CN102749118B - Liquid volume sensor - Google Patents
Liquid volume sensor Download PDFInfo
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- CN102749118B CN102749118B CN201210257483.4A CN201210257483A CN102749118B CN 102749118 B CN102749118 B CN 102749118B CN 201210257483 A CN201210257483 A CN 201210257483A CN 102749118 B CN102749118 B CN 102749118B
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- 239000007788 liquid Substances 0.000 title claims abstract description 185
- 238000009434 installation Methods 0.000 claims abstract description 35
- 239000000523 sample Substances 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims description 43
- 238000004891 communication Methods 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 9
- 230000002459 sustained effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 26
- 238000005507 spraying Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 19
- 238000005303 weighing Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009514 concussion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a liquid volume sensor relating to the technical field of sensors. The defect of the traditional liquid volume measuring method is overcome. A liquid flowing pipeline is arranged inside a valve body along the horizontal direction; the liquid inlet and the liquid outlet of the liquid flowing pipeline are both arranged on the side wall of the valve body; a groove which is concave downwards and vertically is arranged in the middle of the liquid flowing pipeline; the liquid inlet is communicated with a bottom outlet of a measuring barrel; an electromagnetic valve is fixed on the valve body and is used for controlling the connection or disconnection of the liquid flowing pipeline of the valve body; a sensor installation hole is arranged in the side wall of the valve body; the sensor installation hole penetrates through the side wall and is communicated with the groove in the liquid flowing pipeline; and a probe of a micro pressure sensor is embedded into the side wall of the valve body and is used for measuring a pressure signal inside the groove. According to the liquid volume sensor, a V/F (Voltage to Frequency) converter is adopted to process a measured sensor signal; and moreover, a temperature supplementary circuit is adopted for supplementing the V/F converter; and the liquid volume sensor is applicable for measuring the volume of each spraying liquid of spraying working equipment.
Description
Technical field
The application relates to sensor technical field, is specifically related to measure the sensor technical field of liquid capacity.
Background technology
Conventional container measurement method, weighing measurement conversion method and the employing flow sensor of way of existing liquid capacity metering measured this three kinds of methods.In these three kinds of methods:
1, container measurement method, is by liquid being packed in the container with scale mark, then adopts the scale that reads of eye-observation to obtain measurement result, and not only measuring accuracy is not high for this kind of method, and the state of being measured operating personnel affects very large.And this kind of liquid capacity measuring method is also not easy to be combined with existing automatic control equipment or method.
2, weighing measurement conversion method, by the apparatus measures of weighing of precision, to obtain the weight of fluid to be measured, then by mathematical measure, calculate acquisition, the weighed impact of accuracy of instrument of the measurement result of this kind of method is larger, and the density of liquid is changing according to temperature, and practical in computation process be conventional density parameter, this also can affect final measurement.In addition, while adopting this kind of method to measure liquid capacity, need to adopt container to carry out splendid attire testing liquid, this kind of mode is for needing continuous several times to measure the occasion of different liquids volume, after measuring liquid capacity at every turn, all need fluid to be measured to discharge, if adopted, container is taken off and pours out the liquid that measures volume, and then container is put back into the mode of measuring next group liquid on the instrument of weighing, again container is put into and is weighed on instrument at every turn, all need the operation of once returning to zero, cumbersome.And if the mode that adopts the structure that discharge liquid is installed on container can be avoided the defect of said method existence, but, can produce new problem again thereupon, that is: the device of discharge liquid need to extend to outside the face of weighing of the instrument of weighing, this kind of structure can affect the center of gravity of container, and then affect the precision of measuring weight, that is: can not guarantee to measure the precision of liquid capacity.
3, adopt flow sensor measuring method, the ratio of precision of this kind of method measurement is higher, but cost is also higher, and need measured liquid have certain flow velocity and a pressure stability, if mix while having bubble and all can have a strong impact on measurement result in pressure transient or liquid.
