Liquid cooling device

Abstract

The invention discloses a liquid cooling device, and belongs to the field of charging pile heat dissipation, and the liquid cooling device comprises a plurality of cooling tanks, a controllable valve, an air port valve, a cooling pump, a fluid pipeline, an air cooling device, a temperature sensor PT and a data processing device. The liquid cooling device is located in one cooling tank, and the cooling tank is used for storing cooling liquid; the cooling pump is used for sucking out the cooling liquid from the cooling tank; the controllable valve is used for controlling the flow of cooling liquid entering the liquid cooling device; the air port valve is used for controlling air port circulation of the air cooling device; the liquid cooling device is used for conveying cooling liquid to a plurality of heat conducting plates in the charging pile; the air cooling device is used for dissipating heat of the heat conducting plate under a low temperature threshold value; the temperature sensor PT and the data processing device are used for detecting and analyzing temperature values of all positions in the charging pile. Liquid cooling and air cooling can be matched through temperature detection, and efficient heat dissipation is achieved.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation of charging piles, and more specifically, to a liquid cooling device. Background Art

[0002] At present, most of the 250A DC charging piles on the market can no longer meet the demand for fast charging. When pursuing high-power charging, it is necessary to focus on heat dissipation. Common heat dissipation systems include air cooling, liquid cooling and natural cooling. However, considering cost and other issues, common high-power DC charging piles are not equipped with liquid cooling devices, and the layout of the liquid cooling system of some high-power DC charging piles equipped with liquid cooling devices is more difficult, and it is necessary to increase the fan outlet, which reduces the protection level of the whole machine, so it needs to be improved. In addition, the liquid cooling system in the prior art has a low degree of coordination with the air cooling system, resulting in poor overall heat dissipation efficiency of the charging pile, which will cause irreversible damage once overloaded. Summary of the invention

[0003] In view of the problems existing in the prior art, the object of the present invention is to provide a liquid cooling device, which can realize the coordinated operation of liquid cooling and air cooling through temperature detection to dissipate heat efficiently.

[0004] To solve the above problems, the present invention adopts the following technical solutions.

[0005] A liquid cooling device, comprising a plurality of cooling tanks, a controllable valve, an air outlet valve, a cooling pump, a fluid pipeline, an air cooling device, a temperature sensor PT and a data processing device; the plurality of cooling tanks are interconnected through a plurality of fluid pipelines; the liquid cooling device is located in one of the cooling tanks, and the cooling tank is used to store coolant; the cooling pump is used to suck out the coolant from the cooling tank and lead it to the controllable valve; the controllable valve is used to control the flow of coolant entering the liquid cooling device; the air outlet valve is used to control the air outlet circulation of the air cooling device; the liquid cooling device is used to transport the coolant to a plurality of heat conducting plates in the charging pile to dissipate heat at the heat conducting plates; the air cooling device , used to dissipate heat from the heat conducting plate at a low temperature threshold; the temperature sensor PT and the data processing device are used to detect and analyze the temperature values ​​at various locations in the charging pile, and control the degree of opening of the air outlet valve and the controllable valve through the three set temperature thresholds T1, T2 and T3; when at the first temperature threshold T1, the air outlet valve is opened, and the air cooling device is started to dissipate heat from the heat conducting plate; when at the second temperature threshold T2, the degree of opening of the controllable valve is 60%, and the liquid cooling device is started to dissipate heat from the heat conducting plate; when at the third temperature threshold T3, the controllable valve is fully opened, and the liquid cooling device and the air cooling device are started at the same time to dissipate heat from the heat conducting plate.

[0006] Furthermore, the cooling tank includes a first cooling tank, a second cooling tank, a third cooling tank and a fourth cooling tank; the first cooling tank is located in the middle of the inner cavity, and a first heat exchange box and a second heat exchange box are respectively provided on both sides of the first cooling tank; the heat exchange box is used to cool the coolant flowing out of the liquid cooling device, and then flows into the liquid cooling device again after cooling; a scheduling box is provided at the lower end of the first cooling tank.

[0007] Furthermore, the second cooling groove is located at the upper end of the scheduling box; an auxiliary box is arranged in the second cooling groove, the auxiliary box is fixedly connected to the inner wall of the second cooling groove, and an air cooling device is arranged in the auxiliary box; a heat conduction plate is arranged at the lower end of the air cooling device, and the output direction of the air cooling device is toward the heat conduction plate; air outlet valves are also opened on both sides of the second cooling groove.

