Anti-vibration vortex shedding flowmeter

Abstract

The invention discloses an anti-vibration vortex shedding flowmeter, and relates to the technical field of flowmeters. According to the invention, the flow is detected through eddy current and pressure change, and high measurement precision can still be maintained in an external vibration environment. By arranging a pressure adjusting ring and a deformation rubber ring, optimized detection of the low-flow-speed environment is achieved. In addition, an electromagnetic limiting structure is designed to avoid misoperation, meanwhile, the flow can be dynamically adjusted, and adaptability and measurement reliability are improved. The invention is suitable for various flow ranges, and especially shows superiority in a vibration environment and a low flow velocity condition.

Description

Technical Field

[0001] The invention relates to the technical field of flowmeters, in particular to a vibration-resistant vortex flowmeter. Background Art

[0002] In the prior art, traditional vortex flowmeters mainly determine the fluid flow rate and flow rate by monitoring the vibration frequency of the vortex generator. When the fluid flows through the vortex generator, vortices are generated alternately on both sides, and the vortex generation frequency is linearly related to the flow rate. Traditional equipment uses a vibration sensor to record the vibration frequency of the vortex generator and converts the vibration frequency into flow data through signal processing. However, this detection method has significant defects in application: it is highly sensitive to external vibrations. Because the vibration of the vortex generator is not only affected by the generation of vortex, but also by external factors such as mechanical vibrations in the pipeline environment, resonance generated by the operation of surrounding equipment, and vibrations conducted by the ground. These non-fluid factors may cause the signal captured by the sensor to be distorted, causing the measurement results to deviate from the actual flow rate, especially when the vibration frequency is close to the vortex frequency, the interference is particularly obvious. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a vibration-resistant vortex flowmeter, comprising an intermediate pipe, a vortex generator is arranged at the central position inside the intermediate pipe, the vortex generator is arranged along the radial direction of the intermediate pipe, and a connecting circular hole is also opened on the intermediate pipe, and a vibration frequency monitoring component is fixedly and sealed at the connecting circular hole, and the vibration frequency monitoring component is used to monitor and display the vibration frequency of the vortex generator; two parallel detection pressure tubes are arranged on the side of the vortex generator, the two detection pressure tubes are fixedly installed on the sealing plug, and an embedded groove hole is also opened on the intermediate pipe, wherein the sealing plug is fixedly sealed in the embedded groove hole, and the bottom ends of the two detection pressure tubes are arranged at the center of the intermediate pipe.

[0004] Preferably, two balancing pressure tubes are inserted and embedded in the intermediate pipe, one end of the two balancing pressure tubes is located inside the intermediate pipe and is flush with the inner wall surface of the intermediate pipe, the balancing pressure tube is the same as the inside of the intermediate pipe, the two balancing pressure tubes are fixed on the balancing pressure tube bracket, the two balancing pressure tubes and the two detection pressure tubes are arranged one by one, and each two corresponding balancing pressure tubes and the detection pressure tubes have piston rods inserted in a sliding seal at the opposite ends, the balancing pressure tube bracket and the outer side of the balancing pressure tube are provided with a protective shell, and the protective shell is fixed on the intermediate pipe.

[0005] Preferably, a pressure plate is fixed in the middle of the two piston rods, and the upper and lower surfaces of the two pressure plates are both equipped with pressure sensors. A pressure sensor limiting frame is also fixed on the middle pipe. The pressure sensor limiting frame wraps up the four pressure sensors to limit the displacement of the pressure plates so that the pressure sensors are in contact and cooperate with the pressure sensor limiting frame.

[0006] Preferably, connecting sealing rings are fixed at both ends of the intermediate pipe, a flange is fixedly installed on the side of the connecting sealing ring through an adjusting pressure ring, a deformable rubber ring is fixedly sealed on the inner side of the adjusting pressure ring, and each adjusting pressure ring is fixedly connected to a pressure delivery pipe, the two pressure delivery pipes are connected by a three-way connecting pipe, and a flow regulating valve is arranged in series on each pressure delivery pipe.

[0007] Preferably, an adjusting cylinder is fixedly installed on the intermediate pipe through an adjusting cylinder bracket, an extrusion piston is slidingly sealed on the inner wall of the adjusting cylinder, a screw rod is fixed at an eccentric position on the side of the extrusion piston, the screw rod is slidingly installed on a screw rod supporting sliding plate, the screw rod supporting sliding plate is fixed on the adjusting cylinder, and an air vent is also provided on the screw rod supporting sliding plate, and the interior of the adjusting cylinder is communicated with the interior of the three-way connecting pipe.

