Cooling system capable of realizing automatic liquid injection function and automatic liquid injection method

Abstract

The present invention discloses a cooling system and an automatic liquid injection method capable of realizing an automatic liquid injection function. The cooling system comprises a heat exchanger, a converter, a liquid cooling pipeline connecting the heat exchanger and the converter, a coolant tank, a liquid injection pump and a control unit. The liquid level sensor of the coolant tank detects its liquid level in real time. When the liquid injection pump is turned on, the coolant from the coolant tank is injected into the liquid cooling pipeline. The control unit controls the start and stop operation of the liquid injection pump, the start and stop operation of the circulation pump, and the set dynamic hydraulic threshold and static hydraulic threshold. When the liquid level of the coolant tank reaches the upper limit value, the coolant is injected into the liquid cooling pipeline via the liquid injection pump; when the coolant pressure in the liquid cooling pipeline reaches the upper limit value of the static hydraulic threshold, the liquid injection pump is turned off, and the circulation pump performs the start and stop operation with a preset cycle. When the circulation pump is started, the coolant is driven to circulate in the liquid cooling pipeline. Compared with the prior art, the present invention optimizes the cooling system, simplifies the liquid injection process, and realizes automatic liquid injection.

Description

Technical Field

[0001] The invention relates to the field of converter cooling systems, in particular to a cooling system and an automatic liquid injection method capable of realizing an automatic liquid injection function. Background Art

[0002] like Figure 1 As shown, the existing energy storage converter is often equipped with a cooling system using coolant as a heat transfer medium. Before operation, an appropriate amount of coolant needs to be injected into the pipeline of the cooling system. During the injection, the external injection pump 5 is connected to the cooling system through a corresponding hose and valve 7. At the same time, before using the injection pump 5, the pump body needs to be filled with liquid in advance, which is a complicated process. Improper pumping operation may also cause coolant leakage.

[0003] Due to the tortuous distribution of the pipelines in the inverter cooling system, it is difficult to exhaust the air in the pipeline at one time during the injection process. Too much residual air in the pipeline will cause the heat dissipation efficiency of the cooling system to decrease. Therefore, it is necessary to repeatedly start and stop the circulating pump of the cooling system during injection, so that the air in the pipeline will gather at the high point of the pipeline when the circulating pump stops, and be discharged through the exhaust valve set here, thereby ensuring the heat dissipation efficiency of the cooling system and maintaining the normal operation of the inverter heating power elements. Usually, the above-mentioned exhaust process takes a long time, and after the air is discharged, the coolant pressure drops, and the cooling system needs to be replenished. The operation process is cumbersome, and improper replenishment operation will cause the coolant to flow back from the cooling system pipeline and spray out, affecting the operation of other electrical equipment on site.

[0004] In addition, during the normal operation of the cooling system, there is still a loss of coolant, and maintenance personnel need to be on site to replenish the coolant in time, otherwise it will cause the coolant pressure in the pipeline to drop, the heat dissipation efficiency to decrease, and cause the equipment to alarm or reduce power operation. At the same time, in order to ensure safety, the equipment needs to be shut down during the refilling process, which affects the utilization rate of the equipment and increases maintenance costs.

[0005] In summary, how to achieve automatic liquid injection of the energy storage converter cooling system to simplify the liquid injection process, reduce maintenance costs, and thereby improve the heat dissipation efficiency and equipment utilization of the cooling system is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a cooling system that can realize the automatic liquid injection function, which realizes the automatic liquid injection of the energy storage inverter cooling system through the mutual cooperation of a liquid level sensor, an injection pump, a circulation pump and a control unit, thereby simplifying the liquid injection process, reducing maintenance costs, and further improving the heat dissipation efficiency and equipment utilization of the cooling system.

[0007] In order to achieve the above object, the present invention provides a cooling system capable of realizing automatic liquid injection function, the cooling system comprising a heat exchanger, an inverter and a liquid cooling pipeline connecting the heat exchanger and the inverter, and a circulating pump is also provided on the liquid cooling pipeline. The cooling system also includes: a coolant tank for storing coolant, wherein the coolant tank also includes a liquid level sensor for detecting the liquid level of the coolant tank in real time; an injection pump connected to the coolant tank, and when the injection pump is turned on, it is used to inject the coolant from the coolant tank into the liquid cooling pipeline; and a control unit, which is used to control the start and stop operations of the injection pump, the start and stop operations of the circulation pump, and set a dynamic hydraulic threshold and a static hydraulic threshold corresponding to the state of the coolant in the liquid cooling pipeline, wherein when the liquid level of the coolant tank reaches an upper limit value of the liquid level, the control unit is configured to start the injection pump, and the coolant is injected into the liquid cooling pipeline via the injection pump; when the coolant pressure in the liquid cooling pipeline reaches an upper limit value of the static hydraulic threshold, the control unit is configured to turn off the injection pump, and the circulation pump performs the start and stop operation with a preset cycle, wherein when the circulation pump is started, the coolant is driven to circulate in the liquid cooling pipeline.

