Wedge-shaped differential pressure flowmeter

Abstract

The invention discloses a wedge-shaped differential pressure flowmeter, and belongs to the technical field of flowmeter equipment. Comprising a pipe body, a differential pressure device and a wedge-shaped mechanism, the wedge-shaped mechanism comprises two baffles, an adjusting assembly and two blocking parts, induction mechanisms are arranged on the two sides of the pipe body, an insertion opening is formed in the upper side of the pipe body, and the bottom ends of the two baffles are in V-shaped rolling contact; the sensing mechanism comprises a turbine, a gear ring, a cylinder body, a pressure sensing device, a first impeller, a first pressure spring, a first gear and a main shaft, and the pressure tapping assembly is arranged in the upper side wall in the pipe body and is connected with the main shaft through a linkage part. The problem that the measurement accuracy is affected due to the fact that a wedge-shaped structure cannot be automatically adjusted according to the flowing state of fluid is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flowmeter devices, and particularly to a wedge differential pressure flowmeter. Background Art

[0002] The wedge flowmeter is a throttling differential pressure type flow measurement instrument, suitable for measuring volumetric flow and mass flow in industries such as petroleum and chemical industries. The throttling element of the wedge flowmeter is a V-shaped wedge block, and its principle is to measure the pressure difference between the upstream side and the downstream side of the throttling element, and convert the measured pressure difference into flow according to Bernoulli's equation and continuity equation.

[0003] In the existing wedge flows, such as the utility model patent with the publication number CN205561935U discloses a wedge flowmeter, the utility model patent with the publication number CN211954280U discloses an adjustable wedge flowmeter, and the utility model patent with the publication number CN221198547U discloses a variable flow wedge flowmeter. In the above-mentioned wedge flowmeters, when adjusting the wedge structure, manual adjustment is required, and the wedge structure cannot be adjusted automatically according to the flow state of the fluid, thus affecting the measurement accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a wedge differential pressure flowmeter to solve the problem that when adjusting the wedge structure, manual adjustment is required, and the wedge structure cannot be adjusted automatically according to the flow state of the fluid, thus affecting the measurement accuracy as proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A wedge differential pressure flowmeter, comprising: a pipe body, a differential pressure device and a wedge mechanism. The wedge mechanism is arranged on the upper side of the middle part of the pipe body, the differential pressure device is fixedly installed on the side part of the pipe body, pressure taking components are arranged on both sides of the differential pressure device, and flange plates are fixedly installed at both ends of the pipe body for connecting with pipelines; The wedge mechanism includes two baffle plates, an adjustment component and two groups of plugging components. Induction mechanisms are arranged on both sides of the pipe body. The adjustment component is connected with the induction mechanism at the input end through a transmission component. An insertion port is opened on the upper side of the pipe body. The bottoms of the two baffle plates are rotatably installed on the inner side wall of the pipe body through support rods and are both located in the insertion port. The bottoms of the two baffle plates are in rolling contact in a V shape, and the tops are both connected with the adjustment component; The induction mechanism includes a turbine, a gear ring, a cylinder body, a pressure sensing device, a first impeller, a first compression spring, a first gear and a main shaft. The cylinder body is vertically and fixedly installed on the upper side of the pipe body through a bracket. The pressure sensing device is fixedly installed on the inner top of the cylinder body. The turbine is rotatably embedded in the inner wall of the pipe body. The gear ring is fixedly installed on the side wall of the turbine. The first gear is fixedly sleeved on the bottom end of the main shaft and is meshed with the gear ring. The first impeller is vertically slidably sleeved on the main shaft. A support ring is rotatably embedded on the upper side of the first impeller. The first compression spring is vertically sleeved on the upper side of the main shaft, and its upper and lower ends are respectively fixedly connected to the induction end of the bottom side of the pressure sensing device and the upper side of the support ring; The pressure taking assembly is arranged in the upper side wall inside the pipe body and is connected to the main shaft through a linkage component.

[0006] As a preferred technical solution of the present invention, a sealing shell is fixedly installed on the upper side of the pipe body. The wedge mechanism is arranged inside the sealing shell. The adjusting assembly includes a first screw rod, a truss, two sliding frames, two sliding rods and two connecting plates. The truss is vertically and fixedly installed on the upper side of the pipe body. The two sliding frames are symmetrically and vertically arranged, and their tops are slidably embedded in the truss. The first screw rod is horizontally rotatably sleeved inside the truss. The two sliding frames are both threadedly sleeved on the first screw rod. The end of the first screw rod close to the input end penetrates through the sealing shell and enters the cylinder body. The two connecting plates are respectively fixedly installed on the tops of the two baffles. The two sliding rods are respectively horizontally and radially fixedly sleeved inside the two connecting plates and are respectively in sliding contact with the inside of the two sliding frames.

