JPS5855281Y2 - steam generator - 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. be.

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 inside, and is integrally formed of synthetic resin.

Reference numeral 2 denotes a cap having a circular planar shape that is detachably attached to the outlet 3 of this water tank, and is equipped with a valve 6 that is biased by the force of a spring 5 to close an outlet hole 4 formed in the center. There is.

Reference numeral 7 designates a water receptacle made of integrally molded synthetic resin and having a square planar shape with a hole 8 in the upper part, and a connecting port 9 and a drain port 10 in the opposing parts at 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.

Reference numeral 13 is a drain hole which is openable and closable with a cap 14, reference numeral 15 is a communication hole, and reference numeral 16 is a steam generator, which is constructed as follows.

That is, 17 is a cast body made of particularly sticky aluminum material, and the upper opening 18 is hermetically sealed with a single metal lid.

20 is a rubber gasket sandwiched between the lid and the upper periphery of the main body 17, 21 is a bent portion formed on the outer periphery of the lid 19, and the rubber gasket 20 is fastened to the main body 17 with a screw 22 through the lid 19. The gasket 20 is provided to prevent the necessary material from escaping outward 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. A predetermined dimension H (several mm in the example) from the inner bottom surface of 17
) is pre-designed to be downward.

A connection tube 28 connects the water supply port 27 and 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.

32 is a U-shaped sheet whose middle part is bent in advance into a U-shape.
This heater is provided with a U-shaped bent portion 33 on the outer bottom surface of the main body 17 such 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 pressed in advance by pressing 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; A convex portion 38 formed on the bottom of the main body 17 by
is fixed.

Reference numeral 39 denotes an electrically insulating tube whose peripheral surface is held by a fuse mounting plate 36, and a temperature fuse 40 whose operating temperature is set at about 160 to 170° C. is housed inside.

Reference numeral 41 denotes a mounting base formed on the outer bottom surface of the main body 17, on which is attached a temperature regulator 42 that controls the energization of the heater 32 so as to maintain the temperature of the steam generation chamber 23 at a predetermined temperature or lower.

However, the operating temperature of this temperature regulator is set to, for example, 130°C, and the portion directly above this is provided with the convex portion 2.
I try not to form a 9.

43 is a temperature regulator 42, a temperature fuse 40, and a heater 32
Lead wires electrically connected in series, 44° and 45 are legs.

In the above configuration, when the water supply tank 1 containing water-containing water W is installed on the water receiver 7, the outflow hole 4 is opened, and the communication hole 15,
Water is supplied to the inner bottom of the steam generation chamber 23 from the water supply port 27 via the connection port 9 .

At this time, the water supply water level is set to be several mm above the convex portion 29, and since 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 temperature at the bottom of the generation chamber 23 becomes high, and since the water level is low, steam is generated in a short time.

Since the steam generated here is squeezed and released by the steam release tube 31, the pressure inside the generation chamber 23 naturally increases, which works to push the hot water inside the generation chamber 23 back out through the water supply port 27. In particular, since the opening position of the water supply port 27 is located below the inner bottom surface of the generation chamber 23 by a predetermined distance H, there is a water head corresponding to that dimension, and therefore the water level in the generation chamber 23 is lower than the bottom surface of the generation chamber 23. When the pressure drops slightly, 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 made of synthetic resin or the like is prevented. Accidents such as thermal damage or deformation of the water supply tank 1 or water overflow from the water receiver 7 can be prevented.

In the event that the water supply tank 1 runs out of water and water supply is no longer performed, the temperature regulator 42 detects a rise in the temperature of the steam generation chamber 23 and cuts off the power to the heater 32. If the temperature fuse 40 does not operate, the temperature fuse 40 is blown to prevent excessive temperature rise.

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 approximately equal, 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 the embodiments of this invention, the following effects can be expected.

(1) Overheating of the U-shaped new curved portion of the heater can be prevented.

(2) The temperature at the bottom of the steam generation chamber can be made uniform, and steam can be generated uniformly and efficiently.

(3) Since the terminal portion of the heater can be located far from the water supply port side, even in the event of water leakage, water will not splash on the heater terminal portion, and electrical safety will be improved.

(4) A water reservoir and an overheat preventer (temperature regulator, temperature fuse, etc.) are installed across the U-shaped bent portion of the heater, so overheating can be detected before the water reservoir gets hot. operation is more reliable.

Furthermore, in the device provided with the convex portion 29, which is the gist of this invention, the amount of water stored in the steam generation chamber 23 is reduced by the amount of the convex portion 29, and the heat exchange area is increased, so steam can be generated in a shorter time. At the same time, the overtemperature preventer (at least the temperature detection part thereof) can be installed on the bottom surface of the steam generation chamber 23, especially on the surface of the convex portion 29 where impurities such as water scale are most likely to stick and accumulate due to long-term use. Since the narrow valleys between the protrusions 29 are provided in areas that avoid as much as possible, the temperature sensing condition is less likely to deteriorate due to impurity deposits, and it is safe to expect the specified temperature sensing speed and ability over a long period of time. It is possible to provide a steam generator with high performance.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the steam generator according to this invention, Figure 2
The figure is a bottom view of the main part, and FIG. 3 is a plan view of the main body of the steam generator. In the figure, 1 is a water supply tank, 16 is a steam generator, 17 is a main body, 23 is a steam generation chamber, 26 is a water reservoir, 27 is a water supply port, 2
9 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] A plurality of convex portions are formed integrally and in parallel on the inner bottom surface of a steam generation chamber provided with a heater at the bottom, and water is supplied to a predetermined water level above the convex portions. A steam generator comprising: a temperature overrise preventer for controlling energization of the heater attached to a bottom surface of the heater at a position avoiding a portion corresponding to the convex portion and a portion corresponding to a valley between the convex portions.