JPH05157363A - Hot air heater - Google Patents

Abstract

PURPOSE:To improve time reliability of indicated temperature by interrupting in a short time incorrect detected temperature indication of a temperature sensor different from a room temperature due to radiation heat from a heater upon re-starting of heating operation, and demonstrating correct temperature indication on a temperature indicator. CONSTITUTION:A fan 6 releases and circulates in a room mixed hot air of combustion gas from a heater 4 and room air for heating. A storage device 32 stores and keeps set temperature upon previous operation. A storage device 32 stores and keeps set temperature upon previous operation. An indication instruction unit 31 compares kept data in the storage device 32 with detection temperature of a temperature sensor 8, and judges whether or not detection temperature indication to a temperature indicator 14 should be done, and instructs it. Accordingly, accurate temperature indication is achieved at ail times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a temperature indicator of a warm air heater for heating a living room by circulating warm air.

[0002]

2. Description of the Related Art In recent years, hot-air heating equipment has stipulated a temperature indicator to properly control the indoor temperature more finely and accurately and inform the control status of the indoor temperature.

As shown in FIG. 4, this type of hot air heater is
Inside the main body 1 that constitutes the outer shell of the appliance, a heater 4 that burns fuel with a burner 2 to generate combustion gas 3, an intake filter 5 that sucks indoor air, and the indoor gas from the combustion gas 3 and the intake filter 5 An air blower 6 that inhales and mixes, and is discharged and circulated as warm air indoors, a temperature sensor 8 that detects the temperature of indoor air taken in by the air blower 6 (hereinafter also referred to as room temperature), a controller 9 that controls the operation of the equipment, and the like. Prepare Further, the main body 1 is provided with an operation switch 11 for instructing operation, a temperature indicator 12 for digitally displaying the temperature detected by the temperature sensor 8, and a temperature setter 13 for setting indoor air at a comfortable heating temperature.

When the operation switch 11 is turned on to set a desired room temperature with the temperature setting device 13, the heater 4 starts combustion and the blower 6 is driven, and the temperature sensor 8 detects the rise of the room temperature. And inputs the detection signal to the controller 9. The controller 9 displays the temperature on the temperature display 12 by the detection signal, and controls the combustion of the heater 4 so that the room temperature becomes the set temperature of the temperature setter 13. If the temperature indicator 12 is provided, it will be monitored as an indication of the heating condition, and the accuracy of the display has been required.

[0005]

However, in the above configuration, when the operation is stopped at the room temperature T _{S as} shown in FIG. 5, the blower 6 is used as the post purge for the time Δt ₁ and the operation is performed even after the combustion of the heater 4 is stopped. Then, the room temperature T _S is lowered by the temperature ΔT ₂ and the temperature displayed on the temperature indicator 12 is properly followed.

However, after the lapse of time t _1, the air in the main body 1 stays in the chamber and receives heat radiation from the heater 4 which has accumulated heat during combustion and rises by a temperature ΔT ₁ . After that, the heat is gradually released by natural circulation or the like, and the temperature gradually drops. If restarting is started during this temperature drop, only a slight decrease in temperature ΔT ₃ occurs at the start at time t ₃ in the figure, and the set temperature T is set by stopping operation from time t ₁ to time t _3.
Unlike the room temperature, which was lower than _S , the high temperature detected was displayed.

For this reason, there are problems that the temperature indicator 12 is erroneously judged to have failed, or the temperature difference between the displayed temperature and the actual room temperature gives a strange feeling, and the reliability of the temperature display is impaired. ..

Therefore, an object of the present invention is to stop the inaccurate temperature display on the temperature display and improve the reliability of the temperature display.

[0009]

In order to achieve the above object, the means of the warm air heater according to the present invention includes a heater that burns fuel to generate combustion gas, and sucks indoor air. A blower that mixes with the combustion gas of the heater to discharge hot air into the room, a temperature sensor that detects the temperature of the indoor air taken in by the blower, and a temperature indicator that displays the temperature detected by the temperature sensor In the initial stage of the restart of operation, the display indicator is provided to instruct the temperature indicator to stop displaying the detected temperature of the temperature sensor.

[0010]

With the above-mentioned means, the warm air heater according to the present invention heats the stagnant air in the appliance due to the heat released from the heater which has accumulated heat during the combustion after the combustion of the heater is stopped, and the temperature rises above the room temperature when stopped. Then, the temperature becomes higher than the actual room temperature. When the heater is reburned before this temperature is cooled down sufficiently, the display indicator gives an instruction to stop the temperature display detected by the temperature sensor, which is different from the actual room temperature. It is possible to improve the reliability of the temperature display by enabling accurate temperature display without giving a feeling of strangeness.

