Junction box and power cabinet

Abstract

The junction box is used for the power cabinet with a three-phase wiring bar arranged on the outer wall and comprises a box body, an opening is formed in one side of the box body, the opening side of the box body is buckled to the outer wall face of one side of a box body of the power cabinet and is fixed to the box body of the power cabinet through a connecting piece, and the two sides of the box body comprise detachable side plates; the side, away from the box body, of the box body comprises a wiring board, and the wiring board is provided with a plurality of waterproof terminals for cables to penetrate into the box body. The junction box provided by the utility model can be fixed on the outer wall of one side of the box body of the power cabinet through the mounting bracket so as to enable an operator to stand for operation, and can realize quick disassembly of partial region of the box body through the detachable side plates on the two sides, so that enough operation space can be provided for a three-phase wiring bar in the box body; and the wiring difficulty and risk of the power cabinet are reduced.

Description

Technical Field

[0001] This application relates to the field of power electronic equipment technology, and in particular to a junction box and power cabinet. Background Technology

[0002] When installing and using a power cabinet, it is necessary to wire its three-phase circuit. Currently, most power cabinets adopt a top-entry and exit structure, which means that a box structure for wiring is installed on the top of the power cabinet. Operators need to climb to the top of the power cabinet to operate. Top operation poses certain safety risks to operators, and operators need to maintain their balance, making it difficult to operate the wiring terminals accurately.

[0003] Therefore, how to reduce the wiring difficulty and risks of power cabinets is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a junction box and power cabinet to reduce the wiring difficulty and wiring risk of the power cabinet.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A junction box for use in a power cabinet with a three-phase terminal block on its outer wall, comprising:

[0007] The box has an opening on one side, which is fastened to the outer wall of the power cabinet box and fixed to the power cabinet box by a connector. The two sides of the box include detachable side panels, and the side of the box away from the box includes a terminal block. The terminal block is provided with multiple waterproof terminals for cables to pass through into the box.

[0008] Preferably, in the junction box described above, the connector is a mounting bracket, the mounting bracket is fixed to the side wall of the enclosure, and the side plate is assembled on the mounting bracket and perpendicular to the side wall of the enclosure.

[0009] Preferably, in the junction box described above, the mounting bracket includes a first bracket that fits against the side wall of the enclosure and a second bracket that extends out from the side wall of the enclosure. The side plate is mounted on the first bracket and supported by the second bracket.

[0010] Preferably, in the junction box described above, the box body includes a top plate and a bottom plate arranged in a vertical direction, and ventilation holes are provided on both the top plate and the bottom plate.

[0011] Preferably, in the junction box described above, at least one of the bottom plate and the top plate is detachably mounted on the enclosure.

[0012] Preferably, in the junction box described above, a fan is provided with an opening on the top plate, and a fan guard is fixed on the side of the top plate facing away from the bottom plate. The air outlet direction of the fan is towards the ventilation hole on the bottom plate, and the projection of the fan guard on the top plate covers the fan.

[0013] Preferably, in the junction box described above, the fan's air outlet direction faces outwards from the box body, the ventilation hole on the base plate is the air inlet, and the fan is the air outlet; or...

[0014] The fan's airflow direction is towards the interior of the housing, the fan is the air intake end, and the ventilation hole on the bottom plate is the air outlet end.

[0015] Preferably, in the junction box described above, the three-phase terminal blocks include parallel A-phase terminal blocks, B-phase terminal blocks, and C-phase terminal blocks, and the spacing between adjacent terminal blocks is equal.

[0016] Preferably, in the junction box described above, the length extension direction of the A-phase terminal block, the B-phase terminal block, and the C-phase terminal block is the same as the airflow direction of the fan.

[0017] An electrical cabinet has a junction box as described in any of the above embodiments installed on its outer wall.

