CN110712553A

CN110712553A - Direct current charger

Info

Publication number: CN110712553A
Application number: CN201911106136.XA
Authority: CN
Inventors: 曹宇; 顾进飞; 窦胜; 余静; 屈战; 李美红; 缪晓汶
Original assignee: Nanjing Nengrui Electric Power Technology Co Ltd
Current assignee: Nanjing Nengrui Electric Power Technology Co Ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-01-21
Anticipated expiration: 2039-11-13
Also published as: CN110712553B

Abstract

The embodiment of the invention discloses a direct-current charger, which comprises a charging system and a heat dissipation system, wherein the charging system and the heat dissipation system are connected through a liquid outlet pipe and a liquid inlet pipe; the charging system comprises a closed module bin, and at least one power module and cooling liquid which are arranged in the closed module bin; the heat dissipation system comprises a control module, a signal acquisition module and a heat dissipation execution module; the signal acquisition module at least comprises a liquid outlet pipe temperature acquisition unit; the heat dissipation execution module at least comprises a first circulation heat dissipation unit and a second circulation heat dissipation unit; the control module is respectively connected with the liquid outlet pipe temperature acquisition unit, the first circulating heat dissipation unit and the second circulating heat dissipation unit and is used for controlling the first circulating heat dissipation unit or the second circulating heat dissipation unit to work according to the first temperature information acquired by the liquid outlet pipe temperature acquisition unit. In conclusion, different heat dissipation modes are adopted according to the temperature of the cooling liquid in the liquid outlet pipe, so that the heat dissipation requirement is met, and meanwhile, the power consumption of a heat dissipation system is reduced.

Description

Direct current charger

Technical Field

The embodiment of the invention relates to the technical field of electric automobile charging, in particular to a direct current charger.

Background

The direct current charger has the advantages of high power, high output current, short charging time and the like, so that the direct current charger is widely applied to places such as public transportation stations and external operation charging stations to provide charging services for electric vehicles. However, because the charging module has large heat productivity in a short time, the traditional air-cooled direct-current charger cooled by the fan is difficult to meet the heat dissipation requirement.

Under the general condition, in order to improve the heat dispersion of the charger, a heat radiation fan is arranged at the air outlet of the charging module and the air outlet of the direct-current charger, and the problem that the noise is uncontrollable exists during the work of the heat radiation fan. According to the standard requirements of GB 33001-2018, the use noise of chargers in different installation places is regulated to meet the requirements of I, II and III-level noise levels regulated by law. Once the charger has a noise exceeding condition, the risk of noise disturbing complaints of residents and residents can be met, and the operation management of operators is not facilitated.

Meanwhile, because the air-cooled direct current charger belongs to an open system, air flows along with the cooling of the fan, and flows into the air inlet and flows out of the air outlet from the air inlet so as to take away heat on the surface of the charging module and achieve the purpose of heat dissipation. In rainy and humid days, the corrosion of electronic components of the charging module and internal short circuit faults can be caused due to excessive moisture in the air; the salinity of the use place close to the seaside is high, which can cause the salt fog corrosion of the charging module; for charging stations with large dust in some surrounding environments, the dust can be attached to the dustproof filter screen, so that the filter screen is blocked, and the heat dissipation performance is reduced.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a direct current charger, which can quickly and stably implement cooling of the direct current charger, and ensure long-term stable operation of the direct current charger.

The embodiment of the invention provides a direct-current charger, which comprises a charging system and a heat dissipation system, wherein the charging system is connected with the heat dissipation system through a liquid outlet pipe and a liquid inlet pipe;

the charging system comprises a closed module bin, and at least one power module and cooling liquid which are arranged in the closed module bin;

the heat dissipation system comprises a control module, a signal acquisition module and a heat dissipation execution module;

the signal acquisition module at least comprises a liquid outlet pipe temperature acquisition unit, and the liquid outlet pipe temperature acquisition unit is used for acquiring first temperature information of cooling liquid in the liquid outlet pipe; the heat dissipation execution module at least comprises a first circulating heat dissipation unit and a second circulating heat dissipation unit;

the control module is respectively connected with the liquid outlet pipe temperature acquisition unit, the first circulating heat dissipation unit and the second circulating heat dissipation unit, and is used for receiving the first temperature information and controlling the first circulating heat dissipation unit or the second circulating heat dissipation unit to work according to the first temperature information.

