CN117183786B - Liquid cooling system of charging pile, control method and control device thereof - Google Patents
Liquid cooling system of charging pile, control method and control device thereof Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 330
- 238000001816 cooling Methods 0.000 title claims abstract description 192
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- 230000033228 biological regulation Effects 0.000 claims description 31
- 239000003507 refrigerant Substances 0.000 claims description 23
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- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention discloses a liquid cooling system of a charging pile, a control method and a control device thereof, wherein the system comprises: the water outlet of the water pump is connected with the water inlet of the liquid cooling power module of the charging pile; the water outlet of the water tank is connected with the water inlet of the water pump, and cooling liquid is stored in the water tank; the cooling liquid inlet is connected with the water outlet of the liquid cooling power module, and the cooling liquid outlet is connected with the water inlet of the water tank; the liquid outlet temperature sensor is arranged at the water outlet of the water pump and is used for collecting the liquid outlet temperature; the liquid cooling loops are connected in parallel, the N liquid cooling loops share one heat exchanger and one condenser, wherein the N liquid cooling loops are sequentially conducted according to the liquid outlet temperature and used for cooling the cooling liquid flowing into the heat exchanger, and N is a positive integer greater than or equal to 2. According to the liquid cooling system disclosed by the invention, the liquid cooling system is formed by adopting a plurality of liquid cooling loops which are connected in parallel, so that the refrigerating and heat dissipation effects are high, and the reliability of the system is high.
Description
Technical Field
The invention relates to the technical field of heat dissipation of charging piles, in particular to a liquid cooling system of a charging pile, a control method of the liquid cooling system and a control device of the liquid cooling system.
Background
Along with the development of new energy automobiles, the new energy automobiles are also more and more widespread, the charging pile is used as an indispensable supporting device of the new energy automobiles, and is one of key technologies for the development of the new energy automobiles, and the application and development of the new energy automobiles are directly influenced by the charging power and the charging speed of the charging pile. With the continuous increase of the power of the charging pile module, the temperature control of the charging pile module is more and more difficult.
In the related art, the charging pile module mostly adopts a passive air cooling heat dissipation technology or an active liquid cooling heat dissipation technology, wherein the cooling heat dissipation efficiency of the active liquid cooling heat dissipation technology is lower, and the reliability of the system is lower.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a liquid cooling system of a charging pile, which is formed by a plurality of liquid cooling loops connected in parallel, and has higher refrigerating and heat radiating effects and higher reliability.
The technical scheme adopted by the invention is as follows:
a liquid cooling system for a charging pile, comprising: the water outlet of the water pump is connected with the water inlet of the liquid cooling power module of the charging pile; the water outlet of the water tank is connected with the water inlet of the water pump, and cooling liquid is stored in the water tank; the cooling liquid inlet of the heat exchanger is connected with the water outlet of the liquid cooling power module, and the cooling liquid outlet of the heat exchanger is connected with the water inlet of the water tank; the liquid outlet temperature sensor is arranged at the water outlet of the water pump and is used for collecting the liquid outlet temperature; the liquid cooling loops are connected in parallel, the liquid cooling loops share one heat exchanger and one condenser, wherein the liquid cooling loops are sequentially conducted according to the liquid outlet temperature and used for cooling the cooling liquid flowing into the heat exchanger, and N is a positive integer greater than or equal to 2.
In one embodiment of the present invention, the liquid cooling system of the charging pile further includes: the liquid level sensor is arranged in the water tank and is used for collecting the liquid level of the water tank; the water tank temperature sensor is arranged in the water tank and used for collecting the temperature of the water tank; and the liquid inlet temperature sensor is arranged at a cooling liquid inlet of the heat exchanger and is used for collecting liquid inlet temperature.
In one embodiment of the present invention, the liquid cooling circuit includes: the inlet of the gas-liquid separator is connected with the refrigerant outlet of the heat exchanger; the inlet of the compressor is connected with the outlet of the gas-liquid separator, and the outlet of the compressor is connected with the refrigerant inlet of the condenser; the inlet of the electronic expansion valve is connected with the refrigerant outlet of the condenser, and the outlet of the electronic expansion valve is connected with the refrigerant inlet of the heat exchanger.
In one embodiment of the present invention, a refrigerant pipe between the inlet of the gas-liquid separator and the refrigerant outlet of the heat exchanger is configured as a heat-dissipating coil, wherein the liquid-cooling circuit further includes: and the compressor driver is arranged on the radiating coil pipe and is in communication connection with the compressor through a communication protocol.
In one embodiment of the present invention, the liquid cooling circuit further includes: the first temperature sensor is arranged at the inlet of the gas-liquid separator; the first pressure sensor is arranged at the inlet of the gas-liquid separator; the second pressure sensor is arranged at the inlet of the electronic expansion valve; the second temperature sensor is arranged at the outlet of the compressor; the environment temperature sensor is arranged corresponding to the condenser and is used for collecting the environment temperature of the environment where the condenser is located; the fan is arranged corresponding to the condenser, and the speed regulation temperature of the fan is the difference value between the temperature of the refrigerant acquired by the second temperature sensor and the ambient temperature.
