CN111001301A - Flow guide disc - Google Patents
Flow guide disc Download PDFInfo
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- CN111001301A CN111001301A CN201911324841.7A CN201911324841A CN111001301A CN 111001301 A CN111001301 A CN 111001301A CN 201911324841 A CN201911324841 A CN 201911324841A CN 111001301 A CN111001301 A CN 111001301A
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- salient points
- flow velocity
- maximum flow
- spline
- outer ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Pipe Accessories (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a flow guide disc. In the flow guide disc, a plurality of spline bulges are uniformly distributed on the front surface and the back surface of a first annular area on a circular flow guide disc main body along the circumferential direction, and each spline bulge extends outwards from the inner boundary of the first annular area to the outer boundary of the first annular area; a fluid channel is formed between any two adjacent spline bulges on the same surface; the sectional areas of the normal sections of any two positions of the fluid channel are equal; a plurality of circles of salient points are distributed on the front side and the back side of the second annular area on the circular diversion disc main body; the circles where the multiple circles of salient points are located are concentric circles; the position of each circle of salient points is the position with the maximum flow velocity on the circumference; the radius of the inner boundary of the first annular region is greater than or equal to the radius of the outer boundary of the second annular region. The invention can ensure that the flow field in the diversion disc is uniformly distributed and improve the turbulent flow energy in the diversion disc.
Description
Technical Field
The invention relates to the field of a disc-tube type reverse osmosis membrane component, which is mainly used for garbage infiltration, in particular to a flow guide plate.
Background
The fluid flow channel in the current disc tube type reverse osmosis membrane component diversion disc is radial, and the salient points which are the same as odd circles or the same as even circles are arranged in the same radial direction, so that the salient points arranged on the outer circle can be influenced by the wake flow of the salient points on the inner circle. When fluid flows, the flow velocity at the center of the diversion disc is high, the turbulent flow energy is large, the shear stress at the center of the infiltration membrane is large, the flow velocity at the periphery of the diversion disc is low, the turbulent flow energy is small, and the shear stress at the periphery of the infiltration membrane is small, so that the distribution of an internal flow field is uneven. Therefore, the membrane module has serious membrane pollution problem in the actual use process, particularly the filter cake layers around the membrane are seriously accumulated, and the chemical washing is required to be carried out regularly, thereby not only increasing the secondary pollution, but also shortening the service life of the membrane.
Disclosure of Invention
The invention aims to provide a flow guide disc, which ensures that the flow field in the flow guide disc is uniformly distributed, improves the turbulent flow energy in the flow guide disc, increases the shear stress of a permeable membrane and improves the pollution resistance of the permeable membrane.
In order to achieve the purpose, the invention provides the following scheme:
a plurality of spline bulges are uniformly distributed on the front surface and the back surface of a first annular area on a circular deflector main body along the circumferential direction, and each spline bulge extends outwards from the inner boundary of the first annular area to the outer boundary of the first annular area; a fluid channel is formed between any two adjacent spline bulges on the same surface; the sectional areas of the normal sections of any two positions of the fluid channel are equal;
a plurality of circles of salient points are distributed on the front side and the back side of the second annular area on the circular diversion disc main body; circles where the multiple circles of salient points are located are concentric circles; the position of each circle of the salient points is the position with the maximum flow velocity on the circumference;
the radius of the inner boundary of the first annular region is greater than or equal to the radius of the outer boundary of the second annular region.
Alternatively, all the fluid channels on the same side are identical in shape.
Optionally, for any two adjacent circles of salient points on the front surface, when the maximum flow velocity paths formed by the two adjacent salient points on the outer ring are intersected in the annular region between the inner ring and the outer ring, the salient points on the inner ring are positioned on the radius passing through the middle of the two salient points on the outer ring; when the maximum flow velocity path formed by two adjacent salient points of the outer ring does not intersect in the annular region between the inner ring and the outer ring, the salient points of the inner ring are positioned on the maximum flow velocity path on the inner ring; the maximum flow velocity path is a path through which water flow of a maximum flow velocity flows; the front side is used for guiding water flow flowing from the periphery to the center, and the back side is used for guiding water flow flowing from the center to the periphery.
Optionally, for any two adjacent circles of salient points located on the reverse side, when the maximum flow velocity paths formed by the two adjacent salient points of the inner circle intersect in the annular region between the inner circle and the outer circle, the salient points of the outer circle are located on the radius passing through the middle of the two salient points of the inner circle; when the maximum flow velocity paths formed by two adjacent salient points of the inner ring do not meet in the annular area between the inner ring and the outer ring, the salient points of the outer ring are positioned on the maximum flow velocity path on the outer ring.
Optionally, the shape of the salient point is any one of a prism, a prismatic table, a cylinder and a circular table.
Optionally, the prism is a right triangular prism, and the cross section of the right triangular prism is an isosceles right triangle.
Optionally, the hypotenuse of the isosceles right triangle faces the incoming flow direction of the maximum flow velocity, and the hypotenuse of the isosceles right triangle is perpendicular to the direction of the maximum flow velocity at the position of the hypotenuse.
Optionally, for the spline bulges on the reverse side, inlets of the flow guide channels formed by any two adjacent spline bulges are located on the maximum flow velocity path formed by the convex points on the outermost circle at the corresponding positions.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the flow guiding disc disclosed by the invention has the advantages that the cross sections of all positions of the fluid channel in the first annular area on the circular flow guiding disc main body are equal, the speed of the outer ring of the circumference of the flow guiding disc is increased, and the flow field inside the flow guiding disc is uniformly distributed. The salient points are arranged at the highest flow velocity position of water flow generated by the salient points in the incoming flow direction, so that turbulence can be generated to the maximum extent, the turbulence energy in the guide disc is improved, and the pollution resistance of the guide disc and the permeable membrane is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a front structural view of a diaphragm of the present invention;
fig. 2 is a front enlarged view of the diaphragm of the present invention;
fig. 3 is a reverse structure view of the deflector of the present invention;
FIG. 4 is an enlarged view of a portion of the reverse side of the deflector of the present invention;
FIG. 5 is a spline bump layout flow chart;
FIG. 6 is a flow chart of bump layout;
fig. 7 is a diagram showing an internal turbulence energy distribution of the deflector after the circular deflector main body is completely arranged to be the salient points and simulated;
fig. 8 is a cloud chart of the internal speed of the diversion disc after the circular diversion disc main body is completely distributed with the salient points for simulation;
fig. 9 is a velocity cloud of the front face of the diaphragm of the present invention;
fig. 10 is a turbulent energy cloud on the front of the deflector of the present invention;
fig. 11 is a velocity cloud on the reverse side of the deflector of the present invention;
fig. 12 is a turbulent energy cloud on the reverse side of the deflector of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a front structural view of a diaphragm according to the present invention.
Fig. 2 is a front enlarged view of the diaphragm of the present invention.
Fig. 3 is a reverse structure view of the baffle plate of the present invention.
Fig. 4 is a reverse side partial enlarged view of the deflector of the present invention.
Referring to fig. 1 to 4, in the deflector, a plurality of spline projections 2 are uniformly distributed on the front and back of a first annular region on a circular deflector body 1 with a through hole in the center along the circumferential direction, and each spline projection 2 extends outwards from the inner boundary of the first annular region to the outer boundary of the first annular region; a fluid channel is formed between any two adjacent spline bulges 2 on the same surface; the width of each spline projection 2 gradually increases from the inner boundary of the first annular region to the outer boundary of the first annular region, so that the sectional areas of the normal cross-sections at any two positions of the fluid passage are equal.
A plurality of circles of salient points 3 are distributed on the front side and the back side of the second annular area on the circular diversion disc main body 1; the circles where the multiple circles of salient points 3 are located are concentric circles; the positions of the salient points 3 in each circle are the positions with the maximum flow velocity on the circumference.
The radius of the inner boundary of the first annular region is greater than or equal to the radius of the outer boundary of the second annular region.
All the fluid channels on the same side have the same shape.
For any two adjacent circles of salient points 3 positioned on the front surface, when the maximum flow speed paths formed by the two adjacent salient points 3 on the outer ring are intersected in the annular region between the inner ring and the outer ring, the positions of the salient points 3 on the inner ring are positioned on the radius passing through the middle of the two salient points 3 on the outer ring; when the maximum flow velocity path formed by two adjacent salient points 3 of the outer ring is not intersected in the annular area between the inner ring and the outer ring, the positions of the salient points 3 of the inner ring are positioned on the maximum flow velocity path on the inner ring; the maximum flow velocity path is a path through which the water flow with the maximum flow velocity flows; the front side is used for guiding water flow flowing from the periphery to the center, and the back side is used for guiding water flow flowing from the center to the periphery.
For any two adjacent circles of salient points 3 positioned on the reverse side, when the maximum flow speed paths formed by the two adjacent salient points 3 of the inner circle are intersected in the annular region between the inner circle and the outer circle, the salient points 3 of the outer circle are positioned on the radius passing through the middle of the two salient points 3 of the inner circle; when the maximum flow velocity paths formed by two adjacent salient points 3 of the inner ring do not meet in the annular area between the inner ring and the outer ring, the positions of the salient points 3 of the outer ring are positioned on the maximum flow velocity paths on the outer ring.
The salient points 3 are in any shape of prism, prismatic table, cylinder and circular table.
The prism is a right triangular prism, and the cross section of the right triangular prism is an isosceles right triangle. The hypotenuse of isosceles right triangle faces the incoming flow direction of the maximum flow velocity, and the hypotenuse of isosceles right triangle is perpendicular to the maximum flow velocity direction at the position. The hypotenuse of the isosceles right triangle faces the incoming flow direction of the maximum flow velocity and is perpendicular to the flow velocity direction, so that the maximum turbulence energy can be generated around the salient point 3.
For the spline bulges 2 on the opposite side, the inlets of the flow guide channels formed by any two adjacent spline bulges 2 are positioned on the maximum flow speed path formed by the convex points 3 on the outermost circle at the corresponding positions.
The spline bulges are arranged in the following mode:
FIG. 5 is a spline bump laying-out flow chart.
Referring to fig. 5, the spline bump laying process includes:
step 101: a polar coordinate system is established on the plane of the circular guide disc main body by taking the center of the circular guide disc main body as an original point and taking a certain radial axis on the circular guide disc main body as a polar axis.
Step 102: randomly selecting one point from the points with the polar diameter coordinate as the first preset distance as a first starting point. The first predetermined distance is greater than or equal to the radius of the inner boundary of the first annular region and less than the radius of the outer boundary of the first annular region.
Step 103: and sequentially determining polar angle coordinates from the second starting point to the mth starting point according to the formula (1).
θ2-θ1＝θ3-θ2＝......＝θm-θm-1＝Δθ (1)
Wherein theta is2～θmPolar angle coordinates of the second starting point to the mth starting point respectively; and delta theta is a preset polar angle difference value.
Step 104: and (3) sequentially determining the radial coordinates from the second starting point to the mth starting point according to the formula (2), thereby determining the positions of the second starting point to the mth starting point.
R2-R1＝R3-R2＝......＝Rm-Rm-1＝ΔR (2)
Wherein R is1Is the polar radial coordinate of the first starting point, R2～RmRespectively, the polar diameter coordinates from the second starting point to the mth starting point, and Δ R is a preset polar diameter difference.
Step 105: rotate L around the origin in the counterclockwise or clockwise direction with the first to mth origins as the origins, respectively1～LmObtaining the position from the first terminal point to the mth terminal point; wherein the relationship between the pole diameter and the arc length satisfies the following formula (3):
wherein L isBIs the preset arc length of the cross section of the fluid channel; l is1～LmRespectively from the arc length between the first starting point and the first terminal point to the arc length between the mth starting point and the mth terminal point; n is the number of preset fluid channels.
Step 106: fitting a curve formed from the first starting point to the mth starting point and a curve formed from the first end point to the mth end point to obtain a starting point spline curve and an end point spline curve; in order to ensure high fitting accuracy, the maximum degree of the fitting equation is not less than 4.
Step 107: and sequentially connecting the arc between the first starting point and the first terminal point, the terminal point spline curve, the arc between the mth terminal point and the mth starting point and the starting point spline curve, thereby forming a closed spline curve.
Step 108: determining the positions of a plurality of closed spline curves in the circumferential direction in sequence by taking the arc length of the section of the preset fluid channel as the arc length of two adjacent closed spline curves, thereby obtaining the convex area of each spline; the region enclosed by each enclosed spline curve is the region of the corresponding spline bulge; the spline raised regions are used to form spline projections along the axial projections of the diaphragm body to construct the fluid passages.
The invention has the following bump layout mode:
FIG. 6 is a flow chart of bump layout.
Referring to fig. 6, the bump layout process includes:
step 201: and acquiring the size of a second annular area to be provided with the salient points and the number of turns N of the salient points to be distributed.
Step 202: the position of each turn is determined according to the number of turns and the size of the second annular area. For the front surface, the outer boundary to the inner boundary of the second annular region are the 1 st turn to the Nth turn in sequence. For the opposite side, the 1 st circle to the Nth circle are sequentially arranged from the inner boundary to the outer boundary of the second annular area.
Step 203: the salient points of the 1 st circle are uniformly distributed on the 1 st circle.
Step 204: aiming at any ring to be laid, uniformly arranging the salient points of the ring to be laid at the intersection point of the maximum flow velocity path generated by the salient points of the adjacent inner rings and the ring to be laid until the uniform arrangement of the 2 nd ring to the N rings is completed; each salient point is a triangular prism with an isosceles right triangle cross section; the hypotenuse of isosceles right triangle faces the incoming flow direction of the maximum flow velocity, and the hypotenuse of isosceles right triangle is perpendicular to the maximum flow velocity direction at the position.
The step 204 specifically includes:
when the maximum flow velocity paths of two adjacent salient points in the last circle of the circle to be laid are intersected before reaching the circle to be laid, the salient points of the circle to be laid are laid at the intersection points of the radii of the middle positions of the two adjacent salient points in the last circle of the circle to be laid and the circle to be laid; when the maximum flow velocity paths of the two adjacent salient points in the last circle of the circle to be laid do not intersect before reaching the circle to be laid, the salient points of the circle to be laid are laid at the intersection points of the maximum flow velocity paths of the two adjacent salient points in the last circle of the circle to be laid and the circle to be laid.
The method for determining the maximum flow speed path comprises the following steps: simulating a flow velocity distribution cloud chart formed when water flows pass through the circular diversion disc main body by using a computational fluid dynamics method; and determining the path through which the water flow with the maximum flow velocity flows after the water flow passes through the last circle of the circle to be laid from the flow velocity distribution cloud chart.
For the reverse side, the salient points in the second annular region are laid first, and then the spline bulges in the first annular region are laid. The position of the spline bulges is selected according to the positions of the salient points at the outermost circle of the first annular area, and the inlet of the water flow channel between the spline bulges is positioned on the maximum flow speed path formed by the salient points at the outermost circle.
For the determination of the inner boundary of the first annular region or the outer boundary of the second annular region, the determination needs to be performed according to the size of turbulence energy around the salient points, that is, if a circle is set as the salient point, the turbulence energy around the salient point of the circle is greater than a critical value, and the circle is determined as the second annular region for laying the salient points; if a circle is set to be a salient point, turbulent flow energy around the salient point of the circle is smaller than or equal to a critical value, and the circle is determined to be a first annular area for arranging the spline bulges.
The manner in which the inner boundary of the first annular region or the outer boundary of the second annular region is determined is illustrated below:
fig. 7 is a diagram showing an energy distribution of turbulence inside the diaphragm after the circular diaphragm main body is completely arranged to be the convex points and is simulated.
Fig. 8 is a cloud chart of the internal velocity of the diaphragm after the circular diaphragm main body is completely arranged to be simulated by the salient points.
Referring to fig. 7 and 8, discrete salient points are all arranged inside the flow guiding disc, the salient points are in the shape of right triangular prisms, and the number of the salient points in each circle is 36.
Determining the internal turbulence structure of the flow guide disc by adopting a computational fluid dynamics analysis method, wherein the turbulence distribution around the inner five circles of salient points is discontinuous, the turbulence energy around the salient points is large, and the turbulence energy between the salient points is small (the increase of the number of discrete salient points of the inner circles or the increase of the number of discrete salient points can be considered); from the sixth circle of salient points (black boundary circles in the figure), the flow speed is obviously reduced, and the turbulence energy around the salient points is smaller (spline protrusions can be designed to increase the flow speed of the outer circle). The shape and the number of the salient points in each circle are different, the better position of the demarcation circle is different, the more the number of the salient points in each circle is, the larger the diameter of the better demarcation circle is.
Fig. 9 is a velocity cloud of the front face of the diaphragm of the present invention.
Fig. 10 is a turbulent energy cloud on the front of the deflector of the present invention.
Fig. 11 is a velocity cloud on the reverse side of the diaphragm of the present invention.
Fig. 12 is a turbulent energy cloud on the reverse side of the deflector of the present invention.
Referring to fig. 9 to 12, the present invention has the following technical effects: the flow guiding disc disclosed by the invention has the advantages that the cross sections of all positions of the fluid channel on the circular flow guiding disc main body are equal, so that the flow velocity of the outer ring of the flow guiding disc is improved, and the flow field inside the flow guiding disc is uniformly distributed. The salient points are arranged at the highest flow velocity position of water flow generated by the salient points in the incoming flow direction, so that turbulence can be generated to the maximum extent, the turbulence energy in the guide disc is improved, and the pollution resistance of the guide disc and the permeable membrane is improved.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A flow guide disc is characterized in that a plurality of spline bulges are uniformly distributed on the front surface and the back surface of a first annular area on a circular flow guide disc main body along the circumferential direction, and each spline bulge extends outwards from the inner boundary of the first annular area to the outer boundary of the first annular area; a fluid channel is formed between any two adjacent spline bulges on the same surface; the sectional areas of the normal sections of any two positions of the fluid channel are equal;
a plurality of circles of salient points are distributed on the front side and the back side of the second annular area on the circular diversion disc main body; circles where the multiple circles of salient points are located are concentric circles; the position of each circle of the salient points is the position with the maximum flow velocity on the circumference;
the radius of the inner boundary of the first annular region is greater than or equal to the radius of the outer boundary of the second annular region.
2. Flow deflector according to claim 1, wherein all fluid channels located on the same face have the same shape.
3. The diaphragm of claim 1 wherein for any two adjacent rings of lobes on the front surface, when the maximum flow velocity paths formed by the two adjacent lobes on the outer ring meet in the annular region between the inner ring and the outer ring, the lobes on the inner ring are positioned on a radius passing through the middle of the two lobes on the outer ring; when the maximum flow velocity path formed by two adjacent salient points of the outer ring does not intersect in the annular region between the inner ring and the outer ring, the salient points of the inner ring are positioned on the maximum flow velocity path on the inner ring; the maximum flow velocity path is a path through which water flow of a maximum flow velocity flows; the front side is used for guiding water flow flowing from the periphery to the center, and the back side is used for guiding water flow flowing from the center to the periphery.
4. The diaphragm of claim 3 wherein for any two adjacent rings of lobes on the opposite side, when the maximum flow velocity paths formed by the two adjacent lobes of the inner ring meet in the annular region between the inner ring and the outer ring, the lobe position of the outer ring is located on a radius passing through the middle of the two lobes of the inner ring; when the maximum flow velocity paths formed by two adjacent salient points of the inner ring do not meet in the annular area between the inner ring and the outer ring, the salient points of the outer ring are positioned on the maximum flow velocity path on the outer ring.
5. The diaphragm of claim 4 wherein the convex points are in the shape of any one of a prism, a truncated pyramid, a cylinder, and a truncated cone.
6. The diaphragm of claim 5 wherein the prisms are right triangular prisms having a cross-section that is an isosceles right triangle.
7. Flow deflector according to claim 6, wherein the hypotenuse of the isosceles right triangle faces the incoming flow direction of maximum flow velocity and is perpendicular to the direction of maximum flow velocity at the location.
8. The flow guide disc of claim 4, wherein, for the spline projections on the reverse side, the inlets of the flow guide channels formed by any two adjacent spline projections are located on the maximum flow velocity path formed by the convex points on the outermost circle at the corresponding positions.
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| CN201911324841.7A CN111001301B (en) | 2019-12-16 | 2019-12-16 | Flow guide disc |
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| CN201911324841.7A CN111001301B (en) | 2019-12-16 | 2019-12-16 | Flow guide disc |
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| CN111001301A true CN111001301A (en) | 2020-04-14 |
| CN111001301B CN111001301B (en) | 2021-10-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692522A (en) * | 2020-05-09 | 2020-09-22 | 上海工程技术大学 | Disc-shaped polishing-shaped diversion structure in gasification equipment |
| CN113536475A (en) * | 2021-06-17 | 2021-10-22 | 北京天地玛珂电液控制系统有限公司 | Flow guide disc and layout method thereof |
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| CN207546243U (en) * | 2017-11-08 | 2018-06-29 | 北京沧浪清源环保科技有限责任公司 | For the flow guiding disc of disc tube reverse osmosis (dt-ro) component |
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| US5925247A (en) * | 1995-10-02 | 1999-07-20 | Mft Membran-Filtrations-Technik Gmbh | Carrier disc and membrane cushion for filtration and separation |
| TW550556B (en) * | 2001-11-30 | 2003-09-01 | Ind Tech Res Inst | Film layer separation apparatus for disk with multi-layer film |
| US20110036767A1 (en) * | 2009-08-14 | 2011-02-17 | Chi-Chang Kuo | Water Processor |
| CN205868027U (en) * | 2016-06-08 | 2017-01-11 | 天津汇仁源环保科技有限公司 | Disc -tube type membrane post flow guide disc |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692522A (en) * | 2020-05-09 | 2020-09-22 | 上海工程技术大学 | Disc-shaped polishing-shaped diversion structure in gasification equipment |
| CN113536475A (en) * | 2021-06-17 | 2021-10-22 | 北京天地玛珂电液控制系统有限公司 | Flow guide disc and layout method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111001301B (en) | 2021-10-12 |
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