[0008] Preferably, a first gear ring limiting ring is fixed at the circumference of the screw supporting the sliding plate, a center nut gear is threadedly sleeved on the screw, a sealing buckle cover is fixedly installed on the first gear ring limiting ring, and the first gear ring and the second gear ring are rotatably installed on the inner sides of the sealing buckle cover and the first gear ring limiting ring respectively.

[0009] Preferably, the first gear ring and the second gear ring are meshed with the center nut gear through a plurality of planetary gears for transmission, and all the planetary gears are rotatably mounted on a planetary gear support plate, which is rotatably disposed between the first gear ring and the second gear ring, and a permanent magnetic limiting block is embedded in the planetary gear support plate.

[0010] Preferably, the sealing buckle cover is slidably matched with the screw rod, an electromagnet is fixed on the sealing buckle cover, the electromagnet is slidably matched with the screw rod, and the electromagnet is magnetically matched with the permanent magnetic limiting block.

[0011] Preferably, an adjusting motor is fixedly mounted on the adjusting cylinder, and the output shaft of the adjusting motor is coupled with the first gear ring and the second gear ring through a transmission belt.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention forms a pressure difference between the detection pressure tube and the balance pressure tube, and detects the fluid flow rate and flow rate in combination with a pressure sensor, thereby effectively avoiding the influence of pipeline vibration on the flow detection accuracy. The change in vibration frequency will not interfere with the change in resistance of the pressure sensor, thereby achieving stable and reliable flow measurement; (2) The present invention automatically reduces the flow aperture when the flow rate is low by adjusting the linkage between the pressure ring and the deformable rubber ring, thereby increasing the flow rate of the fluid through the vortex generator, thereby enhancing the strength of the vortex signal and improving the detection accuracy, and is particularly suitable for measurement in a low flow rate environment; (3) The present invention adds an electromagnet to cooperate with a permanent magnetic limit block to prevent the planetary gear bracket disk from rotating inadvertently. Only when the electromagnet is energized, the adjustment device will operate normally, avoiding adjustment errors caused by misoperation, thereby protecting the equipment and measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the protective shell of the present invention.

[0015] Figure 3 It is a schematic diagram of the structure of the deformable rubber ring of the present invention.

[0016] Figure 4 It is a structural schematic diagram of the regulating cylinder of the present invention.

[0017] Figure 5 This is a schematic diagram of the structure of the pressure pipe detection device of the present invention.

[0018] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point A in the middle.

[0019] Figure 7 It is a structural schematic diagram of the piston rod of the present invention.

[0020] Figure 8 This is a diagram showing the relative positions of the vortex generator and two detection pressure tubes of the present invention.

[0021] In the figure: 101-intermediate pipe; 102-protective shell; 103-vibration frequency monitoring component; 104-balance pressure pipe bracket; 105-balance pressure pipe; 106-detection pressure pipe; 107-blocking sealing plug; 108-embedded groove hole; 109-vortex generator; 110-connecting circular hole; 111-piston rod; 112-pressure plate; 113-pressure sensor; 114-pressure sensor limit frame; 115-adjustment tube bracket; 116-adjustment tube; 117-flange; 118-adjustment pressure ring; 1 19-pressure delivery pipe; 120-deformable rubber ring; 121-connecting sealing ring; 122-flow regulating valve; 123-three-way connecting pipe; 124-extrusion piston; 125-electromagnet; 126-sealing buckle cover; 127-screw; 128-planetary gear; 129-transmission belt; 130-first gear ring; 131-planetary gear support plate; 132-permanent magnet limiting block; 133-screw supporting sliding plate; 134-first gear ring limiting ring; 135-center nut gear; 136-second gear ring; 137-adjusting motor. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-8 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0023] The present invention provides a vibration-resistant vortex flowmeter, comprising an intermediate pipe 101, wherein a vortex generator 109 is arranged at the central position inside the intermediate pipe 101, the vortex generator 109 is arranged along the radial direction of the intermediate pipe 101, and a connecting circular hole 110 is also opened on the intermediate pipe 101, and a vibration frequency monitoring component 103 is fixedly and sealedly arranged at the connecting circular hole 110, and the vibration frequency monitoring component 103 is used to monitor and display the vibration frequency of the vortex generator 109; two parallel detection pressure tubes 106 are arranged on the side of the vortex generator 109, and the two detection pressure tubes 106 are fixedly installed on the blocking sealing plug 107, and an embedded groove hole 108 is also opened on the intermediate pipe 101, wherein the blocking sealing plug 107 is fixedly blocked in the embedded groove hole 108, and the bottom ends of the two detection pressure tubes 106 are arranged at the center of the intermediate pipe 101. Two balancing pressure tubes 105 are also inserted and embedded in the intermediate pipe 101. One end of the two balancing pressure tubes 105 is located inside the intermediate pipe 101 and is flush with the inner wall surface of the intermediate pipe 101. The balancing pressure tube 105 is the same as the inside of the intermediate pipe 101. The two balancing pressure tubes 105 are fixed on the balancing pressure tube bracket 104. The two balancing pressure tubes 105 and the two detection pressure tubes 106 are arranged one by one. The opposite ends of every two corresponding balancing pressure tubes 105 and the detection pressure tube 106 are slidingly sealed and inserted with a piston rod 111. The outer sides of the balancing pressure tube bracket 104 and the balancing pressure tube 105 are provided with a protective shell 102, and the protective shell 102 is fixed on the intermediate pipe 101. A pressure plate 112 is fixed to the middle of the two piston rods 111. The upper and lower surfaces of the two pressure plates 112 are contacted with pressure sensors 113. A pressure sensor limit frame 114 is also fixed to the middle pipe 101. The pressure sensor limit frame 114 wraps the four pressure sensors 113 to limit the displacement of the pressure plate 112 so that the pressure sensors 113 are in contact with the pressure sensor limit frame 114. A connecting sealing ring 121 is fixed to both ends of the middle pipe 101. A flange 117 is fixedly installed on the side of the connecting sealing ring 121 through an adjusting pressure ring 118. A deformable rubber ring 120 is fixedly sealed on the inner side of the adjusting pressure ring 118. A pressure delivery pipe 119 is fixedly connected to each adjusting pressure ring 118. The two pressure delivery pipes 119 are connected through a three-way connecting pipe 123. A flow regulating valve 122 is serially arranged on each pressure delivery pipe 119.

[0024] An adjusting cylinder 116 is fixedly mounted on the intermediate pipe 101 through an adjusting cylinder bracket 115, an extrusion piston 124 is slidably sealed on the inner wall of the adjusting cylinder 116, a screw 127 is fixed on the eccentric position of the side of the extrusion piston 124, the screw 127 is slidably mounted on a screw support sliding plate 133, the screw support sliding plate 133 is fixed on the adjusting cylinder 116, and a vent hole is also provided on the screw support sliding plate 133, the interior of the adjusting cylinder 116 is connected to the interior of the three-way connecting pipe 123. A first toothed ring limiting ring 134 is fixed on the circumference of the screw support sliding plate 133, a central nut gear 135 is threadedly sleeved on the screw 127, a sealing buckle cover 126 is fixedly mounted on the first toothed ring limiting ring 134, and a first toothed ring 130 and a second toothed ring 136 are rotatably mounted on the inner sides of the sealing buckle cover 126 and the first toothed ring limiting ring 134, respectively. The first gear ring 130 and the second gear ring 136 are meshed with the central nut gear 135 through a plurality of planetary gears 128, and all the planetary gears 128 are rotatably mounted on the planetary gear support plate 131, which is rotatably arranged between the first gear ring 130 and the second gear ring 136, and a permanent magnetic limit block 132 is embedded in the planetary gear support plate 131. The sealing buckle cover 126 is slidably matched with the screw rod 127, and an electromagnet 125 is fixed on the sealing buckle cover 126, and the electromagnet 125 is slidably matched with the screw rod 127, and the electromagnet 125 is magnetically matched with the permanent magnetic limit block 132. An adjusting motor 137 is fixedly mounted on the adjusting cylinder 116, and the output shaft of the adjusting motor 137 is transmitted and matched with the first gear ring 130 and the second gear ring 136 through a transmission belt 129.

[0025] The working principle of a vibration-resistant vortex flowmeter disclosed in the present invention is as follows: two flanges 117 of the device are installed in series in the pipeline where the flow needs to be measured. When a fluid passes through the middle pipe 101, the fluid will flow through the vortex generator 109, and then vortices will be formed alternately on both sides of the vortex generator 109. The frequency of the two adjacent vortices is proportional to the flow rate. When the vortex is generated, the vortex generator 109 itself will vibrate. Therefore, the vibration frequency of the vortex generator 109 is monitored by the vibration frequency monitoring component 103, thereby monitoring the flow rate and flow rate of the fluid. When the pipeline where the flow needs to be detected is in vibration, the frequency of the vibration will have a certain impact on the vortex generator 109, thereby affecting the detection accuracy of the flow. At this time, the frequency of the resistance change of the corresponding pressure sensor 113 on the two pressure plates 112 can be measured. This is because when the fluid passes through the vortex generator 109, vortices are alternately generated behind the vortex generator 109. The flow velocity at the vortex is different from the flow velocity of the fluid at other positions, so the pressure at the vortex will change. The detection pressure tube 106 and the balance pressure tube 105 are both connected to the inside of the intermediate pipe 101, and the inner diameters of the detection pressure tube 106 and the balance pressure tube 105 are the same. Therefore, the pressure inside the detection pressure tube 106 and the balance pressure tube 105 is in a balanced state. When the vortex passes through the detection pressure tube 106 (vortex generator 10 9 is smaller than the inner diameter of the middle pipe 101, in order to prevent eddy currents from being generated at some positions and to prevent eddy currents from affecting the balance pressure pipe 105), which will change the pressure inside the detection pressure pipe 106, thereby causing an imbalance in the pressure inside the balance pressure pipe 105 and the detection pressure pipe 106. At this time, the piston rod 111 will be subjected to a force along its own axis, and the pressure plate 112 fixed on the piston rod 111 will transfer the force to the pressure sensor 113, thereby applying pressure to the pressure sensor 113, and the resistance value of the pressure sensor 113 will change. Since this method detects the flow rate through changes in pressure, the accuracy of the measurement will not be affected by vibration.

[0026] When the fluid flow rate decreases, the regulating motor 137 can also be started. The output shaft of the regulating motor 137 drives the first gear ring 130 and the second gear ring 136 to rotate through the transmission belt 129. The first gear ring 130 and the second gear ring 136 drive the center nut gear 135 to rotate through the planetary gear 128. The center nut gear 135 drives the screw rod 127 to move along its own axial direction, thereby pushing the extrusion piston 124 to slide in the regulating cylinder 116, changing the pressure inside the regulating cylinder 116, and transmitting the pressure to the two pressure delivery pipes 119 through the three-way connecting pipe 123, and then changing the pressure inside the regulating pressure ring 118. When the pressure inside the regulating pressure ring 118 increases, the deformed rubber ring 120 will be lifted up (similar to the action of blowing a balloon). At this time, the inner diameter of the deformed rubber ring 120 will be reduced, thereby reducing the aperture inside the flange 117, thereby increasing the flow rate, so that the fluid can obtain a higher flow rate when entering the middle pipe 101, thereby improving the detection accuracy of the vortex generator 109 at low flow. A pressure sensor is provided inside the regulating pressure ring 118 to detect the pressure change inside the regulating pressure ring 118, and then detect the deformation of the deformed rubber ring 120, and the pressure inside the corresponding regulating pressure ring 118 is adjusted separately through the provided flow regulating valve 122. Before this, the electromagnet 125 needs to be started, and the electromagnet 125 generates magnetic force to magnetically constrain the permanent magnetic limit block 132, thereby limiting the rotation of the planetary gear support plate 131. If the planetary gear support plate 131 cannot rotate, the planetary gear 128 cannot revolve. At this time, the power can be smoothly transmitted from the regulating motor 137 to the center nut gear 135. If the electromagnet 125 is not powered on, even if the regulating motor 137 is started, the pressure inside the regulating cylinder 116 will not change, because the center nut gear 135 cannot rotate. It plays a role in preventing accidental touch.

Claims

1. A vibration-resistant vortex flowmeter, characterized in that: The invention comprises an intermediate pipe (101), wherein a vortex generator (109) is arranged at a central position inside the intermediate pipe (101), the vortex generator (109) is arranged along the radial direction of the intermediate pipe (101), and a connecting circular hole (110) is also opened on the intermediate pipe (101), and a vibration frequency monitoring component (103) is fixedly and sealedly arranged at the connecting circular hole (110), and the vibration frequency monitoring component (103) is used to monitor and display the vibration frequency of the vortex generator (109); Two parallel detection pressure tubes (106) are arranged on the side of the vortex generating body (109), and the two detection pressure tubes (106) are fixedly mounted on the plugging sealing plug (107). An embedding groove hole (108) is also provided on the middle pipe (101), wherein the plugging sealing plug (107) is fixedly plugged in the embedding groove hole (108), and the bottom ends of the two detection pressure tubes (106) are arranged at the center of the middle pipe (101).

2. The vibration-resistant vortex flowmeter according to claim 1, characterized in that: Two balancing pressure tubes (105) are also inserted and embedded in the middle pipe (101). One end of the two balancing pressure tubes (105) is located inside the middle pipe (101) and is arranged flush with the inner wall surface of the middle pipe (101). The balancing pressure tubes (105) are the same as the inside of the middle pipe (101). The two balancing pressure tubes (105) are fixed on the balancing pressure tube bracket (104). The two balancing pressure tubes (105) and the two detection pressure tubes (106) are arranged in a one-to-one correspondence. The opposite ends of each two corresponding balancing pressure tubes (105) and the detection pressure tubes (106) are slidably sealed and inserted with piston rods (111). The outer sides of the balancing pressure tube bracket (104) and the balancing pressure tube (105) are provided with a protective shell (102), and the protective shell (102) is fixed on the middle pipe (101).

3. The vibration-resistant vortex flowmeter according to claim 2, characterized in that: A pressure plate (112) is fixed in the middle of the two piston rods (111), and the upper and lower surfaces of the two pressure plates (112) are both provided with pressure sensors (113) in contact with each other. A pressure sensor limit frame (114) is also fixed on the middle pipe (101), and the pressure sensor limit frame (114) wraps around the four pressure sensors (113) to limit the displacement of the pressure plates (112) so that the pressure sensors (113) are in contact with and matched with the pressure sensor limit frame (114).

4. The vibration-resistant vortex flowmeter according to claim 3, characterized in that: Both ends of the intermediate pipe (101) are fixed with connecting sealing rings (121), and a flange (117) is fixedly installed on the side of the connecting sealing ring (121) via an adjusting pressure ring (118). A deformable rubber ring (120) is fixedly sealed on the inner side of the adjusting pressure ring (118), and each adjusting pressure ring (118) is fixedly connected to a pressure delivery pipe (119), and the two pressure delivery pipes (119) are connected via a three-way connecting pipe (123), and each pressure delivery pipe (119) is serially connected with a flow regulating valve (122).

5. The vibration-resistant vortex flowmeter according to claim 4, characterized in that: An adjusting cylinder (116) is fixedly mounted on the intermediate pipe (101) via an adjusting cylinder bracket (115); an extrusion piston (124) is slidably and sealably arranged on the inner wall of the adjusting cylinder (116); a screw rod (127) is fixedly mounted at an eccentric position on the side of the extrusion piston (124); the screw rod (127) is slidably mounted on a screw rod support sliding plate (133); the screw rod support sliding plate (133) is fixed on the adjusting cylinder (116); and a vent hole is also provided on the screw rod support sliding plate (133); the interior of the adjusting cylinder (116) is communicated with the interior of the three-way connecting pipe (123).

6. The vibration-resistant vortex flowmeter according to claim 5, characterized in that: A first toothed ring limiting ring (134) is fixed at the circumference of the screw rod supporting the sliding plate (133); a central nut gear (135) is threadedly sleeved on the screw rod (127); a sealing buckle cover (126) is fixedly mounted on the first toothed ring limiting ring (134); and a first toothed ring (130) and a second toothed ring (136) are rotatably mounted on the inner sides of the sealing buckle cover (126) and the first toothed ring limiting ring (134), respectively.

7. The vibration-resistant vortex flowmeter according to claim 6, characterized in that: The first gear ring (130) and the second gear ring (136) are meshed with the central nut gear (135) through a plurality of planetary gears (128), and all the planetary gears (128) are rotatably mounted on a planetary gear support disk (131). The planetary gear support disk (131) is rotatably arranged between the first gear ring (130) and the second gear ring (136), and a permanent magnetic limiting block (132) is embedded in the planetary gear support disk (131).

8. The vibration-resistant vortex flowmeter according to claim 7, characterized in that: The sealing buckle cover (126) is slidably matched with the screw rod (127), an electromagnet (125) is fixed on the sealing buckle cover (126), the electromagnet (125) is slidably matched with the screw rod (127), and the electromagnet (125) is magnetically matched with the permanent magnetic limiting block (132).

9. The vibration-resistant vortex flowmeter according to claim 8, characterized in that: An adjusting motor (137) is fixedly mounted on the adjusting cylinder (116), and an output shaft of the adjusting motor (137) is in transmission cooperation with the first gear ring (130) and the second gear ring (136) via a transmission belt (129).

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