JPS60174118A - Pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for heating water to boil water, and more particularly to a water heater that cuts off the power supply to the heating device after the water has been reliably boiled.

Structure of conventional example and its problems In general, it is preferable that the hot water used for brewing tea, coffee, or black tea be boiled. There was a method for detecting water temperature in a water heater configuration that cut off power supply to the heating element after boiling, but in this case, the boiling point of water is 100°C at 1 atmosphere, and extremely accurate detection equipment was used. Therefore, boiling control was practically difficult. A method was also considered to detect the steam that is rapidly generated during boiling, but in this case, in order to prevent malfunctions caused by the steam that is generated before boiling, a steam passage was led from the container containing the water to the outside of the main body. However, a vapor detection element was provided near this outlet opening. This method had the drawbacks of a large vessel and a complicated steam passage, making it expensive.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, and to provide a water heater that is extremely simple in construction and that cuts off power supply to the heating device after reliably boiling water. .

Structure of the Invention In order to achieve the above object, the present invention provides a container containing a liquid, a heating device provided at the bottom of the container, and a vapor detection element provided at the upper part of the container and at the end. , a mounting cylinder having a partition wall that roughly divides the cylinder into two and having an opening on the side of the container, a lid covering the top surface of the container and having a steam discharge port, and a shielding plate having a ventilation hole, A compartment is formed by the lid and the shielding plate, and the opening of the approximately bisected mounting tube and the compartment are communicated through a small hole. With this configuration, the water in the container is boiled. Until now, the vapor detection element was kept at a low temperature, and the vapor rapidly generated by boiling was applied to the vapor detection element through the vent hole, thereby detecting boiling and controlling the energization.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Figures 1 to 5, 1 is a cylindrical container outer body;
A spout 2 is fixed to the opening at the upper end, and a bottom plate 3 is integrally attached to the lower end. 4 is a handle rotatably attached to the spout 2. Reference numeral 6 denotes an upper lid that is attached to the spout 2 so as to be openable and closable.
It is fastened so that it can be opened and closed by lock knobs 6 provided on both sides of b. A cylindrical portion 5C with an open top is provided in the center of the upper lid 5, and a push plate 7 that is vertically slidable is provided within the cylindrical portion 6c. Numeral 8 is a lock ring that restricts the upward and downward sliding movement of the push plate 7, and is engaged with a switching lever 9, so that the vertical movement of the push plate 7 can be selected.

Reference numeral 10 denotes a bellows pump provided at the lower part of the push plate 7, which is sealed by attaching the upper surface to the upper plate 11 and the lower surface to the lid cover 12 by ultrasonic welding or the like.

In addition, there is a ventilation hole 11a in the center of the upper plate 11.
When the pusher 7 moves downward, the vent 11a is closed by the lower end of the push rib 13 & provided at the center of the steam cover 13 integrally engaged with the pusher plate 7, and when the pusher plate 7 moves upwards. A movable valve 14 that can open the vent 112L is provided. Between this movable valve 14 and the lower part 11b of the upper plate 11 [1
4. A coil spring for returning the movable valve 14 is interposed.

In addition, the lower part 11b of the upper plate 11 and the upper surface part 12 of the lid cover 12
Between & is a coil spring 1 for returning the bellows pump 1o.
6 is interposed. Reference numeral 12b is a spout provided approximately in the middle of the upper surface 12& of the lid cover 12, and the spout 12b
6 communicates with the discharge port 17 & of the lid body 17 made of resin. Reference numeral 18 denotes a communication backing provided on the upper plate 11 to allow airtight communication between the nine vent holes 11a and the steam cover 13. Further, the upper opening 13b of the steam cover 13 faces the steam hole 7a provided in the push plate 7.

The container 19 is a bottomed container installed in an outer shell 1, and has a flange 19a at the upper end thereof, and is supported by the spout 2 via a container backing 2o. The lid 17 placed on the top surface of the container 19 has a discharge port 17a in the center for discharging steam, and a valve chamber 22 containing an overflow prevention valve 21. A shielding plate 23 made of a stainless steel plate or the like is fixed to the lower surface of the lid 17 with screws or the like, and the lid 17 and the shielding plate 23 form a compartment.

The container 19 and the lid 17 are held airtight by a 24-piece waterproof backing. 25 This is a water rising pipe extending from the valve chamber 22 to the bottom of the container 19, and its upper end is provided with a spout 26a extending outward from the container 19 and opening downward at its tip. The spout pipe 26 is connected to the valve chamber 22 via a valve cover 27.

Reference numeral 28 denotes a ventilation hole having an L-shaped passage provided at the bottom of the shielding plate 23, the tip of which is partially cut off.

230 is a heat exhaust hole having a smaller diameter than the ventilation hole 28.

