CN203337221U - Liquid level sensor system - Google Patents
Liquid level sensor system Download PDFInfo
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- CN203337221U CN203337221U CN201320311296XU CN201320311296U CN203337221U CN 203337221 U CN203337221 U CN 203337221U CN 201320311296X U CN201320311296X U CN 201320311296XU CN 201320311296 U CN201320311296 U CN 201320311296U CN 203337221 U CN203337221 U CN 203337221U
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- permanent magnet
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Abstract
The utility model discloses a liquid level sensor system. The liquid level sensor system is used for performing remote monitoring to the liquid level in a container and comprises a first fixing portion, a primary response element, a second fixing portion and a secondary response element. A guide pipe inserted into the container is arranged under the first fixing portion and provided with a diversion hole to enable the liquid level in the guide pipe to be level off with the liquid level in the container, and the primary response element comprises a floater capable of vertically floating with change of the liquid level in the guide pipe, a rotating rod rotating around a relatively fixed rotary shaft in the vertical floating process of the floater and a permanent magnet. The second fixing portion is fixedly arranged on the first fixing portion and located above the first fixing portion. The secondary response element comprises a printed circuit board (PCB), a magneto-resistor angle sensor chip and a control circuit electrically connected with the magneto-resistor angle sensor chip, wherein the magneto-resistor angle sensor chip outputs an analog voltage signal to the control circuit according to a rotation angle of the permanent magnet, and the control circuit calculates the height of the liquid level according to the analog voltage signal.
Description
Technical field
The utility model has innovation at following sciemtifec and technical sphere: " liquid level sensor ", " magnetic angular sensor ", and " magnetic rotation sensor ", relate in particular to a kind of can measuring vessel in the level sensor system of liquid level.
Background technology
The utility model produces on the basis of existing technology.The United States Patent (USP) 5410913 of Blackburn, described one " long-range indicator solution level sensor ", and Fig. 1 is one of patent secondary schematic diagram for this reason just.The problem that Blackburn solves is just can read the liquid level in container by electronics without electronic component being placed in container.This is by a permanent magnet is placed on the device in container and realizes, and the electronics magnetic detecting is arranged outside container.
Particularly, inner permanent magnet is arranged on bend arm, and along with dwang reverses around central shaft, permanent magnet is followed bend arm and rotated together.The diameter of now permanent magnet rotation is larger, can reach several centimetres.The outer circular array be comprised of 9 Magnetic Sensors is surveyed the motion of permanent magnet.Carry out emission sensor with conventional angular separation on circular array, so at any time only have 1 or 2 sensors can detect the appearance of permanent magnet.Described Magnetic Sensor is magnet reed switch.Magnetic field force on a thin magnetic red sheet is enough large, and when can make this magnetic red bending tablet contact with second electronic contact, these motor operated switches just can produce and disconnect or closed action.This magnetic field force is to produce under the interaction by magnetic red sheet and externally-applied magnetic field.When externally-applied magnetic field reaches a certain threshold level, the magnetic red sheet will be crooked, makes the motor operated switch closure.When externally-applied magnetic field is less than threshold value, the magnetic red sheet just enough bending make the motor operated switch closure.
Had in the prior art some solid-state magnetic switches, these switches are without any physical action, and just the electronic disconnection of energy and closure, also have some magnetic switches can survey the anglec of rotation of dwang.
In the prior art, also there are some Magnetic Sensors can record the revolution of dwang around its axle rotation.
Specifically, the Fig. 1 to Fig. 3 in accompanying drawing comes from United States Patent (USP) 5410913.Fig. 1 is the sectional view that a kind of electronic remote is controlled liquid level sensor.This sensing system is placed on the top of container by a hole, electrical connection is arranged outside container chamber.This design needs container to break away from outside air, and in the middle of the environment in extraneous different temperatures and air pressure, these requirements are specifically to be applied and determine by it.Here two major parts that shown this system, device A and device B, device A is a mechanical socket, device B is an electronic sensor module.These two devices are mechanically coupled together under normal circumstances, here they are separately shown, are for the ease of observing and explaining.
There is an interphase at chamber wall 13 and sensor backing plate 10 places in device A, make a call to a gauge hole 12 and adjust liquid level sensing device on chamber wall 13.Conduit 14 provides a support structure for the vertical prolongation on liquid level sensing device, two pod apertures 27,28 are arranged on conduit 14, by these two pod apertures, liquid just can flow to tube chamber 38, and the liquid level of conduit 14 the insides is just identical with the liquid level 39 in container like this.
Along with the variation of liquid level 39, float 15 slides up and down along Z axis 16.The intersection point of our X-axis 8 and Z axis 16 is set to the initial point of our coordinate system, and the vertical page that points to of Y-axis 9 does not show in Fig. 1.Initial point is on the top end surface of conduit base plate 26.When liquid level 39, below Z=0, float 15 slides into Z=0, but, due to the cause of conduit base plate 26, can not continue down sliding.When the height of liquid level 39 higher than float 15, the accurate Calculation that is positioned at liquid level 39 above and below parts for float 15 depends on their ratios of proportion separately.Therefore, as long as the proportion of float 15 is less than liquid, it will vertically swim on liquid level, and liquid level 39 is just between its top and bottom, as shown in fig. 1 like this.
