JPH0595424U - Electric hot water storage container - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to maintain the upper limit temperature very close to the boiling point at each time, regardless of the difference in boiling point, without causing a boiling state in the heat retention mode. [Composition] Boiling detection means 33 for detecting boiling of the content liquid,
101, content liquid temperature detection means 3 for detecting the temperature of the content liquid
3, 101, heater 61b to boil the content liquid,
An energization control means 10 having a boiling water mode for controlling the energization of 61c and a heat retention mode for energizing the heater to keep the content liquid at a predetermined heat retention temperature when the content liquid boils.
1, 304, means 33, 101 for detecting the temperature of the content liquid when the content liquid boils, a predetermined heat-retention temperature at which the content liquid is kept in the heat-retention mode, a certain range from the boiling point of the content liquid when boiling It is characterized in that it is provided with a heat retention temperature setting means 101 for setting it low.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an electric hot water storage container in which a liquid content is heated by a heater and kept at a predetermined temperature after the liquid content has boiled, and is used for household electric pots and the like.

[0002]

[Prior Art]

 In this type of electric hot water storage container, the temperature of the content liquid was originally set to about 80 to 90 ° C to save energy when not in use and to reboil the content liquid relatively early if necessary. It was designed to be used.

However, recently, the content liquid is kept at a temperature as close to boiling as possible to prevent a large amount of high-temperature steam from being generated due to continuous boiling and a rapid decrease in the content liquid, which is necessary. Accordingly, it has become desirable to be able to use the boiling content liquid as soon as possible, and the heat retention temperature is set to about 95 ± 3 ° C.

This is to cope with the fact that the boiling point of the content liquid is lowered to near 98 ° C. due to the decrease of the atmospheric pressure in high altitudes and the like, and it depends on the place of use while keeping the content liquid at a high temperature. It is possible to avoid boiling of the content liquid in the heat retention mode.

[0005]

[Problems to be solved by the device]

 However, today, it is desired to obtain a boiled content liquid almost immediately if necessary, and the conventional heat retention temperature is still insufficient.

[0006] If this is simply dealt with by raising the heat retention temperature, there is a disadvantage that the content liquid boils even in the heat retention mode depending on the place of use.

Therefore, the present invention automatically responds to boiling when used at any place with a different boiling point, and the content liquid is kept at a heat-retention temperature lower than the boiling point by a very small temperature range that does not always see boiling. It is an object of the present invention to provide an electric hot water storage container that can meet the above-mentioned requirements by keeping the temperature of the electric hot water.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned problems, the present invention detects boiling of the content liquid in an electric hot water storage container in which the content liquid is heated by a heater and the content liquid is boiled and then kept at a predetermined temperature. Detection means, content liquid temperature detection means for detecting the temperature of the content liquid, a water heating mode in which the heater is energized to boil the content liquid, and the content liquid is kept at a predetermined heat retention temperature when the content liquid boils. An energization control means having a heat retention mode for controlling the energization of the heater, a means for detecting the temperature of the content liquid when the content liquid boils, a predetermined heat retention temperature at which the content liquid is retained in the heat retention mode, It is characterized by being equipped with a heat-retention temperature setting means for setting a certain width lower than the boiling point of the.

[0009]

[Action]

 In the above configuration of the present invention, when the content liquid boils in the water heating mode, it switches to the heat retention mode. At this time, the energization control means controls the energization so that the content liquid is kept at the set heat retention temperature, but the boiling point when the content liquid is boiled by the boiling temperature detection means at each use when the content liquid is boiled in the boiling water mode. Is detected, and the temperature is kept lower by a certain amount depending on the boiling point detected each time, so the boiling temperature will not be raised for boiling points that differ depending on the actual use location. The content liquid can be kept warm at a temperature.

[0010]

【Example】

 Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 to FIG. 6 show a first embodiment of the present invention, showing an electric pot capable of boiling water and pouring the content liquid by a non-pressurized type electric pump.

As shown in FIG. 1, an inner container 2 is housed in an outer case 3 to form a body 1. The inner container 2 receives an upper end flange by a shoulder member 4 made of synthetic resin which is forcibly fitted to the upper end of the outer case 3.

A bottom ring 5 made of synthetic resin is applied to the lower end of the outer case 3, and the bottom ring 5 and the bottom of the inner container 2 are connected by a connecting fitting (not shown) to connect the outer case 3 and the inner container 2 to each other. And the bottom ring 5 are integrated with each other. The bottom cover 10 is attached to the opening of the bottom ring 5 by fitting a plurality of claws provided on the bottom ring 5 and fixing it with a screw at one place. The rotary seat body 9 is rotatably fitted by the plurality of claws so that the body 3 can be rotated on the rotary seat body 9 when the body 1 is stationary.

A pouring path 11 for pouring out the content liquid is connected to the bottom of the inner container 2. The pouring path 11 is a space between the inner container 2 and the outer case 3 and rises up into a beak-shaped projection 12 provided at the front part of the shoulder member 4, and is bent in a U-shape at this portion. The discharge port 19 opens downward. A pouring pump 13 for feeding the content liquid flowing into the pouring path 11 to the discharge port 19 is provided at a portion of the pouring path 11 below the inner container 2 and is driven by a motor.

The liquid content discharged from the discharge port 19 is once exposed to the atmosphere, and then integrally molded with the lower cover 15 attached to the lower portion of the beak-shaped protrusion 12 and attached to the front portion of the outer case 3. The liquid is injected into the liquid injection guide 16 guided by the liquid injection guide 16.

Further, the rising portion of the pouring path 11 is provided with a liquid amount detection unit 21 for detecting the amount of liquid by utilizing the same liquid level as that of the inner container 2 by a capacitance method or a photo sensor method. A water shutoff valve 22 at the time of tipping is provided immediately upstream of the bent portion of the spout passage 11.

A boiling water heater 61b and a heat retention heater 61c are applied to the lower surface of the bottom of the inner container 2.

The boiling water heater 61b and the heat retention heater 61c are obtained by alternately winding a heater wire around an annular mica plate, sandwiching the heater wire between the mica plates, and accommodating them in a case.

A heat shield plate 24 is screwed under the bottom of the inner container 2 by using a metal fitting 23, and the heat shield plate 24 must be pressed between the heat shield plate 24 and the bottom of the heaters 61b and 61c. 28 is sandwiched, whereby both heaters 61b and 61c are pressed against the bottom surface of the bottom of the inner container 2. The pouring pump 13 is attached to a part of the heat shield plate 24.

A temperature sensor 33 that senses the temperature of the content liquid is provided in the through hole in the center of the heaters 61b and 61c, and is thermally isolated from the heaters 61b and 61c by a heat shield wall 34. , 61c so that the temperature of the inner container 2 can be accurately detected without being affected by heat.

A circuit housing box 41 is provided on the bottom ring 5 so as to open downward. As a result, the circuit board 48 housed in the circuit housing box 41 is waterproofed against water leakage from above.

A body lid 62 is provided on the upper end of the body 1. The body lid 62 is pivotally attached to the shoulder member 4 by a hinge pin 63 at the rear portion thereof so as to be openable and closable. This pivoting is performed on the bearing member 64 that is detachably fitted to the shoulder member 4, and the body lid 62 can be attached and detached by attaching and detaching the bearing member 64. This facilitates cleaning of the inside of the container 1 and supply / drainage of the content liquid.

The bearing member 64 is inserted into the concave portion 65 of the shoulder member 4 from above, and one end 68 a of the spring 68 that acts around the hinge pin 63 so as to bias the body lid 62 in the opening direction is provided in the concave portion 65. The bearing member 64 is securely locked in the mounted state by elastically engaging with the locking portion 66.

To release this, the vessel lid 62 is further rotated in the opening direction from a predetermined open position where the biasing force of the spring 68 acts, and one end 68a of the spring 68 follows this movement, Since it disengages from the locking portion 66, the bearing member 64 may be lifted together with the body lid 62 in this state.

The free end of the body lid 62 is elastically engaged with the locking portion 71 of the shoulder member 14 by the bias of the spring 72, and the lock member 69 that locks the body lid 62 in the closed state. Is provided.

The lock member 69 is guided forward and backward by a protrusion 83 formed on the upper surface of the back plate 82 of the body lid 62.

On the slope 75 of the lock member 69, the projection 72 at the tip of the lock release lever 77, which is pivotally attached at the rear by the shaft 76 to the bearing 150 in the body lid 62, is in contact. When the lock member 69 is advanced to the engaging position by the spring 71, the lock release lever 77 is pushed upward by the sloped surface 75 through the protrusion 78, and the operation portion 79 at the tip end is a body. The upper surface opening 81 of the lid 62 is exposed so as to be flush with the surface of the body lid 62.

When the operating portion 79 is pushed down in this state, the lock release lever 77 is rotated counterclockwise to push the slope 75 of the lock member 69 by the protrusion 78, and the lock member 69 is resisted against the spring 68. It is retracted to disengage the engagement portion 72. Therefore, the lock of the body lid 62 in the closed state is released. At the time of completion of the unlocking, there is a play in the unlocking direction between the lock release lever 77 and the body lid 62, and the body lid 62 is released from the pressing operation of the lock release lever 77. Whether or not it is present, it is slightly rotated in the opening direction by the spring 68.

As a result, the lock member 69 is slightly displaced upward from the position of the locking portion 71, so that the lock member 69 is again locked by the natural operation of releasing the hand from the operating portion 79 when releasing the lock. The body lid 62 is automatically opened to the fully opened state by the bar 68 without engaging with the.

A safety member 114 is operated on the lock release lever 77. The safety member 114 is supported by the body lid 62 so as to be slidable in the longitudinal direction of the lock release lever 77. When the operating portion 114a is slid, the locking portion 114b is moved back and forth under the tip of the lock release lever 77, and when the lock portion 114b is under the tip, the lock release lever 77 is prevented from moving, We try to prevent inadvertent unlocking.

A metal inner lid 85 that closes the rear part of the inner container 2 is applied to the lower surface of the back plate 82 of the body lid 62, and is screwed with a screw 80. A seal packing 86 facing the rim of the inner container 2 is sandwiched between the outer periphery of the inner lid 85 and the back plate 82, and when the body lid 62 is closed, the inner lid 85 is the seal packing 86 portion. The inner container 2 is closed by touching the rim of the inner container 2.

A steam passage 87 is provided between the inner lid 85 and the back plate 82 to allow steam generated in the inner container 2 to escape to the outside. The steam passage 87 has an opening 88 on the inner lid 85 toward the inner container 2 side, and an opening 89 to the outside on the upper surface on the rear side of the vessel lid 62. A valve chamber 91 fitted to the back plate 82 from below is provided in the opening 88, and a water shutoff valve 92 at the time of falling is provided in the valve chamber 91 which is closed when the body 1 falls.

Immediately downstream of the valve chamber 91 is provided a reservoir 93 having a wide space reaching the upper portion of the vessel lid 62, and the vessel 1 is tumbled to either the front or rear or the left and right to When it tries to flow out through the steam passage 87 without being stopped even by the water stop valve 92 at the time of the fall, the content liquid that is about to flow out is stored in the reservoir 93, and flows to the downstream side until the content liquid overflows. We try to suppress and prevent the outflow.

As a result, the outflow of the content liquid to the outside is suppressed, and it is possible to provide a sufficient time margin for returning the container 1 to a normal state before the outflow to the outside. For this reason, the passage cross-sectional area of the outlet 94 from the reservoir 93 to the downstream side is made small, and the shape of the first reservoir 93 with respect to the outlet 94 is defined by the front, rear, left and right directions of the body 1. Various measures are taken such as having a spread on the upper surface side of the body lid 62.

The control circuit 100 mounted on the circuit board 48 uses a microcomputer 101. The operation panel 201 provided on the upper surface of the beak-shaped protrusion 12 is as shown in FIG. 2, and in addition to the pouring operation key 102, the re-boiling / descaling removal setting key 104, the timer setting key 105, the pouring lock / unlocking. A key 106, a liquid volume display unit 107, boiling, descaling and heat retention display units 108 to 110, and timer set time display units 111 to 113 are provided.

The re-boiling / scalping removal setting key 104 and the pouring lock / release key 106 are configured so that the setting mode changes to a rotary type each time they are operated.

FIG. 3 shows a control circuit 100, and as shown in the figure, the microcomputer 101 includes the A / D converter 301, the switch circuit 303, the drive circuit 304, and the display circuit 305 which are the electric and electronic parts related to the various inputs and outputs. Are properly connected via.

The operation control will be described below. FIG. 4 is a flow chart of the main routine showing the main operation control. When the power is turned on, the initial setting of step # 1 is first performed, and then the processing corresponding to various inputs and outputs is performed (step # 2). Next, when the boiling process (step # 3) is called and the content liquid is below the required temperature for boiling water, that is, when the temperature is low due to the initial water supply or the addition of the content liquid, the re-boiling / calcination removal setting key 104 When re-boiling is set by, the content liquid is boiled, and is controlled to be heated to boiling at high speed in a high-capacity energized state by both the heat retention heaters 61b and 61c.

Subsequently, the heat retention process (step # 4) is called, and after the initial boiling or reboil, the water heater 61b is turned off, and the heat heater 61c is turned on / off depending on whether the content liquid is below the set heat retention temperature. Then, the energization is controlled so that the content liquid is kept at the set temperature.

In this heat retention process, the boiling point when the content liquid is boiled in the boiling mode is detected, and the heat retention temperature is set lower than the detected boiling point by a constant width t, and the set heat retention temperature is set to this set temperature. The energization is controlled so that the content liquid is maintained.

As a result, it is possible to keep the content liquid at the upper limit temperature that does not cause boiling, with respect to the boiling point that differs depending on the place of actual use.

Further, when the timer process (step # 5) is subsequently called and the timer is set by the timer setting key 105, the boiling operation start time is required to boil the content liquid at the timer setting time. Delay control is performed so that the boiling operation is started after the time is reached.

Next, when the descaling process (step # 6) is called and the reboiling / descaling removal setting key 104 is operated in the descaling mode, the boiling operation in step # 3 should be continued for a predetermined time. To control. However, the boiling operation may be repeated intermittently to remove the chlorine. Further, during the descaling process, the side heater 61a and the bottom heaters 61b and 61c are alternately energized. In this case, the content liquid is different from the convection when it is heated by the side heater 61a and the convection when it is heated by the bottom heaters 61b and 61c, depending on the difference in the heating position. Since it is disturbed, it is possible to promote the odor and the release of foreign substances such as chlorine and its compounds.

Next, the pump processing subroutine (step # 7) is called, and the motor 14 of the pouring pump 13 is driven by the operation of the pouring operation key 12 so that the extraction is performed.

Finally, after the other processing (step # 8) is completed, the procedure returns to step # 2, and the above control is repeated thereafter.

FIG. 5 is a flowchart showing a specific example of the heat retention processing subroutine in FIG.

First, when boiling ends (step # 1), it is determined in step # 2 whether or not the heat retention flag indicating heat retention is 1, and if not 1, the process proceeds to steps # 3 to # 7. The resistance value _RA of the temperature sensor 33 in the boiling state is detected as the boiling point of the content liquid, and the detected resistance _RA at the boiling point is lower than the detected boiling point by a constant width t such that the content liquid does not boil. The resistance value R _{(2 C)} corresponding to the difference from the upper limit temperature (set heat retention temperature) is added to set the upper limit temperature, that is, the resistance value R _H corresponding to the set heat retention temperature, and the water heating heater 61b and the heat retention heater 61c are set. Is turned off to switch to the heat retention state, the heat retention flag is set to 1, and then the process proceeds to step # 9.