Summary of the invention
The defect that the present invention exists in order to overcome above-mentioned existing liquid capacity measuring method, has designed a kind of liquid capacity sensor being applicable to the volume accurate measurement of non-corrosive liquid.
Liquid capacity sensor of the present invention comprises metering cylinder, valve body, solenoid valve and micro-pressure sensor, in application valve body, be provided with the liquid communication pipeline of along continuous straight runs, the liquid inlet of this liquid communication pipeline and liquid outlet are all arranged on the sidewall of valve body, the centre of liquid communication pipeline is provided with recessed vertically downward groove, the liquid inlet of this valve body is communicated with the outlet at bottom of metering cylinder, solenoid valve is fixed on valve body, the on-off that is used for the liquid communication pipeline of application valve body, the probe of micro-pressure sensor embeds on the sidewall of valve body, for measuring the pressure signal in groove, between the probe of described micro-pressure sensor and body wall, seal, the liquid communication pipe of described valve body is routed into liquid section, fluid section, discharge opeing section forms, it is described that to enter liquid section mutually vertical with fluid section, and corresponding with the groove in liquid communication pipeline, the end that enters liquid section is communicated with fluid section, the top of fluid section is provided with solenoid valve installation cavity, the top of this solenoid valve installation cavity is provided with shoulder for Motionless electromagnetic valve, the bottom of this solenoid valve installation cavity is communicated with the head end of discharge opeing section, the described head end that enters liquid section is liquid inlet, the end of described discharge opeing section is liquid outlet, described solenoid valve is fixed on valve body, and the end of the distance rod of this solenoid valve extends to solenoid valve installation cavity, top for shutoff fluid section, and then cut off into liquid section and discharge opeing section, described liquid capacity sensor also comprises metering circuit, described metering circuit comprises operational amplifier, V/F transducer and temperature-compensation circuit, the pressure signal of micro-pressure sensor output sends to V/F transducer after operational amplifier amplifies, described V/F transducer output frequency signal is as the output signal of this liquid capacity sensor, temperature-compensation circuit output compensating signal is to V/F transducer.
Described liquid inlet place can be provided with screw thread, and liquid inlet and metering cylinder adopt thread connecting mode to be connected between bottom.
The top of above-mentioned fluid section can exceed the bottom of solenoid valve installation cavity, and the external diameter on the top of fluid section is less than the internal diameter of solenoid valve installation cavity, make to form annular groove between the top lateral wall of fluid section and the madial wall of solenoid valve installation cavity, in the bottom surface of this annular groove, be provided with one or more outages, described one or more outages are communicated with discharge opeing section.
On the sidewall of solenoid valve installation cavity, can also be provided with one or more side outages, these one or more side outages are communicated with discharge opeing section.
Above-mentioned one or more side outage is positioned at sustained height, and the extreme lower position of described side outage is higher than the height on the top of fluid section.
The structure of above-mentioned solenoid valve can comprise electromagnet, moving iron core, rubber blanket, spring and housing, the center of described housing is provided with the movable chamber of distance rod, described electromagnet is fixed on the top in the movable chamber of distance rod, distance rod is provided with moving iron core in movable chamber, between described moving iron core and electromagnet, be provided with spring, moving iron core is the distance rod of solenoid valve, and described moving iron core bottom end face is fixed with rubber blanket, and this rubber blanket is for the top of shutoff fluid section.
The present invention can also comprise metering circuit, described metering circuit comprises operational amplifier, V/F transducer and temperature-compensation circuit, the pressure signal of micro-pressure sensor output sends to V/F transducer after operational amplifier amplifies, described V/F transducer output frequency signal is as the output signal of this liquid capacity sensor, and temperature-compensation circuit output compensating signal is to V/F transducer.
Above-mentioned metering circuit can be fixed on the lateral wall of valve body.
