JPH0552445U - Solenoid valve structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the power consumption of the solenoid and prevent fluid leakage. [Structure] The step provided on the tip of the plunger 2 is engaged with the step of the joint 11, and the step provided on the valve body 5 is the joint 1.
It is designed to lock with the step of 1. The spherical surface 2 a at the tip of the plunger 2 contacts the upper surface of the valve body 5. A compression coil spring 12 is arranged between the joint 11 and the plunger 2.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a solenoid valve, and more particularly to a solenoid valve structure in which a solenoid current required for opening a valve is reduced and a valve body is closely attached to a valve seat without a gap.

[0002]

[Prior Art]

 An example of the structure of a conventional solenoid valve is shown in FIGS. 4 (a) and 4 (b). In FIG. 4A, reference numeral 1 denotes a yoke, which forms a magnetic path with the plunger 2, and a solenoid 3 having a coil wound coaxially with the plunger is arranged.

A pipe 6 is arranged so as to isolate a fluid passage formed in the body 4 from the outside, a gap between the pipe 6 and the yoke 1 is closed by an O-ring 7, and a gap between the pipe 6 and the body 4 is O. It is closed by a ring 8.

The plunger 2 is guided by a pipe 6 to be vertically movable, and is urged downward by a compression coil spring 9. The elastic valve body 5 fitted in the plunger 2 closes the fluid passage of the valve seat 4a provided in the body 4 when the plunger 2 moves downward. The fluid flows in through the inlet of the body 4 and flows out through the opening of the valve sheet 4a as shown by the arrow in the figure.

In the solenoid valve shown in FIG. 4B, the tip of the plunger 2 is formed into a conical shape to form a valve body 2 a, and a valve seat 10 separate from the body 4 is press-fitted into the body 4.

In such an electromagnetic valve structure, when the solenoid 3 is not energized, the valve body is pressed against the valve seat by the elasticity of the coil spring 9 to close the fluid flow path, as shown in the figure. When the solenoid 3 is energized, the plunger 2 is attracted by the magnetic flux and moves upward, and the valve seat opens the fluid flow path.

However, when the valve seat opens the fluid flow path, the pressure of the fluid acts to impede the movement of the plunger, and a large force must be applied to the plunger. At that time, the distance between the yoke 1 and the plunger 2 is increased. Is the maximum δ ₁ .

As described above, when the distance between the yoke 1 and the plunger 2 is large, it is necessary to flow a large current through the solenoid in order to obtain a large attractive force due to the magnetic flux, resulting in a large power consumption. Alternatively, it is necessary to increase the number of turns of the coil, which has a disadvantage of increasing the size.

Further, when the yoke 1 and the pipe 6 and the body 4 are mounted in a tilted manner, the valve body integrated with the plunger 2 tilts with respect to the valve seat, and as shown in FIG. 5, the valve body 5 and the valve seat are There is a problem that a fluid leaks due to a gap formed between the fluid and the fluid 4a.

FIG. 6 shows a structure of a solenoid valve proposed in Japanese Patent Laid-Open No. 1-145484 in order to solve the above-mentioned drawback of increasing power consumption. In this solenoid valve, the elastic valve body 5 is fitted on the valve rod 5a, the valve rod 5a is attached so as to slide in the axial direction with respect to the plunger 2, and the compression coil spring 12 is attached to the plunger 2 and the valve rod. It is arranged between 5a. The other structure is similar to that shown in FIG. 4, and the corresponding parts are designated by the same reference numerals.

FIG. 6A shows a state in which no current is flowing in the solenoid 3, and the plunger 2 is pushed downward by the elastic force of the compression coil spring 9 to push the upper surface of the valve rod and the valve body 5 , The fluid passage is closed.

When a current is applied to the solenoid 3, the plunger 2 is attracted upward against the elastic force of the compression coil spring 9, but the valve body 5 is pressed against the valve seat due to the fluid pressure and does not move. 12 are compressed. The state is shown in FIG.

In FIG. 6B, the compression coil spring 12 increases in elasticity, or when the compression coil spring 12 is fully compressed and the elasticity in the compression direction is lost, the valve body and the plunger are locked and the valve body 5 is fluidized. Fig. 6 (c) shows the state immediately before lifting against the pressure of the valve. It is lifted by 12 and the valve is fully opened.

With this solenoid valve, the valve opening operation is not performed when the plunger is separated from the yoke by the maximum distance, and therefore the power consumption can be reduced. However, the elastic force of the compression coil spring separates the valve body 5 from the valve seat against the pressure of the fluid, and it is necessary to increase the elastic force. The plunger had to be attracted against the large elasticity of this coil spring, and the power consumption could not be reduced sufficiently.

If the compression coil spring 12 is fully compressed and the elastic force in the compression direction is lost so that the valve body and the plunger are locked, it is necessary to increase the elastic force of the compression coil spring. However, since the compression coil spring is used in the fully compressed state, there is a problem that durability is deteriorated.

Further, since the flat surface of the plunger pushes the flat surface of the valve rod, the inclination of the plunger is transmitted to the valve rod as it is, and the problem of the fluid leakage is not solved.

[0017]

[Problems to be solved by the device]

 The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure of a solenoid valve in which fluid leakage is prevented and power consumption is reduced.

