CN219761139U - Infrared thermal imaging instrument - Google Patents

Abstract

The embodiment of the utility model discloses an infrared thermal imager, which relates to the technical field of thermal imaging; the infrared thermal imager comprises a shield, a thermal imaging machine core and a heat pipe radiator; the material of the shield is at least partially metal, and the thermal imaging core and the heat pipe radiator are arranged in the shield; the first end of the heat pipe radiator is connected with the thermal imaging machine core, and the second end of the heat pipe radiator is connected with the metal part on the protective cover. The method and the device are suitable for infrared thermal imaging of the measured target.

Description

Infrared thermal imaging instrument

Technical Field

The utility model relates to the technical field of thermal imaging, in particular to an infrared thermal imager.

Background

The infrared thermal imaging device generally comprises a shield and a thermal imaging machine core arranged in the shield, wherein radiating fins are arranged on the thermal imaging machine core, and the radiating fins are radiated by utilizing a radiating fan in the shield, so that the radiation of the thermal imaging machine core is realized. However, when the thermal imaging core and the lens are put into the shield together, the heat is dissipated in the sealed cavity of the shield only by the internal circulation of the heat dissipation fan, and the related temperature rise index is difficult to meet, so that the image quality is affected.

Disclosure of Invention

Therefore, an objective of the embodiments of the present utility model is to provide a thermal infrared imager with better heat dissipation performance.

In order to achieve the above purpose, an embodiment of the present utility model provides an infrared thermal imager, including a shield, a thermal imaging core, and a heat pipe radiator; the thermal imaging machine core and the heat pipe radiator are arranged in the shield; the first end of the heat pipe radiator is connected with the thermal imaging machine core, and the second end of the heat pipe radiator is connected with the metal part on the shield.

According to a specific implementation manner of the embodiment of the utility model, the thermal imaging movement comprises a controller, and the first end of the heat pipe radiator is connected with the controller.

According to a specific implementation manner of the embodiment of the utility model, the thermal imaging movement comprises a refrigeration compressor, and the first end of the heat pipe radiator is connected with the refrigeration compressor.

According to a specific implementation manner of the embodiment of the utility model, the heat pipe radiator comprises a hot end metal plate, a metal pipe and a cold end metal plate, wherein the hot end metal plate is connected with the thermal imaging machine core; one end of the metal tube is connected with the hot end metal plate in a metallographic mode, the other end of the metal tube is connected with the cold end metal plate in a metallographic mode, and the cold end metal plate is connected with the metal part on the shield.

According to a specific implementation manner of the embodiment of the utility model, the shield comprises a shell and a rear cover, wherein the rear cover is a metal rear cover, and the rear cover is rotationally connected to the shell through threads; the thermal imaging machine core and the heat pipe radiator are at least partially arranged in the shell, and the second end of the heat pipe radiator is connected with the rear cover.

According to a specific implementation manner of the embodiment of the utility model, a flexible heat conducting element is arranged between the rear cover and the second end of the heat pipe radiator.

According to a specific implementation manner of the embodiment of the utility model, the flexible heat conducting element is heat conducting grease.

According to a specific implementation manner of the embodiment of the utility model, a gap is formed between the rear cover and the second end of the heat pipe radiator after the rear cover is completely screwed on the shell, the gap is smaller than 2mm, and the flexible heat conducting piece is filled in the gap.

According to a specific implementation manner of the embodiment of the utility model, a cooling fan is arranged at the side part of the refrigeration compressor in the protective cover.

According to a specific implementation manner of the embodiment of the utility model, the shield comprises a rear cover, the rear cover is a metal cover, more than two radiating fins are arranged on the outer side of the rear cover, and the more than two radiating fins are distributed around the center of the outer side surface of the rear cover; and each radiating fin is in a bent shape.

