A multi-orifice orifice flowmeter

Abstract

This invention relates to the field of flow monitoring technology, specifically a multi-orifice plate flow meter, comprising a flange, a main structure, an adjustment structure, a backflushing structure, a display structure, a sealing structure, and a straight pipe. The adjustment structure alters the overlap between the through-holes of the adjustment orifice plate and the orifice plate body, thereby flexibly adjusting the effective flow area of ​​the through-holes to achieve accurate measurement of different flow ranges and improve the flow meter's applicability. The backflushing structure reverses the flushing of the through-holes on the orifice plate body, removing attached impurities, effectively preventing blockage, ensuring measurement accuracy, and reducing manual maintenance costs and downtime. The display structure visually shows the rotation angle of the adjustment orifice plate, reflecting the flow area adjustment status of the through-holes, allowing operators to accurately monitor the flow meter's operation. The sealing air bladder in the sealing structure, after inflation, further enhances the sealing effect at the upper and lower connecting grooves, effectively preventing fluid leakage.

Description

Technical Field

[0001] This invention relates to the field of flow monitoring technology, specifically a multi-orifice plate flow meter. Background Technology

[0002] Flow measurement is a crucial step in industrial production. Orifice plate flow meters are widely used due to their simple structure and low cost. Multi-orifice plate flow meters are a common type of orifice plate flow meter, widely used in industries such as petroleum, chemical, metallurgy, power, natural gas, water treatment, pharmaceutical, papermaking, and printing and dyeing. They can be used to measure the flow of various fluids, such as steam, air, water, and oil, and are particularly suitable for applications requiring high precision and long-term stable measurement.

[0003] However, current multi-orifice plate flow meters have fixed orifice diameters, making it impossible to flexibly adjust the flow measurement range according to actual operating conditions. When the fluid flow rate changes significantly, it is necessary to frequently replace orifice plates of different specifications, which is cumbersome and costly. When measuring fluids containing impurities, the orifice holes of current multi-orifice plate flow meters are easily blocked by impurities, leading to a decrease in measurement accuracy and even affecting the normal operation of the equipment. Moreover, most existing orifice plate flow meters lack an effective self-cleaning mechanism and require manual disassembly and cleaning periodically, which undoubtedly increases maintenance costs and downtime. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a multi-orifice plate flow meter.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a multi-orifice plate flow meter, comprising two flanges, a main structure disposed on the two flanges, an adjustment structure disposed on the downstream flange, a backflushing structure disposed on the adjustment structure, a display structure disposed on the downstream flange, a sealing structure disposed on the backflushing structure, and a straight pipe welded to the flanges;

[0006] The main structure includes two pressure guiding pipes and an orifice plate body. Each of the flanges is equipped with a pressure guiding pipe, and the orifice plate body is installed between the two flanges. The orifice plate body has a first central hole at its center and four first side holes arranged in a circular array on its circumference.

[0007] The adjusting structure includes an adjusting orifice plate and a worm gear. The adjusting orifice plate is rotatably connected to the flange. The adjusting orifice plate has a second central hole at its center and four second side holes arranged in a circumferential array on the adjusting orifice plate. The worm gear with an L-shaped cross-section is fixedly connected to the adjusting orifice plate and is rotatably connected to the flange. The flange and the orifice plate body are provided with a second sealing groove. A second sealing ring is provided inside the second sealing groove. The adjusting orifice plate abuts against the second sealing ring. A worm is rotatably connected to the flange and meshes with the worm gear.

[0008] Specifically, the diameter of the second side hole is equal to the diameter of the first side hole, and the diameter of the first center hole is equal to the diameter of the second center hole.

[0009] Specifically, a three-valve assembly is fixedly connected to the top of the two pressure-conducting pipes, and a differential pressure gauge is installed at the top of the three-valve assembly.

[0010] Specifically, the flange is provided with a first sealing groove, and a first sealing ring is provided inside the first sealing groove. The orifice plate body abuts against the two first sealing rings.

[0011] Specifically, the display structure includes a slide groove and a connecting rod. The flange is provided with an arc-shaped slide groove, the connecting rod is fixedly connected to the worm gear, the connecting rod is slidably connected to the slide groove, a scale ring is fixedly connected to the flange, and a display block that cooperates with the scale ring is fixedly connected to the connecting rod.

