Plug-in type right-angle bent pipe type electromagnetic flowmeter

Abstract

The utility model discloses a plug-in type right-angle bent pipe type electromagnetic flow meter which comprises an electromagnetic flow sensor, an electromagnetic flow converter and a double-circuit power supply module arranged in a redundancy mode, and the electromagnetic flow sensor is connected with the electromagnetic flow converter. The dual-path power supply module comprises a main power supply circuit, a standby power supply circuit, a power supply monitoring circuit, a dual-power supply switching circuit and a voltage conversion circuit, and the power supply output ends of the main power supply circuit and the standby power supply circuit are connected with the voltage conversion circuit through the dual-power supply switching circuit; the power output end of the main power supply circuit is further connected with the signal input end of the power supply monitoring circuit, the signal output end of the power supply monitoring circuit is connected with the signal input end of the dual-power-supply switching circuit, and the output end of the voltage conversion circuit is connected with the power input end of the electromagnetic flow sensor and the power input end of the electromagnetic flow converter. According to the utility model, the integrity of metering data and the accuracy of metering results of the plug-in type right-angle elbow type electromagnetic flowmeter can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flow detection, in particular to an insertion type right-angle elbow type electromagnetic flowmeter. Background Art

[0002] Flow measurement is one of the important components of metrology science and technology, and it also plays a pivotal role in industrial production. The tool for flow measurement is the flow meter, which can be divided into ultrasonic flow meters, turbine flow meters, vortex flow meters and electromagnetic flow meters according to their working principles. Among them, the electromagnetic flow meter is a flow meter that measures the volume flow of conductive fluids based on Faraday's law of electromagnetic induction, and is the most widely used in social production and life.

[0003] With the development of electromagnetic flowmeters, many types of electromagnetic flowmeters have been derived, and the insertion electromagnetic flowmeter is one of them. Based on the working principle of the electromagnetic flowmeter, it measures the flow velocity at a certain point in the flow field distribution inside the pipeline, and then derives the average flow velocity of the entire pipeline section based on the flow velocity at this point, and finally obtains the flow size.

[0004] Insertion electromagnetic flowmeter is composed of insertion electromagnetic flow sensor and insertion electromagnetic flow converter, which is used to measure the volume flow of various conductive liquids in pipelines. Traditional insertion electromagnetic flowmeter is generally a straight tube electromagnetic flowmeter, the height of the whole flowmeter is relatively high, it has strict requirements on the installation site, and the installation space is relatively large, so it cannot be used in industrial sites with limited installation space.

[0005] In order to solve this problem, an insertion type right angle elbow type electromagnetic flowmeter came into being. The insertion type right angle elbow type electromagnetic flowmeter occupies a small space and is suitable for installation and use in a small space.

[0006] However, the existing insertion right-angle elbow type electromagnetic flowmeter usually adopts a single power supply mode of AC power supply or battery power supply. When the single power supply fails, the electromagnetic flowmeter cannot measure the flow normally, resulting in the loss of measurement data during the power failure period, affecting the accuracy of the measurement results. Utility Model Content

[0007] In view of the defects in the prior art, the utility model aims to provide an insertable right-angle elbow type electromagnetic flowmeter capable of uninterrupted power supply, thereby effectively ensuring the integrity of the metering data and the accuracy of the metering results of the insertable right-angle elbow type electromagnetic flowmeter.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides an insertion type right angle elbow type electromagnetic flowmeter, comprising an electromagnetic flow sensor, an electromagnetic flow converter and a redundant dual-way power supply module, wherein the signal output end of the electromagnetic flow sensor is connected to the signal input end of the electromagnetic flow converter, wherein:

[0010] The dual-power supply module includes a main power supply circuit, a backup power supply circuit, a power supply monitoring circuit, a dual power supply switching circuit and a voltage conversion circuit.

[0011] The power output ends of the main power supply circuit and the backup power supply circuit are connected to the voltage conversion circuit through the dual power supply switching circuit, the power output end of the main power supply circuit is also connected to the signal input end of the power supply monitoring circuit, the signal output end of the power supply monitoring circuit is connected to the signal input end of the dual power supply switching circuit, and the output end of the voltage conversion circuit is respectively connected to the power input end of the electromagnetic flow sensor and the electromagnetic flow converter;

[0012] The power supply monitoring circuit is used to monitor the power supply status of the main power supply circuit;

[0013] The dual power supply switching circuit is used to switch the current power supply circuit from the main power supply circuit to the backup power supply circuit when a power supply failure occurs in the main power supply circuit, and to switch the current power supply circuit from the backup power supply circuit to the main power supply circuit when the main power supply circuit resumes normal power supply;

[0014] The voltage conversion circuit is used to convert the power supply voltage input by the dual power supply switching circuit into the working voltage required by the electromagnetic flow sensor and the electromagnetic flow converter.