Optionally, the heat dissipation execution module includes a hydraulic pump, a liquid storage tank, an electromagnetic directional valve, and a heat sink;

the first circulating heat dissipation unit comprises the hydraulic pump, the liquid storage tank and the electromagnetic reversing valve; the second circulating heat dissipation unit comprises the hydraulic pump, the liquid storage tank, the electromagnetic reversing valve and the heat dissipation fins;

the control module is used for controlling the first circulating heat dissipation unit to work when the first temperature information is smaller than a first temperature threshold value; the control module is further used for controlling the second circulating heat dissipation unit to work when the first temperature information is larger than or equal to the first temperature threshold value.

Optionally, the signal acquisition module further includes a liquid inlet pipe temperature acquisition unit, and the liquid inlet pipe temperature acquisition unit is configured to acquire second temperature information of the cooling liquid in the liquid inlet pipe;

the heat dissipation execution module also comprises a heat dissipation fan;

the control module is further configured to control the second circulation heat dissipation unit and the heat dissipation fan to operate simultaneously when the first temperature information is greater than or equal to the first temperature threshold and a temperature difference between the first temperature information and the second temperature information is greater than a second temperature threshold.

Optionally, the heat dissipation execution module further includes a check valve, and the check valve is respectively connected to the reservoir and the heat sink and is configured to prevent the cooling liquid from flowing into the heat sink in a reverse direction.

Optionally, the heat dissipation execution module includes a liquid storage tank and a hydraulic pump;

the signal acquisition module further comprises a first cooling liquid level detector and a second cooling liquid level detector; the first cooling liquid level detector is arranged at the upper end part of the closed module bin and used for detecting first liquid level information of the closed module bin; the second cooling liquid level detector is arranged in the liquid storage tank and used for detecting second liquid level information of the liquid storage tank;

the control module is further connected with the first cooling liquid level detector and the second cooling liquid level detector respectively, and is used for receiving the first liquid level information and the second liquid level information and controlling the hydraulic pump to stop working when the first liquid level information and/or the second liquid level information are smaller than a liquid level threshold value.

Optionally, the direct current charger further includes a fault warning module and a fault information storage module;

the fault alarm module is connected with the control module and used for receiving alarm information sent by the control module when the first liquid level information and/or the second liquid level information is smaller than a liquid level threshold value and giving an alarm according to the alarm information;

and the fault information storage module is connected with the control module and is used for receiving and storing the fault information sent by the control module when the first liquid level information and/or the second liquid level information is smaller than a liquid level threshold value.

Optionally, the heat dissipation execution module comprises a hydraulic pump;

the signal acquisition module further comprises a cooling liquid flow sensor, and the cooling liquid flow sensor is arranged between the hydraulic pump and the liquid inlet pipe and is used for detecting liquid inlet flow information flowing through the cooling liquid flow sensor;

the control module is also connected with the cooling liquid flow sensor and used for controlling the hydraulic pump to stop working when the liquid inlet flow information is smaller than a preset flow threshold value.

the fault alarm module is connected with the control module and used for receiving alarm information sent by the control module when the liquid inlet flow information is smaller than a preset flow threshold value and giving an alarm according to the alarm information;

and the fault information storage module is connected with the control module and used for receiving and storing the fault information sent by the control module when the liquid inlet flow information is smaller than a preset flow threshold value.

Optionally, the fault warning module includes a voice warning unit and/or a display warning unit;

and when the fault warning module comprises a display warning unit, the fault warning module and the fault information storage module are integrated in the touch display device.

Optionally, the liquid inlet pipe is connected with the upper end of the closed module bin, and the liquid outlet pipe is connected with the lower end of the closed module bin.

According to the direct-current charger provided by the embodiment of the invention, the first temperature information of the cooling liquid of the liquid outlet pipe is acquired by the liquid outlet pipe temperature acquisition unit, meanwhile, the control module is respectively connected with the liquid outlet pipe temperature acquisition unit, the first circulating heat dissipation unit and the second circulating heat dissipation unit, the first circulating heat dissipation unit or the second circulating heat dissipation unit is controlled to work according to the first temperature information acquired by the liquid outlet pipe temperature acquisition unit, and the first circulating heat dissipation unit and the second circulating heat dissipation unit can cool the cooling liquid with different temperatures, so that the direct-current charger can be rapidly and stably cooled, and the intelligence of the heat dissipation working process of the direct-current charger is ensured; the heat dissipation requirement of the charging system is met, and meanwhile, the power consumption of the heat dissipation system can be reduced, so that the purposes of energy conservation and emission reduction are achieved; furthermore, the power module is cooled in a closed liquid cooling mode, and the functions of noise reduction, dust prevention, rust prevention and salt mist corrosion prevention are taken into consideration, so that the long-term stable operation of the direct current charger is guaranteed.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of a dc charger according to an embodiment of the present invention;

fig. 2 is a schematic view of a modular structure of a dc charger according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another dc charger according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.

