CN111637946A - Method and device for measuring volume of concentrated solution of stirring liquid tank by using single liquid level meter - Google Patents
Method and device for measuring volume of concentrated solution of stirring liquid tank by using single liquid level meter Download PDFInfo
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- CN111637946A CN111637946A CN202010340343.8A CN202010340343A CN111637946A CN 111637946 A CN111637946 A CN 111637946A CN 202010340343 A CN202010340343 A CN 202010340343A CN 111637946 A CN111637946 A CN 111637946A
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- liquid level
- level meter
- tank body
- tank
- volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2116—Volume
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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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
Abstract
The application relates to a method for measuring the volume of a concentrated solution of a stirring liquid tank by using a single liquid level meter, wherein the top of a tank body is provided with the radar liquid level meter, the measurement angle of the radar liquid level meter is alpha, the transverse distance between the radar liquid level meter and the axis of the tank body is X, and the vertical distance between the radar liquid level meter and the bottom surface of the tank body is H; measuring the distance of the liquid level in the tank body by using a radar liquid level meter, judging whether the liquid level is lower than the blade height of the stirring paddle, if the measured signal contains discontinuous signals which appear in fixed periods, judging that the liquid level is lower than the blade height of the stirring paddle, wherein the signal is a signal reflected by the blade of the stirring paddle, and removing the signal from records; screening out a liquid level peak signal and a liquid level minimum signal measured by a radar liquid level meter, establishing a coordinate system by taking the axis of the tank body and the longitudinal section where the radar liquid level meter is located as a plane, recording the coordinates of the two points, fitting a parabola analytical formula of the longitudinal section on the surface of the liquid level, and calculating the volume V of the liquid in the tank body.
Description
Technical Field
The application belongs to the technical field of concentrators, and particularly relates to a method for measuring the volume of a concentrated solution of a stirring solution tank by using a single liquid level meter.
Background
Among the prior art, be equipped with rotatory oar in the concentrate stirring fluid reservoir, when needs use the level gauge to measure jar interior liquid level, because the rotation of rotatory oar, the liquid level has undulant, and rotatory oar itself also influences the response of multiple sensor moreover, produces error signal easily. Take the following level gauges as an example:
1) an ultrasonic liquid level meter: the scraper concentrating tank is used for concentrating under negative pressure, and cannot be used in a concentrated solution stirring liquid tank because an ultrasonic liquid level meter cannot be used;
2) a liquid level switch: such as tuning fork liquid level switch, capacitance type liquid level switch, etc., because the scraper concentrating tank is jacketed and the rotating paddle is extremely close to the tank wall, the tank body can not be opened with holes, and the only place where the holes can be opened is at the bottom, thus the scraper concentrating tank can not be used in the concentrated solution stirring tank;
3) magnetic float level meter: when the scraper concentrating tank is used for concentrating liquid medicine, the rotating paddle is arranged and is extremely close to the tank wall, so that the scraper concentrating tank cannot be used in a concentrated liquid stirring tank;
4) differential pressure type liquid level meter: when the scraper is used for concentration, the density of the liquid medicine is continuously changed, and the density cannot be determined, and the differential pressure type liquid level meter cannot convert the volume according to the pressure and the density, so that the differential pressure type liquid level meter cannot be used in a concentrated liquid stirring liquid tank;
5) u type bypass level gauge: a U-shaped bypass tank is made by opening a hole from the bottom, such as a magnetic turning plate liquid level meter and the like, because the tank wall of the scraper concentration tank cannot be opened with the hole and only can be opened with the hole from the bottom, the installation, the cleaning and the verification are problems;
6) ray liquid level meter: the rays themselves can harm human health, are not suitable for common areas, and are expensive, so the rays cannot be used in a concentrated solution stirring liquid tank.
7) Radar level gauge: the key point is the position where the scraper rotating paddle stops, and if the scraper rotating paddle just stops under the radar liquid level meter, the scraper rotating paddle can read error signals. Because the rotatory oar is static this moment, if the rotatory oar berthhed under radar level gauge switch, the radar level gauge can't discern whether this signal is rotatory oar or liquid level, also can not realize through shielding, if shielding will lead to radar level gauge output error signal. This solution can be applied if the position of the blade rotation paddle is addressed or eliminated.
8) Two radar level gauges of angle installation stagger: adopt two radar level gauges of rotatory oar two blade angle installations that stagger, just to covering rotatory oar when the radar cover surface, can select the liquid level low, nevertheless need the trompil in addition, and the cost is expensive one time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the device for measuring the volume of the concentrated solution of the stirring solution tank by using the single liquid level meter are provided for solving the problem that the volume of the solution in the solution tank in the stirring state is difficult to measure by using the single liquid level meter in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for measuring the volume of concentrated solution of a stirring tank by a single liquid level meter comprises the following steps:
step one, arranging a radar liquid level meter at the top of a tank body, wherein the angle measurement of the radar liquid level meter is alpha, the transverse distance between the radar liquid level meter and the axis of the tank body is X, and the vertical distance between the radar liquid level meter and the bottom surface of the tank body is H;
measuring the distance of the liquid level in the tank body by using a radar liquid level meter, judging whether the liquid level is lower than the blade height of the stirring paddle, if the measured signal contains discontinuous signals which appear in fixed periods, judging that the liquid level is lower than the blade height of the stirring paddle, wherein the signal is a signal reflected by the blade of the stirring paddle, and removing the signal from records;
screening out a liquid level highest point signal and a liquid level lowest point signal measured by the radar liquid level meter, and recording the distance L between the measured liquid level highest point signal and the measured liquid level lowest point signal1And the distance from the highest point of the liquid level is L2；
Step four, establishing a coordinate system by taking the axis of the tank body and the longitudinal section where the radar liquid level meter is located as a plane, taking the axis of the tank body as a y axis, and measuring L1、L2Fitting a parabolic analytic expression of the longitudinal section of the liquid surface, and calculating the volume V of the liquid in the tank body.
Preferably, in the method for measuring the volume of the concentrated solution of the stirring tank by using the single level meter, in the fourth step, the volume V of the liquid in the tank body is calculated by using integral.
Preferably, in the fourth step, the method for measuring the volume of the concentrated solution of the stirred tank by using the single level meter firstly calculates the longitudinal section area S of the liquid in the tank body by using the integral, and then calculates the volume V.
Preferably, in the method for measuring the volume of the concentrated solution of the stirring tank by using the single liquid level meter, in the step one, the radar liquid level meter is arranged at a certain distance from the side wall of the tank body, so that the side wall of the tank body cannot be sensed.
Preferably, in the method for measuring the volume of the concentrated solution in the stirring tank by using the single liquid level meter, in the second step, the stirring paddle rotates continuously at a constant speed, and the distance between the liquid level and the liquid level is measured when the tank body is discharged temporarily.
Preferably, the method of the present invention for measuring the volume of the concentrate of the stirred tank with a single level meter, in step four, if L1＝L2If the liquid level is a plane, the liquid volume V is directly calculated.
A device for measuring the volume of a stirred tank concentrate with a single level meter, comprising:
the tank body is in a shape of a solid of revolution;
the stirring paddle is arranged at the axis position of the tank body;
and the radar liquid level meter is arranged at the top of the tank body.
The invention has the beneficial effects that: the liquid level meter can eliminate the interference of the stirring paddle during stirring, record the distance between the measured liquid level and the highest point and the distance between the measured liquid level and the lowest point by screening out a signal of the highest point and a signal of the lowest point of the liquid level measured by the radar liquid level meter, fit a parabola analytic expression of the longitudinal section of the liquid level surface, and calculate the volume of the liquid in the tank body.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic structural diagram of a device for measuring the volume of a concentrated solution of a stirring solution tank by using a single liquid level meter according to an embodiment of the application;
FIG. 2 is a schematic view of a measured numerical coordinate system of a radar level gauge with a paddle below the liquid level in an embodiment of the present application;
FIG. 3 is a schematic view of a radar level gauge measurement with a paddle above the liquid level in an embodiment of the present application;
FIG. 4 is a schematic view of a radar level gauge measurement value in a state at a liquid level according to an embodiment of the present application.
The reference numbers in the figures are:
a tank body 1;
a stirring paddle 2;
a radar level gauge 3.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Examples
The embodiment provides a device for measuring the volume of a concentrated solution in a stirring solution tank by a single liquid level meter, as shown in fig. 1, comprising:
the tank body 1 is in a shape of a solid;
the stirring paddle 2 is arranged at the axis position of the tank body 1;
and the radar liquid level meter 3 is arranged at the top of the tank body 1.
When the stirring paddle 2 is rotated stably, the liquid level of the inner concentrated solution becomes a paraboloid (the longitudinal section is a parabola).
The embodiment provides a method for measuring the volume of a concentrated solution of a stirring solution tank by using a single liquid level meter, which comprises the following steps:
step one, arranging a radar liquid level meter 3 at the top of a tank body 1, wherein the angle measurement of the radar liquid level meter 3 is alpha, the transverse distance between the radar liquid level meter 3 and the axis of the tank body 1 is X, and the vertical distance between the radar liquid level meter 3 and the bottom surface of the tank body 1 is H;
step two, measuring the distance of the liquid level in the tank body 1 by using a radar liquid level meter 3, judging whether the liquid level is lower than the blade height of the stirring paddle, if the measured signal contains discontinuous signals which appear in fixed periods, judging that the liquid level is lower than the blade height of the stirring paddle, wherein the signal is a signal reflected by the blade of the stirring paddle, and removing the signal from records;
thirdly, screening out a liquid level highest point signal and a liquid level lowest point signal measured by the radar liquid level meter 3, and recording the distance L between the measured liquid level highest point signal and the measured liquid level lowest point signal1And the distance from the highest point of the liquid level is L2；
Step four, establishing a coordinate system by taking the axis of the tank body 1 and the longitudinal section where the radar liquid level meter 3 is positioned as a plane, taking the axis of the tank body 1 as a y axis, and measuring L1、L2Fitting a parabolic analytic expression of the longitudinal section of the liquid surface, and calculating the volume V of the liquid in the tank body 1.
In the parabola analysis formula, b is 0 since the axis of symmetry of the parabola is the y-axis.
As shown in FIG. 2, the distance L between the radar level gauge 3 and the lowest point m of the liquid level1And the distance from the highest point n of the liquid level is L2According to the angle measurement of the radar liquid level meter 3 of α, the coordinates of m and n points can be obtained
Substituted y ═ ax2The + bx + c can obtain the values of the constants a and c, namely, a parabolic analytical formula of the longitudinal section of the liquid surface, and then the volume V of the liquid in the tank body 1 is calculated by using an analytical geometric method.
As shown in fig. 3, when the liquid level is just below the paddle 2, the liquid still rotates, the liquid level still has a parabolic shape, and the radar level gauge when the paddle is above the liquid level measures that m and n points still conform to the parabolic shape, so that y-ax can be substituted2+ bx + c gives a parabolic analytical expression of the longitudinal section of the liquid surface.
As shown in FIG. 4, when the liquid level does not rotate any more to form a horizontal plane, and the distance between the m point and the n point measured by the radar liquid level meter is the same, the liquid level is judged to be a plane, and the volume V of the liquid is directly calculated.
Preferably, in the method for measuring the volume of the concentrated solution of the stirring tank by using the single level meter in the embodiment, in the fourth step, the volume V of the liquid in the tank body 1 is calculated by using integration.
Preferably, in the method for measuring the volume of the concentrated solution of the stirred tank by using the single level meter according to the embodiment, in the fourth step, the longitudinal section area S of the liquid in the tank body 1 is calculated by using the integral, and then the volume V is calculated.
Preferably, in the method for measuring the volume of the concentrated solution of the stirring tank by using the single liquid level meter in the embodiment, in the step one, the radar liquid level meter 3 is arranged at a certain distance from the side wall of the tank body 1, so that the side wall of the tank body 1 cannot be sensed.
Preferably, the method for measuring the volume of the concentrated solution of the stirring solution tank by using the single level meter of the embodiment,
in the second step, the stirring paddle 2 rotates continuously at a constant speed, and the liquid level distance is measured when the tank body 1 is discharged temporarily. The suspension of the discharge of the concentrated solution can avoid the change of the liquid level, which makes the curve fitting of the longitudinal section of the liquid level difficult.
Preferably, the method for measuring the volume of the concentrated solution of the stirring tank by using the single level meter in the fourth step if L1＝L2If the liquid level is a plane, the liquid volume V is directly calculated.
