Dual-power-supply automatic switching distribution box

Abstract

The invention discloses a dual power supply automatic switching distribution box, and relates to the technical field of power distribution equipment, the dual power supply automatic switching distribution box comprises a box body, a common power supply loop ammeter and a standby power supply loop ammeter, the common power supply loop ammeter and the standby power supply loop ammeter are symmetrically distributed in the box body, and a power supply controller is arranged between the common power supply loop ammeter and the standby power supply loop ammeter. The frequently-used power supply loop ampere meter, the standby power supply loop ampere meter and the power supply controller are all mounted on the front surface of a back plate, the back plate is erected in the box body, and the back of the back plate is provided with a first-class heat dissipation mechanism for providing gas refrigeration; a second-class heat dissipation mechanism for providing liquid refrigeration is arranged in the first-class heat dissipation mechanism; and a control mechanism for switching refrigeration modes is arranged between the first-class heat dissipation mechanism and the second-class heat dissipation mechanism. The dual-power-supply automatic switching distribution box disclosed by the invention has the effects of intelligent operation and high working efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution equipment, in particular to a dual power automatic switching distribution box. BACKGROUND

[0002] The dual power transfer switch distribution box (ATS distribution box) is an electrical equipment with automatic switching function of main and standby power supply, which is widely used in places with high requirements for power supply continuity, such as fire control room, hospital operating room, data center, etc. It usually contains two independent power input terminals (main power and standby power), an automatic controller and a switching execution mechanism. When the main power fails or the voltage drops, the controller will automatically switch the load to the standby power supply to ensure continuous operation of the equipment.

[0003] The existing dual power automatic switching distribution box (ATS) adopts overall ventilation or natural convection cooling mode when running in outdoor high temperature environment or under large current load, which cannot concentrate cooling on high heating parts, resulting in local high temperature. Due to the single cooling mode, the distribution box cannot intelligently and reasonably switch the cooling mode, which has functional deficiency and operation short board. SUMMARY

[0004] The present application discloses a dual power automatic switching distribution box, which aims to solve the technical problem of functional short board of the existing dual power automatic switching distribution box in actual operation.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: A dual power automatic switching distribution box, comprising a box body, a commonly used power supply circuit ammeter and a standby power supply circuit ammeter symmetrically distributed in the interior of the box body, a power supply controller is arranged between the commonly used power supply circuit ammeter and the standby power supply circuit ammeter, the commonly used power supply circuit ammeter, the standby power supply circuit ammeter and the power supply controller are all installed on the front surface of the back plate, the back plate is erected in the interior of the box body, a kind of heat dissipation mechanism for providing gas refrigeration is arranged on the back of the back plate, the kind of heat dissipation mechanism comprises two bellows fixedly installed on the back of the back plate, a plurality of air blowing rows are arranged on the side surface of the bellows, and the bottoms of the two bellows are connected to a tee pipe; A second kind of heat dissipation mechanism for providing liquid refrigeration is arranged in the interior of the kind of heat dissipation mechanism, the second kind of heat dissipation mechanism comprises a flow guide straight pipe installed through the interior of the box body, a flow guide cavity is fixedly installed in the middle of the back of the back plate, and flow guide coil pipes are symmetrically installed at both ends of the flow guide cavity; The control mechanism for switching the refrigeration mode is arranged between the first heat dissipation mechanism and the second heat dissipation mechanism, and the control mechanism comprises a sliding chamber arranged at the end of each guide disc pipe. Through the operation of the first heat dissipation mechanism, the second heat dissipation mechanism and the control mechanism, the current table area of the normal power supply circuit and the current table area of the standby power supply circuit can be intelligently and efficiently cooled.

[0006] Based on the existing heat dissipation mode of the dual power automatic switching distribution box, the first heat dissipation mechanism and the second heat dissipation mechanism controlled by the control mechanism are arranged. Firstly, the current table area of the normal power supply circuit and the current table area of the standby power supply circuit are divided into two modules through modular processing. Through the automatic swing of the power controller, when the internal circuit components of which area are running, the first heat dissipation mechanism and the second heat dissipation mechanism at the back of which area are running. Different from the traditional distribution box whole ventilation or natural convection cooling mode, the device can concentrate cooling on the high heat generating parts, thereby greatly improving the heat dissipation efficiency of the internal distribution box. At the same time, the control mechanism built in the device can be driven by hydraulic strength, thereby driving the first heat dissipation mechanism and the second heat dissipation mechanism to realize multiple working modes.

