Control box and display screen

Abstract

The application relates to a control box and a display screen, the control box is applied to the display screen and comprises a box shell which is provided with a containing cavity, an adapter which is fixed on the box shell and is provided with a communication hole communicating with the containing cavity, the communication hole can be matched with a test nozzle to monitor the air tightness of the containing cavity, and an explosion-proof valve which is arranged at the communication hole of the adapter after the test nozzle is separated from the adapter, the explosion-proof valve is provided with a gas discharge hole communicating with the outside, and gas in the containing cavity can be discharged to the outside through the gas discharge hole. By arranging the adapter, the test nozzle adapter can be connected with the adapter to detect the air tightness of the containing cavity of the box shell before the explosion-proof valve is arranged, if the air tightness is good, the explosion-proof valve can be arranged, so that liquid drops and dust can be effectively prevented from invading into the containing cavity from other parts of the box shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen, in particular to a control box and a display screen comprising the control box. BACKGROUND

[0002] LED (Light Emitting Diode) display screen is used to display various information such as text, image and video. LED display screen integrates electronic technology, computer technology and information processing technology, adopts modular structure for display control, and changes screen display content such as text, animation, picture or video by lighting or extinguishing lamp beads. LED display screen has the advantages of bright color, wide dynamic range, high brightness, long service life and stable and reliable work, and is widely used in business media, cultural performance market, sports venues, information dissemination, news release and securities trading, and can meet the needs of different environments.

[0003] LED display screen usually comprises a control box for controlling current and signal of light emitting strips. An explosion-proof valve is usually arranged on the box body of the control box to prevent explosion caused by over-high pressure in the box body. However, for the traditional control box, there is a risk that external dust or liquid invades the control box. SUMMARY

[0004] One of the technical problems solved by the present application is how to effectively ensure the sealing performance of the control box.

[0005] A control box applied to a display screen, comprising:

[0006] a box shell, the box shell being provided with a containing cavity;

[0007] an adapter fixed on the box shell, the adapter being provided with a communication hole communicating with the containing cavity, the communication hole being capable of cooperating with a test nozzle to monitor the air tightness of the containing cavity; and

[0008] an explosion-proof valve installed at the communication hole of the adapter after the test nozzle is separated from the adapter, the explosion-proof valve being provided with a gas permeation hole communicating with the outside, and the gas in the containing cavity being capable of being discharged to the outside through the gas permeation hole.

[0009] In one of the embodiments, the adapter comprises a mounting portion, a pressing portion and a first sealing member, the mounting portion is connected with the pressing portion, the cross-sectional dimension of the pressing portion is greater than that of the mounting portion, the communication hole penetrates through the mounting portion and the pressing portion, the mounting portion is connected with the box shell, and the first sealing member is sleeved on the mounting portion and pressed between the box shell and the pressing portion.

[0010] In one of the embodiments, the mounting portion is threadedly connected with the box shell.

[0011] In one of the embodiments, the explosion-proof valve further has a gas guide hole in communication with the accommodating cavity, the gas guide hole extends along the axial direction of the explosion-proof valve and has a larger diameter than the gas permeable hole, and the gas permeable hole is in communication with the gas guide hole and is arranged at intervals along the circumferential direction of the explosion-proof valve.

[0012] In one of the embodiments, the explosion-proof valve further comprises a liquid blocking and gas permeable membrane, the liquid blocking and gas permeable membrane is located in the gas guide hole and blocks the gas guide hole, and the gas in the gas guide hole permeates through the liquid blocking and gas permeable membrane to be discharged from the gas permeable hole to the outside.

[0013] In one of the embodiments, the liquid blocking and gas permeable membrane comprises a polytetrafluoroethylene liquid blocking and gas permeable membrane, and the thickness of the liquid blocking and gas permeable membrane is 30-100 μm.

[0014] In one of the embodiments, the explosion-proof valve comprises a connecting portion, a convex ring portion and a second sealing member, the convex ring portion is arranged around the connecting portion and protrudes relative to the surface of the connecting portion, the gas guide hole and the gas permeable hole are arranged on the connecting portion, the connecting portion is detachably connected with the adapter, and the second sealing member is pressed between the convex ring portion and the adapter.