Fig. 1 is a schematic structural diagram of a direct current charger according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a dc charger according to an embodiment of the present invention in a modular manner, as shown in fig. 1 and fig. 2, the direct current charger according to the embodiment of the present invention includes a charging system 10 and a heat dissipation system 20, and the charging system 10 and the heat dissipation system 20 are connected by a liquid outlet pipe 31 and a liquid inlet pipe 32; the charging system 10 comprises a closed module bin 11, and at least one power module 12 and a cooling liquid 13 which are arranged in the closed module bin 11; the heat dissipation system 20 comprises a control module 21, a signal acquisition module 22 and a heat dissipation execution module 23; the signal acquisition module 22 at least comprises a liquid outlet pipe temperature acquisition unit 221, and the liquid outlet pipe temperature acquisition unit 221 is used for acquiring first temperature information of liquid outlet pipe cooling liquid; the heat dissipation executing module 23 at least includes a first circulation heat dissipation unit 231 and a second circulation heat dissipation unit 232; the control module 21 is connected to the drain pipe temperature acquisition unit 221, the first circulating heat dissipation unit 231, and the second circulating heat dissipation unit 232, respectively, and is configured to receive the first temperature information and control the first circulating heat dissipation unit 231 or the second circulating heat dissipation unit 232 to operate according to the first temperature information.

Illustratively, as shown in fig. 1 and fig. 2, a drain pipe temperature collecting unit 221 is disposed at the position of the drain pipe 31, and the drain pipe temperature collecting unit 221 is configured to collect first temperature information of the cooling liquid in the drain pipe 31. The control module 21 is connected to the drain pipe temperature acquisition unit 221, the first circulating heat dissipation unit 231, and the second circulating heat dissipation unit 232, respectively, and the control module 21 is configured to receive first temperature information acquired by the drain pipe temperature acquisition unit 221, and control the first circulating heat dissipation unit 231 or the second circulating heat dissipation unit 232 to operate according to the first temperature information. Because the first circulating heat dissipation unit 231 or the second circulating heat dissipation unit 232 can dissipate heat of cooling liquid with different temperatures, the first circulating heat dissipation unit 231 or the second circulating heat dissipation unit 232 is controlled to work according to the first temperature information, so that cooling of the direct current charger can be rapidly and stably achieved, and the heat dissipation working process intelligence of the direct current charger is guaranteed. In addition, the control module 21 controls the first circulating heat dissipation unit 231 or the second circulating heat dissipation unit 232 to work according to the first temperature information, so that the power consumption of the heat dissipation system can be reduced while the heat dissipation requirement of the charging system is met, and the purposes of energy conservation and emission reduction are achieved.

Further, in the charging system 10 provided in the embodiment of the present invention, the closed module bin 11 is provided, and the at least one power module 12 and the cooling liquid 13 are disposed in the closed module bin 11, so that the power module 12 can be cooled in a closed liquid cooling manner, and the functions of noise reduction, dust prevention, rust prevention and salt mist corrosion prevention can be taken into consideration, so as to ensure long-term stable operation of the dc charger.

It can be understood that a plurality of groups of power modules 12 may be disposed in the closed module bin 11, fig. 1 only illustrates three groups, the number of the power modules 12 disposed in the closed module bin 11 is not limited in the embodiment of the present invention, and the number of the power modules 12 may be set reasonably according to actual charging requirements.

Optionally, the control module 21 may be an industrial-grade ARM microcontroller, which supports multiple interface types such as CAN, Ethernet, I2C, UART, USB, and the like, has 165I/O ports that CAN connect to multiple peripheral units, has good environmental adaptability, CAN normally operate at-40 ℃ to +85 ℃, ensures good universality of the control module 21, and CAN normally operate under different working conditions.

Optionally, drain pipe temperature acquisition unit 221 can be temperature sensor, specifically can select for use the probe formula temperature sensor who takes stainless steel screw thread, through screw thread fixed mounting on drain pipe 31, drain pipe 31 can be the copper pipe, and it has the screw hole to open on it and is used for fixed temperature sensor. Specifically, the drain pipe temperature acquisition unit 221 may select a temperature sensor such as a PT1000 resistor, an infrared temperature measurement sensor, an NTC thermistor, and the like, and the specific type of the temperature sensor is not limited in the embodiment of the present invention, and the PT1000 resistor may be preferably selected according to an actual situation.

