JP2017180795A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which stabilizes a size of a gap between a movable iron core and a fixed iron core.SOLUTION: A solenoid valve includes: a fixed iron core 40; a movable iron core 50 which may slide in a direction which moves close to or away from the fixed iron core 40; a valve body 60 which is connected with the movable iron core 50 and may open or close a fluid passage 13; and a restriction member 80 which is formed by a non-magnetic metal and restricts sliding of the movable iron core 50 so as to prevent a gap between the movable iron core 50 and the fixed iron core 40 from becoming smaller than a predetermined value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technology of a solenoid valve having a fixed iron core and a movable iron core.

  Conventionally, the technology of a solenoid provided with a fixed iron core and a movable iron core is known. For example, as described in Patent Document 1.

  The solenoid described in Patent Literature 1 includes a fixed iron core and a movable iron core that is slidable in a direction close to or away from the fixed iron core. The solenoid is movable so that a gap (gap) of a predetermined value or more is generated between the movable iron core and the fixed iron core when the movable iron core slides in a direction close to the fixed iron core. A rubber stopper (rubber washer) is provided on the iron core.

  By comprising in this way, when a movable iron core adjoins a fixed iron core, a clearance gap is ensured between the said movable iron core and a fixed iron core, and the bad influence by a residual magnetism can be reduced. Further, by using a rubber stopper, it is possible to suppress the generation of sound when the stopper restricts the sliding of the movable iron core (when contacting the other member). Such a technique can also be applied to a valve (solenoid valve).

  However, when a rubber stopper is used as in the technique described in Patent Document 1, since the stopper is easily elastically deformed, it is disadvantageous in that the size of the gap between the movable iron core and the fixed iron core is difficult to stabilize. Met.

JP-A-7-263221

  The present invention has been made in view of the situation as described above, and the problem to be solved is to provide a solenoid valve capable of stabilizing the size of the gap between the movable iron core and the fixed iron core. is there.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the fixed iron core, the movable iron core slidable in a direction close to or away from the fixed iron core, and the movable iron core are connected to open and close the fluid flow path. And a regulating member that is made of a nonmagnetic metal and regulates sliding of the movable iron core so that a gap between the movable iron core and the fixed iron core does not become less than a predetermined value. It is.

  According to a second aspect of the present invention, the restricting member is disposed between the movable iron core and the fixed iron core, and the movable iron core and the fixed core when the movable iron core approaches the fixed iron core. By abutting against the iron core, sliding of the movable iron core is regulated.

  In Claim 3, any one of the said fixed iron core or the said movable iron core comprises the convex part formed in the center part of the surface facing either the said fixed iron core or the said movable iron core. The other of the fixed iron core and the movable iron core is formed at the center of the surface facing either the fixed iron core or the movable iron core, and the movable iron core is formed on the fixed iron core. A concave portion capable of accommodating the convex portion when approaching is provided, and the restricting member is fixed to a base portion of the convex portion.

  According to a fourth aspect of the present invention, the restricting member is fixed to the base portion of the convex portion in a state fitted from the outer peripheral side.

  According to a fifth aspect of the present invention, the base of the convex portion has an outer peripheral surface formed perpendicular to the radial direction.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, the size of the gap between the movable iron core and the fixed iron core can be stabilized.

  In Claim 2, the clearance gap between a movable iron core and a fixed iron core is securable with sufficient precision.

  In Claim 3, the efficiency of the assembly | attachment operation | work of a control member can be achieved.

  According to the fourth aspect of the present invention, it is possible to improve the efficiency of the assembling work of the regulating member.

  According to the fifth aspect, the restricting member can be firmly fixed.

The front sectional view showing the composition of the solenoid valve concerning one embodiment of the present invention. Similarly, an enlarged front sectional view. The exploded view (partial sectional view) showing a fixed iron core, a movable iron core, and a regulating member. (A) The top view which showed the control member. (B) Similarly, AA sectional drawing. (A) The top view which showed the control member which concerns on a modification. (B) Similarly, BB sectional drawing.

  In the following, the directions indicated by arrow U, arrow D, arrow F, arrow B, arrow L and arrow R in the figure are defined as upward, downward, forward, backward, leftward and rightward, respectively. To explain.

First, the configuration of the solenoid valve 1 according to an embodiment of the present invention will be described with reference to FIGS.
In FIGS. 1 and 2, a state in which the coil 30 described later is not energized is shown to the right of the center line (dashed line), and a state in which the coil 30 is energized to the left of the center line is shown.

