JP5159256B2 - Screw type terminal, terminal connector and wiring connection set - Google Patents

Description

  The present invention relates to a screw-type terminal used to electrically connect different circuits to each other, a terminal connection body connected to a head portion of the screw-type terminal, and a wiring connection set including the screw-type terminal and the terminal connection body. .

  For example, in a substation or a power plant, an electric circuit (control circuit) provided with a circuit breaker or a relay is used. And in order to confirm the operation state of the circuit breaker and the relay, a confirmation inspection using a test apparatus is performed periodically and as necessary. Here, the confirmation inspection is often performed with the control circuit and the inspection device being electrically connected in a state where the power supply of the control circuit is utilized, that is, without turning off the power supply. And this electrical connection is normally performed via a terminal (relay terminal). As a terminal for making this connection, a screw-type terminal which will be described next is often used.

  FIG. 4 is a diagram illustrating a state in which the wiring from the inspection apparatus is connected to the screw-type terminal to which the wiring from the control circuit is connected. The screw-type terminal 100 shown in the figure includes a male screw portion 102 provided with a threaded portion including a screw groove and a head portion 104 provided with a driver groove for rotating the male screw portion 102 on the upper surface. Have. Here, the head portion 104 is formed in a substantially hemispherical shape. As shown in the figure, a plurality of screw-type terminals 100 are attached to the terminal block 16 in a state where a plurality of screw terminals 100 are gathered. Here, the screw type terminal 100 is attached to the terminal block 16 by screwing the male screw portion 102 into a screw hole (not shown) provided in the terminal block 16. The screw-type terminal 100 is provided with a connection seat 18a in a state of being sandwiched between the terminal block 16 and the head portion 104. The other end of the wiring 18 whose one end is connected to the control circuit is connected to the connection seat 18a.

  In the example shown in the figure, the wiring of the inspection apparatus is connected to the screw-type terminal using a so-called cleaver-type clip 108. The shed clip 108 has a pair of sandwiching portions 108a and 108b, which are serrated portions that are formed in a sawtooth shape at portions facing each other, and both sawtooth portions using a spring. Are biased to approach each other. Further, the other end portion of the wiring having one end connected to the inspection apparatus is connected to the end portion of the mouth clip 108 opposite to the position where the holding portions 108a and 108b are provided (not shown). ). Then, the hook-type clip 108 is fastened to the head portion 104 so that the head portion 102 of the screw-type terminal 100 is clamped by the sawtooth portions of the clamping portions 108a and 108b. In this way, the wiring from the inspection device is connected to the screw-type terminal 100, and thus the control circuit and the inspection device are electrically connected.

  Patent Document 1 discloses another technique for connecting a wiring to a head portion (screw head) of a screw-type terminal. The technique disclosed in this document uses a contact path clip (10) having a special structure. Then, as shown in FIG. 2 of the same document, for example, the structure of the electroconductive magnet portion (11) to which the lead wire (wiring) (20) is joined is screwed into the screw-type terminal (2). It is adsorbed to the head portion of the. In the structure illustrated in FIG. 2 of the same document, a spherical concave portion is formed in the magnet portion (20), and the above head is in close contact with the spherical screw head (head portion). Adsorption to the part.

  Further, in the technique disclosed in the same document, as shown in FIGS. 8 and 9 of the same document, an opening hole (6a) is provided in the cover (6) of the terminal block 1, and the opening hole (6a) is interposed therebetween. A configuration in which the contact path clip (10) is connected to the screw terminal (10) is also illustrated. In this case, the contact path clip (10) is strongly locked to the cover (6), and the contact path clip (10) is not easily detached.

JP 2006-127966 A

  In the above-described technology for pinching the head portion of the screw type terminal with the hook type clip and connecting the wiring to the screw type terminal, the screw head (head portion) is formed in a hemispherical shape. Therefore, stable wiring connection is difficult. And since the power supply of the control circuit to which the screw-type terminal is connected is kept alive, the wiring connection to the head is performed, so if the hook-type clip is removed, the control circuit ground fault or short circuit There is also a risk of power failure depending on the type of control circuit. Moreover, it is necessary to form the size of the head part to such an extent that it can be connected with a hook-type clip, and the size of the screw type terminal that can be used is limited.

  In the technique disclosed in Patent Document 1, the wiring is connected to the head portion of the screw-type terminal by the attractive force of the magnet. However, in the connection of the clip only by the attractive force of the magnet, the clip is the same as described above Is easily detached from the screw-type terminal, and the same inconvenience occurs as described above. Further, when an opening hole is formed in the cover of the terminal block and the clip is locked to the cover, a trouble is required for processing the cover so as to conform to the shape of the clip, and the following inconveniences also occur. That is, when the clip is not used, the opening hole formed in the cover of the terminal block is opened, dust and foreign matter enter the cover through the opening hole, and when the clip is used, this foreign matter and dust removal work is not done. Necessary.

  Further, an oxide film such as rust is usually formed on the surface of the head portion, and a thin dust layer is formed. When such a material that is difficult to conduct electricity covers the entire surface of the screw head, the contact body and the head portion are simply brought into close contact with the screw head such as the magnet portion disclosed in Patent Document 1. A dust layer or the like is interposed between the two. In such a case, depending on the situation, there is a concern that a contact failure occurs between the contact body and the screw head, and it becomes difficult for electricity to flow. That is, there is a risk that it is difficult to connect the wiring to the head portion using the screw-type terminal.

  It is an object of the present invention to easily connect a terminal connection body to a head portion, and reliably maintain the connection state of the terminal connection body, and to make good contact between the terminal connection body and the head portion. The present invention is to provide a screw-type terminal that can be maintained and a terminal connection body to the screw-type terminal.

The terminal connector of claim 1 is:
A male threaded portion provided with a threaded portion that is screwed into an attachment location for connection to an electric circuit, a substantially cylindrical shape formed at one end of the male threaded portion, and a threaded portion provided on the outer peripheral surface thereof In a terminal connection body that is connected to the head portion of a screw-type terminal provided with a head portion and connects the head portion to another electric circuit different from the electric circuit, the head portion is screwed to the head portion. And a female screw part formed of a conductive member, and a contact connected at one end to the other electric circuit and always in contact with the female screw part .

Thus, the female threaded portion of the pin connector to the head portion of the screw-type terminal can be firmly fixed so as not come off easily. Therefore, the risk of a ground fault, a short circuit, and further a power failure phenomenon due to the terminal connector being detached from the head portion and coming into contact with another portion can be reliably avoided. In addition, when the connection of another electrical circuit to the above-described electrical circuit is performed with a periodic inspection operation such as a circuit test, there is a concern that the terminal connection body may come off from the head portion of the screw-type terminal. Therefore, the inspection work can be facilitated and speeded up. Since the terminal connection body is in contact with the female screw portion, electrical wiring connection between the screw-type terminal side and the wiring on the terminal connection body side becomes possible.

The terminal connection body according to claim 2 is the terminal connection body according to claim 1, wherein the contact is housed in a housing portion formed in the female screw portion, and within the housing portion, by a biasing means. It is provided by being urged in a direction to maintain a contact state with the female screw portion .

Thereby, the favorable contact state of a contact and a female screw part is maintained. Since the contact state between the contact and the female screw portion is maintained by the urging means, the wiring is not easily cut even if the wiring is subjected to an impact. Therefore, failure due to use hardly occurs and the durability can be increased.

A wiring connection set according to a third aspect includes the screw-type terminal according to the first or second aspect and a terminal connection body . Thereby, different wirings are connected easily and reliably.

The wiring connection set according to claim 4 is the wiring connection set according to claim 3, wherein the screwing portion of the head portion of the screw-type terminal is replaced with a configuration in which a screwing portion is provided around the screwing portion. It is a female screw portion formed substantially at the center of the outer surface of the ceiling of the head portion, and the screwed portion of the terminal connector is a male screw portion instead of the female screw portion.

As described above, by providing the female screw portion at the position of the head portion of the screw-type terminal, it is not necessary to form the entire head portion in a cylindrical shape. It can also be formed. Accordingly, it is possible to maintain a low risk that a wire or metal mold will be applied to the head portion and a short circuit or the like will occur. Further, since the terminal connection body has a male screw portion for connection to the screw-type terminal, the size of the terminal connection body can be made relatively small.

Invention of Claim 5 is a screw type terminal of any one of Claims 1-4, Comprising: The direction of the said threading part provided in the said head part is said male thread part. The present invention is characterized in that it is made to be opposite to the direction in which the provided screwing portion is rolled.

Thereby, the direction rotated in order to remove the terminal connector which screwed together and connected to the head part turns into a direction rotated in order that a male screw part may be attached to an attachment location. Therefore, even when the connection state of the terminal connection body once connected to the head portion is hardened, when the terminal connection body is removed, the attachment state of the male screw portion to the attachment location is not loosened.

  According to the screw-type terminal and the terminal connection body of the present invention, the terminal connection body can be easily connected to the head portion of the screw-type terminal, and the connection state of the terminal connection body is reliably maintained without being removed, and Good contact between the terminal connector and the head portion is maintained. Therefore, a ground fault, a short circuit, or a power failure due to the terminal connector being detached from the screw-type terminal can be prevented.

Embodiments of the present invention will be described with reference to the drawings. Figure 1 is a diagram illustrating a configuration of a screw-type terminal to the present invention. Here, the same reference numerals are given to the same elements as those shown in FIG. 4, and the description thereof is omitted. In the screw-type terminal 10 of the present embodiment, a head portion 14 formed at one end of a male screw portion 12 which is a constituent part of the screw-type terminal 10 is formed in a substantially cylindrical shape, and the head portion 14 side A threaded portion 14a made of a thread groove is provided on the outer peripheral surface of the portion. A terminal connection body 20 (see FIG. 2), which will be described later, is screwed into the threaded portion 14a to electrically connect the screw-type terminal 10 and the terminal connection body 20. Further, the winding direction of the screwing portion 14 a provided in the head portion 14 (the direction in which the screw groove is rolled) is set opposite to the winding direction of the screwing portion provided in the male screw portion 12. The screw terminal 10 is made of a metal such as iron.

  Here, the screw-type terminal 10 is inserted by screwing the male screw portion 12 into a screw hole 16a formed in a terminal block 16 (illustrated by a dotted line in the drawing) as an attachment location. Then, the connection seat 18 a is attached to the screw-type terminal 10 by sandwiching the connection seat 18 a between the terminal block 16 and the head portion 14 of the screw-type terminal 10. The end of the wiring 18 is connected to the connection seat 18a.

  Here, in this Embodiment, the wiring 18 is connected to the control circuit provided in the power station. And in order to confirm the operating state of the circuit breaker, the relay, etc. provided in this control circuit, the terminal connection body 20 (refer FIG. 2) to which the wiring from the test apparatus which has an electrical circuit for a test | inspection inside was connected. ) Is connected to the head unit 14 to operate the test apparatus.

  2A and 2B are diagrams illustrating a terminal connection body connected to the screw-type terminal illustrated in FIG. FIG. 2A illustrates a state before connection to the screw-type terminal, and FIG. 2B illustrates a state connected to the screw-type terminal. A terminal connector 20 according to the present embodiment will be described with reference to FIG. The terminal connector 20 has a female screw portion 22, and the female screw portion 22 is a conductive portion formed of a conductive member (electrically conductive material) such as iron or copper. The entire female screw portion 22 is formed in a substantially cylindrical shape, and a female screw 22a to which the head portion 14 of the screw-type terminal 10 is screwed is provided at one end portion. On the other end side of the female screw portion 22, a storage portion 22b for storing the contactor 24 is formed. Here, the contact 24 is formed of a metal such as iron, and one end of the wiring 26 is joined. Note that the other end of the wiring 26 is connected to a test apparatus (not shown).