[0008] Furthermore, the coolant tank is also provided with a breathing valve for connecting the inside and outside of the coolant tank, so that the coolant in the coolant tank automatically flows into the injection pump under the action of gravity to complete the filling of the pump.

[0009] Furthermore, the coolant tank is also provided with a liquid filling port for filling the coolant tank.

[0010] Furthermore, the cooling system also includes a first three-way valve and a second three-way valve, the first end and the second end of the first three-way valve are respectively connected to the coolant tank and the injection pump, and the third end of the first three-way valve is connected to an external coolant source; the first end and the second end of the second three-way valve are respectively connected to the injection pump and the liquid cooling pipeline, and the third end of the second three-way valve is connected to the coolant tank.

[0011] Furthermore, when the circulation pump is started, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

[0012] Furthermore, when the circulating pump is shut down, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the static hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump.

[0013] Furthermore, the cooling system also includes a temperature sensor, which is arranged on the liquid cooling pipeline, and the temperature sensor is used to monitor the coolant temperature at the liquid inlet end of the inverter and output a temperature detection signal to the control unit, wherein when the circulating pump is started, if the coolant temperature reaches the upper limit of the operating temperature and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

[0014] Further, when the liquid level in the coolant tank is lower than a lower limit value of the liquid level, the control unit is configured to turn off the injection pump and add liquid to the coolant tank.

[0015] Furthermore, the cooling system also includes a one-way valve connected between the injection pump and the liquid cooling pipeline, and the one-way valve is used to prevent the coolant in the liquid cooling pipeline from flowing back into the coolant tank.

[0016] Furthermore, an exhaust valve is also provided on the liquid cooling pipeline.

[0017] The present invention also provides an automatic liquid injection method for a cooling system, wherein the cooling system comprises a heat exchanger, a converter, and a liquid cooling pipeline connecting the heat exchanger and the converter, wherein a circulating pump is also provided on the liquid cooling pipeline. The automatic liquid injection method comprises the following steps:

[0018] Providing a coolant tank and performing a liquid filling operation on the coolant tank;

[0019] A liquid level sensor is provided, the liquid level sensor is arranged on the coolant tank, and is used to detect the liquid level of the coolant tank in real time;

[0020] Providing a liquid injection pump connected to the coolant tank, the liquid injection pump is used to inject the coolant from the coolant tank into the liquid cooling pipeline when it is turned on; and

[0021] A control unit is provided for controlling the start and stop operation of the injection pump, the start and stop operation of the circulation pump, and setting a dynamic hydraulic pressure threshold and a static hydraulic pressure threshold corresponding to the state of the coolant in the liquid cooling pipeline,

[0022] When the liquid level in the coolant tank reaches an upper limit value of the liquid level, the control unit is configured to start the injection pump, and the coolant is injected into the liquid cooling pipeline through the injection pump; when the coolant pressure in the liquid cooling pipeline reaches an upper limit value of the static hydraulic threshold, the control unit is configured to turn off the injection pump, and the circulation pump performs a start-stop operation with a preset cycle, wherein when the circulation pump is started, it drives the coolant to circulate in the liquid cooling pipeline.

[0023] Furthermore, the cooling system further comprises a first three-way valve and a second three-way valve, and the above-mentioned step of adding liquid to the coolant tank further comprises:

[0024] The control unit switches the first three-way valve and the second three-way valve to form a fluid loop including the coolant tank, the first three-way valve, the injection pump, the second three-way valve and the coolant tank in sequence;

[0025] Adding liquid through a filling port provided on the coolant tank; and

[0026] The coolant in the coolant tank automatically flows into the injection pump through the first three-way valve under the action of gravity until the coolant flows back to the coolant tank, completing the priming of the injection pump.

[0027] Furthermore, the cooling system further comprises a first three-way valve and a second three-way valve, and the above-mentioned step of adding liquid to the coolant tank further comprises:

[0028] The control unit switches the first three-way valve and the second three-way valve to form a fluid path sequentially including an external coolant source, the first three-way valve, the injection pump, the second three-way valve and the coolant tank; and

[0029] The control unit is configured to start the injection pump and automatically add liquid to the coolant tank until the liquid level in the coolant tank reaches the upper limit of the liquid level. The control unit is configured to turn off the injection pump and switch the first three-way valve and the second three-way valve to form a fluid path that sequentially includes the coolant tank, the first three-way valve, the injection pump, the second three-way valve and the liquid cooling pipeline.

[0030] Furthermore, the automatic liquid injection method further comprises:

[0031] When the liquid level in the coolant tank is lower than the lower limit value of the liquid level, the control unit is configured to turn off the filling pump and automatically add liquid to the coolant tank.

[0032] Furthermore, the automatic liquid injection method further comprises:

[0033] When the circulation pump is started, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

[0034] Furthermore, the automatic liquid injection method further comprises:

[0035] When the circulation pump is stopped, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the static hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump.

[0036] Furthermore, the cooling system further comprises a temperature sensor, which is arranged on the liquid cooling pipeline, and the temperature sensor is used to monitor the coolant temperature at the liquid inlet end of the converter and output a temperature detection signal to the control unit; and

[0037] The automatic injection method also includes:

[0038] When the circulation pump is started, if the coolant temperature reaches the upper limit of the operating temperature and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

[0039] Furthermore, the automatic liquid injection method further comprises:

[0040] When the circulation pump is started, the gas in the liquid cooling pipeline is collected together with the coolant circulation, and when the circulation pump is stopped, the collected gas is discharged through the exhaust valve arranged on the liquid cooling pipeline.

[0041] Compared with the prior art, the cooling system and automatic liquid injection method of the present invention capable of realizing the automatic liquid injection function have at least one of the following effects or advantages:

[0042] 1. The cooling system includes a coolant tank, a liquid injection pump and a control unit. The liquid injection pump is connected between the coolant tank and the liquid cooling pipeline. When the coolant is injected for the first time, the coolant is added from the liquid injection port provided on the coolant tank. The coolant in the coolant tank is automatically injected into the liquid injection pump under the action of gravity to realize automatic filling of the pump. When the coolant in the coolant tank increases to a certain level, the control unit turns on the liquid injection pump to realize automatic filling of the liquid cooling pipeline, thereby achieving the purpose of simplifying the liquid injection process.

[0043] 2. The control unit sets the corresponding dynamic hydraulic threshold and static hydraulic threshold according to the state of the coolant in the liquid cooling pipeline. When it is detected that the coolant pressure in the liquid cooling pipeline is outside the corresponding set range, no matter the cooling system is in operation or shutdown, the control unit can start the injection pump to automatically replenish the coolant in the liquid cooling pipeline, so as to shorten the maintenance time, reduce manual maintenance, and improve the heat dissipation efficiency and equipment utilization;

[0044] 3. In addition, the cooling system also includes a first three-way valve and a second three-way valve. When the amount of coolant in the coolant tank is reduced to a certain level, the control unit can switch the first three-way valve and the second three-way valve to connect the external coolant source, the injection pump and the coolant tank to automatically replenish the coolant in the coolant tank, further reducing manual maintenance and maintenance costs.

[0045] The above description will be described in detail below with reference to implementation examples, and a further explanation will be provided for the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0047] Figure 1 It is a structural schematic diagram of a converter cooling system in the prior art;

[0048] Figure 2 A schematic structural diagram of a cooling system capable of realizing an automatic liquid injection function according to a first preferred embodiment of the present invention is shown;

[0049] Figure 3 A schematic structural diagram of a cooling system capable of realizing an automatic liquid injection function according to a second preferred embodiment of the present invention is shown;

[0050] Figure 4 A flow chart of an automatic liquid injection method for a cooling system according to a preferred embodiment of the present invention;

[0051] Figure 5 The present invention is a flow chart of an automatic liquid replenishment method for a cooling system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and the following various embodiments, in which the same numbers represent the same or similar components. On the other hand, well-known components and steps are not described in the embodiments to avoid unnecessary limitations on the present invention. In addition, in order to simplify the drawings, some known and commonly used structures and elements will be depicted in the drawings in a simple schematic manner.

