JPH0624668Y2 - Air-fuel ratio controller for combustion of heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a combustion air-fuel ratio control device for a heater, which controls an air-fuel ratio which is a ratio of an air amount to an oil amount.

(Prior Art) Conventionally, a heater is provided with a combustion blower that feeds combustion air to a burner and a fuel supply pump that supplies oil. The air amount is controlled by a damper to maintain a constant air-fuel ratio. I have to.

However, in such a heater, since the air density is different between the place where the heater is installed, that is, the case where it is installed in the lowlands and the case where it is installed in the highlands, the air amount changes. When dust adheres to the dust removal filter or the like, the ventilation resistance increases, and the amount of air tends to decrease.

When such a situation occurs, the opening degree of the damper is finely adjusted to correct the air amount to keep the air-fuel ratio constant.

(Problems to be solved by the invention) However, when the correction of the air-fuel ratio control is performed by the damper in this way, even if the opening degree of the damper is slightly changed, the air amount greatly changes, so that the damper opening is performed. The fine adjustment of the degree was very troublesome.

Further, although the air amount is appropriate at the time of small combustion, it may be defective at the time of large combustion, or may be in the opposite state. In such a case, even if adjustment is made to eliminate the defective state of the damper opening, the large or small combustion that was proper until then often becomes defective, and the adjustment of the air-fuel ratio becomes impossible. Occurred.

In view of the above conventional problems, an object of the present invention is to provide an air-fuel ratio control device for combustion of a heater, which can surely obtain a desired air-fuel ratio without using a damper.

(Means for Solving the Problems) In order to solve the above problems, the present invention uses a linear function to proportionally control the amount of air by a combustion blower and the amount of oil by a fuel supply pump. A controller, a small rotation speed adjusting volume for adjusting the rotation speed of the combustion blower in a small rotation speed range based on a plurality of rotation speed positions having different rotation speeds, and a rotation speed of the combustion blower in a large rotation speed range. A rotational speed adjusting volume for adjusting the rotational speed of the combustion blower based on a plurality of rotational speed positions having different rotational speeds, and the rotational speed positions set by the rotational speed volumes are changed equally in the increasing or decreasing direction of the rotational speed of the combustion blower. An air amount adjusting volume to be made to operate, an operation means to operate the linear function based on each rotation speed position set by each of the adjusting volumes, and the operation. Drive means for driving the blower for combustion and the fuel supply pump based on the linear function obtained by the means.

(Operation) According to the present invention, the small rotation speed adjustment volume sets the rotation speed position in the small rotation speed range, the large rotation speed adjustment volume sets the rotation speed position in the large rotation speed range, and the air volume adjustment volume controls each rotation speed. The setting of several positions is changed.

A linear function of the air-fuel ratio is calculated based on each of the set rotational speed positions, and the combustion blower and the fuel supply pump are driven based on this linear function.

As a result, the optimum air-fuel ratio can be obtained even when the ventilation resistance or the like changes.

In addition, as described above, by changing each rotation speed position that has already been set by each rotation speed volume with the air amount adjustment volume, the air amount is constantly increased or decreased from the small rotation speed range of the combustion blower to the large rotation speed range. Therefore, it is possible to easily change the already set air amount.

(Embodiment) FIGS. 1 to 5 show an embodiment of the present invention, and FIG. 1 shows a semi-hermetic pot type oil stove. 1 in the figure
Is a semi-enclosed pot-type oil stove, inside of which a pot burner (not shown) is incorporated. Further, the stove 1 includes a combustion blower 2 and an electromagnetic pump 3 which are driven by an AC power source shown in FIG. 4, and the combustion blower 2 supplies combustion air and the electromagnetic pump 3 generates combustion oil. Feed to the pot burner. Further, an operation panel 5 is provided on the front panel 4 of the stove 1.

