JP2898400B2 - solenoid valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an electromagnetic valve, and more particularly, to an electromagnetic valve in which a column and a plunger are slidably provided in a shaft hole of a solenoid portion so as to be opposed to each other. Regarding effective technology.

[Conventional technology]

As this type of solenoid valve, for example, the following can be considered.

That is, the solenoid valve includes a solenoid portion having a shaft hole, a valve body connected to one end of the solenoid portion, and having a communication chamber having a port with a valve seat therein and communicating with the shaft hole. A column and a plunger provided opposite to each other in the shaft hole, and a biasing means for moving the plunger by a biasing force to press against the valve seat; the column can be moved along the inner peripheral surface of the shaft hole. In addition to the movable structure, a seal is provided between the flange of the column and the opening end of the shaft hole.

Then, after the plunger is moved in the direction of the column by a predetermined stroke by the magnetic attraction force of the solenoid to contact the column, the column is moved in the direction toward the communication chamber while the plunger is sucked by the air pressure in the communication chamber. The plunger is moved in the opposite direction by another predetermined stroke, thereby increasing the stroke of the plunger so that the supply or discharge flow rate of the compressed air can be increased.

[Problems to be solved by the invention]

However, in the structure of the above-described conventional solenoid valve, a seal is provided between the flange of the column and the opening end of the shaft hole. Therefore, when the column moves to the plunger side, the column does not perform braking by the seal. Therefore, there is a possibility that responsiveness may decrease due to an increase in response time.

In addition, since the seal is provided between the flange of the column and the opening end of the shaft hole, when the column moves in the direction away from the seal, the sealability may be reduced.

Further, since the flange is in contact with the magnetic ring provided at the opening end of the shaft hole to prevent the column from sliding toward the communication chamber, the column sliding may be affected by the magnetic force. is there.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a solenoid valve capable of improving responsiveness.

Another object of the present invention is to provide a solenoid valve capable of improving sealing performance.

Still another object of the present invention is to provide an electromagnetic valve in which sliding of a movable column is not affected by a magnetic force.

[Means for solving the problem]

The outline of a typical invention among the inventions disclosed in the present application will be briefly described as follows.

The structure of the solenoid valve according to the present invention is a valve body including a solenoid portion having a shaft hole, and a communication chamber connected to one end of the solenoid portion and communicating with the shaft hole and having a port with a valve seat therein. An electromagnetic valve comprising: a movable column and a plunger slidably provided opposite to each other in the shaft hole; and urging means for moving the plunger by an urging force and pressing against the valve seat. Between the flange of the movable column and the opening end of the shaft hole, the movable column is attracted to the plunger by the magnetic attraction of the solenoid to prevent the movable column from moving toward the communication chamber and move in the opposite direction. In addition, a stopper made of a non-magnetic material is provided to permit the operation, and a seal is provided between the flange of the movable column and the inner wall of the flange storage chamber having the discharge port.

[Action]

According to the solenoid valve of the present invention, between the flange of the movable column and the opening end of the shaft hole, the movable column is attracted to the plunger by the magnetic attraction of the solenoid and moves toward the communication chamber. The structure is provided with a stopper made of a non-magnetic material that prevents movement in the opposite direction, thereby increasing the magnetic resistance between the flange of the movable column and the opening end of the shaft hole. .

Therefore, the sliding of the movable column is not affected by the magnetic force.

Further, since the seal is provided between the flange of the movable column and the inner wall of the flange storage chamber having the discharge port, when the movable column is separated from the plunger, the flange of the movable column is in contact with the inner wall of the flange storage chamber. The seal can be pressed to improve the sealability.

Furthermore, a seal is provided between the flange of the movable column and the inner wall of the flange storage chamber having the discharge port, and in the OFF operation state, the flange is in contact with the stopper, so that the movable column is turned on during the ON operation. The movement to the plunger side and the braking by the seal at the time of this movement can be eliminated, the response time can be reduced, and the response can be improved.

The above and other objects and novel features of the present invention are as follows.
It will be apparent from the description of this specification and the accompanying drawings.

Embodiment 1 FIG. 1 is a sectional view showing a solenoid valve according to Embodiment 1 of the present invention.

