JPH02278084A - Solenoid valve - Google Patents

Abstract

PURPOSE:To smooth the movement of a valve by a method wherein, in a solenoid valve to open and close a valve through the action of an electromagnetic force, a filter to prevent mixture of a foreign matter in the slide part of the valve is mounted in the valve. CONSTITUTION:A valve 11 is guided by a valve guide 15 and moved to the right togetherwith a rod 4 against the spring force of a first spring 7 by means of a magnetic suction force, and a suction nipple 12a is communicated to an open air release nipple 12b. A foreign matter in fluid entering from a fluid chamber 14c through a communicating hole 14a to the interior of a pressure chamber 14b is caught by a filter 30, and the foreign matter is prevented form entrance from the back of the valve 11 to a slide part 11a. This constitution smoothes movement of the valve.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solenoid valve that opens a valve by the action of electromagnetic force.

[Prior Art] Fig. 3 is a sectional view showing an example of a conventional solenoid valve, and Fig. 4 is an enlarged view of the main part of Fig. 3. In the figure, (1) is a fixed core, and <2) is an outer periphery. A bobbin with a coil (3) wound around it, (
4) is a rod integrated with the movable iron core (5), (6m),
(6b) is a movable iron core (front plate, rear plate, knife) provided at the front and rear of the bobbin (2), respectively.
5) is the first spring biasing the first spring; (8) is the spring adjustment screw of this first spring ();
) is a yoke that forms a magnetic circuit with a coil (3), a front plate (6m), and a rear plate (6b).

(10) is a housing housing the valve (11);
2m) is a suction nipple as a first nipple connected to a negative pressure source, (12b) is an atmosphere release nipple as a second nipple communicating with the atmosphere, and (13) is a valve (11).
) is in contact with the valve seat, (X4a) is the valve (11
), the communication hole (15) is press-fitted into the housing (10) and a valve (11) is slidably provided on the inner circumferential wall surface to communicate the pressure chamber (14b) and the fluid chamber (14c). The cylindrical valve guide (16) is a second spring provided inside the housing 10) with one end abutting the valve (11).

In addition, (17) is the spring holder of the first spring (7), (18) is the terminal of the coil (3), and 19
) is a bearing, (20) is a leaf spring attached to the movable core (5) to prevent eccentricity of the movable core (5), and (21) is an O-ring.

The above electromagnetic valve is used to control the engine of an automobile, and uses a battery or the like as a power source, and responds to an operation command signal from a control device to open the control fluid.

That is, when the coil (3) is excited, the fixed iron core (1)
, the yoke (9), the front plate (6a), and the 71-part plate (6b) form a magnetic circuit, and the magnetic attraction force generated by this to the movable core <5) causes the first spring (7) to spring. Against the force, the valve (11) moves to the right along with the rod 4) guided by the valve guide 15, and the suction nipple (12a) and the atmosphere release nipple (12b) are brought into communication. In addition, the valve (11)
Since there is a communication hole (14m) in the liquid chamber (
The pressures in the pressure chamber (14e) and the pressure chamber (14b) are always equal.

On the other hand, when the coil (3) is de-energized, the spring force of the first spring (7) returns the valve (11) to close the valve seat (13) and prevent the flow of fluid.

When the valve (11) is opened, the fluid chamber (1
The pressure in the pressure chamber (14) is transferred to the pressure chamber (14) through the communication hole (14a).
Due to the pressure applied to b), the pressure acting on the valve (11) is canceled out.

[Problem to be solved by the invention] The conventional solenoid valve is configured as described above, and the liquid chamber (
14c) and the pressure chamber (1417>) through the communication hole (14c) and the pressure chamber (1417>).
a), so that the fluid chamber (14e) is more equal to the pressure chamber (14b) than the fluid chamber (14e), and foreign matter in the fluid that has entered the pressure chamber (14b) through the communication hole (14a) is removed from the back of the valve (11) by the sliding part (lla).
), which may cause the valve (11) to not move smoothly.

This invention was made to solve the above-mentioned problems, and aims to provide a solenoid valve that prevents foreign matter from entering the sliding part of the valve and allows the valve to move smoothly. .

Means for Solving 1 Problem] A solenoid valve according to the present invention is provided with a filter inside the valve to prevent foreign matter from entering the sliding portion of the valve.

[Operation J] In this invention, foreign matter in the fluid in the fluid chamber that attempts to enter from the back of the valve toward the sliding portion through the communication hole is blocked by the filter, and foreign matter is prevented from entering the sliding portion of the valve. is prevented.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of FIG. 1. The same or equivalent parts as in FIGS. Explanation will be omitted.

In the figure, (30) is a filter provided inside the valve (11).

In the solenoid valve configured in this way, the fluid chambers (1,
4c) through the communication hole (14a) to the pressure chamber (+, 4b
) The foreign matter in the driftwood that has entered the inside is captured by the filter (30), and the foreign matter is removed from the back of the valve (11) to the sliding part (lla
) is prevented from entering.

[Effects of the Invention] As explained above, in the solenoid valve of the present invention, when foreign matter mixed in the fluid tries to enter the sliding part from the back of the valve through the communication hole, the foreign matter is captured by the filter. This has the effect that the valve can be guided by the valve guide and can move smoothly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3 is a sectional view showing an example of a conventional solenoid valve, and FIG. It is an enlarged view of the main part of the figure. ('U) is a fixed core, (3) is a coil, (4) is a rod, (10) is a housing, (11) is a valve, (lla
) is the sliding part of the valve, (12a) is the suction nipple, (1
2b) is the atmosphere release nipple, (13) is the valve seat,
(14a) is a communication hole, (1,4b) is a pressure chamber, (14
e) is a fluid chamber, and (30) is a filter. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Teru So Ga Michi

Claims (1)

[Claims] A housing having a fluid chamber formed therein as a passage for fluid flowing from a first nipple to a second nipple; A valve having a pressure chamber formed therein and having a communication hole communicating the pressure chamber and the fluid chamber, a rod having the valve in contact with the tip thereof, a movable iron core fixed to the rod, and the movable iron core. A fixed iron core that accommodates the rod so as to be able to freely reciprocate and that moves the movable iron core back and forth by an electromagnetic action caused by a current flowing through the coil, and is provided between the valve seat and the fixed iron core. The electromagnetic valve includes a valve guide that slidably houses the valve and guides the reciprocating movement of the valve, characterized in that a filter is provided inside the valve to trap foreign matter in the fluid. Solenoid valve.