JPH04135233U - electric hot water storage container - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically continues boiling in the right amount depending on the amount of liquid in it to release odors and harmful substances such as trihalomethane. [Structure] Means for detecting the temperature increase rate of the liquid content, and when controlling the energization of the heater in the boiling state, when a predetermined temperature rise rate β, which the content liquid reaches by continuing boiling, is detected, energizing the heater in the boiling state. The heating control device is characterized in that it is provided with a heating control means for terminating the control.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an electric hot water storage container, and in particular, the content of the container is heated in both a boiling state and a warm state. The present invention relates to an electric hot water storage container that can be used to store hot water.

0002

[Conventional technology]

Conventionally, this type of electric hot water storage container determines the boiling state by detecting the boiling of the liquid inside. It is designed to stop and move to a warm state.

0003

[Problem that the idea aims to solve]

This is only to use the liquid content for purposes that are suitable for high temperatures, such as making coffee or tea. If you think about it, you'll be satisfied. However, on the other hand, boiling the liquid content is Release of odor from the liquid content or release of harmful substances such as trihalomethane Depending on the purpose, person, or region, boiling the liquid content is becoming more important. In some cases, it may not be sufficient to simply use

0004 Utility Model Application No. 61-77922 and Utility Model Application No. 61-54726 disclose that when the content liquid is boiled, It is disclosed that this boiling is continued for a predetermined period of time. In this case, the content liquid It is possible to actively try to release odors and harmful substances such as trihalomethane.

[0005] However, the difficulty of emitting these odors and trihalomethanes is greatly affected by the amount of liquid inside. It is heavily influenced.

[0006] Therefore, if boiling is continued uniformly, excess or deficiency will occur. Excessive continuation of boiling is a problem in terms of energy conservation, and a shortage causes problems in the use of the liquid content.

[0007] Therefore, the present invention is an electric hot water storage container that can solve such problems with simple improvements. The purpose is to provide the following.

[0008]

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this invention uses a heater that heats the liquid content; control means for controlling the energization of the heater between the boiling state and the keeping temperature state; There is a means to detect the rate of temperature increase, and when the heater is energized while the water is boiling, the content liquid is boiling. When a predetermined rate of temperature increase is detected as the temperature continues to rise, electricity is controlled while the water is boiling. The invention is characterized in that it is provided with a heating control means for terminating the heating.

[0009]

[Effect]

The heater is energized by a control means, and when boiling water, it heats the content to boiling point. It can be heated, and in the keep warm state, it heats the contents to keep it within the specified keep warm temperature range. can be done. Especially when the water is boiling, if the content boils, the heating control means will work. The boiling state of the content liquid is continued by the boiling state, and the content that can be reached by continuing this boiling When the predetermined temperature increase rate of the liquid is detected by the detection means, the heating in the boiling state is terminated. Therefore, the time required to reach the specified temperature increase rate may vary depending on the amount of liquid contained. Automatically achieve continuous boiling processing for a period of time according to the amount of liquid contained in the boiling liquid. I can do it.

0010

【Example】

An embodiment of the present invention shown in FIGS. 1 to 6 will be described.

[0011] In this embodiment, as shown in FIG. 1, a heater 1 is attached to the lower surface of the bottom of the inner container 2. into a control circuit 91 (Figure 3) including a microcomputer (hereinafter referred to as microcomputer) 66. energization is controlled via the heater drive circuit 92 between the boiling state and the keeping temperature state to apply the content liquid. Occasionally, it is heated to an appropriate temperature to keep it warm.

0012 The inner container 2 is housed and held in an outer case 3 to form a container body 4. Inner container 2 The mouth part 2a is connected to the upper end of the outer case 3 by a shoulder member 5 made of synthetic resin. An outer cover 7 is pivotally connected to a rear hook-shaped bearing 9 of 5 by a shaft 6 so that it can be opened/closed and detached. Ru. An inner cover 8 applied to the mouth 2a of the inner container 2 is attached to the lower surface of the outer cover 7. It opens and closes in one piece.

[0013] Inside the outer cover 7 is a bellows pump that is operated by pushing the top pressing plate 10 of the outer cover 7. 11 is provided, and an air supply passage 13 provided between the inner cover 8 and the bellows pump bottom plate 12 is provided. Pressurized air is sent into the inner container 2 through the inner container 2 to pressurize the inner liquid.

