CN112325976B - Liquid level sensor and liquid level detection system - Google Patents
Liquid level sensor and liquid level detection system Download PDFInfo
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- CN112325976B CN112325976B CN202011170620.1A CN202011170620A CN112325976B CN 112325976 B CN112325976 B CN 112325976B CN 202011170620 A CN202011170620 A CN 202011170620A CN 112325976 B CN112325976 B CN 112325976B
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- resistor strip
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- 239000007788 liquid Substances 0.000 title claims abstract description 195
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 25
- 230000009471 action Effects 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims description 26
- 229910052755 nonmetal Inorganic materials 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 238000001914 filtration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 241000973497 Siphonognathus argyrophanes Species 0.000 description 1
- WVBBEXUPQJVOKO-UHFFFAOYSA-N [Sn].[Mn].[Ag] Chemical compound [Sn].[Mn].[Ag] WVBBEXUPQJVOKO-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- WBLJAACUUGHPMU-UHFFFAOYSA-N copper platinum Chemical compound [Cu].[Pt] WBLJAACUUGHPMU-UHFFFAOYSA-N 0.000 description 1
- QOGLYAWBNATGQE-UHFFFAOYSA-N copper;gold;silver Chemical compound [Cu].[Au][Ag] QOGLYAWBNATGQE-UHFFFAOYSA-N 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical compound [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention relates to the technical field of liquid level detection and discloses a liquid level sensor and a liquid level detection system. An anode resistor strip and a cathode resistor strip are fixed in the tube body with an opening at one end, and the anode resistor strip and the cathode resistor strip are arranged at intervals in parallel. The tube body is internally provided with a slip ring, and the slip ring is contacted with the positive and negative electrode resistor bars. The outer periphery of the pipe body is sleeved with an annular floater, the annular floater slides along the pipe body under the action of buoyancy and drives the sliding ring inside the pipe body to slide along the positive and negative electrode resistor strips, and the positions of contact points of the sliding ring on the positive and negative electrode resistor strips respectively are changed, so that the resistance value of an internal loop of the liquid level sensor is changed. The internal resistance value of the liquid level sensor changes along with the liquid level change of the liquid to be detected, and the liquid level condition of the liquid to be detected can be monitored in real time according to the change condition of the internal resistance value of the liquid level sensor.
Description
Technical Field
The invention relates to the technical field of liquid level detection, in particular to a liquid level sensor and a liquid level detection system.
Background
Currently, sensors available for measuring the liquid level of cryogenic liquids below-150 ℃ are of a few types, and differential pressure type and capacitive type liquid level sensors are more commonly used systems for detecting the liquid level of the cryogenic liquids. The differential pressure type liquid level sensor detects the height of the liquid level by utilizing the pressure generated by the liquid column, and after the liquid level changes, the pressure difference measured by the differential pressure transmitter also changes, and a linear relation exists between the differential pressure type liquid level sensor and the liquid level sensor. The capacitive liquid level sensor is characterized in that the capacitive liquid level sensor is inserted into a measured medium, the depth of an electrode immersed in the medium changes along with the height of a material level, the medium between the electrodes rises and falls, and the capacitance between two polar plates is necessarily changed, so that the liquid level change can be detected. However, the differential pressure type liquid level sensor has the advantages of complex sampling system, long connecting pipeline, more valves and easy blockage or leakage; one sampling tube needs to be directly led out from the bottom of the container, so that the cold conduction is serious; the time for establishing the stable differential pressure condition under the working conditions of fluid infusion and evacuation is longer, and the recovery time is longer. The capacitance type liquid level meter mainly relies on the capacitance change between two electrodes, so that fog can influence the detection accuracy and is easy to influence the measurement result by surrounding electromagnetic interference.
Disclosure of Invention
Based on this, it is necessary to provide a liquid level sensor and a liquid level detection system for solving the problem that a measurement system capable of accurately measuring the liquid level of a cryogenic liquid is lacking at present.
A liquid level sensor comprises a tube body with an opening at one end; the positive electrode resistor strip is fixed in the pipe body, and the extending direction of the positive electrode resistor strip is the same as the extending direction of the pipe body; the negative electrode resistor strip is fixed in the pipe body and is parallel to the positive electrode resistor strip; the slip ring is arranged in the pipe body and is in contact with the positive electrode resistor strip and the negative electrode resistor strip; the annular floater is sleeved on the outer surface of the pipe body, slides along the pipe body under the action of buoyancy, and drives the slip ring to slide along the positive electrode resistance strip and the negative electrode resistance strip so as to adjust the resistance of the liquid level sensor.