[0012] Specifically, the backflush structure includes mounting slots and an air ring. The adjusting orifice plate has five mounting slots, and an air ring is fixedly connected inside each mounting slot. Multiple nozzles are arranged in a circumferential array on the air ring, and an insertion tube is fixedly connected to the air ring. An air chamber is located inside the adjusting orifice plate, and the insertion tube communicates with the air chamber. A first flow channel is provided on the adjusting orifice plate, and a lower connecting slot is located along the edge of the adjusting orifice plate, communicating with the air chamber through the first flow channel. An upper connecting slot is provided on the flange, and a first connecting pipe is fixedly connected to the flange. A second flow channel is located inside the flange, and the upper connecting slot communicates with the first connecting pipe through the second flow channel. A support plate is fixedly connected to the flange, and an air pump is fixedly connected to the support plate. A first solenoid valve is fixedly connected to the support plate, and the first connecting pipe is fixedly connected to the first solenoid valve. A first air outlet pipe is fixedly connected between the first solenoid valve and the air pump.

[0013] Specifically, the cross-section of the insertion tube is a cross shape, and a sealing gasket is fixedly connected to one side of the insertion tube, with the sealing gasket abutting against the adjustment orifice plate.

[0014] Specifically, the cross-sectional end of the air ring is trapezoidal, and the nozzle is equipped with a one-way valve inside.

[0015] Specifically, the sealing structure includes a second vent pipe and a second solenoid valve. The second solenoid valve is fixedly connected to the support plate. An annular sealing airbag is provided inside the upper groove. A drain pipe is provided inside the flange. A second connecting pipe is fixedly connected to one side of the flange. The drain pipe communicates with the second connecting pipe.

[0016] Specifically, a second air outlet pipe is fixedly connected between the second solenoid valve and the air pump, and the second connecting pipe is fixedly connected to the second solenoid valve.

[0017] The beneficial effects of this invention are:

[0018] (1) The multi-hole plate flow meter of the present invention has an adjustment structure on the flange. By adjusting the adjustment structure, the overlap between the through hole of the adjustment orifice plate and the orifice plate body is changed, thereby flexibly adjusting the effective flow area of ​​the through hole, realizing accurate measurement of different flow ranges, improving the applicability of the flow meter, and avoiding the tedious operation of frequently replacing the orifice plate.

[0019] (2) The multi-hole plate flow meter of the present invention has a backflushing structure on the adjustment structure. The backflushing structure flushes the through holes on the orifice plate body in the reverse direction to remove the attached impurities, effectively prevent the through holes from being blocked, ensure measurement accuracy, and reduce manual maintenance costs and downtime.

[0020] (3) The multi-hole plate flow meter of the present invention has a display structure on the flange. The rotation angle of the adjustment orifice plate can be displayed intuitively through the display structure, thereby reflecting the flow area adjustment status of the through hole, which makes it easy for the operator to accurately grasp the working status of the flow meter.

[0021] (4) The multi-hole plate flow meter of the present invention has a sealing structure on the backflushing structure. The sealing air bladder in the sealing structure can further enhance the sealing effect at the upper and lower connecting grooves after inflation, effectively preventing fluid leakage and ensuring the stable operation of the flow meter. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of a multi-hole plate flowmeter provided by the present invention;

[0024] Figure 2 This is a schematic diagram of the connection structure between the flange and the orifice plate body of the present invention;

[0025] Figure 3 for Figure 2 The diagram shown is an enlarged view of the structure of part A.

[0026] Figure 4 This is a schematic diagram of the connection structure between the three-valve manifold and the differential pressure gauge of the present invention;

[0027] Figure 5 for Figure 4 The diagram shown is an enlarged view of the structure of section B.

[0028] Figure 6 This is a schematic diagram of the connection structure between the flange and the graduated ring of the present invention;

[0029] Figure 7This is a schematic diagram of the connection structure between the flange and the adjusting orifice plate of the present invention;

[0030] Figure 8 for Figure 7 The diagram shows an enlarged view of section C.

[0031] Figure 9 for Figure 7 The diagram shown is an enlarged view of the structure of part D.

[0032] Figure 10 This is a schematic diagram of the connection structure between the orifice plate body and the adjusting orifice plate of the present invention;

[0033] Figure 11 for Figure 10 The diagram shown is an enlarged view of the structure of part E.

[0034] Figure 12 This is an exploded view of the flange and orifice plate body of the present invention;

[0035] Figure 13 This is a schematic diagram of the connection structure between the adjusting orifice plate and the lower groove of the present invention;

[0036] Figure 14 This is a schematic diagram of the connection structure between the adjusting orifice plate and the worm gear of the present invention;

[0037] Figure 15 for Figure 14 The diagram shows an enlarged view of the F-section structure.

[0038] Figure 16 This is a schematic diagram of the connection structure between the regulating orifice plate and the air chamber of the present invention;

[0039] Figure 17 for Figure 16 The diagram shows an enlarged view of the G section structure.

[0040] In the diagram: 1. Flange; 2. Main structure; 201. Pressure guide pipe; 202. Orifice plate body; 203. Three-valve manifold; 204. Differential pressure gauge; 205. First central hole; 206. First side hole; 207. First sealing groove; 208. First sealing ring; 3. Adjustment structure; 301. Adjusting orifice plate; 302. Worm gear; 303. Second sealing groove; 304. Second sealing ring; 305. Second central hole; 306. Second side hole; 307. Worm; 4. Backflush structure; 401. Mounting groove; 402. Air ring; 403. Nozzle; 404. Insert pipe; 405. 406. Sealing gasket; 407. Air chamber; 408. First drainage channel; 409. Lower connecting groove; 410. One-way valve; 411. Upper connecting groove; 412. Second drainage channel; 413. Support plate; 414. Air pump; 415. First solenoid valve; 416. First air outlet pipe; 5. Display structure; 501. Slide groove; 502. Connecting rod; 503. Display block; 504. Scale ring; 6. Sealing structure; 601. Second air outlet pipe; 602. Second solenoid valve; 603. Second connecting pipe; 604. Drainage pipe; 605. Sealing airbag; 7. Straight pipe. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 16 and Figure 17 As shown, the multi-orifice plate flowmeter of the present invention includes two flanges 1, a main structure 2 disposed on the two flanges 1, an adjustment structure 3 disposed on the downstream flange 1, a backflushing structure 4 disposed on the adjustment structure 3, a display structure 5 disposed on the downstream flange 1, a sealing structure 6 disposed on the backflushing structure 4, and a straight pipe 7 welded to the flange 1.

[0043] The main structure 2 includes two pressure guiding pipes 201 and an orifice plate body 202. Each of the flanges 1 is equipped with a pressure guiding pipe 201. An orifice plate body 202 is installed between the two flanges 1. A first central hole 205 is provided at the center of the orifice plate body 202. Four first side holes 206 are arranged in a circular array on the orifice plate body 202.

[0044] The adjusting structure 3 includes an adjusting orifice plate 301 and a worm gear 302. The adjusting orifice plate 301 is rotatably connected to the flange 1. The adjusting orifice plate 301 has a second central hole 305 at its center and four second side holes 306 arranged in a circumferential array on its surface. The worm gear 302 with an L-shaped cross-section is fixedly connected to the adjusting orifice plate 301 and is rotatably connected to the flange 1. The flange 1 and the orifice plate body 202 are provided with a second sealing groove 303. A second sealing ring 304 is provided inside the second sealing groove 303, and the adjusting orifice plate 301 abuts against the second sealing ring 304. A worm 307 is rotatably connected to the flange 1 and meshes with the worm gear 302. When it is necessary to adjust the flow measurement range, the worm 307 is rotated, and the worm 307 meshes with the worm gear 302. The worm gear 302 is fixed to the adjusting orifice plate 301, causing the adjusting orifice plate 301 to rotate relative to the orifice plate body 202. Since the second center hole 305 and the second side hole 306 on the adjusting orifice plate 301 have the same diameter as the first center hole 205 and the first side hole 206 on the orifice plate body 202, and are all distributed in a circular array, the rotation of the adjusting orifice plate 301 changes the overlap of the holes on the two layers of orifice plates, thereby adjusting the effective flow area of ​​the through hole. For example, when the adjusting orifice plate 301 rotates until the second side hole 306 and the first side hole 206 also completely overlap, the effective flow area of ​​the through hole is the largest, which is suitable for large flow measurement; when the adjusting orifice plate 301 rotates at a certain angle, causing the holes on the two layers of orifice plates to partially overlap, the effective flow area decreases, which is suitable for small flow measurement, thus improving the applicability of the device.

