Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box, and relates to the technical field of photovoltaic equipment. According to the technical key points, the cable box comprises a box body, a box cover and a cable, an electric conductor and a diode are arranged in the box body, a limiting base is fixedly arranged at one end of the box body, and a wiring end of the cable penetrates through the limiting base, then is inserted into the box body and is communicated with the electric conductor in the box body through a mechanical clamping assembly; the mechanical clamping assembly comprises a main sleeve connected with the electric conductor; the main sleeve is sleeved with a fixing knob and is in threaded connection with the fixing knob, one end, close to the limiting base, of the main sleeve is connected with an external thread clamping opening, and a cable inserted into the main sleeve is clamped through the external thread clamping opening. Compared with the prior art, after the wiring end of the cable is inserted into the main sleeve in the box body, the wiring work of the cable in the junction box can be rapidly completed by screwing the fixed knob, and the operation is simple and convenient.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic equipment, and in particular to a photovoltaic junction box. Background Art

[0002] The main function of the photovoltaic junction box is to connect the solar cell circuit inside the module with the external circuit through the positive and negative cables of the junction box to transmit the electric energy. The junction box is glued to the back plate of the module through silicone. The junction box is equipped with a bypass diode to protect the battery string. The junction box is mainly composed of three parts: the junction box body, the cable and the connection terminal. The junction box body is generally composed of the following parts: base, conductive parts, diodes, sealing rings, sealing silicone, box cover, etc. The split junction box in the photovoltaic junction box contains multiple junction boxes, each of which has a diode, and the positive and negative cables are distributed on the two junction boxes, so a module must have at least two junction boxes.

[0003] When some existing photovoltaic junction boxes are in use, the cable terminals are inserted into the box body and connected to the conductive parts in the box body by welding. This requires workers to carry special welding equipment when connecting the cables to the junction box. However, the space in the box body is limited and the welding technology requirements for the workers are relatively high. This type of junction box is obviously inconvenient to use. Utility Model Content

[0004] The present application provides a photovoltaic junction box to solve the problems raised in the above background technology.

[0005] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0006] A photovoltaic junction box, comprising a box body, a box cover and a cable, wherein a conductor and a diode are arranged in the box body, a limit base is fixedly arranged at one end of the box body, and a wiring end of the cable passes through the limit base and is inserted into the box body, and is connected with the conductor in the box body through a mechanical clamping assembly;

[0007] A damping unit is provided in the limiting base, and the damping unit can limit the connection end of the cable to a certain position after the connection end of the cable is inserted into the box body;

[0008] The mechanical clamping assembly includes a main sleeve connected to the conductor, the main sleeve is arranged in the box body near one end of the limit base, the inner diameter of the main sleeve is not less than the outer diameter of the cable terminal; a fixing knob is sleeved on the main sleeve and the two are threadedly connected, and an externally threaded clamp is connected to one end of the main sleeve near the limit base, and when the fixing knob moves along the axial direction of the main sleeve on the externally threaded clamp toward the limit base, the cable inserted into the main sleeve can be clamped through the externally threaded clamp.

[0009] Furthermore, the external thread clamp is a trumpet-shaped structure that gradually expands outward from the main sleeve toward the limiting base, and the small-diameter end of the external thread clamp is fixedly connected to the main sleeve and the thickness of the two is equal;

[0010] The external thread clamp is evenly provided with a plurality of notches in the circumference thereof, and the plurality of notches can evenly divide the external thread clamp into a plurality of clips of equal shape, and the clips are elastic; the thickness of the clips gradually decreases from the limiting base to the main sleeve.

[0011] Furthermore, the inner side of the external thread clamp is provided with multiple circles of ridges.

[0012] Furthermore, the connection between the external thread clamp and the main sleeve is an arc-shaped structure, and the inner sides of the two ports of the fixing knob are chamfered.

[0013] Furthermore, a plurality of adjustment holes are evenly arranged around the circumference of the fixed knob.

[0014] Furthermore, the damping unit includes a support seat, which is fixedly mounted below one end of the limiting base away from the box body, and the upper end of the support seat is provided with an arc-shaped groove matching the outer contour of the cable, and elastic protrusions are symmetrically provided on the inner side wall of the arc-shaped groove.

