LED module board and display screen

Abstract

The present invention relates to the technical field of LED module boards, and the present invention discloses an LED module board and a display screen, including: a shell, an active cavity is provided around the shell, a slide groove connected to the active cavity is provided around the inner cavity of the shell, a plurality of slots are provided at equal distances on the front and rear sides of the inner cavity of the slide groove, and a plurality of air inlets connected to the inner cavity of the active cavity located below are provided at the bottom of the inner cavity of the shell; a protective mechanism is provided at the front side of the inner cavity of the shell; a protective screen is detachably provided at the front side of the inner cavity of the shell; an LED module board is provided in the inner cavity of the shell, and the LED module board is located at the rear side of the protective mechanism; and there are a plurality of lamp beads, and the plurality of lamp beads are provided at the front side of the LED module board. The device has the advantages of good heat dissipation effect and strong anti-static performance, and provides a more reliable and efficient solution for the application of LED module boards and display screens.

Description

Technical Field

[0001] The invention relates to the technical field of LED module boards, in particular to an LED module board and a display screen. Background Art

[0002] LED module boards and display screens are important components of modern display technology and are widely used in advertising, information display, stage backgrounds, and traffic signs. LED module boards are composed of multiple small light-emitting diode lamp beads, which are arranged on a printed circuit board through precise circuit design to form a complete display unit. LED display screens are composed of multiple such module boards, which can display text, images and other information, and have the advantages of bright colors, high brightness, long life and low energy consumption.

[0003] However, the existing LED module board and display technology have some significant disadvantages. First, poor heat dissipation is a common problem. Since LED lamp beads generate heat when working, the dense arrangement of the module board makes it difficult to effectively dissipate the heat, resulting in an increase in the temperature of the LED module board, which not only affects the performance and life of the LED lamp beads, but may also cause safety issues.

[0004] In addition, LED module boards are prone to static electricity during use, which may not only damage the circuit board, but also cause discomfort to the human body;

[0005] Secondly, the lamp beads of the LED module board are often damaged. When a lamp bead is damaged, it needs to be replaced. However, during the replacement process, since the lamp beads are densely arranged and the gaps are small, when using a hot air gun to blow hot air at the lamp bead that needs to be replaced, it may also blow the nearby intact lamp beads, causing these normal lamp beads to lose color and be damaged; even when replacing the lamp beads, other normal lamp beads may be accidentally touched, causing the normal lamp beads to fall off. This physical damage will directly affect the overall display effect of the display screen, and may even cause the entire module board to fail, causing inconvenience and economic losses to users. Summary of the invention

[0006] The purpose of the present invention is to provide an LED module board and a display screen to at least solve the problems of poor heat dissipation, electrostatic hazards, and easy damage to normal lamp beads during replacement of lamp beads in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an LED module board and a display screen, comprising: a shell, an active cavity is provided around the shell, a slide groove connected to the active cavity is provided around the inner cavity of the shell, a plurality of slots are provided at equal distances on both the front and rear sides of the inner cavity of the slide groove, and a plurality of air inlets connected to the inner cavity of the active cavity located below are provided at the bottom of the inner cavity of the shell; a protective mechanism is provided at the front side of the inner cavity of the shell; a protective screen is detachably provided at the front side of the inner cavity of the shell; an LED module board is provided in the inner cavity of the shell, and the LED module board is located at the rear side of the protective mechanism; the number of lamp beads is several, and the several lamp beads are all provided at the front side of the LED module board;

[0008] The protection mechanism includes: a first guide rod, the number of the first guide rods is two, and the left and right ends of the two first guide rods are respectively arranged at the left and right front ends of the inner cavity of the two active cavities located on the upper and lower sides; the number of the second guide rods is two, and the upper and lower ends of the two second guide rods are respectively arranged at the upper and lower front ends of the inner cavity of the two active cavities located on the left and right sides; the number of the first heat insulation boards is two, and the upper and lower sides of the outer walls of the two first heat insulation boards can be slidably adapted and inserted into the left and right sides of the inner cavity of the two slide grooves located on the upper and lower sides, and the upper and lower ends of the first heat insulation boards can be slidably sleeved on the outer walls of the two first guide rods; the number of the second heat insulation boards is two, and the left and right sides of the outer walls of the two second heat insulation boards can be slidably adapted and inserted into the upper and lower sides of the inner cavity of the two slide grooves located on the left and right sides, and the left and right ends of the second heat insulation board can be slidably sleeved on the outer walls of the two second guide rods.

