CN204225067U - A kind of hydropower station tail water turn-off cavity - Google Patents

Abstract

The utility model relates to a kind of hydropower station tail water turn-off cavity, belongs to Hydraulic and Hydro-Power Engineering technical field.The utility model comprises the main hole of tail water, at least 2 tail water prop up hole, and tail water props up hole and is communicated with the main hole of tail water from the tail water of the same side main hole sidepiece, and tail water props up hole is all obliquely installed along water outlet direction, tail water main hole.The utility model flow condition is good, head loss is little, and being conducive to increases unit generation benefit, in addition, simple and reliable for structure, is easy to construction.

Description

Tailwater bifurcation structure of a hydropower station

technical field

The utility model relates to a tailwater fork hole structure of a hydropower station, which belongs to the technical field of water conservancy and hydropower engineering.

Background technique

In water conservancy and hydropower projects, due to the large-scale underground hydropower station with large reference flow and large scale, the layout method of "multiple units, one room and one hole" is basically adopted. A tailwater surge chamber is set behind the plant. In the surge chamber, several branch holes Converging to a main cave, such a structure has a large head loss, turbulent water flow, and a complex structure, which has disadvantages such as high cost, difficult design and construction, and affects power generation.

Utility model content

The technical problem to be solved by the utility model is to provide a tailwater bifurcation structure of a hydropower station with simple structure, good water flow conditions and small water head loss.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a tailwater branch tunnel structure of a hydropower station, including a tailwater main tunnel and at least two tailwater branch tunnels, and the tailwater branch tunnels are connected from the tailwater main tunnel on the same side. The side part is connected to the tailwater main tunnel, and the tailwater branch tunnels are arranged obliquely along the outlet direction of the tailwater main tunnel.

Further, the two side walls of the first tailwater branch tunnel arranged along the outlet direction of the tailwater main tunnel are respectively connected with the two side walls of the tailwater main tunnel.

Further, the connecting parts of the tailwater branch tunnel and the tailwater main tunnel are arc transitions.

Further, the tailwater branch tunnels are parallel to each other and connected to the same straight section of the tailwater main tunnel.

Further, the sections of the tailwater branch tunnel and the tailwater main tunnel are both in the shape of a city gate with rounded corners at the bottom of the round arched straight wall.

Further, the height of the tailwater branch tunnel at the connection part with the tailwater main tunnel is greater than or equal to the height of the tailwater branch tunnel body.

Further, the diameter of the tailwater main tunnel at the junction with the tailwater branch tunnel gradually increases with the increase in the number of tailwater branch tunnels, and the height of the tailwater main tunnel is not lower than the height of the tailwater branch tunnel.

The beneficial effects of the utility model are: the water flow condition is good, the water head loss is small, and it is beneficial to increase the power generation benefit of the unit; in addition, the structure is simple and reliable, and the construction is easy.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the A-A view of Fig. 1;

Fig. 3 is the B-B view of Fig. 1;

Fig. 4 is the C-C view of Fig. 1;

Fig. 5 is the D-D view of Fig. 1;

Fig. 6 is the E-E view of Fig. 1;

Marks in the picture: 1-Tailwater main cave, 2-Tailwater branch cave.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the utility model includes a tailwater main hole 1 and at least two tailwater branch holes 2, the tailwater branch holes 2 are connected to the tailwater main hole 1 from the side of the tailwater main hole 1 on the same side, and the tailwater The water branch holes 2 are arranged obliquely along the outlet direction of the tail water main hole 1 .

The utility model has good water flow conditions and small water head loss, which is beneficial to increase the power generation efficiency of the unit. In addition, the utility model has a simple structure and is easy to construct.

Preferably, the two side walls of the first tailwater branch tunnel 2 arranged along the outlet direction of the tailwater main tunnel 1 are respectively connected with the two side walls of the tailwater main tunnel 1, which is beneficial to reduce the friction at the end of the tailwater main tunnel 1. head loss.

Preferably, the connecting part of the tailwater branch tunnel 2 and the tailwater main tunnel 1 is a circular arc transition, which is beneficial to reduce the head loss at the connecting part.

Preferably, the tailwater branch tunnels 2 are parallel to each other and connected to the same straight section of the tailwater main tunnel 1, which is beneficial to reduce the head loss at the connection part.

Preferably, as shown in Figures 2 to 6, the cross-sections of the tailwater branch tunnel 2 and the tailwater main tunnel 1 are all in the shape of a gate with rounded corners at the bottom of the round arched straight wall, which has a simple structure and is easy to construct.

Preferably, as shown in Figure 2 and Figure 3, the height of the tailwater branch tunnel 2 at the connection part with the tailwater main tunnel 1 is greater than or equal to the body height of the tailwater branch tunnel 2, which is beneficial to reduce the head loss at the connection part.

Preferably, as shown in Figures 2 to 6, the diameter of the tailwater main tunnel 1 at the connection with the tailwater branch tunnel 2 gradually increases as the number of tailwater branch tunnels 2 increases, and the height of the tailwater main tunnel 1 is not low At the height of the tailwater branch tunnel 2, the specification and size of the tailwater main tunnel 1 can better meet the water flow conditions, so that the water flow can evenly transition.

Claims (7)

1. a hydropower station tail water turn-off cavity, it is characterized in that: comprise the main hole of tail water (1), at least 2 tail water prop up hole (2), described tail water props up hole (2) and is communicated with the main hole of tail water (1) from the main hole of the tail water of the same side (1) sidepiece, and tail water props up hole (2) is all obliquely installed along the main hole of tail water (1) water outlet direction.

2. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, is characterized in that: the two side that first tail water arranged along the main hole of tail water (1) water outlet direction props up hole (2) is connected hole (1) two side main with tail water respectively.

3. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, is characterized in that: described tail water props up hole (2) and the main hole of tail water (1) connecting portion is arc transition.

4. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, is characterized in that: described tail water props up hole (2) and is parallel to each other, and is connected to the main hole of tail water (1) same flat segments.

5. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, is characterized in that: described tail water props up hole (2) section, the main hole of tail water (1) section is circular arch stalk bottom roundings gateway opening type.

6. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, is characterized in that: described tail water props up hole (2) and is more than or equal to tail water at the height with the main hole of tail water (1) connecting portion and props up hole (2) body height.

7. a kind of hydropower station tail water turn-off cavity as claimed in claim 1, it is characterized in that: the diameter of hole (2) connecting portion is being propped up with tail water in the main hole of described tail water (1), increase gradually along with tail water props up hole (2) quantity increase, the main hole of tail water (1) is highly not less than tail water and props up hole (2) highly.