JP2872075B2 - Self-holding solenoid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a device for holding a stable state and for electromagnetically displacing a displacement from the stable state, for example, a self-holding solenoid device used for smoothly driving an electromagnetic valve. .

[0002]

2. Description of the Related Art Conventionally, when a movable iron core is urged in a suction direction, a suction state can be maintained even when the urging force is released.
Conversely, when the movable core is returned to its original position, a so-called self-holding type solenoid device which has been proposed to apply a biasing force in the opposite direction to the above-mentioned direction to return the movable iron core to the original position has been proposed in various structures today. For example, it is widely used as a drive source for an electromagnetic valve or the like.

As the self-holding type solenoid device, for example, one disclosed in Japanese Patent Publication No. 2-36043 is well known. The schematic structure will be described with reference to FIG. In FIG. 4, a fixed iron core 1 made of a magnetic material has a movable iron core 3 made of the same magnetic material as a magnetic pole Φx by the action of a magnetic flux Φx of a permanent magnet 2 having a magnetic pole surface S fixed to the fixed iron core 1 side. It is in a mechanically stable state by being sucked by the surfaces 4 and 5. Then, of the two electromagnetic coils 6a and 6b wound around the fixed iron core 1, one of the electromagnetic coils 6a is energized, and the magnetic flux Φy repelling the permanent magnet 2 is transferred to the movable iron core 3 → the permanent magnet 2 → The movable core 3 is induced in a magnetic path composed of the fixed core 1, and the magnetic pole surfaces 4 and 5 of the movable core 3 and the fixed core 1 are repelled from each other.
The other magnetic pole surface 7 is moved in a direction in which the other magnetic pole surface 8 of the fixed iron core 1 corresponding to the movable iron core 3 can be attracted.
After the movable core 3 moves, the attracted state is maintained by the action of the magnetic flux Φx of the permanent magnet 2 even if the energization of the electromagnetic coil 6a is cut off. Subsequently, when the movable core 3 is returned from the mechanically stable state to the direction in which the movable core 3 is attracted to the magnetic pole surfaces 4 and 5, the electromagnetic coil 6b is energized to operate the movable core 3 in the same manner as described above. It is configured to be easily returned to the original position, that is, in a mechanically bistable state.

[0004]

However, in the self-holding type solenoid device having the above-described structure, in manufacturing the solenoid device, the electromagnetic coils 6a and 6b are wound by using individual coil bobbins 6a ₁ and 6b ₁ respectively. And the permanent magnet 2 is connected to the electromagnetic coil 6.
Since the electromagnetic devices 6a and 6b and the permanent magnet 2 are assembled inside the fixed iron core 1 in a state where the solenoid devices are inserted between the solenoid devices a and 6b, the assembly of the solenoid device is very troublesome and time-consuming. Has been a major factor impeding its productivity.

In order to magnetize the permanent magnet 2, a magnetic member is inserted between the electromagnetic coils 6a and 6b in advance and the electromagnetic coils 6a and 6b
Since it is practically difficult to apply a large current to the coil and burn out the electromagnetic coils 6a and 6b, a magnetized magnet is used in advance. However, as described above, the electromagnetic coils 6a,
6b, the permanent magnet 2 is inserted between the electromagnetic coils 6a, 6b
When the permanent magnet 2 and the fixed core 1 are incorporated in the fixed core 1
Since the fixed core 1 itself serves as a permanent magnet because the fixed core is in contact with the fixed core, the adsorption is released each time the fixed core is attracted to another fixed core in assembling the solenoid device. Since the solenoid device must be assembled, it is very troublesome and troublesome, and after the permanent magnet 2 is assembled, the electromagnetic coils 6a, 6b
When performing quality control of a product by inspecting the inner diameter and the like of the above, there is a case where the measuring jig or the like is magnetized by the leakage magnetic flux of the permanent magnet 2 and its use is difficult.

Further, if the solenoid device has been used for many months, the movable core 3 repeatedly contacts the suction portion of the fixed core 1 several hundred thousand times, so that abrasion powder is generated at the time of suction. To adhere to the surface of the permanent magnet 2. In this case, if the abrasion powder adsorbed on the permanent magnet 2 is not removed, the attractive force of the permanent magnet 2 is reduced, and the holding function of the movable core 3 after the energization is released may be reduced.
It was necessary to periodically disassemble and clean the solenoid device. However, since the inside of the solenoid device is so narrow that even if the movable iron core 3 is removed, even the little finger of a human cannot enter, it is extremely difficult to remove the wear powder attached to the permanent magnet 2 smoothly. there were.