To sum up, according to the direct current charger provided by the embodiment of the invention, the first temperature information of the coolant of the liquid outlet pipe is acquired by the liquid outlet pipe temperature acquisition unit, and meanwhile, the control module is respectively connected with the liquid outlet pipe temperature acquisition unit, the first circulating heat dissipation unit and the second circulating heat dissipation unit; the heat dissipation requirement of the charging system is met, and meanwhile, the power consumption of the heat dissipation system can be reduced, so that the purposes of energy conservation and emission reduction are achieved; furthermore, the power module is cooled in a closed liquid cooling mode, and the functions of noise reduction, dust prevention, rust prevention and salt mist corrosion prevention are taken into consideration, so that the long-term stable operation of the direct current charger is guaranteed.

The following describes in detail a heat dissipation working process of the dc charger according to the embodiment of the present invention.

Optionally, as shown in fig. 1 and fig. 2, the heat dissipation performing module 23 provided in the embodiment of the present invention may include a hydraulic pump 233, a liquid storage tank 234, an electromagnetic directional valve 235, and a heat sink 236; the first circulation heat radiating unit 231 may include a hydraulic pump 233, a reservoir 234, and a solenoid directional valve 235; the second circulation heat radiation unit comprises a hydraulic pump 233, a liquid storage tank 234, an electromagnetic directional valve 235 and a heat radiation fin 236; the control module 21 is configured to control the first circulation heat dissipation unit 231 to work when the first temperature information is smaller than the first temperature threshold; the control module 21 is further configured to control the second circulation heat dissipation unit 232 to work when the first temperature information is greater than the first temperature threshold.

Specifically, the liquid outlet temperature collecting unit 221 collects first temperature information of cooling liquid in the liquid outlet pipe 31 in real time and sends the first temperature information to the control module 21, and the control module 21 compares the received first temperature information with a preset first temperature threshold value and generates a corresponding instruction to send to the heat dissipation execution module. The preset first temperature threshold may be understood as a switching temperature of the first circulating heat dissipation unit 231 and the second circulating heat dissipation unit 232, when the first temperature information is less than the first temperature threshold, the control module 21 controls the first circulating heat dissipation unit 231 to operate, and when the first temperature information is greater than or equal to the first temperature threshold, the control module 21 controls the second circulating heat dissipation unit 232 to operate. Specifically, when the first temperature information is smaller than the first temperature threshold, the control module 21 controls the electromagnetic directional valve 235 to be inactive, and the cooling liquid directly flows back to the liquid storage tank 234; when the first temperature information is greater than or equal to the first temperature threshold, the control module 21 controls the electromagnetic directional valve 235 to act, and the cooling liquid flows back to the liquid storage tank 234 after being radiated by the cooling fin 236. The hydraulic pump 233 is used to pump the coolant into the liquid inlet pipe 32.

Further, by combining the performance of the cooling fluid with a number of theoretical test experiments, a first temperature threshold of 30 ℃ may be achieved. It should be noted that, the embodiment of the present invention is only described by way of example as an optional value of the first temperature threshold, and when the temperature of the cooling liquid is low (for example, less than 30 ℃), the cooling liquid can be continuously recycled only after being circulated through the internal heat dissipation; when the temperature of the cooling liquid is high (for example, greater than or equal to 30 ℃), the cooling liquid needs to be recycled after being subjected to heat dissipation by the radiating fins. It is understood that the value of the first temperature threshold may be variable for different cooling fluids and different working scenarios, which is not limited by the embodiment of the present invention.

In conclusion, the control module controls the electromagnetic directional valve to act or not to act according to first temperature information of the cooling liquid of the liquid outlet pipe acquired by the liquid outlet pipe temperature acquisition unit so as to control the cooling liquid to enter the first circulating heat dissipation unit or the second circulating heat dissipation unit, and different circulating heat dissipation units are simple to switch, so that the cooling of the direct-current charger can be rapidly and stably realized, and the heat dissipation working process of the direct-current charger is intelligent; the heat dissipation requirement of the charging system is met, and meanwhile, the power consumption of the heat dissipation system can be reduced, and the purposes of energy conservation and emission reduction are achieved.

Optionally, as shown in fig. 1 and fig. 2, on the basis of the foregoing embodiment, the signal acquisition module 22 may further include a liquid inlet pipe temperature acquisition unit 222, where the liquid inlet pipe temperature acquisition unit 222 is configured to acquire second temperature information of the cooling liquid in the liquid inlet pipe 32; the heat dissipation performing module 23 may further include a heat dissipation fan 237; the control module 21 may be further configured to control the second circulation heat dissipation unit 232 and the heat dissipation fan 237 to work simultaneously when the first temperature information is greater than or equal to the first temperature threshold and the temperature difference between the first temperature information and the second temperature information is greater than the second temperature threshold.

Specifically, the signal acquisition module 22 in the embodiment of the present invention may further include a liquid inlet pipe temperature acquisition unit 222, and the heat dissipation execution module 23 may further include a heat dissipation fan 237, where when the temperature of the cooling liquid after heat dissipation by the heat dissipation fins 236 is still higher, which is acquired by the liquid inlet pipe temperature acquisition unit 222, for example, when a temperature difference between the second temperature information of the cooling liquid in the liquid inlet pipe 32 acquired by the liquid inlet pipe temperature acquisition unit 222 and the first temperature information of the cooling liquid in the liquid outlet pipe 31 acquired by the liquid outlet pipe temperature detection unit 221 is greater than a second temperature threshold, it is described that the cooling liquid needs to be further cooled. Therefore, the control module 21 is further configured to control the second circulating heat dissipation unit 232 and the heat dissipation fan 237 to work simultaneously when the first temperature information is greater than or equal to the first temperature threshold and the temperature difference between the first temperature information and the second temperature information is greater than the second temperature threshold, and to dissipate heat of the cooling liquid simultaneously through the second heat dissipation unit 232 and the heat dissipation fan, so as to increase the heat dissipation strength of the cooling liquid, reduce the temperature of the cooling liquid, and ensure that the power module 12 can be cooled by the cooling liquid.

Further, by combining the performance of the cooling fluid with a number of theoretical test experiments, the second temperature threshold may be 10 ℃. It should be noted that, the embodiment of the present invention is only described in an exemplary manner to illustrate the selectable value of the second temperature threshold, and it should be understood that the value of the second temperature threshold is variable for different cooling liquids and different working scenarios, and the embodiment of the present invention is not limited to this.

Optionally, the liquid inlet pipe temperature acquisition unit 222 may be a temperature sensor, and may specifically select a probe type temperature sensor with stainless steel threads, and is fixedly mounted on the liquid inlet pipe 32 through threads, and the liquid inlet pipe 32 may be a copper pipe, and is provided with a threaded hole for fixing the temperature sensor. Specifically, the temperature acquisition unit 222 of the liquid inlet pipe may select a temperature sensor such as a PT1000 resistor, an infrared temperature sensor, an NTC thermistor, and the like, and the embodiment of the present invention does not limit the specific type of the temperature sensor, and the PT1000 resistor may be preferably selected according to the actual situation.

In summary, through the fact that the difference between the second temperature information of the liquid inlet pipe cooling liquid and the first temperature information of the liquid outlet pipe cooling liquid is large, for example, when the difference is larger than the second temperature threshold value, the heat dissipation fan is further additionally arranged, heat is dissipated through the heat dissipation fins and the heat dissipation fan at the same time, the heat dissipation strength of the cooling liquid is increased, the temperature of the cooling liquid is reduced, it is guaranteed that the power supply module can be cooled through the cooling liquid, and it is guaranteed that the direct current charger can be normally charged externally.

Optionally, as shown in fig. 1, the heat dissipation performing module 23 according to the embodiment of the present invention may further include a check valve 238, where the check valve 238 is connected to the liquid storage tank 234 and the heat sink 236, respectively, to prevent the cooling liquid from reversely flowing into the heat sink 236, so as to ensure that the heat dissipation performing module 23 can perform a heat dissipation operation, and ensure that the dc charger works normally as a whole.

Alternatively, as shown in fig. 1 and fig. 2, on the basis of the above embodiment, the heat dissipation execution module 23 may include a liquid storage tank 234 and a hydraulic pump 233; the signal acquisition module 22 may further include a first coolant level detector 223 and a second coolant level detector 224; the first cooling liquid level detector 223 is arranged at the upper end part of the closed module bin 11 and is used for detecting first liquid level information of the closed module bin 11; the second cooling liquid level detector 224 is disposed in the liquid storage tank 234 and is used for detecting second liquid level information of the liquid storage tank 234; the control module 21 is further connected to the first cooling liquid level detector 223 and the second cooling liquid level detector 224, respectively, and configured to receive the first liquid level information and the second liquid level information, and control the hydraulic pump 233 to stop working when the first liquid level information and/or the second liquid level information is smaller than a liquid level threshold.

