Precise temperature control liquid cooling system

Abstract

The utility model discloses a precise temperature control liquid cooling system which comprises a water pump, a controller, a proportional three-way valve and a cold storage water tank, the water outlet end of the water pump is connected with the water inlet end of a load, the water outlet end of the load is connected with one water inlet valve port of the proportional three-way valve, and the water outlet valve port of the proportional three-way valve is connected with the water inlet end of the water pump. The cold storage water tank is provided with a liquid cooling device and a heater, the water outlet end of the cold storage water tank is connected with the other water inlet valve port of the proportional three-way valve, and the load water outlet end is further connected with the water inlet end of the cold storage water tank. Temperature sensors are arranged in the cold storage water tank, at the water outlet end of the water pump and at the water outlet end of the load respectively and electrically connected with a controller, and the controller is further electrically connected with the liquid cooling device, the heater and the proportional three-way valve. The requirement for temperature control in the cold storage water tank is low, an inverter compressor is not needed, and therefore the purpose of accurate temperature control can be achieved by selecting a fixed-frequency compressor low in cost.

Description

Technical Field

[0001] The utility model relates to the field of liquid cooling systems, in particular to a precise temperature-controlled liquid cooling system. Background Art

[0002] With the extensive use of electronic equipment, the heat load of electronic equipment is also increasing, and the working environment temperature of electronic equipment also affects its reliability and life. Therefore, electronic equipment has higher and higher requirements for the cooling capacity and temperature control accuracy of the cooling system. Therefore, the current liquid cooling system must meet the requirements of large cooling capacity and high temperature control accuracy. In addition, the existing technology generally uses variable frequency compressors to dynamically adjust the output of cooling capacity to meet the requirements of control accuracy, but the variable frequency compressor has a small cooling capacity, high cost, and poor electromagnetic compatibility performance, which will affect the normal operation of the electronic cabinet and generally cannot meet the requirements of high cooling capacity and electromagnetic compatibility. Utility Model Content

[0003] The utility model provides a precise temperature control liquid cooling system to solve the problem that the prior art electronic equipment liquid cooling system requires a variable frequency compressor to achieve precise temperature control.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A precise temperature-controlled liquid cooling system comprises a water pump for supplying liquid to a load, a controller, a proportional three-way valve, and a cold storage water tank, wherein the water outlet of the water pump is connected to the water inlet of the load through a pipeline, the water outlet of the load is connected to one water inlet valve port of the proportional three-way valve through a pipeline, the water outlet valve port of the proportional three-way valve is connected to the water inlet of the water pump through a pipeline, thereby forming a main liquid supply system; the cold storage water tank is provided with a liquid cooling device and a heater, the liquid cooling device realizes cooling of the coolant in the cold storage water tank, the heater realizes heating of the coolant in the cold storage water tank, the water outlet of the cold storage water tank is connected to the other water inlet valve port of the proportional three-way valve through a pipeline, and the water outlet of the load is also connected to the water inlet of the cold storage water tank through another pipeline;

[0006] Temperature sensors are installed in the cold storage water tank, the water pump outlet pipeline, and the load outlet pipeline respectively. Each temperature sensor is electrically connected to the controller for signal transmission. The controller is also electrically connected to the liquid cooling device, the heater, and the proportional three-way valve control.

[0007] Furthermore, a filter is connected to the pipeline between the water outlet of the proportional three-way valve and the water inlet of the water pump.

[0008] Furthermore, the two pipelines at the water outlet of the load are respectively connected to a one-way valve.

[0009] Furthermore, the cold storage water tank is connected to a constant pressure expansion tank.

[0010] Furthermore, the cold storage water tank has a liquid filling port and a liquid discharge port, and the cold storage water tank is also connected to an automatic exhaust valve.

[0011] The load return water of the utility model does not directly flow into the cold storage water tank. The load return water is mixed with the coolant in the cold storage water tank at the proportional three-way valve outside the cold storage water tank, and the cooling capacity output is adjusted by the mixing ratio of cold and hot water. The utility model does not need to use a variable frequency compressor, but only needs to use a fixed frequency compressor for cold storage (that is, there is no need to adjust the cooling capacity output capacity of the compressor), and uses a proportional three-way valve to mix the low-temperature coolant in the cold storage water tank with the load return water, and achieves the purpose of precise temperature control by adjusting the flow of the two-way branch.

