JPS6252210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas combustion output proportional control device using a gas governor and a solenoid valve.

Many devices have already been proposed that control the gas output by adjusting the back pressure of the governor mechanism, but the known device is equipped with an operating valve in the operating passage to the back pressure chamber of the diaphragm, and the control valve is controlled by the operation of the operating valve. Types that simply control the gas output on and off, or types in which a solenoid valve is directly connected to the main valve of the diaphragm, are common, and although they have a complicated and expensive structure, the amount of gas supplied is small. It has been difficult to quickly and accurately control the gas output in response to the

The present invention addresses these conventional drawbacks, and its purpose is to provide a device that can quickly, safely and accurately control the combustion output of a gas burner over a wide range from minimum to maximum in response to supply gas pressure. It is in the point of providing.

Such an objective is to provide a gas governor equipped with a diaphragm that is displaced depending on the force relationship between gas pressure and back pressure, and a main valve that is connected to the diaphragm and controls the opening and closing of the valve port to the gas outlet. A solenoid valve is installed in the passage leading to the back pressure chamber of the diaphragm to externally control the back pressure using part of the supply gas pressure, and an orifice for flow restriction is installed in both the passage to the back pressure chamber and its outflow passage. This can be achieved by linearly controlling the gas output at the gas outlet by changing the diaphragm back pressure by changing the on/off time or cycle of the solenoid valve, or both, by providing each solenoid valve separately.

Examples will be described below.

The diaphragm 1 itself is made of an elastic body having a restoring force, and is provided with a spring 10 or 10' on its back surface or pressure receiving surface, but this spring may not be provided in some cases. When gas is pressurized through the gas inlet 11, it flows from the pressure receiving chamber 12 of the diaphragm 1 through the valve port 3 to the gas outlet 2, from which it is supplied to a combustor such as a gas burner. When the solenoid valve 7 is energized, the valve plate 7a is pulled up to open the through hole 13, and when it is turned off, it is closed by the force of the valve spring 14.The on/off operation reduces the pressure acting on the back pressure chamber 5. It is something to control. Incidentally, an orifice 15 with a narrowed hole diameter is provided in the flow path leading from the through hole 13 to the back pressure chamber 5 so that the flow rate can be adjusted with the orifice 9 of the outflow path 8. FIG. 1 shows a case in which wind pressure from a blower (not shown) is applied to the back pressure chamber 5 from the inflow passage 6, and FIG. This is an embodiment in which a portion is taken out in a bypass manner. Although the electromagnetic valve 7 is provided in the control pressure inflow passage 6, it does not make any difference if it is provided in the outflow passage 8 side. Alternatively, the gas inlet 11 and the gas outlet 2 may be reversed so that the gas is introduced from the gas outlet 2, passes through the valve port 3 from below in the opposite direction, passes through the pressure receiving chamber 12, and then flows out from the inlet 11. can.

In the above-mentioned configuration, when gas is supplied from the gas inlet 11, the gas flows out from the pressure receiving chamber 12 through the valve port 3 to the gas outlet 2, but as the amount of inflow becomes large, the gas pressure increases and the diaphragm 1 is Since the gas is expanded upward, the main valve 4 responds to this by acting in the direction of closing the valve port 3, thereby restricting the flow rate of the gas. As a result, the pressure in the pressure receiving chamber 12 decreases, so the valve port 3 becomes larger again, and by repeating this, the gas amount is limited to a certain range, but this alone slows down the response operation and prevents smoothing. Control pressure cannot be obtained. Next, in this state, when back pressure is applied from the inflow passage 6 on the back pressure chamber side, when the back pressure increases, the diaphragm 1 expands downward, so the opening degree of the valve port 3 increases, and the gas flow rate also increases. As the pressure increases, the pressure in the pressure receiving chamber 12 also increases, and the opening degree of the valve port 3 conversely decreases. Furthermore, if the solenoid valve 7 is activated to change the opening/closing time or cycle of the through hole 13 or both as appropriate, the back pressure Pc acting on the back pressure chamber 5 becomes an integrated and smoothed control pressure. . This control pressure linearly controls the gas pressure supplied from the gas outlet 2 to the burner and the like.

As described above, the present invention provides the passage 6 of the diaphragm 1 leading to the back pressure chamber 5 with a solenoid valve that externally controls the back pressure with a part of the supply gas pressure flowing in from the gas inlet. Orifices 15 and 9 for flow restriction are separately provided in both the inflow passage 6 to the chamber 5 and the outflow passage 8 thereof, and the solenoid valve 7 is turned on and off.
The gas output at the gas outlet is linearly controlled by changes in diaphragm back pressure due to changes in off time and/or period, allowing accurate control of gas output in response to changes in supply gas pressure. The control range is wide and accurate from the minimum to the maximum, and the response time is fast, so it has the effect of completely eliminating incomplete combustion and increasing combustion efficiency. In addition, since this type of control means uses electromagnetic force only for simple on/off operations, there is no need to worry about phenomena such as temperature runaway, and the pulse drive method makes it easy to integrate with a microcomputer, making it easy to control solenoid valves. Remote control by turning on and off is also easily possible. In addition, as the control pressure to the back pressure chamber is extracted by bypassing the supply gas pressure and using a part of it, not only is there no need for a special pressure source, but also the properties of gaseous fuel, namely compressibility and elasticity, are utilized. Furthermore, by selecting the hole diameter of the orifices provided in both passages, the on/off cycle is made faster, and the output pressure is integrated by the volume of the back pressure chamber, and the output pressure is supplied with a smooth pressure, and pulsation is eliminated. It is characterized by extremely stable combustion.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the device of the present invention, and FIG. 2 is an enlarged sectional view of an embodiment thereof. 1...Diaphragm, 2...Gas outlet, 3...Valve port,
4... Main valve, 5... Back pressure chamber, 6... Inflow passage, 7... Solenoid valve, 8... Outflow passage, 11... Gas inlet, 12... Pressure receiving chamber, 9, 15... Orifice.

Claims (1)

[Claims] 1. A gas governor equipped with a diaphragm 1 that is displaced by the force relationship between gas pressure and back pressure, and a main valve 4 that is connected to the diaphragm 1 and controls opening and closing of a valve port 3 to the gas outlet 2. A solenoid valve 7 for externally controlling the back pressure with a part of the supply gas pressure is provided in the passage 6 leading to the back pressure chamber 5 of No. 1, and a flow rate is provided in both the passage 6 to the back pressure chamber 5 and its outflow passage 8. Limiting orifices 15 and 9 are provided separately to linearly control the gas output at the gas outlet 2 by changing the diaphragm back pressure due to changes in the on/off time or cycle of the solenoid valve, or both. Characteristic gas combustion output proportional control device.