  A solenoid valve 1 shown in FIGS. 1 and 2 opens and closes a fluid flow path (flow path) using the magnetic force of an electromagnet (solenoid). The solenoid valve 1 mainly includes a housing 10, a bobbin 20, a coil 30, a fixed iron core 40, a movable iron core 50, a valve body 60, a spring 70, and a regulating member 80.

  The housing 10 shown in FIG. 1 is a substantially box-shaped member in which a fluid flow path is formed. The housing 10 mainly includes a concave portion 11, a valve seat portion 12, and a flow path 13.

  The recess 11 is a part formed so as to be recessed downward from the upper surface of the housing 10. The recess 11 is formed at the center of the upper surface of the housing 10. The recess 11 is formed to have a substantially circular shape in plan view.

  The valve seat part 12 is a part formed so that the bottom face of the recessed part 11 may protrude upward. The valve seat portion 12 is formed at the center of the bottom surface of the recess 11. The valve seat portion 12 is formed to have a substantially cylindrical shape (a substantially circular shape in plan view).

  The channel 13 is a passage for guiding fluid. The flow path 13 is formed in the housing 10. One end of the flow path 13 is opened at the center of the upper surface of the valve seat 12.

  In the housing 10 thus formed, the recess 11 is connected to another flow path (flow path different from the flow path 13) (not shown). That is, the flow path is connected to the flow path 13 via the recess 11. The fluid flowing from the flow path can flow into the flow path 13 through the recess 11.

  The bobbin 20 is a member provided with a coil 30 described later. The bobbin 20 is formed in a substantially cylindrical shape whose axis is directed in the vertical direction. The upper and lower ends of the bobbin 20 are enlarged in diameter and formed in a flange shape. The lower end of the bobbin 20 is fixed to the upper surface of the housing 10 via the support member 21. The hollow portion of the bobbin 20 communicates with the concave portion 11 of the housing 10.

  The coil 30 is formed by winding a copper wire around the bobbin 20. The coil 30 is formed from the upper end to the lower end of the bobbin 20.

  The fixed iron core 40 shown in FIGS. 1 to 3 is a member formed of a magnetic metal. The fixed iron core 40 is formed in a substantially cylindrical shape whose axis is directed in the vertical direction. The fixed iron core 40 is mainly formed with a convex portion 41 and a flat portion 42.

  The convex portion 41 is formed on one end surface (bottom surface) of the fixed iron core 40. The convex part 41 is formed so that the center part of the bottom face of the fixed iron core 40 protrudes downward. The convex portion 41 mainly includes a base portion 41a and a truncated cone portion 41b.

  The base portion 41a forms a portion (upper portion) on the base side of the convex portion 41. The base 41a is formed in a substantially columnar shape (substantially circular shape in a plan sectional view) with the axis line directed in the vertical direction. That is, the outer peripheral surface of the base 41a is formed to be perpendicular to the radial direction.

  The truncated cone portion 41 b forms a portion (lower portion) on the tip end side of the convex portion 41. The truncated cone portion 41b is formed below the base portion 41a. The truncated cone portion 41b is formed in a substantially truncated cone shape having a diameter that decreases downward. The diameter of the upper end part of the truncated cone part 41b is formed to be the same as the diameter of the base part 41a. Accordingly, the surfaces (outer peripheral surfaces) of the base portion 41a and the truncated cone portion 41b are formed so as to be smoothly continuous without a step.

  The flat part 42 is formed on the outer peripheral part (outside the convex part 41) of one end face (bottom face) of the fixed iron core 40. The flat portion 42 is formed in a flat shape facing downward. The flat part 42 is formed in an annular shape surrounding the convex part 41 when viewed from the bottom.

  The fixed iron core 40 thus formed is disposed at the upper end of the hollow portion of the bobbin 20 and is appropriately fixed to the bobbin 20. As a result, the fixed iron core 40 cannot move relative to the coil 30.

  The movable iron core 50 is a member formed of a magnetic metal. The movable iron core 50 is formed in a substantially cylindrical shape whose axis is directed in the vertical direction. The movable iron core 50 is mainly formed with a recess 51 and a flat portion 52.

  The recess 51 is formed on one end surface (upper surface) of the movable iron core 50. The recessed part 51 is formed so that the center part of the upper surface of the movable iron core 50 is recessed downward. The recess 51 is formed in a substantially truncated cone shape whose diameter decreases as it goes downward. The inner peripheral surface of the concave portion 51 is formed to be parallel to the outer peripheral surface of the truncated cone portion 41 b of the convex portion 41.

