JPS6030881A - Delay working solenoid valve - Google Patents

Abstract

PURPOSE:To let valve opening force act on a valve body at a constant delay, by inserting a constant distance slidable magnetic material into the inside of a plunger of a nonmagnetic material in the axial direction. CONSTITUTION:Forming a plunger 11 into a hollow body of plastic 7, a valve body 1 is jointly installed in its top end, and the specified amount of a magnetic fluid 4 is housed inside the plunger 11. In a state of valve closing, the magneltic fluid 4 inside the plunger is situated in a lowermost position of its transfer range. When an electric current is impressed on a coil 3, the plunger slowly transfers by means of fluidic resistance of the magnetic fluid 4 inside the plunger 11. Next, on and after a point of time that the magnetic fluid reaches to an upper limit position inside the plunger 11, the latter transfers solidly together with the magnetic fluid as one body, thus valve opening takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid valve, particularly a solenoid valve in which 11 of the solenoid valves are delayed in operation.

Japanese Patent Publication No. 58-15661 discloses a persimmon electromagnet with a granger (11) as shown in FIG. A spring (J'ZIK) is biased 4 times in the closing direction, and is connected to the granger, and the valve opening +21'f!: A claw that is biased by the spring round trap to the subshaft (13) passing through the valve. Plate Q51- is provided.

Here, nail plate 0! In i), the upper limit position is set constant and it is possible to slide below it, and the set load of one spring 021 is sufficiently small and the other spring (1
The biasing force of 41 is set to be large so that it almost matches the valve opening force generated when the Granger (11) opens.

In the above conventional device, when the ffl'l valve is operated, the lower spring 0 acts as a brake against the valve opening force of the plunger (1j), so the claw plate t+51 comes into contact with the lower end of the valve port (2). The opening degree in the initial valve opening state is constant, and after that, the td current value applied to the coil (3) is increased to increase the valve body (1).
) The valve is gradually opened further.

However, with the above conventional valve, it is necessary to change the current value applied to the coil in order to reduce the degree of opening in the initial valve opening state, and the above operation cannot be obtained if the current applied to the coil is constant. .

In a lift valve, the opening degree change is greatest during the initial valve opening, and this is probably because at this time, the magnetic force generated in the coil acts directly on the granger, causing the valve body to open rapidly.

The present invention opens the valve body in two stages when the current applied to the coil is constant, so the valve opening force due to the magnetic force generated in the coil does not act directly on the valve body, and the valve body is opened with a certain delay. The objective is to make this +1141r- force act on the valve body.

The technical means of unexploded QIJ to solve the above problems are:
The plunger that connects the valve body is made of a non-magnetic material, and a magnetic material that can freely swing in the axial direction is inserted into the plunger, thereby regulating the movement range to a constant Vζ.

According to the above technical means of the present invention, the following effects can be obtained.

In the closed state, the ferrofluid in the plunger is at the bottom of the range of motion of the plunger. Next, when a current is applied to the coil, only the magnetic body within the granger is moved upwardly in the valve opening direction by the magnetic force. This force causes the valve body to open slightly, and then, after the magnetic body reaches the upper limit position within the plunger, the granger moves together with the magnetic body to open the valve.

Since the present invention has the above configuration, it has the following unique effects.

Since the valve element moves slowly in the initial stage of opening, accidents caused by sudden opening fF can be prevented.

Since it does not change the current value applied to the coil, no control means is required for this purpose, and the structure can be simplified compared to a type in which the current applied to the coil is gradually changed.

Hereinafter, an embodiment of the "Zero Hatsu" will be explained based on the drawings.

In the embodiment shown in FIG. 2, the pusher (11) is made of a plastic hollow body, and a valve body (1) is connected to the tip of the pusher (11). A spring (151) is provided for the brush jar (151).
1) contains a predetermined amount J)1 (an amount that does not fill up) of magnetic fluid (4).

In this case, when a current is applied to the coil (3), the valve body (1)
A force for moving the valve body is applied by the magnetic force in the transmission path from the magnetic Il'JJfiL body (4) to Granger 01).

At the beginning of the movement of the valve body, the granger, that is, the valve body (1), moves slowly due to flow resistance within the pusher (11) of the magnetic fluid +4.

Next, in the case of the embodiment shown in Fig. 3, an iron rod (5) is used as the magnetic body, and this is slid into the plunger (11) formed in the same manner as in the case of the first embodiment. It is freely accommodated.

In this case as well, the operation is similar to that of the first embodiment.

In any of the embodiments described in 1., if the diameter of the valve port (2) is increased, the flow path can be opened almost fully by initial valve opening. Therefore, in this case, it can be used as a solenoid valve for slow ignition of gas appliances, similar to the conventional example described above.

Since the valve opens slowly until it reaches full opening, the explosive ignition that could result from opening the valve is eliminated.

In the case of the first embodiment shown in FIG. 2, if a resistance imparting member +411' such as a net is provided in the plunger (11), the upward force of the magnetic fluid (4) can be efficiently applied to the plunger. 01).

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is an explanatory diagram of a first embodiment of the present invention, and Fig. 3 is an explanatory diagram of a second embodiment. Valve body (2)... Valve port (3
)... Coil (4)... Magnetic fluid (
5)...Hirobar representative Patent attorney Hiroshi Saka Figure 2 Figure 1

Claims (1)

[Claims] In a solenoid valve in which the magnetic force generated in the excitation coil applies 4Tr force f=J to the plunger to fully open the valve body,
J for 11 bodies! I! The grunger to be installed is made of a non-magnetic material, and a magnetic material that is movable in the axial direction is inserted into the plunger, and the movement J*' (z) is regulated to be constant.