Porous orifice plate flowmeter

Abstract

The invention relates to the technical field of flow monitoring, in particular to a porous orifice plate flowmeter which comprises a flange, a main body structure, an adjusting structure, a backflushing structure, a display structure, a sealing structure and a straight pipe. The overlapping degree of the through holes of the adjusting pore plate and the pore plate body is changed through the adjusting structure, so that the effective flow area of the through holes is flexibly adjusted, accurate measurement of different flow ranges is achieved, and the applicability of the flow meter is improved; the through holes in the pore plate body are reversely flushed through the backflushing structure, attached impurities are removed, the through holes are effectively prevented from being blocked, the measurement precision is guaranteed, and the manual maintenance cost and the downtime are reduced; the rotating angle of the adjusting hole plate can be visually displayed through the display structure, then the flow area adjusting state of the through hole is reflected, and an operator can conveniently and accurately master the working condition of the flowmeter; the sealing effect of the upper connecting groove and the lower connecting groove can be further enhanced after the sealing air bag in the sealing structure is inflated, and fluid leakage is effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of flow monitoring, in particular to a multi-hole orifice plate flowmeter. Background Art

[0002] In the industrial production process, flow measurement is a vital link. Orifice flowmeters are widely used due to their simple structure and low cost. Multi-hole orifice flowmeters are a common orifice flowmeter and are widely used in petroleum, chemical, metallurgy, electric power, natural gas, water treatment, pharmaceuticals, papermaking, printing and dyeing and other industries. They can be used to measure the flow of various fluids, such as steam, air, water, oil, etc., and are particularly suitable for occasions that require high-precision and long-term stable measurement.

[0003] However, the current multi-hole orifice plate flowmeter has a fixed aperture and cannot flexibly adjust the flow measurement range according to actual working conditions. When the fluid flow changes greatly, orifice plates of different specifications need to be frequently replaced, which is cumbersome and costly. When the current multi-hole orifice plate flowmeter measures fluids containing impurities, the through holes of the orifice plate are easily clogged by impurities, resulting in a decrease in measurement accuracy and even affecting the normal operation of the equipment. Most existing orifice plate flowmeters lack an effective self-cleaning mechanism and require manual disassembly and cleaning on a regular basis, which undoubtedly increases maintenance costs and downtime. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a multi-hole orifice plate flowmeter.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a multi-hole orifice plate flowmeter, comprising two flanges, a main structure provided on the two flanges, an adjustment structure provided on the downstream flange, a backflushing structure provided on the adjustment structure, a display structure provided on the downstream flange, a sealing structure provided on the backflushing structure, and a straight pipe welded to the flanges; The main structure includes two pressure-guiding tubes and an orifice plate body, each flange is equipped with a pressure-guiding tube, and an orifice plate body is installed between the two flanges. A first center hole is provided at the center of the orifice plate body, and four first side holes are provided in a circumferential array on the orifice plate body; The adjustment structure includes an adjustment orifice plate and a worm gear. The adjustment orifice plate is rotatably connected to the flange. A second center hole is provided at the center of the adjustment orifice plate. Four second side holes are provided in a circumferential array on the adjustment orifice plate. A worm gear with an L-shaped cross-section is fixedly connected to the adjustment orifice plate. The worm gear is rotatably connected to the flange. A second sealing groove is provided on the flange and the orifice plate body. A second sealing ring is provided inside the second sealing groove. The adjustment orifice plate is in conflict with the second sealing ring. A worm is rotatably connected to the flange, and the worm is engaged with the worm gear.

[0006] 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 side hole.

[0007] Specifically, the top ends of the two pressure guiding pipes are fixedly connected with a three-valve group, and the top end of the three-valve group is installed with a differential pressure gauge.

[0008] Specifically, a first sealing groove is provided on the flange, a first sealing ring is provided inside the first sealing groove, and the orifice plate body contacts the two first sealing rings.

[0009] Specifically, the display structure includes a slide groove and a connecting rod. The flange is provided with an arc-shaped slide groove. The worm gear is fixedly connected to a connecting rod. The connecting rod is slidably connected to the slide groove. The flange is fixedly connected to a scale ring. The connecting rod is fixedly connected to a display block used in conjunction with the scale ring.

[0010] The air filter press has a first end in contact with the air filter, and a second end in contact with the air filter press, and the second end in contact with the first filter press has a first end in contact with the first filter press, and the second end in contact with the first filter press has a second end in contact with the first filter press.

