Miniature refrigerator for infrared detector

Abstract

The miniature refrigerating machine comprises a heat conduction box, a heat exchange box and a heat conduction agent storage tank, a heat conduction oil channel and a piston rod channel are arranged in the heat conduction box, a piston rod is arranged in the piston rod channel, and a plurality of movable plugs are fixedly connected to the piston rod; one surface of the heat conduction box is used for mounting an infrared detector chip, a snakelike heat conduction pipe is arranged in a box body of the heat exchange box, and a plurality of fans are mounted at an air inlet; the heat-conducting agent storage tank is filled with heat-conducting oil, the bottom of the heat-conducting agent storage tank is communicated with the liquid inlet pipe through the liquid inlet hose, and the liquid outlet plug is communicated with the heat-conducting agent storage tank through the liquid return pipe. According to the miniature refrigerating machine for the infrared detector, the infrared detector chip is cooled in a pulse type heat exchange mode, meanwhile, the traditional air cooling effect is achieved, the refrigerating effect of the infrared detector is effectively improved, the power loss of the whole infrared detector is reduced, vibration generated by equipment operation is reduced, and the service life of the infrared detector is prolonged. And long-term stable operation of the infrared detector is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigerators, and particularly relates to a micro-refrigerator for an infrared detector. Background Art

[0002] An infrared detector is a device that converts an incident infrared radiation signal into an electrical signal output. When an infrared detector works, a large amount of heat is generated. If this heat is not dissipated in time, it is easy to cause the temperature of the detector to be too high, even exceeding the working temperature range, which affects the accuracy of the detection data of the infrared detector. An integrated Stirling refrigerator has been applied to a refrigerated infrared detector, improving the working temperature of the infrared detector. However, the Stirling refrigerator not only has a large volume, low refrigeration efficiency, but also generates continuous vibration during operation, which will affect the normal operation of the infrared detector. Summary of the Invention

[0003] To solve the above technical problems, the technical solution adopted by the present invention is: a micro-refrigerator for an infrared detector, including a heat conduction box, a heat exchange box, and a heat conduction agent storage tank.

[0004] A heat conduction oil channel and a piston rod channel are provided in the heat conduction box. The heat conduction oil channel includes a number of pipe segments arranged in sequence. The pipe segments are respectively arranged perpendicular to the piston rod channel. A piston rod is provided in the piston rod channel. One end of the heat conduction box is provided with a movable port for one end of the piston rod to extend out. A liquid inlet pipe and a liquid outlet pipe are provided on one side of the heat conduction box. One end of the pipe segment communicates with the piston rod channel, and the other end communicates with an adjacent pipe segment, the liquid inlet pipe or the liquid outlet pipe. A number of movable plugs are fixedly connected to the piston rod. The movable plugs include alternately arranged tapered plugs and pistons. A number of movable segments are sequentially provided on the piston rod channel. The movable plugs correspond to the movable segments one by one and move in the corresponding movable segments. The two ends of the movable segment are respectively set as plugs. The tapered plug includes a small diameter end and a large diameter end. The diameter of the small diameter end is smaller than the diameter of the plug. The diameter of the large diameter end is larger than the diameter of the plug and smaller than the diameter of the movable segment. The piston makes a piston movement in the corresponding movable segment. The piston rod is driven by a driving mechanism to move in the piston rod channel.

[0005] One side of the heat conduction box is used to install an infrared detector chip. The heat exchange box is located on the other side of the heat conduction box and is spaced from the heat conduction box. An air outlet communicating with the inside of the box body is provided on one side of the heat exchange box, and an air inlet communicating with the inside of the box body is provided on the other side. A serpentine heat conduction pipe is provided inside the box body of the heat exchange box. One end of the serpentine heat conduction pipe communicates with a liquid inlet plug located on the box body, and the other end communicates with a liquid outlet plug located on the box body. The liquid outlet pipe communicates with the liquid inlet plug through a return pipe. A number of fans are installed at the air inlet.

[0006] The heat-conducting agent storage tank is filled with heat-conducting oil. The bottom of the heat-conducting agent storage tank is connected to the liquid inlet pipe through a liquid inlet hose with an oil pump, and the liquid outlet plug is connected to the heat-conducting agent storage tank through a liquid return pipe.

