JPH06241341A - Solenoid valve - Google Patents

Abstract

PURPOSE:To shut-off a valve and to stepwise control the flow rate at more than two stages with the use of a single coil by forming a second valve port formed of an orifice hole communicated to a main valve port, in a main valve element, and by arranging a second valve element integrally incorporated with a plunger, in series to the main valve, so that the second valve element is opposed to the second valve port. CONSTITUTION:When a coil 1 is energized, a yoke 2 is energized so as to effect an attracting force between the yoke 2 and a plunger 4. When the attracting force exceeds an urging force of a spring 13, the plunger 4 is moved upward, compressing the spring 13. By the way, when the plunger 4 is elevated by a predetermined float-up distance S, a second valve port 7 is opened. Accordingly, gas flows out from a gas outlet port 16, after flowing from a valve chamber 11 through the second valve port 7 and a through-hole 17 in a main valve element 6. Meanwhile, if the current applied to the coil 1 is increased, the attraction force is increased so as to lift the plunger 4. Accordingly, the main valve element 6 is lifted up by means of a locking piece 9, overcoming a spring 14 so that a main valve port 5 is opened. As a result, gas flows out from the main port 5 so as to increase the flow rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve that controls the flow rate of a gas or other fluid and closes it by electromagnetic force.

[0002]

2. Description of the Related Art A valve plate for opening and closing a valve opening is attached to the lower end of a plunger (movable iron core) facing a yoke (fixed iron core), and the plunger is moved up and down by electromagnetic force to control the flow rate. And the solenoid valve that is designed to be closed
No. 61-202771, No. 57-10707
It is generally known in Japanese Patent Publication No. 4 and the like.

[0003]

Such a conventional solenoid valve opens and closes a single valve consisting of one yoke for one coil, a plunger and a valve plate. Therefore, when the flow rate is controlled stepwise or closed by using such a single valve, a plurality of solenoid valves are provided in parallel and each solenoid valve is operated individually as shown in FIG. Since it is necessary, there are problems that the number of solenoid valves increases, the space also increases, the power consumption increases, and the product cost increases.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a flow coil roll having two stages or two or more stages with one coil. In addition, it is inexpensive and small, and also has a closing function.
Moreover, it is intended to provide an energy-saving type solenoid valve with low power consumption.

[0005]

To achieve the above object, a solenoid valve according to the present invention includes a yoke (fixed iron core) 2 fixed at one end so as to be excited by a coil 1.
A plunger (movable iron core) 4 that slides in the axial direction of the plunger guide 3 facing the yoke, and a shaft center at the end of the plunger so that the main valve port 5 is opened and closed by sliding of the plunger. In a solenoid valve including a main valve body 6 provided with a floating distance in the direction.
A second valve port 7 consisting of an orifice hole to the main valve port 5 is opened at the same time, and at least integrally with the plunger so as to open and close the second valve port by sliding of the plunger facing the second valve port. One or more second valve bodies 8 are provided in series with the main valve body.

Then, the plunger 4 and the main valve body 6
The springs 13 and 14 are individually biased in the valve closing direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, the yoke (fixed iron core) 2 is
The coil 1 is fixed by caulking or the like integrally with the upper case 10 so as to close the upper end opening of the hollow vertical hole of the cylindrical portion of the bobbin case.

The plunger (movable iron core) 4, which is formed in a cylindrical shape, is fitted in the plunger guide 3 from the bottom so that the lower end portion faces the inside of the valve chamber 11, and is vertically slidable. A spring 13 is biased between the yoke 2 and the yoke 2 so as to separate from the yoke 2 when energized.

The case body 12 has a gas inlet 15 and a gas outlet 16 and has a valve chamber 11 formed therein. The lower end of the plunger 4 faces the valve chamber 11, and a combination of the main valve body 6 and the second valve body 8 is attached to the lower end.

