JP7387244B2 - solenoid valve - Google Patents

Description

The present invention relates to a solenoid valve that opens and closes the valve using the magnetic force of an electromagnet.

A solenoid valve has a movable iron core placed inside a cylindrical solenoid that uses an electromagnet, and the magnetic force generated by the electric power supplied to the solenoid causes the movable iron core to move back and forth linearly, thereby controlling the open/closed state of the valve body. It is a valve that controls oil pressure and has been widely used for controlling oil pressure and water pressure because it is easy to control.

The solenoid valve shown in Patent Document 1 as such a solenoid valve is composed of a cylindrical solenoid, a fixed iron core and a movable iron core enclosed in a cylindrical tube member on the inside of the solenoid, and a magnetic material. It is equipped with a yoke that is placed outside of the solenoid and has a tube member passing through the through hole in the vertical direction.When power is supplied to the solenoid, magnetic flux is generated, and a magnetic path is formed in the yoke, which causes the movable iron core to move. moves smoothly toward the fixed core, and moves the valve body disposed below the movable core to an open state.

JP-A-8-285114 (Page 2, Figure 1)

However, in the solenoid valve as disclosed in Patent Document 1, the yoke has a U-shape with an open front, the lower plate is fixed to the case, and the upper plate is cantilevered. Therefore, the rigidity of the yoke was low. Therefore, when force is applied to the top plate of the yoke, the yoke deforms, causing the fixed core and movable core contained in the tube member that passes through the through hole of the yoke to tilt, potentially reducing the accuracy of the solenoid valve. Ta.

The present invention was made in view of these problems, and an object of the present invention is to provide a solenoid valve having a yoke whose top plate is difficult to deform.

In order to solve the above problems, the solenoid valve of the present invention has the following features:
A case having a fluid inflow path and an outflow path, a solenoid part having a solenoid, a fixed iron core, a movable iron core, and a valve body, and a yoke made of a magnetic material that surrounds the solenoid part and is attached to the case. A solenoid valve,
The yoke includes a lower plate placed on the case, an upper plate, a connecting plate connecting the lower plate and the upper plate, and an extension piece integrally extending downward from the upper plate. and,
A mounting portion is formed on the extending piece to be mounted on the case.
According to this, since the extending piece extending from the top plate of the yoke is supported by the case in addition to the connection plate, the top plate can be made difficult to deform. In addition, the extending piece cooperates with the connecting plate to form a magnetic path, improving magnetic efficiency.

The extending piece may be arranged at a position not facing the connecting plate.
According to this, the top plate is less likely to deform due to external forces from multiple directions.

At least one pair of the extending pieces may be provided, and the pair of extending pieces may be arranged to face each other.
According to this, since the pair of extending pieces arranged facing each other can be respectively fixed to the case, the top plate can be made difficult to deform due to external force, and the magnetic flux can pass through well.

The lower end of the lower surface plate may be arranged between the upper end and the lower end of the extension piece.
According to this, since the bottom plate and the extension piece are close to each other, a magnetic path is formed by the top plate, the extension piece, and the bottom plate, and the magnetic efficiency is improved.

The extending piece may include an ear portion whose end portion is bent outward, and the attachment portion may be formed in the ear portion.
According to this, the yoke can be fixed to the case from above.

The yoke may be formed by bending a single plate.
According to this, the number of parts constituting the yoke can be reduced.

FIG. 1 is a perspective view of a solenoid valve according to the present invention. FIG. 3 is a sectional view taken along line AA of the solenoid valve with its solenoid section energized. FIG. 3 is a perspective view of the yoke developed. It is a perspective view in the middle of manufacturing a yoke. It is a perspective view in the middle of manufacturing a yoke. It is a perspective view of a yoke. FIG. 3 is a sectional view taken along the line BB of the solenoid valve with the solenoid section de-energized. FIG. 7 is a perspective view showing a modification of the yoke.

EMBODIMENT OF THE INVENTION The form for implementing the electromagnetic valve based on this invention is demonstrated below based on an Example.

A solenoid valve according to an embodiment will be described with reference to FIGS. 1 to 7.

As shown in FIG. 1, the solenoid valve 1 controls the flow rate and pressure of fluids such as oil and water. A solenoid valve 1 that changes water/water cutoff as appropriate will be described.

As shown in FIGS. 1 and 2, the electromagnetic valve 1 includes a case 2 having a water inflow path 21 and an outflow path 22, a cylindrical solenoid 30, and an inner side of the solenoid 30. It has a solenoid part 3 which is mainly composed of a fixed iron core 31 and a movable iron core 32 and is attached above the case 2, and a yoke 4 which surrounds the solenoid part 3 from the outside.