Above-mentioned liquid level sensor, be fixed with an anodal resistance strip and a negative pole resistance strip in the body that one end had the opening, anodal resistance strip with parallel interval sets up between the negative pole resistance strip. The tube body is internally provided with a slip ring which is respectively contacted with the positive electrode resistor strip and the negative electrode resistor strip. The outer periphery of the pipe body is sleeved with an annular floater, the annular floater slides along the pipe body under the action of buoyancy and drives the slip ring inside the pipe body to slide along the positive electrode resistor strip and the negative electrode resistor strip, so that the positions of contact points of the slip ring on the positive electrode resistor strip and the negative electrode resistor strip respectively are changed. And after one ends of the positive electrode resistor strip and the negative electrode resistor strip are connected with voltage, a loop is formed by connecting the positive electrode resistor strip and the negative electrode resistor strip with the slip ring, and the resistance value on the loop is related to the position of the contact point of the slip ring and the positive electrode resistor strip and the position of the contact point of the negative electrode resistor strip. The internal resistance value of the liquid level sensor changes along with the liquid level change of the liquid to be detected, and the liquid level condition of the liquid level to be detected can be monitored in real time according to the change condition of the internal resistance value of the liquid level sensor. Because the liquid level sensor body is free of electronic elements, the magnetic component cannot demagnetize at low temperature, and therefore the liquid level sensor can be used for accurately measuring the liquid level of cryogenic liquid for a long time.
In one embodiment, the slip ring comprises a soft magnetic outer ring, is arranged in the pipe body, and is positioned at the periphery of the positive electrode resistance strip and the negative electrode resistance strip; the sliding contact is positioned in the soft magnetic outer ring and fixedly connected with the soft magnetic outer ring; the sliding contact is contacted with the positive electrode resistor strip and the negative electrode resistor strip.
In one embodiment, the sliding contact is fixedly connected to the soft magnetic outer ring via a non-conductive non-metallic connection.
In one embodiment, a sliding groove is formed in the inner wall of the pipe body, and the sliding groove extends along the length direction of the pipe body; the soft magnetic outer ring is also provided with a first protruding structure on the outer side, and the first protruding structure is embedded into the sliding groove.
In one embodiment, the annular float comprises an annular float housing, which is sleeved outside the tube body and has a cavity therein; and the annular magnet is positioned in the cavity and extends to the outer surface of the tube body.
In one embodiment, the liquid level sensor further comprises a cover body covering the opening to form a sealed cavity in the tube body; the positive electrode resistor strip, the negative electrode resistor strip and the slip ring are all positioned in the sealing cavity; one end of the positive terminal penetrates through the cover body and is connected with the positive resistor strip through a flexible wire, and the other end of the positive terminal extends to the upper part of the cover body; and one end of the negative terminal penetrates through the cover body and is connected with the negative resistor strip through a flexible wire, and the other end of the negative terminal extends to the upper part of the cover body.
In one embodiment, the sealed cavity is filled with an inert gas.
In one embodiment, the liquid level sensor further comprises a non-conductive nonmetallic floating ring, wherein the non-conductive nonmetallic floating ring is positioned in the pipe body and above the positive resistance strip and the negative resistance strip; one end of each tension spring is connected with the cover body, and the other end of each tension spring is connected with the nonmetal floating ring; the non-conductive nonmetal plate is positioned in the pipe body, is positioned below the positive electrode resistor strip and the negative electrode resistor strip, and forms an accommodating space at the bottom of the pipe body; the uniform ends of the positive electrode resistor strips and the negative electrode resistor strips are connected with the nonmetal plate, and the other ends of the positive electrode resistor strips and the negative electrode resistor strips are connected with the nonmetal floating ring; and the balancing weight is positioned in the accommodating space.
In one embodiment, a sliding groove is formed in the inner wall of the pipe body, and the sliding groove extends along the length direction of the pipe body; the outer side of the nonmetallic floating ring is also provided with a second protruding structure, and the second protruding structure is embedded into the chute.
A liquid level detection system comprises a container for containing liquid to be detected; the level sensor of any one of the above embodiments, the level sensor portion being located within the container; the power supply module is respectively connected with the positive electrode resistor strip and the negative electrode resistor strip and is used for providing voltage for the positive electrode resistor strip and the negative electrode resistor strip; the current signal output module is connected with the liquid level sensor and is used for outputting a corresponding current value according to the change of the resistance value of the liquid level sensor; the temperature sensor is arranged in the container and used for detecting the temperature of the liquid to be detected; the temperature output module is connected with the temperature sensor and is used for outputting the measured result of the temperature sensor; the processing module is connected with the current signal output module and the temperature output module and is used for processing the current value output by the current signal output module to obtain the liquid level value of the liquid to be detected and calibrating the liquid level value according to the result output by the temperature output module; and the display module is connected with the processing module and is used for displaying the liquid level value and the temperature.
In one embodiment, the power supply device includes: a power module for providing a voltage; the voltage stabilizing module is connected with the power module, the positive electrode resistor strip and the negative electrode resistor strip and is used for stabilizing the voltage provided by the power module and providing the voltage to the positive electrode resistor strip and the negative electrode resistor strip.