[0014] The air supply passage 13 is provided with a steam vent passage 15 that exits to the upper surface of the outer lid 7 through a branch hole 14. , the steam generated during heat retention and boiling by the heater 1 is released to the outside, causing an abnormality inside the inner container 2. It is designed not to increase pressure.

[0015] The branch hole 14 is opened by a valve 36 that is moved down in conjunction with the pressing operation of the bellows pump 11. Therefore, the air supply port 16 of the bottom plate 12 of the bellows pump is closed and pressurized when the content liquid is pressurized. Air escapes to the steam vent passage 15, or steam enters the bellows pump 11 when hot water is stored. It is designed to prevent break-ins.

[0016] The outlet passage 17 that guides the pressurized content liquid upward to the outside of the inner container 2 has a proximal end connected to the inside. It is connected to the bottom of the container 2, communicates with the inner container 2 at the bottom, and opens to the outside at the top. Due to this, the content liquid 42 in the inner container 2 always flows in and maintains the same level. It looks like this. A synthetic resin elbow 20 is connected to the upper end of the lead-out path 17. child The elbow 20 is an inverted U fixed to the back side of the beak-shaped part 5a of the shoulder member 5 that extends to one side. Connected to junction tube 23. The inverted U-shaped pipe 23 has a water stop valve in the event of a fall just above the connection with the elbow 20. 25 is built in, and the downward discharge port 19 at the tip of the inverted U-shaped tube 23 is located on the front side from the bottom end. A slit 26 is formed that reaches above the full water position of the inner container 2.

[0017] A pipe cover 27 is provided below the beak-like portion 5a of the vessel body 4 and is shaped to surround the beak-like portion 5a. The beak-shaped portion 5a and the outer case 3 of the vessel body 4 are fitted into the beak-shaped portion 5a and the outer case 3 of the vessel body 4. pipe cover 27 The bottom part receives the liquid discharged from the discharge port 19 of the inverted U-shaped pipe 23 in a state open to the atmosphere. A liquid injection guide tube 24 is detachably attached from below to allow the liquid to flow out toward the side.

[0018] The slit 26 is also involved in this reception in an open state to the atmosphere, and the siphon, To reliably prevent a splash phenomenon and the gushing out of content liquid in the case of sudden pouring.

[0019] The liquid injection guide tube 24 is removably fitted into the beak-shaped portion 5a of the shoulder member 5, and is Accept the liquid discharged from port 19 with a slightly large diameter, and then squeeze it moderately. Let it flow downwards gently.

[0020] A water stop valve 29 is provided in the air supply passage 13.

[0021] The rising part of the content liquid outlet path 17 is the liquid level detection part 17b, which is made of an insulating material. Ru. Specifically, glass may be used, but resin has a higher dielectric constant and is easier to obtain changes in capacitance. This also suppresses the unspecified level of the liquid level caused by the swelling caused by surface tension around the liquid level. You can get it. The liquid level detection part 17b is a straight connecting pipe 17c made of synthetic resin, and a bent pipe made of metal. Connected to the bottom of the inner container 2 via 17a, synthetic resin elbow 17d, and metal connection port 17e. has been done.

[0022] Here, an aluminum foil 41 is wrapped around the outer periphery of the liquid level detection part 17b to serve as the first electrode. , the curved pipe 17a electrically connected to the liquid content in the liquid level detection section 17b is used as a second electrode. , the content liquid 42 in the liquid level detection part 17b communicating with the first electrode 41 and the second electrode 17a is The size of the opposing area, that is, the content liquid 42 It is designed so that the capacitance can be obtained according to the liquid level height.

This difference in capacitance depending on the liquid level can be achieved by connecting the first and second electrodes 41, 17a to the microcomputer 66 of the control circuit 91 via the water amount detection circuit A as shown in FIG. So, I am inputting it to the microcontroller 66. As a result, the microcomputer 66 determines the level of the liquid content based on the input corresponding to the difference in capacitance, and depending on the determination, the light emitting diode 42 ₁ for external display connected to the microcomputer 66 via the display circuit B is activated. , 42 ₂ ... 42 ₆ are driven, and the liquid level is displayed externally. Note that in order to determine the liquid level, it is easy to prepare a table of the relationship between capacitance and liquid level in necessary stages, and to make the determination based on this table.

The light emitting diodes 42 ₁ to 42 ₆ are arranged to illuminate and display through a display window 44 provided in a resin panel 43 fitted to the front of the exterior body 1, as shown in FIGS. 1 and 2. The lowest light emitting diode ₄₂₁ corresponds to the safe minimum water level and displays a prompt to supply water, the highest light emitting diode ₄₂₆ displays the full water level, and the other light emitting diodes ₄₂₂ to ₄₂₅ display intermediate liquid levels.

