CN111741635A - Control box and display - Google Patents

Abstract

The invention relates to a control box and a display screen, the control box is applied to the display screen and comprises: the case shell, the holding chamber has been seted up to the case shell. The adapter is fixed on the box shell and provided with a communication hole communicated with the accommodating cavity, and the communication hole can be matched with the test nozzle to monitor the air tightness of the accommodating cavity. And the explosion-proof valve is used for being installed at the communication hole of the adapter after the test nozzle is separated from the adapter, the explosion-proof valve is provided with a vent hole communicated with the outside, and gas in the accommodating cavity can be discharged to the outside through the vent hole. Through setting up the adaptor, before the installation explosion-proof valve, can adopt test mouth adaptor and adaptor to be connected in order to detect the gas tightness in case shell holding chamber, if the gas tightness is good, then the explosion-proof valve of mountable to prevent effectively that liquid drop and dust from invading in the holding chamber from other positions of case shell.

Description

Control box and display

technical field

The invention relates to the technical field of display screens, in particular to a control box and a display screen including the control box.

Background technique

LED (Light Emitting Diode, Light Emitting Diode) displays are used to display various information such as text, images and videos. The LED display screen integrates electronic technology, computer technology and information processing technology, adopts a modular structure for display control, and changes the screen display content such as text, animation, pictures or videos by lighting or extinguishing the lamp beads. LED display has the advantages of bright color, wide dynamic range, high brightness, long life and stable and reliable operation, so it is widely used in commercial media, cultural performance market, stadiums, information dissemination, news release and securities trading, etc. the needs of the environment.

The LED display usually includes a control box that controls the current and signal of the light-emitting strip. An explosion-proof valve is usually set on the box of the control box to prevent explosion due to excessive pressure in the box. However, with conventional control boxes, there is often a risk of intrusion of external dust or liquids into the control box.

SUMMARY OF THE INVENTION

A technical problem solved by the present invention is how to effectively ensure the sealing performance of the control box.

A control box, applied to a display screen, includes:

a box shell, the box shell is provided with an accommodating cavity;

an adapter, the adapter is fixed on the casing, the adapter is provided with a communication hole that communicates with the accommodating cavity, and the communication hole can be matched with a test nozzle to monitor the accommodating cavity airtightness; and

The explosion-proof valve is used to install at the communication hole of the adapter after the test nozzle is separated from the adapter. The explosion-proof valve is provided with a ventilation hole that communicates with the outside world. The gas can be discharged to the outside through the ventilation holes.

In one embodiment, the adapter includes a mounting portion, a pressing portion, and a first sealing member, the mounting portion is connected to the pressing portion, and the cross-sectional dimension of the pressing portion is larger than the mounting portion The cross-sectional dimension of the part, the communication hole penetrates the installation part and the pressing part, the installation part is connected with the casing, and the first seal is sleeved on the installation part and pressed against it between the casing and the pressing portion.

In one of the embodiments, the mounting portion is screwed with the tank shell.

In one embodiment, the explosion-proof valve is further provided with an air guide hole communicating with the accommodating cavity. The air guide hole extends along the axial direction of the explosion-proof valve and has a diameter larger than that of the air hole. The ventilation holes communicate with the air guide holes and are arranged at intervals along the circumference of the explosion-proof valve.

In one embodiment, the explosion-proof valve further includes a liquid-barrier and gas-permeable membrane that blocks liquid and allows gas to pass through. The liquid-barrier and gas-permeable membrane is located in the air guide hole and blocks the air guide hole. The gas permeates the liquid-barrier gas-permeable membrane to be discharged to the outside from the gas-permeable hole.

In one embodiment, the liquid-barrier and gas-permeable film comprises a polytetrafluoroethylene liquid-barrier and gas-permeable film, and the thickness of the liquid-barrier and gas-permeable film is 30 μm to 100 μm.

In one embodiment, the explosion-proof valve includes a connecting portion, a convex ring portion and a second sealing member, the convex ring portion is disposed around the connecting portion and protrudes relative to the surface of the connecting portion, and the air guide hole and the ventilation holes are provided on the connecting part, the connecting part is detachably connected with the adapter, and the second sealing element is pressed between the convex ring part and the adapter.

