JPH10223282A - Cable waterproof structure and outside installation linkage inverter in solar power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make waterproof structure more inexpensive and reliable. SOLUTION: A connecting box has a terminal board 2 and a terminal board cover 4, the terminal board 2 has a plurality of first comb-blade parts in the lower part of a terminal board main body 8 to which a cable 16 is fixed, a fixing body 12 is arranged on each base part side of first comb-blade parts 10, the terminal board cover 4 has a plurality of second comb-blade parts 24 corresponding to the first comb-blade parts 10, a fixing body 28 is arranged on each base part side of the second comb-blade part 24. When the terminal board 2 and the terminal board cover 4 are assembled, a cable 16 is inserted through a gap between the both comb-blade parts 10, 24, and interposed between the fixing bodies 10, 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof cable structure, for example, for converting output power of a solar cell into AC power and connecting the power to an outdoor-installed grid-connected inverter capable of reverse power flow to a system distribution line. The present invention relates to a cable waterproof structure suitable for a box.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view from the front side of an outdoor system interconnection type inverter (hereinafter simply referred to as an inverter) in a conventional photovoltaic power generation system. Is the inverter body 5
2 is provided with an input / output cable connection box (hereinafter, referred to as a connection box) 54 at a lower portion, and a structure having a pair of installation legs 56 on both sides of the connection box 54. In such an inverter 50, since it is installed outdoors, it is required that the insertion connection portion of the input / output cable in the connection box 54 has a waterproof structure. In the inverter 50 in this system,
A considerable number of input / output cables are required for system output input from the solar cell side, input / output of various on / off signals, and the like.

FIG. 9 is a perspective view showing the connection box 54 shown in FIG. 8 together with the input / output cables 58 when viewed from the back side. Referring to FIG. For waterproofing at each insertion connection portion, this connection box 54 is entirely sealed with a cable cover 60, and has a plurality of connector mounting holes (not shown) formed on the front side thereof. A waterproof connector 62 is attached via a connector, and a plurality of waterproof input / output cables 58 are connected to the plurality of waterproof connectors 62, respectively. It is designed to be waterproof at the insertion connection part. FIG. 10 is an exploded perspective view of another conventional connection box 54a. The connection box 54a shown in FIG. 6 includes an input / output cable terminal block 64 and a cable cover 66 thereof.
By attaching the cable cover 66 to the input / output cable terminal block 64, these are waterproofed, and a plurality of input / output cable insertion holes are formed in the input / output cable terminal block 64. Rubber bush 68 with a cross cut in the center of each hole
Are mounted, so that a plurality of input / output cables 70 can be inserted into the connection box 54a through the cuts in the rubber bush 68 of the input / output cable insertion holes.

[0004] In addition, the connection box is formed as shown in FIG. 11 which is an internal view of FIG. 10 and FIG. 12 which is a cross-sectional view taken along the line dd in FIG.
Further, as described with reference to FIG. 13 corresponding to FIG. 11 and FIG. 14 corresponding to FIG.
In order to further prevent the input / output cable 70 from coming off or coming into contact due to external stress after passing the input / output cable 70 therein, the input / output cable 70 is fixed by an input / output cable fixing part 72.

[0005]

In the above-mentioned conventional connection box, first, in the connection box shown in FIG. 9, the waterproof connector is expensive in price, so that the manufacturing cost of the inverter is increased. In addition, there is a problem that it becomes a major factor in the
Since a large-sized connector for withstanding the current is required as a connector used for the connection, there is also a problem that it becomes a hindrance factor to a reduction in the weight and size of the inverter.

Further, in the connection box shown in FIG. 10, it is necessary to open input / output cable insertion holes for attaching rubber bushes by at least several input / output cables at the time of outdoor installation work. Since it is necessary to fix the plurality of input / output cables with the input / output cable fixing parts, there has been a problem that a great deal of time and labor are required for the construction.

[0007]

In the cable waterproof structure according to the present invention, a cable to be waterproofed is inserted into the structure through a cable insertion portion of the structure. A cable waterproof structure characterized by having a waterproof function at the cable insertion portion in a state in which the two fixed bodies are sandwiched by the cable, while being clamped and fixed by a pair of upper and lower elastic fixed bodies. The above-mentioned problem has been solved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cable waterproof structure according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a cable waterproof structure between a connection box of an inverter in a photovoltaic power generation system and an input / output cable connected thereto will be described, but the present invention is not limited to this. For example, it is applied to a connection box for wiring a cable in a power meter, or to a structure that needs to be waterproofed at a part where a cable is inserted into the inside of the structure.

As shown in FIG. 1, a connection box as a structure to which the cable waterproof structure according to the present embodiment provided at the lower part of the inverter body is applied and which is to be waterproof inside is a first structure. , A terminal block cover 4 as a second structure, and a cable cover 6.

The terminal block 2 is shown in FIG. 2 and FIG. FIG. 2 is a front view from the inside of the terminal block, and FIG. 3 is a sectional view taken along the line aa in FIG. Referring to FIGS. 1 to 3, the terminal block 2 has a terminal block body 8, a plurality of comb blade portions 10 integrally formed on the lower end side of the terminal block body 8, and a cable fixing body 12. doing.

The terminal block body 8 has a plurality of terminal fittings 14 arranged in a row in the longitudinal direction. One end of each input / output cable 16 is fixed to each of the terminal fittings 14. In the figure, each of the plurality of comb blade portions 10 is extended a predetermined length in the vertical direction from the base side to the end side, and has a predetermined width in the horizontal direction,
They are arranged at equal intervals in the longitudinal direction of the terminal block main body 8 with at least the cable diameter of the input / output cable 16.
Each of the input / output cables 16 is inserted from the outside through the terminal 8 into the inside of the terminal block 2. Cable fixing body 12
May be any material having elasticity and waterproofness. For example, it is made of EP rubber and is long in the longitudinal direction of the terminal block main body 8 and about half of the vertical length from the base side of each comb blade portion 10 in the figure. This occupies a predetermined portion above the base of the gap 18 and faces the comb blade portion 10 with a predetermined space 20 therebetween. As a result, each of the comb blade portions 10 has the predetermined gap 18 on the end side.

The terminal block cover 4 is shown in FIG. 4 and FIG. FIG. 4 is a front view from the inside of the terminal block cover 4, and FIG. 5 is a cross-sectional view along the line bb in FIG. The terminal block cover 4 has a horizontal portion 22 whose side shape extends horizontally.
And a plurality of comb blade portions 24 perpendicular to this. Each of the plurality of comb blade portions 24 has a predetermined length in the vertical direction and a predetermined width in the horizontal direction in the figure, and has at least the input / output cable 16 in the longitudinal direction of the horizontal portion 22 with respect to each other. The input / output cables 16 are arranged at equal intervals with the cable diameter therebetween, and each of the input / output cables 16 is connected to the terminal block 2 from the outside through a gap 26 (same or substantially the same as the gap 18) of each of the comb blade portions 24.
It can be inserted inside. The terminal block cover 4 includes a cable fixing member 28 having the same configuration as the cable fixing member 22 on the terminal block 2 side.
It is mounted so as to be in close contact with the junction with the.

In the connection box provided with the terminal block 2 and the terminal block cover 4, as described with reference to FIGS. 2 and 3, the input / output cable 16 is connected to each of the comb blade portions 10 of the terminal block 2. One end is inserted through the gap 18 and fixed to each terminal fitting 14 of the terminal block body 8. In this state, the terminal block cover 4 shown in FIGS. 4 and 5 is moved toward the terminal block 2, and is passed through the gap 20 between the fixed body 12 of the terminal block 2 and each comb blade portion 10. Are positioned. As a result, FIG.
As shown in FIG. 7 and FIG. 7, the input / output cable 16 is elastically and firmly held between the fixed bodies 12 and 28. In this pinched state, the plurality of input / output cables 16
Since the surroundings are individually covered with the fixed bodies 12 and 28 in close contact with each other, rainwater or the like does not enter from outside through the space between the fixed bodies 12 and 28.

