Airborne liquid cooling system

Abstract

The utility model relates to an airborne liquid cooling system, and discloses an airborne liquid cooling system which comprises a condensate liquid return port and a condensate liquid output port which are connected to airborne equipment, a cooling liquid return pipe is connected between the condensate liquid return port and an evaporator, and a cooling liquid output pipe is connected between the condensate liquid output port and the evaporator. A cooling coil arranged at the condenser is connected between the cooling liquid return pipe and the cooling liquid output pipe, and the cooling liquid return pipe, the liquid inlet end of the cooling coil and the liquid inlet end of the evaporator are connected through an electric three-way valve. According to the utility model, under the condition that the ram air at the condensation side cannot be adjusted, the liquid cooling system is utilized to absorb the heating load of the equipment, and the heat dissipation of the condensation side is adjusted, so that the influence of the flight height and speed on the heat dissipation effect of the ram air at the condensation side is balanced to a certain extent; the attenuation of the cooling capacity of the evaporation side is reduced as much as possible, and the temperature control precision is maintained.

Description

Technical Field

[0001] The utility model relates to an airborne liquid cooling system, in particular to an airborne liquid cooling system. Background Art

[0002] The airborne liquid cooling system mainly includes two types of refrigeration forms, evaporative cycle refrigeration system and air cycle refrigeration system.

[0003] Among them, the airborne liquid cooling system of the evaporative cycle refrigeration system has a condenser that dissipates heat to heat sinks such as ram air or fuel. Aircraft equipped with airborne liquid cooling systems using evaporative cycle refrigeration systems have characteristics such as large flight altitude spans and large flight speed changes due to mission and usage requirements. Correspondingly, liquid cooling systems that use ram air as a condensation heat exchange method will be adversely affected.

[0004] Specifically, the temperature and density of the atmosphere vary significantly with altitude. The temperature and density of the ram air are high when flying at low altitudes, and low when flying at high altitudes, which has a great impact on the heat dissipation effect on the condensation side, and thus affects the cooling capacity on the evaporation side. The airborne liquid cooling system usually provides cooling for equipment such as airborne radars. The heat load of the equipment to be cooled does not change with altitude, or changes only slightly, and has high temperature control accuracy requirements.

[0005] In addition, changes in flight speed also affect the amount of ram air, the surface temperature of the aircraft skin, etc., which have a direct or indirect impact on the operation of the condenser that uses ram air for heat dissipation.

[0006] Therefore, in the field of airborne liquid cooling systems using evaporative cycle refrigeration systems, there is an urgent need to study an airborne liquid cooling system that can solve the above problems under conditions of changing atmospheric temperature (altitude) and flight speed.

[0007] The existing airborne liquid cooling system uses ram air as the heat dissipation form on the condensation side. It works normally under low-altitude flight conditions without adjusting the condensation pressure. When flying at high altitudes, the exhaust valve or adjustable damper installed on the ram air pipeline of the condenser can be used to adjust the air flow to maintain the condensation temperature. This can achieve adjustable condensation heat dissipation, but the cost is a complex structure and increased aircraft performance compensation loss.

[0008] In addition, airborne liquid cooling systems are mostly retrofitted equipment, and not all airborne platforms (aircraft) allow the installation of exhaust valves or adjustable dampers.

[0009] Under the condition that the ram air cannot be adjusted, in order to cope with the low temperature startup work, the refrigeration system of the liquid cooling system can use a condensing pressure regulating valve. After starting up when the atmospheric temperature is low, the high-pressure regulating valve of the condensing pressure regulating valve is in a closed state until the refrigerant discharged by the compressor accumulates in the condenser. When liquid accumulates, the heat transfer area of ​​the condenser decreases and the condensing pressure gradually increases.

