A charging pile cooling system and a cooling adjustment method

Abstract

The present invention relates to a charging pile cooling system and a cooling adjustment method in the technical field of charging pile cooling, including an air compression device, a condensation device, a gas-liquid separation device, more than one group of charging devices, and a main control device. The outlet of the air compression device is connected to the inlet of the condensation device, the outlet of the condensation device is connected to the refrigerant inlet of the charging device, the refrigerant outlet of the charging device is connected to the inlet of the gas-liquid separation device, the outlet of the gas-liquid separation device is connected to the inlet of the air compression device, and the main control device is electrically connected to the charging device, the air compression device, and the condensation device, and the main control device is used to control the variable-frequency power of the condensation device and the rotation speed of the air compression device, solving the problem that the existing cooling method of the charging pile only cools inside the charging pile and the cooling and heat dissipation efficiency is not high.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile cooling, and particularly relates to a charging pile cooling system and a cooling adjustment method. Background Art

[0002] With the popularization of new energy vehicles, high-power charging piles for rapid charging have become the development trend of new energy vehicle charging technology. In order to shorten the charging time of new energy vehicles, in recent years, relevant enterprises at home and abroad have begun to layout high-power charging piles one after another.

[0003] To ensure the normal operation of high-power charging piles and avoid damage caused by excessive temperature of the internal charging modules, it is necessary to efficiently cool high-power charging piles. Most of the existing charging piles usually do not have a dedicated compression direct cooling system, and only forced exhaust fans are installed in the charging power cabinets of each charging pile inside to cool down. This forced convection air cooling method has limited heat dissipation power. Therefore, the current traditional charging pile heat dissipation method can no longer meet the heat dissipation and use requirements of the new generation of high-power charging piles. Summary of the Invention

[0004] Aiming at the shortcomings in the prior art, the present invention provides a charging pile cooling system and a cooling adjustment method, which solve the problem that the cooling method of the existing charging piles only cools inside the charging piles and has low cooling and heat dissipation efficiency.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A charging pile cooling system includes an air compression device, a condensation device, a gas-liquid separation device, one or more groups of charging devices, and a main control device. The outlet of the air compression device is connected to the inlet of the condensation device, the outlet of the condensation device is connected to the refrigerant inlet of the charging device, the refrigerant outlet of the charging device is connected to the inlet of the gas-liquid separation device, the outlet of the gas-liquid separation device is connected to the inlet of the air compression device, the main control device is electrically connected to the charging device, the air compression device, and the condensation device, and the main control device is used to control the variable frequency power of the condensation device and the rotation speed of the air compression device.

[0007] Optionally, the charging device includes a charging pile component and an expansion valve. The expansion valve is installed at the refrigerant inlet pipe of the charging pile component. The expansion valve is used to control the size of the refrigerant flow rate entering the charging pile component, and the main control device is used to control the opening and closing of the expansion valve.

[0008] Optionally, the charging pile component includes a charging pile body and a radiator. The charging pile body is installed on the side wall of the radiator, and the radiator is provided with a refrigerant inlet and a refrigerant outlet.

[0009] Optionally, solenoid valves are provided at the refrigerant inlet pipe and the refrigerant outlet pipe of the charging pile assembly, and the solenoid valves are electrically connected to the main control device.

[0010] Optionally, a heat-conducting material is provided between the charging pile body and the radiator.

[0011] Optionally, the charging pile assembly is further provided with a charging connection cable for charging.

[0012] Optionally, a temperature detection component is further included, and the temperature detection component is arranged inside the charging pile body or on the side wall of the charging pile body.

[0013] Optionally, more than one group of the charging devices are arranged in parallel.

[0014] A charging pile cooling adjustment method, which is applied to the charging pile cooling system as described in any one of the above, includes the following steps:

[0015] Obtain the opening value before adjustment and the opening value after adjustment of the expansion valve;

[0016] Set a standard temperature and a standard temperature difference, calculate the temperature adjustment difference after the expansion valve is adjusted, and determine whether the temperature adjustment difference is within the standard temperature difference;

[0017] According to the judgment result, determine whether to continue to adjust the expansion valve or adjust the condensing device and the air compression device, so that the temperature adjustment difference of the last adjustment is within the standard temperature difference.

[0018] Optionally, determining whether to continue to adjust the expansion valve or adjust the condensing device and the air compression device according to the judgment result includes the following steps:

[0019] If the temperature adjustment difference is within the standard temperature difference, there is no need to continue to adjust the expansion valve, the condensing device and the air compression device;

[0020] If the temperature adjustment difference is not within the standard temperature difference and the expansion valve has not reached the maximum opening value, continue to adjust the expansion valve;

[0021] If the temperature adjustment difference is not within the standard temperature difference and the expansion valve has reached the maximum opening value, adjust the condensing device and the air compression device.