[0007] In a preferred scheme, two said air boxes are symmetrically distributed at the back of said normal power supply circuit current table and said standby power supply circuit current table, said air blowing rows are distributed at the back of said normal power supply circuit current table and said standby power supply circuit current table, said three-way pipe is installed inside said box, a fan is installed through the outside of said box, and said fan is horizontally distributed at the side of said three-way pipe.

[0008] Through modular processing, the current table area of the normal power supply circuit and the current table area of the standby power supply circuit are arranged as two modules. Air is introduced into the three-way pipe by the fan, and the air blowing row connected by the air box directly air-cools and blows the current table area of the normal power supply circuit and the current table area of the standby power supply circuit, thereby replacing the traditional distribution box whole ventilation or natural convection cooling mode, and greatly improving the heat dissipation efficiency.

[0009] In a preferred scheme, the guide straight pipe and the guide cavity are connected through, the back of the power controller is provided with a wheel disc, the wheel disc is distributed in the guide cavity, and each guide disc pipe is correspondingly installed in the inside of the air box and penetrates out from the back of the box.

[0010] By modular processing, the intervals where the normal power circuit ammeter and the standby power circuit ammeter are located are divided into two modules, the automatic swing of the power controller is used to drive the disc inside the flow guide cavity to rotate synchronously, when the internal circuit components of which interval are running, the back flow guide disc pipe of which interval is connected to liquid cooling, and specified cooling is realized, which is different from the traditional distribution box whole ventilation or natural convection cooling mode, the device can concentrate cooling on high heat parts, and the heat dissipation efficiency inside the distribution box is greatly improved.

[0011] In a preferred scheme, the piston pieces are vertically distributed at the end of the three-way pipe, and a shunt cavity is formed in the interior of the piston piece.

[0012] By additionally setting a control mechanism driven by liquid pressure intensity between the wind box and the flow guide disc pipe, a variety of working modes are realized by the control mechanism driving a kind of heat dissipation mechanism and a second kind of heat dissipation mechanism; in the normal state, the piston piece not driven by liquid pressure is distributed in the interior of the sliding chamber, and the piston piece driven by liquid pressure moves vertically and blocks the three-way pipe at the corresponding position, so that liquid cooling acts on the running electrical element interval, air cooling acts on the standby electrical element interval, the liquid cooling efficiency is greater than the air cooling, and reasonable distribution is realized; when the temperature of the running electrical element exceeds the set threshold, the piston piece is further pushed out by the continuous increase of the liquid pressure in the flow guide disc pipe at this time, so that the shunt cavity connects the three-way pipe and the wind box, so that air cooling and liquid cooling are concentrated on the high temperature area, and intelligent distribution is realized.

[0013] As can be seen from the above, the dual power automatic switching distribution box provided by the application has the following technical effects.

[0014] Firstly, by modular processing, the intervals where the normal power circuit ammeter and the standby power circuit ammeter are located are set as two modules, air is directly introduced into the interior of the three-way pipe and the wind box by the fan, and the air blowing is directly air-cooled to the intervals where the normal power circuit ammeter and the standby power circuit ammeter are located, so as to replace the traditional distribution box whole ventilation or natural convection cooling mode, and the heat dissipation efficiency is greatly improved.

[0015] Secondly, by modular processing, the automatic swing of the power controller is used to drive the disc inside the flow guide cavity to rotate synchronously, when the internal circuit components of which interval are running, the back flow guide disc pipe of which interval is connected to liquid cooling, and specified cooling is realized, which can concentrate cooling on high heat parts, and further improve the heat dissipation efficiency inside the distribution box on the basis of air cooling.

[0016] Third: by setting the additional control mechanism driven by the liquid pressure intensity between the wind box and the guide disc tube, under normal circumstances, the initial position of the piston is used to realize the liquid cooling effect on the running electrical element interval, and the air cooling effect on the standby electrical element interval, realizing the rationalization of distribution processing; when the temperature of the running electrical element exceeds the set threshold value, at this time, the further displacement of the piston is used, so as to concentrate the air cooling and liquid cooling on the high temperature area, realize the intelligent distribution, and greatly improve the operation efficiency of the traditional distribution box. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The first perspective structure diagram of the application is provided.

