JPH059667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multistage operating diaphragm device. Conventionally used diaphragm devices are configured so that the diaphragm deforms due to fluid pressure fluctuations and its center moves in a direction perpendicular to the surface.This movement of the diaphragm surface causes other components, such as the valve body, to deform. It is designed to drive the stitch mechanism.

However, since the conventional ratio device has only one type of deformation of the diaphragm, the driving pattern obtained by this is limited to one type. However, there was a disadvantage in that it was difficult to perform the flow passage opening/closing operation and the flow passage 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. That is, in the device of the present invention, as shown in FIG.
has a plurality of pressure receiving surfaces 211, 212, and the outer pressure receiving surface 21 of the proportional pressure receiving surfaces 211, 212
1 and the inner wall of the outer casing and between each pressure receiving surface is a flexible surface 21.
3, 214, and the pressure receiving surfaces 211, 212
The actuating portion 30 is connected to a predetermined pressure-receiving surface 212 as a drive pressure-receiving surface as shown in FIG. As a result, the plurality of pressure-receiving surfaces 211 and 212 are individually and sequentially moved in a direction perpendicular to the diaphragm surface by a predetermined pressure value, and each of the pressure-receiving surfaces 211 and 212 is moved in a direction perpendicular to the diaphragm surface. The operating section 30 is configured to perform a predetermined operation. The device of the present invention will be explained below with reference to the accompanying drawings. 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 operation. 40 is a push button part as a starting means provided as desired.

The outer casing 10 includes a fuel gas flow path 11 and a pressure detection path 12 for applying fluid pressure, for example, negative pressure.
This pressure detection path 12 is provided with an inner chamber 13 communicating with it through a through hole 131', and the flow path 11 has a gas inlet 111 and a gas outlet 112 at both ends, and an intermediate portion. For example, it is bent at a right angle.

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, for example. The diaphragm 21 has at least two annular pressure-receiving surfaces 211 and 212 concentrically formed, and the equal pressure-receiving surfaces 211 and 212 are formed with a flexible surface 213 and a return spring 22.
214, they are connected to each other so that they can move independently.

The diaphragm 21 normally has a first flexible surface 213 formed between the inner wall of the outer casing and the outer pressure receiving surface 211 and a second flexible surface 214 formed between the outer pressure receiving surface 211 and the inner pressure receiving surface 212. are formed of a single diaphragm membrane as in the embodiment, and therefore, the outer pressure receiving surface 211 is usually fixedly attached to the diaphragm membrane, but in some cases, a second diaphragm membrane is formed.
As shown in the figure, the first and second flexible surfaces 213 and 214 may be configured as separate bodies, and in this way, the characteristics of the first flexible surface 213 and the second flexible surface 214, for example, the bending strength. The elasticity 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 the drive pressure receiving surface and the other as the auxiliary pressure receiving surface, and the passive member of the actuating part is placed on the drive pressure receiving surface and the auxiliary pressure receiving surface is selected as the auxiliary pressure receiving surface. are each provided with an interlocking member.

In the embodiment, the inner pressure receiving surface 212 is used as a driving pressure receiving surface, and a passive member, that is, the valve mechanism 3 in the embodiment, is connected to the drive pressure receiving surface.
0 valve stem 31 is fixed, and this valve stem 31 has a first valve body 32 for adjustment and a second valve body 33 for opening and closing.
are integrally formed.

Further, on the outer pressure receiving surface 211 selected as the auxiliary pressure receiving surface, there is an engaging piece 215 that engages and interlocks the inner pressure receiving surface 212 when the surface is moved in a predetermined operating direction by fluid pressure. is provided.

Since the auxiliary pressure receiving surface 211 simultaneously moves the inner pressure receiving surface 212 via the engagement piece 215 by the movement of the auxiliary pressure receiving surface 211, the second valve body 33 of the valve stem 31 is moved to the valve seat 34 by the initial movement of the diaphragm 21. Move further away.

The external auxiliary pressure surface 211 is set to be stopped after moving a predetermined distance, and for this purpose, a stopper 23 is provided in the pressure chamber 131 as a means for regulating the movement of the auxiliary pressure receiving surface 211. The movement of the outer pressure receiving surface 211 due to
That is, the lowering operation is stopped at a predetermined position.

