JPH06700Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a solenoid valve, and more particularly to a technique effective when applied to a 2-port pilot type solenoid valve.

[Conventional technology]

Conventionally, spool valves and poppet valves have been used as valves used for switching the flow of fluid and for opening and closing the flow. For example, as described in "Pneumatic and pneumatic handbook" edited by Japan Hydro-Pneumatic Association, published by Ohmsha Co., Ltd. on April 20, 1975, the spool valve slides the spool axially in a cylindrical valve hole. This is a type of valve in which the flow path is switched by moving it. On the other hand, a poppet valve is a type of valve in which a valve body and a valve seat are provided coaxially with the direction of fluid flow.

In the spool valve, the O-ring provided for sealing the spool and the valve hole is in sliding contact with the inner surface of the valve hole, so the durability of the O-ring is limited. On the other hand, since the poppet valve opens and closes the valve body against the flow of fluid, it is necessary to apply a large load to the opening and closing when the fluid pressure is high.

Even when the fluid with high pressure is guided or the diameter of the flow passage is increased to allow a large amount of fluid to flow, the pilot pressure must be increased in order to operate the open / close valve with a small load to open / close the flow passage. There is a solenoid valve used. An example of this type of solenoid valve is shown in Japanese Utility Model Laid-Open No. 58-167369.

[Problems to be solved by the device]

The present inventor utilizes pilot pressure as a solenoid valve for opening and closing a channel for guiding a fluid having a high pressure or a channel having a large diameter for guiding a large amount of fluid. The thing shown in FIG. 9 was examined.

As shown in the figure, the valve housing 1 is provided with an annular valve seat 7 for partitioning the input port 5a and the output port 5b, and a diaphragm 4 in pressure contact with the valve seat 7 provides both ports 5a, 5b.
b is connected and disconnected. A pilot chamber 6 is formed in the valve housing 1 so as to be located on the opposite side of the diaphragm 4.

In order to supply the fluid in the input port 5a to the pilot chamber 6, a bypass hole 14 is formed in the diaphragm 4, and a valve hole 13a that connects the pilot chamber 6 and the output port 5b is formed in the diaphragm 4. .

A pilot valve 3 for opening and closing the valve hole 13a from the pilot chamber 6 side is provided in the valve housing 1. In this pilot chamber 3, a diaphragm 4 is brought into pressure contact with a valve seat 7 and the valve hole 13
An elastic force in the direction of closing a is biased by the spring 10. The pilot valve 3 moves away from the diaphragm 4 by the solenoid coil 2c against the biasing force.

In such a solenoid valve, as shown in FIG. 9 (a), when the diaphragm 4 is pressed against the valve seat 7 by the elastic force of the spring 10, the input port 5a and the output port 5 are
b is in the state of not communicating, and the fluid of the input port 5a flows into the pilot chamber 6. Therefore,
The pressure of the fluid in the pilot chamber 6 applies a load to the diaphragm 4 in the direction toward the valve seat 7.

In this state, as shown in FIG. 9 (b), when the solenoid coil 2c is energized, first, the pilot valve 3 separates from the diaphragm 4, so that the fluid in the pilot chamber 6 passes through the valve hole 13a and the output port 5b. Flows in. As a result, the pressure in the pilot chamber 6 decreases, so that the diaphragm 4 separates from the annular valve seat 7 and the fluid in the input port 5a flows into the output port 5b. At this time, if the diameter of the bypass hole 14 is made smaller, it becomes more difficult for the fluid to flow into the pilot chamber 6 from the input port 5a, and a differential pressure is likely to occur in the pilot chamber 6, so that the response of the diaphragm is improved. .

However, on the other hand, when the energization of the solenoid coil 2c is stopped and the state of FIG.
By closing a, the diaphragm 4 is brought into pressure contact with the valve chamber 7 by the pressure in the pilot chamber 6, but the bypass hole 14
If the diameter is small, it takes time for the pressure in the pilot chamber 6 to become the same as the pressure in the input port 5a, and the responsiveness of the diaphragm 4 is delayed.

On the contrary, if the diameter of the bypass hole 14 is increased, the responsiveness when the diaphragm 4 is pressed against the valve chamber 7 and the ports 5a and 5b are closed can be improved. The response when opening the ports 5a and 5b apart from each other is delayed because a differential pressure is less likely to occur.

An object of the present invention is to provide a solenoid valve capable of improving responsiveness when opening and closing an input port and an output port with a diaphragm.

[Problems to be solved by the device]

The following is a brief description of the outline of the typical invention disclosed in the present application.

That is, in the solenoid valve of the present invention, the valve housing having the input port and the output port is formed with the valve seat defining the communication side opening of these ports, and the pilot chamber formed in the valve housing is formed. A bypass hole that connects the input port and the pilot chamber is formed in the diaphragm that separates the input port and the opening side. A valve hole formed in the diaphragm and connecting the pilot chamber and the output port is opened and closed by a pilot valve driven by a solenoid. There is an opening / closing means for reducing the communication opening degree of the bypass hole to the input port when the diaphragm is in pressure contact with the valve seat, and for increasing the communication opening degree of the bypass hole when the diaphragm is away from the valve seat.

[Action]

When the fluid supplied to the input port flows out to the output port, the pilot valve is separated from the diaphragm.
As a result, the fluid in the pilot chamber flows out to the output port through the valve hole, and the pressure in the pilot chamber drops,
The opening / closing means regulates the flow rate of the fluid flowing from the input port into the pilot chamber through the bypass hole, and a differential pressure is easily generated between the input port and the pilot chamber, and the diaphragm quickly separates from the valve seat. .

On the other hand, when stopping the flow of fluid to the output port,
The valve hole of the diaphragm is closed by the pilot valve. As a result, the fluid flowing from the input port into the pilot chamber through the bypass hole does not flow out from the output port, but the flow rate through the bypass hole is increased by the opening / closing means, so that the input port side and the pilot chamber have the same pressure. As a result, the diaphragm is quickly pressed against the valve seat.

[Embodiment 1] FIG. 1 is a sectional view showing a solenoid valve according to an embodiment of the present invention.
2 is an enlarged sectional view showing a part of the solenoid valve of FIG. 1, FIG.
The drawing is an enlarged plan view showing an opening / closing member used in the solenoid valve of FIG.

The solenoid valve shown is a protective cap 2a of the solenoid section 2.
Has a valve housing 1b formed integrally with the valve housing 1b and a valve housing member 1a integral with the valve housing 1b. The valve housing 1 has an input port 5a that is open to the outside on both side surfaces thereof. And an output port 5b are formed.

The communication port side opening 6a of the input port 5a and the output port 5b
As shown in the drawing, the communication-side openings 7a of the two open in the same plane and are adjacent to each other via the annular valve seat 7.

A disk-shaped diaphragm body 12 made of an elastic material is provided in the valve housing 1, and a disk-shaped valve body 11 made of a hard material is fixed to the diaphragm body 12 to form a diaphragm 4. . By pressing one side of the diaphragm 4 against the annular valve seat 7, both ports 5a, 5b
The communication is being broken.

A pilot chamber 6 is formed in the valve housing 1 so as to be located on the other side of the diaphragm 4, and a bypass hole 14 for communicating the pilot chamber 6 with the input port 5a is formed.
Is formed on the diaphragm 4.

Valve hole 1 that connects the pilot chamber 6 and the output port 5b
3a is formed on the diaphragm 4, and the valve hole 13
A pilot valve 3 for opening and closing a from the pilot chamber 6 side is arranged in the solenoid portion 2. This pilot valve 3
Has a plunger, that is, a movable member 8 provided at the tip with a valve body 9 made of an elastic material that abuts a valve seat 13 formed on the diaphragm 4, and the plunger 8 has a fixed core 2
It is accommodated in a recess 2d formed in b so as to be slidable in the axial direction.

The pilot valve 3 is biased by a spring 10 with an elastic force, that is, a spring force, in a direction in which the valve body 9 at the tip of the pilot valve 3 is brought into pressure contact with the diaphragm 4. When the solenoid coil 2c is energized, the pilot valve 3 separates from the diaphragm 4 against the biasing force of the spring 10. When the pilot valve 3 separates from the diaphragm 4, the stopper portion 11a provided on the outer peripheral portion of the valve body 11 contacts the solenoid portion 2,
The open end position of the diaphragm 4 is restricted.

As shown in FIG. 2, a set screw 15 is attached to the valve housing 1.
The opening / closing member 16 is attached by. In this opening / closing member 16, the diaphragm 4 is brought into pressure contact with the valve seat 7 so that both ports 5
When the a and 5b are closed, the diaphragm 4 contacts the diaphragm body 12 of the diaphragm 4, and in this state, in order to set the opening diameter of the bypass hole 14 to be small, the communication hole 16a having a smaller diameter than the bypass hole 14 is formed. Is formed on the opening / closing member 16.

The opening / closing member 16 is separated from the diaphragm 4 when the diaphragm 4 is separated from the valve seat 7, and the bypass hole 14 is directly opened to the input port 5a to increase the communication opening degree.

Therefore, when the pilot valve 3 is separated from the diaphragm 4 and the ports 5a and 5b are communicated with each other, the communication port 16a having a small diameter is provided from the input port 5a into the pilot chamber 6.
, The flow rate of the inflowing fluid is regulated. On the other hand, when the diaphragm 4 is pressed against the valve seat 7, the opening / closing member 16 is separated from the diaphragm 4, and the bypass hole 14 having a larger communication diameter than the communication hole 16a.
A large amount of fluid flows into the pilot chamber 6 from the input port 5a via the.

Next, the operation of the embodiment will be described.

First, the state shown in FIG. 1 shows when the solenoid portion 2 is demagnetized, and the pilot valve 3 is driven by the urging force of the spring 10.
Closes the valve hole 13a, and the diaphragm 4 is in pressure contact with the valve seat 7. Therefore, both ports 5a, 5b are in a mutually closed state, and the pilot chamber 6 is made to have the same pressure as the pressure of the input port 5a via the bypass hole 14.

Next, when the solenoid portion 2 is excited from this state,
The pilot valve 3 separates from the diaphragm 4 against the biasing force of the spring 10, and the valve hole 13a is opened. This allows
Fluid such as compressed air in the pilot chamber 6 flows out to the output port 5b through the valve hole 13a, and the pressure in the pilot chamber 6 drops.

The diaphragm 4 separates from the valve seat 7 due to the pressure difference between the input port 5a side and the pilot chamber 6 side, and moves until the stopper portion 11a comes into contact with the fixed iron core 2b, so that the input port 5a and the output port 5b communicate with each other. It becomes a state.

The fluid such as compressed air supplied to the input port 5a is
A large amount is discharged to the output port 5b side through the communication side openings 6a and 7a in the communication state. Further, the opening / closing member 16
By separating from the diaphragm 4, the pilot chamber 6 and the input port 5a are communicated with each other through the opened bypass hole 14, that is, the portion having the larger communication diameter.

As described above, when the diaphragm 4 is in pressure contact with the valve seat 7, the communication opening of the bypass hole 14 to the input port 5a is small. Therefore, when the valve hole 13a is opened from this state, the pilot chamber is opened through this valve hole 13a. Although the fluid in 6 flows out into the output port 5b, the inflow of fluid into the pilot chamber 6 from the bypass hole 14 having a small communication opening is regulated, so that the difference between the input port 5a and the pilot chamber 6 is reduced. Pressure tends to occur. Therefore, the responsiveness of the diaphragm 4 when connecting the ports 5a and 5b to each other can be accelerated.

Next, when the solenoid portion 2 is demagnetized, first the spring 10
The pilot valve 3 comes into contact with the diaphragm 4 by the urging force to close the valve hole 13a. At this time, since the diaphragm 4 is separated from the valve seat 7 and the communication opening degree of the bypass hole 14 is large, the fluid quickly flows into the pilot chamber 6 from the input port 5a, and they are quickly pressurized to the same pressure. Becomes The pressure in the pilot chamber 6 causes the diaphragm 4 to quickly move along with the urging force of the spring 10.
Is pressed against.

As described above, the responsiveness of the diaphragm 4 can be improved both when the diaphragm 4 is pressed against the valve seat 7 and when it is separated from the valve seat 7, and the operational reliability of this type of solenoid valve is improved. Can be planned.

[Embodiment 2] FIG. 4 is a partially enlarged sectional view showing a solenoid valve according to another embodiment of the present invention.

In the solenoid valve of this embodiment, the opening / closing member 16 is provided with a truncated cone-shaped projecting portion 17 having an outer diameter smaller than the inner diameter of the bypass hole 14, and the projecting portion 17 has a small diameter at its center. Communication hole 16a is formed so as to penetrate therethrough. The other structure is the same as that of the above-mentioned embodiment.

[Embodiment 3] FIG. 5 is a partially enlarged sectional view showing a solenoid valve which is another embodiment of the present invention.

In the solenoid valve of this embodiment, the opening / closing member 18 does not have the communication hole 16a as in the above-described embodiment,
A gap 19 having a dimension h is formed between the opening / closing member 18 and the diaphragm 4. Due to this clearance 19, the communication opening degree of the bypass hole 14 to the input port 5a becomes small when the diaphragm 4 is in pressure contact with the valve seat 7, and the communication opening degree becomes large when the diaphragm 4 is away from the valve seat 7. Become. The other structure is almost the same as that of the first embodiment.

[Embodiment 4] FIG. 6 is a sectional view showing a solenoid valve according to another embodiment of the present invention, and FIGS. 7 (a) and 7 (b) show the opened / closed state of the diaphragm of the solenoid valve shown in FIG. It is a partially expanded sectional view.

In the solenoid valve of this embodiment, the pilot valve 3 is made of an elastic material which is arranged in a non-fixed state in a disk-shaped movable member 8 made of a magnetic material and a stepped hole 21 formed in the movable member 8. The valve body 9 and the movable member 8 are formed by a support member 20 made of an elastic material and fixed to the outer peripheral portion of the lower surface.

The support member 20 of the pilot valve 3 is sandwiched between the valve housing members 1b and 1c, and the pilot valve 3 is positioned inside the pilot chamber 6 and fixed to the valve housing 1.
The valve body 9 is biased by the spring 10 in the direction to close the valve hole 13a, and the locking step portion 2 formed in the hole 21.
1a is locked by a locking step 9a formed on the valve body 9.

The movable member 8 is fixed to the fixed iron core 2 by the excitation of the solenoid portion 2.
When sucked by the lower suction surface of b, the valve body 9 is moved by the movable member 8 toward the fixed iron core 2b, and the valve body 9 made of an elastic material is brought into contact with the lower suction surface of the fixed iron core 2b. As a result, the impact at the time of contact is buffered.

On the other hand, when the solenoid portion 2 is demagnetized, the valve body 9 moves toward the diaphragm 4 by the biasing force of the spring 10.

On the outer peripheral portion of the movable member 8, for example, four through holes 22 are provided at equal intervals along the circumferential direction of the movable member 8. A cylindrical stopper 24 protruding from the lower side of the solenoid portion 2 is arranged in each through hole 22, and the diaphragm 4 is brought into contact with the tip end surface of the stopper 24.

Of the plurality of stoppers 24, a push rod 24a projects into the bypass hole 14 at the tip of the stopper 24 corresponding to the bypass hole 14.

On the other hand, the diaphragm 4 is provided with an opening / closing member 25 located on the input port 5a side. This opening / closing member 25
Is a plate 25 that is elastically deformed, as shown in FIGS. 7 (a) and 7 (b).
A hard plate 25b made of metal or the like is attached to a and formed. The opening / closing member 25 is formed with a communication hole 16 a facing the bypass hole 14 and having a diameter smaller than that of the bypass hole 14.

Therefore, when the diaphragm 4 is in pressure contact with the valve seat 7 and both ports 5a and 5b are closed, when the pilot valve 3 moves backward by energizing the solenoid portion 2, the valve hole 13a is opened and the pilot hole is opened. The fluid in the chamber 6 will flow out to the output port 5b, but at this time, the fluid in the input port 5a will flow into the pilot chamber 6 through the communication hole 16a, so that the input port 5a and the pilot chamber 6 A differential pressure is generated between them, and the diaphragm 4 is opened with good responsiveness.

On the other hand, as shown in FIG. 7 (b), when the diaphragm 4 is open, the opening / closing member 25 opens the bypass hole 14 by the push rod 24a. When the energization is released, first, the pilot valve 3 closes the valve hole 13a. And
At this time, the bypass hole 14 with a large opening
Since the fluid in the input port 5a flows into the pilot chamber 6 through the same, the pilot chamber 6 quickly has the same pressure as the input port 5a, and the diaphragm 4 moves in pressure contact with the valve seat 7 with good responsiveness.

In this way, similarly to the above-described embodiment, the responsiveness of the diaphragm 4 can be speeded up both when the diaphragm 4 is opened and when it is closed.

[Embodiment 5] FIGS. 8 (a) and 8 (b) are partially enlarged sectional views showing another embodiment of the present invention.

The basic structure of the solenoid valve in this embodiment is the same as that shown in FIGS. 6 and 7, and an opening / closing member 26 is provided on a bar member 24 a protruding from the tip of the stopper 24. When the diaphragm 4 is in pressure contact with the valve seat 7, the opening / closing member 26 is fitted into the bypass hole 14 as shown in FIG. 8 (a), and the opening degree of the opening / closing member 26 is formed in the opening / closing member 26. The diameter of the communication hole 16a is set.

When the diaphragm 4 is separated from the valve seat 7, the opening / closing member 26 is disengaged from the bypass hole 14 and the opening degree of the bypass hole 14 increases. With such a structure, the responsiveness of the diaphragm 4 can be speeded up both when the ports 5a and 5b are in communication and when they are closed.

As described above, the present invention has been specifically described based on the embodiments, but the present invention is not limited to the first to fifth embodiments, and various modifications can be made without departing from the gist of the invention.

Further, the structure in which the cross-sectional area of the bypass hole in the present invention is variable is not limited to the structure shown in the first to fifth embodiments.