If the heat retention flag is not 1 in step # 2, the process directly proceeds to step # 9.

In step # 9, it is determined whether or not the resistance value R ₀ of the temperature sensor 33 corresponding to the content liquid temperature is equal to or higher than the resistance value R _H corresponding to the set heat retention temperature. If not, the content liquid is set to the heat retention temperature. Since the temperature is higher than the temperature, the heat-retaining heater 61c is kept in the off state, which means that the content liquid has cooled to the set heat-retaining temperature, and the heat-retaining heater 61c is turned on until it exceeds the set heat-retaining temperature. By doing so, the content liquid is kept in the set heat retention temperature range (steps # 9, # 10).

The processes of steps # 9 and # 10 are performed by the temperature reduction to the required temperature for boiling water by replenishing the content liquid in the heat retention mode in step # 11, and the re-boiling / calcination removal key 104. It continues until it is determined that boiling will occur due to the re-boiling mode being set.

However, when it is determined that boiling is performed, the process proceeds to step # 12, the flag during heat retention is reset to 0, the process returns to the main routine, and it is possible to switch to the water heating mode.

In such a treatment, when t is 2 ° C. when the heat retention temperature is set to be lower than the boiling point by a constant width t, when the content liquid boils at 100 ° C. or sometimes as shown by the solid line in FIG. The set heat retention temperature is set to 98 ° C, and the content liquid is kept in the temperature range of 98 ° C.

Further, as shown by the broken line in FIG. 6, when the content liquid boils at 99 ° C. or sometimes, the preset heat retention temperature is set to 97 ° C., and the content liquid is kept in the temperature range of 97 ° C.

[0054]

[Effect of the device]

 According to the present invention, when the boiling water mode is switched to the warming mode, the energization control means controls the energization so as to keep the content liquid at the set warming temperature, but at each use when the content liquid is boiled in the boiling water mode. Each time, the boiling temperature when the content liquid boils is detected by the boiling temperature detecting means, and the warming temperature is set by the warming temperature setting means which is lower than that depending on the boiling point detected at each time. For the boiling point that differs depending on the actual use place, the content liquid is kept warm to the upper limit temperature that does not cause boiling, and while avoiding the boiling state in the warming mode, the content liquid is filled to the maximum according to the boiling temperature at that time. It is possible to keep the content liquid at a sufficiently high temperature and use the content liquid at a sufficiently high temperature as it is, or to boil the content liquid while keeping it warm for immediate use.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric pot showing a first embodiment of the present invention.

FIG. 2 is a plan view of an operation panel of the electric pot of FIG.

FIG. 3 is a block diagram of a control circuit of the electric pot of FIG.

4 is a flowchart showing a main routine of main operation control of the electric pot of FIG.

5 is a flowchart showing a heat retention processing subroutine of FIG. 4. FIG.

FIG. 6 is a graph showing the temperature change of the content liquid from the water heating mode to the heat retention mode in the case of the processing of FIG. 4 for two cases with different boiling points.

[Explanation of symbols]

 33 Temperature Sensor 61b Water Heater 61c Insulation Heater 100 Control Circuit 101 Microcomputer 304 Drive Circuit

Claims (1)

[Scope of utility model registration request] 1. An electric hot water container in which a content liquid is heated by a heater to boil the content liquid and then keep the temperature at a predetermined temperature. Boiling detection means for detecting boiling of the content liquid, and detection of the temperature of the content liquid. There is a content liquid temperature detection means, a water heating mode in which the heater is energized and controlled to boil the content liquid, and a heat retention mode in which the heater is energized and controlled to keep the content liquid at a predetermined heat retention temperature when the content liquid boils. The energization control means, the means for detecting the temperature of the content liquid when the content liquid boils, the predetermined heat retention temperature at which the content liquid is kept in the heat retention mode is set to a certain width lower than the boiling point of the content liquid when boiling. An electric hot water storage container, which is provided with: