JPS6246056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a variable flow rate solenoid valve that varies the flow rate in proportion to the excitation current of an excitation coil.

Conventionally, in a variable flow rate solenoid valve driven by an electromagnetic solenoid, the valve body and the electromagnetic solenoid body are generally separate bodies, and when the two are assembled together with screws etc., the electromagnetic solenoid It is difficult to match the bobbin center with the center of the valve hole for reciprocating the movable valve in the valve body. Therefore, when the plunger 1 and the movable valve 2 are integrally formed as shown in FIG. However, in this case, the efficiency of the electromagnetic solenoid 4 will be considerably reduced, and as shown in FIG. If formed separately, it is necessary to press the movable valve 6 against the end surface of the plunger 5 via a spring 8 that is different from the spring 7 for biasing the plunger 5 in the opposite suction direction, but in this case, both springs 7 , 8 was difficult to balance.

The purpose of the present invention is to provide a variable flow rate solenoid valve that can maintain or improve the accuracy of flow rate control and the efficiency of an electromagnetic solenoid while having a simple structure, easy assembly, and low production costs. The object is to eliminate the above-mentioned conventional drawbacks.

Next, the configuration of the first embodiment of the present invention is shown in Figures 3 to 5.
This will be explained using figures.

A guide cylinder 15 is attached to the bobbin 14 of the electromagnetic solenoid 13, which is tightly fixed to the valve body 11 with a fluid inlet 9 and an outlet 10 via a presser plate 12.
is installed in a state where the fluid flow passage 17 inside the valve body 11 is kept airtight via an O-ring 16,
A fixed iron core 19 attached to a yoke-cum-case 18 that forms a magnetic path is inserted into the guide tube 15 through an O-ring 20 while maintaining an airtight state inside the guide tube 15, and a plunger 21 is also inserted into the guide tube 15. is inserted so that it can move back and forth.

Further, the cylindrical movable valve 23, which is reciprocatably inserted into the valve hole 22 formed in the middle of the fluid flow passage 17 of the valve body 11, is inserted into the groove 24 formed at the tip of the plunger 21 from the outer periphery of the movable valve 23. The rivet-like retaining pin 26 inserted through the retaining pin 25 and the ring 27 for preventing the pin 26 from falling out prevent relative movement on the axis, and are radially aligned in accordance with the amount of gap between the bottom surface of the groove 24 and the tip of the retaining pin 26. The plunger 21 is mounted so that it can be moved relative to the direction, and the plunger 21 has the same tip and a movable valve 23 at the tip.
A rubber seal 28 is installed to prevent fluid flow between the inside and the bottom surface of the electromagnetic solenoid 13 and a stop pin 26, which biases the plunger 21 in the anti-suction direction as shown in FIG. A conical spring 29 having spring characteristics is attached to the cylindrical movable valve 23, and the fluid flow path 17 is
Elongated hole 30 that changes the effective flow area of the fluid on the top
is formed.

In the case of the variable flow rate solenoid valve 31 formed in this way, the plunger 21 and the movable valve 23 move relative to each other in the radial direction in accordance with the amount of gap between the bottom surface of the groove 24 and the tip of the bottle 26. 13 in the installed state, even if the axial center of the guide tube 15 and the axial center of the valve hole 22 do not coincide, the movement of the plunger 21 and the movable valve 23 will be approximately the same as when the axes of the guide tube 15 and the valve hole 22 coincide. The same smoothness is maintained, and since the spring 29 is a spiral spring and the spring characteristics of the spring 29 almost match the attraction characteristics of the plunger 21, the movable valve along with the plunger 21 is Solenoid valve 31 by moving 23
This has the effect of being able to vary the flow rate of fluid passing through with high precision and in a stable state.

Next, FIGS. 6 and 7 show a second embodiment of the present invention, in which a locking portion 33 formed on a spiral spring 32 is connected to a notch 3 formed on a movable valve 34.
5 into the groove 37 of the plunger 36,
The structure, operation, and effect of this embodiment are substantially the same as those of the first embodiment, except that the movable valve 34 and the plunger 36 are connected so as to be movable relative to each other.

Next, the effects of the present invention will be explained.

The present invention consists of a movable valve that reciprocates across the fluid flow path of the valve body communicating with the fluid inlet and outlet to vary the flow rate of fluid passing through the valve body, and an electromagnetic solenoid attached to the valve body. A plunger is connected to the plunger so as to be relatively movable in the radial direction, and a spring characteristic is changed in accordance with the attraction force characteristics of the plunger between the movable valve and the electromagnetic solenoid in order to bias the plunger in the direction of the opposite attraction force. The variable flow rate electromagnetic valve is provided with a conical spring that allows the position of the plunger to be controlled over substantially the entire stroke range of the plunger by changing the excitation current of the electromagnetic solenoid.

As a result, the present invention allows the movement of the plunger and the movable valve even if the axes of the guide tube of the electromagnetic solenoid into which the plunger is movably inserted and the valve hole in which the movable valve is movably inserted are not aligned. In a smooth state, the plunger position control range by changing the excitation current of the electromagnetic solenoid is greatly increased, and the flow rate control range by the variable flow rate solenoid valve is greatly increased. The variable flow rate solenoid valve, which can vary the flow rate of fluid in a highly accurate and stable manner, has a simple structure and is easy to assemble, thereby significantly reducing production costs.

[Brief explanation of the drawing]

Figures 1 and 2 are cutaway front views of the conventional embodiment;
3 and 4 are cutaway front views of the first embodiment of the present invention, FIG. 5 is its operation diagram, FIG. 6 is a cutaway front view of essential parts of the second embodiment of the present invention, and FIG. 7 is A in Figure 6.
-A sectional view. 9... Inflow port, 10... Outlet port, 11... Valve body, 13... Electromagnetic solenoid, 17... Fluid flow path, 21, 36... Plunger, 22... Valve hole,
23, 34...Movable valve, 24, 37...Groove, 25
...hole, 26 ... retaining pin, 27 ... ring, 2
9, 32... Spring, 30... Long hole, 31...
...variable flow rate solenoid valve, 33...locking part.

Claims (1)

[Scope of utility model registration request] A movable valve that reciprocates across a fluid flow path of a valve body communicating with a fluid inlet and an outlet to vary the flow rate of fluid passing through the valve body, and a plunger of an electromagnetic solenoid attached to the valve body. The movable valve and the electromagnetic solenoid are connected to each other so as to be relatively movable in the radial direction, and the electromagnetic solenoid is connected between the movable valve and the electromagnetic solenoid so as to be able to move relative to each other in the radial direction, and whose spring characteristics are changed in accordance with the attraction force characteristics of the plunger. 1. A variable flow rate solenoid valve, characterized in that a conical spring is attached to the plunger so that the position of the plunger can be controlled by changing the excitation current over substantially the entire stroke range of the plunger.