CN210072297U

CN210072297U - Active refrigeration type fully-closed single-chip LCD projection optical machine

Info

Publication number: CN210072297U
Application number: CN201921191047.5U
Authority: CN
Inventors: 胡先君; 王宇晟; 幸小林
Original assignee: Suzhou Hongtianpao Photoelectric Technology Co Ltd
Current assignee: Suzhou Hongtianpao Photoelectric Technology Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-02-14
Anticipated expiration: 2029-07-26

Abstract

The utility model discloses an active refrigeration type fully-closed single-chip LCD projection optical machine, which comprises a cover body and at least one electric refrigeration element; the cover body encloses a closed space, at least an optical component is accommodated in the closed space, and a gas circulation path is formed in the closed space; the optical assembly comprises an LCD liquid crystal display screen; the gas in the closed space can flow through the LCD along the gas circulation path; the electric refrigerating element is embedded and fixed on one cover wall of the cover body, the cold surface of the electric refrigerating element faces inwards, and the hot surface of the electric refrigerating element is exposed outwards. The utility model discloses a totally enclosed monolithic LCD projection ray apparatus of initiative refrigeration formula encloses out the enclosure space who holds optical assembly through setting up the cover body, can prevent effectively that the dust from getting into optical assembly, and set up electric refrigeration component on the cover wall, electric refrigeration component can initiatively refrigerate and move the heat junction effluvium outside the cover body with the heat of its cold side, and the radiating efficiency is high, has guaranteed that LCD liquid crystal display can work under lower temperature, so can make the projection ray apparatus have very high projection luminance.

Description

Active refrigeration type fully-closed single-chip LCD projection optical machine

Technical Field

The utility model relates to a projection ray apparatus technical field especially relates to an initiative refrigeration formula totally enclosed monolithic LCD projection ray apparatus.

Background

For a projector, dust has a large influence on a projection optical machine of the projector, enters an optical assembly inside the projector and is attached to parts such as a fresnel lens and a reflector, so that the projection effect is greatly influenced, and for manufacturers, the after-sale maintenance cost of the projectors is increased.

At present, there are two main dustproof solutions for LCD projectors in the industry: a so-called semi-closed optical machine is mainly characterized in that the closed optical machine is provided with an air inlet and an air outlet, but the air inlet and the air outlet are both pasted by a high-density dustproof net, so that a certain dustproof effect is achieved, but the dustproof effect is very limited; the other type is a fully-closed optical machine which is mainly characterized in that the optical machine is fully-closed, the best dustproof effect can be achieved, air inlets and air outlets are not arranged, only the heat conduction fins are arranged on one side of the optical machine and penetrate through the inside and the outside of the optical machine, and the function of transferring heat outwards is achieved.

The semi-closed light machine is communicated with the outside, and outside cold air can be continuously introduced into the light machine, so that effective heat dissipation of optical components such as an LCD (liquid crystal display) screen, a polaroid and the like in a high-heat environment is realized, and the brightness of the light machine can be higher. The disadvantage is obviously that the optical system is not completely closed, and dust is still introduced into the optical system, which affects the image display and the service life of the components, and is also disadvantageous to the yield control of the production.

The totally-enclosed optical machine has the outstanding advantages that the display unit is totally-enclosed, and the possibility of dust entering is completely blocked. The product yield can be effectively improved and the production cost can be reduced by matching with a clean production environment. The optical machine working state is more stable, the service life is longer, and the influence of the environmental temperature is less. The disadvantage is that a large amount of heat inside the optical engine cannot be effectively discharged out of the optical engine in time, which causes the temperature of each internal optical component to be higher. Therefore, such light engines can only be used as low-brightness projectors.

Therefore, the prior art has the disadvantages that either the dust cannot be completely prevented or the dust is prevented but the brightness is not high, and the dust prevention and the heat dissipation are both a pair of spears.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the not enough that exists among the prior art, the utility model provides a dustproof effectual and compromise the totally enclosed monolithic LCD projection optical machine of initiative refrigeration formula of thermal diffusivity, it can make the projection optical machine have very high projection luminance when preventing that the dust from getting into optical assembly.

The technical scheme is as follows: in order to achieve the above object, the active refrigeration type fully-enclosed single-chip LCD projection optical machine of the present invention comprises a cover body and at least one electric refrigeration element;

the cover body encloses a closed space, at least an optical component is contained in the closed space, and a gas circulation path is formed in the closed space;

the optical assembly comprises an LCD liquid crystal display screen; the gas in the closed space can flow through the LCD along the gas circulation path;

the electric refrigerating element is embedded and fixed on one cover wall of the cover body, the cold surface of the electric refrigerating element faces inwards, and the hot surface of the electric refrigerating element is exposed outwards.

Further, at least one circulation fan for assisting the circulation of the gas along the gas circulation path is arranged in the housing.

Furthermore, an inner radiator is attached to the cold surface of the electric refrigeration element, an outer radiator is attached to the hot surface of the electric refrigeration element, and the inner radiator is installed in the closed space.

Further, the outer radiator comprises radiating fins and a first axial flow fan;

one side of the radiating fin is attached and fixed to the hot surface of the electric refrigerating element, and the first axial fan is attached to the other side of the radiating fin.

Further, the outer heat radiator comprises a heat pipe, heat radiating fins and a second axial fan;

one end of the heat pipe is connected with the hot surface of the electric refrigerating element, and the other end of the heat pipe is connected with the radiating fins; the second axial fan pair is attached to the heat dissipation fins.

Furthermore, the outer radiator comprises a plurality of fins which are perpendicular to the hot surface of the electric refrigerating element, the fins positioned in the middle are higher, and the heights of the fins are gradually reduced from the middle to the two sides.

Furthermore, the gas in the closed space can flow through a plurality of components needing heat dissipation along the gas circulation path, and the gas refrigerated by the electric refrigeration element preferentially flows through the LCD.

Further, the gas circulation path includes a main path and a plurality of branch paths, all of which are in communication with the main path;

the electric refrigeration element is disposed on the main path;

the gas in the closed space can flow through the LCD screen along the main path or one of the branch paths; each branch path is provided with at least one component needing heat dissipation.

Further, the projection light machine comprises an LED lamp panel and a light funnel; the optical assembly comprises a Fresnel lens which is arranged in parallel with the LCD screen;

the LCD and the LED lamp panel are respectively arranged at the large end and the small end of the light funnel;

the channel formed between the fresnel lens and the light funnel constitutes a part of the gas circulation path.

Further, the optical assembly includes a mirror;

and the cover wall of the cover body positioned at the back side of the reflector is provided with a mounting position for mounting the electric refrigeration element.

Has the advantages that: the utility model discloses a totally enclosed monolithic LCD projection ray apparatus of initiative refrigeration formula encloses out the enclosure space who holds optical assembly through setting up the cover body, can prevent effectively that the dust from getting into optical assembly, and set up electric refrigeration component on the cover wall, electric refrigeration component can initiatively refrigerate and move the heat junction effluvium outside the cover body with the heat of its cold side, and the radiating efficiency is high, has guaranteed that LCD liquid crystal display can work under lower temperature, so can make the projection ray apparatus have very high projection luminance.

Drawings

Fig. 1 is a structural diagram of an active cooling type fully-enclosed single-chip LCD projector according to a first embodiment of the present invention;

fig. 2 is a structural diagram of an active cooling type fully-enclosed single-chip LCD projector according to a second embodiment of the present invention;

fig. 3 is a structural diagram of an active cooling type fully-enclosed single-chip LCD projector according to a third embodiment of the present invention;

fig. 4 is a structural diagram of an active cooling type fully-enclosed single-chip LCD projector according to a fourth embodiment of the present invention.

The names of the parts indicated by the reference numerals in the drawings are as follows:

1-a cover body; 11-gas circulation path; 111-main path; 112-a branch path; 2-an electric refrigeration element; 3-an optical component; 31-LCD liquid crystal display screen; 32-a fresnel lens; 33-a mirror; 34-a projection lens; 4-a circulating fan; 5-an internal heat sink; 6-external radiator; 61-a heat sink; 62-a first axial fan; 63-a heat pipe; 64-heat dissipation fins; 65-second axial fan; 66-a fin; 7-LED lamp panel; 8-light funnel.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The active refrigeration type fully-enclosed single-chip LCD projection optical machine shown in fig. 1 is based on a typical projection optical machine structure, and the typical projection optical machine mainly includes an optical component 3, an LED lamp panel 7 and an optical funnel 8, wherein the optical component 3 includes an LCD liquid crystal display 31, a fresnel lens 32, a reflector 33 and a projection lens 34; the light funnel 8 is of a hopper-shaped structure with two through sides, the LED lamp panel 7 is fixed at the small end of the light funnel, and the LCD screen 31 is fixed at the large end of the light funnel; the fresnel lens 32 is disposed in parallel with the LCD panel 31, and the reflecting mirror 33 is disposed obliquely. The working principle of the projection light machine is that the LED lamp panel 7 emits high-brightness light, the high-brightness light irradiates the LCD liquid crystal display screen 31 through the light funnel 8, content displayed on the LCD liquid crystal display screen 31 penetrates through the Fresnel lens 32 and is projected out from the projection lens 34 after being reflected by the reflecting mirror 33, and therefore the projection lens 34 irradiates on a plane to display an image on the plane. Generally, for a projector, projection brightness is an important index, in order to improve the brightness of the projector, it is necessary to make the LED lamp panel 7 emit stronger light to be incident on the LCD liquid crystal display 31, at this time, the heat quantity of the LCD liquid crystal display 31 rises sharply while the brightness of the LCD liquid crystal display 31 is improved, and if the heat quantity cannot be dissipated in time, the LCD liquid crystal display 31 is easily damaged.

On the basis of the projection optical machine, the active refrigeration type fully-closed single-chip LCD projection optical machine of the utility model also comprises a cover body 1 and at least one electric refrigeration element 2; the cover body 1 encloses a closed space, at least the optical component 3 is accommodated in the closed space, and a gas circulation path 11 is formed in the closed space; the gas in the closed space can flow through the LCD 31 along the gas circulation path 11; the electric refrigerating element 2 is embedded and fixed on one cover wall of the cover body 1, the cold surface of the electric refrigerating element faces inwards, and the hot surface of the electric refrigerating element is exposed outwards. With the structure, the gas in the closed space can circularly flow along the gas circulation path 11 in the closed space, and the gas can take away the heat generated by the LCD 31 when passing through the LCD; when the gas passes through the area where the electric refrigerating element 2 is located, the cold surface of the electric refrigerating element 2 can absorb the heat of the gas and exchange the heat of the gas to the hot surface, so that the heat is dissipated out of the cover body 1 from the hot surface.

In order to make the gas flow smoothly and unidirectionally along the gas circulation path 11 and to increase the circulation heat exchange rate, at least one circulation fan 4 for assisting the gas circulation along the gas circulation path 11 is further provided in the cover 1, and the circulation fan 4 is preferably a vortex fan, but may be a fan of another type.

The electric refrigerating element 2 can be a thermoelectric semiconductor refrigerator, also called as TEC or TEM, which needs to be powered on for operation, and can complete the conversion of heat from a cold surface to a hot surface based on the principle that when current passes through a thermocouple, one node of the thermocouple dissipates heat and the other node absorbs heat, thereby realizing the purpose of exchanging the heat in the closed space out of the cover body 1. Except above-mentioned form, electric refrigeration component 2 can also be other forms, can understand, and all present or future appearance realize by electric drive that the components and parts of the internal and external heat transfer of cover use the technical scheme of the utility model in, all should regard as falling into as the utility model discloses a protection scope.

The number of the electric refrigeration components 2 is not limited, and those skilled in the art can set a plurality of electric refrigeration components 2 on the cover wall of the cover body 1 according to the actual heat dissipation requirement or structural layout requirement to ensure that the heat dissipation performance and the heat dissipation requirement of the projection optical engine are balanced. In addition, the installation position of the electric refrigeration element 2 can also be set according to the requirement, in this embodiment, as shown in fig. 1, the electric refrigeration element 2 is installed on the back side of the reflector 33, and the installation position for installing the electric refrigeration element 2 is arranged on the cover wall of the cover body 1 on the back side of the reflector 33, because the reflector 33 is obliquely arranged, the rear side of the reflector 33 has a larger installation position, the reflector 33 is installed at the position, the installation space at the back position of the reflector 33 can be effectively utilized, after the electric refrigeration element 2, the circulating fan 4 and other elements are installed, the overall length and width of the projection optical machine cannot be obviously increased, and the overall structure of the projection optical machine is compact and small.

The gas circulation path 11 is a continuous annular gas passage formed by a predetermined groove formed in the cover 1, a gap formed between the cover 1 and a member included in the optical unit 3, or a gap formed between a plurality of members included in the optical unit 3, and along which the gas is circulated. As for the embodiment shown in fig. 1, the channel formed between the fresnel lens 32 and the light funnel 8 constitutes a part of the gas circulation path 11, and the other part of the gas circulation path 11 is substantially formed between the cover wall of the cover 1 and the optical assembly 3, and the trajectory of the gas circulation path 11 is shown by the thick dashed line in fig. 1.

In the preferred embodiment, the cold side laminating of electric refrigeration component 2 is provided with interior radiator 5, and its hot side laminating is provided with outer radiator 6, interior radiator 5 is installed in the enclosure, outer radiator 6 sets up outside cover body 1, so can accelerate the heat absorption efficiency of the cold side of electric refrigeration component 2, and accelerate the radiating efficiency of the hot side of electric refrigeration component 2 for electric refrigeration component 2 can be high-efficient to take away the heat of the gas in the enclosure in time and in time dispel, guarantees cooling system's effective operation, and the heat is in time got rid of, can not make the ray apparatus in the inside heat emission that piles up of overlength of service time. The inner radiator 5 is a heat dissipation section bar with a multi-heat dissipation fin structure, the heat dissipation section bar is oppositely attached and fixed on the cold surface of the electric refrigeration element 2, and the inner radiator 5 is arranged close to the circulating fan 4.

The external heat sink 6 can be in various forms, specifically listed below:

in a first embodiment, as shown in fig. 1, the outer radiator 6 comprises fins 61 and a first axial fan 62; one side of the radiating fin 61 is attached and fixed to the hot surface of the electric refrigerating element 2, the first axial fan 62 is attached to the other side of the radiating fin 61, the radiating fin 61 is of a structure with multiple radiating fins, the multiple radiating fins can greatly increase the radiating area of the hot surface of the electric refrigerating element 2, and in addition, the first axial fan 62 is back to the radiating fins of the radiating fin 61 to accelerate air to pass through the radiating fins, so that the heat dissipation is accelerated, and the radiating efficiency of the hot surface of the electric refrigerating element 2 is greatly improved.

In a second embodiment, as shown in fig. 2, the outer heat sink 6 includes a heat pipe 63, a heat dissipation fin 64 and a second axial fan 65; one end of the heat pipe 63 is connected with the hot surface of the electric refrigerating element 2, and the other end is connected with the heat dissipation fin 64, specifically, one end of the heat pipe 63 is fixed on a copper sheet, and the copper sheet is fixed on the hot surface of the electric refrigerating element 2 in a butting manner; the second axial fan 65 is attached to the heat dissipating fins 64. This structure uses the heat pipe 63 to transfer the heat of the hot side of the electric refrigerating element 2 to the heat dissipating fin 64, and the second axial fan 65 blows air against the heat dissipating fin 64 to accelerate the heat dissipation. The heat pipe 63 is a hollow copper pipe with a heat conducting medium, the heat conducting medium in the heat pipe is normally in a liquid state, the heat conducting medium is heated and volatilized into a gas state and flows towards the heat dissipation fins 64, the heat is conducted out at the heat dissipation fins 64 and then condensed into a liquid state, the liquid state flows back to the hot surface of the electric refrigeration element 2, and the heat is continuously absorbed, so that the heat exchange efficiency is high.

In a third embodiment, as shown in fig. 3, the outer heat sink 6 includes a plurality of fins 66 disposed perpendicular to the hot side of the electric refrigerating element 2, and the fin 66 located in the middle is higher, and the height of the fin 66 gradually decreases from the middle to the two sides. In this embodiment, the area of the fin 66 located in the middle is large, the area of the fins 66 located on both sides is small, and the average area of all the fins 66 is much larger than that of a common heat dissipation profile, so that the heat dissipation area of the hot surface is greatly increased, and the heat dissipation efficiency can be greatly improved.

In addition, there may be a plurality of components requiring heat dissipation in the cover 1, such as a main control circuit board for controlling the operation of the projector and other components generating heat may also be installed in the cover 1, so that when there are a plurality of components requiring heat dissipation, all the heat dissipation components should be located on the gas circulation path 11, and the gas in the enclosed space can flow through each component requiring heat dissipation along the gas circulation path 11; in order to ensure the heat dissipation effect of the LCD liquid crystal display 31, the air cooled by the electric cooling element 2 preferentially flows through the LCD liquid crystal display 31, so that the LCD liquid crystal display 31 can dissipate heat preferentially.

In the above embodiments, as shown in fig. 1 to 3, the gas circulation path 11 is an annular single circulation path along which the gas circulates, which is simple and efficient, but in some cases, a plurality of components requiring heat dissipation, including the LCD 31, in the projector cannot be arranged on the same annular path, so it is necessary to make the gas circulation path 11 in a form including a plurality of annular paths, that is: the gas circulation path 11 includes a main path 111 and a plurality of branch paths 112, the leading ends and the trailing ends of all the branch paths 112 are respectively communicated with the trailing end and the leading end of the main path 111, and the electric refrigeration element 2 is disposed on the main path 111. The gas in the enclosed space can flow through the LCD panel 31 along the main path 111 or one of the branch paths 112; each branch path 112 is provided with at least one component to be heat-dissipated.

After being refrigerated by the electric refrigeration element 2 on the main path 111, the gas in the cover body 1 enters the head ends of the branch paths 112 from the tail end of the main path 111, the gas in the multiple paths respectively takes away the heat of the gas by the parts needing to be refrigerated on the branch paths 112 and then enters the head ends of the main path 111 from the tail ends of the branch paths 112 for gathering, the gathered hot gas is cooled by the electric refrigeration element 2 and then enters the next cycle, and the cycle is operated in a reciprocating manner, so that all the parts needing to be refrigerated in the cover body 1 can be effectively refrigerated.

Specifically, as shown in fig. 4, the LED lamp panel 7 and the light funnel 8 are also installed in the cover body 1, and besides the part requiring heat dissipation of the LCD liquid crystal display 31, the LED lamp panel 7 also needs to dissipate heat effectively in the cover body 1, and because the LED lamp panel 7 and the LCD liquid crystal display 31 are respectively installed at two ends of the light funnel 8, they cannot be installed on the same annular path, so that a branch path 112 is respectively installed for both the LED lamp panel 7 and the LCD liquid crystal display 31, one of the branch paths 112, namely the fresnel lens 32 and the narrow channel formed between the light funnels 8, and the other branch path 112 runs along the outer wall of the light funnel 8, and is converged by the large end of the light funnel 8 to the small end of the light funnel 8, and then returns to the large end of the light funnel 8 and the path of the branch path 112 of the LCD liquid crystal display 31. This structure can effectively dispel the heat to LCD liquid crystal display 31 and LED lamp plate 7 simultaneously, and makes the wholeness of projection ray apparatus higher, and the closure is better. In addition, on the basis of this embodiment, if an electric refrigeration component 2 can't satisfy the heat dissipation demand, still can install electric refrigeration component 2 additional in the other positions of the cover body 1, if can add an electric refrigeration component 2 on the cover wall that corresponds to LED lamp plate 7 position.

In a preferred embodiment, a temperature sensor may be additionally installed in the cover 1 for a portion of the LCD liquid crystal display 31, the temperature sensor is electrically connected to a main control circuit board of the projection light machine, and in addition, the electric refrigeration element 2, the circulation fan 4, and the first axial flow fan 62 and the second axial flow fan 65 related in each embodiment are all connected to the main control circuit board, and the main control circuit board may perform servo control on a heat dissipation system of the entire projection light machine according to the temperature collected by the temperature sensor, specifically, the main control circuit board has a controller and a memory, at least a first preset value is stored in the memory, the first preset value corresponds to a temperature threshold of the LCD liquid crystal display 31, generally speaking, the operating temperature of the LCD liquid crystal display 31 needs to be controlled below 80 ℃ and works optimally below 70 ℃, here, the first preset value may be set to 80 ℃, when the controller detects that the operating temperature of the LCD liquid crystal display, the operation power of the electric cooling device 2 is increased and the rotation speeds of the circulation fan 4, the first axial fan 62, the second axial fan 65, etc. are increased to increase the circulation efficiency and the heat dissipation efficiency so as to rapidly decrease the operation temperature of the LCD panel 31 below the first preset value. In addition, other preset values can be stored in the memory, a plurality of temperature intervals are formed among the preset values, the controller can set corresponding operating parameters aiming at the temperature intervals, and the operating parameters relate to the operating power of the electric refrigeration element 2 and the rotating speed of each fan, so that the heat dissipation system can be finely controlled, the heat dissipation effect is guaranteed, and the operating power consumption is reduced.

The utility model discloses a totally enclosed monolithic LCD projection ray apparatus of initiative refrigeration formula encloses out the enclosure space who holds optical assembly through setting up the cover body, can prevent effectively that the dust from getting into optical assembly, and set up electric refrigeration component on the cover wall, electric refrigeration component can initiatively refrigerate and move the heat junction effluvium outside the cover body with the heat of its cold side, and the radiating efficiency is high, has guaranteed that LCD liquid crystal display can work under lower temperature, so can make the projection ray apparatus have very high projection luminance.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An active refrigeration type fully-closed single-chip LCD projection optical machine is characterized by comprising a cover body and at least one electric refrigeration element;

2. The actively-refrigerated, fully-enclosed, monolithic LCD projector as defined in claim 1, wherein at least one circulation fan is further disposed within the housing for assisting in the circulation of gas along the gas circulation path.

3. The active cooling type fully enclosed single-chip LCD projector light machine as claimed in claim 1, wherein the cold side of said electric cooling element is attached with an inner heat sink, the hot side of said electric cooling element is attached with an outer heat sink, and said inner heat sink is installed in said enclosed space.

4. The actively-refrigerated, fully-enclosed, single-chip LCD projector light engine of claim 3, wherein the external heat sink comprises a heat sink and a first axial fan;

5. The active-refrigeration, fully-enclosed, monolithic LCD projector as defined in claim 3, wherein the external heat sink comprises heat pipes, heat fins, and a second axial fan;

6. The active cooling type fully enclosed single-chip LCD projector as claimed in claim 3, wherein the outer heat sink comprises a plurality of fins disposed perpendicular to the hot side of the electric cooling element, and the fins located at the middle are higher and gradually decrease in height from the middle to the fins at both sides.

7. The active-refrigeration fully-enclosed monolithic LCD projector as claimed in claim 1, wherein the gas in the enclosed space can flow through a plurality of components requiring heat dissipation along the gas circulation path, and the gas refrigerated by the electric refrigeration element preferentially flows through the LCD.

8. The actively-refrigerated, fully-enclosed, monolithic LCD projector as defined in claim 1, wherein the gas circulation path includes a main path and a plurality of branch paths, all of the branch paths communicating with the main path;

the electric refrigeration element is disposed on the main path;

9. The actively-refrigerated, fully-enclosed, monolithic LCD projection engine of claim 1, comprising an LED lamp panel, a light funnel; the optical assembly comprises a Fresnel lens which is arranged in parallel with the LCD screen;

10. The actively-refrigerated, fully-enclosed, single-chip LCD projector engine of claim 1, wherein the optical assembly comprises a mirror;