Cooling system of explosion-proof control box

Abstract

The utility model belongs to the technical field of temperature control, and relates to a cooling system of an explosion-proof control box, which comprises a bottom plate used for being connected with the bottom of the explosion-proof control box; the top plate is arranged on the lower side of the bottom plate; the spiral water channel is arranged between the bottom plate and the top plate, a space defined by the spiral water channel, the top plate and the bottom plate forms a cooling channel for cooling water to circulate, the cooling channel is provided with a water inlet and a water outlet, and the water inlet is used for being communicated with a cooling liquid tank on the underground anti-explosion vehicle; the spiral water channel comprises a plurality of sets of straight pipelines arranged in parallel, every two adjacent straight pipelines are communicated through a bent pipeline, the water inlet and the water outlet are located in the two straight pipelines on the outermost side respectively, and a heat dissipation plate set is arranged between every two straight pipelines. An arc water diversion plate is arranged on each two bent pipelines, and the arc water diversion plates and the bent pipelines are concentrically arranged. According to the invention, the cooling efficiency of the cooling system is improved, and the thermal load of the insulated gate bipolar transistor inverter is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature control, and particularly relates to a cooling system for an explosion-proof control box. Background Art

[0002] An explosion-proof control box for accommodating a controller and important circuit parts is generally provided on an underground explosion-proof vehicle. The insulated gate bipolar transistor inverter in the explosion-proof control box is a high-performance power converter, which is used to convert a DC power supply into an alternating current and can work at high voltages and high frequencies to provide a relatively high output power. When the insulated gate bipolar transistor inverter is working, the range of its normal working temperature is -55 to 75 degrees. However, when the insulated gate bipolar transistor inverter is working, the large current and high voltage on it are likely to generate high temperatures, making the temperature on the explosion-proof control box easily exceed 250 degrees. Such high temperatures will seriously affect or damage various controllers and circuits in the explosion-proof control box, resulting in damage to the circuits of the entire vehicle, and even causing safety accidents in severe cases. Therefore, the design of the cooling system on the explosion-proof control box is crucial for the normal operation of the explosion-proof vehicle.

[0003] The cooling system of a conventional explosion-proof control box is highly regarded as an important component for ensuring safety. In the current design, the explosion-proof requirements must be considered simultaneously, and the space occupied by the cooling system should be minimized as much as possible to fit the space arrangement of the vehicle. Therefore, the structure of the cooling system in the prior art is only a cooling water cavity, where the water flows irregularly, and the heat carried away by the inlet and outlet water is small, resulting in low cooling efficiency of the cooling system, high average temperature on the explosion-proof control box, and large thermal load of the insulated gate bipolar transistor inverter inside the explosion-proof control box. Summary of the Invention

[0004] In view of this, the present invention provides a cooling system for an explosion-proof control box, which uses a hierarchical spiral water channel with uniform flow distribution and directional flow guiding to solve the technical problems of low cooling efficiency of the cooling system in the prior art, high average temperature on the explosion-proof control box, and large thermal load of the insulated gate bipolar transistor inverter inside the explosion-proof control box.

[0005] The technical solution of the present invention is as follows:

[0006] A cooling system for an explosion-proof control box, comprising:

[0007] A bottom plate for connecting to the bottom of the explosion-proof control box;

[0008] A top plate provided on the lower side of the bottom plate;

[0009] A spiral water channel is provided between the bottom plate and the top plate. The space enclosed by the spiral water channel, the top plate and the bottom plate forms a cooling channel through which cooling water flows. The cooling channel has an inlet and an outlet. The inlet is used to communicate with the coolant tank on the underground explosion-proof vehicle, and the outlet is used to communicate with the radiator tank on the underground explosion-proof vehicle. The spiral water channel includes multiple groups of straight pipes arranged in parallel, and adjacent two straight pipes are connected by a bent pipe. The inlet and the outlet are respectively located on the two outermost straight pipes.

