JPH0447925Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention]

(Field of Industrial Application) This invention relates to a pulse current electromagnet (latching type solenoid) used for opening and closing automobile door locks and various bubbles, for example. (Prior Art) Conventionally, as the above-mentioned latch type solenoid, there has been one shown in FIG. That is, the illustrated latching solenoid 100
is a cylindrical or U-shaped side wall 101a.
A bottom wall 101b is provided at the end of the bottom wall 101b.
A frame 101 is provided, and an electromagnetic coil 102 is housed in this frame 101, and a magnet 103 is magnetized with an N pole or an S pole on the inner circumference side and an S pole or N pole on the outer circumference side. is provided above the electromagnetic coil 102 in the drawing, and a cap 104 made of a non-magnetic material is fixed to the top of the magnet 103 in the drawing. A shaft-shaped plunger 105 is slidably inserted through the electromagnetic coil 102, magnet 103, and cap 104, and a spring stopper 105a is provided near the upper end of the plunger 105 in the figure.
A return spring 106 is provided between the cap 104 and the plunger 105 to urge the plunger 105 upward in the figure. By switching switches 107, 107 connected to the electromagnetic coil 102 to one direction in the figure, power is switched and supplied to the electromagnetic coil 102, and the plunger 105 is connected to a load. It is set as. Here, when the illustrated plunger 105 is in the returned state, the plunger 105 is urged upward in the figure by the return spring 106. Therefore, in this state, the switch 107,
When 107 is switched upward in the figure, power is supplied to the electromagnetic coil 102 and it is excited. As a result, when illustrated, the electromagnetic coil 1
02, the N pole plunger 1 of the magnet 103
05 Protrusion 101c of frame 101 Bottom wall 101b of frame 101 Side wall 1 of frame 101
Magnetic flux φ ₁ passing through the S pole of 01a magnet 103
o is generated, the plunger 105 is sucked downward in the figure until it comes into contact with the protrusion 101c of the frame 101, and the load connected to the plunger 105 is actuated. Then, when the plunger 105 comes into contact with the protrusion 101c of the frame 101, the switch 10
7,107 returns to the neutral position, the electromagnetic coil 10
2 is demagnetized and no longer attracts the plunger 105 downward in the figure, but the N pole plunger 105 of the magnet 103 has the protrusion 101c of the frame 101
Since a magnetic flux φ ₂ o passing through the S pole of the side wall 101a magnet 103 of the 01b frame 101 is generated, the plunger 105 continues to be attracted downward in the drawing against the return spring 106. As a result, the plunger 105 is held at the lower operating end in the figure. Next, in this state, the switch 107,
When 107 is switched to the lower side in the figure, power is supplied to the electromagnetic coil 102 in the opposite direction to that in the case described above, and the electromagnetic coil 102 is excited. As a result, the side wall 101a of the S pole frame 101 of the magnet 103 is attached to the electromagnetic coil 102.
Bottom wall 101b of frame 101 frame 101
Since the magnetic flux φ ₃ o in the opposite direction to the magnetic flux φ 2 o is generated through the N pole of the projection 101c of the plunger 105 and the magnet ₁₀₃ , the magnetic flux φ ₂ o and the magnetic flux φ ₃ o cancel each other out. Then, the plunger 105 is operated to return to the upper side in the figure by the return spring 106. Furthermore, in this state, the switch 107,
107 to the neutral position, the electromagnetic coil 10
2 is demagnetized, and the plunger 105 is returned to the spring 1.
06, it returns to the state where it is energized upward in the figure. (Problem to be Solved by the Invention) However, in the conventional latch type solenoid 100 described above, the electromagnetic coil 102 generates a magnetic flux φ 1 o that attracts the plunger 105 by switching the power supply, and the magnet 103 also generates a magnetic flux φ ₁ o that attracts the plunger 105. Magnetic flux φ ₃ o that cancels the generated magnetic flux φ ₂ o
For example, when a high voltage is supplied to the electromagnetic coil 102, the electromagnetic coil 102 generates a magnetic flux φ ₃ o that is greater than the plunger holding force.
There is a problem in that it cannot be said that there is no possibility that the electromagnetic coil 102 will not cause the plunger 105 to be pulled in and malfunction, and therefore it is desirable to ensure that the electromagnetic coil 102 operates without causing the plunger 105 to be pulled in. There was a problem with this. (Purpose of the invention) This invention was made in view of the above-mentioned conventional problems.The purpose of this invention is to provide an electromagnetic switch whose electromagnetic coil operates reliably without causing the plunger to be retracted. This made me question the ingenuity of the company.

[Structure of the idea]

(Means for Solving the Problems) A latch type solenoid according to this invention includes a permanent magnet, a pair of electromagnetic coils provided on both sides of the permanent magnet, and a portion with high magnetic resistance between the pair of electromagnetic coils. In the latch type solenoid, the permanent magnet and the plunger extending over the electromagnetic coil are provided in a frame forming a magnetic path, and the permanent magnet side of each electromagnetic coil has a predetermined groove extending from the frame to the inner circumferential side. The present invention is characterized in that magnetic induction guides are provided at intervals and close to the plunger, and this structure of the latch type solenoid is used as a means to solve the above-mentioned conventional problems. be. (Function) In the latch type solenoid according to this invention, the magnetic induction inductor is provided on the permanent magnet side of each electromagnetic coil at a predetermined distance from the frame toward the inner periphery and close to the plunger. When a high voltage is supplied, the plunger operates reliably and quickly without causing the plunger to be pulled in by the electromagnetic coil. (Example) Hereinafter, an example of the latch type solenoid according to this invention will be described with reference to FIGS. 1 to 4. That is, in the illustrated latch type solenoid 1, reference numeral 2 indicates a frame main body 2a, a bottom 2b,
2c, numeral 3 is a permanent magnet, numerals 4 and 5 are electromagnetic coils, numeral 6 is a plunger with a notch 6a which is a large magnetic resistance part, and numerals 7 and 8 are each for magnetic induction. It is a derivative. Frame body 2a forming part of frame 2
is made of a cylindrical magnetic material, and has bottom mounting portions 2e and 2d at both upper and lower ends in the figure for mounting bottoms 2c and 2b, respectively. Bottoms 2b and 2c forming part of frame 2
Both of these bottoms 2b and 2c are made of a magnetic material, and one of the bottoms 2b is attached to a bottom mounting portion 2 provided at the lower end of the frame body 2a in the figure.
d, and is provided with a bottom protrusion 2f, which is a substantially conical protrusion protruding upward in the figure, at approximately the center. The other bottom 2c of the bottoms 2b and 2c has an outer shape to be attached to a bottom mounting portion 2e provided at the upper end of the frame body 2a in the figure, and has a substantially conical shape protruding downward in the figure at approximately the center. A bottom protrusion 2g is provided as a convex portion, and a through hole 2h penetrating the bottom 2c is provided at approximately the center of the bottom protrusion 2g in the upper and lower directions in the figure. The permanent magnet 3 has an N pole on its inner circumference and an S pole on its outer circumference.
It has a ring shape that is magnetized to the pole, and has a fixed part 3a fixed to the frame main body 2a on the outer peripheral side.
It also has an insertion hole 3b on the inner peripheral side, which has an inner diameter slightly larger than the outer diameter of the plunger 6, which will be described later, and into which the plunger 6 is inserted. The electromagnetic coils 4 and 5 both have openings 4a and 5.
Lead wires 4c, 4d and 5c, which supply excitation power to these electromagnetic coils 4, 5, are respectively wound around bobbins 4b, 5b having a
5d each. The lead wire 4c of the electromagnetic coil 4 is electrically connected to one fixed contact 9a of the switch 9, and the lead wire 5c of the electromagnetic coil 5 is electrically connected to the other fixed contact 9b of the switch 9. By switching the movable contact 9c of the switch 9, the lead wires 4c and 5c are respectively grounded. Further, the lead wire 4d of the electromagnetic coil 4 and the lead wire 5d of the electromagnetic coil 5 are electrically connected to a power source. on the other hand. The plunger 6 is provided with a notch 6a, which has an outer diameter smaller than the outer diameter of the shaft 6b and has a large magnetic resistance, approximately at the center of the substantially cylindrical shaft 6b. The shaft portion 6b is provided with bottom groove portions 6c and 6d near the upper and lower ends in the figure, which are similar and substantially conical recesses that are inserted into the bottom protrusions 2f and 2g provided on the bottoms 2b and 2c, respectively. There is. Further, an output shaft 6e made of a non-magnetic material is attached near the upper end of the shaft portion 6b in the figure, and a load (for example, an air bubble needle) is connected to this output shaft 6e. On the other hand, the magnetic induction inductors 7 and 8 are donut-shaped in this embodiment and are made of iron, and have sliding holes 7a and 8a on the inner periphery having inner diameters through which the plunger 6 can be slidably inserted. , and each has a predetermined clearance dimension (predetermined interval) Co from the outer periphery of these guides 7 and 8 to the inner periphery of the frame main body 2a. Here, as shown in FIG.
