JPH0781703B2 - Combustion control device - Google Patents

Description

Description: <Industrial application field> The present invention relates to a combustion control device for a heating appliance that heats a room.

<Prior art> Conventionally, in this type, the combustion amount is controlled to be high / medium / low or high / medium / low / stop according to the deviation between the present room temperature and the set temperature. The room temperature was kept at the set temperature.

<Problems to be solved by the invention> By the way, in this conventional one, when the caloric width between the respective combustion amounts is high as a whole, such as high / medium / low or high / medium / low / stop, in order to obtain heating, It feels uncomfortable at the time of switching, and the comfort is impaired.Also, even at the lowest low combustion amount, the calorie width is 1500 to 1300 kcal and it is not possible to perform fine room temperature control, especially when transitioning from low combustion amount to combustion stop and this On the contrary, it was impossible to obtain a good combustion control device for a heating appliance because the temperature difference was extreme.

<Means for Solving Problems> The present invention focuses on this point and solves the above-mentioned drawbacks. In particular, the configuration is such that the present room temperature detected by the room temperature detection means and the set temperature set at the set stage are set. Is output from the microcomputer to the combustion control circuit in accordance with the deviation of the above, and the combustion control circuit controls the combustion amount of a plurality of stages having a large caloric width set in advance, and the combustion amount of the plurality of stages having a large caloric width is maximum. When the combustion amount in the lower stage is reached, the microcomputer outputs to the subdivided combustion control means on condition that the deviation between the present room temperature and the set temperature and the input of the flame voltage set by the flame detection device for detecting the combustion state are input to the subdivided combustion control means. Indicates that the lowermost combustion amount is subdivided and controlled into preset combustion amounts having a small caloric width.

<Operation> The room temperature detecting means 2 detects the present room temperature and the desired room temperature is set by the temperature setting means 3, and the present room temperature signal detected by the room temperature detecting means 2 and the temperature setting means 3 are set.
The set temperature signal set by the above is input to a microcomputer 1 (hereinafter referred to as a microcomputer), the microcomputer 1 calculates this temperature difference at any time, and sends an output corresponding to the difference to a combustion control circuit to increase the calorie width. The amount of combustion in a plurality of stages is controlled from 6 stages of maximum 1 stage combustion to 6 stages of minimum, and the smaller the deviation between the present room temperature and the set temperature, the smaller the amount of combustion.

In addition, the 6th stage combustion amount, which is the lowest stage, has a smaller caloric width.
The combustion amount is subdivided and controlled in a plurality of 10 stages, that is, the combustion amount control signal of 6-stage combustion is output from the microcomputer 1 to the combustion control circuit 5, and the flame voltage from the flame detection device 4 is also supplied. When the microcomputer 1 receives the value and the flame voltage reaches a predetermined value, a signal is input from the microcomputer 1 to the subdivided combustion control means 6, and the combustion amount of the combustion section is lower than the combustion amount of the fifth stage by 30 kcal, that is, about 1170 kcal. The first fragmented combustion is performed, and when the flame voltage due to the first fragmented combustion continues to be a predetermined value for a predetermined time or longer, the microcomputer 1 detects this and outputs it again to the fragmented combustion control means 6 for combustion. The amount is further shifted to the second-generation differentiated combustion which is 30 kcal lower, and finally it is reduced to about 900 kcal, which is the minimum combustion amount of the fragmented combustion amount. Therefore, if the 6-stage combustion amount, which is the lowest stage of multiple stages with a large calorie width, is reduced, the 6-stage combustion amount is further subdivided into calorie widths, and finer combustion control can be performed, which is more comfortable. It is possible to obtain a heating space, and since the switching of the subdivided combustion amount is performed by checking the combustion state by the flame detection device 4, there is no concern of abnormal combustion that occurs when the combustion amount is lowered. ,
It is always safe to use, and it is economical because it saves fuel.

<Embodiment> Next, a combustion control apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.

Reference numeral 1 is a one-chip microcomputer having various functions such as storage, calculation, comparison, count, and timer.

Reference numeral 2 is a room temperature detecting means such as a thermistor, which detects the present room temperature and outputs this temperature signal to the microcomputer 1.

Reference numeral 3 is a temperature setting means capable of freely setting a desired room temperature, which is connected to the input side of the microcomputer 1 like the room temperature detecting means 2 and inputs a set temperature signal to the microcomputer 1.

Reference numeral 4 denotes a flame detection device composed of a flame rod or the like, which controls the combustion by detecting the combustion state of a combustion section (not shown), detects the flame voltage and inputs it to the microcomputer 1.

5 indicates the combustion amount of the combustor by the output from the microcomputer 1
Combustion control circuit that controls multiple stages of 00, 2700, 2100, 1600, 1200, 900 kcal and a large calorie range of 6 stages. Here, static pressure is applied to the fuel to supply fuel proportional to the combustion air. Combustion fan (not shown)
The number of rotations of is controlled by phase control.

Reference numeral 6 is a subdivided combustion control means which receives an input signal from the microcomputer 1 to the combustion control circuit 5 at the same time as an output signal of the 6th stage combustion amount which is the lowest stage of a plurality of stages having a large caloric width. It is set in advance to subdivide the combustion amount into multiple stages with a small caloric width in 10 stages at 30 rpm and a combustion amount of 30 kcal, and outputs a signal to the combustion control circuit 5, and a signal output to the next stage. After the combustion amount is switched, the flame detection device 4 outputs the flame voltage on the condition that the flame voltage is kept at a predetermined value, here 4 V or more for 2 seconds, that is, the detection signal from the microcomputer 1 is received.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

First, by operating the temperature setting means 3 to set a desired room temperature and then pressing an operation switch (not shown), combustion is started. Since the combustion amount at this time is in the initial stage of combustion, the set temperature and room temperature are set. The combustion is forcibly performed with the maximum combustion amount of the first stage regardless of the deviation from the The combustion amount is switched according to the deviation of the temperature, that is, the set temperature set by the temperature setting means 3 and the room temperature detected by the room temperature detecting means 2 are calculated and compared in the microcomputer 1, and the deviation value is calculated. Becomes larger than -3 ° C, the combustion amount is switched to the second stage combustion amount. Then, if the deviation between the room temperature and the set temperature is larger than + 0 ° C, and if it is larger than this, the third stage combustion amount is set, and The above deviation is larger than + 0.5 ℃ Then, the combustion amount becomes four stages, and when the deviation becomes larger than + 1.0 ° C, the combustion amount is switched to five stages, and this switching causes the microcomputer 1 to change the flame voltage from the flame detection device 4. A signal is received, and a signal is sent to the subdivided combustion control means 6 on condition that this voltage has continued for 2 seconds at a predetermined value of 4 V or more, and the subdivided combustion control means 6
Then, in response to this signal, the combustion control circuit 5 receives the five-stage combustion amount from
It outputs so that it burns with the first subdivided combustion amount of 1170 kcal, which is smaller by 30 kacl, and changes the combustion amount to a small amount. Conversely, if the flame voltage is less than 4 V or does not continue for 2 seconds, it is determined that there is poor combustion. The microcomputer 1 outputs the combustion amount to the combustion control circuit 5 so that it burns at the first-stage five-stage combustion amount, and again lowers the combustion amount from the fourth-stage combustion amount in the same manner as described above. After the chemical combustion, the first condition is that the flame voltage by the flame detection device 4 is 4 V or more and continues for 2 seconds.
The second subdivided combustion of 1140kcal, which is 30kcal smaller than the subdivided combustion amount, is performed, and the flame voltage is sequentially 4V or more, 2
3rd, 4th, 5th, 6th, 7th,
It decreases with the 8th and 9th subdivided combustion amounts, and if it is less than 4V and does not continue for 2 seconds during this period, it returns to the previous combustion amount and starts over. If the flame voltage is 4 V or more and continues for 2 seconds, the final stage will burn at the minimum combustion amount, which is the 10th subdivided combustion amount of 900 kcal. Of course, when the deviation changes during this period, it corresponds to each deviation value. It goes without saying that the combustion amount can be automatically switched to the specified combustion amount.

Therefore, the 6th-stage combustion amount with a large caloric range is subdivided into a plurality of stages for each minute combustion amount with a small calorie range, so that fine-grained combustion control can be performed and at the time of low combustion Since there is no significant change in the combustion amount, there is no discomfort, and a particularly comfortable heating space can be obtained as a heating device.

Further, since the switching of the subdivided combustion is performed on the condition that the normal state of the combustion is detected by the flame detection device 4, there is no fear of abnormal combustion and it can be used without anxiety, and good combustion can always be continued. Moreover, fine-grained combustion saves fuel and is economical.

In the present invention, the subdivided combustion control means 6 is provided outside the microcomputer 1, but is integrally provided inside the microcomputer 1 and the combustion control circuit 5 is provided.
Of course, it may be possible to directly control the.

<Effects of the Invention> In short, according to the present invention, the combustion control circuit is output in advance from the microcomputer to the combustion control circuit in accordance with the deviation between the current room temperature detected by the room temperature detection means and the set temperature set in the setting stage. A flame that controls the combustion amount of a plurality of stages having a large caloric width and detects the deviation between the present room temperature and the set temperature and the combustion state when the combustion amount of the plurality of stages having a large caloric width reaches the lowest stage fuel amount. The microcomputer outputs to the subdivided combustion control means under the condition of the input of the flame voltage set by the detection device, and the subdivided combustion control means sets the lowermost stage combustion amount in advance in a plurality of stages of small caloric width combustion. Since the amount of fuel is subdivided and controlled, the difference in the amount of combustion is large when switching the amount of combustion. Then, the difference can be reduced and the switching can be performed, the conventional feeling of discomfort can be prevented, finely controlled combustion can be performed, and a comfortable heating space that is close to natural as a heating appliance can be obtained. .

Further, since the above-mentioned switching of the subdivided combustion amount is performed on condition that the normal combustion state is confirmed by the flame detection device, there is no fear of abnormal combustion or the like that occurs when the low combustion amount is subdivided into a plurality of stages. It can be used with care and always obtains good combustion. Further, by subdividing the low combustion amount, fuel can be saved and an economical combustion device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a combustion control device according to an embodiment of the present invention, and FIG. 2 is a flow chart diagram thereof. 1 ... Microcomputer, 2 ... Room temperature detecting means, 3
...... Temperature setting means, 4 ... Flame detection means, 5 ... Combustion control circuit, 6 ... Subdivided combustion control means.

Claims (1)

[Claims] 1. A calorie which is output from a microcomputer to a combustion control circuit according to a deviation between a current room temperature detected by a room temperature detecting means and a set temperature set in a setting stage, and the combustion control circuit is set in advance. In addition to controlling the combustion amount in multiple stages with a large width, when the combustion amount in multiple stages with a large caloric width reaches the lowest stage combustion amount, a flame detection device that detects the deviation between the present room temperature and the set temperature and the combustion state is set. Output from the microcomputer to the subdivided combustion control means under the condition of the input of the flame voltage, and the subdivided combustion control means subdivides the lowermost stage combustion amount into a plurality of preset combustion amounts with a small caloric width. Combustion control device characterized by the above.