A closed integrated liquid cooling system for a power unit

Abstract

The present invention discloses a closed integrated liquid cooling and heat dissipation system for a power unit, which belongs to the field of cooling of military high-power electric equipment, and includes a circulating water pump, an air-liquid heat exchanger, a cooling fan, a self-pressurizing water tank, a safety valve, a controller and a temperature and pressure sensor; a self-pressurizing water tank is used to replace the original expansion water tank, and the design of the flow channel inside the shell is adopted, with the air-liquid heat exchanger as the structural carrier, and other equipment such as the cooling fan and the circulating water pump are integrated on the air-liquid heat exchanger. The present invention solves the problems of low heat exchange efficiency and low space utilization of the open liquid cooling system, and can improve the adaptability, stability and reliability of the liquid cooling and heat dissipation system of the power unit in wartime.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling military high-power electric equipment, and more specifically, to a closed integrated liquid cooling and heat dissipation system for a power unit. Background Art

[0002] The power unit is a high-power energy conversion equipment for military use, with a rated output power of not less than 280kW. The engine, generator, generator controller and other components with high heat consumption are equipped with a liquid cooling system. The current liquid cooling system adopts an open liquid cooling system. There is a pressure regulating valve in the expansion water tank of the system. When the pressure regulating valve is opened, the system is connected to the external environment, and air is mixed into the coolant. In wartime, the air quality is poor, which will contaminate the coolant and there is a risk of blockage in the heat exchanger flow channel, resulting in reduced heat exchange efficiency of the coolant. The coolant is corrosive to a certain extent. Long-term contact with air will accelerate the deterioration of the coolant under the influence of high temperature environment. In addition, the coolant mixed with air will cause great damage to the water pump of the power component of the liquid cooling system.

[0003] The radiator, water pump, expansion tank and other components are connected by rubber tubes, the system loses part of the pipeline flow resistance, and the components are not arranged in a centralized manner, and the space utilization rate is not high. Therefore, in order to improve the current situation, it is necessary to develop a closed integrated liquid cooling system. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a closed integrated liquid cooling and heat dissipation system for a power unit, which solves the problems of low heat exchange efficiency and low space utilization of an open liquid cooling system.

[0005] The object of the present invention is achieved through the following solutions:

[0006] A closed integrated liquid cooling and heat dissipation system for a power unit comprises a circulating water pump, an air-liquid heat exchanger, a cooling fan, a self-pressurizing water tank, a safety valve, a controller and a temperature and pressure sensor; a self-pressurizing water tank is installed at the bottom of the air-liquid heat exchanger, a housing at the bottom of the air-liquid heat exchanger is provided with a mounting interface of the self-pressurizing water tank, a mounting flange surface of the self-pressurizing water tank is connected to the bottom interface of the air-liquid heat exchanger and then fixed with screws; a mounting position of a circulating water pump is provided on the housing at the coolant outlet of the air-liquid heat exchanger, an inlet of the circulating water pump is connected to an outlet of the air-liquid heat exchanger, and a temperature and pressure sensor is provided. The coolant coming out of the air-liquid heat exchanger directly enters the inlet of the circulating water pump, and the coolant output by the circulating water pump enters the heat load device, takes away the heat load and enters the coolant inlet of the air-liquid heat exchanger. In the air-liquid heat exchanger, the heat radiating fins and the liquid exchange heat, and the cooling fan accelerates the air flow around the heat radiating fins, thereby dissipating the heat on the heat radiating fins and finally discharging the heat load. Temperature and pressure sensors are arranged at the coolant inlet of the air-liquid heat exchanger and the outlet of the circulating water pump. The temperature and pressure sensors, the cooling fan and the circulating water pump are all connected to the controller.

[0007] Furthermore, the structure of the self-increasing water tank is a cylindrical cup, with a diaphragm box installed inside, and the diaphragm box is pre-filled with gas of a certain pressure to realize pressurization of the coolant in the water tank.

