Pulsating heat pipe assisted wide-environment-temperature liquid cooling system

Abstract

The utility model discloses a pulsating heat pipe assisted wide-environment-temperature liquid cooling system which comprises a solution tank, and the solution tank and a load form a secondary refrigerant circulation loop. The refrigerant circulation loop is composed of a compressor, a plate heat exchanger, an expansion valve, a radiator and a gas-liquid separator, and the heat exchanger, the three electromagnetic valves, the four-way reversing valve and the heat pipe are matched through the four-way reversing valve and the three electromagnetic valves. When the low-temperature secondary refrigerant needs to be heated, the high-temperature refrigerant output by the compressor heats the low-temperature secondary refrigerant in the solution box in the heat exchanger through the heat pipe, and the low-temperature secondary refrigerant returned by the load is heated through the plate heat exchanger; when the high-temperature secondary refrigerant needs to be cooled, the high-temperature refrigerant output by the compressor passes through the radiator and the expansion valve to form a low-temperature refrigerant, then the secondary refrigerant returned by the load is cooled through the plate heat exchanger, and then the secondary refrigerant in the solution box is cooled. The utility model can effectively reduce the energy consumption of the cold liquid air conditioning equipment.

Description

Technical Field

[0001] The utility model relates to the field of cold liquid air conditioning systems, in particular to a wide-circuit-temperature liquid cooling system assisted by a pulsating heat pipe. Background Art

[0002] In the cold liquid air conditioning system, ethylene glycol solution is generally used as the refrigerant, and the freezing point of ethylene glycol solution will change with the concentration of ethylene glycol solution in the aqueous solution, and as the ambient temperature decreases, the kinematic viscosity of ethylene glycol solution continues to increase. Therefore, when the cold liquid air conditioning system works in a low temperature environment, the flow resistance of the ethylene glycol solution with increased viscosity increases, resulting in the need to increase the head of the circulating pump in the cold liquid air conditioning system accordingly, and the instantaneous current of the circulating pump increases when starting. The above performance of ethylene glycol at low temperatures will increase the cost and risk of using the cold liquid air conditioning system. The measures to reduce the influence of the flow resistance of the refrigerant in the industry are mainly to add an electric heating device to the solution tank, which can usually achieve the preheating of the coolant temperature from -40℃ to -15℃ within 10 minutes. However, the power consumption of the additional electric heating device is proportional to the volume of the solution tank, and the power consumption is large, which has the problem of high energy consumption. At the same time, in the cold liquid air conditioning system, the condensation heat is generally discharged directly to the outside as waste heat, which has the problem of energy waste. If the condensation heat can be fully utilized to heat the low-temperature refrigerant in the solution tank when needed, it will undoubtedly reduce the energy consumption of the cold liquid air conditioning system. Utility Model Content

[0003] The utility model provides a wide-circuit-temperature liquid cooling system assisted by a pulsating heat pipe, so as to solve the problem of high energy consumption in the prior art cold liquid air conditioning system due to the increased viscosity of the refrigerant in a low-temperature environment.

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

[0005] A pulsating heat pipe-assisted wide-circuit temperature liquid cooling system comprises a solution tank (201), wherein the solution tank (201) contains a coolant, and the solution tank (201) is connected to an external load to form a coolant circulation loop; and further comprises a heat exchanger (301), a first solenoid valve (401), a second solenoid valve (402), a third solenoid valve (403), a compressor (501), a four-way reversing valve (601), a gas-liquid separator (701), a radiator (801) equipped with a fan, an expansion valve (1001), a plate heat exchanger (1101), and a heat pipe (1201), wherein:

[0006] The refrigerant outlet end of the compressor (501) is connected to the first valve port of the four-way reversing valve (601), and the second valve port of the four-way reversing valve (601) is connected to one end of the first solenoid valve (401); the other end of the first solenoid valve (401) is respectively connected to one end of the flow channel in the heat exchanger (301) and one end of the third solenoid valve (403), and the other end of the flow channel in the heat exchanger (301) is connected to one end of the second solenoid valve (402); the heat pipe (1201) is a pulsating heat pipe, the heating section of the heat pipe (1201) is arranged in the solution tank (201), and the cooling section of the heat pipe (1201) is arranged outside the solution tank (201) and keeps contact with the heat exchanger (301);

[0007] The plate heat exchanger (1101) has two groups of flow channels, the other end of the second solenoid valve (402) and the other end of the third solenoid valve (403) are respectively connected to one end of the first group of flow channels in the plate heat exchanger (1101), the other end of the first group of flow channels in the plate heat exchanger (1101) is connected to one end of the expansion valve (1001), one end of the second group of flow channels in the plate heat exchanger (1101) is for the coolant returned by the load to enter, and the other end of the second group of flow channels in the plate heat exchanger (1101) is connected to the solution tank (201);

[0008] The other end of the expansion valve (1001) is connected to one end of the radiator (801), the other end of the radiator (801) is connected to the third valve port of the four-way reversing valve (601), the fourth valve port of the four-way reversing valve (601) is connected to the inlet end of the gas-liquid separator (701), and the outlet end of the gas-liquid separator (701) is connected to the refrigerant inlet end of the compressor (501).

