JPS6040880A - Diaphragm device - Google Patents

Abstract

PURPOSE:To enable a multistage action, by providing flexible surfaces between plural concentric pressure-receiving surfaces. CONSTITUTION:A diaphragm 21 has at least two annular pressure-receiving surfaces 211, 212 concentric to each other. The pressure-receiving surfaces 211, 212 are coupled with flexible surfaces 213, 214 so that the pressure-receiving surfaces can be moved independently of each other. The valve spindle 31 of a valve mechanism 30 is secured to the inner pressure-receiving surface 212, which is used as a driving pressure-receiving surface. The outer pressure-receiving surface 211, which is used as an auxiliary pressure-receiving surface, is fitted with an engaging member 215, which engages the inner pressure-receiving surface 212 with the outer pressure-receiving surface for their interlocked motion when the outer one is moved in a prescribed operating direction by the pressure of a fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multistage operation type tire flam device.

Conventionally used diaphragm devices are configured such that the diaphragm deforms due to fluid pressure fluctuations and its center portion moves in a direction perpendicular to the surface.This movement of the diaphragm surface causes other components, such as the valve body, to deform. Designed to drive a switch mechanism.

However, in conventional devices of this kind, the diaphragm was deformed in one way, so the driving mode obtained thereby was limited to one type. road opening/closing operation,
There is a disadvantage in that it is difficult to perform the flow path opening area adjustment operation using a single diaphragm.

The present invention aims to provide a multi-stage operating diaphragm device that can eliminate such disadvantages.

Referring to the attached drawings of the device of the present invention fii8, Fig. 1 is a longitudinal cross-sectional view of the device of the present invention used in a fuel gas supply pipe system, in which 10 is the outer casing, 20 is the diaphragm mechanism, and 30 is the The valve mechanism 40 is an actuating part, and the push button part 40 is a starting means provided as desired.

The outer casing 10 includes a fuel gas flow path 11, a pressure detection path 12 for applying fluid pressure, for example, negative pressure, and this pressure detection path 1.
An inner chamber 13 communicating with the upper HC flow path 11 is provided.
The gas inlet 111 and the gas outlet 112 are formed at both ends, and the middle portion is bent at a right angle, for example.

The diaphragm mechanism 20 includes a diaphragm 21 expanded to form a pressure chamber 131 communicating with the pressure detection path 12 in the inner chamber 13, and a return means for holding the diaphragm 21 in a predetermined position during normal operation. To is a return spring 22
and the diaphragm 21 has at least two
The annular pressure receiving surfaces 211 and 212 are formed concentrically, and the pressure receiving surfaces 211 and 212 are formed into flexible surfaces 213 and 21.
4 are connected to each other so that they can move independently.

The diaphragm 21 is usually connected to the inner wall of the outer casing and the outer pressure receiving surface 2.
11 and a second flexible surface 213 formed between the outer pressure receiving surface 211 and the inner pressure receiving surface 212.
As in the embodiment, the flexible surface 214 is formed of a single diaphragm membrane, and therefore the outer pressure receiving surface 211 is normally fixedly fixed to the diaphragm membrane, but in some cases, as shown in FIG. As in 1st above. Second flexible surface 213, 21
4 may be configured separately, and in this way, the first flexible surface 2
13 and the second flexible surface 214, such as their bending strength and elasticity, can be selected separately.

One of the outer pressure receiving surface 211 and the inner pressure receiving surface 212 is selected in advance as a driving pressure receiving surface and the other as an auxiliary pressure receiving surface, and the driving pressure receiving surface lζ is used as a passive member of the actuating part and as an auxiliary pressure receiving surface. are each provided with interlocking members.

In the embodiment, the upper H inner pressure receiving surface 212 is used as a drive pressure receiving surface, and a passive member, that is, the valve stem 31 of the valve mechanism 30 in the embodiment, is connected to the drive pressure receiving surface.
is fixed, and this valve stem 31i is integrally formed with a first valve body 32 for adjustment and an f42 valve body 33 for opening and closing.

Also, the outer pressure receiving surface 2 selected as the auxiliary pressure receiving surface
11 is provided with an engagement piece 215 that engages and slows down the inner pressure receiving surface 212 when the surface is moved in a predetermined operating direction by fluid pressure.

The auxiliary pressure receiving surface 211 is moved by the engaging piece 21.
5, the inner pressure receiving surface 212 is also moved at the same time.
The initial movement of the diaphragm 21 causes the second valve body 33 of the valve stem 31 to separate from the valve seat 34 .

The auxiliary pressure receiving surface 211 is set to be stopped after moving a predetermined distance, and for this purpose the pressure chamber 13 is
11 is provided with a stopper 23, and this stopper 23
As a result, the movement of the outer pressure-receiving surface 211, that is, the lowering operation, is stopped at a predetermined position J.

In the embodiment, negative pressure is applied to the diaphragm 21, and the center of the diaphragm 21 is set to move downward in the figure when negative pressure is detected.
3 is provided on the pressure detection path 12 side, while the retaining piece 215 as the interlocking member engages with the upper surface side of the inner pressure receiving surface 212. However, when the diaphragm 21 is operated with positive pressure, the above The positions of the stopper 23 and the retaining piece 215 are opposite to each other. The valve mechanism 3o connects the valve stem 31 to the flow path l.
The bent part l of l protrudes, and a second valve body 3 is attached to this protruding end.
3, and the body is molded into a first valve body 32. On the other hand, a valve seat 34 on which the second valve body 33 is attached and detached is provided at the bent part of the flow path 1. .

In the embodiment shown in FIG.
The first valve body 32 is configured to adjust the open area in two stages, and for this purpose, the first valve body 32 has a reduced step section directly above the second valve body 33, and an enlarged step section above this mlJX step section. The valve seat 3 can be selectively connected to the two stages with different diameters.
It is designed to be placed in the 4th position.

Further, the upper Wb second valve element 33 is provided with a backing on the side that contacts the valve seat 34, so that it closes the flow path 11 when it comes into contact with the valve seat 34.

Therefore, according to this embodiment, when the diaphragm 21 is driven by pressure, the outer pressure receiving surface 211, which is the auxiliary pressure receiving surface, moves first to move the second valve body 33 downward in the figure.
Next, the inner pressure receiving surface 212, which is the drive pressure receiving surface, moves down independently to move the enlarged stepped portion of the valve stem 31 into the valve seat 34, so that the flow path 11 is opened in the first step, and the flow path is closed in the second step. 11
The open area can be reduced.

The push button section 40 can be moved to the valve mechanism 30 by external operation when desired.
It is used to open the valve by a predetermined amount, and is used, for example, to start the engine.

This push button part 40 is provided with a push button 41 and the push button 41 and protrudes into the outer casing 10 to connect to the inner pressure receiving surface 212.
It is equipped with a push rod 42 that contacts the upper surface and a return spring 43 for always isolating the push rod 42 from the diaphragm 21, and by suppressing the push button 41, only the inner pressure receiving surface 212 is lowered. , the valve body 32 is configured to extend toward the receiving port 111 side.

For example, if the pressure detection path 12 is connected to the cylinder side of a general-purpose engine from the throttle valve, and fuel gas is supplied to the engine through the flow path 11, The amount of gas supplied can be automatically adjusted by the negative pressure obtained from the engine.

Here, when the engine speed is low, the opening of the throttle valve is small and the negative pressure is large, and as the speed increases, the opening of the throttle valve increases and the negative pressure decreases. Therefore, in order to supply fuel gas to the engine in relation to the opening degree of the throttle valve,
While the open area of the flow path 11 is made small when the engine speed is low, it is necessary to increase the open area of the flow path when the engine speed increases.

In the device of the present invention, when gas is supplied to the engine and ignited using the push button part 40 at the time of starting, the engine starts operating and a large negative pressure acts on the diaphragm 21, so the diaphragm 21 is As shown in FIG. 2, the outer pressure receiving surface 211 descends until it comes into contact with the stopper 23, and then the inner pressure receiving surface 212 separates from the outer pressure receiving surface 211 and descends.

Therefore, at this stage, the first valve body 32 of the valve mechanism 30 advances farthest into the gas inlet 111 to narrowly open the flow path 11, so the flow rate of gas decreases and the opening degree of the throttle valve decreases. It is small and can supply gas corresponding to the initial stage where negative pressure is large.

Next, when the engine speed increases, the negative pressure decreases, so that the inner pressure receiving surface 212 is exposed to the reduced negative pressure as shown in FIG. 3B.
As a result, the enlarged stepped portion of the first valve body 32 escapes from the valve seat 34, and the valve seat 34 gas supply adapted to the steady operating state where the opening degree of the throttle valve is large and the negative pressure is reduced. There will be a small school that will do this.

The stepwise movement of the inner pressure receiving surface 212 and the outer pressure receiving surface 211 is stopped by the stopper 23 due to the force that can be guaranteed depending on the size of the pressure receiving area, the material of the diaphragm membrane, etc. In this state, it is easy to move only the inner pressure receiving surface 212 up and down by fluctuations in negative pressure.

Therefore, the outer pressure receiving surface 211 can be used for opening and closing the valve mechanism 30, and the inner pressure receiving surface 212 can be used for adjusting the opening of the valve mechanism 30.

Although the negative pressure of the engine sinker 1 and others is sufficient to lower the outer pressure receiving surface 211, even if it is insufficient to lower the inner pressure receiving surface 212, the outer pressure receiving surface 211 is moved by the engaging piece 215.
When the negative pressure from the engine disappears, the inner pressure receiving surface 212 is raised by the return spring 22 due to the force 1.
Furthermore, the outer pressure receiving surface 211 is returned to its original position in conjunction with the inner pressure receiving surface 212 by the engagement piece 215.

In the above, the device of the present invention may be configured to utilize positive pressure as shown in FIG. In addition to the benefit of being able to reduce the manufacturing cost due to the force that can be created as shown in FIG. There is an advantage in that it is possible to control the downward distance of the inner pressure receiving surface 212 by resting on the second flexible surface 214, as in lζ, fE5 prisoner B.

Furthermore, the diaphragm 21 of the device of the present invention may also have a driving function on its outer pressure receiving surface 211, and in this case, the outer pressure receiving surface 211 can also drive a separate operating section.

Furthermore, the diaphragm 21 may have three or more pressure receiving surfaces, and the number of pressure receiving surfaces can be increased within a designable range.

The device of the present invention has the advantage of being able to perform multi-stage operations using a single diaphragm 21.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the device of the present invention, FIG. 2 is a longitudinal sectional front view showing another embodiment of the diaphragm of the same device, FIG. 3 is a longitudinal sectional front view showing the operation of the device of the invention, and FIG. 5 is a longitudinal sectional front view showing another embodiment of the apparatus of the present invention, and FIG. 5 is a longitudinal sectional front view showing the operation of the apparatus of the invention roughly shown in FIG. In the figure, 10 is an outer casing, 131 is a pressure chamber, 20 is a diaphragm mechanism, 21 is a diaphragm, 211 is an outer pressure receiving surface as an auxiliary pressure receiving surface, 212 is an inner pressure receiving surface as a drive pressure receiving surface, 213j and 214 are flexible surfaces, respectively. , 30 indicates a valve mechanism as an operating part. Patent applicant Tokyo Rika Kogyo Co., Ltd. Agent Seiji Matsuda Figure 1 3311 Figure 2 1

Claims (1)

[Scope of Claims] 1. A diaphragm expanded to form a pressure chamber within the outer casing, a pressure detection path for applying external pressure to the upper H pressure chamber, and a deformation operation of the diaphragm. The diaphragm has a plurality of concentric pressure-receiving surfaces, and a flexible surface is interposed between the pressure-receiving surfaces, and each of the pressure-receiving surfaces has a plurality of pressure-receiving surfaces. The deformation of the flexural surface is configured to sequentially move in a direction perpendicular to the surface of the diaphragm, and the predetermined pressure-receiving surface is used as a driving pressure-receiving surface, and the actuating portion is configured to be driven above this driving pressure-receiving surface. A diaphragm device characterized in that the plurality of pressure-receiving surfaces are sequentially moved in a stepwise manner according to pressure changes in the pressure chambers, and the upper R operating portion is thereby driven in a stepwise manner. 2. The diaphragm device according to claim 1, wherein the drive pressure receiving surface is formed at the center of the diaphragm. 3. The diaphragm device according to claim 1, characterized in that a plurality of said drive pressure receiving surfaces are set, so that a plurality of actuating parts are sequentially driven one step at a time. 4. The diaphragm device according to claim 1, wherein the diaphragm is configured to operate when negative pressure is applied thereto. 5. The diaphragm device according to claim σ), paragraph 1, characterized in that the diaphragm is configured to operate when positive pressure is applied thereto. 6. The plurality of pressure receiving surfaces are provided with interlocking members that act from the pressure receiving surface that operates in advance to the pressure receiving surface that operates subsequently, so that when the pressure receiving surface that operates in advance moves, the pressure receiving surfaces that perform subsequent operation are interlocked. The diaphragm device according to claim 1, characterized in that the diaphragm device is configured so that the diaphragm device 7. 7. The diaphragm device according to claim 6, wherein the interlocking member is a retaining piece.