A terminal block with a wiring mode switching function and application thereof

Abstract

The application discloses a terminal box with a wiring mode switching function and application thereof, which comprises a terminal box shell, an insulating plate is arranged on one side in the terminal box shell, a plurality of winding cable outlets are formed in the insulating plate, a plurality of conductive copper bars are horizontally arranged at intervals along the width direction of the other side of the terminal box shell, a terminal is arranged on each of the conductive copper bars, and the ends of the plurality of conductive copper bars close to the insulating plate are aligned and are respectively provided with winding cable connecting points; wherein a plurality of stepped copper bar supports are arranged on the bottom plate of the terminal box shell, the conductive copper bars are fixed on the copper bar supports through insulators, and the wiring modes of the stator windings are changed by installing copper bar connecting plates with different structures between the plurality of conductive copper bars. The terminal box can realize the switching of the delta and Y wiring modes, change the voltage grade of the generator, and thus realize the compatibility of the generator to two voltage grades; meanwhile, the internal space of the terminal box is fully utilized under the premise of ensuring the discharge distance between the conductors, and compact design is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind power generators, and particularly relates to a terminal box with a wiring mode switching function and application thereof. BACKGROUND

[0002] In recent years, with the continuous promotion and deepening of the national energy-saving and emission-reducing policy, the new energy industry has entered a stage of rapid development, and the wind power generation technology has made breakthroughs, such as the rated power of wind power generators is getting larger and larger, and under the condition of constant voltage, the current is significantly increased. Thus, under the premise of ensuring safety, the diameter and quantity of cables must be increased, which not only increases the cost of the unit, but also increases the difficulty of the structural design of the unit.

[0003] At present, in order to solve the above problems, most wind power generator manufacturers adopt the countermeasure of increasing voltage to reduce current. The increase of voltage requires that the discharge gap and the creepage distance between motor components are also increased, and the volume of the motor terminal box is also necessarily increased. At the same time, it is necessary to prepare easy-to-damage and easy-to-consume parts for generators of different models, different voltage grades and different wiring modes (stators), and the workload is very large. In recent years, with the increase of the power of wind power generators and the increase of voltage, how to make the newly manufactured generators compatible with the voltage grades and wiring modes of the generators used in wind farms for several years or even decades, that is, to use the same terminal box, is a problem worth considering. However, the existing generator terminal box structure as shown in Figure 1 The wiring mode of the terminal box is usually determined at the initial design stage, and the user can only change one of the three-phase conductive rows, and the user cannot change the wiring mode of the generator. Such a generator cannot operate normally under other voltage grades, and therefore a terminal box capable of obtaining different voltage grades by changing the wiring mode is urgently needed.

[0004] Therefore, the present application provides a terminal box with a wiring mode switching function and application thereof to overcome the defects of the prior art. SUMMARY

[0005] The present application aims to overcome the above-mentioned defects of the prior art, and provides a terminal box with a wiring mode switching function and application thereof. The terminal box can change the wiring mode of the stator winding of the generator by installing copper row connecting plates with different structures between the conductive copper rows, realize the mutual conversion of the delta wiring mode and the Y wiring mode, and further change the voltage grade of the generator, so as to realize the compatibility of the generator to two voltage grades. At the same time, under the premise of ensuring the discharge distance between the conductors, the internal space of the terminal box is utilized as much as possible to realize compact design.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] A terminal box with wiring mode switching function, comprising a terminal box shell with a bottom plate, an insulating plate is fixedly arranged in one side of the terminal box shell, a plurality of winding cable outlets are formed on the insulating plate, a plurality of conductive copper bars with different lengths are horizontally arranged at intervals along the width direction of the other side of the terminal box shell, a plurality of terminal ends are uniformly arranged on the side of each conductive copper bar away from the insulating plate, and the ends of the plurality of conductive copper bars close to the insulating plate are aligned and respectively provided with winding cable connection points.

[0008] Among them, a plurality of copper bar supports are fixedly arranged on the bottom plate of the terminal box shell, the conductive copper bars are fixed on the copper bar supports through insulators, the wiring mode of the stator winding is changed by installing copper bar connecting plates with different structures between the plurality of conductive copper bars, and the voltage level is switched.

[0009] Further, the number of the conductive copper bars is six, and the six conductive copper bars are sequentially marked as ①-⑥ from top to bottom.

[0010] Further, the six conductive copper bars are divided into three groups, specifically, ①-② are a U-phase conductive bar group, ③-④ are a V-phase conductive bar group, and ⑤-⑥ are a W-phase conductive bar group, each group is composed of a first conductive copper bar and a second conductive copper bar arranged at intervals, and the length of the first conductive copper bar is greater than that of the second conductive copper bar.

