CN203629645U - Multi-circle pulley type liquid level sensor device - Google Patents
Multi-circle pulley type liquid level sensor device Download PDFInfo
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- CN203629645U CN203629645U CN201320515352.1U CN201320515352U CN203629645U CN 203629645 U CN203629645 U CN 203629645U CN 201320515352 U CN201320515352 U CN 201320515352U CN 203629645 U CN203629645 U CN 203629645U
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Abstract
The utility model discloses a multi-circle pulley type liquid level sensor device for measuring liquid level of liquid in a well and a container. The sensor device comprises a mechanical floater which is tied on a tying rope and can slide up and down. The tying rope is mounted on one or more pulleys and can slide up and down along with the floater. The pulleys rotates forwardly and backwardly. Each pulley is mechanically coupled with a digital absolute magnetic rotation encoder device. Each encoder device is used for monitoring the total rotation angle of the corresponding pulley in real time. The total rotation angle of each pulley is converted into the distance away from the bottom through an algorithm so as to calculate liquid level. The reading of the encoder devices includes electric signals and optical signals. The electric signal output of the encoder devices may be used as the input of an industrial control system or transmitted to a remote control or the Internet through a passage. Accurate liquid level measuring is decided by the quantity of the rotary wheels of the encoder devices. The total rotation number of the pulleys consistent with omnibearing liquid level measuring can be adjusted by mechanical gears or belts.
Description
Technical field
The utility model relate to a kind of can measuring vessel or well in the sensor device of liquid level, relate in particular to a kind of with pulley, fasten the device combinations such as rope and absolute type magnetic rotary encoder and measure the liquid level sensor device of liquid level.
Background technology
In this technical field of liquid level sensor, listed the patent document of two description prior aries relevant to the application here.First is U.S. Pat 2012/006060601 " tether float type liquid level sensor ", this patent has been described a pulley-float-type device, in this device, buoys float is on liquid level, record output with a rotation sensor, and the mode that transfers data to remote location is provided.
Second United States Patent (USP) 5410913 " long-range indicator solution level sensor " that the prior art file about liquid level sensor is Blackburn, this patent has shown that one for surveying one group of Magnetic Sensor of motion of swingle top magnet.The application's a crucial innovative point is to survey motion with Magnetic Sensor, and uses electronic circuit to collect and transmit data.
In this technical field of rotary encoder, the applicant has applied for that an application number is CN201310040970.X, name is called the Chinese patent application of " absolute type magnetic rotary encoder ", a kind of rotary encoder of novelty has been described in this patented claim, compared with existing scrambler, it is advantageous that and used Magnetic Sensor rather than optical sensor, optical sensor is easily dirty, is also easily out of order.Structure, principle and the advantage of absolute type magnetic rotary encoder, be in detail also clearly recorded in the applicant's above-mentioned application.
There are some defects in liquid level sensor system of the prior art, they provide electronic output signal, but can not estimate.These scramblers are that these optical encoders are easily out of order because of dirty take optics as basis.At present, also there is no clear and definite method energy adjustment equipment so that it is widely used in the liquid level of various different depths in measuring well, do not have method to adjust the precision of level gauging yet.
Summary of the invention
The purpose of this utility model is to overcome the above problem that prior art exists, and provides that a kind of volume is little, cost is low, high-performance, liquid level sensor device that measuring accuracy is high.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of multi-turn pulley-type liquid level sensor device, it carries out electronic remote monitoring for the liquid level in container or well, and this sensor device comprises:
Float, it can fluctuate along with the variation of liquid level;
Two ends tie up to the rope of fastening on float;
At least one pulley, described pulley by be wound around thereon described in fasten rope and described float mechanical connection, along with sliding up and down of float, before and after described pulley, rotate;
With the magnetic encoder device that described pulley machinery is of coupled connections, this magnetic encoder device comprises:
Dwang,
One or more runners that can rotate with described dwang;
With described one or more runners permanent magnet, runner PCB and Magnetic Sensor one to one;
The outside detection circuit being electrically connected with described magnetic encoder device;
Described pulley fetches the mechanical couplings realizing with described magnetic encoder device by being electrically connected of its wheel shaft and described dwang;
Described magnetic encoder device is exported corresponding digital signal according to the anglec of rotation of described pulley;
Described outside detection circuit calculates current liquid level according to the digital signal of described encoder apparatus output.
Preferably, described pulley comprises a top pulley and a bottom pulley.Preferably, the wheel shaft of described top pulley is realized and being electrically connected of described dwang by the first coupling arrangement.
Preferably, described runner is connected with described bottom pulley.
Preferably, this sensor device also comprises a casing device, and described casing device further comprises that a housing base plate and is arranged on the housing top cover on described housing base plate.
Preferably, described housing top cover is made by transparent material, or is provided with a visual windows thereon.
Preferably, described top pulley and described magnetic encoder device are all positioned at described casing device the inside, are isolated from the outside by described casing device.
Preferably, described top pulley is positioned at described casing device the inside, described magnetic encoder device is positioned at described casing device outside, and Packed mechanical type feedthrough component is set between described housing top cover and the second coupling arrangement, for realizing the signal intercommunication between housing top cover and the second coupling arrangement.
Preferably, this sensor device also comprises a system PCB, and described system PCB extends out from described casing device, and described runner PCB is installed on it, and realizes being electrically connected between described runner by described runner PCB.
Preferably, the diameter of described top pulley is greater than the diameter of described runner, and the turning axle of described top pulley and the turning axle conllinear of described runner.
Preferably, near fastening rope described in, be provided with a protective device.
Preferably, described liquid level sensor device also includes a gear increaser or reduction gear, and this device can make the number of turns that described magnetic encoder device rotates and described runner truly rotate the number of turns to match.
Preferably, described gear increaser or reduction gear are the Coupled Friction wheel that can reduce friction, and described Coupled Friction wheel includes wheel hub and wheel shaft, and its turning axle is different from the turning axle of described top pulley and described runner.
Preferably, described outside detection circuit has wired and/or wireless data communications interconnecting function.
Preferably, the pass between total rotating cycle of first runner in one or more runners of described liquid level and described scrambler is: N=(L – L
empty)/(π * D*RF), total rotating cycle that wherein N is runner, L is by being surveyed liquid level, L
emptyliquid level during for dead slot, the overall diameter that D is described top pulleys, RF is coefficient of diminution.
The abbreviation that above and herein other PCB mentioning is everywhere printed circuit board (PCB) is called for short, and this is the usual abbreviations of those skilled in the art.
Compared with prior art, the utlity model has following beneficial effect:
The utility model can not only reduce volume, reduce costs, and can also improve performance.Except the output of energy electronics, vision output is also provided, this vision output is that the form of numbering runner and electron luminescence demonstration embodies.The output accuracy of each additional code runner has increased an order of magnitude, in principle the quantity of spendable coding runner is not limited.Provide a set of and boosted or step-down gear is calibrated the degree of depth that actual capabilities have been measured, this absolute type magnetic rotary encoder technology can be avoided contaminated environment.
The utility model has used physical space still less, has simpler control circuit, obtains the information about liquid level aspect for user provides more method.Sensor is more reliable, and liquid level measurement precision is also higher, less to the requirement of power supply, can power with the battery that is no more than 5 volts.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment technology, to the accompanying drawing of required use in embodiment technical description be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the sectional view of 2012/0060601 li of pulley-float type liquid level sensor of U.S. Pat.
Fig. 2 A-2D is front view and the sectional view of absolute type magnetic rotary encoder in prior art (5 runners, 5 sensor devices).
Fig. 3 A-3C is an embodiment of absolute type magnetic rotary encoder in prior art, the schematic diagram of 5 monophony scramblers and sensor code output table.
Fig. 4 A-4B is relation curve and voltage and the externally-applied magnetic field relation curve in the sensor output in absolute type magnetic rotary encoder and angle position in prior art, magnetic field.
Fig. 5 is the front view of a section of multi-turn pulley-type liquid level sensor of the present utility model.
Fig. 6 is the vertical view of some parts in the top device of the utility model multi-turn pulley-type liquid level sensor.
Fig. 7 is the end view of some parts in the pulley of the utility model multi-turn pulley-type liquid level sensor and encoder apparatus.
Fig. 8 is the sectional view of mechanical Coupled Friction wheel apparatus.
Fig. 9 is the side view of friction pulley in Fig. 8.
Figure 10 is the schematic diagram of outside detection circuit.
Embodiment
Below in conjunction with drawings and Examples, summary of the invention of the present utility model is further described.
Fig. 1 is the sectional view of prior art middle pulley-float type liquid level sensor.On this sensor, have one to fasten rope 11, its two ends all tie up on float 12, and the height of liquid level 13 will be measured, and float 12 is wanted can swim on liquid level 13.Arrow shown in figure represents to fasten the direction of motion of rope 11, is also the direction of motion of top pulley 15 and bottom pulley 16.Top pulley 15 rotates around turning axle 17, and its sense of rotation is 14, gives a rotary encoder apparatus (not showing this device in figure) by pulley spindle 18 by the torque transfer of top pulley 15.
Pulley spindle 18 is supported by support 21, and support 21 is arranged on shell bottom plate 22.In the ideal case, housing cap 23 provides mechanical protection, and isolates with external environment.Top pulley gear is arranged on chamber wall 25, in order to keep fastening the desired tension on rope 11, and under the effect of counterweight 26, bottom pulley 16 down slidings.Can select protection tube 27, make to fasten rope 11 and float 12 and remain in an ideal range of top pulley 15 belows.On protection tube 27, must have some holes or other structures to make liquid energy Free-flow mistake, the liquid level 13 outside 27 li of protection tubes and pipe is just identical like this.
Three width figure have shown the technological level of current absolute type magnetic rotary encoder technology below, and the Chinese patent application that this three width figure is CN201310040970.X from application number, includes this application entirety in reference at this.
A kind of typical runner, each runner can provide the output of 10 different numerical digits, also may also have other counting foundations.For example: the runner numbering of scrambler, from being 0 to 9, except having the output of electronics numerical value, also may provide a visual reading.A kind of common configuration is that (any numeral all likely for several runners, if be to need more runner after decades writing time) be arranged on together, first runner rotates a circle like this, will make second runner rotate 0.1 circle (general ratio is the not quantity of isotopic number of 1/()).Equally, except last runner, N runner rotates a circle, and N+1 runner just rotates 0.1 circle.This many wheel assemblings just can be recorded the reading of decades.
Existing coding techniques also comprises light transfer encoding, light reflection code and electrically contact coding.Optical means is easily because dirt and light pollution go wrong, and because light source and photo-detector need to cause expense higher by relevant electronic component.As time goes on, electrically contacting scrambler will be aging, and its reliability also can reduce.Other coding techniquess in the prior art also have magnetic target and the magnetic induction detector of alternating magnetization.Magnetic target is more expensive, and their precision own is limited to the ability of material permanent magnetization.A kind of cost is lower, more simply, more accurate magnetic coder disk will be useful to flowmeter and ammeter industry.
Several visual angle figure of the 5-runner absolute rotary encoder as shown in Fig. 2 A-2D.Whole device provides a kind of visual electronics mode to record the number of total coils that rightmost runner 101 rotates.Visual record is that the top counting from each runner starts.Therefore, in the time that current reading is 00019 circle, this means that rightmost runner 101 has turned a whole circle, and second circle that is near completion.We are by its called after " 10
0", because this represents take 10 magnitudes as radix.From right penultimate runner 102, be named as " 10
1", from the right side, third from the bottom runner 103, is named as " 10
2", from a right fourth from the last runner 104, be named as " 10
3", from right the 5th runner 105 reciprocal, be named as " 10
4".
Rotation number of turns relation between runner 102 and runner 101 is 10:1, this means 10
0 runner 101 often turns 10 circles, 10
1runner 102 just turns 1 circle.Equally, 10
1runner 102 often turns 10 circles, 10
2runner 103 just turns 1 circle.In general, 10
nrunner often turns 10 circles, and adjacent 10
n+1runner just turns 1 circle, and N is natural number.Although only shown 5-runner scrambler in figure, its principle can be applied on a scrambler with any amount runner easily.
The miscellaneous part showing in Fig. 2 A-2D rotates around turning axle 107.These parts have formed whirligig 121 together, as shown in Figure 2 D.Disk 110 is thin toroidals, and it is made up of soft magnetic material, for example ferronickel permeability alloys, Alperm or ferrite.On disk 110, have a structural change 113, it can be a hole, concavo-convex or other a magnetic texure.The disk 110 showing in this figure only has a structural change, but for a certain specific application, can have more structural change.
In stationary installation 122, have 114 and 5 sensors 116.1,116.2,116.3,116.4,116.5 of a permanent magnet, these 5 sensors are referred to as sensor 116.These installation of sensors are on printed circuit board (PCB) (PCB) 112, and PCB112 provides electrical connection for sensor 116, and it is also for the stationary installation 122 that includes permanent magnet 114 provides mechanical support.On stationary installation and whirligig, have many possible structural changes, the present embodiment is a typical embodiment.Permanent magnet 114 provides the magnetic field of magnetisable disk 110.Typically, the magnetic field of permanent magnet 114 be designed to along turning axle 107 axially, this magnetic direction is perpendicular to comprising PCB112 and sensor 116 in interior plane.So the reason of design is because the structural change 113 on magnetic conductivity disk 110 can change the magnetic direction in region in its vicinity.Along with the some sensors in sensor 116 are crossed in structural change 113 rotations, this sensor just can be measured the magnetic field of variation.This multiple sensor device, by decoding shown magnetic field value below, just can be known the angle at structural change 113 places of rotation.
We discuss this magnetic design in more detail now.As shown in Figure 3 C, can see the magnetic conductivity disk 110 representing by black and white in figure.In the application, used a cylindrical coordinates system, it radially points to outer (in the page) in Wei Cong center, represents by variable R, and its angle represents with variable θ, and also, in the page, Z-direction is perpendicular to the page.
It is for the concrete angle place in their positions that sensor 116.1-116.5 arranges like this, and their axial sensitivity can be with radially R be parallel.They do not have sensitivity in Z-direction and θ direction.Fig. 3 C has shown the angle of each sensor position and their sensitive direction, represents [116.1,0], [116.2,72], [116.3,144], [116.4,216], [116.5,288] with [sensor, sensitivity angle (degree)].The radius of their positions is also than 190R
tracklarger a little.According to magnetic model of the prior art, can learn at R
trackouter magnetic field is located outwardly-bent in left half of θ=0 ° larger than radius R, locate not bending in right half of θ=180 °.Magnetic field means that in positive dirction bending radially θ=0 ° located sub-fraction magnetic field, and this magnetic field is parallel to positive dirction radially.At the radial component B at sensing station place
radialmagnetic analog result be the curve 191 of describing in lower Fig. 4.Sensor 116.1 is designed to component B
radialthere is sensitivity, but component Bz is not had.If the sensor that θ=180 °, the figure lower right corner are located is being greater than radius R
trackplace, can not measure any magnetic field, and this is owing to ° locating in θ=180, B
radial=0.In a word, along with disk 110 is with respect to fixation of sensor 116.1-116.5 rotation, magnetic field amplitude that near a certain particular sensor structural change 113 records is very little but be greater than zero, and sensor is away from structural change 113 more, and amplitude is got over close to zero.
Therefore,, when magnetic conductivity disk is with respect to sensor rotation time, Magnetic Sensor can survey on magnetic conductivity disk, whether there is structural change.This effect is used to design magnetic encoder.Each sensor arranging by special angle position can provide electric signal, disk position difference, and corresponding electric signal is not identical yet.Electronic circuit can be converted into digital signal by the simulating signal of Magnetic Sensor, and for example, 1 representative has structural change, and 0 representative does not have structural change.And if make one group of structural change, for example structural change 113,1 and 113.2, so in the time that encoder wheel 101 and disk 110 together rotate with respect to fixation of sensor, in 10 positions of encoder wheel 101, a series of signal that each position obtains from sensor 116.1-116.5 is different.
The synoptic diagram of this kind of encoding scheme, as shown in Figure 3.Fig. 3 A has shown 10 Difference angles of disk 110 with respect to sensor 116.1-116.5.In the table of Fig. 3 B, the numeral in " numeral " hurdle show on runner corresponding to each position in 10 positions numbering." angle " hurdle demonstrates the numerical value of the anglec of rotation θ of ° beginning from θ=0." sensor number " hurdle has shown the numbering that is in the sensor existing on fixing circuit board for given angle position." sensor output value " hurdle shows the signal output of each sensor in 5 sensors.These 5 values are combined and have been formed the code value " 1 " at each angle place and the combination of " 0 ".These 5 digit numerical code are each marks above annulus in Fig. 3 A.The upper row of for example digital 4(, right side) from θ=0, ° beginning is along turning clockwise: sensor 116.1 and 116.4 not counter structure changes, and sensor 116.2,116.3 and 116.5 counter structures change.In the time that rotation angle value is θ=144 °, just there will be this situation, and output code is 10010.
Fig. 4 illustrates the relation curve between output and the magnetic field of 5-switch sensor.When disc rotary angle from θ=0 ° to θ=360 a ° whole circle, in θ=0 ° sensor of locating 116.1 measured and magnetic field that expection exists as shown in Figure 4 A.The below of figure axis is the anglec of rotation of disk 110, and left side axle is the magnetic induction density component B obtaining from magnetic field model
radial.Magnetic field (Gauss)-angle (degree) relation curve is the heavy line that indicates diamond sign in figure, i.e. curve 191.Right axis is the sensor output voltage of magnetic switch sensor, this sensor is described in the prior art.The relation curve of sensor output voltage (volt)-angle (degree) represents with the thin curve 192 in figure.
In Fig. 4 B, comprise the typical response of a commercial digital magnetic switch to the magnetic field applying.The simulating signal in magnetic field (being curve 196 in figure) is converted to the output of numeral (2-state) electronic signal by this switch.Transverse axis is magnetic field (Gauss), and the longitudinal axis is switch sensor output voltage (volt).Relation curve between the output voltage of numeral magnetic switch and the magnetic field applying is curve 193 in the drawings.It should be noted that and on curve, have hysteresis.In the time that the magnetic induction density applying is negative value, output voltage is low value V
l.Along with the increase of magnetic induction density, become on the occasion of, and increase to working point, the magnetic field B that exceedes definition
oP, sensor output value can change high value V into from low value
h.Then, along with magnetic induction density from large on the occasion of reducing gradually, output valve changes back to again the magnetic field point B that resets
rPtime low value V
l.Two switching threshold B in magnetic field
oPand B
rPshown in the dotted line 194 and 195 in first figure.Therefore, when the external magnetic field curve 191 of sensor passes dotted line B
oPand B
rPtime, sensor is exported as shown in the curve 193 in figure.
The simulation of magnetic sensor element is exported as shown in curve 196.When externally-applied magnetic field is close to zero, the response between output voltage and externally-applied magnetic field is linear.This curve is roughly antisymmetry with respect to B=0 point.At forward and the reverse magnetic induction density B place of large value, sensor is output saturation value V respectively
senseHand V
senseL.By careful design and structure Magnetic Sensor, just can obtain this sensor response.
It is more than the description to absolute type magnetic rotary encoder background technology.The application's innovation is to combine following two prior art fields: 1) pulley-type liquid level sensor, 2) absolute type magnetic rotary encoder.Be below the detailed description to present techniques, and several different embodiment are provided.
Embodiment 1: scrambler has 5 runners, each runner has 5 sensors, and there is pulley on top, and in can, external electrical communication unit is arrived in sealed electrical feedthrough, and in bottom pulley, has weights.
First embodiment of the application is as shown in Fig. 5,6,7.Fig. 5 is the sectional view of a forward sight.Shaft coupling 30 is for providing a mechanical connection between pulley spindle 18 and scrambler dwang 106.Support 21 has supported the weight of pulley spindle 18 and scrambler dwang 106 and additional acting force, and support 21 is arranged on the top of housing base plate 22.It is upper that 5 groups of runner PCB112 are arranged on system PCB31, and runner PCB112 is for providing electrical connection between sensor 116 and system PCB31, and they also can be other parts of encoder apparatus, and for example permanent magnet 114, provides some mechanical support.
Scrambler top device 1 has comprised all parts that are positioned on container or well head.Referring to Fig. 1, can see that the parts that hang in well only fasten rope 11, float 12, bottom pulley 16 and counterweight 26.Scrambler top device 1 contains a housing top cover 23, and it is arranged on housing base plate 22, and housing top cover 23 is for the protection of the miscellaneous part in scrambler top device 1, also may between the inside and outside environment of well or container, provide environmental sealing.
On housing base plate 22 and chamber wall 25, there are one or two rope holes 32.In the time that float 12 swims on liquid level 13, along with the variation of liquid level, fasten rope 11 and can move by easy on and off by rope hole 32.In the prior art example shown in Fig. 1, the friction force of fastening between rope 11 and top pulleys 15 has produced a moment of torsion, and this moment of torsion is transferred on scrambler dwang 106 by pulley spindle 18 and shaft coupling 30.Conversely, according to the design proportion of shown in Fig. 2 A-2D and described encoder wheel, this moment of torsion just causes encoder wheel to be rotated.
Fig. 6 is the vertical view of selected parts in top device 1.System PCB31 extends out from the shell that housing base plate 22 and housing top cover 23 form, and can come the parameatal gap that sealing system PCB31 stretches out with some sealants or packing ring.This kind of design provides easy electrical connection, data-interface, and without PCB is shifted out from sealing station, just can change where necessary battery.
The lower edge of system PCB31 has demonstrated some electric and data characteristicses.Power supply connects 71 provides power supply and ground loop, and electrical interconnection arrangement 33 is one group of wired socket terminal.These terminals can be used for the electric analogy control signal of sending and receiving standard, for example voltage, the electric current of 4-20mA and pulse-length modulation (PWM).The conventional network that internet-network interface 34 is standard provides interface, for example Ethernet, USB, live wire.Radio I/O 36(uses antenna 28 and signal 29, sees Fig. 1) be Wi-Fi, Bluetooth and Zigbee provide wave point.Vision output 35 provides a display that naked eyes just can be read, for example Lamplight displayer and/or light-emitting diode display.This display can demonstrate this basic system performance of picture " ON/OFF/mistake ", and how concrete information, for example current liquid level.
Fig. 7 is the end view of selected parts in pulley and encoder apparatus.The diameter of top pulley 15 is greater than the diameter of encoder wheel 101, and this is identical with Fig. 5.Note comprising in first embodiment shown in Fig. 5 and Fig. 6, the turning axle 17 of pulley and the turning axle 107 of scrambler are on same straight line, and other selections of these axles will be discussed in the back.
Embodiment 2: except having added a protection tube, other are identical with embodiment 1.
Although in Fig. 5, Fig. 6 and Fig. 7, not do not show, chamber wall 25 below fasten rope device near can add a structure, routine protection tube 27 as shown in Figure 1.The object of adding this structure is in order to keep float and other device features correct position at well or container, the object moving away from any destruction simultaneously.
Embodiment 3: except can has a transparency cover, can read intuitively outside the numeral on runner by this transparency cover, other are identical with embodiment 1.
Housing top cover 23 can be made by the transparent material as plastics, like this without removing the just value on read-out encoder runner 101-105 intuitively of top cover.In addition, if the opaque words of housing top cover 23 also can arrange a little transparency window on it.
Embodiment 4: substantially the same manner as Example 1, difference is mainly there is no vision reader.
Embodiment 5: substantially the same manner as Example 1, difference is mainly to have increased gear increaser or reduction gear and makes the number of turns that scrambler rotates and runner truly rotate the number of turns to match.
Four described concepts of embodiment and equipment are all applicable to the very wide well of depth range or container above.Because each runner of scrambler has represented the different orders of magnitude, outside described 5 rotary wheel device, add again one or more encoder wheel in the above, we just can increase the factor of 10 or more.In addition, extra encoder wheel can be for increasing the precision of depth survey.Due to a variety of causes, need to change the ratio of the encoder to count runner rotation number of turns and the total displacement of float, in two width figure below, show a kind of alter mode that can realize this function.
Fig. 8 has shown a kind of rotary wheel device that reduces friction, and Fig. 9 is its sectional view.Between pulley spindle 18 and scrambler dwang 106, machinery is provided with some extra runners, and these runners can change the ratio of pulley revolution and encoder wheel revolution.On pulley spindle 18, be also provided with center hub 41, in addition, be also provided with less the first Coupled Friction wheel 42, its wheel hub is 43, wheel shaft is 44.The rotating shaft of the first Coupled Friction wheel apparatus is from different before, and its rotating shaft is turning axle 47, and this rotating shaft helps out.
With identical before, by using shaft coupling 30 that the second Coupled Friction wheel 45 and wheel shaft 46 thereof are mechanically connected on the dwang 106 of scrambler.On device, the friction force at key point place can be ordered about the second Coupled Friction wheel 45 rotations.Friction force between center hub 41 and the first Coupled Friction wheel 42 has produced torque at pulley 18 and the first friction pulley 42 places, and the friction force between the wheel hub 43 of the first Coupled Friction wheel and the outside surface of the second Coupled Friction wheel 45 is taken turns 45 places at the second Coupled Friction and produced torque.
One " friction pulley device " is herein used to describe a kind of mechanical hook-up, and rotatablely moving of this mechanical hook-up can be transferred to another friction pulley from a runner.Although this is not a kind of unique method can be applicable on absolute liquid level instrument, this method occurs in the prior art.Also have other feasible methods, comprising: mechanical gear, magnetic coupling plate and universal joint.Desirable result is can revise and fasten the revolution of rope 11 floats that are connected 12 in given position generation.
Fig. 9 is the sectional view of friction pulley device in Fig. 8, and this figure has emphasized the interior diameter of wheel hub and the overall diameter of runner.The overall diameter of the first friction pulley 42 is D252, and its hub diameter is D151; The overall diameter of the second friction pulley 45 is D454, and its hub diameter is D353.The overall diameter of top pulley 15 is D555, and the diameter of center hub 41 is D656.
By the variation of confirming that the relation of rigidity runner between outside and inner mobile linear velocity calculated rotational speed.In addition, we not do not slide at hypothesis, just can obtain N runner and rotate time, at any move distance S at diameter D place are according to equation (1) below
S=π*D*N. (1)
If be positioned on same runner, but at different-diameter place, lay respectively at D1 and D2 place at 2, just can solve and obtain this 2 move distances separately by equation (1), again the two solving result is divided by, just can obtain their relative motion distance, as shown in equation (2)-(5).
S
1=π*D
1*N (2)
S
2=π*D
2*N (3)
S
1:S
2=D
1:D
2 （4）
S
1=S
2*D
1/D
2. （5）
Supposing is not having under the situation of sliding, and pulley center wheel hub 41 contacts with the first Coupled Friction wheel 42, and the wheel hub 43 of the first Coupled Friction wheel contacts with the second Coupled Friction wheel 45.This means on these contact points, identical at the move distance of surfaces externally and internally.But according to equation (4)-(5) above, can obtain the move distance of the wheel hub on a given friction pulley, but it varies in size.
Fastening under the effect of rope 11, the pass of pulley 15 between the move distance on its turning axle both sides is S5=S6*D5/D6 (6)
Wherein D5 is the diameter 55 of pulley center wheel hub, and D6 is pulley overall diameter 56.
The first pass of friction pulley 42 between the move distance on its turning axle both sides is S1=S2*D1/D2 (5)
Wherein, D1 is the diameter 51 of the first friction pulley 42 wheel hubs, and D2 is the overall diameter 52 of the first friction pulley 42.
The second pass of friction pulley 45 between the move distance on its turning axle both sides is S3=S4*D3/D4 (7)
Wherein, D3 is the diameter 53 of the second friction pulley 45 wheel hubs, and D4 is the overall diameter 54 of the second friction pulley 45.
In a word, these factors can obtain a series of clean motion reduction factors mutually at convenience,
RF=D5/D6)*(D1/D2)*(D3/D4) (8)
This reduction factor relates to two kinds of situations: as shown in Figure 8, fasten rope 11 and be wrapped in the second friction pulley wheel shaft 46 around.
We calculate total change amount of float 12 place liquid levels according to the number of turns of encoder wheel 101-105 rotation now.First, calculate in the situation that not slowing down, liquid level changes once corresponding rotating cycle; Then divided by reduction factor, represent surveyed liquid level with L, the span of supposing L is L
empty～L
full.
If fasten wheel shaft 46 that rope 11 is wrapped in the second friction pulley around, encoder wheel 101 is often revolved and is turned around, and the change amount of L is △ L, the variable △ L/N=π * D3 (9) that is changed to of equation (1)
What above formula represented is the situation that there is no deceleration, adds reduction factor to now formula (9), and it becomes
△L/N=π*D3*(D6/D5)*(D2/D1)*(D4/D3)=π*D4*(D6/D5)*(D2/D1)(10)
Utilize formula (10), for float 12 at L
emptyan above given liquid level, the revolution that encoder wheel is rotated
N=(L–L
empty)/[π*D4*(D6/D5)*(D2/D1)] (11).
Formula (11) is universal relation expression formula, and this expression formula is applicable to solve the reduction gear ratio of one group of specific runner.
Utilize formula (11), can also design for given well depth and given runner and rotate the needed reduction gear ratio of revolution.For example, if scrambler has 5 runners, this scrambler can provide up to 100,000(for example from 0 to 99,999) individual different rotary value.If well depth is 100 meters, so according to formula (11), just can obtain reduction factor
RF=π * D4* (D6/D5) * (D2/D1)=(L – L
empty)/N=100/100000=1x10
-3rice/turn (12)
Therefore,, for knowing the revolution of required encoder wheel and can meeting the situation of the well depth of those revolutions, formula (12) has provided a kind of practical ways that realize design reduction gear ratio.
Embodiment 6: pulley, not in can, arranges Packed mechanical type feedthrough component.
In the present embodiment, absolute type magnetic resistance scrambler can be positioned at outside sealed volume.A kind of feedthrough component rotatablely moving can be used as shaft coupling 30 and uses, and seal between housing top cover 23 and shaft coupling 30, as shown in the section part of Fig. 8, this is contrary with the embodiment shown in Fig. 5 and Fig. 6, in the embodiment shown in Fig. 5 and Fig. 6, housing top cover 23 surrounds encoder wheel assembly 101-105 completely.
Embodiment 7: encoder wheel is connected with bottom pulley.
Another embodiment is that encoder wheel is connected with bottom pulley, rather than connects on the top of well or container.Herein, bottom and top define according to gravitational direction, do not demonstrate this kind of situation in figure.In the present embodiment, having used an electronics to fasten scrambler and the top signal transmitting unit that rope or dedicated radio link install bottom is connected together.
Embodiment 8: substantially the same manner as Example 1, difference is not conllinear of turning axle.
Referring to Fig. 5, preferably set composite is designed to pulley turning axle 15 and the not situation of conllinear of scrambler turning axle 107, do not provide clearly this conception of species here.This conception of species is easy on the device that contains universal joint and some friction pulleys or gear accomplished.
Figure 10 is the circuit diagram of circuit system 37, and this circuit system is outside detection circuit, and it has wired and/or wireless data communications interconnect function.That provide support with primary circuit interconnection and for it is system PCB31, and this circuit obtains power supply from power input 71, and its earth terminal is 38.Inner voltage stabilizer 72 provides a steady voltage for internal circuit.The total quantity of supposing encoder wheel is N, now encoder wheel input end of analog signal is designated as to the first runner scrambler 61, the second runner scramblers 62, until N runner scrambler 63.Analog voltage signal (as shown in the curve 191 in Fig. 4) in each encoder wheel can flow to analogue amplifier and comparer 64.Each scrambler passage has a comparer, therefore always has N comparer 64.The digital signal (as shown in the curve 192 in Fig. 4) of the comparer high value of 64 output or low value, and digital signal is flowed to signal processor 65.Microcontroller 67 obtains Output rusults by an algorithm, and exports by digital output stage 66.Output rusults can be the preferential output form of numeral at electrical interconnection arrangement 33 places, can be also optics or vision output form that vision shows 35 places, can also be for example, digital data form for multiple standards pattern (Ethernet 34, WiFi36).
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (15)
1. a multi-turn pulley-type liquid level sensor device, it carries out electronic remote monitoring for the liquid level in container or well, it is characterized in that, and this sensor device comprises:
Float, it can fluctuate along with the variation of liquid level;
Two ends are connected to the rope of fastening on float;
At least one pulley, described pulley by be wound around thereon described in fasten rope and be connected with described float, along with sliding up and down of float, the rotation of described pulley;
With the magnetic encoder device that described pulley machinery is of coupled connections, this magnetic encoder device comprises:
One dwang;
One or more runners that rotate with described dwang;
With described one or more runners permanent magnet, runner PCB and Magnetic Sensor one to one;
The outside detection circuit being electrically connected with described magnetic encoder device;
Wherein, described pulley fetches the mechanical couplings realizing with described magnetic encoder device by being electrically connected of its wheel shaft and described dwang, described magnetic encoder device is exported corresponding digital signal according to the anglec of rotation of described pulley, and described outside detection circuit calculates current liquid level according to the digital signal of described encoder apparatus output.
2. multi-turn pulley-type liquid level sensor device according to claim 1, is characterized in that, described pulley comprises a top pulley and a bottom pulley.
3. multi-turn pulley-type liquid level sensor device according to claim 2, is characterized in that, the wheel shaft of described top pulley is realized and being electrically connected of described dwang by the first coupling arrangement.
4. multi-turn pulley-type liquid level sensor device according to claim 2, is characterized in that, described runner is connected with described bottom pulley.
5. multi-turn pulley-type liquid level sensor device according to claim 2, is characterized in that, this sensor device also comprises a casing device, and described casing device further comprises that a housing base plate and is arranged on the housing top cover on described housing base plate.
6. multi-turn pulley-type liquid level sensor device according to claim 5, is characterized in that, described housing top cover is made up of transparent material, or is provided with a visual windows on housing top cover.
7. multi-turn pulley-type liquid level sensor device according to claim 5, is characterized in that, described top pulley and described magnetic encoder device are all positioned at described casing device the inside and are isolated from the outside by described casing device.
8. multi-turn pulley-type liquid level sensor device according to claim 5, it is characterized in that, described top pulley is positioned at described casing device the inside, described magnetic encoder device is positioned at described casing device outside, Packed mechanical type feedthrough component is set between described housing top cover and the second coupling arrangement, for realizing the signal intercommunication between housing top cover and the second coupling arrangement.
9. multi-turn pulley-type liquid level sensor device according to claim 5, it is characterized in that, this sensor device also comprises a system PCB, described system PCB extends out from described casing device, described runner PCB is installed on it, and realizes being electrically connected between described runner by described runner PCB.
10. multi-turn pulley-type liquid level sensor device according to claim 2, is characterized in that, the diameter of described top pulley is greater than the diameter of described runner, and the turning axle of described top pulley and the turning axle conllinear of described runner.
11. multi-turn pulley-type liquid level sensor devices according to claim 1, is characterized in that, described in be provided with a protective device near fastening rope.
12. multi-turn pulley-type liquid level sensor devices according to claim 2, it is characterized in that, described liquid level sensor device also includes a gear increaser or reduction gear, and this device truly rotates the number of turns for the number of turns that makes described magnetic encoder device and rotate and described runner and matches.
13. multi-turn pulley-type liquid level sensor devices according to claim 12, it is characterized in that, described gear increaser or reduction gear are the Coupled Friction wheel that reduces friction, described Coupled Friction wheel includes wheel hub and wheel shaft, the not conllinear of turning axle of its turning axle and described top pulley and described runner.
14. multi-turn pulley-type liquid level sensor devices according to claim 1, is characterized in that, described outside detection circuit has wired and/or wireless data communications interconnecting function.
15. multi-turn pulley-type liquid level sensor devices according to claim 2, it is characterized in that, pass between total rotating cycle of first encoder wheel in described liquid level and described one or more encoder wheel is: N=(L – Lempty)/(π * D*RF), total rotating cycle that wherein N is described encoder wheel, L is by being surveyed liquid level, liquid level when Lempty is dead slot, D is the overall diameter of described top pulley, RF is coefficient of diminution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320515352.1U CN203629645U (en) | 2013-08-22 | 2013-08-22 | Multi-circle pulley type liquid level sensor device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320515352.1U CN203629645U (en) | 2013-08-22 | 2013-08-22 | Multi-circle pulley type liquid level sensor device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424162A (en) * | 2013-09-26 | 2013-12-04 | 江苏多维科技有限公司 | Multi-pulley type liquid level sensor device |
| CN106017615A (en) * | 2016-07-20 | 2016-10-12 | 哈尔滨今星微电子科技有限公司 | Absolute level meter |
-
2013
- 2013-08-22 CN CN201320515352.1U patent/CN203629645U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424162A (en) * | 2013-09-26 | 2013-12-04 | 江苏多维科技有限公司 | Multi-pulley type liquid level sensor device |
| WO2015043506A1 (en) * | 2013-09-26 | 2015-04-02 | 江苏多维科技有限公司 | Multiturn pulley liquid level sensor device |
| US9952085B2 (en) | 2013-09-26 | 2018-04-24 | MultiDimension Technology Co., Ltd. | Multiturn pulley liquid level sensor device |
| CN106017615A (en) * | 2016-07-20 | 2016-10-12 | 哈尔滨今星微电子科技有限公司 | Absolute level meter |
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Correction item: Application Date|Drawings Correct: 2013.09.26|The manual is correctly illustrated False: 2013.08.22|Manual, drawings, errors Number: 23 Volume: 30 |
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