JPH01250683A - Solenoid valve device - Google Patents

Abstract

PURPOSE:To let a fluid flow smoothly and to prevent deposition of foreign matter by forming confronting surfaces of a movable valve element an a valve seat in conical surfaces stretched outward from the central portion of a fluid passage. CONSTITUTION:Confronting surfaces 30, 31 of a movable valve element 17 and a valve seat 21 of a solenoid valve 10 are formed in conical surfaces stretched outward from the central portion of a fluid passage. The solenoid valve 10 is constructed so that when an electric current is applied to an electromagnetic coil 24, the movable valve element 17 is sucked to the valve seat 21 side of a fixed iron core 21 and seated there to intercept circulation of fluid. When an electric current applied to the electromagnetic coil 24 is stopped, a ball body 17a is pushed to the right by fluid pressure to move the movable valve element 17, so that the fluid is smoothly circulated as shown by an arrow F.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a normally open electromagnetic valve device in which a movable valve body is opened by fluid pressure.

(Prior Art) The solenoid valve device proposed in the conventional Japanese Patent Application No. 62-67422 will be explained with reference to FIG. A movable valve body 17 made of a magnetic material and holding a ball body 17a made of a non-magnetic material that is arranged in a fluid passage and controls the flow of fluid by contacting and separating from a valve seat 21b provided in the fluid passage.
and a fixed iron core 21, a cylindrical casing 22, and a yoke 25, which are arranged around the sleeve 26 and the bobbin 23 to form a magnetic circuit so as to operate the movable valve body 17 into contact with or away from the valve seat 21b. It is formed from an electromagnetic coil 24 arranged on the bobbin 23 so as to generate magnetic force in a magnetic circuit.

Therefore, when current is applied to the electromagnetic coil 24, the movable valve body 17
is attracted to the fixed iron core 21 side, thereby moving to the left and coming into contact with the valve seat 21a. As a result, the communication between the input boat 21a of the fixed iron core 21 and the output boat 28a of the plate 28 is interrupted via the non-magnetic ball body 17a. Next, when the electromagnetic coils 24-... are de-energized, the fluid pressure applied to the input port 21a causes the ball body 1 to
By moving 7a to the right, it is separated from the valve seat 21b, and the movable valve body 17 also moves to the right. Therefore, communication is made between the input port 21a of the fixed iron core 21 and the output port 28a of the plate 28. Note that there is a communication groove 1 on the outer periphery of the movable valve body 17.
7b is formed, and the movable valve body 1 is connected through this communication groove 17b.
The left and right ends of 7 are communicated with each other.

(Problems to be Solved by the Invention) In the conventional solenoid valve device, as shown in FIG. It has become. Therefore, when the current is not energized, the pressure fluid bends at almost right angles and flows as shown by the arrow F, so that a stagnation 29 occurs in the gap between the two end faces.For this reason, foreign matter in the fluid accumulates in this area, and when the current is energized, the ball body 17a
In addition, in the conventional case, as shown in FIG. 3 showing the attraction force characteristic diagram, since the attraction force at point a is small at the start of energization, the stroke of the movable valve body 17 It is necessary to set it small, which causes problems such as malfunction even with a small amount of foreign matter.

The present invention has been proposed to solve the above-mentioned conventional problems.

[Structure of the invention]

(Means for Solving the Problems) Therefore, the present invention provides a housing made of a non-magnetic material that forms a fluid passage, and a housing that is arranged in the fluid passage and comes into contact with and separates from a valve seat provided in the fluid passage. a movable valve body made of a magnetic material holding a ball body made of a non-magnetic material for controlling the flow of fluid; It consists of a magnetic circuit arranged in a housing, and an electromagnetic coil arranged in the housing so as to generate magnetic force in the magnetic circuit, and the ball is held in the movable valve body by passing a streetcar to the electromagnetic coil. In the electromagnetic valve device, the ball body moves away from the valve seat due to fluid pressure when the body is brought into contact with the valve seat, and the ball body is moved away from the valve seat due to fluid pressure. It is formed into a conical surface that spreads outward from the center of the passage, and is used as a means to solve the problem.

(Operation) When the electromagnetic coil is energized, the movable valve body is attracted to the valve seat side of the fixed iron core and moves, whereby the ball body is seated on the valve seat and the flow of fluid is interrupted. Next, when the electromagnetic coil is de-energized, the fluid pressure applied to the input port pushes the ball body toward the movable valve body and moves it. In this case, since the opposing surfaces of the movable valve body and the valve seat are each formed into a conical surface that spreads outward from the center of the fluid passage, the fluid flows smoothly as shown by arrow F (the end surface of the fixed iron core There is no possibility that foreign matter will accumulate between the end face of the movable valve body and the end face of the movable valve body.

(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 and 2 show embodiments of the present invention.

In the figure, the electromagnetic valve device 10 includes a fixed core 21 having an input port 21a, and a sleeve 26 fixed to the fixed core 21 and forming a fluid passage.

A resin bobbin 23 is arranged around the fixed iron core 21, and an electromagnetic coil 24 is wound around the 8-inch bobbin 23. A movable valve body 17 made of a magnetic material is disposed within the sleeve 26, and a plate 28 having an output port 28a is disposed on the right side of the valve body 17.

Further, a yoke 25 made of a magnetic material is disposed between the bobbin 23 and the plate 28, and a cylindrical casing 22 made of a magnetic material is disposed between the yoke 25 and the fixed iron core 21, forming a magnetic circuit. There is. A ball body 17a made of a non-magnetic material is fitted onto the left end of the movable valve body 17 in the drawing, and the ball body 17a is seated on the valve seat 21b of the fixed iron core 21 when the valve is closed (FIG. 2). . The right end of the movable valve body 17 in the drawing is a cylindrical portion 17c, and a plurality of communication grooves 1 provided on the outer periphery.
It is designed to communicate with 7b.

A fourth feature of the present invention is that the opposing surfaces 30 and 31 of the movable valve body 17 and the valve seat 21 are each formed into a conical surface extending outward from the center of the fluid 1ffl path. . Note that the cone angle α that spreads toward the movable valve body 17 is 120
It is preferable that the diameter is less than 1°.

Next, the effect will be explained. First, when the electromagnetic coil 24 is energized, the movable valve body 17 is attracted to the valve seat 21b side of the fixed iron core 2 (FIG. 2). As a result, the ball body 17a is seated on the valve seat 21b, and fluid flow is blocked. Furthermore, when the electromagnetic coil 24 is de-energized, the fluid pressure applied to the input port 21a pushes the ball body 17a to the right as shown in FIG. 1, so the movable valve body 17 moves and The fluid flows as shown by arrow F.

When the movable valve body 17 moves to the right, the ball body 17a
Since the ball body 17a is made of a non-magnetic material, the ball body 17a is not affected by residual magnetism between it and the fixed iron core 21. Therefore, the pressure of the fluid is transmitted to the movable valve body 17 via the ball body 17a, so it always becomes a force in the horizontal direction, and the movable valve body 17 moves smoothly along the sleeve 26 as shown by the arrow Q.

〔Effect of the invention〕

As explained in detail above, the present invention has the movable valve body and the valve seat each having opposing surfaces formed into conical surfaces expanding outward from the center of the fluid passage, so that the fluid flowing from the input port when not energized is Since the water flows smoothly as shown by arrow F, there is no stagnation or accumulation of foreign matter. Further, as shown in the suction characteristic diagram during energization shown in FIG. 3, the suction force of the valve is greater than that of the conventional valve when energization is started, and therefore the stroke of the movable valve body can be set larger, and this also prevents the accumulation of foreign matter.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing an open state of a solenoid valve device showing an embodiment of the present invention, FIG. 2 is a side cross-sectional view showing the same solenoid valve device in a closed state, and FIG. Figure 4 is a side sectional view showing the valve open state of the conventional device;
The figure is a side sectional view showing a conventional device in a valve closed state. Description of main parts of the figure 10-Solenoid valve device 17-Movable valve body 17a-Ball body 17b-Groove 17c-m-Cylindrical portion
21 Fixed iron core 21a - human powered boat
21b - Valve seat 22 - Casing 23
Bobbin 24 / Electromagnetic coil 25 Yoke 26
- Sleeve (housing) 2F plate 28a - Output boat 30.3
1.One facing surface

Claims (1)

[Claims] a housing made of a non-magnetic material forming a fluid passage; and a housing disposed in the fluid passage and in contact with a valve seat provided in the fluid passage;
A movable valve body made of a magnetic material holding a ball body made of a non-magnetic material that is spaced apart to control the flow of fluid, and the movable valve body,
It consists of a magnetic circuit disposed in the housing so as to operate the movable valve body in contact with the valve seat, and an electromagnetic coil disposed in the housing so as to generate a magnetic force in the magnetic circuit. energizing a coil to cause a ball body held by the movable valve body to come into contact with the valve seat;
In the electromagnetic valve device in which the ball body moves away from the valve seat due to fluid pressure when energization is stopped, each opposing surface of the movable valve body and the valve seat is a conical surface expanding outward from the center of the fluid passage. A solenoid valve device characterized by being formed in.