JPH0716167Y2 - Governor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a governor for controlling the flow of a fluid from a primary pressure side to a secondary pressure side, and more specifically, no pressure fluctuation occurs with respect to a flow rate change on the secondary pressure side. About the governor.

[0002]

2. Description of the Related Art The basic structure of a direct-acting single-valve governor that is incorporated in a supply path for gas or the like and automatically controls the flow rate by fluctuations in secondary pressure will be described with reference to FIG.

In FIG. 6, a port 5 is provided in a partition wall 4 that divides the inside of the valve box 1 into a primary pressure side 2 and a secondary pressure side 3, and a pressure chamber 7 of a diaphragm device 6 arranged above the valve box 1 is adjusted. The pipe 8 is connected to the secondary pressure side 3, and the diaphragm 9 and the valve body 10 located on the secondary pressure side of the port 5 are interlocked by the spindle shaft 11, and the spring 1 is provided in the back pressure chamber 12 of the diaphragm 9.
3 and a weight 14 are incorporated as needed.

Since the pressure on the secondary pressure side 3 is introduced into the pressure chamber 7 of the diaphragm 9, if the gas pressure acting on the diaphragm 9 and the force of the spring 13 are balanced, the valve body 10 is constant. And the fixed amount of gas flows from the port 5 to the secondary pressure side 3.

When the demand for gas increases from this state, the pressure on the secondary pressure side 3 decreases, so the upward force acting on the diaphragm 9 decreases, the force of the spring 13 overcomes, and the valve body 10 opens. It moves and the amount of gas increases until the secondary pressure side 3 reaches a predetermined pressure.

On the contrary, when the gas demand decreases, the secondary pressure side 3
Since the pressure rises, the upward force acting on the diaphragm 9 increases, overcoming the force of the spring 13 to move the valve body 10 in the closing direction, and the gas amount decreases to a predetermined pressure.

By the way, in the direct-acting single-valve governor as described above, as shown by the alternate long and short dash line in the graph of FIG. 4, the ideal secondary pressure is always constant even if the flow rate changes. It must be possible to obtain line (A).

However, in the direct acting governor, the secondary pressure is larger than the ideal secondary pressure line (A) when the flow rate increases due to the influence of the shape of the spring 13, the diaphragm 9 and the valve box 1 and the primary pressure. It tends to fall below.

That is, as shown in FIG. 4, when the secondary pressure is influenced by the spring 13 (B), the diaphragm 9 is further affected.
(C), when these are affected by the shape of the valve box 1 (D), the pressure sequentially decreases.

In order to solve the problems with the governor having the above-described direct-acting single valve structure, the secondary pressure is applied to the valve body in both the opening and closing directions, and the secondary pressure is applied. A governor that attempts to improve stability against fluctuations in the flow rate is proposed, for example, in Japanese Utility Model Application Laid-Open No. 57-140412.

As shown in FIG. 7, this conventional governor is the same as the governor of the direct-acting single-valve structure shown in FIG.
The space between the primary pressure side 2 and the pressure chamber 7 of the diaphragm device 6 is partitioned by a balance diaphragm 31.
1 and a spindle shaft 11 penetrating therethrough in the axial direction are connected.

In the conventional governor as described above,
The primary-side pressure acts on the valve element 10 in the valve opening direction and acts on the balance diaphragm 31 in the valve closing direction. In this way, the primary flow rate is changed to the valve element 10 and the balance diaphragm 3.
Balance by acting in the opposite direction of 1,
The stability of the valve body 10 due to the fluctuation of the secondary flow rate is improved.

[0013]

By the way, in such a governor, depending on the opening / closing degree of the port 5 by the valve body 10, the condition of fluid outflow to the secondary side also changes. Although the pressure in the valve direction also fluctuates, the balance diaphragm 31 that works with the valve body 10 is directly connected to the primary pressure side 2 as in the conventional governor described above.
In this structure, the primary pressure directly acts on the diaphragm 31, the pressure acting in the valve closing direction of the valve element 10 becomes constant, and the pressure change in the valve opening direction cannot follow. However, there is a problem that it is not possible to reduce the fluctuation amount of the secondary pressure due to the fluctuation of the secondary flow rate.

Therefore, in order to solve the above problems, the present invention does not lower the secondary pressure with respect to the change in the secondary flow rate, and the responsiveness of the valve body due to the variation in the secondary pressure is good. It is intended to provide the governor.

[0015]

In order to achieve the above-mentioned object, the present invention has a valve body for opening and closing a port provided between a primary pressure side and a secondary pressure side of a fluid passage on the secondary pressure side. And a diaphragm device that communicates the pressure chamber with the secondary pressure side .
The diaphragm valve body by the pressure variation of the secondary pressure side through the spindle shaft so as to control the opening of the port communicated
In dynamic the governor, in the middle position of the spindle axis, a hollow chamber delimited between the primary pressure side with the spindle shaft axially penetrating provided in the hollow chamber, back hollow chamber
A balance diaphragm that is divided into a pressure chamber and a pressure chamber and is linked to the spindle shaft is installed, and the tip opening of the boost pipe that is connected to the pressure chamber of the hollow chamber is made to face the primary pressure side of the port part. It was done.

[0016]

[Operation] The primary pressure acting on the valve element is applied to the balance diaphragm by the boost pipe to balance the primary pressure acting on the valve element and the balance diaphragm, and the pressure acting on the balance diaphragm when the valve is opened is secondary by the boost pipe. The pressure on the secondary side is increased by boosting to the pressure side and damping the force in the valve closing direction that acts on the valve element.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings. The same parts as those of the direct-acting single valve governor shown in FIG.

In the direct-acting single-valve governor shown in FIG. 1, a balance diaphragm device 21 is provided in the middle of the spindle shaft 11, and the primary pressure in the valve opening direction acting on the valve body 10 is supplied to the diaphragm device 21. By acting the primary pressure in the valve closing direction of the valve element 10, the pressures acting on the valve element 10 in the valve opening direction and the valve closing direction are balanced.

The balance diaphragm device 21 is shown in FIG.
As shown in FIG. 3, a hollow chamber separated from the primary pressure side 2 is provided, a large diameter portion 22 is provided on the spindle shaft 11 penetrating the hollow chamber, and the hollow chamber is provided with an upper back pressure chamber 23 and a lower pressure chamber. A part of the balance diaphragm 25 that divides into the chamber 24 is overlapped from the bottom surface of the large diameter portion 22 to the side surface and interlocks with the spindle shaft 11 to reduce the number of the compo- nent portions 26 in the balance diaphragm 25.

Pressure chamber 2 of the balance diaphragm 25
4 and the area of the port 5 are formed to be the same, and the number of the compo- nent portions 26 is small, the fluid acting area of the balance diaphragm 25 changes when the valve of FIG. 2 is closed and when the valve of FIG. 3 is opened. There is no such thing.

A boost pipe 27 provided so that its upper end communicates with the pressure chamber 24 of the balance diaphragm device 21.
The lower end opening faces the inside of the port 5 on the primary pressure side 2 and maintains a slight gap above the valve body 10 in the valve closed position as shown in FIG.

The boost pipe 2 is provided in the lower pressure chamber 24.
7, the primary pressure flows in, the secondary pressure flows in from the pressure chamber 7 of the diaphragm 9 into the upper back pressure chamber 23, and when the valve is closed, the primary pressure acting on the valve body 10 and the balance diaphragm 25 is increased. They are in balance.

When the pressure on the secondary pressure side 3 decreases in the above-mentioned valve closed state, the pressure in the pressure chamber 7 of the diaphragm 9 also drops, and the pressing force of the spring 13 moves the valve body 10 together with the spindle shaft 11 in the valve opening direction. Then, the port 5 opens as shown in FIG. 3, and the primary side fluid flows out to the secondary side through the port 5.

When the valve body 10 is opened and the flow velocity of the port 5 increases, a suction action occurs at the tip of the boost pipe 27, and the pressure fluid in the pressure chamber 24 of the balance diaphragm 25 is sucked.

