JPH01146592A - Steam iron - Google Patents

Abstract

PURPOSE: To suppress temperature rising of a base surface in rear of a base by allowing a controlling circuit to detect the energizing rate of a heater to control the discharging quantity of the electric pump. CONSTITUTION: When water is discharged from the electric pump 7 and an evaporating room 3 is cooled, a temperature detecting element 11 senses this to start energizing the heater 2. After energizing in a period of T1 from this time, the heater is turned OFF during T2 . After then energizing is executed again in a period of T3 . A temperature is controlled by repeating the above process. In order to detect an energizing rate concerning the period of T0 , a waveform A and a waveform B being a reference pulse are compared with each other by a comparator 15 and its output is inputted to an integration counter 15. Consequently, the energizing rate (T1 +T3 )/T0 is shown by V1 /V0 and according to this output, the current of the pump 7 is managed to control the discharging amount. In the case where a steam amount is made very large by turning the knob of the steam quantity, temperature rising of the base rear part can be prevented by detecting the energizing rate to the heater 2 to control the discharging amount of the pump 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a steam iron for general household use.

Prior Art FIG. 3 shows a steam iron using a conventional electric pump. In the figure, 1 is a base, 2 is a heater, 3 is a vaporization chamber, 4 is a vaporization chamber lid constituting the vaporization chamber 3, and 6
is a tank, 6 is a handle, 7 is an electric pump, 8 is a control device installed in the handle, 9 is a conduit to the vaporization chamber 3 with an electric pump 7 interposed in the middle, 1o is a steam amount for adjusting the steam amount The knob 11 is a temperature sensing element that controls the temperature of the base surface. The operation of the steam iron configured as described above will be described. The electric pump 7 operated by the control device 8 sucks water from the tank 5 and sends the water to the vaporizing chamber 3 through the water conduit 9. This vaporization chamber 3
This generates steam and blows it out of base 1. Further, the amount of steam discharged from the mechanical pump 7 is made variable by a steam amount knob 10.

Problems to be Solved by the Invention However, in the conventional configuration described above, when the steam amount knob 10 is set to the maximum and the amount of discharge from the electric pump 7 is increased, the base near the temperature sensing element 11 is constantly cooled. The disadvantage is that the time during which the heater 2 is energized is very long and the temperature of the base surface becomes very high in the rear part of the base 1 which is away from the vaporizing chamber 3. This is because the rear part of the 6-seat is located far away from the vaporization chamber 3, so there is less cooling due to the heat of vaporization accompanying the generation of steam, and the energization rate of the heater 2 is high.
This is because the rear of the base continues to be heated. Therefore, heat exceeding the temperature suitable for the fibers of the cloth to be ironed is applied, causing damage to the cloth.

The present invention solves the above-mentioned conventional problems, and aims to provide a steam iron that suppresses the rise in temperature of the base surface at the rear of the base, which is remote from the vaporizing chamber, when steam is generated.

Means for Solving the Problems To achieve this object, the steam iron of the present invention is equipped with a control device that detects the energization rate of the heater using a control circuit and controls the discharge amount of the electric pump.

With this configuration, even if the temperature at the rear of the base rises due to steam generation, the detection circuit detects the energization rate to the heater, and if it exceeds a certain standard, the discharge amount of the electric pump is controlled. It is possible to suppress the heating of the heater and control the temperature rise at the rear of the base.

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

In the embodiment of the present invention, a control circuit and an electric pump control circuit shown below are added to the configuration shown in FIG. 3 above, and the explanation of FIG. 3 is used for the overall configuration.

In FIG. 1, the control circuit 12 controls the heater 2's 0N-
It consists of a waveform detection circuit 13 that detects a waveform associated with OFF, and a comparator 16 that compares the waveform detected by this waveform detection circuit 13 with the waveform of a reference pulse generation circuit 14 and outputs the result to an integration counter 16.

The electric pump control circuit 17 is operated based on the output of the integration counter 15.

In FIGS. 1 and 2, when water is discharged from the electric pump 7 and the vaporization chamber 3 is cooled, this is sensed by the temperature detection element 11, and the heater 2 starts to be energized. From this point on, as shown in FIG. 2A, after energizing for a period of T1, T
Turn off the heater for 2 minutes. After that, the power is turned on again for a period of T3.

Temperature control is performed by repeating this process, but in order to detect the energization rate for the current T0 period, the human waveform in Figure 2 and the reference pulse B waveform are compared with the comparator 16, and the output is is input into the integration counter 16. Therefore, the energization rate (T
1+T3)/T0 is expressed as v1/v0, and the discharge amount can be controlled by controlling the control current of the electric pump 7 according to this output. As described above, according to this embodiment, when the steam amount knob is set to the maximum and the steam amount is extremely large, the energization rate to the heater 2 is detected, and the discharge amount of the electric pump 7 is controlled according to this energization rate. This prevents the temperature from rising at the rear of the base.

Effects of the Invention As described above, the present invention detects the energization rate to the heater and controls the discharge amount of the electric pump, thereby preventing an abnormal temperature rise at the rear of the base and eliminating damage to the fabric. This is to prevent parts from deteriorating. In addition, when installing a temperature fuse to prevent excessive temperature rise at the rear of the base, it is possible that the abnormal temperature rise may cause the fuse to melt and cause malfunctions, but by using the present invention, such malfunctions can be prevented. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a waveform diagram, and FIG. 3 is a partially cutaway side view of a steam iron using an electric pump. 1...Base, 2...Heater, 3.
... vaporization chamber, 6 ... tank, 7 ...
...Electric pump, 12... Control circuit. Name of agent: Patent attorney Toshio Nakao and one other person I?
- Control circuit No. 2 port 1 - Base Fig. 3 143 7117

Claims (1)

[Claims] A base that is heated by a heater and has a vaporization chamber; a tank that stores water to be fed to the vaporization chamber; a control circuit that has a circuit that detects the energization rate to the heater; and an electric pump interposed in the middle of a water conduit to the steam iron, and the control circuit detects the energization rate of the heater to control the discharge amount of the electric pump.