CN111237297B - A fluid flow balancing unit, flow distribution module and flow balancing device - Google Patents
A fluid flow balancing unit, flow distribution module and flow balancing device Download PDFInfo
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- CN111237297B CN111237297B CN202010157426.3A CN202010157426A CN111237297B CN 111237297 B CN111237297 B CN 111237297B CN 202010157426 A CN202010157426 A CN 202010157426A CN 111237297 B CN111237297 B CN 111237297B
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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
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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
- F15D1/0005—Baffle plates
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Abstract
The invention belongs to a flow equalizing device, in particular to a fluid flow equalizing unit, a flow equalizing module and a flow equalizing device, wherein the fluid flow equalizing unit comprises two flow equalizing plates and a flow guiding plate positioned between the two flow equalizing plates, the upper part of the flow guiding plate is provided with a bulge for equalizing single fluid flow, the upper part and the side part of the flow equalizing plate are protruded out of the flow guiding plate, and the protruding part and the flow guiding plate form a guide groove for fluid to pass through.
Description
Technical Field
The invention belongs to a flow equalizing device, and particularly relates to a fluid flow equalizing unit, a flow equalizing module and a flow equalizing device.
Background
The fluid relates to the field industry, has wide application, has small particle solid 'fluid', liquid flow, gas flow and supercritical fluid, and the flow of the fluid in a certain medium is often interfered by factors such as uneven resistance distribution, viscosity, speed, elasticity and the like, so that the controllable flow equalization effect is difficult to achieve by the conventional method.
The current application of the fluid is very wide, from conventional gas flow and liquid flow to 'small particle solid flow' with similar fluid fluidity characteristics, the current fluid is difficult to achieve a very uniform effect simply or without the help of force outside gravity, and even if a certain condition is met, the uniform effect is also difficult to achieve the effect of equalizing the fluid under unsaturated flow without the help of external force. Adverse effects include ①, uneven distribution of fluid, uneven damage to the receiving device due to the difference of stress of each receiving part, ②, uneven accumulated receiving amount of each part when filling with solid particles, cone-shaped overall accumulation, uneven local thickness and density, ③, and disadvantages of low reaction yield, side reaction, and out of control reaction due to partial shortage and excessive synthesis reaction.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fluid flow equalizing unit, a flow equalizing module and a flow equalizing device which can achieve flow equalizing only by means of the gravity of fluid.
The invention discloses a fluid flow equalizing unit which comprises two flow equalizing plates and a flow guiding plate positioned between the two flow equalizing plates, wherein the upper part of the flow guiding plate is provided with a bulge for equalizing single fluid flow, the upper part and the side part of the flow equalizing plate are protruded out of the flow guiding plate, and the protrusion part and the flow guiding plate form a guide groove for passing fluid.
Further, the slopes of the two sides of the top of the bulge are consistent.
Further, the guide groove is a straight groove or a wave groove.
Further, the bottom of the guide plate is provided with a concave I.
The utility model provides a fluid flow distribution module, includes fluid flow equalization unit, and fluid flow equalization unit interconnect is fixed, forms the upper portion and is trapezoidal, and the lower part is the axisymmetric figure of the vertical direction that the triangle-shaped set up that falls, and upper portion trapezoidal is provided with a plurality of layers, and the top layer is provided with at least 2 fluid flow equalization units, and each layer is 1 more fluid flow equalization unit than last layer down, and lower part inverted triangle-shaped top layer is 1 or 3 fluid flow equalization units less than upper portion trapezoidal bottom, and each layer is 1 less fluid flow equalization unit than last layer down.
Furthermore, the horizontal direction intervals of a plurality of guide grooves positioned on the outer sides of the two waists on the lower inverted triangle are consistent.
A fluid flow equalizing device comprises fluid flow equalizing modules, wherein at least two groups of fluid flow equalizing modules are longitudinally staggered, and the symmetry axis of one group of fluid flow equalizing modules is aligned with the side edge of the fluid flow equalizing unit at the outermost side of the other group of fluid flow equalizing modules.
Furthermore, the fluid flow equalizing module is transversely provided with a plurality of groups side by side, and is longitudinally staggered with the plurality of groups.