In one embodiment of the present invention, the liquid cooling circuit further includes: the low-voltage switch is arranged at the inlet of the compressor; the high-voltage switch is arranged at the outlet of the compressor.
A control method of a liquid cooling system comprises the following steps: after the liquid cooling power module starts to work, judging whether the liquid level of the water tank is higher than a preset liquid level or not, and judging whether the temperature of the water tank is lower than a first preset temperature or not; if the water tank liquid level is higher than the preset liquid level and the water tank temperature is lower than the first preset temperature, driving the water pump to start working; after the water pump continuously works for a first preset time, judging whether the liquid outlet temperature is greater than or equal to a second preset temperature; and if the liquid outlet temperature is greater than or equal to the second preset temperature, controlling each liquid cooling loop to flexibly start to an operation working state in sequence until the liquid outlet temperature is less than the second preset temperature.
In one embodiment of the present invention, before controlling the flexible start of the liquid cooling loop in the ith step to the operation state, the method further includes: judging whether the liquid cooling loop in the ith part has faults or not, wherein i is a positive integer which is more than or equal to 1 and less than or equal to N; and if the ith liquid cooling loop has no fault, controlling the ith liquid cooling loop to flexibly start to the running working state.
In one embodiment of the present invention, determining whether the liquid cooling loop of the ith fails includes: judging whether the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve in the liquid cooling loop in the ith step are failed or not and whether the low-voltage switch and the high-voltage switch are triggered or not respectively; judging that the i-th liquid cooling loop has no fault if the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve have no fault and the low-voltage switch and the high-voltage switch are not triggered; otherwise, judging that the ith liquid cooling loop fails.
A control device of a liquid cooling system, comprising: the first judging module is used for judging whether the liquid level of the water tank is higher than a preset liquid level or not after the liquid cooling power module starts to work and judging whether the temperature of the water tank is lower than a first preset temperature or not; the driving module is used for driving the water pump to start working when the liquid level of the water tank is higher than the preset liquid level and the temperature of the water tank is lower than the first preset temperature; the second judging module is used for judging whether the liquid outlet temperature is greater than or equal to a second preset temperature after the water pump continuously works for a first preset time; and the control module is used for controlling each liquid cooling loop to be flexibly started to an operation working state in sequence when the liquid outlet temperature is greater than or equal to the second preset temperature until the liquid outlet temperature is less than the second preset temperature.
The invention has the beneficial effects that:
the invention adopts a plurality of liquid cooling loops connected in parallel to form a liquid cooling system, so that the refrigerating and heat dissipation effects are higher, and the reliability of the system is higher.
Drawings
Fig. 1 is a schematic structural diagram of a liquid cooling system of a charging pile according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method of a liquid cooling system according to an embodiment of the present invention;
fig. 3 is a block diagram of a control device of a liquid cooling system according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a liquid cooling system of a charging pile according to an embodiment of the present invention.
As shown in fig. 1, the liquid cooling system of the charging pile according to the embodiment of the present invention may include: the water pump 100, the water tank 200, the heat exchanger 300, the liquid outlet temperature sensor 400, and N liquid cooling loops 500 (only two are shown in the figure) connected in parallel.
Wherein, the water outlet of the water tank 200 is connected with the water inlet of the water pump 100, and the water tank 200 stores cooling liquid; the cooling liquid inlet of the heat exchanger 300 is connected with the water outlet of the liquid cooling power module, and the cooling liquid outlet of the heat exchanger 300 is connected with the water inlet of the water tank 200; the liquid outlet temperature sensor 400 is arranged at the water outlet of the water pump 100 and is used for collecting the liquid outlet temperature; the N liquid cooling circuits 500 share one heat exchanger 300 and one condenser 510, where the N liquid cooling circuits 500 are sequentially turned on according to the liquid outlet temperature, and are used for cooling the cooling liquid flowing into the heat exchanger 300, and N is a positive integer greater than or equal to 2.
Specifically, when the target charging pile is radiating, the water pump 100 may be driven to start to operate, so that the cooling liquid in the water tank 200 flows into the liquid cooling power module, and the target charging pile is radiating through the liquid cooling power module. When the liquid outlet temperature collected by the liquid outlet temperature sensor 400 is too high, that is, the liquid outlet temperature is greater than or equal to the second preset temperature, it indicates that the temperature of the cooling liquid flowing out of the water outlet of the water tank 200 is higher, and the heat dissipation requirement of the target charging pile cannot be met, and at this time, the cooling liquid flowing through the heat exchanger 300 can be cooled by the liquid cooling loop 500.
Specifically, the N liquid cooling loops can be controlled to be sequentially turned on according to the liquid outlet temperature, so as to cool the cooling liquid flowing into the heat exchanger until the liquid outlet temperature is less than a second preset temperature.
In one embodiment of the present invention, as shown in fig. 1, the liquid cooling system of the charging pile further includes: level sensor 600, tank temperature sensor 700, and inlet temperature sensor 800.
Wherein, the liquid level sensor 600 is arranged in the water tank 200 for collecting the liquid level of the water tank; the water tank temperature sensor 700 is provided in the water tank 200 for collecting the water tank temperature; the inlet temperature sensor 800 is disposed at a cooling liquid inlet of the heat exchanger 300, and is used for collecting inlet temperature.
