Plug-in type non-full pipe electromagnetic flowmeter

Abstract

The invention relates to the technical field of electromagnetic flow meters, and discloses a plug-in type non-full pipe electromagnetic flow meter which comprises a mounting support, an electromagnetic flow meter body, a plurality of limiting mechanisms, an air pump, a wrapping type telescopic mechanism and a filtering type scraping mechanism, and the filtering type scraping mechanism comprises a filtering assembly and an expansion type scraping assembly connected to the filtering assembly. When the expansion type scraping assembly is in an expansion state, the area among the outer surfaces of the mounting bracket, the coating type telescopic mechanism, the filtering type scraping mechanism and the measuring assembly is communicated with the internal space of the to-be-measured pipeline only through the filtering assembly; the plug-in type electromagnetic flowmeter can be directly installed at the position of a detection opening of a pipeline, the cost is far lower than that of a pipeline type non-full-pipe electromagnetic flowmeter, in the using process, the outer surface of a measuring assembly of the electromagnetic flowmeter can be automatically cleaned, impurities in water are prevented from being attached to the surface of the electromagnetic flowmeter to form an adhesive layer, and in the cleaning process, the electromagnetic flowmeter is not prone to falling off. And the continuous work and the data acquisition precision of the measurement assembly are not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic flowmeters, and more specifically, it relates to an insertion type non-full pipe electromagnetic flowmeter. Background Art

[0002] At present, a non-full pipe electromagnetic flowmeter on the market is an electromagnetic flow sensor with a built-in capacitive liquid level measurement system, which is of a pipeline type. The flow rate Q(t) flows through the measurement conduit: Q(t) = v(t) * A(t), where v(t) is the flow velocity of the liquid medium, and A(t) is the wetted cross-sectional area of the measurement conduit. The flow velocity of the liquid medium is measured based on Faraday's electromagnetic induction principle, and the wetted cross-sectional area is calculated by combining the capacitive liquid level measurement system with the known inner diameter of the pipeline.

[0003] Conventional non-full pipe electromagnetic flowmeters are installed in a flange pipeline type. Since the usage scenarios of non-full pipe electromagnetic flowmeters are generally of large diameters, conventional non-full pipe electromagnetic flowmeters are all of large diameters, with relatively high manufacturing costs and difficult installation. Moreover, after the capacitive liquid level gauge has been in water for a long time, a layer of impurities present in the water may adhere to its outer surface. The thickness of this layer of impurities increases with time, which will have a significant impact on its measurement accuracy, resulting in systematic deviation or random fluctuation of the liquid level data, and ultimately affecting the accuracy and reliability of flow measurement. Summary of the Invention

[0004] The purpose of the present invention is to provide an insertion type non-full pipe electromagnetic flowmeter to solve the above problems.

[0005] The present invention provides an insertion type non-full pipe electromagnetic flowmeter, including: An installation bracket, which is welded to the inner wall of the pipeline to be measured, and an installation hole is provided at the middle position of the installation bracket; An electromagnetic flow measurement mechanism, which includes a measurement component and a lead wire connected to the measurement component. The lead wire passes through the pipeline to be measured and is connected to a control terminal, and the measurement component is arranged at the installation hole; A plurality of limiting mechanisms, which are evenly distributed on the upper end surface of the installation bracket, and are all used for limiting and clamping the measurement component; An air pump, which is connected to the upper end surface of the installation bracket, and the input end of the air pump is communicated with the internal space of the pipeline to be measured; A covering type telescopic mechanism, which is connected to the lower end surface of the installation bracket, and the covering type telescopic mechanism is sleeved outside the measurement component, and the internal space of the covering type telescopic mechanism is connected to the output end of the air pump; Filtering scraping mechanism, the filtering scraping mechanism is connected to the other end of the covering telescopic mechanism, and the covering telescopic mechanism is used to drive the filtering scraping mechanism to move along the length direction of the measuring component. The filtering scraping mechanism includes a filtering component and an expandable scraping component connected to the filtering component. Both the filtering component and the expandable scraping component are sleeved outside the measuring component. The internal space of the expandable scraping component is communicated with the internal space of the covering telescopic mechanism. When the expandable scraping component is in the expanded state, the area between the outer surfaces of the mounting bracket, the covering telescopic mechanism, the filtering scraping mechanism and the measuring component is only communicated with the internal space of the pipeline to be measured through the filtering component.

