CN113324623B

CN113324623B - Capacitance guided wave magnetic composite liquid level meter and measuring device

Info

Publication number: CN113324623B
Application number: CN202110701383.5A
Authority: CN
Inventors: 呼秀山; 夏阳; 李圆圆
Original assignee: Beijing Ruida Instrument Co ltd
Current assignee: Beijing Ruida Instrument Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2023-03-24
Anticipated expiration: 2041-06-23
Also published as: CN113324623A

Abstract

The utility model provides a compound level gauge of electric capacity guided wave magnetic for measure the liquid level of being surveyed liquid, include: a float including a magnetic portion and movable up and down with a liquid level; the wave guide wire is applied with measuring current so that the wave guide wire generates torsional wave pulse at the position of the floater, and the position of the floater is calculated by applying time difference between the time of measuring pulse current and the time of obtaining torsional wave pulse in a magnetostrictive measuring mode so as to obtain the liquid level; and the waveguide wire is arranged in the inner cavity of the metal outer sleeve, wherein the capacitance guided-wave magnetic composite liquid level meter can measure the liquid level in a magnetostriction measurement mode, a capacitance measurement mode and/or a guided-wave radar measurement mode. The present disclosure also provides a measuring device.

Description

Capacitance guided wave magnetic composite liquid level meter and measuring device

Technical Field

The disclosure relates to a capacitive guided wave magnetic composite liquid level meter and a measuring device.

Background

In the process of level measurement, under certain application scenarios, a high reliability measurement result is required. In order to realize the measurement result, a plurality of independent liquid level meters with different principles are often required to be installed to measure the liquid level, the output results of the different liquid level meters are compared with each other, and if the difference of the measurement results is large, an alarm is given.

For example, in chinese patent CN207528294U, three different liquid level meters are used to achieve the accuracy and reliability of the measurement. However, the measurement methods in the prior art cause great installation problems and are very costly. That is, the conventional meters require a plurality of meters to be installed to complete tasks, which causes various problems such as a large number of meters, a large number of installation positions, and a large space occupation.

Disclosure of Invention

In order to solve one of the technical problems, the present disclosure provides a capacitive guided wave magnetic composite liquid level meter and a measuring device.

According to an aspect of the present disclosure, a capacitive guided wave magnetic composite liquid level meter for measuring a liquid level of a measured liquid, comprises:

a float including a magnetic portion and movable up and down with the liquid level;

a wave guide wire to which a measuring current is applied so that the wave guide wire generates a torsional wave pulse at the position of the float, and the position of the float is calculated by a time difference between a time of applying the measuring pulse current and a time of obtaining the torsional wave pulse in a magnetostrictive measuring mode so as to obtain the liquid level; and

a metal outer sleeve, the waveguide wire being disposed in a lumen of the metal outer sleeve,

wherein the capacitive guided-wave magneto-restrictive composite liquid level meter can measure the liquid level by a magnetostrictive measurement mode and a capacitive measurement mode and/or a guided-wave radar measurement mode,

when a capacitance measurement mode is adopted, the metal outer sleeve is used as a measurement electrode for capacitance measurement, and the liquid level is obtained through the difference of capacitance caused by the difference of dielectric constants of media between the measurement electrode and a grounding electrode; when a guided wave radar measurement mode is adopted, the metal outer sleeve is used as a metal probe rod of the guided wave radar, microwave signals are transmitted through the metal outer sleeve, then the signals are returned along the metal outer sleeve after being reflected by the liquid level or the floater, and the liquid level is obtained through the time difference between the transmitted microwave signals and the returned signals.

According to at least one embodiment of the present disclosure, the metal outer sleeve is insulated from a mounting base of the gauge and a container containing a liquid.

According to at least one embodiment of the present disclosure, the liquid level gauge further comprises a circuit structure,

the loop structure is a loop lead wire which is used for transmitting signals generated by the waveguide wire and is arranged in the inner cavity of the metal outer sleeve; or alternatively

The loop structure is electrically connected with the waveguide wire at the bottom of the loop structure through the metal outer sleeve to form a loop, and meanwhile, the metal outer sleeve tensions the waveguide wire at the bottom of the metal outer sleeve so as to transmit signals generated by the waveguide wire. .

According to at least one embodiment of the present disclosure, the outer tube wall of the metal outer tube is provided with an insulating layer.

According to at least one embodiment of the present disclosure, the level gauge is provided with a grounded metal tube disposed coaxially in parallel with the metal outer sleeve and disposed outside the metal outer sleeve.

According to at least one embodiment of the present disclosure, the float is disposed outside the grounded metal pipe and is movable along the grounded metal pipe as a liquid level changes; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level.

According to at least one embodiment of the present disclosure, the grounded metal pipe is a metal pipe of a non-ferromagnetic material.

According to at least one embodiment of the present disclosure, a positioning structure is provided between the grounded metal tube and the metal outer sleeve so as to maintain a spacing between the grounded metal tube and the metal outer sleeve.

According to at least one embodiment of the present disclosure, the grounded metal pipe serves as a ground electrode in the capacitance measurement mode, and a bottom portion and/or a side portion of the grounded metal pipe has an opening portion so as to equalize a liquid level between the grounded metal pipe and the metal outer sleeve with a liquid level of a container containing the liquid.

