JP3562005B2 - Combustion control device - Google Patents

Description

[0001]
[Industrial applications]
The present invention circulates and heats the air inside and outside the apparatus, starts circulation heating again regardless of the temperature of the air inside the apparatus that has been heated due to the release of the heat storage amount of the heating apparatus when the circulation is stopped, and performs temperature control outside the apparatus. The present invention relates to a combustion control device such as a hot air heater.
[0002]
[Prior art]
In recent gas hot air heaters, heat exchangers and temperature sensors have been installed in close proximity with the downsizing of appliances, and the installation conditions of temperature sensors have deteriorated. On the other hand, temperature sensors have been developed to further improve energy saving. A combustion off control for operating or stopping the combustion and the air circulation based on the temperature information from has been added.
[0003]
For example, the gas warm air heater shown in FIG. 3 is separated from the outside by the appliance exterior 1 and the appliance base 2, sucks outside air from the outside air inlet 3, and detects the temperature with the thermistor 4 as a detection sensor. . A circulating device 7 having a blower fan 6 driven by a motor 5 draws in air outside the device, passes through a combustion chamber 10, and blows out the device to circulate. A heat exchanger 9 forming the combustion chamber 10 and a burner 8 for heating the intake air constitute a combustion chamber 10 (hereinafter, referred to as a heat exchange apparatus 10) as a heat exchange apparatus. Heating.
[0004]
FIG. 4 shows a block diagram of a conventional combustion control device. 4 is a thermistor. Reference numeral 11 denotes a room temperature detecting unit which converts the signal of the thermistor 4 into an electric signal and corrects it by a predetermined temperature deviation ΔT1. A room temperature setting unit 12 sets a desired room temperature, and a room temperature setting detecting unit 13 converts a value set by the room temperature setting unit into an electric signal. Reference numeral 14 denotes a temperature deviation detecting unit which calculates a difference between the electric signals obtained by the room temperature detecting unit 11 and the room temperature setting detecting unit 13. Reference numeral 15 denotes a temperature control unit, 16 denotes a combustion-off control unit, and constitutes 17 combustion control units. The combustion control unit 17 controls the circulation device 7 and the heat exchange device 10 illustrated in FIG.
[0005]
With the above configuration, the operation of the conventional combustion control device will be described with reference to a time chart of FIG.
[0006]
In FIG. 5, if an operation switch for turning on / off a gas hot air heater (not shown) is turned on at a time t0 after a sufficiently long operation stop, the circulation device 7 and the heat exchange device 10 start operating. When the circulating device 7 operates, the outside air flows into the device from the outside air suction port 3. This outside air is detected by the thermistor 4. The detected temperature VM of the thermistor 4 is converted into an electric signal by the room temperature detecting section 11 and sent to the temperature deviation detecting section 14.
[0007]
For example, at time t0 with respect to the average room temperature Vr, VMO = Vro, and at time t'0, the heat storage amount of the heat exchanger 9 is saturated, and ΔT1 = VMO'-Vro 'becomes substantially constant thereafter. That is, the thermistor 4 feels an extra temperature ΔT1 due to radiant heat from the heat exchanger 9 in addition to the actual room temperature Vr. This VM-ΔT1 = Vc is a correction temperature in the room temperature detecting unit 11, and after t′0, Vc ≒ Vr. In other words, the influence of the radiant heat from the heat exchange device 10 is constant when the circulating device 7 is operating, due to the relationship between the radiant heat and the heat balance due to the cooling action of the outside air and the heat capacity of the thermistor 4.
[0008]
The correction temperature Vc detected by the room temperature detecting unit 11 continues to detect an increase in the room temperature Vr. When Vc becomes equal to or higher than the set temperature, the temperature control controller 15 operates, and the combustion amount of the burner 8 and the rotation speed of the fan 6 for blowing air. To control the rise in room temperature. However, despite this, if the room temperature continues to rise and Vc (= Vr) becomes equal to or higher than the combustion off temperature, the combustion off control unit 16 outputs a signal to the heat exchange device 10 and the circulation device 7. Upon receiving this signal, the heat exchange device 10 stops (t1 in the figure).
[0009]
Further, the circulating device 7 operates for a certain period of time in order to lower the temperature inside the appliance, and then stops at t2. During this time, the correction temperature Vc in the room temperature detecting unit 11 gradually decreases due to the decrease in the room temperature Vr. However, if the operation of the circulation device 7 stops at time t2, the heat exchange device 10 releases the heat stored during the heating. Since the circulation of the outside air is stopped even though it continues for a certain period of time, the heat exchange device 10 heats the air in the appliance and detects the air temperature from point S to points P and Q.
