JPH04217715A - Air-heater - Google Patents

Abstract

PURPOSE:To improve the feeling of air-heating at the start-up of heating operation, stabilize the burner operation and quickly stabilize the room temperature without excessive heating due to a high heating amount. CONSTITUTION:At the start-up, operation is carried out with a large heating amount that has no relation to temperature controls performed by a temperature controller 32 according to thermistor 23 and a temperature setting switch 26. The time period of start-up operating controls is controlled according to the output voltage of a thermocouple 22 provided on a heating source.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater that is operated at a large heating capacity in which the heating capacity of the heating source is independent of the set temperature or room temperature at the initial stage of operation.

0002

[Prior Art] For example, in heaters such as hot air heaters, in order to improve the feeling of heating at the beginning of operation, in those that use a burner as a heat source, it is necessary to improve the ignitability of the burner or to adjust the temperature of the burner. In order to quickly stabilize the combustion state of the burner by increasing the temperature quickly, for a while at the beginning of operation, the heating amount of the heating source is set to the maximum temperature, regardless of the indoor temperature or set temperature. An initial operation is performed in which operation is performed with a relatively large amount of heating, such as the amount of heating. This initial operation is controlled by a control circuit such as a microcomputer that performs ignition control and temperature control, and in that case, the duration of the initial operation is determined by the control board that forms the control circuit, even for burners that use different gas types. In order to make it possible to use the burner at a constant rate, the time required for the combustion state of the burner to become stable is set to a relatively long fixed time depending on the type of gas.

0003

[Problem to be solved by the invention] However, in this way,
For heaters that initially operate with a large amount of heat, the large amount of heating continues for a certain period of time each time they start operation. Accordingly, when the heating source is restarted in a temperature control system that temporarily stops the heating source such as a burner and then restarts the heating source as the indoor temperature decreases, the indoor temperature increases due to the large amount of heating in the initial operation. The temperature tends to rise rapidly, resulting in overshoot, and in the case of the latter, where the temperature is controlled by stopping and restarting the heating source, the interval between stopping and restarting the heating source becomes short, resulting in an increase in indoor temperature. The problem is that it tends to become unstable.

An object of the present invention is to quickly stabilize the indoor temperature by eliminating unnecessary heating caused by a large amount of heating while improving the feeling of heating and stabilizing the burner at the initial stage of operation.

[0005]

[Means for Solving the Problems] The present invention comprises a room temperature detection means for detecting an indoor temperature and a temperature setting means for setting a target temperature, the temperature detected by the room temperature detection means and the temperature setting means It has a temperature control function that controls the heating amount of the heating source based on the target temperature, and at the beginning of heating of the heating source, the heating amount of the heating source is set to a large heating amount regardless of the temperature controlling function. A heating device that performs an initial operation, comprising a temperature detection means for detecting the temperature of the heating source, and a technical means for determining the operation time of the initial operation based on the temperature detected by the temperature detection means. shall be.

[0006]

[Operation] In the present invention, at the beginning of operation, an initial operation is performed in which the heating amount of the heating source is a large heating amount that has no relation to the set temperature or room temperature. The operation time of this initial operation is determined based on the detected temperature of a temperature detection means provided in the heating source to detect the temperature, for example, depending on whether the temperature of the heating source rises quickly or slowly, or The time required for the temperature of the source to reach a predetermined temperature is determined. If the temperature rises quickly, the initial operation time is shortened, and if the temperature rises slowly, the initial operation time is lengthened. As a result, the heating source starts up quickly because the temperature of the heating source is high, so that the heating source can be activated again immediately after the heating source has finished operating. Since the initial operation time is shortened, unnecessary heating is not performed and the indoor temperature is less likely to rise too much. On the other hand, if the temperature of the heating source is low and the start-up is slow, such as starting operation after the heating source has been stopped for a long time, and the operation time with a large amount of heating is required, it is necessary to start the operation after the initial operation. Since the time is longer, the temperature of the heating source quickly rises and the temperature of the heating source is likely to be stabilized. After the initial operation with a large amount of heating is completed, a temperature control operation is performed based on the target temperature and the indoor temperature, and the indoor temperature is stabilized.