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, so that the stopper 23 is placed on the pressure detection path 12 side. An engaging piece 215 serving as the interlocking member engages with the upper surface side of the inner pressure receiving surface 212. When the diaphragm 21 is operated with positive pressure, the stopper 23 and the engaging piece 215 The position of will be opposite. The valve mechanism 30 has a configuration in which the valve stem 31 protrudes into the bent portion of the flow path 11, a second valve body 33 is provided at the protruding end, and the body is molded into the first valve body 32, On the other hand, a valve seat 3 on which the second valve body 33 is attached/detached is provided at the bent portion of the flow path 11.
4 is provided.

In the embodiment shown in FIG. 1, the first valve body 32 is configured to adjust the opening area of the valve seat 34 in two stages, and for this purpose, the first valve body 32 is configured to adjust the opening area of the valve seat 34 in two stages. It has a reduced step directly above it and an enlarged step above this reduced step, and has two different relative equal diameters.
The stepped portion is designed to be alternatively located within the valve seat 34.

The second valve body 33 is also provided with packing 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.

According to this embodiment, therefore, the diaphragm 21
When is driven by pressure, first the outer pressure receiving surface 211, which is the auxiliary pressure receiving surface, moves and moves the second valve body 33 downward in the figure, and then the inner pressure receiving surface 212, which is the driving pressure receiving surface, moves independently. Since the enlarged stepped portion of the valve stem 31 is moved downward into the valve seat 34, the flow path 11 can be opened in the first step, and the open area of the flow path 11 can be reduced in the second step.

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

This push button section 40 includes a push button 41 and a push button 41.
a push rod 42 that is provided in the outer casing 10 and comes into contact with the upper surface of the inner pressure receiving surface 212;
It is equipped with a return spring 43 to isolate this push rod 42 from the diaphragm 21 at all times, and by pressing the push button 41, only the inner pressure receiving surface 212 is lowered, and the valve body 32 is advanced toward the receiving port 111 side. It is configured to do this.

Since the device of the present invention is as described above, for example, the pressure detection path 12 is connected and communicated with the cylinder side from the throttle valve of a general-purpose engine, and the flow path 11
If fuel gas is supplied to the engine via the engine, 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 relation to the opening degree of the throttle valve, in order to supply fuel gas to the engine, the open area of the flow passage 11 is made small when the engine speed is low, but when the engine speed increases, it is necessary to supply fuel gas to the engine. It is necessary to increase the open area of the flow path.

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.
1, as shown in FIG. 3A, the outer pressure receiving surface 211 is lowered until it touches the stopper 23, and then the inner pressure receiving surface 2
12 separates from the outer pressure receiving surface 211 and descends.

Therefore, at this stage, the first valve body 3 of the valve mechanism 30
2, the gas inlet 111 is advanced the most and the flow path 11 is opened narrowly, so the flow rate of gas is small, and the gas corresponding to the initial stage when the opening degree of the throttle valve is small and the negative pressure is large. We can provide supplies.

Next, when the engine speed increases, the negative pressure decreases, so the inner pressure receiving surface 212 rises as the negative pressure decreases as shown in FIG. escapes from the valve seat 34 and the valve seat 3
Increase the open area within 4.

Therefore, at this stage, since the amount of gas supplied increases, it is possible to supply gas suitable for a steady operating state in which the opening degree of the throttle valve is large and the negative pressure is reduced. The inner pressure receiving surface 212 and the outer pressure receiving surface 21
1 can be ensured by the size of the pressure receiving area, the material of the diaphragm membrane, etc. Therefore, while the outer pressure receiving surface 211 is stopped by the stopper 23, the inner pressure receiving surface 212 It is easy to raise and lower only by changing negative pressure. That is, in this embodiment, the second flexible surface 214 is used as a motion regulating means by selecting characteristics such as the amount of deformation and elasticity of the second flexible surface 214 with respect to the inner pressure receiving surface 212 which is the drive pressure receiving surface. .

