JPS5818563B2 - Combustion control device - Google Patents

Description

Detailed Description of the Invention The main purpose of the present invention is to automatically adjust the amount of fuel supplied according to the amount of combustion air to maintain a constant excess air ratio at all times. The aim is to simultaneously change the fuel pressure in the event of a change in fuel pressure so that the amount of combustion does not change.

An embodiment using gas as the fuel will be described below with reference to the accompanying drawings.

In the figure, air enters from air population 1 and air orifice 2.
and enters the combustion section through the air outlet 3 (through the air path).

4 is a first diaphragm that divides the air chamber into a high air pressure chamber 5 on the upstream side and a low air pressure chamber 6 on the downstream side, and the movement of the first diaphragm 4 is controlled by the governor spring 7.
This means pressing one end of the .

Next, the gas enters through the gas port 8, passes through the gas orifice 9 formed by the body 14 and the actuator 12, and passes through the gas outlet 1
0 (passes through the fuel path) and reaches the combustion part such as the nozzle.

A second diaphragm 11 has one side facing the fuel passage and the other side facing the air passage, and an actuator spring 13 is provided to interlock with the second diaphragm 11.

Reference numeral 15 denotes a secondary gas chamber, and the gas flow rate is determined by this pressure and the diameter of a nozzle (not shown).

Next, to explain the operation, if the support point of the governor spring 7 is constant and the pressure on the downstream surface of the second diaphragm 11 (low air pressure chamber 6 in the figure) is constant, the gas governor will operate in the same way as a normal gas governor. Therefore, I will not specifically explain it.

Next, when the amount of air increases, the pressure pushes the second diaphragm 11 downward, and a further pressure difference is created by the air orifice 2, causing the first diaphragm 4 to displace a little downward in the figure, and the governor spring 7 compressed and second
Since the diaphragm 11 is pushed downward, the gas secondary pressure chamber 1
5 pressure becomes higher.

In this way, there is a function to adjust the gas secondary pressure chamber 15 by an amount according to the amount of air, so when the amount of air increases, the amount of gas also increases, and conversely, when the amount of air decreases, the amount of gas also decreases.
As a result, the air-gas ratio (excess air ratio) is always kept constant, making it possible to improve and maintain thermal efficiency and combustion performance.

Next, the other surface of the second diaphragm 11 is in contact with the low air pressure chamber 6, and this low air pressure chamber 6 is connected to the internal pressure of the combustion chamber.

Therefore, when the internal pressure of the combustion chamber changes due to external wind pressure, etc., the gas amount is related to the pressure difference between the front (gas secondary chamber) and the rear (combustion chamber) of the nozzle, so the gas secondary pressure chamber 15 is kept at a constant pressure. If so, a change in gas amount also occurs.

Therefore, even if the air volume is constant, if there is a change in the outside air pressure, the gas volume will change and the excess air ratio will fluctuate.

Regarding this point, in the above configuration, the second diaphragm 11 is in contact with the low air pressure chamber 6, so if the pressure in the combustion chamber increases due to outside air pressure, even if the pressing force of the governor spring 7 does not change, the pressure in the low air pressure chamber Since the internal pressure of the nozzle 6 is increasing, the force applied to the second diaphragm 11 increases, which has the effect of increasing the pressure in the gas secondary pressure chamber 15, and has the function of making the pressure difference before and after the nozzle constant.

In this way, in addition to responding to the air amount, the gas amount is controlled in response to the combustion chamber as well, making it possible to maintain a constant excess air ratio regardless of fluctuations in external conditions such as supply and exhaust fan motor voltage, frequency, and outside air. becomes.

Although gas was used as the fuel in the above embodiments, the same effects and effects can be obtained even when petroleum is used.As can be seen from the three or more embodiments, the present invention has a fuel path on one side and an air path on the other side. Since the displacement of the first diaphragm is transmitted via the spring to the second diaphragm facing the air passage, for example, when the amount of air flowing through the air passage increases, not only does the pressure in the air passage increase, but also the displacement of the first diaphragm increases due to the increase in the amount of air. The displacement of one diaphragm is transmitted to the first diaphragm via the spring, increasing the amount of fuel flowing through the fuel path.Conversely, if the amount of air decreases, the amount of fuel also decreases, and the air-fuel ratio is always constant and combustion occurs. The condition is extremely good.

In this case, the second diaphragm is not driven only by the pressure in the air passage, but the change in the first diaphragm is transmitted by the spring, so even a small change in the amount of air can cause the second diaphragm to be driven by the pressure in the air passage.
The diaphragm can be driven sufficiently, allowing for more detailed and accurate air-fuel ratio control.

Furthermore, since the air-fuel ratio is controlled by driving the second diaphragm that drives the fuel governor according to the amount of air, there is no need to provide another valve body in the fuel path, and the resistance in the fuel path does not increase accordingly. This makes it easier to send fuel.

[Brief explanation of the drawing]

The drawing is a sectional view of a combustion control device showing an embodiment of the present invention. 2... Air orifice, 4... First diaphragm, 7... Governor spring (spring), 11... Second diaphragm.

Claims (1)

[Claims] 1 An air passage, a fuel passage through which fuel flows to be mixed with the air flowing through this air passage, and an air passage provided in the upper vessel air passage,
a first diaphragm having an air orifice through which air flows; a fuel governor provided in the fuel passage; a second diaphragm having one side facing the fuel passage and the other side facing the air passage; A combustion control device comprising a spring interposed between the other surface of the diaphragm and the downstream side of the air passage of the first diaphragm.