JPH0624120Y2 - Release type electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a release type electromagnetic device, and more particularly to reduction of variation in release current among products.

[Conventional technology]

FIG. 3 is a perspective view of a conventional release type electromagnetic device, and FIG.
FIG. 5 is a side view of the release type electromagnetic device seen from the slider side in the figure, and FIG. 5 is an axial sectional view of an electromagnet device of the release type electromagnetic device of FIG.

In the figure, (1) is an electromagnet device, (101) is a coil wound around a bobbin (102), and (103) is a plunger inserted therein, which is at a non-release position and a release position as will be described later. It is axially movable between the positions.
Reference numeral (104) is a U-shaped yoke made of a magnetic material, which can be easily and inexpensively manufactured by bending one plate into a U-shape, and the coil (101) is provided inside the U-shaped yoke (104). It is housed in. (105) is a permanent magnet that attracts the plunger (103) into the bobbin (102) against the force of a release spring described later, and (106) is the plunger (103) hits the permanent magnet (105) and damages it. A fixed iron core (107) for preventing the heat generation is combined with a U-shaped yoke (104) to form a U-shaped yoke (10).
4), a permanent magnet (105), a fixed iron core (106), and an end yoke constituting a magnetic path that passes through the plunger (103), the end yoke (107) having the plunger (103) penetrating therethrough. Guide hole (1
08) has been formed.

(2) is a support frame that supports the electromagnet device (1), (3) is a pin (4), (5) fixed to the support frame (2), and the non-release position and the arrow (6) Slider (actuated member) supported so as to be able to reciprocate between the release position and the release position.
The pin (4) is in sliding contact with the upper surface (301) of the slider (3), and the pin (5) is a long hole (30) formed in the slider (3).
Guide the slider (3) in sliding contact with 2). The release position is defined by the plunger (103) hitting a stopper (not shown). (7) is a support frame by pins (8)
The release spring attached to (2) allows the protrusion (3
03) to constantly urge the slider (3) in the releasing direction of the arrow (6).

(9) is provided between the slider (3) and the plunger (103), and one end (901) is pivotally supported by the pin (902) on the projecting end (109) of the plunger (103), and the middle portion (903). Is a transmission member pivotally supported by the pin (8), and the end surface (304) of the slider (3) is in contact with the other end (904) of the transmission member (9) by the action of the release spring (7). (1
0) is a twist spring wound around a pin (8), one end of which is locked to a support frame (2) and the other end of which is locked to a transmission member (9), which is used during resetting (plunger (103)). It has a weak spring force that assists the attraction force of the permanent magnet (105) when returning to the attraction position. In addition, (110) is a movable suction surface formed by the inner end surface of the plunger (103), and (1)
Reference numeral 11) is a fixed-side suction surface formed by the surface of the transfer yoke (106) facing the plunger (103).

Since such a release type electromagnetic device is used, for example, for tripping an electric leakage or a breaker, the operation will be described in that case. 3 to 5 are all coils (101)
Shows a non-releasing state in which the plunger is not biased, and the movable attraction surface (110) of the plunger (103) has a permanent magnet (10).
5) and the action of the spring (10) overcome the force of the release spring (7) and are attracted to the fixed-side attraction surface (111) to the non-release position, and the slider (3) is moved through the transmission member (9). Holds in non-release position. When electric leakage occurs in this state, an electric current flows through the coil (101) due to an electric leakage signal, the magnetic force of the permanent magnet (105) is canceled by the magnetic force of the coil (101), and the plunger (103) is released.
By the action of (7), the slider (3) is driven to the release position in the release direction of the arrow (6). At this time, the plunger (10
Also in 3), the movable suction surface (110) is driven to the release position separated from the fixed suction surface (111) via the transmission member (9). The movement of the slider (3) opens and closes an opening / closing contact (not shown) to cause electric leakage or tripping.

A reset mechanism (not shown) is usually provided for resetting and the slider (3) is operated by operating this reset mechanism.
When the plunger is moved toward the non-releasing position against the force of the release spring (7), the plunger (103) is fixed by the force of the spring (10) and the attractive force of the permanent magnet (105).
Adsorbed in 6).

[Problems to be solved by the invention]

The conventional release type electromagnetic device is configured as described above, and the magnitude of the release current flowing through the coil (101) to release the release type electromagnetic device depends on the strength of the release spring (7) and the accumulation of manufacturing error of each part. As a result, there was a problem that there were variations among products.

The present invention has been made in order to solve such a problem of the conventional one, and an object thereof is to provide a release type electromagnetic device capable of reducing the variation in the release current between products.

[Means for solving problems]

In the release type electromagnetic device according to the present invention, a recess is formed in the fixed iron core, and the adjusting screw is inserted into the recess through the screw hole formed in the yoke and the permanent magnet.

[Action]

In this invention, by adjusting the amount of the adjusting screw rushing into the recess of the fixed iron core, it is possible to adjust the amount of the magnetic flux of the permanent magnet that bypasses the plunger and passes through the adjusting screw. The magnetic flux and thus the release current can be adjusted.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is an axial sectional view of an electromagnet device of a release type electromagnetic device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electromagnet device of FIG. The same reference numerals are given and the description thereof is omitted.

In the figure, (104A) is a U-shaped yoke corresponding to the conventional one (104), and a screw hole (113) is formed in its bottom (112) in alignment with the plunger (103). (105A) is a permanent magnet corresponding to (105), (106A) is a fixed iron core corresponding to (106), and the permanent magnet (10A) of this fixed iron core (106A) is
A recess (114) is formed on the surface facing 5A). (115) is an adjusting screw, and this adjusting screw (11
5) is screwed into the screw hole (113), and the permanent magnet (1
It is adapted to be thrust into the recess (114) through 05A). Therefore, the permanent magnet (105A) is provided with an adjusting screw insertion hole (116) aligned with the screw hole (113) and the recess (114). (11
7) is a nut that is screwed with the adjusting screw (115).

Therefore, by providing the adjusting screw (115) as described above, a part of the magnetic flux of the permanent magnet (105A) bypasses the plunger (103) and the adjusting screw (115) into the recess (114). By adjusting the plunge amount of this, this bypass amount, and by extension, the plunger (103)
It is possible to adjust the magnitude of the magnetic flux of the permanent magnet (105A) passing through, and thus also the magnitude of the release current flowing in the coil (101) to cancel this flux. That is, the adjusting screw (11
The release current of each product can be adjusted by adjusting the amount of rushing into the recess (114) of 5), and variations in the release current between products can be eliminated or reduced.

In addition, in the above-mentioned embodiment, in order to insert the adjusting screw (115), the adjusting screw insertion hole (11) is formed in the permanent magnet (105A).
6) was formed, for this purpose a permanent magnet (105
A) may be divided into a plurality of pieces, for example, two pieces, and these pieces may be arranged with a space enough to pass the adjusting screw (115).
A tubular yoke may be used instead of the U-shaped yoke (104A). Furthermore, the release type electromagnetic device of the present invention can be used not only for electric leakage and disconnection but also for other purposes, and the actuated member also takes an appropriate form other than the slider (3) depending on the application. It is profitable.

[Effect of device]

As described above, according to the present invention, it is possible to eliminate or reduce the variation of the release current between the products by the extremely simple structure of providing the adjusting screw for bypassing a part of the magnetic flux of the permanent magnet to the plunger. .

[Brief description of drawings]

FIG. 1 is an axial sectional view of an electromagnet device of a release type electromagnetic device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the electromagnet device of FIG. 1, and FIG. 3 is a conventional release type electromagnetic device. FIG. 4 is a perspective view, FIG. 4 is a side view seen from the slider side in FIG. 3, and FIG. 5 is an axial sectional view of an electromagnet device of the release type electromagnetic device of FIG. In the figure, (101) is a coil, (102) is a bobbin, (103) is a plunger, (104A) is a yoke, (105A) is a permanent magnet, (106A) is a fixed iron core, and (112) is a yoke (104A). Bottom, (11
3) is a screw hole, (114) is a recess, and (115) is an adjusting screw. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A coil wound around a bobbin, a yoke for accommodating the coil, a plunger movable in the bobbin in an axial direction, a release spring constantly acting in a direction in which the plunger protrudes from the bobbin, and the plunger. A permanent magnet that is arranged opposite to the inner end surface of the bobbin and that constantly attracts the plunger into the bobbin by overcoming the action of the release spring, and a fixing that is arranged on the permanent magnet opposite the inner end surface of the bobbin of the plunger. Equipped with an iron core,
In a release type electromagnetic device in which the attraction force of the permanent magnet is canceled by energizing the coil so that the plunger is projected from the bobbin by the release spring, the bobbin inner end face of the plunger of the yoke is opposed. A screw hole is formed at a position and a recess is formed on the surface of the fixed iron core facing the permanent magnet by aligning with the screw hole, and an adjusting screw screwed into the screw hole is passed through the permanent magnet to the recess. A release type electromagnetic device characterized by being rushed into the place.