JP4597799B2 - Solenoid switching valve - Google Patents

Description

  The present invention relates to a structure of an electromagnetic switching valve, and in particular, is a method of performing a switching operation of a main valve portion by a poppet valve method with a solenoid, and has a stroke position adjusting function on the solenoid side to match the stroke on the main valve portion side. The present invention relates to the structure of an electromagnetic switching valve.

  Conventionally, various poppet valve type electromagnetic switching valves have been proposed and widely used. In particular, when switching the main valve part of the poppet valve method by operating the solenoid, if the main valve stroke is too large for the suction characteristics of the solenoid, the suction force will be insufficient, resulting in malfunction and seal failure of the main valve part. On the contrary, if the solenoid stroke is too small, the opening amount of the poppet valve section is insufficient and the required flow rate cannot be flowed.If the solenoid stroke is smaller than the stroke on the main valve side, the main valve section There is a risk that the pressing force of the poppet sheet portion is insufficient, a sufficient sealing force cannot be obtained, and a sealing failure occurs. In such a case, the stroke amount in the solenoid structure is adjusted, and the stroke of the solenoid and the main valve stroke are finely adjusted so that a stable poppet seal can be achieved in consideration of the required amount of sealing of the poppet valve portion of the main valve portion. Had gone.

As a method of performing such fine adjustment, for example, as clearly shown in Japanese Utility Model Publication No. 3-22604, the fixed iron core (fixed core 14) is adjusted in and out in the operating direction, so that it can be adjusted between the movable iron core (plunger 9). A structure that enables this stroke adjustment has been known for a long time.
Japanese Utility Model Publication No. 3-22604

However, the method explicitly disclosed in Japanese Utility Model Publication No. 3-22604 is a method in which the fixed core 14 is movable with respect to the yoke 4, and a gap that lowers the magnetic efficiency structurally by this adjustment. Therefore, we devised measures such as enclosing magnetic fluid in the gap. Therefore, the structure is complicated, which is not preferable in practice.
The present invention has been made to solve such a conventional problem, and an object thereof is to achieve an optimal and stable sealing effect when a main valve having a poppet valve structure is controlled by a solenoid drive. An object of the present invention is to obtain a structure that enables the solenoid position fine adjustment mechanism of the above-mentioned with a simpler configuration.

Another object of the present invention is a poppet type electromagnetic switching valve, and in particular, to enable stable poppet valve switching by finely adjusting the stroke of a solenoid.
Furthermore, another object of the present invention is to suppress fluctuations in magnetic characteristics by providing a stroke adjusting means in a solenoid structure in which a yoke and a fixed iron core are integrally formed by a lamination method.

The present invention includes a bobbin formed by winding a coil, a fixed part formed by disposing a yoke part outside the bobbin and a fixed iron core inside the bobbin, and a movable iron core having a suction surface facing the fixed iron core. An electromagnetic switching valve having a built-in solenoid installed in the cover and mounted on the side surface of the main valve portion is provided with a position adjusting means for moving the yoke to the main valve portion side between the cover and the yoke. Is slidably guided with respect to the cover, and elastic means is disposed between the bobbin and the main valve portion so as to separate the fixed portion and the main valve portion.
The present invention also provides a movable core having a bobbin formed by winding a coil, a fixed part having a yoke part disposed outside the bobbin and a fixed core disposed inside the bobbin, and a suction surface facing the fixed core. In an electromagnetic switching valve in which a solenoid equipped with a built-in solenoid valve is mounted on the side of the main valve part, a position adjusting means for moving the yoke to the main valve part side is provided between the cover and the yoke. It is characterized by becoming.

  In the present invention, the yoke and the fixed iron core can be integrally formed. The main valve of the main valve portion can be a poppet valve structure. A fixed iron core and a movable iron core can be integrated by laminating thin plates. Position adjusting means for moving the yoke to the main valve portion side can be provided between the cover and the yoke. The main valve portion can be constituted by a main valve body incorporating a valve structure and an intermediate body having a connecting means between the movable iron core.

According to the present invention, since the stroke on the solenoid side is adjusted in accordance with the stroke of the poppet valve portion which is a valve structure built in the main valve portion, the entire fixed portion constituting the solenoid can be moved with respect to the solenoid cover. Easy adjustment from outside the solenoid cover.
Further, according to the present invention, by providing the connecting portion integrally with the movable iron core, the processing accuracy and the assembly accuracy are increased, the positional relationship when assembled is more accurate, and the adjustment is facilitated.

