A power distribution cabinet with protective effect used in factory areas

Abstract

The present invention relates to the technical field of power distribution cabinets, and in particular to a power distribution cabinet with protective effect used in factory areas, comprising a cabinet body, wherein the upper and lower ends of the cabinet body are respectively fixedly connected with an upper fixed plate and a lower fixed plate, and the bottom of the lower fixed plate is fixedly connected with a base. The present invention provides a reversing valve that can control the flow direction of gas, so that when the heat dissipation of the internal chamber of the cabinet is required, the gas can be controlled to flow only from the top of the piston plate to the bottom of the piston plate, and the hot air inside the cavity is discharged through the up and down movement of the piston plate, and each time the piston plate moves upward, it will also recoil the dust filter block, and when a fire occurs in the cavity or the temperature is high, the gas can be controlled to flow only from the bottom of the piston plate to the top of the piston plate, so that when the piston plate moves upward, part of the air inside the cavity is extracted, so that the air inside the cavity is thin and does not have the conditions for combustion, thereby effectively suppressing the fire and the spread of the fire.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution cabinets, and in particular to a power distribution cabinet with a protective effect used indoors in a factory. Background Art

[0002] In the power distribution system, the distribution cabinet is usually used to centrally control multiple working equipment, which results in a large number of electrical components and complex circuits inside the distribution cabinet. When multiple working equipment are used for a long time, the distribution cabinet will be overloaded, causing the electrical components and cables inside the distribution cabinet to generate a lot of heat, which will cause the temperature inside the distribution cabinet to be too high. Excessive temperature will cause the electrical components or cables inside the distribution cabinet to be burned, and may even cause a fire inside the distribution cabinet, which will bring safety hazards.

[0003] In the prior art, a cooling fan is generally installed inside the distribution cabinet. When the cabinet temperature is high, the cooling fan discharges the hot air inside the distribution cabinet to cool the distribution cabinet. In order to prevent dust from entering, a filter is installed at the air inlet to isolate the dust. However, over a long period of time, the filter will be blocked by dust, affecting the heat dissipation efficiency. Moreover, when a fire occurs inside the distribution cabinet, the circulating wind will accelerate the spread of the fire. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a power distribution cabinet with protective effect for use in factory rooms.

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

[0006] A power distribution cabinet with protective effect used in a factory room, comprising a cabinet body, wherein the upper and lower ends of the cabinet body are respectively fixedly connected with an upper fixing plate and a lower fixing plate, the bottom of the lower fixing plate is fixedly connected with a base, a central tube is arranged in the middle of the cabinet body, the central tube is in the shape of a hollow triangular column, the outer wall of the central tube is fixedly connected to the middle part of the upper fixing plate, the bottom of the central tube is fixedly connected with a lower partition plate, three evenly distributed mounting plates are installed on the outer wall of the central tube, three evenly distributed spacers are fixedly connected to the inner wall of the cabinet body, the three spacers divide the cabinet body and the central tube into three independent chambers, three sealed cabinet doors are installed on the cabinet body, a vertically arranged electric push rod is fixedly connected to the lower partition plate, a plurality of evenly distributed L-shaped holes are opened on the lower partition plate, and the L-shaped holes are used to connect the central On the inner and outer sides of the tube, a piston plate is fixedly connected to the top of the electric push rod, the outer wall of the piston plate is slidably connected to the inner wall of the central tube, and a dust filter block is fixedly installed on the top of the central tube; a joint is fixedly connected to the top of the piston plate, and an elastic plug is installed at the bottom of the dust filter block; an inner cavity connected to the joint is opened inside the piston plate, and three air holes connected to the inner cavity are opened at the bottom of the piston plate, a reversing valve is installed inside the air hole, and three control structures for controlling the unidirectional flow direction of the reversing valve are installed inside the piston plate, an electromagnet group is installed inside the side of the spacer block close to the central tube, a temperature probe for detecting the internal temperature of the chamber is installed on the spacer block, and a plurality of exhaust holes are opened on the upper fixed plate, and a one-way valve for unidirectional exhaust from the chamber to the outside is installed in the exhaust hole.

[0007] Furthermore, the reversing valve includes a hollow plate fixedly connected to the inside of the air vent, and upper and lower sides of the hollow plate are respectively provided with upper sealing blocks and lower sealing blocks that are staggered, and the lower sealing blocks and upper sealing blocks are both adapted to the hollow plate, and the outer walls of the lower sealing blocks and the upper sealing blocks are fixedly connected with connecting columns.

[0008] Furthermore, the control structure includes a movable block made of iron, one side of the movable block is fixedly connected to the ends of two connecting columns, the interior of the piston plate is provided with a movable groove for sliding three movable blocks, and an elastic reset structure is installed on the movable block.

[0009] Furthermore, the elastic reset structure includes a limit block and a tension spring, the limit block is fixedly connected to the movable block, the side of the limit block close to the inner cavity is fixedly connected to the end of the tension spring, three limit grooves are opened inside the piston plate for the limit block to slide, and one end of the tension spring is fixedly connected to the inner wall of the limit groove.

[0010] Furthermore, the elastic plug includes a spring, a baffle is fixedly connected to the lower end of the spring, a plunger is fixedly connected to the bottom of the baffle, a through hole is opened in the middle of the joint, and the plunger is plugged into the through hole.

[0011] Furthermore, a connecting rod is fixedly connected to the middle of the dust filter block, a cover plate is fixedly connected to the top of the connecting rod, a storage tube is fixedly connected to the lower end of the connecting rod, the storage tube is located inside the dust filter block, and the upper end of the spring is fixedly connected to the inside of the storage tube.

[0012] Furthermore, the lower fixed plate is provided with three wire-releasing holes communicated with the chamber, and the inner walls of the wire-releasing holes are fixedly connected with a plurality of funnel-shaped sealing rings.

[0013] Furthermore, the lower sealing block and the upper sealing block are both composed of a substrate, a side of the substrate close to the hollow plate is fixedly connected with an arc-shaped protrusion, the outer side of the arc-shaped protrusion is sleeved with a sealing ring, and the sealing ring is fixedly connected to the end surface of the substrate.

[0014] Furthermore, the outer wall of the lower partition plate is provided with three evenly distributed sliding grooves, the inner wall of the sliding groove is slidably connected with a slider, and one end of the slider is fixedly connected to the outer wall of the mounting plate.

[0015] Compared with the existing technology, the present invention has the following beneficial effects:

[0016] 1. Through the reversing valve, the movable block is pulled by the tension spring when it is not attracted and approaches the inner cavity. At this time, the lower sealing block is connected to the hollow plate, and the upper sealing block is staggered with the hollow plate. At this time, the airflow can only flow from the top of the hollow plate through the gap between the hollow plate and the lower sealing block to the bottom of the hollow plate, and cannot flow from the bottom of the hollow plate to the top of the hollow plate. When the electromagnet group is energized, the movable block will be attracted, so that the tension spring is stretched, and the movable block slides to a position close to the electromagnet group. At this time, the upper sealing block is connected to the hollow plate, and the lower sealing block will be staggered with the hollow plate. At this time, the airflow can only flow from the bottom of the hollow plate to the top of the hollow plate. The cooperation with the piston plate can realize the heat dissipation and fire prevention of the distribution cabinet;

[0017] 2. Through the elastic plug, every time the piston plate moves upward to a certain distance from the dust filter block, the plunger will be inserted into the inside of the through hole to seal it. The piston plate will continue to move upward to compress the spring, and then the gas between the piston plate and the dust filter block will be discharged from the dust filter block, thereby recoil the dust adhering to the dust filter block, avoiding the accumulation of dust on the dust filter block under long-term heat dissipation, so that the dust filter block basically does not require maintenance;

[0018] To summarize, the present invention, through the arrangement of a reversing valve capable of controlling the direction of gas flow, can control the gas to flow only from the top of the piston plate to the bottom of the piston plate when the internal chamber of the cabinet needs to dissipate heat, and discharge the hot air inside the cavity through the up and down movement of the piston plate, and will also recoil the dust filter block each time the piston plate moves upward, and when a fire occurs in the cavity or the temperature is high, the gas can be controlled to flow only from the bottom of the piston plate to the top of the piston plate, so that when the piston plate moves upward, part of the air inside the cavity is extracted, making the air inside the cavity thin and not suitable for combustion, thereby effectively suppressing the ignition and spread of the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of the present invention after the cabinet door is removed;

