CN111256778A - Air wave liquid level meter - Google Patents

Abstract

The application relates to the instrument and meter field, especially a gas wave level gauge, the gas wave level gauge includes: the horn mouth of the air wave horn cylinder is provided with a high arc line notch; one end of the wave guide rod is connected with the horn tail end of the gas wave horn cylinder; the instrument is connected with the other end of the wave guide rod through an instrument joint so that a gas wave core body in the instrument collects a liquid level reference signal in the gas wave horn cylinder; and the power transmission circuit is arranged in the instrument and is connected with the air wave core body so as to convert the liquid level reference signal acquired by the air wave core body into a liquid level value. The gas wave liquid level meter can improve the accuracy of liquid level measurement.

Description

Air wave liquid level meter

Technical Field

The application relates to the technical field of electrical instruments and meters, in particular to a gas wave liquid level meter.

Background

For the measurement of the liquid level of high-viscosity media such as crude petroleum, syrup and other open containers drilled and produced, the petroleum and chemical industry commonly adopts a blowing liquid level meter for measurement and monitoring. The blowing liquid level meter utilizes the statics principle, forms certain pressure difference through different pressures of the positive pressure side and the negative pressure side of the differential pressure transmitter, and realizes the measurement of the liquid level through the differential pressure converter.

Static liquid at any height can generate pressure to the unit area of the bottom under the action of gravity. The unit pressure p is related to the liquid height h and the density rho:

p＝p0+ρ.g.h (1)

wherein p0 denotes the liquid surface air pressure, g denotes the acceleration of gravity

Equation (1) shows that the pressure p inside a static liquid varies in linear proportion with the liquid height h.

The blowing level gauge is composed of a differential pressure transducer/pressure gauge, pressure transmission pressure pipes (positive side and negative side pressure pipes), and a blowing duct, as shown in fig. 1, and fig. 1 is a schematic view of the blowing level gauge in an embodiment of the conventional art. And the liquid level is measured and monitored through the change of differential pressure.

The negative pressure side capillary conduit is arranged at the tank opening to collect the liquid level air pressure. Due to the temperature difference, pressure difference and other factors in the medium, bubbles are often generated on the surface of the mucilage. When a large amount of medium bubbles are gathered in the negative pressure side pipe, the liquid level false image can be caused, and the normal collection of the negative pressure side pressure is directly influenced. Along with the change of bubbles in the pipe, the measurement value fluctuates greatly, and the fluctuation is high and low, so that the production is dangerous, and the production efficiency is influenced.

When the outside air temperature is low, the bubbles containing liquid and gas such as water vapor can generate condensation, and the outer wall of the tube can also generate condensation. The condensate flows down along the pipe, and the condensate freezes to block the air duct when the temperature is too low, so that the liquid level meter cannot work. In severe cases, liquid may enter the converter, which will cause the converter circuit to fail, freeze and damage, and the instrument cannot be used.

Disclosure of Invention

In view of the above, it is necessary to provide a gas wave level gauge capable of improving the accuracy of liquid level measurement.

A gas wave liquid level gauge, comprising:

the horn mouth of the air wave horn cylinder is provided with a high arc line notch;

one end of the wave guide rod is connected with the horn tail end of the gas wave horn cylinder;

the instrument is connected with the other end of the wave guide rod through an instrument joint so that a gas wave core body in the instrument collects a liquid level reference signal in the gas wave horn cylinder;

and the power transmission circuit is arranged in the instrument and is connected with the air wave core body so as to convert the liquid level reference signal acquired by the air wave core body into a liquid level value.

In one embodiment, the gas wave level meter further comprises a fixing frame, the fixing frame is sleeved on the wave guide rod and is perpendicular to the wave guide rod, and the fixing frame is used for fixing the gas wave level meter on a measured liquid tank body.

In one embodiment, the position of the fixed frame on the waveguide rod is adjustable.

In one embodiment, the gas wave level meter further comprises a gas guide opening arranged on the meter shell, and the gas guide opening is used for communicating the wave guide rod with the atmosphere.