[0015] In one of the embodiments, the communication hole is internally threaded, and the internal thread is engaged with the external thread on the explosion-proof valve or the external thread on the test nozzle.

[0016] In one of the embodiments, a groove is formed on the outer surface of the box shell, and the explosion-proof valve is located in the groove.

[0017] A display screen comprises a light-emitting strip and the control box according to any one of the above embodiments, a plurality of the light-emitting strips are arranged at intervals on the box shell, and the light-emitting strip is slidingly connected with the box shell.

[0018] One technical effect of one embodiment of the present application is that, by arranging the adapter, before the explosion-proof valve is installed, the test nozzle adapter can be connected with the adapter to detect the air tightness of the accommodating cavity of the box shell, if the air tightness is good, the explosion-proof valve can be installed, thereby effectively preventing liquid drops and dust from invading the accommodating cavity from other parts of the box shell. If the air tightness of the accommodating cavity cannot meet the requirements, the box shell needs to be maintained until the air tightness of the accommodating cavity meets the requirements. Therefore, the arrangement of the adapter can effectively ensure the sealing performance of the control box. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A perspective structural schematic view of a display screen provided by one embodiment is shown.

[0020] Figure 2 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 1

[0021] Figure 3 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 1

[0022] Figure 4 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 1

[0023] Figure 5 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 4

[0024] Figure 6 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 4

[0025] Figure 7 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 1

[0026] Figure 8 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 7

[0027] Figure 9 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 7

[0028] Figure 10 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 7

[0029] Figure 11 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 7

[0030] Figure 12 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 1

[0031] Figure 13 As shown in the figure, the display screen is in the perspective view of the front surface; Figure 12 As shown in the figure, the display screen is in the perspective view of the front surface; DETAILED DESCRIPTION

[0032] ​​​​​​​​​​​For the purpose of clarity, the present application will be described with reference to the accompanying drawings in which the preferred embodiments of the present application will be disclosed. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0033] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "inner", "outer", "left", "right", and the like as used herein are intended to be relative terms and are not to be construed as limiting the present application

[0034] Referring to Figure 1 , Figure 2 and Figure 3 , one embodiment of the present application provides a display screen 10, which comprises a control box 20 and a light-emitting strip 30. The control box 20 comprises a box shell 101, an adapter 102, an explosion-proof valve 103 and control components. The light-emitting strip 30 is connected to the box shell 101. The number of the light-emitting strips 30 is multiple. The multiple light-emitting strips 30 are uniformly spaced apart, so that there is an equal gap 31 between each two adjacent light-emitting strips 30. By setting the above-mentioned gap 31, on the one hand, light can penetrate through the gap 31 between the front side and the back side of the display screen 10, thereby improving the light transmission performance of the display screen 10. For example, when the display screen 10 is installed on a glass curtain wall, the display screen 10 can not affect the lighting performance of the glass curtain wall. On the other hand, air flow can penetrate through the gap 31 between the front side and the back side of the display screen 10, thereby reducing the air resistance (e.g. wind resistance) borne by the display screen 10 and ensuring the stability and reliability of the installation of the display screen 10. On the other hand, the heat generated by the light-emitting strip 30 can be quickly discharged to the outside through the gap 31, thereby improving the heat dissipation performance of the display screen 10.

[0035] In some embodiments, the box shell 101 comprises a base 100, a cover 200, a first plug 310, a second plug 320 and a fixing member 330. The cross section of the base 100 is substantially C-shaped structure. The cross section size of the base 100 is equal everywhere. The material of the base 100 can be aluminum alloy and can be formed by extrusion. When the extruded aluminum profile is cut, bases 100 with different length sizes can be formed, thereby meeting the needs of the box shell 101 for different length sizes. Compared with the box shell 101 formed by die casting, the cutting speed of the extruded aluminum profile is faster and does not affect the shape of the box shell 101, thereby improving the processing efficiency of the box shell 101 on the basis of ensuring the quality.

[0036] Referring toFigure 2 、 Figure 5 and Figure 6 The first end cap 310 is connected to one end of the base 100, and the first end cap 310 can be mounted on the base 100 in a detachable manner such as bolt connection. The second end cap 320 is connected to the other end of the base 100, and the second end cap 320 can also be mounted on the base 100 in a detachable manner such as bolt connection. The base 100, the first end cap 310 and the second end cap 320 together enclose an open accommodating cavity 120, and the cross-sectional size of the accommodating cavity 120 is also equal everywhere due to the equal cross-sectional size of the base 100. The cover 200 is connected to the base 100 to cover the open accommodating cavity 120 to form a closed accommodating cavity 120, and the cover 200 can also be mounted on the base 100 in a detachable manner such as bolt connection. Of course, the first end cap 310, the second end cap 320 and the cover 200 are all in abutment with the base 100 with a sealing ring, thereby improving the sealing performance of the accommodating cavity 120 to gas and liquid, and preventing external liquid droplets and dust from entering the accommodating cavity 120.

[0037] The cover 200 is provided with a heat dissipation fin 210, which is located outside the accommodating cavity 120. The heat dissipation fin 210 can increase the surface area of the cover 200, thereby improving the heat dissipation performance of the cover 200. The control components are accommodated in the accommodating cavity 120, and the control components are used for current and signal control of the light-emitting bar 30. Since the accommodating cavity 120 has good sealing performance, it can effectively prevent external liquid droplets and dust from entering the accommodating cavity 120 to corrode the control components, thereby improving the service life of the entire control box 20. The control components can be directly fixed to the inner surface of the cover 200, so that the heat generated by the operation of the control components is directly transmitted to the outside through the cover 200, and therefore the cover 200 can be directly used as a heat sink for the control components.

[0038] The first end cap 310 has a first end face 311, and the first end cap 310 comprises a first boss 312 connected to the middle part of the first end face 311, and the first boss 312 protrudes a certain height relative to the first end face 311. The first boss 312 has an inclined surface 312a, which has the same orientation as the first end face 311, and the inclined surface 312a and the first end face 311 form an acute included angle α, and the value of the acute included angle α is in the range of 10° to 40°, for example, the specific value of the acute included angle α can be 10°, 20°, 30° or 40°, etc.

[0039] Meanwhile, refer to Figure 1 、 Figure 4 and Figure 6The second plug 320 has a second end surface 321, and the second plug 320 comprises two rows of second bosses 322, the second bosses 322 are connected with the edge of the second end surface 321, and the second bosses 322 protrude a certain height relative to the second end surface 321. The spacing space between the two rows of second bosses 322 forms the limiting space 302. For the same row of second bosses 322, the number of second bosses 322 can be one or more, and when the number of second bosses 322 is more, the plurality of second bosses 322 can be arranged in a straight line. In other embodiments, the second end surface 321 can be recessed to form a recess, and the recess can also form the limiting space 302 described above.

[0040] When a small display screen with a small display area is spliced to form a large display screen with a large display area, for the two small display screens spliced, one of the small display screens is recorded as a first display screen, and the other small display screen is recorded as a second display screen. When the first display screen and the second display screen are spliced, the first plug 310 on the first display screen is pressed against the second plug 320 on the second display screen, so that the first boss 312 on the first display screen cooperates with the limiting space 302 on the second display screen, that is, the inclined surface 312a of the first boss 312 on the first display screen is pressed against the second end surface 321 on the second display screen, of course, the first end surface 311 on the first display screen is also pressed against the second boss 322 on the second display screen.

[0041] If the first end surface 311 is not provided with the first boss 312, and the second end surface 321 is not provided with the second boss 322, in the case that the thickness of the first plug 310 and the second plug 320 is large, the distance between the two light emitting strips 30 closest to each other on the first display screen and the second display screen will be greater than the distance between the two light emitting strips 30 inside the same small display screen, thereby it is difficult to install with precision. If it is necessary to meet the installation precision, it is necessary to reduce the thickness of the first plug 310 or the second plug 320, which will affect the structural strength of each plug itself, and since the thickness of the first plug 310 or the second plug 320 is thin, it will also affect the installation of the bolts and other assembly conflicts in the splicing process, ultimately leading to the failure to stably and reliably realize the splicing of the first display screen and the second display screen. Obviously, for the two light emitting strips 30 closest to each other on the first display screen and the second display screen, the two light emitting strips 30 are respectively located at the edges of the first display screen and the second display screen for splicing.