Specifically, after the liquid cooling power module starts to work, it can first determine whether the water tank liquid level is higher than a preset liquid level, and determine whether the water tank temperature is lower than a first preset temperature, if the water tank liquid level is higher than the preset liquid level and the water tank temperature is lower than the first preset temperature, the water pump 100 is driven to start to work, and if the water tank liquid level is not higher than the preset liquid level and the water tank temperature is not lower than the first preset temperature, the reset is waited.
In one embodiment of the present invention, as shown in FIG. 1, a liquid cooling circuit 500 may include: a gas-liquid separator 520, a compressor 530, and an electronic expansion valve 540.
Wherein, the inlet of the gas-liquid separator 520 is connected with the refrigerant outlet of the heat exchanger 300; an inlet of the compressor 530 is connected to an outlet of the gas-liquid separator 520, an outlet of the compressor 530 is connected to a refrigerant inlet of the condenser 510, an electronic expansion valve 540 is connected to an inlet of the electronic expansion valve 540 is connected to a refrigerant outlet of the condenser 510, and an outlet of the electronic expansion valve 540 is connected to a refrigerant inlet of the heat exchanger 300.
Specifically, the gas-liquid separator 520, the compressor 530 and the electronic expansion valve 540 form a liquid cooling loop 500, wherein the refrigerant circulates in the liquid cooling loop 500 and cools the cooling liquid flowing into the heat exchanger 300, thereby reducing the temperature of the cooling liquid flowing back to the water tank 200, so that the temperature of the cooling liquid flowing out from the water outlet of the water tank 200 meets the heat dissipation requirement of the target charging pile, i.e. the liquid outlet temperature is smaller than the second preset temperature.
In one embodiment of the present invention, as shown in fig. 1, a refrigerant pipe between an inlet of the gas-liquid separator 520 and a refrigerant outlet of the heat exchanger 300 is configured as a heat-dissipating coil, wherein the liquid-cooling circuit 500 further includes: a compressor driver 550. Wherein, compressor driver 550 is disposed on the heat-dissipating coil, and compressor driver 550 is communicatively coupled to compressor 530 via a communication protocol.
Specifically, the compressor driver 550 for controlling the operation of the compressor 530, for example, the frequency conversion operation, is provided on the heat radiation coil, and can effectively radiate heat from the compressor driver 550. Wherein, the working frequency of the compressor 530 can be adjusted according to the liquid outlet temperature collected by the liquid outlet temperature sensor 400. The communication protocol may include RS 485/RS 232/CAN, etc.
Specifically, when the compressor 530 starts to operate, it is first determined whether the compressor 530 is in an operating state. If not, the speed control logic of compressor 530 is exited; if so, further judging whether the liquid outlet temperature is higher than a third preset temperature. If the temperature is greater than the third preset temperature, the compressor driver 550 interacts with the compressor 530 through RS485 to rapidly raise the frequency; if the temperature is less than or equal to the third preset temperature, further judging whether the liquid outlet temperature is greater than the fourth preset temperature. If the outlet temperature is greater than the fourth preset temperature, the compressor driver 550 interacts with the compressor 530 through RS485, slowly increasing the frequency; if the temperature is smaller than or equal to the fourth preset temperature, further judging whether the liquid outlet temperature is in a first temperature change range (a temperature range of plus or minus 1 ℃ of the fifth preset temperature) corresponding to the fifth preset temperature. If it is within the first temperature variation range, the compressor driver 550 interacts with the compressor 530 through RS485, with a constant frequency; if the temperature is not in the first temperature variation range, further judging whether the temperature of the liquid outlet is higher than a sixth preset temperature. If the temperature is greater than the sixth preset temperature, the compressor driver 550 interacts with the compressor 530 through RS485, slowly down-converting; if less than or equal to the sixth preset temperature, the compressor driver 550 interacts with the compressor 530 through RS485, rapidly down-converting. Wherein the second preset temperature is less than the third preset temperature, the fourth preset temperature is greater than the second preset temperature and less than the third preset temperature, the sixth preset temperature is less than the second preset temperature, the difference between the fifth preset temperature and the second preset temperature is ±1 degree, for example, the second preset temperature is 35 ℃, the third preset temperature is 38 ℃, the fourth preset temperature is 36 ℃, the fifth preset temperature is 34 ℃ or 36 ℃, and the sixth preset temperature is 32 ℃.
In one embodiment of the present invention, as shown in fig. 1, the liquid cooling circuit 500 further includes: a first temperature sensor 560, a first pressure sensor 570, a second pressure sensor 580, a second temperature sensor 590, an ambient temperature sensor 5100 and a fan 5110.
Wherein the first temperature sensor 560 is disposed at an inlet of the gas-liquid separator 520; the first pressure sensor 570 is disposed at an inlet of the gas-liquid separator 520; a second pressure sensor 580 is provided at the inlet of the electronic expansion valve 540; a second temperature sensor 590 is disposed at an outlet of the compressor 530; the ambient temperature sensor 5100 is disposed corresponding to the condenser 510 and is configured to collect an ambient temperature of an environment in which the condenser 510 is located; the fan 5110 is disposed corresponding to the condenser 510, wherein the speed regulation temperature of the fan 5110 is a difference between the refrigerant temperature collected by the second temperature sensor 590 and the ambient temperature.
