JPH02161209A - Fuel-burning equipment - Google Patents

Abstract

PURPOSE:To prevent the deterioration of combustion efficiency by installing a means to correct an adjustable opening of a fuel supply control valve in conformity with a controlled state of a fan. CONSTITUTION:An opening 1 of a solenoid proportional valve 8 is automatically controlled so that it may respond with 1a equivalent to a specified fuel supply quantity Ga just as a fuel supply quantity G conforms to a specified fuel supply quantity Ga. Then, an attempt is made to obtain a opening correction value DELTAIa equivalent to a measured fan capacity deviation DELTA Va based on a correlation fI=Ia between an opening correction value DELTA I and a fan capacity deviation DELTAVa where the adjustable opening Ia of the solenoid proportional valve 8 is defined as a parameter. Then, a final attempt is made to correct the adjustable opening Ia of the solenoid valve 8 under the control of A by the opening correction value DELTA Ia so that the actual adjustable opening of the solenoid valve 8 make the specified as Ia+DELTA Ia. In other words, this construction makes it possible to exert a required combustion performance with accuracy by allowing the actual fuel supply quantity G to conform to the specified fuel supply quantity properly under fuel supply quantity correction control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides means for detecting the amount of combustion air supplied to a burner section by a fan, and detects the amount of combustion air supplied to a burner section by a fan, and operates the fan so as to maintain the detected amount of air at a predetermined value. The present invention relates to a combustion apparatus that is provided with a fan control means that automatically adjusts the capacity, and a valve control means that automatically adjusts the opening degree of a fuel supply amount regulating valve in accordance with a specified fuel supply amount.

[Conventional technology]

Conventionally, in the above-mentioned combustion apparatus, only the opening degree of the fuel supply regulating valve was controlled to be uniquely adjusted to a value corresponding to the specified fuel supply amount.

[Problem to be solved by the invention] However, when the detected air volume decreases due to, for example, a blockage occurring in the exhaust path, the fan capacity is automatically adjusted to increase so as to return and maintain the detected air volume to a predetermined value. However, because the pressure in the combustion chamber changes due to the automatic adjustment to increase the fan power, the actual amount of fuel supplied to the combustion chamber changes even though the opening degree of the fuel supply amount adjustment valve does not change This causes an inconvenience in combustion operation control, such as a discrepancy between the designated fuel supply amount and the actual fuel supply amount.

In addition, as a form of fan capacity adjustment control to maintain the detected air volume at a predetermined value, when adopting a form in which the fan capacity is automatically adjusted so as to adjust and maintain the detected scenery at an optimal value according to the specified fuel supply amount, the above-mentioned When the exhaust path is clogged, etc., the air volume is adjusted and maintained at the optimal value according to the specified fuel supply amount by controlling the fan capacity, but as mentioned above, there is a difference between the specified fuel supply ■ and the actual fuel supply amount. Due to this deviation, the air-fuel ratio deviates from the optimum value, which leads to a decrease in combustibility itself.

An object of the present invention is to address the above-mentioned problems by adopting a rational control form.

[Means to solve the problem]

The characteristic configuration of the combustion apparatus according to the present invention is that means is provided for detecting the volume of combustion air supplied to the burner section by a fan, and fan control automatically adjusts the capacity of the fan so as to maintain the detected volume of air at a predetermined value. In a configuration in which a valve control means is provided for automatically adjusting the opening degree of the fuel supply amount adjusting valve according to a designated fuel supply amount, the adjusting opening degree of the fuel supply amount adjusting valve by the valve control means is: The present invention is provided with means for correcting according to the capacity adjustment state of the fan, and its functions and effects are as follows.

[Function] In other words, the combustion chamber pressure change that causes the deviation in the actual fuel supply amount is caused by the automatic adjustment of the fan capacity due to exhaust passage obstruction, etc. Therefore, the specified fuel supply is controlled by the valve control means. If the adjustment opening of the fuel supply amount adjustment valve, which is adjusted to a value according to the fuel amount, is corrected according to the fan capacity adjustment state, it will be possible to prevent combustion chamber pressure changes caused by automatic fan capacity adjustment due to exhaust path blockage, etc. It is possible to match the actual fuel supply amount to the designated fuel supply amount regardless of the situation.

(Effect of the invention) As a result, it is possible to accurately demonstrate the combustion capacity as specified and as rated for maximum capacity and minimum capacity, and the reliability of combustion operation control can be improved. As a form of fan capacity adjustment control that maintains the detected air volume at a predetermined value, a form that automatically adjusts the fan capacity to maintain the detected air volume at the optimal value according to the specified fuel supply amount is adopted. -WJ can now be maintained at the optimum value more strictly, and flammability itself can be further improved.

〔Example〕

The present invention will be explained in detail below.

Figure 1 shows a gas water heater as an example of a combustion device, including a burner (I) and a fin-tube heat exchanger (2) that heats flowing water with the combustion gas from the burner (I).
is housed inside the casing (3), and one end of the casing (3) is provided with air forcibly supplying combustion air to the burner section via the baffle plate (4), and at the same time supplying combustion air that has passed through the heat exchanger (2). A fan (6) for forced exhaust air is connected through the exhaust air passage (5) at the other end of the casing.

(7) is a fuel supply path to the burner (I), which is equipped with an electromagnetic proportional valve (8) for adjusting the fuel supply amount.

Burner (I) and heat exchanger (2) in casing (3)
) and the air chamber portion (I0) on the upstream side of the baffle plate (4) are communicated with each other by an external communication pipe (I1). ) includes a wind speed sensor (I2) for detecting the supply wind fj-(n) of combustion air by the fan (6) based on the detection of the passing wind speed.
It is equipped with.

(I3) is a controller that controls operation, and basically the controller (I3) is as shown in (a) below.

(TI) control.

(a) Set the opening degree (I) of the electromagnetic proportional valve (8) to the value (Ia) according to the specified fuel supply amount (Ga) so that the fuel supply amount (G) is the specified fuel supply meter (Ga). Automatically adjust.

Ru.

Here, the designated fuel supply 1i (Ga) is the fuel supply amount required to maintain the hot water temperature detected by the hot water supply temperature sensor (I4) at the set hot water temperature, and is calculated and designated within the controller (I3). It is something.

(υ) Automatically adjust the capacity of the fan (6) so as to maintain the detected wind ffi (Q) at a predetermined value.Specifically, the fuel supply amount (G) and Based on the setting correlation with the optimum air volume (2), the detected air volume (B) is set to the optimum air flow f corresponding to the specified fuel supply Fjt (Ga) at that time.
The capacity of the fan (6) is automatically adjusted to maintain f1 (Qa).

That is, by the operation control of C-i) and (0) mentioned above,
If the exhaust path is clogged, even if some disturbance occurs that causes a change in air volume, such as the application of back wind pressure to the exhaust air path due to outside wind,
Even if the exhaust pressure drop differs from the design value due to the length of the connected exhaust duct differing depending on the installation situation, the fuel supply will continue while maintaining the air volume at the optimal value according to the specified fuel supply amount. The amount of fuel supplied is adjusted to a specified fuel supply amount to continuously generate hot water at a set temperature.

Furthermore, in addition to the basic operation control described in (a) and (b) above, the controller (I3) performs the following (+
+) and (d).

(c) Mf as shown in FIG. 3 (a) which is stored in advance
The design correlation (m) between fi (b) and fan capacity (V) (specifically fan applied voltage) Air volume under design conditions (with duct length as designed)
Based on the correlation between (b) and fan capacity (ν) (fan applied voltage), the optimal wind according to the specified fuel supply amount (Ga) is designed! The design fan capacity value (Va) required to obtain (Qa) and the optimal wind I(
Fan ability value (Va') actually required to obtain Qa)
Measure the deviation (ΔVa) from

(d) And by the control mentioned in (b) above! Magnetic ratio side valve (8
) with the adjusted opening degree (Ia) as a parameter (+1
), the opening correction value (Δ■) and fan capacity deviation (
Based on the correlation f(I・IQ) with ΔV), the opening correction value (ΔIa) corresponding to the measured fan capacity deviation (ΔVa)
Finally, the electromagnetic proportional valve (8) is determined by the control in (a).
By correcting the adjusted opening (Ia) by the opening correction value (ΔIa), the actual adjusted opening of the electromagnetic proportional valve (8) becomes (Ia+
Let ΔIa) be straight.

The correlation (f) between the opening correction value (ΔI) and the fan capacity deviation (ΔV) shown in FIG. 3 (b) is based on the electromagnetic proportional valve (8
Even if the opening degree of ) is a constant value (la), the actual fuel supply amount (G) is due to the combustion chamber pressure change due to fan capacity adjustment, and the specified fuel supply is in accordance with the fan capacity deviation (Δνa). Every time the quantity (Ga) deviates, the deviation is corrected and the actual fuel supply m (to) is changed to the specified fuel supply quantity (G).
It provides the opening degree correction value (ΔIa) required to match a), and the correlation is obtained based on the device test results etc. and stored in the controller (I3).

In other words, by appropriately matching the actual fuel supply f (G) with the specified fuel supply amount (Ga) using the fuel supply amount correction control described in (c) + (=) above, the required combustion capacity can be accurately achieved. At the same time, in conjunction with the fan capacity adjustment control described in (b) above, the air-fuel ratio is kept close to the optimum value by one degree.

[Another example]

Next, another example will be listed.

(i) In the above embodiment, the fan applied voltage is taken as a specific example of what represents the fan capacity, and the adjusted opening of the electromagnetic proportional valve for fuel supply amount adjustment is corrected according to the adjusted state of the fan applied voltage. But instead,
The fan rotation speed, firing angle in phase control, etc. are taken as indicators of fan capacity, and the adjusted opening degree of the fuel supply amount adjustment valve is corrected according to the adjustment state of the fan rotation speed and firing angle. Also good.

(I1) As a form of fan capacity adjustment control that maintains the detected air volume at a predetermined value, the present invention automatically adjusts the fan capacity to adjust and maintain the detected air volume at an optimal value according to the specified fuel supply amount, as in the above embodiment. It can be applied to either a type in which the fan capacity is adjusted or a type in which the fan capacity is automatically adjusted so that the detected air volume is maintained at a constant value regardless of changes and adjustments in the fuel supply amount.

(ii) Furthermore, the present invention is applicable not only to water heaters but also to various combustion devices.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 to 3 show examples of the present invention, in which FIG. 1 is a diagram of the device configuration, FIG. 2 is a graph of air volume and fuel supply amount, and FIG. 3 (() and (TI) are fuel It is a graph for explaining the control form of supply amount correction control. (6)...Fan, (8)...Fuel supply amount adjustment valve, (Q)...・Detected air volume, (])...
...Opening degree, (Ia)...Adjusted opening degree, (Ga
)...Specified fuel supply amount.

Claims (1)

[Claims] Fan control means includes means for detecting the amount of combustion air supplied to the burner section by the fan (6), and automatically adjusts the capacity of the fan (6) so as to maintain the detected air amount (Q) at a predetermined value. and a valve control means for automatically adjusting the opening degree (I) of a fuel supply amount regulating valve (8) according to a designated fuel supply amount (Ga), Adjustment opening degree (Ia) of supply amount adjustment valve (8)
The combustion apparatus is provided with means for correcting according to the capacity adjustment state of the fan (6).