Permanent magnet liquid metal flowmeter

Abstract

Embodiments of the present application provide a permanent magnet liquid metal flowmeter, comprising: a magnetic yoke comprising opposite first and second sides; first and second pole plates disposed between the first and second sides, the second pole plate adapted for placement of a tube under test between the first and second pole plates, the tube under test adapted for conveying a fluid comprising liquid metal; two arrays of permanent magnets connected between the first pole plate and the first side and between the second pole plate and the second side, such that the second pole plate and the first pole plate are configured to be magnetically coupled with the two arrays of permanent magnets to form a uniform magnetic field between the second pole plate and the first pole plate; and an electrode extending between the second pole plate and the first pole plate, the electrode extending in a direction that is perpendicular to both an axis of the tube under test and a direction of the uniform magnetic field, such that the electrode generates a measurement signal for characterizing a flow rate of the liquid metal in response to the liquid metal flowing through the uniform magnetic field in the tube under test.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a permanent magnet liquid metal flowmeter, in particular to a permanent magnet liquid metal flowmeter with uniform and controllable magnetic field strength and facilitating simulation test. BACKGROUND

[0002] There are a large number of liquid metal pipeline flow measurement requirements in the fields of chemical industry and nuclear industry. Because the liquid metal is high in temperature and the measurement environment is high in radiation dose, conventional flowmeters cannot meet the measurement requirements. The permanent magnet liquid metal pipeline flowmeter has good radiation resistance and can realize high-temperature liquid metal flow measurement. At the same time, the permanent magnet liquid metal pipeline flowmeter has good linearity, high-temperature resistance, radiation resistance and other advantages, and is widely used for pipeline flow measurement of liquid metal medium at home and abroad.

[0003] The liquid metal pipeline flowmeter adopts different structural forms to meet the measurement requirements according to the size of the pipe diameter. At present, the small-diameter pipeline flowmeter often adopts a special-shaped permanent magnet magnetic steel structure (such as a horn type) to obtain a larger magnetic field. However, this magnetic steel structure flowmeter is heavy, not easy to magnetize, and has poor long-term stability of the magnetic field. At the same time, the internal magnetic circuit of the special-shaped magnetic steel assembly permanent magnet is complex, and it is difficult to simulate the internal magnetic circuit distribution of the magnetic steel using simulation software, and the magnetic field strength cannot be accurately estimated. For large-diameter pipeline flowmeters, a single-row permanent magnet magnetic steel structure is often used to obtain a magnetic field. However, the size and weight of the single permanent magnet in this structure are large, and it is not easy to magnetize and assemble. At the same time, when the simulation software is used for design, the uniformity of the magnetic field distribution is not easy to adjust.

[0004] In addition, the traditional liquid metal pipeline flowmeter uses the position between the magnetic pole surface and the pipeline as the online calibration and magnetic measurement position. This position has a large magnetic field change rate and high temperature, and has high requirements for the positioning of the magnetic field device probe and high-temperature resistance, and is not easy to measure. SUMMARY

[0005] In order to solve at least one of the above or other technical problems, the embodiments of the present disclosure provide a permanent magnet liquid metal flowmeter. A parallelly arranged permanent magnet array cooperates with a magnetic pole plate to form a uniform and controllable magnetic field, facilitating simulation, and being suitable for the design of permanent magnet liquid metal flowmeters of various specifications. At the same time, the volume of each permanent magnet in the permanent magnet array is small, and the magnetization and assembly are difficult. The permanent magnet liquid metal flowmeter comprises:

[0006] A magnetic yoke comprising opposite first and second side faces; first and second pole plates disposed between the first and second side faces, the second pole plate adapted to receive a test tube therebetween, the test tube adapted to transport a fluid comprising liquid metal; two arrays of permanent magnets connected between the first pole plate and the first side face and between the second pole plate and the second side face, such that the second pole plate and the first pole plate are configured to be magnetically coupled by the two arrays of permanent magnets to form a uniform magnetic field between the second pole plate and the first pole plate; and an electrode disposed above the test tube, the electrode extending between the second pole plate and the first pole plate, the electrode extending in a direction perpendicular to both an axis of the test tube and a direction of the uniform magnetic field, such that the electrode generates a measurement signal for characterizing a flow rate of the liquid metal in response to the liquid metal flowing through the uniform magnetic field.

[0007] The permanent magnet liquid metal flowmeter according to the embodiments of the present disclosure forms a closed magnetic circuit by arranging two arrays of permanent magnets and two pole plates between the two side faces of the magnetic yoke, adjusts the size of the magnetic field by adjusting the number and distribution of the arrays of permanent magnets, and adjusts the magnetic field in combination with the two pole plates, thereby forming a uniform and controllable magnetic field to facilitate simulation tests, and the magnetization and installation of the arrays of permanent magnets are both very low in difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a perspective view of a permanent magnet liquid metal flowmeter according to an exemplary embodiment of the present disclosure;

[0009] Figure 2 is a front view of the permanent magnet liquid metal flowmeter shown in Figure 1 ;

[0010] Figure 3 is a schematic diagram of the working principle of the permanent magnet liquid metal flowmeter shown in Figure 1 ;

[0011] Figure 4 schematically shows a partial structure of a pipe clamp sliding connection of the permanent magnet liquid metal flowmeter according to the embodiments of the present disclosure; and

[0012] Figure 5 is an enlarged schematic diagram of a partial structure of the permanent magnet liquid metal flowmeter according to an exemplary embodiment of the present disclosure.

[0013] In the above drawings, the meanings of the reference signs are as follows:

[0014] 1 - magnetic yoke;

[0015] 101 - first side plate;

[0016] 102 - second side plate;

[0017] 103 - base plate;

[0018] 2 - first permanent magnet array;

[0019] 3 - first magnetic pole plate;

[0020] 4 - second permanent magnet array;

[0021] 5 - first magnetic pole plate;

[0022] 6 - electrode;

[0023] 7 - pipe to be measured;

[0024] 8 - pipe clamp;

[0025] 9 - magnetic measurement plate;

[0026] 10 - terminal board;

[0027] 11 - thermocouple;

[0028] 12 - countersunk bolt;

[0029] 13 - sliding assembly;

[0030] 1301 - sliding shaft;

[0031] 1302 - sliding sleeve;

[0032] 14 - protective cover; and

[0033] 15 - reinforcement. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments and drawings.

[0035] However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments can be practiced without these specific details. In addition, in the following description, descriptions of well-known technology are omitted to avoid unnecessarily obscuring the concept of the present disclosure.

[0036] The terms used herein are merely used to describe specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the presence of a feature, step, operation, but does not exclude the presence or addition of one or more other features.

[0037] In the event that a statement similar to "at least one of A, B, and C, etc." is used, it is generally intended that the inclusion of A, B, or C in the present disclosure be understood as any one of A, B, or C individually, A combined with B, A combined with C, B combined with C, or A combined with B and C, etc. In the event that a statement similar to "at least one of A, B, or C, etc." is used, it is generally intended that the inclusion of A, B, or C in the present disclosure be understood as any one of A, B, or C individually, A combined with B, A combined with C, B combined with C, or A combined with B and C, etc.

[0038] All terms used herein, including technical and scientific terms, have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. It should be further noted that the use of terms such as first, second, etc. herein do not denote any essence, amount, or order, but rather are useful to number various elements and components. It will be further understood that the terms "comprises" and / or "comprising," or "includes" and / or "including" when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0039] Figure 1 is a perspective view of a permanent magnet liquid metal flowmeter according to an example embodiment of the present disclosure; Figure 2 is Figure 1 is a front view of the permanent magnet liquid metal flowmeter shown.

[0040] Embodiments of the present disclosure provide a permanent magnet liquid metal flowmeter, such as Figure 1 and Figure 2 as shown, including a magnetic yoke 1, a first pole plate 3, an array of permanent magnets 2(4), a second pole plate 5, and an electrode 6.

[0041] The magnetic yoke 1 includes opposing first and second sides.

[0042] The first and second pole plates 3, 5 are disposed between the first and second sides, with the first pole plate 3 adapted for placement of a tube under test 7 between the first pole plate 3 and the second pole plate 5, the tube under test 7 adapted for transmission of a fluid including liquid metal.

[0043] Two arrays of permanent magnets are connected between the first pole plate 3 and the first side, and between the second pole plate 5 and the second side, respectively, such that the first and second pole plates 3, 5 are configured to magnetically couple with the two arrays of permanent magnets to form a uniform magnetic field between the first and second pole plates 3, 5.

[0044] Electrode 6 is positioned above tube 7 to be tested. Electrode 6 extends between the first magnetic pole plate 3 and the second magnetic pole plate 5. The extension direction of electrode 6, the axis of tube 7 to be tested, and the direction of the uniform magnetic field are perpendicular to each other, so that electrode 6 generates a measurement signal to characterize the flow rate of liquid metal in response to the flow of liquid metal in tube 7 through the uniform magnetic field.

[0045] In this embodiment, a closed magnetic circuit is formed by setting two sets of permanent magnet arrays and two sets of magnetic pole plates between the two sides of the magnetic yoke 1. The magnitude of the magnetic field is adjusted by adjusting the number and distribution of the permanent magnet arrays, and the magnetic field is adjusted in conjunction with the two magnetic pole plates, thereby forming a uniform and controllable magnetic field, which is convenient for simulation experiments. At the same time, the magnetization and installation of the permanent magnet arrays are relatively easy.

[0046] Figure 3 yes Figure 1 The diagram shown illustrates the working principle of a permanent magnet liquid metal flow meter.

[0047] In this embodiment, when the liquid metal flows in the pipe, it cuts the magnetic field lines, generating an induced electromotive force in the direction perpendicular to the pipe direction and the magnetic field direction.

[0048] The magnitude of the induced electromotive force is:

[0049]

[0050] in:

[0051] E: Induced electromotive force (V);

[0052] B: Magnetic flux density (T);

[0053] d: Pipe inner diameter (m);

[0054] Flow velocity (m / s).

[0055] Liquid metal volumetric flow rate Q in the pipeline:

[0056]

[0057] In the formula: This represents the flow rate corresponding to each millivolt output signal, i.e., the meter coefficient.

[0058] When the flow meter's structural dimensions are fixed, the instrument coefficient K is related to the liquid metal temperature T. f related.

[0059] K and liquid metal temperature T f The relationship can be represented as:

[0060] K = f(T) f (3)

[0061] The flow rate Q can be finally determined as:

[0062] Q = KE = f(T f )E (4)

[0063] According to some embodiments of the present disclosure, the two permanent magnet arrays include a first permanent magnet array 2 arranged between the magnetic yoke 1 and the first magnetic pole plate 3, and a second permanent magnet array 4 arranged between the magnetic yoke 1 and the second magnetic pole plate 5. Each of the permanent magnet arrays includes a plurality of cylindrical magnetic steels connected in parallel between the first magnetic pole plate 3 and the first side surface, or between the second magnetic pole plate 5 and the second side surface.

[0064] In the present embodiment, the cylindrical magnetic steels in the permanent magnet array have the characteristics of small volume, simple internal magnetic circuit, easy magnetization, and good long-term stability of the magnetic field. In the actual test process, the required magnetic field strength can be designed according to the diameter of the pipe 7 to be measured and theoretical calculation, the number of cylindrical permanent magnets and their distribution and arrangement position in the magnetic pole surface are adjusted to obtain the desired uniform magnetic field strength. The simulation software can simulate the magnetic circuit of the magnetic steel to accurately estimate the size of the magnetic field of the flowmeter.

[0065] According to some embodiments of the present disclosure, the diameter of each cylindrical magnetic steel ranges from 30 to 40 mm. Both the requirements of simple magnetization and simple assembly can be met.

[0066] Figure 4 The partial structure schematic diagram of the pipe clamp sliding connection of the permanent magnet type liquid metal flowmeter is schematically shown.

[0067] According to some embodiments of the present disclosure, as shown in Figure 1 and Figure 4 The permanent magnet type liquid metal flowmeter further includes at least one pipe clamp 8, each pipe clamp 8 includes two matched halves, each half includes an arc segment and a fixed end. The arc segment is sleeved on one side of the pipe 7 to be measured. The fixed end extends radially outward from both ends of the arc segment. The two fixed ends of one half are connected with the first side surface and the second side surface respectively, and are detachably connected with the fixed end of the other half.

