High-precision fluid measuring device capable of effectively measuring gas flow

Abstract

The invention discloses a high-precision fluid measuring device capable of effectively measuring gas flow, which comprises a measuring tube, two ends of the measuring tube are clamped and connected with correspondingly arranged connecting tubes through positioning pieces, a filtering mechanism is mounted on the connecting tube arranged on one side, and a pressure regulating mechanism is arranged in the middle of the measuring tube. Flow detection heads are symmetrically arranged at the lower end of the flow detection display screen, the two flow detection heads penetrate through the correspondingly arranged mounting cylinders and extend into the measuring tube, and pressure detectors are symmetrically mounted on the rear side of the measuring tube relative to the pressure regulating mechanism. According to the high-precision fluid measuring device capable of effectively measuring the gas flow, impurities in gas can be conveniently filtered and the gas can be conveniently dehumidified through a filter screen plate and moisture absorption cotton, so that the gas entering the measuring tube is not easy to damage a flow detection head, the measuring precision is improved, and meanwhile, an electric hydraulic rod is arranged to drive the filter screen plate to move, so that the measurement accuracy is improved. And impurities on the filter screen plate are removed under the action of the cleaning brush, so that the use practicability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to fluid measurement, and in particular to a high-precision fluid measuring device that effectively measures gas flow. Background Art

[0002] Fluid is the general term for gas and liquid. Atmosphere and water are the two most common fluids. Fluid is a form of object corresponding to solid, and is the general term for liquid and gas. It is composed of a large number of molecules that are constantly in thermal motion and have no fixed equilibrium position. Its basic characteristics are that it has no definite shape and has fluidity. Fluids have a certain compressibility. Liquids have very little compressibility, while gases have greater compressibility. When the shape of the fluid changes, there is also a certain resistance to movement (i.e., viscosity) between the layers of the fluid. When the viscosity and compressibility of the fluid are very small, it can be approximately regarded as an ideal fluid. It is an ideal model introduced by people to study the movement and state of fluids. It is the medium for hydraulic and pneumatic transmissions. A fluid measuring device is a device specifically used to measure the flow of gas or liquid. We can see these fluid measuring devices in many industries or pipelines.

[0003] After searching, it is found that the typical measuring device in the prior art is disclosed in the publication number CN206132141U, a gas flow measurement device, including a shell, a gas flow channel is provided in the shell, a flow sensor is provided in the gas flow channel, an on-off valve is provided in the gas flow channel downstream of the flow sensor along the gas flow direction, and the gas flow measurement device also includes a pressure sensor for monitoring the gas pressure in the flow channel section upstream of the on-off valve on the gas flow channel. When the pressure sensor detects that the gas pressure is lower than the set value, the on-off valve is closed to disconnect the gas flow channel. As the gas continues to enter the gas flow channel, the gas accumulates in the channel section of the gas flow channel upstream of the on-off valve, and the gas pressure gradually increases. When the gas pressure reaches the set value, the on-off valve is opened, and the gas will flow through the gas channel at a higher flow rate. The flow sensor realizes the measurement of the gas flow measurement, thereby realizing the flow measurement of small flow gas.

[0004] In summary, the existing fluid measuring device has a single function when in use, and does not process the gas to be measured in the pipeline, which makes it easy to cause damage to the measuring device during long-term measurement, reduce the reliability and service life of the measuring device, and reduce the measurement accuracy. In view of the above problems, it is necessary to improve the existing equipment. Summary of the invention

[0005] The object of the present invention is to provide a high-precision fluid measuring device for effectively measuring gas flow, so as to solve the problem that the existing fluid measuring device proposed in the above background technology has a single function when in use and does not process the gas to be measured in the pipeline, which makes it easy to cause damage to the measuring device during long-term measurement, reduce the reliability of the measuring device, shorten its service life, and reduce the measurement accuracy.

[0006] To achieve the above object, the present invention provides the following technical solution: a high-precision fluid measuring device for effectively measuring gas flow, comprising a measuring tube,

[0007] The two ends of the measuring tube are connected to the corresponding connecting tubes by means of positioning pieces, and the outer ends of the two connecting tubes are provided with mounting flanges, and a filter mechanism is installed on the connecting tube provided on one side, and the filter mechanism includes a mounting base and a filter screen plate, and the mounting base is connected to the lower end of the connecting tube by fixing screws, and a filter screen plate is installed on the inner side of the upper end of the mounting base, and the top of the filter screen plate passes through the bottom of the connecting tube and extends to the through hole opened at the upper end of the connecting tube, and a sealing member is provided between the inside of the through hole and the upper end of the filter screen plate;

[0008] A pressure regulating mechanism is arranged in the middle of the measuring tube, and the upper end of the measuring tube is located above the pressure regulating mechanism and sockets are symmetrically installed on both sides, and the two sockets are snap-connected with the lower ends of the corresponding mounting tubes, the tops of the two mounting tubes are connected with the lower ends of the flow detection display screen, and the lower ends of the flow detection display screen are symmetrically provided with flow detection heads, and the two flow detection heads pass through the corresponding mounting tubes and extend into the inside of the measuring tube, and a pressure detector is symmetrically installed on the rear side of the measuring tube with respect to the pressure regulating mechanism.

[0009] Preferably, an air inlet and an air outlet are respectively provided at both ends of the measuring tube, and one side of the air inlet is snap-connected to a connecting tube equipped with a filter mechanism, and the size of the air inlet and the air outlet is smaller than the middle inner diameter of the measuring tube.

[0010] Preferably, the connecting tube has symmetrically formed plug-in grooves on the inner side near one end of the measuring tube, and the two plug-in grooves are connected via a snap-fit ​​circular groove away from one end of the measuring tube, and the symmetrically arranged protrusions at one end of the measuring tube are slidably connected to the plug-in groove and the snap-fit ​​circular groove.

[0011] Preferably, the positioning member includes a positioning ring seat and a plug-in rod, and the positioning ring seat is sleeved on the outside of one end of the measuring tube. At the same time, the positioning ring seat is symmetrically provided with a plug-in rod on one side close to the connecting tube, and the two plug-in rods respectively pass through the corresponding plug-in grooves and extend to the inside of the engaging circular groove.

[0012] Preferably, a support frame is provided at the upper end of the filter screen plate outside the through hole, and an electric hydraulic rod is installed in the middle of the upper end of the support frame, and the output end of the electric hydraulic rod is connected to the middle of the upper end of the filter screen plate. The filter screen plate forms a movable structure through the electric hydraulic rod and the connecting pipe, and cleaning brushes are symmetrically provided on both sides of the lower end of the filter screen plate, and the tops of the two cleaning brushes pass through the connecting pipe and extend to the upper end inside the connecting pipe.

[0013] Preferably, the filter screen is located on both sides of the connecting tube with symmetrically arranged limit ring seats, and the outer walls of the two limit ring seats are snap-connected with the inner walls of the connecting tube. At the same time, the positioning plates symmetrically arranged on the upper ends of the two limit ring seats on opposite sides are respectively connected to the tops of the corresponding cleaning brushes, and the inner sides of the two limit ring seats are provided with hygroscopic cotton, and the hygroscopic cotton is a honeycomb structure.

[0014] Preferably, the pressure regulating mechanism includes a pressure regulating seat, and an electromagnetic valve is arranged inside the pressure regulating seat on the side close to the air inlet, and a plurality of ventilation holes are opened inside the pressure regulating seat on the side close to the exhaust port, a connecting seat is arranged at the bottom of the lower end of the pressure regulating seat, and a sealing sleeve is arranged on the outer side of the connecting seat, and the connecting seat passes through the measuring tube and the positioning frame and is connected to the sealing plate, soft metal plates are symmetrically arranged on both sides of the upper end of the sealing plate, and the upper end of the soft metal plate passes through the fixed extension plate correspondingly arranged on the side of the positioning frame, and the top of the soft metal plate is snap-connected with the outer side of the fixed extension plate.

[0015] Preferably, the ventilation hole is a funnel structure, and the diameter of the ventilation hole on a side close to the solenoid valve is larger than the diameter of the ventilation hole on a side away from the solenoid valve.

[0016] Compared with the prior art, the invention has the following beneficial effects: the high-precision fluid measuring device for effectively measuring gas flow rate is

[0017] (1) In order to solve the problem that the existing fluid measuring device has a single function when in use and does not process the gas to be measured in the pipeline, which makes it easy to cause damage to the measuring device during long-term measurement, reduces the reliability of the measuring device, shortens the service life, and reduces the measurement accuracy, the present application is provided with a filtering mechanism, which is convenient for filtering impurities in the gas and dehumidifying the gas through a filter screen and a moisture-absorbing cotton, so that the gas entering the measuring tube is not easy to cause damage to the flow detection head, thereby improving the measurement accuracy. At the same time, an electric hydraulic rod is provided to drive the filter screen to move, so that the impurities on the filter screen are removed by the action of a cleaning brush, thereby improving the practicality of use;

[0018] (2) In order to solve the problem that the existing fluid measuring device, when in use, connects the two tube bodies by bolts, making installation and disassembly inconvenient, and secondly, the internal pressure regulating device cannot be disassembled for maintenance. After damage, it needs to be replaced as a whole, which reduces resource utilization and increases maintenance costs. The present application connects the protrusion through the plug-in groove and the snap-fit ​​circular groove, and then rotates the connecting pipe and moves the positioning piece to insert into the plug-in groove, so that the measuring tube and the connecting pipe are snap-fitted and connected. This method is simple to operate and convenient for installation and disassembly. At the same time, by separating the soft metal plate from the extension plate and then passing through the sealing plate, it is easy to move the pressure regulating seat out of the inside of the measuring tube, thereby performing disassembly and maintenance, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting pipe of the present invention;

[0023] Figure 5 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the limiting ring seat of the present invention;

[0025] Figure 7 For the present invention Figure 2 The enlarged structural diagram at C in the middle;

[0026] Figure 8 It is a rear view structural schematic diagram of the present invention.

[0027] In the figure: 1. measuring tube; 101. convex block; 102. plug-in socket; 2. connecting pipe; 201. plug-in slot; 202. engaging circular slot; 3. positioning piece; 301. positioning ring seat; 302. plug-in rod; 4. mounting flange; 5. filtering mechanism; 501. mounting base; 502. filter screen; 503. cleaning brush; 504. sealing member; 505. supporting frame; 506. electric hydraulic rod; 507. limiting ring seat; 508. positioning plate; 509. moisture-absorbing cotton; 6. pressure regulating mechanism; 601. pressure regulating seat; 602. solenoid valve; 603. ventilation hole; 604. connecting seat; 605. positioning frame; 606. sealing plate; 607. sealing sleeve; 608. extension plate; 609. soft metal plate; 7. flow detection display screen; 8. flow detection head; 9. mounting cylinder; 10. pressure detector. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-8 The present invention provides a technical solution: a high-precision fluid measuring device that effectively measures gas flow, according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, both ends of the measuring tube 1 are snap-connected with the corresponding connecting tube 2 through the positioning member 3, and the connecting tube 2 is symmetrically provided with a plug-in groove 201 on the inner side near one end of the measuring tube 1, and the two plug-in grooves 201 are connected through a snap-in circular groove 202 away from one end of the measuring tube 1, and at the same time, the symmetrically arranged protrusion 101 at one end of the measuring tube 1 is slidably connected with the plug-in groove 201 and the snap-in circular groove 202, the positioning member 3 includes a positioning ring seat 301 and a plug-in rod 302, and the positioning ring seat 301 is sleeved on the outer side of one end of the measuring tube 1, and at the same time, the positioning ring seat 301 is symmetrically provided with a plug-in rod 302 on one side near the connecting tube 2, the two plug-in rods 302 respectively pass through the corresponding plug-in grooves 201 and extend to the inside of the snap-in circular groove 202, and the outer ends of the two connecting tubes 2 are provided with mounting flanges 4.

[0030] When in use, the symmetrically arranged protrusions 101 at both ends of the measuring tube 1 are inserted into the plug-in grooves 201 symmetrically opened on one side of the connecting tube 2 until the protrusions 101 are located inside the engaging circular grooves 202, and then the connecting tube 2 is rotated so that the protrusions 101 are located inside the other two sides of the engaging circular grooves 202, and then the positioning ring seat 301 is rotated so that the position of the plug-in rod 302 is set corresponding to the position of the plug-in groove 201, and then the positioning ring seat 301 is moved so that the plug-in rod 302 is inserted into the plug-in groove 201 and contacts with the inside of the engaging circular groove 202, thereby completing the connection between the measuring tube 1 and the connecting tube 2, otherwise the measuring tube 1 and the connecting tube 2 are disassembled and separated.

