A fixed AC indoor ring network cabinet

Abstract

The present invention discloses a fixed AC indoor ring network cabinet, which relates to the technical field of electrical equipment. The present invention includes a cabinet door hingedly mounted on a cabinet body, and also includes: a pressure relief part, which is used for pressure relief when the pressure in the cabinet body increases, and the pressure relief part includes two movable grooves arranged on the inner wall of the cabinet body, and two L-shaped pressure relief grooves are arranged on the side wall of the cabinet body, and the two pressure relief grooves are respectively interconnected with the corresponding movable grooves, and a plugging component matched with the two movable grooves is installed on the cabinet body. The advantages are: the indoor ring network cabinet of the present invention can realize repeated pressure relief, and can prevent the problem of false pressure relief caused by accidental touch, and can automatically cool the cabinet body and spray trifluoroiodomethane liquid inside during the pressure relief process, which effectively prevents the further increase of the pressure in the cabinet body, and has the effect of cooling and heat dissipation and fire prevention and fire extinguishing for the internal components, and can greatly reduce the loss caused by the pressure increase.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, and in particular to a fixed AC indoor ring network cabinet. Background Art

[0002] The ring main unit is an electrical device consisting of a group of high-voltage switchgear installed in a steel plate metal cabinet or made into an assembled interval ring main unit. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. It has been widely used in distribution stations and box-type substations in urban residential areas, high-rise buildings, large public buildings, factories and enterprises and other load centers. Among them, the ring main units used in buildings are indoor ones, which are generally installed in basements or special distribution rooms.

[0003] During the use of indoor ring network cabinets, explosion and fire prevention are particularly important. Therefore, most of them will be installed with pressure relief devices to release pressure in time when a fault occurs and the internal pressure increases, so as to avoid damage or explosion of components due to excessive internal pressure. The pressure relief devices used in existing indoor ring network cabinets need to be replaced and reinstalled by staff after being triggered once, and cannot be reused many times. In addition, they only have a simple pressure relief function. If the components in the cabinet have short-circuited and burned, they cannot be effectively remedied, which is likely to cause greater losses. Therefore, it is necessary to design a fixed AC indoor ring network cabinet. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a fixed AC indoor ring main unit, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fixed AC indoor ring main unit, comprising a cabinet door hingedly mounted on a cabinet body, and further comprising:

[0007] A pressure relief part, which is used to relieve pressure when the pressure in the cabinet increases. The pressure relief part includes two movable grooves provided on the inner wall of the cabinet. Two L-shaped pressure relief grooves are provided on the side wall of the cabinet, and the two pressure relief grooves are respectively communicated with the corresponding movable grooves. A blocking component matched with the two movable grooves is installed on the cabinet;

[0008] The arc clearing part is used to eliminate the arc when the pressure in the cabinet increases. The arc clearing part includes two storage chambers opened in the cabinet, and the two storage chambers are filled with trifluoroiodomethane liquid. A plurality of one-way spray holes are opened on the inner wall of the cabinet. A delivery pipe is connected between the two storage chambers and the corresponding plurality of one-way spray holes. Two pressure-applying components matching the corresponding storage chambers are installed in the cabinet;

[0009] The trigger part is used to control the operation of the pressure relief part and the arc clearing part. The trigger part includes a main control board slidably installed in the cabinet, and a push rod is fixedly installed at one end of the main control board away from the cabinet door through a fixed column. The push rod cooperates with the blocking component. A delay component is installed between the fixed column and the two pressure-applying components. The delay component is used to make the arc clearing part operate later than the pressure relief part.

[0010] Furthermore, the blocking assembly consists of two sealing plates and two L-shaped rods. The two sealing plates are respectively installed in the corresponding movable grooves for sealing sliding, and the ends of the two sealing plates away from the cabinet door are respectively fixedly connected to the push rods through the corresponding L-shaped rods, and the two L-shaped rods are both slidably connected to the cabinet body.