[0008] Furthermore, a rubber ring groove is provided on the flange mounting surface of the self-pressurized water tank and is connected to the liquid side of the air-liquid heat exchanger.

[0009] Furthermore, the volume of the coolant in the self-pressurized water tank is designed or selected according to 1.5 times the change in the volume of the coolant.

[0010] Furthermore, a first temperature and pressure sensor is provided at the coolant inlet of the air-liquid heat exchanger. When the temperature or the temperature difference reaches a set value, the controller controls the cooling fan to start working, and the temperature difference is used to adjust the number of revolutions of the cooling fan.

[0011] Furthermore, a second temperature and pressure sensor is arranged at the outlet of the circulating water pump. The pressure signal provided by the second temperature and pressure sensor is used to monitor whether the coolant of the closed liquid cooling system is in normal operation. If the pressure value is abnormal, the operation is stopped; if the pressure value is normal, the operation continues.

[0012] Furthermore, the temperature and pressure signals collected by the temperature and pressure sensor monitor the state of the coolant in the liquid cooling system in real time. According to the state feedback of the coolant, the controller adjusts the start and operation of the cooling fan and the circulating water pump, thereby ensuring that the closed integrated liquid cooling system is in a stable state.

[0013] Furthermore, the safety valve is installed at the highest point on the liquid side of the air-liquid heat exchanger.

[0014] Furthermore, the opening pressure value of the safety valve is set to the withstand pressure value in the system circuit. When the pressure in the system exceeds the set value during operation, a part of the pressure is released to ensure the safety of the system.

[0015] Furthermore, the safety valve is provided with an air release valve button for removing residual air mixed in the system.

[0016] The beneficial effects of the present invention include:

[0017] The present invention adopts a self-pressurized water tank to replace the original expansion water tank, which effectively avoids the risk of failure of the pressure regulating valve on the expansion water tank and physically avoids the contact between the coolant and the external environment; the design of the internal flow channel of the shell is adopted, and the air-liquid heat exchanger is used as the structural carrier. The cooling fan, circulating water pump and other equipment are integrated on the air-liquid heat exchanger, which reduces the connecting pipelines and reduces the risk of pipeline loss and leakage, effectively integrates various components, improves heat exchange efficiency, and effectively solves the problems in the background technology.

[0018] The present invention can improve the adaptability, stability and reliability of the liquid cooling system of the power unit in a wartime state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a functional block diagram of a closed integrated liquid cooling system;

[0021] Figure 2 It is a schematic diagram of the structure of a closed integrated liquid cooling system;

[0022] Figure 3 It is a schematic diagram of the structure of a closed integrated liquid cooling system;

[0023] Figure 4 It is a schematic diagram of the structure of the self-pressurized water tank;

[0024] Figure 5 This is a schematic diagram of the safety valve (air release valve) structure;

[0025] In the figure, 1-air-liquid heat exchanger, 2-air-liquid heat exchanger core, 3-safety valve, 4-liquid side inlet of air-liquid heat exchanger, 51-first temperature and pressure sensor, 52-second temperature and pressure sensor, 6-self-pressurized water tank, 7-circulating water pump, 8-liquid side outlet of air-liquid heat exchanger, 9-drain valve, 10-cooling fan controller, 11-cooling fan, 12-self-pressurized water tank shell, 13-diaphragm box, 14-inflating one-way valve, 15-deflation valve button. DETAILED DESCRIPTION

[0026] The invention is further described below in conjunction with the accompanying drawings and embodiments. All features disclosed in all embodiments in this specification, or steps in all methods or processes disclosed implicitly, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0027] In a specific embodiment, the closed integrated liquid cooling system includes a power element circulating water pump 7, an air-liquid heat exchanger 1, a cooling fan 11, a self-pressurizing water tank 6, a safety valve 3 and a temperature and pressure sensor. The air-liquid heat exchanger 1 includes an air-liquid heat exchanger core 2, and a drain valve 9 is arranged under the air-liquid heat exchanger core 2. The self-pressurizing water tank 6 includes a self-pressurizing water tank shell 12 and an inflation one-way valve 14.