Upper end thin 19 of coilable rigidity has adhered to a permanent magnet 22, thin 19 of this rigidity is with right-angle bending, bend arm 21 beyond stretching out radially is when turning axle (Z axis) 16 rotation like this, and permanent magnet 22 will enter 30 li of the grooves that cut in fixing top board 29.In sensor backing plate 10, cutting is with holes 24, thin 19 of rigidity just from then on hole pass.The weight that the protruding ring 25 of upper end and the conduit base plate 26 of lower end are thin 19 of rigidity provides mechanical support.When float 15 slides up and down along turning axle 16, the lower end that rigidity is thin 19 will rotate around turning axle 16, but, owing to there being mechanical constraint, it can not move up and down vertically.
Between the vertical position of float 15 and angular displacement, accurate mechanical relationship can be kept by the physical boundary between conduit 14, thin 19 of rigidity and float 15.By using the slide plate 20 on float 15, between thin 19 of float 15 and rigidity, just formed a notch that slidably is similar to key slot.Guide rail 17 by use on conduit 14 and the groove 18 on float 15, just produced a slidably groove guide rail interface between float 15 and conduit 14, thin 19 of rigidity produces to be reversed, and as the function apart from Z from bottom, the normal direction on its face just can change reposefully like this.Thin upper part 19 ' of the rigidity of distortion is Z from the distance of bottom
full, in order to meet the demand of application-specific, the deviser can select a rational anglec of rotation θ
full.In this figure, with respect to the bottom part of thin 19 of rigidity, thin upper part 19 ' of rigidity reversed 360 °.Be placed with bend arm 21 directed in orthogonal of permanent magnet 22 in the angle of the normal direction of thin upper part 19 ' of rigidity, can obtain the anglec of rotation (strictly, thin upper part 19 ' of permanent magnet 22 and rigidity rotates together) of permanent magnet 22 and the general linear relation between liquid level 39 (and Z axis position of float 15).
By θ
levelas the variable of describing the anglec of rotation 102, Z
levelvariable as the vertical position of describing liquid level 39; The variable θ of the anglec of rotation 102 in tankful and dead slot state described
fulland θ
emptyfor constant; The variable θ of liquid level 39 in tankful and dead slot state described
fulland θ
emptyfor constant.Therefore, θ
leveland Z
levelbetween linear relationship can be written as:
θ
Level＝θ
Empty+(θ
Full-θ
Empty)*(Z
Level-Z
Empty)/(Z
Full-Z
Empty) (1)
To Z
levelsolve:
Z
Level＝Z
Empty+(Z
Full-Z
Empty)*(θ
Level-θ
Empty)/(θ
Full-θ
Empty) (2)
Device B has comprised 9 magnetic reed switch 41-49 and 9 resistance 61-69, and they are arranged on PCB35.Switch 41-49 is emitted in a circular array, and this array is coaxial with turning axle 16, and its radius can meet: only when permanent magnet 22 or while approaching the anglec of rotation of a given switch, trigger switch is enough removed greatly in the magnetic field of its generation.
Being electrically connected to flexible cord 33,34 transmits electric signal to PCB35 and transmits the electric signal that PCB35 sends.Sensor assembly top cover 36 and sensor assembly bottom 37 provide protection and mechanical support for PCB35.Finger type in device A fastens handle 31 and provides permanent or temporary transient Mechanical Contact to the notch 32 in device B.
Fig. 2 is sensor backing plate 10 and the fixing vertical view of top board 29.Finger type fastens handle 31 and discharges with conventional angular separation with respect to turning axle 16, and they all pass through the hole bolt on sensor backing plate 10.These architectural features have been fixed the position of switch 41-49 together, but do not affect the rotation of permanent magnet 22 around turning axle 16.
The vertical view that Fig. 3 is PCB35 and parts thereof.Switch 41-49 often leaves, and that is to say that they are non-conductive under " downfield " condition, but in high-intensity magnetic field, their closures, now their resistance is 0.When permanent magnet 22 a close specific switch, this switch closure.
While carrying out simple resistance measurement, terminals 50-51 is the outside electric contact of metering circuit.Resistance 61-69 connects between terminals 50 and 51.The end of each magnetic reed switch 41-49 is electrically connected to terminals 51, and the other end is connected with the contact point between every two resistance in resistance 61-69.If switch 41-49 all disconnects, the summation that between terminals 50 and 51, institute's measuring resistance is resistance 61-69 resistance.If only have switch 49 closures, institute's measuring resistance is resistance 61-68 resistance sum so.If only have switch 48 closures, institute's measuring resistance is resistance 61-67 resistance sum so.This computational logic is applicable to all position of the switch point, and permanent magnet 22 rotates to 360 while spending from 0 degree like this, closed one by one along with switch 41-49, and the institute's measuring resistance between terminals 50-51 increases in discontinuous mode.