[0011] The first conductive copper bar is composed of a top flush connecting segment A and a connecting segment B, the width of the connecting segment A is greater than that of the connecting segment B, the connecting segment B is arranged close to the insulating plate, and the second conductive copper bar is located on one side of the lower part of the connecting segment B.

[0012] Further, the copper bar supports are arranged in high, medium and low step forms in the height direction in the terminal box shell, and the three groups of conductive copper bars are respectively installed on the copper bar supports in high, medium and low step forms from top to bottom.

[0013] Further, the terminal ends on each conductive copper bar are uniformly arranged in a "W" shape, and the terminal ends are arranged at the connecting segment A, and the terminal box shell bottom side plate is provided with a "W" type cable joint matched with the terminal ends, for compressing the width direction size of the terminal box.

[0014] Further, the structure of the copper bar connecting plate is an "I" shape or a "J" shape.

[0015] Further, when the first voltage level needs to be adapted, the "I" shaped copper bar connecting plate is used to sequentially connect the ①-②, ③-④ and ⑤-⑥ conductive copper bars, forming a Δ wiring mode.

[0016] When the second voltage level is needed, the copper bar connecting plate in the shape of "J" is used to connect the conductive copper bars ②-④-⑥ in sequence, forming a Y connection mode.

[0017] The voltage of the first voltage level is greater than the voltage of the second voltage level.

[0018] Further, the junction box shell and the copper bar support are both made by bending and welding a steel plate.

[0019] Further, the junction box is further provided with a junction box cover which is detachably connected with the junction box shell.

[0020] Further, the junction box is used for a wind driven generator to realize the compatibility of the generator to two voltage levels.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The present application provides a junction box with a connection mode switching function, the number of conductive copper bars used by a user in the junction box is doubled (increased from 3 in the prior art to 6), and meanwhile a corresponding number of connection points are reserved on the stator winding inside the generator, so that the connection points are connected with the conductive copper bars in the junction box through connecting wires, and in addition, copper bar connecting plates with different structures are arranged, so that the user can replace the copper bar connecting plates between the conductive copper bars in the junction box, realize the mutual conversion of the delta connection mode and the Y connection mode, and thus realize the purpose of changing the connection mode and the voltage level of the generator, and finally realize the compatibility of the generator to two voltage levels; in addition, the present application is provided with "F" type copper bar supports with high, medium and low gradients in the junction box, and three groups of conductive copper bars are installed on the copper bar supports through insulators, and in particular, the "F" type copper bar supports and the "J" type copper bar connecting plates complement each other to form a rectangle, and in addition, wiring terminals arranged in the shape of "W" are arranged on the conductive copper bars, so that the space inside the junction box can be fully utilized, so that the junction box realizes compact design under the premise of stable work, and is convenient for installation and layout on the wind driven generator. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part of the specification, together with the specification, serve to explain the principles of the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a schematic view of the structure of the junction box of the existing generator;

[0026] Figure 2 is the main view structural schematic diagram of the junction box of the present application (delta connection mode);

[0027] Figure 3 is the side view structural schematic diagram of the junction box of the present application (delta connection mode);

[0028] Figure 4 is the bottom view structural schematic diagram of the junction box of the present application;

[0029] Figure 5 is the main view structural schematic diagram of the junction box of the present application (Y connection mode);

[0030] Figure 6 is the side view structural schematic diagram of the junction box of the present application (Y connection mode);

[0031] Wherein: 1 is the junction box shell; 2 is the insulating plate; 3 is the conductive copper bar; 4 is the terminal; 5 is the copper bar support; 6 is the insulator; 7 is the copper bar connecting plate; 8 is the junction box cover; 11 is the side plate; 21 is the winding cable outlet; 30 is the winding cable connecting point; 31 is the first conductive copper bar; 32 is the second conductive copper bar; 111 is the cable joint; 311 is the connecting section A; 312 is the connecting section B. DETAILED DESCRIPTION

[0032] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. In the following description, the same numbers refer to the same or similar elements throughout the drawings. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatuses consistent with some aspects of the present application as detailed in the appended claims.

[0033] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and examples.

[0034] Please refer to Figures 2 to 6As shown, the present application provides a terminal box with wiring mode switching function, comprising a terminal box shell 1 with a bottom plate, an insulating plate 2 is fixedly arranged on the right side of the bottom plate in the terminal box shell 1, a plurality of winding cable outlets 21 are formed on the insulating plate, a nylon sheath is sleeved on each winding cable outlet 21, and the nylon sheath plays an insulating protection and dustproof role on the winding cable; a plurality of conductive copper bars 3 with different lengths are arranged in the terminal box shell along the horizontal direction of the width at intervals, a plurality of terminal clamps 4 are uniformly arranged on each conductive copper bar 3 away from the side of the insulating plate 2, and the ends of the plurality of conductive copper bars 3 close to the insulating plate 2 are aligned and respectively provided with winding cable connection points 30, that is, the winding cable is introduced from one side of the terminal box, connected with the winding cable connection points 30 on the right end face of the conductive copper bar 3 after passing through the insulating plate 2.

[0035] Among them, a plurality of copper bar supports 5 are fixedly arranged on the bottom plate of the terminal box shell 1, the copper bar supports 5 and the conductive copper bars 3 form a longitudinal and transverse staggered distribution structure, the conductive copper bars 3 are fixed on the copper bar supports 5 through insulators 6, preferably, the conductive copper bars 3, the insulators 6 and the copper bar supports 5 are fixedly connected through bolts, the winding mode of the stator winding is changed by installing copper bar connecting plates 7 with different structures between the plurality of conductive copper bars 3, and the voltage grade is switched and changed.

[0036] Specifically, as shown in Figure 2 and 5 The number of the conductive copper bars 3 is six, the six conductive copper bars 3 are sequentially marked as ①-⑥ from top to bottom, and are divided into three groups according to the order, specifically, ①-② are U-phase conductive bar groups, ③-④ are V-phase conductive bar groups, and ⑤-⑥ are W-phase conductive bar groups, each group is composed of a first conductive copper bar 31 and a second conductive copper bar 32 arranged at intervals, and the length of the first conductive copper bar 31 is greater than that of the second conductive copper bar 32; wherein the first conductive copper bar 31 is integrally formed by a top flush connecting segment A-311 and a connecting segment B-312, the width of the connecting segment A-311 is greater than that of the connecting segment B-312, the connecting segment B-312 is arranged close to the insulating plate 2, and the terminal clamp 4 is arranged on the wider connecting segment A-311, the structure of the second conductive copper bar 32 is the same as that of the first conductive copper bar 31, and details are not repeated, and the second conductive copper bar 32 is arranged on the lower side of the connecting segment B-312 of the first conductive copper bar 31. That is, the structure of the first conductive copper bar 31 and the second conductive copper bar 32 is similar to a "L" type structure rotated 90 degrees clockwise, the second conductive copper bar 32 is arranged on the lower side of the gap (a gap generated by the different widths of the two connecting ends) on the right side of the first conductive copper bar 31, the left and right layouts of the conductive copper bars in each group share the width space electrical clearance, and the size of the terminal box in the width direction is compressed, so as to reduce the design size of the terminal box.

[0037] Preferably, the terminal 4 on each of the conductive copper bars 3 of the embodiment of the present application is arranged in a "W" shape, and the terminal 4 is arranged at the connecting section A-311, and the cable joint 111 matched with the terminal 4 is arranged in a "W" shape on the side plate 11 of the bottom of the terminal box shell 1, and the structure of the side plate 11 is as shown in Figure 4 The "W" shape arrangement further compresses the size of the terminal box in the width direction, and makes the space layout of the terminal box more compact.

[0038] As shown in Figure 3 、 6 The copper bar support 5 of the present application is arranged in a high, middle and low stepped manner in the height direction in the terminal box shell 1, that is, the copper bar support 5 is in an "F" shape from the side, and is divided into three layers, and three groups of conductive copper bars 3 are respectively installed on the upper, middle and lower three layers of the copper bar support 5 in sequence. Specifically, the U-phase conductive bar group composed of 1-2 is installed on the upper layer of the copper bar support 5, the V-phase conductive bar group composed of 3-4 is installed on the middle layer of the copper bar support 5, and the W-phase conductive bar group composed of 5-6 is installed on the lower layer of the copper bar support 5. This arrangement can make full use of the height space of the terminal box, and at the same time ensure the discharge distance between the conductors.

[0039] Preferably, in order to ensure the strength of the terminal box, the terminal box shell 1 and the copper bar support 5 are both made of steel plate by bending and welding.

[0040] It is worth noting that the structure of the copper bar connecting plate 7 of the embodiment of the present application is an "I" shape or a "J" shape. When a higher voltage grade needs to be adapted, the "I" shaped copper bar connecting plate 7 is used to sequentially connect the conductive copper bars 3 of 1-2, 3-4 and 5-6, forming a Δ connection mode. Specifically, according to the electric density of the copper bar connecting plate 7, six "I" shaped copper bar connecting plates are preferably used to connect the three groups of conductive bars, as shown in Figure 2 、 3 When a lower voltage grade needs to be adapted, four "J" shaped copper bar connecting plates 7 are used to sequentially connect the conductive copper bars 3 (the second conductive copper bar 32 in each conductive copper bar group) of 2-4-6, forming a Y connection mode, as shown in Figure 5 、 6 From the side view, the "F" shape of the copper bar support and the "J" shape of the copper bar connecting plate 7 complement each other to form a rectangle, effectively utilizing the space in the terminal box and minimizing the space occupation.

[0041] The junction box further comprises a junction box cover 8 which is detachably connected with the junction box shell 1. Preferably, one end of the junction box cover 8 is hingedly connected with the junction box shell 1 through a pin shaft, and the other end is connected with the junction box shell 1 through a lock catch. The junction box cover 8 has a sealing gasket attached to the inside thereof, so that the junction box cover 8 and the junction box shell 1 with the bottom plate form a closed cavity structure. In addition, a handle is mounted on the outer surface of the junction box cover 8, so as to facilitate opening of the junction box for maintenance of the internal components or changing of the wiring mode.

[0042] The junction box changes the wiring mode of the generator stator winding by installing different copper bar connecting plates 7 between the conductive copper bars 3, realizes mutual conversion of the Δ wiring mode and the Y wiring mode, changes the voltage level of the generator, and thus realizes compatibility of the generator to two voltage levels, and is thus particularly suitable for wind power generators.

[0043] The above description is merely one specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.

[0044] It should be understood that the present application is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A junction box with a wiring mode switching function, characterized in that, The junction box includes a junction box housing (1) with a base plate. An insulating plate (2) is fixedly installed on one side of the junction box housing (1). Several winding cable outlets (21) are opened on the insulating plate. On the other side of the junction box housing (1), multiple conductive copper busbars (3) of different lengths are arranged horizontally along its width direction. Each conductive copper busbar (3) has multiple terminals (4) evenly distributed on the side away from the insulating plate (2). The ends of the multiple conductive copper busbars (3) near the insulating plate (2) are aligned and the ends are respectively provided with winding cable connection points (30). Among them, a number of copper busbar brackets (5) are fixedly installed on the bottom plate of the junction box housing (1). The conductive copper busbar (3) is fixed on the copper busbar bracket (5) by an insulator (6). The connection method of the stator winding is changed by installing copper busbar connecting plates (7) with different structures between multiple conductive copper busbars (3) to switch voltage levels. The number of conductive copper busbars (3) is six, and the six conductive copper busbars (3) are marked as ① to ⑥ from top to bottom; the six conductive copper busbars (3) are divided into three groups, specifically ①-② are U-phase conductive busbar groups, ③-④ are V-phase conductive busbar groups, and ⑤-⑥ are W-phase conductive busbar groups. Each group consists of a first conductive copper busbar (31) and a second conductive copper busbar (32) arranged at intervals, and the length of the first conductive copper busbar (31) is greater than the length of the second conductive copper busbar (32). The first conductive copper busbar (31) consists of a connecting section A (311) and a connecting section B (312) with the top flush. The width of the connecting section A (311) is greater than the width of the connecting section B (312). The connecting section B (312) is located close to the insulating plate (2). The second conductive copper busbar (32) is located on the lower part of one side of the connecting section B (312).

2. A junction box with wiring mode switching function according to claim 1, characterized in that, The copper busbar bracket (5) is arranged in a high, medium and low step pattern along the height direction inside the junction box housing (1), and the three sets of conductive copper busbars (3) are respectively installed on the high, medium and low step copper busbar bracket (5) from top to bottom.

3. A junction box with wiring mode switching function according to claim 2, characterized in that, The terminals (4) on each of the conductive copper busbars (3) are evenly arranged in a "W" shape, and the terminals (4) are located at the connection section A (311). Correspondingly, the bottom side plate (11) of the junction box housing (1) is provided with a cable connector (111) arranged in a "W" shape that matches the terminals (4), which is used to compress the width dimension of the junction box.

4. A junction box with wiring mode switching function according to claim 3, characterized in that, The structure of the copper busbar connecting plate (7) is "I" shaped or "J" shaped.

5. A junction box with wiring mode switching function according to claim 4, characterized in that, When it is necessary to adapt to the first voltage level, use the "I"-shaped copper busbar connecting plate (7) to connect the conductive copper busbars (3) in sequence (1-2, 3-4, 5-6) to form a Δ connection method; When a second voltage level is required, use a "J"-shaped copper busbar connecting plate (7) to connect the conductive copper busbars ②-④-⑥ in sequence to form a Y-connection method; The voltage of the first voltage level is greater than the voltage of the second voltage level.

6. A junction box with wiring mode switching function according to claim 1, characterized in that, Both the junction box housing (1) and the copper busbar bracket (5) are made of steel plate by bending and welding.

7. A junction box with wiring mode switching function according to claim 1, characterized in that, The junction box is also provided with a junction box cover (8), which is detachably connected to the junction box housing (1).

8. The application of a junction box with wiring mode switching function according to any one of claims 1 to 7, characterized in that, The junction box is used for wind turbines to enable the generators to be compatible with two voltage levels.

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