The infrared thermal imaging device provided by the embodiment of the utility model is characterized in that the heat pipe radiator is arranged in the protective cover of the thermal imaging machine core, the first end of the heat pipe radiator is connected with the thermal imaging machine core, the second end of the heat pipe radiator is connected with the metal part on the protective cover, and heat generated during the operation of the thermal imaging machine core is transferred to the first end of the heat pipe radiator, is transferred to the protective cover through the second end of the heat pipe radiator, and is radiated by the protective cover. Therefore, even if the space in the shield is relatively small and is not beneficial to air flow convection, the thermal imaging machine core can be radiated, so that the infrared thermal imaging instrument has a good radiating effect.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a thermal infrared imager in an embodiment of the utility model;

FIG. 2 is a schematic diagram of the thermal imaging cartridge of FIG. 1;

FIG. 3 is a schematic view of the heat pipe radiator in FIG. 1;

FIG. 4 is a schematic view of a metal tube of a heat pipe radiator according to an embodiment of the present utility model;

FIG. 5 is an enlarged schematic view of a portion of FIG. 1 at A;

fig. 6 is a schematic view of the outer side surface of the rear cover according to an embodiment of the utility model.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The infrared thermal imager is a device for converting thermal distribution data of a target object into a video image by measuring infrared radiation of the target object through means of photoelectric conversion, signal processing and the like by adopting an infrared thermal imaging technology.

In the embodiments of the present utility model, when the infrared thermal imager is used, the direction of the thermal imaging core towards the measured object is referred to as the front of the thermal imaging core. In the case of a measured object, it is located in front of the thermal imaging cartridge.

Fig. 1 to 6 show a schematic structural view of a first embodiment of the infrared thermal imager of the present utility model. First, a main structure of a first embodiment of the infrared thermal imager of the present utility model will be described with reference to fig. 1. Referring to fig. 1, the thermal infrared imager 10 in the present embodiment includes a cover 11, a thermal imaging core 12 and a lens 13, the thermal imaging core 12 and the lens 13 are disposed in the cover 11, and the lens 13 is located in front of the thermal imaging core 12.

The shroud 11 includes a housing 111, a front cover 112, and a rear cover 113.

The housing 111 may be cylindrical. The thermal imaging core and the heat pipe radiator are at least partially arranged in the shell.

A front cover 112 is provided at the front port of the housing 111. The middle part of the front cover 112 is provided with a through hole, and infrared radiation of a measured object can enter the infrared thermal imager through the through hole. A transparent glass 14 is provided inside the front cover 112 (on the side close to the thermal imaging core 12), and the transparent glass 14 is blocked at the through hole to prevent dust and other impurities from entering the shield 11 from the through hole. The front cover 112 and the front port of the housing 111 may be coupled by screw-fit.

A rear cover 113 is provided at the rear port of the housing 111. The rear cover 113 and the rear port of the housing 111 may also be connected by screw-fitting.

The material of the housing 111, the front cover 112 and the rear cover 113 is at least partially metal, such as aluminum, aluminum alloy, stainless steel, etc.

The thermal imaging core 12 is mainly used for performing photoelectric conversion or the like on infrared radiation of a measured object (not shown in the figure).

The lens 13 may be an optical imaging system composed of a plurality of lenses for focusing infrared radiation of a measured object onto a photosensitive element (not shown in the figure) on the thermal imaging core 12 for photoelectric conversion or the like.

In the embodiment of the utility model, the heat pipe radiator is mainly used for radiating the thermal imaging core in the infrared thermal imager, so that the infrared thermal imager has a better radiating effect and can obtain better thermal imaging quality.

The following describes a structure related to the thermal infrared imager of the present utility model, taking fig. 1 as an example.

Referring to fig. 1, the infrared thermal imager of the present embodiment includes a cover 11, a thermal imaging core 12, and a heat pipe radiator 15; the material of the shield 11 is at least partially metal, and the thermal imaging core 12 and the heat pipe radiator 15 are arranged in the shield 11; a first end of the heat pipe radiator 15 is connected to the thermal imaging cartridge 12, and a second end of the heat pipe radiator 15 is connected to the metal portion on the cover 11.

In this embodiment, a heat pipe radiator is disposed in a shield provided with a thermal imaging core, a first end of the heat pipe radiator is connected with the thermal imaging core, a second end of the heat pipe radiator is connected with a metal part on the shield, and heat generated during operation of the thermal imaging core is transferred to the first end of the heat pipe radiator, transferred to the shield via the second end of the heat pipe radiator, and dissipated by the shield. Therefore, even if the space in the shield is relatively small and is not beneficial to air flow convection, the thermal imaging machine core can be radiated, so that the infrared thermal imaging instrument has a good radiating effect, thermal imaging interference is reduced, and good thermal imaging quality can be obtained.

