JPH08178110A - Solenoid - Google Patents

Abstract

PURPOSE: To facilitate control by avoiding complex electric control by providing a switching means to cut off an electric circuit communicated to a coil part of low resistance to move a plunger from a first position to a second position of first and second coil parts when a movable part comes to the second position at the time of electrifying the coil parts. CONSTITUTION: A pull coil 31 is a coil for actuation to generate supermagnetic force required to move a plunger 11 from a first position I to a second position II, low in resistance and devised to flow a large electric current. A hold coil 32 is a coil for holding to generate supermagnetic force required to hold it at the second position II, high in resistance and devised free to continuously electrify. Additionally, a switching means 7 to cut off an electric circuit communicated to the pull coil 31 at a stroke end at the time when the plunger 11 moves to the second position II is provided. When the plunger 11 forming a movable part K comes to the second position II, the switching means 7 is automatically switched off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid used as, for example, an electromagnetic actuator.

[0002]

2. Description of the Related Art A conventional solenoid of this type is shown in FIG. That is, the first coil portion 100 (low resistance) and the second coil portion 10 having different resistances are provided.
Coil part 102 having 1 (high resistance) and movable part 103
The movable part 103 is configured to move from the first position to the second position and maintain the second position by a magnetic attraction force generated when the coil part 102 is energized. In 104, a large current is passed through the first coil portion 100 having a low resistance in order to obtain a large attractive force when moving the movable portion 103 from the first position to the second position. However, since the amount of heat generated is large, continuous energization cannot be performed, and energization is performed only during the stroke in which the movable portion 103 moves from the first position to the second position, and thereafter the second coil portion 101 having high resistance and capable of continuous energization. The second position is retained.

Therefore, conventionally, in order to prevent heat generation in the first coil portion 100, a timer 201 or the like is used as in the control circuit 200 shown in FIG. Was there.

The lead wire for the solenoid 104 is connected to the start switch 202 of the electric circuit 200 for energizing and de-energizing the first and second coil portions 100, 101, and the timer 201. There are three lead wires 107 connected to.

[0005]

As described above, in the case of the above-mentioned conventional technique, the control circuit 200 requires a special control device such as the timer 201, and the control is complicated.

Also, with respect to the stroke response time when the coil portion 102 is energized, the first coil portion 10 is checked for safety.
It is necessary to set the energization time of 0 to be longer via the timer 201. Therefore, it becomes difficult to suppress the heat generation of the first coil unit 100, which easily deteriorates the control performance.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to avoid complicated electric control, to facilitate control, and to generate heat in the coil portion. It is to provide a solenoid that can be prevented to improve control performance.

[0008]

In order to achieve the above object, the present invention comprises a coil section having a first coil section and a second coil section having different resistances, and a movable section. The part moves from the first position to the second position by a magnetic attraction force generated when the coil part is energized, and the second position is the second coil part of the first and second coil parts with high resistance. In the solenoid configured to maintain, when the movable part is in the second position when the coil part is energized, the solenoid is switched from the first position to the second position in the first and second coil parts. It is characterized in that a switch means is provided for interrupting the electric circuit leading to the coil portion having a low resistance for moving.

Further, a coil portion having a first coil portion and a second coil portion having different internal hollow resistances, a movable member made of a magnetic material reciprocally inserted into the hollow portion of the coil portion, and the movable member. A fixed member made of a magnetic material and provided coaxially to face the member, and the movable member is magnetically attracted to the fixed member by energizing the coil portion,
In the solenoid configured to move from the position to the second position and maintain the second position in the coil portion having the higher resistance among the first and second coil portions, the fixed member is provided on the movable member side. A projecting axially reciprocally movable rod is provided, and a movable contact that moves along with the movement of the rod is provided on the far end side of the rod, and the first and the first contacts provided in contact with the movable contact toward the far end side of the rod. Switch means provided with a fixed contact connected to a coil portion having a low resistance for moving from the first position to the second position of the two coil portions, and pressing means for pressing the movable contact toward the fixed contact side. May be provided.

