Multi-phase flow thermal control system and method

Abstract

The invention discloses a multiphase flow thermal control system and method.The thermal control system comprises a control system, a temperature sensor and a plurality of cooling loops, each cooling loop comprises a refrigerant container, a cooling backflow pipe and a multiphase flow spraying pipe which are connected in series, and the refrigerant containers are used for providing refrigerants; the cooling return pipe is connected with the multiphase flow spray pipe through a refrigeration pipeline, and the multiphase flow spray pipe and the refrigeration pipeline are used for exchanging heat with photoelectric equipment; the cooling loop is further provided with a flow control device, the temperature sensor is used for monitoring the temperature of the photoelectric equipment, and the control system is used for controlling the flow control device according to temperature data so as to change the refrigerant flow in the cooling loop. The multi-phase flow spray pipe and the refrigeration pipeline serve as a core heat exchange structure, the heat exchange efficiency with the photoelectric equipment is effectively improved through multi-phase heat exchange, the cooling loops are arranged in a partitioned mode, the refrigerant flow of the cooling loops is accurately controlled through the flow control device, and partitioned accurate thermal control is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal control for optoelectronic devices, and particularly to a multiphase flow thermal control system and method. Background Art

[0002] With the wide application of optoelectronic devices in fields such as earth remote sensing and weather prediction, their normal operation faces the test of extreme temperature changes in the near-earth space environment. Common optoelectronic devices such as optical imaging systems (such as high-resolution cameras, infrared sensors), laser devices (ranging radars, high-speed communication terminals), spectrometers (for detecting atmospheric or celestial components), navigation and positioning devices (star sensors, optical navigation cameras), and solar cell arrays, etc. If the temperature of the optoelectronic device is too high, it will not be able to work properly. Therefore, efficient thermal control of the optoelectronic device is required.

[0003] Currently, the thermal control technologies for optoelectronic devices mainly focus on the following methods: (1) Air cooling: Using air flow to carry away the heat generated by the device; this method has a simple structure, but low heat dissipation efficiency and is difficult to meet the requirements of high-power optoelectronic devices. (2) Water cooling system: Taking away heat through water flow, having good heat dissipation performance; however, the water cooling system requires a complex pipeline layout and there is a risk of leakage, and the maintenance cost is relatively high. (3) Thermoelectric refrigeration: Using the thermoelectric effect to achieve temperature regulation; although it can accurately control the temperature of the overall optoelectronic device, the refrigeration capacity is limited and it is difficult to meet the refrigeration requirements of high-power devices. In addition, the above three methods all dissipate heat from the overall optoelectronic device and cannot achieve precise zone-by-zone thermal control. Therefore, there is an urgent need for a new thermal control system to achieve efficient zone-by-zone precise thermal control of high-power optoelectronic devices. Summary of the Invention

[0004] Object of the Invention: Aiming at the disadvantages of the prior art in the temperature control of high-power optoelectronic devices, such as low efficiency and inability to achieve precise zone-by-zone temperature control, the present invention provides a multiphase flow thermal control system and method, which can implement efficient zone-by-zone precise thermal control of optoelectronic devices.

[0005] Technical Solution: To solve the above problems, the present invention adopts a multiphase flow thermal control system, including a control system, a temperature sensor, and a plurality of cooling circuits. The cooling circuit includes a refrigerant container, a cooling return pipe, and a multiphase flow nozzle connected in series. The refrigerant container is used to provide refrigerant. The cooling return pipe and the multiphase flow nozzle are connected through a refrigeration pipeline. The multiphase flow nozzle and the refrigeration pipeline are used to exchange heat with the optoelectronic device; a flow control device is further provided on the cooling circuit. The temperature sensor is used to monitor the temperature of the optoelectronic device, and the control system is used to control the flow control device according to the temperature data to change the refrigerant flow rate in the cooling circuit.

[0006] Further, the refrigerant container is installed on the main pipeline, and several cooling circuits share one refrigerant container. The cooling return pipes and multi-phase flow nozzles in each cooling circuit are arranged in parallel with those in other cooling circuits.

[0007] Further, the flow control device includes a pressure reducing valve and a booster pump. The pressure reducing valve is installed on the main pipeline, between the refrigerant container and the cooling return pipe, and the booster pump is installed on the main pipeline, between the refrigerant container and the multi-phase flow nozzle.

[0008] Further, the several cooling circuits are laid in different areas of the optoelectronic device to achieve heat exchange with different partitions of the optoelectronic device.

[0009] Further, the flow control device further includes several throttle valves. One throttle valve is provided in each cooling circuit, and the throttle valve is connected to the multi-phase flow nozzle to independently control the refrigerant flow rate of each cooling circuit.

[0010] Further, a pressure sensor is provided in the cooling return pipe, and the control system receives the data of the pressure sensor and controls the flow control device according to this data.

[0011] Further, the refrigeration pipeline is arranged in an S shape.

[0012] Further, the multi-phase flow nozzle adopts a divergent nozzle structure, and a multi-phase flow distributor is provided at the inlet. The multi-phase flow nozzle is made of foam carbon material.

[0013] The present invention also provides a control method for the multi-phase flow thermal control system, including the following steps:

[0014] Step 1: Arrange several cooling circuits in different areas of the optoelectronic device, so that the multi-phase flow nozzles and refrigeration pipelines in each cooling circuit exchange heat with heat sources in different areas, and install temperature sensors at the heat source positions where the refrigeration pipelines are located;

[0015] Step 2: The temperature sensors monitor the temperature at the heat source positions in real time and transmit the temperature data to the control system;

[0016] Step 3: The control system controls the flow control device according to the temperature data to change the refrigerant flow rate in the cooling circuit, so that the temperatures of all heat sources are within a preset range.

[0017] Further, the controlling the flow control device according to the temperature data is specifically that when the temperature data is greater than the preset range, the flow control device is adjusted to increase the refrigerant flow rate, and when the temperature data is less than the preset range, the flow control device is adjusted to decrease the refrigerant flow rate.

[0018] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are as follows: (1) With the multiphase flow nozzle and the refrigeration pipeline as the core heat exchange structure, the heat exchange efficiency with optoelectronic devices is effectively improved through multiphase heat exchange, and the cooling circuits are set up in zones, and the refrigerant flow rates of each cooling circuit are accurately controlled through the flow control device to achieve accurate zone thermal control; (2) The control system and the temperature sensor monitor and adjust the heat exchange efficiency in the cooling circuit in real time to ensure that the temperature of the optoelectronic device always remains within the working range; (3) The circulation of the cooling circuit is monitored in real time through the pressure sensor to ensure the stable operation of the circuit. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the multiphase flow thermal control system of the present invention;

[0020] Figure 2 It is a schematic diagram of the laying structure of the refrigeration pipeline of the present invention;

[0021] Figure 3 It is the front view of the refrigeration pipeline of the present invention;

[0022] Figure 4 It is a schematic diagram of the pipeline connection structure of the cooling circuit of the present invention;

[0023] Figure 5 It is a schematic diagram of the thermal control principle of the present invention. Detailed Embodiment

[0024] As Figures 1 to 4 shown, a multiphase flow thermal control system in this embodiment includes a control system 1, a temperature sensor 7, and a plurality of cooling circuits. The cooling circuit includes a refrigerant container 2, a cooling return pipe 5, and a multiphase flow nozzle 9 that are connected in series. The refrigerant container 2 is installed on the main pipeline and is used to provide refrigerant. All cooling circuits share one refrigerant container 2. The cooling return pipes 5 and multiphase flow nozzles 9 in each cooling circuit are arranged in parallel with the cooling return pipes 5 and multiphase flow nozzles 9 of other cooling circuits. The cooling return pipe 5 and the multiphase flow nozzle 9 in each parallel circuit are connected through a refrigeration pipeline 11. The multiphase flow nozzle 9 and the refrigeration pipeline 11 are used for heat exchange with the optoelectronic device 6. The refrigeration pipeline 11 is arranged in an S shape to increase the heat exchange stroke and area of the pipeline.

[0025] The multiphase flow nozzle 9 is a heat exchange structure with mature technology, so its basic structure will not be elaborated here. In this embodiment, the multiphase flow nozzle 9 adopts a divergent nozzle structure. The multiphase flow nozzle 9 is made of foam carbon material, and the foam carbon material has high thermal conductivity, which can improve the heat exchange efficiency. A multiphase flow distributor is arranged at the inlet of the multiphase flow nozzle 9 to promote the effective mixing of the liquid phase and the gas phase and prevent the liquid phase from accumulating on the wall due to surface tension, which affects the flow and heat exchange efficiency.

[0026] A flow regulating device is provided on the cooling circuit, including a pressure reducing valve 3, a booster pump 10 and a throttle valve 8. The pressure reducing valve 3 is installed on the main pipeline, between the refrigerant container 2 and the cooling return pipe 5. The booster pump 10 is installed on the main pipeline, between the refrigerant container 2 and the multiphase flow nozzle 9. A throttle valve 8 is provided in each cooling circuit, and the throttle valve 8 is connected to the multiphase flow nozzle 9.

[0027] The temperature sensor 7 is used to monitor the temperature of the optoelectronic device. A pressure sensor 4 is provided in each cooling return pipe 5 to monitor the pressure change during the flow of the coolant in the cooling return pipe 5. The control system 1 receives the data from the temperature sensor 7 and the pressure sensor 4, and controls the flow control device according to the corresponding data to change the refrigerant flow rate in the cooling circuit, thereby changing the heat exchange efficiency of the cooling circuit, so that the optoelectronic device always remains within the preset working temperature range.

[0028] As Figure 5 shown, the working principle of the thermal control system of the present invention is as follows: The refrigerant container 2 provides refrigerant for each cooling circuit, and the refrigerant circulates in the pipeline. After the refrigerant enters the multiphase flow nozzle 9, through the liquid-gas two-phase flow cooling technology of the nozzle, the liquid-phase refrigerant absorbs the heat of the optoelectronic device and evaporates into gas. The gas-phase refrigerant exchanges heat with the optoelectronic device through high-speed flow. The interaction between the gas-phase refrigerant and the liquid refrigerant helps to improve the heat exchange efficiency. After heat exchange through the multiphase flow nozzle 9, the refrigerant enters the refrigeration pipeline 11 to exchange heat with the optoelectronic device again, and then flows into the cooling return pipe 5. The cooling return pipe 5 is used to reduce the temperature of the refrigerant, and after cooling it, it flows back into the refrigerant container 2 to continue the cycle. The control system 1 controls the refrigerant flow rate through the data of the temperature sensor 7 and the pressure sensor 4. By adjusting the pressure reducing valve 3 and the booster pump 10, the flow rates of each cooling circuit can be synchronously regulated. By adjusting the throttle valve 8, the cooling circuit can be independently regulated, and the refrigerant flow rate can be flexibly regulated. Each cooling circuit is responsible for the thermal control of a partition of the optoelectronic device, so as to achieve independent and precise regulation of each partition of the optoelectronic device.

[0029] The present invention also provides a control method for the above-mentioned multiphase flow thermal control system, including the following steps;

[0030] Step 1: Arrange several cooling circuits in different areas of the optoelectronic device 6, so that the multiphase flow nozzles 9 and the refrigeration pipelines 11 in each cooling circuit exchange heat with the heat sources in different areas, and install temperature sensors 7 at the heat source positions where the refrigeration pipelines 11 are located. This embodiment includes three rows of optoelectronic devices. The overall area of each row of optoelectronic devices is divided into six different heat source areas, and cooling circuits are respectively set for thermal control. Then, the three rows of optoelectronic devices are connected in parallel through pipelines and connected to the same controller 1 and refrigerant container 2.

[0031] Step 2: The temperature sensor 7 monitors the temperature at the heat source location in real time, and the pressure sensor 4 monitors the pressure in the cooling return pipe in real time, and transmits the data to the control system 1.

[0032] Step 3: The control system 1 controls the flow control device according to the sensor data to change the refrigerant flow rate in the cooling circuit, so that the temperatures of all heat sources are within the preset range. The specific adjustment process is as follows: when the temperature data is greater than the preset range, the flow control device is adjusted to increase the refrigerant flow rate; when the temperature data is less than the preset range, the flow control device is adjusted to decrease the refrigerant flow rate. If the overall large-area temperature of the optoelectronic device is relatively high, the pressure reducing valve 3 and the booster pump 10 are preferentially adjusted for the overall regulation of the cooling circuit. If the temperature of an individual small area is abnormal, the throttle valve 8 of the cooling circuit is preferentially adjusted. If the pressure sensor 4 exceeds the preset pressure value, the refrigerant flow rate in the cooling circuit is reduced to ensure the stable circulation of the refrigerant in the circuit.

[0033] In summary, the present invention takes the multiphase flow nozzle and the refrigeration pipeline as the core heat exchange structure, effectively improves the heat exchange efficiency with the optoelectronic device through multiphase heat exchange, and sets up cooling circuits in zones, and accurately controls the refrigerant flow rate of each cooling circuit through the flow control device to achieve accurate zone thermal control. The control system and the temperature sensor monitor and adjust the heat exchange efficiency in the cooling circuit in real time to ensure that the temperature of the optoelectronic device always remains within the working range. The circulation of the cooling circuit is also monitored in real time through the pressure sensor to ensure the stable operation of the circuit.

Claims

1. A multiphase flow thermal control system, characterized in that: The invention comprises a control system (1), a temperature sensor (7), and a plurality of cooling circuits, wherein the cooling circuit comprises a refrigerant container (2), a cooling return pipe (5), and a multiphase flow nozzle (9) connected in series, the refrigerant container (2) is used to provide refrigerant, the cooling return pipe (5) and the multiphase flow nozzle (9) are connected via a refrigeration pipe (11), and the multiphase flow nozzle (9) and the refrigeration pipe (11) are used to exchange heat with a photoelectric device; a flow control device is also provided on the cooling circuit, the temperature sensor (7) is used to monitor the temperature of the photoelectric device, and the control system (1) is used to control the flow control device according to temperature data to change the refrigerant flow in the cooling circuit.

2. The multiphase flow thermal control system according to claim 1, characterized in that: The refrigerant container (2) is installed on the main pipeline, and a plurality of cooling circuits share one refrigerant container (2). The cooling return pipe (5) and the multiphase flow nozzle (9) in each cooling circuit are arranged in parallel with the cooling return pipe (5) and the multiphase flow nozzle (9) of other cooling circuits.

3. The multiphase flow thermal control system according to claim 2, characterized in that: The flow control device comprises a pressure reducing valve (3) and a booster pump (10); the pressure reducing valve (3) is installed on the main pipeline and is located between the refrigerant container (2) and the cooling return pipe (5); the booster pump (10) is installed on the main pipeline and is located between the refrigerant container (2) and the multiphase flow nozzle (9).

4. The multiphase flow thermal control system according to claim 3, characterized in that: The plurality of cooling circuits are laid in different areas of the photovoltaic device to achieve heat exchange with different partitions of the photovoltaic device.

5. The multiphase flow thermal control system according to claim 4, characterized in that: The flow control device also includes a plurality of throttle valves (8), each cooling circuit being provided with a throttle valve (8), and the throttle valve (8) being connected to the multiphase flow nozzle (9) to independently control the refrigerant flow of each cooling circuit.

6. The multiphase flow thermal control system according to claim 1, characterized in that: A pressure sensor (4) is provided in the cooling return pipe (5), and the control system (1) receives data from the pressure sensor (4) and controls the flow control device according to the data.

7. The multiphase flow thermal control system according to claim 1, characterized in that: The refrigeration pipes (11) are arranged in an S shape.

8. The multiphase flow thermal control system according to claim 1, characterized in that: The multiphase flow nozzle (9) adopts a gradually diverging nozzle structure, and a multiphase flow distributor is arranged at the inlet. The multiphase flow nozzle (9) is made of foamed carbon material.

9. A control method for a multiphase flow thermal control system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, arranging a plurality of cooling circuits in different areas of the photovoltaic device (6), so that the multiphase flow nozzle (9) and the refrigeration pipe (11) in each cooling circuit exchange heat with the heat source in the different areas, and installing a temperature sensor (7) at the heat source position where the refrigeration pipe (11) is located; Step 2, the temperature sensor (7) monitors the temperature at the heat source location in real time and transmits the temperature data to the control system (1); Step 3: The control system (1) controls the flow control device according to the temperature data to change the refrigerant flow in the cooling circuit so that the temperature of each heat source is within a preset range.

10. The control method according to claim 9, characterized in that: The control of the flow control device according to the temperature data is specifically that when the temperature data is greater than a preset range, the flow control device is adjusted to increase the refrigerant flow rate, and when the temperature data is less than the preset range, the flow control device is adjusted to reduce the refrigerant flow rate.

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