JP2003172472A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the seating force of a valve element and to reduce the cost by reducing the number of components. <P>SOLUTION: This solenoid valve comprises: a first valve seat part 38 formed on a valve body 28 and communicated to first and second ports 22, 24; a guide member 42 mounted inside of the valve body 28; a second valve seat part 46 opened at an approximately central part of the guide member 42; a movable iron core 68 attracted to a fixed iron core 66 under exciting action of a solenoid part 32; a valve element 78 directly connected to the movable iron core 68; and an elastic part 80 mounted on the valve element 78, and seated on the first and second valve seat parts 38, 46 under the displacing action of the movable iron core 68. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve in which a movable iron core that is displaced under the excitation of a solenoid is directly connected to a valve body that opens and closes a fluid passage.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic valve has been used which controls the flow direction of compressed air by supplying a pressure fluid to an actuator or discharging compressed air into the atmosphere.

For example, Japanese Utility Model Laid-Open No. 60-178678 discloses a solenoid valve according to this type of prior art. As shown in FIG. 6, in the solenoid valve 1, the valve body 2
Intake valve body 5 for switching the communication between the first and second fluid ports 3 and 4 of each other, and the third fluid port 6 of the valve body 2.
A movable iron core 8 mounted with a seal member 7 that functions as an exhaust valve that switches the communication between the intake valve body 5 and the movable iron core 8 is provided inside the valve body 2. Two 9a and 9b are inserted.

In the OFF state where no current is supplied to the solenoid portion 11 arranged in the casing 10 above the valve body 2, the movable iron core 8 is displaced downward (in the direction of arrow B) by the first spring 12, The seal member 7 is seated on the first seat portion 13 to block the communication between the third fluid port 6 and the inside of the solenoid valve 1, and the valve element is pressed by the movable iron core 8 against the connecting rods 9a and 9b. 5 is the second spring 1
Since it is displaced downward against the spring force of No. 4, the second seat portion 1
The first fluid port 3 and the second fluid port 4 are separated from each other and are in communication with each other.

When a current is supplied to the solenoid portion 11, the movable iron core 8 is attracted to the fixed iron core 16 side under the action of excitation, and is moved upward (arrow A) against the spring force of the first spring 12.
Direction), the seal member 7 is moved to the first seat portion 13
The third fluid port 6 and the inside of the solenoid valve 1 are further separated from each other, and the valve body 5 pressed by the connecting rods 9a and 9b is moved to the second seat portion by the spring force of the second spring 14. 15 seated on the first fluid port 3 and the second
The communication with the fluid port 4 is cut off.

[0006]

By the way, in the solenoid valve 1 according to the prior art, the seal member 7 and the valve body 5 of the movable iron core 8 are the first and second springs 12, respectively.
By the spring force of 14, the first and second seat portions 13, 15
Each of them is seated and sealed. However, due to the respective spring force relationships between the first spring 12 and the second spring 14, a stable seat force cannot be obtained when the valve body 5 presses the first and second seat portions 13 and 15, and There is a problem that the response speed to the opening / closing operation of the valve body 5 is not stable.

The second seat portion 1 on which the valve body 5 is seated
In order to improve the seat force with respect to No. 5, it is necessary to increase the spring force of the second spring 14 and press it against the second seat portion 15. However, the second spring 1
When the spring force of 4 is increased, the upper surface of the valve body 5 and the movable iron core 8
The connecting rods 9a and 9b, which are inserted between the lower surface and the lower surface, are displaced upward through the valve body 5. Therefore, the seal member 7 is separated from the first seat portion 13 as the movable iron core 8 is semi-compulsively displaced upward by the pressing action of the connecting rods 9a and 9b, so that the third fluid port 6 and the electromagnetic Airtightness with the inside of the valve 1 cannot be maintained.