[Effect of device]

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

(1) When the diaphragm is opened to connect the input port and the output port, the communication opening of the bypass hole becomes small, so a differential pressure is generated between the pilot chamber and the input port, and the diaphragm quickly opens. When opening and closing, the communication opening of the bypass hole becomes large, so that the pilot chamber and the input port easily have the same pressure, and the diaphragm closes quickly, so that the responsiveness of the diaphragm can be accelerated. it can.

(2) Since the response of the diaphragm is good, the operational reliability of the solenoid valve can be improved.

(3) By forming the opening / closing means by the opening / closing member attached to the valve housing, the flow passage can be surely opened / closed with a simple structure.

(4) The opening / closing timing of the opening / closing member is adjusted by forming the opening / closing means by the opening / closing member attached to the diaphragm so as to be openable and closable and the stopper abutting against the opening / closing member.

[Brief description of drawings]

FIG. 1 is a sectional view showing a solenoid valve which is an embodiment of the present invention,
2 is an enlarged sectional view showing a part of the solenoid valve of FIG. 1, FIG.
1 is an enlarged plan view showing an opening / closing member used in the solenoid valve of FIG. 1, FIG. 4 is a partially enlarged sectional view showing a solenoid valve which is another embodiment of the present invention, and FIG. 5 is the present invention. 6 is a partially enlarged sectional view showing a solenoid valve which is another embodiment of the present invention, FIG. 6 is a sectional view showing a solenoid valve which is another embodiment of the present invention, and FIGS. 7 (a) and 7 (b).
6 is a partially enlarged sectional view showing the opened / closed state of the opening / closing member of the solenoid valve shown in FIG. 6, FIGS. 8 (a) and 8 (b) are partially enlarged sectional views showing another embodiment of the present invention, and FIG. Figures (a) and (b) are cross-sectional views showing a solenoid valve considered by the inventor when developing the present invention. DESCRIPTION OF SYMBOLS 1 ... Valve housing, 2 ... Solenoid part, 2a ... Protective cap, 2b ... Fixed core, 2c ... Solenoid coil, 2d ... Recessed part, 3 ... Pilot valve, 4 ... Diaphragm, 5a ... Input port, 5b ... Output port, 6 ... Pilot chamber, 6a ... Communication side opening, 7 ... Valve seat, 7a ... Communication side opening, 8 ... Movable member, 9 ... Valve body, 10 ... Spring, 11 ... Valve body, 12 ... Diaphragm body, 13 ... Valve seat , 13a ... Valve hole, 14 ... Bypass hole, 15 ... Set screw, 16 ... Opening / closing member (opening / closing means), 16a ... Communication hole, 17 ... Projection part, 18 ... Opening / closing member (opening / closing means), 19 ... Gap, 20 ... Support member, 21 ... Hole, 22 ... Through hole, 24 ... Stopper (opening / closing means), 25 ... Opening / closing member (opening / closing means), 26 ... Opening / closing member (opening / closing means).

Claims (3)

[Scope of utility model registration request] 1. A valve housing having a valve seat (7) defining an opening on the communication side between the input port (5a) and the output port (5b).
(1), the pilot chamber (6) formed in the valve housing (1) and the communication side opening, and the input port (5)
Bypass hole (14) that connects a) with the pilot chamber (6)
A diaphragm (4) formed with the pilot chamber (6) formed in the diaphragm (4)
And a valve hole (13a) that connects the output port (5b) with each other, a pilot valve (3) that is driven by a solenoid to open and close from the pilot chamber (6) side, and the diaphragm (4) has the valve seat ( When the diaphragm (4) is away from the valve seat (7), the opening of the bypass hole (14) communicating with the input port (5a) is reduced when it is pressed against the valve seat (7). An electromagnetic valve comprising: an opening / closing means (16, 18, 25, 26) for increasing the communication opening degree of (14). 2. The opening / closing means is constituted by opening / closing members (16, 18) attached to a valve housing (1), and when the diaphragm (4) is in pressure contact with the valve seat (7), the bypass hole ( 14) approaches the opening / closing member and its opening becomes smaller,
The solenoid valve according to claim 1, wherein the opening of the bypass hole (14) is increased when the diaphragm (4) is separated from the valve seat (7). 3. The opening / closing means is provided on a diaphragm (4) so as to be elastically deformable, and an opening / closing means is formed so as to face the bypass hole (14) and a communication hole 16a having a diameter smaller than that of the bypass hole (14). A member 16 and a stopper 24 that abuts the opening / closing member 16 to expose the bypass hole (14) to the input port (5a) when the diaphragm (4) is separated from the valve seat (7). The solenoid valve according to claim 1, wherein the solenoid valve is provided.