JPH09170675A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce impact noise which is generated when a movable iron core is attracted (at the time of valve opening). SOLUTION: A movable iron core 7 which is disposed facing a stationary iron core 5 in the inner circumference of a bobbin 3 is secured at a leaf spring 9 of its flange part 71 and is attracted to the stationary iron core 5 side when the coil is energized. A valve element 8 which is fixed at the leaf spring 9 with the movable iron core 7 is energized to a valve seat 12 side by a spring 18 disposed between a piece 6 positioned at the stationary iron core 5 and the leaf spring 9. While the coil is not energized, the valve element 8 receives energizing force of the spring 18 and touch the valve seat 12, thus shutting-down being generated between an inflow passage 10 and an outflow passage 11. The valve element 8 leaves the valve seat 12 and opens the inflow passage 10 as a result of the leaf spring 9 being deflected against the energizing force of the spring 18 when the coil is energized and the movable iron core 7 is attracted to the stationary iron core 5 side. At this time, the valve opening position of the valve element 8 is regulated by bringing the end surface 8b of the piece of the valve element 8 into contact with the stopper surface 6a of the piece 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve that drives a valve element by an electromagnetic force to open and close a fluid passage.

[0002]

2. Description of the Related Art As the prior art, the actual construction is 5-83557.
There is a solenoid valve disclosed in the publication. This solenoid valve is shown in FIG.
As shown in 6, when the coil 100 is energized, the fixed core 11
Movable iron core 120 sucked to the 0 side and this movable iron core 12
The valve body 14 which is displaced integrally with 0 to open and close the fluid passage 130
0, the movable core 120 and the valve element 140 are elastically connected by the flexible member 150. According to this structure, when the valve body 140 is displaced from the valve open state to the valve closed state, the flexible member 150 connecting the movable iron core 120 and the valve body 140 is bent, so that the valve body 140 is closed. The impact force at the time of collision with the seat 160 is absorbed, and the operating noise at the time of valve closing can be reduced.

[0003]

However, since the individual parts constituting the solenoid valve are manufactured by molding or cutting, the dimensional accuracy of the individual parts is secured, but the fixed iron core 110 is attached to the yoke 170 by the peel caulking. When this is done and when the yoke 170 is crimped to the magnetic plate 180, the dimension in the axial direction (left and right direction in FIG. 16) varies. That is, referring to FIG. 17, the end surface 110a of the fixed iron core 110 and the end surface 12 of the movable iron core 120 that face each other in the axial direction.
The distance (dimension L) from 0a varies. As a result, as the movable core 120 is attracted to the fixed core 110 side by energization of the coil 100 (that is, when the valve is opened), the smaller the dimension L between them becomes, the more the movable core resists the biasing force of the spring 190. Since the suction force for sucking 120 increases (see FIG. 9), the impact force when the stopper portion 200 provided integrally with the valve body 140 hits the end surface 210 a of the bobbin 210 also increases and a large impact sound is generated. was there. The present invention has been made based on the above circumstances, and an object thereof is to provide a solenoid valve that reduces the impact noise generated when the movable iron core is attracted (that is, when the valve is opened). .

[0004]

According to the first aspect of the present invention, when the coil is energized and the movable iron core is attracted toward the fixed iron core, the valve element supported by the support member together with the movable iron core is removed from the valve seat. The fluid passage is opened apart and abuts against the regulating member to regulate the valve opening position. Here, since the restricting member is positioned on the fixed iron core, the valve opening position of the valve body is always constant with respect to the fixed iron core. Further, since the position of the movable iron core when the movable iron core is sucked toward the fixed iron core is determined by the contact of the valve element with the regulating member, the position when the movable iron core is sucked with respect to the fixed iron core is also constant.

On the other hand, the position at which the movable iron core is separated from the fixed iron core when the coil is de-energized is determined by the position where the valve body abuts on the valve seat, and the valve body urges the biasing member through the support member. Since it is biased toward the valve seat by the biasing member, the biasing member absorbs the dimensional variation between the valve element (support member) and the restricting member or the fixed iron core. This allows the gap (air gap) between the fixed core and the movable core that face each other in the axial direction.
Can always be kept constant, so that the dimension between the movable core and the fixed core can be set large when the movable core is sucked toward the fixed core. As a result, since the impact force when the valve body hits the regulation member is reduced, the impact sound can be reduced.

