Vortex shedding flowmeter

Abstract

The utility model relates to the field of flow measuring instruments, in particular to a vortex shedding flowmeter which comprises a pipe body, a generating body vertically embedded in the pipe body and a flow sensor vertically arranged on one side of the generating body, a penetrating hole and a sleeve hole are formed in one side of the pipe body, and the bottom end of the sleeve hole is communicated with the top end of the penetrating hole. The diameter of the sleeve hole is not smaller than that of the penetrating hole, a first sealing ring is sleeved with the sleeve hole, the first sealing ring is arranged on a flow sensor in an interference sleeving mode, a shell with an opening in the top is arranged on the outer side of the sleeve hole, a pressure sensor is arranged in the shell, and one end of the flow sensor makes contact with the pressure sensing end of the pressure sensor. The first sealing ring is pressed and fixed to the bottom end of the sleeve hole through a pressure sensor, a shell cover is arranged on the top of the shell, a flow meter is arranged on the side, away from the pipe body, of the shell cover, a supporting pipe is arranged between the flow meter and the shell cover, and the flow meter is connected with the shell cover through the supporting pipe. The utility model provides a vortex shedding flowmeter which is accurate in pressure change detection and capable of reducing medium conveying hindrance.

Description

Technical Field

[0001] The utility model relates to the field of flow measurement instruments, and particularly relates to a vortex street flowmeter. Background Art

[0002] A vortex street flowmeter is an instrument for measuring the measured flow rate of a fluid and / or the flow rate within a selected time interval. The principle of measuring the flow rate of a vortex street flowmeter is based on the theories of Karman and Strouhal regarding the generation of vortices and the relationship between vortices and flow rate to measure the flow rate of gases, steam, or liquids and low-viscosity liquids. By vertically inserting a triangular columnar body (the generating body) into the meter body, when there is a medium flowing through the meter body, regular Karman vortices with opposite directions will be alternately generated behind the generating body. Since the separation frequency of the vortices is proportional to the flow velocity of the medium, by detecting the number of vortices with a sensor, the flow velocity of the medium can be deduced, and the volume flow rate of the measured medium can be calculated based on the diameter of the meter body. Since the vortex street flowmeter does not use moving mechanical parts, it has high reliability and low maintenance requirements, and its instrument parameters can remain stable for a long time, so it is widely used in the flow measurement fields of media such as liquids, gases, and steam.

[0003] During the use of a vortex street flowmeter, due to the blocking of the medium being transported by the generating body, the pressure of the transported medium will change after passing through the generator. Especially for the transportation of media such as gases and steam, the slight fluctuations in pressure changes may affect the transportation of the medium. Based on this, it is necessary to monitor the pressure changes in the meter body. To solve this technical problem, a pressure gauge is installed behind the vortex street flowmeter to monitor the pressure changes. However, due to factors such as the difference in the inner cavity size between the pressure gauge and the vortex street flowmeter and the relatively long distance between the pressure gauge and the vortex street flowmeter, it is unreliable to monitor the pressure changes using the pressure gauge. At the same time, the pressure gauge installed on the medium transportation pipeline will also increase the obstruction to the medium transportation, thereby affecting the transportation of the medium. Therefore, the vortex street flowmeter has limitations in monitoring the impact on medium transportation and is difficult to meet the requirements of various medium transportation. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a vortex street flowmeter with accurate pressure change detection and reduced obstruction to medium transportation to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is as follows: A vortex flowmeter includes a pipe body, a bluff body vertically embedded in the pipe body, and a flow sensor vertically arranged on one side of the bluff body. One side of the pipe body is respectively provided with a perforation and a sleeve hole. The bottom end of the sleeve hole is communicated with the top end of the perforation. The aperture of the sleeve hole is not less than that of the perforation. A first sealing ring is sleeved in the sleeve hole, and the first sealing ring is press-fitted on the flow sensor. The perforation is movably sleeved on the flow sensor. A housing with an open top is arranged outside the sleeve hole, and the housing is installed on the outer wall of the pipe body. A pressure sensor is arranged in the housing. One end of the flow sensor is in contact with the pressure-sensing end of the pressure sensor. The first sealing ring is pressed and fixed on the bottom end of the sleeve hole through the pressure sensor. A shell cover is arranged on the top of the housing, and both the shell cover and the pressure sensor are installed on the housing. A flow meter is arranged on the side of the shell cover away from the pipe body. A support pipe is arranged between the flow meter and the shell cover, and the flow meter is connected to the shell cover through the support pipe.