  In the present embodiment, the accommodating portion 22b is formed as a hollow portion in the female screw portion 22, and the wiring 26 connected to the contact is introduced into the accommodating portion 22b through the introduction hole 22c. . A coil spring 22d is housed as an urging means in the housing portion 22b, and the contact 24 is urged against the wall surface of the housing portion 22b by the coil spring 22d.

  Due to the configuration of the storage portion 22b and the coil spring 22d, the contactor 24 is always in contact with the inner wall surface of the storage portion 22b while being freely rotatable with respect to the female screw portion 22. Further, a grip cover 28 made of an electrically insulating material is provided on the outer periphery of the female screw portion 22 except for the portion of the female screw 22a. The terminal connecting body 20 is connected to and removed from the head portion 14 of the screw-type terminal 10 by holding the grip cover 28. Here, the screw-type terminal 10 and the terminal connector 20 described above are normally used as a wiring connection set that combines them.

  As described above, first, the terminal connection body 20 can be firmly fixed to the head part 14 of the screw-type terminal 10 so that the terminal connection body 20 is not easily detached by the configuration in which the terminal connection body 20 is connected to the head part 14 by screwing. . Therefore, a ground fault, a short circuit, and further a power failure phenomenon caused by the terminal connector being detached from the head portion 14 and coming into contact with another portion can be reliably avoided. Further, it is not necessary to worry that the terminal connector 20 is detached from the head portion 14 of the screw-type terminal 10, so that the test work can be performed easily and quickly. Moreover, since the head part 14 and the terminal connector 20 are connected by screwing, various types of screw-type terminals 10 can be formed.

  And the terminal connection which screwed together and connected to the head part 14 by the structure by which the winding direction of the screwing part of the external thread part 12 and the winding direction of the screwing part 14a of the head part 14 were formed in the mutually opposite direction The direction of rotation for removing the body 20 is the direction of rotation for attaching the male screw portion 12 to the attachment location. Therefore, even when the connection state of the terminal connection body 20 once connected to the head portion 14 is hard, when the terminal connection body 20 is removed, the attachment state of the male screw portion 12 to the attachment location may be loosened. Absent. Therefore, the test operation of the control circuit can be completed with certainty. Any of the winding direction of the threaded portion of the male screw portion 12 and the winding direction of the threaded portion 14a of the head portion 14 may be right-handed.

  Furthermore, since the female screw 22a is screwed into the head portion 14 by the above-described configuration of the terminal connector 20, the terminal connector 20 can be easily connected to the screw terminal 10. Since the contact 24 is maintained in a freely rotating state with respect to the female screw 22, it is connected to the contact 24 at the time of rotation when the terminal connector 20 is connected to the screw-type terminal 10 or at the time of rotation at the time of removal. The twisted wiring 26 is prevented from being twisted. Therefore, the connection work and the removal work of the terminal connector 20 to the screw-type terminal 10 are facilitated. Further, due to the above-described configuration of the storage portion 22b and the coil spring 22d, even if an impact is applied to the wiring 26 connected to the contact 24, for example, the impact is absorbed by the coil spring. Accordingly, it is possible to configure the terminal connector 20 that is less likely to fail due to use and has high durability.

Further, when to be connected threadably terminal connection member 20 to the head portion 14, formed in the terminal connecting bodies 20 screwed screw groove (female screw 22a) is formed in the threaded portion 14a of the head portion 14 The screwing portion 14a is slid in a state in which it is in contact with the thread groove. That is, they are screwed together with a frictional force acting on the mutual thread grooves. As a result, the oxide film or dust layer formed on the screwing portion 14a of the head portion 14 is removed, and a metal surface appears in a wide range of the screwing portion 14a. Therefore, it is possible to maintain good electrical conductivity between the terminal connecting body 20 and the head portion 14.

