JPH02243116A - Electric hot-water pot - Google Patents

Abstract

PURPOSE:To prevent a reduction in hot-water discharge rate during boiling and immediately after boiling, by providing a water feed device which is linked with boiling of liquid in a container, a fan which sends air into an upper space in the container, and a detector detecting the rotation speed of a centrifugal pump. CONSTITUTION:A sensor 18 detects a temperature rise and boiling or non boiling state of the hot-water in a container 1 where the temperature of hot-water is higher than 100 deg.C and bubbles in the hot-water are in super-saturated state. Power is supplied to a water feed device 15 at the same time boiling state is detected. Protruding parts 31 of a rotary plate 30 fixed on a motor spindle come between a light emitting diode and a light receiving transistor of a rotation speed detector 32, causing the light to be shielded, and the protruding parts 31 pass away, causing the light to reach the light receiving part, so that the rotation speed is detected and the hot-water discharge rate is set according to the detected rotation speed. On end of a fan unit 35 installed beside a centrifugal pump 13 is connected to one end of an air duct 36 leading to an upper space of the container 1, and an air fan 37 of a multiple blade type, etc. is furnished in the unit 35. The fan unit 35 is electrically connected to a control circuit board 19. When the hot-water temperature in the container 1 rises and boiling state is detected, power is supplied to the fan unit 35 simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water heater that can heat and maintain the temperature of a stored liquid, and can also lead the stored liquid out of the container at any time.

Conventional technology Conventionally, electric water heaters that use an electric pump to draw out the liquid inside the container have two types: an air pump type that uses an air generating pump to increase the pressure inside the container and use that pressure to push out the liquid inside the container; There is a pumping type in which a motor is installed in the container and the motor pumps up the liquid in the container by using a pipe hanging inside the container, and a liquid pump type in which a liquid pump shown in Figures 6 and 7 is installed around the container. was there.

The liquid pump shown in FIGS. 6 and 7 has a case 1.2 made of synthetic resin, an O-ring 3, and a partition plate 4 to form a groove in a pump case portion 51. An impeller 7 having blades and rotationally driven by a rotor 6 via a magnetic coupling is rotated to suck the liquid in the container into the suction port 8 and discharge it from the spout port 9. was. The reason for using such a liquid pump is that it is possible to change the amount of liquid pumped from the container by changing the rotation speed of the motor 6.

Problems to be Solved by the Invention The liquid pump type electric water heater as described above has many advantages, such as being able to change the amount of liquid pumped and having little change in the amount of liquid pumped due to changes in the temperature of the liquid. However, in recent years, electric water heaters have
There are many types that heat the liquid to the boiling point and then keep it warm at a certain high temperature, and when the above liquid pump is installed in such a container, the pump's pumping capacity is The situation is extremely poor, and the liquid may not be able to be extracted.The reason is as follows: Although there is a partial steam passage through the top lid, the large number of microscopic bubbles contained in the boiling water have a space where they can escape. By being obstructed, the hot water is in a state of -1 with only one bubble present, and the water is pressurized, so the temperature of the hot water slightly exceeds 100°C and the bubbles are in a supersaturated state.As a result, When the liquid pump is operated, the air bubbles present in the vortex are drawn into the pump chamber of the liquid pump together with the hot water, and the negative pressure caused by the impeller 70 rotations in the pump chamber is triggered, and the supersaturated bubbles that are present in the pressurized state are easily removed. This causes the impeller 7 to spin idly, resulting in a significant decrease in the amount of liquid discharged.

Also, when extracting a fixed amount of liquid in a container, it can also be used during boiling and boiling 11! Immediately afterward, as described above, the discharge amount significantly decreases, resulting in large variations in quantitative determination, making it impractical.

The present invention solves these problems, and aims to provide a 1 Jt steam water heater that does not reduce the discharge amount even during boiling or immediately after S rises, and can discharge water at a constant rate. It is something.

Means for Solving the Problems In order to solve this problem M, the present invention provides a bottomed cylindrical container, a lid for opening and closing the upper end opening of the container, and a steam passage communicating the inside of the container with the outside of the main body. a heating element that heats the liquid contained in the container; a centrifugal pump that communicates with the container and a discharge port that opens to the outside of the main body via a water conduit; and a circulating flow that communicates with the upper part of each of the above-mentioned companies. The container is equipped with a water supply device that communicates with the water supply channel and is linked to the boiling of the liquid in the container. The present invention also provides a bottomed cylindrical container, a lid that opens and closes an upper end opening of the container, a steam passageway that communicates the inside of the container with the outside of the main body, and a heating element that heats the liquid contained in the container. and a centrifugal pump that communicates with the container and a discharge port opening to the outside of the main body via a water conduit pipe, and a blower device that blows air into the upper space of the container in conjunction with the boiling of the liquid in the container. It is. Further, the present invention provides [EJ
A means for detecting the number of rotations is provided.

Effect With this configuration, when the temperature of the hot water in the container rises and boils, the water supply device and ventilation device operate in conjunction with the boiling, so the bubbles in the hot water are no longer in a supersaturated state and most of them disappear, leading to boiling. It is possible to provide an electric water heater in which the discharge amount does not decrease during boiling or immediately after boiling. In addition, since a means for detecting the rotation speed of the centrifugal pump is provided, in combination with the water supply device and air blower device, the amount of hot water corresponding to the rotation speed of the centrifugal pump can be stabilized even during or immediately after boiling, as when keeping the water warm. You can get it.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIGS. 1 to 4 showing examples of the first dormitory, a bottomed cylindrical container 1 for storing water etc. has a heating element 2 at the bottom consisting of a high-wattage main heat generating section and a low-wattage auxiliary heat generating section. It is set up.

The container l is covered by a podium 3, and an upper frame 4 is placed on the upper end of the podium 3 to which the container 1 is fixed when inserted, and the lower end is placed on a base 5, and the container 3 is The lower end of the container 1 is fixed to the body 3 by drawing the base 5 through the back plate 7 attached with screws etc. to the container fitting 6 fixed to the bottom of the container 1, and the upper end of the container 1 is fixed to the upper frame 4. The main body is constructed by fitting it into the body. Further, a lid 8 that closes the upper end opening of the container 1 is provided on the upper part of the upper frame 4 so as to be rotatable and detachable. A steam passage 9 is provided inside the lid 8 to communicate the outside of the main body with the inside of the container 1. At the bottom of the container 1, there is provided a communicating fitting 10 whose upper end opens upwardly into the container 1, and at the lower end of this communicating fitting 10, the upper end of a branch pipe 11 is connected in a similar manner.

Further, the lower end of the branch pipe 11 is watertightly fixed to a centrifugal pump 13 provided so as to communicate with one end of the water conduit 12, and furthermore, the pipe portion 11a protruding from the il1 portion of the branch pipe 11 is connected to the upper part of the container 1. It is watertightly fixed to a water supply device 15 which communicates with a circulation channel 14. An overflow prevention valve 16 is provided in the middle of the water conduit 12, and a discharge port 17 is provided at the other end of the water conduit 12, and the tip of the discharge port 17 opens to the outside of the main body. The heating element 2 is provided with a sensor 18 such as a thermistor for detecting the temperature of the water in the container 1, and is electrically connected to a control board 19 provided below the container 1. The centrifugal pump 13, water supply table 15, and heating element 2 are also electrically connected to the control board 19.

An operating knob 20 for changing the number of rotations of the centrifugal pump 13 is provided at the upper part of the lid body 8 in the MiJ direction, and this operating knob 20 is also electrically connected to the control unit &19.

By the way, the centrifugal pump 13 is constructed as shown in FIG. That is, the case 21 is made of synthetic resin and has an inlet and a spout, and the case 23 is made of synthetic resin and fixes the sweater 22. An impeller 25 is provided which rotates at Further, in the other case 23, there is disposed a magnetic pole plate 27 which is fixed to the shaft 26 of the motor 22 and has a magnetic retainer. The nil cases 21 and 23 are separated by a row of partition plates, and one case 21 and the partition plate 28
An O-ring 29 is interposed in the darkness to hold the torpedo chamber. Further, a rotary plate 30 is fixed to the magnetic pole plate 27 fixed to the shaft side of the motor 22, and convex portions 31 are formed around the rotary plate 30 at positions facing each other and separated by 180 degrees. . The other case 23 is provided with rotation speed detection means 32 consisting of a light emitting diode and a light receiving transistor at a position sandwiching the periphery of the rotation plate 30, and this rotation speed detection means 32 is electrically connected to the control board 19. has been done. The centrifugal pump 13 having such a configuration is fixed to a heat shield plate 33 fixed to the lower side of the container 1 via a mounting bracket 34 with screws or the like.

The water supply device 15 has almost the same construction as the centrifugal pump 13. Next, the operation of the electric water heater having the above construction will be explained.

