JPS60220012A - Hot water feeder - 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 water heater such as a coffee boiler used in general households.

Structure of the conventional example and its problems In the conventional water heater of this type, as shown in FIG. The on-off valve 3 is opened and closed by interlocking a temperature sensing plate 4 and a valve plate 5 made of bimetal in the shape of an inverted spring. In this configuration, when the water in the water tank 1 is heated by the heater 2, the temperature sensing plate 4 is reversed and pushes down the valve plate 6, so that the hot water in the water tank 1 flows out to the outside. However, in this configuration, the temperature sensing plate 4 is close to the heater 2, and the convection of water due to heating directly hits the temperature sensing plate 4.

Although the temperature sensing plate 4 can follow the water temperature, the temperature sensing plate 4
The bimetal that makes up the temperature sensor is 10
Since it may not work even if it reaches 0°C, what is the operating temperature of the bimetal? With sufficient consideration, the temperature was set at about 6°C lower than the boiling temperature, and as a result, the water in the water tank 1 could not reach boiling or anything close to it. Furthermore, since the hot water supply valve section having the temperature sensing plate 4 and the heater 2 are not related, a thermostan must be provided separately as a means for sensing the temperature of the hot water and opening the heating means. It was also expensive in terms of cost.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and provides a highly safe water heater that can reliably boil the water in the water tank and supply hot water, and that is free from the risk of the heater drying out. The purpose is to provide.

Structure of the Invention In order to achieve the above object, the present invention provides a water tank having a heater, a power supply switch for supplying power to the heater, a recess provided in the inner bottom of the water tank, and a hot water supply via the recess. a water supply path for discharging water out of the water tank; and a water stop valve made of a bimetal and provided in the recess and opening and closing the hot water supply path.

The water temperature sensing member is provided in the hot water supply path and is made of a shape memory alloy and operates the water stop valve, and the power supply switch is opened in conjunction with the movement of the water temperature sensing member. According to this configuration, a water stop valve made of bimetal that opens and closes the hot water supply path is provided in the recess provided at the inner bottom of the water tank, so regardless of whether the amount of water in the water tank is small or full. The water temperature in the recess rises more slowly than in the water tank, so if the water in the water tank boils and bubbles suddenly occur, the water will be stirred violently, and the water temperature in the recess will also rise rapidly. .

As a result, even if there are variations in the operating temperature of the water stop valve, it is possible to always supply boiling hot water reliably.

In addition, the power supply switch that supplies power to the heater is opened in conjunction with the movement of a water temperature sensing member made of a shape memory alloy, which is installed in the hot water supply path, so that when the water stop valve opens and hot water supply starts, At the same time, the power to the heater is definitely cut off, and as a result, there is no risk of the heater drying out, improving safety. It is something that can be measured.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 2 to 4, 11 is a water tank, and a heater 12 is provided at the bottom of the water tank 11. 1
Reference numeral 3 denotes a basket, and a glass container 14 for receiving an extracted liquid of coffee or the like is disposed below the basket 13. Reference numeral 16 denotes a base on which the glass container 14 is placed, and which is equipped with a heat-retaining heater 17 inside that is turned on and off by a heat-retaining thermostat 16. This base 16 and the water tank 11 are connected by a support portion 18. Fixed. 19
is a recess provided to protrude downward from the inner bottom of the water tank 11, and a restriction hole 20 is provided at the upper end of the recess 19 to prevent excessive convective water due to heating from entering the recess 19.

Further, the lower part of the recess 19 is connected to one end of the hot water supply path 21, and the other end of the hot water supply path 21 is open above the basket 13. Reference numeral 22 denotes a water stop valve made of bimetal and provided in the recess 19, and this water stop valve 22 opens and closes the hot water supply path 21. Further, a diaphragm 23 is provided in a part of the hot water supply path 21, and a water temperature sensing member 24 made of a shape memory alloy formed in a coil shape is provided between the diaphragm 23 and the bottom of the recess 19. and a water temperature sensing member 24 made of shape memory alloy.
expands at about 80° C. and pushes down the diaphragm 23. 26 is a lever having one end in contact with the diaphragm 23 and the other end in contact with the second lever 26;
The lever 26 is rotatably supported. 27 is a retaining portion provided on the second lever 26. 28 is the second lever 26
This is the second lever spring that urges the .

Reference numeral 29 denotes a third lever, and this third lever 29 is provided to be movable up and down, and is always urged upward by a third lever spring 30. 31 is a hook that engages with the engaging portion 27 of the louver 26. Further, the lower end of the third lever 29 opens and closes the power supply switch 32 of the heater 12 by moving up and down. Reference numeral 33 denotes a manual lever having a knob part 34 and a protruding part 35;
Rotate counterclockwise by pushing up.

Next, the electric circuit will be explained with reference to FIG. The power supply 32 is connected in series, and the heat retention heater 17 and the heat retention thermostat 16 are connected in series.

The operation will be explained based on the above configuration. First, a desired amount of water is put into the water tank 11, all the coffee grounds are stored in the basket 13, and the glass container 14 is placed on the base 16. When the power is fully turned on, electricity is applied to the heat-retaining heater 17 to heat the glass container 14. Next, when the knob part 34 of the manual lever 33 is pushed down, the third lever 29 moves downward, the hook 31 and the engaging part 27 are engaged with each other, and the third lever 29 is moved downward.
The lower end of the lever 29 closes the power supply switch 32 to energize the heater 12 . This heats the water in the water tank 11. The water temperature in the water tank 11 rises at a constant temperature increase rate, but the recess 19
1 and is blocked to some extent by the restriction hole 20, so water convection occurs.

As a result, the rise in water temperature is small. Further, when the water in the water tank 11 is heated and boiled, bubbles are rapidly generated in the water tank T, and the water is stirred violently, so that the water temperature in the recess 19 rises rapidly. Then, the water stop valve 22 made of bimetal detects the temperature f'(r) in this recess 19 and reverses itself. In this case, even if the operating temperature of the water stop valve 22 varies widely, it can be easily operated at boiling temperature. I can do it.

That is, the water stop valve 22, which has an upwardly convex shape, detects the boiling temperature of the water in the recess 19, inverts to a downwardly convex shape, and opens. As a result, the boiled water is transferred to the hot water supply path 2.
1 , rapidly heating the water temperature sensing member 24 , and dripping into the basket 13 from the other end opening of the hot water supply path 21 . And the coffee liquid extracted in the basket 13.

While the water in the water tank 11 is being heated by the heater 12, it accumulates in the glass container 14 which is heated by the maintenance heater 17 provided inside the base 16. On the other hand, the water temperature sensing member 24 heated by the boiling water is deformed into a memorized shape and stretches more than when it is at a low temperature, so that the diaphragm 23 is pushed down, and the movement of the diaphragm 23 is controlled by the second lever 26. Gara second lever 2
6, and the second lever 26 rotates clockwise. Due to this rotation, the engagement portion 27 of the second lever 26 and the hook 31 of the third lever 29 are disengaged, so that the third lever 29Rg3 is pushed up by the lever spring 30 and returned upward, and the power supply switch 32 is Open the heater 12
Cut off the power to. That is, since the water in the water tank 11 is busy ensuring that the water boils before opening the water stop valve 22,
High-temperature, clean, high-quality hot water can be obtained, and since the movement of the water temperature sensing member 24 and the power supply switch 32 are linked, there is no risk of dry heating of the heater 12, and safety is extremely high. . Since the high-temperature, high-quality hot water is dripped onto the coffee powder in the basket 13, the coffee powder swells well and a delicious and aromatic coffee liquid can be extracted. It is kept in a container 14 and kept warm. When water is poured into the water tank 11 after hot water supply, the water stop valve 22 suddenly closes.
As the water is cooled, the water stop valve 22 deforms into an upwardly convex shape and closes. By closing the water stop valve 22, the space between the recess 19 and the hot water supply path 21 is closed, so that it is possible to continue heating and hot water supply, and the operability is very good.

In addition, if the heater 12 is energized and the heating is to be completely interrupted, push up the knob 34 of the manual lever 33 completely, the manual lever 33 will rotate counterclockwise, and the protrusion 36 will push the second lever 26. Therefore, the engaging portion 27 of the second lever 26 is disengaged from the hook 31 of the third lever 29. As a result, the third
The lever 29 is pushed up and returned upward by the third lever spring 30, and the power supply switch 32 is opened to interrupt the power supply to the heater 12. Furthermore, by constructing the water temperature sensing member 24 with a shape memory alloy such as a titanium-nickel alloy, the displacement of the diaphragm 23 can be obtained by approximately 4 to 5 mm.
Generated force is also about 700 gf.

In addition, if the transformation point of the shape memory alloy is set between 6°C and 90°C, even if the transformation point of the solid varies, the temperature K of the inflowing hot water will be 100°C. Since the water temperature sensing member 24 operates reliably to open the power supply switch 32, its safety is extremely high.

Effects of the Invention As is clear from the above embodiments, the water heater of the present invention has the following features:
A bimetallic water stop valve that opens and closes the hot water supply path is installed in the recess in the inner bottom of the water tank, so regardless of whether the amount of water in the water tank is small or full, the water temperature in the recess remains constant. The rise is slower than that in the water tank5. Therefore, when the water in the water tank boils and bubbles are suddenly generated, the water is stirred violently and the water temperature in the recess also rises rapidly. As a result, the water stop valve Even if there are variations in the operating temperature of
It is possible to reliably supply hot water at a constant boiling temperature. In addition, the power supply switch that supplies power to the heater is opened in conjunction with the movement of a water temperature sensing member made of a shape memory alloy that is installed in the hot water supply path, so that when the water stop valve opens and hot water begins to be supplied, At the same time, the power to the heater is definitely cut off, and as a result, there is no risk of the heater drying out, improving safety. It is something that can be measured.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a conventional water heater, Fig. 2 is a cross-sectional view of a water heater according to an embodiment of the present invention, Fig. 3 is an enlarged longitudinal cross-sectional view of the same main part, and Fig. 4 is a cross-sectional view of the water heater according to an embodiment of the present invention. The circuit diagram, FIG. 5, is a diagram showing the entire temperature rise curve of water temperature. 11...Water tank, 12...Heater,
19. River... recess, 21... hot water supply path, 22...
... Water stop valve, 24 ... Water temperature sensing member, 32
・・・・・・Power switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 41!1 Figure 5 Discussion

Claims (1)

[Claims] A water tank having a heater, a power supply switch for supplying power to the heater, a recess provided in the inner bottom of the water tank, a hot water supply path for fully valve- ing the recess to discharge hot water out of the water tank, and the recess. a water stop valve made of a bimetal that is provided within the hot water supply path and opens and closes the hot water supply path; and a water temperature sensing member that is provided within the hot water supply path and made of a shape memory alloy;
A water heater characterized in that a power supply switch is opened in conjunction with the movement of the water temperature sensing member.