In the above embodiment, the inner pressure receiving surface 212
A stopper may be provided separately as a means for restricting the movement of the outer pressure receiving surface 211, or the stopper 23 may be unnecessary if the descent of the outer pressure receiving surface 211 is restricted by the amount of deformation of the first flexible surface 213.

In other words, the movement and amount of movement of the pressure receiving surfaces 211 and 212 can be regulated by the characteristics such as the amount of deformation and elasticity of the flexible surfaces 213 and 214.
For example, when the device of the present invention is used for small-sized equipment or equipment for which accuracy is not a big issue, the stopper 23 may not be provided. Therefore, the outer pressure receiving surface 21
1 Used for opening and closing the valve mechanism 30, and the inner pressure receiving surface 21
2 can be used for adjustment when the valve mechanism 30 is opened.

Even if the negative pressure from the engine is sufficient to lower the outer pressure receiving surface 211 but not enough to lower the inner pressure receiving surface 212, the outer pressure receiving surface 21
1 is capable of lowering the inner pressure receiving surface 212 in conjunction with the engagement piece 215, and when the negative pressure from the engine disappears, the inner pressure receiving surface 212 is raised by the return spring 22, so that the outer pressure receiving surface 212 211 is returned by an engagement piece 215 in conjunction with the inner pressure receiving surface 212.

In the above, the device of the present invention may be configured to utilize positive pressure, as shown in FIG. In addition to being advantageous in that the manufacturing cost can be reduced because the diaphragm 21 can be made in the same manner as shown in FIG. In addition, there is an advantage in that the descending distance of the inner pressure receiving surface 212 can also be regulated by the second flexible surface 214, as shown in FIG. 5B.

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.

Since the device of the present invention is as described above, the diaphragm 21 can be sequentially driven in a plurality of stages by the configuration in which the pressure receiving surfaces 211 and 212 of one diaphragm 21 are shifted in stages. In addition to the effect that the actuating section 30 can be operated in a plurality of modes using a diaphragm, one diaphragm device can be used to drive multi-step operations, so there is no need for a separate diaphragm device for each operation. It also has the effect of reducing the manufacturing costs of various conventional devices.

[Brief explanation of the drawing]

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 shown in FIG. 4, respectively. 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, 213 and 214 are flexible 30 indicates a valve mechanism as an operating part.

Claims (1)

[Claims] 1. A diaphragm expanded to form a pressure chamber within the outer casing, a pressure detection path for applying external pressure to the pressure chamber, and an actuating section driven by the deformation action of the diaphragm. The diaphragm has two pressure-receiving surfaces formed concentrically, and a flexible surface is interposed between the pressure-receiving surface outside the proportional pressure-receiving surface and the inner wall of the outer casing and between each pressure-receiving surface. Each of the pressure receiving surfaces is configured to move in a direction perpendicular to the surface of the diaphragm due to pressure changes in the pressure chamber and deformation of the flexible surface, and the inner pressure receiving surface is used as a driving pressure receiving surface, and this driving pressure receiving surface is A stopper is provided opposite to the outer pressure receiving surface for regulating the amount of movement of the pressure receiving surface in the direction of movement, and the driving pressure receiving surface is configured to drive the actuating portion by the outer pressure receiving surface. A return spring is attached to the outer pressure-receiving surface for fixing the surface at the same height as the outer pressure-receiving surface, and the outer pressure-receiving surface extends from the surface to the drive pressure-receiving surface, and the drive pressure-receiving surface is attached to the return spring. An engaging piece is provided that locks against the movement of the outer pressure receiving surface, and when the outer pressure receiving surface moves, the driving pressure receiving surface moves in conjunction with the outer pressure receiving surface to the stopper position, while when the driving pressure receiving surface returns, the above described driving pressure receiving surface moves in conjunction with the outer pressure receiving surface. The outer pressure receiving surface is configured to return in conjunction with the drive pressure receiving surface, and after the outer pressure receiving surface is stopped by the stopper, the drive pressure receiving surface leaves the engagement piece and independently resists the return spring. 2. A diaphragm device, characterized in that the actuating section is configured to perform a predetermined operation by being driven by the shifting operation of the driving pressure receiving surface of the diaphragm.