The case 2 includes an inflow passage 21, an outflow passage 22, a bottomed cylindrical part 23 in which a storage recess 2A opening upward is formed and extends in the vertical direction, and a bottomed cylindrical part 23 extending in the outer diameter direction from the cylindrical part 23. It has a pair of protruding parts 24 that are generally triangular in top view. Furthermore, a recess 25 (see FIG. 7) that is rectangular in top view and opens upward is formed between the cylindrical portion 23 and the protruding portion 24, thereby reducing the weight of the case 2.

The inflow path 21 is formed to penetrate the cylindrical portion 23. Further, a protrusion 6 extending upward is formed in the bottom 2B of the accommodation recess 2A, and a through hole 60 is formed in the protrusion 6 to penetrate in the vertical direction and communicate with the outflow passage 22. There is. The protrusion 6 has an annular shape when viewed from above, and a valve seat 61 is formed at the upper end. Further, the solenoid portion 3 and the like are partially housed and placed in the cylindrical portion 23 . Further, the overhanging portion 24 is provided integrally with the cylindrical portion 23, and the yoke 4 is placed and fixed on the overhanging portion 24.

Next, the solenoid section 3 will be explained. The bobbin 8 is mainly molded from resin, and has a through hole 80 penetrating in the vertical direction and an annular opening 81 that is recessed in the inner diameter direction and opens in the outer diameter direction on the side. The fixed iron core 31 and the movable iron core 32 are arranged in a through hole 80 of the bobbin 8, and the solenoid 30 is formed and arranged by winding a copper wire around the opening 81. Furthermore, on the outer periphery of the lower side of the bobbin 8, an annular ring that is recessed in the inner radial direction and opened in the outer radial direction is formed by an upper annular collar 83a extending toward the outer diameter side and a lower annular collar 83b extending toward the outer diameter side. A recess 83 is formed, and an external fitting portion 40 (see FIG. 3) of a lower plate 4A of the yoke 4, which will be described later, is fitted into the recess 83.

The through hole 80 of the bobbin 8 is formed with a stepped portion 82 that partially projects toward the inner diameter side, and the annular convex portion 31a formed on the outer periphery of the fixed iron core 31 comes into contact with the stepped portion 82 from above. The fixed iron core 31 is restricted from moving vertically downward. The movable core 32 is disposed below the fixed core 31 via a compressed spring 32a. Further, a valve body 32b is integrally disposed at the lower end of the movable core 32, and the valve body 32b protrudes when the movable core 32 is biased downward in response to the biasing force of the spring 32a described above. It comes into contact with a valve seat 61 at the upper end of the portion 6.

The outer circumferences of the solenoid 30 and the bobbin 8 are covered with a mold 9. The mold 9 is mainly molded from resin, and is provided with a terminal 91 extending in the outer diameter direction on the upper side. The terminal 91 is electrically connected to the solenoid 30, and when electric power is supplied to the terminal 91, magnetic flux is generated around the solenoid 30.

The movable core 32 is magnetically attracted to the fixed core 31 disposed above by the magnetic flux generated when the solenoid 30 is energized, and the valve body 32b disposed below the movable core 32 is attracted upwardly together with the movable core 32. Move to. As a result, as shown in FIG. 2, the valve body 32b and the valve seat 61 are in a separated state, that is, the valve body 32b is in an open state, and at this time, the solenoid valve 1 is in a state where water is flowing. The water passes through the through hole 60 of the protrusion 6 and flows to the outflow path 22. On the other hand, when power is not supplied to the terminal 91, the movable core 32 is constantly urged downward by the spring 32a, and the valve body 32b is in a closed state, that is, the valve body 32b is in a closed state. Therefore, the solenoid valve 1 is in a water-stop state, in other words, in a closed state.

Next, the yoke 4 will be explained. The yoke 4 is arranged outside the mold 9. The yoke 4 is molded from a magnetic material, and by surrounding the mold 9 with the yoke 4, a magnetic path is configured to collect the magnetic flux generated when the solenoid 30 is energized. As will be described later, the yoke 4 also functions as a housing for the solenoid section 3.

As shown in FIG. 6, the yoke 4 has a substantially cubic shape with an open front surface. The yoke 4 includes a lower plate 4A placed on the upper end surface 23a (see FIG. 2) of the cylindrical portion 23 of the case 2, an upper plate 4B facing the lower plate 4A and parallel to each other, and a lower plate 4A and an upper plate. It is composed of a connecting plate 4C that connects the face plate 4B and is perpendicular thereto, and extension pieces 4D and 4E that integrally extend downward from the top plate 4B.

The lower plate 4A includes an outer fitting portion 40 having a substantially U-shaped notch extending from the front end to the center. The outer fitting part 40 has an arcuate profile approximately the same size as the circumferential surface 83c formed between the upper annular collar 83a and the lower annular collar 83b of the bobbin 8 (see FIG. 2). It can be externally fitted into the recess 83 of No.8. Further, as will be described later, the end portions of the extension pieces 4D and 4E are each bent outward at a substantially right angle to form an ear portion 42, respectively. That is, the extending pieces 4D and 4E are formed from a hanging piece extending downward from the top plate 4B, and an ear part 42 extending outward so as to intersect the hanging piece.

