JP2006339380A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a small solenoid (short stroke) in which attraction (output) is enhanced and magnetic characteristics are also enhanced. <P>SOLUTION: The solenoid comprises a bobbin applied with a coil, a yoke arranged on the outside of the bobbin, a fixed core section located in the bobbin and having one end bonded to the yoke and an attracting surface formed at the distal end, and a movable core having an attracted surface opposing the attracting surface of the fixed core section. The attracting surface has a guide groove of a predetermined width formed at the central position of the fixed core section along the longitudinal direction, and a portion spreading equally to the right and left from the distal end of the guide groove toward the attracted surface. The attracted surface has a guide groove corresponding to the guide groove in the attracting surface formed in the center of an end face opposing the attracting surface along the longitudinal direction with a width equivalent to that of the fixed core section, and a portion spreading equally to the right and left from the center of the guide groove toward the proximal portion of the movable core. Guide members are arranged in the guide groove of the fixed core section and the guide groove of the movable core. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnet device (solenoid) used for an electromagnetic valve or the like, and relates to a structure of a solenoid that enhances an attractive force and further improves operational stability.

  In conventional DC solenoids, eddy current is generated inside the iron core when a current flows through the coil in the phenomenon from when a voltage is applied to the solenoid until the plunger is attracted and collides with the stopper (fixed iron core) and settles. Thus, there is a problem that the magnetomotive force is canceled and the rise of the magnetic flux is suppressed and the distribution is disturbed, and it is known that the generation of eddy currents is reduced by using the lamination method.

Further, in the solenoid of the laminated system, by providing a relative concave protrusion surrounded by a surface orthogonal to the laminated surface of both iron cores on each of the opposed surfaces of the fixed iron core and the plunger, There is known an AC solenoid that is opposed in a spaced manner (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 55-29204

  However, in FIG. 1 of Patent Document 1, as described above, the facing surface of the fixed iron core and the plunger opposed to each other has a gap, indicating that the facing surface is not a collision surface. ing. Further, as shown in the figure, the T-shaped shoulder portion is configured to collide with the iron core, so that a gap is also formed in the shoulder portion at the stage before the stroke, and the suction characteristics at the start are There is a disadvantage of being bad. Furthermore, when the plunger moves in a stroke, there is a high possibility that the plunger is displaced in the direction perpendicular to the sliding direction because there is a gap between the fixed iron core and the bobbin inner diameter portion where the plunger slides. For this reason, the positional relationship with the slopes facing each other in the interleaving portion is shifted or inclined. As a result, (1) the plunger is adsorbed on the adsorption surface during operation, or becomes inoperable, and the responsiveness deteriorates. In addition, friction is generated on the suction surface to reduce the durability, and as a result, dust and other dust are generated. (2) Stroke is not stable, and affects the performance of, for example, a solenoid valve that is a connecting portion. (3) The plunger is likely to vibrate, causing noise. There was a problem.

The present invention has been made to solve such a conventional problem, and its purpose is a small solenoid (short stroke), which improves the attractive force (output) and improves the magnetic characteristics of the solenoid. There is to make it.
Another object of the present invention is to provide a solenoid structure capable of improving the operability and increasing the attractive force.

  The solenoid of the present invention includes a bobbin formed by winding a coil, a yoke disposed outside the bobbin, a fixed iron core portion that is located inside the bobbin, has one end fixed to the yoke, and formed with an adsorption surface at the tip, In a solenoid composed of a movable core having a suction surface opposite to the suction surface of the fixed core portion, the suction surface provided at the tip of the fixed core portion has a predetermined width formed along the longitudinal direction at the center position of the fixed core portion. The guide surface of the movable core and an enlarged portion that expands evenly from side to side toward the attracted end surface, and the attracted surface of the movable iron core is at the center of the end face facing the attracted surface with the same width as the fixed core portion. It has a guide groove that matches the guide groove of the suction surface along the longitudinal direction, and an enlarged portion that extends evenly from the center of the guide groove toward the base of the movable iron core. The guide groove of the fixed iron core and the guide of the movable iron core In the groove And characterized by being arranged to guide member.

  According to the present invention, the guide groove and the enlarged portion connected to the guide groove are formed on the suction surface of the fixed iron core, and the guide groove and the enlarged portion connected to the guide groove are also provided on the attracted surface of the movable iron core (plunger) opposed thereto. Because it is formed, the suction area can be increased even with the same stroke as the conventional one, the suction force can be increased, and the center position of the fixed iron core and the movable iron core is not shifted by the guide mechanism, so the operability is improved and the magnetic The characteristics are also good.