In addition, as described above, the electromagnetic coils 6a, 6b may be wound using one coil bobbin without separately providing the coil bobbins 6a ₁ , 6b ₁ for winding the electromagnetic coils 6a, 6b. Although it is conceivable, in this case, the coil bobbin itself may be a single coil bobbin without being divided into two, but the permanent magnet 2 cannot be interposed between the electromagnetic coils 6a and 6b if it is in a disk shape,
For example, it is cut in a semicircular shape and placed between the electromagnetic coils 6a and 6b.
Since the insertion is required, the production of the solenoid device is troublesome, and there is a problem that the production cost is increased.

In view of the various problems described above, the present invention provides a permanent magnet on a movable iron core side of a solenoid device for attracting and holding a movable iron core at a predetermined position after de-energization of an electromagnetic coil. Provided is a self-holding solenoid device that excels in suction holding power and energy saving effect, in which an iron core is magnetized immediately before being assembled into the solenoid device, thereby reliably eliminating the adverse effects that occur when assembling the solenoid device due to the presence of a permanent magnet. It is in.

[0009]

According to the present invention, there is provided a magnetic yoke formed by framing a pair of yoke pieces having a substantially U-shaped vertical section into a rectangular frame, and a coil bobbin housed in the magnetic yoke. An electromagnetic coil in which two coils of suction and repulsion are integrally wound around a core between the upper and lower flanges, and the electromagnetic coil is inserted into the core hollow above the coil bobbin and fixed at the upper end surface of the magnetic yoke. A fixed core, a movable core having a permanent magnet built-in below the fixed core and being loosely fitted in a hollow portion of the coil bobbin so as to be vertically movable, and formed integrally with a lower portion of the coil bobbin below the movable core; A cylindrical guide that is projected downward from a through hole in the lower surface of the magnetic yoke; and an iron core made of a magnetic material fitted and fixed to the lower opening end of the guide by press-fitting or fixing means such as an adhesive. Holding seat and Consists auxiliary yoke interposed between the lower flange portion and the lower end surface of the magnetic yoke of the coil bobbin, said magnetic yoke and an electromagnetic coil and molded by synthetic resin having excellent insulation properties constituting the solenoid body.

The solenoid body is, for example,
The solenoid body is provided with a compressed air inflow path and a delivery path in the same direction, and an exhaust path provided on the opposite side, for example, using a screw (not shown) on a valve body provided in two parts in an airtight manner. An upright and vertically movable valve body which is fixed upright in a valve chamber formed in the valve body is brought into contact with the movable iron core via a valve rod so as to be interlocked therewith, thereby driving the valve body. A self-holding solenoid device is provided.

[0011]

According to the present invention, when the permanent magnet incorporated in the movable core attracts and holds the movable core to the core holding seat and closes the valve port of the valve chamber by the valve body, the lower end edge of the movable core is closed. ,
When the movable yoke is moved upward and the fixed core is sucked and held by the upward movement of the movable core, and the valve body is moved upward to open the valve port, the permanent magnet is used. The lower magnet and the upper end surface of the auxiliary yoke are aligned with each other, and the permanent magnet is mounted on the movable core.When the movable core is moved upward by energizing the electromagnetic coil, the solenoid is energized by the energization. The magnetic flux induced in the magnetic path of the main body is caused by the lower end surface of the permanent magnet being located at an intermediate position of the thickness of the auxiliary yoke, that is, since a part of the permanent magnet is wrapped with the auxiliary yoke. Since the effective cross-sectional area of the auxiliary yoke cannot be satisfactorily used and its flow is suppressed, the movable core can be raised softly and suctioned to the fixed core without suddenly driving the movable core. , Movable Mind it is possible to effectively suppress the impact sound or the like generated by impulsively attracted to the fixed iron core.

When energization of the electromagnetic coil is stopped after the movable core is attracted to the fixed core, the permanent magnet is set so that the lower end surface thereof coincides with the upper end surface of the auxiliary yoke. Since a gap can be formed between the armature and the seat, most of the magnetic flux of the permanent magnet flows in the direction of attracting the movable core to the fixed core through the auxiliary yoke. Even if the energization of the coil is cut off, the permanent magnet can be effectively used to attract and hold the fixed iron core with a large holding force by effectively using the magnetic flux of the permanent magnet. The suction of the movable core and the fixed core is never released.

When the electromagnetic coil is energized in the opposite direction to attract the movable iron core to the iron core holding seat, the lower end edge of the permanent magnet is set to coincide with the upper end surface of the auxiliary yoke. Therefore, the magnetic flux induced by energization and flowing through the magnetic path in the solenoid body flows by effectively utilizing the cross-sectional area of the auxiliary yoke because the permanent magnet is present at a position not overlapping with the auxiliary yoke. As a result, the movable iron core is released from the fixed iron core by a large repulsive force, and descends to be sucked by the iron core holding seat. Then, after suction of the movable iron core, when the energization of the electromagnetic coil is cut off,
Since the movable magnetic core is attracted to the iron core holding seat, the leakage magnetic flux of the permanent magnet flows well in the direction of attracting and holding the movable iron core, and the movable core can be attracted to the iron core holding seat with a predetermined suction holding force. Therefore, even when a large impact is applied to the solenoid body, the movable iron core can be favorably sucked and held without detaching from the iron core holding seat.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 10 denotes a solenoid main body, and reference numeral 11 denotes a magnetic yoke of the solenoid main body 10.
As shown in FIG. 1, the magnetic yoke 11 is formed by, for example, a pair of yoke pieces 12 whose longitudinal sections are bent in a substantially U-shape. The coil 13 is housed. As shown in FIGS. 1 and 3, the electromagnetic coil 13 is provided on a coil bobbin 14 having a pair of flanges formed at predetermined intervals in the length direction of a hollow cylindrical core a housed in the magnetic yoke 11. The suction coil 13a is provided on the core side (inside).
a repulsion coil 13b is formed by winding a coil conductor a predetermined number of times outside the electromagnetic coil 13a.
When the electromagnetic coil 13 is provided by winding the attraction and repulsion coils 13 a and 13 b around the coil bobbin 14, the pair of yoke pieces 12 from the outside of the electromagnetic coil 13 are connected to each other as shown in FIG. The magnetic yoke 11 is housed inside by fixing the upper flange portion of the coil bobbin 14 and the pair of yoke pieces 12 to each other by, for example, screws or the like by pressing in a box shape. Assemble in the state.

Reference numeral 15 denotes an upper part of the coil bobbin 14,
The fixed core 15 is a cylindrical fixed core inserted into the hollow portion of the core a. As shown in FIG. 1, the fixed core 15 passes through a through hole 16 opened in the upper end surface of the magnetic yoke 11. It is screwed to the portion and fixedly held on the upper side in the magnetic yoke 11. Reference numeral 18 denotes a movable iron core which is loosely fitted to the lower part of the fixed iron core 15 so as to be movable up and down in a hollow portion of the core a of the coil bobbin 14. For example, a permanent magnet 19 formed in a disc shape with a predetermined thickness using a neodymium-based magnetic material is easily inserted and is hardly demagnetized. Reference numeral 20 denotes a guide which hangs downward from the through hole 21 formed at the lower end surface of the magnetic yoke 11 in correspondence with the through hole 16 by a predetermined length, and the guide 20 is a lower flange portion of the coil bobbin 13 as shown in FIG. Movable iron core 1 formed integrally with
8 is accommodated in the magnetic yoke 11, and extends downward from the through hole 21 of the magnetic yoke 11. An iron core holding seat 22 for sucking and holding the movable iron core 18 is provided at the lower open end of the magnetic yoke 11. The opening is closed and fixed by fixing means such as press-fitting or bonding with an adhesive.

Reference numeral 23 denotes an auxiliary yoke interposed between the lower flange portion of the coil bobbin 14 and the inside of the lower end surface of the magnetic yoke 11. The relationship between the mounting positions of the auxiliary yoke 23 and the permanent magnet 19 inserted and held in the movable iron core 18 will be described below. First, as shown in FIG. 1, when the permanent magnet 19 is inserted into the movable core 18, the lower edge of the permanent magnet 19 is moved from the upper end surface of the auxiliary yoke 23 to the movable and fixed core 1.
It is inserted in a state where it is lowered downward by a dimension corresponding to the gap g of 8, 15. When the permanent magnet 19 is inserted, the lower part of the movable core 18 is cut in a direction orthogonal to the length direction in consideration of the thickness of the permanent magnet 19, and each of the cut pair of the movable cores 18 is cut. A notch groove 24 is provided around a point which has moved a predetermined length in the axial direction from the surface.

After the notch groove 24 is formed, as shown in FIG. 1, a disk-shaped permanent magnet 19 is interposed between a pair of cut surfaces of the movable iron core 18, and in this state, the permanent magnet 19 is removed from the outside. A cover 25 made of a nonmagnetic pipe made of brass or the like to be covered is press-fitted from above the movable iron core 18,
Are aligned with the positions of the notch grooves 24 of the movable core 18, the two ends of the cover cylinder 25 are respectively rotated by rotating the movable core 18 using a special press device.
The cover cylinder 25 is fitted to the movable core 18 by press-fitting (rolling caulking) into the inside of the permanent magnet 1.
9 is held between the movable iron cores 18. As a result, as shown in FIG.
3 between the fixed core 15 and the movable core 18
Can be attached to the movable iron core 18 with an interval of the same size as the gap g between them. The permanent magnet 19 is formed by mounting a magnetic material on the movable iron core 18 and magnetizing the magnetic material by a magnetizing device (not shown) to form the permanent magnet 19.

In FIG. 1, reference numeral 26 denotes a coil spring interposed between the upper end inside the guide 20 of the coil bobbin 14 and the flange at the lower end of the movable core 18. The movable spring 18 always moves in the direction of the core holding seat 22. Energize. Reference numeral 27 denotes a resin insulating layer in which the electromagnetic coil 13 and the magnetic yoke 11 are resin-molded with a synthetic resin, and the outside of the magnetic yoke 11 is shielded from the outside and embedded.

Next, reference numeral 30 shown in FIG. 1 denotes a valve body formed by, for example, a two-part system, and the solenoid body 10
The guide guide 20 is inserted into the mounting hole 31 recessed at the top of the valve body 30 and the iron core holding seat 22 is locked on the locking step 32 near the bottom surface of the guide guide 20, so that the guide core 20 is mounted on the valve body 30 vertically In this state, the valve body 30 divided into two parts is fixed, and then fixed to the valve body 30 using a fastening screw (not shown) or the like, whereby the valve body 30 is held upright on the valve body 30. Reference numeral 33 denotes a valve chamber formed in the valve main body 30 through a small-diameter flow hole 34 with respect to the mounting hole 31.
A conical valve support 37 having an air inflow passage 35 communicating with a compressed air generating means (not shown) therein and having a valve port 36 opened at an upper end is integrally formed at the center of the bottom surface of 3. .

Above the valve port 36 of the valve support 37, a valve element 38 for opening and closing the valve port 36 is movable through a flow hole 34 and a through hole 39 provided in the iron core holding seat 22, respectively. It is attached to a valve stem 40 that contacts the lower end of the iron core 18 and is accommodated in the valve chamber 33 so as to be vertically movable. 4
Reference numeral 1 denotes a compression spring which is inserted into the valve support 37 and constantly urges the valve body 38 upward. The compression spring 1 is formed with a spring load slightly weaker than the spring load of the coil spring 26 pressing the movable iron core 18 downward. Reference numeral 42 denotes a compressed air delivery path provided in communication with the valve chamber 33, and reference numeral 43 denotes an air exhaust path formed in communication with the mounting hole 31. In FIG. 3, reference numeral 44 denotes an operation switch for sucking / opening the solenoid main body 10, and reference numeral 45 denotes a drive power supply for the solenoid main body 10.