FIG. 2 is an enlarged front view of the operation panel 5. The operation panel 5 has a small rotation speed adjustment volume 6, a large rotation speed adjustment volume 7, and an air amount adjustment volume 8 arranged laterally on one side thereof. On the other side of the operation panel 5, a first display unit 9 that displays the level number of the small rotation speed adjustment volume 6, a second display unit 10 that displays the level number of the large rotation speed adjustment volume 7, and an air volume adjustment volume. 8
The third display section 11 for displaying the number of levels is provided respectively, and the respective display sections 9 to 11 are sequentially arranged from the end of the operation panel 5. Each of the display units 9 to 11 is composed of a 7-segment LED, and the display units 9 to 11 can display the number of levels "1" to "8". Further, each of the adjusting volumes 6 to 8 is a push-button type volume and changes by one position each time it is pressed, and "1" ... "8""1" ...
Repeatedly display "8". Incidentally, 12 is an oil amount adjusting knob which can be adjusted from small combustion to large combustion.

FIG. 3 is a graph showing the characteristics of the combustion blower 2 and the electromagnetic pump 3 which are adjusted by the adjusting volumes 6 to 8. As shown in FIG. 3, the small rotation speed adjusting volume 6 controls the small rotation speed range of the combustion blower 2 from 1070 rpm to 1560 r.
The rotational speed positions α to θ can be adjusted in eight steps up to pm. The large rotation speed adjusting volume 7 is a blower 2 for combustion.
The rotational speed positions a to h can be adjusted in eight steps in the large rotational speed range from 1950 rpm to 2650 rpm. The air amount adjusting volume 8 is set at the small rotational speed adjusting volume 6 and the large rotational speed adjusting volume 7 at each rotational speed position α to θ, a to h.
Can be changed by the same position in the increasing or decreasing direction of the rotation speed, and can be adjusted in eight steps based on the rotation speed positions α to θ of the small rotation speed adjusting volume 6. The rotation speed positions α to θ of the small rotation speed adjusting volume 6 are paired with the displays “1” to “8” on the first display unit 9, that is, “α” and “1” ... “θ” and “8”. , And the positions α to θ are sequentially displayed as “1” to “8”. Similarly, the rotational speed positions a to h of the large rotational speed adjustment volume 7 are sequentially displayed on the second display unit 10 as “1” to “8”, and the respective positions α to θ of the air amount adjustment volume 8 are the third. "1" on the display 11
It is sequentially displayed with "8".

FIG. 4 shows a blower 2 for combustion, an electromagnetic pump 3, each display section 9-
11 is a block diagram showing a control circuit 11; In the figure, reference numeral 13 is a CPU having a microcomputer configuration, and the adjusting volumes 6 to 8 are connected to the input side of the CPU 13. C
Each of the display units 9 to 11 is connected to the output side of the PU 13 via the drive circuits 14, 15 and 16, and the combustion blower 2 is connected to the output side of the PU 13 via the drive circuit 17 and the rotation speed converter 18.
Further, the electromagnetic pump 3 is connected via the drive circuit 19 and the frequency converter 20.

FIG. 5 is a flowchart showing the drive control of the combustion blower 2, the electromagnetic pump 3, and the display units 9 to 11 by the CPU 13. That is, it is determined which position among the rotational speed positions α to θ the small rotational speed adjustment volume 6 is set to (S1 to S8), and the level number corresponding to each set rotational speed position α to θ. "1" to "8" are displayed on the first display unit 9 via the drive circuit 14 (S9 to S1).
6). Next, it is determined which of the rotation speed positions a to h the large rotation speed adjustment volume 7 is set to (S17 to S24), and the level number “S” corresponding to each set rotation speed position a to h is set. "1" to "8" are displayed on the second display unit 10 via the drive circuit 15 (S25).
~ S32). Further, it is judged which position among the positions α to θ the air amount adjusting volume 8 is set to (S33 to S40), and each set position α is set.
Drive circuit 16 sets the number of levels “1” to “8” corresponding to
Is displayed on the third display unit 11 via (S41 to S4
8).

In this way, when the positions α to θ and a to h are set, a linear function for displaying the rotation speed of the combustion blower 2 and the frequency of the electromagnetic pump 3 is calculated (S49), and the linear function is handled. The signal to perform is output to the rotation speed converter 18 via the drive circuit 17, and the combustion blower 2 is controlled to the set rotation speed (S50). Moreover, the signal corresponding to this linear function is output to the frequency converter 20 via the drive circuit 19, and the electromagnetic pump 3 is controlled to the set frequency (S51).

A specific example of the drive control as described above will be described with reference to FIGS. 2 and 3. For example, when the rotation speed position γ is set by the small rotation speed adjustment volume 6, the rotation speed position c is set by the large rotation speed adjustment volume 7, and the position γ is set by the air amount adjustment volume 8, each display unit 9
"3" is displayed in -11 and the linear function (I) shown by the solid line in FIG. 3 is obtained. Also, each adjustment volume 6-
A wide variety of linear functions can be obtained by changing the setting of 8.

Therefore, even when the stove 1 is installed in a high place or a low place, the air density is changed, the ventilation resistance is increased due to the adhesion of dust or the like, or the discharge amount of the electromagnetic pump 3 is errored or the like, the optimum empty space is generated. The fuel ratio can be obtained.

In addition, as described above, each adjustment volume 6-
8, when changing the position “γ” of the air amount adjusting volume 8 to “δ”, the level number “3” on the third display unit 11 changes to “4” and the linear function (I) becomes a linear function. Change to (II). That is, this air volume adjusting volume 8
Is capable of constantly increasing or decreasing the air amount from the small rotation speed range of the combustion blower 2 to the high rotation speed range. Therefore, the user can easily adjust the air amount by the air amount adjusting volume 8 without adjusting the other rotation speed adjusting volumes 6, 7. In adjusting the air volume adjusting volume 8, the linear function (III) (I
When it is not possible to adjust the air amount by the air amount adjusting volume 8 as in V), etc., “0” is displayed on the third display section 11.

In the above embodiment, the positions of the adjusting volumes 6 to 8 are set in 8 stages, respectively, but the positions are not limited to this, and the small rotating speed range is 1070 rpm to 1560 rpm and the large rotating speed range is 1950 rpm to 2650 rpm. However, it goes without saying that it may be changed depending on the model of the heater.

(Effects of the Invention) As described above, according to the present invention, a large number of linear functions can be obtained by each adjustment volume, and the blower for combustion and the fuel supply pump can be controlled based on this linear function. It is possible to obtain an optimum air-fuel ratio without using a damper, with respect to changes in air density and changes in ventilation resistance due to changes in height. Moreover, the air amount can be adjusted easily by the air amount adjusting volume from a small rotational speed range of the combustion blower to a large rotational speed range, and the air amount can be easily adjusted.

[Brief description of drawings]

1 to 5 show one embodiment of the present invention. FIG. 1 is a perspective view showing a pot type oil stove, FIG. 2 is an enlarged front view showing an operation panel, and FIG. 3 is for combustion. Fig. 4 is a graph showing the characteristics of blower rotation speed-electromagnetic pump frequency, Fig. 4 is a block diagram showing a combustion blower, an electromagnetic pump, and a control circuit for each display unit, and Fig. 5 is a flowchart showing CPU drive control. In the figure, 1 ... Pot type oil stove, 2 ... Combustion blower, 3 ... Electromagnetic pump, 6 ... Small rotation speed adjustment volume, 7 ... Large rotation speed adjustment volume, 8 ... Air quantity adjustment volume, 13 ... CPU.

Claims (1)

[Scope of utility model registration request] 1. A combustion air-fuel ratio control device for a heating machine, which proportionally controls the amount of air by a combustion blower and the amount of oil by a fuel supply pump based on a linear function, wherein the rotation speed of the combustion blower is small. A small rotation speed adjusting volume for adjusting the rotation speed of the range based on a plurality of rotation speed positions having different rotation speeds, and a rotation speed in the high rotation speed range of the combustion blower is adjusted based on a plurality of rotation speed positions having different rotation speeds. A large rotation speed adjustment volume, an air volume adjustment volume for changing each rotation speed position set by each rotation speed volume equally in the increasing or decreasing direction of the rotation speed of the combustion blower, and set by each adjustment volume. Calculating means for calculating the linear function based on each rotational speed position, and the combustion based on the linear function obtained by the calculating means. Blower and combustion air-fuel ratio control system for heater characterized by having a drive control unit that drives the fuel supply pump.