Therefore, the fluid in the pressure chamber 24 of the balance diaphragm 25, which has been acting in the valve closing direction until then, is boosted to the secondary side by the boost pipe 27, and the force in the valve closing direction is attenuated. The valve opening amount increases, and the secondary side pressure rises quickly.

When the secondary side pressure rises to a predetermined pressure, the diaphragm 9 pulls up the valve body 10, and the primary side pressure flows into the pressure chamber 24 of the balance diaphragm 25, so that the balance diaphragm 25 and the valve body 10 have the same pressure. The valve closes when pressure is applied.

FIG. 5 shows the result of an experiment on the relationship between the flow rate and the secondary pressure. In the direct acting single valve governor shown in FIG. 6, the governor X using only the spring for the diaphragm is used.
Indicates that the secondary pressure decreases as the flow rate increases, and the governor Y that also uses weights decreases similarly even though the pressure decrease curve is gentle.

On the other hand, in the governor of the present invention, the secondary pressure becomes substantially uniform with respect to the flow rate as shown by the solid line in the figure.

Although not shown in the drawings, the valve body 10 is mounted on the spindle shaft 11 by a spherical structure so that the valve body 10 rolls so that the seat ring forming the port 5 and the valve body 10 are always kept in a constant joint. I'm supposed to get it.

[0030]

As described above, according to the present invention, a hollow chamber, which is separated from the primary pressure side, is provided in the middle of the spindle shaft connecting the diaphragm operating with the secondary pressure and the valve body, and the spindle shaft is provided in this hollow chamber. Since the balance diaphragm linked with the balance diaphragm is installed and the tip of the boost pipe communicating with the pressure chamber of this balance diaphragm is made to face the primary pressure side of the port part, the primary side pressure acting in the valve opening direction when the valve is closed The primary side pressure of the balance diaphragm acting in the valve closing direction of the valve body is balanced, and at the time of valve opening, the boost pipe primary pressure can be boosted to the secondary side to attenuate the force in the valve closing direction. Therefore, the valve opening operation of the valve body has a good response to the fluctuation of the secondary pressure, and the secondary pressure can be maintained within a constant range even if the flow rate increases.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a governor of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a state when the valve is closed in the above.

FIG. 3 is an enlarged sectional view showing a state when the valve is also opened.

FIG. 4 is a graph showing the relationship between the flow rate and the secondary pressure in the conventional governor.

FIG. 5 is a graph showing the relationship between the flow rate and the secondary pressure of the governor of the present invention and the conventional governor.

FIG. 6 is a vertical sectional view showing the basic structure of a direct-acting single-valve governor.

FIG. 7 is a longitudinal sectional view showing a conventional governor in which a balance diaphragm is incorporated in the governor of the above.

[Explanation of symbols]

 1 Valve Box 2 Primary Pressure Side 3 Secondary Pressure Side 5 Port 6 Diaphragm Device 9 Diaphragm 10 Valve Body 11 Spindle Shaft 13 Spring 21 Balance Diaphragm Device 23 Back Pressure Chamber 24 Pressure Chamber 25 Balance Diaphragm 27 Boost Pipe

Claims (2)

[Scope of utility model registration request] 1. A valve body 10 for opening and closing a port 5 provided between a primary pressure side 2 and a secondary pressure side 3 of a fluid passage on the secondary pressure side 3.
And a diaphragm device that communicates the pressure chamber 7 with the secondary pressure side 3.
In the governor interlocking the diaphragm 9 of the apparatus 6 via the spindle shaft 11 so that the valve body 10 controls the opening degree of the port 5 by the pressure fluctuation on the secondary pressure side 3 , at a midway position of the spindle shaft 11 , A hollow chamber is provided which penetrates the spindle shaft 11 in the axial direction and is separated from the primary pressure side 2. The hollow chamber is provided with the back chamber 23 and the pressure chamber 24.
To separate, and to incorporate a balance diaphragm 25 in conjunction with the spindle shaft 11, and is faced with the distal end opening to the primary pressure side second port 5 parts of a boost pipe 27 provided so as to connected to the pressure chamber 24 of the hollow chamber <br/> governor according to claim. 2. The governor according to claim 1, wherein the fluid action area of the balance diaphragm 25 and the area of the port 5 are formed in the same area.