Next, the operation will be described. In FIG. 1, the case where the electromagnetic coil 13 is not energized, that is,
When the operation switch 44 shown in FIG. 3 is in the “OFF” position, the magnetic flux Φi indicated by a two-dot chain line in FIG. 1 generated by the energization of the attraction coil 13 a of the electromagnetic coil 13 does not flow to the solenoid body 10. As a result, since the movable iron core 18 is in contact with the iron core holding seat 22, only the leakage magnetic flux Φr of the permanent magnet 19, as shown by the one-dot chain line in FIG. The yoke 11 → flows well through the magnetic path formed by the auxiliary yoke 23, and the movable core 1
8 is firmly sucked and held by the iron core holding seat 22 together with the urging force of the coil spring 26. For this reason, the valve stem 40 of the valve body 38
The valve body 3 descends downward and pushes the valve body 38 against the spring load of the compression spring 41 to communicate with the compressed air inflow passage 35.
The zero valve port 36 is closed. With the closing of the valve port 36, the compressed air delivery path 42 and the exhaust path 43 communicate with each other through the valve chamber 33 → the flow hole 34 → the mounting hole 31, and are connected to the terminal of the delivery path 42 so that the compressed air flows in. The air in the air cylinder or a flow path switching valve not shown is discharged from the discharge path 43,
The switching operation of the flow path switching valve and the like is performed.

A case will be described in which the movable iron core 18 is raised in the above state to supply compressed air from the air inflow passage 35 to the delivery passage 42. In this case, first, the operation switch 44 shown in FIG. 3 is switched and connected to the “ON” terminal side to energize the attraction coil 13 a of the electromagnetic coil 13. When the suction coil 13a is energized, the current i ₁
a flows in a clockwise direction, and as shown in FIG.
8 → an auxiliary yoke 23 → a magnetic yoke 11 → a magnetic path is formed by the fixed core 15. In this magnetic path, the magnetic flux 18 is attracted and held by the leakage flux Φr of the permanent magnet 19 which attracts and holds the movable core 18 to the iron core holding seat 22. Overcoming, the magnetic flux Φi induced by the energization of the attraction coil 13a flows as shown by a two-dot chain line in FIG. 1, and the movable iron core 18 is separated from the iron core holding seat 22 to be attracted to the fixed iron core 15.

In the attracting coil 13a, the magnetic flux Φi generated by the energization overcomes the attracting force due to the leakage magnetic flux Φr of the permanent magnetic flux and the urging force of the coil spring 26 for urging the movable core 18 downward, and the movable core 18 rises. The movable iron core 18 is wound so as to be movable.
Although the permanent magnet 19 and the auxiliary yoke 23 are wrapped with a predetermined wrap width h as shown in FIG. The movable core 18 can be sucked and held by the fixed core 15 so that the impact noise and vibration caused by the suction of the movable core 18 to the fixed core 15 can be reduced satisfactorily.

When the movable iron core 18 is attracted to the fixed iron core 15, the operation switch 44 is returned to the "OFF" position to cut off the energization of the attraction coil 13a. As a result, the magnetic flux Φm of the permanent magnetic flux 19 is applied to the solenoid body 10 as shown in FIG.
Flows through the same magnetic path as when the energizing of the attraction coil 13a is performed, and the movable core 18 overcomes the urging force of the coil spring 26 and is attracted and held by the fixed iron core 15.

In this case, the permanent magnet 19 and the auxiliary yoke 23
As shown in FIG. 2, the lower end edge of the permanent magnet 19 provided on the movable core 18 with the upward movement of the movable core 18 and the auxiliary yoke 23
Of the permanent magnet 19 and the auxiliary yoke 23 are eliminated, and a gap is formed between the movable core 18 and the core tightening seat 22.
The magnetic flux Φm of the permanent magnet 19 smoothly and satisfactorily flows from the movable core 18 to the auxiliary yoke 23 → the magnetic yoke 11, and holds the movable core 18 to the fixed core 15 with a large attractive force even when the energization to the attractive coil 13a is cut off. Let it. Therefore,
The movable core 18 can satisfactorily suction-hold the movable core 18 even when a large impact force is applied to the solenoid body 10 or during a power failure.

The upward movement of the movable core 18 causes the valve stem 40
The valve body 38 is shown in FIG. 2 because the upper end of the valve body 38 enters the space inside the mounting hole 31 of the valve body 30 (the guide 20 of the coil bobbin 14) by the urging force of the compression spring 41 via the valve body 38. As described above, the valve port 36 is opened and the communication hole 34 is closed. As a result, the compressed air inflow path 35 and the delivery path 42
Are communicated in the valve chamber 33, and the compressed air
2 and the exhaust passage 4 is closed by closing the flow hole 34.
The communication between 3 and the delivery path 42 is cut off. For this reason, the compressed air is smoothly supplied to the delivery path 42, and a switching operation of a flow path switching valve (not shown) connected to the terminal is performed.