[0018]

[Means for Solving the Problems]

 The structure of the solenoid valve of the present invention is such that the step between the plunger that is reciprocally driven by turning the solenoid current on and off and the valve body that opens and closes the fluid passage of the valve seat are locked to the step of the joint to form the plunger and the valve body. Is coupled with play in the pulling direction, a compression coil spring is interposed between the plunger and the joint, and the upper surface of the valve seat is pressed by the convex surface provided at the tip of the plunger.

[0019]

[Action]

 According to the solenoid valve of this invention, since the plunger pushes the valve body with the convex surface, the inclination of the plunger is not transmitted to the valve body, and the valve body is completely brought into close contact with the valve seat, so that fluid leakage is prevented. ..

Further, since the plunger and the valve body are connected with play, and when the valve is opened to generate the maximum drag force due to the pressure of the fluid, the plunger approaches the yoke and the attraction force of the magnetic flux increases by the amount of the play. The power consumption of the solenoid can be reduced.

Further, the compression coil spring interposed between the plunger and the joint need only be lifted after the valve is opened, and the elastic force can be reduced, so that it is required depending on the elastic force. Power consumption is low.

[0022]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a sectional view showing the structure of a solenoid valve according to an embodiment of the present invention. As shown in the figure, the step provided on the front end of the plunger 2 is engaged with the step of the joint 11, and the step provided on the valve body 5 is engaged with the step of the joint 11. ..

The spherical surface 2 a at the tip of the plunger 2 contacts the upper surface of the valve body 5. A compression coil spring 12 is arranged between the joint 11 and the plunger 2. Other configurations are similar to those shown in FIG. 4, and corresponding parts are designated by the same reference numerals.

The figure shows a state in which no current is flowing through the solenoid 3, the plunger 2 is moving downward due to the elastic force of the compression coil spring 9, and the valve body 5 is pushed by the spherical surface 2 a of the plunger 2 to cause the valve to move. It is pressed against the sheet 4a. At this time, the distance between the yoke 1 and the plunger 2 is δ ₁ , and the distance between the step of the joint 11 and the step of the plunger 2 is δ ₂ .

FIG. 1B shows another embodiment. In this embodiment, the tip of the valve body 5 has a conical shape, and the valve seat 10 is press-fitted into the body 4.

Next, the operation of the solenoid valve of the embodiment will be described with reference to FIG. FIG. 2A shows a state in which the plunger is attracted by the magnetic flux and moves upward, and the step of the joint 11 and the step of the plunger 2 come into contact with each other. At this time, the valve body 5 is still in contact with the valve seat. In this case, the distance between the plunger 2 and the yoke 1 is δ ₁ −δ ₂ , and since the warpage distance is small, the attractive force of the magnetic flux is large, and the plunger 2 easily holds the valve body 5 via the joint 11. Can be raised.

FIG. 2B shows a state where the plunger 2 and the yoke 1 are in contact with each other. At this time, a gap of δ ₁ −δ ₂ occurs between the valve body 5 and the valve seat. Therefore, the pressure of the fluid does not act on the valve body 5, the compression coil spring 12 lifts the joint 11 and the valve body 5, and the gap between the valve body 5 and the valve seat is δ ₁ as shown in FIG. And a sufficient flow path is formed.

The compression coil spring 12 only needs to lift the joint 11 and the valve body 5 when the pressure of the fluid does not act, its elasticity is small, and the power consumption for attracting the plunger 2 is small.

Further, since the valve body is first lifted by the plunger 2 without using the elastic force of the spring, the opening operation of the valve is reliable.

FIG. 3 shows a case where the yoke 1 and the pipe 6 are attached to the body 4 in an inclined state. In this case, even if the plunger 2 guided by the pipe 6 tilts, the plunger 2 pushes the valve body 5 by the convex surface 2a, so that the tilt of the plunger 2 is not transmitted to the valve body 5 and the valve body 5 moves to the valve seat 4a. Completely adhered.

[0031]

[Effect of the device]

 As described above, according to the structure of the solenoid valve of the present invention, the leakage of fluid is prevented and the power consumption of the solenoid is reduced.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing the structure of a solenoid valve according to an embodiment of the present invention. FIG. 1B is a sectional view showing the structure of a solenoid valve according to another embodiment of the present invention.

FIG. 2 is a sectional view showing the operation of the solenoid valve according to the embodiment of the present invention.

3 (a) is a sectional view showing a special state of the solenoid valve, and FIG. 3 (b) is an enlarged view showing a portion of FIG. 3 (a).

FIG. 4 (a) is a sectional view showing an example of a conventional solenoid valve,
FIG. 4B is a sectional view showing another example of the conventional solenoid valve.

FIG. 5 (a) is a sectional view showing a special state of a conventional solenoid valve, and FIG. 5 (b) is an enlarged view showing a portion of FIG. 5 (a).

FIG. 6 is a sectional view showing still another example of a conventional solenoid valve.

[Explanation of symbols]

 1 yoke 2 plunger 3 solenoid 4 body 5 valve body 6 pipe 7 O ring 8 O ring 9 compression coil spring 10 valve seat 11 joint 12 compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A plunger and a valve body are pulled in a pulling direction by locking a step between a plunger reciprocally driven by turning on and off a solenoid current and a valve body that opens and closes a fluid passage of a valve seat at a step of a joint. A valve structure of a solenoid valve, which is structured so that it has a play and is coupled, a compression coil spring is interposed between the plunger and the joint, and the upper surface of the valve seat is pressed by a convex surface provided at the tip of the plunger.