CN215980126U - Pre-rotation eliminating device for centrifugal pump inlet - Google Patents
Pre-rotation eliminating device for centrifugal pump inlet Download PDFInfo
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- CN215980126U CN215980126U CN202121813561.5U CN202121813561U CN215980126U CN 215980126 U CN215980126 U CN 215980126U CN 202121813561 U CN202121813561 U CN 202121813561U CN 215980126 U CN215980126 U CN 215980126U
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Abstract
The utility model discloses a prewhirl eliminating device for an inlet of a centrifugal pump, which comprises a water inlet, a first-stage despin grid, a first-stage shrinkage pipe, a first-stage stable pipe, a second-stage despin grid, a second-stage shrinkage pipe, a second-stage stable pipe, a third-stage despin grid and a water outlet, wherein the water inlet, the first-stage despin grid, the first-stage shrinkage pipe, the first-stage stable pipe, the second-stage despin grid, the second-stage shrinkage pipe, the second-stage stable pipe, the third-stage despin grid and the water outlet are sequentially arranged along the water flow direction, and the sizes of vortexes eliminated by the first-stage despin grid, the second-stage despin grid and the third-stage despin grid are sequentially reduced. The utility model can effectively eliminate prewhirl at the inlet flow field, greatly reduce the possibility of damage to the impeller, improve the operation stability of the whole device, and finally has the advantages of obvious rectification effect, simple structure and low cost, and can effectively ensure that the centrifugal pump always operates in a high-efficiency area.
Description
Technical Field
The utility model relates to a pre-rotation eliminating device, in particular to a pre-rotation eliminating device for an inlet of a centrifugal pump.
Background
The centrifugal pump inlet pre-rotation means that the water has not only an axial velocity component but also a tangential velocity component before entering the centrifugal pump. At present, a great deal of experimental research discovers that poor inflow structure design is the main reason causing inlet prewhirl and pump hydraulic performance reduction, and vortex can change inlet speed vectors on blades to cause the change of the operating characteristics of the centrifugal pump; uneven axial flow velocity distribution results in uneven loading of the impeller, resulting in overload and vibration of the centrifugal pump.
Therefore, it is desired to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide a prewhirl eliminating device for an inlet of a centrifugal pump, which has the advantages of obvious rectification effect, simple structure and low cost, and can effectively ensure that the centrifugal pump always operates in a high-efficiency area
The technical scheme is as follows: in order to achieve the purpose, the utility model discloses a prewhirl eliminating device for an inlet of a centrifugal pump, which comprises a water inlet, a first-stage despin grid, a first-stage shrinkage pipe, a first-stage stable pipe, a second-stage despin grid, a second-stage shrinkage pipe, a second-stage stable pipe, a third-stage despin grid and a water outlet, wherein the water inlet, the first-stage despin grid, the first-stage shrinkage pipe, the first-stage stable pipe, the second-stage despin grid, the second-stage stable pipe, the second-stage despin grid and the third-stage despin grid are sequentially arranged along the water flow direction, and the sizes of the vortexes eliminated by the first-stage despin grid, the second-stage despin grid and the third-stage despin grid are sequentially reduced.
The first-stage despin grid comprises a first-stage inner ring, a first-stage outer ring, a first-stage despin rod and a first-stage inner connecting rod, wherein the first-stage outer ring is concentrically arranged with the first-stage inner ring, the first-stage despin rod is connected with the first-stage inner ring and evenly distributed between the first-stage inner ring and the first-stage outer ring, the first-stage inner connecting rod is evenly distributed on the inner side of the first-stage inner ring, the first-stage despin rod comprises a first-stage longitudinal rod, a first-stage outer tangent rod and a first-stage outer connecting rod which are sequentially connected, the length ratio of the first-stage longitudinal rod to the length of the first-stage outer connecting rod is 3:1, the first-stage inner tangent rod comprises a first-stage inner longitudinal rod, a first-stage inner tangent rod and a first-stage inner connecting rod which are sequentially connected, and the length ratio of the first-stage inner connecting rod to the length of the first-stage inner connecting rod is 1: 2.