Specifically, after the fan 5110 starts to operate, it is first determined whether the fan 5110 is in an operating state, if not, the speed regulation control logic of the fan 5110 is exited; if so, it is further determined whether the throttle temperature of the fan 5110 is greater than the first throttle temperature. If the speed regulation temperature is greater than the first speed regulation temperature, the fan 5110 is controlled to rapidly rise, and if the speed regulation temperature is less than or equal to the first speed regulation temperature, whether the speed regulation temperature is greater than the second speed regulation temperature is further judged. If the speed regulation temperature is greater than the second speed regulation temperature, the fan 5110 is controlled to slowly rise; if the speed regulation temperature is less than or equal to the second speed regulation temperature, it is further determined whether the speed regulation temperature of the fan 5110 is greater than the third speed regulation temperature. If the speed regulation temperature is higher than the third speed regulation temperature, controlling the rotation speed of the fan 5110 to be unchanged; if the speed is less than or equal to the third speed, it is further determined whether the speed of the fan 5110 is greater than the fourth speed. If the speed regulation temperature is greater than the fourth speed regulation temperature, the fan 5110 is controlled to slow down. Wherein the first speed regulation temperature is greater than the second speed regulation temperature, the second speed regulation temperature is greater than the third speed regulation temperature, and the third speed regulation temperature is greater than the fourth speed regulation temperature.
The pressure value collected by the first pressure sensor 570 is converted into a corresponding evaporation temperature, and a difference between the temperature value collected by the first temperature sensor 560 and the evaporation temperature is calculated, so as to obtain the superheat degree of the liquid cooling circuit 500. When the electronic expansion valve 540 starts to operate, it is first determined whether the electronic expansion valve 540 is in an operating state. If not, exiting the speed regulation control logic of the electronic expansion valve 540, and maintaining the initial opening degree of the electronic expansion valve 540; if so, it is further determined whether the degree of superheat of the liquid cooling circuit 500 is greater than the first degree of superheat. If the superheat degree of the liquid cooling loop 500 is greater than the first superheat degree, the electronic expansion valve 540 is driven to rapidly increase the opening degree; if the degree of superheat of the liquid cooling circuit 500 is less than or equal to the first degree of superheat, it is further determined whether the degree of superheat of the liquid cooling circuit 500 is greater than the second degree of superheat. If the superheat degree of the liquid cooling loop 500 is greater than the second superheat degree, the electronic expansion valve 540 is driven to slowly increase the opening degree; if the degree of superheat of the liquid cooling circuit 500 is less than or equal to the second degree of superheat, it is further determined whether the degree of superheat of the liquid cooling circuit 500 is greater than the third degree of superheat. If the degree of superheat of the liquid cooling circuit 500 is greater than the third degree of superheat, the opening of the electronic expansion valve 540 is driven to be unchanged; if the degree of superheat of the liquid cooling circuit 500 is less than or equal to the third degree of superheat, it is further determined whether the degree of superheat of the liquid cooling circuit 500 is greater than the fourth degree of superheat. If the degree of superheat of the liquid cooling circuit 500 is greater than the fourth degree of superheat, the electronic expansion valve 540 is driven to slowly decrease the opening; if the degree of superheat of the liquid cooling circuit 500 is less than or equal to the fourth degree of superheat, the electronic expansion valve 540 is driven to rapidly decrease the opening degree. Wherein the first degree of superheat is greater than the second degree of superheat, the second degree of superheat is greater than the third degree of superheat, and the third degree of superheat is greater than the fourth degree of superheat.
In one embodiment of the present invention, as shown in fig. 1, the liquid cooling circuit 500 further includes: a low voltage switch 5120 and a high voltage switch 5130. Wherein, the low-pressure switch 5120 is disposed at an inlet of the compressor 530, and the high-pressure switch 5130 is disposed at an outlet of the compressor 530.
Specifically, before the liquid cooling circuit 500 operates, it may be determined whether the liquid cooling circuit 500 has failed, specifically, whether the first temperature sensor 560, the second temperature sensor 590, the first pressure sensor 570, the second pressure sensor 580, the compressor 530, the fan 5110, and the electronic expansion valve 540 have failed, and whether the low-voltage switch 5120 and the high-voltage switch 5130 have been triggered, respectively. If none of the first temperature sensor 560, the second temperature sensor 590, the first pressure sensor 570, the second pressure sensor 580, the compressor 530, the fan 5110, and the electronic expansion valve 540 fails, and the low-pressure switch 5120 and the high-pressure switch 5130 are not triggered, it is determined that the liquid cooling circuit 500 does not fail.