[0025] In addition, light emitting diodes 46 and 47 for indicating boiling and heat retention are installed below these display parts. These are also connected to the microcomputer 66 via display circuit B for each display. ing.

[0026] On the other hand, the heater 1 is divided into a heat retention heater 1a and a hot water heater 1b, and a heater drive circuit 92 It is connected to the microcomputer 66 via a It is possible to boil the contents of the liquid until it boils, and it is possible to control the energization of only the heat-retaining heater 1a. The content can be heated and kept warm to maintain a predetermined temperature before boiling. It looks like this.

[0027] Electricity is turned on when the water is boiling when the temperature of the liquid content detected by the temperature sensor 68 (Fig. 1, Fig. 3) is When the required boiling temperature is considerably lower than the keeping temperature, and when the water is kept warm, re-boiling is not possible. This is done when the switching switch 45 is turned on. Change in temperature detected by temperature sensor 68 Boiling is detected based on whether a predetermined temperature increase rate α has been reached. And boiling is detected. When notified, the boiling state is continued for a predetermined period of time, and then the temperature is returned to the keeping temperature state.

[0028] To set this boil duration, the boil duration setting signal switch 79 is connected to the boil switch. It is connected to the microcomputer 66 through the switching circuit C along with the switch 45, and its operation keys are A door 79a and an operation button 45a are provided at the bottom of the panel 43. Boiling duration setting The constant signal switch 79 switches off the signal line by rotating the operating knob 79a. Alternatively, various methods can be used, such as inputting signals corresponding to each set time position to the microcontroller 66. can be adopted.

[0029] The control knob allows you to set the boiling duration in five levels from 0 to 4. Level 0 is normal boiling, and heat retention occurs as soon as it is detected that the temperature increase rate has reached α. Level 1 is the temperature increase rate β that ends boiling, and β = (1/2) α. Set, level 2 is β = (1/3) α, level 3 is β = (1/4) α, level 4 is set to β = (1/5) α, and the duration of boiling is changed sequentially as shown in Figure 4. Make it longer.

[0030] To explain this based on Figure 5, the temperature sensor 68 is The temperature rises at almost the same rate, and at the point of boiling

[0031]

[Math 1]

[0032] The boiling temperature can be detected by determining this with the microcomputer 66. I can do that.

[0033] Also, if boiling continues, the temperature increase rate of temperature sensor 68 will be

[0034]

[Math 2]

[0035] becomes extremely small.

[0036] Therefore, set the temperature increase rate β corresponding to a predetermined point in time when you want to continue boiling and end it. The temperature rise rate is set for each level, and boiling is stopped when this temperature increase rate is detected. The temperature is maintained for a predetermined period of time.

[0037] Note that a transparent resin cover sheet 48 is applied to the front surface of the panel 43, and each Annotations, etc. corresponding to the species display and operation are printed.

[0038] The microcomputer 66 is installed on the board 67 along with other circuit parts of the control circuit 91 including it. The signal buzzer 65 operates based on the clock signal from the clock generation circuit D. It also controls movement. The signal buzzer 65 should be activated when there is a water supply warning or abnormal temperature rise.

[0039] The microcomputer 66 is also connected to the plug disconnection circuit E, which handles the plug disconnection. Ru.

[0040] This board 67 is integrally formed with a part of the annular bottom plate 71 attached to the lower end of the outer case 3. The control box 72 is housed from below in a control box 72 that opens downward, and is secured with screws.

[0041] A rotating bottom plate 72 is attached to the outer periphery of the bottom plate 71. The rotating bottom plate 72 has an annular outer wall 73 and an annular interior wall 74 form a ring whose lower ends are connected to each other, and the bottom plate 71 and its lower surface It is rotatably held between a locking ring 76 attached via a support fitting 75 to the locking ring 76. In addition The support fitting 75 is attached to the bottom plate 71, and the locking ring 76 is attached to the support fitting 75, respectively.

[0042] A connection terminal 101 from the control circuit 91 to the first electrode 41 contacts the outer surface of the first electrode 41. The tip is pressed by the shrink resin film 102 covering the liquid level detection part 17b, and the first The contact with the electrode 41 is maintained firmly.

[0043] Further, from above the shrink resin film 102, a resin is further applied to the base portion of the terminal 101. It is tightened with a grease band 103 to prevent the terminal 101 from coming off.