[0031] To further explain, an air inlet and an exhaust port are respectively provided at both ends of the measuring tube 1, and one side of the air inlet is snap-connected with a connecting tube 2 equipped with a filtering mechanism 5, so that the gas is filtered and dehumidified by the filtering mechanism 5 before entering the measuring tube 1 through the air inlet for measurement, thereby effectively reducing the degree of damage to the flow detection head 8 caused by impurities and moisture in the gas and extending the service life of the flow detection head 8. At the same time, the sizes of the air inlet and the exhaust port are smaller than the middle inner diameter of the measuring tube 1.

[0032] according to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 8 As shown, a filter mechanism 5 is installed on the connecting pipe 2 set on one side, and the filter mechanism 5 includes a mounting base 501 and a filter screen plate 502, and the mounting base 501 is connected to the lower end of the connecting pipe 2 by fixing screws, and the filter screen plate 502 is installed on the inner side of the upper end of the mounting base 501, the top of the filter screen plate 502 passes through the bottom of the connecting pipe 2 and extends to the through hole opened at the upper end of the connecting pipe 2, and a sealing member 504 is arranged between the inside of the through hole and the upper end of the filter screen plate 502, a support frame 505 is arranged on the upper end of the filter screen plate 502 outside the through hole, and an electric hydraulic rod 506 is installed in the middle of the upper end of the support frame 505, and the output end of the electric hydraulic rod 506 is connected to the middle of the upper end of the filter screen plate 502, the filter screen plate 502 forms a movable structure with the connecting pipe 2 through the electric hydraulic rod 506, and cleaning brushes 503 are symmetrically arranged on both sides of the lower end of the filter screen plate 502, and the tops of the two cleaning brushes 503 pass through the connecting pipe 2 and extend to the upper end of the inside of the connecting pipe 2.

[0033] When in use, the filter screen 502 is used to filter impurities in the gas to ensure the cleanliness of the gas entering the measuring tube 1. When there are many impurities adhering to the filter screen 502, which affects the flow of gas, the electric hydraulic rod 506 is started to drive the filter screen 502 to move upward inside the connecting tube 2, so that the cleaning brushes 503 set on both sides of the filter screen 502 clean the filter screen 502, thereby improving the practicality of use.

[0034] Further explanation, the filter screen plate 502 is located on both sides of the connecting pipe 2 with symmetrical limit ring seats 507, and the outer walls of the two limit ring seats 507 are snap-connected with the inner wall of the connecting pipe 2, which is convenient for fixing and installing the limit ring seats 507 while also convenient for disassembly, thereby facilitating the replacement of the moisture-absorbing cotton 509 arranged inside the limit ring seats 507 to improve the moisture absorption effect. At the same time, the positioning plates 508 symmetrically arranged on the upper ends of the opposite sides of the two limit ring seats 507 are respectively connected to the tops of the corresponding cleaning brushes 503. The inner sides of the two limit ring seats 507 are provided with moisture-absorbing cotton 509, and the moisture-absorbing cotton 509 is a honeycomb structure. Through the moisture-absorbing cotton 509, it is convenient to continue to adsorb moisture in the gas, so that the gas entering the measuring tube 1 remains dry, and moisture is prevented from damaging the flow detection head 8. At the same time, when cleaning the filter screen plate 502, the moisture-absorbing cotton 509 is convenient to intercept impurities to prevent impurities from splashing and affecting the cleanliness of the inside of the connecting pipe 2.

[0035] according to Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, a pressure regulating mechanism 6 is arranged in the middle of the measuring tube 1, and a socket 102 is symmetrically installed on both sides of the upper end of the measuring tube 1 above the pressure regulating mechanism 6, and at the same time, the two sockets 102 are snap-connected with the lower ends of the correspondingly arranged mounting tubes 9, and the tops of the two mounting tubes 9 are connected with the lower ends of the flow detection display screen 7, and the lower ends of the flow detection display screen 7 are symmetrically provided with flow detection heads 8, the flow detection heads 8 are prior art, and their model is MF5708-G-100-BA, through the flow detection heads 8, it is convenient to detect the gas flow located on both sides of the pressure regulating mechanism 6, so as to improve the accuracy of the detection result, at the same time, the two flow detection heads 8 pass through the correspondingly arranged mounting tubes 9 and extend into the measuring tube 1, and a pressure detector 10 is symmetrically installed about the pressure regulating mechanism 6 on the rear side of the measuring tube 1, the pressure detector 10 is prior art, and its model is 510i / 549i, through the pressure detector 10, it is convenient to detect the gas pressure on both sides of the pressure regulating mechanism 6, and calculate the gas flow by the pressure difference, so as to improve the accuracy of the detection result.

[0036] Specifically, the pressure regulating mechanism 6 includes a pressure regulating seat 601, and a solenoid valve 602 is arranged inside the pressure regulating seat 601 near the air inlet side, and a plurality of ventilation holes 603 are opened inside the pressure regulating seat 601 near the exhaust port side, the ventilation holes 603 are funnel structures, and the diameter of the ventilation holes 603 near the solenoid valve 602 is larger than the diameter of the side away from the solenoid valve 602, a connecting seat 604 is arranged at the bottom of the lower end of the pressure regulating seat 601, and a sealing sleeve 607 is arranged outside the connecting seat 604, and the connecting seat 604 penetrates the measuring tube 1 and the positioning frame 605 and is connected to the sealing plate 606, and soft metal plates 609 are symmetrically arranged on both sides of the upper end of the sealing plate 606, and the soft metal plates 60 9 The upper end penetrates the fixed extension plate 608 corresponding to the side of the positioning frame 605, and the top of the soft metal plate 609 is connected to the outer side of the fixed extension plate 608 by snapping. By separating the soft metal plate 609 from the fixed extension plate 608, the sealing plate 606 is separated from the bottom of the positioning frame 605, and then the sealing plate 606 is pulled, so that the sealing plate 606 drives the connecting seat 604, the sealing sleeve 607 and the pressure regulating seat 601 to move downward, and the pressure regulating seat 601 is separated from the measuring tube 1, so as to facilitate the inspection, maintenance and cleaning of the solenoid valve 602 and the ventilation hole 603 provided inside the pressure regulating seat 601. Otherwise, the pressure regulating seat 601 is installed to improve the practicality during use.

[0037] When in use, by opening the solenoid valve 602, the gas is discharged through the solenoid valve 602 and the ventilation hole 603, so that the gas pressure on both sides of the pressure regulating seat 601 is different, and then the corresponding positions are detected respectively through the two pressure detectors 10, so as to calculate the gas flow rate according to the pressure difference between the two air pressures, and the flow detection head 8 is opened so that the flow detection head 8 detects the gas flow rate at the corresponding position, and then the detection result is compared with the calculated gas flow result, so as to obtain more accurate data and improve the precision and accuracy of the detection result.

[0038] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision fluid measuring device for effectively measuring gas flow, comprising a measuring tube (1), characterized in that: The two ends of the measuring tube (1) are connected to the corresponding connecting tubes (2) by means of positioning members (3), and the outer ends of the two connecting tubes (2) are both provided with mounting flanges (4), and a filtering mechanism (5) is installed on the connecting tube (2) provided on one side, and the filtering mechanism (5) comprises a mounting base (501) and a filtering screen plate (502), and the mounting base (501) is connected to the lower end of the connecting tube (2) by means of fixing screws, and a filtering screen plate (502) is installed on the inner side of the upper end of the mounting base (501), and the top of the filtering screen plate (502) passes through the bottom of the connecting tube (2) and extends to a through hole provided at the upper end of the connecting tube (2), and a sealing member (504) is provided between the inside of the through hole and the upper end of the filtering screen plate (502); A pressure regulating mechanism (6) is arranged in the middle of the measuring tube (1), and sockets (102) are symmetrically arranged on both sides of the upper end of the measuring tube (1) above the pressure regulating mechanism (6), and the two sockets (102) are snap-connected with the lower ends of the correspondingly arranged installation tubes (9), the tops of the two installation tubes (9) are connected with the lower ends of the flow detection display screen (7), and the lower ends of the flow detection display screen (7) are symmetrically arranged with flow detection heads (8), and the two flow detection heads (8) penetrate the correspondingly arranged installation tubes (9) and extend into the interior of the measuring tube (1), and a pressure detector (10) is symmetrically arranged on the rear side of the measuring tube (1) with respect to the pressure regulating mechanism (6).

2. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: An air inlet and an air outlet are respectively provided at both ends of the measuring tube (1), and one side of the air inlet is snap-connected to a connecting tube (2) equipped with a filter mechanism (5), while the sizes of the air inlet and the air outlet are smaller than the middle inner diameter of the measuring tube (1).

3. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: The connecting tube (2) has a plugging groove (201) symmetrically formed on the inner side of one end close to the measuring tube (1), and the two plugging grooves (201) are connected via a snap-fit ​​circular groove (202) at one end away from the measuring tube (1), while a symmetrically arranged protrusion (101) at one end of the measuring tube (1) is slidably connected to the plugging groove (201) and the snap-fit ​​circular groove (202).

4. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: The positioning member (3) comprises a positioning ring seat (301) and a plug-in rod (302), and the positioning ring seat (301) is sleeved on the outside of one end of the measuring tube (1), and the plug-in rod (302) is symmetrically arranged on one side of the positioning ring seat (301) close to the connecting tube (2), and the two plug-in rods (302) respectively pass through correspondingly arranged plug-in grooves (201) and extend into the interior of the engaging circular groove (202).

5. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: The upper end of the filter screen plate (502) is provided with a support frame (505) outside the through hole, and an electric hydraulic rod (506) is installed in the middle of the upper end of the support frame (505), and the output end of the electric hydraulic rod (506) is connected to the middle of the upper end of the filter screen plate (502). The filter screen plate (502) and the connecting pipe (2) form a movable structure through the electric hydraulic rod (506), and cleaning brushes (503) are symmetrically arranged on both sides of the lower end of the filter screen plate (502), and the tops of the two cleaning brushes (503) pass through the connecting pipe (2) and extend to the upper end of the inner part of the connecting pipe (2).

6. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: The filter screen plate (502) is located inside the connecting tube (2) and has symmetrically arranged limit ring seats (507) on both sides thereof, and the outer walls of the two limit ring seats (507) are snap-fitted and connected to the inner wall of the connecting tube (2). At the same time, positioning plates (508) symmetrically arranged on the upper ends of the two limit ring seats (507) on opposite sides are respectively connected to the tops of the corresponding cleaning brushes (503). Moisture-absorbing cotton (509) is arranged on the inner sides of the two limit ring seats (507), and the moisture-absorbing cotton (509) is a honeycomb structure.

7. The high-precision fluid measuring device for effectively measuring gas flow as claimed in claim 1, characterized in that: The pressure regulating mechanism (6) comprises a pressure regulating seat (601), and a solenoid valve (602) is arranged inside the pressure regulating seat (601) on the side close to the air inlet, and a plurality of ventilation holes (603) are opened inside the pressure regulating seat (601) on the side close to the air outlet. A connecting seat (604) is arranged at the bottom of the lower end of the pressure regulating seat (601), and a sealing sleeve (607) is arranged on the outer side of the connecting seat (604). The connecting seat (604) penetrates the measuring tube (1) and the positioning frame (605) and is connected to the sealing plate (606). Soft metal plates (609) are symmetrically arranged on both sides of the upper end of the sealing plate (606), and the upper end of the soft metal plate (609) penetrates the fixed extension plate (608) correspondingly arranged on the side of the positioning frame (605), and the top of the soft metal plate (609) is snap-fitted to the outer side of the fixed extension plate (608).

8. The high-precision fluid measuring device for effectively measuring gas flow rate according to claim 7, characterized in that: The ventilation hole (603) is a funnel structure, and the diameter of the ventilation hole (603) on the side close to the electromagnetic valve (602) is larger than the diameter of the side away from the electromagnetic valve (602).

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