JPH0132724Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solenoid for an electromagnetic valve that moves a spool of a valve device to switch, open and close a fluid flow path.

Generally, a solenoid for a solenoid valve has a stopper made of an elastic material such as rubber that buffers and stops the retreat of the plunger. There was a problem that caused the plunger to flutter.

In order to solve this problem, for example,
If a stopper known from Japanese Patent No. 125066, which is formed into a bellows structure with small ventilation holes to obtain an air damper effect, is used as the stopper,
When the plunger moves forward after the stopper is compressed by the retreat of the plunger, air can only gradually enter the stopper with the bellows structure through the small ventilation holes mentioned above, and it takes a long time for the stopper to recover. . For this reason, when the plunger repeatedly operates at high speed, the retreated plunger collides with the stopper before the stopper is restored, resulting in a problem that the above-mentioned buffer stop cannot be achieved. In order to solve this problem, if the vent hole is made larger, the air inside the stopper will quickly escape through the large vent hole when the plunger retreats, and the function of buffering and stopping the plunger's retreat will disappear. There is a problem with this.

Further, since the stopper compresses the air in the hollow part to exhibit a buffering effect, it is desirable that the hollow part is large. However, if the hollow portion is made larger, there will be problems such as there will be no space for the push pin and the housing will become larger.

Therefore, the purpose of the present invention is to eliminate the above-mentioned problems of the prior art, and to provide a solenoid for an electromagnetic valve whose hollow part can be made bulky so as to absorb a large impact when the plunger retreats. In addition, it is possible to prevent the plunger from flapping, and even when the plunger moves repeatedly at high speed, the stopper can be quickly restored, which absorbs the impact and prevents flapping when the plunger retreats next time. It is an object of the present invention to provide a solenoid for an electromagnetic valve which has a structure in which this can be achieved and the push pin can be easily disposed.

The drawings showing the embodiments of the present application will be described below. In FIG. 1, 1 is a valve device and 2 is a solenoid. In the valve device 1, a valve body 3 has a port serving as a fluid flow path. 4 is a spool that can move forward and backward in the direction of the arrow. Reference numeral 5 is connected to the spool 4 by a valve pin for transmitting external force to the spool 4. Next, in the solenoid 2, 6 is a bottom cover, and 7 is a gasket, which is made of a ring-shaped elastic material such as rubber. Reference numeral 8 denotes a cushion made of an elastic material such as rubber, which is used to buffer and push up and fix the frame 10, which will be described later. 9 is a housing made of a non-magnetic material with good thermal conductivity such as aluminum. A fixed iron core 10 is mainly made of silicon steel plate. 10a indicates the suction surface of the fixed core 10. 11 is a coil. 12
is a plunger guide. Reference numeral 13 denotes a stopper having a hollow portion 13b constituting an air chamber, which is manufactured using an elastic material such as rubber, and has a bellows structure portion 13a as shown in FIG. 13c is a bonded portion, and 13d is a plunger contact surface. 13e is the plunger contact surface 13d (the part surrounded by the two-dot chain line 13g)
The part of the ventilation hole that the plunger begins to hit is blocked by the plunger and becomes sealed, and as the internal pressure increases, air leaks from this ventilation hole to the outside, causing the effects described later. It is becoming possible to obtain This effect of the hole can also be made possible by forming an uneven portion on the opposing surface of the adhesive portion 13c so that an air leakage gap can be formed on the opposing surface. 14 is a plunger, as is well known, and is manufactured by laminating a plurality of silicon steel plates with their mating surfaces parallel to the direction of advancement and retreat of the plunger, and integrating them with rivets, so that the plunger can move forward and backward in the direction of the arrow. It's summery. 14a is plunger 14
The figure shows the suction surface in . Reference numeral 15 is provided so that the plunger 14 can be manually operated with a push pin, and the spool 4 can also be operated via the valve pin 5. Components that are mounted symmetrically in FIG. 1 are designated with a dash ['] and their explanation will be omitted.
Reference numeral 16 in FIG. 3 is a conventional stopper, which is made of an elastic material such as rubber.

Next, before explaining the actual operation of the plungers 14, 14' in the solenoids 2, 2' shown in FIG. 1 using FIG. 5, it will be noted that only the structure of the stopper is different from that in FIG. 1. configuration, i.e. the third
The operation of the plunger when the conventional stopper 16 shown in the figure is used will be explained with reference to FIG. In FIG. 4, the horizontal axis is time and the vertical axis is a graph of displacement, which shows a partial state during continuous switching operation. Here, A and B indicate the respective operations of two opposing solenoids. A is the point when the coil is energized and the plunger starts moving, and B is the moment when the plunger is attracted to the fixed iron core. C is a point where the plunger, once attracted, is forcibly pushed away by the collision force via the valve pin and spool of the opposing plunger. D
is the point where it is adsorbed again, and at this time a flapping sound is generated. After that, the adsorption state continued, and point E is the point where the current was stopped and the plunger started to return, and point F is the point where it collided with the stopper and rebounded. G is the point where the repulsed plunger collided with the valve pin, H is the point where the opposing coil was energized and collided via the valve pin and spool due to the suction action of the opposing plunger.
Plunger movement is accelerated. I is the point where it collided with the stopper again and rebounded, and J is the point where it collided with the valve pin. At this time, the opposing plungers that were in the suction state are forcibly separated. At K, it collides with the stopper again and rebounds, but it stops at L point.
The above is the operation of one cycle of the plunger on one side, and the operation of the opposite plunger is similar, so the reference numeral is an alphanumeric character with a dash ['] added thereto and the explanation thereof will be omitted.

On the other hand, Fig. 5 shows the operation of the plunger when the stopper 13 of Fig. 1 is used in contrast with the same idea as Fig. 4, and M is the point when the coil is energized and the plunger starts operating. , N is the moment when the plunger adsorbs to the fixed iron core, O is the point when the current is stopped and the plunger starts to return, P is the point when it collides with the stopper and its energy is absorbed, and Q is the point when the plunger stops completely. Put it away. Incidentally, since the operation of the opposing plunger is also similar, the reference numeral is an alphanumeric character with a dash ['] added thereto, and the explanation thereof will be omitted.
As can be seen from the explanations in Figures 4 and 5,
In a conventional solenoid using a stopper, there is a phenomenon in which the solenoid is pulled apart instantaneously after adsorption, that is, it flutters, and the valve pin and stopper move back and forth several times after the plunger returns. In the solenoid using the stopper 13 shown in FIG. 1, it is possible to eliminate not only the fluttering after suction but also the reciprocating movement after the plunger returns.

As described above, in the present invention, inside the housing 9,
The valve device 1 is provided with a coil 11 and a plunger 14 for operating the spool, which moves forward and backward depending on whether or not the coil 11 is energized. In a solenoid for an electromagnetic valve in which a push pin 15 for manual forward movement with a plunger 14 is arranged to move forward and backward, an elastic material is provided between the rear end surface of the plunger 14 and the front end surface of the push pin 15. A plunger abutting portion 1d of the stopper 13 formed in the shape of a hollow box is provided, and the rear end opening edge of the stopper 13 is attached to the adhesive portion to the housing 9 while being located around the push pin 15. 13c, and the side wall between the periphery of the plunger contacting part 13d and the adhesive part 13c changes in size as the plunger contacting part 13d advances and retreats in response to the advance and retreat of the plunger 14. The bellows structure 13a is configured to enable the plunger to return to its forward direction, and the plunger abutting portion 13d of the stopper 13 is provided with a vent hole 13 for air inflow communicating with the hollow portion 13b.
Since the solenoid for the electromagnetic valve is configured with a hole e, there are the following three effects.

The first point is that when the plunger 14 retreats, even if the vent hole 13e is large and a large amount of air can flow in and out from it, the plunger 14 that retreats blocks the vent hole 13e and the air chamber is closed. This has the effect of receiving the plunger 14 in a state where air leaks out only little by little, and absorbing the impact.

As a second point, when the plunger 14 moves forward, the plunger 14 that was blocking the ventilation hole 13e
When the large vent hole 13e is opened as a result of the progress, air can rapidly flow into the air chamber through the large vent hole 13e, and the stopper 13 has the advantage of being able to return to its original state at an extremely high speed using its own elastic force. This means that even when the plunger 14 repeatedly operates at high speed, the air chambers are inflated each time the plunger 14 retreats, which is useful for absorbing the impact and preventing flapping.

As a third point, the plunger abutting part 13d of the stopper 13 is located between the plunger 14 and the push pin 15, and the adhesive part 13c is located around the push pin 15, so that the hollow part 1
It has the advantage of making 3b extremely bulky and increasing the buffering effect.

As a fourth point, even if the hollow part 13b is enlarged so that it fills inside the casing as shown in FIG.
When pushing the push pin 15 to the left,
Due to the presence of the bellows structure 13a configured for restoring the plunger contact portion 13d, there is a feature that the plunger contact portion 13d can be easily moved to the left by utilizing its extensibility. This has a volumetric effect that allows the large stopper 13 and the pushing space of the push pin 15 to coexist (coexist in a state in which the same space is used) in the small housing 9. effective.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a partially cutaway perspective view, Fig. 3 is a partial sectional view showing a conventional example, and Figs. 4 and 5 show a plunger. FIG. 4 shows a conventional example, and FIG. 5 shows an embodiment of the present invention. 1... Valve device, 5... Valve pin, 14... Plunger, 13... Stopper.

Claims (1)

[Scope of utility model registration request] Inside the housing 9 are a coil 11 and a coil 1.
The valve device 1 is provided with a plunger 14 for operating the spool, which moves forward or backward depending on the presence or absence of electricity to the valve device 1. Furthermore, a plunger 14 is provided at a position facing the rear end surface of the plunger 14 in the housing 9 so that the plunger 14 can be manually operated. In a solenoid for a solenoid valve in which a push pin 15 for forward operation is arranged to move forward and backward, a hollow box with a U-shaped cross section made of an elastic material is provided between the rear end surface of the plunger 14 and the front end surface of the push pin 15. Stopper 1 formed in the shape of
3, and the rear end opening edge of the stopper 13 is positioned around the push pin 15 when the housing 9 is disposed.
Furthermore, the side wall between the periphery of the plunger contacting part 13d and the adhesive part 13c is such that the plunger contacting part 13d advances and retreats in response to the advance and retreat of the plunger 14, and the inner hollow part 13b is formed. The bellows structure 13a allows the plunger to be restored in the forward direction so as to change in size.Moreover, the plunger abutting portion 13d of the stopper 13 has a vent hole 13e for air inflow communicating with the hollow portion 13b. A solenoid for a solenoid valve is provided.