CN203222785U - Y-shaped flow guiding pier used for forebay rectification - Google Patents

Abstract

The utility model discloses a Y-shaped flow guiding pier used for forebay rectification and belongs to the technical field of water conservancy projects. The Y-shaped flow guiding pier used for the forebay rectification comprises a water inlet culvert, a forebay, a water inlet pond and water pump absorption tubes, wherein the water inlet culvert is connected with the forebay, the water inlet pond and the water pump absorption tubes in sequence, the water pump absorption tubes are arranged in the water inlet pond, a Y-shaped flow guiding pier body which is formed by three flow guiding plates is arranged on the front portion of the forebay, the flow guiding plate on the front portion of the Y-shaped flow guiding pier body faces the water inlet culvert, the included angle between the two flow guiding plates on the rear portion of the Y-shaped flow guiding pier body is 120 degrees, the height of the Y-shaped flow guiding pier body is two thirds of the depth of the water in the forebay, the length of the flow guiding pier body is 1.736 times of the diameter of each water pump absorption tube, the distance between the position where the three flow guiding plates of the Y-shaped flow guiding pier body are connected and the water inlet pond is 22.7 times of the diameter of each water pump absorption tube, and a plurality of small holes are formed in the two flow guiding plates on the rear portion of the flow guiding pier body. According to the Y-shaped flow guiding pier used for the forebay rectification, the problem of uneven velocity distribution of water in the forebay in front of a pump station is solved, the flow velocity of water in front of the water inlet pond of the pump station can tend to balance before the water flows into the water inlet ponds, and the efficiency of the pump station is improved.

Description

A Y-shaped diversion pier used for forebay rectification

technical field

The utility model relates to the structure of a forebay of a water pumping station, in particular to the structure of a diversion pier arranged in the forebay of a pumping station, and belongs to the technical field of water conservancy engineering.

Background technique

Due to the large diffusion angle of the forebay, the water flow will fall off the wall, and the deflection phenomenon is more serious, resulting in backflow and vortex in the forebay, resulting in poor water flow in the pool, uneven distribution of cross-sectional flow velocity, drastic change of flow velocity along the length of the pool and in the forebay. Sediment deposits, etc. are generated in the forebay. When the pumping station is turned on asymmetrically, it will cause the main flow to deflect, resulting in flow disorder and seriously affecting the operating efficiency of the pumping station.

In order to improve the water flow state of the positive water pumping station, the measures currently adopted include: bottom sill, non-continuous bottom sill, continuous deflecting flow sill, pressure water plate and deflector, etc. However, the current measures are difficult to completely eliminate the bad fluid state of the forebay.

Utility model content

The purpose of this utility model is to provide a Y-shaped diversion pier for the rectification of the forebay, which can effectively improve the bad flow state of the pump station, and does not induce new backflow areas or swirl. The Y-shaped diversion pier has a diversion effect, and the water flowing through the Y-shaped diversion pier will spread along its two wings, reducing the range of the water flow in the forebay, and through the rectification effect, the pump station enters the pool and moves closer to the flow speed. Uniformity, improving the water inlet conditions of the pump, can improve the efficiency of the pumping station.

The purpose of this utility model is achieved in this way, a Y-shaped diversion pier for the rectification of the forebay, including the water inlet culvert and the forebay connected with the water inlet culvert in sequence, the water inlet pool and the water pump suction pipe set in the water inlet pool , it is characterized in that, the front part of the forebay is provided with a Y-shaped diversion pier composed of three deflectors, and the front part of the Y-shaped diversion pier is a deflector facing the water inlet culvert, Y The angle between the two deflectors behind the tail of the type deflector pier is 120°.

The height of the Y-shaped diversion pier is 2/3 of the water depth of the forebay, and the length of the diversion pier is 1.736 times the diameter of the suction pipe of the water pump.

The distance from the intersection point of the three deflectors of the Y-shaped deflector pier to the water inlet pool is 22.7 times the diameter of the suction pipe of the water pump.

Several small holes are arranged on the two deflector plates behind the tail of the deflector pier.

The utility model solves the problem of uneven flow velocity distribution in the forebay of the forward water pumping station by setting a Y-shaped diversion pier, and can significantly improve the flow state of the forebay by adding a Y-shaped diversion pier to the forebay. The shape of the diversion pier is Y-shaped, arranged along the direction of the incoming flow, the angle behind the tail of the diversion pier is 120°, and the Y-shaped diversion pier has a diversion effect. When the water flows through the Y-shaped diversion pier, due to the action of the two wings of the Y-shaped diversion pier, the water flow will separate and spread along the direction of the opening angle of the Y-shaped diversion pier, reducing the range of the swirl area of the water flow in the forebay, and the cross-sectional flow velocity will be restored. distributed. Through the rectification effect of the Y-shaped diversion pier, the flow velocity near the inlet pool of the pump station tends to be uniform before entering the inlet pool. The utility model is applied to the construction and renovation of the pumping station, can increase the efficiency of the pumping station by about 10%, and can exert huge economic benefits.

Description of drawings

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

Fig. 2 is a schematic diagram of the structure of the Y-shaped diversion pier of the present invention.

In the figure: 1. Inlet culvert, 2. Y-shaped diversion pier, 3. Forebay, 4. Inlet pool, 5. Water pump suction pipe.

Detailed ways

As shown in Figure 1 and Figure 2, a Y-shaped diversion pier is used for the rectification of the forebay. The front end and rear end of the forebay are respectively connected to the water inlet culvert and the inlet pool, and the water pump suction pipe is placed in the inlet pool. A Y-shaped diversion pier consisting of three deflectors is set on the front floor of the front pool. The front of the Y-shaped diversion pier is a deflector facing the water inlet culvert, and the rear of the Y-shaped diversion pier is The angle between the two deflectors is 120°. The height of the Y-shaped diversion pier is 2/3 of the water depth of the forebay, and the length of the diversion pier is 1.736 times the diameter of the suction pipe of the water pump. The distance from the junction point of the three deflectors of the Y-shaped deflector pier to the water inlet pool is 22.7 times the diameter of the suction pipe of the water pump. When the water flows through the Y-shaped diversion pier, due to the action of the two wings of the Y-shaped diversion pier, the water flow will separate and spread along the direction of the opening angle of the Y-shaped diversion pier; the cross-sectional flow velocity will be redistributed. Through the rectification effect of the Y-shaped diversion pier, the flow velocity near the inlet pool of the pump station tends to be uniform before entering the inlet pool.

The Y-shaped diversion pier can be prefabricated by pouring the diversion pier first, and then set it in the required position of the forebay, or use concrete cast-in-place diversion pier in the forebay. A number of small holes are set on the two deflector plates behind the tail of the diversion pier to balance the water pressure difference behind the diversion pier and increase its stability.

Claims (4)

1. A Y-shaped diversion pier for the rectification of the forebay, comprising a water inlet culvert and a forebay connected successively with the inlet culvert, a water inlet pool and a water pump suction pipe arranged in the water inlet pool, it is characterized in that the front The front of the pool is equipped with a Y-shaped diversion pier composed of three deflectors. The front of the Y-shaped diversion pier is a deflector facing the water inlet culvert, and the two tails behind the Y-shaped diversion pier The included angle of the two deflectors is 120°. 2. A kind of Y-shaped diversion pier for the rectification of the forebay according to claim 1, characterized in that, the height of the Y-shaped diversion pier is 2/3 of the water depth of the forebay, and the diversion pier The length is 1.736 times the diameter of the water pump suction pipe. 3. A Y-shaped diversion pier for the rectification of the forebay according to claim 1, characterized in that the distance from the intersection point of the three deflectors of the Y-shaped diversion pier to the water inlet pool is 22.7 times the diameter of the water pump suction pipe. 4. A Y-shaped diversion pier for the rectification of the forebay according to claim 1, characterized in that a number of small holes are provided on the two deflector plates behind the tail of the diversion pier.

Images