[0011] Specifically, the cross section of the insert is a "cross"-shaped structure, one side of the insert is fixedly connected with a sealing gasket, and the sealing gasket is in conflict with the regulating orifice plate.

[0012] Specifically, the cross-sectional end of the air ring is trapezoidal, and a one-way valve is provided inside the nozzle.

[0013] Specifically, the sealing structure includes a second air outlet 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 connecting groove. A drainage pipe is provided inside the flange. A second connecting pipe is fixedly connected to one side of the flange, and the drainage pipe is connected to the second connecting pipe.

[0014] 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.

[0015] The beneficial effects of the present invention are: (1) The multi-hole orifice plate flowmeter described in the present invention has an adjustment structure on the flange. The adjustment structure is used to change the overlap between the through hole of the adjustment orifice plate and the orifice plate body, thereby flexibly adjusting the effective flow area of ​​the through hole, achieving accurate measurement of different flow ranges, improving the applicability of the flowmeter, and avoiding the tedious operation of frequently replacing the orifice plate.

[0016] (2) The multi-hole orifice plate flowmeter described in the present invention has a backflushing structure on the regulating structure, which reversely flushes the through holes on the orifice plate body to remove attached impurities, effectively prevent the through holes from being blocked, ensure measurement accuracy, and reduce manual maintenance costs and downtime.

[0017] (3) The multi-hole orifice plate flowmeter described in the present invention has a display structure on the flange, which can intuitively display the rotation angle of the adjustment orifice plate, thereby reflecting the adjustment status of the flow area of ​​the through hole, so that the operator can accurately grasp the working status of the flowmeter.

[0018] (4) The porous orifice plate flowmeter described in the present invention has a sealing structure provided on the recoil structure. The sealing airbag in the sealing structure can further enhance the sealing effect between the upper connecting groove and the lower connecting groove after inflation, effectively preventing fluid leakage and ensuring the stable operation of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of a multi-hole orifice plate flowmeter provided by the present invention; Figure 2 This is a schematic diagram of the connection structure between the flange and the orifice plate body of the present invention; Figure 3 for Figure 2 An enlarged schematic diagram of the structure of section A is shown; Figure 4 This is a schematic diagram of the connection structure between the three-valve group and the differential pressure gauge of the present invention; Figure 5 for Figure 4 An enlarged schematic diagram of the structure of part B is shown; Figure 6 Schematic diagram of the connection structure between the flange and the scale ring of the present invention; Figure 7 Schematic diagram of the connection structure between the flange and the regulating orifice plate of the present invention; Figure 8 for Figure 7 The enlarged schematic diagram of the C-section structure is shown; Figure 9 for Figure 7 An enlarged schematic diagram of the D portion structure is shown; Figure 10 Schematic diagram of the connection structure between the orifice plate body and the regulating orifice plate of the present invention; Figure 11 for Figure 10 An enlarged schematic diagram of the E-section structure is shown; Figure 12 An exploded view of the flange and the orifice plate body of the present invention; Figure 13 This is a schematic diagram of the connection structure between the regulating orifice plate and the lower connecting groove of the present invention; Figure 14 This is a schematic diagram of the connection structure between the regulating orifice plate and the worm gear of the present invention; Figure 15 for Figure 14 The enlarged schematic diagram of the F part structure is shown; Figure 16 Schematic diagram of the connection structure between the regulating orifice plate and the air chamber of the present invention; Figure 17 for Figure 16 The enlarged schematic diagram of the G part structure is shown.

[0021] In the figure: 1. flange; 2. main structure; 201. pressure pipe; 202. orifice plate body; 203. three-valve group; 204. differential pressure gauge; 205. first center hole; 206. first side hole; 207. first sealing groove; 208. first sealing ring; 3. adjustment structure; 301. adjustment orifice plate; 302. worm gear; 303. second sealing groove; 304. second sealing ring; 305. second center hole; 306. second side hole; 307. worm; 4. recoil structure; 401. mounting groove; 402. gas ring; 403. nozzle; 404. cannula; 405. Sealing gasket; 406, air chamber; 407, first drainage channel; 408, lower connecting groove; 409, one-way valve; 410, upper connecting groove; 411, second drainage channel; 412, support plate; 413, air pump; 414, first solenoid valve; 415, first connecting pipe; 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 DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] 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-hole orifice plate flowmeter of the present invention 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 recoil 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 recoil structure 4, and a straight pipe 7 welded to the flange 1; The main structure 2 includes two pressure-guiding tubes 201 and an orifice plate body 202. A pressure-guiding tube 201 is installed on each flange 1. The 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 provided in a circumferential array on the orifice plate body 202. 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. A second center hole 305 is provided at the center of the adjusting orifice plate 301. Four second side holes 306 are provided in a circumferential array on the adjusting orifice plate 301. A worm gear 302 with an L-shaped cross section is fixedly connected to the adjusting orifice plate 301. The worm gear 302 is rotatably connected to the flange 1. A second sealing groove 303 is provided on the flange 1 and the orifice plate body 202. A second sealing ring 304 is provided inside the second sealing groove 303. The adjusting orifice plate 301 conflicts with the second sealing ring 304. A worm 307 is rotatably connected to the flange 1, and the worm 307 is engaged with the worm gear 302. When the flow measurement range needs to be adjusted, the worm 307 is rotated, and the worm 307 is engaged with the worm gear 302. , driving the worm gear 302 to rotate, and the worm gear 302 is fixed on the adjusting orifice plate 301, so that the adjusting orifice plate 301 rotates 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 are equal in diameter to 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, when the adjusting orifice plate 301 rotates, the overlap of the holes on the two layers of orifice plates is changed, 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 are also completely overlapped, the effective flow area of ​​the through hole is maximized, which is suitable for large flow measurement; when the adjusting orifice plate 301 is rotated by 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, thereby improving the applicability of the device; 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 side hole 306; the top ends of the two pressure-guiding pipes 201 are fixedly connected to the three-valve group 203, and the top end of the three-valve group 203 is installed with a differential pressure gauge 204; when the fluid flows through the orifice plate body 202, a pressure difference is generated before and after the orifice plate body 202, and the two pressure-guiding 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. ; A first sealing groove 207 is provided on the flange 1, and a first sealing ring 208 is provided inside the first sealing groove 207. The orifice plate body 202 conflicts with the two first sealing rings 208. When installing the flow meter, the two flanges 1 are bolted together and installed on the fluid pipeline to be measured for flow. The straight pipe 7 on the flange 1 is welded to the fluid pipeline to ensure a firm and sealed connection. The flange 1 equipped with the adjustment structure 3 is connected to the downstream pipeline. The orifice plate body 202 is installed between the two flanges 1. The first sealing ring 208 in the first sealing groove 207 is used to achieve sealing to prevent fluid leakage. Specifically, such as Figure 3 、 Figure 5 、 Figure 11 、 Figure 12 and Figure 13 As shown, the display structure 5 includes a slide groove 501 and a connecting rod 502, an arc-shaped slide groove 501 is provided on the flange 1, a connecting rod 502 is fixedly connected to the worm gear 302, the connecting rod 502 is slidably connected to the slide groove 501, a scale ring 504 is fixedly connected to the flange 1, and a display block 503 used in conjunction with the scale ring 504 is fixedly connected to the connecting rod 502; during the rotation of the adjustment orifice plate 301, the worm gear 302 drives the connecting rod 502 to slide in the slide groove 501 on the flange 1, and 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 adjustment orifice plate 301 through the position of the display block 503 on the scale ring 504, thereby accurately grasping the flow area adjustment state of the through hole.

[0024] 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 recoil structure 4 includes a mounting groove 401 and an air ring 402. The regulating orifice plate 301 is provided with five mounting grooves 401. The interior of the mounting groove 401 is fixedly connected to the air ring 402. A plurality of nozzles 403 are provided in a circumferential array on the air ring 402. A cannula 404 is fixedly connected to the air ring 402. An air chamber 406 is provided inside the regulating orifice plate 301. The cannula 404 is connected to the air chamber 406. A first drainage channel 407 is provided on the regulating orifice plate 301. A lower connecting groove 408 is provided on the edge of the regulating orifice plate 301. The lower connecting groove 408 is connected to the air chamber 406 through the first drainage channel 407. The flange 1 is provided with an upper connecting groove 410 , 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 is communicated with the first connecting pipe 415 through the second drainage channel 411, a supporting plate 412 is fixedly connected to the flange 1, an air pump 413 is fixedly connected to the supporting plate 412, a first solenoid valve 414 is fixedly connected to the supporting 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 intubation tube 404 is a "cross" structure, and a sealing gasket 405 is fixedly connected to one side of the intubation tube 404, the sealing gasket The sealing gasket 405 is in conflict with the regulating orifice plate 301; the cross-sectional end of the air ring 402 is trapezoidal, and a one-way valve 409 is provided inside the nozzle 403; when the through hole needs to be backflushed and cleaned, the regulating orifice plate 301 is first rotated by the regulating structure 3 so that the first side hole 206 and the second side hole 306 are completely overlapped. 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 outlet pipe 416 and the first electric valve 414. The magnetic valve 414 enters the first connecting pipe 415, and then enters the upper connecting groove 410 through the second drainage 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 air chamber 406 inside the regulating orifice plate 301 through the lower connecting groove 408 and the first drainage channel 407, and then enters the air ring 402 through the cannula 404. The nozzles 403 in the circumferential array on the air ring 402 spray out the high-pressure gas to reversely flush the through hole and remove 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 from the nozzle 403 toward the through hole, preventing the fluid in the pipeline from flowing out of the nozzle 403 after the backwash is completed.

