CN210720996U

CN210720996U - Heat dissipation module and projection device

Info

Publication number: CN210720996U
Application number: CN201922101083.4U
Authority: CN
Inventors: 戴嘉鸿; 陈靖玮; 陈致同; 侯凯伦; 蔡德颖
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2019-08-04
Filing date: 2019-11-29
Publication date: 2020-06-09
Anticipated expiration: 2029-11-29
Also published as: CN112327571A

Abstract

The utility model provides a heat dissipation module and projection arrangement. The heat dissipation module is used for dissipating heat of at least one heating element of the projection device. The heat dissipation module comprises a first radiator, a second radiator, a pipeline and at least one fan. The second radiator is arranged opposite to the first radiator. The heating element, the first radiator and the second radiator are connected with each other through a pipeline to form a loop. The working fluid is used for being filled in the pipeline, the working fluid flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator is subjected to heat exchange again through the first radiator and then flows to the heating element for circulating heat dissipation. The fan is arranged between the first radiator and the second radiator. The projection device of the present invention includes the above heat dissipation module, and has a better heat dissipation efficiency.

Description

Heat dissipation module and projection device

Technical Field

The present invention relates to a heat dissipation module and a projection apparatus, and more particularly to a heat dissipation module with a better heat dissipation effect and a projection apparatus using the same.

Background

In a solid state light source projection system, the light source is usually cooled by air. The thermal resistance of the current air-cooled heat dissipation design can be about 0.12 ℃/W. If the heat increases, the thermal resistance drops below 0.1 ℃/W, and heat dissipation must be accomplished using either thermal Cooling (TEC) or water Cooling techniques. The water-cooled heat dissipation has the advantages of low thermal resistance and better heat exchange efficiency than the air-cooled heat dissipation. When space limitation and low thermal resistance requirements exist, a water cooling type heat dissipation design is selected.

The water-cooled heat dissipation system is composed of three fans, a radiator, a pipeline containing water-cooled liquid, a cold plate, a pump and a containing tank, wherein the fans are positioned between the radiator and a heat source, and the heat source is directly contacted with the cold plate. The circulation of the water-cooled heat dissipation system is that firstly, the water-cooled liquid in the holding tank is driven by the pump and then flows through the heat dissipation plate, so that the water-cooled liquid and the air exchange heat to reduce the temperature of the water-cooled liquid. Then, after the water temperature is reduced, the water-cooling liquid with lower temperature flows through the heat source. And then the air enters the accommodating tank after being pressurized by the pump, and enters the radiator again to exchange heat with the outside air. From this, it is understood that the temperature of the water-cooling liquid is the lowest before entering the heat source after heat exchange, and the temperature is the highest after cooling the heat source. The fan draws outside air from the air inlet to cool the radiator, and the air flow at the air outlet of the fan indirectly cools the cold plate, so that the air flow cannot be effectively utilized. In addition, when the temperature of the heat source is raised and controlled to maintain the same temperature of the heat source, the number of fans can be increased, the performance of the pump can be improved, and the volume of the radiator can be increased. Therefore, the volume of the water-cooled heat dissipation system will be increased, and the overall space utilization rate is not good.

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 discloses a to a heat radiation module, can have the radiating efficiency of preferred.

The utility model discloses still be directed against a projection arrangement, it includes foretell radiator module, under the condition that does not increase fan quantity, multiplicable heat radiating area, and the rotational speed of reducible fan, and then the noise of reduction system.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the present invention provides a heat dissipation module for dissipating heat of at least one heating element of a projection apparatus. The heat dissipation module comprises a first radiator, a second radiator, a pipeline and at least one fan. The second radiator is arranged opposite to the first radiator. The heating element, the first radiator and the second radiator are connected with each other through a pipeline to form a loop. The working fluid is used for being filled in the pipeline, the working fluid flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator is subjected to heat exchange again through the first radiator and then flows to the heating element for circulating heat dissipation. The fan is arranged between the first radiator and the second radiator.

In an embodiment of the present invention, the heat dissipation module further includes at least one heat dissipation plate contacting the heat generating element and connected to the pipeline. The working fluid flows into the heat dissipation plate to dissipate heat of the heating element.

