JP6898178B2 - Terminal block - Google Patents

Description

The present invention relates to a terminal block in which a plurality of screw terminals are provided side by side in a terminal row.

Conventionally, for example, a power supply device, a power conversion device that converts the power of the power supply device, various devices that receive power from the power supply device and the power conversion device, a switchboard in a power plant, a control board, etc. For branch connection, a terminal board provided with a terminal row consisting of a plurality of screw terminals is attached.

For example, at the time of shipment of these various devices, shipping tests such as confirmation of normal operation in which a test power supply voltage is applied via a terminal block, confirmation of output voltage value, output current value, etc. are performed, performance evaluation, etc. Is being done. Generally, for example, as shown in Patent Document 1, a test jig is attached to a terminal block to perform a test, and the jig is removed and shipped after the test. ..

Japanese Unexamined Patent Publication No. 9-139244

However, since it is necessary to connect the wiring of the test power supply to the screw terminal or disconnect the wiring after the test, there is a problem that the work man-hours are required. In addition, when connecting or disconnecting the above test wiring, there is work to tighten or loosen the screw part of the screw terminal, and during that work, the screw hole of the screw part is crushed or the screw hole is in a clean state. There was a problem that it could not be tightened with sufficient strength to maintain.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal block capable of testing and evaluating a terminal block without loosening the threaded portion of the screw terminal.

In the first aspect of the present invention, in a terminal block in which a plurality of screw terminals are arranged side by side in a terminal block main body, the terminal block main body has a plurality of support portions for supporting the respective screw terminals. Each of the screw terminals has a conductive plate that is supported by a support portion of the terminal block main body and has a screw hole formed through the terminal block, and a screw portion that is screwed into the screw hole of the conductive plate to sandwich the terminal. In each of the support portions, at least one of both side surfaces located in the direction orthogonal to the terminal row direction is formed with a recessed portion that is recessed inward from the side end surface of the conductive plate, and the recessed portion in the conductive plate is formed. A contact portion for abutting the contactor of the inspection jig is provided on the side end surface on the portion side.

With such a configuration, the terminal block can be inspected by using, for example, an inspection jig in a form of sandwiching the terminal block in the orthogonal direction. That is, the terminal block can be inspected and evaluated without loosening or retightening the screw portion of the screw terminal.

The width of each recess in the terminal row direction may be narrower than the width of the conductive plate in the terminal row direction.

As a result, regardless of the depth of the recessed portion in the orthogonal direction, a support structure for supporting the conductive plate from below can be provided on both outer sides of the recessed portion in the terminal row direction.

The recessed portion is formed on one side surface of each of the support portions, and the terminal block body has a contactor and a pressing portion that come into contact with the contact portion on the other side surface side of the support portion. There may be a receiving surface on which the pressing portion of the inspection jig that sandwiches the terminal block from both sides in the orthogonal direction is pressed.

As a result, the sandwich type inspection jig can be stably attached.

In the second aspect of the present invention, in a terminal block in which a plurality of screw terminals are arranged side by side in a terminal block main body, each screw terminal is supported by the terminal block main body and a screw hole penetrates therethrough. It is composed of a formed conductive plate and a screw portion screwed into a screw hole of the conductive plate to sandwich a terminal, and on at least one side end surface in a direction orthogonal to the terminal row direction of the conductive plate, A contact portion for abutting the contacts of the inspection jig is provided, and the terminal block main body is provided with the contact portion of the contact in a state where the contact is in contact with the contact portion. It is characterized in that a relief structure is provided to allow the non-contact portion to escape.

Thereby, as in the first aspect, the terminal block can be inspected by using, for example, an inspection jig in a form of sandwiching and inspecting in a direction orthogonal to the terminal row direction.

According to the present invention, it is possible to provide a terminal block capable of testing and evaluating a terminal block without loosening the threaded portion of the screw terminal.

It is a front view which shows the schematic structure of the terminal block. It is a top view which shows the schematic structure of a terminal block. It is an enlarged plan view which expanded the region shown by III of FIG. It is the enlarged perspective view which showed the part of the terminal block enlarged. It is a front view which shows the state which attached the inspection jig to the terminal block. It is a side view which shows the state which attached the inspection jig to the terminal block. It is a side view which shows the state which the other inspection jig is attached to the terminal block.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the present invention, its applications or its uses.

FIG. 1 is a side view showing a schematic configuration of a terminal block according to the present embodiment, and FIG. 2 is a plan view of the same. In the present embodiment, a configuration example of the self-up type terminal block 1 will be shown and specifically described.

