JPS62123616A - Contact switchgear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a contact opening/closing device applied to relays, switches, contactors, etc.

[Background technology]

Conventionally, bounce arcs when closing the contacts of contact switching devices,
There was a problem in that contact welding occurred due to electromagnetic repulsion caused by the rush current and the accompanying arc. In contrast, it is conceivable to select a contact material that is resistant to welding. Current contacts use static-based internal oxidation systems, such as A
gCd0. These include Ag5nO□In20i and sintered materials such as HegWc and AgNj. However, although the welding resistance is improved, there is a drawback that the contact resistance is increased due to impurities present in Ag. A two-contact system using a high-melting-point arc contact and a low-resistance conductive contact is also conceivable, but it has the disadvantage of a complicated structure.

[Purpose of the invention]

An object of the present invention is to provide a contact opening/closing device that can ensure welding resistance with a simple configuration.

(Disclosure of the Invention) The present invention provides a movable contact having a fixed contact, a movable contact at the distal end that makes contact with and separates from the fixed contact, and a movable contact that holds the proximal end of the movable contact and causes the movable contact to elastically deform. an elastic body that allows the movable contact to contact the fixed contact and to rotate about the fixed contact with the movable contact in contact with the fixed contact; and an elastic body that is inserted through the movable contact. The movable contact is brought into contact with the fixed contact by having an insertion portion and pressing the movable contact with a pressing portion of the insertion portion, and the movable contact is brought into contact with the fixed contact while the movable contact is in contact with the fixed contact. a driving means that rotates about the fixed contact as a fulcrum; a first magnetic body provided at a position facing the pressing portion of the movable contact; and a first magnetic body provided on a side of the insertion portion facing the pressing portion. According to this invention, a second magnetic body is provided and faces the first magnetic body so as to surround the movable contact together with the first magnetic body. The base end is held by an elastic body, and after the movable contact contacts the fixed contact, the rotating contact rotates around the fixed contact as a fulcrum, so the movable contact can roll on the fixed contact after contacting the fixed contact. Therefore, even if contact welding occurs due to arcing due to bounce when closing the contact, the movable contact can be reliably separated from the fixed contact by the rotational moment of the movable contact.Especially when the first magnetic body and By providing a second magnetic body, an attractive force is obtained by the inrush current when the contact contacts, so the rotational moment of the movable contact can be increased, and the drive means is reliably resistant to welding against arcs caused by the inrush current. The driving force of the first magnetic body and the second magnetic body can be used to increase the contact pressure and make it more compact in response to inrush current caused by short-circuit accidents in the ON state. Since the contacts can be rolled, contact welding due to electromagnetic repulsion arc can be prevented.

As a result, welding resistance can be ensured with a simple configuration.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. In other words, this contact opening/closing device includes a fixed contact 1, a movable contact 3 having a movable contact 2 at its tip that contacts and separates from the fixed contact 1, and a base end 4 of the movable contact 3 that is held and elastic. The deformation enables the movable contact 2 to come into contact with the fixed contact 1 and the movable contact 3 to rotate about the fixed contact 1 with the movable contact 2 in contact with the fixed contact 1. It has an elastic body 5 and an insertion part 6 through which the movable contact 3 is inserted, and the movable contact 2 is brought into contact with the fixed contact 1 by pressing the movable contact 3 with a pressing part 7 of the insertion part 6. With the movable contact 2 in contact with the fixed contact 1, the movable contact 3
a driving means 8 for rotating the fixed contact 1 around the fixed contact 1; a first magnetic body 9 provided at a position facing the pressing part 7 of the movable contact 3; and the pressing part of the insertion part 7. A second magnetic body 10 is provided on the side opposite to the first magnetic body 9 so as to surround the movable contact 3 together with the first magnetic body 9 .

The fixed contact 1 is caulked and fixed to a fixed contact 11 by a pin portion 12, and the fixed contact 11 also serves as a terminal at an end.

The movable contact 2 has a peripheral edge formed into a curved surface so as to be easily rolled, and a pin portion 1 is attached to the movable contact 3.
It is caulked and fixed by 3.

