JP3154114B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device which energizes a coil of an electromagnetic device to generate a magnetic force to attract a movable core to a fixed core. Opening and interrupting the current to one coil, the magnetic force disappears and the movable core separates from the fixed core by the spring force of the movable core spring, and the movement of the movable core operates the valve body to close the valve seat. To a solenoid valve.

[0002]

2. Description of the Related Art A conventional solenoid valve will be described with reference to FIG. Reference numeral 1 denotes a coil wound around the outer periphery of a cylindrical coil bobbin 2.
A is disposed in the housing 3 having an opening at the bottom. A lower magnetic pole piece 4 is disposed in a lower opening of the housing 3, and a packless pipe 5 having a pipe shape is erected toward the inside of the coil bobbin 2 at the center of the lower magnetic pole piece 4.
At the center of the upper bottom portion 3A of the housing 3, a fixed core 6 which is inserted and fixed above the packless pipe 5 is integrally disposed. Reference numeral 7 denotes a movable core that is movably disposed in the packless pipe 5 and that is disposed to face the fixed core 6.
A movable core spring 8 contracted between opposing surfaces of the movable core 7 receives a spring force so as to separate from the fixed core 6. The electromagnetic device S is formed by the housing 3, the lower magnetic pole piece 4, the movable core 7, and the fixed core 6 described above.

[0003] V is a valve body, which is divided into a primary flow path 10 and a secondary flow path 11 by a valve seat 9 disposed inside. The primary flow path 10 is connected to a pressure source such as a pump, and the secondary flow path 11 is connected to a consumption unit. The electromagnetic device S is disposed on the upper surface of the valve body V. At this time, the valve body 12 formed integrally with the movable core 7 is provided with a control hole 9A of the valve seat 9.
Are arranged opposite to each other.

In such an electromagnetic valve, when a current flows through the coil 1, the movable core 7 is attracted toward the fixed core 6 against the spring force of the movable core spring 8, and the valve body 12 opens the valve seat 9. According to this, the fluid having a high pressure in the fluid supply source is supplied to the consuming unit via the primary flow path 10, the valve seat 9, and the secondary flow path 11. On the other hand, when the current to the coil 1 is cut off, the movable core 7 separates from the fixed core 6 due to the spring force of the movable core spring 8 and the valve body 12
Is closed. According to this, the supply of the fluid from the fluid supply source to the consumption unit is shut off.

[0005]

However, such a conventional solenoid valve has the following disadvantages. (1) When the current supply to the coil 1 is cut off, the movable core 7 is separated from the fixed core 6 by the spring force of the movable core spring 8, and the valve body 12 moves toward the valve seat 9 and moves to the valve seat 9. Contact with impact force. And energization of the coil 1,
According to the repeated electric shielding, the valve body 12 and the valve seat 9
Abrasion occurs at the abutting portion, and improvement of the durability thereof has been desired. A wettable powder as a chemical solution (a liquid in which a pesticidal active ingredient which is hardly soluble in water and has no suitable solvent, is diluted and suspended with water in a formulation obtained by mixing and grinding a carrier such as a finely divided granular mineral). When used for liquid control, the fine powder carrier wears the valve body and the valve seat, and further improvement in durability has been desired. (2) The valve seat is formed integrally with the valve body, and when replacing a worn valve seat, it is necessary to replace the valve body together, and maintenance costs are expensive and not preferable. .

SUMMARY OF THE INVENTION 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 which is capable of improving the durability of a valve body and a valve seat portion and having excellent maintainability. It is in.

[0007]

According to the solenoid valve of the present invention, a flow path formed in a valve body is divided into a primary flow path and a secondary flow path by a valve seat. Valve is opened and closed by a valve body that moves synchronously with the movable core of the electromagnetic device, a valve seat accommodating chamber is formed in the valve body along the moving direction of the valve body, and an upstream of the valve seat accommodating chamber is provided. Side is opened to the primary side flow path connected to the pressure source, and the downstream side of the valve seat storage chamber is opened to the secondary side flow path connected to the consuming unit via the locking step, and the valve seat storage chamber is opened. The valve seat provided with the control hole is movably arranged, and a spring is locked on an end face of the primary flow passage facing the primary flow passage of the valve seat. The end face of the facing secondary side flow path is elastically in contact with the locking step, and is arranged.
The spring force of the spring is greater than the spring force of the movable core spring of the electromagnetic device that urges the movable core in a direction away from the fixed core.