The present invention can also comprise display device, and this display device is connected with the display output terminal of metering circuit by data line.
The present invention is applicable to the volume accurate measurement to non-corrosive liquid, and its measurement range can be selected the measuring method of corresponding micro-pressure sensor and the volume of metering cylinder as required.Valve body structure of the present invention is more suitable for the liquid of measuring 0 to 1 liter, and especially, when measuring the liquid of 0 to 500 ml volumes, error can be less than 1%.
The liquid that the present invention adopts metering cylinder collecting belt to measure, is applicable to the volume of each spraying liquid of the equipment of spraying operation to measure, and for example, can measure each distributive value of fuel injector.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of liquid capacity sensor of the present invention.
Fig. 2 is the principle schematic of the metering circuit described in embodiment 13.
Fig. 3 is the structural representation of the valve body 3 described in embodiment seven to ten.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 and Fig. 6 are the schematic diagram of two kinds of mounting meanss of the probe of micro-pressure sensor 1.
Fig. 7 and Fig. 8 are the schematic diagram of valve body structure described in embodiment ten flow direction in discharge opeing process.
Fig. 9 and Figure 10 are discharge opeing processes while finishing, the view of valve body 5 inner retain liquid.
Embodiment
Embodiment one: the liquid capacity sensor described in present embodiment comprises metering cylinder 7, valve body 3, solenoid valve 6 and micro-pressure sensor, in application valve body 3, be provided with the liquid communication pipeline of along continuous straight runs, the liquid inlet of this liquid communication pipeline and liquid outlet are all arranged on the sidewall of valve body 3, the centre of liquid communication pipeline is provided with vertically downward recessed groove 3-10, the liquid inlet of this valve body 3 is communicated with the outlet at bottom of metering cylinder 7, solenoid valve 6 is fixed on valve body 3, the on-off that is used for the liquid communication pipeline of application valve body 3, the probe of micro-pressure sensor 1 embeds on the sidewall of valve body 3, for measuring the pressure signal in groove, between the probe of described micro-pressure sensor 1 and body wall, seal.
The mounting means of the probe of described micro-pressure sensor 1, can on the sidewall of described valve body 3, offer an installation of sensors hole 2, this installation of sensors hole 2 is run through place sidewall and is communicated with the groove 3-10 in liquid communication pipeline, the probe of micro-pressure sensor 1 embeds in this mounting hole 2, for measuring the pressure in liquid inlet side liquid communication pipeline, sealing between the probe of described micro-pressure sensor 1 and described mounting hole 2.
In present embodiment, between the probe of described micro-pressure sensor 1 and described mounting hole 2, sealing can adopt O-ring seal to realize.
The principle of work of present embodiment is: in use, metering cylinder 7 is for collecting testing liquid, testing liquid flows in the liquid communication pipeline of valve body 3, and the micro-pressure sensor being embedded in this pipeline is measured the pressure that obtains liquid, according to this calculation of pressure, obtains fluid to be measured volume parameters.In measuring process, by solenoid valve, block the liquid communication pipeline in valve body, now, the groove 3-10 of liquid communication pipeline is communicated with liquid inlet, that is: be communicated with metering cylinder 7.When measurement is complete, by controlling solenoid valve, open liquid communication pipeline, fluid to be measured is flowed out from liquid outlet, now, in the groove 3-10 of micro-pressure sensor place, still leave liquid, that is: micro-pressure sensor is all immersed in liquid in measurement and two states to be measured, and the signal that now micro-pressure sensor is measured is initialize signal, is: testing liquid volume is zero corresponding parameter.
Embodiment two: present embodiment is the further restriction to the metering cylinder 7 in the liquid capacity sensor described in embodiment one, in present embodiment, described metering cylinder 7 is that xsect is circle, ellipse, rectangle or polygonal straight tubular construction.
