JPS6119320Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat quantity control device for a gas combustor.

FIG. 1 shows the configuration of a conventional gas combustion device. In the figure, 1 is a burner, 2 is a main nozzle, 3 is an electric secondary pressure variable governor, and 4 is a solenoid valve.

As shown in FIG. 2, the electric variable secondary pressure governor 3 is composed of an electromagnetic coil 31, a magnet 32, a diaphragm 33, and a valve body 34. It has the function of keeping the outlet pressure constant by balancing the repulsive forces.

In the combustion apparatus having the above configuration, the amount of heat is controlled by changing the magnitude of the current flowing through the electromagnetic coil 31 of the governor 3 to change the secondary pressure.

However, since the amount of heat was controlled only by the electric variable secondary pressure governor 3, when the nozzle hole diameter of the main nozzle 2 is constant, the burner 1
The input Q is expressed as Q=π/4d ² c√, where d is the nozzle hole diameter, c is the flow coefficient, and p is the secondary pressure.The relationship shown in Figure 3 is obtained, so the pressure p is 1 /16
If not, the input Q will not be 1/4. That is, the third
As shown in the figure, if the secondary pressure is p ₀ and the input Q _{is 0} , to reduce the input to 1/4 of Q ₁ , the secondary pressure must be p ₁ = p
It needs to be _0/16 .

Therefore, in order to widen the calorific value control range, the secondary pressure must be lowered, but if the secondary pressure is lowered too much, the primary air will be less attracted, resulting in poor combustibility. It had the drawback of blowing out.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above, and it is equipped with a solenoid valve with a bypass circuit, and the input is controlled by the control operation of this solenoid valve and an electric secondary pressure variable governor. By doing so, the present invention aims to provide a heat amount control device that can expand the heat amount control range without significantly lowering the secondary pressure.

An embodiment of this invention will be described below with reference to the drawings.

In Fig. 4, 1 is a burner, 2 is a main nozzle, 3 is an electric secondary pressure variable governor, 4 is a solenoid valve, and 5 is inserted into a gas flow path on the side of the gas supply source from the main nozzle 2. Solenoid valve for input control, 6
A bypass circuit is a bypass circuit for this electromagnetic valve 5, and a bypass nozzle 7 is provided to throttle the input.
This bypass nozzle 7 is, for example, the main nozzle 2.
It shall be kept at 1/2 of that.

Next, the operation will be explained. When the input control solenoid valve 5 is in an open state, as shown in FIG. 5, if the secondary pressure of the governor 3 is the maximum rated pressure p ₀ , the input becomes Q ₀ . Lower the secondary pressure from this state
If p ₂ is p ₀ /4, the input is the maximum rated input Q ₀
It becomes Q ₂ of 1/2. To further reduce the input, close the input control solenoid valve 5 so that it passes through the bypass circuit 6, and at the same time, once the secondary pressure of the governor 3 is returned to the rated pressure p ₀ , the bypass circuit The input is rated value Q ₀ by nozzle 7 in 6.
1/2 of Q becomes ₂ .

After achieving this state, when the secondary pressure of the governor 3 is lowered again, the input is gradually reduced and the rated pressure p ₀
At a pressure p ₂ that is 1/4 of the constant value Q ₀ , the input becomes Q ₁ , which is 1/4 of the constant value Q 0. In this case, the secondary pressure of governor 3 is 1/1 of the rated pressure.
Since it has only decreased to 4, there is little adverse effect on combustibility.

As described above, according to this invention, a solenoid valve equipped with a bypass circuit is attached, and the input is controlled by a combination of this and an electric secondary pressure variable governor, so that the secondary pressure can be controlled. Input control can be performed over a wide range without significantly reducing the power.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional gas combustor, Figure 2 is a schematic diagram showing the structure of an electric variable secondary pressure governor, and Figure 3 is a curve showing the relationship between secondary pressure and input heat of the conventional type. 4 are block diagrams showing one embodiment of this invention, and FIG. 5 is a curve diagram showing the relationship between secondary pressure and input heat amount in the case of the same embodiment. 1...Burner, 2...Main nozzle, 3...Electric secondary pressure variable governor, 4...Solenoid valve, 5...
Input control solenoid valve, 6... Bypass circuit, 7...
Bypass nozzle. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of utility model registration request] In a combustion device that supplies fuel gas to a burner 1 for combustion through a solenoid valve 4, an electric variable secondary pressure governor 3, and a main nozzle 2, input from the main nozzle 2 to a gas flow path on the gas supply source side. A solenoid valve 5 for control is provided, and a bypass circuit 6 having a bypass nozzle 7 for input throttling is provided, which serves as a bypass for the solenoid valve 5 for input control. A heat amount control device characterized in that an input is controlled by a control operation of a control solenoid valve 5.