[0018] Figure 2 The internal structure of the device is provided.

[0019] Figure 3 The second perspective structure diagram of the application is provided.

[0020] Figure 4 The second perspective structure of the device is provided.

[0021] Figure 5 The device wind box structure explosion diagram is provided.

[0022] Figure 6 The wind box structure section view is provided.

[0023] Figure 7 The initial state structure diagram of the piston is provided.

[0024] Figure 8 The Figure 7 The enlarged structure diagram of A in the application is provided.

[0025] Figure 9 The structure diagram of the shunt cavity and the branch channel is provided.

[0026] Figure 10 The structure diagram of the Figure 9 The structure diagram of B in the application is provided.

[0027] Figure 11 The structure diagram of the shunt cavity and the branch channel is provided.

[0028] Figure 12 The structure diagram of the Figure 11 The structure diagram of C in the application is provided.

[0029] In the figure: 1, box body; 2, normal power supply circuit ammeter; 3, standby power supply circuit ammeter; 4, power supply controller; 5, back plate; 6, a kind of heat dissipation mechanism; 601, wind box; 602, air blowing row; 603, three-way pipe; 604, through hole; 605, fan; 606, branch channel; 7, second heat dissipation mechanism; 701, flow guide straight pipe; 702, flow guide cavity; 703, wheel disc part; 704, flow guide disc pipe; 8, control mechanism; 801, sliding bin; 802, piston part; 803, flow distribution cavity; 804, elastic sheet; 805, positioning bead; 9, lifting ring; 10, heat dissipation window; 11, rainproof baffle. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0031] The disclosed double power supply automatic switching distribution box is mainly applied to the scene of precise temperature control of a double power supply distribution box.

[0032] REFERENCE Figures 1 to 12 A double power supply automatic switching distribution box, comprising a box body 1, a normal power supply circuit ammeter 2 and a standby power supply circuit ammeter 3 symmetrically distributed in the inside of the box body 1, a power supply controller 4 arranged between the normal power supply circuit ammeter 2 and the standby power supply circuit ammeter 3, the normal power supply circuit ammeter 2, the standby power supply circuit ammeter 3 and the power supply controller 4 all being installed on the front face of a back plate 5, the back plate 5 being erected in the inside of the box body 1, the back part of the back plate 5 being provided with a first heat dissipation mechanism 6 for providing gas refrigeration, the first heat dissipation mechanism 6 comprising two wind boxes 601 fixedly installed on the back part of the back plate 5, a plurality of air blowing rows 602 being through-opened on the side face of each wind box 601, and the bottoms of the two wind boxes 601 being commonly and through-connected to a three-way pipe 603; The inside of the first heat dissipation mechanism 6 is provided with a second heat dissipation mechanism 7 for providing liquid refrigeration, the second heat dissipation mechanism 7 comprising a flow guide straight pipe 701 through-installed in the inside of the box body 1, a flow guide cavity 702 fixedly installed in the middle of the back part of the back plate 5, and flow guide disc pipes 704 symmetrically installed at the two ends of the flow guide cavity 702; The first heat dissipation mechanism 6 and the second heat dissipation mechanism 7 are provided with a control mechanism 8 for switching refrigeration modes, the control mechanism 8 comprising a sliding bin 801 arranged at the end of each flow guide disc pipe 704, and a piston part 802 slidingly installed in the inside of the sliding bin 801; Through the cooperation of the first heat dissipation mechanism 6, the second heat dissipation mechanism 7 and the control mechanism 8, intelligent and efficient heat dissipation is realized for the area where the normal power supply circuit ammeter 2 and the standby power supply circuit ammeter 3 are located.

