Anti-seismic high-precision precession vortex flowmeter

Abstract

The invention discloses an anti-seismic high-precision vortex precession flowmeter, and relates to the technical field of flowmeters. The device comprises a vortex generating tube, a Venturi structure, a despinning device, a lens, a laser generator, a light sensor and a vibration reflective lens. Fluid is rotated by the swirler and forms a stable vortex through the Venturi structure, and laser light passes through the lens to detect the frequency of the vortex so as to measure the flow velocity. The vibration reflective lens is matched with the spring to monitor environment vibration, and the top light sensor receives change of reflected light to correct data. The second pressure sensor judges the flow speed emergently according to the stress of the spiral flow generator, and the reliability in a complex environment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of flow meters, and particularly to an earthquake-resistant high-precision swirling flow meter. Background Art

[0002] In the field of industrial fluid measurement, swirling flow meters are widely used because they can measure the flow rate by detecting the precession frequency of eddies. Traditional swirling flow meters usually rely on mechanical sensors to detect the rotational characteristics of fluids. Swirling flow meters are sensitive to vibrations in the installation environment. In industrial sites, the operation of mechanical equipment is often accompanied by vibrations, which can interfere with mechanical components and lead to a decrease in measurement accuracy. Secondly, existing flow meters will cause overall vibrations at high flow rates or in complex fluids, which will also interfere with mechanical components. Finally, existing flow meters have insufficient adaptability to different fluid characteristics and environmental conditions. For example, fluid rotation may affect downstream equipment. Summary of the Invention

[0003] To overcome the defects of the above-mentioned prior art, the present invention provides the following technical solution: an earthquake-resistant high-precision swirling flow meter, including a vortex generating tube, the inner wall of the vortex generating tube is provided with a Venturi structure, the Venturi structure is a retracted structure, one end of the vortex generating tube is fixedly provided with a flow straightener, two symmetrically arranged lenses are arranged between the flow straightener and the Venturi structure, two coaxially arranged flat-bottomed grooves are arranged on the lenses, and the two lenses are embedded and installed on the main body of the vortex generating tube along the tangential position of the inner wall of the vortex generating tube; a swirl generator is arranged at the end of the vortex generating tube away from the flow straightener, and the swirl generator is used to drive the fluid to rotate; a laser generator is arranged on one side of the vortex generating tube, and two light sensors are arranged on the other side of the vortex generating tube. The light emitted by the laser generator is equally divided into two beams of light by a light beam splitter. One beam of light passes through the two lenses and is received by a light sensor at the bottom, and the other beam of light is reflected by a vibration reflecting mirror whose angle can be adjusted to a light sensor at the top for monitoring the environmental vibration situation.

[0004] Preferably, the vibration reflecting mirror is fixedly installed at one end of a spring, the other end of the spring is fixedly installed on a ball head, a lever is fixedly installed on the ball head, the ball head is movably arranged on a ball head mounting seat in a ball pair mounting manner, and a screw is also threadedly installed on the ball head mounting seat, and the screw is used to fix the ball head on the ball head mounting seat.

[0005] Preferably, two light sensors are fixedly mounted on a light sensor mounting plate, and the light sensor mounting plate, the light beam splitter, the laser generator, and the ball head mounting seat are all fixedly mounted on a bottom mounting light shield. An internal protective light shield is fixedly mounted on the side surface of the bottom mounting light shield. The bottom mounting light shield and the internal protective light shield are both fixedly and sealingly sleeved on the outer surface of the eddy current generating tube, and two lenses are arranged at a position between the bottom mounting light shield and the internal protective light shield.

[0006] Preferably, the spin inducer is fixedly mounted on the inner wall of the spin generating tube. One end of the spin generating tube close to the eddy current generating tube is slidably sleeved on the eddy current generating tube. The opposite ends of the eddy current generating tube and the spin generating tube are provided with stepped grooves that can be sleeved with each other. Among them, a convex ring is fixedly sleeved on the end surface of the stepped groove on the eddy current generating tube, and a first pressure sensor is contact-fitted between the convex ring and the spin generating tube.

[0007] Preferably, one end of the spin generating tube away from the eddy current generating tube is slidably sleeved with a front-end fixed pipe, and the opposite ends of the front-end fixed pipe and the spin generating tube are provided with stepped grooves that can be sleeved with each other.

[0008] Preferably, flanges are fixedly mounted at the opposite ends of the eddy current generating tube and the front-end fixed pipe.

