JPH04263741A - Hot-air heater - Google Patents

Abstract

PURPOSE:To obtain a hot-air heater which prevents burns due to an abnormal approach to a hot-air diffuser. CONSTITUTION:An abnormal approach detecting element 9 which changes an output corresponding to a change in a person's movement is arranged in a front part of a hot-air heater body 1 and an output from the detecting element 9 is inputted into a comparison circuit 11. If an input exceeds a prescribed value, an input is given to a control circuit 12 as an abnormal approach detection signal Sh, according to which burning of a burner 14 is stopped or turned over to a week burning. By this, even if an old man or child who cannot act quickly approaches carelessly a hot-air diffuser too closely, he can be protected from getting burned. Thus safety can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air heater which controls combustion by detecting abnormal approach of a person to the main body of the hot air heater.

0002

[Prior Art] Traditionally, hot air heaters have been provided with temperature detection means that detects a temperature rise at the hot air outlet when an object covers the main body of the heater, and the output of this temperature detection means is The combustion equipment will be stopped based on this. That is, when the temperature detection means detects that the temperature at the hot air outlet has increased abnormally, the heating operation is stopped.

0003

[Problem to be Solved by the Invention] However, in the above-mentioned system, when a person stands in front of the hot air outlet, the temperature detection means does not work because the hot air outlet is not completely blocked. However, the heating operation continues as is. For this reason, if the person standing in front of the hot air outlet is, for example, an elderly person or a young child who cannot move quickly, they may suffer burns because they are unable to take immediate action even if they sense danger. There was a risk.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide a highly safe system that eliminates the risk of injury such as burns even when an elderly person or a small child approaches the main body of a hot-air heater. Our goal is to provide hot air heaters.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the first invention provides a hot air heater body equipped with a combustion device for burning fuel such as gas or oil, in which a person An abnormal approach detection means is provided for outputting an abnormal approach detection signal when an abnormal approach is detected, and a control circuit is provided for forcibly stopping combustion of the combustion device when the abnormal approach detection signal is output. . In a second aspect of the invention, the control circuit automatically restarts combustion in the combustion device when the abnormal approach detection signal from the abnormal approach detection means stops.

[0006]

[Operation] In the hot air heater of the present invention, the first invention forcibly stops the combustion of the combustion device based on the output from the abnormal approach detection means, and the second invention further stops the combustion of the combustion device. Since it restarts automatically, even if an infant or elderly person who is unable to move quickly approaches the hot air heater, there is no risk of injury such as burns, improving safety, and making it easier to restart operation. Since no special operation is required, there is no troublesome operation.

[0007]

[Example] Example 1. An embodiment of the present invention will be described below. In FIG. 2, reference numeral 1 denotes a hot air heater body such as a kerosene fan heater, which is located slightly below the center of the front case 2 of the main body and has a hot air outlet 3 and an operation switch 5 on the front side of the main body case 4. It also has a combustion device (indicated by reference numeral 14 in FIG. 1) inside, and a blower (inside the room) that discharges combustion heat from the combustion device to the outside (indoors) from the hot air outlet 3. (not shown). Reference numeral 7 denotes a see-through window for an abnormal approach detection element provided at the lower part of the hot air outlet 3 of the main body front case 2.

Next, in FIG. 1, reference numeral 8 denotes an abnormal approach detection means, which includes an abnormal approach detection element 9 disposed on the back side of the see-through window 7 for detecting abnormal approach, and the output of this detection element 9. It is configured to include an amplification circuit 10 for amplification and a comparison circuit 11. The abnormal approach detection element 9 is composed of a pyroelectric infrared detection element whose output changes depending on the movement of the person, and its output S (output amplified by the amplifier circuit 10) is, for example, as shown in FIG. If there is not much change in the movement of the person, the level will be around the steady level L, but if there is a change in the movement of the person, the level will change from the above level L in a positive direction or a negative direction. The above change in the positive direction is seen when a person approaches the heater main body 1, and the change in the negative direction is seen when the person moves away from the heater main body 1.

Furthermore, the comparator circuit 11 has an upper reference value La for detecting abnormal approach of a person and a lower reference value Lb for detecting cancellation of abnormal approach of a person by a Schmitt trigger function. , outputs an abnormal approach detection signal Sh when the output S exceeds the upper reference value La, and stops outputting the abnormal approach detection signal Sh when the output S falls below the lower reference value Lb.

