JP2002039627A - Space heater having air-cleaning function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a space heater having air-cleaning function, in which occurrence of such a malfunction of a sensor is prevented in judgement on a level of odor detection in an air-cleaning part in a warm-air heating operation, that is caused by reaction of an odor sensor provided in the air-cleaning part with an-pollution detection side, due to change in temperature and humidity at the time of warm air heating operation, and increase in concentration of flue gas. SOLUTION: An odor sensor 22 has a 1st detection sensibility (renewal interval Tc) during suspension of the warm air heating 3, and a 2nd detection sensibility (renewal interval Td) during the suspension of the warm air heating 3. The 2nd detection sensibility is made lower than the 1st detection sensibility (Tc>Td), and the sensibility setting is made so that an allowance is given to the reaction of an odor sensor 16 to a contaminated side in the operation of the warm air heating part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus having an air purifying function for purifying indoor air using odor detecting means for detecting the presence of an odor component from the detection output of an odor sensor.

[0002]

2. Description of the Related Art An air purifier for purifying indoor air is provided with a dust sensor or an odor sensor. When these sensors detect dust or odor in the room, the fan is automatically operated or the dust or odor is detected. This is notified to the user by a display, the capability of the fan is switched by a manual operation of the user who sees the display, and dust and an odor are removed by a dust collecting filter and a deodorizing filter.

An odor sensor used in this type of air purifier mainly detects odor components of tobacco (mainly hydrogen in odor components) and is generally formed of a metal oxide. Semiconductor gas sensors are widely used.

Here, a method of detecting an odor by a general odor sensor in an air purifier will be described. Semiconductor gas sensors used as odor sensors have the characteristic that their resistance decreases when they react to odor components, and the resistance varies depending on the environment (air component, temperature, humidity, etc. of the atmosphere) to which they are exposed. In general, a method of detecting the presence of an odor component based on the degree of change in the value to determine air contamination is used.

[0005] Referring to FIG. 8, a method of judging air contamination by the odor sensor will be described. The horizontal axis indicates time, and the vertical axis indicates resistance, resistance change rate, and stain determination level. The resistance value of the sensor is represented by rs, and the reference resistance value as a reference of the rate of change is represented by R. Stain is determined by the value of the rate of change in resistance (rs / R). After the power is turned on, the signal of the sensor after the lapse of T0 until the heater built in the sensor is stabilized is made valid.

The reference resistance value R is updated as follows. In the initial T0, the resistance value rs is set to the reference resistance value R. Resistance value r
When s increases (changes in the cleaning direction) and becomes larger than the reference resistance value R, the reference resistance value R is updated with the resistance value rs.
Until T1 when air pollution (Tx) occurs due to smoking or the like and the contamination is determined, the reference resistance value R is updated with the maximum value (cleanest value) of the resistance value rs between T every time T elapses. You. In addition, T1 that has determined that the dirt has been removed from T1.
Until 2, the reference resistance value R is fixed to the value at T1. In order to improve the sensitivity of the sensor, the value when the air is more clean is used as the reference resistance value R, and in order to cancel the change in the resistance value rs due to the temperature and humidity changes during the day, every fixed time T Redetermining the reference value is the idea of updating the reference resistance value R.

In a general air purifier, the renewal time T is about 15 to 20 minutes. Determination of dirt,
Judging from the resistance change rate (rs / R), the change rate is equal to the threshold A-
The stain level is set to 1 when the threshold value becomes 1, and the stain level is set to 2 when the threshold value becomes A-2, and the frequency of the stain determination level can be determined by the number of threshold values. In a general air purifier, a threshold value for initially determining dirt is about 0.85 to 0.8.

[0008]

Incidentally, this kind of semiconductor gas sensor has a characteristic that its detection sensitivity changes under the influence of temperature change and humidity. For this reason, there is no particular problem with the air purifier alone, but with a heating device with an air purifying function that has recently been provided, the detection sensitivity of the odor sensor changes due to the rapid temperature rise of the surrounding air at the start of heating (air There is a problem that the air purifying section malfunctions by reacting to the contaminated side. Further, in a heating apparatus having an open-type hot air heating unit using a heating means for burning oil or gas, the odor is affected by the humidity due to moisture generated during combustion, as in the case of temperature rise. There has been a problem that the detection sensitivity of the sensor changes (reacts to the air-contaminated side) and the air purifying unit malfunctions. In addition, there is a problem that the semiconductor gas sensor directly reacts to a combustion exhaust gas component of oil or gas and causes an air cleaning unit to malfunction.

The behavior of the odor sensor of the air cleaning unit when the heating operation is performed with the gas warm air heater having the temperature control function shown in FIG. 9 in the conventional example of the heating apparatus having the air cleaning function as described above will be described. The horizontal axis indicates time, and the vertical axis indicates resistance, resistance change rate, and room temperature change due to operation of the heating device. here,
The reference resistance value R, the rate of change in resistance (rs / R), and the stain determination method are based on the contents described based on the conventional example of FIG.

[0010] In the chart of the change in room temperature due to the operation of the heating equipment, the heating operation is started at T1 while the odor sensor performs the dirt determination, and the set temperature ts is reached at T2. After T2, the heating operation is continued while adjusting the heating amount so as to maintain the set temperature ts. Among them, the doors and windows of the room are opened for ventilation at T3, and closed at T4.
From 4 onward, the heating operation is continued. Accordingly, the resistance value rs of the odor sensor greatly decreases (changes in the direction of contamination) from T1 at the start of heating to the set temperature ts. This is caused by the fact that the room temperature greatly changes in a short time after the start of heating, and that the heating equipment operates at the maximum capacity until it reaches the set temperature, so that the influence of moisture and exhaust gas discharged during gas combustion is great. During the period from T2 to T3 when the temperature of the heating device is adjusted, the resistance value rs decreases but its degree is small. This is due to the fact that the set temperature ts is kept substantially constant, and the amount of gas combustion is reduced because the heating capacity is reduced by adjusting the temperature.

In addition, when ventilation is performed at T3, the outside environment of the sensor atmosphere changes completely because the cold, dry and fresh air comes into contact with the odor sensor, and the resistance value rs increases (changes in the clean direction). At the stopped T4, the environment of the sensor atmosphere adapts to the state of the room before ventilation, and the resistance value rs decreases (changes in the direction of contamination) to near the value before ventilation. Due to this change in the resistance value rs, the resistance change rate (rs / R) becomes
During the period from T1 to T2 after the start of the heating, and after T4 after the end of the ventilation, a large change in the decreasing direction is shown. As a result, it is erroneously determined that the air is dirty.

Also, during the period from T2 to T3 in which the heating operation is performed while controlling the temperature, the resistance change rate (rs / R) changes in a decreasing direction, and the margin with respect to the threshold value is small even when the air contamination due to odor is small. There is a possibility that erroneous determination that there is dirt is made by detecting a slight odor.

[0013]

In order to solve the above-mentioned problems, the present invention relates to a heating apparatus having an air purifying function provided with an odor detecting means for detecting the presence of an odor component from a detection output of an odor sensor. It is characterized in that the means switches the odor detection sensitivity in accordance with the operation state of the heating unit, and reduces the detection sensitivity during the operation of the heating unit.

According to the above-mentioned invention, the influence of disturbance factors such as a sudden change in room temperature, a change in humidity, and a combustion exhaust gas which occur during the heating operation in which the sensitivity of the odor sensor becomes sharp (changes to the side of air pollution) is determined by the odor detection means. By lowering the detection sensitivity, it is possible to prevent the odor sensor from reacting to disturbance elements other than the odor component to be originally detected, thereby preventing malfunction of the air cleaning unit during the heating operation.

[0015]

According to the first aspect of the present invention, there is provided an odor sensor comprising a semiconductor gas sensor, odor detection means for detecting the presence of an odor component from the detection output of the odor sensor, and an odor sensor comprising: In a heating device with an air purifying function provided with an air purifying unit including an air purifying fan that is operated based on detection of a detecting unit and a hot air heating unit including a temperature sensor that detects room temperature, The detection sensitivity of the odor detection means includes a first detection sensitivity when the hot air heating unit is stopped and a second detection sensitivity while the hot air heating unit is operating.
And the second detection sensitivity is lower than the first detection sensitivity. According to the present invention, the detection sensitivities during the time when the hot air heating unit is stopped and when the hot air heating unit is operating can be set separately from the first and second detection sensitivities. By lowering the sensitivity during operation, even if the output value of the odor sensor fluctuates in response to sudden changes in temperature, humidity, or changes in exhaust gas concentration during heating operation, it is erroneously detected as the presence of odor components. Without
As a result, malfunction of the air purifying section can be prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, the hot air heating unit and the air cleaning unit are simultaneously operated by providing control means for automatically operating the air cleaning fan upon detection of the odor detecting means. Even during the operation, the air purifying fan can be automatically operated based on the odor component detected by the odor sensor.

According to a third aspect of the present invention, in the first aspect of the present invention, the detection sensitivity of the second detection sensitivity of the odor detection means is set to zero (no sensitivity), so that the combustion exhaust gas component of oil or gas and the odor sensor are not detected. Even when the reaction component coincides, it is possible to reliably prevent the erroneous detection of the presence of the odor component due to the heating operation.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the hot air heating section has a temperature adjusting function for maintaining the room temperature at a set temperature based on the detection of the temperature sensor, and the detection sensitivity of the odor detecting means is not high. The third detection sensitivity from the start of operation during the operation of the air heating unit until the room temperature reaches the set temperature, and the fourth detection sensitivity after the temperature reaches the set temperature while the hot air heating unit is operating. And the third detection sensitivity is lower in sensitivity than the fourth detection sensitivity.

According to the present invention, the heating amount (fuel consumption amount)
There is a large amount of change in temperature and humidity from the start of heating operation to the set temperature until the temperature reaches the set temperature, and after the temperature control function operates with the heating amount reduced and the temperature and humidity change reaches the set temperature with relatively small change in temperature and humidity. Can be set and switched separately from the third and fourth detection sensitivities, and by lowering the sensitivity (third detection sensitivity) at the beginning of the heating operation, a sudden temperature change, humidity influence, and exhaust gas Even if it fluctuates in response to a change in the concentration, it is possible to prevent erroneous operation of the air purifying unit without erroneously detecting the presence of an odor component. In addition, by improving the sensitivity (fourth detection sensitivity) after the temperature reaches the set temperature, the detection level of the odor component can be improved even during simultaneous operation of the hot air heating unit and the air cleaning unit.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, the detection sensitivity of the third detection sensitivity, which is the sensitivity at the beginning of the heating operation, is set to zero (no sensitivity), so that the rapidity at the start of the heating operation. The reaction of the odor sensor in which disturbances such as the influence of temperature change and humidity and the change of exhaust gas concentration overlap can be eliminated, and it is possible to reliably prevent the erroneous detection of the presence of the odor component due to the heating operation.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the odor detecting means uses the detection value of the odor sensor in a clean state as a reference value until the odor component is detected. While the reference value is updated every predetermined time, the rate of change from the detected value of the odor sensor is determined based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold value. The determination of the contamination is performed based on the value of the rate of change, and the detection sensitivity of the odor detection unit is reduced by setting the update interval of the reference value shorter than the predetermined time.

According to a seventh aspect of the present invention, in any one of the first to fifth aspects of the present invention, the odor detecting means uses the detection value of the odor sensor in a clean state as a reference value and waits until the odor component is detected. While the reference value is updated every predetermined time, the rate of change from the detected value of the odor sensor is determined based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold value. Dirt is determined based on the value of the rate of change, and the detection sensitivity of the odor detecting means is reduced by providing a margin for setting the threshold.

In the eighth aspect of the present invention, in the first, second, fourth or fifth aspect, the odor detecting means uses the detection value of the odor sensor in a clean state as a reference value and waits until the odor component is detected. Calculates the rate of change from the detection value of the odor sensor based on the reference value while updating the reference value every predetermined time, and compares the change rate with a preset threshold to determine the presence of the odor component. By detecting and determining dirt with the value of the change rate, by providing a margin for setting the threshold value, the detection sensitivity of the odor detection means is reduced, and the detection sensitivity is reduced while detecting the odor component. When a switch occurs,
The reference value is obtained from the detection value of the odor sensor and the threshold value after the switching of the detection sensitivity, and the reference value is updated.

According to the present invention, even when the odor sensor detects the odor component, the operating state of the warm air heating unit changes, the odor detection sensitivity changes, and the threshold value is switched, the detection value of the odor sensor is detected. By calculating and updating the reference value from the threshold value after the sensitivity switching, the level of dirt determined at the time of switching can be continuously determined, and a state such as a dirt display due to a change in the operating state of the device. Changes can be prevented.

According to a ninth aspect of the present invention, in any one of the first to fifth aspects of the present invention, the odor detecting means uses the detection value of the odor sensor in a clean state as a reference value and waits until the odor component is detected. While the reference value is updated every predetermined time, the rate of change from the detected value of the odor sensor is determined based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold value. Then, when the detection value of the odor sensor becomes cleaner than the reference value, the reference value gradually becomes a detection value of the odor sensor with a time constant. The reference value has been updated.

According to the present invention, by setting the reference value to a cleaner value, the sensitivity to dirt (odorous component) is improved. In addition, the reference value gradually changes to the clean side with a time constant for the behavior in which the detection value of the odor sensor at the time of ventilation during the heating operation temporarily changes to the clean side and suddenly returns to the original state. Even if the detected value returns to near the original value after ventilation, the reference value is not updated to a large and clean value, and the rate of change is small. Erroneous determination that there is dirt is eliminated. This can prevent malfunction of the air purifying unit due to ventilation during the heating operation.

[0027]

Embodiments of the present invention will be described below with reference to the drawings showing Embodiments 1 to 4.

(Embodiment 1) FIG. 1 is a block diagram showing a circuit configuration of a control system of Embodiment 1 comprising an open-type heating apparatus provided with a hot air heating section for heating by burning gas and an air purifying section. It is. FIG. 2 is a configuration diagram illustrating a schematic configuration of the mechanical unit according to the first embodiment. In the first embodiment, as shown in FIG. 2, the inside of the apparatus main body 1 is vertically divided into approximately two parts, and the mechanical element of the air cleaning unit 2 is arranged on the upper side, and the mechanical element of the hot air heating unit 3 is arranged on the lower side. .

The mechanical element of the hot air heating unit 3 of the first embodiment is a gas burner 4 for burning a combustion gas such as city gas or LP gas.
, A hot air fan 6, a drive motor M1 for the hot air fan 6 (see FIG. 1), and a dust filter 8 attached to an intake port 7 opened on the back surface of the apparatus body 1. During heating, the hot air fan 6 is rotated by the drive motor M1 to drive the combustion unit 5 from the intake port 7 through the dust filter 8.
After the air is sucked into the inside and heated, the warm air is blown into the room by a warm air fan 6 from a warm air outlet 9 opened in the lower front part of the apparatus main body 1.

On the other hand, the mechanical elements of the air purifying section 2 include a filter section including a dust collecting filter 11 and a deodorizing filter 12 provided inside an air purifying air inlet 10 opened at an upper front portion of the apparatus main body 1, and a sirocco filter. An air cleaning fan (hereinafter referred to as an air cleaning fan) 13 comprising a fan and a drive motor M2 for the air cleaning fan 13 are rotated.
0, the air in the room is sucked in, the dust in the air is removed by a dust collecting filter 11, and the odor components in the air are removed by a deodorizing filter 12.
Air outlet 14 opened on the upper surface of the apparatus main body 1
Send more indoors.

As shown in FIG. 1, the circuit configuration of the air purifying section 2 and the hot air heating section 3 includes a driving section 20 of a driving motor M1 for the hot air fan 6, a joint having an electromagnetic valve and a proportional valve. A fuel supply unit 24 for supplying a fuel gas from a unit 26 (FIG. 2) to the gas burner 4, and an ignition unit 2 for igniting the gas burner 4
5, a temperature sensor 15 made of a thermistor and detecting an ambient temperature (room temperature) at room temperature; a flame detection sensor 18 made of a thermoelectric body and detecting ignition or extinguishing from the state of combustion flame of the gas burner 4; Driving unit 21 of driving motor M2 and photoelectric dust sensor 1 for detecting dust in the room
7, an odor sensor 16 composed of a semiconductor type gas sensor for detecting a gas (for example, a hydrogen gas component generated together with tobacco smoke <hereinafter referred to as an odor component>) which causes odor generated indoors, and an output of the odor sensor 16 Detecting means 2 for detecting the presence of an odor component on the basis of the odor component and determining the level of air contamination
2, various operation switches such as an operation switch and a room temperature setting switch, a display / operation unit 19 for displaying a room temperature display and an indicator for displaying an operation state, and a step-down and smoothing of a commercial AC power supply AC to obtain a DC voltage Vcc. DC power supply unit 27 for obtaining
It comprises a microcomputer and a control circuit section 23 which performs signal processing and control of the apparatus main body 1 as described later. Here, the odor detection unit 22 is also configured to be included in a part of the control circuit unit 23. Further, as shown in FIG. 2, an odor sensor 16 and a dust sensor 17 are arranged on the front surface of the apparatus main body 1 near the intake port 10, for example, so that the temperature sensor 15 faces the room near the intake port 7, for example.

Next, the overall operation of the first embodiment will be briefly described. The hot air heating unit 3 and the air cleaning unit 2 are operated only by the operation switches provided independently of each other on the display / operation unit 19 to operate only the hot air heating unit 3 and only the air cleaning unit 2.
3 that the hot air heating unit 3 and the air cleaning unit 2 operate simultaneously
A state operating pattern results.

The hot air heating section 3 is operated by the display / operation section 19 /
The operation and the stop are controlled by the control circuit unit 23 based on the stop operation. During the operation, the detected temperature detected by the temperature sensor 15 becomes the set temperature (target temperature). The proportional control valve of the fuel supply unit 24 is controlled by the control circuit unit 23 to control the fuel supply to the gas burner 4, and the combustion capacity is adjusted.

On the other hand, when the operation switch of the display / operation unit 19 is turned on, the air cleaning unit 2 is in a standby state, and the control circuit unit 23 controls the air cleaning fan 13 based on the detection output of the odor sensor 16 or the dust sensor 17. And automatically displays the state of air contamination on the display / operation unit 19.

Here, the odor sensor 16 used in the first embodiment
Consists of a semiconductor gas sensor mainly composed of a gas-sensitive body (not shown) made of a metal oxide mainly composed of tin oxide or the like. Further, the odor sensor 16 includes a heater (not shown) for heating the gas-sensitive body.
The temperature of the gas-sensitive body can be set to a high or low temperature state by being controlled by the control unit 3. In order to mainly remove smoke from cigarettes as in the case of the odor sensor 16, when hydrogen gas when tobacco is burned is to be detected as an odor component, it is set to a high temperature state and used.

