JPH05263960A - Muffling type solenoid valve - Google Patents

Abstract

PURPOSE:To reduce an operating noise to be produced at the on-off operation of a valve by attaching a valve opening or closing elastic member being situated between a valve seat and a plunger to be integrated with a valve body and making a plunger tip face come into contact with this elastic member by means of a holding spring. CONSTITUTION:At the time of valve opening when a valve opening or closing elastic member 10 as one body with a valve element 9 canes into contact with an end face of a plunger 6 by dint of energizing force of a return spring 12 and a magnetic solenoid 7 is turned off, if this solenoid 7 is turned to ON, the plunger 6 is attracted downward against the return spring 12 and the elastic member 10 comes into contact with a valve seat 5, coming into a state of being closed. At this time, since the end face of the plunger 6 comes into contact with the elastic member 10 by dint of energizing force of a holding spring 13 with weak energizing force, by means of the return spring 12, any impact noise is prevented from occurring without interposing any spacer or the like, for making up an air gap, between the end face of the plunger 6 and that of a core 8.

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 passage, for example, a passage for fuel vaporized gas from a float chamber of a carburetor, and more particularly to a silencer solenoid valve.

[0002]

2. Description of the Related Art Conventionally, as a flow path opening / closing solenoid valve, a valve seat 10 formed on a fluid passage 4 between an inlet port 2 and an outlet port 3 is disclosed, for example, in JP-A-62-75182. The valve body 6 formed integrally with the rod 5 integrally attached to the plunger 7 of the electromagnet is positively moved along the axis of the stator 8 of the electromagnet by the urging force of the second spring 12 and the driving of the electromagnet in the direction perpendicular to the plane. Attached so that it can reciprocate,
Moreover, a solenoid valve in which a seal member 6b that abuts the valve seat 10 is attached to the valve body 6 is shown.

[0003]

In this case, when the electromagnet is turned on in the valve open state where the valve body 6 is in contact with the end face of the stator 8 by the urging force of the second spring 12, the electromagnet is turned on. 2 The seal member 6 of the valve body 6 is moved by the suction movement against the biasing force of the spring 12.
Although b comes into contact with the valve seat 10 and closes the valve, the plunger 7 also comes into contact with the end surface of the stator 8 at that time to generate a metallic impact sound, or the plunger 7 and the stator are prevented from generating impact noise. If an air gap or a spacer or the like for forming the air gap is interposed between the end faces of 8, there is a drawback that the attraction performance of the electromagnet is significantly reduced. Next, when the electromagnet is turned off with this valve closed,
Although the valve body 6 comes into contact with the end face of the stator 8 by the urging force of the second spring 12 together with the plunger 7 to open the valve, the valve body 6 is made of hard resin or metal and the upper stator 8 is made of metal. Since it is formed, there is a drawback that a high metallic sound is generated as an impact sound when the valve body 6 comes into contact with the stator 8 by the urging force of the second spring 12. As a countermeasure against this, for example, an impact sound absorbing elastic member such as a seal member 6b may be attached to one surface of the valve body 6 and the stator 8 which are in contact with each other. In that case, even if the impact sound can be absorbed, There is a drawback that the performance of the electromagnet is significantly reduced. Therefore, an object of the present invention is to provide a silencer type solenoid valve capable of significantly reducing the noise when the solenoid valve operates without reducing the performance of the electromagnet.

[0004]

That is, according to the present invention, a valve seat formed on a communication passage communicating a fluid inlet and a fluid outlet of a valve body, and a plunger reciprocates in a direction perpendicular to the surface of the valve seat. An electromagnetic solenoid attached to the valve body as described above, and a valve element attached reciprocally with the outer periphery of the guide core of the plunger as a guide,
A valve opening / closing elastic member that is integrally attached to the valve body and is located between the valve seat and the plunger; a return spring that is between the valve body and the valve body and biases the valve body in the valve opening direction; A silencer type solenoid valve is provided with a holding spring that urges the plunger in the valve closing direction with a weaker urging force than the return spring to lightly contact the plunger tip surface with the elastic member.

[0005]

[Operation] In the silencer type solenoid valve configured as described above,
The elastic member for opening and closing the valve, which is integrated with the valve body, is in contact with the end face of the plunger by the urging force of the return spring. When the electromagnetic solenoid is turned on while the solenoid is off, the urging force of the return spring of the plunger is resisted. Due to the suction movement, the valve opening / closing elastic member comes into contact with the valve seat to close the valve, but in this case, since the end face of the plunger is in contact with the valve opening / closing elastic member,
It is possible to secure sufficient suction performance of the plunger by the electromagnetic solenoid while preventing the generation of impact noise without interposing a spacer or the like for forming an air gap between the end surface of the plunger and the end surface of the core. it can.
Next, when the electromagnetic solenoid is turned off in this valve closed state, the valve element moves together with the plunger in the valve opening direction by the urging force of the return spring, causing the valve opening / closing elastic member to contact the end surfaces of the plunger and the core. The valve is opened, but at this time, no impact noise is generated even if the elastic member for opening and closing the valve collides with the end faces of the plunger and the core.

