A porous balanced flowmeter with dynamically adjustable aperture

Abstract

The present invention discloses a multi-hole balanced flowmeter with dynamically adjustable aperture, which belongs to the technical field of flowmeters and comprises: a first pipe and a second pipe, and a central pipe located between the first pipe and the second pipe, wherein both ends of the central pipe are connected to the inner walls of the first pipe and the second pipe in a telescopic manner; a pipe adjustment mechanism, wherein the pipe adjustment mechanism comprises a box body fixed to both ends of a base plate and provided with a slot, wherein a lead screw shaft and a guide column are correspondingly installed in the box body, one end of the lead screw shaft is connected to a motor, and a first slider is spirally driven on the outer wall of the lead screw shaft, and a second slider is movably connected to the guide column. The present invention can solve the technical problem that during high-frequency testing, even if a buffer is added, the orifice plate will generally be driven to move a corresponding distance, which will result in a reduction in the measuring area and an increase in the flow rate of the fluid, thereby affecting the data value brought by the differential pressure.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas treatment devices and methods, and in particular relates to a multi-porous balanced flowmeter with dynamically adjustable aperture. Background Art

[0002] The balanced flowmeter is a relatively specialized differential pressure flowmeter. It utilizes a unique constant Reynolds number, increased throttling thickness, and precision machining to achieve flow characteristics close to those of a Venturi flowmeter. While maintaining a simple and safe construction, it also offers a significant improvement in performance. Its ingenious structural design achieves a relatively small permanent pressure drop while maintaining a large, stable differential pressure, while minimizing straight pipe runs. This enables high-precision, long-term stable measurement. The operating temperature and pressure of the balanced flowmeter depend on the material and grade of the pipe and flange, but can reach temperatures up to 850°C. It is suitable for cryogenic fluids such as LNG, liquid air, liquid nitrogen, liquid oxygen, liquid argon, liquefied ethylene, liquid hydrogen, and liquid chlorine, effectively preventing vaporization and achieving optimal measurement results. The balanced flowmeter can measure vapor-liquid two-phase flow, slurries, and even solid particles.

[0003] The working principle of the balanced flowmeter is based on the differential pressure measurement principle. It balances the flow field through a symmetrical porous structure and calculates the fluid flow rate using the Bernoulli equation. Its core is to generate a stable differential pressure signal through a specially designed throttling device and combine it with fluid mechanics formulas to achieve high-precision measurement. The balanced flowmeter adopts a symmetrical porous structure design to reduce eddy currents, vibrations and signal noise, greatly improving the flow field stability and measuring accuracy by 5 to 10 times, and can even reach an accuracy of ±0.5%.

[0004] When the pipes on the balanced flowmeter are installed and connected to the external conduit, the pipes are usually fixed in design and cannot be adaptively installed and fixed with the external pipes. In addition, due to the design of the orifice plate in the balanced flowmeter itself, the initial force surface is large when it comes into contact with the water flow. During high-frequency testing, the lack of corresponding buffers will cause large stamping damage. Even if buffers are added, the orifice plate will generally move a corresponding distance, which will lead to a reduction in the measuring area and an increase in the flow rate of the fluid, thereby affecting the data value brought by the differential pressure and reducing the measurement accuracy. Summary of the Invention

[0005] The purpose of the present invention is to provide a porous balanced flowmeter with dynamically adjustable aperture to solve the technical problem that it cannot be adaptively installed and fixed with an external pipeline. During high-frequency testing, even if a buffer is added, the orifice plate will generally move a corresponding distance, which will lead to a reduction in the measuring area and an increase in the flow rate of the fluid, thereby affecting the data value brought by the differential pressure.

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

[0007] A porous balanced flowmeter with dynamically adjustable aperture, comprising:

[0008] A first pipe and a second pipe, and a central pipe located between the first pipe and the second pipe, wherein both ends of the central pipe are connected to the inner walls of the first pipe and the second pipe in a telescopic manner;

[0009] The pipeline adjustment mechanism includes a box body fixed to both ends of the base plate and having slots therein, a screw shaft and a guide column being correspondingly mounted within the box body, one end of the screw shaft being connected to the motor, and a first slider being spirally driven on the outer wall of the screw shaft, a second slider being movably connected to the guide column, and the tops of the first and second sliders being respectively fixed to the first and second pipelines via brackets;

[0010] The extension of one end of the bracket passes through the cover and extends to the first gear plate. The outer wall of the first gear plate is engaged with a central rotating tooth. One end of the movable shaft on the central rotating tooth extends to the rotating plate inside the first pipe and the second pipe.

[0011] Furthermore, a strip groove connected to the bracket is opened in the length direction of the outer wall of the cover, and the first sliding block and the second sliding block are symmetrically arranged relative to the center of the bottom plate.

[0012] Furthermore, it also includes a fluid measuring mechanism, which includes a retaining ring placed at the edge of the side wall of the first pipe, the inner wall of the retaining ring is connected to a fixed block through an inclined rod, and the center of the fixed block is connected to a first annular plate through a telescopic rod, a measuring area is formed between the first annular plate and the second annular plate, and the first annular plate and the second annular plate are both provided with pressure reducing holes adapted thereto, and the second annular plate is connected to the inner wall of the center pipe by locking and fixing with a positioning pin.

[0013] Furthermore, the first annular plate is movably connected to the inner wall of the central tube, and the two ends of the first annular plate and the retaining ring are connected by compression springs, the two sides of the extended end of the first annular plate and the third sliders at the upper and lower ends are connected by swing rods, and the third slider is connected to the limiting groove along the height direction of the inner wall of the central tube. One end of the third slider extends to the first pressure measuring tube, and cleaning brushes are provided on both sides of the third slider in the length direction of the first pressure measuring tube, and a second pressure measuring tube extending to the inside of the second pipe is provided on the outside of the second annular plate.

[0014] Furthermore, both ends of the swing rod are mounted on the third slider and the first annular plate by a rotational connection, one end of the third slider is connected to a telescopic plate placed between the first annular plate and the second annular plate through a mounting rod, a compartment is formed between the telescopic plate, the first annular plate, the second annular plate and the side wall of the central tube, and the tops of the first pressure measuring tube and the second pressure measuring tube both extend to the flow meter.

[0015] Furthermore, the outer wall of the first annular plate is connected to a second gear plate placed inside the shell through a push rod, and the outer wall of the second gear plate is meshed with a sprocket, the sprockets are vertically distributed along the height direction of the shell, and the sprockets are connected by chain transmission, and the rotating shafts at the centers of the sprockets are fixedly connected to guide plates extending to the outside of the shell, and both ends of the outer walls of the guide plates are integrally formed with slopes.

[0016] Furthermore, recessed openings are provided around the outer wall of the first annular plate, and the recessed openings are limitedly connected to a strip plate along the length direction of the side wall of the central tube, and one end of the recessed opening is connected to a T-slot near the center of the bottom plate, and the T-slot is in contact with the T-block, and the T-block and the strip plate are integrally formed.

[0017] Furthermore, both ends of the outer wall edge of the screw shaft are provided with rotation grooves placed on the box body, and the screw shaft and the output shaft of the motor are fixedly connected by a coupling, and the first pipe and the second pipe are both equipped with flanges connected to the external conduit.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] (1) In the present invention, when the length of the pipeline needs to be adjusted, the motor starts and drives the screw shaft to rotate. Under the action of the screw transmission, the first slider drives the first pipeline and the second pipeline at both ends to move in opposite directions through the bracket, so as to adjust the length of the flow meter. In addition, the second slider on the pipeline moves accordingly on the guide column, which can prevent the pipeline from deviating from its position during movement and has a good balancing effect, ensuring the stability of the pipeline during movement. In addition, as the pipeline becomes longer, the energy consumed on the inner wall of the pipeline increases due to the increase in the distance and time of fluid flow. Therefore, under the action of the gear meshing transmission, the rotating plate increases the flow rate of the fluid during rotation, thereby compensating for the energy loss caused by the excessive length of the pipeline and effectively improving the flow detection accuracy.

[0020] (2) In the present invention, the fluid is depressurized twice by a first annular plate and a second annular plate provided with two orifice plates, and pressure is measured before depressurization, after the first depressurization, and after the second depressurization, respectively. Two pressure differentials are obtained through two separate pressure measuring tubes, and the flow meter displays the flow rate for the two pressure differentials, respectively, thereby making the measurement result more accurate.

[0021] (3) In the present invention, during the flow of fluid, since the flow rate is calculated by using a pressure difference method, the first annular plate is designed with a spring assembly, which can effectively reduce the stamping damage caused by the initial contact of the fluid. Moreover, since the volume of the measuring area is reduced, the flow rate of the fluid passing through the pressure-reducing hole will be higher than the normal flow rate. Therefore, during the backward movement of the first annular plate, it can not only drive the third slider to move upward, thereby cooperating with the cleaning brush to clean the inner wall of the pipe, but also drive the telescopic plate on the third slider to move downward, thereby expanding the volume of the measuring area, so that it can compensate for the reduction in the measuring area caused by the backward movement of the first annular plate. At the same time, the first annular plate can drive the movement of the second gear plate. Under the action of mechanical transmission, the guide plate on the sprocket rotates and adjusts accordingly, and then expands the flow blocking area by rotating upward, so that the flow rate of the fluid is reduced, further compensating for the excessive flow rate data caused by the reduction in the volume of the measuring area, effectively improving the measurement data of the fluid flow, so that the first pressure measuring tube can avoid the poor data accuracy caused by the contamination of the inner wall of the pipe. Under the recovery action of the compression spring, it can help the transmission component reset and wait for the next test measurement work, thereby improving the reliability and safety of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a porous balanced flowmeter with dynamically adjustable pore size according to the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of a porous balanced flowmeter with dynamically adjustable pore size according to the present invention. Figure 2 ;

[0025] Figure 3 It is a front view of a porous balanced flowmeter with dynamically adjustable aperture according to the present invention;

[0026] Figure 4 It is a schematic diagram of the interior of the cover body of the present invention;

[0027] Figure 5 Schematic diagram of the meshing transmission between the first gear plate and the central rotating gear of the present invention;

[0028] Figure 6 This is a schematic diagram of the interior of a porous balanced flowmeter with dynamically adjustable pore size according to the present invention;

[0029] Figure 7 It is a transmission schematic diagram of the sprocket and chain of the present invention;

[0030] Figure 8 This is a schematic diagram of the connection between the retaining ring and the first annular plate of the present invention. Figure 1 ;

[0031] Figure 9 This is a schematic diagram of the connection between the retaining ring and the first annular plate of the present invention. Figure 2 .

[0032] Reference numerals: 1, first pipe; 2, second pipe; 3, center pipe; 4, pipe adjustment mechanism; 5, box body; 6, lead screw shaft; 7, guide column; 8, motor; 9, first slider; 10, second slider; 11, cover body; 12, first gear plate; 13, center gear; 14, rotating plate; 15, fluid measuring mechanism; 16, retaining ring; 17, inclined rod; 18, fixed block; 19, telescopic rod; 20, first annular plate; 21. Second annular plate; 22. Pressure-reducing hole; 23. Compression spring; 24. Third slider; 25. Swing rod; 26. First pressure measuring tube; 27. Second pressure measuring tube; 28. Mounting rod; 29. ​​Telescopic plate; 30. Push rod; 31. Housing; 32. Second gear plate; 33. Sprocket; 34. Chain; 35. Guide plate; 36. Slope; 37. Recessed mouth; 38. Strip plate; 39. T-slot; 40. Flange. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Manual Figure 1 -Attached Figure 9 As shown, a porous balanced flowmeter with dynamically adjustable pore size comprises:

[0035] A first pipe 1 and a second pipe 2, and a central pipe 3 located between the first pipe 1 and the second pipe 2, both ends of the central pipe 3 are connected to the inner walls of the first pipe 1 and the second pipe 2 by telescopic movement;

[0036] The pipeline adjustment mechanism 4 includes a box body 5 fixed to both ends of the base plate and having slots therein. A screw shaft 6 and a guide column 7 are correspondingly installed in the box body 5. One end of the screw shaft 6 is connected to the motor 8, and a first slider 9 is spirally driven on the outer wall of the screw shaft 6. A second slider 10 is movably connected to the guide column 7. The tops of the first slider 9 and the second slider 10 are respectively fixed to the first pipeline 1 and the second pipeline 2 through brackets.

[0037] One end of the bracket extends through the cover 11 and extends to the first gear plate 12. The outer wall of the first gear plate 12 is engaged with a central rotating tooth 13. One end of the movable shaft on the central rotating tooth 13 extends to the rotating plate 14 inside the first pipe 1 and the second pipe 2.

[0038] A strip groove connected to the bracket is opened in the length direction of the outer wall of the cover body 11, and the first slider 9 and the second slider 10 are symmetrically arranged relative to the center of the bottom plate. The protrusions at both ends of the first slider 9 are in contact with the inner wall of the box body 5. In this way, when the first slider 9 moves horizontally through the spiral transmission process, the setting of the protrusion can play a better limiting and guiding role, and has a corresponding driving force effect for the horizontally moving first slider 9.

[0039] When the length of the pipeline needs to be adjusted, the motor 8 starts and drives the screw shaft 6 to rotate. Under the action of the spiral transmission, the first slider 9 drives the first pipeline 1 and the second pipeline 2 at both ends to move in opposite directions through the bracket, so as to adjust the length of the flow meter, and the second slider 10 on the pipeline moves accordingly on the guide column 7, which can prevent the pipeline from deviating from its position during movement, and has a good balancing effect, ensuring the stability of the pipeline during movement. In addition, as the pipeline becomes longer, the energy consumed on the inner wall of the pipeline increases due to the increase in the distance and time of fluid flow. Therefore, under the action of the gear meshing transmission, the rotating plate 14 increases the flow rate of the fluid during rotation, thereby compensating for the energy loss caused by the excessive length of the pipeline, and effectively improving the flow detection accuracy.

[0040] By extension, an arc frame can be provided at the bottom of the first pipe 1 and the second pipe 2, and the bottom of the arc frame is movably connected to the bottom plate, so that the free movement of the first pipe 1 and the second pipe 2 can be ensured, and the corresponding supporting force can be improved, which can further ensure the stability of the connection between the first pipe 1 and the second pipe 2. The above-mentioned arc frame is an obvious conventional technical means for those skilled in the art. Therefore, there is no corresponding drawing to show it, but it does not affect the effective implementation of the technical solution of the present invention.

[0041] Specifically, the first pipe 1 and the second pipe 2 can be telescopically movable on the central pipe 3, which can effectively adjust the pipe length, thereby facilitating docking and installation with external pipes, facilitating personnel operation, and improving work efficiency.

[0042] The specific working principle of the pipeline regulating mechanism 4 is as follows:

[0043] When the lengths of the first pipe 1 and the second pipe 2 are adaptively lengthened, the flow rate of the fluid decreases due to energy loss caused by the longer distance, and the pipe can drive the rotating plate 14 on the central rotating tooth 13 to rotate. During the rotation, the rotating port area can be opened, and the flow rate can be expanded by increasing the fluid area. In this way, the flow rate reduction caused by the above-mentioned energy loss can be supplemented, effectively ensuring the normal fluid flow rate.

[0044] On the contrary, when the pipeline distance becomes shorter, the flow rate becomes larger accordingly, and the pipeline can drive the rotating plate 14 on the central rotating tooth 13 to rotate. During the rotation process, the rotating port area can be opened and the rotating port area can be reduced. By reducing the fluid area, the flow rate is reduced, and the increased fluid flow rate is reduced to ensure a normal fluid flow rate.

[0045] The fluid is depressurized twice by a first annular plate 20 and a second annular plate 21 provided with two orifice plates, and pressure is measured before depressurization, after the first depressurization, and after the second depressurization, respectively. Two pressure differentials are obtained through two separate pressure measuring tubes, and the flow meter displays the flow rate size for the two pressure differentials respectively, thereby making the measurement result more accurate.

[0046] A porous balanced flowmeter with dynamically adjustable aperture also includes a fluid measuring mechanism 15, which includes a retaining ring 16 placed at the edge of the side wall of the first pipe 1, and the inner wall of the retaining ring 16 is connected to a fixed block 18 through an inclined rod 17. The center of the fixed block 18 is connected to a first annular plate 20 through a telescopic rod 19. A measuring area is formed between the first annular plate 20 and the second annular plate 21, and the first annular plate 20 and the second annular plate 21 are both provided with pressure reducing holes 22 that are compatible with them. The second annular plate 21 is connected to the inner wall of the center pipe 3 by locking and fixing with a positioning pin.

[0047] The first annular plate 20 is movably connected to the inner wall of the central tube 3, and the two ends of the first annular plate 20 and the retaining ring 16 are connected by compression springs 23. The third sliders 24 on both sides of the extended end of the first annular plate 20 and the upper and lower ends are connected by swing rods 25. The third slider 24 is connected to the limiting groove along the height direction of the inner wall of the central tube 3. One end of the third slider 24 extends to the first pressure measuring tube 26. Cleaning brushes are provided on both sides of the third slider 24 in the length direction of the first pressure measuring tube 26. A second pressure measuring tube 27 extending to the inside of the second pipe 2 is provided on the outside of the second annular plate 21.

[0048] Both ends of the swing rod 25 are mounted on the third slider 24 and the first annular plate 20 by a rotational connection. One end of the third slider 24 is connected to a telescopic plate 29 placed between the first annular plate 20 and the second annular plate 21 through a mounting rod 28. A compartment is formed between the telescopic plate 29, the first annular plate 20, the second annular plate 21 and the side wall of the central tube 3. The tops of the first pressure measuring tube 26 and the second pressure measuring tube 27 both extend to the flow meter.

[0049] The provision of the telescopic plate 29 can not only change the size of the fluid measurement area, but also ensure the normal movement of the first annular plate 20 during the extrusion process, thereby avoiding the phenomenon of interference in the movement of the transmission parts.

[0050] The pressure-reducing holes 22 on the first annular plate 20 and the second annular plate 21 act as a pressure-reducing medium, thereby forming a pressure difference on both sides of the annular plates. This enables the Bernoulli equation to be used to calculate the fluid flow rate based on the differential pressure measurement principle and by balancing the flow field through the symmetrical porous structure.

[0051] During the fluid flow process, since the flow rate is calculated by using a pressure difference method, the first annular plate 20 is designed with a spring assembly, which can effectively reduce the stamping damage caused by the initial contact of the fluid, and since the volume of the measuring area is reduced, the fluid flow through the pressure-reducing hole 22 will be higher than the normal flow rate. Therefore, during the backward movement of the first annular plate 20, it can not only drive the third slider 24 to move upward, thereby cooperating with the cleaning brush to clean the inner wall of the pipeline, but also drive the telescopic plate 29 on the third slider 24 to move downward, thereby expanding the volume of the measuring area, so that it can compensate for the measurement area surface caused by the backward movement of the first annular plate 20. The volume of the measuring area is reduced, and at the same time, the first annular plate 20 can drive the movement of the second gear plate 32. Under the action of mechanical transmission, the guide plate 35 on the sprocket 33 rotates and adjusts accordingly, and then expands the baffle area by rotating upward, so that the flow rate of the fluid is reduced, and further compensates for the excessive flow data due to the reduction in the volume of the measuring area, effectively improving the measurement data of the fluid flow, so that the first pressure measuring tube 26 can avoid the poor data accuracy caused by the dirt on the inner wall of the pipeline. Under the elastic recovery action of the compression spring 23, it can help the transmission component to reset and wait for the next test measurement work, thereby improving the reliability and safety of the flow meter.

[0052] In addition, the retaining ring 16 at the edge of the side wall of the first pipe 1 is fixedly arranged, so that the first annular plate 20 can be prevented from driving the synchronous movement of the retaining ring 16 during the movement. At the same time, the telescopic rod 19 on the first annular plate 20 can allow the first annular plate 20 to move horizontally normally. Moreover, during the horizontal movement of the first annular plate 20, due to the rotating connection setting of the swing rod 25, it can not only clean the measuring area through the transmission part, but also compensate for the flow rate lost by the fluid flow. When the sprocket 33 on the chain 34 rotates during the transmission process, it can also supplement the flow rate lost by the fluid flow through the shielding effect. Moreover, the slope 36 on the guide plate 35 can play a role in smooth transition of the flowing fluid, thereby ensuring the normal flow of the fluid by reducing the resistance, and further increasing the stability of the flowmeter.

[0053] Specifically, the outer wall of the first annular plate 20 is connected to a second gear plate 32 housed within the housing 31 via a push rod 30. The outer wall of the second gear plate 32 is meshed with a sprocket 33. The sprockets 33 are vertically distributed along the height of the housing 31 and are connected to each other via a chain 34. The rotating shafts at the centers of the sprockets 33 are fixedly connected to guide plates 35 extending to the exterior of the housing 31. Both ends of the outer walls of the guide plates 35 are integrally connected with ramps 36. Recesses 37 are defined around the outer wall of the first annular plate 20. These recesses 37 are positionally connected to strip plates 38 along the length of the sidewall of the central tube 3. One end of the recess 37, near the center of the bottom plate, is connected to a T-slot 39. The T-slot 39 engages a T-block, and the T-block and strip plates 38 are integrally formed.

[0054] Both ends of the outer wall edge of the screw shaft 6 are provided with rotation grooves placed on the box body 5, and the screw shaft 6 and the output shaft of the motor 8 are fixedly connected by a coupling. Flanges 40 connected to the external conduit are installed on the first pipe 1 and the second pipe 2.

[0055] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0056] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A porous balanced flowmeter with dynamically adjustable pore size, characterized in that: include: A first pipe (1) and a second pipe (2), and a central pipe (3) located between the first pipe (1) and the second pipe (2), wherein both ends of the central pipe (3) are connected to the inner walls of the first pipe (1) and the second pipe (2) in a telescopic manner; A pipeline regulating mechanism (4), the pipeline regulating mechanism (4) comprises a box body (5) fixed at both ends of a bottom plate and having slots, a screw shaft (6) and a guide column (7) are correspondingly installed in the box body (5), one end of the screw shaft (6) is connected to the motor (8), and a first slider (9) is spirally driven on the outer wall of the screw shaft (6), and a second slider (10) is movably connected to the guide column (7), and the tops of the first slider (9) and the second slider (10) are respectively fixed to the first pipeline (1) and the second pipeline (2) through brackets; An extension portion of one end of the bracket passes through the cover (11) and extends to the first gear plate (12); the outer wall of the first gear plate (12) is meshed with a central rotating tooth (13); one end of the movable shaft on the central rotating tooth (13) extends to a rotating plate (14) inside the first pipe (1) and the second pipe (2); The fluid measuring mechanism (15) is further comprised, wherein the fluid measuring mechanism (15) comprises a retaining ring (16) disposed at the edge of the side wall of the first pipe (1), the inner wall of the retaining ring (16) being connected to a fixing block (18) via an inclined rod (17), the center of the fixing block (18) being connected to a first annular plate (20) via a telescopic rod (19), and a measuring area being formed between the first annular plate (20) and the second annular plate (21); The first annular plate (20) is movably connected to the inner wall of the central tube (3), and both ends of the first annular plate (20) and the retaining ring (16) are connected by compression springs (23). The third sliders (24) on both sides of the extended end of the first annular plate (20) and at the upper and lower ends are connected by swing rods (25). The third slider (24) is connected to the limiting groove along the height direction of the inner wall of the central tube (3). One end of the third slider (24) extends to the first pressure measuring tube (26). The first pressure measuring tube (26) is provided with cleaning brushes placed on both sides of the third slider (24) in the length direction. The second annular plate (21) is provided with a second pressure measuring tube (27) extending to the inside of the second pipe (2).

2. A porous balanced flowmeter with dynamically adjustable pore size according to claim 1, characterized in that: A strip groove connected to the bracket is provided in the length direction of the outer wall of the cover body (11), and the first slider (9) and the second slider (10) are symmetrically arranged relative to the center of the base plate.

3. The porous balanced flowmeter with dynamically adjustable pore size according to claim 1, characterized in that: The first annular plate (20) and the second annular plate (21) are both provided with pressure-reducing holes (22) adapted thereto, and the second annular plate (21) is connected to the inner wall of the central tube (3) by means of a locking and fixing method using a positioning pin.

4. The porous balanced flowmeter with dynamically adjustable pore size according to claim 1, characterized in that: Both ends of the swing rod (25) are mounted on the third slider (24) and the first annular plate (20) by means of a rotational connection. One end of the third slider (24) is connected to a telescopic plate (29) disposed between the first annular plate (20) and the second annular plate (21) via a mounting rod (28). A compartment is formed between the telescopic plate (29), the first annular plate (20), the second annular plate (21) and the side wall of the central tube (3). The tops of the first pressure measuring tube (26) and the second pressure measuring tube (27) both extend to the flow meter.

5. The porous balanced flowmeter with dynamically adjustable pore size according to claim 4, characterized in that: The outer wall of the first annular plate (20) is connected to a second gear plate (32) disposed inside the housing (31) via a push rod (30); the outer wall of the second gear plate (32) is meshed with a sprocket (33); the sprockets (33) are vertically distributed along the height direction of the housing (31), and the sprockets (33) are connected to each other via a chain (34); the rotating shafts at the centers of the sprockets (33) are fixedly connected to a guide plate (35) extending to the outside of the housing (31); and both ends of the outer wall of the guide plate (35) are integrally formed with a slope (36).

6. The porous balanced flowmeter with dynamically adjustable aperture according to claim 4, characterized in that: The outer wall of the first annular plate (20) is provided with recessed openings (37) all around, and the recessed openings (37) are connected to a strip plate (38) in a limited manner along the length direction of the side wall of the central tube (3), and one end of the recessed opening (37) is connected to a T-shaped slot (39) near the center of the bottom plate, and the T-shaped slot (39) is in contact with a T-shaped block, and the T-shaped block and the strip plate (38) are integrally formed.

7. The porous balanced flowmeter with dynamically adjustable aperture according to claim 1, characterized in that: Both ends of the outer wall edge of the screw shaft (6) are provided with a rotation groove placed on the box body (5), and the screw shaft (6) and the output shaft of the motor (8) are fixedly connected via a coupling, and the first pipe (1) and the second pipe (2) are both installed with a flange (40) connected to the external conduit.

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