Gas flowmeter

Abstract

The utility model provides a gas flow meter, which relates to the technical field of gas flow detection, and comprises a cavity, two ends of the cavity are respectively provided with a first communication port and a second communication port, and the top of the cavity is provided with a sampling port; the rectifying mechanism is arranged in the cavity and is used for rectifying gas in the cavity; the detection mechanism is arranged at the sampling port, and the detection mechanism is used for detecting after rectification of the rectification mechanism. According to the utility model, to-be-detected gas is introduced into the cavity, the first communication port and the second communication port at the two ends are respectively connected with the to-be-detected pipeline and are connected through the flange, and the sampling port at the top of the cavity sends the gas taken out from the cavity to the detection mechanism for detection; before detection, gas is rectified through the rectifying mechanism arranged in the cavity, a disordered flow state is converted into a stable flow state with uniform speed and small fluctuation, and interference of a flow field on sensor detection is reduced from the source.

Description

Technical Field

[0001] This utility model relates to the field of gas flow detection technology, specifically to a gas flow meter. Background Technology

[0002] Gas flow measurement is a key technology in industrial automation, environmental protection, and public services. Currently, mainstream gas flow measurement methods include differential pressure, vortex, turbine, and ultrasonic methods, with differential pressure flow meters being widely used due to their simple structure and controllable cost. However, traditional differential pressure flow meters rely on the difference between the dynamic and static pressure of the fluid to calculate flow rate. But the gas flow pattern within the pipeline is easily affected by upstream bends, valves, reducers, and other pipe fittings, leading to uneven velocity distribution, eddies, or pressure fluctuations. For example, Chinese patent (publication number CN222544755U) discloses a gas flow meter that also detects gas pressure. Although it uses a dust filter assembly to allow gas in the pipeline to pass through a first shut-off valve into a dust filter tube under pressure, and the gas in the dust filter tube then passes through a dust filter screen and enters the guide pipe from its output end under pressure, effectively improving the detection accuracy of the device, it is still susceptible to measurement errors due to flow field instability caused by its internal structure. Therefore, this utility model proposes a gas flow meter to improve the above-mentioned problems. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defect of measurement error caused by the instability of the gas flow field in the prior art, thereby providing a gas flow meter.

[0004] To solve the above problems, this utility model provides a gas flow meter, which includes:

[0005] A cavity, wherein a first connecting port and a second connecting port are respectively provided at both ends of the cavity, and a sampling port is provided at the top of the cavity;

[0006] A rectifier mechanism is disposed within the cavity to rectify the gas within the cavity;

[0007] The testing mechanism is located at the sampling port and performs testing on the rectified sample after it has passed through the rectifier.

[0008] Preferably, the rectification mechanism includes: a partition plate and a flow divider plate, wherein at least two partition plates and flow divider plates are evenly spaced apart along the height direction of the cavity, the two sides of the partition plate and the flow divider plate respectively abut against the two inner sides of the cavity, and the two ends of the partition plate and the flow divider plate are respectively spaced apart from the first communication port and the second communication port.

[0009] Preferably, the partition piece is provided with an extension at each of its four ends, the extensions extending toward and abutting against the two inner end faces of the cavity, and a snap-fit ​​part is provided in the cavity corresponding to each of the four extensions, and the partition piece is slidably connected through the extensions and the snap-fit ​​parts;

[0010] The snap-fit ​​portion has pads evenly arranged along the height direction, and the extension portion abuts against the corresponding pads.

[0011] Preferably, the flow divider is provided with a plurality of elongated holes evenly distributed on it;

[0012] The two inner sidewalls of the cavity are provided with locking blocks along their height direction corresponding to the flow divider. Each flow divider has one locking block on each side, and the two ends of the flow divider abut against the locking part.

[0013] Preferably, the two inner sidewalls of the cavity are respectively provided with assembly grooves corresponding to the card block, and a movable groove is provided on the side of the assembly groove facing away from the cavity and facing outward from the cavity. A sliding groove is provided on the side of the movable groove facing away from the assembly groove and facing outward from the cavity.

[0014] The card block is connected to a movable rod on the side facing away from the cavity. The movable rod extends into the assembly groove, the movable groove, and the sliding groove. The movable rod and the sliding groove are slidably connected.

[0015] Preferably, a spring is fitted onto the movable rod, and the two ends of the spring abut against the locking block and the movable groove, respectively.

[0016] Preferably, the detection mechanism includes: a sampling block, wherein the edge of the sampling port is provided with an alignment groove adapted to the sampling block, and the sampling block and the alignment groove are connected;

[0017] A collection hole is provided at the bottom center of the sampling block, and an exhaust hole is provided at the top of the sampling block. One end of the exhaust hole is connected to the collection hole, and the other end passes through the top of the sampling block.

[0018] A float is provided inside the collection hole, and a gap is provided between the float and the collection hole;

[0019] A collection rod is installed inside the exhaust port, and a pressure sensor is installed at one end of the collection rod near the collection tank.

[0020] Preferably, both the collection hole and the float are in the shape of an inverted frustum.

[0021] A collection groove is also provided at one end of the collection hole near the cavity. The collection hole and the collection groove are connected. The shape of the collection groove is a frustum of a circle.

[0022] Preferably, a plurality of connecting rods are provided between the vent and the collecting rod.

[0023] Preferably, a protective tube is provided at one end of the collection hole near the top of the float, and a protective cover is provided at the end of the protective tube away from the float.

[0024] The gas flow meter provided by this utility model has the following beneficial effects:

[0025] 1. This utility model introduces the gas to be tested into the cavity. The first and second connecting ports at both ends are connected to the pipeline to be tested and connected by flanges. The sampling port at the top of the cavity sends the gas taken out from the cavity to the testing mechanism for testing. Before testing, the gas is rectified by the rectifier mechanism set in the cavity to convert the turbulent flow state into a stable flow state with uniform velocity and small fluctuations, thereby reducing the interference of the flow field on the sensor detection from the source.

[0026] 2. The present invention also promotes the flow of gas through the structure formed by the partition plate, the flow divider plate and the inner side wall of the cavity, so that the gas can only pass through the gap between the partition plate and the flow divider plate and the gap with the first communication port and the second communication port, thereby limiting the flow path of the gas. By utilizing the layered layout of the partition plate and the flow divider plate, the gas can be effectively rectified, the gas flow field can be stabilized, and the eddies and uneven flow velocity can be reduced.

[0027] 3. This utility model also utilizes the fact that when the gas in the cavity is rectified and enters the collection hole, the float in the collection hole is displaced according to the gas flow rate and moves closer to the pressure sensor of the collection rod. The pressure sensor is commercially available and is used to detect changes in gas pressure. The pressure sensor will detect the dynamic pressure changes in the exhaust hole in real time, thereby obtaining the gas flow rate. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the assembly of this utility model;

[0029] Figure 2 This is a schematic diagram of the installation of the protective cover structure of this utility model;

[0030] Figure 3 This is a schematic diagram of the installation of the flow divider structure of this utility model;

[0031] Figure 4 This is a schematic diagram of the partition plate structure installation of this utility model;

[0032] Figure 5 This is a schematic diagram of the installation of the extension structure of this utility model;

[0033] Figure 6 This is a schematic diagram of the installation of the collection hole structure of this utility model.

[0034] The reference numerals in the attached figures are as follows:

[0035] 1. Cavity; 2. First connecting port; 3. Second connecting port; 4. Sampling port; 5. Partition plate; 6. Diverter plate; 7. Extension; 8. Snap-fit ​​part; 9. Long strip hole; 10. Locking block; 11. Assembly groove; 12. Movable groove; 13. Slide groove; 14. Movable rod; 15. Spring; 16. Sampling block; 17. Alignment groove; 18. Collection hole; 19. Exhaust hole; 20. Float; 21. Acquisition rod; 22. Pressure sensor; 23. Collection groove; 24. Connecting rod; 25. Protective tube; 26. Protective cover. Detailed Implementation

[0036] like Figure 1-6 As shown, this utility model provides a gas flow meter, which includes:

[0037] A cavity 1 has a first connecting port 2 and a second connecting port 3 at its two ends, and a sampling port 4 at its top. A rectifier mechanism is located inside the cavity 1 to rectify the gas within it. A detection mechanism is located at the sampling port 4 and performs detection on the gas after rectification by the rectifier mechanism. Figure 1-6 As shown, a gas flow meter has a cavity 1 for introducing the gas to be detected. The first connecting port 2 and the second connecting port 3 at both ends are connected to the pipeline to be detected and are connected by flanges. The sampling port 4 at the top of the cavity 1 sends the gas taken from the cavity 1 to the detection mechanism for detection. Before detection, the gas is rectified by the rectifier mechanism set in the cavity 1 to convert the turbulent flow state into a stable flow state with uniform velocity and small fluctuations, thereby reducing the interference of the flow field on the sensor detection from the source.

[0038] In some embodiments, the rectifying mechanism includes: a partition plate 5 and a diverter plate 6, wherein at least two partition plates 5 and diverter plates 6 are evenly spaced along the height direction of the cavity 1, and the two sides of the partition plate 5 and the diverter plate 6 respectively abut against the two inner sides of the cavity 1, and the two ends of the partition plate 5 and the diverter plate 6 are respectively spaced apart from the first connecting port 2 and the second connecting port 3. Figure 1-6 As shown, the partition plate 5 and the flow divider plate 6 are arranged evenly and sequentially along the height direction of the cavity 1. The structure formed by the partition plate 5, the flow divider plate 6 and the inner wall of the cavity 1 can promote the gas to pass only through the gap between the partition plate 5 and the flow divider plate 6 and the gap with the first connecting port 2 and the second connecting port 3, thereby limiting the flow path of the gas. By utilizing the layered layout of the partition plate 5 and the flow divider plate 6, the gas can be effectively rectified, the gas flow field can be stabilized, and eddies and uneven flow velocity can be reduced.

[0039] In some embodiments, extensions 7 are provided at the four ends of the partition piece 5, and the extensions 7 extend toward and abut against the two inner end faces of the cavity 1. A locking part 8 is provided inside the cavity 1 corresponding to each of the four extensions 7, and the partition piece 5 is slidably connected through the extensions 7 and the locking parts 8. A pad is uniformly provided along the height direction inside the locking part 8, and the extensions 7 abut against the corresponding pads. Figure 1-6 As shown, the extension 7 and the snap-fit ​​part 8 snap together, so that the two ends of the partition piece 5 and the cavity 1 can maintain a stable connection. The pad material of the snap-fit ​​part 8 can be rubber, which promotes the friction effect between the extension 7 and the snap-fit ​​part 8 and improves the stable connection of the partition piece 5.

[0040] In some embodiments, the flow divider 6 is provided with a plurality of elongated holes 9 evenly distributed; the two inner sidewalls of the cavity 1 are provided with locking blocks 10 along their height direction corresponding to the flow divider 6, and one locking block 10 is provided on each side of each flow divider 6, with the two ends of the flow divider 6 respectively abutting against the locking part 8. Figure 1-6 As shown, the elongated hole 9 allows for further gas diversion, making the gas flow velocity more uniform when passing through the diverter 6. The clamping block 10 keeps the diverter 6 stable on the inner wall of the cavity 1.

[0041] In some embodiments, the two inner sidewalls of the cavity 1 are respectively provided with assembly grooves 11 corresponding to the locking block 10. A movable groove 12 is provided on the side of the assembly groove 11 facing away from the cavity 1 and extending outward from the cavity 1. A sliding groove 13 is provided on the movable groove 12 facing away from the assembly groove 11 and extending outward from the cavity 1. A movable rod 14 is connected to the side of the locking block 10 facing away from the cavity 1, and the movable rod 14 extends into the assembly groove 11, the movable groove 12, and the sliding groove 13. The movable rod 14 and the sliding groove 13 are slidably connected. Figure 1-6 As shown, the locking block 10 and the assembly groove 11 are adapted and slidably connected. In use, the two sides of the flow divider 6 are respectively inserted into the two locking blocks 10 on the two side walls of the cavity 1. The movable rod 14 slides into the assembly groove 11, the movable groove 12 and the sliding groove 13 in sequence. After both sides of the flow divider 6 are rotated into the locking block 10, the sliding rod slides into the cavity 1 to complete the assembly.

[0042] In some embodiments, a spring 15 is fitted onto the movable rod 14, with both ends of the spring 15 abutting against the locking block 10 and the movable groove 12, respectively. For example... Figure 1-6 As shown, the spring 15 is commercially available. The spring 15 is designed so that after assembly, it can recover its deformation through elastic force, promote the return of the locking block 10 to its initial state, and enable the locking block 10 to clamp the diverter plate 6.

[0043] In some embodiments, the detection mechanism includes: a sampling block 16, with an alignment groove 17 adapted to the sampling port 4 at its edge, the sampling block 16 and the alignment groove 17 being connected; a collection hole 18 is provided at the bottom center of the sampling block 16, and an exhaust hole 19 is provided at the top of the sampling block 16, one end of the exhaust hole 19 communicating with the collection hole 18, and the other end penetrating through the top of the sampling block 16; a float 20 is provided inside the collection hole 18, with a gap between the float 20 and the collection hole 18; a collection rod 21 is provided inside the exhaust hole 19, and a pressure sensor 22 is provided at the end of the collection rod 21 near the collection groove 23. Figure 1-6 As shown, the sampling block 16 and the alignment groove 17 are connected to ensure that the sampling block 16 can be accurately installed at the sampling port 4. A sealing ring is set between the sampling block 16 and the alignment groove 17 to promote the sealing effect after the connection. The connection between the sampling block 16 and the sampling port 4 can be by snap-fit ​​or bolt connection. The collection hole 18 and the exhaust hole 19 of the sampling block 16 are connected. When the gas in the cavity 1 is rectified, it enters the collection hole 18. The float 20 in the collection hole 18 is displaced according to the gas flow rate and moves closer to the pressure sensor 22 of the sampling rod 21. The pressure sensor 22 is commercially available and is used to detect the pressure change of the gas. The pressure sensor 22 will detect the dynamic pressure change in the exhaust hole 19 in real time. This pressure value is directly related to the displacement of the float 20 (i.e., the gas flow rate). The resistive element inside the sensor deforms under pressure, resulting in a change in resistance value. This change is converted into a voltage signal through a Wheatstone bridge. The final output electrical signal (voltage or current) of the sensor is linearly related to the pressure, thereby obtaining the gas flow rate.

[0044] In some embodiments, both the collection hole 18 and the float 20 are inverted frustum shapes; a collection groove 23 is also provided at one end of the collection hole 18 near the cavity 1, the collection hole 18 and the collection groove 23 are connected, and the collection groove 23 is in the shape of a perfect frustum. Figure 1-6 As shown, the inverted frustum shape makes the gas flow more smoothly in the collection hole 18, the movement of the float 20 more stable, and the collection groove 23 can guide the flow and expand the collection surface, making the detection smoother.

[0045] In some embodiments, a plurality of connecting rods 24 are provided between the vent 19 and the collecting rod 21. For example... Figure 1-6 As shown, the two ends of the connecting rod 24 are respectively connected between the exhaust port 19 and the collection rod 21. It can be in the form of snap-fit ​​or screw-fit, which serves to maintain the gas exhaust channel.

[0046] In some embodiments, a protective tube 25 is provided at one edge of the collection hole 18 near the top of the float 20, and a protective cap 26 is provided at the end of the protective tube 25 away from the float 20. Figure 1-6 As shown, the protective tube 25 and the protective cover 26 can be connected by screws, and can remain closed when not being tested to prevent gas from escaping. A rubber seal can be provided between the two.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A gas flow meter, characterized in that, include: A cavity (1) is provided with a first connecting port (2) and a second connecting port (3) at both ends of the cavity (1), and a sampling port (4) is provided at the top of the cavity (1). A rectifier mechanism is disposed in the cavity (1) to rectify the gas in the cavity (1); The testing mechanism is located at the sampling port (4) and performs testing on the rectified sample after it has passed through the rectifier.

2. The gas flow meter according to claim 1, characterized in that: The rectification mechanism includes: a partition plate (5) and a flow divider plate (6). At least two partition plates (5) and flow dividers (6) are arranged evenly and sequentially along the height direction of the cavity (1). The two sides of the partition plate (5) and the flow divider plate (6) abut against the two inner sides of the cavity (1). The two ends of the partition plate (5) and the flow divider plate (6) are respectively spaced apart from the first connecting port (2) and the second connecting port (3).

3. The gas flow meter according to claim 2, characterized in that: The partition piece (5) has an extension (7) at each of its four ends. The extension (7) extends toward and abuts against the two inner end faces of the cavity (1). The cavity (1) has a snap-fit ​​part (8) corresponding to each of the four extensions (7). The partition piece (5) is slidably connected through the extension (7) and the snap-fit ​​part (8). The snap-fit ​​portion (8) is provided with pads evenly arranged along the height direction, and the extension portion (7) abuts against the corresponding pads.

4. The gas flow meter according to claim 3, characterized in that: The flow divider (6) is provided with a plurality of elongated holes (9) evenly distributed on it; The two inner walls of the cavity (1) are provided with locking blocks (10) along their height direction corresponding to the flow divider (6). Each flow divider (6) is provided with a locking block (10) on both sides. The two ends of the flow divider (6) respectively abut against the locking part (8).

5. The gas flow meter according to claim 4, characterized in that: The two inner sidewalls of the cavity (1) are respectively provided with assembly grooves (11) corresponding to the card block (10). The side of the assembly groove (11) facing away from the cavity (1) is provided with a movable groove (12) facing outward from the cavity (1). The movable groove (12) is provided with a sliding groove (13) facing away from the assembly groove (11) facing outward from the cavity (1). The locking block (10) has a movable rod (14) connected to the side facing away from the cavity (1). The movable rod (14) extends into the assembly groove (11), the movable groove (12) and the sliding groove (13). The movable rod (14) and the sliding groove (13) are slidably connected.

6. The gas flow meter according to claim 5, characterized in that: A spring (15) is sleeved on the movable rod (14), and the two ends of the spring (15) abut against the locking block (10) and the movable groove (12) respectively.

7. The gas flow meter according to claim 1, characterized in that: The detection mechanism includes: a sampling block (16), and the sampling port (4) has an alignment groove (17) that is adapted to the sampling block (16) on its edge. The sampling block (16) and the alignment groove (17) are connected. The sampling block (16) has a collection hole (18) at the bottom center and an exhaust hole (19) at the top. One end of the exhaust hole (19) is connected to the collection hole (18), and the other end passes through the top of the sampling block (16). A float (20) is provided inside the collection hole (18), and the float (20) and the collection hole (18) are spaced apart; A collection rod (21) is provided inside the exhaust port (19), and a pressure sensor (22) is provided at one end of the collection rod (21) near the collection groove (23).

8. The gas flow meter according to claim 7, characterized in that: The shape of the collection hole (18) and the float (20) are both inverted frustum shapes; The collection hole (18) is provided with a collection groove (23) at one end near the cavity (1). The collection hole (18) and the collection groove (23) are connected. The shape of the collection groove (23) is a frustum of a circle.

9. The gas flow meter according to claim 7, characterized in that: Multiple connecting rods (24) are provided between the exhaust port (19) and the collection rod (21).

10. The gas flow meter according to claim 7, characterized in that: A protective tube (25) is provided at one end edge of the collection hole (18) near the top of the float (20), and a protective cover (26) is provided at the end of the protective tube (25) away from the float (20).

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