[0006] As a further optimized solution of the present invention, a one-way air guiding mechanism is provided in the covering telescopic mechanism. The internal space of the covering telescopic mechanism is unidirectionally communicated with the internal space of the expandable scraping component through the one-way air guiding mechanism. The one-way air guiding mechanism is used to limit the gas in the covering telescopic mechanism to only flow into the expandable scraping component.

[0007] As a further optimized solution of the present invention, the covering telescopic mechanism includes a first telescopic bellows, a second telescopic bellows coaxially arranged with the first telescopic bellows, and an annular structural member. One ends of the first telescopic bellows and the second telescopic bellows are fixedly connected to the lower end surface of the mounting bracket, and the other ends of the first telescopic bellows and the second telescopic bellows are fixedly connected to the annular structural member. A sealed chamber is formed between the lower end surface of the mounting bracket, the first telescopic bellows, the second telescopic bellows and the annular structural member, and the sealed chamber is communicated with the output end of the air pump.

[0008] As a further optimized solution of the present invention, the filtering component includes an annular connecting plate and a plurality of air holes two provided on the annular connecting plate. One end of the annular connecting plate is fixedly connected to the annular structural member.

[0009] As a further optimized solution of the present invention, the expandable scraping component includes an annular scraping member, an annular expansion bladder connected to the inner circular surface of the annular scraping member, an air guide pipe connected to the annular scraping member, and an air venting cavity two provided inside the annular scraping member. The annular scraping member is fixedly connected to the other end of the air hole two. Both ends of the air venting cavity two are communicated with the annular expansion bladder and the air guide pipe respectively. The other end of the air guide pipe is communicated with the output end of the one-way air guiding mechanism.

[0010] As a further optimized solution of the present invention, the one-way air guiding mechanism includes a pipe fitting connected to the annular structural member, a partition fixedly connected to the inner circular surface of the pipe fitting, a plurality of first air guiding holes provided on the partition, a plastic sealing sheet connected to the lower end surface of the first air guiding holes, and a first air vent passage provided inside the annular structural member. The air guiding pipe is communicated with the inner space of the pipe fitting through the first air vent passage. Only one end of the plastic sealing sheet is fixedly connected to the partition, and the plastic sealing sheet covers the plurality of first air guiding holes.

[0011] As a further optimized solution of the present invention, the limiting mechanism includes a fixed base fixedly connected to the upper end surface of the mounting bracket, a first piston rod slidably connected inside the fixed base, an arc-shaped clamping member fixedly connected to the other end of the first piston rod, and a first spring connected between the fixed base and the arc-shaped clamping member. The arc-shaped clamping member is arranged in a matching manner with the measuring assembly.

[0012] As a further optimized solution of the present invention, it further includes a pneumatic reset mechanism. The pneumatic reset mechanism includes an elastic exhaust assembly connected to the annular scraping member and a reset pressing rod connected to the lower end surface of the mounting bracket. The elastic exhaust assembly is communicated with the inner space of the annular expansion bladder. When the elastic exhaust assembly contacts the reset pressing rod and generates a set acting force, the inner space of the annular expansion bladder is communicated with the inner space of the pipeline to be measured through the elastic exhaust assembly.

[0013] As a further optimized solution of the present invention, the elastic exhaust assembly includes a hollow stepped pipe and a fixed sleeve fixedly connected to the annular scraping member, a second piston rod slidably connected inside the fixed sleeve, an airtight member fixedly connected to one end of the second piston rod, a second spring connected between the airtight member and the fixed sleeve, and a third air vent passage provided inside the annular scraping member. The fixed sleeve is located inside the hollow stepped pipe. The inner space of the annular expansion bladder is communicated with the inner space of the hollow stepped pipe through the third air vent passage. When the second piston rod is in a compressed state, the inner space of the hollow stepped pipe is communicated with the inner space of the pipeline to be measured.