[0011]

Embodiments of the hot air heater according to the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 shows a control circuit of a hot air heater as an embodiment of the present invention, in which components given the same reference numerals as those in the conventional example have the same names and the same functions, and a structural description thereof will be omitted. ..
Further, the overall configuration in which the respective parts are combined is such that the controller 9 in FIG. 4 shown as a conventional example is replaced with the controller 20 surrounded by the one-dot chain line in this figure. And the controller 20
Is connected to the power cord 21 to obtain power, and the transformer 2
The rectifier 28 rectifies the power supply whose voltage has been reduced in step 7, the smoothing capacitor 29 smoothes it, and when the operation switch 11 is turned on, the detection signal of the temperature sensor 8 is input to the signal conversion circuit 30 to read the temperature. This interpretation signal is input to the display determination device 31, and the room temperature at the time of operation stop is input to the temperature storage device 32 for storage and storage. In addition to determining whether or not the temperature display is necessary, the display determiner 31 also gives instructions for operation control of appliances. Further, as shown in FIG. 3, the temperature indicator 14 includes a digital temperature indicator 15, a room temperature indicator 16, a set temperature indicator 17, and backlights 18, 1.
9 is provided.

Then, when the operation switch 11 is turned on and the desired room temperature is set and input by the temperature setting device 13, the temperature indicator 14 is instructed by the display determining device 31 according to the instruction from the display determining device 31.
The display of the temperature detected by the temperature sensor 8 determined by is started.
In addition, as shown in FIG. 2, the heater 4 starts to burn, and the blower 6 sucks indoor air from the intake filter 5 to heat the heater 4.
Mixed with the combustion gas 3 of
Raise the room temperature to heat the room. Eventually, when the room temperature reaches the set temperature T _S and the heating operation is continued, the heater 4 is heated by the radiant heat of the combustion gas 3 or the like and stores heat in the material used. When the operation switch 11 is turned off at the time t ₁ to stop the heating operation, the heater 4 immediately stops the combustion, and the blower 6 stops at the time t ₂ after the predetermined post-purge time Δt ₁ and this time t ₁ The combustion gas 3 is discharged into the room from the heater 4 and is replaced with room air. Then, the memory 32 stores the set temperature T _S.

When the heating operation is started and the temperature sensor 8 inputs a detection signal to the temperature determining device 30, the display determining device 31 which receives the determination signal compares the set temperature T _S with the detected temperature. In this operation, the display determiner 31, which has determined that the room temperature at the start is lower than the set temperature T _S , instructs the temperature indicator 14 to display the detected temperature of the temperature sensor 8 read by the temperature determiner 31, and the temperature indicator 14 Indicates that the detected temperature as the correct room temperature is turned on by the backlight 18 and the room temperature display 16 indicates the room temperature, and the digital display 15 displays a numerical value. When the heating operation is stopped at time t ₁ , it is not necessary to create a comfortable living room environment, the temperature indicator 14 does not need to be notified of the room temperature information, and the room temperature display is stopped because the value of the notification decreases. After the heating operation is stopped at the time t ₁ and the temperature display is stopped, the fan 6 is driven in the non-combustion state of the heater 4 at the post-purge time Δt ₁ , and the room temperature is lowered by the heat radiation effect to the outside of the living room. Now, in order to understand the operation, the temperature determiner 31 continues the reading operation of the detection signal of the temperature sensor 8, and the detection temperature of the temperature sensor 8 based on the reading signal is shown by a dashed line in the figure.

Further, the room temperature is gradually lowered by the heat radiation effect, and is lowered as shown by the broken line in the figure. The temperature change indicated by the one-dot chain line indicates that the time Δt ₁ coincides with the room temperature and indicates the temperature _TL almost at the lowest point at the time t ₂ , after which the air circulation by the blower 6 is stopped and the air in the device is After stagnation, the mechanical replacement with the indoor air is completed, and the natural convection replacement with a small flow rate at a slow speed due to the temperature difference between the stagnation air and the indoor air is performed. From the temperature _TL , the accumulated air in the device is heated by the radiation of the amount of heat stored in the heater 4 during combustion, and the temperature rises,
The maximum temperature T _P, which is higher by 5 to 10 ° C. than the set temperature T _S at the time of stop, is reached. The main body 1 heated by stagnant air radiates heat from the outer surface into the room, and the temperature T _P begins to gradually drop due to natural convection. During this time, the room temperature indicated by the broken line also continuously drops from the temperature T _L due to the heat radiation effect to the outside.

The temperature drop from the temperature T _P reaches the outdoor temperature after being left for a long time, but this arrival time varies depending on the temperature of the adjacent room, the heat insulation performance of the living room, and the like. At least the set temperature T _S
It takes 10 to 20 minutes to reach. And
Before room temperature the set temperature T _S is reduced, the heating operation time t ₃ is resumed at the same set temperature T _S, the temperature sensor 8
The detected temperature is T _H , which is higher than the set temperature T _{S as well as the} room temperature T _R. Therefore, the display indicator 31
Since the display of the temperature T _H , which greatly differs from the room temperature T _R , is an inaccurate display that gives the user a misunderstanding and a sense of discomfort, the storage device 32
Compared with the previous set temperature T _S stored saved, the temperature T _H
Is determined to be higher than the room temperature T _R, and the room temperature display on the temperature indicator 14 is stopped.

Instead, the temperature is not displayed even when the operation starts.
The temperature display should be accurate so as to cover the feeling of harmony.
In order to set temperature T_SAlso for the purpose of promoting reconfirmation of
Turn off the backlight 19 and display the set temperature.
Set temperature T_SSpecific number of
Is displayed on the digital display 15. The set temperature T _S
Is not displayed, and even if it is informed that the temperature display cannot be accurate
Good, but this set temperature T_SIs also used for the above multiple purposes.
Has the effect of achieving.

[0017] Unlike the case that started the operation from cold room at time 0, but stagnant air temperature in the device during the re-start is high and T _H, room temperature when starting the re-operation also gradually rises from the temperature T _R To do. Further, the stagnant air in the device is mechanically circulated by the blower 6 and is sequentially replaced with the room air, so that the stagnant air rapidly drops to the room temperature. Then, after about 5 to 10 seconds after the time t ₃ , the stagnant air in the device matches the set temperature T _S, and the display indicator 31 turns off the backlight 19 that has been turned on up to now, and instead, The backlight 18 is turned on. Thus, from this point in time, the numerical value displayed on the digital display 15 is also switched to the temperature detected by the temperature sensor 8. Since the room temperature is still the temperature T _Q and is low, there is a difference between the set temperature T _{S and} the display temperature. However, if the restart time t ₃ is further delayed, this difference becomes small. Soon after, when the room temperature rises due to the heating effect, the room temperature and the temperature detected by the temperature sensor 8 become the temperature T.
They match in _M , and after that no difference occurs between them.

In the above embodiment, even if the operation switch 11 is turned off, the previous set temperature T _S stored in the memory 32 is stored.
The memory 32 is equipped with a non-volatile so-called EEPROM so as not to be erased. However, there is another embodiment that is adopted in a normal portable and popular microcomputer, and in which the display indicator 31 can determine the display instruction even when the power is turned off by turning off the operation switch 11.

For example, as in the above embodiment, a reference temperature to be compared with the detected temperature is set in advance as a standard set temperature by predicting a drop in room temperature due to an operation stop. Since the reference temperature does not change for each operation like the set temperature, it may be input to the ROM incorporated in the portable microcomputer, which is simply non-erasable and memorized and stored, like the operation sequence control data. Further, there is also a method of directly managing time, unlike the method of temperature management in which the reference temperature and the detected temperature are compared to judge whether or not the room temperature is displayed at the time of restarting as in the above example.

For example, the behavioral characteristics of the air temperature stagnated in the equipment after the operation is stopped are grasped from experimental data and the like, and a predetermined time period during which the temperature T _P substantially coincides with the room temperature is determined based on standard installation and use conditions. The predetermined time may be input in advance in the ROM incorporated in the portable microcomputer and the display of the detected temperature may be stopped within the predetermined time. Further, even with the same time management method, in order to accelerate the display timing of the detected temperature, the time required for the detected temperature to reach the standard set temperature is predicted from the experimental data, and this time may be set to the predetermined time. Good.

[0021]

As clarified by the above detailed description, the warm air heater of the present invention stores the combustion heat from the previous operation when restarting operation within a short time after the previous operation stop. Even if the temperature sensor detects the stagnant air temperature in the equipment heated by the radiant heat of the heater, the blower replaces the high-temperature stagnant air with the low-temperature indoor air and restarts the temperature sensor. By restarting the operation until the detected temperature approaches the indoor air temperature, the temperature display will stop displaying the detected temperature. It is possible to display accurate temperature without giving the user a misunderstanding or discomfort, and it can be expected to improve the reliability of the temperature display.

[Brief description of drawings]

FIG. 1 is a control circuit diagram showing an embodiment of a warm air heater according to the present invention.

[Figure 2] Characteristic diagram of the same detection temperature

FIG. 3 is a block diagram of the temperature indicator.

FIG. 4 is a sectional configuration diagram of a conventional warm air heater.

FIG. 5 is a characteristic diagram of the same detection temperature, etc.

[Explanation of symbols]

 4 Heater 6 Blower 8 Temperature sensor 14 Temperature display 31 Display indicator

Claims (1)

[Claims] 1. A heater that burns fuel to generate combustion gas, a blower that sucks indoor air and mixes it with the combustion gas of the heater, and discharges warm air into the room, and indoor air that is sucked by the blower. A temperature sensor that detects the temperature, a temperature indicator that displays the temperature detected by the temperature sensor, and a display indicator that instructs the temperature indicator to stop displaying the temperature detected by the temperature sensor at the beginning of restarting within a short time. Hot air heater equipped with.