Mass flow meter

Abstract

The utility model provides a mass flow meter, and relates to the technical field of detection. The mass flow meter comprises a main body, a shell, a measuring tube, a vibration unit, a detection unit and a support assembly. The two ends of the measuring tube are connected to the body, the vibration unit and the detection unit are arranged on the measuring tube, the vibration unit is used for making the measuring tube vibrate and comprises an electromagnetic coil, and the detection unit is used for detecting the mass flow of the measuring tube; the support assembly comprises a first support, the first end of the first support is connected to the body, the second end of the first support extends to the induction coil, a first distance is formed between the second end of the first support and the induction coil, and the induction coil is connected to the second end of the first support. A first fly wire is formed on the portion, suspended between the induction coil and the second end of the first support, of the wire, and the length L of the first fly wire and the first interval S meet the following relation: 1.05 < L / S < 1.5. The utility model provides a mass flow meter which can improve measurement accuracy.

Description

Technical Field

[0001] The utility model relates to the field of detection technology, in particular to a mass flow meter. Background Art

[0002] A Coriolis mass flowmeter is an instrument that directly and precisely measures the mass flow of a fluid. A driving coil drives the measuring tube to vibrate, and a detection coil is used to detect the phase difference of the measuring tube. The setting of the coil flying wire plays an important role in the measurement accuracy and stability of the flowmeter.

[0003] At present, the internal coil wiring of the mass flowmeter is generally to stick the wires from the two ends of the coil to the wall of the measuring tube, so that the wires are connected to the main circuit along the tube wall.

[0004] However, the above wiring method will reduce the measurement accuracy of the mass flow meter. Utility Model Content

[0005] In order to solve at least one of the problems mentioned in the background technology, the present invention provides a mass flowmeter that can improve measurement accuracy.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] The utility model provides a mass flow meter, comprising a main body, a housing, a measuring tube, a vibration unit, a detection unit and a bracket assembly, wherein at least part of the measuring tube, the vibration unit, the detection unit and at least part of the bracket assembly are arranged in the housing;

[0008] Both ends of the measuring tube are connected to the main body, and a vibration unit and a detection unit are provided in the measuring tube. The vibration unit is used to vibrate the measuring tube and includes an electromagnetic coil. The detection unit is used to detect the vibration state of the measuring tube, thereby obtaining the mass flow rate flowing through the measuring tube according to the vibration state. The detection unit includes an induction coil.

[0009] The bracket assembly includes a first bracket, a first end of the first bracket is connected to the main body, a second end of the first bracket extends toward the induction coil, and a first distance is provided between the second end of the first bracket and the induction coil. The starting end wire and the end wire of the induction coil are both connected to the second end of the first bracket and extend along the first bracket to the main body. The wire portion suspended between the induction coil and the second end of the first bracket forms a first flying lead, and the length L of the first flying lead and the first distance S satisfy the following relationship: 1.05<L / S<1.5.

[0010] As an optional embodiment, the bracket assembly further includes a second bracket, wherein a first end of the second bracket is connected to the main body, a second end of the second bracket extends toward the electromagnetic coil, and a second distance is provided between the second end of the second bracket and the electromagnetic coil, and a starting end wire and an ending wire of the electromagnetic coil are both connected to the second end of the second bracket and extend along the second bracket to the main body;

[0011] The wire portion suspended between the electromagnetic coil and the second end of the second bracket forms a second flying lead, and the length L1 of the second flying lead and the second spacing S1 satisfy the following relationship: 1.05<L1 / S1<1.5.

[0012] As an optional embodiment, the first bracket and the second bracket both include a bracket body and a terminal block, the first end of the bracket body is connected to the main body, the terminal block is rotatably connected to the second end of the bracket body, and the electromagnetic coil and the induction coil are both connected to the corresponding terminal blocks to adjust the tightness of the first flying line and / or the second flying line by rotating the terminal block.

[0013] As an optional embodiment, the bracket assembly further includes a reinforcing bracket, the reinforcing bracket is connected to the main body, and the first bracket and the second bracket are both connected to the reinforcing bracket.

[0014] As an optional implementation, along the thickness direction of the shell, the first bracket and the second bracket are connected to one side of the reinforcing bracket.

[0015] As an optional implementation, there is a distance between the first bracket and the second bracket along the thickness direction of the shell.

[0016] As an optional embodiment, the reinforcing bracket is constructed as a section of plate material that is bent multiple times to form multiple folds on the surface of the reinforcing bracket, and the first bracket and the second bracket are both connected to the ends of the folds.

[0017] As an optional implementation, the extension direction of the fold is consistent with the thickness direction of the shell, and the extension direction of the fold and the length direction of the first bracket form an angle.

[0018] As an optional implementation, the distance L from the connection point of the reinforcing bracket on the second bracket to the second end of the second bracket and the length L0 of the second bracket satisfy the following relationship: 0.3<L / L0<0.7.

[0019] As an optional embodiment, the measuring tube includes a first measuring tube and a second measuring tube, both of which are U-shaped structures, and the first measuring tube and the second measuring tube are spaced apart from each other and arranged opposite to each other;

[0020] The vibration unit also includes a first magnet, which is arranged at a position corresponding to the electromagnetic coil on the second measuring tube along the thickness direction of the shell. The electromagnetic coil is configured to attract or repel the first magnet when energized, thereby causing the first measuring tube and the second measuring tube to vibrate.

[0021] As an optional embodiment, there are two induction coils, both of which are arranged in the first measuring tube, and the two induction coils are symmetrically distributed on both sides of the electromagnetic coil. The detection unit also includes two second magnets, and the second magnets are arranged in positions of the second measuring tube corresponding to the induction coils. The induction coil is configured to generate an induced current through the second magnets.

[0022] As an optional embodiment, the bracket assembly is made of stainless steel or aluminum alloy material with an elastic modulus greater than 10 GPa.

[0023] The mass flowmeter provided by the utility model includes a main body, a shell, a measuring tube, a vibration unit, a detection unit and a bracket assembly, at least part of the measuring tube, the vibration unit, the detection unit and at least part of the bracket assembly are arranged in the shell; both ends of the measuring tube are connected to the main body, the vibration unit and the detection unit are arranged in the measuring tube, the vibration unit is used to make the measuring tube vibrate, the vibration unit includes an electromagnetic coil, the detection unit is used to detect the vibration state of the measuring tube, and thus obtain the mass flow flowing through the measuring tube according to the vibration state, and the detection unit includes an induction coil; the bracket assembly includes a first bracket, the first end of the first bracket is connected to the main body, the second end of the first bracket extends toward the induction coil, and there is a first distance between the second end of the first bracket and the induction coil, the starting end wire and the end wire of the induction coil are both connected to the second end of the first bracket and extend along the first bracket to the main body, the wire portion suspended between the induction coil and the second end of the first bracket forms a first flying wire, and the length L of the first flying wire and the first distance S satisfy the following relationship: 1.05<L / S<1.5.

[0024] The mass flowmeter provided by the utility model can connect the wires at the starting and ending ends of the induction coil to the ends of the first bracket through the provided bracket assembly, and connect to the main body along the first bracket, thereby avoiding interference with the vibration state of the measuring tube when the induction coil is routed. In addition, by controlling the ratio of the length of the first flying wire to the first spacing between 1.05 and 1.5, the tightness of the first flying wire is controlled within an appropriate range, thereby avoiding affecting the detection result of the detection unit, and greatly improving the detection accuracy of the mass flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of the first overall structure of a mass flow meter provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a second overall structure of a mass flowmeter provided in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0030] Figure 5 for Figure 2 The main view;

[0031] Figure 6 A schematic structural diagram of a reinforcement bracket in a mass flow meter provided by an embodiment of the present invention;

[0032] Figure 7 for Figure 6 The main view;

[0033] Figure 8 for Figure 6 Top view of .

[0034] Description of reference numerals:

[0035] 100-mass flow meter;

[0036] 110-main body;

[0037] 120-housing;

[0038] 130- measuring tube;

[0039] 131-first measuring tube; 132-second measuring tube;

[0040] 140-vibration unit;

[0041] 141 - electromagnetic coil; 142 - first magnet; 143 - first flying lead;

[0042] 150-Detection unit;

[0043] 151 - induction coil; 152 - second magnet; 153 - second flying wire;

[0044] 160-bracket assembly;

[0045] 161-first bracket; 162-reinforcement bracket; 1621-notch; 1622-crease; 163-second bracket. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0048] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0049] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0050] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0051] Currently, there are several common methods for routing coils within mass flowmeters. For example, the wires leading from the coil ends can be glued to the wall of the measuring tube, and then connected to the main circuit along the wall. This routing method will add the weight of the wire and glue to the measuring tube, thereby affecting the measurement accuracy of the flowmeter. For another example, the wires leading from the coil ends can be glued to the inside of a protective shell and then routed along the inside of the protective shell to the main circuit. This routing method can easily cause the insulation layer outside the wire to melt due to heat when the protective shell is subsequently sealed and welded, thereby reducing product reliability.

[0052] In view of this, the present invention provides a mass flowmeter 100, which, through the support assembly 160, can connect the wires at the starting and ending ends of the induction coil 151 to the ends of the first support 161, and connect to the main body 110 along the first support 161, thereby avoiding interference with the vibration state of the measuring tube 130 when the induction coil 151 is routed. In addition, by controlling the ratio of the length of the first flying wire 143 to the first spacing between 1.05-1.5, the tightness of the first flying wire 143 is controlled within an appropriate range, thereby avoiding affecting the detection results of the detection unit 150, thereby greatly improving the detection accuracy and reliability of the mass flowmeter 100.

[0053] You can refer to Figures 1 to 8 The embodiment of the present invention provides a mass flow meter 100, including a main body 110, a housing 120, a measuring tube 130, a vibration unit 140, a detection unit 150 and a bracket assembly 160, at least part of the measuring tube 130, the vibration unit 140, the detection unit 150 and at least part of the bracket assembly 160 are arranged in the housing 120; both ends of the measuring tube 130 are connected to the main body 110, the vibration unit 140 and the detection unit 150 are arranged in the measuring tube 130, the vibration unit 140 is used to vibrate the measuring tube 130, the vibration unit 140 includes an electromagnetic coil 141, and the detection unit 150 is used to detect the vibration state of the measuring tube 130, so as to obtain the mass flow through the measuring tube 130 according to the vibration state. The mass flow detection unit 150 includes an induction coil 151; the bracket assembly 160 includes a first bracket 161, the first end of the first bracket 161 is connected to the main body 110, the second end of the first bracket 161 extends toward the induction coil 151, and there is a first distance between the second end of the first bracket 161 and the induction coil 151. The starting end wire and the end wire of the induction coil 151 are both connected to the second end of the first bracket 161 and extend along the first bracket 161 to the main body 110. The suspended wire portion between the induction coil 151 and the second end of the first bracket 161 forms a first flying wire 143, and the length L of the first flying wire 143 and the first distance S satisfy the following relationship: 1.05<L / S<1.5.

[0054] It can be understood that the main body 110 has a circuit structure, and the induction coil 151 can be electrically connected to the circuit structure of the main body 110 along the first bracket 161, thereby realizing functions such as powering the induction coil 151.

[0055] Detecting the vibration state of the measuring tube 130 may specifically include detecting a phase difference of vibration at different positions on the measuring tube 130 , thereby calculating the mass flow rate of the fluid flowing through the measuring tube 130 based on the phase difference.

[0056] The wires extending from both ends of the induction coil 151 can be fixed to the second end of the first bracket 161 by welding, and the wires can be fixed and extended along the first bracket 161 by welding or gluing, so that the wires are connected to the circuit structure of the main body 110.

[0057] The mass flowmeter 100 provided by the embodiment of the present invention can connect the wires at the starting and ending ends of the induction coil 151 to the ends of the first bracket 161 through the provided bracket assembly 160, and connect to the main body 110 along the first bracket 161, thereby avoiding interference with the vibration state of the measuring tube 130 when the induction coil 151 is routed. In addition, by controlling the ratio of the length of the first flying wire 143 and the first spacing between 1.05 and 1.5, the tightness of the first flying wire 143 is controlled within an appropriate range, thereby avoiding affecting the detection result of the detection unit 150, and greatly improving the detection accuracy of the mass flowmeter 100.

[0058] In the above embodiment, the bracket assembly 160 may further include a second bracket 163. The first end of the second bracket 163 is connected to the main body 110. The second end of the second bracket 163 extends toward the electromagnetic coil 141, and a second spacing is defined between the second end of the second bracket 163 and the electromagnetic coil 141. The starting and ending wires of the electromagnetic coil 141 are both connected to the second end of the second bracket 163 and extend along the second bracket 163 to the main body 110. The suspended wire portion between the electromagnetic coil 141 and the second end of the second bracket 163 forms a second flying lead 153. The length L1 of the second flying lead 153 and the second spacing S1 satisfy the following relationship: 1.05 < L1 / S1 < 1.5. By providing the second bracket 163, the wires of the electromagnetic coil 141 in the detection unit 150 can be routed along the second bracket 163 to the main body 110, thereby preventing the electromagnetic coil 141 from affecting the vibration state of the measuring tube 130 during routing, thereby further improving the detection accuracy of the mass flowmeter 100. By controlling the ratio of the length of the second flying wire 153 to the second spacing between 1.05-1.5, the tightness of the second flying wire 153 can be controlled within an appropriate range, thereby preventing the second flying wire 153 from affecting the detection accuracy of the mass flowmeter 100 due to being too loose or too tight.

[0059] In the above embodiment, the first bracket 161 and the second bracket 163 may each include a bracket body and a terminal block. The first end of the bracket body is connected to the main body 110, and the terminal block is rotatably connected to the second end of the bracket body. The electromagnetic coil 141 and the induction coil 151 are both connected to the corresponding terminal blocks, so that the tightness of the first flying lead 143 and / or the second flying lead 153 can be adjusted by rotating the terminal blocks. Specifically, the terminal block can be connected to the bracket body via bolts. After the tightness of the flying leads is adjusted, the bolts can be tightened to secure the terminal block and the bracket body together, thereby preventing changes in the tightness of the flying leads.

[0060] In the above embodiment, the bracket assembly 160 may further include a reinforcing bracket 162, which is connected to the main body 110, and the first bracket 161 and the second bracket 163 are both connected to the reinforcing bracket 162. The reinforcing bracket 162 can reinforce the first bracket 161 and the second bracket 163, thereby improving the stability of the first bracket 161 and the second bracket 163. At the same time, the reinforcing bracket 162 can also adjust the natural frequency of the first bracket 161 and the second bracket 163, thereby preventing resonance between the first bracket 161, the second bracket 163 and the measuring tube 130, thereby further improving the detection accuracy of the mass flowmeter 100.

[0061] In the above embodiment, the first bracket 161 and the second bracket 163 can be connected to one side of the reinforcing bracket 162 along the thickness direction of the shell 120, so that the terminal blocks of the first bracket 161 and the second bracket 163 can be conveniently extended from the side of the measuring tube 130, thereby being connected to the induction coil 151 and the electromagnetic coil 141 respectively, and avoiding the first bracket 161 and the second bracket 163 from interfering with the vibration of the measuring tube 130 as much as possible.

[0062] In the above embodiment, a distance can be provided between the first bracket 161 and the second bracket 163 along the thickness direction of the housing 120. This design can, on the one hand, make the overall structure formed by the first bracket 161, the second bracket 163 and the reinforcing bracket 162 more stable, and on the other hand, can avoid the housing 120 to a certain extent, thereby improving the structural compactness of the flow meter. Specifically, Figure 2 and Figure 6 As shown, one side of the reinforcing bracket 162 may have a notch 1621 , and the second bracket 163 may be inserted into the notch 1621 , thereby being staggered with the first bracket 161 along the width direction of the reinforcing bracket 162 .

[0063] In the above embodiment, the reinforcing bracket 162 can be constructed as a section of plate that is bent multiple times to form multiple folds 1622 on the surface of the reinforcing bracket 162. The first bracket 161 and the second bracket 163 are both connected to the ends of the fold 1622. The reinforcing bracket 162 is formed by bending a complete plate, which can improve the stiffness of the reinforcing bracket 162 and the reliability of the reinforcing bracket 162 in adjusting the natural frequencies of the first bracket 161 and the second bracket 163. At the same time, the first bracket 161 and the second bracket 163 are connected at the fold 1622, which can improve the stiffness of the reinforcing bracket 162 at the fold 1622 to a certain extent.

[0064] like Figure 2 As shown in the above embodiment, the extension direction of the fold 1622 can be the same as the thickness direction of the housing 120 (with Figure 2 The width direction of the middle reinforcing bracket 162 is consistent), and the extension direction of the fold 1622 has an angle with the length direction of the first bracket 161, thereby improving the ability of the reinforcing bracket 162 to adjust the natural frequency of the first bracket 161 and the second bracket 163. Specifically, the length directions of the first bracket 161, the second bracket 163 and the fold 1622 can be made perpendicular.

[0065] In the above embodiment, the distance L between the connection point of the reinforcing bracket 162 on the second bracket 163 and the second end of the second bracket 163 and the length L0 of the second bracket 163 satisfy the following relationship: 0.3 < L / L0 < 0.7. It will be appreciated that when the connection point of the reinforcing bracket 162 on the first bracket 161 changes, the length from that connection point to the free end of the end of the first bracket 161 will change accordingly, thereby affecting the natural frequency of the first bracket 161. If L / L0 is too large or too small, the natural frequency of the first bracket 161 may approach the natural frequency of the measuring tube 130, thereby risking resonance between the two. Therefore, ensuring that 0.3 < L / L0 < 0.7 can prevent resonance between the first bracket 161 and the measuring tube 130, thereby further improving the detection accuracy of the detection unit 150.

[0066] In the above embodiment, the ratio of the length A to the width B of the reinforcing bracket 162 can satisfy the following relationship: 1 < A / B < 30. It will be appreciated that by controlling the ratio of the length to the width of the reinforcing bracket 162, the degree of influence of the reinforcing bracket 162 on the natural frequency of the first bracket 161 can be controlled. A too small or too large aspect ratio of the reinforcing bracket 162 is not conducive to adjusting the natural frequency of the first bracket 161.

[0067] In the above embodiment, the measuring tube 130 includes a first measuring tube 131 and a second measuring tube 132, both of which have a U-shaped structure and are spaced apart and arranged opposite each other. The vibration unit 140 also includes a first magnet 142. The first magnet 142 is disposed at a position on the second measuring tube 132 corresponding to the electromagnetic coil 141 along the thickness direction of the housing 120. The electromagnetic coil 141 is configured to attract or repel the first magnet 142 when energized, thereby causing the first and second measuring tubes 131, 132 to vibrate. It will be understood that a periodically varying current can be passed through the electromagnetic coil 141, thereby periodically modifying the magnetic poles of the electromagnetic coil 141 and causing the electromagnetic coil 141 and the first magnet 142 to periodically switch between mutual attraction and repulsion, thereby causing the first and second measuring tubes 131, 132 to vibrate simultaneously. Specifically, the first and second measuring tubes 131, 132 can be parallel to each other.

[0068] In the above embodiment, there are two induction coils 151, both of which are arranged in the first measuring tube 131, and the two induction coils 151 are symmetrically distributed on both sides of the electromagnetic coil 141. The detection unit 150 also includes two second magnets 152, and the second magnets 152 are arranged at positions of the second measuring tube 132 corresponding to the induction coils 151. The induction coils 151 are configured to generate an induced current through the second magnets 152. It can be understood that when the first measuring tube 131 and the second measuring tube 132 vibrate, the induction coil 151 provided on the first measuring tube 131 and the second magnet 152 provided on the second measuring tube 132 will also move accordingly. In this way, the magnetic field generated by the second magnet 152 will change at the induction coil 151, thereby generating an induced current in the induction coil 151. Moreover, when fluid passes through the measuring tube 130, the measuring tube 130 will be twisted to a certain extent, thereby causing the vibration of the two induction coils 151 provided on both sides of the electromagnetic coil 141 to have a phase deviation. The mass flow rate of the fluid currently flowing through the measuring tube 130 can be indirectly calculated through this phase deviation.

[0069] In the above embodiment, the bracket assembly 160 is made of stainless steel or aluminum alloy with an elastic modulus greater than 10 GPa. However, if the elastic modulus of the first bracket 161 and the second bracket 163 is too low, their natural frequencies will be reduced, increasing the risk of resonance between the first bracket 161, the second bracket 163, and the measuring tube 130. Specifically, the first bracket 161 and the second bracket 163 can be made of stainless steel or aluminum alloy. Stainless steel and aluminum alloy not only have a high elastic modulus, which helps increase the natural frequencies of the first bracket 161 and the second bracket 163, but also have high structural strength, making the structure more stable and reliable.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mass flow meter, characterized in that The device comprises a main body, a housing, a measuring tube, a vibration unit, a detection unit and a bracket assembly, wherein at least part of the measuring tube, the vibration unit, the detection unit and at least part of the bracket assembly are arranged in the housing; Both ends of the measuring tube are connected to the main body, and the vibration unit and the detection unit are provided on the measuring tube. The vibration unit is used to vibrate the measuring tube, and the vibration unit includes an electromagnetic coil. The detection unit is used to detect the vibration state of the measuring tube, thereby deriving the mass flow rate flowing through the measuring tube according to the vibration state, and the detection unit includes an induction coil. The bracket assembly includes a first bracket, a first end of the first bracket is connected to the main body, a second end of the first bracket extends toward the induction coil, and a first distance is defined between the second end of the first bracket and the induction coil. The starting end wire and the ending wire of the induction coil are both connected to the second end of the first bracket and extend along the first bracket to the main body. The suspended wire portion between the induction coil and the second end of the first bracket forms a first flying lead, and the length L of the first flying lead and the first distance S satisfy the following relationship: 1.05<L / S<1.

5.

2. The mass flow meter according to claim 1, characterized in that The bracket assembly further includes a second bracket, wherein a first end of the second bracket is connected to the main body, a second end of the second bracket extends toward the electromagnetic coil, and a second distance is provided between the second end of the second bracket and the electromagnetic coil, and a starting end wire and an ending wire of the electromagnetic coil are both connected to the second end of the second bracket and extend along the second bracket to the main body; The wire portion suspended between the electromagnetic coil and the second end of the second bracket forms a second flying lead, and the length L1 of the second flying lead and the second spacing S1 satisfy the following relationship: 1.05<L1 / S1<1.

5.

3. The mass flow meter according to claim 2, characterized in that The first bracket and the second bracket each include a bracket body and a terminal block, the first end of the bracket body being connected to the main body, the terminal block being rotatably connected to the second end of the bracket body, the electromagnetic coil and the induction coil being connected to the corresponding terminal blocks so as to adjust the tightness of the first flying lead and / or the second flying lead by rotating the terminal blocks.

4. The mass flow meter according to claim 3, characterized in that The bracket assembly further includes a reinforcing bracket connected to the main body, and the first bracket and the second bracket are both connected to the reinforcing bracket.

5. The mass flow meter according to claim 4, characterized in that The first bracket and the second bracket are connected to one side of the reinforcing bracket along the thickness direction of the shell.

6. The mass flow meter according to claim 5, characterized in that There is a distance between the first bracket and the second bracket along the thickness direction of the housing.

7. The mass flow meter according to claim 6, characterized in that The reinforcing bracket is constructed as a plate that is bent multiple times to form multiple folds on the surface of the reinforcing bracket, and the first bracket and the second bracket are both connected to the ends of the folds.

8. The mass flow meter according to claim 7, characterized in that The extending direction of the fold is consistent with the thickness direction of the shell, and the extending direction of the fold forms an angle with the length direction of the first bracket.

9. The mass flow meter according to claim 4, characterized in that The distance L from the connection point of the reinforcing bracket on the second bracket to the second end of the second bracket and the length L0 of the second bracket satisfy the following relationship: 0.3<L / L0<0.

7.

10. The mass flow meter according to any one of claims 1 to 9, characterized in that: The measuring tubes include a first measuring tube and a second measuring tube, both of which are U-shaped structures, and are spaced apart and arranged opposite to each other; The vibration unit also includes a first magnet, which is arranged at a position of the second measuring tube corresponding to the electromagnetic coil along the thickness direction of the shell. The electromagnetic coil is configured to attract or repel the first magnet when energized, thereby causing the first measuring tube and the second measuring tube to vibrate.

11. The mass flow meter according to claim 10, characterized in that There are two induction coils, both of which are arranged on the first measuring tube and symmetrically distributed on both sides of the electromagnetic coil. The detection unit also includes two second magnets, which are arranged at positions of the second measuring tube corresponding to the induction coils. The induction coil is configured to generate an induced current through the second magnets.

12. The mass flow meter according to any one of claims 1 to 9, characterized in that: The bracket assembly is made of stainless steel or aluminum alloy material with an elastic modulus greater than 10 GPa.

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