When the terminal block 2 and the terminal block cover 4 have been mounted as described above, the cable cover 6 shown in FIG. Wiring ends.

The above-mentioned fixed bodies 10 and 24 have a waterproof function and also have a function of holding down the input / output cable 16. Also, since a plurality of input / output cables 16 can be simultaneously fixed by the pair of upper and lower fixed bodies 10 and 24,
The work of assembling the input / output cable 16 becomes easy.

[0016]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, a cable inserted into the structure through a cable insertion portion of the structure whose interior is to be waterproof is provided with a pair of upper and lower elasticities at the insertion portion. The cable has a waterproof structure at the cable insertion portion in a state where the cable is clamped, and the cable is elastically firmly fixed by the two fixed bodies. The two fixed bodies are elastic and the two fixed bodies adhere to each other, so that there is no danger of rainwater or the like entering between the two fixed bodies and the waterproof function can be fully exhibited, and the waterproof structure is simple. It has become something.

According to the second aspect of the present invention, since the structure according to the first aspect is a connection box used for an interconnected inverter installed outdoors in a photovoltaic power generation system, a waterproof connector which is expensive in price as in the prior art. This eliminates the need for the use of inverters and thus eliminates a major factor in increasing the manufacturing cost of inverters. In addition, in interconnected photovoltaic power generation systems, it is necessary to use connectors as in the past even if a large current flows through the input / output cables Since no large connector is required to withstand the large current, the weight and size of the inverter can be greatly reduced. Furthermore, there is no need to open the input / output cable insertion hole for attaching the rubber bush at the cable insertion part as in the past when installing outdoors, and furthermore, these multiple input / output cables are attached with the input / output cable fixing parts. Since there is no need to fix, it can greatly contribute to shortening the construction period.

According to the third aspect of the present invention, the structure according to the first aspect has a first structure portion and a second structure portion, and the first structure portion has a cable fixed thereto. A plurality of first comb blade portions are provided at a lower portion of the main body, and one of the fixed bodies is provided on a base side of each of the first comb blade portions, and a second structure portion is provided. It has a plurality of second comb blade portions corresponding to each of the plurality of first comb blade portions, and the other of the two fixed bodies is the second comb blade portion.
Are arranged on the base side of each of the comb blade portions, and when the two structural portions are assembled via the both comb blade portions, the cable is connected through a gap between the end portions of the both comb blade portions. Since the cable is a waterproof structure that is inserted and held between the fixed bodies in the inserted state, the cable is inserted, for example, from the gap between the first comb blade part end sides of the first structure, When the two structures are assembled with their comb blades facing each other, the cable is elastically and firmly held between the two fixed bodies, and the two fixed bodies are closely adhered to each other by their elasticity, and the The inside is waterproofed by both fixed bodies, and the waterproofing function can be sufficiently exhibited.

According to the fourth aspect of the present invention, there is provided at least an inverter main body and a connection box provided therein.
The connection box clamps and fixes a cable inserted therein through a cable insertion portion with a pair of upper and lower resilient fixed bodies at the insertion portion, and the two fixed bodies are clamped by the cable. Since the inverter is installed outdoors in a photovoltaic power generation system having a waterproof function at the cable insertion portion, the waterproof structure is simplified and the waterproof function is sufficiently provided.

According to the invention of claim 5, the connection box according to claim 4 has a terminal block and a terminal block cover,
The terminal block has a plurality of first comb blade portions at a lower portion of a terminal block body to which a cable is fixed, and one of the fixed bodies is disposed on a base side of each of the first comb blade portions. The terminal block cover has a plurality of second comb blade portions corresponding to the plurality of first comb blade portions, respectively, and the other of the fixed bodies is the second comb blade portion. It is arranged on each base side, and when the terminal block and the terminal block cover are assembled, the cable is inserted through the gap between the two comb blade portions and is sandwiched between the two fixed bodies in this inserted state. Because it is an outdoor-installed interconnected inverter in a solar power generation system, it is possible to fully exhibit a waterproof function.

[Brief description of the drawings]

FIG. 1 is a perspective view of a connection box according to an embodiment of the present invention.

FIG. 2 is a front view of the connection box from the inside of the terminal block.

FIG. 3 is a sectional view taken along the line aa in FIG. 2;

FIG. 4 is a front view from the inside of the terminal block cover of the connection box.

FIG. 5 is a sectional view taken along the line bb in FIG. 4;

FIG. 6 is a front view from the inside when the terminal block cover is assembled to the terminal block.

FIG. 7 is a sectional view taken along the line cc in FIG. 6;

FIG. 8 is a perspective view of an inverter.

FIG. 9 is a perspective view of a conventional example of a connection box.

FIG. 10 is another perspective view of another conventional connection box.

11 is a front view from the inside of the connection box of FIG. 10;

FIG. 12 is a sectional view taken along the line dd in FIG. 11;

FIG. 13 is a front view corresponding to FIG. 11 with additional fixed parts.

FIG. 14 is a sectional view corresponding to FIG. 12 and showing additional fixed parts.

[Explanation of symbols]

 2 Terminal block 4 Terminal block cover 6 Cable cover 8 Terminal block body 10 Comb blade part 12 Cable fixed body 14 Terminal fitting 16 Input / output cable 18 Gap 20 Spacing 22 Horizontal part 24 Comb blade part 26 Gap 28 Cable fixed body

Claims (5)

[Claims] 1. A cable inserted into a structure to be waterproofed through a cable insertion portion of the structure to be waterproofed by a pair of upper and lower fixed elastic members at the insertion portion. A cable waterproof structure, wherein both the fixed bodies have a waterproof function at the cable insertion portion when the cable is held therebetween. 2. The cable waterproof structure according to claim 1, wherein the structure is a connection box used for an interconnection inverter installed outdoors in a photovoltaic power generation system. 3. The structure according to claim 1, wherein said structure has a first structure portion and a second structure portion, and said first structure portion is provided with a plurality of first combs at a lower portion of a main body to which a cable is fixed. One of the fixed bodies is provided on a base side of each of the first comb blade portions, and a second structure portion is provided on each of the plurality of first comb blade portions. And a plurality of second comb blade portions corresponding to the second comb blade portion, and the other of the two fixed bodies is disposed on the base side of each of the second comb blade portions, and the both structural portions are connected to the two comb blade portions. The cable is inserted through a gap between the end sides of the two comb blade portions when assembled through the comb blade portions, and is sandwiched between the fixed bodies in this inserted state. The cable waterproof structure according to claim 1. 4. An inverter having at least an inverter body and a connection box provided therein, wherein the connection box is provided with a pair of upper and lower elastic members at the insertion portion for a cable inserted therein through a cable insertion portion. An interconnected inverter installed outdoors in a photovoltaic power generation system, wherein the fixed body has a waterproof function at the cable insertion portion while the cable is held between the fixed bodies. 5. The connection box has a terminal block and a terminal block cover, and the terminal block has a plurality of first comb blade portions below a terminal block body to which a cable is fixed. One of the fixed bodies is disposed on the base side of each of the first comb blade portions, and the terminal block cover is provided with a plurality of second comb blade portions corresponding to each of the plurality of first comb blade portions. And the other of the two fixed bodies is disposed on the base side of each of the second comb blade portions, and when the terminal block and the terminal block cover are assembled, the cable is connected to the two comb blade portions. 5. The device according to claim 4, wherein the fixing member is inserted through a gap and is sandwiched between the fixed members in the inserted state.
Outdoor-connected interconnection inverter in the photovoltaic power generation system according to 1.