In one embodiment, the gas wave liquid level meter further comprises a gas guide tube, one end of the gas guide tube is connected with the gas guide port, and a tube opening at the other end of the gas guide tube faces the ground.

In one embodiment, the airway tube is formed by spirally winding a plurality of turns of hollow aluminum tube.

In one embodiment, the gas wave liquid level meter further comprises a meter electric connector, wherein the meter electric connector is arranged on a meter shell of the meter and is connected with the transmitting circuit.

In one embodiment, the wall of the air wave horn is a slope.

In one embodiment, the meter interface is a pressure probe for collecting the gas pressure in the gas wave horn.

In one embodiment, the meter interface is an electromagnetic wave probe, and the electromagnetic wave probe is used for transmitting electromagnetic waves and receiving the electromagnetic waves reflected by the liquid level.

Above-mentioned gas wave level gauge, the horn mouth of gas wave horn section of thick bamboo has high pitch arc breach, has broken the atress balance of interior toper liquid column, and the thick thing is difficult for adhesion section of thick bamboo wall, can effectively prevent the jam in guided wave pole hole, and big end down's interface, it is effectual to gather the atmospheric pressure, has saved the gas blowing device of the level gauge of blowing to avoid the influence of bubble, improved level measurement's accuracy.

Drawings

FIG. 1 is a schematic view of a blow level gauge in one embodiment of the conventional art;

FIG. 2 is a schematic view of a gas wave level gauge in one embodiment of the present application;

FIG. 3 is a schematic view of a gas wave level gauge in another embodiment of the present application;

FIG. 4 is a graph illustrating a force analysis of particles at the wall of a trumpet in an embodiment of the present application;

fig. 5 is a circuit configuration diagram of a transmitting circuit in an embodiment of the present application.

Wherein

100 horn tube

200 waveguide rod

300 meter connector

400 air wave core body

500 transmitting circuit

600 watch case

700 air guide port

800 meter electric connector

900 fixed mount

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships 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 and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Specifically, please refer to fig. 2 and fig. 3, fig. 2 is a schematic diagram of a gas wave level meter in an embodiment of the present application, and fig. 3 is a schematic diagram of a gas wave level meter in another embodiment of the present application, wherein in this embodiment, the gas wave level meter includes a gas wave horn 100, a wave guide rod 200, a meter, and a transmission circuit 500, wherein a horn tail of the gas wave horn 100 is connected to one end of the wave guide rod 200, the other end of the wave guide rod 200 is connected to the meter, and further, the wave guide rod 200 is connected to a case 600 of the meter.

The horn mouth of the gas wave horn cylinder 100 is provided with a high arc line notch, so that the gas wave liquid level meter makes full use of the characteristic that the liquid level is open, the port end of the high arc line notch horn cylinder 100 is adopted to collect the liquid level pressure, the notch horn cylinder 100 breaks the stress balance of an inner conical liquid column, sticky materials are not easy to adhere to the cylinder wall, the blockage of 200 holes of the wave guide rod can be effectively prevented, a small-end-large interface is adopted, the liquid level is connected to be an inclined plane, the air pressure collecting effect is good, and an air blowing device of the air blowing liquid level meter is omitted. In addition, the wall of the air wave horn 100 is an inclined plane, so that the stress can be balanced. The waveguide rod 200 can be a stainless steel metal hollow waveguide rod 200, and is stable and reliable and wide in application range.

Wherein, the one end of guided wave pole 200 can pass through the mode of bolt with the loudspeaker tail of gas wave horn section of thick bamboo 100 and be connected, for example the outer edge of the loudspeaker tail of gas wave horn section of thick bamboo 100 is provided with the screw thread, and similarly, the interior edge department of the corresponding end of guided wave pole 200 is provided with corresponding screw thread, like this through the mode of screw thread with both fixed connection. Optionally, the airwave horn 100 may be telescopic so that the height of the airwave horn 100 may be adjusted according to the depth of the liquid to be measured. Further, the instrument may be provided in the case 600 so that the other end of the wave guide rod 200 can be connected to the instrument provided in the case 600 by being fixed to the case 600, wherein the connection of the wave guide rod 200 to the case 600 may also be by a bolt, for example, a screw thread is provided at a position corresponding to an inner edge of the case 600, and a corresponding screw thread is provided at an outer edge of a corresponding end of the wave guide rod 200, so that the two are fixedly connected by a screw thread, wherein the inner edge and the outer edge may be correspondingly changed, which is not particularly limited.