Embodiment three: present embodiment is the further restriction to the metering cylinder 7 in the liquid capacity sensor described in embodiment one, in present embodiment, the bottom of described metering cylinder 7 is less than or equal to the position, the end of the liquid communication pipeline of valve body 3.
In present embodiment, when the bottom of metering cylinder 7 is lower than the position, the end of the liquid communication pipeline of valve body 3 time, be more suitable for and measure oils liquid, because sometimes, in oils liquid to be measured, contain impurity, metering cylinder 7 can be conducive to keep the clean of the interior liquid communication pipeline of valve body 3 for collecting the impurity depositing in oils liquid lower than the part of the position, the end of the liquid communication pipeline of valve body 3, and then improves the serviceable life of liquid capacity sensor.
Embodiment four: present embodiment is the further restriction to the liquid capacity sensor described in embodiment one or two any one embodiments, in present embodiment, described liquid inlet is fixedly connected with by the mode of welding with the bottom of metering cylinder 7.
Liquid inlet in present embodiment and metering cylinder 7 bottoms adopt the mode of welding to be fixedly connected with, and make to realize absolute being tightly connected between the two, and good sealing effect, contributes to improve the measuring accuracy of liquid capacity.
Embodiment five: present embodiment is the further restriction to the liquid capacity sensor described in embodiment one or two any one embodiments, in present embodiment, described liquid inlet place is provided with screw thread, between liquid inlet and metering cylinder 7 bottoms, adopts thread connecting mode to be connected.
Present embodiment is provided with screw thread at liquid inlet place, for realizing dismountable tight connection with outside.Now, this liquid inlet is directly communicated with by screw thread with the liquid outlet of metering cylinder 7 bottoms, or is realized and being connected by screwed pipe fitting.
Embodiment six: present embodiment is the further restriction to the liquid capacity sensor described in embodiment one to three any one embodiment, and in present embodiment, the test surface of the probe of described micro-pressure sensor 1 is perpendicular to surface level.
In the present invention, the test surface of the probe of described micro-pressure sensor 1 can parallel and surface level, and mounting means is referring to described in Fig. 5, that is: installation of sensors hole 2 coaxially arranges with groove 3-10, adopts this kind of mounting means, and the processing technology of valve body 3 is simple and convenient.And present embodiment adopts, be to make the test surface of probe of micro-pressure sensor 1 perpendicular to surface level, mounting means is shown in Figure 6, that is: the axis in installation of sensors hole 2 is perpendicular to the axis of groove 3-10, this kind of mounting means can effectively be avoided the compression shock vertically downward producing when liquid injects metering cylinder 7, and then effectively alleviated the impact on micro-pressure sensor 1 of the impulsive force that produces when filling liquid, improved stability and accuracy that liquid capacity is measured.
Embodiment seven: present embodiment is the further restriction to the liquid capacity sensor described in embodiment one to six any one embodiment, in present embodiment, the liquid communication pipe of described valve body 3 is routed into liquid section 3-9, fluid section 3-7, discharge opeing section 3-2 forms, it is described that to enter liquid section 3-9 mutually vertical with fluid section 3-7, and corresponding with the groove 3-10 in liquid communication pipeline, the end that enters liquid section 3-9 is communicated with fluid section 3-7, the top of fluid section 3-7 is provided with solenoid valve installation cavity 3-5, the top of this solenoid valve installation cavity 3-5 is provided with shoulder 3-4 for Motionless electromagnetic valve, the bottom of this solenoid valve installation cavity 3-5 is communicated with the head end of discharge opeing section 3-2, the described head end that enters liquid section 3-9 is liquid inlet, the end of described discharge opeing section 3-2 is liquid outlet, described solenoid valve 6 is fixed on valve body 3, and the end of the distance rod of this solenoid valve 6 extends to solenoid valve installation cavity 3-5, for the top of shutoff fluid section 3-7, and then cuts off into liquid section 3-9 and discharge opeing section 3-2.
