Power equipment wiring structure and photovoltaic system

Abstract

The utility model relates to the technical field of power electronics, and discloses a power equipment wiring structure and a photovoltaic system. The power device wiring structure includes a power device housing, a junction box, an AC terminal, and a DC terminal. The junction box is arranged on one side of the power equipment shell and comprises a junction box shell and a junction box upper cover; a first mounting hole and a second mounting hole are formed in the bottom wall, facing the power equipment shell, of the junction box shell; the lower end of the junction box housing is provided with an installation channel used for installing a cable and / or an OT terminal. The AC terminal passes through the first mounting hole and is fixed on the power equipment shell; the DC terminal passes through the second mounting hole and is fixed to the power equipment housing. According to the utility model, the AC terminal and the DC terminal are installed at the same side and share one set of plastic shell mold, so that accidents caused by poor contact due to the fact that large current passes through the terminals are avoided; and meanwhile, the mold opening cost of a set of terminals is saved, the project development cost is saved, the product size is reduced, the installation time of the AC terminals and the DC terminals is saved, and the installation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a power equipment wiring structure and a photovoltaic system. Background Art

[0002] With the vigorous development of new energy sources such as solar energy, photovoltaic supporting energy storage has received attention, so energy storage converters have also developed rapidly.

[0003] Currently, in the field of energy storage converter technology, there are two methods for fixing high-power AC / DC terminals on the market:

[0004] One is to use a quick-plug terminal solution, which has the problem of poor contact causing the terminal to overheat and burn.

[0005] Another approach is to use through-the-wall terminals for the AC and DC terminals, each with two separate junction boxes for IP protection. This solution can prevent burnout caused by poor terminal contact, but using two waterproof junction boxes is expensive, requires running back and forth between the two sides of the machine, which is inconvenient for single-end wiring, and increases the overall size of the machine. Utility Model Content

[0006] In view of this, the present invention provides a power equipment wiring structure and a photovoltaic system to solve the problems of the current inverter's high-power AC / DC terminal fixing method, such as high junction box cost, inconvenience in wiring, and increased overall machine size.

[0007] In a first aspect, the present invention provides a power device wiring structure, comprising a power device housing, a junction box, an AC terminal, and a DC terminal. The junction box is disposed on one side of the power device housing and comprises a junction box housing and a junction box cover. The bottom wall of the junction box housing, facing the power device housing, has a first mounting hole and a second mounting hole. The lower end of the junction box housing is provided with a mounting channel for mounting cables and / or OT terminals. The AC terminal passes through the first mounting hole and is secured to the power device housing. The DC terminal passes through the second mounting hole and is secured to the power device housing.

[0008] Beneficial effects: The power equipment wiring structure provided by the utility model has a first mounting hole and a second mounting hole on the bottom wall of the junction box shell facing the power equipment shell, so that the AC terminal can pass through the first mounting hole and be fixed to the power equipment shell, and the DC terminal can pass through the second mounting hole and be fixed to the power equipment shell, thereby realizing the installation of the AC terminal and the DC terminal on the same side, adopting the AC terminal and DC terminal through-wall solution, and considering the overcurrent of the AC and DC terminals, the AC terminals and the DC terminals share a set of plastic shell molds, thereby avoiding accidents caused by poor contact when the terminals pass through large currents; at the same time, it saves the cost of opening a set of terminal molds, saves project development costs, reduces the volume of the product, saves the installation time of the AC terminals and the DC terminals, and improves installation efficiency.

[0009] In an optional embodiment, there is a first distance between the front end face of the AC terminal and the side wall of the power device housing, and there is a second distance between the front end face of the DC terminal and the side wall of the power device housing. The first distance and the second distance are not equal, so that the AC terminal and the DC terminal are arranged in a stepped manner.

[0010] In an optional embodiment, the AC terminal is connected to a side wall of the power device housing via a fixing member, such that the first distance is greater than the second distance.

[0011] In an optional embodiment, the junction box also includes a first elastic support plate and a second elastic support plate, the first elastic support plate is detachably connected to the lower end of the junction box shell, the second elastic support plate is detachably connected to the lower end of the junction box cover, the first elastic support plate and the second elastic support plate cooperate, and the installation channel is located between the first elastic support plate and the second elastic support plate.