According to the second aspect of the present invention, the movable iron core comprises a tubular member having one end opened, and one end of the tubular member has a protrusion extending radially inward toward the fixed iron core. Have As a result, a part of the magnetic flux flows between the movable iron core and the fixed iron core in the radial direction from the protrusion to the fixed iron core, so that the attraction force for attracting the movable iron core is reduced. As a result, the amount of bounce that bounces (bounds) to the valve seat side after the valve body comes into contact with the regulation member can be reduced, and therefore the flow rate reduction at the time of bounce can be reduced. Further, since the suction force is reduced and the impact force is reduced, the impact sound can be reduced.

According to the third aspect of the invention, since the end surface of the valve seat on which the valve element is seated is inclined, the inclined end surface of the valve seat gradually contacts the valve element when the valve element is seated on the valve seat. I will contact you. This can reduce the impact noise when the valve body is seated on the valve seat.

According to the means of claim 4, the support member is made of a thin plate-like elastic member, and the support member is provided with a notch hole to prevent the deformation of the support member when the movable core is attracted to the fixed core side. Can be easy. As a result, the impact sound when the movable iron core is sucked toward the fixed iron core and the valve body collides with the regulating member is mitigated by the elastic force of the support member, and thus the impact sound can be reduced. Further, since the impact force is alleviated, the bouncing of the valve element can be suppressed, so that it is possible to reduce the decrease in the flow rate at the time of bouncing and stabilize the flow rate performance.

According to the fifth aspect of the present invention, the valve body made of rubber is provided with a lip on the end surface (a surface facing the regulating member) so that when the valve body comes into contact with the regulating member, the lip is contacted. Since the contact area is reduced, the impact force can be alleviated, the impact noise can be reduced, and the decrease in the flow rate when the valve body bounces can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a solenoid valve of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is an overall sectional view of a solenoid valve, and FIG. 2 is an enlarged sectional view of an essential part around a piece. The solenoid valve 1 includes a cover 2 having a fluid passage (described later), a bobbin 3 combined with the cover 2, a coil 4 wound around the bobbin 3, and a fixed iron core 5 magnetized by a magnetic force generated by the coil 4. A piece 6 (regulating member of the present invention) positioned on the fixed iron core 5; a movable iron core 7 that is attracted to the fixed iron core 5 side when the coil 4 is energized; A valve body 8 for opening and closing the valve body, a movable iron core 7 and a leaf spring 9 for supporting the valve body 8 in a displaceable manner (support member of the present invention)
And so on.

The cover 2 has an inflow passage 10 and an outflow passage 11 forming a fluid passage, and a valve seat 12 on which a valve element 8 is seated.
Is provided. The valve seat 12 is provided so as to project cylindrically from the downstream end of the inflow passage 10 toward the valve body 8 side.
When the seating surface 8a (see FIG. 5) of the valve seat 12 abuts on the receiving surface (described below) of the valve seat 12, the inflow passage 10 is closed and the space between the inflow passage 10 and the outflow passage 11 is blocked, and the valve seat 12 When the seating surface 8a of the valve element 8 is separated from the receiving surface of the inflow passage 1
0 opens to connect the inflow passage 10 and the outflow passage 11 with each other. In some cases, the inflow passage 10 and the outflow passage 11 are reversed. As shown in FIG. 5 (a sectional view showing a state where the valve body 8 is lifted from the valve seat 12), a flat surface 12a substantially parallel to the seating surface 8a of the valve body 8 is provided on the receiving surface of the valve seat 12. An inclined surface 12b that is gently inclined rearward from the flat surface 12a (on the side opposite the valve body 8) is provided.

A magnetic plate 13 is insert-molded on the bobbin 3 during resin molding. The coil 4 is wound around the outer periphery of the bobbin 3, and then a terminal is connected to the terminal 14 and is energized from the outside through the terminal 14 to generate a magnetic force. The terminal 14 is insert-molded into a connector 16 that is resin-molded integrally with a housing portion 15 that covers the outer circumference of the coil 4.