Subsequently, when the movable core 18 is lowered in FIG. 2 to be sucked by the iron core holding seat 22, the operation switch 44 is switched from the "OFF" position shown in FIG. It performed energized repulsion coil 13b of the electromagnetic coil 13, as shown in Figure 3 to the repulsion coil 13b, electric current i ₂ in the reverse direction (counterclockwise direction) at the time of energization of the attracting coil 13a. For this reason, a magnetic path is formed in the solenoid body 10 by the movable iron core 18 → fixed iron core 15 → magnetic yoke 11 → auxiliary yoke 23, and a magnetic flux flowing in a direction opposite to the magnetic flux Φm of the permanent magnet 19 shown in FIG. Φi (indicated by a two-dot chain line) flows and separates the movable core 18 from the fixed core 15. Then, the movable iron core 18 is sucked and held by the iron core holding seat 22 as shown in FIG. 1 while lowering the movable iron core 18 to the iron core holding seat 22 side with the help of the urging force of the coil spring 26 as well.

For this reason, the movable iron core 18 is
The head of the valve stem 40 projecting into the space of the guide 20 from the through hole 39 is pushed down. As a result, the valve body 38 descends and the valve port 36 opening to the valve support 37 is opened.
Is closed, and the supply of compressed air from the inflow passage 35 to the delivery passage 42 is stopped. As described above, after the movable iron core 18 is lowered by energizing the repulsion coil 13b and sucked and held by the iron core holding seat 22, the operation switch 44 is returned to the “OFF” position to cut off the energization to the repulsion coil 13b. And movable iron core 1
8, as described above, the magnetic flux Φr of the permanent magnet 19 flows through the movable iron core 18 → the iron core holding seat 22 → the magnetic yoke 11 → the auxiliary yoke 23, whereby the iron core holding plate 22 is favorably maintained in the attracted state. By closing the valve port 36 by the valve body 38, the compressed air inflow path 35 can be smoothly closed.

As described above, according to the present invention, when the magnetic core 13 is not energized and the movable core 18 is lowered to be attracted to the iron core holding seat 22, the movable core 18 is permanently inserted into the interior thereof. The leakage magnetic flux Φr of the magnet 19 smoothly flows from the movable core 18 to the core holding seat 22 that is in contact with the movable core 18, and the movable core 18 can be favorably attracted and held.

Conversely, when the movable iron core 18 is moved upward and attracted to the fixed iron core 15, the magnetic flux Φm
Is formed between the movable core 18 and the magnetic yoke 11 by forming a gap between the movable core 18 and the core holding seat 22.
As shown by a two-dot chain line in FIG. 1, the magnetic flux flows as well as the magnetic flux Φi, and the movable iron core 18 is firmly attracted and held by the fixed iron core 15. As a result, when the movable core 18 descends, it moves to the core holding seat 22, and when it moves upward, the fixed core 1 moves.
5, the electromagnetic coils 13
Even if power supply to the power supply is cut off, the suction holding state can be maintained well, and even if an external impact or power failure occurs, the suction state can be maintained well, so that the valve port 36 of the valve main body 30 opens and closes unexpectedly and is not shown. An accident such as a malfunction of the flow path switching valve or the cylinder can be avoided.

As described above, when the movable iron core 18 is not energized to the electromagnetic coil 13, the leakage magnetic flux Φ of the permanent magnet 19
r and the magnetic flux Φm, the movable core 1 is favorably sucked and held by the core holding seat 22 or the fixed core 15.
The mounting position of the permanent magnet 19 inserted in the
Is set so that the leakage magnetic flux Φr or the like flows satisfactorily with respect to the position of the movable core 1, in addition to the biasing force of the coil spring 26 which biases the movable core 18 downward when the movable core 18 descends.
The core holding seat 22 for sucking and holding the solenoid 8 is connected to the solenoid body 1.
0 to constitute the solenoid body 10. Therefore, the movable iron core 18 is
3, even when the power is not supplied, the attraction force of the permanent magnet 19 can be utilized to the maximum and the closed state of the valve port 36 can be reliably maintained. Therefore, a self-holding solenoid device excellent in energy saving effect is provided. can do.

In addition, the permanent magnet 19 can be easily magnetized in a state where it is mounted on the movable iron core 18 and hardly demagnetized.
For example, since a neodymium-based magnetic material is interposed and held, and this magnetic material is magnetized by a magnetizing device before the movable iron core 18 is incorporated into the solenoid body 10, a permanent magnet 19 is obtained. When the magnet 19 is generated, its attachment and detachment, coupled with the fact that the columnar movable core 18 can be easily inserted into the magnetizing device, can easily perform the magnetizing work, and wear powder is attached to the movable core 18 by the suction operation of the movable core 18. Even if it adheres, the solenoid core 10 can be easily removed from the movable iron core 18 by releasing the fixation to the valve body 30, and even if abrasion powder adheres to the movable iron core 18, it can be easily cleaned. So, the solenoid body 10
Can be used smoothly and favorably over a long period of time.

[0033]

As described above, according to the present invention, the permanent magnet incorporated in the movable iron core is adjusted so that the lower edge of the permanent magnet coincides with the upper end surface of the auxiliary yoke when the movable iron core is raised, and when the movable iron core is lowered. The lower edge of the permanent magnet is attached to the movable core with the gap between the movable core and the fixed core wrapped around the auxiliary yoke.
When the fixed iron core or the core holding seat is attracted and held, the magnetic flux of the permanent magnet flows between the movable core and the magnetic yoke so that a large attractive force is obtained, so that the movable iron core is fixed with a large attractive force. The iron core or the iron core holding seat can be sucked and held. As a result, the movable iron core can be sucked and held well even when the electromagnetic coil is not energized.

When the movable core is attracted to the fixed core, a gap is formed between the movable core and the core holding seat. Conversely, when the movable core is sucked to the core holding seat, the movable core is located between the fixed core and the fixed core. Since the solenoid device is configured so that a gap is generated in the solenoid device of the present invention, when the electromagnetic coil is not energized, the movable iron core can be attracted and held by efficiently using the magnetic flux from the permanent magnet. A self-holding solenoid device excellent in energy saving effect can be provided.

Further, according to the present invention, when the permanent magnet is mounted, the mounting position relationship with the auxiliary yoke may be set based on the gap between the movable core and the fixed iron core, so that the setting of the mounting position is easy. At the same time, by attaching the permanent magnet to the movable iron core, the magnetizing work for manufacturing the permanent magnet can be easily performed, and even if wear powder adheres to the movable iron core, the cleaning is done by disassembling the solenoid device. There is also an advantage that the self-holding type solenoid device can be economically manufactured with a simple configuration, for example, by easily taking out the movable iron core.

[Brief description of the drawings]

FIG. 1 shows a self-holding solenoid device of the present invention.
It is a longitudinal cross-sectional view which shows the state which made the movable iron core attracted to the iron core holding seat.

FIG. 2 shows a self-holding solenoid device of the present invention.
It is a longitudinal cross-sectional view which shows the state which made the movable iron core attracted to the fixed iron core.

FIG. 3 is a schematic electric circuit diagram of the self-holding solenoid device of the present invention.

FIG. 4 is an explanatory view schematically showing a configuration of a conventional self-holding type solenoid device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 solenoid body 11 magnetic yoke 13 electromagnetic coil 14 coil bobbin 15 fixed iron core 18 movable iron core 19 permanent magnet 22 iron core tightening seat 23 auxiliary yoke 30 valve body 36 valve port 38 valve body a core

Claims (2)

(57) [Claims] An electromagnetic coil is provided by winding a coil conductor around a hollow cylindrical core of a coil bobbin a predetermined number of times, and the coil bobbin provided with the electromagnetic coil is placed in a magnetic yoke with an auxiliary yoke interposed at a lower edge thereof. The movable core containing a permanent magnet is accommodated in the hollow core of the coil bobbin so as to be movable up and down, and the movable core rises in the upper part of the hollow core. A self-holding solenoid device comprising: a fixed iron core for sucking and holding the core; and a core holding seat for sucking and holding the movable iron core when the movable core is lowered is attached to a lower portion of a hollow cylindrical core. 2. The permanent magnet built in the movable core has its lower edge aligned with the upper end surface of the auxiliary yoke when the movable core is raised, and the gap between the movable core and the fixed core when the movable core is lowered. 2. The self-holding solenoid device according to claim 1, wherein the self-holding solenoid device is mounted on the movable iron core while being wrapped with the auxiliary yoke in dimensions.