[0011] Furthermore, the pressure-applying assembly is composed of a screw and a piston plate, the piston plate is sealingly and slidably installed in the storage cavity, the screw is rotatably installed in the cabinet, and one end of the screw located in the storage cavity is threadedly connected to the piston plate.

[0012] Furthermore, the delay assembly consists of a rotating rod, a fixed gear ring, a fixed rack, a slide groove, two incomplete gears and two fixed gears. The rotating rod is rotatably installed in the cabinet, the fixed gear ring is fixedly installed in the middle position of the rotating rod, the fixed rack is fixedly installed on the side wall of the fixed column, and the fixed rack is meshed with the fixed gear ring. The slide groove is opened on the side wall of the cabinet, and the slide groove cooperates with the fixed rack. The two incomplete gears are respectively fixedly installed at both ends of the rotating rod, and the two fixed gears are respectively fixedly installed on two screw rods, and the two fixed gears are respectively matched with the two incomplete gears.

[0013] Furthermore, a sealing groove which is sealingly slidably matched with the main control board is opened on the inner wall of the cabinet, and a spring is installed between the sealing groove and the main control board. A through hole which communicates with the sealing groove is opened on the side wall of the cabinet.

[0014] Furthermore, a controller is fixedly installed in the cabinet, and the controller is electrically connected to a circuit breaker built into the cabinet. A toggle switch electrically connected to the controller is installed on the side wall of the cabinet, and a trigger rod matching the toggle switch is fixedly installed on the side wall of the push rod.

[0015] Furthermore, a cooling cavity is opened in the cabinet, a coolant tank is fixedly installed on the side wall of the cabinet, an input pipe is fixedly connected between the bottom of the coolant tank and the bottom of the cooling cavity, and a one-way return pipe is fixedly connected between the top of the coolant tank and the top of the cooling cavity.

[0016] Furthermore, a servo motor is fixedly mounted on the side wall of the coolant tank, and a lead screw is fixedly connected to the output end of the servo motor. One end of the lead screw located in the coolant tank is threadedly connected to a push plate that is sealingly and slidingly matched with the coolant tank. The servo motor is electrically connected to the controller.

[0017] Furthermore, the tooth spacing between the fixed rack and the fixed gear ring is equal, and the number of teeth on the fixed rack and the fixed gear ring is equal, the tooth spacing of the toothed part on the incomplete gear is equal to that of the fixed gear, and the arc length of the toothed part on the incomplete gear is greater than the circumference of the fixed gear.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1: Through the cooperation of the L-shaped rod and the sealing plate, when the air pressure in the cabinet increases, the pressure relief groove and the movable groove can be connected to relieve the pressure by moving the main control board. Due to the separation design of the pressure relief channel and the main control board and the elastic force of the spring, the pollution and damage to the structure of the main control board can be avoided during the pressure relief process, which is convenient for automatic reset after the pressure relief is completed to achieve repeated use.

[0020] 2: Through the cooperation of the pressure component and the delay component, trifluoroiodomethane liquid can be automatically sprayed into the cabinet during pressure relief to eliminate the arc, and fire prevention and fire extinguishing treatment can be carried out at the same time to reduce the losses caused. In addition, the spraying of trifluoroiodomethane liquid will not be carried out when the main control panel moves, so the problem of accidental spraying of trifluoroiodomethane liquid due to accidental touch can be avoided.

[0021] 3: Through the cooperation of the toggle switch and the trigger rod, the cabinet circuit can be automatically cut off while the pressure is released, and the coolant in the coolant tank can flow in the cooling cavity to achieve cooling and heat dissipation inside the cabinet, effectively reducing the possibility of further pressure increase in the cabinet and providing a certain protection for internal components.