In addition, by arranging the guide means at the center, the operability could be improved without affecting the magnetic characteristics.
Furthermore, since the yoke portion and the fixed core portion are integrated, the gap in the magnetic circuit (the connection portion between the yoke and the fixed core is eliminated) is reduced, and the performance is improved. Also, the number of parts can be reduced.

In addition, since the fixed part and the movable iron core are made of electromagnetic steel plates, the press workability is excellent and the magnetization characteristics are excellent, and it can be applied to a DC solenoid. In addition, material procurement is easy and cost reduction is possible. Further, annealing after lamination is not necessary.
Furthermore, it is possible to provide a solenoid with less noise and less vibration during operation of the movable iron core than in the past.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a solenoid valve 1 to which a solenoid 100 according to a first embodiment of the present invention is applied.
A solenoid valve 1 shown in FIG. 1 includes a main valve portion 10 and a solenoid 100 according to the present embodiment. The main valve portion 10 is a known one and is not particularly limited. Therefore, here, the solenoid 100 will be described in detail.

  The solenoid 100 includes a fixed portion 110, a movable iron core 120, a bobbin 130, and a coil 140. The upper and lower surfaces of the fixed portion 110 located outside are positioned by a cover 150 disposed outside the fixed portion 110. . The fixed portion 110 is formed of a substantially U-shaped yoke (junction) portion 111 disposed outside the bobbin 130, and a fixed iron core (stator) portion 112 that protrudes to the center thereof.

  The fixed portion 110 has a yoke portion 111 and a fixed iron core portion 112, and a guide groove having a predetermined width formed in the center position of the fixed iron core portion 112 along the longitudinal direction with the suction surface 112a at the tip of the fixed iron core portion 112. 113 and a thin plate 110a formed with an inclined surface 114 formed in a direction extending from the front end of the guide groove 113 toward the attracted surface 120a at a right and left equal angle is formed by stamping, and a predetermined number (this embodiment) In the embodiment, n magnetic steel sheets having a thickness T are stacked and fixedly integrated.

  On the other hand, as shown in FIG. 1 and FIG. 2, the movable core 120 has a suction surface 120 a at the front end facing the fixed core portion 112 side formed at a center position of the movable core 120 with a predetermined width along the longitudinal direction. The guide groove 122 is formed, and the inclined surface 123 is inclined in a mountain shape in a direction extending from the tip end of the guide groove 122 toward the both side surfaces at a uniform left-right angle. A punching process is performed to form a predetermined number of sheets (in this embodiment, n magnetic steel sheets having a thickness T), and they are fixedly integrated.

  A guide member (plate-shaped) 160 is mounted and fixed in the guide groove 113 on the fixed portion 110 side of the guide grooves 113 and 122 facing each other, and the tip protrudes further forward, and the movable iron core is provided there. 120 guide grooves 122 are formed so as to be slidably engaged with a minute gap, and the movable iron core 120 is always supported in a fitted state (both during suction and when released). Further, as shown in the drawing, the rear end side 121 of the movable iron core 120 is configured in a T shape as a whole so as to be disposed inside the yoke portion 111 with a minute gap.

Here, the guide groove 113 formed in the fixed iron core portion 112 and the guide groove 122 formed in the movable iron core 120 are formed to have the same width. In addition, the angles of the inclined surfaces 114 and 123 formed on the attracting surface 112a of the fixed iron core portion 112 and the attracted surface 120a of the movable iron core 120 are the same.
(Second embodiment)
FIG. 3 shows a solenoid according to a second embodiment of the present invention.

  In the present embodiment, guide means between the fixed member 110 and the movable iron core 120 are integrally formed on the bobbin 130 side. In the present embodiment, the guide member 132 is integrally formed at a substantially central position of the inner diameter 131 of the bobbin 130 so as to engage with both the guide groove 113 and the guide groove 122 when the bobbin 130 is attached to the fixed portion 110. is doing. The bobbin 130 is a non-magnetic material and is generally a resin or the like, and can be easily manufactured by an injection molding technique. By adopting such a configuration, it is possible to achieve a solenoid having a small number of parts and extremely good operability.

As in the first embodiment, the solenoid according to this embodiment is manufactured by pressing a thin plate of the fixed member 110 and the movable iron core 120.
(Third embodiment)
FIG. 4 shows a solenoid according to a third embodiment of the present invention.
This embodiment is a columnar plunger and a fixed iron core type solenoid that are similar to the conventional one. The attracting surface 210a and the attracted surface 220a are so-called conical shapes. In such a case, a guide groove 212 is formed at the distal end of the fixed iron core portion 210 having the conical adsorbing surface 210a, and the guide plate 230 is attached and fixed, while the adsorbed surface at the distal end of the plunger 220, which is a movable iron core, is formed. The guide groove 222 may also be formed in the conical portion 221 to be formed, and the guide plate 230 may be configured to be slidable into the guide groove 222.

In each of the above-described embodiments, the shape of the guide members 160, 132, and 230 is a plate shape, but it may be possible to have a shape like a round bar, but considering the improvement in productivity and cost reduction, Since the method of integrally processing the guide grooves 113, 122, 212, and 222 by pressing is preferable, the guide shape members 160, 132, and 230 can be easily formed into a plate shape.
The material of the guide member materials 160, 132, and 230 can be any non-magnetic material, and can be plastics or metal such as brass.

  Further, the shapes of the suction surfaces 112a, 113a, 210a and the attracted surfaces 120a, 220a of the fixed iron core portions 112, 210 and the movable iron cores 120, 220 are not necessarily limited to linear inclined surfaces or conical shapes. Even if it is circular (spherical shape), it can be similarly applied to flat suction surfaces.

It is front sectional drawing of the solenoid valve to which the solenoid which concerns on 1st embodiment of this invention is applied. It is a perspective view of the fixed member and movable iron core which are the components of the solenoid concerning a first embodiment of the present invention. It is a perspective view of a fixed member, a movable iron core, and a bobbin in a second embodiment of the present invention. It is a perspective view of a fixed member, a movable iron core, and a bobbin in a third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 10 Main valve part 100 Solenoid 110 Fixed part 110a, 120b Thin plate 111 Yoke part 112 Fixed iron core part 112a, 113a, 210a Adsorption surface 113,122,212,222 Guide groove 114,123 Inclined surface 120 Movable iron core 120a Adsorption Surface 123 Inclined surface 130 Bobbins 132, 160, 230 Guide member 140 Coil 150 Cover 220 Plunger 220a Tip cone

Claims (7)

A bobbin formed by winding a coil, a yoke disposed outside the bobbin, a fixed core part positioned inside the bobbin, having one end fixed to the yoke and having an adsorption surface at a tip, and the fixed core part In a solenoid composed of a movable iron core having an attracted surface opposite to the attracted surface,
The suction surface provided at the tip of the fixed core portion is a guide groove having a predetermined width formed along the longitudinal direction at the center position of the fixed core portion, and the left and right sides from the tip of the guide groove toward the suction end surface. And an expansion part that extends to
The attracted surface of the movable iron core has a guide groove that matches the guide groove along the longitudinal direction at the center of the end surface facing the attracting surface with the same width as the fixed iron core, and from the center of the guide groove to the base of the movable iron core. And an enlarged portion that expands evenly to the left and right,
A solenoid comprising a guide member disposed in the guide groove of the fixed iron core and the guide groove of the movable iron core.   2. The solenoid according to claim 1, wherein the movable iron core has a substantially T shape, and a rear end side has a width that is large enough to be accommodated within a yoke portion of the fixed portion. .   2. The solenoid according to claim 1, wherein the guide member is made of a nonmagnetic material, is fixed to the fixed iron core portion side, and is arranged to always slide in the movable iron core side guide groove. .   The solenoid according to any one of claims 1 to 3, wherein the guide member is integrally formed in the bobbin.   The suction surface of the fixed iron core portion has a guide groove having a predetermined width formed along the longitudinal direction at the center position of the fixed iron core portion, and a direction that expands from the tip of the guide groove toward the suction surface at a right and left equal angle. An inclined surface that is inclined, and the attracted surface of the movable iron core includes a guide groove that matches the guide groove of the fixed iron core portion, and an angled inclined surface that extends from the center of the guide groove to the left and right. The solenoid according to claim 1.   2. The solenoid according to claim 1, wherein the fixed iron core and the movable iron core are formed in a columnar shape, and a suction surface structure of both iron cores has a conical taper shape.   The fixed iron core portion is integrated by stamping and stacking a thin plate integrally formed with the yoke, and the movable iron core is integrated by punching and stacking by press processing. The solenoid according to 1.

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