CN114790770A - Guiding device in sewage inspection well - Google Patents

Abstract

The invention discloses a diversion device in a sewage inspection well, which comprises a plurality of sets of diversion mechanisms arranged in the longitudinal direction, and the plurality of sets of diversion mechanisms arranged in the longitudinal direction are arranged in the connection passage between the water inlet and the water outlet of the inspection well ;Each group of guide mechanism includes two oppositely arranged guide plates; 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 outlet; the channel enclosed by the two guide plates One end is connected to the water inlet of the inspection well, and the other end of the channel is connected to the water outlet of the inspection well; the angle between the deflector and the incoming flow is 30-45°; the end of each deflector is fixed on the inner side wall of the inspection well. The diversion device in the inspection well of the present invention can effectively solve the problem of diversion and diversion of the water flow inside the inspection well, which can not only reduce the vortex area in the inspection well, improve the flow state of the water flow in the well, but also prevent the water flow from directly impacting the inspection well wall, so as to realize the control of the inspection well. Therefore, the overcurrent capacity of the inspection well can be effectively improved.

Description

A diversion device in a sewage inspection well

technical field

The invention relates to a diversion device in a sewage inspection well.

Background technique

There are large and small inspection wells distributed on the sewage transmission pipeline between the sewage collection station and the sewage treatment plant. Inspection wells in sewage pipelines are often set at the intersections and connections of underground sewage pipelines with different pipe diameters and pipeline gradients, as well as at certain intervals on long-distance straight sections. Due to the increasing scale of the city, the water demand and drainage volume are increasing, and the sewage transportation pipeline network is continuously extended and expanded. The pipelines are buried deep underground and have large diameters. At the same time, residential water and industrial wastewater are discharged into the urban underground sewage pipelines, resulting in sewage. The water in the pipeline contains a lot of pollutants. If it is not cleaned for a long time, the water flow will be blocked by impurities and change its flow direction, resulting in the formation of a vortex area behind the sediment. At the same time, the sewage pipeline is connected to the sewage inspection well, and the height difference in the sewage inspection well is relatively high. When it is large, it is easy to cause poor water flow in the inspection wells at the staggered joints of the sewage pipelines, causing potential hazards, aggravating the local resistance loss in the sewage inspection wells, making the actual flow capacity of the pipelines less than the design requirements, and increasing the energy consumption of sewage pumping stations. It will bring economic losses to a certain extent, and at the same time affect the smoothness of the urban sewage system.

SUMMARY OF THE INVENTION

Purpose of the invention: The purpose of the present invention is to provide a diversion device that can effectively improve the over-current flow state in the inspection well, so that the over-flow capability in the sewage inspection well can meet the design requirements.

Technical scheme: The diversion device in the sewage inspection well according to the present invention includes multiple sets of diversion mechanisms arranged in the longitudinal direction, and multiple sets of diversion mechanisms arranged in the longitudinal direction are arranged at the connection between the water inlet and the water outlet of the inspection well In the channel; each group of guide mechanisms includes two oppositely arranged guide plates; 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 outlet; the two guide plates are enclosed One end of the channel is connected to the water inlet of the inspection well, and the other end of the channel is connected to the water outlet of the inspection well; the angle between the deflector and the incoming flow is 30-45°; the end of each deflector is fixed on the inner side wall of the inspection well .

Wherein, a plurality of overflow holes are opened on the side wall of each of the guide plates. When the water flows through the overflow hole, its streamline curvature, rotational angular velocity and stress gradient change, and the main flow (incoming flow) is separated at the boundary layer of the deflector, thereby forming a small vortex to change the flow velocity distribution before and after the deflector (so that it reaches the deflector). The flow velocity of the water flow at the front end of the flow plate is not much different from the flow velocity of the water flow through the end of the deflector), so as to effectively guide the main flow.

Wherein, the diversion mechanism also includes a connecting beam arranged between the two diversion plates; the connecting beam connects the two sides of the diversion plates, and the connecting beam is used to bear the self-weight of the diversion mechanism and the upper water pressure load.

Wherein, the width of the deflector is not larger than the opening diameter of the top of the inspection well. That is, the height and width b of the deflector plate can be smaller than the diameter of the inspection entrance of the inspection well, which is convenient for transportation into the well.

Among them, concave buckles are fixed on the outer side walls of both ends of each deflector, and expansion screws are arranged at the corresponding concave buckles on the inner sidewall of the inspection well, and the expansion screws are inserted into the grooves of the concave buckles. It is fastened to the expansion screw through the groove snap and fixed in the inspection well.

Wherein, it also includes an upper breast wall arranged in the inspection well, and the upper breast wall is located on one side of the water outlet in the inspection well and above the multiple groups of diversion mechanisms. The upper breast wall can prevent the water flow from directly impacting the well wall of the inspection well. When the water level difference between the upstream and downstream pipelines is large, the position and size of the water weight and load can be improved, which will affect the stability of the well wall, the base and the stress distribution of the inspection well, and protect the safety of the inspection well. .

Beneficial effect: The diversion device in the inspection well of the present invention can effectively solve the problem of water flow diversion in the inspection well, which can not only reduce the vortex area in the inspection well, improve the flow state of the water flow in the well, and make the loss of water head small (before the guide plate and after the plate). Small change in flow rate), it can also prevent the water flow from directly impacting the inspection well wall, realizing the protection of the inspection well, thereby effectively improving the flow capacity of the inspection well; the flow rate of the pipeline is generally not less than the non-silting flow rate of 0.5m/s, not greater than the maximum allowable flow rate 3m/s, under the same flow conditions, the water flow in the inspection well without the diversion mechanism is affected by the vortex, structure, silt, etc., the water flow velocity is greatly reduced, and it may reach the non-silt flow velocity; the water flow in the inspection well with the diversion mechanism Good state, effectively reduce the influence of vortex on the flow rate, the head loss is small, the proportion of local head loss to the head loss along the route is effectively reduced, and the flow velocity of the water flow section is large, so that the flow velocity of the downstream sewage pipeline reaches 2-3m/s, which indicates that there is a conductive The inspection well of the flow mechanism has good flow capacity; the diversion device of the present invention has a simple structure, is convenient to install, can be disassembled at any time, is convenient for repeated use, and has wide applicability, and can be installed at the joints of sewage pipelines with complex connections.

Description of drawings

Fig. 1 is the structural schematic diagram of the inspection well installed with the diversion device of the present invention;

Figure 2 is a top view of the flow guiding device;

FIG. 3 is a schematic diagram of the connection between the concave buckle and the expansion screw.

Detailed ways

As shown in Figures 1 to 3, the diversion device in the sewage inspection well of the present invention includes multiple sets of diversion mechanisms arranged in the longitudinal direction, and multiple sets of diversion mechanisms arranged in the longitudinal direction are arranged between the water inlet and the water outlet of the inspection well 2. Each group of guide mechanisms includes two oppositely arranged guide plates 9; 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 outlet; One end of the channel enclosed by the guide plates 9 is connected to the water inlet of the inspection well 2, and the other end of the channel is connected to the water outlet of the inspection well 2; the included angle (inclined angle) α between the guide plate 9 and the incoming flow is 30 to 45°; The end of each deflector is fixed on the inner side wall of the inspection well. The included angle α between the deflector 9 and the incoming flow is the included angle between the line connecting the top end point of the deflector and the center of the circle corresponding to the inspection well and the direction of the water flow.

Compared with the straight plate, the baffle 9 presents an arc shape with a longer length and a longer distance to guide the water flow, which can effectively prevent the water flow from directly impacting the wall of the bend, eliminate eddy currents and backflow caused by right-angle elbows, and can greatly reduce the flow of water. Small flow resistance and water flow energy loss, that is, reducing the difference between the flow velocity of the water flow reaching the front end of the deflector and the flow velocity of the water flowing through the end of the deflector. As the inclination angle α increases, the change of the flow state of the flow field is larger, the vorticity at the head of the deflector increases, the backflow area behind the plate increases, and the effect of the water flow is more obvious. Only the clip between the deflector and the mainstream The angle is 30-45°, which has the least influence on the flow velocity of the water flow before and after the deflector (the difference between the flow velocity of the water flow reaching the front end of the deflector and the flow velocity of the water flowing through the end of the deflector is small), and the formation of siltation behind the deflector is less. In addition, in order to ensure that the water flow is affected by the deflector and the deflection is small when it flows in the direction of the main flow, the flow line of the flow surface is basically parallel to the flow line, so as to reduce the situation that the curved water flow forms a spiral flow when it moves in a curved direction. The deflector 9 corresponds to it. The distance Z of the chord length is 0.15 to 0.25 times the inner radius r of the inspection well, so that the flow of water flowing through the deflector is good.

Each group of guide mechanisms also includes a connecting beam 10 arranged between two guide plates 9; a plurality of overflow holes 7 are opened on the side walls of the guide plates 9, and when the water flows through the overflow holes 7, the flow line The curvature, rotational angular velocity and stress gradient change, and the main flow is separated at the boundary layer of the deflector 9, thereby forming a small vortex to change the flow velocity distribution before and after the deflector 9, and effectively guide the main flow through the flow; the outer walls at both ends of each deflector 9 A concave buckle 8 is fixedly connected to the upper part. The inner side wall of the inspection well 2 is provided with an expansion screw 11 at the corresponding concave buckle 8. The buckle 8 is fastened on the expansion screw 11 and fixed in the inspection well 2 . The connection between the deflector 9 and the well wall of the inspection well 2 adopts the connection method of the buckle and the expansion screw 11, which is convenient for installation and disassembly. The deflector 9 can be fixed in the inspection well 2 by other fixing methods.

The width of the deflector 9 is not larger than the opening diameter of the top of the inspection well 2 . That is, the height (width) b of the deflector 9 can be smaller than the diameter of the inspection entrance of the inspection well, which is convenient for transportation into the well.

The diversion device in the sewage inspection well of the present invention further comprises an upper breast wall 12 arranged in the inspection well 2, and the upper breast wall 12 is located on one side of the water outlet in the inspection well 2 and above the multiple sets of diversion mechanisms. The upper breast wall 12 can block the water flow from directly impacting the well wall of the inspection well 2. When the water level difference between the upstream and downstream pipelines is large, the water weight and the position and size of the load can be improved, which will affect the well wall of the inspection well 2, the stability of the base and the stress distribution. To protect the safety of the inspection well 2, the staff goes down through the maintenance ladder 3 to detect the sludge and clean it up in time.

When the upper sewage pipe 4 passes water (enters the inspection well through the water inlet of the inspection well), the deflector 9 guides the water flow into the lower sewage pipeline 4 (the drop h between the front and rear of the sewage pipeline), and the overflow hole 7 discharges the water flow and reduces the vortex. In order to guide and improve the flow state of the water, at the same time, the sludge 6 brought by the sewage pipeline 4 is deposited in the inspection well 2 . The width b of the deflector is smaller than the inner diameter of the opening at the top of the inspection well, which can be applied to inspection wells in various complex situations. On the road surface 1, the staff uses the maintenance ladder 3 to check the bottom of the well to investigate the sewage pipeline and the sedimentation in the well, and operate and repair in time. The detachable breast wall 12 is easy to install and remove.

The convenient fixing and dismantling device is arranged on the outside of the deflector 9 and does not affect the passage of water flow and sludge. The connecting beam 10 and the deflector 9 are also connected and fixed by means of detachable buckles and expansion screws. The two ends of the connecting beam 10 are fixed with concave buckles 8, and the inner side of the deflector 9 is also provided with expansion screws 11. The concave buckle 8 at the end of the beam 10 is placed on the expansion screw 11 inside the deflector 9, which is convenient for installation and disassembly. Both the deflector 9 and the connecting beam 10 can be directly placed on the expansion screw 11, so that the whole device is easy to install and remove.

Claims (6)

1. A diversion device in a sewage inspection well, characterized in that: comprising multiple groups of diversion mechanisms arranged in the longitudinal direction, and multiple groups of diversion mechanisms arranged in the longitudinal direction are arranged between the water inlet and the water outlet of the inspection well (2). In the connecting channel between the two guide plates; each group of guide mechanisms includes two oppositely arranged guide plates (9); the two guide plates (9) are arranged in parallel, and the distance between the two guide plates (9) is the same as the inspection well (2). ) The diameter of the water inlet or outlet is the same; one end of the channel enclosed by the two deflectors (9) is connected to the water inlet of the inspection well (2), and the other end of the channel is connected to the water outlet of the inspection well (2); the deflector ( 9) The included angle with the incoming flow is 30-45°; the end of each deflector (9) is fixed on the inner side wall of the inspection well (2). 2 . The diversion device in a sewage inspection well according to claim 1 , wherein a plurality of overflow holes ( 7 ) are opened on the side wall of each of the diversion plates ( 9 ). 3 . 3. The diversion device in a sewage inspection well according to claim 1, characterized in that: the diversion mechanism further comprises a connecting beam (10) arranged between the two guide plates (9); the connecting beam (10) ) to connect the deflectors (9) on both sides. 4 . The diversion device in a sewage inspection well according to claim 1 , wherein the width of the diversion plate ( 9 ) is not larger than the opening diameter of the top of the inspection well ( 2 ). 5 . 5. The diversion device in a sewage inspection well according to claim 1, characterized in that: concave buckles (8) are fixedly connected to the outer side walls of both ends of each deflector (9), and the inner side of the inspection well (2) The wall is provided with expansion screws (11) corresponding to the concave buckles (8), the expansion screws (11) are inserted into the grooves of the concave buckles (8), and the guide plate (9) is buckled (8) through the grooves. Fasten it on the expansion screw (11) and fix it in the inspection well (2). 6. The diversion device in a sewage inspection well according to claim 1, characterized in that it further comprises an upper breast wall (12) arranged in the inspection well (2), and the upper breast wall (12) is located at the water outlet of the inspection well (2) one side, and is located above the multiple groups of guide mechanisms.

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