[0022] In summary, the indoor ring main unit of the present invention can achieve repeated pressure relief and can prevent the problem of accidental pressure relief caused by accidental touch. During the pressure relief process, the cabinet can be automatically cooled and trifluoroiodomethane liquid can be sprayed into the interior, which effectively prevents the further increase of pressure in the cabinet, cools and dissipates heat for internal components, and prevents and extinguishes fires, which can greatly reduce the losses caused by increased pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of a fixed AC indoor ring main unit proposed by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure after removing the cabinet door;

[0025] Figure 3 for Figure 2 Schematic diagram of the back structure;

[0026] Figure 4 for Figure 2 A top view of

[0027] Figure 5 for Figure 4 Schematic diagram of the structure of the AA surface in the middle;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure enlargement of part a;

[0029] Figure 7 for Figure 4 Schematic diagram of the structure of the middle BB surface;

[0030] Figure 8 for Figure 3 An enlarged schematic diagram of the structure at the middle coolant tank;

[0031] Fig. 9 for Figure 8 Schematic diagram of the internal structure of the coolant tank;

[0032] Fig.10 for Figure 3 An enlarged schematic diagram of the structure at the middle L-shaped rod;

[0033] Fig.11 for Fig.10 Schematic diagram of the enlarged structure of part b.

[0034] In the figure: 1. cabinet body; 2. cabinet door; 3. moving groove; 4. sealing plate; 5. pressure relief groove; 6. main control board; 7. fixed column; 8. push rod; 9. L-shaped rod; 10. sealing groove; 11. spring; 12. toggle switch; 13. trigger rod; 14. rotating rod; 15. fixed gear ring; 16. fixed rack; 17. slide groove; 18. incomplete gear; 19. storage chamber; 20. lead screw; 21. fixed gear; 22. piston plate; 23. one-way spray hole; 24. delivery pipe; 25. cooling chamber; 26. coolant tank; 27. input pipe; 28. one-way return pipe; 29. ​​servo motor; 30. lead screw; 31. push plate. DETAILED DESCRIPTION

[0035] Reference Figure 1-Figure 11A fixed AC indoor ring main unit comprises a cabinet door 2 hingedly mounted on a cabinet body 1, the cabinet body 1 is divided into three spaces, namely, a busbar room, a circuit breaker room and a cable room from top to bottom, wherein the busbar room comprises a busbar, which is a conductor connected to a power grid and used to distribute electric energy, and this space usually comprises a busbar bar for connecting incoming and outgoing feeders, the circuit breaker room comprises switchgear such as a circuit breaker, a disconnector and a grounding switch, the circuit breaker is used to cut off the current when a fault occurs in the power grid, and the disconnector is used to isolate the power supply during maintenance or overhaul, the cable room usually comprises a cable terminal, a connector and a bracket and a fixing device that may be used to fix the cable terminal, the cabinet door 2 is divided into three, which are respectively opposite to the corresponding busbar room, the circuit breaker room and the cable room, and corresponding locks and other devices are installed thereon, and also comprises:

[0036] The pressure relief part is used to perform pressure relief when the pressure in the cabinet 1 increases. The pressure relief part includes two movable grooves 3 opened on the inner wall of the cabinet 1. Two L-shaped pressure relief grooves 5 are opened on the side wall of the cabinet 1, and the two pressure relief grooves 5 are respectively communicated with the corresponding movable grooves 3. A sealing component matching the two movable grooves 3 is installed on the cabinet 1. The sealing component is composed of two sealing plates 4 and two L-shaped rods 9. The two sealing plates 4 are respectively sealed and slidably installed in the corresponding movable grooves 3. The thickness of the sealing plate 4 is greater than the thickness of the connecting part between the pressure relief groove 5 and the movable groove 3. When the sealing plate 4 moves inward in the movable groove 3 for a certain distance, the sealing of the connecting part between the pressure relief groove 5 and the movable groove 3 can be released. At this time, the gas in the cabinet 1 can be discharged from the pressure relief groove 5 to the outside through the movable groove 3, thereby avoiding the problem of excessive internal pressure of the cabinet 1 causing damage to components or explosion.

[0037] The arc clearing part is used to eliminate the arc when the pressure in the cabinet 1 increases. The arc clearing part includes two storage chambers 19 opened in the cabinet 1, and the two storage chambers 19 are filled with trifluoroiodomethane liquid. Trifluoroiodomethane (CF3I) is a new type of environmentally friendly insulating gas, which is used in the power industry instead of SF6. It has good environmental characteristics and better insulation strength than SF6. At the same time, it will not produce toxic products when it breaks down and decomposes, so it is safer to use.

[0038] A plurality of one-way spray holes 23 are provided on the inner wall of the cabinet 1, and a delivery pipe 24 is connected between the two storage chambers 19 and the corresponding plurality of one-way spray holes 23. Two pressure-applying components matching the corresponding storage chambers 19 are installed in the cabinet 1, and the pressure-applying components are composed of a screw 20 and a piston plate 22. The piston plate 22 is sealingly and slidably installed in the storage chamber 19, and the screw 20 is rotatably installed in the cabinet 1, and one end of the screw 20 located in the storage chamber 19 is threadedly connected to the piston plate 22. When the screw 20 rotates, the piston plate 22 can be driven to move in the storage chamber 19. Through the movement of the storage chamber 19, the trifluoroiodomethane liquid filled in the storage chamber 19 can be sprayed outward from the plurality of one-way spray holes 23 through the delivery pipe 24, and the characteristics of the trifluoroiodomethane liquid are used to eliminate the arc in the cabinet 1, and fire prevention and fire extinguishing treatment is carried out at the same time to reduce the loss caused.

[0039] The trigger part is used to control the operation of the pressure relief part and the arc clearing part. The trigger part includes a main control board 6 slidably installed in the cabinet 1, and the end of the main control board 6 away from the cabinet door 2 is fixedly installed with a push rod 8 through a fixed column 7. The ends of the two sealing plates 4 away from the cabinet door 2 are respectively fixedly connected to the push rod 8 through corresponding L-shaped rods 9. The two L-shaped rods 9 are both slidably connected to the cabinet 1. When the pressure in the cabinet 1 increases, the main control board 6 moves toward the end away from the cabinet door 2 under the action of air pressure. At this time, the sealing plate 4 can be driven by the L-shaped rod 9 to move in the same direction in the moving groove 3, so that the pressure relief groove 5 and the moving groove 3 remain unobstructed, thereby automatically realizing the pressure relief process.

[0040] A sealing groove 10 is provided on the inner wall of the cabinet 1 for sealing and sliding cooperation with the main control board 6. The design of the sealing groove 10 allows the main control board 6 to slide in the cabinet 1 while keeping the inner wall of the cabinet 1 sealed, and a spring 11 is installed between the sealing groove 10 and the main control board 6. The design of the spring 11 can avoid the problem of accidental sliding of the main control board 6 when the pressure in the cabinet 1 is normal. A through hole communicating with the sealing groove 10 is provided on the side wall of the cabinet 1. The design of the through hole can reduce the movement resistance of the cabinet 1 when it slides under the action of air pressure to a certain extent, thereby ensuring that normal pressure relief can be performed when the air pressure in the cabinet 1 increases.

[0041] A controller is fixedly installed in the cabinet 1, and the controller is electrically connected to the built-in circuit breaker in the cabinet 1. The controller and the circuit breaker are not shown in the figure. They are both existing products, so the working principle and specific structure are not elaborated here. A toggle switch 12 electrically connected to the controller is installed on the side wall of the cabinet 1, and a trigger rod 13 matching the toggle switch 12 is fixedly installed on the side wall of the push rod 8. When the main control board 6 moves due to the air pressure in the cabinet 1, the movement of the push rod 8 drives the trigger rod 13 to move at the same time, so that the toggle switch 12 is toggled once. At this time, the controller trips the circuit breaker, switches the cabinet 1 with the external circuit, and cuts off the power to the components in the cabinet 1 to reduce the risk of short circuit.

[0042] A delay component is installed between the fixed column 7 and the two pressure-applying components. The delay component is used to make the arc clearing part run later than the pressure relief part. The delay component consists of a rotating rod 14, a fixed gear ring 15, a fixed rack 16, a slide 17, two incomplete gears 18 and two fixed gears 21. The rotating rod 14 is rotatably installed in the cabinet 1, the fixed gear ring 15 is fixedly installed in the middle position of the rotating rod 14, the fixed rack 16 is fixedly installed on the side wall of the fixed column 7, and the fixed rack 16 is meshed with the fixed gear ring 15. The slide 17 is opened on the side wall of the cabinet 1, and the slide 17 is matched with the fixed rack 16. The two incomplete gears 18 are respectively fixedly installed at both ends of the rotating rod 14, and the two fixed gears 21 are respectively fixedly installed on the two screw rods 20, and the two fixed gears 21 are respectively matched with the two incomplete gears 18;

[0043] The tooth spacing of the fixed rack 16 is equal to that of the fixed gear ring 15, and the number of teeth of the fixed rack 16 and the fixed gear ring 15 is equal. The tooth spacing of the toothed portion on the incomplete gear 18 is equal to that of the fixed gear 21, and the arc length of the toothed portion on the incomplete gear 18 is greater than the circumference of the fixed gear 21. Through the size design here, the rotation of the rotating rod 14 can allow the incomplete gear 18 to rotate smoothly for one circle, which is convenient for subsequent resetting. At the same time, when the incomplete gear 18 rotates, it can drive the screw 20 to rotate more circles, which is convenient for the piston plate 22 to move a larger distance to spray a sufficient amount of trifluoroiodomethane liquid.

[0044] by Fig.11The left side is the front side. When the air pressure in the cabinet 1 increases, the main control panel 6 moves to the right. At this time, the meshing effect of the fixed rack 16 and the fixed gear ring 15 causes the rotating rod 14 to rotate counterclockwise, so the two incomplete gears 18 rotate counterclockwise at the same time. At this time, the teeth on the two incomplete gears 18 are not meshed with the fixed gear 21, so the screw rod 20 does not rotate. After the rotating rod 14 rotates a certain amplitude, the incomplete gear 18 meshes with the fixed gear 21. At this time, the fixed gear 21 rotates clockwise, and the piston plate 22 is driven by the screw rod 20 to move in the storage chamber 19 toward the end away from the fixed gear 21, so that the trifluoroiodomethane liquid filled in the storage chamber 19 is sprayed outward. Since the rotation of the screw rod 20 occurs after the main control panel 6 moves a certain distance, the multiple one-way spray holes 23 can spray out the trifluoroiodomethane liquid after the pressure relief groove 5 is opened. Through this sequence, the trifluoroiodomethane liquid will be sprayed out only when the pressure relief starts. Therefore, the problem of the trifluoroiodomethane liquid spraying out when the main control panel 6 is accidentally touched can be avoided. When the staff inspects the cabinet 1, the trifluoroiodomethane liquid spraying out will not cause harm to them due to the accidental touching of the main control panel 6. In addition, the high pressure in the cabinet 1 will not be effectively released, which will cause the trifluoroiodomethane liquid to be difficult to spray out and the spraying coverage to be insufficient due to the influence of the high pressure.

[0045] A cooling cavity 25 is provided in the cabinet 1, a coolant tank 26 is fixedly mounted on the side wall of the cabinet 1, and an inlet pipe 27 is fixedly connected between the bottom of the coolant tank 26 and the bottom of the cooling cavity 25, and a one-way return pipe 28 is fixedly connected between the top of the coolant tank 26 and the top of the cooling cavity 25. The one-way return pipe 28 allows the coolant entering the cooling cavity 25 to smoothly return to the coolant tank 26 when it is full, and the inlet pipe 27 can inject the coolant in the coolant tank 26 into the cooling cavity 25, thereby cooling the cabinet 1. When the pressure in the cabinet 1 increases, it is generally caused by an increase in temperature. Therefore, cooling can effectively prevent the pressure in the cabinet 1 from further increasing, and can also provide heat dissipation protection for internal components.

[0046] A servo motor 29 is fixedly mounted on the side wall of the coolant tank 26, and a lead screw 30 is fixedly connected to the output end of the servo motor 29. One end of the lead screw 30 located in the coolant tank 26 is threadedly connected to a push plate 31 that is sealed and slidably matched with the coolant tank 26. The servo motor 29 is electrically connected to the controller. When the toggle switch 12 is touched, the controller simultaneously sends an electrical signal to the servo motor 29 to make it rotate forward for a certain period of time and then reverse. At this time, the lead screw 30 can drive the push plate 31 to reciprocate in the coolant tank 26, thereby realizing the flow of coolant between the coolant tank 26 and the cooling cavity 25, and after the cooling is completed, the coolant is pumped back from the cooling cavity 25 to the coolant tank 26.

[0047] In the present invention, the working principle of a fixed AC indoor ring main unit is as follows:

[0048] Pressure relief treatment: When the pressure in the cabinet 1 increases, the main control board 6 overcomes the elastic force of the spring 11 under the action of air pressure and moves away from the cabinet door 2. At this time, the push rod 8 and the two L-shaped rods 9 cooperate to make the two sealing plates 4 move in the same direction in the two moving grooves 3, so that the two pressure relief grooves 5 are interconnected with the two moving grooves 3 to perform pressure relief treatment;

[0049] Power off and cooling process: When the main control panel 6 moves a certain distance under the action of air pressure, the trigger rod 13 on the push rod 8 toggles the toggle switch 12. At this time, the controller trips the circuit breaker in the cabinet 1 to achieve power off. At the same time, the controller also allows the servo motor 29 to rotate forward for a certain period of time and then reverse. At this time, the lead screw 30 can drive the push plate 31 to reciprocate in the coolant tank 26 to achieve the flow of coolant between the coolant tank 26 and the cooling cavity 25, and after the temperature is reduced, the coolant is pumped back from the cooling cavity 25 to the coolant tank 26;

[0050] Arc elimination and fire extinguishing: After the main control panel 6 moves a certain distance, the incomplete gear 18 is meshed with the fixed gear 21 by the rotation of the rotating rod 14. At this time, the piston plate 22 is driven by the screw rod 20 to move in the storage chamber 19 toward the end away from the fixed gear 21, so that the trifluoroiodomethane liquid filled in the storage chamber 19 is sprayed outward, and the characteristics of the trifluoroiodomethane liquid are used to eliminate the arc in the cabinet 1, and fire prevention and fire extinguishing treatment is carried out at the same time to reduce the losses caused.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A fixed AC indoor ring main unit, comprising a cabinet door (2) hingedly mounted on a cabinet body (1), characterized in that: Also includes: A pressure relief portion, the pressure relief portion is used to perform pressure relief processing when the pressure in the cabinet (1) increases, the pressure relief portion comprises two movable grooves (3) provided on the inner wall of the cabinet (1), two L-shaped pressure relief grooves (5) are provided on the side wall of the cabinet (1), and the two pressure relief grooves (5) are respectively communicated with the corresponding movable grooves (3), and a blocking component matched with the two movable grooves (3) is installed on the cabinet (1); An arc clearing unit, the arc clearing unit is used to clear the arc when the pressure in the cabinet (1) increases, the arc clearing unit comprises two storage chambers (19) opened in the cabinet (1), and the two storage chambers (19) are filled with trifluoroiodomethane liquid, a plurality of one-way spray holes (23) are opened on the inner wall of the cabinet (1), a delivery pipe (24) is connected between the two storage chambers (19) and the corresponding plurality of one-way spray holes (23), and two pressure applying components matching the corresponding storage chambers (19) are installed in the cabinet (1); A triggering part, the triggering part is used to control the operation of the pressure relief part and the arc clearing part, the triggering part comprises a main control panel (6) slidably mounted in the cabinet (1), and a push rod (8) is fixedly mounted on one end of the main control panel (6) away from the cabinet door (2) through a fixing column (7), the push rod (8) cooperates with the blocking component, and a delay component is installed between the fixing column (7) and the two pressure applying components, the delay component is used to make the arc clearing part operate later than the pressure relief part; The blocking assembly is composed of two sealing plates (4) and two L-shaped rods (9), the two sealing plates (4) are respectively slidably installed in corresponding movable grooves (3) in a sealing manner, and the ends of the two sealing plates (4) away from the cabinet door (2) are respectively fixedly connected to the push rod (8) through the corresponding L-shaped rods (9), and the two L-shaped rods (9) are both slidably connected to the cabinet body (1).