The fixed iron core 5 is inserted into the inner circumference of the bobbin 3, and one end projecting from the end face of the bobbin 3 (the left end face in FIG. 1) is crimped, press-fitted, welded or the like to the end face of the yoke 17. It is fixed at 17. A projecting portion 50 (see FIG. 2) is provided at the center of the other end of the fixed iron core 5, and a circular hole 5 having a circular cross section is provided at the center of the projecting portion 50.
1 is formed from the end face to a predetermined depth. York 1
7 is attached to the magnetic plate 13 that covers the outer periphery of the housing portion 15 and projects from the bobbin 3, and then the tip portion of the cover 7 is fixed to the cover 2 that is attached to the bobbin 3 by caulking.

The piece 6 is made of a non-magnetic material (for example, non-magnetic metal such as stainless steel or copper, or a resin molding material) and has a substantially columnar shape, and a shaft portion 60 provided at the center of one end face.
Is inserted or press-fitted into the round hole 51 of the fixed iron core 5, and the stepped surface 61 that expands in the radial direction from the shaft portion 60 is positioned and fixed to the fixed iron core 5 in a state of being in contact with the end surface 50a of the protruding portion 50 of the fixed iron core 5. (See FIG. 2). A flange portion 62 is provided on the peripheral wall surface of the piece 6, and on the other side of the flange portion 62, the peripheral wall surface is provided with a slight taper toward the tip. In addition, the flange portion 62
The one side is provided in a cylindrical shape having substantially the same diameter as the protruding portion 50 of the fixed iron core 5, and the peripheral wall surface is the outer peripheral surface 50 of the protruding portion 50.
It forms almost the same surface as b. Note that the taper shape of the piece 6 is an example, and has a shape that can be used as a guide shape of the spring 18 described later.

The movable iron core 7 is arranged in the inner periphery of the bobbin 3 on the magnetic plate 13 side so as to face the fixed iron core 5, and is formed in a substantially cylindrical shape so as to be in sliding contact with the inner peripheral surface of the bobbin 3. The movable iron core 7 is bent at one end inward in the radial direction and forms an air gap G (see FIG. 2) between the movable iron core 7 and the end surface 5a of the fixed iron core 5 (projection portion of the present invention). Is provided, and a flange portion 71 that expands outward in the radial direction is provided at the other end portion.
Is fixed to the leaf spring 9 by welding on the outside of the bobbin 3.

The leaf spring 9 is, as shown in FIG.
And a substantially circular support surface 90 that supports the valve body 8, a plurality of (for example, three) support arms 91 provided on the outer periphery of the support surface 90, and an annular portion that connects the end portions of each support arm 91. A ring portion 19 (see FIG. 2) made of rubber 92 and fixed to the annular portion 92 is sandwiched between the end surface of the bobbin 3 and the end surface of the cover 2. This leaf spring 9 can be bent to the left and right sides in FIG. 2 as the movable iron core 7 is displaced.

The valve body 8 is made of an elastic body (made of rubber, for example) and is fixed to a position facing the piece 6 on the inner peripheral side of the flange portion 71 of the movable iron core 7 with respect to the leaf spring 9, and the The spring 18 (biasing member of the present invention) arranged between the flange portion 62 and the leaf spring 9 biases the valve seat 12 side. However, as shown in FIG. 5, the spring 18 has an outer diameter D1 that is the outer diameter D2 of the flat surface 12a of the valve seat 12.
A diameter larger than (diameter of a circle drawn by the ridgeline of the flat surface 12a and the inclined surface 12b) is used. This valve body 8
When the coil 4 is energized and the movable iron core 7 is attracted to the fixed iron core 5 side, the leaf spring 9 bends against the urging force of the spring 18, so that the piece-side end surface 8b of the valve body 8 is changed to the piece 6
Abutting on the end surface 6a (hereinafter referred to as the stopper surface 6a) of
When the coil 4 is not energized, the seating surface 8a of the valve body 8 is in contact with the receiving surface of the valve seat 12 by the biasing force of the spring 18.

In the leaf spring 9 described above, when the valve body 8 is in contact with the receiving surface of the valve seat 12 when the coil 4 is not energized, the supporting surface 90 for supporting the movable iron core 7 and the valve body 8 has the supporting arm 91.
When the coil 4 is energized and the movable iron core 7 is attracted to the fixed iron core 5 side by slightly bending toward the valve seat 12 side (the state shown in FIG. 2), the supporting surface 90 moves from the supporting arm 91 to the piece 6
It will be bent to the side (see FIGS. 3 and 4).

Next, the operation of this embodiment will be described. First,
When the coil 4 is not energized, the seating surface 8a of the valve body 8 is in contact with the receiving surface (the flat surface 12a and the inclined surface 12b) of the valve seat 12 by the urging force of the spring 18, as shown in FIG. Therefore, the inflow passage 10 and the outflow passage 11 are shut off from each other, and no fluid flows in the fluid passage. After that, when the coil 4 is energized and the fixed iron core 5 is magnetized by the magnetic force generated by the coil 4, the movable iron core 7 is attracted to the fixed iron core 5 side against the biasing force of the spring 18. As a result, the leaf spring 9 bends as the movable iron core 7 moves, and the valve element 8 fixed to the leaf spring 9 separates from the valve seat 12 to open the inflow passage 10, and the piece-side end surface 8b is The piece 6 is lifted to a position where it comes into contact with the stopper surface 6a. The behavior of the movable iron core 7, the valve body 8, and the leaf spring 9 at this time is shown in FIG. 3 (immediately before the piece-side end surface 8b of the valve body 8 contacts the stopper surface 6a of the piece 6) and FIG. It is shown immediately after the side end surface 8b comes into contact with the stopper surface 6a of the piece 6. As a result, the inflow passage 10 and the outflow passage 11 communicate with each other, so that the inflow port 10 of the inflow passage 10 is connected.
A fluid flow is generated from a toward the outflow port 11a of the outflow passage 11.

On the other hand, when the power supply to the coil 4 is stopped,
Since the magnetic force of the coil 4 disappears and the force for attracting the movable iron core 7 disappears, the movable iron core 7 that has been attracted to the fixed iron core 5 side is pushed back by the urging force of the spring 18. With the movement of the movable iron core 7, the valve body 8 moves toward the valve seat 12 side and seats on the valve seat 12, thereby closing the fluid passage. At this time, the valve body 8 moving to the valve seat 12 side first comes into contact with the seating surface 8a of the valve body 8 against the flat surface 12a of the valve seat 12 (see FIG. 6), and further the valve body 8 bends together with the leaf spring 9. The seating surface 8a of the portion urged by the spring 18
Gradually contacts the inclined surface 12b of the valve seat 12 and stops (see FIG. 7). That is, the flat surface 12a of the valve seat 12 is in contact with the seating surface 8a of the valve body 8 in a state of biting.

(Effect of the First Embodiment) According to the structure of the present embodiment, the piece 6 positioned on the fixed iron core 5 when the coil 4 is not energized (thus the piece 6 is also considered as a part of the fixed iron core 5). However, since the valve element 8 is in contact with the valve seat 12 by the spring 18 disposed between the leaf spring 9 and the leaf spring 9, the dimensional variation between the piece 6 or the fixed iron core 5 and the leaf spring 9 is prevented. It can be absorbed by the spring 18. That is, the distance between the end surface 5a of the fixed iron core 5 and the end surface 70a of the facing wall portion 70 of the movable iron core 7 when the coil 4 is not energized can be kept constant. Further, since the valve opening position of the valve body 8 is regulated by the piece 6, the gap between the end surface 70a of the facing wall portion 70 and the end surface 5a of the fixed iron core 5 which face each other when the movable iron core 7 is sucked toward the fixed iron core 5 side. Can always be kept constant.

Thus, the dimensional variation between the end surface 5a of the fixed iron core 5 and the end surface 70a of the facing wall portion 70 of the movable iron core 7 is prevented and the air gap G between them is always kept constant, which is smaller than the conventional one. it can. As a result, as shown in FIG. 9, since the attraction force for attracting the movable iron core 7 against the biasing force of the spring 18 can be reduced, the piece-side end surface 8b of the valve body 8 contacts the stopper surface 6a of the piece 6. The energy of time is reduced, and the impact sound generated by the collision can be reduced. In the present embodiment, the valve body 8 is made of an elastic body, and the supporting member for supporting the movable iron core 7 and the valve body 8 is the leaf spring 9, so that the impact force when the valve body 8 collides with the piece 6 is increased. Since it is absorbed by the elastic force of the body 8 itself and the elastic force of the leaf spring 9, as shown in FIG. 10, the operating noise generated when the valve is opened can be reduced as compared with the conventional solenoid valve.

Further, when the coil 4 is de-energized, the movable iron core 7 which has been attracted to the fixed iron core 5 side is pushed back by the urging force of the spring 18 so that the valve body 8 is closed.
When moving to the 2 side, first, after the seating surface 8a of the valve body 8 abuts on the flat surface 12a of the valve seat 12, the valve body 8 bends together with the leaf spring 9 and is urged by the spring 18. The seating surface 8a of the seated portion can contact the inclined surface 12b of the valve seat 12. In this case, since the seating surface 8a of the valve body 8 contacts the flat surface 12a and then gradually contacts the inclined surface 12b, the impact force when the valve body 8 contacts the valve seat 12 is absorbed. To be done. As a result, as shown in FIG. 11, the operating noise generated when the valve is closed can be reduced as compared with the conventional solenoid valve.

Further, when the coil 4 is not energized, the inner peripheral end surface 70b of the facing wall portion 70 of the movable iron core 7 is opposed to the peripheral wall surface of the piece 6, whereas the coil 4 is energized and the movable iron core 7 is moved. As is sucked toward the fixed core 5 side, the inner peripheral end surface 70b of the facing wall portion 70 changes its facing position from the peripheral wall surface of the piece 6 to the outer peripheral surface 50b of the protruding portion 50 of the fixed iron core 5, and immediately after energization. It is configured to face the outer peripheral surface 50b of the protruding portion 50 (see FIG. 4). As a result, a part of the magnetic flux flows between the movable iron core 7 and the fixed iron core 5 in the radial direction from the inner peripheral end surface 70b of the facing wall portion 70 to the protruding portion 50.
The suction force for sucking the movable iron core 7 is reduced. As a result, after the valve body 8 contacts the piece 6, it bounces (valve seat 12
Since the amount of bounce (toward the side) can be reduced, the decrease in flow rate at bounce can be reduced. Further, since the suction force is reduced and the impact force is reduced, the impact sound can be reduced.

(Second Embodiment) FIG. 12 is an enlarged cross-sectional view of an essential portion around the piece 6, and FIGS. 13 and 14 are plan views of the leaf spring 9. In this embodiment, in order to facilitate the deformation of the leaf spring 9 when the valve body 8 is actuated, a cutout hole 93 as shown in FIGS. 13 and 14 is provided in the central portion of the leaf spring 9. The amount of deformation can be easily set by changing the plate thickness and shape of No. 9. Further, as shown in FIG. 12, an annular lip 80 is provided so as to project on the facing surface of the valve body 8 that faces the stopper surface 6a of the piece 6, and the tip of the lip 80 becomes the stopper surface 6a of the piece 6 when the valve is opened. It is configured to abut. As a result of these, as shown in FIG. 15, since the spring characteristic along the suction force curve is obtained, the impact force when the valve body 8 collides with the piece 6 is reduced, and the bounce of the valve body 8 is suppressed. Therefore, the flow rate performance can be stabilized.

