CN203977556U - Negative pressure suction type increases row's catch basin cover automatically - Google Patents

Abstract

The utility model discloses a kind of negative pressure suction type and automatically increase row's catch basin cover, comprise the inlet opening on catch basin cover and catch basin cover, bottom, inlet opening is provided with negative pressure and generates frame, and doubly, edge, inlet opening is right angle for the height of negative pressure generation bezel, cluster and the 3-4 that inlet opening degree of depth sum is inlet opening width.The utility model can form water inlet ozzle influent stream automatically according to surface gathered water amount and in catch-basin cover plate place influent stream situation, and negative pressure suction type increases surface drainage.

Description

Negative pressure suction type automatic increase drainage rainwater manhole cover

technical field

The utility model relates to a rainwater well cover, in particular to a negative pressure suction type automatic drainage increase rainwater well cover, which belongs to the technical field of urban road surface drainage.

Background technique

At present, the drainage of urban road surface is mostly through the cover plate of rainwater well as shown in Figure 1, 2 and 3, and the rainwater on the road surface is discharged into the urban drainage pipe network through the water inlet hole. The rainwater manhole cover with this structure often suffers from poor drainage, and sometimes the cover plate needs to be manually opened for medium and small-intensity rainfall. This increases the workload of the workers and causes traffic accidents and other inconveniences, such as maintenance and care. . For this reason, many methods have been adopted in the project to increase the discharge of accumulated water: first, increase the aperture of the water inlet hole, and increase the displacement by enlarging the inflow area. This will bring road garbage entry and traffic safety problems; second, increase the distribution density on the inlet holes of the rainwater manhole cover and increase the drainage. The effect is not good when the total area of the manhole cover is constant, and the structural strength of the cover body will decrease at the same time; third, by reducing the thickness of the rainwater cover, the contact area between the accumulated water flow and the rainwater manhole cover is reduced, and the accumulation of water flow on the rainwater manhole cover is shortened. residence time, thereby increasing the displacement. The structural strength of the cover body will decrease, causing road safety problems. But adopt the rainwater manhole cover of above-mentioned structure, the road area water increase drainage effect is unsatisfactory. Therefore, need a kind of new rainwater manhole cover.

Utility model content

The purpose of this utility model is to provide a negative pressure suction type automatic increase drainage rainwater well cover. According to the inflow situation, the inflow of the nozzle at the water inlet is automatically formed to increase the drainage of the road surface.

The purpose of this utility model is achieved through the following technical solutions. The negative pressure suction type automatic increase and discharge rainwater well cover includes the rainwater well cover and the water inlet hole on the rainwater well cover. The bottom of the water inlet hole is provided with a negative pressure generating frame, and a negative pressure generating frame The sum of the height of the water inlet and the depth of the water inlet is 3-4 times the width of the water inlet, and the edge of the water inlet of the water inlet is at right angles.

A method for increasing the drainage of rainwater by the above-mentioned negative pressure suction type automatic rainwater manhole cover increase and discharge, comprising discharging road accumulated water through the water inlet hole on the rainwater manhole cover, increasing the depth of the water inlet hole of the rainwater manhole cover to 3-4 times the width of the water inlet hole times, when the rainwater manhole cover is submerged by stagnant water, the stagnant water flows out through the water inlet hole to form a nozzle, and the stagnant water forms a shrinkage section in the water inlet hole, and the edge of the water inlet hole at the shrinkage section forms a negative pressure zone, and the negative pressure zone The generated vacuum automatically increases the drainage of the water inlet; by right-angled the edge of the water inlet, the vacuum degree in the negative pressure area is increased, and the drainage of the road surface is further increased.

Further, increasing the depth of the water inlet hole of the rainwater manhole cover to 3-4 times the width of the water inlet hole is realized by setting a negative pressure generating frame at the bottom of the water inlet hole.

Compared with the prior art, the utility model has the following beneficial effects:

First, because a small hole is opened on the side wall of the container containing the liquid, the liquid particles flow to the orifice from all directions under the action of a certain water head, and flow out in a jet state. Due to the inertia of the water flow, after flowing through the orifice , the cross-section shrinks, reaching the minimum value at d/2 from the orifice, and the streamlines tend to be parallel, forming a shrinking cross-section. If a short tube of L=(3-4)d is installed on the orifice, the outflow phenomenon of the water flow at this time is just the outflow of the nozzle. When the liquid flow passes through the nozzle, the liquid flow still shrinks at the nozzle inlet, so that the flow velocity of the contraction section is greater than the outlet flow velocity. Therefore, the dynamic water pressure at the shrinking section of the nozzle must be lower than the atmospheric pressure, forming a vacuum (negative pressure) in the nozzle, and its vacuum degree is about p _v =0.75H ₀ , the existence of the vacuum degree is equivalent to increasing the nozzle's pressure. Acting head. Under the same effective water head, the flow capacity of the nozzle with the same section is 1.32 times that of the orifice. Therefore, the utility model uses the hydraulic nozzle outflow principle to design the new structure of the rainwater well cover, which can automatically form the nozzle inflow at the water inlet according to the water volume of the road area and the inflow situation at the rainwater well cover, and the negative pressure suction type Increase pavement drainage.

Second, the utility model makes the maintenance of rainwater well drainage convenient during the rainy season; the supporting device is simple and can be used on existing rainwater wells, and there is no need to modify the rainwater wells, which greatly facilitates the use and promotion of the utility model.

Description of drawings

Fig. 1 is the structural representation of existing rainwater well cover;

Fig. 2 is the sectional structure diagram of A-A direction in Fig. 1;

Fig. 3 is the sectional structure schematic diagram of B-B direction in Fig. 1;

Fig. 4 is a structural schematic diagram of the utility model negative pressure suction type automatic drainage increase rainwater well cover;

Fig. 5 is a schematic cross-sectional structural view of A-A direction in Fig. 4;

Fig. 6 is the sectional structure diagram of B-B direction in Fig. 4;

In the figure: 1—Rainwater manhole cover; 2—Water inlet hole; 3—Water accumulated on the rainwater well cover plate; 4—Rainwater discharged from the water inlet hole; 5—Negative pressure area; 6—Negative pressure generating frame.

Detailed ways

As shown in Figures 4, 5, and 6, a negative pressure suction type automatic drainage increase rainwater well cover includes a rainwater well cover 1 and a water inlet hole 2 of the rainwater well cover. The bottom of the water inlet hole is provided with a negative pressure generating frame 6. The sum of the height of the frame and the depth of the water inlet hole is 3-4 times of the width of the water inlet hole, and the edge of the water inlet of the water inlet hole is at right angles.

A method for increasing the drainage of rainwater by using a negative pressure suction-type automatic rainwater manhole cover, which includes draining road accumulated water through the water inlet hole on the rainwater manhole cover, and increasing the depth of the water inlet hole of the rainwater manhole cover to 3-4 times the width of the water inlet hole. times, when the rainwater manhole cover is submerged by stagnant water, the stagnant water flows out through the water inlet hole to form a nozzle, and the stagnant water forms a shrinkage section in the water inlet hole, and the edge of the water inlet hole at the shrinkage section forms a negative pressure zone, and the negative pressure zone The generated vacuum automatically increases the drainage of the water inlet; by right-angled the edge of the water inlet of the water inlet, the vacuum degree in the negative pressure area is increased, and the drainage of the road surface is further increased.

Due to the negative pressure at the bottom of the water inlet hole, the sum of the height of the frame 6 and the depth of the water inlet hole is 3-4 times the width of the water inlet hole. The outlet of the nozzle is formed through the water inlet hole, and the accumulated water forms a shrinkage section in the water inlet hole, and the edge of the water inlet hole at the shrinkage section forms a negative pressure zone 5, and the vacuum generated by the negative pressure zone automatically increases the rainwater discharged from the water inlet hole 4. Displacement; by right-angled the edge of the water inlet of the water inlet, increasing the vacuum degree of the negative pressure area, and further increasing the drainage of the road surface; when the road area decreases and the water inlet flows freely, the negative pressure area disappears and an orifice is formed Inflow.

Because a small hole is opened on the side wall of the container containing the liquid, the liquid particles flow to the orifice from all directions under the action of a certain water head, and flow out in a jet state. Due to the inertia of the water flow, after flowing through the orifice, the cross section occurs The shrinkage phenomenon reaches the minimum value at d/2 from the orifice, and the streamlines tend to be parallel, forming a shrinkage section. If a short tube of L=(3-4)d is installed on the orifice, the outflow phenomenon of the water flow at this time is just the outflow of the nozzle. When the liquid flow passes through the nozzle, the liquid flow still shrinks at the nozzle inlet, so that the flow velocity of the contraction section is greater than the outlet flow velocity. Therefore, the dynamic water pressure at the shrinking section of the nozzle must be lower than the atmospheric pressure, forming a vacuum (negative pressure) in the nozzle, and its vacuum degree is about p _v =0.75H ₀ , the existence of the vacuum degree is equivalent to increasing the nozzle's pressure. Acting head. Under the same effective water head, the flow capacity of the nozzle with the same section is 1.32 times that of the orifice. Therefore, the utility model uses the hydraulic nozzle outflow principle to design the new structure of the rainwater well cover, which can automatically form the nozzle inflow at the water inlet according to the water volume of the road area and the inflow situation at the rainwater well cover, and the negative pressure suction type Increase pavement drainage.

The utility model facilitates the maintenance of drainage of the rainwater well during the rainy season; the matching device is simple and can be used on the existing rainwater well, and the rainwater well does not need to be modified, which greatly facilitates the use and popularization of the utility model.

Claims (1)

1. a negative pressure suction type increases row's catch basin cover automatically, comprise the inlet opening on catch basin cover and catch basin cover, it is characterized in that, bottom, described inlet opening is provided with negative pressure and produces frame, doubly, water inlet edge, inlet opening is right angle for the height of negative pressure generation frame and the 3-4 that inlet opening degree of depth sum is inlet opening width.