[0018] As can be seen from the above technical solution, the junction box provided in this application has an opening on one side and is fixed to the power cabinet box through connectors to form a cavity structure to protect the internal electrical components. At the same time, a terminal board is provided on one side of the box, and the terminal board is equipped with waterproof terminals for cables to pass through, so as to ensure the safety when making electrical connections to the three-phase terminal blocks inside the box. The two sides of the box also have detachable side panels. When the side panels are removed, the operator can easily pass the cables through the waterproof terminals on the terminal board and has sufficient operating space to perform wiring operations on the three-phase terminal blocks inside the box. The above structure allows the operator to operate inside the box in a standing position, reducing the difficulty and risk of wiring inside the junction box. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the power cabinet structure with junction box provided in this disclosure;

[0021] Figure 2 This is a schematic diagram of the junction box structure;

[0022] Figure 3 A structural diagram of the mounting bracket and three-phase terminal block;

[0023] Figure 4 This is a schematic diagram of the cable threading structure.

[0024] Among them, 10-box body; 110-top plate; 120-bottom plate; 1210-ventilation hole; 130-fan; 140-fan guard; 150-left side plate; 160-right side plate; 170-terminal block; 180-waterproof terminal; 20-mounting bracket; 210-first bracket; 220-second bracket; 30-three-phase terminal block; 310-A-phase terminal block; 320-B-phase terminal block; 330-C-phase terminal block; 40-box body; 50-cable. Detailed Implementation

[0025] The core of this application lies in disclosing a junction box and power cabinet to reduce the difficulty and risk of wiring in the power cabinet.

[0026] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0027] like Figure 1 and Figure 2 As shown, this disclosure provides a junction box for auxiliary wiring of a power cabinet. The junction box mainly includes a box body 10 with an opening on one side. The box body 10 is suitable for a power cabinet with a three-phase terminal block 30 on its outer wall. It fits against the outer wall of the cabinet 40 structure through its opening side and is fixed by a connector. The other side walls of the box body 10 cooperate with the cabinet 40 to form a relatively closed structure, so that the wiring area can be surrounded and protected when the three-phase terminal block 30 is electrically connected inside the box body 10.

[0028] It should be noted that, in order to meet the assembly and wiring requirements of the side-mounted junction box, the junction box 10 provided in this disclosure has detachable side plates on both sides. The side plates and connectors are detachably and independently assembled and connected, so that the side plates can be independently disassembled and installed before or after the installation of the junction box 10. This allows the junction box 10 to meet the individual disassembly and installation requirements of the two side plate areas. When performing wiring or maintenance operations inside the junction box 10, disassembling the corresponding side plate area can provide operating space, thus avoiding the problem of difficulty in effectively operating the internal wiring harness when the integrated structure is set.

[0029] Based on the above structure, such as Figure 1 and Figure 4 As shown, the box 10 also includes a junction box 170. The junction box 170 is a plate structure that is spaced apart from the enclosure 40 on the box 10. Preferably, the junction box 170 is arranged parallel to the side wall of the enclosure 40. The junction box 170 is also provided with a plurality of waterproof terminals 180. The cable 50 passes through the waterproof terminals 180 into the interior of the box 10 to provide waterproof protection for the contact end between the cable 50 and the box 10, thereby reducing the connection risk of the cable 50 when operating in rainy or humid environments.

[0030] It should be noted that the preferred arrangement direction of the waterproof terminals 180 is along the first direction, and the three-phase terminal block 30 specifically includes an A-phase terminal block 310, a B-phase terminal block 320, and a C-phase terminal block 330; and the waterproof terminals 180 are correspondingly arranged with the A-phase terminal block 310, the B-phase terminal block 320, and the C-phase terminal block 330 in a third direction, where the third direction is perpendicular to the terminal block 170, and the first direction and the second direction are perpendicular to each other. The corresponding arrangement of the waterproof terminals 180 with the A-phase terminal block 310, the B-phase terminal block 320, and the C-phase terminal block 330 in a third direction specifically means that the waterproof terminals 180 are divided into three groups. In the third direction, the projection of each group of terminal blocks on the terminal block 170 is within the projection range of one group of waterproof terminals 180, so that the cable 50 can reach the required terminal block position with the shortest distance after being vertically inserted from the waterproof terminal 180 position.