First, open the lid 8, fill the container 1 with water, and pour the # into the heating element 2.
When the water is turned on, the water in the container 1 is heated to boiling by the high-wattage main heating section, and is kept at around 95° C. by the low-wattage auxiliary heating section. At this time, the steam generated by boiling flows out of the main body through the steam passage 9 provided in the lid 8, but since the opening area of the steam passage 9 is smaller than the opening area of the container l, the steam can flow out smoothly. is hindered,
The inside of the container 1 is slightly pressurized. Therefore, the water temperature is 4th
As shown in the figure, the temperature is higher than 100°C, and the bubbles in the vortex are in a supersaturated state. The temperature of the water in container 1 increases and! v! 11m is detected by the sensor 18, and at the same time as this boiling is detected, the water supply device 15 is energized as shown in FIG. The hot water in the container 1 flows through a communication fitting 10 provided at the bottom of the container 1 and a branch pipe 11 to a water supply device 15, and is then circulated through a circulation channel 14 into the container 1 by driving the water supply device 15. Ru. From the beginning, the temperature of this circulating hot water is
The temperature in the chamber 4 suddenly drops to below 100 degrees Celsius due to mixing with the slightly lower hot water and the cooling effect of the circulation 1. The air bubbles in the bath water become liquefied as the water temperature drops, and most of them disappear. In this state, turn the operating knob 2o to remove the centrifugal pump 1.
3, the hot water in the container 1 is guided into the case 21 of the centrifugal pump 13 from the communication fitting 1 through the branch pipe 11.
Since the amount of bubbles generated by the rotation of the impeller 25 is as small as possible, it is smoothly discharged from the spout to the outside of the main body through the water conduit 12 and the discharge port Xi, and even during and immediately after boiling, the air bubbles are discharged even when kept at 95°C. It is something that can be made into something that has no difference at all. At this time, when the convex part 31 of the rotary plate 30 fixed to the shaft 26 of the motor 22 is interposed between the rotation speed detection means 32 consisting of a light emitting diode and a light-receiving transistor, light is blocked, and when the convex part 31 escapes, light is received and the rotation is stopped. It detects the number of revolutions and sets the amount of hot water according to this number of rotations.It is possible to discharge a fixed amount of water such as 1 cup or 2 cups.

Next, the second embodiment will be explained based on FIG. 5 showing the second embodiment. The difference from the first embodiment is that a blower device 35 is provided in place of the water supply device 15. Accordingly, this embodiment has a configuration as described below. First, the lower end of the communication fitting 10 is connected only to the centrifugal pump 13, and the blower device 35 installed in parallel with the centrifugal pump 13 has one end communicating with the other end of the blower pipe 36 which communicates with the upper part of the container 1. However, a blower fan 37 such as a sirocco fan is provided inside.

This blower device 35 is electrically connected to the control board 19. The other configurations are the same as those of the first embodiment.

Therefore, according to the configuration of the second embodiment, when the temperature of the hot water in the container 1 rises and 4+11 is detected, the blower 3
We will go to 5th. The hot water in the container 1 is supplied to the blower 1135.
The cold air blown into the upper space through all of the air pipes 36 rapidly cools the room to below 100°C. The air bubbles in the bath water liquefy as the water temperature drops, and most of them disappear. Other operations are the same as in the first embodiment.

Effects of the Invention As described above, according to the present invention, when the temperature of the hot water in the container rises and boils, the water supply device and the ventilation device operate in conjunction with the boiling, so that the bubbles in the vortex are not supersaturated. It is possible to provide an electric water heater in which most of the discharge amount disappears, and the discharge amount does not decrease during boiling 1 and immediately after boiling. In addition, since a centrifugal pump rotation speed detection means is provided, depending on the combination with the water supply device and air blower device, it is possible to detect
Even immediately after 1 m, the amount of hot water corresponding to the rotational speed of the centrifugal pump can be stably obtained, no different from when it is hot.

[Brief explanation of drawings]

Figures 1 to 4 show a first embodiment of the present invention, in which Figure 1 is an overall sectional view of an electric water heater, Figure 2 is a sectional view of a centrifugal pump, and Figure 3 is a front view of a rotating plate. Figure 4 shows the relationship between hot water temperature and energization time to the water supply device? 5 is an overall sectional view of an electric water heater showing a second embodiment of the present invention, FIG. 6 is a sectional view of a conventional liquid pump, and FIG. 7 is a front view of the same. 1... Container, 2... Body, 3... Body 8.
... Lid body, 9 ... Steam passage, 12 ... Water pipe, 13
...Centrifugal pump, 14...Circulation 1st section flow path, 15...
Water supply device, 17...Discharge port, 18...Se:/t
-, 22...Motor, 30...1m turntable, 31.
...Convex portion, 32...Rotation speed detection means, 35...Blower device, 36...Blower pipe. Figure 1 Agent Yoshihiro Shikamoto Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] 1. A cylindrical container with a bottom, a lid that opens and closes the upper end opening of the container, and a steam passageway that communicates the inside of the container with the outside of the main body;
a heating element that heats the liquid contained in the container; a centrifugal pump that communicates with the container and a discharge port that opens to the outside of the main body via a water conduit; and a container that communicates with a circulation channel that communicates with the upper part of the container. An electric water heater equipped with a water supply device that is linked to the boiling of the liquid inside the water heater. 2. The electric water heater according to claim 1, further comprising means for detecting the rotation speed of the centrifugal pump. 3. A cylindrical container with a bottom, a lid that opens and closes the upper end opening of the container, and a steam passageway that communicates the inside of the container with the outside of the main body;
a heating element that heats the liquid contained in the container; a centrifugal pump that communicates with the container and a discharge port opening to the outside of the main body via a water conduit; and a centrifugal pump that is connected to the boiling of the liquid in the container and that An electric water heater equipped with a blower device that blows air into the space. 4. The electric water heater according to claim 3, further comprising means for detecting the rotational speed of the centrifugal pump.