CN216216763U

CN216216763U - Direct current confluence device for photovoltaic string

Info

Publication number: CN216216763U
Application number: CN202122954936.6U
Authority: CN
Inventors: 郭浪
Original assignee: Calf Electric Suzhou Co ltd
Current assignee: Calf Electric Suzhou Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-04-05
Anticipated expiration: 2031-11-29

Abstract

The utility model provides a direct current confluence device for a photovoltaic string, which comprises an insulating shell, a bus fitting and a conductive bar, wherein the bus fitting is arranged on the insulating shell; the insulating housing wraps up in the outside of bus-bar fitting and busbar, and the bus-bar fitting is electrically conductive tubular structure, and two sections bus cable are connected respectively to the both ends of bus-bar fitting, and the busbar is installed on the bus-bar fitting, is equipped with the fixed orifices on the busbar, and the fixed orifices is used for the card to fix the branch line cable. The bus bar is internally and electrically connected, is externally insulated and plastically packaged, can directly lead direct current into the bus bar through the conductor, and has the advantages of convenient installation, small structure and good bus effect; in addition, the bus cable and the branch cable which are different in length are connected in a segmented mode, the branch cable is flexible in outgoing, 1-path to n-path branch cables can be converged according to needs, actual requirements can be better met, and the flexibility is high.

Description

Direct current confluence device for photovoltaic string

Technical Field

The utility model relates to the technical field of photovoltaics, in particular to a direct current confluence device for a photovoltaic string.

Background

In a photovoltaic power generation system, a plurality of photovoltaic modules are connected in series to form a circuit unit with a certain direct current output, which is called a module string or a group string for short. In the photovoltaic system, the direct current of the photovoltaic string needs to be converged and then connected into the back-end equipment, so that the problems that the string lines constructed by the traditional converging connection structure are too many and disordered are solved, the positive pole and the negative pole of each photovoltaic string can be connected with the converging branch lines, all the converging branch lines are connected to the converging bus bar, and finally the converging bus bar is directly connected to the back-end equipment. Adopt thin short cable as the branch road cable, one end is connected in the positive negative pole interface of photovoltaic group cluster, and the other end is connected on the busbar, and the busbar can adopt thick long cable. However, when the branch cables of the photovoltaic string are connected to the bus cable for converging, a special converging device is required for connecting and converging.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of connection and convergence of branch lines and bus lines in the process of converging photovoltaic strings in the prior art, and provides a direct current converging device for the photovoltaic strings.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a direct current confluence device for photovoltaic string comprises an insulating shell, a bus fitting and a conductive bar; the bus fitting is of a conductive tubular structure, two ends of the bus fitting are respectively connected with two sections of bus cables, the bus bar is installed on the bus fitting, and fixing holes are formed in the bus bar and used for clamping and fixing branch cables.

Preferably, the bus bar is detachably mounted on the bus bar fitting.

Preferably, the number of the fixing holes in the conductive bar is the same as the number of the positive interfaces or the negative interfaces of the photovoltaic string, each interface of the photovoltaic string is connected with one branch cable, and each branch cable is clamped and fixed in the fixing hole.

Preferably, the insulating housing comprises a bus protection shell and a branch protection shell which are integrally connected, the bus protection shell is wrapped outside the bus hardware fitting, and the branch protection shell is wrapped outside the conductive bar.

Preferably, the bus protection shell comprises a bus protection main shell and tightening ends located at two ends of the bus protection main shell, and the inner diameters of the two tightening ends are smaller than that of the bus protection main shell.

Preferably, the both ends of generating line gold utensil are equipped with the clamp respectively, the clamp compresses tightly and tightly hoops the skin of generating line cable, the clamp is located the inside of generating line protecting crust.

Preferably, the inner diameter of the band is smaller than the inner diameter of the tightening end, and the outer diameter of the band is larger than the inner diameter of the tightening end.

Preferably, a fastening socket is formed in the branch line protective shell, the fastening socket is located above the branch line cable, a fastening piece is installed in the fastening socket in a pluggable manner, and the fastening piece is perpendicular to the branch line cable and extrudes the branch line cable.

Preferably, the number of the fastening sockets is two and is respectively located at two sides of the conductive strip.