The terminal block 1 is attached as an input / output port to, for example, an electric device such as a power conversion device such as a power conditioner, and various devices such as various power generation systems and a power supply device such as a storage battery (hereinafter, simply referred to as a device). It is used for relay connection and branch connection of various wiring. Further, as described in the background technology, the terminal block 1 is also used in electric power equipment, a switchboard in a power plant, a control panel, and the like.

The mounting surface side (back side in the mounting direction) when the terminal block 1 is mounted on a device or the like is referred to as "bottom", and the front side in the mounting direction is referred to as "top". That is, the mounting direction when the terminal block 1 is mounted on a device, various devices, or the like is referred to as a "vertical direction".

The terminal block 1 has a terminal block main body 10, and the terminal block main body 10 is provided with a terminal row 2 composed of a plurality of screw terminals 20. In the following description, the direction along the terminal row 2 (terminal row direction) is referred to as "left-right direction". Further, the direction orthogonal to the vertical direction and the horizontal direction is referred to as "front-back direction", and the back plate side described later in the front-back direction is referred to as "rear" and the opposite side is referred to as "front". In other words, the front-back direction corresponds to the orthogonal direction orthogonal to the terminal row direction.

The terminal block main body 10 has a rectangular box-shaped base portion 11. On the base portion 11, a plurality of side plates 12 are erected between both ends in the left-right direction at intervals corresponding to the width of the screw terminals 20 in the left-right direction and so as to face each other. The rear ends of the plurality of side plates 12 are flush with the rear ends of the base portion 11. The rear ends of the plurality of side plates 12 are connected by a back plate 13. As a result, the terminal accommodating space R for accommodating each screw terminal 20 is partitioned by the pair of adjacent side plates 12 and the back plate 13. The base portion 11, the side plate 12, and the back plate 13 of the terminal block main body 10 are made of, for example, an insulating resin. Further, the upper ends of the plurality of side plates 12 are flush with each other, and on the upper side of the side plates 12 and the back plate 13, a cover 15 is provided so as to cover the upper side of the terminal accommodating space R (indicated by virtual lines in FIGS. 1 and 2). ) Is provided.

Further, at the lower corners of the base portion 11 at both left and right ends, a pair of screwed portions 16 for screwing and fixing the terminal block 1 to a device or the like are provided from the left and right outer surfaces of the corners to the left and right. It is integrally projected toward the outside in the direction. Further, on the lower end surface 11a of the base portion 11, as many electrode plates 17 as the number of screw terminals 20 are projected downward at positions corresponding to the screw terminals 20. The electrode plate 17 is electrically connected to the corresponding screw terminal 20, respectively.

Each terminal accommodating space R of the terminal block main body 10 is provided with a support portion 14 for supporting the screw terminal 20 at an intermediate height position in the vertical direction of the side plate 12. The screw terminal 20 is screwed into a conductive plate 21 supported on the upper surface of the support portion 14 (hereinafter referred to as a support surface 14a) and a screw hole (not shown) of the conductive plate 21 and is a terminal for external wiring (not shown). It is composed of a screw portion 22 for sandwiching the above.

The conductive plate 21 is a conductive plate-like body, and the screw hole is formed through the central portion thereof. Further, the four corners of the conductive plate 21 in the front-rear and left-right directions are formed by bending from both outer sides in the left-right direction toward the lower side, and locking portions 25 for supporting the conductive plate 21 on the support portion 14 (see FIG. 3). Is provided.

The threaded portion 22 includes a male threaded portion 23 composed of a head portion 23a (see FIG. 6) having a driver groove formed in the center of the upper side and a shaft portion 23b (see FIG. 6) extending downward from the lower surface of the head portion. A washer 24 that is inserted into the shaft portion 23b of the male screw portion 23 and sandwiches the terminal of the external wiring between the male screw portion 23 and the conductive plate 21 when the male screw portion 23 is screwed into the conductive plate 21. The washer 24 may be provided separately from the male screw portion 23, or may be integrally formed with the male screw portion 23. Further, when the external wiring terminal can be held only by the male screw portion 23, the washer 24 may be omitted.

Each support portion 14 is integrally molded with the base portion 11, the side plates 12 on both outer sides of the terminal accommodating space R, and the back plate 13. Further, the height positions of the adjacent support portions 14 are aligned. Then, as shown in FIG. 6, each support portion 14 has a bottomed screw insertion portion 14b that is recessed downward from the support surface 14a at a position corresponding to the screw hole of the conductive plate 21. .. The screw insertion portion 14b is shaped so that, for example, the shaft portion 23b of the male screw portion 23 can be screwed in, or the shaft portion 23b can be inserted with play in the circumferential direction. Further, bottomed locked portions 14c that are recessed downward from the support surface 14a are formed at the four corners of the support portion 14 in the front-rear and left-right directions (see FIG. 3). The locking portion 25 of the conductive plate 21 is fitted into the locked portion 14c to prevent the conductive plate 21 from moving in the front-rear and left-right directions. In each drawing of the present embodiment, an example is shown in which the front end surface 14d of the support portion 14 is configured to be on the rear side of the front end surface 12a of the side plate 12, but the present invention is not limited to this. For example, the front end surface 14d of the support portion 14 and the front end surface 12a of the side plate 12 may be flush with each other.

The front end surface 14d of the support portion 14 is formed with a recessed portion 14e that is recessed below the support surface 14a and inward of the front end surface 21b of the conductive plate 21. The width of the recessed portion 14e in the left-right direction is wider than the width of the contactor 42 (contact piece portion 42c) of the clamp jig 4 as an inspection jig, which will be described later with reference to FIGS. There is. Further, in the recessed portion 14e, the height position of the lower surface of the recessed portion 14e is lower than the lower end of the contact piece portion 42c of the contactor 42 in a state where the terminal block 1 is sandwiched in the front-rear direction by the clamp jig 4. It is formed. As a result, when the terminal block 1 is clamped in the front-rear direction by the clamp jig 4, it is possible to avoid the collision of the contact piece portion 42c with the support portion 14, and the contact provided on the front end surface 21b of the conductive plate 21 can be avoided. The contact piece portion 42c can be brought into contact with the contact portion 21c.

Here, the front end surface 21b of the conductive plate 21 corresponds to the side end surface in the orthogonal direction (front-back direction) orthogonal to the terminal row direction (left-right direction). Then, in the front end surface 21b of the conductive plate 21, the portion corresponding to the recessed portion 14e, that is, the portion where the contact piece portion 42c of the clamp jig 4 may come into contact is referred to as the contact portion 21c. To do. Further, the recessed portion 14e corresponds to a collision avoidance structure for preventing the contactor 42 (contact piece portion 42c) of the clamp jig 4 described later from colliding with a portion other than the contact portion 21c of the terminal block 1. At the same time, it corresponds to a relief structure for releasing the ridge 42f provided on the contact piece portion 42c, which will be described later, in a state where the contact piece portion 42c is in contact with the contact portion 21c.

5 and 6 show a state in which the clamp jig 4 as an inspection jig is attached to the terminal block 1, FIG. 5 is a front view, and FIG. 6 is a side view.

The clamp jig 4 has a jig main body 41 having a built-in air cylinder (not shown), and is brought into contact with the contact portion 21c of the conductive plate 21 when the operating force from the air cylinder is released. The contactor 42 and the pressing portion 43 pressed against the rear surface of the back plate 13 sandwich the terminal block 1 from both sides in the front-rear direction so that various inspections can be performed. Further, the clamp jig 4 is provided with a connecting portion 44 for connecting a high-voltage line cable 6 connected to an inspection power supply device (not shown) that supplies an applied voltage required for a withstand voltage test.

The pressing portion 43 has a function of being pressed during the above-mentioned sandwiching and a function of positioning the terminal block 1 and the clamp jig 4. Specifically, the front lower corner portion of the pressing portion 43 is cut out in a stepped shape according to the shape of the rear upper corner portion of the terminal block 1. Then, when the clamp jig 4 is attached to the terminal block 1, positioning can be performed by applying the rear upper corner portion of the terminal block 1 to the stepped portion. Further, in this positioned state, the terminal block 1 is sandwiched in a state where the rear surface 13a (corresponding to the receiving surface) of the back plate 13 is pressed against the pressing portion 43. The table 1 can be stably held.

The contacts 42 are lever-type contacts formed in a substantially L-shape, and are arranged side by side in the left-right direction. Further, each contactor 42 is attached and fixed to a support shaft 41b extending in the left-right direction over the entire terminal block 1 at a position corresponding to the screw terminal 20 to be contacted. More specifically, each contact 42 is a contact that extends downward from a fixed position to the support shaft 41b in a mounted state (see the solid line in FIG. 6) in which the clamp jig 4 is mounted on the terminal block 1. It includes a single portion 42c and an operating piece portion 42b extending in a substantially L shape from a fixed position to the support shaft 41b toward the upper side and the rear side.

On the rear surface of the lower end portion of the contact piece portion 42c, a ridge 42f is formed at a height lower than the lower surface of the conductive plate 21 so as to project in a substantially triangular shape toward the rear side and extend in the entire left-right direction. There is. As a result, when the terminal block 1 is sandwiched between the contactor 42 and the pressing portion 43, the rear surface of the contact piece portion 42c is brought into contact with the abutting portion 21c of the conductive plate 21, and is clamped by the ridge 42f. The jig 4 can be prevented from coming off so as not to come off upward. In other words, the recessed portion 14e is recessed inward from the front end surface 21b of the conductive plate 21, thereby realizing a retaining structure for the clamp jig 4.

On the upper side of the operating piece portion 42b at the intermediate position in the front-rear direction, an operating shaft 41a for pushing down the upper surface of the operating piece portion 42b downward by receiving a downward operating force by the air cylinder is provided in the left-right direction. It has been handed over. Further, a spring mounting portion 42g for mounting a spring (not shown) for urging the working piece portion 42b upward is provided on the lower surface of each working piece portion 42b on the rear end side. The urging force of the spring attached to the spring attachment portion 42g is not particularly limited, but is set to, for example, about 50 [N]. As a result, the contactor 42 can be attached and detached by the air cylinder. Specifically, in the contact 42, in the steady state in which the operating force of the air cylinder is released, the operating piece portion 42b is in a horizontal state due to the urging force of the spring, and the rear end surface of the contact piece portion 42c is in contact with the conductive plate 21. It is located at the mounting position (see the solid line in FIG. 6) that comes into contact with the contact portion 21c. On the other hand, when an operating force that opposes the urging force of the spring is applied from the air cylinder, the operating piece portion 42b is pushed down, and the contactor 42 is separated from the mounting position with the support shaft 41b as a fulcrum (see the broken line in FIG. 6). ).

As an inspection using the clamp jig 4, for example, an inspection of a contact resistance value, an inspection of a temperature rise when a predetermined electric power is applied, and the like are performed. Hereinafter, the inspection method using the clamp jig 4 will be specifically described.

First, the operator connects the high-voltage line cable 6 connected to the inspection power supply device (not shown) to the connection portion 44, and then exerts the operating force of the air cylinder to rotate the contactor 42 from the mounting position to the detaching position. Let me. After that, with the contactor 42 in the detached position, the terminal block 1 is pressed against the pressing portion 43 of the clamp jig 4 for positioning, and the operating force of the air cylinder is released. As a result, the contactor 42 rotates from the detached position to the mounting position, and the contact piece portion 42c is brought into contact with the contacting portion 21c of the conductive plate 21, that is, the mounting state is established.

In this mounted state, for example, in the inspection of the contact resistance value, the terminal block 1 is energized by applying a predetermined voltage to the terminal block 1 from the power supply device for inspection and before energizing the terminal block 1 via the high-voltage line cable 6 and the connection portion 44. Later, the contact resistance of the connection portion 44 and the electrode plate 17 is measured. Further, for example, in the temperature rise inspection, a predetermined power is applied to the terminal block 1 from the inspection power supply device in the same manner as described above, and the temperature rise of the contact piece portion 42c is measured by using a thermoelectric pair or the like.

When the necessary inspection is completed, the operator exerts the operating force of the air cylinder to rotate the contactor 42 from the mounting position to the detaching position, removes the clamp jig 4 from the terminal block 1, and finishes the work. ..

As described above, according to the present embodiment, the front end surface 14d of the support portion 14 is provided with the recessed portion 14e which is recessed below the support surface 14a and inward of the front end surface 21b of the conductive plate 21. , The terminal block 1 can be sandwiched in the front-rear direction by using the clamp jig 4 for inspection. That is, the terminal block 1 can be inspected and evaluated without loosening or retightening the screw portion 22 of the screw terminal 20. Further, since there is no work of loosening or retightening the screw portion 22, the screw hole of the screw portion is not crushed during the work.

For example, in the case of the terminal block 1 in which the recessed portion 14e (collision avoidance structure) is not provided, even if the terminal block 1 is sandwiched by the clamp jig 4 from the front-rear direction as in the present application, the support portion 14 becomes an obstacle and clamps. It is difficult to bring the jig 4 into stable contact with the conductive plate 21. Further, if a relatively large current for inspection is passed in a state where such stable contact is not made, black soot adheres to the screw terminal 20 or the screw terminal 20 is discolored due to electric discharge or the like, and the product is manufactured. It may not be possible to ship, but this is not the case in the present application.

<Other Embodiments>
Although the preferred embodiment of the present invention and its modification have been described above, the technique according to the present disclosure is not limited to this, and can be applied to an embodiment in which modifications, replacements, etc. are appropriately performed. Further, it is also possible to combine the components described in the above embodiment and the components described below to form a new embodiment.

For example, in the above embodiment, it is assumed that the lower end portion of the contact piece portion 42c is provided with the protrusion 42f for preventing the protrusion, but as shown in FIG. 7, the clamp jig 4 without the protrusion is provided. May be used. Even when such a clamp jig 4 is used, the mounting method and the inspection method of the clamp jig 4 are the same as those in the above embodiment, and the same effect can be obtained.

Further, in the above embodiment, when the contact piece portion 42c of the contactor 42 of the clamp jig 4 comes into contact with the contact portion 21c, the contact piece portion 42c is prevented from colliding with other than the contact portion 21c. An example of providing a recessed portion 14e in the support portion 14 as an avoidance structure and a relief structure for releasing the ridge 42f provided on the contact piece portion 42c in a state where the contact piece portion 42c is in contact with the contact portion 21c has been described. .. However, the collision avoidance structure / relief structure is not limited to the above-described embodiment, and may be another configuration having each of the above-mentioned functions.

Further, FIG. 1 shows an example in which the periphery of the shaft portion 23b is covered with a part of the support portion 14, but the present invention is not limited to this. Although specific illustration is omitted, the depth of the recessed portion 14e in the front-rear direction may be further increased in FIG. 1 to expose the shaft portion 23b of the male screw portion 23.

Further, in the above embodiment, the conductive plate 21 is supported by the support surface 14a of the support portion 14, but the present invention is not limited to this. For example, the conductive plate 21 may be supported by using a position other than the support surface 14a of the support portion 14 or a part of the side wall 12. More specifically, a protrusion or the like may be provided on the support portion 14 so as to project upward, and the conductive plate 21 may be supported by the protrusion. Further, the shape of the locked portion 14c may be tapered downward, and the locking portion 25 may be supported by the inner wall of the locked portion 14c. Further, as the conductive plate 21, a conductor having a gentle inverted U shape in front view may be applied, and even in such a case, the conductive plate is formed on the support surface 14a or other parts based on the above description. 21 may be supported.

Further, in the above embodiment, the pressing portion 43 of the clamp jig 4 is pressed against the rear surface 13a of the back plate 13, but the present invention is not limited to this. For example, when two rows of terminal rows 2 are provided in parallel, since there is no back plate 13, a receiving surface is formed on the rear surface (not shown) of the base portion 11 and the pressing portion 43 is pressed against the receiving surface. You may be able to do it. Further, the terminal block 1 may not be provided with a receiving surface. In this case, for example, a receiving surface may be provided on a part of the device to which the terminal block 1 is attached, and the pressing portion 43 may be pressed against the receiving surface.

Further, in the above embodiment, the configuration of the self-up type terminal block has been described as an example, but the technique according to the present invention can also be applied to the screw-up type terminal block. Specifically, also in the screw-up type terminal block, as in the configuration of FIG. 1, a recessed portion is provided in the support portion that supports the conductive plate, and a collision avoidance structure (including a relief structure) is provided with respect to the terminal block main body. ) May be provided.

The present invention is useful as a terminal block in which a plurality of screw terminals are provided side by side in a terminal row.

1 Terminal block 10 Terminal block body 14 Support part 14e Recessed part 20 Screw terminal 21 Conductive plate 21c Contact part 22 Threaded part

Claims (3)

A terminal block in which a plurality of screw terminals are arranged side by side in a terminal block body.
The terminal block main body has a plurality of support portions for supporting each of the screw terminals.
Each of the screw terminals comprises a conductive plate supported by a support portion of the terminal block main body and having a screw hole formed through the conductive plate, and a screw portion screwed into the screw hole of the conductive plate to sandwich the terminal.
In each of the support portions, a recessed portion that is recessed inward from the side end surface of the conductive plate is formed on at least one of both side surfaces located in an orthogonal direction orthogonal to the terminal row direction.
A contact portion for contacting the contactor of the inspection jig is provided on the side end surface of the conductive plate on the recessed portion side .
The recessed portion is recessed inward from the abutting portion on the back side of the conductive plate in the mounting direction of the screw terminal, and when the contactor abuts on the abutting portion, the lower end of the contacting portion. A terminal block characterized by having a space formed so that a part can be inserted. In the terminal block according to claim 1,
A terminal block characterized in that the width of each recessed portion in the terminal row direction is narrower than the width of the conductive plate in the terminal row direction. In the terminal block according to claim 1,
The recessed portion is formed on one side surface of each of the support portions.
On the other side surface side of the support portion, the terminal block body is pressed by an inspection jig that sandwiches the terminal block from both sides in the orthogonal direction by a contactor and a pressing portion that are in contact with the contact portion. A terminal block characterized by being provided with a receiving surface on which the contact portion is pressed.

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