[0014] As a further optimized solution of the present invention, the measuring assembly includes a measuring pipe, a liquid level measuring module provided inside the measuring pipe, and a flow rate measuring module movably connected to the measuring pipe. Both the liquid level measuring module and the flow rate measuring module are electrically connected to the lead wire.

[0015] The beneficial effects of the present invention are as follows: The inserted electromagnetic flowmeter of the present invention can be directly installed at the detection port position of the pipeline, and the cost is much lower than that of the pipeline type non-full pipe electromagnetic flowmeter. During the use process, the outer surface of the measuring assembly part of the electromagnetic flowmeter can be automatically cleaned to prevent water impurities from adhering to its surface to form an adhesion layer, and during the cleaning process, the continuous operation of the measuring assembly and the data acquisition accuracy are not affected. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is of the present invention Figure 1 partial cross-sectional view; Figure 3 is of the present invention Figure 2 enlarged view at position A in; Figure 4 is of the present invention Figure 2 enlarged view at position B in; Figure 5 is a mating view of the plastic sealing sheet and the first air hole of the present invention; Figure 6 is of the present invention Figure 2 enlarged view at position C in; Figure 7 is of the present invention Figure 2 enlarged view at position D in; Figure 8 is of the present invention Figure 2 enlarged view at position E in.

[0017] In the figure: 1, mounting bracket; 2, limiting mechanism; 201, fixed base; 202, first piston rod; 203, arc-shaped clamping member; 204, first spring; 3, electromagnetic flow measurement mechanism; 31, measurement component; 32, lead wire; 4, covered telescopic mechanism; 401, first telescopic bellows; 402, second telescopic bellows; 403, annular structural member; 5, air pump; 6, one-way air guiding mechanism; 601, pipe fitting; 602, partition plate; 603, first air guiding hole; 604, plastic sealing sheet; 605, first air ventilation cavity; 7, filtering and scraping mechanism; 701, annular connecting plate; 702, second air hole; 703, annular scraping member; 704, air duct; 705, second air ventilation cavity; 706, annular expansion bladder; 8, air pressure reset mechanism; 801, hollow stepped pipe; 802, fixed sleeve; 803, second piston rod; 804, second spring; 805, airtight member; 806, third air ventilation cavity; 807, reset pressure rod. Detailed Embodiments

[0018] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Additionally, features described relative to some examples can be combined in other examples.

[0019] As Figures 1 to 8 shown, an insert type non-full pipe electromagnetic flowmeter includes: Installation bracket 1 is welded to the inner wall of the pipeline to be measured, and an installation hole is provided at the middle position of the installation bracket 1; Electromagnetic flow measurement mechanism 3, the electromagnetic flow measurement mechanism 3 includes a measurement component 31 and a lead wire 32 connected to the measurement component 31. The lead wire 32 passes through the pipeline to be measured and is connected to the control terminal. The measurement component 31 is arranged at the installation hole; A plurality of limiting mechanisms 2 are evenly distributed on the upper end surface of the installation bracket 1, and the plurality of limiting mechanisms 2 are all used for limiting and clamping the measurement component 31; Air pump 5 is connected to the upper end surface of the installation bracket 1, and the input end of the air pump 5 is communicated with the internal space of the pipeline to be measured; Coated telescopic mechanism 4 is connected to the lower end surface of the installation bracket 1, and the coated telescopic mechanism 4 is sleeved outside the measurement component 31. The internal space of the coated telescopic mechanism 4 is connected to the output end of the air pump 5; Filtering and scraping mechanism 7 is connected to the other end of the coated telescopic mechanism 4. The coated telescopic mechanism 4 is used to drive the filtering and scraping mechanism 7 to move along the length direction of the measurement component 31. The filtering and scraping mechanism 7 includes a filtering component and an expandable scraping component connected to the filtering component. Both the filtering component and the expandable scraping component are sleeved outside the measurement component 31. The internal space of the expandable scraping component is connected to the internal space of the coated telescopic mechanism 4. When the expandable scraping component is in the expanded state, the area between the outer surfaces of the installation bracket 1, the coated telescopic mechanism 4, the filtering and scraping mechanism 7 and the measurement component 31 is only communicated with the internal space of the pipeline to be measured through the filtering component.