According to at least one embodiment of the present disclosure, the mounting base of the level gauge is a metal mounting base, and the grounded metal tube is connected with the metal mounting base.

According to at least one embodiment of the present disclosure, the capacitance-guided wave magnetic composite liquid level meter can measure the liquid level by a magnetostrictive measurement mode and a capacitance measurement mode, and the metal outer sleeve serves as a measurement electrode for capacitance measurement, and a container wall of a container containing the liquid or a separately provided grounded metal pipe serves as a ground electrode, and in the capacitance measurement mode, the liquid level is obtained by measuring a capacitance change between the metal outer sleeve and the container wall or the grounded metal pipe.

According to at least one embodiment of the present disclosure, the grounded metal tube is coaxially arranged in parallel with the metal outer sleeve and is disposed outside the metal outer sleeve.

According to at least one embodiment of the present disclosure, the float is disposed outside the grounded metal pipe and is movable along the grounded metal pipe with a change in liquid level.

According to at least one embodiment of the present disclosure, the grounded metal pipe serves as a ground electrode in the capacitance measurement mode, and a bottom and/or a side of the grounded metal pipe has an opening portion so as to equalize a level of liquid between the grounded metal pipe and the metal outer sleeve with a level of a container containing the liquid.

According to at least one embodiment of the present disclosure, the mounting base is a metal mounting base, and the grounded metal pipe is connected with the metal mounting base.

According to at least one embodiment of the present disclosure, the liquid level gauge includes a capacitance measuring circuit connected with the metal outer sleeve and a wall of the grounded metal tube or container.

According to at least one embodiment of the present disclosure, the capacitance guided-wave and magnetic composite liquid level meter can measure the liquid level by a magnetostrictive measurement mode and a guided-wave radar measurement mode, the metal outer sleeve serves as a metal probe of a guided-wave radar, a microwave signal is transmitted through the metal outer sleeve, then a signal is returned along the metal outer sleeve after being reflected by the liquid level or a floater, and the liquid level is obtained by a time difference between the transmitted microwave signal and the returned signal.

According to at least one embodiment of this disclosure, the level gauge includes guided wave radar measurement circuitry that is connected with the metal outer sleeve.

According to at least one embodiment of the present disclosure, the level gauge is provided with a grounded metal tube which is disposed coaxially with the metal outer sleeve and outside the metal outer sleeve.

According to at least one embodiment of the present disclosure, the float is disposed outside the grounded metal pipe and is movable along the grounded metal pipe with a change in liquid level; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level.

According to at least one embodiment of the present disclosure, the liquid is admitted between the grounded metal tube and the metal outer sleeve and in the metal outer sleeve and is equal to the level of the liquid in the container containing the liquid.

According to at least one embodiment of the present disclosure, the capacitive guided-wave magneto-restrictive composite liquid level gauge is capable of measuring the liquid level by means of magnetostrictive measurement, capacitive measurement and guided-wave radar measurement,

the metal outer sleeve is used as a measuring electrode for capacitance measurement, and a container wall of a container for containing the liquid or a separately arranged grounding metal tube is used as a grounding electrode, and in the capacitance measurement mode, the liquid level is obtained by measuring capacitance change between the metal outer sleeve and the container wall or the grounding metal tube; in addition, the metal outer sleeve is used as a metal probe of a guided wave radar, a microwave signal is transmitted through the metal outer sleeve, then a signal is returned along the metal outer sleeve after the signal is reflected by the liquid level or a floater, and the liquid level is obtained through the time difference between the transmitted microwave signal and the returned signal.

According to at least one embodiment of the present disclosure, a liquid level meter is provided with a grounded metal tube which is disposed coaxially in parallel with the metal outer sleeve and outside the metal outer sleeve.

According to at least one embodiment of the present disclosure, the grounded metal pipe serves as a ground electrode in the capacitance measuring manner, and a bottom and/or a side of the grounded metal pipe has an opening portion so as to equalize a level of liquid between the grounded metal pipe and the metal outer sleeve with a level of a container containing the liquid.

According to at least one embodiment of this disclosure, the level gauge includes a capacitance measurement circuit and a guided wave radar measurement circuit, the capacitance measurement circuit with the metal outer tube and the ground metal pipe or the container wall is connected, the guided wave radar measurement circuit with the metal outer tube is connected.

According to at least one embodiment of the present disclosure, the apparatus further includes a switching circuit to switch the capacitive measurement mode and the guided wave radar measurement mode at different times.

According to another aspect of the present disclosure, a measurement device includes:

the gauge of any preceding claim, wherein the gauge is capable of measuring the liquid level by at least magnetostrictive and capacitive measurements; and

and the calibration part calibrates the relation between the capacitance and the liquid level in the capacitance measurement mode according to the liquid level result measured by the magnetostrictive measurement mode.

According to another aspect of the present disclosure, a measuring device for measuring a water content in an oil product, comprises:

and the comparison part compares the liquid level value measured by the magnetostrictive way with the capacitance value output by the capacitance measuring way to obtain the water content in the oil product.

According to another aspect of the present disclosure, a measuring device for measuring a dual oil-water interface includes:

the liquid level gauge according to any of the preceding claims, wherein the liquid level gauge is capable of measuring the liquid level by at least a magnetostrictive measurement mode and a capacitive measurement mode, wherein the magnetostrictive measurement mode is used for measuring the oil level and the capacitive measurement mode is used for measuring the water level.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural view of a capacitive guided wave magneto-composite liquid level meter according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a watch header according to one embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a watch head, according to one embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant matter and not restrictive of the disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, the features of the various embodiments/examples may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in an order reverse to the order described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically connected, electrically connected, and the like, with or without intervening components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" upper, "and" side (e.g., as in "sidewall") to describe the relationship of one component to another (other) component as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

According to one embodiment of the present disclosure, a capacitive guided wave magnetically induced composite liquid level meter is provided.

Fig. 1 shows a capacitive guided wave magneto-composite liquid level meter according to one embodiment of the present disclosure. As shown in fig. 1, wherein the capacitive guided wave magneto-composite liquid level meter 10 can include a detection portion 100 and a meter head portion 200.

In the detection part 100, a float 110, a waveguide wire 120, and a metal outer sleeve 130 may be included.

The float 110 may comprise magnetic parts 111, 112, wherein the magnetic parts 111, 112 may be permanent magnets, e.g. in the form of permanent magnet rings. The float 110 may be arranged outside the metal outer sleeve 130 of the magnetostrictive liquid level gauge and the float 110 may move up and down as the liquid level changes. This allows the change in liquid level to be sensed by the float 110.

The wave guide wire 120 is applied with a measuring current so that the wave guide wire generates a torsional wave pulse at the position of the float 110, and the position of the float 110 is calculated in a magnetostrictive measuring mode by the time difference between the time of applying the measuring pulse current and the time of obtaining the torsional wave pulse to obtain the liquid level. Specifically, when the sensor of the magnetostrictive liquid level gauge 10 is in operation, the circuit part of the sensor will excite a pulsed current on the waveguide wire 120, which will generate a pulsed current magnetic field around the waveguide wire 120 when the current propagates along the waveguide wire 120. The float 110 outside the sensor rod of the magnetostrictive level gauge can move up and down the rod (metal outer sleeve 130) as the liquid level changes. A set of permanent magnet rings may be provided inside the float. When the pulse current magnetic field meets the magnetic ring magnetic field generated by the float 110, the magnetic field around the float changes so that the wave guide wire 120 made of magnetostrictive material generates a torsional wave pulse (mechanical vibration wave) at the position of the float 110, and the pulse (mechanical vibration wave) is transmitted back at a fixed speed and detected by the detection mechanism. The position at which the float is located, i.e. the position of the liquid level, can be accurately determined by measuring the time difference between the pulse current and the received torsional wave detected by the detection mechanism.

The metal outer sleeve 130 may act as a side bar for the magnetostrictive liquid level gauge, and the waveguide wire 120 may be housed in the inner lumen of the metal outer sleeve 130. In addition, the torsional wave pulse formed by the wave guide wire 120 can be transmitted back to the detection means (magnetostrictive measuring circuit) via an echo structure in the form of a separately provided return line 121. The return conductor 121 can also be disposed in the inner lumen of the metal jacket 130. Further, in the present disclosure, it is preferable to implement the function of the loop wire 121 with the metal outer sleeve 130, so that the loop wire 121 may be omitted.

The metal outer sleeve 130 may be one of a plurality of metal tubes around the periphery of the waveguide wire 120. The metal outer sleeve 130 is insulated from the mounting base 140 of the fluid level gauge 10 and the container (not shown) containing the fluid. The outer surface of the metal outer sleeve 130 may be provided with an insulating layer 150, wherein the insulating layer 150 is shown in dashed lines in fig. 1. In the present disclosure, the insulating layer 150 may be an insulating material such as plastic, ceramic, glass, etc., and the insulating layer 150 may be a plastic pipe or a sprayed plastic coating that is sleeved on the outer surface of the metal outer sleeve 130. Wherein the plastic material may be PTFE or PFA. And the plastic material is sealed at the bottom of the metal outer sleeve 130.

The metal outer sleeve 130 may be made of stainless steel or other metal materials, such as 316L stainless steel or 304 stainless steel, etc.

In the case where the function of the return conductor 121 is fulfilled by the metal outer jacket 130 as an echo structure, the waveguide wire 120 can be tensioned at the bottom by the metal outer jacket 130.

In addition, insulation is required between the metal outer sleeve 130 and the mounting base 140. The insulating material can be plastic, ceramic or glass. A sealing member 142 is provided between the metal outer sleeve 130 and the insulating portion 141. The sealing element 142 may be formed by an O-ring, a gasket, or the like. The insulating portion 141 and the mounting base 140 may have a sealing member therebetween, and the sealing member may be configured as an O-ring or a gasket. In addition, the sealing method can also be ceramic sintering or glass sintering.

In the present disclosure, the mounting base 140 may be a metal or non-metal material, and the mounting base 140 may be attached to or welded to the flange.

In the present disclosure, in addition to magnetostrictive measurement, the liquid level can be measured by capacitive measurement and/or guided wave radar measurement through innovative settings.

The metal outer sleeve 130 serves as a measuring electrode for capacitance measurement when capacitance measurement is employed, and the grounding electrode for capacitance measurement may be employed in other parts or in the wall body of the container, and when other parts are employed, a grounded metal tube described later may be employed. The liquid level is obtained by measuring the difference in capacitance due to the difference in the dielectric constant of the medium between the electrodes and the earth.

When the guided wave radar measurement mode is adopted, the metal outer sleeve 130 can be used as a metal probe of the guided wave radar, the metal outer sleeve transmits microwave signals, then the signals are returned along the metal outer sleeve after being reflected by the liquid level or the floater, and the liquid level is obtained through the time difference between the transmitted microwave signals and the returned signals. For example, when the float is disposed on the periphery of the metal outer sleeve 130, because the liquid level is consistent with the float (the float floats up and down according to the liquid level), the transmitted microwave signal will contact the float to generate a return signal sometimes, and when the guided wave radar measurement mode is used, the microwave signal may be reflected by the liquid level or reflected by the float to generate a return signal.

If the metal outer sleeve 130 is used as one electrode for the capacitance measurement and the vessel wall is used as the other electrode for the capacitance measurement, the capacitance obtained by the capacitance measurement will be affected by the diameter of the vessel wall. A coaxial grounded metal tube may be used as the other electrode for the capacitive measurement in the following embodiments.

In addition, if the float 110 is sleeved on the outer side wall of the metal outer sleeve 130, the float 110 may directly reflect the microwave signal emitted from the guided wave radar, so that the objects corresponding to the magnetostrictive measurement and the guided wave radar measurement are the float 110. Although there is a correlation between the float and the level, both of these measurement methods cannot be used once the float is damaged. Thus, as described below, it is preferable to provide a coaxial grounded tube at the outer periphery of the metal outer sleeve, so that the space between the coaxial grounded tube and the metal outer sleeve can be filled with liquid, and thus the structure becomes a coaxial guided wave radar and a coaxial capacitance liquid level meter, so that the measured object is the liquid level directly. The float 110 then slides up and down the outside of the coaxial grounded metal tube and the magnetic field can penetrate the coaxial grounded metal tube and outer sleeve to reach the inner waveguide wire. Thus, a multifunctional instrument with better use effect is completed.

According to a preferred embodiment of the present disclosure, the gauge 10 is provided with a grounded metal tube 160, the grounded metal tube 160 being arranged coaxially with the metal outer sleeve 130 and the grounded metal tube 160 being arranged outside the metal outer sleeve 160. That is, the grounding metal pipe 160 may be disposed in parallel to the outer metal sleeve 130 at the periphery thereof.

The metal outer sleeve 130 may constitute a measuring electrode in a capacitance measuring method, and the grounding metal tube 160 may constitute a grounding electrode in a capacitance measuring method. Or the metal outer sleeve 130 may constitute a ground electrode in a capacitive measurement mode and the grounded metal tube 160 may constitute a measurement electrode in a capacitive measurement mode. The metal outer sleeve 130 and/or the grounded metal tube 160 may be connected to a capacitance measuring circuit.

The grounded metal pipe 160 is a metal pipe of a non-ferromagnetic material. For example, stainless steel tube or copper tube, etc., so as to ensure that the magnetic field used in the magnetostrictive measurement mode can pass through the grounded metal tube 160, thereby ensuring the effectiveness of the magnetostrictive measurement mode.

Further, in the case where the grounded metal pipe 160 is provided, the float 110 may be provided outside the grounded metal pipe 160 and move up and down with the change of the liquid level, for example, by sliding.

In addition, the space formed between the grounded metal tube 160 and the metal outer sleeve 130 should allow liquid to enter and it is necessary to ensure that the liquid between the two needs to be at the same level as the liquid contained in the container. Thus, when a capacitance measurement mode is adopted, the liquid level of the liquid contained in the container is measured by measuring the liquid level of the liquid between the two. For example, a plurality of apertures/openings may be provided in the side wall and bottom of the grounded metal tube 160 to allow liquid between the grounded metal tube 160 and the metal outer sleeve 130 to be in liquid communication with the liquid in the container to have a constant level.

In the capacitive measurement mode, the metal outer sleeve 130 extends deep into the liquid and serves as one electrode for the capacitive measurement, and the container wall or grounded metal tube 160 serves as the other electrode for the capacitive measurement. The medium between the two electrodes is the liquid and the gas above the liquid. Because the dielectric constant epsilon 1 of the liquid is different from the dielectric constant epsilon 2 of the gas, for example, epsilon 1 is larger than epsilon 2, when the liquid level rises, the total dielectric constant value between two electrodes at the corresponding position is increased, and therefore, the capacitance is increased. On the contrary, when the liquid level drops, the total dielectric constant value between the two electrodes at the corresponding positions is reduced, and the capacitance is also reduced. The change in the liquid level can be measured by the change in the capacitance between the two electrodes.

In the present disclosure, a positioning structure is preferably provided between the grounding metal pipe 160 and the metal outer sleeve 130 in order to maintain a space between the grounding metal pipe and the metal outer sleeve. Wherein the positioning structure may provide support to the two and maintain a spacing or the like therebetween by a positioning block or the like.

In the case where the mounting base 140 is made of a metal material, a grounding metal pipe 160 may be connected to the metal base 140 to achieve grounding. Wherein the term "ground" in this disclosure is not considered to be directly connected to ground, it may be understood as virtual ground.

In the technical scheme in this disclosure, through ingenious design, fuse the multiple measurement mode to the magnetostrictive liquid level meter in, can realize the form of magnetostrictive liquid level meter + electric capacity level meter like this, realize the form of magnetostrictive liquid level meter + guided wave radar level meter, realize the form of magnetostrictive liquid level meter + electric capacity level meter + guided wave radar level meter. In the liquid level measuring instrument, liquid level measurement with various principles is realized through one instrument head, so that the reliability of the instrument can be greatly improved, and the requirement of a high-reliability application scene is met.

According to one embodiment, the capacitance guided wave magnetic composite liquid level meter can measure the liquid level by a magnetostriction measurement mode and a capacitance measurement mode, the metal outer sleeve serves as a measurement electrode for capacitance measurement, and the container wall of the container containing the liquid or a separately arranged grounding metal pipe serves as a grounding electrode, and in the capacitance measurement mode, the liquid level is obtained by measuring capacitance changes between the metal outer sleeve and the container wall or the grounding metal pipe. The grounding metal tube and the metal outer sleeve are coaxially arranged in parallel and are arranged outside the metal outer sleeve. The float is arranged outside the grounded metal pipe and can move along the grounded metal pipe along with the change of the liquid level.

The grounding metal tube is made of non-ferromagnetic material. A positioning structure is arranged between the grounding metal tube and the metal outer sleeve so as to keep the distance between the grounding metal tube and the metal outer sleeve. The grounded metal pipe serves as a grounding electrode in a capacitance measuring manner, and the bottom and/or side of the grounded metal pipe has an opening portion so that the liquid level between the grounded metal pipe and the metal outer sleeve pipe is equal to the liquid level of the container containing the liquid. The mounting base is a metal mounting base, and the grounding metal pipe is connected with the metal mounting base.

In the case of measuring the liquid level by a capacitive guided-wave magnetostrictive composite liquid level meter in a magnetostrictive measurement mode and a capacitive measurement mode, the liquid level meter may include a magnetostrictive measurement circuit and a capacitive measurement circuit, wherein the circuits may be disposed in the head of the meter, the capacitive measurement circuit may be connected to the metal outer sleeve and the grounded metal tube or the container wall of the container, and the magnetostrictive measurement circuit may be connected to the waveguide (and the loop wire/metal outer sleeve).

According to another embodiment, the capacitance guided-wave and magnetic composite liquid level meter can measure the liquid level through a magnetostriction measurement mode and a guided-wave radar measurement mode, the metal outer sleeve serves as a metal probe of the guided-wave radar, microwave signals are transmitted through the metal outer sleeve, then the signals are returned along the metal outer sleeve after being reflected by the liquid level or a floater, and the liquid level is obtained through the time difference of the transmitted microwave signals and the returned signals.

The liquid level meter is provided with a grounding metal tube which is coaxially arranged in parallel with the metal outer sleeve and is arranged outside the metal outer sleeve.

The floater is arranged on the outer side of the grounding metal pipe and can move along the grounding metal pipe along with the change of the liquid level; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level. The grounding metal tube is made of non-ferromagnetic material. A positioning structure is arranged between the grounding metal tube and the metal outer sleeve so as to keep the distance between the grounding metal tube and the metal outer sleeve.

The liquid is admitted between the grounded metal tube and the metal outer casing and in the metal outer casing and is equal to the level of the liquid in the container containing the liquid.

Under the condition that the capacitance guided wave and magnetic composite liquid level meter measures the liquid level in a magnetic induced shrinkage and elongation measurement mode and a guided wave radar measurement mode, the liquid level meter comprises a magnetic induced shrinkage and elongation measurement circuit and a guided wave radar measurement circuit, wherein the circuits can be arranged in a meter head part, the guided wave radar measurement circuit is connected with a metal outer sleeve, and the magnetic induced shrinkage and elongation measurement circuit can be connected with a wave guide line (and a loop wire/metal outer sleeve).

According to another embodiment, the capacitance-guided wave magnetic composite liquid level meter can measure the liquid level in a magnetostriction measurement mode, a capacitance measurement mode and a guided wave radar measurement mode, wherein the metal outer sleeve is used as a measurement electrode for capacitance measurement, the container wall of the container containing the liquid or an independently arranged grounding metal tube is used as a grounding electrode, and in the capacitance measurement mode, the liquid level is obtained by measuring capacitance change between the metal outer sleeve and the container wall or the grounding metal tube; in addition, the metal outer sleeve is used as a metal probe rod of the guided wave radar, microwave signals are transmitted through the metal outer sleeve, then signals are returned along the metal outer sleeve after the signals are reflected by the liquid level or the floater, and the liquid level is obtained through the time difference of the transmitted microwave signals and the returned signals.

The floater is arranged on the outer side of the grounding metal pipe and can move along the grounding metal pipe along with the change of the liquid level; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level. The grounding metal tube is made of non-ferromagnetic material. A positioning structure is arranged between the grounding metal tube and the metal outer sleeve so as to keep the distance between the grounding metal tube and the metal outer sleeve. The grounded metal pipe serves as a grounding electrode in a capacitance measuring manner, and the bottom and/or side of the grounded metal pipe has an opening portion so that the liquid level between the grounded metal pipe and the metal outer sleeve pipe is equal to the liquid level of the container containing the liquid. The mounting base of the liquid level meter is a metal mounting base, and the grounding metal pipe is connected with the metal mounting base.

The capacitance guided wave and magnetic composite liquid level meter can measure the liquid level through a magnetic induced shrinkage or elongation measuring mode, a capacitance measuring mode and a guided wave radar measuring mode, under the condition, the liquid level meter can comprise a magnetic induced shrinkage or elongation measuring circuit, a capacitance measuring circuit and a guided wave radar measuring circuit, the capacitance measuring circuit is connected with a metal outer sleeve and the container wall of a grounding metal pipe or a container, the guided wave radar measuring circuit is connected with the metal outer sleeve, and the magnetic induced shrinkage or elongation measuring circuit can be connected with a wave guide line (and a loop wire/metal outer sleeve).

The system can also comprise a switching circuit so as to switch the capacitance measuring mode and the guided wave radar measuring mode at different moments.

The capacitance guided wave and magnetic composite liquid level meter can measure the liquid level through a magnetostriction measurement mode, a capacitance measurement mode and/or a guided wave radar measurement mode, and measurement signals of two or three measurement modes can be coupled into one circuit and then connected with an external part through a common connecting piece. For example, in the case of using both the guided wave radar measurement mode and the capacitance measurement mode, the signals of the guided wave radar measurement module and the capacitance measurement module may be coupled to one line, and then connected to the metal outer sleeve by using a common connection member. And as mentioned above, a switching circuit such as a switch can be adopted, so that the guided wave radar measurement module and the capacitance measurement module can measure at different times, that is, the guided wave radar measurement module and the capacitance measurement module can be connected to the metal outer sleeve at different times through the switching circuit, thereby realizing corresponding measurement functions.

The magnetostrictive measurement circuit, the capacitance measurement circuit, and the guided wave radar measurement circuit described above can be provided in the form of corresponding modules in the watch head 200. As shown in fig. 2 and 3.

Although the magnetostrictive, capacitive, and guided-wave radar measurement modules are illustrated in fig. 2 and 3, only the magnetostrictive and capacitive measurement modules or only the magnetostrictive and guided-wave radar measurement modules may be included according to the respective measurement methods.

As shown in fig. 2, two or three measurement modules may be operated by one arithmetic control unit, or, as shown in fig. 3, may be operated by independent arithmetic control units. The selection of one or more arithmetic control units is required to be set according to the reliability level required on site, for example, when the reliability level requirement is high, an independent arithmetic control unit can be arranged, and conversely, one arithmetic control unit can be used.

In addition, it is shown in fig. 2 that two or three measurement modules may share one communication module for the communication module and the power supply module. In fig. 3, two or three measurement modules are shown as each employing a separate communication module. Wherein the communication module can realize the function of communicating with the external device of the gauge head, and the power module can receive electric energy from an external power supply, thereby supplying power to the inside of the liquid level gauge, and the power module can also be in the form of a rechargeable battery.

Although not shown in fig. 2 and 3, a storage module may be further included in the table header, and the storage modules may be shared or individually provided for the same reason.

The man-machine interface circuit can adopt the same man-machine interface circuit, and the display part can be provided with measuring signals measured by different measuring modes. For example, the liquid level meter outputs two or three liquid level signals, and these signals may be displayed on a display portion for a user to observe, etc.

In the disclosure, two or three measurement modules may perform measurement operations simultaneously, or may perform measurement at different times by using a time-sharing method. In the time-sharing measurement, the measurement can be realized by the switching circuit. The liquid level meter can also output a liquid level alarm signal or an instrument fault alarm or an alarm signal for reminding field personnel to maintain.

In addition, in order to verify the reliability of the liquid level meter, the liquid level meter disclosed by the invention can compare a plurality of data measured by the magnetostrictive measurement module, the capacitance measurement module or the guided wave radar measurement module, and select more reliable liquid level data to output. In addition, the liquid level reliability is judged by other external equipment according to the liquid level values measured by the output multiple measuring modules.

Through the liquid level meter, the integration of various measuring modes can be realized through design, so that the measuring reliability is greatly improved.

In addition, in the measuring apparatus employing the level gauge of the present disclosure, other advantageous effects can also be achieved.

In one embodiment, calibration of the capacitance measurement mode may be implemented. For example, it is common for capacitive gauges (capacitive measurement mode) to establish a calibration of capacitance versus level height after installation, which is typically done on-site. Other equipment is needed to assist in achieving field calibration. But since the liquid level meter of the present disclosure may measure the liquid level by means of magnetostrictive measurements, the capacitive liquid level meter part is then automatically calibrated by means of magnetostrictive measurements. The gauge can automatically complete the calibration of the capacitive gauge by recording the capacitance values measured by the capacitive gauge at two or more different levels measured by magnetostriction. This calibration may be a two-point calibration or a multi-point calibration.

In another embodiment, a measuring device comprising the disclosed level gauge may also perform the function of measuring the moisture or water content of an oil product. Under the condition that the water content or the water content of the oil product is fixed, the measured value of the liquid level of magnetostriction and the capacitance value of capacitance measurement are in a direct proportion relation, if the capacitance is changed compared with an expected value, the water content in the oil product is changed, and the change of the water content can be calculated according to the capacitance and the measured value of the liquid level of magnetostriction. The alarm or the output of the water content can be made according to the change of the water content.

If continuous water content is output, laboratory calibration needs to be carried out on the relation between the liquid levels of oil products with different water contents and the capacitance. Reference data is established and stored in the gauge. The gauge is then output according to the reference data.

In another embodiment, the measuring device comprising the liquid level meter disclosed by the invention can also realize the measuring function of an oil-water double interface. In the case of magnetostrictive measurement, the float will float on the oil, reflecting the overall liquid level, and the position of the float is measured using magnetostrictive measurement to measure the oil level, and the water level is measured using capacitive measurement (since the dielectric constants used for capacitive measurement are different in the case of oil and water), resulting in two measurements of oil level and oil-water interface.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

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 explicitly specified otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided merely for clarity of explanation and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A capacitance guided wave magnetic composite liquid level meter for measuring the liquid level of a measured liquid, which is characterized by comprising:

a wave guide wire to which a measuring current is applied so that the wave guide wire generates a torsional wave pulse at the position of the float, and the position of the float is calculated by a time difference between a time of applying the measuring pulse current and a time of obtaining the torsional wave pulse in a magnetostrictive measuring mode so as to obtain the liquid level;

a metal outer sleeve, the waveguide wire disposed in a lumen of the metal outer sleeve; and

a magnetostrictive measurement circuit to which the torsional wave pulses are transmitted back,

2. The fluid level gauge of claim 1, wherein the metal outer sleeve is insulated from a mounting base of the fluid level gauge and a container containing a fluid.

3. The gauge of claim 1,

the gauge also comprises a circuit arrangement which,

the loop structure is a loop lead wire which is used for transmitting signals generated by the waveguide wire and is arranged in the inner cavity of the metal outer sleeve; or

The loop structure is electrically connected with the waveguide wire at the bottom of the loop structure through the metal outer sleeve to form a loop, and meanwhile, the metal outer sleeve tensions the waveguide wire at the bottom of the metal outer sleeve so as to transmit signals generated by the waveguide wire.

4. The gauge of claim 1, wherein the outer tube wall of the metal outer sleeve is provided with an insulating layer.

5. Level gauge according to any one of claims 1 to 4, characterized in that it is provided with a grounded metal tube arranged coaxially parallel to the metal outer sleeve and arranged outside the metal outer sleeve.

6. The gauge of claim 5, wherein the float is disposed outside the grounded metal tube and is movable along the grounded metal tube as the liquid level changes; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level.

7. The fluid level gauge of claim 6, wherein the grounded metal tube is a metal tube of a non-ferromagnetic material.

8. The gauge of claim 5, wherein a positioning structure is provided between the grounded metal tube and the metal outer sleeve to maintain a spacing between the grounded metal tube and the metal outer sleeve.

9. The liquid level gauge according to claim 8, wherein the grounded metal tube serves as a ground electrode in the capacitance measuring mode, and a bottom portion and/or a side portion of the grounded metal tube has an opening portion so as to equalize a liquid level between the grounded metal tube and the metal outer sleeve with a liquid level of a container containing the liquid.

10. The fluid level gauge of claim 9, wherein the mounting base of the fluid level gauge is a metal mounting base, and the grounded metal tube is connected to the metal mounting base.

11. The gauge according to any of claims 1 to 4, wherein the capacitance guided wave magnetic composite gauge is capable of measuring the liquid level by both magnetostriction measurement and capacitance measurement, and the metal outer sleeve serves as a measurement pole for capacitance measurement, and a container wall of a container containing the liquid or a separately provided grounded metal pipe serves as a ground pole, in which capacitance measurement the liquid level is obtained by measuring a change in capacitance between the metal outer sleeve and the container wall or grounded metal pipe.

12. The gauge of claim 11, wherein the grounded metal tube is coaxially disposed parallel to and outside of the metal outer sleeve.

13. The gauge of claim 12, wherein the float is disposed outside the grounded metal tube and is movable along the grounded metal tube as the liquid level changes.

14. The fluid level gauge of claim 13, wherein the grounded metal tube is a metal tube of a non-ferromagnetic material.

15. The fluid level gauge of claim 14, wherein a positioning structure is disposed between the grounded metal tube and the metal outer sleeve to maintain a spacing between the grounded metal tube and the metal outer sleeve.

16. The liquid level gauge according to claim 15, wherein the grounded metal tube serves as a ground electrode in the capacitive measurement mode, and a bottom portion and/or a side portion of the grounded metal tube has an opening portion so as to equalize a level of liquid between the grounded metal tube and the metal outer sleeve with a level of a container containing the liquid.

17. The fluid level gauge of claim 16, wherein the mounting base is a metal mounting base, and the grounded metal tube is connected to the metal mounting base.

18. The gauge of claim 11, wherein the gauge comprises a capacitance measuring circuit connected to the metal outer sleeve and the grounded metal tube or a wall of a container of the liquid.

19. The liquid level gauge according to any one of claims 1 to 4, wherein the capacitance guided wave magnetic composite liquid level gauge is capable of measuring the liquid level by means of magnetostriction measurement and guided wave radar measurement, and the metal outer sleeve serves as a metal probe of the guided wave radar, and a microwave signal is transmitted through the metal outer sleeve, and then a signal is returned along the metal outer sleeve after being reflected by the liquid level or a float, and the liquid level is obtained by a time difference between the transmitted microwave signal and the returned signal.

20. The gauge of claim 19, wherein the gauge comprises a guided wave radar measurement circuit coupled to the metal outer sleeve.

21. The gauge of claim 19, wherein the gauge is provided with a grounded metal tube disposed coaxially parallel to the metal outer sleeve and disposed outside the metal outer sleeve.

22. The gauge of claim 21, wherein the float is disposed outside the grounded metal tube and is movable along the grounded metal tube as the liquid level changes; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level.

23. The fluid level gauge of claim 21, wherein the grounded metal tube is a metal tube of a non-ferromagnetic material.

24. The fluid level gauge of claim 21, wherein a positioning structure is provided between the grounded metal tube and the outer metal sleeve to maintain a spacing between the grounded metal tube and the outer metal sleeve.

25. The fluid level gauge of claim 21, wherein liquid is admitted between the grounded metal tube and the metal outer sleeve and within the metal outer sleeve and is at a level equal to a level of liquid in a container containing the liquid.

26. The gauge according to any of the claims 1 to 4, wherein said capacitive guided wave magneto composite gauge is capable of measuring said liquid level by means of magnetostrictive, capacitive and guided wave radar measurements,

the metal outer sleeve is used as a measuring electrode for capacitance measurement, and a container wall of a container containing the liquid or a separately arranged grounding metal tube is used as a grounding electrode, and in the capacitance measurement mode, the liquid level is obtained by measuring capacitance change between the metal outer sleeve and the container wall or the grounding metal tube; in addition, the metal outer sleeve is used as a metal probe of a guided wave radar, a microwave signal is transmitted through the metal outer sleeve, then a signal is returned along the metal outer sleeve after the signal is reflected by the liquid level or a floater, and the liquid level is obtained through the time difference between the transmitted microwave signal and the returned signal.

27. The gauge of claim 26, wherein the gauge is provided with a grounded metal tube arranged coaxially parallel to the metal outer sleeve and arranged outside the metal outer sleeve.

28. The gauge of claim 27, wherein the float is disposed outside the grounded metal tube and is movable along the grounded metal tube as the liquid level changes; or the float is arranged outside the metal sleeve and can move along the metal sleeve along with the change of the liquid level.

29. The fluid level gauge of claim 27, wherein the grounded metal tube is a metal tube of a non-ferromagnetic material.

30. The fluid level gauge of claim 27, wherein a positioning structure is provided between the grounded metal tube and the metal outer sleeve to maintain a spacing between the grounded metal tube and the metal outer sleeve.

31. The fluid level gauge of claim 30, wherein the grounded metal tube acts as a ground electrode in the capacitive measurement mode, and wherein a bottom and/or side of the grounded metal tube has an apertured portion to equalize a level of fluid between the grounded metal tube and the metal outer sleeve with a level of a container containing the fluid.

32. The fluid level gauge of claim 31, wherein the mounting base of the fluid level gauge is a metal mounting base, and the grounded metal tube is connected to the metal mounting base.

33. The gauge of any one of claims 26 to 32, wherein the gauge comprises a capacitance measurement circuit connected to the metal outer sleeve and the grounded metal cylinder or the vessel wall and a guided wave radar measurement circuit connected to the metal outer sleeve.

34. The fluid level gauge of claim 33, further comprising a switching circuit to switch the capacitive measurement mode and the guided wave radar measurement mode at different times.

35. A measuring device, comprising:

the gauge of any of claims 1 to 34, wherein said gauge is capable of measuring said liquid level by at least magnetostrictive and capacitive measurements; and

36. A measuring device for measuring the water content in an oil product, comprising:

the liquid level gauge of any one of claims 1 to 34, wherein the liquid level gauge is capable of measuring the liquid level by at least magnetostrictive and capacitive measurements; and

37. The utility model provides a measuring device, measuring device is used for measuring oil water double interface, its characterized in that includes:

the gauge of any of claims 1-34, wherein the gauge is capable of measuring the liquid level by at least magnetostrictive and capacitive measurements, wherein the magnetostrictive measurement measures the oil level and the capacitive measurement measures the water level.