[0009] Preferably, in order to position the first heat insulation board and the second heat insulation board, extrusion grooves are provided on both the upper and lower ends of the front and rear sides of the first heat insulation board, and extrusion grooves are provided on both the left and right ends of the front and rear sides of the second heat insulation board. The positions of the extrusion grooves correspond to the positions of the card slots. A spring is embedded in the inner cavity of the extrusion groove, one end of the spring is clamped to the inner side of the inner cavity of the extrusion groove, and a card ball is slidably embedded in the inner cavity of the extrusion groove. The card ball extends into the inner cavity of the card slot corresponding to its position, and the other end of the spring is clamped to the outer wall of the card ball.

[0010] Preferably, the length of the card ball extending into the inner cavity of the card slot is smaller than its radius.

[0011] Preferably, in order to prevent static electricity from damaging the LED module board and to absorb dust, the inner cavity of the shell is also provided with: an insulating frame, which is detachably arranged in the inner cavity of the shell, and the insulating frame is located behind the LED module board; there are several conductive brushes, and the several conductive brushes are all arranged on the front side of the insulating frame, and the conductive brushes are in contact with the LED module board; the conductive filter is detachably arranged on the rear side of the inner cavity of the active cavity located below; one end of the wire is electrically connected to the conductive brush, and the other end of the wire is electrically connected to the conductive filter.

[0012] Preferably, the conductive filter is electrically connected to a clamping diode, and the clamping diode is connected to a ground wire.

[0013] Preferably, insulating rubber is provided on the rear side of the conductive filter.

[0014] Preferably, in order to dissipate heat for the LED module board, the insulating frame is also provided with: a temperature sensor, the number of which is several and all of which are arranged on the front side of the insulating frame; and an intelligent fan, which is arranged on the rear side of the inner cavity of the shell, and the intelligent fan and the temperature sensor are electrically connected.

[0015] The LED module board and display screen proposed by the present invention have the following beneficial effects:

[0016] 1. The present invention controls lamp beads through the LED module board, thereby realizing color display, utilizes a protective screen to protect the LED module board and the lamp beads, utilizes an intelligent fan to dissipate heat to the LED module board, utilizes a temperature sensor to detect the temperature of the LED module board, thereby can adjust the speed of the intelligent fan according to the temperature of the LED module board detected by the temperature sensor, thereby realizing energy saving.

[0017] 2. In the present invention, when the LED module board generates static electricity, the static electricity can be transferred to the conductive filter through the conductive brush and the conductor to prevent the static electricity from causing damage to the LED module board. At the same time, the static electricity accumulates on the conductive filter, and the dust can be adsorbed by the ability of static electricity adsorption. Under normal conditions, the clamping diode is in a high-resistance state and does not affect the normal operation of the circuit. The conductive filter can still accumulate static electricity and adsorb dust. When an overvoltage appears in the circuit, the clamping diode is triggered and becomes a low-resistance state, and quickly guides the overvoltage energy to the ground wire to prevent the generation of reverse current and damage to the LED module board.

[0018] 3. When replacing lamp beads in the present invention, the first heat insulation board can be slid left and right, the second heat insulation board can be slid up and down, and the first heat insulation board and the second heat insulation board can be positioned by utilizing the cooperation between the spring, the card ball and the card slot. The first heat insulation board and the second heat insulation board can be utilized to shield the intact lamp beads near the lamp beads that need to be replaced, to prevent the hot air gun from blowing the intact lamp beads, thereby causing the intact lamp group to lose color and be damaged, and to prevent other normal lamp beads from being accidentally touched when replacing the lamp beads, thereby causing the normal lamp beads to fall off.

