JP2000266216A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the impact sound and hardly generate inferior separation by providing an impact reducing mechanism reducing the impact in sucking a plunger to a ball core. SOLUTION: An impact reducing mechanism 6 comprising a one-way valve 9 whose partition 9 arranged in a through hole 4a is opened only in a pole core side is arranged in a plunger 4 inside. When the plunger 4 is separated from the pole core 3, the valve for the partition 9a of the impact reducing mechanism 6 is in a closed state. When a coil 1 is energized and the pole core 3 sucks the plunger 4, the fluid can be substituted only in the outer circumference of the plunger 4 because the partition 9a is in the closed state, so that the moving speed of the plunger 4 is suppressed and the impact between the pole core 3 and the plunger 4 can be reduced. When the energization to the coil 1 is stopped and the plunger 4 is separated from the pole core 3, pressure difference caused by the negative pressure formed in a closed space between them and the inertial force of the fluid open the partition 9a so that the plunger 4 is quickly separated from the pole core 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid which is suitably used as an electromagnetic valve of an automatic faucet, a urinal cleaning device, a toilet cleaning device, etc., and more particularly to a function of reducing impact when a plunger is sucked into a pole core. The present invention relates to a solenoid having the following.

[0002]

2. Description of the Related Art Conventionally, as a low operating noise solenoid used as an electromagnetic valve of an automatic faucet, a urinal cleaning device, a toilet cleaning device, etc., as shown in FIG. It is known to provide a cushion made of a body.

In this device, an elastic shock absorbing material ring is provided at a contact portion between the pole core and the plunger, so that a metallic impact sound is not generated when the plunger is sucked into the pole core. Was.

[0004]

However, the conventional solenoid 100 has a problem that the magnetic efficiency when holding the plunger is low because a small gap is formed between the pole core and the plunger by the ring of the cushioning material. In addition, the detachability of the plunger may be poor due to the adhesiveness of the cushioning material ring which is an elastic body. Furthermore,
Although the impact noise is reduced by the cushioning material, the energy of the collision is transmitted to the solenoid main body, so that the main body including the pole core may be damaged by long-term use.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce a collision sound when a plunger is attracted to a pole core, to have a high magnetic efficiency at the time of holding, and to cause a disconnection failure. An object of the present invention is to provide a solenoid that is difficult to use, can be used for a long time, and can be used for various fluids.

[0006]

SUMMARY OF THE INVENTION The present invention provides a coil, a yoke serving as a magnetic path of a magnetomotive force generated by energizing the coil and enclosing the coil, and disposed at one end in the coil axial direction. A pole core, a plunger movably disposed on the axis in the center space in the coil radial direction and attracted to the pole core by energizing the coil, and an urging member for urging the plunger away from the pole core. Prepared,
It is characterized in that the plunger has an impact reducing function unit that reduces an impact when the plunger is sucked into the pole core.

According to this structure, the impact reducing function for reducing the impact when the plunger is attracted to the pole core is provided, so that the collision noise is small, the magnetic efficiency at the time of holding is high, and the disconnection failure occurs. It is possible to provide a solenoid which is difficult and can be used for a long period of time.

Further, if the impact reducing function section is set so as to function only when the plunger is sucked by the pole core and not to function when the plunger is separated from the pole core, the impact reducing function can be performed when the plunger is separated. Does not adversely affect

Further, if the impact reducing function section is configured so that the flow path area is small when sucking the pole core and the flow path area is large when separating from the pole core, the movement speed of the plunger during suction is reduced. The impact reduction function can be reliably operated while suppressing the pressure, and the separation can be quickly and reliably performed without causing the suction cup phenomenon at the time of separation.

Further, if the impact reducing function section can be easily replaced with one having a different performance, an optimal impact reducing function characteristic can be selected in accordance with the viscosity, moving speed and the like of the fluid.

Further, if the impact reducing function section is provided in the through hole inside the plunger, the impact reducing function section can be provided without increasing the size of the solenoid as compared with the conventional one.

