JPH08131333A - Boiling type electric hot water storage container - Google Patents

Abstract

PURPOSE: To ensure a sufficient steam discharge time during a period from the start of the generation of steam to the detection of boiling by selecting the attaching position of a boiling detection sensor. CONSTITUTION: In a boiling type electric hot water storage container equipped with an inner container 4 heated by an electric heater 11, a boiling detection sensor 43 is provided on the outer surface of the peripheral wall of the inner container 4 in a close contact state at the position above a water filling state display part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling electric hot water storage container, and more particularly to a structure for mounting a boiling detection sensor in a boiling electric hot water storage container.

[0002]

2. Description of the Related Art Generally, in a boiling type electric hot water storage container, the water contained in the inner container is heated and boiled by an electric heater, and the hot water is stored in a warm state after the boiling is detected. Therefore, in order to switch the electric heater from boiling heating to heat retention, a boiling detection sensor that accurately detects the boiling state of water in the inner container is required.

In a conventionally known boiling type electric hot water storage container, a boiling detection sensor is provided in the middle of the steam discharge passage to detect the temperature of the steam discharged during boiling (for example, Japanese Utility Model Laid-Open No. 3-8206). reference).

[0004]

By the way, a thermistor is usually used as the temperature sensing element of the boiling detection sensor. In that case, if the steam temperature is directly detected, the temperature of the hot water will be as shown by the chain line Y in FIG. X is the boiling point (that is, 100 ° C)
The resistance value of the thermistor sharply rises from the steam generation start point t ₀ reaching to the boiling point to the boiling detection point t ₁ . Therefore, the time (t ₁ -t ₀₎ from the steam generation start point to the boiling detection point is very short. In this case, when the electric heater is switched to heat retention at the same time as the boiling detection by the boiling detection sensor, the time (t ₁ -t ₀ ) becomes the steam discharge time, and thus descaling or trihalomethane removal performed during that time becomes insufficient. There is a risk. Therefore, in order to secure the vapor discharge time required for descaling or trihalomethane removal,
Conventionally, a method of delaying the heat retention switching control of the electric heater by a timer for a predetermined time in response to the boiling detection by the boiling detection sensor has been performed. In other words, the heat retention switching control of the electric heater is complicated because of descaling or removal of trihalomethane.

The present invention has been made to solve the above problems, and by selecting the mounting position of the boiling detection sensor, a sufficient steam discharge time is secured from the start of steam generation to the boiling detection. The purpose is to get it.

[0006]

In the basic constitution of the present invention, as means for solving the above-mentioned problems, in a boiling type electric hot water storage container provided with an inner container heated by an electric heater, an outer surface of a peripheral wall of the inner container is provided. In addition, a boiling detection sensor is attached in a close contact state above the full water display portion.

The basic configuration of the present invention has the following preferred embodiments.

That is, the boiling detection sensor is supported on the shoulder member, to which the upper end of the inner container is attached, via a mounting bracket without requiring a special mounting member (that is, above the full water display portion). It is preferable in that a boiling detection sensor can be attached to the position).

[0009]

In the basic configuration of the present invention, the following actions can be obtained by the above means.

That is, since the temperature detection by the boiling detection sensor is performed on the outer surface of the peripheral wall above the full water display portion in the inner container, the actual temperature of the hot water changes due to the presence of the temperature resistance from the hot water in the inner container to the boiling detection sensor. Since the followability of the detected temperature with respect to is slow, it takes a predetermined time from the start of steam generation (that is, when the hot water temperature reaches the boiling point) to reach the boiling detection temperature. The predetermined time can be set as descaling time or trihalomethane removal time.

In the preferred embodiment of the present invention, the following effects are obtained.

That is, without preparing a special mounting member,
By using the shoulder member also as the mounting member, the boiling detection sensor is mounted at a predetermined position (that is, a position above the full water display portion).

[0013]

According to the present invention, the temperature detection by the boiling detection sensor is performed on the outer surface of the peripheral wall above the full water display portion in the inner container, so that the temperature resistance from the hot water in the inner container to the boiling detection sensor is reduced. Due to the existence, the tracking of the detected temperature with respect to the actual change in the hot water temperature is slowed down.Therefore, the temperature of the outer surface of the peripheral wall must reach the boiling detection temperature at the start of steam generation (i.e. Since a predetermined time is required from the point of time), the predetermined time can be set as a descaling time or a trihalomethane removal time, and there is an excellent effect that descaling or trihalomethane removal can be achieved at the same time as boiling detection.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 to 7 show a boiling type electric hot water storage container according to Embodiment 1 of the present invention.

As shown in FIG. 1 and FIG. 2, the boiling type electric hot water storage container of this embodiment is provided with a synthetic resin shoulder member 3 on the upper part of a metal outer case 2 and a stainless steel inside the outer case 2. It comprises a container body 1 accommodating an inner container 4 made of a product, a lid 5 for covering the upper part of the container body 1, and a series of liquid pouring passages 6.

The inner container 4 has a cylindrical shape with a bottom, and a flange portion 4a formed on the upper end of the inner container 4 is suspended on the inner peripheral edge portion 3a of the shoulder member 3 to form the outer case 2.
Supported within. A full water display portion 8 is formed on the upper portion of the peripheral wall 4b of the inner container 4 so that the user can recognize the maximum amount of water contained in the inner container 4. The full water display portion 8 is formed by partially recessing a predetermined position of the inner container 4 inward. A bottom member 7 made of synthetic resin is in contact with the lower end of the outer case 2, and the bottom member 7 and the inner container 4 are connected to each other via a connecting fitting (not shown). As a result, the outer case 2, the inner container 4, and the bottom member 7 are integrated with each other.

The lower opening 7a of the bottom member 7 is closed by a bottom lid 9, and a rotary seat body 10 is rotatably supported on the outer peripheral portion of the lower surface of the bottom lid 9. This allows the container body 1 to be lightly rotated on the rotary seat body 10 when the container body 1 is stationary.

An electric heater 11 is in contact with the lower surface of the bottom of the inner container 4, and below the electric heater 11,
The heat shield plate 12 is attached to the bottom of the inner container 4 in a fixed state. And the electric heater 11
Are held in a state of being pressed against the bottom of the inner container 4 by a spring plate 13 provided between the heat shield plate 12 and the heat shield plate 12. The electric heater 11 is composed of a boiling water heater 11A and a heat retention heater 11B.
It is supposed to be switched to B.

A through hole 14 is formed in the center of the electric heater 11.
A temperature sensor 15 for detecting the temperature of the inner container 4 is arranged in the through hole 14 so as to be separated by a heat shield wall 16. The temperature sensor 15 includes an inner container 4
The temperature is detected and an electric signal is output as temperature information for heat retention control by the circuit board 18 described later.

A circuit housing box 17 is integrally formed in the bottom member 7 by opening downward, and a circuit board 18 is housed in the circuit housing box 17. The lower end opening of the circuit housing box 17 is covered with a cover 19. As a result, it is possible to prevent water from leaking from above or flooding from below.

The circuit board 19 incorporates various elements forming a microcomputer, and outputs signals from the operation panel section 20 provided on the upper surface of the beak portion 3b projecting forward of the shoulder member 3, Upon receiving various detection signals from the temperature sensor 16, a boiling detection sensor described later, and the like, the operation control of boiling and heat retention is performed, and the operation display and display control by timer setting are performed.

The lid 5 has a hinge pin 2 with respect to a partially open type bearing 21 formed integrally with the rear portion of the shoulder member 3.
It is rotatably and detachably pivotally supported via 2. That is, the lid 5 can be opened and closed with the hinge pin 22 as a fulcrum, and can be removed by detaching the hinge pin 22 from the bearing 21 at a predetermined opening angle. On the other hand, on the free end side of the lid body 5, a lock device 23 for holding the closed state of the lid body 5 is provided.

The lid 5 is made of a synthetic resin integrally molded product, and the upper plate 5 is welded to each other at its outer peripheral edge.
a and a lower plate 5b, and a metal inner lid 24 for covering the upper opening of the inner container 4 when the lid 5 is closed is fitted from below onto the lower surface of the lower plate 5b. It is attached by 25. At the outer peripheral edge of the inner lid 24, there is provided a seal packing 26 which is in contact with the flange portion 4a of the inner container 4 to maintain an airtight state when the lid body 5 is closed.

Between the lower plate 5b and the inner lid 24,
A steam discharge passage 28 for discharging the steam S generated in the inner container 4 to the outside is formed by the passage forming member 27 sandwiched between the lower plate 5a and the inner lid 24. The vapor discharge passage 28 includes a first passage 28a formed between the passage forming member 27 and the inner lid 24, and a second passage formed between the passage forming member 27 and the lower plate 5b. 28b and a third passage 28d formed between the lower plate 5b and the upper plate 5a and communicating with the second passage 28b through a communicating portion 31.
And the first passage 28a includes the inner lid 24
Is communicated with the inside of the inner container 4 through an inlet opening 29 formed in the first passage 28a and the second passage 28b is communicated with a passage hole 30 formed in the central portion of the passage forming member 27. The third passage 28c communicates with the outside through an outlet opening 32 formed in the upper surface of the lid 5 on the rear side.

