Mechanism improvement of fluid rectifier

Abstract

The present invention relates to a structural improvement of a fluid rectifier for pump pipelines, which is applied to fluid transportation with low impurities. The fluid rectifier is of a cylindrical structure with an inner diameter d4, and the patent features comprise: consisting of a divergent tube, a plurality of rectifying modules, a plurality of mixed flow cylinders and other components, which is used for performing rectifying functions such as cutting, confining and guiding pipeline fluid. The rectifying module is provided with a plurality of rectifying plates, the number of which is N, 4≤N≤24; the rectifying plate is a streamlined thin plate and is trapezoidal in appearance, comprising a bottom, a top, a front edge and a rear edge, etc. The inner wall of the cylinder of the rectifying module has an axial length L3, the bottom of the rectifying plate is axially installed on the inner wall of the cylinder and extends toward the inner diameter; the bottom has a longer side L1, L1<L3, the top has a shorter side L2, L2<L1, the height from the bottom to the top is H1, H1<0.5d4, so as to ensure that the rectifying module has an open flow field; the front edge and the rear edge respectively form oblique angles θ1 and θ2 with the radial cross-section, 15°≤θ1 and θ2≤40°; the oblique edge of the front edge of the rectifying plate can prevent elongated impurities from being blocked on the rectifying plate; the pitch between two adjacent rectifying plates is Pt, the throat opening width between two adjacent rectifying plates is s, the width ratio is γ, 0.4≤γ=s / Pt≤0.85. Two groups of rectifying plates that extend relatively parallel and do not exceed the radial center line φLC and maintain the throat opening width s are called parallel modules, when two parallel modules are axially overlapped and the rectifying plates of the two parallel modules are arranged at 90 degrees, it is called a grid module, the rectifying plates will be stacked into square grids and maintain an open flow field. A module where rectifying plates extend radially and do not exceed the axis is called a radial module. The fluid rectifier can ensure smooth flow lines at the nozzle inlet of a nozzle flowmeter, and prevent downstream flow field disturbance from affecting the flow field at the nozzle throat of the nozzle flowmeter; a pressure take-out port P1 is installed on the flange at the nozzle inlet, and a pressure take-out port P2 is installed on the flange at the nozzle throat; after the fluid rectifier and the nozzle flowmeter are assembled and calibrated, the flow rate can be converted from the pressure difference △P.

Claims

1. An improved mechanism for a fluid rectifier for use in pipelines, particularly for flow measurement of the pump inlet pipe, because the pump inlet pipe has relatively low disturbance, while the pump outlet pipe has higher disturbance due to impeller rotation, making rectification and accurate measurement relatively difficult. The patented features of this cylindrical fluid rectifier include: a diffuser (diameter expanding to the pipe diameter), multiple rectifier modules (inner diameter), multiple mixing cylinders (inner diameter), and a converging tube (diameter gradually decreasing to the pipe diameter), which are used to guide the smooth flow of fluid in the pipeline. The fluid rectifier is installed in the following order: diffuser, rectifier modules, mixing cylinder. The fluid rectifier is connected to a nozzle flow meter, the inlet diameter and throat diameter of which are then connected to the pump inlet pipe of the pump. All of the above structures have flanges for connection. When the inner diameter of the mixing cylinder is equal to the inlet diameter of the nozzle flow meter, the converging tube can be omitted. The diffuser can also be omitted depending on the upstream pipe diameter. The above pipe diameter or orifice diameter relationships are as follows: The rectifier module and the mixing cylinder have the same inner diameter. The mixing cylinder is used to stabilize the flow field to reduce turbulence on the nozzle flow meter. The rectifier module has a plurality of rectifier plates, the number of which is N. The inner wall of the cylindrical part of the rectifier module has an axial length. The thickness of the rectifier plate is a streamlined thin plate with a trapezoidal outline, including a bottom, a top, a leading edge, and a trailing edge. The bottom of the rectifier plate is axially mounted on the inner wall of the cylinder and extends inward. The bottom of the rectifier plate has a longer side, < The top has a shorter side, and the height from the bottom to the top is <0.5, to ensure that the rectifier module is an open flow field that does not block foreign objects; the leading edge and the trailing edge form oblique angles with the radial section, respectively, 15°≤ and ≤40°; the pitch between two adjacent rectifier plates is Pt, and the throat opening width s between the rectifier plates has a width ratio of γ, 0.4=<γ=s / Pt=<0.85, and the area between two adjacent rectifier plates is a cutoff section, where the fluid flowing into the cutoff section will be rectified, and after flowing through the cutoff section, the diffusion energy will increase the static pressure due to the widening of the flow channel; both the leading edge and the trailing edge are composed of small rounded corners; the shape of the radial section centerline of a rectifier plate includes straight lines, single circular arcs, and multiple circular arcs; the axial section centerline of a rectifier plate is a straight line with a length; the line connecting the bottom to the top of the rectifier plate is called the mounting line; The rectifier module consists of multiple grid modules, multiple regulation modules, or a combination of multiple grid modules and multiple regulation modules.

2. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, The grid module consists of two parallel modules. The parallel module is defined as follows: the rectifier plates of the rectifier module extend parallel to each other, not exceeding the radial centerline and maintaining a gap. The mounting line forms an angle of 90 degrees, 45 degrees, or other angles with the radial centerline. The grid module is formed by axially overlapping two parallel modules with the rectifier plates of the two groups arranged at 90 degrees relative to each other. The rectifier plates are stacked into a grid, creating a grid-like flow field with rectification effects such as grid cutting, confinement, and guidance, making it particularly suitable for rectifying secondary flows. The radial centerline is cross-shaped, and the gap between the rectifier plates allows the grid module to form an open flow field. The beveled edge of the leading edge of the rectifier plate prevents long, narrow debris from clogging the rectifier plate.

3. An improvement to the mechanism of the fluid rectifier as described in claim 2, wherein, The grid formed by stacking the rectifier plates of the grid module can be rectangular or diamond-shaped.

4. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, A rectifier module in which the rectifier plate extends radially but does not exceed the axis, and a gap is maintained between the rectifier plates, is called a radial module.

5. An improvement to the mechanism of the fluid rectifier as described in claim 4, wherein, Both radial modules have rectifier plates with the same bending direction. When the two radial modules are axially overlapped and combined, flipping one of the radial modules can also form a diamond grid into a grid-like module because the rectifier plates have opposite bending directions. This grid-like module will have a rectifier effect such as grid cutting, confinement, and guidance on the flow field.

6. An improvement to the mechanism of the fluid rectifier as described in claim 4, wherein, This adjustment module is an improvement upon the radial module. The adjustment module features axial radial cross-sectional area variation to adjust axial flow velocity. It comprises: an outer radial group, an inner radial group, or a combination thereof. A plurality of rectifiers are divided into two groups, respectively disposed in the outer radial group and the inner radial group. In the outer radial group, a plurality of rectifiers extend radially from the inner wall of the cylinder, with a distance between their tops and the geometric mean diameter. The inner radial group includes a central column whose diameter is concentric with the central axis of the cylinder, and whose front and rear ends are arc-shaped apexes. A plurality of rectifiers in the inner radial group extend radially from the central column, with their tops not exceeding the geometric mean diameter and maintaining a distance from it. When the outer radial group is combined with the inner radial group, an oblique column connects the inner wall of the outer radial group's cylinder to the central column of the inner radial group. This oblique column has an integral obtuse angle structure and is parallel to the leading edge of the rectifiers in the outer radial group.

7. An improvement to the mechanism of the fluid rectifier as described in claim 6, wherein, The fairing is further improved with an airfoil section: the fairing can be made into an airfoil structure in the axial section, and its axial length is set at 1 / 3 of the position from the leading edge as the maximum thickness. The two ends gradually decrease with arcs, and the axial length is greater than or equal to more than 5 times the maximum thickness. The line of the maximum thickness from the bottom to the top can be regarded as a streamline.

8. An improvement to the mechanism of the fluid rectifier as described in claim 7, wherein, The distance between two adjacent cutoff lines is the pitch Pt. The minimum width s of the throat opening between two adjacent cutoff lines is the largest cutoff section, and its width ratio is γ, 0.4γ=s / Pt0.

85. When the airfoil-shaped fairing is used, more pressure loss can be reduced, which helps to obtain a lower head loss coefficient.

9. An improvement to the mechanism of the fluid rectifier as described in claim 7 or claim 8, wherein, The diameter of the central column of the radial inner group at the cutoff line position can be designed to have the maximum outer diameter and maintain a smooth arc shape with pointed ends.

10. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, This fluid rectifier features an open flow channel with low blockage; the rectifier plate maintains a smooth and flat flow channel, reducing head loss significantly; the multiple rectifier plates can isolate, rectify, and suppress turbulent fluids, including secondary flows, thus allowing the fluid rectifier to adjust axial velocity and suppress secondary flows; the fluid enters the mixing cylinder for further diffusion and flow stabilization, ensuring smooth flow into a nozzle inlet; the combination of the fluid rectifier and the nozzle flow meter provides a measured differential pressure, which, after calibration, is used to calculate the flow rate and for online measurement in the field.

11. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, The diffuser has a diameter from 0 to 0, and its cone angle is 0. The converging tube has a diameter from 0 to 0, and its cone angle is 0. Its length is 0. When the inner diameter of the mixing cylinder is equal to the inlet diameter of the nozzle flow meter, the converging tube can be omitted.

12. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, The pitch between two adjacent rectifier plates is Pt. The length of the mixing cylinder is determined by the throat opening width of the interceptor between the rectifier plates, because the jets flowing through the interceptor will only be fully mixed downstream.

13. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, When the fluid rectifier is installed upstream of the nozzle flow meter, it can ensure a smooth flow line at the nozzle inlet; when the fluid rectifier is installed at the impeller inlet, it can isolate the flow field disturbances generated by the impeller without affecting the flow field at the nozzle throat.

14. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, In its first application scenario, the system consists of a main pipe, a reducing T-joint, a piping system, a fluid rectifier, a nozzle flow meter, a pump inlet pipe, and an onshore pump. The onshore pump refers to a pump installed on land with its inlet connected by a pipe, including horizontal pumps and vertical pumps. The patented features of the fluid rectifier and its module installation sequence include: the regulating module, a plurality of the grid-shaped modules, the mixing cylinder, and the nozzle flow meter.

15. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, The second application scenario involves a water tank, a connecting pipe, a butterfly valve, a converging pipe, a fluid rectifier, a nozzle flow meter, a pump inlet pipe, and a land-based pump. The land-based pump refers to a pump installed on land with its inlet connected by a pipeline, including horizontal pumps and vertical pumps. The patented features of the fluid rectifier and its module installation sequence include: multiple grid modules, the regulating module, the mixing cylinder, and the nozzle flow meter.

16. An improvement to the mechanism of the fluid rectifier as described in claim 14 or claim 15, wherein, In application scenarios one and two, pressure measurement points are used. The measurement point on the inlet side of the fluid rectifier is located at the flange (pipe diameter) before the diffuser. The measurement point on the outlet side of the fluid rectifier is located at the flange (diameter) of the nozzle inlet of the nozzle flowmeter. The measurement point at the nozzle throat of the nozzle flowmeter is located at the flange (diameter) of the nozzle throat. The pressure difference between the measurement points is obtained to calculate the head loss coefficient ξ of the fluid rectifier. The pressure difference between the measurement point at the nozzle inlet and the measurement point at the nozzle throat of the nozzle flowmeter is obtained to calculate the value of the nozzle flowmeter. The combination of the fluid rectifier and the nozzle flowmeter can provide a measured pressure difference. After calibration, the actual value is obtained to calculate the flow rate. If necessary, the grid module and the regulating module can be added before a mixing cylinder to improve the data validity.

17. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, The third application scenario involves a low-suction pump, pump casing, impeller, impeller inlet, nozzle flow meter, mixing cylinder, and radial outer assembly. The low-suction pump refers to a pump inlet and impeller immersed in a water tank with the pump inlet open to the water tank, such as a vertical shaft pump or a low-suction submersible pump. The patent features of this fluid rectifier and its module installation sequence include: the nozzle flow meter, the mixing cylinder, the radial outer assembly, and the impeller inlet. The diameter of the impeller inlet is [not specified], and the diameter of the radial outer assembly is [not specified]. The mixing cylinder and the nozzle flow meter are then installed on the pump casing. The radial outer assembly is used to isolate the impeller inlet from the turbulence generated by the impeller rotation.

18. An improvement to the mechanism of the fluid rectifier as described in claim 1, wherein, Its application scenario four involves a low-suction pump + impeller + nozzle flow meter + mixing cylinder + radial outer assembly + pump casing + impeller inlet + pump shaft + bearing housing. The low-suction pump refers to a situation where the pump inlet and impeller are immersed in a water tank and the pump inlet is open to the water tank, such as a vertical shaft pump or a low-suction submersible pump. The patented features of this fluid rectifier and its module installation sequence include: a bearing housing, a pump shaft, a shaft sleeve, the nozzle flow meter, the mixing cylinder, the radial outer assembly, a pump casing, and an impeller inlet. The pump shaft extends from the pump casing. The bearing housing... The flow meter is fixed to the flange of one nozzle inlet by a tripod. The mixing cylinder is then installed on the flange of the nozzle throat, and the radial outer assembly is installed on the mixing cylinder. One end of the cylindrical bushing is fixed to the bearing seat, and the other end is fixed to the flow straightening plate of the radial outer assembly. The final assembly is to put the bushing of the completed assembly on the pump shaft and lock the radial outer assembly on the pump casing. The radial outer assembly is used to isolate the turbulence generated by the impeller rotation, while the bushing can isolate the turbulent flow field generated by the pump shaft rotation.

19. A mechanism improvement of the fluid rectifier as described in claim 17 or claim 18, wherein, The measuring point on the outlet side of the fluid rectifier is located outside the nozzle throat of the nozzle flow meter. The measuring point and the measuring point are located at the same water depth to measure the static pressure of the water tank. The pressure difference between the measuring point outside the nozzle throat and the measuring point at the nozzle throat is obtained to calculate the value of the nozzle flow meter. The combination of the fluid rectifier and the nozzle flow meter can provide a measured pressure difference. After calibration, the actual value is obtained to calculate the flow rate. Both radial outer groups have rectifier plates with the same bending direction. When the two radial outer groups are axially overlapped, one of the radial outer groups is flipped. Because the rectifier plates have opposite bending directions, they form a diamond grid to form a grid module. The radial outer group can be replaced by the grid module formed by the radial outer group when necessary.

20. An improvement to the mechanism of the fluid rectifier as described in claim 6, wherein, The structure of this rectifier module achieves non-clogging requirements while effectively rectifying the flow and further reducing the head loss coefficient of the fluid rectifier. The rectifier plate structure of the grid module can replace the function of the rectifier mesh plate and provide an open flow field to achieve non-clogging requirements. The radial outer group of the regulating module can block turbulent secondary flow, while the radial inner group can regulate the axial flow velocity. The regulating module is also an open flow field to achieve non-clogging requirements. When the airfoil rectifier plate is used, it can further reduce pressure difference loss, which helps to obtain a lower head loss coefficient. When the fluid rectifier is combined with the nozzle flow meter, it can provide measurement pressure difference. After calibration, the actual value is obtained to calculate the flow rate and is used for online measurement in the field.

21. An improvement to the mechanism of the fluid rectifier as described in claim 2, wherein, The rectifier module is composed of multiple grid modules, multiple regulating modules, or a combination of multiple grid modules and multiple regulating modules. It can also be composed solely of multiple grid modules, multiple regulating modules, a single grid module, a single regulating module, a single parallel module, or a single radial module. All the above combinations and applications must use the pressure disturbance ratio as the performance standard, where is the average pressure difference and is the root mean square value of the pressure fluctuation. When the nozzle flow meter is used, the disturbance ratio of the nozzle flow meter is , , , and when only the fluid rectifier is used, the disturbance ratio is , , .

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