CN203551045U - Liquid level sensor - Google Patents
Liquid level sensor Download PDFInfo
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- CN203551045U CN203551045U CN201320633402.6U CN201320633402U CN203551045U CN 203551045 U CN203551045 U CN 203551045U CN 201320633402 U CN201320633402 U CN 201320633402U CN 203551045 U CN203551045 U CN 203551045U
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Abstract
The utility model discloses a liquid level sensor, which comprises a shell, a controller, a stepping motor, a detection disk, a shaft frame, a floater and a rotary disk, wherein a photoelectric sensor is fixed inside the shell; the controller is used for driving an output shaft of the stepping motor to generate angular displacement and calculating a liquid level; the stepping motor is provided with the output shaft; the detection disk rotates along with the output shaft of the motor; a blocking sheet and detection elements are fixed to the detection disk; the detection elements refer to two Hall sensors of the same specifications; a floater shaft is rotationally fixed to the shaft frame; a first gear is fixed to the floater shaft; the floater floats on the surface of tested liquid, and is fixed to the floater shaft through a floater rod; the rotary disk and the motor output shaft are coaxial; a second gear meshed with the first gear is arranged on the rotary disk; a positioning magnet is further fixed. The utility model further discloses a measuring method of the liquid level sensor. The liquid level sensor has the advantages of high measuring accuracy, insensitivity to the change of environmental temperature, and the like.
Description
Technical field
The application relates to a kind of liquid level sensor, can be used for measuring the liquid level of various liquid.
Background technology
At liquid level detection field, there are a variety of measurement means.Adopt at present many liquid level sensors to comprise variable resistance type, dry-reed, magnetostriction type etc.
Variable resistance type liquid level sensor is that a float is placed in liquid and makes it swim in all the time liquid surface, and this float is also connecting the sliding end of slide rheostat.Float is along with liquid level raises together or reduces, and the sliding end of the slide rheostat being connected with float is motion thereupon also, thereby just can learn height of liquid level by the resistance that detects slide rheostat.
Variable resistance type liquid level sensor has following shortcoming:
One, the possibility that exists slide rheostat to contact with fluid to be measured.If fluid to be measured has certain electric conductivity, can affect liquid level sensor measuring accuracy, even make liquid level sensor lose efficacy.
Its two, the sliding end of slide rheostat is after long-term use, can there is variation to a certain degree in its contact resistance, thereby affect measuring accuracy.
Its three, resistance and the temperature of slide rheostat are closely related, change, thereby affect measuring accuracy even if liquid level does not change because temperature variation also can cause the resistance of slide rheostat.
Dry-reed liquid level sensor is that a float with magnet is placed in liquid and makes it swim in all the time liquid surface, is also provided with multiple tongue tubes (Reed Switch also claims reed capsule, magnetic reed switch) that are positioned on differing heights.Float is along with liquid level raises together or reduces, and the magnet on float can make to be positioned at the tongue tube adhesive of corresponding height, and the tongue tube on all the other height all flicks.Only need all tongue tube contact resistances, then by measured resistance value, can learn which tongue tube closure, thereby learn height of liquid level.
Dry-reed liquid level sensor has been realized the isolation of measuring sensor and fluid to be measured, i.e. non-contact measurement liquid level, thereby there is not short-circuit risks.If but dry-reed liquid level sensor arranges sparsely by tongue tube, can cause measuring accuracy deficiency; If tongue tube is arranged intensively, the magnet on float will make near the multiple tongue tube adhesives of certain height simultaneously so, can cause equally measuring accuracy limited.
Structure and working principle of magnetostrictive liquid level sensor such as "Instrument Technique and Sensor" Journal 2007 Section 12 article "magnetostrictive liquid level sensor", "Mining" Journal December 2004 Volume 13 4 article "magnetostrictive liquid level sensor applications and development", said.It has, and non-contact measurement liquid level, precision are high, the feature of stable performance.But have the blind area that cannot detect, and manufacturing process complexity, cost are higher.
Summary of the invention
The application's technical matters to be solved is to provide a kind of novel high-accuracy liquid level sensor, adopts measuring sensor to measure the liquid level of fluid to be measured contactlessly.
For solving the problems of the technologies described above, the application's liquid level sensor comprises:
---housing, its inside crosses an airtight cavity, in this airtight cavity, is fixed with photoelectric sensor, and this photoelectric sensor is comprised of optical transmitting set and optical receiver two parts;
---controller, be positioned at described airtight cavity, the output shaft of Driving Stepping Motor produces angular displacement, and calculates liquid level;
---stepper motor, be positioned at described airtight cavity, there is an output shaft; The output pulse of often receiving controller, motor output shaft just rotates fixed angle;
---detection dish, be positioned at described airtight cavity, be fixed on motor output shaft, and follow motor output shaft and rotate together; On detection dish, be fixed with catch and detecting element, detecting element is the Hall element of two same specifications, is fixed on mutually near and has the position of same distance with the center of circle of detection dish;
---pedestal, be fixed on outside, on pedestal, be fixed with rotationally float fulcrum pin, on float fulcrum pin, be fixed with un-rotatably the first gear;
---float, swims in the surface of fluid to be measured; Float is fixed on float fulcrum pin by float lever;
---rotary disk, be rotatably mounted to outside, rotary disk has identical axial line with motor output shaft; At rotary disk, be provided with the second gear being meshed with the first gear, be also fixed with phase magnet; The distance in the center of circle of phase magnet center and rotary disk equals the distance in the center of circle of detecting element center and detection dish.
Further, when detecting element is the line style Hall element of two same specifications, it detects that the position of identical magnetic induction density is exactly the position of aiming at phase magnet;
When detecting element is the Hall switch sensor of two same specifications, the position that its level state all changes is exactly the position of aiming at phase magnet.
Further, when detection dish turns to special angle, catch is between optical transmitting set and optical receiver.
Further, be also provided with spring on rotary disk, spring is arranged between rotary disk and housing, and the second gear of rotary disk opposite side and the first gear are compressed also intermeshing.
The application's liquid level sensor tool has the following advantages:
One, inclusion test element all can be arranged in the cavity of watertight at interior electric component, realizes the contactless level gauging to fluid to be measured, thereby can be applied to level gauging inflammable, explosive and highly corrosive liquid.
Its two, detecting element is comprised of two Hall elements of same specification, only has the output valve of these two Hall elements identical (line style) or all change level state (switching mode) and just think and aimed at float magnet.Hall element by two same specifications can be realized high-precision level gauging to the detection of same magnet, and can compensation temperature etc. the impact of change of external conditions.
Its three, compared with Liquid Level Sensor Based on Magnetostriction, the application's liquid level detects except having similar high precision, has the non-blind area, little, the easy installation of volume of detection, the feature such as with low cost simultaneously.
Its four, compact to design, stable performance, can work reliably and with long-term.
Accompanying drawing explanation
Fig. 1 is the structural representation of the application's liquid level sensor;
Fig. 2 is the float position variable condition schematic diagram of observing along the arrow A direction in Fig. 1;
Fig. 3 is the process flow diagram of the measuring method of the application's liquid level sensor;
Fig. 4 is the process flow diagram of a specific embodiment of the measuring method of the application's liquid level sensor.
Description of reference numerals in figure:
1 is housing; 10 is dividing plate; 11 is the first cavity; 12 is the second cavity; 13 is photoelectric sensor; 2 is controller; 3 is stepper motor; 30 is motor output shaft; 4 is detection dish; 41 is catch; 42 is detecting element; 5 is pedestal; 50 is float fulcrum pin; 51 is the first gear; 6 is float; 60 is float lever; 7 is rotary disk; 71 is spring; 72 is the second gear; 73 is phase magnet; 8 is photoelectric encoder (optional).
Embodiment
Refer to Fig. 1 and Fig. 2, the application's liquid level sensor comprises:
---housing 1, its inside has crossed an airtight cavity.In this airtight cavity inside, by dividing plate 10 Further Divisions, be the first cavity 11 and the second cavity 12 again.On dividing plate 10, be fixed with photoelectric sensor 13, this photoelectric sensor 13 is comprised of optical transmitting set and optical receiver two parts.
---controller 2 is for example single-chip microcomputer, PLC(programmable logic controller (PLC)) etc., be arranged in the first cavity 11.To stepper motor 3, export pulse produces angular displacement with the output shaft 30 of control step motor 3 to this controller 2 on the one hand, calculates on the other hand the liquid level of fluid to be measured according to the angular displacement of the output shaft 3 of stepper motor 3.
