JPS6115361Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a steam generator used, for example, in a cooker that uses steam to cook food, etc., and is particularly designed to further improve the safety of the steam generator. It is.

This invention will be described below with reference to the illustrated embodiments. Reference numeral 1 denotes a closed water supply tank that stores water W therein, and is integrally formed of synthetic resin. Reference numeral 2 denotes a cap with a circular planar shape that is detachably attached to the outlet 3 of the water tank, and has a valve 6 biased by the force of a spring 5 so as to close the outlet hole 4 formed in the center. We are prepared.

Reference numeral 7 designates a water receptacle that is made of synthetic resin and has a water receptacle 8 with a square planar shape formed in the upper part, and a connection port 9 and an exhaust port 10 in the opposing parts of the lower part. A protrusion 12 is provided at the center of the drain hole 4 to open the outflow hole 4 by coming into contact with the valve stem 11 connected to the valve 6 when the water tank 1 is installed.

13 is a drainage hole which can be opened and closed by a cap 14, 15 is a communication hole, 16 is a steam generator,
It is structured as follows. That is, 17 is a cast body made of particularly sticky aluminum material, and the upper opening 18 is sealed with a metal lid 19. Reference numeral 20 denotes a rubber gasket sandwiched between the lid and the upper periphery of the main body 17; 21 represents a bent portion formed on the outer periphery of the lid 19;
This is provided to prevent the gasket 20 from escaping outward more than necessary when the screw 22 is tightened to the main body 17 via the screw 9, and to increase the strength of the lid 19 itself.

23 is a sealed steam generation chamber formed between the lid 19 and the main body 17, 24 is a mounting seat for the screw 22, 25 is a screw hole for the screw 22, and 26 is a water reservoir formed at one end of the main body 17. 27 is a water inlet formed on the side wall surface of the main body 17 corresponding to this water reservoir, and the position of this water inlet is on the side opposite to the water inlet 27 across the water reservoir 26, as shown in FIG. It is designed in advance to be located below the inner bottom surface of 17 by a predetermined dimension (H) (several mm in the embodiment). Reference numeral 28 denotes a connection tube that communicates the water supply port 27 with the connection port 9 of the water receiver 7, and is made of a highly heat-resistant material such as silicone rubber.

Reference numeral 29 denotes a plurality of convex portions protruding from the inner bottom surface of the main body 17 in parallel directions, and the relative positions of the main body 17 and the water receiver 7 are determined so that the water level is set several mm above the convex portions. There is.

30 is a steam release hole provided at the end of the lid 19, which is the farthest part from the water supply port 27, and 31 is a steam release tube with one end fitted into this release hole, which is made of silicone rubber or the like. The cross-sectional area is set approximately equal to or slightly smaller than the cross-sectional area of the water supply port 27.

Reference numeral 32 denotes a U-shaped sheathed heater whose middle portion is bent in advance into a U-shape, and is provided on the outer bottom surface of the main body 17 so that the U-shaped bent portion 33 is located on the water reservoir portion 26 side. Reference numerals 34 and 34 denote a pair of presser pieces integrally formed on the outer bottom surface of the main body 1. After inserting the sheathed heater 32 between the presser pieces, the sheathed heater 32 is preliminarily pressed by clamping the presser pieces 34 and 34 from the outside. is held in close contact with the bottom surface of the main body 17.

35 is an electrical terminal of the sheathed heater 32; 36 is a temperature fuse mounting plate provided on the outer bottom surface of the main body 17 and on the opposite side of the water reservoir 26 across the U-shaped bent portion 33 of the sheathed heater 32; body 1
It is fixed to a convex portion 38 formed on the bottom of 7.
39 is an electrically insulating tube whose peripheral surface is held by a fuse mounting plate 36, and a temperature fuse 4 is installed inside.
0 is stored.

41 is a mounting base formed on the outer bottom surface of the main body 17;
A temperature regulator 42 is installed to control the energization of the heater 32 so as to maintain the temperature of the steam generation chamber 23 at a predetermined temperature. However, the convex portion 29 is not formed in the portion corresponding to the upper value of the temperature regulator. 43 is a lead wire electrically connecting the temperature regulator 42, temperature fuse 40, and heater 32 in series, and 44 and 45 are legs.

In the above configuration, when the water supply tank 1 filled with water W is installed on the water receiver 7, the outflow hole 4 is opened, and the water is supplied from the water supply port 27 to the inner bottom of the steam generation chamber 23 via the communication hole 15 and the connection port 9. Water will be supplied. At this time, the water supply water level is set to be several mm above the convex portion 29, and because there is a water reservoir 26, a large amount of water flows into the steam generation chamber 23 at once even though it is the first water supply. There will be no problem of inflow.

Next, when the heater 32 starts to be energized, the generation chamber 23
Because the temperature at the bottom of the tank is high and the water level is low, steam is generated in a short period of time. Since the steam generated here is squeezed and released by the steam release tube 31, the pressure in the release chamber 23 naturally increases, which works to push the hot water in the generation chamber 32 back out through the water supply port 27. Easy, especially water inlet 2
Since the opening position of 7 is located below the inner bottom surface of the generation chamber 23 by a predetermined dimension (H), there is a water head corresponding to that dimension, and therefore the water level in the generation chamber 23 is slightly below the bottom surface. At this point, the amount of steam generated decreases and the pressure drops, so that the backflow of hot water from the water reservoir 26 to the water supply port 27 is prevented, and the water receptacle 7 or water supply tank made of synthetic resin or the like is prevented. Accidents such as thermal destruction or deformation of water container 1 or overflow of water from water receiver 7 can be prevented.

If the water supply tank 1 runs out of water and water supply is no longer performed, the temperature controller 42 senses a rise in the temperature of the steam generation chamber 23 and shuts off the power to the heater 32 (for example, 130 If the temperature fuse 40 fails to operate due to a malfunction or the like, the temperature fuse 40 is blown (for example, at about 170°C) to prevent the temperature from rising too high. In this case, by locating the U-shaped bent portion 33 of the heater 32 on the side of the water inlet 27, cold water is supplied from the water inlet 27 to the U-shaped bent portion 33, which has the highest temperature in the heater 32 itself. This allows the temperature of the entire bottom surface of the steam generation chamber 23 to be made substantially uniform, thereby allowing steam to be generated uniformly from the entire bottom surface. Since there is no local overheating, its life can be extended, and since it is close to the water supply port 27, even in the event of dry firing, the U-shaped bent portion 33 is unlikely to reach a high temperature. The effect is further enhanced when a water reservoir 26 is provided as shown in FIG.

As described above, according to this invention, water is supplied from the water supply port so that water at a predetermined level is stored in the steam generation chamber heated by a heater having a U-shaped heating wire bent part. The side bottom of the steam generation chamber is recessed to provide a water reservoir for storing water supplied from the water supply port, the water supply port is disposed at a lower position than the inner bottom of the steam generation chamber, and the U-shaped bent portion is formed. Since the heater is attached to the bottom of the steam generation chamber so as to face the water reservoir, the following unique effects are achieved.

In other words, even if the water level in the steam generation chamber drops to zero, since there is water in the water reservoir, the U-shaped bent part of the heater, which has a particularly large heat generation density, will not be locally overheated, and the life of the heater can be extended accordingly. can.

In addition, since a large amount of water does not rush into the steam generation chamber at the time of the first water supply, the liquid level does not fluctuate greatly, making it possible to generate an even and constant amount of steam from the beginning. Even if the pressure inside the steam generation chamber rises rapidly during steam generation, the water head corresponding to the height between the inner bottom of the steam generation chamber and the water inlet prevents backflow from the water reservoir to the water inlet. Therefore, it has the unique effect of being able to prevent backflow without the need for a check valve or the like.

Note that instead of the U-shaped heater as in the above embodiment, a single-end terminal heater may be used in which the heating wire is bent into a U-shape and both ends of the heating wire are placed on the terminal side. What is necessary is just to provide it so that the end of the side is on the water reservoir side.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the steam generator according to this invention, FIG. 2 is a bottom view of the main part thereof, and FIG. 3 is a plan view of the main body of the steam generator. In the figure, 1 is a water tank, 16 is a steam generator, 1
7 is the main body, 23 is the steam generation chamber, 26 is the water reservoir, 2
7 is a water supply port, 29 is a convex portion, 32 is a heater, 33 is a U-shaped bent portion, 40 is a temperature fuse, and 42 is a temperature regulator.

Claims (1)

[Scope of utility model registration request] Water is supplied from the water supply port so that water at a predetermined level is stored in a steam generation chamber heated by a heater having a U-shaped heating wire bent part, and the side bottom of the steam generation chamber is recessed. A water reservoir is provided for storing water supplied from the water supply port, and the water supply port is disposed at a lower position than the inner bottom of the steam generator, and
A steam generator characterized in that a heater is attached to the bottom of the steam generator so that the letter-shaped bent part faces the water reservoir part.