Patent ID: 12207427

The drawings include the following reference signs:10. Box body;20. Power box;21. First wiring hole;30. Display module;31. Second connecting cylinder;40. Sealing assembly;41. Sealing frame;411. Second wiring hole;412. Base;413. First connecting cylinder;42. First elastic seal ring;421. Third connecting section;422. Second deformation section;423. Fourth connecting section;43. Second elastic seal ring;431. First connecting section;432. First deformation section;433. Second connecting section;44. First annular pressing plate;45. Second annular pressing plate;50. Limiting structure;51. Limiting cylinder;53. Annular limiting plate; and54. Annular projection.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solutions in the embodiments of the disclosure will be clearly and completely described below in combination with the drawings in the embodiments of the disclosure, and it is apparent that the described embodiments are not all but part of the embodiments of the disclosure. In fact, the description of at least one exemplary embodiment below is merely illustrative, and will not be taken as any limitation to the disclosure and its application or use. All other embodiments obtained by those of ordinary skill in the art on the basis of the embodiments in the disclosure without creative work shall fall within the scope of protection of the disclosure.

As shown inFIGS.1-7, the embodiments of the disclosure provide an LED display screen, which includes a box body10, a power box20, a display module30and a sealing assembly40. The power box20and the display module30are both disposed on the box body10, the power box20is provided with a first wiring hole21, and an electric device in the power box20is electrically connected with the display module30through a connecting wire penetrating through the first wiring hole21. The sealing assembly40includes: a sealing frame41, a first elastic seal ring42and a second elastic seal ring43, the sealing frame41is disposed at the first wiring hole21and provided with a second wiring hole411for avoiding the connecting wire, a floating gap is formed between the sealing frame41and the power box20, the first elastic seal ring42is disposed on the sealing frame41and surrounds the second wiring hole411, the display module30is connected with the sealing frame41and is in butt fit with the first elastic seal ring42so as to seal a joint of the display module30and the sealing frame41, an outer side of the second elastic seal ring43is connected with the power box20, an inner side of the second elastic seal ring43is connected with the sealing frame41and surrounds the second wiring hole411so as to seal the floating gap, and the sealing frame41is supported by the second elastic seal ring43so that the sealing frame41is disposed in a floating mode relative to the power box20.

With the adoption of the LED display screen provided by the embodiment, the LED display screen includes the box body10, the power box20, the display module30and the sealing assembly40, the joint of the display module30and the sealing frame41is sealed by the first elastic seal ring42and the joint of the sealing frame41and the display module30is sealed by the second elastic seal ring43, thereby preventing rainwater from entering into the power box20through the first wiring hole21or the second wiring hole411and preventing internal circuit of the power box20from scrap caused by short circuit. The floating gap is formed between the sealing frame41and the power box20, the sealing frame41is supported by the second elastic seal ring43, therefore, when a position offset occurs between the display module30and the power box20, the sealing frame41is enabled to float relative to the power box20by utilizing elastic deformation of the second elastic seal ring43, so that the position offset between the display module30and the power box20is eliminated, the position offset between the sealing frame41and the display module30is reduced, thereby ensuring an even distribution of the amount of compression deformation of the first elastic seal ring around its circumference, promoting the use reliability of the sealing assembly40, further, avoiding short circuit of the internal circuit caused by water entering into the power box20, prolonging the service life of the LED display screen, and promoting the use safety of the LED display screen.

In the related art, the sealing structure between the display module30and the power box20includes the following two ways.

The first (Comparative Example 1) is: an elastic seal ring is disposed on the front face of the power box20and surrounds the first wiring hole21, the display module30is disposed on the box body10such that the first wiring hole21and the second wring hoe411are aligned, the elastic seal ring is clamped between the power box20and the display module30in the front-rear direction, and the longitudinal section of the elastic seal ring adopts a hollow structure.

The second (Comparative Example 2) is: one end of the sealing frame is fixed to the front face of the power box20and surrounds the first wiring hole21, the elastic seal ring sleeves the sealing frame and surrounds the first wiring hole21, the display module30is disposed on the box body10such that the other end of the sealing frame penetrates into the insertion hole of the display module30, the elastic seal ring is clamped between the outer wall of the sealing frame and the hole wall of the insertion hole of the display module30, and an annular protrusion is disposed on the outer side wall of the elastic seal ring around its axis.

However. Comparative Example 1 has the problem that the sealing effect of the elastic seal ring is unreliable or the display effect of the LED display screen is poor; in a case where there is an installation error between the display module30and the power box20, Comparative Example 2 has the problem that the sealing effect of the elastic seal ring is poor or the display effect of the LED display screen is poor.

Meanwhile, through detailed analytical studies on both structures by the inventor, it is found that in Comparative Example 1, the elastic seal ring is disposed on the front face of the power box20, the compression deformation force of the elastic seal ring acts on the back face of the display module30, the elastic seal ring pushes the display module30to be separated from the box body10or pushes the display module30to deform, such that the elastic seal ring is unable to normally seal the first wiring hole21and the second wiring hole411, or the elastic seal ring pushes the display module30to deform, so that the display effect of the LED display screen is affected; it is found that in Comparative Example 2, when there is an installation error between the display module30and the power box20, the sealing frame has a position offset in the radial direction of the insertion hole of the display module30relative to the insertion hole of the display module30, since the elastic seal ring is clamped between the outer wall of the sealing frame and the hole wall of the insertion hole of the display module30, the amount of compression of the elastic seal ring in its circumference is non-uniform, on the one hand, a position with a small amount of compression of the elastic seal ring is not able to effectively seal the first wiring hole21and the second wiring hole411, such that water enters into the power box20to cause a short circuit of the internal circuit, on the other hand, the compression deformation forces generated by the elastic seal ring in its circumference are non-uniform, the second wiring hole411is subjected to the imbalance forces around its circumferential direction from the elastic seal ring, after the second wiring hole411reaches force balance, the position of the display module30on the box body10has an offset under the action of the elastic seal ring, resulting in uneven spacing between the display modules30, further resulting in light or dark lines of the LED display screen, which affects the display effect of the LED display screen.

The power box20and the box body10are of separate structures, the first wiring hole21is formed in the front face of the power box20, the side the power box20is provided with connecting plates, the back face of the connecting plate attaches to the front face of the box body10, and the connecting plate is fixed to the front face of the box body10by fasteners, thereby the power box20is fixed to the front face of the box body10.

As shown inFIGS.5and7, the second elastic seal ring43includes a first connecting section431, a first deformation section432and a second connecting section433which are sequentially connected from outside to inside, the first connecting section431, the first deformation section432and the second connecting section433are all annular, the first connecting section431is connected with the power box20, the second connecting section433is connected with the sealing frame41and located on an outer side of the second wiring hole411, and at least part of a longitudinal section of the first deformation section432is of an arc-shaped structure. When a position offset occurs between the display module30and the power box20, since the first connecting section431, the first deformation section432and the second connecting section433are annular, such that the second elastic seal ring43is capable of absorbing position offsets of the display module30from the power box20in various directions, while the position offset between the sealing frame41and the display module30is reduced, the axis of the second wiring hole411of the sealing frame41is always perpendicular to the box body10, then short circuit of the internal circuit of the display module30caused by failure of the sealing assembly40is avoided, the service life of the LED display screen is prolonged, and the use safety of the LED display screen is improved. Moreover, since at least part of the longitudinal section of the first deformation section432is of an arc-shaped structure, when a position offset occurs between the display module30and the power box20, the first deformation section432is capable of deforming to absorb the position offset between the display module30and power box20, so that the sealing waterproofing effect of the first elastic seal ring42on the display module30is further guaranteed.

It is to be noted that the longitudinal section of the first deformation section432includes an arc-shaped structure refers to that the longitudinal section of the first deformation section432is all of the arc-shaped structure, or the longitudinal section of the first deformation section432is partially of an arc-shaped structure.

The longitudinal section of the first deformation section432refers to the cross-section of the first deformation section432taken in the up-down direction inFIG.5, in which direction the section of the first deformation section432includes the arc-shaped structure.

As shown inFIGS.5and7, a whole of the longitudinal section of the first deformation section432is arc-shaped, and a middle part of the first deformation section432protrudes towards a direction away from the sealing frame41. The whole of the longitudinal section of the first deformation section432is arc-shaped, when the first deformation section432is subjected to the action force of the same magnitude, the amount of deformation generated by the first deformation section432increases, the first deformation section432is more prone to deformation, when a position offset occurs between the display module30and the power box20, the first deformation section432is capable of absorbing most of the position offset between the display module30and power box20, then the position offset between the sealing frame41and the display module30is further reduced, and the sealing waterproofing effect of first elastic seal ring42on the display module30is further guaranteed.

