An improved differential pressure orifice flowmeter

Abstract

The present invention discloses an improved differential pressure orifice flowmeter, which belongs to the technical field of differential pressure flowmeters and comprises: a differential pressure orifice flowmeter, wherein the differential pressure orifice flowmeter is installed with four groups, the four groups of differential pressure orifice flowmeters are installed on a base, an orifice plate is installed in the differential pressure orifice flowmeter, and two groups of pressure pipes are connected to the differential pressure orifice flowmeter; a clamping unit, which is rotatably connected in the differential pressure orifice flowmeter and has an orifice plate engaged therein; and a rotating unit, which is rotatably connected to the base and is slidably connected to the clamping unit. When the orifice plate of the differential pressure orifice flowmeter is clogged after long-term use, the rotating unit is turned on at this time, and the two groups of clamping units, in cooperation with the rotating unit, drive the orifice plate to rotate out of the interior of the two groups of differential pressure orifice flowmeters and automatically loosen the orifice plate, making it easy to clean the clogged orifice plate. The invention has the advantages of being simple, efficient and highly automated.

Description

Technical Field

[0001] The invention relates to the technical field of differential pressure flowmeters, in particular to an improved differential pressure orifice flowmeter. Background Art

[0002] A Chinese patent (publication number: CN221840493U) discloses an improved antifreeze and heat insulation device for differential pressure flowmeters, belonging to the technical field of differential pressure flowmeters. The device comprises an isolation fluid chamber, internally mounted with a partition plate, comprising a positive pressure chamber and a negative pressure chamber. The partition plate is used to divide the isolation fluid chamber into positive and negative pressure chambers. A balancing valve is rotatably connected to the sidewall of the isolation fluid chamber. The balancing valve is used to eliminate the liquid level difference between the positive and negative pressure chambers to reduce flow measurement errors. Two sets of sealing plugs are threadedly connected to the top of the isolation fluid chamber. By providing a larger isolation fluid chamber design, the patent ensures that the isolation fluid level in the positive and negative pressure chambers remains consistent, eliminating flow measurement errors caused by the liquid level difference.

[0003] The improved differential pressure flowmeter antifreeze and heat insulation device in the above technical solution still has the following defects when in use: after the differential pressure orifice flowmeter is used for a long time, when the fluid in the pipeline contains impurities, the orifice plate inside the differential pressure orifice flowmeter is prone to blockage, and the existing differential pressure orifice flowmeter needs to be disassembled as a whole before cleaning, and the operation is relatively cumbersome. Therefore, it is necessary to provide an improved differential pressure orifice flowmeter to solve the above problems. Summary of the Invention

[0004] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide an improved differential pressure orifice flowmeter to solve the problems in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An improved differential pressure orifice flowmeter, comprising:

[0007] A differential pressure orifice flowmeter, wherein four groups of differential pressure orifice flowmeters are installed on a base, an orifice plate is installed in each differential pressure orifice flowmeter, and two groups of pressure pipes are connected to the differential pressure orifice flowmeter;

[0008] The clamping unit is rotatably connected to the differential pressure orifice flowmeter, and the orifice plate is clamped inside for installing the orifice plate;

[0009] The rotating unit is rotatably connected to the base and slidably connected to the clamping unit, and is used to cooperate with the clamping unit to realize the disassembly and position switching of the four sets of orifice plates;

[0010] The sealing unit is slidably connected in the differential pressure orifice flowmeter, and the end portion is snap-connected with the surface of the orifice plate, and is used to seal between the orifice plate and the differential pressure orifice flowmeter.

[0011] As a preferred technical solution of the present invention, the clamping unit includes: a turntable, which is rotatably connected to the surface of the base, and four groups of rotating shafts are rotatably connected inside the turntable; a rotating wheel, which is installed on the surface of the rotating shaft and rotatably connected inside the turntable, and two groups of arc grooves are opened on the surface; a sliding frame, which is slidably connected to the surface of the turntable, and the side of the turntable is connected to the sliding column, and the two groups of sliding columns are respectively slidably connected in the two groups of arc grooves; a clamping frame, which is connected to the side of the sliding frame, and a clamping groove is opened on the surface, and the orifice plate is clamped in the two groups of clamping grooves.

[0012] As a preferred technical solution of the present invention, a positioning column is fixed to the side of the sliding frame, a positioning groove is opened on the surface of the turntable, and the positioning column is slidably connected in the positioning groove.

[0013] As a preferred technical solution of the present invention, the rotating unit includes: a concave hole, which is opened in the turntable; a rotating frame, which is installed on the surface of the rotating shaft and is rotatably connected in the concave hole; a double-ear frame, which is connected to the side of the base close to the differential pressure orifice flowmeter and is slidably connected to the surface of the rotating frame; a rotating rod, which is rotatably connected in the base and the end is connected to the turntable; a driving member, which is installed on the base, and the end of the rotating rod is connected to the output end of the driving member.

[0014] As a preferred technical solution of the present invention, a torsion spring is installed on the end surface of the rotating shaft close to the rotating frame, one end of the torsion spring is connected to the inner wall of the concave hole, and the other end is connected to the rotating frame.

[0015] As a preferred technical solution of the present invention, the sealing unit includes: a dynamic ring, which is slidably connected to the inner wall of the differential pressure orifice flowmeter; a fixed frame, which is connected to the inner side of the differential pressure orifice flowmeter and has at least two sets of sliding rods slidably connected inside; a tilting frame, which is hinged on the inner wall of the differential pressure orifice flowmeter and has a surface and an end of the sliding rod slidably connected; a fixed block, which is connected to the end of the sliding rod and is engaged with the surface of the dynamic ring; and an elastic member, which is connected between the fixed block and the fixed frame.

[0016] As a preferred technical solution of the present invention, the orientation of the tilting frame is opposite to the direction of fluid flow in the differential pressure orifice flowmeter.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: during use of the differential pressure orifice flowmeter in the present invention, the orifice plate in the differential pressure orifice flowmeter will be automatically sealed under the action of the sealing unit, thereby improving the sealing performance of the differential pressure orifice flowmeter.

[0018] Compared with the prior art in which the orifice plate inside the differential pressure orifice flowmeter is prone to clogging and needs to be disassembled as a whole for cleaning, the embodiments of the present invention provide a clamping unit and a rotating unit. When the orifice plate of the differential pressure orifice flowmeter is clogged after long-term use, the rotating unit is turned on, and the two groups of clamping units will drive the orifice plate to rotate out of the two groups of differential pressure orifice flowmeters with the cooperation of the rotating unit and automatically loosen the orifice plate, while the other two groups of clamping units will drive the orifice plate to rotate into the two groups of differential pressure orifice flowmeters and automatically fix the orifice plate, thereby realizing automatic replacement of the orifice plate inside the differential pressure orifice flowmeter, facilitating cleaning of the clogged orifice plate, and having the advantages of simplicity, efficiency and high automation.

[0019] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of an improved differential pressure orifice flowmeter provided by an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the rotating unit provided in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the structure of the clamping unit provided in an embodiment of the present invention.

[0023] Figure 4 for Figure 1 A partial enlarged view of part A.

[0024] Figure numerals: 1. differential pressure orifice flowmeter; 10. orifice plate; 11. pressure guiding tube; 12. base; 2. clamping unit; 21. turntable; 22. rotating shaft; 23. rotating wheel; 24. arc groove; 25. sliding frame; 26. clamping frame; 261. clamping groove; 27. positioning column; 28. positioning groove; 3. rotating unit; 31. recessed hole; 32. rotating frame; 33. double-ear frame; 34. rotating rod; 35. driving part; 4. sealing unit; 41. dynamic ring; 42. fixing frame; 43. sliding rod; 44. tilting frame; 45. fixing block; 46. elastic part. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0027] See also Figures 1 to 4 , an improved differential pressure orifice flowmeter, comprising:

[0028] A differential pressure orifice flowmeter 1, wherein four groups of differential pressure orifice flowmeters 1 are installed, and the four groups of differential pressure orifice flowmeters 1 are installed on a base 12, wherein an orifice plate 10 is installed in the differential pressure orifice flowmeter 1, and two groups of pressure pipes 11 are connected to the differential pressure orifice flowmeter 1;

[0029] The clamping unit 2 is rotatably connected to the differential pressure orifice flowmeter 1, and the orifice plate 10 is engaged therein for installing the orifice plate 10;

[0030] The rotating unit 3 is rotatably connected to the base 12 and is slidably connected to the clamping unit 2, and is used to cooperate with the clamping unit 2 to realize the disassembly and position switching of the four groups of orifice plates 10;

[0031] The sealing unit 4 is slidably connected in the differential pressure orifice flowmeter 1 , and its end is snap-fitted to the surface of the orifice plate 10 , so as to seal between the orifice plate 10 and the differential pressure orifice flowmeter 1 .

[0032] In an embodiment of the present invention, during use of the differential pressure orifice flowmeter 1, the orifice plate 10 in the differential pressure orifice flowmeter 1 is automatically sealed under the action of the sealing unit 4, thereby improving the sealing performance of the differential pressure orifice flowmeter 1. When the orifice plate 10 of the differential pressure orifice flowmeter 1 is clogged after long-term use, the rotating unit 3 is turned on at this time, and the two sets of clamping units 2 drive the orifice plate 10 to rotate out of the two sets of differential pressure orifice flowmeters 1 under the cooperation of the rotating unit 3, and automatically loosen the orifice plate 10, facilitating the disassembly and cleaning of the orifice plate 10, while the other two sets of clamping units 2 drive the orifice plate 10 to rotate into the two sets of differential pressure orifice flowmeters 1, and automatically fix the orifice plate 10, thereby realizing the automatic replacement of the orifice plate 10 inside the differential pressure orifice flowmeter 1, facilitating the cleaning of the clogged orifice plate 10, and having the advantages of simplicity, high efficiency and high automation.

[0033] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the clamping unit 2 includes:

[0034] A turntable 21 is rotatably connected to the surface of the base 12, and four sets of rotating shafts 22 are rotatably connected in the turntable 21;

[0035] The rotating wheel 23 is mounted on the surface of the rotating shaft 22 and is rotatably connected to the rotating disk 21. Two sets of arc grooves 24 are opened on the surface of the rotating wheel;

[0036] The sliding frame 25 is slidably connected to the surface of the turntable 21. The side of the turntable 21 is connected to the sliding posts. The two sets of sliding posts are slidably connected in the two sets of arc grooves 24 respectively.

[0037] The clamping frame 26 is connected to the side of the sliding frame 25 and has clamping grooves 261 on its surface. The orifice plate 10 is engaged in two groups of clamping grooves 261 .

[0038] In this embodiment, when the differential pressure orifice flowmeter 1 is in use, two sets of differential pressure orifice flowmeters 1 are installed on the pipes to be measured in different directions. When the orifice plate 10 is installed, the orifice plate 10 is placed in the clamping groove 261, and the rotating shaft 22 is rotated. When the rotating shaft 22 rotates, the rotating wheel 23 can drive the rotating wheel 23 to rotate in the rotating disk 21. At the same time, when the rotating wheel 23 rotates, it can drive the arc groove 24 on its surface to rotate synchronously. Since the two sets of sliding columns are respectively slidably connected in the two sets of arc grooves 24, the two sets of sliding frames 25 will move closer to or away from each other on the surface of the rotating disk 21 under the action of the two sets of arc grooves 24 and the sliding columns. When the two sets of sliding frames 25 approach each other, they can drive the clamping frames 26 on their sides to move closer synchronously, so that the two sets of clamping frames 26 can clamp and fix the orifice plate 10 through the two sets of clamping grooves 261.

[0039] In one embodiment of the present invention, Figure 1 As shown, a positioning post 27 is fixed to the side of the sliding frame 25 , and a positioning groove 28 is opened on the surface of the turntable 21 , and the positioning post 27 is slidably connected in the positioning groove 28 .

[0040] In this embodiment, when the sliding frame 25 slides on the surface of the turntable 21, it can drive the positioning column 27 to slide in the positioning groove 28, so that the sliding frame 25 will be guided and limited under the action of the positioning column 27 and the positioning groove 28, thereby improving the stability of the sliding frame 25 sliding on the surface of the turntable 21.

[0041] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the rotating unit 3 includes:

[0042] A recessed hole 31 is provided in the rotating disk 21;

[0043] The rotating frame 32 is mounted on the surface of the rotating shaft 22 and is rotatably connected to the recessed hole 31;

[0044] The double-ear frame 33 is connected to the side of the base 12 close to the differential pressure orifice flowmeter 1 and is slidably connected to the surface of the rotating frame 32;

[0045] A rotating rod 34 is rotatably connected to the base 12, and its end is connected to the turntable 21;

[0046] The driving member 35 is mounted on the base 12 , and the end of the rotating rod 34 is connected to the output end of the driving member 35 .

[0047] In this embodiment, after the differential pressure orifice flowmeter 1 has been used for a long time, the orifice plate 10 is prone to clogging. In this case, the bolts of the two sets of differential pressure orifice flowmeters 1 near the turntable 21 are loosened. The two cleaned orifice plates 10 are placed in two sets of clamping frames 26 at adjacent stations of the differential pressure orifice flowmeter 1. The driving member 35 is turned on, and the output end of the driving member 35 can drive the turntable 21 on its surface to rotate via the rotating rod 34. When the turntable 21 rotates, the two sets of sliding frames 25 can drive the clamping frames 26 to rotate, so that the two sets of clamping frames 26 can drive the orifice plates 10 inside them to rotate via the clamping grooves 261.

[0048] When the turntable 21 rotates 90 degrees, the clamping frame 26 will drive the orifice plate 10 to rotate synchronously 90 degrees through the clamping groove 261. Since the clamping frames 26 are installed on the four sides of the turntable 21, the clamping frames 26 on the four sides and the orifice plates 10 inside them will all rotate to the next workstation, so that the clamping frame 26 inside the differential pressure orifice flowmeter 1 will drive the orifice plate 10 on its surface to rotate out of the differential pressure orifice flowmeter 1 through the clamping groove 261, and the clamping frame 26 at the adjacent workstation will drive the orifice plate 10 to rotate into the differential pressure orifice flowmeter 1 through the clamping groove 261, thereby realizing the automatic replacement of the orifice plate 10 inside the differential pressure orifice flowmeter 1.

[0049] The turntable 21 can drive the four sets of rotating shafts 22 and the rotating wheel 23 to rotate synchronously when rotating, and the rotating shaft 22 can drive the rotating frame 32 on its surface to rotate. When the two sets of clamping frames 26 drive the orifice plate 10 to rotate to the inside of the differential pressure orifice flowmeter 1, since the double-ear frame 33 is located at the position of the base 12 close to the differential pressure orifice flowmeter 1, when the rotating shaft 22 drives the rotating frame 32 to rotate to the side of the differential pressure orifice flowmeter 1, the rotating frame 32 will contact the double-ear frame 33, so that the rotating frame 32 will drive the rotating shaft 22 to rotate in the turntable 21 under the action of the double-ear frame 33, so that the rotating shaft 22 will drive the arc groove 2 through the rotating wheel 23. 4 rotates, so that the two sets of sliding frames 25 will move closer to each other on the surface of the turntable 21 under the action of the two sets of arc-shaped grooves 24 and the sliding columns, so that the two sets of clamping frames 26 can clamp and fix the orifice plate 10 through the two sets of clamping grooves 261. In other words, when the two sets of clamping frames 26 drive the orifice plate 10 to rotate to the inside of the differential pressure orifice flowmeter 1, the two sets of clamping frames 26 will move closer to each other under the action of the rotating frame 32 and the double-ear frame 33, thereby realizing automatic fixation of the orifice plate 10.

[0050] Since a torsion spring is installed on the end surface of the rotating shaft 22 close to the rotating frame 32, one end of the torsion spring is connected to the inner wall of the recessed hole 31, and the other end is connected to the rotating frame 32, when the rotating shaft 22 drives the rotating frame 32 to rotate, the rotating frame 32 can compress the torsion spring.

[0051] When the rotary disc 21 drives the rotary frame 32 to rotate away from the differential pressure orifice flowmeter 1 through the rotary shaft 22, since there is no double ear frame 33 at the position away from the differential pressure orifice flowmeter 1, the rotary frame 32 rotates to separate from the double ear frame 33. At this time, the rotary frame 32 will drive the rotary shaft 22 to rotate in the reverse direction in the rotary disc 21 under the action of the torsion spring, so that the runner 23 can drive the arc groove 24 to rotate in the reverse direction, so that the two sets of sliding frames 25 will move away from each other on the surface of the rotary disc 21 under the action of the two sets of arc grooves 24 and the sliding column, and then the two sets of sliding frames 25 can drive the two sets of clamping grooves 261 to move away from each other through the clamping frame 26. So when the clamping frame 26 drives the orifice plate 10 to rotate out of the differential pressure orifice flowmeter 1, the two sets of clamping frames 26 will open to each other, so that the orifice plate 10 can be automatically disassembled, which is convenient for cleaning the clogged orifice plate 10, with the advantages of simplicity, efficiency and high automation.

[0052] The driving member 35 can be an electric motor or a pneumatic motor to drive the rotating rod 34 to rotate stably in the base 12.

[0053] In one embodiment of the present invention, Figure 4 As shown, the sealing unit 4 includes:

[0054] The dynamic ring 41 is slidably connected to the inner wall of the differential pressure orifice flowmeter 1 and is slidably connected to the surface of the orifice plate 10;

[0055] The fixing frame 42 is connected to the inner side of the differential pressure orifice flowmeter 1 and has at least two sets of sliding rods 43 slidably connected therein;

[0056] The tilt frame 44 is hinged on the inner wall of the differential pressure orifice flowmeter 1, and the surface is slidably connected to the end of the slide rod 43;

[0057] The fixed block 45 is connected to the end of the slide rod 43 and is engaged with the surface of the dynamic ring 41;

[0058] The elastic member 46 is connected between the fixing block 45 and the fixing frame 42 .

[0059] In this embodiment, after the orifice plate 10 is installed, during the use of the differential pressure orifice flowmeter 1 , the orientation of the tilting frame 44 is opposite to the direction of the fluid flow in the differential pressure orifice flowmeter 1 .

[0060] Therefore, the tilting frame 44 will rotate toward the slide rod 43 under the drive of the fluid in the differential pressure orifice flowmeter 1, and the slide rod 43 will slide toward the moving ring 41 in the fixed frame 42 under the pressure of the tilting frame 44, so that the slide rod 43 can drive the fixed block 45 to squeeze the moving ring 41, so that the moving ring 41 slides toward the orifice plate 10 in the differential pressure orifice flowmeter 1, and then the surface of the orifice plate 10 and the surface of the moving ring 41 can be in close contact, thereby improving the sealing between the orifice plate 10 and the differential pressure orifice flowmeter 1. Moreover, the greater the flow rate of the fluid in the differential pressure orifice flowmeter 1, the greater the inclination angle of the tilting frame 44 will be, the tighter the contact between the moving ring 41 and the surface of the orifice plate 10 will be, and the stronger the sealing between the orifice plate 10 and the differential pressure orifice flowmeter 1 will be.

[0061] When the slide bar 43 drives the fixed block 45 to slide, the fixed block 45 can stretch the elastic member 46. When the flow rate of the fluid in the differential pressure orifice flowmeter 1 decreases, the fixed block 45 can drive the slide bar 43 to reset in the fixed frame 42 under the elastic force of the elastic member 46, thereby facilitating the maintenance of the orifice plate 10. The elastic member 46 can be a spring or elastic rubber, which is not limited here.

[0062] The working principle of the present invention is: after the differential pressure orifice flowmeter 1 has been used for a long time, the orifice plate 10 is prone to blockage. At this time, the driving member 35 is turned on, and the output end of the driving member 35 can drive the turntable 21 on its surface to rotate through the rotating rod 34. When the turntable 21 rotates 90 degrees, the clamping frames 26 on the four sides and the orifice plate 10 inside thereof will all rotate to the next workstation, so that the clamping frame 26 inside the differential pressure orifice flowmeter 1 will drive the orifice plate 10 on its surface to rotate out of the differential pressure orifice flowmeter 1 through the clamping groove 261, and the clamping frame 26 at the adjacent workstation will drive the orifice plate 10 to rotate into the differential pressure orifice flowmeter 1 through the clamping groove 261, thereby realizing the automatic replacement of the orifice plate 10 inside the differential pressure orifice flowmeter 1.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An improved differential pressure orifice flowmeter, characterized in that: The improved differential pressure orifice flowmeter comprises: A differential pressure orifice flowmeter (1), wherein four groups of the differential pressure orifice flowmeters (1) are installed, and the four groups of differential pressure orifice flowmeters (1) are installed on a base (12). An orifice plate (10) is installed in the differential pressure orifice flowmeter (1), and two groups of pressure pipes (11) are connected to the differential pressure orifice flowmeter (1); A clamping unit (2) is rotatably connected to the differential pressure orifice flowmeter (1), and has an orifice plate (10) engaged therein for mounting the orifice plate (10); The rotating unit (3) is rotatably connected to the base (12) and is slidably connected to the clamping unit (2), and is used to cooperate with the clamping unit (2) to realize the disassembly and position switching of the four groups of orifice plates (10); A sealing unit (4) is slidably connected in the differential pressure orifice flowmeter (1), and its end is snap-connected to the surface of the orifice plate (10), and is used to seal between the orifice plate (10) and the differential pressure orifice flowmeter (1). The sealing unit (4) includes: a dynamic ring (41) slidably connected to the inner wall of the differential pressure orifice flowmeter (1) and slidably connected to the surface of the orifice plate (10); a fixed frame (42) connected to the inner side of the differential pressure orifice flowmeter (1), and slidingly connected to the inner side of the orifice plate flowmeter (1). At least two groups of slide bars (43) are connected; a tilting frame (44) is hinged on the inner wall of the differential pressure orifice flowmeter (1), and its surface is slidably connected to the end of the slide bar (43), and the direction of the tilting frame (44) is opposite to the flow direction of the fluid in the differential pressure orifice flowmeter (1); a fixed block (45) is connected to the end of the slide bar (43) and is engaged with the surface of the dynamic ring (41); and an elastic member (46) is connected between the fixed block (45) and the fixed frame (42).

2. The improved differential pressure orifice flowmeter according to claim 1, characterized in that: The clamping unit (2) comprises: A turntable (21) is rotatably connected to the surface of the base (12), and four sets of rotating shafts (22) are rotatably connected in the turntable (21); The rotating wheel (23) is mounted on the surface of the rotating shaft (22) and is rotatably connected to the rotating disk (21). The surface of the rotating wheel (23) is provided with two sets of arc grooves (24); A sliding frame (25) is slidably connected to the surface of the turntable (21), and the side of the turntable (21) is connected to sliding posts, and two groups of sliding posts are respectively slidably connected in two groups of arc grooves (24); The clamping frame (26) is connected to the side of the sliding frame (25) and has clamping grooves (261) on its surface. The orifice plate (10) is engaged in two groups of clamping grooves (261).

3. The improved differential pressure orifice flowmeter according to claim 2, characterized in that: A positioning column (27) is fixed on the side of the sliding frame (25), and a positioning groove (28) is opened on the surface of the rotating disk (21), and the positioning column (27) is slidably connected in the positioning groove (28).

4. The improved differential pressure orifice flowmeter according to claim 2, characterized in that: The rotating unit (3) comprises: A recessed hole (31) is provided in the rotating disk (21); A rotating frame (32) is mounted on the surface of the rotating shaft (22) and is rotatably connected in the concave hole (31); A double-ear frame (33) is connected to the side of the base (12) close to the differential pressure orifice flowmeter (1) and is slidably connected to the surface of the rotating frame (32); A rotating rod (34) is rotatably connected to the base (12), and an end portion is connected to the turntable (21); The driving member (35) is mounted on the base (12), and the end of the rotating rod (34) is connected to the output end of the driving member (35).

5. The improved differential pressure orifice flowmeter according to claim 4, characterized in that: A torsion spring is installed on the end surface of the rotating shaft (22) close to the rotating frame (32), one end of the torsion spring is connected to the inner wall of the concave hole (31), and the other end is connected to the rotating frame (32).

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