  The flat portion 52 is formed on the outer peripheral portion (outside the recess 51) of one end surface (upper surface) of the movable iron core 50. The flat portion 52 is formed in a flat shape facing upward. The flat portion 52 is formed in an annular shape surrounding the concave portion 51 in plan view. The outer diameter of the flat portion 52 (the outer diameter of the movable iron core 50) is formed to be substantially the same as the outer diameter of the flat portion 42 of the fixed iron core 40 (the outer diameter of the fixed iron core 40).

  The movable iron core 50 thus formed is disposed in the hollow portion of the bobbin 20 (below the fixed iron core 40). The movable iron core 50 is supported so as to be slidable in the vertical direction with respect to the bobbin 20. The concave portion 51 of the movable iron core 50 accommodates the lower portion of the convex portion 41 of the fixed iron core 40. The lower end portion of the movable iron core 50 is disposed so as to protrude from the hollow portion of the bobbin 20 into the recess 11 of the housing 10.

  The valve body 60 shown in FIG. 1 opens and closes a fluid flow path. The valve body 60 is formed in a substantially cylindrical shape whose axis is directed in the vertical direction. The valve body 60 is fixed to the lower end of the movable iron core 50. The valve body 60 is disposed so as to face the valve seat portion 12 (the upper end of the flow path 13) of the housing 10 in the vertical direction.

  The spring 70 is formed by a compression coil spring. The spring 70 is disposed with its axis line directed in the vertical direction. One end (upper end) of the spring 70 is brought into contact with the bottom surface of the bobbin 20 (support member 21). The other end (lower end) of the spring 70 is brought into contact with a receiving member 71 fixed to the valve body 60. As a result, the spring 70 constantly urges the valve body 60 downward.

  The regulating member 80 shown in FIGS. 1 to 4 regulates the sliding of the movable iron core 50. The regulating member 80 is made of a nonmagnetic metal. In the present embodiment, the restriction member 80 is formed of stainless spring steel (stainless steel for springs). The regulating member 80 is formed by bending a rod-like member having a circular cross section into a substantially circular shape (C shape) in plan view. The inner diameter of the restriction member 80 in plan view is formed to be slightly smaller than the outer diameter of the base portion 41a of the fixed iron core 40.

  The regulating member 80 formed in this way is fitted to the base 41a of the fixed iron core 40 from the outside. At this time, the restricting member 80 is slightly expanded in diameter. For this reason, the restricting member 80 is fixed to the base portion 41 a by a force for reducing the diameter of the restricting member 80. Further, the restricting member 80 is disposed so as to contact the flat portion 42 of the fixed iron core 40.

  Although not shown in FIGS. 1 and 2, the bobbin 20, the coil 30, and the like (members disposed above the housing 10) are appropriately covered with a box-like casing or the like.

  Below, a mode that sliding of the movable iron core 50 is controlled by the control member 80 is demonstrated using FIG.1 and FIG.2.

  When the coil 30 is not energized, the valve body 60 slides downward by the urging force of the spring 70 and contacts the valve seat portion 12 as shown on the right side of the center line in FIGS. As a result, the flow path 13 opened in the valve seat portion 12 is closed, and the recess 11 and the flow path 13 of the housing 10 are blocked. In this state, the fluid cannot flow from the recess 11 to the flow path 13. That is, in a state where the coil 30 is not energized, the fluid flow path 13 flowing through the housing 10 can be closed.

  In this case, the upper surface (plane portion 52) of the movable iron core 50 is separated from the regulating member 80.

  When the coil 30 is energized, a magnetic circuit G is formed around the coil 30 as indicated by a two-dot chain line in FIG. Specifically, the magnetic circuit G is formed so as to cover the radially inner side, the upper side, the radially outer side, and the lower side of the coil 30 in a sectional view (FIG. 2). The magnetic circuit G is formed along the movable iron core 50, the fixed iron core 40, the casing (not shown), and the like made of magnetic metal.

  When the magnetic circuit G is formed around the coil 30, the movable iron core 50 is slid upward against the urging force of the spring 70 as shown on the left side of the center line in FIGS. 1 and 2. When the movable iron core 50 slides upward, the valve body 60 slides upward together with the movable iron core 50 and is separated from the valve seat portion 12. As a result, the flow path 13 opened in the valve seat portion 12 is opened. In this state, fluid can flow from the recess 11 to the flow path 13. That is, in a state where the coil 30 is energized, the fluid flow path 13 flowing through the housing 10 can be opened.