As shown inFIGS.3,5and7, the sealing assembly40further includes a first annular pressing plate44, which is connected with the power box20, and the first connecting section431is clamped between the first annular pressing plate44and the power box20. The first connecting section431is clamped between the first annular pressing plate44and the power box20, and when the first deformation section432has elastic deformation, reliable connection between the first connecting section431and the power box20is guaranteed, thereby improving the use reliability of the LED display screen.

As shown inFIGS.3,5and7, the sealing assembly40further includes a second annular pressing plate45, which is connected with the sealing frame41, and the second connecting section433is clamped between the second annular pressing plate45and the sealing frame41. The second connecting section433is clamped between the second annular pressing plate45and the sealing frame41, and when the first deformation section432has elastic deformation, reliable connection between the second connecting section433and the sealing frame41is guaranteed, thereby improving the use reliability of the LED display screen.

As shown inFIG.5, the sealing frame41includes a base412and a first connecting cylinder413disposed on the base412, the second wiring hole411is formed by an inner space of the first connecting cylinder413, the display module30is provided with a second connecting cylinder31, the first connecting cylinder413is in plug-in connection with the second connecting cylinder31, and the first elastic seal ring42is clamped between the first connecting cylinder413and the second connecting cylinder31in a radial direction of the second wiring hole411. The first connecting cylinder413is in plug-in connection with the second connecting cylinder31, and the first elastic seal ring42is clamped between the first connecting cylinder413and the second connecting cylinder31, so that the first elastic seal ring42generates compression deformation under squeezing of the sealing frame41and the second connecting cylinder31in the radial direction thereof, the first elastic seal ring42seals the gap between the first connecting cylinder413and the second connecting cylinder31, preventing the rainwater from entering into the display module30through the through hole enclosed by the second connecting cylinder31, the service life of the LED display screen is prolonged, and the use safety of the LED display screen is improved. Meanwhile, since the direction of the compression deformation force of the first elastic seal ring42acting on the display module30is parallel to the display module30, the display module30is not subjected to the compression deformation force of the first elastic seal ring42in the front-rear direction, preventing the first elastic seal ring42from pushing the display module30to be separated from the box body10or from pushing the display module30to deform, the first elastic seal ring42normally seals the first wiring hole21and the second wiring hole411, the display picture of the display module30is guaranteed, and the display effect of the LED display screen is guaranteed.

A shown inFIG.5, in the embodiment, the first connecting cylinder413penetrates in the second connecting cylinder31, the first elastic seal ring42is clamped between the outer side wall of the first connecting cylinder413and the inner side wall of the second connecting cylinder31, in other embodiments, the second connecting cylinder31penetrates in the first connecting cylinder413, and the first elastic seal ring42is clamped between the inner side wall of the first connecting cylinder413and the outer side wall of the second connecting cylinder31.

As shown inFIGS.5and7, the first elastic seal ring42includes a third connecting section421, a second deformation section422and a fourth connecting section423which are sequentially connected along an axial direction of the second wiring hole411, the third connecting section421, the second deformation section422and the fourth connecting section423are all annular, both the third connecting section421and the fourth connecting section423abut against a cylinder wall of the first connecting cylinder413, the second deformation section422protrudes out of the third connecting section421and the fourth connecting section423in the radial direction of the second wiring hole411, the second deformation section422abuts against a cylinder wall of the second connecting cylinder31, and at least part of a longitudinal section of the second deformation section422is wave-shaped. At a certain amount of deformation of the second deformation section422, since at least part of the longitudinal section of the second deformation section422is wave-shaped, the second deformation section422is able to provide a greater elastic force, thereby guaranteeing the sealing effect of the second deformation section422on the gap between the through hole enclosed by the second connecting cylinder31and the sealing frame41, prolonging the service life of the LED display screen, and improving the use safety of the LED display screen,

It is to be noted that the second deformation section422protrudes out of the third connecting section421and the fourth connecting section423in the radial direction of the sealing frame41refers to that the maximum diameter of the second deformation section422is greater than the maximum diameter of the third connecting section421and the maximum diameter of the second deformation section422is greater than the maximum diameter of the fourth connecting section423in the axial direction of the sealing frame41.

The radial direction of the sealing frame41refers to the left-right direction inFIG.5, and the axial direction of the sealing frame41refers to the up-down direction inFIG.5.

It is to be noted that the longitudinal section of the second deformation section422includes a wave-shaped structure refers to that the longitudinal section of the second deformation section422is all of the wave-shaped structure, or the longitudinal section of the second deformation section422is partially of the wave-shaped structure.

The longitudinal section of the second deformation section422refers to the cross-section of the second deformation section422taken in the up-down direction inFIG.5, in which direction the section of the second deformation section422includes the arc-shaped structure.

In the embodiment, the first deformation section432is prone to deformation compared with the second deformation section422. When a position offset occurs between the display module30and the power box20, since the first deformation section432is prone to deformation compared with the second deformation section422, the amount of deformation generated by the first deformation section432is greater than the amount of deformation generated by the second deformation section422, so that the first deformation section432is capable of absorbing most of the position offset between the display module30and power box20, then the position offset between the sealing frame41and the display module30is further reduced, and the sealing waterproofing effect of second elastic seal ring422on the display module30is guaranteed.

It is to be noted that, the first deformation section432is prone to deformation compared with the second deformation section422under the condition that the first deformation section432and the second deformation section422adopt the same material may be implemented in three ways.

In the first way, the longitudinal section of the first deformation section432is an arc-shaped section, the longitudinal section of the second deformation section422is a wavy shape formed by bending for a plurality of times at an acute angle, since the bending frequency and bending degree of the first deformation section432are smaller than those of the second deformation section422, so that the first deformation section432is prone to deformation compared with the second deformation section422.

In the second way, the thickness of the first deformation section432is smaller than the thickness of the second deformation section422such that the first deformation section432is further more prone to deformation compared with the second deformation section422.

In the third way, the longitudinal section of the first deformation section432is an arc-shaped section, the longitudinal section of the second deformation section422is a wavy shape formed by bending for a plurality of times at an acute angle, the thickness of the first deformation section432is smaller than that of the second deformation section422, so that the first deformation section432is further more prone to deformation compared with the second deformation section422.

Of course, that the first deformation section432is prone to deformation compared with the second deformation section422is not limited to the above three ways, as long as the amount of deformation generated by the first deformation section432is greater than the amount of deformation generated by the second deformation section422under the condition that the first deformation section432and the second deformation section422are subjected to the action force of the same magnitude.

As shown inFIGS.5and7, a limiting structure50is disposed between the sealing frame41and the power box20to limit a moving stroke of the sealing frame41relative to the power box20. The limiting structure50limits the moving stroke of the sealing frame41when floating relative to the power box20, so that excessive moving stroke of the sealing frame41when floating relative to the power box20is avoided, it is ensured that the amount of deformation generated by the first deformation section432is within a structurally reliable range, damage to the first deformation section432is avoided, and the use reliability of the LED display screen is improved.

It is to be noted that the moving stroke of the sealing frame41relative to the power box20refers to the displacement of the sealing frame41compared to its initial state in which it is unstressed.

As shown inFIGS.5and7, the limiting structure50includes a limiting cylinder51disposed on a bottom wall of the sealing frame41and surrounding the second wiring hole411, the limiting cylinder51extends downwards into the first wiring hole21, and the floating gap includes a lateral floating gap formed between the limiting cylinder51and a hole wall of the first wiring hole21. When the sealing frame41moves relative to the power box20in the radial direction of the sealing frame41, since the lateral floating gap is formed between the limiting cylinder51and the hole wall of the first wiring hole21, by utilizing the limiting effect of the first wiring hole21on the limiting cylinder51, the excessive moving stroke of the sealing frame41relative to the power box20is avoided, damage to the first deformation section432is avoided, and the use reliability of the LED display screen is improved. Moreover, at a certain size of the second wiring hole411, the size of the limiting cylinder51can be reduced since the limiting cylinder51downwards extends into the first wiring hole21.

As shown inFIG.5, the inner side of the second elastic seal ring43is connected with the bottom wall of the sealing frame41and located on an inner side of the limiting cylinder51, and the outer side of the second elastic seal ring43is connected with an inner surface of a top wall of the power box20. With the adoption of the above structure, the lateral floating gap can be sealed by utilizing the second elastic seal ring43, then the sealing effect of the sealing assembly40is guaranteed, the service life of the LED display screen is prolonged, and the use safety of the LED display screen is improved.

The outer diameter of the limiting cylinder51is smaller than the hole diameter of the first wiring hole21, the limiting cylinder51movably penetrates in the first wiring hole21, by utilizing the limiting effect of the first wiring hole21on the limiting cylinder51, the excessive moving stroke of the sealing frame41relative to the power box20is avoided, damage to the first deformation section432is avoided, and the use reliability of the LED display screen is improved.

It is to be noted that the limiting cylinder51surrounds the second wiring hole411refers to that the limiting cylinder51surrounds outside the second wiring hole411, and the limiting cylinder51is equally spaced from the second wiring hole411.

As shown inFIGS.5and7, the limiting structure50further includes an annular limiting plate53and an annular projection54, the annular limiting plate53is disposed on a side wall of the sealing frame41and surrounds the second wiring hole411, the limiting cylinder51extends upwards to a lower surface of the limiting plate53, the annular projection54is disposed on an outer surface of the top wall of the power box20and surrounds the first wiring hole21, and the floating gap further includes a longitudinal floating gap formed between the lower surface of the annular limiting plate53and an upper surface of the annular projection54. When the sealing frame41moves close to the box body10relative to the power box20, since the longitudinal floating gap is formed between the lower surface of the annular limiting plate53and the upper surface of the annular projection54, when the lower surface of the annular limiting plate53abuts against the upper surface of the annular projection54, by utilizing the limiting effect of the annular projection54on the annular limiting plate53, the excessive moving stroke of the sealing frame41relative to the power box20is avoided, damage to the first deformation section432is avoided, and the use reliability of the LED display screen is improved.

It is to be noted that a floating gap of the sealing frame41is formed between the lower surface of the annular limiting plate53and the upper surface of the annular projection54refers to the gap between the lower surface of the annular limiting plate53and the upper surface of the annular projection54, and the sealing frame41is capable of floating relative to the power box20in the gap when the first deformation section432deforms under force.

In the embodiment, the LED display screen includes a plurality of display modules30and a plurality of sealing assemblies40, the plurality of display modules30being disposed in one-to-one correspondence with the plurality of sealing assemblies40. Thus, for the LED display screen, a sealing waterproofing effect can be achieved on the display modules30corresponding to the sealing assemblies40through the plurality of sealing assemblies.

It is to be noted that, the first elastic seal ring42is disposed on the sealing frame41and abuts against the display module30includes the following two embodiments.(1) The first elastic seal ring42sleeves the side wall of the sealing frame41, and abuts against the display module30in a direction vertical to the axis of the first elastic seal ring42.(2) In the axial direction of the first elastic seal ring42, the first elastic seal ring42includes a first section and a second section which are connected, the first section of the first elastic seal ring42sleeves the side wall of the sealing frame41, the second section of the first elastic seal ring42is disposed on the end wall, away from the power box20, of the sealing frame41, and in the axial direction of the first elastic seal ring42, the second section of the first elastic seal ring42abuts against the display module30.

The LED display screen provided by the embodiment has the following beneficial effects.(1) When position offset occurs between the display module30and the power box20, the sealing frame41is enabled to float relative to the power box20by utilizing elastic deformation of the second elastic seal ring43, so that the position offset between the display module30and the power box20is eliminated, the position offset between the sealing frame41and the display module30is reduced, thereby ensuring an even distribution of the amount of compression deformation of the first elastic seal ring42around its circumference, promoting the use reliability of the sealing assembly40, further, avoiding short circuit of the internal circuit caused by water entering into the power box20, prolonging the service life of the LED display screen, and promoting the use safety of the LED display screen.(2) When position offset occurs between the display module30and the power box20, the first deformation section432is prone to deformation compared with the second deformation section422, the amount of deformation generated the first deformation section432is greater than the amount of deformation generated by the second deformation section422, so that the first deformation section432is capable of absorbing most of the position offset between the display module30and power box20, then position offset between the sealing frame41and the display module30is further reduced, and the sealing waterproofing effect of second deformation section422on the display module30is guaranteed.(3) The limiting structure50limits the moving stroke of the sealing frame41when floating relative to the power box20, so that excessive moving stroke of the sealing frame41when floating relative to the power box20is avoided, it is ensured that the amount of deformation generated by the first deformed section432is within a structurally reliable range, damage to the first deformed section432is avoided, and the use reliability of the LED display screen is improved.

The above is only preferred embodiments of the disclosure and is not intended to limit the disclosure. Those skilled in the art may make various modifications and variations. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the disclosure shall fall within the scope of protection of the disclosure.