WO2010055548A1

WO2010055548A1 - Connection device and control center

Info

Publication number: WO2010055548A1
Application number: PCT/JP2008/003345
Authority: WO
Inventors: 孝弘山中
Original assignee: 三菱電機株式会社
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2010-05-20
Also published as: DE112008004167B4; DE112008004167T5; CN102204022A; KR101211898B1; CN102204022B; TWI369046B; KR20110057260A; MY171756A; TW201021336A; JPWO2010055548A1; JP5100847B2

Abstract

In a conventional connection device performing electrical connection and disconnection of first and second conductors, a contactor having a pair of legs formed by bending a leaf spring into U-shape is encased in an insulating case and thereby it is difficult to obtain a thin connection device without lowering the conduction capacity. The inventive connection device employs a contactor having a pair of legs formed by putting a slit in the leaf spring, and thereby a thin connection device can be obtained without lowering the conduction capacity.

Description

Connection device and control center using the same

The present invention relates to a connection device used for a function unit of a control center that performs start-up control and protection of, for example, a motor used in a power plant.

This type of connection device is a device in which a clip-like contact having a pair of legs formed by bending a leaf spring into a U-shape is accommodated in an insulating case, and the U-shaped bent portion After connecting the functional unit side electric wire to the abdomen in the vicinity by welding or the like, and inserting / removing the blade as the bus of the control center between the pair of legs, the electric wire on the functional unit side And electrical connection or disconnection between the blade and the blade (for example, Patent Document 1).

JP-A-6-233421 (paragraph 0006, FIG. 8)

Since the contactor used in the conventional connecting device disclosed in Patent Document 1 is obtained by bending a leaf spring into a U-shape, it becomes a wide structure. The width of the connecting device in which such a contact is housed in an insulating case becomes wider along the direction of the current flowing through the blade. On the other hand, the functional unit housed in the control center is required to be thin due to the demand for space saving, and accordingly, the connecting device used for the functional unit is also required to be thin. However, when the contact device with a narrow leaf spring is used to reduce the thickness of the connecting device, the density of current flowing through the contact increases, and there arises a problem that it is difficult to ensure the necessary current carrying capacity.

An object of the present invention is to solve the above-described problems and to obtain a connection device that is thinner than a conventional connection device without reducing energization capacity.

A connection device according to the present invention is a connection device in which a contact formed with a connection portion connected to a first conductor and a pair of legs that hold the second conductor is housed in an insulating case. Since the slit is formed in the conductive leaf spring, the pair of legs are formed.

According to the present invention, since a slit is formed in the leaf spring, a contact having a pair of legs is formed, and the contact is accommodated in the insulating case, so that the width of the connecting device (flows to the blade). The width along the direction of current) does not depend on the width of the leaf spring, and a thin connection device having a large energization capacity can be obtained.

2 is a structural diagram of a contact used in Embodiment 1. FIG. FIG. 3 is a top view showing the configuration of the connection device according to the first embodiment and the insertion / extraction direction with respect to the blade. 4 is a top view of a contact used in Embodiment 1. FIG. 5 is a configuration diagram of an elastic member used in Embodiment 2. FIG. It is a top view when the elastic member of Embodiment 2 is attached to the contact. 6 is a top view of a contact used in Embodiment 3. FIG. 6 is a top view of a contact used in Embodiment 4. FIG. 10 is a top view of a contact used in Embodiment 5. FIG. 10 is a perspective view of an elastic member used in Embodiment 5. FIG. FIG. 11 is a top view when an elastic member is attached to the contact according to the fifth embodiment. 10 is a perspective view of a connection device used in Embodiment 5. FIG. FIG. 10 is a perspective view when a blade 30 is gripped by a connection device according to a fifth embodiment. It is a perspective view of the contactor used for Embodiment 6. FIG. FIG. 10 is a perspective view of a connection device used in a sixth embodiment. 18 is an external view of a functional unit used in Embodiment 7. FIG. FIG. 20 is an external view of a control center used in Embodiment 7.