The head end in each chamber in the liquid communication pipeline described in present embodiment and end are the flow direction definition of when measuring liquid, that is: liquid flows into end for head end, and liquid outflow end is end.
Present embodiment is provided with the concrete structure of the interior liquid communication pipeline of valve body 3, shown in Figure 2, this kind of structure is in measuring the process of liquid capacity, and flowing to of liquid is shown in Figure 1, when measurement completes, after discharging fluid to be measured, enter in liquid section 3-9, be still full of liquid in groove 3-10 and fluid section 3-7, make upper once measure before, can effectively guarantee the stability of pressure at the probe place of micro-pressure sensor, and then can obtain reliable zero data, to improve measuring accuracy; In addition, this kind of structure can also effectively guarantee when injecting testing liquid, effectively reduce the sudden change of the pressure at micro-pressure sensor probe place, and then guarantees that this place's pressure becomes the stable state rising, and improves the stability of measuring as far as possible.
Embodiment eight: present embodiment is the further restriction to the liquid capacity sensor described in embodiment seven, in present embodiment, the head end of described fluid section 3-7 exceeds the bottom of solenoid valve installation cavity 3-5, and the external diameter of fluid section 3-7 head end is less than the internal diameter of solenoid valve installation cavity 3-5, make to form annular groove 3-6 between fluid section 3-7 head end lateral wall and the madial wall of solenoid valve installation cavity 3-5, in the bottom surface of this annular groove 3-6, be provided with one or more outage 3-8, described one or more outage 3-8 are communicated with discharge opeing section 3-2.
In present embodiment, define between solenoid valve installation cavity 3-5 and discharge opeing section 3-2 and be communicated with by one or more outages, can, according to the requirement of drain age velocity, set the diameter of outage and the quantity of outage.
Embodiment nine: present embodiment is the further restriction to the liquid capacity sensor described in embodiment eight, in present embodiment, on the sidewall of solenoid valve installation cavity 3-5, be also provided with one or more side outage 3-3, these one or more side outage 3-3 are communicated with discharge opeing section 3-2.
Present embodiment has increased the side outage 3-3 of side on the basis of embodiment eight, has increased the quantity of outage, has improved the speed of discharge opeing.
Owing to adopting a plurality of a plurality of apocenosis passages discharge opeings simultaneously that outage is corresponding, liquid is discharged from a thicker pipeline, then by a plurality of thin pipe rows, locate, and then guaranteed the stability of draining flow, and then guarantee the level and smooth stable variation of the probe place pressure of micro-pressure sensor.
Embodiment ten: present embodiment is the further restriction to the liquid capacity sensor described in embodiment nine, in present embodiment, described one or more side outage 3-3 is positioned at sustained height, and the extreme lower position of described side outage 3-3 is higher than the height of the head end of fluid section 3-7.
Present embodiment further defines the height of side outage 3-3, that is: the extreme lower position of all side outage 3-3 is higher than the height of fluid section 3-7 head end, actually adding man-hour, according to the size of concrete valve body, design, is more high better in solenoid valve installation cavity 3-5 in principle.
In present embodiment, by limiting the height of side outage 3-3, realized the circulation pipeline of controlling liquid in discharge opeing process, shown in Figure 7, when starting to discharge liquid, solenoid valve is opened, liquid flow into solenoid valve installation cavity 3-5 from discharge opeing section 3-2, and by the outage 3-8 of solenoid valve installation cavity 3-5 bottom and the side outage 3-3 of side, be divided into a plurality of branch roads respectively and be drained in discharge opeing section 3-2, liquid levels speed stabilizing is reduced, and then guarantee that the probe place pressure of micro-pressure sensor 1 can uniform descent.When the liquid level of liquid is reduced under side outage 3-3, shown in Figure 8, liquid is only discharged by being positioned at the outage 3-8 of solenoid valve installation cavity 3-5 bottom, reduced drain age velocity, and then reduced the pace of change of the probe place pressure of micro-pressure sensor 1, the pressure of the probe position of micro-pressure sensor 1 is slowly reduced, until liquid level is reduced to the height of fluid section 3-7 head end, stop discharge opeing, now, the state that retains of valve body 3 internal liquids is referring to shown in Fig. 9 and Figure 10, the probe place pressure of micro-pressure sensor 1 constant, because pressure variation is above very slow, therefore this micro-pressure sensor 1 can return to steady state (SS) very soon.
Micro-pressure sensor is in the process of gaging pressure, if measured rate of pressure change is too fast, can make micro-pressure sensor in concussion state, and the time that described micro-pressure sensor need to be longer can be from the normality of this concussion replying state.If measured under earthquake state, can have a strong impact on the accuracy of measurement, therefore, as guaranteed each accuracy of measuring, just need to wait for the longer time, after treating that micro-pressure sensor returns to normality, can carry out measurement next time.
Structure described in present embodiment, can effectively control the speed of the pressure variation of micro-pressure sensor place environment in discharge opeing process, and the stage that discharge opeing finishes nearly, further reduced drain age velocity, that is: reduced rate of pressure change, actual, add man-hour, can be according to actual needs, by being set, the quantity of outage 3-8 and the quantity of side outage 3-3 controls the variation of drain age velocity, and then guarantee when the discharge opeing process that at every turn measures liquid capacity finishes, micro-pressure sensor is still in steady state (SS), and then can realize as early as possible next time and measuring accurately.Therefore, the structure described in present embodiment is more suitable in the environment that continuous several times measures and uses.
Embodiment 11: present embodiment is the further restriction to the liquid capacity sensor described in embodiment seven to ten any one embodiments, in present embodiment, described solenoid valve 6 comprises electromagnet, moving iron core 4, rubber blanket, spring 6 and housing, the center of described housing is provided with the movable chamber of distance rod, described electromagnet is fixed on the top in the movable chamber of distance rod, distance rod is provided with moving iron core 4 in movable chamber, between described moving iron core 4 and electromagnet, be provided with spring 6, moving iron core 4 is the distance rod of solenoid valve 6, described moving iron core 4 bottom end faces are fixing by rubber blanket, this rubber blanket is for the top of shutoff fluid section 3-7.
In present embodiment, specifically define the structure of solenoid valve 6, in said structure, adopt spring 6 rubber blanket to be pressed on to the top of fluid section 3-7, and then liquid can not be flow in discharge opeing section 3-2, realize the object of measuring, when measurement is complete, by controlling electromagnet, produce high-intensity magnetic field power, attract to draw on moving iron core 4, and then rubber blanket is lifted, fluid section 3-7 and discharge opeing section 3-2 are communicated with, make liquid flow into discharge opeing section from fluid section 3-7, reach the object of getting rid of metering cylinder 7 interior liquid.
When liquid capacity sensor measurement oil product described in adopting present embodiment, rubber blanket can adopt oil resistant rubber to make, and then improves the durability of rubber blanket.
Embodiment 12: present embodiment is the further restriction to the liquid capacity sensor described in embodiment 11, in present embodiment, the top of described moving iron core 4 is provided with groove, and the end of described spring 6 is embedded in groove.
Present embodiment is provided with groove at the top of moving iron core 4, be used for embedding spring 6, and then reach spacing effect, spring 6 can be remained prolong its axis direction flexible, and then control moving iron core 4 and do one dimension rectilinear motion along the axis direction of spring 6, guarantee under the pressure of spring 6, be positioned at rubber blanket and the fluid section 3-7 top close contact of moving iron core 4 ends.
In present embodiment, spring stop means can also be set in the bottom of electromagnet, and then the position of restraining spring 6 upper ends.
