CN112360814B - Stomach type suction tube non-uniform inflow active control device and pump - Google Patents
Stomach type suction tube non-uniform inflow active control device and pump Download PDFInfo
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- CN112360814B CN112360814B CN202011071555.7A CN202011071555A CN112360814B CN 112360814 B CN112360814 B CN 112360814B CN 202011071555 A CN202011071555 A CN 202011071555A CN 112360814 B CN112360814 B CN 112360814B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4293—Details of fluid inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a non-uniform inflow active control device and a pump of a stomach type suction tube, which comprise a preposed stomach type bent tube and a flow-adapting blade, wherein the inlet direction of the preposed stomach type bent tube is vertical to the outlet direction, and the interior of the preposed stomach type bent tube is sequentially provided with an inlet tapered section, a direct-current section, a stomach type overflowing section, a contraction section and an outlet section according to the flow direction; the change of the cross-sectional area of the stomach type overflowing section is increased and then reduced along the flow direction, and the change of the cross-sectional area of the stomach type overflowing section is used for changing the pressure pulsation characteristic of the inflowing fluid. The flow-adapting blade is positioned in the stomach type overflowing section and is used for changing the flow state of the fluid medium in the stomach type overflowing section. The invention improves the non-uniform hook flow velocity of the impeller inlet, reduces the frequency of occurrence of paroxysmal vortex strips, improves the pressure pulsation characteristic of the pump inlet, and reduces the phenomena of vibration and noise, thereby causing the non-uniform incoming flow of the pump inlet to change, improving the performance of the pump and improving the efficiency of a pump unit.
Description
Technical Field
The invention relates to the field of fluid mechanical engineering, in particular to a stomach type suction tube non-uniform inflow active control device and a pump.
Background
Currently, in practical engineering applications, there may be a non-uniform inlet velocity profile for each type of pump that may have some impact on the performance of the pump. However, in actual operation, the uneven flow velocity of the inlet section of the pump impeller not only can generate paroxysmal vortex bands to cause the performance of the axial flow pump to be greatly reduced, but also can cause the unit to generate serious vibration and noise, and even seriously affects the safe and stable operation of a pump station.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the active control device for the nonuniform inflow of the stomach-type suction tube and the pump.
The present invention achieves the above-described object by the following technical means.
A stomach type suction tube non-uniform inflow active control device comprises a preposed stomach type bent tube and a flow-adapting blade, wherein the inlet direction of the preposed stomach type bent tube is vertical to the outlet direction, and the interior is sequentially provided with an inlet reducing section, a direct-current section, a stomach type overflowing section, a contraction section and an outlet section according to the flow direction; the change of the cross-sectional area of the stomach type overflowing section is increased and then reduced along the flow direction, and the change of the cross-sectional area of the stomach type overflowing section is used for changing the pressure pulsation characteristic of the inflowing fluid.
Further, let the maximum diameter of the inlet tapered section be D1The length of the inlet tapered section is L1Nominal diameter of the DC section is D2The maximum diameter of the constriction section is D3Nominal diameter of the outlet section is D4The length of the outlet section is L4And then:
wherein alpha is the contraction angle of the inlet tapered section; beta is the contraction angle of the contraction section.
Further, the range of the contraction angle alpha of the inlet tapered section is 15-25 degrees; the contraction angle beta of the contraction section ranges from 5 degrees to 15 degrees.
Further, let the length of the DC segment be L2The length of the contraction section is L3And then:
L2＝(1～2.5)L1，
L3＝(2.5～5.5)L1，
L4＝(0.9～1.5)L1，
D2＝D4。
further, the radius of the inner side of the stomach type overflowing section elbow is set to be R1The outside radius of the stomach type overflowing section elbow is R2And then: r1/D4The value range of the ratio of (A) to (B) is 1.3-2; r2/R1The value range of the ratio of (A) to (B) is 1.37-2.2.
Further, the flow-adapting blade is positioned in the stomach-type flow-passing section and used for changing the flow state of the fluid medium in the stomach-type flow-passing section; the flow adapting blades are axial blades or radial blades, and the blades are airfoil-shaped.
The pump comprises a pump body, an impeller and guide vanes, and is characterized in that the inlet of the pump body is provided with the non-uniform inflow active control device of the stomach-type suction pipe.
Further, the pump body can be a centrifugal pump body, an axial flow pump body or a mixed flow pump body.