A fixed part 3a of the permanent magnet 3 is fixed at approximately the middle position of the permanent magnet 3.
Electromagnetic coils 4 and 5, each having an inductor 7 and 8 provided on the permanent magnet 3 side, are inserted into the upper and lower ends of the frame body 2a in the figure, that is, near the upper and lower ends of the frame body 2a in the figure, and are fixed to the frame body 2a. There is. Also, the opening 4a of one electromagnetic coil 4, the sliding hole 7a of one inductor 7, the insertion hole 6 of the permanent magnet 3,
b. After inserting the plunger 6 into the sliding hole 8a of the other inductor 8 and the opening 5a of the other electromagnetic coil 5, insert the plunger 6 into the bottom mounting part 2d at the lower end of the electromagnetic coil 5, that is, the lower end of the frame body 2a. One bottom 2b is fixed and the output shaft 6e attached to the plunger 6 is inserted into the through hole 2h provided in the other bottom 2c. The bottom 2c is fixed to the attachment part 2e. As shown in FIG. 2, closed magnetic circuits A and B including the permanent magnet 3 and the electromagnetic coils 4 and 5 on each side are formed, and a closed magnetic path consisting of the electromagnetic coils 4 and 5 and both magnetic bodies 3 and 6 is formed. form C. Next, the operation of the latch type solenoid 1 according to this invention will be explained. First, as shown in FIG. 2, in the return state where the plunger 6 is located at the upper side of the figure, magnetic flux φ ₁ and magnetic flux φ ₂ generated from the permanent magnet 3 are generated in each of the closed magnetic paths A and B. There is. That is, the magnetic flux φ ₁ is composed of the N pole of the permanent magnet 3, the plunger 6, the bottom 2c, the frame body 2a, and the S pole of the permanent magnet 3. Also, the magnetic flux φ ₂
is the N pole plunger 6 bottom 2b of the permanent magnet 3
Since the frame body 2a is composed of the S pole of the permanent magnet 3, there is an air gap between the plunger 6 and the bottom 2b, which increases the magnetic resistance in this part, and the magnetic flux φ ₁ >magnetic flux φ ₂
The plunger 6 is held in a state where it is attracted to the electromagnetic coil 4 side. Next, as shown in FIG. 3, when the switch 9 is switched to bring the movable contact 9c into contact with the fixed contact 9b and the electromagnetic coil 5 is excited, the magnetic flux φ ₃ and magnetic flux φ ₄ generated from the electromagnetic coil 5 are Each closed magnetic circuit B, C
occurs in That is, most of the magnetic flux generated from the electromagnetic coil 5 is induced by the magnetic induction inductor 8 provided in the electromagnetic coil 5, and
Plunger 6 bottom 2b frame body 2a
A large magnetic flux φ ₃ is made up of the electromagnetic coil 5, and the remaining part is an extremely small magnetic flux made up of the electromagnetic coil 5, the frame body 2a, the bottom 2c, the plunger 6 (including the cutout 6a with large magnetic resistance), the bottom 2b, and the electromagnetic coil 5. It becomes _φ4 . Then, the magnetic flux φ ₃ due to the magnetic induction inductor 8
acts to attract the plant gear 6 downward in the drawing together with the magnetic flux φ ₂ generated in the closed magnetic path B, and the magnetic flux φ ₄ and the magnetic flux φ ₁ generated in the closed magnetic path A cancel each other and become zero. As a result, the plunger 6 is attracted to the electromagnetic coil 5 side, and the output shaft 6e attached to the plunger 6 is operated to operate the load. Further, as shown in FIG. 4, the switch 9 is switched to connect the movable contact 9c to the fixed contact 9b.
When the electromagnetic coil 5 is demagnetized by separating it from the permanent magnet 3, the magnetic flux φ ₁ generated from the permanent magnet 3 is caused by the air gap between the plunger 6 and the bottom 2c.
The magnetic resistance of this part becomes large, and there is a relationship of magnetic flux φ ₁ <magnetic flux φ ₂ . Therefore, the plunger 6 is held in a state where it is attracted to the electromagnetic coil 5 side. In this state, when the switch 9 is turned to bring the movable contact 9c into contact with the fixed contact 9a, the electromagnetic coil 4 is energized and operates in the same manner as described above, and the plunger 6 is attracted to the electromagnetic coil 4 side. The plunger 6 is then returned to its original state, and the load connected to the output shaft 6e is returned to operate, and even after that, the plunger 6 is maintained in a state where it is attracted to the electromagnetic coil 4 side.