[0028] A self-pressurizing water tank 6 is installed at the bottom of the air-liquid heat exchanger 1. The structure of the self-pressurizing water tank 6 is a cylindrical cup shape, and a diaphragm box 13 is installed inside. The diaphragm box 13 is pre-filled with a certain pressure of gas to pressurize the coolant in the water tank, so as to ensure that the inlet pressure of the circulating water pump is positive under different working conditions (especially low temperature and high altitude areas) to avoid cavitation of the circulating water pump. The installation interface of the self-pressurizing water tank 6 is set on the shell at the bottom of the air-liquid heat exchanger 1. The installation flange surface of the self-pressurizing water tank 6 is connected to the bottom interface of the air-liquid heat exchanger 1 and fixed with 4 screws. A rubber ring groove is set on the flange installation surface of the self-pressurizing water tank 6, which is connected to the liquid side of the air-liquid heat exchanger 1. The volume of the coolant in the self-pressurizing water tank 6 is designed or selected according to 1.5 times the volume change of the coolant (caused by temperature change).

[0029] An installation position of a circulating water pump 7 is set on the shell at the coolant outlet of the air-liquid heat exchanger 1, and the inlet of the circulating water pump 7 is connected with the outlet of the air-liquid heat exchanger 1. The coolant out of the air-liquid heat exchanger 1 directly enters the inlet of the circulating water pump 7, and the coolant output by the circulating water pump 7 enters the heat load device, and enters the coolant inlet of the air-liquid heat exchanger 1 after taking away the heat load. In the air-liquid heat exchanger 1, the heat radiating fins and the liquid exchange heat, and the cooling fan 11 accelerates the air flow near the heat radiating fins, so as to dissipate the heat on the heat radiating fins and finally discharge the heat load.

[0030] Temperature and pressure sensors are provided at the coolant inlet of the air-liquid heat exchanger 1 and the outlet of the circulating water pump 7 (wherein a first temperature and pressure sensor 51 is provided at the coolant inlet of the air-liquid heat exchanger 1, and a second temperature and pressure sensor 52 is provided at the outlet of the circulating water pump 7). When the temperature or temperature difference reaches a set value, the cooling fan 11 starts to work. The temperature difference can be used to adjust the number of revolutions of the cooling fan, thereby achieving precise temperature control so that it works within a normal temperature range. When the temperature exceeds the set value, all fans work at full speed. The air volume required for heat exchange should be appropriately increased during design to avoid overheating phase change of the coolant. The pressure signal provided by the temperature and pressure sensor at the outlet of the circulating water pump 7 is used to monitor whether the coolant of the closed liquid cooling system is in normal operation. If the pressure value is abnormal, the product should stop working to avoid irreversible damage to the equipment caused by heat concentration.

[0031] The temperature and pressure sensors, cooling fan 11 and circulating water pump 7 are all connected to the controller. The temperature and pressure signals monitor the state of the coolant in the liquid cooling system in real time. According to the feedback of the coolant state, the controller adjusts the start and operation of the cooling fan 11 and the circulating water pump 7, thereby ensuring that the closed integrated liquid cooling system is in a stable state.

[0032] The safety valve 3 is installed at the highest point of the liquid side of the air-liquid heat exchanger 1. The opening pressure value of the safety valve 3 is set to the withstand pressure value in the system circuit. When the pressure in the system exceeds the set value during operation, a part of the pressure is released to ensure the safety of the system.

[0033] The air release valve button 15 in the safety valve 3 can be used to remove the residual air mixed in the system.