[0010] However, when the atmospheric temperature at high altitude is too low, the heat dissipation load of the equipment in the airborne platform may still be at the standard value or even the peak value, and measures need to be taken. Usually, the output capacity of the standard working condition of the refrigeration system is increased in consideration of the low temperature working condition, which results in an increase in size, weight, and energy consumption, and thus increases the compensation loss of aircraft performance. Utility Model Content

[0011] The utility model aims at the problems existing in the airborne liquid cooling system in the prior art and provides an airborne liquid cooling system and a control method thereof.

[0012] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0013] An airborne liquid cooling system comprises a condensate return port and a condensate output port connected to an airborne device, an evaporative cycle refrigeration circuit is connected between the condensate return port and the condensate output port, the evaporative cycle refrigeration circuit comprises an evaporator, the condensate return port is connected to an inlet of the evaporator, and the condensate output port is connected to an outlet of the evaporator;

[0014] A coolant return pipe is connected between the condensate return port and the evaporator, a coolant output pipe is connected between the condensate output port and the evaporator, a heat dissipation coil arranged at the condenser is connected between the coolant return pipe and the coolant output pipe, and the coolant return pipe, the liquid inlet end of the heat dissipation coil and the liquid inlet end of the evaporator are connected by an electric three-way valve.

[0015] Preferably, the evaporative cycle refrigeration circuit includes a condenser, the condenser includes a condenser shell and a condenser coil arranged in the condenser shell, and the heat dissipation coil is arranged in the condenser shell.

[0016] Preferably, the inlet and outlet of the evaporator are respectively connected to an evaporator liquid inlet pipe and an evaporator liquid outlet pipe, the evaporator liquid inlet pipe is connected to the coolant return pipe, and the evaporator liquid outlet pipe is connected to the coolant output pipe.

[0017] The heat dissipation coil is connected with a coil liquid inlet pipe and a coil liquid outlet pipe, and an electric three-way valve is arranged between the coil liquid inlet pipe, the evaporator liquid inlet pipe and the coolant return pipe.

[0018] Preferably, a return end liquid connector, a water tank and a water pump are provided on the coolant return pipe in sequence from the condensate return port, and an output end liquid connector and a filter are provided on the coolant output pipe in sequence from the condensate output port.

[0019] Preferably, a safety valve and an automatic exhaust valve are installed on the water tank, and a drain valve is also connected to the water tank.

[0020] Preferably, both the coil liquid outlet pipe and the evaporator liquid outlet pipe are provided with a check valve that enables the condensate to flow toward the condensate outlet.

[0021] Preferably, the evaporative cycle refrigeration circuit includes an expansion valve, and the inlet and outlet of the condenser coil are respectively provided with a condenser liquid inlet pipe and a condenser liquid outlet pipe, a differential pressure regulating valve is connected between the condenser liquid inlet pipe and the condenser liquid outlet pipe, and a high-pressure regulating valve and a liquid storage tank are connected in sequence from the condenser end between the condenser liquid outlet pipe and the expansion valve.

[0022] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0023] The utility model can, under the condition that the ram air on the condensation side cannot be adjusted, utilize the liquid cooling system to absorb the heat load of the equipment and adjust the heat dissipation on the condensation side, thereby balancing the influence of the flight altitude and speed on the heat dissipation effect of the ram air on the condensation side to a certain extent, reducing the attenuation of the cooling capacity of the evaporation side as much as possible and maintaining the temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the airborne liquid cooling system in Example 1 of the utility model.

[0025] Figure 2 This is a control flow chart of the airborne liquid cooling system in Example 1 of the utility model. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Example 1

[0028] An airborne liquid cooling system comprises a condensate return port 1 and a condensate output port 2 connected to an airborne device, an evaporative cycle refrigeration circuit is connected between the condensate return port 1 and the condensate output port 2, the evaporative cycle refrigeration circuit comprises an evaporator 3, a compressor 4, a condenser 5 and an expansion valve 6 which are sequentially connected and constitute a circuit, the condensate return port 1 is connected to an inlet of the evaporator 3, and the condensate output port 2 is connected to an outlet of the evaporator 3;

[0029] A coolant return pipe 7 is connected between the condensate return port 1 and the evaporator 3, a coolant output pipe 8 is connected between the condensate output port 2 and the evaporator 3, a heat dissipation coil 9 arranged at the condenser 5 is connected between the coolant return pipe 7 and the coolant output pipe 8, and the coolant return pipe 7, the liquid inlet end of the heat dissipation coil 9 and the liquid inlet end of the evaporator 3 are connected through an electric three-way valve 10.

