CN115460335A

CN115460335A - Video camera

Info

Publication number: CN115460335A
Application number: CN202210992968.1A
Authority: CN
Inventors: 张�浩; 周斌
Original assignee: Hangzhou Hikvision Digital Technology Co Ltd
Current assignee: Hangzhou Hikvision Digital Technology Co Ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-12-09
Anticipated expiration: 2042-08-18
Also published as: CN115460335B

Abstract

The application discloses a camera. The camera comprises a shell assembly, a camera and a front-end refrigerating assembly. The shell component is surrounded to form a mounting cavity; the camera is arranged in the mounting cavity and comprises a front end plate and a front end lens arranged on the front end plate; front end refrigeration subassembly sets up in the installation cavity, front end refrigeration subassembly includes first spill refrigeration board, second spill refrigeration board and first TEC refrigeration part, first spill refrigeration board and second spill refrigeration board fixed connection enclose and establish formation installation space, the front end plate sets up in installation space and fixed mounting on first spill refrigeration board, the front end camera lens is located one side that first spill refrigeration board was kept away from to the front end plate and passes second spill refrigeration board and stretch out in installation space's outside, the cold face laminating of first TEC refrigeration part sets up in one side that first spill refrigeration board deviates from installation space. The camera can normally operate in a high-temperature environment, and the use scene of the camera is widened.

Description

Video camera

Technical Field

The application relates to the technical field of camera devices, in particular to a camera.

Background

With the increasing demand for intellectualization and multi-functionalization of the camera, the form of the camera becomes more and more, and the use scene is more diversified. The existing camera used in the high-temperature environment generally adopts a water-cooling heat dissipation mode to dissipate heat, and the external cold water is mainly used for cooling the shell of the camera, so that the purpose of preventing the camera from being damaged in the high-temperature environment is finally achieved. However, the water-cooling heat dissipation method only needs external water supply and can adapt to the environment with a temperature below 60 ℃, so that the use scene is limited, and the arrangement of the water supply system also increases the use cost of the camera and is difficult to meet the use requirements of people.

Disclosure of Invention

The main purpose of the present application is to provide a camera, so as to solve the problems of limited use scene and high use cost of the camera in the prior art.

According to an aspect of an embodiment of the present application, there is provided a camera including:

the shell component is arranged in a surrounding mode to form a mounting cavity;

the camera is arranged in the mounting cavity and comprises a front end plate and a front end lens arranged on the front end plate;

front end refrigeration subassembly, front end refrigeration subassembly set up in the installation cavity, front end refrigeration subassembly includes first spill refrigeration board, second spill refrigeration board and first TEC refrigeration part, first spill refrigeration board with second spill refrigeration board fixed connection encloses and establishes and form installation space, the front end plate sets up in installation space and fixed mounting on first spill refrigeration board, the front end lens is located the front end plate is kept away from one side of first spill refrigeration board and is passed second spill refrigeration board and stretch out in installation space's outside, the cold side laminating of first TEC refrigeration part set up in first spill refrigeration board deviates from one side of installation space.

Further, the first concave refrigeration plate comprises a first plate main body, a first bending lug block and a second bending lug block, wherein the first bending lug block and the second bending lug block are respectively arranged on two opposite sides of the first plate main body and enclose with the first plate main body to form a first concave part;

the second concave refrigeration plate comprises a second flat plate main body, a third bending lug block and a fourth bending lug block, wherein the third bending lug block and the fourth bending lug block are respectively arranged on two opposite sides of the second flat plate main body and enclose with the second flat plate main body to form a second concave part;

the first bending lug block is fixedly connected with the third bending lug block in a butt joint mode, the second bending lug block is fixedly connected with the fourth bending lug block in a butt joint mode, and the first concave portion and the second concave portion jointly enclose and form the installation space.

Furthermore, a first outer flange is arranged at one end, away from the first flat plate main body, of the first bending lug block, and a second outer flange is arranged at one end, away from the first flat plate main body, of the second bending lug block;

a third outer flange is arranged at one end, away from the second flat plate main body, of the third bending lug block, and a fourth outer flange is arranged at one end, away from the second flat plate main body, of the fourth bending lug block;

wherein the first outer flange is in contact with and fixedly connected with the third outer flange surface;

the third outer flange is in face contact with and fixedly attached to the fourth outer flange.

Further, a contact surface area A1 between the first outer flange and the third outer flange, and a contact surface area A2 between the second outer flange and the fourth outer flange satisfy the following relationships:

wherein P is the power of the front lens, k is the thermal conductivity constant of the first outer flange and the second outer flange, and 350 (mm) is taken ² DEG C)/w,. DELTA.T is the control temperature difference, and 1.5 ℃ is taken.

Furthermore, an avoiding through hole is formed in the second flat plate main body, blocking pieces are arranged on two opposite sides of the avoiding through hole, the front-end lens penetrates out of the mounting space from the avoiding through hole, and the minimum distance Q1 between the blocking pieces and the outer edge of the front-end lens meets the following relational expression:

wherein δ is the thickness of the convective heat dissipation boundary layer at the outer edge of the front-end lens, ν is the aerodynamic viscosity coefficient, u is the flow velocity of natural convection of air, and W3 is the width of the front-end lens.

Further, a first gap with a width of H1 is provided between the front end plate and the first flat plate main body, and a first heat conducting interface layer with a thickness of D1 is provided in the first gap, where D1=1.2h1.

Further, a first thermal insulation layer is arranged on one side, away from the installation space, of the first flat plate main body, and the first TEC refrigeration component is arranged on the first thermal insulation layer.

Furthermore, a first mounting groove is formed in the first heat insulation layer, the first TEC refrigeration component is arranged in the first mounting groove, and a second gap is formed between the inner side wall surface of the first mounting groove and the outer edge of the first TEC refrigeration component.