[0034] according to Figure 1 System functional block diagram, where U represents the power supply voltage, I represents the current, and p 液 Indicates the circulating water pump output pressure, q 液 represents the output flow of the circulating water pump, Q represents the heat load, and p 气 Indicates the heat exchanger inlet air pressure, q 气 Indicates the air flow rate at the heat exchanger inlet. The air-liquid heat exchanger liquid side inlet 4 and the air-liquid heat exchanger liquid side outlet 8 of the closed integrated liquid cooling and heat dissipation system of the embodiment of the present invention are respectively connected with the pipelines of the heat load equipment. After the connection is completed, prepare for the air tightness test. Use vacuum liquid pumping equipment to inject a certain amount of coolant from the liquid injection valve into the closed integrated liquid cooling and heat dissipation system of the embodiment of the present invention, so that the pressure signal of the first temperature and pressure sensor 51 at the air-liquid heat exchanger liquid side inlet 4 is 0.2Mpa (absolute pressure). After the pressure stabilizes, maintain the pressure for half an hour. If the pressure is stable, the air tightness meets the requirements.

[0035] Then use the vacuum extraction equipment to extract all the coolant in the system loop, and then continue to extract. When the pressure signal is below 0.005Mpa (absolute pressure), stop vacuuming, and then inject coolant into the closed integrated liquid cooling system of the embodiment of the present invention, read the temperature signal of the second temperature and pressure sensor 52 at the circulating water pump 7, and then determine the pressure value of the injected coolant according to the temperature value. After the coolant pressure reaches this value, stop injecting and separate the vacuum extraction and injection equipment from the injection valve.

[0036] Put the circulating water pump 7 into operation, intermittently press the vent valve button 15 of the safety valve 3 to discharge the remaining gas in the closed integrated liquid cooling and heat dissipation system of the embodiment of the present invention, then release it to stop the circulating water pump 7. When the coolant temperature is 25°C, inject a certain amount of coolant into the system to make the coolant pressure 0.156Mpa. At this point, the closed integrated liquid cooling and heat dissipation system of the embodiment of the present invention completes the liquid injection operation and can participate in the heat dissipation work of the system.

[0037] When the temperature signal of the temperature and pressure sensor of the closed integrated liquid cooling and heat dissipation system of the embodiment of the present invention reaches a set value, the circulating water pump 7 starts to continuously output coolant to the heat load equipment. After the coolant absorbs the heat load, the temperature rises, and the heated coolant enters the air-liquid heat exchanger 1. The material of the air-liquid heat exchanger 1 is aluminum alloy. Most of the heat load is transferred to the heat dissipation fins of the air-liquid heat exchanger 1, and then heat is exchanged with the air. When the temperature rises to a certain set value, the cooling fan 11 starts to accelerate the air flow on the surface of the heat dissipation fins. If the temperature rises to a limited value, the cooling fan 11 runs at full speed to dissipate the heat and ensure stable operation of the system.

[0038] The self-pressurizing water tank 6 in the embodiment of the present invention is a self-pressurizing water tank developed based on the compressible property of gas, and is composed of a coolant portion and a gas portion of a metal bellows, and the gas and the liquid are physically isolated. When the temperature of the environment increases and the volume of the coolant increases, the gas in the metal bellows is compressed, providing space for the volume of the coolant to increase.

[0039] Example 1

[0040] A closed integrated liquid cooling and heat dissipation system for a power unit, comprising a circulating water pump 7, an air-liquid heat exchanger 1, a cooling fan 11, a self-pressurizing water tank 6, a safety valve 3, a controller and a temperature and pressure sensor; a self-pressurizing water tank 6 is installed at the bottom of the air-liquid heat exchanger 1, a mounting interface of the self-pressurizing water tank 6 is provided on the shell at the bottom of the air-liquid heat exchanger 1, and the mounting flange surface of the self-pressurizing water tank 6 is fixed with screws after docking with the bottom interface of the air-liquid heat exchanger 1; an installation position of the circulating water pump 7 is provided on the shell at the coolant outlet of the air-liquid heat exchanger 1, and the inlet of the circulating water pump 7 is connected to the outlet of the air-liquid heat exchanger 1 The coolant coming out of the air-liquid heat exchanger 1 directly enters the inlet of the circulating water pump 7, and the coolant output by the circulating water pump 7 enters the heat load device, takes away the heat load and enters the coolant inlet of the air-liquid heat exchanger 1, in the air-liquid heat exchanger 1, the heat exchange between the radiating fins and the liquid is performed, and the cooling fan 11 accelerates the air flow around the radiating fins, thereby dissipating the heat on the radiating fins, and finally discharges the heat load; temperature and pressure sensors are arranged at the coolant inlet of the air-liquid heat exchanger 1 and the outlet of the circulating water pump 7; the temperature and pressure sensor, the cooling fan 11 and the circulating water pump 7 are all connected to the controller.

[0041] Example 2

[0042] On the basis of Example 1, the structure of the self-increasing water tank 6 is a cylindrical cup shape, with a diaphragm box 13 installed inside, and the diaphragm box 13 is pre-filled with gas of a certain pressure to realize pressurization of the coolant in the water tank.

[0043] Example 3

[0044] On the basis of Example 1, a rubber ring groove is provided on the flange mounting surface of the self-pressurizing water tank 6 , which is connected to the liquid side of the air-liquid heat exchanger 1 .

[0045] Example 4

[0046] On the basis of Example 1, the volume of the coolant in the self-pressurizing water tank 6 is designed or selected according to 1.5 times the change in the volume of the coolant.

[0047] Example 5

[0048] On the basis of Example 1, a first temperature and pressure sensor 51 is provided at the coolant inlet of the air-liquid heat exchanger 1. When the temperature or temperature difference reaches a set value, the controller controls the cooling fan 11 to start working. The temperature difference is used to adjust the speed of the cooling fan 11.

[0049] Example 6

[0050] On the basis of Example 1, a second temperature and pressure sensor 52 is arranged at the outlet of the circulating water pump 7. The pressure signal provided by the second temperature and pressure sensor 52 is used to monitor whether the coolant of the closed liquid cooling system is in normal operation. If the pressure value is abnormal, the operation is stopped; if the pressure value is normal, the operation continues.

[0051] Example 7

[0052] On the basis of Example 1, the temperature and pressure signals collected by the temperature and pressure sensor are used to monitor the state of the coolant in the liquid cooling system in real time. According to the feedback of the state of the coolant, the controller adjusts the start and operation of the cooling fan 11 and the circulating water pump 7, thereby ensuring that the closed integrated liquid cooling system is in a stable state.

[0053] Example 8

[0054] On the basis of Example 1, the safety valve 3 is installed at the highest point on the liquid side of the air-liquid heat exchanger 1 .

[0055] Example 9

[0056] On the basis of Example 1, the opening pressure value of the safety valve 3 is set to the withstand pressure value in the system circuit. When the pressure in the system exceeds the set value during operation, part of the pressure is released to ensure the safety of the system.

[0057] Example 10

[0058] On the basis of Example 1, the safety valve 3 is provided with an air release valve button for removing residual air mixed in the system.

[0059] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

[0060] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific implementation mode of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

[0061] In addition to the above examples, those skilled in the art may obtain other embodiments based on the above disclosure or by using the knowledge or technology in the relevant field to make changes. The features of each embodiment may be interchangeable or replaced. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A closed integrated liquid cooling system for a power unit, characterized in that: The invention comprises a circulating water pump (7), an air-liquid heat exchanger (1), a cooling fan (11), a self-pressurizing water tank (6), a safety valve (3), a controller and a temperature and pressure sensor; the self-pressurizing water tank (6) is installed at the bottom of the air-liquid heat exchanger (1); a mounting interface of the self-pressurizing water tank (6) is provided on the shell at the bottom of the air-liquid heat exchanger (1); the mounting flange surface of the self-pressurizing water tank (6) is connected to the bottom interface of the air-liquid heat exchanger (1) and fixed with screws; a circulating water pump (7) is provided on the shell at the coolant outlet of the air-liquid heat exchanger (1); ) is installed at an installation position, the inlet of the circulating water pump (7) is connected to the outlet of the air-liquid heat exchanger (1), the coolant discharged from the air-liquid heat exchanger (1) directly enters the inlet of the circulating water pump (7), the coolant output by the circulating water pump (7) enters the heat load device, takes away the heat load and enters the coolant inlet of the air-liquid heat exchanger (1), the heat dissipation fins and the liquid in the air-liquid heat exchanger (1) perform heat exchange, the cooling fan (11) accelerates the air flow around the heat dissipation fins, thereby dissipating the heat on the heat dissipation fins, and finally discharges the heat load; Temperature and pressure sensors are provided at the coolant inlet of the air-liquid heat exchanger (1) and the outlet of the circulating water pump (7); the temperature and pressure sensors, the cooling fan (11) and the circulating water pump (7) are all connected to a controller; The self-pressurizing water tank (6) is in the form of a cylindrical cup, with a diaphragm box (13) installed inside. The diaphragm box (13) is pre-filled with gas of a certain pressure to pressurize the coolant in the water tank.

2. The closed integrated liquid cooling and heat dissipation system of the power unit according to claim 1 is characterized in that: A rubber ring groove is provided on the flange mounting surface of the self-pressurizing water tank (6) and is connected to the liquid side of the air-liquid heat exchanger (1).

3. The closed integrated liquid cooling and heat dissipation system of the power unit according to claim 1 is characterized in that: The volume of the coolant in the self-pressurizing water tank (6) is designed or selected based on 1.5 times the change in the volume of the coolant.

4. The closed integrated liquid cooling and heat dissipation system for the power unit according to claim 1 is characterized in that: A first temperature and pressure sensor (51) is provided at the coolant inlet of the air-liquid heat exchanger (1); when the temperature or the temperature difference reaches a set value, the controller controls the cooling fan (11) to start working; the temperature difference is used to adjust the number of revolutions of the cooling fan (11).

5. The closed integrated liquid cooling and heat dissipation system of the power unit according to claim 1 is characterized in that: A second temperature and pressure sensor (52) is provided at the outlet of the circulating water pump (7). The pressure signal provided by the second temperature and pressure sensor (52) is used to monitor whether the coolant of the closed liquid cooling system is in normal operation. If the pressure value is abnormal, the system stops working; if the pressure value is normal, the system continues to operate.

6. The closed integrated liquid cooling and heat dissipation system for the power unit according to claim 1 is characterized in that: The temperature and pressure signals collected by the temperature and pressure sensor are used to monitor the state of the coolant in the liquid cooling and heat dissipation system in real time. Based on the feedback of the state of the coolant, the controller adjusts the start-up and operation of the cooling fan (11) and the circulating water pump (7), thereby ensuring that the closed integrated liquid cooling and heat dissipation system is in a stable state.

7. The closed integrated liquid cooling and heat dissipation system for the power unit according to claim 1 is characterized in that: The safety valve (3) is installed at the highest point on the liquid side of the air-liquid heat exchanger (1).

8. The closed integrated liquid cooling and heat dissipation system for a power unit according to claim 1, characterized in that: The opening pressure value of the safety valve (3) is set to the withstand pressure value in the system circuit. When the pressure in the system exceeds the set value during operation, a portion of the pressure is released to ensure the safety of the system.

9. The closed integrated liquid cooling and heat dissipation system for the power unit according to claim 1, characterized in that: The safety valve (3) is provided with an air release valve button for removing residual air mixed in the system.

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