Explanation of symbols

1 connection device,
10 contacts, 11 slits,
12 legs, 13a contact part,
13b guide part, 14 insulation case,
15 elastic member, 16 oval hole,
17 steps, 18 rivets,
20 connections,
22 Electric wire (first conductor) on the functional unit side,
30 Blade of control center (second conductor),
40 functional units, 50 control centers

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. 1A and 1B are structural views of a contactor that is a main component of the connection device used in Embodiment 1, wherein FIG. 1A is a top view, FIG. 1B is a side view, and FIG. 1C is a front view. FIG. 2 is a top view showing a configuration of a connecting device in which the contact is housed in an insulating case and a direction in which the control center is inserted into and removed from the blade. FIG. 3 is a top view of the contact in which only the width of the leaf spring is made wider than the contact in FIG. 2 and FIG. 3, the same reference numerals are given to the same or corresponding parts as in FIG.

As shown in FIG. 1, the contact 10 used in the first embodiment of the present invention includes a pair of first legs by inserting a Y-shaped slit 11 in a conductive leaf spring made of phosphor bronze, a steel plate or the like. 12a and a second leg portion 12b, and a contact portion 13a for holding a blade, which is a bus (second conductor) of the control center, on the mutually opposing surfaces of each leg portion; A guide portion 13b that facilitates insertion of a cable is formed, and a connection portion 20 that can be connected to an electric wire (first conductor) on the functional unit side is attached.

The Y-shaped slit 11, contact portion 13a, guide portion 13b and the like of the contact 10 are formed by punching one leaf spring base material with a press machine, cutting machine, laser processing machine, wire processing, etc. It can be easily obtained by cutting out with a machine or the like. In addition, since heat treatment is performed after processing as necessary, optimal elastic characteristics can be secured in the leaf spring, so that the elastic characteristics for gripping the blade 30 between the first leg portion 12a and the second leg portion 12b can be obtained. The possessed contact 10 can be obtained.

The shape of the contact surface of the contact portion 13a is flat so as to be brought into surface contact with the square rod-shaped blade 30 so as to match the shape of the blade. The connecting portion 20 is obtained by welding a connecting wire to a connecting portion 21 of a leaf spring. The connecting portion does not necessarily need to use a connecting line, and can be cut out from the leaf spring base material as will be described in detail later.

As shown in FIG. 2, the connecting device 1 used in the first embodiment of the present invention is one in which the contact 10 of FIG. 1 is housed in an insulating case 14, and the connecting wire 20 is the insulating case. It penetrates 14 outer walls and can be connected to an electric wire on the functional unit side. Further, when the blade 30 is inserted between the legs 12 of the contact 10 in the insulating case 14, the blade 30 and the insulating case 14 are prevented from interfering with each other. The notch part 14a is formed.

Since the connecting device 1 according to the first embodiment of the present invention configured as described above is moved along the direction of the arrow in FIG. 2, the control center is located between the pair of

legs

11 a and 11 b of the contact 10. The blade 30 can be inserted and removed, and the electrical connection and disconnection between the electric wire on the functional unit side and the blade can be performed.

FIG. 3 is a contact in which only the width of the leaf spring is made wider than that of the contact in FIG. 1, and thus the width of the

legs

12a and 12b is increased without changing the thickness of the leaf spring. The current density flowing through the contact can be kept low. In other words, according to the present invention, since the leaf spring is provided with a slit, a contact having a pair of legs can be obtained, and as a narrow connection device (using a thin contact of the leaf spring) In addition, since the energization capacity can be increased by increasing the width of the

leg portions

12a and 12b of the contact 1, it is possible to obtain a connection device that is thin and has a large energization capacity. *

Embodiment 2. FIG.
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a structural diagram of an elastic member attached to the contact used in the second embodiment, wherein (a) shows a top view, (b) shows a side view, and (c) shows a front view. FIG. 5 is a top view when the elastic member is attached to the contact shown in FIG. In addition, in each site | part in FIG. 5, the same code | symbol is provided to the same part thru | or a corresponding part as FIG. 1 thru | or 4, and the description is abbreviate | omitted.

As shown in FIG. 4, the elastic member 15 used in Embodiment 2 of the present invention is formed by bending a leaf spring into a C-shape. As shown in FIG. 5, the elastic member 15 is fitted on the leg portion 12 of the contact 10 and gives an elastic force so as to narrow the width of the slit 11. The connection device 1 according to the second embodiment is such that the contact 10 having the elastic member as described above is housed in an insulating case 14.

When the blade 30 is inserted between the legs 12 of the connection device 1 of the second embodiment, the blade 30 overlaps the elastic force acting between the legs 12 and the elastic force of the elastic member 15. Is gripped strongly. Along with this, the micro contact area at the joint surface between the blade 30 and the contact portion 13a of the connection device 1 is increased, and the electrical contact resistance is lowered, so that the reliability as the connection device 1 is increased. It has the effect of.