[0053] According to a preferred embodiment of the present invention, see Figure 2, a cooling system capable of realizing automatic liquid injection function is provided, comprising a heat exchanger, a converter and a liquid cooling pipeline connecting the heat exchanger and the converter. A circulating pump 8 is also arranged on the liquid cooling pipeline. The cooling system also comprises: a coolant tank 4 for storing coolant, wherein the coolant tank 4 also comprises a liquid level sensor 3 for detecting the liquid level of the coolant tank 4 in real time; an injection pump 5 connected to the coolant tank 4, and when the injection pump 5 is turned on, it is used to inject the coolant from the coolant tank 4 into the liquid cooling pipeline; and a control unit for controlling the start and stop operation of the injection pump 5, the start and stop operation of the circulating pump 8, and setting the dynamic hydraulic threshold and the static hydraulic threshold corresponding to the coolant state in the liquid cooling pipeline. Since the hydraulic value in the liquid cooling pipeline is greatly different when the coolant is flowing and stationary, the hydraulic threshold needs to be set separately according to the working conditions of the system. When the liquid level of the coolant tank 4 reaches the upper limit of the liquid level, the control unit is configured to start the injection pump 5, and the coolant is injected into the liquid cooling pipeline through the injection pump 5; when the coolant pressure in the liquid cooling pipeline reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump 5, and perform start and stop operations with the circulating pump 8 in a preset cycle, wherein the circulating pump 8 drives the coolant to circulate in the liquid cooling pipeline when it is started.

[0054] Advantageously, the present invention integrates the cooling system injection device into the cooling system, and controls the injection operation through the cooling system control unit. The liquid level sensor 3 on the coolant tank 4 is used to detect the liquid level of the coolant in the coolant tank 4, so as to determine whether the amount of coolant in the coolant tank 4 meets the injection requirement.

[0055] Furthermore, a breathing valve 2 is provided on the coolant tank 4 to connect the coolant tank 4 with the outside, to maintain the air pressure balance in the coolant tank 4, to facilitate the adjustment of the liquid level, and to allow the injection pump 5 to suck out the coolant from the coolant tank 4.

[0056] It can be understood that the breathing valve 2 is used to connect the inside and outside of the coolant tank 4, so that the coolant in the coolant tank 4 automatically flows into the injection pump 5 under the action of gravity to complete the pumping. Advantageously, the present invention realizes the automatic priming operation of the injection pump in the first injection, and then starts the injection process by detecting and judging the pressure in the cooling circuit, thereby realizing the automatic injection operation of the cooling system.

[0057] Preferably, the coolant tank 4 is also provided with a liquid filling port 1 for filling the coolant tank 4. It is understandable that an exhaust valve is also provided on the liquid cooling pipeline.

[0058] Preferably, a one-way valve 6 is further provided between the injection pump 5 and the liquid cooling pipeline, and the one-way valve 6 is used to prevent the coolant in the liquid cooling pipeline from flowing back into the coolant tank 4 .

[0059] According to another preferred embodiment of the present invention, in order to timely replenish the coolant consumed during the normal operation of the equipment, the present invention further provides an automatic refilling function for the cooling system, by real-time monitoring the system coolant pressure, once the pressure is lower than the hydraulic setting value under the current working state, the injection pump is promptly turned on to replenish the liquid, thereby improving the heat dissipation efficiency of the cooling system and reducing manual maintenance. In addition, since there is no need to stop the operation, the utilization rate of the equipment is also improved.

[0060] Specifically, when the circulation pump 8 is started, that is, the coolant in the liquid cooling pipeline is in a flowing state, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the dynamic hydraulic threshold, the control unit is configured to start the injection pump 5 to replenish the liquid in the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump 5.

[0061] Furthermore, when the circulation pump 8 is shut down, that is, the coolant in the liquid cooling pipeline is in a static state, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the static hydraulic threshold, the control unit is configured to start the injection pump 5 to replenish the liquid in the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump 5.

[0062] Preferably, the cooling system further comprises a temperature sensor, which is arranged on the liquid cooling pipeline, and the temperature sensor is used to monitor the coolant temperature at the liquid inlet end of the converter and output a temperature detection signal to the control unit. Wherein, when the circulating pump 8 is started, if the coolant temperature reaches the upper limit of the operating temperature, and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump 5 to replenish the liquid in the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump 5, thereby quickly increasing the heat dissipation capacity of the cooling system to the maximum.

[0063] It is understandable that, during the fluid replenishment process, the present invention first determines the operating state of the cooling system, and sets the fluid injection limit of the cooling system according to different operating states, thereby achieving optimal control of the cooling system pressure.

[0064] According to another preferred embodiment of the present invention, see Figure 3The cooling system also includes a first three-way valve 10 and a second three-way valve 11, the first end and the second end of the first three-way valve 10 are respectively connected to the coolant tank 4 and the injection pump 5, and the third end of the first three-way valve 10 is connected to an external coolant source; the first end and the second end of the second three-way valve 11 are respectively connected to the injection pump 5 and the liquid cooling pipeline, and the third end of the second three-way valve 11 is connected to the coolant tank 4.

[0065] Furthermore, when the liquid level in the coolant tank 4 is lower than the lower limit of the liquid level, the control unit is configured to turn off the injection pump 5 and add liquid to the coolant tank 4 .

[0066] Specifically, when the coolant tank 4 is filled with liquid for the first time, the first three-way valve 10 and the second three-way valve 11 are switched to allow the pipelines c and b to be connected, and liquid is added to the coolant tank 4 through the filling port 1. The coolant automatically flows into the filling pump 5 under the action of gravity until liquid flows back to the coolant tank 4 through the pipeline 12, completing the filling operation of the filling pump.

[0067] Then, the automatic liquid filling operation of the coolant tank 4 is started, the hose 9 is placed in the external coolant source, and the control unit automatically switches the three-way valve 10 to the pipeline a. Then the injection pump 5 is turned on to deliver the coolant to the coolant tank 4 through the pipelines a and b until the liquid level is higher than the upper limit of the liquid level, the injection pump 5 is turned off, and the first three-way valve 10 and the second three-way valve 11 are switched to make the pipelines c and d conductive, completing the automatic liquid filling operation of the coolant tank 4.

[0068] It is understandable that the subsequent liquid filling will no longer require the filling operation of the liquid filling pump 5, and the automatic liquid filling operation of the coolant tank 4 can be directly performed through the hose 9. After the first liquid filling operation of the coolant tank is completed, the liquid filling operation and / or liquid replenishment operation of the cooling system can be automatically controlled. Advantageously, the present invention uses a three-way valve to switch the liquid filling and liquid replenishment pipelines, thereby realizing automatic liquid filling of the coolant tank and minimizing human involvement.

[0069] According to another preferred embodiment of the present invention, an automatic liquid injection method for a cooling system is also provided. The cooling system includes a heat exchanger, a converter, and a liquid cooling pipeline connecting the heat exchanger and the converter, and a circulating pump 8 is also provided on the liquid cooling pipeline. The automatic liquid injection method includes the following steps:

[0070] Providing a coolant tank 4, and performing a liquid filling operation on the coolant tank 4;

[0071] A liquid level sensor 3 is provided, and the liquid level sensor 3 is arranged on the coolant tank 4, and is used for detecting the liquid level of the coolant tank 4 in real time;

[0072] A liquid injection pump 5 is provided, connected to the coolant tank 4, and when the liquid injection pump 5 is turned on, it is used to inject the coolant from the coolant tank 4 into the liquid cooling pipeline; and

[0073] A control unit is provided for controlling the start and stop operation of the injection pump 5, the start and stop operation of the circulation pump 8, and setting a dynamic hydraulic pressure threshold and a static hydraulic pressure threshold corresponding to the state of the coolant in the liquid cooling pipeline,

[0074] When the liquid level of the coolant tank 4 reaches the upper limit of the liquid level, the control unit is configured to start the injection pump 5, and the coolant is injected into the liquid cooling pipeline through the injection pump 5; when the coolant pressure in the liquid cooling pipeline reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump 5, and perform start and stop operations with a preset cycle by the circulating pump 8, wherein the circulating pump 8 drives the coolant to circulate in the liquid cooling pipeline when it is started.

[0075] Specifically, see Figure 4 , start filling the cooling system, add liquid to the coolant tank 4, and the liquid level sensor 3 detects the liquid level of the coolant tank 4. When the liquid level of the coolant tank 4 reaches the upper limit of the liquid level setting and the coolant pressure is less than the lower limit of the static hydraulic threshold, start the filling pump 5 for filling. When the coolant pressure reaches the upper limit of the static hydraulic threshold, stop the filling pump 5, and run the circulation pump 8 according to the start and stop cycle set by the program to vent the pipeline.

