A waterproof structure for a photovoltaic junction box

Abstract

The utility model relates to photovoltaic equipment technical field, concretely relates to a waterproof structure for photovoltaic junction box, is equipped with the port for cable to go in or go out through the side end intercommunication of junction box box body, the both ends symmetry of port are equipped with sealing rubber ring, the outer ring place recessed spring groove of sealing rubber ring, the lateral of sealing rubber ring is equipped with fixed inner ring in the port, annular groove is seted up on fixed inner ring, in initial state, the spring ring is wound along the outer ring of annular groove, after cable wiring is completed, the limit pin is pushed in through to the port, the inner end of limit pin pushes the spring ring, until the spring ring moves into the spring groove, to make the inner ring of sealing rubber ring abuts at cable, and becomes the state of sealed cable, relative to glue pouring seal, it is more convenient to use, and with long time sealed use, the spring ring further tightens sealing rubber ring inward, to make sealing rubber ring always keep the state of elastic sealing, and the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic equipment technology, and in particular to a waterproof structure for photovoltaic junction boxes. Background Technology

[0002] A photovoltaic (PV) junction box is a key component connecting solar PV modules to external wiring. Its core functions include current conduction and line protection. The specific structure includes a box body, base, cover, and conductive components inside the box. The conductive components are connected by cables that pass through or out of the box at the ports. Considering that PV junction boxes are used outdoors, their sealing and waterproofing performance requirements are high. Therefore, sealing components are usually installed at the ports. In existing technologies, sealing components often use materials such as sealing rings and silicone sealant to ensure waterproofing and dustproofing. However, when simply using sealing rings, the sealing ring needs to be tightly fitted onto the cable, making wiring difficult and inconvenient when the cable passes through or out of the box. Furthermore, traditional sealing rings suffer from seal aging after prolonged use, leading to the leakage of small amounts of moisture into the box. Using silicone sealant, on the other hand, presents problems such as cumbersome sealing and increased costs. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a waterproof structure for photovoltaic junction boxes to solve one or more of the problems mentioned above.

[0004] To achieve the above objectives, this utility model provides a waterproof structure for a photovoltaic junction box, which is disposed on the junction box body, and the side end of the junction box body is provided with a port for cables to pass through or exit:

[0005] The port is symmetrically equipped with sealing rubber rings at both ends. The sealing rubber rings are designed in annular shape with the inner circumference of the port as the center. In the initial state, there is a gap between the inner ring of the sealing rubber ring and the cable passing through the port.

[0006] A spring groove is recessed at the outer ring of the sealing rubber ring;

[0007] A fixed inner ring is provided inside the port next to the sealing rubber ring. An annular groove is provided on the fixed inner ring. In the initial state, a spring ring is wound around the outer ring of the annular groove.

[0008] A limiting pin is elastically connected to the side end of the port. By pushing the limiting pin toward the inside of the port, the inner end of the limiting pin pushes against the spring ring until the spring ring moves into the spring groove, so that the inner ring of the sealing rubber ring abuts against the cable and forms a sealed cable state.

[0009] Preferably, a rubber skeleton is provided at the center of the port. The rubber skeleton is designed in an annular shape coaxial with the inner circumference of the port. Sealing rubber rings at both ends are provided on the outer side of the rubber skeleton and are symmetrically arranged along both sides of the rubber skeleton.

[0010] Preferably, the cross-section of the rubber skeleton along its radial direction is designed in a T-shape.

[0011] Preferably, the fixing inner ring is connected to the outer end of the sealing rubber ring, and a sealed cavity is formed between the fixing inner ring, the sealing rubber ring and the inner wall of the port. The inner end of the limiting pin, the spring groove and the spring ring are all located inside the cavity.

[0012] Preferably, the cross-section of the fixed inner ring along its radial direction is designed in an L-shape.

[0013] Preferably, the inner end of the limiting pin inside the port is designed with an inclined end face to push against the spring ring, and a push plate is connected to the outer end of the limiting pin outside the port.

[0014] Preferably, the inner ring of the sealing rubber ring is coated with grease.

[0015] The beneficial effects of this utility model are as follows: A port for cables to pass through or exit is provided on the side of the junction box. A sealing rubber ring is symmetrically arranged at both ends of the port. A spring groove is recessed at the outer ring of the sealing rubber ring. A fixing inner ring is located beside the sealing rubber ring inside the port, and an annular groove is formed on the fixing inner ring. Initially, a spring ring is wound around the outer ring of the annular groove. After the cable connection is completed, a limiting pin is pushed towards the port. The inner end of the limiting pin pushes against the spring ring until the spring ring moves into the spring groove, so that the inner ring of the sealing rubber ring abuts against the cable, sealing the cable. Compared to glue sealing, this is more convenient to use and saves on glue costs. Furthermore, with prolonged use, even if the inner ring of the sealing rubber ring ages and wears, the spring ring will further tighten the sealing rubber ring inward, ensuring that the sealing rubber ring always maintains an elastic sealing state, resulting in a better sealing effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the junction box body of this utility model;

[0018] Figure 2 This is a top cross-sectional view of the port in the initial state of this utility model;

[0019] Figure 3 This is a top cross-sectional view of the sealing rubber ring of this utility model when it is in the state of sealing a cable.