[0010] Multiple heat dissipation plate groups are respectively arranged in the middle of each straight pipe, and along the direction from the inlet to the outlet, the surface areas of the multiple heat dissipation plate groups gradually decrease.

[0011] Further, each heat dissipation plate group includes multiple vertical water distribution plates arranged in parallel. The length direction of the vertical water distribution plate is the same as the length direction of the straight pipe, and both ends of the vertical water distribution plate are respectively fixedly connected to the top plate and the bottom plate.

[0012] Further, the vertical water distribution plate includes an arc plate, a first plate body and a second plate body. Among them, the first plate body and the second plate body are arranged in parallel and have the same structure. Both ends of the arc plate are respectively fixedly connected to one end of the first plate body and the second plate body. One opposite side surfaces of the arc plate, the first plate body and the second plate body are respectively fixedly connected to the top plate and the bottom plate.

[0013] Further, there are \(n\) vertical water distribution plates. The \(n\) vertical water distribution plates have the same structure and are divided into three groups arranged at intervals. Each group has two vertical water distribution plates. The straight line passing through the midlines of the two vertical water distribution plates is parallel to the length direction of the straight pipe, and the arc plates on the two vertical water distribution plates are located on the sides away from each other.

[0014] Further, the multiple vertical water distribution plates are arranged in a staggered manner.

[0015] Further, it further includes a parallel guide plate. The parallel guide plate is located between the two vertical water distribution plates in the middle group, and the parallel guide plate and the two vertical water distribution plates are on the same straight line. The parallel guide plate includes two parallel and spaced third plate bodies, and the distance between the two third plate bodies is equal to the distance between the first plate body and the second plate body.

[0016] Further, the materials of the arc plate, the first plate body, the second plate body, the third plate body, the bottom plate and the top plate are copper.

[0017] Further, an arc water distribution plate is provided on each bent pipe. The length direction of the arc water distribution plate is the same as the length direction of the bent pipe, and both ends of the bent pipe are respectively fixedly connected to the top plate and the bottom plate.

[0018] Further, the arc water diversion plate and the bent pipe are concentrically arranged, and the arc water diversion plate is located in the middle of the bent pipe.

[0019] Compared with the prior art, for the cooling system of an explosion-proof control box provided by the present invention, after cooling water is led out from the vehicle's cooling system and enters the spiral water channel, the vertical water diversion plate evenly diverts the cooling water into the cooling water pan cavities of each area. Under the directional diversion of the arc water diversion plate, the cooling water quickly distributes from the high-temperature area of the inverter area to the surrounding area of the circuit area, accelerating the cooling of the high-temperature heat load area, reducing the resistance of the cooling water from the high-temperature area to the circuit area, improving the cooling efficiency of the cooling system, reducing the heat load of the insulated gate bipolar transistor inverter, with strong practicability and worthy of popularization. Description of the Drawings

[0020] Figure 1 It is the internal structure diagram of the present invention after removing the top plate.

[0021] Figure 2 It is the overall structure schematic diagram of the present invention.

[0022] Figure 3 It is the partial structure schematic Figure 1 。

[0023] Figure 4 It is the partial structure schematic Figure 2 。 Detailed Embodiments

[0024] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 to the present invention.

[0025] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0026] In addition, it should be noted that the connections involved in the present invention can be achieved by conventional connection methods and do not involve any innovation.

[0027] The subject matter of the present invention relates to a cooling system for an explosion-proof control box, which is applied to an underground explosion-proof vehicle and is used to accommodate a controller and important circuit parts. The insulated gate bipolar transistor inverter in the explosion-proof control box is a high-performance power converter, which is used to convert a DC power supply into an AC power supply and can operate at high voltages and high frequencies to provide a relatively high output power. When the insulated gate bipolar transistor inverter is working, the range of its normal operating temperature is -55 to 75 degrees. However, when the insulated gate bipolar transistor inverter is working, the large current and large voltage on it are likely to generate high temperatures, making the temperature on the explosion-proof control box easily exceed 250 degrees. Such high temperatures will seriously affect or damage various controllers and circuits in the explosion-proof control box, causing damage to the entire vehicle's circuit and even causing safety accidents in severe cases. Therefore, the design of the cooling system on the explosion-proof control box is crucial for the normal operation of the explosion-proof vehicle.

[0028] The conventional cooling system for an explosion-proof control box is highly regarded as an important component for ensuring safety. In the current design, the explosion-proof requirements must be considered simultaneously, and the space occupied by the cooling system should be minimized as much as possible to fit the space setting of the vehicle. Therefore, the structure of the cooling system in the prior art is only a cooling water chamber, and the water flows irregularly inside. However, in this way, the heat carried away by the inlet and outlet water is less, resulting in low cooling efficiency of the cooling system and high average temperature on the explosion-proof control box, leading to a large thermal load on the insulated gate bipolar transistor inverter inside the explosion-proof control box.

[0029] For the above reasons, the present invention provides a cooling system for an explosion-proof control box to facilitate the solution of the above-mentioned technical problems. The following combines Figures 1 to 4 the structural schematic diagram to describe the present invention in detail.

[0030] Embodiment 1

[0031] A cooling system for an explosion-proof control box provided by the present invention is used to be arranged at the bottom of the explosion-proof control box. As Figure 1 shown, specifically, the structure of the cooling system includes a bottom plate 1, a top plate 2, a spiral water channel 3, a heat dissipation plate group 4, and an arc water dividing plate 5.

[0032] Among them, as Figure 2 shown, both sides of the spiral water channel 3 are fixedly connected to the top plate 2 and the bottom plate 1 respectively, so that the space enclosed by the spiral water channel 3, the top plate 2, and the bottom plate 1 forms a cooling channel for the cooling water to flow through. The cooling channel has an inlet and an outlet. The inlet is used to communicate with the coolant tank on the underground explosion-proof vehicle, and the outlet is used to communicate with the radiator tank on the underground explosion-proof vehicle.

[0033] Among them, as a further refinement of this embodiment, the bottom plate 1 is used to connect to the bottom surface of the explosion-proof control box. To facilitate the connection between the bottom plate 1 and the bottom surface of the explosion-proof control box, as Figure 1 shown, 16 threaded blind holes for connection can be provided on the bottom surface of the explosion-proof control box body. The threaded blind holes are M8, the length of the threaded holes is 12 mm, the explosion-proof distance at the bottom of the threaded blind holes is 14 mm, and the threaded blind holes can be arranged in a uniformly distributed manner on each side. The size of the bottom plate 1 can be designed to match the bottom surface of the explosion-proof control box. At the same time, 16 connection holes are correspondingly provided thereon. These connection holes are used for passing screws. The positions of the 16 connection holes correspond one by one to the positions of the 16 threaded blind holes for connection. When connecting, the screws can be passed through the connection holes and then threadedly connected to the blind holes, so that the bottom plate 1 is tightly connected to the bottom surface of the explosion-proof control box to meet the explosion-proof requirements.

[0034] Among them, as a further refinement of this embodiment, as Figure 1 shown, the spiral water channel 3 includes multiple groups of straight pipes 31 arranged in parallel. Adjacent two straight pipes 31 are connected by a bent pipe 32. The water inlet and the water outlet are respectively located on the two outermost straight pipes 31, and the water inlet and the water outlet are respectively circular pipe bodies.

[0035] Among them, as a further preferred solution of this embodiment, the pipe body diameters of the water inlet and the water outlet are 30 mm.

[0036] To improve the heat conduction efficiency and make the heat taken away by the cooling water as much as possible, heat dissipation plate groups 4 are provided in the middle of each straight pipe 31. As Figure 3 shown, each heat dissipation plate group 4 includes multiple vertical water distribution plates 41 arranged in parallel. The length direction of the vertical water distribution plates 41 is the same as the length direction of the straight pipe 31, and both ends of the vertical water distribution plates 41 are respectively fixedly connected to the top plate 2 and the bottom plate 1.

[0037] Specifically, the vertical water distribution plate 41 includes an arc-shaped plate, a first plate body and a second plate body. Among them, the first plate body and the second plate body are arranged in parallel and have the same structure. Both ends of the arc-shaped plate are respectively fixedly connected to one end of the first plate body and the second plate body. One opposite side surfaces of the arc-shaped plate, the first plate body and the second plate body are respectively fixedly connected to the top plate 2 and the bottom plate 1.

[0038] More specifically, the cross-section of the vertical water distribution plate 41 is set to be U-shaped, with one end being an open end and the other end forming a closed end. The central angle of the arc-shaped plate is set to 180 degrees, so that the closed end forms a smooth transition surface.

[0039] More specifically, as one specific implementation manner, to guide the fluid and improve the heat conduction performance at the same time, as Figure 3As shown, six vertical water dividers 41 can be provided. The six vertical water dividers 41 have the same structure and are divided into three groups arranged at intervals. Each group has two vertical water dividers 41. The straight line passing through the midlines of the two vertical water dividers 41 is parallel to the length direction of the straight pipe 31, and the open ends of the two vertical water dividers 41 are adjacent to each other, that is, the arc-shaped plates on the two vertical water dividers 41 are located on the sides away from each other.

[0040] Further specifically, as another specific embodiment, in order to guide the fluid and improve the heat conduction performance, as Figure 4 shown, six vertical water dividers 41 can be provided. The six vertical water dividers 41 are divided into three groups arranged at intervals. Each group has two vertical water dividers 41. The straight line passing through the midlines of the two vertical water dividers 41 is parallel to the length direction of the straight pipe 31, and the open ends of the two vertical water dividers 41 are adjacent to each other. A parallel guide plate 42 is added to the middle group. The parallel guide plate 42 is located between the two vertical water dividers 41, and the parallel guide plate 42 and the two vertical water dividers 41 are on the same straight line. As a specific implementation scheme, the parallel guide plate 42 in this embodiment includes two third plate bodies arranged in parallel and at intervals, and the distance between the two third plate bodies is equal to the distance between the first plate body and the second plate body.

[0041] In order to prevent energy loss on the bent pipe 32 as much as possible and quickly introduce the cooling water into the straight pipe 31, as Figure 1 shown, an arc-shaped water divider 5 is provided on each bent pipe 32. The arc-shaped water divider 5 is concentric with the bent pipe 32, and the arc-shaped water divider 5 is located in the middle of the bent pipe 32.

[0042] Among them, as a further preferred scheme of this embodiment, in order to improve the heat dissipation efficiency of the heat dissipation plate group 4, the materials of the arc-shaped water divider 5, the arc-shaped plate, the first plate body, the second plate body, the third plate body, the bottom plate 1 and the top plate 2 are copper. The height of the vertical water divider 41 is preferably 35 mm, and the thickness is preferably 4 mm to facilitate heat transfer.

[0043] In order to illustrate the working principle of the cooling system provided by the present invention, the heat dissipation area is divided into a rapid drop area S, a variable temperature area B and a stable area W according to the difference in temperature change.

[0044] Among them, as a further preferred scheme of this embodiment, in order to increase the contact area between the heat dissipation plate group 4 and the cooling water as much as possible, the contact area between the heat dissipation plate group 4 and the cooling water should be increased significantly. In a specific implementation manner, the lengths of the vertical water dividers 41 and the parallel guide plate 42 can be as long as possible.

[0045] In order to achieve the largest possible thermal conductivity while maximizing cost savings, based on the principle that the water temperature gradually decreases as the cooling water flows through the spiral water channel 3, the surface area of the heat dissipation plate group 4 can be designed to gradually decrease along the direction from the water inlet to the water outlet.

[0046] As Figure 1 shown, the surface area of the heat dissipation plate group 4 in the rapid drop zone S is denoted as A1, which can also be expressed as the contact area between the heat dissipation plate group 4 and the cooling water. The surface area of the heat dissipation plate group 4 in the temperature change zone B is denoted as A2, and the surface area of the heat dissipation plate group 4 in the stable zone W is denoted as A3. The values of A1, A2, and A3 decrease successively to balance the heat conduction ability and economy to the greatest extent.

[0047] In actual design, the specific structure of the spiral water channel 3 can be designed according to actual needs. There can be many straight pipes 31. Specifically, in this embodiment, as Figure 2 shown, there are 6 straight pipes 31, with every two as a group. Each group is respectively located in the rapid drop zone S, the temperature change zone B, and the stable zone W. The cooling water enters the spiral water channel 3 through the water inlet and flows out through the water outlet. In order to maximize the heat conduction and heat dissipation efficiency, the maximum length of the vertical water distribution plate 41 in the rapid drop zone S is set to 120 mm, the maximum length of the vertical water distribution plate 41 in the temperature change zone B is set to 100 mm, and the maximum length of the vertical water distribution plate 41 in the stable zone W is set to 80 mm. The maximum length of the vertical water distribution plate 41 here refers to the total length from when the cooling water enters the straight pipe 31 and contacts the vertical water distribution plate 41 to when it leaves the vertical water distribution plate 41, rather than simply referring to the length of a single vertical water distribution plate 41, and it can also be the total length of multiple vertical water distribution plates 41.

[0048] Among them, as a further preferred solution of this embodiment, in this embodiment, as Figure 2 shown, there are 14 vertical water distribution plates 41 in the rapid drop zone S on the spiral water channel 3, with a total heat dissipation length of 240 mm and a thickness of 4 mm for the vertical water distribution plate 41. The cooling water is then guided by the arc water distribution plate 5 into the temperature change zone B. There are 14 vertical water distribution plates 41 in the temperature change zone B, with a total heat dissipation length of 200 mm and a thickness of 4 mm. The cooling water is then guided by the arc water distribution plate 5 into the stable zone W. There are 14 vertical water distribution plates 41 in the stable zone W, with a total heat dissipation length of 160 mm and a thickness of 4 mm. Finally, the cooling water returns from the stable zone W to the radiator water tank of the vehicle through the water outlet.

[0049] During use, as Figure 1As shown in the figure, the cooling water enters the spiral water channel 3 under the power of the water pump, passes through the water channel that dissipates heat through the vertical water dividing plate 41 in the speed reduction area S facing the inverter position, so that the cooling water in the total water inlet channel is evenly divided, then enters the temperature change area B at 180°, and then enters the stable area W along the arc water dividing plate 5, and finally returns to the radiator through the water return area to enter the cooling cycle.

[0050] This heat dissipation device does not require a separate dedicated water tank. The return water is directly connected from the radiator water tank on the underground explosion-proof vehicle, and the water inlet is connected at the water inlet of the water pump. The cooling water is the coolant in the coolant tank on the underground explosion-proof vehicle. The water pump sprays high-pressure water into the heat dissipation device. After absorbing the heat of the inverter in the speed reduction area S of the explosion-proof control box, it enters the circuit part area, absorbs heat again, enters the stable area W, stabilizes the temperature of the entire explosion-proof control box, and the return water goes back to the radiator water tank of the vehicle.

[0051] A cooling system for an explosion-proof control box provided by the present invention, through the explosion-proof control box assembly test and vehicle test, in the special heat dissipation test, when the same inlet water temperature is 80 degrees and the outlet water temperature is 105 degrees, the measured point temperature of the explosion-proof control box assembly can be reduced by 30 degrees. The results of the comparative experiment show that the cooling system for an explosion-proof control box provided by the present invention can significantly improve the cooling effect by adopting the cooling scheme.

[0052] A cooling system for an explosion-proof control box provided by the present invention can set a heat dissipation device on the explosion-proof control box without damaging the explosion-proof structure. It dissipates heat from the insulated gate bipolar transistor inverter by means of water cooling. The coolant flows into each heat dissipation area in an orderly manner, and at the same time, the water flow cycle takes away the heat, which can play a very good role in cooling the entire explosion-proof control box, ensuring that the working temperature of the explosion-proof control box is below 75 degrees, improving the cooling efficiency of the cooling system, reducing the thermal load of the insulated gate bipolar transistor inverter, and at the same time ensuring the explosion-proof strength of the control box. It has strong practicability and is worthy of popularization.

[0053] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A cooling system for an explosion-proof control box, characterized in that: include: A bottom plate (1), used for connecting to the bottom of the explosion-proof control box; A top plate (2) arranged on the lower side of the bottom plate (1); The spiral water channel (3) is arranged between the bottom plate (1) and the top plate (2). The space enclosed by the spiral water channel (3), the top plate (2) and the bottom plate (1) constitutes a cooling channel for cooling water to flow. The cooling channel has a water inlet and a water outlet. The water inlet is used to communicate with a coolant tank on an underground explosion-proof vehicle, and the water outlet is used to communicate with a radiator water tank on the underground explosion-proof vehicle. The spiral water channel (3) includes a plurality of groups of parallel straight pipes (31). Two adjacent straight pipes (31) are connected by a curved pipe (32). The water inlet and the water outlet are respectively located on the two outermost straight pipes (31). A plurality of heat dissipation plate groups (4) are arranged one by one in the middle of each straight pipe (31), and the surface areas of the plurality of heat dissipation plate groups (4) decrease successively along the direction from the water inlet to the water outlet.

2. The cooling system of an explosion-proof control box according to claim 1, characterized in that: The heat dissipation plate group (4) comprises a plurality of vertical water distribution plates (41) arranged in parallel, the length direction of the vertical water distribution plates (41) is consistent with the length direction of the straight pipe (31), and the two ends of the vertical water distribution plates (41) are respectively fixedly connected to the top plate (2) and the bottom plate (1).

3. The cooling system of an explosion-proof control box according to claim 2, characterized in that: The vertical water-dividing plate (41) comprises an arc-shaped plate, a first plate body and a second plate body, wherein the first plate body and the second plate body are arranged in parallel and have the same structure, the two ends of the arc-shaped plate are respectively fixedly connected to one end of the first plate body and the second plate body, and one opposite side surface of the arc-shaped plate, the first plate body and the second plate body are respectively fixedly connected to the top plate (2) and the bottom plate (1).

4. The cooling system of an explosion-proof control box according to claim 3, characterized in that: There are six vertical water distribution plates (41), and the six vertical water distribution plates (41) have the same structure and are divided into three groups arranged at intervals, each group having two vertical water distribution plates (41). A straight line passing through the center lines of the two vertical water distribution plates (41) is parallel to the length direction of the straight pipe (31), and the arc plates on the two vertical water distribution plates (41) are located on the sides away from each other.

5. The cooling system of an explosion-proof control box according to claim 4, characterized in that: The plurality of vertical water distribution plates (41) are arranged in a staggered manner.

6. The cooling system of an explosion-proof control box according to claim 5, characterized in that: It also includes a parallel guide plate (42), the parallel guide plate (42) is located between the two vertical water divider plates (41) in the middle group, and the parallel guide plate (42) and the two vertical water divider plates (41) are located on the same straight line, and the parallel guide plate (42) includes two third plate bodies that are parallel and spaced apart, and the distance between the two third plate bodies is equal to the distance between the first plate body and the second plate body.

7. The cooling system of an explosion-proof control box according to claim 6, characterized in that: The material of the arc-shaped plate, the first plate body, the second plate body, the third plate body, the bottom plate (1) and the top plate (2) is copper.

8. The cooling system of an explosion-proof control box according to claim 1, characterized in that: A circular arc water distribution plate (5) is provided on each curved pipe (32), the length direction of the circular arc water distribution plate (5) is consistent with the length direction of the curved pipe (32), and the two ends of the curved pipe (32) are fixedly connected to the top plate (2) and the bottom plate (1) respectively.

9. The cooling system of an explosion-proof control box according to claim 8, characterized in that: The circular arc water dividing plate (5) and the curved pipeline (32) are arranged concentrically, and the circular arc water dividing plate (5) is located in the middle of the curved pipeline (32).

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