The fluid flow equalizing device further comprises a fluid flow blocking device, wherein the fluid flow blocking device comprises a plurality of flow blocking plates arranged on the side edges of the guide grooves on the outer sides of the two waists of the inverted triangle at the lower part, the flow blocking plates block the side edges of the guide grooves on the outer sides of the two waists, and fluid is prevented from being thrown out in a parabolic mode.
The fluid flow equalizing device further comprises a fluid flow converging device, the fluid flow converging device comprises a converging plate arranged at the bottoms of the plurality of flow blocking plates, the bottoms of the plurality of flow blocking plates are flush, the converging plate extends downwards obliquely along one side of the flow blocking plate to the other side, and 2 converging plates of overlapping parts of two groups of fluid flow dividing modules arranged in a staggered mode enclose to form a converging groove.
The beneficial effects of the invention are as follows:
the fluid flow equalizing unit can equally divide single fluid, and after the fluid flow equalizing units are combined to form the fluid flow equalizing device, fluid flow equalizing can be performed, and the fluid flow equalizing device has the advantages of good effect, simple overall structure, convenience in operation and capability of achieving excellent flow equalizing effect only by gravity;
the guide groove is provided with a straight groove or a wave groove which respectively corresponds to the non-viscous fluid and the viscous fluid, so that the flow equalizing effect of the non-viscous fluid and the viscous fluid is ensured;
The concave I is arranged at the bottom of the guide plate, so that viscous fluid can be prevented from gathering or shifting in the middle when flowing from the bottom of the guide groove to the bottom of the guide plate.
The fluid flow equalizing modules are transversely provided with a plurality of groups side by side, and are longitudinally staggered and provided with a plurality of groups for combining to form a fluid flow equalizing device, so that a geometric flow equalizing area with the projection of rectangle, sector, circle and the like can be formed, the use efficiency is improved, and different flow equalizing requirements are met;
By arranging the fluid flow blocking device, fluid in the guide groove at the outer sides of the two waists of the inverted triangle at the lower part is prevented from being thrown out in a parabolic manner, and the flow equalizing effect is prevented from being influenced;
And the fluid converging device is arranged to converge the overlapped parts of the two groups of fluid flow dividing modules which are arranged in a staggered way in the front-back direction, so that the flow equalizing effect is improved.
Drawings
Fig. 1 is a schematic view of a first angle structure of a first embodiment of a fluid flow equalizing unit according to the present invention.
Fig. 2 is a schematic view of a second angle structure of the first embodiment of the fluid flow equalizing unit of the present invention.
Fig. 3 is a schematic diagram of a first embodiment of a fluid diversion module according to the present invention.
Fig. 4 is a schematic diagram of a first embodiment of a fluid diversion module according to the present invention.
Fig. 5 is a schematic diagram of a first embodiment of a fluid diversion module according to the present invention.
Fig. 6 is a schematic structural diagram of a second embodiment of the fluid flow equalizing unit of the present invention.
Fig. 7 is a combined schematic view of a second embodiment of the fluid diversion module of the present invention.
Fig. 8 is a top view of a second embodiment of a fluid diversion module of the present invention.
Fig. 9 is a perspective view of a second embodiment of a fluid diversion module of the present invention.
Fig. 10 is a schematic structural view of a plugging sheet I according to the present invention.
FIG. 11 is a schematic diagram of the path of the channels in the fluid diversion module of the present invention.
Fig. 12 is a front view of a fluid flow straightener in the present invention.
Fig. 13 is a schematic view of a fluid flow equalizer according to the present invention.
Fig. 14 is a top view of a fluid flow device according to the present invention.
Fig. 15 is a schematic structural diagram of a fluid flow equalizer according to the present invention.
Fig. 16 is a left side view of a fluid flow equalizer according to the present invention.
Fig. 17 is a schematic structural view of a flow guiding device and a converging device in the present invention.
Fig. 18 is a front view of a modified structure of the fluid diversion module according to the present invention.
Fig. 19 is a front view of a modified structure of the fluid flow equalizer of the present invention.
In the figure, a flow equalizing unit 1, a flow equalizing plate 11, a flow guiding plate 12, a protrusion 13, a guide groove 14, a concave I15, a connecting point 16, a deformation unit I1a, a deformation unit II1b, a blocking piece I2 a, a deformation blocking piece II 2b, a channel 3, a flow blocking device 4, a flow blocking plate 41, a blocking piece II 42, a flow guiding groove 43, a flow converging device 5, a flow converging plate 51, a flow converging groove 52, a flow converging hole 53 and a concave II 54.
Detailed Description
As shown in fig. 1-19, the invention comprises a fluid flow equalizing unit, which comprises two flow equalizing plates 11 and a flow guiding plate 12 positioned between the two flow equalizing plates 11, wherein a bulge 13 for equalizing single fluid flow is arranged at the upper part of the flow guiding plate 12, the upper part and the side part of the flow equalizing plate 11 are arranged protruding from the flow guiding plate 12, and the protruding part and the flow guiding plate 12 form a guide groove 14 for fluid to pass through.
In addition to the fluid flow equalizing units located on the top layer of the upper trapezoid and the two waists of the trapezoid, in the use process of the rest fluid flow equalizing units, the fluid is equally divided into two strands from a single strand through the protrusions 13 and flows to the guide grooves 14 on the two sides respectively, so that the fluid flow equalizing plates 11 can be rectangular or other shapes capable of forming the guide grooves 14 with the guide plates 12, in the embodiment, as shown in fig. 1 and 2, the fluid flow equalizing plates 11 are of hexagonal structures which are similar to the cross section of the guide plates 12 but have the characteristics of protruding tops and concave bottoms slightly larger than the guide plates 12.
In order to ensure that the fluid is equally divided from the protrusion 13 at the top of the fluid flow equalizing unit, the gradients at the two sides of the top of the protrusion 13 are identical, such as the fluid flow equalizing unit shown in fig. 1, the deformation unit I1a and the deformation unit II1b shown in fig. 18, and the angles between the left and right sides and the vertical direction are identical at the top of the protrusion 13, that is, when the fluid stays from the guide groove 14 at the last position to the top of the protrusion 13, the same gradient makes the fluid equally divided to the guide grooves 14 at the two sides.
As shown in fig. 1-5, for non-viscous fluid, the guide groove 14 is a straight groove, the guide grooves 14 of the 2 fluid flow equalizing units connected in parallel form a square channel 3 as shown in fig. 4, the channel 3 can enable the fluid to vertically downwards, and can be widely applied to gas, liquid, solid particles with good fluidity and the like with density higher than that of the environment gas, as shown in fig. 6-8, for viscous fluid, the guide grooves 14 can adopt wave grooves, the guide grooves 14 of the 2 fluid flow equalizing units connected in parallel form a channel 3 (sine curve and cosine curve) of a wave line as shown in fig. 8, and the channel 3 can guide viscous fluid to flow to the center of a protrusion 13 of the lower fluid flow equalizing unit, so that the flow equalizing effect (the high viscosity has poor fluidity per se, and generally needs relatively longer time and speed limit/limit quantity) is ensured by adopting the device.
The bottom of the guide plate 12 is provided with a concave I15, the concave I15 enables two sides of the bottom of the guide plate 12 to be thin slices, an acute angle is formed in the front view of the thin slices, an included angle is formed between the thin slices and the horizontal direction, the two angles are complementary angles, when viscous fluid flows to the bottom of the guide plate 12 along the guide groove 14, the viscous fluid is prevented from gathering or shifting in the middle of the bottom of the guide plate 12, and meanwhile materials are saved.
The invention also provides a fluid flow distribution module, which comprises fluid flow distribution units, wherein the fluid flow distribution units are mutually connected and fixed to form an axisymmetric graph with an inverted triangle upper part and an inverted triangle lower part in the vertical direction, the upper trapezoid upper part is provided with a plurality of layers, the top layer is provided with at least 2 fluid flow distribution units, each layer is 1 fluid flow distribution unit more than the previous layer, the lower inverted triangle top layer is 1 or 3 fluid flow distribution units less than the upper trapezoid bottom layer, each layer is 1 fluid flow distribution unit less than the previous layer, as shown in fig. 5, 9, 11 and 18, the whole of the fluid flow distribution module is plate-shaped, the fluid flow distribution units of each row are sequentially connected and fixed left and right, each upper trapezoid is sequentially increased by 1 fluid flow distribution unit, each lower inverted triangle is sequentially decreased by 1 fluid unit, the fluid flow distribution module is formed by assembling the fluid flow distribution units, the guide grooves 14 of the 2 fluid flow distribution units are matched to form a channel 3, the fluid flow distribution channel path shown by a black thick solid line in fig. 11 and 18, the fluid flow distribution module enters the channel 14 from the middle of the top 2 fluid flow distribution units and finally flows out of the fluid flow distribution module through the channel 14 (the fluid flow distribution channel is shown by the broken line).
In order to ensure that when the fluid is equalized, the fluid flowing down from the two guide grooves 14 in the middle of one group of fluid diversion modules is consistent with the fluid flowing down from the guide grooves on the side edges of the other group of fluid diversion modules which are longitudinally staggered, and the horizontal direction intervals of a plurality of guide grooves 14 positioned on the outer sides of the two waists on the lower inverted triangle are consistent, so that when the flow equalization device is used, the complete equal division is realized, and the flow equalization device is applied to a flow equalization device with high requirements.
Specifically, as shown in fig. 18 and 19, in this embodiment, the lower inverted triangle top layer is fewer than the upper trapezoid bottom layer by 1 fluid flow equalizing unit, taking the total layer number as 10 layers as an example, the middle 2 cases of the fluid flow equalizing module are respectively a deforming unit I1a and a deforming unit II1b, the deforming unit I1a is symmetrically arranged in left and right, the deforming unit II1b is 1, the deforming unit I1a and the deforming unit II1b are distributed at intervals up and down, the height direction dimensions of the fluid flow equalizing unit 1, the deforming unit I1a and the deforming unit II1b are consistent, the width direction dimension ratio is 4:3:2, as shown in fig. 18, the fluid flows out of the horizontal direction along 10 guide grooves 14 positioned at the outer sides of the inverted triangle, and has consistent intervals in the width direction, as shown in fig. 19, when finally assembled into the fluid flow equalizing device, the complete equal division can be realized, in this embodiment, considering that the depth of the side edges of the guide grooves 14 affects the whole spacing dimension to a certain extent, and the width of the deforming unit I1a plus 0.5X of the deforming unit II and the width X of the deforming unit II1b is added under the condition that the width of the side edges of the guide grooves 14 is X.
A fluid flow equalizing device comprises fluid flow equalizing modules, wherein at least two groups of fluid flow equalizing modules are longitudinally staggered, and the symmetry axis of one group of fluid flow equalizing modules is aligned with the side edge of the fluid flow equalizing unit at the outermost side of the other group of fluid flow equalizing modules.
The distribution probability distribution of a distribution module when the distribution module is respectively 6 layers to 18 layers is obtained according to the calculation as follows:
TABLE 1
In this embodiment, taking a fluid flow splitting module with 3 fluid flow splitting units on the top layer of the lower inverted triangle as an example, which is 12 layers of the fluid flow splitting module as a whole, as shown in fig. 11, fluid entering the fluid flow splitting module from the middle of the top 2 fluid flow splitting units flows through the channels 3 on the left and right sides of the bottom layer of the upper trapezoid and the inside of the fluid flow splitting unit of the lower inverted triangle, and finally flows out by splitting through 12 guide grooves 14 on the outer sides of two waists of the lower inverted triangle (thick solid lines are paths of fluid flowing in the fluid flow splitting module and broken lines are paths of fluid flowing out of the fluid flow splitting module in the illustration), and has a distribution rule as shown in table 1:
0.015625/0.052734/0.082031/0.109375/0.123047/0.123047/0.123047/0.123047/0.123047/0.109375/0.082031/0.052734, The characteristics are that two sides are less, middle is more and more vertical direction axisymmetric probability distribution, when at least two groups of longitudinally staggered fluid diversion modules form a fluid flow equalizing device, namely as shown in fig. 12-16 and 19, the superposition part of the two groups of fluid diversion modules is the probability distribution shown in the following table:
TABLE 2
In this embodiment, since the middle two columns of each group of fluid flow splitting modules cannot overlap with the edges of the other group of fluid flow splitting modules matched with the middle two columns of each group of fluid flow splitting modules to form the fluid flow equalizing device, taking the overall 12-layer fluid flow splitting module with 3 fluid flow equalizing units on the upper inverted triangle top layer as an example, when 2 groups of fluid flow equalizing modules overlap, the probability of fluid distribution at the overlapping part is (including the fluid flowing down from the guide groove 14 near the overlapping region side of the last fluid flow equalizing unit at the bottom of the inverted triangle in a single fluid flow splitting module, for example, the fluid flowing down from the broken line part of a and g in fig. 12):
0.123047/0.138672/0.162109/0.164062/0.162109/0.138672/0.123047。
the more the number of the whole layers of the fluid flow dividing module is, the better the flow dividing effect of the fluid flow dividing device is, only the structure and the effect are considered, and 18 layers are preferably adopted, wherein the flow dividing effect of the fluid flow dividing device is 0.098190308/0.100143/0.100433/0.100525/0.100708/0.100708/0.100525/0.100433/0.100143/0.098190308, and the equal proportion approaches the same.
In order to improve the flow equalizing effect and the disposable flow equalizing capacity, as shown in fig. 14, the fluid flow equalizing modules are transversely arranged in parallel, longitudinally staggered in a plurality of groups, and the fluid flow equalizing modules in a plurality of groups are transversely arranged in parallel, that is, the fluid flow equalizing units on two sides of the upper trapezoid bottom layer are mutually connected in parallel, and the fluid flow equalizing modules in a plurality of longitudinal columns are staggered in a plurality of groups. In the fluid flow dividing module shown in fig. 18, because the horizontal direction intervals of the plurality of guide grooves positioned on the outer sides of the two waists on the lower inverted triangle are kept consistent when the fluid flow dividing device is formed, when the plurality of fluid flow dividing modules are arranged transversely, the width of the fluid flow dividing unit 1 needs to be added in half at the lowest layer of the upper trapezoid structure.
Specifically, 6 connection points 16 are provided on two sides of the top and bottom of the flow equalizing plate 11 of the fluid flow equalizing module, the whole flow equalizing plate 11 is fixedly connected with each other through 6 connection points (since 2 flow equalizing plates 11 are symmetrically provided, each flow equalizing plate 11 has 3 connection points), wherein, except for the fluid flow equalizing units on two sides of the inverted triangle on the top and the bottom, 2 connection points 16 on two sides of the bottom of the rest fluid flow equalizing units are respectively connected with the top connection points 16 of two fluid flow equalizing units on the next layer, wherein, in order to prevent dust and fluid from entering and exiting, a gap shown in fig. 3 exists between the flow equalizing plates 11, in this embodiment, a plugging piece I2 overlapped with the gap is designed, as shown in fig. 18, the gap formed by the deformation unit I1a and the deformation unit II2b is plugged by the deformation plugging piece I2a, and the deformation unit II2b, and all flow equalizing plates 11 of the fluid flow equalizing module can be of course integrally formed, and only the flow equalizing plates 12 with protrusions 13 and concave I15 are arranged between two flow equalizing plates 11 in the middle vertical directions of the inverted triangle on the upper and lower sides.
As shown in fig. 15-19, in order to prevent the fluid from flowing out of the guide groove 14 at the outer sides of the two waists of the lower inverted triangle from being affected by gravity to form parabolic flow and affecting the flow equalizing effect, the invention further comprises a fluid flow blocking device, wherein the fluid flow blocking device comprises a plurality of flow blocking plates 41 arranged on the side edges of the guide groove 14 at the outer sides of the two waists of the lower inverted triangle, the flow blocking plates 41 block the side edges of the guide groove 14 at the outer sides of the two waists to prevent the fluid from being thrown out in parabolic form, and ensure the flow equalizing effect, in the embodiment, the top of the flow blocking plates 41 is also provided with blocking pieces II42 which are attached to the gaps at the outer sides of the two waists of the lower inverted triangle, so that the connection and the fixation are facilitated, and the gaps of the fluid flow equalizing unit at one side of the two waists of the lower inverted triangle are blocked to prevent dust and fluid from entering and exiting.
In order to ensure that the fluid in the overlapping area of the fluid flow equalizing device is converged and improve the flow equalizing effect, the invention further comprises a fluid flow converging device, wherein the fluid flow converging device comprises a converging plate 51 arranged at the bottom of a plurality of flow blocking plates 41, in the embodiment, the bottoms of the plurality of flow blocking plates 41 are flush, the converging plate 51 extends downwards obliquely along one side of the flow blocking plates 41 to the other side, 2 converging plates 51 of overlapping parts of two staggered fluid flow dividing modules enclose to form a converging groove 52, in particular, as shown in fig. 17, the fluid flow blocking device and the fluid flow converging device can be integrally formed, in the embodiment, the width of the flow blocking plate 41 is half the width of the fluid flow equalizing unit (in order to ensure the integrity of the fluid flow equalizing device after assembly, the widths of the flow blocking plates 41 positioned in the middle and at two sides of an inverted triangle are slightly wider), the flow baffle 41 is provided with a flow guide groove 43 for communicating another channel 3 at one side of the flow baffle 41 away from the blocked guide groove 14, after a plurality of flow baffles 41 are combined, the lower part is inverted into a rectangle in a triangular shape, fluid at two sides of the overlapped part of the fluid flow equalizing module is collected at one side through the bus plate 51, so that the flow equalizing effect is greatly improved, in the embodiment, as shown in fig. 17, the bus plate 51 is integrally arranged with the bottoms of a plurality of flow baffles 41, the flow guide grooves 43 are formed in the flow guide grooves, the flow guide grooves 43 are formed in the flow guide plates, the flow guide grooves 43 are communicated with the flow guide grooves 53, the concave II54 is arranged between the two flow guide grooves 53, viscous fluid is prevented from gathering or shifting from the bottom of the flow guide grooves 53 to the middle of the bottom of the flow guide plates 51, and the flow guide grooves are formed in the bottom of the flow guide grooves, wherein broken lines at the bottom indicate the flow direction of the fluid in the flow guide grooves 53, and the concave II54 for preventing the fluid from gathering towards the flow guide plates 51 is arranged at the bottom of the flow guide grooves.
Claims (7)
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| CN211715464U (en) * | 2020-03-09 | 2020-10-20 | 三金集团湖南三金制药有限责任公司 | Fluid flow equalizing unit, flow dividing module and flow equalizing device |
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| GB597871A (en) * | 1942-08-22 | 1948-02-05 | Victor Rakowsky | Improvements in gravity separation of materials |
| US3995753A (en) * | 1975-07-31 | 1976-12-07 | Uop Inc. | Dispensing apparatus for particulate matter |
| JPH0737865B2 (en) * | 1989-06-28 | 1995-04-26 | 松下電器産業株式会社 | Shunt |
| CA2825012C (en) * | 2011-01-19 | 2021-03-23 | President And Fellows Of Harvard College | Slippery liquid-infused porous surfaces and biological applications thereof |
| US9630154B2 (en) * | 2011-08-10 | 2017-04-25 | Albert Van Duijn | Apparatus and method for contacting a gas and a liquid |
| WO2014049824A1 (en) * | 2012-09-28 | 2014-04-03 | 株式会社薬膳壷焼本舗五行 | Liquid or powder falling distribution device |
| CN205818405U (en) * | 2016-06-15 | 2016-12-21 | 浙江驰讯管业有限公司 | A kind of umbellate form flow dividing structure |
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| CN104652350A (en) * | 2015-01-04 | 2015-05-27 | 河海大学 | Open channel diffusion section flow-equalizing device and method for calculating placement position of open channel diffusion section flow-equalizing device |
| CN204709979U (en) * | 2015-06-10 | 2015-10-21 | 周小参 | Current-sharing retains filter and application thereof |
| CN211715464U (en) * | 2020-03-09 | 2020-10-20 | 三金集团湖南三金制药有限责任公司 | Fluid flow equalizing unit, flow dividing module and flow equalizing device |
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