Therefore, the liquid cooling system can adjust the refrigerant flow of the liquid cooling system in a stepless manner according to the temperature change of the detection temperature point of the liquid cooling power module of the high-power charging pile, compared with a single-compressor liquid cooling system, the reliability is higher, when a certain compressor fails, other compressors can still work normally, the operation efficiency is high, most of the refrigerating system is used for selecting the compressor according to the worst working condition, the refrigerating system actually operates in a half-load working condition in most of time, the COP value of the 1+N liquid cooling system can be completely the same as that of the full-load working condition under the same working condition, the COP value of the single-compressor liquid cooling system is reduced by more than half under the working condition, in addition, compared with the single-compressor liquid cooling system, the single-compressor liquid cooling system is more efficient and energy-saving, the refrigerating capacity can be selected according to the requirement, the combination of a plurality of compressors can provide multi-stage energy adjustment, the plurality of compressors can be matched with the actual load more smoothly and dynamically, thereby realizing the optimal energy adjustment of the load change, the regulation linearity is higher, in addition, the liquid cooling system and the high-power charging pile liquid cooling power module are required to be connected with the high-power charging pile liquid cooling pipeline to be in a production joint, the COP value is ensured, the service life of the high-power charging pile is prolonged, and the service life of the high-power charging pile is protected, and the service life of the air is protected.
In summary, according to the liquid cooling system of the charging pile provided by the embodiment of the invention, the water outlet of the water pump is connected with the water inlet of the liquid cooling power module of the charging pile, the water outlet of the water tank is connected with the water inlet of the water pump, the cooling liquid is stored in the water tank, the cooling liquid inlet of the heat exchanger is connected with the water outlet of the liquid cooling power module, the cooling liquid outlet of the heat exchanger is connected with the water inlet of the water tank, the liquid outlet temperature sensor is arranged at the water outlet of the water pump and is used for collecting the liquid outlet temperature, the N liquid cooling loops share one heat exchanger and one condenser, wherein the N liquid cooling loops are sequentially conducted according to the liquid outlet temperature and are used for cooling the cooling liquid flowing into the heat exchanger, and N is a positive integer greater than or equal to 2. Therefore, a plurality of liquid cooling loops connected in parallel form a liquid cooling system, so that the refrigerating and heat dissipation effects are high, and the reliability of the system is high.
Corresponding to the liquid cooling system of the above embodiment, the invention further provides a control method of the liquid cooling system.
As shown in fig. 2, the control method of the liquid cooling system according to the embodiment of the invention may include the following steps:
s1, after the liquid cooling power module starts to work, judging whether the liquid level of the water tank is higher than a preset liquid level or not, and judging whether the temperature of the water tank is lower than a first preset temperature or not.
S2, if the liquid level of the water tank is higher than the preset liquid level and the temperature of the water tank is lower than the first preset temperature, driving the water pump to start working.
Specifically, after the liquid cooling power module starts to work, firstly judging whether the liquid level of the water tank is higher than a preset liquid level, judging whether the temperature of the water tank is lower than a first preset temperature, if the liquid level of the water tank is lower than the preset liquid level or the temperature of the water tank is higher than the first preset temperature, indicating that the cooling liquid in the water tank is insufficient or the temperature of the water tank is abnormal, and waiting for reset at the moment; if the water tank liquid level is higher than the preset liquid level and the water tank temperature is lower than the first preset temperature, the water pump is driven to start working.
And S3, after the water pump continuously works for a first preset time, judging whether the temperature of the liquid outlet is greater than or equal to a second preset temperature.
And S4, if the liquid outlet temperature is greater than or equal to the second preset temperature, controlling each liquid cooling loop to flexibly start to an operation working state in sequence until the liquid outlet temperature is less than the second preset temperature.
After the water pump continuously works for a first preset time, judging whether the temperature of the liquid outlet is greater than or equal to a second preset temperature. If the temperature of the discharged liquid is smaller than the second preset temperature, the temperature of the cooling liquid flowing out of the water outlet of the water tank 200 can meet the heat dissipation requirement of the target charging pile; if the temperature of the liquid outlet is greater than or equal to the second preset temperature, it indicates that the temperature of the cooling liquid flowing out from the water outlet of the water tank 200 is higher, and the heat dissipation requirement of the target charging pile cannot be met, at this time, each liquid cooling loop is controlled to be flexibly started to an operation working state in sequence until the temperature of the liquid outlet is less than the second preset temperature.
It should be noted that, in one embodiment of the present invention, before controlling the flexible start of the ith liquid cooling loop to the operation state, the method further includes: judging whether the ith liquid cooling loop fails, wherein i is a positive integer which is more than or equal to 1 and less than or equal to N; and if the ith liquid cooling loop has no fault, controlling the flexible start of the ith liquid cooling loop to an operation working state.
Wherein, judge whether ith liquid cooling loop breaks down, include: judging whether a first temperature sensor, a second temperature sensor, a first pressure sensor, a second pressure sensor, a compressor, a fan and an electronic expansion valve in the ith liquid cooling loop are in failure or not and whether a low-voltage switch and a high-voltage switch are triggered or not respectively; if the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve are not failed, and the low-voltage switch and the high-voltage switch are not triggered, judging that the ith liquid cooling loop is not failed; otherwise, judging that the ith liquid cooling loop fails.