[0007]

[Effects of the Invention] According to the present invention, the operating time of the initial operation is determined based on the temperature of the heating source, and it is determined whether the heater is operating or not based on the temperature of the heating source or a change in temperature. Therefore, when the temperature of the heating source is low, the operating state of the heating source can be quickly stabilized. For example, when the burner is heated If the burner is used as a source, the combustion state of the burner can be quickly stabilized. Further, when the temperature of the heating source is high and the indoor temperature is high, the initial operation time is shortened, so excessive heating due to a large heating amount is eliminated, and overshoot is suppressed. As a result, the indoor temperature can be quickly stabilized.

[0008]

EXAMPLES Next, the present invention will be explained based on examples. In the stationary gas hot air heater 1 whose external shape is shown in FIGS. 2 and 3, an outer casing 2 is formed from several members made of metal plates and resin, and the outer casing 2 includes:
An indoor air intake port 3 and a combustion air intake port 4, each consisting of a plurality of small openings, are provided at the upper part of the back surface, and a warm air outlet 5 for blowing out warm air is provided at the lower part of the front surface.
The indoor air intake port 3 and the suction port 4 are covered by a filter 6 that is removably provided in the outer casing 2.

As schematically shown in FIG. 4, a convection duct 7 is provided inside the outer casing 2, with the suction port 4 and the hot air outlet 5 serving as upstream and downstream ends, respectively. A convection fan 8 using a convection duct 7 as a blower casing and driving a once-through type impeller 8a by a DC motor 8b is arranged near the hot air outlet 5 inside.

The hot air outlet 5 is provided with a louver 9 for changing the degree of opening of a part of the hot air outlet 5 and for changing the hot air blowing direction in the vertical direction. 30 rotates according to the operating state to control the blowing state or blowing direction of the airflow passing through the convection duct 7.

On the other hand, a burner 10 as a heating source is arranged upstream of the convection fan 8 in the convection duct 7.
The high temperature combustion gas generated in the burner 10 is transferred to a convection fan 8
With the operation of the indoor air intake port 3, the warm air is mixed with the indoor air taken in from the indoor air intake port 3, and the hot air is blown out from the hot air outlet 5.

Inside the air guide pipe 11 that guides combustion air from the suction port 4 to the burner 10 is a fuel supply path 1 that guides fuel gas.
A nozzle 13 is disposed at the downstream end of the nozzle 2, and the fuel gas ejected from the nozzle 13 flows into the mixing chamber 14 together with the combustion air.
and is burned in the burner 10.

The fuel supply path 12 includes two solenoid valves 15,
16, and a governor proportional valve 17 that adjusts the amount of fuel gas supplied to the burner 10 by adjusting the supplied gas pressure in accordance with the current value.

In the vicinity of the burner 10, there are provided an ignition electrode 21 for producing a spark discharge for ignition, and a thermocouple 22 for monitoring the combustion state of the burner 10. Further, a thermistor 23 is provided inside the suction port 4 to detect the indoor temperature.

The upper surface of the outer casing 2 of the gas hot air heater 1 is provided with an operation switch 24 for instructing to start and stop operation, and an operation display section covered by a resin opening/closing lid 25. The display section houses a plurality of switches such as a temperature setting switch 26 for indicating the operating status and an off timer switch for stopping the operation after a certain period of time, and a display device for displaying the target temperature, etc. .

The gas hot air heater 1 having the above configuration has the following features:
It is controlled by a control device 30 whose functional configuration is shown in FIG.

The control device 30 consists of a microcomputer (hereinafter referred to as "microcomputer") equipped with various input circuits and a drive circuit for driving each section by the microcomputer, and these control the operation control section 31, temperature control, etc. Control part 3
2. A louver control section 33 and several other functional sections are formed.

The operation control section 31 starts operation in a predetermined sequence in response to the operation signal of the operation switch 24, and
Ignition control of the burner 10 is performed, and predetermined extinguishing control is performed according to the operation of the operation switch 24 during combustion. Further, following the ignition control, ignition detection is performed based on the output voltage Va of the thermocouple 22, and when the output voltage Va of the thermocouple 22 exceeds a certain voltage, it is determined that the ignition detection state is present, and then the thermocouple 22 output voltage Va
Initial operation control is performed based on.

In the initial operation control, the temperature control section 3 described later
The burner 10 is caused to burn at the large heating amount set regardless of the heating amount based on the temperature control according to No. 2. Here, combustion is performed with a large heating amount set at level 8, which is higher than level 7 as the maximum heating capacity determined by the temperature adjustment control unit 32.

Particularly in this embodiment, the operation time of the initial operation control with a large heating amount is determined each time the initial operation control is performed based on the output voltage Va of the thermocouple 22 close to the burner 10. For this purpose, the operation control section 31
, the output voltage Va of the thermocouple 22 is at a predetermined first level.
The functional units include an output change detection unit 31a that determines whether or not the reference voltage V1 has been reached, and a timer 31b that measures the time t from the start of initial operation control until the first reference voltage V1 is reached. It is provided. If the gas operation is started when the gas is cold, the combustion state of the burner 10 will not stabilize until 30 seconds or more have passed, but if the operation is stopped once while the gas operation is in progress, then restart the operation. In this case, the output voltage V of the thermocouple 22
a reaches the predetermined first reference voltage V1 in about 10 seconds. Therefore, in the operation control unit 31 of this embodiment, if the output voltage Va of the thermocouple 22 reaches the first reference voltage Va within the reference time T (for example, 20 seconds) as a result of the determination by the output change detection unit 31a, In this case, the duration Ta of the initial operation control is set to 30 seconds, and if the first reference voltage V1 is not reached even after the reference time T is exceeded, the duration Ta of the initial operation control is set to 60 seconds. During the respective durations set as the initial operation control, the burner 10 is burned with a large heating amount at level 8, and when each duration Ta has elapsed, the temperature regulation control operation is started by the temperature regulation control unit 32, which will be described later. Transition.

Furthermore, after the initial operation control is completed, it is determined based on the output voltage Va of the thermocouple 22 whether or not the combustion state of the burner 10 is normal combustion. Here, if the output voltage Va of the thermocouple 22 exceeds the second reference voltage V2, which is different from the first reference voltage V1 for setting the duration Ta of the initial operation control, normal combustion is being performed. If the second reference voltage V2 is not reached, the combustion state is determined to be oxygen-deficient combustion or a misfire state, and extinguishing control is performed.

[0022] In the operation start control, the burner 10 is ignited after a 3-second pre-purge, and in the operation stop control, the burner 10 is extinguished and then a post-purge is performed for about 20 seconds. It is done.

In addition, the operation control unit 31 has various functions such as a cut-off timer for automatically stopping operation after a certain period of time (for example, 60 minutes) and an automatic operation timer for starting operation after a set time. When each operation is instructed by an operation switch (not shown), the corresponding operation is performed.

The temperature control unit 32 determines the heating capacity, which is a reference for determining the combustion amount of the burner 10 and the current value of the convection fan 8, based on the set temperature set by the temperature setting switch 26 and the thermistor 23. It is determined based on the detected indoor temperature.

Here, the set temperature set by the temperature setting switch 26 is "L (corresponding to about 10°C)".
”, “16℃”, “18℃”, ──, “26℃”, “H
(For continuous strong operation)" There are 8 levels in 2°C increments.

On the other hand, the heating capacity to be determined is preset in seven levels, from level 1, which is the weakest heating capacity, to level 7, which has the highest heating capacity as the rated heating amount, as shown in Figure 5. According to the temperature detected by the thermistor 23 with respect to the temperature set by the temperature setting switch 26, the heating capacity is determined from the temperature difference, and especially when "L" or "H" is set as the set temperature, the heating capacity is determined. is determined to be level 7 or level 1, respectively, regardless of the detected indoor temperature.

Furthermore, when the above-mentioned ignition control and initial operation control are performed, the fuel gas supply amount is increased by a predetermined amount (for example, 1
5%) is determined, and the initial operation control is such that the output voltage Va of the thermocouple 22 reaches the first reference voltage V within the reference time T.
The process is performed for a duration Ta set depending on whether or not it exceeds 1.

In addition, the temperature control section 32 is equipped with a save operation switch (not shown) in order to prevent excessive heating according to the user's wishes, and if the save operation switch is operated during operation, A save operation lamp (not shown) is turned on and the target temperature is lowered by 1° C. each time, for example, 30 minutes elapse after the temperature detected by the thermistor 23 reaches the set temperature.

The governor proportional valve 17 and the convection fan 8 are
The drive is controlled according to the heating capacity determined by the above control.

The louver control unit 33 is a functional unit for driving and controlling the gad motor 9a provided in the louver 9. Each time the gad motor 9a, which is rotationally driven in one direction, is driven for a certain unit time, the louver 9 rotates as shown in the figure. The state changes in the order of open → half-open → closed → half-open → open → half-open → --- by the crank mechanism, and the operation control section 31 and temperature control section 32
Predetermined control is performed corresponding to the control state of.

The operation of the gas hot air heater 1 of this embodiment having the above configuration will be explained with reference to FIG. 6. When operation is started by operating the operation switch 24, heating capacity level 8 is determined and ignition control is performed (step 1).
, burner 10 based on the output voltage of thermocouple 22.
When ignition is detected, initial operation control is subsequently started (step 2). When the temperature of the burner 10 gradually rises and the reference time T has elapsed (YES in step 3), if the output voltage Va of the thermocouple 22 exceeds the first reference voltage V1 (YES in step 4), The duration Ta of the initial operation control is set to 30 seconds (step 5), and conversely, if the output voltage Va of the thermocouple 22 does not exceed the first reference voltage V1 (NO in step 4), the initial operation control is performed. Duration time Ta
is set to 60 seconds (step 6). When the respective set duration time Ta has elapsed (Y in step 7)
ES), the initial operation control is completed (step 8), and the operation shifts to 0 temperature control control (step 9). As a result, if the operation is restarted immediately after being stopped once, the temperature of the burner 10 and the temperature of the thermocouple 22 are high to some extent, and the output voltage Va of the thermocouple 22 is higher than the reference time. The first reference voltage V is immediately increased within T.
Since the value exceeds 1, the duration Ta of the initial operation control using the large heating amount becomes short. Therefore, there is no overshoot in which the room is heated more than necessary, and the room temperature does not become too high as a result, and the room temperature can be quickly stabilized.

On the other hand, operation is started when the gas hot air heater 1 is completely cold, and the first reference voltage V1 is increased within the reference time T.
If the initial operation control duration Ta does not exceed 6
Since the burner 10 burns with a large amount of heat during this time, the combustion state of the burner 10 can be reliably stabilized.

Furthermore, when the same control device 30 is used for devices that use different gas types, the temperature rise characteristics of the burner 10 differ depending on the gas type, as shown in FIG. Although the time required for the output voltage of the couple 22 to rise is different, according to the present invention, the duration of the initial operation control is automatically set depending on how the output voltage of the thermocouple 22 increases. Since there is no need to set the time for each gas type,
The combustion state of the burner 10 can be reliably stabilized,
It can be used without any problems.

In this embodiment, a gas hot air heater equipped with a convection fan serving as a blower is shown as the heater, but the fan is not necessarily necessary, and the fuel is not limited to gas, but oil, etc. Other fuels may be used, and the heating source may be an electric heater.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the functional configuration of a control device for a gas hot air heater according to the present embodiment.

FIG. 2 is a perspective view from the front of the gas hot air heater of this embodiment.

FIG. 3 is a perspective view from the rear of the gas hot air heater of this embodiment.

FIG. 4 is a configuration diagram showing a schematic configuration of the gas hot air heater of this embodiment.

FIG. 5 is a characteristic diagram of the heating capacity determined by the temperature control section of the present embodiment.

FIG. 6 is a flowchart for explaining the operation of this embodiment.

FIG. 7 is a time chart showing the output voltage of a thermocouple for explaining the operation of the gas hot air heater of this embodiment.

[Explanation of symbols]

1 Gas hot air heater (heating machine) 10 Burner (heating source) 22 Thermocouple (temperature detection means) 23 Thermistor (room temperature detection means)

Claims (1)

[Claims] [Claim 1] Comprising a room temperature detection means for detecting the indoor temperature and a temperature setting means for setting a target temperature,
It has a temperature control function that controls the heating amount of the heating source based on the temperature detected by the room temperature detection means and the target temperature by the temperature setting means, and the temperature control function and In a heating machine that performs an initial operation in which the heating amount of the heating source is set to a large heating amount regardless of the temperature, the heater is provided with a temperature detecting means for detecting the temperature of the heating source, and the operating time of the initial operation is set to a large heating amount. A heating machine characterized by determining the temperature based on detected temperature.