JPH0113374Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention generally relates to a release type electromagnet that can be used as a tripping device in a switch or circuit breaker of electrical equipment.

Conventionally, in this type of open-circuit electromagnet, a guide hole is generally provided in the movable core, and a small-diameter guide rod member provided on the fixed core side is inserted into the guide hole, or a small-diameter guide rod member provided on the fixed core side is inserted into the guide hole. A guide rod member is formed, and this guide rod member is inserted into a guide hole provided on the fixed iron core side to smoothly slide the movable iron core into the fixed iron core from the suction position to the release position. However, by providing a small diameter guide hole in the movable or fixed core in this way, it is not possible to sufficiently remove foreign matter such as dust and chips that adhere to the inside of the guide hole after fabrication. During use, deposits accumulate on the adsorption surface of the iron core, causing a significant deterioration of the electromagnet's attraction characteristics.As part of the adsorption surface is used to process the guide rod and guide hole, the effective area of the adsorption area is limited. There were disadvantages such as being downsized and increasing costs.

Therefore, the main object of this invention is to provide an open-circuit electromagnet which eliminates the above-mentioned drawbacks of the prior art and reduces costs.

To summarize this idea, a guide member for the outer periphery of the movable core is integrated into a part of the permanent magnet supporter that supports permanent magnets on both sides of the movable core, so that the movable core can slide smoothly. It is a shaped electromagnet.

The above-mentioned objects and other objects and features of the present invention will become more apparent from the following detailed description along with the accompanying drawings.

As shown in FIGS. 1 and 2, a magnetic frame is formed by a U-shaped frame 1 made of a magnetic material and a lid frame 2,
One end of the fixed iron core 3 is attached to the narrow side of the glyph frame 1,
A tripping coil 4 is wound around the fixed core 3 via a coil bobbin 5. The movable core 6 has a rod-shaped portion 6a at one end corresponding to the other end of the fixed core 3, the movable core 6 is provided with an enlarged body portion 6b in the center, and the other end 6c is again formed into a rod-shape, and the lid frame 2 The end portion thereof is connected to an actuating lever 8 through a through hole 2' and a rubber seal 7.

A pair of permanent magnets 9, 9' are connected to the body 6 of the movable iron core 6.
These permanent magnets 9, 9' are provided on one side (the fifth A permanent magnet is inserted through the permanent magnet insertion hole 10a provided from the back side of the drawing, and is held between the window frame 10b and the spacer 11. A guide hole wall 10c of the movable core 6 is integrally formed at the end of the permanent magnet supporter 10, 10' on the fixed core side so as to surround the rod-shaped portion 6a of the movable core 6. The permanent magnet supports 10, 10' are each mounted in the U-shaped frame 1 via a spacer 11 made of a magnetic material. That is, permanent magnets 9, 9'
Due to the magnetic flux generated, the movable core 6 moves to the fixed core 3.
The magnetic circuit is configured to form a closed loop when in contact with the In addition, dustproof covers 12, 1
2' is preferably provided.

The actuating lever 8 is supported by an actuating lever support member (not shown) with a rotating shaft 13 as a fulcrum, and is connected to a movable iron core 6 and a shaft 14 at one end of the actuating lever 8, and is connected to a spring hanging pin 15 at the other end. One end of the tripping spring 16 is installed. The other end of the tripping spring 16 is a U-shaped spring support member 1 attached to the dustproof cover 12.
Adjustment screw 18 passing through the guide hole provided in 7
The spring mounting piece 19 is screwed onto the spring mounting piece 19, which is slidably provided on the spring mounting piece 19, and normally acts in the direction of separating the movable core 6, and the tripping spring is removed by turning the adjustment screw 18. It is configured so that 16 loads can be adjusted. Further, it is connected to a tripping member (not shown) so that when the operating lever 8 rotates to the tripping position, an opening/closing mechanism such as a switch or a circuit breaker is collapsed to open the circuit.

In the above configuration, as shown in FIG.
working in a magnetic circuit that returns to the permanent magnets 9, 9' through
It has sufficient strength to hold the movable core 6 to the fixed core 3 in the suction position.

Now, the above-mentioned permanent magnets 9, 9' are connected to the tripping coil 4.
When a direct current is energized in a direction that cancels out the magnetic flux generated by is the rotation axis 13
The device rotates clockwise about the fulcrum and operates the tripping member of the switch or circuit breaker to open the circuit.