[0009] Preferably, the front-end fixed pipe and the eddy current generating tube are fixedly mounted through a mounting fixed sleeve, and the mounting fixed sleeve is arranged outside the spin generating tube, so that the gaps between the spin generating tube and the front-end fixed pipe and the eddy current generating tube are inside the mounting fixed sleeve.

[0010] Preferably, a second pressure sensor support arm is fixedly mounted on the outer surface of the front-end fixed pipe or the inner wall of the mounting fixed sleeve, and an auxiliary extrusion block is fixedly mounted on the outer surface of the spin generating tube. A second pressure sensor is contact-fitted between the opposite surfaces of the auxiliary extrusion block and the second pressure sensor support arm. Among them, the circumferential tangent force direction of the spin inducer is the same as the force direction of the second pressure sensor.

[0011] Preferably, an external protective light shield is sleeved outside the bottom mounting light shield and the internal protective light shield. The external protective light shield is fixedly and sealingly sleeved on the outer surface of the eddy current generating tube. A window is provided on the external protective light shield, and a window cover is magnetically sealed and fitted at the window. Among them, the position of the window cover corresponds to the position of the lever.

[0012] Preferably, a lens protective collar sleeving outside the two lenses is also fixedly mounted on the outer surface of the eddy current generating tube. The lens protective collar is used to prevent the two lenses from separating from the eddy current generating tube under the action of pressure.

[0013] The present invention has the following beneficial effects compared with the prior art: (1) The present invention realizes real-time monitoring of environmental vibrations through a vibrating reflecting lens and a spring structure. When the installation environment vibrates, the vibrating reflecting lens sways with the spring, changing the angle of the reflected light, resulting in a change in the optical signal received by the light sensor at the top; (2) The present invention uses a laser generator and a light sensor. By ensuring that the light passes vertically through the fluid through the flat-bottomed grooves on the lens, the scattering and refraction errors are reduced. The indented design of the Venturi structure enhances the stability of the vortex formation, making the precession frequency of the vortex easier to detect. The bottom light sensor accurately captures the vortex frequency through the change in the intensity of the optical signal, achieving high-precision flow velocity measurement. By detecting the precession frequency of the vortex through light, the influence of the external vibration environment on the device is greatly reduced; (3) Through the lever and ball head structure, the user can adjust the angle of the vibrating reflecting lens before installation to adapt to different environmental requirements. After adjustment, the screw fixes the position of the ball head to ensure stability. This flexible design does not require long-term calibration by professionals, reducing the installation difficulty and maintenance cost, and has significant advantages compared with the complex debugging process of the fixed structure of traditional flow meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the external protective light-shielding cover structure of the present invention.

[0016] Figure 3 It is a diagram of the installation position of the light sensor of the present invention.

[0017] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at position A.

[0018] Figure 5 It is a diagram of the installation position of the lens of the present invention.

[0019] Figure 6 It is a schematic diagram of the internal structure of the installation fixing sleeve of the present invention.

[0020] Figure 7 It is a schematic diagram of the lens structure of the present invention.

[0021] Figure 8 It is a schematic diagram of the vortex generating tube structure of the present invention.

[0022] In the figure: 101 - eddy current generating tube; 102 - external protective light shield; 103 - window shield; 104 - bottom mounting light shield; 105 - internal protective light shield; 106 - laser generator; 107 - ball head mounting seat; 108 - ball head; 109 - lever; 110 - screw; 111 - spring; 112 - vibrating reflecting lens; 113 - light sensor mounting plate; 114 - light sensor; 115 - light beam splitter; 116 - flange; 117 - lens protective collar; 118 - lens; 119 - flat bottom groove; 120 - de-rotator; 121 - front-end fixed pipe; 122 - spin-up generating tube; 123 - convex ring; 124 - first pressure sensor; 125 - mounting and fixing sleeve; 126 - second pressure sensor support arm; 127 - second pressure sensor; 128 - auxiliary extrusion block; 129 - Venturi structure; 130 - spin-up device. Detailed implementation manners

[0023] The following is combined with the attached Figures 1-8 drawings, and the technical solutions of the present invention will be further described through specific implementation manners.

[0024] The present invention provides an earthquake-resistant high-precision swirling vortex flowmeter, which includes a vortex generating tube 101. The inner wall of the vortex generating tube 101 is provided with a Venturi structure 129, and the Venturi structure 129 is an indentation structure. One end of the vortex generating tube 101 is fixedly provided with a swirl eliminator 120. Two symmetrically arranged lenses 118 are arranged between the swirl eliminator 120 and the Venturi structure 129. Two coaxially arranged flat-bottomed grooves 119 are provided on the lenses 118. The two lenses 118 are embedded and installed on the main body of the vortex generating tube 101 along the tangential position of the inner wall of the vortex generating tube 101; One end of the vortex generating tube 101 away from the swirl eliminator 120 is provided with a swirl generator 130, and the swirl generator 130 is used to drive the fluid to rotate; One side of the vortex generating tube 101 is provided with a laser generator 106, and the other side of the vortex generating tube 101 is provided with two light sensors 114. The light emitted by the laser generator 106 is equally divided into two beams of light by a light beam splitter 115. One beam of light passes through the two lenses 118 and is received by a light sensor 114 at the bottom, and the other beam of light is reflected to a light sensor 114 at the top by a vibration reflecting mirror 112 whose angle can be adjusted, for monitoring the environmental vibration condition. The vibration reflecting mirror 112 is fixedly installed at one end of a spring 111, and the other end of the spring 111 is fixedly installed on a ball head 108. A lever 109 is fixedly installed on the ball head 108. The ball head 108 is movably arranged on a ball head mounting seat 107 by means of a ball pair mounting method. A screw 110 is also threadedly installed on the ball head mounting seat 107, and the screw 110 is used to fix the ball head 108 on the ball head mounting seat 107. The two light sensors 114 are fixedly installed on a light sensor mounting plate 113. The light sensor mounting plate 113, the light beam splitter 115, the laser generator 106 and the ball head mounting seat 107 are all fixedly installed on a bottom mounting light-shielding plate 104. An internal protective light-shielding cover 105 is fixedly installed on the side of the bottom mounting light-shielding plate 104. The bottom mounting light-shielding plate 104 and the internal protective light-shielding cover 105 are both fixedly and hermetically sleeved on the outer surface of the vortex generating tube 101, and the two lenses 118 are arranged at the position between the bottom mounting light-shielding plate 104 and the internal protective light-shielding cover 105.

[0025] The swirl generator 130 is fixedly installed on the inner wall of the swirl generating pipe 122. One end of the swirl generating pipe 122 close to the eddy current generating pipe 101 is slidably sleeved on the eddy current generating pipe 101. The opposite ends of the eddy current generating pipe 101 and the swirl generating pipe 122 are provided with stepped grooves that can be sleeved with each other. Among them, a convex ring 123 is fixedly sleeved on the end face of the stepped groove on the eddy current generating pipe 101, and a first pressure sensor 124 is contact-fitted between the convex ring 123 and the swirl generating pipe 122. One end of the swirl generating pipe 122 away from the eddy current generating pipe 101 is slidably sleeved with a front-end fixed pipe 121. The opposite ends of the front-end fixed pipe 121 and the swirl generating pipe 122 are provided with stepped grooves that can be sleeved with each other. Flanges 116 are fixedly installed at the opposite ends of the eddy current generating pipe 101 and the front-end fixed pipe 121. The front-end fixed pipe 121 and the eddy current generating pipe 101 are fixedly installed through a mounting fixed sleeve 125, and the mounting fixed sleeve 125 is arranged outside the swirl generating pipe 122, so that the gaps between the swirl generating pipe 122 and the front-end fixed pipe 121 and the eddy current generating pipe 101 are inside the mounting fixed sleeve 125. A second pressure sensor support arm 126 is fixedly installed on the outer surface of the front-end fixed pipe 121 or the inner wall of the mounting fixed sleeve 125. An auxiliary extrusion block 128 is fixedly installed on the outer surface of the swirl generating pipe 122. A second pressure sensor 127 is contact-fitted between the opposite surfaces of the auxiliary extrusion block 128 and the second pressure sensor support arm 126, and the circumferential tangent force direction of the swirl generator 130 is the same as the force direction of the second pressure sensor 127. An outer protective light-shielding cover 102 is sleeved outside the bottom-mounted light-shielding plate 104 and the inner protective light-shielding cover 105. The outer protective light-shielding cover 102 is fixedly and sealingly sleeved on the outer surface of the eddy current generating pipe 101. A window is provided on the outer protective light-shielding cover 102, and a window cover 103 is magnetically sealed and fitted at the window. The position of the window cover 103 corresponds to the position of the dial rod 109. A lens protective collar 117 sleeving outside the two lenses 118 is also fixedly installed on the outer surface of the eddy current generating pipe 101. The lens protective collar 117 is used to prevent the two lenses 118 from separating from the eddy current generating pipe 101 under the action of pressure.