The movable contact 3 is a rigid band-shaped body, and the movable contact 2 is provided at one end thereof. Note that a notch 3a (FIG. 3) for retaining is formed in the middle portion of the movable contactor 3.

The elastic body 5 is an electrically conductive plate spring bent into a substantially W-shape, and one end thereof is connected to the base end 4 of the movable contact 3.
The pin portion 14 is caulked and fixed to the pin portion 14. The other end of the elastic body 5 is held by being caulked to the terminal plate 15 by a pin portion 16. The movable contact 3 is held by the elastic body, and the elastic deformation of the elastic body 5 allows the movable contact 2 to rotate in the direction of contacting and separating from the fixed contact 1, and the movable contact 2 contacts the fixed contact 1. In this state, the movable contact 3 can rotate about the fixed contact 1 as a fulcrum.

The first drive stage 8 is an example of a drive section of a relay which will be described later, and the movable contact 3 is driven by the movable frame 17 thereof. The movable frame I7 has an insertion part 6 that is inserted through the middle part of the movable contact 3 and is cut out to be wider than the movable contact 3 in the rotating direction of the movable contact 3, and has a protrusion 19 formed at the bottom thereof. A pressing portion 7 for pressing the movable contact 2 of the movable contact 3 into contact with the fixed contact 1 is formed in a protrusion shape. The middle part of the movable contact 3 is passed through this insertion part 6, and the notch 3a of the movable contact 3 is inserted.
engages with the protrusion 19. As a result, movement of the movable contactor 3 in the longitudinal direction (direction from the distal end to the proximal end 4) is restricted by engagement between the notch 3a and the protrusion 19.

The first magnetic body 9 is formed into a plate shape from electromagnetic soft iron or the like, and is fixed by caulking a pin portion (not shown) into a mounting hole 3b provided on the surface of the movable contact 3 facing the pressing portion 7. (Figure 3). 9a is a notch that escapes the protrusion 19.

The second magnetic body 10 is made of the same material as the first magnetic body 9, but is formed in a U-shape, and is provided on the surface of the insertion part 6 facing the pressing part 7, so that the second magnetic body 10 and the first magnetic body 9 are made of the same material. The two magnetic bodies 10 are arranged so that the movable contact 3 can be surrounded by the second magnetic body 10 .

10a is a notch that escapes the protrusion 19.

Note that 20 is a stopper that restricts the maximum extension position of the elastic body 5, and also serves as a fulcrum for rotational movement when the movable contact 3 is in the open state.

The operation of this contact switching device will be explained.

FIG. 1 Fa) shows the off state in which the movable contact 2 is separated from the fixed contact 1. That is, the base end portion of the movable contact 3 is regulated by the elastic body 5 to the stopper 20, and the movable contact 3 is biased in the separation direction by the elastic body 5 to the first position.
The magnetic body 9 contacts the pressing portion 7 and is regulated.

FIG. 1 (bl) shows a state in which the movable frame 17 is being moved in the direction of the arrow by the drive means 8, and the movable contact 3 rotates about the stopper 20 of the base end 4 as a fulcrum, and the movable contact 2 It is in a state where it is in contact with the fixed contact 1.

At this time, the movable contact 3 is pushed by the pressing part 7, the base end 4 of the movable contact 3 is regulated by the stopper 20, and the movable contact 3 is moved in the longitudinal direction by the engagement of the protrusion 19 and the notch 3a. is regulated.

FIG. 2(b) shows that the movable frame 17 of the drive means 8 is shown in FIG.
This is a state in which the movable frame 17 has moved further to the final position.
The movable contact 3 rotates around the fixed contact 1 by the pressing part 7, and the movable contact 3 separates from the stopper 20 and presses against the elastic body
is elastically contracted. At this time, the movable contact 2 is connected to the fixed contact 1.
The contact welds are destroyed by the rotational moment of the movable contact 3.

