CN213210698U

CN213210698U - Projector protective box

Info

Publication number: CN213210698U
Application number: CN202021966771.3U
Authority: CN
Inventors: 吴佳政
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-05-14
Anticipated expiration: 2030-09-10
Also published as: TWM608426U

Abstract

A projector protection box is provided, wherein a projector is arranged in the projector protection box and provided with a projection lens and an air outlet, and the projector protection box comprises a box body and a first guide pipe. The box body is provided with a first side wall, a second side wall, a third side wall and a fourth side wall, wherein the second side wall and the fourth side wall are connected to two sides of the first side wall, the third side wall and the first side wall are oppositely connected between the second side wall and the fourth side wall, the first side wall is at least partially formed by transparent glass, and a projection lens of the projector faces the transparent glass. One end of the first flow guide pipe is connected to the air outlet of the projector, and the other end of the first flow guide pipe corresponds to the upper side of the transparent glass and is used for guiding hot air exhausted from the air outlet to the upper side of the transparent glass. The utility model discloses a projector protection box can retrieve the guide with projector exhaust hot-blast and blow towards transparent glass, can ensure the projection quality and have energy environmental protection concept concurrently.

Description

Projector protective box

Technical Field

The present invention relates to a protection box, and more particularly to a projector protection box.

Background

When the projector is used in an extended environment, the projector is usually placed in a protective box to protect and prolong the service life of the projector. According to the environmental requirements, in the areas with excessive temperature difference, high humidity areas, dust falling and foreign matter falling, such as subway environments, the protection box is used for protecting the projector in operation, although the protection box can provide related protection effects, the protection box still has places which are difficult to be thoroughly covered.

Commonly used protective cases can be broadly classified into the following two types: the projector protection box is characterized in that a semi-closed fan cooling type projector protection box is used for cooling a projector in operation in the box by filtering cooling air entering a box body through a filter screen; second, a totally-enclosed projector protection box, which is a projector in operation in a refrigeration equipment cooling box.

However, the above-mentioned shielding box still has drawbacks, such as that the heat energy of the exhaust air of the projector in the box can not be recycled. In addition, the inner layer and the outer layer of the transparent glass with high light transmittance are easy to form fog (condensation phenomenon) due to high and low temperature and space humidity, so that a projection light path is shielded, and the quality of a projected picture image is low.

The background section is only provided to aid in understanding the present invention, and therefore the disclosure in the background section may include some known techniques which do not constitute a part of the knowledge of those skilled in the art. The disclosure in the "background" section does not represent that content or the problems which may be solved by one or more embodiments of the present invention are known or appreciated by those skilled in the art prior to the filing of the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a have economic energy environmental protection concept's projector protective housing concurrently.

The utility model discloses a projector protection box, one of them projector are used for placing in the projector protection box, and the projector has a projection lens and an air outlet, and projector protection box includes a box and a honeycomb duct. The box body is provided with a first side wall, a second side wall, a third side wall and a fourth side wall, wherein the second side wall and the fourth side wall are connected to two sides of the first side wall, the third side wall and the first side wall are oppositely connected between the second side wall and the fourth side wall, the first side wall is at least partially formed by transparent glass, and a projection lens of the projector faces the transparent glass. One end of the first flow guide pipe is connected to the air outlet of the projector, and the other end of the first flow guide pipe corresponds to the upper side of the transparent glass and is used for guiding hot air exhausted from the air outlet to the upper side of the transparent glass.

Based on the above, the utility model discloses a projector protection box can be with the projector exhaust hot-blast recycle again outside, can also prevent to take place the dewfall phenomenon on transparent glass because the inside and outside difference in temperature of box.

Drawings

Fig. 1 is a schematic view of a projector and a projector protection box according to the present invention.

Fig. 2 is a schematic view of fig. 1 from another perspective.

Fig. 3 is a schematic diagram of a filtration module.

Fig. 4 is a schematic view of gas outside the cabinet entering the cabinet via the filter module.