[0010]
At this time, the outside air temperature (actual room temperature) Vr outside the appliance falls as shown by the solid line. The correction temperature Vc in the room temperature detection unit 11 also drops through a peak (time t3) as the amount of heat released from the heat exchange device 10 decreases, and when the temperature becomes lower than the combustion off temperature, the combustion off control unit 16 turns on the heat. An operation signal is output to the exchange device 10 and the circulation device 7, and the heat exchange device 10 and the circulation device 7 start operating again (at time t4). When the circulating device 7 operates, the corrected temperature Vc in the room temperature detecting unit 11 quickly becomes equal to the room temperature Vr.
[0011]
[Problems to be solved by the invention]
However, in the conventional combustion control device, when the combustion-off control device 16 stops the heat exchange device 10 and the circulation device 7, the correction temperature Vc in the room temperature detecting section 11 is larger than the actual room temperature Vr by a maximum ΔT2 (about 10 ° C.). ) High temperature is detected. Thereafter, the air inside the appliance is replaced with the air outside the appliance and drops. Eventually, the correction temperature Vc in the room temperature detection unit 11 becomes lower than the combustion off temperature, and the combustion off control unit 16 restarts the operation of the heat exchange device 10 and the circulation device 7. Because the temperature is ΔT3 (approximately 5 ° C.) lower than the corrected temperature Vc, the temperature control range is widened, and there is a problem that the user feels cold and reduces comfort.
[0012]
Therefore, the present invention is intended to prevent the actual room temperature at the start of reheating from dropping significantly below the combustion ON temperature under the operating conditions exceeding the combustion OFF temperature even if the "rising combustion" is proportional control combustion and the heating amount is reduced, even if the heating amount is reduced. Provided is a combustion control device that detects and provides comfort without a feeling of cold air as heating use performance.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a first means of the combustion control device of the present invention includes a device for circulating air inside and outside the device, a heat exchange device for heating the air inside the device, and a portion for receiving radiant heat of the heat exchange device. A sensor for detecting the temperature of the air before it is placed and sucked into the device and heated by the heat exchange device, a setting device for setting the temperature to be used, and a difference between the temperature signal of the detection sensor and the set temperature given by the setting device. When certain conditions are satisfied, a combustion-off control unit that stops operation of the heat exchange device and the circulation device, a combustion-off timer that counts a predetermined time after combustion-off, and after the combustion-off timer is up, the heat exchange device and A forced-combustion unit that performs the operation of the circulation device for a predetermined time; and a forced-combustion timer that counts the predetermined time. After the forced-combustion timer is up, the operation of the heat exchange device and the circulation device is performed. It is obtained by a said combustion off control unit for time control.
[0014]
Further, the second means of the present invention is a combustion-off timer that measures the timer lengths of the combustion-off timer and the forced combustion timer until a stop signal is output again after a stop signal is output from the combustion-off control unit. It has a combustion off timer and a forced combustion timer that are sequentially changed according to the value of the interval timer.
[0015]
Further, the third means of the present invention comprises a combustion off timer and a forced combustion timer for determining the timer length of the combustion off timer and the forced combustion timer based on a value of a detection sensor when the apparatus starts operation. It is a thing.
[0016]
Further, the fourth means of the present invention includes the timer length of the combustion off timer and the forced combustion timer, the value of the detection sensor when the apparatus starts operation, and the detection sensor after a lapse of a predetermined time from the start of operation. It is provided with a combustion off timer, a forced combustion timer, and a rising temperature detection timer that counts a predetermined period of time, which is determined based on a difference from the value.
[0017]
[Action]
By the first means, the combustion control device of the present invention circulates the air inside and outside the device with the circulation device, heats it with the heat exchange device, and raises the temperature of the air outside the device. It is placed at a place where the heat exchange device receives radiant heat, is sucked into the device, and the air temperature detection sensor before heating by the heat exchange device detects the air temperature outside the device. When the difference between the set temperature predetermined by the setting device and the detection sensor satisfies a certain condition, the combustion off control unit stops the operation of the heat exchange device and the circulating device and starts timing a predetermined time.
[0018]
When the counting of the combustion off timer ends, the forced combustion timer starts and the heat exchange device and the circulation device operate for a predetermined time regardless of the difference between the set temperature and the detection sensor. As a result, the heat exchange device emits radiant heat after the operation of the heat exchange device and the circulation device is stopped, and the temperature difference between the temperature detected by the detection sensor and the temperature outside the device due to heating up the air inside the device is forced. It is canceled when the combustion timer ends. In the above case, the reason why only the circulation device is not operated is to prevent a feeling of cool wind. In this way, the detected temperature that has become higher than the air temperature outside the device due to the radiant heat of the heat exchange device can be corrected, and comfort without the feeling of cool air as heating use performance is provided.
[0019]
Further, according to the second means, the present invention relates to a combustion off timer that measures time from when a stop signal is output from the combustion off control unit until a stop signal is output again, and a relationship between a timer length of a forced combustion timer and an apparatus. From the viewpoint that the user does not feel cold due to the expansion of the control range of the outside temperature, several types are obtained in advance through experiments and set as a combustion off timer and a forced combustion timer. The time from when the stop signal is output until when the stop signal is output again is measured by the combustion-off interval timer, and a predetermined value of the combustion-off timer and the forced combustion timer is selected based on this value. Thus, it is possible to cope with the room temperature load condition outside the apparatus, and the comfort is further improved.
[0020]
Further, according to the third means, the present invention relates to the relationship between the detection temperature of the detection sensor and the timer length of the combustion off timer and the forced combustion timer when the apparatus starts operating, by the expansion of the control width of the outside temperature of the apparatus. From the viewpoint that the user does not feel cold, several types are obtained in advance through experiments and set as a combustion off timer and a forced combustion timer. In this way, it becomes possible to cope with room temperature conditions such as cold or warm room temperature when the device starts operation, and the comfort is further improved.
[0021]
Further, according to the fourth aspect, the present invention provides a method for detecting a difference between a value of a detection sensor when the apparatus starts operation and a value of the detection sensor after a lapse of a predetermined time from the start of operation, and a timer for a combustion off timer and a forced combustion timer. The relationship between the lengths is determined in advance by experiments from the viewpoint that the user does not feel cold due to the expansion of the control range of the temperature outside the apparatus, and is set as a combustion off timer and a forced combustion timer. In this way, it is possible to respond to the load in the room where the device is operating, and the comfort is further improved.
[0022]
【Example】
Hereinafter, embodiments of the combustion control device of the present invention will be described with reference to the accompanying drawings. Except for the control circuit, the gas hot air heater as one embodiment of the present invention has the same configuration as the conventional example shown in FIG. 3, and the components denoted by the same reference numerals have the same names and the same functions as those in the description. Omit. FIG. 1 is a block diagram of a combustion control device according to the present invention. Reference numeral 18 denotes a room temperature detecting unit that converts a signal of the thermistor 4 into an electric signal. Reference numeral 19 denotes a room temperature setting unit for setting a desired room temperature, and reference numeral 20 denotes a room temperature setting detection unit for converting a value set by the room temperature setting unit into an electric signal. Reference numeral 21 denotes a temperature deviation detecting unit which calculates a difference between the electric signals obtained by the room temperature detecting unit 18 and the room temperature setting detecting unit 20.
[0023]
Reference numeral 22 denotes a temperature control unit, and 23 denotes a combustion-off control unit. Reference numeral 24 denotes a combustion-off timer, and the combustion-off control unit 23 outputs a predetermined time based on a combustion-off signal after the time-out. Reference numeral 25 denotes a forced combustion unit, which starts operating in response to a clock signal of the combustion off timer 24. Reference numeral 26 denotes a forced combustion timer, which starts operating in response to a time signal of the combustion off timer 24, and outputs a predetermined time after the time measurement. Reference numeral 27 denotes a combustion control unit, which includes a temperature control unit 22, a combustion-off control unit 23, a combustion-off timer 24, a forced-burn unit 25, and a forced-burn timer 26, and includes the circulation device 7 and the heat-exchange device 10 shown in FIG. Control.
[0024]
With the above configuration, the operation of the combustion control device of the present invention will be described with reference to a time chart of FIG. First, if an operation switch for turning on / off a gas hot air heater (not shown) is turned on at time t0 after a sufficiently long operation stop, the circulation device 7 and the heat exchange device 10 start operating. When the circulation device 7 operates, outside air flows into the inside of the device from the outside air suction port 3. The temperature of the outside air is detected by the thermistor 4.
[0025]
The detected temperature VM of the thermistor 4 is converted into an electric signal by the room temperature detecting section 18 and sent to the temperature deviation detecting section 21. The correction temperature Vc detected by the room temperature detector 18 detects a temperature that is lower by ΔT1 (for example, 1 ° C. to 5 ° C.) at time t0 because there is no influence of the radiant heat from the heat exchange device 10; Vc ≒ Vr due to heat. Here, ΔT1 is given after correcting the thermistor 4 or the room temperature detecting unit 18 in advance.
[0026]
Further, the influence of the radiant heat from the heat exchange device 10 is that when the circulating device 7 is operating, the radiant heat and the cooling of the thermistor 4 due to the flow of the outside air are balanced, and when the heat is stored up to the heat capacity of the thermistor 4, Is constant.
[0027]
The correction temperature Vc detected by the room temperature detector 18 continues to detect an increase in the room temperature. When Vc becomes equal to or higher than the set temperature, the temperature control controller 22 operates, and the combustion amount of the burner 8 and the rotation speed of the blower fan 6 are increased. To control the rise in room temperature. Nevertheless, when the room temperature continues to rise and Vc becomes equal to or higher than the combustion off temperature, the combustion off control unit 23 outputs a signal to the heat exchange device 10 and the circulation device 7. Upon receiving this signal, the heat exchange device 10 stops (t1 in the figure). Further, the circulating device 7 operates for a certain period of time in order to lower the temperature inside the appliance, and then stops at t2.
[0028]
During this time, Vc gradually decreases due to the lowering of the room temperature. However, if the operation of the circulation device 7 stops at time t2, the heat exchange device 10 releases the heat stored during heating for a while, Since there is no circulation of outside air, the heat exchange device 10 heats the air inside the appliance and detects the air temperature from point S to points P and Q. At this time, the outside air temperature (actual room temperature) Vr outside the appliance falls as shown by the solid line.
[0029]
The combustion-off timer 24 is stopped and output by the combustion-off control unit 23 and starts counting. The combustion-off timer 24 determines a predetermined time (a time during which the actual room temperature does not fall below the set temperature by experiment, and is about 5 minutes to 15 minutes). ) Is output to the forced combustion unit 25 and the forced combustion timer 26 after the time measurement (time t5). The forced combustion unit 25 starts counting by the output of the forced combustion timer 26 and reaches a predetermined time (actual actual temperature Vr ≒ corrected temperature Vc at the room temperature detecting unit 18) (time t'5 in the figure). Is a time sufficiently longer than the time determined by the experiment (time t'6 in the figure), and until the time is measured (about 3 to 5 minutes), the circulation device 7 and the heat exchange device 10 The operation is performed at the combustion amount (for example, an intermediate value between the maximum and the minimum).
[0030]
After measuring the time, the forced combustion timer 26 outputs a signal for stopping the operation of the forced combustion unit 26 and restarting the operations of the temperature adjustment control unit 22 and the combustion off control unit 23. During the period from t5 to t'5 in the figure, the circulation device 7 resumes its operation as described above, so that the air outside the device flows into the device from the outside air suction port 3 and lowers the ambient temperature of the thermistor 4 and heat. This can be explained by the balance between the radiant heat from the exchange device 10 and the cooling of the thermistor 4. In this way, it is possible to prevent the operation of the circulation device 7 and the heat exchange device 10 from restarting at the actual room temperature Vr lower than the set temperature. The present invention is also expected to be applied to cooking utensils and dryers that circulate air inside and outside the apparatus to heat and dry.
[0031]
As described above, according to the present embodiment, the combustion of the burner 8 is stopped at time t1, and only the circulation device 7 is operated until time t2, and during the combustion continuation time from time t0 to time t1 measured by the combustion off timer 24. The amount of heat stored in the heat exchange device 10 or the like is subjected to the first heat radiation operation between the time t1 and the time t2. The time (t2−t1) is calculated based on the temperature VM (= Vc + Δt1) measured at the times t0 and t1 and the required rise time (t1−t0). It is determined as a time when no feeling is felt.
[0032]
After the time t2, the circulation device 7 is also stopped for a while, so that the temperature of the air in the appliance is increased by heating due to the release of the heat stored in the heat exchange device 10 and the like, and the temperature Vc peaks at the time t3. A point P is shown, and then the temperature Vc is slightly lowered to the point Q due to heat radiation from the appliance exterior 1 or some natural air convection inside and outside the appliance. The time t5 at the point Q is experimentally given as a predetermined time from the time t2, and when the combustion off timer 24 measures, the forced combustion timer 26 measures time t6.
[0033]
At this time (t6-t5), the amount of heat radiation from the heat exchange device 10 and the like is reduced by the first heat radiation, so that the burner 8 is also burned to prevent the discharge of the wind having a cool wind feeling, while the time ( The air inside the appliance that has risen during t5-t2) is replaced with air outside the appliance and lowered. By the second heat radiation operation, most of the heat storage amount during the time (t1-t0) of the heat exchange device 10 and the like is released, and the temperature Vc thereafter can be made close to the room temperature Vr.
[0034]
【The invention's effect】
According to these means, generally speaking, after the actual room temperature Vr excessively drops and falls below the combustion ON temperature, combustion is finally restarted, and the heating room temperature becomes larger than the planned ON / OFF differential. Claim 1 of the combustion control device of the present invention is to circulate the air inside and outside the device with a circulating device and heat it with a heat exchange device to raise the temperature of the air outside the device so as not to feel uncomfortable due to excessive cooling. Keep doing. Eventually, when the difference between the set temperature and the detected temperature satisfies a certain condition and the operation of the heat exchange device and the circulation device is stopped, the combustion off timer measures a certain period of time and then forcibly burns the heat exchange device and the circulation device again. By forcibly operating only for the time set by the timer, and then making the temperature adjustment control unit and the combustion-off control unit perform the determination again, it is possible to realize comfort without a feeling of cool air as heating use performance.
[0035]
A second aspect of the combustion control apparatus according to the present invention is to change the lengths of the combustion-off timer and the forced-combustion timer according to the first aspect in accordance with the value of the combustion-off interval timer, so that the combustion control can be performed after the combustion is turned off. Since the return time and the forced combustion time are times corresponding to the respective heating environments, it is possible to more effectively prevent a feeling of cold air and improve the comfort.
[0036]
A third aspect of the combustion control apparatus according to the present invention is to determine the length of the above-described combustion off timer and the forced combustion timer based on a value of a detection sensor when the apparatus starts operation, thereby starting operation. It is possible to set a combustion-off timer time and a forced timer time corresponding to a change in room temperature at the time, and it is possible to effectively prevent a feeling of cold air regardless of a change in room temperature and to realize an improvement in comfort.
[0037]
The combustion control device according to the present invention is preferably configured such that the timer lengths of the combustion off timer and the forced combustion timer are determined by detecting the value of the detection sensor when the device starts operating and the value after a predetermined time has elapsed. By determining from the difference from the sensor value, it becomes possible to set the combustion off timer time and the compulsory timer time corresponding to the change in room temperature at the start of operation and the size of the house to be heated. Irrespective of the size, it is possible to effectively prevent a feeling of cold wind and improve comfort.
[Brief description of the drawings]
FIG. 1 is a block diagram of a gas heater of a combustion control device according to an embodiment of the present invention. FIG. 2 is a time chart of the device. FIG. 3 is a configuration diagram of a conventional combustion control device. FIG. Figure [Figure 5] Time chart of the same device [Explanation of symbols]
4 Thermistor (detection sensor)
7 circulation device 10 heat exchange device 24 combustion off timer 25 forced combustion part 26 forced combustion timer

Claims (4)

A circulating device that circulates air inside and outside the device, a heat exchange device that heats the air inside the device, and air that is arranged at a location that receives radiant heat from the heat exchange device, sucked into the device, and heated by the heat exchange device before heating. A detection sensor for detecting the temperature, a setting device for setting the heating temperature of the outside air of the device, and when the difference between the temperature signal of the detection sensor and the set temperature given by the setting device satisfies a certain condition, the heat exchange is performed. A combustion-off control unit for stopping the operation of the device and the circulation device, a combustion-off timer for counting a predetermined time after the combustion is turned off, and, after the combustion-off timer is up, operating the heat exchange device and the circulation device for a predetermined time. And a forced combustion timer for counting the predetermined time. After the forced combustion timer is increased, the operations of the heat exchange device and the circulation device are controlled again. Combustion control device including a combustion off control unit for. After the stop signal is output from the combustion-off control section, the timer length of the combustion-off timer and the forced-burn timer is sequentially changed according to the value of the combustion-off interval timer that is measured until the stop signal is output again. The combustion control device according to claim 1, further comprising a forced combustion timer. 2. The combustion control device according to claim 1, further comprising a combustion off timer and a forced combustion timer for determining the timer lengths of the combustion off timer and the forced combustion timer based on a value of a detection sensor when the device starts operating. A combustion off timer and a timer length of a forced combustion timer, a combustion off timer that is determined by a difference between a value of a detection sensor when the apparatus starts operation and a value of the detection sensor after a predetermined time has elapsed from the start of operation, 2. The combustion control device according to claim 1, further comprising a forced combustion timer and a rising temperature detection timer for counting a predetermined time.

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