[0021] Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention;

[0022] Figure 4 The present invention Figure 3 A schematic diagram of the structure enlargement at the center A;

[0023] Figure 5 It is a schematic diagram of the positional relationship between the piston plate and the dust filter block of the present invention;

[0024] Figure 6 is a top view of the piston plate of the present invention;

[0025] Figure 7 The present invention Figure 6 Sectional view along the CC line;

[0026] Figure 8 The present invention Figure 7 A schematic diagram of the structure enlarged at B in the middle;

[0027] Fig. 9 It is a schematic diagram of the cross-sectional structure of the sealing ring of the present invention.

[0028] In the figure: 1, cabinet; 2, center tube; 3, spacer; 4, lower partition; 5, lower fixed plate; 6, base; 7, mounting plate; 8, electric push rod; 9, piston plate; 10, dust filter block; 11, connector; 12, electromagnet group; 13, temperature probe; 14, elastic plug; 15, upper fixed plate; 16, one-way valve; 17, sealed cabinet door; 18, exhaust hole; 19, through hole; 20, inner cavity; 21, movable groove; 22, movable block; 23. Connecting column; 24. Air vent; 25. Lower sealing block; 26. Upper sealing block; 27. Hollow plate; 28. Limiting groove; 29. ​​Limiting block; 30. Tension spring; 31. L-shaped hole; 32. Slide groove; 33. Slider; 34. Connecting rod; 35. Cover plate; 36. Storage tube; 37. Spring; 38. Plunger; 39. Baffle; 40. Base plate; 41. Arc-shaped protrusion; 42. Sealing ring; 43. Wire release hole; 44. Sealing ring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0031] Reference Figure 1-Figure 9A power distribution cabinet with protective effect used in a factory room comprises a cabinet body 1, an upper fixing plate 15 and a lower fixing plate 5 are fixedly connected to the upper and lower ends of the cabinet body 1 respectively, a base 6 is fixedly connected to the bottom of the lower fixing plate 5, a central tube 2 is arranged in the middle of the cabinet body 1, the central tube 2 is a hollow triangular column, the outer wall of the central tube 2 is fixedly connected to the middle of the upper fixing plate 15, a lower partition 4 is fixedly connected to the bottom of the central tube 2, three evenly distributed mounting plates 7 are installed on the outer wall of the central tube 2, and three mounting plates 7 are fixedly connected to the inner wall of the cabinet body 1. The cabinet body 1 and the central tube 2 are divided into three independent chambers by three evenly distributed spacers 3. Three sealed cabinet doors 17 are installed on the cabinet body 1. A vertically arranged electric push rod 8 is fixedly connected to the lower partition 4. A plurality of evenly distributed L-shaped holes 31 are opened on the lower partition 4. The L-shaped holes 31 are used to connect the inner and outer sides of the central tube 2. A piston plate 9 is fixedly connected to the top of the electric push rod 8. The outer wall of the piston plate 9 is slidably connected to the inner wall of the central tube 2. A dust filter block 10 is fixedly installed on the top of the central tube 2. The lower fixed plate 5 is provided with three wire-releasing holes 43 connected to the chamber, and the inner wall of the wire-releasing hole 43 is fixedly connected with a plurality of funnel-shaped sealing rings 44, and the sealing rings 44 are used to ensure the sealing between the incoming wire and the wire-releasing hole 43. When the inside of the chamber is in a negative pressure state, the external air cannot enter the chamber from the wire-releasing hole 43; the top of the piston plate 9 is fixedly connected with a joint 11, and the bottom of the dust filter block 10 is installed with an elastic plug 14. The interior of the piston plate 9 is provided with an inner cavity 20 connected with the joint 11, and the bottom of the piston plate 9 is provided with three An air vent 24 is connected to the interior of the inner cavity 20, and a reversing valve is installed inside the air vent 24. Three control structures for controlling the one-way flow direction of the reversing valve are installed inside the piston plate 9. An electromagnet group 12 is installed inside the side of the spacer block 3 close to the central tube 2. A temperature probe 13 for detecting the internal temperature of the chamber is installed on the spacer block 3. A plurality of exhaust holes 18 are opened on the upper fixed plate 15. A one-way valve 16 for one-way exhaust from the chamber to the outside is installed in the exhaust hole 18. The one-way valve 16 is a valve plate hinged on the exhaust hole 18.