  FIG. 3 is a view for explaining another embodiment of the screw-type terminal according to the present invention and a terminal connection body connected to the head portion of the screw-type terminal. A characteristic matter of the screw-type terminal 30 according to the present embodiment is that a female screw portion 34 a is provided at the center of the outer surface of the ceiling of the head portion 34 formed at one end of the male screw portion 32. Corresponding to the configuration of the screw-type terminal 30, the terminal connection body 36 for connecting to the head portion 34 has a male screw portion 38 that is screwed into the female screw portion 34a. That is, when the male screw portion 38 is screwed into the female screw portion 34a, the head portion 34 of the screw-type terminal 30 and the terminal connector 36 are electrically joined. The head portion 34 of the screw-type terminal 30 is provided with a driver groove 34b for rotating the male screw portion 38.

  Thus, by providing the female screw portion 34a at the center of the ceiling outer surface of the head portion 34 of the screw-type terminal 30, it is not necessary to form the entire shape of the head portion 34 in a columnar shape, for example, a hemispherical shape. It is also possible to do. Further, unlike the embodiment shown in FIG. 1, it is not necessary to provide the threaded portion 14a on the outer periphery of the head portion 14, and almost the entire outer periphery can be formed into a smooth curved surface. Therefore, it becomes difficult for a wire or a metal piece to catch on the head part 34, and the danger of a short circuit caused by this can be kept low. And since the terminal connection body 36 becomes a structure which has the external thread part 38 for the connection to the screw type terminal 30, the size of the terminal connection body 36 can be formed comparatively small.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment shown in FIG. 1, the screw-type terminal 10 is used for connecting a control circuit of a power plant, but may be used for connecting a control circuit of a substation. Moreover, you may provide a protrusion in the smooth bottom face of the internal thread 22a about the terminal connection body 20 shown in FIG. Thereby, at the time of connection with the head part 14, not only mutual screwing parts but a contact state is formed also in the projection part and the head part 14, and more reliable electrical connection is performed.

It is a figure explaining the composition of the screw type terminal concerning the present invention. It is the figure explaining the terminal connection body connected to the screw type terminal shown in Drawing 1, (A) explains the state before connecting to the screw type terminal, and (B) shows the screw type terminal. Explains the connected state. It is the figure explaining other embodiment of the screw type terminal concerning this invention, and a terminal connector. It is the figure which illustrated the state which connected the wiring of the test | inspection apparatus to the terminal to which the wiring from a control circuit was connected.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 30 Screw type terminal 12, 32 Male screw part 14, 34 Head part 14a Screwing part 16 Terminal block 18 Wiring 18a Connection seat 20 Terminal connection body 22 Female screw part 22a Female screw 22b Storage part 24 Contact 26 Wiring 28 Grasping Cover 34a Female thread part 36 Terminal connector 38 Male thread part

Claims (5)

A male threaded portion provided with a threaded portion that is screwed into an attachment location for connection to an electric circuit, a substantially cylindrical shape formed at one end of the male threaded portion, and a threaded portion provided on the outer peripheral surface thereof In the terminal connection body connected to the head portion of the screw-type terminal provided with the head portion, and connecting the head portion to another electric circuit different from the electric circuit,
A female screw portion formed of a conductive member and screwed to the head portion;
One end connected to the other electric circuit, and a contact provided to always contact the female screw portion;
A terminal connection body comprising: The contact is housed in a housing portion formed in the female screw portion, and is urged and provided in the housing portion by a biasing means in a direction to maintain a contact state with the female screw portion. The terminal connection body according to claim 1 , characterized in that: Claim 1 or wiring connection set characterized by having a screw-type terminal and pin connection body according to 2. The screwed portion of the head portion of the screw-type terminal is a female screw portion formed substantially at the center of the outer surface of the ceiling of the head portion, instead of providing a screwed portion around the head portion.
Threaded portion of the terminal connector, the place of the female screw portion, the wiring connecting set according to claim 3, characterized in that it is the male threaded portion. The screw-type terminal according to any one of claims 1 to 4,
The Maki direction of the engagement portion provided in the head portion, the possible features and to Rene shaped pin that is in the opposite direction to Maki direction engagement portion provided on the male screw portion.

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