CN204346543U - Non-contact type liquid level detecting device - Google Patents
Non-contact type liquid level detecting device Download PDFInfo
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- CN204346543U CN204346543U CN201520043130.3U CN201520043130U CN204346543U CN 204346543 U CN204346543 U CN 204346543U CN 201520043130 U CN201520043130 U CN 201520043130U CN 204346543 U CN204346543 U CN 204346543U
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Abstract
The utility model discloses a kind of Non-contact type liquid level detecting device, it comprises: check-out console, be arranged on check-out console and at least one sensing unit spaced and to be arranged on check-out console and to export with at least one sensing unit the control detecting unit be connected, CapSense is wherein utilized to respond to self-capacitance or mutual capacitance detection technique, be combined into detection module by control detecting unit and sensing unit, the change of Detection capacitance value obtains liquid level information.The utility model accuracy of detection is high, and cost is low, it is convenient to install, cleaning container is convenient, and can meet the demand of the overwhelming majority to level sensing, being particluarly suitable for humidifier, clarifier, water purifier, coffee machine etc. needs the household electrical appliance of clean container use.
Description
Technical field
The utility model relates to a kind of Non-contact type liquid level detecting device.
Background technology
As everyone knows, level sensing mode is divided into contact level sensing and contact-free level to detect, as the term suggests contact level sensing mode, be sensor to contact with each other with detected liquid, as shown in Figure 1, this mode implements relatively simple, directly be inserted in liquid by conducting probe or conductive foil 6, utilize the electric conductivity of liquid, rise along with liquid level and rise, electrode signal also produces corresponding change, to electrifying electrodes in liquid, electrolytics reaction can be there is, oxygen can be produced during brine electrolysis, long-time easily breed bacteria, simultaneously, conductive electrode also can be corroded, a large amount of metallic ion is produced in liquid, although accurately measurement liquid level power can be improved by increasing electrode, but want anticreeper during structure installment, also be easily struck by lightning, contact level sensing also inapplicable various soda acid in addition, inflammable, the level sensing of high-risk liquid, therefore people start the research that turns to contact-free level to detect.
It is exactly that sensor does not directly contact with detected liquid is mutually isolated that contact-free level detects, traditional contact-free level detection mode mainly contains ultrasound examination mode, laser detection mode, hall device or tongue tube and coordinates float (inside having magnet) detection mode etc., wherein ultrasound examination mode and laser detection mode are all utilize principle of reflection to carry out level sensing, cost and installation requirement higher and there is certain blind area; And hall device or tongue tube coordinate float (inside having magnet) detection mode to utilize liquid buoyancy principle to carry out level sensing, but it requires higher to structure installment, and there is the hidden danger that float blocks.As shown in Figure 2, it is the structure that a hall device or tongue tube coordinate float detection, pick-up unit 1 is cylindricality and is inserted in liquid, float 2 has magnet 3 along with liquid level change in change also along pick-up unit 1, simultaneously, pick-up unit 1 is provided with multiple sensor 4 in the height direction, when the 3rd or the 5th sensor signal disappears, four-sensor detects the magnet 3 of float 2, illustrate that water level is in the 4th lattice, want measure water position, need to increase multiple sensor, mounting structure difficulty also increases greatly, and also need to prevent liquid from entering pick-up unit inside, sensor 4 have employed the higher tongue tube sensor of cost or Hall element simultaneously, also cause its cost higher.Pick-up unit inside is entered for stopping liquid, as shown in Figure 3, it is the structure that another hall device or tongue tube coordinate float detection, its multiple sensor 4 is set directly at outside container, the float 2 with magnet 3 is then set in container, and the float frame 5 guiding float 2 to move up and down, its structure is comparatively simple, but purify air at some, water purification, when the equipment such as humidification needing cleaned at regular intervals container, easily do not wash clean clearly, there is dead angle, not easily remove dirt, and want measure water position, also need to increase multiple sensor, greatly increase cost.
Utility model content
The utility model object is: provide a kind of Non-contact type liquid level detecting device, to simplify structure, realizes accurately measuring liquid level, even if also can permanently effectively use in the presence of a harsh environment, is conducive to the cleaning of user to internal tank, can reduces costs again.
First technical scheme of the present utility model is: a kind of Non-contact type liquid level detecting device, it is arranged on the outside of container, it comprises: check-out console, be arranged on check-out console and at least one sensing unit spaced and to be arranged on check-out console and to export with at least one sensing unit the control detecting unit be connected, wherein control detecting unit and sensing unit are combined into detection module, and the change of Detection capacitance value obtains liquid level information.
On the basis of the first technical scheme, comprise following attached technical scheme further:
For covering copper, and there is gap between adjacent two sensing units in described sensing unit.
Between described check-out console and container, spacing is less than or equal to 10mm, described sensing unit cover that copper face is long-pending is more than or equal to 10 square millimeters.
When it is liquid level discontinuous pick-up unit, wherein said sensing unit only has one when liquid level sustained height;
When it is liquid level continuous detection apparatus, described sensing unit has two at least when liquid level sustained height, and the area of neighboring sensor unit has staggered in vertical direction.
When described sensing unit is at least one, and utilize at least one covering between copper and power cathode to there is an intrinsic stray capacitance, and detect liquid level by capacitance variations between this sensing unit and power cathode; Or
When described sensing unit is at least two, at least two pieces of adjacent covering are utilized between copper, to there is an intrinsic stray capacitance, wherein a sensing unit transmits, another sensing unit then Received signal strength, and detects liquid level by capacitance variations between sensing unit.
Second technical scheme of the present utility model is: a kind of Non-contact type liquid level detecting device, it is arranged on outside container, it comprises: vertical direction extends with the check-out console measuring liquid level, be arranged at least one sensing unit on check-out console, to be arranged on check-out console and to export with at least one sensing unit the control detecting unit be connected, the host computer be connected with the output controlling detecting unit, export with host computer and be connected and show the display unit of level condition, the power supply of electric power is provided to controlling detecting unit, and to export with host computer and be connected and the water level controller be connected with power supply, wherein the change of sensing unit Detection capacitance value obtains liquid level information.
On the basis of the second technical scheme, comprise following attached technical scheme further:
Described sensing unit is for covering copper, and there is gap between adjacent two sensing units, described check-out console and chamber wall spacing are less than or equal to 10mm, described sensing unit cover that copper face is long-pending is more than or equal to 10 square millimeters, each interval area is less than each area covering copper, and the height in each gap is also less than each height covering copper, to realize accurate measurement.
When described sensing unit is at least one, and utilizes and at least onely cover the self-capacitance existed between copper and power cathode, and detect liquid level by capacitance variations between this sensing unit and power cathode; Or
When described sensing unit is at least two, utilize at least two pieces adjacent to cover the mutual capacitance existed between copper, wherein a sensing unit transmits, another sensing unit then Received signal strength, and detects liquid level by capacitance variations between sensing unit.
Have household electrical appliance for above-mentioned Non-contact type liquid level detecting device, described household electrical appliance are humidifier, air purifier, water purifier, coffee machine.
The utility model advantage is:
1) permanently effectively can use, water quality higher in temperature is poor, extend serviceable life;
2) may be used for the level sensing of various soda acid, inflammable, high-risk liquid;
3) and fluid insulation, be not afraid of thunderbolt, faint electrolytic reaction can not occur yet;
4) simplify structure, realize accurately measuring liquid level, be conducive to the cleaning of user to internal tank, can reduce costs again.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further described:
Fig. 1 is the structural representation of contact level sensing in prior art;
Fig. 2 is the structural representation that in prior art, a contact-free level detects;
Fig. 3 is the structural representation that in prior art, another contact-free level detects;
Fig. 4 is the structural representation of the first embodiment in the utility model;
Fig. 5 is the structural representation of discontinuous level scale check-out console in the utility model;
Fig. 6 is the structural representation of continuous level scale check-out console in the utility model;
Fig. 7 is the utility model circuit theory diagrams;
Fig. 8 is the distribution schematic diagram of self-capacitance equivalent capacity in the utility model;
Fig. 9 is the distribution schematic diagram of mutual capacitance type equivalent capacity in the utility model.
Figure 10 is another structural representation in the utility model;
Wherein: 1, pick-up unit; 2, float; 3, magnet; 4, sensor; 5, float frame; 6, conducting probe; 10, chamber wall; 12, cavity volume; 20, check-out console; 21,210, sensing unit; 22, detecting unit is controlled; 23,230, spacing; 24, host computer; 25, display unit; 26, power supply; 27, water level controller.
Embodiment
Embodiment: as shown in figs. 4-7, the utility model provides a kind of first embodiment of Non-contact type liquid level detecting device, its be arranged on there is cavity volume 12 and chamber wall 10 container outside, it comprises: be arranged on the check-out console 20 outside chamber wall 10, to be arranged on check-out console 20 and multiple sensing units 21 of perpendicular separation arrangement, 210, gap 23 between neighboring sensor unit 21, 230, to be arranged on check-out console 20 and to export with multiple sensing unit 21 the control detecting unit 22 be connected, the host computer 24 be connected with the output controlling detecting unit 22, export with host computer 24 and be connected and show the display unit 25 of level condition, the power supply 26 of electric power is provided to controlling detecting unit 22, and to export with host computer 24 and be connected and the water level controller 27 be connected with power supply 26.Wherein chamber wall 10 defines cavity volume 12, and cavity volume 12 accommodates liquid, and the change of sensing unit 21,210 Detection capacitance value obtains liquid level information.Check-out console 20 preferably fits tightly the outside at chamber wall 10, and gap of fitting when avoiding water temperature to change occurs that some impact accuracy of detection as condensation.
Control detecting unit 22 for carrying Detection capacitance sensing microcontroller, touch key-press detection module is integrated in 8 or 16 single-chip microcomputers of microprocessor internal, concrete effect is application sensing unit feedback, chip internal calculates liquid level, utilize IIC communication between microprocessor, by current level information transmission to host computer 24.
Its effect of water level controller 27 just refers to according to current level being detected, and carries out some controls, such as, controls suction pump automatic watering when water purifier or coffee machine lack of water, closes suction pump when water is full; Humidifier, lack of water is shut down and is pointed out user to carry out operations such as adding water.
Sensing unit 21,210 is for covering copper, and shape is rectangular, trapezoidal, rhombus, ellipse, serrate etc., and there is gap 23,230 between adjacent two sensing units 21,210, its intermediate gap 23,230 is greater than 0.2 millimeter lower than 10 millimeters, to ensure that signal does not disturb.
As shown in Figure 5, when sensing unit 21 is rectangular, for discontinuous scale water level detecting, one is only had when liquid level sustained height, for ensureing accuracy of detection, sensing unit 21 will be quadratured and is more than or equal to 10 square millimeters, and transverse width can not be too little, when water covers sensing unit 21, sensing unit 21 measures now electric capacity and can change (namely container middle water level height is in the scope of this sensing unit 21 area distributions) accordingly, by the size of sensing unit 21 capacitance change, determine the height of liquid level.
As shown in Figure 6, sensing unit 210 distributional class is similar to even zigzag, detect for continuous level scale, ensure always have 1 to 2 sensing unit 210 crossing with liquid level parallel surface at same height of water level, the area of neighboring sensor unit 210 has staggered in vertical direction, this just fully guarantees when liquid level changes, and always has sensing unit 210 can monitor it and changes, can Measurement accuracy liquid level in real time.
Preferably, between check-out console 20 and chamber wall 10, spacing is less than or equal to 10mm.
Preferably, above-mentioned Non-contact type liquid level detecting device directly can be applied on the household electrical appliance such as such as humidifier, air purifier, water purifier, coffee machine.
As shown in Figure 10, the check-out console 20 in above-described embodiment also directly can not be fitted with chamber wall 10, and it fits tightly on body 30, and this body 30 can not be too large with chamber wall 10 spacing simultaneously, is generally no more than 10mm, can realizes equally.
The utility model also provides a kind of second embodiment of contact-free level detection method, and it comprises:
First provide and be positioned at check-out console 20, at least one sensing unit 21 be arranged on check-out console 20 outside container, be arranged on check-out console 20 and export the control module 22 be connected and the host computer 24 be connected with the output of control module 22 with at least one sensing unit 21, wherein sensing unit 21 is for covering copper;
Then each sensing unit 21 corresponding capacitance value during container no liquid is detected, and capacitance value data now stored in control module 22, as reference reference capacitance value; As shown in Figure 8, it is self-capacitance equivalent capacity distribution schematic diagram, there is an intrinsic stray capacitance Cp (also known as self-capacitance) in single or multiple sensing unit 21 opposed power negative pole, similarly, Fig. 9 is mutual capacitance type equivalent capacity distribution schematic diagram, the stray capacitance Cp (also known as mutual capacitance) that between every two sensing units 21, existence one is intrinsic.
Then liquid is put into container;
Last inspection instrument has each sensing unit 21 corresponding capacitance value during liquid, and compare with the reference data capacitance of each sensing unit 21 during no liquid before, in self-capacitance situation as shown in Figure 8, when the liquid height in cavity volume 12 reaches external sense unit 21 height, electric capacity can be caused to become Cp ＇ (i.e. Cp ＇=Cp+Cx) by Cp, by judging that the size of electric capacity Cx just can judge each sensing unit 21 location status; And in mutual capacitance type situation as shown in Figure 9, when the liquid height in cavity volume 12 reaches external sense unit 21 height, electric capacity can be caused to become Cp ＇ (i.e. Cp ＇=Cp+Cx) by Cp, transmitted by a sensing unit 21, another sensing unit 21 then Received signal strength, control detecting unit 22 and carry out electric capacity conversion, use and judge that the size of electric capacity Cx just can judge each sensing unit 21 location status.Thus when control module 22 detects each sensing unit 21 capacitance change, control module 22 internal arithmetic, calculate current level, host computer 24 is exported to by control module 22, then host computer 24 is allowed to control accordingly, even if water level controller 27 carry out water lev el control and and liquid level display, obtain current level showing thus.
The utility model detects liquid level capacitance variation and detects liquid level, accuracy of detection is high, cost is low, it is convenient to install, cleaning container is convenient, can meet the demand of the overwhelming majority to level sensing, being particluarly suitable for humidifier, clarifier, water purifier, coffee machine etc. needs the household electrical appliance of clean container use.
Certain above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalent transformations of doing according to the Spirit Essence of the utility model main technical schemes or modification, all should be encompassed within protection domain of the present utility model.
Claims (9)
1. a Non-contact type liquid level detecting device, it is arranged on the outside of container, it is characterized in that it comprises: check-out console (20), be arranged at least one sensing unit (21,210) on check-out console (20) and be arranged on check-out console (20) upper and export with sensing unit (21,210) the control detecting unit (22) be connected, wherein control detecting unit (22) and be combined into detection module with sensing unit (21,210), common Detection capacitance value change obtains liquid level information.
2. a kind of Non-contact type liquid level detecting device as claimed in claim 1, is characterized in that: described sensing unit (21,210) for covering copper, and exists gap (23,230) between adjacent two sensing units (21,210).
3. a kind of Non-contact type liquid level detecting device as claimed in claim 2, it is characterized in that: between described check-out console (20) and container, spacing is less than or equal to 10mm, described sensing unit (21,210) cover that copper face is long-pending is more than or equal to 10 square millimeters.
4. a kind of Non-contact type liquid level detecting device as claimed in claim 2 or claim 3, is characterized in that:
1), when it is liquid level discontinuous pick-up unit, wherein said sensing unit (21,210) only has one when liquid level sustained height; Or
2) when it is liquid level continuous detection apparatus, described sensing unit (21,210) has two at least when liquid level sustained height, and the area of neighboring sensor unit (21,210) has staggered in vertical direction.
5. a kind of Non-contact type liquid level detecting device as claimed in claim 2 or claim 3, is characterized in that:
1) when described sensing unit (21,210) is at least one, and utilize at least one covering between copper and power cathode to there is an intrinsic stray capacitance, and detect liquid level by capacitance variations between this sensing unit (21,210) and power cathode; Or
2) when described sensing unit (21,210) is at least two, at least two pieces of adjacent covering are utilized between copper, to there is an intrinsic stray capacitance, wherein a sensing unit (21,210) transmits, another sensing unit (21,210) then Received signal strength, and detect liquid level by capacitance variations between sensing unit.
6. a Non-contact type liquid level detecting device, it is arranged on outside container, it is characterized in that it comprises: vertical direction extends with the check-out console (20) measuring liquid level, be arranged at least one sensing unit (21 on check-out console (20), 210), be arranged on check-out console (20) go up and export with multiple sensing unit (21) the control detecting unit (22) be connected, the host computer (24) be connected with the output controlling detecting unit (22), export with host computer (24) and be connected and show the display unit (25) of level condition, the power supply (26) of electric power is provided to controlling detecting unit (22), and to export with host computer (24) and be connected and the water level controller (27) be connected with power supply (26), wherein sensing unit (21, 210) change of Detection capacitance value obtains liquid level information.
7. a kind of Non-contact type liquid level detecting device as claimed in claim 6, it is characterized in that: described sensing unit (21,210) is for covering copper, and there is gap (23,230) between adjacent two sensing units (21,210), described check-out console (20) and chamber wall (10) spacing are less than or equal to 10mm, described sensing unit (21,210) cover that copper face is long-pending is more than or equal to 10 square millimeters.
8. a kind of Non-contact type liquid level detecting device as claimed in claims 6 or 7, is characterized in that:
1), when described sensing unit (21,210) is at least one, utilizes and at least onely cover the self-capacitance existed between copper and power cathode, and detect liquid level by capacitance variations between this sensing unit (21,210) and power cathode; Or
2) when described sensing unit (21,210) is at least two, two pieces are utilized adjacent to cover the mutual capacitance existed between copper, wherein a sensing unit (21,210) transmits, another sensing unit (21,210) then Received signal strength, and detect liquid level by capacitance variations between sensing unit.
9. there are household electrical appliance for Non-contact type liquid level detecting device as described in claim 1 or 2 or 6 or 7, it is characterized in that: described household electrical appliance are humidifier, air purifier, water purifier, coffee machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520043130.3U CN204346543U (en) | 2015-01-22 | 2015-01-22 | Non-contact type liquid level detecting device |
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| CN201520043130.3U CN204346543U (en) | 2015-01-22 | 2015-01-22 | Non-contact type liquid level detecting device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535135A (en) * | 2015-01-22 | 2015-04-22 | 上海飞科电器股份有限公司 | Non-contact liquid level detection device and non-contact liquid level detection method |
| CN104997409A (en) * | 2015-08-21 | 2015-10-28 | 苏州工业园区咖乐美电器有限公司 | Coffee machine |
| CN105963145A (en) * | 2016-07-01 | 2016-09-28 | 彩鹤科技（深圳）有限公司 | Nano mask machine, method for making mask by using same and prepared mask |
| CN106198102A (en) * | 2016-06-30 | 2016-12-07 | 四川行之知识产权运营服务有限公司 | A kind of sampler of real-time detection sampling amount |
| CN107126088A (en) * | 2017-06-12 | 2017-09-05 | 浙江绍兴苏泊尔生活电器有限公司 | Heating container |
| CN107782411A (en) * | 2016-08-25 | 2018-03-09 | 联阳半导体股份有限公司 | Liquid level detector and liquid level detection method |
| US11169015B2 (en) | 2020-01-06 | 2021-11-09 | Ite Tech. Inc. | Liquid level sensor and method for sensing liquid level |
| US11300536B1 (en) | 2020-12-18 | 2022-04-12 | Cypress Semiconductor Corporation | Non-contact liquid sensing technologies |
-
2015
- 2015-01-22 CN CN201520043130.3U patent/CN204346543U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535135A (en) * | 2015-01-22 | 2015-04-22 | 上海飞科电器股份有限公司 | Non-contact liquid level detection device and non-contact liquid level detection method |
| CN104535135B (en) * | 2015-01-22 | 2018-11-09 | 上海飞科电器股份有限公司 | Non-contact type liquid level detecting device and method |
| CN104997409A (en) * | 2015-08-21 | 2015-10-28 | 苏州工业园区咖乐美电器有限公司 | Coffee machine |
| CN106198102A (en) * | 2016-06-30 | 2016-12-07 | 四川行之知识产权运营服务有限公司 | A kind of sampler of real-time detection sampling amount |
| CN105963145A (en) * | 2016-07-01 | 2016-09-28 | 彩鹤科技（深圳）有限公司 | Nano mask machine, method for making mask by using same and prepared mask |
| CN107782411A (en) * | 2016-08-25 | 2018-03-09 | 联阳半导体股份有限公司 | Liquid level detector and liquid level detection method |
| CN107126088A (en) * | 2017-06-12 | 2017-09-05 | 浙江绍兴苏泊尔生活电器有限公司 | Heating container |
| CN107126088B (en) * | 2017-06-12 | 2022-07-08 | 浙江绍兴苏泊尔生活电器有限公司 | Heating container |
| US11169015B2 (en) | 2020-01-06 | 2021-11-09 | Ite Tech. Inc. | Liquid level sensor and method for sensing liquid level |
| US11300536B1 (en) | 2020-12-18 | 2022-04-12 | Cypress Semiconductor Corporation | Non-contact liquid sensing technologies |
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Address after: 201603 Shanghai city Songjiang District Guangfulin Road No. 555 Patentee after: SHANGHAI FLYCO ELECTRICAL APPLIANCE CO., LTD. Address before: 201603 Shanghai Songjiang District city streets of Zhongshan Xu Tang Lu 88-1 Patentee before: SHANGHAI FLYCO ELECTRICAL APPLIANCE CO., LTD. |
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