JPH039580Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a solenoid valve used for controlling the opening and closing of fluids such as gas or liquid fuel.

(Description of Prior Art) A solenoid valve used for opening, closing, and controlling fluids such as gas is provided with a yoke and a plunger facing each other, and the end of the plunger is moved by the repulsive force or attractive force of a magnet acting between the yoke and the plunger. Conventionally, in such electromagnetic valves, in order to reduce the shock during suction and at the same time to ensure that suction is released when the valve is closed, a valve rubber is installed between the yoke and the plunger. Buffer material is provided.

A known solenoid valve has a yoke 5 as shown in FIG.
A shallow recess 5 at the upper end of the plunger 51 facing the
2, and a cushioning material 53 is fitted into the recess. However, in this conventional device, in order to securely attach the cushioning material to the plunger so that it does not come off, the fitting must be deep, which results in a thick cushioning material. If the cushioning material is thicker than necessary, it will affect the magnetic force generated between the yoke and the plunger, and in particular, the holding voltage for keeping the valve open will increase, resulting in increased power consumption and waste. Therefore, if you leave the fitting as is and make the flange thinner, it will easily break off from the base, and the pieces that fall off will get caught between the plunger and yoke, causing a change in the valve opening stroke. Become.

(Purpose of the invention) The present invention aims to eliminate such conventional drawbacks.The first purpose is to prevent the buffer member from falling off or partially tearing off at the end of the plunger facing the yoke. The purpose of the present invention is to provide a solenoid valve that can be firmly installed to prevent
The second purpose is to easily and inexpensively provide an energy-saving solenoid valve that can sufficiently perform its function even when the buffer member is made thin, lowers the holding voltage required to keep the valve open, and reduces power consumption. It's about doing.

(Structure of the invention) In order to solve the above-mentioned technical problem, the solenoid valve of the present invention has a yoke (fixed iron core) 8 and a repulsive force of magnetic force in a hollow vertical hole 5 of a bobbin case 6 in which an electromagnetic coil 7 is wound. Alternatively, a valve device is provided with a plunger 9 that slides up and down facing the yoke 8 due to suction force, and a valve rubber 10 that faces the valve port 12 at the end of the plunger so as to open and close a passage to the valve port 12. At the upper end of the plunger 9, a small head 13 made of a conical body is integrally formed under the neck of the plunger 9 through an annular cut groove 16 so as to be able to fit into the yoke 8. A thin plate stop spring made of a non-magnetic material is supported in the cut groove 16 under the head neck by contacting and supported by the shoulder 9a at the upper end of the plunger, and is opposed to the lower end peripheral edge 8a of the yoke 8 so as to come into contact with the peripheral edge 8a when attracted. A buffer member 15 consisting of the following is attached.

(Example) A preferred example of the present invention is shown below. In FIG. 1, reference numeral 1 denotes a valve case main body having a gas inlet 2 at one end and an outlet 3 at the other end, and an electromagnetic section 4 is assembled to this main body. The electromagnetic part 4 includes a bobbin case 6 having a hollow vertical hole 5, an electromagnetic coil 7 wound around the bobbin case, a yoke (fixed iron core) 8 fixed to the upper part of the hollow vertical hole 5, and a yoke (fixed core) 8 that can freely slide up and down to face the bobbin case 6. The plunger 9 is fitted into the plunger 9.

A valve rubber 10 is attached to the lower end of the plunger 9, and a valve spring 11 is applied to the rubber to make elastic contact with the valve seat 12a of the valve port 12 due to spring pressure, thereby closing and closing the valve port.

A small head 13 made of a conical body is integrally provided at the upper end of the plunger 9 so that when the plunger 9 is attracted to the corresponding yoke 8, it can fit into the conical recess 14 at the lower end of the yoke in a concave-convex manner. do.

A small head 13 at the upper end of the plunger is provided with an annular cut groove 16 under its neck, and a buffer member 15 is engaged with the cut groove 16 by forced press-fitting. Cut groove 16
When the buffer member 15 is engaged, it is supported in contact with the shoulder 9a at the upper end of the plunger, and is opposed to the lower end peripheral edge 8a of the yoke 8, so that it comes into cushioning contact with the peripheral edge 8a during suction. As shown in FIG. 2, the buffer member 15 is made of a non-magnetic material such as hard plastic and formed into a thin stop ring shape, and has an engaging protrusion 15a integrally formed on the inner edge of the ring.

(Operation and Effect) When the electromagnetic coil 7 is not energized, the plunger 9 presses the valve rubber 10 against the valve seat 12a by the repulsive magnetic force with the yoke 8 and the valve spring 11, so that the valve port 12 is closed. be.

When a current is applied to the electromagnetic coil 7, the yoke 8 is induced, and the magnetic force acts to attract the corresponding plunger 9, so that the valve rubber 10 is pulled up against the bias of the valve spring 11, and the valve seat is pulled up. 12a, the valve port 12 opens and the gas flows from the inlet port 2 through the valve port to the outlet port 3.

When the plunger 9 is attracted to the yoke 8, a shock is generated at that moment, but since the buffer member 15 is engaged with the annular groove 16 under the neck of the small head, the buffer member is attached to the lower end of the yoke 8. It abuts against the peripheral edge 8a in a cushioning manner.

This buffer member buffers excessive impact.

When opening a valve, the maximum voltage is required to open the valve, but only a small voltage is required to hold the valve open afterwards. At this time, if the buffer member 15 is thin, the voltage becomes even smaller.

FIG. 4 is a graph showing the voltage when the valve is opened and the holding voltage. According to the present invention, this holding voltage can be made much smaller than the voltage when the valve is opened.

The present invention has the above-mentioned structure, and a cut groove is provided at the upper end of the plunger, and a thin plate spring-shaped buffer member is attached to the cut groove. Although it is free, there is no risk of it accidentally coming off during use, and it can be formed thin without any problems, and the holding voltage can be reduced, so it can be used as an energy-saving solenoid valve with low power consumption. The structure is simple and can be implemented at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the solenoid valve of the present invention, Fig. 2 is a perspective view of the buffer member, Fig. 3 is a partial side view of the plunger, and Fig. 4 a and b are the electromagnetic valves according to the present invention. A graph diagram showing the valve opening voltage and holding voltage of the valve, and FIG. 5 is a sectional view of a conventional solenoid valve. 5...Hollow vertical hole, 6...Bobbin case, 7...
Electromagnetic coil, 8...Yoke, 9...Plunger,
10...Valve rubber, 11...Valve spring, 12...Valve port, 15...Buffer member, 13...Small head, 16...
...cut groove.

Claims (1)

[Scope of utility model registration request] A yoke (fixed iron core) 8 and a plunger 9 that slides up and down opposite to the yoke 8 by magnetic repulsion or attraction are provided in the hollow vertical hole 5 of the bobbin case 6 around which the electromagnetic coil 7 is wound. In this valve device, a valve rubber 10 is provided at the end of the plunger facing the valve port so as to open and close a passage to the valve port 12, and a valve rubber 10 is provided at the upper end of the plunger 9 so as to fit into the yoke 8 in a concave and convex manner. Small head consisting of a cone 1
3 is integrally formed under the neck of the small head via an annular cut groove 16, and the small head is abutted and supported by the shoulder part 9a of the upper end of the plunger in the cut groove 16 below the neck, and the lower end peripheral edge of the yoke 8 8a. A solenoid valve characterized in that a buffer member 15 made of a non-magnetic thin plate stop ring is attached to face the peripheral edge 8a so as to contact the peripheral edge 8a when attracted.