JP2000340821A - Solar cell terminal box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solar cell terminal box which has superior moisture- proofness, can reduce the thickness of the terminal box as a whole, to prevent a solar cell module from protruding from a frame and increase its inner width to enable the attachment of a cable ground. SOLUTION: A cover member 2 in put on a box main part 1. Attachment shafts 21 of the cover member 2 are inserted into recessed parts 16 of the box main part 1 and tightening screws 3 inserted through the through-hole 22 of the attachment shafts 21 are screwed into screw holes 17 of the recessed parts 16 so as to fix the cover member 2 to the box main part 1. Since the screw tightening torque is supported with by the attachment shafts 21, the thickness of the terminal box as a whole can be reduced to prevent a solar cell module from protruding from the frame, and further, the thickness of the cover member 2 can be reduced to increases the inner width of the terminal box, so that a cable ground 6 can be attached to the box.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell terminal box which is mounted on a solar cell module in order to extract the electromotive force of the solar cell to the outside.

[0002]

2. Description of the Related Art In general, a solar cell module has a take-in hole for taking in an output wire from the solar cell module, and a take-out hole for taking out an output take-out wire electrically connected to the output wire. A terminal box having an extraction hole is mounted, and the electromotive force of the solar cell is extracted to the outside via the terminal box.

In such a conventional terminal box, as shown in FIG. 5A, a screw tightening portion c is projected from each side surface of a box body a and a cover member b, and a tightening screw d is formed on the screw tightening portion c. Is screwed in to fix the lid member b to the box body a. As shown in (b), the locking claw e projected from the side face of the lid member b is projected from the side face of the box body a. The cover member b is locked to the box body a
There are those that stick to.

[0004]

However, although the fixing with the fastening screw has the advantage that the waterproof property is good for a long time, the screw fastening portion is projected from the side surface of the lid member with the same thickness. In addition, in order to withstand the torque required for the tightening screw, it is necessary to increase the thickness of the lid member, which is the thickness of the screw tightening portion, to some extent. For this reason, the thickness of the entire terminal box becomes large, and when the solar cell module is viewed from the side, the terminal box often protrudes downward from the frame material for holding the solar cell module. Therefore, in order to fill the difference in thickness when installing the solar cell module, a member for raising the height is required, and there is a problem that the material cost and the construction cost due to the member increase.

The thickness of the entire terminal box may be reduced so that the terminal box does not protrude from the frame material. However, as described above, the thickness of the cover member is increased to some extent due to the torque required for the tightening screw. Therefore, the inner width of the terminal box is reduced accordingly. If it becomes smaller than a certain extent, it becomes impossible to attach a cable gland for fixing and waterproofing the output extraction wire. If the cable gland is not attached, the pulling force from the output extraction wire is directly applied to the connection portion with the output wire, so that disconnection easily occurs and the waterproofness becomes insufficient.

[0006] On the other hand, in the case of fixing with a locking claw, the screw tightening process can be simplified and the number of parts is reduced as compared with a method using a tightening screw. May protrude from the side surface of the lock, and the locking claw may be damaged at the time of use, and the long-term waterproofness in outdoor use is not sufficient as compared with the case of the fastening screw.

Therefore, the present invention solves the above-mentioned problems,
Solar cell terminals with excellent waterproof properties, reduced thickness of the terminal box as a whole, and no protrusion from the frame material of the solar cell module. No box will be provided.

[0008]

In order to achieve the above object, the present invention has the following arrangement. That is, the solar cell terminal box according to the present invention is mounted on a solar cell module, and a take-in hole for taking in an output wire from the solar cell module, and an output take-out wire electrically connected to the output wire. A terminal box for a solar cell having an extraction hole for taking out to the outside, comprising a box body and a lid member put on the box body, the lid member is attached to a mounting shaft protruding from the back side, A through hole through which a tightening screw can be inserted is drilled, and the box body has a recess in which the mounting shaft is fitted.
A screw hole into which a tightening screw is screwed is formed, a cover member is put on the box body, a mounting shaft of the cover member is fitted into a recess of the box body, and a tightening screw inserted through the through hole of the mounting shaft. Is screwed into the screw hole of the recess, so that the lid member is fixed to the box body.

According to the present invention, since the lid member is fixed to the box body by the fastening screw, the waterproof property is excellent. The tightening screw is inserted into a through hole of a mounting shaft protruding from the lid body and screwed into a screw hole of the box body.
That is, the screw tightening torque is made to endure by the mounting shaft, and is not made to endure by the thickness of the lid member, so that the thickness of the lid member can be reduced. From this, it is possible to reduce the thickness of the entire terminal box and eliminate the protrusion from the frame material of the solar cell module,
Since the inner width of the terminal box can be increased by reducing the thickness of the lid member, the cable gland can be attached.

Further, the mounting shaft is adapted to be fitted into a concave portion of the box main body, and the distal end portion is supported by the concave portion to improve the strength. Can withstand.

[0011]

Next, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a terminal box according to the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 shows a state where the terminal box according to the present invention is mounted on a solar cell module. 4 is a sectional view of FIG.

In the drawings, 1 is a box body, 2 is a lid member,
3 is a tightening screw.

The box body 1 is formed by four side walls 11 and a bottom wall 12 and has an open top.
2 is provided with an intake hole 13 so that the output wire 41 from the solar cell module 4 can be taken in from the intake hole 13, and an extraction hole 14 is provided in the side wall 11. The output take-out wire 5 electrically connected to the output wire 41 through the take-out hole 14 can be taken out.

A cable gland 6 can be attached to the take-out hole 14, and the cable gland 6 can seal around the take-out hole 14 through which the output take-out wire 5 is inserted.

Further, inside the box body 1, thick portions 15 are provided at four corners, and a concave portion 16 is formed in each of the thick portions 15, and a tightening screw 3 is screwed into a lower portion of the concave portion 16. A screw hole 17 is formed.

The lid member 2 is placed over the upper part of the opening of the box main body 1. At the position corresponding to the concave part 16 of the box main body 1, a mounting shaft 21 fitted into the concave part 16 is provided on the back surface. Further, a through hole 22 through which the tightening screw 3 can be inserted is formed in the mounting shaft 21.

With this configuration, the cover member 2 is put on the box body 1, and the mounting shaft 21 of the cover member 2 is fitted into the recess 16 of the box body 1, and the fastening screw inserted through the through hole 22 of the mounting shaft 21 is provided. By screwing 3 into screw hole 17, lid member 2 can be fixed to box body 1. The tightening screw 3 may be screwed into the screw hole 17, or a nut 31 may be arranged at the outlet of the screw hole 17 and screwed into the nut 31.

The recess 16 and the mounting shaft 21 fitted therein are formed as a pair, and in the present embodiment, each is formed by four, but the number is not particularly limited.
It may be two at a time.

As shown in FIGS. 3 and 4, the terminal box P according to the present invention is attached to the back surface of the solar cell module 4 held by the frame member 42 by an appropriate method such as an adhesive or an adhesive. When mounting, it is preferable to set the thickness of the terminal box P so that the terminal box P does not project below the frame member 42 and the lower end is located inside the frame member 42.

The PG 9 suitable for the outside diameter of the output wire 5 normally used for connecting the solar cell module 4
Take out the cable gland (outer diameter about 20mm) 6
When the terminal box P is mounted on
mm. That is, even if the thickness of the entire terminal box P is set to 26 mm, the thickness of the bottom wall 12 of the box body 1 and the thickness of the lid member 2 are made thinner so that the total becomes 5.5 mm. Since the inner width of the terminal box P can be secured to 20.5 mm, the cable gland 6 having an outer diameter of about 20 mm can be sufficiently attached.

In this case, even if the thickness of the bottom wall 12 of the box main body 1 and the thickness of the lid member 2 are so thin, the tightening screw 3 for fixing the lid member 2 to the box main body 1 is not used. Is performed via the mounting shaft 21 of the lid member 2 and the concave portion 16 of the box body 1,
It can withstand the torque generated by screw tightening.

[0022]

According to the present invention, since the lid member is fixed to the box body by the fastening screw, the waterproofness is excellent. The tightening screw is inserted into a through hole of a mounting shaft protruding from the lid body and screwed into a screw hole of the box body. That is, the screw tightening torque is made to endure by the mounting shaft, and is not made to endure by the thickness of the lid member, so that the thickness of the lid member can be reduced. For this reason, the entire thickness of the terminal box can be reduced to prevent the terminal box from protruding from the frame material of the solar cell module, and the thickness of the lid member can be reduced to increase the inner width of the terminal box. Therefore, a cable gland can be attached.

Further, the mounting shaft is adapted to be fitted into a concave portion of the box main body, and the distal end portion is supported by the concave portion to improve the strength. Can withstand.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of FIG.

FIG. 3 is a perspective view showing a state where the terminal box according to the present invention is mounted on a solar cell module.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a perspective view showing a conventional terminal box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box main body 11 Side wall 12 Bottom wall 13 Intake hole 14 Extraction hole 15 Thick part 16 Depression 17 Screw hole 2 Lid member 21 Mounting shaft 22 Through hole 3 Tightening screw 4 Solar cell module 41 Output wire 42 Frame material 5 Output Take-out wire 6 Cable gland

Claims (2)

[Claims] An output hole attached to a solar cell module for receiving an output wire from the solar cell module, and an output hole for extracting an output extraction wire electrically connected to the output wire to the outside. A terminal box for a solar cell, comprising: a box body; and a lid member that covers the box body. The lid member is configured such that a fastening screw can be inserted into a mounting shaft protruding from a rear surface side. A through hole is drilled, and the box body is provided with a screw hole into which a fastening screw is screwed in a recess portion into which the mounting shaft is fitted, and a cover member is put on the box body, and the box body has a recess. The cover member is fixed to the box body by fitting the mounting shaft of the cover member into the portion and screwing the tightening screw inserted through the through hole of the mounting shaft into the screw hole of the recessed portion. Characteristic terminal box for solar cells. 2. The terminal box for a solar cell according to claim 1, wherein a cable gland is attached to an attachment hole formed in a side wall of the box main body for extracting an output extraction wire to the outside. .