In one of the embodiments, an inner thread is provided in the communication hole, and the inner thread is engaged with an outer thread on the explosion-proof valve, or the inner thread is engaged with an outer thread on the test nozzle.

In one embodiment, a groove is formed on the outer surface of the casing, and the explosion-proof valve is located in the groove.

A display screen includes light-emitting strips and the control box according to any one of the above, wherein a plurality of the light-emitting strips are arranged on the box shell at intervals, and the light-emitting strips are slidably connected to the box shell.

One technical effect of an embodiment of the present invention is that: by setting the adapter, before installing the explosion-proof valve, the test nozzle adapter can be used to connect with the adapter to test the air tightness of the housing cavity, If the air tightness is good, an explosion-proof valve can be installed to effectively prevent droplets and dust from entering the accommodating cavity from other parts of the box. If the air-tightness of the accommodating cavity cannot meet the requirements, the casing needs to be maintained until the air-tightness of the accommodating cavity meets the requirements. Therefore, the setting of the adapter can effectively ensure the sealing performance of the control box.

Description of drawings

1 is a schematic three-dimensional structure diagram of a display screen provided by an embodiment;

FIG. 2 is a schematic three-dimensional structure diagram of the display screen shown in FIG. 1 when viewed from a frontal perspective;

FIG. 3 is a schematic view of the enlarged structure at the place A in the display screen shown in FIG. 1;

FIG. 4 is a schematic three-dimensional structure diagram of a case in the display screen shown in FIG. 1;

Fig. 5 is the partial structure schematic diagram of the case shown in Fig. 4;

Fig. 6 is the exploded structure schematic diagram of the case shown in Fig. 4;

Fig. 7 is the three-dimensional cross-sectional structural schematic diagram of the control box in the display screen shown in Fig. 1;

FIG. 8 is a schematic three-dimensional structure diagram of the adapter in the control box shown in FIG. 7;

Fig. 9 is a three-dimensional schematic diagram of the explosion-proof valve in the control box shown in Fig. 7;

Figure 10 is a schematic cross-sectional plan view of the adapter and the explosion-proof valve in the control box shown in Figure 7;

Fig. 11 is a three-dimensional cross-sectional structural schematic diagram of the adapter and the explosion-proof valve in the control box shown in Fig. 7;

Fig. 12 is a three-dimensional schematic diagram of the assembly of the light-emitting strip and the fixing member in the display screen shown in Fig. 1;

FIG. 13 is a schematic structural diagram of FIG. 12 from another viewing angle.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may 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 may also be present. The terms "inner", "outer", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment

1 , 2 and 3 at the same time, a display screen 10 provided by an embodiment of the present invention includes a control box 20 and a light-emitting bar 30 , and the control box 20 includes a box shell 101 , an adapter 102 , an explosion-proof valve 103 and control components . The light-emitting strips 30 are connected to the case 101 , the number of the light-emitting strips 30 is multiple, and the plurality of light-emitting strips 30 are evenly spaced so that there is an equal gap 31 between two adjacent light-emitting strips 30 . By arranging and forming the above-mentioned gap 31, on the one hand, light can penetrate between the front side and the rear side of the display screen 10 through the gap 31, thereby improving the light transmission performance of the display screen 10. For example, when the display screen 10 is installed on a glass When installed on the curtain wall, the display screen 10 can not affect the lighting performance of the glass curtain wall. On the other hand, the air flow can pass through the gap 31 between the front side and the rear side of the display screen 10 , thereby reducing the airflow resistance (eg wind resistance) on the display screen 10 and ensuring the stable and reliable installation of the display screen 10 . On the other hand, the heat generated by the light-emitting strip 30 can be quickly discharged from the gap 31 to the outside, so as to improve the heat dissipation performance of the display screen 10 .

In some embodiments, the case 101 includes a base 100 , a cover 200 , a first plug 310 , a second plug 320 and a fastener 330 . The cross-section of the base 100 is approximately a C-shaped structure, and the cross-sectional dimensions of the base 100 are equal everywhere. The base 100 can be made of aluminum alloy and can be formed by extrusion. When the extruded aluminum profile is cut, the bases 100 with different lengths can be formed, so as to meet the requirements of the casing 101 for different lengths. Compared with the box shell 101 formed by die casting, the cutting speed of the extruded aluminum profile is faster, and the shape of the box shell 101 is not affected, thereby improving the processing efficiency of the box shell 101 on the basis of ensuring quality.

2, 5 and 6 at the same time, the first plug 310 is connected to one end of the base 100, and the first plug 310 can be installed on the base 100 in a detachable manner such as bolt connection. The second plug 320 is connected to the other end of the base 100 , and the second plug 320 can also be installed on the base 100 by a detachable connection such as a bolt connection. The base 100 , the first plug 310 and the second plug 320 together form an open accommodating cavity 120 . Since the cross-sectional dimensions of the base 100 are equal everywhere, the cross-sectional dimensions of the accommodating cavity 120 are also equal everywhere. . The cover 200 is connected to the base 100 to cover the open accommodating cavity 120 to form a closed accommodating cavity 120 . The cover 200 can also be detachably installed on the base 100 by means of bolt connection or the like. Of course, the first plug 310 , the second plug 320 and the cover 200 are all pressed against the base 100 with a sealing ring, so as to improve the sealing performance of the accommodating cavity 120 to gas and liquid and prevent external droplets and dust into the accommodating cavity 120 .

The cover 200 is provided with heat dissipation fins 210 . The heat dissipation fins 210 are located outside the accommodating cavity 120 . The disposition of the heat dissipation fins 210 can increase the surface area of the cover 200 , thereby improving the heat dissipation performance of the cover 200 . The control component is accommodated in the accommodating cavity 120, and the control component is used to control the current and signal of the light-emitting strip 30. Since the accommodating cavity 120 has good sealing performance, it can effectively prevent external droplets and dust from entering the accommodating cavity 120. The cavity 120 is used to corrode the air intake of the control components, so as to improve the service life of the entire control box 20 . The control components can be directly fixed on the inner surface of the cover 200 , so that the heat generated by the operation of the control components is directly transferred to the outside through the cover 200 , so the cover 200 can be directly used as a heat sink for the control components.

The first plug 310 has a first end surface 311 , and the first plug 310 includes a first boss 312 , the first boss 312 is connected to the middle of the first end surface 311 , and the first boss 312 protrudes from the first end surface 311 a certain height. The first boss 312 has an inclined surface 312a, the inclined surface 312a and the first end surface 311 have the same orientation, the inclined surface 312a and the first end surface 311 intersect to form an acute angle α, and the value range of the acute angle α is 10° to 40°, for example, the specific value of the acute included angle α may be 10°, 20°, 30° or 40°, etc.

Referring to FIGS. 1 , 4 and 6 simultaneously, the second plug 320 has a second end surface 321 , and the second plug 320 includes two rows of second bosses 322 , and the second bosses 322 are connected to the edge of the second end surface 321 . , the second boss 322 protrudes a certain height relative to the second end surface 321 . The space between the two rows of the second bosses 322 forms the limiting space 302 . For the second bosses 322 in the same row, the number of the second bosses 322 may be one or more, and when the number of the second bosses 322 is multiple, the plurality of second bosses 322 may be arranged at intervals along a straight line. In other embodiments, the second end surface 321 may be recessed to form a sinking groove, and the sinking groove may also form the above-mentioned limiting space 302 .

When a small display screen with a smaller display area is spliced to form a large display screen with a larger display area, for the two small display screens spliced, one of the small display screens is recorded as the first display screen, and the other small display screen is recorded as the first display screen. Second display. When the first display screen and the second display screen are spliced together, 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 on the first display screen is pressed. 312 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. The first end surface 311 on the upper panel is also pressed against the second boss 322 on the second display screen.