[0020] It should be noted that during installation, the mounting bracket 1 matched with the electromagnetic flow measurement mechanism 3 is spot welded to the inner wall of the pipe to be measured, and a hole for the lead wire 32 and the wire to pass through is opened on the pipe to be measured, and then the lead wire 32 and the measuring component 31 are passed through the mounting holes on the mounting bracket 1 in turn, the lead wire 32 passes through the pipe to be measured and is electrically connected to the external core processor, and the measuring component 31 is located at the mounting hole and is stably clamped by a number of limit mechanisms 2. At this time, the position of the measuring component 31 is stable and unchanged, and the flow rate of the liquid in the pipe to be measured can be continuously and accurately measured. After long-term use, gas is pumped into the sheathed telescopic mechanism 4 through the air pump 5. As the gas is continuously pumped in, the expandable scraper component preferentially expands and contacts the outer surface of the measuring component 31 and applies the set Pressure, when the set pressure is reached, the enclosed telescopic mechanism 4 begins to extend along the length direction of the measuring component 31, and pushes the filtering component and the expanding scraping component to move in the same direction and distance, and during the movement, the impurity accumulation layer on the outer surface of the measuring component 31 is cleared, and when the filtering component and the expanding scraping component enter the water, the water enters the area between the mounting bracket 1, the enclosed telescopic mechanism 4, the filtering scraping mechanism 7 and the outer surface of the measuring component 31 after being filtered by the filtering component, so that the measuring component 31 can continuously measure the water flow rate in the pipeline, and the influencing error can be ignored, and at the same time, impurities in the water can be prevented from entering the cleaned area between the mounting bracket 1, the enclosed telescopic mechanism 4, the filtering scraping mechanism 7 and the outer surface of the measuring component 31, which can effectively improve the cleaning effect.

[0021] In an optional embodiment, if Figures 1 to 4 as well as Figure 6 As shown, the wrapped telescopic mechanism 4 includes a telescopic bellows 1 401, a telescopic bellows 2 402 coaxially arranged with the telescopic bellows 1 401, and an annular structure 403. One end of the telescopic bellows 1 401 and the telescopic bellows 2 402 are fixedly connected to the lower end surface of the mounting bracket 1, and the other ends of the telescopic bellows 1 401 and the telescopic bellows 2 402 are fixedly connected to the annular structure 403. A sealed chamber is formed between the lower end surface of the mounting bracket 1, the telescopic bellows 1 401, the telescopic bellows 2 402, and the annular structure 403, and the sealed chamber is connected to the output end of the air pump 5.

[0022] It should be noted that, as described above, with the operation of the air pump 5, the gas in the pipeline is pumped into the sealed chamber formed between the lower end surface of the mounting bracket 1, the first telescopic bellows 401, the second telescopic bellows 402, and the annular structure 403. Since the expansion type scraping assembly is communicated with the sealed chamber, as the amount of gas pumped by the air pump 5 gradually increases, the expansion type scraping assembly expands preferentially. When the expansion type scraping assembly contacts the surface of the measuring assembly 31 and generates a set pressure, the first telescopic bellows 401 and the second telescopic bellows 402 start to elongate under the action of air pressure, and the annular structure 403 starts to move stably along the length direction of the measuring assembly 31, and pushes the filtering assembly and the expansion type scraping assembly to move in the same direction and at the same distance.

[0023] In an alternative embodiment, as Figures 4 to 6 shown, a one-way air guiding mechanism 6 is provided inside the wrapped telescopic mechanism 4. The internal space of the wrapped telescopic mechanism 4 is in one-way communication with the internal space of the expansion type scraping assembly through the one-way air guiding mechanism 6. The one-way air guiding mechanism 6 is used to limit the gas in the wrapped telescopic mechanism 4 to only flow into the expansion type scraping assembly.

[0024] The one-way air guiding mechanism 6 includes a pipe fitting 601 connected to the annular structure 403, a partition plate 602 fixedly connected to the inner circular surface of the pipe fitting 601, a plurality of first air guiding holes 603 provided on the partition plate 602, a plastic sealing sheet 604 connected to the lower end surface of the first air guiding holes 603, and a first air vent passage 605 provided inside the annular structure 403. The air duct 704 is communicated with the internal space of the pipe fitting 601 through the first air vent passage 605. Only one end of the plastic sealing sheet 604 is fixedly connected to the partition plate 602, and the plastic sealing sheet 604 covers the plurality of first air guiding holes 603.

[0025] It should be noted that as described above, in order to prevent the expansion type scraping assembly from detaching from the outer surface of the measurement assembly 31 during the retraction process of the wrapped telescopic mechanism 4, which may cause water containing impurities to enter the area between the outer surfaces of the mounting bracket 1, the wrapped telescopic mechanism 4, the filter type scraping mechanism 7, and the measurement assembly 31, a one-way air guiding mechanism 6 is added. The one-way air guiding mechanism 6 can restrict the reverse flow of gas from the expansion type scraping assembly back into the wrapped telescopic mechanism 4. The working principle of the one-way air guiding mechanism 6 is as follows: when the gas flows from the sealed chamber towards the expansion type scraping assembly, the plastic sealing piece 604 is forced to bend towards the annular structural member 403 under the action of air pressure. At this time, the plastic sealing piece 604 no longer blocks a plurality of air guiding holes one 603, and the sealed chamber is communicated with the air venting channel one 605 through the plurality of air guiding holes one 603, so that the gas can flow towards the inside of the expansion type scraping assembly. When the wrapped telescopic mechanism 4 retracts, a negative pressure begins to be generated in the sealed chamber. At this time, the plastic sealing piece 604 will tightly adhere to the partition plate 602 and block a plurality of air guiding holes one 603 under the action of the negative pressure. At this time, the gas inside the expansion type scraping assembly cannot flow back to the sealed chamber under the action of the negative pressure, so that the expansion type scraping assembly can always maintain a stable expansion state during the retraction process of the wrapped telescopic mechanism 4, and thus effectively prevent water containing impurities from entering the area between the outer surfaces of the mounting bracket 1, the wrapped telescopic mechanism 4, the filter type scraping mechanism 7, and the measurement assembly 31.

[0026] In an alternative embodiment, as Figure 6 , Figure 7 shown, the filter assembly includes an annular connecting plate 701 and a plurality of air holes two 702 provided on the annular connecting plate 701. One end of the annular connecting plate 701 is fixedly connected to the annular structural member 403.

[0027] The expansion type scraping assembly includes an annular scraping member 703, an annular expansion bladder 706 connected to the inner circular surface of the annular scraping member 703, an air guiding pipe 704 connected to the annular scraping member 703, and an air venting channel two 705 provided inside the annular scraping member 703. The annular scraping member 703 is fixedly connected to the other end of the air hole two 702. The two ends of the air venting channel two 705 are respectively communicated with the annular expansion bladder 706 and the air guiding pipe 704. The other end of the air guiding pipe 704 is communicated with the output end of the one-way air guiding mechanism 6.

[0028] It should be noted that, as described above, as the air pump 5 pumps in gas, the gas flows through the sealed chamber, the first air guide hole 603, the pipe fitting 601, the first air passage 605, the air guide pipe 704 and the second air passage 705 in sequence and then enters the annular expansion bladder 706, so that the annular expansion bladder 706 begins to expand. When the annular expansion bladder 706 contacts the outer surface of the measurement assembly 31 and generates a set pressure value, the air pressure intensity in the sealed chamber can push the annular structural member 403 to start moving. After the second air hole 702 enters the water, the water flow in the pipeline can enter the area between the installation bracket 1, the wrapped telescopic mechanism 4, the filtering and scraping mechanism 7 and the outer surface of the measurement assembly 31 after being filtered by the second air hole 702, so that the measurement assembly 31 can always maintain a state of contact with the water flow, and the liquid level change error can be ignored, so that the measurement assembly 31 can be stably in the measurement state, and it is more suitable for equipment that needs to continuously monitor the water flow velocity.

[0029] In an alternative embodiment, as Figure 3 shown, the limiting mechanism 2 includes a fixed base 201 fixedly connected to the upper end surface of the installation bracket 1, a first piston rod 202 slidably connected inside the fixed base 201, an arc-shaped clamping member 203 fixedly connected to the other end of the first piston rod 202, and a first spring 204 connected between the fixed base 201 and the arc-shaped clamping member 203. The arc-shaped clamping member 203 is arranged to match the measurement assembly 31.

[0030] It should be noted that, as described above, the arc-shaped clamping member 203 contacts the outer surface of the measurement assembly 31, and the first spring 204 provides elastic force for the arc-shaped clamping member 203, so that the arc-shaped clamping member 203 can apply a set pressure value to the measurement assembly 31, so that the measurement assembly 31 can be stably clamped and limited.

[0031] In an alternative embodiment, as Figures 7 to 8 shown, it further includes a pneumatic reset mechanism 8. The pneumatic reset mechanism 8 includes an elastic exhaust assembly connected to the annular scraping member 703 and a reset pressure rod 807 connected to the lower end surface of the installation bracket 1. The elastic exhaust assembly is communicated with the internal space of the annular expansion bladder 706. When the elastic exhaust assembly contacts the reset pressure rod 807 and generates a set acting force, the internal space of the annular expansion bladder 706 is communicated with the internal space of the pipeline to be measured through the elastic exhaust assembly.

[0032] The elastic exhaust assembly includes a hollow stepped tube 801 fixedly connected to the annular scraping member 703, a fixed sleeve 802, a piston rod two 803 slidably connected inside the fixed sleeve 802, an airtight member 805 fixedly connected to one end of the piston rod two 803, a spring two 804 connected between the airtight member 805 and the fixed sleeve 802, and an air vent passage three 806 provided inside the annular scraping member 703. The fixed sleeve 802 is located inside the hollow stepped tube 801. The internal space of the annular expansion bladder 706 is connected to the internal space of the hollow stepped tube 801 through the air vent passage three 806. When the piston rod two 803 is in a compressed state, the internal space of the hollow stepped tube 801 is connected to the internal space of the pipeline to be measured.

[0033] It should be noted that as described above, with the retraction of the wrapped telescopic mechanism 4, there may be some water remaining in the area between the annular connecting plate 701, the annular scraping member 703 and the measuring assembly 31, and this part of the water may cause deviations and fluctuations in the measurement data of the measuring assembly 31. Therefore, as the annular scraping member 703 moves upward until the reset push rod 807 is inserted into the hollow stepped tube 801 and presses the airtight member 805, so that the airtight member 805 no longer contacts the inner wall of the hollow stepped tube 801. At this time, the internal space of the hollow stepped tube 801 is connected to the internal space of the pipeline to be measured, and the gas in the annular expansion bladder 706 can be exported, so that the annular expansion bladder 706 is reset, which can effectively make the remaining water in the area between the annular connecting plate 701, the annular scraping member 703 and the measuring assembly 31 flow away from the gap between the annular scraping member 703 and the measuring assembly 31, and can effectively improve the measurement accuracy of the measuring assembly 31.

[0034] In an alternative embodiment, as shown in the figure, the measuring assembly 31 includes a measuring tube, a liquid level measuring module provided inside the measuring tube, and a flow rate measuring module movably connected to the measuring tube. Both the liquid level measuring module and the flow rate measuring module are electrically connected to the lead wire 32.