[0015] Furthermore, an annular sealing ring is fixedly mounted on the box body at an inlet for passing the cable.

[0016] Furthermore, a conductive baffle is fixedly provided outside a port of the main sleeve away from one end of the limiting base, and an end of the conductive baffle is fixedly connected to the conductor.

[0017] Furthermore, the box cover is fixedly mounted on the box body by fastening bolts.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] When connecting the cable to the photovoltaic junction box of the present application, first pass the wiring end of the cable through the damping unit in the limit base and the side wall of one section of the box body in sequence, and then insert it into the main sleeve in the mechanical clamping assembly, and then turn the fixing knob on the main sleeve to make it gradually move along the thread on the main sleeve to the external thread clamp. As the fixing knob continues to move on the external thread clamp, the external thread clamp will gradually tighten until the wiring end of the cable is firmly clamped, and the wiring work between the cable and the photovoltaic junction box of the present application can be completed. Compared with the prior art, the present application does not require special tools for welding operations. After inserting the wiring end of the cable into the main sleeve in the box body, the wiring work of the cable in the junction box can be quickly completed by turning the fixing knob, and the operation is obviously simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application when the box cover is in an open state and the cable is just inserted into the main sleeve;

[0022] Figure 2 This is a schematic diagram of the structure before the cable is inserted into the box;

[0023] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 It is a schematic diagram of the overall structure after the damping unit of the present application is removed from the limiting base;

[0025] Figure 5 It is a schematic diagram of the overall structure after the annular sealing ring of the present application is removed from the reserved opening on the side of the box body close to the limiting base;

[0026] Figure 6 It is a schematic diagram of the overall structure after the cables of the present application are connected in the box body, and the box cover and the box body are installed by fastening bolts.

[0027] Figure numerals: 1. box body; 2. box cover; 3. cable; 4. conductor; 5. diode; 6. limit base; 7. mechanical clamping assembly; 71. main sleeve; 72. fixing knob; 73. external thread clamp; 8. damping unit; 81. support seat; 82. arc-shaped groove; 83. elastic protrusion; 9. notch; 10. clip; 11. convex ridge; 12. adjustment socket; 13. annular sealing ring; 14. conductive baffle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0029] like Figure 1-Figure 3 As shown, a photovoltaic junction box disclosed in the present application includes a box body 1, a box cover 2 and a cable 3. A conductor 4 and a diode 5 are arranged in the box body 1. A limit base 6 is fixedly arranged at one end of the box body 1. The wiring end of the cable 3 passes through the limit base 6 and is inserted into the box body 1, and is connected to the conductor 4 in the box body 1 through a mechanical clamping assembly 7; a damping unit 8 is arranged in the limit base 6, and the damping unit 8 can limit the wiring end of the cable 3 to a certain extent after it is inserted into the box body 1; the mechanical clamping assembly 7 includes and the conductive The main sleeve 71 is connected to the box body 4, and the main sleeve 71 is arranged at one end of the box body 1 close to the limiting base 6. The inner diameter of the main sleeve 71 is not less than the outer diameter of the wiring terminal of the cable 3; a fixing knob 72 is sleeved on the main sleeve 71 and the two are threadedly connected. An end of the main sleeve 71 close to the limiting base 6 is connected with an externally threaded clamp 73. When the fixing knob 72 moves toward the limiting base 6 on the externally threaded clamp 73 along the axial direction of the main sleeve 71, the cable 3 inserted into the main sleeve 71 can be clamped through the externally threaded clamp 73.

[0030] In the above embodiments, when the photovoltaic junction box of the prior art is used, the connection terminal of the positive or negative cable 3 is inserted into the special connection socket after passing through the installation hole reserved in advance at one end of the box body 1, and then the worker uses a special welding machine to weld the connection terminal of the cable 3 and the connection socket together. This connection method not only requires the worker to carry special welding equipment, but also has relatively high welding technology requirements for the worker due to the limited welding space, which makes the use of this junction box very inconvenient. In addition, the junction box is usually equipped with electrical components such as diodes 5. If the welding equipment contacts these electrical components during the welding process, irreversible damage will be caused to these electrical components.

[0031] When the photovoltaic junction box of the present application is in use, the worker sequentially passes the wiring terminal of the corresponding cable 3 through the limiting base 6 at one end of the box body 1, the side wall at one end of the box body 1 with a preset mounting hole, and the external threaded clamping opening 73 in the mechanical clamping assembly 7 until the wiring terminal of the cable 3 is inserted into the main sleeve 71. Then, the fixing knob 72 can be screwed along the main sleeve 71 toward the limiting base 6. Since the external threaded clamping opening 73 and the main sleeve 71 of the present application are both provided with external threads matching the internal thread specifications of the fixing knob 72, when screwing the fixing knob 72, the fixing knob 72 can be screwed into the fixing knob 72. The cam 73 is shaped like a screwdriver, and the cam 73 is screwed onto the locking cam 74. The cam 73 is rotatable around the locking cam 74 so that the locking cam 74 is in a state of being moved out of the way of the locking cam 74.

[0032] Compared with the prior art, when the junction box of the present application is connected to the terminal of the corresponding cable 3, it only needs to plug the terminal of the corresponding cable 3 into place and then turn the fixing knob 72 to complete the wiring work, which is simple and convenient to operate. Since the present application does not require special welding tools for welding operations, it also saves the trouble of carrying special welding equipment, and the problem that the welding equipment may damage the relevant electrical components in the box body 1 during the corresponding welding process is also effectively solved.

[0033] Furthermore, if Figure 2 and Figure 3 As shown, the external thread clamp 73 is a trumpet-shaped structure that gradually expands outward from the main sleeve 71 toward the limiting base 6. The small-diameter end of the external thread clamp 73 is fixedly connected to the main sleeve 71 and the thickness of the two is equal.

[0034] The external thread clamp 73 is evenly provided with a plurality of notches 9 in the circumference thereof, and the plurality of notches 9 can evenly divide the external thread clamp 73 into a plurality of clips 10 of equal shape, and the clips 10 are elastic; the thickness of the clips 10 gradually decreases from the limiting base 6 to the main sleeve 71 .

[0035] In the above embodiment, the external threaded clamp 73 of the present application is a trumpet-shaped structure that expands outward toward the limiting base 6, and the outer diameter of its small-diameter end is equal to the outer diameter of the main sleeve 71, and the thickness of the external threaded clamp 73 is equal to the thickness of the main sleeve 71, so that before the wiring terminal of the cable 3 is inserted into the main sleeve 71, the wiring terminal of the cable 3 can be quickly inserted into the external threaded clamp 73, and with the guidance of the inner wall of the external threaded clamp 73, the wiring terminal of the cable 3 can also be quickly positioned to the center of the main sleeve 71, so as to insert the wiring terminal of the cable 3 into the main sleeve 71. When the fixing knob 72 moves on the external threaded clamp 73, the multiple elastic clips 10 will gather due to the squeezing of the inner wall of the fixing screw. The multiple notches 9 provided on the external threaded clamp 73 of the present application are to prevent the multiple clips 10 from interfering with each other when gathering. The thickness of the clip 10 of the present application gradually decreases from the limiting base 6 to the main sleeve 71, so that when the position of the fixing knob 72 on the external threaded clamp 73 is closer to the limiting base 6, the multiple clips 10 on the external threaded clamp 73 will clamp the terminal of the cable 3 more tightly. In actual use, the worker can control the tightness of the cable 3 terminal by controlling the position of the fixing knob 72 on the external threaded clamp 73, which is very convenient to operate.

[0036] Furthermore, if Figure 2 and Figure 3 As shown, the inner side of the external thread clamp 73 is provided with a plurality of circles of ridges 11 .

[0037] In the above embodiments, the multiple circles of ridges 11 on the inner side of the external threaded clamp 73 of the present application can increase the gripping force on the terminal of the cable 3 when clamping the terminal of the cable 3, so that the cable 3 will not easily fall off from the box body 1 during use, thereby improving the fastening effect of the cable 3 in the junction box.

[0038] Furthermore, if Figure 2 and Figure 3 As shown, the connection between the external thread clamp 73 and the main sleeve 71 is an arc-shaped structure, and the inner sides of the two ports of the fixing knob 72 are both chamfered.

[0039] In the above embodiments, the connection between the external threaded clamp 73 and the main sleeve 71 of the present application and the inner sides of the two ports of the fixing knob 72 are arranged in accordance with the above, and the fixing knob 72 can be rotated from the main sleeve 71 to the external threaded clamp 73 to facilitate the transition of the fixing knob 72 from the main sleeve 71 to the external threaded clamp 73.

[0040] Furthermore, if Figure 2 and Figure 3 As shown, a plurality of adjustment holes 12 are evenly arranged around the circumference of the fixed knob 72 .

[0041] In the above embodiments, due to the limited space in the box body 1, it may be inconvenient for workers to simply tighten the fixing knob 72 by hand. Therefore, the present application provides a plurality of adjustment holes 12 evenly distributed around the circumference of the fixing knob 72. Workers can insert a small-diameter screwdriver, wire or a small-diameter hexagonal wrench into the adjustment hole 12 to assist in rotating the fixing knob 72, thereby improving the convenience of workers during operation.

[0042] Furthermore, if Figure 4 As shown, the damping unit 8 includes a support seat 81, which is fixedly mounted below the end of the limiting base 6 away from the box body 1. The upper end of the support seat 81 is provided with an arc-shaped groove 82 matching the outer contour of the cable 3, and elastic protrusions 83 are symmetrically provided on the inner side wall of the arc-shaped groove 82.

[0043] In the above embodiments, the support seat 81 of the present application is embedded below the end of the limiting base 6 away from the box body 1, and the arc-shaped groove 82 at the upper end of the support seat 81 and the limiting base 6 can jointly form a through hole that satisfies the passage of the cable 3. The material of the elastic protrusion 83 can be preferably rubber. When the terminal of the cable 3 passes through the arc-shaped groove 82 on the support seat 81, it will produce an extrusion force on the elastic protrusion 83 to deform it, and the force generated by the deformation of the elastic protrusion 83 will act on the cable 3, thereby limiting the cable 3 to a certain extent, so that before the terminal of the cable 3 is fixed, the cable 3 can be prevented from being offset. Anti-slip protrusions can also be added to the sides of the elastic protrusions 83 that are close to each other, so that the cable 3 can be further prevented from rotating in the junction box, thereby increasing the stability of the cable 3.

[0044] Furthermore, if Figure 5 As shown, an annular sealing ring 13 is fixedly mounted on the box body 1 at the entrance for passing the cable 3 .

[0045] In the above embodiments, since the photovoltaic junction box is usually used outdoors together with the photovoltaic module, if the outdoor dust enters the box body 1 from the inlet, it is easy to affect the circuits and electrical components inside the box body 1. The annular sealing ring provided at the inlet of the box body 1 for passing the cable 3 can achieve a good sealing effect on the gap around the cable 3 to prevent the internal environment of the box body 1 from being polluted by dust in the surrounding environment.

[0046] Furthermore, if Figure 1-Figure 3 As shown, a conductive baffle 14 is fixedly provided outside a port of the main sleeve 71 away from the limiting base 6 , and an end of the conductive baffle 14 is fixedly connected to the conductor 4 .

[0047] In the above embodiments, the conductive baffle 14 outside the port of the main sleeve 71 can, on the one hand, limit the wiring terminal of the cable 3 when the wiring terminal of the cable 3 is inserted into the main sleeve 71 to prevent the wiring terminal of the cable 3 from being inserted too deep. On the other hand, the conductive baffle 14 can be fixedly connected to the conductor 4 in the box body 1 to connect the cable 3 with the conductor 4.

[0048] Furthermore, if Figure 6 As shown, the box cover 2 is fixedly mounted on the box body 1 by fastening bolts.

[0049] In the above embodiments, the box cover 2 of the present application is connected to the box body 1 by fastening bolts, which makes it convenient for the staff to install and remove the box cover 2 on the box body 1 at any time according to needs.