In this case, the problem can be solved by increasing the spring force of the first spring 12 similarly to the second spring 14, but the first and second springs 12, 1
There is another problem that it is difficult to adjust the balance of the mutual spring forces of No. 4 above. Further, when the spring force of the first spring 12 is increased, it becomes a resistance force when the movable iron core 8 is attracted upward under the exciting action thereof. Therefore, it is necessary to increase the attraction force of the solenoid valve 1. Therefore, there is a problem that the power consumption of the solenoid valve 1 increases and the overall configuration of the solenoid valve 1 increases in size.

The present invention has been made in consideration of the above-mentioned problems. By directly connecting the movable iron core and the valve body, the number of parts can be reduced and the seat force of the valve body can be improved. It is intended to provide a solenoid valve capable of

[0010]

In order to achieve the above-mentioned object, the present invention is a solenoid valve which displaces a valve body by attracting a movable iron core under the exciting action of a solenoid. By being directly connected to the movable iron core, the valve body is seated or separated from the valve seat portion formed on the valve body as the movable iron core is displaced,
It is characterized in that a fluid communication state and a fluid non-communication state between the plurality of ports formed in the valve body are switched to each other.

Further, the valve body is provided with a pair of arm portions extending in parallel at a predetermined distance, and the arm portions are engaged with the engaging grooves formed in the engaging grooves formed on the side surfaces of the movable iron core. It is good to form nails.

It is preferable that the valve body is provided with a connecting portion for connecting the ends of a pair of arm portions, and an elastic portion for seating on the valve seat portion is attached to the connecting portion.

According to the present invention, the valve body and the movable iron core are directly connected to each other, so that the valve seat portion is switched between the communication state and the non-communication state under the suction action of the movable iron core. Therefore, since the valve seat portion can be opened and closed directly under the suction action of the movable iron core, a stable seat force can always be obtained. Further, in the present invention, the solenoid valve according to the related art can be provided with two types of valves, one for intake and the other for exhaust, so that the number of parts can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a solenoid valve according to the present invention will be given and described in detail below with reference to the accompanying drawings.

1 to 4, reference numeral 20 indicates a solenoid valve according to an embodiment of the present invention.

The solenoid valve 20 is provided with a plurality of first to third ports 22, 24, 26 which are arranged in parallel at a predetermined distance.
A valve body 28 formed on the side surface, a bonnet 30 made of a thin metal plate integrally connected to the upper portion of the valve body 28, and a solenoid portion 32 disposed inside the bonnet 30. The solenoid mechanism 32 is provided with a valve mechanism 34 for switching the communication states of the first to third ports 22, 24, 26 under the excitation of the solenoid mechanism 32.

On the side surface of the valve body 28, a first port 22 to which a pressure fluid is supplied from a pressure fluid supply source (not shown) is formed in order from below, and is formed above the first port 22 with a predetermined space between them. Second port 24 from which is discharged
Further, a third port 26 is formed above the second port 24 at a predetermined distance from the second port 24 to open a fluid in a chamber 36 described later to the atmosphere.

A chamber 36, which communicates with the first to third ports 22, 24, 26, respectively, is formed in a substantially central portion of the valve body 28. A first valve seat portion 38 that projects long is formed. A passage 40, which communicates with the first port 22 through the inside of the valve body 28, is formed at substantially the center of the first valve seat portion 38.

A guide member 42 made of a resin material is integrally mounted on the step portion formed on the upper side of the chamber 36. A first seal member 44 is mounted in a groove portion on the outer peripheral surface of the guide member 42, and a second valve seat portion 46 protruding toward the first valve seat portion 38 by a predetermined length is provided at a substantially central portion. Are formed. The second valve seat portion 4
A first communication passage 48 extending from the tip end portion along the axial direction is formed at a substantially central portion of the first communication passage 6.
A second communication passage 50 (see FIGS. 2 and 4) that communicates with 8 and is substantially orthogonal to each other is formed inside the guide member 42.

The second communication passage 50 communicates with a recess 52 formed in the outer peripheral portion of the guide member 42. The recess 52 is formed by the first seal member 4 attached to the guide member 42.
The airtightness is maintained by 4 and a second seal member 72 described later.

