JPH0674928B2 - Hot air heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a safety device for a hot air heater.

2. Description of the Related Art In the conventional warm air heater, when a shield is placed in front of the warm air outlet, no special safety device is provided. Hereinafter, description will be given with reference to the drawings.

FIG. 6 shows a state in which a shield is placed in front of the warm air outlet while the conventional warm air heater is operating. The air taken in through the intake port 9 by the rotation of the blower fan 3 exchanges heat with the heat exchanger 2 which is heated by the combustion heat of the burner 1, becomes warm air, and is discharged as a blown air stream 8 from the warm air outlet 7. To be done. Reference numeral 4 is a room temperature detecting element, 5 is a main body of a warm air heater forming an outer case, and 6 is an overheat preventing temperature detecting element which operates when the appliance abnormally overheats to stop the operation of the appliance.

Now, when the shield P shown in the figure is in front of the hot air outlet 7 of the device, the flow of the blown airflow 8 collides with the shield 9, is dispersed vertically and horizontally, is diffused, and is then again sucked. The air flow becomes 10 and returns to the intake port 9, and the indoor temperature distribution only deteriorates, and the operation of the appliance continues without any trouble.
When the shield P completely closes the hot air outlet, the air for heat exchange does not flow inside the device, so when the heat exchanger 2 overheats and the temperature rises to the safety limit, the overheat prevention temperature detection element 6 Works to stop the operation of the equipment,
Safety is secured.

Problems to be Solved by the Invention However, with the above configuration, when the infant, the elderly, or the sick person is laid close to the warm air outlet 7 or when the infant is rolled over and approached, Since the air outlet 7 is not completely shielded and there is a considerable amount of airflow 8, the operation of the equipment can continue without hindrance, resulting in long-term exposure to high-temperature low-humidity hot air and low-temperature burns. There was a problem that dehydration and even the risk of fatal accidents.

In view of the above problems, the present invention provides a warm air heater configured to stop the operation of the appliance when a person with inconvenient body movement approaches the warm air outlet.

Means for Solving the Problems In order to solve the above problems, the warm air heater of the present invention can be installed in front of the hot air outlet and a thin plate-like mat whose exterior is an electrical insulator can be installed flat on the floor. In the inside of the mat, a plurality of temperature sensing elements that are positioned to weakly heat-transfer and a heating element that generates heat from a heat source other than the main body of the warm air heater are arranged to detect multiple temperatures. The element is connected to the control circuit of the warm air heater so as to send an abnormal temperature signal of the heating element.

Operation The present invention has the above-described configuration, and when a person with a physical disability is positioned over almost the entire area of the mat in front of the hot air outlet, or if futons, furniture, etc. are placed, the heat of the heating element in the mat is The temperature inside the mat rises as the heat dissipation to the inside of the room is cut off, and the temperature detection element placed in the weak heat coupling detects heat generation and sends an abnormal signal to the control circuit, stopping the operation of the equipment. It works as if to do.

Embodiment A safety device according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the above-mentioned conventional technique are designated by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described. 1 (a) and 1 (b) show the invention 1
1 shows an overall configuration of a warm air heater according to an embodiment. 11
Is formed as a thin sheet with an electric insulator as an exterior with a mat, and accommodates a heating element 13 having a temperature detecting element 12 coupled so that weak heat is transmitted to the inside of the warm air heater main body 5. It is arranged on the floor in front of the air outlet 7. The temperature detecting element of the mat 11 is connected to the controller 14 of the warm air heater main body 5. 2 and 3 show the operation system of the warm air heater and the whole apparatus of the above embodiment. FIGS. 4 and 5 show changes in voltage on the electric circuit when the warm air heater of the present invention detects before and after detecting the shield on the mat 11.

The operation will be described below with reference to FIGS.

When the ignition operation is performed, the cock 15 is opened and the control device 14 opens the original solenoid valve 16 so that the gas flows from the governor 17 to the burner 1 via the bypass passage 19 and at the same time, a high pressure continuous spark is generated from the ignition plug 20 to the burner 1. Ignite. When ignited, the ion current flowing through the frame rod 21 and the burner 1 is detected, the high pressure spark is stopped, the blower fan 3 is rotated, and thereafter, the room temperature detecting element 4 and the control device 14 are used to maintain an electromagnetic field to maintain a predetermined room temperature. Continue the strong-weak combustion by turning ON / OFF the valve 18 and the strong-weak-OFF operation by turning ON / OFF the original solenoid valve 16. On the other hand, the heating element 13 starts to generate heat by the current from the power source 23, but since the convection of the blown air flow 8 flows on the upper surface of the mat 11, the heat radiation to the room is great and the temperature detecting element 12 does not generate any heat. Not affected by body 13 heat. In this case, the value of resistor 24 R1
The voltage V _T determined by the ratio of the resistance value of the temperature sensing element 13 to the resistance value
Since the voltage V _REF determined by the ratio of the value R2 of 25 and the value R3 of the resistor 26 is sufficiently large, the comparator 28 has an output H1. Temporarily approach the warm air heater body 5 by changing the set temperature, etc.
When the object is stepped on and a shield is placed on a part of the plurality of temperature detecting elements 12, the voltage V _T is shown in FIG.
Due to the relationship between V _T-2 and V _REF , the comparator 28 maintains the output H1.

Now, when a person with a disability sleeps or a futon or a blanket is placed on almost the entire surface of the mat 11, the heat generated by the heating element 13 stops being dissipated into the room and the temperature inside the mat 11 rises. Then, the temperature detecting element 12 is affected by heat and its resistance value changes, and the comparator 28 is inverted to the output Lo in the relationship of V _T-3 and V _REF shown in FIG. As a result, the control device 14 works to turn off the original solenoid valve 16 and stop the operation of the instrument.

As described above, according to the present invention, a mat in which a heating element that generates heat by a heat source other than the main body of the warm air heater and a temperature remote element that detects a temperature rise of the heating element are installed is used as the temperature of the heating heater body. Arranged on the floor in front of the air outlet and connecting the temperature detection element to the controller of the warm air heater body, and sending a signal to the controller when the temperature of the heating element rises to stop the operation of the warm air heater body Therefore, when an infant, an elderly person, or a sick person sleeps in front of the hot air outlet and is exposed to high temperature air, an abnormality is detected and the operation of the device is stopped, and low temperature burns, dehydration symptoms or death accidents may occur. It is possible to provide a safe device that is prevented in advance.

[Brief description of drawings]

FIG. 1 (a) is a vertical cross-sectional view of the whole warm air heater according to an embodiment of the present invention, FIG. 1 (b) is a plan view of the mat, and FIG. 2 is a block diagram showing its operating system. Figure 3 shows
An electropneumatic circuit diagram of one embodiment of the present invention, FIGS. 4 and 5 are graphs showing the operation in the electric circuit, and FIG. 6 is a vertical sectional view showing the whole of the conventional hot air heater. 5 ... Warm air heater body, 7 ... Warm air outlet, 11 ... Mat, 12 ... Temperature detecting element, 13 ... Heating element, 14 ... Control device.

Claims (1)

[Claims] 1. A warm air heater main body having a hot air outlet on the front surface and provided with a control device for stopping the operation in response to a temperature abnormality signal, and a front surface of the warm air heater main body on the floor surface. Installed and internally provided with a heating element that generates heat from a heat source other than the main body of the warm air heater, and a mat having a temperature detection element that detects the temperature of the heated portion heated by this heating element, and the temperature detection of this mat The element is a warm air heater electrically connected to the control device.