CN111399320B - CCD camera refrigerating device based on thermoelectric refrigeration - Google Patents
CCD camera refrigerating device based on thermoelectric refrigeration Download PDFInfo
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- CN111399320B CN111399320B CN202010235597.3A CN202010235597A CN111399320B CN 111399320 B CN111399320 B CN 111399320B CN 202010235597 A CN202010235597 A CN 202010235597A CN 111399320 B CN111399320 B CN 111399320B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
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Abstract
A CCD camera refrigerating device based on thermoelectric refrigeration relates to a camera refrigerating device. The invention solves the problems that the prior thermoelectric refrigerating device has poor heat dissipation at the hot end, and the refrigeration at the cold end reaches the subzero temperature and is easy to dewe. The hot end of the thermoelectric refrigeration piece is tightly attached to the cavity structure of the water cooling plate, the other end of the CCD signal adapter plate passes through the interlayer of the water cooling plate and is positioned outside the water cooling plate, the water cooling plate and the CCD signal adapter plate are sealed by epoxy gum, the lower end of the water cooling plate is sealed by welding a water cooling cover plate, and the refrigeration cavity is filled with nitrogen or is vacuumized; the heat pipe seat is provided with a plurality of heat pipe concave channels, the upper parts of the heat pipes are arranged in the corresponding heat pipe concave channels, the fans are arranged on the side walls of the radiating fins, and the lower parts of the heat pipes penetrate out of the radiating fins; the main control board is installed in camera refrigeration casing and with drive circuit board parallel arrangement, drive circuit board passes through the contact pin and is connected with the main control board electricity. The invention is used for refrigerating the CCD camera.
Description
Technical Field
The invention relates to a camera refrigerating device, in particular to a CCD camera refrigerating device based on thermoelectric refrigeration, and belongs to the technical field of photoelectric detection.
Background
A CCD (charge coupled device) is an image sensor that converts an optical signal into an electrical signal, and is widely used in the field of photodetection. The CCD has high sensitivity, but because the existing dark current is particularly sensitive to temperature, the dark current is larger at higher temperature, so that the noise of the dark current is larger, and therefore, in order to improve the signal-to-noise ratio of an optical signal, the working temperature of the CCD is effectively reduced to reduce the dark current, and the dark current is reduced by half every 5-7 ℃ generally.
At present, CCD refrigeration mainly comprises thermoelectric refrigeration (TEC), liquid nitrogen refrigeration and heat engine refrigeration. Thermoelectric refrigeration utilizes electric energy to refrigerate, and is small in size, high in refrigeration efficiency, easy to control and long in service life, and most international products adopt thermoelectric refrigeration technology to refrigerate at present. And because thermoelectric refrigeration can generate a large amount of heat at the hot end of the thermoelectric refrigeration, the thermoelectric refrigeration is particularly important for the heat dissipation design of the hot end of the TEC and the adaptability of the heat dissipation mode of the hot end to different conditions. The cold end of the TEC is refrigerated to reach the subzero temperature, and is easy to condense, so the design of the refrigerating cavity is also important, and in addition, the TEC also relates to a signal output device.
In conclusion, the heat dissipation performance of the hot end of the existing thermoelectric refrigerating device is poor, and the refrigeration of the cold end reaches the subzero temperature and is easy to form dew.
