Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box which comprises a box body and a box cover, the box cover is connected with the box body in a matched mode, a containing cavity is formed in the box body, and the containing cavity is configured to contain an electrical module; a containing cavity is formed in the box body, a locking piece and a positioning column are arranged in the containing cavity, the locking piece comprises a fixed end and a free end, the fixed end is fixedly connected with the inner wall of the box body, one end of the free end is connected with the fixed end, and the free end is provided with a locking face extending in the center direction of the containing cavity; one end of the positioning column is fixedly connected with the inner wall of the box body, and the other end of the positioning column is provided with a supporting surface; the electrical module comprises a plate-shaped structure, and the plate-shaped structure is clamped between the locking face and the supporting face. According to the utility model, the installation efficiency of the electrical module in the photovoltaic junction box can be improved, and the production cost of products is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar photovoltaic technical field especially relates to a photovoltaic junction box. BACKGROUND

[0002] The photovoltaic junction box is a component specially designed for a solar photovoltaic power generation system, which plays a key role in connection and protection. The photovoltaic junction box is responsible for transmitting the electrical energy generated by the solar cell component to other parts in the system, such as an inverter or a battery, so as to ensure that the current can be effectively led out from the photovoltaic array and put into use.

[0003] The bypass protection module is usually fixed in the junction box. The basic design at the present stage is that a positioning column is arranged in the junction box body, a through hole is arranged at the corresponding position of the bypass protection module, four positioning columns are inserted into the through hole to complete the preliminary positioning, and then the shape of the positioning column above the upper surface of the electrical element is changed by cold pressing or hot melting to fix the electrical element, so that the bypass protection module can be fixedly connected with the box body.

[0004] The disclosure of the above background art content is only used to assist in understanding the concept and technical scheme of the utility model, which does not necessarily belong to the prior art of the present application, nor does it necessarily provide technical teaching. In the absence of explicit evidence that the above content has been disclosed before the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a photovoltaic junction box, which can improve the installation efficiency of the electrical module in the photovoltaic junction box and reduce the production cost of the product.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A photovoltaic junction box, characterized in that it comprises a box body and a box cover, the box cover is connected with the box body in cooperation, and the inside of the box body is provided with a containing cavity, the containing cavity is configured to contain an electrical module;

[0008] The containing cavity is provided with a locking piece and a positioning column, the locking piece comprises a fixed end and a free end, the fixed end is fixedly connected with the inner wall of the box body, one end of the free end is connected with the fixed end, and the free end is provided with a locking surface extending towards the center of the containing cavity;

[0009] One end of the positioning column is fixedly connected with the inner wall of the box body, and the other end of the positioning column is provided with a supporting surface;

[0010] The electrical module comprises a plate structure which is clamped between the locking surface and the supporting surface.

[0011] Further, according to any one of the above technical solutions or a combination of the above technical solutions, the free end of the locking member further comprises a guide surface which is inclined towards the bottom of the box body in a direction close to the center of the accommodating cavity; and / or,

[0012] The inside of the box body is provided with an annular partition plate which separates the accommodating cavity into a first accommodating cavity and a second accommodating cavity, the first accommodating cavity is arranged at the middle part of the box body, the second accommodating cavity is annularly arranged outside the first accommodating cavity, and the locking member and the positioning column are arranged inside the first accommodating cavity.

[0013] Further, according to any one of the above technical solutions or a combination of the above technical solutions, the supporting surface of the positioning column is provided with a positioning part which is a columnar structure.

[0014] The plate structure of the electrical module is provided with a through hole, and the positioning part passes through the through hole.

[0015] Further, according to any one of the above technical solutions or a combination of the above technical solutions, the height of the supporting surface relative to the bottom of the box body is lower than the height of the locking surface relative to the bottom of the box body.

[0016] The height of the positioning part relative to the bottom of the box body is higher than the height of the locking surface relative to the bottom of the box body.

[0017] Further, according to any one of the above technical solutions or a combination of the above technical solutions, the number of the locking members is multiple, and the multiple locking members are distributed and arranged in the accommodating cavity.

[0018] The number of the positioning columns is multiple, and the multiple positioning columns are distributed and arranged in the accommodating cavity.

[0019] Further, according to any one of the above technical solutions or a combination of the above technical solutions, the multiple locking members are symmetrically distributed on the front and back sides and / or the left and right sides of the box body.

[0020] The multiple positioning columns are symmetrically distributed on the front and back sides and / or the left and right sides of the box body.

[0021] Further, according to any one of the above technical solutions or a combination of the above technical solutions, a limiting plate is further arranged in the box body, one end of the limiting plate is fixedly connected with the inner wall of the box body, and the other end of the limiting plate extends to the middle part of the accommodating cavity.

[0022] The plate-shaped structure of the electrical module is provided with an open slot, and the limiting plate is clamped in the open slot.

[0023] Further, any one of the above technical solutions or a combination of the above technical solutions, the box body is provided with an extension part extending outward, the extension part is provided with a wire hole, the wire hole is configured to pass through the cable through the box body to be connected with the electrical module.

[0024] The extension part is arranged on one side or both sides of the box body.

[0025] Further, any one of the above technical solutions or a combination of the above technical solutions, the extension part is provided with an external thread on the outer side, one end of the extension part close to the box body is provided with a retreat stop structure, one end of the retreat stop structure is fixedly connected with the extension part, and the other end of the retreat stop structure extends outward.

[0026] Further, any one of the above technical solutions or a combination of the above technical solutions, the extension part is provided with an external thread on the outer side, one end of the extension part close to the box body is provided with a retreat stop structure, one end of the retreat stop structure is fixedly connected with the extension part, and the other end of the retreat stop structure extends outward.

[0027] Further, any one of the above technical solutions or a combination of the above technical solutions, the box body is further provided with a support column inside, one end of the support column is fixedly connected with the bottom of the box body, and the other end of the support column is abuttingly connected with the inside of the box cover.

[0028] The locking surface and the supporting surface are parallel.

[0029] The locking surface and the bottom surface of the box body are parallel.

[0030] The supporting surface and the bottom surface of the box body are parallel.

[0031] Both ends of the box body are in arc shape, and the shape of the box cover matches the shape of the box body.

[0032] The technical scheme provided by the utility model has the beneficial effects as follows:

[0033] a. This utility model uses a locking element and a positioning post inside the receiving cavity of the junction box to lock the electrical module by using the supporting surface at the upper end of the positioning post and the locking surface at the lower end of the locking element. This replaces the complex process in the prior art of setting multiple positioning posts inside the box, setting corresponding holes on the circuit board of the electrical module, inserting the positioning posts into the holes, and then using laser welding to melt and solidify the positioning posts above the upper surface of the circuit board to fix the circuit board. This effectively simplifies the manufacturing process of photovoltaic junction boxes, improves production efficiency, and reduces costs.

[0034] b. This utility model provides a support column inside the box body. One end of the support column is fixedly connected to the bottom of the box body, and the other end of the support column is in contact with the inside of the box lid. This can support the box lid and also serve as a reference when filling the box body with sealant, avoiding too much or too little sealant.

[0035] c. This utility model locks the cable by threading the thread on the outside of the extension with the nut, and a backstop structure is provided on the extension. The backstop structure clamps the serrated structure on the nut to prevent the nut from loosening, ensuring that the cable is always locked and improving the reliability of the product's electrical and mechanical connections. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A perspective view of a first photovoltaic junction box provided as an exemplary embodiment of the present invention;

[0038] Figure 2 A top view schematic diagram of a first photovoltaic junction box provided as an exemplary embodiment of the present invention;

[0039] Figure 3 for Figure 2 A cross-sectional view shown in the AA direction;

[0040] Figure 4 A schematic diagram of the structure of the housing and electrical module in cooperation with an exemplary embodiment of the present invention;

[0041] Figure 5 A perspective view of a second photovoltaic junction box from a first angle, provided as an exemplary embodiment of the present invention;

[0042] Figure 6 A third angle of the second photovoltaic junction box is provided for an exemplary embodiment of the utility model.

[0043] Figure 7 A nut is provided for an exemplary embodiment of the utility model.

[0044] Among them, the reference signs include: 1-box body, 11-bottom wall, 12-side wall, 121-threading hole, 122-extension, 123-nut, 1231-sawtooth structure, 124-plug, 125-inner claw, 126-retention structure, 13-baffle, 2-box cover, 3-housing cavity, 31-locking piece, 311-fixed end, 312-free end, 313-locking surface, 314-guiding surface, 32-positioning column, 321-supporting surface, 322-positioning part, 33-supporting column, 34-limiting plate, 35-first housing cavity, 36-second housing cavity, 5-electrical module, 51-through hole, 52-opening slot, 6-cable. DETAILED DESCRIPTION

[0045] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0046] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, device, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0047] In an embodiment of the utility model, a photovoltaic junction box is provided, referring to Figures 1 to 6 , the photovoltaic junction box includes box body 1 and box cover 2, the box cover 2 is connected with the box body 1, and the inside of the box body 1 is provided with housing cavity 3, and the housing cavity is configured to accommodate electrical module 5;

[0048] The accommodating cavity 3 is provided with a locking piece 31 and a positioning column 32, the locking piece 31 comprises a fixed end 311 and a free end 312, the fixed end 311 is fixedly connected with the inner wall of the box body 1, one end of the free end 312 is connected with the fixed end 311, and the free end 312 is provided with a locking surface 313 extending to the center direction of the accommodating cavity 3;

[0049] One end of the positioning column 32 is fixedly connected with the inner wall of the box body 1, and the other end of the positioning column 32 is provided with a supporting surface 321;

[0050] The electrical module 5 comprises a plate-shaped structure which is clamped between the locking surface 313 and the supporting surface 321. The electrical module 5 is usually a circuit board provided / welded with electrical elements.

[0051] The utility model discloses a locking piece 31 and positioning column 32 are arranged in accommodating cavity 3, and the supporting surface 321 of the upper end of positioning column 32 and the locking surface 313 of the lower end of locking piece 31 realize the clamping mode and fix electrical module 5. Replace the prior art in the box body each corner setting positioning column, corresponding hole is set up on the circuit board of electrical module 5, the hole is inserted into the positioning column, and then the positioning column above the upper surface of the circuit board is melted and solidified through the mode of laser welding to fix the circuit board. Such a complex process can effectively simplify the preparation process of the photovoltaic junction box, improve the production efficiency and reduce the cost.

[0052] In an embodiment of the utility model, the box body 1 includes a bottom wall 11, a side wall 12 and a partition 13. Among them, the side wall 12 is surrounded around the bottom wall 11 and forms an accommodating cavity 3 with an opening, and the box cover 2 covers the opening and is connected with the side wall 12. Figures 1 to 4 As shown in the drawings, the two ends of the box body 1 are arc-shaped, and the middle part of the box body 1 is a rectangular structure. The shape of the box cover 2 matches the shape of the box body 1, and the box cover 2 is more reliable in connection with the box body 1. In other embodiments, the shape of the box body 1 can also be as shown in the drawings, which is a rectangular structure (top view section) with rounded corners / rectangular cuboid structure. The middle part can be outwardly expanded or not. Figures 5 to 6

[0053] In this embodiment, as shown in the drawings, the box body 1 is a rectangular structure with rounded corners, and the box cover 2 is a rectangular structure with rounded corners. Figure 3 And Figure 4 ​As shown, the partition plate 13 is annularly arranged inside the box body 1, and the partition plate 13 divides the accommodating cavity 3 into a first accommodating cavity 35 and a second accommodating cavity 36, wherein the first accommodating cavity 35 is arranged at the middle part of the box body 1, the second accommodating cavity 36 is annularly arranged outside the first accommodating cavity 35, and the locking member 31 and the positioning column 32 are arranged inside the first accommodating cavity 35. That is, the electrical module 5 is arranged in the first accommodating cavity 35, and the double-cavity structure can improve the sealing performance of the photovoltaic junction box.

[0054] In the embodiment, a plurality of locking members 31 and positioning columns 32 are arranged in the first accommodating cavity 35, and the plurality of locking members 31 are symmetrically arranged on the front and rear sides and / or the left and right sides of the box body 1; and the plurality of positioning columns 32 are symmetrically arranged on the front and rear sides and / or the left and right sides of the box body 1. Preferably, the locking member 31 and the positioning column 32 are both upwardly extended from the bottom of the box body 1, and the locking surface 313 and the supporting surface 321 are both parallel to the bottom surface of the box body 1. Moreover, the height of the supporting surface 321 relative to the bottom of the box body 1 is lower than the height of the locking surface 313 relative to the bottom of the box body 1; and the height of the positioning portion 322 relative to the bottom of the box body 1 is higher than the height of the locking surface 313 relative to the bottom of the box body 1. The distance between the locking surface 313 and the supporting surface 321 is equivalent to the thickness of the plate-shaped structure of the electrical module 5.

[0055] The locking member 31 is in an elastic structure, and the free end 312 of the locking member 31 further comprises a guide surface 314, which is inclined to the bottom of the box body 1 in a direction close to the center of the accommodating cavity 3, that is, the distance between the guide surfaces 314 of the two oppositely arranged locking members 31 in the front-rear direction / first direction (the arrow direction of the upper left side) of the box body gradually decreases in the second direction (the direction from top to bottom of the box body, Figure 3 the arrow direction of the upper right side). Figure 3 Moreover, the minimum distance between the guide surfaces 314 of the two oppositely arranged locking members 31 is less than the width of the plate-shaped structure of the electrical module 5.

[0056] The support surface 321 of the positioning column 32 is provided with a positioning part 322 in the form of a columnar structure. The plate-shaped structure of the electrical module 5 is provided with a through hole 51, and the positioning part 322 passes through the through hole 51. The shape of the through hole 51 matches the cross section of the columnar structure. Preferably, the positioning part 322 is in the form of a cylinder, and the through hole 51 is a circular hole, the diameter of the through hole 51 being slightly larger than the cross-sectional diameter of the positioning part 322, and the cross-sectional size of the positioning part 322 being smaller than the size of the support surface 321, that is, the through hole 51 of the electrical module 5 can pass through the positioning part 322 and be placed on the support surface 321.

[0057] More preferably, a limiting plate 34 is further arranged in the interior of the box body 1, one end of the limiting plate 34 being fixedly connected with the inner wall of the box body 1, specifically, the fixed end of the limiting plate 34 can be connected with the bottom wall of the box body 1 or the side wall of the box body 1, and the other end of the limiting plate 34 extends to the middle part of the accommodating cavity 3. The plate-shaped structure of the electrical module 5 is provided with an open slot 52, and the limiting plate 34 is clamped in the open slot 52.

[0058] During the installation of the electrical module 5, the through hole 51 of the electrical module 5 is aligned with the positioning part 322 of the positioning column 32, and the preliminary fixing is completed, at this time, the front and rear sides (the two sides in the first direction) of the electrical module abut against the guide surface 314 of the locking piece 31, the electrical module 5 is given a downward pressure, and moves along the guide surface to the direction of the bottom wall of the box body (the second direction), the free end 312 of the locking piece 31 moves to the direction of the side wall 12 under the action of the force, so that the electrical module 5 smoothly passes through the gap between the guide surfaces 314, until the lower surface of the electrical module 5 reaches the support surface 321 of the positioning column 32, and the locking surface 313 is located above the upper surface of the electrical module 5, preventing the electrical module 5 from moving upward. The electrical module 5 is located between the support surface 321 and the locking surface 313, and the locking installation of the electrical module 5 is completed.

[0059] Preferably, a support column 33 is further arranged in the interior of the box body 1, one end of the support column 33 being fixedly connected with the bottom of the box body 1, and the other end of the support column 33 being abuttingly connected with the interior of the box cover 2. The support column 33 abuts against the box cover 2, and plays a supporting role. At the same time, when the sealant is poured into the box body, the support column 33 can play a reference role, and the pouring height of the sealant can reach the height of the support column 33. Since part of the box cover extends into the accommodating cavity of the box body, if the support column is not provided, the pouring of the sealant is likely to be too much or too little. If the pouring of the sealant is too little, the reliability of the product is affected. If the pouring of the sealant is too much, the sealant will overflow the box body when the box cover is matched with the box body, not only wasting the sealant but also increasing the difficulty of subsequent sealant cleaning.

[0060] An extension 122 extending outwardly is arranged on the side wall of the box body 1, and a threading hole 121 is arranged on the extension 122, which is configured to pass the cable 6 through the box body 1 to be electrically connected with the electrical module 5. The extension 122 is arranged on one side or both sides of the box body 1, that is, the photovoltaic junction box can be connected with the cable on one side or both sides.

[0061] An outer thread is arranged on the outer side of the extension 122, and a retreat-stop structure 126 is arranged on the extension 122 close to one end of the box body 1 (usually arranged at the intersection of the extension 122 and the side wall 12), one end of the retreat-stop structure 126 is fixedly connected with the extension 122, and the other end of the retreat-stop structure 126 extends outwardly. Preferably, the retreat-stop structure 126 is in the form of a pawl structure, which has a certain gap with the outer side of the extension 122, and the extension direction of the pawl structure is the tightening direction of the thread, usually clockwise. The material of the retreat-stop structure 126 is a plastic with a certain elasticity.

[0062] A nut 123, a plug 124 and an inner claw 125 are arranged on the cable 6. The nut 123 is threadedly connected with the extension 122. A sawtooth structure 1231 is arranged on the nut 123 close to one end of the box body 1, the nut 123 is arranged on the cable 6, and the nut 123 is threadedly connected with the extension 122, and when the retreat-stop structure 126 and the sawtooth structure 1231 are located in the same cross section, that is, when the screw opening of the nut 123 touches the retreat-stop structure 126, a force in the tightening direction of the nut 123 is applied to the retreat-stop structure 126 (usually clockwise), and the retreat-stop structure 126 is bent under the action of the force and clamped into the sawtooth structure 1231. When the nut 123 is rotated in the opposite direction, that is, when the nut 123 is rotated in the direction of separating the nut 123 from the extension 122, the retreat-stop structure 126 abuts against the sawtooth structure 1231 and has a pressing force preventing the sawtooth structure 1231 from exiting, so that the nut 123 cannot be loosened.

[0063] The inner claw 125 and the plug 124 are arranged inside the extension 122, that is, inside the threading hole 121. The outer wall of the plug 124 is connected with the inner wall of the extension 122, and the inner wall of the plug 124 wraps the cable 6. The inner claw 125 is clamped between the plug 124 and the nut 123, and when the nut 123 is tightened, the connection between the inner claw 125 and the cable 6 becomes tighter and tighter until the nut 123 is rotated to the retreat-stop structure 126, the nut 123 is connected with the retreat-stop structure 126, and the fixation of the cable 6 with the box body 1 is completed.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A photovoltaic junction box, characterized by, The utility model relates to a box, including box body (1) and box cover (2), the box cover (2) with box body (1) cooperation connection, and the inside of box body (1) is provided with containing cavity (3), the containing cavity is configured as containing electrical module (5); The containing cavity (3) is provided with a locking piece (31) and a positioning column (32), the locking piece (31) includes a fixed end (311) and a free end (312), the fixed end (311) is fixedly connected with the inner wall of the box body (1), one end of the free end (312) is connected with the fixed end (311), and the free end (312) is provided with a locking surface (313) extending to the center direction of the containing cavity (3); One end of the positioning column (32) is fixedly connected with the inner wall of the box body (1), and the other end of the positioning column (32) is provided with a supporting surface (321); The electrical module (5) includes a plate structure, which is clamped between the locking surface (313) and the supporting surface (321).

2. The photovoltaic junction box of claim 1, wherein, The free end (312) of the locking piece (31) further includes a guide surface (314) inclined to the bottom of the box body (1) in the direction close to the center of the containing cavity (3); and / or, The inside of the box body (1) is provided with an annular partition plate (13), the partition plate (13) divides the containing cavity (3) into a first containing cavity (35) and a second containing cavity (36), the first containing cavity (35) is arranged at the middle part of the box body (1), the second containing cavity (36) is arranged outside the first containing cavity (35) in a ring shape, and the locking piece (31) and the positioning column (32) are arranged inside the first containing cavity (35).

3. The photovoltaic junction box of claim 1, wherein, The supporting surface (321) of the positioning column (32) is provided with a positioning part (322) in a columnar structure; The plate structure of the electrical module (5) is provided with a through hole (51), and the positioning part (322) passes through the through hole (51).

4. The photovoltaic junction box of claim 3, wherein, The height of the supporting surface (321) relative to the bottom of the box body (1) is lower than the height of the locking surface (313) relative to the bottom of the box body (1); The height of the positioning part (322) relative to the bottom of the box body (1) is higher than the height of the locking surface (313) relative to the bottom of the box body (1).

5. The photovoltaic junction box of claim 1, wherein, The number of the locking pieces (31) is multiple, and the multiple locking pieces (31) are distributed in the containing cavity (3); The number of the positioning columns (32) is multiple, and the multiple positioning columns (32) are distributed in the containing cavity (3).

6. The photovoltaic junction box of claim 5, wherein, The multiple locking pieces (31) are symmetrically distributed on the front and back sides and / or left and right sides of the box body (1); The multiple positioning columns (32) are symmetrically distributed on the front and back sides and / or left and right sides of the box body (1).

7. The photovoltaic junction box of claim 1, wherein, A limiting plate (34) is further arranged in the box body (1), one end of the limiting plate (34) is fixedly connected with the inner wall of the box body (1), and the other end of the limiting plate (34) extends to the middle part of the accommodating cavity (3); An open slot (52) is arranged on the plate-shaped structure of the electrical module (5), and the limiting plate (34) is clamped in the open slot (52).

8. The photovoltaic junction box of claim 1, wherein, An extension (122) extending outward is arranged on the box body (1), a wire hole (121) is arranged on the extension (122), and the wire hole (121) is configured to pass the cable (6) through the box body (1) to be connected with the electrical module (5); The extension (122) is arranged on one side or both sides of the box body (1).

9. The photovoltaic junction box of claim 8, wherein, An outer thread is arranged on the outer side of the extension (122), a retreat-stopping structure (126) is arranged on one end of the extension (122) close to the box body (1), one end of the retreat-stopping structure (126) is fixedly connected with the extension (122), and the other end of the retreat-stopping structure (126) extends outward; A nut (123) is further included, a sawtooth structure (1231) is arranged on one end of the nut (123) close to the box body (1), the nut (123) is sleeved on the cable (6), the nut (123) is threadedly connected with the extension (122), the retreat-stopping structure (126) is clamped with the sawtooth structure (1231), and when the nut (123) is screwed in a direction of separating the nut (123) from the extension (122), the retreat-stopping structure (126) has a pressing force on the sawtooth structure (1231) to prevent the sawtooth structure (1231) from exiting.

10. The photovoltaic junction box of claim 1, wherein, A supporting column (33) is further arranged in the box body (1), one end of the supporting column (33) is fixedly connected with the bottom of the box body (1), and the other end of the supporting column (33) is abuttingly connected with the inside of the box cover (2); and / or, The locking surface (313) and the supporting surface (321) are parallel; and / or, The locking surface (313) and the bottom surface of the box body (1) are parallel; and / or, The supporting surface (321) and the bottom surface of the box body (1) are parallel; and / or, Both ends of the box body (1) are in arc shape, and the shape of the box cover (2) matches the shape of the box body (1).

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