The solenoid valve according to the first embodiment is a three-port type and has a valve body 1. A solenoid 2 and a cover 3 are coaxially connected to the valve body 1.

The valve body 1 has a communication chamber 4, and an output port A and an input port P communicate with the communication chamber 4.
A first valve seat 7 protrudes from an inner end of the first valve seat.

The solenoid portion 2 has a shaft hole 8, a coil 9 is wound around the outer periphery of the shaft hole 8, and a movable column 10 and a plunger 11 are slidable on the inner peripheral surface of the shaft hole 8 so as to face each other. It is provided in.

The plunger 11 has a first poppet 12 and a flange 13 at a lower end, and has a second poppet 14 at an upper end.

A plunger spring 6 (biasing means) is provided between the flange 13 and the magnetic ring 5 provided at the lower opening end of the shaft hole 8, and the plunger spring 6 moves the plunger 11 by a biasing force. And has a function of pressing the first poppet 12 against the first valve seat 7.

A first discharge passage 17 having a groove shape is formed on the outer peripheral surface of the plunger 11.

The cover 3 has a discharge port R at the center and a flange storage chamber 18 connected to the shaft hole 8 of the solenoid portion 2 is formed inside. The movable column 10 is slidably provided in the shaft hole 8 and has a flange 19 at an upper end.
19 is stored in the flange storage chamber 18.

The movable column 10 has a second discharge path 20 at the center, and a second valve seat 21 is protruded from a lower open end of the second discharge path 20.

The gist of the first embodiment is that a seal 24a and a stopper 23 are provided in the flange storage chamber 18.

That is, an annular fitting groove 16 centering on the discharge port R is formed in the peripheral portion of the upper wall of the flange storage chamber 18, and the seal 24a is fitted in the fitting groove 16. This seal 24a
Is formed of an annular elastic member having an elliptical cross section, and has a function of preventing leakage of compressed air in the flange storage chamber 18.

The stopper 23 is provided on the magnetic ring 22.
The stopper 23 has a function of preventing the movable column 10 from pulling down with the plunger 11 due to the magnetic attraction of the solenoid portion 2 and allowing the movable column 10 to move up.

The stopper 23 is formed of non-magnetic plastic or metal, and has a structure in which the sliding of the movable column 10 is not affected by magnetic force due to the non-magnetic property.

 In addition, 15 is an O-ring.

 Next, the operation of the first embodiment will be described.

In the OFF operation state shown on the left side in FIG. 1, the urging force of the plunger spring 6 acts against the upward force due to the air pressure acting on the input port P, so that the plunger 11 moves downward, Is pressed against the first valve seat 7, and the first valve seat 7 is closed.

The movable column 10 tends to move downward due to its own weight and the elastic force of the seal 24a, but its movement is prevented by the flange 19 hitting the stopper 23.

Therefore, a gap of Sb is formed between the flange 19 and the upper wall of the flange storage chamber 18, and the movable column 10 and the plunger 11
Is formed between them.

In such an OFF operation state, when a voltage is applied to the solenoid unit 2 to make it an ON operation state, in the ON operation state,
When the coil 9 is excited, the plunger 11 and the movable column 10
Attract each other, the plunger 11 rises by the stroke Sa against the urging force of the plunger spring 6, and comes into contact with the movable column 10.

After the contact, a differential pressure is generated between the flange storage chamber 18 and the communication chamber 4, and this differential pressure acts on the movable column 10.

Therefore, the movable column 10 rises by the stroke Sb while the plunger 11 is attracted.

As a result, the second poppet 14 closes the second valve seat 21 and
The first poppet 12 opens the first valve seat 7, and a gap of Sa + Sb is formed between the first valve seat 7 and the first poppet 12.

Thus, a large amount of compressed air can be supplied from the input port P to the actuator through the communication chamber 4 and the output port A.

When the energization of the solenoid unit 2 is released from such an ON operation state, the plunger 11 moves downward by the plunger spring 6, but a differential pressure remains between the flange storage chamber 18 and the communication chamber 4 in the movable column 10. Therefore, a gap of Sa + Sb is formed between the second valve seat 21 and the second poppet 14 to open the valve, and the compressed air in the actuator is supplied to the output port A, the first and second discharge paths 17, A large amount is exhausted from the exhaust port R through 20.

As described above, the flow direction of the compressed air can be switched, and the supply or discharge flow rate of the compressed air can be increased. However, in the first embodiment, the stopper 23 made of non-magnetic plastic or metal is placed on the magnetic ring 22. Because of the structure provided, a gap having a magnetic resistance is formed between the flange 19 and the magnetic ring 22 even when the flange 19 of the movable column 10 contacts the stopper 23.

Therefore, the sliding of the movable column 10 is not affected by the magnetic force.

Further, the seal 24a is made of an annular elastic member having the above-mentioned elliptical shape, and has a structure in which the seal 24a is fitted in the fitting groove 16 formed in the upper wall of the flange storage chamber 18. When the pressure rises, the flange 19 presses the seal 24a with the fitting groove 16 formed on the upper wall of the flange accommodating chamber 18 to improve the sealing performance.

Further, since the seal 24a is provided above the flange 19 and the flange 19 abuts against the stopper 23 in the OFF operation state, the lowering of the movable column 10 and the braking by the seal 24a at the time of the lowering are performed. The response time can be reduced, and the responsiveness can be improved.

Second Embodiment FIG. 2 is a sectional view showing a solenoid valve according to a second embodiment of the present invention.

The solenoid valve according to the second embodiment has substantially the same configuration as that of the first embodiment, except that the seal 24b is made of an annular elastic member having a V-shaped cross section, and is formed on the upper wall of the flange storage chamber 18. A feature is that a seal 24b is fitted in the groove 16 and the open side of the V-shaped cross section is directed toward the inner peripheral surface of the flange storage chamber 18.

Regarding the operation and effect of the second embodiment, in addition to the operation and effect of the first embodiment, since the seal 24b is formed of an annular elastic member having a V-shaped cross section, the seal 24b is excellent in the air pressure in the flange storage chamber 18. It can exhibit sealing properties.

Further, when the movable column 10 moves up, the braking by the seal 24b can be reduced, so that the response time can be further reduced and the responsiveness can be further improved.

Third Embodiment FIG. 3 is a sectional view showing a solenoid valve according to a third embodiment of the present invention.

The solenoid valve according to the third embodiment has substantially the same configuration as that of the first embodiment, but uses a diaphragm 24c as a seal, and attaches the inner peripheral edge of the diaphragm 24c to the movable column 10c.
This is characterized in that the outer peripheral surface of the diaphragm 24c is engaged with the lower end of the tapered inner peripheral surface of the flange storage chamber 18.

Regarding the operation and effect of the third embodiment, in addition to the operation and effect of the first embodiment, since the diaphragm 24c is used as the seal, air leakage can be reliably prevented, and the sealing performance can be further improved.

Also, when the movable column 10 rises, the diaphragm 24c
Therefore, the response time can be further reduced and the responsiveness can be further improved.

Fourth Embodiment FIG. 4 is a sectional view showing a solenoid valve according to a fourth embodiment of the present invention.

The solenoid valve according to the fourth embodiment has substantially the same configuration as that of the first embodiment, except that the seal 24d is formed of an annular elastic member having a V-shaped cross section, and the inner peripheral surface of the flange storage chamber 18 and the movable column. The seal 24d is provided between the outer peripheral surface of the flange 19 of FIG. 10 and the open side of the V-shaped cross section is directed downward, and a stopper 23a whose outer peripheral surface is enlarged is used as a stopper. Is characterized in that the outer peripheral surface of the flange is fitted to the stepped enlarged inner peripheral surface 18a of the flange storage chamber 18.

Regarding the operation and effect of the fourth embodiment, in addition to the operation and effect of the first embodiment, since the seal 24d is formed of an annular elastic member having a V-shaped cross section, the seal 24d is excellent in the air pressure in the flange storage chamber 18. It can exhibit sealing properties.

Further, when the movable column 10 moves up, the braking by the seal 24d can be reduced, so that the response time can be further reduced and the responsiveness can be further improved.

As described above, the invention made by the present invention has been specifically described based on the embodiments. However, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof. Nor.