Usually, it is that a kind of electronic remote of measuring for tank fill level with magnetic float and dwang is controlled level sensor system.The utility model has been used identical or similar rigid strip pivoting mechanism, but is a kind of improved magnetic transducing system.Ensuing two width figure will explain the magnetic detecting solid, and shown in figure is position and the direction of magnetic angular sensor and permanent magnet, and the anglec of rotation of permanent magnet is surveyed by angular transducer.
The schematic perspective view of the position relationship that Fig. 4 is magnetic field angular sensor chip and permanent magnet and sectional view.Permanent magnet 105 is around turning axle 16 along sense of rotation 101 rotations, and its rotation size is provided by the anglec of rotation 102.An electromagnetism resistance sensor chip is positioned at or close turning axle 16.Its inside sensing element is designed with sensitive axes along X-axis 8 and Y-axis 9.Magnetic field angular sensor chip 103 will be fixed with respect to surveying coordinate axis, and, when permanent magnet 105 rotation, can not move.Magnetic field angular sensor chip 103 is arranged on PCB104 in a kind of mode of standard.Be designed with a gap S106 between the upper surface of magnetic field angular sensor chip 103 and permanent magnet 105.
Each sensing element 103 li of magnetic field angular sensor chips has 2 output leads, altogether 4 output leads.Voltage in the X-axis sensor between the every pair of output lead, as shown in the curve 110 in Fig. 5; Voltage in the Y-axis sensor between the every pair of output lead, as shown in the curve 111 in Fig. 5.These curve representatives are along with the change of the anglec of rotation 102, the situation of change of voltage.
Described above is in the prior art general magnetic resistance rotation sensor.For example, two patents that application number is 201110130222.1 and 201110130202.4 have been described a kind of design that the magnetoresistive sensor element of potential application is arranged in magnetic field angular sensor.These patent documents are here as the application's reference.
But, there is certain defect in above-mentioned prior art, more much larger than the diameter of surveyed permanent magnet and liquid level gauge pipe such as magnetic detector system, they need a lot of Magnetic Sensors, and mechanical fault easily occurs these Magnetic Sensors based on mechanical motion.
Summary of the invention
The utility model provides a kind of can not only reduce size, reduce costs, and also can improve the level sensor system of performance.
The utility model is achieved through the following technical solutions above-mentioned target:
The utility model provides a kind of level sensor system, and it carries out remote monitoring for the liquid level in container, and described sensing system comprises:
Be fixedly installed on the first fixed part of vessel port place, the below of described the first fixed part is provided with the conduit inserted in container, offers a plurality of pod apertures on described conduit so that the liquid levels in described conduit maintains an equal level mutually with the liquid level in container; And
First order response element, it comprises:
Swim in the float on described liquid in conduit, it can fluctuate along with the variation of liquid in conduit;
Dwang, described dwang and the coupling of described float mechanical kilowatt, in the process fluctuated at described float, described dwang is around rotating with the relatively-stationary turning axle of described container;
Permanent magnet, it is arranged at the upper end of described dwang, with described dwang, rotates;
The second fixed part, it is fixedly installed on the first fixed part and is positioned at the top of the first fixed part;
Second level response element, it comprises the PCB that is fixedly installed on the second fixed part, be deposited on the upper and control circuit that be electrically connected mutually towards the magneto-resistor angular transducer chip of permanent magnet, with described magneto-resistor angular transducer chip of PCB;
Described magneto-resistor angular transducer chip is exported analog voltage signal according to the anglec of rotation of described permanent magnet to described control circuit, and described control circuit calculates the liquid level in current container according to analog voltage signal.
Preferably, the liquid level in conduit is from empty to full process, and described dwang has rotated n times of 360 degree, and wherein n is more than or equal to 1 integer, and the height of described liquid level and the anglec of rotation of described dwang are the linear ratio relation.
Preferably, described magneto-resistor angular transducer chip is to consist of the TMR sensing element.
Preferably, described magneto-resistor angular transducer chip has comprised two independently sensors, one of them is the X-axis sensor, another is the Y-axis sensor, the sensitive axes of described X-axis sensor is X-axis, the sensitive axes of described Y-axis sensor is Y-axis, and wherein X-axis and Y-axis are positioned at same plane, and the angle between X-axis and Y-axis is 90 °.
Further, in described dwang rotary course, the component of stray magnetic field in induction planes that the described permanent magnet above described magneto-resistor angular transducer chip produces has 360 degree symmetry.
Again further, described induction planes and XY plane parallel, and with the upper surface of described permanent magnet between be separated with mutually certain distance.
Preferably, the analog voltage signal of described magneto-resistor angular transducer chip output is the single-valued function of the anglec of rotation of described permanent magnet.
Preferably, described analog voltage signal is converted into the standardized digital signal form, and described standardized digital signal form is pulse-length modulation.
Further, the anglec of rotation of the output valve of described pulse-length modulation and described permanent magnet linear relationship in direct ratio.
Preferably, between described the first fixed part and described the second fixed part, removably connect.
Preferably, be provided with the adjustment structure of regulating the permanent magnet height between described the first fixed part and described container.