A through hole 41 serving as a mounting portion is formed in each ear portion 42 of the extending pieces 4D, 4E. The through holes 41 are capable of being screwed into hole portions 2a of the projecting portion 24 of the case 2, which will be described later, using headed screws 7 (see FIG. 7).

Next, manufacturing of the yoke 4 will be explained. A T-shaped plate 4' shown in FIG. 3, which is formed by press working and has a substantially T-shape when viewed from above, is prepared. First, by bending the two central pieces of the T-shaped plate 4' approximately 90 degrees, the connecting plate 4C is raised approximately perpendicular to the bottom plate 4A, and the top plate 4B is made parallel to the bottom plate 4A. , the shape is shown in FIG.

Next, from the state shown in FIG. 4, by bending the pair of side pieces of the T-shaped plate 4' downward approximately 90 degrees, the pieces 4D and 4E extending from the top plate 4B are directed downward. It has the shape shown in FIG. Inwardly recessed slits S are formed at the locations where the upper surface plate 4B and the connecting plate 4C are adjacent to each other, so that the extension pieces 4D and 4E can be easily bent downward.

Finally, from the state shown in FIG. 5, the lower portions of the extension pieces 4D and 4E are bent outward to form the ears 42, and the manufacture of the yoke 4 is completed, as shown in FIG. It becomes a shape. At this time, the lower surface 4a of the lower surface plate 4A is located slightly below the lower surface 42a of each ear portion 42.

Next, the assembly of the solenoid valve 1 will be explained. First, the solenoid 30 is placed on the bobbin 8, and then the mold 9 is covered. Next, the fixed iron core 31 fitted with the O-ring 11 is inserted from above into the through hole 80 of the bobbin 8, and fixed in the bobbin 8, and the movable iron core is assembled with the spring 32a and the valve body 32b from below. 32 is inserted, and the solenoid part 3 is unitized.

Next, by fitting the external fitting part 40 of the yoke 4 into the recess 83 of the bobbin 8, the yoke 4 is attached to the unitized solenoid part 3. At this time, the vertical position of the bobbin 8 is determined by the lower surface plate 4A of the yoke 4, and the vertical position of the fixed core 31 is determined by having its upper end abut against the lower surface of the upper surface plate 4B of the yoke 4. There is.

Thereafter, the O-ring 10 is attached to the lower side of the lower annular collar 83b of the bobbin 8, and the O-ring 10 is inserted and placed in the housing recess 2A of the case 2. At this time, the lower surface plate 4A of the yoke 4 is supported by coming into contact with the upper end surface 23a of the cylindrical portion 23 of the accommodation recess 2A.

Finally, align the through holes 41 of the ear portion 42 with the holes 2a and 2b into which the female screws of the overhanging portion 24 of the case 2 are screwed, respectively, and insert the headed screw 7 into the holes 2a and 2b from above. They are screwed together to complete the assembly of the solenoid valve 1.

As described above, the yoke 4 before the electromagnetic valve 1 is assembled is formed such that the lower surface 4a of the lower plate 4A is located slightly below the lower surface 42a of the ear portion 42, so the yoke 4 is fixed by the headed screw 7. When the solenoid valve 1 is fixed to the case 2, the lower plate 4A is slightly bent upward, so the lower plate 4A does not come off the case 2, and the solenoid valve 1 is assembled with high accuracy. In addition, the lower surface 4a of the lower surface plate 4A and the lower surface 42a of the ear part 42 may be made to have substantially the same height.

Further, as shown in FIGS. 1 and 7, the yoke 4 is arranged so as to cover the top surface, both side surfaces, the back surface, and the bottom surface of the solenoid section 3. In addition to protecting the yoke 4 from external forces, the magnetic flux generated when power is supplied to the solenoid 30 passes through the yoke 4, which forms part of the magnetic path, so the movable core 32 can be magnetically attached to the fixed core 31 with a small amount of electric power. It is now possible to do so.

As explained above, the yoke 4 includes a lower plate 4A placed on the case 2, an upper plate 4B, a connecting plate 4C, and an extending piece 4D. , an ear portion 42 serving as a mounting portion to be attached to the case 2 is formed. Because of this, the yoke 4 is supported by the case 2 not only by the connecting plate 4C but also by the extension piece 4D, making it difficult to deform the top plate 4B. In addition, the extending piece 4D cooperates with the connecting plate 4C to form a magnetic path, improving magnetic efficiency.