Specifically, first coolant liquid level detector 223 can fixed mounting in the upper end of closed module storehouse 11, and the bottom probe of first coolant liquid level detector 223 contacts with the coolant liquid in the closed module storehouse 11, monitors the coolant liquid level in the closed module storehouse 11 in real time to first liquid level information that will gather sends to control module 21. A second coolant level detector 224; the second cooling liquid level detector 223 may be fixedly installed in the liquid storage tank 234, and a bottom probe of the second cooling liquid level detector 223 contacts the cooling liquid in the liquid storage tank 234, monitors the cooling liquid level in the liquid storage tank 234 in real time, and sends the collected second liquid level information to the control module 21. The control module 21 compares the first liquid level information and/or the second liquid level information with a preset liquid level threshold, generates a corresponding instruction and sends the instruction to the heat dissipation execution module. If the first liquid level information and/or the second liquid level information is smaller than the liquid level threshold, the liquid level of the cooling liquid of the closed module bin 11 and/or the liquid storage tank 234 inevitably decreases, and since the bottom probes of the first cooling liquid level detector 223 and the second cooling liquid level detector 224 are installed in contact with the cooling liquid, when the liquid level of the cooling liquid drops to be lower than the bottom probes of the detectors, the relay inside the detectors is disconnected, so that a falling edge signal is generated, and once the falling edge signal is collected by the control module, the hydraulic pump 233 is controlled to stop working.

It will be appreciated that since the total amount of coolant in the dc charger of the embodiment of the present invention is fixed, the coolant levels of both the enclosed module compartment 11 and the reservoir 234 will necessarily decrease when the total amount of coolant decreases due to a leakage problem. However, since the bottom areas of the closed module bin 11 and the liquid storage tank 234 may be different, the liquid level dropping speed may be different, for example, when the bottom area of the closed module bin 11 is larger and the bottom area of the liquid storage tank 234 is smaller, the liquid level dropping speed of the liquid storage tank 234 is fast, the liquid level dropping speed of the closed module bin 11 is slow, and at this time, it may be determined whether liquid leakage occurs only by the second liquid level information, so as to ensure high liquid leakage detection efficiency; otherwise, the leakage can be judged only through the second liquid level information. Or, when the bottom areas of the closed module bin 11 and the liquid storage tank 234 are equivalent in size, whether liquid leakage occurs or not can be judged simultaneously according to the first liquid level information and the second liquid level information, and high accuracy of liquid leakage judgment is guaranteed. The embodiment of the invention does not limit which liquid level information is compared with the liquid level threshold, and as the total amount of the cooling liquid is kept unchanged, the accurate detection of liquid leakage can be ensured only by judging whether the drain electrode occurs according to at least one of the first liquid level information and the second liquid level information.

Optionally, the first cooling liquid level detector 223 and the second cooling liquid level detector 224 may be both wired water immersion detectors, and are convenient to compare and judge with a liquid level threshold. Further, the embodiment of the present invention does not limit the types of the first coolant level detector 223 and the second coolant level detector 224.

Further, as shown in fig. 2, the dc charger according to the embodiment of the present invention may further include a fault warning module 40 and a fault information storage module 50; the fault warning module 40 is connected with the control module 21 and is used for receiving warning information sent by the control module 21 when the first liquid level information and/or the second liquid level information is smaller than a liquid level threshold value and giving an alarm according to the warning information; the fault information storage module 50 is connected to the control module 21, and is configured to receive and store fault information sent by the control module 21 when the first liquid level information and/or the second liquid level information is smaller than the liquid level threshold.

Illustratively, when the control module 21 determines that liquid leaks, that is, the first liquid level information and/or the second liquid level information is smaller than the liquid level threshold, the control module 21 generates a corresponding instruction signal and outputs the instruction signal to the fault warning module 40, so as to control the fault warning module 40 to give an alarm and give an alarm to a worker or a user of the dc charger. Meanwhile, the control module 21 generates a corresponding instruction signal and outputs the instruction signal to the fault information storage module 50, and the fault information storage module 50 is controlled to store fault information, so that the subsequent understanding of the fault information by a worker is facilitated, the overhaul is convenient, the subsequent improvement is facilitated, and the product performance is improved.

Optionally, as shown in fig. 1 and fig. 2, on the basis of the above embodiment, the heat dissipation performing module 23 may further include a hydraulic pump 233; the signal acquisition module 22 may further include a coolant flow sensor 225, wherein the coolant flow sensor 225 is disposed between the hydraulic pump 233 and the liquid inlet pipe 32, and is configured to detect liquid inlet flow information flowing through the coolant flow sensor 225; the control module 21 is further connected to a coolant flow sensor 225, and is configured to control the hydraulic pump 233 to stop working when the intake flow information is smaller than a preset flow threshold.

