JPH0621401Y2 - Electric hot water storage container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric hot water storage container capable of boiling water.

(Prior Art) This kind of electric hot water storage container is widely used to store hot water for beverage such as making coffee or tea.

By the way, the electric hot water storage container stores tap water in most cases, keeps it warm at a predetermined temperature after boiling it, and if necessary, either keep it in that warm state or re-boil it before pouring it for use. There is.

(Problems to be solved by the invention) The first boiling or re-boiling not only adapts the liquid temperature to the intended use, but also helps sterilization and odor emission. However, chlorine compounds due to chlorine contained in tap water, particularly harmful substances such as trihalomethane, still remain, and it is desired to sufficiently remove them.

On the other hand, Japanese Utility Model Publication No. 62-67528 and Japanese Utility Model Publication 59
Japanese Patent Publication No. 37138 discloses an electric water heater that solves this problem.

The first one is for energizing water in a boiling state for a predetermined time under the control of a microcomputer (hereinafter, referred to as a microcomputer), and the second one is for stopping energizing the heater when a predetermined temperature is reached. The non-microcomputer type heater energization control circuit is provided with a delay circuit that delays the input of the temperature signal into the comparison circuit that detects a predetermined temperature for switching from the boiling state to the heat retaining state. The boiling is continued for the amount that delays the time when is turned off.

However, adopting a microcomputer circuit like the first one requires complicated temperature control. Even if it is a non-microcomputer circuit like the second one, if a delay circuit that delays the input of an electric signal is used in addition to the comparison circuit, the circuit configuration is also complicated.

Therefore, an object of the present invention is to provide an electric hot water storage container capable of removing boiling water by simply continuing boiling for a predetermined period of time as needed by simply switching and using sensors having different detection temperatures. Is.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention comprises a heater for heating an internal solution, and a control means for controlling energization of the heater between a boiling state and a heat retaining state, In this control means,
A normal temperature sensor that detects the boiling of the internal solution based on the vapor temperature and is installed in the vapor vent passage that releases the vapor generated from the internal solution to the outside, and a high temperature sensor that detects at a temperature higher than the detection temperature of this ordinary temperature sensor. And a switching means for selecting and connecting the normal temperature sensor and the high temperature sensor for switching connection, and when either one of the sensors selectively connected by the switching means detects boiling, the boiling state is maintained. It is characterized by being switched to.

(Operation) In the above configuration of the present invention, the switching means selectively switches the normal temperature sensor and the high temperature sensor, which have different detection temperatures, to the control means for controlling the energization of the heater to the boiling state and the heat retaining state. It can be connected, the normal temperature sensor detects the steam temperature at the start of boiling so that the control means changes the energization control from the boiling state to the heat retaining state, so that the internal solution is synchronized with boiling. The energization control switches to the heat retention state, but the high temperature sensor detects the steam temperature that is higher than at the start of boiling and the control means changes the electricity control from the boiling state to the heat retention state, Since the boiling state will continue for a predetermined time until a higher steam temperature is detected than at the start of boiling, remove the chlorine in the internal solution sufficiently in the boiling continuous state during this predetermined time. After a lapse of a predetermined time, it is possible to switch to a heat retaining state and keep the solution in the boiling solution after removing the scaly.

The microcomputer for this switching can be switched from the boiling state to the heat retention state in each operation of boiling non-continuation and boiling continuation by switching between the normal temperature sensor and the high temperature sensor with different detection temperatures. A complicated temperature control by a circuit is not required, and the boiling state can be maintained for a predetermined time by simple control by a non-microcomputer circuit. As a result, descaling is not performed by a microcomputer circuit and complicated signal control is possible. The descaling can be performed with a simple configuration without using a circuit.

Also, since the normal temperature sensor and the high temperature sensor each use the steam temperature at the time of boiling of the internal solution to detect this steam temperature, the process of switching from the boiling state to the heat retaining state is actually performed. It can be accurately achieved by correctly responding to the boiling state and the continuous boiling state.

(Embodiment) An embodiment of the present invention shown in FIGS. 1 to 7 will be described.

In this embodiment, as shown in FIG. 1, the heater 1 is attached to the lower surface of the bottom of the inner container 2, and the heater driving circuit shown in FIG.
Through 34, energization is controlled between a boiling state and a heat retaining state so that the content liquid can be heated at a proper time and in a boiling state or a proper temperature to keep the temperature. Reference numeral 35 is a hot water thermostat attached to the bottom surface of the bottom of the inner container 2 through a through hole in the center of the heater 1 having a donut shape, and 38 is a thermal fuse.

The inner container 2 is housed and held in the outer case 3 to form a body 4. The mouth of the inner container 2 is connected to the upper end of the outer case 3 by a shoulder member 5 made of synthetic resin, and an outer lid 7 is pivotally attached to a bearing 9 at the rear of the shoulder member 5 by a shaft 6 so as to be openable, closable and detachable. . An inner lid 8 provided on the mouth of the inner container 2 is attached to the lower surface of the outer lid 7 and is opened and closed integrally with the outer lid 7.

Inside the outer lid 7, a bellows pump 11 which is pushed by an upper surface pressing plate 10 of the outer lid 7 is provided, and the inner container 2 is provided through an air supply passage 13 provided between the inner lid 8 and the bellows pump bottom plate 12. Pressurized air is sent inside to pressurize the content liquid. An outer lid 7 is provided in the air supply passage 13 through a branch hole 14.
Is provided with a steam vent passage 15 which escapes to the upper surface of the inner container 2 so that steam generated during heat retention and boiling by the heater 1 is released to the outside to prevent abnormal pressure rise in the inner container 2.

A lead-out path 17 for guiding the pressurized content liquid to the upper outside of the inner container 2 is provided by connecting the base end to the bottom of the inner container 2 so that the content liquid in the inner container 2 always flows in and is the same. Keeping the level. A synthetic resin elbow 16 is connected to the upper end of the lead-out path 17. The elbow 16 is connected to an inverted U-shaped tube 18 fixed to the back side of the beak-shaped portion 5a of the shoulder member 5 which extends to one side like a beak. The inverted U-shaped tube 18 has a built-in water shutoff valve 36 at the time of fall just above the connection with the elbow 16, and the tip of the inverted U-shaped tube 18 is a downward discharge port 19.

A pipe cover 20 surrounding the beak-shaped portion 5a is provided under the beak-shaped portion 5a of the body 4, and is fitted to the beak-shaped portion 5a and the outer case 3 of the body 4. A liquid injection guide tube 21 is removably attached to the bottom of the pipe cover 20 from below.

The rising portion of the lead-out path 17 is composed of a transparent tube 22 so that the liquid amount can be displayed by allowing it to be seen through the transparent window 24 of the resin panel 23 fitted from the upper end of the exterior case 3 to the front portion.

At the rear part of the shoulder member 5, two kinds of steam sensors 30 and 31 that detect the end of boiling of the content liquid by the steam temperature and turn off are put in one sensor case 32 and face the steam vent passage 15. ing. The steam sensor 30 is a normal temperature sensor that ends the boiling by detecting the steam temperature at the start of boiling in the normal boiling state, whereas the steam sensor 31 is the normal boiling continued for a predetermined time and further heated. It is a high temperature sensor that detects a higher vapor temperature than the case and ends boiling. Both sensors 30 and 31 can achieve descaling of the content liquid with a difference in detected temperature of several degrees.

As shown in FIGS. 2 (a) and 2 (b), both sensors 30 and 31 are sandwiched between three holders 33 made of synthetic resin, and are housed and fixed in the case 32 by an adhesive or force fitting. It is connected by a line 39 to the heater drive circuit 34 shown in FIG.

3 and 4 show the steel sensors 30 and 31 in the case 32.
The modification which is accommodated and fixed inside is shown. In this modification, one steam sensor is insert-molded in one holder 33 and two steam sensors are accommodated in the case 32 by using an adhesive or the like.

An operation panel 25 shown in FIG. 5 is provided on the front surface of the pipe cover 20. The operation panel 25 is provided with boiling and heat-retaining display LEDs 26 and 27, a reboil key 28, and a changeover switch 29 for switching between normal boiling and descaling.

The heater 1 is divided into a heat retaining heater 1a and a boiling water heater 1b, which are connected to a drive circuit 34 shown in FIG. In the drive circuit 34, when the changeover switch 29 is normally set to the boiling side, the sensor 30 is connected, and when it is set to the descaling side, the sensor 31 is connected.

In this drive circuit 34, 37 is a relay having an accident holding contact 37a for keeping the circuit 34 in a boiling state, either of the sensors 30, 31 is turned on, or the reboil key 28 and the content liquid are
It is operated by turning on any of the water heating thermostats 35 that turn on at a temperature lower than 80 ° C. to close the contact 37a.

As a result, the circuit drive 34 is in a boiling state in which the heater 1b is turned on in addition to the warming heater 1a. Then reboil key 28
Turns off immediately, and the content of the thermostat 38 is 80
When it reaches ℃, it is heated and turned off during the process. However, the relay 37 is in the operating state and keeps the boiling state until it is released by turning off the sensors 30 and 31 to which the self-holding by the contact 37a is connected. When the connected sensor 30 or 31 is turned off, the relay 37 is turned off and the contact 37a is turned off, so that the heater 1b is turned off and the heater 1b is returned to the heat retention state.

Therefore, when the sensor 30 is connected, it is normally turned off at the initial steam temperature of boiling, and the boiling state is released.
Normally, it is switched to the heat retention state by the end of boiling.

Further, when the sensor 31 is connected, since it is turned off at the steam temperature when boiling continues for a predetermined time after reaching the normal boiling and the boiling state is released, the temperature is switched to the heat retention state after the normal boiling continues for the predetermined time. Then, the descaling operation is performed while boiling continues.

The temperature change of the content liquid in this case is shown in FIG. FIG. 7 (a) shows the case where normal boiling is set by the changeover switch 29, and FIG. 7 (b) shows the changeover switch 29.
Shows the case of setting to remove scaly. When it is set on the descaling side, even if the content liquid reaches the boiling point, the boiling is continued for a predetermined time, and during that time, the emission of chlorine compounds and the like in the content liquid can be promoted. Exhibits so-called descaling effect.

Note that the descaling is automatically performed even during re-boiling, but only descaling during re-boiling may be set manually. In that case, as shown by the phantom line in Fig. 7 (b), normal boiling Is done.

In short, in the present embodiment, the drive circuit 34 as a control means for controlling the energization of the water heater 1b between the water heating state and the heat retention state.
On the other hand, the steam sensor 30 for detecting the normal temperature and the steam sensor 31 for detecting the high temperature, which have different detection temperatures, can be selectively switched and connected by the changeover switch 29 as a switching means, and the steam sensor 30 starts boiling. The drive circuit 34 changes the energization control from the boiling state to the heat retaining state by detecting the steam temperature at the time, so that the energization control switches to the heat retaining state in synchronization with the boiling of the inner solution,
Since the steam sensor 31 detects the vapor temperature that has become higher than that at the start of boiling, the drive circuit 34 changes the energization control from the boiling state to the heat retention state, so that the internal solution has a higher vapor temperature than at the start of boiling. Since the boiling state is continued for a predetermined time until it is detected, the chlorine in the inner solution can be sufficiently removed in the boiling continuation state for this predetermined time, and the heat insulation state is switched to after the predetermined time elapses. It is possible to keep the solution in the boiling temperature after removing the descaling.

Therefore, by switching each of the steam sensors 30 and 31 with different detection temperatures, it is possible to switch from the boiling state to the heat retention state in each operation of boiling non-continuation and boiling continuation,
It is possible to continue the boiling state for a predetermined time by simple control with a non-microcomputer circuit without requiring complicated temperature control by the microcomputer circuit for this switching, and as a result, removal of scaly by a microcomputer circuit, Further, descaling can be performed with a simple configuration without using a complicated signal control circuit.

In addition, since each of the steam sensors 30 and 31 uses the vapor temperature of the boiling path of the internal solution to detect this vapor temperature, the switching process from the boiling state to the heat retaining state is performed in the actual boiling state and boiling state. It is possible to respond correctly to continuation and achieve it accurately.

(Effects of the Invention) According to the present invention, by switching between the normal temperature sensor and the high temperature sensor, which have different detection temperatures, from the boiling state to the heat retaining state in each operation of non-continuation of boiling and continuation of boiling Since the switching can be performed, complicated temperature control by the microcomputer circuit for this switching is not required, and the boiling state can be continued for a predetermined time by simple control by the non-microcomputer circuit. It is possible to perform descaling with a simple configuration that does not depend on a microcomputer circuit and does not use a complicated signal control circuit.

Also, since the normal temperature sensor and the high temperature sensor each use the steam temperature at the time of boiling of the internal solution to detect this steam temperature, the process of switching from the boiling state to the heat retaining state is performed by the actual boiling It can be achieved accurately by correctly responding to the state and continued boiling.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention, and FIG.
2A is an exploded perspective view of a holder and a steam sensor, FIG. 3 is a perspective view showing a modified example of the main part, and FIG. FIG. 5 is a perspective view showing an essential part of the first embodiment, FIG. 6 is a control circuit diagram,
FIG. 7 is a graph showing the temperature change of the content liquid in the case of normal boiling and the case of removing scaly water. 1a …… Insulation heater 1b …… Boiler heater 29 …… Changeover switch 30 …… Steam sensor 31 …… Steam sensor 34 …… Drive circuit 35 …… Boiler thermostat

Claims (1)

[Scope of utility model registration request] 1. A steam vent passage through which a heater for heating an internal solution and a control means for controlling energization of the heater between a boiling state and a heat-retaining state are provided to allow the vapor generated from the internal solution to escape to the outside. A normal temperature sensor that is installed in the unit and detects the boiling of the internal solution based on the steam temperature, a high temperature sensor that detects a temperature higher than the detection temperature of the normal temperature sensor, and the normal temperature sensor and the high temperature sensor An electric hot water storage container is provided with switching means for switching and connecting, and when one of the sensors selectively connected by this switching means detects boiling, the boiling water state is switched to the heat retention state. .