[0035] It should be noted that the liquid level measuring module is a capacitive liquid level measuring system, which mainly measures the liquid level of the medium in the pipeline and calculates the cross-sectional area A(t) of the medium with a known pipeline inner diameter in the pipeline through the liquid level; The flow measurement module adopts the principle of Faraday electromagnetic induction and mainly includes an electromagnetic coil and a pair of measuring electrodes. The measuring electrodes measure the electric signal generated by the fluid cutting the magnetic force lines of the electromagnetic coil to calculate the flow velocity v(t) of the medium in the pipeline; The measuring module obtains the cross-sectional area and flow velocity signals of the medium in the pipeline and inputs them into the core processor through the lead wire. The core processor calculates the flow rate Q(t) of the medium in the pipeline = v(t) * A(t); The measuring tube meets the waterproof requirements and is filled with potting compound inside.

[0036] The above has described the present embodiment, but the present embodiment is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of the present embodiment.

Claims

1. An insertion type non-full pipe electromagnetic flowmeter, characterized in that Comprising: An installation bracket (1), the installation bracket (1) is welded to the inner wall of the pipeline to be measured, and an installation hole is provided at the middle position of the installation bracket (1); An electromagnetic flow measurement mechanism (3), the electromagnetic flow measurement mechanism (3) includes a measurement component (31) and a lead wire (32) connected to the measurement component (31), the lead wire (32) passes through the pipeline to be measured and is connected to a control terminal, and the measurement component (31) is arranged at the installation hole; A plurality of limiting mechanisms (2), the plurality of limiting mechanisms (2) are evenly distributed on the upper end surface of the installation bracket (1), and the plurality of limiting mechanisms (2) are all used for limiting and clamping the measurement component (31); An air pump (5), the air pump (5) is connected to the upper end surface of the installation bracket (1), and the input end of the air pump (5) is communicated with the internal space of the pipeline to be measured; A covering type telescopic mechanism (4), the covering type telescopic mechanism (4) is connected to the lower end surface of the installation bracket (1), and the covering type telescopic mechanism (4) is sleeved outside the measurement component (31), and the internal space of the covering type telescopic mechanism (4) is connected to the output end of the air pump (5); A filtering and scraping mechanism (7), the filtering and scraping mechanism (7) is connected to the other end of the covering type telescopic mechanism (4), the covering type telescopic mechanism (4) is used to drive the filtering and scraping mechanism (7) to move along the length direction of the measurement component (31), the filtering and scraping mechanism (7) includes a filtering component and an expandable scraping component connected to the filtering component, both the filtering component and the expandable scraping component are sleeved outside the measurement component (31), and the internal space of the expandable scraping component is communicated with the internal space of the covering type telescopic mechanism (4). When the expandable scraping component is in an expanded state, the area between the outer surfaces of the installation bracket (1), the covering type telescopic mechanism (4), the filtering and scraping mechanism (7) and the measurement component (31) is only communicated with the internal space of the pipeline to be measured through the filtering component.

2. The insertion type non-full pipe electromagnetic flowmeter according to claim 1, characterized in that A one-way air guiding mechanism (6) is arranged in the covering type telescopic mechanism (4), and the internal space of the covering type telescopic mechanism (4) is unidirectionally conducted with the internal space of the expandable scraping component through the one-way air guiding mechanism (6), and the one-way air guiding mechanism (6) is used to limit the gas in the covering type telescopic mechanism (4) to only flow into the expandable scraping component.

3. The insertion type non-full pipe electromagnetic flowmeter according to claim 2, characterized in that, The covering type telescopic mechanism (4) includes a telescopic bellows one (401), a telescopic bellows two (402) coaxially arranged with the telescopic bellows one (401) and an annular structural member (403). One ends of the telescopic bellows one (401) and the telescopic bellows two (402) are both fixedly connected to the lower end surface of the installation bracket (1), and the other ends of the telescopic bellows one (401) and the telescopic bellows two (402) are both fixedly connected to the annular structural member (403). A sealed chamber is formed between the lower end surface of the installation bracket (1), the telescopic bellows one (401), the telescopic bellows two (402) and the annular structural member (403), and the sealed chamber is communicated with the output end of the air pump (5).

