Pulsating differential pressure flowmeter

Abstract

The invention relates to a pulsating differential pressure flow meter, and belongs to the technical field of flow measuring devices, the pulsating differential pressure flow meter comprises a base and a pipe body detachably connected with the base, a generating body is arranged in the pipe body, and the generating body comprises a generating body bottom plate and a generating body body arranged on the generating body bottom plate; a first through hole and a second through hole are formed in the generating body bottom plate, and a first communicating hole communicated with the first through hole and a second communicating hole communicated with the second through hole are formed in the base. The generating body is arranged in the pipe body, vortexes can be generated when fluid passes through the generating body in the pipe body, the distance between the vortexes corresponds to the specific volume of the fluid, the number of the vortexes can be measured through the sensor, and the volume flow is obtained after conversion; the generating body is arranged to be in a T shape, the lift coefficient of the generating body reaches 10 times of the resistance coefficient, vortexes generated by the generating body are stronger than those generated by an existing generating body, and in a wide Reynolds number range, vortex street signals are high in stability and good in linearity.

Description

Technical Field

[0001] The invention relates to the technical field of flow measurement devices, and in particular to a pulsating differential pressure flowmeter. Background Art

[0002] In the prior art, the vortex of the vortex flowmeter is mostly through the swirl type, and the vortex generator is set at the fluid inlet. It is currently widely used in the petroleum, chemical, electric power, metallurgy, urban gas supply and other industries to measure various gas flows. It has the advantages of strong functions, wide flow range, simple operation and maintenance, and convenient installation and use. Its main working principle is to use the vortex precession phenomenon to measure the flow rate, in which the vortex precession frequency is proportional to the flow rate of the fluid. In actual industrial applications, due to the large pressure loss of the swirl precession vortex flowmeter, the vortex generated is not strong enough, which affects the measurement accuracy and limits its application in some cases. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a pulsating differential pressure flowmeter to solve the problems raised in the background technology.

[0004] In order to achieve the above-mentioned purpose of the invention, the present invention provides a pulsating pressure differential flowmeter, which includes a base and a tube body detachably connected to the base, a generator is provided inside the tube body, and the generator includes a generator bottom plate and a generator body arranged on the generator bottom plate, a first through hole and a second through hole are provided on the generator bottom plate, and a first connecting hole connected to the first through hole and a second connecting hole connected to the second through hole are provided on the base.

[0005] Furthermore, the first through hole and the second through hole are symmetrically arranged with respect to the generator body, a generator top plate is provided on the top of the generator body, two left-right symmetrical generator grooves are provided on the generator body, and the first through hole and the second through hole are respectively located below the two generator grooves.

[0006] Furthermore, the tube body comprises a mounting groove and a mounting through groove, the shedder top plate is mounted in cooperation with the mounting groove, and the shedder bottom plate is mounted in cooperation with the mounting through groove.

[0007] Furthermore, the tube body also includes a plurality of mounting threaded holes, and the plurality of mounting threaded holes and the mounting through groove are arranged on the same side. The base includes an upper support plate, and the upper support plate is provided with a plurality of mounting through holes. The positions of the mounting through holes and the mounting threaded holes correspond one to one and are connected by bolts.

[0008] Furthermore, the base also includes a lower support plate, which is arranged below the upper support plate, and the upper support plate and the lower support plate are connected by a connecting plate, and the first connecting hole and the second connecting hole pass through the upper support plate, the connecting plate, and the lower support plate in sequence.

[0009] Furthermore, the lower support plate is provided with a plurality of lower mounting holes for the entire flow meter.

[0010] Furthermore, the upper support plate is provided with a first circular groove and a second circular groove, the first circular groove connects the first connecting hole and the first through hole, the second circular groove connects the second connecting hole and the second through hole, the diameter of the first circular groove is larger than the first connecting hole and the first through hole, and the diameter of the second circular groove is larger than the second connecting hole and the second through hole.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By setting a generator in the tube body, vortices can be generated when the fluid passes through the generator in the tube body. The distance between the vortices corresponds to the specific volume of the fluid. The number of vortices can be measured by a sensor and the volume flow rate can be obtained after conversion.

[0013] By setting the generator to a T shape, its lift coefficient can reach 10 times the drag coefficient. The vortex it generates is stronger than that of the existing generator. In a wider range of Reynolds numbers, the vortex signal has high stability and good linearity. When a T-shaped generator is used in a stress flowmeter, the lower limit speed in the water test is 0.3m / s, and the lower limit speed in the normal pressure air flow standard device can be reduced to 3.5-4m / s. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0015] Figure 2 is another three-dimensional structural schematic diagram of an embodiment of the present invention;

[0016] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present invention;

[0017] Figure 4 is another cross-sectional structural schematic diagram of an embodiment of the present invention;

[0018] Figure 5 It is a schematic diagram of the enlarged three-dimensional structure of the generator of the present invention;

[0019] Figure 6 It is a schematic diagram of the enlarged main structure of the generator of the present invention;

[0020] Figure 7 It is an enlarged three-dimensional structural schematic diagram of the base of the present invention;

[0021] Figure 8 It is an enlarged three-dimensional structural schematic diagram of the tube body of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the invention, rather than all the embodiments. The embodiments of the present invention are described below in conjunction with the drawings.

[0023] refer to Figures 1 to 8 A pulsating differential pressure flowmeter comprises a base 3, a tube body 1 detachably connected to the base 3, a generator 2 is arranged inside the tube body 1, the generator 2 comprises a generator bottom plate 13 and a generator body 18 arranged on the generator bottom plate 13, a first through hole 6 and a second through hole 7 are arranged on the generator bottom plate 13, and a first communicating hole 4 communicating with the first through hole 6 and a second communicating hole 5 communicating with the second through hole 7 are arranged on the base 3;

[0024] The base 3 is connected to the tube body 1 by bolts. The generator 2 is used to generate vortices. The distance between the vortices corresponds to the specific volume of the fluid. The number of vortices and the frequency of vortex generation can be measured by a sensor, and the volume flow rate is obtained after conversion. The higher the flow rate of the fluid passing through the tube body 1, the faster the vortex frequency is generated, that is, the greater the flow rate, and vice versa.

[0025] The first through hole 6 and the second through hole 7 are channels for gas or liquid to transmit pressure. The vortex has pressure, and the pressure will be transmitted. The left and right first through holes 6 and the second through hole 7 apply pressure upward alternately. The vortices are also arranged one on the left and one on the right. When the pressure is transmitted to the piezoelectric crystal, an electric charge is generated. Finally, a waveform will be displayed on the screen, and the frequency and other data can be obtained.

[0026] The first through hole 6 and the second through hole 7 are symmetrically arranged about the generator body 18. The top of the generator body 18 is provided with a generator top plate 12. The generator body 18 is provided with two left-right symmetrical generator grooves 14. The first through hole 6 and the second through hole 7 are respectively located below the two generator grooves 14. The two generator grooves 14 are used to generate vortices. The generator 1 also includes a back plate 22 and a front plate 23. The front plate 23 is vertically arranged with the back plate 22. The front end of the front plate 23 is also provided with two symmetrically arranged inclined surfaces 24. The generator groove 14 is arranged between the front plate 23 and the back plate 22. The bottom of the generator groove 14 is lower than the front plate 23, so that the groove is formed to facilitate the generation of vortices.

[0027] The tube body 1 includes a mounting groove 15 and a mounting through groove 16. The top plate 12 of the shedder body is installed in cooperation with the mounting groove 15, and the bottom plate 13 of the shedder body is installed in cooperation with the mounting through groove 16, that is, the shedder body 2 can be disassembled and installed. During installation, the top plate 12 of the shedder body is installed through the through groove 16 and then cooperates with the mounting groove 15. After the cooperation is in place, the bottom plate 13 of the shedder body can cooperate with the mounting through groove 16, and then the four mounting through holes 11 are aligned with the four mounting threaded holes 17 one by one, and the bolts are screwed in to complete the connection;

[0028] The tube body 1 further includes four mounting threaded holes 17, and a plurality of mounting threaded holes 17 and the mounting through groove 16 are arranged on the same side. The base 3 includes an upper support plate 19, and a plurality of mounting through holes 11 are arranged on the upper support plate 19. The mounting through holes 11 correspond to the mounting threaded holes 17 in positions and are connected by bolts. The connection by bolts is convenient for disassembly and assembly, and it is convenient to replace the generator 2.

[0029] The base 3 further includes a lower support plate 20, which is disposed below the upper support plate 19. The upper support plate 19 and the lower support plate 20 are connected via a connecting plate 21. The first connecting hole 4 and the second connecting hole 5 pass through the upper support plate 19, the connecting plate 21, and the lower support plate 20 in sequence.

[0030] The lower support plate 20 is provided with a plurality of lower mounting holes 10 for the entire flow meter, which are used to fix the position of the flow meter;

[0031] The upper support plate 19 is provided with a first circular groove 8 and a second circular groove 9, the first circular groove 8 connects the first communicating hole 4 and the first through hole 6, the second circular groove 9 connects the second communicating hole 5 and the second through hole 7, the diameter of the first circular groove 8 is larger than the first communicating hole 4 and the first through hole 6, the diameter of the second circular groove 9 is larger than the second communicating hole 5 and the second through hole 7, the upper support plate 19 is connected to the tube body 1, and by providing the first circular groove 8 and the second circular groove 9 with larger diameters, it can be ensured that during the connection process, the first communicating hole 4 is completely connected to the first through hole 6, and the second communicating hole 5 is completely connected to the second through hole 7;

[0032] By setting the generator 2 in the tube 1, vortices can be generated when the fluid passes through the generator 2 in the tube 1. The distance between the vortices corresponds to the specific volume of the fluid. The number of vortices can be measured by a sensor and the volume flow rate can be obtained after conversion.

[0033] By setting the generator 1 to be T-shaped, its lift coefficient can reach 10 times the drag coefficient. The vortex it generates is stronger than that of the existing generator. In a wider range of Reynolds numbers, the vortex signal has high stability and good linearity. By using a T-shaped generator in a stress flowmeter, the lower limit speed of the test in water can reach 0.3m / s, and the lower limit speed of the test in a normal pressure air flow standard device can also be reduced to 3.5-4m / s.

[0034] The technical solution of the present invention is described above in conjunction with specific implementation methods, but it should be noted that the above descriptions are only for explaining the solution of the present invention and cannot be interpreted in any way as a specific limitation on the scope of protection of the invention. Based on the explanation here, those skilled in the art can think of other specific implementation methods or equivalent replacements of the present invention without creative work, and they will all fall within the scope of protection of the present invention.

Claims

1. A pulsating differential pressure flowmeter, characterized in that: The flow meter comprises a base (3) and a tube body (1) detachably connected to the base (3); a generator (2) is arranged inside the tube body (1); the generator (2) comprises a generator bottom plate (13) and a generator body (18) arranged on the generator bottom plate (13); a first through hole (6) and a second through hole (7) are arranged on the generator bottom plate (13); and a first connecting hole (4) connected to the first through hole (6) and a second connecting hole (5) connected to the second through hole (7) are arranged on the base (3).

2. A pulsating differential pressure flowmeter according to claim 1, characterized in that: The first through hole (6) and the second through hole (7) are symmetrically arranged with respect to the generator body (18); a generator top plate (12) is arranged on the top of the generator body (18); two left-right symmetrical generator grooves (14) are arranged on the generator body (18); the first through hole (6) and the second through hole (7) are respectively located below the two generator grooves (14).

3. A pulsating differential pressure flowmeter according to claim 2, characterized in that: The tube body (1) comprises a mounting groove (15) and a mounting through groove (16); the shedder top plate (12) is mounted in cooperation with the mounting groove (15); and the shedder bottom plate (13) is mounted in cooperation with the mounting through groove (16).

4. A pulsating differential pressure flowmeter according to claim 3, characterized in that: The tube body (1) further comprises a plurality of mounting threaded holes (17), wherein the plurality of mounting threaded holes (17) and the mounting through groove (16) are arranged on the same side, and the base (3) comprises an upper support plate (19), wherein the upper support plate (19) is provided with a plurality of mounting through holes (11), and the mounting through holes (11) correspond in position to the mounting threaded holes (17) and are connected by bolts.

5. A pulsating differential pressure flowmeter according to claim 4, characterized in that: The base (3) further comprises a lower support plate (20), wherein the lower support plate (20) is arranged below the upper support plate (19), the upper support plate (19) and the lower support plate (20) are connected via a connecting plate (21), and the first connecting hole (4) and the second connecting hole (5) both pass through the upper support plate (19), the connecting plate (21), and the lower support plate (20) in sequence.

6. A pulsating differential pressure flowmeter according to claim 5, characterized in that: The lower support plate (20) is provided with a plurality of lower mounting holes (10) for the entire flow meter.

7. A pulsating differential pressure flowmeter according to claim 5, characterized in that: The upper support plate (19) is provided with a first circular groove (8) and a second circular groove (9), the first circular groove (8) is connected with the first connecting hole (4) and the first through hole (6), the second circular groove (9) is connected with the second connecting hole (5) and the second through hole (7), the diameter of the first circular groove (8) is larger than the first connecting hole (4) and the first through hole (6), and the diameter of the second circular groove (9) is larger than the second connecting hole (5) and the second through hole (7).

Images