Preferably, the second-level rotation grid comprises a second-level inner ring, a second-level outer ring, a second-level rotation rod and a second-level inner connecting rod, the second-level rotation rod is connected with the second-level inner ring and the second-level outer ring and is uniformly distributed between the second-level inner ring and the second-level outer ring, the second-level rotation rod is uniformly distributed on the inner side of the second-level inner ring, the second-level rotation rod comprises a second-level longitudinal rod, a second-level outer connecting rod and a second-level outer connecting rod which are sequentially connected, the length ratio of the second-level outer longitudinal rod to the length of the second-level outer connecting rod is 1:3, the second-level inner connecting rod comprises a second-level inner longitudinal rod, a second-level inner connecting rod and a second-level inner connecting rod which are sequentially connected, and the length ratio of the second-level inner longitudinal rod to the length of the second-level inner connecting rod is 2.5: 1.
Furthermore, the three-level despin grid comprises a three-level inner ring, a three-level outer ring concentrically arranged with the three-level inner ring, a three-level despin rod connected with the three-level inner ring and uniformly distributed between the three-level inner ring and the three-level outer ring, and a three-level inner derpin rod uniformly distributed on the inner side of the three-level inner ring, wherein the three-level despin rod comprises a three-level longitudinal rod, a three-level outer tangent rod and a three-level outer connecting rod which are sequentially connected, the length ratio of the three-level outer longitudinal rod to the length of the three-level outer connecting rod is 1:1, and the three-level inner derpin rod comprises a three-level inner longitudinal rod, a three-level inner tangent rod and a three-level inner connecting rod which are sequentially connected, wherein the length ratio of the three-level inner longitudinal rod to the length of the three-level inner connecting rod is 1: 1.
Furthermore, the distribution spacing of the first-stage external derotation rods is D1, the distribution spacing of the second-stage external derotation rods is D3, the distribution spacing of the third-stage external derotation rods is D5, and D1 is greater than D3 is greater than D5.
Preferably, the distribution pitch of the first-stage meso-bars is D2, the distribution pitch of the second-stage meso-bars is D4, the distribution pitch of the third-stage meso-bars is D6, and D2 > D4 > D6.
Furthermore, the ratio of the diameter of the water inlet, the diameter of the first-stage stable pipe and the diameter of the second-stage stable pipe is 4: 2: 1.
preferably, the curvature radius of the primary shrinkage pipe is 20 mm-40 mm.
Furthermore, the curvature radius of the secondary shrinkage pipe is 5 mm-15 mm.
Has the advantages that: compared with the prior art, the utility model has the following advantages: firstly, three levels of despinner grids with different density distributions are arranged, and a large-size vortex is rectified by using a first level despinner grid, so that the impact loss at an inlet is reduced; the medium-sized vortex is eliminated by rectification of the second-level despin grid, and finally the small-sized vortex is effectively crushed by the third-level despin grid, so that the disturbance of the incoming flow at the inlet of the centrifugal pump is greatly reduced, and the prerotation is eliminated; meanwhile, the utility model can effectively eliminate prewhirl at the inlet flow field, greatly reduce the possibility of damage to the impeller, improve the operation stability of the whole device, and finally has the advantages of obvious rectification effect, simple structure and low cost, and can effectively ensure that the centrifugal pump always operates in a high-efficiency area.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a first-order racemization grid according to the present invention;
FIG. 3 is a schematic structural diagram of a secondary racemic grid in the present invention;
FIG. 4 is a schematic diagram of the structure of a three-stage racemic grid in the present invention.
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings.
As shown in fig. 1, the device for eliminating prewhirl at the inlet of a centrifugal pump of the present invention comprises a water inlet 1, a first despin grid 2, a first shrinking pipe 3, a first stable pipe 4, a second despin grid 5, a second shrinking pipe 6, a second stable pipe 7, a third despin grid 8 and a water outlet 9, wherein the water inlet 1, the first despin grid 2, the first shrinking pipe 3, the first stable pipe 4, the second despin grid 5, the second shrinking pipe 6, the second stable pipe 7, the third despin grid 8 and the water outlet 9 are sequentially arranged along the water flow direction, the device of the present invention is arranged at the inlet of the centrifugal pump, wherein the ratio of the diameter of the water inlet 1, the diameter of the first stable pipe 4 and the diameter of the second stable pipe 7 is 4: 2: 1.
as shown in fig. 2, the primary derotation grid 2 includes a primary inner ring 201, a primary outer ring 202, a primary outer derotation rod 203 and a primary inner derotation rod 204, wherein the primary inner ring 201 and the primary outer ring 202 are concentrically arranged, the primary outer derotation rod 203 connects the primary inner ring 201 and the primary outer ring 202, and 12 primary outer derotation rods 203 are uniformly distributed between the primary inner ring 201 and the primary outer ring 202, and the distribution distance of the primary outer derotation rods 203 is D1; the 6 first-stage inner cancellation rods 204 are uniformly distributed inside the first-stage inner ring 201, and the distribution distance of the first-stage inner cancellation rods 204 is D2. The first-stage racemic rod 203 comprises a first-stage outer longitudinal rod 2031, a first-stage outer tangent rod 2032 and a first-stage outer connecting rod 2033 which are sequentially connected, wherein the length ratio of the first-stage outer longitudinal rod 2031 to the length ratio of the first-stage outer connecting rod 2033 is 3:1, the first-stage inner tangent rod 204 comprises a first-stage inner longitudinal rod 2041, a first-stage inner tangent rod 2042 and a first-stage inner connecting rod 2043 which are sequentially connected, and the length ratio of the first-stage inner longitudinal rod 2041 to the length ratio of the first-stage inner connecting rod 2043 is 1: 2. The inlet swirl at the water inlet 1 is more, so that the first-stage outer despin rod 203 and the first-stage inner despin rod 204 with sparser density are adopted in the first-stage despin grid 2, the swirl can be effectively rectified, and the impact loss at the inlet is reduced; and then the water flow rectified by the first-stage despin grid 2 decelerates through the first-stage contraction pipe 3 and enters the first-stage stabilization pipe 4, wherein the curvature radius of the first-stage contraction pipe 3 is 20-40 mm, and the preferred curvature radius is 30 mm.
As shown in fig. 3, after being rectified by the primary derotation bar 2, the large-sized eddy in the flow field is eliminated and then enters the secondary derotation bar 5, the secondary derotation bar 5 comprises a secondary inner ring 501, a secondary outer ring 502, secondary outer derotation bars 503 and secondary inner derotation bars 504, the secondary outer derotation bars 503 connect the secondary inner ring 501 with the secondary outer ring 502, 16 secondary outer derotation bars 503 are uniformly distributed between the secondary inner ring 501 and the secondary outer ring 502, and the distribution distance between the secondary outer derotation bars 503 is D3; the 8 second-stage inner cancellation rods 504 are uniformly distributed inside the second-stage inner ring 501, and the distribution distance of the second-stage inner cancellation rods 504 is D4. The secondary racemic rod 503 comprises a secondary external longitudinal rod 5031, a secondary external tangent rod 5032 and a secondary external connecting rod 5033 which are connected in sequence, wherein the ratio of the length of the secondary external longitudinal rod 5031 to the length of the secondary external connecting rod 5033 is 1:3, the secondary internal tangent rod 504 comprises a secondary internal longitudinal rod 5041, a secondary internal tangent rod 5042 and a secondary internal connecting rod 5043 which are connected in sequence, and the ratio of the length of the secondary internal longitudinal rod 5041 to the length of the secondary internal connecting rod 5043 is 2.5: 1. The number of the second-stage inner rotation rods 504 and the second-stage rotation rods 503 on the second-stage rotation grid 5 is increased, the second-stage rotation grid 5 further eliminates medium-sized eddy currents in the incoming flow, the eliminated incoming flow flows into the third-stage rotation grid 8 after passing through the second-stage contraction pipe 6 and the second-stage stabilization pipe 7, and the curvature radius of the second-stage contraction pipe 6 is 5 mm-15 mm, preferably 10 mm.
As shown in fig. 4, the size of the eddy current eliminated by the primary racemization grid 2, the secondary racemization grid 5 and the tertiary racemization grid 8 is reduced in sequence. The three-level rotation eliminating grid 8 comprises a three-level inner ring 801, a three-level outer ring 802, three-level rotation eliminating rods 803 and three-level inner eliminating rods 804, the three-level outer eliminating rods 803 are connected with the three-level inner ring 801 and the three-level outer ring 802, 20 three-level outer eliminating rods 803 are uniformly distributed between the three-level inner ring 801 and the three-level outer ring 802, and the distribution distance of the three-level outer eliminating rods 803 is D5; the 10 three-stage inner swing rods 804 are uniformly distributed inside the three-stage inner ring 801, and the distribution distance of the three-stage inner swing rods 804 is D6. Wherein the distribution distance D1 of the first-stage outer derotation rods 203 is greater than the distribution distance D3 of the second-stage outer derotation rods 503 is greater than the distribution distance D5 of the third-stage outer derotation rods 803, the distribution distance D2 of the first-stage inner derotation rods 204 is greater than the distribution distance D4 of the second-stage inner derotation rods 504 is greater than the distribution distance D6 of the third-stage inner derotation rods 804. The tertiary racemic rod 803 comprises a tertiary longitudinal outer rod 8031, a tertiary outer tangent rod 8032 and a tertiary outer connecting rod 8033 which are sequentially connected, wherein the ratio of the length of the tertiary longitudinal outer rod 8031 to the length of the tertiary outer connecting rod 8033 is 1:1, the tertiary inner tangent rod 804 comprises a tertiary longitudinal inner rod 8041, a tertiary inner tangent rod 8042 and a tertiary inner connecting rod 8043 which are sequentially connected, and the ratio of the length of the tertiary longitudinal inner rod 8041 to the length of the tertiary inner connecting rod 8043 is 1: 1. According to the utility model, the number and density of the three-stage outer derotation rods 803 and the three-stage inner derotation rods 804 in the three-stage derotation grid 8 are the largest, so that small-scale vortex flow can be effectively broken, the disturbance of incoming flow at the inlet of the centrifugal pump is greatly reduced, and prewhirl is eliminated.
The utility model sets three-level despinner grids with different density distributions, and rectifies a large-size vortex by using the first-level despinner grid, thereby reducing the impact loss at an inlet; and the medium-sized vortex is eliminated by rectification of the secondary despin grid, and finally the small-sized vortex is effectively crushed by the tertiary despin grid, so that the disturbance of the incoming flow at the inlet of the centrifugal pump is greatly reduced, and prerotation is eliminated.
Claims (9)
1. The utility model provides a be used for centrifugal pump import to eliminate prewhirl device which characterized in that: including water inlet (1) that sets gradually along the rivers direction, a one-level despin bars (2) that are used for the rectification to eliminate the vortex, one-level shrink pipe (3), one-level steady pipe (4), a second grade despin bars (5) that are used for the rectification to eliminate the vortex, second grade shrink pipe (6), second grade steady pipe (7), a tertiary despin bars (8) and delivery port (9) that are used for the rectification to eliminate the vortex, wherein the size that vortex was eliminated to one-level despin bars (2), second grade despin bars (5) and tertiary despin bars (8) reduces in proper order.
2. The inlet de-swirl apparatus for a centrifugal pump of claim 1, wherein: the primary racemization grid (2) comprises a primary inner ring (201), a primary outer ring (202) which is concentrically arranged with the primary inner ring, a primary outer derotation rod (203) which is connected with the primary inner ring and the primary outer ring and is uniformly distributed between the primary inner ring and the primary outer ring, and a primary inner derotation rod (204) which is uniformly distributed on the inner side of the primary inner ring, wherein the primary outer derotation rod (203) comprises a primary outer longitudinal rod (2031), a primary outer tangent rod (2032) and a primary outer connecting rod (2033) which are sequentially connected, the length ratio of the primary outer longitudinal rod (2031) to the length ratio of the primary outer connecting rod (2033) is 3:1, the primary inner derotation rod (204) comprises a primary inner longitudinal rod (2041), a primary inner tangent rod (2042) and a primary inner connecting rod (2043) which are sequentially connected, and the length ratio of the primary inner longitudinal rod (2041) to the length of the primary inner connecting rod (2043) is 1: 2.
3. The inlet de-swirl apparatus for a centrifugal pump of claim 2, wherein: the secondary racemization grid (5) comprises a secondary inner ring (501), a secondary outer ring (502) which is concentrically arranged with the secondary inner ring, a secondary outer derotation rod (503) which is connected with the secondary inner ring and the secondary outer ring and is uniformly distributed between the secondary inner ring and the secondary outer ring, and a secondary inner derotation rod (504) which is uniformly distributed on the inner side of the secondary inner ring, wherein the secondary outer derotation rod (503) comprises a secondary outer longitudinal rod (5031), a secondary outer tangent rod (5032) and a secondary outer connecting rod (5033) which are sequentially connected, the length ratio of the secondary outer longitudinal rod (5031) to the length of the secondary outer connecting rod (5033) is 1:3, the secondary inner derotation rod (504) comprises a secondary inner longitudinal rod (5041), a secondary inner tangent rod (5042) and a secondary inner connecting rod (5043) which are sequentially connected, and the length ratio of the secondary inner longitudinal rod (5041) to the secondary inner connecting rod (5043) is 2.5: 1.
4. The inlet de-swirl apparatus for a centrifugal pump of claim 3, wherein: the three-stage despin grid (8) comprises a three-stage inner ring (801), a three-stage outer ring (802) which is concentrically arranged with the three-stage inner ring, a three-stage outer derpin (803) which is connected with the three-stage inner ring and the three-stage outer ring and evenly distributed between the three-stage inner ring and the three-stage outer ring, and a three-stage inner derpin (804) which is evenly distributed on the inner side of the three-stage inner ring, wherein the three-stage outer derpin (803) comprises a three-stage outer longitudinal rod (8031), a three-stage outer tangent rod (8032) and a three-stage outer connecting rod (8033) which are sequentially connected, the ratio of the length of the three-stage outer longitudinal rod (8031) to the length of the three-stage outer connecting rod (8033) is 1:1, and the three-stage inner tangent rod (8041), the three-stage inner tangent rod (8042) and the three-stage inner connecting rod (8043) which are sequentially connected are included in the three-stage inner derpin (804).
5. The inlet de-swirl apparatus for a centrifugal pump of claim 4, wherein: the distribution spacing of the first-stage external derotation rods (203) is D1, the distribution spacing of the second-stage external derotation rods (503) is D3, the distribution spacing of the third-stage external derotation rods (803) is D5, and D1 is more than D3 and more than D5.
6. The inlet de-swirl apparatus for a centrifugal pump of claim 4, wherein: the distribution distance of the first-stage inner swing rods (204) is D2, the distribution distance of the second-stage inner swing rods (504) is D4, the distribution distance of the third-stage inner swing rods (804) is D6, and D2 is more than D4 and more than D6.
7. The inlet de-swirl apparatus for a centrifugal pump of claim 1, wherein: the diameter of the water inlet (1), the diameter of the first-stage stable pipe (4) and the diameter of the second-stage stable pipe (7) are in proportion of 4: 2: 1.
8. the inlet de-swirl apparatus for a centrifugal pump of claim 1, wherein: the curvature radius of the primary shrinkage pipe (3) is 20 mm-40 mm.
9. The inlet de-swirl apparatus for a centrifugal pump of claim 1, wherein: the curvature radius of the secondary shrinkage pipe (6) is 5-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121813561.5U CN215980126U (en) | 2021-08-05 | 2021-08-05 | Pre-rotation eliminating device for centrifugal pump inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121813561.5U CN215980126U (en) | 2021-08-05 | 2021-08-05 | Pre-rotation eliminating device for centrifugal pump inlet |
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| Publication Number | Publication Date |
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| CN215980126U true CN215980126U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121813561.5U Active CN215980126U (en) | 2021-08-05 | 2021-08-05 | Pre-rotation eliminating device for centrifugal pump inlet |
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| CN (1) | CN215980126U (en) |
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2021
- 2021-08-05 CN CN202121813561.5U patent/CN215980126U/en active Active
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