  Further, when the movable iron core 50 slides upward to a predetermined position, the movable iron core 50 comes into contact with the regulating member 80, and the sliding is regulated. In a state where sliding of the movable iron core 50 is regulated (a state where the movable iron core 50 is in contact with the regulating member 80), there is a gap of a predetermined size between the fixed iron core 40 and the movable iron core 50. It is formed. In this way, the sliding of the movable iron core 50 is regulated by the regulating member 80 so that the gap between the movable iron core 50 and the fixed iron core 40 does not become less than a predetermined value. That is, the fixed iron core 40 and the movable iron core 50 are not in direct contact with each other, and a gap having a predetermined size is secured between the fixed iron core 40 and the movable iron core 50. Thus, since the fixed iron core 40 and the movable iron core 50 do not contact directly, the adverse effect on the operation of the solenoid valve 1 due to the residual magnetism can be reduced.

  The size of the gap between the fixed iron core 40 and the movable iron core 50 is determined by the size of the regulating member 80. Specifically, the size of the gap is determined by the thickness of the regulating member 80 in the vertical direction. Here, the regulating member 80 is formed of a nonmagnetic metal. Therefore, it is hard to be elastically deformed compared with the case where the regulating member 80 is made of an elastic material such as rubber, and the size of the gap between the fixed iron core 40 and the movable iron core 50 can be stabilized. Specifically, when the movable iron core 50 slides upward, a gap having a substantially constant size can always be ensured between the movable iron core 50 and the fixed iron core 40. Thus, by stabilizing the size of the gap between the fixed iron core 40 and the movable iron core 50, the operation (opening / closing operation) of the solenoid valve 1 can be performed stably.

  In addition, since the size of the gap between the fixed iron core 40 and the movable iron core 50 can be adjusted by adjusting the size of the regulating member 80, the size of the gap can be adjusted accurately and easily. Can do. In particular, the adjustment can be made more accurately than when the regulating member 80 is formed of an elastic material such as rubber.

  Further, by arranging the regulating member 80 in the middle of the magnetic circuit G, that is, between the fixed iron core 40 and the movable iron core 50, the size of the gap between the fixed iron core 40 and the movable iron core 50 can be more accurately determined. Adjustments can be made.

  Further, by arranging the regulating member 80 inside the coil 30 (bobbin 20), it is possible to make it difficult for the abnormal sound when the movable iron core 50 comes into contact with the regulating member 80 to leak outside (outside the coil 30). .

As described above, the solenoid valve 1 according to the present embodiment is
A fixed iron core 40;
A movable iron core 50 slidable in a direction close to or away from the fixed iron core 40;
A valve body 60 connected to the movable iron core 50 and capable of opening and closing the fluid flow path 13;
A regulating member 80 that is made of a non-magnetic metal and regulates the sliding of the movable iron core 50 so that the gap between the movable iron core 50 and the fixed iron core 40 does not become less than a predetermined value;
It comprises.

By comprising in this way, the magnitude | size of the clearance gap between the movable iron core 50 and the fixed iron core 40 can be stabilized.
That is, the regulating member 80 made of a non-magnetic metal is less likely to be elastically deformed (is less likely to bend) than an elastic member such as rubber, so that a substantially constant gap is secured between the movable iron core 50 and the fixed iron core 40. be able to.

The regulating member 80 is
The movable iron core is disposed between the movable iron core 50 and the fixed iron core 40, and comes into contact with the movable iron core 50 and the fixed iron core 40 when the movable iron core 50 comes close to the fixed iron core 40. 50 sliding is regulated.

By comprising in this way, the clearance gap between the movable iron core 50 and the fixed iron core 40 can be ensured with sufficient precision.
That is, since the regulating member 80 is brought into direct contact with the movable iron core 50 and the fixed iron core 40 to regulate the sliding of the movable iron core 50, the dimensional error can be reduced as compared with the case where the regulation is performed indirectly. it can.

The fixed iron core 40 is
Providing a convex portion 41 formed at the center of the surface facing the movable iron core 50,
The movable iron core 50 is
Formed in the center of the surface facing the fixed iron core 40, and provided with a recess 51 that can accommodate the protrusion 41 when the movable iron core 50 is close to the fixed iron core 40;
The restricting member 80 is fixed to the base portion 41 a of the convex portion 41.