[0012] This method has lower requirements for temperature control in the cold storage water tank and does not require a variable frequency compressor. Therefore, a low-cost fixed-frequency compressor can be selected to achieve the purpose of precise temperature control. It has the advantages of simple control, low cost, and good electromagnetic compatibility. It can adaptively change the cooling output from 0 to 100% according to changes in heat load, and can achieve a cooling output several times the rated heat exchange capacity in a short time.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1) The compressor can use a conventional fixed frequency compressor, which has a wide range of choices, simple control and good electromagnetic compatibility performance.

[0015] 2) According to actual requirements, the size of the cold storage water tank can be matched, and the cooling output of several times the rated heat exchange capacity of the liquid cooling device can be achieved in a short time through cold storage.

[0016] 3) By mixing cold and hot water in proportion, the temperature transition is smooth and the temperature control accuracy is high, reaching ±0.5℃. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.

[0018] Figure 2 This is a working logic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, this embodiment discloses a precise temperature control liquid cooling system, including a controller, a water pump 1, a first temperature sensor 2, a second temperature sensor 5, a proportional three-way valve 6, a heater 7, a third temperature sensor 8, a cold storage water tank 9, a constant pressure expansion tank 11, a liquid cooling device 13, and a filter 15.

[0021] The water pump 1 is used to supply liquid to the load 3. Specifically, the water outlet end of the water pump 1 is connected to the water inlet end of the load 3 through a pipeline. The water outlet end of the load 3 is connected to a main-branch pipeline. The main-branch pipeline has a main pipe and two branches, wherein the main pipe of the main-branch pipeline is connected to the water outlet end of the load 3, one branch pipe in the main-branch pipeline is connected to the water inlet end of a one-way valve 4, the water outlet end of the one-way valve 4 is connected to an inlet valve port of a proportional three-way valve 6 through a pipeline, the outlet valve port of the proportional three-way valve 6 is connected to the water inlet end of the filter 15 through a pipeline, and the water outlet end of the filter 15 is connected to the water inlet end of the water pump 1 through a pipeline, thereby forming a main liquid supply system.

[0022] The top of the cold storage water tank 9 has a liquid injection port, the bottom has a liquid discharge port, and the top of the cold storage water tank 9 is installed with an automatic exhaust valve 10. A heater 7 is installed inside the cold storage water tank 9, and the heater 7 is used to achieve the temperature increase of the cold storage water tank 9; the cold storage water tank 9 is also connected to the liquid cooling device 13 to form a loop, and the liquid cooling device 13 is used to cool the cold storage water tank 9. The water outlet of the cold storage water tank 9 is connected to another water inlet valve port of the proportional three-way valve 6 through a pipeline, and another branch pipe in the main branch pipeline of the water outlet of the load 3 is connected to the inlet end of the cold storage water tank 9. The purpose of adjusting the liquid supply temperature is achieved by mixing the hot water returned by the load 3 with the cold water discharged from the cold storage water tank 9.

[0023] A first temperature sensor 2 is installed in the pipeline between the water outlet end of the water pump 1 and the water inlet end of the load 3, a second temperature sensor 5 is installed in the main pipe of the main branch pipeline at the water outlet end of the load 3, and a third temperature sensor 8 is arranged in the cold storage water tank 9. The first temperature sensor 2, the second temperature sensor 5, and the third temperature sensor 8 are respectively electrically connected to the controller for signal transmission, and the controller is respectively electrically connected to the heater 7, the liquid cooling device 13, and the proportional three-way valve 6. Therefore, the controller can control the operation of the heater 7, the liquid cooling device 13, and the proportional three-way valve 6 based on the temperature data collected by each temperature sensor.

[0024] After turning on the power of the liquid cooling device, set the liquid supply temperature to T 设 ℃, the liquid cooling device 13 works to reduce the temperature of the coolant in the cold storage water tank 9 to T1℃ (i.e. the temperature of the temperature sensor 8).

[0025] Turn on the water pump 1. Under the action of the water pump 1, the coolant in the cold storage water tank 9 flows into the main liquid supply system through the proportional three-way valve 6. After being fully mixed with the return water of the load 3, the coolant that meets the supply temperature T0 (i.e., the temperature of the temperature sensor 2) is obtained through the water pump 1, and then passes through the load 3 to complete the refrigeration cycle.

[0026] The filter 15 installed between the water pump 1 and the proportional three-way valve 6 can filter impurities in the coolant of the liquid cooling device to ensure that there are no large particles in the coolant. The cold storage water tank 9 is also connected to the constant pressure expansion tank 11, and the constant pressure expansion tank 11 can maintain the internal pressure of the cold storage water tank 9 constant.