Preferably, offer a center pit on described the first fixed part, the upper end of dwang upwards passes in this center pit, and dwang is suspended on the first fixed part, also be provided with one on described the first fixed part for the seal casinghousing that container is isolated with the external world, described the second fixed part is relative with described seal casinghousing fixing.
Preferably, described control circuit comprises magnetic degree sensor circuit, power circuit and signal processing circuit.
Preferably, described sensing system includes a wireless sensor module, and described wireless sensor module realizes radio communication by wireless communication line, and described wireless sensor module obtains electric energy from battery.
Compared with prior art, the utility model has replaced the shaft-like magnetic arm of complicated bending with a simple direct rod shape magnetic arm, this compacter magnet arrangement can make the regular variation in magnetic field, just can survey the angle situation of change in magnetic field with a magnetic degree sensor on single position, this position or near the turning axle place of dwang.The utility model has replaced with a single solid-state reluctance switch this large circular array that 9 magnetic reed switchs are arranged.The liquid level sensor that the utility model provides has that size is less, control circuit is simpler, reliability resolution higher, detection of liquid level is higher, has adopted the advantages such as improved electrical communication method.
The accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model, for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the sectional view that the electronic remote in prior art United States Patent (USP) 5410913 is controlled level sensor system.
The vertical view that Fig. 2 is A part in Fig. 1.
The vertical view that Fig. 3 is B part in Fig. 1.
The schematic perspective view of the position relationship that Fig. 4 is magnetic field angular sensor and permanent magnet and sectional view.
The graph of relation of the anglec of rotation of the analog voltage signal that Fig. 5 is sensor and X-axis sensor, Y-axis sensor.
The sectional view of the level sensor system that Fig. 6 is the utility model the first embodiment.
The vertical view that Fig. 7 is device 1 in Fig. 6.
The vertical view that Fig. 8 is device 2 in Fig. 6.
The circuit block diagram that Fig. 9 is the magnetic degree rotation sensor.
The oscillogram that Figure 10 is pulse-length modulation output pulse width modulated output signal.
The graph of relation of the dutycycle that Figure 11 is the PWM waveform and anglec of rotation ratio.
The sectional view of the level sensor system that Figure 12 is the utility model the second embodiment.
Embodiment
Embodiment 1:
Fig. 6 is the sectional view that a kind of electronic remote is controlled level sensor system.As shown in Figure 6, a kind of level sensor system, this sensing system comprises the first fixed part 1, first order response element, the second fixed part 2 and second level response element.This sensing system is placed on the top of container by a hole, and in the outside of container chamber, electric connecting point is arranged.This design needs container to break away from outside air, and in the middle of the environment in extraneous different temperatures and air pressure, this is to be determined by its special applications.Two major parts that shown this system in figure, figure the latter half is the first fixed part 1 and first order response element, the first half is the second fixed part 2 and part second level response element.These two parts are mechanically coupled together under normal circumstances, here they are separately shown, are for the ease of observing and explaining.
The first fixed part 1 is fixedly installed on the opening part of container.Concrete, in the present embodiment, the first fixed part 1 comprises finger type spring lock 131, top flange 132.Be provided with adjusting bolt 128 between top flange 132 and chamber wall 140.By adjusting bolt 128 is regulated, just can carry out up-down adjustment to the position of top flange 132, to regulate the distance between permanent magnet and magneto-resistor angular transducer chip.Certainly, in the utility model, the connected mode between the first fixed part 1 and container is selected bonding and is welded as fixing method also within the application's protection domain.
The bottom of the first fixed part 1 is provided with conduit 14, and conduit 14 provides a support structure for the vertical prolongation on liquid level sensing device.Offer pod apertures 27 on conduit 14 in the present embodiment, by pod apertures 27, liquid just can flow to tube chamber 38, and the liquid level of conduit 14 the insides is just identical with the liquid level 39 in container like this, can on conduit 14, offer and pod apertures 28 identical in Fig. 1, this kind of situation do not show in Fig. 6 yet.
First order response element comprises float 15, dwang 19, permanent magnet 139.Thin 19 of the coilable rigidity that dwang 19 in the utility model is also above mentioned, float 15 can change and fluctuate along with the interior liquid level of conduit 14.Carrying out mechanical couplings by slide plate 20 between dwang 19 and float 15 is connected, in the process fluctuated at float 15, the mode of motion of dwang 19 is only that relative to container, fixing turning axle 16 rotates around one, and the permanent magnet 139 that is arranged on dwang 19 upper ends is also followed dwang 19 and rotated together.In the change procedure of liquid level 39 from the dead slot to the tankful, doubly, n equals 1 or be greater than 1 integer to the n that the angle of dwang 19 rotation is 360 degree.Liquid level 39 positions are the anglec of rotation relation in direct ratio of height and the dwang 19 of liquid level.For example, during the container dead slot, liquid level 39 is 0%, and the anglec of rotation of dwang 19 is 0 degree, and when liquid level is 50%, the anglec of rotation of dwang 19 is 180 degree, and during the container tankful, liquid level 39 is 100%, and the anglec of rotation of dwang 19 is 360 degree.