[0068] In the present embodiment, the permanent magnet type liquid metal flowmeter is fixed at the measurement region of the pipe 7 to be measured by the pipe clamp 8. Optionally, the two halves are detachably connected by bolts.

[0069] According to some embodiments of the present disclosure, the number of pipe clamps 8 is two, and the two pipe clamps 8 are arranged at both ends of the magnetic yoke 1 along the axis direction of the pipe 7 to be measured, wherein one pipe clamp 8 is fixedly connected with the magnetic yoke 1, and the other pipe clamp 8 is slidingly connected with the magnetic yoke.

[0070] In the embodiment, the same side of the first side plate 101 and the second side plate 102 of the magnetic yoke 1 is symmetrically provided with a sliding shaft 1301 along the axial direction of the pipe 7 to be measured, and the fixed end of the pipe clamp 8 is provided with a sliding sleeve 1302 which is in sliding connection with the sliding shaft 1301. When the temperature changes, the spacing between the two pipe clamps 8 changes slightly with the sliding of the sliding sleeve 1302, so as to overcome the influence of the internal temperature stress of the structure caused by the temperature change on the overall structure, prevent deformation and further affect the accuracy of the measurement.

[0071] According to some embodiments of the present disclosure, the magnetic yoke 1 comprises a first side plate 101, a second side plate 102 and a bottom plate 103.

[0072] According to some embodiments of the present disclosure, the first side plate 101 extends perpendicularly from a first side edge of the bottom plate 103, and the second side plate 102 extends perpendicularly from a second side edge of the bottom plate 103 opposite to the first side edge. The bottom plate 103, the first side plate 101 and the second side plate 102 form a U-shaped groove structure.

[0073] According to some embodiments of the present disclosure, the permanent magnet type liquid metal flowmeter further comprises a magnetic measurement plate 9 and a magnetic field strength sensor. The two ends of the magnetic measurement plate 9 are respectively connected to the top of the first side plate 101 and the second side plate 102, and the magnetic field strength sensor is arranged on the magnetic measurement plate 9. The magnetic field strength sensor is used to measure the magnetic field strength between the first magnetic pole plate 3 and the second magnetic pole plate 5, so as to adjust the number of two permanent magnet arrays.

[0074] According to some embodiments of the present disclosure, a magnetic measurement hole is formed in the magnetic measurement plate 9, and the magnetic field strength sensor comprises a Tesla meter probe arranged in the magnetic measurement hole to measure the magnetic field strength between the first magnetic pole plate 3 and the second magnetic pole plate 5.

[0075] In the embodiment, the position directly above the pipeline is used as the online calibration magnetic field measurement position, which effectively avoids the shortcomings of large magnetic field change rate and poor repeatability of probe measurement results caused by high temperature, and improves the online calibration flow measurement accuracy.

[0076] According to some embodiments of the present disclosure, the permanent magnet type liquid metal flowmeter further comprises a wiring board 10 and an electrical connector. The wiring board 10 is arranged above the pipe 7 to be measured, and the two ends of the wiring board 10 are respectively connected to the outer side wall of the pipe 7 to be measured. The electrical connector is arranged on the wiring board 10, and the terminal of the electrical connector is connected with the electrode 6 to output the measurement signal.

[0077] According to some embodiments of the present disclosure, the permanent magnet type liquid metal flowmeter further comprises a thermocouple 11 mounted on the pipe to be measured. The thermocouple 11 is used to measure the temperature of the liquid metal, and the temperature of the liquid metal is suitable for compensating for the change of the permanent magnet type liquid metal flowmeter graduation characteristic caused by the change of the medium temperature.

[0078] According to some optional embodiments of the present disclosure, the thermocouple 11 is an armored thermocouple.

[0079] In the present embodiment, in view of the high and wide range of operating temperature of liquid metal, an armored thermocouple is installed on the flowmeter measuring tube to compensate in real time and on line for the change of flowmeter graduation characteristics caused by the change of medium temperature, thereby ensuring the measurement accuracy of liquid metal in the whole operating temperature range. The specific influence of temperature change on the change of flowmeter graduation characteristics can be obtained through test or simulation test, which will not be described in detail here.

[0080] According to some embodiments of the present disclosure, when the diameter of the pipe to be measured is less than 100 mm, the electrode 6 is arranged above the pipe to be measured 7, and the electrode 6 is located at the middle position of the pipe to be measured 7 passing through the magnetic field section; when the diameter of the pipe to be measured 7 is greater than or equal to 100 mm, the electrode 6 is arranged above the pipe to be measured 7, and the electrode 6 is located at the downstream region of the pipe to be measured 7 passing through the magnetic field section.

[0081] Figure 5 is a partial structure enlarged schematic view of a permanent magnet type liquid metal flowmeter according to an exemplary embodiment of the present disclosure.

[0082] According to some embodiments of the present disclosure, as shown in Figure 1 and Figure 5 , a plurality of blind holes are arranged in alignment on the two surfaces of the first magnetic pole plate 3 opposite to the first side surface, and on the two surfaces of the second magnetic pole plate 5 opposite to the second side surface, respectively, for accommodating and fixing the end of the cylindrical magnetic steel, respectively.

[0083] According to some embodiments of the present disclosure, a plurality of countersunk holes are arranged on the two surfaces of the first magnetic pole plate 3 and the second magnetic pole plate 5 opposite to each other, respectively, and the first side surface and the second side surface are respectively provided with through holes corresponding to the countersunk holes, and the permanent magnet type liquid metal flowmeter further comprises countersunk bolts 12 configured to cooperate with the countersunk holes and the through holes so that the magnetic yoke 1, the first magnetic pole plate 3 and the second magnetic pole plate 5 clamp the permanent magnet array.

[0084] According to some embodiments of the present disclosure, the spacing between the first magnetic pole plate 3 and the pipe to be measured 7 is 5-25 mm, and the spacing between the second magnetic pole plate 5 and the pipe to be measured 7 is 5-25 mm. For a general small-diameter pipe to be measured 7, the spacing is small, and as the diameter of the pipe to be measured 7 increases, the spacing between the second magnetic pole plate 5 and the pipe to be measured 7 also increases.

[0085] According to some embodiments of the present disclosure, the first magnetic pole plate 3 and the second magnetic pole plate 5 are arranged symmetrically with respect to the axis of the pipe to be measured 7.

[0086] According to some embodiments of the present disclosure, the permanent magnet type liquid metal flowmeter further comprises a protective cover 14, which covers the flowmeter entirely, for example, the protective cover 14 can prevent iron filings from entering the flowmeter to contact functional components such as permanent magnets.

[0087] According to some embodiments of the present disclosure, the permanent magnet type liquid metal flowmeter further comprises a reinforcing piece 15, which is arranged between the bottom plate 103 and the first side plate 101 and / or between the bottom plate 103 and the second side plate 102, to keep the bottom plate 103 perpendicular to the first side plate 101 and the second side plate 102, respectively.

[0088] According to some embodiments of the present disclosure, the first magnetic pole plate 3 and the second magnetic pole plate 5 are iron plates.

[0089] So far, the embodiments of the present disclosure have been described in detail in conjunction with the drawings. It should be noted that the implementation manners not shown or described in the drawings or the specification are known to those skilled in the art, and are not described in detail. In addition, the definition of each component described above is not limited to the various specific structures, shapes or manners mentioned in the embodiments, and can be simply changed or replaced by those skilled in the art.

[0090] It should also be noted that in the specific embodiments of the present disclosure, unless otherwise known as the opposite meaning, the numerical parameters in the specification and the appended claims are approximate values, which can be changed according to the required characteristics obtained by the content of the present disclosure. Specifically, all the numbers used in the specification and claims to express the size, range condition and the like of the composition should be understood as being modified by the term "about" in all cases. Generally, it means that it contains a change of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0091] Those skilled in the art can understand that the features described in various embodiments and / or claims of the present disclosure can be combined or / and combined, even if such combination or combination is not explicitly described in the present disclosure. In particular, the features described in various embodiments and / or claims of the present disclosure can be combined and / or combined without departing from the spirit and teachings of the present disclosure. All these combinations and / or combinations fall within the scope of the present disclosure.

[0092] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only for specific embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A permanent magnet liquid metal flowmeter characterized by, It comprises: a magnetic yoke comprising opposite first and second side surfaces; a first and a second magnetic pole plate arranged between the first and second side surfaces, the second magnetic pole plate being adapted for placing a tube under test between the first and second magnetic pole plate, the tube under test being adapted for transporting a fluid comprising liquid metal; two arrays of permanent magnets connected between the first magnetic pole plate and the first side surface and between the second magnetic pole plate and the second side surface, respectively, such that the second magnetic pole plate and the first magnetic pole plate are configured to be magnetically coupled with the two arrays of permanent magnets to form a homogeneous magnetic field between the second magnetic pole plate and the first magnetic pole plate; and an electrode arranged above the tube under test, the electrode extending between the second magnetic pole plate and the first magnetic pole plate, the electrode extending in a direction perpendicular to both an axis of the tube under test and a direction of the homogeneous magnetic field, such that the electrode generates a measurement signal for characterizing a flow rate of the liquid metal in response to the liquid metal flowing through the homogeneous magnetic field. two tube clamps, the two tube clamps being arranged at two ends of the magnetic yoke along the axis of the tube under test, wherein one of the tube clamps is fixedly connected with the magnetic yoke and the other tube clamp is slidably connected with the magnetic yoke; the magnetic yoke comprises a first side plate and a second side plate, the same side of the first side plate and the second side plate is symmetrically provided with a sliding shaft along the axis of the tube under test, and the fixed end of the tube clamp is provided with a sliding sleeve which is slidably connected with the sliding shaft, and when the temperature changes, the spacing between the tube clamps changes slightly with the sliding of the sliding sleeve. Each array of permanent magnets comprises a plurality of cylindrical magnetic steels connected in parallel between the first magnetic pole plate and the first side surface or between the second magnetic pole plate and the second side surface.

2. The permanent magnet liquid metal flowmeter of claim 1 wherein, Each tube clamp comprises two matched halves, each half comprising:

3. The permanent magnet liquid metal flowmeter of claim 2 wherein, an arc segment sleeved on one side of the tube under test; and a fixed end extending radially outward from each end of the arc segment; wherein the two fixed ends of one half are connected with the first side surface and the second side surface, respectively, and are detachably connected with the fixed end of the other half. The magnetic yoke comprises:

4. The permanent magnet liquid metal flowmeter of claim 1 wherein, a bottom plate; the first side plate extends perpendicularly from a first side edge of the bottom plate; and the second side plate extends perpendicularly from a second side edge of the bottom plate opposite to the first side edge; wherein the bottom plate, the first side plate and the second side plate form a U-shaped groove structure. It further comprises:

5. The permanent magnet liquid metal flowmeter of claim 4 wherein, a magnetism measuring plate connected with the top of the first side plate and the second side plate at both ends; a magnetic field strength sensor arranged on the magnetism measuring plate, the magnetic field strength sensor being used to measure the magnetic field strength between the first magnetic pole plate and the second magnetic pole plate, so as to adjust the number of the two arrays of permanent magnets. The magnetism measuring plate is provided with a magnetism measuring hole, and the magnetic field strength sensor comprises a Tesla meter probe arranged in the magnetism measuring hole to measure the magnetic field strength between the first magnetic pole plate and the second magnetic pole plate.

6. The permanent magnet liquid metal flowmeter of claim 5 wherein, It further comprises:

7. The permanent magnet liquid metal flowmeter of claim 1 wherein, ​ A wiring board is arranged above the pipe to be measured, and two ends of the wiring board are connected with the outer wall of the pipe to be measured, respectively. And An electric connector is arranged on the wiring board, and the wiring terminal of the electric connector is connected with the electrode to output the measurement signal.

8. The permanent magnet liquid metal flowmeter of claim 7 wherein, Further comprising: A thermocouple is installed on the pipe to be measured to measure the temperature of the liquid metal, wherein the temperature of the liquid metal is suitable for compensating the change of the permanent magnetic liquid metal flowmeter's graduation characteristic caused by the change of medium temperature.

9. The permanent magnetic liquid metal flowmeter according to claim 2, wherein A plurality of blind holes are arranged in alignment on the two faces of the first magnetic pole plate opposite to the first side face, and on the two faces of the second magnetic pole plate opposite to the second side face, respectively, for accommodating and fixing the end of the cylindrical magnetic steel, respectively.

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