JP5065946B2 - Screw type terminal block and terminal box structure - Google Patents

Description

  The present invention relates to a screw type terminal block and a structure of a terminal box that accommodates the terminal block.

  As a configuration for connecting a power supply cable (power supply cable) to a device (power receiving device) that requires power such as a motor or a heater, a screw-type terminal block is frequently used. In general, a screw-type terminal block includes a screw-type power supply terminal to which a power-supply cable is connected on a conductive plate, and a screw-type power-receiving terminal to which a power-receiving cable (a power cable toward a power receiving device) is connected. .

  Since the power feeding terminal and the power receiving terminal are electrically connected via the conductive plate, the power feeding cable and the power receiving cable are electrically connected by the function of the terminal block, and the power to the power receiving device or the like is eventually obtained. It will be possible to supply.

  In the conventional screw-type terminal block, the conductive plate is a so-called “flat plate”, and the power feeding terminal and the power receiving terminal are arranged side by side on the same plane. Therefore, if the power feeding cable and the power receiving cable are connected to the respective terminals from the same side, the cables interfere with each other in space, so that both cables are opposed and butted from opposite directions by 180 degrees. In this manner, the connection is made to each terminal.

  However, it is not always convenient to connect the power supply cable and the power reception cable in a manner in which the power supply cable and the power reception cable are always abutted from opposite directions of 180 degrees. In particular, such a screw type terminal block is accommodated in the terminal box. When used, etc., there are cases where it is easier to handle both cables by approaching each terminal from the same side.

  In view of such a point, for example, in Patent Document 1, a step is provided in the arrangement of the power feeding terminal and the power receiving terminal, and each cable interferes even when the power feeding cable and the power receiving cable are connected from the same side. A screw-type terminal block is disclosed that eliminates the need to cause the trouble.

Japanese Patent Laid-Open No. 11-121063

  However, in the conventional screw-type terminal block including the technique disclosed in Patent Document 1, the guide surface of the conductive plate in the vicinity of the feeding terminal is parallel to the terminal block mounting surface of the power receiving device. Was attached. Therefore, there is a problem that it may be difficult to connect the power supply cable to the power supply terminal, particularly when the screw type terminal block is attached to the power receiving device in a state of being housed in the terminal box. It was.

  The present invention has been made to solve such conventional problems, and in particular, a user of a power receiving device simply connects a power supply cable provided in his / her factory or the like to the power receiving device. It is an object of the present invention to provide a screw-type terminal block that can be used or a terminal box structure that accommodates the screw-type terminal block.

The present invention includes a screw type power supply terminal to which a power supply cable is connected and a screw type power reception terminal to which a power reception cable is connected on a conductive plate, and a screw capable of supplying power to the power receiving device side. In the terminal block of the type, a power supply guide surface that is formed by a conductive plate in the vicinity of the power supply terminal and that faces the power supply terminal from the side where the power supply cable is inserted with respect to the power supply terminal is a terminal block mounting surface of the power receiving device The power receiving guide is attached to the power receiving device so as to be inclined in a direction approaching the power receiving device, and is formed by a conductive plate in the vicinity of the power receiving terminal and is directed to the power receiving terminal from the side where the power receiving cable is inserted with respect to the power receiving terminal. plane, as the head of the screw of the power receiving terminal is located on the receiving device side than the extension line of the feed guide surface, by a configuration that is bent with respect to the feed guide surface, the upper Problems are those that were resolved.

  In the present invention, the power supply guide surface on the conductive plate is inclined in a direction approaching the terminal block mounting surface of the power receiving device. In other words, the user can bring the power supply cable closer to the power supply terminal at a predetermined angle (not parallel to the terminal block mounting surface of the power receiving apparatus as in the prior art). Become. For this reason, the approach of the power supply cable to the power supply terminal can be performed very easily. This effect is particularly noticeable when the terminal block is housed in a terminal box.

  The user of the power receiving device can easily connect the power supply cable to the power receiving device.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a state in which a screw-type terminal block according to an example of an embodiment of the present invention is housed in a terminal box, FIG. 2 is an enlarged view of a main part thereof, and FIG. It is a perspective view of a type terminal block.

  Referring mainly to FIG. 1 and FIG. 2, a screw-type terminal block 10 (on the terminal box 4) is provided on the mounting surface 2 </ b> A of the motor (power receiving device) 2 as a power supply structure for operating the motor 2. Attached). The terminal box 4 includes a main body 4A and a lid body 4B. The terminal box 4 is formed with an insertion port 4 </ b> C for inserting a power feeding cable 30 (described later).