[0008] Furthermore, the third cooling groove is located at the upper end of the second cooling groove, an electric energy conversion box is arranged in the third cooling groove, the outer side of the electric energy conversion box is wrapped with coolant, and the coolant fills the third cooling groove.

[0009] Furthermore, the fourth cooling groove is located at the upper end of the third cooling groove, and the controllable valve and the cooling pump are placed in the third cooling groove.

[0010] Furthermore, the insulation voltage of the coolant is up to 35 kV.

[0011] Furthermore, the temperature sensor PT is electrically connected to the external data processing device, so that each temperature sensor PT collects data 20 times within 1 second, and performs anti-shake processing on the 20 times of data before performing calculation to obtain the temperature of the part.

[0012] Furthermore, the controllable valve is electrically connected to the output end of the data processing device, and then the cooling control inside the pile outputs control information to the controllable valve through the data processing device according to different thresholds of the temperature data to control the opening degree of the controllable valve for automatic adjustment.

[0013] Furthermore, the air outlet valve is electrically connected to the output end of the data processing device, and then the cooling control inside the pile outputs control information to the air outlet valve through the data processing device according to different thresholds of the temperature data to control the opening and closing of the air outlet valve.

[0014] Furthermore, the three temperature thresholds are 30°C, 45°C and 60°C respectively. When the entire charging pile is set at 30°C, the air outlet valve is adjusted to be fully open; at 45°C, the opening degree of the controllable valve reaches 60%; at 60°C, the opening degree of the controllable valve will be fully open.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] This solution changes the external air duct circulation in the prior art to the internal air duct circulation, thereby improving the overall IP protection level of the charging pile. At the same time, the liquid cooling pipe does not need to surround the heat dissipation device, one end is connected to the heat exchanger, and the rest can be arranged according to the arrangement inside the charging pile. The degree of opening of the controllable valve can be automatically adjusted according to the detected temperature data, and can be adjusted in real time. The air cooling system and the liquid cooling system cooperate with each other, which is more intelligent, improves the heat dissipation efficiency, protection level and reduces noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the middle part of the charging pile of the present invention;

[0018] Figure 2 It is a module flow chart of the present invention;

[0019] Figure 3 The figure is a curve diagram showing the relationship between the temperature of the heat sink and the opening of the controllable valve of the liquid cooling system of the present invention.

[0020] Description of the numbers in the figure:

[0021] Charging pile 1, first cooling tank 11, dispatching box 12, first heat exchange box 13, second heat exchange box 14, second cooling tank 2, auxiliary box 21, air cooling device 22, heat conduction plate 23, fluid pipeline 3, third cooling tank 4, power conversion box 41, coolant 42, fourth cooling tank 5, controllable valve 51, cooling pump 52, third heat exchange box 6. DETAILED DESCRIPTION

[0022] Embodiment 1:

[0023] See also Figure 1-2 A liquid cooling device includes a charging pile 1, and the charging pile 1 has a cavity therein. A first cooling groove 11 is provided in the middle of the charging pile 1, and a dispatching box 12 is provided at the lower end of the first cooling groove 11, and the dispatching box 12 is fixedly connected to the inner wall of the charging pile 1. A first heat exchange box 13 and a second heat exchange box 14 are respectively provided on both sides of the first cooling groove 11, and the first heat exchange box 13 is fixedly connected to the inner wall of the charging pile 1; the second heat exchange box 14 is arranged opposite to the first heat exchange box 13, and the second heat exchange box 14 is fixedly connected to the other inner wall of the charging pile 1.

[0024] The upper end of the dispatch box 12 is provided with a second cooling groove 2, and the second cooling groove 2 is not connected to the first cooling groove 11. An auxiliary box 21 is provided in the second cooling groove 2, and the auxiliary box 21 is fixedly connected to the inner wall of the second cooling groove 2. The auxiliary box 21 is a cavity, and an air cooling device 22 is provided in the cavity, and the output direction of the air cooling device 22 is vertically downward. A heat conducting plate 23 is provided at the lower end of the air cooling device 22 so that the output direction of the air cooling device 22 is directed toward the heat conducting plate 23. The back side of the dispatch box 12, the auxiliary box 21 and the power conversion box 41 close to the cooling groove is also provided with a corresponding heat conducting plate 23. Air vent valves are also provided on both sides of the second cooling groove to allow the wind to flow out when the air cooling device 22 is started.

[0025] The two side ends of the heat conducting plate 23 are connected with fluid pipes 3, and the fluid pipes 3 respectively connect the second cooling tank 2, the first heat exchange box 13, the second heat exchange box 14, the third cooling tank 4, the fourth cooling tank 5 and the third heat exchange box 6 in parallel so that they are interconnected.

[0026] The upper end of the second cooling groove 2 is provided with a third cooling groove 4, and a power conversion box 41 is provided in the third cooling groove 4, and the power conversion box 41 is fixedly connected to the inner wall of the third cooling groove 4. The third cooling groove 4 is filled with a coolant 42, and the insulation voltage of the coolant 42 can reach 35kV.

[0027] A fourth cooling slot 5 is disposed at the upper end of the third cooling slot 4. Controllable valves 51 are disposed on both sides of the fourth cooling slot 5. The controllable valves 51 control the ports of the fluid pipeline 3 at both ends. A cooling pump 52 is also disposed in the fourth cooling slot 5. The cooling pump 52 is used to control the direction of the fluid in the fluid pipeline 3 and the direction of cooling.

[0028] The dispatch box 12, the auxiliary box 21, the power conversion box 41 and the first cooling groove 11 are also provided with a temperature sensor PT corresponding to the detection temperature. The temperature sensor PT is electrically connected to the external data processing device so that each temperature sensor PT collects 20 data in 1 second, and the 20 data are first anti-shake processed and then calculated to obtain the temperature of the part. The controllable valve 51 is electrically connected to the output end of the data processing device, and then the cooling control in the pile outputs control information to the controllable valve 51 through the data processing device according to the different thresholds of the temperature data, so as to automatically adjust the opening degree of the controllable valve 51; the air outlet valve is electrically connected to the output end of the data processing device, and then the cooling control in the pile outputs control information to the air outlet valve through the data processing device according to the different thresholds of the temperature data, and the air outlet valve is opened and closed; the heat in the pile is cooled along the fluid pipeline to the heat exchange box, thereby circulating. The temperature has three threshold points of 30℃, 45℃ and 60℃. When the entire charging pile is set at 30℃, the air vent valve is adjusted to be fully open; at 45℃, the opening degree of the controllable valve 51 reaches 60%; at 60℃, the opening degree of the controllable valve 51 will be fully open.

[0029] Taking the power conversion box as an example, the heat loss of this part is P2 = I 2 R, where I is the input current and R is the total resistance of the power conversion box; when the temperature rises by 1°C, the heat consumed is about 1 calorie, so the total heat consumed is Q=Pt; 1 calorie=4.2J; because the allowable temperature rise in the pile body is Q / 4.2=cmΔT (ΔT is the maximum allowable temperature rise inside the system, unit K, V (CMM) is the air volume flow, unit m 3 / min, 1CMM=35.3CFM); the air mass flow rate m=ρV(CMM); therefore, from the above calculation, the required fan air volume is

[0030] like Figure 3 The figure shows the relationship between the heat sink temperature of the liquid cooling system and the opening of the controllable valve. The temperature has three thresholds: T1, T2 and T3. When the temperature data transmitted to the control board reaches T1 at a certain moment, the air outlet valve will be adjusted to be fully open through the algorithm. When the temperature data reaches the T2 threshold, the opening degree of the controllable valve 51 will reach 60%; when the temperature data reaches the T3 threshold, the opening degree of the controllable valve 51 will be fully open.

[0031] Working principle:

[0032] When this device is in use, it first uses a temperature sensor to perform numerical detection on the temperature at various locations in the charging pile. The numerical detection analysis divides the temperature threshold into three temperature stages, and 30, 45 and 60 correspond to the opening degrees of different valves. At a certain moment, the temperature data transmitted to the control board reaches T1, at which time the air outlet valve will be adjusted to fully open through the algorithm; when the temperature data reaches the T2 threshold, the controllable valve opening degree will reach 60%; when the temperature data reaches the T3 threshold, the controllable valve opening degree will be fully open. When the temperature is at the first threshold, the air cooling device starts and heat dissipation is carried out; when the temperature is at the second threshold, the liquid cooling device starts and the air cooling device is turned off; when the temperature is at the third threshold, the liquid cooling device and the air cooling device start at the same time to improve the efficiency of heat dissipation.

Claims

1. A liquid cooling device, characterized in that: It comprises a plurality of cooling slots, a controllable valve (51), an air outlet valve, a cooling pump (52), a fluid pipeline (3), an air cooling device (22), a temperature sensor PT and a data processing device; The plurality of cooling grooves are interconnected via a plurality of fluid pipelines (3); a liquid cooling device is located in one of the cooling grooves, and the cooling groove is used to store a cooling liquid (42); The cooling pump (52) is used to suck out the cooling liquid (42) from the cooling tank and lead it to the controllable valve (51); The controllable valve (51) is used to control the flow rate of the cooling liquid (42) entering the liquid cooling device; The air outlet valve is used to control the air outlet flow of the air cooling device; The liquid cooling device is used to transport the coolant to multiple heat conducting plates in the charging pile to dissipate heat at the heat conducting plates; The air cooling device (22) is used to dissipate heat from the heat conducting plate at a low temperature threshold; The temperature sensor PT and the data processing device are used to detect and analyze the temperature values ​​at various locations in the charging pile, and to control the degree of opening of the air vent valve and the controllable valve (51) by setting three temperature thresholds T1, T2 and T3; When the temperature is at the first temperature threshold T1, the air outlet valve opens, and the air cooling device starts to dissipate heat from the heat transfer plate; when the temperature is at the second temperature threshold T2, the opening degree of the controllable valve is 60%, and the liquid cooling device starts to dissipate heat from the heat transfer plate; when the temperature is at the third temperature threshold T3, the controllable valve is fully opened, and the liquid cooling device and the air cooling device start at the same time to dissipate heat from the heat transfer plate.

2. A liquid cooling device according to claim 1, characterized in that: The cooling groove comprises a first cooling groove (11), a second cooling groove (2), a third cooling groove (4) and a fourth cooling groove (5); the first cooling groove (11) is located in the middle of the inner cavity, and a first heat exchange box (13) and a second heat exchange box (14) are respectively arranged on both sides of the first cooling groove (11); the heat exchange box is used to cool the cooling liquid flowing out of the liquid cooling device, and then the cooling liquid flows into the liquid cooling device again; a scheduling box (12) is arranged at the lower end of the first cooling groove (11).

3. A liquid cooling device according to claim 2, characterized in that: The second cooling groove (2) is located at the upper end of the dispatching box (12); an auxiliary box (21) is arranged in the second cooling groove (2), the auxiliary box (21) is fixedly connected to the inner wall of the second cooling groove (2), and an air cooling device (22) is arranged in the auxiliary box (21); a heat conduction plate (23) is arranged at the lower end of the air cooling device (22), and the output direction of the air cooling device (22) is toward the heat conduction plate (23); air outlet valves are also provided on both sides of the second cooling groove (2).

4. A liquid cooling device according to claim 2, characterized in that: The third cooling groove (4) is located at the upper end of the second cooling groove (2), an electric energy conversion box (41) is arranged in the third cooling groove (4), the outer side of the electric energy conversion box (41) is wrapped with a cooling liquid (42), and the cooling liquid (42) fills the third cooling groove (4).

5. A liquid cooling device according to claim 2, characterized in that: The fourth cooling groove (5) is located at the upper end of the third cooling groove (4), and the controllable valve (51) and the cooling pump (52) are placed in the third cooling groove (4).

6. A liquid cooling device according to claim 4, characterized in that: The insulation voltage of the cooling liquid (42) is at most 35 kV.

7. The liquid cooling device according to claim 1, characterized in that: The temperature sensor PT is electrically connected to the external data processing device, so that each temperature sensor PT collects data 20 times within 1 second, and performs anti-shake processing on the 20 times of data before calculation to obtain the temperature of the part.

8. The liquid cooling device according to claim 1, characterized in that: The controllable valve (51) is electrically connected to the output end of the data processing device, and then the cooling control inside the pile outputs control information to the controllable valve (51) through the data processing device according to different thresholds of the temperature data, so as to control the opening degree of the controllable valve (51) for automatic adjustment.

9. The liquid cooling device according to claim 1, characterized in that: The air outlet valve is electrically connected to the output end of the data processing device, and then the cooling control in the pile outputs control information to the air outlet valve through the data processing device according to different thresholds of the temperature data to control the switch of the air outlet valve.

10. The liquid cooling device according to claim 1, characterized in that: The three temperature thresholds are 30°C, 45°C and 60°C respectively. When the entire charging pile is set at 30°C, the air outlet valve is adjusted to be fully open; at 45°C, the opening degree of the controllable valve (51) reaches 60%; at 60°C, the opening degree of the controllable valve (51) will be fully open.

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