[0033] In this embodiment: under normal circumstances, the circuit in the interval where the power controller 4 and the commonly used power loop ammeter 2 are located is turned on, at this time, under the cooperative control of the power controller 4, the second type of heat dissipation mechanism 7 liquid cooling acts on the interval where the commonly used power loop ammeter 2 is located, and the first type of heat dissipation mechanism 6 air cooling acts on the interval where the standby power loop ammeter 3 is located, and similarly, when the power controller 4 switches the circuit to be turned on to the interval where the standby power loop ammeter 3 is located, at this time, the second type of heat dissipation mechanism 7 liquid cooling acts on the interval where the standby power loop ammeter 3 is located, and the first type of heat dissipation mechanism 6 air cooling acts on the interval where the commonly used power loop ammeter 2 is located, so that the first type of heat dissipation mechanism 6 and the second type of heat dissipation mechanism 7 operate alternately; taking the interval where the commonly used power loop ammeter 2 is located as an example, when the temperature of the interval where the commonly used power loop ammeter 2 is located is greater than the set temperature threshold, at this time, the second type of heat dissipation mechanism 7 increases the liquid cooling hydraulic pressure, so that the control mechanism 8 drives the first type of heat dissipation mechanism 6 to act on the interval where the commonly used power loop ammeter 2 is located, and then simultaneously performs liquid cooling and air cooling double cooling on the interval where the commonly used power loop ammeter 2 is located.

[0034] Among them, the top of the box body 1 is symmetrically provided with a group of lifting rings 9 for crane traction, which facilitates the crane to carry the box body 1, and the bottom of the box body 1 is provided with a heat dissipation window 10, which penetrates to the inside of the box body 1, for self-heat dissipation of the box body 1, and the two sides of the box body 1 are symmetrically provided with rainproof baffles 11, which are connected with the inside of the box body 1, facilitating installation workers to connect lines inside the box body 1.

[0035] Referring to Figures 1 to 2 , Figures 4 to 10 In a preferred embodiment, two air boxes 601 are symmetrically distributed on the back of the commonly used power loop ammeter 2 and the standby power loop ammeter 3, the air blowing row 602 is distributed on the back of the commonly used power loop ammeter 2 and the standby power loop ammeter 3, the three-way pipe 603 is installed inside the box body 1, and a fan 605 is installed on the outside of the box body 1, which is horizontally distributed on the side of the three-way pipe 603.

[0036] When the whole device is running, the fan 605 located at the back of the box body 1 rotates synchronously, introducing air from the outside of the box body 1 into the inside of the box body 1, the air entering the inside of the box body 1 will pass through the three-way pipe 603 into the inside of the air box 601 at the back of the back plate 5, and blow out from the air blowing row 602, thereby cooling the commonly used power loop ammeter 2 and the standby power loop ammeter 3.

[0037] Among them, the bottom side of the three-way pipe 603 is provided with a through port 604, and the through port 604 and the fan 605 are symmetrically distributed along the horizontal direction, and air is introduced into the inside of the three-way pipe 603 through the through port 604.

[0038] Referring to Figures 3 to 10In a preferred embodiment, the flow guide straight pipe 701 and the flow guide cavity 702 are connected through, the back of the power supply controller 4 is provided with a wheel disc 703, the wheel disc 703 is distributed in the inside of the flow guide cavity 702, and each flow guide disc pipe 704 is correspondingly installed in the inside of a wind box 601 and penetrates through the back of the box 1.

[0039] The back of the power supply controller 4 is provided with a wheel disc 703, the wheel disc 703 rotates coaxially with the pointer of the power supply controller 4, and the interval in which the commonly used power supply loop ammeter 2 is located is taken as an example. When the power supply controller 4 points to the commonly used power supply loop ammeter 2, the electrical element located in the interval in which the commonly used power supply loop ammeter 2 is located starts to operate, at the same time, the wheel disc 703 turns to the flow guide disc pipe 704 at the back of the interval in which the commonly used power supply loop ammeter 2 is located, so that the flow guide disc pipe 704, the flow guide cavity 702 and the flow guide straight pipe 701 are connected. At this time, the liquid cooling pump connected to the outside of the flow guide straight pipe 701 will guide the cooling liquid into the inside of the flow guide disc pipe 704, so as to carry out liquid cooling for the interval in which the commonly used power supply loop ammeter 2 is located. The inlet of the flow guide straight pipe 701 and the outlet of the flow guide disc pipe 704 are connected to the circulating liquid cooling device.

[0040] Referring to Figures 7 to 10 In a preferred embodiment, the piston 802 is vertically distributed at the end of the three-way pipe 603, the inside of the piston 802 is provided with a shunt cavity 803, the shunt cavity 803 is shielded by the sliding bin 801, and the three-way pipe 603 is provided with a branch channel 606 at the top side.

[0041] Under normal circumstances, the piston 802 is hidden in the inside of the sliding bin 801, at this time, the three-way pipe 603 is directly connected to the wind box 601. The interval in which the commonly used power supply loop ammeter 2 is located is taken as an example. When the cooling liquid flows in the inside of the flow guide disc pipe 704 at the back of the interval in which the commonly used power supply loop ammeter 2 is located, the piston 802 in the inside of the flow guide disc pipe 704 will be pushed by the hydraulic pressure, so as to move towards the three-way pipe 603, until the branch channel 606 of the three-way pipe 603 is blocked. At this time, the interval in which the commonly used power supply loop ammeter 2 is located can be cooled by liquid cooling, while the other standby power supply loop ammeter 3 only maintains the working mode of air cooling. The interval in which the commonly used power supply loop ammeter 2 is located is taken as an example. When the temperature of the interval in which the commonly used power supply loop ammeter 2 is located is greater than the set temperature threshold, the external liquid cooling pump machine increases the liquid cooling hydraulic pressure introduced into the inside of the flow guide disc pipe 704, so that the piston 802 in the inside of the flow guide disc pipe 704 will be pushed by the hydraulic pressure, so as to further move towards the three-way pipe 603, so that the shunt cavity 803 in the inside of the piston 802 is connected to the branch channel 606. At this time, the inside of the wind box 601 can guide air, and the inside of the flow guide disc pipe 704 will also have cooling liquid, so as to simultaneously carry out liquid cooling and air cooling on the interval in which the commonly used power supply loop ammeter 2 is located.

[0042] Specifically, the elastic sheet 804 is fixedly installed between the piston 802 and the inner wall of the guide disc pipe 704. When the piston 802 loses the pushing force of the cooling liquid, the piston 802 is pulled by the elastic sheet 804 to reset and move back to the inside of the sliding chamber 801. The contact surface between the piston 802 and the sliding chamber 801 is provided with a positioning clamping bead 805. Each outward sliding of the piston 802 is limited and clamped by the positioning clamping bead 805, and the piston 802 is pushed to move to the next stroke only after the hydraulic pressure reaches the set threshold.

[0043] Working principle: in use, the overall device starts to run, the fan 605 located at the back of the box 1 rotates synchronously, air located outside the box 1 is introduced into the inside of the box 1, the air entering the inside of the box 1 enters the inside of the air bellow 601 at the back of the back plate 5 through the three-way pipe 603 and the branch passage 606 (as shown in Figure 7 and Figure 8 indicated), and is blown out from the blowing exhaust 602, thereby air-cooling the current meter 2 of the normal power circuit and the current meter 3 of the standby power circuit. Under normal circumstances, the piston 802 is hidden in the inside of the sliding chamber 801. At this time, the three-way pipe 603 is directly connected with the air bellow 601. Taking the interval where the current meter 2 of the normal power circuit is located as an example, when the power controller 4 points to the current meter 2 of the normal power circuit, the electrical elements located in the interval where the current meter 2 of the normal power circuit is located start to run at this time, and the wheel disc 703 turns to the guide disc pipe 704 at the back of the interval where the current meter 2 of the normal power circuit is located, so that the guide disc pipe 704, the guide cavity 702 and the guide straight pipe 701 are connected, the liquid cooling pump connected with the guide straight pipe 701 introduces the cooling liquid into the inside of the guide disc pipe 704, thereby liquid-cooling the interval where the current meter 2 of the normal power circuit is located. When the cooling liquid flows in the inside of the guide disc pipe 704 at the back of the interval where the current meter 2 of the normal power circuit is located, the piston 802 in the inside of the guide disc pipe 704 is pushed by the hydraulic pressure at this time, thereby moving towards the direction of the three-way pipe 603, until the branch passage 606 of the three-way pipe 603 is blocked (as shown in Figure 9 and Figure 10 indicated), and the other air outlet end of the three-way pipe 603 continues to flow the air, realizing the working mode that one of the air bellows 601 is liquid-cooled and the other is air-cooled. Taking the interval where the current meter 2 of the normal power circuit is located as an example, when the temperature of the interval where the current meter 2 of the normal power circuit is located is greater than the set temperature threshold, the external liquid cooling pump increases the hydraulic pressure of the liquid cooling liquid introduced into the inside of the guide disc pipe 704 at this time, so that the piston 802 in the inside of the guide disc pipe 704 is pushed by the hydraulic pressure, thereby further moving towards the direction of the three-way pipe 603, so that the shunt cavity 803 in the inside of the piston 802 is connected with the branch passage 606 (as shown in Figure 11 andFigure 12 At this time, the air can be introduced into the bellow 601, and the cooling liquid can be introduced into the flow guide coil pipe 704, so that the current meter 2 can be cooled by the liquid cooling and the air cooling.