[0032] When in use, the built-in components of the power distribution cabinet are installed on the mounting plate 7. The three independent chambers can be used to install and manage components in different areas or with different functions. Each group of components is relatively independent to avoid heat accumulation and prevent the failure of a single group of components from affecting other components. The central tube 2 set in the middle can dissipate heat for multiple groups of components at the same time. During heat dissipation, the reversing valve inside the piston plate 9 controls the airflow to flow only from the top to the bottom of the piston plate 9. Under the extension and retraction of the electric push rod 8, the piston plate 9 is driven to move up and down inside the central tube 2. When the piston plate 9 moves downward, the external cold air is sucked in from the top of the central tube 2. The air is filtered out of dust by the dust filter block 10 and enters between the dust filter block 10 and the piston plate 9. The air at the bottom of the piston plate 9 passes through the L-shaped hole 31 and is pressed into the interior of the three cavities. The hot air inside the cavity is discharged from the exhaust hole 18. Since the cold air enters from the bottom of the cavity and is discharged from the exhaust hole 18 at the top, the heat dissipation effect on the cavity is more sufficient. When the piston plate 9 moves upward, the air is Due to the sealing of the one-way valve 16 and the wire-releasing hole 43, the cold air on the top of the piston plate 9 will pass through the reversing valve and enter the bottom of the piston plate 9, and when the piston plate 9 is close to the dust filter block 10, the elastic plug 14 will block the joint 11, and the piston plate 9 will continue to move upward, which will cause the gas on the top of the piston plate 9 to pass through the dust filter block 10 and be discharged, thereby recoil the dust adhering to the dust filter block 10, avoiding the accumulation of dust on the dust filter block 10 under long-term heat dissipation, and basically no maintenance is required. Moreover, when the temperature probe 13 detects that the temperature inside the cavity is too high and a fire may occur, the electromagnet group 12 will be energized to trigger the control structure, and the reversing valve will be controlled by the control structure, so that the airflow can only flow from the bottom of the piston plate 9 to the top. At this time, the electric push rod 8 will continue to extend after shortening. When the piston plate 9 moves upward, part of the air inside the cavity will be extracted, making the air inside the cavity thin and not having the conditions for combustion, thereby effectively suppressing the ignition and the spread of the fire.

[0033] In order to control the flow direction of the airflow, the present invention adopts the following technical scheme: the reversing valve includes a hollow plate 27 fixedly connected to the inside of the air vent 24; upper and lower sides of the hollow plate 27 are respectively provided with staggered upper sealing blocks 26 and lower sealing blocks 25; the lower sealing blocks 25 and the upper sealing blocks 26 are both adapted to the hollow plate 27; the outer walls of the lower sealing blocks 25 and the upper sealing blocks 26 are both fixedly connected with connecting columns 23; the control structure includes a movable block 22, the material of the movable block 22 is iron, one side of the movable block 22 is fixedly connected to the ends of the two connecting columns 23; the interior of the piston plate 9 is provided with movable grooves 21 for sliding of the three movable blocks 22; An elastic reset structure is installed on the movable block 22. When the movable block 22 moves, it will drive the lower sealing block 25 and the upper sealing block 26 to move synchronously. When the lower sealing block 25 moves to dock with the hollow plate 27, the upper sealing block 26 is staggered with the hollow plate 27. At this time, the airflow can only flow from the top of the hollow plate 27 through the gap between the hollow plate 27 and the lower sealing block 25 to the bottom of the hollow plate 27, and cannot flow from the bottom of the hollow plate 27 to the top of the hollow plate 27. When the upper sealing block 26 is docked with the hollow plate 27, the lower sealing block 25 will be staggered with the hollow plate 27. At this time, the airflow can only flow from the bottom of the hollow plate 27 to the top of the hollow plate 27.

[0034] In order to control the position of the movable block 22, the present invention adopts the following technical scheme, the elastic reset structure includes a limit block 29 and a tension spring 30, the limit block 29 is fixedly connected to the movable block 22, the side of the limit block 29 close to the inner cavity 20 is fixedly connected to the end of the tension spring 30, the interior of the piston plate 9 is provided with three limit grooves 28 for the limit block 29 to slide, one end of the tension spring 30 is fixedly connected to the inner wall of the limit groove 28, the setting of the elastic reset structure allows the movable block 22 to be pulled by the tension spring 30 and approach the inner cavity 20 when it is not attracted, at this time the lower sealing block 25 is connected to the hollow plate 27, when the electromagnet group 12 is energized, it will attract the movable block 22, so that the tension spring 30 is stretched, and the movable block 22 slides to a position close to the electromagnet group 12, at this time the upper sealing block 26 is connected to the hollow plate 27.

[0035] In order to achieve the recoil of the dust filter block 10, the present invention adopts the following technical scheme: the elastic plug 14 includes a spring 37, and the lower end of the spring 37 is fixedly connected to a baffle 39, which serves as an auxiliary seal. The bottom of the baffle 39 is fixedly connected to a plunger 38, and a through hole 19 is opened in the middle of the joint 11. The plunger 38 is plugged into the through hole 19. Each time the piston plate 9 moves upward to a certain distance from the dust filter block 10, the plunger 38 will be inserted into the inside of the through hole 19 and sealed. The piston plate 9 continues to move upward to compress the spring 37, and then the gas between the piston plate 9 and the dust filter block 10 will be discharged from passing through the dust filter block 10.

[0036] In order to facilitate the storage of the spring 37, the present invention adopts the following technical solution: a connecting rod 34 is fixedly connected to the middle of the dust filter block 10, a cover plate 35 is fixedly connected to the top of the connecting rod 34, and a storage tube 36 is fixedly connected to the lower end of the connecting rod 34. The storage tube 36 is located inside the dust filter block 10, and the upper end of the spring 37 is fixedly connected to the inside of the storage tube 36, so that the spring 37 can be stored in the inside of the storage tube 36 when it contracts.

[0037] In order to achieve a better sealing effect, the present invention adopts the following technical solution: the lower sealing block 25 and the upper sealing block 26 are both composed of a substrate 40, and an arc-shaped protrusion 41 is fixedly connected to the side of the substrate 40 close to the hollow plate 27. A sealing ring 42 is sleeved on the outer side of the arc-shaped protrusion 41, and the sealing ring 42 is fixedly connected to the end face of the substrate 40. There is a linear seal between the arc-shaped protrusion 41 and the hollow plate 27, and the sealing effect is better. The setting of the sealing ring 42 can assist in sealing.

[0038] In order to facilitate the installation of components on the mounting plate 7, the present invention adopts the following technical solution: three evenly distributed slide grooves 32 are opened on the outer wall of the lower partition 4, and a slider 33 is slidably connected to the inner wall of the slide groove 32. One end of the slider 33 is fixedly connected to the outer wall of the mounting plate 7. When installing components, the mounting plate 7 can be pulled outward.

[0039] Working principle: When the movable block 22 is not attracted, it is pulled by the tension spring 30 and approaches the inner cavity 20. At this time, the lower sealing block 25 is connected to the hollow plate 27. When the electromagnet group 12 is energized, the movable block 22 will be attracted, so that the tension spring 30 is stretched, and the movable block 22 slides to a position close to the electromagnet group 12. At this time, the upper sealing block 26 is connected to the hollow plate 27. When the heat is normally dissipated, the reversing valve inside the piston plate 9 controls the airflow to flow only from the top of the piston plate 9 to the bottom. Under the extension and retraction of the electric push rod 8, the piston plate 9 is driven to the center. The interior of the central tube 2 moves up and down. When the piston plate 9 moves downward, the external cold air is sucked in from the top of the central tube 2. The air is filtered by the dust filter block 10 to remove dust, and enters between the dust filter block 10 and the piston plate 9. The air at the bottom of the piston plate 9 passes through the L-shaped hole 31 and is pressed into the interior of the three cavities. The hot air inside the cavity is discharged from the exhaust hole 18. Since the cold air enters from the bottom of the cavity and is discharged from the exhaust hole 18 at the top, the heat dissipation effect on the cavity is more sufficient. When the piston plate 9 moves upward, due to the one-way valve 16 and the wire release hole 43, the The seal will cause the cold air on the top of the piston plate 9 to pass through the reversing valve and enter the bottom of the piston plate 9. When the piston plate 9 is close to the dust filter block 10, the elastic plug 14 will block the joint 11. The piston plate 9 continues to move upward, which will cause the gas on the top of the piston plate 9 to pass through the dust filter block 10 and be discharged, thereby recoil the dust adhering to the dust filter block 10, avoiding the accumulation of dust on the dust filter block 10 under long-term heat dissipation. Basically, no maintenance is required, and when the temperature probe 13 detects that the temperature inside the cavity is too high and a fire may occur, the electromagnet group will be controlled 12 is energized, so that the electromagnet group 12 triggers the control structure, and the reversing valve is controlled by the control structure, so that when the upper sealing block 26 inside the reversing valve is connected with the hollow plate 27, the lower sealing block 25 will be staggered with the hollow plate 27, so that the air flow can only flow from the bottom to the top of the piston plate 9. At this time, the electric push rod 8 continues to extend after completing the shortening operation. When the piston plate 9 moves upward, part of the air inside the cavity will be extracted, making the air inside the cavity thin and not suitable for combustion, thereby effectively suppressing the ignition and the spread of the fire.

[0040] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A power distribution cabinet with protective effect for use in a factory room, comprising a cabinet body (1), wherein the upper and lower ends of the cabinet body (1) are respectively fixedly connected to an upper fixing plate (15) and a lower fixing plate (5), and the bottom of the lower fixing plate (5) is fixedly connected to a base (6), characterized in that: A central tube (2) is provided in the middle of the cabinet (1), the central tube (2) being in the shape of a hollow triangular column, the outer wall of the central tube (2) being fixedly connected to the middle of the upper fixing plate (15), the bottom of the central tube (2) being fixedly connected to a lower partition plate (4), the outer wall of the central tube (2) being mounted with three evenly distributed mounting plates (7), the inner wall of the cabinet (1) being fixedly connected with three evenly distributed spacers (3), the three spacers (3) dividing the cabinet (1) and the central tube (2) into three independent chambers The cabinet body (1) is provided with three sealed cabinet doors (17); a vertically arranged electric push rod (8) is fixedly connected to the lower partition (4); a plurality of evenly distributed L-shaped holes (31) are provided on the lower partition (4); the L-shaped holes (31) are used to connect the central tube (2) and the independent chamber; a piston plate (9) is fixedly connected to the top of the electric push rod (8); the outer wall of the piston plate (9) is slidably connected to the inner wall of the central tube (2); and a dust filter block (10) is fixedly installed on the top of the central tube (2); A joint (11) is fixedly connected to the top of the piston plate (9), and the joint (11) is connected to the central tube (2). External air enters the central tube (2) through the dust filter block (10). An elastic plug (14) is installed at the bottom of the dust filter block (10). When the piston plate (9) is close to the dust filter block (10), the elastic plug (14) blocks the joint (11). An inner cavity (20) connected to the joint (11) is provided inside the piston plate (9). Three air holes (24) connected to the inner cavity (20) are provided at the bottom of the piston plate (9). The three air holes (24) are respectively connected to three independent chambers. A reversing valve is installed inside the air hole (24). The piston plate (9) ) are internally installed with three control structures for controlling the one-way flow direction of the reversing valve. During normal heat dissipation, the reversing valve inside the piston plate (9) controls the airflow to flow only from the top to the bottom of the piston plate (9). An electromagnet group (12) is installed inside the side of the spacer (3) close to the central tube (2). A temperature probe (13) for detecting the temperature inside the chamber is installed on the spacer (3). When the temperature probe (13) detects that the temperature inside the chamber is too high, the electromagnet group (12) will be controlled to be energized. A plurality of exhaust holes (18) are opened on the upper fixed plate (15). The exhaust holes (18) are respectively located on the upper sides of the three independent chambers. A one-way valve (16) for exhausting air from the chamber to the outside is installed in the exhaust hole (18).