  Furthermore, according to the present invention, since the fixed part and the movable iron core, which are the main components of the solenoid, are laminated, the fixed iron core and the yoke can be integrally formed, and the movable iron core and its connecting part can be formed. They can be formed integrally and can be miniaturized.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 shows an electromagnetic switching valve 1 according to an embodiment of the present invention. In the electromagnetic switching valve 1 shown in FIG. 1, a main valve portion 10 is mounted on the right side and a solenoid 100 is mounted on the left side.
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 part 110 is composed of a substantially U-shaped yoke (junction) 111 disposed outside the bobbin 130 and a fixed iron core (stator) 112 protruding in the center.

  As shown in FIGS. 1 and 2, the fixed portion 110 includes a yoke 111 and a fixed iron core 112, and the center of the fixed iron core 112 is disposed on the end surface of the fixed iron core 112 on the suction side with the movable iron core 120. A first groove 113 formed at a predetermined width in the longitudinal direction of the fixed iron core 112 at a position, and a second groove formed by forming an inclined surface in a direction extending from the middle of the first groove 113 toward the end face at an equal angle to the left and right 114 is formed. Here, the thin plate 110a in which the first groove 113 and the second groove 114 are formed is formed by stamping, and a predetermined number of sheets (in this example, n pieces of electromagnetic steel sheets having a thickness T) are stacked, and It is formed by fixing and integrating. A guide member (plate-like) 160 is mounted and fixed in the first groove 113 on the fixing portion 110 side. The tip of the guide member 160 further protrudes forward toward the movable iron core 120.

  On the other hand, as shown in FIGS. 1 and 2, the movable iron core 120 is formed with a predetermined width in the longitudinal direction of the movable iron core 120 in the center position of the movable iron core 120 at the front end facing the fixed iron core 112 side. And a chevron 123 formed by forming an inclined surface in a direction extending from the tip end of the groove 122 toward the both side surfaces at an equal left-right angle. Here, similarly to the fixed portion 110, the thin plate 120a is formed by stamping, and a predetermined number (in this example, n pieces of electromagnetic steel plates having a thickness T) are stacked and fixed and integrated. ing. The groove 122 of the movable iron core 120 is arranged so that the guide member 160 protruding toward the movable iron core 120 is slidably engaged with a minute gap, and the movable iron core 120 is always fitted (at the time of suction and release). It is supported in a joint state. Further, the rear end side 121 of the movable iron core 120 is formed in a T shape as a whole so as to be disposed inside the yoke 111 with a minute gap.

  2, the bobbin 130 is integrally formed with flange portions 130b and 130c on both sides of the hollow cylindrical portion 130a, and on the flange portion 130c side, two surfaces further in the longitudinal direction are thick portions 130d and 130e. The bottomed holes 130f and 130g are formed in the end faces of the thick portions 130d and 130e, respectively. The upper and lower surfaces of the flange portions 130b and 130c are slightly recessed at the center in order to guide the inner surface portion of the yoke 111 of the fixed portion 110. A winding coil 140 is attached to the cylindrical portion 130 a of the bobbin 130.

  In the present embodiment, the solenoid 100 is inserted into the cover 150. At this time, as shown in FIGS. 1 to 3, grooves 151 and 152 having a size corresponding to the outside of the yoke 111 of the fixed portion 110 are formed vertically on the inner side of the cover 150 from the opening end surface to the bottom. Therefore, when the fixing portion 110 is inserted, when the vertical and horizontal directions of the fixing portion 110 are positioned by the grooves 151 and 152, the guides are held so as to be slidable along the grooves 151 and 152.

  Further, as shown in FIG. 2, compression coil springs 170a and 170b are inserted into the holes 130f and 130g of the bobbin 130, respectively, and are stretched between the side surfaces of the main valve portion 10. For this reason, the fixing portion 110 is pressed to the bottom side of the cover 150 by this spring force, and the fixing portion is fixed to the tip surface of the screw 180 that is screwed into the screw hole 153 at the center of the bottom surface of the cover 150. A side surface 110a of 110 is provided. Therefore, by operating the screw 180, the solenoid unit 100 can be pressed and moved in the direction of the main valve unit 10 against the spring force. That is, the coil springs 170 a and 170 b constitute elastic means for separating the fixed portion 110 and the main valve portion 10.