Reference numeral 29 denotes a mounting tube which is provided in the upper part of the container 19, has a vapor detection element at its end, and is made of polysulfone resin or the like, and this mounting tube 29 is shown in FIG.

As is clear from the detailed view of FIG.
The flange portion 29a is exposed through the ring 30, and the cylindrical portion 29
It extends outward from the hole provided in the container 19. Further, the container 190 is provided in a watertight manner by a mounting spring 32 mounted between the container 190 and a mounting bracket 31 which is hooked and fixed by rotation on a stopper portion 290 provided on the cylindrical portion 29b. Further, the contact ribs 29d at both ends of the flange 29IL are in contact with or close to the shielding plate 23, and there is a slight gap C in the center.
have. The interior of the cylindrical portion 29b of the mounting tube 29 is provided with a partition wall 296 which is divided into approximately two halves, except for a part of the tip, and a through hole 23 is provided in the shielding plate 23 corresponding to this bisected opening.
a l 23b is provided, and one through hole 23&
The openings of the ventilation holes 28 are provided opposite to each other.

33 is a vapor detection element provided at the tip of the mounting tube 29 via a thermobacking 34, and a manual return type thermoswitch with an OFF temperature set at approximately 80°C to 96°C is used. By attaching it to the mounting fitting 31 with screws or the like, the heat-sensitive surface is exposed inside the mounting tube 29. In addition, the thermo backing 34 and the mounting tube 2
The abutment surface 9 is inclined, and the sealing between the vapor detection element 33 and the thermobacking 34 is more reliable in the radial direction as well.

Reference numeral 36 denotes a display plate fixed to the outer body 1 of the container, and in the center of the interior there is a water conduit pipe 37 that guides the hot water coming out of the spout 26 and out of the container.
is provided, as well as a thermo switch 3 on the front.
An operating lever 38 for setting the switch 3 to ON is provided. 39 is a water level gauge window.

Reference numeral 40 denotes a band-shaped or heating device provided on the outer peripheral surface of the bottom of the container 19, which includes a heater 40a for boiling water and a heater 40 for keeping warm.
b is integrated. Near the top of this heating device 40, a water boiling thermostat 41 is connected in parallel with the thermoswitch 33, and a safety thermostat 42 is disposed in series therewith. 43a is the heat retention heater 4
0b, a thermal reed switch 43bld and a temperature fuse, which are held pressed against the bottom surface of the container 19 by a presser spring 44. 45 is an electrical connector, and 46 is a back plate. The electric circuit is as shown in FIG.

Next, the operation of the above configuration will be explained.

First, water is poured into the container 19 so that it does not reach the mounting tube 29, and then the thermoswitch 33 is set to ON, and power is supplied to the heating device 40. Then, the water in the container 19 is heated, and the water temperature rises as shown by the solid line in FIG. At the same time, the temperature in the container space B formed by the water surface and the shielding plate 23 increases slower than the water temperature. Therefore, the mounting tube 2
The temperature of the thermo switch 33 provided in the mounting tube 2
9, the temperature changes at an even lower temperature as shown by the broken line in FIG.

When the water temperature in the container 19 reaches a temperature of about 96°C (1+ point), a little more steam starts to come out, the temperature in the container space B becomes close to the water temperature, and the steam passes through the ventilation hole 28 and flows into the compartment. It enters into A, but does not directly enter into the mounting tube 29,
The temperature of the thermoswitch 33 is kept low.

When the water temperature reaches the boiling point (time point 12), a large amount of steam is suddenly generated, filling the container space B with L-1 and shielding it from the ventilation hole 28 as shown by the arrows in FIGS. 2 and 3. Board 2
It enters into the mounting tube 29 through the through hole 23& of No. 3, rapidly raises the temperature of the thermoswitch 33, turns it off, and reaches the interval A through the through hole 23b. The operating temperature (T3) of the thermoswitch 33 is set to turn off at 80 to 95°C, but since the temperature rises rapidly after water boils, it reliably detects boiling and operates.

After the power supply to the water heater 40 & of the heating device 40 is cut off by turning off the thermoswitch 33, the water temperature is maintained at about 96° C. by the thermal reed switch 413b. Therefore, a large amount of steam is not generated, and therefore the temperature of the thermoswitch 33 also falls below the water temperature.

After the temperature of the thermoswitch has fallen below the OFF operating temperature, if you turn it on again and operate it, the hot water will be heated and boiled, and a large amount of steam will be generated again, similar to the above.
At the same time as the temperature inside the mounting tube 29 is rapidly raised, the temperature of the thermoswitch 33 is also rapidly raised to turn it off.

Next, a description will be given of when half of the hot water in the container 19 is taken out, water is poured in, and the thermoswitch 33 is turned on again.

When water is poured at time 14 in FIG. 6, the water temperature drops rapidly. Although the temperature of the thermoswitch 33 falls later than the water temperature due to the residual heat of the container 19 and the mounting tube 29, it is maintained at the ambient temperature of the mounting tube 29 even after the water temperature starts to rise. When the water temperature reaches the boiling point, a large amount of steam fills the container space B, and the steam also enters the mounting tube 29 through the ventilation hole 28), causing the thermoswitch 33 to rapidly rise in temperature.
Activate FF.

Note that the steam coming out of the discharge port i7a of the lid body 17 passes through the bellows 10 and the ventilation hole 11&, and is discharged from the steam hole 7a to the outside of the book.

Still thermo switch 33 and water boiling thermostat 4
1 is installed in a parallel circuit with the hot water heater 40&, so if the thermostat 41 detects the water temperature and the water temperature reaches around 96°C when the power is turned on without setting the thermo switch 32. , water heater 4
Turn off the power to 01L and complete boiling water.

In the above embodiment, a thermoswitch was used as the vapor detection element, but a temperature-dependent resistance variable element such as a thermistor or a shape memory alloy may be used as the vapor detection element to detect the temperature and turn off the power to the heat generating device. be.

Effects of the Invention As described above, the present invention has the following excellent effects.

＼ A vapor detection element is provided in the upper part of the container, and a mounting tube is provided that has a partition wall that roughly divides the inside of the tube into two and has an opening on the container side, and a compartment is formed by a lid and a shielding plate that has ventilation holes. At the same time, since the opening of the approximately two-part mounting tube and the compartment are communicated through a small hole, the temperature of the vapor detection element is kept low until the water in the container boils, and the temperature of the vapor detection element is maintained at a low temperature until the water in the container boils. Boiling is detected by exposing the generated steam to a steam detection element through a vent, and as a result, the power supply to the heating device can be reliably cut off after a large amount of steam is generated.

(2) Since the vapor detection element is attached to the upper part of the container, the mounting structure is extremely simple and can be obtained at low cost.

(3) The steam detection element is located inside the container and can detect steam without ejecting steam outside the container, so compared to the conventional method that detects steam discharged from a steam outlet outside the container, it is less likely to cause burns. There is no risk of such problems, and it is extremely safe. Furthermore, since the same pump device as in the conventional system can be used in an air pump type water heater, it is not good if the configuration becomes complicated.

(4) By changing the size of the gap C between the opening of the mounting tube and the shielding plate, it is possible to change the balance of steam entering from the container space B side and from the compartment A side, and as a result, the steam By shifting the timing of the steam hitting the detection element, the boiling time can be set freely.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a water boiler and a vessel showing an embodiment of the present invention.
Figure 2 is a sectional view of the water heater, Figure 3 is a sectional view of its installation,
Fig. 4 is an exploded perspective view showing the installation configuration of the vapor detection element, Fig. 6 is a sectional view of the same installation, Fig. 6 is a circuit diagram of the water heater, and Fig. 7 is the temperature one-hour characteristics of each part of the water heater. It's a diagram. 17... Lid body, 19... Container, 23.
... Shielding plate, 28 ... Ventilation hole, 29 ...
...Mounting tube, 29 &... Flange, 29b...
...Cylinder part, 29c...Part of stopper, 2915
......Bulkhead, 3o...0 ring, 31.
...Mounting bracket, 32...Mounting spring, 33
. . . Steam detection element, 40 . . . Heating device. Figure 1 Figure 2 Figure 3 Figure 8 3C Figure 5 Figure 6

Claims (4)

[Claims] (1) A container containing a liquid, a load-bearing device provided at the bottom of the container, a vapor detection element provided at the upper end of the container, and a partition wall that roughly divides the cylindrical portion into two. A mounting cylinder having an opening on the side of the container, a lid covering the upper surface of the container and having a steam discharge port, and a shielding plate having a ventilation hole, the lid and the shielding plate forming a compartment. At the same time, the water heater is configured such that the opening of the approximately bisected mounting tube and the compartment are communicated with each other through a small hole. (2) The water heater according to claim 1, wherein the lid body and the shielding plate are integrally connected and can be freely attached to and detached from the container. (3) The shielding plate is provided with two through holes facing the opening of the bisected mounting tube, and a ventilation hole is opened opposite to one of the through holes. The water heater described in paragraph 1. (4) A flange is provided at the opening of the mounting tube, and an appropriate number of stoppers are provided on the outer periphery of the cylindrical portion, and the cylindrical portion is extended outward from the inside of the container via an O-ring on the flange. Claim 1, wherein a part of the stopper is provided with a mounting fitting that locks by rotational movement, and the mounting tube is held watertightly in the container by the urging force of a mounting spring interposed between the stopper and the outer surface of the container. Water heater as described in section.