JPH034869Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a 3-port air solenoid valve, and in particular,
Related to pilot type poppet type solenoid valve.

[Prior art]

Conventionally, this type of solenoid valve has a main valve Va and a pilot solenoid valve Vb, as shown in Fig. 2.
The main valve Va is composed of body 11.
and a valve body 10 consisting of upper and lower covers 12 and 13, a valve body 20 and a spring 30 incorporated into the valve body 10.
It is composed of. The body 11 includes a supply port 11a connected to an air pressure source (not shown);
It has a load port 11b connected to an actuator (not shown), a discharge port 11c communicating with the atmosphere, passages 11d, 11e, and 11f, and a first valve seat 11g and a second valve seat 11h. , both valve seats 11g and 11h are coaxially provided.

The valve body 20 is assembled coaxially and movably in the axial direction with both valve seats 11g and 11h, and is supported by a spring 30.
The first poppet 21 is urged upward in the figure by
1 via a connecting rod 23 and seats on the second valve seat 11h at the downward moving end; A piston 24 (this piston 2
4 has a pressure receiving area B larger than the seat area A of the first poppet 21). The pilot chamber R1 is always in communication with the control chamber R2 through a through hole 12a provided in the upper cover 12, and the chamber R2 is formed on the outer periphery of the valve plunger 41 of the pilot solenoid valve Vb when the valve plunger 41 is in the illustrated state. passage 42 provided in the fixed core 43, passage 43a provided in the fixed core 43, and cap 4.
4 is communicated with the atmosphere through a through hole 44a provided in the
When the passage 43a is closed and the passage 12b provided in the upper cover 12 is opened, the supply port 11a is communicated through the passage 12b and the passage 11d of the body 11.

On the other hand, the pilot solenoid valve Vb is composed of the above-mentioned valve plunger 41 and fixed core 43, a spring 44 that urges the valve plunger 41 downward, an electromagnetic coil 45, etc., and when the electromagnetic coil 45 is energized, Control room R2 to supply port 11
a, and when the power is not energized, the control room R2 is communicated with the atmosphere as shown in the figure.

A knob 51 and a ball 52 attached to the upper cover 12 are used to manually move the valve plunger 41 upward, and the knob 51 is prevented from coming off by a pin 53.

However, in the same solenoid valve, the load port 11b
In order to cut off the communication between the discharge port 11c and the load port 11b and to communicate the load port 11b with the supply port 11a, the electromagnetic coil 45 of the pilot solenoid valve Vb is energized to communicate the pilot chamber R1 with the supply port 11a, and the supply port 11a is From pilot room R1
Air (compressed air) is guided to move the valve body 20 downward with the air pressure, and the first poppet 21 is moved to the first valve seat 1.
1g and seat the second poppet 22 on the second valve seat 11h.

[Problem that the invention attempts to solve]

By the way, in the conventional 3-port air solenoid valve described above, when in use, the force of the spring 30 is applied to the valve body 20 and the supply pressure is applied to the seat area A of the first poppet 21 in the illustrated state (when the electromagnetic coil 45 is not energized). The force multiplied by is acting upward.

Therefore, in the solenoid valve, the valve body 20 does not move downward unless the pressure in the pilot chamber R1 rises to a pressure close to the supply pressure. In this solenoid valve, the valve plunger 41 immediately moves upward when the electromagnetic coil 45 is energized, and the pilot chamber R1 communicates with the supply port 11a, but air flows from the passage 12b to the control chamber R2 and the through hole 12a. Since it flows into the pilot chamber R1 through the valve body R1, it takes a considerable amount of time for the pressure in the pilot chamber R1 to rise from atmospheric pressure to a pressure close to the supply pressure. It takes a long time for it to move downward.

[Means for solving problems]

The present invention was developed to solve the above-mentioned problem, that is, the long response time when energizing is applied. A valve body comprising a first valve seat provided in a passage communicating with a load port and a second valve seat provided in a passage communicating with the load port and an exhaust port communicating with the atmosphere are coaxially provided; a first poppet that is assembled within the valve body so as to be movable coaxially and axially with the valve seats, is biased by a spring in one direction, and is seated on the first valve seat at a one-way moving end; A valve consisting of a second poppet connected to the poppet via a connecting body and seated on the second valve seat at the end of movement in the other direction, and a piston integrally provided with the second poppet and forming a pilot chamber in the back. A three-port air solenoid valve comprising a main valve configured by a body and a pilot solenoid valve for selectively communicating the pilot chamber with the supply port or the atmosphere, wherein the The present invention is characterized in that a chamber is coaxially provided facing the pilot chamber and always communicating only with the load port, and a portion of the valve body is exposed by extending into the chamber.

