Short-time accurate thermal control system and method for high-power device

Abstract

The short-time accurate thermal control system comprises a liquid storage device, one end of the liquid storage device is communicated with the inlet end of a working medium conveying pump, the other end of the liquid storage device is communicated with a temperature control valve, and the outlet end of the working medium conveying pump is communicated with the inlet end of a flow channel of the high-power device. The flow channel outlet end of the high-power device is communicated with the temperature control valve; the temperature control valve is further communicated with one end of the working medium reflux pump, the other end of the working medium reflux pump is communicated with one end of the cold box, and the other end of the cold box is communicated with the heat dissipation assembly; and a one-way valve is arranged between the flow channel outlet end of the high-power device and the temperature control valve. According to the short-time accurate thermal control system for the high-power device, different flow requirements can be met for different high-power devices, the flow and the flow velocity of a working medium are controllable, meanwhile, the temperature of the inlet end of a flow channel of the high-power device and the temperature of the outlet end of the flow channel of the high-power device are controlled to be constant, and accurate temperature control is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of spacecraft thermal control technology, relates to high-power devices, and specifically relates to a short-time precise thermal control system and method for high-power devices. Background Art

[0002] As an active microwave imaging payload, Synthetic Aperture Radar (SAR) has the ability to obtain high-resolution images at all times of the day and in all weather conditions, at long imaging distances, and through certain obstructions. Since the launch of the first SAR satellite SEASAT in 1978, after more than 40 years of development, low-Earth orbit (LEO) SAR systems and signal processing technology have become relatively mature. In recent years, with the development of satellite-borne SAR technology, the demand for high spatial resolution and high temporal resolution has been growing, whether in military reconnaissance or civilian monitoring applications. Due to the characteristics of short revisit time and large coverage, medium- and high-orbit SAR has good application prospects in natural disaster monitoring and forecasting, military wide-area reconnaissance, etc., and has become an emerging research hotspot in the SAR field.

[0003] As an important microwave power amplifier device, the traveling wave tube is widely used in various communication satellites. It is a key component of the satellite-borne synthetic aperture radar transmitter and the satellite-borne transponder, and is known as the "heart" of the satellite communication system. The medium and high orbit SAR has high requirements for the performance and technical indicators of the traveling wave tube, requiring greater output power, higher reliability, higher stability and longer life. The performance of the traveling wave tube is severely restricted by the heat dissipation capacity, so it has put forward higher and higher requirements for the development of thermal control technology. It is urgent to quickly develop short-time, high-precision, low-weight and low-cost thermal control technology.

[0004] Spacecraft thermal control technology is to use thermal control methods such as radiators to balance the external heat flux absorbed by the satellite and the internal thermal power consumption, provide a good working temperature environment to maintain the normal operation of the spacecraft in orbit during its life cycle, and optimize the system quality, reliability and heating power. The Chinese patent with application number CN202410487198.4 proposes an integrated thermal control device and system for microsatellite high heat consumption short-time working equipment, which improves the thermal control capability by shortening the heat conduction path between the internal components of the equipment and the heat sink; the Chinese patent with application number CN202410127880.2 proposes a thermal control device for energy recovery and reuse, which uses the spring mechanics of the spring to control the distance between the hot plate and the outer wall of the liquid collection chamber. Application number is

[0005] The Chinese patent CN202410604122.5 proposes a thermal control device for aerospace use, which uses the heat storage characteristics of phase change materials to achieve heat exchange between the phase change cabin and the payload through a heat pipe or a fluid circuit. However, the cost of traditional single-channel thermal control in the prior art to achieve rapid heat dissipation of high-power devices is that it requires a large volume and mass of working fluid, or requires a strong rapid heat dissipation platform, which is difficult to achieve on satellites. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a short-time precise thermal control system and method for high-power devices, so as to solve the technical problem in the prior art that the mass and volume of the working fluid required need to be further reduced while meeting the conditions for low-difficulty and rapid heat dissipation of high-power devices on satellites.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A thermal control system for a high-power device comprises a liquid reservoir, one end of the liquid reservoir is connected to the inlet end of a working fluid delivery pump, the other end of the liquid reservoir is connected to a temperature control valve, the outlet end of the working fluid delivery pump is connected to the inlet end of a flow channel of the high-power device, and the outlet end of the flow channel of the high-power device is connected to the temperature control valve.

[0009] The temperature control valve is also connected to one end of the working fluid reflux pump, the other end of the working fluid reflux pump is connected to one end of the cold box, and the other end of the cold box is connected to the heat dissipation component.

[0010] A one-way valve is arranged between the outlet end of the flow channel of the high-power device and the temperature control valve.

[0011] The present invention also has the following technical features:

[0012] A filling and discharging valve, a filter and a pressure sensor are arranged in sequence between the liquid storage device and the inlet end of the working medium delivery pump.

[0013] The present invention also protects a thermal control method for a high-power device, which is implemented by using the thermal control system for a high-power device as described above; the method specifically comprises the following steps:

[0014] Step 1: According to the thermal control requirements of the high-power device, determine the single working time t of the high-power device, the total heat consumption Q of the high-power device, and the working fluid temperature T at the inlet end of the high-power device flow channel. in And the working fluid temperature T at the outlet of the high-power device flow channel out .

[0015] Step 2: Based on the structural material of the flow channel of the high-power device, select the working fluid for heat exchange in the flow channel of the high-power device and in the pipeline.

[0016] Step three, set the temperature T0 of the low-temperature working fluid stored in the cold box, calculate the initial working fluid mass m0 in the cold box and the initial working fluid mass m0 in the liquid reservoir according to the low-temperature working fluid temperature T0 stored in the cold box, and determine the number of cycles N of the working fluid. After N cycles, thermal control of high-power devices in a single working period is achieved.

[0017] Specifically, in step 3, the specific process of the N-time cycle is as follows: when the high-power device is working, the temperature in the liquid reservoir is T in , the working fluid with a mass of m0 enters the inlet of the flow channel of the high-power device through the working fluid delivery pump, and then the outlet temperature of the flow channel of the high-power device is T out , the mass is m0. At this time, the ball screw of the cold box starts to rotate, and part of the low-temperature working fluid in the cold box flows out. The temperature of the part of the low-temperature working fluid flowing out of the cold box is T0 and the mass is m1. The temperature control valve controls the temperature of the pipe connecting the high-power device and the temperature control valve to be T out The working fluid flow of the temperature control valve enters the liquid reservoir, and the temperature control valve also controls the low-temperature working fluid flow of the temperature T0 in the pipeline connecting the cold box and the temperature control valve to enter the liquid reservoir. After the two working fluid flows of different temperatures are mixed, the temperature T in , the working fluid with a mass of m0+m1 flows into the liquid reservoir through the temperature control valve, which is the first cycle.

[0018] The temperature in the reservoir is T in , the working fluid with a mass of m0+m1 enters the inlet of the flow channel of the high-power device again through the working fluid delivery pump, and then the outlet temperature of the flow channel of the high-power device is T out , the mass of the working fluid is m0+m1. At this time, the ball screw of the cold box starts to rotate again, and part of the low-temperature working fluid in the cold box flows out. The temperature of the part of the low-temperature working fluid flowing out of the cold box is T0 and the mass is m2. After the two working fluid flows with different temperatures are mixed, the temperature is T in , the working fluid with a mass of m0+m1+m2 flows into the liquid reservoir through the temperature control valve, which is the second cycle.

[0019] Repeat N times, that is, cycle N times. At this time, the mass in the cold box is m1+m2+…m N The low-temperature working fluid flows into the liquid reservoir, and the mass of the working fluid in the liquid reservoir is m0+m1+m2+…m N And m1+m2+…m N ≤m0 and the working fluid temperature in the reservoir is still T in .

[0020] Specifically, the single thermal control of the high-power device during the non-working period is that the temperature in the liquid reservoir is T in , the mass is m1+m2+…m NThe working fluid is transported to the cold box through the working fluid reflux pump, and the working fluid in the cold box is cooled to the working fluid temperature T by the heat dissipation component. in Control the temperature to the low temperature working fluid temperature T0.

[0021] Preferably, the temperature control valve controls the working fluid temperature entering the liquid reservoir to be constant at T in .

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] (I) The short-term precise thermal control system for high-power devices in the present invention can meet different flow requirements for different specific high-power devices, and the flow rate and flow velocity of the working fluid are controllable. At the same time, the temperature of the flow channel inlet end and the temperature of the flow channel outlet end of the high-power device are controlled to be constant, thereby achieving precise temperature control.

[0024] (II) The short-time precise thermal control system for high-power devices in the present invention can achieve short-time precise temperature control of high-power devices with pulse heat consumption power reaching MW level and average heat consumption power reaching tens of kW, thus solving the thermal control problem of high-power microwave sensitive devices such as traveling wave tubes, klystrons and accelerating tubes, which are the core components of high-orbit SAR.

[0025] (III) The short-time precise thermal control system for high-power devices in the present invention is different from the traditional single-channel heat dissipation system in that the cost of achieving rapid heat dissipation of high-power devices is that it requires a large volume and mass of working fluid, or requires a very strong rapid heat dissipation platform, which is difficult to implement on satellites.

[0026] (IV) The short-time precise thermal control method for high-power devices in the present invention utilizes the rapid mixing of the pre-stored low-temperature working fluid with the working fluid at the outlet of the high-power device, thereby realizing multiple circulations of the working fluid in a short time. Compared with the single-path thermal control method, the mass and volume of the working fluid required by this thermal control method can be compressed to less than 10%, which greatly reduces the mass and volume of the working fluid required for thermal control and greatly reduces the load pressure, so that this method can be used for high-power devices on satellites.

[0027] (V) The short-term precise thermal control method for high-power devices in the present invention can flexibly set the low-temperature point and mass of the working fluid stored in the cold box according to the heat consumption and temperature control requirements of the high-power devices, and use the heat dissipation component to perform thermal control on the working fluid in the cold box during the non-working period of the high-power devices, thereby greatly reducing the heat dissipation pressure in a short period of time and achieving rapid temperature control during the working period. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a schematic diagram of the composition of a short-time precise thermal control system for high-power devices in the present invention.

[0029] The meanings of the numbers in the figure are: 1-liquid reservoir, 2-working fluid delivery pump, 3-temperature control valve, 4-high-power device, 5-working fluid reflux pump, 6-cold box, 7-heat dissipation component, 8-check valve, 9-addition and discharge valve, 10-filter, 11-pressure sensor, 12-pipeline.

[0030] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0031] It should be noted that the materials, devices and equipment used in the present invention, unless otherwise specified, are all materials, devices and equipment known in the prior art. For example, the working fluid delivery pump 2 adopts a known working fluid delivery pump, the temperature control valve 3 adopts a known temperature control valve, the working fluid return pump 5 adopts a known working fluid return pump, the heat dissipation component 7 adopts a known heat dissipation component, and the one-way valve 8 adopts a known one-way valve.

[0032] In the present invention, various devices are connected mainly through pipelines 12, and the working fluid delivery pump 2, temperature control valve 3, working fluid reflux pump 5 and one-way valve 8 arranged on the pipeline 12 as needed are opened or closed according to the process requirements.

[0033] In the present invention, the material of the flow channel of the high-power device 4 is the same as the material of the pipeline 12 .

[0034] In the present invention, the high-power device 4 refers to a device with a heat consumption power greater than or equal to 10 kW.

[0035] In the present invention, m N It refers to the mass of part of the low-temperature working fluid flowing out of the cold box 6 during the Nth cycle.

[0036] In the present invention, the initial working fluid mass m0 in the liquid reservoir 1 refers to the working fluid mass m0 in the liquid reservoir 1 when the high-power device 4 starts to work.

[0037] In the present invention, the working fluid temperature in the liquid storage tank 1 is constant at T in .

[0038] In the present invention, the working fluid temperature at the inlet end of the flow channel of the high-power device 4 is constant at T in , the working fluid temperature at the outlet of the high-power device 4 is constant at T out .

[0039] In the present invention, the initial working fluid mass m0 in the cold box 6 refers to the working fluid mass m0 in the cold box 6 when the high-power device 4 starts to work.

[0040] In the present invention, during the working period of the high-power device 4, the temperature of the low-temperature working medium in the cold box 6 is constant at T0.

[0041] The technical idea of ​​the present invention is that the high-power devices such as traveling wave tubes, klystrons and accelerating tubes, which are the core components of high-orbit SAR, have certain particularities: first, the total heat consumption is large and the heat consumption power is extremely large during the short pulse working time. The average heat consumption power of high-power devices reaches tens of kW, and the pulse heat consumption power reaches the MW level; second, when the device temperature increases and the temperature distribution is uneven, it will cause the internal structure size of the device to change, resulting in changes in microwave performance, such as frequency drift and output power drop, which seriously affects the performance of high-power devices, so high temperature stability is required. In response to the special heat dissipation requirements of such high-power devices, the present invention proposes a short-time precise thermal control system and method for high-power devices, which can achieve the requirements of high temperature stability, short temperature control time and low cost under large heat consumption.

[0042] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0043] Embodiment 1:

[0044] This embodiment provides a short-term precise thermal control system for high-power devices, such as Figure 1 As shown, it includes a liquid reservoir 1, one end of the liquid reservoir 1 is connected to the inlet end of the working fluid delivery pump 2, the other end of the liquid reservoir 1 is connected to the temperature control valve 3, the outlet end of the working fluid delivery pump 2 is connected to the flow channel inlet end of the high-power device 4, and the flow channel outlet end of the high-power device 4 is connected to the temperature control valve 3.

[0045] The temperature control valve 3 is also connected to one end of the working fluid reflux pump 5 , the other end of the working fluid reflux pump 5 is connected to one end of the cold box 6 , and the other end of the cold box 6 is connected to the heat dissipation component 7 .

[0046] A one-way valve 8 is provided between the outlet end of the flow channel of the high-power device 4 and the temperature control valve 3 .

[0047] As a preferred solution of this embodiment, a charging and discharging valve 9, a filter 10 and a pressure sensor 11 are sequentially arranged between the liquid reservoir 1 and the inlet end of the working fluid delivery pump 2.

[0048] In this embodiment, the liquid reservoir 1 is a large liquid reservoir with a ball screw, which is used to store a working fluid at a constant temperature.

[0049] In this embodiment, the working fluid delivery pump 2 is started during the working period of the high-power device 4, and is used to extract the working fluid from the liquid reservoir 1 and send it to the high-power device 4. Its pumping speed is determined by the flow requirement of the high-power device 4 to achieve controllable flow.

[0050] In this embodiment, the high-power device 4 is a high-power device that needs to be thermally controlled. The interior or surface of the high-power device 4 contains a flow channel for the flow of working fluid for connecting to a thermal control loop.

[0051] In this embodiment, the working medium reflux pump 5 is started during the non-operating period of the high-power device 4 to extract the working medium from the liquid storage tank 1 and send it back to the cold box 6 .

[0052] In this embodiment, the cold box 6 is a box with a ball screw and stores a cryogenic medium with a temperature of T0. The ball screw can control the flow rate of the cryogenic medium in the cold box 6.

[0053] In this embodiment, the heat dissipation component 7 cools the working fluid in the cold box 6 to the low-temperature working fluid temperature T0 in the cold box 6 during the non-working period of the high-power device 4, thereby ensuring that the thermal control system operates normally again in the next working period. The heat dissipation demand is determined by the duration of the non-working fluid time and the quality of the working fluid to be cooled, and the heat dissipation power is related to the area size.

[0054] In this embodiment, the one-way valve 8 is used to control the flow direction of the working medium.

[0055] In this embodiment, the addition and discharge valve 9 is a device for discharging gas in the pipeline 12 to prevent gas from accumulating in the pipeline 12 and causing blockage of the pipeline 12 or affecting the normal operation of the pipeline 12 .

[0056] In this embodiment, the filter 10 is used to filter the working medium to ensure the purity of the working medium at the inlet end of the flow channel of the high-power device 4 and to prevent impurities from entering the corrosion flow channel.

[0057] In this embodiment, the pressure sensor 11 is used to collect the pressure of the working fluid in the pipeline 12 and monitor whether the thermal control loop system works normally.

[0058] Embodiment 2:

[0059] This embodiment provides a short-time precise thermal control method for a high-power device. The method is implemented by using the short-time precise thermal control system for a high-power device of Embodiment 1. The method specifically includes the following steps:

[0060] Step 1: According to the thermal control requirements of the high-power device 4, determine the single working time t of the high-power device 4, the total heat consumption Q of the high-power device 4, and the working fluid temperature T at the inlet end of the flow channel of the high-power device 4. in And the working fluid temperature T at the outlet of the high-power device 4 out .

[0061] In this embodiment, the heat consumption requirement of the accelerating tube device with short-term high heat consumption and extremely high temperature control requirements is: the single working time of the high-power device 4 is t=100s, and the total heat consumption Q=1.5×10 6J, requires the flow channel inlet temperature T of high power device 4 in = 20°C, the outlet temperature of the high-power device 4 is required to be T out =22℃.

[0062] Step 2: Based on the structural material of the flow channel of the high-power device 4 , the working fluid for heat exchange transported in the flow channel of the high-power device 4 and in the pipeline 12 is selected.

[0063] In this embodiment, since the flow channel of the high-power device 4 is made of oxygen-free copper, the selected working fluid is a 50% ethylene glycol solution containing water. The working fluid has good compatibility with the material of the flow channel of the high-power device 4, has a low freezing point, and has a strong heat exchange capacity.

[0064] Step 3, set the temperature T0 of the low-temperature working medium stored in the cold box 6, calculate the initial working medium mass m0 in the cold box 6 and the initial working medium mass m0 in the liquid storage 1 according to the low-temperature working medium temperature T0 stored in the cold box 6, and determine the number of cycles N of the working medium. After N cycles, the thermal control of the high-power device 4 in a single working period is achieved. The temperature T0 of the low-temperature working medium stored in the cold box 6 is set according to the maximum mass requirement of the thermal control system, the heat consumption and temperature control requirements of the high-power device 4, and the maximum capacity of the thermal control system.

[0065] Among them, the calculation method of m0 is:

[0066]

[0067] Where:

[0068] m0 is the initial mass of the working fluid in the cold box 6 and the initial mass of the working fluid in the liquid reservoir 1, in kg;

[0069] Q is the total heat dissipation of the high-power device 4, in J;

[0070] c p is the specific heat capacity of the working fluid used for heat exchange in the flow channel of the high-power device 4 and the pipeline 12, in units of J / (kg·℃);

[0071] T out is the working fluid temperature at the outlet of flow channel 4 of the high-power device, in °C;

[0072] T0 is the temperature of the low-temperature working fluid stored in the cold box 6, in °C.

[0073] In step 3, the specific process of N cycles is as follows: when the high-power device 4 is working, the temperature in the liquid storage 1 is T in , the working fluid with a mass of m0 enters the flow channel inlet of the high-power device 4 through the working fluid delivery pump 2, and then the flow channel outlet of the high-power device 4 has an outlet temperature of T out, the mass of the working fluid is m0. At this time, the ball screw of the cold box 6 starts to rotate, and part of the low-temperature working fluid in the cold box 6 flows out. The temperature of the part of the low-temperature working fluid flowing out of the cold box 6 is T0 and the mass is m1; the temperature control valve 3 controls the temperature of the pipe 12 connected to the high-power device 4 and the temperature control valve 3 to be T out The working fluid flow of the temperature control valve 3 enters the liquid reservoir 1, and the temperature control valve 3 also controls the low-temperature working fluid flow of the temperature T0 in the pipeline 12 connected to the cold box 6 and the temperature control valve 3 to enter the liquid reservoir 1. After the two working fluid flows of different temperatures are mixed, the temperature T in , the working fluid with a mass of m0+m1 flows into the liquid reservoir 1 through the temperature control valve 3, which is the first cycle.

[0074] The temperature in reservoir 1 is T in , the working fluid with a mass of m0+m1 enters the inlet end of the flow channel of the high-power device 4 through the working fluid delivery pump 2 again, and then the outlet temperature of the flow channel of the high-power device 4 is T out , the mass of the working fluid is m0+m1. At this time, the ball screw of the cold box 6 starts to rotate again, and part of the low-temperature working fluid in the cold box 6 flows out. The temperature of the part of the low-temperature working fluid flowing out of the cold box 6 is T0 and the mass is m2. After the two working fluid flows with different temperatures are mixed, the temperature is T in , the working fluid with a mass of m0+m1+m2 flows into the liquid reservoir 1 through the temperature control valve 3, which is the second cycle.

[0075] Repeat N times, that is, cycle N times. At this time, the mass in the cold box 6 is m1+m2+…m N The low-temperature working fluid flows into the liquid reservoir 1, and the mass of the working fluid in the liquid reservoir 1 is m0+m1+m2+…m N And m1+m2+…m N ≤m0 and the working fluid temperature in the liquid reservoir 1 is still T in .

[0076] The single thermal control of the high-power device 4 during the non-working period is that the temperature in the liquid reservoir 1 is T in , the mass is m1+m2+…m N The working fluid is transported to the cold box 6 through the working fluid reflux pump 5, and the working fluid in the cold box 6 is cooled to a working fluid temperature T by the heat dissipation component 7. in The temperature is controlled to the low temperature working medium temperature T0. In the next working period of the high power device 4, the thermal control system will continue to cycle the thermal control to ensure that the temperature at the inlet end of the flow channel of the high power device 4 is constant at T in , the temperature at the outlet of the high-power device 4 is constant at T out .

[0077] The temperature control valve 3 controls the working fluid temperature entering the liquid reservoir 1 to be constant at T in .

[0078] In this embodiment, the temperature of the low-temperature working medium in the cold box 6 is set to T0 = -30 ° C, the freezing point of 50% ethylene glycol solution containing water is -37.9 ° C, the boiling point is 107.8 ° C, and the density at 20 ° C is ρ = 1073 kg / m 3 and specific heat capacity c p =3281J / (kg·℃)

[0079] Calculate the initial working fluid mass m0 in the cold box 6 and the initial working fluid mass m0 in the liquid reservoir 1 as follows: Determine the number of cycles N = 17 times. That is, only 18 kg of 50% ethylene glycol solution containing water is needed to meet the thermal control of the high-power device 4, of which 9 kg of working fluid at a temperature of 20°C is contained in the liquid reservoir 1; and 9 kg of low-temperature working fluid at a temperature of -30°C is contained in the cold box 6. The mass of low-temperature working fluid that needs to be injected into the liquid reservoir 1 of the cold box 6 for each cycle is 0.36 kg, 0.375 kg, 0.39 kg, etc., and the total does not exceed 9 kg.

[0080] Comparative Example 1:

[0081] This comparative example provides a thermal control method, which adopts a single-path thermal control method known in the prior art. Specifically, in this application example, the mass of the working fluid to be stored at 20°C in the liquid storage 1 is

[0082] Compared with Comparative Example 1, the short-time precise thermal control method for high-power devices proposed in Example 2 reduces the total mass of the working fluid in the liquid reservoir 1 and the cold box 6 required for thermal control to 18 kg, reduces the mass of the working fluid to less than 10%, and reduces the volume to less than 10%, which makes thermal control of high-power devices on satellites feasible, provides a new thermal control technology route for accelerating tube devices, and greatly optimizes the product layout on satellites.

[0083] Embodiment 3:

[0084] This embodiment provides a short-time precise thermal control method for a high-power device. The method of this embodiment is basically the same as the method of embodiment 2, except that: in step 1, the single working time t of the high-power device 4 is changed from 100s to 150s, and the total heat consumption Q is changed from 1.5×10 6 J becomes 2×10 6 J, the flow channel outlet temperature T of high power device 4 out From 22℃ to 24℃.

[0085] Calculate the initial working fluid mass m0 in the cold box 6 and the initial working fluid mass m0 in the liquid reservoir 1 as follows:

[0086] Determine the number of cycles N = 10 times. That is, to meet the thermal control of the high-power device 4, only 24 kg of 50% ethylene glycol solution is needed, of which the liquid reservoir 1 contains 12 kg of working fluid at a temperature of 20°C; the cold box 6 contains 12 kg of low-temperature working fluid at a temperature of -30°C. Each time the cold box 6 cycles, the mass of low-temperature working fluid that needs to be injected into the liquid reservoir 1 is 0.96 kg, 1.04 g, 1.12 kg, etc., and the total does not exceed 12 kg.

[0087] Comparative Example 2:

[0088] This comparative example provides a thermal control method, which adopts a single-path thermal control method known in the prior art. Specifically, in this application example, the mass of the working fluid to be stored at 20°C in the liquid storage 1 is

[0089] Compared with Comparative Example 2, the short-time precise thermal control method for high-power devices proposed in Example 2 reduces the total mass of the working fluid in the liquid reservoir 1 and the cold box 6 required for thermal control to 24 kg, reduces the mass of the working fluid to within 16%, and reduces the volume to within 16%, which makes thermal control of high-power devices on satellites feasible, provides a new thermal control technology route for accelerating tube devices, and greatly optimizes the product layout on satellites.

Claims

1. A thermal control system for a high-power device, comprising a liquid reservoir (1), characterized in that: One end of the liquid reservoir (1) is connected to the inlet end of the working fluid delivery pump (2), the other end of the liquid reservoir (1) is connected to the temperature control valve (3), the outlet end of the working fluid delivery pump (2) is connected to the flow channel inlet end of the high-power device (4), and the flow channel outlet end of the high-power device (4) is connected to the temperature control valve (3); The temperature control valve (3) is also connected to one end of the working fluid reflux pump (5), the other end of the working fluid reflux pump (5) is connected to one end of the cold box (6), and the other end of the cold box (6) is connected to the heat dissipation component (7); A one-way valve (8) is provided between the outlet end of the flow channel of the high-power device (4) and the temperature control valve (3).

2. The thermal control system for high-power devices according to claim 1, characterized in that: A charging and discharging valve (9), a filter (10) and a pressure sensor (11) are arranged in sequence between the liquid storage device (1) and the inlet end of the working fluid delivery pump (2).

3. A thermal control method for a high-power device, characterized in that: The method is implemented by using the thermal control system for high-power devices as described in any one of claims 1 to 2; the method specifically comprises the following steps: Step 1: According to the thermal control requirements of the high-power device (4), determine the single working time t of the high-power device (4), the total heat consumption Q of the high-power device (4), and the working fluid temperature T at the inlet end of the flow channel of the high-power device (4). in and the working fluid temperature T at the outlet of the flow channel of the high-power device (4) out ; Step 2, selecting a working fluid for heat exchange in the flow channel of the high-power device (4) and in the pipeline (12) in combination with the structural material of the flow channel of the high-power device (4); Step three, setting the temperature T0 of the low-temperature working fluid stored in the cold box (6), calculating the initial working fluid mass m0 in the cold box (6) and the initial working fluid mass m0 in the liquid storage device (1) based on the low-temperature working fluid temperature T0 stored in the cold box (6), and determining the number of cycles N of the working fluid. After N cycles, thermal control of the high-power device (4) in a single working time period is achieved.

4. The thermal control method for a high-power device according to claim 3, characterized in that: In step 3, the specific process of the N-time cycle is as follows: when the high-power device (4) is working, the temperature in the liquid storage device (1) is T in , a working fluid with a mass of m0 enters the flow channel inlet of the high-power device (4) through the working fluid delivery pump (2), and then the flow channel outlet of the high-power device (4) has an outlet temperature of T out , a working fluid with a mass of m0. At this time, the ball screw of the cold box (6) starts to rotate, and part of the low-temperature working fluid in the cold box (6) flows out. The temperature of the part of the low-temperature working fluid flowing out of the cold box (6) is T0 and the mass is m1. The temperature control valve (3) controls the temperature of the pipe (12) connecting the high-power device (4) and the temperature control valve (3) to T out The temperature control valve (3) controls the flow rate of a low-temperature working medium with a temperature of T0 in a pipe (12) connected to the cold box (6) and the temperature control valve (3) to enter the liquid reservoir (1). After the two working medium flows with different temperatures are mixed, a low-temperature working medium with a temperature of T0 is obtained. in , the working fluid with a mass of m0+m1 flows into the liquid reservoir (1) through the temperature control valve (3), which is the first cycle; The temperature in the liquid reservoir (1) is T in , the working fluid with a mass of m0+m1 enters the inlet end of the flow channel of the high-power device (4) again through the working fluid delivery pump (2), and then the outlet temperature of the flow channel of the high-power device (4) is T out , a working fluid with a mass of m0+m1. At this time, the ball screw of the cold box (6) starts to rotate again, and part of the low-temperature working fluid in the cold box (6) flows out. The part of the low-temperature working fluid flowing out of the cold box (6) has a temperature of T0 and a mass of m2. After the two working fluid flows with different temperatures are mixed, a temperature of T in , the working fluid with a mass of m0+m1+m2 flows into the liquid storage tank (1) through the temperature control valve (3), which is the second cycle; Repeat N times, that is, cycle N times. At this time, the mass in the cold box (6) is m1+m2+…m N The low-temperature working fluid flows into the liquid reservoir (1), and the mass of the working fluid in the liquid reservoir (1) is m0+m1+m2+…m N And m1+m2+…m N ≤m0 and the working fluid temperature in the liquid reservoir (1) is still T in .

5. The thermal control method for high-power devices according to claim 3, characterized in that: The single thermal control of the high-power device (4) during the non-working period is that the temperature in the liquid storage device (1) is T in , the mass is m1+m2+…m N The working fluid is transported to the cold box (6) through the working fluid reflux pump (5), and the working fluid in the cold box (6) is cooled to a temperature T by a heat dissipation component (7). in Control the temperature to the low temperature working fluid temperature T0.

6. The thermal control method for a high-power device according to claim 3, characterized in that: The temperature control valve (3) controls the temperature of the working fluid entering the liquid storage device (1) to be constant at T in .

Images