Further, the width G1 of the second gap is 0.2mm to 0.5mm.

Further, the first TEC refrigeration part is a cuboid, a first heat conduction layer is arranged between the first TEC refrigeration part and the inner wall surface of the installation cavity, and the first TEC refrigeration part and the first heat conduction layer are designed to satisfy the following relational expression:

L ₄ W ₄ t ₁ ＝(L ₄ -k ₁ )(W ₄ -k ₁ )t ₂

wherein L is ₄ Is the length, W, of the first TEC refrigeration component ₄ Width of said first TEC refrigeration component, t ₁ Is the width k of the gap between the upper surface of the first TEC refrigeration component and the inner wall surface of the mounting cavity ₁ Is the single-sided reduction of the first TEC refrigeration component, t ₂ Is the thickness of the first heat conducting layer.

Furthermore, the first thermal insulation layer is a clip silica gel layer, the clip silica gel layer comprises a first opening-shaped ring and a second opening-shaped ring arranged around the first opening-shaped ring, the first opening-shaped ring is connected with the second opening-shaped ring through a connecting rib, and the first opening-shaped ring is arranged around the first mounting groove.

Furthermore, the wall thickness of the first square ring is V1, the wall thickness of the second square ring is V2, wherein V1 is more than or equal to 0.2W4, and V2 is less than V1.

Furthermore, the interference amount between the first square ring and the inner wall surface of the installation cavity is t3, the interference amount between the first square ring and the first flat plate main body is t4, the interference amount between the second square ring and the inner wall surface of the installation cavity is t5, the gap between the connecting rib and the inner wall surface of the installation cavity is t6, t4 is more than or equal to 0.2V1 and less than or equal to t4 and less than or equal to 0.4V1, t6 is more than or equal to 0.5mm, and t5 is more than or equal to t3.

Furthermore, the front-end refrigeration assembly further comprises a first partition fixedly arranged in the installation cavity, a first groove is formed in the first partition, a first through hole is formed in the bottom of the first groove, the first concave refrigeration plate and the second concave refrigeration plate are arranged in the first groove, and the front-end lens penetrates out of the first groove from the first through hole.

Furthermore, a second through hole opposite to the first through hole is formed in the shell component, window glass is arranged in the second through hole, and a third gap is formed between the first spacer and the window glass.

Further, the width d2 of the third gap is 0.8mm to 1.3mm.

Further, the thermal resistance R of the first spacer satisfies the following relation:

d2 is the thickness of the outer side wall of the first groove, A is the outer surface area of the first spacer, and lambda 1 is the heat conductivity coefficient of the first spacer.

Further, the upper end face of the first partition is not lower than the surface of the first concave refrigeration plate, which faces away from the installation space.

Further, the width of a gap between the inner wall surface of the first groove and the side edge of the second flat plate main body, where the first bending lug and the fourth bending lug are arranged, is Q3, the depth of the first groove is H3, and Q3 and H3 satisfy the following relational expression:

wherein, ν is an aerodynamic viscosity coefficient, and u is an air natural convection flow velocity.

Further, the width W3 of the front lens satisfies the following relation:

wherein h is the convective heat transfer coefficient, g is the gravitational acceleration, alpha _V The coefficient of bulk expansion of air, ν is the aerodynamic viscosity coefficient, Δ t is the excess temperature, α is the air thermal diffusivity, and λ is the air thermal conductivity.

Further, the camera further includes:

the control main board is arranged in the mounting cavity and is arranged at intervals with the front-end refrigerating assembly;

mainboard refrigeration subassembly, mainboard refrigeration subassembly is including refrigeration panel beating and the refrigeration part of second TEC, refrigeration panel beating fixed mounting be in on the control mainboard, the refrigeration part laminating of second TEC set up in the refrigeration panel beating is kept away from one side of control mainboard.

Furthermore, a fourth gap is formed between the refrigeration metal plate and the control main board, and a second heat conduction interface layer is arranged in the fourth gap.

Further, the thickness of the second heat conduction interface layer is 0.8mm to 1.2mm, and the compressibility of the second heat conduction interface layer is 20% to 30%.

Further, mainboard refrigeration subassembly still includes the second and separates the body, the second separates the body to be fixed the installation intracavity, the second separates and is provided with the second recess on the body, the control mainboard sets up in the second recess, the refrigeration panel beating is located one side that the second recess is close to the tank bottom surface, second TEC refrigeration part sets up the second separates on the body.

Furthermore, a third through hole is formed in the second partition body, the third through hole is located at the bottom of the second groove and communicated with the second groove, a heat insulation piece is arranged in the third through hole, and the second TEC refrigeration component is arranged on the heat insulation piece.

Further, a second heat conduction layer is arranged between the second TEC refrigeration component and the inner wall surface of the installation cavity.

Further, the thickness of the second heat conducting layer is 0.7mm to 0.9mm, and the compressibility of the second heat conducting layer is 20% to 30%.

Further, heat-conducting silicone grease is coated between the second TEC refrigeration component and the refrigeration sheet metal; and/or the presence of a gas in the gas,

and heat-conducting silicone grease is coated between the first TEC refrigerating component and the first concave refrigerating plate.

Further, shell subassembly includes protecgulum and hou gai, the periphery of back lid is provided with radiating fin, the second separates the fixed setting of body and covers after, radiating fin's heat radiating area F satisfies following formula:

wherein Q is the heat dissipation power of the rear cover, hc is a natural convection heat transfer coefficient of air, Δ t1 is the temperature rise of the heat dissipation fins, and η is the heat dissipation efficiency of the heat dissipation fins.

Furthermore, the height of the outer surface of the heat dissipation fin protruding out of the rear cover on the side away from the second TEC refrigeration part is H, the distance between two adjacent heat dissipation fins is d, wherein,

d/H is more than or equal to 0.25 and less than or equal to 0.3, and d is not less than 3mm.