[0010]

In the solenoid having the above-mentioned structure, the weight of itself, the force of the spring for returning, or the force of fluid such as hydraulic pressure is usually exerted on the external driving object,
The first position is maintained when no current is applied to the coil portion. Further, when an electric current is applied to the coil portion having the first and second coil portions having different resistances, a thrust force larger than the force acting on the driven object is generated by the magnetomotive force of the coil portion, and the thrust is generated together with the movable portion. , The driven object is moved to the second position. Then, while the current is flowing through the coil portion, the movable portion and the driven object continue to maintain the second position.

Therefore, when moving from the first position to the second position, a large current is applied to, for example, the first coil portion having a low resistance in order to obtain a large attracting force, and thereafter, it is simply held at the second position. Therefore, the current is continuously applied to, for example, the second coil portion having a high resistance.

Therefore, if the time for energizing the first coil portion for moving the movable portion to the second position is too long, heat will be generated. However, according to the above configuration, the movable portion is moved to the second position. Since the switch means for cutting off the electric circuit leading to the first coil portion is provided when the temperature becomes low, heat generation of the first coil portion can be prevented and the control performance is not impaired.

Thus, when the second position is reached,
Since the switch means for automatically shutting off the energization of the first coil portion, which is likely to generate heat, is provided, the control is easy because it is not a complicated control system.

A movable member made of a magnetic material is used as the movable portion, and the second position of the movable member is a position magnetically attracted to the fixed member made of the magnetic material, and the fixed member protrudes toward the movable member. A movable contact that moves with the movement of the rod is provided on the back end side of the rod that is capable of reciprocating in the direction.
A fixed contact that is provided toward the rear end side of the rod that is in contact with the movable contact and that is connected to the first coil portion having a low resistance for moving to the second position; and the movable contact on the fixed contact side. With the switch means including the pressing means for pressing, the movable contact is connected to the fixed contact by the pressing means when the coil portion is not energized, so that the switch means is turned on and the coil portion can be energized.

When the coil member is energized, when the movable member is magnetically attracted by the fixed member to the second position, the rod protruding toward the movable member is pushed, and the rod is moved by this attraction force. As a result, the movable contact is separated from the fixed contact against the pressing force of the pressing means, and the energization to the first coil portion, which is apt to generate heat, is automatically cut off, and the switch means is turned off, so that heat generation is prevented. It

Further, according to this switch means, when the movable member is held at the second position, when the movable member is pulled away from the fixed member due to disturbance while being magnetically attracted to the so-called fixed member, it is pushed by the attractive force. The rod will protrude from the end surface of the fixed member toward the movable member, and the movable contact that was pushed by the rod so as to be separated from the fixed contact is
By the pressing force of the pressing means, the first contact is automatically connected to the fixed contact, and the first coil is energized, so that the second position can be restored.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1 showing a solenoid according to an embodiment of the present invention, S indicates the entire solenoid, which is a pull type and is for obtaining a long stroke and a high suction force in a smaller size. And a coil part having a first coil part and a second coil part different from each other. The switch means according to the present invention is provided so as to operate when the movable part is retracted to the second position.

In FIG. 1, reference numeral 1 is a case, and a plate 2 constituting a magnetic path is integrally attached to the front end portion thereof. Reference numeral 3 denotes an inner hollow coil portion, which is wound around the bobbin 4. Reference numeral 5 is a center post as a fixing member made of a magnetic material, which is fixed inside the hollow of the bobbin 4 and defines a second position II into which the movable portion is retracted. Reference numeral 6 is a ring-shaped upper plate that constitutes a magnetic path, and is fixed to the case 1 integrally with the center post 5. Reference numeral 7 is a switch means according to the present invention, and 8 is a cover, which is crimped and fixed to the rear opening end of the case 1. The cover 8, the center post 5, and the upper plate 6 are
An enclosed space is created, and the switch means 7 is provided in the space.

A guide 9 of a movable part is fixed to the plate 2 at the front end of the case 1, and a magnetic field is provided coaxially with the bush 10 which is press-fitted therein so as to face the center post 5. Plunger 1 as a movable member made of body
Guide the axial movement of 1. Plunger 11 has
The plunger rod 12 is integrally fixed, and the plunger 11 and the plunger rod 12 constitute a movable portion K of the solenoid. The plunger 11 is provided inside the hollow portion of the coil portion 3 via the guide 9 and the bush 10. It is reciprocally inserted.

When the solenoid S is incorporated in a device or the like, a driving object (not shown) is connected to the tip of the plunger rod 12. For this driven object,
When the coil portion 3 is not energized, it is generally biased by a spring or the like so as to pull back from the operating direction of the solenoid S (in this solenoid S, the pulling direction), whereby the first position I is determined. There is.

The coil section 3 has a first coil section and a second coil section having different resistances in order to obtain a long stroke and a high suction force as described above, and is constructed as follows. There is. That is, the bobbin 4 has two stages in front and rear, and is wound around the front bobbin 41 (plunger 11 side) as the first coil portion and the rear bobbin 42 (center post 5 side). The hold coil 32 serves as a second coil portion, and the pull coil 31 and the hold coil 32 are arranged side by side in the axial direction.

The pull coil 31 is a first coil of the plunger 11.
Is a coil for operation for generating a magnetomotive force necessary for moving from the position I to the second position II, and has a low resistance and allows a large current to flow. The hold coil 32 is a holding coil for generating a magnetomotive force required to hold the second position II, has a high resistance, and can be continuously energized.

Further, the center post 5 has a through hole 51 penetrating on the central axis, and the rod 13 is reciprocally inserted into the through hole 51. This rod 13 has a flange portion 1 at the end on the cover 8 side, which faces outward in the radial direction.
3A, the tip of the rod 13 projects toward the plunger 11 by a predetermined length when the flange 13A comes into contact with the end surface of the center post 5.

Then, on the flange portion 13A side of the rod 13, in the space described above, when the plunger 11 moves to the second position II, the pull coil 31 at the stroke end (when it comes into contact with the end face of the center post 5). A switch means 7 is provided for shutting off the electric circuit leading to.

The switch means 7 is connected to the pull coil 31 and has terminals A14, B15 and flange portion 13A as fixed contacts extending from both sides in the radial direction toward the flange portion 13A of the rod 13 on the same plane. The switch plate 16 as a movable contact that moves together with the rod 13 via the switch plate 16 provided between the switch plate 16 and the cover 8 is connected to the terminal A14,
It is provided with a spring 17 as a pressing means for pressing and making contact with the B15 side. Further, in order to restrict the radial movement of the spring 17 to some extent, the switch plate 16 has a convex portion 16A protruding toward the cover 8 side.
However, the cover 8 is provided with a recess 81.

In the switch means 7, normally, the switch plate 16 is pushed toward the terminals A14 and B15 by the spring force of the spring 17, and thus the terminal A1.
4, B15 and the switch plate 16 are in contact with each other, the terminals A14, B15 are connected, and the pull coil 31 can be energized.

Then, lead wires 18 and 19 for supplying electricity are connected to the coil portion 3.

The control circuit 20 for the solenoid S constructed as described above is as shown in FIG. That is, in the figure, reference numeral 21 is a start-up switch, lead wires 18 and 19 are connected, and 22 is a power supply.

Next, the operation of the solenoid valve 1 having the above structure will be described with reference to FIGS. 1 and 2.

When the starting switch 21 is off, the coil portion 3 is not energized, and is biased by the spring or the like which pulls back from the operating direction of the solenoid S (in this solenoid S, the pulling direction), as described above, and the first position. I (Fig. 1
(A)).

At this time, since the rod 13 reciprocally provided on the center post 5 remains as it is, the switch means 7 provided on the flange 13A side of the rod 13 is provided.
The switch plate 16 comes into contact with the terminals A14 and B15 by the spring force of the spring 17, and the switch means 7 is turned on (see FIG. 2).

Then, by turning on the start switch 21, the coil portion 3 is energized. That is, the pull coil 31 and the hold coil 32 are simultaneously energized. As a result, the center post 5 → upper plate 6 → case 1
A magnetic path composed of the plate 2, the plunger 11 and the center post 5 is formed, and the plunger 11 is magnetically attracted to the center post 5 by the magnetic attraction force and moved from the first position I to the second position II. It

At this time, since the rod 13 reciprocally provided on the center post 5 protrudes from the end face of the center post 5 toward the plunger 11, the plunger 11 is magnetically attracted to the center post 5 and is moved to the second position. When it becomes II (stroke end), the rod 13 is pushed by this suction force, and the switch plate 16 of the switch means 7 becomes the spring force of the spring 17 via the flange portion 13A at the back end of the rod 13. Push against it, switch plate 16 and terminal A14,
B15 is released, the switch means 7 is turned off, and the current supply to the pull coil 31 is cut off.

However, since current is supplied to the hold coil 32, the plunger 11 can be held at the second position II.

In this way, the pull coil 31 is
This is because, because the resistance is low, a large amount of current is passed in order to satisfy the attraction force at the beginning of movement of the plunger 11, and heat is easily generated.

On the other hand, since the hold coil 32 has a high resistance and the distance between the plunger 11 and the center post 5 is in a contact state or a close state, a large holding force can be obtained even with a small current.

In the solenoid having the above structure, when the coil portion 3 is energized, that is, when both the pull coil 31 and the hold coil 32 are energized, the plunger 11 is moved to the center post 5.
When it is magnetically attracted to the second position II, it is attracted to the plunger 11 from the end surface of the center post 5 due to its attractive force.
Since the rod 13 protruding to the side is pushed, the switch plate 16 is pushed against the spring force of the spring 17 via the flange portion 13A at the inner end thereof, the terminals A14 and B15 are separated from each other, and heat is generated. Since power supply to the easy pull coil 31 is automatically cut off, heat generation can be suppressed and control performance can be stably maintained.

Further, since the switch means 7 is automatically turned off when the plunger 11 forming the movable part K is in the second position II, the control device such as a timer is complicated as in the prior art. A simple control system is not required and control becomes easy.

In addition, the energization time to the pull coil 31 can be minimized, heat generation can be suppressed, and a high suction force can be obtained.

Further, since the switch plate 16 of the switch means 7 is pressed against the terminals A14 and B15 by the spring force of the spring 17, when the plunger 11 is held at the second position II, the so-called center post 5 is magnetically attracted. When the center post 5 is separated from the center post 5 due to a disturbance while being held, the rod 13 pushed by the suction force protrudes from the end surface of the center post 5 to the plunger 11 side, and the terminal portion is provided via the flange portion 13A. The switch plate 16 that has been pushed away from A14 and B15 is automatically contacted and connected to the terminals A14 and B15 by the spring force of the spring 17, so that the pull coil 31 is energized and the second Can return to position II.

Further, since the switch means 7 for the pull coil 31 is provided inside the solenoid S, only two lead wires 18 and 19 need to be taken out from the solenoid S (three in the prior art), and especially apart from the control system. When the solenoid S is installed at a different place, the cost can be reduced as compared with the related art.

In the structure of the switch means, when the movable member made of magnetic material is moved to the second position, the rod provided on the fixed member made of magnetic material so as to reciprocate is pushed and the resistance of the resistance member is reduced. Other configurations may be used as long as they interrupt the electric circuit leading to one of the lower first and second coil portions.