[0019] 4. The device can significantly improve the heat dissipation performance of the LED module board, and can adjust the speed of the intelligent fan in real time according to the temperature of the LED module board. It can not only effectively reduce the working temperature, but also save energy, thereby improving the performance stability of the lamp beads and extending their service life. In addition, the device can reduce the damage of static electricity to the LED module board, and can electrostatically adsorb dust on the air flowing into the inner cavity of the shell, to prevent the LED module board from accumulating dust and affecting the heat dissipation effect of the LED module board, and even causing damage to the LED module board. In addition, when replacing the lamp beads, the device can also block the nearby intact lamp beads, avoiding the risk of physical damage or discoloration damage to the normal lamp beads nearby during the replacement process, ensuring the overall display effect, and reducing the inconvenience and economic losses of users. In summary, the device has the advantages of good heat dissipation effect and strong anti-static performance, and provides a more reliable and efficient solution for the application of LED module boards and display screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural diagram of the smart fan;

[0022] Figure 3 It is a structural schematic diagram of an insulating frame;

[0023] Figure 4 An exploded view of the present invention;

[0024] Figure 5 Schematic diagram of the protection mechanism

[0025] Figure 6 for Figure 3 A magnified image

[0026] Figure 7 for Figure 4 Enlarged view of point B

[0027] Figure 8 for Figure 5 Enlarged view of point C

[0028] Fig. 9 for Figure 5 Enlarged view of point D.

[0029] In the figure: 1. Shell; 2. Active cavity; 3. Slide groove; 4. Card slot; 5. Air inlet; 6. Protection mechanism; 61. First guide rod; 62. Second guide rod; 63. First heat insulation board; 64. Second heat insulation board; 65. Extrusion groove; 66. Spring; 67. Card ball; 7. Protection screen; 8. LED module board; 9. Lamp beads; 10. Insulation frame; 11. Conductive brush; 12. Temperature sensor; 13. Smart fan; 14. Conductive filter; 15. Wire. 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 Figure 1-9The present invention provides a technical solution of an LED module board and a display screen, comprising: a shell 1, an active cavity 2, a slide groove 3, a card slot 4, an air inlet 5, a protection mechanism 6, a protective screen 7, an LED module board 8, a lamp bead 9, an insulating frame 10, a conductive brush 11, a temperature sensor 12, an intelligent fan 13, a conductive filter 14 and a wire 15. The shell 1 is provided with an active cavity 2 around it, and the inner cavity of the shell 1 is provided with slide grooves 3 connected to the inner cavity of the active cavity 2 around it, and a plurality of card slots 4 are equidistantly provided on both sides of the inner cavity of the slide groove 3, and a plurality of air inlets 5 connected to the inner cavity of the active cavity 2 located below are provided at the bottom end of the inner cavity of the shell 1, and the protection mechanism 6 is arranged on the front side of the inner cavity of the shell 1, and the intact lamp bead 9 can be protected by the protection mechanism 6, and the protective screen 7 is detachably arranged at the front side of the inner cavity of the housing 1, the protective screen 7 is used to protect the lamp beads 9 and the LED module board 8, the LED module board 8 is arranged in the inner cavity of the housing 1, the LED module board 8 is located at the rear side of the protective mechanism 6, the LED module board 8 is a prior art, and no further details are given here, the number of lamp beads 9 is several, and the several lamp beads 9 are all arranged at the front side of the LED module board 8, the lamp beads 9 are a prior art, and no further details are given here, the insulating frame 10 is detachably arranged in the inner cavity of the housing 1, the insulating frame 10 is located at the rear of the LED module board 8, the insulating frame 10 is used to support the conductive brush 11 and the temperature sensor 12, the number of the conductive brush 11 is several, and the several conductive brushes 11 are all arranged at the front side of the insulating frame 10, and the conductive brush 11 contacts the LED module board 8 The conductive brush 11 is a prior art and will not be described in detail here. The conductive brush 11 is used to transmit static electricity. The conductive filter 14 is detachably arranged on the rear side of the inner cavity of the active cavity 2 located below. The conductive filter 14 can be used to block dust and absorb electrostatic dust. The conductive filter 14 is electrically connected to a clamping diode, and the clamping diode is connected to a ground wire. The clamping diode is a prior art. When there is an excessive current in the circuit, the clamping diode provides a low impedance path to absorb the overcurrent to protect other circuits or equipment from being affected by the excessive current. I will not describe it in detail here. Under normal conditions, the clamping diode is in a high resistance state and does not affect the normal operation of the circuit. The conductive filter 14 can still accumulate static electricity and absorb dust. When an overvoltage occurs in the circuit, the clamping diode The diode is triggered and becomes a low-resistance state, and quickly guides the overvoltage energy to the ground wire to prevent the generation of reverse current and damage to the LED module board 8. An insulating rubber is arranged on the rear side of the conductive filter 14 to prevent people from accidentally touching the conductive filter 14 and causing discomfort to the people. One end of the wire 15 is electrically connected to the conductive brush 11, and the other end of the wire 15 is electrically connected to the conductive filter 14. The wire 15 is used to transmit static electricity. There are several temperature sensors 12, and several temperature sensors 12 are arranged on the front side of the insulating frame 10. The temperature sensor 12 is a prior art and will not be described in detail here. The temperature sensor 12 is used for temperature monitoring here. The intelligent fan 13 is arranged on the rear side of the inner cavity of the shell 1, and the intelligent fan 13 and the temperature sensor 12 are electrically connected.The smart fan 13 is a prior art and will not be described in detail here. The smart fan 13 is used to dissipate heat from the LED module board 8.

[0032] As a preferred solution, further, the protection mechanism 6 includes: a first guide rod 61, a second guide rod 62, a first heat insulation plate 63, a second heat insulation plate 64, an extrusion groove 65, a spring 66 and a card ball 67. The number of the first guide rod 61 is two, and the left and right ends of the two first guide rods 61 are respectively arranged at the front ends of the left and right sides of the inner cavity of the two active cavities 2 located on the upper and lower sides. The first guide rod 61 is used to limit the first heat insulation plate 63. The number of the second guide rod 62 is two, and the upper and lower ends of the two second guide rods 62 are respectively arranged at the inner cavities of the two active cavities 2 located on the left and right sides. At the front ends of the upper and lower sides, the second guide rods 62 are used to limit the second heat insulation board 64. The number of the first heat insulation boards 63 is two. The upper and lower sides of the outer walls of the two first heat insulation boards 63 can be slidably adapted and inserted into the left and right sides of the inner cavity of the two slide grooves 3 located on the upper and lower sides. The upper and lower ends of the first heat insulation board 63 can be slidably sleeved on the outer walls of the two first guide rods 61. The number of the second heat insulation boards 64 is two. The left and right sides of the outer walls of the two second heat insulation boards 64 can be slidably adapted and inserted into the upper and lower sides of the inner cavity of the two slide grooves 3 located on the left and right sides. The second heat insulation board The left and right ends of 64 are respectively slidably sleeved on the outer walls of the two second guide rods 62, and the first heat insulation board 63 and the second heat insulation board 64 can be used to shield the intact lamp beads 9. The first heat insulation board 63 is provided with extrusion grooves 65 at both ends of the front and rear sides and the upper and lower ends, and the second heat insulation board 64 is provided with extrusion grooves 65 at both ends of the front and rear sides and the left and right ends. The position of the extrusion groove 65 corresponds to the position of the card slot 4. The spring 66 is embedded in the inner cavity of the extrusion groove 65, and one end of the spring 66 is clamped on the inner side of the inner cavity of the extrusion groove 65. The spring 66 is a rotating spring and is squeezed or stretched by external force. After that, it undergoes elastic deformation and returns to its initial state after the external force is removed. The spring 66 is used here to squeeze the card ball 67 into the inner cavity of the card slot 4. The card ball 67 can be slidably embedded in the inner cavity of the extrusion groove 65. The card ball 67 extends into the inner cavity of the card slot 4 corresponding to its position. The other end of the spring 66 is clamped on the outer wall of the card ball 67. The cooperation between the card ball 67 and the card slot 4 can be used to position the first heat insulation board 63 and the second heat insulation board 64. The length of the card ball 67 extending into the inner cavity of the card slot 4 is less than its radius, thereby ensuring that the first heat insulation board 63 and the second heat insulation board 64 can slide.

[0033] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0034] Step 1: When in use, the LED module board 8 is used to control the lamp beads 9 to display colors, and the intelligent fan 13 is started. The air flows into the inner cavity of the shell 1 through the conductive filter 14, the active cavity 2 located below, and the air inlet 5, and the air in the inner cavity of the shell 1 is extracted by the intelligent fan 13, so as to achieve heat exchange, and then the intelligent fan 13 can be used to dissipate heat for the LED module board 8. At the same time, the temperature sensor 12 is used to monitor the temperature of the LED module board 8 in real time, and the value monitored by the temperature sensor 12 is transmitted to the intelligent fan 13. The number of revolutions of the intelligent fan 13 is controlled according to the temperature monitored by the temperature sensor 12, so as to achieve effective heat dissipation of the LED module board 8 and save energy;

[0035] Step 2: When the LED module board 8 generates static electricity during operation, the static electricity generated by the LED module board 8 can be transferred to the conductive filter 14 through the conductive brush 11 and the wire 15. The static electricity accumulates on the conductive filter 14, so that the conductive filter 14 can be used to block dust in the air and absorb dust in the air by static electricity. Under normal conditions, the clamping diode is in a high-resistance state and does not affect the normal operation of the circuit. The conductive filter 14 can still accumulate static electricity and absorb dust. When an overvoltage occurs in the circuit, the clamping diode is triggered and becomes a low-resistance state, and quickly guides the overvoltage energy to the ground wire to prevent the generation of reverse current and damage to the LED module board 8, so that the static electricity on the LED module board 8 can be eliminated while reducing the dust flowing into the inner cavity of the housing 1.

[0036] Step 3, when the lamp bead is damaged and needs to be replaced, the protective screen is removed, and the first heat insulation board 63 and the second heat insulation board 64 are slid left and right. While the first heat insulation board 63 and the second heat insulation board 64 are sliding, the card slot 4 can be used to squeeze the card ball 67 to move into the inner cavity of the extrusion slot 65, and the spring 66 is squeezed to elastically deform until the card ball 67 is completely moved into the inner cavity of the extrusion slot 65, and the first heat insulation board 63 and the second heat insulation board 64 can be slid until the first heat insulation board 63 and the second heat insulation board 64 slide to a suitable position to block the lamp bead 9 near the lamp bead 9 that needs to be replaced. At this time, under the elastic force of the spring 66, the card ball 67 can be pushed to move into the inner cavity of the card slot 4, so that the first heat insulation board 63 and the second heat insulation board 64 can be positioned, and then the damaged lamp bead 9 can be replaced, which can prevent the normal lamp bead 9 from being damaged or discolored when the lamp bead 9 is replaced;

[0037] The present device can significantly improve the heat dissipation performance of the LED module board 8, and can adjust the rotation speed of the intelligent fan 13 in real time according to the temperature of the LED module board 8, which can not only effectively reduce the working temperature, but also save energy, thereby improving the performance stability of the lamp bead 9 and extending its service life. In addition, the present device can reduce the damage of static electricity to the LED module board 8, and can perform electrostatic dust adsorption on the air flowing into the inner cavity of the shell 1, to prevent the LED module board 8 from accumulating dust and affecting the heat dissipation effect of the LED module board 8, or even causing damage to the LED module board 8. In addition, when replacing the lamp bead 9, the present device can also block the nearby intact lamp bead 9, avoiding the risk of physical damage or discoloration damage to the nearby normal lamp bead 9 during the replacement process, ensuring the overall display effect, and reducing the inconvenience and economic loss of the user. In summary, the present device has the advantages of good heat dissipation effect and strong anti-static performance, and provides a more reliable and efficient solution for the application of LED module boards and display screens.

[0038] 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. An LED module board and a display screen, It is characterized in that include: A shell (1), wherein an active cavity (2) is provided around the shell (1), a slide groove (3) communicating with the inner cavity of the active cavity (2) is provided around the inner cavity of the shell (1), a plurality of slots (4) are provided at equal distances on both sides of the inner cavity of the slide groove (3), and a plurality of air inlets (5) communicating with the inner cavity of the active cavity (2) located below are provided at the bottom of the inner cavity of the shell (1); A protection mechanism (6), wherein the protection mechanism (6) is arranged on the front side of the inner cavity of the shell (1); A protective screen (7), the protective screen (7) being detachably arranged on the front side of the inner cavity of the shell (1); An LED module board (8), the LED module board (8) being arranged in the inner cavity of the housing (1), and the LED module board (8) being located at the rear side of the protection mechanism (6); Lamp beads (9), the number of the lamp beads (9) is a plurality, and the plurality of lamp beads (9) are all arranged on the front side of the LED module board (8); The protection mechanism (6) comprises: A first guide rod (61), the number of the first guide rods (61) being two, and the left and right ends of the two first guide rods (61) being respectively arranged at the front ends of the left and right sides of the inner cavities of the two movable cavities (2) located at the upper and lower sides; A second guide rod (62), the number of the second guide rods (62) being two, and the upper and lower ends of the two second guide rods (62) being respectively arranged at the upper and lower front ends of the inner cavities of the two movable cavities (2) located on the left and right sides; A first heat insulation plate (63), the number of the first heat insulation plates (63) being two, the upper and lower sides of the outer walls of the two first heat insulation plates (63) being respectively slidably adapted to be plugged into the left and right sides of the inner cavity of the two slide grooves (3) located at the upper and lower sides, and the upper and lower ends of the first heat insulation plates (63) being respectively slidably sleeved on the outer walls of the two first guide rods (61); A second heat insulation plate (64), the number of the second heat insulation plates (64) being two, the left and right sides of the outer walls of the two second heat insulation plates (64) being respectively slidably adapted to be plugged into the upper and lower sides of the inner cavity of the two slide grooves (3) located on the left and right sides, and the left and right ends of the second heat insulation plates (64) being respectively slidably sleeved on the outer walls of the two second guide rods (62); Extrusion grooves (65) are provided at both the front and rear sides and the upper and lower ends of the first heat insulation board (63); extrusion grooves (65) are provided at both the front and rear sides and the left and right ends of the second heat insulation board (64); the position of the extrusion groove (65) corresponds to the position of the clamping groove (4); a spring (66) is embedded in the inner cavity of the extrusion groove (65); one end of the spring (66) is clamped to the inner side of the inner cavity of the extrusion groove (65); a clamping ball (67) is slidably embedded in the inner cavity of the extrusion groove (65); the clamping ball (67) extends into the inner cavity of the clamping groove (4) corresponding to its position; the other end of the spring (66) is clamped to the outer wall of the clamping ball (67).

2. An LED module board and display screen according to claim 1, Features: The length of the clamping ball (67) extending into the inner cavity of the clamping slot (4) is less than its radius.

3. The LED module board and display screen according to claim 2, Features: The inner cavity of the housing (1) is also provided with: An insulating frame (10), the insulating frame (10) being detachably arranged in the inner cavity of the housing (1), and the insulating frame (10) being located behind the LED module board (8); Conductive brushes (11), the number of the conductive brushes (11) being several, the several conductive brushes (11) being arranged on the front side of the insulating frame (10), and the conductive brushes (11) being in contact with the LED module board (8); A conductive filter screen (14), the conductive filter screen (14) being detachably arranged at the rear side of the inner cavity of the movable cavity (2) located below; A conductive wire (15), one end of the conductive wire (15) being electrically connected to the conductive brush (11), and the other end of the conductive wire (15) being electrically connected to the conductive filter screen (14).

4. The LED module board and display screen according to claim 3, Features: The conductive filter (14) is electrically connected to a clamping diode, and the clamping diode is connected to a ground wire.

5. The LED module board and display screen according to claim 4, Features: Insulating rubber is provided on the rear side of the conductive filter screen (14).

6. The LED module board and display screen according to claim 5, Features: The insulating frame (10) is also provided with: A temperature sensor (12), wherein the number of the temperature sensors (12) is a plurality, and the plurality of temperature sensors (12) are all arranged on the front side of the insulating frame (10); An intelligent fan (13), wherein the intelligent fan (13) is arranged at the rear side of the inner cavity of the housing (1), and the intelligent fan (13) and the temperature sensor (12) are electrically connected.

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