Porous balance flowmeter with dynamically adjustable aperture

Abstract

The invention discloses a porous balance flowmeter with dynamically adjustable aperture, and belongs to the technical field of flowmeters, the porous balance flowmeter comprises a first pipeline, a second pipeline and a central pipe located between the first pipeline and the second pipeline, and the two ends of the central pipe are connected to the inner walls of the first pipeline and the second pipeline in a telescopic movable mode; the pipeline adjusting mechanism comprises a box body which is fixed to the two ends of the bottom plate and provided with a notch, 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 the motor, a first sliding block is arranged on the outer wall of the lead screw shaft in a spiral transmission mode, and a second sliding block is movably connected to the guide column. According to the invention, the technical problem that a data value brought by differential pressure is influenced due to the fact that a measurement area is reduced and the flow velocity of fluid is increased because the pore plate is generally driven to move by a corresponding distance even if a buffer piece is additionally arranged during high-frequency test work can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas treatment devices and methods, and particularly relates to a porous balanced flowmeter with dynamically adjustable pore diameters. Background Art

[0002] A balanced flowmeter is a relatively special differential pressure type flowmeter. It adopts a unique equal Reynolds number, increases the thickness of the throttling element and the machining accuracy, making the flow performance close to that of a Venturi. Its structure is still simple, safe, and has a qualitative leap in performance. The ingenious structural design can, under the requirement of the shortest straight pipe section, use a relatively small permanent pressure loss to obtain a large stable differential pressure, achieving high-precision long-term stable measurement. The working temperature and pressure of the balanced flowmeter depend on the material and grade of the pipeline and flange. The working temperature can reach up to 850°C at most, and it is suitable for extremely low-temperature fluids such as LNG, liquid air, liquid nitrogen, liquid oxygen, liquid argon, liquefied ethylene, liquid hydrogen, liquid chlorine, etc., and can effectively prevent gasification with the best measurement effect. The balanced flowmeter can measure gas-liquid two-phase, 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 symmetric porous structure and calculates the fluid flow using Bernoulli's equation. Its core is to generate a stable differential pressure signal through a specially designed throttling device and achieve high-precision measurement in combination with fluid mechanics formulas. The balanced flowmeter adopts a symmetric porous structure design, reducing eddy currents, vibrations, and signal noise, greatly improving the stability of the flow field, and increasing the measurement accuracy by 5 to 10 times, and even achieving an accuracy of ±0.5%.

[0004] When the pipeline on the balanced flowmeter is installed and connected to an external conduit, since the pipeline is usually of a fixed design and cannot be adaptively installed and fixed to the external pipeline. In addition, due to the design of the orifice plate in the balanced flowmeter, the initial stress surface is relatively large when it comes into contact with water flow. During high-frequency test work, without corresponding buffer parts, the stamping damage generated is relatively large. Even if buffer parts are added, generally, the orifice plate will move a corresponding distance, which will lead to a reduction in the measurement area and an increase in the fluid flow velocity, 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 pore diameters to solve the technical problems that it cannot be adaptively installed and fixed to the external pipeline, and during high-frequency test work, even if buffer parts are added, generally, the orifice plate will move a corresponding distance, which will lead to a reduction in the measurement area and an increase in the fluid flow velocity, thereby affecting the data value brought by the differential pressure.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A porous balanced flowmeter with dynamically adjustable pore diameters, comprising: A first pipe and a second pipe, and a central pipe located between the first pipe and the second pipe. Both ends of the central pipe are connected to the inner walls of the first pipe and the second pipe in a telescopic and movable manner; A pipe adjusting mechanism. The pipe adjusting mechanism includes boxes fixed at both ends of a bottom plate and having notches. Inside the boxes, a lead screw shaft and a guide post are correspondingly installed. One end of the lead screw shaft is connected to a motor, and a first slider is helically driven on the outer wall of the lead screw shaft. A second slider is movably connected to the guide post. The tops of the first slider and the second slider are respectively fixed to the first pipe and the second pipe through brackets; One end of the bracket extends through a cover body and extends to a first gear plate. A central rotating tooth is meshed and driven on the outer wall of the first gear plate. One end of the movable shaft on the central rotating tooth extends to a rotating plate inside the first pipe and the second pipe.

[0007] Further, a strip-shaped groove connected to the bracket is provided on the outer wall of the cover body in the length direction, and the first slider and the second slider are symmetrically arranged with respect to the center of the bottom plate.

[0008] Further, a fluid measuring mechanism is also included. The fluid measuring mechanism includes a retaining ring placed at the edge of the side wall of the first pipe. A fixing block is connected to the inner wall of the retaining ring through an inclined rod. A first annular plate is connected to the center of the fixing block through a telescopic rod. A measuring area is formed between the first annular plate and the second annular plate, and pressure-reducing holes adapted to them are provided on both the first annular plate and the second annular plate. The second annular plate is connected to the inner wall of the central pipe in a manner of being locked and fixed by a positioning pin.

[0009] Further, the first annular plate is movably connected to the inner wall of the central pipe, and both ends of the first annular plate are connected to the retaining ring through compression springs. Swing rods are respectively connected between the extending ends on both sides and the upper and lower ends of the first annular plate and a third slider. The third slider is connected to a limiting groove along the height direction of the inner wall of the central pipe. One end of the third slider extends to a first pressure measuring pipe. Cleaning brushes are provided on both sides of the third slider along the length direction of the first pressure measuring pipe. A second pressure measuring pipe extending into the second pipe is provided outside the second annular plate.

[0010] Further, both ends of the swing rod are installed on the third slider and the first annular plate through rotational connections. 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 partition chamber is formed between the telescopic plate, the first annular plate, the second annular plate, and the side wall of the central pipe. The tops of the first pressure measuring pipe and the second pressure measuring pipe both extend to a flow meter.

[0011] Further, a second gear plate located inside the housing is connected to the outer wall of the first annular plate through a push rod. A sprocket is meshed and driven on the outer wall of the second gear plate. The sprockets are vertically distributed along the height direction of the housing, and the sprockets are connected by a chain drive. The rotating shafts at the centers of the sprockets are fixedly connected with flow guide plates extending to the outside of the housing. Slopes are integrally formed at both ends of the outer wall of the flow guide plate.

[0012] Further, recessed openings are formed around the outer wall of the first annular plate. A strip-shaped plate is connected to the recessed openings along the length direction of the side wall of the central tube in a limiting manner. One end of the recessed opening is connected to a T-shaped groove near the center of the bottom plate. A T-shaped block is in contact and fit on the T-shaped groove. The T-shaped block and the strip-shaped plate are integrally formed.

[0013] Further, rotating grooves are provided at both ends of the outer wall edge of the lead screw shaft and are located on the box body. The lead screw shaft and the output shaft of the motor are fixedly connected through a coupling. Flange plates connected to external conduits are installed on both the first pipe and the second pipe.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: In the present invention, when the length of the pipeline needs to be adjusted, the motor is started to drive the rotation of the lead screw shaft. Under the action of screw drive, the first slider drives the first pipe and the second pipe at both ends to move in opposite directions through the bracket, so as to adjust the length of the flowmeter. Moreover, the second slider on the pipeline moves correspondingly on the guide post, which can prevent the pipeline from deviating in position during the movement, and has a good balance effect to ensure the smoothness of the pipeline during the movement. In addition, during the lengthening process of the pipeline, since the flow distance and time of the fluid become longer, the energy consumed on the inner wall of the pipeline also increases accordingly. Therefore, under the action of gear meshing drive, during the rotation of the rotating plate, the flow rate of the fluid is increased, thereby making up for the energy loss caused by the too long pipeline and effectively improving the detection accuracy of the flow rate.

[0015] In the present invention, the fluid is depressurized twice on the first annular plate and the second annular plate provided with two orifice plates, and pressure measurement is respectively carried out before depressurization, after the first depressurization, and after the second depressurization. Two separate pressure measurement tubes are used to obtain the two pressure differences, and the flowmeter displays the flow rate for the two pressure differences respectively, so that the measurement result is more accurate.

[0016] In the present invention, during the fluid flow process, since the flow rate is calculated by means of pressure difference and the first annular plate is designed with a spring assembly, it can effectively reduce the stamping damage caused by the initial contact of the fluid. Moreover, due to the reduction of the volume of the measurement area, the fluid flow rate through the pressure reduction 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, so as to cooperate with the cleaning brush to clean the inner wall of the pipeline, but also drive the telescopic plate on the third slider to move downward, thereby expanding the volume of the measurement area, enabling compensation for the reduction of the measurement 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 deflector on the sprocket rotates and adjusts accordingly, and then expands the flow blocking area by rotating upward, reducing the fluid flow rate, further compensating for the excessive flow rate data caused by the reduction of the measurement area volume, effectively improving the measurement data of the fluid flow rate, enabling the first pressure measuring tube to avoid the poor data accuracy caused by the dirt on the inner wall of the pipeline. Under the restoring action of the compression spring, it can help the transmission parts to reset, waiting for the next test measurement work, improving the reliability and safety of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a porous balanced flowmeter with dynamically adjustable aperture of the present invention Figure 1 ; Figure 2 is a schematic structural diagram of a porous balanced flowmeter with dynamically adjustable aperture of the present invention Figure 2 ; Figure 3 is a front view of a porous balanced flowmeter with dynamically adjustable aperture of the present invention; Figure 4 is an internal schematic diagram of the first pipeline of the present invention; Figure 5 is a schematic diagram of the meshing transmission of the first gear plate and the central rotating tooth of the present invention; Figure 6 is an internal schematic diagram of a porous balanced flowmeter with dynamically adjustable aperture of the present invention; Figure 7 is a schematic diagram of the transmission of the sprocket and the chain of the present invention; Figure 8 is a connection schematic diagram of the retaining ring and the first annular plate of the present inventionFigure 1 ; Figure 9 is a schematic diagram of the connection between the retaining ring and the first annular plate of the present invention Figure 2 .

[0019] Reference numerals: 1, first pipeline; 2, second pipeline; 3, central pipe; 4, pipeline adjusting mechanism; 5, box body; 6, lead screw shaft; 7, guide post; 8, motor; 9, first slider; 10, second slider; 11, cover body; 12, first gear plate; 13, central rotating 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 pipe; 27, second pressure measuring pipe; 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, concave opening; 38, strip plate; 39, T-shaped groove; 40, flange plate. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Refer to the attached Figure 1 - attached Figure 9 As shown, a porous balanced flowmeter with dynamically adjustable aperture includes: A first pipeline 1 and a second pipeline 2, and a central pipe 3 located between the first pipeline 1 and the second pipeline 2. Both ends of the central pipe 3 are connected to the inner walls of the first pipeline 1 and the second pipeline 2 in a telescopic and movable manner; A pipeline adjusting mechanism 4, which includes a box body 5 fixed at both ends of the bottom plate and provided with notches. A lead screw shaft 6 and a guide post 7 are correspondingly installed in the box body 5. One end of the lead screw shaft 6 is connected to the motor 8, and a first slider 9 is helically driven on the outer wall of the lead screw shaft 6. A second slider 10 is movably connected to the guide post 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; One end of the bracket extends through the cover body 11 and extends to the first gear plate 12. The outer wall of the first gear plate 12 is meshed and driven with a central rotating gear 13. One end of the movable shaft on the central rotating gear 13 extends to the rotating plate 14 inside the first pipeline 1 and the second pipeline 2.

[0022] A strip-shaped 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 with respect to the center of the bottom plate. The protruding parts at both ends of the first slider 9 are in contact with and fit on the inner wall of the box body 5. In this way, during the horizontal movement of the first slider 9 through the screw drive process, the setting of the protruding parts can play a good limiting and guiding role, and there is a corresponding driving force effect on the horizontally moving first slider 9.

[0023] When the length of the pipeline needs to be adjusted, the motor 8 starts and drives the rotation of the lead screw shaft 6. Under the screw drive action, 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 flowmeter. Moreover, the second slider 10 on the pipeline moves correspondingly on the guide post 7, which can prevent the pipeline from deviating in position during the movement process, and has a good balancing effect to ensure the smoothness of the pipeline during the movement process. In addition, during the process of the pipeline becoming longer, since the flow distance and time of the fluid become longer, the energy consumed on the inner wall of the pipeline also increases accordingly. Therefore, under the action of gear meshing transmission, the rotating plate 14 increases the flow rate of the fluid during the rotation process, thereby compensating for the energy loss caused by the too long pipeline and effectively improving the detection accuracy of the flow rate.

[0024] Furthermore, arc-shaped frames can be provided at the bottoms of the first pipeline 1 and the second pipeline 2. The bottoms of the arc-shaped frames are movably connected to the bottom plate. In this way, it can not only ensure the free movement of the first pipeline 1 and the second pipeline 2, but also improve the corresponding supporting force, and can further ensure the stability of the connection between the first pipeline 1 and the second pipeline 2. The above-mentioned arc-shaped frames are obvious conventional technical means for those skilled in the art. Therefore, there are no corresponding drawings shown, but it does not affect the effective implementation of the technical solution of the present invention.

[0025] Specifically, the first pipeline 1 and the second pipeline 2 can telescopically move on the central pipe 3, which can effectively adjust the pipeline length, thus facilitating the docking and installation work with external pipelines, convenient for personnel operation, and improving work efficiency.

[0026] The specific working principle of the pipeline adjusting mechanism 4 is as follows: When the lengths of the first pipeline 1 and the second pipeline 2 adaptively become longer, the flow rate of the fluid decreases due to the energy loss caused by the longer distance. Then the pipeline can drive the rotating plate 14 on the central rotating gear 13 to rotate. During the rotation process, the rotating port area can be opened, and the flow rate is increased by increasing the fluid area, so as to supplement the flow rate reduction caused by the above-mentioned energy loss and effectively ensure the normal fluid flow rate.

[0027] Conversely, when the pipeline distance becomes shorter, the flow rate correspondingly increases. The pipeline can drive the rotating plate 14 on the central rotating gear 13 to rotate. During the rotation process, the rotating port area can be opened and then reduced. By reducing the fluid area, the flow rate is further decreased to reduce the increased fluid flow rate and ensure it remains at a normal fluid flow rate.

[0028] The fluid is depressurized twice through the first annular plate 20 and the second annular plate 21 provided with two orifice plates. Pressure measurement is carried out before pressure reduction, after the first pressure reduction, and after the second pressure reduction respectively. Two separate pressure measurement tubes are used to obtain the two pressure differences, and the flow meter displays the flow rate sizes corresponding to the two pressure differences respectively, thereby making the measurement results more accurate.

[0029] A porous balanced flow meter with dynamically adjustable orifice diameters further includes a fluid measurement mechanism 15. The fluid measurement mechanism 15 includes a retaining ring 16 placed at the edge of the side wall of the first pipeline 1. 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 measurement area is formed between the first annular plate 20 and the second annular plate 21, and pressure reduction holes 22 adapted to them are provided on both the first annular plate 20 and the second annular plate 21. The second annular plate 21 is connected to the inner wall of the central pipe 3 by means of locking and fixing with a positioning pin.

[0030] The first annular plate 20 is movably connected to the inner wall of the central pipe 3, and compression springs 23 are connected between both ends of the first annular plate 20 and the retaining ring 16. Swing rods 25 are connected between both sides and the upper and lower ends of the extending ends of the first annular plate 20 and third sliders 24. The third sliders 24 are connected with limit slots along the height direction of the inner wall of the central pipe 3. One end of the third slider 24 extends to the first pressure measurement tube 26, and cleaning brushes are provided on both sides of the third slider 24 along the length direction of the first pressure measurement tube 26. A second pressure measurement tube 27 extending into the second pipeline 2 is provided outside the second annular plate 21.

[0031] Both ends of the swing rod 25 are installed on the third slider 24 and the first annular plate 20 by means of 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 partition cavity is formed between the telescopic plate 29, the first annular plate 20, the second annular plate 21, and the side wall of the central pipe 3. The tops of the first pressure measurement tube 26 and the second pressure measurement tube 27 both extend to the flow meter.

[0032] The setting 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 extrusion, thus avoiding the phenomenon of movement interference of transmission parts.

[0033] The pressure-reducing holes 22 on the first annular plate 20 and the second annular plate 21 serve as the pressure-reducing medium, thereby creating a pressure difference on both sides of the annular plate. In this way, based on the differential pressure measurement principle, the flow field can be balanced through a symmetric porous structure, and the fluid flow rate can be calculated using Bernoulli's equation.

[0034] During the fluid flow process, since the flow rate is calculated by means of differential pressure, a spring assembly is designed on the first annular plate 20, which can effectively reduce the impact damage caused by the initial contact of the fluid. Moreover, due to the reduction in the volume of the measurement area, the fluid flow rate passing through the pressure-reducing holes 22 will be higher than the normal flow rate. Therefore, when the first annular plate 20 moves backward, 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 measurement area, so as to compensate for the reduction in the measurement area caused by the backward movement of the first annular plate 20. 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 accordingly, and then the flow-blocking area is expanded by rotating upward, so that the fluid flow rate is reduced, further compensating for the excessive flow rate data caused by the reduction in the volume of the measurement area, effectively improving the measurement data of the fluid flow rate, enabling the first pressure measuring tube 26 to 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 parts to reset and wait for the next test measurement work, improving the reliability and safety of the flowmeter.

[0035] In addition, the retaining ring 16 at the edge of the side wall of the first pipeline 1 is fixedly arranged, which can prevent the first annular plate 20 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 allows the first annular plate 20 to move horizontally normally. Moreover, during the horizontal movement of the first annular plate 20, due to the rotational connection of the swing rod 25, it can not only clean the measurement area through the transmission parts, but also compensate for the flow rate loss caused by the fluid flow. When the sprocket 33 on the chain 34 rotates during the transmission process, it can also supplement the flow rate loss caused by the fluid flow through the blocking effect. Moreover, the slope surface 36 on the guide plate 35 can play a role in smoothly transitioning the flowing fluid, ensuring the normal flow of the fluid by reducing the resistance, and further increasing the stability of the flowmeter operation.

[0036] Specifically, the outer wall of the first annular plate 20 is connected to a second gear plate 32 placed inside the housing 31 through a push rod 30, and the outer wall of the second gear plate 32 is meshed with a sprocket 33, which is vertically distributed along the height direction of the housing 31, and the sprockets 33 are connected through a chain 34, and the rotating shafts at the center 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 connected with a ramp 36. The outer wall of the first annular plate 20 is provided with a recessed opening 37 all around, and the recessed opening 37 is limitedly connected to a strip plate 38 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-slot 39 near the center of the bottom plate, and the T-slot 39 abuts against and fits the T-block, and the T-block and the strip plate 38 are integrally formed.

[0037] 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 pipeline 1 and the second pipeline 2.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0039] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A porous balanced flowmeter with dynamically adjustable aperture, characterized in that, Including: 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) in a telescopic and movable manner; A pipe adjusting mechanism (4), the pipe adjusting mechanism (4) includes a box body (5) fixed at both ends of the bottom plate and provided with notches, a lead screw shaft (6) and a guide post (7) are correspondingly installed in the box body (5), one end of the lead screw shaft (6) is connected to a motor (8), and a first slider (9) is helically driven on the outer wall of the lead screw shaft (6), a second slider (10) is movably connected to the guide post (7), and the tops of the first slider (9) and the second slider (10) are respectively fixed on the first pipe (1) and the second pipe (2) through brackets; One end of the bracket extends through a cover body (11) and extends to a first gear plate (12), a central rotating tooth (13) is meshed and driven on the outer wall of the first gear plate (12), and 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).

2. The porous balanced flowmeter with dynamically adjustable aperture according to claim 1, characterized in that, A strip-shaped 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 with respect to the center of the bottom plate.

3. A porous balanced flowmeter with dynamically adjustable aperture according to claim 1, characterized in that It also includes a fluid measuring mechanism (15), the fluid measuring mechanism (15) includes a retaining ring (16) placed at the edge of the side wall of the first pipe (1), a fixed block (18) is connected to the inner wall of the retaining ring (16) through an inclined rod (17), a first annular plate (20) is connected to the center of the fixed block (18) through a telescopic rod (19), a measuring area is formed between the first annular plate (20) and the second annular plate (21), and pressure-reducing holes (22) adapted to them are provided on both the first annular plate (20) and the second annular plate (21), and the second annular plate (21) is connected to the inner wall of the central pipe (3) by means of locking and fixing with a positioning pin.

4. The porous balanced flowmeter with dynamically adjustable aperture according to claim 3, characterized in that, The first annular plate (20) is movably connected to the inner wall of the central pipe (3), and both ends of the first annular plate (20) are connected to the retaining ring (16) through compression springs (23), both sides and the upper and lower ends of the extending ends of the first annular plate (20) are connected to a third slider (24) through swing rods (25), a limiting groove is connected to the third slider (24) along the height direction of the inner wall of the central pipe (3), one end of the third slider (24) extends to a first pressure measuring pipe (26), cleaning brushes are provided on both sides of the third slider (24) in the length direction of the first pressure measuring pipe (26), and a second pressure measuring pipe (27) extending into the second pipe (2) is provided outside the second annular plate (21).

5. A porous balanced flowmeter with dynamically adjustable aperture according to claim 4, characterized in that, Both ends of the swing rod (25) are mounted on the third slider (24) and the first annular plate (20) in a rotatable connection manner. One end of the third slider (24) is connected by a mounting rod (28) to a telescopic plate (29) disposed between the first annular plate (20) and the second annular plate (21). A partition chamber 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 onto the flow meter.

6. The porous balanced flowmeter with dynamically adjustable aperture according to claim 5, wherein On the outer wall of the first annular plate (20), a second gear plate (32) disposed inside the housing (31) is connected by a push rod (30). A sprocket (33) is meshed and driven on the outer wall of the second gear plate (32). The sprockets (33) are vertically distributed along the height direction of the housing (31), and the sprockets (33) are drivingly connected by a chain (34). The rotating shafts at the centers of the sprockets (33) are fixedly connected to guide plates (35) extending outside the housing (31). Slopes (36) are integrally formed at both ends of the outer wall of the guide plate (35).

7. A porous balanced flowmeter with dynamically adjustable aperture according to claim 5, characterized in that, Depression openings (37) are formed around the outer wall of the first annular plate (20). A strip plate (38) is connected to the depression openings (37) in a limiting manner along the length direction of the side wall of the central tube (3). One end of the depression opening (37) is connected to a T-shaped groove (39) near the center of the bottom plate. A T-shaped block abuts and fits on the T-shaped groove (39). The T-shaped block and the strip plate (38) are integrally formed.

8. A porous balanced flowmeter with dynamically adjustable aperture according to claim 1, characterized in that, Rotating grooves are provided at both ends of the outer wall edge of the lead screw shaft (6) on the box body (5), and the lead screw shaft (6) and the output shaft of the motor (8) are fixedly connected by a coupling. Flange plates (40) connected to external conduits are installed on both the first pipe (1) and the second pipe (2).

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