (10) is provided on the pressure relief pipe (7), a movable seat (11) is movably provided in the pressure relief pipe (7), a first guide rod (12) is provided on the movable seat (11), the first guide rod (12) is slidably penetrated through the guide through hole (10), a pressure sensor (13) is fixedly provided at the top center of the movable seat (11), a connecting ball (14) is fixedly provided at the top of the pressure sensor (13), a spring (15) is fixedly provided at the top of the connecting ball (14), and the top of the spring (15) is fixedly provided A sealing ball (16) is provided, the bottom end of the pressure relief hole (9) is a groove that cooperates with the top of the sealing ball (16), a second guide rod (17) is fixedly provided on the sealing ball (16), the second guide rod (17) slides through the guide through hole (10), a rack (18) is fixedly provided at one end of the first guide rod (12), a servo motor (19) is fixedly provided on one side of the outside of the air box (101) through a fixing frame, the output end of the servo motor (19) is fixedly connected to a rotating shaft through a coupling, and the rotating shaft rotates through a bearing and penetrates into the storage chamber (5), and a gear (20) is fixedly provided at one end of the rotating shaft, and the gear (20) meshes with the teeth of the rack (18).

3. According to claim 1, an intelligent voltage-regulating inflatable switch cabinet, Features: A first air pressure sensor (21) is fixedly arranged on one side of the inner wall of the storage chamber (5), a second air pressure sensor (22) is fixedly arranged on one side of the inner wall of the electrical equipment chamber (2), and a display controller (23) is fixedly arranged on one side of the cabinet (1); the output ends of the first air pressure sensor (21) and the second air pressure sensor (22) are electrically connected to the data processing end of the display controller (23) through a wire, and the output control end of the display controller (23) is electrically connected to the input end of the servo motor (19) through a wire.

4. According to claim 2, an intelligent voltage-regulating inflatable switch cabinet, Features: A sealing groove (24) is provided at the bottom end of the sealing seat (8), an inflatable rubber ring (25) is fixedly arranged in the sealing groove (24), and a sealing ring (26) matching the sealing groove (24) is provided at the top end of the sealing ball (16).

5. According to claim 1, an intelligent voltage-regulating inflatable switch cabinet, Features: A gas pump (27) is fixedly arranged in the equipment room (6) via a fixing frame, and an air intake port and an air exhaust port of the gas pump (27) are respectively connected to the storage room (5) and the electrical equipment chamber (2) via air pipes, and a one-way valve is fixedly arranged in the air pipe connected to the electrical equipment chamber (2), and an input end of the gas pump (27) is electrically connected to an output end of the display controller (23) via a wire.

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