2. A fixed AC indoor ring main unit according to claim 1, characterized in that: The pressure-applying assembly is composed of a screw rod (20) and a piston plate (22); the piston plate (22) is sealingly and slidably mounted in the storage chamber (19); the screw rod (20) is rotatably mounted in the cabinet (1); and one end of the screw rod (20) located in the storage chamber (19) is threadedly connected to the piston plate (22).

3. A fixed AC indoor ring main unit according to claim 2, characterized in that: The delay assembly is composed of a rotating rod (14), a fixed gear ring (15), a fixed rack (16), a slide groove (17), two incomplete gears (18) and two fixed gears (21). The rotating rod (14) is rotatably mounted in the cabinet (1). The fixed gear ring (15) is fixedly mounted at the middle position of the rotating rod (14). The fixed rack (16) is fixedly mounted on the side wall of the fixed column (7), and the fixed rack (16) is meshed with the fixed gear ring (15). The slide groove (17) is opened on the side wall of the cabinet (1), and the slide groove (17) is matched with the fixed rack (16). The two incomplete gears (18) are respectively fixedly mounted on both ends of the rotating rod (14). The two fixed gears (21) are respectively fixedly mounted on the two screw rods (20), and the two fixed gears (21) are respectively matched with the two incomplete gears (18).

4. A fixed AC indoor ring main unit according to claim 1, characterized in that: A sealing groove (10) is provided on the inner wall of the cabinet (1) and is in sealing and sliding cooperation with the main control panel (6), and a spring (11) is installed between the sealing groove (10) and the main control panel (6). A through hole is provided on the side wall of the cabinet (1) and is in communication with the sealing groove (10).

5. The fixed AC indoor ring main unit according to claim 1, characterized in that: A controller is fixedly installed in the cabinet (1), and the controller is electrically connected to a circuit breaker built into the cabinet (1). A toggle switch (12) electrically connected to the controller is installed on the side wall of the cabinet (1), and a trigger rod (13) matching the toggle switch (12) is fixedly installed on the side wall of the push rod (8).

6. A fixed AC indoor ring main unit according to claim 5, characterized in that: A cooling cavity (25) is provided in the cabinet (1), a cooling liquid tank (26) is fixedly mounted on a side wall of the cabinet (1), an inlet pipe (27) is fixedly connected between the bottom of the cooling liquid tank (26) and the bottom of the cooling cavity (25), and a one-way return pipe (28) is fixedly connected between the top of the cooling liquid tank (26) and the top of the cooling cavity (25).

7. A fixed AC indoor ring main unit according to claim 6, characterized in that: A servo motor (29) is fixedly mounted on the side wall of the coolant tank (26), and a lead screw (30) is fixedly connected to the output end of the servo motor (29); one end of the lead screw (30) located in the coolant tank (26) is threadedly connected to a push plate (31) that is sealingly and slidably matched with the coolant tank (26); and the servo motor (29) is electrically connected to a controller.

8. The fixed AC indoor ring main unit according to claim 3, characterized in that: The fixed rack (16) and the fixed gear ring (15) have an equal tooth spacing, and the fixed rack (16) and the fixed gear ring (15) have an equal number of teeth, the tooth spacing of the toothed portion on the incomplete gear (18) is equal to that of the fixed gear (21), and the arc length of the toothed portion on the incomplete gear (18) is greater than the circumference of the fixed gear (21).

Images