2. According to claim 1, a power distribution cabinet with protective effect used in a factory room is characterized in that: The reversing valve comprises a hollow plate (27) fixedly connected to the inside of the air vent (24), and upper and lower sides of the hollow plate (27) are respectively provided with staggered upper sealing blocks (26) and lower sealing blocks (25), and the lower sealing blocks (25) and the upper sealing blocks (26) are both adapted to the hollow plate (27). When the lower sealing block (25) moves to butt with the hollow plate (27), the upper sealing block (26) is staggered with the hollow plate (27), so that airflow can only flow from the hollow plate (27). The top of the hollow plate (27) passes through the gap between the hollow plate (27) and the lower sealing block (25) and flows to the bottom of the hollow plate (27). When the upper sealing block (26) is connected to the hollow plate (27), the lower sealing block (25) will be staggered with the hollow plate (27). At this time, the airflow can only flow from the bottom of the hollow plate (27) to the top of the hollow plate (27). The outer walls of the lower sealing block (25) and the upper sealing block (26) are fixedly connected with connecting columns (23).

3. According to claim 2, a power distribution cabinet with protective effect used in a factory room is characterized in that: The control structure comprises a movable block (22), the movable block (22) being made of iron. When the electromagnet group (12) is energized, the movable block (22) is attracted, so that the tension spring (30) is stretched and the movable block (22) slides to a position close to the electromagnet group (12). At this time, the upper sealing block (26) is in contact with the hollow plate (27), one side of the movable block (22) is fixedly connected to the ends of two connecting columns (23), and a movable groove (21) for sliding three movable blocks (22) is provided inside the piston plate (9), and an elastic reset structure is installed on the movable block (22).

4. The power distribution cabinet with protective effect used in a factory room according to claim 3 is characterized in that: The elastic reset structure comprises a limit block (29) and a tension spring (30); the limit block (29) is fixedly connected to the movable block (22); a side of the limit block (29) close to the inner cavity (20) is fixedly connected to an end of the tension spring (30); three limit grooves (28) for the limit block (29) to slide are provided inside the piston plate (9); and one end of the tension spring (30) is fixedly connected to an inner wall of the limit groove (28).

5. The power distribution cabinet with protective effect used in a factory room according to claim 1, characterized in that: The elastic plug (14) comprises a spring (37), the lower end of the spring (37) is fixedly connected to a baffle (39), the bottom of the baffle (39) is fixedly connected to a plunger (38), a through hole (19) is provided in the middle of the joint (11), and the plunger (38) is plugged into the through hole (19).

6. The power distribution cabinet with protective effect used in a factory room according to claim 5, characterized in that: A connecting rod (34) is fixedly connected to the middle of the dust filter block (10), a cover plate (35) is fixedly connected to the top of the connecting rod (34), a storage tube (36) is fixedly connected to the lower end of the connecting rod (34), the storage tube (36) is located inside the dust filter block (10), and the upper end of the spring (37) is fixedly connected to the inside of the storage tube (36).

7. The power distribution cabinet with protective effect used in a factory room according to claim 1, characterized in that: The lower fixed plate (5) is provided with three wire-releasing holes (43) in communication with the chamber, and the inner walls of the wire-releasing holes (43) are fixedly connected with a plurality of funnel-shaped sealing rings (44).

8. The power distribution cabinet with protective effect used in a factory room according to claim 2, characterized in that: The lower sealing block (25) and the upper sealing block (26) are both composed of a base plate (40), and a curved protrusion (41) is fixedly connected to a side of the base plate (40) close to the hollow plate (27), and a sealing ring (42) is sleeved on the outer side of the curved protrusion (41), and the sealing ring (42) is fixedly connected to the end surface of the base plate (40).

9. The power distribution cabinet with protective effect used in a factory room according to claim 1, characterized in that: The outer wall of the lower partition plate (4) is provided with three evenly distributed sliding grooves (32), the inner wall of the sliding groove (32) is slidably connected with a slider (33), and one end of the slider (33) is fixedly connected to the outer wall of the mounting plate (7).

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