CN112294141A - Thermos bottle with water level indicator - Google Patents

Thermos bottle with water level indicator Download PDF

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Publication number
CN112294141A
CN112294141A CN202011153774.XA CN202011153774A CN112294141A CN 112294141 A CN112294141 A CN 112294141A CN 202011153774 A CN202011153774 A CN 202011153774A CN 112294141 A CN112294141 A CN 112294141A
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China
Prior art keywords
water level
circuit box
pin
cpu
bottle
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CN202011153774.XA
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Chinese (zh)
Inventor
孙逊
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Shanghai Institute of Technology
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Shanghai Institute of Technology
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Priority to CN202011153774.XA priority Critical patent/CN112294141A/en
Publication of CN112294141A publication Critical patent/CN112294141A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J41/00—Thermally-insulated vessels, e.g. flasks, jugs, jars
    • A47J41/02—Vacuum-jacket vessels, e.g. vacuum bottles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G05B19/0425—Safety, monitoring

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Food Science & Technology (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Closures For Containers (AREA)

Abstract

The invention relates to a thermos bottle with a water level indicator.A circuit box is arranged in a bottle cap, the rear end of the bottle cap is connected with a bottle shell at the opening of the bottle by a hinge, a permanent magnet static block is embedded in the bottle shell below the hinge, and a permanent magnet moving block is embedded in the bottle cap at the tail end of the hinge; the external thread of the convex hole in the center of the bottom surface of the circuit box is in threaded connection with the internal thread of the concave hole in the center of the plug head, and the ultrasonic sensor is arranged in the convex hole; when the bottle cap is closed, an ultrasonic sensor in the through hole of the circuit box measures the water level, and the CPU converts the measured water level into an LED light band for length display; when the bottle cap is erected during water filling, the permanent magnet movable block in the bottle cap and the permanent magnet static block on the bottle shell are tightly sucked, so that the bottle cap is not toppled, meanwhile, the CPU drives the vertical electromagnet to be tightly sucked with the permanent magnet stop block in the bottle cap through the wall of the circuit box, the circuit box is clamped and fixed, water filling sound detected by the sound sensor arranged in the through hole of the circuit box facing the bottle opening is extracted by the CPU, a tone signal representing the water level is extracted, and the LED light band is driven to indicate the height of the water level.

Description

Thermos bottle with water level indicator
Technical Field
The invention relates to a thermos bottle, in particular to a thermos bottle with a water level indicator at the top of a bottle shell for old people and children.
Background
The old people usually have weak physical strength and slow response, and the children usually have weak physical strength and lack the experience of doing housework, so when the children look down into the boiled water from a common household thermos bottle placed on the ground, the children are often inconvenient to check the water level in the bottle to cause the overhigh water level in the bottle and even overflow; when they pour out hot water, they sometimes scald the body because of high water level in the bottle and hard pouring water, even splashing hot water on the body.
Some conventional water level indicating thermos bottles adopt side surfaces to indicate the water level, but the water level is not convenient to look down and observe in the irrigation process; some bottles are internally provided with a water level meter to directly measure the water level, but the total capacity of the inner container is reduced; some thermos bottles adopt a pressure sensor at the bottom to measure the water level, but the pressure value at the bottom of the thermos bottle is related to the inner container, the water level and a bottom screw, the pressure is high when the bottom screw is screwed down, and the pressure is low when the bottom screw is loosened, so that the water level measurement error can be caused.
Therefore, there is a need for a thermos that is clearly aware of the current water level from a top view.
Disclosure of Invention
The invention provides a thermos bottle with a water level indicator, aiming at the potential safety hazard caused by the difficulty in directly knowing the water level of a common household thermos bottle by old people and children at present.
The technical scheme of the invention is as follows: a thermos bottle with water level indication comprises an inner container, a bottle shell, a bottle cap, a plug and a circuit box, wherein the circuit box is installed in the bottle cap, the rear end of the bottle cap is connected with the bottle shell at the bottle opening through a hinge, permanent magnet static blocks with magnetic poles distributed up and down are longitudinally embedded in a bottle shell reinforcing bar below the hinge, the magnetic poles are embedded in the bottle cap at the tail end of the hinge and distributed up and down, and a pair of permanent magnet dynamic blocks with magnetic attraction dynamic contacts exposed are arranged on the bottom surfaces of the magnetic poles; the circuit box comprises a control circuit, an ultrasonic sensor, a sound sensor, an LED light band, a vertical electromagnet and a closed electromagnet, wherein the control circuit consists of a CPU (central processing unit), an operational amplifier, a light band driver and a resistor, a convex hole external thread at the center of the bottom surface of the circuit box is in threaded connection with a concave hole internal thread at the center of a plug head, the plug head is installed and fixed at the bottom of the circuit box, the ultrasonic sensor is arranged in the convex hole and is tightly attached to the bottom surface of the concave hole of the plug head, and the water level in the bottle right below the plug head can be detected by separating the bottom surface; when the bottle cap is closed, the CPU receives a data signal sent by the ultrasonic sensor, calculates the water level by combining the preset height of the inner container and the wave speed, converts the water level into the voltage output of a pin DA of the digital-to-analog conversion output end of the water level, and drives the LED light band to emit light to indicate the water level; when water is filled, the bottle cap is erected, the permanent magnet movable block behind the bottle cap and the permanent magnet fixed block on the reinforcing bar of the bottle shell are tightly attracted by magnetic force, so that the bottle cap is not toppled, meanwhile, the CPU in the circuit box drives the vertical electromagnet to tightly attract the permanent magnet stop block embedded in the bottle cap through the wall of the circuit box, the circuit box is clamped and fixed by the attraction, the water filling sound detected by the directional sound sensor arranged in the circuit box through hole facing the bottle opening is extracted by the CPU, and the tone signal representing the water level is extracted by the CPU to drive the LED light band to indicate the height of the water level.