Odor sensor 16 composed of a semiconductor gas sensor
Has a characteristic that the resistance value of the sensor decreases when exposed to the odor component to be detected. Since the resistance value varies depending on the environment (air component, temperature, humidity) to which the odor sensor 16 is exposed, the odor detection means 22 detects the presence or absence of air contamination (the presence of odor component) based on the degree of change in the resistance value. Then, dirt is determined.

3 and 4, a method of determining air contamination using the odor sensor 16 according to the first embodiment will be described.
The signal processing and control described below are performed by the odor detection means 22 and are realized by a microcomputer.

FIG. 3 is a time chart showing a stain determination method when the warm air heating unit 3 is stopped and only the air cleaning unit 2 is operating. The horizontal axis indicates time, and the vertical axis indicates resistance, resistance change rate, and stain determination level.

The outline of each chart will be described. The chart showing the resistance values shows the resistance value rs of the sensor and the reference resistance value R determined based on the resistance value rs of the sensor. Resistance change rate φ
Is represented by equation (1) and can take a value from 0 to 1.

Φ = rs / R ‥‥‥‥‥‥‥ (1) Since the resistance value rs of the sensor decreases when exposed to contaminated air, the smaller the value of this resistance change rate, the greater the degree of contamination. I can say. Further, the stain determination level indicating the degree of stain is determined by comparing the resistance change rate φ with a determination threshold to determine the level of stain. In the first embodiment, the stain level is 0
In order to judge air stains in four stages of stain level 3 from (clean state), three levels of determination thresholds are prepared.
The dirt levels 0 and 1 are determined from 0 to 1 by the threshold Lc−
From 1 and 1 to 0 are determined by the threshold value L'c-1, and the magnitude relation of the threshold value is expressed by Expression (2).

(Lc−1) <(L′ c−1) ‥‥‥‥‥‥‥ (2) Even when the resistance change rate φ is close to the threshold value and stable, the dirt level is stably determined, so that the dirt level is determined in the change direction. When a different threshold value is set and the stain level is displayed on a display such as an LED, consideration is given to preventing unnecessary flickering of the LED. It is sufficient that there is a difference of about 0.03 to 0.05 in the resistance change rate.
Similarly, the determination of the dirt levels 1 and 2 is based on the threshold Lc-2.
And the threshold value L'c-2, and the dirt levels 2 and 3 are determined by the threshold value Lc-3 and the threshold value L'c-3. The threshold of each level has a level difference of 0.05 to 0.1, and the magnitude relation is expressed by Expression (3).

(Lc-1)>(Lc-2)> (Lc-3) ‥‥‥‥‥‥‥ (3) To describe the resistance value in more detail, the resistance value rs is determined by setting the resistance value of the odor sensor 16 to 1 Alternatively, the change is described by sampling at intervals of about 2 seconds. After the operation of the air purifying section 2 is started, the heater temperature stabilization time T0
The resistance value is made valid from the resistance value rs0 after the lapse. This shows a state in which indoor air pollution (around Tx) occurs due to alcohol or the like generated during smoking or cooking, and the resistance value is greatly reduced.

The reference resistance value R is a reference value for determining the rate of change of the sensor resistance value, and is determined as follows.

First, at the contamination level 0 where the air is clean, the resistance value rs0 is set to the reference resistance value R in the initial T0. When the resistance value rs increases (changes in a direction in which the air becomes clean) and becomes larger than the reference resistance value R, the reference resistance value R is updated with the resistance value rs. Resistance value rs
Decreases (changes in the direction of contamination) and becomes smaller than the reference resistance value R, the reference resistance value R remains unchanged. Also, the time T
Each time c elapses, the reference resistance value R is updated with the maximum value (the cleanest value) of the resistance value rs between Tc. This is repeated every time Tc elapses. This is because the reference resistance R is set to a resistance value when the air is more clean in order to detect a large change in dirt at the time of air contamination, and a constant value is set in order to cancel the resistance value change due to temperature and humidity changes in a day. This is because redefining the reference value every time is a concept of updating the reference resistance value R.

Next, when the air pollution occurs and the contamination is detected, the reference resistance value R is maintained at the value at T1 at which the contamination determination level 0 is determined. In addition, the operation of the air purifying unit 2 eliminates air pollution, and the updating of the reference resistance value R is restarted at T2 when the clean soil level 0 is determined. At T2, the resistance value rs is set to the reference resistance value R, and after T2, the update is performed every time the time Tc elapses as in the initial stage. This is because the sensor resistance value during air pollution cannot be set to the reference value.

FIG. 4 is a time chart showing a method for judging air contamination when the operation of the warm air heating unit 3 is started and the air purifying unit 2 is operated at the same time. The horizontal axis is time, the vertical axis is resistance,
It shows the resistance change rate and the stain determination level.

The outline of the method of determining the resistance value rs, the reference resistance value R, the resistance change rate φ, the determination threshold value, and the dirt determination level conforms to the contents described in FIG. The difference in the method of updating the reference resistance value R is that the update time of the reference resistance value R is Td while the hot air heating unit 3 is operating. Further, the count of Td is started at the time of operation of the warm air heating unit 3, and the reference resistance value R is updated with the resistance value rs at that time. The difference in the determination of the contamination level is that the determination threshold is different between when only the air cleaning unit 2 is operating and when the simultaneous operation with the hot air heating unit 3 is performed. The determination of the dirt levels 0 and 1 is the threshold Ld-1 and the threshold L'd-1. Similarly, the determination of the dirt levels 1 and 2 is the threshold Ld-2 and the threshold L'd-2. The determination of the stain levels 2 and 3 is based on the threshold Ld-3 and the threshold L'd-3. Expression of update time and condition of each judgment threshold
(4) is represented by equation (5).

Tc> Td ‥‥‥‥‥‥‥ (4) (Lc-1)> (Ld-1) ‥‥‥‥‥‥‥ (5) Next, when the hot air heating unit 3 is operated, The behavior of the resistance value rs will be described. When the hot air heating unit 3 starts operating, the resistance value rs of the sensor decreases as if the air was contaminated due to factors such as an increase in indoor temperature, an increase in humidity, and an increase in the concentration of combustion exhaust gas. For this reason, in the method of determining dirt when the hot air heating unit 3 is stopped shown in FIG. 3, the air purifying unit 2 detects air contamination every time heating is performed, and the multifunction peripheral has an inconsistent operation (so-called malfunction). ). Therefore, in the first embodiment illustrated in FIG. 4, in the simultaneous operation with the hot air heating unit 3, the reference resistance value R is updated with the resistance value rs at the start of the operation of the hot air heating unit 3. The reference update time is set shorter than when only the air cleaning unit 2 is operated (when the hot air heating unit 3 is stopped), the change in the resistance value is reduced before updating, and the threshold value for the dirt determination is set to the hot air heating unit 3. By setting it smaller than that at the time of stop, and having a margin for a change due to the hot air heating operation, malfunction can be prevented. In other words, by switching the setting of the update time and the threshold value, the detection sensitivity to dirt can be reduced, and malfunction can be prevented.

In the first embodiment shown in FIG.
Minutes, Td is 10 minutes. Lc-1 is set to 0.8, and Ld-1 is set to 0.7 to 0.6.

Tc and Lc-1 are constants as they are, and only the air cleaning unit 2 maintains the detection sensitivity during operation.
By setting Td to 0 minutes or Ld-1 to 0.0, the detection sensitivity at the time of operation of the warm air heating unit 3 can be eliminated. Embodiment 1 describes a gas warm air heater,
In the case of burning oil, the degree of the pollution component of the air to which the odor sensor 16 reacts increases, and thus, eliminating the detection sensitivity is a means for reliably preventing malfunction. Also smell sensor 1
When a sensor corresponding to a living odor other than cigarette smoke (hydrogen gas at the time of combustion) is newly installed as the detection target of No. 6, the emission component of the combustion gas may coincide with the detection component of the odor sensor 16. Even if it occurs, malfunction can be prevented by eliminating (making it zero) the detection sensitivity during simultaneous operation with the hot air heating unit 3. When the detection sensitivity of the odor sensor 16 is lost, the dust sensor 17 is mounted together with the odor sensor 16 as in the first embodiment.
Thus, the operation of the air cleaning unit 2 can be controlled by monitoring the air contamination.

(Embodiment 2) In Embodiment 2, as in Embodiment 1, FIG. 1 is a block diagram showing a circuit configuration of a control system of an open-type heating apparatus, and FIG. ,
FIG. 3 is a time chart illustrating a method of determining air contamination when the hot air heating unit 3 is stopped and only the air cleaning unit 2 is operating. The difference from the first embodiment is a method of determining dirt when the operation of the hot air heating unit 3 is started and the air cleaning unit 2 is operated at the same time. FIG. 5 is a time chart.

FIG. 5 is a time chart showing a method for judging air contamination when the hot air heating unit 3 is operated and is operated simultaneously with the air cleaning unit 2. The horizontal axis indicates time, the vertical axis indicates resistance, the change in room temperature due to the operation of the hot air heating unit 3, the resistance change rate, and the contamination determination level.

The hot-air heating unit 3 starts operation at time T1, and the temperature detected by the temperature sensor 15 becomes the set temperature ts.
Up to 2, operation at the maximum combustion capacity (gas combustion amount), T2
Thereafter, the operation is performed while adjusting (decreasing) the combustion capacity so as to maintain the room temperature at the set temperature ts.

The outline of the method for determining the resistance value rs, the reference resistance value R, the resistance change rate φ, the determination threshold value, and the dirt determination level conforms to the contents described with reference to FIG. The difference in the method of updating the reference resistance value R is that the update time of the reference resistance value R is Td1 until T2 when the hot air heating unit 3 burns at the maximum capacity, but the reference time after T2 once reaches the set temperature ts. Update time Td of resistance value R
It is different from 2. Further, it is to start counting Td1 when the warm air heating unit 3 reaches T1, and to update the reference resistance value R with the resistance value rs at that time. The differences in the determination of the contamination level are as follows: between T1 and T2 (operation at the maximum combustion capacity) when only the air cleaning unit 2 is operating and at the time of simultaneous operation with the hot air heating unit 3; (Adjustment operation). Between T1 and T2,
The determination that the determination threshold is the dirt level 0 or 1 is based on the threshold Ld1-1.
And the threshold value L'd1-1. Similarly, the dirt levels 1 and 2 are determined by the threshold Ld1-2 and the threshold L'd1-2, and the dirt levels 2 and 3 are determined by the threshold Ld1-3 and the threshold L'd1-3. It is. After T2, the determination of the dirt levels 0 and 1 is based on the thresholds Ld2-1 and L'd2-1. Dirt levels 1 and 2
Is determined by the threshold value Ld2-2 and the threshold value L'd2-2, and the determination of the dirt levels 2 and 3 is performed by the threshold value Ld2-3 and the threshold value L'd2-3. The conditions of each update time and each determination threshold are represented by Expressions (6) and (7).

Tc>Td2> Td1 ‥‥‥‥‥‥‥ (6) (Lc-1)>(Ld2-1)> (Ld1-1) ‥‥‥‥‥‥‥ (7) The behavior of the resistance value rs when the heating unit 3 operates will be described. When the warm air heating unit 3 starts operating, the resistance value rs of the sensor becomes as if the air was contaminated due to factors such as an increase in the temperature of the room, an increase in the humidity, and an increase in the concentration of the combustion exhaust gas, as in the first embodiment. Decreasing. Therefore, after the start of operation (T1), the temperature reaches the set temperature ts (T
Until 2), the temperature difference from the start of operation is large, and since the fuel burns at the maximum capacity, the concentration of moisture and exhaust gas is high, and the resistance value rs of the odor sensor 16 greatly decreases in the pollution direction. on the other hand,
Once the temperature reaches the set temperature ts (T2), the room temperature becomes substantially constant and the combustion capacity decreases, so that the decrease in the resistance value of the odor sensor 16 is relatively small even when the hot air heating unit 3 is operating. Has become.