[0015] Preferably, the power supply monitoring circuit includes a voltage signal acquisition circuit, a comparator and a threshold memory, the signal input end of the voltage signal acquisition circuit is connected to the power output end of the main power supply circuit and the backup power supply circuit, the signal output end of the voltage signal acquisition circuit is connected to the first signal input end of the comparator, the threshold memory is connected to the second signal input end of the comparator, and the output end of the comparator is connected to the signal input end of the dual power supply switching circuit, wherein,

[0016] The voltage signal acquisition circuit is used to acquire the supply voltage of the main power supply circuit, the threshold memory is used to store the threshold voltage, the comparator is used to compare the supply voltage with the threshold voltage, and output a corresponding level signal to the dual power switching circuit according to the comparison result.

[0017] Preferably, the main power supply circuit includes a step-down circuit, a rectifier circuit, a filter circuit and a voltage stabilizing circuit connected in sequence, the power input end of the step-down circuit is connected to the AC power, and the output end of the voltage stabilizing circuit is connected to the first power input end of the dual power switching circuit.

[0018] Preferably, the backup power supply circuit includes a photovoltaic component, a rechargeable battery and a charge and discharge controller, the photovoltaic component and the rechargeable battery are respectively connected to the charge and discharge controller, and the charge and discharge controller is connected to the second power input terminal of the dual power switching circuit.

[0019] Preferably, the rechargeable battery is a lithium-ion battery.

[0020] Preferably, the voltage conversion circuit has at least two power output terminals, and the output voltages of the at least two power output terminals are different.

[0021] Preferably, the dual power switching circuit comprises a relay and a current limiting resistor, wherein:

[0022] One end of the coil of the relay is connected to the power output end of the main power supply circuit, the other end of the relay coil is grounded through the current limiting resistor, one end of the normally closed contact of the relay is connected to the output end of the main power supply circuit, the other end of the normally closed contact of the relay is connected to the input end of the voltage conversion circuit, one end of the normally open contact of the relay is connected to the power output end of the backup power supply circuit, and the other end of the normally open contact of the relay is connected to the input end of the voltage conversion circuit.

[0023] Preferably, the electromagnetic flow converter comprises a low-pass filter circuit, a first signal amplifying circuit, a second signal amplifying circuit, an analog-to-digital conversion circuit, a processor and a display module which are connected in sequence.

[0024] Preferably, the insertion type right-angle elbow type electromagnetic flowmeter further includes a pressure sensor, a temperature sensor, a first signal conditioning circuit and a second signal conditioning circuit.

[0025] The signal output end of the pressure sensor is connected to the signal input end of the first signal conditioning circuit, the signal output end of the temperature sensor is connected to the signal input end of the second signal conditioning circuit, and the signal output ends of the first signal conditioning circuit and the second signal conditioning circuit are respectively connected to the processor.

[0026] Preferably, the processor adopts 89C52 single chip microcomputer.

[0027] The utility model arranges an electromagnetic flow sensor, an electromagnetic flow converter and a redundant dual-way power supply module. The dual-way power supply module is provided with a main power supply circuit, a backup power supply circuit, a power supply monitoring circuit, a dual-power supply switching circuit and a voltage conversion circuit. The power supply voltage input by the dual-power supply switching circuit is converted into a working voltage required by the electromagnetic flow sensor and the electromagnetic flow converter through the voltage conversion circuit. The power supply monitoring circuit monitors the power supply status of the main power supply circuit. When a power supply failure occurs in the main power supply circuit, the dual-power supply switching circuit switches the current power supply circuit from the main power supply circuit to the backup power supply circuit. When the output voltage of the main power supply circuit returns to normal, the dual-power supply switching circuit switches the current power supply circuit from the backup power supply circuit to the main power supply circuit, thereby ensuring uninterrupted power supply to the electromagnetic flow sensor and the electromagnetic flow converter, and effectively ensuring the integrity of the metering data of the plug-in right-angle elbow type electromagnetic flowmeter and the accuracy of the metering result.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a circuit principle block diagram of an insertion right-angle elbow type electromagnetic flowmeter in one embodiment of the utility model. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] like Figure 1As shown, an embodiment of the utility model provides an insertable right-angle elbow type electromagnetic flowmeter, including an electromagnetic flow sensor 1, an electromagnetic flow converter 2 and a redundant dual-way power supply module 3, the signal output end of the electromagnetic flow sensor 1 is connected to the signal input end of the electromagnetic flow converter 2, the dual-way power supply module 3 includes a main power supply circuit 31, a backup power supply circuit 32, a power supply monitoring circuit 33, a dual power supply switching circuit 34 and a voltage conversion circuit 35, the power output ends of the main power supply circuit 31 and the backup power supply circuit 32 are connected to the voltage conversion circuit 35 through the dual power supply switching circuit 34, the power output end of the main power supply circuit 31 is also connected to the signal input end of the power supply monitoring circuit 33, the signal output end of the power supply monitoring circuit 33 is connected to the signal input end of the dual power supply switching circuit 34, and the output end of the voltage conversion circuit 35 is respectively connected to the power input end of the electromagnetic flow sensor 1 and the electromagnetic flow converter 2.

