JP5484852B2 - Screw terminal structure and electromagnetic relay having the structure - Google Patents

Description

  The present invention relates to a screw terminal structure having a screw connection and a wiring connection receiving portion to which a screw terminal is connected, and an electromagnetic relay having the screw terminal structure.

  Conventionally, in an electronic component such as an electromagnetic relay, a switch, or an electromagnetic contactor having this type of screw terminal structure, heat generated by energization through the screw terminal is effectively dissipated by the internal structure. Various things have been proposed (see, for example, Patent Document 1).

  In Patent Document 1, a plurality of relay sockets are arranged inside a body (base) on which a terminal block (wiring connection receiving portion) is formed with a predetermined gap instead of being in close contact with the gap. The heat dissipation of the relay is increased by providing a partition wall.

JP 10-289742 A

  However, when the technology of Patent Document 1 is adopted for an electromagnetic relay or the like, it is necessary to develop a new product in which the internal structure of the body is redesigned. Therefore, an enormous development cost is required only for improving heat dissipation. In addition, since the products with low heat dissipation that have been used in the past are naturally not used, the cost may increase. Therefore, such a new product cannot be easily implemented.

  In addition, since the amount of heat dissipation is generally determined by the current value of the current flowing to the electronic component, the conventional product may be able to cope with the current depending on the current flowing. For this reason, it is necessary to change the design and develop a new product. In addition, there is a demand for selectively adding other members to the conventional product so as to cope with a large current.

  That is, for example, in the conventional electromagnetic relay 100 shown in FIG. 5, a recess 102 is formed in a body 101, and a wiring connection receiving portion 103 made of a copper plate or the like connected to a relay contact is formed at the bottom of the recess 102. The screw terminal structure (not shown) is fixed to the wiring connection receiving portion 103 with the screw 104, and the screw terminal structure having the wiring connection receiving portion 103 formed in the recess 102 is provided. It is preferable from the viewpoint of cost that the above can be used as it is.

  The present invention has been proposed in view of such circumstances, and its purpose is to add a member with a simple structure to a conventional product without greatly changing the internal / external structure of the base including the wiring connection receiving portion. It is an object of the present invention to provide a screw terminal structure that can improve heat dissipation and an electromagnetic relay having the structure.

  The electromagnetic relay 100 shown in FIG. 5 has a plurality of wiring connection receiving portions 103 corresponding to a plurality of screw terminals provided in the concave portion 102 of the body 101. The screw terminals connected to the connection receiving portion 103 are limited in size, and therefore large screw terminals cannot be connected.

  That is, even if the internal structure of the body is modified so that it can withstand a large current as in the technique described in the above document, a large screw terminal cannot be attached in the first place. Therefore, there is almost no need for a structure that increases heat dissipation.

  The present invention also takes such circumstances into consideration, so that it is possible to energize a large current by adding other members, and to withstand an increased heat radiation amount that matches the large current. The purpose is to make it.

In order to achieve the above object, the screw terminal structure according to claim 1 is formed on the base, and the terminal plate is connected to the wiring connection receiving portion having a screw hole, and the screw connected to the terminal plate by wiring. The terminal is screw-fixed, and the terminal plate is connected to the main body terminal connecting portion having a mounting hole for attaching to the wiring connection receiving portion with a screw, and extends from the main body terminal connecting portion to the side of the base. The extension terminal connection portion having the insertion hole is electrically connected , and the extension terminal connection portion is formed to be larger in plan dimension and thickness dimension than the main body terminal connection portion. Features.

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The screw terminal structure according to claim 2 has a structure in which a plurality of wiring connection receiving portions are formed on the base so that a plurality of terminal plates can be connected, and the extended terminal connecting portions of the plurality of terminal plates are connected to each other. The cover body which covers separately is protrudingly provided from the base.

The electromagnetic relay according to claim 3 has the screw terminal structure according to claim 1 or 2 .