Embodiment 13: present embodiment is the further restriction to the liquid capacity sensor described in embodiment one to 12 any one embodiment, liquid capacity sensor described in present embodiment also comprises metering circuit, described metering circuit comprises operational amplifier 8, V/F transducer 9 and temperature-compensation circuit 10, the pressure signal of micro-pressure sensor output sends to V/F transducer 9 after operational amplifier 8 amplifies, described V/F transducer 9 output frequency signals are as the output signal of this liquid capacity sensor, temperature-compensation circuit 10 output compensating signals are to V/F transducer 9.
Present embodiment has increased metering circuit, and the structure of described metering circuit is shown in Figure 2.Described metering circuit is amplified for micro-pressure sensor is measured to the signal obtaining, and converting frequency signal to as the output signal of this liquid capacity sensor, this frequency signal can directly be exported to display for showing output or exporting to and need to these data survey the preparation uses such as computing machine.
The metering circuit that present embodiment increases can be fixed together with micro-pressure sensor, direct output frequency signal, easy to use and debugging.
Embodiment 14: present embodiment is the further restriction to the liquid capacity sensor described in embodiment 13, in present embodiment, described metering circuit is fixed on the lateral wall of valve body 3.
In present embodiment, can adopt the mode being screwed realizes, for example: two fixed orifice 3-1 can be set on the sidewall of valve body 3, by two screws, the circuit board of metering circuit is fixed on the lateral wall of valve body 3 and both can, this kind of structure can shorten the signal transmission line length of micro-pressure sensor, improved measurement accuracy and the reliability of micro-pressure sensor.
Embodiment 15: present embodiment is the further restriction to the liquid capacity sensor described in embodiment 13, in present embodiment, increased display device 11, this display device is connected with the display output terminal of metering circuit by data line.
Present embodiment has increased display device 11, and metering circuit sends to this display device 11 to show output measurement result, can in the process of measuring liquid, obtain in real time the volume of fluid to be measured.
Claims (8)
1. liquid capacity sensor, comprise metering cylinder (7), valve body (3), solenoid valve (6) and micro-pressure sensor, in valve body (3), be provided with the liquid communication pipeline of along continuous straight runs, the liquid inlet of this liquid communication pipeline and liquid outlet are all arranged on the sidewall of valve body (3), the centre of liquid communication pipeline is provided with recessed vertically downward groove (3-10), the liquid inlet of this valve body (3) is communicated with the outlet at bottom of metering cylinder (7), solenoid valve (6) is fixed on valve body (3), the on-off that is used for the liquid communication pipeline of application valve body (3), the probe of micro-pressure sensor embeds on the sidewall of valve body, for measuring the pressure signal in groove, between the probe of described micro-pressure sensor (1) and body wall, seal, it is characterized in that, the liquid communication pipe of described valve body (3) is routed into liquid section (3-9), fluid section (3-7), discharge opeing section (3-2) forms, it is described that to enter liquid section (3-9) mutually vertical with fluid section (3-7), and corresponding with the groove (3-10) in liquid communication pipeline, the end that enters liquid section (3-9) is communicated with fluid section (3-7), the top of fluid section (3-7) is provided with solenoid valve installation cavity (3-5), the top of this solenoid valve installation cavity (3-5) is provided with shoulder (3-4) for Motionless electromagnetic valve, the bottom of this solenoid valve installation cavity (3-5) is communicated with the head end of discharge opeing section (3-2), the described head end that enters liquid section (3-9) is liquid inlet, the end of described discharge opeing section (3-2) is liquid outlet, described solenoid valve (6) is fixed on valve body (3), and the end of the distance rod of this solenoid valve (6) extends to solenoid valve installation cavity (3-5), top for shutoff fluid section (3-7), and then cut off into liquid section (3-9) and discharge opeing section (3-2), described liquid capacity sensor also comprises metering circuit, described metering circuit comprises operational amplifier (8), V/F transducer (9) and temperature-compensation circuit (10), the pressure signal of micro-pressure sensor output sends to V/F transducer (9) after operational amplifier (8) amplifies, described V/F transducer (9) output frequency signal is as the output signal of this liquid capacity sensor, temperature-compensation circuit (10) output compensating signal is to V/F transducer (9).
