JPS5915049Y2 - release type electromagnetic device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a release type electromagnetic device in which the mover is normally attracted to a permanent magnet, and the mover is released from the attraction force of the permanent magnet when the electromagnetic coil is excited.

FIG. 1 is a side sectional view showing a conventional release type electromagnetic device.

FIGS. 2 and 3 are explanatory diagrams of the operation of a conventional release type electromagnetic device.

Corresponding parts in the figure are designated by corresponding reference numerals.

In Figures 1 to 3, 1 is a magnetic core, 2 is an electromagnetic coil wound around the magnetic core 1, and 3 is a frame that accommodates the magnetic core 1 and the electromagnetic coil 2, supports it at its bottom, and forms a magnetic path. 3a is an open end provided on the surface facing the bottom of the frame 3; 4a and 4b are 1 attached to the frame 3;
A pair of permanent magnets, 5 a guide pin whose one end passes through the magnetic core and the frame 3, and 6 a nut screwed onto one end of the guide pin 5 to fix the guide pin 5 to the magnetic core 1 and the frame 3; 7 is a movable element that slides along the guide pin 5; 7a is a flange provided in the middle of the movable element 7; and 8 is a spring mounted between the electromagnetic coil 2 and the flange 7a.

Figure 1 shows a state in which the electromagnetic coil 2 is not excited and the mover 7 is attracted to the left side of the figure by the magnetic force of a pair of permanent magnets 4a and 4b, overcoming the drag of the spring 8. .

In this state, the magnetic circuit is formed as shown in FIG.

That is, a magnetic circuit is formed as shown by the solid arrow in FIG. 2, and the movable element 7 is attracted to the left side in the figure.

Next, when the electromagnetic coil 2 is excited, a magnetic circuit is formed in the direction opposite to the solid arrow shown in FIG.
The force causes the magnet to slide along the guide pin 5 to the right in the figure against the attractive force of the permanent magnets 4a and 4b, as shown in FIG.

In the case shown in FIG. 2, permanent magnets 4 a and 4 b
A loss of magnetic force occurs due to the gap A between the flange portion 7a and the flange portion 7a.

Furthermore, unless the gap B between the open end 3a of the frame 3 and the movable element 7 is made large, a magnetic circuit as shown by the broken arrow will be formed and a loss of magnetic force will occur. Therefore, the guide pin 5 is required.

Therefore, it is necessary to machine a hole for inserting the guide pin 5 into the movable element 7, which has the disadvantage that the number of component parts increases and the assembly becomes complicated.

This idea was made in view of the conventional drawbacks.

This idea will be explained below with reference to the drawings.

FIG. 4 is a side cross-sectional view showing one embodiment of the open-circuit electromagnetic device according to this invention.

5 and 6 are explanatory diagrams of the operation of the release type electromagnetic device according to this invention.

In the drawings, parts corresponding to those in FIGS. 1 to 3 are designated by corresponding reference numerals.

In Figures 4 to 6, 2 is an electromagnetic coil, 3 is a frame that houses the electromagnetic coil 2 and is installed on the bottom side and forms a magnetic path, and 3a is a surface facing the bottom of the frame 3. 4 is a permanent magnet installed in a hollow part surrounded by the inner wall of the electromagnetic coil 2 and fixed to the bottom of the frame 3; 7 is a permanent magnet whose one end is slidably supported on the inner wall of the electromagnetic coil 2; a movable element whose other end is slidably supported by the open end 3a;
Reference numeral 7a denotes a collar portion attached to the intermediate portion of the movable element 7, and its outer diameter is larger than the diameter of the opening of the open end portion 3a.

8 is a spring mounted between the collar portion 7a and the electromagnetic coil 2.

In the state shown in FIG. 4, the movable element 7 is attracted to the left side of the figure by the magnetic force of the permanent magnet 4, overcoming the elasticity of the spring 8.

In this state, the magnetic circuit is formed as shown in FIG.

That is, a magnetic circuit is formed as shown by the solid arrow in FIG. 5, and the movable element 7 is attracted to the left side in the figure.

Next, when the electromagnetic coil 2 is excited, a magnetic circuit is formed in the direction opposite to the solid arrow shown in FIG.
Against the attractive force of the permanent magnet 4, one end slides against the inner wall of the electromagnetic coil 2, and the other end slides against the open end 3a of the frame 3, moving to the right side in the figure. Then, as shown in FIG. 6, the collar 7a comes into contact with the inner wall surface of the open end 3a of the frame 3 and stops.

In this case, since the flange 7a is in close contact with the inner wall surface of the open end 3a, there is no loss of magnetic force.According to the open type electromagnet of this invention, the permanent magnet 4 is placed at the bottom of the frame 3. Since it is fixed, a magnetic circuit with magnetic force loss as in the conventional case as shown by the broken line arrow in FIG. 2 is not formed.

Therefore, the gap B shown in FIG. 2 becomes unnecessary, and the other end of the movable element 7 can be slidably inserted into the open end 3a of the frame, and the collar 7a can be inserted inside the open end 3a. Can be placed close to the wall.

Therefore, there are almost no gaps in the path of the lines of magnetic force, and there is no loss of magnetic force.

In particular, since a collar is provided at the other end of the movable element, and the collar is brought into close contact with the inner wall surface of the open end when the movable element is released, the loss of magnetic force is small.

Furthermore, the sliding movement of the mover can be guided by the inner wall of the electromagnetic coil and the open end of the frame, and no guiding parts are required.

Furthermore, with only one permanent magnet, its magnetic force can be utilized to the fullest.

In addition, the spring can be installed between the electromagnetic coil and the collar, and no special spring support is required, so the device can be made smaller and lighter, and the structure is simpler and easier to assemble. has.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a conventional release type electromagnetic device. FIGS. 2 and 3 are explanatory diagrams of the operation of a conventional release type electromagnetic device. FIG. 4 is a side cross-sectional view showing one embodiment of the open-circuit electromagnetic device according to this invention. 5 and 6 are explanatory diagrams of the operation of the release type electromagnetic device according to this invention. In the figures, corresponding parts in each figure are given corresponding symbols, 2 is an electromagnetic coil, 3 is a frame, 3a is an open end, 4 is a permanent magnet, 7 is a mover, and 7a is a collar. , 8
It is a spring.

Claims (1)

[Scope of utility model registration request] a frame having an open end on a surface facing the bottom and forming a magnetic path; a hollow formed within the frame on the bottom side and surrounded by an inner wall from the bottom side toward the open end; an electromagnetic coil having an electromagnetic coil, a permanent magnet installed in the hollow part and attached to the bottom of the frame, one end of which is slidably inserted into the hollow part so as to be attracted to the permanent magnet, and the other end of which is attached to the bottom of the frame; an empty movable element that is slidably inserted into the open end and has a collar portion having an outer diameter larger than the diameter of the open end portion in an intermediate portion, and is installed between the electromagnetic coil and the collar portion; and a spring that resists the attractive force of the permanent magnet to move the mover away from the permanent magnet and joins the collar to the inner wall surface of the open end of the frame when the electromagnetic coil is excited, An open type electromagnetic device, wherein sliding movement of the movable element is guided by an inner wall forming a hollow part and the open end.