[0045] The diameter of the second side hole 306 is equal to the diameter of the first side hole 206, and the diameter of the first center hole 205 is equal to the diameter of the second center hole 305. A three-valve assembly 203 is fixedly connected to the top ends of the two pressure-conducting pipes 201, and a differential pressure gauge 204 is installed at the top end of the three-valve assembly 203. When fluid flows through the orifice plate body 202, a pressure difference is generated before and after the orifice plate body 202. The two pressure-conducting pipes 201 transmit this pressure difference to the three-valve assembly 203, which then transmits it to the differential pressure gauge 204. The differential pressure gauge 204 displays the pressure difference value, and the operator can calculate the fluid flow rate based on the pressure difference value. The flange 1 is provided with a first sealing groove 207, and the first sealing groove 207 is provided with a first sealing ring 208. The orifice plate body 202 abuts against the two first sealing rings 208. To install the flow meter, the two flanges 1 are bolted to the fluid pipeline that needs to measure the flow rate. The straight pipe 7 on the flange 1 is welded to the fluid pipeline to ensure a firm and sealed connection. The flange 1 with the adjustment structure 3 is connected to the downstream pipeline. The orifice plate body 202 is installed between the two flanges 1 and the sealing is achieved by the first sealing ring 208 in the first sealing groove 207 to prevent fluid leakage.

[0046] Specifically, such as Figure 3 , Figure 5 , Figure 11 , Figure 12 and Figure 13 As shown, the display structure 5 includes a sliding groove 501 and a connecting rod 502. The flange 1 is provided with an arc-shaped sliding groove 501. The connecting rod 502 is fixedly connected to the worm gear 302. The connecting rod 502 is slidably connected to the sliding groove 501. A scale ring 504 is fixedly connected to the flange 1. A display block 503 that cooperates with the scale ring 504 is fixedly connected to the connecting rod 502. During the rotation of the adjusting orifice plate 301, the worm gear 302 drives the connecting rod 502 to slide in the sliding groove 501 on the flange 1. The display block 503 on the connecting rod 502 moves on the scale ring 504. The operator can intuitively understand the rotation angle of the adjusting orifice plate 301 through the position of the display block 503 on the scale ring 504, thereby accurately grasping the flow area adjustment status of the through hole.