Further, the back lid is the cuboid setting, radiating fin follows the length direction of back lid extends, radiating fin's centre is provided with the disconnection region, the disconnection region is followed lid length direction's width D3 is 4mm to 6mm after.

Compared with the prior art, the technical scheme of the application has at least the following technical effects:

the camera is provided with the front-end refrigeration assembly, the first concave refrigeration plate and the second concave refrigeration plate of the front-end refrigeration assembly can be arranged in an enclosing mode to form an installation space, after the camera is assembled, the front-end refrigeration assembly is arranged on the periphery of the camera in an enclosing mode, at the moment, the first concave refrigeration plate and the second concave refrigeration plate can be used for transferring refrigeration capacity through the first TEC refrigeration component arranged on the first concave refrigeration plate, and therefore the camera can be effectively cooled and cooled from the periphery of the camera. Compared with the prior art that a water cooling mode is adopted, the first TEC refrigeration part has the advantages that the cooling effect is good, an external water supply system is not needed, the production and manufacturing cost is low, the camera can adapt to the environment with the environment temperature of more than 85 ℃, and the use environment of the camera is effectively expanded.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a first cross-sectional view of a camera disclosed in an embodiment of the present application;

FIG. 2 is an exploded view of a camera disclosed in an embodiment of the present application;

FIG. 3 is a first exploded view of a front end refrigeration assembly portion as disclosed in an embodiment of the present application;

FIG. 4 is a second exploded view of a portion of the front end refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 5 is a first cross-sectional view of a portion of a front end refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 6 is a side view of a portion of a front end refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 7 is a third exploded view of a portion of the front end refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 8 is a second cross-sectional view of a portion of the front end refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 9 is an enlarged view of area M of FIG. 8;

FIG. 10 is a cross-sectional view of a front end refrigeration assembly and front cover portion as disclosed in an embodiment of the present application;

FIG. 11 is a second cross-sectional view of a camera disclosed in an embodiment of the present application;

FIG. 12 is an enlarged view of area I of FIG. 11;

FIG. 13 is an enlarged view of FIG. 12 in area II;

FIG. 14 is a top view of a front end refrigeration assembly portion of the present disclosure;

FIG. 15 is an exploded view of a portion of a control motherboard and motherboard cooling assembly as disclosed in an embodiment of the present application;

FIG. 16 is a cross-sectional view of a portion of a control motherboard and motherboard cooling assembly as disclosed in an embodiment of the present application;

fig. 17 is a partially enlarged view of a portion of the control motherboard and the motherboard cooling assembly disclosed in the embodiment of the present application;

fig. 18 is a perspective view of a main board refrigeration assembly part disclosed in an embodiment of the present application;

FIG. 19 is a top view of a portion of a main panel refrigeration assembly as disclosed in an embodiment of the present application;

FIG. 20 is a top view of a rear cover disclosed in an embodiment of the present application;

FIG. 21 is a front view of a rear cover disclosed in an embodiment of the present application;

FIG. 22 is a side view of a rear cover disclosed in an embodiment of the present application.

Wherein the figures include the following reference numerals:

10. a housing assembly; 11. a front cover; 12. a rear cover; 121. a heat dissipating fin; 122. a disconnection region; 101. a mounting cavity; 102. a second through hole; 20. a camera; 21. a front end plate; 22. a front-end lens; 30. a front end refrigeration assembly; 31. a first concave refrigeration plate; 311. a first plate main body; 312. a first bending lug; 3121. a first outer flange; 313. a second bending lug block; 3131. a second outer flange; 314. a first recess; 32. a second concave refrigeration plate; 321. a second plate body; 3211. avoiding the through hole; 3212. a baffle plate; 322. a third bending lug block; 3221. a third outer flange; 323. a fourth bending lug; 3231. a fourth outer flange; 324. a second recess; 33. a first TEC refrigeration component; 34. a first thermal interface layer; 35. a first insulating layer; 351. a first mounting groove; 352. a first bite-shaped ring; 353. a second mouth-shaped ring; 354. connecting ribs; 36. a first spacer; 361. a first groove; 362. a first through hole; 363. an upper end surface; 37. a first heat conducting layer; 301. an installation space; 302. a first gap; 303. a second gap; 304. a third gap; 40. a control main board; 50. a mainboard refrigeration assembly; 51. refrigerating the metal plate; 52. a second TEC refrigeration component; 53. a second thermal interface layer; 54. a second spacer; 541. a second groove; 542. a third through hole; 55. a thermal insulation member; 56. a second thermally conductive layer; 501. a fourth gap; 60. a window glass.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

Referring to fig. 1, 2, and 8, in accordance with an embodiment of the present invention, a camera is provided that includes a housing assembly 10, a camera head 20, and a front end cooling assembly 30.

Wherein, the housing assembly 10 encloses to form a mounting cavity 101; the camera 20 is arranged in the mounting cavity 101, and the camera 20 comprises a front end plate 21 and a front end lens 22 arranged on the front end plate 21; front end refrigeration assembly 30 sets up in installation cavity 101, front end refrigeration assembly 30 includes first spill refrigeration board 31, second spill refrigeration board 32 and first TEC refrigeration part 33, first spill refrigeration board 31 and second spill refrigeration board 32 fixed connection enclose and establish formation installation space 301, front end plate 21 sets up in installation space 301 and fixed mounting on first spill refrigeration board 31, front end lens 22 is located one side that first spill refrigeration board 31 was kept away from to front end plate 21 and passes second spill refrigeration board 32 and stretch out in the outside of installation space 301, the laminating of the cold face of first TEC refrigeration part 33 sets up in one side that first spill refrigeration board 31 deviates from installation space 301.

