JPH0590256U - Hot air heater - Google Patents

Abstract

(57) [Summary] [Purpose] In a warm air heater equipped with a combustor and a convection blower, the blower blows air even after the combustor is extinguished This reduces the discomfort caused by and prevents the life of the components from being shortened due to an abnormally high temperature inside the main body. [Structure] A temperature sensor 17 is provided inside the main body 11 of the warm air heater 20, and when the blower 13 is temporarily stopped when the combustor 12 is extinguished, the internal temperature of the main body 11 exceeds a predetermined first set temperature. Blowers are sometimes started with a blower amount smaller than the blown amount during combustion, and the blower 13 is stopped when the temperature inside the main body 11 drops to a predetermined second set temperature lower than the first set temperature.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot-air heater including a combustor such as an oil fan heater and a convection blower, and the blower blows air even after the combustor is extinguished.

[0002]

[Prior Art]

 FIG. 5 shows a conventional general hot-air heater (10). This warm air heater (10) is equipped with a burner (combustor) (12) in the lower central portion inside the main body (11) of the warm air heater, and a convection blower (13) at the rear of the main body (11). Is equipped with. Reference numeral (14) is a top plate inside the main body (11), (15) is a side plate inside the main body (11), and (16) is a blower port formed on the front surface of the main body (11). The air that has become hot due to the combustion of fuel in the burner (12) inside the main body (1 1) is blown out from the blower port (16) toward the front of the main body (11) by the blower (13) so that the room is warmed. Has become. During combustion of the burner (12), not only the air inside the main body (11), but also the side plate (15) and top plate (14) that form the air passage, and around the blower port (16) are hot. However, the blower (13) blows out the hot air inside the main body (11) toward the front of the main body (11), and at the same time, the side plate (15) which is a component of the warm air heater (10). By applying air to the high temperature parts such as the top plate (14) and the ventilation port (16) to cool them, these components are prevented from becoming too high in temperature.

In such a conventional hot air heater, as shown in FIG. 6, in order to cool the components that have become hot even after the burner (12) is extinguished (combustion stopped), The blower (13) is operated for a certain period of time so that the same amount of air is blown, and then the blower (13) is stopped.

[0004]

[Problems to be solved by the device]

 In the conventional hot air heater as described above, even after the burner is extinguished, the same amount of air is blown as it is during combustion for a certain period of time, so cold air comes out from the air outlet and the amount of air is large. There was a problem of making people in front of the wind heater uncomfortable.

On the other hand, if the operation of the blower is stopped at the same time as the burner is extinguished, there is a problem that the inside of the main body becomes abnormally hot and the life of the components is shortened.

The object of the present invention is to solve the above problems, reduce the discomfort caused by cold air after extinguishing the combustor, and prevent the life of the components from being lowered due to an abnormally high temperature inside the main body. It is to provide a hot air heater that can.

[0007]

[Means for Solving the Problems]

 The hot-air heater according to the present invention comprises a combustor and a convection blower, and the blower blows air even after the combustor is extinguished. When the internal temperature of the main body reaches or exceeds the preset first preset temperature, air is blown at a lower air flow rate than the air volume during combustion, and the internal temperature of the main body is set to the above first set temperature. The blower is stopped when the temperature drops to a predetermined second set temperature lower than the temperature.

[0008]

[Action]

 After temporarily stopping the blower when the combustor is extinguished, when the temperature inside the main unit rises above the specified first set temperature, air blowing is started with a blower amount less than the maximum blown amount, and the temperature inside the main unit changes. Since the blower is stopped when the temperature drops to the second preset temperature lower than the first preset temperature, discomfort caused by cold air is reduced and the inside of the main body is cooled.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a warm air heater (20). An appropriate temperature sensor (17) is provided on the top plate (14) inside the main body (11) of this heater (20), and the output of this temperature sensor (17) is output after the burner (12) is extinguished. Based on this, the operation of the blower (13) is controlled. Others are the same as in the conventional example of FIG. 5, and the same parts are denoted by the same reference numerals.

The flowchart of FIG. 2 shows an example of control of the blower (13) after extinguishing the burner (12).

In FIG. 2, when the burner (12) is extinguished, first, the operation of the blower (13) is stopped (step 1), and the temperature of the top plate (14) is detected from the output of the temperature sensor (17). It is checked whether or not is equal to or higher than the preset first set temperature A (step 2). The first set temperature A is, for example, about 80 ° C. Then, steps 1 and 2 are repeated until the temperature becomes equal to or higher than the first set temperature A, and the ventilation stop state is continued. When the temperature becomes equal to or higher than the first set temperature A in step 2, the operation proceeds to step 3 to start the operation of the blower (13) to start air blowing with a smaller air volume (small air blowing) than during combustion, and the temperature is set in advance. It is checked whether the temperature is equal to or lower than the second set temperature B (step 4). The second set temperature B is lower than the first set temperature A, and is about 40 ° C., for example. Then, steps 3 and 4 are repeated until the temperature becomes equal to or lower than the second set temperature B, and the small amount of air is continued. When the temperature becomes equal to or lower than the second set temperature B in step 4, the process proceeds to step 5, the blower (13) is stopped, and the process ends.

FIG. 3 shows changes in the operating condition and the air flow rate of the blower (13) when the above-described control is performed. The temperature of the top plate (14) and the blower port (16) of the main body (11) is shown in FIG. The changes are shown in Figure 4. As is apparent from FIG. 4, the temperature of the top plate (14) during combustion of the burner (12) is lower than the first set temperature A. When the burner (12) is extinguished and the air blow is stopped, high temperature air is not sent, so the temperature of the air blower port (16) decreases, but the temperature of the top plate (14) part rises. However, until this temperature becomes equal to or higher than the first set temperature A, the blower (13) remains stopped and the blower is not performed. When the temperature of the top plate (14) becomes equal to or higher than the first preset temperature A, the blower (13) is started to blow air. As is clear from FIG. 3, the air flow rate at this time is smaller than the air flow rate during combustion. Due to such a small amount of air blown, the temperature of the top plate (14) gradually decreases and does not exhibit an abnormally high temperature. When a small amount of air is started, the temperature of the air outlet (16) rises once, but then gradually decreases. Then, when the temperature of the top plate (14) becomes equal to or lower than the second set temperature B, the blower (13) is stopped and the air blow is stopped.

By performing such control, as is apparent from FIG. 4, the temperature of the air blown from the blower port (16) becomes about 70 to 40 ° C., and the blown air amount is that during combustion. Less, so there is no discomfort.

For reference, when the same amount of air is blown for a certain period of time even after the burner is extinguished as in the conventional case, the top plate (14) inside the main body (11) and the air outlet (16) are The temperature change is shown in FIG. In this case, even after the combustion is stopped, the same amount of air as that during combustion is blown, so the temperature of the air blown out from the blower port (16) is about 70 to 20 ° C, and since the amount of air is large, the cold air causes discomfort. feel.

FIG. 8 shows changes in temperature of the top plate (14) and the blower port (16) inside the main body (11) when the ventilation is stopped at the same time as the combustion is stopped. If the blast is stopped at the same time as the combustion is stopped, high temperature air will not be sent, so the temperature of the blower port (16) will decrease, but the temperature of the top plate (14) will rise and exceed 100 ° C. It gets very hot.

[0017]

[Effect of the device]

 According to the warm air heater of the present invention, as described above, it is possible to reduce the discomfort caused by the cold air after the combustion is stopped, and it is also possible to cool the inside of the main body, so that the inside of the main body becomes abnormally hot. It is possible to prevent the life of the component parts from being shortened as a result.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a warm air heater showing an embodiment of the present invention.

FIG. 2 is a flow chart showing an example of blower control by the warm air heater of FIG.

FIG. 3 is a graph showing an example of changes in the amount of air blown by the blower control of FIG.

FIG. 4 is a graph showing a temperature change in a portion of a top plate inside a main body of a warm air heater and a vicinity of a blower opening in the case of controlling the blower in FIG.

FIG. 5 is a schematic vertical cross-sectional view of a conventional warm air heater.

FIG. 6 is a graph showing an example of changes in the amount of air blown by the blower control in the warm air heater of FIG.

FIG. 7 is a graph showing a temperature change in a portion of a top plate inside a main body of a warm air heater and a vicinity of a blower opening in the case of controlling the blower in FIG. 6.

FIG. 8 is a graph showing a temperature change in a portion of a top plate inside a main body of a warm air heater and a vicinity of a blower port when air blowing is stopped at the same time when combustion is stopped.

[Explanation of symbols]

 (11) Hot air heater body (12) Burner (combustor) (13) Blower (17) Temperature sensor (20) Hot air heater

Claims (1)

[Scope of utility model registration request] 1. A warm-air heater provided with a combustor and a convection blower, wherein the blower blows air even after the combustor is extinguished, and the blower is temporarily stopped when the combustor is extinguished. After that, when the temperature inside the main body becomes equal to or higher than the predetermined first set temperature, air blowing is started with an air flow rate smaller than the air flow rate at the time of combustion, and the temperature inside the main body is lower than the first set temperature. A warm air heater characterized in that the blower is stopped when the temperature drops to a set temperature.