Vortex shedding flowmeter

Abstract

The utility model relates to a vortex shedding flowmeter which comprises a measuring tube, a vortex generating body and a flow sensor are arranged in the measuring tube, a supporting cylinder is arranged on the flow sensor and the measuring tube, a meter head is arranged on the supporting cylinder, and a connecting device is arranged on the measuring tube. The connecting device comprises a first flange, a second flange, a first fastening screw and a first fastening nut; a buffer device is arranged on the connecting device and comprises a first clamping groove, a second clamping groove, a connecting clamping block, a rubber layer and a connecting hole. The influence of vibration of an adjacent pipeline on the vortex shedding flowmeter can be reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to vortex flowmeter field, concretely relates to a vortex flowmeter. BACKGROUND

[0002] Vortex flowmeter is according to the research and production of karman vortex principle, mainly used for the flow measurement of industrial pipeline medium fluid, such as gas, liquid, vapor and a variety of medium. Its characteristics are small pressure loss, large range, high precision, when measuring the volume flow, almost not affected by fluid density, pressure, temperature, viscosity and other parameters. No movable mechanical parts, therefore high reliability, small maintenance amount. Instrument parameters can be long-term stable. Vortex flowmeter adopts piezoelectric stress sensor, high reliability, can work in the working temperature range of-20 ℃~+250 ℃. The principle of vortex flowmeter is based on the karman vortex theory table body with triangular column vortex generator, when fluid passes through vortex generator, two rows of regular karman vortex are generated behind vortex generator, and fluid partial kinetic energy is converted into vibration frequency signal.

[0003] Vortex flow signal is composed of two parts: one is the sine vortex signal generated by flow velocity, and the other is the noise signal caused by interference, so the vortex signal is far from the ideal sine wave signal, but a mixed signal mixed with strong noise. On the basis of establishing noise template and signal template, the spectrum analysis method is used to eliminate strong noise in vortex flowmeter, which is one of the research hotspots in recent years, and the method is used to solve the measurement problem of vortex flowmeter under strong interference. First, the frequency measurement range is segmented, and the noise template is established in different frequency bands, then the power spectrum of mixed signal and noise template are used to extract noise, and the interpolation method is used to eliminate noise, finally the frequency of the signal after eliminating noise is calculated, and the frequency spectrum correction method is used to improve the calculation precision. The above method can effectively overcome the influence of noise on measurement data. But although it is proved by a large number of experiments, the vibration generated by vortex flowmeter in the measurement process is regular.

[0004] However, after the vortex flowmeter is installed in the preset installation position, the vortex flowmeter will also vibrate due to the vibration of the adjacent pipeline, and the amplitude of the vibration is unpredictable, and of course the vibration will also affect the data output by the vortex flowmeter. The vortex flowmeter applied to measure liquid medium will cause vibration of the downstream conveying pipeline due to the Karman vortex generated in the measuring process, and the vibration of the downstream pipeline will also cause the vortex flowmeter to generate resonance. In general, of course, the vibration can be added to the noise template to reduce the influence of the vibration on the measurement by extracting environmental noise and eliminating noise. However, since the vibration caused by the environment actually exists, when the vortex flowmeter is vibrated due to the vibration of the adjacent pipeline, the vibration is unpredictable, and therefore the vortex flowmeter will bring unpredictable influence on the measurement of the liquid medium, thereby causing a large deviation between the flow measurement data obtained by the vortex flowmeter and the actual flow value. Therefore, on the basis of the prior art, the influence of system vibration on the measurement data of the vortex flowmeter is reduced, and the performance of the vortex flowmeter is improved. SUMMARY

[0005] In view of the defects of the prior art, the vortex flowmeter can reduce the influence of vibration of the adjacent pipeline on the vortex flowmeter, and can overcome the defects in the prior art.

[0006] The technical scheme adopted by the utility model discloses a vortex flowmeter, including the measuring pipe, be provided with the vortex generator in the measuring pipe, be provided with the flow sensor on the measuring pipe of vortex generator one side, be provided with the support cylinder on the flow sensor and the measuring pipe, be provided with the meter head on the support cylinder, be provided with the connecting device on the measuring pipe, the connecting device includes the first flange, the second flange is provided with on the one side of the first flange close to the flow sensor, the first fastening screw that is provided with a plurality of star type distribution in the outer side of the central axis of the measuring pipe on the first flange and the second flane and the first fastening nut that is provided with on each first fastening screw respectively, be provided with the buffer device on the connecting device, the buffer device includes the first clamping groove that is opened on the one side of the first flange towards the second flange between two adjacent first fastening screws, the second clamping groove that is opened on the one side of the second flange towards the first flange on the one side of the first clamping groove, the connecting clamp block that is provided in the first clamping groove and the second clamping groove, the rubber layer that is provided outside the connecting clamp block in the second clamping groove and the first clamping groove, and the connecting hole that is opened on the connecting clamp block outside the rubber layer.

[0007] Preferably, the number of the connecting devices is two, one of the connecting devices is installed on one end of the measuring pipe, the other end of the measuring pipe is provided with a connecting pipe, the connecting pipe and the measuring pipe are provided with a flow regulating orifice plate, the end of the connecting pipe away from the measuring pipe is provided with the other connecting device; the first flange of the corresponding connecting device on the measuring pipe is fixedly installed on the measuring pipe, the second flange of the corresponding connecting device on the measuring pipe is movably sleeved on the measuring pipe, the first flange of the corresponding connecting device on the connecting pipe is fixedly installed on the connecting pipe, and the second flange of the corresponding connecting device on the connecting pipe is movably sleeved on the connecting pipe.

[0008] Preferably, the number of the buffer devices installed on each of the connecting devices is several, the several buffer devices of each of the connecting devices are uniformly distributed outside the central axis of the corresponding first flange, and the central axis of each of the first flanges, the central axis of each of the second flanges, the central axis of the measuring pipe and the central axis of the connecting pipe are located on the same axis.

[0009] Preferably, the end of the measuring pipe close to the flow regulating orifice plate is provided with a third flange, the end of the connecting pipe close to the flow regulating orifice plate is provided with a fourth flange, the end of the third flange close to the fourth flange is provided with a third clamping groove, the end of the fourth flange close to the third flange is provided with a fourth clamping groove, and the flow regulating orifice plate is installed in the fourth clamping groove and the third clamping groove.

[0010] Preferably, the end of the measuring pipe away from the flow sensor and the end of the first flange close to the flow sensor are provided with a first sealing ring pad, and the end of the connecting pipe away from the flow sensor and the end of the first flange close to the flow sensor are provided with a second sealing ring pad.

[0011] Preferably, the third sealing ring pad is arranged between the third flange and the flow regulating orifice plate, and the fourth sealing ring pad is arranged between the flow regulating orifice plate and the fourth flange, the second fastening screw is arranged on the third flange and the fourth flange, and the second fastening nut is arranged on the second fastening screw.

[0012] The utility model discloses beneficial effect is: the utility model discloses the connecting hole in the connecting device is convenient for installing the product to the basis of the preset position utilizes the rubber layer of connecting clamp block to block the transmission of mechanical wave and reduce the vibration of adjacent pipeline to the interference of vortex shedding flowmeter, and the vibration of the product itself can also form the buffer through the rubber layer of connecting clamp block, first sealing ring pad and second sealing ring pad and block the transmission of corresponding mechanical wave, reduce the vibration of adjacent pipeline.

[0013] The utility model discloses simple structure, convenient operation, clever design, improve work efficiency greatly, have very good social and economic benefits, be easy to use the product of generalization. DRAWINGS

[0014] Figure 1 The sectional structure schematic view of the utility model.

[0015] Figure 2 The Figure 1 The partial enlarged schematic view of detail A.

[0016] Figure 3 The Figure 1 The partial enlarged schematic view of detail B.

[0017] Figure 4 The structure schematic view of the utility model. Specific implementation

[0018] As Figures 1 to 4 The utility model discloses a vortex flowmeter, including the measuring pipe 1, be provided with vortex generator 2 in the measuring pipe 1, be provided with flow sensor 3 on the measuring pipe 1 of vortex generator 2 one side, be provided with support cylinder 4 on flow sensor 3 and the measuring pipe 1, be provided with the meter head 5 on support cylinder 4, the measuring pipe 1 be provided with connecting device, the connecting device include first flange 6, the second flange 7 of first flange 6 is provided with on the side close to flow sensor 3, the first fastening screw 8 of a plurality of star type distribution in the first fastening screw 8 of first flange 6 and second flange 7 and be provided with on the outer side of the central axis of measuring pipe 1 and the first fastening nut 9 of being provided with on every first fastening screw 8 respectively, the connecting device be provided with buffer device, the buffer device include the first clamping groove 10 of the first flange 6 of two adjacent first fastening screw 8 between towards the side of second flange 7, the second clamping groove 11 of second flange 7 towards the first flange 6 side of first clamping groove 10 side is seted up, be provided with connecting clamp block 12 in first clamping groove 10 and second clamping groove 11, be provided with rubber layer 13 on the outer side of connecting clamp block 12 in second clamping groove 11 and first clamping groove 10, and be provided with connecting hole 14 on the connecting clamp block 12 of rubber layer 13 outer side.

[0019] The number of the connecting device is two, one of the connecting device is installed on one end of the measuring pipe 1, and further, in order to reduce the turbulence of the medium carried out by the outlet end of the measuring pipe 1, the other side of the measuring pipe 1 is provided with a connecting pipe 15, the connecting pipe 15 and the measuring pipe 1 are provided with a flow regulating orifice plate 16, and the other end of the connecting pipe 15 away from the measuring pipe 1 is provided with the other connecting device; the first flange 6 of the corresponding connecting device on the measuring pipe 1 is fixedly installed on the measuring pipe 1, the second flange 7 of the corresponding connecting device on the measuring pipe 1 is movably sleeved on the measuring pipe 1, the first flange 6 of the corresponding connecting device on the connecting pipe 15 is fixedly installed on the connecting pipe 15, and the second flange 7 of the corresponding connecting device on the connecting pipe 15 is movably sleeved on the connecting pipe 15. The medium carried with turbulence which is transported out of the outlet end of the measuring pipe 1 is regulated by the flow regulating orifice plate 16 to eliminate the turbulence, although the flow regulating orifice plate 16 also vibrates during the regulating process; but the vibration is related to the flow of the liquid medium passing through the measuring pipe 1, and in the correction process, the noise caused by the vibration can be added to the noise template by correction to overcome. Preferably, the number of the buffer device installed on each of the connecting devices is several, and the several buffer devices of each of the connecting devices are uniformly distributed outside the central axis of the corresponding first flange 6, and the central axis of each first flange 6, the central axis of each second flange 7, the central axis of the measuring pipe 1 and the central axis of the connecting pipe 15 are located on the same axis. So as to reduce the turning of the liquid medium passing through the measuring pipe 1 and the connecting pipe 15.

[0020] The end of the measuring pipe 1 close to the flow regulating orifice plate 16 is provided with a third flange 17, the end of the connecting pipe 15 close to the flow regulating orifice plate 16 is provided with a fourth flange 18, the third flange 17 close to the fourth flange 18 is provided with a third clamping groove 19, the fourth flange 18 close to the third flange 17 is provided with a fourth clamping groove 20, and the flow regulating orifice plate 16 is installed in the fourth clamping groove 20 and the third clamping groove 19. So as to facilitate the position limitation of the flow regulating orifice plate 16. Further, the end of the measuring pipe 1 away from the flow sensor 3 and the end of the first flange 6 close to the flow sensor 3 are provided with a first sealing ring 21,

[0021] A second sealing ring gasket 22 is provided on the end of the connecting pipe 15 away from the flow sensor 3 and the end of the adjacent first flange 6 away from the flow sensor 3. Both the first sealing ring gasket 21 and the second sealing ring gasket 22 are annular structures made of rubber. Installing the first sealing ring gasket 21 helps reduce the gap between the liquid medium from the end of the measuring pipe 1 away from the flow sensor 3 and the adjacent system pipeline, and also provides a buffer between the measuring pipe 1 and the adjacent system pipeline to effectively block mechanical waves. Installing the second sealing ring gasket 22 helps reduce the gap between the liquid medium from the end of the connecting pipe 15 away from the flow sensor 3 and the adjacent system pipeline, and also provides a buffer between the connecting pipe 15 and the adjacent system pipeline to effectively block mechanical waves. It is worth mentioning that a third sealing ring gasket 23 is provided between the third flange 17 and the orifice plate 16, and between the orifice plate 16 and the fourth flange 18. A second fastening screw 24 is provided on the third flange 17 and the fourth flange 18, and a second fastening nut 25 is provided on the second fastening screw 24. The central axis of the measuring pipe 1, the central axis of the third flange 17, and the central axis of the fourth flange 18 are located on the same axis. The number of the second fastening screws 24 is several, and the several second fastening screws 24 are evenly distributed in a star shape on the outer side of the central axis of the measuring tube 1. Each second fastening screw 24 is equipped with a second fastening nut 25.

[0022] The instructions for using this product are as follows: Figures 1 to 4 As shown, the installation of this product should be completed before it is officially put into use. Unlike existing technologies, this product has a pre-set installation location on the system pipeline connection end, which should be fitted with a connecting flange that matches several connection holes 14 in the buffer device on the connecting device. During on-site installation, firstly, a flow rectifier plate 16 is installed between the third flange 17 and the fourth flange 18, and corresponding third sealing ring gaskets 23 are installed between the third flange 17 and the flow rectifier plate 16, and between the flow rectifier plate 16 and the fourth flange 18, respectively. Then, the third flange 17 and the fourth flange 18 are secured using the second fastening screw 24 and the second fastening nut 25. After the initial setup, the rectifier orifice plate 16, the first sealing ring gasket 21, the third sealing ring gasket 23, the connecting pipe 15, and the measuring pipe 1 are installed. Then, the buffer devices are installed on the corresponding connecting devices on the measuring pipe 1 and the connecting devices on the connecting pipe 15. The installation positions of the buffer devices installed on each connecting device are fixed by the corresponding first fastening screws 8 and first fastening nuts 9. Finally, the product is installed in the reserved installation position of the system. The connecting holes 14 on the buffer devices installed on each connecting device are aligned with the mounting holes of the connecting flanges installed on the adjacent system pipes and fixed, thereby realizing the installation of the product.

[0023] In the formal operation process, the medium transported by the upstream system pipeline is transported to the measuring pipe 1, and after the Karman vortex street generated by the vortex generator 2 is detected by the flow sensor 3, a signal is generated, and the medium containing the Karman vortex street continues to move forward, and after being rectified by the rectifying orifice plate 16, it is transported to the downstream system pipeline through the connecting pipe 15. During the operation of the product, vibration is generated in the vortex generator 2 and the rectifying orifice plate 16, and the generated vibration is buffered by the rubber layer 13, the first sealing ring pad 21 and the second sealing ring pad 22 of the buffer device to block the mechanical wave transmitted to the upstream system pipeline and the downstream system pipeline, thereby reducing the vibration generated by the upstream system pipeline and the downstream system pipeline; at the same time, the vibration generated by the upstream system pipeline or the downstream system pipeline can also be buffered by the rubber layer 13, the first sealing ring pad 21 and the second sealing ring pad 22 of the buffer device, thereby blocking the transmission of mechanical waves.

[0024] In the embodiment, the connecting hole 14 in the connecting device facilitates the installation of the product to the preset position, and the rubber layer 13 of the connecting clamp block 12 blocks the transmission of mechanical waves to reduce the vibration of the adjacent pipeline to the vortex flowmeter, and the vibration generated by the product itself can also be buffered by the rubber layer 13, the first sealing ring pad 21 and the second sealing ring pad 22 of the connecting clamp block 12 to block the transmission of the corresponding mechanical waves, thereby reducing the vibration of the adjacent pipeline.

[0025] The above-mentioned embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the present application. Therefore, equivalent changes or modifications made in accordance with the structure, features and principles described in the patent range of the present application should be included in the patent range of the present application.

Claims

1. A vortex flowmeter characterized by: The utility model provides a flow sensor, including measuring tube (1), vortex generator (2) is arranged in measuring tube (1), flow sensor (3) is arranged on the one side of vortex generator (2) of measuring tube (1), flow sensor (3) and measuring tube (1) are provided with support cylinder (4), support cylinder (4) is provided with meter head (5), measuring tube (1) is provided with connecting device, connecting device includes first flange (6), second flange (7) is arranged on the side of first flange (6) close to flow sensor (3), a plurality of first fastening screw (8) that is arranged on first flange (6) and second flange (7) is in the outer side of the central axis of measuring tube (1) and is in star type distribution and is arranged respectively on each first fastening screw (8) first fastening nut (9), connecting device is provided with buffer device, first flange (6) is opened first clamping groove (10) on the side of second flange (7) towards between two adjacent first fastening screw (8), second flange (7) is opened second clamping groove (11) on the side of first flange (6) towards, connecting clamp block (12) is arranged in first clamping groove (10) and second clamping groove (11), rubber layer (13) is arranged on the outer side of connecting clamp block (12) in second clamping groove (11) and first clamping groove (10), and connecting hole (14) is opened on the connecting clamp block (12) of the outer side of rubber layer (13).

2. The vortex flowmeter of claim 1, wherein: The quantity of connecting device adopts two, one connecting device is installed at one end of measuring tube (1), and the other side of measuring tube (1) is provided with connecting pipe (15), and rectifier hole plate (16) is arranged between connecting pipe (15) and measuring tube (1), and another connecting device is installed on the end of connecting pipe (15) away from measuring tube (1);The first flange (6) of corresponding connecting device on measuring tube (1) is fixedly installed on measuring tube (1), and the second flange (7) of corresponding connecting device on measuring tube (1) is movably sleeved on measuring tube (1), and the first flange (6) of corresponding connecting device on connecting pipe (15) is fixedly installed on connecting pipe (15), and the second flange (7) of corresponding connecting device on connecting pipe (15) is movably sleeved on connecting pipe (15).

3. The vortex flowmeter of claim 2, wherein: The quantity of buffer device installed on each connecting device adopts several, and the several of each buffer device are evenly distributed in the outer side of the central axis of corresponding first flange (6) in star type, and the central axis of each first flange (6), the central axis of each second flange (7), the central axis of measuring tube (1) and the central axis of connecting pipe (15) are located on the same axis.

4. The vortex flowmeter of claim 2, wherein: The third flange (17) is arranged on one end of the measuring tube (1) close to the rectifying orifice plate (16), the fourth flange (18) is arranged on one end of the connecting tube (15) close to the rectifying orifice plate (16), the third clamping groove (19) is arranged on one end of the third flange (17) close to the fourth flange (18), the fourth clamping groove (20) is arranged on one end of the fourth flange (18) close to the third flange (17), and the rectifying orifice plate (16) is installed in the fourth clamping groove (20) and the third clamping groove (19).

5. The vortex flowmeter of claim 4, wherein: The first sealing ring pad (21) is arranged on one end of the measuring tube (1) far from the flow sensor (3) and one end of the first flange (6) far from the flow sensor (3), and the second sealing ring pad (22) is arranged on one end of the connecting tube (15) far from the flow sensor (3) and one end of the first flange (6) far from the flow sensor (3).

6. The vortex flowmeter of claim 4, wherein: The third sealing ring pad (23) is arranged between the third flange (17) and the rectifying orifice plate (16) and between the rectifying orifice plate (16) and the fourth flange (18), respectively, the second fastening screw (24) is arranged on the third flange (17) and the fourth flange (18), and the second fastening nut (25) is arranged on the second fastening screw (24).

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