[0020] The diagram is marked as follows:

[0021] 100. Junction box body; 101. Base; 200. Cable; 1. Port; 2. Sealing rubber ring; 21. Spring groove; 3. Gap; 4. Fixing inner ring; 41. Annular groove; 5. Spring ring; 6. Limit pin; 7. Rubber skeleton; 8. Cavity; 9. Push plate; 10. Lubricating grease. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] A waterproof structure for a photovoltaic junction box is provided on the junction box body 100. The side end of the junction box body 100 is connected to a port 1 for a cable 200 to pass through or exit. The two ends of the port 1 are symmetrically provided with sealing rubber rings 2. The sealing rubber rings 2 are designed to be annular and coaxial with the inner circumference of the port 1. In the initial state, there is a gap 3 between the inner ring of the sealing rubber ring 2 and the cable 200 passing through the port 1. The outer ring of the sealing rubber ring 2 is recessed with a spring groove 21. The port 1 is provided with a fixing inner ring 4 next to the sealing rubber ring 2. The fixing inner ring 4 has an annular groove 41. In the initial state, a spring ring 5 is wound around the outer ring of the annular groove 41. A limit pin 6 is elastically connected to the side end of the port 1. By pushing the limit pin 6 toward the port 1, the inner end of the limit pin 6 pushes against the spring ring 5 until the spring ring 5 moves into the spring groove 21, so that the inner ring of the sealing rubber ring 2 abuts against the cable 200 and seals the cable 200.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, this utility model is based on the existing conventional photovoltaic junction box structure principle, including a junction box body 100. The junction box body 100 has a hollow, flat box structure design. A base 101 is integrally connected to the bottom end of the junction box body 100. The junction box body 100 is used for installing conductive components such as metal terminals and diodes. The side end of the junction box body 100 is connected to a port 1 for cables 200 to pass through or exit. In particular, sealing rubber rings 2 are symmetrically provided at both ends inside the port 1. The sealing rubber rings 2 are made of conventional sealing rubber and other materials, and have a certain degree of elasticity. The sealing rubber rings 2 are designed in an annular shape coaxial with the inner circumference of the port 1. In the initial state, such as Figure 2 As shown, a gap 3 is left between the inner ring of the sealing rubber ring 2 and the cable 200 passing through the port 1, so that the cable 200 can freely pass through and connect during the installation of the photovoltaic junction box. A spring groove 21 is recessed at the outer ring of the sealing rubber ring 2. A fixing inner ring 4 is provided next to the sealing rubber ring 2 inside the port 1. The fixing inner ring 4 is also designed as an annular shape coaxial with the inner circumference of the port 1. An annular groove 41 is opened on the fixing inner ring 4. In the initial state, a spring is wound around the outer ring of the annular groove 41. Ring 5, spring ring 5 adopts the existing conventional circular spring ring structure. A limiting pin 6 is elastically connected to the side end of port 1. Specifically, an elastic component such as a spring connects the outer end of the limiting pin 6, which protrudes from port 1, to the outer wall of port 1, achieving an elastic connection of the limiting pin 6. This allows the limiting pin 6 to be pulled outwards. After the cable 200 is connected, the limiting pin 6 is pushed inwards towards port 1, i.e., the limiting pin 6 is pressed. The inner end of the limiting pin 6 pushes against the spring ring 5 until the spring ring 5 moves into the spring groove 21. Figure 3 As shown, the inner ring of the sealing rubber ring 2 is pressed against the cable 200 to seal the cable 200. Compared with glue sealing, it is more convenient to use and saves glue costs. Moreover, with long-term sealing use, even if there is aging and wear at the sealing point of the inner ring of the sealing rubber ring 2, the spring ring 5 will further tighten the sealing rubber ring 2 inward so that the sealing rubber ring 2 always maintains an elastic sealing state, resulting in a better sealing effect.

[0026] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, a rubber skeleton 7 is provided at the center of the port 1. The rubber skeleton 7 is designed in an annular shape with the inner circumference of the port 1 as the center. The sealing rubber rings 2 at both ends are wrapped around the outside of the rubber skeleton 7 and are symmetrically arranged along both sides of the rubber skeleton 7. The rubber skeleton 7 can be made of conventional metal material with good thermal conductivity. The outer ring of the rubber skeleton 7 is fixedly connected to the inner wall of the port 1 to form a stable rigid skeleton structure, so that the sealing rubber rings 2 at both ends are structurally stable and reasonable.

[0027] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the cross-section of the rubber skeleton 7 along its radial direction is designed in a T-shape.

[0028] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the fixed inner ring 4 is connected to the outer end of the sealing rubber ring 2. The fixed inner ring 4, the sealing rubber ring 2 and the inner wall of the port 1 form a sealed cavity 8. The inner end of the limiting pin 6, the spring groove 21 and the spring ring 5 are all located inside the cavity 8. Therefore, even if there is a gap at the connection of the limiting pin 6, it will only slightly affect the seal inside the cavity 8. However, the cavity 8 is not connected to the cable 200. Thus, the cable 200 that passes through the junction box 100 is tightly sealed by the sealing rubber ring 2 and will not be affected by the gap at the connection of the limiting pin 6. It is difficult for moisture from the external environment of the port 1 to enter the junction box 100 through the port 1.

[0029] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the fixed inner ring 4 has an L-shaped cross-section along its radial direction.

[0030] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the inner end of the limiting pin 6 that enters the port 1 is designed with an inclined end face to push against the spring ring 5. The outer end of the limiting pin 6 that exits the port 1 is connected to a push plate 9, which makes it convenient for the hand to press the push plate 9 and drive the limiting pin 6 to push the spring ring 5 inward.

[0031] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the inner ring of the sealing rubber ring 2 is coated with grease 10. The grease 10 can be any conventional sealing lubricant. The inner ring of the sealing rubber ring 2 does not fully contact the cable 200 for sealing; instead, a narrow strip on the inner ring of the sealing rubber ring 2 elastically abuts against the cable 200 for sealing. During sealing use, as... Figure 3 As shown, the grease 10 fills the gaps between the sealing surfaces, which can facilitate further lubrication and sealing, reduce wear, and improve temperature resistance.

[0032] 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 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.

Claims

1. A waterproof structure for a photovoltaic junction box, disposed on the junction box body (100), wherein the side end of the junction box body (100) is provided with a port (1) for a cable (200) to pass through or exit, characterized in that: The port (1) is symmetrically provided with sealing rubber rings (2) at both ends. The sealing rubber rings (2) are designed in an annular shape with the inner circumference of the port (1) as coaxial. In the initial state, there is a gap (3) between the inner ring of the sealing rubber ring (2) and the cable (200) passing through the port (1). The outer ring of the sealing rubber ring (2) is recessed with a spring groove (21); A fixed inner ring (4) is provided in the port (1) next to the sealing rubber ring (2). An annular groove (41) is provided on the fixed inner ring (4). In the initial state, a spring ring (5) is wound around the outer ring of the annular groove (41). A limiting pin (6) is elastically connected to the side end of the port (1). By pushing the limiting pin (6) toward the port (1), the inner end of the limiting pin (6) pushes against the spring ring (5) until the spring ring (5) moves into the spring groove (21), so that the inner ring of the sealing rubber ring (2) abuts against the cable (200) and forms a state of sealing the cable (200).

2. The waterproof structure for a photovoltaic junction box according to claim 1, characterized in that, A rubber skeleton (7) is provided at the center of the port (1). The rubber skeleton (7) is designed in an annular shape with the inner circumference of the port (1) as coaxial. The sealing rubber rings (2) at both ends are wrapped around the outside of the rubber skeleton (7) and are symmetrically arranged along both sides of the rubber skeleton (7).

3. A waterproof structure for a photovoltaic junction box according to claim 2, characterized in that, The rubber skeleton (7) has a T-shaped cross section along its radial direction.

4. A waterproof structure for a photovoltaic junction box according to claim 1, characterized in that, The fixed inner ring (4) is connected to the outer end of the sealing rubber ring (2). A sealed cavity (8) is formed between the fixed inner ring (4), the sealing rubber ring (2) and the inner wall of the port (1). The inner end of the limiting pin (6), the spring groove (21) and the spring ring (5) are all located inside the cavity (8).

5. A waterproof structure for a photovoltaic junction box according to claim 1, characterized in that, The fixed inner ring (4) has an L-shaped cross section along its radial direction.

6. A waterproof structure for a photovoltaic junction box according to claim 1, characterized in that, The inner end of the limiting pin (6) that enters the port (1) is designed with an inclined end face to push against the spring ring (5). The outer end of the limiting pin (6) that exits the port (1) is connected to a push plate (9).

7. A waterproof structure for a photovoltaic junction box according to claim 1, characterized in that, The inner ring of the sealing rubber ring (2) is coated with grease (10).

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