JP4968252B2 - Electric pot - Google Patents

Description

  The present invention relates to an electric pot, and more particularly to an emptying detection process in an electric pot.

  Conventionally, a container main body provided with an inner container for boiling water and a lid, a heating means for heating the inner container, and a temperature detection means for detecting the temperature of the inner container, the temperature detected by the temperature detection means An electric pot configured to be able to detect airing by a sudden rise in the temperature is well known (see Patent Document 1).

Japanese Utility Model Publication No. 2002-272613.

  By the way, in the case of this kind of electric pot, after performing “preliminary heating” in which heating means (comprising a boiling heater and a heat retaining heater) is energized for 10 seconds, the energization to the boiling heater is stopped, and then 20 The “main heating” by the heating means is to be performed when a second has elapsed. This “preheating” is performed in order to warm the inner container to some extent in consideration of the responsiveness of the temperature detecting means (see FIG. 8).

  And the conventional airing detection (the technique currently disclosed by the said patent document 1) was to start simultaneously with the start of heating. However, when the power is turned on while the heating means (boiling heater, heat retaining heater) and the inner container are in a high temperature state, as in the case of reuse immediately after use of the electric pot, a large amount of water is accommodated in the inner container. However, 10 seconds of the “preliminary heating” may play the role of “main heating”, causing convection of hot water, and the temperature detected by the temperature detecting means may increase rapidly. Then, there was a problem that the sudden temperature rise was erroneously detected as an empty state. When the change in the detected temperature of the temperature detecting means when the above-mentioned trouble occurs was examined, as shown in FIG. 8, a rapid temperature increase started before the “preheating” was completed, It turns out that it is misdetecting.

  In addition, in the electric pot having the above configuration, water may be added while keeping a large amount of hot water while aiming at the detection portion of the temperature detection means (that is, the inner bottom portion of the inner container) with a kettle or the like. After the temperature detected by the temperature detector decreases, when hot hot water that has been kept up until now is detected in the detector due to convection of water, the temperature detector erroneously detects that there has been a sudden rise in temperature. May be detected (see FIG. 9). When the change in the detected temperature of the temperature detecting means when the above-mentioned problem occurs was examined, as shown in FIG. 9, after about 10 to 13 seconds have elapsed after the addition of water (in other words, after the “preheating” is completed) It was found that a sudden temperature increase started and false detection of air-spreading was completed after the “preheating”.

The present invention has been made in view of the above, as in the time of reuse of immediately after use of an electric kettle, while kept warm plenty of hot water, the detection of the temperature sensing means in a kettle or the like (i.e., the contents Even when water is added with the aim of the inner bottom portion of the vessel, the object is to reliably prevent false detection of the airing detection.

In the present invention, as means for solving the above-mentioned problems, a container body provided with an inner container and a lid for boiling water, a heating means for heating the inner container, and a temperature detection means for detecting the temperature of the inner container In an electric pot configured to perform emptying detection by a sudden rise in the temperature detected by the temperature detecting means, when there is an addition of water into the inner container, after the addition of water After the convection waiting time elapses, heating by the heating means is started and the emptying detection process is performed.

  By configuring as described above, when water is added while keeping a large amount of hot water while aiming at the detection part of the temperature detection means (that is, the inner bottom part of the inner container) with a kettle or the like, the detection of the temperature detection means After the temperature drops, the hot water that has been kept in the detection unit by the convection of the water will come to the detection unit. However, as in the present invention, since the emptying detection process is started after a predetermined time corresponding to the convection waiting time when water has been added, the detected temperature of the temperature detecting means During the time zone in which the temperature rises rapidly, the air-glow detection process is not started, so that a rapid rise in the detected temperature is not erroneously detected as air-glow.