[0006] Preferably, first flanges are respectively arranged at both ends of the pipe body. The first flanges and the pipe body are of an integral structure. A positioning groove is arranged on the outer side of the first flange. The positioning groove adopts a circular groove structure. A positioning ring is sleeved in the positioning groove. The positioning ring and the first flange are of an integral structure. The center lines of the positioning ring, the positioning groove, the first flange, and the pipe body are all located on the same axis. The outer wall diameter of the positioning ring gradually decreases along the direction away from the bluff body.

[0007] Preferably, first sealing grooves, guiding grooves, and second sealing grooves are respectively arranged on both sides of the pipe body in sequence along the direction away from the bluff body. The first sealing grooves are communicated with the second sealing grooves through the guiding grooves. The diameter of the first sealing grooves is not greater than that of the second sealing grooves. The guiding grooves adopt a frustum-shaped groove structure. The diameter of the end of the guiding groove close to the second sealing groove is consistent with the diameter of the second sealing groove. The diameter of the end of the guiding groove close to the first sealing groove is consistent with the diameter of the first sealing groove. A second sealing ring is movably sleeved in the first sealing groove, and one side of the second sealing ring is in contact with the bottom of the first sealing groove.

[0008] Preferably, a buffer pad made of an elastic material is arranged between the shell cover and the housing. Both the shell cover and the buffer pad are installed on the housing through screws.

[0009] Preferably, mounting holes are respectively arranged on the buffer pad and the shell cover. The support pipe is sleeved in the mounting holes.

[0010] Preferably, a reinforcing sleeve is arranged above the shell cover. The bottom end of the reinforcing sleeve is installed on the top surface of the shell cover. The reinforcing sleeve is sleeved on the support pipe, and the inner diameter of the reinforcing sleeve is consistent with the outer diameter of the support pipe.

[0011] Preferably, a plurality of threaded holes are formed in the reinforcing sleeve, and the plurality of threaded holes are uniformly distributed on the reinforcing sleeve along the circumferential direction of the reinforcing sleeve. Bolts are threadedly sleeved in the plurality of threaded holes, and one end of each bolt is in contact with the support pipe, and the support pipe is clamped on the reinforcing sleeve by the bolts.

[0012] The beneficial effects of the present utility model are as follows: First, the present utility model obstructs the conveyed medium through the provided generating body, causing regularly alternating Karman vortices with opposite directions to be generated behind the generating body. By using a flow sensor to record the number of vortices, the flow velocity of the medium can be deduced, and then the volume flow rate of the measured medium can be calculated according to the caliber of the meter body. And the present utility model detects the pressure received by the flow sensor through the provided pressure sensor, so as to accurately detect the change of the pressure in the pipe body, thereby understanding the situation of the generating body obstructing the conveyed medium. Since the pressure sensor is not inserted into the pipe body 1 or the medium conveying pipeline, the pressure detection operation of the pressure sensor will not obstruct the conveyance of the medium, thus reducing the influence on the conveyance of the medium. In addition, through the provided pressure sensor, the first sealing ring and the flow sensor are pressed in the sleeve hole, thereby sealing the gap between the flow sensor and the sleeve hole to prevent the medium from leaking.

[0013] Secondly, through the provided first flange, the present utility model can install the pipe body onto the medium conveying pipeline. Through the provided positioning groove and positioning ring, it is convenient to guide the installation of the pipe body on the medium conveying pipeline and strengthen the positioning effect between the pipe body and the medium conveying pipeline. Moreover, through the provided first sealing groove and the second sealing ring, by inserting one end of the medium conveying pipeline into the first sealing groove, the second sealing ring is pressed in the first sealing groove by the medium conveying pipeline, so as to seal the gap between the medium conveying pipeline and the pipe body; then, by press-fitting a third sealing ring on the medium conveying pipeline, and using the third sealing ring to be press-fitted in the second sealing groove, the gap between the medium conveying pipeline and the pipe body is secondarily sealed to improve the sealing effect; and through the guiding groove provided on the pipe body, the medium conveying pipeline is guided to be inserted into the first sealing groove to facilitate the completion of the installation operation of the medium conveying pipeline and the pipe body.

[0014] Again, the utility model buffers the vibration of the pipe body from being transmitted to the shell, the support pipe and the flow meter through the provided buffer pads. The buffer pads and the mounting holes provided on the shell cover facilitate the connection between the inner cavity of the support pipe and the inner cavity of the shell, enabling the wires connecting the flow sensor and the pressure sensor to pass through the support pipe. Moreover, the utility model strengthens the connection between the support pipe and the shell cover through the provided reinforcement sleeve. By providing threaded holes on the reinforcement sleeve and bolts sleeved in the threaded holes, the support pipe is clamped on the reinforcement sleeve, facilitating the disassembly of the support pipe and the flow meter from the shell cover, thereby facilitating the maintenance of the support pipe and the flow meter and adjusting the orientation of the support pipe and the flow meter to facilitate reading information from the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective schematic view of the utility model.

[0016] Figure 2 is an assembly schematic view of the utility model and the medium conveying pipeline.

[0017] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0018] Figure 4 is Figure 2 an enlarged schematic view of part B in

[0019] Figure 5 is an installation explosion diagram of the pipe body, the shell and the shell cover in the utility model.

[0020] Figure 6 is an installation explosion diagram of the shell cover and the flow meter in the utility model.

[0021] Figure 7 is a half-sectional perspective view of the pipe body in the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] As Figures 1 to 7As shown in the figure, a vortex flowmeter includes a pipe body 1, a bluff body 2 vertically embedded in the pipe body 1, and a flow sensor 3 vertically arranged on one side of the bluff body 2. One side of the pipe body 1 is respectively provided with a perforation 4 and a sleeve hole 5. The bottom end of the sleeve hole 5 is communicated with the top end of the perforation 4. The aperture of the sleeve hole 5 is not less than that of the perforation 4. A first sealing ring 6 is sleeved in the sleeve hole 5. The first sealing ring 6 is interference-fitted on the flow sensor 3. The perforation 4 is movably sleeved on the flow sensor 3. A housing 7 with an open top is arranged outside the sleeve hole 5. The housing 7 is installed on the outer wall of the pipe body 1. A pressure sensor 8 is arranged in the housing 7. One end of the flow sensor 3 is in contact with the pressure sensing end of the pressure sensor 8. The first sealing ring 6 is pressed and fixed at the bottom end of the sleeve hole 5 through the pressure sensor 8. A cover 9 is arranged at the top of the housing 7. Both the cover 9 and the pressure sensor 8 are installed on the housing 7. A flow meter 10 is arranged on one side of the cover 9 away from the pipe body 1. A support pipe 11 is arranged between the flow meter 10 and the cover 9. The flow meter 10 is connected to the cover 9 through the support pipe 11. By arranging the pressure sensor 8, the pressure received by the flow sensor 3 is detected to facilitate monitoring the change of the pressure in the pipe body 1, so as to understand the flow blocking situation of the bluff body 2 to the conveyed medium. Compared with installing a pressure gauge, the distance between the bluff body 2 and the flow sensor 3 is closer, and both the flow sensor 3 and the bluff body 2 are located in the pipe body 1, so that the accuracy of the pressure change monitored by the pressure sensor 8 is greatly improved. In addition, since the pressure sensing end of the pressure sensor 8 is not inserted into the pipe body 1 or the medium conveying pipeline, the pressure detection operation of the pressure sensor 8 will not hinder the conveying of the medium, thus reducing the influence on the medium conveying. Moreover, in the present utility model, through the arranged first sealing ring 6, and the pressure sensor 8 is fixedly installed in the housing 7, the first sealing ring 6 and the flow sensor 3 are pressed and held in the sleeve hole 5 through the pressure sensor 8, so as to seal the gap between the flow sensor 3 and the sleeve hole 5 to prevent the medium from leaking.

[0023] In this embodiment, first flanges 12 are respectively arranged at both ends of the pipe body 1. The first flanges 12 and the pipe body 1 are of an integral structure. A positioning groove 13 is arranged on the outer side of the first flanges 12. The positioning groove 13 adopts a circular groove structure. A positioning ring 14 is sleeved in the positioning groove 13. The positioning ring 14 and the first flanges 12 are of an integral structure. The center lines of the positioning ring 14, the positioning groove 13, the first flanges 12 and the pipe body 1 are all located on the same axis. The outer wall diameter of the positioning ring 14 gradually becomes smaller along the direction away from the bluff body 2. A second flange is sleeved on the medium conveying pipeline. The second flange is connected to the first flanges 12 by using bolts and nuts, so as to install the pipe body 1 on the medium conveying pipeline. A guiding hole is arranged on the second flange. The inner cavity shape of the guiding hole is matched with the outer shape of the positioning ring 14 to guide and position the installation of the first flanges 12 and the second flange, so as to strengthen the positioning effect between the pipe body 1 and the medium conveying pipeline.

[0024] Specifically, on both sides of the pipe body 1, a first sealing groove 15, a guiding groove 16, and a second sealing groove 17 are sequentially formed along the direction away from the generating body 2. The first sealing groove 15 is communicated with the second sealing groove 17 through the guiding groove 16. The diameter of the first sealing groove 15 is not greater than that of the second sealing groove 17. The center lines of the first sealing groove 15, the guiding groove 16, and the second sealing groove 17 are all located on the same axis. The guiding groove 16 adopts a frustum-shaped groove structure. The diameter of the end of the guiding groove 16 close to the second sealing groove 17 coincides with the diameter of the second sealing groove 17, and the diameter of the end of the guiding groove 16 close to the first sealing groove 15 coincides with the diameter of the first sealing groove 15. A second sealing ring 18 is movably sleeved in the first sealing groove 15. One side of the second sealing ring 18 is in contact with the groove bottom of the first sealing groove 15. One end of the medium conveying pipe is inserted into the pipe body 1. The guiding groove 16 is used to guide the medium conveying pipe into the first sealing groove 15 to facilitate the insertion operation of the medium conveying pipe. The second sealing ring 18 is pressed in the first sealing groove 15 by the medium conveying pipe to seal the gap between the medium conveying pipe and the pipe body 1. An interference fit third sealing ring is sleeved on the medium conveying pipe, and the third sealing ring is in interference fit in the second sealing groove 17, so as to perform secondary sealing on the gap between the medium conveying pipe and the pipe body 1 to improve the sealing effect.

[0025] Please refer to again Figure 1 and 5 As shown, a buffer pad 19 made of an elastic material is provided between the shell cover 9 and the shell body 7. The shell cover 9 and the buffer pad 19 are both installed on the shell body 7 by screws to buffer the vibration of the pipe body 1 from being transmitted to the shell body 7, the support pipe 11, and the flow meter 10.

[0026] Specifically, mounting holes 20 are formed in both the buffer pad 19 and the shell cover 9. The support pipe 11 is sleeved in the mounting holes 20 to facilitate the communication between the inner cavity of the support pipe 11 and the inner cavity of the shell body 7, so that the wires connecting the flow sensor 3 and the pressure sensor 8 can pass through the support pipe 11, to facilitate the connection between the flow sensor 3 and the flow meter 10 through the wires. A signal transmitting module and a pressure reading module are installed in the flow meter 10. The pressure sensor 8 is connected to the signal transmitting module and the pressure reading module through wires.

[0027] In this embodiment, a reinforcing sleeve 21 is provided above the shell cover 9. The bottom end of the reinforcing sleeve 21 is installed on the top surface of the shell cover 9. The reinforcing sleeve 21 is sleeved on the support pipe 11. The inner diameter of the reinforcing sleeve 21 coincides with the outer diameter of the support pipe 11, so as to reinforce the connection between the support pipe 11 and the shell cover 9.

[0028] Specifically, a plurality of threaded holes 22 are formed in the reinforcing sleeve 21. The plurality of threaded holes 22 are uniformly distributed on the reinforcing sleeve 21 along the circumferential direction of the reinforcing sleeve 21. Bolts 23 are threadedly sleeved in the plurality of threaded holes 22. One end of each bolt 23 is in contact with the support pipe 11. The support pipe 11 is clamped on the reinforcing sleeve 21 by the bolts 23, so as to facilitate the disassembly of the support pipe 11 and the flow meter 10 from the shell cover 9, thereby facilitating the maintenance of the support pipe 11 and the flow meter 10, and adjusting the orientations of the support pipe 11 and the flow meter 10, so as to facilitate reading information from the flow meter 10.

[0029] The assembly method of this product is as follows: As Figures 1 to 7 shown, first, the first sealing ring 6 is press-fitted and sleeved on the flow sensor 3, and the first sealing ring 6 is sleeved in the sleeve hole 5, so that the detection end of the flow sensor 3 enters the inner cavity of the pipe body 1 through the through hole 4; then, the pressure sensor 8 is installed in the housing 7, so that the first sealing ring 6 is pressed in the sleeve hole 5 by the pressure sensor 8, and the wire passes through the support pipe 11, so that the wire is respectively connected to the flow meter 10, the pressure sensor 8 and the flow sensor 3, thereby connecting the pressure sensor 8 and the flow sensor 3 to the flow meter 10. Then, the bottom end of the support pipe 11 is sleeved on the reinforcing sleeve 21, and is tightened and sleeved in the threaded hole 22 by the bolts 23 to clamp the support pipe 11 on the reinforcing sleeve. After the assembly of this product is completed, it is necessary to use a standard flow meter and a standard pressure gauge to detect this product. By installing this product, the standard flow meter and the standard pressure gauge on the test pipeline, the performance of this product is judged by observing the readings of the flow meter 10, the standard flow meter and the standard pressure gauge.

[0030] The method for installing this product on the medium conveying pipeline is as follows: First, place the second sealing ring 18 in the first sealing groove 15, and press-fit and sleeve a third sealing ring on the medium conveying pipeline. Then, insert the medium conveying pipeline into the first sealing groove 15 by means of the guiding groove 16, so that the second sealing ring 18 is pressed in the first sealing groove 15 by one end of the medium conveying pipeline, and the above-mentioned third sealing ring is press-fitted and sleeved in the second sealing groove 17; at the same time, a second flange is sleeved on the medium conveying pipeline, and the second flange is connected to the first flange 12 by using bolts and nuts to install the pipe body 1 on the medium conveying pipeline. The second flange is provided with a guiding hole, and the guiding hole is sleeved on the positioning ring 14, so as to guide and position the installation of the first flange 12 and the second flange, so as to enhance the reliability between the pipe body 1 and the medium conveying pipe. Since the methods for installing this product on the test pipeline and on the conveying pipeline are the same, the method for installing this product on the test pipeline will not be repeated.

[0031] Through the embodiment, the medium being conveyed is blocked by the arranged generating body 2, so that regularly alternating Karman vortices with opposite directions are generated behind the generating body 2. By using the flow sensor 3 to record the number of vortices, the flow velocity of the medium can be deduced, and then the volume flow rate of the measured medium can be calculated according to the diameter of the meter body. And in this embodiment, the pressure sensor 8 is arranged to detect the pressure received by the flow sensor 3, so as to accurately detect the change of the pressure in the pipe body 1, thereby understanding the blocking situation of the generating body 2 on the conveyed medium. Since the pressure sensor 8 is not inserted into the pipe body 1 or the medium conveying pipeline, the pressure detection operation of the pressure sensor 8 will not impede the conveyance of the medium, thus reducing the influence on the medium conveyance. In addition, in this embodiment, by arranging the pressure sensor 8, the first sealing ring 6 and the flow sensor 3 are pressed in the sleeve hole 5, so as to seal the gap between the flow sensor 3 and the sleeve hole 5 to prevent the medium from leaking.

[0032] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent shall be included in the scope of the patent application of the present invention.

Claims

1. A vortex flowmeter, comprising a pipe body (1), a bluff body (2) vertically embedded in the pipe body (1), and a flow sensor (3) vertically arranged on one side of the bluff body (2), characterized in that: One side of the described pipe body (1) is respectively provided with a perforation (4) and a sleeve hole (5). The bottom end of the sleeve hole (5) communicates with the top end of the perforation (4). The aperture of the sleeve hole (5) is not less than that of the perforation (4). A first sealing ring (6) is sleeved in the sleeve hole (5). The first sealing ring (6) is press-fitted on the flow sensor (3). The perforation (4) is movably sleeved on the flow sensor (3). A housing (7) with an open top is arranged outside the sleeve hole (5). The housing (7) is installed on the outer wall of the pipe body (1). A pressure sensor (8) is arranged inside the housing (7). One end of the flow sensor (3) is in contact with the pressure-sensing end of the pressure sensor (8). The first sealing ring (6) is pressed and fixed on the bottom end of the sleeve hole (5) through the pressure sensor (8). A shell cover (9) is arranged at the top of the housing (7). The shell cover (9) and the pressure sensor (8) are both installed on the housing (7). A flow meter (10) is arranged on the side of the shell cover (9) away from the pipe body (1). A support pipe (11) is arranged between the flow meter (10) and the shell cover (9). The flow meter (10) is connected to the shell cover (9) through the support pipe (11).

2. The vortex flowmeter according to claim 1, characterized in that: Both ends of the described pipe body (1) are respectively provided with a first flange (12). The first flange (12) and the pipe body (1) are of an integral structure. A positioning groove (13) is arranged outside the first flange (12). The positioning groove (13) adopts a circular groove structure. A positioning ring (14) is sleeved in the positioning groove (13). The positioning ring (14) and the first flange (12) are of an integral structure. The center lines of the positioning ring (14), the positioning groove (13), the first flange (12) and the pipe body (1) are all on the same axis. The outer wall diameter of the positioning ring (14) gradually decreases along the direction away from the generating body (2).

3. The vortex flowmeter according to claim 1, characterized in that: On both sides of the described pipe body (1), a first sealing groove (15), a guiding groove (16) and a second sealing groove (17) are successively arranged along the direction away from the generating body (2). The first sealing groove (15) communicates with the second sealing groove (17) through the guiding groove (16). The diameter of the first sealing groove (15) is not greater than that of the second sealing groove (17). The guiding groove (16) adopts a frustum-shaped groove structure. The diameter of the end of the guiding groove (16) close to the second sealing groove (17) coincides with the diameter of the second sealing groove (17). The diameter of the end of the guiding groove (16) close to the first sealing groove (15) coincides with the diameter of the first sealing groove (15). A second sealing ring (18) is movably sleeved in the first sealing groove (15). One side of the second sealing ring (18) is in contact with the bottom of the first sealing groove (15).

4. The vortex flowmeter according to claim 1, characterized in that: A buffer pad (19) made of an elastic material is arranged between the shell cover (9) and the housing (7). The shell cover (9) and the buffer pad (19) are both installed on the housing (7) through screws.

5. The vortex flowmeter according to claim 4, wherein: Mounting holes (20) are arranged on both the buffer pad (19) and the shell cover (9). The support pipe (11) is sleeved in the mounting holes (20).

6. The vortex flowmeter according to claim 1, wherein: Above the described shell cover (9), a reinforcing sleeve (21) is provided. The bottom end of the reinforcing sleeve (21) is installed on the top surface of the shell cover (9). The reinforcing sleeve (21) is sleeved on the support pipe (11), and the inner diameter of the reinforcing sleeve (21) is matched with the outer diameter of the support pipe (11).

7. The vortex flowmeter according to claim 6, characterized in that: A number of threaded holes (22) are provided in the described reinforcing sleeve (21). The number of threaded holes (22) is evenly distributed along the circumferential direction of the reinforcing sleeve (21) on the reinforcing sleeve (21). A number of bolts (23) are threadedly sleeved in the threaded holes (22). One end of the bolt (23) is in contact with the support pipe (11), and the support pipe (11) is clamped on the reinforcing sleeve (21) by the bolt (23).

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