[Effect of the idea]

As explained above, the latch type solenoid according to this invention has a permanent magnet, a pair of electromagnetic coils provided on both sides of the permanent magnet, and a portion with high magnetic resistance between the pair of electromagnetic coils. In a latch type solenoid in which the permanent magnet and the plunger extending over the electromagnetic coil are provided in a frame forming a magnetic path, the permanent magnet side of each electromagnetic coil is provided with a predetermined interval from the frame to the inner circumferential side. Since the structure includes magnetic induction inductors that are spaced apart from each other and close to the plunger, the plunger can be operated reliably and quickly without causing the plunger to be pulled in by the electromagnetic coil when a high voltage is supplied. It has the excellent effect of being able to

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway external view of a latch type solenoid according to an embodiment of the invention, Figs. 2 to 4 are longitudinal sectional side views illustrating the operation of the latch type solenoid shown in Fig. 1, and Fig. 5. 1 is a longitudinal sectional side view of a conventional latch type solenoid. 1... Latch type solenoid, 2... Frame,
3... Permanent magnet, 4, 5... Electromagnetic coil, 6...
Plastic, 7, 8... Inductor, Co... Predetermined clearance dimension (predetermined interval).

Claims (1)

[Scope of utility model registration request] A permanent magnet, a pair of electromagnetic coils provided on both sides of the permanent magnet, and a plunger having a portion with high magnetic resistance between the pair of electromagnetic coils and spanning the permanent magnet and the electromagnetic coil,
In a latch type solenoid provided in a frame forming a magnetic path, on the permanent magnet side of each of the electromagnetic coils, a magnetic induction coil is provided on the permanent magnet side of the electromagnetic coil and is spaced apart from the frame at a predetermined distance on the inner circumferential side and close to the plunger. A latch type solenoid characterized in that it is provided with respective derivatives.