Fig. 2 is a schematic structural view of a thermal imaging cartridge according to a first embodiment of the present utility model. Referring to fig. 2, thermal imaging cartridge 12 includes a controller 122 for controlling the operation of thermal imaging cartridge 12.

The controller 122 generates heat during operation. In some embodiments, the first end of the heat pipe radiator 15 is connected to the controller 122, so that heat generated during the operation of the controller 122 is transferred to the shield 11 through the heat pipe radiator 15, and is dissipated by the shield 11.

Fig. 3 is a schematic structural diagram of a heat pipe radiator according to some embodiments of the utility model. Referring to fig. 3, in some embodiments, the heat pipe radiator 15 includes hot end sheet metal 151, metal pipe 152, and cold end sheet metal 153.

Referring to fig. 1 and 2, the hot side metal plate 151 is connected to the controller 122. The hot-end metal plate 151 may include a bonding portion bonded to the surface of the controller 122, where the bonding portion is bonded to the surface of the controller 122, so as to conduct heat generated during operation of the controller 122 to the metal tube. The hot-end sheet metal 151 may be a plate-like structure made of a metal material such as aluminum, aluminum alloy, or copper (e.g., red copper). To increase the heat transfer performance, a heat transfer pad may be provided between the bonding surface of the bonding portion and the surface of the controller 122 in contact with both. The heat conducting pad can be a heat conducting silica gel pad, heat conducting silicone grease or heat conducting gel grease and the like.

Referring to fig. 3, one end of the metal tube 152 is connected to the hot end metal plate 151 for conducting heat absorbed by the hot end metal plate 151 to the cold end metal plate 153. One end of the metal tube 152 may be welded to the hot end metal plate 151. The metal tube 152 may be a copper tube, an aluminum alloy tube, or the like.

In some embodiments, the metal tube 152 is a hollow structure that relies on the walls of the metal tube 152 to conduct heat.

In other embodiments, the metal tube 152 is hollow and may rely on evaporation, flow, and condensation of liquid within the metal tube 152 to conduct heat.

Fig. 4 is a schematic view of a partial structure of a metal tube according to some embodiments of the present utility model. Referring to fig. 4, a wick 1521 made of a capillary porous material is provided on the inner wall of the metal tube 152, and the wick 1521 is immersed in a saturated liquid capable of volatilizing. The liquid has low boiling point and is easy to volatilize, and can be distilled water, ammonia, methanol or acetone.

The metal tube 152 has a passage through which steam flows. The metal tube 152 has a first end that is an evaporation section R and a second end that is a condensation section (not shown in fig. 4). When the first end of the metal tube 152 is heated, the liquid in the wick evaporates rapidly into a vapor. The vapor with heat moves through the channels from the first end of the metal tube 152 to the second end thereof, and the vapor condenses into a liquid as it transfers heat to the second end. The condensed liquid returns to the first end by capillary action of the wick on the tube wall, thus continually dissipating heat by repeating the above-described cycle.

The other end of the metal tube 152 is connected to a cold end metal plate 153. The other end of the metal tube 152 may be welded to a cold end metal plate 153.

The cold end metal plate 153 (i.e., the second end of the heat pipe radiator) is connected to the metal portion of the shield 11. The cold end metal plate 153 may be a plate-like structure made of metal material such as aluminum, aluminum alloy, or copper (e.g., red copper). To increase the heat conduction performance, a heat conduction pad may be provided between the inner surface of the shield 11 and the bonding surface of the cold end metal plate 153 and the shield 11. The heat conductive pad contacts the inner surface of the shield 11 and the contact surface of the shield 11 where the cold-end metal plate 153 contacts the shield 11. The heat conducting pad can be a heat conducting silica gel pad, heat conducting silicone grease or heat conducting gel grease and the like.

Referring to fig. 1, in some embodiments, the rear cover 113 is made of aluminum alloy, and the cold end metal plate 153 is connected to the rear cover 113.

Referring to fig. 5, a flexible heat conducting member 17 may be provided between the rear cover 113 and the cold end metal plate 153. The flexible heat conducting member 17 is capable of conducting heat and deforming. When the rear cover 113 is screw-coupled to the housing 111, the flexible heat conductive member 17 may be pressed between the rear cover 113 and the cold-end metal plate 153 such that the flexible heat conductive member 17 can be in close contact with the rear cover 113 and the cold-end metal plate 153, thereby rapidly transferring heat from the cold-end metal plate 152 to the rear cover 113.

In some examples, the flexible heat conducting member 17 is a heat conducting gel (also referred to as a heat conducting gel), which is a gel-like heat conducting interface material formed by mixing, stirring and encapsulating a heat conducting filler material with a silicone gel.

Referring to fig. 5, the rear cover 113 is screw-fixed at the rear port of the housing 111. A gap D may exist between the rear cover 113 and the cold end metal plate 153 after being completely screwed down, and the gap D is smaller than 2mm. In some examples, the size of the gap D may be 0.5-1 mm. The gap D is filled with heat conductive grease, thereby forming reliable lap joint heat conduction between the cold end metal plate 153 and the rear cover 113. In the assembly process, the point of the heat-conducting grease can be attached to the inner wall of the rear cover 113 by using a dispensing tool and/or attached to the cold-end metal plate 153, after the rear cover 113 is completely screwed on the shell, the heat-conducting grease is extruded between the rear cover 113 and the cold-end metal plate 153, so that the heat-conducting grease can be in close contact with the rear cover 113 and the cold-end metal plate 153, and heat is rapidly transferred from the cold-end metal plate 152 to the rear cover 113. The clearance D is less than 2mm, can make heat conduction grease produce capillary adsorption between back lid 113 and cold junction panel beating 153, even in higher temperature environment, heat conduction grease also can not drip, can not influence the heat conduction effect.

Referring to fig. 6, in some embodiments, the outer side surface of the rear cover 113 is provided with a plurality of heat dissipating fins 18, which can increase the heat exchange area with air and increase the heat dissipating function. The remainder of the shield may be stainless steel.

The plurality of heat radiation fins 18 on the outer side surface of the rear cover 113 are distributed around the center of the outer side surface of the rear cover 113, so that the heat radiation fins of the rear cover of different infrared thermal imagers have substantially the same trend when the infrared thermal imagers of the present embodiment are mass-produced, so that the appearances of the different infrared thermal imagers are substantially uniform. The difference of appearance consistency among different infrared thermal imagers caused by different circumferential positions of the rear cover relative to the shell 111 after the rear cover is locked due to different thread processing starting positions of each rear cover can be reduced.

The heat dissipation fins can be in a bent shape, such as a fan shape or a substantially fan shape, so that the heat exchange area between the heat dissipation fins and the air can be increased.

In this embodiment, a heat pipe radiator 15 is disposed in a cover 11 provided with a thermal imaging core, a first end of the heat pipe radiator 15 is connected to the thermal imaging core, a second end is connected to a metal portion on the cover 11, and heat generated during operation of the thermal imaging core is transferred to the first end of the heat pipe radiator 15, transferred to the cover 11 via the second end of the heat pipe radiator 15, and dissipated by the cover 11. In this way, even if the space in the shield 11 is relatively small, and the convection of the air flow is not facilitated, the thermal imaging movement can be radiated, so that the thermal infrared imager has a better radiating effect, thermal imaging interference is reduced, and better thermal imaging quality can be obtained.

The controller is a main heat source component, and the first end of the heat pipe radiator 15 is connected with the controller to realize heat dissipation of the controller so as to improve heat dissipation efficiency. The metal tube 152 of the heat pipe radiator 15 has a hollow structure, and can conduct heat by utilizing the evaporation and flow of the liquid adsorbed on the wick on the inner wall of the metal tube 152, and besides the heat conduction by utilizing the tube wall of the metal tube 152, so that the heat dissipation efficiency is higher.

Fig. 1 also shows a schematic structural diagram of a second embodiment of the infrared thermal imager of the present utility model. The thermal infrared imager in the first embodiment may be a non-refrigerated type thermal infrared imager. The infrared thermal imager in this embodiment is a refrigeration type infrared thermal imager. The structure of the thermal infrared imager in this embodiment is substantially the same as that of the thermal infrared imager in the first embodiment, except that in this embodiment, the thermal imaging cartridge 12 further includes a refrigeration compressor 20. The refrigerant compressor 20 provides a low temperature operating environment for the normal operation of the thermal imaging cartridge. The first end of the heat pipe radiator 15 is connected to the refrigeration compressor 20, and heat generated when the refrigeration compressor 20 operates is transferred to the second end of the heat pipe radiator 15 through the metal pipe 152, transferred to the shroud 11 through the second end of the heat pipe radiator 15, and dissipated by the shroud 11. In this way, even if the space in the shield 11 is relatively small, and the convection of the air flow is not facilitated, the thermal imaging movement can be radiated, so that the thermal infrared imager has a better radiating effect, thermal imaging interference is reduced, and better thermal imaging quality can be obtained.

Referring to fig. 1 and 3, the heat pipe radiator 15 includes a hot end metal plate 151, a metal pipe 152, and a cold end metal plate 153. The hot end metal plate 151 is connected with the refrigeration compressor 20; one end of the metal tube 152 is connected with the hot end metal plate 151, the other end of the metal tube 152 is connected with the cold end metal plate 153, and the cold end metal plate 153 is connected with the metal part on the shield 11.

The structure of the heat pipe radiator 15 in the present embodiment is substantially the same as that of the heat pipe radiator 15 in the first embodiment.

To increase the heat conduction performance, a heat conduction pad may be disposed between the surface of the refrigeration compressor 20 and the bonding surface of the hot end metal plate 151 and the refrigeration compressor 20. The heat conductive pads are respectively contacted with the joint surfaces of the hot end metal plate 151 and the refrigeration compressor 20 and contacted with the surface of the refrigeration compressor 20. The heat conducting pad can be a heat conducting silica gel pad, heat conducting silicone grease or heat conducting gel grease and the like.

Referring to fig. 2, in order to increase the heat dissipation effect, a heat dissipation fan 21 is further provided in the shroud 11 at the side of the refrigerant compressor 20 to achieve internal circulation heat dissipation in the shroud 11.

Fig. 1 also shows a schematic structural diagram of a third embodiment of the infrared thermal imager of the present utility model. The infrared thermal imaging apparatus in this embodiment has a structure substantially the same as that of the infrared thermal imaging apparatus in the second embodiment, except that the heat pipe radiator 15 is used for radiating heat from the refrigeration compressor 20 on the thermal imaging core 12 and is also used for radiating heat from the controller 122 on the thermal imaging core 12.

Specifically, the first end of the heat pipe radiator 15 is connected to the controller 122 and the refrigeration compressor 20 on the thermal imaging core 12, so that the first end of the heat pipe radiator 15 can transfer the heat generated by the controller 122 and the refrigeration compressor 20 during operation to the second end of the heat pipe radiator 15 through the metal pipe 152, and transfer the heat to the shield 11 through the second end of the heat pipe radiator 15, so that the shield 11 dissipates the heat. In this way, even if the space in the shield 11 is relatively small, which is not beneficial to the convection of air flow, the thermal imaging core 12 can be radiated, so that the thermal infrared imager has a better radiating effect, reduces the thermal imaging interference, and can obtain better thermal imaging quality.

Referring to fig. 1 to 4, the heat pipe radiator 15 includes a hot end metal plate 151, a metal pipe 152, and a cold end metal plate 153. The hot end metal plate 151 is connected to the controller 122 and the refrigeration compressor 20, respectively. One end of the metal tube 152 is connected with the hot end metal plate 151, the other end of the metal tube 152 is connected with the cold end metal plate 153, and the cold end metal plate 153 is connected with the metal part on the shield 11.

Referring to fig. 3, in some embodiments, the hot-end sheet metal 151 includes a first sheet metal portion 151a and a second sheet metal portion 151b connected to the first sheet metal portion 151 a.

The first sheet metal portion 151a is connected to the controller 122. The second sheet metal portion 151b is connected to the refrigeration compressor 20.

One end of the metal pipe 152 is connected to the first sheet metal portion 151 a. In other embodiments, one end of the metal tube 152 may be connected to the second sheet metal portion 151b, and may also be connected to the first sheet metal portion 151a and the second sheet metal portion 151b at the same time.

The hot end metal plate 151 comprises a first metal plate part 151a and a second metal plate part 151b which are connected together, and can be formed in one step in a rolling mode, so that the hot end metal plate is convenient to process and manufacture.

In other embodiments, the first sheet metal portion 151a and the second sheet metal portion 151b of the hot-end sheet metal 151 may also be two relatively independent sheet metal portions, which are not connected to each other, and each sheet metal portion is connected to the second end of the heat pipe radiator 15 through a different metal pipe 152.

The structures of the metal pipe 152 and the second end of the heat pipe radiator 15 in the present embodiment are substantially the same as those in the first embodiment.

To increase the heat conduction performance, a heat conduction pad may be disposed between the hot end metal plate 151 and the controller 122, and the heat conduction pad is respectively contacted with the hot end metal plate 151 and the controller 122; a thermal pad may also be provided between the hot side metal plate 151 and the refrigerant compressor 20. These thermal pads may be thermal silicone pads, thermal silicone grease, thermal grease, or the like.

The infrared thermal imaging device according to each of the above embodiments may be applied to a medium-wavelength band (wavelength range of 3 μm to 5 μm), a short-wavelength band (wavelength range of 3 μm or less), or a long-wavelength band (wavelength range of 8 μm to 14 μm).

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The above is merely an embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto, and any changes or substitutions that can be easily considered by those skilled in the art within the scope of the present utility model are included in the protection scope of the present utility model, for example, the second end of the heat pipe radiator may be connected to the housing of the shield, or connected to the front cover of the shield, etc. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. An infrared thermal imager is characterized by comprising a shield, a thermal imaging machine core and a heat pipe radiator; the thermal imaging machine core and the heat pipe radiator are arranged in the shield; the first end of the heat pipe radiator is connected with the thermal imaging movement, and the second end of the heat pipe radiator is connected with the metal part on the shield.

2. The thermal infrared imager of claim 1, wherein the thermal imaging cartridge comprises a controller, the first end of the heat pipe heat sink being connected to the controller.

3. The thermal infrared imager as set forth in claim 1 or 2, wherein the thermal imaging cartridge comprises a refrigeration compressor, the first end of the heat pipe radiator being connected to the refrigeration compressor.

4. The infrared thermal imager of claim 1, wherein the heat pipe radiator comprises a hot end metal plate, a metal pipe and a cold end metal plate, the hot end metal plate being connected with the thermal imaging core; one end of the metal tube is connected with the hot end metal plate in a metallographic mode, the other end of the metal tube is connected with the cold end metal plate in a metallographic mode, and the cold end metal plate is connected with the metal part on the shield.

5. The thermal infrared imager of claim 1 or 4, wherein the shield comprises a housing and a rear cover, the rear cover being a metallic rear cover, the rear cover being threadably connected to the housing;

the thermal imaging machine core and the heat pipe radiator are at least partially arranged in the shell, and the second end of the heat pipe radiator is connected with the rear cover.

6. The infrared imager of claim 5, wherein a flexible thermally conductive member is disposed between the rear cover and the second end of the heat pipe radiator.

7. The infrared imager of claim 6, wherein the flexible thermally conductive member is a thermally conductive grease.

8. The infrared imager of claim 6, wherein a gap of less than 2mm exists between the rear cover and the second end of the heat pipe radiator after the rear cover is fully screwed on the housing, and the flexible heat conductive member is filled in the gap.

9. A thermal infrared imager as set forth in claim 3 wherein a cooling fan is provided in the shroud on the side of the refrigeration compressor.

10. The infrared thermal imager of claim 1, wherein the shield comprises a rear cover, the rear cover is a metal cover, and more than two heat dissipation fins are arranged on the outer side of the rear cover and distributed around the center of the outer side surface of the rear cover; each heat radiation fin is in a bending shape.