JP2576530Y2 - solenoid valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve with reduced operating noise when the valve is closed. For example, a flow rate control for adjusting a flow rate of fuel vapor guided to an idle speed control valve or an intake pipe of a vehicle. It can be used as a valve or the like.

[0002]

2. Description of the Related Art An electromagnetic valve is a valve that opens and closes using an electromagnetic force generated by an electromagnetic solenoid.
Solenoid valves are used to control the flow rates of various liquids and gases, such as water, fuel, and chemicals. By the way, since the solenoid valve opens and closes by using the electromagnetic force as described above, an operating sound of the movable body is generated. Here, the movable body refers to a valve body and a movable iron core that operates the valve body.

[0003] In particular, pulse width variation (Pulse Width)
In an electromagnetic valve that performs flow rate control using the th modulation, the operation noise has become a problem due to the large number of opening and closing operations, and its reduction is desired. In order to deal with this operation noise,
As shown in FIG. 2 , a coil spring 93 as an urging force is provided between a movable iron core 95 provided with the valve element 2 and a fixed iron core 91.
A solenoid valve interposed between the two has been proposed (Japanese Patent Laid-Open No. 62-1).
No. 13977). In the figure, reference numeral 32 denotes a valve seat, and reference numeral 96 denotes a guide for the movable iron core 95.

In this solenoid valve, when an electromagnetic solenoid (not shown) is energized, an electromagnetic force is generated, and the movable iron core 95 is moved by the fixed iron core 91 to the coil spring 9.
It is sucked against the urging force of No. 3. Therefore, the valve body 2 opens and the fluid flows. On the other hand, when energization is stopped, the valve 2
It is pressed in the direction of the valve seat 32 by the coil spring 93 to close the passage of the valve seat. In this solenoid valve,
The operating noise is reduced by balancing the electromagnetic attraction force and the urging force of the spring 93 that urges the valve body 2.

[0005]

However, in the above-described conventional solenoid valve, when the valve is closed, the coil spring 93 is closed.
The movable body composed of the movable iron core 95 and the valve body 2 collides with the valve seat 32 due to the urging force, and the operating noise when the valve is closed is large. Since the valve body 2 has a valve member made of rubber or the like fixed to the rigid body of the movable iron core 95, a slight reduction in operating noise can be expected due to the elasticity of the valve member, but this is not sufficient.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an electromagnetic valve which has a simple structure and can reduce the operating noise when the valve is opened and closed.

[0006]

According to the present invention, there is provided a valve seat provided in a case, a valve body for opening and closing a passage of the valve seat, a movable core provided with the valve body operated by an electromagnetic solenoid and a fixed core. An electromagnetic valve having a biasing member disposed between the movable core and the fixed core for biasing the valve body toward a valve seat, wherein the valve body is made of an elastic material; the aforementioned valve member is connected by a flexible member, or
The flexible member may be an extension of the flexible member.
While being fixed in the case via a flexible member,
On the valve seat side of the flexible member in the case, the valve
When the body is seated on the valve seat, the tip of the armature
The valve body has a first space portion for preventing contact with the case, and is provided on the back surface of the valve body opposite to the valve seat when the valve body is seated on the valve seat. An electromagnetic valve having a second space for preventing contact with the electromagnetic valve.

As the above-mentioned flexible member, there is a plate-like spring material such as a flat plate, a corrugated plate or the like. As the spring material, for example, a spring steel plate is used. The flexible member has an arcuate arm shape,
It may be a perforated plate shape. The flexible member is interposed between the movable iron core and the valve body, and elastically supports the valve body with respect to the movable iron core. The elastic material used for the valve body includes rubber, plastic, elastomer and the like.
Further, as an urging member provided between the fixed iron core and the movable iron core, for example, a coil spring is used.

[0008]

In the present invention, the valve body is connected to the movable iron core by a flexible member having elasticity, and the valve body is provided on the back surface of the valve body on the side opposite to the valve seat even when the valve body is seated. No. to prevent the body from touching the armature
It has two spaces. Therefore, when the valve closed, the movable core and the valve body is pushed in the direction of the valve seat by the urging member, even if the collision valve body to the valve seat, because of the above-mentioned second space, the valve body <br/> Does not come into contact with the movable iron core . Therefore, the impact force is hard to be transmitted to parts other than the valve body and the flexible member, and is absorbed and reduced by the elastic force of the valve body and the elastic force of the flexible member. Further
When the valve is closed, the valve body made of elastic material
When seating, the movable space
The tip of the heart does not contact the case. Therefore, both
No collision sound is generated. Accordingly, you to reduce the operation noise during the valve closure on a large width.

On the other hand, when the valve is opened, the movable iron core is attracted to the fixed iron core as in the prior art, against the urging force of the urging member. At this time, the operating sound is reduced because the urging material absorbs the suction impact force. Further, the flexible member may be usually a plate-like body, and has a simple structure. Therefore, according to the present invention, it is possible to provide an electromagnetic valve that can reduce the operating noise when the valve is opened and closed with a simple structure.

[0010]

Embodiment 1 An electromagnetic valve according to an embodiment of the present invention will be described with reference to FIG. The solenoid valve of the present embodiment is operated by a valve seat 32 provided inside a case 3, a valve body 2 for opening and closing a passage 321 of the valve seat 32, an electromagnetic solenoid 4, and a fixed iron core 46. And a movable iron core 51 provided with. A coil spring 52 is provided between the movable iron core 51 and the fixed iron core 46 as an urging member for urging the valve body 2 toward the valve seat 32.