[0044] The connection terminal 104 to the second electrode 17a is a metal spot welded to the second electrode 17a. It is connected to piece 105.

[0045] The following is a flowchart of the heater control subroutine shown in FIG. 6 regarding heater control. I will explain based on.

[0046] If the reboiling switch 45 is not on and the content is not boiling at a temperature higher than the required temperature, the A warming operation is performed (steps #101 to #103).

[0047] If the reboiling switch 45 is turned on or the content is at the temperature required for boiling ( In steps #101 and #102), the water boiling operation control in step #104 and subsequent steps is performed.

[0048] In this control, the boiling duration is set in steps #104, #107, #112, and #117. It is determined which level from 0 to 4 the level is. When the level is 0, the boiling temperature increase rate α The water boiling operation continues until it is detected that the As soon as it is detected that the boiling temperature rise rate α has been reached, the temperature control operation is switched to step #103. Ru.

[0049] When the level is 1, it is detected that the boiling temperature rise rate α has been reached after the water boiling operation starts. When the boiling end temperature increase rate β is set to β = (1/2) α, this temperature increase rate β is detected. The water boiling operation continues until the water boils (Steps #107 to #111). This causes boiling The state lasts for a certain period of time. At the same time as the boiling end temperature increase rate β is detected, heat retention is performed in step #103. state.

[0050] If the level below is 2, the same operation will occur with the boiling end temperature increase rate β = (1/3) α is performed (steps #112 to #116), and the boiling state lasts twice as long as at level 1. . Similarly, at level 3, the boiling state will last three times as long as at level 1 (step #117 ~ #121), at level 4, the boiling state lasts four times as long as at level 1. (Steps #122 to #125).

[0051] The amount of liquid is proportional to the degree of difficulty in releasing harmful substances such as odor and trihalomethane. . However, the temperature increase rate β at the end of boiling changes depending on the amount of the content liquid. Therefore, the content The larger the amount of liquid, the longer it takes to reach the predetermined boiling temperature β, and the more the amount of liquid increases. The higher the amount, the longer the boiling time is, making it difficult to emit odors and harmful substances such as trihalomethane. can be supplemented. As a result, regardless of the amount of liquid, odor and trihalometa The emission of light is automatically achieved to a degree commensurate with the set level.

[0052] However, the boiling temperature increase rate α also varies depending on the amount of liquid inside, so Regarding this, it is preferable to make a correction according to the amount of the content liquid. In this case, the liquid volume Create a table of the relationship between It is convenient to set the temperature increase rate α. The method of automatic detection of liquid volume is the method of the first embodiment. However, various methods can be adopted.

[0053]

[Effect of the idea]

According to the present invention, since it has the above structure and operation, the content liquid can be boiled and stored. In a heatable electric hot water storage container, when the content liquid boils, the heating control means boiling continues, promoting the release of odors and harmful substances such as trihalomethane. However, in particular, the continuation of this boiling can be achieved by the continuation of boiling of the content liquid. The temperature increase rate continues until the temperature increase rate is detected, and this temperature increase rate varies depending on the amount of liquid inside. , depending on the amount of liquid contained, the boiling duration becomes longer, causing odor and harmful substances such as trihalomethane. Since it promotes the release of quality, it achieves continuous boiling treatment with just the right amount or deficiency depending on the content liquid volume. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an electric kettle showing a first embodiment of the present invention.

FIG. 2 is a front view of the pot of FIG. 1;

FIG. 3 is a block diagram of a control circuit.

FIG. 4 is a graph showing changes in liquid temperature in a sustained boiling state at each set level.

FIG. 5 is a graph showing an example of a temperature increase change of a temperature sensor corresponding to a liquid temperature change.

FIG. 6 is a flowchart of a heater control subroutine.

[Explanation of symbols]

1 Heater 1a Heater 1b Water heater 42 Content liquid 66 Microcomputer 68 Temperature sensor 91 Control circuit 92 Heater drive circuit β Heating rate

Claims (1)

[Scope of utility model registration request] 1. A heater for heating the liquid content, a control means for controlling the energization of the heater between a boiling state and a keeping temperature state, a means for detecting a temperature increase rate of the liquid content, and a control means for controlling the energization of the heater in the boiling state. An electric hot water storage container characterized in that it is provided with a heating control means that terminates energization control in a boiling state when a predetermined temperature increase rate reached by the continuation of boiling of the content liquid is detected.