JP2001208235A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve capable of reducing collision noise when closing a valve without being affected by the hardness of an elastic member provided in an abutment part of a valve element in closing the valve and to reduce the collision noise in opening the valve. SOLUTION: The valve seat 5 is loosely fitted to a passage housing 2 and fixed thereto via an O-ring 6, and a prescribed clearance L1 is provided between a lock part 5a of the valve seat 5 and a lock part 2d of the passage housing 2. When the valve element 3 is collided with the valve seat 5, the valve seat 5 whose collision force is absorbed by the elasticity of the O-ring 6 is gently and axially moved and locked with the passage housing 2, so that the collision noise in closing the valve element 3 is sufficiently reduced. The elastic member 18 on which the valve element 3 abuts when fully opened, is made of a rubber foam with low hardness so as to absorb the collision energy and softly receive the valve element 3, thereby sufficiently reducing the collision noise when opening the valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for opening and closing a fluid passage, and more particularly, to a solenoid valve capable of reducing a collision sound when the valve is opened and closed.

[0002]

2. Description of the Related Art A solenoid valve used for opening and closing a fluid passage has a
Japanese Patent Laid-Open Publication No. Sho 57-117474 and Japanese Patent Laid-Open Publication No. Hei 7-22496 disclose a configuration for reducing the collision noise when the valve is opened and closed.
It is publicly known in Japanese Patent Publication No. 2 and the like. According to the above publication, the valve element is provided with an elastic member on the valve seat contact side of the valve element when the valve element is seated and on the stopper contact side of the valve element when the valve element is unseated. It is said that the collision sound when colliding with the seat and the stopper is reduced.

[0003]

However, the elastic member provided on the valve seat contact side is required to have a predetermined hardness in terms of both reducing the collision noise at the time of closing the valve and securing durability. In some cases, it is not sufficient to reduce the collision sound if the height is kept high. In other words, it is more effective to lower the hardness to reduce the collision sound, it is more effective to increase the hardness to secure the durability, and the hardness selection range is limited to satisfy both. This is because if priority is given to durability, it may not be enough to reduce the collision noise. In addition, when the elastic member provided at a position where the valve body comes into contact when fully opened is not less than a predetermined hardness, it may be insufficient to reduce the collision noise. Accordingly, it is an object of the present invention to provide an electromagnetic valve that can reduce a collision sound at the time of closing a valve without being affected by the hardness of an elastic member provided at a contact portion of a valve body at the time of closing the valve. At the same time, a second object is to reduce the collision noise when the valve is opened.

[0004]

According to a first aspect of the present invention, there is provided an electromagnetic valve which opens and closes a fluid passage when an electromagnetically driven valve body contacts and separates from a valve seat. The valve seat is fitted to the passage housing so as to be movable in the axial direction, is fixed via an O-ring made of an elastic member, and a predetermined gap is formed between the locking portion of the valve seat and the locking portion of the passage housing. Is provided. The invention according to claim 2 is that the valve body contacts at the time of full opening,
An elastic member made of foamed rubber is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a solenoid valve according to one embodiment of the present invention. In FIG. 1, an electromagnetic valve 1 includes a passage housing 2 forming a passage portion 1a and a valve portion 1b, an electromagnetic actuator portion 1c for driving a valve body 3 forming a valve portion 1b, and a connector portion for supplying power. 1d and a coil housing 4 formed by a secondary mold. The passage housing 2 is provided with a fluid inlet 2a and a fluid outlet 2b, and a valve portion 1b is formed in a passage 2c between the two, and the passage 2c is electromagnetically driven.
Open and close. The inflow port 2a is connected to the atmosphere and the outflow port 2b is connected to each passage of the internal combustion engine, for example, a canister or an intake passage (both not shown). Valve part 1
The valve seat 5 which is made of metal or resin and which can be moved in the axial direction is fitted into the passage 2c, is made of an elastic member such as rubber, and maintains airtightness by an O-ring 6 having a hardness of 40 ° to 80 °. Is fixed. A predetermined gap L1 is provided between the locking portion 5a of the valve seat 5 and the locking portion 2d of the passage housing 2. The gap L1 is set to 0.2 to 0.8 mm.

The valve body 3 constituting the valve is made of rubber (having a hardness of 70) fitted to the projection 7a of the holder 7 and fixed with the stopper 8.
°), a rod 10 loosely fitted to the holder 7 and a plunger 11 pressed at the lower end of the rod 10 by a spring 19, and the rod 10 is a plate 12
The center of the stator 13 crimped on the shaft 13 is freely movable. The valve element 3 is urged by a spring 19 in the valve opening direction. The plate 12 is held together with the bobbin 14 by the coil housing 4 and the passage housing 2. A coil 15 is wound around the bobbin 14, one end of the coil 15 is connected to a terminal 16 of the connector 1d (not shown), and the other end is grounded (not shown) to be energized. A metal yoke 17 is provided below the bobbin 14, and forms a closed magnetic path together with the metal stator 13 and the plate 12. Plunger 11 and bobbin 1
An elastic member 18 is provided between the plungers 4 so that the plunger 11 abuts when the valve 3 is fully opened. The elastic member 18 is fitted and fixed to a projection 14 a provided on the bobbin 14. The elastic member 18 is formed of foamed rubber (hardness 20 °) having a lower hardness than general rubber.

Next, the operation of the present embodiment will be described with reference to FIG. When electricity is supplied to the coil 15 through the terminal 16, the plate 12, the stator 13, the plunger 1
1, the yoke 17 forms a closed magnetic path, and the plunger 11 is pulled up. Therefore, the valve body 3 including the rubber valve plate 9 having a hardness of 70 ° moves upward against the spring 19 and is made of resin. Valve seat 5 (resin was used as test)
To close the passage 2c. At this time, the impact force of the valve seat 5 is absorbed by the elasticity of the O-ring 6 having a hardness of 60 °, and at the same time, the impact moves gently in the axial direction to further absorb the impact. Locking part 2 of housing 2
a. Therefore, the collision noise at the time of closing the valve portion 1b is reduced without reducing the degree of freedom in designing the hardness of the O-ring 6.

That is, even when the hardness of the valve plate 9 or the O-ring 6 is high, the collision noise at the time of closing the valve is reduced.
In the above specification, the collision sound was reduced from 64 dB to 60 dB. When the hardness of the valve plate 9 and the O-ring 6 is low,
When the valve is closed, the valve seat 5 moves in the axial direction, so that the valve plate 9 does not bite into the valve seat 5 and the durability of the rubber valve plate 9 is not reduced, and the collision noise is sufficiently reduced. You. When the energization is stopped and the valve body 3 is pushed by the spring 19 and leaves the valve seat 5, the valve seat 5 returns to the original state while maintaining the predetermined gap L1 again by the elastic restoring force of the O-ring 6. The valve body 3 moves downward by the pressing force of the spring 19, and the plunger 11 collides with the elastic member 18. However, the collision energy is absorbed by the elastic member 18 made of foamed rubber having a hardness of 20 °, and the valve body 3 becomes flexible. Since it is received, the collision sound at the time of opening the valve is sufficiently reduced.

[0009]

The present invention has the following effects because it is configured as described above. That is, in the first aspect of the present invention, the valve seat is fitted to the passage housing so as to be movable in the axial direction, and is fixed via the O-ring made of an elastic member. Since a predetermined gap is provided between the valve seat and the valve, when the valve body collides with the valve seat, the impact force is absorbed by the elasticity of the O-ring, and at the same time, the impact force is further absorbed by moving gently in the axial direction. As a result, the collision noise at the time of closing the valve portion is sufficiently reduced without being affected by the hardness of the elastic member. Claim 2
According to the invention, the elastic member provided at a position where the valve body comes into contact when the valve body is fully opened is made of foamed rubber having a low hardness. The collision sound at the time is sufficiently reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Passage housing 2d Locking part 3 Valve body 5 Valve seat 5a Locking part 6 O-ring 9 Valve plate 18 Elastic member

Claims (2)

[Claims] An electromagnetic valve that opens and closes a fluid passage when an electromagnetically driven valve body contacts and separates from a valve seat, wherein the valve seat is fitted to the passage housing so as to be movable in the axial direction, and an elastic member is provided. An electromagnetic valve which is fixed via an O-ring made of: a predetermined gap is provided between a locking portion of the valve seat and a locking portion of the passage housing. 2. An elastic member made of foamed rubber is provided at a position where the valve body contacts when fully opened.
The described solenoid valve.