The valve 2 is made of rubber as an elastic material, and the valve 2 and the movable iron core 51 are connected by a flexible member 1. The flexible member 1
Is a spring steel disc-shaped, it has a rear 22 of the valve body 2 is fitted and fixed to the central portion of it. The flexible member 1 is fixed to a distal end opening 511 of a movable iron core 51 having a U-shaped cross section. The distal end opening 511 and the flexible member 1 are elastically fixed by a rubber ring 18. This fixing can also be performed by using rivets, welding, adhesives, or the like. Further, the flexible member 1 is more renewable than the fixing member.
Has an extended flexible member extended to the outside. Soshi
The outer peripheral portion of the extended flexible member 10 is
Between the portion 34 and the contact portion 351 of the coil bobbin 35.
Is defined. The front surface 21 of the valve body 2 faces the end surface 322 of the valve seat 32. Further, as is apparent from the figure, the back surface of the valve element on the side opposite to the valve seat is located toward the second space portion 39 which is the internal space of the movable iron core having a U-shaped cross section, and the valve element is seated. Sometimes, the valve body and the movable iron core are arranged so as not to come into contact with each other. In case 3 above,
On the valve seat side of the flexible member 1, the valve body 2 is provided with the valve.
When seated on the seat 32, the tip of the movable core 51 (tip
The opening 511) contacts the inner wall of the case 3.
It has a first space 38 for prevention.

As shown in FIG. 1, the rear end 512 of the movable iron core 51 faces the recess 461 of the fixed iron core 46.
A coil spring 5 as the urging member is provided between the two.
2 are interposed. The electromagnetic solenoid 4 is a fixed iron core 4
6 and a coil 41 wound therearound. In addition, case 3 provided with valve seat 32
Has an inlet port 31 and an outlet port 33. The passages 311, 321 provided in these ports 31, 32 are:
The opening or closing of the valve body 2 causes communication or closure. Reference numeral 36 is a bearing portion of the movable iron core 51 in FIG. 1, 43 coil bobbin 45 is magnetic plates.

Next, the function and effect will be described. In the solenoid valve according to the present embodiment, when the valve is opened, the electromagnetic solenoid 4 is first energized. As a result, an electromagnetic force is generated in the fixed core 46. Therefore, the movable iron core 51 is attracted in the direction of the fixed iron core 46 along the bearing 36 against the urging force of the coil spring 52. Therefore, the valve body 2 attached to the fixed core 46 via the flexible member 1 is separated from the valve seat 32.
Therefore, the passage 31 between the inlet port 31 and the outlet port 32
1, 321 communicate with each other, and the fluid flows.

When the valve is opened, the operating force is low because the suction force of the movable core 51 is reduced by the elastic force of the coil spring 52. On the other hand, when the valve is closed,
The energization of the electromagnetic solenoid 4 is stopped, and the electromagnetic force of the fixed iron core 46 disappears. Therefore, the movable core 51
The valve body 2 is pushed toward the valve seat 32 by the urging force of the coil spring 52, and the valve body 2 collides with the valve seat 32.

However, at this time, the valve body 2 and the movable core 51
Is bent by the elastic force. The second space is provided on the back surface of the valve body 2 on the side opposite to the valve seat. Therefore, the impact force at the time of the collision is absorbed by the flexible member 1. In addition, a valve body made of an elastic material
When sitting, the first space and the second space
There is a possibility that the tip of the movable core contacts the case
And the valve body does not contact the movable iron core. That
Therefore, the impact force when the valve body collides with the valve seat is
Difficult to transmit to other than the flexible member. In addition, the elastic force of the valve seat
The impact force is absorbed by the elastic force of the flexible member,
Sound generated at the valve seat can be greatly reduced. Therefore,
The generation of operating noise when the valve is closed is extremely low. In this example,
In addition, the flexible member 1 is further provided with an extended flexible member 10.
Then, as described above, the case 3 and the coil bobbin 35
It is supported between. Therefore, the movable core 51 is
Elastically supported by the long flexible member 10, and its bearing
Friction with the part 36 can be reduced. As described above, according to the present embodiment, the operation noise at the time of opening and closing the valve can be effectively reduced with a simple structure. Others are described in Example 1.
Is the same as

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a solenoid valve according to a first embodiment.

FIG. 2 is an explanatory view of a main part of a conventional solenoid valve.

[Explanation of symbols]

 1. . . Flexible member, 10. . . 1. an extended flexible member; . . Valve body, 3. . . Case, 32. . . Valve seat, 4. . . Electromagnetic solenoid, 46. . . Fixed iron core, 51. . . Movable iron core, 52. . . coil spring,

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve seat provided in a case, a valve body for opening and closing a passage of the valve seat, a movable iron core operated by an electromagnetic solenoid and a fixed iron core and provided with the valve body, An electromagnetic valve having a biasing member disposed between the fixed core and the biasing member to bias the valve body toward a valve seat, wherein the valve body is made of an elastic material, and the movable core and the valve body are Are connected by a flexible member, and the flexible member is an extension of the flexible member.
It is fixed in the case via a flexible member.
On the valve seat side of the flexible member in the case,
When the valve body is seated on the valve seat, the tip of the armature moves
When the valve body is seated on the valve seat, the valve body has a first space portion for preventing contact with the case, and the valve body is attached to the movable iron core when the valve body is seated on the valve seat. An electromagnetic valve having a second space for preventing contact.