Conflux box protection structure of distributed photovoltaic power station

Abstract

The invention relates to the technical field of photovoltaic power generation, and discloses a combiner box protection structure of a distributed photovoltaic power station, the combiner box protection structure comprises a base and a switching mechanism, the top of the base is provided with a mounting chamber, the side end of the base is provided with a discharge port communicated with the mounting chamber, two vertical inner walls of the mounting chamber are embedded with contacts, and the contacts are connected with the switching mechanism. The interior of the installation chamber is provided with no less than five tubular fuse wires, and the two ends of the lowest tubular fuse wire are respectively in contact with the two contacts. A user can rapidly switch the tubular fuse wire between the two contacts by remotely controlling the electric switching assembly, so that the user does not need to arrive at the installation position of the fuse in time for manual replacement, and the power failure time of a distributed photovoltaic power station is effectively shortened. Therefore, the problems that the tubular fuse wire is difficult to replace and the power generation efficiency of the distributed photovoltaic power station is affected in the existing combiner box protection structure of the distributed photovoltaic power station are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic power generation, and particularly relates to a protection structure for a busbar box of a distributed photovoltaic power station. Background Art

[0002] A photovoltaic busbar box is a key device in a photovoltaic system for collecting, distributing, and protecting the electric energy generated by photovoltaic modules. In a distributed photovoltaic power station, a large number of photovoltaic panels are scattered, and the direct current generated by each of them needs to be connected to the busbar box through cables. Currently, a fuse is a common protection structure in a photovoltaic busbar box for preventing faults such as overcurrent and short circuit in the battery panel and the inverter. A common fuse consists of an installation base, two contacts, a tubular fuse wire, and other structures.

[0003] Currently, a Chinese patent discloses a convenient-to-install photovoltaic fuse (authorization publication number: CN215266176U). In this application, by setting a fixed base, a fuse wire, a connecting piece, a fixing frame, a fixing seat, a limiting seat, a limiting groove, a conductive sheet, a bolt, a fixing groove, a first magnet, a second magnet, a clamping groove, and a spring structure, when the fuse wire needs to be replaced, first pinch the fixing frame by hand to separate the fixing frame from the fixed base, then press the conductive sheet to separate the fuse wire from the conductive sheet, and then install the new fuse wire in the reverse steps. In this new type, the fuse wire is fixed by the fixing frame, and the fixing frame and the fixed base are fixed by the attraction between the first magnet and the second magnet, making the replacement of the fuse wire more rapid.

[0004] Although the above device can reduce the burden of the user in replacing the fuse wire, it still requires the user to arrive at the scene in time for replacement operations. Since distributed photovoltaic power stations are mostly set up in sparsely populated environments, in the face of some emergencies or when the installation position of the fuse wire is relatively concealed, it is difficult for the user to arrive in time for replacement, which will prolong the power outage time of the distributed photovoltaic power station and affect the power generation efficiency of the distributed photovoltaic power station. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the invention provides a protection structure for a busbar box of a distributed photovoltaic power station, which has the advantages of being able to remotely replace a tubular fuse wire and improving the conductivity between the tubular fuse wire and the contact, and solves the problems of difficult replacement of the tubular fuse wire in the existing protection structure of the busbar box of the distributed photovoltaic power station and affecting the power generation efficiency of the distributed photovoltaic power station.

[0007] (2) Technical Solutions

[0008] To achieve the above object of remotely replacing the tubular fuse wire and improving the conductivity between the tubular fuse wire and the contact, the invention provides the following technical solutions:

[0009] A combiner box protection structure of a distributed photovoltaic power station, comprising:

[0010] A base and a switching mechanism, wherein an installation chamber is provided on the top of the base, an outlet communicated with the installation chamber is provided on the side end of the base, contacts are embedded in the two vertical inner walls of the installation chamber, and no less than five tubular fuses are placed inside the installation chamber, and the two ends of the lowest tubular fuse are respectively in contact with the two contacts.

[0011] As a preferred solution of the junction box protection structure of a distributed photovoltaic power station described in the present invention: the switching mechanism includes a circular shaft rotatably connected to the inside of the installation chamber, the upper surface and the lower surface of the circular shaft are provided with switching grooves, the two adjacent tubular fuses are respectively arranged inside the two switching grooves, one end of the circular shaft is fixedly connected to an electric switching assembly, and both ends of the circular shaft are embedded and installed and rotatably connected with two friction rollers, and the friction rollers are staggered with the switching grooves.

[0012] Based on the above technical features: the switching mechanism has the advantages of being able to remotely replace the tubular fuse and improve the conductivity of the tubular fuse and the contact, which solves the problem of difficulty in replacing the tubular fuse in the junction box protection structure of the existing distributed photovoltaic power station, affecting the power generation efficiency of the distributed photovoltaic power station.

[0013] As a preferred solution of the junction box protection structure of a distributed photovoltaic power station described in the present invention: a placement room connected to the installation room is opened on the surface of the base, the electric switching assembly includes a wireless controller, a micro servo motor and a toothed belt, the wireless controller and the micro servo motor are both fixedly connected to the inside of the placement room, the end of the micro servo motor output shaft and one end of the circular shaft are fixedly connected with pulleys, and the two pulleys are connected by a toothed belt transmission.

[0014] Based on the above technical features: the user can remotely complete the operation of switching the tubular fuse through the electric switching component, making it easier for the user to use.

[0015] As a preferred solution of the junction box protection structure of a distributed photovoltaic power station described in the present invention: a transmission cavity is opened at the other end of the circular shaft, and the switching mechanism also includes a transmission assembly, and the transmission assembly includes a transmission shaft rotatably connected to the inside of the transmission cavity, one end of the transmission shaft passes through the transmission cavity and is fixedly connected to the installation chamber, and the surface of the transmission shaft is fixedly connected with a driving bevel gear, and the surface of the driving bevel gear is meshed with two driven bevel gears that are respectively fixedly connected to adjacent friction rollers.

[0016] Based on the above technical features: the transmission component can increase the rotation rate of the friction roller to improve the cleaning effect on the contacts.

[0017] As a preferred solution of the busbar box protection structure of a distributed photovoltaic power station according to the present invention: an annular groove communicating with the switching groove is formed on the surface of the circular shaft, and an inclined rod arranged inside the annular groove is fixedly connected to the inner top wall of the discharge port, and the axis line of the inclined rod intersects with the axis line of the circular shaft.

[0018] Based on the above technical features: This can actively guide the replaced tubular fuse out to ensure that the subsequent tubular fuse can be successfully positioned.

[0019] As a preferred solution of the busbar box protection structure of a distributed photovoltaic power station according to the present invention: a dust-proof cover is hinged to the side end of the base, one end of the dust-proof cover covers and seals the discharge port, and the dust-proof cover is larger than the vertical cross-sectional size of the discharge port.

[0020] Based on the above technical features: This can prevent external dust, water vapor and other impurities from entering the interior of the installation chamber through the discharge port to ensure the normal operation of the circular shaft, the contact and the tubular fuse.

[0021] As a preferred solution of the busbar box protection structure of a distributed photovoltaic power station according to the present invention: a elastic sheet is fixedly connected between the dust-proof cover and the base.

[0022] Based on the above technical features: This can increase the sealing effect of the dust-proof cover on the discharge port to improve the protection performance of the dust-proof cover.

[0023] As a preferred solution of the busbar box protection structure of a distributed photovoltaic power station according to the present invention: the switching mechanism further includes a guiding component, the guiding component includes a plugging cover inserted into the top of the installation chamber, a spring is fixedly connected to the inner top wall of the plugging cover, and the bottom of the spring contacts the uppermost tubular fuse.

[0024] Based on the above technical features: This can always apply a thrust force towards the switching groove to the tubular fuse. No matter which position the switching groove is in relative to the tubular fuse, the tubular fuse can be smoothly fed into the tubular fuse when it is successfully aligned with the switching groove to ensure that the tubular fuse can be normally replaced.

[0025] As a preferred solution of the busbar box protection structure of a distributed photovoltaic power station according to the present invention: the bottom of the spring is fixedly connected to a guiding plate slidably connected to the installation chamber, and an arc groove contacting the uppermost tubular fuse is formed at the bottom of the guiding plate.

[0026] Based on the above technical features: This can reduce the probability of the spring squeezing and damaging the tubular fuse to ensure the integrity of the tubular fuse.

[0027] As a preferred solution of the busbar box protection structure of the distributed photovoltaic power station described in the present invention: the number of the springs is not less than two, and the springs are uniformly fixedly connected between the plugging cover and the guiding plate.

[0028] Based on the above technical features: this can apply a more uniform extrusion force to the tubular fuse wire to ensure that the tubular fuse wire enters the switching slot straightly.

[0029] As a preferred solution of the busbar box protection structure of the distributed photovoltaic power station described in the present invention: an installation sleeve is fixedly connected to the side end of the plugging cover, and one end of the installation sleeve is inserted with a screw threadedly connected to the base.

[0030] Based on the above technical features: this can firmly lock the plugging cover on the top of the base to ensure that the spring can stably push against the tubular fuse wire.

[0031] (III) Beneficial effects

[0032] Compared with the prior art, the present invention provides a busbar box protection structure of a distributed photovoltaic power station, which has the following beneficial effects:

[0033] The user can remotely control the electric switching component to quickly switch the tubular fuse wire between the two contacts, which does not require the user to rush to the installation position of the fuse for manual replacement in time, effectively shortening the power outage time of the distributed photovoltaic power station, and thus solving the problem that the existing busbar box protection structure of the distributed photovoltaic power station has difficulties in replacing the tubular fuse wire, which affects the power generation efficiency of the distributed photovoltaic power station;

[0034] During the process of the round shaft switching the tubular fuse wire, the round shaft can drive the friction roller to rotate and friction the contact position between the contact and the tubular fuse wire, which can polish and remove the impurities generated by factors such as oxidation corrosion or arc erosion of the contact, increasing the effective contact area between the contact and the tubular fuse wire, and thus improving the conductivity of the current between the tubular fuse wire and the contact to ensure the safe operation of the entire busbar box circuit system;

[0035] And the elastic spring clip type is adopted to drive the tubular fuse wire, which can not only push the replaced tubular fuse wire to the outside of the base to ensure that the remaining intact tubular fuse wires can smoothly enter the switching slot, but also increase the number of tubular fuse wires that the fuse can accommodate, and thus extend the interval for the user to maintain the fuse. Description of the drawings

[0036] Figure 1 It is a schematic structural diagram of the overall structure in the present invention;

[0037] Figure 2 For Figure 1 The cross-sectional view in the A-A direction in

[0038] Figure 3 is Figure 1 a schematic cross-sectional view taken along line B-B in

[0039] Figure 4 is Figure 1 a schematic cross-sectional view taken along line C-C in

[0040] Figure 5 is Figure 4 an enlarged view at D in

[0041] Figure 6 is a schematic structural view of a part of the switching mechanism in the present invention;

[0042] Figure 7 is an exploded schematic view of the transmission assembly in the present invention;

[0043] Figure 8 is an exploded schematic view of the guiding assembly in the present invention.

[0044] In the figure: 100, base; 110, installation chamber; 120, discharge port; 130, placement chamber; 200, contact; 300, tubular fuse; 400, switching mechanism; 410, round shaft; 411, switching groove; 412, transmission cavity; 413, annular groove; 420, electric switching component; 421, wireless controller; 422, micro servo motor; 423, toothed belt; 424, belt pulley; 430, friction roller; 440, transmission assembly; 441, transmission shaft; 442, driving bevel gear; 443, driven bevel gear; 450, inclined rod; 460, dust cover; 470, elastic sheet; 480, guiding assembly; 481, plugging cover; 482, spring; 483, guiding plate; 4831, arc groove; 484, mounting sleeve; 485, screw. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Please refer to Figure 1 - Figure 8 , the present invention provides a technical solution:

[0047] A busbar protection structure for a distributed photovoltaic power station, comprising:

[0048] The base 100 and the switching mechanism 400, the top of the base 100 is provided with an installation chamber 110, the side end of the base 100 is provided with an outlet 120 connected with the installation chamber 110, the two vertical inner walls of the installation chamber 110 are embedded with contacts 200, and the installation chamber 110 is provided with at least five tubular fuses 300, and the two ends of the lowest tubular fuse 300 are respectively in contact with the two contacts 200;

[0049] When installing the fuse, the user first fits the base 100 with the installation position, and then fixes the base 100 at the corresponding position by bolts or clamping, and then inserts the corresponding wires in the junction box into the corresponding contacts 200, and then presses the wires and contacts 200 together by bolts or clamping, and the fuse can be used normally.

[0050] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the switching mechanism 400 includes a round shaft 410 rotatably connected to the inside of the installation chamber 110, and the upper surface and the lower surface of the round shaft 410 are both provided with switching grooves 411, and two adjacent tubular fuses 300 are respectively arranged inside the two switching grooves 411, and one end of the round shaft 410 is fixedly connected to an electric switching assembly 420, and two friction rollers 430 are embedded and rotatably connected at both ends of the round shaft 410, and the friction rollers 430 are staggered with the switching grooves 411;

[0051] During the process of the electric switching assembly 420 rotating the circular shaft 410, the circular shaft 410 drives the friction roller 430 to rotate. The friction roller 430 can rotate the friction contact 200 during the process of passing through the contact 200, which can grind away impurities generated by factors such as oxidation corrosion or arc erosion on the contact 200, thereby increasing the effective contact area between the contact 200 and the tubular fuse 300, thereby improving the conductivity of the current between the tubular fuse 300 and the contact 200, so as to ensure the safe operation of the entire junction box circuit system.

[0052] like Figure 3 , Figure 5 and Figure 6 As shown, the surface of the base 100 is provided with a placement chamber 130 connected to the installation chamber 110, and the electric switching assembly 420 includes a wireless controller 421, a micro servo motor 422 and a toothed belt 423, the wireless controller 421 and the micro servo motor 422 are both fixedly connected to the inside of the placement chamber 130, the end of the output shaft of the micro servo motor 422 and one end of the circular shaft 410 are both fixedly connected with a pulley 424, and the two pulleys 424 are connected through the toothed belt 423;

[0053] Before the electric switching component 420 is used, the wireless controller 421 needs to be matched and connected with an external remote terminal (the remote terminal here includes, but is not limited to, intelligent devices with wireless transmission functions such as mobile phones and Internet of Things controllers, and specific selection needs to be made according to actual requirements). When the user needs to remotely switch the tubular fuse 300, the user only needs to send an instruction to the wireless controller 421 through the remote terminal to control the micro servo motor 422 to rotate half a turn. The micro servo motor 422 drives the pulley 424 connected thereto to rotate 180 degrees. The pulley 424 drives another pulley 424 to rotate 180 degrees through the toothed belt 423, and the other pulley 424 drives the round shaft 410 to rotate 180 degrees, so that the round shaft 410 smoothly switches the tubular fuse 300 through the switching groove 411.

[0054] As Figure 3 、 Figure 4 、 Figure 5 and Figure 7 As shown in

[0055] During the rotation of the round shaft 410, the round shaft 410 drives the friction roller 430 to rotate synchronously. The friction roller 430 drives the driven bevel gear 443 to rotate along the driving bevel gear 442, so that the driven bevel gear 443 drives the friction roller 430 to rotate self - rotatively. This can increase the rotational friction rate of the friction roller 430 on the contact 200, and thus improve the cleaning effect on the impurities on the surface of the contact 200.