[0050] The implementation principle of this embodiment is: when a worker needs to connect the cable 3 to the photovoltaic junction box of the present application, first pass the wiring end of the cable 3 through the damping unit 8 in the limit base 6, the side wall of one section of the box body 1 and the unconverged external threaded clamp 73 in turn, and finally insert it into the main sleeve 71 in the mechanical clamping assembly 7 until the wiring end of the cable 3 contacts the conductive baffle 14, and then turn the fixing knob 72 on the main sleeve 71 to gradually move it along the main sleeve 71 to the external threaded clamp 73. As the fixing knob 72 continues to move on the external threaded clamp 73, the multiple clips 10 on the external threaded clamp 73 will gradually tighten until the wiring end of the cable 3 is firmly clamped. At this point, the wiring work between the cable 3 and the photovoltaic junction box of the present application is completed. Next, buckle the box cover 2 and connect them by tightening the bolts. The present application does not require special tools for welding operations. After inserting the wiring end of the cable 3 into the main sleeve 71 in the box body 1, the wiring work of the cable 3 in the junction box can be quickly completed by screwing the fixing knob 72, which is obviously simpler and more convenient to operate.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A photovoltaic junction box, comprising a box body (1), a box cover (2) and a cable (3), wherein a conductor (4) and a diode (5) are arranged in the box body (1), characterized in that: A limiting base (6) is fixedly provided at one end of the box body (1); the connection end of the cable (3) passes through the limiting base (6) and is inserted into the box body (1), and is connected to the conductor (4) in the box body (1) through a mechanical clamping assembly (7); A damping unit (8) is provided in the limiting base (6), and the damping unit (8) can limit the connection end of the cable (3) to a certain position after the connection end is inserted into the box body (1); The mechanical clamping assembly (7) comprises a main sleeve (71) connected to the conductor (4); the main sleeve (71) is arranged in the box body (1) near one end of the limiting base (6); the inner diameter of the main sleeve (71) is not less than the outer diameter of the wiring terminal of the cable (3); a fixing knob (72) is sleeved on the main sleeve (71) and the two are threadedly connected; an end of the main sleeve (71) near the limiting base (6) is connected to an externally threaded clamp (73); when the fixing knob (72) moves along the axial direction of the main sleeve (71) on the externally threaded clamp (73) toward the limiting base (6), the cable (3) inserted into the main sleeve (71) can be clamped through the externally threaded clamp (73).

2. The photovoltaic junction box according to claim 1, characterized in that: The external thread clamp (73) is a trumpet-shaped structure that gradually expands outward from the main sleeve (71) toward the limiting base (6); the small-diameter end of the external thread clamp (73) is fixedly connected to the main sleeve (71) and the thickness of the two is equal; The external thread clamp (73) is evenly provided with a plurality of notches (9) in the circumferential direction. The plurality of notches (9) can evenly divide the external thread clamp (73) into a plurality of clips (10) of equal shape, and the clips (10) are elastic; the thickness of the clips (10) gradually decreases in the direction from the limiting base (6) to the main sleeve (71).

3. The photovoltaic junction box according to claim 2, characterized in that: The inner side of the external thread clamp (73) is provided with a plurality of circles of convex ridges (11).

4. The photovoltaic junction box according to claim 2, characterized in that: The connection between the external thread clamp (73) and the main sleeve (71) is an arc-shaped structure, and the inner sides of the two ports of the fixing knob (72) are both chamfered.

5. The photovoltaic junction box according to any one of claims 1 to 4, characterized in that: The fixed knob (72) is evenly provided with a plurality of adjustment sockets (12) around its circumference.

6. The photovoltaic junction box according to any one of claims 1 to 4, characterized in that: The damping unit (8) comprises a support seat (81), wherein the support seat (81) is fixedly mounted below one end of the limiting base (6) away from the box body (1), and an arc-shaped groove (82) matching the outer contour of the cable (3) is provided at the upper end of the support seat (81), and elastic protrusions (83) are symmetrically provided on the inner side wall of the arc-shaped groove (82).

7. The photovoltaic junction box according to any one of claims 1 to 4, characterized in that: An annular sealing ring (13) is fixedly mounted on the box body (1) at the entrance for the cable (3) to pass through.

8. The photovoltaic junction box according to claim 7, characterized in that: A conductive baffle (14) is fixedly provided outside a port of the main sleeve (71) at one end away from the limiting base (6), and an end of the conductive baffle (14) is fixedly connected to the conductor (4).

9. The photovoltaic junction box according to claim 1, characterized in that: The box cover (2) is fixedly mounted on the box body (1) by means of fastening bolts.

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