Drawings
FIG. 1 is a front cross-sectional view of a fluid level sensor according to one embodiment of the present invention;
FIG. 2 is a cross-sectional view of a slip ring according to one embodiment of the present invention;
FIG. 3 is a cross-sectional view of the structure of an annular float according to one embodiment of the invention;
FIG. 4 is a front cross-sectional view of a fluid level sensor according to another embodiment of the present invention;
FIG. 5 is a left side cross-sectional view of a fluid level sensor according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of a liquid level detection system according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a power module according to an embodiment of the invention;
fig. 8 is a signal processing flow chart of a processing module according to an embodiment of the invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "axial," and the like as used herein are based on the orientation or positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a front cross-sectional view of a fluid level sensor according to one embodiment of the present invention, which includes a tube 101, a positive resistor 102, a negative resistor 103, a slip ring 104, and an annular float 105. The tube body 101 of the liquid level sensor 10 is a long tube structure with one end open and a hollow inside. The positive electrode resistor strip 102 and the negative electrode resistor strip 103 are both arranged in the pipe body 101, a certain distance is reserved between the positive electrode resistor strip 102 and the negative electrode resistor strip 103, the positive electrode resistor strip 102 and the negative electrode resistor strip 103 are arranged in parallel, and the positive electrode resistor strip 102 and the negative electrode resistor strip 103 are not contacted with each other. The extending direction of the positive electrode resistor bar 102 is the same as the extending direction of the tube body 101, that is, the positive electrode resistor bar 102 and the negative electrode resistor bar 103 are parallel to the tube wall of the tube body 101. The slip ring 104 is disposed inside the pipe body 101, the slip ring 104 is respectively in contact with the positive electrode resistor strip 102 and the negative electrode resistor strip 103, and the contact point between the slip ring 104 and the positive electrode resistor strip 102 and the negative electrode resistor strip 103 changes along with the sliding of the slip ring 104.
An annular float 105 with buoyancy is sleeved outside the pipe body 101. The outer wall of the pipe body 101 is smooth and unobstructed, and the annular float 105 can slide smoothly between the two end points a-b on the pipe body 101, please refer to fig. 1, where the two end points a and b are located at the upper and lower ends of the pipe body 101 respectively. The annular floater 105 always floats on the surface of the liquid to be detected under the action of the buoyancy, and when the liquid level of the liquid to be detected changes, the annular floater 105 slides up and down on the outer side of the pipe body 101 along with the change of the liquid level. When the ring-shaped floater 105 slides, the sliding ring 104 in the pipe body 101 is driven to slide, namely, the sliding ring 104 can also slide smoothly between the two end points a-b in the pipe body 101.
The ends of the positive electrode resistor strip 102 and the negative electrode resistor strip 103, which are close to the opening of the pipe body 101, are used for being connected with an external power supply, after the positive electrode resistor strip 102 and the negative electrode resistor strip 103 are connected with the external power supply, an electric signal flows from the end of the positive electrode resistor strip 102, which is close to the opening of the pipe body 101, to the contact point with the slip ring 104, and after passing through the slip ring 104, is transmitted from the contact point of the negative electrode resistor strip 103 and the slip ring 104 to the end of the negative electrode resistor strip 103, which is close to the opening of the pipe body 101, so that a loop is formed. Because the resistance value is related to the length of the resistive material, the resistance value within the level sensor 10 is related to the length of the positive and negative resistance strip access loop, which is determined by the position of the slip ring 104, when other determinants are unchanged. The ring-shaped floater 105 slides along with the change of the liquid level under the action of the buoyancy, and the position of the sliding ring 104 also slides along the positive electrode resistance bar and the negative electrode resistance bar along with the sliding of the ring-shaped floater 105. Therefore, the resistance value inside the liquid level sensor 10 changes with the change of the liquid level, and the liquid level of the liquid to be measured can be detected in real time by changing the resistance value of the liquid level sensor 10. Since the body of the liquid level sensor 10 has no electronic component, the magnetic component is not demagnetized at low temperature, and thus the liquid level sensor 10 can be applied to accurately measure the liquid level of cryogenic liquid for a long time.
In one embodiment, the materials of the positive electrode resistor strip 102 and the negative electrode resistor strip 103 are high-resistance alloy materials which can still maintain stable resistance in a cryogenic environment, and have small contact resistance, high chemical stability and good wear resistance. The high resistance alloy material includes, but is not limited to, platinum-based alloys, gold-based alloys, silver-based alloys, palladium-based alloys. In the preparation of the level sensor 10, the positive electrode resistor strip 102 and the negative electrode resistor strip 103 are selected, for example, resistor strips made of platinum rhodium, platinum iridium, platinum copper, gold silver copper, jin Nietong, jin Nie chromium, jin Batie aluminum, silver manganese tin, palladium silver copper, palladium molybdenum, and the like are selected. The material has small contact resistance, high chemical stability and good wear resistance, so that the material can still maintain stable performance for a long time in a cryogenic environment, and the liquid level sensor 10 is ensured not to be damaged due to the cryogenic environment. Therefore, the liquid level sensor 10 can be applied to liquid level detection of cryogenic liquid, can still perform long-time real-time detection in a cryogenic environment, and can realize high-precision detection.
Fig. 2 is a cross-sectional view of the slip ring 104, taken along and enlarged from the cross-sectional view, in one embodiment of the present invention, wherein the slip ring 104 includes a soft magnetic outer ring 106 and sliding contacts 107. The soft magnetic outer ring 106 is disposed inside the pipe body 101 and is located at the periphery of the positive electrode resistor strip 102 and the negative electrode resistor strip 103. Because the soft magnetic outer ring 106 is made of soft magnetic material, the soft magnetic outer ring 106 can shield most of the magnetic field, so as to prevent the positive and negative resistance strips in the pipe body 101 from being magnetized after long-term use, prolong the service life of the liquid level sensor 10, and ensure the accuracy of the liquid level measurement to be measured.