In practical use, the wave guide rod 200 and the gas wave horn 100 extend into the liquid to be measured, for example, can extend into the bottom of the liquid tank to be measured (absolute zero level, liquid flowing in from the gap), or can extend into the start position (relative zero level) designated by the user. The pressure in the wave guide rod 200 can change along with the change of the liquid level, so that the instrument joint 300 at the other end of the wave guide rod 200 of the instrument is fixed with the wave guide rod 200, the liquid level reference signal in the gas wave horn 100 is collected through the gas wave core 400 of the instrument, and the liquid level reference signal is sent to the transmission circuit 500 in the instrument, namely, the liquid level reference signal collected by the gas wave core 400 can be converted into a liquid level value, namely, a liquid level height value.

Specifically, when the tank of the liquid to be measured is filled with liquid, the port of the air wave horn 100 is located in the liquid, so that the port can bear hydraulic pressure, the hydraulic pressure changes with the height value of the liquid level, the wave guide rod 200 can transmit the liquid level pressure to the instrument, the air wave core 400 of the instrument can sense the pressure change and transmit the pressure to the transmitting circuit 500, and the transmitting circuit 500 converts the pressure signal into a liquid level value.

Specifically, the working principle of the air wave level gauge in this embodiment is described in detail with reference to fig. 4, and fig. 4 is a graph illustrating a force analysis of particles at the wall of the horn 100 in one embodiment of the present application. The wall of the horn cylinder 100 is an inclined plane, liquid in the horn cylinder 100 bears gravity G, upward extrusion pressure (F viscosity) generated by liquid level pressure, reaction force (N pressure) of the inclined plane, friction force (F friction) of the inclined plane and buoyancy force (F float) of the liquid, wherein the reaction force can effectively reduce the upward pressure to enable the force in the vertical direction to be balanced. In addition, the orifice of the wave guide rod 200 is small, so that the pressure in the pipe and the liquid level pressure are balanced, the difference of the lengths of the inclined planes is formed by the high arc line notches, the stress balance of the conical liquid column in the bell mouth is broken, and sticky substances are easy to fall off.

It can be seen from the mechanical analysis that N presses downward component force, so that the sticky matter is easy to fall off, and has the anti-blocking effect.

Instrument position finding principle: static liquid at any height can generate pressure to the unit area of the bottom under the action of gravity. The unit pressure p is related to the liquid height h and the density rho:

p＝p0+ρ.g.h (2)

if the height h0 of the measured liquid level is the initial position, namely the zero position, then:

p＝p0+ρ.g.h+ρ.g.h0 (3)

can be arranged as follows:

p＝p0+ρ.g.(h+ h0) (4)

wherein p0 denotes the atmospheric pressure of the liquid surface, g denotes the acceleration of gravity

Equation (4) shows that the pressure p inside the static liquid varies in linear proportion with the liquid height h.

The gas wave liquid level meter product is widely applied to liquid level measurement and control of viscous media such as slurry melting slurry, a settling tank, a crude oil tank, jam, honey, crude oil and the like.

In the practical use process, the gas wave liquid level meter is taken as an example for explanation, and after the gas wave liquid level meter is installed, the gas wave liquid level meter is kept still for half an hour, and then the measurement can be carried out by connecting a 24VDC direct current power supply externally. The gas wave horn cylinder 100 extends into the medium, and the pressure generated by the liquid in the medium storage transmits the pressure (p0+ rho.g.h) to the low-pressure position of the wave guide rod 200 through the gas wave horn cylinder 100 and the wave guide rod 200.

The air wave core 400, e.g., a pressure sensitive core, at the other end of the waveguide rod is sensed, and when the pressure changes, the air wave core 400 is sensed. The silicon oil sensing film of the air wave core body 400 changes along with the sensed pressure, the monocrystalline silicon generates strain, the strain resistor directly diffused on the monocrystalline silicon generates change proportional to the measured pressure, and then a bridge circuit obtains a corresponding voltage output signal.

The single crystal silicon diaphragm is an elastic element, a group of equivalent resistors are diffused towards the specific direction of the single crystal silicon on the single crystal silicon diaphragm by utilizing the process of an integrated circuit, the resistors are combined into a bridge circuit, and the single crystal silicon diaphragm is arranged in a core body cavity, namely the gas wave core body.

The resistance produces corresponding voltage output signal, through the setting of the wisdom processing of pressure transmitting circuit 500, controller, with the liquid level transmission for 485 signal mode output, output standard current signal 4.0 ~ 20 mA. The LCD can directly display numerical values and can also be connected with a computer or a control box in a remote transmission way. 4.0mA indicates a 0 level and 20mA indicates a full scale level.

That is, the medium level fluctuation collects pressure changes along with the medium level fluctuation, and the pressure variable is converted into a transmittable standard electric output signal according to the continuous functional relation of the pressure variable, the current and the voltage signals. The instrument makes the sensitive element of the air wave core body deform during the working process through medium pressure change, further causes resistance change, obtains an output signal after being transmitted by a micro-processing circuit according to a given functional relation, and completes the measurement of the medium level value of the container.

Referring to fig. 5, the transmitting circuit may include a sensing element (where Pt refers to Pressure transmitting, and a Pressure transmitting and recording device, and Pk refers to a Pressure transmitting, and a Pressure striking, and generating device), an oscillation and demodulation circuit, an a/D signal conversion circuit, a microprocessor (for example, a microprocessor STM32F103ZGT6, a STM32F series of 32-bit ARM microcontrollers available from seiko Semiconductor (ST) corporation, and a core of the chips is Cortex-m3, which can linearize the sensor, range, transfer function, engineering unit, damping, communication, and diagnosis), and the microprocessor performs signal conversion and digital communication to convert the final level reference signal into a level value.

Above-mentioned gas wave level gauge, the horn mouth of gas wave horn section of thick bamboo 100 has high pitch arc breach, has broken the atress balance of interior toper liquid column, and the thick thing is difficult for adhesion section of thick bamboo wall, can effectively prevent the jam in 200 holes of guided wave pole, and big end down's interface, gathers atmospheric pressure respond well, has saved the gas blowing device of the level gauge of blowing to avoid the influence of bubble, improved level measurement's accuracy.

In one embodiment, the gas wave level meter further includes a fixing frame 900, the fixing frame 900 is sleeved on the wave guide rod 200 and is perpendicular to the wave guide rod 200, and the fixing frame 900 is used for fixing the gas wave level meter on a measured liquid tank body.

In one embodiment, the position of the fixing bracket 900 on the guide rod 200 is adjustable. Specifically, during wave guide rod 200 and the horn section of thick bamboo 100 of gas wave level gauge need stretch into the liquid that awaits measuring, need fix the gas wave level gauge in the filler of the jar of holding the liquid that awaits measuring like this, the initial high liquid level of tank bottoms or user's requirement is put into to breach horn section of thick bamboo 100 for example, and direct pressure transmission through hollow guide rod, gas wave core 400 obtains the absolute pressure of liquid level, saves and gathers negative pressure lateral pressure link. And the liquid level surface always has bubbles to emerge, and the bubbles at the bottom of the liquid tank are small and few, so that the influence of the bubbles can be ignored, and the influence of the bubbles on the liquid level can be effectively avoided.

After the initial height liquid level that the tank bottoms or the user required is put into to breach horn section of thick bamboo 100, then can fix the gas wave level gauge in the irritated mouthful department of the jar of holding the liquid that awaits measuring through mount 900, for example through the irritated mouthful department of buckle card at the jar that holds the liquid that awaits measuring to make the difficult quilt of gas wave level gauge remove. Thus, the mounting bracket 900 may be a flange or bracket for attachment to a tank. For example, the two ends of the fixing frame 900 may be sleeved with fixing buckles or connecting flanges, so that when the fixing frame 900 is placed at the irrigation opening, the fixing buckles or the connecting flanges may be fixed at the irrigation opening.