[0030] The inlet and outlet of the evaporator 3 are respectively connected to an evaporator liquid inlet pipe 13 and an evaporator liquid outlet pipe 14. The evaporator liquid inlet pipe 13 is connected to the coolant return pipe 7, and the evaporator liquid outlet pipe 14 is connected to the coolant output pipe 8.

[0031] The heat dissipation coil 9 is connected with a coil liquid inlet pipe 15 and a coil liquid outlet pipe 16 , and the electric three-way valve 10 is arranged between the coil liquid inlet pipe 15 , the evaporator liquid inlet pipe 13 and the coolant return pipe 7 .

[0032] In this embodiment, the condenser 5 includes a condenser shell 11 and a condenser coil 12 arranged in the condenser shell 11. The heat dissipation coil 9 is arranged in the condenser shell 11 and is located at the upstream position of the condenser coil 12. The upstream position is a position closer to the condensate return port 1. Since the heat dissipation coil 9 is upstream of the condenser 5, the heat dissipated by it during operation can improve the condensation pressure in the condenser 5, and cooperate with the condensation pressure regulating valve to fine-tune the condensation pressure of the condenser 5 to ensure the normal operation and output of the critical state of the refrigeration cycle system.

[0033] In this embodiment, the coolant return pipe 7 is provided with a return end liquid connector 17, a water tank 18 and a water pump 19 in sequence from the condensate return port 1, and the coolant output pipe 8 is provided with an output end liquid connector 20 and a filter 21 in sequence from the condensate output port 2. The water tank 18 is installed with a safety valve 22 and an automatic exhaust valve 24, and is also connected to a drain valve 23. The coil outlet pipe 16 and the evaporator outlet pipe 14 are both provided with a check valve 25 that can flow to the condensate output port 2.

[0034] The inlet and outlet of the condenser coil 12 are respectively provided with a condenser liquid inlet pipe 26 and a condenser liquid outlet pipe 27, a differential pressure regulating valve 28 is connected between the condenser liquid inlet pipe 26 and the condenser liquid outlet pipe 27, and a high pressure regulating valve 29 and a liquid storage tank 30 are sequentially connected from the condenser 5 end between the condenser liquid outlet pipe 27 and the expansion valve 6. The setting of the differential pressure regulating valve 28 and the high pressure regulating valve 29 can effectively realize the regulation of the condensing pressure under the required conditions, ensuring the normal operation of the refrigeration cycle and the output of cooling capacity.

[0035] The present embodiment also provides an airborne liquid cooling system control method, which is implemented using one of the aforementioned airborne liquid cooling systems, and includes controlling the electric three-way valve 10 according to the atmospheric temperature to control the flow of the heat dissipation coil 9, thereby achieving regulation of the heat dissipation on the condensation side, wherein the atmospheric temperature is calculated based on the altitude, or is obtained based on a temperature sensor arranged at the ram air inlet on the condensation side.