In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the present invention provides a projection apparatus, which includes a casing, a projection lens, at least one heat generating element, and a heat dissipating module. The projection lens is jointed with the shell. The heating element is arranged in the shell. The heat dissipation module is disposed in the casing and includes a first heat sink, a second heat sink, a duct and at least one fan. The second radiator and the first radiator are arranged oppositely, and the heating element, the first radiator and the second radiator are connected with each other through a pipeline to form a loop. The working fluid is used for being filled in the pipeline, the working fluid flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator is subjected to heat exchange again through the first radiator and then flows to the heating element for circulating heat dissipation. The fan is arranged between the first radiator and the second radiator.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. The utility model discloses an in the design of heat dissipation module, the second radiator sets up with first radiator relatively, and the fan disposes between first radiator and second radiator, and the configuration of first radiator, fan and second radiator forms sandwich structure promptly. The working fluid in the pipeline flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator flows to the heating element for circulating heat dissipation after heat exchange is carried out again through the first radiator. By means of the two-stage cooling water temperature, the heat dissipation module of the utility model has better heat dissipation efficiency. Additionally, adopt the utility model discloses a radiator module's projection arrangement then can be under the condition that does not increase fan quantity, multiplicable heat radiating area, and the rotational speed of reducible fan, and then the noise of reduction system.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic view of a projection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of a projection apparatus according to another embodiment of the present invention;

fig. 3 is a schematic view of a projection apparatus according to another embodiment of the present invention;

fig. 4 is a schematic view of a projection apparatus according to another embodiment of the present invention;

fig. 5 is a schematic view of a projection apparatus according to another embodiment of the present invention;

fig. 6 is a schematic view of a heat dissipation module and a heating element according to an embodiment of the present invention;

fig. 7 is a schematic view of a heat dissipation module and a heat generating element according to another embodiment of the present invention.

The reference numbers illustrate:

10a, 10b, 10c, 10d, 10 e: a projection device;

100a, 100b, 100c, 100d, 100 e: a housing;

102a, 102b, 102c, 102d, 102 e: an air inlet;

104c, 104 d: an air outlet;

200: a projection lens;

300. 310, 320, 330: a heating element;

400a, 400b, 400 c: a heat dissipation module;

410: a first heat sink;

412: a first air intake side;

414: a first air outlet side;

420: a second heat sink;

422: a second air intake side;

424: a second air outlet side;

430a, 430 b: a pipeline;

440. 442, 444, 446: a fan;

450. 452, 454, 456: a heat dissipation plate;

460: a first drive element;

462: a second drive element;

470. 472: a containing groove;

510. 520, 530: a system fan;

d1, D1', D3, D4: the direction of the air flow;

d2: a projection direction;

f: a fluid;

t1: a first temperature;

t2: a second temperature;

t3: and a third temperature.

Detailed Description

The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is a schematic view of a projection apparatus according to an embodiment of the present invention. Referring to fig. 1, in the present embodiment, a projection apparatus 10a includes a housing 100a, a projection lens 200, at least one heat generating element (schematically illustrated with three

heat generating elements

310, 320, and 330), and a heat dissipating module 400 a. The projection lens 200 is coupled to the housing 100a, and the

heat generating elements

310, 320, and 330 and the heat dissipating module 400a are disposed in the housing 100a, wherein the heat dissipating module 400a is used for dissipating heat of the

heat generating elements

310, 320, and 330. Here, the

heat generating elements

310, 320, 330 are, for example, a laser light source or a light valve, such as a Digital Micromirror Device (DMD) in an optical engine, but not limited thereto.

In detail, the heat dissipation module 400a of the present embodiment includes a first heat sink 410, a second heat sink 420, a duct 430a, and at least one fan (three

fans

442, 444, 446 are schematically illustrated). The second heat sink 420 is disposed opposite to the first heat sink 410, and the

fans

442, 444, 446 are disposed between the first heat sink 410 and the second heat sink 420. That is, as shown in fig. 1, the first heat sink 410, the

fans

442, 444, 446 and the second heat sink 420 are disposed to form a sandwich structure. The

heat generating elements

310, 320, 330, the first heat sink 410 and the second heat sink 420 are connected to each other by a pipe 430a to form a loop. The working fluid F is filled in the pipeline 430a and flows in the pipeline 430a, and after absorbing heat of at least one of the

heating elements

310, 320, 330, the working fluid F firstly flows through the second heat sink 420 for heat exchange and then continuously flows into the first heat sink 410, and the working fluid F flowing into the first heat sink 410 flows to the

heating elements

310, 320, 330 for circulating heat dissipation after again performing heat exchange through the first heat sink 410. That is, the temperature of the working fluid F flowing into the second radiator 420 is greater than the temperature of the working fluid F flowing out of the first radiator 410. Here, the working fluid F is, for example, water, but is not limited thereto.

