KR20180032269A - Noise Reduction Type Canister Close Solenoid Valve - Google Patents

Abstract

The present invention relates to a solenoid valve comprising: a bobbin installed inside a housing wherein a coil is wound on the outer circumferential surface; a core coupled to one side of the inside of the bobbin; a plunger coupled to the inside of the bobbin to be able to move vertically; a rod coupled to the plunger to pass through the inside of the core; and a seal coupled to the rod to open/close a passage of fluid. According to the present invention, a diaphragm expanded and contracted in accordance with motion of the plunger is installed between the seal to open/close the passage of the fluid and a bottom surface of the housing, and a vent hole communicating with the inside of the plunger is formed on the diaphragm. Moreover, by a force applied to the diaphragm due to a pressure difference in accordance with a moving amount of air which is moved in the opposite direction of a moving direction of the plunger to mitigate a pressure difference generated when the diaphragm is expanded and contracted, the moving speed of the plunger is reduced and the impact amount of the seal colliding with the bottom surface of the housing, thereby providing a noise reduction type canister close solenoid valve to reduce noise.

Description

Noise Reduction Type Canister Close Solenoid Valve {Noise Reduction Type Canister Close Solenoid Valve}

The present invention relates to a noise reducing type canister close solenoid valve, and more particularly, to a noise reducing type canister close solenoid valve that reduces operation noise (noise) according to the operation of the plunger.

Generally, gasoline-fueled vehicles are equipped with a fuel vapor leakage monitoring system and an evaporation gas emission suppression system that monitors the air leakage of fuel or vapor in the fuel system by establishing a closed system to check the fuel system leakage. have.

A fuel vapor leakage monitoring system and an evaporation gas emission suppression system are provided with a tank pressure sensor (FTPS) for sensing a pressure in a fuel tank, a canister for storing evaporative gas evaporating in the fuel tank, A canister close valve (CCV) in which the ON / OFF state of the valve changes, and a canister close valve (CCV) connected to the canister and the intake manifold side. The ON / OFF state of the valve is changed according to a control signal applied from the ECU And a purge control solenoid valve (PCSV) that delivers the evaporated gas to the intake manifold.

That is, the fuel purge gas generated in the fuel tank is introduced into the engine and burned according to the operating conditions of the engine through a line separate from the fuel line.

However, recent trend is that leakage monitoring is performed by closing the fuel system in the idle section of the vehicle. At this time, the closed valve should be operated by operating the close valve of the canister, so that the operation sound of the close valve of the canister is used for the noise, vibration, Harshness) are occurring.

In this case, when the power is applied, the knee close valve moves the plunger toward the core to close the valve. When the power is cut off, the spring returns to open the valve. When the valve is energized, An operation sound (noise) generated when the valve moved by the valve moved by the valve (on-state) and an operation noise (noise) caused by the plunger colliding with the inner wall of the housing due to the spring force , The intensity of the operation sound is determined by the speed of the plunger moving inside the valve when the valve is turned on / off and the amount of impact upon contact. In addition, there is a problem in that the operation sound when the on / off of the knock close valve flows into the room through the vehicle body, often complaining of the consumer.

Korean Patent No. 10-1093452 (December 13, 2011) Korean Registered Utility Model No. 20-0210310 (2001.01.15)

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems,

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diaphragm having a diaphragm having a breathing hole formed between a seal for opening and closing a fluid passage and a bottom surface of the housing to allow the diaphragm to expand and contract as the seal moves in conjunction with the operation of the plunger, The air is moved using the pressure difference generated during expansion and contraction and the operation speed of the plunger is reduced by using the pressure difference according to the amount of air moved in the direction opposite to the moving direction of the plunger, And an object of the present invention is to provide a noise reduction type solenoid valve which reduces noise by reducing an amount of impact of a seal and an amount of an impact of a plunger striking an inner wall of a housing.

In order to achieve the above object, the noise reduction type solenoid valve of the present invention is provided with a bobbin which is installed inside a housing and has a coil wound around its outer circumference, a core coupled to one side of the bobbin, A plunger coupled to one end of the plunger and projecting to the outside of the housing through the inside of the core; a seal coupled to the rod to open and close a passage of the fluid; And a spring for restoring the plunger,

Wherein a diaphragm is provided between a seal for opening and closing the passage of the fluid and a bottom surface of the housing, the diaphragm extending and retracting according to the operation of the plunger, the diaphragm having a pore through which air passes, The pressure difference caused by the amount of air moved in the direction opposite to the plunger moving direction in order to solve the pressure difference caused by the diaphragm is attenuated by the force acting on the diaphragm and the impulse amount of the seal hitting the bottom of the housing Thereby reducing the noise.

And one or a plurality of the breathing holes are provided.

The diaphragm is integrally formed with the seal. The diaphragm is integrally formed with the seal. The diaphragm is integrally formed with the seal. The diaphragm is integrally formed with the seal. The diaphragm is integrally formed with the seal. And is expanded and contracted when moved.

Here, the pneumatic hole is formed at the lower end of the curved portion.

The shock absorber for absorbing the impact of the plunger is coupled to the inner wall of the housing corresponding to the upper portion of the plunger.

According to an embodiment of the present invention, there is provided a diaphragm having a seal between opening and closing a passage of a fluid and a bottom surface of the housing, so that the diaphragm is expanded and contracted in accordance with movement of the seal associated with the operation of the plunger, The air is moved using the pressure difference generated when the diaphragm is expanded and contracted and the operation speed of the plunger is decreased by using the force due to the pressure difference according to the movement amount of the air moving in the direction opposite to the moving direction of the plunger There is an effect that the amount of impact of the seal hitting the bottom of the housing and the amount of impact of the plunger that hits the inner wall of the housing are reduced to reduce the noise.

In addition, since the force for attenuating the movement speed of the plunger is generated by the movement of the air, not only the safety and accuracy of the plunger operation are ensured, but also when the pressure difference between the upper and lower diaphragms is eliminated by the air movement through the pores after completion of the operation, It is possible to prevent the sealing force of the air bag from dropping.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an outer shape of a noise reducing type canister close solenoid valve according to an embodiment of the present invention; FIG.
2 is a cross-sectional view of a noise-reduced canister close solenoid valve according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a noise-reduced canister close solenoid valve according to an embodiment of the present invention. When the plunger moves in the direction of the core when power is applied, a diaphragm integrally formed with the seal is expanded. Sectional view showing the movement of air.
FIG. 4 is a cross-sectional view of a noise-reduced canister close solenoid valve according to an embodiment of the present invention. FIG. 4 is a cross- sectional view of a diaphragm of FIG. 4 when the plunger is returned by a spring force, Sectional view showing the movement of air through the pores.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. Hereinafter, a noise reducing type canister close solenoid valve according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. For purposes of this specification, like reference numerals in the drawings denote like elements unless otherwise indicated.

Referring to FIGS. 1 and 2, the entire structure of a noise reducing type canister close solenoid valve according to an embodiment of the present invention will be described. Referring to FIG. 3, when power is applied to a solenoid valve, When the diaphragm is moved, the diaphragm integrally formed with the seal expands. By the pressure difference generated when the diaphragm expands, the air moves to the breathing hole to eliminate the pressure difference, and the movement direction of the air is opposite to the operation direction of the plunger Referring to FIG. 4, when the solenoid valve is cut off and the plunger is returned by the spring force, the diaphragm integrally formed with the seal is retracted, The pressure difference generated during contraction of the frame causes the air to be discharged through the pores to relieve the pressure difference, Action face, as opposed to slow the operating speed of the plunger will be described a process of reducing the amount of impact of the plunger.

1 and 2, a noise reducing type canister close solenoid valve 100 according to an embodiment of the present invention includes a bobbin 120 installed inside a housing 110 and having a coil wound on an outer circumferential surface thereof, A plunger 140 coupled to the inside of the bobbin movably in an upward and downward direction, a rod 150 coupled to the plunger and passing through the inside of the bobbin, And a spring 170 that is provided between the core and the plunger and restores the plunger. The spring 160 is disposed between the one end of the seal 160 and the bottom surface of the housing 110 And a diaphragm 180 that expands and contracts according to the operation of the plunger 140. The diaphragm 180 is formed with pores 190 through which air can pass.

Here, the plunger 140 is movably coupled to the inside of the bobbin 120 in an upward and downward direction.

A shock absorber 112 for absorbing the impact of the plunger against the inner wall of the housing when the plunger 140 is moved up and down is coupled to the inner wall of the housing 110 corresponding to the upper portion of the plunger 140.

One end of the plunger 140 has a tapered surface 142 whose width is narrow toward the end and a rod 150 is connected to an end of the tapered surface 142.

The rod 150 protrudes outside the housing 110 through the inside of the core 130 and the seal 160 is coupled to the end of the rod 150 protruding outside the housing 110.

Here, the core 130 is positioned at the lower portion of the plunger 140 and is fixed to the inside of the bobbin 120, and the inner surface of the one end portion corresponding to the plunger 140 is tapered to receive the tapered surface 142 of the plunger 132 are formed.

The diaphragm 180 is integrally formed with the seal 160. More specifically, the diaphragm 180 is integrally formed with the seal 160. The diaphragm 180 is formed with a curved portion 182 that expands and contracts according to the operation of the plunger 140. A fixed end 183 is formed at the edge of the curved portion .

That is, the diaphragm 180 is fixed to the bottom surface of the housing 110 by fixing the fixed end 183 of the curved part in a state where the diaphragm 180 is integrated with the seal 160 and the curved part 182 is formed by the upward and downward movement of the plunger 140, Is expanded and contracted.

One or a plurality of pores 190 are formed in the diaphragm 180.

The pores 190 may be formed at the lower end of the curved portion 182 so as to communicate the inside and outside of the curved portion. Further, the size (diameter) of the pores can be adjusted according to the internal pressure of the curved portion 182, and the number of pores 190 can be adjusted by adjusting the number.

3 and 4, the expansion and contraction of the diaphragm 180 according to the operation of the plunger 140 and the movement of the air through the pores upon expansion and contraction of the diaphragm 180 cause the plunger 140 Will be described in detail.

3, when a current is applied to a coil, the magnetized plunger 140 is moved toward or away from the core 130, and the rod 150 connected to the plunger 140 The seal 160 descends to seal the passage H of the fluid. At this time, the movement of the seal 160 enlarges the curved portion 182 of the diaphragm to secure the internal space, and the pressure of the secured space is reduced.

Therefore, a pressure difference occurs between the inner space of the diaphragm bend section 182 and the outer space, and the air in the outer space is moved to the inner space of the curved section 182 through the pores 190 of the diaphragm 180.

At this time, since the movement of the air moves in the direction opposite to the movement direction of the plunger 140, a force acting in a direction opposite to the movement direction of the plunger 140 due to the pressure difference according to the amount of air movement is generated, The moving speed, that is, the descending speed, is slowed down.

In addition, the plunger 140 with the reduced moving speed is lowered to be inserted into and contacted with one end of the core 130, the spring 170 is compressed, and the seal 160, which seals the passage of the fluid, The impact on the passageway of the < / RTI >

Since the force for attenuating the movement speed of the plunger 140 is generated by the movement of the air, not only the safety and accuracy of the operation of the plunger 140 are ensured, but also the sealing force of the seal 160 Do not drop.

4, when the current is interrupted in the coil, the plunger 140 having lost its magnetizing force is restored to its original position by the restoring force of the compressed spring 170. That is, the plunger 140 is lifted.

The lifting of the plunger 140 causes the seal 160 to move up and down by the rod 150 connected to the plunger 140 to open the passage H of the fluid. At this time, the movement of the seal 160 shrinks the curved portion 182 of the diaphragm and increases the pressure due to the narrowing of the internal space. The air in the interior space of the diaphragm bend portion 182 is moved to the outside space through the pores 190. [

Since the movement of the air moves in a direction opposite to the movement direction of the plunger 140, a force acting in a direction opposite to the movement direction of the plunger 140 is generated by the pressure difference due to the air moving direction, That is, it slows down the rising speed.

When the plunger 140 is moved at a slower speed, the amount of impact of the seal 160 against the bottom surface of the housing 110 is reduced and the amount of impact of the plunger 140 against the inner wall of the housing 110 is reduced, Operation sound corresponding to the operation is not generated.

In addition, the life of the seal 140 can be extended by buffering the shock of the diaphragm 140.

As described above, the diaphragm includes a diaphragm having a breathing hole formed between a seal for opening and closing a fluid passage and a bottom surface of the housing, so that the diaphragm can expand and contract as the seal moves in association with the operation of the plunger. The air is moved using the pressure difference generated during expansion and contraction and the operation speed of the plunger is increased by using the force acting on the diaphragm by the pressure difference according to the movement amount of the air moving in the direction opposite to the movement direction of the plunger The damping reduces the amount of impact of the seal that hits the bottom of the housing and the amount of impact of the plunger that hits the inner wall of the housing to reduce noise. In addition to securing the safety and accuracy of the plunger operation, when the pressure balance between the inside of the diaphragm is made after operation, the sealing force of the seal is not lowered.

 Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims, And equivalents may be resorted to as falling within the scope of the invention.

100: solenoid valve 110: housing
112: Shock absorber 120: Bobbin
130: core 132: tapered surface
140: plunger 141: step
142: tapered surface 150: rod
160: Seal 170: Spring
180: Diaphragm 182:
183: fixed end 190: pores

Claims (5)

A bobbin provided inside the housing and having a coil wound on an outer circumferential surface thereof, a core coupled to one side of the bobbin, a plunger movably coupled to the inside of the bobbin in an upward and downward direction, A seal which is coupled to the rod and opens and closes the passage of the fluid, and a spring provided between the core and the plunger to restore the plunger,
Wherein a diaphragm is provided between a seal for opening and closing the passage of the fluid and a bottom surface of the housing, the diaphragm extending and retracting according to the operation of the plunger, the diaphragm having a pore through which air passes, The pressure acting on the diaphragm is reduced by the pressure difference according to the movement amount of the air that moves in the direction opposite to the plunger moving direction in order to eliminate the pressure difference generated in the plunger movement and the impulse amount of the seal hitting the bottom of the housing Wherein the noise reduction is achieved by reducing the noise by reducing the noise of the canister close solenoid valve. The method according to claim 1,
Wherein one or more of the pneumatic holes are provided in the canister closing solenoid valve. The method according to claim 1,
The diaphragm is integrally formed with the seal. The pore is formed in a curved portion that expands and contracts according to the operation of the plunger. A fixed end formed on a rim of the curved portion is fixed to a bottom surface of the housing, Expansion, and contraction of the cannister-close solenoid valve. The method of claim 3,
And the breathing hole is formed at a lower end of the curved portion. The method according to claim 1,
And a shock absorber for absorbing the impact of the plunger is coupled to the inner wall of the housing corresponding to the upper portion of the plunger.

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