Disclosure of Invention
The invention provides a CCD camera refrigerating device based on thermoelectric refrigeration, aiming at solving the problems that the heat dissipation of a hot end of the existing thermoelectric refrigerating device is poor, the refrigeration of a cold end reaches subzero temperature and is easy to dewe.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the CCD camera refrigerating device based on thermoelectric refrigeration comprises a camera refrigerating shell, a refrigerating sealing system, an air cooling structure and a signal output device, wherein the refrigerating sealing system, the air cooling structure and the signal output device are all arranged in the camera refrigerating shell, the refrigerating sealing system comprises a refrigerating cavity 5 and a water cooling plate 11, an optical window 4 is arranged in the center of the upper end of the refrigerating cavity 5, the refrigerating sealing system also comprises a CCD signal adapter plate 7, a temperature sensor 12, a thermoelectric refrigerating sheet 10 and a water cooling cover plate 16, the CCD camera 6 is attached to the cold end of the thermoelectric refrigerating sheet 10, the upper end surface of the water cooling plate 11 is a concave cavity structure 11-1, a plurality of flow passages 11-2 are processed on the water cooling plate 11 and are mutually communicated, the inlet and the outlet of the flow passage 11-2 are both connected with a water cooling connector 15, the hot end of the thermoelectric refrigerating sheet 10 is tightly attached to the concave cavity structure 11-1 of the water cooling plate 11, a heat-conducting silica gel layer is coated between the hot end of the thermoelectric refrigerating chip 10 and the water cooling plate 11, the CCD camera 6 is connected with one end of the CCD signal adapter plate 7 in an inserting manner, the other end of the CCD signal adapter plate 7 penetrates through the interlayer of the water cooling plate 11 and is positioned outside the water cooling plate 11, the water cooling plate 11 and the CCD signal adapter plate 7 are sealed by epoxy resin, a temperature sensor 12 is arranged on the water cooling plate 11, the lower end of the water cooling plate 11 is sealed by welding a water cooling cover plate 16, and the refrigerating cavity 5 is filled with nitrogen or is vacuumized;
the air cooling structure comprises a heat pipe seat 17, a heat dissipation fin 19, a fan 20 and a plurality of heat pipes 18, wherein the heat pipe seat 17 is arranged on the lower end face of the water cooling cover plate 16, a plurality of heat pipe concave channels are processed on the heat pipe seat 17, the number of the heat pipes 18 is in one-to-one correspondence with the heat pipe concave channels, the upper parts of the heat pipes 18 are arranged in the corresponding heat pipe concave channels, the heat dissipation fin 19 is positioned below the heat pipe seat 17, the fan 20 is arranged on the side wall of the heat dissipation fin 19, and the lower parts of the heat pipes 18 penetrate out of the heat dissipation fin 19;
the signal output device comprises a main control board 21, a contact pin 22, a driving circuit board 23, a driving circuit heat dissipation plate 24 and a communication and power interface 25, the driving circuit heat dissipation plate 24 is welded on the side wall of the heat dissipation fin 19, the driving circuit board 23 is installed on the driving circuit heat dissipation plate 24, the main control board 21 is installed in the camera refrigeration shell and is arranged in parallel with the driving circuit board 23, the driving circuit board 23 is electrically connected with the main control board 21 through the contact pin 22, and the communication transmission and power interface 25 is located at the lower part of the main control board 21.
In one embodiment, the camera refrigeration shell comprises a packaging cylinder body 1, a bottom plate 2 and an upper cover 3, wherein the upper cover 3 is installed on the upper end face of the packaging cylinder body 1 through bolts, the bottom plate 2 is installed on the lower end face of the packaging cylinder body 1, and an optical window 4 is processed in the center of the upper cover 3.
In one embodiment, the optical window 4 is sealed with an epoxy resin.
In one embodiment, the thermoelectric cooling fins 10 are four-stage thermoelectric cooling fins.
In one embodiment, pins 22 are right angle pins.
In one embodiment, a through hole is processed on the side wall of the refrigeration cavity 5, the upper end of the copper bending pipe 13 is welded at the through hole of the side wall of the refrigeration cavity 5, the copper bending pipe 13 is communicated with the refrigeration cavity 5, and a switch valve 14 is arranged on the copper bending pipe 13.
In one embodiment, the plurality of flow channels 11-2 are arranged in parallel and at equal intervals, the plurality of flow channels 11-2 are arranged in a way of being communicated with each other end to end, and the inlet and the outlet of the flow channel 11-2 are positioned on the same side wall of the water cooling plate 11.