[0009] Furthermore, the coolant is an ethylene glycol aqueous solution with a concentration of 66%.

[0010] Furthermore, the solution tank (201) is provided with a temperature sensor (1301) for collecting the temperature of the coolant in the solution tank (201).

[0011] Furthermore, the heat pipe is a pulsating heat pipe formed by bending a copper pipe.

[0012] Furthermore, the heat exchanger (301) is a shell-and-tube heat exchanger.

[0013] Furthermore, the radiator (801) is a fin-type radiator.

[0014] In the utility model, the high-temperature refrigerant output by the compressor can be switched to different flow directions through the four-way reversing valve. When the ambient temperature is low, resulting in low temperatures of the refrigerant in the solution tank and the refrigerant returned by the load, the high-temperature refrigerant sucked into the compressor from the gas-liquid separator is switched by the four-way reversing valve to enter the heat exchanger through the first solenoid valve, and the low-temperature refrigerant in the solution tank is heated through the heat exchanger and the heat pipe, and then the refrigerant can also enter the plate heat exchanger through the second solenoid valve to exchange heat with the low-temperature refrigerant returned by the load, thereby realizing the heating of the low-temperature refrigerant through the compressor condensation heat.

[0015] When the ambient temperature is high, resulting in a high temperature of the refrigerant in the solution tank and returned by the load, the high-temperature refrigerant sucked from the gas-liquid separator to the compressor is switched by the four-way reversing valve to the low-temperature refrigerant after passing through the radiator and throttling device and entering the plate heat exchanger. In the plate heat exchanger, heat is exchanged with the high-temperature refrigerant returned by the load, so that the refrigerant is cooled before entering the solution tank, thereby reducing the temperature of the refrigerant in the solution tank. Finally, the refrigerant flowing out of the plate heat exchanger directly returns to the gas-liquid separator through the third solenoid valve and the four-way reversing valve.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. Reduce the effect of coolant viscosity changes on system working resistance and power when the liquid cooling device is working in a low temperature environment, thereby reducing the starting current and lift of the circulating pump in the cold liquid air conditioning equipment.

[0018] 2. Use heat pipes to replace electric heating devices to preheat the coolant in the solution tank, which greatly reduces power consumption, eliminates electric heating devices and their configured thermal protectors, reduces the use of components, and reduces costs. The heat pipe is a pulsating heat pipe formed by bending a metal copper tube, which has a simple structure, is easy to manufacture and maintain, and has a high heat transfer efficiency, and can efficiently utilize the heat at the compressor outlet.

[0019] 3. In the utility model, solenoid valves are connected to the two branches of the heat exchanger, and a temperature sensor is connected to the solution tank. When the sensor detects whether the internal temperature has reached the preheating temperature, such as -15°C, the opening and closing of the solenoid valve can be used to select whether to perform work recovery, thereby intelligently realizing the temperature control of the solution tank.

[0020] 4. It can meet the liquid supply needs in high and low temperature environments. The fluorine system cooling and heating are switched by a four-way reversing valve. Compared with the commonly used system electric heating device, it requires additional protection devices, reduces the number of electronic components in the system, has a simple structure, reduces energy consumption, and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, this embodiment discloses a wide-circuit temperature liquid cooling system assisted by a pulsating heat pipe, including a solution tank 201, wherein the solution tank 201 contains a coolant, and the coolant is a 66% ethylene glycol aqueous solution. The liquid outlet of the solution tank 201 is connected to the inlet of the circulating pump 101 through a pipeline, and the outlet of the circulating pump 101 is connected to the load through a pipeline. The circulating pump 101 transports the coolant in the solution tank 201 to the load, and the coolant returned by the load returns to the solution tank 201 through the liquid return end of the solution tank 201, thereby forming a coolant circulation loop. The solution tank 201 is equipped with a temperature sensor 1301, and the temperature sensor 1301 is used to detect the temperature of the coolant in the solution tank 201. The solution tank 201 is also equipped with a heat pipe 1201 , which is a pulsating heat pipe formed by bending a metal copper tube. The heating section of the heat pipe 1201 is arranged in the solution tank 201 and contacts with the coolant, and the cooling section of the heat pipe 1201 is arranged outside the solution tank 201 .

[0024] It also includes a heat exchanger 301, a first solenoid valve 401, a second solenoid valve 402, a third solenoid valve 403, a compressor 501, a four-way reversing valve 601, a gas-liquid separator 701, a radiator 801 equipped with a fan 901, an expansion valve 1001, and a plate heat exchanger 1101, wherein the heat exchanger 301 is a shell-and-tube heat exchanger, and the radiator 801 is a finned radiator.

[0025] The outlet end of the gas-liquid separator 701 is connected to the refrigerant inlet end of the compressor 501 through a pipeline, the refrigerant outlet end of the compressor 501 is connected to the first valve port a of the four-way reversing valve 601 through a pipeline, and the second valve port b of the four-way reversing valve 601 is connected to one end of the first electromagnetic valve 401 through a pipeline. The other end of the first electromagnetic valve 401 is connected to two pipelines, one of which is connected to one end of the flow channel in the heat exchanger 301, and the other is connected to one end of the third electromagnetic valve 403. The other end of the flow channel in the heat exchanger 301 is connected to one end of the second electromagnetic valve 402 through a pipeline. The cooling section of the heat pipe 1201 configured in the solution tank 201 is in contact with the heat exchanger 301.

[0026] The plate heat exchanger 1101 has two groups of flow channels, wherein the first group of flow channels are refrigerant flow channels, and the second group of flow channels are coolant flow channels. The other end of the second solenoid valve 402 and the other end of the third solenoid valve 403 are respectively connected to one end of the first group of flow channels in the plate heat exchanger 1101 through pipelines, the other end of the first group of flow channels in the plate heat exchanger 1101 is connected to one end of the expansion valve 1001 through a pipeline, the other end of the expansion valve 1001 is connected to one end of the radiator 801 through a pipeline, the other end of the radiator 801 is connected to the third valve port c of the four-way reversing valve 601 through a pipeline, and the fourth valve port d of the four-way reversing valve 601 is connected to the inlet end of the gas-liquid separator 701. In the plate heat exchanger 1101, one end of the second group of flow channels is for the coolant returned by the load to enter, and the other end of the second group of flow channels in the plate heat exchanger 1101 is connected to the return liquid end of the solution tank 201 through a pipeline.

[0027] The working process of this embodiment is as follows:

[0028] (1) When the temperature of the coolant in the solution tank 201 and the return of the load needs to be increased under low temperature conditions, the first solenoid valve 401 and the second solenoid valve 402 are controlled to be turned on, and the third battery valve is turned off. The refrigerant sucked from the gas-liquid separator 701 into the compressor 501 is compressed into a high-temperature and high-pressure gas by the compressor 501, and then enters the flow channel of the heat exchanger 301 through the four-way reversing valve 601 and the first solenoid valve 401. The high-temperature refrigerant exchanges heat with the cooling section of the heat pipe 1201 through the heat exchanger 301, and conducts heat to the heating section through the heat pipe 1201, so that the low-temperature coolant in the solution tank 201 is heated and heated.

[0029] The refrigerant liquid flowing out of the heat exchanger 301 passes through the second solenoid valve 402 and enters the first flow channel of the plate heat exchanger 1101. In the plate heat exchanger 1101, the heat not collected by the refrigerant is heat-exchanged with the low-temperature coolant return liquid returned by the load through the plate heat exchanger 1101, thereby heating the coolant return liquid. The heated coolant returns to the solution tank 201 through the second flow channel of the plate heat exchanger 1101. The refrigerant flowing out of the first flow channel of the plate heat exchanger 1101 passes through the electronic expansion valve 1001 and the radiator 801, and then returns to the gas-liquid separator 701 through the four-way reversing valve 601, thereby completing the circulation of the refrigerant.

[0030] Among them, when the refrigerant passes through the heat exchanger 301, the high-temperature refrigerant output by the compressor 501 is fully utilized, and then circulated through the throttling device 1001 and the radiator 801. In the cold liquid air conditioning system of the prior art, the compressor outlet is discharged to the atmosphere, resulting in energy waste, while this embodiment can realize the first stage of compressor heat work recovery through the heat exchanger 301, and then realize the second stage of work recovery through the plate heat exchanger 1101. The heat recovered by the compressor is used to heat the low-temperature refrigerant, thereby reducing energy consumption. When the temperature sensor 1301 in the solution tank 201 detects that the temperature reaches the target temperature, the second solenoid valve 402 is closed, and the heating in the solution tank 201 is no longer performed.