2. liquid capacity sensor according to claim 1, is characterized in that, described liquid inlet place is provided with screw thread, and liquid inlet and metering cylinder (7) adopt thread connecting mode to be connected between bottom.
3. liquid capacity sensor according to claim 1, is characterized in that, the test surface of the probe of described micro-pressure sensor (1) is perpendicular to surface level.
4. liquid capacity sensor according to claim 1, it is characterized in that, the top of described fluid section (3-7) exceeds the bottom of solenoid valve installation cavity (3-5), and the external diameter on the top of fluid section (3-7) is less than the internal diameter of solenoid valve installation cavity (3-5), make to form annular groove (3-6) between the top lateral wall of fluid section (3-7) and the madial wall of solenoid valve installation cavity (3-5), in the bottom surface of this annular groove (3-6), be provided with one or more outages (3-8), described one or more outages (3-8) are communicated with discharge opeing section (3-2).
5. according to the liquid capacity sensor described in claim 1 or 4, it is characterized in that, on the sidewall of solenoid valve installation cavity (3-5), be also provided with one or more side outages (3-3), these one or more side outages (3-3) are communicated with discharge opeing section (3-2).
6. liquid capacity sensor according to claim 5, is characterized in that, described one or more side outages (3-3) are positioned at sustained height, and the extreme lower position of described side outage (3-3) is higher than the height on the top of fluid section (3-7).
7. liquid capacity sensor according to claim 1, it is characterized in that, described solenoid valve (6) comprises electromagnet, moving iron core (4), rubber blanket, spring (6) and housing, the center of described housing is provided with the movable chamber of distance rod, described electromagnet is fixed on the top in the movable chamber of distance rod, distance rod is provided with moving iron core (4) in movable chamber, between described moving iron core (4) and electromagnet, be provided with spring (6), moving iron core (4) is the distance rod of solenoid valve (6), described moving iron core (4) bottom end face is fixed with rubber blanket, this rubber blanket is for the top of shutoff fluid section (3-7).
8. liquid capacity sensor according to claim 1, is characterized in that, it also comprises display device (11), and this display device is connected with the display output terminal of metering circuit by data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210257483.4A CN102749118B (en) | 2012-07-24 | 2012-07-24 | Liquid volume sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210257483.4A CN102749118B (en) | 2012-07-24 | 2012-07-24 | Liquid volume sensor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2389358Y (en) * | 1999-08-31 | 2000-07-26 | 上海交通大学 | Different pressure fuel loss measurer for internal combustion engine |
| CN1580714A (en) * | 2004-05-18 | 2005-02-16 | 河南科技大学 | Flow sensor of automatic oil measurement for oil injection pump test bed |
| CN1820184A (en) * | 2003-07-10 | 2006-08-16 | Avl皮尔伯格仪器流程技术有限责任公司 | Device for measuring time-resolved volumetric throughflow processes |
| CN202648730U (en) * | 2012-07-24 | 2013-01-02 | 哈尔滨奥松机器人科技有限公司 | Liquid volume sensor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2389358Y (en) * | 1999-08-31 | 2000-07-26 | 上海交通大学 | Different pressure fuel loss measurer for internal combustion engine |
| CN1820184A (en) * | 2003-07-10 | 2006-08-16 | Avl皮尔伯格仪器流程技术有限责任公司 | Device for measuring time-resolved volumetric throughflow processes |
| CN1580714A (en) * | 2004-05-18 | 2005-02-16 | 河南科技大学 | Flow sensor of automatic oil measurement for oil injection pump test bed |
| CN202648730U (en) * | 2012-07-24 | 2013-01-02 | 哈尔滨奥松机器人科技有限公司 | Liquid volume sensor |
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