Magnetoelectric vortex shedding flowmeter

Abstract

The utility model relates to a magnetoelectric vortex shedding flowmeter which comprises a measuring tube and a vortex shedding generating body arranged in the measuring tube, an inserting rod is arranged on the measuring tube, a signal electrode is arranged at the end, located on the inner side of the measuring tube, of the inserting rod, upper magnetic steel is arranged above the signal electrode, lower magnetic steel is arranged below the signal electrode, the upper magnetic steel is sleeved on the inserting rod, and the lower magnetic steel is sleeved on the inserting rod. A sealing sleeve is arranged on the measuring tube on the outer side of the upper magnetic steel, a packing gasket, sealing packing and a packing pressing sleeve are arranged in the sealing sleeve, a packing pressing plate is arranged above the packing pressing sleeve, a fixed wing plate is arranged on the outer side of the sealing sleeve, and a plurality of packing pressing devices are arranged on the fixed wing plate and the packing pressing plate; each filler pressing device comprises a first connecting lead screw, a first nut, a second nut and a spring. And the service life of the sealing filler between the insertion rod and the measuring tube is prolonged. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of flow metering equipment, in particular to a magnetoelectric vortex flowmeter. Background Art

[0002] The magnetoelectric vortex flowmeter is manufactured by combining electromagnetic induction with the Karman vortex principle. When the conductive fluid flows through the vortex generator, a regularly staggered vortex is formed. A magnetic steel assembly is provided on the outer wall downstream of the vortex generator. The center of the magnetic field formed by the magnetic steel assembly is equipped with a signal acquisition electrode. The magnetic flux is constant, and two rows of vortices appear alternately, cutting the magnetic field in different directions, generating an alternating electromotive force between the electrodes. The frequency of the alternating electromotive force is the separation frequency of the vortex. Therefore, as long as the frequency of the alternating electromotive force output by the electrode is measured, the volume flow rate of the fluid can be calculated. This detection method requires that the fluid has a certain conductivity. The detection of the vortex frequency consists of two parts: the signal electrode and the permanent magnet. The signal electrode is made of 316L stainless steel. The permanent magnet is neodymium iron boron. The size of the induced electromotive force is related to the magnetic induction intensity of the permanent magnet, the diameter of the signal electrode, and the speed of cutting the magnetic lines of force. The main purpose is to obtain a larger frequency signal by increasing the magnetic induction intensity of the permanent magnet.

[0003] After the upstream medium passes through the vortex generator, Karman vortex streets will be alternately generated on both sides of the vortex generator. The medium tail flow that generates the Karman vortex street, due to the action of the magnetic steel, two rows of vortices appear alternately and continuously, and cut the magnetic field in different directions, so that the signal acquisition electrode can collect the alternating electromotive force for conversion into flow parameters. According to the signal detection principle of the vortex flowmeter, when the vortex flowmeter is applied to the transportation field of conductive liquid media, since the specific gravity of the liquid medium is greater than that of the gas medium, after the liquid medium passes through the vortex generator, the vortex generator alternately generates Karman vortex streets on both sides, and the corresponding vortex flowmeter body will also vibrate, and the amplitude of the vibration is related to the speed of the liquid medium transportation. For the plug-in split vortex flowmeter, the liquid medium containing the Karman vortex street continuously impacts the plug rod, and the plug rod and the measuring tube will also vibrate. The plug rod and the measuring tube need to be sealed with fillers to reduce the gap between the plug rod and the measuring tube to prevent the leakage of the medium. Long-term continuous vibration will cause the sealing filler to leak. If leakage occurs due to loss of sealing packing, it is necessary to reseal the plug rod and the measuring tube to reduce leakage. Therefore, there is room for improvement in the prior art for insertable vortex flowmeters, thereby reducing the use of the sealing packing between the plug rod and the measuring tube under the condition that the measuring tube and the plug rod continuously vibrate, thereby reducing the frequency of leakage between the measuring tube and the plug rod, and thus reducing the number of maintenance times. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a magnetoelectric vortex flowmeter capable of increasing the service life of a sealing filler between an insertion rod and a measuring tube, so as to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is: a magnetoelectric vortex flowmeter, comprising a measuring tube and a vortex generator arranged in the measuring tube, a plug rod is arranged on the measuring tube, a signal electrode is arranged on one end of the plug rod located on the inner side of the measuring tube, an upper magnetic steel is arranged above the signal electrode, and a lower magnetic steel is arranged below the signal electrode, the upper magnetic steel is sleeved on the plug rod, a sealing sleeve is arranged on the measuring tube outside the upper magnetic steel, a packing gasket, a sealing packing and a packing pressing sleeve are arranged in sequence in the sealing sleeve above the upper magnetic steel along the direction from close to the upper magnetic steel to away from the upper magnetic steel, a packing pressing plate is arranged on the plug rod above the packing pressing sleeve, a fixed wing plate is arranged on the outer side of the sealing sleeve, and a plurality of packing pressing devices distributed in a star shape around the central axis of the plug rod are arranged on the fixed wing plate and the packing pressing plate, each of the packing pressing devices comprises a first connecting screw arranged on the fixed wing plate and the packing pressing plate, a first nut arranged on the first connecting screw below the fixed wing plate, a second nut arranged on the first connecting screw above the packing pressing plate, and a spring arranged on the first connecting screw between the second nut and the packing pressing plate.

[0006] Preferably, the diameter of the circumscribed circle at the top of the packing sleeve gradually decreases as the height of the packing sleeve decreases, and a partial shape of the packing pressure plate matches the shape of the top of the packing sleeve.

[0007] Preferably, a first rectifier tube is arranged on the end of the measuring tube close to the vortex generator, a second rectifier tube is arranged on the end of the measuring tube away from the vortex generator, and a tapered tube is arranged on the end of the first rectifier tube away from the measuring tube, and the inner diameter of the partial tapered tube gradually decreases as it approaches the first rectifier tube.

[0008] Preferably, flange connection devices are respectively arranged between the first rectifier tube and the measuring tube, between the measuring tube and the second rectifier tube, and between the first rectifier tube and the tapered tube, and the flange connection devices include a first flange, a second flange arranged on one side of the first flange, a plurality of first fixing bolts arranged on the first flange and the second flange, and a sealing gasket arranged between the first flange and the second flange.

[0009] Preferably, the shape of the inner cavity of the first rectifier tube, the shape of the inner cavity of the second rectifier tube and the shape of the inner cavity of the measuring tube all adopt a cylindrical structure, the inner diameter of the first rectifier tube and the inner diameter of the second rectifier tube both correspond to the inner diameter of the measuring tube, the length of the inner cavity of the first rectifier tube is not less than 10 times the diameter of the inner cavity of the first rectifier tube, and the length of the inner cavity of the second rectifier tube is not less than 5 times the diameter of the inner cavity of the second rectifier tube.

[0010] Preferably, a movable wing plate is provided on the insertion rod above the fixed wing plate, and second connecting screws are provided on the movable wing plate and the fixed wing plate. The number of the second connecting screws is several, and the several second connecting screws are evenly distributed in a star shape on the outside of the central axis of the insertion rod. Third nuts are respectively provided on the several second connecting screws on both sides of the movable wing plate and the several second connecting screws on both sides of the fixed wing plate. A limiting ring is provided above the movable wing plate, and a plurality of second fixing bolts distributed in a star shape around the central axis of the insertion rod are provided on the limiting ring, and each second fixing bolt is against the insertion rod.

[0011] Preferably, a heat sink is provided on the insertion rod above the fixed wing plate.

[0012] The beneficial effects of the utility model are as follows: firstly, the utility model installs a sealing sleeve by installing a measuring tube, installs a packing gasket, a sealing packing and a packing pressing sleeve on the sealing sleeve, installs a packing pressing plate above the packing pressing sleeve, and combines the fixed wing plate installed on the outer side of the sealing sleeve and several packing clamping devices installed on the packing pressing plate and the fixed wing plate, so that the packing pressing sleeve continuously squeezes the sealing packing, and then after the inner cavity of the sealing packing is expanded due to the vibration of the plug rod, the continuous pressure applied by the packing pressing sleeve to the sealing packing causes the sealing packing to deform again, thereby reducing the gap between the sealing packing and the plug rod, thereby reducing the leakage of the fluid medium from the plug rod and the measuring tube.

[0013] Secondly, a heat sink is arranged on the plug rod above the fixed wing plate described in the utility model; the number of the heat sinks is several, the plug rod transfers heat to the heat sink, the air and the heat sink perform heat exchange, and installing several heat sinks is convenient to increase the heat dissipation area, thereby improving the heat dissipation effect.

[0014] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A. DETAILED DESCRIPTION

[0017] like Figure 1 and Figure 2As shown, a magnetoelectric vortex flowmeter comprises a measuring tube 1 and a vortex generator 2 arranged in the measuring tube 1, a plug rod 3 is arranged on the measuring tube 1, a signal electrode 4 is arranged on one end of the plug rod 3 located inside the measuring tube 1, an upper magnetic steel 5 is arranged above the signal electrode 4, and a lower magnetic steel 6 is arranged below the signal electrode 4, the upper magnetic steel 5 is sleeved on the plug rod 3, a sealing sleeve 7 is arranged on the measuring tube 1 outside the upper magnetic steel 5, a packing gasket 8, a sealing packing 9 and a packing sleeve 10 are arranged in sequence in the sealing sleeve 7 above the upper magnetic steel 5 along the direction from close to the upper magnetic steel 5 to away from the upper magnetic steel 5, and a packing gasket 8, a sealing packing 9 and a packing sleeve 10 are arranged above the packing sleeve 10. A packing pressure plate 11 is provided on the insertion rod 3, and a fixed wing plate 12 is provided on the outer side of the sealing sleeve 7. A plurality of packing clamping devices distributed in a star shape around the central axis of the insertion rod 3 are provided on the fixed wing plate 12 and the packing pressure plate 11. Each of the packing clamping devices includes a first connecting screw 13 provided on the fixed wing plate 12 and the packing pressure plate 11, a first nut 14 provided on the first connecting screw 13 below the fixed wing plate 12, a second nut 15 provided on the first connecting screw 13 above the packing pressure plate 11, and a spring 16 provided on the first connecting screw 13 between the second nut 15 and the packing pressure plate 11.

[0018] The diameter of the circumscribed circle at the top of the packing gland 10 gradually decreases as the height of the packing gland 10 decreases. Preferably, the top of the packing gland 10 adopts a truncated cone tubular structure; the shape of part of the packing plate 11 matches the shape of the top of the packing gland 10. Thus, the matching relationship between the packing plate 11 and the packing gland 10 structure is utilized to facilitate the packing plate 11 to exert a downward force on the packing gland 10 when the packing plate 11 is subjected to a downward force, thereby causing the sealing packing 9 to deform under the extrusion of the packing gasket 8 and the packing gland 10, thereby reducing the gap between the plug rod 3 and the sealing sleeve 7.

[0019] When the minimum velocity of the liquid medium passing through the measuring tube 1 is too low, the liquid medium with too low flow rate impacts the vortex generator 2 to generate a wake, and since the flow rate of the fluid medium passing through the vortex generator 2 is too low, the downstream signal electrode 4 is not easy to sense the Karman vortex street contained in the wake, resulting in unreliable data feedback. For the working condition where the valley value of the liquid medium delivery velocity is too low and accurate feedback is required, the product is provided with a first rectifier tube 17 on the end of the measuring tube 1 close to the vortex generator 2, a second rectifier tube 18 on the end of the measuring tube 1 away from the vortex generator 2, and a reducer 19 on the end of the first rectifier tube 17 away from the measuring tube 1, and the inner diameter of the part of the reducer 19 gradually decreases as it approaches the first rectifier tube 17. The upstream medium gradually increases its flow velocity through the reducer 19 and is then delivered to the first rectifier tube 17 for rectification, and then delivered to the measuring tube 1. The medium passes through the vortex generator 2 to form a wake including a Karman vortex street. The wake is collected by the signal electrode 4 under the action of the upper magnetic steel 5 and the lower magnetic steel 6. The wake enters the second rectifier tube 18 through the measuring tube 1 for further rectification and then delivered to the downstream user. Further, flange connection devices are respectively provided between the first rectifier tube 17 and the measuring tube 1, between the measuring tube 1 and the second rectifier tube 18, and between the first rectifier tube 17 and the reducer 19. The flange connection devices include a first flange 20, a second flange 21 provided on one side of the first flange 20, a plurality of first fixing bolts 22 provided on the first flange 20 and the second flange 21, and a sealing gasket 23 provided between the first flange 20 and the second flange 21. A third flange 30 is respectively provided on the end of the second rectifier tube 18 away from the measuring tube 1 and the end of the reducer 19 away from the first rectifier tube 17.

[0020] Turbulence will be generated after the liquid fluid passes through the tapered tube 19 and when the liquid fluid passes through the measuring tube 1. In order to improve the rectifying effect of the first rectifier tube 17 and the second rectifier tube 18, the shape of the inner cavity of the first rectifier tube 17, the shape of the inner cavity of the second rectifier tube 18 and the shape of the inner cavity of the measuring tube 1 described in this product all adopt a cylindrical structure. The inner diameter of the first rectifier tube 17 and the inner diameter of the second rectifier tube 18 are both corresponding to the inner diameter of the measuring tube 1. The length of the inner cavity of the first rectifier tube 17 is not less than 10 times the diameter of the inner cavity of the first rectifier tube 17, and the length of the inner cavity of the second rectifier tube 18 is not less than 5 times the diameter of the inner cavity of the second rectifier tube 18.

[0021] A movable wing plate 24 is provided on the plunger 3 above the fixed wing plate 12, and a second connecting screw 25 is provided on the movable wing plate 24 and the fixed wing plate 12. The number of the second connecting screws 25 is several, and the several second connecting screws 25 are evenly distributed in a star shape outside the central axis of the plunger 3. Third nuts 26 are respectively provided on the several second connecting screws 25 on both sides of the movable wing plate 24 and the several second connecting screws 25 on both sides of the fixed wing plate 12, so as to facilitate the adjustment of the position of the movable wing plate 24 and the installation position of the movable wing plate 24; a limit ring 27 is provided above the movable wing plate 24, and a plurality of second fixing bolts 28 are distributed in a star shape around the central axis of the plunger 3 on the limit ring 27, and each second fixing bolt 28 is against the plunger 3. Installing a plurality of second fixing bolts 28 facilitates the fixing of the plunger 3.

[0022] A heat sink 29 is provided on the plug rod 3 above the fixed wing plate 12. The number of the heat sink 29 is several, and the plug rod 3 transfers heat to the heat sink 29, and the air and the heat sink 29 perform heat exchange. Installing several heat sinks 29 is convenient for increasing the heat dissipation area, so that the heat dissipation effect is improved.

[0023] The usage of this product is as follows: Figure 1 and Figure 2 As shown in the figure, install this product to the preset installation position. When this product receives the medium transported from the upstream, the specific feedback flow process includes the following steps:

[0024] First, the flow velocity of the liquid medium increases after the upstream medium passes through the reducer 19; then, it is delivered to the first rectifier tube 17 for rectification to form a liquid medium with a stable flow velocity; then, the liquid medium with a stable flow velocity is delivered to the measuring tube 1 and passes through the vortex generator 2, and Karman vortex streets are alternately generated on both sides of the vortex generator 2, and the signal parameters of the Karman vortex street are fed back by the signal electrode 4 in the magnetic field formed by the upper magnetic steel 5 and the lower magnetic steel 6; then, the fluid medium is delivered to the second rectifier tube 18 for rectification again after passing through the wake formed by the signal electrode 4 on the plug rod 3, and then delivered to the downstream user.

[0025] In the above process, the signal electrode 4 continuously feeds back the Karman vortex street generated by the vortex generator 2. Since the signal electrode 4 is installed on the plug rod 3, the plug rod 3 will also vibrate due to continuous contact with the Karman vortex street, thereby causing the inner cavity of the sealing packing 9 to become larger, thereby causing the medium to leak from the sealing packing 9 and the plug rod 3. This product utilizes the adjustment of the positions of the first nut 14 and the second nut 15 in several of the packing clamping devices on the first connecting screw 13, thereby adjusting the compression degree of the spring 16 in several of the packing clamping devices, so that the packing pressure plate 11 can obtain pressure toward the sealing packing 9 under the action of the spring 16 in several of the packing clamping devices, so that the packing sleeve 10 maintains continuous squeezing of the sealing packing 9, even if the inner cavity of the sealing packing 9 is too large due to the vibration of the plug rod 3, and the gap between the sealing packing 9 and the plug rod 3 is increased, the sealing packing 9 can be deformed again under the continuous squeezing of the packing sleeve 10, so that the plug rod 3 and the sealing packing 9 are reduced, thereby achieving the purpose of re-sealing. When the usage cycle reaches the preset cycle, it is necessary to adjust the positions of the first nut 14 and the second nut 15 in the packing clamping device on the first connecting screw 13 again, and readjust the compression degree of the spring 16 in the packing clamping device to keep the product working normally.

[0026] Through this embodiment, the sealing sleeve 7 is installed by installing the measuring tube 1, the packing gasket 8, the sealing packing 9 and the packing sleeve 10 are installed on the sealing sleeve 7, and the packing pressing plate 11 is installed above the packing sleeve 10, combined with the fixed wing plate 12 installed on the outer side of the sealing sleeve 7 and the packing pressing devices installed on the packing pressing plate 11 and the fixed wing plate 12, so that the packing sleeve 10 continuously squeezes the sealing packing 9, and then the inner cavity of the sealing packing 9 is expanded due to the vibration of the plug rod 3. The continuous pressure applied by the packing sleeve 10 to the sealing packing 9 causes the sealing packing 9 to deform again, thereby reducing the gap between the sealing packing 9 and the plug rod 3, thereby reducing the leakage of the fluid medium from the plug rod 3 and the measuring tube 1.

[0027] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A magnetoelectric vortex flowmeter, comprising a measuring tube (1) and a vortex generator (2) arranged in the measuring tube (1), a plug rod (3) being arranged on the measuring tube (1), a signal electrode (4) being arranged on one end of the plug rod (3) located inside the measuring tube (1), an upper magnetic steel (5) being arranged above the signal electrode (4), and a lower magnetic steel (6) being arranged below the signal electrode (4), characterized in that: The upper magnetic steel (5) is sleeved on the insertion rod (3), and a sealing sleeve (7) is arranged on the measuring tube (1) outside the upper magnetic steel (5). A packing gasket (8), a sealing packing (9) and a packing pressing sleeve (10) are arranged in sequence in the sealing sleeve (7) above the upper magnetic steel (5) along the direction from close to the upper magnetic steel (5) to away from the upper magnetic steel (5). A packing pressing plate (11) is arranged on the insertion rod (3) above the packing pressing sleeve (10), and a fixed wing plate (12) is arranged on the outer side of the sealing sleeve (7). The fixed wing plate (12) and the packing pressing plate (11) are provided with A plurality of packing pressing devices are arranged in a star shape around the central axis of the insert rod (3), each of the packing pressing devices comprising a first connecting screw (13) arranged on the fixed wing plate (12) and the packing pressing plate (11), a first nut (14) arranged on the first connecting screw (13) below the fixed wing plate (12), a second nut (15) arranged on the first connecting screw (13) above the packing pressing plate (11), and a spring (16) arranged on the first connecting screw (13) between the second nut (15) and the packing pressing plate (11).

2. The magnetoelectric vortex flowmeter according to claim 1, characterized in that: The diameter of the circumscribed circle at the top of the packing pressing sleeve (10) gradually decreases as the height of the packing pressing sleeve (10) decreases, and a part of the shape of the packing pressing plate (11) matches the shape of the top of the packing pressing sleeve (10).

3. The magnetoelectric vortex flowmeter according to claim 1, characterized in that: A first rectifier tube (17) is arranged at one end of the measuring tube (1) close to the vortex generator (2), a second rectifier tube (18) is arranged at one end of the measuring tube (1) away from the vortex generator (2), and a reducer tube (19) is arranged at one end of the first rectifier tube (17) away from the measuring tube (1), wherein the inner diameter of a part of the reducer tube (19) gradually decreases as it approaches the first rectifier tube (17).

4. The magnetoelectric vortex flowmeter according to claim 3, characterized in that: Flange connection devices are respectively provided between the first rectifier tube (17) and the measuring tube (1), between the measuring tube (1) and the second rectifier tube (18), and between the first rectifier tube (17) and the reducer tube (19), wherein the flange connection devices comprise a first flange (20), a second flange (21) provided on one side of the first flange (20), a plurality of first fixing bolts (22) provided on the first flange (20) and the second flange (21), and a sealing gasket (23) provided between the first flange (20) and the second flange (21).

5. The magnetoelectric vortex flowmeter according to claim 3, characterized in that: The shapes of the inner cavities of the first rectifier tube (17), the second rectifier tube (18) and the measuring tube (1) all adopt cylindrical structures; the inner diameters of the first rectifier tube (17) and the second rectifier tube (18) correspond to the inner diameter of the measuring tube (1); the length of the inner cavity of the first rectifier tube (17) is not less than 10 times the diameter of the inner cavity of the first rectifier tube (17); and the length of the inner cavity of the second rectifier tube (18) is not less than 5 times the diameter of the inner cavity of the second rectifier tube (18).

6. The magnetoelectric vortex flowmeter according to claim 1, characterized in that: A movable wing plate (24) is provided on the insertion rod (3) above the fixed wing plate (12), and a second connecting screw (25) is provided on the movable wing plate (24) and the fixed wing plate (12). The number of the second connecting screws (25) is adopted as a plurality, and the plurality of second connecting screws (25) are evenly distributed in a star shape on the outside of the central axis of the insertion rod (3). Third nuts (26) are respectively provided on the plurality of second connecting screws (25) on both sides of the movable wing plate (24) and the plurality of second connecting screws (25) on both sides of the fixed wing plate (12). A limiting ring (27) is provided above the movable wing plate (24), and the limiting ring (27) is provided with a plurality of second fixing bolts (28) distributed in a star shape around the central axis of the insertion rod (3), and each second fixing bolt (28) is abutted against the insertion rod (3).

7. The magnetoelectric vortex flowmeter according to claim 1, characterized in that: A heat dissipation plate (29) is provided on the insertion rod (3) above the fixed wing plate (12).

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