CN109764932B - Working method of built-in liquid level measuring device adopting differential pressure sensing device - Google Patents
Working method of built-in liquid level measuring device adopting differential pressure sensing device Download PDFInfo
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- CN109764932B CN109764932B CN201910109781.0A CN201910109781A CN109764932B CN 109764932 B CN109764932 B CN 109764932B CN 201910109781 A CN201910109781 A CN 201910109781A CN 109764932 B CN109764932 B CN 109764932B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/18—Indicating, recording or alarm devices actuated electrically
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Abstract
The invention relates to a working method of a built-in liquid level measuring device adopting a differential pressure sensing device, the built-in liquid level measuring device comprises the differential pressure sensing device, a ventilation balance pipe and a liquid inlet, wherein the ventilation balance pipe and the liquid inlet are respectively connected with a low-pressure input end and a high-pressure input end of the differential pressure sensing device; the liquid inlet is arranged on the bottom wall of the liquid storage tank; the differential pressure sensing device is connected with an external power supply and a controller through leads; the high-pressure input end and the low-pressure input end of the differential pressure sensing device sense the liquid depth pressure and the pressure difference of the gas pressure led in on the liquid surface, the electrical characteristics change after the pressure difference is deformed, the weak electrical signals are amplified and temperature compensation related circuits are converted into voltage or current signals which can be collected and applied, and the voltage or current signals are transmitted to an external controller through a lead to be calculated, so that the liquid level measurement is completed.
Description
Technical Field
The invention relates to the technical field of liquid level measurement, in particular to a working method of a built-in liquid level measuring device adopting a differential pressure sensing device.
Background
Both contact float tests and absolute electronic pressure sensor tests are used in liquid level detection. The contact type floater has low test precision and reliability, and cannot meet the requirement in precision test.
The absolute electronic pressure sensor test cannot accurately test the height of the liquid level when the vehicle moves to different altitudes or under a closed condition in the transportation process, and the pressure change of atmosphere or gas causes inaccuracy of the liquid level height test. Although there are cases of using two absolute pressure sensors, that is, the liquid level height with relatively accurate level is calculated by using the difference between the pressures measured by one gas pressure sensor and one liquid level absolute type electronic pressure sensor, the disadvantages of inaccuracy or unreliability, complex system, high cost, low service life and the like are caused by the precision and fault reasons in the system. According to the pressure formula in the liquid: ph = ρ gh + P0, ρ is the density of the liquid, g is the acceleration of gravity, h is the height to the liquid level measurement point within the liquid, P0 is the gas pressure at the liquid level, Ph is the pressure inside the liquid; under normal conditions, the density and the gravitational acceleration of the liquid are constant, and the height in the liquid is proportional to the pressure difference (Ph-P0).
Generally, the pressure of one atmosphere on the liquid surface is about 100kPa, while the depth of the liquid is about 10kPa when the density and the gravitational acceleration of the water-based or organic liquid are constant, and the pressure of the liquid surface is inevitably removed to be in direct proportion to the height of the liquid surface when the pressure corresponding to the depth of the liquid is precisely measured.
Chinese patent CN200710199215.0, built-in pressure taking method of differential pressure liquid level meter, disclose a liquid level detection method capable of overcoming the influence of the temperature change of steam or medium in the container on the measurement, which at least includes a liquid storage tank, a differential pressure liquid level meter, a positive phase pressure tube and a negative phase pressure tube, the positive phase pressure tube and the negative phase pressure tube are respectively connected with the positive phase end (high pressure input end) and the negative phase end (low pressure input end) of the differential pressure liquid level meter, the vertical section of the negative phase pressure tube is arranged in the container, the liquid in the container is injected in advance in the negative phase pressure tube. In practical application, the medium temperature is often changed greatly, which affects the measurement precision; when the device is used, a small section of horizontal pressure guiding pipe outside the container needs heat tracing, and the use is troublesome.
Disclosure of Invention
The invention aims to solve the technical problem of providing a built-in liquid level measuring device with simple structure, easy maintenance and high measuring precision and a working method thereof.
In order to solve the problems, the invention provides a built-in liquid level measuring device which comprises a differential pressure sensing device, a ventilation balance pipe and a liquid inlet, wherein the ventilation balance pipe and the liquid inlet are respectively connected with a low-pressure input end and a high-pressure input end of the differential pressure sensing device; the liquid inlet is arranged on the bottom wall of the liquid storage tank so that liquid to be detected enters the high-pressure input end of the differential pressure sensing device; the differential pressure sensing device is connected with an external power supply and a controller through leads and is used for providing power for the differential pressure sensing device and completing data calculation; the high-pressure input end and the low-pressure input end of the differential pressure sensing device sense the liquid depth pressure and the pressure difference of the gas pressure led in on the liquid surface, the electrical characteristics change after the pressure difference is deformed, the weak electrical signals are amplified and temperature compensation related circuits are converted into voltage or current signals which can be collected and applied, and the voltage or current signals are transmitted to an external controller through a lead to be calculated, so that the liquid level measurement is completed.
The differential pressure sensing device comprises a circuit board and a differential pressure sensor chip, a through hole is formed in the center of the circuit board, the circuit board is connected with an external power supply and a controller through a wire, the differential pressure sensor chip is fixedly arranged below the circuit board and provided with a corresponding upper side and a lower side, the upper side of the differential pressure sensor chip is a low-voltage input end of the differential pressure sensing device, the ventilation balance pipe penetrates through the through hole of the circuit board and is connected with the low-voltage input end, and the lower side of the differential pressure sensor chip is connected with the liquid inlet through a high-voltage input end so that filtered liquid to be detected directly enters the high-voltage input end of the differential pressure.
Furthermore, a corrugated diaphragm is arranged below the differential pressure sensor chip and welded on the shell; a sealed cavity is formed between the circuit board and the corrugated diaphragm, silicone oil capable of conducting pressure is filled in the sealed cavity, and the lower side of the differential pressure sensor chip is in contact with the silicone oil; the lower side of the corrugated diaphragm is used as a high-pressure input end of the differential pressure sensing device and is connected with the liquid inlet, and liquid is conducted to the lower side of the differential pressure sensor chip through the corrugated diaphragm and silicon oil.
Further, the differential pressure sensor chip is at least one of a mechanical pressure sensor chip, an elastic diaphragm pressure sensor chip, a semiconductor silicon pressure sensor chip, a ceramic capacitance pressure sensor chip, a diaphragm capacitance pressure sensor chip and a ceramic piezoelectric pressure sensor chip.
Further, a mounting seat is arranged in the liquid storage tank and used for fixing the differential pressure sensing device.
Further, the mounting seat is arranged above the bottom wall of the liquid storage tank through a mounting support, the mounting support is perpendicular to the top surface of the liquid, and the conducting wire and the ventilation balance pipe are fixed on the mounting support and convenient to mount.
Further, the inlet is equipped with the filter screen, prevents that the foreign matter from blockking up the inlet, influences the measuring result.
Furthermore, the air inlet of the ventilation balance pipe is provided with a filtering membrane device which can only pass through gas molecules and prevent liquid molecules from entering, so that the influence on the measurement result caused by the liquid entering into the ventilation balance pipe is prevented.
The working method of the built-in liquid level measuring device comprises the following steps:
A. one end of a lead and one end of a ventilation balance pipe are respectively connected with a circuit board and a low-voltage input end of the differential pressure sensing device in a sealing mode through sealant, and the other end of the lead is connected with an external power supply and a controller; and connecting the liquid inlet with a high-pressure input end of a differential pressure sensing device.
B. And fixing the differential pressure sensing device in the mounting seat, fixedly connecting the mounting seat with the mounting bracket, and fixing the lead and the ventilation balance pipe on the mounting bracket.
C. Placing the fixed mounting base into a liquid storage tank filled with liquid to be detected, wherein the other end of the ventilation balance pipe is used as an air inlet and is higher than the top surface of the liquid in the liquid storage tank; the gas pressure above the liquid level is led into the low-pressure input end on the upper side of the differential pressure sensing device through the gas inlet by the ventilation balance pipe, the liquid depth pressure at the bottom of the liquid storage tank is led into the high-pressure input end on the lower side of the differential pressure sensing device through the liquid inlet, the differential pressure sensor chip of the differential pressure sensing device is deformed after sensing the pressure difference between the high-pressure input end and the low-pressure input end, the electrical characteristics of the differential pressure sensor chip are changed, weak electric signals are amplified through the circuit board and converted into voltage or current signals which can be collected and applied after temperature compensation, and the voltage or current signals are transmitted to an external controller through.