As described above, since the yoke 4 has high rigidity, the top plate 4B is difficult to deform even if force is applied to the yoke 4 from outside the solenoid valve 1. In addition, even if the fluid pressure inside the case 2 is high when the water is stopped, and the force due to the fluid pressure acts on the fixed core 31, and even if the fixed core 31 exerts an upward force on the yoke 4, the upper surface plate 4B is difficult to deform. Furthermore, the upper surface plate 4B is designed to be resistant to deformation even in response to vibrations caused by the fixed iron core 31 and the movable iron core 32 being magnetically attached to each other as the electromagnetic valve 1 opens and closes.

Moreover, since the extending piece 4D is arranged at a position not facing the connecting plate 4C, the upper surface plate 4B is difficult to deform due to external forces from a plurality of directions.

Further, at least one pair of extension pieces 4D, 4E is provided, and since the pair of extension pieces extend from the top plate 4B of the yoke 4 to face each other, the extension pieces 4D, 4E can be fixed to the case 2, respectively, making it difficult for the top plate 4B to deform due to external force.

Further, since the lower end of the lower plate 4A is arranged between the upper end and the lower end of the extension pieces 4D, 4E, the lower plate 4A and the extension pieces 4D, 4E are close to each other, so the upper plate 4B A magnetic circuit is formed by the extension pieces 4D, 4E and the lower plate 4A, and magnetic efficiency is improved.

Further, the extension piece 4D has an ear portion 42 formed by bending the end portion outward, and a through hole 41 as a mounting portion is formed in the ear portion 42, so that the yoke 4 can be attached to the case. 2 from above.

Further, since the yoke 4 is formed by bending a single plate, the number of parts constituting the yoke 4 can be minimized.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions that do not depart from the gist of the present invention are included in the present invention. It will be done.

For example, the manufacturing procedure for the yoke 4 has been described as standing up the connecting plate 4C from the bottom plate 4A and bending the top plate 4B so that it is parallel to the bottom plate 4A. Pieces 4D and 4E may be started up first.

Further, in the above embodiment, the T-shaped plate 4' having a substantially T-shape when viewed from above is formed by press working. You can also do it.

Further, in the above embodiment, the yoke 4 is screwed and fixed to the case 2 using the headed screw 7, but the present invention is not limited to this, and the yoke 4 may be fixed to the case 2 by welding, Alternatively, it may be fixed by concave-convex fitting.

Further, in the embodiment, the lower surface plate 4A of the yoke 4 is arranged at approximately the same height as the lower ends of the ears 42 and the extension pieces 4D, 4E, but the present invention is not limited to this. The lower end of the ear part or the extending piece may be arranged downward.

Further, in the embodiment, two extension pieces are extended from the upper surface plate 4B, but the present invention is not limited to this, and the number of extension pieces may be one or three or more.

Further, in the embodiment described above, the extension piece 4D is bent to form the ear portion 42, and the headed screw 7 is inserted from above into the through hole 41 and fixed to the case 2. However, the present invention is not limited to this. A headed screw may be inserted from the side side into a through hole extending in the side direction of an extension piece extending vertically downward from the top plate and fixed to the case.

Further, in the above embodiment, the yoke 4 has a substantially cubic shape with an open front surface, but the present invention is not limited to this. It may also have a shape including a piece and a connecting plate (see FIG. 8).

1 Solenoid valve 2 Cases 2a, 2b Hole 3 Solenoid 4 Yoke 4A Lower plate 4B Upper plate 4C Connection plates 4D, 4E Extension piece 6 Projection 7 Headed screw 8 Bobbin 9 Mold 21 Inflow path 22 Outflow path 23 Cylindrical Part 24 Overhanging part 30 Solenoid 31 Fixed core 32 Movable core 40 External fitting part 41 Through hole (mounting part)
42 Ears

Claims (5)

A case having a fluid inflow path and an outflow path, a solenoid part having a solenoid, a fixed iron core, a movable iron core, and a valve body, and a yoke made of a magnetic material that surrounds the solenoid part and is attached to the case. A solenoid valve,
The yoke includes a lower plate placed on the case, an upper plate, a connecting plate connecting the lower plate and the upper plate, and an extension piece integrally extending downward from the upper plate. and a mounting portion that is attached to the case is formed on the extension piece,
The lower end of the lower plate is located between the upper end and the lower end of the extension piece,
The lower plate is a solenoid valve that extends to a position where a side surface of the lower plate faces the extension piece . The electromagnetic valve according to claim 1, wherein the extending piece is arranged at a position not facing the connecting plate. 3. The electromagnetic valve according to claim 1, wherein at least one pair of the extending pieces is provided, and the pair of extending pieces are arranged to face each other. 4. The electromagnetic valve according to claim 1 , wherein the extending piece has an ear portion whose end portion is bent outward, and the attachment portion is formed in the ear portion. 5. The electromagnetic valve according to claim 1, wherein the yoke is formed by bending a single plate.

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