In the second embodiment shown in FIG. 5, the operation time of the warm air heating unit 3 is set by separately setting the update time of the reference resistance value R and the judgment threshold between T1 and T2 and after T2. Thus, the detection sensitivity of the odor sensor 16 can be switched. During the simultaneous operation with the hot air heating unit 3, the heating operation is performed and the reference resistance value R is updated with the resistance value rs when the set temperature ts is reached. By setting the update time to be longer than the reference update time until the set temperature ts is reached, and setting the dirt determination threshold to be longer than the reference update time to reach the set temperature ts, the warm-air heating unit 3 performs temperature controlled combustion. During this time, the detection sensitivity can be sharpened, and the reaction sensitivity to odor components that should be detected can be improved. At the same time, at a timing when the cause of the change (change in the contamination direction) of the odor sensor 16 until the temperature reaches the set temperature ts is large, the threshold value is set with a margin against the influence of the hot air heating operation as in the first embodiment. This can prevent malfunction of the air cleaning unit 2.

In the second embodiment shown in FIG. 5, Tc is 2
0 minutes, Td2 is 15 minutes, Td1 is 10 minutes. Lc-1
Is 0.8, Ld2-1 is 0.75, Ld1-1 is 0.7
It is set to 0.6.

Further, Tc, Lc-1 and Td2, Ld2
Td1 is 0 minute while maintaining the detection sensitivity of the odor sensor 16 in the temperature-controlled combustion state occupying most of the time when only the air purifying section 2 is in operation and when heating is used.
Alternatively, by setting Ld1-1 to 0.0, it is possible to eliminate the detection sensitivity at the beginning of the heating operation (until the set temperature ts is reached) in which the combustion effect of the warm air heating unit 3 is large. Due to the difference in the maximum combustion capacity of the warm air heating unit 3 and the size of the room in which the equipment is used, the inclination of the temperature change and the degree of change in the indoor moisture and the concentration of the combustion exhaust gas differ, and the odor sensor 16
The degree of influence on the change in the resistance value also differs depending on each situation. When various usage conditions are considered, by setting the detection sensitivity to zero, the operation of the hot air heating unit 3 and the air cleaning unit 2
Can be reliably prevented from malfunctioning.

(Third Embodiment) In the third embodiment, as in the first embodiment, FIG. 1 is a block diagram showing a circuit configuration of a control system of an open-type heating apparatus, and FIG. ,
FIG. 3 is a time chart showing a dirt determination method when the hot air heating unit 3 is stopped and only the air cleaning unit 2 is operating. FIG. 5 is a time chart showing a dirt determination method when the operation of the hot air heating unit 3 is started and the air cleaning unit 2 is operated at the same time as in the second embodiment. Example 3
The difference from the second embodiment is that when the dirt determination level 1 or more is determined, the stop or operation state of the hot air heating unit 3 changes, and the reference resistance value when the determination threshold of the dirt determination level switches is determined. This is a method for updating R, and FIG. 6 shows a time chart.

FIG. 6 shows a dirt determination method and reference resistance when the air purifying unit 2 detects dirt during the temperature control operation of the warm air heating unit 3 and the warm air heating unit 3 is stopped during the dirt detection. It is a time chart which shows the update method of value R. The horizontal axis indicates time, the vertical axis indicates resistance, the change in room temperature due to the operation of the hot air heating unit 3, the resistance change rate, and the contamination determination level.

The hot-air heating unit 3 continues to operate so as to maintain the room temperature at the set temperature ts. For example, spraying of sprays causes contamination of the indoor air (around Tx), and the air cleaning unit 2
The smell detecting means 22 determines the dirt at T1 (dirt determination level 1). Further, the air pollution advances, and the stain determination level 2 is determined. At this time, the ability of the air purifying fan 13 of the air purifying unit 2 and the degree of dirt on the dirt display on the display / operation unit 19 are controlled in accordance with the dirt determination content. In this state, when the warm air heating unit 3 is stopped by a user's operation at the time of Toff, the dirt determination threshold is switched. Hot air heating unit 3
During operation, the resistance change rate φ, the determination thresholds Ld2-2 for the dirt determination levels 1 to 2 and the determination thresholds Ld2-3 for the dirt determination levels 2 to 3 have the relationship of equation (8). After the stop, when the resistance change rate φ and the determination threshold Lc-3 of the dirt determination levels 2 to 3 have the relationship of Expression (9), the control method of the second embodiment switches the dirt determination level from level 2 to level 3. Will be replaced.

(Ld2-3)>φ> (Ld2-2) ‥‥‥‥‥‥‥ (8) φ> (Lc-3) ‥‥‥‥‥‥‥ (9) Operation of Hot Air Heating Unit 3 When there is a change in the state, the determination threshold is switched, so that the determination level changes depending on the value of the resistance change rate φ, and a problem arises that the operating state of the air cleaning fan 13 and the dirt display state change.

In the third embodiment, when a change occurs in the judgment threshold value during the detection of air pollution, the current judgment level and the resistance value r are changed so that the current contamination judgment level is maintained.
The difference from the second embodiment is that the reference resistance value R is estimated and updated from s. For example, in Toff, when the dirt determination level is 2 during the operation of the hot air heating unit 3, the reference resistance value R is estimated and updated according to the equation (10) after the hot air heating unit 3 is stopped.

R = rs / (Lc−n) ‥‥‥‥‥‥‥ (10) (n is a dirt determination level, 1 to 3) After the hot air heating unit 3 is stopped, the resistance change rate φ switches. In order to correct the reference resistance value R so as to be equal to the subsequent determination threshold Lc-2, the determination level continuously maintains the dirt determination level 2 before the threshold switching. After switching, judgment level 3
Is satisfied, the resistance change rate φ is equal to or greater than Lc−3, and the determination level is 1
Is required to be less than L′ c−2, but when the reference resistance value R is estimated and updated, the equation (11) is obtained.
Holds, and the stain determination level 2 is maintained.

(Lc-3)> {φ = (Lc−2)}> (L′ c−2)} (11) In FIG. 6, the hot air heating unit 3 Has been described when the operation is stopped from the temperature controlled combustion state. However, when the hot air heating unit 3 is changed from the stoppage to the operating state during the dirt determination, when the set temperature ts is reached by the heating operation, etc.
By correcting and updating the reference resistance value R at the same time when the value of the dirt determination threshold is switched, it is possible to prevent erroneous determination of the dirt level that occurs when the operation of the warm air heating unit 3 is switched, and the air purifying unit. 2 can be prevented from malfunctioning.

In the first embodiment, when the detection sensitivity during the operation of the hot air heating unit 3 is not zero, the reference resistance value R
Is corrected, it is possible to prevent a similar malfunction that occurs when the hot air heating unit 3 is operated / stopped.

Embodiment 4 Embodiment 4 differs from Embodiments 1 to 3 in the method of updating the reference resistance value R. Resistance value rs at dirt determination level 0 (clean state)
Increases (changes in the cleaning direction) and becomes larger than the reference resistance value R, the reference resistance value R is being updated while gradually increasing at a constant time constant with the resistance value rs changing every moment as a target.

FIG. 7 is a time chart showing a method of determining air contamination and a method of updating the reference resistance value R when the warm air heating unit 3 starts operating and operates simultaneously with the air cleaning unit 2. The horizontal axis indicates time, the vertical axis indicates resistance, the change in room temperature due to the operation of the hot air heating unit 3, the resistance change rate, and the contamination determination level.

When the reference resistance value R is updated when the contamination determination level is 0, the resistance value rs0 is used as the reference resistance value R in the initial T0. After T0, when the resistance value rs increases (changes in a direction in which the air becomes clean) and becomes larger than the reference resistance value R, the reference resistance value R is updated with a resistance value with cleaner air. In the first to third embodiments, the resistance value rs is directly updated, but in the fourth embodiment, the resistance value rs is updated while gradually increasing the value of the reference resistance value R with that value as the target. The resistance value rs changes in a stable or decreasing direction,
Update is continued until the reference resistance value R reaches the resistance value rs. 7, the reference resistance value R is changed from rs0 to r.
The state changing to s1 is shown.

In FIG. 7, the warm air heating unit 3 starts operating at T1, the room temperature reaches the set temperature ts at T2, and the temperature control operation is continued thereafter. When the window or door is opened to ventilate the room at T3, the odor sensor 16 is exposed to fresh air (usually having a lowered temperature, a lower humidity, and a lower concentration of flue gas) in a different outdoor environment.
The resistance value rs rapidly increases (changes in the cleaning direction). When the window or door is closed at T4 after ventilating for about 1 minute, the atmosphere of the odor sensor 16 adapts to the state of the air in the room before the ventilation, and the resistance value rs is a value almost close to the resistance value at the time T1 before the ventilation. (Change in the direction of contamination). The change in the reference resistance value R at this time is represented by rs
Even if the resistance value decreases after T4, the resistance value rs and the reference resistance value R have the relationship of the equation (12), and the resistance change rate φ is 1 or more. In the fourth embodiment, when the resistance change rate φ is 1 or more, it is treated as 1 and the contamination level is determined.

Rs ≧ R ‥‥‥‥‥‥‥ (12) Accordingly, even if the post-ventilation resistance value rs decreases (changes in the direction of contamination), no dirt is detected, and the warm air heating unit 3 is operated. Malfunction of the air cleaning unit 2 due to ventilation or the like can be prevented.

As the ventilation time (between T3 and T4) becomes longer, the reference resistance value R increases, but the degree of replacement of indoor air increases, and the return of the resistance value rs after the end of ventilation decreases. It tends to be. For this reason, the resistance change rate φ does not change so much even if a difference in the length of the ventilation time occurs.

The time constant for updating the reference resistance value R in the fourth embodiment is updated at about 5 to 20 Ω / sec when the resistance value of the odor sensor 16 is several tens (kΩ). The change in the increasing direction of the resistance value rs which normally occurs in the clean air is affected by the temperature and the humidity, but is very gentle. The change in the resistance value rs due to ventilation during heating is so rapid that it does not occur due to the change in the natural environment. Both resistance values r
The change rate of s is experimentally determined, and in a normal state, the update of the reference resistance value R sufficiently follows, and a time constant for canceling the update during ventilation during heating is set.

In the fourth embodiment, a description is given of a device in which the hot air heating unit 3 and the air purifying unit 2 are combined. However, a general air purifier is also used simultaneously with a heating device. Therefore, the fourth embodiment is an effective means for preventing malfunction.

[0075]

As described above, according to the present invention, in a heating device having an air purifying function in which a warm air heating unit and an air purifying unit are integrated, the odor detecting means of the air purifying unit is provided with a hot air heating unit. The first detection sensitivity and the second detection sensitivity have different detection sensitivities when the unit is stopped and during operation, respectively, so that the second detection sensitivity is lower than the first detection sensitivity. Therefore,
Even if the odor sensor responds to the contamination detection side due to a change in the room temperature due to the operation of the warm air heating unit, a change in humidity, an increase in the concentration of the combustion exhaust gas, etc., the second detection sensitivity is lowered to allow a margin for the reaction, It is possible to prevent an erroneous operation of the air purifying unit due to erroneous detection of the presence of the odor component by the odor sensor when the hot air heating unit and the air purifying unit are simultaneously operated. At the same time, when the hot air heating section is stopped (when only the air cleaning section is operated), only the first detection sensitivity is provided to detect air dirt (odor components) with high sensitivity regardless of the influence of the hot air heating section operation. It has an effective effect.

Further, the air purifying fan of the air purifying section is controlled based on the odor component detected by the odor detecting means to control the air purifying ability. Therefore, even in the heating device with the air purifying function, it is possible to automatically operate the air purifying unit by the odor sensor.

Further, by setting the second detection sensitivity of the odor detection means to zero (no sensitivity), it is possible to use oil as a fuel and burn it to generate a lot of odor components, such as the characteristics of the hot air heating section and the odor. Even when the characteristics of the sensor and the detection gas do not match, it is possible to reliably prevent the malfunction of the air cleaning unit due to the erroneous detection by the odor sensor due to the operation of the warm air heating unit.

Further, in the apparatus provided with a temperature control function for keeping the room temperature at the set temperature, the odor detecting means makes the room temperature reach the set temperature from the start of operation while the hot air heating section is operating. And the fourth detection sensitivity after the room temperature reaches the set temperature from the start of operation while the hot air heating unit is operating, and the third detection sensitivity is higher than the fourth detection sensitivity. I try to lower it. Therefore, the difference between the reaction of the odor sensor to the contaminated side caused by combustion at the maximum capacity at the start of operation of the hot air heating unit and the reaction of the odor sensor to the contaminated side caused by combustion with reduced capacity during temperature controlled combustion. By setting the third detection sensitivity with a margin for the reaction to the large pollutant side that occurs at the start of operation, it is possible to prevent the malfunction of the air cleaning unit due to the erroneous detection of the odor sensor due to the operation of the hot air heating unit. Can be prevented. At the same time, by setting the fourth detection sensitivity in accordance with the level of a relatively small reaction that occurs during temperature controlled combustion, the dirt detection sensitivity of the air cleaning unit during temperature controlled combustion, which accounts for most of the operation time of the hot air heating unit, is reduced. Can be improved.

Further, by setting the third detection sensitivity of the odor detection means to zero (no sensitivity), there is a difference in the reaction of the odor sensor due to the difference in the maximum capacity of the warm air heating unit and the size of the room used. Even in such a case, it is possible to reliably prevent the malfunction of the air cleaning unit due to the erroneous detection of the odor sensor due to the operation of the warm air heating unit.

Further, when the operating state of the hot air heating unit is changed while detecting the contamination of the air and the detection sensitivity is switched,
The odor detection means corrects the sensitivity after the switching so that the currently determined dirt level is continued. Therefore, it is possible to prevent a malfunction such as a change in the dirt determination level of the air cleaning unit due to a change in state such as operation / stop of the hot air heating unit.

When the reference value is updated to the clean side in order to improve the detection sensitivity of the odor sensor in the case where the contamination is determined based on a change from the reference value, the clean side is gradually replaced with a time constant. Update to Therefore, it is possible to absorb a sudden change in the output of the odor sensor caused by the ventilation at the time of the warm air heating, and to prevent a malfunction of the air cleaning unit caused by the ventilation during the heating.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a heating device with an air purifying function according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of a mechanism of the heating device with the air cleaning function.

FIG. 3 is a time chart showing a method of detecting an odor in an air purifying section of the heating device with the air purifying function.

FIG. 4 is a time chart illustrating a method of detecting an odor in an air purifying unit of the heating device with an air purifying function according to the first embodiment of the present invention.

FIG. 5 is a time chart illustrating a method for detecting an odor in an air purifying unit of a heating device having an air purifying function according to a second embodiment of the present invention.

FIG. 6 is a time chart illustrating a method of detecting an odor in an air purifying unit of a heating device with an air purifying function according to a third embodiment of the present invention.

FIG. 7 is a time chart illustrating a method of detecting an odor in an air purifying unit of a heating device with an air purifying function according to a fourth embodiment of the present invention.

FIG. 8 is a time chart showing a method of detecting an odor of a conventional air purifier.

FIG. 9 is a time chart showing changes in an odor sensor when another conventional air cleaner and a heating device are used simultaneously.

[Explanation of symbols]

 Reference Signs List 2 air cleaning unit 3 hot air heating unit 12 deodorizing filter 13 air cleaning fan 15 temperature sensor 16 odor sensor 22 odor detection means 23 control circuit unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Itsuo Igarashi 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Tetsuya Hiraoka 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi F-term in Osaka Gas Co., Ltd. (reference) 3L028 EA01 EB03 EC04

Claims (9)

[Claims] An odor sensor comprising a semiconductor gas sensor, odor detection means for detecting the presence of an odor component from the detection output of the odor sensor, and an air purifying fan operated based on the detection of the odor detection means. In a heating device with an air purifying function provided with an air purifying section equipped with a hot air heating section equipped with a temperature sensor for detecting room temperature, the detection sensitivity of the odor detecting means is such that the hot air heating section is stopped. The first detection sensitivity during the operation and the second detection sensitivity during the operation of the hot air heating unit
A heating device having an air cleaning function, comprising: a detection sensitivity; and wherein the second detection sensitivity is lower in sensitivity than the first detection sensitivity. 2. The heating device with an air purifying function according to claim 1, further comprising control means for automatically operating the air purifying fan upon detection of the odor detecting means. 3. The heating device with an air purifying function according to claim 1, wherein the detection sensitivity of the second detection sensitivity of the odor detection means is zero (no sensitivity). 4. The hot-air heating unit has a temperature adjustment function for maintaining the room temperature at a set temperature based on the detection of the temperature sensor, and the detection sensitivity of the odor detecting means is set to start while the hot-air heating unit is operating. A third detection sensitivity until the room temperature reaches the set temperature, and a fourth detection sensitivity after the set temperature is reached while the hot air heating unit is operating, and the third detection sensitivity is the third detection sensitivity. 4. The sensitivity is lower than the detection sensitivity.
A heating device with an air purifying function as described. 5. The heating device with an air purifying function according to claim 4, wherein the detection sensitivity of the third detection sensitivity of the odor detection means is zero (no sensitivity). 6. The odor detecting means uses a detection value of the odor sensor in a clean state as a reference value, and until the odor component is detected,
While the reference value is updated every predetermined time, the rate of change from the detection value of the odor sensor is obtained based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold. 6. The method according to claim 1, wherein the determination is made based on the value of the change rate, and the detection sensitivity of the odor detection unit is reduced by setting a reference value update interval shorter than the predetermined time. A heating device with an air purifying function according to claim 1. 7. The odor detection means uses a detection value of the odor sensor in a clean state as a reference value, and until the odor component is detected,
While the reference value is updated every predetermined time, the rate of change from the detection value of the odor sensor is obtained based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold. 6. The method according to claim 1, wherein the determination is made based on a value of a change rate, and the detection sensitivity of the odor detection unit is reduced by providing a margin for setting the threshold. 7. Heating device with air purifying function. 8. The odor detection means uses a detection value of the odor sensor in a clean state as a reference value, and until the odor component is detected,
While the reference value is updated every predetermined time, the rate of change from the detection value of the odor sensor is obtained based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold. Judgment is made by the value of the change rate, and by setting a margin for the setting of the threshold value, the detection sensitivity of the odor detection means is reduced, and the detection sensitivity is switched during detection of the odor component. 6. A heating unit with an air purifying function according to claim 1, wherein a reference value is obtained from a detection value of the odor sensor and a threshold value after switching of the detection sensitivity, and the reference value is updated when the detection occurs. apparatus. 9. The odor detection means uses a detection value of the odor sensor in a clean state as a reference value, and until the odor component is detected,
While the reference value is updated every predetermined time, the rate of change from the detection value of the odor sensor is obtained based on the reference value, and the presence of the odor component is detected by comparing the rate of change with a preset threshold. Dirt is determined by the value of the change rate, and when the detection value of the odor sensor becomes cleaner than the reference value, the reference value gradually becomes a detection value of the odor sensor with a time constant. The heating device with an air cleaning function according to claim 1, wherein the reference value is updated.