Further, if the impact reducing function section is constituted by a one-way valve which opens only when the fluid inside the plunger moves to the pole core side, the flow passage area is small at the time of suction to the pole core. In addition, it can be easily configured so that the flow path area becomes large when separated from the pole core.

Further, the one-way valve is provided with an elastic partition,
Alternatively, if the one-way valve is configured by an elastic flow path, the one-way valve that operates reliably can be configured with a simple structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the contents of the present invention easier to understand, the following description will be made based on the illustrated embodiment.

[0015]

FIG. 1 is a sectional view of a solenoid valve using a solenoid according to a first embodiment of the present invention. FIG. 2 shows a state in which a plunger 4 is attracted to a pole core 3 and a state in which the plunger 4 is separated from the pole core 3. FIG. 3 is a partial cross-sectional view for explaining the operation of the impact reduction function unit 6 during each operation.
FIG. 2 is a partial perspective view illustrating a state in which a partition 9a of a one-way valve 9 disposed therein has a through hole 4a opened and closed.

As shown in FIG. 1, a solenoid A is provided on a coil 1, a yoke 2 containing the coil 1 and serving as a magnetic path of a magnetomotive force generated by energizing the coil 1, and one end in the axial direction of the coil. A pole core 3, a plunger 4, which is movably disposed on the axis in the center space in the radial direction of the coil and is attracted to the pole core 3 by energizing the coil 1, and biases the plunger 4 away from the pole core 3. And an urging member 5 which performs the operation.

An elastic valve seat packing 7 is integrally attached to the other end of the plunger 4 which is not on the pole core side. The urging force of the urging member 5 for urging the plunger 4 toward the valve 8 causes the valve 8 to rotate. Since the seat surface 8a is shut off, the valve 8 is normally closed.

In this state, when the solenoid A is energized,
Due to the magnetomotive force generated in the coil 1, a magnetic flux loop having the yoke 2, the pole core 3, and the plunger 4 as magnetic paths is formed,
The plunger 4 is attracted to the pole core 3 against the urging force of the urging member 5, and the valve seat packing 7 is moved to the seat surface 8 of the valve 8.
a, the temporary side and the secondary side of the valve 8 communicate with each other to discharge water.

Here, the inside of the plunger 4 has a through hole 4
a shock-absorbing function unit 6 constituted by a one-way valve 9 such that a partition 9a disposed at a is opened only on the pole core side.
Are arranged. As shown in FIG. 2 (a), when the plunger 4 is separated from the pole core 3 and shuts off the valve seat surface 8a, the impact reducing function unit 6 closes the partition 9a by the elastic force of the elastic body. is there. Here, FIG.
As shown in (b), when the plunger 4 is attracted to the pole core 3 by energizing the coil 1, the fluid can be replaced only at the outer peripheral portion of the plunger 4 because the partition 9a is in the closed state. The moving speed is suppressed, and the impact at the time of collision between the pole core 3 and the plunger 4 is reduced.

FIG. 2C shows a state in which the plunger 4 is further moved to complete the suction to the pole core 3 and the plunger 4 is held. The partition 9a is in a closed state due to the elastic force of the elastic body. Here, as shown in FIG. 2D, when the energization of the coil 1 is stopped and the plunger 4 is separated from the pole core 3 by the urging force of the urging member 5, a substantially closed state formed between the pole core 3 and the plunger 4 is formed. The partition 9a is opened by the differential pressure generated due to the negative pressure of the space and the inertial force of the fluid existing in the through hole 4a of the plunger 4, and the flow path area increases. As a result, the plunger 4 is quickly separated from the pole core 3 without causing a sucker phenomenon.

FIG. 4 is a sectional view of a solenoid valve using a solenoid according to a second embodiment of the present invention, and FIG.
FIGS. 6 and 7 are partial cross-sectional views illustrating the operation of the impact reduction function unit 6 during each operation of the state in which is absorbed by the pole core 3 and the state in which the element is separated from the pole core 3.
Elastic body flow path 9 of one-way valve 9 arranged in plunger 4
FIG. 3 is a partial perspective view for explaining a state where b is opened and a state where it is closed. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 4, similar to the first embodiment,
The one-way valve 9 for controlling the flow path area is provided with the plunger through hole 4a.
It is located inside. The one-way valve 9 is formed by forming a flow path using an elastic body as shown in FIGS. 6 and 7, and has the same function as the first embodiment as shown in FIG.

With this configuration, as in the first embodiment, the moving speed of the plunger 4 can be suppressed during suction, and the impact at the time of collision between the pole core 3 and the plunger 4 can be reduced. , Plunger 4
Can be quickly separated from the pole core 3.

The above description relates only to one embodiment of the present invention, and does not mean that the present invention is limited only to the above content. For example, the solenoid A need not be an electromagnetic valve for controlling the opening and closing of the fluid, but may be a solenoid in which the plunger 4 moves.
Further, in the second embodiment, the one-way valve 9 does not need to be limited to the shapes shown in FIGS. 6 and 7, and has no load due to elasticity, or has a flow passage area near zero in a reverse load state. It only needs to be formed of a bag-shaped elastic body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a solenoid valve using a solenoid having an impact reducing function unit according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view for explaining the operation of the impact reduction function unit of the first embodiment.

FIG. 3 is a partial perspective view illustrating an open / close state of an elastic partition of the one-way valve of the first embodiment.

FIG. 4 is a cross-sectional view of a solenoid valve using a solenoid having an impact reduction function unit according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view illustrating an operation of an impact reduction function unit according to a second embodiment.

FIG. 6 is a partial perspective view illustrating an open / close state of an elastic body flow path of the one-way valve of the second embodiment.

FIG. 7 is a partial perspective view illustrating an open / close state of an elastic body flow path of another example of the one-way valve of the second embodiment.

FIG. 8 is a cross-sectional view of a conventional solenoid valve using an impact reducing solenoid using an elastic cushioning material ring.

[Explanation of symbols]

A: solenoid, 1 ... coil, 2 ... yoke, 3 ... pole core, 4 ... plunger, 4a ... through hole, 5 ... urging member,
6: Impact reduction function part, 7: Valve seat packing, 8: Valve,
8a: seat surface, 9: one-way valve, 9a: partition, 9b ...
Elastic channel

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3H106 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DC17 DD03 EE20 EE33 GC11 KK06 KK09

Claims (8)

[Claims] 1. A coil, a yoke serving as a magnetic path of a magnetomotive force generated by energizing the coil and enclosing the coil, a pole core disposed on one end side in the coil axial direction, and a center space in the coil radial direction. A plunger movably disposed on the shaft and attracted to the pole core by energizing the coil, and an urging member for urging the plunger in a direction away from the pole core, wherein the plunger is attracted to the pole core Solenoid characterized by having a shock reduction function part for reducing shock. 2. The solenoid according to claim 1, wherein the impact reducing function unit functions only when the plunger is sucked by the pole core, and does not function when the plunger separates from the pole core. . 3. The solenoid according to claim 2, wherein the impact reducing function portion operates such that a flow passage area is small when suction is performed on the pole core, and the flow passage area is increased when separation is performed from the pole core. . 4. The solenoid according to claim 1, wherein the shock reduction function section is provided so as to be exchangeable for one having a different performance. 5. The solenoid according to claim 1, wherein the impact reducing function part is provided in a through hole inside the plunger. 6. The one-way valve according to claim 1, wherein the impact reducing function unit is configured to open only when the fluid inside the plunger moves toward the pole core. The solenoid as described. 7. The solenoid according to claim 6, wherein the one-way valve is formed by an elastic partition. 8. The solenoid according to claim 6, wherein the one-way valve is constituted by an elastic bag-shaped flow path.