Self-adaptive adjusting type precession vortex flowmeter

Abstract

The invention discloses a self-adaptive adjusting type precession vortex flowmeter, and belongs to the field of flow detection. Comprising a shell and an axial adjusting mechanism, one side of the interior of a Venturi tube is fixedly connected with a flow guide cone tube, and the output end of the flow guide cone tube is provided with a three-stage extensible flow channel assembly which is used in cooperation with the axial adjusting mechanism to adapt to the change of the gas flow rate; by arranging the axial adjusting mechanism, the flow guide cone pipe and the three-stage extensible flow channel assembly, after high-pressure gas enters the shell, the cyclone device drives the axial adjusting mechanism to rotate, and a second-stage adjusting sleeve and a third-stage adjusting sleeve are pushed outwards through driving adjustment; along with the increase of the gas flow rate, the adjusting assembly gradually stretches the second-stage adjusting sleeve and the third-stage adjusting sleeve so that the second-stage adjusting sleeve and the third-stage adjusting sleeve can be expanded in the axial direction, the accelerated speed of gas in the contraction section of the Venturi tube is reduced through the expanded flow channel, the turbulence intensity is restrained, and the situation that the pressure loss of the fixed contraction section is too high is avoided; therefore, the stability of the detection signal is ensured and the accuracy of the whole flow detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flow detection, and more specifically, to an adaptive adjustment type precession vortex flowmeter. Background Art

[0002] The precession vortex flowmeter is a flow measurement instrument designed based on the fluid vortex precession effect. It captures the vortex rotation and axial precession phenomena generated when the fluid flows through the vortex generator, and converts the pressure fluctuation signal into flow data. With the advantages of no mechanical moving parts, wide range ratio, and long-term stability, this instrument has become the core equipment for natural gas, industrial gas, and liquid flow monitoring, and is widely used in the fields of petrochemical industry, urban gas transmission and distribution, and energy metering.

[0003] The existing precession vortex flowmeter mainly consists of a vortex generator, a Venturi tube, and a piezoelectric sensor. Its working principle depends on the formation of vortices by the fluid passing through the vortex generator, accelerating in the contraction section of the Venturi tube and triggering vortex precession. The piezoelectric sensor calculates the flow rate by detecting the linear relationship between the precession frequency and the flow velocity. However, during the process of measuring the gas transmission flow rate, due to the fixed contraction ratio of the Venturi tube and its inability to adapt to the change in flow velocity, the pressure loss of the fixed contraction section is too high under high-pressure gas conditions, ultimately resulting in distorted detection signals and deviation of results. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an adaptive adjustment type precession vortex flowmeter, aiming to solve the above technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An adaptive adjustment type precession vortex flowmeter, including a housing, wherein a Venturi tube is fixedly connected inside the housing, and a flowmeter is installed on the top of the housing. A cyclone and a swirl eliminator are respectively arranged at the air inlet end and the air outlet end of the Venturi tube. Tripods are fixedly connected to both end faces of the housing, and an axial adjustment mechanism for receiving the activities of the cyclone and the swirl eliminator is arranged inside the tripods. A guiding conical tube is fixedly connected to one side inside the Venturi tube, and a three-stage expandable flow channel assembly that is used in cooperation with the axial adjustment mechanism to adapt to the change in gas flow velocity is arranged at the output end of the guiding conical tube; Among them, the three-stage expandable flow channel assembly includes a main sleeve fixedly connected to the output end of the guiding conical tube. A secondary adjustment sleeve and a tertiary adjustment sleeve for buffering the gas flow velocity are sequentially arranged on the outer cylindrical surface of the main sleeve, and transmission components that are used in cooperation with the axial adjustment mechanism are respectively arranged on the inner walls of the secondary adjustment sleeve and the tertiary adjustment sleeve; The gas-driven cyclone and the axial adjustment mechanism rotate synchronously, and the transmission component is used to stretch the main sleeve, the secondary adjustment sleeve, and the tertiary adjustment sleeve, thereby changing the inner diameter contraction ratio of the Venturi tube to adapt to the change in gas flow rate.

[0007] As a further solution of the present invention: the axial adjustment mechanism includes a first receiving rod rotatably connected inside the tripod. An air cyclone is fixedly connected to the outer cylindrical surface of the first receiving rod. An impeller fixedly connected to the first receiving rod is arranged at the middle of the air cyclone and the flow guiding conical tube. One end of the first receiving rod is fixedly connected with a threaded rod, and a second receiving rod is arranged at the tail end of the threaded rod. A receiving sleeve is fixedly connected to one end surface of the second receiving rod close to the threaded rod, and a baffle is fixedly connected to one side of the threaded rod close to the receiving sleeve.

[0008] As a further solution of the present invention: the transmission component includes a first driving seat and a second driving seat respectively fixedly connected to one side of the inner walls of the secondary adjustment sleeve and the tertiary adjustment sleeve, and threaded rings meshing with the threaded rod are arranged inside the first driving seat and the second driving seat; first sliding rods are fixedly connected to the top and bottom of the outer cylindrical surface of the main sleeve, and the first sliding rods penetrate through the inside of the secondary adjustment sleeve to enable it to slide on the outer cylindrical surface of the main sleeve; second sliding rods are fixedly connected to the top and bottom of the outer cylindrical surface of the secondary adjustment sleeve, and the second sliding rods penetrate through the inside of the tertiary adjustment sleeve to enable it to slide on the outer cylindrical surface of the secondary adjustment sleeve; spring rings fixedly connected to the main sleeve are arranged on both sides of one end surface of the secondary adjustment sleeve.

[0009] As a further solution of the present invention: the threaded rod rotates to drive the first driving seat and the second driving seat to rotate, and enables the secondary adjustment sleeve and the tertiary adjustment sleeve to axially move along the first sliding rod and the second sliding rod respectively, thereby changing the inner diameter contraction ratio of the Venturi tube to adapt to the change in gas flow rate.

[0010] As a further solution of the present invention: annular plates are fixedly connected to both ends of the outer cylindrical surface of the housing, and threaded holes are formed inside the annular plates; flow pipes are arranged at both ports of the housing, and bolts and nuts are jointly arranged between the flow pipes and the annular plates.

[0011] As a further solution of the present invention: at the other ends of the first receiving rod and the second receiving rod, there are support mechanisms for providing support force to the circulation pipe. The support mechanism includes a screw rod fixedly connected to the other end of the first receiving rod. On the outer cylindrical surface of the screw rod, there is a fixed seat fixedly connected to the triangular frame. On one side of the outer surface of the triangular frame, there is a fixed plate fixedly connected. On one side of the outer surface of the fixed plate, there is a limiting rod in the same horizontal plane as the screw rod. On the outer cylindrical surface of the fixed seat, there is a support plate hinged. At one end surface of the support plate, there is a roller rotatably connected, and a silica gel leather sleeve is wrapped around the outer cylindrical surface of the roller. On the outer cylindrical surfaces of the screw rod and the limiting rod, there is an adjustment component for adjusting the opening and closing angle of the support plate.

[0012] As a further solution of the present invention: the adjustment component includes a threaded sleeve threadedly connected to the middle of the outer cylindrical surface of the screw rod. On one side of the outer cylindrical surface of the threaded sleeve, there is a sliding plate slidably connected to the limiting rod. Around the outer cylindrical surface of the threaded sleeve, there are support rods hinged to the support plate.

[0013] As a further solution of the present invention: on the outer cylindrical surfaces of the housing and the circulation pipe, there is a detection component for detecting the fastening degree of the connection end. The detection component includes an annular cover wrapped around the connection end of the housing and the circulation pipe. On one side of the outer surface of the annular cover, there is a T-shaped plate fixedly connected to the housing. Inside the T-shaped plate, there is a sensor embedded. On both sides of the connection end of the housing and the circulation pipe, there are tightening mechanisms. On the outer cylindrical surface of the housing, there is a transmission mechanism for driving the tightening mechanism to perform a tightening operation.

[0014] As a further solution of the present invention: the transmission mechanism includes a double-shaft servo motor fixedly connected to one side of the outer cylindrical surface of the housing. At the output ends of the double-shaft servo motor, there are driving rods fixedly connected. On the outer cylindrical surface of the driving rod, there is a first gear fixedly connected. On the outer surface of the first gear, there is an annular gear meshed. And the annular gear is sleeved on the housing. On the outer surface of the annular gear, there is a second gear meshed. Inside the second gear, there is a bidirectional threaded rod fixedly connected. At both ends of the bidirectional threaded rod, there are support seats fixedly connected to the housing.

[0015] As a further solution of the present invention: the tightening mechanism includes a fixed rod in the same horizontal plane as the driving rod. In the middle of the outer cylindrical surface of the fixed rod, there is an outer support plate fixedly connected to the housing. At both ends of the outer cylindrical surface of the fixed rod, there are sliding seats slidably connected. On the outer cylindrical surfaces of the driving rod and the bidirectional threaded rod, there are threaded seats threadedly connected. And between the threaded seat and the sliding seat, there is an L-shaped plate fixedly connected. On one side of the outer surface of the L-shaped plate, there is a tightening plate slidably connected to the driving rod.

[0016] The above technical solution provided by the present invention has at least the following beneficial effects compared with the prior art: (1) In this solution, by setting an axial adjustment mechanism, a diversion conical tube, and a three-stage expandable flow channel assembly, when high-pressure gas enters the housing, it first impacts the cyclone. The spiral blades rotate under the action of the gas thrust, generating a stable vortex flow field. The rotation of the cyclone drives the axial adjustment mechanism to rotate synchronously, and then drives the adjustment assembly to rotate synchronously, causing the secondary adjustment sleeve and the tertiary adjustment sleeve to be pushed outwards. As the gas flow rate increases, the adjustment assembly gradually stretches the secondary adjustment sleeve and the tertiary adjustment sleeve, causing them to expand axially. The expanded flow channel slows down the acceleration of the gas in the contraction section of the Venturi tube, suppresses the turbulence intensity, and keeps the vortex precession frequency linearly related to the flow rate, thereby improving the accuracy of the entire flow rate detection.

[0017] (2) By setting an axial adjustment mechanism, a diversion conical tube, and a three-stage expandable flow channel assembly, when high-pressure gas enters the housing, it impacts the spiral blades of the cyclone, causing the first receiving rod to drive the threaded rod to rotate. Since the thread ring in the first drive seat meshes with the threaded rod, the secondary adjustment sleeve is driven to slide outwards along the first slide rod, and the displacement stroke of the secondary adjustment sleeve is controlled by the number of rotation turns of the threaded rod. When the secondary adjustment sleeve moves to the preset stroke, the second drive seat continues to mesh with the threaded rod, pushing the tertiary adjustment sleeve to slide outwards along the second slide rod. During the outward movement of the secondary adjustment sleeve, the spring ring gradually releases the pre-tightening force, assisting the extension tube to extend stably and avoiding jamming.

[0018] (3) By setting an axial adjustment mechanism, a tripod, and a support mechanism, the rotation of the first receiving rod drives the lead screw to rotate synchronously, causing the threaded sleeve to rotate and move towards the fixed seat along the lead screw, driving the slide plate to slide along the limit rod. During the displacement of the slide plate, the support plate is pushed by the support rod to unfold around the hinge point of the fixed seat until the silicone sleeve of the roller contacts the inner wall of the flow pipe. Continuing to rotate the threaded sleeve, the support rod exerts a radial pressure on the support plate, causing the roller to tightly adhere to the flow pipe with a torque of 0.5 - 1.0 N·m, forming a flexible support (to avoid damage to the pipe due to hard contact). And when the main sleeve, secondary adjustment sleeve, and tertiary adjustment sleeve expand, resulting in a change in the axial length of the Venturi tube, the support plate adapts to the displacement of the flow pipe through the rolling of the roller, avoiding stress concentration in the pipe. Description of the Drawings

[0019] The drawings incorporated herein and constituting part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is an internal cross-sectional view of the housing of the present invention; Figure 3Schematic diagram of the split connection between the support mechanism and the housing of the present invention; Figure 4 Internal sectional view of the Venturi tube of the present invention; Figure 5 Connection schematic diagram of the axial adjustment mechanism of the present invention; Figure 6 Connection schematic diagram of the flow guiding conical tube and the three-stage expandable flow channel assembly of the present invention; Figure 7 Internal connection schematic diagram of the three-stage expandable flow channel assembly of the present invention; Figure 8 Connection schematic diagram of the transmission mechanism and the tightening mechanism of the present invention.

[0021] Reference numerals: 1. Housing; 2. Venturi tube; 3. Flow meter; 4. Tripod; 5. Axial adjustment mechanism; 51. First receiving rod; 52. Second receiving rod; 53. Receiving sleeve; 54. Threaded rod; 55. Baffle; 6. Cyclone; 7. Anti-rotator; 8. Impeller; 9. Flow guiding conical tube; 10. Three-stage expandable flow channel assembly; 101. Main sleeve; 102. Secondary adjustment sleeve; 103. Tertiary adjustment sleeve; 104. First sliding rod; 105. Second sliding rod; 106. First driving seat; 107. Second driving seat; 108. Spring ring; 11. Flow through pipe; 12. Support mechanism; 121. Lead screw; 122. Limit rod; 123. Fixed seat; 124. Support plate; 125. Roller; 126. Threaded sleeve; 127. Slide plate; 128. Support rod; 13. Fixed plate; 14. Detection assembly; 141. Ring-shaped cover; 142. T-shaped plate; 143. Sensor; 15. Transmission mechanism; 151. Biaxial servo motor; 152. Driving rod; 153. First gear; 154. Ring gear; 155. Second gear; 156. Bidirectional threaded rod; 16. Tightening mechanism; 161. Fixed rod; 162. Outer support plate; 163. Threaded seat; 164. Slide seat; 165. L-shaped plate; 166. Tightening plate.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0023] The following will describe in detail an adaptive adjustment type precession vortex flowmeter provided by the present invention in combination with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0024] As Figures 1 to 8 shown, an embodiment of the present invention provides an adaptive adjustment type precession vortex flowmeter, including a housing 1. A Venturi tube 2 is fixedly connected inside the housing 1, and a flowmeter 3 is installed on the top of the housing 1. A cyclone 6 and a swirl eliminator 7 are respectively arranged at the air inlet end and the air outlet end of the Venturi tube 2. Tripods 4 are fixedly connected to both end faces of the housing 1, and an axial adjustment mechanism 5 for receiving the activities of the cyclone 6 and the swirl eliminator 7 is arranged inside the tripod 4. A guide cone tube 9 is fixedly connected to one side inside the Venturi tube 2, and a three-stage expandable flow channel assembly 10 that cooperates with the axial adjustment mechanism 5 to adapt to the change of gas flow rate is arranged at the output end of the guide cone tube 9; Among them, the three-stage expandable flow channel assembly 10 includes a main sleeve 101 fixedly connected to the output end of the guide cone tube 9. A secondary adjustment sleeve 102 and a tertiary adjustment sleeve 103 for buffering the gas flow rate are sequentially arranged on the outer cylindrical surface of the main sleeve 101, and transmission components that cooperate with the axial adjustment mechanism 5 are respectively arranged on the inner walls of the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103; The cyclone 6 and the axial adjustment mechanism 5 are synchronously rotated by gas drive, and the main sleeve 101, the secondary adjustment sleeve 102, and the tertiary adjustment sleeve 103 are stretched by using the transmission components, so as to change the inner diameter shrinkage ratio of the Venturi tube 2 to adapt to the change of gas flow rate.

[0025] In order to solve the problem that in the existing vortex flowmeter under high-pressure gas conditions, due to the fixed contraction ratio of the Venturi tube, the flow channel cross-sectional area cannot be dynamically adjusted according to the gas flow rate, resulting in excessive pressure loss in the fixed contraction section, which ultimately causes distortion of the detection signal and result deviation, the above-mentioned technical solution is now adopted to solve the problem. The above-mentioned technical solution is mainly composed of an axial adjustment mechanism 5, a guide cone tube 9, and a three-stage expandable flow channel assembly 10. When in use, the shell 1 is fastened to the external gas delivery pipe by bolts and nuts. At this time, the flow channel of the Venturi tube 2 is in an initial contraction state, and the main sleeve 101, the secondary adjustment sleeve 102, and the tertiary adjustment sleeve 103 are sequentially nested in the outlet end of the guide cone tube 9, and the adjustment assembly between each extension tube is in a contracted position, and the flow channel cross-sectional area is the minimum design value. When the high-pressure gas enters the shell 1, it first impacts the cyclone 6, and its spiral blades rotate under the action of gas thrust to generate a stable vortex flow field; the rotation of the cyclone 6 drives the axial adjustment mechanism 5 to rotate synchronously, and then drives the adjustment component to rotate synchronously, and pushes the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 outward; as the gas flow rate increases, the adjustment component gradually stretches the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 to expand axially. For example, when the flow rate reaches 10m / s, the secondary adjustment sleeve 102 extends outward to 50% of the preset stroke, the tertiary adjustment sleeve 103 extends to 30%, and the flow channel cross-sectional area expands to 1.8 times the initial value; when the flow rate further increases to 20m / s, the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 are fully expanded, and the cross-sectional area expands to 2.5 times the initial value, effectively reducing the flow channel contraction ratio. During the above operation, the expanded flow channel slows down the acceleration of the gas in the contraction section of the Venturi tube 2, suppresses the turbulence intensity, maintains a linear relationship between the vortex precession frequency and the flow velocity, and avoids excessive pressure loss in the fixed contraction section, thereby ensuring the stability of the detection signal and improving the accuracy of the entire flow detection; and the main sleeve 101, the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 are all coated with tungsten carbide, combined with the flow velocity adaptive adjustment, to reduce the wear of the inner wall of the flow channel by high-speed particles.

[0026] like Figure 4 , Figure 5 As shown, the axial adjustment mechanism 5 includes a first receiving rod 51 rotatably connected to the inside of the tripod 4, the outer cylindrical surface of the first receiving rod 51 is fixedly connected to the cyclone 6, and an impeller 8 fixedly connected to the first receiving rod 51 is arranged in the middle of the cyclone 6 and the guide cone tube 9, one end of the first receiving rod 51 is fixedly connected to a threaded rod 54, and the tail end of the threaded rod 54 is provided with a second receiving rod 52, the end face of the second receiving rod 52 close to the threaded rod 54 is fixedly connected to a receiving sleeve 53, and the side of the threaded rod 54 close to the receiving sleeve 53 is fixedly connected to a baffle 55.

[0027] like Figure 6 , Figure 7As shown in the figure, the transmission assembly includes a first drive seat 106 and a second drive seat 107 respectively and fixedly connected to one side of the inner walls of the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103, and threaded rings meshing with the threaded rod 54 are arranged inside the first drive seat 106 and the second drive seat 107; both the top and the bottom of the outer cylindrical surface of the main sleeve 101 are fixedly connected with first sliding rods 104, and the first sliding rods 104 penetrate through the inside of the secondary adjustment sleeve 102 to enable it to slide on the outer cylindrical surface of the main sleeve 101; both the top and the bottom of the outer cylindrical surface of the secondary adjustment sleeve 102 are fixedly connected with second sliding rods 105, and the second sliding rods 105 penetrate through the inside of the tertiary adjustment sleeve 103 to enable it to slide on the outer cylindrical surface of the secondary adjustment sleeve 102; spring rings 108 fixedly connected to the main sleeve 101 are arranged on both sides of one end face of the secondary adjustment sleeve 102.

[0028] As Figure 6 , Figure 7 shown in the figure, the threaded rod 54 rotates to drive the first drive seat 106 and the second drive seat 107 to rotate, and enables the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 to axially move outward along the first sliding rod 104 and the second sliding rod 105 respectively, so as to change the inner diameter shrinkage ratio of the Venturi tube 2 to adapt to the change of gas flow rate.

[0029] Before the gas enters the Venturi tube 2, the main sleeve 101, the secondary adjustment sleeve 102, and the tertiary adjustment sleeve 103 are in a nested and contracted form, and the spring coil 108 is in a compressed state. When high-pressure gas enters the housing 1, it impacts the spiral blades of the cyclone 6, driving it to rotate around the first connecting rod 51, and at the same time driving the coaxially fixed impeller 8 to rotate synchronously. The rotation of the impeller 8 further strengthens the axial precession of the gas vortex, and the rotation of the cyclone 6 is transmitted to the threaded rod 54 through the first connecting rod 51. The threaded rod 54 and the second connecting rod 52 are linked through the connecting sleeve 53, and the baffle 55 restricts the axial displacement of the threaded rod 54 to ensure that it only rotates. During the rotation of the threaded rod 54, the thread ring in the first drive seat 106 meshes with the threaded rod 54, driving the secondary adjustment sleeve 102 to slide outward along the first slide rod 104, and the displacement stroke of the secondary adjustment sleeve 102 is controlled by the number of rotation turns of the threaded rod 54. When the secondary adjustment sleeve 102 moves to the preset stroke, the second drive seat 107 continues to mesh with the threaded rod 54, pushing the tertiary adjustment sleeve 103 to slide outward along the second slide rod 105. During the outward movement of the secondary adjustment sleeve 102, the spring coil 108 gradually releases the pre-tightening force to assist the extension tube to stably extend and avoid jamming. When the gas flow rate is low, only the secondary adjustment sleeve 102 partially unfolds, and the flow channel cross-sectional area expands to 1.5 times the initial value, and the contraction ratio drops to 0.4; when the gas flow rate gradually increases, the secondary adjustment sleeve 102 and the tertiary adjustment sleeve 103 unfold synchronously, and the cross-sectional area expands to 2.2 times the initial value, and the contraction ratio is adjusted to 0.3; when the flow rate is in the high-speed working condition, the tertiary adjustment sleeve 103 fully unfolds, and the cross-sectional area reaches 2.8 times the initial value, and the contraction ratio drops to 0.2, significantly reducing the turbulence intensity. The adjusted gas enters the de-swirl device 7 after being rectified by the guide cone tube 9. Its honeycomb structure eliminates the residual vortex, and the piezoelectric sensor detects the stable pressure fluctuation signal, and the flowmeter 3 displays the high-precision flow data in real time. During the above operation process, through the gradient unfolding of the main sleeve 101, the secondary adjustment sleeve 102, and the tertiary adjustment sleeve 103 in sequence, the contraction ratio of the Venturi tube 2 is adaptively adjusted from 0.5 (initial) to 0.2 (maximum flow rate), significantly reducing the local pressure loss, and the dynamic adjustment of the flow channel cross-sectional area suppresses the vortex breakage caused by high-speed turbulence, thereby improving the accuracy of the entire flow monitoring.

[0030] As Figure 1 , Figure 2 , Figure 3 shown, annular plates are fixedly connected to both ends of the outer circular surface of the housing 1, and threaded holes are provided inside the annular plates; flow pipes 11 are provided at both ports of the housing 1, and bolts and nuts are provided between the flow pipes 11 and the annular plates.

[0031] As Figure 2 , Figure 3As shown in the figure, support mechanisms 12 for providing support force to the flow pipe 11 are provided at the other ends of the first receiving rod 51 and the second receiving rod 52. The support mechanism 12 includes a lead screw 121 fixedly connected to the other end of the first receiving rod 51. A fixed seat 123 fixedly connected to the triangular frame 4 is provided on the outer cylindrical surface of the lead screw 121. One side of the outer surface of the triangular frame 4 is fixedly connected with a fixing plate 13. A limiting rod 122 on the same horizontal plane as the lead screw 121 is fixedly connected to one side of the outer surface of the fixing plate 13. A support plate 124 is hinged on the outer cylindrical surface of the fixed seat 123. One end face of the support plate 124 is rotatably connected with a roller 125, and a silica gel leather sleeve is wrapped around the outer cylindrical surface of the roller 125. An adjusting assembly for adjusting the opening and closing angle of the support plate 124 is provided on the outer cylindrical surfaces of the lead screw 121 and the limiting rod 122 together.

[0032] As Figure 3 shown, the adjusting assembly includes a threaded sleeve 126 threadedly connected to the middle of the outer cylindrical surface of the lead screw 121. A sliding plate 127 slidably connected to the limiting rod 122 is provided on one side of the outer cylindrical surface of the threaded sleeve 126. Struts 128 hingedly connected to the support plate 124 are arranged around the outer cylindrical surface of the threaded sleeve 126.

[0033] Align the annular plates at both ends of the housing 1 with the external flow pipe 11 and fasten them with bolts and nuts. At this time, the axis of the flow pipe 11 coincides with the flow path center line of the Venturi tube 2 to ensure that there is no partial load in the gas flow. After the high-pressure gas enters the housing 1, it impacts the spiral blades of the cyclone 6, driving it to rotate around the first receiving rod 51, and simultaneously driving the coaxial fixed impeller 8 to rotate synchronously. The rotation of the first receiving rod 51 drives the lead screw 121 to rotate synchronously, so that the threaded sleeve 126 rotates and moves along the lead screw 121 towards the fixed seat 123, driving the sliding plate 127 to slide along the limiting rod 122. During the displacement of the sliding plate 127, the support plate 124 is pushed by the strut 128 to unfold around the hinge point of the fixed seat 123 until the silica gel leather sleeve of the roller 125 contacts the inner wall of the flow pipe 11. Continuing to rotate the threaded sleeve 126, the strut 128 exerts a radial pressure on the support plate 124, making the roller 125 tightly adhere to the flow pipe 11 with a torque of 0.5 - 1.0 N·m to form a flexible support (to avoid damaging the pipeline due to hard contact). And during the selection of the first receiving rod 51, it is transmitted to the first driving seat 106 and the second driving seat 107 through the threaded rod 54, driving the secondary adjusting sleeve 102 and the tertiary adjusting sleeve 103 to slide outwards along the first sliding rod 104 and the second sliding rod 105, and the cross-sectional area of the Venturi tube 2 expands to 2.5 times the initial value, effectively reducing the flow path contraction ratio. When the axial length of the Venturi tube 2 changes due to the expansion of the main sleeve 101, the secondary adjusting sleeve 102, and the tertiary adjusting sleeve 103, the support plate 124 adapts to the displacement of the flow pipe 11 through the rolling of the roller 125, avoiding pipeline stress concentration.

[0034] As Figure 1, Figure 8 As shown in the figure, a detection assembly 14 for detecting the fastening degree of the connection end is jointly provided on the outer circumferential surface of the housing 1 and the flow pipe 11. The detection assembly 14 includes an annular cover 141 wrapped around the connection end of the housing 1 and the flow pipe 11. One side of the outer surface of the annular cover 141 is provided with a T-shaped plate 142 fixedly connected to the housing 1, and a sensor 143 is embedded inside the T-shaped plate 142; tightening mechanisms 16 are provided on both sides of the connection end of the housing 1 and the flow pipe 11, and a transmission mechanism 15 for driving the tightening mechanism 16 to perform a tightening operation is provided on the outer circumferential surface of the housing 1.

[0035] As Figure 1 , Figure 8 shown in the figure, the transmission mechanism 15 includes a dual-axis servo motor 151 fixedly connected to one side of the outer circumferential surface of the housing 1. Output ends of the dual-axis servo motor 151 are fixedly connected with drive rods 152 respectively. A first gear 153 is fixedly connected to the outer circumferential surface of the drive rod 152. An annular gear 154 is meshed with the outer surface of the first gear 153, and the annular gear 154 is sleeved on the housing 1. A second gear 155 is meshed with the outer surface of the annular gear 154. A bidirectional threaded rod 156 is fixedly connected inside the second gear 155, and support seats fixedly connected to the housing 1 are arranged at both ends of the bidirectional threaded rod 156.

[0036] As Figure 1 , Figure 8 shown in the figure, the tightening mechanism 16 includes a fixed rod 161 in the same horizontal plane as the drive rod 152. An outer support plate 162 fixedly connected to the housing 1 is arranged at the middle of the outer circumferential surface of the fixed rod 161. Slide seats 164 are slidably connected to both ends of the outer circumferential surface of the fixed rod 161. Threaded seats 163 are threadedly connected to the outer circumferential surfaces of the drive rod 152 and the bidirectional threaded rod 156 respectively. An L-shaped plate 165 is fixedly connected between the threaded seat 163 and the slide seat 164. A tightening plate 166 slidably connected to the drive rod 152 is arranged on one side of the outer surface of the L-shaped plate 165.

[0037] Since the traditional bolt fastening depends on the experience of workers and the pre-tightening force is uneven, it is easy to cause local over-tightening (bolt fracture) or over-loosening (leakage); now, the housing 1 and the flow pipe 11 for gas transmission are preliminarily fastened by bolts, and then the tightening plate 166 and the L-shaped plate 165 are fixed by bolts. At this time, the annular cover 141 of the detection component 14 wraps around the connection, and the internal sensor 143 optical fiber strain gauge monitors the circumferential deformation of the annular cover 141 in real time. When the sensor 143 detects that the local deformation of the annular cover 141 exceeds the threshold, it is determined that the bolt pre-tightening force is insufficient, and the transmission mechanism 15 is triggered to start, that is, the dual-axis servo motor 151 starts, driving the two drive rods 152 to rotate synchronously. However, the thread circles opened on the outer cylindrical surfaces of the two drive rods 152 are opposite. Therefore, when the dual-axis servo motor 151 rotates forward and backward, the tightening mechanism 16 moves synchronously inward or outward on the drive rods 152. During the rotation of the drive rod 152, the fixedly connected first gear 153 is driven to rotate; and because the first gear 153 meshes with the annular gear 154, the power is transmitted to the second gear 155, and the second gear 155 drives the bidirectional threaded rod 156 to rotate; and the rotation of the bidirectional threaded rod 156 drives the two threaded seats 163 to move towards the center, and through the L-shaped plate 165, the sliding seat 164 is pushed to slide along the fixed rod 161, driving the tightening plate 166 to apply a radial auxiliary torque to the flange bolt. During the tightening process of the housing 1 and the flow pipe 11, the sensor 143 continuously monitors the deformation of the annular cover 141. When the deformation amount drops to the safe range, a feedback signal is sent to the dual-axis servo motor 151 to stop running, completing the pre-tightening force compensation. In the whole operation process, the deformation is monitored in real time by the sensor 143, and the dual-axis servo motor 151 drives the tightening mechanism 16 to apply an accurate torque to ensure that the connection end is evenly pressed.

[0038] When the present invention is in use, first, the housing 1 is flange-connected to the external flow pipe 11 through the annular plates at both ends. After the bolts are preliminarily tightened, the flow channel of the Venturi tube 2 is in the minimum contraction state. Then, when high-pressure gas enters the housing 1, it impacts the spiral blades of the cyclone 6, driving it to rotate around the first receiving rod 51, and at the same time driving the coaxial impeller 8 to strengthen the vortex precession. The rotation of the cyclone 6 is transmitted to the threaded rod 54 through the first receiving rod 51. The threaded rod 54 and the second receiving rod 52 are linked through the receiving sleeve 53. The baffle 55 restricts the axial displacement of the threaded rod 54 to ensure that it only makes rotational motion. When the threaded rod 54 rotates, the thread ring in the first driving seat 106 meshes with the threaded rod 54, driving the secondary adjusting sleeve 102 to slide outward along the first sliding rod 104, and the displacement stroke of the secondary adjusting sleeve 102 is controlled by the number of rotation turns of the threaded rod 54. When the secondary adjusting sleeve 102 moves to the preset stroke, the second driving seat 107 continues to mesh with the threaded rod 54, pushing the tertiary adjusting sleeve 103 to slide outward along the second sliding rod 105. And during the process of the secondary adjusting sleeve 102 moving outward, the spring ring 108 gradually releases the pre-tightening force to assist the extension tube to stably extend and avoid jamming. When the gas flow rate is low, only the secondary adjusting sleeve 102 is partially unfolded, and the flow channel cross-sectional area expands to 1.5 times the initial value, and the contraction ratio drops to 0.4. When the gas flow rate gradually increases, the secondary adjusting sleeve 102 and the tertiary adjusting sleeve 103 are unfolded synchronously, and the cross-sectional area expands to 2.2 times the initial value, and the contraction ratio is adjusted to 0.3. When the flow rate is in the high-speed working condition, the tertiary adjusting sleeve 103 is completely unfolded, and the cross-sectional area reaches 2.8 times the initial value, and the contraction ratio drops to 0.2, significantly reducing the turbulence intensity. The adjusted gas enters the de-swirl device 7 after being rectified by the guide cone tube 9. Its honeycomb structure eliminates the residual vortex, and the piezoelectric sensor detects a stable pressure fluctuation signal, and the flow meter 3 outputs high-precision flow data in real time. And during the rotation of the cyclone 6, it drives the lead screw 121 to rotate, driving the threaded sleeve 126 to slide along the limiting rod 122, and pushing the support plate 124 to unfold through the support rod 128, and the roller 125 flexibly clamps the flow pipe 11 with torque. When the axial displacement of the Venturi tube 2 is caused by the expansion of the flow channel, the roller 125 rolls to compensate for the displacement to avoid pipeline stress concentration. And because the annular cover 141 of the detection component 14 wraps the connection part, the circumferential deformation is monitored in real time by using the fiber optic strain gauge inside the inductor 143. When the deformation amount exceeds the threshold value, it triggers the transmission mechanism 15 to start: the biaxial servo motor 151 drives the driving rods 152 on both sides to rotate, and through the transmission of the first gear 153, the annular gear 154, and the second gear 155, it drives the bidirectional threaded rod 156 to rotate, driving the threaded seat 163 to move towards the center. Then, the L-shaped plate 165 is used to push the sliding seat 164 to slide, and the tightening plate 166 applies a radial auxiliary torque to the flange bolts until the deformation amount returns to the safe range.

[0039] The present invention covers any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, well-known methods, processes, procedures, components and circuits are not described in detail in order to avoid unnecessary confusion to the essence of the present invention.

[0040] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An adaptive adjustment type vortex flowmeter, comprising a housing, a venturi tube is fixedly connected to the inside of the housing, and a flowmeter is installed on the top of the housing; characterized in that: The air inlet and outlet ends of the venturi tube are respectively provided with a cyclone decyclone, and both end surfaces of the shell are fixedly connected with a tripod, and the inside of the tripod is provided with an axial adjustment mechanism for receiving the activities of the cyclone and the decyclone, and one side of the inside of the venturi tube is fixedly connected with a guide cone tube, and the output end of the guide cone tube is provided with a three-stage expandable flow channel component used in conjunction with the axial adjustment mechanism to adapt to changes in gas flow rate; Among them, the three-stage expandable flow channel assembly includes a main sleeve fixedly connected to the output end of the guide cone tube, and the outer circumferential surface of the main sleeve is sequentially provided with a secondary adjustment sleeve and a tertiary adjustment sleeve for buffering the gas flow rate, and the inner walls of the secondary adjustment sleeve and the tertiary adjustment sleeve are respectively provided with a transmission assembly used in conjunction with the axial adjustment mechanism; The cyclone and the axial adjustment mechanism are driven by gas to rotate synchronously, and the main sleeve, the secondary adjustment sleeve and the tertiary adjustment sleeve are stretched by the transmission assembly, thereby changing the inner diameter contraction ratio of the Venturi tube to adapt to the change of gas flow rate.

2. The self-adaptive swirl flowmeter according to claim 1, characterized in that: The axial adjustment mechanism includes a first receiving rod rotatably connected to the inside of the tripod, the outer cylindrical surface of the first receiving rod is fixedly connected to a cyclone, an impeller fixedly connected to the first receiving rod is arranged in the middle of the cyclone and the guide cone tube, one end of the first receiving rod is fixedly connected to a threaded rod, and a second receiving rod is arranged at the tail end of the threaded rod, an end surface of the second receiving rod close to the threaded rod is fixedly connected to a receiving sleeve, and a baffle is fixedly connected to a side of the threaded rod close to the receiving sleeve.

3. The self-adaptive swirl flowmeter according to claim 2, characterized in that: The transmission assembly includes a first drive seat and a second drive seat which are respectively fixedly connected to one side of the inner wall of the secondary adjustment sleeve and the tertiary adjustment sleeve, and the first drive seat and the second drive seat are both provided with threaded rings meshing with the threaded rod; the top and the bottom of the outer circumferential surface of the main sleeve are fixedly connected with the first slide bar, and the first slide bar penetrates the interior of the secondary adjustment sleeve so that it can slide on the outer circumferential surface of the main sleeve; the top and the bottom of the outer circumferential surface of the secondary adjustment sleeve are fixedly connected with the second slide bar, and the second slide bar penetrates the interior of the tertiary adjustment sleeve so that it can slide on the outer circumferential surface of the secondary adjustment sleeve; both sides of one end surface of the secondary adjustment sleeve are provided with spring rings fixedly connected to the main sleeve.

4. The self-adaptive swirl flowmeter according to claim 3, characterized in that: The threaded rod rotates to drive the first drive seat and the second drive seat to rotate, and the secondary adjustment sleeve and the tertiary adjustment sleeve move outward along the first slide rod and the second slide rod axis respectively, thereby changing the inner diameter contraction ratio of the Venturi tube to adapt to the change in gas flow rate.

5. The self-adaptive swirl flowmeter according to claim 4, characterized in that: Both ends of the outer cylindrical surface of the shell are fixedly connected with annular plates, and threaded holes are opened inside the annular plates; both ends of the shell are provided with flow pipes, and bolts and nuts are commonly provided between the flow pipes and the annular plates.

6. The self-adaptive swirl flowmeter according to claim 5, characterized in that: The other ends of the first supporting rod and the second supporting rod are both provided with a supporting mechanism for increasing the supporting force of the circulation pipe, the supporting mechanism includes a screw rod fixedly connected to the other end of the first supporting rod, a fixing seat fixedly connected to the tripod is provided on the outer circular surface of the screw rod, and a fixing plate is fixedly connected to one side of the outer surface of the tripod, a limiting rod which is fixedly connected to the same horizontal plane as the screw rod on one side of the outer surface of the fixing plate, a supporting plate is hingedly connected to the outer circular surface of the fixing seat, a roller is rotatably connected to one end surface of the support plate, and the outer circular surface of the roller is wrapped with a silicone leather cover, and an adjusting component for adjusting the opening and closing angle of the support plate is jointly provided on the outer circular surfaces of the screw rod and the limiting rod.

7. The self-adaptive swirl flowmeter according to claim 6, characterized in that: The adjusting assembly includes a threaded sleeve threadedly connected to the middle of the outer cylindrical surface of the screw rod, and a slide plate slidably connected to the limit rod is arranged on one side of the outer cylindrical surface of the threaded sleeve, and a support rod hingedly connected to the support plate is arranged around the outer cylindrical surface of the threaded sleeve.

8. The self-adaptive regulating vortex flowmeter according to claim 7, characterized in that: The outer circumferential surfaces of the shell and the circulation tube are jointly provided with a detection component for detecting the tightness of the connection end, and the detection component includes an annular cover wrapped around the connection end of the shell and the circulation tube, and a T-shaped plate fixedly connected to the shell is provided on one side of the outer surface of the annular cover, and a sensor is embedded in the interior of the T-shaped plate; tightening mechanisms are provided on both sides of the connection end of the shell and the circulation tube, and a transmission mechanism for driving the tightening mechanism to perform tightening operations is provided on the outer circumferential surface of the shell.

9. The self-adaptive swirl flowmeter according to claim 8, characterized in that: The transmission mechanism includes a dual-axis servo motor fixedly connected to one side of the outer cylindrical surface of the shell, the output ends of the dual-axis servo motors are fixedly connected to drive rods, the outer cylindrical surface of the drive rods is fixedly connected to a first gear, the outer surface of the first gear is meshed with a ring gear, and the ring gear is sleeved on the shell, the outer surface of the ring gear is meshed with a second gear, the interior of the second gear is fixedly connected to a bidirectional threaded rod, and both ends of the bidirectional threaded rod are provided with support seats fixedly connected to the shell.

10. The self-adaptive swirl flowmeter according to claim 9, characterized in that: The tightening mechanism includes a fixed rod which is in the same horizontal plane as the driving rod, an outer support plate fixedly connected to the shell is arranged in the middle of the outer cylindrical surface of the fixed rod, both ends of the outer cylindrical surface of the fixed rod are slidably connected with sliding seats, the driving rod and the outer cylindrical surfaces of the bidirectional threaded rod are threadedly connected with threaded seats, and an L-shaped plate is fixedly connected between the threaded seat and the sliding seat, and a tightening plate slidably connected to the driving rod is arranged on one side of the outer surface of the L-shaped plate.

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