[0076] It can be understood that the injection operation is a preparatory work before the equipment is used for the first time. At this time, the coolant pressure in the cooling system pipeline is usually much smaller than the lower limit of the static hydraulic threshold. Therefore, when the liquid level in the coolant tank 4 reaches the upper limit of the liquid level, the judgment of whether the coolant pressure is less than the lower limit of the static hydraulic threshold can be omitted depending on the situation, and the injection pump can be directly turned on for injection.

[0077] Preferably, when the liquid level of the coolant tank 4 is lower than the lower limit of the liquid level, the injection pump 5 is stopped, a low liquid level alarm is issued, and the coolant tank 4 is filled with liquid.

[0078] In order to replenish the coolant consumed during the normal operation of the equipment in time, the present invention further provides a refilling function. Specifically, the automatic refilling method further includes: when the circulation pump 8 is started, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the dynamic hydraulic threshold, the control unit is configured to start the refilling pump 5 to refill the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to shut down the refilling pump 5.

[0079] Furthermore, the automatic liquid injection method also includes: when the circulation pump 8 is shut down, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit of the static hydraulic threshold, the control unit is configured to start the liquid injection pump 5 to replenish the liquid in the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the static hydraulic threshold, the control unit is configured to shut down the liquid injection pump 5.

[0080] Specifically, see Figure 5 , perform the cooling system refilling operation, when the liquid level of the coolant tank 4 is greater than the lower limit of the liquid level, when the coolant pressure is less than the lower limit of the pressure setting of the current operating state, start the liquid injection pump until the coolant pressure reaches the upper limit of the pressure setting of the current operating state, then stop the liquid injection pump. When the liquid level of the coolant tank 4 is less than the lower limit of the liquid level, a low liquid level alarm is issued, and the coolant tank 4 is filled with liquid.

[0081] Furthermore, the cooling system also includes a temperature sensor, which is arranged on the liquid cooling pipeline, and the temperature sensor is used to monitor the coolant temperature at the liquid inlet end of the converter and output a temperature detection signal to the control unit. The automatic liquid injection method also includes: when the circulation pump 8 is started, if the coolant temperature reaches the upper limit of the operating temperature, and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the liquid injection pump 5, replenish the liquid in the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to shut down the liquid injection pump 5.

[0082] Advantageously, the control unit determines the upper and lower limits of the dynamic hydraulic threshold and the upper and lower limits of the static hydraulic threshold according to the operating status of the circulating pump, so as to ensure that the pipeline pressure is within the normal demand range. When the equipment is operating normally, the control unit monitors the temperature of the coolant in the pipeline in real time. When the temperature is close to the derated operating temperature of the equipment, the circuit pressure is replenished to the maximum upper limit, so as to improve the heat dissipation capacity of the cooling system and ensure the full power operation of the equipment. When the coolant temperature is within the normal allowable range, the upper limit of the dynamic hydraulic threshold can be set according to different temperature ranges. The rehydration operation can be performed when the equipment is running or shut down.

[0083] Preferably, the automatic liquid injection method also includes: when the circulation pump 8 is started, the gas in the liquid cooling pipeline is collected together with the coolant circulation, and when the circulation pump 8 is stopped, the collected gas is discharged through an exhaust valve arranged on the liquid cooling pipeline.

[0084] According to another preferred embodiment of the present invention, a method for automatically adding liquid to the coolant tank 4 is also provided. Specifically, the step of adding liquid to the coolant tank 4 also includes:

[0085] The control unit switches the first three-way valve 10 and the second three-way valve 11 to form a fluid loop including the coolant tank 4, the first three-way valve 10, the injection pump 5, the second three-way valve 11 and the coolant tank 4 in sequence;

[0086] Add liquid through the liquid filling port 1 provided on the coolant tank 4;

[0087] The coolant in the coolant tank 4 automatically flows into the injection pump 5 through the first three-way valve 10 under the action of gravity until the coolant flows back to the coolant tank 4, completing the priming of the injection pump 5.

[0088] Preferably, the automatic liquid filling method further comprises: when the liquid level in the coolant tank 4 is lower than the lower limit value of the liquid level, the control unit is configured to turn off the liquid filling pump 5 and automatically add liquid to the coolant tank 4 .

[0089] Further, the control unit switches the first three-way valve 10 and the second three-way valve 11 to form a fluid path sequentially including the external coolant source, the first three-way valve 10, the injection pump 5, the second three-way valve 11 and the coolant tank 4; and the control unit is configured to turn on the injection pump 5 to automatically add liquid to the coolant tank 4 until the liquid level in the coolant tank 4 reaches the upper limit of the liquid level, completing the automatic addition operation of the coolant tank 4, and the control unit is configured to turn off the injection pump 5 and switch the first three-way valve 10 and the second three-way valve 11 to form a fluid path sequentially including the coolant tank 4, the first three-way valve 10, the injection pump 5, the second three-way valve 11 and the liquid cooling pipeline.

[0090] The present invention realizes automatic liquid filling of the cooling system pipeline before use through the mutual cooperation of the liquid level sensor 3, the liquid filling pump 5, the circulating pump 8 and the control unit. In addition, the first three-way valve 10 and the second three-way valve 11 are respectively connected to the coolant tank 4, the liquid filling pump 5, the liquid cooling pipeline and the external coolant source, and the automatic liquid filling function of the cooling system and the automatic liquid filling function of the coolant tank 4 are realized at the same time.

[0091] Although the present invention has been disclosed as above in the form of an implementation method, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the attached claims.

Claims

1. A cooling system capable of realizing an automatic liquid injection function, comprising a heat exchanger, a converter, and a liquid cooling pipeline connecting the heat exchanger and the converter, wherein a circulating pump is also provided on the liquid cooling pipeline, characterized in that: The cooling system further comprises: A coolant tank, used to store coolant, wherein the coolant tank further comprises a liquid level sensor, used to detect the liquid level of the coolant tank in real time; an injection pump connected to the coolant tank, and used to inject the coolant from the coolant tank into the liquid cooling pipeline when the injection pump is turned on; and a control unit, for controlling the start and stop operation of the injection pump, the start and stop operation of the circulation pump, and setting a dynamic hydraulic pressure threshold and a static hydraulic pressure threshold corresponding to the state of the coolant in the liquid cooling circuit, In which, the coolant tank is also provided with a breathing valve for connecting the inside and outside of the coolant tank, so that the coolant in the coolant tank automatically flows into the injection pump under the action of gravity to complete the pump filling. When the liquid level of the coolant tank reaches the upper limit of the liquid level, the control unit is configured to start the injection pump, and the coolant is injected into the liquid cooling pipeline via the injection pump; when the coolant pressure in the liquid cooling pipeline reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump, and the circulation pump performs start and stop operations with a preset cycle, wherein the circulation pump drives the coolant to circulate in the liquid cooling pipeline when it is started.

2. The cooling system according to claim 1, characterized in that: The coolant tank is also provided with a liquid filling port for filling the coolant tank.

3. The cooling system according to claim 1, characterized in that: The cooling system also includes a first three-way valve and a second three-way valve, wherein the first end and the second end of the first three-way valve are respectively connected to the coolant tank and the injection pump, and the third end of the first three-way valve is connected to an external coolant source; the first end and the second end of the second three-way valve are respectively connected to the injection pump and the liquid cooling pipeline, and the third end of the second three-way valve is connected to the coolant tank.

4. The cooling system according to claim 1, characterized in that: When the circulation pump is started, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

5. The cooling system according to claim 1, characterized in that: When the circulation pump is stopped, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the static hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the static hydraulic threshold, the control unit is configured to turn off the injection pump.

6. The cooling system according to claim 1, characterized in that: The cooling system further comprises a temperature sensor, which is arranged on the liquid cooling pipeline, and is used to monitor the coolant temperature at the liquid inlet end of the converter and output a temperature detection signal to the control unit. Among them, when the circulating pump is started, if the coolant temperature reaches the upper limit of the operating temperature and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

7. The cooling system according to claim 1, characterized in that: When the liquid level in the coolant tank is lower than a lower limit value of the liquid level, the control unit is configured to turn off the injection pump and add liquid to the coolant tank.

8. The cooling system according to claim 1, characterized in that: The cooling system further comprises a one-way valve connected between the injection pump and the liquid cooling pipeline, wherein the one-way valve is used to prevent the coolant in the liquid cooling pipeline from flowing back into the coolant tank.

9. The cooling system according to claim 1, characterized in that: The liquid cooling pipeline is also provided with an exhaust valve.

10. An automatic liquid injection method for a cooling system, wherein the cooling system comprises a heat exchanger, a converter and a liquid cooling pipeline connecting the heat exchanger and the converter, wherein a circulating pump is also provided on the liquid cooling pipeline, characterized in that: The automatic liquid injection method comprises the following steps: Providing a coolant tank and performing a liquid filling operation on the coolant tank; Providing a liquid level sensor, the liquid level sensor is arranged on the coolant tank and is used to detect the liquid level of the coolant tank in real time; Providing a liquid injection pump connected to the coolant tank, the liquid injection pump is used to inject the coolant from the coolant tank into the liquid cooling pipeline when it is turned on; and A control unit is provided for controlling the start and stop operation of the injection pump, the start and stop operation of the circulation pump, and setting a dynamic hydraulic pressure threshold and a static hydraulic pressure threshold corresponding to the state of the coolant in the liquid cooling pipeline, In which, the coolant tank is provided with a breathing valve, which connects the inside and the outside of the coolant tank. The coolant in the coolant tank automatically flows into the injection pump under the action of gravity to complete the pump filling. When the liquid level of the coolant tank reaches the upper limit of the liquid level, the control unit is configured to start the injection pump, and the coolant is injected into the liquid cooling pipeline through the injection pump; when the coolant pressure in the liquid cooling pipeline reaches the upper limit of the static hydraulic threshold, the control unit is configured to turn off the injection pump, and the circulation pump performs start and stop operations with a preset cycle, wherein the circulation pump drives the coolant to circulate in the liquid cooling pipeline when it is started.

11. The automatic liquid injection method according to claim 10, characterized in that: The cooling system further includes a first three-way valve and a second three-way valve, and the step of adding liquid to the coolant tank further includes: The control unit switches the first three-way valve and the second three-way valve to form a fluid loop including the coolant tank, the first three-way valve, the injection pump, the second three-way valve and the coolant tank in sequence; Adding liquid through a liquid filling port provided on the coolant tank; and The coolant in the coolant tank automatically flows into the injection pump via the first three-way valve under the action of gravity until the coolant flows back to the coolant tank, thus completing the priming of the injection pump.

12. The automatic liquid injection method according to claim 10, characterized in that: The cooling system further includes a first three-way valve and a second three-way valve, and the step of adding liquid to the coolant tank further includes: The control unit switches the first three-way valve and the second three-way valve to form a fluid path including an external coolant source, the first three-way valve, the injection pump, the second three-way valve and the coolant tank in sequence; and The control unit is configured to start the injection pump to automatically add liquid to the coolant tank until the liquid level in the coolant tank reaches the upper limit of the liquid level. The control unit is configured to turn off the injection pump and switch the first three-way valve and the second three-way valve to form a fluid path that sequentially includes the coolant tank, the first three-way valve, the injection pump, the second three-way valve and the liquid cooling pipeline.

13. The automatic liquid injection method according to claim 10, characterized in that: The automatic liquid injection method also includes: When the liquid level in the coolant tank is lower than a lower limit value of the liquid level, the control unit is configured to turn off the injection pump and automatically add liquid to the coolant tank.

14. The automatic liquid injection method according to claim 10, characterized in that: The automatic liquid injection method also includes: When the circulation pump is started, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

15. The automatic liquid injection method according to claim 10, characterized in that: The automatic liquid injection method also includes: When the circulation pump is stopped, if the coolant pressure in the liquid cooling pipeline is lower than the lower limit value of the static hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling pipeline, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit value of the static hydraulic threshold, the control unit is configured to turn off the injection pump.

16. The automatic liquid injection method according to claim 10, characterized in that: The cooling system further comprises a temperature sensor, which is arranged on the liquid cooling pipeline, and the temperature sensor is used to monitor the coolant temperature at the liquid inlet end of the converter and output a temperature detection signal to the control unit; as well as The automatic liquid injection method also includes: When the circulation pump is started, if the coolant temperature reaches the upper limit of the operating temperature and the coolant pressure is lower than the upper limit of the dynamic hydraulic threshold, the control unit is configured to start the injection pump to replenish the liquid cooling circuit, and the coolant pressure continues to increase. When the coolant pressure reaches the upper limit of the dynamic hydraulic threshold, the control unit is configured to turn off the injection pump.

17. The automatic liquid injection method according to claim 10, characterized in that: The automatic liquid injection method also includes: When the circulation pump is started, the gas in the liquid cooling pipeline is collected together with the coolant circulation, and when the circulation pump is stopped, the collected gas is discharged through the exhaust valve arranged on the liquid cooling pipeline.

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