A sludge level detection device for a non-full pipe electromagnetic flowmeter

Abstract

The application provides a mud level detection device for a non-full pipe electromagnetic flowmeter, which comprises a conduit for fluid flow, a sensing belt and a circuit board assembly arranged on the outer wall of the conduit; the sensing belt is arranged on the fluid flow area of the inner wall of the conduit, and the sensing belt comprises a plurality of sensing probes which are uniformly distributed along the circumference of the conduit. The mud level detection device can detect the electric conductivity of different positions through the sensing probes. Since the electric conductivity of different media is different, when each pair of adjacent probes is in the same medium, the electric conductivity values are relatively close, when two adjacent probes are in different media, the relative electric conductivity values change greatly, and when the two adjacent probes are in another medium, the difference between the electric conductivity values continues to expand. By comparing these electric conductivity signals, the corresponding pair of sensing probes when the electric conductivity changes can be found, and the position of the pair of sensing probes represents the demarcation point of the mud and water, so that the accurate detection of the mud level is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic flowmeter, in particular to a mud level detection device for non-full pipe electromagnetic flowmeter. BACKGROUND

[0002] The municipal rainwater and sewage pipe network and inspection well are important components of the urban drainage system. In the use process, the silt will be deposited in the pipe network and inspection well day by day, forming the accumulated mud. Too much accumulated mud will affect the normal operation of the drainage system, reduce the pipe network volume rate, and even block the pipeline, cause sewage to overflow and form environmental pollution events, and affect the flood control safety in flood season. Formulating a reasonable dredging plan needs to provide the accumulated mud data of the pipe network inspection well as support. The pipe network is operated by the government entrusting the third party, and the operation and maintenance standards are set, such as the accumulated mud thickness of the pipe network inspection well should be within the allowable range of the pipe network diameter. It is particularly important to formulate a reasonable pipe network dredging plan according to the accumulated mud degree of the pipe network inspection well. Especially at present, many of the urban drainage pipe networks are underground non-full pipe pipelines, which belong to gravity pipelines, and it is very difficult to monitor. There are few mud level meters suitable for measuring the accumulated mud of the pipe network inspection well. The existing measuring rods are mostly long rods marked with scales or red and white alternating colors. When reading the scale, the water flow can easily dilute the traces of the silt, and the reading cannot be accurate, intuitive and effective. Moreover, the organic glass material is not suitable for the pipeline with large water flow.

[0003] In general, the main problems existing in the current sewage metering are as follows: the sewage pollutant concentration is large, the impurities are many, the silt monitoring is difficult, the sewage flowmeter maintenance and cleaning are difficult, and the labor intensity of manual dredging is large. Therefore, the market urgently needs an instrument and equipment for silt deposition detection of non-full pipe flowmeter. SUMMARY

[0004] I. Technical problems to be solved

[0005] In view of the defects in the prior art, the present application provides an ultrasonic phantom, a measuring device and a method for measuring sound pressure in the ultrasonic phantom, which solves the technical problem of inaccurate mud level detection of non-full pipe flowmeter in the prior art.

[0006] II. Technical scheme

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] A mud level detection device for non-full pipe electromagnetic flowmeter, comprising a conduit for fluid flow, and the key lies in further comprising:

[0009] A circuit board assembly is arranged on the outer wall of the conduit and is used for processing and transmitting electric signals;

[0010] A sensing belt is arranged on the fluid flow area of the inner wall of the conduit, and the sensing belt comprises a plurality of sensing probes which are uniformly distributed along the circumference of the conduit. By acquiring the conductivity between adjacent sensing probes, a pair of sensing probes corresponding to the conductivity with a large change is screened out, and the position of the pair of sensing probes is the mud level interface.

[0011] Optionally, the sensing probes are symmetrically distributed on the fluid flow area of the inner wall of the conduit.