Reference numeral 12 denotes a control circuit composed of, for example, a microcomputer, which controls the operation switch 5.
When the operation command signal Ss is input by turning on the operation command signal Ss, the combustion device 14 is caused to burn through the drive circuit 13, and the operation command signal Ss is inputted.
When the input of s disappears, the combustion device 14 stops combustion. Furthermore, when the abnormal approach detection signal Sh is input, the combustion device 14 is forcibly held in a stopped state regardless of whether or not the operation command signal Ss is input.

Next, the operation of the above structure will be described. When the operation switch 5 is turned on, the operation command signal Ss is inputted to the control circuit 12, the drive circuit 13 is operated, and the combustion device 14 is activated.
is combusted, warm air is blown out from the hot air outlet 3 by the rotation of the blower, and heating operation is performed. Now, when a person abnormally approaches in front of the hot air heater main body 1, as shown at point A in FIG.
changes greatly in the positive direction and exceeds the upper reference value La of the comparison circuit 11, so the comparison circuit 11 of the abnormal approach detection means 8
An abnormal approach detection signal Sh is outputted from the control circuit 12 and given to the control circuit 12. The control circuit 12 receives this abnormal approach detection signal Sh.
Based on the input, combustion in the combustion device 14 is stopped as shown in FIG. When the person moves away from the hot air heater main body 1, the output S changes greatly in the negative direction as shown at point B in FIG. 3 and falls below the lower reference value Lb of the comparison circuit 11, causing an abnormality. The output of the approach detection signal Sh is stopped. As a result, the control circuit 12 automatically restarts combustion in the combustion device 14. When a person approaches the person abnormally, the heating operation is forcibly stopped by the abnormal approach detection means 8, and when the person moves away, the heating operation is automatically resumed. Therefore, even if an infant or an elderly person who cannot act as expected suddenly approaches the device, there is no risk of burns or the like, and safety is further improved. Further, since there is no need for any re-operation to resume operation, there is no troublesome operation.

Example 2. FIG. 4 shows another embodiment in which the control circuit 2 is configured so that combustion in the combustion device 14 is restarted after a certain period of time t has passed from the time when the output of the abnormal approach detection signal Sh is stopped. Compared to the configuration in which the combustion of the combustion device 14 is restarted immediately from the point in time when the output of the abnormal approach detection signal Sh is stopped (point B in FIG. 3) of the first embodiment shown in FIG. This further eliminates the risk of exposure.

In the above embodiment, the control circuit 12 forcibly stops combustion in the combustion device 14 when the abnormal approach detection signal Sh is output.
The same effect can be obtained by forcibly switching the combustion amount to weak combustion. In addition, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the gist.

[0014]

Effects of the Invention As described above, the present invention provides an abnormal approach detection signal that outputs an abnormal approach detection signal when a person approaches the main body of a hot air heater equipped with a combustion device that uses gas, oil, etc. as fuel. In addition to providing a detection means, a control circuit for forcibly stopping the combustion of the combustion device or switching to weak combustion when the abnormal approach detection signal is output is provided. If the aircraft gets too close to the main body, combustion is forcibly stopped or switched to a weak combustion state, so even if elderly people or young children who are unable to move quickly come too close, there is no need to worry about getting burnt, etc., making it safer. It produces excellent effects with extremely high performance.

Further, according to the present invention, when the output of the abnormal approach detection signal stops, the combustion of the combustion device is automatically restarted and the heating operation is resumed, so there is no need for re-operation and there is no need for troublesome operation. do not have.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electrical configuration showing one embodiment of the present invention.

FIG. 2 is a perspective view of a hot air heater showing an embodiment of the present invention.

FIG. 3 is a diagram of a signal output mode and a combustion device operation mode showing an embodiment of the present invention.

FIG. 4 is a diagram of a signal output mode and a combustion device operation mode showing another embodiment of the present invention.

[Explanation of symbols]

1　Hot air heater body 8 Abnormal approach detection means 9 Abnormal approach detection element 10 Amplifier circuit 11 Comparison circuit 12 Control circuit 14 Combustion device

Claims (2)

[Claims] Claim 1: A warm air heater body equipped with a combustion device for burning fuel such as gas or oil is provided with abnormal approach detection means for outputting an abnormal approach detection signal when a person approaches abnormally, and A hot-air heater characterized in that a control circuit is provided for forcibly stopping combustion in the combustion device when the abnormal approach detection signal is output. 2. The hot air heater according to claim 1, wherein the control circuit automatically restarts combustion in the combustion device when the abnormal approach detection signal stops.