CN101509803B - Liquid level sensor - Google Patents
Liquid level sensor Download PDFInfo
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- CN101509803B CN101509803B CN2009100569685A CN200910056968A CN101509803B CN 101509803 B CN101509803 B CN 101509803B CN 2009100569685 A CN2009100569685 A CN 2009100569685A CN 200910056968 A CN200910056968 A CN 200910056968A CN 101509803 B CN101509803 B CN 101509803B
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- soft iron
- liquid level
- level sensor
- rotor
- hall device
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Abstract
The invention discloses a liquid level sensor and uses the Hall effect principle. A rotor firmly connected with a floater component winds back to a rotating shaft and rotates when the liquid level changes, thus causing the change of peripheral magnetic field. As the magnetic field applied on a Hall device changes, the change of an output signal is realized. The specific spatial layout of the rotor, stator soft iron and the Hall device forms a specific magnetic circuit, thus leading the rotation angle of the rotor to form linear relation with the intensity of the magnetic field and the intensity of the magnetic field to form linear relation with the output voltage of the Hall device. Consequently, the linearity between the rotation angle of the rotor and the voltage signal output of the whole liquid level sensor is realized. The liquid level sensor has long service life and the output signal can be directly used by a vehicle instrument.
Description
Technical field
The present invention relates to automotive electronic technology, particularly a kind of liquid level sensor.
Background technology
Present fuel oil for vehicles position transducer type is wire-wound resistor or thick-film resistor formula potentiometric pick-up, comprise that a resistive element and one rotate or sliding system is formed, by rotating or the sliding system change position of contact on resistive element, obtaining a resistance that becomes certain relation with the moving contact position, is the mechanism of contact.On the one hand, there is contact friction in this kind potentiometric pick-up in the course of work, be difficult for serviceable life increasing substantially; On the other hand, be subjected to the restriction of materials used, under complicated oil product, corrode easily, cause line broken circuit or signal quality instability; Moreover owing to be resistance output, signal can't directly be used by vehicular meter, need carry out extra circuit design and carry out conversion of signals.
Summary of the invention
The technical matters that the present invention will solve provides a kind of liquid level sensor, long service life, and the signal of output can directly be used by vehicular meter.
For solving the problems of the technologies described above, liquid level sensor of the present invention comprises rotor, stator, float assembly, side cover; Described rotor comprises single-revolution axle, soft iron one, soft iron two, one magnet, cylindrical plastic housing one, supports buckle, described magnetic catch is at soft iron together between the soft iron two, soft iron one, magnet, soft iron two common formation one right cylinders, described right cylinder axle center is provided with circular hole one, described swivel sleeve is in described circular hole one, end one, end two two ends lean out, the center section of soft iron one, soft iron two, magnet and revolving shaft is fixed in the described cylindrical plastic housing one, supports the end one that buckle is fixed on described revolving shaft; Described stator comprises the polylith soft iron, a hall device, plastic casing two, described polylith soft iron is formed an annulus, the internal diameter of described annulus is greater than the diameter of described cylindrical plastic housing one, described hall device is placed in one between slit between two blocks of soft irons, the polylith soft iron of described stator, a hall device is fixed in the plastic casing two, the one side of described plastic casing two and the coaxial cylindrical accommodation space that is provided with of described annulus, the another side of described plastic casing two and the coaxial circular hole two that is provided with of described annulus, described cylindrical accommodation space is with described cylindrical plastic housing one coupling, described circular hole two is with end two couplings of described revolving shaft, the end two of described revolving shaft is sleeved in the described circular hole two, described cylindrical plastic housing one is contained in the described cylindrical accommodation space, and the end one of described rotor revolving shaft is sleeved in the circular hole three that is arranged at described side cover; Rotor links by support card and connects float assembly.
Liquid level sensor of the present invention, according to the Hall effect principle, the rotor that firmly is connected with float assembly is under the situation that liquid level changes, the wraparound rotating shaft rotates, cause peripheral changes of magnetic field, the magnetic field that is applied on the hall device changes, thereby realizes the change of output signal.The particular space layout of rotor, stator soft iron, hall device has formed specific magnetic circuit, make that the corner and the magnetic field intensity of rotor are linear, the output voltage of magnetic field intensity and hall device is linear, and then realizes that the voltage signal of angle of rotor and whole liquid level sensor is output into linearity.
Liquid level sensor of the present invention owing to adopt contactless structure, can be worked under complicated, abominable operating modes such as oil product, and significantly improve serviceable life; Liquid level sensor of the present invention can directly be exported and be easy to the voltage signal accepted by instrument, also can be used other electron device, voltage signal is converted to output resistance, be beneficial to have now and directly use as the instrument that inserts signal with resistance, can provide various mode signal output to use according to the requirement of vehicle, simplify the corresponding treatment circuit of vehicular meter to the instrument receiving element.
Description of drawings
Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail.
Fig. 1 is liquid level sensor one an embodiment structural representation of the present invention;
Fig. 2 is the cross-sectional view of liquid level sensor one embodiment of the present invention;
Fig. 3 is the magnetic Circuit Design layout type synoptic diagram of liquid level sensor one embodiment of the present invention;
Fig. 4 is the cross-section structure partial schematic diagram of liquid level sensor one embodiment of the present invention.
Embodiment
Liquid level sensor one embodiment of the present invention comprises rotor 20, stator 30, float assembly 10, side cover 40 as shown in Figure 1 and Figure 2; Described rotor such as Fig. 2, shown in Figure 3, comprise that one supports buckle 26, single-revolution axle 24, bigger soft iron 1, less soft iron 2 23, magnet 22, cylindrical plastic housing one, described magnet 22 is clipped in described soft iron 1,2 23 of soft irons, soft iron 1, magnet 22, soft iron 2 23 common formation one right cylinders, the right cylinder axle center of described common formation is provided with circular hole one, described soft iron 1 surpasses vertically half of right cylinder of described common formation, described circular hole one is arranged in the soft iron 1, described revolving shaft 24 is enclosed within the described circular hole one, end one, hold two two ends to lean out, the soft iron 1 of described rotor, soft iron 2 23, the center section of magnet 22 and revolving shaft 24 is fixed in the described cylindrical plastic housing one by hermetically sealed mode injection moulding, supports the end one that buckle 26 is fixed on described revolving shaft 24; Described stator such as Fig. 3, shown in Figure 4, comprise three blocks of soft irons 31, a hall device 34, three metal inserts, two electric capacity 35, plastic casing two, described three blocks of soft irons 31 are formed an annulus, the internal diameter of this annulus is greater than the diameter of described cylindrical plastic housing one, described hall device 34 is placed in one between the slit of two blocks of soft irons 31, the face that forms described two blocks of soft irons in this slit can cover the workplace of described hall device, hall device 34, the pin of electric capacity 35 is welded on the metal insert, connect external circuit through lead, the described soft iron 31 of stator 30, a hall device 34, electric capacity 35, metal insert sealing injection moulding is fixed in the plastic casing two, the coaxial cylindrical accommodation space that is provided with of annulus that the one side of described plastic casing two and described three blocks of soft irons 31 are formed, the coaxial circular hole two that is provided with of annulus that the another side of described plastic casing two and described three blocks of soft irons 31 are formed, described cylindrical accommodation space is with described cylindrical plastic housing one coupling, described circular hole two is with end two couplings of described revolving shaft, the end two of described rotor 20 revolving shaftes 24 is sleeved in the described circular hole two, described cylindrical plastic housing one is contained in the described cylindrical accommodation space, and the end one of described rotor 20 revolving shaftes 24 is sleeved in the circular hole three that is arranged at described side cover 40; Rotor 20 connects float assembly 10 in succession by supporting buckle 26.
During use, stator, side cover are fixed on the car body, and rotor is fixed between stator and side cover by the revolving shaft pivot, and the support card of the float lever of float assembly by the rotor upside buckles and be solidly connected.During liquid level change, rotor is under the drive of the float lever swing of float assembly, and revolving shaft rotates, the hall element output voltage signal between the stator soft iron.
Liquid level sensor of the present invention, according to the Hall effect principle, the rotor that firmly is connected with float assembly is under the situation that liquid level changes, the wraparound rotating shaft rotates, cause peripheral changes of magnetic field, the magnetic field that is applied on the hall device changes, thereby realize the change of output signal, rotor, the stator soft iron, the particular space layout of hall device has formed specific magnetic circuit, make that the corner and the magnetic field intensity of rotor are linear, the output voltage of magnetic field intensity and hall device is linear, and then realizes that the voltage signal of angle of rotor and whole liquid level sensor is output into linearity.
Liquid level sensor of the present invention owing to adopt contactless structure, can be worked under complicated, abominable operating modes such as oil product, and significantly improve serviceable life; Liquid level sensor of the present invention can directly be exported and be easy to the voltage signal accepted by instrument, also can be used other electron device, voltage signal is converted to output resistance, be beneficial to have now and directly use as the instrument that inserts signal with resistance, can provide various mode signal output to use according to the requirement of vehicle, simplify the corresponding treatment circuit of vehicular meter to the instrument receiving element.
Claims (7)
1. a liquid level sensor is characterized in that, comprises rotor, stator, float assembly, side cover; Described rotor comprises single-revolution axle, soft iron one, soft iron two, one magnet, cylindrical plastic housing one, supports buckle, described magnetic catch is at soft iron together between the soft iron two, soft iron one, magnet, soft iron two common formation one right cylinders, described right cylinder axle center is provided with circular hole one, described swivel sleeve is in described circular hole one, end one, end two two ends lean out, the center section of soft iron one, soft iron two, magnet and revolving shaft is fixed in the described cylindrical plastic housing one, supports the end one that buckle is fixed on described revolving shaft; Described stator comprises the polylith soft iron, a hall device, plastic casing two, described polylith soft iron is formed an annulus, the internal diameter of described annulus is greater than the diameter of described cylindrical plastic housing one, described hall device is placed in one between slit between two blocks of soft irons, the polylith soft iron of described stator, a hall device is fixed in the plastic casing two, the one side of described plastic casing two and the coaxial cylindrical accommodation space that is provided with of described annulus, the another side of described plastic casing two and the coaxial circular hole two that is provided with of described annulus, described cylindrical accommodation space is with described cylindrical plastic housing one coupling, described circular hole two is with end two couplings of described revolving shaft, the end two of described revolving shaft is sleeved in the described circular hole two, described cylindrical plastic housing one is contained in the described cylindrical accommodation space, and the end one of described rotor revolving shaft is sleeved in the circular hole three that is arranged at described side cover; Rotor links by support card and connects float assembly.
2. liquid level sensor according to claim 1 is characterized in that, described stator comprises three blocks of soft irons, and described three blocks of soft irons are formed an annulus.
3. liquid level sensor according to claim 1 is characterized in that, described hall device places between slit between two blocks of soft irons of stator, and the face that forms described two blocks of soft irons in this slit can cover the workplace of described hall device.
4. liquid level sensor according to claim 1 is characterized in that, the center section injection moulding of described soft iron one, soft iron two, magnet and revolving shaft is fixed in the described cylindrical plastic housing one.
5. liquid level sensor according to claim 1 is characterized in that, the polylith soft iron of described stator, a hall device injection moulding are fixed in the plastic casing two.
6. liquid level sensor according to claim 1 is characterized in that described stator also comprises sheet metal, and hall device connects external circuit by sheet metal.
7. liquid level sensor according to claim 1 is characterized in that, described soft iron one surpasses vertically half of described right cylinder, and described circular hole one is arranged in the soft iron one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100569685A CN101509803B (en) | 2009-03-20 | 2009-03-20 | Liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100569685A CN101509803B (en) | 2009-03-20 | 2009-03-20 | Liquid level sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101509803A CN101509803A (en) | 2009-08-19 |
| CN101509803B true CN101509803B (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100569685A Active CN101509803B (en) | 2009-03-20 | 2009-03-20 | Liquid level sensor |
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| CN (1) | CN101509803B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278216A (en) * | 2013-05-31 | 2013-09-04 | 江苏多维科技有限公司 | Liquid level sensor system |
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| CN101509803A (en) | 2009-08-19 |
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