[0038] Specifically, the voltage conversion circuit 35 is used to convert the power supply voltage input by the dual power supply switching circuit 34 into the working voltage required by the electromagnetic flow sensor 1 and the electromagnetic flow converter 2, and the power supply monitoring circuit 33 is used to monitor the power supply status of the main power supply circuit 31; the dual power supply switching circuit 34 is used to switch the current power supply circuit from the main power supply circuit 31 to the backup power supply circuit 32 when a power supply failure occurs in the main power supply circuit 31, and when the main power supply circuit 31 resumes normal power supply, the current power supply circuit is switched from the backup power supply circuit 32 to the main power supply circuit 31.

[0039] The working principle of the insertion right-angle elbow type electromagnetic flowmeter of this embodiment is as follows:

[0040] When the output of the main power supply circuit 31 is normal, the dual power supply switching circuit 34 controls the main power supply circuit 31 to be connected with the voltage conversion circuit 35. The voltage conversion circuit 35 converts the power supply voltage input by the dual power supply switching circuit 34 into the working voltage required by the electromagnetic flow sensor 1 and the electromagnetic flow converter 2, so that the electromagnetic flow sensor 1 and the electromagnetic flow converter 2 are powered by the main power supply circuit 31. The electromagnetic flowmeter converts the flow velocity of the fluid in the target pipe body into a corresponding electrical signal based on the electromagnetic induction principle. The electromagnetic flow converter 2 performs analog-to-digital conversion and analysis processing on the electrical signal output by the electromagnetic flowmeter, and outputs corresponding flow information. During the operation of the electromagnetic flowmeter, the power supply status of the main power supply circuit 31 is monitored in real time by the power supply monitoring circuit 33. When a power supply failure occurs in the main power supply circuit 31, the dual power supply switching circuit 34 switches the current power supply circuit from the main power supply circuit 31 to the backup power supply circuit 32. When the output voltage of the main power supply circuit 31 returns to normal, the dual power supply switching circuit 34 switches the current power supply circuit from the backup power supply circuit 32 to the main power supply circuit 31.

[0041] The insertion type right-angle elbow type electromagnetic flowmeter of this embodiment can effectively ensure uninterrupted power supply to the electromagnetic flow sensor 1 and the electromagnetic flow converter 2, and effectively ensure the integrity of the metering data of the insertion type right-angle elbow type electromagnetic flowmeter and the accuracy of the metering results.

[0042] In one embodiment, the power supply monitoring circuit 33 includes a voltage signal acquisition circuit 331, a comparator 332 and a threshold memory 333. The signal input end of the voltage signal acquisition circuit 331 is connected to the power output end of the main power supply circuit 31 and the backup power supply circuit 32. The signal output end of the voltage signal acquisition circuit 331 is connected to the first signal input end of the comparator 332. The threshold memory 333 is connected to the second signal input end of the comparator 332. The output end of the comparator 332 is connected to the signal input end of the dual power switching circuit 34.

[0043] The voltage signal acquisition circuit 331 is used to acquire the supply voltage of the main power supply circuit 31, the threshold memory 333 is used to store the threshold voltage, and the comparator 332 is used to compare the supply voltage with the threshold voltage and output the corresponding level signal to the dual power switching circuit 34 according to the comparison result.

[0044] In this embodiment, the power supply voltage of the main power supply circuit 31 is collected in real time by the voltage signal acquisition circuit 331, and the collected power supply voltage is transmitted to the comparator 332. The comparator 332 compares the collected power supply voltage with the threshold voltage in the threshold memory 333, and outputs the corresponding level signal to the dual power switching circuit 34 according to the comparison result. Specifically, the threshold voltage can be set according to the minimum voltage required by the voltage conversion circuit 35. For example, the threshold voltage can be set to 5V. When the power supply voltage of the main power supply circuit 31 collected by the voltage signal acquisition circuit 331 is lower than 5V, it means that a power supply failure has occurred in the main power supply circuit 31. At this time, the voltage output by the main power supply circuit 31 cannot guarantee the normal operation of the electromagnetic flow sensor 1 and the electromagnetic flow converter 2 of the inserted right-angle elbow type electromagnetic flowmeter. The comparator 332 outputs a high-level signal to the dual power supply switching circuit 34, and the dual power supply switching circuit 34 switches the current power supply circuit from the main power supply circuit 31 to the backup power supply circuit 32. Afterwards, when the output voltage of the main power supply circuit 31 returns to normal, that is, the output voltage is greater than or equal to 5V, the dual power supply switching circuit 34 switches the current power supply circuit from the backup power supply circuit 32 to the main power supply circuit 31.

[0045] In one embodiment, the main power supply circuit 31 includes a step-down circuit 311, a rectifier circuit 312, a filter circuit 313 and a voltage stabilizing circuit 314 connected in sequence, the power input end of the step-down circuit 311 is connected to the AC power, and the output end of the voltage stabilizing circuit 314 is connected to the first power input end of the dual power switching circuit 34.

[0046] In this embodiment, the main power supply circuit 31 is powered by AC power, which is convenient to obtain power and more stable and reliable. The 220V AC power of the AC power passes through the step-down circuit 311, the rectifier circuit 312, the filter circuit 313 and the voltage stabilizing circuit 314 in sequence, and then outputs a stable low-voltage DC power through the dual power switching circuit 34 to power the electromagnetic flow sensor 1 and the electromagnetic flow converter 2.

[0047] In one embodiment, the backup power supply circuit 32 includes a photovoltaic component 321, a rechargeable battery 322 and a charge and discharge controller 323, the photovoltaic component 321 and the rechargeable battery 322 are respectively connected to the charge and discharge controller 323, and the charge and discharge controller 323 is connected to the second power input terminal of the dual power switching circuit 34.

[0048] In this embodiment, a rechargeable battery 322 is used as a backup power source, and the rechargeable battery 322 is charged by the photovoltaic module 321, which effectively ensures that the battery is sufficiently charged, thereby ensuring the reliability of the power supply of the backup power supply circuit 32.

[0049] Specifically, in this embodiment, the rechargeable battery 322 is a lithium-ion battery. The lithium-ion battery has a high energy density, can provide a large amount of power output, and has a fast charging speed, and can be fully charged in a very short time. In addition, the lithium-ion battery has a long service life and good safety performance, so the power supply reliability of the backup power supply circuit 32 can be better guaranteed.

[0050] In one embodiment, the voltage conversion circuit 35 has at least two power output terminals, and the output voltages of at least two power output terminals are different. Since the working voltages required by the components in the electromagnetic flow sensor 1 and the electromagnetic flow converter 2 usually have multiple voltages (such as 3.3V, 5V, etc.), therefore, by setting multiple power output terminals with different output voltages in the voltage conversion circuit 35, it is convenient to provide multiple different working voltages for the electromagnetic flow sensor 1 and the electromagnetic flow converter 2, so as to better meet the power supply requirements.

[0051] In one embodiment, the dual power switching circuit 34 includes a relay 341 and a current limiting resistor 342, wherein:

[0052] One end of the coil KA of the relay 341 is connected to the power output end of the main power supply circuit 31, the other end of the coil KA of the relay 341 is grounded through the current limiting resistor 342, one end of the normally open contact K2 of the relay 341 is connected to the output end of the main power supply circuit 31, the other end of the normally open contact K2 of the relay 341 is connected to the input end of the voltage conversion circuit 35, one end of the normally closed contact K1 of the relay 341 is connected to the power output end of the backup power supply circuit 32, and the other end of the normally closed contact K1 of the relay 341 is connected to the input end of the voltage conversion circuit 35.

[0053] Specifically, in this embodiment, the dual power supply switching circuit 34 is composed of a relay 341 and a current limiting resistor 342, which has a simple structure, low cost and reliable switching.

