JPH0319321Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to an electric hot water storage container having an electronic circuit board, and is used, for example, in electric pots where heating control and safety measures are controlled by a microcomputer. .

(Prior Art) Electric pots equipped with electronic circuit boards have become more common due to the introduction of control by microcomputers, and electronic circuit boards have also become large and equipped with many electronic components.

Such an increase in the size of the electronic circuit board makes it difficult to find a place to install it, and conventionally, the electronic circuit board is installed under the bottom of the inner container inside the outer case that houses the inner container provided with the heater.

(Problems to be Solved by the Invention) However, the heater provided in the inner container is located at the bottom of the inner container, and the electronic circuit board installed under the bottom of the inner container is easily affected by heat from the heater. In addition, in the unlikely event that overflowing liquid from the upper part of the vessel leaks into the vessel, it will be affected.

To solve these problems, the structure tends to become complicated due to the mounting of the electronic circuit board, heat shielding, and waterproof measures, and there is a need for a simple structure that can safely install the electronic circuit board, but this is not satisfied. Nothing has been proposed yet.

(Means for solving the problems) In order to solve the above problems, the present invention
A storage chamber for an electronic control board is integrally formed in the bottom member of the exterior body that houses the inner container provided with the heater, and the storage chamber is provided with a board entry/exit opening facing the outside of the exterior body. The feature is that a heat shield plate is provided on the plate.

(Function) An electronic circuit board is stored and installed in a storage chamber integrally formed in the bottom member of the exterior body through the board entry/exit opening facing the outside of the exterior body, and can be installed without any special parts. It also protects the electronic circuit board from the effects of heat and water leakage from above.

Furthermore, the thermal protection of the electronic circuit board can be further improved by the heat shield plate provided on the top plate of the storage chamber.

(Embodiment) The first embodiment of the present invention shown in FIGS. 1 to 8 shows the case of an air pump type tabletop electric pot, and as shown in FIG. An inner container 2 wrapped with 1 is housed and held in an outer case 3 to form a container body 4. The mouth portion 2a of the inner container 2 is connected to the upper end of the outer case 3 by a shoulder member 5 made of synthetic resin, and the outer lid 7 can be opened/closed and detached by a shaft 6 on a rear hook-shaped bearing 9 of the shoulder member 5. It is pivoted to. An inner cover 8 that is attached to the mouth 2a of the inner container 2 is attached to the lower surface of the outer cover 7, and is opened and closed integrally with the outer cover 7.

A bellows pump 11 is provided inside the outer lid 7 and is operated by a pressing plate 10 on the upper surface of the outer lid 7. Pressurized air is sent into the container 2 to pressurize the liquid inside. The air supply passage 13 is connected to the outer lid 7 through the branch hole 14.
A steam vent passage 15 is provided to escape to the upper surface of the inner container 2, and the steam generated during heat retention and boiling by the heater 1 is released to the outside to prevent abnormal pressure rise in the inner container 2.

The branch hole 14 is switched to the air supply port 16 of the bellows pump bottom plate 12 and closed by a valve 36 that is moved down in conjunction with the pressing operation of the bellows pump 11, so that pressurized air is not supplied when the content liquid is pressurized. Steam vent passage 15
This prevents steam from escaping to the bellows pump 11 or from entering the bellows pump 11 when hot water is stored.

A lead-out passage 17 for guiding the pressurized content liquid upward to the outside of the inner container 2 is provided with its base end connected to the bottom of the content liquid 2, and a synthetic resin elbow 2 is provided at the upper end.
0 is connected. This elbow 20 is connected to an inverted U-shaped tube 23 fixed to the back side of a beak-shaped portion 5a of the shoulder member 5 that extends to one side. Inverted U-shaped tube 23
is the water stop valve 2 in the event of a fall just above the connection with the elbow 20.
5 is built-in, and the downward discharge port 19 at the tip has a slit 26 formed on the front side thereof that reaches from the lower end to a position above the full water position of the inner container 2.
A pipe cover 27 that surrounds the beak-like portion 5a is provided below the beak-like portion 5a of the vessel body 4.
a and the outer case 3 of the vessel body 4. At the bottom of the pipe cover 27 is an inverted U-shaped pipe 23.
A liquid injection guide tube 24 is detachably attached from below to receive the liquid discharged from the discharge port 19 in an open state to the atmosphere and flow it downward.

The slit 26 is also involved in this open reception to the atmosphere, which reliably prevents siphon splash and the ejection of the contents in the event of rapid dispensing. The liquid injection guide tube 24 is removably fitted into the beak portion 5a of the shoulder member 5, and is connected to the discharge port 19.
The discharged liquid is received with a somewhat large diameter without difficulty, is rectified by a rectifying plate 28, and is made to flow quietly downward.

Although a check valve 29 is provided in the air supply passage 13, the check valve 29 may become temporarily unstable during a fall and may cause the contents to flow out. Although the amount of steam flowing out is small, if it flows out from the outer lid 7 through the steam vent passage 15, it may be dangerous if there is an infant in the area. Therefore, in addition to the air supply port 16 of the bellows pump bottom 12, the air supply path 1 is
3 is provided with an auxiliary communication hole 30 that communicates with the air supply passage 15 and is normally kept closed by a weight valve 31. When the content liquid flows out into the air supply passage 15, the outflow liquid tries to fill the air supply passage 15 and the weight valve 31 is closed. 31 and flows into the bellows pump 11 through the auxiliary communication hole 30,
Outflow to the steam vent passage 15 side through the branch hole 14 is suppressed.

Note that the steam sensor 3 is attached to a part of the shoulder member 5 from the back side.
7 protrudes into the steam vent passage 15 through a part of the through hole 15a, and boiling of the liquid inside is detected based on the steam temperature.

The rising portion of the content liquid outlet path 17 is a liquid volume display portion made of a transparent tube 17b, which can be seen through a transparent window 42 provided in a cover 41 fitted to the front portion of the exterior body 1. Further, a resin splint 43 with wings 43a is provided on the rear half of the transparent tube 17b of the liquid content pouring conduit 17 to catch external light and prevent leakage to the rear. resin panel 4
1 is provided with an operation button 44a for a re-boiling switch 44 that allows the heater 1 to boil the content liquid at a suitable time.
6. A water supply display section 47 and a previous remaining amount display section 48 are provided using light emitting diodes. The portions where these are provided are covered flush with a transparent resin cover sheet 49, and necessary indications are printed on the back side of the cover sheet 49.
The cover sheet 49 also extends to the opening of the transparent window 42 of the cover 42 and covers it flush with the transparent window plate 5.
You can also substitute 0. In that case, a liquid volume scale can be printed on the back side of the cover sheet 49.

The lower back side of the cover 41 is a liquid level detection box 51.
are integrally formed. Box 51 is shown in Fig.
As shown in FIG.
Post-stage residual amount detection means 53 consisting of a light emitting diode 53a and a light receiving element 53b are housed vertically, and changes in the remaining amount in the inner container 2 are detected through the transparent tube 17b.

Each light emitting diode 52a, 53a and each light receiving element 52b, 53b are mounted on a printed circuit board 54.
The board 54 is placed upright on one surface, and is placed at a predetermined position within the box 51 by fitting the board 54 into the stepped portion 51a of the opening of the box 51 and screwing it in with the screws 55.

Light emitting diode 5 housed in box 51
2a, 53a and the light receiving elements 52b, 53b are the third
As shown in the figure, the transparent tube 17b
When there is no liquid inside, the light emitting diodes 52a and 53a
The light 56 from the
However, if there is liquid, the light 56 travels as shown in FIG. 4 and is detected by the light receiving elements 52b, 53b.
It doesn't reach 3b. Note that 51b is a window provided in the box 51 through which light 56 passes.

In this way, whether or not the light reaches the light receiving elements 52b and 53b can be used to detect whether there is liquid at the opposing height, and when the liquid runs out, the remaining amount will be below the opposing height. It means that it has passed. Here, each light emitting diode 52a, 53a and each light receiving element 52
b, 53b detect the presence or absence of liquid by facing each other horizontally using the difference in refraction depending on the presence or absence of liquid with respect to the transparent tube 17b.
The remaining amount state can be accurately detected without the unsightly and unsanitary procedure of putting a light-shielding float inside the tank.

A ring 41a that fits into the transparent tube 17b is integrally formed at the upper and lower ends of the resin panel 41. After fitting the transparent tube 17b with the rings 41a, 41a, the resin panel 41 and the transparent tube 1 are connected immediately adjacent to each other.
7b are attracted together by a rubber band 95, and together with the high frictional properties of the rubber band 95, the transparent tube 17b is prevented from coming off from the resin panel 41, so that both can be handled as a unit at the assembly stage.

A thermistor 63 is attached to a recessed portion 61 provided at the back of the inner container 2 using a mounting plate 33, and a temperature fuse 60 is attached to the bottom of the inner container 2.

When the front stage remaining amount display means 52 detects a predetermined front stage remaining amount state, the remaining amount display section 48 is turned on, and when the rear stage remaining amount display means 53 detects a predetermined rear stage remaining amount state, a buzzer 65 is activated.

A series of controls such as energization control of the heater 1, determination of the remaining amount detection, and corresponding display are performed by a microcomputer (hereinafter referred to as microcomputer) 66. The microcomputer 66 is the CPU
It is sufficient to have a ROM, and the circuit board 67 is equipped with other necessary circuit parts.

The board 67 is integrally formed with a part of an annular bottom plate (bottom member) 68 attached to the lower end of the outer case 3, and is housed from below in a microbox 69 having an opening 69b opening downward, and is screwed with a screw 70. A heat shield plate 72 which is fixed and covered from above is also fixed with screws 73. The top plate 69a of the microbox 69 has four spacer protrusions 71 on its lower surface for screwing the board 67, and four spacer protrusions 73 for attaching the heat shield plate 72 on the top surface, which are the same as the spacer protrusions 71. located at the location.

The screws 70 of the board 67 are fastened using the three spacer protrusions 71 and 73 so as not to penetrate from the bottom to the top.
2 has a skirt wall 72a that fits around the outer periphery of the microbox 69, and is mounted by making a hole 72b formed in the skirt wall 72a elastically engage with an engaging claw 69c formed on the outer periphery of the microbox 69,
In order to stabilize the installation, the spacer protrusions 71 and 73 at other locations are used to prevent the screws from penetrating from above to below, and are screwed together with screws 74. As a result, the microbox 69 has no upper or lower penetrating parts, and even if overflow flows down from above, it will not enter the microbox 69, and the electronic circuits installed on the board 67 inside the microbox 69. can be protected from said overflow.

A heat insulating material 78 is wrapped around the outside of the upper half of the inner container 2, and a heat shield plate 75 is provided around the outside of the lower half. The heater 1 is housed in a band-like case 76 and wrapped around the inner container 2, but since the heater 1 itself is usually only provided in the range X shown in FIG. A heat plate 75 is provided, and a bottom heat shield plate 77 is also provided at the folded portion of the heat shield plate 75 toward the lower side of the inner container 2.

As a result, the board 67 absorbs heat from the heater 1 through the folded portion of the heat shield plate 75, the bottom heat shield plate 77, the heat shield plate 72, the microbox 69, and the air layer between them. shielded and provided with sufficient thermal protection.

The heat shield plate 75 and the bottom heat shield plate 77 are simultaneously attached with screws 81 along with a mounting plate 80 of the temperature fuse 60 to a mounting bracket 79 attached to the bottom of the inner container 2 by welding or the like. Note that by attaching with the screws 81, another heat shield plate 72 can also be attached as shown in the imaginary line. In that case, spacer ring 82
It is recommended to use

As shown in FIG. 6, the microbox 69 is
It is provided at a position away from the range X in which the heater 1 is provided, so that it is also protected from the thermal influence from the heater 1. The same method may be used even in cases where the heater 1 is provided unevenly on the bottom surface of the inner container 2.

Control circuit 91 including a circuit on microcomputer board 67
is as shown in the block diagram shown in FIG. 7, and is connected to various external electronic components and operating components necessary for the microcomputer 66.

Now, a series of control operations will be explained according to the control flowchart shown in FIG. 8. When the power is turned on, necessary initial settings are performed in step #1, and then
Move to step #2, activate the buzzer 65,
The start of heating is indicated externally with a “pitsu” sound,
Notifies the user of the start of use of the electric pot and urges caution in handling it thereafter. Next, in step #3, it is determined whether the content liquid is empty or not based on whether or not the latter-stage remaining amount detection means 53 detects the content liquid. It should be noted that even when the latter remaining amount detection means 53 no longer detects the content, it takes some time until an appropriate amount remains and a safe empty cooking state is reached. If it is not empty, move from step #4 to step #12, determine whether the electric pot is safe to use and take necessary preparations, and if it is not, return to step #1 and start from the beginning. The flow is repeated.

If it can be used, the process moves to step #13, and the preliminary remaining amount detection means 52 determines whether the content liquid is above the water supply line.
This is determined based on whether or not it detects the liquid content. If the pre-stage remaining amount detection means 52 does not detect the content liquid, it is below the water supply line, and the process moves to step #14, where the water supply display section 47 is turned on to externally display that the water supply has reached the required remaining amount. , after prompting water supply, proceed to step #16.

If the water supply line has not been reached, proceed to step #15, turn off the water supply display section 47, and step #16.
to move to.

In step #16, the empty buzzer flag is set to "0", and then the process moves to step #17, where it is determined whether the reboiling switch 44 is on. If the re-boiling switch 44 is on, the buzzer 65 is activated in step #18 and a beep is sounded to externally display the response, and the boiling flag is set to "1" in step #19, and the process proceeds to step #20. to move to. If the reboiling switch 44 is off, steps #18 and #19 are not executed and the process immediately proceeds to step #20.

In step #20, it is determined whether the thermistor 63 detects a predetermined temperature. If not detected, proceed to step #21 and the boiling flag will be set to “1”.
If it is “1”, it will be “1” as it is.
If not, move on to step #22 and set thermistor 6.
3 is below the boiling temperature, the process moves to step #23, and the main heaters 1a, 1a of heater 1,
Both sub-heaters 1b are turned on. After this, in step #24, the boiling display section 45 is turned on to externally display that the boiling state is being used, and the heat retention display section 4
Turn off 6.

Next, the process moves to step #25, and it is determined whether the steam sensor 37 is below the boiling temperature. If the temperature is below, the process moves to step #3 and heating for boiling is repeated. If the temperature is higher than the boiling temperature in step #25, the process moves to step #26, where the main heater 1a and sub-heater 1b are turned off, the boiling flag is set to "0" in step #27, and the boiling display section 47 is made to blink in step #28. At the same time, the buzzer 65 is activated to make "pitsu" and "pitsu" sound five times, and an external display is displayed to indicate that the boiling state has been reached. After this, the process moves to step #3.

If the thermistor 63 is at the predetermined temperature in step #20, the process goes to step #31, where the main heater 1a and sub-heater b are turned off, and then the process goes to step #32, and only if the boiling flag is "1", the process goes to step #31. After proceeding to step #33 and turning off the heat retention display section 46, proceeding to step #25 to perform boiling processing.

If the boiling flag is not "1" in step #32, it means that the temperature is kept warm, so the process goes to step #34, where the boiling display section 45 is turned off and the heat retention display section 46 is turned on to externally display that the temperature is kept warm. Next, in step #35, it is determined whether the thermistor 63 is at or above a predetermined temperature, and if it is below, the sub-heater 1b is turned on in step #36, and if it is above, the process moves directly to step #37, and the thermistor 63 is at or below the predetermined temperature. If so, the process goes to step #38, where the sub-heater 1b is turned off, and then the process goes to step #3, where the heat retention state is repeated.

When it is determined in step #3 that the content liquid is empty, the process moves to step #41, and only when it is determined that the liquid is empty a predetermined number of times in succession, the process moves to step #42, where the boiling indicator 45 and the heat retention are activated. After turning off the display section 46 and water supply display section 47, the main heater 1a and sub-heater 1b are turned off in step #43, and then the water supply display section #4 is turned off in step #44.
7 is flashed to externally display the empty state when it is visually displayed.

Next, in step #45, it is determined whether the empty buzzer flag is "1" or not. If it is not "1", the buzzer 65 is activated in step #46 to continuously sound "pitsu" and "pitsu", and in step #47, the buzzer 65 is activated. After setting the empty buzzer flag to "1", the process returns to step #3. If the empty buzzer flag is "1" in step #45, the process returns to step #3.

In the embodiment shown in FIGS. 9 and 10, a liquid level detection box 5 is provided almost below the window 42 of the resin panel 21.
1, and a recess 51c is formed for receiving the lower end of the transparent tube 17b of the outlet path 17 and the portion below it bent toward the inner container 2, as shown in FIG. This has the advantage that the lower part of the lead-out portion 17 can be directly positioned by the recess 51c.

(Effects of the invention) According to the invention, since the electronic circuit board is stored and installed in the storage chamber integrally formed in the bottom member of the exterior body, no special member is required for installing the electronic circuit board. Moreover, the storage chamber accommodates and installs the electronic circuit board through the board entry/exit opening facing the outside of the agent layer body, so that the electronic circuit board can be protected from the influence of heat and water leakage from above. Further, protection from thermal influences is further enhanced by a heat shield plate provided on the top plate of the electronic circuit board.

Therefore, installing the electronic circuit board under the bottom of the content base is a simple structure with a small number of parts.
This is achieved with sufficient safety against heat from the heater and water leakage.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a perspective view of the liquid level display section, Figs. 3 and 4 are cross sectional views of the front remaining amount detection section, and Fig. 5 is Fig. 2 is a perspective view of a part of the control circuit as seen from the front side, Fig. 6 is a plan view of the bottom plate, Fig. 7 is a block diagram of the control circuit, Fig. 8 is a control flowchart, and Figs. 9 and 10 are FIG. 7 is a perspective view and a cross-sectional view of a portion of a modified example of the liquid amount display section. 2... Inner container, 3... Exterior body, 67... Board,
68...Bottom plate, 69...Storage chamber, 69a...Top plate, 69b...Intake/exit opening, 71, 73...Spacer protrusion, 72...Heat shield plate.

Claims (1)

[Scope of utility model registration request] A bottom frame member of an exterior body housing an inner container provided with a heater is provided with a downwardly opened storage box that protrudes from the opening of the bottom frame member and is located below the inner container to house an electronic control board. By applying the heat shield plate and the electronic control board to screw bosses formed integrally on the upper and lower surfaces of the top plate of this storage box, respectively, and screwing them to the applied bosses. , each of the heat shield plate and electronic control board using each boss as a spacer,
An electric hot water storage container characterized in that a gap is provided between the top plate and the top plate.