[0042] The above embodiment can thin the corresponding parts of the first plug 310 and the second plug 320 by arranging the first boss 312 on the first end face 311 and the second boss 322 on the second end face 321, and when the first boss 312 cooperates with the limiting space 302 and the first end face 311 on the first display screen abuts against the second boss 322 on the second display screen, the distance between the two light-emitting strips 30 closest to each other on the first display screen and the second display screen is equal to the distance between the two light-emitting strips 30 inside the same small display screen, thereby ensuring the installation precision. Meanwhile, the first plug 310 and the second plug 320 are concave-convex structures with different thicknesses, which can ensure that they have reasonable structural strength. In addition, the part of the second plug 320 with the second boss 322 has a relatively thick thickness, which is convenient for the installation of bolts during splicing and avoids other assembly conflicts, and finally ensures that the splicing of the first display screen and the second display screen is stable and reliable. Furthermore, the cooperation of the first boss 312 and the limiting space 302 can form a good limiting effect on the first plug 310 and the second plug 320, prevent the display screen 10 from being displaced under the action of external force, and further improve the stability and reliability of the splicing of the display screen 10. Therefore, the above arrangement can simultaneously consider the installation precision and stability and reliability of the spliced display screen 10.

[0043] In addition, when the two display screens 10 are spliced, the first boss 312 is arranged with an inclined surface 312a at an acute angle with the first end face 311, which can ensure that the two display screens 10 form a certain angle after splicing, that is, the light-emitting surfaces of the two display screens 10 intersect at an angle, so that the large display screen 10 formed by splicing has a certain curvature, in other words, the light-emitting surface of the large display screen 10 is a curved surface rather than a flat surface. Therefore, by arranging the inclined surface 312a, the curvature of the light-emitting surface of the large display screen 10 can be reasonably adjusted, thereby meeting various splicing requirements.

[0044] Meanwhile refer to Figure 3 , Figure 12 and Figure 13In some embodiments, the fixing member 330 is mounted on the base 100, for example, the fixing member 330 can be fixed on the base 100 by screw connection. The fixing member 330 includes two sliding blocks 331, the two sliding blocks 331 are oppositely arranged, and the light bar 30 is clamped between the two sliding blocks 331. The sliding blocks 331 provide good support for the installation of the light bar 30. Of course, the sliding grooves 32 can be arranged on the two sides of the light bar 30, and the two sliding blocks 331 are in sliding fit with the sliding grooves 32, so that the entire box shell 101 slides relative to the light bar 30 along the length direction of the light bar 30, thereby changing the installation position of the box shell 101 on the light bar 30. When the display screen 10 is installed, the box shell 101 can be fixed on the support to realize the installation of the display screen 10. Since the box shell 101 can slide relative to the light bar 30 to change the installation position, the box shell 101 can avoid related obstacles to adapt to different installation conditions, thereby improving the adaptability of the display screen 10 to various installation conditions.

[0045] Meanwhile, refer to Figure 2 , Figure 3 and Figure 4 In some embodiments, the outer surface of the base 100 is recessed to form a groove 110, and the first plug 310 and the second plug 320 are both provided with a drain hole 301, which is in communication with the groove 110. By arranging the drain hole 301, the accumulated water in the groove 110 can be drained in real time, preventing the accumulated water in the groove 110 from entering the inside of the containing cavity 120 to corrode the control components, and avoiding the corrosion of the entire box shell 101 by the accumulated water.

[0046] Meanwhile, refer to Figure 3 , Figure 7 and Figure 8 In some embodiments, the adapter 102 is fixed on the box shell 101, and the adapter 102 is provided with a communication hole 440, which can communicate the containing cavity 120 with the outside. When a test nozzle is inserted into the communication hole 440 and cooperates with the communication hole 440, the test nozzle can be used to test the air tightness of the containing cavity 120, thereby testing the sealing performance of the containing cavity 120 to gas and liquid. The communication hole 440 is a threaded hole provided with an internal thread, and the test nozzle is provided with an external thread. When the test nozzle cooperates with the communication hole 440, the external thread of the test nozzle is engaged with the internal thread in the communication hole 440, so that the test nozzle is fixed on the adapter 102 by screw connection to test the air tightness.

[0047] Meanwhile, refer to Figure 8 , Figure 10 and Figure 11In particular, the adapter 102 comprises a mounting portion 410, a pressing portion 420, and a first sealing member 430. The mounting portion 410 is connected to one end of the pressing portion 420, for example, the mounting portion 410 and the pressing portion 420 can be coaxially arranged, and the cross-sectional dimension of the pressing portion 420 is larger than that of the mounting portion 410. The communication hole 440 can be a circular hole, which penetrates the mounting portion 410 and the pressing portion 420. The mounting portion 410 is connected to the box shell 101, for example, the mounting portion 410 is provided with external threads, the base 100 of the box shell 101 is provided with a fastening hole which is a threaded hole with internal threads. When the mounting portion 410 is arranged in the fastening hole and the external threads are engaged with the internal threads, the mounting portion 410 can be fixed on the box shell 101 by threaded connection, so that the adapter 102 can be detached from the box shell 101. Of course, the mounting portion 410 can also be fixed on the base 100 by snap connection.

[0048] The first sealing member 430 can be an O-shaped sealing ring, which is sleeved on the mounting portion 410. When the mounting portion 410 is arranged in the fastening hole, the first sealing member 430 is pressed between the base 100 and the pressing portion 420, so that the first sealing member 430 forms a good sealing effect on the fastening hole.

[0049] Meanwhile, referring to Figure 9 , Figure 10 and Figure 11 In some embodiments, the explosion-proof valve 103 can cooperate with the communication hole 440. The explosion-proof valve 103 is provided with a gas passage hole 521 which is directly communicated with the outside, and the gas in the accommodation cavity 120 can be discharged to the outside through the gas passage hole 521. The accommodation cavity 120 has good air tightness, so that the liquid and dust outside cannot enter the accommodation cavity 120 to erode the control components. However, when the heat generated by the operation of the control components makes the air pressure in the accommodation cavity 120 higher than the atmospheric pressure outside, although the gas in the accommodation cavity 120 cannot be discharged from other parts of the box shell 101, it can be discharged to the outside through the gas passage hole 521, thereby playing a certain pressure relief role on the accommodation cavity 120, preventing the entire box shell 101 from exploding.

[0050] The explosion-proof valve 103 comprises a liquid-isolating and air-permeable membrane 510, a connecting portion 520, a convex ring portion 530, and a second sealing member 540. The connecting portion 520 and the convex ring portion 530 are both in a coaxial columnar structure. The convex ring portion 530 is arranged around the middle portion of the connecting portion 520, and the convex ring portion 530 protrudes radially by a certain height relative to the side circumferential surface of the connecting portion 520. A gas guide hole 501 is formed in the connecting portion 520 and extends along the axial direction of the connecting portion 520. An air-permeable hole 521 is formed near the end portion of the connecting portion 520, and the air-permeable hole 521 is in communication with the gas guide hole 501. The air-permeable hole 521 can be multiple, and the multiple air-permeable holes 521 extend along the radial direction of the connecting portion 520 and are uniformly spaced along the circumferential direction of the connecting portion 520. For example, the number of air-permeable holes 521 can be four or six, and the number of air-permeable holes 521 can be appropriately increased or decreased according to actual needs. The diameter of the air-permeable hole 521 is smaller than the diameter of the gas guide hole 501.

[0051] The connecting portion 520 is provided with external threads, and when the connecting portion 520 is matched with the communication hole 440, the external threads on the connecting portion 520 are engaged with the internal threads in the communication hole 440, so that the entire explosion-proof valve 103 is fixed on the adapter 102 by threaded connection. Obviously, the explosion-proof valve 103 is detachably connected with the adapter 102. The second sealing member 540 can also be an O-shaped sealing ring, and the second sealing member 540 is sleeved on the connecting portion 520. When the connecting portion 520 is matched with the communication hole 440, the second sealing member 540 is pressed between the convex ring portion 530 and the pressing portion 420 of the adapter 102, so that the second sealing member 540 plays a good sealing role on the communication hole 440 of the adapter 102.

[0052] In some embodiments, the liquid-isolating and air-permeable membrane 510 comprises a polytetrafluoroethylene liquid-isolating and air-permeable membrane 510, i.e., the liquid-isolating and air-permeable membrane 510 is made of polytetrafluoroethylene material, so that the liquid cannot penetrate the liquid-isolating and air-permeable membrane 510, while other gases can penetrate the liquid-isolating and air-permeable membrane 510, i.e., the liquid-isolating and air-permeable membrane 510 can prevent the liquid from passing through and allow the operating gas to pass through. The thickness of the liquid-isolating and air-permeable membrane 510 can be in the range of 30 μm to 100 μm, for example, the thickness of the liquid-isolating and air-permeable membrane 510 can be 30 μm, 40 μm, 70 μm, or 100 μm, etc.

[0053] The liquid-isolating and air-permeable membrane 510 is located in the gas guide hole 501 and is connected with the inner wall of the gas guide hole 501, thereby forming a plugging effect on the gas guide hole 501. For the gas entering the gas guide hole 501 from the accommodation hole, the gas must pass through the liquid-isolating and air-permeable membrane 510 and be discharged to the outside through the air-permeable hole 521. Similarly, for the gas entering the air-permeable hole 521 from the outside, the gas must pass through the liquid-isolating and air-permeable membrane 510 and enter the accommodation cavity 120 through the gas guide hole 501.

[0054] By setting the liquid-proof air-permeable membrane 510, the liquid drops and dust from the outside that enter the air-permeable holes 521 cannot continue to permeate the liquid-proof air-permeable membrane 510 and enter the accommodating cavity 120 through the air guide holes 501, effectively avoiding the erosion of the control components by the liquid drops and dust from the outside. However, when the heat generated by the operation of the control components makes the air pressure in the accommodating cavity 120 higher than the atmospheric pressure, the gas in the accommodating cavity 120 can permeate the liquid-proof air-permeable membrane 510 and be discharged to the outside through the air-permeable holes 521, thus effectively relieving the pressure in the accommodating cavity 120 and preventing the explosion of the entire box shell 101, improving the safety of the entire control box 20. Therefore, the explosion-proof valve 103 can not only ensure the safety of the control box 20 by playing a role of explosion-proof, but also prevent the erosion of the control components in the accommodating cavity 120 by the liquid drops and dust from the outside, i.e., the explosion-proof valve 103 can effectively protect the control components, thus improving the service life of the control box 20.

[0055] Before the explosion-proof valve 103 is installed, the test nozzle is first matched with the communication hole 440 on the adapter 102 to test the air tightness of the entire accommodating cavity 120. For example, the gas is input into the accommodating cavity 120 through the test nozzle to make the air pressure in the accommodating cavity 120 higher than the atmospheric pressure. After a period of time, when the pressure value of the air pressure gauge connected with the test nozzle remains unchanged, it indicates that the box shell 101 does not have the phenomenon of air leakage and the entire accommodating cavity 120 has good air tightness. At this time, the test nozzle is unloaded from the adapter 102, and then the explosion-proof valve 103 is installed on the adapter 102. If the pressure value of the air pressure gauge decreases after a period of time, it indicates that the box shell 101 has the phenomenon of air leakage and the air tightness of the accommodating cavity 120 is poor, and the entire box shell 101 must be maintained.

[0056] Without the adapter 102, the user cannot detect the air tightness of the accommodating cavity 120 through the test nozzle before the explosion-proof valve 103 is installed on the box shell 101. If the air tightness of the accommodating cavity 120 does not meet the relevant requirements, when the explosion-proof valve 103 is installed on the box shell 101, the liquid drops and dust can enter the accommodating cavity 120 from the parts of the box shell 101 with poor sealing, i.e., the liquid drops and dust can bypass the explosion-proof valve 103 and enter the accommodating cavity 120. The above embodiment sets the adapter 102, which can detect the air tightness of the accommodating cavity 120 before the explosion-proof valve 103 is installed. If the air tightness is good, the explosion-proof valve 103 can be installed, thus effectively preventing the liquid drops and dust from entering the accommodating cavity 120 from other parts of the box shell 101. If the air tightness of the accommodating cavity 120 cannot meet the requirements, the box shell 101 must be maintained until the accommodating cavity 120 has good air tightness.

[0057] Referring to Figure 7Since the groove 110 is formed on the base 100, the adapter 102 can be arranged in the groove 110, and when the explosion-proof valve 103 is connected with the adapter 102, the explosion-proof valve 103 will also be located in the groove 110. By arranging the adapter 102 and the explosion-proof valve 103 in the groove 110, the groove 110 can accommodate the explosion-proof valve 103, and the base 100 can protect the explosion-proof valve 103, so that the explosion-proof valve 103 is difficult to contact with liquid drops and dust outside, thereby reducing the corrosion of the liquid drops and the dust on the explosion-proof valve 103. At the same time, the external impact force is also difficult to directly act on the explosion-proof valve 103, avoiding the impact force from damaging the explosion-proof valve 103 or affecting the stable reliability of the installation of the explosion-proof valve 103.

[0058] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as within the scope of the present disclosure.

[0059] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A control box for use in a display screen, characterized in that, include: The enclosure includes a base, a cover, a first plug, and a second plug. The base has a C-shaped cross-section and is formed by cutting extruded aluminum profiles. The base, the first plug, and the second plug together form an open cavity. The cover is connected to the base to close the cavity. The outer surface of the cover is provided with heat dissipation fins. The first plug has a first end face and a first protrusion connected to the middle of the first end face. The first protrusion has an inclined surface that forms an acute angle of 10°-40° with the first end face. The second plug has a second end face and two rows of second protrusions connected to the edge of the second end face. A limiting space is formed between the two rows of second protrusions. An adapter is fixed to the housing. The adapter has a connecting hole that communicates with the accommodating cavity. The connecting hole can cooperate with a test nozzle to monitor the airtightness of the accommodating cavity. The adapter includes a mounting part, a pressing part, and a first sealing member. The mounting part is connected to the pressing part. The cross-sectional dimension of the pressing part is larger than that of the mounting part. The connecting hole passes through the mounting part and the pressing part. The mounting part is connected to the housing. The first sealing member is sleeved on the mounting part and presses against the housing and the pressing part. and An explosion-proof valve is installed at the communication hole of the adapter after the test nozzle is separated from the adapter. The explosion-proof valve has a vent hole that communicates with the outside, and the gas in the accommodating cavity can be discharged to the outside through the vent hole. The explosion-proof valve includes a connecting part, a convex ring part, and a second sealing member. The convex ring part is arranged around the connecting part and protrudes relative to the surface of the connecting part. The vent hole is provided on the connecting part. The connecting part is detachably connected to the adapter. The second sealing member is pressed between the convex ring part and the adapter.

2. The control box according to claim 1, characterized in that, The mounting part is threadedly connected to the housing.

3. The control box according to claim 1, characterized in that, The explosion-proof valve also has a vent hole that communicates with the accommodating cavity. The vent hole extends along the axial direction of the explosion-proof valve and has a diameter larger than that of the vent hole. The vent hole communicates with the vent hole and is spaced apart along the circumference of the explosion-proof valve.

4. The control box according to claim 3, characterized in that, The explosion-proof valve also includes a liquid-blocking and gas-permeable membrane that prevents liquid from passing through and allows gas to pass through. The liquid-blocking and gas-permeable membrane is located inside the gas guide hole and blocks the gas guide hole. Gas in the gas guide hole passes through the liquid-blocking and gas-permeable membrane to be discharged to the outside through the gas guide hole.

5. The control box according to claim 4, characterized in that, The liquid-sealing and breathable membrane includes a polytetrafluoroethylene liquid-sealing and breathable membrane, and the thickness of the liquid-sealing and breathable membrane is from 30 μm to 100 μm.

6. The control box according to claim 5, characterized in that, The air guide hole is located on the connecting part.

7. The control box according to claim 1, characterized in that, The connecting hole is provided with an internal thread, which engages with the external thread on the explosion-proof valve, or the internal thread engages with the external thread on the test nozzle.

8. The control box according to claim 1, characterized in that, The number of vent holes is multiple, and the multiple vent holes extend radially along the connecting portion, and the multiple vent holes can be evenly spaced along the circumference of the connecting portion.

9. The control box according to claim 1, characterized in that, A groove is formed on the outer surface of the enclosure, and the explosion-proof valve is located in the groove.

10. A display screen, characterized in that, The device includes light-emitting strips and a control box as described in any one of claims 1 to 9, wherein a plurality of light-emitting strips are spaced apart on the box shell and the light-emitting strips are slidably connected to the box shell.

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