[0026] The working principle of an earthquake-resistant high-precision swirl flowmeter disclosed by the present invention is as follows: Two flanges 116 are installed in series in the pipeline to be measured. An indicating arrow is provided on the outer surface of the external protective light-shielding cover 102, and the direction of the arrow is the upward direction of the device. The side without the arrow mark should be the flow direction of the fluid. When the fluid (generally a liquid) passes through the swirl generator 130, it will rotate. Due to the indentation structure of the Venturi structure 129, the rotation of the fluid becomes faster and faster, thus forming a vortex. In the diffusion section of the Venturi structure 129, due to the rotation of the fluid, the vortex will shift, resulting in the phenomenon of eddy precession (the fluid itself forms a vortex, and the center of the vortex rotates around the center of the pipeline). Because the frequency of eddy precession is very fast, the actual situation is a spiral-shaped vortex. The rotation frequency of this vortex is proportional to the flow velocity of the fluid. Therefore, it is only necessary to detect the rotation frequency of the vortex. There will be bubbles in the vortex (or the density of the fluid changes). Under normal circumstances (without eddy current), the light emitted by the laser generator 106 passes through the light beam splitter 115, the lens 118, the fluid, and then passes through another lens 118 (the flat-bottomed groove 119 is provided to ensure that the light can be vertically incident on the lens 118 and then vertically exit the lens 118), and finally irradiates on a light sensor 114 at the bottom. Since the density of the fluid inside the eddy current generating tube 101 changes due to the vortex, the refractive index of the light passing through the fluid will also change, which will cause the intensity of the optical signal received by the bottom light sensor 114 to change. Therefore, by the change frequency of the intensity of the optical signal received by the bottom light sensor 114, the rotation frequency of the eddy current can be known, and thus the flow velocity of the fluid inside the eddy current generating tube 101 can be known. Since the laser generator 106 and the light sensor 114 vibrate together with the pipeline, the vibration has little influence on the detection result.

[0027] When the installation environment vibrates, the vibration reflecting lens 112 installed on the spring 111 will shake. (Due to the different angles of the installation environment, before use, it is necessary to adjust the swing angle of the ball head 108 through the lever 109, so that the ball head 108 drives the vibration reflecting lens 112 to swing through the spring 111, allowing the reflected light of the light beam splitter 115 to irradiate the light sensor 114 at the top. Finally, rotate the screw 110 to fix the ball head 108 to the ball head mounting seat 107). The shaking of the vibration reflecting lens 112 will change the included angle with the reflected light of the light beam splitter 115, thereby changing the angle of the reflected light of the vibration reflecting lens 112. At this time, the light will deflect, resulting in the vibration reflecting lens 112 being unable to reflect the light to the light sensor 114 at the top. At this time, by detecting the change in the light intensity of the top light sensor 114, it is possible to determine whether there is vibration in the environment. At this time, the resistance value of the second pressure sensor 127 is measured to emergently judge the fluid flow rate, and the flow rate measured at the bottom light sensor 114 is compared. When the fluid passes through the spin inducer 130, a circumferential rotational force will be applied to the spin inducer 130, and this force will be transmitted to the spin generation tube 122. The spin generation tube 122 will apply the force to the auxiliary extrusion block 128, and the auxiliary extrusion block 128 will extrude the second pressure sensor 127. This extrusion force is proportional to the fluid flow rate. Therefore, by detecting the resistance value of the second pressure sensor 127, the fluid flow rate can be judged (depending on the direction of vibration, the value may fluctuate, and finally only the intermediate value is taken as a reference). The spin eliminator 120 provided on the eddy current generating tube 101 is used to eliminate the rotation phenomenon of the fluid caused by the spin inducer 130 and prevent the rotating fluid from affecting the subsequent equipment).

Claims

1. A seismic-resistant high-precision vortex flowmeter, characterized in that: The invention comprises a vortex generating tube (101), wherein a Venturi structure (129) is arranged on the inner wall of the vortex generating tube (101), wherein the Venturi structure (129) is a retracted structure, wherein a derotator (120) is fixedly arranged at one end of the vortex generating tube (101), wherein two symmetrically arranged lenses (118) are arranged between the derotator (120) and the Venturi structure (129), wherein two coaxially arranged flat-bottom grooves (119) are arranged on the lenses (118), and wherein the two lenses (118) are embedded and installed on the main body of the vortex generating tube (101) along the tangent position of the inner wall of the vortex generating tube (101); A vortex generator (130) is provided at one end of the vortex generating tube (101) away from the de-vortex generator (120), and the vortex generator (130) is used to drive the fluid to rotate; A laser generator (106) is disposed on one side of the vortex generating tube (101), and two light sensors (114) are disposed on the other side of the vortex generating tube (101), wherein light emitted by the laser generator (106) is divided into two light beams in equal proportions by a light beam splitter (115), wherein one light beam passes through two lenses (118) and is received by a light sensor (114) at the bottom, and the other light beam is reflected by a vibration reflective lens (112) capable of adjusting an angle to a light sensor (114) at the top, for monitoring environmental vibration conditions.

2. A seismic-resistant high-precision vortex flowmeter according to claim 1, characterized in that: The vibrating reflective lens (112) is fixedly mounted on one end of the spring (111), and the other end of the spring (111) is fixedly mounted on the ball head (108). A lever (109) is fixedly mounted on the ball head (108). The ball head (108) is movably mounted on the ball head mounting seat (107) in a ball pair mounting manner. A screw (110) is also threadedly mounted on the ball head mounting seat (107). The screw (110) is used to fix the ball head (108) on the ball head mounting seat (107).

3. The seismic-resistant high-precision vortex flowmeter according to claim 2, characterized in that: Two light sensors (114) are fixedly mounted on a light sensor mounting plate (113); the light sensor mounting plate (113), a light beam splitter (115), a laser generator (106) and a ball head mounting seat (107) are all fixedly mounted on a bottom mounted light shielding plate (104); an internal protective light shielding cover (105) is fixedly mounted on the side of the bottom mounted light shielding plate (104); both the bottom mounted light shielding plate (104) and the internal protective light shielding cover (105) are fixedly sealed on the outer surface of the vortex generating tube (101); and two lenses (118) are arranged between the bottom mounted light shielding plate (104) and the internal protective light shielding cover (105).

4. The seismic-resistant high-precision vortex flowmeter according to claim 3, characterized in that: The vortex generator (130) is fixedly mounted on the inner wall of the vortex generating tube (122); one end of the vortex generating tube (122) close to the vortex generating tube (101) is slidably sleeved on the vortex generating tube (101); the opposite ends of the vortex generating tube (101) and the vortex generating tube (122) are provided with step grooves that can be sleeved on each other; a convex ring (123) is fixedly sleeved on the end surface of the step groove on the vortex generating tube (101); and a first pressure sensor (124) is provided in contact between the convex ring (123) and the vortex generating tube (122).

5. The seismic-resistant high-precision vortex flowmeter according to claim 4, characterized in that: One end of the vortex generating tube (122) away from the vortex generating tube (101) is slidably sleeved with a front end fixed tube (121), and the opposite ends of the front end fixed tube (121) and the vortex generating tube (122) are provided with step grooves that can be sleeved with each other.

6. The seismic-resistant high-precision vortex flowmeter according to claim 5, characterized in that: Flanges (116) are fixedly mounted on opposite ends of the vortex generating tube (101) and the front fixed pipe (121).

7. The seismic-resistant high-precision vortex flowmeter according to claim 6, characterized in that: The front fixed pipe (121) and the vortex generating pipe (101) are fixedly mounted via a mounting fixing sleeve (125), and the mounting fixing sleeve (125) is arranged outside the vortex generating pipe (122), so that the gap between the vortex generating pipe (122) and the front fixed pipe (121) and the vortex generating pipe (101) is located inside the mounting fixing sleeve (125).

8. The seismic-resistant high-precision vortex flowmeter according to claim 7, characterized in that: A second pressure sensor support arm (126) is fixedly mounted on the outer surface of the front fixed pipe (121) or the inner wall of the fixed sleeve (125), an auxiliary extrusion block (128) is fixedly mounted on the outer surface of the swirl generating tube (122), and a second pressure sensor (127) is provided in contact between the opposing surfaces of the auxiliary extrusion block (128) and the second pressure sensor support arm (126), wherein the circumferential tangent force direction of the swirl generator (130) is the same as the force direction of the second pressure sensor (127).

9. The seismic-resistant high-precision vortex flowmeter according to claim 8, characterized in that: An outer sleeve of a sunshade plate (104) and an inner protective sunshade (105) is provided at the bottom, and an outer sleeve of the outer protective sunshade (102) is fixedly sealed on the outer surface of the vortex generating tube (101). A window is provided on the outer protective sunshade (102), and a window cover (103) is provided at the window in a magnetically sealed manner, wherein the position of the window cover (103) corresponds to the position of the lever (109).

10. The anti-vibration high-precision vortex flowmeter according to claim 9, characterized in that: A lens protection ring (117) sleeved on the outside of the two lenses (118) is also fixedly mounted on the outer surface of the vortex generating tube (101), and the lens protection ring (117) is used to prevent the two lenses (118) from being separated from the vortex generating tube (101) under the action of pressure.

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