  According to the screw terminal structure of the first aspect, since the terminal plate protruding to the side of the base is connected to the wiring connection receiving portion, the heat dissipation can be improved by the terminal plate. Since it is a structure which only adds a terminal board, there is almost no need to modify the internal / external structure of the base of a conventional product, and it can implement simply.

  Furthermore, since the terminal board has a main body terminal connection part connected to the wiring connection receiving part and an extended terminal connection part arranged on the side of the base, two types of wiring connection are possible and convenience In addition, since the extension terminal connection portion is arranged in a space where there is no partition wall or the like, the extension terminal connection portion can be connected to a screw terminal having a high allowable current value and a larger size. .

In addition, since the extension terminal connection part is formed to be larger in size than the main body terminal connection part, the extension terminal connection part can be used specifically for connecting large screw terminals, thereby exceeding the rating. A large current can be applied to an electronic component such as a relay. In addition, since the extended terminal connecting portion has a large size, it can cope with a large heat radiation amount corresponding to a large screw terminal.

According to the screw terminal structure of the second aspect , since the extended terminal connecting portions of the plurality of terminal plates are individually covered with the cover body, the extended terminal connecting portions arranged on the side of the base are provided. In addition to preventing contact with other objects, insulation can also be achieved.

According to the electromagnetic relay of the third aspect, since it has the screw terminal structure according to the first or second aspect, it can be used as an electromagnetic relay excellent in heat dissipation that can be easily implemented.

It is a partial exploded perspective view of the electromagnetic relay which shows one Embodiment of the screw terminal structure of this invention. It is the top view of the same electromagnetic relay, (a) is the state which attached the screw terminal, (b) is the figure which showed the state which removed the screw, the screw terminal, and the terminal board. It is a perspective view of the electromagnetic relay which shows other embodiment of the screw terminal structure of this invention. It is a perspective view which shows the internal structure of the electromagnetic relay of this invention. It is a perspective view of the electromagnetic relay provided with the conventional screw terminal structure.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 are explanatory views of an electromagnetic relay showing an embodiment of a screw terminal structure according to the present invention. FIG. 1 is a partially exploded perspective view showing a disassembled portion of a screw terminal structure of the electromagnetic relay. FIG. 2 is a plan view of the electromagnetic relay, FIG. 2 (a) is a view showing a state where screw terminals are attached, and FIG. 2 (b) is a view showing a state where screws, screw terminals and terminal plates are removed. .

  The electromagnetic relay 1 is formed by housing an electromagnetic relay main body in a casing made of a synthetic resin insulating body 2 and an insulating cover 3. The insulating body 2 is used as a base 10 and its outer surface (in FIG. 1). In the recess 2a formed in the upper part, there are a wiring connection receiving part 11 for wiring connection to the relay contact terminal and a wiring connection receiving part 7 (see FIG. 2) for wiring connection to the coil terminal (not shown). Two are formed. The structure of the relay body such as the relay contact terminal will be described later with reference to FIG.

  The wiring connection receiving portion 11 for connecting the relay contact terminal has a hole formed in the bottom of the recess 2a, and a copper plate 11a in which a female screw portion is formed is electrically connected and fixed to the relay contact terminal. Thus, the screw hole 11b is formed, and the crimped screw terminals 21 and 22 connected to the wiring are fixed to the screw hole 11b with screws and electrically connected to the relay contact terminal. In addition, the wiring connection receiving part 7 for coil terminals also has the same structure.

  In addition, the contact terminal wiring connection receiving portion 11 has a washer 14 on the end portion of the terminal plate 12 that is bent as shown in FIG. The crimp screw terminal 21 is sandwiched between the screw 13 and the screw 13 so as to be fixed.

  As shown in FIG. 2, these terminal boards 12 have a bent L-shape and an inverted L-shape in plan view. One end of each terminal board 12 is threaded through a screw 13 and the wiring connection receiving portion 11 of the base 10. A main body terminal connection portion 12a having a mounting hole 12aa for fixing to the screw is provided, and an extension terminal connection portion 12b having a screw insertion hole 12ba is provided at the other end. In a state where the main body terminal connection portion 12 a is screwed into the screw hole 11 b of the wiring connection receiving portion 11 of the base 10, the extended terminal connection portion 12 b is arranged so as to protrude to the side of the base 10.