[0007] As a preferred technical solution of the present invention, the transmission component is arranged at the bottom side of the first impeller at the input end and includes a snap ring, a first rack and a second gear. The snap ring is rotatably sleeved on the bottom of the first impeller. A clamping plate is horizontally fixedly installed on the inner wall of the cylinder body at the input end. The first rack is vertically slidably sleeved inside the clamping plate, and its top end is fixedly connected to the bottom side of the snap ring. The second gear is fixedly sleeved on the end of the first screw rod and is meshed with the first rack.

[0008] As a preferred technical solution of the present invention, the plugging component includes a sealing plate and a magnetic block. A sliding cavity is horizontally opened inside the top wall of the pipe body. The sealing plate is horizontally and sealingly slidably sleeved inside the sliding cavity. The magnetic block is fixedly installed on the bottom side of the baffle. One ends of the two sealing plates close to each other are respectively adsorbed by the two magnetic blocks.

[0009] As a preferred technical solution of the present invention, the pressure taking assembly includes a connecting pipe, a flexible pipe and a pipe head. The connecting pipe is fixedly sleeved inside the pipe body. The pipe head is vertically arranged and is connected to the linkage component. The top end of the pipe head is fixedly connected and communicated with the input end of the connecting pipe through the flexible pipe.

[0010] As a preferred technical solution of the present invention, the linkage component includes a second screw rod, a slider, a second impeller, a third gear, a second rack, a horizontal plate, a pressing ring, a pulling ring and a second compression spring. Horizontally symmetric sliding grooves are formed on the bottom side of the inner top wall of the pipe body. The slider is horizontally and slidably embedded in the sliding grooves. The second screw rod is horizontally rotatably sleeved on the top of the pipe body and penetrates through the sliding grooves. The third gear is fixedly sleeved on the end of the second screw rod. The slider is threadedly sleeved on the second screw rod. The pipe head and the input end of the hose are both fixedly sleeved in the slider and fixedly connected and communicated. The second impeller is vertically slidably sleeved on the main shaft. The horizontal plate is horizontally and fixedly installed on the inner wall of the cylinder body. The pressing ring and the pulling ring are respectively rotatably sleeved on the upper and lower sides of the second impeller. The second compression spring is vertically sleeved on the main shaft, and the upper and lower ends are respectively fixedly connected to the bottom of the horizontal plate and the upper side of the pressing ring. The second rack is vertically slidably sleeved in the top wall of the pipe body, and the top end is fixedly connected to the pulling ring. The third gear is meshed with the second rack.

[0011] As a preferred technical solution of the present invention, two pressure sensing and display devices are fixedly installed on the outer side of the pipe body, and are electrically connected to the two pressure sensing devices respectively, for feeding back the pressure data of the two pressure sensing devices.

[0012] Compared with the prior art, the present invention provides a wedge differential pressure flowmeter, which has the following beneficial effects: (1) Under the cooperation of the sensing mechanism and the transmission component, the opening angle of the wedge-shaped structure formed by the two baffles can be automatically adjusted according to the flow rate of the fluid, and can be adjusted in real time as the flow rate changes, which more fully ensures the accuracy of measurement; (2) The pressure values of the two pressure sensing devices can indirectly reflect the change of the pressure difference of the fluid. By comparing the measurement results of the differential pressure device, it can be judged whether the differential pressure device is in a normal working state, which has a reference effect; (3) Under the cooperation of the linkage component, according to the different opening angles of the wedge-shaped structure, the distance between the pipe head and the wedge mechanism is adjusted to ensure that the sampling point is in the effective sampling area and avoid the influence of eddy current instability factors, further ensuring the accuracy of measurement. Description of the Drawings

[0013] Figure 1 is a three-dimensional structural schematic diagram of a wedge differential pressure flowmeter proposed by the present invention; Figure 2 is a front view partial cross-sectional structural schematic diagram of a wedge differential pressure flowmeter proposed by the present invention; Figure 3 is Figure 2 the enlarged structure diagram at A in Figure 4 is Figure 2 the enlarged structure diagram at B in Figure 5 isFigure 2 Enlarged view of the structure at position C in

[0014] In the figure: 1, pipe body; 101, socket; 2, differential pressure device; 3, flange; 4, baffle; 401, support rod; 5, housing; 6, turbine; 7, gear ring; 8, cylinder; 801, air hole; 9, pressure sensing device; 10, first impeller; 11, first compression spring; 12, first gear; 13, main shaft; 14, carrier; 15, support ring; 16, first screw; 17, truss; 18, sliding carriage; 19, sliding rod; 20, connecting plate; 21, snap ring; 22, first rack; 23, second gear; 24, pressure sensing display device; 25, clamping plate; 26, sealing plate; 27, magnet; 28, sliding cavity; 29, connecting pipe; 30, hose; 31, pipe head; 32, second screw; 33, slider; 34, second impeller; 35, third gear; 36, second rack; 37, cross plate; 38, pressure ring; 39, pull ring; 40, second compression spring; 41, sliding groove. Specific embodiments

[0015] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] Refer to Figures 1-5 , a wedge differential pressure flowmeter, comprising: a pipe body 1, a differential pressure device 2 and a wedge mechanism. The wedge mechanism is arranged on the upper side of the middle part of the pipe body 1, the differential pressure device 2 is fixedly installed on the side of the pipe body 1, pressure taking components are arranged on both sides of the differential pressure device 2, and flange plates 3 are fixedly installed at both ends of the pipe body 1 for connecting with pipelines; The wedge mechanism includes two baffles 4, an adjusting component and two groups of plugging components. Induction mechanisms are arranged on both sides of the pipe body 1. The adjusting component is connected to the induction mechanism at the input end through a transmission component. An insertion opening 101 is formed on the upper side of the pipe body 1. The bottoms of the two baffles 4 are rotatably installed on the inner side wall of the pipe body 1 through support rods 401 and are both located in the insertion opening 101. The bottoms of the two baffles 4 are in rolling contact in a V shape, and the tops are both connected to the adjusting component; The induction mechanism includes a turbine 6, a gear ring 7, a cylinder 8, a pressure sensing device 9, a first impeller 10, a first compression spring 11, a first gear 12, and a main shaft 13. The cylinder 8 is vertically and fixedly installed on the upper side of the pipe body 1 through a bracket 14. The pressure sensing device 9 is fixedly installed on the inner top of the cylinder 8. The turbine 6 is rotatably embedded in the inner wall of the pipe body 1. The gear ring 7 is fixedly installed on the side wall of the turbine 6. The first gear 12 is fixedly sleeved at the bottom end of the main shaft 13 and is meshed with the gear ring 7. The first impeller 10 is vertically slidably sleeved on the main shaft 13. A support ring 15 is rotatably embedded on the upper side of the first impeller 10. The first compression spring 11 is vertically sleeved on the upper side of the main shaft 13, and its upper and lower ends are respectively fixedly connected to the sensing end at the bottom side of the pressure sensing device 9 and the upper side of the support ring 15. Air holes 801 are formed in the rear side of the top of the cylinder 8. The pressure taking assembly is arranged in the inner upper side wall of the pipe body 1 and is connected to the main shaft 13 through a linkage component. Two pressure sensing display devices 24 are fixedly installed on the outer side of the pipe body 1 and are electrically connected between the two pressure sensing devices 9 respectively, for feeding back the pressure data of the two pressure sensing devices 9.

[0017] The pressure sensing device 9, the pressure sensing display device 24, and the circuit connection relationship between the two both belong to the prior art and will not be elaborated here.

[0018] A sealing shell 5 is fixedly installed on the upper side of the pipe body 1. The wedge mechanism is arranged in the sealing shell 5. The adjusting assembly includes a first screw 16, a truss 17, two sliding frames 18, two sliding rods 19, and two connecting plates 20. The truss 17 is vertically and fixedly installed on the upper side of the pipe body 1. The two sliding frames 18 are symmetrically and vertically arranged, and their tops are slidably embedded in the truss 17. The first screw 16 is horizontally rotatably sleeved in the truss 17. The two sliding frames 18 are both threadedly sleeved on the first screw 16. The end of the first screw 16 close to the input end penetrates through the sealing shell 5 and enters the cylinder 8. The two connecting plates 20 are respectively fixedly installed on the tops of the two baffles 4. The two sliding rods 19 are respectively horizontally and radially fixedly sleeved in the two connecting plates 20 and are respectively in sliding contact with the interiors of the two sliding frames 18.

[0019] The transmission component is arranged at the bottom side of the first impeller 10 at the input end and includes a snap ring 21, a first rack 22, and a second gear 23. The snap ring 21 is rotatably sleeved at the bottom of the first impeller 10. A clamping plate 25 is horizontally fixedly installed on the inner wall of the cylinder 8 at the input end. The first rack 22 is vertically slidably sleeved in the clamping plate 25, and its top end is fixedly connected to the bottom side of the snap ring 21. The second gear 23 is fixedly sleeved at the end of the first screw 16 and is meshed with the first rack 22.

[0020] The plugging component includes a sealing plate 26 and a magnetic block 27. A sliding cavity 28 is horizontally opened inside the top wall of the pipe body 1. The sealing plate 26 is horizontally and sealingly sleeved in the sliding cavity 28. The magnetic block 27 is fixedly installed on the bottom side of the baffle 4. One end of each of the two sealing plates 26 close to each other is adsorbed by the two magnetic blocks 27 respectively. During the deflection of the baffle 4, the two sealing plates 26 are always attracted by the magnetic blocks 27, and the two sealing plates 26 and the two baffles 4 seal and plug the socket 101.

[0021] The pressure-taking component includes a connecting pipe 29, a flexible pipe 30 and a pipe head 31. The connecting pipe 29 is fixedly sleeved inside the pipe body 1. The pipe head 31 is vertically arranged and connected to the linkage component. The top end of the pipe head 31 is fixedly connected and conducted with the input end of the connecting pipe 29 through the flexible pipe 30.

[0022] The linkage component includes a second screw 32, a slider 33, a second impeller 34, a third gear 35, a second rack 36, a cross plate 37, a pressure ring 38, a pull ring 39 and a second compression spring 40. A chute 41 is horizontally and symmetrically opened on the bottom side of the inner top wall of the pipe body 1. The slider 33 is horizontally slidably embedded in the chute 41. The second screw 32 is horizontally rotatably sleeved on the top of the pipe body 1 and penetrates through the chute 41. The third gear 35 is fixedly sleeved on the end of the second screw 32. The slider 33 is threadedly sleeved on the second screw 32. The pipe head 31 and the input end of the flexible pipe 30 are both fixedly sleeved inside the slider 33 and fixedly connected and conducted. The second impeller 34 is vertically slidably sleeved on the main shaft 13. The cross plate 37 is horizontally and fixedly installed on the inner wall of the cylinder body 8. The pressure ring 38 and the pull ring 39 are respectively rotatably sleeved on the upper and lower sides of the second impeller 34. The second compression spring 40 is vertically sleeved on the main shaft 13, and the upper and lower ends are respectively fixedly connected to the bottom of the cross plate 37 and the upper side of the pressure ring 38. The second rack 36 is vertically slidably sleeved inside the top wall of the pipe body 1, and the top end is fixedly connected to the pull ring 39. The third gear 35 is meshed with the second rack 36.

[0023] The opening angle of the wedge mechanism in the wedge-shaped flowmeter directly affects its performance and application scenarios. The specific impacts are as follows: Small opening angle: The wedge block is sharp. When the fluid flows through, the contraction is significant, and the generated differential pressure is large. It is more sensitive to low-flow-rate fluids and is suitable for low-flow measurement. Large opening angle: The fluid contraction is gentle, and the differential pressure is small. It is suitable for high-flow-rate scenarios, but the sensitivity may be insufficient at low flow rates.

[0024] When using this device for measurement, both ends of the pipe body 1 are connected to the conveying pipeline through the flange plates 3. When the fluid flows through the pipe body 1, under the interference of the wedge mechanism, a pressure difference is generated, so that the differential pressure device 2 measures its flow rate.

[0025] During the fluid flow process, the impact turbine 6 is impacted. The turbine 6 drives the gear ring 7 to rotate. The gear ring 7 drives the first gear 12 to rotate. The first gear 12 drives the main shaft 13 to rotate. The main shaft 13 drives the first impeller 10 to rotate. When the first impeller 10 rotates, lift is generated and it moves upward, compressing the first compression spring 11. At the same time, it drives the first rack 22 to move upward. The first rack 22 drives the second gear 23 to drive the first screw 16 to rotate.

[0026] Under the interference of the first compression spring 11, when the lift of the first impeller 10 is balanced with the elastic force of the first compression spring 11, the first impeller 10 remains at a certain height, so that the first screw 16 rotates a certain number of turns.

[0027] When the first screw 16 rotates, it drives the two slide carriages 18 to move away from each other, so that the two slide rods 19 move away from each other and move downward. Supported by the two support rods 401, the two baffles 4 deflect outward, increasing the opening angle of the wedge mechanism to adapt to the metering of fluids with higher flow rates. When the flow rate of the fluid decreases, the rotational speed of the turbine 6 decreases, so that the rotational speed of the main shaft 13 decreases, reducing the lift. The first impeller 10 moves downward, driving the first rack 22 to move downward, causing the first screw 16 to rotate in the reverse direction, making the two slide carriages 18 approach each other, so that the two baffles 4 deflect upward, reducing the opening angle of the two baffles 4 to adapt to the flow condition of the fluid with a low flow rate.

[0028] With the cooperation of the induction mechanism and the transmission components, the opening angle of the wedge structure formed by the two baffles 4 can be automatically adjusted according to the flow rate of the fluid, and it can be adjusted in real time as the flow rate changes, more fully ensuring the accuracy of metering.

[0029] When the first impeller 10 compresses the first compression spring 11, the elastic force of the first compression spring 11 acts on the pressure sensing device 9, converting the torque of the turbine 6 into pressure. When the flow rate of the fluid changes, the torque of the turbine 6 changes synchronously, so that the pressure value of the pressure sensing device 9 changes. Since the fluid velocity after passing through the wedge mechanism changes, the torques of the two turbines 6 are different. The pressure values of the two pressure sensing devices 9 can indirectly reflect the change in the pressure difference of the fluid. By comparing with the metering result of the differential pressure device 2, it can be judged whether the differential pressure device 2 is in a normal working state.

[0030] During the rotation of the main shaft 13, it synchronously drives the second impeller 34 to rotate. The second impeller 34 rotates synchronously, compressing the second compression spring 40. According to the torque of the turbine 6, different pneumatic lift forces are obtained, so as to move to different heights, driving the second rack 36 to move up and down. The up and down movement of the second rack 36 drives the third gear 35 to drive the second screw 32 to rotate. The second screw 32 drives the slider 33 to move, and the slider 33 drives the pipe head 31 to move for sampling, and transmits the sample to the differential pressure device 2 through the hose 30. According to the different opening angles of the wedge-shaped structure, the distance between the pipe head 31 and the wedge mechanism is adjusted. When the flow rate increases, the opening angle increases and the slider 33 moves away from the baffle 4. When the flow rate decreases, the opening angle decreases and the slider 33 approaches the baffle 4, so as to ensure that the sampling point is in the effective sampling area and avoid the influence of eddy current instability factors, further ensuring the accuracy of measurement.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wedge differential pressure flowmeter, comprising: A pipe body (1), a differential pressure device (2) and a wedge mechanism. The wedge mechanism is arranged on the upper side of the middle part of the pipe body (1). The differential pressure device (2) is fixedly installed on the side part of the pipe body (1), and pressure taking components are arranged on both sides of the differential pressure device (2). It is characterized in that: the wedge mechanism comprises two baffles (4), an adjusting component and two groups of plugging components. Induction mechanisms are arranged on both sides of the pipe body (1). The adjusting component is connected with the induction mechanism at the input end through a transmission component. An insertion opening (101) is formed in the upper side of the pipe body (1). The bottoms of the two baffles (4) are rotatably installed on the inner side wall of the pipe body (1) through support rods (401) and are both located in the insertion opening (101). The bottoms of the two baffles (4) are in rolling contact in a V shape, and the tops are both connected with the adjusting component. The induction mechanism comprises a turbine (6), a gear ring (7), a cylinder body (8), a pressure sensing device (9), a first impeller (10), a first compression spring (11), a first gear (12) and a main shaft (13). The cylinder body (8) is vertically and fixedly installed on the upper side of the pipe body (1) through a clamping frame (14). The pressure sensing device (9) is fixedly installed on the inner top of the cylinder body (8). The turbine (6) is rotatably embedded in the inner wall of the pipe body (1). The gear ring (7) is fixedly installed on the side wall of the turbine (6). The first gear (12) is fixedly sleeved at the bottom end of the main shaft (13) and is meshed with the gear ring (7). The first impeller (10) is vertically slidably sleeved on the main shaft (13). A support ring (15) is rotatably embedded on the upper side of the first impeller (10). The first compression spring (11) is vertically sleeved on the upper side of the main shaft (13), and the upper and lower ends are respectively fixedly connected with the bottom induction end of the pressure sensing device (9) and the upper side of the support ring (15). The pressure taking component is arranged in the upper side wall in the pipe body (1) and is connected with the main shaft (13) through a linkage component.

2. The wedge differential pressure flowmeter according to claim 1, wherein: A sealing shell (5) is fixedly installed on the upper side of the pipe body (1). The wedge mechanism is arranged in the sealing shell (5). The adjusting component comprises a first screw rod (16), a truss (17), two sliding frames (18), two sliding rods (19) and two connecting plates (20). The truss (17) is vertically and fixedly installed on the upper side of the pipe body (1). The two sliding frames (18) are symmetrically and vertically arranged, and the tops are both slidably embedded in the truss (17). The first screw rod (16) is horizontally rotatably sleeved in the truss (17). The two sliding frames (18) are both threadedly sleeved on the first screw rod (16). The end of the first screw rod (16) close to the input end penetrates through the sealing shell (5) and enters the cylinder body (8). The two connecting plates (20) are respectively fixedly installed on the tops of the two baffles (4). The two sliding rods (19) are respectively horizontally and radially fixedly sleeved in the two connecting plates (20) and are respectively in sliding contact with the interiors of the two sliding frames (18).

3. The wedge differential pressure flowmeter according to claim 2, characterized in that: The transmission component is arranged on the bottom side of the first impeller (10) located at the input end, and includes a snap ring (21), a first rack (22) and a second gear (23). The snap ring (21) is rotatably sleeved on the bottom of the first impeller (10). A clamping plate (25) is horizontally and fixedly installed on the inner wall of the cylinder body (8) at the input end. The first rack (22) is vertically and slidably sleeved in the clamping plate (25), and the top end thereof is fixedly connected to the bottom side of the snap ring (21). The second gear (23) is fixedly sleeved on the end of the first screw rod (16) and is meshed with the first rack (22).

4. A wedge differential pressure flowmeter according to claim 1, characterized in that: The plugging component includes a sealing plate (26) and a magnetic block (27). A sliding cavity (28) is horizontally opened inside the top wall of the pipe body (1). The sealing plate (26) is horizontally and sealingly slidably sleeved in the sliding cavity (28). The magnetic block (27) is fixedly installed on the bottom side of the baffle (4). One end of the two sealing plates (26) close to each other is respectively adsorbed by the two magnetic blocks (27).

5. A wedge differential pressure flowmeter according to claim 1, characterized in that: The pressure-taking assembly includes a connecting pipe (29), a flexible pipe (30) and a pipe head (31). The connecting pipe (29) is fixedly sleeved in the pipe body (1). The pipe head (31) is vertically arranged and is connected to the linkage component. The top end of the pipe head (31) is fixedly connected and communicated with the input end of the connecting pipe (29) through the flexible pipe (30).

6. The wedge differential pressure flowmeter according to claim 5, characterized in that: The linkage component includes a second screw rod (32), a slider (33), a second impeller (34), a third gear (35), a second rack (36), a cross plate (37), a pressing ring (38), a pulling ring (39) and a second compression spring (40). A chute (41) is horizontally and symmetrically opened on the bottom side of the inner top wall of the pipe body (1). The slider (33) is horizontally and slidably embedded in the chute (41). The second screw rod (32) is horizontally rotatably sleeved on the top of the pipe body (1) and penetrates through the chute (41). The third gear (35) is fixedly sleeved on the end of the second screw rod (32). The slider (33) is threadedly sleeved on the second screw rod (32). The pipe head (31) and the input end of the flexible pipe (30) are both fixedly sleeved in the slider (33) and are fixedly connected and communicated. The second impeller (34) is vertically slidably sleeved on the main shaft (13). The cross plate (37) is horizontally and fixedly installed on the inner wall of the cylinder body (8). The pressing ring (38) and the pulling ring (39) are respectively rotatably sleeved on the upper and lower sides of the second impeller (34). The second compression spring (40) is vertically sleeved on the main shaft (13), and the upper and lower ends thereof are respectively fixedly connected to the bottom of the cross plate (37) and the upper side of the pressing ring (38). The second rack (36) is vertically slidably sleeved in the top wall of the pipe body (1), and the top end thereof is fixedly connected to the pulling ring (39). The third gear (35) is meshed with the second rack (36).

7. A wedge differential pressure flowmeter according to claim 1, wherein: Two pressure sensing and displaying devices (24) are fixedly installed on the outer side of the pipe body (1) and are electrically connected between the two pressure sensing devices (9) respectively, for feeding back the pressure data of the two pressure sensing devices (9).

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