JPH0641082Y2 - Safety device for hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a safety device for a hot air heater.

(Prior art) When an obstacle is placed or blocked in front of the hot air outlet of a warm air heater, the flow of warm air is obstructed, and hot air is re-sucked into the warm air heater or backflows. The inside of the heater may be overheated. Therefore, a temperature detection element is provided at a position where the temperature changes when the flow of hot air is obstructed, and it is detected by the temperature detection element that the flow of hot air is obstructed, and the operation of the warm air heater is thereby detected. It is known that the device is stopped (for example, Japanese Utility Model Publication No. 48-42106, Japanese Utility Model Publication No. 54-35956).
See Japanese Utility Model Publication No. Sho 55-28841).

On the other hand, as the warm air heater, in addition to the continuous operation mode, one having a timer operation mode so as to operate for a predetermined time is also known.

(Problems to be solved by the invention) It is desirable to provide a temperature detecting element also in a warm air heater having a continuous operation mode and a timer operation mode. However, when operating in the timer operation mode, It is often impossible to monitor when you are away from you, sleeping, etc. Therefore, if you set the operation level of the safety device that stops the warm air heater to the safe side corresponding to the above environment, it will operate in continuous operation mode. When this happens, the safety device operates just by a person sitting in front of the warm air heater, which causes an inconvenience that the warm air heater is cut off earlier than necessary.

(Means for Solving the Problem) The present invention is intended to solve the above-mentioned inconvenience,
Equipped with a timer that automatically stops the operation after a predetermined time has passed,
A hot air heater attached to a hot air heater capable of selecting two operation modes, a continuous operation mode when the timer is not operating and a timer operation mode when the timer is operating, has a flow of hot air blown from the warm air heater. In a safety device that automatically stops the operation of the warm air heater when the signal from the temperature detection element provided at a position where the temperature changes due to the inhibition exceeds a predetermined operation level, the operation level is continuously operated. The operation mode is different from the timer operation mode, and the operation level in the timer operation mode is lower than the operation level in the continuous operation mode.

(Operation) The present invention has the above-described configuration. According to the present invention, in the timer operation mode which is generally used when monitoring cannot be performed, such as when the air-conditioner is far from the warm air heater or when sleeping, the safety device Since the operating level was set lower than the operating level of the safety device in continuous operation mode, which is generally used when there is a hot air heater near the hot air heater or when it is awake and the monitoring is delayed, for example, the obstacle before the hot air heater is When there is an object or body, the warm air heater can be stopped earlier when operating in the timer operation mode than when operating in the continuous operation mode.

(Example) Next, the Example of this invention is described based on drawing.

In the drawings, reference numeral 1 denotes an air conditioner having a cooler 2 in the upper part and a warm air heater 3 in the lower part, and the warm air heater 3 serves as a heat source for indoor air sucked from a suction port 4 in the upper front part. It is a lower blow-out type that is heated by a burner unit 5 and is circulated by a blower 6 from a warm air outlet 7 in the lower front part into the room. The burner unit 5 is controlled to a set temperature by a sensor (not shown). Configured to be.

Reference numeral 8 denotes a temperature detecting element provided inside the warm air heater 3 below the suction port 4, and the temperature detecting element 8 is usually affected by the warm air blown out from the warm air outlet 7. However, if there is an obstacle X or a body in front of the warm air heater 3, the temperature rise due to hitting the obstacle X or the body and returning to the warm air heater 3 side as indicated by the dotted line is detected. .

2 and 4 show a system diagram and a control block diagram of an embodiment of the present invention.

A solenoid valve 11 is provided in a gas supply passage 10 to the gas burner 9 of the burner section 5, and the solenoid valve 11 is controlled to be opened and closed by a control device 12 having a built-in microcomputer for inputting a signal from the temperature detection element 8. It

The control device 12 has a safety device 14 with a timer 13 for automatically stopping the operation of the warm air heater 3.

The present invention provides a hot air heater having such a structure with a switch A for switching between a timer operation mode in which the heater is operated for a predetermined time and a normal continuous operation mode, and the safety device 14 interlocked with the switch A. The operating level of at least the two operating modes of the continuous operating mode and the timer operating mode, and the operating level of the timer operating mode is lower than the operating level of the continuous operating mode, The operating level is specifically determined by the software of the microcomputer.
As shown in the figure, the timer operation mode is when the signal from the temperature detection element 8 continues at 45 ℃ or higher for 20 seconds or at 38 ℃.
When the above is continued for 3 minutes, the safety device 14 activates the solenoid valve 11
Is closed so that the operation of the warm air heater 3 is stopped, and in the continuous operation mode, the signal from the temperature detecting element 8 is
The safety device 14 closes the solenoid valve 11 to stop the operation of the warm air heater 3 when the temperature is kept at 65 ° C. or higher for 5 seconds.

Thus, when there is an obstacle or body in front of the warm air heater, the warm air heater 3 can be stopped earlier in the timer operation mode than in the continuous operation mode.

Although both the temperature and the time are changed as the operation level in the above-mentioned embodiment, either one may be changed. For example, when the operation level is changed only by the temperature, as shown in FIG. Any circuit configuration may be used. still,
In the case of this figure, a thermistor having a negative characteristic that the resistance value decreases as the temperature rises is used as the temperature detection element 8, and the resistance value of the resistor R1 used in the continuous operation mode is the resistance used in the timer operation mode. It was set smaller than the resistance value of R2.

(Effect of the Invention) As described above, according to the present invention, the operation level of the safety device that automatically stops the operation of the warm air heater is set to be lower in the timer operation mode than in the continuous operation mode. In the timer operation mode used when the hot air heater cannot be monitored, for example, people, especially children, do not get burned even if they fall asleep in front of the hot air outlet, and the laundry is warm air heated. Even if it falls on the machine and the suction port or the hot air outlet is closed, the laundry is not heated and the temperature in the main body of the warm air heater does not rise abnormally to deteriorate the warm air heater.

Of course, in the continuous operation mode, which is used when monitoring is complete, the safety level is higher than the timer operation mode. It won't wake up.

Therefore, there is an effect that the safety is improved and an appropriate operation control according to the operation mode can be performed as compared with the case where the both operation modes have the same operation level.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing an embodiment of the present invention, FIG. 2 is a system diagram thereof, FIG. 3 is a flow chart for explaining its operation, and FIG. 4 is a block diagram of an embodiment of the present invention. FIG. 5 is a circuit diagram of another embodiment of the present invention. 3 ... Warm air heater 8 ... Temperature detection element 13 ... Timer 14 ... Safety device

Claims (1)

[Scope of utility model registration request] 1. A hot-air heater including a timer for automatically stopping operation after a predetermined time has elapsed, and capable of selecting two operation modes, a continuous operation mode when the timer is not operating and a timer operation mode when the timer is operating. If the signal from the temperature detecting element installed in the position where the temperature changes due to the obstruction of the flow of warm air blown out from the warm air heater exceeds a predetermined operating level, the warm air heater In the safety device for automatically stopping the operation, the operating level is made different between the continuous operating mode and the timer operating mode, and the operating level in the timer operating mode is made lower than the operating level in the continuous operating mode. Safety device for hot air heaters.