CN112555559B - Non-uniform incoming flow suppression device at pump inlet - Google Patents
Non-uniform incoming flow suppression device at pump inlet Download PDFInfo
- Publication number
- CN112555559B CN112555559B CN202011328762.6A CN202011328762A CN112555559B CN 112555559 B CN112555559 B CN 112555559B CN 202011328762 A CN202011328762 A CN 202011328762A CN 112555559 B CN112555559 B CN 112555559B
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- point
- shell
- suppression device
- pump inlet
- revolving body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
Abstract
The invention provides a pump inlet non-uniform incoming flow suppression device which comprises a shell and a revolving body, wherein an ellipsoidal cavity is arranged in the shell, two ends of the shell are provided with openings, the revolving body is arranged in the shell, and the revolving body is fixedly connected with the inner wall of the shell through a connecting column; the revolving body is formed by rotating a revolving section by 360 degrees around the center line of the shell, and the revolving section is formed by sealing an outer arc, an inner arc, a right-angle edge and a round-angle edge. By arranging the non-uniform incoming flow suppression device at the front end of the pump inlet, the original high flow rate center of water flow deviated to one side can be effectively returned to the center of the pipeline, the gradient distribution of the water flow is centrosymmetric after correction, the stress of the pump impeller and the pump shaft is balanced, the stability of the operation of the pump is ensured, and the operation efficiency of the pump is improved.
Description
Technical Field
The invention belongs to the field of fluid systems, and particularly relates to a pump inlet non-uniform incoming flow suppression device.
Background
Generally, during the water delivery process of the water pipe, the flow velocity of the water flow at the center of the water pipe is highest and gradually decreases as the edge of the water pipe is approached. However, in some special cases, the center of high flow velocity in the water pipe is shifted to one side, for example, in a drain pipe of a nuclear power plant lower chamber, the center of high flow velocity of water in the drain pipe is shifted to one side of the water pipe due to the special structure of the lower chamber.
The phenomenon of high flow rate center offset of water flow in the water pipe causes the gradient distribution of the water flow speed in the pipe to be asymmetric, so that the impeller and the pump shaft of the pump are stressed unevenly when the water pump connected to the rear end of the water pipe works, the efficiency of the pump is finally reduced, and vibration and noise are aggravated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pump inlet non-uniform incoming flow restraining device which is used for solving the problem of high flow speed center offset of water flow in a water pipe.
The present invention achieves the above-described object by the following technical means.
A pump inlet non-uniform incoming flow suppression device comprises a shell and a revolving body, wherein an ellipsoidal cavity is formed in the shell, two ends of the shell are opened, the revolving body is arranged in the shell, and the revolving body is fixedly connected with the inner wall of the shell through a connecting column;
the revolving body is formed by revolving a section by 360 degrees around the center line of the shell, and the revolving section is formed by sealing an outer arc, an inner arc, a right-angle edge and a round-angle edge; the outer arc is composed of a point P1, a point Pm and a point Pn, the point Pm is the midpoint of the outer arc, the inner arc is composed of a point Q1, a point Qm and a point Qn, the point Qm is the midpoint of the inner arc, the right-angle side is composed of two intersected sides, the end point of one side is Qn, the end point of the other side is Pn, and the corner side is composed of a curve from the point P1 to the point Q1;
the outer arc and the inner arc are convex towards the outer side of the revolving body, and the right-angle edge and the round-angle edge are convex towards the outer side of the revolving section.
Further, the distances from the central line (13) of the points P1, Pm and Pn are h1, hm and hn respectively, and satisfy 0.29D < h1 < 0.39D, 0.67D < hm < 0.77D, 0.41D < hn < 0.51D, wherein D is the diameter of the water pipe.
Furthermore, two sides of the right-angle side are perpendicular to each other, wherein the vertical side is perpendicular to the central line, and the end point of the vertical side is a point Pn.
Furthermore, the lengths of the two sides of the right-angle side are L, and the L is more than 0.23D and less than 0.39D.
Further, the distances of the points Q1 and Qm from the center line are t1 and tm, respectively, and 0.23D < t1 < 0.33D, 0.29D < tm < 0.39D are satisfied.
Furthermore, the number of the connecting columns is four, and the connecting columns are uniformly distributed on the outer side of the revolving body along the rotating circumferential direction.
Furthermore, the connecting column is of a cylindrical structure, and the diameter R meets the requirement that R is more than 0.09D and less than 0.13D.
Further, the fillet edge is respectively and smoothly connected with the outer arc and the inner arc.
Further, the outer part of the shell is of an ellipsoidal structure.
Furthermore, the size of the openings at the two ends of the shell is matched with the inner diameter of the water pipe.
The invention has the beneficial effects that:
(1) the nonuniform incoming flow suppression device is arranged at the front end of the pump inlet, so that the high flow rate center of the water flow which is originally deviated to one side can effectively return to the center of the pipeline, and the gradient distribution of the water flow is centrosymmetric after correction; and then through the correction, the stress of the pump impeller and the pump shaft is balanced, the stability of the operation of the pump is ensured, and the operation efficiency of the pump is improved.
(2) The pump inlet non-uniform inflow suppression device has a simple and compact structure, is directly connected in series at the front end of the pump through the water pipe, and does not occupy extra space.
(3) The invention gives the size requirements of each structure in the device, and the device has low loss on the total water flow velocity while ensuring excellent correction effect through the verification of analog simulation software.
Drawings
FIG. 1 is a block diagram of a pump inlet non-uniform inflow suppression device of the present invention;
FIG. 2 is a sectional view of the present invention in rotation;
FIG. 3 is a state diagram of the present invention in use;
FIG. 4(a) is a velocity profile of a water flow in a pipe with a center of high velocity offset;
FIG. 4(b) is a graph showing the velocity profile of water flow in a pipe after being inhibited by the apparatus of the present invention;
reference numerals: 1. the water pump comprises a shell, 11 water inlets, 12 water outlets, 13 center lines, 2 connecting columns, 3 revolving bodies, 31 revolving sections, 311 outer arcs, 312 inner arcs, 313 right-angle edges, 314 round-angle edges, 41 water pumps, 42 lower chambers and 43 water pipes.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The pump inlet non-uniform inflow suppression device as shown in FIG. 1 comprises a housing 1 and a rotator 3; the shell 1 is a hollow ellipsoidal structure, the front end and the rear end of the shell are open, one end of the shell is a water inlet 11, the other end of the shell is a water outlet 12, the cross sections of the water inlet 11 and the water outlet 12 are both circular, and the size of the cross sections is matched with the inner diameter D of the water pipe 43.
The solid of revolution 3 sets up inside casing 1, and the solid of revolution 3 comprises by revolving section 31 around casing 1's central line 13 rotation 360, and the outside of the solid of revolution 3 evenly is connected with four cylindrical spliced poles 2 along the direction of rotation circumference, and 2 diameters R of spliced pole satisfy: r is more than 0.09D and less than 0.13D; the revolving body 3 is fixedly connected with the inner wall of the shell 1 through the connecting column 2.
The turning section 31 shown in fig. 2 is formed by closing an outer arc 311, an inner arc 312, a right-angled edge 313 and a rounded edge 314, wherein the right-angled edge 313 is positioned at the side close to the water outlet 12, and the rounded edge 314 is positioned at the side close to the water inlet 11; the outer arc 311 is composed of a point P1, a point Pm and a point Pn, where the point Pm is an arc midpoint; the inner arc 312 is comprised of point Q1, point Qm, and point Qn, where point Qm is the arc midpoint; the right-angle side 313 is formed by intersecting a transverse side and a vertical side, wherein the transverse side is parallel to the central line 13, the end point of the transverse side is a point Qn, the vertical side is perpendicular to the central line 13, and the end point of the vertical side is a point Pn; the fillet 314 is a curve from point P1 to point Q1, and serves to smoothly connect the outer arc 311 and the inner arc 312.
The dimensions in the turning section 31 are as follows:
the distances from the center line 13 of the points P1, Pm and Pn on the outer arc 311 are h1, hm and hn respectively, which satisfy: h1 is more than 0.29D and less than 0.39D, hm is more than 0.67D and less than 0.77D, hn is more than 0.41D and less than 0.51D;
horizontal limit and perpendicular limit length are L in right angle side 313, satisfy: l is more than 0.23D and less than 0.39D;
points Q1 and Qm of inner arc 312 are at distances t1 and tm, respectively, from centerline 13, satisfying: 0.23D < t1 < 0.33D, 0.29D < tm < 0.39D.
The use examples and effects of the present invention are as follows:
as shown in fig. 3, the pump inlet non-uniform inflow suppression device of the present invention is disposed between a water pump 41 and a lower chamber 42 of a nuclear power plant, wherein a water inlet 11 of the device of the present invention is connected to a water outlet of the lower chamber 42 through a water pipe 43, and a water outlet 12 is connected to an inlet of the water pump 41 through the water pipe 43.
Simulating the condition that the water pump 41 pumps water from the lower chamber 42 by using ANSYS CFX simulation software, wherein simulation results are shown in FIG. 4(a) and FIG. 4(b), wherein FIG. 4(a) shows a flow velocity distribution diagram at a pump inlet pipeline when the non-uniform inflow suppression device is not arranged, the water pump 41 pumps water from the lower chamber 42 directly through the water pipe 43, and FIG. 4(b) shows a flow velocity distribution diagram at the pump inlet pipeline after the non-uniform inflow suppression device is arranged, and color shades are used for representing the low and high of the flow velocity in the two diagrams; from fig. 4(a) compared with fig. 4(b), it can be concluded that:
after the device is adopted, the deviation of the high flow rate center of the water flow in the pipe of the original figure 4(a) to one side is inhibited, the high flow rate center is corrected to the center of the pipe shown in the figure 4(b), and the flow rate gradient distribution is gradually reduced towards the edge in a centrosymmetric manner; FIG. 4(b) shows less overall change in shade than FIG. 4(a), i.e., the device of the present invention does not produce a large loss in overall flow rate of the water stream.
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. A pump inlet non-uniform incoming flow suppression device, characterized by: the device comprises a shell (1) and a revolving body (3), wherein an ellipsoidal cavity is arranged in the shell (1), two ends of the shell (1) are open, the revolving body (3) is arranged in the shell (1), and the revolving body (3) is fixedly connected with the inner wall of the shell (1) through a connecting column (2);
the revolving body (3) is formed by revolving a section (31) around the central line (13) of the shell (1) for 360 degrees, and the revolving section (31) is formed by closing an outer arc (311), an inner arc (312), a right-angle side (313) and a round-angle side (314); the outer arc (311) consists of a point P1, a point Pm and a point Pn, the point Pm is the midpoint of the outer arc (311), the inner arc (312) consists of a point Q1, a point Qm and a point Qn, the point Qm is the midpoint of the inner arc (312), the right-angle side (313) consists of two intersected sides, the end point of one side is Qn, the end point of the other side is Pn, and the round-angle side (314) consists of a curve from the point P1 to the point Q1; the distances from the points P1, Pm and Pn to the central line (13) are h1, hm and hn, and satisfy 0.29D < h1 < 0.39D, 0.67D < hm < 0.77D, 0.41D < hn < 0.51D, wherein D is the diameter of the water pipe (43); the distances between the points Q1 and Qm from the central line (13) are t1 and tm respectively, and 0.23D < t1 < 0.33D and 0.29D < tm < 0.39D are satisfied;
the outer arc (311) and the inner arc (312) are convex towards the outer side of the revolving body (3), and the right-angle side (313) and the round-angle side (314) are convex towards the outer side of the revolving section (31).
2. The pump inlet non-uniform inflow suppression device of claim 1, wherein: two sides of the right-angle side (313) are vertical to each other, wherein the vertical side is vertical to the central line (13), and the end point of the vertical side is a point Pn.
3. The pump inlet non-uniform inflow suppression device of claim 2, wherein: the lengths of the two sides of the right-angle side (313) are L, and the L is more than 0.23D and less than 0.39D.
4. The pump inlet non-uniform inflow suppression device of claim 1, wherein: four connecting columns (2) are uniformly distributed on the outer side of the revolving body (3) along the rotating circumferential direction.
5. The pump inlet non-uniform inflow suppression device of claim 4, wherein: the connecting column (2) is of a cylindrical structure, and the diameter R is more than 0.09D and less than 0.13D.
6. The pump inlet non-uniform inflow suppression device of claim 1, wherein: the fillet edge (314) is respectively and smoothly connected with the outer arc (311) and the inner arc (312).
7. The pump inlet non-uniform inflow suppression device of claim 1, wherein: the outer part of the shell (1) is of an ellipsoidal structure.
8. The pump inlet non-uniform inflow suppression device of claim 1, wherein: the opening sizes of the two ends of the shell (1) are matched with the inner diameter of the water pipe (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328762.6A CN112555559B (en) | 2020-11-24 | 2020-11-24 | Non-uniform incoming flow suppression device at pump inlet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328762.6A CN112555559B (en) | 2020-11-24 | 2020-11-24 | Non-uniform incoming flow suppression device at pump inlet |
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| Publication Number | Publication Date |
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| CN112555559A CN112555559A (en) | 2021-03-26 |
| CN112555559B true CN112555559B (en) | 2022-04-26 |
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| CN202011328762.6A Active CN112555559B (en) | 2020-11-24 | 2020-11-24 | Non-uniform incoming flow suppression device at pump inlet |
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2020
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| CN112555559A (en) | 2021-03-26 |
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