In one embodiment, the water cooled fitting 15 is a water cooled fitting that is imperial sealed pipe threads.
In one embodiment, several heat pipe channels are arranged in parallel and equidistant with the heat pipes 18 arranged flush with the end face of the heat pipe seat 17.
In one embodiment, the refrigeration sealing system further comprises an O-shaped sealing ring 9, and the lower end of the refrigeration cavity 5 is connected with the water cooling plate 11 in a sealing mode through the O-shaped sealing ring 9.
Compared with the prior art, the invention has the following beneficial effects:
according to the thermoelectric refrigeration-based CCD camera refrigeration device, the CCD driving circuit and the TEC driving circuit are both arranged in the camera refrigeration shell, and the heat pipe sharing heat dissipation mode is adopted by adopting a unique layout, so that not only can the heat of the TEC be well dissipated, but also the driving circuit can be well dissipated; compared with the existing CCD camera or a mode of externally arranging a circuit, the CCD camera has low noise and strong signal output capability; compared with the existing camera system in which the circuit is arranged, the heat generation is small, and the heat dissipation is convenient;
the thermoelectric refrigeration-based CCD camera refrigerating device has the advantages that the whole structure is simple and compact on the premise of ensuring the sealing performance, the signal output capacity is greatly improved, and the signal output is ensured not to be distorted; the water cooling mode and the heat pipe air cooling mode are designed simultaneously, the selection modes in different environments are provided on the premise of ensuring the heat dissipation requirement, and the cold end refrigeration is not easy to dewing when reaching the subzero temperature under the guarantee of the heat dissipation capacity, so that the refrigeration effect is better.
Drawings
FIG. 1 is a perspective view of the overall structure of a thermoelectric refrigeration-based CCD camera refrigeration device of the present invention;
FIG. 2 is a perspective view of a refrigeration sealing system according to one embodiment of the present invention;
FIG. 3 is a front cross-sectional view of a refrigeration sealing system in accordance with one embodiment of the present invention;
FIG. 4 is a perspective view of an air-cooled structure according to an embodiment of the present invention;
FIG. 5 is a front view of a signal output device according to a first embodiment of the present invention;
wherein: the device comprises a packaging barrel 1, a bottom plate 2, an upper cover 3, an optical window 4, a refrigeration cavity 5, a CCD camera 6, a CCD signal adapter plate 7, a pin 8, an O-shaped sealing ring 9, a thermoelectric refrigeration sheet 10, a water cooling plate 11, a temperature sensor 12, a copper bend 13, a switch valve 14, a water cooling joint 15, a water cooling cover plate 16, a heat pipe seat 17, a heat pipe 18, a heat dissipation fin 19, a fan 20, a main control plate 21, a pin 22, a driving circuit board 23, a driving circuit heat dissipation plate 24 and a communication transmission and power interface 25.
Detailed Description
The first embodiment is as follows: as shown in fig. 1 to 5, the CCD camera refrigeration device based on thermoelectric refrigeration of the present embodiment includes a camera refrigeration housing, a refrigeration sealing system, an air cooling structure and a signal output device, wherein the refrigeration sealing system, the air cooling structure and the signal output device are all disposed in the camera refrigeration housing,
the refrigeration sealing system comprises a refrigeration cavity 5 and a water cooling plate 11, an optical window 4 is arranged at the center of the upper end of the refrigeration cavity 5, the refrigeration sealing system also comprises a CCD signal adapter plate 7, a temperature sensor 12, a thermoelectric refrigeration sheet 10 and a water cooling cover plate 16, a CCD camera 6 is attached to the cold end of the thermoelectric refrigeration sheet 10, the upper end surface of the water cooling plate 11 is a concave cavity structure 11-1, a plurality of runners 11-2 are processed on the water cooling plate 11, the runners 11-2 are communicated with each other, the inlet and the outlet of the runner 11-2 are both connected with a water cooling joint 15, the hot end of the thermoelectric refrigeration sheet 10 is tightly attached to the concave cavity structure 11-1 of the water cooling plate 11, a heat-conducting silica gel layer is coated between the hot end of the thermoelectric refrigeration sheet 10 and the water cooling plate 11, the CCD camera 6 is connected with one end of the CCD signal adapter plate 7 in an inserting manner, the other end of the CCD signal adapter plate 7 penetrates through the interlayer of the cooling plate 11 and is positioned outside the water cooling plate 11, the water cooling plate 11 and the CCD signal adapter plate 7 are sealed by epoxy resin, a temperature sensor 12 is arranged on the water cooling plate 11, the lower end of the water cooling plate 11 is sealed by welding a water cooling cover plate 16, and the refrigeration cavity 5 is filled with nitrogen or vacuumized;
the air cooling structure comprises a heat pipe seat 17, a heat dissipation fin 19, a fan 20 and a plurality of heat pipes 18, wherein the heat pipe seat 17 is arranged on the lower end face of the water cooling cover plate 16, a plurality of heat pipe concave channels are processed on the heat pipe seat 17, the number of the heat pipes 18 is in one-to-one correspondence with the heat pipe concave channels, the upper parts of the heat pipes 18 are arranged in the corresponding heat pipe concave channels, the heat dissipation fin 19 is positioned below the heat pipe seat 17, the fan 20 is arranged on the side wall of the heat dissipation fin 19, and the lower parts of the heat pipes 18 penetrate out of the heat dissipation fin 19;
the signal output device comprises a main control board 21, a contact pin 22, a driving circuit board 23, a driving circuit heat dissipation plate 24 and a communication transmission and power interface 25, the driving circuit heat dissipation plate 24 is welded on the side wall of the heat dissipation fin 19, the driving circuit board 23 is installed on the driving circuit heat dissipation plate 24, the main control board 21 is installed in the camera refrigeration shell and is arranged in parallel with the driving circuit board 23, the driving circuit board 23 is electrically connected with the main control board 21 through the contact pin 22, and the communication and power interface 25 is located at the lower part of the main control board 21.
The second embodiment is as follows: as shown in fig. 1 and 2, the camera refrigeration housing of the present embodiment includes a packaging cylinder 1, a bottom plate 2 and an upper cover 3, the upper cover 3 is mounted on an upper end surface of the packaging cylinder 1 through bolts, the bottom plate 2 is mounted on a lower end surface of the packaging cylinder 1, and an optical window 4 is processed in a center of the upper cover 3.
So design, the outside encapsulation of whole CCD camera refrigerating plant is realized to encapsulation barrel 1, bottom plate 2 and upper cover 3. Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: as shown in fig. 1 and 2, the optical window 4 of the present embodiment is sealed with an epoxy resin.
So design, because the inside refrigeration temperature of refrigeration cavity 5 reaches the negative temperature, consequently must carry out sealed design to the refrigeration chamber, and inside steam discharges into nitrogen gas or evacuation to refrigeration cavity 5 simultaneously, prevents that steam from destroying CCD camera normal work because low temperature liquefaction, and TEC refrigeration effect is better under the vacuum environment simultaneously. Other components and connection relationships are the same as those in the first or second embodiment.
The fourth concrete implementation mode: as shown in fig. 2, the thermoelectric cooling fins 10 of the present embodiment are four-stage thermoelectric cooling fins.
So design produces the refrigeration through the electric current, hugs closely the CCD camera in the cold junction of thermoelectric refrigeration piece 10 to the hot junction of thermoelectric refrigeration piece 10 is hugged closely in the cavity that water-cooling plate 11 set up, and scribbles on its contact surface with heat conduction silica gel increase heat transfer coefficient, and the cold junction refrigeration reaches subzero temperature and also does not condense. Other components and connection relationships are the same as those in the third embodiment.