[0031] (2) When the temperature of the coolant in the solution tank 201 and the coolant returned by the load needs to be lowered under high temperature, the second battery valve 401 is closed to make the first solenoid valve 401 and the third solenoid valve 403 conductive. At this time, the four-way reversing valve 601 is used to switch the output direction of the compressor 501, so that the high-temperature and high-pressure gas refrigerant compressed by the compressor 501 flows to the radiator 801 through the four-way reversing valve 601, and then passes through the radiator 801 and the cooling fan 901 configured therein to dissipate heat to the air, and the expansion valve 1001 throttles and cools down the temperature, forming the first flow channel for the low-temperature refrigerant to enter the plate heat exchanger 1101. In the plate heat exchanger 1101, the low-temperature refrigerant exchanges heat with the high-temperature coolant returned from the load, so that the coolant temperature is reduced and then enters the solution tank 201, thereby reducing the coolant temperature in the solution tank 201. The refrigerant flowing out of the plate heat exchanger 1101 then passes through the third solenoid valve 403 and the first solenoid valve 401 in sequence and returns to the four-way reversing valve 601, and is returned to the gas-liquid separator 701 by the four-way reversing valve 601.

[0032] 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.

[0033] 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 pulsating heat pipe assisted wide temperature liquid cooling system, characterized in that: The invention comprises a solution tank (201), wherein the solution tank (201) contains a coolant, and the solution tank (201) is connected to an external load to form a coolant circulation loop; and further comprises a heat exchanger (301), a first solenoid valve (401), a second solenoid valve (402), a third solenoid valve (403), a compressor (501), a four-way reversing valve (601), a gas-liquid separator (701), a radiator (801) equipped with a fan, an expansion valve (1001), a plate heat exchanger (1101), and a heat pipe (1201), wherein: The refrigerant outlet end of the compressor (501) is connected to the first valve port of the four-way reversing valve (601), and the second valve port of the four-way reversing valve (601) is connected to one end of the first solenoid valve (401); the other end of the first solenoid valve (401) is respectively connected to one end of the flow channel in the heat exchanger (301) and one end of the third solenoid valve (403), and the other end of the flow channel in the heat exchanger (301) is connected to one end of the second solenoid valve (402); the heat pipe (1201) is a pulsating heat pipe, the heating section of the heat pipe (1201) is arranged in the solution tank (201), and the cooling section of the heat pipe (1201) is arranged outside the solution tank (201) and keeps contact with the heat exchanger (301); The plate heat exchanger (1101) has two groups of flow channels, the other end of the second solenoid valve (402) and the other end of the third solenoid valve (403) are respectively connected to one end of the first group of flow channels in the plate heat exchanger (1101), the other end of the first group of flow channels in the plate heat exchanger (1101) is connected to one end of the expansion valve (1001), one end of the second group of flow channels in the plate heat exchanger (1101) is for the coolant returned by the load to enter, and the other end of the second group of flow channels in the plate heat exchanger (1101) is connected to the solution tank (201); The other end of the expansion valve (1001) is connected to one end of the radiator (801), the other end of the radiator (801) is connected to the third valve port of the four-way reversing valve (601), the fourth valve port of the four-way reversing valve (601) is connected to the inlet end of the gas-liquid separator (701), and the outlet end of the gas-liquid separator (701) is connected to the refrigerant inlet end of the compressor (501).

2. A pulsating heat pipe assisted wide temperature liquid cooling system according to claim 1, characterized in that: The cooling agent is an ethylene glycol aqueous solution with a concentration of 66%.

3. The pulsating heat pipe-assisted wide-circuit temperature liquid cooling system according to claim 1, characterized in that: The solution tank (201) is provided with a temperature sensor (1301) for collecting the temperature of the coolant in the solution tank (201).

4. The pulsating heat pipe assisted wide temperature liquid cooling system according to claim 1, characterized in that: The heat pipe is a pulsating heat pipe formed by bending a copper pipe.

5. The pulsating heat pipe assisted wide temperature liquid cooling system according to claim 1, characterized in that: The heat exchanger (301) is a shell-and-tube heat exchanger.

6. The pulsating heat pipe assisted wide temperature liquid cooling system according to claim 1, characterized in that: The radiator (801) is a fin-type radiator.

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