[0027] The top filling port 12 and the bottom drain port 14 of the cold storage water tank 9 are used to replenish and drain the coolant, respectively. The automatic exhaust valve 10 at the top of the cold storage water tank 9 is used to drain the air in the system.

[0028] The first temperature sensor 2 on the outlet pipe of the water pump 1 is used to monitor the temperature at the outlet of the water pump 1 and the supply liquid temperature T0. The second temperature sensor 5 on the outlet pipe of the load 3 is used to monitor the return liquid temperature T2. The third temperature sensor 8 in the cold storage water tank 9 is used to monitor the coolant temperature T1 in the cold storage water tank 9.

[0029] like Figure 2 As shown, the precise temperature control method of this embodiment includes the following steps:

[0030] Turn on the power of the liquid cooling device and set the liquid supply temperature to T 设 , detect the coolant temperature T1 in the cold storage water tank 9:

[0031] When T1<T 设 -N℃, the heater 7 works to raise the coolant temperature in the cold storage tank 9 to T 1a Up to T 设 -N℃, when the temperature is reached, the heater 7 stops working.

[0032] Detect the coolant temperature T in the cold storage water tank 9 1a , judge T 1a Is it in T 设 ±2℃ range, if not, then work in this state; otherwise when T 设 >T 1a ≥T 设 -2℃, at this time, the liquid cooling device 13 works, and the coolant temperature in the cold storage water tank 9 is T 1a Down to T 设 -N℃, when the temperature is reached, the liquid cooling device 13 stops working.

[0033] At this time, the water pump 1 starts to work, and the temperature sensor 2 arranged on the outlet pipeline of the water pump 1 detects the liquid supply temperature T0.

[0034] Determine whether T0 is within T 设 If it is within the range of ±0.5℃, it will work according to this state; otherwise, it will be divided into the following two cases:

[0035] When T0>T 设+0.5℃, the opening of the proportional three-way valve 6 is adjusted to increase the flow output of the cold storage water tank 9 and reduce the flow output of the main liquid supply circuit. After each adjustment of the opening of the proportional three-way valve 6 is completed, T0=T 设 ±0.5℃ detection, when T0 is already at T 设 Within the range of ±0.5℃, if yes, then work according to this state;

[0036] When T0<T 设 -0.5℃, the proportional three-way valve 6 is adjusted to reduce the flow output of the cold storage water tank 9 and increase the flow output of the main liquid supply circuit. After each adjustment of the proportional three-way valve 6, T0=T 设 ±0.5℃ detection, when T0 is already at T 设 Within the range of ±0.5℃, if yes, then work according to this state;

[0037] When T 设 ≥T1, the liquid cooling device 13 works to raise the temperature of the coolant in the cold storage water tank 9 to T 1a ℃,T 1a =T 设 ±0.5℃, at this time water pump 1 starts working and works according to this state.

[0038] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. Such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0039] The present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A precise temperature-controlled liquid cooling system, comprising a water pump for supplying liquid to a load, characterized in that: It also includes a controller, a proportional three-way valve, and a cold water storage tank. The water outlet of the water pump is connected to the water inlet of the load through a pipeline, the water outlet of the load is connected to one water inlet valve port of the proportional three-way valve through a pipeline, and the water outlet valve port of the proportional three-way valve is connected to the water inlet of the water pump through a pipeline, thereby forming a main liquid supply system; the cold water storage tank is equipped with a liquid cooling device and a heater, the liquid cooling device realizes the cooling of the coolant in the cold water storage tank, and the heater realizes the heating of the coolant in the cold water storage tank, the water outlet of the cold water storage tank is connected to the other water inlet valve port of the proportional three-way valve through a pipeline, and the water outlet of the load is also connected to the water inlet of the cold water storage tank through another pipeline; Temperature sensors are installed in the cold storage water tank, the water pump outlet pipeline, and the load outlet pipeline respectively. Each temperature sensor is electrically connected to the controller for signal transmission. The controller is also electrically connected to the liquid cooling device, the heater, and the proportional three-way valve control.

2. A precise temperature control liquid cooling system according to claim 1, characterized in that: The pipeline between the water outlet of the proportional three-way valve and the water inlet of the water pump is connected to a filter.

3. The precise temperature control liquid cooling system according to claim 1, characterized in that: The two pipelines at the load water outlet are respectively connected to a one-way valve.

4. The precise temperature control liquid cooling system according to claim 1, characterized in that: The cold storage water tank is connected with a constant pressure expansion tank.

5. The precise temperature control liquid cooling system according to claim 1, characterized in that: The cold storage water tank has a liquid injection port and a liquid discharge port, and is also connected to an automatic exhaust valve.

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