---stepper motor 3, is arranged in the first cavity 11.It has an output shaft 30 and passes through dividing plate 10.An output pulse of often receiving controller 2, the output shaft 30 of stepper motor 3 just produces fixing angular displacement (rotating fixing angle).Output pulse is divided into and rotates and reverse two types, and when controller 2 is exported forward pulse, motor output shaft 30 rotates along a direction, for example clockwise direction; When controller 2 is exported inversion pulse, motor output shaft 30 rotates along another direction, for example counterclockwise.During practical application, the segmentation step number that only need to increase stepper motor 3 can improve accuracy of detection effectively.
---detection dish 4, is arranged in the second cavity 12.It is fixed on motor output shaft 30, and follows motor output shaft 30 and rotate together.On detection dish 4, be fixed with catch 41 and detecting element 42.When detection dish 4 turns to special angle, catch 41 can be between optical transmitting set and optical receiver, and now photoelectric sensor 13 can detect catch 41.Detecting element 42 is Hall elements of two same specifications, is close on the circumference that is fixed on detection dish 4, and the center of circle of these two Hall elements and detection dish 4 has same distance.
---pedestal 5, is fixed on the outside of housing 1.On pedestal 5, be fixed with rotationally float fulcrum pin 50, on float fulcrum pin 50, be fixed with un-rotatably the first gear 51.The first gear 51 is followed float fulcrum pin 50 and is rotated together, but there is no relative motion between the first gear 51 and float fulcrum pin 50.
---float 6, swims in the surface of fluid to be measured.Float 6 is fixed on float fulcrum pin 50 by the fixing float lever 60 of length.When the liquid level of fluid to be measured changes, float lever 60 rotates drive float fulcrum pin 50, the first gear 51 together with respect to pedestal 5.
---rotary disk 7, is rotatably mounted to the outside of housing 1.The axle center of rotary disk 7 is on the axes extending line of motor output shaft 30, and rotary disk 7 has identical axial line with motor output shaft 30 in other words.On rotary disk 7, be axially provided with spring 71 and the second gear 72.Spring 71 is arranged between rotary disk 7 and housing 1, for the second gear 72 and the first gear 51 that make rotary disk 7 opposite sides, compresses also intermeshing.On rotary disk 7, be also fixed with phase magnet 73.Phase magnet 73 is fixed on the circumference of rotary disk 7, and the distance in the center of circle of phase magnet 73 centers and rotary disk 7 equals the distance in the center of circle of detecting element 42 centers and detection dish 4.
Hall element is a kind of element of measuring magnetic induction density, is divided into two kinds of line style and switching modes.In its sensing range, line style Hall element is nearer apart from magnet, and the magnetic induction density measuring is larger; Vice versa.Hall switch sensor is exported a kind of level state (for example high level) at ordinary times, only in the region nearer apart from magnet, just switches to the another kind of level state of output (for example low level).
In the application, photoelectric sensor 13 and catch 41 have formed a zero position device.When catch 41 is not between the optical transmitting set of photoelectric sensor 13 and optical receiver, the optical receiver of photoelectric sensor 13 can receive the signal of optical transmitting set.When catch 41 is between the optical transmitting set of photoelectric sensor 13 and optical receiver, the optical receiver of photoelectric sensor 13 cannot receive the signal of optical transmitting set.Based on this feature, can be used for carrying out position correction.
In the application, detecting element 42 is Hall elements of two same specifications.When it is the line style Hall element of two same specifications, these two Hall elements detect that the position of identical magnetic induction density is exactly the position of aiming at phase magnet 73.When it is the Hall switch sensor of two same specifications, the position that level state of these two Hall elements all changes is exactly the position of aiming at phase magnet 73.
The measuring principle of the application's liquid level sensor is: along with the liquid level of fluid to be measured raises or reduces, the position of float 6 also increases or reduces, and this rotates float lever 60 together with float fulcrum pin 50 with respect to pedestal 5.Driven the first gear 51 being fixed on float fulcrum pin 50 to rotate simultaneously.Due to the meshing relation between the second gear 72 and the first gear 51, drive again the second gear 72 to rotate simultaneously, make rotary disk 7 rotate.Obviously, when the liquid level of fluid to be measured raises, rotary disk 7 will rotate along a direction, for example clockwise direction; When the liquid level of fluid to be measured reduces, rotary disk 7 will rotate along another direction, for example counterclockwise.Controller 2 is by the rotation of the output shaft 30 of control step motor 3, in the time of can making detecting element 42 on detection dish 4 aim at the phase magnet 73 on rotary disk 7, now the angular displacement of motor output shaft 30 is just equal to the angular displacement of rotary disk 7, can learn the liquid level of fluid to be measured by converting.
Refer to Fig. 3, the measuring method of the application's liquid level sensor comprises the steps:
The 1st step, controller 2 Driving Stepping Motors 3 are worked, and motor output shaft 30 drives detection dish 4 to rotate together, until the catch 41 on detection dish 4 has stopped the signal of photoelectric sensor 13, this is called as calibration steps, and the signal that now photoelectric sensor 13 is exported is called as zero signal.Calibration steps only need to carry out once at every turn after powering on.
Obviously, the installation site of catch 41 should be corresponding with the installation site of photoelectric sensor 13, to guarantee that when detection dish 4 turns to special angle catch 41 can fully intercept optical transmitting set and the optical receiver of photoelectric sensor switch 13.
The 2nd step, controller 2 Driving Stepping Motors 3 are worked, and motor output shaft 30 drives detection dish 4 to rotate together, until the detecting element 42 on detection dish 4 is aimed at the phase magnet 73 on rotary disk 7, this is called as measuring process.Because detecting element 42 is comprised of the Hall element of two same specifications, therefore only has phase magnet 73 simultaneously in the sensing range of these two Hall elements and when identical with the distance of these two Hall elements, these two Hall elements just can have identical output (if line style) or all change to identical level state (if switching mode).Therefore the detecting element 42 consisting of two Hall elements has just had very high accuracy of detection.When the external conditions such as temperature, voltage change, the impact of its Hall element on these two same specifications is consistent, still can not affect the accuracy of detection of detecting element 42 after cancelling out each other.
Because detection dish 4 and rotary disk 7 have same axial line, the distance in the center of circle of detecting element 42 and detection dish 4 equals the distance in the center of circle of phase magnet 73 and rotary disk 7, therefore can guarantee that detecting element 42 is at a certain position alignment phase magnet 73.
The 3rd step, controller 2 is according to motor output shaft 30(or detection dish 4) angular displacement between from calibration steps to measuring process or from last measuring process to the angular displacement this measuring process, calculate the height of liquid level of fluid to be measured, this can draw by trigonometric function formula.
The number of pulses of exporting to stepper motor 3 due to controller 2 is mutually corresponding with the angular displacement of the output shaft 30 of stepper motor 3, and the pulse pattern (forward pulse, inversion pulse) that controller 2 also can be exported to stepper motor 3 according to it and number of pulses calculate the liquid level of fluid to be measured.
If carrying out carrying out again measuring process for the second time after measuring process for the first time, controller 2 is according to motor output shaft 30(or detection dish 4 so) from measuring process for the first time to the angular displacement measuring process for the second time or according to controller 2, from measuring process for the first time, to the pulse pattern of exporting to stepper motor 3 measuring process for the second time and number of pulses, can calculate the height of liquid level of fluid to be measured.
Or, also can adopt sensor (photoelectric encoder 8 as shown in phantom in Figure 1) directly to measure detection dish 4(or motor output shaft 30) angular displacement and pass to controller 2.
Refer to Fig. 4, this is a specific embodiment of the measuring method of the application's liquid level sensor, and its middle controller 2 is every exports a pulse signal to stepper motor 3, and motor output shaft 30 just rotates fixed angle.For example, forward pulse, inversion pulse correspond respectively to motor output shaft 30 clockwise, rotate counterclockwise.First, controller 2 Driving Stepping Motors 3 are worked, for example, export all the time the pulse signal of same type, until photoelectric sensor 13 is exported zero signal.Secondly, controller 2 is exported the pulse signal of a type to stepper motor 3, until two Hall elements of detecting element 42 have output.Controller 2 is further adjusted type, the quantity of output pulse, until two Hall elements of detecting element 42 have identical output.Finally, controller 2, according to type and the quantity of all output pulses in measuring process, calculates the height of liquid level of fluid to be measured.
These are only the application's preferred embodiment, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the application's protection domain.
Claims (4)
1. a liquid level sensor, is characterized in that, comprising:
---housing, its inside crosses an airtight cavity, in this airtight cavity, is fixed with photoelectric sensor, and this photoelectric sensor is comprised of optical transmitting set and optical receiver two parts;
---controller, be positioned at described airtight cavity, the output shaft of Driving Stepping Motor produces angular displacement, and calculates liquid level;
---stepper motor, be positioned at described airtight cavity, there is an output shaft; The output pulse of often receiving controller, motor output shaft just rotates fixed angle;
---detection dish, be positioned at described airtight cavity, be fixed on motor output shaft, and follow motor output shaft and rotate together; On detection dish, be fixed with catch and detecting element, detecting element is the Hall element of two same specifications, is fixed on mutually near and has the position of same distance with the center of circle of detection dish;
---pedestal, be fixed on outside, on pedestal, be fixed with rotationally float fulcrum pin, on float fulcrum pin, be fixed with un-rotatably the first gear;
---float, swims in the surface of fluid to be measured; Float is fixed on float fulcrum pin by float lever;
---rotary disk, be rotatably mounted to outside, rotary disk has identical axial line with motor output shaft; At rotary disk, be provided with the second gear being meshed with the first gear, be also fixed with phase magnet; The distance in the center of circle of phase magnet center and rotary disk equals the distance in the center of circle of detecting element center and detection dish.
2. liquid level sensor according to claim 1, is characterized in that, when detecting element is the line style Hall element of two same specifications, it detects that the position of identical magnetic induction density is exactly the position of aiming at phase magnet;
When detecting element is the Hall switch sensor of two same specifications, the position that its level state all changes is exactly the position of aiming at phase magnet.
3. liquid level sensor according to claim 1, is characterized in that, when detection dish turns to special angle, catch is between optical transmitting set and optical receiver.
4. liquid level sensor according to claim 1, is characterized in that, is also provided with spring on rotary disk, and spring is arranged between rotary disk and housing, and the second gear of rotary disk opposite side and the first gear are compressed also intermeshing.
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| CN201320633402.6U CN203551045U (en) | 2013-10-14 | 2013-10-14 | Liquid level sensor |
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| CN201320633402.6U CN203551045U (en) | 2013-10-14 | 2013-10-14 | Liquid level sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512638A (en) * | 2013-10-14 | 2014-01-15 | 张维国 | Liquid level sensor and measuring method thereof |
| CN105588252A (en) * | 2014-10-20 | 2016-05-18 | 中国建筑科学研究院 | Active pyroelectric infrared intelligent switch |
| CN105973328A (en) * | 2016-03-30 | 2016-09-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Straight channel surface runoff test facility and application method thereof |
| CN108693368A (en) * | 2017-04-12 | 2018-10-23 | 王万勤 | A kind of computational methods of titrimetry sampling device and its sample size |
-
2013
- 2013-10-14 CN CN201320633402.6U patent/CN203551045U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512638A (en) * | 2013-10-14 | 2014-01-15 | 张维国 | Liquid level sensor and measuring method thereof |
| CN103512638B (en) * | 2013-10-14 | 2016-05-11 | 张维国 | Liquid level sensor and measuring method thereof |
| CN105588252A (en) * | 2014-10-20 | 2016-05-18 | 中国建筑科学研究院 | Active pyroelectric infrared intelligent switch |
| CN105588252B (en) * | 2014-10-20 | 2018-09-28 | 中国建筑科学研究院 | Active pyroelectric infrared intelligent switch |
| CN105973328A (en) * | 2016-03-30 | 2016-09-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Straight channel surface runoff test facility and application method thereof |
| CN108693368A (en) * | 2017-04-12 | 2018-10-23 | 王万勤 | A kind of computational methods of titrimetry sampling device and its sample size |
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Effective date of registration: 20190311 Address after: Room A63, 031 Building 1076 Military Industrial Road, Yangpu District, Shanghai, 2003 Patentee after: Shanghai Yasheng Electronic Technology Co.,Ltd. Address before: 201700 No. 69 Huafang Road, Qingpu District, Shanghai Patentee before: Zhang Weiguo |
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Granted publication date: 20140416 |