Particularly, in the present embodiment, the top of dwang 19 is fixed with a disk 137.The head portion of the weight of disk 137 and its other acting forces that apply, dwang 19 and other all additional materials are supported by support ring 134, and support ring 134 is the wedge angle outshot on support bar 133.Permanent magnet 139 is bonded on the top end face of disk 137.Groove 135 and snap ring 136 mechanical constraint the upper part of dwang 19 move up.When float 15 vertically during lower slider, dwang 19 is around turning axle 16 rotations, thereby drives the rotation of permanent magnet 139.But owing to there being the mechanical constraint of having described, so dwang 19 can not move vertically.Identical in relation between the normal orientation of dwang 19 upper parts and the vertical position of liquid level 39 and Fig. 1, and the Machine Design of float 15, guide rail 17 and groove 135 is also with identical in Fig. 1.The described θ of equation 1 that in Fig. 1, the embodiment of prior art mentions
leveland Z
levelbetween linear relationship be applicable to too the present embodiment.
The second fixed part 2 is positioned at the top of the first fixed part 1, and the second fixed part 2 is with first fixed part 1 is relative is fixedly connected with.In the present embodiment, the first fixed part 1 is formed with the upwardly extending finger type spring lock 131 of relative flange 132, is provided with the notch corresponding with finger type spring lock 131 126 on the second fixed part 2.Adopt this kind of design can realize the second fixed part 2 is removed from the first fixed part 1.Between the second fixed part 2 and the first fixed part 1, be fixing permanent adhesive or temporarily bonding, this depends on actual demand.
In the present embodiment, the second fixed part 2 comprises top board 121 and base plate 122.Be provided with a notch 126 in top board 121 the insides, by notch 126, top board 121 is latched by finger type spring lock 131.By on top board 121, PCB104 and base plate 122, mating holes 138 being set, they are fixed together.The mating holes of top board 121 is screw-shapeds, does not demonstrate screw in figure.If they are permanent installations, threaded hole should be just on the top flange 132 of device so, and the mating holes on top board 121 and base plate 122 should be through hole.The second fixed part 2 also can fix PCB104 by using a removable retention clip, does not draw this permanent installation method and retention clip in figure.
Be formed with a plurality of upwardly extending projections on base plate 122, comprise for the sensor support 123 to the 103 formation supports of magneto-resistor angular transducer chip, for PCB104 being formed to the circuit board bottom support 124 supported.Be formed with a plurality of projections to downward-extension on top board 121, comprise for PCB104 being formed to the circuit board top braces 125 supported.The purpose of these three supports be rotation in order to stop PCB104 and magneto-resistor angular transducer chip 103 with respect to any vibration or the movement of permanent magnet 139, so just can avoid producing wrong magnetic signals 103 li of magneto-resistor angular transducer chips.
These parts are linked together to other methods of attachment also within protection domain of the present utility model.These methods comprise: the electric encapsulation technology of the standard that encapsulating, external clamp, rivet, injection molten plastic and other all public are known.The function of these fixing meanss has: 1) keep magneto-resistor angular transducer chip 103 suitable position on turning axle 16, and at the S106 place, gap of design; 2) can connect power supply; 3) can data communication connect; 4) environment of protection magnetic rotation sensor.The selection of the material of these parts, Embedding Material, securing member need to meet two conditions: the compatible and optional vision definition of magnetic (if necessary, can estimate the top of disk 137 and/or the rotation of feature, line or mark on permanent magnet 139, using it as a kind of auxiliary measuring method and collimation technique).
Preferably, can also be in the additional magnetic shielding piece (not shown) in the top of top board 121, this way can not change the physical property of the magneto-resistor angular transducer chip 103 of its below, but can better between the field source of magneto-resistor angular transducer chip 103 and the second fixed part 2 outsides, provide " magnetic shielding ".Every other parts on the second fixed part 2, top flange 132 should be nonmagnetic metal, plastics, timber, glass, pottery, polymkeric substance etc.
If need to be checked by vision, all layers above permanent magnet 139 all must be selected transparent material so, and offer a perforation in the corresponding position of PCB104 to form the pathways for vision (not shown).
Second level response element comprises the printing board PCB 104 that is fixedly installed on the second fixed part, it is upper and towards the magneto-resistor angular transducer chip 103 of permanent magnet 139 to be deposited on printing PCB104.Preferably, magneto-resistor angular transducer chip 103 consists of the TMR sensing element, and its anglec of rotation according to permanent magnet 139 is exported analog voltage signal to control circuit, and control circuit calculates the liquid level in current container according to analog voltage signal.
Fig. 7 is the vertical view of removing the second fixed part 2 and second level response element.It has shown the anglec of rotation 102 positions and the permanent magnet 139 of dwang 19 upper parts, and permanent magnet 139 has a rotary direction of angle 101 about turning axle 16.Magneto-resistor angular transducer chip 103 does not rotate.Mounting hole 142 by the top flange, be fixed to top flange 132 on chamber wall 140 with bolt 128.
The vertical view that Fig. 8 is some parts in the second fixed part 2 and second level response element.Demonstrated the circular contour of base plate 122 in figure, top board 121 does not show in the drawings, has only shown the notch 126 alignd with finger type spring lock 131.The front that rectangular profile is printing board PCB 104, its key feature comprises mating holes 138 and magneto-resistor angular transducer chip 103.The electric connecting terminal that left end is PCB104, they comprise supply terminals 151, and signal terminal 152 and earth terminal 153 can weld pliable and tough wire at these terminals, the card-edge connector of a standard can slide at this end, or spring clamp connector can be clipped in this end of PCB104.The circuit board bottom support 124 of projection is for PCB104 provides mechanical support, and magneto-resistor angular transducer chip 103 is supported by protruding sensor support 123.
In the first embodiment, as shown in Figure 6, not perforate on the top flange 132 of the first fixed part 1, unless for bolt connecting container wall 140.And in the present embodiment, offering a center pit on flange 220, the narrows above dwang 19 pass in this center pit, and dwang 19 is suspended on flange 220, as shown in figure 12.Being provided with one on flange 220 is fixedly connected with seal casinghousing 221 for seal casinghousing 221, the second fixed parts 4 that container is isolated from the outside.Specifically, be provided with on seal casinghousing 221 on finger type fastening handle 222, the second fixed parts 4 and be provided with finger type and fasten the corresponding notch of handle 222.Support ring 134 moves on to the top of flange 220, the weight of its support disk 137 and other acting forces.Identical in groove 135 and snap ring 136 and Fig. 6.Do not show in figure that part is also with identical in Fig. 6.
The liquid level sensor signal can be used for higher level system, must possess the method for linking up with higher level system.It also may reduce the original analog signal of magnetic degree sensor, and the signal that can be used for Digital Electronic Technique is provided.Interchange between sensing system and higher level system can be passed through one group of electric wire, a data bus (I
2c, RS232, IEEE488, Ethernet, USB etc. are similar) or wireless network (WIFI, bluetooth, Internet of Things etc.) realize, the communication protocol of selecting which kind of mode to be selected by the user decides.In addition, the optical signal that this communication also can be such by light-emitting diode display realizes, this signal can be read the people of the same space with container.Certainly, use the combination of these means of communication and similarly the liquid level sensor of additive method also within protection domain of the present utility model.
The circuit block diagram that Fig. 9 is the high-level circuit of magnetic Long-distance Control liquid level sensor in the utility model.This control circuit mainly contains three circuit modules, and each circuit module has one or more electronic circuits.These three main circuit modules are magnetic degree sensor circuit 161, power circuit 162 and signal processing circuit 163.Here this special selection that mandatory declaration is divided into electronic circuit by circuit is not unique, not limited by protection of the present utility model, and it is just in order more easily to explain the many parts in the utility model and the utility model.
Magnetic degree sensor circuit 161 is electrically connected mutually with magneto-resistor angular transducer chip 103, this chip has comprised X-axis magnetoresistive transducer 171 and Y-axis magnetoresistive transducer 172, the sensitive axes of X-axis magnetoresistive transducer 171 is X-axis, the sensitive axes of Y-axis magnetoresistive transducer is Y-axis, wherein X-axis and Y-axis are positioned at same plane, and between them, angle is 90 degree.The induction planes of this two sensors and XY plane parallel, be separated with certain distance between the upper surface of this induction planes and permanent magnet 139, mutually as shown in the gap S106 in Fig. 4.The output of this two sensors is as shown in the curve 110 and 111 in Fig. 5.Magnetic degree sensor circuit 161 has two electronic circuits: one provides and Y-axis magnetoresistive transducer 172 and V for X-axis magnetoresistive transducer 171
cC164 or V
ref170 are connected, and another is connected with earth terminal 166 with Y-axis magnetoresistive transducer 172 for X-axis magnetoresistive transducer 171.
Signal processing circuit 163 has many functions.In brief, be exactly that communications protocol 177 has defined the method that receives information from sensing system, signal processing circuit 163 must receive the primary voltage signal from magnetic degree sensor circuit 161, and this signal is converted into to a kind of acceptable form.First electronic circuit is simulation pre-amplification circuit 173, and this circuit amplifies signal value according to design load, and helps to remove otiose signal with wave filter.Second electronic circuit is analog-to-digital conversion circuit 174, this circuit receives the simulating signal (unit means with volt or ampere) of the amplification of simulation pre-amplification circuit 173 outputs, and these signals are converted into to digital signal (unit means with bit).The 3rd electronic circuit is output format circuit 175, contains digital circuit and algorithm, is mainly that the digital signal that analog-to-digital conversion circuit 174 is produced is converted into value and the form that can be accepted by communications protocol 177.Next electronic circuit is microcontroller circuit 176, mainly to carry out communication by input/output circuitry 178 (also being called digital interface circuit) and communications protocol 177, and the data of 180 li of storage and retrieve data circuit 179 and system, control circuits, system, control circuit 180 is for other electronic circuit transmitted signals in system.The output signal of microcontroller circuit 176 is V
oUTPUT165.
Embodiment 4
A simulating signal from measured X-axis sensor and Y-axis sensor obtains liquid level Z
levelsimple circuit methods as follows.Recycling equation (2) has:
Z
Level＝Z
Empty+(Z
Full-Z
Empty)*(θ
Level-θ
Empty)/(θ
Full-θ
Empty). (2)
From Fig. 5, we can see that curve 110 and 110 is respectively symmetry curve sin (θ
level) and cos (θ
level), also can find out that the analog voltage signal that X-axis sensor and Y-axis sensor are exported is anglec of rotation θ
levelsingle-valued function.Therefore, we can monitor these two groups of analog voltage outputs of magneto-resistor angular transducer chip 103, by inspection or automatic look-up table, those output valves are converted into to one and are applicable to θ
levelvalue.
Because X-axis sensor and Y-axis sensor are to export corresponding analog voltage signal according to the anglec of rotation of permanent magnet 139, thus the signal reaction of their output the magnetic field situation that produces of permanent magnet 139.Curve 110 from Fig. 5 and 111 can find out, the component of the stray magnetic field that permanent magnet produces in induction planes has 360 degree symmetry, and, in 360 degree scopes of permanent magnet rotation, total range value of stray magnetic field is constant, the direction difference.
Embodiment 5
In an embodiment of the present utility model, output signal is formatted as a pulse width modulated format, and this form has only been used three electric connecting terminals: power supply V
cC164, signal output 165 and ground connection GND166.These terminals are connected with 153 with the pad 151,152 that is connected on PCB104 respectively.
The present embodiment has been described a liquid level detection system that digital processing output is arranged.Here, curve 110 and 111 two linear analogue voltage signals that show are converted into to a single digital waveform, this waveform is the waveform 30 in Figure 10.This curve is representing the relation between voltage and time signal, and the time is transverse axis, and waveform 30 is one fixed cycle 21T
cyclecyclical function.The magnitude of voltage of waveform 30 is not to be V
low24, be exactly to be V
high25.Each cycle of waveform 30 is at voltage V
highthe time at 25 places is T
high22, at voltage V
lowthe time at 24 places is T
low23.In Figure 10, shown T
highand T
lowbe respectively 700 microseconds and 300 microseconds, T
cycle21 is 1000 microseconds.T
high22 and T
cycle21 analogy is called " output duty cycle ", with number percent (%), means.30 li of shown waveforms, output duty cycle is (700/1000)=70%.
As shown in Figure 11 figure, by a self-definition design circuit and program, two sine and cosine Waveform Inputs on curve 110 and 111 are converted into to curve 29, this figure is that output duty cycle (%) and the anglec of rotation are than the graph of a relation between (%), due to θ
leveland Z
levelbetween this linear relationship, just be equal to output duty cycle (%) and liquid level than the graph of a relation between (%) shown in curve 29, shown in Figure 10 and Figure 11 is just pulse-length modulation (PWM).In technology, it is a kind of output pattern of knowing.Many digital algorithms can be decoded into output duty cycle the variable of any needs.Therefore, PWM is the method for the digital waveform of a kind of random simulating signal by any amplitude and shape rule of changing into standard feature.
The control circuit that includes magneto-resistor angular transducer chip 103 and line related and control electronic installation, this control circuit builds on PCB104 with the method for knowing in technology, the stacking diagram of the vertical view of PCB104 and turning axle 16, dwang 19 upper parts, as shown in Figure 7 and Figure 8.It is on the connection pad 151,152,153 of PCB104 left end that external power supply is connected with signal, the tie point of power end, output terminal and earth terminal that these three pads are respectively pulse-length modulation (PWM).The upper part of dwang 19 rotates to 324 ° of positions from 0 ° of position, and the PWM Voltage-output between connection pad 152 and 153 is as shown in the curve 29 of Figure 11.In the middle of this embodiment of the present utility model, the anglec of rotation can not surpass 360 degree.
As shown in figure 12, sensor assembly 231 does not show that outlet connects, and it obtains electric energy from battery 232, and utilizes radio communication diagram 233 to carry out communication by communications protocol 177.
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 (14)
1. a level sensor system, it carries out remote monitoring for the liquid level in container, it is characterized in that, and described sensing system comprises:
Be fixedly installed on the first fixed part of vessel port place, the below of described the first fixed part is provided with the conduit inserted in container, offers a plurality of pod apertures on described conduit so that the liquid levels in described conduit maintains an equal level mutually with the liquid level in container;
First order response element, it comprises
Swim in the float on described liquid in conduit, it can fluctuate along with the variation of liquid in conduit;
Dwang, described dwang and the coupling of described float mechanical kilowatt, in the process fluctuated at described float, described dwang is around rotating with the relatively-stationary turning axle of described container;
Permanent magnet, it is arranged at the upper end of described dwang, with described dwang, rotates;
The second fixed part, it is fixedly installed on the first fixed part and is positioned at the top of the first fixed part;
Second level response element, it comprises the PCB that is fixedly installed on the second fixed part, be deposited on the upper and control circuit that be electrically connected mutually towards the magneto-resistor angular transducer chip of permanent magnet, with described magneto-resistor angular transducer chip of PCB;
Described magneto-resistor angular transducer chip is exported analog voltage signal according to the anglec of rotation of described permanent magnet to described control circuit, and described control circuit calculates the liquid level in current container according to analog voltage signal.
2. level sensor system according to claim 1, it is characterized in that: the liquid level in conduit is in empty extremely full process, described dwang has rotated n times of 360 degree, wherein n is more than or equal to 1 integer, and the height of described liquid level and the anglec of rotation of described dwang are the linear ratio relation.
3. level sensor system according to claim 1, it is characterized in that: described magneto-resistor angular transducer chip is to consist of the TMR sensing element.
4. level sensor system according to claim 1, it is characterized in that: described magneto-resistor angular transducer chip has comprised two independently sensors, one of them is the X-axis sensor, another is the Y-axis sensor, the sensitive axes of described X-axis sensor is X-axis, the sensitive axes of described Y-axis sensor is Y-axis, and wherein X-axis and Y-axis are positioned at same plane, and the angle between X-axis and Y-axis is 90 °.
5. level sensor system according to claim 4, it is characterized in that: in described dwang rotary course, the component of stray magnetic field in induction planes that the described permanent magnet above described magneto-resistor angular transducer chip produces has 360 degree symmetry.
6. level sensor system according to claim 5 is characterized in that: described induction planes and XY plane parallel, and with the upper surface of described permanent magnet between be separated with mutually certain distance.
7. level sensor system according to claim 1 is characterized in that: the analog voltage signal of described magneto-resistor angular transducer chip output is the single-valued function of the anglec of rotation of described permanent magnet.
8. level sensor system according to claim 1, it is characterized in that: described analog voltage signal is converted into the standardized digital signal form, and described standardized digital signal form is pulse-length modulation.
9. level sensor system according to claim 8, is characterized in that: the output valve of described pulse-length modulation and the anglec of rotation of described permanent magnet linear relationship in direct ratio.
10. level sensor system according to claim 1, is characterized in that: between described the first fixed part and described the second fixed part, removably connect.
11. level sensor system according to claim 1 is characterized in that: be provided with the adjustment structure of regulating the permanent magnet height between described the first fixed part and described container.
12. level sensor system according to claim 1, it is characterized in that: on described the first fixed part, offer a center pit, the upper end of dwang upwards passes in this center pit, and dwang is suspended on the first fixed part, also be provided with one on described the first fixed part for the seal casinghousing that container is isolated with the external world, described the second fixed part is relative with described seal casinghousing fixing.
13. level sensor system according to claim 1 is characterized in that: described control circuit comprises magnetic degree sensor circuit, power circuit and signal processing circuit.
14. level sensor system according to claim 1, it is characterized in that: described sensing system includes a wireless sensor module, described wireless sensor module realizes radio communication by wireless communication line, and described wireless sensor module obtains electric energy from battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320311296XU CN203337221U (en) | 2013-05-31 | 2013-05-31 | Liquid level sensor system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320311296XU CN203337221U (en) | 2013-05-31 | 2013-05-31 | Liquid level sensor system |
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| CN203337221U true CN203337221U (en) | 2013-12-11 |
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ID=49705890
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320311296XU Expired - Lifetime CN203337221U (en) | 2013-05-31 | 2013-05-31 | Liquid level sensor system |
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| CN (1) | CN203337221U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278216A (en) * | 2013-05-31 | 2013-09-04 | 江苏多维科技有限公司 | Liquid level sensor system |
| CN109443495A (en) * | 2019-01-16 | 2019-03-08 | 浙江湖州新京昌电子有限公司 | A kind of reluctance type sealing non-contact liquid level sensor |
| CN111380596A (en) * | 2018-12-25 | 2020-07-07 | 矢崎总业株式会社 | Liquid level detection device |
| TWI718558B (en) * | 2019-06-14 | 2021-02-11 | 桓達科技股份有限公司 | Liquid level sensor device with double-layer flexible tube and packaging structure thereof |
-
2013
- 2013-05-31 CN CN201320311296XU patent/CN203337221U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278216A (en) * | 2013-05-31 | 2013-09-04 | 江苏多维科技有限公司 | Liquid level sensor system |
| WO2014190943A1 (en) * | 2013-05-31 | 2014-12-04 | 江苏多维科技有限公司 | Liquid level sensor system |
| US9964427B2 (en) | 2013-05-31 | 2018-05-08 | MultiDimension Technology Co., Ltd. | Liquid level sensor system |
| CN111380596A (en) * | 2018-12-25 | 2020-07-07 | 矢崎总业株式会社 | Liquid level detection device |
| CN109443495A (en) * | 2019-01-16 | 2019-03-08 | 浙江湖州新京昌电子有限公司 | A kind of reluctance type sealing non-contact liquid level sensor |
| TWI718558B (en) * | 2019-06-14 | 2021-02-11 | 桓達科技股份有限公司 | Liquid level sensor device with double-layer flexible tube and packaging structure thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |