Fluid detection device and mass flow meter

Abstract

The utility model relates to the technical field of fluid detection, and discloses a fluid detection device and a mass flowmeter, the device comprises a base, a measuring tube, a driving coil, two detection coils and a support assembly; the relation between the inherent frequency of the support assembly and the inherent frequency of the measuring tube meets the condition that P1 / P0 is larger than or equal to 1.1. P1 is the inherent frequency of the support assembly, and P0 is the inherent frequency of the measuring tube when the medium in the measuring tube is air. According to the fluid detection device, the situation that the inherent frequency of the support assembly is close to the inherent frequency of the measuring tube in the working process of the mass flow meter is avoided, the position of the lead is more reasonable, the measuring precision and stability of the measuring tube are further guaranteed, and the use scene of the fluid detection device is further increased.

Description

Technical Field

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

[0002] Mass flowmeters are common devices in the field of fluid detection, and usually include a drive coil and a detection coil. The drive coil is used to drive the vibration of the measuring tube, and the detection coil is used to detect the phase difference of the measuring tube.

[0003] However, existing methods for routing wires within mass flowmeters are not very rational. One method involves gluing the wires to the measuring tube, but this places the weight of the glue and wire on different locations on the tube, making it difficult to ensure measurement accuracy and stability. Another method involves gluing the wires to the protective shell, which can easily cause the wires to melt during subsequent welding of the shell. Yet another method involves gluing the wires directly to the column below the measuring tube. However, this method is only suitable for measuring tubes with a small degree of curvature and can only accommodate coils on the inside of the tube, limiting its application scenarios.

[0004] Therefore, how to ensure the measurement accuracy and stability of the mass flow meter while also ensuring its service life and increasing its application scenarios has become a technical problem that needs to be urgently solved in this field. Utility Model Content

[0005] The purpose of this utility model is to at least solve the problem of how to ensure the measurement accuracy and stability of the mass flow meter while also ensuring the service life of the mass flow meter and increasing the number of application scenarios. This purpose is achieved through the following technical solutions:

[0006] In the first aspect, the utility model proposes a fluid detection device, which is located inside the shell of a mass flowmeter, and the fluid detection device includes: a base; a measuring tube, both ends of which are connected to the base respectively; a driving coil, which is installed in the middle position of the measuring tube along the extension direction of the measuring tube; two detection coils, both installed in the measuring tube, and the two detection coils are at the same distance from the driving coil along the extension direction of the measuring tube; and a bracket assembly, which is installed on the base, and the bracket assembly is connected to the detection lead led out from the detection coil and the drive lead led out from the drive coil; the relationship between the natural frequency of the bracket assembly and the natural frequency of the measuring tube satisfies: P1 / P0≥1.1; wherein P1 is the natural frequency of the bracket assembly, and P0 is the natural frequency of the measuring tube itself when the medium in the measuring tube is air.

[0007] This fluid detection device, because P1 / P0 ≥ 1.1, that is, the natural frequency of the bracket assembly is significantly greater than the natural frequency of the measuring tube itself when the medium in the measuring tube is air, avoids the phenomenon that the natural frequency of the bracket assembly is close to the natural frequency of the measuring tube when the mass flowmeter is working, thereby ensuring the measurement accuracy of the measuring tube. In addition, the driving lead of the driving coil can be fixedly connected to the bracket assembly after being pulled out, and then connected to the base along the bracket assembly through other leads; the detection lead of the detection coil can also be fixedly connected to the bracket assembly after being pulled out, and then connected to the base along the bracket assembly through other leads; thereby making the position of the lead more reasonable, further ensuring the measurement accuracy and stability of the measuring tube. Moreover, this setting method is applicable to measuring tubes of any shape, and the driving coil and detection coil can be installed on the inside or outside of the measuring tube, which increases the use scenarios of the fluid detection device.

[0008] In some embodiments of the present invention, the bracket assembly includes: a basic bracket, including a first bracket and two second brackets, the first end of the first bracket is connected to the base, and the second end of the first bracket is connected to the driving lead led out from the driving coil; the two second brackets are arranged one-to-one with the two detection coils; in any group of mutually corresponding second brackets and detection coils, the first end of the second bracket is connected to the base, and the second end of the second bracket is connected to the detection lead led out from the detection coil; and a reinforcing bracket, fixedly installed on the base, the first bracket and the two second brackets are all connected to the reinforcing bracket.

[0009] In some embodiments of the present invention, the positional relationship between the basic bracket and the reinforcement bracket satisfies: 0.3<a<0.7; a=L1\L10, and\or, a=L2\L20; wherein, L1 is the distance between the connection between the first bracket and the base and the connection between the first bracket and the reinforcement bracket, L10 is the distance from the connection between the first bracket and the base to the second end of the first bracket, L2 is the distance between the connection between the second bracket and the base and the connection between the second bracket and the reinforcement bracket, and L20 is the distance from the connection between the second bracket and the base to the second end of the second bracket.

[0010] In some embodiments of the present invention, the reinforcing bracket includes: a first plate, the first end of the first plate is connected to the base; a second plate, which is spaced apart from the first plate along the first direction, and the first end of the second plate is connected to the base; a third plate, the first end of the third plate is connected to the second end of the first plate; and a fourth plate, the first end of the fourth plate is connected to the second end of the second plate, and the second end of the fourth plate is connected to the second end of the third plate, and the connection position between the fourth plate and the third plate constitutes the connection between the first bracket and the reinforcing bracket.

[0011] In some embodiments of the present invention, a mounting groove is provided on the base, and along the first direction, the mounting groove is located in the middle position of the base, and the mounting groove extends along the first direction; the first end of the first bracket is fixedly connected to the inner wall of the mounting groove, and the first end of the second bracket is fixedly connected to the inner wall of the mounting groove, and along the first direction, the first ends of the two second brackets are respectively located on both sides of the first end of the first bracket.

[0012] In some embodiments of the present invention, the aspect ratio of the reinforcing bracket satisfies: 1<i<30; i=A\B; wherein i is the aspect ratio of the reinforcing bracket, A is the length of the reinforcing bracket in the first direction, B is the width of the reinforcing bracket in the second direction, the second direction is perpendicular to the first direction, and the plane in which the first direction and the second direction are located is parallel to the extension direction of the base.

[0013] In some embodiments of the present invention, the first bracket is a plate-shaped structure, and a first connecting plate is provided at the second end of the first bracket, and the first connecting plate is connected to the driving lead led out from the driving coil; the two second brackets are both plate-shaped structures, and a second connecting plate is provided at the second end of each second bracket, and the second connecting plate is connected to the detection lead led out from the corresponding detection coil.

[0014] In some embodiments of the present invention, the first connecting plate and the second end of the first bracket are both provided with a first threaded hole, and the first connecting plate is connected to the second end of the first bracket through a first screw; the second connecting plate and the second end of the corresponding second bracket are both provided with a second threaded hole, and the second connecting plate is connected to the second end of the corresponding second bracket through a second screw.

[0015] In some embodiments of the present invention, the connection positions of the driving lead and the detection lead with the base bracket satisfy: 1.05<b<1.5; b=l\s; where l is the length of the suspended section of the driving lead or the detection lead, and s is the straight-line distance between the two end points of the driving lead or the detection lead.

[0016] In a second aspect, the present invention provides a mass flow meter, which includes any one of the above-mentioned fluid detection devices.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0019] Figure 1 A schematic structural diagram of a fluid detection device provided by an embodiment of the present utility model at an angle;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 A schematic structural diagram of a fluid detection device provided by an embodiment of the present utility model at another angle;

[0022] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0023] Figure 5 A schematic structural diagram of another fluid detection device provided by an embodiment of the present utility model;

[0024] Figure 6 A schematic diagram of the structure of the fluid detection device provided by an embodiment of the present utility model when the protective shell is installed;

[0025] Figure 7 A schematic diagram of the connection relationship between a base bracket and a reinforcement bracket in a fluid detection device provided by an embodiment of the present utility model;

[0026] Figure 8 A schematic structural diagram of a reinforcing bracket in a fluid detection device provided by an embodiment of the present utility model;

[0027] The reference numerals are as follows:

[0028] 100. Fluid detection device;

[0029] 1. Base; 11. Mounting slot;

[0030] 2. Measuring tube;

[0031] 3. Driving coil; 31. First coil body; 32. First magnetic steel body;

[0032] 4. Detection coil; 41. Second coil body; 411. Detection lead; 42. Second magnetic steel body;

[0033] 5. Base bracket; 51. First bracket; 511. First connecting plate; 512. First threaded hole; 52. Second bracket; 521. Second connecting plate; 522. Second screw;

[0034] 6. Reinforcement bracket; 61. First plate; 62. Second plate; 63. Third plate; 64. Fourth plate; 65. Groove;

[0035] 71, first support frame; 711, first coil support frame; 712, first magnetic steel support frame; 72, second support frame; 721, second coil support frame; 722, second magnetic steel support frame; 723, mounting screws;

[0036] 8. Protective case;

[0037] 9. Pillar. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0040] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0041] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0042] Figure 1 A schematic structural diagram of a fluid detection device provided by an embodiment of the present utility model at an angle; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 A schematic structural diagram of a fluid detection device provided by an embodiment of the present utility model at another angle; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 A schematic diagram of another fluid detection device provided by an embodiment of the present invention; Figures 1 to 5The embodiment of the present invention provides a fluid detection device 100, which is located inside the housing of the mass flowmeter. The fluid detection device 100 includes: a base 1; a measuring tube 2, both ends of which are connected to the base 1 respectively; a driving coil 3, which is installed in the middle position of the measuring tube 2 along the extension direction of the measuring tube 2; two detection coils 4, which are both installed in the measuring tube 2, and the distance between the two detection coils 4 and the driving coil 3 is the same along the extension direction of the measuring tube 2; and a bracket assembly, which is installed on the base 1, and the bracket assembly is connected to the detection lead 411 led out from the detection coil 4 and the drive lead led out from the drive coil 3;

[0043] The natural frequency of the bracket assembly and the natural frequency of the measuring tube 2 satisfy:

[0044] P1 / P0 ≥ 1.1;

[0045] Wherein, P1 is the natural frequency of the bracket assembly, and P0 is the natural frequency of the measuring tube 2 itself when the medium in the measuring tube 2 is air.

[0046] In this embodiment, when the mass flowmeter is working, since P1 / P0≥1.1, that is, the natural frequency of the bracket assembly is significantly greater than the natural frequency of the measuring tube 2 itself when the medium in the measuring tube 2 is air, the phenomenon that the natural frequency of the bracket assembly is close to the natural frequency of the measuring tube 2 when the mass flowmeter is working is avoided, thereby ensuring the measurement accuracy of the measuring tube 2.

[0047] In addition, after the drive lead of the drive coil 3 is pulled out, it can be fixedly connected to the bracket assembly, and then connected to the base through other leads along the bracket assembly; after the detection lead 411 of the detection coil 4 is pulled out, it can also be fixedly connected to the bracket assembly, and then connected to the base 1 along the bracket assembly through other leads; thereby making the position of the lead more reasonable, further ensuring the measurement accuracy and stability of the measuring tube 2. Moreover, this setting method is applicable to measuring tubes 2 of any shape, and the drive coil 3 and detection coil 4 can be installed on the inside or outside of the measuring tube 2, increasing the use scenarios of the fluid detection device 100.

[0048] refer to Figure 1 、 Figure 3 and Figure 5As an optional embodiment of the present invention, the bracket assembly includes: a basic bracket 5, including a first bracket 51 and two second brackets 52, the first end of the first bracket 51 is connected to the base 1, and the second end of the first bracket 51 is connected to the driving lead led out from the driving coil 3; the two second brackets 52 are arranged one-to-one with the two detection coils 4; in any group of corresponding second brackets 52 and detection coils 4, the first end of the second bracket 52 is connected to the base 1, and the second end of the second bracket 52 is connected to the detection lead 411 led out from the detection coil 4; and a reinforcing bracket 6, fixedly installed on the base 1, the first bracket 51 and the two second brackets 52 are all connected to the reinforcing bracket 6.

[0049] In this embodiment, the driving lead of the driving coil 3 can be fixedly connected to the second end of the first bracket 51 after being pulled out, and then connected to the base 1 along the first bracket 51 through the first auxiliary lead; the detection lead 411 of the detection coil 4 can be fixedly connected to the second end of the corresponding second bracket 52 after being pulled out, and then connected to the base 1 along the second bracket through the second auxiliary lead; thereby making the position of the lead more reasonable, further ensuring the measurement accuracy and stability of the measuring tube 2.

[0050] Moreover, the base bracket 5 and the reinforcing bracket 6 can be connected by welding, and the driving lead can be bonded to the second end of the first bracket 51 by adhesive tape after being pulled out, and the detection lead 411 of the detection coil 4 can be bonded to the second end of the corresponding second bracket 52 by adhesive tape after being pulled out;

[0051] In addition, the first auxiliary lead can be set on the outer wall of the first bracket 51 or inside the first bracket 51; similarly, the second auxiliary lead can also be set on the outer wall or inside the second bracket 52, depending on actual needs;

[0052] besides, Figure 6 This is a schematic diagram of the structure of the fluid detection device provided by the embodiment of the utility model when the protective shell is installed, and reference is made to Figure 6 The fluid detection device 100 may also include a protective shell 8 and a column 9. The protective shell 8 is fixedly connected to the base 1. The protective shell 8 has an inner cavity. The measuring tube 2, the bracket assembly, the driving coil 3 and the two detection coils 4 are all arranged in the inner cavity to protect the fluid detection device 100; one end of the column 9 is connected to the base 1, and the other end is used to connect to the meter head.

[0053] Figure 7 A schematic diagram of the connection relationship between the base bracket and the reinforcement bracket in a fluid detection device provided by an embodiment of the present utility model is shown as follows: Figure 7 As shown, as an optional embodiment of the present invention, the positional relationship between the basic bracket 5 and the reinforcing bracket 6 satisfies:

[0054] 0.3<a<0.7;

[0055] a=L1\L10, and\or, a=L2\L20;

[0056] Among them, L1 is the distance between the connection between the first bracket 51 and the base 1 and the connection between the first bracket 51 and the reinforcement bracket 6, L10 is the distance from the connection between the first bracket 51 and the base 1 to the second end of the first bracket 51, L2 is the distance between the connection between the second bracket 52 and the base 1 and the connection between the second bracket 52 and the reinforcement bracket 6, and L20 is the distance from the connection between the second bracket 52 and the base 1 to the second end of the second bracket 52.

[0057] In this embodiment, since the connection position of the basic bracket 5 and the reinforcement bracket 6 affects the natural frequency of the entire bracket assembly, data simulation shows that when 0.3<a<0.7, it is easier to meet P1 / P0≥1.1, thereby ensuring the measurement accuracy of the measuring tube 2.

[0058] In addition, since the larger the elastic modulus and the lower the density, the more conducive it is to improving the natural frequency of the rigid structure, therefore, on the premise of ensuring that the bracket assembly has sufficient supporting force, the material of the bracket assembly can be selected from metal materials (such as stainless steel, aluminum alloy, etc.) with a large elastic modulus (for example, greater than 10Gpa).

[0059] Figure 8 This is a structural diagram of a reinforcing bracket in a fluid detection device provided by an embodiment of the present invention, with reference to Figure 7 and Figure 8 As an optional embodiment of the present invention, the reinforcing bracket 6 includes: a first plate 61, a first end of the first plate 61 is connected to the base 1; a second plate 62, spaced apart from the first plate 61 along the first direction, and a first end of the second plate 62 is connected to the base 1; a third plate 63, a first end of the third plate 63 is connected to the second end of the first plate 61; and a fourth plate 64, a first end of the fourth plate 64 is connected to the second end of the second plate 62, and a second end of the fourth plate 64 is connected to the second end of the third plate 63, and the connection position between the fourth plate 64 and the third plate 63 constitutes the connection between the first bracket 51 and the reinforcing bracket 6.

[0060] In this embodiment, the reinforcing bracket 6 includes a first plate 61, a second plate 62, a third plate 63 and a fourth plate 64, which can conveniently adjust the connection position of the basic bracket 5 and the reinforcing bracket 6, so that 0.3<a<0.7 can be more conveniently satisfied, thereby facilitating the guarantee of the measurement accuracy of the measuring tube 2.

[0061] Specifically, after the shape of the reinforcing bracket 6 is determined, the first plate 61 and the third plate 63, the third plate 63 and the fourth plate 64, and the fourth plate 64 and the second plate 62 can be connected by welding;

[0062] In addition, a groove 65 may be provided at the connection position between the third plate 63 and the fourth plate 64 to facilitate welding the first bracket 51 to the groove 65 .

[0063] refer to Figure 1 and Figure 5 As an optional embodiment of the present invention, a mounting groove 11 is provided on the base 1. Along the first direction, the mounting groove 11 is located in the middle position of the base 1, and the mounting groove 11 extends along the first direction; the first end of the first bracket 51 is fixedly connected to the inner wall of the mounting groove 11, and the first end of the second bracket 52 is fixedly connected to the inner wall of the mounting groove 11, and along the first direction, the first ends of the two second brackets 52 are respectively located on both sides of the first end of the first bracket 51.

[0064] In this embodiment, during assembly, the relative positions of the second bracket 52, the first bracket 51 and the reinforcing bracket 6 can be adjusted in the first direction according to actual working conditions, so that the condition of 0.3<a<0.7 can be met more conveniently, thereby more effectively ensuring the measurement accuracy of the measuring tube 2.

[0065] Specifically, after the relative positions of the second bracket 52, the first bracket 51 and the reinforcing bracket 6 are adjusted, the first end of the first bracket 51 can be welded to the inner wall of the mounting groove 11, and the first end of the second bracket 52 can also be welded to the inner wall of the mounting groove 11. The welding connection is firm, thereby ensuring the stability of the first bracket 51 and the second bracket 52.

[0066] In addition, as described above, when routing, the driving lead of the driving coil 3 can be fixedly connected to the second end of the first bracket 51 after being pulled out, and then connected to the base 1 along the first bracket 51 through the first auxiliary lead; the detection lead 411 of the detection coil 4 can be fixedly connected to the second end of the corresponding second bracket 52 after being pulled out, and then connected to the base 1 along the second bracket through the second auxiliary lead. It is easy to understand that the provision of the mounting groove 11 can provide a better routing position for the first auxiliary lead and the second auxiliary lead on the base 1, making the overall routing position of the fluid detection device 100 more reasonable and the connection more convenient, thereby further ensuring the measurement accuracy and stability of the measuring tube 2.

[0067] like Figure 8 As shown, as an optional embodiment of the present invention, the aspect ratio of the reinforcing bracket 6 satisfies:

[0068] 1<i<30;

[0069] i=A\B;

[0070] Among them, i is the aspect ratio of the reinforcing bracket 6, A is the length of the reinforcing bracket 6 in the first direction, B is the width of the reinforcing bracket 6 in the second direction, the second direction is perpendicular to the first direction, and the plane in which the first direction and the second direction are located is parallel to the extension direction of the base 1.

[0071] In this embodiment, similarly, since the connection position of the basic bracket 5 and the reinforcing bracket 6 will affect the natural frequency of the entire bracket assembly, the aspect ratio of the reinforcing bracket 6 also has a reasonable range. Through data simulation, it is found that when 1<i<30, it is easier to meet P1 / P0≥1.1, thereby ensuring the measurement accuracy of the measuring tube 2.

[0072] refer to Figure 4 As an optional embodiment of the present invention, the connection positions of the driving lead and the detection lead 411 and the base bracket 5 meet the following requirements:

[0073] 1.05<b<1.5;

[0074] b=l\s;

[0075] Wherein, l is the length of the suspended section of the driving lead or detection lead 411, and s is the straight-line distance between the two endpoints of the driving lead or detection lead 411. That is, when l is the length of the suspended section of the driving lead, s is the straight-line distance between the two endpoints of the driving lead; when l is the length of the suspended section of the detection lead 411, s is the straight-line distance between the two endpoints of the detection lead 411.

[0076] In this embodiment, it is easy to understand that since the drive lead is a lead extended from the drive coil 3 and the detection lead 411 is a lead extended from the detection coil 4, both need to maintain appropriate tightness. If the extended leads are too loose or too tight, the electrical performance of the drive coil 3 and the detection coil 4 will be affected.

[0077] Therefore, this embodiment limits the driving lead and the detection lead 411. When the connection position of the driving lead and the detection lead 411 with the basic bracket 5 satisfies 1.05<b<1.5, the driving lead and the detection lead 411 will not be too tight or too loose, thereby ensuring the measurement accuracy of the measuring tube 2.

[0078] It should be noted that the length of the suspended section of the driving lead or the detection lead 411 is the length of the lead extended from the driving coil 3 or the detection coil 4; the straight-line distance between the two end points of the driving lead or the detection lead 411 is the straight-line distance between the two end points of the extended lead; taking the detection lead 411 as an example, refer to Figure 4 , Figure 4 The straight-line distance s between the two end points of the detection lead 411 is clearly shown in FIG.

[0079] refer to Figures 1 to 7 Specifically, as an optional embodiment of the present invention, the first bracket 51 is a plate-shaped structure, and the second end of the first bracket 51 is provided with a first connecting plate 511, and the first connecting plate 511 is connected to the driving lead led out from the driving coil 3; the two second brackets 52 are both plate-shaped structures, and the second end of each second bracket 52 is provided with a second connecting plate 521, and the second connecting plate 521 is connected to the detection lead 411 led out from the corresponding detection coil 4.

[0080] Specifically, the first connecting plate 511 and the second end of the first bracket 51 are both provided with a first threaded hole 512, and the first connecting plate 511 is connected to the second end of the first bracket 51 through a first screw; the second connecting plate 521 and the second end of the corresponding second bracket 52 are both provided with a second threaded hole, and the second connecting plate 521 is connected to the second end of the corresponding second bracket 52 through a second screw 522.

[0081] In this embodiment, in order to more conveniently adjust the tightness of the drive lead and the detection lead 411, the first connecting plate 511 and the second connecting plate 521 are configured as a rotatable and adjustable structure. Taking the drive lead as an example, before connecting the drive lead, the first connecting plate 511 is first rotated relative to the first bracket 51 using the first screw as the rotation axis until the first connecting plate 511 rotates to the appropriate position. The first screw is then tightened to connect the drive lead to the first connecting plate 511. It should be noted that to further ensure the stability of the connection, after the first screw is tightened, the first connecting plate 511 can be welded to the first bracket 51. Similarly, the position of the second connecting plate 521 needs to be adjusted before connecting the detection lead 411. The specific method will not be repeated here.

[0082] Therefore, this setting method can more conveniently adjust the tightness of the driving lead and the detection lead 411, so that the connection positions of the driving lead and the detection lead 411 and the basic bracket 5 both meet 1.05<b<1.5, thereby ensuring the working performance of the driving coil 3 and the detection coil 4.

[0083] like Figure 2 and Figure 4 As shown, as an optional embodiment of the present invention, the driving coil 3 includes a first coil body 31 and a first magnetic steel body 32 , and the detecting coil 4 includes a second coil body 41 and a second magnetic steel body 42 .

[0084] In this embodiment, the first coil body 31 can be an exciter coil, and the first magnetic steel body 32 can be an exciter magnetic steel body; when the exciter coil is energized, a periodically changing excitation force can be generated between the measuring tube 2 and the exciter magnetic steel body, thereby realizing the vibration of the measuring tube 2.

[0085] Continue to refer Figure 2 and Figure 4As an optional embodiment of the present invention, the fluid detection device 100 also includes: a first support frame 71, installed on the measuring tube 2, and the first support frame 71 is used to install the driving coil 3; and two second support frames 72, both installed on the measuring tube 2, and the two second support frames 72 are arranged in a one-to-one correspondence with the two detection coils 4, and the second support frames 72 are used to install the corresponding detection coils 4.

[0086] The first support frame 71 and the second support frame 72 can be welded to the measuring tube 2 .

[0087] In addition, it is easy to understand that when the driving coil 3 includes the first coil body 31 and the first magnetic steel body 32, and the detection coil 4 includes the second coil body 41 and the second magnetic steel body 42: the first support frame 71 may include a first coil support frame 711 and a first magnetic steel support frame 712, the first coil support frame 711 is used to install the first coil body 31, and the first magnetic steel support frame 712 is used to install the first magnet; the second support frame 72 may include a second coil support frame 721 and a second magnetic steel support frame 722, the second coil support frame 721 is used to install the second coil body 41, and the second magnetic steel support frame 722 is used to install the second magnetic steel body 42. Taking the installation of the second magnetic steel body 42 as an example, the second magnetic steel body 42 can be installed on the second magnetic steel support frame 722 by installing screws 723.

[0088] In this embodiment, the first support frame 71 and the second support frame 72 can be arranged on the inner side of the measuring tube 2 or on the outer side of the measuring tube 2; it should be noted that since the two detection coils 4 are symmetrically distributed relative to the measuring tube 2, the two second support frames 72 can only be located on the inner side of the measuring tube 2 or on the outer side of the measuring tube 2 at the same time.

[0089] An embodiment of the present invention further provides a mass flow meter, which includes any one of the above-mentioned fluid detection devices 100 .

[0090] Among them, the mass flowmeter also includes a shell, a column 9 and a head. The fluid detection device 100 is installed in the inner cavity of the shell. One end of the column 9 is connected to the base 1 of the fluid detection device 100, and the other end is connected to the head. It should be noted that a junction box can be set between the column 9 and the head according to actual needs to realize the transmission of remote electrical signals.

[0091] In this embodiment, the beneficial effects of the mass flow meter are the same as those of any of the above-mentioned fluid detection devices 100 and are not described in detail.

[0092] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A fluid detection device, located inside the housing of a mass flow meter, characterized in that: include: base; A measuring tube, both ends of which are connected to the base respectively; A driving coil is installed in the middle of the measuring tube along the extending direction of the measuring tube; Two detection coils are both installed on the measuring tube, and along the extension direction of the measuring tube, the two detection coils are at the same distance from the driving coil; as well as a bracket assembly mounted on the base, the bracket assembly being connected to both a detection lead wire led out of the detection coil and a drive lead wire led out of the drive coil; The relationship between the natural frequency of the bracket assembly and the natural frequency of the measuring tube satisfies: P1 / P0 ≥ 1.1; Wherein, P1 is the natural frequency of the bracket assembly, and P0 is the natural frequency of the measuring tube itself when the medium in the measuring tube is air.

2. The fluid detection device according to claim 1, characterized in that: The bracket assembly includes: A basic bracket includes a first bracket and two second brackets, wherein a first end of the first bracket is connected to the base, and a second end of the first bracket is connected to a driving lead extending from the driving coil; two second brackets are arranged one-to-one with two detection coils; in any set of corresponding second brackets and detection coils, a first end of the second bracket is connected to the base, and a second end of the second bracket is connected to a detection lead extending from the detection coil; and A reinforcing bracket is fixedly mounted on the base, and the first bracket and the two second brackets are all connected to the reinforcing bracket.

3. The fluid detection device according to claim 2, characterized in that: The positional relationship between the basic support and the reinforcement support satisfies: 0.3＜a＜0.7； a=L1\L10, and\or, a=L2\L20; Among them, L1 is the distance between the connection between the first bracket and the base and the connection between the first bracket and the reinforcing bracket, L10 is the distance from the connection between the first bracket and the base to the second end of the first bracket, L2 is the distance between the connection between the second bracket and the base and the connection between the second bracket and the reinforcing bracket, and L20 is the distance from the connection between the second bracket and the base to the second end of the second bracket.

4. The fluid detection device according to claim 3, characterized in that: The reinforcement bracket comprises: a first plate, wherein a first end of the first plate is connected to the base; a second plate, spaced apart from the first plate along a first direction, wherein a first end of the second plate is connected to the base; a third plate, a first end of the third plate being connected to the second end of the first plate; and A fourth plate, wherein the first end of the fourth plate is connected to the second end of the second plate, the second end of the fourth plate is connected to the second end of the third plate, and the connection position between the fourth plate and the third plate constitutes the connection between the first bracket and the reinforcing bracket.

5. The fluid detection device according to claim 4, characterized in that: The base is provided with a mounting groove, which is located in the middle of the base along the first direction and extends along the first direction; The first end of the first bracket is fixedly connected to the inner wall of the mounting groove, the first end of the second bracket is fixedly connected to the inner wall of the mounting groove, and along the first direction, the first ends of the two second brackets are respectively located on both sides of the first end of the first bracket.

6. The fluid detection device according to claim 4, characterized in that: The aspect ratio of the reinforcing bracket satisfies: 1＜i＜30； i=A\B; Among them, i is the aspect ratio of the reinforcing bracket, A is the length of the reinforcing bracket in the first direction, B is the width of the reinforcing bracket in the second direction, the second direction is perpendicular to the first direction, and the plane in which the first direction and the second direction are located is parallel to the extension direction of the base.

7. The fluid detection device according to any one of claims 2 to 6, characterized in that: The first bracket is a plate-shaped structure, and a first connecting plate is provided at the second end of the first bracket, and the first connecting plate is connected to the driving lead led out from the driving coil; Both of the second brackets are plate-shaped structures. A second connecting plate is provided at the second end of each second bracket. The second connecting plate is connected to a detection lead wire led out from the corresponding detection coil.

8. The fluid detection device according to claim 7, characterized in that: The first connecting plate and the second end of the first bracket are both provided with a first threaded hole, and the first connecting plate is connected to the second end of the first bracket by a first screw; The second connecting plate and the second end of the corresponding second bracket are both provided with a second threaded hole, and the second connecting plate is connected to the second end of the corresponding second bracket through a second screw.

9. The fluid detection device according to claim 8, characterized in that: The connection positions of the driving lead and the detection lead with the base bracket satisfy: 1.05＜b＜1.5； b=l\s; Wherein, l is the length of the suspended section of the driving lead or the detecting lead, and s is the straight-line distance between the two end points of the driving lead or the detecting lead.

10. A mass flow meter, characterized in that: The device comprises the fluid detection device according to any one of claims 1 to 9.

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