[0022] Adopting the technical solution provided by the present invention, compared with the prior art, the following beneficial effects are obtained:

[0023] The temperature of the charging pile body during charging operation is monitored in real time by a temperature detection component. The main control device adjusts the opening degree of the expansion valve, the rotational speed of the variable-frequency fan of the condensation device, and the rotational speed of the air compression device according to the temperature value monitored by the temperature detection component, and then adjusts the refrigerant flow rate into the radiator, so that during charging operation, the refrigerant can efficiently absorb the heat generated by the charging pile body, thereby ensuring that when each charging pile body operates, its temperature is within an appropriate range, improving the reliability of the charging pile body and extending the service life of the charging pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 FIG. is a system operation schematic diagram of a charging pile cooling system proposed in Embodiment 1 of the present invention;

[0026] Figure 2 FIG. is a structural diagram of a charging pile component of a charging pile cooling system proposed in Embodiment 1 of the present invention.

[0027] Reference numerals: 1, compressor; 2, condenser; 3, charging device; 3-1, solenoid valve; 3-2, expansion valve; 3-3, charging pile component; 4, gas-liquid separator; 5, charging pile body; 6, radiator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present invention in detail with reference to the embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0029] Embodiment 1

[0030] As Figure 1 shown, a charging pile cooling system includes an air compression device, a condensation device, a gas-liquid separation device, more than one group of charging devices 3, and a main control device. The outlet of the air compression device is connected to the inlet of the condensation device, the outlet of the condensation device is connected to the refrigerant inlet of the charging device 3, the refrigerant outlet of the charging device 3 is connected to the inlet of the gas-liquid separation device, the outlet of the gas-liquid separation device is connected to the inlet of the air compression device, the main control device is electrically connected to the charging device 3, the air compression device, and the condensation device, and the main control device is used to control the variable-frequency power of the condensation device and the rotational speed of the air compression device. More than one group of charging devices 3 are arranged in parallel.

[0031] Among them, the air compression device is the compressor 1, the condensation device is the condenser 2, the gas-liquid separation device is the gas-liquid separator 4, the main control device can be a processor storing an execution program, and the start and stop of the compressor 1, the condenser 2, and the gas-liquid separator 4 are all controlled by the processor. There are pipelines connecting between the compressor 1 and the condenser 2, between the condenser 2 and the charging device 3, between the charging device 3 and the gas-liquid separator 4, and between the gas-liquid separators 4, and a refrigeration gas circulates in the pipelines.

[0032] Specifically, the compressor 1 is used to compress the refrigerant gas at low temperature and low pressure into a refrigerant gas at high temperature and high pressure. Then, the refrigerant gas at high temperature and high pressure enters the condenser 2, and the condenser 2 uses a variable-frequency fan to exchange heat with the refrigerant gas. After that, the heat-exchanged refrigerant gas enters the charging device 3 to perform cooling and heat dissipation treatment on the charging device 3. After completing the cooling and heat dissipation treatment on the charging device 3, the charging device 3 discharges the refrigerant gas. At this time, the refrigerant gas contains a liquefied part. Therefore, it is necessary to achieve gas-liquid separation through the gas-liquid separator 4 and then enter the compressor 1 for compression treatment to achieve circulation. In this embodiment, multiple groups of charging devices 3 can be set, and each group of charging devices 3 is independent of each other and does not interfere with each other. For example, Figure 1 in the case of setting three groups of charging devices 3, three branch circuits are separated from the refrigerant outlet pipeline of the condenser 2 and are respectively connected to the refrigerant inlets of the three groups of charging devices 3 in a one-to-one correspondence, while the refrigerant outlets of the three groups of charging devices 3 are aggregated into one main circuit and connected to the refrigerant inlet pipeline of the gas-liquid separator 4.

[0033] For example, Figure 2 as shown, the charging device 3 includes a charging pile assembly 3-3 and an expansion valve 3-2. The expansion valve 3-2 is installed at the refrigerant inlet pipe of the charging pile assembly 3-3. The expansion valve 3-2 is used to control the magnitude of the refrigerant flow rate entering the charging pile assembly 3-3. The main control device is used to control the opening and closing of the expansion valve 3-2. The charging pile assembly 3-3 includes a charging pile body 5 and a radiator 6. The charging pile body 5 is installed on the side wall of the radiator 6. The radiator 6 is provided with a refrigerant inlet and a refrigerant outlet. Solenoid valves 3-1 are provided at both the refrigerant inlet pipe and the refrigerant outlet pipe of the charging pile assembly 3-3. The solenoid valves 3-1 are electrically connected to the main control device. The charging pile assembly 3-3 is also provided with a charging connection cable for charging

[0034] Among them, both the expansion valve 3-2 and the solenoid valve 3-1 are controlled by a processor. When the electric vehicle needs to be charged, the charging connection cable on the charging pile body 5 is connected to the electric vehicle through the charging interface, and then the charging pile body 5 is operated. At this time, with the start of the charging operation, the charging pile body 5 will generate heat. To protect the charging pile body 5 and enable it to be used more persistently, it is necessary to cool and dissipate the heat of the charging pile body 5. At this time, the radiator 6 is filled with coolant, so the radiator 6 realizes the cooling and heat dissipation treatment of the charging pile body 5 through the part in contact with the charging pile body 5. Since a heat-conducting material is provided between the charging pile body 5 and the radiator 6, the heat-conducting material plays a heat-conducting role, improving the heat dissipation efficiency of the charging pile body 5.

[0035] Furthermore, to improve the heat dissipation efficiency of the charging pile body 5, at this time, a heat exchange tube is provided on the radiator 6. The inlet and outlet of the heat exchange tube penetrate through the radiator 6, and the inlet of the heat exchange tube is connected to the outlet of the condenser 2, and the outlet of the heat exchange tube is connected to the inlet of the gas-liquid separator 4. That is, the high-temperature and high-pressure refrigerant gas discharged from the condenser 2 will enter the radiator 6 through the heat exchange tube, exchange heat with the cold coolant in the radiator 6, and then be discharged through the outlet of the heat exchange tube and enter the gas-liquid separator 4. Thus, the radiator 6 is heat-exchanged by the circulating refrigerant gas, and further the heat dissipation efficiency of the radiator 6 for the charging pile body 5 is improved. As Figure 2 shown in the charging pile assembly 3-3, the direction indicated by the upper arrow is the direction in which the refrigerating gas enters the inlet of the heat exchange tube, and the direction indicated by the lower arrow is the direction in which the refrigerating gas is discharged from the outlet of the heat exchange tube.

[0036] On the other hand, by providing an expansion valve 3-2 at the inlet of the heat exchange tube, the flow rate of the refrigerating gas is controlled through the expansion valve 3-2. When the temperature of the charging pile body 5 is different, the opening degree of the expansion valve 3-2 can be controlled, and the circulation rate of the refrigerating gas can be reasonably adjusted to achieve the heat exchange effect. The charging pile cooling system further includes a temperature detection component. The temperature detection component is arranged inside the charging pile body 5 or on the side wall of the charging pile body 5. The temperature detection component can be a temperature sensor, which can be built into the charging pile body 5 or externally arranged on the side wall of the charging pile body 5. Thus, through the temperature detection component, the temperature monitoring of the charging pile body 5 during the cooling and heat dissipation process is realized, and a basis for adjusting the opening degree of the expansion valve 3-2 is provided.

[0037] Embodiment 2

[0038] A charging pile cooling adjustment method, the cooling adjustment method is applied to the charging pile cooling system as described in Embodiment 1, and includes the following steps: obtaining the pre-adjustment opening value EEV of the expansion valve 3-2 i，j and the post-adjustment opening value EEV i，j+1 ; setting the standard temperature as T i，setThe difference between the standard temperature and ΔT 标准 , and calculate the temperature adjustment difference ΔT after the expansion valve 3-2 is adjusted 调节 , where the temperature adjustment difference after the expansion valve 3-2 is adjusted is calculated as ΔT 调节 =(EEV i，j+1 -EEV i，j ) / α, the temperature adjustment difference after the expansion valve 3-2 is adjusted can also be calculated as ΔT 调节 =T i，j -T i，set , where i represents the number of the charging pile body 5, which is a positive integer, j represents the jth adjustment of the expansion valve 3-2, which is also a positive integer, and α is an integer constant coefficient, i.e., EEV i，j The meaning is the opening value of the expansion valve 3-2 at the i-th charging pile body 5 after the j-th adjustment, EEV i，j+1 The meaning is the opening value of the expansion valve 3-2 at the i-th charging pile body 5 after the j+1th adjustment, T i，j The meaning is the temperature value detected by the temperature detection component of the expansion valve 3-2 at the i-th charging pile body 5 after the j-th adjustment, T i，set The meaning is the standard temperature set for the i-th charging pile body 5, so that the relationship between the opening value of the expansion valve 3-2 and the actual temperature of the charging pile body 5 can be obtained by combining the above two formulas, wherein the actual temperature of the charging pile body 5 is the temperature value detected by the temperature detection component.

[0039] Further, it is determined whether the temperature adjustment difference is within the standard temperature difference, wherein the standard temperature difference can be set to ±2°C, or can be adjusted according to actual conditions. After the opening value of the expansion valve 3-2 is adjusted once, the temperature adjustment difference ΔT is obtained. 调节 , and then determine whether to continue adjusting the expansion valve 3-2 or the condensing device and the air compressing device based on the judgment result. Specifically, if the temperature adjustment difference is within the standard temperature difference, there is no need to continue adjusting the expansion valve 3-2, the condensing device and the air compressing device; if the temperature adjustment difference is not within the standard temperature difference, and the expansion valve 3-2 has not reached the maximum opening value, then continue to adjust the expansion valve 3-2; if the temperature adjustment difference is not within the standard temperature difference, and the expansion valve 3-2 has reached the maximum opening value, then adjust the condensing device and the air compressing device so that the speed of the variable frequency fan of the condensing device and the air compressing device is set at the maximum speed, until the temperature adjustment difference adjusted for the last time is within the standard temperature difference.

[0040] The above are only the preferred embodiments of the present invention, and do not impose any formal or substantial limitations on the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the method of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. All those who are familiar with the technology in this field, without departing from the spirit and scope of the present invention, when making some equivalent changes such as minor modifications, decorations and evolutions using the technical content disclosed above, are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the substantial technology of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

1. A charging pile cooling system, characterized in that, It includes an air compression device, a condensation device, a gas-liquid separation device, more than one set of charging devices, and a main control device. The outlet of the air compression device is connected to the inlet of the condensation device. The outlet of the condensation device is connected to the refrigerant inlet of the charging device. The refrigerant outlet of the charging device is connected to the inlet of the gas-liquid separation device. The outlet of the gas-liquid separation device is connected to the inlet of the air compression device. The main control device is electrically connected to the charging device, the air compression device, and the condensation device, and the main control device is used to control the variable-frequency power of the condensation device and the rotation speed of the air compression device; The charging pile cooling system executes the following cooling adjustment method: Obtain the opening value before adjustment and the opening value after adjustment of the expansion valve; Set the standard temperature and the standard temperature difference, calculate the temperature adjustment difference after the expansion valve is adjusted, and determine whether the temperature adjustment difference is within the standard temperature difference. Among them, the calculation formula for the temperature adjustment difference is: , EEV i，j is the opening value of the expansion valve of the i-th charging pile body after the j-th adjustment, EEV i，j+1 means the opening value of the expansion valve of the i-th charging pile body after the (j + 1)-th adjustment, is an integer constant coefficient; According to the judgment result, judge whether to continue to adjust the expansion valve or adjust the condensation device and the air compression device, so that the temperature adjustment difference of the last adjustment is within the standard temperature difference.

2. The charging pile cooling system according to claim 1, characterized in that, The charging device includes a charging pile assembly and an expansion valve. The expansion valve is installed at the refrigerant inlet pipe of the charging pile assembly. The expansion valve is used to control the size of the refrigerant flow rate entering the charging pile assembly. The main control device is used to control the opening and closing of the expansion valve.

3. The charging pile cooling system according to claim 2, wherein The charging pile assembly includes a charging pile body and a radiator. The charging pile body is installed on the side wall of the radiator. The radiator is provided with a refrigerant inlet and a refrigerant outlet.

4. The charging pile cooling system according to claim 3, wherein, Solenoid valves are provided at both the refrigerant inlet pipe and the refrigerant outlet pipe of the charging pile assembly. The solenoid valves are electrically connected to the main control device.

5. The charging pile cooling system according to claim 3, characterized in that, A heat-conducting material is provided between the charging pile body and the radiator.

6. The charging pile cooling system according to claim 2, characterized in that, The charging pile assembly is also provided with a charging connection cable for charging.

7. The charging pile cooling system according to claim 2, characterized in that, It also includes a temperature detection component, and the temperature detection component is arranged inside the charging pile body or on the side wall of the charging pile body.

8. A charging pile cooling system according to claim 1, wherein, More than one set of the charging devices are arranged in parallel.

9. The charging pile cooling system according to claim 1, characterized in that, Judging whether to continue to adjust the expansion valve or adjust the condensation device and the air compression device according to the judgment result includes the following steps: If the temperature adjustment difference is within the standard temperature difference, there is no need to continue to adjust the expansion valve, the condensation device, and the air compression device; If the temperature adjustment difference is not within the standard temperature difference and the expansion valve has not reached the maximum opening value, continue to adjust the expansion valve; If the temperature adjustment difference is not within the standard temperature difference and the expansion valve has reached the maximum opening value, adjust the condensation device and the air compression device.

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