[0031] Based on the above embodiments, the connector can be a mounting bracket 20, which is fixedly mounted on the side wall of the enclosure 40 to provide a stable support foundation. The side plate is then assembled onto the mounting bracket 20 to achieve a stable connection. Simultaneously, the support of the mounting bracket 20 ensures that the side plate remains perpendicular to the side wall of the enclosure 40, giving the enclosure 10 a regular internal cavity structure, facilitating the installation of internal electrical components. Furthermore, in the junction box provided in this disclosure, to ensure that the plates in contact with the enclosure 10 and the power cabinet enclosure 40 can be independently assembled, the mounting bracket 20 specifically includes a first bracket 210 and a second bracket 220. Specifically, the first bracket 210 is fitted against the side wall of the enclosure 40 to achieve a fixed connection. It should be noted that the first bracket 210 can be a closed frame structure, such as a rectangular structure fixedly connected to the enclosure 40 to provide a stable connection foundation for the enclosure 10; alternatively, it can be a U-shaped open... In a specific embodiment of this disclosure, the top plate 110 of the box 10 has a relatively complex structure due to the design of the fan 130 and fan guard 140, and is unrelated to the wiring of the three-phase terminal block 30 inside the box 10. Therefore, the top plate 110 is independently and fixedly connected to the side wall of the box 40. It can be assembled first, or assembled after the other plates of the box 10 are installed. In this case, the first bracket 210 does not need to provide a supporting foundation for the top plate 110. Correspondingly, the first bracket 210 is a U-shaped bracket structure with the opening facing the top plate 110.

[0032] The first bracket 210 can be fixed to the housing 40 by welding, bolting, or screwing. The second bracket 220 is a support structure extending from the side wall. The second bracket 220 has at least two protruding legs. With the cooperation of the first bracket 210 and the second bracket 220, the left side plate 150, right side plate 160, and bottom plate 120 of the housing 10 are supported at least two edges, enabling stable independent assembly. To further improve the stability of the housing 10 on the mounting bracket 20, the second bracket 220 preferably has an L-shaped cross-section. The extended edges of the L-shaped structure support and protect the left side plate 150, right side plate 160, and bottom plate 120, thus improving connection stability. It should also be noted that after the individual panels of the housing 10 are assembled independently, the two panels at the joints are further fixed with screws to maintain the structural integrity of the housing 10.

[0033] Based on the above structure, such as Figure 1 and Figure 3As shown, the three-phase terminal block 30 is arranged along the first direction. It should be noted that the three-phase terminal block 30 consists of three spaced-apart sections. Its arrangement along a single direction not only enhances the structural regularity and aesthetics but also creates a more uniform heat dissipation area within the housing 10. This facilitates the design of air ducts for active or passive heat dissipation within the housing 10. Correspondingly, both the top plate 110 and bottom plate 120 of the housing 10 in the first direction have ventilation holes 1210 to allow airflow through the housing 10. The airflow flows in the first direction and aligns with the direction of the three-phase terminal block 30 to achieve effective heat dissipation. It should be noted that, to facilitate wiring operations on the three-phase terminal block 30, the first direction is preferably vertical. Furthermore, the top plate 110 and bottom plate 120 are preferably both perpendicular to the first direction, giving the housing 10 a horizontal top and bottom structure. At this point, the air duct inside the housing 10 is vertical. It should be noted that the top plate 110 and bottom plate 120, which are perpendicular to the first direction, improve the regularity of the housing 10. The three-phase terminal block 30 inside is also arranged along the first direction, allowing operators to easily perform wiring operations at the same height. However, in the above structure, the airflow through the vertical air duct inside the housing 10 is poor under natural conditions, resulting in low heat dissipation efficiency inside the housing 10. Therefore, to optimize the above technical solution, the top plate 110 of the housing 10 is also provided with mounting holes and a fan 130 is installed. The air outlet direction of the fan 130 is along the first direction, and in order to improve the airflow direction of the fan 130 to meet the heat dissipation requirements, the fan 130 can be an axial fan. Combined with the ventilation hole 1210 structure on the base plate 120, the airflow can flow in the first direction inside the box 10 under the drive of the fan 130; and since the three-phase terminal block 30 is set inside the box 10 along the first direction, that is, the length direction of the terminal block is along the first direction, the airflow direction is consistent with the direction of the three-phase terminal block 30. The airflow passing through the box 10 will not be blocked by the three-phase terminal block 30 and can pass through the three-phase terminal block 30 quickly, thereby satisfying the effective heat dissipation of the three-phase terminal block 30 and improving the heat dissipation efficiency of the junction box.

[0034] To further optimize the above technical solution, a fan guard 140 is also fixedly installed on the top plate 110. The fan guard 140 has a fine mesh structure and is located on the side of the top plate 110 facing away from the bottom plate 120. It provides ventilation without affecting the airflow drive of the fan 130, and at the same time, it can protect the fan 130. Specifically, the projection of the fan guard 140 on the top plate 110 covers the fan 130. The fan guard 140 can be a U-shaped or single-sided open box structure and is fastened to the top plate 110. Since the first direction is vertical, some dust and debris will accumulate at the top plate 110 of the box 10 under the action of gravity. In severe cases, it will invade the inside of the box 10 and affect the electrical connection between the three-phase terminal block 30 and the cable 50. Therefore, based on the side-mounted junction box, a fan guard 140 is set at the top plate 110 to improve the stability of the electrical connection inside the box 10.

[0035] Based on the above embodiments, there are two ways to set the fan 130 on the top plate 110, which only requires keeping the axial direction of the fan 130 along the first direction. Therefore, in some embodiments of this disclosure, the axial direction of the fan 130 is along the first direction, and its air outlet direction is towards the outside of the box 10. In this structure, the function of the fan 130 is to draw air from the inside of the box 10 to the outside. The ventilation hole 1210 on the bottom plate 120 is the air inlet. The airflow enters the box 10 from the bottom plate 120, passes through the three-phase terminal block 30 and the cable 50, and then exits from the fan 130 position on the top plate 110. That is, a direct current air duct from bottom to top is formed inside the box 10 to achieve heat dissipation inside the box 10.

[0036] Meanwhile, in some other embodiments of this disclosure, while the axial direction of the fan 130 is along the first direction, its air outlet direction is towards the interior of the housing 10, that is, the position of the top plate 110 of the housing 10, i.e., the fan 130 is the air inlet, and the ventilation hole 1210 on the bottom plate 120 is correspondingly set as the air outlet. The airflow enters the interior of the housing 10 from the position of the fan 130, passes through the three-phase terminal block 30 and the cable 50, and then exits from the bottom plate 120, thus forming a top-down DC air duct inside the housing 10 to dissipate heat from the components inside the housing 10.

[0037] Furthermore, in this disclosure, such as Figure 3As shown, the three-phase terminal block 30 is used to electrically connect the cable 50 and the electrical equipment inside the power cabinet. Specifically, it includes an A-phase terminal block 310, a B-phase terminal block 320, and a C-phase terminal block 330. To ensure uniform heat dissipation of the three-phase terminal block 30, it is preferable that the A-phase terminal block 310, B-phase terminal block 320, and C-phase terminal block 330 are arranged in parallel and at equal intervals in the second direction. This allows for closer contact area with the A-phase terminal block 310, B-phase terminal block 320, and C-phase terminal block 330 when airflow passes through the housing 10, thus improving the uniformity of heat dissipation. It should be noted that, as... Figure 1 As shown, the second direction is the direction that intersects with the first direction to satisfy the smooth flow of airflow inside the box 10, and preferably the second direction is set perpendicular to the first direction. That is, when the first direction is vertical, the A-phase terminal block 310, the B-phase terminal block 320 and the C-phase terminal block 330 can be arranged at intervals in the horizontal direction.

[0038] It should also be noted that, based on the above embodiments, the B-phase terminal block 320 is disposed between the A-phase terminal block 310 and the C-phase terminal block 330. The side panels of the housing 10 in the second direction include a left side panel 150 and a right side panel 160. Both the left side panel 150 and the right side panel 160 are plates that contact the housing 10 with the enclosure 40. In conjunction with the aforementioned embodiments, the first direction is vertical, and the second direction is horizontal. The housing 10 includes a top plate 110 and a bottom plate 120 in the vertical direction, and a left side panel 150 and a right side panel 160 in the horizontal direction. Preferably, the top plate 110, bottom plate 120, left side panel 150, and right side panel 160 are all rectangular plate structures so that when they are disposed perpendicular to the side wall of the enclosure 40, the housing 10 has a regular rectangular structure. Furthermore, the left side plate 150 and the right side plate 160 are independently assembled on the mounting bracket 20 and are both perpendicular to the second direction. When wiring the three-phase terminal block 30 inside the box 10, by disassembling the left side plate 150 and the right side plate 160, sufficient operating space is available to wire the A-phase terminal block 310 and C-phase terminal block 330 located on both sides in the second direction. At the same time, the bottom plate 120 is disassembled to wire the B-phase terminal block 320 from the bottom of the box 10. After completing all wiring of the A-phase terminal block 310, B-phase terminal block 320 and C-phase terminal block 330, the left side plate 150, the right side plate 160 and the bottom plate 120 are assembled. This allows operators to quickly wire the circuit and reduces the spatial constraints on wiring inside the box 10, especially the difficulty of operating the B-phase terminal block 320 located in the middle area.

[0039] Furthermore, this disclosure also provides a power cabinet, on the outer wall of the cabinet body 40 of which a junction box provided in any of the above embodiments is installed. It should be noted that since the junction box has the technical effects provided in any of the above embodiments, the power cabinet also has the above technical effects, which will not be repeated here.

[0040] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A junction box for use in a power cabinet with a three-phase terminal block (30) on its outer wall, characterized in that, The box (10) includes a box body (10) with an opening on one side, and the opening side is fastened to the outer wall of the power cabinet box (40) and fixed to the power cabinet box (40) by a connector. The two sides of the box body (10) include detachable side plates, and the side of the box body (10) away from the box (40) includes a terminal block (170). The terminal block (170) is provided with a plurality of waterproof terminals (180) for cables (50) to pass through into the box body (10).

2. The junction box as described in claim 1, characterized in that, The connector is a mounting bracket (20), which is fixed to the side wall of the housing (40). The side plate is mounted on the mounting bracket (20) and is perpendicular to the side wall of the housing (40).

3. The junction box as described in claim 2, characterized in that, The mounting bracket (20) includes a first bracket (210) that fits against the side wall of the box (40) and a second bracket (220) that extends out from the side wall of the box (40). The side plate is mounted on the first bracket (210) and supported by the second bracket (220).

4. The junction box as described in claim 1, characterized in that, The box body (10) includes a top plate (110) and a bottom plate (120) arranged in a vertical direction, and ventilation holes (1210) are provided on both the top plate (110) and the bottom plate (120).

5. The junction box as described in claim 4, characterized in that, At least one of the bottom plate (120) and the top plate (110) is detachably mounted on the housing (40).

6. The junction box as described in claim 4, characterized in that, The top plate (110) has an opening and a fan (130) is provided. A fan guard (140) is fixed on the side of the top plate (110) facing away from the bottom plate (120). The air outlet of the fan (130) is directed toward the ventilation hole (1210) on the bottom plate (120). The projection of the fan guard (140) on the top plate (110) covers the fan (130).

7. The junction box as described in claim 6, characterized in that, The fan (130) exhausts air towards the outside of the housing (10), the ventilation hole (1210) on the base plate (120) is the air inlet, and the fan (130) is the air outlet, or... The air outlet of the fan (130) is directed toward the interior of the box (10). The fan (130) is the air inlet, and the ventilation hole (1210) on the base plate (120) is the air outlet.

8. The junction box as described in claim 6, characterized in that, The three-phase terminal block (30) includes a parallel A-phase terminal block (310), a B-phase terminal block (320), and a C-phase terminal block (330), with equal spacing between adjacent terminal blocks.

9. The junction box as described in claim 8, characterized in that, The length extension direction of the A-phase terminal block (310), the B-phase terminal block (320) and the C-phase terminal block (330) is the same as the airflow direction of the fan (130).

10. A power distribution cabinet, characterized in that, The outer wall of the power cabinet is equipped with a junction box as described in any one of claims 1-9.

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