[0008]

When the valve body comes into contact with the valve seat, the impact force applied to the valve seat is absorbed by the spring moving slightly by the spring, so that the impact load can be reduced, and the valve seat and the valve body can be reduced. Wear can be reduced. Also, when the valve seat wears,
Since the valve seat can be removed from the valve seat storage chamber and replaced, the maintenance can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the solenoid valve according to the present invention will be described below with reference to FIG. The same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. In the valve body V, a cylindrical valve seat storage chamber 20 is formed along the moving direction X-Y of the valve body 12 (in other words, the moving direction of the movable core 7 and the vertical direction in the figure). On the upstream side (corresponding to the lower side) of the chamber 20, a primary flow path 10 connected to a pressure source (not shown) is opened. The downstream side (corresponding to the upper side) of the valve seat storage chamber 20 is provided with a locking step 21.
And is connected to the secondary flow path 11 connected to the consuming unit through the opening. The locking step 21 in this example is formed by an E-clip, and is fitted and disposed in an annular groove 22 formed near the upper end of the inner periphery of the valve seat storage chamber 20. The inner diameter of the E-clip is formed smaller than the inner diameter of the valve seat storage chamber 20, thereby forming the locking step 21. Also, valve seat storage room 20
A part of the secondary flow path 11 facing the downstream side of the valve body V was opened at the upper surface V1 of the valve body V.

An annular valve seat 23 is disposed in the valve seat storage chamber 20 so as to be vertically movable. The lower surface of the valve seat 23 faces the primary side flow path 10 and the primary side flow path. A spring 24 is contracted between the road end surface 23A (the lower surface of the valve seat 23) and the lower bottom portion 20A of the valve seat storage chamber 20. According to the above, the valve seat 23 is urged upward by the spring 24, and the upper surface of the valve seat 23 faces the secondary flow path 11, and the secondary flow path end face 23B (the upper surface of the valve seat 23). Abuts against the locking step portion 21 to prevent upward movement. Then, in this state, the primary-side flow path end face 23 of the valve seat 23
A gap C is formed below A. At the center of the valve seat 23, a control hole 23C is formed so as to penetrate therethrough. Further, a seal member 25 is provided between the outer periphery of the valve seat 23 and the inner periphery of the valve seat storage chamber 20.
Is arranged. In this example, this seal member 25 is O
The seal member 25 does not prevent the valve seat 23 from moving up and down in the valve seat storage chamber 20, and between the outer circumference of the valve seat 23 and the inner circumference of the valve seat storage chamber 20. Is maintained. An electromagnetic device S is disposed on the upper surface V1 of the valve body V. The valve element 12 formed integrally with the movable core 7 of the electromagnetic device S faces the secondary side flow path 11 and has a valve seat 23. It is arranged in contact with the control hole 23C. In this state, the spring force of the spring 24 is set to be larger than the spring force of the movable core spring 8. Accordingly, the valve body 12 comes into contact with the control hole 23C of the valve seat 23 in a state where the secondary flow path end face 23B of the valve seat 23 is in contact with the locking step portion 21.

Next, the operation will be described. Coil 1
When no current is applied to the magnetic device S, no magnetic attraction force is generated in the electromagnetic device S, and the movable core 7 moves downward by receiving the spring force of the movable core spring 8. According to this, the valve body 12 is brought into contact with the valve seat 23 and the control hole 23C
And the primary side flow path 10 and the secondary side flow path 11 are shut off, so that the fluid from the fluid supply source is not supplied to the consuming unit. In the closed state of the control hole 23C by the valve body 12, the spring force of the spring 24 is set to be larger than the spring force of the movable core spring 8, so that the valve seat 23 is closed.
The secondary-side flow path end surface 23B is held in contact with the locking step portion 21.

Next, when a current is applied to the coil 1, a magnetic attraction force is generated in the electromagnetic device S, and the movable core 7 is fixed to the fixed core 6 against the spring force of the movable core spring 8 pressing the movable core 7. It is sucked toward the lower end. According to the upward movement of the movable core 7, the valve element 12 is controlled by the control hole 2 of the valve seat 23.
3C is opened, and the fluid of the fluid supply source flows down to the consuming unit via the primary side flow path 10, the control hole 23C of the valve seat 23, and the secondary side flow path 11.

