Waterproof and dustproof structure of photovoltaic mounting plate frame junction box

Abstract

The utility model relates to the technical field of photovoltaic junction boxes, in particular to a waterproof and dustproof structure of a photovoltaic mounting plate frame junction box, which comprises a box body provided with an internal thread groove and an internal groove communicated with the internal thread groove. The sealing ring is arranged in the inner groove; and the threaded sleeve is provided with a through hole, and the threaded sleeve is in threaded fit with the internal thread groove to generate axial pressure on the sealing ring, so that the sealing ring is forced to deform and extrude the cable. According to the utility model, the glue filling cavity is arranged in the box body, and one side of the glue filling cavity is opened and is attached to the sealing ring, so that the pouring glue can be contacted with the sealing ring, and when the thread bushing is screwed to enable one end of the thread bushing to extrude the sealing ring along the axial direction, the sealing ring deforms to extrude a cable, and meanwhile, the sealing ring is prevented from being damaged. When the cable is sealed, the sealing ring can extrude the pouring sealant in the sealant pouring cavity, the pouring sealant can gradually permeate into the gap between the sealing ring and the cable so as to seal the gap, and after the pouring sealant is cooled, the cable can be fully sealed.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic junction box technical field especially relates to a waterproof and dustproof structure of photovoltaic mounting plate frame junction box. BACKGROUND

[0002] The junction box is generally installed at the back of the photovoltaic module and is used for connecting the solar cell circuit inside the photovoltaic module with the external circuit, so that the electric energy can be delivered out. Since the photovoltaic module and the junction box are exposed to the outdoor environment all the year round, they need to withstand the challenges of weather such as wind and rain, wind and sand, floating dust, high temperature and high cold. Therefore, improving the waterproof and dustproof performance of the junction box is beneficial to prolong the service life of the photovoltaic equipment.

[0003] At present, the existing waterproof technology mainly uses a sealing ring to prevent water and dust. By compressing the sealing ring, the sealing ring is deformed to a certain extent, thereby playing a sealing role between the cable and the cable outlet hole on the junction box. However, since the deformation of the sealing ring under pressure is uncontrollable and uneven, the sealing ring may be too tight or too loose between the local cable. Therefore, even if the sealing ring is very soft, it cannot fully fill all the gaps between the cable and the cable outlet hole. After a long period of use, some water vapor will still enter the photovoltaic junction box through the gaps, causing damage to the electronic equipment in the photovoltaic junction box. SUMMARY

[0004] Therefore, the utility model provides a waterproof and dustproof structure of photovoltaic mounting plate frame junction box to solve the technical problem of poor waterproof and dustproof effect of the existing photovoltaic junction box.

[0005] To achieve the above purpose, the utility model provides a waterproof and dustproof structure of photovoltaic mounting plate frame junction box, which comprises:

[0006] A box body is provided with an internal thread groove and an internal groove in communication with the internal thread groove;

[0007] A sealing ring is arranged in the internal groove;

[0008] A threaded sleeve is provided with a through hole, and the threaded sleeve is threadedly connected with the internal thread groove to generate an axial pressure on the sealing ring, so as to force the sealing ring to deform and press the cable;

[0009] A glue filling cavity is arranged in the box body for accommodating the potting glue, and the glue filling cavity is open on the side close to the sealing ring. The box body is provided with a glue injection hole in communication with the glue filling cavity. In use, the cable is sequentially inserted through the through hole, the sealing ring and the glue filling cavity, so that the sealing ring simultaneously presses the cable and the potting glue in the glue filling cavity after deformation.

[0010] As a preferred technical scheme of the utility model, the cross-sectional shape of the through hole matches that of the cable.

[0011] As the preferred technical scheme of the utility model, the box body is further provided with an exhaust hole connected with the glue filling cavity, which is used for exhausting air in the bubble when the sealant is pressed.

[0012] As the preferred technical scheme of the utility model, the waterproof and dustproof structure further comprises a pressing ring arranged between the threaded sleeve and the sealing ring.

[0013] As the preferred technical scheme of the utility model, the waterproof and dustproof structure further comprises:

[0014] The plug block is engaged with the insertion slot arranged in the box body, the upper end face of the plug block is attached to the lower end face of the insertion slot, the internal thread groove, the internal groove and the glue filling cavity are arranged between the upper end face and the lower end face, and the complete internal thread groove, internal groove and glue filling cavity can be formed by mutually splicing the plug block and the insertion slot.

[0015] As the preferred technical scheme of the utility model, one end of the plug block is provided with a positioning pin, and the positioning pin is engaged with the positioning hole arranged in the box body.

[0016] As the preferred technical scheme of the utility model, each plug block is provided with at least two positioning pins.

[0017] As the preferred technical scheme of the utility model, the outer end of the threaded sleeve is provided with a polygonal prism.

[0018] The utility model discloses a box body for cable, which comprises a box body, a sealing ring arranged in the box body, a threaded sleeve arranged in the box body and a cable arranged in the box body. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the utility model, and other drawings can be obtained according to these drawings without creative labor for the ordinary skilled in the art.

[0020] Figure 1 It is the external three-dimensional structure schematic diagram of the utility model;

[0021] Figure 2 It is the box body local section three-dimensional structure schematic diagram of the utility model;

[0022] Figure 3 For the utility model of the Figure 2 A place to enlarge the structure schematic diagram of the middle;

[0023] Figure 4 For the utility model of the plug-in block, sealing ring and pressure ring three-dimensional structure schematic diagram;

[0024] Figure 5 For the utility model of the box body bottom three-dimensional structure schematic diagram;

[0025] Figure 6 For the utility model of the box body upper end three-dimensional structure schematic diagram.

[0026] Marked as: 1, box body;2, cable;3, plug-in block;4, plug-in slot;5, positioning pin;6, positioning hole;7, internal thread groove;8, threaded sleeve;9, through hole;10, inner groove;11, sealing ring;12, pressure ring;13, glue cavity;14, glue injection hole;15, exhaust hole. Specific implementation

[0027] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the following is further detailed in combination with specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the utility model should be understood as the usual meaning by those skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] As Figure 1 , Figure 2 And Figure 3As shown in the figure, a waterproof and dustproof structure of a photovoltaic installation plate frame junction box comprises: a box body 1, the box body 1 is provided with an internal thread groove 7 and an internal groove 10 communicated with the internal thread groove 7; a sealing ring 11 arranged in the internal groove 10; a threaded sleeve 8 provided with a through hole 9, the through hole 9 is matched with the cross-sectional shape of the cable 2, the threaded sleeve 8 is screwed with the internal thread groove 7 to generate axial pressure on the sealing ring 11, so as to force the sealing ring 11 to deform and extrude the cable 2; a glue filling cavity 13 provided in the box body 1 for accommodating the filling glue, the glue filling cavity 13 is opened on the side close to the sealing ring 11, and the box body 1 is provided with a glue injection hole 14 communicated with the glue filling cavity 13; so that the sealing ring 11 is extruded on the cable 2 and the filling glue in the glue filling cavity 13 after deformation;

[0030] The above technical scheme can ensure that the gap between the sealing ring 11 and the cable 2 is filled with the filling glue. In use, the sealing ring 11 is put into the internal groove 10, then the threaded sleeve 8 is screwed into the internal thread groove 7, but not tightened, the cable 2 is sequentially inserted through the through hole 9, the sealing ring 11 and the glue filling cavity 13, then the filling glue is injected into the glue filling cavity 13 through the glue injection hole 14, and the threaded sleeve 8 is continued to be screwed to extrude the sealing ring 11 along the axial direction, so that the sealing ring 11 is deformed and fits with the cable 2. The sealing ring 11 is deformed and extruded on the glue filling cavity 13 at the same time, so that the air bubbles in the filling glue in the glue filling cavity 13 are pressed out, and the filling glue gradually penetrates into the gap between the sealing ring 11 and the cable 2, thereby sealing the gap. When the filling glue cools down, the cable 2 is fully sealed, the sealing ring 11 is combined with the filling glue, and the waterproof and dustproof effect of the junction box is improved.

[0031] As shown in the figures, Figure 3 and Figure 4 in this embodiment, the box body 1 is also provided with an exhaust hole 15 communicated with the glue filling cavity 13;

[0032] The above technical scheme can ensure that the air bubbles in the filling glue are discharged from the glue filling cavity 13 through the exhaust hole 15 when the filling glue is pressed.

[0033] As shown in the figures, Figure 3 and Figure 4 in this embodiment, the waterproof and dustproof structure further comprises a pressing ring 12 arranged between the threaded sleeve 8 and the sealing ring 11;

[0034] The above technical scheme can ensure that the sealing ring 11 is not damaged. The pressing ring 12 can replace the threaded sleeve 8 to abut against the sealing ring 11, so as to prevent the threaded sleeve 8 from rotating and damaging the surface of the sealing ring 11.

[0035] As shown in the figures, Figure 4 , Figure 5 and Figure 6As shown, in this embodiment, the waterproof and dustproof structure further includes: a plug 3, which engages with a slot 4 opened in the box 1. The upper end face of the plug 3 and the lower end face of the slot 4 are in contact with each other. The internal thread groove 7, the inner groove 10 and the glue potting cavity 13 are all opened between the upper end face and the lower end face. By splicing the plug 3 and the slot 4 together, a complete internal thread groove 7, inner groove 10 and glue potting cavity 13 can be formed.

[0036] The above technical solution allows for easy removal of the aged potting compound and sealing ring 11. In use, the threaded sleeve 8 is rotated to dislodge it from the inner thread groove 7, thereby releasing the locking of the insert 3. The insert 3 can then be removed from the slot 4, allowing the molded potting compound to be removed from the potting cavity 13. Finally, the sealing ring 11 can be removed from the inner groove 10.

[0037] like Figure 5 As shown, in this embodiment, one end of the insert 3 is provided with a positioning pin 5, which engages with the positioning hole 6 opened in the box 1; preferably, each insert 3 is provided with at least two positioning pins 5.

[0038] The above technical solution can further improve the connection stability between the plug 3 and the slot 4.

[0039] like Figure 4 As shown, in this embodiment, the outer end of the threaded sleeve 8 is provided with a polygonal prism;

[0040] The above technical solution allows for easy rotation of the threaded sleeve 8 within the internal thread groove 7.

[0041] Working principle: Place the sealing ring 11 into the inner groove 10, then place the pressure ring 12 at the end of the sealing ring 11 away from the potting cavity 13. Then screw the threaded sleeve 8 into the inner thread groove 7, but do not tighten it. Pass the cable 2 through the through hole 9, the sealing ring 11, and the potting cavity 13 in sequence. Then inject potting compound into the potting cavity 13 through the injection hole 14. Continue to screw the threaded sleeve 8 so that one end of it presses the pressure ring 12 axially. The pressure ring 12 presses the sealing ring 11, thereby deforming the sealing ring 11. The sealing ring 11 is interference-fitted with the cable 2. While the sealing ring 11 is deformed, it also exerts a squeezing effect on the potting cavity 13, thereby expelling the air bubbles in the potting compound. The air bubbles are discharged from the potting cavity 13 through the vent 15. At the same time, the potting compound gradually seeps into the gap between the sealing ring 11 and the cable 2, thereby sealing the gap. When the potting compound cools down, it can fully seal the cable 2, achieving the combination of the sealing ring 11 and the potting compound, thereby improving the waterproof and dustproof effect of the junction box.

[0042] When it is necessary to remove the aged potting compound and sealing ring 11, the threaded sleeve 8 is dislodged from the inner thread groove 7 by rotating the polygonal prism at the outer end of the threaded sleeve 8, thereby releasing the locking of the insert 3, allowing the insert 3 to be removed from the slot 4, and allowing the molded potting compound to be removed from the potting cavity 13. Then, the sealing ring 11 is removed from the inner groove 10.

[0043] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0044] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A waterproof and dustproof structure of a junction box of a photovoltaic mounting plate frame, comprising: a box body (1) provided with an internal threaded groove (7) and an internal groove (10) communicating with the internal threaded groove (7); a sealing ring (11) arranged in the internal groove (10); a threaded sleeve (8) provided with a through hole (9), the threaded sleeve (8) being threadedly connected with the internal threaded groove (7) to generate axial pressure on the sealing ring (11), so as to force the sealing ring (11) to deform and extrude a cable (2); characterized in that the waterproof and dustproof structure further comprises: a glue filling cavity (13) provided in the box body (1) for accommodating a filling glue, the glue filling cavity (13) being open at a side close to the sealing ring (11), the box body (1) being provided with a glue injection hole (14) communicating with the glue filling cavity (13), in use, the cable (2) is sequentially arranged through the through hole (9), the sealing ring (11) and the glue filling cavity (13), so that the sealing ring (11) extrudes the cable (2) and the filling glue in the glue filling cavity (13) after deformation.

2. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 1, characterized in that, The through hole (9) is matched with the cross-sectional shape of the cable (2).

3. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 1, characterized in that, The box body (1) is further provided with an exhaust hole (15) communicating with the glue filling cavity (13), the exhaust hole (15) being used for exhausting air in bubbles when the filling glue is pressed.

4. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 1, characterized in that, The waterproof and dustproof structure further comprises a pressing ring (12) arranged between the threaded sleeve (8) and the sealing ring (11).

5. The waterproof and dustproof structure of the edge junction box of the photovoltaic mounting panel frame according to any one of claims 1-4, characterized in that, The waterproof and dustproof structure further comprises: an insertion block (3) engaged with an insertion groove (4) provided in the box body (1), an upper end surface of the insertion block (3) and a lower end surface of the insertion groove (4) being close to each other, the internal threaded groove (7), the internal groove (10) and the glue filling cavity (13) being provided between the upper end surface and the lower end surface, and the complete internal threaded groove (7), the internal groove (10) and the glue filling cavity (13) being formed by mutually splicing the insertion block (3) and the insertion groove (4).

6. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 5, characterized in that, One end of the insertion block (3) is provided with a positioning pin (5), the positioning pin (5) being engaged with a positioning hole (6) provided in the box body (1).

7. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 6, characterized in that, Each insertion block (3) is provided with at least two positioning pins (5).

8. The waterproof and dustproof structure of the photovoltaic mounting panel frame junction box according to claim 1, characterized in that, An outer end of the threaded sleeve (8) is provided with a polygonal prism.

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