FIG. 5 is a schematic view of a portion of a thermal insulation material covering a box.

Fig. 6 is a schematic view showing the backward flow of moisture in the cabinet.

Detailed Description

In the following detailed description of the embodiments, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration embodiments in which the invention may be practiced. Terms including direction or orientation, such as "top," "bottom," "front," "back," and the like, are used with reference to the orientation of the figure(s) being described. The components of the present invention may be oriented in a number of different directions. Directional or orientational terms are used for purposes of illustration and are not intended to be limiting. On the other hand, the drawings are only schematic and the dimensions of the components may be exaggerated for clarity. It is understood that structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms "connected," "coupled," and "mounted" are used herein to encompass both direct and indirect connections, couplings, and mountings. Similarly, the use of the term "facing" herein encompasses both direct and indirect facing, and the term "adjacent … …" herein includes both direct and indirect "adjacent … …". Thus, the description of an "a" element as directed to a "B" element herein may include instances where the "a" element is directly directed to the "B" element or where one or more other elements are located between the "a" element and the "B" element. In addition, the description of "a" element as being "adjacent" to "B" element herein may include the following: the "a" component is directly "adjacent" to the "B" component or one or more other components are between the "a" and "a" components. The "B" component. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

Fig. 1 is a schematic view of a projector and a projector protection box according to the present invention, and fig. 2 is a schematic view of another view angle of fig. 1. Referring to fig. 1 and fig. 2, a projector protection box 1 of the present invention is used for accommodating and protecting a projector 2 accommodated in the projector protection box 1. As is well known, the projector 2 generally has a projection lens 21 for projecting a projection beam and an air outlet 22 for exhausting hot air inside the projector 2. The projector protection box 1 of the present invention can recycle hot air (waste heat) discharged from the air outlet 22 of the projector 2 while ensuring the picture quality of the projection beam projected by the projection lens 21, and has the concept of economic energy and environmental protection.

Specifically, the projector protection box 1 of the present embodiment includes a box body 10 and a first duct 11. The box 10 has a first sidewall 101, a second sidewall 102, a third sidewall 103 and a fourth sidewall 104, wherein the second sidewall 102 and the fourth sidewall 104 are respectively connected to two sides of the first sidewall 101, and the third sidewall 103 and the first sidewall 101 are oppositely connected between the second sidewall 102 and the fourth sidewall 104. In brief, the first sidewall 101 and the third sidewall 103 face each other, the second sidewall 102 and the fourth sidewall 104 face each other, the projection lens 21 of the projector 2 faces the first sidewall 101, the rear side of the projector 2 corresponds to the third sidewall 103, and the left and right sides of the projector 2 correspond to the second sidewall 102 and the fourth sidewall 104 of the cabinet 10, respectively. In the present embodiment, the first sidewall 101 is at least partially formed by the transparent glass 101a, and the projection lens 21 of the projector 2 faces the transparent glass 101a, so that the projection light beam of the projector 2 can be projected through the transparent glass 101a of the first sidewall 101.

The first sidewall 101 may be formed entirely of the transparent glass 101a, or only the region corresponding to the projection range of the projection light beam may be formed of the transparent glass 101 a. Specifically, the range and the position of the first sidewall 101 formed by the transparent glass 101a can be determined according to actual requirements.

The transparent glass 101a may be a single-layer or double-layer transparent glass. Specifically, a single layer of transparent glass has the advantage of high light transmission, while a double layer of transparent glass has the advantage of temperature isolation. In addition, the transparent glass 101a may have an antistatic function to reduce adhesion of fine dust. Therefore, the cleaning requirements can be reduced, and the cleaning operation is easier.