According to the present onset bright, comprising a container body having a inner container and lid for kettle, heating means for heating the inner container, and a temperature detecting means for detecting a temperature of the inner container, temperature sensing In the electric pot configured to perform the emptying detection by a sudden rise in the detection temperature by the means, when there is an addition of water into the inner container, the convection waiting time after the addition of the water is passed. It is configured to start heating by the heating means and perform the emptying detection process, and while keeping a large amount of hot water, aim at the detection part of the temperature detection means (that is, the inner bottom of the inner container) with a kettle or the like. When water is added, after the temperature detected by the temperature detector decreases, the hot water that has been kept in the detection unit due to the convection of water comes to the temperature detector, and the temperature detector rapidly increases. Misjudging, "Airborne However, the temperature detection means detects that the temperature detection means detects that the temperature of the temperature detection means is low. In the time zone in which the temperature rises rapidly, the air-blow detection process is not started, and therefore, there is an effect that a sudden rise in the detected temperature is not erroneously detected as air-blow.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, this electric pot heats the bottom of the inner container 3 and a container body 1 having a bottomed cylindrical inner container 3 and a lid 2 that are open at the top. An electric heater 4 (consisting of a boiling heater 4A and a heat retaining heater 4B) as heating means, a hot water supply passage 5 (only part of which is shown) for supplying hot water in the inner container 3 to the outside, and the hot water supply An electric hot water supply pump 6 provided in the middle of the passage 5 is provided.

  The said container main body 1 couple | bonds the synthetic resin cylindrical outer case 7 which comprises an outer surface, the said inner container 3 which comprises an inner peripheral surface, the upper part of the said outer case 7, and the upper part of the inner container 3 An annular shoulder member 8 made of synthetic resin, a bottom member 9 made of synthetic resin having a hat-shaped cross section that is fitted inside the bottom of the outer case 7 and forms the bottom surface of the outer case 7, and the shoulder member 8 The lid body 2 is supported by a hinge pin 11 that is engaged with and disengaged from a hinge receiver 10 provided on one side of the lid body 2 so as to be opened and closed and detachable.

  The bottom portion of the inner container 3 is formed in a cylindrical shape protruding slightly upward except for a predetermined width portion on the outer peripheral side, and the water heater 4 (for example, wattage on the mica plate) is formed on the lower surface side thereof. Mica heaters holding two sets of heating elements with different sizes are attached.

  On the other hand, reference numeral 12 denotes a temperature sensor that acts as a temperature detecting means for detecting the temperature of the inner container 3 (in other words, the hot water temperature T), and is composed of, for example, a thermistor.

  The lid body 2 is composed of a synthetic resin upper plate 13 and a synthetic resin lower plate 14 whose outer peripheral edges are coupled to the upper plate 13 by fitting. A hinge receiver 10 provided at the rear part of the member 8 is supported via a hinge pin 11 so as to be openable and detachable.

  Reference numeral 15 denotes a steam discharge passage of the lid body 2 that communicates with each other in a detoured state from the lower side to the upper side, and reference numeral 16 denotes an overturn stop water valve disposed in the middle of the steam discharge passage 15.

  A metal inner cover member 17 is fixed to the lower surface of the lower plate 14 in the lid 2, and the outer peripheral edge of the inner cover member 17 is attached to the inner container 3 when the lid 2 is closed. A heat-resistant rubber seal packing 18 is provided in pressure contact with the upper surface of the water supply port (upper end opening).

  In the middle of the hot water supply passage 5 and at a position below the inner container 3, a direct current type electric hot water pump 6 is provided via a hot water introducing cylinder 5 a on the inner container 3 side and a hot water inlet 6 a of the electric hot water pump 6. In this hot water supply passage 5, hot water sucked from the hot water intake port 6 a through the hot water introduction tube 5 a is discharged from the discharge port 6 b by the pumping action of the electric hot water supply pump 6, and the hot water supply passage Through a straight pipe portion (not shown) of 5, the hot water pouring outlet 5 b is led from an overturn stop water valve arrangement portion (not shown) to the outside.

  Further, in this embodiment, a first intake port 19A is provided at the upper part on the back side of the outer case 7 (ie, below the hinge receiver 10), while the upper part on the front side of the outer case 7 (ie, the lower part). The second intake port 19B is provided in a corner portion on the back side of the nose portion 1a of the container body 1 protruding forward.

  On the other hand, the top plate 9b of the bottom member 9 is provided with an exhaust port 9e, and is provided with a cooling fan (propeller fan) 20 which is located at the upper part and sucks air from the upper side and blows it downward. The cooling fan 20 houses its impeller and motor portion in a small fan casing 20a, and is securely fixed to the upper portion of the exhaust port 9e via the fan casing 20a.

  In addition, arc-shaped openings (tunnel-shaped notches) 9c, 9c are provided in the side wall portions 9a, 9a located on the left and right sides when viewed from the front side of the bottom member 9, and the exhaust port 9e The air blown downward from the container is blown outward from the left and right sides of the container body 1 (not blown in the direction in which the user is present).

  Therefore, when the cooling fan 20 is driven, outside air is introduced from the back side and the front side of the inner container 3 through the first and second intake ports 19A and 19B of the outer case 7, and then the inner container 3 The exhaust port 9e and the openings 9c, 9c on the lower side are reached while cooling the periphery of the gas, and is discharged to the outside through the exhaust port 9e and the openings 9c, 9c, so that the hot water in the inner container 3 is effectively cooled, The hot water temperature after the completion of boiling is quickly lowered.

  FIG. 4 shows a part of the upper surface structure of the container main body 1 in the electric pot. Reference numeral 21 denotes an operation panel unit provided with an operation surface of various switches described later and a display surface of a liquid crystal display unit. The operation panel 21 includes a hot water switch 22, a hot water lock release switch 23, a heat retention selection switch 24, a reboil / timer switch 25, a kitchen timer switch 26, a reboil display LED 27, a hot water lock release display LED 28, and a liquid crystal display. A portion 29 and the like are provided.

The liquid crystal display unit 29 is provided with, for example, a display unit 29a for displaying time / time / hot water temperature / operating state, a heat retention set temperature display unit 29b, a set heat retention temperature instruction mark 29c, and the like. Convenient information display is made.

  FIG. 5 is a block diagram showing a configuration of a control circuit unit in the electric pot according to the present embodiment. In addition, about the electrical element already demonstrated, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In FIG. 5, reference numeral 52 is a commercial AC power supply, and 53 is a smoothing capacitor and a power supply IC, for example, and supplies DC power to the microcomputer control unit 60, a heating control unit 54, a pump power supply unit 55, a fan power supply unit 56, and the like. A stabilizing DC power supply unit, 54 is a heating control unit for ON / OFF control of the boiling heater 4A and the heat retaining heater 4B, 55 is a pump power supply unit of the electric hot water supply pump 6, and 56 is a fan power supply unit of the cooling fan 20.

  When the boiling heater ON signal is output from the microcomputer control unit 60 to the heating control unit 54, the boiling heater 4A activates a power relay via a transistor (not shown), and the power switch is turned on correspondingly. It is to be driven by.

  Further, when the warming heater ON signal is output from the microcomputer control unit 60 to the heating control unit 54, the warming heater 4B is driven by driving a triac by turning on a transistor (not shown). ing.

  In the electric pot having the above configuration, when boiling water, the boiling heater 4A is driven to quickly heat up to a boiling state with a high heating output. Then, the boiling heater 4A is turned OFF, and then the hot water temperature is rapidly lowered to the target heat retention temperature set by the user while moving to the heat retention step and driving the cooling fan 20.

  In the heat retaining step, the actual hot water temperature (specifically, the temperature detected by the temperature sensor 12) is a high temperature heat retaining set temperature (for example, 95 ° C.) set by the heat retaining selection switch 24 and the microcomputer control unit 60 or When a temperature corresponding to a medium temperature keeping set temperature (for example, 80 ° C.) or a low temperature keeping temperature (for example, 60 ° C.) is reached, the corresponding hot water temperature is displayed on the hot water temperature display section of the liquid crystal display section 29. It has become.

  By the way, in the case of the electric pot having the above configuration, when the hot water in the inner container 3 runs out and becomes empty, the inner container 3 becomes overheated, which may cause the electric heater 4 to fail. The air blow detection was performed by the rapid rise in the detection temperature T.

  Further, in the electric pot, after performing “preliminary heating” in which the boiling heater 4A and the heat retaining heater 4B are energized for 10 seconds, the energization to the boiling heater 4A is stopped, and when both the heaters 4A, “Main heating” by 4B is to be performed. The “preheating” is performed in order to warm the inner container 3 to some extent in consideration of the responsiveness of the temperature sensor 12 (see FIG. 8).

  Then, the conventional airing detection is to be started simultaneously with the start of the “preheating”. However, when the electric heater 4 (boiling heater 4A, heat retaining heater 4B) and the inner container 3 are kept in a high temperature state as in the case of reuse immediately after the electric pot is used, a large amount of water is contained in the inner container 3. Even if it is housed, 10 seconds of the “preheating” may play the role of “main heating”, causing convection of hot water, and the temperature T detected by the temperature sensor 12 may rise rapidly. Then, there was a problem that the sudden temperature rise was erroneously detected as an empty state. When the change in the temperature detected by the temperature sensor 12 when the above-mentioned trouble occurs was examined, as shown in FIG. 8, a rapid temperature increase started before the “preheating” was completed, and the air was blown immediately after the “preheating” was completed. It turns out that it is misdetecting.

  In addition, in the electric pot having the above-described configuration, water may be added while keeping a large amount of hot water while aiming at the detection portion of the temperature sensor 12 (that is, the inner bottom portion of the inner container 3) with a kettle or the like. In this case, after the detection temperature T of the temperature sensor 12 is lowered, when hot hot water that has been kept up until now is brought to the sensor detection part by convection of water, the temperature sensor 12 erroneously determines that the temperature has rapidly increased, In some cases, it may be detected as “empty” (see FIG. 9). When the change in the detected temperature of the temperature sensor 12 when the above-mentioned trouble occurs was examined, as shown in FIG. 9, after about 10 to 13 seconds have elapsed after the addition of water (in other words, after the “preheating” is completed) It was found that a sudden temperature increase started and false detection of air-spreading was completed after the “preheating”.

Next, with reference to the flowcharts shown in FIG. 6 and FIG. 7, the emptying detection process in the electric pot according to the present embodiment will be described.
(I) Empty detection processing I (refer to the flowchart of FIG. 6)
When the boiling mode is started, energization to the heat retaining heater 4B and the boiling heater 4A is started in step S1, and it is confirmed that a predetermined time t1 (for example, 10 seconds) has passed in step S2 (in other words, “ When it is confirmed that the “preheating” has been completed), the energization to the boiling heater 4A is stopped in step S3, and the emptying detection process is started in step S4. Next, when it is confirmed in step S5 that a predetermined time t2 (for example, 20 seconds) has passed, energization to the boiling heater 4A is started in step S6 (in other words, "main heating" is started, and control is performed). Ends.

As described above, as shown in the time chart of FIG. 8, the electric heater 4 (boiling heater 4 </ b> A, heat retaining heater 4 </ b> B) and the inner container 3 are in a high-temperature state as in the case of reuse immediately after using the electric pot. Even if the power is turned on for 10 seconds, the “preheating” 10 seconds plays the role of “main heating”, causing hot water convection, and even if the temperature T detected by the temperature sensor 12 rapidly increases (FIG. 8). At that time, the air-blow detection process is not started, so that a sudden rise in the detection temperature T is not erroneously detected as air-blow.
(II) Airing detection process II (refer to the flowchart of FIG. 7)
This empty detection process II is started after a predetermined time t3 (for example, 20 seconds) after the addition of water. In this case, in the electric pot according to the present embodiment, when the water is added, automatic reboiling is always started in the electric pot according to the present embodiment. , 20 seconds) is added, so this convection waiting time is used.

  When the boiling mode is started and it is confirmed in step S1 that water has been added, and in step S2, it is confirmed that a predetermined time t3 (for example, 20 seconds) has elapsed, in step S3, the heat retaining heater 4B and the boiling heater. Energization to 4A is started, and an emptying detection process is started in step S4. Thereafter, when it is confirmed in step S5 that a predetermined time t1 (for example, 10 seconds) has elapsed (in other words, it is confirmed that “preheating” has ended), in step S6, the boiling heater 4A is supplied to the boiling heater 4A. When energization is stopped and then it is confirmed in step S7 that a predetermined time t2 (for example, 20 seconds) has elapsed, energization of the boiling heater 4A is started in step S8 (in other words, “main heating”). Is started and the control ends.

  If it does as mentioned above, as shown in the time chart of FIG. 10, water is added aiming at the detection part (namely, the inner bottom part of the inner container 3) of the temperature sensor 12 with a kettle or the like while keeping a large amount of hot water. In this case, after the detection temperature T of the temperature sensor 12 is lowered, the hot water that has been kept up until now in the sensor detection section comes due to the convection of water, and it is erroneously determined that the temperature sensor 12 has rapidly increased in temperature. In some cases, it may be detected as “empty”, but after a predetermined time t3 (for example, 20 seconds) corresponding to the convection waiting time when water is added as in the present embodiment. Since the air blow detection process is started, the air blow detection process is not started in the time zone in which the detection temperature T of the temperature sensor 12 suddenly rises (see part B in FIG. 10). Rapid temperature T It will no longer be falsely detected as a sky rise.

  In addition, when there is a sudden drop in hot water temperature due to the addition of water or the like, and automatic re-boiling is being executed, the emptying detection is not performed.

  In addition, in the hot water detection process II, the hot water temperature after adding water is set to a temperature higher than 50 ° C.

  In the above-described airing detection process, when airing is detected, it is desirable to notify by an appropriate notification means (for example, a buzzer).

  In the above embodiment, the electric pot of the type that cools the inner container using the cooling fan has been described. However, the present invention is of course applicable to an electric pot that does not have a cooling fan.

It is a front view of the electric pot concerning an embodiment of the invention of this application. It is a longitudinal cross-sectional view of the electric pot concerning embodiment of this invention. It is a rear view of the electric pot concerning embodiment of this invention. It is an enlarged plan view which shows a part (operation panel part) of the upper surface of the electric pot concerning embodiment of this invention. It is a block diagram which shows the connection state of the electrical element in the electric pot concerning embodiment of this invention. It is a flowchart which shows the content of the empty detection process I in the electric pot concerning embodiment of this invention. It is a flowchart which shows the content of the empty detection process II in the electric pot concerning embodiment of this invention. It is a time chart which shows the time course of the emptying detection process I in the electric pot of a prior art example, and the electric pot concerning embodiment of this invention. It is a time chart which shows the time passage of the emptying detection process in the electric pot of a prior art example. It is a time chart which shows the time passage of the emptying detection process II in the electric pot concerning embodiment of this invention.

1 is a container body 2 is a lid 3 is an inner container 4 is a heating means (electric heater)
4A is a boiling heater 4B is a heat retaining heater 6 is an electric hot water supply pump 12 is a temperature detecting means (temperature sensor)
60 is a microcomputer control unit

Claims (1)

A container main body having an inner container and a lid for boiling water, a heating means for heating the inner container, and a temperature detection means for detecting the temperature of the inner container, and the temperature detected by the temperature detection means is rapidly increased. An electric pot configured to detect emptying by rising, and when the water is added to the inner container, heating by the heating means is performed after elapse of the convection waiting time after the addition of water. An electric pot characterized by being configured to start and perform an emptying detection process.

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