Specifically, whether the first liquid cooling loop fails or not is firstly judged, and if the first liquid cooling loop does not fail, an electronic expansion valve in the first liquid cooling loop is driven to initialize and open to an initial opening degree. After the initialization of the electronic expansion valve in the first liquid cooling loop is completed, driving a fan in the first liquid cooling loop to run for a second preset time, driving a compressor in the first liquid cooling loop to run at the minimum rotating speed after the fan in the first liquid cooling loop runs for the second preset time, and entering an operation working state after the compressor in the first liquid cooling loop runs for a third preset time at the minimum rotating speed, wherein the electronic expansion valve enters the operation working state, and the fan synchronously enters the operation working state, so that the flexible start of the first liquid cooling loop is realized, and the system enters the single-compressor operation working state. When the system works in a single-compressor working state, judging whether the rotating speed of the compressor in the first liquid cooling loop is larger than or equal to a first rotating speed (the first rotating speed is the optimal working rotating speed of the compressor, namely the working rotating speed corresponding to the optimal energy efficiency ratio, wherein the energy efficiency ratio is the ratio of output refrigerating capacity to input power, and the optimal energy efficiency ratio is obtained by testing different environment temperatures and machine target temperatures of the compressor in actual operation), and if not, controlling the compressor to continue to operate until the compressor is operated to the first rotating speed; if so, judging that the liquid outlet temperature is smaller than a second preset temperature, judging whether the second liquid cooling loop fails or not when the liquid outlet temperature is larger than or equal to the second preset temperature, and if not, driving an electronic expansion valve in the second liquid cooling loop to initialize and opening to an initial opening degree. After the initialization of the electronic expansion valve in the second liquid cooling loop is completed, driving a fan in the second liquid cooling loop to run for a second preset time, driving a compressor in the second liquid cooling loop to run at the minimum rotating speed after the fan in the second liquid cooling loop runs for the second preset time, and entering an operation working state after the compressor in the second liquid cooling loop runs for a third preset time at the minimum rotating speed, wherein the electronic expansion valve enters the operation working state, and the fan synchronously enters the operation working state, so that flexible starting of the second liquid cooling loop is realized, and the system enters the double-compressor operation working state. When the system works in the working state of the double compressors, the liquid outlet temperature is judged to be smaller than the second preset temperature, and when the liquid outlet temperature is larger than or equal to the second preset temperature, the flexible start of the third liquid cooling loop is continuously controlled, and the like until the liquid outlet temperature is smaller than the second preset temperature.
In summary, according to the control method of the liquid cooling system in the embodiment of the invention, after the liquid cooling power module starts to work, whether the liquid level of the water tank is higher than the preset liquid level is judged, whether the temperature of the water tank is lower than the first preset temperature is judged, if the liquid level of the water tank is higher than the preset liquid level and the temperature of the water tank is lower than the first preset temperature, the water pump is driven to start to work, after the water pump continuously works for the first preset time, whether the liquid outlet temperature is higher than or equal to the second preset temperature is judged, and if the liquid outlet temperature is higher than or equal to the second preset temperature, each liquid cooling loop is controlled to be flexibly started to the running working state in sequence until the liquid outlet temperature is lower than the second preset temperature. Therefore, a plurality of liquid cooling loops connected in parallel form a liquid cooling system, so that the refrigerating and heat dissipation effects are high, and the reliability of the system is high.
Corresponding to the control method of the liquid cooling system in the embodiment, the invention further provides a control device of the liquid cooling system.
As shown in fig. 3, a control device of a liquid cooling system according to an embodiment of the present invention may include: a first judgment module 1000, a driving module 2000, a second judgment module 3000, and a control module 4000.
The first judging module 1000 is configured to judge whether the liquid level of the water tank is higher than a preset liquid level after the liquid cooling power module starts to work, and judge whether the temperature of the water tank is lower than a first preset temperature; the driving module 2000 is used for driving the water pump to start working when the water tank liquid level is higher than the preset liquid level and the water tank temperature is lower than the first preset temperature; the second judging module 3000 is configured to judge whether the temperature of the liquid outlet is greater than or equal to a second preset temperature after the water pump is continuously operated for a first preset time; the control module 4000 is configured to control each liquid cooling loop to flexibly start to an operating state in sequence when the liquid outlet temperature is greater than or equal to a second preset temperature until the liquid outlet temperature is less than the second preset temperature.
In one embodiment of the present invention, the control module 4000 is further configured to, before controlling the flexible start of the ith liquid cooling circuit to the operation state: judging whether the ith liquid cooling loop fails, wherein i is a positive integer which is more than or equal to 1 and less than or equal to N; and if the ith liquid cooling loop has no fault, controlling the flexible start of the ith liquid cooling loop to an operation working state.
In one embodiment of the present invention, the control module 4000 is specifically further configured to: judging whether a first temperature sensor, a second temperature sensor, a first pressure sensor, a second pressure sensor, a compressor, a fan and an electronic expansion valve in the ith liquid cooling loop are in failure or not and whether a low-voltage switch and a high-voltage switch are triggered or not respectively; if the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve are not failed, and the low-voltage switch and the high-voltage switch are not triggered, judging that the ith liquid cooling loop is not failed; otherwise, judging that the ith liquid cooling loop fails.