Compared with the prior art, the utility model has the beneficial effects that:

the bus bar is internally and electrically connected, is externally insulated and plastically packaged, can directly lead direct current into the bus bar through the conductor, and has the advantages of convenient installation, small structure and good bus effect; in addition, the two ends of the convergence device can be respectively detachably inserted and fixed with the bus cable and the branch cable, the bus cable and the branch cable with different lengths can be connected in a sectional mode according to the requirements of a photovoltaic system, the branch cable is flexible in outgoing line, the convergence device can converge 1-path to n-path (n is more than or equal to 2) branch cables according to the requirements, the actual requirements can be better met, and the flexibility is strong.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of an installation structure of a DC bus device for photovoltaic strings;

fig. 2 is a schematic diagram of an internal electrical connection structure of a dc bus device for photovoltaic strings.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 and fig. 2, a dc bus device for photovoltaic strings includes an insulating housing 1, a bus fitting 2, and a bus bar 3; insulating casing 1 parcel is in the outside of bus-bar fitting 2 and busbar 3, and bus-bar fitting 2 is electrically conductive tubular structure, and two sections bus cable 4 are connected respectively to bus-bar fitting 2's both ends, and busbar 3 is installed on bus-bar fitting 2, is equipped with fixed orifices 31 on the busbar 3, and fixed orifices 31 are used for the card to fix branch circuit cable 5.

When the photovoltaic power generation device is used, each photovoltaic string corresponds to two direct current converging devices, one direct current converging device is used for converging the positive current of the photovoltaic string, and the other direct current converging device is used for converging the negative current of the photovoltaic string. The plurality of direct current confluence devices are used for respectively converging the positive current and the negative current of the corresponding photovoltaic group strings on the positive bus cable 4 and the negative bus cable 4, and finally, the two bus cables 4 are directly connected into the rear-end equipment.

The bus section and the branch section with proper lengths are selected according to the installation site of the photovoltaic system, the two ends of the bus fitting 2 are respectively inserted into the end parts of two bus cables 4 to connect the two adjacent bus cables 4, and the bus sections are connected by a plurality of direct current confluence devices to form a long bus cable 4. The branch cable 5 is connected to the corresponding direct current bus device, so the length of the branch cable 5 is short, each photovoltaic group string has a plurality of positive interfaces and negative interfaces, each positive interface is inserted into the fixing hole 31 of the bus bar 3 of the corresponding bus device on the positive bus bar through the branch cable 5, and each negative interface is inserted into the fixing hole 31 of the bus bar 3 of the corresponding bus device on the negative bus bar through the branch cable 5. Therefore, the positive currents of all the photovoltaic string groups are finally converged into the positive bus cable 4 through the corresponding branch cables 5, the corresponding bus bars 3 and the corresponding bus fittings 2, and the negative currents of all the photovoltaic string groups are finally converged into the negative bus cable 4 through the corresponding branch cables 5, the corresponding bus bars 3 and the corresponding bus fittings 2.

The bus bar is internally and electrically connected, is externally insulated and plastically packaged, can directly lead direct current into the bus bar through the conductor, and has the advantages of convenient installation, small structure and good bus effect; in addition, the two ends of the convergence device can be respectively detachably inserted and fixed with the bus cable 4 and the branch cable 5, the bus cable 4 and the branch cable 5 with different lengths can be connected in a sectional mode according to the requirements of a photovoltaic system, the branch cable 5 is flexible in outgoing line, 1-path to n-path branch cables can be converged according to the requirements, the actual requirements can be better met, and the flexibility is strong.

In an embodiment, the bus bar 3 is detachably mounted on the bus bar fitting 2, the bus bar 3 may be bus bars 3 of different types and sizes, and the number of the fixing holes 31 formed in different bus bars 3 is different, and can be selected according to the number of the interfaces of the actual photovoltaic string. Preferably, the number of the fixing holes 31 on the conductive bar 3 is the same as the number of the positive interfaces or the negative interfaces of the photovoltaic string, each interface of the photovoltaic string is connected with one branch cable 5, and each branch cable 5 is clamped and fixed in the fixing hole 31. This structure makes branch road cable 5 be qualified for the next round of competitions in a flexible way, can select the busbar 3 that corresponds the specification according to the interface quantity of photovoltaic group cluster during the installation.

In an embodiment, the insulating housing 1 includes a bus bar protecting shell 11 and a branch line protecting shell 12 which are integrally connected, the bus bar protecting shell 11 is wrapped outside the bus bar hardware fitting 2, and the branch line protecting shell 12 is wrapped outside the conductive bar 3, so as to achieve a good insulating protection effect.

Preferably, the bus bar protection shell 11 includes a bus bar protection main shell 111 and two tightening ends 112 located at two ends of the bus bar protection main shell 111, and the inner diameter of the two tightening ends 112 is smaller than the inner diameter of the bus bar protection main shell 111. The two ends of the bus fitting 2 are respectively provided with a clamp 21, the clamp 21 compresses tightly and tightly clamps the outer layer of the bus cable 4, and the clamp 21 is positioned inside the bus protection shell 11. The inner diameter of the band 21 is smaller than the inner diameter of the tightening end 112 and the outer diameter of the band 21 is larger than the inner diameter of the tightening end 112. When the installation is completed and the electrical connection inside the bus bar device is stressed, the clamp 21 abuts against the inside of the tightening end 112, the force is transferred to the plastic package shell through the clamp 21, and the connection stability of the bus bar cable 4 of the bus bar device is enhanced.

Preferably, the branch line protecting shell 12 is provided with a fastening socket 121, the fastening socket 121 is located above the branch line cable 5, a fastening piece 122 is installed in the fastening socket 121 in a pluggable manner, and the fastening piece 122 is perpendicular to the branch line cable 5 and presses the branch line cable 5. The fastening tab 122 may be an elastic insulating sheet with a spring piece on the side, such as an elastic plastic sheet, so that the fastening tab 122 can be quickly fastened or pulled out from the fastening socket 121, and the leakage of electricity can be avoided. The fastening sockets 121 are two in number and are located on either side of the conductive strip 3. With this structure, the connection of the branch cables 5 is more rapid and convenient, and the branch cables 5 positioned in the bus bars 3 can be further locked by inserting the fastening pieces 122, enhancing the connection stability of the branch cables 5 of the bus device of the present invention.

In summary, the direct current bus device of the present invention is externally sealed by an insulating plastic package, and is electrically connected inside the direct current bus device, the branch cable connected to the photovoltaic string is connected and fixed to the conductive strip, the conductive strip and the bus fitting are connected and electrically conducted with each other, and the bus cable is fixed in the bus fitting, so that the positive current and the negative current of the photovoltaic string can be respectively converged to the positive bus and the negative bus. The branch cable on the bus bar is flexible in outgoing line and can be changed into 1 path or n paths (n is more than or equal to 2) as required, the internal electric connection is convenient to install, stable and reliable, the external insulating plastic package can provide good insulating protection, direct current can be directly led into the bus through the electric conductor, the installation is convenient, the structure is small and exquisite, and the bus-bar converging effect is good.

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the utility model. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims

1. The utility model provides a photovoltaic group is direct current device that converges for cluster which characterized in that: the bus bar comprises an insulating shell, a bus bar fitting and a bus bar; the bus fitting is of a conductive tubular structure, two ends of the bus fitting are respectively connected with two sections of bus cables, the bus bar is installed on the bus fitting, and fixing holes are formed in the bus bar and used for clamping and fixing branch cables.

2. The dc bus apparatus for photovoltaic string as set forth in claim 1, wherein: the bus bar is detachably mounted on the bus bar fitting.

3. The dc bus apparatus for photovoltaic string as set forth in claim 2, wherein: the number of the fixing holes in the conductive strips is the same as that of the positive electrode interfaces or the negative electrode interfaces of the photovoltaic string, each interface of the photovoltaic string is connected with one branch cable, and each branch cable is clamped and fixed in the fixing hole.

4. The dc bus apparatus for photovoltaic string as set forth in claim 1, wherein: the insulating shell comprises a bus protective shell and a branch protective shell which are integrally connected, the bus protective shell wraps the outside of the bus hardware fitting, and the branch protective shell wraps the outside of the conductive bar.

5. The dc bus apparatus for photovoltaic string as set forth in claim 4, wherein: the bus protection shell comprises a bus protection main shell and tightening ends located at two ends of the bus protection main shell, and the inner diameters of the two tightening ends are smaller than that of the bus protection main shell.

6. The dc bus apparatus for photovoltaic string as set forth in claim 5, wherein: the both ends of generating line gold utensil are equipped with the clamp respectively, the clamp compresses tightly and tightly hoops the skin of bus cable, the clamp is located the inside of generating line protecting crust.

7. The dc bus apparatus for photovoltaic string as set forth in claim 6, wherein: the inner diameter of the clamp is smaller than the inner diameter of the tightening end, and the outer diameter of the clamp is larger than the inner diameter of the tightening end.

8. The dc bus apparatus for photovoltaic string as set forth in claim 4, wherein: the branch line protective shell is provided with a fastening socket, the fastening socket is positioned above the branch line cable, a fastening piece is installed in the fastening socket in a pluggable mode, and the fastening piece is perpendicular to the branch line cable and extrudes the branch line cable.

9. The dc bus apparatus for photovoltaic string as set forth in claim 8, wherein: the number of the fastening sockets is two and the fastening sockets are respectively positioned on two sides of the conductive bar.