[0012] Optionally, a sealing member for sealing the edge of the sensing probe is arranged between the sensing probe and the inner wall of the conduit, and the sealing member is connected with the inner wall of the conduit.

[0013] Optionally, the sensing belt is provided with at least two groups, and the sensing belts are uniformly distributed along the axial direction of the conduit.

[0014] Optionally, the spacing between adjacent sensing probes in the same group of sensing belts is equal.

[0015] Optionally, each sensing probe is connected with a connecting rod which is movably arranged in the wall of the conduit, the first end of the connecting rod is connected with the corresponding sensing probe, and the second end of the connecting rod is arranged outside the wall of the conduit and is electrically connected with the circuit board assembly.

[0016] The second end of the connecting rod is connected with a tensioning member which tightens the connecting rod in the direction of the outside of the conduit and tightly connects the corresponding sensing probe with the sealing member.

[0017] Optionally, the tensioning member comprises an elastic member which is sleeved on the connecting rod, one end of the elastic member is abutted against the limiting block at the second end of the connecting rod, and the other end of the elastic member is abutted against the outer wall of the conduit.

[0018] Optionally, the sealing members in the same group of sensing belts are connected as a whole to form a continuous sealing belt.

[0019] Or the sealing members of each group of sensing belts are connected as a whole to form a whole sealing belt.

[0020] Optionally, a sensor housing is arranged on the outer wall of the conduit, a mounting groove is formed on the mounting surface of the sensor housing, the circuit board assembly is arranged in the mounting groove, and the edge of the sensor housing is sealingly connected with the conduit.

[0021] The mud level detection device is also provided in the non-full conduit electromagnetic flowmeter.

[0022] III. Advantages

[0023] The application is a mud level detection device for non-full pipe electromagnetic flowmeter, which can detect the conductivity of different sites through the sensing probe. Since the conductivity of different media is different, when each pair of adjacent probes is in the same medium, the conductivity value is relatively close, while when the two adjacent probes are in different media, the relative conductivity value will change greatly, and when the two adjacent probes are in another medium, the conductivity value difference will continue to expand. By comparing these conductivity signals, the corresponding pair of sensing probes when the conductivity changes can be found, and the position of the pair of sensing probes represents the demarcation point of mud and water, that is, the mud level site, so as to realize accurate detection of mud level. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an assembly drawing of the mud level detection device for non-full pipe electromagnetic flowmeter.

[0025] Figure 2 It is an A-A sectional view of Figure 1

[0026] Figure 3 It is a structural schematic view of the mud level detection device.

[0027] Figure 4 It is an enlarged view of B in Figure 2

[0028] 1-conduit; 2-converter; 3-liquid level device; 41-ground electrode; 42-first electrode; 43-second electrode; 5-mud level detection device; 51-sensing probe; 52-seal; 53-linkage; 54-tensioning member; 55-sensor housing; 56-circuit board assembly. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0030] Unless otherwise specified, the raw materials in the application can be obtained by market purchase, and the equipment used in the application can adopt the conventional equipment in the field or refer to the existing technology in the field.

[0031] It should be noted that:

[0032] Please refer to the accompanying Figure 1 and 2 ​​As shown in the figure, the non-full pipe electromagnetic flowmeter generally comprises a conduit 1 for fluid flow, electrodes arranged in the conduit 1 and used for inducing electromotive force, a converter 2 used for forming a uniform magnetic circuit system and amplifying the induced electromotive force signal between the electrodes, and a liquid level device 3 used for measuring the liquid level in the conduit 1. The electrodes comprise a grounding electrode 41, a first electrode 42 and a second electrode 43. The grounding electrode 41 is used for removing static electricity inside the conduit 1 and preventing drift when collecting signals. The first electrode 42 corresponds to the second electrode 43, and the two form a relatively closed magnetic field.