[Effect of invention]

In the 3-port air solenoid valve according to the present invention,
When the electromagnetic coil is de-energized, the load port is cut off from communicating with the supply port, and the part of the valve body that communicates with the discharge port and is exposed inside the chamber is exposed to atmospheric pressure. The force acting on the valve body toward the pilot chamber is reduced by the force obtained by multiplying the pressure-receiving area by the supply pressure compared to the prior art. Therefore,
If the pressure-receiving area of the piston is the same as the conventional one, when the electromagnetic coil is energized, the valve body will move when the pressure in the pilot chamber rises to a lower pressure than the conventional one, and the response will be The time is shorter than before.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a solenoid valve according to the present invention, which is composed of a main valve Va and a pilot solenoid valve Vb, and the shape of the body 11 and lower cover 13 of the valve body 10 of the main valve Va. and,
The shapes of the first poppet 21 and connecting rod 23 in the valve body 20 of the main valve Va are only slightly different from the shapes of the conventional solenoid valve shown in FIG. 2, and the other configurations are exactly the same as the conventional solenoid valve. The same reference numerals are used to omit the explanation.

The lower cover 13 has a through hole 13 provided therein.
a and a passage 11e of the body 11 through a through hole 11j provided in the body 11, that is, a load port 11b.
The lower end of the connecting rod 23, which is fitted in the inner hole 13b of the lower cover 13 airtightly and slidably in the axial direction, is exposed in the chamber R3. (Instead of the lower end of the connecting rod 23, the lower end of the first poppet 21 may be exposed in the chamber R3.) In the solenoid valve according to the present invention configured as described above, When using it, load port 1 in the state shown in the diagram.
1b is cut off from communication with the supply port 11a and communicates with the discharge port 11c, and the chamber R3
Since atmospheric pressure is acting on the lower end pressure receiving surface C of the connecting rod 23 exposed to It is the sum of the forces obtained by multiplying the value obtained by subtracting the lower end pressure receiving surface C of the connecting rod 23 by the supply pressure. The upward force acting on the valve body 20 is reduced compared to a solenoid valve.

Therefore, when the electromagnetic coil 45 is energized, the valve body 20 moves downward when the pressure in the pilot chamber R1 rises to a pressure lower than that of the conventional valve body, and the response time thereof is shorter than that of the conventional valve body. It will be shorter than .

In addition, in the solenoid valve according to the present invention, the electromagnetic coil 45 is de-energized from the energized state to the control room R2.
When the valve is shut off from the supply port 12a and communicated with the atmosphere, the air in the pilot chamber R1 is released to the atmosphere, and the valve body 20 is moved by the force of the spring 30 and the second poppet 22.
The lifting operation is performed by the combined force of the sheet area D multiplied by the supply pressure. For this reason, the valve body 20
quickly enters the state shown in the figure, and the load port 11b is cut off from communicating with the supply port 11a and communicated with the discharge port 11c. Incidentally, such operation can be similarly obtained by the conventional solenoid valve shown in FIG.

[Effect of idea]

As is clear from the above description, the present invention coaxially provides a chamber on the back of the first poppet that faces the pilot chamber and always communicates only with the load port, and also includes a part of the valve body inside the chamber. By extending and exposing the valve, the response time when the electromagnetic coil is energized is shortened.The spring force that biases the valve body in one direction is reduced, and the pressure-receiving area of the piston is increased. It is not designed to provide the desired effect (shortening of response time). Therefore, according to the present invention, the problem that occurs in the latter case, that is, the problem that the operational response is reduced when the electromagnetic coil is changed from the energized state to the de-energized state does not occur at all.

Further, since the present invention does not reduce the seat area of the first poppet in order to obtain the above-mentioned effect, it is possible to achieve the effect that it can be implemented without reducing the ability to pass from the supply port to the load port.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a 3-port air solenoid valve according to the present invention, and FIG. 2 is a sectional view showing an example of a conventional 3-port air solenoid valve. Explanation of symbols, 10... Valve body, 11a... Supply port, 11b... Load port, 11c... Discharge port, 11g... First valve seat, 11h... Second valve seat, 20... Valve body, 21...1st poppet, 22
...Second poppet, 23...Connection rod, 24...
...Piston, 30...Spring, Va...Main valve, Vb...
...Pilot solenoid valve, R1...Pilot chamber, R
3...Chiyamba.

Claims (1)

[Scope of utility model registration request] A first valve seat provided in a passage communicating between a supply port connected to an air pressure source and a load port connected to the actuator, and a second valve provided in a passage communicating between the load port and a discharge port communicating with the atmosphere. A valve body is provided with a seat coaxially provided therein, and the valve body is assembled into the valve body so as to be movable in the axial direction coaxially with both the valve seats, and is biased by a spring in one direction, and the second valve body is assembled in the valve body so as to be movable coaxially and axially with the two valve seats, and is biased by a spring in one direction. A first poppet seated on the first valve seat, a second poppet connected to the first poppet via a connecting body and seated on the second valve seat at a moving end in the other direction, and integrally provided on the second poppet. 3, comprising a main valve constituted by a valve body consisting of a piston and a valve body formed by a piston forming a pilot chamber at the back thereof, and a pilot solenoid valve for selectively communicating the pilot chamber with the supply port or the atmosphere. In the port air solenoid valve, a chamber is provided coaxially on the back of the first poppet, facing the pilot chamber and always communicating only with the load port, and a part of the valve body is extended and exposed within the chamber. A 3-port air solenoid valve characterized by: