JPS60215219A - Governor - Google Patents

Abstract

PURPOSE:To boost a primary pressure of a balance diaphragm to the secondary side with a boost pipe and to attenuate the force in the valve closing direction to boost the secondary-side pressure when a valve is opened, by providing a diaphragm, which is operated with the secondary-side pressure, and the balance diaphragm on the way of a spindle shaft connected to a valve body. CONSTITUTION:A diaphragm 9 operated by the secondary pressure and a valve body 10 are interlocked by a spindle shaft 11, and a balance diaphragm 25 is provided on the way of this spindle shaft 11. The front end of a boost pipe 27 connected to a pressure chamber of this balance diaphragm 25 is allowed to face a port 5 from the primary pressure side, and the primary pressure acting upon the valve body 10 is balanced by the balance diaphragm 25. When the valve is opened, the pressure acting upon the balance diaphragm 25 is boosted to the secondary pressure side by the boost pipe 27, and the force in the valve closing direction is attenuated to raise the secondary-side pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a governor that does not cause pressure fluctuations due to changes in flow rate on the secondary side.

The basic structure of a direct-acting single-cell governor that is installed in a gas supply path and automatically controls the flow rate by changing the pressure on the secondary side will be explained with reference to FIG.

In FIG. 1, a boat 5 is provided on a partition wall 4 that partitions 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 disposed in the upper part of the valve box 1 is connected to an adjustment pipe 8. The diaphragm 9 and the valve body 10 located on the secondary pressure side of the boat 5 are linked by a spindle shaft 11, and a spring 13 is installed in the back pressure chamber 12 of the diaphragm 9 as necessary. A weight 14 is incorporated.

Since the pressure on the secondary pressure side 3 is introduced into the pressure chamber 7 of the diaphragm 9, assuming that the gas pressure acting on the diaphragm 9 and the force of the spring 13 are balanced, the valve body 10 will open at a certain degree. , and a certain amount of gas flows from the boat 5 to the secondary pressure side 3.

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

Conversely, when the demand for gas decreases, the pressure on the secondary pressure side 3 increases, so the upward force acting on the diaphragm 9 increases, overcoming the force of the spring 13, and the valve body 10 moves in the closing direction to a predetermined position. The gas amount decreases to a pressure of .

By the way, in the above-mentioned direct-acting single-cell governor, as shown by the dashed-dotted line in the graph of Figure 4, there is an ideal secondary pressure line where the secondary pressure is always constant even if the flow rate changes. It must be possible to obtain the formula.

However, in the direct acting type governor, due to the influence of the shape of the spring 13, the diaphragm 9, the valve box 1, and the secondary pressure, the secondary pressure tends to be much lower than the ideal secondary pressure line type when the first flow rate increases.

That is, as shown in FIG. 4, the secondary pressure is -b when it is influenced by the spring 13, and C1 when it is further influenced by the diaphragm 9. will decrease.

As mentioned above, the main reason why the secondary pressure decreases with respect to the flow rate is that the secondary pressure acts directly on the diaphragm 9, and at the same time, the primary pressure always acts on the valve body 10 in the direction of opening the valve. This is because the characteristics become extremely unstable.

This invention was made in view of the above points, and it is an object of this invention to eliminate all the problems of the direct-acting single-valve structure by eliminating the drop in secondary pressure even when the secondary flow rate increases. The purpose is to provide a governor who can.

The structure of this invention is that a diaphragm and a valve body operated by primary and secondary pressure are linked by a spindle shaft, a balance diaphragm is provided in the middle of this spindle shaft, and the tip of the vibrator (booth) is connected to the pressure chamber of the balance diaphragm. The boat is faced from the pressure side, and the balance diaphragm balances the primary pressure that acts on the body, and the pressure that acts on the balance diaphragm when the valve opens is boosted to the secondary pressure side using the boost pipe, and the sword in the valve closing direction is The secondary pressure is increased by attenuating the pressure.

Hereinafter, the present invention will be explained based on embodiments shown in the accompanying drawings.

In the direct acting single valve cover shown in FIG. 1, a balance diaphragm device 21 is provided midway along the spindle shaft 11, and the diaphragm device 21 balances the primary pressure acting on the valve body 10 in the valve opening direction.

As shown in FIGS. 2 and 3, the balance diaphragm device 21 has a large diameter portion 22 on the spindle shaft 11 passing through the hollow chamber, and the inside of the hollow pot is connected to an upper back pressure chamber 23 and a lower pressure chamber 24. A part of the balance diaphragm 25 that divides the large diameter part 22 is overlapped from the bottom surface to the side surface of the large diameter part 22, thereby reducing the number of convolution parts 26.

The fluid action area in the pressure chamber 24 of the balance diaphragm 25 and the area of the boat 5 are formed to be the same, and the convolution portion 26 is small, so that the balance diaphragm 25 when the valve is closed as shown in FIG. 2 and when the valve is opened as shown in FIG. 25 so that no change occurs in the fluid action area.

The lower end opening of the boost pipe 27 communicating with the pressure system mouth of the balance diaphragm device 21 faces into the boat 5 on the primary pressure side, and as shown in FIG. 2, the valve body 10 is in the closed position.
A small gap is maintained at the top of the

Primary pressure flows into the lower pressure chamber 24 through the boost pipe 27, and the diaphragm 9 flows into the upper back pressure chamber 23.
Secondary pressure flows in from the pressure chamber 7, and the primary pressure acting on the valve body 10 and the balance diaphragm 25 are balanced when the valve is closed.

When the pressure on the secondary pressure side 3 decreases in the above valve closed state, the pressure in the pressure chamber 7 of the diaphragm 9 also decreases, and the pressure of the spring 13 moves the valve body 10 together with the spindle shaft 11 in the valve opening direction. As shown in Figure 3, the boat 5 opens and the downstream fluid flows out through the boat 5 to the secondary side.

When the valve body 10 opens and the flow velocity of the boat 5 increases, a suction action is generated at the tip of the boost pipe 27, and the pressure fluid in the pressure filter 24 of the balance diaphragm 25 is suctioned.

Therefore, the fluid in the pressure chamber 24 of the balance diaphragm 25, which had been acting in the valve closing direction, is transferred to the boost pipe 27.
Since the pressure is boosted to the secondary side and the force in the valve closing direction is attenuated, the opening amount of the valve body 10 increases, and the secondary side pressure increases quickly.

Further, when the secondary side pressure rises to a predetermined pressure, the valve body 10 is pulled up by the diaphragm 9, the primary side pressure flows into the pressure chamber 24 of the balance diaphragm 25, and the same pressure acts on the balance diaphragm 2 and the valve body 10. The valve is closed when the valve is closed.

Figure 5 shows the results of an experiment on the relationship between flow rate and secondary pressure, using a direct-acting single tank in a banner.

Governor X, which uses only a spring for the diaphragm, has a decrease in secondary pressure as the flow rate increases, and Banner Y, which also uses a weight, has a similar decrease in pressure, although the pressure decrease curve is gentler.

On the other hand, the banner of this invention, as shown in the same figure,
The secondary pressure becomes approximately - with respect to the flow rate.

Although not shown in the drawings, the valve body 10 is attached to the spindle shaft 11 so that the valve body 10 can roll due to its spherical structure so that the connection between the seat ring forming the port 5 and the valve body 10 is always kept constant. It has become.

As described above, the present invention provides a balance diaphragm in the middle of the spindle shaft that communicates the diaphragm operated by the secondary pressure and the valve body, and connects the tip of the boost pipe communicating with the pressure chamber of the balance diaphragm to the primary pressure of the port. Because it faces toward the side, when the valve is closed, the primary pressure of the valve body and the balance diaphragm are balanced, and when the valve is opened, the boost pipe boosts the primary pressure of the balance diaphragm to the secondary side, attenuating the force in the valve closing direction. Therefore, the valve opening operation of the valve body becomes more responsive to fluctuations in the secondary pressure, and even if the flow rate increases, the secondary pressure can be maintained within a constant range.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing the banner of this invention, Figure 2
3 is an enlarged sectional view of the main part showing the same state when the valve is open, and FIG. 4 is an enlarged sectional view showing the same state when the valve is open. The graph shown in FIG. 5 is a graph showing the relationship between flow rate and secondary pressure of the governor of the present invention and the conventional governor. 1...Valve box-2 is the primary pressure side, 3 is the secondary pressure side, 5 is the port, 6 is the diaphragm device, 9... diaphragm, 10 is the valve body, 11 is the spindle, 13ζ spring, 21
23 is a balance diaphragm device, 23 is a back pressure chamber, 24 is a pressure chamber, 25 is a lance diaphragm, and 27 is a boost pipe Patent applicant Kyoseido Co., Ltd. Agent Kama 1) Bun 2

Claims (2)

[Claims] (1) The valve element that opens and closes the boat provided between the primary pressure side and the secondary pressure side of the fluid passage, and the diaphragm that communicates the pressure chamber with the secondary pressure side, are activated by pressure fluctuations on the secondary pressure side. is interlocked via the spindle shaft so as to control the opening degree of the boat, and a balance diaphragm interlocked with the spindle shaft is incorporated in a hollow chamber provided in the middle of the spindle shaft,
A governor with the tip of the boost pipe connected to the pressure side of the hollow chamber facing the hoard part on the primary pressure side. (2) The governor according to claim 1, wherein the balance diaphragm and the square boat are formed in the same area.