In this embodiment, the radar level gauge has the following advantages:
firstly, the liquid level meter is directly installed at the top of the tank body without additionally forming a hole;
the liquid level meter is in a non-contact type and is not contacted with the liquid medicine, so that the chemical corrosion is reduced;
the negative pressure, the water vapor and the temperature are not influenced;
fourthly, the change of the liquid level volume can be continuously monitored;
the precision is high, and the static state can reach +/-2 mm;
and the coverage angle is small, so that a plurality of obstacles can be avoided.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A method for measuring the volume of concentrated solution of a stirring tank by a single liquid level meter is characterized by comprising the following steps:
the method comprises the following steps that firstly, a radar liquid level meter (3) is arranged at the top of a tank body (1), the angle measurement of the radar liquid level meter (3) is alpha, the transverse distance between the radar liquid level meter (3) and the axis of the tank body (1) is X, and the vertical distance between the radar liquid level meter (3) and the bottom surface of the tank body (1) is H;
step two, measuring the distance of the liquid level in the tank body (1) by using a radar liquid level meter (3), judging whether the liquid level is lower than the blade height of the stirring paddle, if the measured signal contains discontinuous signals which appear in a fixed period, judging that the liquid level is lower than the blade height of the stirring paddle, wherein the signal is a signal reflected by the blade of the stirring paddle, and removing the signal from a record;
thirdly, screening out a liquid level highest point signal and a liquid level lowest point signal measured by the radar liquid level meter (3), and recording the distance L between the measured liquid level highest point signal and the measured liquid level lowest point signal1And the distance from the highest point of the liquid level is L2；
Step four, establishing a coordinate system by taking the axis of the tank body (1) and the longitudinal section where the radar liquid level meter (3) is located as a plane, taking the axis of the tank body (1) as a y-axis, and measuring L through the axis1、L2Fitting a parabolic analytic expression of the longitudinal section of the liquid surface, and calculating the volume V of the liquid in the tank body (1).
2. The method for measuring the volume of the concentrated solution of the stirring liquid tank by the single liquid level meter as claimed in claim 1, wherein in the fourth step, the volume V of the liquid in the tank body (1) is calculated by integration.
3. The method for measuring the volume of the concentrated solution of the stirring tank by using the single liquid level meter as claimed in claim 2, wherein in the fourth step, the longitudinal section area S of the liquid in the tank body (1) is calculated by using integral, and then the volume V is calculated.
4. A method for measuring the volume of a stirred tank concentrate with a single level meter according to any of claims 1-3, characterized in that in step one a radar level meter (3) is placed at a distance from the side wall of the tank (1) so that the side wall of the tank (1) is not sensed.
5. A method for measuring the volume of a concentrate of a stirring tank by a single liquid level meter according to any one of claims 1-3, characterized in that in the second step, the stirring paddle (2) is continuously rotated at a constant speed, and the liquid level distance is measured when the tank (1) is stopped discharging.
6. The method for measuring the volume of the concentrated solution of the stirring tank by using the single liquid level meter as claimed in any one of claims 1 to 5, wherein in the fourth step, if L is1＝L2If the liquid level is a plane, the liquid volume V is directly calculated.
7. The utility model provides a device that single level gauge measured stirring fluid reservoir concentrate volume which characterized in that includes:
the tank body (1) is in a shape of a solid of revolution;
the stirring paddle (2) is arranged at the axis position of the tank body (1);
and the radar liquid level meter (3) is arranged at the top of the tank body (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010340343.8A CN111637946B (en) | 2020-04-26 | 2020-04-26 | Method and device for measuring volume of concentrated solution of stirring liquid tank by using single liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010340343.8A CN111637946B (en) | 2020-04-26 | 2020-04-26 | Method and device for measuring volume of concentrated solution of stirring liquid tank by using single liquid level meter |
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| CN111637946A true CN111637946A (en) | 2020-09-08 |
| CN111637946B CN111637946B (en) | 2022-03-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114225812A (en) * | 2022-02-24 | 2022-03-25 | 长沙大禹建材科技有限公司 | Mixing tank for producing building waterproof materials and liquid level measuring device thereof |
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