[0007] As a preference of the above technical solution, a spring is provided in the piston rod channel, and the spring presses against the piston rod to keep the conical plug away from the corresponding plugging port.

[0008] As a preference of the above technical solution, the driving mechanism includes a motor, the output shaft of the motor is connected with an eccentric wheel, and one end of the piston rod extends out of the movable port and is in contact with the circumferential surface of the eccentric wheel.

[0009] As a preference of the above technical solution, the piston rod channel includes a sealing plug movable section, a sealing plug is provided in the sealing plug movable section, and the sealing plug is fixedly connected to the piston rod.

[0010] As a preference of the above technical solution, the heat-conducting box is made of a copper block or an aluminum block. The heat-conducting box is divided into an upper box body and a lower box body. The upper box body and the lower box body are connected by a plurality of screws, and a sealing gasket is provided between the upper box body and the lower box body. A part of the heat-conducting oil channel is located in the upper box body, and another part is located in the lower box body. A part of the piston rod channel is located in the upper box body, and another part is located in the lower box body.

[0011] As a preference of the above technical solution, the heat exchange box is located below the heat-conducting box, and the air inlet of the heat exchange box is located between the heat-conducting box and the air outlet.

[0012] As a preference of the above technical solution, the serpentine heat-conducting tube is a copper tube.

[0013] As a preference of the above technical solution, the fan is a variable-frequency fan.

[0014] The beneficial effects of the present invention are as follows: The micro-refrigerator for an infrared detector of the present invention uses a pulse-type heat exchange method to cool the infrared detector chip, and at the same time has the cooling effect of traditional air cooling. It effectively improves the refrigeration effect of the infrared detector, reduces the power loss of the entire infrared detector, reduces the vibration generated during the operation of the equipment, and ensures that the infrared detector can operate stably for a long time. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a schematic cross-sectional structure diagram of the heat-conducting box;

[0017] Figure 3 is a schematic cross-sectional structure diagram of the heat exchange box. Detailed Embodiments

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] As Figures 1-3 shown, the miniature refrigerator for an infrared detector includes a heat conduction box 1, a heat exchange box 2, and a heat conduction agent storage tank.

[0022] The heat-conducting box 1 is provided with a heat-conducting oil channel and a piston rod channel 4. The heat-conducting oil channel includes a number of pipe segments 5 arranged in sequence. The pipe segments 5 are respectively arranged perpendicular to the piston rod channel 4. A piston rod 6 is arranged in the piston rod channel 4. One end of the heat-conducting box 1 is provided with a movable opening 7 for one end of the piston rod 6 to extend out. One side of the heat-conducting box 1 is provided with a liquid inlet pipe 8 and a liquid outlet pipe 9. One end of the pipe segment 5 is communicated with the piston rod channel 4, and the other end is communicated with the adjacent pipe segment 5, the liquid inlet pipe 8 or the liquid outlet pipe 9. A number of movable plugs are fixedly connected to the piston rod 6. The movable plugs include alternately arranged conical plugs 10 and pistons 11. A number of movable segments 12 are sequentially arranged on the piston rod channel 4. The movable plugs correspond to the movable segments 12 one by one and move in the corresponding movable segments 12. Both ends of the movable segment 12 are respectively provided as blocking openings 13. The conical plug 10 includes a small-diameter end 14 and a large-diameter end 15. The diameter of the small-diameter end 14 is smaller than the diameter of the blocking opening 13. The diameter of the large-diameter end 15 is larger than the diameter of the blocking opening 13 and smaller than the diameter of the movable segment 12. The piston 11 moves as a piston 11 in the corresponding movable segment 12. The piston rod 6 is driven by a driving mechanism to move in the piston rod channel 4.

[0023] One side of the heat-conducting box 1 is used to install an infrared detector chip. The heat exchange box 2 is located on the other side of the heat-conducting box 1 and is arranged at an interval from the heat-conducting box 1. One side of the heat exchange box 2 is provided with an air outlet communicating with the inside of the box body, and the other side is provided with an air inlet 17 communicating with the inside of the box body. A serpentine heat-conducting pipe 18 is arranged inside the box body. One end of the serpentine heat-conducting pipe 18 is communicated with a liquid inlet plug 19 located on the box body, and the other end is communicated with a liquid outlet plug 20 located on the box body. The liquid outlet pipe 9 is communicated with the liquid inlet plug 19 through a return pipe. A number of fans 22 are installed at the air inlet 17.

[0024] The heat-conducting agent storage tank is filled with heat-conducting oil. The bottom of the heat-conducting agent storage tank is communicated with the liquid inlet pipe 8 through a liquid inlet hose with an oil pump. The liquid outlet plug 20 is communicated with the heat-conducting agent storage tank through a liquid return pipe. The oil pump makes the heat-conducting oil entering the heat-conducting oil channel have a certain pressure.

[0025] Further, a spring 26 is arranged in the piston rod channel 4. The spring 26 abuts against the piston rod 6 to make the conical plug 10 away from the corresponding blocking opening 13. The spring 26 makes the adjacent pipe segments 5 keep in a communicating state in the natural state, and the heat-conducting oil can smoothly pass through the heat-conducting oil channel under the pressure of the oil pump. When the spring 26 is compressed by force, the conical plug 10 blocks the corresponding blocking opening 13, and every two pipe segments 5 form a communicating state, and the internal heat-conducting oil is stable and immovable, and a sufficient heat exchange is formed with the heat-conducting box 1. After the external force disappears, the heat-conducting oil continues to flow under the action of the oil pressure and the restoring force of the spring 26. In this way, the oil pump does not require a very large power.

[0026] Furthermore, the driving mechanism includes a motor, and the output shaft of the motor is connected with an eccentric wheel 28. One end of the piston rod 6 extends out of the movable port 7 and is in contact with the circumferential surface of the eccentric wheel 28. Through the rotation of the eccentric wheel 28, the piston rod 6 makes periodic and regular reciprocating movements, causing the heat transfer oil to make low-frequency pulsed movements in the heat transfer oil channel, improving the heat exchange efficiency while reducing vibration and minimizing the impact on the infrared detector chip.

[0027] Furthermore, the piston rod channel 4 includes a sealing plug movable section 27. The movable port 7 communicates with the sealing plug movable section 27. A sealing plug 29 is arranged in the sealing plug movable section 27, and the sealing plug 29 is fixedly connected to the piston rod 6. The sealing plug 29 moves within the sealing plug movable section 27 to prevent the heat transfer oil from leaking from the movable port 7.

[0028] Furthermore, the heat conduction box 1 is made of a copper block or an aluminum block. The heat conduction box 1 is divided into an upper box body 30 and a lower box body 31. The upper box body 30 and the lower box body 31 are connected by a plurality of screws, and a sealing gasket is arranged between the upper box body 30 and the lower box body 31. A part of the heat transfer oil channel is located in the upper box body 30, and another part is located in the lower box body 31. A part of the piston rod channel 4 is located in the upper box body 30, and another part is located in the lower box body 31. The heat conduction box 1 being divided into the upper box body 30 and the lower box body 31 facilitates the processing and forming of the heat transfer oil channel and the piston rod channel 4 inside the heat conduction box 1.

[0029] Furthermore, the heat exchange box 2 is located below the heat conduction box 1, and the air inlet 17 of the heat exchange box 2 is located between the heat conduction box 1 and the air outlet. The fan 22 is installed at the air outlet, and by exhausting air outward, the high-temperature air inside the heat conduction box 1 is sucked away. The low-temperature air enters the air inlet 17 from the gap between the heat exchange box 2 and the heat conduction box 1, exchanges heat with the serpentine heat conduction pipe 18, and then is discharged from the air outlet. In this way, the heat conduction box 1 can also dissipate heat directly under the condition of being less affected by small air flow. The heat exchange box 2 and the heat conduction box 1 do not directly contact each other, reducing the impact of the vibration of the serpentine heat conduction pipe 18 on the heat conduction box 1 and the infrared detector chip.

[0030] Furthermore, the serpentine heat conduction pipe 18 is a copper pipe. The copper pipe has good heat conduction effect and high heat exchange efficiency.

[0031] Furthermore, the fan 22 is a variable-frequency fan 22. The variable-frequency fan 22 has good energy-saving effect and good sound insulation effect, and can further reduce the vibration generated during the operation of the fan.

[0032] It is worth mentioning that the technical features such as the motor and the oil pump involved in this invention patent application should be regarded as prior art. For the specific structures, working principles, and possible control methods and spatial arrangement methods of these technical features, conventional selections in the art can be adopted, and they should not be regarded as the inventive points of this invention patent. This invention patent will not be further specifically elaborated.

[0033] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. Miniature refrigerator for infrared detector, characterized in that, It includes a heat conduction box, a heat exchange box, and a heat conduction agent storage tank. Inside the heat conduction box, there are a heat conduction oil channel and a piston rod channel. The heat conduction oil channel includes several pipe segments arranged in sequence. The pipe segments are respectively arranged perpendicular to the piston rod channel. Inside the piston rod channel, there is a piston rod. One end of the heat conduction box is provided with a movable opening for one end of the piston rod to extend out. One side of the heat conduction box is provided with a liquid inlet pipe and a liquid outlet pipe. One end of the pipe segment is connected to the piston rod channel, and the other end is connected to the adjacent pipe segment, the liquid inlet pipe, or the liquid outlet pipe. A number of movable plugs are fixedly connected to the piston rod. The movable plugs include alternately arranged conical plugs and pistons. A number of movable segments are sequentially arranged on the piston rod channel. The movable plugs correspond to the movable segments one by one and move in the corresponding movable segments. The two ends of the movable segment are respectively set as blocking ports. The conical plug includes a small diameter end and a large diameter end. The diameter of the small diameter end is smaller than the diameter of the blocking port. The diameter of the large diameter end is larger than the diameter of the blocking port and smaller than the diameter of the movable segment. The piston makes a piston movement in the corresponding movable segment. The piston rod is driven by a driving mechanism to move in the piston rod channel. One side of the heat conduction box is used to install an infrared detector chip. The heat exchange box is located on the other side of the heat conduction box and is spaced from the heat conduction box. One side of the heat exchange box is provided with an air outlet communicating with the inside of the box body, and the other side is provided with an air inlet communicating with the inside of the box body. Inside the box body of the heat exchange box, there is a serpentine heat conduction pipe. One end of the serpentine heat conduction pipe is connected to a liquid inlet plug located on the box body, and the other end is connected to a liquid outlet plug located on the box body. The liquid outlet pipe is connected to the liquid inlet plug through a return pipe. A number of fans are installed at the air inlet. The heat conduction agent storage tank is filled with heat conduction oil. The bottom of the heat conduction agent storage tank is connected to the liquid inlet pipe through a liquid inlet hose with an oil pump. The liquid outlet plug is connected to the heat conduction agent storage tank through a return liquid pipe.

2. The micro-refrigerator for an infrared detector according to claim 1, characterized in that, A spring is arranged inside the piston rod channel. The spring presses against the piston rod to make the conical plug away from the corresponding blocking port.

3. The micro-refrigerator for an infrared detector according to claim 2, characterized in that, The driving mechanism includes a motor. The output shaft of the motor is connected with an eccentric wheel. One end of the piston rod extends out of the movable opening and is in contact with the circumferential surface of the eccentric wheel.

4. The micro-refrigerator for an infrared detector according to claim 1, wherein, The piston rod channel includes a sealing plug movable segment. Inside the sealing plug movable segment, there is a sealing plug. The sealing plug is fixedly connected to the piston rod.

5. The micro-refrigerator for an infrared detector according to claim 1, wherein The heat conduction box is made of a copper block or an aluminum block. The heat conduction box is divided into an upper box body and a lower box body. The upper box body and the lower box body are connected by several screws. A sealing gasket is arranged between the upper box body and the lower box body. A part of the heat conduction oil channel is located in the upper box body, and the other part is located in the lower box body. A part of the piston rod channel is located in the upper box body, and the other part is located in the lower box body.

6. The micro-refrigerator for an infrared detector according to claim 1, wherein The heat exchange box is located below the heat conduction box. The air inlet of the heat exchange box is located between the heat conduction box and the air outlet.

7. The micro-refrigerator for an infrared detector according to claim 6, characterized in that, The serpentine heat conduction pipe is a copper pipe.

8. The micro-refrigerator for an infrared detector according to claim 7, characterized in that, The fan is a variable frequency fan.

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