[0033] Please refer to the accompanying drawings Figure 1 and 2 As shown in the figure, the non-full pipe electromagnetic flowmeter generally comprises a conduit 1 for fluid flow, electrodes arranged in the conduit 1 and used for inducing electromotive force, a converter 2 used for forming a uniform magnetic circuit system and amplifying the induced electromotive force signal between the electrodes, and a liquid level device 3 used for measuring the liquid level in the conduit 1. The electrodes comprise a grounding electrode 41, a first electrode 42 and a second electrode 43. The grounding electrode 41 is used for removing static electricity inside the conduit 1 and preventing drift when collecting signals. The first electrode 42 corresponds to the second electrode 43, and the two form a relatively closed magnetic field.

[0034] Figure 2 A structure diagram of a mud level detection device for a non-full pipe electromagnetic flowmeter is shown in an exemplary embodiment of the present application.

[0035] Please refer to the accompanying drawings Figure 2 and 3As shown: based on the above exemplary non-full tube electromagnetic flowmeter, the mud level detection device is arranged on the non-full tube electromagnetic flowmeter, the mud level detection device 5 includes a conduit 1 shared with the non-full tube electromagnetic flowmeter, a sensing belt arranged in the fluid flow area of the inner wall of the conduit 1, a sealing element 52 arranged between the sensing belt and the inner wall of the conduit 1 and used for sealing the sensing belt, and a sensor housing 55 arranged on the outer wall of the conduit 1. At least two groups of the sensing belt are distributed along the axial direction of the conduit 1, and the sensing belt includes a plurality of sensing probes 51 uniformly distributed along the circumferential direction of the conduit 1. The sealing element 52 is connected with the inner wall of the conduit 1. The mounting surface of the sensor housing 55 and the conduit 1 is provided with a mounting groove, and the mounting groove is provided with a circuit board assembly 56 used for receiving and transmitting signals. The sensing probe 51 is electrically connected with the circuit board assembly 56, and the edge of the sensor housing 55 is sealingly connected with the conduit 1.

[0036] Please refer to the accompanying drawings Figure 2 As shown: the sensing probes 51 of the same group of the sensing belt are symmetrically distributed in the fluid flow area of the inner wall of the conduit 1. The sensing probes 51 are uniformly distributed along the circumferential direction of the conduit 1, and a pair of sensing probes corresponding to a larger change in electrical conductivity is screened by acquiring the electrical conductivity between adjacent sensing probes, and the position of the pair of sensing probes is the mud level interface.

[0037] Please refer to the accompanying drawings

[0038] Please refer to the accompanying drawings: the sensing probes 51 are uniformly distributed along the circumferential direction of the conduit 1, and a pair of sensing probes corresponding to a larger change in electrical conductivity is screened by acquiring the electrical conductivity between adjacent sensing probes, and the position of the pair of sensing probes is the mud level interface.

[0039] In addition, the sealing elements 52 in the same group of the sensing belt are connected as a whole to form a continuous sealing belt. Of course, the sealing elements 52 of each group of the sensing belt can also be connected as a whole to form a whole sealing belt. As long as it is convenient to install and ensure the sealing effect.

[0040] Please see the appendix Figure 1 and 2 As shown: By applying voltage to adjacent sensor probes 51 within the same group of sensor strips, the conductivity at that location can be measured. Different media have different conductivities. During measurement, starting with the two sensor probes at the bottom, the measurement is performed symmetrically on both sides. In each group of sensor strips, only one pair of adjacent sensor probes 51 is voltageed at a time, and the test is carried out sequentially from the inside out, thus obtaining multiple sets of conductivity signals. When each pair of adjacent sensor probes 51 is in the same medium, the conductivity values ​​are relatively close. However, when the sensor probes 51 are in different media, the conductivity values ​​change significantly. When the sensor probes 51 are in another medium, the difference in conductivity values ​​continues to widen. By comparing these conductivity signals, the pair of sensor probes 51 corresponding to the change in conductivity can be identified. The position of this pair of sensor probes 51 represents the boundary between mud and liquid, thus enabling the measurement of the mud level.

[0041] Multiple sets of sensor belts are used for synchronous detection, and the detection results of each set of sensor belts are combined to reduce the error in mud level detection.

[0042] Please see the appendix Figure 2 As shown: The impedance signal between adjacent sensing probes 51 in the same group is first amplified by the amplifier circuit in the circuit board assembly 56. The amplified signal is then filtered by the filter circuit to remove unwanted interference signals. Finally, it enters the capacitive coupling circuit of the circuit board assembly 56, is rectified, and then transmitted externally or connected to the converter 2. Finally, it is transmitted to the CPU in the form of a digital signal, and the CPU stores it in a register. In this way, the acquisition of a set of signals is completed. After the signal acquisition is completed, the CPU, under the control of the software program, compares the acquired signal and matches it with the corresponding sensing probe 51. Finally, the detection of the mud level signal is completed under the operation of the software program.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sludge level detection device for a non-full pipe electromagnetic flowmeter comprising a conduit for the passage of a fluid flow, characterised in that, Also included are: A circuit board assembly is provided on the outer wall of the conduit and used for processing and transmitting electrical signals; a sensing belt is provided on the fluid flow area of the inner wall of the conduit, the sensing belt includes a plurality of sensing probes uniformly distributed along the circumference of the conduit, by acquiring the electrical conductivity between adjacent sensing probes, a pair of sensing probes corresponding to the electrical conductivity with large changes is screened out, and the position of the pair of sensing probes is taken as the mud level interface; Each of the sensing probes is connected with a connecting rod, the connecting rod is movably arranged in the pipe wall of the conduit, the first end of the connecting rod is connected with the corresponding sensing probe, and the second end of the connecting rod is arranged outside the outer wall of the conduit and is electrically connected with the circuit board assembly; The second end of the connecting rod is connected with a tensioning member, the tensioning member tightens the connecting rod in the direction of the outside of the conduit and tightly connects the corresponding sensing probe with a sealing member.

2. The sludge level detection apparatus for a non-full pipe electromagnetic flowmeter according to claim 1, characterized by: The sensing probes are symmetrically distributed on the fluid flow area of the inner wall of the conduit.

3. A sludge level detection apparatus for a non-full pipe electromagnetic flow meter according to claim 2, characterized in that: A sealing member is arranged between the sensing probes and the inner wall of the conduit for sealing the edges of the sensing probes, and the sealing member is connected with the inner wall of the conduit.

4. The mud level detection apparatus for a non-full pipe electromagnetic flow meter according to claim 3, characterized in that: The sensing belt is provided with at least two groups, and the sensing belts are uniformly distributed along the axial direction of the conduit.

5. A mud level detection apparatus for a non-full pipe electromagnetic flow meter as claimed in claim 4, wherein: The spacing between adjacent sensing probes in the same group of sensing belts is equal.

6. A mud level detection apparatus for a non-full pipe electromagnetic flow meter as claimed in claim 5, wherein: The tensioning member includes an elastic member sleeved on the connecting rod, one end of the elastic member abuts against a limiting block at the second end of the connecting rod, and the other end of the elastic member abuts against the outer wall of the conduit.

7. The mud level detection apparatus for a non-full pipe electromagnetic flow meter of claim 4, wherein: The sealing members in the same group of sensing belts are connected as a whole to form a continuous sealing belt; or the sealing members of each group of sensing belts are connected as a whole to form a whole sealing belt.

8. A sludge level detection apparatus for a non-full pipe electromagnetic flowmeter according to any one of claims 1 to 7, characterized in that: A sensor housing is arranged on the outer wall of the conduit, a mounting groove is formed on the mounting surface of the sensor housing, the circuit board assembly is arranged in the mounting groove, and the edge of the sensor housing is sealingly connected with the conduit.

9. A non-full pipe electromagnetic flow meter characterized by: The mud level detection device of any one of claims 1-8 is included.

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