  In the present invention, the “power receiving device” refers to “a member or device that receives power supply via a terminal block and to which the terminal block is attached (attached body)”. Therefore, the power receiving device in this embodiment is the motor 2, and the rectifier 70 described later does not correspond to the power receiving device of the present invention (because it is not an attachment body of the terminal block). On the contrary, the power receiving device in the present invention is not necessarily a “single device having a predetermined function by itself” such as a motor or a heater. For example, a power distribution device for distributing power to a plurality of single devices. It may be something like the output side.

  The terminal block 10 includes a power supply terminal (power supply screw type terminal) 14 and a power reception terminal (power reception screw type terminal) 16 on a conductive plate 12.

  The power supply terminal 14 includes a power supply terminal screw 18, a female screw portion 20 formed on the conductive plate 12 to which the power supply terminal screw 18 can be screwed, and a power supply guide surface 12 </ b> A formed by the conductive plate 12 near the power supply terminal 14. It is configured. In the power supply terminal 14, a crimp terminal 30 </ b> A attached to the tip of the power supply cable 30 can be sandwiched between the head 18 </ b> A of the power supply terminal screw 18 and the power supply guide surface 12 </ b> A. In this state, the power supply terminal screw 18 is screwed into the female screw portion 20, and the power supply cable 30 is connected and fixed to the power supply terminal 14. In addition, the code | symbol 31 is a plain washer (washer), and the code | symbol 33 is a spring washer.

  The power receiving terminal 16 is located at a position closer to the power feeding terminal 14 with respect to the insertion port 4 </ b> C of the power feeding cable 30 in the terminal box 4. The power receiving terminal 16 also includes a power receiving terminal screw 22, a female screw portion 24 formed on the conductive plate 12 to which the power receiving terminal screw 22 can be screwed, and a power receiving guide surface 12 </ b> B formed by the conductive plate 12 near the power receiving terminal 16. It is configured. In the power receiving terminal 16, the crimp terminals 32A and 34A attached to the tips of the first and second power receiving cables 32 and 34 can be sandwiched between the head 22A of the power receiving terminal screw 22 and the power receiving guide surface 12B. . In this state, the power receiving terminal screw 22 is screwed into the female screw portion 24, and the power receiving cables 32 and 34 are connected and fixed to the power receiving terminal 16. In addition, the code | symbol 35 is a plain washer and the code | symbol 37 is a spring washer.

  In this example, the first power receiving cable 32 is led directly to the motor 2 side, and the second power receiving cable 34 is led to the motor 2 side via the rectifier 70.

  The power feeding terminal 14 and the power receiving terminal 16 are electrically connected via the conductive plate 12. Therefore, by connecting the power supply cable 30 to the power supply terminal 14 and connecting the power reception cables 32 and 34 to the power reception terminal 16, as a result, the power supply cable 30 and the power reception cables 32 and 34 are electrically connected. can do.

  Here, paying attention to the installation angle of the conductive plate 12, as shown in FIG. 2, the conductive plate 12 is formed by the feed guide surface (that is, the conductive plate 12 near the feed terminal 14 and feeds power to the feed terminal 14. The guide surface 12A from the side where the cable 30 is inserted toward the power supply terminal 14) is attached to the motor 2 in such a manner that it is inclined by an angle α1 in a direction approaching the terminal block attachment surface 2A of the motor (power receiving device) 2. It is supposed to be configured.

  The conductive plate 12 is bent between the power supply terminal 14 and the power reception terminal 16. Specifically, the power receiving guide surface (that is, the conductive plate 12 near the power receiving terminal 16 is formed on the conductive plate 12 from the side where the power receiving cables 32 and 34 are inserted into the power receiving terminal 16 toward the power receiving terminal 16. The guide surface) 12B is inclined by an angle β1 in a direction away from the terminal block mounting surface 2A of the motor 2.

  When viewed in relation to the power feeding guide surface 12A, the power receiving guide surface 12B is such that the head 22A of the power receiving terminal screw 22 of the power receiving terminal 16 is closer to the motor 2 (power receiving device side) than the extension line L1 of the power feeding guide surface 12A. It is bent by an angle β2 with respect to the power feed guide surface 12A so as to be positioned.

  In some cases, both the power supply guide surface 12A and the power reception guide surface 12B can ensure only the size of the plain washers 31 and 35 of the power supply terminal screw 18 or the power reception terminal screw 22, for example, as shown in the power reception guide surface 12B. Sometimes not.

  As shown in FIG. 3, the screw-type terminal block 10 includes a plurality of “terminal pairs” of the power supply terminal 14 and the power receiving terminal 16 having the above-described configuration in parallel (six terminal pairs 51 in the illustrated example). To 56). The power supply terminals 14-1 to 14-6, the power reception terminals 16-1 to 16-6, and the conductive plates 12-1 to 12-6 of each of the terminal pairs 51 to 56 are composed of a power supply guide surface (12 A) and a power reception guide surface. The configuration of the power feeding terminal 14, the power receiving terminal 16, and the conductive plate 12 already described using the reference numerals without hyphens including the configuration of (12B) is exactly the same. Therefore, hereinafter, in describing each of the terminal pairs 51 to 56, the reference numerals without hyphens are appropriately represented.

  The conductive plates 12-1 to 12-6 of the terminal pairs 51 to 56 are electrically insulated by ribs 61 to 65, respectively. The ends 61 </ b> A to 65 </ b> A of the ribs 61 to 65 on the power receiving terminal 16 side are the mounting surfaces of the terminal block 10 of the motor 2 (more precisely, in this example, the terminal block 10 is connected to the motor 2 via the terminal box 4. The surface to be attached) is parallel to 2A. Due to this shape, the ribs 61 to 65 have a common power receiving terminal 16-1 to 16-6 side for preventing the power receiving cables (for example, 32 and 34) of the terminal pairs 51 to 56 from being caught or entangled. A space SP1 is formed.

  As is apparent from FIG. 1, the power receiving cables 32 and 34 of the respective terminal pairs 51 to 56 are provided under the space SP1 and further under the conductive plates 12 (12-1 to 12-6) of the terminal block 10 (see FIG. In the example of FIG. 1, the power receiving terminal 16 and the rectifier 70 are connected through the space SP2 on the side opposite to the conductive plate of the conductive plate mounting surface 10A1 on which the conductive plate 12 of the main body 10A of the terminal block 10 is mounted. Note that these spaces SP1 and SP2 also function as spaces for storing surplus power receiving cables 32 and 34.

  The terminal block 10 is integrally provided with a pedestal portion 10B extending from the main body 10A. Electronic devices such as a rectifier 70 are mounted on the pedestal portion 10B. The bolt 74 fixes the rectifier 70 to the pedestal portion 10B, fixes the pedestal portion 10B to the main body 4A of the terminal box 4, and further fixes the main body 4A of the terminal box 4 to the mounting surface 2A of the motor 2. Yes.

  Next, the operation of the terminal block 10 or the terminal box 4 that houses the terminal block 10 will be described. As described above, for the sake of convenience, reference is made to symbols without hyphens with reference to FIG. 1, but the basic operation is the same for each terminal pair.

  The power feeding cable 30 is inserted from the insertion port 4 </ b> C with the lid 4 </ b> B removed from the main body 4 </ b> A of the terminal box 4. The power supply terminal screw 18 is loosened in advance. The power feeding guide surface 12A of the conductive plate 12 near the power feeding terminal 14 is inclined (angle α1). A crimp terminal 30 </ b> A is attached to the distal end portion of the power supply cable 30. Therefore, the power supply cable 30 can be slid between the power supply terminal screw 18 and the power supply guide surface 12A very easily along the inclination (angle α1) of the power supply guide surface 12A. Therefore, the connection of the power supply cable 30 can be completed by tightening the power supply terminal screw 18 that has been loosened in this state. At this time, the power receiving guide surface 12B is bent from the power feeding guide surface 12A by an angle β2 so that the head portion 22A of the power receiving terminal screw 22 is positioned on the motor 2 side (power receiving device side) with respect to the extension line L1 of the power feeding guide surface 12A. Therefore, the head portion 22A of the power receiving terminal screw 22 is prevented from interfering with the connection of the power feeding cable 30.

  Further, since the power receiving guide surface 12B is set to be inclined in a direction away from the terminal block mounting surface 2A of the motor 2 (having an inclination angle β1), the power receiving cables 32 and 34 are placed under the conductive plate 12. The power receiving guide surface 12B of the conductive plate 12 can be faced obliquely from below through the space SP2 on the side (the conductive plate mounting surface 10A1 opposite to the conductive plate side), and the power receiving cables 32 and 34 can be easily routed. .

  The power receiving cables 32 and 34 may be routed to the rectifier 70 or the motor 2 side after being connected to the power receiving terminal 16, or conversely, from the rectifier 70 or the motor 2 side to the power receiving terminal 16 side. You may turn around. In any case, since the power receiving cables 32 and 34 are wired to the rectifier 70 or the motor 2 that is a power receiving device through the space SP2 below the conductive plates 12-1 to 12-6, the terminal block There is no surplus cable between each of the 10 terminals 14 and 16 and the rectifier 70, and the rectifier 70 can be disposed adjacent to the base 10 </ b> B extending from the main body 10 </ b> A of the terminal base 10.

  More specifically, conventionally, there is a power feeding terminal on the side close to the insertion port 4C of the terminal box 4, a power receiving terminal is on the side opposite to the power feeding terminal, and the power receiving terminal is further on the side opposite the insertion port. In general, electronic devices such as rectifiers are arranged. For this reason, a power receiving cable for connecting the power receiving terminal and the rectifier is inevitably present. If this power receiving cable is too short, the workability is poor and there is no versatility. For this reason, a power receiving cable having a certain length is used, and as a result, the rectifier cannot be installed right next to the power receiving terminal of the terminal block due to the presence of the power receiving cable.