If the first end face 311 is not provided with the first boss 312 and the second end face 321 is not provided with the second boss 322, under the condition that the thicknesses of the first plug 310 and the second plug 320 are relatively large, the The distance between the two light-emitting strips 30 closest to each other on the first display screen and the second display screen is larger than the distance between the two light-emitting strips 30 inside the same small display screen, so that the installation accuracy is difficult. If the installation accuracy needs to be met, the thickness of the first plug 310 or the second plug 320 needs to be reduced, which will affect the structural strength of each plug itself, and due to the thickness of the first plug 310 or the second plug 320 If it is thinner, it will also affect the installation of bolts and other assembly conflicts during the splicing process, which eventually leads to the inability 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 that are 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.

In the above embodiment, by disposing the first boss 312 on the first end face 311 and disposing the second boss 322 on the second end face 321 at the same time, the corresponding parts of the first plug 310 and the second plug 320 can be thinned. When the first boss 312 is matched with the limiting space 302, and the first end surface 311 on the first display screen is pressed against the second boss 322 on the second display screen, the first display screen and the second display screen are pressed together. The distance between the two light-emitting strips 30 closest to each other is equal to the distance between the two light-emitting strips 30 inside the same small display screen, so as to ensure the installation accuracy. At the same time, 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. Moreover, the thickness of the part where the second plug 320 has the second boss 322 is relatively thick, which facilitates the installation of bolts during the splicing process and avoids other assembly conflicts, and finally ensures a stable and reliable realization of the first display screen and the second display screen. stitching. Furthermore, the cooperation between 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, so as to prevent the display screen 10 from being displaced under the action of the external force, and further. The stability and reliability of the splicing of the display screen 10 is improved. Therefore, this setting can take into account both the installation accuracy and the stability and reliability of the display screen 10 after splicing.

In addition, after the two display screens 10 are spliced, since the first boss 312 is provided with an inclined surface 312a that forms an acute angle with the first end face 311, the inclined surface 312a can ensure that the space between the two display screens 10 after splicing is ensured. A certain angle is formed, that is, the light-emitting surfaces of the two display screens 10 can be intersected to form an included angle, so as to ensure that the large display screen 10 formed by splicing has a certain degree of 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 setting the inclined surface 312a, the curvature of the light-emitting surface of the large display screen 10 can be reasonably adjusted, so as to meet various splicing requirements.

3 , 12 and 13 , in some embodiments, the fixing member 330 is installed on the base 100 , for example, the fixing member 330 can be fixed on the base 100 by means of bolt connection. The fixing member 330 includes two sliding blocks 331 , the two sliding blocks 331 are arranged opposite to each other, the light-emitting strip 30 is sandwiched between the two sliding blocks 331 , and the sliding blocks 331 provide a good support for the installation of the light-emitting strip 30 . Of course, sliding grooves 32 can be provided on two sides of the light-emitting strip 30, and the two sliding blocks 331 are slidably matched with the sliding grooves 32, so that the entire case 101 slides relative to the light-emitting strip 30 along the lengthwise extending direction of the light-emitting strip 30, thereby changing the The installation position of the case 101 on the light-emitting strip 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-emitting strip 30 to change the installation position, the box shell 101 can avoid the relevant The obstacles are suitable for different installation conditions, so as to improve the applicability of the display screen 10 to various installation conditions.

Referring to FIG. 2 , FIG. 3 and FIG. 4 simultaneously, in some embodiments, grooves 110 are recessed on the outer surface of the base 100 , and the first plug 310 and the second plug 320 are both provided with drainage holes 301 . The drain hole 301 and the groove 110 communicate with each other. By providing the drainage holes 301, the accumulated water in the groove 110 can be discharged in real time, preventing the accumulated water staying in the groove 110 for a long time from entering the interior of the accommodating cavity 120 to erode the control components, and also preventing the accumulated water from affecting the entire casing. 101 constitutes corrosion.

3, 7 and 8. In some embodiments, the adapter 102 is fixed on the case 101, and the adapter 102 is provided with a communication hole 440, which can communicate with the accommodating cavity 120 and the outside world. When the test nozzle is inserted into the communication hole 440 and matched with the communication hole 440 , the air tightness of the accommodating cavity 120 can be tested through the test nozzle, so as to test the sealing performance of the accommodating cavity 120 against gas and liquid. The communication hole 440 is a threaded hole provided with an inner thread, and the test nozzle is provided with an outer thread. When the test nozzle is matched with the communication hole 440, the outer thread on the test nozzle and the inner thread in the communication hole 440 are engaged with each other, thereby making the test The nozzle is fixed on the adapter 102 by means of screw connection for air tightness test.

8, 10 and 11 at the same time, specifically, the adapter 102 includes 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 may be coaxially disposed, and the cross-sectional dimension of the pressing portion 420 is larger than that of the mounting portion 410 . The communication hole 440 may be a circular hole, and the communication hole 440 penetrates both the mounting portion 410 and the pressing portion 420 . The mounting portion 410 is connected to the case 101. For example, an external thread is provided on the mounting portion 410, and a fastening hole is provided on the base 100 of the case 101. The fastening hole is a threaded hole with an internal thread. When tightening the hole and engaging the external thread with the internal thread, the mounting portion 410 can be fixed on the casing 101 by means of threaded connection to ensure that the adapter 102 is detachable relative to the casing 101 . Of course, the mounting portion 410 can also be fixed on the base 100 by means of snap connection.

The first sealing member 430 can be an O-ring, the first sealing member 430 is sleeved on the mounting portion 410 , and when the mounting portion 410 is inserted into the fastening hole, the first sealing member 430 is pressed against the base 100 and the abutment. between the pressing parts 420, so that the first sealing member 430 can form a good sealing effect on the fastening hole.

9, 10 and 11 at the same time, in some embodiments, the explosion-proof valve 103 can cooperate with the communication hole 440, the explosion-proof valve 103 is provided with a ventilation hole 521, and the ventilation hole 521 is directly connected to the outside world. The gas can be discharged to the outside through the ventilation holes 521 . The accommodating cavity 120 has good air tightness, so that external liquid and dust cannot enter the accommodating cavity 120 to erode the control components. However, when the control components work, the heat generated makes the air pressure in the accommodating cavity 120 higher than When the external atmospheric pressure is used, although the gas in the accommodating cavity 120 cannot be discharged from other parts of the box shell 101, it can be discharged to the outside through the ventilation holes 521, so that the accommodating cavity 120 has a certain pressure relief effect, preventing the entire box Shell 101 explodes.

The explosion-proof valve 103 includes a liquid-proof and gas-permeable membrane 510 , a connecting portion 520 , a convex ring portion 530 and a second sealing member 540 . Both the connecting portion 520 and the convex ring portion 530 may be coaxially arranged columnar structures. The convex ring portion 530 is disposed around the middle of the connecting portion 520 , and the convex ring portion 530 protrudes radially to a certain height relative to the side peripheral surface of the connecting portion 520 . The connecting portion 520 is provided with an air guide hole 501 , and the air guide hole 501 extends along the axial direction of the connecting portion 520 . The ventilation hole 521 is opened at a position close to the end of the connecting portion 520, and the ventilation hole 521 and the air guiding hole 501 are communicated with each other. The plurality of ventilation holes 521 can be evenly spaced along the circumferential direction of the connecting portion 520. For example, the number of ventilation holes 521 can be four or six. According to the actual needs, the number of ventilation holes 521 can be appropriately increased or decreased. . The diameter of the ventilation hole 521 is smaller than that of the air guide hole 501 .

The connecting portion 520 is provided with an external thread. When the connecting portion 520 is matched with the communicating hole 440, the external thread on the connecting portion 520 and the internal thread in the communicating hole 440 are engaged with each other, so that the entire explosion-proof valve 103 is fixed by means of threaded connection. On the adapter 102 , obviously, the explosion-proof valve 103 is detachably connected to the adapter 102 . The second sealing member 540 can also be an O-ring. 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 against the convex ring portion. 530 and the pressing portion 420 of the adapter 102 , so that the second sealing element 540 has a good sealing effect on the communication hole 440 of the adapter 102 .

In some embodiments, the liquid-barrier and gas-permeable film 510 includes a polytetrafluoroethylene liquid-barrier and gas-permeable film 510, that is, the liquid-barrier and gas-permeable film 510 can be made of a polytetrafluoroethylene material, so that the liquid cannot penetrate the liquid-barrier and gas-permeable film 510, At the same time, the liquid barrier and gas permeable membrane 510 can be cast through and penetrated, that is, the liquid barrier gas permeable membrane 510 can prevent the passage of liquid and the passage of operating gas. The thickness of the liquid-barrier and gas-permeable film 510 may range from 30 μm to 100 μm. For example, the specific thickness of the liquid-barrier gas-permeable film 510 may be 30 μm, 40 μm, 70 μm, or 100 μm.

The liquid barrier and breathable membrane 510 is located in the air guide hole 501, and the liquid barrier breathable film 510 is connected to the inner wall of the air guide hole 501, thereby forming a blocking effect on the air guide hole 501. For the gas entering the air guide hole 501 from the accommodating hole, the gas must be permeable. The gas that passes through the liquid barrier and breathable membrane 510 and is discharged to the outside through the ventilation holes 521 . Similarly, the gas entering the ventilation holes 521 from the outside must pass through the liquid barrier and breathable membrane 510 and enter the accommodating cavity 120 through the gas guide holes 501 .

By arranging the liquid-barrier and breathable membrane 510, the droplets and dust entering the ventilation holes 521 from the outside cannot continue to pass through the liquid-barrier and breathable membrane 510 and enter the accommodating cavity 120 through the air guide holes 501, thereby effectively avoiding the control of external droplets and dust. Erosion of components. However, when the heat generated by the operation of the control components makes the air pressure in the accommodating cavity 120 higher than the outside atmospheric pressure, the gas in the accommodating cavity 120 can pass through the liquid-barrier gas-permeable membrane 510 and be discharged to the outside through the ventilation holes 521, so that the The accommodating cavity 120 has a good pressure relief effect, preventing the entire box shell 101 from exploding, and improving the safety of the entire control box 20 in use. Therefore, on the one hand, the explosion-proof valve 103 can play an explosion-proof role to ensure the safety of the control box 20, and on the other hand, it can prevent external droplets and dust from eroding the control components in the accommodating cavity 120, that is, the explosion-proof valve 103 can The control components play a good protective role, thereby improving the service life of the control box 20 .

Before the explosion-proof valve 103 is installed, the test nozzle is matched with the communication hole 440 on the adapter 102 to test the air tightness of the entire accommodating cavity 120 . For example, gas is input into the accommodating cavity 120 through the test nozzle, so that the air pressure in the accommodating cavity 120 is higher than the atmospheric pressure, after a period of time, when the pressure value of the pressure gauge connected to the test nozzle remains unchanged , indicating that there is no air leakage in the box shell 101, and the entire accommodating cavity 120 has good air tightness. At this time, the test nozzle is unloaded from the adapter 102, and the explosion-proof valve 103 is installed on the adapter 102. That's it. If the pressure value of the barometer drops after a period of time, it indicates that the case 101 is leaking, the airtightness of the accommodating cavity 120 is poor, and the entire case 101 must be maintained.

If the adapter 102 is not provided, before the explosion-proof valve 103 is installed in the casing 101 , the user cannot test the air tightness of the accommodating cavity 120 through the test nozzle. 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 casing 101 , the droplets and dust will intrude into the accommodating cavity 120 from the weaker sealing part of the casing 101 . , that is, droplets and dust can bypass the explosion-proof valve 103 and enter the accommodating cavity 120 . In the above embodiment, by setting the adapter 102, before installing the explosion-proof valve 103, the air-tightness of the accommodating cavity 120 can be tested. If the air-tightness is good, the explosion-proof valve 103 can be installed, thereby effectively preventing droplets and dust. Intrusion into the accommodating cavity 120 from other parts of the casing 101 . If the airtightness of the accommodating cavity 120 cannot meet the requirements, the case 101 needs to be maintained until the accommodating cavity 120 has good airtightness.

7, since the base 100 has a groove 110, the adapter 102 can be arranged in the groove 110. After the explosion-proof valve 103 is connected with the adapter 102, the explosion-proof valve 103 will also be located in the groove 110. middle. By locating the adapter 102 and the explosion-proof valve 103 in the groove 110, the groove 110 can accommodate the explosion-proof valve 103 to a certain extent, so that the base 100 can protect the explosion-proof valve 103, making the explosion-proof valve 103 difficult to Contact with external droplets and dust, thereby reducing the corrosive effect of droplets and dust on the explosion-proof valve 103 . At the same time, it is difficult for the external impact force to directly act on the explosion-proof valve 103 to avoid damage to the explosion-proof valve 103 caused by the impact force or affect the stability and reliability of the installation of the explosion-proof valve 103 .

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims (10)

1. A control box, applied to a display screen, is characterized in that, comprising: a box shell, the box shell is provided with an accommodating cavity; an adapter, the adapter is fixed on the casing, the adapter is provided with a communication hole that communicates with the accommodating cavity, and the communication hole can be matched with a test nozzle to monitor the accommodating cavity airtightness; and The explosion-proof valve is used to install at the communication hole of the adapter after the test nozzle is separated from the adapter. The explosion-proof valve is provided with a ventilation hole that communicates with the outside world. The gas can be discharged to the outside through the ventilation holes. 2 . The control box according to claim 1 , wherein the adapter comprises a mounting part, a pressing part and a first sealing part, the mounting part is connected with the pressing part, and the pressing The cross-sectional dimension of the mounting portion is larger than that of the mounting portion, the communicating hole penetrates the mounting portion and the pressing portion, the mounting portion is connected to the casing, and the first seal is sleeved on the mounting portion and pressed between the casing and the pressing portion. 3 . The control box according to claim 2 , wherein the mounting portion is connected with the casing by screw threads. 4 . 4 . The control box according to claim 1 , wherein the explosion-proof valve is further provided with an air guide hole communicating with the accommodating cavity, and the air guide hole extends along the axial direction of the explosion-proof valve and has a diameter larger than The diameter of the ventilation hole, the ventilation hole communicates with the air guide hole and is arranged at intervals along the circumferential direction of the explosion-proof valve. 5 . The control box according to claim 4 , wherein the explosion-proof valve further comprises a liquid-barrier and gas-permeable membrane that blocks liquid and allows gas to pass through, the liquid-barrier gas-permeable membrane is located in the air guide hole and blocks the Air-guiding holes, the gas in the air-guiding holes permeates the liquid-barrier gas-permeable membrane to be discharged to the outside from the gas-permeable holes. 6 . The control box according to claim 5 , wherein the liquid-proof and breathable film comprises a polytetrafluoroethylene liquid-proof and breathable film, and the thickness of the liquid-proof and breathable film is 30 μm to 100 μm. 7 . 7 . The control box according to claim 4 , wherein the explosion-proof valve comprises a connecting portion, a convex ring portion and a second sealing member, and the convex ring portion is disposed around the connecting portion and is opposite to the connecting portion. 8 . The surface is protruding, the air guide hole and the air hole are both arranged on the connecting part, the connecting part is detachably connected with the adapter, and the second sealing part is pressed against the convex ring part and the connecting part. between the adapters. 8 . The control box according to claim 1 , wherein an inner thread is provided in the communication hole, and the inner thread is engaged with an outer thread on the explosion-proof valve, or the inner thread is The male thread on the test tip engages. 9 . The control box according to claim 1 , wherein a groove is formed on the outer surface of the casing, and the explosion-proof valve is located in the groove. 10 . 10. A display screen, characterized in that it comprises a light-emitting strip and the control box according to any one of claims 1 to 9, a plurality of the light-emitting strips are arranged on the box shell at intervals, and the light-emitting strips are connected to the control box. The casings are slidably connected.

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