FIG. 2 (al) shows the operating state when the movable contact 2 contacts the fixed contact 1 and an inrush current flows as shown in FIG. 1 (b) when a capacitor is connected to the load. That is, when an inrush current flows through the movable contact 3, the magnetic flux generated around the movable contact 3 flows through the first magnetic body 9 and the second magnetic body 9.
The magnetic body 10 is concentrated on the magnetic body 10, and an attractive force acts impulsively between the first magnetic body 9 and the second magnetic body 10, causing the movable contact 3 to rotate about the fixed contact 1 as a fulcrum. This operation is apparently the same as an increase in the driving force of the upper moving frame 17. In addition, contact welding occurs in the early stage of capacitor discharge, that is, several 100 μs.
Since this occurs in the following short period of time, welding failure is effectively carried out.

FIG. 4 shows the relationship between the spring load by the elastic body 5 and the attraction force by the relay with respect to the stroke of the movable frame 17. Ql is an attractive force characteristic, and the broken line portion indicates the attractive force between the first magnetic body 9 and the second magnetic body 10 due to the rush current. Q2 is the spring load characteristic. In order to release the welded contacts of the movable frame 17 in the initial contact state, the larger the attraction force W1 of the relay that drives the movable frame 17 is, the better. It can be seen that since the attraction force by the magnetic body 10 is added, the attraction force becomes substantially W2, and the rotational moment of the movable contactor 3 can be increased.

On the other hand, the opening/closing operation of the movable contact 2 is performed by the movable frame 1 of the driving means 8.
7 is carried out by the return movement in the opposite direction to the above. At this time as well, there is a rolling motion of the movable contact 2.

Figure 3 shows a relay. That is, 21 is the case, 22
is a cover, and 23 is a contact stand. The driving part of the relay is an electromagnet, 24 is its main body, 25 is a movable iron piece that is biased to return by a return spring 26, and 27 is a coil terminal. Further, the return spring 33 is housed in the guide part 31 of the contact base 23, and the movable frame 17 is supported by the return spring 33 and slidably guided by the guide part 31, and the hanging part 28 at one end is connected to the notch 23a of the contact base 23. The engaging recess 29 of the hanging portion 28 is engaged with the movable iron piece 25 .

Further, the terminal portion of the fixed contactor 11 and the terminal plate 15 are press-fitted into the groove 30 of the contact base 23, the stopper 2o is integrally formed with the contact base 23, and the elastic body 5 is also located on the contact base 23. Note that the coil terminal 27. The terminal portions of the terminal plate 15 and the fixed contact 11 protrude to the outside from the slit 32 of the case 21.

When current is supplied to the coil terminal 27 of this relay,
The movable iron piece 25 is attracted to the main body 24 by excitation of the main body 24 . Therefore, the movable frame 17 slides and the movable contactor 3 performs the above operation. Also, when the current is stopped, the return spring 26
and a movable contact 3 by the elastic body 5. Movable frame 17. The movable iron piece 25 returns to its original position and the contacts are opened.

As configured in this way, this contact switching device can prevent contact welding between the movable contact 2 and the fixed contact 1 due to the arc caused by the initial bounce when the movable contact 2 contacts the fixed contact 1 in FIG. Since the movable contact 2 rolls on the fixed contact 1 in the process of reaching FIG. In particular, the rotational moment of the movable contactor 3 is affected by the attractive force caused by the first magnetic body 9 and the second magnetic body 10, so that the driving means 8
The driving force of the device can be reduced, and the size can be reduced. Therefore, if the movable contact 2 and the fixed contact 1 are simply provided with magnetic material, contact pressure will not work and it will be difficult to reduce contact welding due to bounce arc at the initial stage of contact, but this embodiment can reliably destroy contact welding. .

In addition, when a short-circuit accident occurs and the circuit breaker is activated in the ON state, a short-circuit current flows on the load side until the circuit breaker completes disconnection, but the electromagnetic repulsion between the contacts due to this inrush current causes By pressing the movable contact 2 with the attractive force of the first magnetic body 9 and the second magnetic body 10 and rolling the movable contact 2, it is possible to prevent contact welding due to electromagnetic repulsion arc.

A second embodiment of the invention is shown in FIGS. 5-9.

That is, in this contact opening/closing device, a clapper-type electromagnet is used as the driving means 8, a leaf spring whose tip is bent into an arc shape is used as the elastic body 5, and a movable iron piece 25 is directly used in place of the movable frame 17. Applied. In the movable iron piece 25, the second magnetic body 10 is integrally formed, but the pressing portion 7 is made of synthetic resin and molded on the movable iron piece 25 at the same time. Further, FIG. 6 corresponds to FIG. 1, and FIG. 7 corresponds to FIG. 2, respectively. The rest is the same as the first embodiment, and parts having the same functions are given the same reference numerals.

In the present invention, the elastic body 5 is made of a conductive material to establish electrical continuity between the movable contact 3 and the terminal plate 15, but a separate lead wire is used to connect the movable contact 3 and the terminal plate 15. You may also connect them. Further, although the elastic body 5 is a substantially W-shaped or arc-shaped leaf spring, its shape is not limited. Any material may be used as long as the base end side of the movable contact 3 can be rotated after contacting the fixed contact 1.

〔Effect of the invention〕

According to this invention, the base end of the movable contact is held by an elastic body, and after the movable contact contacts the fixed contact, the rotary contact rotates about the fixed contact as a fulcrum, so that the movable contact is fixed. After touching the contact, roll over the fixed contact. For this reason,
Even if contact welding occurs due to arcing due to bounce or the like when the contact is closed, the movable contact can be reliably separated from the fixed contact by the rotational moment of the movable contact. In particular, by providing the first magnetic body and the second magnetic body, an attractive force can be obtained by the inrush current when the contact contacts, so the rotational moment of the movable contact can be increased, and the resistance to arcing caused by the inrush current can be increased. Welding is reliable, the driving force of the driving means can be reduced, and the size can be reduced. Furthermore, the contact pressure is increased by the attraction force of the first magnetic body and the second magnetic body against inrush current caused by a short circuit accident in the ON state, and the movable contact can be rolled, thereby preventing contact welding due to electromagnetic repulsion arc. can do.

As a result, there is an effect that welding resistance can be ensured with a simple structure.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the operating state of the first embodiment of the present invention from the OFF state to the initial closing state, and FIG. 2 is an explanatory diagram of the ON state from the initial closing state to the final position of the movable contact. , Fig. 3 is an exploded perspective view of the relay, Fig. 4 is a characteristic diagram of the spring load and attraction force with respect to the stroke of the movable frame, Fig. 5 is a sectional view of the second embodiment, and Fig. 6 is from the OFF state to the ON state. An explanatory diagram of the operating state leading to the initial state, Figure 7 is an explanatory diagram of the ON state from the initial closing state to the final position of the movable contact, Figure 8 is an exploded perspective view of the relay, and Figure 9 is the movable iron piece. FIG. DESCRIPTION OF SYMBOLS 1... Fixed contact, 2... Movable contact, 3... Movable contact, 4... Base end part, 5... Elastic body, 6... Insertion part, 7... Pressing part , 8... driving means, 9... first
magnetic material, 10...second magnetic material Fig. 4 Fig. 3 Fig. 5

Claims (1)

[Claims] a movable contact having a fixed contact, a movable contact having a movable contact at a distal end portion that makes contact with and separates from the fixed contact; a proximal end portion of the movable contact being held so that the movable contact contacts the fixed contact by elastic deformation; an elastic body that allows the movable contact to rotate about the fixed contact while the movable contact is in contact with the fixed contact; and an insertion portion through which the movable contact is inserted; By pressing the movable contact with a pressing portion of the movable contact, the movable contact is brought into contact with the fixed contact, and the movable contact is rotated about the fixed contact as a fulcrum while the movable contact is in contact with the fixed contact. a driving means, a first magnetic body provided at a position facing the pressing part of the movable contact, and a first magnetic body provided at a side facing the pressing part of the insertion part together with the first magnetic body; A contact opening/closing device comprising: a second magnetic body facing the first magnetic body so as to surround a movable contact.