One end 111 of the first duct 11 is connected to the air outlet 22 of the projector 2 to receive the hot air discharged from the air outlet 22 of the projector 2; the other end 112 of the first duct 11 corresponds to the upper side of the transparent glass 101a, and guides the hot air discharged from the air outlet 22 of the projector 2 to the upper side of the transparent glass 101 a. In this embodiment, the other end 112 of the first duct 11 may be slightly lower than the upper side of the transparent glass 101a and open to the upper side of the transparent glass 101a, so that the hot air guided by the first duct 11 is obliquely blown to the upper side of the transparent glass 101 a; alternatively, the opening of the other end 112 of the first duct 11 may be directed toward the upper side of the transparent glass 101a to blow the hot air. The shape and the arrangement position of the first draft tube 11 may be adaptively changed according to the arrangement position of other components inside the cabinet 10 or the internal structure of the cabinet 10.

The projector protection case 1 further includes a refrigerator 12 disposed at the second side wall 102 of the case 10, wherein the refrigerator 12 is used to produce cool air and supply the cool air into the case 10.

In addition, the projector protection box 1 further includes a second duct 13, and the projector 2 includes an air inlet 23, wherein two ends of the second duct 13 are respectively connected to the refrigerator 12 and the air inlet 23 of the projector 2, and the cold air produced by the refrigerator 12 is guided into the projector 2 through the second duct 13 to dissipate heat inside the projector 2.

The second duct 13 is a flexible tube, and the cabinet 10 further has an angle adjusting mechanism (not shown) for adjusting the tilt angle and the depression angle of the projector 2, wherein the second duct 13 connected between the refrigerator 12 and the projector 2 is a flexible tube, and can be deformed to adapt to the angle change of the projector 2 in response to the adjustment of the tilt angle and the depression angle of the projector 2 without affecting the air guiding function. More specifically, the angle adjustment mechanism (not shown) is, for example, a mechanism that pivotally connects the projector 2 to two opposite sides of the box 10, so that the projector 2 can pivot relative to the box 10 through the mechanism to change the inclination angle and the depression angle of the projector 2.

The projector protection case 1 further includes a pair of first heating members 14 respectively disposed on opposite sides of the transparent glass 101a adjacent to the second sidewall 102 and the fourth sidewall 104, wherein the two first heating members 14 are heating coils attached to the transparent glass 101 a. When the first heating member 14 is energized, the first heating member 14 is heated to heat the transparent glass 101 a.

The projector protection box 1 further comprises a heater 15 disposed in the box body 10, wherein the heater 15 is correspondingly disposed on the lower side of the transparent glass 101a of the box body 10, and the heater 15 is disposed, for example, below the projector 2. The heater 15 is provided at a relatively lower side in the cabinet 10 according to a natural convection phenomenon in which the cold air sinks and the hot air rises, and contributes to the flow of the air in the cabinet 10. The first guide pipe 11, the first heating member 14 and the heater 15 are installed to heat the upper, lower and opposite sides of the transparent glass 101a, thereby preventing the occurrence of the dewing phenomenon on the transparent glass due to the temperature difference between the inside and the outside of the cabinet 10.

Fig. 3 is a schematic diagram of a filtration module. Referring to fig. 1 and 3, the projector protection box 1 further includes a filter module 16 disposed on the fourth sidewall 104, wherein the filter module 16 selectively communicates air inside and outside the box 10. In the present embodiment, the refrigerator 12 is disposed on the second side wall 102 of the cabinet 10 and the filter module 16 is disposed on the fourth side wall 104 of the cabinet 10, so that the phenomenon of weight bias (i.e., weight concentration on one side) caused by disposing the components on the same side of the cabinet 10 can be avoided, and the interference between the components caused by the limited space for disposing the components on the same side can be prevented, and therefore, there is a great choice in selecting the size or shape of the components.

As can be seen from the above, the filter module 16 may be disposed on the second sidewall 102 or the third sidewall 103 under the condition that the space allows and the components are disposed without interfering with each other.

In view of the above, the filter module 16 includes a filter channel 161, at least one pressure regulating valve 162 and at least one filter material 163. In the present embodiment, the filtering channel 161 is installed corresponding to the fourth sidewall 104, and the pressure regulating valves 162 are provided as a pair, and the pressure regulating valves 162 are respectively disposed at two ends of the filtering channel 161, wherein the pressure regulating valve 162 relatively adjacent to the fourth sidewall 104 is a first pressure regulating valve 162a, and the pressure regulating valve 162 relatively far away from the fourth sidewall 104 is a second pressure regulating valve 162 b. The pressure regulating valve 162 may be an electromagnetic valve or an electrically operated valve.

By opening or closing the pressure regulating valve 162, the pressure of the gas inside the case 10 can be adjusted by discharging the gas inside the case 10 or allowing the external gas to enter the case 10.

Incidentally, in order to prevent dust from entering the case 10 and affecting the projection quality, the filter material 163 is disposed in the filter channel 161 to prevent dust particles in the air outside the case 10 from entering the case 10 through the filter channel 161 when the pressure regulating valve 162 is opened. The filter 163 has high filtration properties and can filter dust having a PM of 2.5 or less. The number of the filter members 163 may be a pair, and the filter members are disposed between the first pressure regulating valve 162a and the second pressure regulating valve 162b and are respectively disposed adjacent to the first pressure regulating valve 162a and/or the second pressure regulating valve 162 b. Porous molecular sieve 164, activated carbon 165, or a combination of porous molecular sieve 164 and activated carbon 165 may be further disposed between the filter materials 163.

In the present embodiment, the porous molecular sieve 164 and the activated carbon 165 are simultaneously disposed between the filter members 163, and the filter members 163, the porous molecular sieve 164, the activated carbon 165, and the filter members 163 are sequentially disposed in the filter passage 161 from the second pressure regulating valve 162b toward the first pressure regulating valve 162 a.

Through the arrangement of the filter material 163, the activated carbon 165 and/or the porous molecular sieve 164, organic gas, moisture or liquid can be effectively adsorbed, dust is filtered out, and the organic gas, moisture, liquid and even dust are prevented from entering the box body 10 to influence the projection effect.

In addition, the filter module 16 further includes a second heating member 166 disposed on the filter passage 161 to heat the activated carbon 165. The second heating members 166 may be the same as the first heating members 14, are heating coils, and may be sheet heaters. The second heating member 166 heats the activated carbon 165 to perform a desorption reaction, so that the activated carbon 165 emits moisture.

Alternatively, only the filter material 163 may be disposed in the filter passage 161 to filter out dust. The filter material 163, the porous molecular sieve 164 and/or the activated carbon 165 may be selected according to actual requirements, and the filtering result may be adjusted by controlling the ratio of the filter material 163, the porous molecular sieve 164 and the activated carbon 165 in the filtering channel 161.

The filter material 163, porous molecular sieve 164 and activated carbon 165 are detachably installed in the filter passage 161. Therefore, the filter material 163, the porous molecular sieve 164 and the activated carbon 165 can be replaced when they are not used. In other embodiments, the pressure regulating valve 162 is provided in one, and the pressure regulating valve 162(162a or 162b) is provided at one end of the filtering channel 161, for example, to control the gas to be discharged from the inside of the box 10 or the external gas to enter the box 10.

In addition, the filter module 16 further includes a pressure detector 167a disposed in the tank 10 and coupled to the pressure regulating valve, wherein the pressure detector 167a feeds back the detected pressure value in the tank 10 to control the pressure regulating valve 162. In addition, in order to allow the user to quickly and easily understand the pressure value inside the box 10, the projector protection box 1 may further include a pressure display 167b disposed on the box 10 and coupled to the pressure detector 167a, wherein the pressure display 167b is used to display the pressure value inside the box 10 measured by the pressure detector 167 a.

Pressure display 167b can be integrated with pressure detector 167a as a single module or used as separate components.