(Modification) In this embodiment, the piece 6 is positioned by bringing the step surface 61 of the piece 6 into contact with the end surface 50a of the protruding portion 50 of the fixed iron core 5. However, other methods (for example, The piece 6 is attached to the bottom of the round hole 51 of the fixed core 5.
The piece 6 may be positioned with respect to the fixed iron core 5 by contacting the tip end surface of the shaft portion 60). Although the spring 18 for urging the valve body 8 toward the valve seat 12 is arranged between the piece 6 and the leaf spring 9, it may be arranged between the fixed iron core 5 and the leaf spring 9. Alternatively, a locking wall that locks the spring 18 may be provided on the inner peripheral side of the flange portion 71 of the movable iron core 7 so as to be arranged between the piece 6 and the movable iron core 7. As a method of fixing the movable iron core 7 to the leaf spring 9,
Other than welding, a method of crimping and fixing with a rivet, a method of fixing with an adhesive, or the like can be adopted.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a solenoid valve.

FIG. 2 is an enlarged cross-sectional view of a main part around a piece (when the valve is closed).

FIG. 3 is an enlarged cross-sectional view of a main part around a piece (immediately before full opening).

FIG. 4 is an enlarged cross-sectional view of a main part around a piece (immediately after ON).

FIG. 5 is a cross-sectional view showing a state where the valve body is lifted from the valve seat.

FIG. 6 is a cross-sectional view showing a process in which the valve body is seated on the valve seat.

FIG. 7 is a cross-sectional view showing a state in which a valve element is seated on a valve seat.

FIG. 8 is a plan view of a leaf spring (first embodiment).

FIG. 9 is a graph showing the relationship between air gap and suction force.

FIG. 10 is a graph showing an operating sound when the valve body hits the piece.

FIG. 11 is a graph showing an operating sound when a valve body hits a valve seat.

FIG. 12 is an enlarged cross-sectional view of a main part around a piece (second embodiment).

FIG. 13 is a plan view of a leaf spring (second embodiment).

FIG. 14 is a plan view of a leaf spring (second embodiment).

FIG. 15 is a graph showing the relationship between suction force and spring characteristics (second embodiment).

FIG. 16 is an overall sectional view of a solenoid valve (prior art).

FIG. 17 is an enlarged cross-sectional view of a main part around a piece (prior art).

[Explanation of symbols]

 1 Solenoid Valve 4 Coil 5 Fixed Iron Core 6 Piece (Regulating Member) 7 Movable Iron Core 8 Valve Body 9 Leaf Spring (Supporting Member) 10 Inflow Passage (Fluid Passage) 11 Outflow Passage (Fluid Passage) 12 Valve Seat 18 Spring (Biasing Member) ) 70 Opposing wall part (projection part) of movable iron core 80 Lip 93 Notch hole G Air gap

Claims (5)

[Claims] 1. A coil that generates a magnetic force when energized, a fixed iron core magnetized by the magnetic force generated by the coil, a regulating member that is positioned and fixed to the fixed iron core, and the regulating member and the fluid passage are provided. A valve body which is interposed between the valve seat and the valve seat to close the fluid passage by contacting the valve seat, and which opens the fluid passage when separated from the valve seat; And a flexible support member that is displaceably supported between the valve seat and the valve seat, and biases the support member in a direction in which the valve element abuts the valve seat with respect to the restriction member or the fixed iron core. An urging member is supported by the supporting member and faces the fixed iron core to form an air gap, and when the coil is energized, the valve body resists the urging force of the urging member. Fixed core side to the position where it abuts the member Solenoid valve having a movable iron core is attracted. 2. The movable iron core comprises a tubular member having an opening at one end, and when the movable iron core is attracted toward the fixed iron core by the magnetic force of the coil, a part of the fixed iron core is included in the tubular member. The solenoid valve according to claim 1, wherein one end of the tubular member has a protrusion that extends inward in the radial direction toward the fixed core. 3. The solenoid valve according to claim 1, wherein an end surface of the valve seat on which the valve element is seated is inclined. 4. The support member is formed of a thin plate-shaped elastic member, and is provided with a notch hole that promotes deformation of the support member when the movable core is sucked toward the fixed core. The solenoid valve according to any one of claims 1 to 3, which is characterized. 5. The valve body is made of rubber, is integrally molded with the support member, and has an annular lip projectingly provided on a surface facing the regulating member, and a tip end of the lip is the regulating member when the valve is opened. The solenoid valve according to any one of claims 1 to 4, which abuts against.