JPS6017794Y2 - conductive contact device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conductive contact device used in a main circuit disconnection section of a control center, a general disconnector, etc.

First, in a control center, etc., a control unit that appropriately combines control equipment such as a circuit breaker and an electromagnetic contactor is housed in multiple stages within a panel frame, and these units are constructed so that they can be pulled out from the panel frame. As the control unit moves along this pull-out direction, the movable side contact provided on the control unit side is brought into contact with and separated from the fixed side contact placed at the rear inside the panel frame, and the main circuit is disconnected. It consists of

Here, the main circuit disconnection section includes a power supply side disconnection section that connects the vertical bus bar and the control unit, and a load side disconnection section that connects the control unit and an external cable.

The general configuration of the load-side disconnecting section will be described below.

FIG. 1 shows a control unit 3 that houses the wiring breaker 1, electromagnetic contactor 2, etc., and uses a band-shaped conductor 5 as a movable disconnection section 4a.

On the other hand, a unit storage chamber 8 partitioned by a shelf board 7 is formed in the panel frame 6 shown in FIG.
b is provided and brought into contact with and separated from the movable side disconnecting section 4a.

The general configuration of such a main circuit disconnection section is shown in Figures 3a and b.
It is as shown in .

That is, 11 is a U welding contact provided on the fixed side contact part 4b,
It comes into contact with and separates from the band-shaped conductor 5, which is a movable side contact.

This U welding contact 11 is formed by forming a plate-like conductor into a U-shape, and further narrowing both inner surfaces of the opening to form a contact portion 1 with the strip-like conductor 5.
1a, and in order to apply contact pressure to this contact portion 11a, the U welding contact 11 is made of a conductive material with spring properties.

Alternatively, although not shown, the strip conductor 5 may be made of other spring material.
may be sandwiched.

Reference numeral 12 denotes a support base for supporting the U welding contact 11, and has a groove 13 into which the U welding contact 11 is mounted.

Figure 4 is a cross section IV-IV of Figure 3, and shows the U welding contact 11.
One end of a connecting conductor 14 is connected to the bottom of the connector, and a screw 15 for connecting an external cable is attached to the other end.

In the above configuration, when the control unit 3 shown in FIG. 1 is inserted into the unit storage chamber 8, the band-shaped conductor 5 is inserted from above in FIG. 4 and is mounted to a position where it contacts the contact portion 11a.

In this state, if a large current flows through the contact portion 11a due to a short-circuit accident, etc., a large electromagnetic repulsion force is generated in the contact portion 11a in proportion to the passing current, causing the contact portion 11a to separate, arc, and be damaged. There is a risk.

In order to prevent this, it is necessary to apply a large contact pressure using spring pressure to overcome the electromagnetic repulsive force.

However, in this case, a large operating force is required for this approach and separation operation, and a large amount of effort is required to insert the control unit into the panel frame.

Further, since an external cable is connected to the connection conductor 14, it is necessary to configure the connection conductor 14 so that it can be attached and detached from the front of the panel frame 6 using a screwdriver or the like.

In this case, the cable may be shaken by the electromagnetic force caused by the short-circuit current described above, and the connecting conductor 14 may be twisted.

The purpose of the present invention is to provide a conductive contact device that reduces electromagnetic repulsion without increasing insertion force, maintains a sufficient contact state at all times, and facilitates attachment and detachment of external cables. be.

The present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 5 shows the fixed side contact portion 20 of the conductive contact device of the present invention.

Reference numeral 11 denotes a U welding contact made of a band-shaped conductive material with spring properties, and its opposing ends are bent into a dogleg shape to narrow the distance as shown in Fig. 3 to form a contact portion 11a. is forming.

Reference numeral 21 is a U-shaped conductor, and a protrusion 21c that protrudes laterally is formed at the tip of the image, and the upper end of each protrusion 21c is bent at a right angle between the protrusions 21c. An overlapping portion 21f is formed, and a fixing hole 21a and a cable connection hole 21b are provided in this overlapping portion 21f to form a terminal surface.

These U welding contacts 11 and U-shaped conductors 21 are the U welding contacts 1
1 is placed inside, and the bottom parts 11c and 21c of each other are electrically connected by welding or bolting, etc., and a fixed side contact part 2 is formed.
0 is formed.

FIG. 6 shows a fixed-side disconnection section 4b constructed by housing the contact section 20 in a support base 22, and FIG. 7 shows its cross section ---.

23 is a screw for fixing the contact portion 20 to the support base 22, 24 is a screw for connecting an external cable, and a nut 25 embedded in the support base 22 is used to tighten a terminal of the external cable (not shown).

In FIGS. 1 and 2, when the control unit 3 is inserted into the unit storage chamber 8, the strip conductor 5 fixed to the movable disconnection section 4a on the control unit 3 side is inserted into the fixed disconnection section 4.
It is inserted into the U-shaped contact 11 housed in the U-shaped contact 11 and comes into contact with its contact portion 11a.

FIG. 8 is a diagram illustrating the contact state and the electromagnetic repulsion effect of the device of the present invention, in which the current i is applied to the contact portion 11a', both bottom portions 11c of the U-shaped welding contact 11, and the U-shaped conductor as shown by arrows. 21 and flows to an external cable (not shown).

At this time, the contact part 11a itself causes contact repulsion and tries to separate, but from the contact part 11a of the U welding contact 11 to the bottom 1
Since the current flowing through 1c21c is in the same direction on the left and right sides, it acts as an attractive force, contrary to the repulsion at the contact point.

Furthermore, the current flowing in the U-shaped welding contact 11 and the U-shaped conductor 21 has opposite directions for each left side and for each layer, and a repulsive force is generated in this portion.

In this case, as shown in FIG. 6, the opposing tips of the U-shaped conductors 21 are pressed by the partition walls 22a of the support stands 22 located on the outside of each of them, and are prevented from moving away from each other. It is designed not to open outward.

Therefore, all of the electromagnetic repulsive forces act in the direction of closing the U welding contact 11, that is, in the direction of pressing both liquid contact portions 11a against the band-shaped conductor 5.

Therefore, even if an excessive current i flows due to an accident or the like, the contact repulsive force is greatly reduced and the contact separation phenomenon does not occur.

Further, as shown in FIG. 7, since the nut 25 is embedded in the support base 22, the U-shaped conductor 21 will not be twisted due to deflection due to attraction and repulsion of electromagnetic force between external cables.

Furthermore, the external cable mounting screw 24 of the fixed side disconnecting section 4b is mounted so as to face the front of the panel frame 6, making it easy to connect the external cable.

In the embodiment shown in FIG. 9, the U-shaped conductor 21 is connected to 21d and 21
This structure is formed by dividing the conductor into two parts and overlapping each other with the bent parts, and the same effect as the above embodiment can be obtained.Moreover, the amount of conductor used can be reduced by improving the part closure during manufacturing.

As described above, according to the present invention, a U-shaped conductor is fixed to the outside of a U-shaped welding contact, and the electromagnetic repulsion force that acts between the contact and this U-shaped conductor is utilized, so that the contact will not be affected by excessive current in the event of an accident. This U-shaped groove body can be bent to form a terminal block for connecting external cables, and the screws can be operated from the front of the panel frame, making it easy to connect cables.

[Brief explanation of the drawings] Figures 1 and 2 are perspective views illustrating the conventional device, and Figure 3 a.
Xb is a plan view and side view of the conventional device, and Figure 4 is Figure 3 I.
5 is a perspective view of a contactor used in the present invention, FIG. 6 is a plan view showing an embodiment of the conductive contact device according to the present invention, and FIG. 7 is a sectional view taken along line 6 FIG. 8 is an explanatory diagram of the electromagnetic force generated in the contactor of the present invention, and FIG. 9 is a perspective view showing another embodiment of the present invention. 3...Control unit, 4a, 4b...
Disconnection section, 5... Strip conductor, 6... Panel frame, 8... Storage chamber, 11... U welding contact, 20... ...Contact part, 21...U
Shaped groove body, 22...Support stand.

Claims (1)

[Scope of utility model registration request] a fixed-side U welding contact made of a band-shaped conductive material with spring properties, and whose opposing tips are bent into a dogleg shape to narrow the distance between them to form a contact part; It is constructed in a U shape using a band-shaped conductive material, the U welding contact is arranged inside, the bottoms of each are conductively coupled, and a protrusion is formed by protruding laterally from both tips, respectively. A U-shaped conductor with a terminal surface for connecting an external cable formed therebetween, and a partition wall to which the U-shaped conductor is fixed and which prevents opposing ends of the U-shaped conductor from moving away from each other. A conductive contact device comprising a support base and a band-shaped conductor that approaches and separates from the contact portion of the U welding contact.