Because the camera in this embodiment is provided with the front-end refrigeration assembly 30, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 of the front-end refrigeration assembly 30 may be enclosed to form an installation space 301, after the camera is assembled, the front-end refrigeration assembly 30 is enclosed at the periphery of the camera 20, at this time, through the first TEC refrigeration component 33 arranged on the first concave refrigeration plate 31, cold energy can be transferred to the first concave refrigeration plate 31 and the second concave refrigeration plate 32, and further, the camera 20 can be effectively cooled and radiated from the periphery of the camera 20. Compared with the prior art that a water cooling mode is adopted, the first TEC refrigerating part 33 in the embodiment has a good cooling effect, does not need an external water supply system, is low in production and manufacturing cost, can adapt to an environment with an environmental temperature of more than 85 ℃, effectively expands the use environment of the camera, and can improve the market competitiveness of the camera.

It can be understood that the first TEC refrigeration component 33 described in this embodiment is a semiconductor refrigerator, and when a direct current passes through a couple composed of two semiconductor materials, one end of the semiconductor refrigerator absorbs heat and the other end releases heat, so that a good refrigeration purpose can be achieved. In this application, the surface of the first TEC refrigeration component 33 close to the first concave refrigeration plate 31 is a refrigeration surface, which is convenient for effectively dissipating heat of the camera 20 installed in the installation space 301.

Referring to fig. 1, the housing assembly 10 in this embodiment includes a front cover 11 and a rear cover 12, the front cover 11 and the rear cover 12 may be fixedly connected together by welding, clamping, screwing, or the like, and the front cover 11 and the rear cover 12 enclose a mounting cavity 101 to form a mounting, so as to facilitate mounting of the camera 20 and the front end refrigeration assembly 30.

Of course, in other embodiments of the present application, the housing assembly 10 may further include three or more cover bodies, and any other arrangement that can enclose and form a structure that can assemble the camera 20, the front end cooling assembly 30, and the like is within the protection scope of the present application.

As shown in fig. 1 to 5, in a specific embodiment of the present application, the first concave refrigeration plate 31 includes a first plate main body 311, a first bending ear piece 312 and a second bending ear piece 313, the first bending ear piece 312 and the second bending ear piece 313 are respectively disposed on two opposite sides of the first plate main body 311 and enclose the first plate main body 311 to form a first recess 314; the second concave refrigeration plate 32 comprises a second plate main body 321, a third bending lug block 322 and a fourth bending lug block 323, wherein the third bending lug block 322 and the fourth bending lug block 323 are respectively arranged at two opposite sides of the second plate main body 321 and surround the second plate main body 321 to form a second concave part 324; the first bending lug block 312 is fixedly connected with the third bending lug block 322 in a butt joint mode, the second bending lug block 313 is fixedly connected with the fourth bending lug block 323 in a butt joint mode, and the first concave portion 314 and the second concave portion 324 jointly enclose to form the installation space 301, so that necessary space is conveniently provided for installation of the camera 20. Meanwhile, after the camera 20 is mounted, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 are integrally arranged on the periphery of the camera 20 in a surrounding state, and therefore the camera 20 is more suitable for heat dissipation and cooling.

In the actual processing and production process, the first flat plate main body 311, the first bending lug block 312 and the second bending lug block 313 are integrally formed; the second plate main body 321, the third bending lug block 322 and the fourth bending lug block 323 are integrally formed, so that the structure is stable and reliable, and the processing and assembling are more suitable. Optionally, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 are both sheet metal parts, so that the manufacturing cost is low and the heat dissipation effect is good.

Further, a first outer flange 3121 is disposed at an end of the first bending ear piece 312 away from the first flat plate main body 311, and a second outer flange 3131 is disposed at an end of the second bending ear piece 313 away from the first flat plate main body 311; correspondingly, a third outer flange 3221 is arranged at one end of the third bending lug block 322 far away from the second flat plate main body 321, and a fourth outer flange 3231 is arranged at one end of the fourth bending lug block 323 far away from the second flat plate main body 321; wherein the first outer flange 3121 is in surface contact with and fixedly connected to the third outer flange 3221; the third outer flange 3221 is in surface contact with and fixedly connected to the fourth outer flange 3231. So set up, can increase the area of contact between first spill refrigeration board 31 and the second spill refrigeration board 32, more be suitable for the heat and transmit between first spill refrigeration board 31 and second spill refrigeration board 32, can effectively dispel the heat to camera 20.

In practical design, the contact areas between the first outer flange 3121 and the third outer flange 3221, and between the second outer flange 3131 and the fourth outer flange 3231 are limited by the cooling surface and the control temperature difference Δ T, the first concave cooling plate 31 and the second concave cooling plate 32 are connected through the first outer flange 3121, the third outer flange 3221, the second outer flange 3131 and the fourth outer flange 3231, and are locked through screws, so that the pressure fit between the first concave cooling plate 31 and the second concave cooling plate 32 is ensured, and the heat transfer is more suitable. In the present embodiment, the contact surface area A1 between the first outer flange 3121 and the third outer flange 3221, and the contact surface area A2 between the second outer flange 3131 and the fourth outer flange 3231 satisfy the following relational expressions:

wherein P is the power of the front lens 22, 0.5w is taken as the heat conduction constant of the first outer flange 3121 and the second outer flange 3131, and 350mm is taken as ² The temperature difference is controlled by delta T, the temperature is 1.5 ℃, and the temperature of A1 and A2 is 120mm ² 。

In order to facilitate the installation of the front-end lens 22, an avoiding through hole 3211 is provided on the second plate main body 321 in this embodiment, blocking pieces 3212 are provided on two opposite sides of the avoiding through hole 3211, the front-end lens 22 penetrates the outside of the installation space 301 from the avoiding through hole 3211, and a minimum distance Q1 between the blocking pieces 3212 and an outer edge of the front-end lens 22 satisfies the following relational expression:

wherein δ is the thickness of the convective heat dissipation boundary layer at the outer edge of the front-end lens 22, ν is the aerodynamic viscosity coefficient, u is the flow velocity of natural convection of air, 0.2m/s is taken, and W3 is the width of the front-end lens 22.