[0012] In an optional embodiment, the first elastic support plate is provided with a first notch, and a second notch is provided at a corresponding position of the second elastic support plate, and the second notch cooperates with the first notch to form a mounting channel.

[0013] In an optional embodiment, the first notch and the second notch are provided with at least two shear cuts, and different shear cuts constitute installation channels of different sizes for accommodating cables of different sizes to pass through.

[0014] In an optional embodiment, the first elastic support plate and the second elastic support plate are both provided with a plurality of water leakage holes.

[0015] In an optional embodiment, the lower side wall of the junction box shell is provided with a first plug-in slot, and the first elastic support plate is plugged into the first plug-in slot; the lower side wall of the junction box cover is provided with a second plug-in slot, and the second elastic support plate is plugged into the second plug-in slot.

[0016] In an optional embodiment, a sealing strip is provided on the inner wall of the junction box upper cover. When the junction box upper cover and the junction box housing are tightly connected, the sealing strip is pressed between the junction box upper cover and the junction box housing.

[0017] In a second aspect, the utility model also provides a photovoltaic system, including an AC cable, a DC cable and a power equipment wiring structure of any one of the above technical solutions; the AC cable is connected to the AC terminal of the power equipment wiring structure through an installation channel; the DC cable is connected to the DC terminal of the power equipment wiring structure through an installation channel.

[0018] Beneficial effects: Since the photovoltaic system includes the power device wiring structure, it has all the beneficial effects of the power device wiring structure, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of a power device wiring structure according to an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 The schematic diagram of the power equipment wiring structure shown is a schematic diagram of the structure after the junction box cover is removed;

[0022] Figure 3 The main view of the power equipment wiring structure after connecting the cables;

[0023] Figure 4 This is a schematic structural diagram of the junction box from a first-person perspective;

[0024] Figure 5 This is a schematic diagram of the overall structure of the junction box after the cables are connected;

[0025] Figure 6 for Figure 4 A schematic structural diagram of the junction box from a second perspective is shown;

[0026] Figure 7 Schematic diagram of the structure of the junction box housing;

[0027] Figure 8 It is a structural diagram of the junction box cover;

[0028] Figure 9is a schematic structural diagram of the first elastic support plate or the second elastic support plate;

[0029] Figure 10 This is a schematic diagram of the structure of the AC terminal and DC terminal ladder arrangement;

[0030] Figure 11 for Figure 10 A partial enlarged view of the middle junction box.

[0031] Description of reference numerals:

[0032] 1. Power device housing; 2. Junction box; 21. Junction box housing; 211. First mounting hole; 212. Second mounting hole; 22. Junction box cover; 23. Mounting channel; 24. Fixing piece; 25. First elastic support plate; 26. Second elastic support plate; 27. Cutout; 28. Leakage hole; 29. ​​Sealing strip; 210. Waterproof pad; 220. Bolt; 230. Grounding piece; 240. Aluminum extruded support piece; 3. AC terminal; 4. DC terminal; 5. AC cable; 51. First OT terminal; 52. AC line; 6. DC cable; 61. Second OT terminal; 62. DC line. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The following combination Figures 1 to 11 , describing the embodiments of the present utility model.

[0035] According to an embodiment of the present invention, in one aspect, a power device wiring structure is provided, comprising a power device housing 1, a junction box 2, AC terminals 3, and DC terminals 4. The junction box 2 is disposed on one side of the power device housing 1 and comprises a junction box housing 21 and a junction box cover 22. The bottom wall of the junction box housing 21, facing the power device housing 1, has a first mounting hole 211 and a second mounting hole 212. The lower end of the junction box housing 21 is provided with a mounting channel 23 for mounting cables and / or OT terminals. The AC terminal 3 passes through the first mounting hole 211 and is secured to the power device housing 1. The DC terminal 4 passes through the second mounting hole 212 and is secured to the power device housing 1.

