An insertion-type thermal gas mass flow meter

Abstract

This utility model discloses an insertion-type thermal gas mass flow meter, including a flow meter body and a pipe. A base is welded to the upper end of the pipe. The outer walls of two fixing plates are both circular and located on the same axis. A fixing mechanism is installed on the outer wall of the first fixing plate, and a limiting mechanism is installed on the outer wall of the pipe. The fixing mechanism is used to fix the first and second fixing plates, and the limiting mechanism is used to limit the fixing mechanism. This utility model, through the sliding fit between the flow probe and the base, and the design of the screw and the arc-shaped groove in the fixing mechanism, allows the operator to flexibly fine-tune the angle of the flow meter body during installation. Even if the base undergoes thermal deformation due to welding, the flow meter body can be rotated to allow the screw to slide along the groove, quickly calibrating the perpendicularity of the flow probe to the pipe axis, effectively avoiding inaccurate measurement data caused by installation angle deviation.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, specifically to an insertion-type thermal gas mass flow meter. Background Technology

[0002] Thermal flow meters are direct mass flow meters based on the principle of convective heat transfer through heating sensing elements. They are mainly used for measuring the mass flow rate of gases.

[0003] In existing technologies, when monitoring the gas quality in pipelines, most methods involve opening a through hole on the outside of the pipeline and welding a connecting seat. The flow meter is then installed on the outer wall of the connecting seat, allowing its sensor to penetrate into the pipeline to monitor the gas quality. However, in actual use, the flow meter and the connecting seat are mostly connected by a flange. During the welding process, the high temperature causes thermal deformation of the connecting seat, resulting in a deviation between the perpendicular angle of the flow meter's mounting surface and the pipeline axis, which in turn affects subsequent monitoring data. Therefore, this invention proposes an insertion-type thermal gas mass flow meter to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies where welding heat deformation of the connector causes flow meter installation angle deviation and measurement inaccuracy, a sliding flow probe, a fixed mechanism with a sliding groove, and an elastic limiting mechanism are incorporated to achieve flexible adjustment and stable locking of the installation angle. This avoids affecting measurement accuracy due to angle deviation and ensures accurate and reliable gas quality monitoring data.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: It includes a flow meter body and a pipe. A base is welded to the upper end of the pipe, and a flow probe is provided at the lower end of the flow meter body. The flow probe slides inside the base and extends into the pipe. A fixing plate one is fixedly connected to the outer wall of the flow meter body, and a fixing plate two is fixedly connected to the outer wall of the base. The outer walls of both fixing plate one and fixing plate two are circular and located on the same axis. A fixing mechanism is installed on the outer wall of fixing plate one, and a limiting mechanism is installed on the outer wall of the pipe.

[0008] The fixing mechanism is used to fix the first fixing plate and the second fixing plate;

[0009] The limiting mechanism is used to limit the movement of the fixed mechanism;

[0010] Preferably, the fixing mechanism includes multiple sets of screws threaded to the outer wall of the fixing plate, a sliding groove is provided through the outer wall of the fixing plate, the inner wall of the sliding groove is arc-shaped, the outer wall of the screw is in close contact with the inner wall of the sliding groove, a fixing block is fixedly connected to the end of each screw, multiple sets of through holes are provided at the opening of the sliding groove, and the positions correspond one-to-one with the positions of the multiple sets of screws, the diameter of the multiple sets of through holes is the same as the diameter of the fixing block and is larger than the diameter of the screw, and the end face of the fixing block is in contact with the bottom surface of the fixing plate.

[0011] Preferably, the limiting mechanism includes two sets of side plates fixedly connected to the end face of the pipe. Each set of side plates has a sliding rod slidably connected to its outer wall, and a limiting plate is fixedly connected to the end of the sliding rod. The inner and outer walls of the limiting plate are both arc-shaped. Each set of fixed blocks has a limiting groove on its outer wall, and the outer wall of the limiting groove is cylindrical. The limiting plate is engaged in the limiting groove.

[0012] Preferably, a limiting block is fixedly connected to the end of each set of slide rods away from the limiting plate, and the radius of the limiting block is larger than the radius of the slide rod.

[0013] Preferably, each set of slide rods is fitted with a spring on its outer wall, one end of the spring is fixedly connected to the side plate, and the other end of the spring is fixedly connected to the limiting block.

[0014] Preferably, a sealing gasket is provided on the lower end face of the fixing plate.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides an insertion-type thermal gas mass flow meter, which has the following advantages:

[0017] 1. Through the sliding fit between the flow probe and the base, as well as the design of the screw and the arc-shaped groove in the fixing mechanism, the operator can flexibly fine-tune the angle of the flow meter body during installation. Even if the base is deformed by heat due to welding, the flow meter body can be rotated to make the screw slide along the groove, quickly calibrating the perpendicularity of the flow probe to the pipeline axis, effectively avoiding the problem of inaccurate measurement data caused by installation angle deviation.

[0018] 2. The elastic preload provided by the spring can restrict the movement of the fixing block in all directions. When the residual stress of the base welding is released or the pipeline vibrates, the limiting plate is always tightly locked in the limiting groove to prevent the screws and fixing blocks in the fixing mechanism from shifting. At the same time, the sealing gasket fills the gap between fixing plate one and fixing plate two, which not only ensures the long-term stability of the flow meter installation angle, but also avoids gas leakage and ensures that the gas quality monitoring data is true and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an insertion-type thermal gas mass flow meter proposed in this utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the medium flow meter body;

[0021] Figure 3 for Figure 2 Schematic diagram of components such as fixing plate one and fixing plate two;

[0022] Figure 4 for Figure 3 Schematic diagram of the structure of the middle fixed plate and the base;

[0023] In the diagram: 1. Flow meter body; 2. Pipe; 3. Base; 4. Flow probe; 5. Side plate; 6. Slide groove; 7. Through hole; 8. Limiting plate; 9. Slide rod; 10. Limiting block; 11. Spring; 12. Screw; 13. Fixing block; 14. Limiting groove; 15. Fixing plate one; 16. Fixing plate two. Detailed Implementation

[0024] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0025] This utility model provides a technical solution for an insertion-type thermal gas mass flow meter:

[0026] Please see Figure 1-4 An insertion-type thermal gas mass flow meter includes a flow meter body 1 and a pipe 2. A base 3 is welded to the upper end of the pipe 2. A flow probe 4 is provided at the lower end of the flow meter body 1. The flow probe 4 slides inside the base 3 and extends into the pipe 2. A fixing plate 15 is fixedly connected to the outer wall of the flow meter body 1. A fixing plate 16 is fixedly connected to the outer wall of the base 3. The outer walls of the fixing plate 15 and the fixing plate 16 are both circular and located on the same axis. A fixing mechanism is installed on the outer wall of the fixing plate 15. A limit mechanism is installed on the outer wall of the pipe 2.

[0027] The fixing mechanism is used to fix the fixing plate 15 and the fixing plate 2 16;

[0028] Limiting mechanisms are used to limit the movement of fixed mechanisms;

[0029] The fixing mechanism includes multiple sets of screws 12 threaded to the outer wall of the fixing plate 15. A sliding groove 6 is provided through the outer wall of the fixing plate 16. The inner wall of the sliding groove 6 is arc-shaped. The outer wall of the screws 12 is in close contact with the inner wall of the sliding groove 6. Each end of the screws 12 is fixedly connected to a fixing block 13. Multiple sets of through holes 7 are provided at the opening of the sliding groove 6, and their positions correspond one-to-one with the positions of the multiple sets of screws 12. The diameter of the multiple sets of through holes 7 is the same as the diameter of the fixing block 13, and is larger than the diameter of the screws 12. The end face of the fixing block 13 is in contact with the bottom surface of the fixing plate 16.

[0030] Furthermore, when adjusting the perpendicular angle between the flow meter body 1 and the axis of the pipe 2, the flow meter body 1 is rotated as a whole, which simultaneously drives the outer wall of the screw 12 to slide in the slide groove 6. After the adjustment is completed, the screw 12 is reversed to drive the end face of the fixing block 13 to be tightly connected with the bottom surface of the fixing plate 16, thereby fixing the flow meter body 1 as a whole. The through hole 7 provides a channel for the fixing block 13 to slide in and out.

[0031] The limiting mechanism includes two sets of side plates 5 fixedly connected to the end face of the pipe 2. Each set of side plates 5 has a sliding rod 9 slidably connected to its outer wall, and a limiting plate 8 is fixedly connected to the end of the sliding rod 9. The inner and outer walls of the limiting plate 8 are arc-shaped. Each set of fixing blocks 13 has a limiting groove 14 on its outer wall, and the outer wall of the limiting groove 14 is cylindrical. The limiting plate 8 is locked in the limiting groove 14.

[0032] Furthermore, the cooperation between the limiting plate 8 and the limiting groove 14 can effectively prevent the screw 12 and the fixing block 13 in the fixing mechanism from shifting due to factors such as the release of residual welding stress of the base 3 and vibration of the pipeline 2, thereby avoiding angular deviation of the flow meter body 1; the arc-shaped limiting plate 8 and the cylindrical limiting groove 14 fit tightly together, which can restrict the movement of the fixing block 13 in all directions, further ensuring the perpendicularity of the flow probe 4 to the axis of the pipeline 2, and ensuring the accuracy of gas quality monitoring data.

[0033] Each set of slide rods 9 is fixedly connected to a limit block 10 at the end away from the limit plate 8. The radius of the limit block 10 is larger than the radius of the slide rod 9.

[0034] Furthermore, the limiting block 10 can prevent the slide bar 9 from accidentally coming off the side plate 5, ensuring that the limiting plate 8 always maintains a limiting relationship with the fixing block 13.

[0035] Each set of slide rods 9 is fitted with a spring 11 on its outer wall. One end of the spring 11 is fixedly connected to the side plate 5, and the other end of the spring 11 is fixedly connected to the limit block 10. A sealing gasket is provided on the lower end face of the fixing plate 15.

[0036] Furthermore, the elastic preload provided by the spring 11 ensures that the limiting plate 8 is always tightly engaged in the limiting groove 14, so that even if the pipeline 2 vibrates during long-term operation, the limiting effect can be guaranteed to be stable. The sealing gasket can fill the tiny gap between the fixing plate 15 and the fixing plate 26 to prevent gas leakage in the pipeline 2.

[0037] In practical use, the working principle of this utility model is as follows:

[0038] When installing this insertion-type thermal gas mass flow meter, first weld the base 3 to the upper end of the pipe 2, then install the flow meter body 1, aligning it with the base 3 so that the fixing plate 15 and the fixing plate 16 are on the same axis. If an angular deviation is found between the flow probe 4 and the axis of the pipe 2, the operator can rotate the entire flow meter body 1. At this time, the screw 12 in the fixing mechanism will slide along the arc-shaped groove 6 on the fixing plate 16, thereby fine-tuning the angle of the flow probe 4. After adjusting the flow probe 4 to be perpendicular to the axis of the pipe 2, reverse the screw 12 to make the end face of the fixing block 13 fit tightly against the bottom surface of the fixing plate 16, completing the initial fixing of the flow meter body 1.

[0039] After initial fixation, the operator pulls the slide bar 9 to overcome the elastic force of the spring 11, aligning the limiting plate 8 with the limiting groove 14 on the fixing block 13. After releasing the slide bar 9, the elastic preload provided by the spring 11 drives the limiting plate 8 into the limiting groove 14. The arc-shaped and cylindrical fit design of the limiting plate 8 and the limiting groove 14 comprehensively restricts the movement of the fixing block 13, effectively preventing the screw 12 and the fixing block 13 from shifting due to residual stress release from the welding of the base 3, vibration of the pipeline 2, etc., thereby avoiding angular deviation of the flow meter body 1. At the same time, the limiting block 10 prevents the slide bar 9 from accidentally detaching from the side plate 5, ensuring that the limiting plate 8 always maintains a limiting relationship with the fixing block 13.

[0040] After installation, the flow meter begins operation. The flow probe 4 extends into the pipe 2, using a thermal principle to monitor gas quality. Due to its accurate installation angle, the flow probe 4 can stably and accurately sense the gas flow state and obtain precise measurement data. The sealing gasket on the lower end face of the fixing plate 15 fills the tiny gap between the fixing plate 15 and the fixing plate 16, preventing gas leakage in the pipe 2 and ensuring the authenticity and reliability of the measurement data. During long-term operation, even if the pipe 2 vibrates, the stable elastic preload provided by the spring 11 ensures that the limiting plate 8 remains tightly engaged in the limiting groove 14, continuously maintaining the stability of the flow meter body 1's installation angle and ensuring stable and accurate gas quality monitoring.

[0041] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. An insertion-type thermal gas mass flow meter, comprising a flow meter body (1) and a pipe (2), characterized in that: The upper end of the pipe (2) is welded with a base (3), and the lower end of the flow meter body (1) is provided with a flow probe (4). The flow probe (4) slides inside the base (3) and extends into the pipe (2). The outer wall of the flow meter body (1) is fixedly connected with a fixing plate one (15), and the outer wall of the base (3) is fixedly connected with a fixing plate two (16). The outer walls of the fixing plate one (15) and the fixing plate two (16) are both circular and on the same axis. The outer wall of the fixing plate one (15) is equipped with a fixing mechanism, and the outer wall of the pipe (2) is equipped with a limit mechanism. The fixing mechanism is used to fix the first fixing plate (15) and the second fixing plate (16); The limiting mechanism is used to limit the movement of the fixed mechanism.

2. The insertion-type thermal gas mass flow meter according to claim 1, characterized in that: The fixing mechanism includes multiple sets of screws (12) threaded to the outer wall of the fixing plate one (15). The outer wall of the fixing plate two (16) is provided with a sliding groove (6). The inner wall of the sliding groove (6) is arc-shaped. The outer wall of the screw (12) is in close contact with the inner wall of the sliding groove (6). The ends of the screws (12) are fixedly connected to fixing blocks (13). Multiple sets of through holes (7) are opened at the groove opening of the sliding groove (6), and their positions correspond one-to-one with the positions of the multiple sets of screws (12). The diameter of the multiple sets of through holes (7) is the same as the diameter of the fixing block (13) and is larger than the diameter of the screw (12). The end face of the fixing block (13) is in contact with the bottom surface of the fixing plate two (16).

3. The insertion-type thermal gas mass flow meter according to claim 2, characterized in that: The limiting mechanism includes two sets of side plates (5) fixedly connected to the end face of the pipe (2). Each set of side plates (5) has a sliding rod (9) slidably connected to its outer wall, and a limiting plate (8) is fixedly connected to the end of the sliding rod (9). The inner and outer walls of the limiting plate (8) are arc-shaped. Each set of fixed blocks (13) has a limiting groove (14) on its outer wall, and the outer wall of the limiting groove (14) is cylindrical. The limiting plate (8) is locked in the limiting groove (14).

4. The insertion-type thermal gas mass flow meter according to claim 3, characterized in that: Each set of slide rods (9) is fixedly connected to a limiting block (10) at the end away from the limiting plate (8), and the radius of the limiting block (10) is larger than the radius of the slide rod (9).

5. An insertion-type thermal gas mass flow meter according to claim 4, characterized in that: Each set of slide rods (9) is fitted with a spring (11) on its outer wall. One end of the spring (11) is fixedly connected to the side plate (5), and the other end of the spring (11) is fixedly connected to the limiting block (10).

6. The insertion-type thermal gas mass flow meter according to claim 5, characterized in that: A sealing gasket is provided on the lower end face of the fixing plate (15).

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