CN114790770A

CN114790770A - Guiding device in sewage inspection well

Info

Publication number: CN114790770A
Application number: CN202210446550.0A
Authority: CN
Inventors: 奚斌; 孔庆昊; 郑雅珍; 段元锋; 陈倩倩; 王贺; 陈志刚; 陈叶欣; 沈世煊
Original assignee: Yangzhou University
Current assignee: Yangzhou University
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-07-26

Abstract

The invention discloses a flow guide device in a sewage inspection well, which comprises a plurality of groups of flow guide mechanisms which are longitudinally arranged, wherein the plurality of groups of flow guide mechanisms which are longitudinally arranged are arranged in a connecting channel between a water inlet and a water outlet of the inspection well; each group of flow guide mechanism comprises two flow guide plates which are arranged oppositely; the two guide plates are arranged in parallel, and the distance between the two guide plates is consistent with the diameter of the water inlet or the water outlet; one end of a channel enclosed by the two guide plates is connected with a water inlet of the inspection well, and the other end of the channel is connected with a water outlet of the inspection well; the included angle between the guide plate and the incoming flow is 30-45 degrees; the end part of each guide plate is fixed on the inner wall of the inspection well. The flow guide device in the inspection well can effectively solve the problem of water flow steering and flow guide in the inspection well, can reduce the vortex area in the inspection well, improve the flow state of water flow in the inspection well, can prevent water flow from directly impacting the wall of the inspection well, and realizes protection of the inspection well, thereby effectively improving the overflowing capacity of the inspection well.

Description

Guiding device in sewage inspection well

Technical Field

The invention relates to a flow guide device in a sewage inspection well.

Background

And a large inspection well and a small inspection well are distributed on a sewage conveying pipeline between the sewage collecting station and the sewage treatment plant. The inspection well in the sewage conveying pipeline is usually arranged at the intersection joint of the underground sewage conveying pipelines with different pipe diameters and different pipeline gradients and at a certain interval on a long-distance straight line section, and is an important facility for conveniently inspecting and cleaning the drainage pipelines of surrounding buildings. Because the urban scale is gradually enlarged, the water demand and the water discharge are continuously increased, the sewage conveying pipe network is continuously extended and expanded, the pipeline is embedded deeply under the ground, the pipe diameter is large, meanwhile, domestic water and industrial wastewater of residents are discharged into an urban underground sewage pipeline, so that water in the sewage conveying pipeline contains a large amount of pollutants, if the cleaning is not carried out for a long time, the water flow changes the flow direction due to the blockage of impurities, so that the water flow forms a vortex area behind the sludge, simultaneously sewage conveying pipeline links to each other with the sewage inspection shaft, and when the height drop is great in the sewage inspection shaft, the inspection shaft internal water flow that easily causes sewage conveying pipeline cross connection department overflows not smoothly, forms potential harm, and the local resistance loss in the aggravation sewage inspection shaft makes the actual ability of overflowing of pipeline less than the designing requirement, and sewage pump station power consumption increases, brings economic loss in the certain degree, influences city sewage disposal system's unobstructed nature simultaneously.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a flow guide device capable of effectively improving the overflowing flow state in an inspection well, so that the overflowing capacity in the sewage inspection well meets the design requirement.

The technical scheme is as follows: the invention relates to a flow guide device in a sewage inspection well, which comprises a plurality of groups of flow guide mechanisms which are longitudinally arranged, wherein the plurality of groups of flow guide mechanisms which are longitudinally arranged are arranged in a connecting channel between a water inlet and a water outlet of the inspection well; each group of flow guide mechanism comprises two flow guide plates which are arranged oppositely; the two guide plates are arranged in parallel, and the distance between the two guide plates is consistent with the diameter of the water inlet or the water outlet; one end of a channel enclosed by the two guide plates is connected with a water inlet of the inspection well, and the other end of the channel is connected with a water outlet of the inspection well; the included angle between the guide plate and the incoming flow is 30-45 degrees; the end part of each guide plate is fixed on the inner wall of the inspection well.

Wherein, a plurality of overflow holes are arranged on the side wall of each guide plate. When water flows through the overflow holes, the curvature of the flow line, the rotation angular velocity and the stress gradient of the water flow change, and main flow (incoming flow) is separated at the boundary layer of the guide plate, so that small-sized vortexes are formed to change the front and back flow velocity distribution of the guide plate (the difference between the flow velocity of the water flow reaching the front end of the guide plate and the flow velocity of the water flow flowing through the tail end of the guide plate is small), and the main flow is effectively guided.

The flow guide mechanism also comprises a connecting beam arranged between the two flow guide plates; the connecting beam is connected with the guide plates on the two sides and is used for bearing the dead weight of the flow guide mechanism and the water pressure load on the upper part.

The width of the guide plate is not larger than the opening caliber of the top of the inspection well. The height and the width b of the guide plate are smaller than the caliber of an inspection well overhauling inlet, and the guide plate is convenient to transport into the well.

The outer side walls at two ends of each guide plate are fixedly connected with concave buckles, expansion screws are arranged at the positions, corresponding to the concave buckles, of the inner side walls of the inspection well, the expansion screws are clamped into grooves of the concave buckles, and the guide plates are buckled on the expansion screws through the groove buckles and fixed in the inspection well.

The inspection well comprises an upper breast wall arranged in the inspection well, wherein the upper breast wall is positioned on one side of a water outlet in the inspection well and is positioned above the multiple groups of flow guide mechanisms. The upper breast wall can prevent water flow from directly impacting the wall of the inspection well, and when the water level difference of the upstream pipeline and the downstream pipeline is large, the position and the size of water weight and load are improved, the stability of the wall and the base of the inspection well and the stress distribution are influenced, and the safety of the inspection well is protected.

Has the beneficial effects that: the flow guide device in the inspection well can effectively solve the problem of water flow steering and flow guide in the inspection well, can reduce a vortex region in the inspection well, improve the flow state of water flow in the inspection well, reduce head loss (small change of flow velocity in front of the flow guide plate and behind the plate), prevent water flow from directly impacting the inspection well wall, realize protection on the inspection well and effectively improve the overcurrent capacity of the inspection well; the flow rate of the pipeline is generally not less than 0.5m/s of the silt-free flow rate and not more than 3m/s of the maximum allowable flow rate, under the same inflow condition, the water flow in the inspection well without the flow guide mechanism is influenced by vortex, structure, sludge and the like, the flow rate of the water flow is greatly reduced, and the silt-free flow rate can be achieved; the flow state of water flow in the inspection well with the flow guide mechanism is good, the influence of vortex on flow velocity is effectively reduced, the head loss is small, the proportion of local head loss to on-way head loss is effectively reduced, the flow velocity of the cross section of the water flow is large, and the flow velocity of a downstream sewage pipeline reaches 2-3 m/s, so that the inspection well with the flow guide mechanism has good overflowing capacity; the flow guide device has the advantages of simple structure, convenient installation, convenient repeated and repeated utilization, wide applicability and installation of sewage pipeline joints with complicated connection, and can be disassembled at any time.

Drawings

FIG. 1 is a schematic view of an inspection well equipped with a deflector of the present invention;

FIG. 2 is a top view of the deflector;

FIG. 3 is a schematic view of the connection between the female clip and the expansion screw.

Detailed Description

As shown in fig. 1 to 3, the flow guide device in the sewage inspection well comprises a plurality of groups of flow guide mechanisms which are longitudinally arranged, wherein the plurality of groups of flow guide mechanisms which are longitudinally arranged are arranged in a connecting channel between a water inlet and a water outlet of an inspection well 2; each group of flow guide mechanism comprises two flow guide plates 9 which are arranged oppositely; the two guide plates 9 are arranged in parallel, and the distance between the two guide plates 9 is consistent with the diameter of the water inlet or the water outlet; one end of a channel enclosed by the two guide plates 9 is connected with a water inlet of the inspection well 2, and the other end of the channel is connected with a water outlet of the inspection well 2; the included angle (inclination angle) alpha between the guide plate 9 and the incoming flow is 30-45 degrees; the end part of each guide plate is fixed on the inner wall of the inspection well. The included angle alpha between the guide plate 9 and the incoming flow is the included angle between the connecting line of the end point of the top end of the guide plate and the circle center corresponding to the inspection well and the water flow direction.

Guide plate 9 presents the arc and compares and be longer in straight line template length, and the distance of guide rivers is longer, can effectively avoid rivers direct impact department wall of buckling, eliminates vortex and backward flow because of elbow bend arouses, can reduce flow resistance and rivers energy loss by a wide margin, reduces the rivers velocity of flow that reachs the guide plate front end promptly and flows through the terminal rivers velocity of flow difference of guide plate. Along with inclination alpha increase, the change of flow field flow state is big more, and the vorticity of deflector head department increases, and the backward flow district behind the board increases, and what rivers choose the flow effect is more obvious, and only the contained angle of deflector and mainstream is at 30 ~ 45, and the rivers velocity of flow influence is minimum around to the deflector (make the rivers velocity of flow that reaches the deflector front end and the terminal rivers velocity of flow through the deflector differ very little) to it is few to form the siltation behind the board. In order to ensure that the flow is influenced by the guide plate to be slightly deviated when the water flows along the main flow direction, the flow line of the flow field surface flow layer basically moves in parallel, and the condition that the water flow at the bend forms spiral flow when the water flow does curved motion is relieved, the distance Z between the guide plate 9 and the corresponding chord length is 0.15-0.25 time of the radius r in the inspection well, so that the flow state of the water flow flowing through the guide plate is good.

Each group of the flow guide mechanisms also comprises a connecting beam 10 arranged between the two flow guide plates 9; the side wall of the guide plate 9 is provided with a plurality of overflow holes 7, when water flows through the overflow holes 7, the streamline curvature, the rotation angular velocity and the stress gradient of the water flow change, and the main flow is separated at the boundary layer of the guide plate 9, so that a small vortex is formed to change the front and back flow velocity distribution of the guide plate 9, and the main flow is effectively guided to flow; all having linked firmly concave type buckle 8 on the lateral wall at every guide plate 9 both ends, 2 inside walls of inspection shaft are equipped with expansion screw 11 in the department that corresponds concave type buckle 8, and expansion screw 11 card is gone into in concave type buckle 8's recess, and guide plate 9 is fixed in inspection shaft 2 on expansion screw 11 through groove buckle 8 knot. The guide plate 9 and the wall of the inspection well 2 are connected by a buckle and an expansion screw 11, so that the installation and the disassembly are convenient. Other fastening means may be used to secure the deflector 9 in the inspection well 2.

The width of the guide plate 9 is not more than the opening caliber of the top of the inspection well 2. That is, the height (width) b of the guide plate 9 is smaller than the caliber of the inspection well inspection inlet, so that the guide plate can be conveniently transported into the well.

The flow guide device in the sewage inspection well further comprises an upper breast wall 12 arranged in the inspection well 2, wherein the upper breast wall 12 is positioned on one side of a water outlet in the inspection well 2 and is positioned above the plurality of groups of flow guide mechanisms. Go up breastwork 12 and can block the 2 wall of a well of rivers direct impact inspection shaft, improve the position and the size of water weight and load when upstream and downstream pipeline water head is great, all influential to 2 wall of a well of inspection shaft, basement stability and stress distribution, can protect 2 safety of inspection shaft, the staff detects the sediment condition and in time clears up through going into the well of maintenance cat ladder 3.

When water flows through the upper sewage pipeline 4 (enters the inspection well through the water inlet of the inspection well), the guide plate 9 guides water flow to enter the lower sewage pipeline 4 (the front-back fall h of the sewage pipeline), the overflow holes 7 discharge the water flow and reduce the vortex area, so that the flow state of the water flow is guided and improved, and meanwhile, sediment 6 brought by the sewage pipeline 4 is precipitated in the inspection well 2. The width b of the guide plate is smaller than the inner diameter of the top opening of the inspection well, and the inspection well is applicable to various complex inspection wells. At the road pavement 1, workers use the overhauling crawling ladder 3 to check the bottom of the well to investigate the sewage pipeline and the sedimentation condition in the well, operate and overhaul in time, and can disassemble the breast wall 12 so as to be convenient for installation and disassembly.

The fixed dismounting device of portable arranges in the guide plate 9 outside, does not influence rivers and siltation and passes through. The mode of dismantling buckle and expansion screw is adopted between tie-beam 10 and the guide plate 9 to be connected fixedly equally, and tie-beam 10 both ends have linked firmly concave buckle 8, and guide plate 9 inboard also is equipped with expansion screw 11, and concave buckle 8 of tie-beam 10 tip is placed on guide plate 9 inboard expansion screw 11, and the installation and the dismantlement of being convenient for also can adopt other modes of linking firmly with guide plate 9 and tie-beam 10 fixed connection. The deflector 9 and the connecting beam 10 can be directly placed on the expansion screw 11, so that the whole device is convenient to install and dismantle.

Claims

1. The utility model provides a guiding device in sewage inspection shaft which characterized in that: the device comprises a plurality of groups of flow guide mechanisms which are arranged longitudinally, wherein the plurality of groups of flow guide mechanisms which are arranged longitudinally are arranged in a connecting channel between a water inlet and a water outlet of the inspection well (2); each group of the flow guide mechanisms comprises two flow guide plates (9) which are arranged oppositely; the two guide plates (9) are arranged in parallel, and the distance between the two guide plates (9) is consistent with the diameter of a water inlet or a water outlet of the inspection well (2); one end of a channel enclosed by the two guide plates (9) is connected with a water inlet of the inspection well (2), and the other end of the channel is connected with a water outlet of the inspection well (2); the included angle between the guide plate (9) and the incoming flow is 30-45 degrees; the end part of each guide plate (9) is fixed on the inner side wall of the inspection well (2).

2. The diversion device in the sewage inspection well according to claim 1, wherein: a plurality of overflow holes (7) are formed in the side wall of each guide plate (9).

3. The diversion device in the sewage inspection well according to claim 1, wherein: the flow guide mechanism also comprises a connecting beam (10) arranged between the two flow guide plates (9); the connecting beam (10) is connected with the guide plates (9) at two sides.

4. The diversion device in the sewage inspection well according to claim 1, wherein: the width of the guide plate (9) is not more than the opening caliber of the top of the inspection well (2).

5. The diversion device in the sewage inspection well according to claim 1, wherein: all linked firmly concave type buckle (8) on the lateral wall at every guide plate (9) both ends, inspection shaft (2) inside wall is equipped with expansion screw (11) in corresponding concave type buckle (8) department, and expansion screw (11) card is gone into in the recess of concave type buckle (8), and guide plate (9) are detained through recess buckle (8) and are fixed in inspection shaft (2) on expansion screw (11).

6. The diversion device in the sewage inspection well according to claim 1, wherein: the inspection well further comprises an upper breast wall (12) arranged in the inspection well (2), wherein the upper breast wall (12) is positioned on one side of a water outlet of the inspection well (2) and above the plurality of groups of flow guide mechanisms.