The specific embodiments of the control device for a liquid cooling system according to the present invention may refer to the embodiments of the control method for a liquid cooling system described above, and in order to avoid redundancy, details thereof will not be described herein.
According to the control device of the liquid cooling system, after the liquid cooling power module starts to work, the first judging module judges whether the liquid level of the water tank is higher than the preset liquid level and judges whether the temperature of the water tank is lower than the first preset temperature, when the liquid level of the water tank is higher than the preset liquid level and the temperature of the water tank is lower than the first preset temperature, the driving module drives the water pump to start to work, and after the water pump continuously works for the first preset time, the second judging module judges whether the liquid outlet temperature is higher than or equal to the second preset temperature, and when the liquid outlet temperature is higher than or equal to the second preset temperature, the control module controls each liquid cooling loop to flexibly start to an operation state in sequence until the liquid outlet temperature is lower than the second preset temperature. Therefore, a plurality of liquid cooling loops connected in parallel form a liquid cooling system, so that the refrigerating and heat dissipation effects are high, and the reliability of the system is high.
The order of execution of the steps illustrated in the flowcharts is a preferred implementation, and in other embodiments of the present invention, the functions involved in the steps may be adjusted, for example, may be executed simultaneously or in reverse order.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
Claims (8)
1. A liquid cooling system of a charging pile, comprising:
the water outlet of the water pump is connected with the water inlet of the liquid cooling power module of the charging pile;
the water outlet of the water tank is connected with the water inlet of the water pump, and cooling liquid is stored in the water tank;
the cooling liquid inlet of the heat exchanger is connected with the water outlet of the liquid cooling power module, and the cooling liquid outlet of the heat exchanger is connected with the water inlet of the water tank;
the liquid outlet temperature sensor is arranged at the water outlet of the water pump and is used for collecting the liquid outlet temperature;
the liquid cooling loops are connected in parallel, the N liquid cooling loops share one heat exchanger and one condenser, wherein the N liquid cooling loops are sequentially conducted according to the liquid outlet temperature and are used for cooling the cooling liquid flowing into the heat exchanger, and N is a positive integer greater than or equal to 2; wherein, the liquid cooling loop includes:
the inlet of the gas-liquid separator is connected with the refrigerant outlet of the heat exchanger;
the inlet of the compressor is connected with the outlet of the gas-liquid separator, and the outlet of the compressor is connected with the refrigerant inlet of the condenser;
the inlet of the electronic expansion valve is connected with the refrigerant outlet of the condenser, the outlet of the electronic expansion valve is connected with the refrigerant inlet of the heat exchanger, a refrigerant pipeline between the inlet of the gas-liquid separator and the refrigerant outlet of the heat exchanger is set as a heat dissipation coil, and the liquid cooling loop further comprises: the compressor driver is arranged on the radiating coil pipe and is in communication connection with the compressor through a communication protocol; after the compressor starts to run, judging whether the compressor is in a running working state, and if not, exiting the speed regulation control logic of the compressor; if so, further judging whether the liquid outlet temperature is higher than a third preset temperature; if the temperature is higher than the third preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly raise the frequency; if the temperature is less than or equal to the third preset temperature, further judging whether the liquid outlet temperature is greater than the fourth preset temperature; if the temperature of the liquid outlet is higher than the fourth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and the frequency is increased slowly; if the temperature is less than or equal to the fourth preset temperature, further judging whether the liquid outlet temperature is in a first temperature change range corresponding to the fifth preset temperature; if the temperature is within the first temperature variation range, the compressor driver interacts with the compressor through a communication protocol, and the frequency is unchanged; if the temperature is not in the first temperature variation range, further judging whether the temperature of the liquid outlet is higher than a sixth preset temperature or not; if the temperature is higher than the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and frequency is reduced slowly; if the temperature is less than or equal to the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly reduce the frequency; the second preset temperature is smaller than the third preset temperature, the fourth preset temperature is larger than the second preset temperature and smaller than the third preset temperature, the sixth preset temperature is smaller than the second preset temperature, and the difference value between the fifth preset temperature and the second preset temperature is +/-1 degree.
2. The liquid cooling system of a charging pile according to claim 1, further comprising:
the liquid level sensor is arranged in the water tank and is used for collecting the liquid level of the water tank;
the water tank temperature sensor is arranged in the water tank and used for collecting the temperature of the water tank;
and the liquid inlet temperature sensor is arranged at a cooling liquid inlet of the heat exchanger and is used for collecting liquid inlet temperature.
3. The liquid cooling system of a charging pile according to claim 2, wherein the liquid cooling circuit further comprises:
the first temperature sensor is arranged at the inlet of the gas-liquid separator;
the first pressure sensor is arranged at the inlet of the gas-liquid separator;
the second pressure sensor is arranged at the inlet of the electronic expansion valve;
the second temperature sensor is arranged at the outlet of the compressor;
the environment temperature sensor is arranged corresponding to the condenser and is used for collecting the environment temperature of the environment where the condenser is located;
the fan is arranged corresponding to the condenser, and the speed regulation temperature of the fan is the difference value between the temperature of the refrigerant acquired by the second temperature sensor and the ambient temperature.
4. A liquid cooling system for a charging pile according to claim 3, wherein the liquid cooling circuit further comprises:
the low-voltage switch is arranged at the inlet of the compressor;
the high-voltage switch is arranged at the outlet of the compressor.
5. A control method of a liquid cooling system according to claim 4, comprising the steps of:
after the liquid cooling power module starts to work, judging whether the liquid level of the water tank is higher than a preset liquid level or not, and judging whether the temperature of the water tank is lower than a first preset temperature or not;
if the water tank liquid level is higher than the preset liquid level and the water tank temperature is lower than the first preset temperature, driving the water pump to start working;
after the water pump continuously works for a first preset time, judging whether the liquid outlet temperature is greater than or equal to a second preset temperature;
if the liquid outlet temperature is greater than or equal to the second preset temperature, controlling each liquid cooling loop to flexibly start to an operation working state in sequence until the liquid outlet temperature is less than the second preset temperature; after the compressor starts to run, judging whether the compressor is in a running working state, and if not, exiting the speed regulation control logic of the compressor; if so, further judging whether the liquid outlet temperature is higher than a third preset temperature; if the temperature is higher than the third preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly raise the frequency; if the temperature is less than or equal to the third preset temperature, further judging whether the liquid outlet temperature is greater than the fourth preset temperature; if the temperature of the liquid outlet is higher than the fourth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and the frequency is increased slowly; if the temperature is less than or equal to the fourth preset temperature, further judging whether the liquid outlet temperature is in a first temperature change range corresponding to the fifth preset temperature; if the temperature is within the first temperature variation range, the compressor driver interacts with the compressor through a communication protocol, and the frequency is unchanged; if the temperature is not in the first temperature variation range, further judging whether the temperature of the liquid outlet is higher than a sixth preset temperature or not; if the temperature is higher than the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and frequency is reduced slowly; if the temperature is less than or equal to the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly reduce the frequency; the second preset temperature is smaller than the third preset temperature, the fourth preset temperature is larger than the second preset temperature and smaller than the third preset temperature, the sixth preset temperature is smaller than the second preset temperature, and the difference value between the fifth preset temperature and the second preset temperature is +/-1 degree.
6. The method according to claim 5, further comprising, before controlling the flexible start of the i-th liquid cooling circuit to the operation state:
judging whether the liquid cooling loop in the ith part has faults or not, wherein i is a positive integer which is more than or equal to 1 and less than or equal to N;
and if the ith liquid cooling loop has no fault, controlling the ith liquid cooling loop to flexibly start to the running working state.
7. The method according to claim 6, wherein determining whether the i-th liquid cooling circuit has failed comprises:
judging whether the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve in the liquid cooling loop in the ith step are failed or not and whether the low-voltage switch and the high-voltage switch are triggered or not respectively;
judging that the i-th liquid cooling loop has no fault if the first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the compressor, the fan and the electronic expansion valve have no fault and the low-voltage switch and the high-voltage switch are not triggered;
otherwise, judging that the ith liquid cooling loop fails.
8. A control device for a liquid cooling system according to claim 4, comprising:
the first judging module is used for judging whether the liquid level of the water tank is higher than a preset liquid level or not after the liquid cooling power module starts to work and judging whether the temperature of the water tank is lower than a first preset temperature or not;
the driving module is used for driving the water pump to start working when the liquid level of the water tank is higher than the preset liquid level and the temperature of the water tank is lower than the first preset temperature;
the second judging module is used for judging whether the liquid outlet temperature is greater than or equal to a second preset temperature after the water pump continuously works for a first preset time;
the control module is used for controlling each liquid cooling loop to be flexibly started to an operation working state in sequence when the liquid outlet temperature is greater than or equal to the second preset temperature until the liquid outlet temperature is less than the second preset temperature, wherein after the compressor starts to operate, judging whether the compressor is in the operation working state, and if not, exiting the speed regulation control logic of the compressor; if so, further judging whether the liquid outlet temperature is higher than a third preset temperature; if the temperature is higher than the third preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly raise the frequency; if the temperature is less than or equal to the third preset temperature, further judging whether the liquid outlet temperature is greater than the fourth preset temperature; if the temperature of the liquid outlet is higher than the fourth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and the frequency is increased slowly; if the temperature is less than or equal to the fourth preset temperature, further judging whether the liquid outlet temperature is in a first temperature change range corresponding to the fifth preset temperature; if the temperature is within the first temperature variation range, the compressor driver interacts with the compressor through a communication protocol, and the frequency is unchanged; if the temperature is not in the first temperature variation range, further judging whether the temperature of the liquid outlet is higher than a sixth preset temperature or not; if the temperature is higher than the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol, and frequency is reduced slowly; if the temperature is less than or equal to the sixth preset temperature, the compressor driver interacts with the compressor through a communication protocol to quickly reduce the frequency; the second preset temperature is smaller than the third preset temperature, the fourth preset temperature is larger than the second preset temperature and smaller than the third preset temperature, the sixth preset temperature is smaller than the second preset temperature, and the difference value between the fifth preset temperature and the second preset temperature is +/-1 degree.
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