The sliding contact 107 is located inside the soft magnetic outer ring 106 and is fixedly connected with the soft magnetic outer ring 107, and the slip ring 104 is in contact with the positive electrode resistor strip 102 and the negative electrode resistor strip 103 through the sliding contact 107. The length of the sliding contact 107 is slightly larger than the distance between the positive electrode resistor strip 102 and the negative electrode resistor strip 103, two end points of the sliding contact 107 are respectively contacted with the positive electrode resistor strip 102 and the negative electrode resistor strip 103, and the positive electrode resistor strip and the negative electrode resistor strip form a loop with the sliding contact 107. In addition, the end surfaces at the two ends of the sliding contact 107 have a certain radian, so as to increase the contact surface between the sliding contact and the positive and negative electrode resistor bars, thereby improving the conductive stability.
Since the slip ring 104 slides up and down inside the pipe body 101 with the sliding of the ring-shaped float 105, the position of the sliding contact 107 is changed accordingly, and the two contacts of the sliding contact 107, which are in contact with the positive electrode resistive strip 102 and the negative electrode resistive strip 103, respectively, slide on the positive electrode resistive strip 102 and the negative electrode resistive strip 103, respectively. The resistance value inside the level sensor 10 is related to the length of the positive and negative resistance bar access circuit, which is determined by the position of the sliding contact 107. It can be seen that the resistance value inside the liquid level sensor 10 will vary with the liquid level of the liquid to be measured.
In one embodiment, the slip ring 104 further includes a non-metallic connecting member 108, and the sliding contact 107 is fixedly connected to the soft magnetic outer ring 106 via the non-metallic connecting member 108. The nonmetallic connecting piece 108 is made of nonmetallic materials which are not conductive and magnetic, the nonmetallic connecting piece 108 has the same size as the diameter of the soft magnetic outer ring 106, and is fixed at a certain diameter position of the soft magnetic outer ring 106. The sliding contact 107 is fixed at the center of the non-metal connecting piece 108, and the sliding contact 107 is connected with the soft magnetic outer ring 106 through the non-metal connecting piece 108.
In one embodiment, referring to fig. 4, a chute 110 is provided on the inner wall of the tube body, and the chute 110 extends along the length direction of the tube body, from the tube orifice to the bottom of the tube body. The outer side of the soft magnetic outer ring 106 is further provided with a first protruding structure 109, and the first protruding structure 109 is embedded in the sliding groove 110. The first projection 109 has a shape and a size matching the slot size of the chute 110, and the first projection 109 can be just embedded in the chute 110 and can slide freely in the chute 110 along the track defined by the chute 110. The first protrusion structure 109 may be used to prevent the soft magnetic outer ring 106 from rotating when sliding inside the pipe body 101, thereby affecting the level measurement accuracy of the level sensor 10.
Fig. 3 is a cross-sectional view of the ring-shaped float 105, which is an enlarged cross-sectional view of the structure of one embodiment of the present invention, wherein the ring-shaped float 105 includes a ring-shaped float housing 111 and a ring-shaped magnet 112. The annular float housing 111 is sleeved on the periphery of the pipe body 101, and a cavity is formed inside the annular float housing 111. The annular float 105 is provided with a cavity, so that the annular float has a certain buoyancy, floats on the liquid surface of the liquid to be detected under the action of the buoyancy, and slides on the outer pipe wall of the pipe body 101 along with the change of the liquid surface. A ring magnet 112 is disposed in the cavity of the annular float housing 111, the ring magnet 112 being located within the cavity and extending to the outer surface of the tube 101. The ring magnet 112 is attractive to a magnetic material, and since the soft magnetic outer ring 106 in the slip ring 104 is made of a soft magnetic material, the ring magnet 112 is attractive to the soft magnetic outer ring 106; the ring magnet 112 and the soft magnetic outer ring 106 are fixedly disposed inside the slip ring 104 and the ring float 105, respectively, so that a magnetic force is provided between the slip ring 104 and the ring float 105. The slip ring 104 and the ring float 105 are attracted to each other through a pipe wall by magnetic force, so that the slip ring 104 slides inside the pipe body 101 along with the sliding of the ring float 105, thereby changing the resistance value on the circuit formed by the positive and negative electrode resistance strips and the sliding contact 107.
In one embodiment, the annular float 105 further includes a magnetic ring gland 113, where the magnetic ring gland 113 covers the cavity of the annular float housing 111, so that a closed cavity is formed in the annular float housing 111, so that the annular magnet 112 is fixed in the cavity of the annular float 105, and is prevented from leaking or changing under the action of external force, so as to affect the measurement of the liquid level sensor 10.
Fig. 4 is a front sectional view of a liquid level sensor according to another embodiment of the present invention, and fig. 5 is a left sectional view of a liquid level sensor according to one embodiment of the present invention, wherein the liquid level sensor 10 further includes a cover 114, a positive terminal 115, and a negative terminal 116. The cover 114 is made of non-conductive non-metal material and covers the opening of the tube body 101, and the cover 114 is connected with the tube mouth of the tube body 101 in a sealing manner, so that the interior of the tube body 101 is sealed to form a sealing cavity in the tube body. The positive electrode resistor bar 102, the negative electrode resistor bar 103 and the slip ring 104 are all positioned in the sealed cavity. One end of the positive terminal 115 penetrates through the cover 114 and is connected with the positive resistor strip 102 via a flexible wire, and the other end of the positive terminal 115 extends above the cover 114 for accessing an external circuit. One end of the negative terminal 116 penetrates through the cover 114 and is connected with the negative resistor strip 103 via a flexible wire, and the other end of the negative terminal 116 extends above the cover 114 for accessing an external circuit.
