Mass flowmeter capable of resisting installation deviation

Abstract

The utility model provides a mass flow meter capable of resisting installation deviation. The mass flow meter capable of resisting installation deviation comprises a flow meter body, two floating connecting pipes and two elastic pre-tightening mechanisms. Body connecting pipes are arranged at the two ends of the flowmeter body respectively, convex spherical sealing faces are formed on the outer walls of the body connecting pipes, concave spherical sealing faces are formed on the inner walls of the floating connecting pipes, and the convex spherical sealing faces and the concave spherical sealing faces are attached to form a spherical sealing pair. The elastic pre-tightening mechanism is used for applying axial pre-tightening force towards the body connecting pipe to the floating connecting pipe so as to maintain the sealing performance of the spherical sealing pair. When an external pipeline has angle deviation or slight radial dislocation, the floating connecting pipe can freely and finely adjust the posture around the sphere center of the spherical sealing pair, automatic compensation of the angle deviation and the slight radial dislocation of the pipeline in the installation process is achieved, and mechanical stress generated by the deviation is prevented from being transmitted to a vibration pipe of the flowmeter body. The metering precision problems such as zero drift and abnormal measurement are solved fundamentally, and the long-term metering stability and reliability of the flowmeter are improved remarkably.

Description

Technical Field

[0001] This utility model relates to the field of mass flow meter technology, and specifically to a mass flow meter resistant to installation deviation. Background Technology

[0002] The Coriolis mass flow meter calculates mass flow by detecting the phase difference generated by the vibrating tube under the action of fluid. Therefore, the structural symmetry of the vibrating tube and the absence of external force interference are the core prerequisites for ensuring measurement accuracy.

[0003] During actual industrial installation, due to various factors such as construction errors, insufficient pipeline laying accuracy, and equipment installation benchmark deviations, installation deviations such as radial misalignment or angular deflection are prone to occur when connecting upstream and downstream pipelines to the mass flow meter. These deviations transmit additional mechanical stress to the vibrating tube of the mass flow meter. This stress disrupts the inherent equilibrium state of the vibrating tube, changes its inherent vibration frequency, and leads to problems such as zero drift and inaccurate density measurement. In severe cases, it can even cause metering failure, affecting the accurate measurement and control of industrial production. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a mass flow meter that is resistant to installation deviation, so as to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides a mass flow meter resistant to installation deviation, comprising a flow meter body with body connectors at both ends, the outer wall of the body connector forming a convex spherical sealing surface with the center of the convex spherical sealing surface located on the axis of the body connector; two floating connectors, each corresponding to one body connector, the inner wall of the floating connector forming a concave spherical sealing surface, the concave spherical sealing surface and the convex spherical sealing surface having the same center of gravity and radius of curvature, the two fitting together to form a spherical sealing pair; and two elastic pre-tightening mechanisms, each elastic pre-tightening mechanism corresponding to a set of body connectors and floating connectors, the elastic pre-tightening mechanism being used to apply an axial pre-tightening force toward the body connector to the floating connector to maintain the sealing performance of the spherical sealing pair.

[0006] Preferably, the elastic pre-tightening mechanism includes: a pre-tightening force-bearing flange, which is annular in structure and coaxially fixed to the outer wall of the floating pipe; a body connecting flange, which is annular in structure and coaxially fixed to the outer wall of the body pipe; a floating connecting ring, which is arranged around the outer periphery of the floating pipe; a plurality of fixing components for connecting the floating connecting ring and the body connecting flange, and aligning the axes of the floating connecting ring and the body connecting flange, wherein the plurality of fixing components are arranged in a circular array along the axis of the body connecting flange; and a plurality of pre-tightening components for applying an axial pre-tightening force toward the body pipe towards the pre-tightening force-bearing flange after the floating connecting ring is connected to the body connecting flange.

[0007] Preferably, the pre-tightening assembly includes a guide post, a disc spring assembly, a loading block, and an adjusting bolt; the guide post is located on the side of the pre-tightening flange opposite to the main body connecting flange, and the axis of the guide post is parallel to the axis of the floating pipe; the disc spring assembly passes through the guide post; the loading block abuts against the disc spring assembly, and the adjusting bolt is threaded onto the floating connecting ring and connected to the loading block.

[0008] Preferably, the loading block has a relief groove for accommodating the guide post, and the inner diameter of the relief groove is larger than the outer diameter of the guide post.

[0009] Preferably, the end face of the main body connecting flange facing the floating connecting ring is provided with a plurality of positioning holes, and the plurality of positioning holes are arranged in a circular array along the axis of the main body connecting flange; the end face of the floating connecting ring facing the main body connecting flange is provided with a plurality of positioning pins, and each positioning pin can be inserted into the corresponding positioning hole.

[0010] Preferably, the inner diameter of the floating connecting ring is larger than the outer diameter of the pre-tightening flange.

[0011] Preferably, the convex spherical sealing surface is provided with multiple grooves, the grooves extending circumferentially along the main body connector, and each groove is provided with a sealing ring.

[0012] The beneficial effects of this utility model are:

[0013] This utility model discloses a mass flow meter resistant to installation deviation. By designing floating pipes and elastic pre-tightening mechanisms at the inlet and outlet ends of the flow meter body, when there is angular deviation or slight radial misalignment in the external pipeline, the floating pipe can freely adjust its posture around the center of the spherical sealing pair, realizing automatic compensation for angular deviation and slight radial misalignment of the pipeline during installation. This avoids the mechanical stress caused by the deviation from being transmitted to the vibrating tube of the flow meter body, fundamentally solving the metering accuracy problems such as zero drift and measurement anomalies, and significantly improving the long-term metering stability and reliability of the flow meter.

[0014] Meanwhile, the axial preload applied by the elastic preload mechanism ensures that the spherical sealing pair remains tightly fitted, achieving a stable and reliable sealing effect while guaranteeing anti-deviation function and preventing fluid leakage. Because the vibrating tube is free from additional mechanical stress, it maintains its inherent vibration frequency and symmetrical structure, effectively avoiding problems such as zero-point drift and abnormal density measurement, significantly improving the long-term metering accuracy and stability of the flow meter. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of a mass flow meter resistant to installation deviation provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the flow meter body.

[0018] Figure 3 This is a partial schematic diagram of the convex spherical sealing surface;

[0019] Figure 4 This is a schematic diagram of the floating nozzle structure;

[0020] Figure 5 This is a cross-sectional schematic diagram of the floating nozzle;

[0021] Figure 6 This is a schematic diagram of the floating connecting ring structure;

[0022] Figure 7 This is a schematic diagram of the structure on the other side of the floating connecting ring;

[0023] Figure 8 This is a schematic diagram of the structure of the disc spring assembly and the guide post.

[0024] Figure 9 A schematic diagram of the structure for adjusting the bolt and the loading block;

[0025] Figure 10 A cross-sectional schematic diagram showing the coordination between the floating nozzle, the main nozzle, and the elastic preload mechanism;

[0026] Figure label:

[0027] 10. Flowmeter body; 11. Body connector; 12. Outer convex spherical sealing surface; 13. Groove; 20. Floating connector; 21. Inner concave spherical sealing surface; 30. Pre-tightening flange; 40. Body connecting flange; 41. Positioning hole; 50. Floating connecting ring; 51. Support arm; 52. Positioning pin; 60. Fixing assembly; 70. Pre-tightening assembly; 71. Guide column; 72. Disc spring assembly; 73. Loading block; 731. Relief groove; 74. Adjusting bolt; 80. Sealing ring. Detailed Implementation

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] like Figure 1-10 As shown, in one embodiment of this utility model, a mass flow meter resistant to installation deviation is provided, including a flow meter body 10, two floating connectors 20, and two elastic pre-tightening mechanisms. The flow meter body 10 has a body connector 11 at each end, and the outer wall of the body connector 11 forms a convex spherical sealing surface 12, the center of which is located on the axis of the body connector 11. Each floating connector 20 corresponds to one body connector 11, and the inner wall of the floating connector 20 forms a concave spherical sealing surface 21. The concave spherical sealing surface 21 and the convex spherical sealing surface 12 have the same center of gravity and radius of curvature, and the two fit together to form a spherical sealing pair. Each elastic pre-tightening mechanism corresponds to a set of body connectors 11 and floating connectors 20. The elastic pre-tightening mechanism is used to apply an axial pre-tightening force towards the body connector 11 to the floating connector 20 to maintain the sealing performance of the spherical sealing pair.

[0035] During installation, the floating connector 20 is first connected to the upstream and downstream pipelines via flanges. When there is angular deviation or radial misalignment in the external pipelines, the floating connector 20 and the main connector 11 form a spherical sealing pair through the concave spherical sealing surface 21 and the convex spherical sealing surface 12, which have the same center of gravity and radius of curvature. The floating connector 20 can automatically fine-tune its posture around the center of gravity, ensuring that the spherical sealing pair always remains in contact, thus achieving automatic compensation for installation deviations. Simultaneously, the elastic pre-tightening mechanism applies a constant axial pre-tightening force towards the main connector 11 to the floating connector 20, ensuring that the spherical sealing pair maintains a reliable fit during posture fine-tuning, preserving sealing performance and preventing fluid leakage. During the operation of the flowmeter, the vibrating tube will not experience additional mechanical stress due to pipeline installation deviations, maintaining its inherent equilibrium state and vibration frequency, thus ensuring metering accuracy.

[0036] This embodiment discloses a mass flow meter resistant to installation deviation. By designing a floating pipe 20 and an elastic pre-tightening mechanism at the inlet and outlet ends of the flow meter body 10, when there is an angular deviation or slight radial misalignment in the external pipeline, the floating pipe 20 can freely adjust its attitude around the center of the spherical sealing pair. This achieves automatic compensation for the angular deviation and slight radial misalignment of the pipeline during installation, avoiding the transmission of mechanical stress caused by the deviation to the vibrating tube of the flow meter body 10. This fundamentally solves the metering accuracy problems such as zero drift and measurement anomalies, and significantly improves the long-term metering stability and reliability of the flow meter.

[0037] Meanwhile, the axial preload applied by the elastic preload mechanism ensures that the spherical sealing pair remains tightly fitted, achieving a stable and reliable sealing effect while guaranteeing anti-deviation function and preventing fluid leakage. Because the vibrating tube is free from additional mechanical stress, it maintains its inherent vibration frequency and symmetrical structure, effectively avoiding problems such as zero-point drift and abnormal density measurement, significantly improving the long-term metering accuracy and stability of the flow meter.

[0038] In one embodiment, the elastic pre-tightening mechanism includes a pre-tightening flange 30, a body connecting flange 40, a floating connecting ring 50, eight fixing components 60, and six pre-tightening components 70. The pre-tightening flange 30 has an annular structure and is coaxially fixed to the outer wall of the floating connector 20. The body connecting flange 40 has an annular structure and is coaxially fixed to the outer wall of the body connector 11. The floating connecting ring 50 is disposed around the outer periphery of the floating connector 20.

[0039] Eight fixing components 60 are used to connect the floating connecting ring 50 to the main body connecting flange 40, ensuring that the axes of the floating connecting ring 50 and the main body connecting flange 40 coincide. The eight fixing components 60 are arranged in a circular array along the axis of the main body connecting flange 40. Each fixing component 60 includes a first connecting seat, a second connecting seat, a fixing bolt, and a nut. The first connecting seat is fixedly installed on the outer wall of the main body connecting flange 40, the second connecting seat is fixedly installed on the outer wall of the floating connecting ring 50, and the fixing bolt passes through the first and second connecting seats and engages with the nut. Six pre-tightening components 70 are used to apply an axial pre-tightening force toward the main body connecting pipe 11 to the pre-tightening force-bearing flange 30 after the floating connecting ring 50 is fixedly connected to the main body connecting flange 40.

[0040] The cooperation between the main body connecting flange 40 and the floating connecting ring 50 provides a stable installation foundation for the elastic pre-tightening mechanism, ensuring that the pre-tightening force can be accurately transmitted axially to the floating pipe 20, avoiding uneven force distribution and seal failure caused by off-center loading. The floating connecting ring 50 is connected to the main body connecting flange 40 through multiple ring-shaped array of fixing components 60, resulting in uniform force distribution and improved overall structural stability.

[0041] The six pre-tightening components 70 work together to apply a uniform and stable axial pre-tightening force to the pre-tightening flange 30. Compared with a single pre-tightening structure, this further improves the stability of the pre-tightening force and ensures that the spherical sealing pair maintains a reliable fit during long-term use.

[0042] In one embodiment, the pretensioning assembly 70 includes a guide post 71, a disc spring assembly 72, a loading block 73, and an adjusting bolt 74. The guide post 71 is fixedly disposed on the side of the pretensioning flange 30 opposite to the main body connecting flange 40, and the axis of the guide post 71 is parallel to the axis of the floating connector 20. The disc spring assembly 72 passes through the guide post 71. The loading block 73 abuts against the disc spring assembly 72, and the adjusting bolt 74 is threaded onto the floating connecting ring 50 and fixedly connected to the loading block 73. Specifically, six support arms 51 are fixedly mounted on the floating connecting ring 50, and the support arms 51 extend in the axial direction of the floating connecting ring 50, with each adjusting bolt 74 threaded onto the corresponding support arm 51.

[0043] The guide post 71 ensures that the extension and retraction of the disc spring assembly 72 always proceeds parallel to the axis of the floating pipe 20, preventing the disc spring assembly 72 from shifting during force application and ensuring the axial transmission accuracy of the preload. The disc spring assembly 72 possesses excellent elastic buffering performance, providing not only stable preload but also absorbing minor impacts during installation and vibrations during pipeline operation, reducing the impact of vibrations on the spherical sealing pair and the flow meter body 10. During adjustment, rotating the adjusting bolt 74 pushes the loading block 73 to compress the disc spring assembly 72, achieving precise adjustment of the preload and adapting to sealing requirements under different operating conditions, making operation convenient.

[0044] In one embodiment, the loading block 73 has a relief groove 731 for accommodating the guide post 71, the inner diameter of the relief groove 731 being larger than the outer diameter of the guide post 71. This structural design provides ample room for fine-tuning the attitude of the floating nozzle 20, avoiding interference between the guide post 71 and the loading block 73. When the floating nozzle 20 is finely adjusted around the center of the sphere, the guide post 71 will shift slightly synchronously with the pre-tightened flange 30. Since the inner diameter of the relief groove 731 is larger than the outer diameter of the guide post 71, the guide post 71 can move freely within the relief groove 731 without colliding or rubbing against the loading block 73, ensuring the smoothness of the attitude adjustment of the floating nozzle 20.

[0045] At the same time, this structure ensures that the guide post 71 guides the disc spring assembly 72 without restricting the compensating movement of the floating pipe 20, so that the guiding function of the pre-tightening assembly 70 and the anti-deviation function of the floating pipe 20 are perfectly compatible, further improving the overall reliability of the device.

[0046] In one embodiment, the end face of the main body connecting flange 40 facing the floating connecting ring 50 is provided with four positioning holes 41, which are arranged in a circular array along the axis of the main body connecting flange 40. The end face of the floating connecting ring 50 facing the main body connecting flange 40 is provided with four positioning pins 52, each of which can be inserted into a corresponding positioning hole 41. The cooperation between the positioning pins 52 and the positioning holes 41 enables rapid coaxial positioning of the main body connecting flange 40 and the floating connecting ring 50. No complex calibration process is required during assembly, ensuring that their axes coincide and improving assembly efficiency. Simultaneously, the circular array of positioning pins 52 and positioning holes 41 effectively limits the radial displacement of the floating connecting ring 50 during equipment operation, preventing coaxiality misalignment due to fluid impact or vibration, ensuring uniform distribution of preload and normal operation of the spherical sealing pair.

[0047] In one embodiment, the inner diameter of the floating connecting ring 50 is larger than the outer diameter of the pre-tightening flange 30. When the floating pipe 20 deflects due to pipe deviation, the outer periphery of the pre-tightening flange 30 will form a limiting fit with the inner wall of the floating connecting ring 50, preventing the pre-tightening flange 30 and the floating pipe 20 from deflecting excessively. This prevents the spherical sealing pair from falling out of the contact range due to excessive deflection angle, which could lead to sealing failure or accelerated spherical wear, thus ensuring the long-term reliability of the spherical sealing pair.

[0048] In addition, while limiting excessive deflection, sufficient radial movement space is reserved for the pre-tightened force flange 30 to make fine adjustments to the normal posture of the floating pipe 20. This ensures that the compensation effect of installation deviation is not affected by the limiting structure, and that the components are not damaged due to excessive movement through reasonable limiting protection, thus achieving a balance between the flexibility of posture adjustment and the safety of the structure.

[0049] In one embodiment, the convex spherical sealing surface 12 is provided with two grooves 13, which extend circumferentially along the main body connector 11, and each groove 13 is provided with a sealing ring 80. The two annular grooves 13, together with the sealing rings 80, form a multi-seal structure. The sealing rings 80 fill the tiny gaps between the sealing surfaces through elastic deformation, which not only enhances the sealing reliability but also acts as a buffer, reducing direct friction between the spherical sealing surfaces and extending the service life of the spherical sealing pair.

[0050] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A mass flow meter resistant to installation deviation, characterized in that, include: The flow meter body (10) has a body connector (11) at each end. The outer wall of the body connector (11) is formed with an outwardly convex spherical sealing surface (12), and the center of the outwardly convex spherical sealing surface (12) is located on the axis of the body connector (11). Two floating nozzles (20), each of which corresponds to one of the main nozzles (11), the inner wall of each floating nozzle (20) has a concave spherical sealing surface (21), the concave spherical sealing surface (21) and the convex spherical sealing surface (12) have the same center of curvature and radius of curvature, and the two fit together to form a spherical sealing pair; and Two elastic pre-tightening mechanisms are provided, each corresponding to a set of the main body pipe (11) and the floating pipe (20). The elastic pre-tightening mechanism is used to apply an axial pre-tightening force toward the main body pipe (11) to the floating pipe (20) to maintain the sealing performance of the spherical sealing pair.

2. The mass flow meter resistant to installation deviation according to claim 1, characterized in that, The elastic preload mechanism includes: The pre-tightening flange (30) has a ring-shaped structure and is coaxially fixed to the outer wall of the floating pipe (20); The body connecting flange (40) has a ring-shaped structure and is coaxially fixed to the outer wall of the body connecting pipe (11); A floating connecting ring (50) is disposed around the outer periphery of the floating connecting pipe (20); Multiple fixing components (60) are used to connect the floating connecting ring (50) to the body connecting flange (40), and to make the axes of the floating connecting ring (50) and the body connecting flange (40) coincide. The multiple fixing components (60) are arranged in a ring array along the axis of the body connecting flange (40); and Multiple pre-tightening components (70) are used to apply an axial pre-tightening force toward the body connecting flange (11) to the pre-tightening force-bearing flange (30) after the floating connecting ring (50) is connected to the body connecting flange (40).

3. The mass flow meter resistant to installation deviation according to claim 2, characterized in that, The preload assembly (70) includes a guide post (71), a disc spring assembly (72), a loading block (73), and an adjusting bolt (74). The guide post (71) is located on the side of the pre-tightening flange (30) away from the main body connecting flange (40), and the axis of the guide post (71) is parallel to the axis of the floating pipe (20); the disc spring assembly (72) passes through the guide post (71); the loading block (73) abuts against the disc spring assembly (72), and the adjusting bolt (74) is threaded onto the floating connecting ring (50) and connected to the loading block (73).

4. The mass flow meter resistant to installation deviation according to claim 3, characterized in that, The loading block (73) has a relief groove (731) for accommodating the guide post (71), the inner diameter of the relief groove (731) being larger than the outer diameter of the guide post (71).

5. The mass flow meter resistant to installation deviation according to claim 2, characterized in that, The end face of the main body connecting flange (40) facing the floating connecting ring (50) is provided with a plurality of positioning holes (41), and the plurality of positioning holes (41) are arranged in a ring array along the axis of the main body connecting flange (40). The floating connecting ring (50) has a plurality of positioning pins (52) on its end face facing the main body connecting flange (40), and each positioning pin (52) can be inserted into the corresponding positioning hole (41).

6. The mass flow meter resistant to installation deviation according to claim 2, characterized in that, The inner diameter of the floating connecting ring (50) is larger than the outer diameter of the pre-tightening flange (30).

7. The mass flow meter resistant to installation deviation according to claim 1, characterized in that, The convex spherical sealing surface (12) is provided with multiple grooves (13), the grooves (13) extend circumferentially along the main body connector (11), and each groove (13) is provided with a sealing ring (80).

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