[0047] Specifically, such as Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17As shown, the backflush structure 4 includes mounting grooves 401 and an air ring 402. The adjusting orifice plate 301 has five mounting grooves 401. An air ring 402 is fixedly connected inside each mounting groove 401. Multiple nozzles 403 are arranged in a circumferential array on the air ring 402. An insertion tube 404 is fixedly connected to the air ring 402. An air chamber 406 is located inside the adjusting orifice plate 301. The insertion tube 404 communicates with the air chamber 406. A first flow channel 407 is provided on the adjusting orifice plate 301. A lower connecting groove 408 is provided along the edge of the adjusting orifice plate 301. The lower connecting groove 408 communicates with the air chamber 406 through the first flow channel 407. An upper connecting groove 410 is provided on the flange 1. A first connecting pipe 415 is fixedly connected to the flange 1. A second drainage channel 411 is provided inside the flange 1. The upper connecting groove 410 communicates with the first connecting pipe 415 through the second drainage channel 411. A support plate 412 is fixedly connected to the flange 1. An air pump 413 is fixedly connected to the support plate 412. A first solenoid valve 414 is fixedly connected to the support plate 412. The first connecting pipe 415 is fixedly connected to the first solenoid valve 414. A first air outlet pipe 416 is fixedly connected between the first solenoid valve 414 and the air pump 413. The cross-section of the insertion tube 404 is a cross-shaped structure. A sealing gasket 405 is fixedly connected to one side of the insertion tube 404. The sealing gasket 405 abuts against the adjusting orifice plate 301; the cross-sectional end of the air ring 402 is trapezoidal, and the nozzle 403 is equipped with a one-way valve 409 inside; when it is necessary to backflushing and cleaning the through hole, firstly, the adjusting orifice plate 301 is rotated by the adjusting structure 3 so that the first side hole 206 and the second side hole 306 completely overlap. At this time, the air ring 402 inside the mounting groove 401 corresponds to the position of the first side hole 206, and the upper connecting groove 410 and the lower connecting groove 408 are completely corresponding. Then, the air pump 413 is adjusted and started, and the upper connecting groove 410 and the lower connecting groove 408 are sealed by the sealing structure 6. At the same time, the first solenoid valve 414 is opened, and the high-pressure gas generated by the air pump 413 passes through the first air outlet pipe 416 and the first solenoid valve 414. The solenoid valve 414 enters the first connecting pipe 415, and then enters the upper connecting groove 410 through the second guide channel 411 inside the flange 1. Since the lower connecting groove 408 on the regulating orifice plate 301 is connected to the upper connecting groove 410, the high-pressure gas enters the gas chamber 406 inside the regulating orifice plate 301 through the lower connecting groove 408 and the first guide channel 407, and then enters the gas ring 402 through the insertion pipe 404. The nozzles 403 in the circumferential array on the gas ring 402 spray out the high-pressure gas to backwash the through hole and remove the impurities attached to the inner wall of the through hole. The one-way valve 409 inside the nozzle 403 ensures that the high-pressure gas can only be sprayed out from the nozzle 403 towards the through hole, preventing the fluid in the pipeline from flowing out from the nozzle 403 after the backwash is completed.

[0048] Specifically, such as Figure 3 , Figure 5 , Figure 9 and Figure 17As shown, the sealing structure 6 includes a second vent pipe 601 and a second solenoid valve 602. The second solenoid valve 602 is fixedly connected to the support plate 412. An annular sealing airbag 605 is provided inside the upper receiving groove 410. A drain pipe 604 is provided inside the flange 1. A second connecting pipe 603 is fixedly connected to one side of the flange 1. The drain pipe 604 communicates with the second connecting pipe 603. The second vent pipe 601 is fixedly connected between the second solenoid valve 602 and the air pump 413. The second connecting pipe 603 is fixedly connected to the second solenoid valve 602. Before the backflushing structure 4 is working, the second solenoid valve 602 is opened simultaneously. The high-pressure gas generated by the air pump 413 enters the second connecting pipe 603 through the second vent pipe 601 and the second solenoid valve 602, and then enters the sealing airbag 605 inside the upper receiving groove 410 through the drain pipe 604. The sealing airbag 605 is inflated and expanded, further enhancing the sealing effect at the upper receiving groove 410, preventing high-pressure gas leakage, and ensuring the backflushing effect.

[0049] In use, the flow meter is first installed by bolting two flanges 1 onto the fluid pipeline to be measured. The straight pipe 7 on the flange 1 is welded to the fluid pipeline to ensure a firm and sealed connection. The flange 1 with the adjustment structure 3 is connected to the downstream pipeline. The orifice plate body 202 is installed between the two flanges 1 and the sealing is achieved by the first sealing ring 208 in the first sealing groove 207 to prevent fluid leakage.

[0050] Then, when it is necessary to adjust the flow measurement range, the worm 307 is rotated, and the worm 307 meshes with the worm wheel 302, driving the worm wheel 302 to rotate. The worm wheel 302 is fixed on the adjusting orifice plate 301, thereby causing the adjusting orifice plate 301 to rotate relative to the orifice plate body 202. Since the second center hole 305 and the second side hole 306 on the adjusting orifice plate 301 have the same diameter as the first center hole 205 and the first side hole 206 on the orifice plate body 202, and are all distributed in a circular array, the rotation of the adjusting orifice plate 301 changes the overlap of the holes on the two layers of orifice plates, thereby adjusting the effective flow area of ​​the through hole. For example, when the adjusting orifice plate 301 is rotated until the second side hole 306 and the first side hole 206 also completely overlap, the effective flow area of ​​the through hole is the largest, which is suitable for large flow measurement; when the adjusting orifice plate 301 is rotated at a certain angle, so that the holes on the two layers of orifice plates partially overlap, the effective flow area is reduced, which is suitable for small flow measurement, thus improving the applicability of the device.

[0051] Meanwhile, during the rotation of the orifice plate 301, the worm gear 302 drives the connecting rod 502 to slide in the groove 501 on the flange 1. The display block 503 on the connecting rod 502 moves on the scale ring 504. The operator can intuitively understand the rotation angle of the orifice plate 301 by observing the position of the display block 503 on the scale ring 504, thereby accurately grasping the flow area adjustment status of the through hole. When the fluid flows through the orifice plate body 202, a pressure difference is generated before and after the orifice plate body 202. The two pressure guide pipes 201 transmit the pressure difference to the three-valve group 203, and then transmit it to the differential pressure gauge 204 through the three-valve group 203. The differential pressure gauge 204 displays the pressure difference value, and the operator can calculate the flow rate of the fluid based on the pressure difference value.

[0052] Secondly, when backflushing and cleaning the through hole is required, first rotate the adjusting orifice plate 301 by adjusting the adjusting structure 3 so that the first side hole 206 and the second side hole 306 completely overlap. At this time, the air ring 402 inside the mounting groove 401 corresponds to the position of the first side hole 206, and the upper connecting groove 410 corresponds to the position of the lower connecting groove 408. Then, adjust and start the air pump 413, and seal the upper connecting groove 410 and the lower connecting groove 408 through the sealing structure 6. At the same time, open the first solenoid valve 414. The high-pressure gas generated by the air pump 413 enters the first connecting pipe 415 through the first air outlet pipe 416 and the first solenoid valve 414, and then passes through the flange 1. The second drainage channel 411 of the part enters the upper receiving groove 410. Since the lower receiving groove 408 on the regulating orifice plate 301 is connected to the upper receiving groove 410, the high pressure gas enters the air chamber 406 inside the regulating orifice plate 301 through the lower receiving groove 408 and the first drainage channel 407, and then enters the air ring 402 through the insertion tube 404. The nozzles 403 in the circumferential array on the air ring 402 spray out the high pressure gas to back flush the through hole and remove the impurities attached to the inner wall of the through hole. The one-way valve 409 inside the nozzle 403 ensures that the high pressure gas can only be sprayed out from the nozzle 403 towards the through hole, preventing the fluid in the pipeline from flowing out from the nozzle 403 after the back flushing is completed.

