A mass flow sensor

Abstract

The application discloses a mass flow sensor and relates to the technical field of Coriolis mass flow meters, which comprises a main body, two measuring pipes, a coil support connected with the main body, a driving assembly, wherein two first magnet supports are symmetrically connected at the middle positions of the two measuring pipes, first magnets are inserted into the first magnet supports, a first double-slot framework is connected with the coil support, the first double-slot framework is sleeved on the two first magnets, a first coil and a second coil are symmetrically wound on the first double-slot framework, the first coil is connected with the second coil, the first coil and the second coil are both connected with a transmitter, and two groups of detection assemblies are symmetrically arranged on the two sides of the driving assembly and connected with the measuring pipes. The mass flow sensor ensures the symmetry and coaxiality of the first coil, the second coil and the two first magnets, improves the stability of the two measuring pipes during resonant motion, and ensures the accuracy of measurement results.

Description

Technical Field

[0001] This application relates to the field of Coriolis mass flow meter technology, and in particular to a mass flow sensor. Background Technology

[0002] When fluid flows through a vibrating pipe, it exerts a force on the pipe wall called the Coriolis force. A mass flow meter is a direct mass flow instrument that utilizes the Coriolis force principle. Currently, common mass flow meters on the market consist of a mass flow sensor and a transmitter. The mass flow sensor comprises a main body, two measuring tubes, a drive magnet, a drive coil, a detection magnet, and a detection coil. Two measuring tubes are mounted on the main body, with the drive coil and detection coil installed on one tube, and the drive magnet and detection magnet installed on the other. Before the fluid enters the two measuring tubes, the excitation voltage provided by the transmitter is delivered to the drive coil, causing the drive coil and drive magnet to generate attractive and repulsive forces, thus causing the two measuring tubes to resonate, i.e., vibrate. After the fluid enters the two measuring tubes, under the influence of the Coriolis force, the vibration of the two measuring tubes changes. The detection coil converts the vibration of the two measuring tubes into current feedback to the transmitter, thereby realizing the measurement of the fluid's mass flow rate.

[0003] To ensure the stability of the two measuring tubes during their resonant motion before the fluid enters and the accuracy of the mass flow meter's measurement results after the fluid enters the two measuring tubes, the driving magnet and driving coil are typically symmetrically positioned on the two measuring tubes. However, in existing technologies, it is extremely difficult to achieve perfect symmetry between the driving magnet and driving coil installed on the two measuring tubes. This easily affects the balance and stability of the resonant motion, thereby reducing the stability of the mass flow meter's operation and ultimately leading to a decrease in the accuracy of the measurement results. Utility Model Content

[0004] Therefore, the technical problem to be solved by this application is to improve the asymmetrical distribution of driving magnets and driving coils on the two measuring tubes in the prior art.

[0005] To address the aforementioned technical problems, this application provides a mass flow sensor, comprising:

[0006] main body;

[0007] Two measuring tubes, both ends of which are connected to the main body;

[0008] A coil support, which is connected to the main body;

[0009] The driving assembly includes two first magnet supports, two first magnets, a first double-slot frame, a first coil, and a second coil. The two first magnet supports are symmetrically connected at the middle position of the two measuring tubes. One end of the first magnet is inserted into the first magnet support. The first double-slot frame is connected to the coil support and is sleeved on the other end of the two symmetrically arranged first magnets. The first coil and the second coil are symmetrically wound on the first double-slot frame. One end of the first coil is connected to the transmitter, and the other end of the first coil is connected to one end of the second coil. The other end of the second coil is also connected to the transmitter.

[0010] Two sets of detection components are symmetrically arranged on both sides of the drive component. The detection components are connected to the measuring tube and are used to detect the vibration of the measuring tube.

[0011] Preferably, each detection assembly includes two second magnet supports, two second magnets, a second double-slot frame, a third coil, and a fourth coil. The two second magnet supports are symmetrically connected to the two measuring tubes. One end of the second magnet is inserted into the second magnet support. The second double-slot frame is connected to the coil support and is sleeved on the other end of the two symmetrically arranged second magnets. The third coil and the fourth coil are symmetrically wound on the second double-slot frame. One end of the third coil is connected to the transmitter, and the other end of the third coil is connected to one end of the fourth coil. The other end of the fourth coil is also connected to the transmitter.

[0012] Preferably, the first dual-slot frame includes:

[0013] The connecting part is connected to the coil support;

[0014] The cylindrical base portion is inserted through the connecting portion. Both ends of the cylindrical base portion are provided with baffles. The cylindrical base portion is also provided with a first through hole, and the other end of the first magnet is inserted into the first through hole.

[0015] The first coil and the second coil are both wound around the outside of the cylinder base, and the first coil and the second coil are respectively located between the connecting part and the two baffles.

[0016] Preferably, the driving component further includes:

[0017] The first copper needle, one end of the first coil is connected to the first copper needle, and the first copper needle is connected to the transmitter through a wire;

[0018] The second copper needle is connected to the other end of the first coil and one end of the second coil.

[0019] The third copper needle is connected to the other end of the second coil, and the third copper needle is connected to the transmitter via a wire;

[0020] The first copper needle, the second copper needle, and the third copper needle are all connected to the first double-groove skeleton.

[0021] Preferably, the first double-groove frame has three mounting holes, and the first copper needle, the second copper needle and the third copper needle are respectively inserted into the mounting holes.

[0022] Preferably, the first magnet holder includes:

[0023] A fixing component, one end of which is connected to the outside of the measuring tube;

[0024] The mounting ring is connected to the other end of the fixing member. The fixing member has a second through hole, and one end of the first magnet passes through the fixing member and is inserted into the mounting ring.

[0025] Preferably, one end of the fastener is configured as an arc-shaped structure.

[0026] Preferably, the coil support includes:

[0027] The first bracket is connected to the first double-slot frame;

[0028] The second bracket has one end connected to the first bracket and the other end connected to the main body.

[0029] Preferably, the first double-slot frame is bolted to the coil support, the coil support has a connecting slot, the first double-slot frame has a connecting hole, and the bolt passes through the connecting slot and the connecting hole.

[0030] Preferably, it also includes a stabilizing component, which includes two stabilizing plates, with the two ends of the measuring tube respectively passing through the two stabilizing plates.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] The mass flow sensor described in this application comprises two measuring tubes connected to a main body, two first magnet supports symmetrically connected at the midpoint between the two measuring tubes, and first magnets inserted into the two first magnet supports; a first double-slot frame is fitted onto the first magnets, and a first coil and a second coil are symmetrically wound around the first double-slot frame, both of which are connected to a transmitter; a coil support is connected to the main body, and the first double-slot frame is connected to the coil support by setting the coil support; before the fluid flows into the two measuring tubes, the first magnets are inserted into the first magnet supports by symmetrically connecting the two first magnet supports at the midpoint between the two measuring tubes, thus achieving... The symmetrical arrangement of the two first magnets; by fitting the first double-slot frame onto the first magnet, and symmetrically winding the first coil and the second coil around the first double-slot frame, and connecting the first double-slot frame to the coil support, the position of the first double-slot frame is fixed, thereby ensuring the fixed connection position of the first coil and the second coil on the two measuring tubes. This ensures the symmetry of the distribution of the first coil, the second coil, and the two first magnets, and achieves the coaxial distribution of the first coil, the second coil, and the two first magnets. This improves the balance and stability when the two measuring tubes resonate, improves the stability of the mass flow meter operation, and improves the accuracy of the measurement results. Attached Figure Description

[0033] To make the content of this application easier to understand, the following detailed description is provided based on specific embodiments and accompanying drawings, wherein:

[0034] Figure 1 This is a schematic diagram of a preferred embodiment of the present application;

[0035] Figure 2 This is a front view of a preferred embodiment of this application;

[0036] Figure 3 This is a cross-sectional view of the measuring tube, the first bracket, and the drive assembly in a preferred embodiment of this application.

[0037] Explanation of reference numerals in the accompanying drawings: 1. Main body; 2. Measuring tube; 3. Coil bracket; 31. First bracket; 311. Connecting groove; 32. Second bracket; 4. Drive assembly; 41. First magnet bracket; 411. Fixing member; 412. Second through hole; 413. Mounting ring; 42. First magnet; 43. First double-groove frame; 431. Connecting part; 432. Cylinder base part; 4321. First through hole; 433. Baffle; 44. First coil; 45. Second coil; 46. First copper needle; 47. Second copper needle; 48. Third copper needle; 49. Connecting hole; 5. Detection assembly; 51. Second magnet bracket; 52. Second magnet; 53. Second double-groove frame; 6. Stabilizer; 61. Stabilizing plate. Detailed Implementation

[0038] The present application will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present application, but the embodiments are not intended to limit the present application.

[0039] Reference Figures 1 to 3 As shown, this application discloses a mass flow sensor, comprising:

[0040] Entity 1;

[0041] Two measuring tubes 2, both ends of which are connected to the main body 1;

[0042] Coil bracket 3 is connected to main body 1;

[0043] The drive assembly 4 includes two first magnet supports 41, two first magnets 42, a first double-slot frame 43, a first coil 44, and a second coil 45. The two first magnet supports 41 are symmetrically connected at the middle position of the two measuring tubes 2. One end of the first magnet 42 is inserted into the first magnet support 41. The first double-slot frame 43 is connected to the coil support 3 and is sleeved on the other end of the two symmetrically arranged first magnets 42. The first coil 44 and the second coil 45 are symmetrically wound on the first double-slot frame 43. One end of the first coil 44 is connected to the transmitter, and the other end of the first coil 44 is connected to one end of the second coil 45. The other end of the second coil 45 is also connected to the transmitter.

[0044] Two sets of detection components 5 are symmetrically arranged on both sides of the drive component 4. The detection components 5 are connected to the measuring tube 2 and are used to detect the vibration of the measuring tube 2.

[0045] Specifically, in this embodiment, the first coil 44 is the same as the second coil 45; in this embodiment, the first magnet bracket 41 is connected to the outside of the measuring tube 2 by welding; in this embodiment, the first magnet 42 is connected to the first magnet bracket 41 by adhesive bonding; in this embodiment, the first double-slot frame 43 is connected to the coil bracket 3 by bolt connection.

[0046] By symmetrically connecting two first magnet supports 41 at the midpoint of the two measuring tubes 2, and inserting the first magnet 42 into the first magnet supports 41, the symmetrical arrangement of the two first magnets 42 is achieved. By fitting the first double-groove frame 43 onto the first magnet 42, and symmetrically winding the first coil 44 and the second coil 45 around the first double-groove frame 43, and connecting the first double-groove frame 43 to the coil support 3, the position of the first double-groove frame 43 is fixed, thereby ensuring the fixed connection position of the first coil 44 and the second coil 45 on the two measuring tubes 2. This ensures the symmetry of the distribution of the first coil 44, the second coil 45, and the two first magnets 42, and achieves the coaxial distribution of the first coil 44, the second coil 45, and the two first magnets 42. This improves the balance and stability of the two measuring tubes 2 when they resonate before the fluid flows into them, improves the stability of the mass flow meter operation, and improves the accuracy of the measurement results.

[0047] In existing technologies, two measuring tubes 2 are driven to resonant motion by using large driving magnets and driving coils with a large number of turns. For small-diameter measuring tubes 2, if the mass of the driving magnets is large, the weight borne by the measuring tube 2 is heavy, and the winding process of the driving coils on the small-diameter measuring tube 2 is also difficult. When measuring the mass flow rate of fluid using small-diameter measuring tubes 2, the measurement results are prone to inaccuracy. In contrast, this application symmetrically arranges two first magnets 42 for driving on the two measuring tubes 2, and symmetrically arranges a first coil 44 and a second coil 45 on the first double-groove frame 43. The transmitter simultaneously drives the first coil 44 and the second coil 45. The two coils 45 provide voltage, enabling the simultaneous vibration of two measuring tubes 2 using two coils with fewer turns and two lighter magnets. The reduced mass of the first magnet 42 and the reduced number of turns of the first coil 44 and the second coil 45 lower the weight borne by the two measuring tubes 2, thereby reducing nonlinear input interference to the measurement results and improving the accuracy of the mass flow meter in measuring fluids within the small-diameter measuring tubes 2. Furthermore, when providing the same driving force to the two measuring tubes 2, the reduced number of turns of the first coil 44 and the second coil 45 results in a smaller input current to the transmitter, making it safe to use in explosion-proof environments.

[0048] In this embodiment, preferably, each detection assembly 5 includes two second magnet supports 51, two second magnets 52, a second double-groove frame 53, a third coil, and a fourth coil. The two second magnet supports 51 are symmetrically connected to the two measuring tubes 2. One end of the second magnet 52 is inserted into the second magnet support 51. The second double-groove frame 53 is connected to the coil support 3 and is sleeved on the other end of the two symmetrically arranged second magnets 52. The third coil and the fourth coil are symmetrically wound on the second double-groove frame 53. One end of the third coil is connected to the transmitter, and the other end of the third coil is connected to one end of the fourth coil. The other end of the fourth coil is also connected to the transmitter.

[0049] It should be noted that in this embodiment, the second magnet support 51 is the same as the first magnet support 41, the second magnet 52 is the same as the first magnet 42, the second double-slot frame 53 is the same as the first double-slot frame 43, and the third coil and the fourth coil are the same as the first coil 44.

[0050] In this embodiment, preferably, the first double-groove frame 43 includes:

[0051] Connecting part 431, the connecting part 431 is connected to the coil bracket 3;

[0052] The cylindrical base portion 432 is inserted through the connecting portion 431. Both ends of the cylindrical base portion 432 are provided with baffles 433. The cylindrical base portion 432 is also provided with a first through hole 4321. The other end of the first magnet 42 is inserted into the first through hole 4321.

[0053] The first coil 44 and the second coil 45 are both wound around the outside of the cylinder base portion 432, and the first coil 44 and the second coil 45 are respectively located between the connecting portion 431 and the two baffles 433.

[0054] Specifically, in this embodiment, the connecting part 431 is connected to the middle position of the cylinder base part 432.

[0055] This application provides baffles 433 at both ends of the base portion 432 by connecting portion 431 on the base portion 432, which facilitates the fixing of the first coil 44 and the second coil 45 on the first double-slot frame 43.

[0056] In this embodiment, preferably, the driving component 4 further includes:

[0057] The first copper needle 46 is connected to one end of the first coil 44, and the first copper needle 46 is connected to the transmitter through a wire.

[0058] The second copper needle 47, the other end of the first coil 44 and one end of the second coil 45 are both connected to the second copper needle 47;

[0059] The third copper needle 48 is connected to the other end of the second coil 45. The third copper needle 48 is connected to the transmitter through a wire.

[0060] The first copper needle 46, the second copper needle 47, and the third copper needle 48 are all connected to the first double-groove skeleton 43.

[0061] Specifically, in this embodiment, the first copper needle 46, the second copper needle 47, and the third copper needle 48 are all connected to the connecting part 431. The first copper needle 46 is located on one side of the connecting part 431, and the second copper needle 47 and the third copper needle 48 are located on the other side of the connecting part 431.

[0062] By setting the first copper needle 46, the second copper needle 47 and the third copper needle 48 on the first double-slot frame 43, it is easier to connect the wires between the first coil 44, the second coil 45 and the transmitter.

[0063] In this embodiment, preferably, the first double-groove frame 43 has three mounting holes, and the first copper needle 46, the second copper needle 47 and the third copper needle 48 are respectively inserted into the mounting holes.

[0064] Specifically, in this embodiment, the mounting holes are all formed on the connecting part 431.

[0065] By opening mounting holes in the first double-groove frame 43, it is easy to connect and fix the first copper needle 46, the second copper needle 47 and the third copper needle 48 to the first double-groove frame 43.

[0066] In this embodiment, preferably, the first magnet support 41 includes:

[0067] Fixture 411, one end of which is connected to the outside of measuring tube 2;

[0068] Mounting ring 413 is connected to the other end of fixing member 411. Fixing member 411 has a second through hole 412. One end of first magnet 42 passes through fixing member 411 and is inserted into mounting ring 413.

[0069] By providing an mounting ring 413 at the other end of the fastener 411, the connection area of ​​the first magnet 42 is increased, thereby improving the stability of the connection of the first magnet 42 on the first magnet bracket 41.

[0070] In this embodiment, preferably, one end of the fastener 411 is configured as an arc-shaped structure.

[0071] By setting one end of the fastener 411 into an arc-shaped structure, which fits against the outer side of the measuring tube 2, the connection area of ​​the fastener 411 on the measuring tube 2 is increased, thereby improving the stability of the connection of the fastener 411 on the measuring tube 2.

[0072] In this embodiment, preferably, the coil support 3 includes:

[0073] The first bracket 31 is connected to the first double-groove frame 43;

[0074] The second support 32 has one end connected to the first support 31 and the other end connected to the main body 1.

[0075] Specifically, in this application, the second double-groove frame 53 of the detection component 5 is connected to the first bracket 31.

[0076] By setting the first bracket 31 and the second bracket 32, it is convenient to process and install the coil bracket 3; the wires led out by the second copper needle 47 and the third copper needle 48 when connected to the transmitter can also be fixed on the second bracket 32, which is beneficial to the neatness of the wire arrangement.

[0077] In this embodiment, preferably, the first double-slot frame 43 is bolted to the coil support 3, the coil support 3 is provided with a connecting slot 311, the first double-slot frame 43 is provided with a connecting hole 49, and the bolt passes through the connecting slot 311 and the connecting hole 49.

[0078] Specifically, in this embodiment, a connecting groove 311 is provided on the first bracket 31, and a connecting hole 49 is provided on the connecting part 431.

[0079] After the second bracket 32 ​​is fixed to the main body 1, the first bracket 31 is connected to the second bracket 32. When connecting the first double-groove skeleton 43, in order to ensure the symmetrical arrangement of the two first magnets 42, the first coil 44 and the second coil 45, the position of the cylinder base part 432 needs to be adjusted between the two first magnets 42. Therefore, by setting the connecting groove 311, when the bolt passes through the connecting groove 311 and the connecting hole 49, the bolt can slide in the connecting groove 311, so that the cylinder base part 43 can still adjust the connection position, which is convenient for the symmetrical and coaxial arrangement of the two first magnets 42, the first coil 44 and the second coil 45. After the cylinder base part 432 is adjusted to the appropriate position, the bolt is tightened, thereby completing the connection between the connecting part 431 and the first bracket 31.

[0080] In this embodiment, preferably, it also includes a stabilizer 6, which includes two stabilizer plates 61, with the two ends of the measuring tube 2 respectively passing through the two stabilizer plates 61.

[0081] Specifically, in this embodiment, there are two sets of stabilizers 6, which are symmetrically and parallelly arranged on the two measuring tubes 2.

[0082] By setting stabilizing plates 61 at both ends of the two measuring tubes 2, not only can the distance between the two measuring tubes 2 be limited, but the two ends of the two measuring tubes 2 can also be fixed.

[0083] The implementation principle of this application embodiment is as follows: the two ends of the two measuring tubes 2 are connected to the main body 1, the second bracket 32 ​​is connected to the main body 1, and the first bracket 31 is connected to the second bracket 32; two fixing parts 411 in the drive assembly 4 are symmetrically connected at the middle position of the two measuring tubes 2, and one end of the two first magnets 42 passes through the fixing parts 411 and is inserted into the two mounting rings 413; the cylindrical seat part 432 in the first double groove skeleton 43 is sleeved on the other end of the two first magnets 42, the connecting part 431 is connected to the first bracket 31, and the first coil 44 and the second coil 45 are symmetrically wound on the cylindrical seat part 432 and located between the two baffles 433 and the connecting part 431; before the fluid enters the two measuring tubes 2, the transmitter energizes the first coil 44 and the second coil 45 in the drive assembly 4, and the first coil 44 and the second coil 45 generate attraction and repulsion forces with the two first magnets 42, so that the two measuring tubes 2 make stable resonant motion and generate a sine wave with zero phase difference;

[0084] Two sets of detection components 5 are symmetrically arranged on both sides of the drive component 4. The detection components 5 and the drive component 4 are connected in the same way on the two measuring tubes 2. When the fluid enters the two measuring tubes 2, due to the Coriolis force of the fluid, the two measuring tubes 2 undergo relative torsional vibration, generating a sine wave with a phase difference. The vibration of the inlet and outlet sides of the two measuring tubes 2 is detected by the third coil, the fourth coil and the two second magnets 52 in the two sets of detection components 5, respectively. The vibration of the two measuring tubes 2 is converted into current by the third coil and the fourth coil and fed back to the transmitter, thereby calculating the mass flow rate of the fluid.

[0085] In summary, this application achieves symmetrical arrangement of the two first magnets 42 by symmetrically arranging the first magnet support 41 and the two first magnets 42 on the two measuring tubes 2; by fitting the first double-slot frame 43 on the two first magnets 42, and connecting the first double-slot frame 43 to the coil support 3, and symmetrically winding the first coil 44 and the second coil 45 on the first double-slot frame 43, the symmetrical arrangement of the first coil 44 and the second coil 45 is achieved, thereby realizing the coaxial arrangement of the first coil 44, the second coil 45 and the two first magnets 42, which improves the stability of the two measuring tubes 2 in resonant motion and ensures the accuracy of the measurement results.

[0086] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A mass flow sensor, characterized in that, include: Main body (1); Two measuring tubes (2), both ends of which are connected to the main body (1); Coil support (3), the coil support (3) is connected to the main body (1); The drive assembly (4) includes two first magnet supports (41), two first magnets (42), a first double-groove frame (43), a first coil (44), and a second coil (45). The two first magnet supports (41) are symmetrically connected at the middle position of the two measuring tubes (2). One end of the first magnet (42) is inserted into the first magnet support (41). The first double-groove frame (43) is connected to the coil support (3). The first double-groove frame (43) is sleeved on the other end of the two symmetrically arranged first magnets (42). The first coil (44) and the second coil (45) are symmetrically wound on the first double-groove frame (43). One end of the first coil (44) is connected to the transmitter. The other end of the first coil (44) is connected to one end of the second coil (45). The other end of the second coil (45) is connected to the transmitter. Two sets of detection components (5) are symmetrically arranged on both sides of the drive component (4). The detection components (5) are connected to the measuring tube (2) and are used to detect the vibration of the measuring tube (2).

2. The mass flow sensor according to claim 1, characterized in that: Each detection assembly (5) includes two second magnet supports (51), two second magnets (52), a second double-groove frame (53), a third coil, and a fourth coil. The two second magnet supports (51) are symmetrically connected to the two measuring tubes (2). One end of the second magnet (52) is inserted into the second magnet support (51). The second double-groove frame (53) is connected to the coil support (3). The second double-groove frame (53) is sleeved on the other end of the two symmetrically arranged second magnets (52). The third coil and the fourth coil are symmetrically wound on the second double-groove frame (53). One end of the third coil is connected to the transmitter. The other end of the third coil is connected to one end of the fourth coil. The other end of the fourth coil is connected to the transmitter.

3. A mass flow sensor according to claim 1, characterized in that: The first double-groove frame (43) includes: Connecting part (431), the connecting part (431) is connected to the coil support (3); The cylindrical base (432) is inserted through the connecting part (431). Both ends of the cylindrical base (432) are provided with baffles (433). The cylindrical base (432) is also provided with a first through hole (4321). The other end of the first magnet (42) is inserted into the first through hole (4321). The first coil (44) and the second coil (45) are both wound around the outside of the cylinder base (432), and the first coil (44) and the second coil (45) are respectively located between the connecting part (431) and the two baffles (433).

4. A mass flow sensor according to claim 1, characterized in that: The driving component (4) also includes: The first copper needle (46) is connected to one end of the first coil (44), and the first copper needle (46) is connected to the transmitter through a wire; The second copper needle (47) is connected to the other end of the first coil (44) and one end of the second coil (45); The third copper needle (48) is connected to the third copper needle (48) at the other end of the second coil (45), and the third copper needle (48) is connected to the transmitter through a wire; The first copper needle (46), the second copper needle (47) and the third copper needle (48) are all connected to the first double-groove skeleton (43).

5. A mass flow sensor according to claim 4, characterized in that: The first double-groove frame (43) has three mounting holes, and the first copper needle (46), the second copper needle (47) and the third copper needle (48) are respectively inserted into the mounting holes.

6. A mass flow sensor according to claim 1, characterized in that: The first magnet holder (41) includes: A fixing member (411), one end of which is connected to the outside of the measuring tube (2); Mounting ring (413) is connected to the other end of the fixing member (411). The fixing member (411) has a second through hole (412). One end of the first magnet (42) passes through the fixing member (411) and is inserted into the mounting ring (413).

7. A mass flow sensor according to claim 6, characterized in that: One end of the fastener (411) is configured as an arc-shaped structure.

8. A mass flow sensor according to claim 1, characterized in that: The coil support (3) includes: The first bracket (31) is connected to the first double-groove frame (43); The second support (32) has one end connected to the first support (31) and the other end connected to the main body (1).

9. A mass flow sensor according to claim 1, characterized in that: The first double-groove frame (43) is bolted to the coil support (3). The coil support (3) has a connecting groove (311) and the first double-groove frame (43) has a connecting hole (49). The bolt passes through the connecting groove (311) and the connecting hole (49).

10. A mass flow sensor according to claim 1, characterized in that: It also includes a stabilizer (6), which includes two stabilizer plates (61), and the two ends of the measuring tube (2) are respectively inserted on the two stabilizer plates (61).

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