When the liquid level sensor 10 is used for measuring the liquid level of the liquid to be measured, an operating power supply needs to be input to the liquid level sensor 10. The positive electrode terminal 115 is connected with a positive electrode output end of an external power supply, the negative electrode terminal 116 is connected with a negative electrode output end of the external power supply, the external power supply is connected through a positive electrode terminal and a negative electrode terminal, and working voltage is transmitted to the positive electrode resistance strip and the negative electrode resistance strip through flexible wires, and the positive electrode resistance strip and the negative electrode resistance strip form a closed loop in the pipe body 101 through the sliding contact 107. Because the resistance value of the resistor is related to the length of the resistive material, when the liquid level of the liquid to be measured changes, the positions of the sliding contacts 107 and the contacts of the positive and negative resistance strips respectively also change, and the length of the positive and negative resistance strips connected into the closed loop also changes, so that the resistance value of the liquid level sensor 10 changes along with the change of the liquid level, and the liquid level information of the liquid to be measured can be obtained by processing the resistance value of the change of the liquid level sensor 10.
In one embodiment, the sealed cavity is filled with an inert gas. The inside of the sealed cavity formed by the airtight connection of the tube body 101 and the cover body 114 is filled with an inert gas. The inert gas may be used to ensure that the physical characteristics of the metal components within the tube 101 remain stable for a long period of time, so as to ensure that the liquid level sensor 10 is capable of performing long-term measurements on cryogenic liquids, while ensuring measurement accuracy under long-term measurements. The inert gas includes, but is not limited to, helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the like.
In one embodiment, the fluid level sensor 10 further includes a non-metallic floating ring 117, a plurality of tension springs 118, a non-metallic plate 119, and a weight 120. The nonmetallic floating ring 117 and the nonmetallic plate 119 are each made of a nonmetallic material that is nonconductive. The nonmetallic floating ring 117 is located in the sealed cavity of the pipe body and above the positive electrode resistor strip 102 and the negative electrode resistor strip 103, and is near the opening of the pipe body 101. One end of each of the plurality of tension springs 118 is connected with the cover 114, and the other end of each of the plurality of tension springs 118 is connected with the nonmetallic floating ring 117, namely, the cover 114 is connected with the nonmetallic floating ring 117 through the plurality of tension springs 118. The nonmetallic floating ring 117 can slide smoothly inside the pipe body 101 under the elastic force of the tension spring 118. In this embodiment, the number of the tension springs 118 is 2 or more.
The nonmetallic plate 119 is disposed inside the pipe body 101 and below the positive electrode resistor bar 102 and the negative electrode resistor bar 103. The non-metal plate 119 is fixed to the bottom of the pipe body 101, and forms an accommodating space at the bottom of the pipe body 101. The positive electrode resistor bar 102 and the negative electrode resistor bar 103 are connected at one end to the nonmetallic plate 119, and connected at the other end to the nonmetallic floating ring 117. The balancing weight 120 is arranged in the accommodating space, and the balancing weight 120 is placed in the accommodating space to accommodate the balancing weight, so that the position of the balancing weight 120 can be prevented from being displaced in the process of installing, moving and the like of the liquid level sensor 10, and the influence on other structures and functions in the liquid level sensor 10 tube can be prevented. The balancing weight 120 is disposed at the bottom of the pipe 101 and can be used to make the bottom of the liquid level sensor 10 sink into the measured liquid, and make the bottom of the liquid level sensor 10 always keep vertical in the measured liquid in a manner of sinking during the liquid level measurement.
The positive electrode resistor bar 102 and the negative electrode resistor bar 103 are both fixed on the nonmetallic floating ring 117 at one end and on the nonmetallic plate 119 at the other end. Since the nonmetallic floating ring 117 is fixed to the cover 114 by the tension spring 118, the positions of the cover 114 and the nonmetallic plate 119 are fixed, and the tension spring 118 has elastic force, and after the tension spring 118 is connected with the nonmetallic floating ring 117, the tension spring 118 can exert a tensile force on the nonmetallic floating ring 117. The nonmetallic floating ring 117 may freely slide inside the pipe body 101, so that the nonmetallic floating ring 117 may drive one end of the positive and negative resistance strip connected thereto to tighten in the direction of the cover 114 under the action of the tension spring 118. And because the other end of the positive and negative resistance bar is fixed on the nonmetal plate 119 at the bottom of the tube body 101, the positive and negative resistance bar is always subjected to a tensile force, so that the positive and negative resistance bar is always kept in a tensioning state. The positive and negative resistance bars are always kept in a tensioning state, so that the contact between the sliding contact 107 and the positive and negative resistance bars can be kept highly reliable, poor contact between the sliding contact 107 and the positive and negative resistance bars is prevented, and the stability of a connecting passage between the positive and negative resistance bars and the sliding contact 107 is affected.
In one embodiment, referring to fig. 4, a chute 110 is provided on the inner wall of the tube body, and the chute 110 extends along the length direction of the tube body, from the tube orifice to the bottom of the tube body. The outer side of the nonmetallic floating ring 117 is also provided with a second protruding structure 121, and the second protruding structure 121 is embedded into the chute. The shape and size of the second protruding structure 121 are matched with those of the slot of the chute 110, and the second protruding structure 121 can be just embedded into the chute 110 and can freely slide in the track defined by the chute 110. The second protrusion structure 121 is disposed on the outer side of the non-metal floating ring 117, and is used for defining a moving track of the non-metal floating ring 117, so as to prevent the non-metal floating ring 117 from rotating in a horizontal direction, thereby affecting the liquid level measurement of the liquid level sensor 10.
Fig. 6 is a schematic structural diagram of a liquid level detection system according to one embodiment of the present invention, and in one embodiment, the present invention further provides a liquid level detection system, which includes the liquid level sensor 10, the container 20, the power supply module 30, the current signal output module 40, the temperature sensor 50, the temperature output module 60, the processing module 70, and the display module 80 according to any one of the above embodiments. The liquid level sensor 10 is partially located in the container 20, and the container 20 is used for containing liquid to be measured. In this embodiment, the liquid to be measured is a cryogenic liquid. When the cryogenic liquid is injected into the container 20, the annular float 105 with a certain buoyancy on the liquid level sensor 10 slides on the pipe body 101 along with the change of the liquid level, and drives the slip ring 104 in the pipe body 101 to slide on the positive and negative electrode resistance bars, so that the resistance value of the internal loop of the liquid level sensor 10 changes along with the change of the liquid level in the container 20.
The positive output end of the power supply module 30 is connected with the positive resistor strip 102, and the negative output end is connected with the negative resistor strip 103. The power supply module 30 is configured to provide a voltage to the liquid level sensor 10. The current signal output module 40 is connected to the liquid level sensor 10. When the resistance value of the liquid level sensor 10 changes with the change of the liquid level, since the voltage value applied to the liquid level sensor 10 is fixed, the current value outputted by the current signal output module 40 also changes, and the current value outputted by the current signal output module 40 corresponds to the resistance value of the liquid level sensor 10. The processing module 70 is connected to the current signal output module 40, and the processing module 70 receives the current value output by the current signal output module 40 and performs analysis processing on the current value in real time to obtain a liquid level value of the cryogenic liquid in the container 20.
The temperature sensor 50 is disposed in the container 20, and in this embodiment, the temperature sensor 50 is disposed at the bottom of the liquid level sensor 10, and when the liquid level sensor 10 is immersed in the cryogenic liquid, the temperature sensor 50 is also immersed in the cryogenic liquid. The temperature sensor 50 is used to measure the temperature of the cryogenic liquid. When the temperature of the cryogenic liquid changes, the temperature sensor 50 outputs an electrical signal corresponding to the temperature change. The temperature output module 60 is connected to the temperature sensor 50, and is configured to output a measurement result of the temperature sensor 60. The processing module 70 is further connected to the temperature sensor 50, and is configured to receive an electrical signal output by the temperature sensor 50. Because the resistance value of the resistive material is also changed when the temperature of the environment in which the resistive material is located changes, when the cryogenic liquid changes greatly, the resistance value of the liquid level sensor 10 may be affected, thereby affecting the detection accuracy of the liquid level sensor 10 for liquid level measurement. After the processing module 70 calculates and obtains the liquid level value, the processing module calibrates the liquid level value according to the received temperature detection result output by the temperature output module 60, so that the influence of temperature change on resistance value change can be effectively eliminated, and the measurement accuracy of the liquid level detection system when detecting the liquid level of the cryogenic liquid with larger temperature change is ensured. The display module 80 is connected to the processing module 70, and is configured to receive the liquid level value and the temperature, and display the liquid level value and the temperature. An operator can know the liquid level condition and the temperature condition of the liquid to be detected according to the information displayed on the display module 80, and the information obtained by the real-time detection of the liquid level detection system is conveyed more clearly and intuitively through the display module 80.
In one embodiment, the cover 114 is secured to the interior ceiling of the container 20. When the liquid level sensor 10 is installed in the container 20, the cover 114 at the top of the liquid level sensor 10 may be fixed with a top plate inside the container 20, so as to prevent the liquid level sensor 10 from rotating due to vortex caused by liquid injection when the liquid level sensor 10 injects the liquid to be measured into the container 20, thereby affecting the detection accuracy of the liquid level detection.
After the liquid level sensor 10 is fixed to the top of the container 20, the temperature sensor 50 is fixed to the bottom of the liquid level sensor 10, and a part of the body of the liquid level sensor 10 and the temperature sensor 50 are inserted into the container 20. The output end of the power supply module 30 is connected to the positive terminal 115 and the negative terminal 116, respectively, so as to form a closed loop with the positive and negative resistance bars and the sliding contact 107 inside the tube body 101. When the liquid to be measured is injected into the container 20, the annular float 105 outside the pipe body 101 floats on the liquid surface of the liquid to be measured, and the annular float 105 is driven to correspondingly rise and fall by the rise and fall of the liquid surface. Simultaneously, the ring-shaped floater 105 drives the slip ring 104 to slide together under the action of magnetic force, so that the sliding contact 107 slides on the positive and negative resistance bars, the length of the positive and negative resistance bars connected into the loop is changed, and the resistance value in the loop is correspondingly changed. The current signal output module 40 outputs a current value corresponding to the resistance value according to a change in the internal resistance value of the liquid level sensor 10. Because the resistance value of the resistance material changes along with the temperature change, the temperature of the liquid to be measured is detected by the temperature sensor 50 and is input into the processing module 70, so that the processing module 70 can perform numerical calibration on the liquid level value by using the detected temperature, thereby improving the measurement accuracy while ensuring that the liquid level of the liquid to be measured with larger temperature change can be measured in real time.
Fig. 7 is a schematic structural diagram of a power supply module according to an embodiment of the present invention, in which the power supply module 30 includes a power supply module 310 and a voltage stabilizing module 320. The power module 310 is used to provide the voltage required for the operation of the level sensor 10. The input end of the voltage stabilizing module 320 is connected with the output end of the power module 310; the positive output end of the voltage stabilizing module 320 is connected to the positive terminal 115, and the negative output end of the voltage stabilizing module 320 is connected to the negative terminal 116, so as to form a closed loop with the positive and negative resistor strips and the sliding contact 107 inside the tube body 101. The voltage stabilizing module 320 is configured to stabilize the voltage provided by the power module 310 and provide the voltage to the positive electrode resistor strip 102 and the negative electrode resistor strip 103, so as to ensure the stability of the output of the liquid level sensor 10 during the liquid level detection.
Fig. 8 is a signal processing flow chart of a processing module according to an embodiment of the present invention, in which the processing module 70 performs a signal processing process through the following functional units when processing the current signal output by the current signal output module 40. After the liquid level sensor 10 outputs the changed current value to the processing module 70 through the current signal output module 40, the primary filtering unit in the processing module 70 performs the first filtering on the current value to eliminate the larger interference signal in the current value. And amplifying the current value after the first filtering by a signal amplifying unit to realize signal enhancement. And then, carrying out secondary filtering on the enhanced current value through a secondary filtering unit, further eliminating interference signals and improving the stability of output signals. And performing data conversion on the current value subjected to the second filtering through an I-V conversion module, and converting the changed current value into a changed voltage value. The converted voltage value is converted into a digital voltage value through an ADC conversion circuit, and is sent into a microprocessor, and the digital voltage value is calculated, analyzed and processed by the microprocessor to obtain a liquid level value. When the microprocessor processes the digital voltage value to obtain the liquid level value, it receives the electric signal output by the temperature output module 60, and the microprocessor calibrates the liquid level value according to the electric signal output by the temperature output module 60, so as to effectively improve the output precision of the liquid level sensor 10.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A liquid level sensor, comprising:
a tube body having an opening at one end;
the positive electrode resistor strip is fixed in the pipe body, and the extending direction of the positive electrode resistor strip is the same as the extending direction of the pipe body;
the negative electrode resistor strip is fixed in the pipe body and is parallel to the positive electrode resistor strip;
the slip ring is arranged in the pipe body and is in contact with the positive electrode resistor strip and the negative electrode resistor strip;
the annular floater is sleeved on the outer surface of the pipe body, slides along the pipe body under the action of buoyancy force and drives the slip ring to slide along the positive electrode resistance strip and the negative electrode resistance strip so as to adjust the resistance of the liquid level sensor;
the liquid level sensor further includes:
the cover body covers the opening to form a sealed cavity in the pipe body; the positive electrode resistor strip, the negative electrode resistor strip and the slip ring are all positioned in the sealing cavity;
one end of the positive terminal penetrates through the cover body and is connected with the positive resistor strip through a flexible wire, and the other end of the positive terminal extends to the upper part of the cover body;
a negative electrode terminal, one end of which penetrates through the cover body and is connected with the negative electrode resistor strip through a flexible wire, and the other end of which extends to the upper part of the cover body;
a non-conductive nonmetallic floating ring which is positioned in the pipe body and above the positive electrode resistance strip and the negative electrode resistance strip;
one end of each tension spring is connected with the cover body, and the other end of each tension spring is connected with the nonmetal floating ring;
the non-conductive nonmetal plate is positioned in the pipe body, is positioned below the positive electrode resistor strip and the negative electrode resistor strip, and forms an accommodating space at the bottom of the pipe body; the uniform ends of the positive electrode resistor strips and the negative electrode resistor strips are connected with the nonmetal plate, and the other ends of the positive electrode resistor strips and the negative electrode resistor strips are connected with the nonmetal floating ring;
and the balancing weight is positioned in the accommodating space.
2. The fluid level sensor of claim 1, wherein the slip ring comprises:
the soft magnetic outer ring is arranged in the pipe body and positioned at the peripheries of the positive electrode resistor strip and the negative electrode resistor strip;
the sliding contact is positioned in the soft magnetic outer ring and fixedly connected with the soft magnetic outer ring; the sliding contact is contacted with the positive electrode resistor strip and the negative electrode resistor strip.
3. The fluid level sensor of claim 2, wherein the sliding contact is fixedly connected to the soft magnetic outer ring via a non-conductive non-metallic connection.
