Projection equipment with temperature maintaining system

Abstract

The invention relates to the technical field of projection equipment, in particular to projection equipment with a temperature maintaining system, which comprises a projection equipment body, reinforced heat dissipation holes are symmetrically formed in the two sides of the lower end of the projection equipment body, and matched bearing rods are symmetrically and fixedly arranged on the two sides of the lower end of the projection equipment body; heat dissipation air outlet channels are symmetrically formed in the two sides of the projection equipment body, movable matching cavities are further formed in the two sides of the projection equipment body at the same time, an air inlet pipeline is arranged on the projection equipment, air inlet is achieved through the air inlet pipeline, and when the projection equipment is in a non-working state, the air inlet pipeline can be closed under the action of a movable closing plate, so that the air inlet pipeline is closed; in this way, external dust can be prevented from entering the air inlet pipeline to be accumulated on the dustproof plate, when the dustproof plate needs to be cleaned, the movable air inlet pipe can be disassembled only by oppositely pushing the two locking connecting plates at the same time, then the dustproof net can be rapidly taken down to be cleaned, and the dustproof device is quite convenient and rapid to use.

Description

Technical Field

[0001] The present invention relates to the technical field of projection equipment, in particular to a projection equipment with a temperature maintaining system. Background Art

[0002] Projection equipment is an optical instrument that uses optical elements to magnify the outline of a workpiece and project it onto a screen. It is widely used in various occasions such as homes, offices, schools, and entertainment venues. The normal operation of the projection equipment is achieved through the coordinated work of its internal electrical components. The projection equipment will generate more heat during operation. The heat needs to be dissipated in time to ensure the safe operation of the projection equipment, so that the interior of the projection equipment maintains a relatively low operating temperature. The temperature maintenance method usually adopted is to dissipate the heat inside through a cooling fan. An air inlet and an air outlet are provided on the projection equipment. At the same time, dustproof nets are respectively provided at the air inlet and the air outlet to prevent external dust and impurities from entering the interior of the projection equipment. In order to ensure the smoothness of ventilation, the dustproof net needs to be disassembled and cleaned regularly. The dustproof net is generally fixed and installed by screws, which makes the installation and removal of the dustproof net more troublesome and inconvenient. Regardless of whether the projection equipment is in working state, the dustproof net is always exposed to the external environment, which also makes it easier to accumulate more dust on the dustproof net, which invisibly increases the cleaning frequency of the dustproof net. Moreover, the dustproof net set at the air outlet will also affect the heat dissipation efficiency to a certain extent. Summary of the invention

[0003] The object of the present invention is to provide a projection device with a temperature maintaining system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A projection device with a temperature maintenance system comprises a projection device body, wherein both sides of the lower end of the projection device body are symmetrically provided with enhanced heat exhaust holes, and both sides of the lower end of the projection device body are symmetrically fixed with matching bearing rods, both sides of the projection device body are symmetrically provided with heat dissipation air outlet channels, and both sides of the projection device body are also provided with mobile matching cavities, the mobile matching cavities are connected with the heat dissipation air outlet channels, and the cavity opening of the mobile matching cavity is located on the rear end surface of the projection device body, a matching bearing plate is fixedly provided beside the cavity opening of the mobile matching cavity, and a guide matching vertical plate is fixedly provided on the matching bearing plate Rod, a top limit block is fixedly provided on the upper end of the guide matching vertical rod, a sealing covering plate is fixedly installed on the projection device body, a wind cylinder is fixedly provided on the inner end surface of the sealing covering plate, and an air inlet duct is fixedly provided on the outer end surface of the sealing covering plate, the air inlet duct is connected with the wind cylinder, and positioning grooves are symmetrically provided on both sides of the lower port of the air inlet duct, and connecting matching frames are fixedly provided on both sides of the air inlet duct, fixed connecting holes are provided on the connecting matching frames, and a downward extended contact plate is fixedly provided on the lower end of the connecting matching frames, and a follow-up opening and closing temperature protection mechanism is installed on the projection device body.

[0005] Preferably, the follow-up opening and closing temperature maintaining mechanism includes a cooling fan, a controller, a temperature sensor, a movable air inlet duct, a dustproof plate, a movable closing plate and a matching closing plate. The cooling fan is fixedly installed in the wind tube, the controller is installed on the inner end surface of the sealing covering plate, and the temperature sensor is also installed on the inner end surface of the sealing covering plate.

[0006] Preferably, the movable air inlet pipe is installed at the lower port of the air inlet duct, and an installation groove is opened on the inner side of the upper end of the movable air inlet pipe, a dustproof plate is inserted in the installation groove, and positioning plug plates are symmetrically fixed on both sides of the upper end of the movable air inlet pipe, and when the movable air inlet pipe is installed on the air inlet duct, the positioning plug plates are inserted in the positioning grooves.

[0007] Preferably, a mounting hole is opened on the movable air inlet duct on the lower side of the positioning plug plate, and a mounting movable rod is inserted into the mounting hole. A locking connecting plate is fixedly provided at one end of the mounting movable rod, and the locking connecting plate is located on the outside of the movable air inlet duct, and a locking connecting block is fixedly provided at the upper end of the locking connecting plate.

[0008] Preferably, a limiting end block is fixedly provided at the other end of the movable mounting rod, the limiting end block is located inside the movable air inlet duct, and a first connecting spring is sleeved on the movable mounting rod, an inner supporting plate is fixedly provided inside the movable air inlet duct, an inner supporting rod is fixedly provided on the lower end surface of the inner supporting plate, a sealing plug is fixedly provided at the lower end of the inner supporting rod, and a supporting strip is fixedly provided at the lower pipe opening of the movable air inlet duct.

[0009] Preferably, a movable closing plate is installed inside the movable air inlet duct, an air inlet hole is opened on the movable closing plate, the air inlet hole cooperates with the blocking block, and the diameter of the air inlet hole is equal to the diameter of the blocking block, and matching contact frames are symmetrically fixed on both sides of the movable closing plate, and the matching contact frame portion is located on the outside of the movable air inlet duct.

[0010] Preferably, the mating closing plate is inserted into the movable mating cavity, and when the cooling fan is in a non-working state, the mating closing plate closes the cooling air outlet channel, and an exhaust channel is opened on the mating closing plate, and a connecting strip is fixedly arranged on one side of the exhaust channel, and a movable connecting rod is hinged on the connecting strip.

[0011] Preferably, a blocking strip is hinged at the lower end of the movable connecting rod, and the blocking strip is located at the lower end of the projection equipment body. When the cooling fan is in a non-working state, the blocking strip blocks the enhanced heat exhaust hole, and a raised connecting frame is fixedly provided on the blocking strip, and the raised connecting frame is hinged to the lower end of the movable connecting rod. A limited matching hole is provided on the blocking strip, and a matching bearing rod is inserted into the limited matching hole.

[0012] Preferably, a connecting block is fixedly provided at one end of the matching closing plate, a matching connecting frame is fixedly provided at the lower end of the connecting block, a driving connecting rod is hinged on the matching connecting frame, and a contact movable plate is hinged at the lower end of the driving connecting rod.

[0013] Preferably, the contact movable plate is sleeved on the guide matching upright rod, and a second connecting spring is also sleeved on the guide matching upright rod, and the second connecting spring is located on the upper side of the contact movable plate.

[0014] Compared with the prior art, the invention has the following advantages: 1. The projection device is provided with an air inlet duct, through which air is supplied. When the projection device is not in operation, the air inlet duct can be closed by the movable closing plate, thereby preventing external dust from entering the air inlet duct and accumulating on the dustproof plate. When the dustproof plate needs to be cleaned, the movable air inlet duct can be disassembled by simply pushing the two locking connecting plates toward each other at the same time, and then the dustproof net can be quickly removed for cleaning, which is very convenient and quick.

[0015] 2. When the projection equipment is working, the cooling fan is working, which will form a negative pressure in the air inlet duct, and then the movable closing plate will move further into the inside of the air inlet duct, which will cause the air inlet hole and the blocking block to be misaligned, so that the air inlet duct is in an open state. The air enters from the gap between the air inlet hole and the inner support rod, and enters the air inlet duct through the gap between the two, which can preliminarily filter the impurities in the air and prevent larger impurities from entering the air inlet duct.

[0016] 3. In addition, when the movable closing plate moves, it will drive the matching closing plate to move, thereby aligning the exhaust duct with the heat dissipation outlet duct, so that the heat inside the projection device body can be dissipated from the heat dissipation outlet duct. At the same time, as the matching closing plate moves, it will also drive the blocking strip to move downward, thereby making the enhanced heat exhaust hole also in an open state, thereby enhancing the exhaust efficiency of the heat flow inside the projection device body, so that the inside of the projection device body can always maintain a low temperature to ensure its normal operation. Moreover, since the air inside the projection device body flows outward, external impurities and dust will not enter the interior of the projection device body from the heat dissipation outlet duct and the enhanced heat exhaust holes during the flow process. When the projection device is in a non-working state, there is no need to dissipate heat. At this time, the heat dissipation outlet duct and the enhanced heat exhaust holes are in a closed state, and dust and impurities will not enter, thereby avoiding the use of dustproof nets and improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A first-person perspective diagram of the projection equipment assembly.

[0018] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle.

[0019] Figure 3 A second-view diagram of the projection device assembly.

[0020] Figure 4 Schematic diagram of the third perspective of the projection equipment assembly.

[0021] Figure 5 It is a schematic diagram of the structure of the projection device body.

[0022] Figure 6 Schematic diagram of the structure of the sealing cover plate.

[0023] Figure 7 This is a first-person perspective schematic diagram of the movable air inlet duct assembly.

[0024] Figure 8 A second perspective diagram of the movable air inlet duct assembly.

[0025] Fig. 9This is a schematic diagram of the internal assembly of the movable air inlet duct.

[0026] Fig.10 It is a structural schematic diagram of the movable air inlet duct.

[0027] Fig.11 A schematic diagram of the structure to match the closed plate.

[0028] Fig.12 Schematic diagram of the temperature maintenance control system.

[0029] In the figure: 1. Projection equipment body; 11. Strengthen heat exhaust hole; 12. Matching bearing rod; 13. Heat dissipation air outlet channel; 14. Moving matching cavity; 15. Matching bearing plate; 16. Guide matching vertical rod; 17. Top limit block; 2. Sealing cover plate; 21. Air duct; 22. Air inlet duct; 23. Positioning groove; 24. Connecting matching frame; 25. Fixed connecting hole; 26. Lower extension contact plate; 3. Cooling fan; 4. Controller; 5. Temperature sensor; 6. Movable air inlet duct; 61. Installation groove; 62. Positioning plug plate; 63. Installation plug hole; 631. Install movable rod; 632 , locking connecting plate; 633, locking connecting block; 634, limiting end block; 635, first connecting spring; 64, inner supporting plate; 65, inner supporting rod; 66, blocking plug block; 67, supporting strip plate; 7, dustproof plate; 8, movable closing plate; 81, air inlet hole; 82, matching contact frame; 9, matching closing plate; 91, exhaust duct; 92, connecting strip; 93, movable connecting rod; 94, blocking strip; 95, raised connecting frame; 96, limiting matching hole; 97, connecting block; 98, matching connecting frame; 99, driving connecting rod; 991, contact movable plate; 992, second connecting spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 12 , the present invention provides a technical solution: A projection device with a temperature maintenance system comprises a projection device body 1, wherein both sides of the lower end of the projection device body 1 are symmetrically provided with enhanced heat exhaust holes 11, and both sides of the lower end of the projection device body 1 are symmetrically fixed with matching bearing rods 12, both sides of the projection device body 1 are symmetrically provided with heat dissipation air outlet channels 13, and both sides of the projection device body 1 are also provided with movable matching cavities 14, the movable matching cavities 14 are connected with the heat dissipation air outlet channels 13, and the cavity opening of the movable matching cavity 14 is located on the rear end surface of the projection device body 1, a matching bearing plate 15 is fixedly provided beside the cavity opening of the movable matching cavity 14, and a guide matching vertical rod 1 is fixedly provided on the matching bearing plate 15 6. A top limit block 17 is fixedly provided at the upper end of the guide matching upright 16, a sealing cover plate 2 is fixedly installed on the projection device body 1, a wind tube 21 is fixedly provided on the inner end surface of the sealing cover plate 2, and an air inlet duct 22 is fixedly provided on the outer end surface of the sealing cover plate 2, the air inlet duct 22 is connected with the wind tube 21, and positioning grooves 23 are symmetrically provided on both sides of the lower port of the air inlet duct 22, and connecting matching frames 24 are also fixedly provided on both sides of the air inlet duct 22, a fixing hole 25 is provided on the connecting matching frame 24, and a lower extension contact plate 26 is fixedly provided at the lower end of the connecting matching frame 24, and a follow-up opening and closing temperature protection mechanism is installed on the projection device body 1.

[0032] The follow-up opening and closing temperature maintaining mechanism includes a cooling fan 3, a controller 4, a temperature sensor 5, a movable air inlet pipe 6, a dustproof plate 7, a movable closing plate 8 and a matching closing plate 9. The cooling fan 3 is fixedly installed in the air duct 21, the controller 4 is installed on the inner end surface of the sealing covering plate 2, and the temperature sensor 5 is also installed on the inner end surface of the sealing covering plate 2.

[0033] The movable air inlet pipe 6 is installed at the lower port of the air inlet duct 22, and an installation groove 61 is opened on the inner side of the upper end of the movable air inlet pipe 6, and a dustproof plate 7 is inserted in the installation groove 61. Positioning plug plates 62 are symmetrically fixed on both sides of the upper end of the movable air inlet pipe 6, and when the movable air inlet pipe 6 is installed on the air inlet duct 22, the positioning plug plates 62 are inserted in the positioning grooves 23, and the size of the positioning plug plates 62 is equal to the size of the positioning grooves 23.

[0034] An installation socket 63 is provided on the movable air inlet pipe 6 on the lower side of the positioning plug plate 62, and an installation movable rod 631 is inserted into the installation socket 63. A locking connecting plate 632 is fixedly provided at one end of the installation movable rod 631. The locking connecting plate 632 is located on the outside of the movable air inlet pipe 6, and a locking connecting block 633 is fixedly provided at the upper end of the locking connecting plate 632. When the movable air inlet pipe 6 is installed on the air inlet duct 22, the locking connecting block 633 is inserted in the fixed connecting hole 25.

[0035] A limiting end block 634 is fixedly provided at the other end of the movable rod 631, and the limiting end block 634 is located inside the movable air inlet duct 6, and a first connecting spring 635 is sleeved on the movable rod 631, and the two ends of the first connecting spring 635 are respectively welded to the inner wall of the movable air inlet duct 6 and the limiting end block 634, an inner supporting plate 64 is fixedly provided inside the movable air inlet duct 6, an inner supporting rod 65 is fixedly provided on the lower end surface of the inner supporting plate 64, a blocking plug 66 is fixedly provided on the lower end of the inner supporting rod 65, and the diameter of the blocking plug 66 is larger than the diameter of the inner supporting rod 65, and a supporting strip plate 67 is fixedly provided at the lower pipe opening of the movable air inlet duct 6.

[0036] A movable closing plate 8 is installed inside the movable air inlet duct 6. An air inlet hole 81 is opened on the movable closing plate 8. The air inlet hole 81 cooperates with the blocking block 66, and the diameter of the air inlet hole 81 is equal to the diameter of the blocking block 66. Matching contact frames 82 are symmetrically fixed on both sides of the movable closing plate 8. Part of the matching contact frame 82 is located on the outside of the movable air inlet duct 6. In addition, the supporting strip 67 supports the movable closing plate 8. The side wall of the movable closing plate 8 contacts the inner wall of the air inlet duct 22.

[0037] The matching closing plate 9 is inserted in the movable matching cavity 14. When the cooling fan 3 is in a non-working state, the matching closing plate 9 closes the cooling air outlet channel 13, and an exhaust channel 91 is opened on the matching closing plate 9. A connecting strip 92 is fixedly arranged on one side of the exhaust channel 91. A movable connecting rod 93 is hinged on the connecting strip 92, and the connecting strip 92 is inserted in the cooling air outlet channel 13.

[0038] A blocking strip 94 is hinged at the lower end of the movable connecting rod 93, and the blocking strip 94 is located at the lower end of the projection device body 1. When the cooling fan 3 is in a non-working state, the blocking strip 94 blocks the enhanced heat exhaust hole 11, and a protruding connecting frame 95 is fixedly provided on the blocking strip 94, and the protruding connecting frame 95 is hinged to the lower end of the movable connecting rod 93. A limited matching hole 96 is provided on the blocking strip 94, and a matching bearing rod 12 is inserted into the limited matching hole 96.

[0039] A connecting block 97 is fixedly provided at one end of the matching closing plate 9, a matching connecting frame 98 is fixedly provided at the lower end of the connecting block 97, a driving connecting rod 99 is hinged on the matching connecting frame 98, and a contact movable plate 991 is hinged at the lower end of the driving connecting rod 99.

[0040] The contact movable plate 991 is sleeved on the guide matching upright 16, and the contact movable plate 991 can move along the guide matching upright 16. A second connecting spring 992 is also sleeved on the guide matching upright 16. The second connecting spring 992 is located on the upper side of the contact movable plate 991, and the two ends of the second connecting spring 992 are respectively welded to the contact movable plate 991 and the top limit block 17.

[0041] When the projection device is working, the cooling fan 3 also works to dissipate heat inside the projection device body 1. When the cooling fan 3 rotates, negative pressure is generated in the air inlet duct 22, and the movable closing plate 8 can be further moved into the air inlet duct 22 under the action of the negative pressure. As the movable closing plate 8 moves, the air inlet hole 81 and the blocking block 66 are misaligned, so that the blocking block 66 is no longer inserted into the air inlet hole 81. In this way, air can enter the air inlet duct 22 from the gap between the air inlet hole 81 and the inner support rod 65. Under the action of the gap between the air inlet hole 81 and the inner support rod 65, the air entering the air inlet duct 22 can be initially filtered, which can prevent larger impurities from entering the air inlet duct. When the cooling fan 3 is not in operation, the movable closing plate 8 is blocked at the mouth of the air inlet duct 22, so that dust can be prevented from entering the air inlet duct 22 and accumulating on the dust proof plate 7. When the dust proof plate 7 needs to be removed for cleaning, the two locking connecting plates 632 are pushed toward each other at the same time, so that the locking connecting block 633 on the locking connecting plate 632 exits the fixed connecting hole 25. In this way, the movable air inlet duct 6 is in an unlocked state, which can be removed from the air inlet duct 22, and then the dust proof plate 7 can be quickly taken out. It is very convenient and quick. When installing the movable air inlet duct 6, the dust proof plate 7 is inserted into the installation groove 61, and the two locking connecting plates are pushed toward each other at the same time. The movable air inlet duct 6 is pushed upwards so that the locking connecting block 633 contacts the downwardly extending contact plate 26 until the locking connecting block 633 is aligned with the fixed connecting hole 25. Under the action of the first connecting spring 635, the locking connecting block 633 is inserted into the fixed connecting hole 25 to realize the fixed installation of the movable air inlet duct 6. When the movable air inlet duct 6 is installed, the part of the matching contact frame 82 on the outside of the movable air inlet duct 6 is on the lower side of the contact movable plate 991 and contacts the contact movable plate 991. In addition, when the movable closing plate 8 is moved under the action of the negative pressure, the contact movable plate 991 is pushed upwards under the action of the matching contact frame 82. 91 moves upward, and the connecting rod 99 is driven to push the matching sealing plate 9 to move further into the movable matching cavity 14. As the matching sealing plate 9 moves, the exhaust passage 91 is aligned with the heat dissipation air outlet passage 13, so that the interior of the projection device body 1 is connected with the outside, so that the heat inside it can be dissipated. In addition, as the matching sealing plate 9 moves, the movable connecting rod 93 pushes the blocking strip 94 to move downward, so that it no longer blocks the enhanced heat exhaust hole 11. In this way, with the use of the enhanced heat exhaust hole 11, the heat inside the projection device body 1 can be dissipated promptly and quickly. In addition, when the projection device is not in a working state, the matching sealing plate 9 blocks the heat dissipation air outlet passage 13.The blocking strip 94 blocks the enhanced heat exhaust hole 11, which can prevent external dust from entering the interior of the projection device body 1 through the heat dissipation air outlet channel 13 and the enhanced heat exhaust hole 11. When the projection device is in working state, the hot air inside it is discharged outward through the heat dissipation air outlet channel 13 and the enhanced heat exhaust hole 11, that is, the air flows outward from the interior of the projection device body 1, which can effectively prevent the entry of external dust, and also avoid the use of dustproof nets, thereby improving the heat dissipation effect.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A projection device with a temperature maintenance system, comprising a projection device body (1), characterized in that: The lower end of the projection device body (1) is symmetrically provided with enhanced heat dissipation holes (11), and the lower end of the projection device body (1) is also symmetrically provided with matching bearing rods (12), and the lower end of the projection device body (1) is also symmetrically provided with heat dissipation air outlet channels (13), and the projection device body (1) is also provided with movable matching cavities (14), the movable matching cavities (14) are connected with the heat dissipation air outlet channels (13), and the cavity opening of the movable matching cavity (14) is located on the rear end surface of the projection device body (1), and a matching bearing plate (15) is fixedly provided beside the cavity opening of the movable matching cavity (14), and a guide matching vertical rod (16) is fixedly provided on the matching bearing plate (15), and the upper end of the guide matching vertical rod (16) is fixedly provided. A top stop block (17) is provided, a sealing cover plate (2) is fixedly mounted on the projection device body (1), a wind tube (21) is fixedly mounted on the inner end surface of the sealing cover plate (2), and an air inlet duct (22) is fixedly mounted on the outer end surface of the sealing cover plate (2), the air inlet duct (22) is connected to the wind tube (21), and positioning grooves (23) are symmetrically provided on both sides of the lower end of the air inlet duct (22), and connecting and matching frames (24) are fixedly mounted on both sides of the air inlet duct (22), a fixing hole (25) is provided on the connecting and matching frame (24), and a downward extension contact plate (26) is fixedly mounted on the lower end of the connecting and matching frame (24), and a follow-up opening and closing temperature protection mechanism is mounted on the projection device body (1).

2. The projection device with a temperature maintenance system according to claim 1, characterized in that: The follow-up opening and closing temperature maintaining mechanism comprises a cooling fan (3), a controller (4), a temperature sensor (5), a movable air inlet pipe (6), a dustproof plate (7), a movable closing plate (8) and a matching closing plate (9); the cooling fan (3) is fixedly mounted in the air duct (21); the controller (4) is mounted on the inner end surface of the sealing cover plate (2); and the temperature sensor (5) is also mounted on the inner end surface of the sealing cover plate (2).

3. The projection device with a temperature maintenance system according to claim 2, characterized in that: The movable air inlet pipe (6) is installed at the lower end of the air inlet duct (22), and a mounting groove (61) is provided on the inner side of the upper end of the movable air inlet pipe (6), a dustproof plate (7) is inserted into the mounting groove (61), and positioning plug plates (62) are symmetrically fixedly provided on both sides of the upper end of the movable air inlet pipe (6), and when the movable air inlet pipe (6) is installed on the air inlet duct (22), the positioning plug plates (62) are inserted into the positioning grooves (23).

4. The projection device with a temperature maintenance system according to claim 3, characterized in that: The movable air inlet pipe (6) at the lower side of the positioning plug plate (62) is provided with a mounting socket (63), a mounting movable rod (631) is inserted into the mounting socket (63), a locking connecting plate (632) is fixedly provided at one end of the mounting movable rod (631), the locking connecting plate (632) is located at the outer side of the movable air inlet pipe (6), and a locking connecting block (633) is fixedly provided at the upper end of the locking connecting plate (632).

5. The projection device with a temperature maintenance system according to claim 4, characterized in that: A limit end block (634) is fixedly provided at the other end of the movable mounting rod (631), the limit end block (634) is located inside the movable air inlet pipe (6), and a first connecting spring (635) is sleeved on the movable mounting rod (631), an inner support plate (64) is fixedly provided inside the movable air inlet pipe (6), an inner support rod (65) is fixedly provided on the lower end surface of the inner support plate (64), a blocking plug block (66) is fixedly provided at the lower end of the inner support rod (65), and a supporting strip plate (67) is fixedly provided at the lower pipe opening of the movable air inlet pipe (6).

6. The projection device with a temperature maintenance system according to claim 5, characterized in that: A movable closing plate (8) is installed inside the movable air inlet pipe (6), and an air inlet hole (81) is opened on the movable closing plate (8). The air inlet hole (81) matches with the blocking plug (66), and the diameter of the air inlet hole (81) is equal to the diameter of the blocking plug (66). Matching contact frames (82) are symmetrically fixedly arranged on both sides of the movable closing plate (8), and a portion of the matching contact frame (82) is located outside the movable air inlet pipe (6).

7. The projection device with a temperature maintenance system according to claim 6, characterized in that: The matching sealing plate (9) is inserted into the movable matching cavity (14); when the heat dissipation fan (3) is in a non-working state, the matching sealing plate (9) closes the heat dissipation air outlet channel (13); an exhaust channel (91) is provided on the matching sealing plate (9); a connecting strip (92) is fixedly provided on one side of the exhaust channel (91); and a movable connecting rod (93) is hinged on the connecting strip (92).

8. The projection device with a temperature maintaining system according to claim 7, characterized in that: The lower end of the movable connecting rod (93) is hingedly connected with a blocking strip (94), and the blocking strip (94) is located at the lower end of the projection device body (1). When the heat dissipation fan (3) is in a non-operating state, the blocking strip (94) blocks the enhanced heat dissipation hole (11), and a protruding connecting frame (95) is fixedly provided on the blocking strip (94), and the protruding connecting frame (95) is hingedly connected to the lower end of the movable connecting rod (93). A limited matching hole (96) is provided on the blocking strip (94), and a matching bearing rod (12) is inserted into the limited matching hole (96).

9. The projection device with a temperature maintenance system according to claim 8, characterized in that: A connecting block (97) is fixedly provided at one end of the matching closing plate (9), a matching frame (98) is fixedly provided at the lower end of the connecting block (97), a driving connecting rod (99) is hingedly connected to the matching frame (98), and a contact movable plate (991) is hingedly connected to the lower end of the driving connecting rod (99).

10. The projection device with a temperature maintaining system according to claim 9, characterized in that: The contact movable plate (991) is sleeved on the guide matching upright rod (16), and a second connecting spring (992) is also sleeved on the guide matching upright rod (16), and the second connecting spring (992) is located on the upper side of the contact movable plate (991).

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