  Each of the main body terminal connection portion 12a and the extension terminal connection portion 12b has a configuration in which the crimp screw terminals 21 and 22 can be electrically connected to the wiring connection receiving portion 11 by screws 13 and 15 and washers 14 and 16, respectively. About the extension terminal connection part 12b, the crimping screw terminals 21 and 22 can be fixed by screwing with the screw 15 with the nut 17 arranged below the screw insertion hole 12ba. Note that a female screw may be formed in the screw insertion hole 12ba so that the screw can be fixed.

Moreover, as shown in the figure, the main body terminal connecting portion 12a and the extended terminal connecting portion 12b are dimensionally different. That is, the extension terminal connection portion 12b has a plane (width) dimension, a thickness dimension, and a screw insertion hole 12ba that are larger than the main body terminal connection portion 12a, and there is no side wall like the recess 2a. A large-diameter crimp screw terminal 22 is attached to the portion 12b with a screw 15 having a large diameter at both the screw head and the shaft portion.

  That is, a large-diameter crimp screw terminal 21 that cannot be dimensionally connected to the main body terminal connection portion 12a can be connected to the extension terminal connection portion 12b. Thus, since the crimp screw terminal 21 has a current value that is usually determined depending on its size, the extension terminal connection portion 12b is supplied with a larger current than when connected to the main body terminal connection portion 12a. Can do.

  One of these two types of terminal connection portions may be selectively used. When a normal current is applied, the main body terminal connection portion 12a is used. On the other hand, when a current exceeding the rating is applied, A large crimp screw terminal 22 that can be energized with a large current may be connected to the extended terminal connecting portion 12b.

  Thus, since it is the structure which can selectively connect two types of crimp screw terminals 21 and 22 according to an electric current value, a large electric current beyond a rating can be supplied to a relay contact by switching a connection mode. .

  In addition, since the terminal plate 12 has a structure in which the extended terminal connecting portion 12b protrudes to the side of the base 10, since the periphery of the protruding portion is open, the amount of heat radiation is increased and the heat dissipation is improved. In particular, in the illustrated example, the extension terminal connection portion 12b is dimensionally larger than the main body terminal connection portion 12a, so that the heat radiation corresponding to the current value passed through the extension terminal connection portion 12b can be diverged. Can do.

  In addition, since the extension terminal connection part 12b is the structure which protruded to the side of the base 10, and the circumference | surroundings were open | released, the dimension of the extension terminal connection part 12b is equal to or smaller than the main body terminal connection part 12a However, improvement in heat dissipation when energized can be expected.

  Further, since the screw terminal structure of the electromagnetic relay 1 is a structure in which the terminal plate 12 is simply added to the base 10, for example, the conventional product as shown in FIG. And can be implemented easily.

  FIG. 3 is a perspective view of an electromagnetic relay showing another embodiment of the screw terminal structure of the present invention.

  As in the electromagnetic relay 1 shown in FIG. 1, the electromagnetic relay 1 has an L-shape in plan view on each of two wiring connection receiving portions 11 (not shown in the figure, see FIG. 1) formed on the base 10. Further, a cover body 18 that individually covers the extended terminal connection portions 12b of the terminal plates 12 is provided so as to protrude from the base 10. .

  The cover body 18 is made of a synthetic resin, and includes a partition plate 18a that separates the extended terminal connection portions 12b, and a ceiling plate 18b and a bottom plate 18c that cover the extended terminal connection portions in plan view and bottom view. And is fixed to the base 10. In order to facilitate the connection work of the crimp screw terminal 22 to the extended terminal connection portion 12b, the crimp screw terminal 22 (not shown in this figure, see FIG. 1) is connected to the base 10 side after wiring connection. It is desirable to have a structure that can be fitted to the part.

  As described above, since the electromagnetic relay 1 is provided with the cover body 18 that covers the extended terminal connection portion 12b of the terminal plate 12, the terminal plate 12 comes into contact with other objects during the installation work or the like and is damaged. Can be prevented. Further, since the extended terminal connecting portions 12b are individually covered, insulation can be achieved.

  Next, the internal structure of the electromagnetic relay 1 of the present invention will be described.

  4 is a rear perspective view of the electromagnetic relay 1 shown in FIG. 1 with the insulating cover 3 removed.

  The electromagnetic relay 1 has an electromagnet part 4 in which a coil 4b is wound around a coil bobbin 4a, and an iron core 4c is fitted in a through hole (not shown) of the coil bobbin 4a, and is driven by the electromagnet part 4 to open and close. Two pairs of contact pairs 6 each including a fixed contact 6b and a movable contact 6a are provided in the insulating body 2 so as to be separated from each other.

  When the electromagnet portion 4 is excited, the movable contacts 6a operate the armature 5 by the attractive force of the iron core 4c, and the movable contacts 6a come into contact with the respective fixed contacts 6b facing each other. Is closed. On the other hand, when not energized, the movable contact 6a and the fixed contact 6b are separated from each other, and the two fixed contacts 6b are separated from each other in the insulating body 2, so that they are insulated from each other. .

  Note that the wiring connection receiving portion 11 (see FIG. 1 and the like) described in the above two embodiments is connected to the relay contact terminals 8a and 8b to which the fixed contact 6b and the movable contact 6a are respectively connected in the lower concave portion 2a. The extension terminal connection portion 12b of the terminal plate 12 is formed on the contact pair 6 side of the insulating body 2 (base 10). It protrudes on the side of the outer wall.

  In the above two embodiments, the electromagnetic relay is exemplified as the electronic component having the screw terminal wiring connection structure, but it goes without saying that the electronic relay can be applied to other electronic components such as a switch and an electromagnetic contactor.

  Further, the screw terminal wiring connection structure to which the terminal plate is added is also applicable to the coil terminal wiring connection receiving portion 7 (see FIG. 1 and the like) in the above-described electromagnetic relay embodiment. In that case, it is needless to say that the electromagnet portion 4 (see FIG. 3) needs a configuration that can accept a large current corresponding to the crimp screw terminal 22 (see FIG. 1 and the like) having a large diameter.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Insulating body 2a Recessed part 3 Insulating cover 7 Wiring connection receiving part for coil terminals 10 Base 11 Wiring connection receiving part 11a Copper plate 11b Screw hole 12 Terminal board 12a Body terminal connecting part 12aa Mounting hole 12b Extension terminal connecting part 12ba Screw insertion hole 13 Screw (for main unit terminal connection)
14 Washer (for main unit terminal connection)
15 Screw (for extension terminal connection)
16 Washer (For extension terminal connection)
17 Nut (for extension terminal connection)
18 Cover body 21 Crimp screw terminal (for main unit terminal connection)
22 Crimp screw terminal (for extension terminal connection)

Claims (3)

The terminal board is connected to the wiring connection receiving portion having a screw hole formed on the base, and the screw terminal connected to the wiring is screwed to the terminal board.
The terminal plate has a main body terminal connecting portion having an attachment hole for attaching to the wiring connection receiving portion with a screw, and extends from the main body terminal connecting portion to the side of the base, and has a screw insertion hole. It has a structure in which the extension terminal connection is electrically connected ,
The screw terminal structure, wherein the extension terminal connection portion is formed larger in plan dimension and thickness dimension than the main body terminal connection portion . In claim 1,
A plurality of wiring connection receiving portions are formed on the base, and a plurality of terminal boards can be connected.
The screw terminal structure in which the cover body which covers the extended terminal connection part of a some terminal board separately protrudes from the said base . An electromagnetic relay having the screw terminal structure according to claim 1.

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