In addition, the projector protection box 1 further includes a temperature and humidity detector 168a disposed in the box 10 and coupled to the refrigerator 12, and the temperature and humidity detector 168a feeds back the detected temperature and humidity values in the box 10 to control the operation of the refrigerator 12. Similarly, in order to allow the user to quickly and easily understand the temperature and humidity values in the cabinet 10, the projector protection box 1 may further include a temperature and humidity display 168b disposed on the cabinet 10 and coupled to the temperature and humidity detector 168a, wherein the temperature and humidity display 168b is used to display the temperature and humidity values measured by the temperature and humidity detector 168a in the cabinet 10, and the temperature and humidity display 168b may be integrated with the temperature and humidity detector 168a as a module or used as a separate component.

In the present embodiment, the pressure detector 167a, the pressure display 167b, the temperature and humidity detector 168a, and the temperature and humidity display 168b are disposed on the third sidewall 103, but the present invention is not limited thereto, and the positions of the pressure detector 167a, the pressure display 167b, the temperature and humidity detector 168a, and the temperature and humidity display 168b may be changed according to actual requirements.

When the projector 2 is started in the box 10, the projector 2 generates heat energy, and the second duct 13 guides the cool air produced by the refrigerator 12 into the projector 2 through the air inlet 23 of the projector 2, so that the projector 2 can keep close to an ideal operating temperature for operation.

After the cold air is heated by the internal heat source of the projector 2 and becomes high-temperature hot air, the hot air enters the first duct 11 through the air outlet 22 of the projector 2 and is blown towards the upper side of the transparent glass 101a through the guidance of the first duct 11, so that condensed moisture or mist is not easily generated on the surface of the transparent glass 101a due to temperature difference.

Meanwhile, the first heating member 14 can be further energized to heat both sides of the transparent glass 101a, and the heater 15 can be simultaneously used to heat the air at the bottom layer of the box 10, so that the overall temperature of the first sidewall 101 of the box 10 is increased, thereby preventing the inside and the outside of the transparent glass 101a from being difficult to generate condensed water vapor or mist, achieving the recycling of waste heat, and having the concept of economic energy and environmental protection.

The way of blowing the hot air towards the upper side of the transparent glass 101a through the first flow guide pipe 11 can effectively solve the problem of moisture possibly condensed on the transparent glass 101a, so that the occupied area of the transparent glass 101a on the first side wall 101 can be increased, the infrared receiver of the projector 2 can normally receive the signal transmitted by the user using the infrared remote controller, and the problem that the projector 2 cannot normally receive the signal of the infrared remote controller because the projector is placed in the projector protection box 1 and further the controllability is affected is avoided.

It should be noted that, according to physical principles, the gas expands in volume due to heat, which causes the gas pressure in the fixed container to rise. Therefore, as the hot air exhausted from the projector 2 increases, the temperature in the cabinet 10 of the projector protection case 1 gradually increases, and the gas pressure in the cabinet 10 also increases.

The problem of the increase in the gas pressure in the tank 10 can be solved by providing the pressure regulating valve 162 and the pressure detector 167 a. Specifically, when the gas pressure in the case 10 is greater than the ambient atmospheric pressure (atm), the pressure regulating valve 162 may be fully opened, or the opening degree of the valve may be adjusted depending on the difference between the pressure in the case 10 and the ambient atmospheric pressure, thereby discharging the gas pressure in the case 10, and at the same time, the water gas in the case 10 may be discharged through the pressure regulating valve 162. Therefore, it can be known that the purpose of pressure relief can be achieved without additionally arranging an exhaust device or an air draft device at the box body 10 of the projector protection box 1.

Incidentally, the position of the pressure regulating valve 162 should be relatively far away from the transparent glass 101a, and for the embodiment, the pressure regulating valve 162 is disposed at the fourth sidewall 104 relatively close to the third sidewall 103 and below the projector 2, so that the hot air blown to the transparent glass 101a can be discharged after forming a complete convection circulation distribution inside the cabinet 10.

Fig. 4 is a schematic view of gas outside the cabinet entering the cabinet via the filter module. Referring to fig. 4, when the general ambient atmospheric pressure (atm) is greater than the pressure inside the case 10, the external air can enter the case 10 through the opening of the pressure regulating valve 162. Specifically, the first pressure regulating valve 162a and the second pressure regulating valve 162b are opened, and the outside air enters the filter passage 161 through the first pressure regulating valve 162a, is primarily screened off by the filter 163 having high filterability, is filtered off by the activated carbon 165 and the porous molecular sieve 164 to remove moisture, organic gases, and the like, is filtered off again by the filter 163 to remove dust, and then enters the case 10 through the second pressure regulating valve 162 b.

Incidentally, when the intake air and the exhaust air of the case 10 pass through the same filter module 16, the air in the case 10 is exhausted to the outside of the case 10, and passes through the filter 163, the porous molecular sieve 164 and the activated carbon 165, so that it is ensured that the air exhausted to the outside of the case 10 does not secondarily pollute the environment. In addition, two or more sets of filter modules 16 may be provided in the case 10 so that air intake and air exhaust of the case 10 can be performed through the different filter modules 16, respectively.

Alternatively, the gas within the enclosure 10 may be atmospheric air in the general environment, or the gas within the enclosure 10 may be a clean, dry inert gas such as nitrogen, or other gas. The present embodiment does not limit the gas in the housing 10 to be atmospheric air.

Fig. 5 is a schematic view of a portion of the insulation-coated box body, and fig. 6 is a schematic view of the moisture in the box body flowing backward. Referring to fig. 5 and fig. 6, the projector protection box 1 further includes a heat insulation material 17 covering at least a part of the box 10, and the heat insulation material 17 covers the outside of the box 10 around the corresponding transparent glass 101 a. By providing the heat insulating material 17, the temperature of the corresponding region can be preferentially maintained, and the moisture in the housing 10 can flow backward (toward the third side wall 103) and downward, so that the occurrence of condensation on the surface of the transparent glass 101a can be more effectively prevented, and the gas fluidity due to the gas temperature and the pressure difference can be maintained.

In addition, the gas flowing backward and downward may be partially condensed to remove water through an air inlet (not shown) leading back to the refrigerator 12, and a part of the gas may be discharged out of the cabinet 10 through the filter module 16.

To sum up, the utility model discloses a projector protection box can retrieve the guide with projector exhaust hot-blast and blow towards clear glass to prevent to take place the dewfall phenomenon on clear glass because the inside and outside difference in temperature of box, consequently can ensure the projection quality and have energy environmental protection concept concurrently.

In addition, because the dewing phenomenon of the transparent glass can be effectively solved, the occupied area of the transparent glass on the first side wall 101 can be effectively increased, and the problem that the projector cannot normally receive the infrared remote controller signal and further influences the controllability can be avoided.

Moreover, the filter module can be arranged to adjust the pressure inside the box body through the gas inlet and outlet box body, and the gas discharged outside the box body can be prevented from secondary pollution to the environment.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereto, and all the simple equivalent changes and modifications made according to the claims and the contents of the present invention are still included in the scope of the present invention. Moreover, it is not necessary for any embodiment or claim to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the utility model name are only used for assisting the retrieval of the patent documents, and are not used for limiting the scope of the invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Description of reference numerals:

projector protective box

10: box body

101 first side wall

101a transparent glass

102 second side wall

103 third side wall

104 fourth side wall

11: the first flow guide pipe

111: one end

112 the other end

12: refrigerator

13: second flow guide pipe

14 first heating element

15: heater

16 filtering module

161 filtration channel

162 pressure regulating valve

162a first pressure regulating valve

162b second pressure regulating valve

164 porous molecular sieves

165 activated carbon

166 second heating element

167a pressure detector

167b pressure display

168a temperature and humidity detector

168b temperature and humidity display

17 heat insulation material

2: projector

21 projection lens

22: air outlet

23, air inlet.

Claims

1. The utility model provides a projector protection case, wherein the projector is placed in the projector protection case, the projector has projection lens and air outlet, its characterized in that, projector protection case includes box and first honeycomb duct, wherein:

the box body is provided with a first side wall, a second side wall, a third side wall and a fourth side wall, wherein the second side wall and the fourth side wall are connected to two sides of the first side wall, the third side wall and the first side wall are connected between the second side wall and the fourth side wall in an opposite mode, the first side wall is at least partially formed by transparent glass, and the projection lens of the projector faces the transparent glass; and

one end of the first flow guide pipe is connected to the air outlet of the projector, and the other end of the first flow guide pipe corresponds to the upper side of the transparent glass and is used for guiding hot air exhausted from the air outlet to the upper side of the transparent glass.

2. The projector protection case of claim 1, further comprising a refrigerator disposed on one of the second, third, and fourth sidewalls of the case.

3. The projector protection box of claim 2, further comprising a second duct, wherein the projector comprises an air inlet, both ends of the second duct are connected to the cooler and the air inlet of the projector, respectively, and the cooler is configured to guide the discharged cool air to the projector through the second duct.

4. The projector protection case as claimed in claim 1, further comprising a pair of first heating members respectively disposed at opposite sides of the transparent glass adjacent to the second side wall and the fourth side wall.

5. The projector protection box of claim 1, further comprising a heater provided in the case and corresponding to a lower side of the transparent glass of the case.

6. The projector protection box of claim 1, further comprising a filter module disposed on the box body for selectively communicating air inside and outside the box body.

7. The projector protection box of claim 6, wherein the filter module comprises:

a filter channel installed in one of the second sidewall, the third sidewall and the fourth sidewall;

at least one pressure regulating valve arranged at the tail end of the filtering channel; and

at least one filter material filled in the filter channel.

8. The projector protection box of claim 7, wherein the filter module further comprises a pressure detector disposed in the box and coupled to the at least one pressure regulating valve, the pressure detector feeding back a detected pressure value in the box to control the pressure regulating valve.

9. The projector protection box of claim 7, wherein said at least one filter material is provided in a pair, and said filter module further comprises a porous molecular sieve provided in said filter passage and located between said pair of filter materials.

10. The projector protection box of claim 7, wherein the at least one filter material is provided in a pair, and the filter module further comprises activated carbon provided in the filter channel and located between the pair of filter materials.

11. The projector protection cabinet of claim 10, wherein the filter module further comprises a second heating member disposed on the filter passage to heat the activated carbon.

12. The projector protection box of claim 7, wherein said at least one filter material is provided in a pair number, and said filter module further comprises a porous molecular sieve and activated carbon provided in said filter passage between said pair of filter materials.

13. The projector protection case as claimed in claim 12, wherein the at least one pressure regulating valve is provided in a pair in number, which are respectively provided at both ends of the filtering passage, and the pair of filter materials, the porous molecular sieve, and the activated carbon are located between the pair of pressure regulating valves.

14. The projector protection case of claim 1, further comprising a thermal insulation material covering at least a part of the case.

15. The projector protection box of claim 14, wherein the thermal insulation material covers the exterior of the box body around the transparent glass.

16. The projector protection case of claim 1, wherein the first sidewall is formed at least in part from a single layer or a double layer of clear glass.

17. The projector protection box of claim 8, further comprising a pressure display disposed in the box and coupled to the pressure detector, wherein the pressure display is configured to display a pressure value in the box.

18. The projector protection box of claim 2 further comprising a temperature and humidity detector disposed in the box and coupled to the refrigerator, wherein the temperature and humidity detector feeds back the detected temperature and humidity values in the box to control the refrigerator.

19. The projector protection box of claim 18, further comprising a temperature and humidity display disposed on the box and coupled to the temperature and humidity detector, wherein the temperature and humidity display is configured to display a temperature value and a humidity value inside the box.