  However, in this embodiment, the power receiving terminal 16 exists on the side opposite to the rectifier of the power feeding terminal 14 (the side closer to the insertion port 4C). That is, the power receiving cables 32 and 34 are connected to the power receiving terminal 16 on the side opposite to the rectifier of the power supply terminal 14 and pass through the space SP2 below the conductor 12 (on the side opposite to the conductive plate on the conductive plate mounting surface 10A1). Wired to (electronic device) 70. Therefore, the rectifier 70 can be placed on the pedestal portion 10B of the terminal block 10 without any trouble. As a result, the overall size of the terminal box 4 can be reduced.

  In addition, since the rectifier 70 is placed on the pedestal portion 10B of the terminal block 10, all of the rectifier 70, the terminal block 10, and the terminal box 4 are mounted on the mounting surface 2A of the motor 2 with only two bolts 74. Can be fastened together. For this reason, the number of parts can be reduced, and the number of assembly steps can be reduced.

  In addition, in the said embodiment, although the terminal block 10 was attached to the motor 2 side which is a receiving device in the state accommodated in the terminal box 4, in this invention, a terminal block is not necessarily accommodated in the terminal box. There is no need to be. For example, the terminal block may be directly attached to the attachment surface of the power receiving device, and the power receiving device may be housed in a drive source case of a larger machine as a whole.

  In the above embodiment, the power receiving guide surface 12B is attached to the motor 2 side so as to incline away from the terminal block attaching surface 2A of the motor 2 (with an inclination angle β1), and the power receiving cables 32 and 34 are electrically conductive. When the power receiving guide surface 12B of the conductive plate 12 is faced through the space SP2 on the lower side of the plate mounting surface, consideration has been given so that the power receiving cables 32 and 34 can be easily routed. However, in the present invention, the inclination angle β1 is not necessarily formed.

  Regardless of the type of power receiving device, it can be widely used as the structure of a screw-type terminal block of an industrial power receiving device and a terminal box containing the terminal block.

Sectional drawing which shows a mode that the screw-type terminal block which concerns on an example of embodiment of this invention is stored in the terminal box. 1 is an enlarged view of the main part of FIG. Perspective view of the screw type terminal block

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Motor 2A ... Terminal block attachment surface 4 ... Terminal box 4A ... Main body 4B ... Cover body 4C ... Insert 10 ... Terminal block 10A ... Main body of terminal block 10B ... Base part 12 ... Conductive plate 12A ... Power feeding guide surface 12B ... Power receiving Guide surface 14 ... Power feeding terminal 16 ... Power receiving terminal 18 ... Power feeding terminal screw 20 ... Female screw portion 22 ... Power receiving terminal screw 24 ... Female screw portion 30 ... Power feeding cable 32, 34 ... Power receiving cable 61-65 ... Rib 61A-65A ... Rib End 70 ... rectifier

Claims (3)

A screw-type terminal block that has a screw-type power supply terminal to which a power-supply cable is connected and a screw-type power-receiving terminal to which a power-receiving cable is connected on a conductive plate and can supply power to the power-receiving device side In
A power feeding guide surface that is formed by a conductive plate near the power feeding terminal and that faces the power feeding terminal from the side where the power feeding cable is inserted with respect to the power feeding terminal is inclined in a direction approaching the terminal base mounting surface of the power receiving device. The power receiving guide surface that is attached to the power receiving device side and is formed by a conductive plate near the power receiving terminal and that faces the power receiving terminal from the side where the power receiving cable is inserted with respect to the power receiving terminal, A screw-type terminal block which is bent with respect to the power supply guide surface so that a head portion of the screw is positioned on the power receiving device side with respect to an extension line of the power supply guide surface. In claim 1,
A power receiving guide surface that is formed by a conductive plate in the vicinity of the power receiving terminal and that faces the power receiving terminal from the side where the power receiving cable is inserted with respect to the power receiving terminal is inclined in a direction away from the terminal block mounting surface of the power receiving device. A screw-type terminal block that is attached to the power receiving device side as described above. A screw-type terminal block that has a screw-type power supply terminal to which a power-supply cable is connected and a screw-type power-receiving terminal to which a power-receiving cable is connected on a conductive plate and can supply power to the power-receiving device side Is a terminal box structure housed in a terminal box,
A power feeding guide surface that is formed by a conductive plate near the power feeding terminal and that faces the power feeding terminal from the side where the power feeding cable is inserted with respect to the power feeding terminal is inclined in a direction approaching the terminal base mounting surface of the power receiving device. And attached to the power receiving device side,
The terminal box structure characterized in that the power receiving terminal is located closer to the power feeding terminal than the feeding port of the power feeding cable in the terminal box.

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