CN111521241B - Liquid level detection device and solar water heater - Google Patents
Liquid level detection device and solar water heater Download PDFInfo
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- CN111521241B CN111521241B CN201910105123.4A CN201910105123A CN111521241B CN 111521241 B CN111521241 B CN 111521241B CN 201910105123 A CN201910105123 A CN 201910105123A CN 111521241 B CN111521241 B CN 111521241B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
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- 230000007774 longterm Effects 0.000 description 2
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- 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
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
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- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a liquid level detection device and a solar water heater, which comprise a hollow pipe, wherein a closed cavity is arranged in the hollow pipe, a plurality of photoelectric detection elements are arranged in the hollow pipe along the length direction of the hollow pipe, each photoelectric detection element comprises a light emitting part, a light receiving part and a light reflecting part, the light emitting parts and the light receiving parts are positioned in the cavities, at least part of the light reflecting parts penetrate through the side wall of the hollow pipe and extend out of the hollow pipe, the light emitting parts emit light towards the light emitting parts, the light emitting parts are reflected back by the light reflecting parts and received by the light receiving parts, the light receiving parts generate corresponding electric signals according to the received light and send the electric signals to a processing module, and the processing module judges the current liquid level according to the electric signals sent by the light receiving parts. The liquid level detection device provided by the invention adopts the photoelectric liquid level detection element to detect the liquid level, and the packaging mode of the liquid level detection device realizes the separation of the circuit and the probe, so that the problem of failure or damage of a resistance type principle is avoided.
Description
Technical Field
The invention relates to the technical field of photoelectric detection, in particular to a water tank parameter detection method and a solar water heater.
Background
The existing liquid level control device of the solar water heater mainly adopts a resistance type, water in the solar water heater is in a boiling state for a long time, when certain pressure is accumulated, the temperature of water vapor reaches 140 ℃, the water is directly contacted with a circuit part when the resistance type device is used, and staged short circuit is easily caused due to the influence of high-temperature water vapor and scaling, so that a false alarm or an unreported result is formed, and the service life of the device is seriously shortened under the environment of long-term high-temperature water vapor corrosion.
In addition, the hardness of water quality in parts of domestic areas is high, water is stored in a water tank of the water heater all the year round, the scaling phenomenon of internal devices is obvious, particularly, the scaling is easy to form in a high-temperature state, and the precision and the service life of a traditional liquid level sensor are seriously influenced by the scaling phenomenon.
Disclosure of Invention
The invention provides a liquid level detection device, which aims to solve the technical problem that the existing liquid level detection device is easily damaged or has poor detection precision due to the influence of high-temperature water vapor and scaling.
In order to solve the technical problems, the invention adopts the following technical scheme:
the liquid level detection device comprises a hollow tube, wherein a closed cavity is formed in the hollow tube, a plurality of photoelectric detection elements are arranged in the hollow tube along the length direction of the hollow tube, each photoelectric detection element comprises a light emitting part, a light receiving part and a light reflecting part, the light emitting parts and the light receiving parts are located in the cavities, at least part of the light reflecting parts penetrate through the side wall of the hollow tube and extend out of the hollow tube, the light emitting parts face the light emitting parts to emit light, the light emitting parts are reflected back by the light reflecting parts and received by the light receiving parts, the light receiving parts generate corresponding electric signals according to the received light and send the electric signals to a processing module, and the processing module judges the current liquid level according to the electric signals sent by the light receiving parts.
Further, the method for judging the current liquid level by the processing module comprises the following steps: the processing module respectively judges the electric signals fed back by the photoelectric detection elements, if the voltage value of the electric signals is not less than B1, the photoelectric detection elements are judged to have no water at the corresponding height position in the water tank, if the voltage value of the electric signals is not more than A1, the photoelectric detection elements are judged to have water at the corresponding height position in the water tank, wherein A1 is less than B1.
Furthermore, in all the photoelectric detection elements which are judged to have water at the corresponding height position in the water tank at the same time, the height position corresponding to the photoelectric detection element with the highest position is the liquid level at the time.
Further, if the voltage value of the electrical signal is greater than a1 and less than B1, it is determined that the photodetecting element is not water at the corresponding height position in the water tank and the outer surface of the light emitting portion thereof is fouled.
Further, the processing module also comprises a step of judging the outer surface scaling thickness of each light reflection part and correcting the electric signal fed back by the photoelectric detection element according to the scaling thickness.
Furthermore, the outer surface scaling thickness of the light reflection part and the voltage value of the electric signal fed back by the photoelectric detection element are provided with a lookup table, and the scaling thickness corresponding to the current voltage value is found out according to the lookup table.
Further, when the scaling thickness is larger than a set threshold value, the method also comprises the step of alarming and prompting scaling.
Furthermore, the outer surface of the hollow tube is sequentially provided with a first heat insulation layer, a heat conduction layer and a second heat insulation layer from inside to outside, and the light reflection part protrudes out of the second heat insulation layer.
Further, the outer surface of the hollow pipe is also provided with a temperature sensor.
Furthermore, one end of the hollow tube is provided with an opening, and the opening part of the hollow tube is sealed by a sealing plug.
Compared with the prior art, the invention has the advantages and positive effects that: the liquid level detection device provided by the invention adopts the photoelectric liquid level detection element to detect the liquid level, the packaging mode of the liquid level detection device realizes the separation of a circuit and a probe, the problem of failure or damage of a resistance-type principle is avoided, the liquid level detection device is packaged by a heat insulation material, and meanwhile, the heat conduction material is used in the middle layer of the heat insulation material, so that the double protection of heat insulation and effective heat dissipation is realized, and the use is safe. Through detecting the voltage signal of photoelectric sensor feedback, can judge the scale deposit condition that corresponds, realize the function of intelligent monitoring scale deposit to remind the user to handle, with the rate of accuracy and the life that improve level sensor.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a liquid level detection apparatus according to the present invention;
FIG. 2 is an optical path diagram of the photo-electric detection element of the liquid level detection apparatus of FIG. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first embodiment, the present embodiment provides a liquid level detecting device, as shown in fig. 1, which includes a hollow tube 11, a closed cavity 12 is provided in the hollow tube 11, a plurality of photo detection elements 13 are provided in the hollow tube 11 along a length direction of the hollow tube, each photo detection element 13 includes a light emitting portion 131, a light receiving portion 132 and a light reflecting portion 133, the light emitting portion 131 and the light receiving portion 132 are located in the cavity 12, at least a portion of the light reflecting portion 133 penetrates through a sidewall of the hollow tube 12 to extend out of the hollow tube 12, the light emitting portion 131 emits light toward the light emitting portion 133, the light is reflected by the light reflecting portion 133 and received by the light receiving portion 132, the light receiving portion 132 generates a corresponding electrical signal according to the received light and sends the electrical signal to a processing module, and the processing module determines a current liquid level according to the electrical signal sent by each light receiving portion. The liquid level detecting device of this embodiment, using the photoelectric detection principle, only needs to extend the light reflection part to the outside of the hollow tube to contact with water, all the electric devices for light emission, reception and signal processing are sealed in the cavity of the hollow tube, the light transmission medium inside the light reflection part, i.e. the side close to the light emission part and the light reception part, is air, when the light emitted from the light emission part 131 is incident on the light reflection part via air, if the outside of the light reflection part is also air, i.e. the media on both sides of the light reflection part are the same, the light incident on the light reflection part is almost totally reflected and received by the light reception part, and outputs a high voltage electric signal to the processing module, if the outside of the light reflection part is water, i.e. the media on both sides of the light reflection part are different, the light incident on the light reflection part is refracted, and the water has a strong absorption capacity to the infrared band, most of optical signals are absorbed by water, so that only a small amount of light is reflected and received by the light receiving part, a low-voltage electric signal is output to the processing module, and by arranging the plurality of photoelectric detection elements 13, and the position of each photoelectric detection element 13 in the water tank along the vertical direction is known, so that the processing module judges the liquid level height according to the position, compared with the traditional contact type liquid level detection device, the problem that the traditional liquid level detection device is easy to lose efficacy or damage is solved, meanwhile, the measurement precision of the scheme is related to the arrangement density of the photoelectric detection elements 13, and the higher the density is, the higher the detection precision is, and the setting can be carried out according to the actual detection requirement.
The light reflecting portion 133 has a light transmitting property, and the material can be glass, acrylic, or the like, so that the reflecting effect is optimal when the included angle between the light emitted from the light emitting portion 131 and the reflecting surface of the light reflecting portion 133 is 45 °. Therefore, the light receiving section 132 should also be located on the reflection path of the reflected light to ensure that the reflected light is detected by the light receiving section 132.
As a preferred embodiment, the method for the processing module to determine the current liquid level is as follows: each photoelectric detection element 13 corresponds to a height value in the water tank, the processing module respectively judges the electric signals fed back by each photoelectric detection element, if the voltage value of the electric signals is not less than B1, the photoelectric detection elements are judged to have no water at the corresponding height position in the water tank, if the voltage value of the electric signals is not more than A1, the photoelectric detection elements are judged to have water at the corresponding height position in the water tank, wherein A1 is less than B1.
When the water level in the water tank is at a certain water level height, all the photoelectric detection elements with the positions lower than the water level output low levels, therefore, in all the photoelectric detection elements which are judged to have water at the corresponding height position in the water tank at the same time, the height position corresponding to the photoelectric detection element with the highest position is the liquid level at the time, the photoelectric detection element at the position is the first photoelectric detection element with the height not higher than the water level, and the height value of the photoelectric detection element is closest to the actual water level.
Because the hardness of water in many areas is high, water is stored in a water tank of a water heater all year round, the scaling phenomenon of internal devices is obvious, particularly, scaling is easy to form in a high-temperature state, scaling is easy to form on the outer surface of the light reflecting part 133 after long-term use, and the light reflection is directly influenced by the existence of the scaling, therefore, the liquid level detection device of the embodiment further comprises a step of judging scaling on the outer surface of the light reflecting part 133, under the non-water state, scaling and non-scaling have large influence on light reflection, the voltage value difference generated by the corresponding light receiving part 133 is large, whether scaling exists is easy to distinguish, the method preferably judges scaling under the non-water state, when no water exists and no scale, incident light is almost totally reflected to the light receiving part, when scale exists, infrared light is lost to a certain degree by the scale, compared with the non-water scale state, the refracted light flux is reduced, therefore, the light quantity received by the light receiving part is reduced, if the voltage value B2 of the electric signal is larger than A1 and smaller than B1, the photoelectric detection element is judged to be water-free at the corresponding height position in the water tank and the outer surface of the light emitting part is scaled.
The detection precision of the liquid level detection device is influenced by the scale, and the processing module also judges the scale thickness of the outer surface of each light reflection part and corrects the electric signal fed back by the photoelectric detection element according to the scale thickness.
The value of B2 has a functional relationship with the fouling thickness, and assuming that the fouling thickness of each photodetection element 13 is represented by Dj, the voltage value B2= pf (Dj) + q, (where p, q are constant factors), the more serious the fouling is, the smaller B2 is, but since the material of the scale is mainly calcified and does not absorb all optical signals, the value of B2 is greater than a1, the fouling degree can be divided into a plurality of different levels according to the different fouling thicknesses, and the fouling degree is determined according to the range of the output voltage value, the fouling thickness of the outer surface of the light reflection part and the voltage value of the feedback electrical signal of the photodetection element have a lookup table, as shown in table 1, the fouling thickness corresponding to the current voltage value is found according to the lookup table, wherein, the thicknesses are quantized into different levels in table 1, and the identification and determination are more convenient.
| Degree of scaling (grade) | B2 Voltage value Range (V) |
| 1 | 4.3V—4.8V |
| 2 | 3.8V—4.3V |
| 3 | Less than 3.8V |
TABLE 1
When the water is in a water state and scales, the infrared light emitted by the light emitting part 131 is refracted into the water and the light flux absorbed by the water is reduced due to the influence of the scales, so that the intensity of the signal reflected to the receiving end is increased, a low voltage value A2 (A2 > = A1) is output, and the more serious the scales are, the larger A2 is; the processing module in the scheme can also adopt fuzzy control to judge the scaling degree according to the B2 value and the A2 value.
When the scaling thickness is larger than the set threshold value, a prompt signal is output to the microprocessor and displayed to a display screen of the water heater or transmitted through communication, and a user is reminded to carry out scaling treatment by alarming.
The liquid level detection device detects the state of the liquid level in the water tank, the processing module can also realize the control of automatically starting water feeding when the water level is analyzed and judged to be lower than the lower limit value, when the water level is not lower than the upper limit value, the output signal is fed back to the microprocessor and the control circuit system is controlled to realize the control of automatically stopping water feeding, and at the moment, a water valve is required to be arranged in the water inlet pipeline to receive the control of the processing module.
The outer surface of the hollow tube 11 is provided with a first heat insulation layer 111, a heat conduction layer 112 and a second heat insulation layer 113 in sequence from inside to outside, and the light reflection part 133 protrudes out of the second heat insulation layer 113 and is used for contacting with water or air in the water tank. Wherein, be located the hot water direct contact in outermost second insulating layer 113 and the water tank, play the effect of preliminary heat insulation, prevent hydrothermal high temperature transmission to hollow tube 11, protect its inside electrical part, still there is some heat to pass through second insulating layer 113, inward transmission, through setting up heat-conducting layer 112, can go out the heat conduction of transmitting to heat-conducting layer 112, heat-conducting layer 112 is along the both ends that extend to the hollow tube, one of them one end of hollow tube can stretch out the water tank outside, and then with heat conduction to the water tank outside, the outer wall setting of hollow tube 11 is hugged closely to first insulating layer 111, can play the effect of further protection hollow tube 11. The heat conducting layer 112 can be realized by a metal sheet, so that double protection of heat insulation and effective heat dissipation is realized, and the use is safe. Through the voltage signal of liquid level detection device feedback, can judge the scale deposit condition that corresponds, realize the function of intelligent monitoring scale deposit to remind the user to handle, with the rate of accuracy and the life that improve level sensor.
When the water tank is in a non-full water state and the liquid level detection device is in a non-scaling state, the steam condition can be detected according to the liquid level detection device of the water-free part, and then whether the water is in a boiling state or not is judged. The specific mode is as follows: when water is in a boiling state, a large amount of water vapor is generated above the water tank, and the water vapor can cause that the inner medium and the outer medium of the photoelectric probe are different (the inner medium is air and the outer medium is water vapor) to a certain degree, so that the output voltage is reduced (the reduction value is smaller than the influence caused by scaling). The fuzzy detection mode can be compared with the output value of the temperature sensor to check whether the sensor is in a normal working state.
The surface of hollow tube 11 still is provided with temperature sensor 14 for detect the temperature, and temperature sensor 14's communication line can be through the cavity wiring in the hollow tube 11, through the thermal-insulated protection of multilayer in the cavity, and the temperature is lower, is favorable to prolonging the life of device.
One end of the hollow pipe 11 is provided with an opening, and the opening part is sealed by a sealing plug 15, so that detection devices and wires can be conveniently arranged.
The sealing plug 15 can be realized by a threaded plug, and the processing module is packaged in the sealing plug 15, and the part is positioned outside the water tank and is not influenced by high-temperature water vapor.
In a second embodiment, the present embodiment provides a solar water heater, which includes a water tank, wherein a liquid level detection device is disposed in the water tank, and the liquid level detection device is as described in the first embodiment, which is not described herein again.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. The liquid level detection device is characterized by comprising a hollow tube, wherein a closed cavity is formed in the hollow tube, a plurality of photoelectric detection elements are arranged in the hollow tube along the length direction of the hollow tube, each photoelectric detection element comprises a light emitting part, a light receiving part and a light reflecting part, the light emitting parts and the light receiving parts are located in the cavities, at least part of the light reflecting parts penetrate through the side wall of the hollow tube and extend out of the hollow tube, the light emitting parts emit light rays towards the light emitting parts, the light rays are reflected back by the light reflecting parts and received by the light receiving parts, the light receiving parts generate corresponding electric signals according to the received light rays and send the electric signals to a processing module, and the processing module judges the current liquid level according to the electric signals sent by the light receiving parts;
the processing module also comprises a step of judging the scaling thickness of the outer surface of each light reflection part and correcting the electric signal fed back by the photoelectric detection element according to the scaling thickness;
the outer surface scaling thickness of the light reflection part and the voltage value of the electric signal fed back by the photoelectric detection element are provided with a lookup table, and the scaling thickness corresponding to the current voltage value is found out according to the lookup table.
2. The liquid level detection device of claim 1, wherein the processing module determines the current liquid level by: the processing module respectively judges the electric signals fed back by the photoelectric detection elements, if the voltage value of the electric signals is not less than B1, the photoelectric detection elements are judged to have no water at the corresponding height position in the water tank, if the voltage value of the electric signals is not more than A1, the photoelectric detection elements are judged to have water at the corresponding height position in the water tank, wherein A1 is less than B1.
3. The liquid level detecting apparatus according to claim 2, wherein, among all the photoelectric detecting elements which are judged to have water at the height position corresponding to the water tank at the same time, the height position corresponding to the photoelectric detecting element with the highest position is the liquid level at the time.
4. The apparatus of claim 2, wherein if the voltage of the electrical signal is greater than A1 and less than B1, it is determined that the photoelectric detection element is not water at the corresponding height position in the water tank and the outer surface of the light emitting portion is scaled.
5. The liquid level detection device of claim 1, further comprising the step of warning descaling when the scale formation thickness is greater than a set threshold.
6. The liquid level detecting device according to any one of claims 1 to 4, wherein a first heat insulating layer, a heat conducting layer and a second heat insulating layer are sequentially arranged on the outer surface of the hollow tube from inside to outside, and the light reflecting part protrudes out of the second heat insulating layer.
7. The liquid level detection device according to any one of claims 1 to 4, wherein the outer surface of the hollow tube is further provided with a temperature sensor.
8. A solar water heater comprising a water tank, wherein the water tank is provided with a liquid level detection device as claimed in any one of claims 1-7.
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| CN112113634B (en) * | 2020-09-11 | 2024-03-15 | 王宇兴 | Liquid level early warning method for cross verification of LED light and conductive probe |
| CN112998595A (en) * | 2021-04-16 | 2021-06-22 | 深圳市杉川机器人有限公司 | Clear water tank assembly and steam engine and floor washing machine with same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4286464A (en) * | 1980-01-14 | 1981-09-01 | Technical Development Company | Optical fluid level monitor |
| CN102095472A (en) * | 2010-12-26 | 2011-06-15 | 河海大学常州校区 | Reflection type photoelectric sensor |
| CN102645253A (en) * | 2012-04-26 | 2012-08-22 | 北京宝力马传感技术有限公司 | Photoelectric continuous liquid level measuring method and device |
| GB2544868A (en) * | 2015-09-21 | 2017-05-31 | David Scott Nigel | A non-intrusive fluid level monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1382946A1 (en) * | 2002-07-15 | 2004-01-21 | Product Innovation Limited | Level sensors |
| US20120138824A1 (en) * | 2010-12-03 | 2012-06-07 | Fang Wen | Continuous liquid level sensor having multiple light sources and light receiving devices |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4286464A (en) * | 1980-01-14 | 1981-09-01 | Technical Development Company | Optical fluid level monitor |
| CN102095472A (en) * | 2010-12-26 | 2011-06-15 | 河海大学常州校区 | Reflection type photoelectric sensor |
| CN102645253A (en) * | 2012-04-26 | 2012-08-22 | 北京宝力马传感技术有限公司 | Photoelectric continuous liquid level measuring method and device |
| GB2544868A (en) * | 2015-09-21 | 2017-05-31 | David Scott Nigel | A non-intrusive fluid level monitoring system and method |
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Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant after: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant before: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant before: QINGDAO HAIER JOINT STOCK Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |