CN104776881A - Liquid level density sensor provided with magnetic floating balls - Google Patents
Liquid level density sensor provided with magnetic floating balls Download PDFInfo
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- CN104776881A CN104776881A CN201410016359.8A CN201410016359A CN104776881A CN 104776881 A CN104776881 A CN 104776881A CN 201410016359 A CN201410016359 A CN 201410016359A CN 104776881 A CN104776881 A CN 104776881A
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Abstract
The invention discloses a liquid level density sensor provided with magnetic floating balls. An actuation rod is sleeved with a first floating ball and a second floating ball different in specific gravity; the second floating ball is coated with a housing of the first floating ball in a coverage manner; a through hole is formed in the housing of the first floating ball; when the actuation rod extends into a container, liquid in the container flows into the housing of the first floating ball through the through hole, so that both the first floating ball and the second floating ball can float on the surface of the liquid in the container; the distances from two magnetic elements of the first and second floating balls to the liquid surface are different, so that the distance change forms a linear relation with the measured liquid density only; the sensor is arranged on the actuation rod, so that the accuracy of the liquid measured at present can be quickly and correctly calculated according to the linear relation when the liquid density is calculated by a pulse signal receiving and transmitting time difference.
Description
Technical field
The present invention is relevant a kind of liquid level density sensor, espespecially a kind of liquid level density sensor of tool magnetic ball float.
Background technology
The general measurement often carrying out liquid level or density in highly pressurised liquid opertaing device or accumulator tank with the liquid level density sensor of tool magnetic ball float, refer to shown in Fig. 8, be the liquid level density sensor of existing tool magnetic ball float, it comprises:
One operating bar 60, it comprises a hollow tube and a line of induction 61; Wherein this line of induction 61 wears and is fixed in this hollow tube;
One sensing apparatus 50, is arranged at one end of the hollow tube of this operating bar 60, and includes the controller 51 of a tool calculation function, and this controller is electrically connected with this line of induction 61;
One first ball float 70, includes shell 71, buoyancy aid 72,1 first magnetic element 73 and one second magnetic element 74; Wherein this shell 71 has a perforation 711 and to be sheathed on this operating bar 60 for this this first ball float 70 and can to move axially along this operating bar 60; This buoyancy aid 72 is arranged at this shell 71 close to this sensor 50 one end, makes this first ball float 70 float on liquid level close to this sensor 50 one end; This first magnetic element 73 is arranged at this buoyancy aid 72 one end contiguous in this shell 71; This second magnetic element 74 is arranged in this shell 71 away from this buoyancy aid 72 one end; And
One second ball float 80, has through hole 81 and one the 3rd magnetic element 82 in the shell 71 being arranged at this first ball float 70; This through hole 81 is sheathed on this operating bar 60 for this second ball float 80, and also can move axially along this operating bar 60 between first magnetic element 73 and the second magnetic element 74 of this first ball float 70; Again, the two poles of the earth of 3rd magnetic element 82 are respectively towards this first magnetic element 73 and the second magnetic element 74, and the two poles of the earth of the 3rd magnetic element 82 are respectively with this first magnetic element 73 and the second magnetic element 74 mutual exclusion, and to prevent this second ball float 80 can be adsorbed in because of magnetic force in movement, one end that this first ball float 70 has magnetic element affects measurement result.
The liquid level density sensor of existing tool magnetic ball float in use, this operating bar 60 is inserted in testing liquid away from one end of this sensor 50, and make this sensor 50 expose liquid level, now, this first ball float 70 can float on this testing liquid liquid level because of this buoyancy aid 72 close to this sensor 50 one end, and the first magnetic element 73 of this first ball float 70 is close with liquid level because of this buoyancy aid 72 contiguous, therefore when the controller 51 of this sensor 50 exports a pulse signal by this line of induction 61, this pulse signal is through the position of this first magnetic element 73, influence of magnetic field can be subject to and export a magnetic effect signal, this controller then can go out the position of this first magnetic element 73 on this operating bar 60 according to sending pulse signal to the time reckoning receiving this magnetic effect signal, and calculate this testing liquid height further, again, because of the perforation 711 on the shell 71 of this first ball float 70, this testing liquid can flow in this shell 71, this second ball float 80 can because of buoyancy, dynamic balance between first magnetic element 73 of gravity and the 3rd magnetic element 82 and this first ball float 70 and the magnetic force of the second magnetic element 74, and position is between this first magnetic element 73 and the second magnetic element 74, this controller 51 obtains this first magnetic element 73 by above-mentioned means respectively with the line of induction 61, second magnetic element 74 and the position of the 3rd magnetic element 82 on this operating bar 60, and the distance extrapolated between the 3rd magnetic element 82 and this first magnetic element 73 and the second magnetic element 74, this controller 51 calculates the density of this testing liquid according to this distance.
Please also refer to Fig. 9, its longitudinal axis is the density (unit is thousand grams/cc) of testing liquid, its transverse axis is the distance (unit is inch) between the 3rd magnetic element 82 and this first magnetic element 73 and the second magnetic element 74, can learn when testing liquid density improves by observing, this second ball float 80 more can have buoyancy aid 72 one end close to this first ball float 70 because buoyancy improves, simultaneously the 3rd magnetic element 82 of this second ball float 80 also can more close to the first magnetic element 73 of this first ball float 70 away from the second magnetic element 74, it is then contrary when testing liquid density reduces, the controller 51 of this sensor 50 calculates the density of testing liquid according to upper two family curves of figure, but in practical operation because of the 3rd magnetic element 82 and this first magnetic element 73 and this second magnetic element 74 mutex relation and cause these two articles of family curves for being nonlinear curve respectively, unless accurate testing liquid density just being calculated with complicated calculations formula, otherwise easily occurs error and make result of calculation out of true.
Summary of the invention
Because the defect of liquid level density sensor of existing tool magnetic ball float, thus fundamental purpose of the present invention be to provide a kind of can simple computation fluid density and be compatible to the liquid level density sensor of the tool magnetic ball float of heterogeneous interface liquid.
Make the liquid level density sensor of tool magnetic ball float include for reaching aforementioned object major technique hand used in the present invention:
One operating bar, it comprises a hollow tube and a line of induction; Wherein this line of induction wears and is fixed in this hollow tube;
One sensor, is arranged at one end of the hollow tube of this operating bar, and includes the control circuit of a tool calculation function, and this control circuit is electrically connected with this line of induction;
At least one first ball float, it includes:
One shell, it has two the first relative perforation and at least one through holes; These 2 first relative perforation are inserted in wherein for this operating bar, this casing is located on this operating bar and also can moves axially along this operating bar; This through hole runs through and is formed on this shell, for making testing liquid flow into this shell;
One first magnetic element; Be fixed on vertical with this operating bar in this shell and away from the one side of this sensor;
One second ball float; To be arranged in this shell and there are two the second relative perforation and one second magnetic elements; Two relative second perforation are inserted in wherein for this operating bar, this second ball float is sheathed on this operating bar and can moves axially along this operating bar; This second magnetic element is fixed on this second ball float first magnetic element one end away from this first ball float; Again, the proportion of this second ball float is less than this first ball float; And
Range difference wherein between this first magnetic element and the second magnetic element and the density linearly linear relationship of this testing liquid, therefore this control circuit the first magnetic element of calculating this first ball float is to should the position of the line of induction, with to should second magnetic element of the second ball float of the first ball float to should behind the position of the line of induction, namely with the range difference between the first magnetic element and the second magnetic element, this straight linear relation is contrasted to calculate the density of this testing liquid.
User is when using the liquid level density sensor of tool magnetic ball float of the present invention, first operating bar is stretched in container, liquid in container can flow in the first ball float shell by through hole, so first and second ball float all can float in this vessel level, and two magnetic element positions of this first and second ball float and liquid level are just in different distance, therefore this distance change and measured fluid density linearly linear relationship; When making sensor on this operating bar calculate fluid density, can fast and correctly calculate the degree of accuracy measuring liquid at present according to straight linear relation.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the side cutaway view of the first preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 2 is the stereo appearance figure of the first preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 3 is the circuit block diagram of the control circuit of the first preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 4 A is the using state side cutaway view of the first preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 4 B is another using state side cutaway view of the first preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 5 is the signal output map of the liquid level density sensor of corresponding diagram 4A and Fig. 4 B.
Fig. 6 is the performance diagram of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 7 A is the using state side cutaway view of the second preferred embodiment of the liquid level density sensor of tool magnetic ball float of the present invention.
Fig. 7 B to 7D is the signal output map of the liquid level density sensor of corresponding diagram 7A.
Fig. 8 is the side cutaway view of the first ball float of the liquid level density sensor of existing tool magnetic ball float.
Fig. 9 is the performance diagram of the first ball float of the liquid level density sensor of existing tool magnetic ball float.
Drawing reference numeral illustrates:
10 sensor 11 control circuits
12 internal circuit 121 signal receiving modules
122 signal contrast module 123 signal compensation modules
124 signal output module 13 external circuits
131 transistor 132 pulsed discharge modules
133 coil 134 amplifiers
135 signal comparator 20 operating bars
21 line of induction 30 first ball floats
31 shells 311 first are bored a hole
312 through hole 32 first magnetic elements
33 second ball floats 331 second are bored a hole
332 second magnetic element 40 temperature sensing circuits
41 temperature-sensitive sticker 42 cold spot compensators
43 multiplier 44 analog-digital converters
50 sensor 51 controllers
60 operating bar 61 lines of induction
70 first ball float 71 shells
711 perforation 72 buoyancy aids
73 first magnetic element 74 second magnetic elements
80 second ball float 81 through holes
82 the 3rd magnetic elements
Embodiment
Below coordinating preferred embodiment graphic and of the present invention, setting forth the technological means that the present invention takes for reaching predetermined goal of the invention further.
Refer to shown in Fig. 1 and Fig. 2, the first embodiment of the liquid level density sensor of tool magnetic ball float of the present invention includes sensor 10, operating bar 20 and one first ball float 30.
This sensor 10 has a control circuit 11, this control circuit 11 tool calculation function.
This operating bar 20 is a hollow tube and one end is connected with this sensor 10, and this operating bar 20 has a line of induction 21, and this line of induction 21 to be arranged in this operating bar 20 and to be electrically connected with the control circuit 11 of this sensor 10.
This first ball float 30 has shell 31,1 first magnetic element 32 and one second ball float 33; This shell 31 has two the first relative perforation 311 and two through holes 312; These 2 first relative perforation 311 are inserted in wherein for this operating bar 20, this shell 31 is sheathed on this operating bar 20 and also can moves axially along this operating bar 20; This through hole 312 hole formed therethrough flows into this shell 31 in this shell 31 for testing liquid; This first magnetic element 32 is arranged in this shell 31 away from this sensor 10 one end; This second ball float 33 to be arranged in this shell 31 and to have two the second relative perforation 331 and one second magnetic elements 332; This two relative second perforation 331 is inserted in wherein for these operating bars 20, this second ball float 33 is sheathed on this operating bar 20 and can moves axially along this operating bar 20; This second magnetic element 332 is arranged at the first magnetic element 32 one end magnetic element of this second ball float 33 away from this first ball float 30; Wherein the proportion of this second ball float 33 is less than the proportion of this first ball float 30; The material of this second ball float 33 is expanded material; This first and second magnetic element 32,332 includes the chemical elements such as Ni, Co or Fe; The shape of this first and second magnetic element 32,332 is that annular, cylindricality, cube or irregular shape are appointed.
Refer to shown in Fig. 3, the control circuit 11 of this sensor 10 has internal circuit 12 and an external circuit 13.
This internal circuit 12 to be electrically connected with the line of induction 21 of this sensor 20 by this external circuit 13 and to include signal receiving module 121, signal contrast module 122 and a signal output module 124; This signal receiving module 121 is in order to obtain magnetic effect signal by this external circuit 13; This signal contrast module 122 calculates height and the density of this testing liquid according to this magnetic effect signal, and when measuring, this signal output module 124 exports an initial tactile signal to this external circuit.
This external circuit 13 is electrically connected with the line of induction 21 of this internal circuit 12 and this operating bar 20 and has transistor 131, pulsed discharge module 132, coil 133, amplifier 134 and a signal comparator 135, signal output module 124 and this pulsed discharge module 132 of this transistor 131 and this internal circuit 12 are electrically connected, and use as a switch and drive this pulsed discharge module 132 to export a pulse signal to this line of induction 21 according to above-mentioned initial tactile signal, when this pulse signal this through this line of induction 21 to should the second magnetic element 332 of the first magnetic element 32 of the first ball float 30 and the second ball float 33 time, this line of induction 21 can change generation vibration because of magnetic field and magnetic field vector changes and exports one first magnetic effect signal and the second magnetic effect signal respectively in this first magnetic element 32 and the second position of magnetic element 332 on operating bar 20, wherein the transmission speed of this first and second magnetic effect signal on this line of induction 21 is identical, this coil 133 is arranged at this line of induction 21 and is electrically connected to receive this first and second magnetic effect signal away from one end of this sensor 20 and with this line of induction 21, this amplifier 134 is electrically connected to obtain with this coil 133 and amplifies this two magnetic effects signal, this signal comparator 135 be electrically connected with this amplifier 134 to obtain this two amplified after magnetic effect signal convert digital signal to by simulating signal after export this internal circuit 12 to, wherein this transistor 131 can be a metal oxide semiconductcor field effect transistor.
Refer to shown in Fig. 4 A and Fig. 4 B, Fig. 5 and Fig. 6, wherein this Fig. 4 A is to should C part in part A to Fig. 5 in Fig. 5, in Fig. 5, the longitudinal axis of part A represents this pulse signal, in Fig. 5, the longitudinal axis of part B represents this second magnetic effect signal, in Fig. 5, the longitudinal axis of C part represents this first magnetic effect signal, and transverse axis t is then all the time, wherein in Fig. 4 B corresponding diagram 5 D part to F part in Fig. 5, in Fig. 5, the longitudinal axis of D part represents this pulse signal, in Fig. 5, the longitudinal axis of E part represents this second magnetic effect signal, and in Fig. 5, the longitudinal axis of F part represents this first magnetic effect signal, and transverse axis t is then all the time, the longitudinal axis of Fig. 6 represents density, and it is poor that transverse axis then represents first and second magnetic effect signal output time, user is when using the liquid level density sensor of tool magnetic ball float of the present invention, first this operating bar 20 to be inserted in testing liquid and to make this sensor 10 expose, this first ball float 30 can float on liquid level, and present different drafts according to the density of this testing liquid, this testing liquid then have partially liq by this shell 31 through hole 312 to flow in this first ball float 30 until inside and outside liquid level flushes, this second ball float 33 floats on the liquid level in this first ball float, and makes this second magnetic element 332 roughly trim liquid level, until this two ball float all transfixion time, the signal output module 124 of the internal circuit 12 of the control circuit 11 of this sensor 10 exports an initial tactile signal to this external circuit 13 to drive this transistor 131 and then to make this pulsed discharge module 132 export a pulse signal to this line of induction 21, when this pulse signal this through this line of induction 21 to should the second magnetic element 332 of the first magnetic element 32 of the first ball float 30 and the second ball float 33 time, this line of induction 21 can change generation vibration because of magnetic field and magnetic field vector changes and exports one first magnetic effect signal and the second magnetic effect signal respectively in this first magnetic element 32 and the second position of magnetic element 332 on operating bar 20, this first and second magnetic effect signal is received by this coil 133 and exports the signal receiving module 121 exporting to after this amplifier 134 amplifies this two magnetic effects signal again and export this internal circuit 12 after this two magnetic effects signal is become digital signal by analog-converted by this signal comparator 135 to, this signal contrast module 122 obtains this two magnetic effects signal by this signal receiving module 121, and calculate this pulse signal of output and receive the mistiming that this second magnetic effect signal reaches this signal contrast module 122, this testing liquid height (because the second magnetic element on this second ball float roughly flushes with liquid level) is calculated with this mistiming, because the coil 133 receiving this second magnetic effect signal is installed on this line of induction 21 one end away from this sensor 20, be this line of induction 21 one end close to the container bottom of accommodation testing liquid, can learn that this second magnetic element 332 is the height of testing liquid with the distance of this coil 133 further, this the second magnetic effect signal by this line of induction 21 to should the second magnetic element 332 position be passed to this coil 133, can be learnt by above describing, this testing liquid height and this second magnetic effect signal transmission to the pass of this coil 133 are: the testing liquid height=the second magnetic effect signal transmission speed on this line of induction 21 × this control circuit 11 output pulse signal and receive mistiming of this second magnetic effect signal.
Below disclose liquid level density sensor of the present invention judges this fluid density of density calculation of this testing liquid detailed process according to the mistiming between this first magnetic effect signal and the second magnetic effect signal.
Can be learnt by observation Fig. 4 A and Fig. 4 B, the testing liquid of Fig. 4 A is identical with the testing liquid height of Fig. 4 B, distance between first magnetic element 32 of Fig. 4 A and this second magnetic element 332 is d1, distance between first magnetic element 32 of Fig. 4 B and this second magnetic element 332 is d2, because the position of this second magnet 332 fixedly trims liquid level, the position of this first magnetic element 32 then can change with testing liquid density, density is higher, and the draft of this first ball float 30 then can reduce because buoyancy rises, and then the distance driving this first magnetic element 32 elevated height and shorten between this second magnetic element 332, can learn that the testing liquid density of Fig. 4 A is less than the testing liquid density of Fig. 4 B by this observations of d1>d2, observation Fig. 5 please be coordinate again to learn, the output of pulse signal time consistency of Fig. 4 A and Fig. 4 B, this second magnetic element 332 because of the testing liquid height of this Fig. 4 A and Fig. 4 B identical and be positioned at same position on this operating bar 20, and to should the second magnetic effect signal output time of the second magnetic element 332 position also roughly the same, but first magnetic element 32 of this Fig. 4 A and Fig. 4 B is highly different because testing liquid density is different, therefore the first magnetic effect signal output time of this Fig. 4 A is the first magnetic effect signal output time being later than this Fig. 4 B, by observing part B in Fig. 5, C part in Fig. 5, in Fig. 5, in E part and Fig. 5, F part can learn that first and second magnetic effect signal output time difference t1 of this Fig. 4 A is greater than first and second magnetic effect signal output time difference t2 of Fig. 4 B, can be learnt by above describing, it is poor that distance between first magnetic element 32 and this second magnetic element 332 is proportional to first and second magnetic effect signal output time, also to be inversely proportional to first and second magnetic effect signal output time poor for the density of meaning and testing liquid, the signal contrast module 122 of this internal circuit 12 calculates the density of testing liquid according to this first and second magnetic effect signal output time difference.
Again, then observation Fig. 4 A and Fig. 4 B can learn further, and second ball float 33 of Fig. 4 A and Fig. 4 B pastes together in shell 31 vicinity of this first ball float 30 and the one end away from this sensor 10 respectively, what Fig. 4 A represented is the minimum testing liquid density that the liquid level density sensor of tool magnetic ball float of the present invention can be measured, if testing liquid density is lower than this minimum testing liquid density, this first ball float 30 wholely can sink to this testing liquid, and second ball float 33 of oppressing in shell 31 makes this second ball float 33 float on liquid level, this second magnetic element 332 is positioned under liquid level, and then makes testing liquid elevation carrection occur error, and Fig. 4 B represents is the highest testing liquid density that the liquid level density sensor of tool magnetic ball float of the present invention can be measured, if testing liquid density is higher than this minimum testing liquid density, this first ball float 30 can this testing liquid of whole emersion, and drive the second ball float 33 emersion liquid level in shell 31, this second magnet 332 is positioned on liquid level, and then makes testing liquid elevation carrection occur error, can be learnt by above-mentioned explanation again, the position of this second magnetic element 332 can affect the measurement of testing liquid density, therefore, the density of testing liquid must could make the liquid level density sensor normal operation of tool magnetic ball float of the present invention between this minimum testing liquid density and the highest testing liquid density, testing liquid density and first and second magnetic effect signal output time difference are in a linear relationship to coordinate observation Fig. 6 to learn again, and the density corresponding to mistiming t1 is minimum testing liquid density, density corresponding to mistiming t2 is then the highest testing liquid density, again because density and mistiming relation are linearly, when the measured mistiming is between t1 and t2, can directly calculate with linear relationship, for example, if recording the mistiming is t (t2<t<t1), push away by linear relationship, " the testing liquid density " of corresponding t is " the highest fluid density+t × (minimum fluid density-the highest fluid density)/(t1-t2) ", compared to existing tool magnetic ball float liquid level density sensor measured by present hyperbolic relation density more easily calculate with distance.
In addition, because temperature when storing can affect the volume of testing liquid, when temperature improves, the volumetric expansion of testing liquid, the height of this testing liquid is made to increase, and upon a drop in temperature, the volumetric contraction of this testing liquid, the height of this testing liquid is declined, supvr is made to be difficult to confirm the storage capacity of this testing liquid, therefore this area can have a standard temperature (such as 25 degree Celsius) usually, and testing liquid height when usually supvr can get this standard temperature is as the physical holding of the stock amount of this testing liquid, refer to shown in Fig. 3, this control circuit 11 can have a temperature sensing circuit 40 further, this internal circuit 12 then has a signal compensation module 123 further, wherein this temperature sensing circuit 40 includes a temperature-sensitive sticker 41, one cold spot compensator 42, two multiplier 43 and two analog-digital converters 44, this temperature-sensitive sticker 41 is electrically connected with a wherein multiplier 43, this multiplier 43 is electrically connected to a wherein analog-digital converter 44 again, this digital analog converter 44 is electrically connected to the signal contrast module 122 of this internal circuit 12 again, and this temperature-sensitive sticker 41 is exported a temperature signal according to testing liquid temperature and amplified by this multiplier 43 and this digital analog converter 44 and export this signal compensation module 123 again to after changing this temperature signal, this cold spot compensator 42 is electrically connected with another multiplier 43, this multiplier 43 is electrically connected to another digital analog converter 44 again, this digital analog converter 44 is electrically connected to the signal compensation module 123 of this internal circuit 12 again, this cold spot sensor 42 is exported a cold spot compensating signal according to testing liquid temperature and is amplified by this multiplier 43 and this digital analog converter 44 and export this signal compensation module 123 again to after changing this cold spot compensating signal, this signal compensation module 123 then exports a compensating signal to this signal contrast module 122 according to this temperature signal and this cold spot compensating signal, this signal contrast module 122 is made to carry out liquid level compensation when calculating this testing liquid height in the lump according to this compensating signal, temperature when namely storing according to this testing liquid, when the temperature of this testing liquid is higher than this standard temperature, downgrade the height of this testing liquid of this signal contrast module 122 actual computation, when the temperature of this testing liquid is lower than this standard temperature, heighten the height of this testing liquid of this signal contrast module 122 actual computation, by this signal compensation module 123 and this temperature sensing circuit 40, make this supvr can learn the physical holding of the stock amount of this testing liquid with the height of this testing liquid when this standard temperature.
Refer to shown in Fig. 7 A, second embodiment of this liquid level density sensor being tool magnetic ball float of the present invention is in order to measure a two-phase interface testing liquid and to include a sensor 10, one operating bar 20 and 2 first ball floats 30, wherein this two-phase interface is from top to bottom respectively air/first liquid and first liquid/second liquid, proportion is then second liquid > first liquid > air from large to small, this 2 first ball float 30 then lays respectively at air/first liquid and first liquid/second liquid interface, the present embodiment is except having 2 first ball floats 30 and the proportion being positioned at the first ball float 30 of first liquid/second liquid interface is greater than the first ball float 30 being positioned at air/first liquid, all the other structures and principle are all identical with above-mentioned first embodiment.
Shown in Fig. 7 B to 7D, the longitudinal axis of Fig. 7 B represents pulse signal, the longitudinal axis representative of Fig. 7 C is positioned at the magnetic effect signal of the first ball float 30 of air/first liquid, the longitudinal axis representative of Fig. 7 D is positioned at the magnetic effect signal of the first ball float 30 of first liquid/second liquid interface, transverse axis t is then all the time, because first ball float 30 of corresponding diagram 7C is comparatively close to this sensor 10, the output order of magnetic effect signal is sequentially the second magnetic effect signal of first ball float 30 of corresponding diagram 7C, carry out the first magnetic effect signal of the first ball float 30 being corresponding diagram 7C again, next be the second magnetic effect signal of first ball float 30 of corresponding diagram 7D, carry out the first magnetic effect signal of the first ball float 30 being corresponding diagram 7D again, this control circuit 11 goes out this first testing liquid height with the Time Calculation of the second magnetic effect signal receiving corresponding diagram 7C, this the second testing liquid height is gone out again with the Time Calculation of the second magnetic effect signal receiving corresponding diagram 7D, again, this control circuit 11 calculates this first testing liquid density with the mistiming t1 between first and second magnetic effect signal receiving first ball float 30 of corresponding diagram 7C, this control circuit 11 calculates this second testing liquid density with the mistiming t2 between first and second magnetic effect signal receiving first ball float 30 of corresponding diagram 7D, and because this second ball float 33 is coated within the first corresponding ball float 30, the situation departing from this first ball float 30 can't be there is.
Can be learnt by this second preferred embodiment, this control circuit 11 judges this first and second liquid height respectively according to the 2 second magnetic effect signals received, this control circuit 11 calculates this first and second fluid density with the mistiming of two magnetic effect signals of each first ball float 30 again, just can be calculated liquid height and the density of heterogeneous interface by above-mentioned means simultaneously.
In sum, the liquid level density sensor of tool magnetic ball float of the present invention measures testing liquid density in a kind of mode being easy to density measurement really, therefore improves accuracy and decreases the trouble in correction; Again, this second ball float 33 is complete coated by this first ball float 30, make distance limit between the second magnetic element 332 on this second ball float 33 and the first magnetic element 32 on this first ball float 30 in certain limit, the further accuracy improving measurement, and user can be enable to measure the testing liquid of different densities with the present invention by the proportion of this first ball float 30 of adjustment and the second ball float 33.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a liquid level density sensor for tool magnetic ball float, is characterized in that, include:
One operating bar, it comprises a hollow tube and a line of induction; The wherein said line of induction wears and is fixed in described hollow tube;
One sensor, is arranged at one end of the hollow tube of described operating bar, and includes the control circuit of a tool calculation function, and described control circuit is electrically connected with the described line of induction;
At least one first ball float, it includes:
One shell, it has two the first relative perforation and at least one through holes; Two relative first perforation are inserted in wherein for described operating bar, described casing is located on described operating bar and can moves axially along described operating bar; Described through hole runs through and is formed on described shell, for making testing liquid flow into described shell;
One first magnetic element, is fixed on vertical with described operating bar in described shell and away from the one side of described sensor;
One second ball float, to be arranged in described shell and to have two the second relative perforation and one second magnetic elements; Two relative second perforation are inserted in wherein for described operating bar, described second ball float is sheathed on described operating bar and can moves axially along described operating bar; Described second magnetic element is fixed on described second ball float first magnetic element one end away from described first ball float; Again, the proportion of described second ball float is less than described first ball float; And
Range difference between wherein said first magnetic element and the second magnetic element and the density linearly linear relationship of described testing liquid, therefore described control circuit calculates the position of the corresponding described line of induction of the first magnetic element of described first ball float, behind the position of the corresponding described line of induction of the second magnetic element of the second ball float of corresponding described first ball float, namely with the range difference between the first magnetic element and the second magnetic element, described straight linear relation is contrasted to calculate the density of described testing liquid.
2. liquid level density sensor according to claim 1, is characterized in that, described control circuit according to the position of the corresponding described line of induction of the second magnetic element of the second ball float in described first ball float, to calculate the height of described testing liquid.
3. liquid level density sensor according to claim 1 and 2, is characterized in that, the proportion including multiple first ball float is different, and the proportion more away from the first ball float of described sensor is heavier; And the second ball float proportion difference in described multiple first ball float, the proportion more away from the second ball float of described sensor is heavier.
4. liquid level density sensor according to claim 2, is characterized in that, the step that described control circuit calculates the density of described testing liquid includes:
Export a pulse signal to the described line of induction, when described pulse signal can produce one first magnetic effect signal and the second magnetic effect signal respectively through first and second magnetic element described, the transmission speed of first and second magnetic effect signal wherein said on the described line of induction is identical and fixing;
Receive first and second magnetic effect signal described returned;
Calculate the mistiming of first and second magnetic effect signal, and the mistiming of first and second magnetic effect signal described in different testing liquid density and the density linearly linear relationship of described testing liquid, the range difference between wherein said mistiming and first and second magnetic element closes and is:
First and second magnetic effect signal mistiming=first and second magnetic element between the transmission speed of range difference/magnetic effect signal; And
With mistiming line correspondence linear relationship, try to achieve described testing liquid density.
5. liquid level density sensor according to claim 3, is characterized in that, the step that described control circuit calculates the density of described testing liquid includes:
Export a pulse signal to the described line of induction, when described pulse signal can produce one first magnetic effect signal and the second magnetic effect signal respectively through first and second magnetic element described, the transmission speed of first and second magnetic effect signal wherein said on the described line of induction is identical and fixing;
Receive first and second magnetic effect signal described returned;
Calculate the mistiming of first and second magnetic effect signal, and the mistiming of first and second magnetic effect signal described in different testing liquid density and the density linearly linear relationship of described testing liquid, the range difference between wherein said mistiming and first and second magnetic element closes and is:
First and second magnetic effect signal mistiming=first and second magnetic element between the transmission speed of range difference/magnetic effect signal; And
With mistiming line correspondence linear relationship, try to achieve described testing liquid density.
6. liquid level density sensor according to claim 2, is characterized in that, the step that described control circuit calculates described testing liquid height includes:
Export a pulse signal to the described line of induction, when described pulse signal can produce one second magnetic effect signal through described second magnetic element;
Calculate described control circuit output pulse signal and receive mistiming of described second magnetic effect signal: and
Try to achieve described testing liquid height with the described mistiming, wherein the pass of testing liquid height and mistiming is:
Testing liquid height=mistiming × transmission speed of the second magnetic effect signal on the described line of induction.
7. liquid level density sensor according to claim 4, is characterized in that, described control circuit includes an external circuit and an internal circuit, wherein:
Described external circuit is electrically connected with the described line of induction and described internal circuit and has:
One coil, in order to receive described magnetic effect signal;
One amplifier, itself and described coil electrical ties and amplify described magnetic effect signal;
One signal comparator, its be connected with described amplifier electric to obtain amplified after magnetic effect signal after convert described magnetic effect signal to digital signal by simulating signal after export described internal circuit to;
One transistor, is electrically connected with described internal circuit and uses as a switch; And
One pulse discharge circuit, is electrically connected with described transistor and exports described pulse signal to the described line of induction; And
Described internal circuit is electrically connected with described external circuit and has:
One signal receiving module, in order to receive the magnetic effect signal inputted from described external circuit;
One signal contrast module, it calculates the density of described testing liquid according to described magnetic effect signal; And
One signal output module, it exports an initial tactile signal to described external circuit and drives magnetic effect signal described in described output of pulse signal.
8. liquid level density sensor according to claim 5, is characterized in that, described control circuit includes an external circuit and an internal circuit, wherein:
Described external circuit is electrically connected with the described line of induction and described internal circuit and has:
One coil, in order to receive described magnetic effect signal;
One amplifier, itself and described coil electrical ties and amplify described magnetic effect signal;
One signal comparator, its be connected with described amplifier electric to obtain amplified after magnetic effect signal after convert described magnetic effect signal to digital signal by simulating signal after export described internal circuit to;
One transistor, is electrically connected with described internal circuit and uses as a switch; And
One pulse discharge circuit, is electrically connected with described transistor and exports described pulse signal to the described line of induction; And
Described internal circuit is electrically connected with described external circuit and has:
One signal receiving module, in order to receive the magnetic effect signal inputted from described external circuit;
One signal contrast module, it calculates the density of described testing liquid according to described magnetic effect signal; And
One signal output module, it exports an initial tactile signal to described external circuit and drives magnetic effect signal described in described output of pulse signal.
9. liquid level density sensor according to claim 7, is characterized in that, described internal circuit includes a signal compensation module further;
Described control circuit includes a temperature sensing circuit further, and it has:
One temperature-sensitive sticker, it exports a temperature signal according to described testing liquid temperature;
One multiplier, is electrically connected with described temperature-sensitive sticker and amplifies described temperature signal;
One analog-digital converter, is electrically connected with the signal compensation module of described multiplier and described internal circuit, and exports described signal compensation module to after converting described temperature signal to digital signal by simulating signal; And
Wherein said signal compensation module exports a compensating signal to described signal contrast module according to described temperature signal, and described signal contrast module then carries out liquid level compensation according to the height of described compensating signal to the described testing liquid calculated.
10. liquid level density sensor according to claim 7, is characterized in that, described internal circuit includes a signal compensation module further;
Described control circuit includes a temperature sensing circuit further, and it has:
One cold spot compensator, it exports a cold spot compensating signal according to described testing liquid temperature;
One multiplier, is electrically connected with described cold spot compensator and amplifies described cold spot compensating signal;
One analog-digital converter, is electrically connected with the signal compensation module of described multiplier and described internal circuit, and exports described signal compensation module to after converting described cold spot compensating signal to digital signal by simulating signal; And
Wherein said signal compensation module exports a compensating signal to described signal contrast module according to described cold spot compensating signal, and described signal contrast module then carries out liquid level compensation according to the height of described compensating signal to the described testing liquid calculated.
11. liquid level density sensor according to claim 7, is characterized in that, described internal circuit includes a signal compensation module further;
Described control circuit includes a temperature sensing circuit further, and it has:
One temperature-sensitive sticker, it exports a temperature signal according to described testing liquid temperature;
One cold spot compensator, it exports a cold spot compensating signal according to testing liquid temperature;
Two multipliers, are electrically connected to obtain described temperature signal and described cold spot compensating signal respectively with described temperature-sensitive sticker and described cold spot compensator respectively, and amplify described temperature signal and described cold spot compensating signal respectively;
Two analog-digital converters, be electrically connected with described two multipliers respectively, and be jointly electrically connected with the signal compensation module of described internal circuit, and export described signal compensation module to after converting described temperature signal and described cold spot compensating signal to digital signal by simulating signal respectively; And
Wherein said signal compensation module exports a compensating signal to described signal contrast module according to described temperature signal and described cold spot compensating signal, and described signal contrast module then carries out liquid level compensation according to the height of described compensating signal to the described testing liquid calculated.
12. liquid level density sensor according to claim 1 and 2, is characterized in that, first and second magnetic element described includes any one chemical element of Ni, Co or Fe.
13. liquid level density sensor according to claim 1 and 2, is characterized in that, the shape of first and second magnetic element described be annular, cylindricality, cube or irregular shape any one.
14. liquid level density sensor according to claim 1 and 2, is characterized in that, the material of described second ball float is expanded material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410016359.8A CN104776881A (en) | 2014-01-14 | 2014-01-14 | Liquid level density sensor provided with magnetic floating balls |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410016359.8A CN104776881A (en) | 2014-01-14 | 2014-01-14 | Liquid level density sensor provided with magnetic floating balls |
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| CN104776881A true CN104776881A (en) | 2015-07-15 |
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| CN201410016359.8A Pending CN104776881A (en) | 2014-01-14 | 2014-01-14 | Liquid level density sensor provided with magnetic floating balls |
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Application publication date: 20150715 |