The invention has the technical effects that: (1) compared with the prior art, the built-in liquid level measuring device has the advantages that the differential pressure sensing device is arranged inside the liquid in the liquid storage tank, so that the differential pressure sensing device is positioned in the measured liquid, the defect of error caused by different temperatures is avoided, and the measuring precision is greatly improved; (2) the air inlet of the ventilation balance pipe is provided with a filtering membrane device which can only pass through gas molecules and prevent liquid molecules from entering, so that the ventilation balance pipe is better protected from directly entering liquid, or liquid is gathered in the ventilation balance pipe due to evaporation cooling of the liquid, and the ventilation balance pipe cannot enter the liquid to guarantee the measurement accuracy; (3) the differential pressure sensing device is arranged in the liquid storage tank through the mounting base and the mounting bracket, so that the installation is convenient, and the application range is wide.
Drawings
The invention is described in further detail below with reference to the drawings of the specification:
FIG. 1 is a schematic structural view of a built-in level measuring device according to embodiment 1 of the present invention;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
fig. 3 is a schematic structural view of a differential pressure sensing apparatus according to embodiment 2 of the present invention.
In the figure: the liquid storage tank comprises a liquid storage tank 1, liquid 2, a liquid expansion space 3, a differential pressure sensing device 4, a low-voltage input end 41, a high-voltage input end 42, a filter screen 43, a shell 44, sealant 45, a circuit board 46, a differential pressure sensor chip 47, silicon oil 48, a corrugated diaphragm 49, a ventilation balance pipe 5, a lead 6, a mounting seat 7, a mounting support 8 and a liquid inlet 9.
Detailed Description
Example 1
As shown in fig. 1 to 2, the built-in liquid level measuring device of the present embodiment includes a liquid storage tank 1 and a differential pressure sensing device 4, a certain amount of liquid 2 (which may be gasoline, diesel oil, water, alcohol, etc.) to be monitored with a known density is filled in the liquid storage tank 1, a certain liquid expansion space 3 is reserved in the liquid storage tank 1, the differential pressure sensing device 4 includes a circuit board 46, a through hole is arranged at the center of the circuit board 46, the circuit board 46 is connected with an external power supply and a controller through a wire 6, a differential pressure sensor chip 47 (which may be a mechanical pressure sensor chip, an elastic diaphragm pressure sensor chip, a semiconductor silicon pressure sensor chip, a ceramic capacitive pressure sensor chip, a diaphragm capacitive pressure sensor chip, a ceramic piezoelectric pressure sensor chip, etc.) is fixedly arranged below the circuit board 46, the differential pressure sensor chip 47 has corresponding upper and lower sides, the upper side is used as the low pressure input end 41 of the differential pressure sensing device, the ventilation balance pipe 5 is connected with the low pressure input end 41 through the through hole of the circuit board 46, the lower side of the differential pressure sensor chip 47 is used as the liquid inlet 9 of the differential pressure sensing device 4, and the high pressure input end 42 is connected with the liquid inlet pipe.
The differential pressure sensing device 4 is fixedly arranged at the bottom of the liquid 2 in the liquid storage tank 1 through the mounting seat 7, the low-pressure input end 41 of the differential pressure sensing device 4 is connected with the ventilation balance pipe 5, and the air inlet of the ventilation balance pipe 5 is higher than the top surface of the liquid 2 in the liquid storage tank 1 and is used for transmitting the air pressure of the surface of the liquid to be measured; the air inlet is provided with a filtering membrane device which can only pass through gas molecules to prevent liquid molecules from entering and prevent liquid from entering the ventilation balance pipe.
The liquid inlet 9 is provided with a filter screen 43 to prevent foreign matters from blocking the liquid inlet 9; the lead 6 is composed of a power line, a ground wire and a signal wire, and the differential pressure sensing device 4 is connected with an external power supply and a controller through the lead 6; the mounting seat 7 is fixed through a vertically arranged mounting bracket 8, and the lead 6 and the ventilation balance pipe 5 are fixed on the mounting bracket 8.
Example 2
On the basis of the above embodiment, the present embodiment is different from embodiment 1 in that the differential pressure sensing device 4 further includes a cylindrical housing 44, a circuit board 46 is welded and mounted in the middle of the cylindrical housing 44, and the circuit board 46, the lead 6 and the ventilation balance tube 5 are sealed by using a sealant 45; a corrugated diaphragm 49 is arranged below the differential pressure sensor chip 47, and the corrugated diaphragm 49 is welded to the housing 44; a sealed cavity is formed between the circuit board 46 and the corrugated diaphragm 49, and the sealed cavity is filled with silicon oil 48 capable of conducting pressure; the lower side of the differential pressure sensor chip 47 is in contact with silicone oil 48; the lower side of the corrugated diaphragm 49 is used as a high-pressure input end of the differential pressure sensing device and is connected with the liquid inlet 9; the liquid is transmitted to the high-pressure input end 42 on the lower side of the bellows diaphragm 49 through the liquid inlet 9, and is conducted to the lower side of the differential pressure sensor chip 47 through the bellows diaphragm 49 and the silicon oil 48.
The working method of the built-in liquid level measuring device comprises the following steps:
A. one end of a lead 6 and one end of a ventilation balance pipe 5 are respectively connected with a circuit board 46 and a low-voltage input end 41 of the differential pressure sensing device 4 in a sealing way by adopting a sealant 45, and the other end of the lead 6 is connected with an external power supply and a controller; the loading port 9 is connected to a high-pressure input 42 of the differential pressure sensing device 4.
B. The differential pressure sensing device 4 is fixed in the mounting seat 7, the mounting seat 7 is fixedly connected with the mounting bracket 8, and the lead 6 and the ventilation balance pipe 5 are also fixed on the mounting bracket 8.
C. The fixed mounting seat 7 is placed into a liquid storage tank 1 filled with liquid to be detected, and the other end of the ventilation balance pipe 5 is used as an air inlet and is higher than the top surface of the liquid 2 in the liquid storage tank 1; the air-permeable balancing pipe 5 guides the gas pressure above the liquid level into the low-pressure input end 41 at the upper side of the differential pressure sensing device 4 through the air inlet, guides the liquid depth pressure at the bottom of the liquid storage tank 1 into the high-pressure input end 42 at the lower side of the differential pressure sensing device 4 through the liquid inlet 9, the differential pressure sensor chip 47 of the differential pressure sensing device 4 deforms after sensing the pressure difference between the high-pressure input end 42 and the low-pressure input end 41, the electrical characteristics of the differential pressure sensor chip change, weak electrical signals are amplified and temperature compensated through the circuit board 46 and then converted into voltage or current signals which can be collected and applied, and the voltage or current signals are transmitted to an external controller through the.
According to the built-in liquid level measuring device, the differential pressure sensing device is arranged inside the liquid in the liquid storage tank, and is positioned in the measured liquid, so that the defect of error caused by different temperatures is avoided, and the measuring precision is greatly improved; the liquid level sensor can be widely applied to liquid level measurement of an oil tank, an engine water tank liquid level, an oil truck and the like of a vehicle, or heating or non-heating open or closed tank bodies, and can realize real-time monitoring of the liquid level height.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (7)
1. A method of operating a built-in level measurement device, the level measurement device comprising: the device is characterized in that the differential pressure sensing device (4) is arranged at the bottom of liquid (2) in the liquid storage tank (1), and an air inlet of the ventilation balancing pipe (5) is higher than the top surface of the liquid (2) in the liquid storage tank (1); the liquid inlet (9) is arranged on the bottom wall of the liquid storage tank (1) so that liquid to be detected enters a high-pressure input end (42) of the differential pressure sensing device (4); the differential pressure sensing device (4) is connected with an external power supply and a controller through a lead (6);
the differential pressure sensing device (4) comprises a circuit board (46) and a differential pressure sensor chip (47), a through hole is formed in the center of the circuit board (46), the circuit board (46) is connected with an external power supply and a controller through a lead (6), the differential pressure sensor chip (47) is fixedly arranged below the circuit board (46), the differential pressure sensor chip (47) is provided with a corresponding upper side and a corresponding lower side, the upper side of the differential pressure sensor chip is a low-voltage input end (41) of the differential pressure sensing device (4), the ventilation balance pipe (5) penetrates through the through hole of the circuit board (46) to be connected with the low-voltage input end (41), the lower side of the differential pressure sensor chip (47) is a high-voltage input end (42) to be connected with the liquid inlet (9), so that liquid (2) to be measured enters the high-voltage input end (42) of the;
an installation seat (7) used for fixing the differential pressure sensing device (4) is arranged in the liquid storage tank (1), and the installation seat (7) is arranged above the bottom wall of the liquid storage tank (1) through an installation support (8); the differential pressure sensing device is arranged at the bottom of the liquid in the liquid storage tank; the mounting bracket is vertical to the top surface of the liquid, and the ventilation balance pipe is fixed on the mounting bracket;
the mounting bracket (8) is perpendicular to the top surface of the liquid (2), and the lead (6) and the ventilation balance pipe (5) are fixed on the mounting bracket (8);
the working method comprises the following steps:
A. one end of a lead (6) and one end of a ventilation balance pipe (5) are respectively connected with a circuit board (46) and a low-voltage input end (41) of a differential pressure sensing device (4) in a sealing mode through a sealant (45), and the other end of the lead (6) is connected with an external power supply and a controller; the liquid inlet (9) is connected with a high-pressure input end (42) of a differential pressure sensing device (4);
B. fixing a differential pressure sensing device (4) in an installation seat (7), fixedly connecting the installation seat (7) with an installation support (8), and fixing a lead (6) and a ventilation balance pipe (5) on the installation support (8) in the same way;
C. the fixed mounting seat (7) is placed in a liquid storage tank (1) filled with liquid (2) to be detected, and the other end of the ventilation balance pipe (5) is arranged to be higher than the top surface of the liquid (2) in the liquid storage tank (1) as an air inlet; the air-permeable balancing pipe (5) leads the gas pressure above the liquid level into a low-pressure input end (41) at the upper side of the differential pressure sensing device (4) through an air inlet, leads the liquid depth pressure at the bottom of the liquid storage tank (1) into a high-pressure input end (42) at the lower side of the differential pressure sensing device (4) through a liquid inlet (9), a differential pressure sensor chip (47) of the differential pressure sensing device (4) senses the pressure difference between the high-pressure input end (42) and the low-pressure input end (41) and then deforms, the electrical characteristics of the differential pressure sensor chip change, weak electrical signals are amplified and temperature compensated through a circuit board (46) and then converted into voltage or current signals which can be collected and applied, and the voltage or current signals are transmitted to an external controller through a lead;
the air inlet of the ventilation balance pipe (5) is provided with a filtering membrane device which can only pass through gas molecules and prevent liquid molecules from entering.
2. Working method according to claim 1, characterized in that the air inlet of the liquid inlet (9) is provided with a sieve (43).
3. The method of operation of claim 1, wherein the differential pressure sensor die is a mechanical pressure sensor die.
4. The method of operation of claim 1 wherein said differential pressure sensor die is an elastic diaphragm pressure sensor die.
5. The method of operation of claim 1, wherein the differential pressure sensor die is a semiconductor silicon pressure sensor die.
6. The method of operation of claim 1, wherein the differential pressure sensor die is a ceramic capacitive pressure sensor die.
7. The method of operation of claim 1, wherein the differential pressure sensor die is a diaphragm capacitive pressure sensor die.
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| CN201910109781.0A CN109764932B (en) | 2016-01-15 | 2016-01-15 | Working method of built-in liquid level measuring device adopting differential pressure sensing device |
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| CN201910109781.0A CN109764932B (en) | 2016-01-15 | 2016-01-15 | Working method of built-in liquid level measuring device adopting differential pressure sensing device |
| CN201610028612.0A CN105486376B (en) | 2016-01-15 | 2016-01-15 | A kind of built-in liquid level emasuring device and its working method |
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| CN201610028612.0A Division CN105486376B (en) | 2016-01-15 | 2016-01-15 | A kind of built-in liquid level emasuring device and its working method |
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| CN201910109781.0A Active CN109764932B (en) | 2016-01-15 | 2016-01-15 | Working method of built-in liquid level measuring device adopting differential pressure sensing device |
| CN201910109782.5A Active CN109764933B (en) | 2016-01-15 | 2016-01-15 | Differential pressure sensing device and liquid level measuring device formed by same |
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| CN113091994B (en) * | 2021-04-12 | 2021-11-09 | 成都皓瀚完井岩电科技有限公司 | High static pressure differential pressure transducer |
| CN117963370B (en) * | 2024-03-29 | 2024-06-18 | 四川惠科达仪表制造有限公司 | Multifunctional liquid level meter |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109764932A (en) | 2019-05-17 |
| CN105486376B (en) | 2019-01-29 |
| CN109764933B (en) | 2020-11-27 |
| CN109764933A (en) | 2019-05-17 |
| CN105486376A (en) | 2016-04-13 |
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