Dynamic thermal protection device of space exploration optoelectronic equipment based on flexible heat pipe

Abstract

The invention discloses a dynamic thermal protection device of space exploration optoelectronic equipment based on a flexible heat pipe, which comprises a heat dissipation support arranged on the outer side of the space exploration optoelectronic equipment, a bending driving device and the flexible heat pipe, the heat dissipation support is used for heat dissipation of the space exploration optoelectronic equipment, and the flexible heat pipe comprises a hot end, a cold end and a flexible connecting part. The flexible connecting part is communicated with the hot end and the cold end, the hot end of the flexible heat pipe is fixedly connected with the heat dissipation support, the cold end of the flexible heat pipe is connected to the output end of the bending driving device, the bending driving device drives the cold end of the flexible heat pipe to move, deformation of the flexible connecting part is achieved, and the heat conduction capacity of the flexible heat pipe is changed. According to the dynamic thermal protection device for the space environment detection satellite photoelectric equipment cabin by using the flexible variable heat pipe, the change of the heat conductivity coefficient of the heat pipe is realized by adjusting the bending angle of the flexible variable heat pipe, so that the self-adaptive adjustment of the temperature of the space environment detection satellite photoelectric equipment is realized.

Description

Technical Field

[0001] The present invention relates to thermal protection of space optical / electrical device components, and specifically to a dynamic thermal protection device for a space exploration optoelectronic device based on a flexible heat pipe. Background Art

[0002] With the continuous development of space environment exploration satellites, optoelectronic imaging devices have been widely used in the field of space exploration, such as space optical remote sensor cameras. A good working state is the key to ensuring the imaging quality of space optical remote sensing cameras. Among them, the working temperature has a crucial impact on its imaging quality. Excessive or too low temperature will reduce the optoelectronic conversion ability. The alternating high and low temperatures in the space environment, the influence of solar radiation, and the change of the device's own power consumption will all cause the optoelectronic system to face serious thermal management challenges. Traditional thermal management methods, such as passive heat sinks, heaters, or heat pipes with fixed thermal conductivity, often struggle to adapt to dynamically changing thermal loads, which may lead to overheating or low-temperature failure of the device, affecting the detection accuracy and service life.

[0003] In the prior art, finished devices generally use thermal protection devices with fixed thermal conductivity, which brings the problem that optical remote sensing cameras in space cannot adaptively adjust their heat dissipation ability according to their own temperature. The heat dissipation device with fixed thermal conductivity cannot finely control the temperature of the device, and there is a situation where the device is cooled due to excessive heat dissipation ability before reaching the target working temperature, affecting the detection accuracy of the device. Summary of the Invention

[0004] Object of the Invention: Aiming at the above disadvantages, the present invention provides a dynamic thermal protection device for a space exploration optoelectronic device based on a flexible heat pipe that can adaptively adjust its thermal conductivity.

[0005] Technical Solution: To solve the above problems, the present invention adopts a dynamic thermal protection device for a space exploration optoelectronic device based on a flexible heat pipe, including a heat dissipation bracket, a bending drive device, and a flexible heat pipe arranged outside the space exploration optoelectronic device. The heat dissipation bracket is used for the heat dissipation of the space exploration optoelectronic device. The flexible heat pipe includes a hot end, a cold end, and a flexible connection part. The flexible connection part connects the hot end and the cold end. The hot end of the flexible heat pipe is fixedly connected to the heat dissipation bracket, and the cold end of the flexible heat pipe is connected to the output end of the bending drive device. The bending drive device drives the cold end of the flexible heat pipe to move, realizing the deformation of the flexible connection part and changing the thermal conductivity of the flexible heat pipe.

[0006] Further, the bending drive device includes an electric push rod, a connecting rod, and a heat pipe limit block. The output end of the electric push rod is hinged to the connecting rod, the connecting rod is hinged to the heat pipe limit block, and the heat pipe limit block is fixedly connected to the cold end of the flexible heat pipe. The telescopic movement of the electric push rod drives the heat pipe limit block to move through the connecting rod, thereby driving the cold end of the heat pipe to move.

[0007] Furthermore, the heat dissipation bracket includes a fixing plate, connecting struts, and several layers of heat dissipation plates. The connecting struts connect the fixing plate and all the heat dissipation plates. The space exploration optoelectronic device is disposed between the fixing plate and the heat dissipation plates. The several layers of heat dissipation plates are stacked in sequence, and the hot ends of the flexible heat pipes are fixed between two layers of heat dissipation plates.

[0008] Furthermore, flexible heat pipes are disposed between every two layers of the heat dissipation plates. Multiple layers of heat dissipation plates are fixedly connected with multiple layers of flexible heat pipes, and the flexible heat pipes of adjacent layers are staggeredly arranged.

[0009] Furthermore, the connecting rod includes a driving rod and a driven rod that are hinged to each other. One end of the driving rod is hinged to the outermost layer of heat dissipation plate, and the other end is hinged to the driven rod. The other end of the driven rod is hinged to the heat pipe limiting block. The fixed end of the electric push rod is hinged to the outermost layer of heat dissipation plate, and the output end of the electric push rod is hinged to the rod body of the driving rod.

[0010] Furthermore, the bending driving device further includes a positioning guide rod. One end of the positioning guide rod is hinged to the outermost layer of heat dissipation plate, and the other end is hinged to the heat pipe limiting block. There are two groups of positioning guide rods, and the two groups of positioning guide rods are symmetrically distributed with respect to the rotation plane of the electric push rod.

[0011] Furthermore, the hot ends and cold ends of the flexible heat pipes adopt rigid structures.

[0012] Furthermore, the connection between the hot end of the flexible heat pipe close to the outermost layer of heat dissipation plate and the flexible connection part is flush with the end face of the heat dissipation plate. The connection between the hot end of the flexible heat pipe far from the outermost layer of heat dissipation plate and the flexible connection part extends out of the heat dissipation plate. Moreover, the farther the flexible heat pipe is from the outermost layer of heat dissipation plate, the longer the distance that the connection between the hot end and the flexible connection part extends out of the heat dissipation plate. Along the direction away from the outermost layer of heat dissipation plate, the distances that the connections between the hot ends of the flexible heat pipes of different layers and the flexible connection part extend out form an arithmetic progression.

[0013] Furthermore, the variation range of the angle between the extending direction of the hot end and the extending direction of the cold end of the flexible heat pipe is 2° to 75°. When the bending angle is 2°, the angle between the hot end and the cold end of the flexible heat pipe approaches the horizontal. When the bending angle of the flexible heat pipe is 2°, its thermal conductivity is the largest and its heat conduction performance is the best; when the bending angle of the flexible heat pipe is 75°, its thermal conductivity is the smallest and its heat conduction performance is the worst. The bending angle of 2° of the flexible heat pipe is taken as the initial installation angle.

[0014] Furthermore, it further includes a temperature sensor and an electric control device. The temperature sensor is used to monitor the temperature information of the space exploration optoelectronic device and output a signal of the temperature information to the electric control device. The electric control device is used to control the telescopic stroke of the electric push rod according to the signal output by the temperature sensor.

[0015] The working process of the dynamic thermal protection device is as follows: When the space optical remote sensing camera is working or directly irradiated by the sun, after the temperature sensor receives a high-temperature signal, it converts the temperature signal into an electrical signal and transmits it to the electronic control device, causing the electric push rod to work in the negative stroke direction, pulling the active rod to rotate clockwise, thereby driving the driven rod to move, and further pushing the heat pipe limit block to drive the flexible variable heat pipe to bend and deform clockwise; When the space optical remote sensing camera stops working or is not directly irradiated by the sun, after the temperature sensor receives a low-temperature signal, it converts the temperature signal into an electrical signal and transmits it to the electronic control device, causing the electric push rod to work in the positive stroke direction, pushing the active rod to rotate counterclockwise, thereby driving the driven rod to move, and further pulling the heat pipe limit block to drive the flexible variable heat pipe to bend and deform counterclockwise.

[0016] Advantages: Compared with the prior art, the significant advantage of the present invention is that due to the bendable characteristics of the flexible variable heat pipe, the thermal conductivity coefficient can be changed according to different deformation angles between the hot end and the cold end of the heat pipe, thereby realizing the adjustment of the heat conduction ability of the heat pipe. Therefore, using the adjustable thermal conductivity coefficient of the flexible variable heat pipe to conduct dynamic thermal protection on the optoelectronic equipment cabin of the space environment exploration satellite will be able to better ensure the normal operation of the detection equipment. When the temperature of the optical remote sensing camera chip is too high, the angle between the hot end and the cold end of the heat pipe deforms to a high thermal conductivity angle to accelerate heat dissipation. When the camera stops working, the angle between the hot and cold ends of the heat pipe deforms to a low thermal conductivity angle to reduce heat dissipation. It has the advantages of compact structure, simple processing and assembly, convenient use, and low cost. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the flexible heat pipe in the dynamic thermal protection device of the present invention at the initial installation angle.

[0018] Figure 2 It is a schematic diagram of the overall structure of the flexible heat pipe in the dynamic thermal protection device of the present invention when it is bent.

[0019] Figure 3 It is a schematic diagram of the relationship curve between the bending angle and the thermal resistance of the flexible heat pipe in the present invention.

[0020] Figure 4 It is a schematic diagram of the overall structure of the flexible heat pipe in the present invention.

[0021] Figure 5 It is a schematic diagram of the staggered arrangement of the flexible heat pipe in different layers of heat dissipation plates of the heat dissipation bracket in the present invention.

[0022] Figure 6 It is a schematic diagram of the extension distance of the hot end of the flexible heat pipe in different layers of heat dissipation plates of the heat dissipation bracket in the present invention.

[0023] Figure 7 This is the driving motion schematic diagram of the bending drive device in the present invention.

[0024] Figure 8 This is the schematic diagram of the working process of the dynamic thermal protection device in the present invention. Specific Embodiments

[0025] As Figure 1 shown, a dynamic thermal protection device for a space exploration optoelectronic device based on a flexible heat pipe in this embodiment includes: a heat dissipation bracket 1, a bending drive device, and a flexible heat pipe 7. The bending drive device includes a driving rod 2, an electric push rod 3, a driven rod 4, a positioning and guiding rod 5, a hinged fixing frame 6, and a heat pipe limiting block 8.

[0026] The hot end and the cold end of the flexible heat pipe 7 are respectively fixed on the heat dissipation bracket 1 and the heat pipe limiting block 8. The hinged fixing frame 6 is directly connected to both the heat dissipation bracket 1 and the heat pipe limiting block 8 by welding. The two ends of the driving rod 2 are respectively connected to the driven rod 4 and the hinged fixing frame 6 in a hinged manner. Similarly, the other end of the driven rod 4 is connected to the hinged fixing frame 6 in a hinged manner. The two ends of the electric push rod 3 are respectively connected to the hinged fixing frame at the 1 / 2 position of the driving rod 1 and the hinged fixing frame 6 in a hinged manner. The two ends of the positioning and guiding rod 5 are both connected to the hinged fixing frame 6 in a hinged manner.

[0027] In the above embodiment, two groups of positioning and guiding rods 5 are arranged and symmetrically distributed with the position of the bending drive device as the axis. The bending drive device mainly includes an electric push rod 3, a driving rod 2, a driven rod 4, and a heat pipe limiting block 8. The position of the bending drive device is distributed on the symmetry axis of the heat dissipation bracket 1. When the electric push rod 3 works, the telescopic rod extends in the working positive stroke direction and shortens in the working negative stroke direction. The dynamic thermal protection device is also provided with a temperature sensor and an electric control device. The temperature sensor is used to detect the heating temperature of the optoelectronic device, convert the temperature signal into an electrical signal, and then transmit it to the electric control device. The electric control device is used to control the extension or contraction of the electric push rod 3.

[0028] To ensure that the flexible heat pipe 7 bends in a preset direction during deformation, the bending deformation section of the heat pipe needs to be processed into a shape that bends in a single direction during processing. And when the thermal conductivity of the flexible heat pipe 7 is the largest, the supplementary angle of the angle between its hot end and cold end is set to 2°. The bending angle change range of the flexible heat pipe 7 is 2° to 75°. When the bending angle of the flexible heat pipe 7 is 2°, the thermal conductivity is the largest and the heat conduction performance is the best; when the bending angle is 75°, the thermal conductivity is the smallest and the heat conduction performance is the worst. As Figure 3 shown, when the bending angle of the flexible heat pipe 7 increases, its thermal resistance increases and the heat conduction ability decreases.

[0029] As Figure 4As shown, both the hot end and the cold end of the flexible heat pipe 7 are made of copper pipes. The flexible connecting part of the middle adiabatic section uses a stainless steel bellows to provide the flexibility required for bending, and the internal wick is a phosphor bronze wire mesh structure.

[0030] The heat dissipation bracket 1 includes a fixing plate, connecting struts and several layers of heat dissipation plates. The connecting struts connect the fixing plate and all the heat dissipation plates. The space exploration optoelectronic device is arranged between the fixing plate and the heat dissipation plates. The several layers of heat dissipation plates are stacked in sequence. The hot end of the flexible heat pipe is fixed between two layers of heat dissipation plates. As Figure 5 shown, to ensure that the flexible heat pipes do not interfere with each other after the flexible heat pipe 7 is bent, the flexible heat pipes 7 in adjacent layers arranged in the heat dissipation bracket 1 are arranged in a staggered manner.

[0031] As Figure 6 shown, to ensure the normal operation of the moving mechanism when the flexible heat pipe 7 is bent and deformed, the end face of the connection between the hot end of the flexible heat pipe 7 near the outermost heat dissipation plate (the uppermost heat dissipation plate in the illustration of this embodiment) and the flexible connecting part is flush with the end face of the heat dissipation plate; as the number of layers decreases downward, the hot end face of the flexible heat pipe 7 extends outward, and the distance between the hot end face and the end face of the heat dissipation plate is fixed in sequence downward at a certain value as an arithmetic progression value.

[0032] As Figure 7 shown, the position of the flexible heat pipe shown by the solid line is the position of each component and mechanism when the thermal conductivity of the flexible heat pipe 7 is the largest and the heat conduction performance is the best. OA represents the electric push rod 3, BC represents the active rod 2, CD represents the driven rod 4, EF represents the positioning guide rod 5, and the bent deformation section of the flexible heat pipe 7 is simplified as a rotating pair G. The lengths of each mechanism and the selection of the stroke of the electric push rod 3 can be determined by the graphical method according to the actual size of the optoelectronic detection device and the kinematic diagram of this mechanism.

[0033] To realize the free control of the bending angle of the flexible heat pipe 7, an electric push rod 3 with a self-locking mechanism is selected. The main self-locking forms are as follows:

[0034] (1) Worm and worm gear transmission form: The worm on the motor gear drives the worm wheel to rotate, so that the small lead screw inside the worm wheel makes an axial movement. The connecting plate drives the limit rod to make an axial movement accordingly. When the required stroke is reached, the travel switch is pressed down by adjusting the limit block to cut off the power supply, and the motor stops running, and vice versa.

[0035] (2) Gear transmission form: The motor drives the small lead screw installed in the inner tube through the reduction gear, drives the nut connected to it to make an axial movement. When the set stroke is reached, the nut antenna presses the limit switch to cut off the power supply, and the motor stops moving, and vice versa.

[0036] The correspondence between the temperature information and the stroke information of the electric push rod 3 needs to be input into the electric control device to ensure that the electric control system accurately controls the extension or contraction stroke of the electric push rod 3 and enables the electric push rod 3 to be self-locked.

[0037] As Figure 8 shown, the specific working process of the dynamic thermal protection device for the optoelectronic equipment cabin of the space environment exploration satellite using the flexible heat pipe in this embodiment is as follows:

[0038] When the space optoelectronic equipment is working or directly irradiated by the sun, after the temperature sensor receives a high-temperature signal, it converts the temperature signal into an electrical signal and transmits it to the electric control device, causing the electric push rod 3 to work in the negative stroke direction, pulling the active rod 2 to rotate clockwise, thereby driving the driven rod 4 to move, and further pushing the heat pipe limit block 8 to drive the flexible heat pipe 7 to bend and deform clockwise. After reaching the required bending angle, the electric push rod 3 is self-locked; on the contrary, when the space optoelectronic equipment stops working or is not directly irradiated by the sun, after the temperature sensor receives a low-temperature signal, it converts the temperature signal into an electrical signal and transmits it to the electric control device, causing the electric push rod 3 to work in the positive stroke direction, pushing the active rod 2 to rotate counterclockwise, thereby driving the driven rod 4 to move, and further pulling the heat pipe limit block 8 to drive the flexible heat pipe 7 to bend and deform counterclockwise. After reaching the required bending angle, the electric push rod 3 is self-locked.

Claims

1. A dynamic thermal protection device for space detection optoelectronic equipment based on a flexible heat pipe, characterized in that: The invention comprises a heat dissipation support (1) arranged outside a space detection optoelectronic device, a bending drive device and a flexible heat pipe (7); the heat dissipation support (1) is used for heat dissipation of the space detection optoelectronic device; the flexible heat pipe (7) comprises a hot end, a cold end and a flexible connection portion; the flexible connection portion connects the hot end and the cold end; the hot end of the flexible heat pipe is fixedly connected to the heat dissipation support (1); the cold end of the flexible heat pipe is connected to the output end of the bending drive device; the bending drive device drives the cold end of the flexible heat pipe to move, thereby deforming the flexible connection portion and changing the thermal conductivity of the flexible heat pipe.

2. The dynamic thermal protection device according to claim 1, characterized in that: The bending drive device comprises an electric push rod (3), a connecting rod and a heat pipe limit block (8); the output end of the electric push rod (3) is hinged to the connecting rod, the connecting rod is hinged to the heat pipe limit block (8), the heat pipe limit block is fixedly connected to the cold end of the flexible heat pipe, and the electric push rod (3) is extended and retracted to drive the heat pipe limit block (8) to move through the connecting rod, thereby driving the cold end of the heat pipe to move.

3. The dynamic thermal protection device according to claim 2, characterized in that: The heat dissipation bracket (1) comprises a fixing plate, a connecting support and a plurality of heat dissipation plates, the connecting support connects the fixing plate and all the heat dissipation plates, the space detection optoelectronic equipment is arranged between the fixing plate and the heat dissipation plate, the plurality of heat dissipation plates are stacked in sequence, and the hot end of the flexible heat pipe is fixed between two layers of heat dissipation plates.

4. The dynamic thermal protection device according to claim 3, characterized in that: A flexible heat pipe is arranged between every two layers of the heat dissipation plates, and the multi-layer heat dissipation plates are fixedly connected with multiple layers of flexible heat pipes, and the flexible heat pipes of adjacent layers are arranged in a staggered manner.

5. The dynamic thermal protection device according to claim 4, characterized in that: The connecting rod comprises an active rod (2) and a driven rod (4) which are hinged to each other, one end of the active rod (2) is hinged to the outermost heat sink, and the other end is hinged to the driven rod (4), the other end of the driven rod is hinged to the heat pipe limit block (8), the fixed end of the electric push rod (3) is hinged to the outermost heat sink, and the output end of the electric push rod (3) is hinged to the rod body of the active rod (2).

6. The dynamic thermal protection device according to claim 5, characterized in that: The bending drive device also includes a positioning guide rod (5), one end of which is hinged to the outermost heat dissipation plate, and the other end is hinged to the heat pipe limit block (8). There are two groups of positioning guide rods, and the two groups of positioning guide rods are distributed in a plane symmetrical to the rotation plane of the electric push rod (3).

7. The dynamic thermal protection device according to claim 6, characterized in that: The connection between the hot end of the flexible heat pipe close to the outermost heat sink and the flexible connecting part is flush with the end surface of the heat sink, and the connection between the hot end of the flexible heat pipe far from the outermost heat sink and the flexible connecting part extends out of the heat sink. The farther the flexible heat pipe is from the outermost heat sink, the longer the distance between the connection between the hot end and the flexible connecting part and the heat sink is. The distances between the connection between the hot ends of the flexible heat pipes in different layers and the flexible connecting parts extending out of the heat sink are in an arithmetic progression along the direction away from the outermost heat sink.

8. The dynamic thermal protection device according to claim 1, characterized in that: The included angle between the hot end extension direction and the cold end extension direction of the flexible heat pipe (7) varies in the range of 2° to 75°.

Images