Further, a valve chamber surrounded by a cylindrical wall 33 which is integrally provided vertically from the edge portion of the through hole 30 and has a vapor passage hole 36 between the passage forming member 27 and the inner lid 24. Three
4 is formed in the valve chamber 34. A fall stop valve 35 is provided in the valve chamber 34 to close the through hole 30 by its own weight and the flowing pressure of the outflowing liquid when the hot water container falls.

The first in the steam discharge passage 28
The passages 28a and the second passages 28b have a relatively large horizontal expanse, so that when the hot water storage container falls, the hot water in the inner container 4 is discharged before the fall stop valve 35 is activated. Even if it flows into the passage 28, it takes some time to be temporarily stored in the first passage 28a or the second passage 28b and flow out from the outlet opening 32 to the outside. Therefore, the hot water storage container can be raised before the outflow of the hot water without panicking.

The liquid pouring passage 6 is formed as a series of passages passing from the bottom of the inner container 4 to the front of the inner container 4 and facing the pouring guide 37 formed in the beak portion 3b of the shoulder member 3. The tip pouring port 38 faces the inside of the pouring guide 37 with a gap open to the atmosphere. As a result, the liquid to be poured out is once released into the atmosphere and then flows into the pouring guide 37 so that the liquid can be gently poured.

An electric pump 39 for pumping up the hot water in the inner container 4 is provided below the bottom of the inner container 4 in the liquid pouring passage 7. In the middle of the liquid pouring passage 6 (that is, immediately before the pouring outlet 38).
Is provided with a fall stop water valve 40, and when the hot water storage container falls, the fall stop water valve 40 is closed by receiving its own weight or the outflow pressure of the outflowing liquid, and is closed to the outside via the liquid pouring passage 6. Liquid outflow is to be prevented. Further, a transparent pipe 41 is provided in the middle of the liquid pouring passage 6 (that is, a portion located in front of the inner container 4), and the liquid level of the liquid flowing into the transparent pipe 41 is equal to that of the outer case 2. It can be seen from the outside through a liquid volume display window 42 provided on the front surface.

A boiling detection sensor 43 is attached in close contact with the outer surface of the peripheral wall 4b of the inner container 4 above the full water display portion 8. The boiling detection sensor 43, as shown in FIGS.
Holder 44 pressed by (wall thickness: 0.2 mm)
A bead-type thermistor 45, which is a temperature-sensitive element, is fixed in the sensor holding portion 44a of the above with a filling liquid, and the holder 44 is attached to the peripheral wall 3c of the shoulder member 3 which is an attachment counterpart member. A substantially L-shaped mounting bracket 46 is integrally formed. Moreover, the holder 4 is fixed to the fixing portion 46a of the mounting bracket 46.
4 has a slight inclination angle α (for example, α = 5 to 10 °) (see FIG. 4).

The boiling detection sensor 43 is mounted on the mounting bracket 46 with respect to a screw hole 47 which is formed in advance at a predetermined position of the peripheral wall 3c of the shoulder member 3 (that is, a position above the full water display portion 8 of the inner container 4). Is fixed by screws 48, but at that time, the holder 44 is brought into close contact with the outer surface of the peripheral wall 4b of the inner container 4 due to the existence of the inclination angle α. Reference numeral 49 is a lead wire.

Here, it is important that the mounting position of the boiling detection sensor 43 is located above the full water display portion 8. When the boiling detection sensor 43 is mounted below the full water display portion 8, the hot water temperature is directly detected. Boiling detection sensor 4
It becomes impossible to secure the delay of the followability with respect to the change in the detected temperature due to the hot water temperature.

In the present embodiment, the operation panel section 20 is, as shown in FIGS. 5 and 6, a side type hot water supply micro switch 54 for controlling ON / OFF of the pumping pump 39, and a boiling state. And a switch substrate 50 including indicator lights 55 and 56 for displaying a heat retention state, a re-boiling micro switch 57, and the like, and the micro switch 5
Switch operation unit 5 for ON / OFF operation of 4, 57
The switch box 51 is provided with 8, 59 and the indicator light windows 60, 61, and a sheet 52 covering the upper surface of the switch box 51. The switch board 50 and the switch box 51 are provided with the switch box 51 between them. Operation part 5
A lock stopper ring 53 for restricting the operation of 7 is rotatably interposed.

The lock stopper ring 53 is formed on a ring body 63 rotatably fitted in a circular hole 62 formed around the switch operating portion 58, and on the inner peripheral side of the ring body 63. The lock piece 64 is inserted below the switch operating portion 58 as the ring body 63 rotates and restricts the downward operation of the switch operating portion 58.
And a fan-shaped operation piece 65 that projects horizontally on the outer periphery of the ring body 63. Reference numeral 66 is an operation knob provided on the upper surface of the operation piece 65 so as to face a guide groove 79 formed in the switch box 51.

The seat 52 is provided with display parts 67 to 70 corresponding to the switch operation parts 58 and 59 and the display light windows 60 and 61, respectively, and an arcuate groove in which the operation knob 66 is exposed. 71 is formed.

With the above construction, when the lock stopper ring 53 is rotated in the direction of arrow M,
The lock piece 64 of the lock stopper ring 53 is pushed below the switch operating portion 58,
The pressing operation of 8 becomes impossible, and the hot water supply micro switch 54 cannot be turned on. That is, the hot water supply micro switch 54 is locked. In addition,
The lock is released when the lock stopper ring 53 is returned.

Electrical elements of the heating system in the boiling type electric hot water storage container of this embodiment (that is, the heater for boiling water 11A, the heater for keeping warm 11B, the temperature sensor 15, the boiling detection sensor 43, the boiling indicator lamp 55, the warming indicator lamp 56). The re-boiling microswitch 57) is connected as shown in FIG. In FIG. 7, reference numeral 72 is a reboiling relay, 73 is a relay contact of the reboiling relay 72, and 74 is a boiling indicator lamp 5
5 is a protection resistor for protecting the heat insulating indicator lamp 56, 75 is a protection resistor for protecting the heat retention indicator lamp 56, 76 is a thermal fuse, and 77 is a bimetal breaker.

The boiling control in the boiling type electric hot water storage container configured as described above will be described below with reference to the flowchart shown in FIG.

[0039] When the power of the inner container 4 in a state where water is accommodated is turned on, at step S ₁ is inputted detected temperature T ₁ of by the temperature sensor 15, and the detected temperatures T ₁ in step S ₂ a 1 Comparison with the set temperature Ts ₁ is made. Here, the first set temperature Ts ₁ is the minimum heat retention temperature (Ts ₁ = 80 ° C. in this embodiment). Then, when it is determined that T ₁ ≦ Ts ₁ in step S ₂ , the water heating mode by the heater 11A for water heating is started in step S ₃ . In step S ₂ , T ₁
When it is determined that> Ts ₁ , it means that hot water having a temperature higher than the first set temperature Ts ₁ (= 80 ° C.) is stored in the inner container 4, so there is no need to boil water, and as described below. Insulation mode is started (that is, step S
Go to ₆ ).

[0040] When the kettle mode is started, a detection temperature T ₂ of from boiling detection sensor 43 is input in step S _4, the detected temperature T ₂ and the second set temperature Ts ₂ (i.e. in step S _5, boiled The detected temperature) is compared. If it is determined that T ₂ ≧ Ts _2, water heating heater 11A in step S ₆ is shifted to the heat insulating mode is switched to the heater 11B for insulation heater.

By the way, the boiling detection sensor 4 of this embodiment
In the case of 3, as shown by the dotted line Z in FIG. 9, the presence of temperature resistance from the hot water in the inner container 4 to the boiling detection sensor 43 delays the followability of the detected temperature T ₂ with respect to the actual change of the hot water temperature X. Therefore, the hot water temperature X is the time taken from the time t ₀ when the steam begins generated reached the boiling detection point to time t ₂ the detected temperature T ₂ of the sensor 43 reaches the boiling detection point (t ₂ -
(t ₀ ) can be secured for a long time (according to the experiment, 3 to 5 minutes).
Accordingly, it becomes that the time (t ₂ -t ₀₎ can be secured as a vapor discharge time, it become possible without chlorine and trihalomethane removed during this time.

While there is a demand to reboil the hot water while the heat retention mode is continuing, in this case, the reboil switch operating section 59 is turned on. Determination of whether the ON operation there is made at step S _7, when a positive determination is made, the detection temperature T ₂ from boiling detection sensor 43 in step S ₈ is inputted, the step S ₉
At the detected temperature T ₂ and the second set temperature Ts ₂ (= 100
℃) is made. Here, when it is determined that T ₂ ≦ Ts ₂ , the process returns to step S ₃ and the heat retention heater 11
The heater is switched from B to the water heater 11A to shift to the water heating mode, but if it is determined that T ₂ > Ts ₂ , then the process returns to step S ₆ and the heat retention mode is continued. Also in this case, the vapor discharge time (t ₂ −t ₀ ) required for descaling and trihalomethane removal in the water heating mode is secured by the same process as described above.

Even when a negative determination is made in step S ₇ (that is, when reboiling is not requested), there is a case where the amount of hot water in the inner container 4 is reduced and water is replenished. In that case, the temperature of the hot water in the inner container 4 decreases,
In step S ₁₀ , the temperature sensor 15 detects the detected temperature T.
₁ is input, the detection temperatures T ₁ in step S ₁₁ (=
(80 ° C.) and the first set temperature Ts ₁ are compared. Here, when it is determined that T ₁ ≦ Ts ₁ , step S ₃
Return to the warming heater 11B to the water heater 11
It switches to A and shifts to the water heating mode, but T ₁
If it is determined that> Ts ₁ , the process returns to step S ₆ and the heat retention mode is continued. Also in this case, the vapor discharge time (T ₂ −T ₀ ) required for descaling and trihalomethane removal in the water heating mode in the same manner as described above.
Is secured.

Embodiment 2 FIGS. 10 and 11 show a boiling detection sensor mounting structure in a boiling type electric hot water storage container according to Embodiment 2 of the present invention.

In the case of this embodiment, the holder 44 of the boiling detection sensor 43 is detachably locked to the mounting bracket 46 fixed to the outer surface of the peripheral wall 3c of the shoulder member 3 with the screw 78. There is.

That is, an annular locking portion 44b is integrally formed at the upper end of the holder 44, while the mounting bracket 46 is fixed to the shoulder member 3 with a fixing piece 46a and the fixing piece 46a. An elastic locking piece 46b integrally formed at the center of the lower end of the portion 46a and guide pieces 46c, 46c extending from both sides of the lower end of the fixing piece 46a so as to sandwich the elastic locking piece 46b. The holder 44 is mounted by engaging the locking portion 44b of the holder 44 with the elastic locking piece 46a. At this time, the guide pieces 46c,
46c serves as an insertion guide for the locking portion 44b and has a function of preventing lateral deviation. In addition, holder 4
When 4 is forcibly pulled downward, the engagement between the locking portion 44b and the elastic locking piece 46b is released, and the holder 44 is removed. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

The invention of the present application is not limited to the configuration of each of the above-described embodiments, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper portion of a boiling type electric hot water storage container according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the lower portion of the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a mounting structure of the boiling detection sensor in the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a mounting structure of a boiling detection sensor in the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view of an operation panel portion of the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 6 is a plan view showing a main part of an operation panel portion in the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 7 is a wiring diagram of electric elements of a heating system in the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing a mode of boiling control in the boiling type electric hot water storage container according to the first embodiment of the present invention.

FIG. 9: Temporal change of hot water temperature in a boiling type electric hot water storage container, conventional boiling detection sensor (ie, steam temperature detection type)
5 is a time chart showing changes in the detected temperature with time and changes in the detected temperature with the boiling detection sensor (inner container upper temperature detection type) of the first embodiment.

FIG. 10 is an exploded perspective view showing the mounting structure of the boiling detection sensor in the boiling type electric hot water storage container according to the second embodiment of the present invention.

FIG. 11 is a sectional view showing a mounting structure of a boiling detection sensor in a boiling type electric hot water storage container according to a second embodiment of the present invention.

[Explanation of symbols]

1 is a container body, 3 is a shoulder member, 3c is a peripheral wall, 4 is an inner container,
4 c is a peripheral wall, 8 is a full water display portion, 11 is an electric heater, 43
Is a boiling detection sensor, and 46 is a mounting bracket.

Claims (2)

[Claims] 1. A boiling type electric hot water storage container provided with an inner container heated by an electric heater, wherein a boiling detection sensor is in close contact with the outer surface of the peripheral wall of the inner container and above the full water display portion. A boiling electric hot water storage container characterized by being attached. 2. The boiling type electric hot water storage container according to claim 1, wherein the boiling detection sensor is supported on a shoulder member to which the upper end of the inner container is mounted via a mounting bracket.