The fifth concrete implementation mode: as shown in fig. 5, the pin 22 of the present embodiment is a right angle pin.
So design, dirctly to inserting through right angle contact pin and main control board 21 for drive circuit board 23, this mode heat pipe radiator can not only carry out good heat dissipation to the hot junction of thermoelectric refrigeration piece 10, can also carry out good heat dissipation to the drive circuit of thermoelectric refrigeration piece 10. The other components and the connection relations are the same as those of the first, second or fourth embodiment.
The sixth specific implementation mode: as shown in fig. 1 and 2, a through hole is formed in the side wall of the refrigeration cavity 5 in the present embodiment, the upper end of the copper bending pipe 13 is welded at the through hole of the side wall of the refrigeration cavity 5, the copper bending pipe 13 and the refrigeration cavity 5 are communicated with each other, and the copper bending pipe 13 is provided with a switch valve 14.
By the design, the refrigeration cavity 5 is conveniently vacuumized or filled with nitrogen, a through hole is formed in the side face of the refrigeration cavity 5, the bent copper pipe 13 is welded on the through hole, and the switch valve 14 is welded below the bent copper pipe 13, so that the refrigeration cavity 5 is vacuumized and sealed. The other components and the connection relationship are the same as those in the fifth embodiment.
The seventh embodiment: as shown in fig. 2 and fig. 3, in this embodiment, a plurality of flow channels 11-2 are parallel to each other and are arranged at equal intervals, the plurality of flow channels 11-2 are communicated with each other end to end, and an inlet and an outlet of the flow channel 11-2 are located on the same side wall of the water cooling plate 11.
So design, this embodiment adopts series connection runner head and the tail intercommunication setting, and this runner can be according to actual demand in order to satisfy 11 heat dissipation requirements of water-cooling plate. Other components and connections are the same as in the first, second, fourth or sixth embodiments.
The specific implementation mode is eight: as shown in fig. 2 and 4, the water-cooled joint 15 of the present embodiment is a water-cooled joint of a threaded english seal pipe.
By the design, the water-cooling joint with the British system sealing pipe thread is adopted in the embodiment to ensure the sealing performance of the refrigeration cavity 5 and prevent the leakage phenomenon of the refrigeration cavity 5. Other components and connection relationships are the same as those in the seventh embodiment.
The specific implementation method nine: as shown in fig. 1 and 4, in the present embodiment, a plurality of heat pipe recessed channels are arranged in parallel and at equal intervals, and the heat pipes 18 are arranged flush with the end surface of the heat pipe base 17.
By such design, the heat pipe 18 and the end surface of the heat pipe seat 17 are arranged in parallel and level, so that the contact area between the heat pipe 18 and the water-cooling cover plate 16 is increased, and the heat dissipation capability is better. Other components and connection relationships are the same as those in the first, second, fourth, sixth or eighth embodiments.
The detailed implementation mode is ten: as shown in fig. 1, 2 and 3, the refrigeration sealing system of the present embodiment further includes an O-ring 9, and the lower end of the refrigeration cavity 5 is hermetically connected to the water cooling plate 11 through the O-ring 9.
By the design, the refrigeration cavity 5 and the water cooling plate 11 can be connected in a sealing mode, and therefore the sealing performance of the refrigeration cavity 5 is guaranteed. The other components and the connection relationship are the same as those in the ninth embodiment.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.