Furthermore, the front side and the rear side of the circuit box are inserted into a front coaxial shaft hole and a rear coaxial shaft hole on the inner side of the bottle cap through a front rotating shaft and a rear rotating shaft respectively, and the central lines of the front rotating shaft and the rear rotating shaft are superposed, so that the circuit box is installed on the inner side of the bottle cap in a hanging manner, the rear rotating shaft is a hollow shaft communicated with a control circuit, and the control circuit is connected with a pair of magnetic attraction moving contacts at the bottom of a permanent magnet moving block outside the circuit box through two wires laid in the hollow shaft.
Furthermore, the bottle cap, the bottle shell, the circuit box and the front rotating shaft and the rear rotating shaft thereof are made of transparent engineering plastics, so that light emitted by the LED light band can pass through the transparent engineering plastics to be observed by a user; the surfaces of the front rotating shaft and the rear rotating shaft of the circuit box and the shaft holes at the front side and the rear side of the bottle cap are mirror smooth; the outer surface of the plug head which is contacted with the mouth of the liner is a flexible plastic cambered surface.
Furthermore, a longitudinal reinforcing bar is arranged on the bottle shell below the hinge, cuboid permanent magnet static blocks with magnetic poles distributed up and down and conductive rubber sheets stuck to the side surfaces are longitudinally embedded in the reinforcing bar, and the conductive rubber sheets are flush with the outer surface of the reinforcing bar and exposed.
Furthermore, one end of the pair of magnetic attraction moving contacts is connected with zero potential, and the other end is connected with I of a CPU in the control circuit2The pin, when the bottle lid is opened to vertical position, the permanent magnetism movable block along with the bottle lid rotation with the static piece of permanent magnetism is close to by opposite magnetic pole looks attraction, a pair magnetism of permanent magnetism movable block is inhaled the movable contact and is oppressed by this suction on the conductive rubber piece, this suction even makes the bottle lid oppressed solidIs fixed at a vertical position, and leads the pair of magnetic attraction contacts to be short-circuited by a conductive rubber sheet, and then the I is positioned2The pin inputs low level, otherwise I2The pin is set high by the circuit hardware.
Furthermore, when the bottle cap is closed, the bottom surface of the circuit box is horizontal, the shape of the circuit box above the plug head, which is cut by a plane perpendicular to the axes of the front rotating shaft and the rear rotating shaft, is stepped, one side in the middle of the circuit box is provided with a groove longitudinal wall and a transverse wall perpendicular to the groove longitudinal wall, the S magnetic pole of the cuboid permanent magnet stop block embedded in the inner side of the bottle cap is tightly attached to the outer side of the groove longitudinal wall, the top end of the inner side of the groove longitudinal wall is provided with a closed electromagnet and an LED light band, the top end of the inner side of the groove transverse wall is provided with a vertical electromagnet2The pins are high-level, the distance between the axes and the stepped top surface, and the distance between the axes of the front rotating shaft and the rear rotating shaft and the plane of the outer surface of the transverse wall of the stepped groove are sequentially equal to the projection distance between the axes and the top end of the transverse wall of the groove in the horizontal projection of the circuit box, and the projection distance between the axes and the outer surface of the N magnetic pole of the permanent magnet stop block is equal; when CPU instruction O2The pin outputs high level to make the operational amplifier output the driving current i1The tops of the closed electromagnet and the vertical electromagnet are both N magnetic poles, the N magnetic pole at the top of the closed electromagnet is attracted with the S magnetic pole of the permanent magnet stop block, and the longitudinal wall of the groove of the circuit box is vertically clamped between the permanent magnet stop block and the closed electromagnet by the attraction, so that the circuit box, the plug head, the front rotating shaft and the rear rotating shaft are completely fixed; when the bottle cap is vertical, the I of the CPU2Pin input low level, CPU instruction O2Low level of pin output to make operational amplifier output inverted current i2I.e. i2＝-i1The top that leads to closing position electro-magnet and vertical position electro-magnet all is the S magnetic pole, the S magnetic pole at closing position electro-magnet top repels with the S magnetic pole of permanent magnetism dog, the torque that this repulsion lead to makes the circuit box drive the chock plug around preceding pivot and back pivot, do the rotary motion who deviates from the permanent magnetism dog, and simultaneously, the recess transverse wall is then because of rotatory N magnetic pole that is close to the permanent magnetism dog, the N magnetic pole at permanent magnetism dog and the S magnetic pole at vertical position electro-magnet top attract mutually, rotatory to vertical to the S magnetic pole at vertical position electro-magnet top when this recess transverse wallWhen the circuit box rotates by 90 degrees, the transverse wall of the groove is tightly attached to the permanent magnet stop block, and the transverse wall of the groove of the circuit box is firmly clamped between the permanent magnet stop block and the vertical electromagnet by the suction force, so that the circuit box, the plug head, the front rotating shaft and the rear rotating shaft are completely fixed again; if the I of the CPU2The pin is input again at high level, then the CPU instruction O2The pin outputs a high level again, so that the circuit tape cassette, the plug head and the front and rear rotating shafts are fixed again after being reversed by 90 degrees.
Further, O of the CPU1Pin and I1The pins are respectively connected with a trigger end Trig pin and a response end Echo pin of the ultrasonic sensor; i of CPU2After the pin reaches high level, CPU delays for 3s to close the bottle cap, and then CPU instructs O1Triggering starting pulse sent by the pin, reflecting Echo for the first time when ultrasonic wave sent by the ultrasonic sensor passes through the bottom of the plug head, reflecting Echo for the second time when the ultrasonic wave reaches the water surface in the bottle, and serially sending a time difference signal of the received Echo for the second time to the I of the CPU through an Echo pin of the ultrasonic sensor1And the pin and the CPU calculate the water level according to the time difference and by combining the preset height of the inner container and the wave speed, and convert the water level into the voltage output of the pin DA of the digital-to-analog conversion output end of the pin.
Furthermore, when the bottom surface of the circuit box is horizontal, a through hole is formed in the center of the other vertical wall opposite to the vertical wall of the groove, and an output end Signal pin of the directional sound sensor installed in the through hole is connected with an analog-digital conversion end AD pin of the CPU; when the circuit box rotates by 90 degrees, the sound sensor transmits collected sound right in front outside the hole to the AD pin of the CPU for receiving, the CPU extracts tone signals representing the water level from the sound sensor, compares the signals with a plurality of preset tone water level corresponding curves in the ROM in real time to determine the current water level, and converts the water level into the DA pin voltage of the CPU for outputting.