[0043]

As described above, according to the present invention,
To move the movable portion from the first position to the second position when the movable portion reaches the second position when the coil portion having the first coil portion and the second coil portion having different resistances is energized. Since the switch means for cutting off the electric circuit leading to the first coil portion having a low resistance necessary for the first coil portion is automatically provided, the power supply to the first coil portion having a low resistance which is easy to generate heat is automatically cut off. Therefore, the control performance can be stably maintained. Further, when the movable part is in the second position as described above, the switch means automatically turns on.
Since it is an FF, there is no need for a complicated control system provided with a control device such as a timer as in the prior art,
Control can be facilitated.

In addition, since the energization time to the first coil portion is the minimum necessary, heat generation is suppressed, and a high suction force can be obtained, the control performance can be improved.

Then, a movable member made of a magnetic material is used as the movable portion, and the second position of the movable member is a position magnetically attracted to the fixed member made of the magnetic material, and a shaft projecting to the movable member side to the fixed member. A movable contact that moves with the movement of the rod is provided on the back end side of the rod that is capable of reciprocating in the direction.
A fixed contact, which is connected to the movable contact, is provided toward the rear end side of the rod, and is connected to the first coil portion for moving the rod to the second position, and pressing for pressing the movable contact to the fixed contact side. When the coil part is held at the second position when the coil part is energized, when it is magnetically attracted to the so-called fixed member, it is separated from the fixed member by disturbance. In this case, the rod pushed by the suction force projects toward the movable member side from the end surface of the fixed member, and the movable contact pushed by the rod to be separated from the fixed contact is pushed by the pushing force of the pushing means. , Is automatically connected to the fixed contact, and the first coil is energized, so that the second position can be restored.

[Brief description of drawings]

FIG. 1 is a sectional view of a solenoid according to an embodiment of the present invention, and FIG. 1 (a) shows a state in which a coil portion is not energized (switch means ON). (B)
Shows the state when the coil portion is energized (switch means OFF).

FIG. 2 is a diagram of a control circuit for the solenoid of FIG.

3A is a cross-sectional view of a conventional solenoid, and FIG. 3B is a diagram of a control circuit of the solenoid of FIG. 3A.

[Explanation of symbols]

 1 case 2 plate 3 coil part 31 pull coil (first coil part) 32 hold coil (second coil part) 4 bobbin 41 front bobbin 42 rear bobbin 5 center post (fixing member) 51 through hole 6 upper plate 7 switch means 8 Cover 81 Recess 9 Guide 10 Bushing 11 Plunger (movable member) 12 Plunger rod 13 Rod 13A Flange 14 Terminal A (fixed contact) 15 Terminal B (fixed contact) 16 Switch plate (movable contact) 16A Convex 17 Spring (pressing means) ) 18, 19 Lead wire 20 Control circuit 21 Start switch 22 Power supply

Claims (2)

[Claims] 1. A coil unit having a first coil unit and a second coil unit having different resistances, and a movable unit, the movable unit comprising:
The magnetic attraction force generated when the coil portion is energized moves from the first position to the second position, and the coil portion with the higher resistance of the first and second coil portions maintains the second position. In the solenoid configured as described above, when the movable part is in the second position when the coil part is energized, the second part from the first position of the first and second coil parts
A solenoid having switch means for interrupting an electric circuit leading to a coil portion having a low resistance for moving to the position. 2. A coil portion having a first coil portion and a second coil portion having different internal hollow resistances, a movable member made of a magnetic material reciprocally inserted into the hollow portion of the coil portion, and the movable member. A fixed member made of a magnetic material and provided coaxially to face the member, and the movable member is magnetically attracted to the fixed member by energizing the coil portion, and the movable member is moved from the first position to the second position. A solenoid configured to move to a position and maintain a second position by a coil part having a high resistance among the first and second coil parts, wherein the fixed member reciprocates in an axial direction protruding toward the movable member. A movable rod is provided, and a movable contact that moves with the movement of the rod is provided on the far end side of the rod, and one of the first and second coil portions provided in contact with the movable contact toward the far end side of the rod. Move from position 1 to position 2 Solenoid, wherein a fixed contact is connected to the lower coil section resistance of order, in that a switching means and a pressing means for pressing said movable contact to the fixed contact side.