Specifically, coolant flow sensor 225 may be a flow sensor with threads, and is fixedly installed behind hydraulic pump 233 on the side of liquid inlet pipe 32 through threads, so as to monitor the liquid inlet flow in real time, and send the collected liquid inlet flow information to control module 21. The control module 21 compares the liquid inlet flow rate information with a preset flow rate threshold value, and generates a corresponding instruction signal to output to the heat dissipation execution module 23. Through multiple experiments and reference to theoretical data, the oil well pump with the rated flow of 2.5L/min is selected, and the normal heat dissipation requirement of the heat dissipation system can be completely met. If the liquid inlet flow information is detected to be less than 2.5/min (considering the fluid characteristics of the cooling liquid, the flow is also dynamically changed, and 2.5 +/-0.5L/min is regarded as 2.5L/min), the hydraulic pump fault is judged to occur, and the control module 21 controls the hydraulic pump 233 to stop, so that the damage of the modeling hydraulic pump is avoided.

Optionally, the coolant flow sensor 225 may select a flow sensor such as a liquid turbine flow sensor, an intelligent electromagnetic flow sensor, a target-type flow sensor, and the like, and the embodiment of the present invention does not limit the specific type of the coolant flow sensor 225, and considers the actual demand, the coolant flow sensor 225 may select an intelligent electromagnetic flow sensor, and thus, it is ensured that the flow detection accuracy is high.

Further, as shown in fig. 2, the dc charger according to the embodiment of the present invention may further include a fault warning module 40 and a fault information storage module 50; the fault warning module 40 is connected with the control module 21 and is used for receiving warning information sent by the control module 21 when the liquid inlet flow information is smaller than a preset flow threshold value and giving an alarm according to the warning information; the fault information storage module 50 is connected to the control module 21, and is configured to receive and store fault information sent by the control module 21 when the intake liquid flow rate information is smaller than a preset flow rate threshold.

Illustratively, when the control module 21 determines that the hydraulic pump is faulty, that is, the inlet liquid flow rate information is smaller than the preset flow rate threshold, the control module 21 generates a corresponding instruction signal and outputs the instruction signal to the fault alarm module 40, so as to control the fault alarm module 40 to alarm and give an alarm prompt to a worker or a user of the dc charger. Meanwhile, the control module 21 generates a corresponding instruction signal and outputs the instruction signal to the fault information storage module 50, and the fault information storage module 50 is controlled to store fault information, so that the subsequent understanding of the fault information by a worker is facilitated, the overhaul is convenient, the subsequent improvement is facilitated, and the product performance is improved.

Further, with continued reference to fig. 2, the fault warning module 40 may include a voice warning unit 41 and/or a display warning unit 42, and fig. 2 only illustrates that the fault warning module 40 includes both the voice warning unit 41 and the display warning unit 42. The voice alarm unit 41 may perform a voice alarm according to the alarm signal sent by the control module 21, and the display alarm unit 42 may perform a display alarm according to the alarm signal sent by the control module 21.

Further, when the fault alarm module 40 includes the display alarm unit 42, the fault alarm module 40 and the fault information storage module 50 may be integrally disposed in the touch display device, and the display alarm is performed through the touch display device, and meanwhile, the fault information storage and the memory of the touch display device are stored in the memory, so that on the premise that the fault alarm and the fault information storage are realized, the dc charger is simple in structure and high in integration level.

Further, the touch display device can also display other work information of the direct current charger, for example, the temperature of the cooling liquid in the liquid pipe 31 and the temperature of the cooling liquid in the liquid inlet pipe 32 are displayed, so that the direct current charger is ensured to have various functions, and the user experience is improved.

Further, the failure information storage module 50 is mainly used for storing failure information, and the failure information storage module 50 may be integrated in a memory of the touch display device. The touch display device may communicate with the control module 21 through the RS 232. The storage capacity of the fault information can be 1000, and the full storage can be deleted manually or automatically according to the storage time. Technicians can query the fault history through the touch display device, read fault information, study fault content, analyze fault generation types and facilitate later maintenance.

In the actual application process, each fault type of the heat dissipation system 30 can be represented by a corresponding fault code, table 1 is a storage form description of fault information, and the fault type can be located by querying the fault code.

In table 1, failure category: 02 represents an electrical fault; data (HEX) 0200000000400000, 02 represents an electrical fault, 00000000400000 represents fault code data in octal, the mode that the low byte is transmitted first is translated into binary 010000000000000000000000000000000000, and 35 th bit is 1, which represents a leakage fault; 0200000000800000, 02 represents an electrical fault, 00000000800000 represents fault code data, octal represents, the way the low byte is sent first, translation is to 100000000000000000000000000000000000 binary, 36 th bit is 1 represents a hydraulic pump fault.