[0025] Specifically, such as Figure 3 、 Figure 5 、 Figure 9 and Figure 17As shown, the sealing structure 6 includes a second air outlet 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 connecting groove 410, and a drainage pipe 604 is provided inside the flange 1. A second connecting pipe 603 is fixedly connected to one side of the flange 1, and the drainage pipe 604 is communicated with the second connecting pipe 603; a second air outlet pipe 601 is fixedly connected between the second solenoid valve 602 and the air pump 413, and the second connecting pipe 603 is fixedly connected to the second solenoid valve 602; before the recoil structure 4 works, the second solenoid valve 602 is opened at the same time, and 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 connecting groove 410 through the drainage pipe 604. The sealing airbag 605 is inflated to further enhance the sealing effect at the upper connecting groove 410, prevent high-pressure gas leakage, and ensure the recoil effect.

[0026] When using the present invention, first, the flow meter is installed. The two flanges 1 are bolted together and installed on the fluid pipeline whose flow needs 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 equipped with the adjustment structure 3 is connected to the downstream pipeline. The orifice plate body 202 is installed between the two flanges 1. The first sealing ring 208 in the first sealing groove 207 is used to achieve sealing to prevent fluid leakage. Then, when it is necessary to adjust the flow measurement range, the worm 307 is rotated, and the worm 307 engages with the worm gear 302, driving the worm gear 302 to rotate. The worm gear 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 are equal in diameter to the first center hole 205 and the first side hole 206 on the orifice plate body 202, and are all distributed in a circumferential array, when the adjusting orifice plate 301 rotates, the overlap of the holes on the two layers of orifice plates is changed, 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 are also completely overlapped, the effective flow area of ​​the through hole is maximized, which is suitable for large flow measurement; when the adjusting orifice plate 301 is rotated by 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, thereby improving the applicability of the device; At the same time, during the rotation of the regulating orifice plate 301, the worm gear 302 drives the connecting rod 502 to slide in the slide groove 501 on the flange 1, and 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 regulating orifice plate 301 through the position of the display block 503 on the scale ring 504, thereby accurately grasping the flow area adjustment state 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 fluid flow rate based on the pressure difference value. Secondly, when the through hole needs to be backflushed and cleaned, the adjusting orifice plate 301 is first rotated by the adjusting structure 3 so that the first side hole 206 and the second side hole 306 are completely overlapped. 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 enters the first connecting pipe 415 through the first outlet pipe 416 and the first solenoid valve 414, and then passes through the flange 1. The second drainage channel 411 at the bottom enters the upper connecting groove 410. 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 air chamber 406 inside the regulating orifice plate 301 through the lower connecting groove 408 and the first drainage channel 407, and then enters the air ring 402 through the cannula 404. The nozzles 403 in the circumferential array on the air ring 402 spray the high-pressure gas to reversely flush the through hole and remove 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 from the nozzle 403 toward the through hole, preventing the fluid in the pipeline from flowing out of the nozzle 403 after the backwash is completed. Finally, before the recoil structure 4 works, the second solenoid valve 602 is opened at the same time, and the high-pressure gas generated by the air pump 413 enters the second connecting pipe 603 through the second outlet pipe 601 and the second solenoid valve 602, and then enters the sealing airbag 605 inside the upper connecting groove 410 through the drainage pipe 604. The sealing airbag 605 is inflated to further enhance the sealing effect at the upper connecting groove 410, prevent high-pressure gas leakage, and ensure the recoil effect.

[0027] 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A porous orifice flowmeter, characterized in that It comprises two flanges (1), a main structure (2) provided on the two flanges (1), an adjustment structure (3) provided on the downstream flange (1), a recoil 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 recoil structure (4), and a straight pipe (7) welded to the flange (1); The main structure (2) comprises two pressure-guiding tubes (201) and an orifice plate body (202), one pressure-guiding tube (201) being mounted on each flange (1), an orifice plate body (202) being mounted between the two flanges (1), a first central hole (205) being provided at the center of the orifice plate body (202), and four first side holes (206) being provided in a circumferential array on the orifice plate body (202); The regulating structure (3) comprises a regulating orifice plate (301) and a worm gear (302); the flange (1) is rotatably connected to the regulating orifice plate (301); a second center hole (305) is provided at the center of the regulating orifice plate (301); four second side holes (306) are provided in a circumferential array on the regulating orifice plate (301); a worm gear (302) having an L-shaped cross section is fixedly connected to the regulating orifice plate (301); the worm gear (302) is rotatably connected to the flange (1); a second sealing groove (303) is provided on the flange (1) and the orifice plate body (202); a second sealing ring (304) is provided inside the second sealing groove (303); the regulating orifice plate (301) and the second sealing ring (304) are in contact; a worm (307) is rotatably connected to the flange (1); the worm (307) is meshed with the worm gear (302).

2. A multi-hole orifice plate flowmeter 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 side hole (306).

3. A multi-hole orifice plate flowmeter according to claim 1, characterized in that: The top ends of the two pressure-guiding pipes (201) are fixedly connected to a three-valve group (203), and a differential pressure gauge (204) is installed at the top end of the three-valve group (203).

4. A multi-hole orifice plate flowmeter according to claim 1, characterized in that: A first sealing groove (207) is provided on the flange (1), a first sealing ring (208) is provided inside the first sealing groove (207), and the orifice plate body (202) is in contact with the two first sealing rings (208).

5. The multi-hole 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 worm gear (302) is fixedly connected to the connecting rod (502); the connecting rod (502) is slidably connected to the slide groove (501); the flange (1) is fixedly connected to a scale ring (504); and the connecting rod (502) is fixedly connected to a display block (503) used in conjunction with the scale ring (504).

6. A multi-hole orifice plate flowmeter according to claim 1, characterized in that: The recoil structure (4) includes a mounting groove (401) and an air ring (402), the regulating orifice plate (301) is provided with five mounting grooves (401), the interior of the mounting groove (401) is fixedly connected to an air ring (402), a plurality of nozzles (403) are provided in a circumferential array on the air ring (402), a cannula (404) is fixedly connected to the air ring (402), an air chamber (406) is provided inside the regulating orifice plate (301), the cannula (404) is communicated with the air chamber (406), a first drainage channel (407) is provided on the regulating orifice plate (301), and a lower connecting groove (408) is provided on the edge of the regulating orifice plate (301), and the lower connecting groove (408) is connected to the air chamber (406) through the first drainage channel (407). The flange (1) is connected to the chamber (406), 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) is connected to the first connecting pipe (415) through the second drainage channel (411), a supporting plate (412) is fixedly connected to the flange (1), an air pump (413) is fixedly connected to the supporting plate (412), a first electromagnetic valve (414) is fixedly connected to the supporting plate (412), the first connecting pipe (415) is fixedly connected to the first electromagnetic valve (414), and a first air outlet pipe (416) is fixedly connected between the first electromagnetic valve (414) and the air pump (413).

7. A multi-hole orifice plate flowmeter according to claim 6, characterized in that: The cross section of the cannula (404) is a "cross"-shaped structure, and a sealing gasket (405) is fixedly connected to one side of the cannula (404), and the sealing gasket (405) is in conflict with the regulating orifice plate (301).

8. The multi-hole orifice plate flowmeter according to claim 6, characterized in that: The cross-sectional end of the air ring (402) is trapezoidal, and a one-way valve (409) is provided inside the nozzle (403).

9. The multi-hole orifice plate flowmeter according to claim 6, characterized in that: The sealing structure (6) includes a second air outlet pipe (601) and a second electromagnetic valve (602); the second electromagnetic valve (602) is fixedly connected to the support plate (412); an annular sealing airbag (605) is provided inside the upper connecting groove (410); a drainage pipe (604) is provided inside the flange (1); a second connecting pipe (603) is fixedly connected to one side of the flange (1); and the drainage pipe (604) is communicated with the second connecting pipe (603).

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

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