[0056] As Figure 3 、 Figure 4 and Figure 6 As shown in

[0057] When the switching slot 411 drives the tubular fuse 300 to be replaced past the inclined rod 450, the inclined rod 450 guides the tubular fuse 300 to the outside of the switching slot 411. The tubular fuse 300 sequentially passes through the discharge port 120 and pushes open the dust cover 460 to be discharged. This can automatically discharge the tubular fuse 300 to be replaced, enabling the switching slot 411 that returns to the upper position to effectively accommodate the intact tubular fuse 300, thereby extending the time interval for the user to maintain and add the tubular fuse 300.

[0058] As Figure 3 and Figure 8 shown, the switching mechanism 400 further includes a guiding component 480. The guiding component 480 includes a plugging cover 481 inserted into the top of the installation chamber 110. A spring 482 is fixedly connected to the inner top wall of the plugging cover 481. The bottom of the spring 482 contacts the uppermost tubular fuse 300. The bottom of the spring 482 is fixedly connected to a guiding plate 483 slidably connected to the installation chamber 110. An arc groove 4831 in contact with the uppermost tubular fuse 300 is formed at the bottom of the guiding plate 483. The number of springs 482 is not less than two, and the springs 482 are uniformly fixedly connected between the plugging cover 481 and the guiding plate 483. A mounting sleeve 484 is fixedly connected to the side end of the plugging cover 481, and a screw 485 threadedly connected to the base 100 is inserted into one end of the mounting sleeve 484.

[0059] When the user needs to add the tubular fuse 300 into the installation chamber 110, the user first unscrews the screw 485, then removes the plugging cover 481. At this time, the top opening of the installation chamber 110 is exposed. The user adds the corresponding number of tubular fuses 300 into the installation chamber 110, then re-covers the plugging cover 481, and finally passes the screw 485 through the mounting sleeve 484 and tightly threadedly connects it to the base 100.

[0060] When the tubular fuse 300 is stored inside the installation chamber 110, the spring 482 always applies a thrust towards the switching slot 411 to the tubular fuse 300 through the guiding plate 483 and the arc groove 4831. This can not only ensure that when the tubular fuse 300 is aligned with the switching slot 411 and the opening of the installation chamber 110 faces sideways or downward, the tubular fuse 300 can enter the switching slot 411 in time to ensure that the tubular fuse 300 can be normally replaced.

[0061] Working principle: When the user needs to remotely replace the tubular fuse 300, the user only needs to send a signal to the remote control electric switching component 420 to drive the circular shaft 410 to rotate. The circular shaft 410 simultaneously drives the two switching slots 411 to rotate 180 degrees. During this process, the tubular fuse 300 in the lower switching slot 411 is rotated away from the two contact heads 200. When the circular shaft 410 successfully rotates 180 degrees, the original upper switching slot 411 is rotated to the lower part, and the corresponding tubular fuse 300 is rotated and pressed between the two contact heads 200, so that the two contact heads 200 and the intact tubular fuse 300 re - establish a circuit. This does not require the user to come for replacement, so as to shorten the power outage time.

[0062] It should be noted that in the above description, the contact heads 200, the tubular fuse 300, the wireless controller 421, the micro - servo motor 422, the toothed belt 423, the belt pulley 424, the driving bevel gear 442 and the driven bevel gear 443 are all devices with relatively mature applications in the prior art. The specific models can be selected according to actual needs. At the same time, the power supply for the wireless controller 421 and the micro - servo motor 422 can be an internal power supply or a mains power supply. The specific power supply method is selected according to the situation and will not be elaborated here.

[0063] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0064] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combiner box protection structure for a distributed photovoltaic power station, characterized in that: include: A base (100), wherein a mounting chamber (110) is provided at the top of the base (100), a discharge port (120) communicating with the mounting chamber (110) is provided at the side end of the base (100), contacts (200) are embedded and installed on two vertical inner walls of the mounting chamber (110), and no less than five tubular fuses (300) are placed inside the mounting chamber (110), and two ends of the tubular fuse (300) at the bottom are in contact with two of the contacts (200) respectively; A switching mechanism (400) comprises a circular shaft (410) rotatably connected to the inside of an installation chamber (110), the upper surface and the lower surface of the circular shaft (410) are both provided with switching grooves (411), two adjacent tubular fuses (300) are respectively arranged inside the two switching grooves (411), one end of the circular shaft (410) is fixedly connected to an electric switching assembly (420), and two friction rollers (430) are embedded and rotatably connected at both ends of the circular shaft (410), and the friction rollers (430) are offset from the switching grooves (411).

2. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 1, characterized in that: The surface of the base (100) is provided with a placement chamber (130) which is in communication with the installation chamber (110); the electric switching assembly (420) comprises a wireless controller (421), a micro servo motor (422) and a toothed belt (423); the wireless controller (421) and the micro servo motor (422) are both fixedly connected to the interior of the placement chamber (130); the end of the output shaft of the micro servo motor (422) and one end of the circular shaft (410) are both fixedly connected with a pulley (424); and the two pulleys (424) are connected in transmission via a toothed belt (423).

3. The combiner box protection structure of a distributed photovoltaic power station according to claim 1, characterized in that: A transmission cavity (412) is formed at the other end of the circular shaft (410). The switching mechanism (400) further comprises a transmission assembly (440). The transmission assembly (440) comprises a transmission shaft (441) rotatably connected to the interior of the transmission cavity (412). One end of the transmission shaft (441) passes through the transmission cavity (412) and is fixedly connected to the installation chamber (110). The surface of the transmission shaft (441) is fixedly connected to a driving bevel gear (442). The surface of the driving bevel gear (442) is meshedly connected to two driven bevel gears (443) that are respectively fixedly connected to adjacent friction rollers (430).

4. The combiner box protection structure of a distributed photovoltaic power station according to claim 1, characterized in that: The surface of the circular shaft (410) is provided with an annular groove (413) connected to the switching groove (411); the inner top wall of the discharge port (120) is fixedly connected with an inclined rod (450) arranged inside the annular groove (413); the axis of the inclined rod (450) intersects with the axis of the circular shaft (410).

5. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 4, characterized in that: A dust cover (460) is hingedly connected to the side end of the base (100), one end of the dust cover (460) covers and blocks the discharge outlet (120), and the dust cover (460) is larger than the vertical cross-sectional dimension of the discharge outlet (120).

6. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 5, characterized in that: A spring sheet (470) is fixedly connected between the dust cover (460) and the base (100).

7. The combiner box protection structure of a distributed photovoltaic power station according to claim 1, characterized in that: The switching mechanism (400) further comprises a guiding assembly (480), wherein the guiding assembly (480) comprises a blocking cover (481) plugged into the top of the installation chamber (110), a spring (482) being fixedly connected to the inner top wall of the blocking cover (481), and the bottom of the spring (482) is in contact with the topmost tubular fuse (300).

8. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 7, characterized in that: The bottom of the spring (482) is fixedly connected to a guide plate (483) slidably connected to the installation chamber (110), and the bottom of the guide plate (483) is provided with an arc groove (4831) in contact with the topmost tubular fuse (300).

9. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 8, characterized in that: The number of the springs (482) is not less than two, and the springs (482) are evenly and fixedly connected between the blocking cover (481) and the guide plate (483).

10. A combiner box protection structure for a distributed photovoltaic power station as claimed in claim 9, characterized in that: A mounting sleeve (484) is fixedly connected to the side end of the blocking cover (481), and a screw (485) threadedly connected to the base (100) is inserted into one end of the mounting sleeve (484).

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