JPH0648087B2 - Air-fuel ratio controller for combustion of heater - Google Patents

Description

Description: TECHNICAL FIELD 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 and 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 air-fuel ratio control is corrected by the damper in this way, the air amount changes greatly even when the opening of the damper is slightly changed. The fine adjustment of 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 provides an air-fuel ratio for combustion of a heating device that proportionally controls an air amount by a combustion blower and an oil amount by a fuel supply pump based on a linear function. 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. And a large oil quantity adjusting volume for adjusting the oil quantity in the large oil quantity region of the fuel supply pump based on a plurality of oil quantity positions having different oil quantities. And a computing means for computing the linear function based on the rotational speed position and the oil amount position set by the adjusting volume, and the combustion blower and the fuel supply pump based on the linear function obtained by the computing means. Drive control means for driving the.

(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 setting of the rotation speed position is changed, and the oil amount position in the large oil amount region is set by the large oil amount adjusting volume.

A linear function of the air-fuel ratio is calculated based on each of the set rotational speed positions and the oil amount position, 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-sealed pot-type oil stove, which has a pot burner (not shown) built therein. 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 each to the pot burner. Furthermore, stove 1
The front panel 4 is provided with an operation panel 5.

FIG. 2 is an enlarged front view of the operation panel 5. The operation panel 5 has a small rotation speed adjusting volume 6, a large rotation speed adjusting volume 7, an air amount adjusting volume 8 and a large oil amount adjusting volume 9 arranged laterally on one side thereof. On the other side of the operation panel 5, a first display unit 10 that displays the number of levels of the small rotation speed adjustment volume 6 and a second display unit 1 that displays the number of levels of the large rotation speed adjustment volume 7.
1. Displaying the number of levels of the air volume adjusting volume 8 Third
A display unit 12 and a fourth display unit 13 for displaying the number of levels of the large oil amount adjusting volume 9 are provided, respectively.
Nos. 13 to 13 are sequentially arranged from the end of the operation panel 5. Further, each of the display units 10 to 13 is composed of a 7-segment LED, and each of the display units 10 to 13 can display the number of levels "1" to "8". In addition, each adjustment volume 6-9
Is a push-button type volume that changes by one position each time it is pressed, and is repeatedly displayed as "1" ... "8""1" ... "8". Incidentally, 14 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 9. 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 each rotation speed position α to θ of the small rotation speed adjusting volume 6. The large oil amount adjustment volume 9 has a large oil amount range of 1
Oil level positions A to H in 6 levels from 6.75Hz to 19.75Hz
Can be adjusted. The rotation speed positions α to θ of the small rotation speed adjusting volume 6 are displayed on the first display unit 10 as “1” to
It forms a pair with "8", that is, it corresponds to "α" and "1" ... "θ" and "8", and the respective 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 set to the second
“1” to “8” are sequentially displayed on the display unit 11, and the respective positions α to θ of the air volume adjusting volume 8 are displayed on the third display unit 12.
Are sequentially displayed with "1" to "8", and the oil amount positions A to H of the large oil amount adjusting volume 9 are displayed with "1" on the fourth display section 13.
~ "8" are sequentially displayed.

FIG. 4 shows a blower 2 for combustion, an electromagnetic pump 3, each display unit 10.
It is a block showing the control circuit of ~ 13. In the figure, reference numeral 15 is a CPU having a microcomputer configuration.
The adjusting volumes 6 to 9 are connected to the input side of.
On the output side of the CPU 15, the drive circuits 16, 17, 18,
Each of the display units 10 to 13 is connected via 19 and the combustion blower 2 is connected via the drive circuit 20 and the rotation speed converter 21.
Is further connected, and the electromagnetic pump 3 is further connected via the drive circuit 22 and the frequency converter 23.

FIG. 5 is a flowchart showing the drive control of the combustion blower 2, the electromagnetic pump 3, and the display units 10 to 13 by the CPU 15. 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 10 via the drive circuit 16 (S9 to S).
16). 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 11 via the drive circuit 18 (S2).
5 to S32). Further, it is determined which position among the positions α to θ the air amount adjusting volume 8 is set to (S33 to S40), and the number of levels “1” to “1” corresponding to the set positions α to θ. 8 ”drive circuit 1
It is displayed on the 3rd display part 12 via 8 (S41-S4
8). Furthermore, it is determined which of the oil amount positions A to H the large oil amount adjusting volume 9 is set to (S49 to S56), and the adjustment level number corresponding to each of the set positions A to H. "1" to "8" are displayed on the fourth display unit 13 via the drive circuit 19 (S57 to S).
64).

As described above, when the positions α to θ, a to h, and A to H are set, the rotation speed of the combustion blower 2 and the electromagnetic pump 3 are set.
Is calculated (S65), a signal corresponding to this linear function is output to the rotation speed converter 21 via the drive circuit 20, and the combustion blower 2 is controlled to the set rotation speed. (S66). Further, a signal corresponding to this linear function is output to the frequency converter 23 via the drive circuit 22 to control the electromagnetic pump 3 to the set frequency (S6).
7).

A specific example of the drive control as described above will be described with reference to FIGS. 2 and 3. For example, the rotational speed position γ is set by the small rotational speed adjustment volume 6, the rotational speed position c is set by the large rotational speed adjustment volume 7, the position γ is set by the air amount adjustment volume 8, and the oil amount position C is set by the large oil amount adjustment volume 9. When set, each display unit 10
"3" is displayed in -13, and the linear function (I) shown by the solid line in FIG. 3 is obtained. Also, each adjustment volume 6-
By changing the setting of 9, various kinds of linear functions can be obtained.

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-
9, when changing the position “γ” of the air volume adjusting volume 8 to “δ”, the number of levels “3” on the third display unit 12 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 the adjustment of the air amount adjusting volume 8, when the air amount adjusting volume 8 cannot be adjusted like the linear functions (III) and (IV) of FIG. 3, “0” is displayed on the third display section 12. Is displayed.

In the above embodiment, the positions of the adjusting volumes 6 to 9 are set in 8 steps, respectively, but the position is not limited to this, and the small rotation speed range is 1070 rpm to 1560 rpm and the large rotation speed range is 1950 rpm to 2650 rpm. , Large oil volume range from 16.75Hz to 19.
Although it is set to 75Hz, 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 adjusting 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 adjustment volume, 9 ... … Large oil amount adjustment volume, 15 …… CP
U.

Claims (1)

[Claims] 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 adjusting volume, an air amount adjusting volume for changing each rotation speed position set by each rotation speed volume equally in a direction of increasing or decreasing the rotation speed of the combustion blower, and a large oil of the fuel supply pump A large oil amount adjusting volume for adjusting the oil amount in the quantity range based on a plurality of oil amount positions with different oil amounts, and each time set by each adjusting volume. A driving means for driving the combustion blower and the fuel supply pump on the basis of the linear function obtained by the computing means. An air-fuel ratio control device for combustion in a heater.