CN-115604996-B - Large-load constant-temperature liquid supply cooling device and temperature control method

Abstract

The invention discloses a large-load constant-temperature liquid supply cooling device and a temperature control method, comprising three large units of cold accumulation, temperature control and liquid supply, the cold accumulation, the temperature control and the liquid supply form a plurality of circulation loops which are mutually independent and cooperated. After the cooling liquid in the liquid supply unit absorbs the load heat, heat exchange is carried out in the heat exchanger of the temperature control unit with the low-temperature liquid in the cold accumulation unit, and according to feedback of the temperature sensor and the flow sensor, the flow of cold and hot fluid entering the heat exchanger is automatically regulated through the frequency conversion of the temperature control circulating pump in the temperature control unit, the opening regulating functions of the electric two-way regulating valve and the electric three-way regulating valve, so that the temperature of the cooling liquid in the buffer water tank is maintained in the liquid supply temperature range, and then the effect of continuously cooling the heat load is achieved. The invention provides a new temperature control strategy and designs the constant temperature liquid supply device, thereby solving the defects of unstable temperature control, insufficient liquid supply flow and the like in the cooling process of the heavy load equipment of the existing liquid cooling system and having great practical value.

Inventors

• HU LIANG
• GE WENBIAO
• WAN YUAN

Assignees

• 湖北三江航天红林探控有限公司

Dates

Publication Date

20260512

Application Date

20221025

Claims (8)

1. 1. The large-load constant-temperature liquid supply cooling device is characterized by comprising a cold accumulation unit A, a temperature control unit B and a liquid supply unit C which are mutually independent and cooperatively act; The cold accumulation unit A comprises a refrigeration host (1), a cold accumulation water tank (3) and a cold accumulation circulating pump (32) which form a circulating loop through pipelines; The temperature control unit B comprises a heat exchanger (7), a buffer water tank (9), a second electric two-way regulating valve (26), a temperature control circulating pump (28) and an electric three-way regulating valve (21), and the temperature control unit B takes the heat exchanger (7) as a core to form two groups of circulating loops: The cold storage water tank (3), the first temperature sensor (6), the heat exchanger (7), the sixth temperature sensor (25) and the temperature control circulating pump (28) are connected through pipelines to form a group of circulating loops, low-temperature liquid in the cold storage water tank (3) is subjected to variable frequency regulation to enter cold fluid flow of the heat exchanger (7) through the temperature control circulating pump (28), the cold fluid flow is further regulated through bypass of the second electric two-way regulating valve (26), heat exchange is carried out on the cold fluid and liquid returned in the liquid supply unit C, and the first temperature sensor (6) and the sixth temperature sensor (25) are respectively arranged at a liquid outlet and a liquid inlet of the heat exchanger (7) in the circulating loops; The heat exchanger (7), the second temperature sensor (8), the buffer water tank (9), the electric three-way regulating valve (21), the flow sensor (23) and the fifth temperature sensor (24) are connected through pipelines, and form another group of circulating loops with the liquid supply unit C, cooling liquid after cooling the load (15) is shunted through the electric three-way regulating valve (21), one path of cooling liquid directly flows back to the buffer water tank (9), the other path of cooling liquid exchanges heat with low-temperature liquid in the heat exchanger (7) and then flows back to the buffer water tank (9), and the second temperature sensor (8) and the fifth temperature sensor (24) are respectively arranged at a liquid outlet and a liquid inlet of the heat exchanger (7) in the other group of circulating loops; a flow sensor is arranged on a pipeline of the temperature control unit B; the liquid supply unit C comprises a buffer water tank (9), a load (15), a first electric two-way regulating valve (17) and an electric three-way regulating valve (21); The high-load constant-temperature liquid supply cooling device takes a heat exchanger (7) as a tie, and according to feedback of a first temperature sensor (6), a sixth temperature sensor (25), a second temperature sensor (8), a fifth temperature sensor (24) and a flow sensor in a liquid supply and return pipeline, the opening of a temperature control circulating pump (28) frequency and a second electric two-way regulating valve (26) and an electric three-way regulating valve (21) in a temperature control unit B are regulated, then the flow of cold and hot fluid entering the heat exchanger (7) is regulated to perform heat exchange, finally the liquid in a buffer water tank (9) is always maintained within a set temperature range, a good temperature control effect is achieved, and continuous and reliable constant-temperature cooling liquid can be provided for load (15) equipment.
2. 2. The high-load constant-temperature liquid supply cooling device of claim 1, wherein the liquid supply unit C further comprises a standby small pump (12), an electric heating unit (16), a first liquid supply pump (18) and a second liquid supply pump (19), and the buffer water tank (9), the standby small pump (12), the load (15), the electric heating unit (16), the first electric two-way regulating valve (17), the first liquid supply pump (18), the second liquid supply pump (19), the electric three-way regulating valve (21) and the flow sensor (23) are connected through pipelines to form a circulation loop.
3. 3. The high-load constant-temperature liquid cooling device of claim 2, wherein the standby small pump (12), the first liquid supply pump (18), the second liquid supply pump (19) and the temperature control circulating pump (28) are all variable-frequency pumps.
4. 4. The device of claim 1, wherein the cold storage unit A, the temperature control unit B and the liquid supply unit C comprise multiple sets of throttle devices.
5. 5. The high-load constant-temperature liquid supply cooling device according to claim 1, wherein the cold accumulation water tank (3) and the buffer water tank (9) are respectively provided with a temperature sensor and a liquid level meter.
6. 6. The device for cooling a large-load constant temperature supply liquid according to claim 1, wherein the first electric two-way regulating valve (17), the electric three-way regulating valve (21) and the second electric two-way regulating valve (26) are proportional regulating type electric valves.
7. 7. The device for cooling a large-load constant temperature liquid according to claim 1, wherein pressure gauges are installed on liquid supply pipelines of the cold accumulation unit A, the temperature control unit B and the liquid supply unit C.
8. 8. The method for controlling temperature of a high-load constant temperature liquid supply cooling device according to any one of claims 1 to 7, comprising the steps of: The method comprises the following steps that 1, a refrigerating host machine (1) in a cold accumulation unit A enables liquid in a cold accumulation water tank (3) to maintain stable low temperature, the temperature of the liquid is set and adjusted independently, a temperature sensor and a liquid level meter are arranged in the cold accumulation water tank (3), and cold energy stored by a temperature and liquid level calculation system is calculated; the method comprises the steps of 2, providing constant-temperature and variable-flow cooling liquid for a load (15) by a buffer water tank (9) in a liquid supply unit C, wherein for a thermal load with small heat flux density, low-flow liquid supply is carried out by means of bypass adjustment of a standby small pump (12) and a first electric two-way regulating valve (17), and for a thermal load with large heat flux density, the start-stop and the frequency of a first liquid supply pump (18) and a second liquid supply pump (19) are automatically judged by comparing the set flow and the total flow of the liquid return; Step3, controlling the opening degree of an electric three-way regulating valve (21) according to feedback of a temperature sensor in a buffer water tank (9), a flow sensor (23) on a liquid level meter and a pipeline and a fifth temperature sensor (24), so as to regulate the flow of a hot end entering a heat exchanger (7), namely, the cooling liquid cooled by a load (15) is shunted by the electric three-way regulating valve (21), one path directly flows back to the buffer water tank (9), and the other path flows back to the buffer water tank (9) after heat exchange with the low-temperature liquid in the heat exchanger (7); Step 4, the low-temperature liquid in the cold accumulation water tank (3) in the temperature control unit B is subjected to variable frequency regulation to enter the cold fluid flow of the heat exchanger (7) through the temperature control circulating pump (28), and the bypass flow is further regulated through the second electric two-way regulating valve (26), and then is subjected to heat exchange with the return liquid in the liquid supply unit C; Step 5, an electric three-way regulating valve (21) in the temperature control unit B regulates the flow of the liquid return into the heat exchanger (7) according to feedback of a fifth temperature sensor (24), a second temperature sensor (8) and a flow sensor (23) on a pipeline, and performs heat exchange with low-temperature liquid in the cold storage unit A, so that the temperature of the cooling liquid in the buffer water tank (9) is maintained stable; Step 6, the electric heating (16) carries out thermal compensation on the return liquid according to feedback of a temperature sensor in the buffer water tank (9) and a third temperature sensor (14) on a pipeline, and further ensures that the temperature of the cooling liquid in the buffer water tank (9) is stable; and 7, forming a plurality of circulation loops in the cold accumulation unit A, the temperature control unit B and the liquid supply unit C.

Description

Large-load constant-temperature liquid supply cooling device and temperature control method Technical Field The invention relates to the field of liquid cooling systems, in particular to a high-load constant-temperature liquid supply cooling device and a temperature control method. Background With the rapid increase of volume power of electronic equipment, the spatial integration level of components is more and more complex, the heat flux density is also continuously increased, and then the heat dissipation requirements of the long-time continuous heating elements and equipment are more and more urgent. The traditional natural cooling or forced air cooling mode has obvious effect only on equipment with smaller heat flux or fewer heating sources, and the air cooling mode often cannot meet the expected heat dissipation requirement on large-load equipment with excessive heating sources and scattered positions. The liquid circulation cooling technology gradually becomes the first choice for cooling the integrated electronic equipment with large load due to the advantages of higher heat exchange coefficient, stable working capacity, low noise and the like. The liquid circulation cooling technology can continuously provide cooling liquid with certain temperature, flow and pressure for the heat load, continuously cool the part of the heat load, and create stable and good working environment for the whole integrated system, so that the integrated system can continuously work. The key content of the technology is coordination and control among cold accumulation, temperature control and liquid supply so as to achieve the highest efficient heat dissipation requirement. Disclosure of Invention In order to overcome the defect that the traditional air cooling has insufficient heat dissipation capacity for multi-heat source and high heat flux equipment, and the phenomenon that the existing conventional liquid cooling system is unstable in cooling temperature control for large-scale load equipment, the invention can meet the cooling requirement of continuous constant-temperature liquid supply for the large-scale load equipment by providing a new temperature control strategy and constant-temperature liquid supply device design. In order to achieve the above purpose, the invention adopts the following technical scheme: A large-load constant-temperature liquid supply cooling device comprises a cold accumulation unit, a temperature control unit and a liquid supply unit which are mutually independent and cooperatively act; the cold accumulation unit A comprises a refrigeration host, a cold accumulation water tank and a cold accumulation circulating pump which form a circulating loop through pipelines; the temperature control unit comprises a heat exchanger, a buffer water tank, a second electric two-way regulating valve, a temperature control circulating pump and an electric three-way regulating valve; The liquid supply unit comprises a buffer water tank, a load, a first electric two-way regulating valve and an electric three-way regulating valve; the temperature control unit and the liquid supply unit are respectively provided with a plurality of temperature sensors, and the temperature control unit is provided with a flow sensor; The high-load constant-temperature liquid supply cooling device takes a heat exchanger as a tie, adjusts the frequency of a temperature control circulating pump in a temperature control unit and the opening of a second electric two-way regulating valve and an electric three-way regulating valve according to feedback of each temperature sensor and each flow sensor in a liquid supply and return pipeline, then adjusts the flow of cold and hot fluid entering the heat exchanger to perform heat exchange, finally enables the liquid in a buffer water tank to be always maintained within a set temperature range, achieves a good temperature control effect, and can further provide constant-temperature cooling liquid for load equipment continuously and reliably. As preferable of the above scheme, the temperature control unit uses a heat exchanger as a core to form two groups of circulation loops; the cold accumulation water tank, the heat exchanger, the second electric two-way regulating valve and the temperature control circulating pump are connected through pipelines to form a group of circulating loops; the heat exchanger, the buffer water tank, the electric three-way regulating valve and the flow sensor are connected through pipelines to form another group of loops. The liquid supply unit also comprises a standby small pump, an electric heating device, a first liquid supply pump and a second liquid supply pump, wherein the buffer water tank, the standby small pump, the load, the electric heating device, the first electric two-way regulating valve, the first liquid supply pump, the second liquid supply pump, the electric three-way regulating valve and the flow sensor are connected through pipelines to form a c