Further, the nominal diameter D of the outlet section4The nominal diameter of the inlet of the pump body.
Further, the height of the front stomach-shaped bent pipe is 2.5-3 times of the nominal diameter of the inlet of the pump body.
The invention has the beneficial effects that:
the stomach type suction pipe non-uniform incoming flow active control device and the pump can actively control the non-uniform incoming flow condition caused by the reasons of poor flow state of a water inlet flow channel, secondary flow generated in an impeller chamber and the like when a pump unit actually operates, improve the non-uniform hooking flow rate of an impeller inlet, reduce the occurrence frequency of paroxysmal vortex strips, improve the pressure pulsation characteristic of a pump inlet, and reduce the phenomena of vibration and noise, so that the non-uniform incoming flow of the pump inlet is changed, the pump performance is improved, and the efficiency of the pump unit is improved.
Drawings
FIG. 1 is a schematic view of an active control device for uneven inflow of a gastric suction tube according to embodiment 1 of the present invention.
FIG. 2 is a schematic view of the active control device for uneven inflow of a gastric suction tube according to embodiment 2 of the present invention.
Fig. 3 is a cross-sectional view of fig. 2.
FIG. 4 is a schematic diagram of pressure pulsation monitoring points according to embodiments 1 and 2 of the present invention;
FIG. 5 is a frequency domain plot of pressure pulsation monitoring points for example 1 versus example 2 of the present invention;
fig. 6 is a time domain graph comparing pressure pulsation monitoring points for example 1 and example 2 of the present invention.
In the figure:
1-a stomach-type anterior bend; 101-an inlet tapered section; 102-a direct current section; 103-stomach type overflowing section; 104-a constriction; 105-an outlet section; 2-a pump body; 3-an impeller; 4-guide vanes; 5-flow-adaptive blades.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Embodiment 1 as shown in fig. 1, the non-uniform inflow active control device for a stomach-type suction tube of the present invention comprises a pre-stomach-type bent tube 1 and a flow-adapting blade 5, wherein the inlet direction of the pre-stomach-type bent tube 1 is perpendicular to the outlet direction, and the interior is sequentially provided with an inlet tapered section 101, a direct-current section 102, a stomach-type overflowing section 103, a contraction section 104 and an outlet section 105 according to the flow direction; the change of the cross-sectional area of the stomach-type flow passage section 103 is increased and then decreased along the flow direction, and is used for changing the pressure pulsation characteristic of the inflow fluid. Let the maximum diameter of the inlet tapered section 101 be D1The length of the inlet tapered section 101 is L1Nominal diameter of the dc section 102 is D2The length of the DC section 102 is L2The maximum diameter of the constriction 104 is D3The length of the constriction 104 is L3Outlet section 105 has a nominal diameter D4The length of the outlet section 105 is L4And then:
L2＝(1～2.5)L1，
L3＝(2.5～5.5)L1，
L4＝(0.9～1.5)L1，
D2＝D4。
wherein, alpha is the contraction angle of the inlet tapered section 101; beta is the contraction angle of the contraction section 104.
The contraction angle alpha of the inlet tapered section 101 ranges from 15 degrees to 25 degrees; the contraction angle beta of the contraction section 104 ranges from 5 degrees to 15 degrees.
The radius of the inner side of the elbow of the stomach type overflowing section 103 is R1The outside radius of the elbow of the stomach type overflowing section 103 is R2And then: r1/D4The value range of the ratio of (A) to (B) is 1.3-2; r2/R1The value range of the ratio of (A) to (B) is 1.37-2.2.
Embodiment 2 as shown in fig. 2 and 3, the active control device for uneven inflow of a gastric suction tube according to the present invention comprises a pre-gastric elbow 1 and a flow-adapting blade 5, wherein the inlet direction of the pre-gastric elbow 1 is perpendicular to the outlet direction, and the interior is sequentially provided with an inlet tapered section 101, a straight flow section 102, a gastric overflow section 103, a contraction section 104 and an outlet section 105 according to the flow direction; the change of the cross-sectional area of the stomach-type flow passage section 103 is increased and then decreased along the flow direction, and is used for changing the pressure pulsation characteristic of the inflow fluid. The flow-adapting blade 5 is positioned in the stomach type overflowing section 103 and is used for changing the flow state of a fluid medium in the stomach type overflowing section; the flow adapting blades 5 are axial blades or radial blades, and the blades are airfoil-shaped.
A pump comprises a pump body 2, an impeller 3 and guide vanes 4, wherein an inlet of the pump body 2 is provided with a stomach type suction pipe non-uniform inflow active control device. The pump body 2 can be a centrifugal pump body, an axial flow pump body or a mixed flow pump body. Nominal diameter D of said outlet section 1054The nominal diameter of the inlet of the pump body 2. The height of the front stomach-shaped bent pipe 1 is 2.5-3 times of the nominal diameter of the inlet of the pump body 2.
Generally, when the pump set is operated, the flow velocity at the upper wall surface of the preposed bent pipe is different from the flow velocity at the lower wall surface, which causes the inflow of the axial flow pump inlet to be in a non-uniform state, thereby generating a flow separation phenomenon. During flow separation, vortex is often generated, and the more serious part of the flow separation is vortex more obviously, so that the hydraulic loss is increased, the inlet flow velocity distribution is influenced, and the performance of the axial flow pump is reduced. When the axial-flow pump actually operates, inlet incoming flow enters the preposed stomach-shaped bent pipe through the inlet tapered section 101, quickly passes through the direct-current section 102 and then flows into the stomach-shaped flow passage section 103; the inflow is continuously gathered at the stomach type overflowing section 103, and the flow velocity of the inflow is reduced; when the flow passes through the contraction section 104, the flow area is suddenly reduced, and the flow speed of the incoming flow is further improved; and finally flows from the outlet section 105 to the impeller 3 and the vanes 4 in the pump body 2.
Fig. 4 is a schematic diagram of pressure pulsation monitoring points in embodiment 1 and embodiment 2 of the present invention, in which a pressure monitoring point DZ is disposed at an outlet of embodiment 1, and a pressure monitoring point DZ' is disposed at the same outlet of embodiment 2 and embodiment 1. As shown in fig. 5 and 6, the pressure pulsation monitoring point DZ of embodiment 1 of the present invention is better than the pressure pulsation monitoring point DZ' of embodiment 2, i.e. the pressure pulsation of the stomach-type suction tube non-uniform inflow active control device equipped with the flow-adapting blades 5 is more stable.
As can be seen from fig. 5 and 6, the present invention can actively control the non-uniform inflow condition caused by the poor flow state of the water inlet channel, the secondary flow generated in the impeller chamber, etc., improve the non-uniform hook flow rate of the impeller inlet, reduce the frequency of the paroxysmal vortex band, improve the pressure pulsation characteristic of the axial flow pump inlet, and reduce the vibration and noise phenomena, so that the non-uniform inflow of the axial flow pump inlet is changed, the performance of the axial flow pump is improved, the efficiency of the pump set is improved, and the operation stability of the axial flow pump is further improved.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. The non-uniform inflow active control device of the stomach type suction tube is characterized by comprising a preposed stomach type bent tube (1) and a flow adapting blade (5), wherein the inlet direction of the preposed stomach type bent tube (1) is vertical to the outlet direction, and an inlet tapered section (101), a direct-flow section (102), a stomach type overflowing section (103), a contraction section (104) and an outlet section (105) are sequentially arranged in the preposed stomach type bent tube (1) according to the flow direction; the change of the cross-sectional area of the stomach type overflowing section (103) is increased and then reduced along the flow direction, and is used for changing the pressure pulsation characteristic of the inflowing fluid;
let the maximum diameter of the inlet tapered section (101) be D1The length of the inlet tapered section (101) is L1The nominal diameter of the DC section (102) is D2The maximum diameter of the constriction (104) is D3The nominal diameter of the outlet section (105) is D4The length of the outlet section (105) is L4And then:
wherein alpha is the contraction angle of the inlet tapered section (101); beta is the contraction angle of the contraction section (104);
the radius of the inner side of the elbow of the stomach type overflowing section (103) is R1The outer radius of the elbow of the stomach type overflowing section (103) is R2And then: r1/D4The value range of the ratio of (A) to (B) is 1.3-2; r2/R1The value range of the ratio of (A) to (B) is 1.37-2.2.
2. The active control device for uneven inflow of a gastric suction tube according to claim 1, wherein the contraction angle α of the inlet tapered section (101) ranges from 15 ° to 25 °; the contraction angle beta of the contraction section (104) ranges from 5 degrees to 15 degrees.
3. The active control device for uneven inflow of gastric suction tube according to claim 1, wherein the length of the direct current section (102) is set to L2The length of the contraction section (104) is L3And then:
L2＝(1～2.5)L1，
L3＝(2.5～5.5)L1，
L4＝(0.9～1.5)L1，
D2＝D4。
4. the active control device for uneven inflow of a gastric suction tube according to claim 1, wherein the flow-adapting blade (5) is positioned in the gastric flow-passing section (103), the flow-adapting blade (5) is an axial blade or a radial blade, and the blade is an airfoil.
5. A pump comprising a pump body (2), an impeller (3) and guide vanes (4), characterized in that the inlet of the pump body (2) is equipped with an active control device of non-uniform inflow of gastric suction tube according to any of claims 1-4.
6. Pump according to claim 5, characterized in that the pump body (2) can be a centrifugal pump body or an axial flow pump body or a mixed flow pump body.
7. Pump according to claim 5, characterized in that the nominal diameter D of the outlet section (105)4Is the same as the nominal diameter of the inlet of the pump body (2).
8. The pump according to claim 5, characterized in that the anterior gastric bend (1) has a height of 2.5-3 times the nominal diameter of the inlet of the pump body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071555.7A CN112360814B (en) | 2020-10-09 | 2020-10-09 | Stomach type suction tube non-uniform inflow active control device and pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071555.7A CN112360814B (en) | 2020-10-09 | 2020-10-09 | Stomach type suction tube non-uniform inflow active control device and pump |
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| Publication Number | Publication Date |
|---|---|
| CN112360814A CN112360814A (en) | 2021-02-12 |
| CN112360814B true CN112360814B (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011071555.7A Active CN112360814B (en) | 2020-10-09 | 2020-10-09 | Stomach type suction tube non-uniform inflow active control device and pump |
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Citations (5)
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|---|---|---|---|---|
| CN2276086Y (en) * | 1996-06-12 | 1998-03-11 | 瞿慎华 | Pump body combined pipeline pump |
| FR2859251A1 (en) * | 2003-08-28 | 2005-03-04 | Valeo Climatisation | Pulser for heating, ventilation and/or air conditioning apparatus, has intermediate piece mounted on engine support and placed in upstream of vaned rotor, where piece and support have radial ribs to spin air in rotor direction |
| CN202559625U (en) * | 2012-05-09 | 2012-11-28 | 童龙文 | Stair armrest elbow with mushroom-shaped cross section at tail end |
| CN103277342A (en) * | 2013-06-24 | 2013-09-04 | 江苏大学 | Flow backing device of nuclear power centrifugation type excess heat discharge pump |
| CN107299916A (en) * | 2016-12-15 | 2017-10-27 | 江苏国泉泵业制造有限公司 | Submersible sewage pump with fuisw rib in a kind of bend pipe base |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4120615A (en) * | 1977-02-04 | 1978-10-17 | Allware Agencies Limited | Box fans |
| MXPA00010091A (en) * | 1999-10-21 | 2002-04-24 | Coltec Ind Inc | Multistage blowdown valve for a compressor system. |
| CN102182706B (en) * | 2011-05-24 | 2013-02-20 | 扬州大学 | S-shaped downwards horizontal axis-extending tubular pump device |
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2020
- 2020-10-09 CN CN202011071555.7A patent/CN112360814B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2276086Y (en) * | 1996-06-12 | 1998-03-11 | 瞿慎华 | Pump body combined pipeline pump |
| FR2859251A1 (en) * | 2003-08-28 | 2005-03-04 | Valeo Climatisation | Pulser for heating, ventilation and/or air conditioning apparatus, has intermediate piece mounted on engine support and placed in upstream of vaned rotor, where piece and support have radial ribs to spin air in rotor direction |
| CN202559625U (en) * | 2012-05-09 | 2012-11-28 | 童龙文 | Stair armrest elbow with mushroom-shaped cross section at tail end |
| CN103277342A (en) * | 2013-06-24 | 2013-09-04 | 江苏大学 | Flow backing device of nuclear power centrifugation type excess heat discharge pump |
| CN107299916A (en) * | 2016-12-15 | 2017-10-27 | 江苏国泉泵业制造有限公司 | Submersible sewage pump with fuisw rib in a kind of bend pipe base |
Non-Patent Citations (2)
| Title |
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| The effect of CCKB/gastrin antagonists on stimulated gastric acid secretion in the anaesthetized rat;N.J. Hayward;《Macmillan Press Ltd》;19911231;全文 * |
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