For example, in the embodiments 2 and 4, the seal is made of an annular elastic member having a V-shaped cross section, and is fitted in a fitting groove formed in the inner wall on the discharge port side of the flange storage chamber. Although the case where it is fitted between the inner peripheral surface of the storage chamber and the outer peripheral surface of the flange of the movable column has been described, the present invention is not limited to this, and a seal having a U-shape can be used.

In the first to fourth embodiments, the case in which the plastic stopper is provided on the magnetic ring has been described.
However, the present invention is not limited to this, and the stopper can be integrally formed with the jacket of the solenoid portion by a plastic mold.

In the above description, the invention made mainly by the inventor has been described with respect to the pneumatic solenoid valve as a field of application, but the invention can also be applied to a hydraulic solenoid valve.

〔The invention's effect〕

The effects obtained by typical aspects of the invention disclosed in the present application will be briefly described as follows.

(1). Between the flange of the movable column and the opening end of the shaft hole, the movable column is attracted to the plunger by the magnetic attraction of the solenoid to prevent the movable column from moving toward the communication chamber, and move in the opposite direction. Since the structure is provided with a stopper made of a non-magnetic material, the magnetic resistance between the flange of the movable column and the opening end of the shaft hole can be increased.

(2). Therefore, the sliding of the movable column is not affected by the magnetic force.

(3). Since the seal is provided between the flange of the movable column and the inner wall of the flange storage chamber having the discharge port, when the movable column is separated from the plunger, the flange of the movable column is sealed with the inner wall of the flange storage chamber. Can be pressed against each other to improve the sealing property.

(4). A seal is provided between the flange of the movable column and the inner wall of the flange storage chamber having the discharge port. In the OFF operation state, the flange is in contact with the stopper, so the movable column plunger side during ON operation Movement and braking by the seal during this movement,
Response time can be reduced, and responsiveness can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a solenoid valve according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a solenoid valve according to a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. FIG. 4 is a cross-sectional view showing a solenoid valve according to a fourth embodiment of the present invention. 1... Valve body, 2... Solenoid part, 3... Cover, 4. 5 ... magnetic ring, 6 ... plunger spring (biasing means), 7 ... first valve seat, 8 ... shaft hole, 9 ... coil, 10 ... movable column, 11 ... plunger, 12 ... ... First poppet, 13 ... Flange, 14 ... Second poppet, 15 ... O-ring, 16 ... Fit groove, 17 ... First discharge path, 18 ... Flange storage chamber, 18a ... ... stepped inner diameter inner peripheral surface, 19 ... flange, 20 ... second discharge path, 21 ... second valve seat, 22 ... magnetic ring, 23 ... stopper, 23a ... stopper, 2 4a …… Seal, 24b …… Seal, 24c …… Diaphragm, 24d …… Seal. P: Input port, A: Output port, R: Discharge port, Sa: Stroke, Sb: Stroke.

Claims (4)

(57) [Claims] A valve body having a solenoid portion having a shaft hole, a communication chamber connected to one end of the solenoid portion and communicating with the shaft hole and having a port with a valve seat therein; A movable column and a plunger slidably provided in opposition to each other; and a biasing means for moving the plunger by a biasing force to press against the valve seat. The movable column is prevented from moving toward the communication chamber by being attracted to the plunger by the magnetic attraction force of the solenoid portion between the shaft and the opening end of the shaft hole, and is allowed to move in the opposite direction. An electromagnetic valve comprising: a stopper made of a non-magnetic material; and a seal provided between a flange of a movable column and an inner wall of a flange storage chamber having a discharge port. 2. The seal according to claim 1, wherein the seal is formed of an annular elastic member having a V-shaped cross section, and is fitted in a fitting groove formed in an inner wall of the flange housing chamber on the discharge port side. The described solenoid valve. 3. The seal is a diaphragm, wherein the inner peripheral edge of the diaphragm is engaged with the outer peripheral surface of the flange of the movable column, and the outer peripheral edge of the diaphragm is engaged with the inner peripheral surface of the flange accommodating chamber. The solenoid valve according to claim 1, wherein 4. The seal is formed of an annular elastic member having a V-shaped cross section, and is provided between an outer peripheral surface of a flange of a movable column and an inner peripheral surface of a flange accommodating chamber. The solenoid valve according to claim 1.