And optionally, the position of the fixing frame 900 on the guide rod 200 is adjustable, so that the fixed position can be adjusted according to the need, for example, the height of a tank containing the measured liquid. In addition, this guided wave pole 200 can also set to the telescopic, can be according to the height adjustment guided wave pole 200's of the jar that holds the liquid that is surveyed height like this to extension gas wave level gauge's measuring range.

In the above embodiment, the fixing frame 900 is arranged to fix the air wave level meter at the mouth of the tank for holding the liquid to be measured, so that the absolute zero liquid level or the relative zero liquid level is determined, and a foundation is laid for the accuracy of subsequent measurement.

In one embodiment, the gas wave level gauge further comprises a gas guide port 700, the gas guide port 700 is arranged on the meter shell 600 of the meter, and the gas guide port 700 is used for communicating the wave guide rod 200 with the atmosphere, so that the atmospheric pressure can be collected by the meter, the accurate height of the liquid level can be determined, and the accuracy of the atmospheric pressure can be guaranteed.

In one embodiment, the air wave level gauge further comprises an air duct, one end of the air duct is connected with the air guide port 700, and a pipe orifice at the other end of the air duct faces the ground, so that rainwater and the like can be prevented from entering, and liquid is prevented from flowing into the air duct to generate hydraulic pressure, and therefore hydraulic pressure measurement errors are avoided.

In one embodiment, the airway tube is formed by spirally winding a plurality of turns of hollow aluminum tube.

In the above embodiment, the meter case 600 is provided with a gas guide hole communicated with the gas cavity of the waveguide rod 200; the external air guide port 700 is in threaded connection with the watch case 600, so that the air cavity is communicated with the atmosphere, and the atmospheric pressure p0 is counteracted. Therefore, the pressure measurement of the induction core body is the unit pressure generated by the liquid level with the height of h, namely the differential pressure value, so that the link of collecting the pressure on the negative pressure side is omitted.

The external air duct is formed by spirally winding a plurality of circles of hollow aluminum pipes, and the orifice of the air duct faces downwards during installation, so that rainwater can be effectively prevented from entering; the gas-guide tube is connected with the meter shell 600, is far away from liquid, is exposed to the external atmospheric environment, plays a role of ventilation, has low possibility of generating condensation phenomenon, and can store the liquid at the lower point of the longer spiral to prevent the liquid from entering the inner cavity of the meter; the air duct with the upper end installed by the thread is convenient to clean and maintain.

In one embodiment, the gas wave level gauge further comprises a gauge electrical connector 800, wherein the gauge electrical connector 800 is disposed on the gauge case 600 and connected with the transmitting circuit 500. Specifically, the meter electrical connector 800 is used to power the transformer circuit 500, thereby ensuring proper operation of the meter. Wherein this table electrical interface 800 department can set up circuit protection device, prevent like this when outage suddenly or external power supply is unstable, produce the injury to the gas wave level gauge to reduce the life-span of gas wave level gauge, this circuit protection device can design through energy storage component, like this when outage suddenly or external power supply is unstable, energy storage component can release energy and guarantee the normal operating of gas wave level gauge, and optionally, this energy storage component can be inductance or electric capacity.

In one embodiment, the meter interface is a pressure probe that is used to collect the gas pressure in the gas horn 100.

In one embodiment, the meter interface is an electromagnetic wave probe, and the electromagnetic wave probe is used for transmitting electromagnetic waves and receiving the electromagnetic waves reflected by the liquid level.

Please refer to fig. 2 and fig. 3, wherein fig. 2 is a diagram illustrating hydrostatic pressure principle for measuring liquid level, and fig. 3 is a diagram illustrating an electromagnetic wave principle for measuring liquid level.

The gas wave liquid level meter in fig. 2 fully utilizes the characteristic of liquid level opening, and adopts a high arc line notch horn cylinder 100 port end to collect liquid level pressure. The pressure-transmitting air duct has a horn head end penetrating into the bottom position (absolute zero liquid level, liquid flowing in from the gap) of the liquid tank to be measured or the initial position (user-specified, relative zero liquid level), and the flange connection tank body or the bracket is vertically fixed. When the tank body is filled with liquid, the port of the gas wave horn 100 is positioned in a medium and bears hydraulic pressure, the hydraulic pressure changes along with the height of the liquid level, the liquid level pressure is transmitted to the tank opening instrument by the wave guide rod 200, the pressure is sensed and transmitted by the instrument core, and the pressure signal is converted and transmitted by the instrument circuit board.

The gas wave core 400 of the gas wave liquid level meter in fig. 3 emits electromagnetic waves, then the liquid level reflects the waves, and then the gas wave core 400 receives the echo waves, and the transmitting circuit 500 processes and converts the output liquid level signals. The horn 100 acts as an antenna and the large end face is guaranteed to extend at least 10mm into the vessel to avoid strong reflections at the end face of the connector.

The sine-shaped air wave signal is transmitted along the guide rod and returns when meeting the liquid level near the bell mouth. The digital signal circuit identifies the sent signal, and calculates the liquid level height information according to the pulse time travel and the environment factors such as the density of the medium where the sound wave is located. If high-precision liquid level measurement is needed, schemes such as an air hammer, a frequency modulation oscillation motor, an intelligent electromagnetic valve, a vacuum interlayer waveguide tube and the like can be selected and allocated.

The principle of the scheme is as follows: the static liquid surface of any height can emit electromagnetic waves, the time T from emission to return of pulse waves, the distance D from the liquid surface to the emitting surface:

D＝C.T/2 (5)

wherein C is the propagation speed of electromagnetic wave, equal to the speed of light, and is constant

H-can height H-D (6)

Equations (5) and (6) indicate that the static liquid level height h varies in linear inverse proportion with the increase of the reflection time period T.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A gas wave liquid level gauge, comprising:

the horn mouth of the air wave horn cylinder is provided with a high arc line notch;

one end of the wave guide rod is connected with the horn tail end of the gas wave horn cylinder;

the instrument is connected with the other end of the wave guide rod through an instrument joint so that a gas wave core body in the instrument collects a liquid level reference signal in the gas wave horn cylinder;

and the power transmission circuit is arranged in the instrument and is connected with the air wave core body so as to convert the liquid level reference signal acquired by the air wave core body into a liquid level value.

2. The gas wave liquid level meter according to claim 1, further comprising a fixing frame, wherein the fixing frame is sleeved on the wave guide rod and is perpendicular to the wave guide rod, and the fixing frame is used for fixing the gas wave liquid level meter on a measured liquid tank body.

3. The gas wave level gauge of claim 2, wherein the position of the fixed frame on the wave guide rod is adjustable.

4. The gas wave level gauge of claim 1, further comprising a gas guide port opened in a case of the gauge, the gas guide port being configured to communicate the wave guide rod with the atmosphere.

5. The air wave liquid level meter according to claim 4, further comprising an air duct, wherein one end of the air duct is connected with the air guide port, and a pipe orifice at the other end of the air duct faces the ground.

6. A method according to claim 5, wherein the airway tube is formed from a plurality of helical windings of hollow aluminium tube.

7. The gas wave level gauge of claim 4, further comprising a gauge electrical connector disposed on a gauge housing of the gauge and connected to the transmitting circuit.

8. The air wave level gauge of any one of claims 1 to 7, wherein the wall of the air wave horn is beveled.

9. The gas wave level gauge of any one of claims 1 to 7, wherein the gauge interface is a pressure probe for collecting gas pressure in the gas wave horn.

10. The gas wave liquid level gauge according to any one of claims 1 to 7, wherein the gauge interface is an electromagnetic wave probe for emitting electromagnetic waves and receiving electromagnetic waves reflected by the liquid surface.

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