JP2585987Y2 - On-off valve device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve device which can reduce noise when seated.

[0002]

2. Description of the Related Art As an example, Japanese Utility Model Laid-Open Publication No. 50-85830 discloses a two-way valve having two valves combined inside and outside. Of these, the outer valve can be seated on a valve seat formed on the case side at a predetermined set pressure by a valve spring, and a lip is formed at a portion that comes into contact with the valve seat.

[0003]

[Problems to be Solved by the Invention] By the way, such a lip generally has only one protrusion,
When the seat is seated from the fully opened state where the valve lift is large, a relatively large noise may be generated at the time of seating because the return force of the valve spring is large (hereinafter, this is referred to as a large noise). In addition, when the internal pressure on the high pressure side becomes close to the set pressure of the valve spring, the valve repeatedly opens and closes, and the lip frequently comes into contact with the valve seat, so that a relatively small and small rattling noise is generated. (Hereinafter, this is referred to as wiggly noise.) Therefore, it is desired to reduce these noises. The purpose of this application is to satisfy such a requirement.

[0004]

In order to solve the above problems SUMMARY OF THE INVENTION The open closing device, the valve valve (2,17,22) is formed in the communicating portion between the high pressure side and the low-pressure side seat (1
2) Seating from the low pressure side at a predetermined set pressure by the valve springs (9, 18, 29) , and setting the high pressure side to the set pressure.
In an on- off valve device that opens and closes due to pressure fluctuation , a valve (2,
17, 22) are valve springs (9, 18, 29)
(2a, 17a, 2)
2a) and a substantially ring-shaped elastic attached to the base
A valve (10, 10a, 10b) made of a member, and the valve
(10, 10a, 10b) around the valve seat (1
Incline and project while expanding outward to 2)
The ring-shaped lips (13, 14) are formed in at least two steps of concentric circles inside and outside, and the outer lip (1
4) Make the protruding height higher than the inner lip (13) ,
The space between the inner and outer lips (13, 14) is an elastically deformable portion (16) thinner than each lip , and the outer lip (14 ) is formed with a communication passage (15) through which fluid can pass even when seated. Features.

[0005]

According to the present invention, when the valve is closed, the outer lip having a high protruding height is seated first, and the inner lip having a low protruding height is seated later. So sit first
The outer lip has a large diameter, so the contact area when sitting is
Large, relatively low contact pressure and thin, easy-to-use bullet
The part that connects to the inner lip at the sex deformation part and sits on it
The part expands to open outwards, and part is divided by a communication passage
It is easily elastically deformed when seated. others
The shock when seated is reduced, and when the outer lip is seated
The noise in the signal is extremely small. Meanwhile, the inside
Because the lip is smaller in diameter than the outer lip,
Small contact area, sufficient contact for reliable valve closing
Seats with pressure but has a lower protruding height than the outer lip
Seated late after the outer lip seated, and
Seat while elastically deforming the elastically deformable part,
By taking a relatively long time until the seat , generation of large noise is suppressed. Also, close to the set pressure on the high pressure side.
Outer lip seated for small pressure fluctuations
Only the inner lip sits or separates as it is, at the time of leaving
Fluid movement is ensured by the communication passage formed in the outer lip
The valve is opened. Therefore, under such conditions
However, since it is difficult for the valve as a whole to rattle, generation of small noise is also suppressed.

[0006]

1 to 3 show a first embodiment constructed as a fuel vapor prevention valve for an automobile. Inside the case 1 is a tank chamber 4 communicating with the fuel tank connection pipe 3 by a valve 2.
And a canister chamber 6 communicating with the canister connection pipe 5. The canister chamber 6 is open to the atmosphere and has a substantially constant internal pressure. In addition, tank room 4
Can be changed between a positive pressure state higher than the internal pressure (atmospheric pressure) of the canister chamber 6 and a negative pressure state lower than the internal pressure of the canister chamber 6.

The base 2a is urged toward the canister chamber 6 at a predetermined set pressure by a valve spring 7, and can be opened when the internal pressure of the tank chamber 4 is a negative pressure. And a large-diameter positive pressure valve 10 that is urged toward the tank chamber 4 at a predetermined set pressure and can be opened when the internal pressure of the tank chamber 4 is positive. A communication hole 11 for communicating the tank chamber 4 with the canister chamber 6 is provided at the center of the positive pressure valve 10.
When the negative pressure valve 8 is pressed against the positive pressure valve 10 side, the communication hole 11 is closed.

The outer periphery of the positive pressure valve 10 can be in close contact with a valve seat 12 formed in the tank chamber 4, and at this time, communication between the tank chamber 4 and the canister chamber 6 is cut off. An inner lip 13 and an outer lip 14 are formed inside and outside of a portion of the positive pressure valve 10 which can be seated on the valve seat 12.

FIG. 2 is a plan view showing the positive pressure valve 10 from below in FIG.
Are substantially concentrically formed in two steps inside and outside. However, the communication path 1 cut out at equal intervals is formed on the outer lip 14.
5 are formed. The communication path 15 is a valve spring 9
When the internal pressure of the tank chamber 4 becomes slightly higher than the set pressure of the tank chamber 4, the tank chamber 4 communicates with the canister chamber 6.

FIG. 3 is an enlarged cross-sectional view of the inner and outer lip portions corresponding to the portion A in FIG. 1 in a state in which only the outer lip 14 is seated. The protruding height of the lip 13 and the outer lip 14 is higher by h on the outer side than on the inner side.
The connecting portion formed between the two lips 13 and 14 has a valley shape, and forms an easily elastically deformable portion 16 which is thinner than the two lips 13 and 14. When the internal pressure of the tank chamber 4 becomes positive and slightly exceeds the set pressure of the valve spring 9, the positive pressure valve 10 slightly moves against the valve spring 9, and only the inner lip 13 moves the valve seat 12. And the outer lip 14 remains seated.
In this state, the tank chamber 4 and the canister chamber 6 communicate with each other through the communication path 15 formed in the outer lip 14, and a small amount of fluid (fuel gas) can move.

Next, the operation of this embodiment will be described. First,
When the internal pressure of the tank chamber 4 is much smaller than the set pressure of the valve spring 9 in the positive pressure state of the tank chamber 4,
The positive pressure valve 10 is in a closed state, is pushed toward the tank chamber 4 by the valve spring 9, and the inner lip 13 and the outer lip 14 are pressed against the valve seat 12, respectively. Further, the negative pressure valve 8 is pressed against the positive pressure valve 10 by the valve spring 7 to close the communication hole 11. Therefore, the tank 2 and the canister chamber 6 are completely disconnected from each other by the valve 2.

Next, when the internal pressure of the tank chamber 4 is increased to a level slightly exceeding the pressure set by the valve spring 9,
Since the positive pressure valve 10 is slightly pushed toward the canister chamber 6, only the inner lip 13 is separated from the valve seat 12. At this time, the outer lip 14 remains seated, but the communication path 15 connects the tank chamber 4 and the canister chamber 6, and the fuel gas in the tank chamber 4 flows into the canister chamber 6. Thereafter, when the internal pressure of the tank chamber 4 becomes lower than the set pressure, the inner lip 13 is seated again. In this seating, since the outer lip 14 is seated in advance, only the inner lip 13 is seated slowly and quietly while elastically deforming the easily elastic deformable portion 16. For this reason, the valve spring 9
Although the opening and closing of the inner lip 13 in the vicinity of the set pressure may occur relatively frequently, rattling noise is less likely to occur, and the generation of small noise is suppressed.

Further, when the internal pressure of the tank chamber 4 rises above the set pressure of the valve spring 9 and overcomes the elasticity of the valve spring 9, the entire positive pressure valve 10 is largely pushed toward the canister chamber 6, so that the inner lip 13 and the outer lip 14 are simultaneously disengaged from the valve seat 12 and are fully open to allow a relatively large amount of fluid transfer from the tank chamber 4 to the canister chamber 6.

When the internal pressure of the tank chamber 4 is reduced from the fully opened state and becomes lower than the set pressure of the valve spring 9, the positive pressure valve 10 is pushed back toward the tank chamber 4, and only the outer lip 14 is first moved to the valve seat 12. To sit down. At this time, the impact at the time of sitting is alleviated by the elastic deformation of the easily elastic deformable portion 16 to be connected. Subsequently, the inner lip 13 is seated with a delay while elastically deforming the easily elastic deformable portion 16. Easy elastic deformation portion 16 that also connects the seat of this inner lip 13
The shock is alleviated by the elastic deformation of.

The lip 13 and outer lip 14 inside the thus does not seated at the same time, it will be seated on soft over a relatively time. Further, if the inner lip 13 is regarded as a conventional lip, the outer lip 14, which is another lip, is provided outside the lip 13, so that the range of contact with the valve seat 12 as the lip as a whole is reduced. The contact area is increased by dispersion. Therefore, generation of a large noise at the time of sitting is suppressed.

[0016] Moreover, the inner lip 13 is the outer lip
14 and smaller when seated on the valve seat 12
The contact pressure is high and a reliable seal can be secured when the valve is closed.
Therefore, although the generation of the noise can be suppressed,
Operation reliability can be maintained by securing a sufficient contact pressure.

In the fully closed state, the inside of the tank chamber 4 becomes a negative pressure. When the degree of the negative pressure (absolute value) exceeds the set pressure of the valve spring 7, the negative pressure valve 8 is pushed into the tank chamber 4. The communication hole 11 opens, and the canister chamber 6 and the tank chamber 4 communicate with each other.

[0018] In the present embodiment in this manner, the inside of the lip 1
3 and two of the outer lip 14 are provided in two steps inside and outside,
In addition, since the projecting height of the outer lip 14 is higher than that of the inner lip 13, it is possible to suppress small noise due to rattling noise when the internal pressure of the tank chamber 4 is close to the set pressure, and the positive pressure valve 10 in the fully opened state Generation of a large noise at the time of sitting when the is fully closed can be reduced. Therefore, noise can be reduced as a whole.

FIG . 4 shows a second embodiment constructed as a one-way valve. The check valve 17 is urged by a check spring 18 so that the inner lip 13 and the outer lip 14 are seated on the valve seat 12. Has become. A communication path 15 is also formed in the outer lip 14. Even in this case, the occurrence of large noise and small noise can be reduced just like the previous embodiment. Note that the same reference numerals are used for the same functional portions as those in the previous embodiment (the same applies hereinafter). Reference numeral 10a denotes a positive pressure valve, and 17a denotes a base.
- scan, 19 housing, 19a is a high-pressure side passage, 19b
Is a high pressure chamber, 19c is a low pressure chamber, and 19d is a low pressure side passage.

FIG . 5 shows a third embodiment constructed as a solenoid valve. In this example, a valve 22 is provided at the tip of a plunger 21 that can move forward and backward by a solenoid 20. Around the valve 22, inner and outer lips 13, which can be seated on the valve seat 12, as in the previous embodiments,
14 and an inlet 2 provided in the housing 23.
A passage 26 communicating the nozzle 4 and the discharge port 25 can be connected and disconnected by the valve 22. A communication path 15 is also formed in the outer lip 14. Reference numeral 10 denotes a positive pressure valve, 22a denotes a base,
27 is an inlet-side fluid chamber, 28 is an outlet-side fluid chamber , 29 is
It is a valve spring . The function of the inner lip 13 and the outer lip 14 of the solenoid valve thus configured is exactly the same as in the previous embodiments.

[0021]

According to the present invention , at least two inner and outer lips are formed concentrically at the seating portion of the valve and the protruding height of the outer lip is made higher than that of the inner lip. Then the inner lip sits down . Therefore, the outer lip seated first has a large diameter
Because the contact area when sitting is large, a relatively small contact pressure and
And connected to the inner lip with a thin-walled easily deformable part
And the part to be seated expands to open outward
Partly separated by a communication passage so that it can be easily
Elastically deform. As a result, the impact at the time of sitting is reduced,
Very low noise when the side lip is seated
Can be On the other hand, the inner lip is
The contact area when seated is smaller because the diameter is smaller than
Seats with sufficient contact pressure to ensure valve closing,
The outer lip is worn because the protruding height is lower than the outer lip
Sitting late after sitting, and elastically deforming the easily elastic deformable part
It is relatively long until you sit down
By taking time, the generation of large noise can be suppressed. In addition, small pressure fluctuations near the set pressure on the high pressure side
If the outer lip is still seated, the inner lip
Only seats or unseated, forms on outer lip when unseated
The valve is in the open state where fluid movement is secured by the
You. Therefore, even in such a condition, the entire valve
Therefore, the occurrence of small noise can be suppressed.

[Brief description of the drawings]

FIG. 1 is a full sectional view according to a first embodiment.

FIG. 2 is a plan view of a main part of the first embodiment.

FIG. 3 is an enlarged sectional view of a portion corresponding to a portion A in FIG. 1;

FIG. 4 is a partially cutaway sectional view according to a second embodiment.

FIG. 5 is a partially cutaway sectional view according to a third embodiment.

[Explanation of symbols]

 2 Valve 9 Valve spring 10 Positive pressure valve 12 Valve seat 13 Inner lip 14 Outer lip 15 Communication path 16 Elastic deformation part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidefumi Noguchi 1000, Otagaya, Tsurugashima-cho, Iruma-gun, Saitama Toyodenso Co., Ltd. Inside the Tsurugashima Plant 60-44174 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 1/34-1/36 F16K 17/04 F16K 47/02

Claims (1)

(57) [Scope of request for utility model registration] A valve (2, 17, 22) is connected to a valve seat (12) formed in a communicating portion between a high pressure side and a low pressure side, and is set to a low pressure side at a predetermined set pressure by a valve spring (9, 18, 29). seated from the pressure fluctuations in the high-pressure side with respect to the set pressure
In the on- off valve device that opens and closes with a valve, the valve (2, 17, 22) is provided with a valve spring (9,
18, 29) biased in the valve closing direction by the base (2
a, 17a, 22a) and the abbreviation attached to this base.
Valves (10, 10a, 10) made of a ring-shaped elastic member
b) and a valve around this valve (10, 10a, 10b)
Tilting toward the seat (12) while expanding outward
Ring-shaped lips (13, 14) projecting at an angle
At least two inner and outer concentric circles are formed and the outer lip (14) has a protrusion height of the inner lip (1).
3) higher than the inner and outer lips (13, 14)
An elastically deformable portion (16) that allows fluid to pass through even when seated on the outer lip (14).
An on-off valve device comprising a passage (15) .