JPS6238639Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a steam iron in which the supply of water is stopped unless the base temperature reaches a value suitable for vaporizing water.

Conventional structure and its problems Currently, the mainstream steam iron generation method is the so-called drip type, in which the vaporization chamber and the steam passage are directly connected, and the steam generated in the vaporization chamber is directly guided to the steam outlet on the base surface. . However, with this drip-type steam iron, if water is supplied to the vaporization chamber when the base does not reach the appropriate temperature for water vaporization, the dripped water will not become steam and may erupt from the steam outlet or be used. Water remained in the post-vaporization chamber and sometimes caused corrosion of the vaporization chamber and base.

In order to solve this problem, steam irons as shown in FIGS. 1 and 2 have been developed.

In Figure 1, a base 2 in which a heater 1 is embedded
A vaporizing chamber 3 and a steam ejection hole 4 communicating with the vaporizing chamber 3 are formed in the vaporizing chamber 3. Rubber button 5 is vaporization chamber 3
A nozzle 8 provided on a water tank 7, which is fixed on a base lid 6 that covers the upper part of the main body and is removable from the main body, is connected to the base lid 6 to prevent water in the water tank 7 from flowing out to the outside. There is. 9 is a water supply hole provided in the nozzle 8, and an opening/closing rod 10 moves up and down in conjunction with a steam button 11 to open and close it. Reference numeral 12 denotes a valve device that senses the base temperature and controls the water supply to the vaporization chamber 3. FIG. 2 shows a sectional view of the main parts near this valve device 12. 13 is a ferrite or
A heat sensitive body made of Ni-Cu alloy, Ni-Fe alloy, etc.
A hole 13' is provided and the base lid 6 is thermally attached. A permanent magnet 14 is provided with a valve body 15, and is biased in the valve opening direction (upward) by a spring 16 disposed around the permanent magnet. Reference numeral 17 is a stopper for regulating the position of the permanent magnet 14 when the valve is opened, and reference numeral 18 is a casing that houses the permanent magnet 14 and the spring 16.

In the above configuration, heat is transferred from the base 2 to the heat sensitive body 13 via the base lid 6, and
If the temperature of the heat sensitive body 13 has not reached a value suitable for vaporizing water, the temperature of the heat sensitive body 13 does not reach the Curie point, and since it is a magnetic body, a magnetic attraction force acts between it and the permanent magnet 14, and the permanent magnet 14 The spring 16 is compressed and adsorbed to the heat sensitive body 13, and the valve body 15 is inserted into the hole 1 of the heat sensitive body 13.
Block 3'. In this state, steam button 1
1 to raise the opening/closing rod 10 and create a steam state, water will not be supplied to the vaporization chamber 3. Next, when the base temperature rises sufficiently to a value suitable for vaporization and the temperature of the heat sensitive body 13 exceeds the Curie point, the heat sensitive body 13 loses its magnetism and the magnetic attraction force between it and the permanent magnet 14 acts. permanent magnet 1
4 is pushed upward by the spring 16 and stops when it comes into contact with the stopper 17, opening the hole 13'. In this state, when the steam button 11 is operated to create a steam state, water dripping from the water supply hole 9 is supplied to the vaporization chamber 3 as shown by arrow a, and is turned into steam and ejected from the steam ejection hole 4 communicating with the vaporization chamber 3. be done.

In this way, in the above conventional configuration, the temperature of the base 2 is sensed by the heat sensitive body 13 and the valve body 15 is moved to control the supply of water. Since the heat is transferred to the valve body 13, there is a problem in that the opening/closing temperature of the valve body 15 varies greatly due to manufacturing variations and the like.

That is, in the above configuration, the heat sensitive body 13 is placed in the water passage.
In addition, since heat is supplied from the base 2 to the heat sensitive body 13 through the base lid 6, the heat sensitive body 13 is easily cooled by water passing through the valve device. Therefore, variations in the Curie point during the manufacture of the heat sensitive element 13 greatly affect the base temperature when the valve body 15 is opened and closed, and even when the base temperature reaches a predetermined temperature, the supply of water to the vaporization chamber 3 is not performed. There was a problem that there were cases where it was not possible. Similarly, variations in assembly of the heat sensitive element 13 and the base lid 6 also change the heat conduction of the contact portion, causing the above-mentioned problem.

Purpose of the invention The present invention has been made by focusing on the above-mentioned problems.It is an object of the present invention to reduce the variation in the operation of the valve device due to the variation in conventional manufacturing, improve the yield, and provide a highly reliable steam iron. It is something.

Structure of the Invention In order to achieve this purpose, the steam iron of the invention includes a heat sensitive body with the Curie point set at a predetermined temperature, which is placed in the water passage leading from the nozzle to the vaporization chamber, and a protruding member provided in the vaporization chamber. By directly contacting and thermally connecting the heat sensitive body and the heat sensitive body through the base cover, the heat supply from the base of the heat sensitive body is increased and the influence of the cooling effect of water around the heat sensitive body is reduced. It is made smaller.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a sectional view of essential parts of a steam iron according to an embodiment of the present invention. In this figure, the same parts as in the conventional example are given the same numbers. Further, the parts of the steam iron of this embodiment that are not shown in FIG. 3 have the same structure as the conventional example.

In the figure, in a vaporization chamber 3 formed in a base 2, one or more columnar protruding members 2' are provided. The upper end surface of this protruding member 2' comes into contact with the heat-sensitive element housing portion 6' of the base lid 6 to supply heat to the heat-sensitive element 13.

The operation of the valve device shown in FIG. 3 is the same as that of the prior art example, so a description thereof will be omitted.

FIG. 4 shows an example of experimental results in which the correlation between the base temperature and the temperature of the heat sensitive body was measured when the base temperature was gradually increased. Note that this experiment was conducted with water in the valve device. In the figure,
A is a curve in the steam iron of this embodiment, and B is a curve in the conventional example. In the figure, in both curves A and B, while the base temperature is relatively low, the temperature of the heat sensitive body increases as the base temperature rises, but in the case of conventional example B, the base temperature is 100
When the temperature reaches around 0.degree. C., the heat of vaporization of the heat sensitive element 13 is taken away by the surrounding water, making it difficult for the temperature to rise. However, in the case of this embodiment A, since heat is supplied by the protruding member 2', the fluctuation in temperature rise is small.

Now, with reference to FIG. 4, the permissible range of variation in the Curie point of the heat sensitive body 13 will be explained. For example, when trying to set the base temperature during operation of the valve device to a temperature range of 10°C as shown in b, in the case of conventional example B, the permissible range of variation in the Curie point of the heat sensitive element 13 is 2°C as shown in c. becomes very narrow. However, in the case of Example A, the temperature is 7° C. as shown in a, which means that the variation tolerance range may be three times or more larger.
In other words, if a heat sensitive body having the same tolerance for variation in the Curie point is used, the operating temperature variation in Example A will be one-third or less of that in Conventional Example B.

In this embodiment, the protruding member 2' is provided at the bottom of the vaporizing chamber 3, but the same effect may be obtained by providing the protruding member 2' on the side wall of the vaporizing chamber 3 so as to contact the heat-sensitive element storage portion 6' of the base lid 6. Needless to say, it is effective.

Effects of the invention As described above, according to the invention, there is a heat-sensitive element whose Curie point is set to a predetermined temperature, which is placed in the water passage of the base lid that runs from the nozzle to the vaporization chamber and covers the upper part of the vaporization chamber, and which is placed inside the vaporization chamber. By improving the heat reception from the base of the thermosensitive element by contacting and thermally connecting the protruding member with the protruding member, it is possible to widen the permissible range of variation in the Curie point of the thermosensitive element. Even if the water tank is removable and the heat-sensitive element is placed on the base lid, as shown in Figure 2, it is possible to reduce manufacturing variations in the valve device and provide a high-yield, highly reliable steam iron. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view of a conventional steam iron, Fig. 2 is a partially sectional view of the same, and Fig. 3 is a sectional view of essential parts of a steam iron showing an embodiment of the present invention.
FIG. 4 is a graph showing the correlation between base temperature and heat sensitive body temperature. 2... Base, 2'... Projecting member, 3... Vaporization chamber, 6... Base lid, 7... Water tank, 8... Nozzle, 12... Valve device, 13... Heat sensitive body, 1
4...Permanent magnet, 15...Valve body.

Claims (1)

[Scope of utility model registration request] A base, a vaporization chamber installed in the base, a water tank that has a nozzle for supplying water to the vaporization chamber and is detachable from the vaporization chamber, and a water passage in the base lid that runs from the nozzle to the vaporization chamber and covers the top of the vaporization chamber. A heat sensitive body with a Curie point set at a predetermined temperature is disposed in the chamber, and a valve device that controls water supply from the water tank to the vaporization chamber by a valve body interlocking with a permanent magnet is provided. A steam iron that is thermally connected by direct contact with a provided protruding member.