By comprising in this way, the efficiency of the assembly | attachment operation | work of the control member 80 can be achieved.
That is, since the restriction member 80 can be disposed at a position where it can be easily seen as compared with the case where the restriction member 80 is disposed in the recess 51, the assembly of the restriction member 80 can be easily confirmed. As a result, the efficiency of the assembly work can be improved. Further, by fixing the regulating member 80, it is possible to prevent the regulating member 80 from moving and interfering with other members or generating abnormal noise.

The regulating member 80 is
The base 41a of the convex portion 41 is fixed in a state of being fitted from the outer peripheral side.

By comprising in this way, the efficiency of the assembly | attachment operation | work of the control member 80 can be achieved.
That is, since the regulating member 80 can be easily fixed, the efficiency of the assembling work can be improved.

The base 41a of the convex portion 41 is
It has an outer peripheral surface formed perpendicular to the radial direction.

By comprising in this way, the control member 80 can be fixed firmly.
That is, since the force (force to reduce the diameter) from the regulating member 80 can be received on a surface perpendicular to the force (an outer circumferential surface perpendicular to the radial direction), the regulating member 80 is firmly Can be fixed to.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, the regulating member 80 is not limited to stainless steel, but may be other nonmagnetic metals (copper, aluminum, brass, etc.).

  Further, although the regulating member 80 is fixed to the fixed iron core 40, it may be fixed to the movable iron core 50. For example, it can be fixed to the flat portion 52 of the movable iron core 50 by an appropriate method.

  Moreover, while the convex part 41 was formed in the fixed iron core 40 and the recessed part 51 was formed in the movable iron core 50, this invention is not limited to this. For example, the concave portion may be formed in the fixed iron core 40 and the convex portion may be formed in the movable iron core 50. Moreover, the fixed iron core 40 and the movable iron core 50 may not have a convex part and a concave part.

  Moreover, the fixing method with respect to the fixed iron core 40 of the limitation member 80 is not limited, It is possible to fix by an appropriate method.

  Further, although the regulating member 80 is formed by a rod-shaped member having a circular cross section, the present invention is not limited to this. For example, a rod-shaped member having a rectangular cross section may be formed to be bent into a substantially circular shape (C shape) in plan view as in the modification shown in FIG. With this configuration, when the regulating member 80 is fitted to the base 41a of the fixed iron core 40, a wide contact area between the inner circumferential surface of the regulating member 80 and the outer circumferential surface of the base 41a can be secured. it can. Thereby, the regulating member 80 can be more firmly fixed.

  In addition, an appropriate coating (for example, a resin-based coating) may be applied to the regulating member 80. Thereby, it is possible to suppress abnormal noise when the movable iron core 50 comes into contact with the regulating member 80. Further, the durability of the regulating member 80 can be improved.

DESCRIPTION OF SYMBOLS 1 Solenoid valve 30 Coil 40 Fixed iron core 41 Convex part 41a Base part 42 Plane part 50 Movable iron core 51 Concave part 52 Plane part 60 Valve body 80 Control member

Claims (5)

A fixed iron core,
A movable iron core slidable in a direction close to or away from the fixed iron core;
A valve body connected to the movable iron core and capable of opening and closing a fluid flow path;
A regulating member that is formed of a non-magnetic metal and regulates sliding of the movable iron core so that a gap between the movable iron core and the fixed iron core does not become less than a predetermined value;
A solenoid valve comprising: The regulating member is
The movable iron core is disposed between the movable iron core and the fixed iron core, and contacts the movable iron core and the fixed iron core when the movable iron core comes close to the fixed iron core. To regulate the sliding of the core,
The solenoid valve according to claim 1. Either the fixed iron core or the movable iron core is
Comprising a convex portion formed at the center of the surface facing the other of the fixed iron core or the movable iron core;
Either the fixed iron core or the movable iron core is
Formed in the center of the surface facing either the fixed iron core or the movable iron core, and comprising a recess capable of accommodating the convex portion when the movable iron core is close to the fixed iron core;
The restricting member is fixed to the base of the convex portion,
The solenoid valve according to claim 2. The regulating member is
The base of the convex part is fixed in a state fitted from the outer peripheral side,
The solenoid valve according to claim 3. The base of the convex part is
Having an outer peripheral surface formed perpendicular to the radial direction;
The solenoid valve according to claim 4.

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