As shown in FIGS. 2 and 4, a flange portion 54 is formed on the outer side of the guide member 42 so as to project toward the first valve seat portion 38 by a predetermined length.

Further, the first to third ports 22, 24, 2
As shown in FIGS. 1 and 3, a gasket 56 made of an elastic material is integrally attached to one end surface of the via an annular groove formed therein, and is connected to another fluid device (not shown). The airtightness of each port 22, 24, 26 at the time of doing is maintained.

A pair of lead wires 60a and 60b (see FIGS. 2 and 4) for supplying a current from a power source (not shown) to the solenoid portion 32 is connected to the upper surface of the bonnet 30.

The solenoid portion 32 is the bonnet 30.
A bobbin 64 having a coil 62 wound therein, a fixed iron core 66 having one end connected to the bonnet 30, and a spring member 82, which will be described later, disposed inside the bobbin 64. The movable iron core 68 is urged in a direction away from the fixed iron core 66 under the action. The fixed iron core 66 and the movable iron core 68 are formed to have a substantially rectangular cross section.

As shown in FIGS. 1 and 3, a ring body 70 made of a magnetic material such as a permanent magnet is provided so as to be sandwiched between the valve body 28 and the bobbin 64. The second seal member 7 is provided on the joint surface between the body 70 and the guide member 42 via the groove portion of the guide member 42.
2 is installed. The ring body 70 has a hole portion 74 through which the movable iron core 68 is inserted. In addition, between the outer peripheral surface of the movable iron core 68 and the hole 74 of the ring body 70,
Since the clearance that is separated by a predetermined distance is provided, the ring body 70 and the movable iron core 68 do not come into contact with each other, and the sliding resistance of the movable iron core 68 does not occur.

Between the bobbin 64 and the hood 30,
A third seal member 76 is mounted via a groove formed in the upper portion of the bobbin 64 to keep the bobbin 64 and the bonnet 30 airtight.

The valve mechanism portion 34 is directly connected to the movable iron core 68, and has a valve body 78 interlocking with the movable iron core 68, and an elastic portion 80 integrally attached to a substantially central portion of the valve body 78. ,
The single spring member 82 is interposed between the step portion of the second valve seat portion 46 of the guide member 42 and the valve body 78. The valve body 78 is formed in a substantially U-shaped cross section (see FIGS. 1 and 3), and the arm portion 83a of the valve body 78 is bifurcated.
A pair of engaging claws 84a, 84b that bulge inward for a predetermined length are formed at one end of 83b.
84b is an engagement groove 86 formed on the side surface of the movable iron core 68.
It is engaged with a and 86b. In addition, the engaging groove 86
The a and 86b are formed in shapes corresponding to the shapes of the engaging claws 84a and 84b, and as shown in FIG.
8 is displaced substantially horizontally in the direction of arrow C with respect to the valve body 78, so that the engaging claw portion 8 is inserted into the engaging grooves 86a and 86b.
4a and 84b are inserted, and the valve element 78 and the movable iron core 68 are surely directly connected. As a result, the valve body 78 is integrally displaced under the displacement action of the movable iron core 68.

Further, the elastic portion 80 provided at the substantially central portion of the connecting portion 87 for connecting the other ends of the arm portions 83a and 83b has the mounting hole 88 formed at the substantially central portion of the valve body 78. It is formed by integral molding in which a molten resin material is introduced and solidified. That is, the elastic portion 80 is
The molten resin material introduced into the mounting hole 88 is integrally mounted with the valve body 78 under the solidifying action, and the upper surface 81a and the lower surface 81b of the elastic portion 80 are exposed to the outside. As a result, as shown in FIG. 1, when the movable iron core 68 is seated on the first valve seat portion 38 under the displacement action,
Since it is pressed by the valve seat portion 38, the airtightness between the passage 40 and the chamber 36 is reliably maintained.

Further, the spring member 82 has the valve body 78 which is the first member.
The valve seat portion 38 is biased in a direction to be pressed.

The solenoid valve 20 according to the embodiment of the present invention is
It is basically constructed as described above. Next, its operation and action and effect will be explained.

FIG. 1 shows a lead wire 60 with respect to a coil 62.
a, 60b (see FIG. 2), the lower surface 81b of the elastic portion 80 of the valve body 78 is seated on the first valve seat portion 38 under the action of the spring force of the spring member 82. Then, the communication between the first port 22 and the second port 24 is cut off, and the off state is shown.

At this time, the second port 24 is defined between the upper surface 81a of the elastic portion 80 and the second valve seat portion 46 and the flange portion 54 of the guide member 42, as shown in FIG. Since the chamber 36 and the first communication passage 48 are in communication with each other through the gap defined by the second port 24 and the second communication passage 50.
And is in communication with the third port 26 via the recess 52. Therefore, the third port 2 communicated with the outside
The chamber 36 communicating with 6 is open to the atmosphere.

In such an off state, the coil 62 is excited by energizing the coil 62 by energizing a power source (not shown), and the movable iron core 6 is excited by the exciting action.
8 is the fixed iron core 66 side of the bonnet 30 (direction of arrow X1)
Is sucked into. As a result, as shown in FIGS. 2 and 4, the solenoid valve 20 is switched from the off state to the on state.

That is, the movable iron core 68 is displaced by a minute distance toward the fixed iron core 66 side (direction of arrow X1) against the spring force of the spring member 82, whereby the movable iron core 6 is moved.
The valve body 78 connected with 8 rises integrally. that time,
The upper end portion of the movable iron core 68 comes into contact with the end surface of the fixed iron core 66 to reach the displacement end position (see FIGS. 3 and 4).

Therefore, when the lower surface 81b of the elastic portion 80 of the valve body 78 is separated from the first valve seat portion 38 under the displacement action of the movable iron core 68, as shown in FIG. The 2 port 24 communicates with the passage 40 and the chamber 36 to be in the ON state. As a result, the first port 22
The pressure fluid supplied by the pressure fluid supply source (not shown) from the above passes through the gap between the elastic portion 80 and the first valve seat portion 38, and is supplied to the fluid device (not shown) via the chamber 36 and the second port 24. To be done.

Further, at this time, the upper surface 81a of the elastic portion 80 abuts against the tip of the second valve seat portion 46 and the tip of the flange portion 54 under the displacement action of the valve body 78, so that the first communication passage 48 is closed. The communication between the first communication passage 48 and the chamber 36 is cut off. In addition, since the suction force urged upward of the movable iron core 68 is integrally applied to the elastic portion 80 of the valve body 78, the upper surface 81a of the elastic portion 80 strongly adheres to the tip of the second valve seat portion 46. It is pressed, and the airtightness of the first communication passage 48 is more reliably maintained. That is, the communication between the second port 24 and the third port 26 can be more reliably sealed.

As described above, in the present embodiment, the engaging claws 84 of the valve body 78 are fitted in the engaging grooves 86a and 86b of the movable iron core 68.
The movable iron core 68 and the valve body 78 are directly connected by engaging a and 84b, and the connecting portion 8 of the valve body 78 is connected.
7 is provided with an elastic portion 80. As a result, the first and second valve seat portions 38, 46 can be alternately opened and closed by the upper surface 81a and the lower surface 81b of the elastic portion 80 of the connecting portion 87 under the displacement action of the movable iron core 68. It is not necessary to provide two opening / closing members like the seal member 7 of the valve body 5 and the movable iron core 8. As a result, the structure can be simplified and the number of parts can be reduced.

In the solenoid valve 1 according to the prior art,
In the solenoid valve 20 according to the present embodiment, the first and second springs 12 and 14 provided on both the movable iron core 8 side and the valve body 5 side may be a single spring member 82. Therefore, the complicated work of adjusting the spring forces of both springs 12 and 14 to adjust the seat forces of the valve body 5 and the seal member 7 becomes unnecessary.

Further, since the pressing force of the elastic portion 80 at the time of sitting on the second valve seat portion 46 is biased by the suction force of the movable iron core 68, the conventional springs 12 and 14 move to the seating portions 13 and 15. It is possible to further improve the seating force and obtain a stable seating force as compared with the pressing force of No. 2, and it is possible to reliably maintain the airtightness of the second valve seat portion 46.

Furthermore, by directly connecting the valve element 78 to the movable iron core 68, the valve element 78 is moved to the movable iron core 68.
Therefore, the responsiveness of the opening / closing operation of the valve body 78 to the displacement of the movable iron core 68 can be further improved.

[0041]

According to the present invention, the following effects can be obtained.

That is, the valve body and the movable iron core are directly connected to each other, and the valve seat portion is opened and closed by switching between the communicating state and the non-communicating state of the valve seat portion under the suction action of the movable iron core. be able to. As a result, it is possible to improve the seat force of the valve element and to obtain a stable seat force at all times.

Further, in the present invention, since two kinds of valve bodies provided in the solenoid valve according to the prior art can be made single, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention when the valve is closed.

FIG. 2 is a vertical sectional view taken along the line II-II of FIG.

FIG. 3 is a vertical sectional view of the solenoid valve according to the embodiment of the present invention when the valve is open.

4 is a vertical cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is an assembly explanatory diagram of the movable iron core and the valve body of the solenoid valve according to the embodiment of the present invention.

FIG. 6 is a vertical sectional view of a solenoid valve according to a conventional technique.

[Explanation of symbols]

20 ... Solenoid valve 22 ... 1st port 24 ... 2nd port 26 ... 3rd port 28 ... Valve body 30 ... Bonnet 32 ... Solenoid part 34 ... Valve mechanism part 36 ... Chamber 38 ... 1st valve seat part 40 ... Passage 42 ... Guide member 44 ... First seal member 46 ... Second valve seat portion 48 ... First communication passage 50 ... Second communication passage 52 ... Recess 54 ... Flange 56 ... Gasket 60a, 60b ...
Lead wire 62 ... Coil 64 ... Bobbin 66 ... Fixed iron core 68 ... Movable iron core 70 ... Ring body 72 ... Second seal member 74 ... Hole portion 76 ... Third seal member 78 ... Valve body 80 ... Elastic portion 81a ... Upper surface 81b ... Lower surface 82 ... Spring members 83a, 83b ...
Arm parts 84a, 84b ... Engaging claw parts 86a, 86b ...
Engaging groove 87 ... Connecting portion 88 ... Mounting hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Noriya Sasaki             4-2-2 Kinnodai, Taniwahara Village, Tsukuba-gun, Ibaraki Prefecture             SMC Corporation Tsukuba Technology Center F-term (reference) 3H106 DA08 DA23 DB02 DB12 DB23                       DB32 DC02 DC18 DD03 EE04                       EE40 GB06 KK04

Claims (3)

[Claims] 1. A solenoid valve for displacing a valve body by attracting a movable iron core under the excitation of a solenoid, wherein the valve body is directly connected to the movable iron core and the movable iron core is displaced. Accordingly, the valve body is seated on or separated from the valve seat portion formed on the valve body, so that the fluid communication state and the fluid non-communication state between the plurality of ports formed on the valve body can be switched to each other. Characteristic solenoid valve. 2. The solenoid valve according to claim 1, wherein the valve body is provided with a pair of arm portions that extend in parallel at a predetermined distance, and the arm portion has a side surface of the movable iron core. An electromagnetic valve characterized in that an engagement claw fitted to an engagement groove formed in the is formed. 3. The solenoid valve according to claim 2, wherein the valve body is provided with a connecting portion that connects end portions of a pair of arm portions, and the connecting portion is seated on the valve seat portion. A solenoid valve having an elastic part attached.