4. The insertion type non-full pipe electromagnetic flowmeter according to claim 3, characterized in that, The filtering component includes an annular connecting plate (701) and a plurality of second air holes (702) provided on the annular connecting plate (701), and one end of the annular connecting plate (701) is fixedly connected to the annular structural member (403).

5. An insertion type non-full pipe electromagnetic flowmeter according to claim 4, characterized in that The expandable scraping component includes an annular scraping member (703), an annular expansion bladder (706) connected to the inner circular surface of the annular scraping member (703), an air guide pipe (704) connected to the annular scraping member (703), and a second air passage (705) provided inside the annular scraping member (703). The annular scraping member (703) is fixedly connected to the other end of the second air hole (702). Both ends of the second air passage (705) are communicated with the annular expansion bladder (706) and the air guide pipe (704) respectively, and the other end of the air guide pipe (704) is communicated with the output end of the one-way air guiding mechanism (6).

6. An insertion type non-full pipe electromagnetic flowmeter according to claim 5, characterized in that, The one-way air guiding mechanism (6) includes a pipe fitting (601) connected to the annular structural member (403), a partition plate (602) fixedly connected to the inner circular surface of the pipe fitting (601), a plurality of first air guide holes (603) provided on the partition plate (602), a plastic sealing sheet (604) connected to the lower end surface of the first air guide hole (603), and a first air passage (605) provided inside the annular structural member (403). The air guide pipe (704) is communicated with the internal space of the pipe fitting (601) through the first air passage (605). Only one end of the plastic sealing sheet (604) is fixedly connected to the partition plate (602), and the plastic sealing sheet (604) covers a plurality of first air guide holes (603).

7. An insertion type non-full pipe electromagnetic flowmeter according to claim 6, characterized in that, The limiting mechanism (2) includes a fixed base (201) fixedly connected to the upper end surface of the mounting bracket (1), a first piston rod (202) slidably connected inside the fixed base (201), an arc-shaped clamping member (203) fixedly connected to the other end of the first piston rod (202), and a first spring (204) connected between the fixed base (201) and the arc-shaped clamping member (203). The arc-shaped clamping member (203) is arranged in a matching manner with the measuring component (31).

8. An insertion type non-full pipe electromagnetic flowmeter according to claim 7, characterized in that, It further includes a pneumatic reset mechanism (8). The pneumatic reset mechanism (8) includes an elastic exhaust component connected to the annular scraping member (703) and a reset pressure rod (807) connected to the lower end surface of the mounting bracket (1). The elastic exhaust component is communicated with the internal space of the annular expansion bladder (706). When the elastic exhaust component contacts the reset pressure rod (807) and generates a set acting force, the internal space of the annular expansion bladder (706) is communicated with the internal space of the pipeline to be measured through the elastic exhaust component.

9. An insertion type non-full pipe electromagnetic flowmeter according to claim 8, characterized in that, The elastic exhaust assembly includes a hollow stepped tube (801) and a fixed sleeve (802) fixedly connected to the annular scraping member (703), a piston rod two (803) slidably connected inside the fixed sleeve (802), an airtight member (805) fixedly connected to one end of the piston rod two (803), a second spring (804) connected between the airtight member (805) and the fixed sleeve (802), and a third ventilation cavity (806) provided inside the annular scraping member (703). The fixed sleeve (802) is located inside the hollow stepped tube (801). The internal space of the annular expansion bladder (706) is connected to the internal space of the hollow stepped tube (801) through the third ventilation cavity (806). When the piston rod two (803) is in a compressed state, the internal space of the hollow stepped tube (801) is connected to the internal space of the pipeline to be measured.

10. An insertion type non-full pipe electromagnetic flowmeter according to claim 9, characterized in that, The measurement assembly (31) includes a measurement tube, a liquid level measurement module provided inside the measurement tube, and a flow velocity measurement module movably connected to the measurement tube. Both the liquid level measurement module and the flow velocity measurement module are electrically connected to the lead wire (32).

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