Further, the DA pin of the CPU is connected to a SIG pin of a signal end of the optical tape driver, and the optical tape driver sequentially lights the LEDs in the optical tape according to the level of the SIG pin.
The invention has the beneficial effects that:
the thermos bottle with water level indication adopts a method that a circuit box capable of rotating reciprocally by 90 degrees is arranged in a bottle cap, and an ultrasonic sensor and a sound sensor are respectively arranged on two vertical surfaces of the circuit box. When water is filled, the bottle cap is kept vertical and does not topple under the action of the magnetic force between the permanent magnetic moving block and the permanent magnetic static block, and the CPU drives the LED light band to indicate the water level height according to the output signal of the sound sensor facing the bottle mouth in the circuit box.
In the manual bottle cap closing process, the permanent magnet moving block and the permanent magnet static block are separated instantly, the ultrasonic sensors in the plug and the circuit box turn to the bottle mouth, the CPU delays for 3s to wait for the old and children to close the bottle cap, the bottle mouth is plugged by the plug, and then the CPU drives the LED light band to indicate the water level height according to the output signal of the ultrasonic sensors.
The thermos bottle with the water level indication of the invention avoids the contact of a circuit and water through the instantaneous switching of the electromagnetic mechanism, and enables the sound sensor to detect the water filling sound, so that the ultrasonic sensor detects the water stored in the thermos bottle, and indicates the approximate water level in the thermos bottle by the length of the light band, thereby prompting the old and children to use the thermos bottle safely.
Drawings
FIG. 1 is a circuit diagram of the present invention;
figure 2 is a schematic view in partial longitudinal section of the closure according to the invention;
FIG. 3 is a schematic top view, partially in section, taken along line A-A of the present invention;
FIG. 4 is a schematic view in partial section taken along line B-B of the present invention (with the cap removed);
fig. 5 is a vertical partial longitudinal sectional view schematically illustrating the bottle cap according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 5, the thermos bottle with water level indication of the present invention comprises a bottle cap 1, a circuit box 2, a closed electromagnet 3, a permanent magnet stopper 4, an LED light band 5, a control circuit 6, a rear rotating shaft 7, a permanent magnet moving block 8, a magnetic moving contact 9, a bottle cap rotating shaft 10, a permanent magnet static block 11, a conductive rubber sheet 12, a reinforcing bar 13, a handle 14, an inner container 15, a stopper 16, a groove longitudinal wall 17, an ultrasonic sensor 18, a convex hole 19, a vertical electromagnet 20, a bottle shell 21, a front rotating shaft 22, a sound sensor 23, a groove transverse wall 24 and a water retaining edge 25.
The bottle cap 1 is internally provided with a circuit box 2. The circuit box 2 comprises an LED light band 5, a control circuit 6, an ultrasonic sensor 18, a closed electromagnet 3, a vertical electromagnet 20 and a sound sensor 23.
The external thread of a convex hole 19 in the center of the horizontal bottom surface of the circuit box 2 is in threaded connection with the internal thread of a concave hole in the center of a plug 16, the plug 16 is installed and fixed at the bottom of the circuit box 2, an ultrasonic sensor 18 is installed in the convex hole 19, the ultrasonic sensor 18 in the convex hole 19 is tightly attached to the bottom surface of the concave hole of the plug 16, and the water level in the bottle right below the plug is detected through the bottom surface. The front side and the rear side of the circuit box 2 are respectively provided with a front rotating shaft 22 and a rear rotating shaft 7 which are protruded, the central lines of the front rotating shaft 22 and the rear rotating shaft 7 are overlapped, and the circuit box 2 is hung and installed on the inner side of the bottle cap 1 through the front rotating shaft 22 and the rear rotating shaft 7.
One side of the middle of the circuit box 2 is provided with a groove longitudinal wall 17 and a transverse wall 24 vertical to the groove longitudinal wall 17, and the groove longitudinal wall 17 is a vertical plane, namely the circuit box 2 is in a step shape. The sound sensor 23 is mounted in a through hole in the center of the side wall of the circuit box 2 facing the vertical wall 17 of the recess. The side where the sound sensor 23 is located is turned to the opening facing the inner container 15, sound in the front is received through a through hole of the circuit box 2 in the front, the sound is converted into an electric signal and transmitted to an AD pin of a CPU in the control circuit 6 for receiving, the CPU extracts tone signals representing the water level from the sound, the signals are compared with a plurality of preset tone water level corresponding curves in the ROM in real time, the current water level is determined, the water level is converted into DA pin voltage output of the CPU, and the LED light band is driven to emit light to indicate the water level. The CPU in the control circuit 6 calculates the water level according to the data sent by the ultrasonic sensor 18 connected with the CPU by combining the preset height of the inner container and the wave speed, converts the water level into the voltage output of the pin DA of the digital-to-analog conversion output end of the water level, and drives the LED light band to emit light to indicate the water level.
The rear end of the bottle cap 1 is connected with a bottle shell 21 of a bottle opening through a hinge, a longitudinal reinforcing bar 13 is arranged on the bottle shell 21 below the hinge, a cuboid permanent magnet static block 11 with magnetic poles distributed up and down and conductive rubber sheets 12 adhered to the side faces is longitudinally embedded on the longitudinal reinforcing bar, the conductive rubber sheets 12 are parallel and level with the outer surface of the reinforcing bar and exposed, and a permanent magnet dynamic block 8 with magnetic poles distributed up and down and a pair of magnetic attraction dynamic contacts 9 is arranged on the bottom face of the magnetic poles is longitudinally embedded in the bottle cap 1 at the tail end of the hinge.
The permanent magnet stop block 4 is embedded into the inner side of the bottle cap 1, when the bottle cap is closed, the S magnetic pole of the permanent magnet stop block 4 is tightly attached to the outer side of the groove longitudinal wall 17 in the circuit box 2, the closed electromagnet 3 and the LED light band 5 are installed at the top end of the inner side of the groove longitudinal wall, the vertical electromagnet 20 is installed at the top end of the inner side of the groove transverse wall 24, the N magnetic pole at the top of the closed electromagnet 3 is attracted with the S magnetic pole of the permanent magnet stop block 4, the suction force firmly clamps the groove longitudinal wall 17 between the permanent magnet stop block 4 and the closed electromagnet 3, and the complete fixation of the circuit box 2, the plug 16, the front rotating shaft 22 and the.
FIG. 1 is a circuit diagram of the present invention with control circuitry in dashed boxes consisting of a CPU, operational amplifier, tape driver and resistor.
Variable resistor RwThe movable end of the operational amplifier is connected with the inverting end of the operational amplifier, and the potential V of the end is adjustedN≈0.5VDD. Only when the magnetic moving contact J is closed, namely the bottle cap is vertical, the I of the CPU2The pin has zero level input, otherwise, the I2The pin is composed of positive power supply + VDDThrough a resistance R1A high level is provided.
When the I of the CPU2At the moment when the pin reaches high level, the CPU instructs O on the one hand2The pin outputs high level, the operational amplifier is saturated, and the output out pin outputs current i1The current flows from the out pin to zero potential, the tops of the closed electromagnet and the vertical electromagnet are driven to generate N magnetic poles, and the bottom of the closed electromagnet and the bottom of the vertical electromagnet are provided with S magnetic poles; on the other hand, the CPU delay 3s is used for the user to close the vertical cap, then the CPU commands O1Trigger starting pulse that pin sent to ultrasonic sensor's Trig pin makes ultrasonic sensor send the ultrasonic wave, and first reflection Echo when it passes through cock head bottom, second reflection Echo when the ultrasonic wave reaches bottle normal water, ultrasonic sensor is with the time difference signal of this secondary reflection Echo of its receipt, through ultrasonic sensor's Echo pin series is sent to CPU's I1And the pin and the CPU calculate the water level according to the time difference and by combining the preset height of the inner container and the wave speed, and convert the water level into the voltage output of the pin DA of the digital-to-analog conversion output end of the pin.
The hot water with the temperature of 98 ℃ is usually kept for 24 hours in a 3.2 liter thermos bottle with the caliber of 4cm, the water temperature is more than or equal to 72 ℃, so the wave speed error caused by presetting the wave speed at 85 ℃ in a CPU is less than +/-2.5 percent.
When I is2When the pin is low, CPU instruction O2Pin output low level, operational amplifier negative saturation, out pin output inverse current i2≈-i1The driving closed electromagnet and the vertical electromagnet both have S magnetic poles at the top and N magnetic poles at the bottom. And then, an AD pin of an analog-digital conversion end of the CPU acquires a Signal of a Signal pin at the output end of the directional sound sensor in real time, and the CPU extracts a tone Signal representing the water level from the Signal and converts the water level into the voltage of a DA pin of a digital-analog conversion end of the CPU to be output.
The voltage of the DA pin of the CPU is output to the Sig pin of the input end of the light band driver, when the water level is high, the light band is long, and when the D pin of the LED light band is1～D4Sequentially lightening one by one, namely, the water level in the bottle is changed from low to high, and the full lightening prompts to stop water filling.
Fig. 2 is a schematic view of a closed partial longitudinal section of the bottle cap of the present invention, wherein the circuit box 2 comprises an LED light strip 5, a control circuit 6, an ultrasonic sensor 18, a closed electromagnet 3, a vertical electromagnet 20 and a sound sensor 23, the bottom surface of the circuit box 2 is horizontal, the external thread of the convex hole 19 at the center of the bottom surface is in threaded connection with the internal thread of the concave hole at the center of the plug 16, the plug 16 is installed and fixed at the bottom of the circuit box 2, and the ultrasonic sensor 18 in the convex hole 19 is tightly attached to the bottom surface of the concave hole of the plug 16 to detect the water level in the bottle right below the bottom surface. The central lines of the front rotating shaft 22 and the rear rotating shaft 7 respectively protruding out of the front side surface and the rear side surface of the circuit box 2 are superposed, the two rotating shafts are respectively inserted into a front coaxial shaft hole and a rear coaxial shaft hole inside the bottle cap 1, so that the circuit box 2 is installed inside the bottle cap 1, the rear rotating shaft 7 of the circuit box 2 is a hollow shaft communicated with a control circuit 6, and two wires laid inside the hollow shaft connect the control circuit 6 inside the box with a magnetic movable contact 9 outside the box; the rear end of the bottle cap 1 is connected with a bottle shell 21 of a bottle opening through a hinge, the upper page and the lower page of the hinge are respectively a part of the bottle cap and a part of the bottle shell, a longitudinal reinforcing bar 13 is arranged on the bottle shell 21 between the lower part of the hinge and the upper part of a handle 14, a cuboid permanent magnet static block 11 with magnetic poles distributed up and down and a conductive rubber sheet 12 stuck on the side surface is longitudinally embedded on the longitudinal reinforcing bar, the conductive rubber sheet 12 is parallel and level with the outer surface of the reinforcing bar and is exposed, and a permanent magnet dynamic block 8 with magnetic poles distributed up and down and a pair of magnetic attraction dynamic contacts 9 is arranged on the bottom surface of the magnetic poles in.
The circuit box 2 is provided with a vertical wall 17 with a shorter side and a transverse wall 24 with a shorter side perpendicular to the vertical wall 17, the vertical wall 17 is a vertical plane, namely the circuit box 2 is in a step shape, an S magnetic pole of a permanent magnetic stop 4 embedded in the inner side of the bottle cap 1 is tightly attached to the outer side of the vertical wall 17 of the stepped groove, the top end of the inner side of the vertical wall of the groove is provided with a closed electromagnet 3 and an LED light band 5, and the top end of the inner side of the transverse wall 24 of the groove is provided with a vertical electromagnet 20.
The bottle cap 1, the bottle shell 21, the circuit box 2 and the front rotating shaft 22 and the rear rotating shaft 7 thereof are made of plastic materials, wherein the wall of the circuit box 2 and the front rotating shaft 22 and the rear rotating shaft 7 thereof are made of integrated transparent engineering plastics, LED light can penetrate through the transparent engineering plastics to be observed by a user, and the surfaces of the front rotating shaft 22 and the rear rotating shaft 7 of the circuit box 2 and the front side shaft hole and the rear side shaft hole of the bottle cap 1 are smooth in mirror surface.
The outer surface of the plug 16 at the contact part with the opening of the liner 15 is a flexible plastic cambered surface.
The CPU calculates the water level according to the data sent by the ultrasonic sensor by combining the preset height of the inner container and the wave speed, converts the water level into the voltage output of a pin DA of the digital-to-analog conversion output end of the water level, and drives the LED light band to emit light to indicate the water level.
Fig. 3 is a schematic sectional top view of a part of a direction a-a of the present invention, and a plug 16 right below the circuit box 2 blocks the opening of the inner container 15 to keep warm of hot boiled water.
The central lines of the front rotating shaft 22 and the rear rotating shaft 7 respectively protruding out of the front side surface and the rear side surface of the circuit box 2 are superposed, and the two rotating shafts are respectively inserted into the front coaxial shaft hole and the rear coaxial shaft hole on the inner side of the bottle cap 1, so that the circuit box 2 is installed on the inner side of the bottle cap 1.
The S magnetic pole of the permanent magnet stop block 4 embedded in the inner side of the bottle cap 1 is tightly attached to the outer side of the groove longitudinal wall 17, the closed electromagnet 3 and the LED light band 5 are installed at the top end of the inner side of the groove longitudinal wall, the vertical electromagnet 20 is installed at the top end of the inner side of the groove transverse wall 24, the N magnetic pole at the top of the closed electromagnet 3 is attracted to the S magnetic pole of the permanent magnet stop block 4, the groove longitudinal wall is firmly clamped between the permanent magnet stop block 4 and the closed electromagnet 3 through the attraction, and the circuit box 2, the plug 16 and the front rotating shaft and the rear rotating shaft are completely fixed.
The ultrasonic sensor 18 is located at the center of the bottom of the circuit box 2, and detects the water level in the bottle right below. The side wall of the circuit box where the sound sensor 23 is installed faces the vertical wall 17 of the recess, that is, the sound sensor circuit 23 is not in contact with water when the ultrasonic sensor 18 measures the water level.
Fig. 4 is a schematic view in partial section from B-B (with the cap removed) of the present invention, when the cap is closed, i.e., when the bottom surface of the circuit box 2 is horizontal. The circuit box is in a step shape by being cut by a plane vertical to the axes of the front rotating shaft 22 and the rear rotating shaft 7, the distance between the axis and the top surface of the step shape and the distance between the axis and the plane where the outer surface of the transverse wall 24 of the groove is located are sequentially equal to the projection distance between the axis and the top end of the transverse wall 24 of the groove and the projection distance between the axis and the outer surface of the N magnetic pole of the permanent magnet stop block 4 in horizontal projection of the circuit box 2.
An ultrasonic sensor 18 is arranged in a central hole of a bottom plate of the circuit box 2, a stepped groove longitudinal wall 17 is a vertical plane, a groove transverse wall 24 is horizontal, an S magnetic pole of a cuboid permanent magnet stop 4 embedded in the inner side of the bottle cap 1 is tightly attached to the outer side of the groove longitudinal wall 17, a closed electromagnet 3 and an LED light band 5 are arranged at the top end of the inner side of the groove longitudinal wall, a control circuit 6 is arranged at the lower part of the inner side of the longitudinal wall, a directional sound sensor 23 is arranged on the side wall of the circuit box 2 opposite to the longitudinal wall, and a vertical electromagnet 20 is arranged at the top end of the inner side of the groove transverse wall 24.
The top parts of the illustrated closed electromagnet 3 and the illustrated vertical electromagnet 20 both present N magnetic poles, the N magnetic pole at the top part of the closed electromagnet 3 is attracted with the S magnetic pole of the permanent magnet stop 4, and the attraction clamps the groove longitudinal wall 17 of the circuit box 2 between the permanent magnet stop 4 and the closed electromagnet 3, so that the circuit box 2, the plug 16, the front rotating shaft 22 and the rear rotating shaft 7 are completely fixed.
If the bottle cap is opened, the control circuit 6 commands the two electromagnets to have opposite currents, which causes the tops of the closed electromagnet 3 and the vertical electromagnet 20 to present an S magnetic pole, thereby causing the S magnetic pole at the top of the closed electromagnet 3 to repel the S magnetic pole of the permanent magnet block 4, the torque caused by the repulsion force enables the circuit box 2 to rotate around the front rotating shaft 22 and the rear rotating shaft 7 and depart from the permanent magnet block 4, the groove transverse wall 24 is close to the N magnetic pole of the permanent magnet block due to rotation, the N magnetic pole of the permanent magnet block is attracted with the S magnetic pole at the top of the vertical electromagnet, when the groove transverse wall 24 rotates to the vertical position, when rotating 90 degrees promptly, recess lateral wall 24 is inhaled with permanent magnetism dog 4 and is pasted closely mutually, and this attraction presss from both sides the recess lateral wall 24 of circuit box 2 firmly between permanent magnetism dog 4 and vertical position electro-magnet 20, makes circuit box 2 whole again fully fixed.
Fig. 5 is a schematic vertical partial longitudinal sectional view of the bottle cap of the present invention, wherein the permanent magnet moving block 8 in the bottle cap 1 and the permanent magnet static block 12 embedded in the reinforcement 13 are tightly attracted by the opposite magnetic poles, the attraction force keeps the bottle cap 1 vertical without falling, and the conductive rubber sheet 12 clamped between the two magnetic poles makes the magnetically attracted moving contact 9 short-circuited, and the CPU outputs an inverse current i2＝-i1So that the S pole at the top of the vertical electromagnet 20 is attracted to the N pole of the permanent magnet stopper 4, and the attraction causes the circuit box groove transverse wall 24 to cling to the permanent magnet stopper 4, i.e. the S pole of the vertical electromagnet 20 and the N pole of the permanent magnet stopper 4 clamp the circuit box groove transverse wall 24 firmly, and the circuit box 2 and the plug 16 are fixed again. The graphic circuit box 2 is rotated by 90 degrees compared with the graphic circuit box 2, the side face where the sound sensor 23 is located is rotated to face the bottle opening of the inner container 15, the sound in the front is received through a through hole of the circuit box 2 in the front of the graphic circuit box, the sound is converted into an electric signal and is transmitted to an AD pin of the CPU for receiving, the CPU extracts a tone signal representing the water level from the tone signal, the signal is compared with a plurality of tone water level corresponding curves preset in the ROM in real time to determine the current water level, the water level is converted into DA pin voltage output of the CPU, and an LED light band is driven to emit light to indicate the water level. The water retaining rim 25 is used to prevent water from entering the circuit. Usually, 3.2L thermos bottle is used for storing boiling water for 24 hours, and the water temperature is more than or equal to 72 ℃, so the boiling water is used for the purposeThe wave speed of ultrasonic waves at 85 ℃ can be preset in a CPU of the similar thermos bottle, and the wave speed error caused by the wave speed error is less than +/-2.5%.
Specific methods of use are exemplified by:
when the bottle cap 1 is closed, the bottom surface of the circuit box 2 is horizontal, the permanent magnetic moving block 8 in the bottle cap 1 at the tail end of the hinge is separated from the conductive rubber sheet 12 on the permanent magnetic static block 11 embedded on the reinforcing bar 13 below the hinge, the magnetic moving contact 9 is opened, and the I of the CPU2The pin is composed of positive power supply + VDDThrough a resistance R1A high level is obtained. CPU detects the I2At the instant of high level of the pin, on the one hand, CPU instruction O2The pin outputs high level to make the operational amplifier saturated, and the output current i of the operational amplifier out pin1The top of the driving closed electromagnet 3 and the top of the vertical electromagnet 20 both generate N magnetic poles, the N magnetic pole at the top of the closed electromagnet 3 is attracted with the S magnetic pole of the permanent magnet stop block 4 embedded in the bottle cap 1, the suction force clamps the groove longitudinal wall 17 of the circuit box 2 between the permanent magnet stop block 4 and the closed electromagnet 3, the plug head 16 in threaded connection with the circuit box 2 is fixed from the suction force, and the plug head blocks the mouth of the inner container 15 for heat preservation; on the other hand, the CPU delays for 3s for closing the bottle cap 1 before measuring the water level, the plug 16 plugs the bottle mouth for heat preservation, and then the CPU instructs O1Triggering starting pulse sent by the pin, the ultrasonic wave sent by the ultrasonic sensor 18 reflects Echo for the first time when passing through the bottom of the plug head 16, the ultrasonic wave reflects Echo for the second time when reaching the water surface in the bottle, and the ultrasonic sensor serially sends a time difference signal of the received Echo for the second time to the I of the CPU through an Echo pin of the ultrasonic sensor1And the pin and the CPU calculate the water level according to the time difference and by combining the preset height of the inner container and the wave speed, and convert the water level into the voltage output of the pin DA of the digital-to-analog conversion output end of the pin.
The DA pin sends a voltage to the signal input Sig pin of the optical tape driver, which drives each LED to emit light. If the air column is short, the water level is high, the lighted light band is long, and when the LED light band is fully lighted, the bottle is indicated to be full of water.
When a user pours water, the bottle cap 1 is lifted and rotates to a vertical position around the bottle cap rotating shaft 10, and the permanent magnet moving block in the bottle cap 1 at the tail end of the hinge8N magnetic pole, with the hinge below arrangement of reinforcement on imbed the conductive rubber piece 12 contact on the quiet piece 11 of permanent magnetism and inhale tightly with the S magnetic pole of the quiet piece 11 of permanent magnetism, this suction makes the bottle lid vertical all the time, can not empty the closure because of the dead weight, conductive rubber piece 12 plays the shock-resistant effect of buffering, magnetism is inhaled moving contact 9 and is closed by the conductive rubber piece short circuit, CPU' S I2The pin is connected with zero potential.
Thus CPU instruction O2The pin outputs low level to negatively saturate the operational amplifier, which outputs an inverted current i2，i2＝-i1The top of the closed electromagnet 3 and the top of the vertical electromagnet 20 are made to present an S magnetic pole, the S magnetic pole at the top of the closed electromagnet 3 is made to repel with the S magnetic pole of the permanent magnet stopper 4, and the S magnetic pole at the top of the vertical electromagnet 20 is made to attract with the N magnetic pole of the permanent magnet stopper 4, so that the torque generated by the attraction force makes the circuit box groove longitudinal wall 17 rotate around the center line of the front rotating shaft 22 and the rear rotating shaft 7 away from the permanent magnet stopper 4, and the groove transverse wall 24 rotates to approach the N magnetic pole of the permanent magnet stopper 4, so that the N magnetic pole of the permanent magnet stopper 4 is attracted with the S magnetic pole at the top of the vertical electromagnet 20, when the groove transverse wall 24 rotates to the vertical position, that is, 90 degrees, the groove transverse wall is attached to the permanent magnet stopper 4, the circuit box groove transverse wall 24 is firmly clamped between the permanent magnet stopper 4 and the vertical electromagnet 20 by the attraction force, and the circuit box 2 and the.
In the process of filling water into the bottle, the water column in the bottle is continuously increased, the tone emitted by the water column vibration is lower and lower, the air column in the bottle is shorter and higher, and the tone emitted by the air column vibration is higher and higher, so the AD pin of the analog-digital conversion end of the CPU collects the Signal of the Signal pin at the output end of the directional sound sensor 23 in real time, after the CPU extracts the tone Signal representing the water level from the Signal, the Signal is compared with a plurality of preset tone water level corresponding curves in a ROM in real time to determine the current water level, and the water level is converted into the DA pin voltage of the CPU to be output.
Similarly, the voltage of the DA pin is output to an input end Sig pin of the light band driver, when the water level is high, the light band is long, and when the D of the LED light band is1～D4Sequentially lighting one by one, namely the water level in the bottle changes from low to high, and when the bottle is fully lighted, the bottle is prompted to stop filling water。
After the water is filled, the bottle cap 1 is pressed and closed, the permanent magnet movable block 8 is separated from the permanent magnet static block 11, and the I of the CPU2At the moment when the pin reaches a high level, on one hand, the circuit box 2 is wholly inverted for 90 degrees and fixed instantly, on the other hand, the CPU delays for 3s to wait for the bottle cap to be closed, and then the ultrasonic sensor 18 is used for measuring the water level and the LED light band 5 is used for displaying.
Although the rotation of the circuit box is instantaneously completed by the electromagnetic action, the user may have a slow motion, so that a delay of 3s is set.

Claims (9)

1. The utility model provides a thermos that has water level to instruct, includes inner bag, bottle shell, bottle lid, chock plug, circuit box, its characterized in that: the circuit box is arranged in the bottle cap, the rear end of the bottle cap is connected with the bottle shell at the bottle opening through a hinge, permanent magnet static blocks with magnetic poles distributed up and down are longitudinally embedded in a bottle shell reinforcing bar below the hinge, permanent magnet moving blocks with magnetic poles distributed up and down are embedded in the bottle cap at the tail end of the hinge, and a pair of magnetic attraction moving contacts are exposed on the bottom surface of the magnetic poles; the circuit box comprises a control circuit, an ultrasonic sensor, a sound sensor, an LED light band, a vertical electromagnet and a closed electromagnet, wherein the control circuit consists of a CPU (central processing unit), an operational amplifier, a light band driver and a resistor, a convex hole external thread at the center of the bottom surface of the circuit box is in threaded connection with a concave hole internal thread at the center of a plug head, the plug head is installed and fixed at the bottom of the circuit box, the ultrasonic sensor is arranged in the convex hole and is tightly attached to the bottom surface of the concave hole of the plug head, and the water level in the bottle right below the plug head can be detected by separating the bottom surface; when the bottle cap is closed, the CPU receives a data signal sent by the ultrasonic sensor, calculates the water level by combining the preset height of the inner container and the wave speed, converts the water level into the voltage output of a pin DA of the digital-to-analog conversion output end of the water level, and drives the LED light band to emit light to indicate the water level; when water is filled, the bottle cap is erected, the permanent magnet movable block behind the bottle cap and the permanent magnet fixed block on the reinforcing bar of the bottle shell are tightly attracted by magnetic force, so that the bottle cap is not toppled, meanwhile, the CPU in the circuit box drives the vertical electromagnet to tightly attract the permanent magnet stop block embedded in the bottle cap through the wall of the circuit box, the circuit box is clamped and fixed by the attraction, the water filling sound detected by the directional sound sensor arranged in the circuit box through hole facing the bottle opening is extracted by the CPU, and the tone signal representing the water level is extracted by the CPU to drive the LED light band to indicate the height of the water level.
2. A thermos with water level indication according to claim 1, characterized in that: the front side surface and the rear side surface of the circuit box are inserted into a front coaxial shaft hole and a rear coaxial shaft hole of the inner side of the bottle cap through a front rotating shaft and a rear rotating shaft respectively, the central lines of the front rotating shaft and the rear rotating shaft are superposed, so that the circuit box is installed on the inner side of the bottle cap in a hanging mode, the rear rotating shaft is a hollow shaft communicated with a control circuit, and the control circuit is connected with a pair of magnetic attraction moving contacts at the bottom of a permanent magnet moving block outside the circuit box through two wires laid in the hollow shaft.
3. A thermos with water level indication according to claim 2, characterized in that: the bottle cap, the bottle shell, the circuit box and the front rotating shaft and the rear rotating shaft thereof are made of transparent engineering plastics, so that light emitted by the LED light band can penetrate through the transparent engineering plastics to be observed by a user; the surfaces of the front rotating shaft and the rear rotating shaft of the circuit box and the shaft holes at the front side and the rear side of the bottle cap are mirror smooth; the outer surface of the plug head which is contacted with the mouth of the liner is a flexible plastic cambered surface.
4. A thermos with water level indication according to claim 1, characterized in that: the bottle shell below the hinge is provided with a longitudinal reinforcing bar, the reinforcing bar is longitudinally embedded with cuboid permanent magnet static blocks of which the magnetic poles are distributed up and down and the side surfaces are stuck with conductive rubber sheets, and the conductive rubber sheets are parallel and level to the outer surface of the reinforcing bar and are exposed.
5. A thermos with water level indication according to claim 1, characterized in that: one end of the pair of magnetic moving contacts is connected with zero potential, and the other end is connected with I of a CPU in the control circuit2The pin, when the bottle lid is opened to vertical position, the permanent magnetism movable block along with the bottle lid rotation with the static piece of permanent magnetism is close to by opposite magnetic pole looks attraction, a pair magnetism of permanent magnetism movable block is inhaled the movable contact and is oppressed by this suction on the conductive rubber piece, should inhaleThe force not only presses and fixes the bottle cap at the vertical position, but also causes the pair of magnetic attraction contacts to be short-circuited by the conductive rubber sheet, and then the I2The pin inputs low level, otherwise I2The pin is set high by the circuit hardware.
6. A thermos with water level indication according to claim 1, characterized in that: when the bottle cap is closed, the bottom surface of the circuit box is horizontal, the shape of the circuit box above the plug head, which is cut by a plane vertical to the axes of the front rotating shaft and the rear rotating shaft, is stepped, one side in the middle of the circuit box is provided with a groove longitudinal wall and a transverse wall vertical to the groove longitudinal wall, the S magnetic pole of a cuboid permanent magnet stop block embedded in the inner side of the bottle cap is tightly attached to the outer side of the groove longitudinal wall, the top end of the inner side of the groove longitudinal wall is provided with a closed electromagnet and an LED light band, the top end of the inner side of the groove transverse wall is provided with a vertical electromagnet2The pins are high-level, the distance between the axes and the stepped top surface, and the distance between the axes of the front rotating shaft and the rear rotating shaft and the plane of the outer surface of the transverse wall of the stepped groove are sequentially equal to the projection distance between the axes and the top end of the transverse wall of the groove in the horizontal projection of the circuit box, and the projection distance between the axes and the outer surface of the N magnetic pole of the permanent magnet stop block is equal; when CPU instruction O2The pin outputs high level to make the operational amplifier output the driving current i1The tops of the closed electromagnet and the vertical electromagnet are both N magnetic poles, the N magnetic pole at the top of the closed electromagnet is attracted with the S magnetic pole of the permanent magnet stop block, and the longitudinal wall of the groove of the circuit box is vertically clamped between the permanent magnet stop block and the closed electromagnet by the attraction, so that the circuit box, the plug head, the front rotating shaft and the rear rotating shaft are completely fixed; when the bottle cap is vertical, the I of the CPU2Pin input low level, CPU instruction O2Low level of pin output to make operational amplifier output inverted current i2I.e. i2＝-i1The top of the closed electromagnet and the top of the vertical electromagnet are S magnetic poles, the S magnetic pole at the top of the closed electromagnet and the S magnetic pole of the permanent magnet stop block repel each other, and the torque caused by the repulsion force enables the circuit box to drive the plug head to rotate around the front rotating shaft and the rear rotating shaft to do the rotating motion deviating from the permanent magnet stop block, and meanwhile, the transverse wall of the groove is provided with a grooveThe N magnetic pole of the permanent magnet stop block is close to the N magnetic pole of the permanent magnet stop block due to rotation, the N magnetic pole of the permanent magnet stop block is attracted with the S magnetic pole at the top of the vertical electromagnet, when the transverse wall of the groove rotates to a vertical position, namely rotates by 90 degrees, the transverse wall of the groove is tightly attached to the permanent magnet stop block, the transverse wall of the groove of the circuit box is firmly clamped between the permanent magnet stop block and the vertical electromagnet by the attraction, and the circuit box, the plug head, the front rotating shaft and the rear rotating shaft are completely fixed again; if the I of the CPU2The pin is input again at high level, then the CPU instruction O2The pin outputs a high level again, so that the circuit tape cassette, the plug head and the front and rear rotating shafts are fixed again after being reversed by 90 degrees.
7. A thermos with water level indication according to claim 1, characterized in that: o of the CPU1Pin and I1The pins are respectively connected with a trigger end Trig pin and a response end Echo pin of the ultrasonic sensor; i of CPU2After the pin reaches high level, CPU delays for 3s to close the bottle cap, and then CPU instructs O1Triggering starting pulse sent by the pin, reflecting Echo for the first time when ultrasonic wave sent by the ultrasonic sensor passes through the bottom of the plug head, reflecting Echo for the second time when the ultrasonic wave reaches the water surface in the bottle, and serially sending a time difference signal of the received Echo for the second time to the I of the CPU through an Echo pin of the ultrasonic sensor1And the pin and the CPU calculate the water level according to the time difference and by combining the preset height of the inner container and the wave speed, and convert the water level into the voltage output of the pin DA of the digital-to-analog conversion output end of the pin.
8. A thermos with water level indication according to claim 1, characterized in that: when the bottom surface of the circuit box is horizontal, a through hole is formed in the center of the other vertical wall opposite to the vertical wall of the groove, and an output end Signal pin of a directional sound sensor installed in the through hole is connected with an analog-digital conversion end AD pin of the CPU; when the circuit box rotates by 90 degrees, the sound sensor transmits collected sound right in front outside the hole to the AD pin of the CPU for receiving, the CPU extracts tone signals representing the water level from the sound sensor, compares the signals with a plurality of preset tone water level corresponding curves in the ROM in real time to determine the current water level, and converts the water level into the DA pin voltage of the CPU for outputting.
9. A thermos with water level indication according to claim 8, characterized in that: the DA pin of the CPU is connected to a signal end SIG pin of the light band driver, and the light band driver sequentially lights the LEDs in the light band according to the level of the SIG pin.
CN202011153774.XA 2020-10-26 2020-10-26 Thermos bottle with water level indicator Pending CN112294141A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62218819A (en) * 1986-03-20 1987-09-26 Toshiba Corp Water level detector for electric thermos bottle
GB8921242D0 (en) * 1989-09-20 1989-11-08 Lay Shin H Electric hot water bottle
US20070261487A1 (en) * 2006-04-27 2007-11-15 Sintes Hugh C Level sensor
CN202875093U (en) * 2012-08-14 2013-04-17 沈阳师范大学 Intelligent thermos bottle
CN203369812U (en) * 2013-04-16 2014-01-01 中国计量学院 Thermos cover
CN104197525A (en) * 2014-09-05 2014-12-10 河海大学常州校区 Device and method for electric water heater capable of automatically preventing water from overflowing during water receiving through vacuum bottle
CN107436170A (en) * 2016-05-31 2017-12-05 太平洋市场国际有限责任公司 For the method and component using the liquid level in acoustic resonance measuring apparatus measurement container for drink
CN208973590U (en) * 2018-07-10 2019-06-14 安徽中医药大学 Intelligent domestic cooking machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62218819A (en) * 1986-03-20 1987-09-26 Toshiba Corp Water level detector for electric thermos bottle
GB8921242D0 (en) * 1989-09-20 1989-11-08 Lay Shin H Electric hot water bottle
US20070261487A1 (en) * 2006-04-27 2007-11-15 Sintes Hugh C Level sensor
CN202875093U (en) * 2012-08-14 2013-04-17 沈阳师范大学 Intelligent thermos bottle
CN203369812U (en) * 2013-04-16 2014-01-01 中国计量学院 Thermos cover
CN104197525A (en) * 2014-09-05 2014-12-10 河海大学常州校区 Device and method for electric water heater capable of automatically preventing water from overflowing during water receiving through vacuum bottle
CN107436170A (en) * 2016-05-31 2017-12-05 太平洋市场国际有限责任公司 For the method and component using the liquid level in acoustic resonance measuring apparatus measurement container for drink
CN208973590U (en) * 2018-07-10 2019-06-14 安徽中医药大学 Intelligent domestic cooking machine

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Application publication date: 20210202