In actual operation, the minimum distance Q1 between the catch 3212 on the second concave refrigeration plate 32 and the outer edge of the front lens 22 is delta-constrained, which is required to increase convection strength

In this manner, the convective heat transfer capability is maximized, facilitating efficient transfer of the refrigeration energy released by the first TEC refrigeration component 33 to the distal-most end of the front lens 22.

In a specific embodiment of the present application, δ is 1.5mm, and Q1 is 2mm, so that the minimum distance Q1 between the blocking piece 3212 and the outer edge of the front lens 22 can be greater than the thickness of the convective heat dissipation boundary layer at the outer edge of the front lens 22.

In the present embodiment, the width W3 of the front lens 22 satisfies the following relation:

wherein h is the convective heat transfer coefficient, g is the gravitational acceleration, and α V is the coefficient of bulk expansion of air; nu is the aerodynamic viscosity coefficient, delta t is the excess temperature, alpha is the air thermal diffusivity, and lambda is the air thermal conductivity.

During actual design, the width W3 of the front-end lens 22 is constrained by the requirement of increasing the convective heat transfer coefficient h and the diameter of the front-end lens 22, and as can be seen from the convective heat transfer coefficient design, the front-end lens 22 needs to be as small as possible and is affected by the coverage area, the width W3 of the front-end lens 22 needs to be consistent with the diameter of the front-end lens 22, and in a specific embodiment of the present application, the diameter and the width W3 of the front-end lens 22 are 14mm.

Referring to fig. 5 to 9, a first gap 302 with a width H1 is disposed between the front plate 21 and the first plate main body 311 in the present embodiment, and a first thermal interface layer 34 with a thickness D1 is disposed in the first gap 302. With the arrangement, the first thermal interface layer 34 can rapidly transmit the cold energy released by the first TEC refrigeration component 33 to the front end plate 21, so as to rapidly dissipate the heat of the camera 20. Alternatively, the first heat-conducting interface layer 34 may be a heat-conducting silicone layer or the like. The compression amount of the first heat-conductive interface layer 34 is controlled to 20% to 30%, and in the present embodiment, D1=1.2h1 is preferably set so as to be able to be suitably bonded to the first plate main body 311 and the front end plate 21, and further, the heat conduction efficiency between the first plate main body 311 and the front end plate 21 in the present embodiment can be improved. Optionally, in this embodiment, a heat conductive silicone grease is coated between the first TEC refrigeration component 33 and the first plate main body 311, so that contact thermal resistance can be further reduced, and heat dissipation performance can be optimized.

Further, in this embodiment, a first thermal insulation layer 35 is disposed on a side of the first plate main body 311 away from the installation space 301, the first TEC refrigeration component 33 is disposed on the first thermal insulation layer 35, and through an effect of the first thermal insulation layer 35, cold energy released by the first TEC refrigeration component 33 can be prevented from being transmitted toward outside air of the first TEC refrigeration component 33, and cold energy released by the first TEC refrigeration component 33 can be ensured to be transmitted toward a direction close to the first plate main body 311 as much as possible, so that a refrigeration effect of the front-end refrigeration component 30 in this embodiment can be further improved.

As shown in fig. 2, 3, and 10 to 14, in the present embodiment, the first thermal insulation layer 35 is provided with a first mounting groove 351, the first TEC cooling member 33 is provided in the first mounting groove 351, and a second gap 303 is provided between an inner side wall surface of the first mounting groove 351 and an outer edge of the first TEC cooling member 33, so that the first thermal insulation layer 35 can be prevented from being damaged by the second gap 303 when the first TEC cooling member 33 operates. The width G1 of the second gap 303 is 0.2mm to 0.5mm, for example, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, and by making the width G1 of the second gap 303 be 0.2mm to 0.5mm, not only can the first thermal insulation layer 35 be prevented from being damaged when the first TEC refrigeration component 33 operates, but also the thermal insulation effect of the first thermal insulation layer 35 on the first TEC refrigeration component 33 can be ensured. In actual installation, the first heat insulation layer 35 can be fixed on the first concave refrigeration plate 31 in a bonding mode and the like, and the structure is simple and convenient to implement.

Specifically, the first TEC refrigeration component 33 in this embodiment is a rectangular parallelepiped, a first heat conduction layer 37 is disposed between the first TEC refrigeration component 33 and the inner wall surface of the mounting cavity 101, and the first TEC refrigeration component 33 and the first heat conduction layer 37 are designed to satisfy the following relation:

L ₄ W ₄ t ₁ ＝(L ₄ -k ₁ )(W ₄ -k ₁ )t ₂

wherein L is ₄ Is the length, W, of the first TEC refrigeration component 33 ₄ Is the width, t, of the first TEC refrigeration component 33 ₁ The width of the gap between the upper surface of the first TEC refrigeration member 33 and the inner wall surface of the mounting cavity 101 is k1, which is the reduction amount of one side of the first TEC refrigeration member 33, and t2 is the thickness of the first heat conduction layer 37.

Specifically, the thickness of the first heat conduction layer 37 in this embodiment is 1mm, and the compression rate reaches 30%, so that the contact thermal resistance can be effectively reduced, and the heat dissipation performance can be optimized. The side length of the first TEC refrigeration part 33 is L ₄ xW ₄ =30mmx15mm, and according to the principle of conservation of mass, when the first TEC refrigeration component 33 is completely covered after compression, the calculation formula of the side length of the first heat conduction layer 37 compared with the side length of the first TEC refrigeration component 33 and the single-sided reduction k1 is L ₄ W ₄ t ₁ ＝(L ₄ -k ₁ )(W ₄ -k ₁ )t ₂ According to the design parameters of this embodiment, the single-sided shrinkage value k1 of the first TEC refrigeration components 33 in this embodiment is 0.4mm, that is, the length of the first heat conduction layer 37 is 29.6mmx14.6mm.