Embodiment 3 FIG.
Hereinafter, the third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 6 is a top view of the contact used in the third embodiment. In addition, in each site | part in FIG. 6, the same code | symbol is provided to the same part thru | or a corresponding part as FIG. 1, and the description is abbreviate | omitted. As shown in FIG. 6, the contact 10 used in Embodiment 3 of the present invention is formed by providing an elliptical hole 16 at the base of a Y-shaped slit. In other words, the structure of the base of the slit is terminated with a curved surface. Since the base portion of the slit acting on elasticity is terminated at the curved surface, the force applied from the leg portion 12 along with the insertion of the blade 30 is distributed along the curved surface, and as a result, the base portion of the slit. The elastic property of is stable. Therefore, the control center blade 30 can be inserted / removed with good reproducibility, and fatigue damage and plastic deformation at the base of the slit can be suppressed.

Embodiment 4 FIG.
Hereinafter, the fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 is a top view of a contact used in the fourth embodiment. In addition, in each site | part in FIG. 7, the same code | symbol is provided to the same part thru | or an equivalent part as FIG.1 and FIG.2, and the description is abbreviate | omitted. As shown in FIG. 7, the contact 10 used in Embodiment 4 of the present invention is provided with an I-shaped slit, and its base is curved. Even in the connection device 1 using the contact 10 having such a structure, a pair of first leg portions 12a and second leg portions 12b are formed in the same manner as in the connection devices of the first to third embodiments. Therefore, the control center blade 30 can be inserted and removed, and the effect of the hole 16a has the special effect that the plastic deformation of the base of the slit can be suppressed as in the third embodiment.

Embodiment 5 FIG.
Hereinafter, the fifth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 8 is a top view of a contact used in the fifth embodiment, and FIG. 9 is a perspective view of an elastic member attached to the contact. FIG. 10 is a top view of a contact to which an elastic member is attached, and FIG. 11 is a perspective view of a connection device in which these are housed in an insulating case. FIG. 12 is a perspective view of the connecting device holding the blade. 8 to 12, the same or corresponding parts as those in FIGS. 1 to 7 are denoted by the same reference numerals, and the description thereof is omitted.

The contactor 10 used in the fifth embodiment of the present invention has a high conductivity such as a copper plate, but is formed of a weak material with respect to the spring property. For example, as shown in FIG. 8, a pair of first leg 12a and second leg 12b formed by inserting a Y-shaped slit 11 in a copper plate is provided. A contact portion 13a for gripping the blade 30 and a guide portion 13b for facilitating insertion of the blade are formed, and a connection portion 20 that can be connected to the electric wire on the functional unit side is formed on the opposite side of the contact portion 13a. Is.

The Y-shaped slit 11 includes a first slit portion 11a, a second slit portion 11b, a third slit portion 11c, a fourth slit portion 11d, and a fifth slit portion having a contact portion 13 that holds the blade 30 as a wall surface. 11e. When the gap width of the fourth slit portion 11d is cut narrower than that of the first slit portion 11a and the blade 30 is not inserted into the fifth slit portion 11e, implementation of the present invention described later is performed so that the gap width is eliminated. It is clamped by the elastic member 15 of the form 5. A pair of stepped portions 17 having grooves for attaching the elastic members 15 are formed on the pair of leg portions 12. In addition, preparation of such a contactor 10 is excellent in mass production of punching using a press machine or the like.

As shown in FIG. 9, the elastic member 15 used in the fifth embodiment of the present invention has an elliptical ring member formed of a spring material such as phosphor bronze or a steel plate at a substantially central portion in the longitudinal direction of the elliptical shape. It is formed to be U-shaped when viewed from the side surface and the top surface by being bent at the bending portion 15a. Note that the inner diameter in the short direction of the bent portion 15a is slightly shorter than the distance between the pair of step portions 17 formed on the leg portion 12 in order to obtain an elastic force acting in the direction of narrowing the width of the slit. ing. Further, the width of the elastic member 15 becomes wider from the bent portion 15 toward the end. In addition, since the spring material used for the elastic member 15 does not necessarily need to have conductivity, it may be a plastic material having other elasticity, and the molding in that case is suitable.

As shown in FIG. 10, the bending portions 15 a of the pair of elastic members 15 are slid and inserted until they contact a pair of stepped portions 17 formed on the contact 10, and are fitted into and fixed to the grooves of the stepped portions 17. The At this time, the fourth slit portion 11 d of the contact 10 is pushed and narrowed by the elastic force of the elastic member 15 until there is no gap. That is, even if the contact member 10 is made of a conductive material having almost no elasticity by attaching the elastic member 15, the first leg portion 12 a and the second leg portion are caused by the spring action of the attached elastic member 15. There is an effect that the blade 30 can be firmly held during the period 12b. Further, since the U-shaped elastic member 15 is sandwiched between the upper and lower surfaces of the contact 10 that is easily plastically deformed, the deformation of the leg portion 12 of the contact 10 is particularly suppressed, and plastic deformation occurs. It has the special effect that the difficult contactor 10 can be obtained.

As shown in FIG. 11, in the connecting device 1 used in Embodiment 5 of the present invention, the contact 10 to which the elastic member 15 of FIG. 10 is attached is housed in an insulating case 14, and the connecting portion 20 is insulated. It was taken out of the case 14. As shown in FIG. 12, the connecting portion 20 caulks the crimping component 21 and is integrally connected to the electric wire 22 (first conductor) on the functional unit side.

The connecting device 1 according to the fifth embodiment of the present invention configured as described above is controlled between the pair of

leg portions

12a and 12b (the fifth slit portion 11e) of the contact 10 in the direction of the arrow in the figure. The lucent blade 30 can be inserted and removed. When the blade 30 is inserted between the

leg portions

12a and 12b, a gap is generated in the fourth slit portion 11d having no gap, and the elastic member 15 is also expanded. The elastic force of the expanded elastic member 15 is increased, and the blade 30 is firmly held by the connecting portion 13 provided on the leg portion 12, so that the electrical connection is ensured. Therefore, the connection device 1 used in the fifth embodiment can reliably perform electrical connection and disconnection between the electric wire on the functional unit side and the elliptical rod-shaped blade 30 that is the bus bar of the control center. Is. In order to reduce the contact resistance, the surface shape of the contact portion 13a of the contact 10 used in the fifth embodiment of the present invention is a curved surface so that the surface can be brought into contact with the surface of the elliptical rod-shaped blade 30. ing. In other words, a contact surface shape matching the shape of the blade 30 is formed on the contact portion 13 a of the contact 10.

The contactor 10 used in the fifth embodiment of the present invention uses a copper plate which is a conductive material having a weak spring property. However, any other conductive material having a strong spring property may be used to implement the present invention. Obviously, the same effect as the contact 10 used in the fifth embodiment can be obtained.

Embodiment 6 FIG.
In the connection devices according to the first to fifth embodiments, one contact is accommodated in the insulating case. However, a plurality of contacts may be provided. In this case, an insulating case that can accommodate a plurality of contacts may be used. For example, in the case of an insulating case that accommodates two contacts, the inside of the case may be divided into two stages, and the contacts may be accommodated in each of the divided stages. Hereinafter, the sixth embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 13 is a perspective view of a contact used in Embodiment 6, and FIG. 14 is a perspective view of a connection device using the contact. In addition, in each part in FIG. 13 and FIG. 14, the same code | symbol is provided to the same part thru | or a corresponding part as FIG. 1 thru | or 12, and the description is abbreviate | omitted.

As shown in FIG. 13, the contact used in the sixth embodiment of the present invention is a rivet hole (not shown) for connection penetrating through the contact (see FIG. 10) to which the elastic member 15 used in the fifth embodiment is attached. A rivet is inserted into each of the rivet holes by sandwiching a U-shaped conductor spacer 10c (not shown) having a rivet hole (not shown) between the two

contacts

10a and 10b provided with 18 is inserted and connected. At this time, the two

contacts

10a and 10b can be rotated about the rivet 18 as a rotation axis so that the fifth slit portion 11e of each

contact

10a and 10b can be opposed to the blade 30 together. It has become. The conductor spacer 10c is for preventing the elastic members 15 used in the

contacts

10a and 10b from contacting each other, and the thickness thereof is larger than twice the thickness of the elastic member 15. ing.

As shown in FIG. 14, the connection device 1 used in the sixth embodiment of the present invention includes two

contacts

10a and 10b to which the elastic member used in the sixth embodiment is attached. It is what was contained in. Thus, according to the sixth embodiment, since the two

contactors

10a and 10b are provided in one connection device 1, the energization capacity becomes larger than that in the case of one. Further, since the rivet 18 is used for the connection, the fifth slit portions 11e of the

respective contacts

10a and 10b can be rotated together so as to face the blade 30. As a result, the blade 30 can be easily moved to the first position. It has a special effect that it can be inserted into the 5-slit part 11e. In other words, when the connecting device 1 is assembled, the rivets 18 can be easily passed through the rivet holes without having to align the directions of the fifth slit portions 11e formed on the two

contacts

10a and 10b with each other. There is a special effect that the connecting device 1 capable of inserting the blade 30 into the fifth slit portion 11e is obtained.

In the sixth embodiment, the two contactors 10 are fixed by one rivet 18, but the diameter of the rivet hole is made larger than the diameter of the shaft portion of the rivet 18, so that it can be stopped by a plurality of rivets. Since each contact 10 can be swung, the blade 30 can be easily inserted into the fifth slit portion 11e. Further, although the number of the contacts 10 is two, it is obvious that a similar connection device can be obtained even when three or more contacts 10 are used.

Embodiment 7 FIG.
Hereinafter, the seventh embodiment of the present invention will be described in detail with reference to the drawings. FIG. 15 is an external view of a functional unit according to Embodiment 7 of the present invention, and FIG. 16 is an external view of a control center used in Embodiment 7 of the present invention.

As shown in the perspective view of FIG. 15 (a), the functional unit 40 used in the sixth embodiment of the present invention has a circuit breaker operation handle 41 for wiring on the front side to control opening and closing of the motor circuit and its protection. An operation display device 42 for performing display, motor control, and the like is provided. A main circuit device such as a circuit breaker (not shown) and an electromagnetic contactor (not shown) and a control circuit device (not shown) such as a current sensor and a relay are accommodated inside. As shown in the bottom view of FIG. 15 (b), on the back of the functional unit 40, a connection for connecting the functional unit 40 and three blades 30 of a control center 50 (not shown) for controlling the external three-phase alternating current is connected. Three devices 1 are arranged. As the connection device 1, the connection device 1 described in the first to sixth embodiments is used.

As shown in FIG. 16, a plurality of functional units 40 are attached to each level of a control center 50 that is divided into multiple stages, and can be pulled out by opening and closing a front door 51 provided in a metal box 52. It is stored.

According to the sixth embodiment of the present invention, since the connection unit 1 that is thin and has a large energization capacity is used for the functional unit 40, the functional unit 40 can also be thinned. -It is possible to obtain a smooth control center.

Claims

In a connection device in which a contact formed with a connection portion connected to a first conductor and a pair of legs that hold the second conductor is housed in an insulating case, a slit is formed in the conductive leaf spring. A connecting device characterized in that the pair of leg portions are formed by inserting.
The connecting device according to claim 1, wherein an elastic member that narrows the width of the slit is attached to the contact.
In a connection device in which a contact formed with a connection portion connected to a first conductor and a pair of legs for holding a second conductor is housed in an insulating case, a slit is formed in a conductive flat plate. Thereby forming the pair of legs,
A connection device, wherein an elastic member that narrows the width of the slit is attached to the contact.
The connecting device according to any one of claims 1 to 3, wherein a base portion of the slit is a curved surface.
4. The connection device according to claim 1, wherein a base portion of the slit is terminated with an elliptical hole.
4. The connection device according to claim 1, wherein the slit has a Y shape.
4. The connection device according to claim 1, wherein a contact portion having a shape in surface contact with the second conductor is formed on a surface facing each of the pair of leg portions. *
The connecting device according to claim 7, wherein a guide portion that guides the second conductor to the contact portion is formed on the leg portion.
The connecting device according to claim 8, wherein a stepped portion having a groove is formed in the leg portion.
The elliptical ring member is bent so as to be bent in a U-shape at a substantially central portion in the longitudinal direction, and an elastic member formed so as to be bent in a U-shape when viewed from the side and the plane is attached to the contact. The connection device according to claim 2, wherein:
4. The connection device according to claim 1, wherein a plurality of contacts are housed in one insulating case.
4. The connection device according to claim 1, wherein a plurality of contacts connected by rivets and having the rivet as a rotating shaft are housed in one insulating case.
13. A control center comprising a functional unit comprising the connection device according to claim 1.