As mentioned above, this invention includes a magnetic frame made of a magnetic material, a pair of fixed iron core 3 and a movable iron core 6 corresponding to each other within this magnetic frame, and a pair of fixed iron cores 3 and a movable iron core 6 that move in the direction of separation from the fixed iron core 3. A tripping spring 16 installed directly or indirectly on the movable core 6 to act on the movable core 6 and a tripping spring force applied to the movable core 6 in contact with the fixed core 3 cause the fixed and movable cores 3 and 6 to interact with each other. A pair of permanent magnets 9 and 9' are placed on both sides of the movable core 6 to form a magnetic circuit that attracts and holds the core, and a fixed core is wound so as to energize the magnetic flux created by these permanent magnets 9 and 9'. The magnetic path is rectangular so as to correspond to the flat surface of the enlarged body portion 6b of the movable core 6 so that the magnetic flux of the permanent magnets 9 and 9' can be effectively utilized. permanent magnet 9,
In order to arrange and hold the wide surface of the movable core 6, a window frame 10b is formed on the side of the enlarged body 6b of the movable core 6, a permanent magnet insertion opening 10a is formed on the opposite surface of the window frame 10b, and a fixed core 3 is provided. A pair of permanent magnet supports 10, 1 each having a guide hole wall 10c formed at the side end and divided in the axial direction of the movable iron core 6.
0' is placed on the outer periphery of the movable iron core 6, and the permanent magnets 9, 9' are inserted into the window frame 10 from the permanent magnet insertion port 10a.
b, and is fixed between the window frame 10b and the U-shaped frame 1 via a spacer 11 made of a magnetic material, and is fixed to the fixed core 3 of the movable core 6.
The adsorption and separation operations are performed because the outer periphery of the movable core 6 can perform smooth sliding motion using a part of the permanent magnet supporter as a guide. Compared to a structure in which a guide hole is provided and a guide rod member protrudes from the other suction surface, there is no need to process the suction surface, which requires high strength, and the manufacturing cost is low.

Furthermore, since there is no need to provide a guide hole in the movable core or the fixed core, dirt, chips, etc. in the guide hole will not accumulate on the suction surface during use, and a decrease in suction force can be prevented.

Furthermore, since it is not necessary to provide a guide hole or the like on the suction surface of the movable iron core or the fixed iron core, the suction area can be effectively secured, and therefore the movable iron core or the fixed iron core can be downsized.

This invention produces various practical effects as described above. When the permanent magnet supports are molded from synthetic resin, the pair of opposing permanent magnet supports 10 and 10' can of course be molded integrally, and other parts such as guide parts can also be molded. Coil bobbin 5 of tripping coil 4
etc. can be molded into one piece to reduce costs.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a front sectional view of a release type electromagnet, Figure 2 is a side sectional view taken along the - line in Figure 1 in the direction of the arrow, and Figures 3 and 4 are taken along the - line and - line in Figure 1, respectively. FIG. 5 is a sectional view taken along the arrow direction, and FIG. 5 is a perspective view illustrating the main parts. In the figure, 1... U-shaped frame, 2... Lid frame, 3... Fixed core, 4... Trip coil, 6... Movable core, 8
...Actuation lever, 9,9'...Permanent magnet, 10,
10'... Permanent magnet supporter, 11... Spacer,
12, 12'...Dustproof cover, 16...Tripping spring, 18...Adjustment screw.

Claims (1)

[Scope of utility model registration request] A magnetic frame formed of a magnetic material, a pair of fixed iron core and movable iron core corresponding within this magnetic frame,
The movable core overcomes the tripping spring force directly or indirectly installed on the fixed core, and the movable core is in contact with the fixed core, so that both cores attract and hold each other. It consists of a pair of permanent magnets placed on both sides of the movable core to form a magnetic circuit, and a tripping coil wound around the fixed core so as to energize the magnetic flux created by these permanent magnets in a direction that cancels out the magnetic flux created by the permanent magnets. A window frame formed on the enlarged body side of the movable core, a permanent magnet insertion opening formed on the opposite surface of the window frame, and a guide hole wall formed at the end on the fixed core side, A pair of permanent magnet supporters divided in the axial direction of the movable core are arranged on the outer periphery of the movable core,
An open type electromagnet device, characterized in that the permanent magnet is inserted toward the window frame through the permanent magnet insertion port and fixed between the window frame and the frame via a spacer made of a magnetic material.