4. The liquid level sensor according to claim 2, wherein the inner wall of the pipe body is provided with a chute, and the chute extends along the length direction of the pipe body; the soft magnetic outer ring is also provided with a first protruding structure on the outer side, and the first protruding structure is embedded into the sliding groove.
5. The fluid level sensor of claim 2, wherein the annular float comprises:
the annular float shell is sleeved outside the pipe body and is internally provided with a cavity;
and the annular magnet is positioned in the cavity and extends to the outer surface of the tube body.
6. The fluid level sensor of claim 1, wherein the sealed cavity is filled with an inert gas.
7. The liquid level sensor according to claim 1, wherein the inner wall of the pipe body is provided with a chute, and the chute extends along the length direction of the pipe body; the outer side of the nonmetallic floating ring is also provided with a second protruding structure, and the second protruding structure is embedded into the chute.
8. The fluid level sensor of claim 1, wherein the positive resistive strip and the negative resistive strip are made of one of a platinum-based alloy, a gold-based alloy, a silver-based alloy, or a palladium-based alloy.
9. A liquid level detection system, comprising:
a container for holding a liquid to be measured;
the level sensor of any one of claims 1 to 8, the level sensor being located partially within the container;
the power supply module is respectively connected with the positive electrode resistor strip and the negative electrode resistor strip and is used for providing voltage for the positive electrode resistor strip and the negative electrode resistor strip;
the current signal output module is connected with the liquid level sensor and is used for outputting a corresponding current value according to the change of the resistance value of the liquid level sensor;
the temperature sensor is arranged in the container and used for detecting the temperature of the liquid to be detected;
the temperature output module is connected with the temperature sensor and is used for outputting the measured result of the temperature sensor;
the processing module is connected with the current signal output module and the temperature output module and is used for processing the current value output by the current signal output module to obtain the liquid level value of the liquid to be detected and calibrating the liquid level value according to the result output by the temperature output module;
and the display module is connected with the processing module and is used for displaying the liquid level value and the temperature.
10. The fluid level detection system of claim 9, wherein the power module comprises:
a power module for providing a voltage;
the voltage stabilizing module is connected with the power module, the positive electrode resistor strip and the negative electrode resistor strip and is used for stabilizing the voltage provided by the power module and providing the voltage to the positive electrode resistor strip and the negative electrode resistor strip.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309542A (en) * | 1968-12-19 | 1973-03-14 | Barton W B | Liquid level sensors |
| US3792456A (en) * | 1971-09-18 | 1974-02-12 | Lucas Ltd Joseph | Liquid level detection systems |
| US4637254A (en) * | 1984-10-10 | 1987-01-20 | Tokheim Corporation | Gauge apparatus for measuring liquid levels |
| GB0206726D0 (en) * | 2002-03-21 | 2002-05-01 | Fozmula Ltd | Liquid level sensor |
| CN1512148A (en) * | 2002-12-31 | 2004-07-14 | 北京怡诚机电设备公司 | Liquid level measurer based on eddy effect |
| US7062966B1 (en) * | 2005-02-03 | 2006-06-20 | Delphi Technologies, Inc. | Fuel level sensor |
| JP2014235152A (en) * | 2013-06-05 | 2014-12-15 | 矢崎総業株式会社 | Contact unit of variable resistance type liquid level sensor |
| CN105675092A (en) * | 2016-03-04 | 2016-06-15 | 温州瓯云科技有限公司 | Miniature high-precision liquid level sensor |
| CN107478306A (en) * | 2017-10-10 | 2017-12-15 | 中国计量大学 | A kind of storage tank liquid-level meter field calibration device |
| CN206818279U (en) * | 2017-04-13 | 2017-12-29 | 鸿准精密模具（昆山）有限公司 | Liquid level gauge |
-
2020
- 2020-10-28 CN CN202011170620.1A patent/CN112325976B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309542A (en) * | 1968-12-19 | 1973-03-14 | Barton W B | Liquid level sensors |
| US3792456A (en) * | 1971-09-18 | 1974-02-12 | Lucas Ltd Joseph | Liquid level detection systems |
| US4637254A (en) * | 1984-10-10 | 1987-01-20 | Tokheim Corporation | Gauge apparatus for measuring liquid levels |
| GB0206726D0 (en) * | 2002-03-21 | 2002-05-01 | Fozmula Ltd | Liquid level sensor |
| CN1512148A (en) * | 2002-12-31 | 2004-07-14 | 北京怡诚机电设备公司 | Liquid level measurer based on eddy effect |
| US7062966B1 (en) * | 2005-02-03 | 2006-06-20 | Delphi Technologies, Inc. | Fuel level sensor |
| JP2014235152A (en) * | 2013-06-05 | 2014-12-15 | 矢崎総業株式会社 | Contact unit of variable resistance type liquid level sensor |
| CN105675092A (en) * | 2016-03-04 | 2016-06-15 | 温州瓯云科技有限公司 | Miniature high-precision liquid level sensor |
| CN206818279U (en) * | 2017-04-13 | 2017-12-29 | 鸿准精密模具（昆山）有限公司 | Liquid level gauge |
| CN107478306A (en) * | 2017-10-10 | 2017-12-15 | 中国计量大学 | A kind of storage tank liquid-level meter field calibration device |
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