Furthermore, the casing 100a of the present embodiment has an air inlet 102a at the right side, that is, the air inlet 102a is located at the right side of the casing 100a relative to the projection lens 200, and the first heat sink 410 of the heat dissipation module 400a is disposed corresponding to the air inlet 102 a. The air flow generated by the

fans

442, 444, 446 enters the casing 100a from the air inlet 102a and blows from the first heat sink 410 to the second heat sink 420. Here, the air flow direction D1 of the air inlet 102a is perpendicular to the projection direction D2 of the projection lens 200. More specifically, the first heat sink 410 of the present embodiment includes a first air inlet side 412 and a first air outlet side 414 opposite to each other. The airflow generated by the

fans

442, 444, 446 enters from the first air inlet side 412 of the first heat sink 410 and exits from the first air outlet side 414, and there is a first pressure difference between the first air inlet side 412 and the first air outlet side 414. The second heat sink 420 includes a second air-in side 422 and a second air-out side 424 opposite to each other. The airflow generated by the

fans

442, 444, 446 enters from the second air-inlet side 422 of the second heat sink 420 and exits from the second air-outlet side 424, and there is a second pressure difference between the second air-inlet side 422 and the second air-outlet side 424. Here, the second pressure difference is smaller than the first pressure difference, that is, the pressure drop of the second radiator 420 is lower than the pressure drop of the first radiator 410, whereby the resistance of the

fans

442, 444, 446 can be reduced. It is generally known that the greater the flow resistance, the greater the pressure drop, and factors affecting the pressure drop may also include the density, spacing, or shape of the fins within the heat sink.

In order to improve the heat dissipation efficiency, the heat dissipation module 400a of the present embodiment further includes at least one heat dissipation plate (three

heat dissipation plates

452, 454, 456 are schematically shown) contacting the

heat generating elements

310, 320, 330 and connected to the pipeline 430 a. Here, the

heat dissipation plates

452, 454, 456 directly contact the

heat generating elements

310, 320, 330, respectively, to conduct heat generated by the

heat generating elements

310, 320, 330, and the working fluid F flows into the

heat dissipation plates

452, 454, 456 to dissipate heat of the

heat generating elements

310, 320, 330. The

heat dissipation plates

452, 454, 456 are, for example, a cold plate (cold plate) having heat dissipation fins therein, but are not limited thereto.

In addition, the heat dissipating module 400a of the present embodiment further includes a first driving element 460 disposed between the second heat sink 420 and the

heat generating elements

310, 320, and 330 and connected to the duct 430 a. Here, the first driving element 460 is, for example, a pump, but is not limited thereto. In addition, the heat dissipating module 400a of the present embodiment further includes a receiving groove 470 disposed between the second heat sink 420 and the first driving element 460 and connected to the pipe 430a to receive the working fluid F. Here, the working fluid F in the containing tank 470 circulates in the pipeline 430a through the first driving element 460.

In particular, the working fluid F has a first temperature T1 between the first driving element 460 and the second heat sink 420. The working fluid F has a second temperature T2 between the second radiator 420 and the first radiator 410. The working fluid F has a third temperature T3 between the first heat sink 410 and the heat generating element 310. Preferably, the third temperature T3 is less than the second temperature T2, and the second temperature T2 is less than the first temperature T1. In other words, the highest temperature of the working fluid F is in the conduit 430a between the first driving element 460 and the second radiator 420, and the lowest temperature of the working fluid F is in the conduit 430a between the first radiator 410 and the heat generating element 310, so that the heat of the

heat generating elements

310, 320, 330 can be dissipated by the working fluid F having a lower temperature.

The air flow generated by the

fans

442, 444, 446 of the present embodiment enters the cabinet 100a from the air inlet 102a of the cabinet 100a and blows from the first heat sink 410 to the second heat sink 420. Therefore, the air flows generated by the

fans

442, 444, 446 cool the working fluid F at the second temperature T2 in the first heat sink 410, and perform a heat exchange through the first heat sink 410 to obtain the working fluid F at a temperature lower than the second temperature T2 (i.e., the working fluid F at the third temperature T3 between the first heat sink 410 and the heat generating element 310). Subsequently, the working fluid F having the lowest temperature (i.e., the third temperature T3) flows into the

heat dissipation plates

452, 454, 456 to dissipate heat of the

heat generating elements

310, 320, 330, so as to obtain the working fluid F having the highest temperature (i.e., the first temperature T1), the working fluid F having the first temperature T1 enters the second heat sink 420 and cools the working fluid F having the first temperature T1 and located in the second heat sink 420 through the airflow of the first heat sink 410, and the working fluid F located in the second heat sink 420 is heat-exchanged again so as to obtain the working fluid F having the second temperature T2 (i.e., the working fluid F located between the second heat sink 420 and the first heat sink 410). Thus, the present embodiment uses the two-stage cooling working fluid F, which can effectively increase the heat dissipation area of the heat dissipation module 400a without increasing the number of fans, reduce the rotation speed of the

fans

442, 444, and 446, reduce the system noise in the projection apparatus 10a, and effectively apply the air flow of the

fans

442, 444, and 446.

In short, the projection apparatus 10a of the present embodiment employs a water-cooled heat dissipation system. In the design of the heat dissipation module 400a of the present embodiment, the first heat sink 410, the

fans

442, 444, 446 and the second heat sink 420 are configured to form a sandwich structure, the working fluid F in the duct 430a flows into the first heat sink 410 after flowing through the second heat sink 420 for heat exchange, and the working fluid F flowing into the first heat sink 410 flows to the

heat generating elements

310, 320, 330 for circulation heat dissipation after flowing through the first heat sink 410 for heat exchange again. The heat dissipation module 400a of the present embodiment has a better heat dissipation efficiency due to the two-stage cooling water temperature, and the projection apparatus 10a using the heat dissipation module 400a of the present embodiment can increase the heat dissipation area without increasing the number of fans, and can reduce the rotation speed of the fans, thereby reducing the system noise.

It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

Fig. 2 is a schematic view of a projection apparatus according to another embodiment of the present invention. Referring to fig. 1 and fig. 2, a projection apparatus 10b of the present embodiment is similar to the projection apparatus 10a of fig. 1, and the difference between the two is: the casing 100b of the present embodiment has an air inlet 102b at the left side, that is, the air inlet 102b is located at the left side of the casing 100b relative to the projection lens 200, and the first heat sink 410 of the heat dissipation module 400a is disposed corresponding to the air inlet 102 b. The air flow generated by the

fans

442, 444, 446 enters the casing 100b from the air inlet 102b and blows from the first heat sink 410 to the second heat sink 420. Here, the air flow direction D1' of the air inlet 102b is perpendicular to the projection direction D2 of the projection lens 200.

Fig. 3 is a schematic view of a projection apparatus according to another embodiment of the present invention. Referring to fig. 1 and fig. 3, a projection apparatus 10c of the present embodiment is similar to the projection apparatus 10a of fig. 1, and the difference between the two is: the casing 100c of the present embodiment has an air inlet 102c at the right side and an air outlet 104c at the rear side, i.e. the air outlet 104c and the projection lens 200 are respectively located at two opposite sides of the casing 100 c. Here, the airflow direction D3 of the air outlet 104c is parallel to and opposite to the projection direction D2 of the projection lens 200, but is not limited thereto. In another embodiment, not shown, the airflow direction of the air outlet may be parallel to the airflow direction of the air inlet, which still falls within the protection scope of the present invention. In addition, the projection apparatus 10c of the present embodiment may further include at least one system fan (three

system fans

510, 520, and 530 are schematically illustrated) disposed in the casing 100c and corresponding to the air outlet 104c, so as to bring the waste heat in the projection apparatus 10c to the outside.

Fig. 4 is a schematic view of a projection apparatus according to another embodiment of the present invention. Referring to fig. 2 and fig. 4, the projection apparatus 10d of the present embodiment is similar to the projection apparatus 10b of fig. 2, and the difference between the two is: the casing 100d of the present embodiment has an air inlet 102d at the left side and an air outlet 104d at the rear side, i.e. the air outlet 104d and the projection lens 200 are respectively located at two opposite sides of the casing 100 d. Here, the airflow direction D3 of the air outlet 104D is parallel to and opposite to the projection direction D2 of the projection lens 200, but is not limited thereto. In addition, the projection apparatus 10d of the present embodiment may further include at least one system fan (three

system fans

510, 520, and 530 are schematically illustrated) disposed in the casing 100d and corresponding to the air outlet 104d, so as to bring the waste heat in the projection apparatus 10d to the outside. In another embodiment, not shown, the airflow direction of the air outlet may be parallel to the airflow direction of the air inlet, which still falls within the protection scope of the present invention.

It should be noted that the air inlets 102c and 102d and the

air outlets

104c and 104d in fig. 3 and 4 are designed such that the

projection devices

10c and 10d are suitable for being transversely connected to one or more other projection devices, which can effectively extend the application range of the

projection devices

10c and 10 d.

Fig. 5 is a schematic view of a projection apparatus according to another embodiment of the present invention. Referring to fig. 1 and fig. 5, a projection apparatus 10e of the present embodiment is similar to the projection apparatus 10a of fig. 1, and the difference between the two is: the casing 100e of the present embodiment has an air inlet 102e at the front, that is, the air inlet 102e and the projection lens 200 are located at the same side of the casing 100e, and the airflow direction D4 of the air inlet 102e is parallel to and opposite to the projection direction D2 of the projection lens 200. In another embodiment, not shown, the air inlet can also be disposed at the rear of the casing, which still falls within the protection scope of the present invention.

Fig. 6 is a schematic diagram of a heat dissipation module and a heat generating element according to an embodiment of the present invention. Referring to fig. 1 and fig. 6, a heat dissipation module 400b of the present embodiment is similar to the heat dissipation module 400a of fig. 1, and the difference between the two is: the heat dissipation module 400b of the present embodiment dissipates heat of only one heating element 300 directly contacting the heat dissipation plate 450. After absorbing the heat of the heating element 300, the working fluid F flows through the second heat sink 420 for heat exchange, and then continuously flows into the first heat sink 410, and the working fluid F flowing into the first heat sink 410 flows to the heating element 300 for heat circulation through the first heat sink 410 for heat exchange again. In addition, in the heat dissipation module 400b of the present embodiment, only one fan 440 is disposed between the first heat sink 410 and the second heat sink 420. In addition, the present embodiment does not have a receiving groove, and the working fluid F circulates in the conduit 430b by the driving of the first driving element 460.

Fig. 7 is a schematic view of a heat dissipation module and a heat generating element according to another embodiment of the present invention. Referring to fig. 6 and fig. 7, the heat dissipation module 400c of the present embodiment is similar to the heat dissipation module 400b of fig. 6, and the difference between the two is: the heat dissipation module 400c of the present embodiment further includes a second driving element 462 and a receiving groove 472, wherein the second driving element 462 and the receiving groove 472 are disposed between the first heat sink 410 and the heat generating element 300 and connected to the pipeline 430 b. The receiving groove 472 receives the working fluid F, and the working fluid F circulates in the pipe 430b through the second driving element 462. After absorbing the heat of the heating element 300, the working fluid F flows through the second heat sink 420 for heat exchange, and then continuously flows into the first heat sink 410, and the working fluid F flowing into the first heat sink 410 flows to the heating element 300 for heat circulation through the first heat sink 410 for heat exchange again.

In summary, the embodiments of the present invention have at least one of the following advantages or effects. The utility model discloses an in the design of heat dissipation module, the second radiator sets up with first radiator relatively, and the fan disposes between first radiator and second radiator, and the configuration of first radiator, fan and second radiator forms sandwich structure (sandwich structure) promptly. The working fluid in the pipeline flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator flows to the heating element for circulating heat dissipation after heat exchange is carried out again through the first radiator. By means of the two-stage cooling water temperature, the heat dissipation module of the utility model has better heat dissipation efficiency. Additionally, adopt the utility model discloses a radiator module's projection arrangement then can be under the condition that does not increase fan quantity, multiplicable heat radiating area, and the rotational speed of reducible fan, and then the noise of reduction system.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, 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 of the invention to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the utility model name are only used to assist the searching of the patent documents, and are not used to limit 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.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A heat dissipation module for dissipating heat from at least one heat generating element of a projection apparatus, the heat dissipation module comprising a first heat sink, a second heat sink, a duct, and at least one fan, wherein:

the second radiator and the first radiator are arranged oppositely, the at least one heating element, the first radiator and the second radiator are connected with each other through the pipeline to form a loop, working fluid is filled in the pipeline, the working fluid flows through the second radiator for heat exchange and then flows into the first radiator, and the working fluid flowing into the first radiator for heat exchange again flows to the at least one heating element for circulating heat dissipation through the first radiator; and

the at least one fan is arranged between the first radiator and the second radiator.

2. The thermal module of claim 1, wherein the airflow of the at least one fan is blown from the first heat sink toward the second heat sink.

3. The heat dissipation module of claim 1, wherein the first heat sink includes a first air inlet side and a first air outlet side opposite to each other, the airflow generated by the at least one fan enters from the first air inlet side and exits from the first air outlet side with a first pressure difference therebetween, the second heat sink includes a second air inlet side and a second air outlet side opposite to each other, the airflow generated by the at least one fan enters from the second air inlet side and exits from the second air outlet side with a second pressure difference therebetween, and the second pressure difference is smaller than the first pressure difference.

4. The heat dissipation module of claim 1, further comprising:

a first driving element disposed between the second heat sink and the at least one heating element and connected to the duct.

5. The heat dissipation module of claim 4, further comprising:

and a receiving groove disposed between the second heat sink and the first driving element and connected to the pipe to receive the working fluid, wherein the working fluid in the receiving groove circulates in the pipe through the first driving element.

6. The thermal module of claim 4, wherein the working fluid has a first temperature between the first driving element and the second heat sink, and a second temperature between the second heat sink and the first heat sink, and a third temperature between the first heat sink and the at least one heat generating element, the third temperature being less than the second temperature, and the second temperature being less than the first temperature.

7. The heat dissipation module of claim 4, further comprising:

the second driving element and the containing groove are arranged between the first radiator and the at least one heating element and are connected to the pipeline, wherein the containing groove contains the working fluid, and the working fluid circulates in the pipeline through the second driving element.

8. The heat dissipation module of claim 1, further comprising:

and the at least one heat dissipation plate is in contact with the at least one heating element and is connected to the pipeline, wherein the working fluid flows into the at least one heat dissipation plate to dissipate heat of the at least one heating element.

9. A projection device is characterized by comprising a machine shell, a projection lens, at least one heating element and a heat dissipation module, wherein:

the projection lens is jointed with the shell;

the at least one heating element is arranged in the shell; and

the heat dissipation module is disposed in the casing, and the heat dissipation module includes a first heat sink, a second heat sink, a duct, and at least one fan, wherein:

10. The projection apparatus as claimed in claim 9, wherein the housing has an air inlet, and the first heat sink of the heat dissipation module is disposed corresponding to the air inlet, and the air generated by the at least one fan enters the housing through the air inlet and blows away from the first heat sink toward the second heat sink.

11. The projection apparatus of claim 10, wherein the air inlet has an air flow direction perpendicular to the projection direction of the projection lens.

12. The projection apparatus as claimed in claim 11, wherein the housing further has an air outlet, and an air flow direction of the air outlet is parallel to an air flow direction of the air inlet or parallel to the projection direction of the projection lens.

13. The projection device of claim 12, further comprising:

at least one system fan, it disposes in the said casing and corresponds to the said air outlet arrangement.

14. The projection apparatus of claim 10, wherein the air inlet has an air flow direction parallel to the projection direction of the projection lens.

15. The projection device of claim 9, wherein the heat dissipation module further comprises:

16. The projection apparatus of claim 9, wherein the first heat sink includes a first air inlet side and a first air outlet side opposite to each other, the airflow generated by the at least one fan enters from the first air inlet side and exits from the first air outlet side with a first pressure difference therebetween, and the second heat sink includes a second air inlet side and a second air outlet side opposite to each other, the airflow generated by the at least one fan enters from the second air inlet side and exits from the second air outlet side with a second pressure difference therebetween, and the second pressure difference is smaller than the first pressure difference.

17. The projection device of claim 9, wherein the heat dissipation module further comprises:

the first driving element is arranged between the second radiator and the at least one heating element and is connected with the pipeline.

18. The projection device of claim 17, wherein the heat dissipation module further comprises:

and the accommodating groove is arranged between the second radiator and the first driving element and is connected with the pipeline so as to accommodate the working fluid, wherein the working fluid in the accommodating groove is circulated in the pipeline through the first driving element.

19. The projection apparatus according to claim 17, wherein the working fluid has a first temperature between the first driving element and the second heat sink, and a second temperature between the second heat sink and the first heat sink, and a third temperature between the first heat sink and the at least one heat generating element, the third temperature being less than the second temperature, and the second temperature being less than the first temperature.

20. The projection device of claim 17, wherein the heat dissipation module further comprises:

the second driving element and the containing groove are arranged between the first radiator and the at least one heating element and connected to the pipeline, wherein the containing groove contains the working fluid, and the working fluid circulates in the pipeline through the second driving element.