JP2001214986A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve that can reduce impact noise in valve closing independently of the hardness of its elastic member (valve plate) positioned in that portion of its valve element which makes butt contact in valve closing, and can reduce impact noise in valve opening at the same time. SOLUTION: A cushioning member 5 is interposed between a holder 7 and a valve plate 9 consisting of an elastic member, and a plurality of, for example two, concentric annular projections 9a and 9b are formed on that surface of the valve plate 9 which faces the cushioning member 5 to form an air layer 9c with the cushioning member 5. When a valve element 3 is butted against a valve seat 2e, the cushioning member 5 softly receives or cushions the valve plate 9, and simultaneously exhibits a cushioning effect via deformation only by the air layer, to thus reduce impact noise in the valve closing independently of the hardness of the elastic member (valve plate 9). Another elastic member 18 of foam rubber reduces impact noise in valve opening appreciably.

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 impact noise, it is more effective to increase the hardness to ensure durability, and the selection range of the hardness is to satisfy both. Limited and may not be sufficient to reduce collision noise. Also, the elastic member provided at a position where the valve element contacts when the valve is opened may be insufficient for reducing the collision noise when the hardness is equal to or higher than a predetermined hardness as in the case of closing the valve. Therefore, the present invention provides an electromagnetic valve that can reduce the collision noise at the time of closing the valve without being affected by the hardness of the elastic member (valve plate) provided at the contact portion of the valve body at the time of closing the valve. Make it an issue. 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. A buffer member is sandwiched between a holder constituting the valve body and a valve plate made of an elastic member, and a plurality of concentric projections are provided on a surface of the valve plate on the buffer member side, It is characterized in that an air layer is formed between the cushioning member. The invention according to claim 2 is characterized in that the cushioning member is made of foamed rubber having a hardness of less than 40 °.
The invention according to claim 3 is characterized in that an elastic member made of foamed rubber having a hardness of less than 40 ° is provided at a position where the plunger constituting the valve body contacts when the valve is opened.

[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, a solenoid valve 1 is a resin-made passage housing 2 constituting a passage portion 1a.
And an electromagnetic actuator section 1c for driving the valve element 3 constituting the valve section 1b, and a connector section 1d for supplying power, and comprise a resin coil housing 4 formed by secondary molding. 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 opened and closed by electromagnetic driving. 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 (neither is shown). A valve seat 2e constituting the valve portion 1b is formed integrally or integrally with the passage housing 2 on an extension of the inner wall of the inflow port 2a.

The valve element 3 constituting the valve section 1b is fitted with a projection 7a of a holder 7 and fixed with a stopper 8, and has a hardness of 70.
Valve plate 9 made of rubber elastic member of 70 ° (70 IRHD)
And a plunger 11 pressed at the lower end of the rod 10 by a spring 19, and the rod 10
Is configured to be able to float around the center of the stator 13 caulked to the plate 12. The cushioning member 5 functions as a cushioning material for reducing the impact sound, and as the material, a material having a hardness of 20 ° to less than 40 ° that is easily reduced in hardness, such as a foamed rubber having a cellular structure and high flexibility, is used. On the surface of the valve plate 9 on the side of the buffer member 5, a plurality (2 in this embodiment)
The projections 9a, 9b are provided with concentric projections 9a, 9b of
The air layer 9c is formed in the gap by the and the buffer member 5.
That is, the air layer 9c is arranged to be formed on the back side of the contact portion of the valve plate 9 with the valve seat 2e. The two concentric projections 9a and 9b are also provided on the surface of the valve plate 9 on the valve seat 2e side in consideration of the assemblability, and the work of identifying the front and back of the valve plate 9 may be omitted. However, the effect of reducing the collision sound is the same and there is no problem. The projections 9a and 9b also have a function of preventing leakage from the fitting portion (central portion) of the rubber valve plate 9.

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
Is connected to the terminal 16 of the connector section 1d (not shown), and the other end is grounded (not shown) and is 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. An elastic member 18 is provided between the plunger 11 and the bobbin 14 so that the plunger 11 comes into contact when the valve body 3 is opened. Elastic member 1
Reference numeral 8 is fitted and fixed to a projection 14 a provided on the bobbin 14. The elastic member 18 is formed of foam rubber having a hardness of less than 40 °.

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.
And moves upward against the valve seat 2e to close the passage 2c. At this time, the valve plate 9 is flexibly received and buffered by the buffer member 5, so that the collision sound of the valve plate 9 is reduced. At the same time, the buffer member 5 is deformed and buffered by the air layer of the air layer 9c provided between the valve plate 9 and the buffer member 5,
The collision sound when closing the valve plate 9 is further reduced. When the energization stops and the valve body 3 is pushed by the spring 19 and leaves the valve seat 2e, the valve body 3 moves downward due to the pressing force of the spring 19, and the plunger 11 collides with the elastic member 18.
The collision energy is absorbed by the elastic member 18 made of foamed rubber, and the valve body 3 can be flexibly received, so that the collision sound at the time of opening the valve is reduced. In the above specification, the collision noise at the time of the on-off valve is reduced by about 10 dB as compared with the conventional case. The hardness of the elastic member 18 made of foamed rubber tends to be higher than the hardness of the cushioning member 5 because the elastic member 18 is a weak collision due to the pressing force of the spring 19.

[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 cushioning member is interposed between the valve plate and the holder, and a plurality of concentric projections are provided on the surface of the valve plate on the cushioning member side, so that the air layer is formed. When the valve body collides with the valve seat, the cushioning member flexibly receives and cushions the valve plate, and at the same time, the cushioning member is deformed and cushioned by an air layer, so that the collision sound at the time of valve closing is made of the elastic member. It is reduced without being affected by the hardness of the valve plate. Further, in the invention of claim 2, by using foamed rubber as the cushioning member,
A member with low hardness can be easily manufactured. According to the third aspect of the present invention, the elastic member provided at a position where the plunger constituting the valve body comes into contact when the valve is opened is made of a material having a hardness of 4.
Since it is made of a foamed rubber of less than 0 °, the collision energy is absorbed at the time of collision and acts to receive the valve member flexibly, so that the collision sound at the time of opening the valve 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 3 Valve body 5 Buffer member 7 Holder 9 Valve plate 9a Projection 9b Projection 9c Air layer 18 Elastic member

Claims (3)

[Claims] An electromagnetic valve that opens and closes a fluid passage when an electromagnetically driven valve element contacts and separates from a valve seat, wherein a buffer is provided between a holder constituting the valve element and a valve plate made of an elastic member. An electromagnetic valve, wherein a member is sandwiched, a plurality of concentric protrusions are provided on a surface of the valve plate on the side of the buffer member, and an air layer is formed between the valve member and the buffer member. 2. The solenoid valve according to claim 1, wherein said cushioning member is made of foamed rubber having a hardness of less than 40 °. 3. The solenoid valve according to claim 1, wherein an elastic member made of foamed rubber having a hardness of less than 40 ° is provided at a position where the plunger constituting the valve body comes into contact when the valve is opened.