[0036] The above-mentioned example is calculated based on the altitude:

[0037] Specifically, when there is an altitude signal input, the control logic calculates the atmospheric temperature according to the altitude, determines the initial value of the three-way valve opening in stages, and then fine-tunes the opening according to the condensation temperature or pressure to correspond to the impact of the flight altitude change on the condensation side. In this embodiment, the input altitude is divided into three working sections, namely, the low altitude range 0~H L , middle range H L ~H H 、High altitude range H H ~H max The three ports of the electric three-way valve 10 are respectively set as port a connected to the condensate return port 1, port b connected to the evaporator 3, and port c connected to the heat dissipation coil 9;

[0038] Altitude is between 0 and 100 km. L When the low altitude range is at an altitude of 100 km / h, there are two modes:

[0039] Mode (1): The circulating coolant passes through the coolant return pipe 7, the water tank 18, the water pump 19 to the electric three-way valve 10, the control valve ab is turned on and ac is closed, the circulating coolant passes through the ab channel to the evaporator 3, absorbs the cold of the evaporation cycle, and after cooling, passes through the coolant output pipe 8, the check valve 25, the filter 21 and the output end liquid connector 20 to the coolant output port, outputs to the user load, absorbs the load heat and then circulates to the condensate return port 1; then absorbs the equipment load heat and then circulates to the return end liquid connector 17 and the water tank 18.

[0040] Mode (2): Altitude between 0 and 3000 m L Due to weather changes, altitude rise and other factors, the condensing side is in the operating temperature range of the differential pressure regulating valve 28 and the high pressure regulating valve 29, T 供 ≥T 设定 +△t means that the evaporation side still needs to be cooled. The differential pressure regulating valve 28 and the high pressure regulating valve 29 arranged on the evaporation cycle refrigeration circuit are used to adjust the condensation pressure to ensure the normal operation of the refrigeration cycle and the output of cooling capacity.

[0041] The inlet and outlet of the condenser 5 are respectively provided with a condenser liquid inlet pipe 26 and a condenser liquid outlet pipe 27, a differential pressure regulating valve 28 is connected between the condenser liquid inlet pipe 26 and the condenser liquid outlet pipe 27, and a high-pressure regulating valve 29 and a liquid storage tank 30 are sequentially connected from the end of the condenser 5 between the condenser liquid outlet pipe 27 and the expansion valve 6;

[0042] Where T 供 is the circulating coolant temperature at the condensate outlet 2, i.e., the circulating coolant temperature after being processed by the entire system; T 设定 It is the target value of the circulating coolant temperature at the condensate outlet 2, which is the target temperature set by the control part of the entire onboard liquid cooling system; △t is the fluctuation range of the circulating coolant temperature at the condensate outlet 2, which is generally 0.1-2℃ and is determined based on the equipment accuracy and user requirements;

[0043] The altitude is H H ~H max When the altitude range is:

[0044] The circulating coolant passes through the coolant return pipe 7, the water tank 18, the water pump 19 to the electric three-way valve 10, and the ac in the control valve is turned on and ab is closed. The circulating coolant passes through the electric three-way valve 10 to the heat dissipation coil 9, absorbs the coldness of the evaporation cycle, and after cooling, passes through the coolant output pipe 8, the check valve 25, the filter 21 and the output end liquid connector 20 to the coolant output port, outputs to the user load, and circulates to the condensate return port 1 after absorbing the load heat; then, it absorbs the equipment load heat and circulates to the return end liquid connector 17 and the water tank 18.

[0045] Within this range, when the altitude continues to rise and the compressed air temperature drops to a certain range, the heat dissipation of the heat dissipation coil 9 in the compressed air duct will be greater than the heat absorbed by the liquid cooling system from the user side. According to the change in the liquid supply temperature, the electric three-way valve 10 adjusts the opening degree of the ac and ab channels. Since the evaporation circulation system is not in operation, there is no heat exchange at the evaporator 3, which only becomes a part of the flow channel. At this time, there is no heat exchange at the evaporator 3, and the diverted coolant in the ab channel passes through the evaporator 3 and bypasses the heat dissipation coil 9 and is connected to the liquid supply main line, which plays a role in regulating the heat dissipation of the radiator. The liquid supply main line is a main line formed by connecting the coolant return pipe 7 with the coolant output pipe 8 through the evaporator.

[0046] The altitude is H L ~H H In the middle range, there is a state in which the evaporative cycle refrigeration system works while the liquid cooling pipeline diversion mode exists at the same time, and the ac channel and the ab channel in the electric three-way valve 10 are controlled to be opened.

[0047] That is, when the evaporative cycle refrigeration system is working, the electric three-way valve 10 is opened to adjust part of the hot circulating fluid to be transferred to the heat dissipation coil 9. Since the heat dissipation coil 9 is upstream of the condenser 5, the heat dissipated can improve the condensation pressure in the condenser 5, and cooperate with the condensation pressure regulating valve to fine-tune the condensation pressure of the condenser 5 to ensure the normal operation and output of the critical state of the refrigeration cycle system.

[0048] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0049] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. An airborne liquid cooling system, comprising a condensate return port (1) and a condensate output port (2) connected to an airborne device, and also comprising an evaporative cycle refrigeration circuit, wherein an evaporator (3) is provided in the evaporative cycle refrigeration circuit, the condensate return port (1) is connected to an inlet of the evaporator (3), and the condensate output port (2) is connected to an outlet of the evaporator (3); characterized in that: A coolant return pipe (7) is connected between the condensate return port (1) and the evaporator (3), a coolant output pipe (8) is connected between the condensate output port (2) and the evaporator (3), a heat dissipation coil (9) arranged at the condenser (5) is connected between the coolant return pipe (7) and the coolant output pipe (8), and the coolant return pipe (7), the liquid inlet end of the heat dissipation coil (9) and the liquid inlet end of the evaporator (3) are connected via an electric three-way valve (10).

2. The airborne liquid cooling system according to claim 1, characterized in that: A condenser (5) is provided in the evaporative cycle refrigeration circuit. The condenser (5) comprises a condenser shell (11) and a condenser coil (12) arranged in the condenser shell (11). The heat dissipation coil (9) is arranged in the condenser shell (11).

3. The airborne liquid cooling system according to claim 1, characterized in that: The inlet and outlet of the evaporator (3) are respectively connected to an evaporator liquid inlet pipe (13) and an evaporator liquid outlet pipe (14); the evaporator liquid inlet pipe (13) is connected to a coolant return pipe (7); and the evaporator liquid outlet pipe (14) is connected to a coolant output pipe (8). The heat dissipation coil (9) is connected to a coil liquid inlet pipe (15) and a coil liquid outlet pipe (16), and the electric three-way valve (10) is arranged between the coil liquid inlet pipe (15), the evaporator liquid inlet pipe (13) and the coolant return pipe (7).

4. The airborne liquid cooling system according to claim 3, characterized in that: The coolant return pipe (7) is provided with a return end liquid connector (17), a water tank (18) and a water pump (19) in sequence from the condensate return port (1), and the coolant output pipe (8) is provided with an output end liquid connector (20) and a filter (21) in sequence from the condensate output port (2).

5. The airborne liquid cooling system according to claim 4, characterized in that: A safety valve (22) and an automatic exhaust valve (24) are installed on the water tank (18), and a drain valve (23) is also connected to the water tank (18).

6. The airborne liquid cooling system according to claim 3, characterized in that: Both the coil liquid outlet pipe (16) and the evaporator liquid outlet pipe (14) are provided with a check valve (25) that enables the condensate to flow toward the condensate outlet (2).

7. The airborne liquid cooling system according to claim 2, characterized in that: An expansion valve (6) is provided in the evaporative cycle refrigeration circuit; a condenser liquid inlet pipe (26) and a condenser liquid outlet pipe (27) are provided at the inlet and outlet of the condenser coil (12), respectively; a differential pressure regulating valve (28) is connected between the condenser liquid inlet pipe (26) and the condenser liquid outlet pipe (27); and a high-pressure regulating valve (29) and a liquid storage tank (30) are connected in sequence from the condenser (5) end between the condenser liquid outlet pipe (27) and the expansion valve (6).

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