Table 1 description of the storage form of failure information

Fault code	Name of failure	Class of failure	Data (HEX)
				D34	Leakage fault	02	0200000000400000
D35	Failure of hydraulic pump	02	0200000000800000

Optionally, fig. 3 is a schematic structural diagram of another dc charger according to an embodiment of the present invention, and referring to fig. 1 and fig. 3, a liquid inlet pipe 32 is connected to an upper end portion of the closed module bin 11, and a liquid outlet pipe 31 is connected to a lower end portion of the closed module bin 11, so that a cooling liquid after heat dissipation is injected into the closed module bin 11 from the upper end portion of the closed module bin 11, and after heat exchange with the power module 12 occurs, the cooling liquid absorbs heat generated by the power module 12 and flows out from the liquid outlet pipe 31 located at the lower end portion of the closed module bin 11, and is dissipated by a heat dissipation system. The upper end part of the liquid inlet pipe 32 connected with the closed module bin 11 is arranged, the lower end part of the liquid outlet pipe 31 connected with the closed module bin 11 guarantees that cooling liquid can be in full contact with the power module 12, more heat generated by the power module 12 is absorbed, and the cooling effect of the power module 12 is good.

Optionally, the liquid inlet pipe 32 and the liquid outlet pipe 31 may be disposed on the same side of the closed module bin 11, as shown in fig. 1, and the liquid inlet pipe 32 and the liquid outlet pipe 31 may also be disposed on different sides of the closed module bin 11, as shown in fig. 3, that is, the liquid inlet pipe 32 and the liquid outlet pipe 31 are disposed diagonally, so as to further ensure that the cooling liquid fully contacts the power module 12, absorb more heat generated by the power module 12, and ensure that the cooling effect of the power module 12 is good.

In summary, the embodiment of the invention designs a novel closed type liquid cooling direct current charger with a temperature self-adaptive adjustment function, innovatively uses a first circulating heat dissipation system and a second circulating heat dissipation system, ensures the dynamic flexibility of the heat dissipation system, reduces the power consumption of the heat dissipation system, and achieves the purposes of energy conservation and emission reduction; meanwhile, the signal acquisition module is also provided with a first liquid level detector and a second liquid level detector, so that the liquid level information of the closed module bin and the liquid storage tank is acquired in real time, and the leakage fault of the heat dissipation system is detected; the signal acquisition module is also provided with a cooling liquid flow sensor for sampling the cooling liquid inlet flow information in real time and detecting the fault of the hydraulic pump; the fault warning module has good man-machine interaction performance and can send out warning through the voice warning unit and/or the display warning unit; the fault information storage module can store fault information, and the good readability of the fault information storage module facilitates troubleshooting and accurate positioning of faults in the later period.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may be capable of cooperating with each other in various ways and of being technically driven. Numerous variations, rearrangements, combinations, and substitutions will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A direct current charger is characterized by comprising a charging system and a heat dissipation system, wherein the charging system and the heat dissipation system are connected through a liquid outlet pipe and a liquid inlet pipe;

2. The direct current charger according to claim 1, wherein the heat dissipation execution module comprises a hydraulic pump, a liquid storage tank, an electromagnetic directional valve and a heat sink;

3. The direct current charger according to claim 2, wherein the signal acquisition module further comprises a liquid inlet pipe temperature acquisition unit, the liquid inlet pipe temperature acquisition unit being configured to acquire second temperature information of the cooling liquid in the liquid inlet pipe;

the heat dissipation execution module also comprises a heat dissipation fan;

4. The direct current charger according to claim 2, wherein the heat dissipation execution module further comprises a check valve, and the check valve is connected to the liquid storage tank and the heat sink respectively, and is configured to prevent the cooling liquid from flowing backward into the heat sink.

5. The direct current charger according to claim 1, wherein the heat dissipation execution module includes a liquid storage tank and a hydraulic pump;

6. The direct current charger according to claim 5, characterized in that the direct current charger further comprises a fault warning module and a fault information storage module;

7. The direct current charger according to claim 1, wherein the heat dissipation execution module includes a hydraulic pump;

8. The direct current charger according to claim 7, characterized in that the direct current charger further comprises a fault warning module and a fault information storage module;

9. The direct current charger according to claim 6 or 8, characterized in that the fault warning module comprises a voice warning unit and/or a display warning unit;

10. The direct-current charger according to claim 1, characterized in that the liquid inlet pipe is connected with the upper end of the closed module bin, and the liquid outlet pipe is connected with the lower end of the closed module bin.