  On the other hand, the main valve portion 10 has a structure described in Japanese Patent Application No. 2005-075762 filed by the present applicant, and an intermediate body 10B is disposed between the main valve body 10A and the solenoid 100, Among them, the solenoid 100 side and the main valve portion 10 side are connected. More specifically, in the above-described movable iron core (plunger) 120 of the solenoid 100, only the thin plate portion positioned at the center portion in the thickness direction extends long and protrudes to form the connecting portion 124. Is connected to the poppet valve portion 12 of the main valve portion 10. The compression coil spring 20 is stretched between the connecting portion 124 and the bobbin 130, and the movable iron core 120 is pressed and held rightward in FIG. And with this pressing force, the poppet valve portion 12 is pushed rightward against the spring 21 supported on the opposite side and pushing the poppet valve portion 12 leftward. That is, in this example diagram, the spring 20 is set stronger than the spring 21.

  When an ON signal is input to the solenoid 100, the movable iron core 120 is attracted and moved to the left, the spring 20 is compressed to the left by this operation, and the poppet portion 12 is moved to the left by the force of the right spring 21. And valve switching is performed. Such an operation is performed. At this time, it is necessary to slightly increase the stroke of the solenoid 100 with respect to the valve stroke on the main valve portion 10 side, and by moving the entire solenoid 100 slightly in the valve operation direction. The structure can be adjusted. That is, by operating the screw 180 with a spanner or the like (not shown) and finely adjusting the fixing portion 110 in the left-right direction in FIG. (Solenoid stroke) can be set appropriately. That is, the screw 180 constitutes a position adjusting means for moving the yoke 111 to the main valve portion 10 side.

In the above-described embodiment, the connecting portion of the movable iron core 120 of the solenoid 100 is integrally formed. However, another part can be combined.
Further, the connecting mechanism on the movable iron core 120 side and the main valve part 10 side is not limited to the structure shown in the embodiment, and other mechanisms can be used.
Moreover, although the example which integrally formed the fixed iron core 112 and the yoke 111 was shown as the fixing | fixed part 110, it is not limited to it, It can apply similarly to the structure which separated and arranged the fixed iron core inside the yoke similarly to the former.

Moreover, although the poppet valve was illustrated as a main valve structure, it is not limited only to it, The valve structure by another type may be sufficient.
Further, the elastic means for pressing the yoke 111 is not limited to the compression coil springs 170a and 170b shown as the embodiment, and for example, a leaf spring or rubber can be similarly applied.
Further, the intermediate body shown in the above embodiment may be omitted.

  In addition, although an example in which a guide member (plate-like) 160 is mounted and fixed in the first groove 113 on the fixed portion 110 side is shown, the guide member may be formed integrally with the inner diameter portion of the bobbin 130 in the same manner. Can be implemented.

It is front sectional drawing of the electromagnetic switching valve which concerns on this invention. It is a perspective view of the fixed part and movable iron core which are the components of the solenoid of FIG. It is AA sectional drawing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 10 Main valve part 100 Solenoid 110 Fixed part 111 Yoke 112 Fixed iron core 113 1st groove | channel 114 2nd groove | channel 120 Movable core 130 Bobbin 140 Coil 150 Cover 160 Guide member 170a, 170b Compression coil spring 180 Screw

Claims (6)

A bobbin formed by winding a coil, a fixed part formed by arranging a yoke part outside the bobbin and a fixed iron core inside the bobbin, and a movable iron core having a suction surface facing the fixed iron core. Solenoid solenoid valve built in the cover and mounted on the main valve side,
A position adjusting means for moving the yoke to the main valve portion side is provided between the cover and the yoke,
The fixing portion is slidably guided with respect to the cover, and elastic means is disposed between the bobbin and the main valve portion so as to separate the fixing portion and the main valve portion. An electromagnetic switching valve.   The electromagnetic switching valve according to claim 1, wherein the yoke portion and the fixed iron core are integrally formed.   The electromagnetic switching valve according to claim 1 or 2, wherein the main valve of the main valve portion has a poppet valve structure.   The electromagnetic switching valve according to claim 2 or 3, wherein the fixed iron core and the movable iron core are integrated by laminating thin plates. The said main valve part consists of a main valve main body which incorporated the valve structure, and the intermediate body which has a connection means between the said movable iron cores, The Claim 1 thru | or 4 characterized by the above-mentioned. Solenoid switching valve. A bobbin formed by winding a coil, a fixed part formed by arranging a yoke part outside the bobbin and a fixed iron core inside the bobbin, and a movable iron core having a suction surface facing the fixed iron core. Solenoid solenoid valve built in the cover and mounted on the main valve side,
An electromagnetic switching valve comprising a position adjusting means for moving the yoke toward the main valve portion between the cover and the yoke.

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