A main valve body 6 and a second valve body 8 are provided at the lower end of the plunger 4 via a shaft ∂4a. The second valve body 8 is formed integrally with the shaft ∂4a at the lower end of the plunger, but the main valve body 6
Is formed separately from the plunger 4, and is attached to the plunger with a floating distance S in the vertical (axial length) direction. Therefore, the main valve body 6 is provided with a locking piece 9 for the plunger, and the floating piece S is secured by engaging the locking piece 9 with the second valve body 8 at the lower end of the plunger.
The main valve body 6 is provided with a valve spring 14 that biases the main valve body in the valve closing direction.

The main valve opening 5 and the second valve opening 7, and the main valve body 6 and the second valve body 8 corresponding to these respective valve openings are provided in series at positions that coincide with the axial center of the plunger 4.

[0013]

When the coil 1 is in the non-energized state, the yoke 2 is not excited and the attraction force does not act, so that the main valve body 6 and the second valve body 8 are biased by the springs 13 and 14 as shown in FIG. Due to this, the valve ports 7 and 5 are closed and the gas is stopped.

In the solenoid valve described above, when a current is applied to the coil 1 and gradually increased, the yoke 2 is excited and an attractive force acts between the yoke 2 and the plunger 4. When the suction force exceeds the pressing force of the spring 13 biased between the yoke 2 and the plunger 4, the plunger 4 compresses the spring 13 and moves upward. The amount of movement at this time is within the range of the floating distance S between the main valve body 6 and the second valve body 8.

When the plunger 4 rises by the floating distance S,
The second valve opening 7 opens. Therefore, the gas flows from the valve chamber 11 through the second valve port 7 through the through hole 17 of the main valve body 6 to the gas outlet 16. Therefore, the gas flow rate at this time is the regulation flow rate regulated by the orifice hole of the second valve opening 7 because only the second valve body 8 is opened.

When the current applied to the coil 1 is further increased, the attraction force becomes stronger than the above, and the plunger 4 moves further upward. For this reason, the main valve body 6 is pulled upward by the engagement of the locking piece 9 and moves upward against the bias of the valve spring 14, so that the main valve opening 5 opens. Therefore, since the gas also flows out from the main valve port 5, the gas flow rate becomes larger than the above.

When the current applied to the coil 1 is cut off, the excitation of the yoke 2 disappears and the attraction force of the plunger 4 also becomes zero. Therefore, the return elasticity of the springs 13 and 14 returns it to its original position and returns to the main valve body 6 and the second valve. The valve bodies 8 close the respective valve openings 5 and 7 again and the gas is completely shut off.

[0018]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to close the valve with one coil and to control the flow rate in stages of two or more stages, and to use a single valve as in the prior art. There is no need for means for individually operating in multiple stages. Therefore, it is possible to easily provide a solenoid valve for flow rate control that is lightweight, small in size, consumes less power, and is advantageous in cost. Further, since there is only one fluid passage, no complicated passage is required, the piping is simple, the probability of fluid leakage is reduced, and safety can be improved.

[Brief description of drawings]

FIG. 1 is a piping diagram when performing stepwise control of a flow rate using a conventional solenoid valve.

FIG. 2 is a vertical sectional front view of the solenoid valve of the present invention.

FIG. 3 is a cross-sectional view of a valve body structure portion when the flow rate of the solenoid valve of the present invention is limited.

FIG. 4 is a cross-sectional view of a valve body structure portion when the solenoid valve of the present invention is at a fully open flow rate.

[Explanation of symbols]

 1 coil 2 yoke (fixed iron core) 4 plunger (movable iron core) 5 main valve opening 6 main valve body 7 second valve opening 8 second valve body 9 locking piece 13/14 spring S floating distance

Claims (1)

[Claims] 1. A yoke (fixed iron core) 2 fixed at one end so as to be excited by a coil 1, and a plunger (movable iron core) that slides in a plunger guide 3 in the axial direction facing the yoke. ) 4 and a main valve body 6 provided at the end of the plunger with a play distance in the axial direction so that the main valve opening 5 is opened and closed by the sliding motion of the plunger. The valve body 6 is provided with a second valve opening 7 consisting of an orifice hole to the main valve opening 5, and a plunger is arranged so as to oppose the second valve opening and open and close the second valve opening by sliding of the plunger. An electromagnetic valve, wherein at least one or a plurality of second valve bodies 8 are integrally provided in series with a main valve body.