The working principle is as follows:
in order to reduce the dark current noise of the CCD camera 6, the CCD camera 6 needs to be refrigerated, the invention adopts the thermoelectric refrigerating sheet 10 for refrigeration, which is a device for generating refrigeration through current, so that the CCD camera 6 is tightly attached to the cold end of the thermoelectric refrigerating sheet 10, meanwhile, the hot end of the thermoelectric refrigerating sheet 10 is tightly attached to the concave cavity structure 11-1 of the water cooling plate 11, and the contact surface of the thermoelectric refrigerating sheet 10 and the water cooling plate 11 is coated with heat-conducting silica gel, thereby increasing the heat transfer coefficients of the thermoelectric refrigerating sheet 10 and the water cooling plate 11;
secondly, the CCD camera 6 is inserted on the CCD signal adapter plate 7, the CCD signal adapter plate 7 is led to the outside of the adapter plate 7 through the interlayer of the water cooling plate 11, and epoxy gum is coated on the outer end faces of the water cooling plate 11 and the CCD signal adapter plate 7 for sealing; meanwhile, the optical window 4 above the CCD camera 6 is sealed with epoxy resin;
in addition, because the internal refrigeration temperature of the refrigeration cavity 5 reaches negative temperature, the refrigeration cavity 5 needs to be sealed, water vapor in the refrigeration cavity 5 is discharged, nitrogen is filled into the refrigeration cavity 5 or vacuum pumping is carried out, the water vapor is prevented from damaging the normal work of the CCD camera 6 due to low-temperature liquefaction, and meanwhile, the thermoelectric refrigeration chip 10 has better refrigeration effect in a vacuum environment; in order to vacuumize or fill nitrogen into the refrigeration cavity 5, a through hole is formed in the side face of the refrigeration cavity 5, the bent copper pipe 13 is welded at the through hole of the refrigeration cavity 5, and a switch valve 14 is welded below the bent copper pipe 13, so that the refrigeration cavity 5 is vacuumized and sealed.
The heat dissipation device mainly comprises a water cooling system and an air cooling system:
the water cooling plate 11 is designed into a concave cavity structure 11-1 and is used as the bottom of the refrigeration cavity 5 at the same time, the thermoelectric refrigeration piece 10 is arranged in the concave cavity structure 11-1, a plurality of runners 11-2 are processed on the water cooling plate 11, water cooling circulation is realized through the runners 11-2 and a runner inlet-outlet interface, the runners 11-2 can be designed according to actual requirements to meet heat dissipation requirements, the runners 11-2 adopt series runners, and the concave cavity structure 11-1 can enable heat generated by the thermoelectric refrigeration piece 10 to be efficiently transferred and take away heat through water circulation; the lower end of the water cooling plate 11 is sealed by welding a water cooling cover plate 16, and the inlet and outlet interfaces of the flow channel 11-2 adopt water cooling joints 15 with imperial sealing pipe threads, so that the sealing performance of a water cooling system is ensured, and the liquid leakage phenomenon is prevented; when the refrigeration sealing system starts to work, the external water-cooling circulation system carries out water circulation through the water-cooling joint 15, the runner 11-2 has good heat transfer coefficient and lower pressure drop, and high heat generated by the thermoelectric refrigerating sheet 10 in the concave cavity structure 11-1 is directly taken away;
secondly, the air cooling structure adopts the combination of the heat pipe 18 and the fan 20 to carry out high-efficiency heat dissipation, the heat pipe seat 17 is arranged below the water cooling cover plate 16 and is tightly connected through threads, and heat-conducting silica gel is coated on the contact surface of the heat pipe seat, so that the interface is well contacted, and the heat-conducting structure has good heat conductivity; the heat pipe 18 is welded in the concave channel of the heat pipe seat 17 and is flush with the end surface of the heat pipe seat 17, so that the contact area of the heat pipe 18 and the water-cooling cover plate 16 is increased, and the heat dissipation capability is better; meanwhile, the additional fan 20 forces air cooling to dissipate heat, and takes away heat transferred to the heat pipe 18 and the heat dissipation fins 19;
in the actual use process, a water cooling mode or an air cooling mode can be selected according to requirements, such as the heat quantity generated by the hot end of the thermoelectric refrigerating sheet 10 and the ambient temperature, and the temperature is detected by the temperature sensor 12 and the current and voltage are adjusted to output a proper temperature range, so that the thermoelectric refrigerating sheet has better adaptability to different environments;
in the traditional sealed cavity 5, the connection of signals inside and outside the sealed cavity is usually realized by adopting an aviation connector, but the signal output has great interference because the cable transmission is easy to bring noise, in the invention, the CCD signal adapter plate 7 is directly butted with the main control plate 21 by adopting the right-angle contact pin 8, the transmission distance is extremely short, the undistorted signal output capability is greatly improved, and the sealing performance of the sealed cavity is ensured;
the traditional CCD camera adopts a mode of externally arranging a circuit, however, the mode brings about larger noise, so that the signal output capability is poorer, or the circuit is arranged in a camera system, and as the TEC driving circuit needs larger direct-current voltage and current, an MOS tube generates larger heat, so that the larger heat is caused, and the heat dissipation is difficult; the main control board 21 and the driving circuit board 23 are arranged in the refrigeration system, the integrated CCD camera can be integrated, the external transmission distance is saved, in the heat dissipation problem of the driving circuit board 23, a unique layout is adopted, the driving circuit heat dissipation board 24 is welded on the heat dissipation fins 19 at the bottom end of the heat pipe radiator in a heat dissipation mode shared by the heat pipes 18, then the driving circuit board 23 is fixed on the driving circuit heat dissipation board 24, heat is taken away through the heat dissipation fins 19 at the bottom and the heat pipes 18, meanwhile, the driving circuit board 23 is directly inserted into the main control board 21 through the contact pins 22, and the heat pipe radiator in the connection mode can perform good heat dissipation on the hot end of the thermoelectric refrigeration piece 10 and also perform good heat dissipation on the driving circuit of the thermoelectric refrigeration piece 10;
and finally, the communication transmission and power supply interface 25 supplies power and controls the camera, and the communication transmission and power supply interface 25 is fixed at the bottom end of the main control board 21 and is reserved with an interface through the bottom board 2.
On the premise of ensuring the sealing performance, the invention has simple and compact whole structure, greatly improves the output capacity of signals, ensures that the output of the signals is not distorted, simultaneously designs two heat dissipation modes of water cooling and heat pipe air cooling, provides selection modes under different environments on the premise of ensuring the heat dissipation requirement, and has better refrigeration effect under the premise of ensuring the heat dissipation capacity.
Claims (9)
1. The utility model provides a CCD camera refrigerating plant based on thermoelectric refrigeration, CCD camera refrigerating plant includes camera refrigeration casing, refrigeration sealing system, forced air cooling structure and signal output device, and refrigeration sealing system, forced air cooling structure and signal output device all set up in camera refrigeration casing its characterized in that:
the refrigeration sealing system comprises a refrigeration cavity (5) and a water cooling plate (11), an optical window (4) is arranged at the center of the upper end of the refrigeration cavity (5), the refrigeration sealing system further comprises a CCD signal adapter plate (7), a temperature sensor (12), a thermoelectric refrigeration sheet (10) and a water cooling cover plate (16), a CCD camera (6) is attached to the cold end of the thermoelectric refrigeration sheet (10), the upper end face of the water cooling plate (11) is a concave cavity structure (11-1), a plurality of runners (11-2) are processed on the water cooling plate (11), the runners (11-2) are communicated with one another, an inlet and an outlet of the runner (11-2) are connected with a water cooling connector (15), the hot end of the thermoelectric refrigeration sheet (10) is tightly attached to the concave cavity structure (11-1) of the water cooling plate (11), and a silica gel layer is coated between the hot end of the thermoelectric refrigeration sheet (10) and the water cooling plate (11), the CCD camera (6) is connected with one end of a CCD signal adapter plate (7) in an inserting mode, the other end of the CCD signal adapter plate (7) penetrates through an interlayer of a water cooling plate (11) and is located outside the water cooling plate (11), the water cooling plate (11) and the CCD signal adapter plate (7) are sealed through epoxy gum, a temperature sensor (12) is arranged on the water cooling plate (11), the lower end of the water cooling plate (11) is sealed through a welded water cooling cover plate (16), and nitrogen gas or vacuum pumping treatment is filled in the refrigerating cavity (5);
the air cooling structure comprises a heat pipe seat (17), heat dissipation fins (19), a fan (20) and a plurality of heat pipes (18), wherein the heat pipe seat (17) is installed on the lower end face of a water cooling cover plate (16), a plurality of heat pipe concave channels are processed on the heat pipe seat (17), the number of the heat pipes (18) and the number of the heat pipe concave channels are arranged in a one-to-one correspondence mode, the upper portions of the heat pipes (18) are installed in the corresponding heat pipe concave channels, the heat dissipation fins (19) are located below the heat pipe seat (17), the fan (20) is installed on the side walls of the heat dissipation fins (19), and the lower portions of the heat pipes (18) penetrate through the heat dissipation fins (19);
the signal output device comprises a main control board (21), a contact pin (22), a driving circuit board (23), a driving circuit heat dissipation plate (24) and a communication transmission and power interface (25), the driving circuit heat dissipation plate (24) is welded on the side wall of the heat dissipation fin (19), the driving circuit board (23) is installed on the driving circuit heat dissipation plate (24), the main control board (21) is installed in the camera refrigeration shell and is arranged in parallel with the driving circuit board (23), the driving circuit board (23) is electrically connected with the main control board (21) through the contact pin (22), and the communication and power interface (25) is located at the lower part of the main control board (21);
the camera refrigeration shell comprises a packaging barrel body (1), a bottom plate (2) and an upper cover (3), wherein the upper cover (3) is installed on the upper end face of the packaging barrel body (1) through a bolt, the bottom plate (2) is installed on the lower end face of the packaging barrel body (1), and an optical window (4) is processed in the center of the upper cover (3).
2. The CCD camera cooling device based on thermoelectric cooling of claim 1, wherein: the optical window (4) is sealed by epoxy resin.
3. The CCD camera cooling device based on thermoelectric cooling of claim 2, wherein: the thermoelectric refrigerating piece (10) is a four-stage thermoelectric refrigerating piece.
4. A CCD camera cooling device based on thermoelectric cooling according to claim 1, 2 or 3, characterized in that: the pins (22) are right angle pins.
5. The thermoelectric refrigeration based CCD camera refrigeration device of claim 4, wherein: a through hole is processed on the side wall of the refrigeration cavity (5), the upper end of the bent copper pipe (13) is welded at the through hole of the side wall of the refrigeration cavity (5), the bent copper pipe (13) and the refrigeration cavity (5) are communicated with each other, and a switch valve (14) is arranged on the bent copper pipe (13).
6. The CCD camera cooling device based on thermoelectric cooling of claim 1, 2, 3 or 5, wherein: the plurality of flow channels (11-2) are arranged in parallel and at equal intervals, the plurality of flow channels (11-2) are communicated with each other end to end, and the inlet and the outlet of the flow channel (11-2) are positioned on the same side wall of the water cooling plate (11).
7. The thermoelectric refrigeration based CCD camera refrigeration device of claim 6, wherein: the water-cooling joint (15) is a water-cooling joint of British system sealing pipe threads.
8. The CCD camera cooling device based on thermoelectric cooling of claim 1, 2, 3, 5 or 7, wherein: the heat pipe concave channels are arranged in parallel and at equal intervals, and the heat pipes (18) are arranged in parallel and level with the end surface of the heat pipe seat (17).
9. The CCD camera cooling device based on thermoelectric cooling of claim 8, wherein: the refrigeration sealing system further comprises an O-shaped sealing ring (9), and the lower end of the refrigeration cavity (5) is connected with the water cooling plate (11) in a sealing mode through the O-shaped sealing ring (9).
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| CN115023085B (en) * | 2022-07-22 | 2024-03-15 | 中国大恒(集团)有限公司北京图像视觉技术分公司 | Condensation preventing structure for high-resolution camera |
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