CN202139577U - Pressure tunnel transition section structure - Google Patents

Abstract

The utility model relates to a pressure tunnel transition section structure. The pressure tunnel transition section structure comprises a rectangular opening (1), a round opening (2) and a curved surface (3) connected between the rectangular opening (1) and the round opening (2), wherein the curved surface (3) is a ruled surface which is formed by taking the rectangular opening (1) and the round opening (2) as neat lines. The utility model is advantageous in that the structure is smoother in the downstream direction, can reduce erosion of a high-speed discharge tunnel and prevent the tunnel from being damaged due to erosion to the greatest extent, and can reduce head loss of a diversion tunnel and provide more heads for power generation or other purposes.

Description

Pressurized tunnel transition section structure

One, technical field

The utility model includes to press and sluices or diversion tunnel, and the transition section structure of sluicing of pressing or diversion tunnel is particularly arranged.

Two, background technology

In the sluicing of pressure or diversion tunnel were arranged, transition section was widely used.Transition section usually is used between the difform tunnel flow section and plays smooth-going connection, generally includes two kinds of patterns, and a kind of pattern is the transition section by rectangular cross section transition circular cross section; Another kind of pattern is the transition section by circular cross section transition rectangular cross section.

Present normally used transition section structure is to adopt the oblique cone face that rectangular cross section or circular cross section are carried out the transition to circular cross section or rectangular cross section gradually four corners.At Parallel to the flow direction, there is certain sudden change in the transition section surface of this employing oblique cone face, for the tunnel that sluices at a high speed, causes the erosion phenomenon easily, causes the destruction of tunnel lining; For diversion tunnel, then strengthened head loss, caused the more energy loss.

Three, utility model content

In view of the deficiency that existing oblique cone face transition section exists, it is a kind of in the more smooth-going pressurized tunnel transition section structure of Parallel to the flow direction that the purpose of the utility model is to provide.

The concrete structure of the utility model is following: pressurized tunnel transition section structure, and have rectangular opening, circular port and connect the curved surface between rectangular opening and the circular port, described curved surface is with the be as the criterion ruled surface of line formation of rectangular opening and circular port.

Described rectangular opening is that water inlet, circular port are delivery port.

Described rectangular opening is that delivery port, circular port are water inlet.

The superior part of the utility model is that it is more smooth-going on Parallel to the flow direction, for the tunnel that sluices at a high speed, and the generation that can alleviate the erosion phenomenon, the tunnel of avoiding as much as possible causing because of erosion destroys the generation of situation; For diversion tunnel, then can reduce head loss, provide more head to be used for generating or other purposes.

Four, description of drawings

Accompanying drawing 1 is front view and the left view that corner adopts oblique cone mode transition transition section structure.

Accompanying drawing 2 is that the utility model transition section is by front view and the left view of circle to rectangular configuration.

Accompanying drawing 3 is that the utility model transition section is by front view and the left view of rectangle to circular configuration.

Five, the specific embodiment

The concrete structure of the utility model is please with reference to accompanying drawing 2 and accompanying drawing 3.This transition section has rectangular opening 1, circular port 2 and connects the curved surface 3 between rectangular opening and the circular port, and described curved surface 3 is with rectangular opening 1 and circular port 2 ruled surface that line forms that is as the criterion.

Rectangular opening 1 can be delivery port or water inlet; The circular port 2 that matches can be water inlet or delivery port.

Can obtain the equation (referring to accompanying drawing 2) of arbitrary section through mathematical way, a demand go out on the cross section arbitrarily some coordinates (x, y).The center of circle is positioned at the origin of coordinates, the wide b of known rectangle, high h, radius of circle r, angle [alpha], the ratio β of the distance of cross-sectional distance circular port and transition section length overall.With the partial cross section that is positioned at first quartile is example, defines according to ruled surface:

${\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="DEST\_PATH\_HSB00000647607400011.png,DEST\_PATH\_HSB00000647607400012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1=2\mathrm{\&pi;r}\frac{\mathrm{\&alpha;}}{360}$

$\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="DEST\_PATH\_HSB00000647607400011.png,DEST\_PATH\_HSB00000647607400012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2\mathrm{\&pi;\; r}}=\frac{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="DEST\_PATH\_HSB00000647607400011.png"\; state="\{\{state\}\}">l</figure-callout>}}_2}{2(b+h)}$ (being that equal proportion moves)

x ₁＝rcos(α)

y ₁＝rsin(α)

$x_2=\frac{b}{2}$

y ₂＝l ₂

x＝x ₁+β(x ₂-x ₁)

y＝y ₁+β(y ₂-y ₁)

Above equations simultaneousness, can try to achieve on this partial cross section arbitrarily some coordinates (x, y).Any some coordinates can similarly be obtained on the remainder cross section.Can prove that the cross section is not to be made up of arc section.Circle change side method for solving is similar.

When being used to produce, the partial cross-section segmentation provides parametric equation, and the constructor can lay template, concreting in view of the above.

Claims (3)

1. pressurized tunnel transition section structure has rectangular opening (1), circular port (2) and connects the curved surface (3) between rectangular opening (1) and the circular port (2), it is characterized in that curved surface (3) is with the be as the criterion ruled surface of line formation of rectangular opening (1) and circular port (2).

2. pressurized tunnel transition section structure as claimed in claim 1 is characterized in that rectangular opening (1) is a delivery port for water inlet, circular port (2).

3. pressurized tunnel transition section structure as claimed in claim 1 is characterized in that rectangular opening (1) is a water inlet for delivery port, circular port (2).

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