[0053] Finally, before the backflush structure 4 starts working, the second solenoid valve 602 is opened simultaneously. The high-pressure gas generated by the air pump 413 enters the second connecting pipe 603 through the second air outlet pipe 601 and the second solenoid valve 602, and then enters the sealing airbag 605 inside the upper receiving groove 410 through the drainage pipe 604. The sealing airbag 605 is inflated and expanded, further enhancing the sealing effect at the upper receiving groove 410, preventing high-pressure gas leakage, and ensuring the backflush effect.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-orifice plate flow meter, characterized in that, It includes two flanges (1), a main structure (2) provided on the two flanges (1), an adjustment structure (3) provided on the downstream flange (1), a backflushing structure (4) provided on the adjustment structure (3), a display structure (5) provided on the downstream flange (1), a sealing structure (6) provided on the backflushing structure (4), and a straight pipe (7) welded to the flange (1). The main structure (2) includes two pressure guiding pipes (201) and an orifice plate body (202). Each of the flanges (1) is equipped with a pressure guiding pipe (201). An orifice plate body (202) is installed between the two flanges (1). A first central hole (205) is provided at the center of the orifice plate body (202). Four first side holes (206) are arranged in a circular array on the orifice plate body (202). The adjustment structure (3) includes an adjustment orifice plate (301) and a worm gear (302). The adjustment orifice plate (301) is rotatably connected to the flange (1). The center of the adjustment orifice plate (301) is provided with a second central hole (305). The adjustment orifice plate (301) is provided with four second side holes (306) arranged in a circular array. The worm gear (302) with an L-shaped cross section is fixedly connected to the adjustment orifice plate (301). The worm gear (302) is rotatably connected to the flange (1). The flange (1) and the orifice plate body (202) are provided with a second sealing groove (303). The interior of the second sealing groove (303) is provided with a second sealing ring (304). The adjustment orifice plate (301) abuts against the second sealing ring (304). The worm (307) is rotatably connected to the flange (1). The worm (307) meshes with the worm gear (302). The recoil structure (4) includes a mounting groove (401) and an air ring (402). The adjusting orifice plate (301) is provided with five mounting grooves (401). An air ring (402) is fixedly connected inside the mounting groove (401). Multiple nozzles (403) are arranged in a circumferential array on the air ring (402). An insertion tube (404) is fixedly connected to the air ring (402). An air chamber (406) is provided inside the adjusting orifice plate (301). The insertion tube (404) communicates with the air chamber (406). A first drainage channel (407) is provided on the adjusting orifice plate (301). A lower connecting groove (408) is provided on the edge of the adjusting orifice plate (301). The lower connecting groove (408) communicates with the air through the first drainage channel (407). The chamber (406) is connected, the flange (1) is provided with an upper groove (410), the flange (1) is fixedly connected with a first connecting pipe (415), the flange (1) is provided with a second drainage channel (411), the upper groove (410) is connected to the first connecting pipe (415) through the second drainage channel (411), the flange (1) is fixedly connected with a support plate (412), the support plate (412) is fixedly connected with an air pump (413), the support plate (412) is fixedly connected with a first solenoid valve (414), the first connecting pipe (415) is fixedly connected to the first solenoid valve (414), and the first solenoid valve (414) is fixedly connected to the air pump (413) with a first air outlet pipe (416).

2. The multi-orifice plate flow meter according to claim 1, characterized in that: The diameter of the second side hole (306) is equal to the diameter of the first side hole (206), and the diameter of the first center hole (205) is equal to the diameter of the second center hole (305).

3. The orifice plate flow meter according to claim 1, characterized in that: A three-valve assembly (203) is fixedly connected to the top end of the two pressure-conducting tubes (201), and a differential pressure gauge (204) is installed at the top end of the three-valve assembly (203).

4. The multi-orifice plate flow meter according to claim 1, characterized in that: The flange (1) is provided with a first sealing groove (207), and a first sealing ring (208) is provided inside the first sealing groove (207). The orifice plate body (202) abuts against the two first sealing rings (208).

5. A multi-orifice plate flowmeter according to claim 1, characterized in that: The display structure (5) includes a slide groove (501) and a connecting rod (502). The flange (1) is provided with an arc-shaped slide groove (501). The connecting rod (502) is fixedly connected to the worm gear (302). The connecting rod (502) is slidably connected to the slide groove (501). The flange (1) is fixedly connected with a scale ring (504). The connecting rod (502) is fixedly connected with a display block (503) that works in conjunction with the scale ring (504).

6. The orifice plate flow meter according to claim 1, characterized in that: The cross-section of the insertion tube (404) is a cross-shaped structure. A sealing gasket (405) is fixedly connected to one side of the insertion tube (404), and the sealing gasket (405) abuts against the adjustment orifice plate (301).

7. A multi-orifice plate flowmeter according to claim 1, characterized in that: The cross-section of the gas ring (402) is trapezoidal, and the nozzle (403) is equipped with a one-way valve (409).

8. A multi-orifice plate flowmeter according to claim 1, characterized in that: The sealing structure (6) includes a second vent pipe (601) and a second solenoid valve (602). The second solenoid valve (602) is fixedly connected to the support plate (412). The upper groove (410) is provided with an annular sealing airbag (605). The flange (1) is provided with a drain pipe (604). A second connecting pipe (603) is fixedly connected to one side of the flange (1). The drain pipe (604) is connected to the second connecting pipe (603).

9. A multi-orifice plate flowmeter according to claim 8, characterized in that: The second solenoid valve (602) is fixedly connected to the air pump (413) via a second air outlet pipe (601), and the second connecting pipe (603) is fixedly connected to the second solenoid valve (602).

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