When the supply of current to the coil 1 is cut off again, the magnetic attraction of the electromagnetic device S disappears, and the movable core 7 including the valve element 12 is moved downward by the spring force of the movable core spring 8. The valve body 12 moves and the control hole 23C of the valve seat 23 is closed again, so that the primary side flow path 10
Block the flow of fluid towards 1. Here, according to the solenoid valve of the present invention, when the valve body 12 closes the valve seat hole 23C, the impact force of the valve body 12 on the valve seat 23 in the closing direction is reduced. That is, the movable core 7 is moved downward by the spring force of the movable core spring 8 due to the disappearance of the magnetic attraction force of the electromagnetic device S. At this time, the force at which the valve body 12 collides with the valve seat is reduced by the movable core. An impact force is added in which the spring force of the spring 8 and the inertial force due to the downward movement of the movable core 7 and the valve body 12 are applied. According to the above, this impact force becomes a force larger than the spring force of the movable core spring 8, and overcomes the spring force of the spring 24 set to be larger than the spring force of the movable core spring 8 to slightly move the valve seat 23. It bends downward. In other words, the spring force of the spring 24 is such that the valve body 12
In the closed holding state in which the third control hole 23C is already closed, the spring force of the movable core spring 8 is set to be larger. Further, in a closing operation state in which the valve body 12 moves toward the valve seat 23 and closes the control hole 23C, an impact formed by the sum of the spring force of the movable core spring 8 and the inertial force of the movable core 8 and the valve body 12 is applied. It is set slightly lower than the force.

As described above, when the valve body 12 contacts the control hole 23C of the valve seat 23 and closes the control hole 23C, the valve seat 23 is closed.
Can be slightly bent, the impact force at the time of contact can be greatly reduced, and the wear durability of the contact portions of the valve body 12 and the valve seat 23 can be greatly improved. is there.

The movable core 7 including the valve element 12 and the valve seat 2
The fact that the impact force at the time of contact with No. 3 can be reduced can reduce the tapping sound generated at the time of contact, and can provide a quiet solenoid valve.

Also, in the solenoid valve of the present invention, it is necessary to replace the valve seat 23 when the number of uses exceeds a certain number of times.
In such a case, the electromagnetic device S is detached from the valve body V,
Next, the locking step portion 21 made of the E-clip is removed from the annular groove 22, and then the valve seat 23 is replaced. According to the above, it is possible to improve the maintainability of the valve seat 23 and to provide a solenoid valve which can re-use the valve body V and has excellent economic efficiency.

The spring 24 is disposed facing the high-pressure side primary side flow path 10 connected to the pressure source. It is possible to set the valve seat 23 weaker than when it is arranged in the valve seat storage chamber 2.
The workability of mounting in the inside can be improved.

[0018]

As described above, according to the solenoid valve of the present invention, when the valve body including the movable core comes into contact with the valve seat,
Since the impact force applied to the valve seat can be greatly reduced, the durability of the valve seat and the valve body can be improved, and the hitting sound generated at the time of contact can be reduced. In addition, when wear of the valve seat occurs, only the valve seat needs to be removed from the valve body and replaced, so that the maintainability can be improved.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 6 fixed core 7 movable core 8 movable core spring 10 primary side channel 11 secondary side channel 20 valve seat storage chamber 21 locking step portion 23 valve seat 23A primary side channel end surface 23B secondary side channel end surface 24 Spring S Electromagnetic device V Valve body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-16723 (JP, A) JP-A-7-260037 (JP, A) JP-A-7-243547 (JP, A) 23729 (JP, U) Actually open 62-191972 (JP, U) Actually open 53-80831 (JP, U) Actually open 61-70667 (JP, U) Actually open 6-35758 (JP, U) Japanese Patent Publication No. 57-40945 (JP, B2) Japanese Patent Publication No. 57-33473 (JP, B2) Japanese Utility Model Showa 47-24003 (JP, Y1) Japanese Utility Model Publication No. 25990 (JP, Y2) (58) (Int.Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (1)

(57) [Claims] 1. A flow path formed in a valve body is divided into a primary flow path and a secondary flow path by a valve seat, and the valve seat is moved synchronously with a movable core of an electromagnetic device. In a solenoid valve controlled to be opened and closed by a valve element, a valve seat storage chamber 20 is formed in the valve body V along the moving direction of the valve element 12 and a primary side connected to a pressure source at an upstream side of the valve seat storage chamber. An opening is formed in the flow passage 10, and a downstream side of the valve seat storage chamber 20 is opened in a secondary flow passage 11 connected to the consuming unit via the locking step 21, and a control hole 2 is provided in the valve seat storage chamber.
The valve seat 23 having the 3C is movably disposed, and the primary-side channel end face 23 facing the primary-side channel 10 of the valve seat 23.
A by locking the spring 24 to the valve seat 23.
The secondary-side flow path end face 23B facing the secondary-side flow path 11 is disposed so as to elastically abut on the locking step portion 21. On the other hand, the spring force of the spring 24 is used to move the movable core 7 from the fixed core 6. An electromagnetic valve characterized in that the spring force is greater than the spring force of a movable core spring 8 of an electromagnetic device S that urges in a direction in which the electromagnetic device S separates.