Further, the first thermal insulation layer 35 in this embodiment is a loop silica gel layer, and the hardness of the loop silica gel layer is 45 ± 5 degrees. Specifically, the clip-shaped silica gel layer comprises a first mouth-shaped ring 352 and a second mouth-shaped ring 353 arranged around the first mouth-shaped ring 352, the first mouth-shaped ring 352 and the second mouth-shaped ring 353 are connected through a connecting rib 354, and the first mouth-shaped ring 352 is arranged around a first mounting groove 351 so as to mount the first TEC refrigeration component 33.

During actual design, the wall thickness V1 of the first mouth-shaped ring 352 of the square-shaped silica gel layer is constrained by the minimum side length W4 of the first TEC refrigerating part 33 of the sealing element, and V1 is enabled to be larger than or equal to 0.2W4 in the application, so that the internal sealing performance of the first mouth-shaped ring 352 is guaranteed, water vapor entering is reduced, and water vapor condensation is prevented. Alternatively, V2 is set to 3mm in the present embodiment. Because the first mouth-shaped circle 352 department on circle shape silica gel layer has possessed certain leakproofness, can make the wall thickness V2 of second mouth-shaped circle 353 < V1, so, can reduce the area of contact of circle shape silica gel layer outer lane and the refrigeration face of its both sides, can play fine thermal-insulated effect, during actual design, can set up the thickness V2 of second mouth-shaped circle 353 to 2mm.

Further, after the camera is assembled, the interference amount between the first square-mouth-shaped ring 352 and the inner wall surface of the mounting cavity 101 in this embodiment is t3, the interference amount between the first square-mouth-shaped ring 352 and the first flat plate main body 311 is t4, the interference amount between the second square-mouth-shaped ring 353 and the inner wall surface of the mounting cavity 101 is t5, and the gap between the connecting rib 354 and the inner wall surface of the mounting cavity 101 is t6, wherein t4 is more than or equal to 0.2V1 and less than or equal to t3 and less than or equal to 0.4V1, t6 is more than or equal to 0.5mm, and t5 is more than or equal to t3. So set up, not only can guarantee the inside leakproofness of first insulating layer 35, can avoid interfering the too big assembling nature of influence of volume again. The first heat insulating layer 35 is hollowed out in the area between the first and second mouth-shaped

rings

352 and 353, and the height t6 is reduced by not less than 0.5mm, so as to reduce the overlapping area between the first heat insulating layer 35 and the inner wall surface of the installation cavity 101 and the first concave refrigeration plate 31, and reduce the heat transfer between the housing assembly 10 and the first concave refrigeration plate 31.

Referring to fig. 1 to 14, the front end refrigeration assembly 30 in this embodiment further includes a first partition 36 fixedly disposed in the installation cavity 101, a first groove 361 is disposed on the first partition 36, a first through hole 362 is disposed at the bottom of the first groove 361, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 are both disposed in the first groove 361, and the front end lens 22 penetrates out of the first groove 361 from the first through hole 362. Through the effect of this first insulator 36, can wrap up camera 20, can reduce the influence of the hot air in the shell subassembly 10 that camera 20 after the refrigeration is heated.

In actual installation, the first spacer 36 can be fixedly installed in the installation cavity 101 by screws, snaps, pins, and the like. In the present application, it is preferable that the first spacer 36 is fixed by the positioning column and then fixed by tightening a screw, and any other modification that can fix the first spacer 36 in the mounting cavity 101 is within the scope of the present application.

Further, the housing assembly 10 of the present embodiment is provided with a second through hole 102 opposite to the first through hole 362, a window glass 60 is provided in the second through hole 102, and after the housing assembly is mounted, the front lens 22 directly faces the window glass 60, so as to facilitate the camera shooting function. A third gap 304 is provided between the first spacer 36 and the window glass 60, and the third gap 304 functions as a thermal insulator. The width d2 of the third gap 304 is 0.8mm to 1.3mm, for example 0.8mm, 1mm or 1.3mm, so that the field of view of the front lens 22 can be ensured.

Further, the thermal resistance R of the first spacer 36 satisfies the following relation:

wherein D2 is the thickness of the outer sidewall of the first groove 361, a is the outer surface area of the first spacer 36, and λ 1 is the thermal conductivity of the first spacer 36. From the above relation, it can be known that the thermal resistance R of the first spacer 36 is in positive correlation with D1, and in order to increase the thermal resistance R and enhance the heat insulation effect of the first spacer 36, D2 is set to be 2mm in the present embodiment.

To avoid the cold energy overflow, the upper end face 363 of the first partition 36 in this embodiment is not lower than the surface of the first concave refrigeration plate 31 facing away from the installation space 301.

In the present embodiment, the width of the gap between the inner wall surface of the first concave groove 361 and the side of the second plate body 321 where the first bending lug block 312 and the fourth bending lug block 323 are arranged is Q3, the depth of the first concave groove 361 is H3, and Q3 and H3 satisfy the following relation:

wherein, ν is an aerodynamic viscosity coefficient, and u is a natural convection flow velocity of air, and generally takes a value of 0.2m/s. By enabling Q3 and H3 to satisfy the above relational expression, the cooling capacity of the first TEC refrigeration component 33 can be favorably dissipated into the first spacer 36, and it can be further ensured that the circumference of the farthest end of the front lens 22 is surrounded by the cooling air, in this embodiment, Q3 is 7mm, and H3 is 23mm.

Referring to fig. 15 to 19, the camera in this embodiment further includes a control main board 40 and a main board cooling assembly 50, wherein the control main board 40 is disposed in the installation cavity 101 and spaced apart from the front end cooling assembly 30; the mainboard refrigerating assembly 50 comprises a refrigerating sheet metal 51 and a second TEC refrigerating component 52, the refrigerating sheet metal 51 is fixedly mounted on the control mainboard 40, and the second TEC refrigerating component 52 is attached to one side, far away from the control mainboard 40, of the refrigerating sheet metal 51. During actual work, the effect of the second TEC refrigeration part 52 arranged on the refrigeration sheet metal 51 can transfer cold to the refrigeration sheet metal 51, and then the control main board 40 can be effectively cooled. Compared with the prior art that a water cooling mode is adopted, the second TEC refrigeration component 52 in this embodiment has a good cooling effect, does not need an external water supply system, has a low production and manufacturing cost, and can effectively and lowly expand the use environment of the camera.

It is understood that the second TEC refrigeration component 52 described in this embodiment is also a semiconductor refrigerator, and when a direct current passes through a couple composed of two semiconductor materials, one end absorbs heat and the other end releases heat, so that a good refrigeration purpose can be achieved. In this application, the one side that second TEC refrigeration part 52 is close to refrigeration panel beating 51 is the face of refrigerating, is convenient for carry out effective heat dissipation to control mainboard 40.

Further, be provided with fourth clearance 501 between refrigeration panel beating 51 and the control mainboard 40 in this embodiment, be provided with second heat conduction interface layer 53 in this fourth clearance 501, through the effect of this second heat conduction interface layer 53, can carry out thermal quick transmission between refrigeration panel beating 51 and the control mainboard 40, be convenient for carry out quick cooling to the control mainboard 40. Optionally, in this embodiment, the thickness of the second thermal interface layer 53 is 0.8mm to 1.2mm, for example, 0.8mm, 1mm, or 1.2mm, and the compression ratio of the second thermal interface layer 53 is 20% to 30%, which can effectively reduce contact thermal resistance and optimize heat dissipation performance. Optionally, heat-conducting silicone grease is coated between the second TEC refrigeration component 52 and the refrigeration sheet metal 51 in this embodiment, so that contact thermal resistance can be further reduced, and heat dissipation performance can be optimized.

Further, the main board refrigerating assembly 50 in this embodiment further includes a second partition 54, the second partition 54 is fixed in the installation cavity 101, a second groove 541 is formed in the second partition 54, the control main board 40 is disposed in the second groove 541, the refrigerating sheet metal 51 is located on one side of the second groove 541 close to the groove bottom surface, and the second TEC refrigerating component 52 is disposed on the second partition 54. Through the effect of this second insulator 54, can wrap up control mainboard 40, can reduce the influence of the hot air in the shell subassembly 10 that control mainboard 40 after the refrigeration was heated.

Further, in the present embodiment, the second partition 54 is provided with a third through hole 542, the third through hole 542 is located at the bottom of the second groove 541 and is communicated with the second groove 541, a heat insulating member 55 is provided in the third through hole 542, and the heat insulating member 55 is provided with the second TEC refrigerating member 52. Through set up third through-hole 542 on second spacer 54, be convenient for support heat insulating part 55 and second TEC refrigeration part 52, after the installation, second TEC refrigeration part 52 can laminate well on refrigeration panel beating 51, is convenient for carry out effective cooling and heat dissipation to control mainboard 40.

Further, in the present embodiment, the second heat conduction layer 56 is disposed between the second TEC refrigeration member 52 and the inner wall surface of the mounting cavity 101, and the second heat conduction layer 56 functions to reduce the thermal resistance of the second TEC refrigeration member 52 and optimize the heat dissipation performance of the second TEC refrigeration member 52. Optionally, the thickness of the second heat conduction layer 56 is 0.7mm to 0.9mm, for example, 0.7mm, 0.8mm, or 0.9mm, and the compression ratio of the second heat conduction layer 56 is 20% to 30%, so that the second TEC refrigeration component 52 can be well attached to the inner wall surface of the mounting cavity 101, and thus the heat conduction efficiency between the first plate main body 311 and the front end plate 21 in this embodiment can be improved. Further, in this embodiment, heat-conducting silicone grease is applied between the second TEC refrigeration part 52 and the refrigeration sheet metal 51, so that contact thermal resistance can be further reduced, and heat dissipation performance can be optimized.

Referring to fig. 20 to 22, in actual design, the heat dissipating fins 121 are disposed on the outer periphery of the rear cover 12 in the present embodiment, the second spacers 54 are fixedly disposed on the rear cover 12, and the heat dissipating area F of the heat dissipating fins 121 satisfies the following formula:

wherein Q is the heat dissipation power of the rear cover 12, hc is the natural convection heat transfer coefficient of air, Δ t1 is the temperature rise of the heat dissipation fins 121, the design is generally 15 ℃, η is the heat dissipation efficiency of the heat dissipation fins 121, and η is calculated as follows:

wherein

Wherein H is the height of the heat dissipation fin 121 protruding from the outer surface of the rear cover 12 on the side away from the second TEC refrigeration part 52, δ is the thickness of the heat dissipation fin 121, λ is the heat conductivity coefficient of the heat dissipation fin 121, and H is the air convection heat transfer coefficient.

On the premise of meeting the required heat dissipation area, the distance between two adjacent heat dissipation fins 121 on the back cover 12 is dd and the height of the heat dissipation fin 121 protruding out of the outer surface of the back cover 12 on the side departing from the second TEC refrigeration part 52 is H, and in the application, H and d satisfy the following relational expression: d/H is more than or equal to 0.25 and less than or equal to 0.3, and d is not less than 3mm.

Based on the above limitations, a preferred combination is adopted by calculation in this embodiment: the length =175mm, width =115mm, h =23mm, d =4mm of the rear cover 12 is taken.

Optionally, the heat dissipation fins in this embodiment extend along the length direction of the back cover 12, the break area 122 is disposed in the middle of the heat dissipation fin 121, the width of the break area 122 along the length direction of the back cover 12 is 4mm to 6mm, for example, 4mm, 5mm, or 6mm, and by such an arrangement, the comprehensive convective heat transfer coefficient can be improved, and the surrounding effect can be improved.

From the above structure, it can be known that:

since the video camera of the present invention is provided with the front end cooling module 30 and the main board cooling module 50. Wherein, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 of the front-end refrigeration assembly 30 can enclose to form an installation space 301, after the camera is assembled, the front-end refrigeration assembly 30 encloses to be arranged at the periphery of the camera 20, at this moment, through the first TEC refrigeration part 33 arranged on the first concave refrigeration plate 31, the first concave refrigeration plate 31 and the second concave refrigeration plate 32 can be used for transmitting cold energy, and then the camera 20 can be effectively cooled and radiated from the periphery of the camera 20. The mainboard refrigerating assembly 50 comprises a refrigerating sheet metal 51 and a second TEC refrigerating component 52, the refrigerating sheet metal 51 is fixedly mounted on the control mainboard 40, and the second TEC refrigerating component 52 is attached to one side, far away from the control mainboard 40, of the refrigerating sheet metal 51. During actual work, the effect of the second TEC refrigeration part 52 arranged on the refrigeration sheet metal 51 can transfer cold to the refrigeration sheet metal 51, and then the control main board 40 can be effectively cooled. Compared with the prior art that a water cooling mode is adopted, the first TEC refrigerating part 33 and the second TEC refrigerating part 52 have good cooling effect, do not need an external water supply system, have low production and manufacturing cost, can adapt to the environment with the environmental temperature of more than 85 ℃, effectively expand the use environment of the camera and improve the market competitiveness of the camera.

In addition, the camera disclosed by the invention has the advantages that through the structural design, the mode of combining heat dissipation, refrigeration and heat preservation is adopted, the internal devices are ensured to work in a safe temperature under the external high-temperature environment, and the use stability of the camera is effectively ensured.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, so that the scope of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A camera, comprising:

front end refrigeration subassembly, front end refrigeration subassembly set up in the installation cavity, front end refrigeration subassembly includes first spill refrigeration board, second spill refrigeration board and first TEC refrigeration part, first spill refrigeration board with second spill refrigeration board fixed connection encloses and establishes and form installation space, the front end plate sets up in installation space and fixed mounting be in on the first spill refrigeration board, the front end lens is located the front end plate is kept away from one side of first spill refrigeration board is passed second spill refrigeration board and stretch out in installation space's outside, the cold face laminating of first TEC refrigeration part set up in first spill refrigeration board deviates from one side of installation space.

2. The camera of claim 1, the first concave refrigeration plate comprising a first plate body, a first bent tab, and a second bent tab, the first bent tab and the second bent tab disposed on opposite sides of the first plate body and surrounding the first plate body to form a first recess;

3. The camera of claim 2, wherein the first end of the first bending ear piece remote from the first plate body is provided with a first outer flange, and the second end of the second bending ear piece remote from the first plate body is provided with a second outer flange;

a third outer flange is arranged at one end, far away from the second flat plate main body, of the third bending lug block, and a fourth outer flange is arranged at one end, far away from the second flat plate main body, of the fourth bending lug block;

4. The camera of claim 3, wherein an area of a contact surface A1 between the first outer flange and the third outer flange, and an area of a contact surface A2 between the second outer flange and the fourth outer flange satisfy the following relationships:

wherein, P is the power of the front-end lens, k is the heat conduction constant of the first outer flange and the second outer flange, 350/w is taken, delta T is the control temperature difference, and 1.5 ℃ is taken.

5. The camera according to claim 2, wherein an avoiding through hole is formed in the second plate main body, blocking pieces are respectively disposed on two opposite sides of the avoiding through hole, the front-end lens penetrates through the avoiding through hole to the outside of the mounting space, and a minimum distance Q1 between each blocking piece and an outer edge of the front-end lens satisfies the following relation:

δ is the thickness of a convection heat dissipation boundary layer at the outer edge of the front-end lens, ν is an aerodynamic viscosity coefficient, u is the flow velocity of natural convection of air, and W3 is the width of the front-end lens.

6. The camera of claim 2, wherein a first gap having a width H1 is disposed between the front plate and the first plate body, and wherein a first thermally conductive interface layer having a thickness D1 is disposed within the first gap, wherein D1=1.2h1.

7. The camera of claim 2, wherein a side of the first plate body facing away from the mounting space is provided with a first thermal insulation layer, and the first TEC refrigeration component is provided on the first thermal insulation layer.

8. The camera as claimed in claim 7, wherein the first thermal insulation layer is provided with a first mounting groove, the first TEC refrigeration component is provided in the first mounting groove, and a second gap is provided between an inner side wall surface of the first mounting groove and an outer edge of the first TEC refrigeration component.

9. The camera of claim 8, the width G1 of the second gap being 0.2mm to 0.5mm.

10. The camera of claim 8, wherein the first TEC refrigeration component is disposed in a rectangular parallelepiped, a first heat conduction layer is disposed between the first TEC refrigeration component and an inner wall surface of the mounting cavity, and the first TEC refrigeration component and the first heat conduction layer are designed to satisfy the following relation:

L ₄ W ₄ t ₁ ＝(L ₄ -k ₁ )(W ₄ -k ₁ )t ₂

wherein L is ₄ Is the length, W, of the first TEC refrigeration component ₄ Is the width of the first TEC refrigeration part, t ₁ Is the width, k, of the gap between the upper surface of the first TEC refrigeration component and the inner wall surface of the mounting cavity ₁ Is the single-sided reduction, t, of the first TEC refrigeration component ₂ Is the thickness of the first heat conducting layer.