[0006]

As a result, the present invention has an effect that the operating noise generated when the valve is turned on and off can be greatly reduced while the suction performance of the plunger by the electromagnetic solenoid is sufficiently secured. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of an embodiment of the present invention will be described with reference to the drawings. Fluid inlet 2 and fluid outlet 3 of valve body 1
An electromagnetic solenoid 7 is attached at a position perpendicular to the surface of the valve seat 5 formed on the communication passage 4 that communicates with the solenoid valve 7 with the axial center of the plunger 6 aligned with the hole center of the valve seat 5. A valve body 9 is reciprocally attached to the tip of the core 8 of the electromagnetic solenoid 7 that also serves as a guide, with the outer periphery of the core 8 serving as a guide. The valve body 9 is located between the valve seat 5 and the plunger 6. The valve opening / closing elastic member 10 is integrally attached to the valve body 9 in a state of being baked, and between the valve body 1 and the receiving portion 11 of the valve body 9,
A return spring 12 for urging the valve body 9 in the valve opening direction is attached, and between the electromagnetic solenoid 7 and the rear end surface of the plunger 6, the plunger 6 is urged in the valve closing direction by a weaker urging force than the return spring 12. Then, a holding spring 13 for attaching the tip end surface of the plunger 6 lightly to the valve opening / closing elastic member 10 is attached.

In the silencer type solenoid valve 14 thus constructed, as shown in FIG. 1, the valve opening / closing elastic member 10 integrated with the valve body 9 contacts the end face of the plunger 6 by the urging force of the return spring 12. Electromagnetic solenoid 7 OFF
When the electromagnetic solenoid 7 is turned ON in the valve open state of
As shown in FIG. 2, the return spring 12 of the plunger 6 is
The valve opening / closing elastic member 10 of the valve body 9 comes into contact with the valve seat 5 by the suction movement against the urging force of the valve seat 5 to close the valve. In this case, however, the end face of the plunger 6 becomes the valve opening / closing elastic member 10. Since they are in contact with each other, the impact noise is prevented from being generated between the end surface of the plunger 6 and the end surface of the core 8 without interposing a spacer or the like for forming an air gap.
It is possible to sufficiently secure the suction performance of. Next, when the electromagnetic solenoid 7 is turned off in this valve closed state, as shown in FIG. 1, the valve body 9 moves together with the plunger 6 in the valve opening direction by the urging force of the return spring 12, and the valve opening / closing elastic member. The valve 10 is brought into contact with the end faces of the plunger 6 and the core 8 to open the valve. At this time, even if the elastic member 10 for opening and closing the valve collides with the end faces of the plunger 6 and the core 8, an impact sound is generated. There is no such thing. As a result, while the suction performance of the plunger 6 by the electromagnetic solenoid 7 of the sound deadening solenoid valve 14 is sufficiently secured, the valve is turned on and off.
As shown in FIG. 4, the operating noise generated at the time of operation can be significantly reduced as compared with the conventional waveform diagram shown in FIG.

Next, FIG. 4 shows a state in which the valve body 9 of the silencer type solenoid valve 14 shown in FIGS. 1 and 2 is a resin valve body 15 having a U-shaped vertical cross section, and further, an elastic member for opening and closing the valve. A silencer type solenoid valve 19 in which 16 is fitted in a hole 17 formed in the valve body 15 so that the tip of the plunger 18 is received by a spherical surface to increase the degree of freedom of the valve body 15 and improve the sealing property of the valve. Other than that, the configuration, action, and effect are almost the same as those of the above-described embodiment.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing a valve-opened state of a silencer type solenoid valve 14.

FIG. 2 is a cutaway side view showing a valve closed state of a silencer type solenoid valve.

FIG. 3 is a waveform diagram of a sound generated when the conventional solenoid valve operates.

FIG. 4 is a waveform diagram of noise generated when the silencer type solenoid valve 14 is operated.

5 is a cutaway side view showing a valve-opened state of a sound deadening solenoid valve 19. FIG.

[Explanation of symbols]

 1 Valve Main Body 2 Fluid Inlet 3 Fluid Outlet 4 Communication Passage 5 Valve Seat 6 Plunger 7 Electromagnetic Solenoid 8 Core 9 Valve Body 10 Valve Opening / Closing Elastic Member 11 Receiving Spring 12 Retaining Spring 13 Silence Type Solenoid Valve 15 Valve Body 16 Elastic member for valve opening / closing 17 Hole 18 Plunger 19 Silence type solenoid valve

Claims (1)

[Claims] 1. A valve seat formed on a communication passage that communicates a fluid inlet and a fluid outlet of a valve body, and an electromagnetic solenoid attached to the valve body so that a plunger reciprocates in a direction perpendicular to a surface of the valve seat. And a valve element reciprocally attached with the outer periphery of the guide core of the plunger as a guide, and a valve opening / closing elastic member integrally attached to the valve element and located between the valve seat and the plunger. And a return spring for urging the valve body in the valve opening direction between the valve body and the valve body, and a plunger urging force in the valve closing direction with a weaker urging force than the return spring to move the plunger tip surface to the elastic member. A silencer type solenoid valve, each of which is provided with a holding spring that is lightly contacted with.