[0044] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and the inventive concept of the present application, can make equivalent replacements or changes within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A dual-power automatic switching distribution box, comprising a box body (1), and ammeters (2) for the main power circuit and ammeters (3) for the backup power circuit symmetrically distributed inside the box body (1), characterized in that, A power controller (4) is provided between the common power circuit ammeter (2) and the backup power circuit ammeter (3). The common power circuit ammeter (2), the backup power circuit ammeter (3) and the power controller (4) are all installed on the front of the back plate (5). The back plate (5) is mounted inside the box (1). A heat dissipation mechanism (6) for providing gas cooling is provided on the back of the back plate (5). The heat dissipation mechanism (6) includes two air boxes (601) fixedly installed on the back of the back plate (5). Several air blowers (602) are opened through the side of the air box (601). The bottom of the two air boxes (601) are connected through a three-way pipe (603). A branch channel (606) is opened on the top side of the three-way pipe (603). The first type of heat dissipation mechanism (6) is provided with a second type of heat dissipation mechanism (7) for providing liquid cooling. The second type of heat dissipation mechanism (7) includes a straight guide pipe (701) that runs through the inside of the box (1). A guide cavity (702) is fixedly installed in the middle of the back of the back plate (5). Guide coils (704) are symmetrically installed at both ends of the guide cavity (702). A control mechanism (8) for switching cooling modes is provided between the first type of heat dissipation mechanism (6) and the second type of heat dissipation mechanism (7). The control mechanism (8) includes a sliding chamber (801) provided at the end of each of the guide coils (704). A piston (802) is slidably installed inside the sliding chamber (801).

2. The dual-power automatic switching distribution box according to claim 1, characterized in that, Two bellows (601) are symmetrically distributed on the back of the common power circuit ammeter (2) and the backup power circuit ammeter (3). The air blower (602) is distributed on the back of the common power circuit ammeter (2) and the backup power circuit ammeter (3). The three-way pipe (603) is installed inside the box (1). A fan (605) is installed through the outside of the box (1). The fan (605) is horizontally distributed on the side of the three-way pipe (603).

3. A dual-power automatic switching distribution box according to claim 1, characterized in that, The straight guide pipe (701) and the guide cavity (702) are connected in a continuous manner. A wheel component (703) is provided on the back of the power controller (4). The wheel component (703) is distributed inside the guide cavity (702). Each guide coil (704) is installed inside a wind box (601) and extends through the back of the box body (1).

4. A dual-power automatic switching distribution box according to claim 1, characterized in that, The piston component (802) is vertically distributed at the end of the three-way pipe (603), and a flow divider cavity (803) is provided through the piston component (802), which is blocked by the sliding chamber (801).

5. A dual-power automatic switching distribution box according to claim 2, characterized in that, The bottom side of the three-way pipe (603) has a through opening (604), and the through opening (604) and the fan (605) are symmetrically distributed in the horizontal direction.

6. A dual-power automatic switching distribution box according to claim 1, characterized in that, A spring sheet (804) is fixedly installed between the piston (802) and the inner wall of the guide coil (704).

7. A dual-power automatic switching distribution box according to claim 1, characterized in that, A positioning bead (805) is provided between the contact surfaces of the piston (802) and the sliding chamber (801).

8. A dual-power automatic switching distribution box according to claim 1, characterized in that, A set of lifting rings (9) for crane traction are symmetrically arranged on the top of the box (1).

9. A dual-power automatic switching distribution box according to claim 1, characterized in that, A heat dissipation window (10) is provided through the bottom of the box (1), and the heat dissipation window (10) extends into the interior of the box (1).

10. A dual-power automatic switching distribution box according to claim 1, characterized in that, Rainproof baffles (11) are symmetrically arranged on both sides of the box (1), and the rainproof baffles (11) are connected to the interior of the box (1).

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