[0054] When the main power supply circuit 31 is supplying power normally, the power supply monitoring circuit 33 outputs a low level. At this time, the coil KA of the relay 341 loses power, the normally closed contact K1 of the relay 341 is closed, and the normally open contact K2 is disconnected. Therefore, the connection between the main power supply circuit 31 and the voltage conversion circuit 35 is closed, and the connection between the backup power supply circuit 32 and the voltage conversion circuit 35 is disconnected, so that the electromagnetic flow sensor 1 and the electromagnetic flow converter 2 are powered by the main power supply circuit 31;

[0055] When a power supply failure occurs in the main power supply circuit 31, the power supply monitoring circuit 33 outputs a high level. At this time, the coil KA of the relay 341 is energized, the normally closed contact K1 of the relay 341 is disconnected, and the normally open contact K2 is closed. Therefore, the connection between the main power supply circuit 31 and the voltage conversion circuit 35 is disconnected, and the connection between the backup power supply circuit 32 and the voltage conversion circuit 35 is closed, thereby completing the switching of the current power supply circuit from the main power supply circuit 31 to the backup power supply circuit 32.

[0056] When the power supply fault of the main power supply circuit 31 is repaired, that is, when the main power supply circuit 31 resumes normal power supply, the power supply monitoring circuit 33 outputs a low level. At this time, the coil KA of the relay 341 loses power, the normally closed contact K1 of the relay 341 is closed, and the normally open contact K2 is disconnected. Therefore, the connection between the main power supply circuit 31 and the voltage conversion circuit 35 is closed, and the connection between the backup power supply circuit 32 and the voltage conversion circuit 35 is disconnected, thereby completing the switching of the current power supply circuit from the backup power supply circuit 32 to the main power supply circuit 31.

[0057] In one embodiment, the electromagnetic flow converter 2 includes a low-pass filter circuit 21, a first signal amplifying circuit 22, a second signal amplifying circuit 23, an analog-to-digital conversion circuit 24, a processor 25 and a display module 26 which are connected in sequence.

[0058] Specifically, in this embodiment, for the weak electrical signal output by the electromagnetic flow sensor 1, the high frequency and stray useless interference signals in the electrical signal output by the electromagnetic flow sensor 1 are first filtered out by the low-pass filter circuit 21, and then the filtered weak electrical signal is amplified in multiple stages by the first signal amplification circuit 22 and the second signal amplification circuit 23, so that the weak electrical signal is converted into a stable analog voltage signal and output to the analog-to-digital conversion circuit 24, and then converted into a digital signal recognizable by the processor 25 of the electromagnetic flowmeter after analog-to-digital conversion and output to the processor 25 for flow analysis and processing, and the flow information obtained by the analysis is displayed by the display module 26. Specifically, in this embodiment, the processor 25 adopts an 89C52 single-chip microcomputer.

[0059] In one embodiment, the insertion type right angle elbow type electromagnetic flowmeter further includes a pressure sensor 4, a temperature sensor 5, a first signal conditioning circuit 6 and a second signal conditioning circuit 7.

[0060] The signal output end of the pressure sensor 4 is connected to the signal input end of the first signal conditioning circuit 6, the signal output end of the temperature sensor 5 is connected to the signal input end of the second signal conditioning circuit 7, and the signal output ends of the first signal conditioning circuit 6 and the second signal conditioning circuit 7 are respectively connected to the processor 25.

[0061] In this embodiment, a pressure sensor 4 and a temperature sensor 5 are provided to detect the temperature signal and pressure signal of the fluid in the target pipe body. The detected temperature signal and pressure signal are respectively processed by a first signal conditioning circuit 6 and a second signal conditioning circuit 7 for signal amplification and analog-to-digital conversion, and then output to a processor 25. The processor 25 controls the display module 26 to display the current temperature and pressure on the one hand, and performs temperature and pressure compensation on the output signal of the electromagnetic flow sensor 1 according to the temperature and pressure to obtain the final flow information, thereby effectively improving the accuracy of the flow detection result.

[0062] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An insertion type right angle elbow type electromagnetic flowmeter, characterized in that: It includes an electromagnetic flow sensor, an electromagnetic flow converter and a redundant dual-way power supply module, wherein the signal output end of the electromagnetic flow sensor is connected to the signal input end of the electromagnetic flow converter, wherein: The dual-power supply module includes a main power supply circuit, a backup power supply circuit, a power supply monitoring circuit, a dual power supply switching circuit and a voltage conversion circuit. The power output ends of the main power supply circuit and the backup power supply circuit are connected to the voltage conversion circuit through the dual power supply switching circuit, the power output end of the main power supply circuit is also connected to the signal input end of the power supply monitoring circuit, the signal output end of the power supply monitoring circuit is connected to the signal input end of the dual power supply switching circuit, and the output end of the voltage conversion circuit is respectively connected to the power input end of the electromagnetic flow sensor and the electromagnetic flow converter; The power supply monitoring circuit is used to monitor the power supply status of the main power supply circuit; The dual power supply switching circuit is used to switch the current power supply circuit from the main power supply circuit to the backup power supply circuit when a power supply failure occurs in the main power supply circuit, and to switch the current power supply circuit from the backup power supply circuit to the main power supply circuit when the main power supply circuit resumes normal power supply; The voltage conversion circuit is used to convert the power supply voltage input by the dual power supply switching circuit into the working voltage required by the electromagnetic flow sensor and the electromagnetic flow converter.

2. The insertion type right angle elbow type electromagnetic flowmeter according to claim 1, characterized in that: The power supply monitoring circuit includes a voltage signal acquisition circuit, a comparator and a threshold memory, the signal input end of the voltage signal acquisition circuit is connected to the power output end of the main power supply circuit and the backup power supply circuit, the signal output end of the voltage signal acquisition circuit is connected to the first signal input end of the comparator, the threshold memory is connected to the second signal input end of the comparator, and the output end of the comparator is connected to the signal input end of the dual power supply switching circuit, wherein, The voltage signal acquisition circuit is used to acquire the supply voltage of the main power supply circuit, the threshold memory is used to store the threshold voltage, the comparator is used to compare the supply voltage with the threshold voltage, and output a corresponding level signal to the dual power switching circuit according to the comparison result.

3. The insertion type right angle elbow type electromagnetic flowmeter according to claim 2, characterized in that: The main power supply circuit includes a step-down circuit, a rectifier circuit, a filter circuit and a voltage stabilizing circuit connected in sequence. The power input end of the step-down circuit is connected to the mains, and the output end of the voltage stabilizing circuit is connected to the first power input end of the dual power switching circuit.

4. The insertion type right angle elbow type electromagnetic flowmeter according to claim 2, characterized in that: The backup power supply circuit includes a photovoltaic component, a rechargeable battery and a charge and discharge controller. The photovoltaic component and the rechargeable battery are respectively connected to the charge and discharge controller, and the charge and discharge controller is connected to the second power input terminal of the dual power switching circuit.

5. The insertion type right angle elbow type electromagnetic flowmeter according to claim 4, characterized in that: The rechargeable battery is a lithium-ion battery.

6. The insertion type right angle elbow type electromagnetic flowmeter according to claim 1, characterized in that: The voltage conversion circuit has at least two power output terminals, and the output voltages of the at least two power output terminals are different.

7. The insertion type right angle elbow type electromagnetic flowmeter according to claim 1, characterized in that: The dual power switching circuit includes a relay and a current limiting resistor, wherein: One end of the coil of the relay is connected to the power output end of the main power supply circuit, the other end of the relay coil is grounded through the current limiting resistor, one end of the normally closed contact of the relay is connected to the output end of the main power supply circuit, the other end of the normally closed contact of the relay is connected to the input end of the voltage conversion circuit, one end of the normally open contact of the relay is connected to the power output end of the backup power supply circuit, and the other end of the normally open contact of the relay is connected to the input end of the voltage conversion circuit.

8. The insertion type right angle elbow type electromagnetic flowmeter according to any one of claims 1 to 7, characterized in that: The electromagnetic flow converter comprises a low-pass filter circuit, a first signal amplifying circuit, a second signal amplifying circuit, an analog-to-digital conversion circuit, a processor and a display module which are connected in sequence.

9. The insertion type right angle elbow type electromagnetic flowmeter according to claim 8, characterized in that: Also includes a pressure sensor, a temperature sensor, a first signal conditioning circuit and a second signal conditioning circuit, The signal output end of the pressure sensor is connected to the signal input end of the first signal conditioning circuit, the signal output end of the temperature sensor is connected to the signal input end of the second signal conditioning circuit, and the signal output ends of the first signal conditioning circuit and the second signal conditioning circuit are respectively connected to the processor.

10. The insertion type right angle elbow type electromagnetic flowmeter according to claim 9, characterized in that: The processor adopts 89C52 single chip microcomputer.

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