[0036] In the power device wiring structure provided by the embodiment of the present invention, since the bottom wall of the junction box housing 21 facing the power device housing 1 has a first mounting hole 211 and a second mounting hole 212, the AC terminal 3 can pass through the first mounting hole 211 and be fixed to the power device housing 1, and the DC terminal 4 can pass through the second mounting hole 212 and be fixed to the power device housing 1, thereby achieving the installation of the AC terminal 3 and the DC terminal 4 on the same side. A through-wall solution is adopted for the AC and DC terminals 3 and 4. In addition, when considering overcurrent of the AC and DC terminals 4, the AC terminals 3 and the DC terminals 4 share a set of plastic shell molds, thereby avoiding accidents caused by poor contact when the terminals pass high current. At the same time, the cost of opening a set of terminal molds can be saved, saving project development costs. At the same time, compared with the solution of using a junction box for each terminal, the AC terminals 3 and the DC terminals 4 in the present invention share a junction box, which can save the cost of the junction box. In addition, the volume of the product can be reduced, the installation time of the AC terminals 3 and the DC terminals 4 can be saved, and the installation efficiency can be improved.

[0037] By providing an installation channel 23 at the lower end of the junction box housing 21, the installation channel 23 facilitates the installation of cables and / or OT terminals, facilitates the crimping of cable terminals outside the junction box 2, and allows the installation of cables with different multi-core wire diameters. Regarding the installation channel 23, in this embodiment, the lower end of the junction box housing 21 is open, forming the installation channel 23. This can prevent the situation where the OT terminals are too large or the cables are too rigid to fit inside the junction box 2 after the OT terminals are crimped.

[0038] Specifically, the junction box housing 21 is secured to the side of the power device housing 1 via bolts 220. To ensure the IP66 protection rating of the power device housing 1, the junction box 2 is equipped with an adhesive waterproof gasket 210. To ensure the IP66 protection rating of the power device interior, the AC terminals 3 and DC terminals 4 are in contact with the power device housing 1 via an adhesive waterproof strip secured with bolts 220.

[0039] Furthermore, in this embodiment, the first mounting hole 211 and the second mounting hole 212 are square holes, which can adapt to the structure of an AC terminal or a DC terminal.

[0040] In some embodiments, the front end face of the AC terminal 3 is at a first distance from the side wall of the power device housing 1, and the front end face of the DC terminal 4 is at a second distance from the side wall of the power device housing 1. The first distance and the second distance are not equal, so that the AC terminal 3 and the DC terminal 4 are arranged in a stepped manner.

[0041] Since the AC terminal 3 and the DC terminal 4 are arranged in a stepped manner, the installation interference and electrical safety distance problems are solved, which saves space and reduces the customer's time in going back and forth to the site for installation and wiring.

[0042] Specifically, the front end surface of the AC terminal 3 and the front end surface of the DC terminal 4 are end surfaces for wiring. Figure 11 As shown in the figure, L1 is the first distance and L2 is the second distance. Figure 11 In the orientation shown, the front end face of the AC terminal 3 refers to its upper end face, and similarly, the front end face of the DC terminal refers to its upper end face.

[0043] In some embodiments, the AC terminal 3 is connected to the side wall of the power device housing 1 through the fixing member 24 so that the first distance is greater than the second distance.

[0044] By providing a fixing member 24 and mounting the AC terminal 3 thereon, the AC terminal 3 and the DC terminal 4 can be fixed in different planes, achieving a stepped arrangement of the AC terminals 3 and 4. Specifically, the fixing member 24 is fixed to the side of the power device housing 1 by full welding. The DC terminal 4 is directly secured to the power device housing 1 by bolts after passing through the second mounting hole 212.

[0045] In some embodiments, the junction box 2 also includes a first elastic support plate 25 and a second elastic support plate 26, the first elastic support plate 25 is detachably connected to the lower end of the junction box shell 21, and the second elastic support plate 26 is detachably connected to the lower end of the junction box cover 22, the first elastic support plate 25 and the second elastic support plate 26 cooperate, and the installation channel 23 is located between the first elastic support plate 25 and the second elastic support plate 26.

[0046] The first and second elastic support plates 25, 26 form the installation channel 23 and provide protection after the junction box cover 22 is connected to the junction box housing 21. The first elastic support plate 25 and the junction box housing 21, as well as the second elastic support plate 26 and the junction box cover 22, are detachably connected, facilitating assembly.

[0047] In some embodiments, the first elastic support plate 25 is provided with a first notch, and a corresponding position of the second elastic support plate 26 is provided with a second notch, and the second notch cooperates with the first notch to form the installation channel 23 .

[0048] By providing a first notch on the first elastic support plate 25 and a second notch on the second elastic support plate 26, the first notch and the second notch cooperate to form a mounting channel 23, which can be used to install cables or crimp terminals. Forming the mounting channel 23 by two elastic support plates with notches facilitates processing and assembly.

[0049] In some embodiments, the first notch and the second notch are provided with at least two cutouts 27 , and different cutouts 27 constitute installation channels 23 of different sizes for accommodating cables of different sizes to pass through.

[0050] By setting at least two cutting notches 27 on the first notch and the second notch, different cutting notches 27 can be cut correspondingly for cables with different wire diameters, so that the installation channel 23 formed by the first notch and the second notch can meet the installation requirements of cables with different wire diameters.

[0051] In some embodiments, the first elastic support plate 25 and the second elastic support plate 26 are both provided with a plurality of water leakage holes 28 .

[0052] Since the first elastic support plate 25 and the second elastic support plate 26 are located at the bottom of the junction box 2, by providing a plurality of water leakage holes 28 on the first elastic support plate 25 and the second elastic support plate 26, it is possible to prevent the normal operation of the machine from being affected by water accumulation, thereby improving the electrical safety and reliability of the power equipment.

[0053] In some embodiments, the lower side wall of the junction box housing 21 is provided with a first plug-in slot, and the first elastic support plate 25 is plugged into the first plug-in slot; the lower side wall of the junction box cover 22 is provided with a second plug-in slot, and the second elastic support plate 26 is plugged into the second plug-in slot.

[0054] In this arrangement, the first elastic support plate 25 is plugged into the lower side wall of the junction box housing 21 , and the second elastic support plate 26 is plugged into the lower side wall of the junction box upper cover 22 , which facilitates assembly.

[0055] Specifically, the first elastic support plate 25 and the second elastic support plate 26 include silicone.

[0056] In some embodiments, a sealing strip 29 is provided on the inner wall of the junction box cover 22 . When the junction box cover 22 and the junction box housing 21 are fastened together, the sealing strip 29 is compressed between the junction box cover 22 and the junction box housing 21 .

[0057] This arrangement can ensure that the junction box upper cover 22 and the junction box housing 21 meet the dust and water resistance requirements of IP66.

[0058] Specifically, in this embodiment, the junction box cover 22 is fixed to the junction box shell 21 by four bolts 220. When the junction box shell 21 and the junction box cover 22 are fixed by the bolts 220, the sealing strip 29, the first elastic support plate 25 and the second elastic support plate 26 are compressed to achieve the IP protection requirements of the junction box.

[0059] Furthermore, the sealing strip 29 is made of PU foam.

[0060] Furthermore, a waterproof pad 210 is provided between the sealing surfaces of the junction box upper cover 22 and the junction box housing 21. Specifically, the waterproof pad 210 can also be made of silicone.

[0061] In some embodiments, a grounding member 230 is further fixed to the side wall of the junction box housing 21 via bolts 220 .

[0062] In some embodiments, an aluminum extruded support member 240 is further connected to the mounting surface of the junction box housing 21 facing the junction box upper cover 22 via bolts 220 .

[0063] According to an embodiment of the present invention, on the other hand, a photovoltaic system is also provided, including an AC cable 5, a DC cable 6 and a power device wiring structure described in any one of the above embodiments; the AC cable 5 is connected to the AC terminal 3 of the power device wiring structure through an installation channel 23; the DC cable 6 is connected to the DC terminal 4 of the power device wiring structure through the installation channel 23.

[0064] Furthermore, the AC cable 5 includes a first OT terminal 51 and an AC line 52, and the DC cable 6 includes a second OT terminal 61 and a DC line 62. To ensure basic protection for the AC and DC cables 5 and 6, the first and second elastic support plates 25 and 26 are provided with cutouts 27 of different sizes. The first elastic support plate 25 can be cut to form a first notch of corresponding size, and the second elastic support plate 26 can be cut to form a second notch of corresponding size, to ensure basic cable protection.

[0065] Because the photovoltaic system includes a power device wiring structure, it has the same effect as the power device wiring structure and will not be described in detail here.

[0066] Furthermore, the photovoltaic system also includes solar panels, power equipment and energy storage systems. Solar panels use the photovoltaic effect generated when sunlight irradiates semiconductor materials to convert sunlight into electrical energy. At this time, the voltage of the electrical energy is unstable and cannot be used directly. Therefore, power equipment is required to rectify the current and convert the power so that the photovoltaic system can output power that matches the electrical equipment. However, the electricity generated by the photovoltaic system is intermittent, so the supporting energy storage system stores the excess electricity and uses it through peak-shaving and frequency modulation and peak-shaving and valley-filling modes. Power equipment includes but is not limited to rectifiers, converters and inverters. Accordingly, the power equipment housing 1 can be a rectifier housing, a converter housing or an inverter housing.

[0067] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A power equipment wiring structure, characterized in that: include: Power device housing (1); A junction box (2), the junction box (2) being arranged on one side of the power device housing (1), the junction box (2) comprising a junction box housing (21) and a junction box upper cover (22); a bottom wall of the junction box housing (21) facing the power device housing (1) having a first mounting hole (211) and a second mounting hole (212); a lower end of the junction box housing (21) being provided with a mounting channel (23) for mounting cables and / or OT terminals; an AC terminal (3), the AC terminal (3) passing through the first mounting hole (211) and fixed to the power device housing (1); A DC terminal (4) passes through the second mounting hole (212) and is fixed to the power device housing (1).

2. The power equipment wiring structure according to claim 1, characterized in that: There is a first distance between the front end face of the AC terminal (3) and the side wall of the power device housing (1), and there is a second distance between the front end face of the DC terminal (4) and the side wall of the power device housing (1), and the first distance and the second distance are different, so that the AC terminal (3) and the DC terminal (4) are arranged in a stepped manner.

3. The power equipment wiring structure according to claim 2, characterized in that: The AC terminal (3) is connected to the side wall of the power device housing (1) via a fixing member (24) so ​​that the first distance is greater than the second distance.

4. The power device connection structure according to any one of claims 1 to 3, characterized in that: The junction box (2) further comprises a first elastic support plate (25) and a second elastic support plate (26), wherein the first elastic support plate (25) is detachably connected to the lower end of the junction box housing (21), and the second elastic support plate (26) is detachably connected to the lower end of the junction box upper cover (22), the first elastic support plate (25) and the second elastic support plate (26) cooperate, and the mounting channel (23) is located between the first elastic support plate (25) and the second elastic support plate (26).

5. The power equipment wiring structure according to claim 4, characterized in that: The first elastic support plate (25) is provided with a first notch, and a corresponding position of the second elastic support plate (26) is provided with a second notch, and the second notch cooperates with the first notch to form the installation channel (23).

6. The power equipment wiring structure according to claim 5, characterized in that: The first notch and the second notch are provided with at least two shear cuts (27), and different shear cuts (27) form installation channels (23) of different sizes, which are used to adapt to the passage of cables of different sizes.

7. The power equipment wiring structure according to claim 4, characterized in that: The first elastic support plate (25) and the second elastic support plate (26) are both provided with a plurality of water leakage holes (28).

8. The power equipment wiring structure according to claim 4, characterized in that: The lower side wall of the junction box housing (21) is provided with a first plugging slot, and the first elastic support plate (25) is plugged into the first plugging slot; A second plugging slot is provided on the lower side wall of the junction box upper cover (22), and the second elastic support plate (26) is plugged into the second plugging slot.

9. The power device connection structure according to any one of claims 1 to 3, characterized in that: A sealing strip (29) is provided on the inner wall of the junction box upper cover (22). When the junction box upper cover (22) and the junction box housing (21) are tightly connected, the sealing strip (29) is pressed between the junction box upper cover (22) and the junction box housing (21).

10. A photovoltaic system, characterized in that: include: The power device wiring structure according to any one of claims 1 to 9; an AC cable (5), the AC cable (5) being connected to an AC terminal (3) of the power device wiring structure through the mounting channel (23); A DC cable (6) is connected to a DC terminal (4) of the power device wiring structure through the installation channel (23).

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