阅读说明：本技术 一种一分三的隔壁岔管 (Dividing wall bifurcated pipe with three parts ) 是由 程永光 苏凯 黄骞 刘奥博 闫少栋 李勇震 杨夏森 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种一分三的隔壁岔管,包括有主管、岔管、渐变段和隔壁,所述主管与三个岔管通过渐变段连接,渐变段内设有两个隔壁肋板,隔壁肋板将渐变段分为中间分隔管和左右对称的两边分隔管,隔壁肋板沿程的高度为线性均匀变化且将渐变段等分为过流面积相同的分隔管,且面积均为主管面积的三分之一。本发明一分三的隔壁岔管突破了传统隔壁岔管一分二的形式,拓宽了隔壁岔管的适用范围；相对于传统的三梁式岔管和月牙肋岔管,隔壁岔管由于除隔壁肋板外均为圆弧,因此水压均匀、受力条件好,具有便于布置的特点,且岔管沿程断面基本不变,可以有效地控制水头损失在较低的水平,可以与高水头地区一机多轮的冲击式水轮机布置形式较好地配合。(The invention discloses a dividing-into-three dividing wall bifurcated pipe which comprises a main pipe, bifurcated pipes, a gradual change section and dividing walls, wherein the main pipe is connected with three bifurcated pipes through the gradual change section, two dividing wall rib plates are arranged in the gradual change section, the gradual change section is divided into a middle separation pipe and bilaterally symmetrical two side separation pipes by the dividing wall rib plates, the height of the dividing wall rib plates along the way is linearly and uniformly changed, the gradual change section is divided into the separation pipes with the same flow passing area, and the area of each dividing wall rib plate is one third of the area of the main pipe. The dividing wall bifurcated pipe of the invention breaks through the traditional dividing wall bifurcated pipe one-to-two form, and widens the application range of the dividing wall bifurcated pipe; compared with the traditional three-beam branch pipe and crescent rib branch pipe, the dividing wall branch pipe is circular arc except the dividing wall rib plate, so that the water pressure is uniform, the stress condition is good, the characteristic of convenient arrangement is achieved, the on-way section of the branch pipe is basically unchanged, the water head loss can be effectively controlled at a lower level, and the branch pipe can be better matched with the arrangement form of a multi-wheel impact water turbine in a high water head area.)

1. A bulkhead bifurcated pipe characterized by: the main pipe is stably connected with three branch pipes through the transition sections, two rib plates of the partition walls are arranged in the transition sections, the height of the rib plates of the partition walls along the way is linearly and uniformly changed, the transition sections are equally divided into a middle separation pipe and two side separation pipes, the flow areas of the middle separation pipe and the two side separation pipes are the same, and the areas of the middle separation pipes and the two side separation pipes are one third of the area of the main pipe.

2. A three-in-one bulkhead bifurcated pipe as claimed in claim 1, wherein: the rib plates of the partition walls are of isosceles triangle plate-shaped structures, the heights of the rib plates of the partition walls are gradually reduced along the length direction of the transition section, the periphery of the transition section is respectively enclosed by an upper arc section, a lower arc section, a left arc section and a right arc section of the rib plates of the two partition walls, the upper surface, the lower surface, the left surface and the right surface of the rib plates of the two partition walls are respectively enclosed, the head end and the tail end of the rib plates of the two partition walls are respectively connected with a main pipe and a branch pipe, the upper arc section and the lower arc section of the transition section are symmetrically arranged, and the left arc section and the right arc section are symmetrically arranged.

3. A three-in-one bulkhead bifurcated pipe as claimed in claim 1, wherein: the three branch pipes are arranged in parallel, the areas of the three branch pipes are equal, and the areas of the three branch pipes are respectively one third of the area of the main pipe.

4. A three-in-one bulkhead bifurcated pipe as claimed in claim 1, wherein: the section parameters of the middle separation tube satisfy the equation:

wherein:the central angle of the arc obtained after the middle separating pipe is cut by two rib plates of the partition wall, h is the height of the rib plate of the partition wall at the section, and R is the height of the rib plate of the partition wall at the section₀Is the main pipe radius, R₂The radius of the intermediate separating tube.

5. A three-in-one bulkhead bifurcated pipe as claimed in claim 1, wherein: the section parameters of the two side separating pipes satisfy the equation:

wherein:the two side separating pipes are the central angles corresponding to the circular arcs of the overflowing part after being cut by the rib plates of the partition wall, h is the height of the rib plates of the partition wall at the section, and R is the height of the rib plates of the partition wall at the section₀Is the main pipe radius, R_1，3The radius separating the tubes on both sides.

Technical Field

The invention belongs to the technical field of pressure pipelines, and particularly relates to a dividing wall bifurcated pipe with three parts.

Background

When one pipeline needs to supply water for two or more units, branch pipes need to be arranged. The branch pipe is generally poor in stress condition, and the flow speed of water flow passing through the branch pipe is large. The current commonly used branched structures mainly have the shapes of Y, Bu, spherical branched structures, etc., and have limited application range. Meanwhile, as the structure is buried deeply and bears higher external water pressure, the conventional default structures such as the Y-shaped structure and the Bu-shaped structure have poorer external pressure resistance, more engineering measures are required to ensure the stability of the external pressure resistance of the structure, and the difficulty of manufacturing and construction is further increased. Therefore, finding a structural form with good structural stress condition is an effective way to solve the problems.

In the last century, three-beam branch pipes have been used more, but with the increase in scale of steel pipes, three-beam branch pipes with large diameters and high internal pressures have not met the economic and construction requirements, and crescent rib branch pipes, spherical branch pipes, beamless branch pipes and the like have been used.

In recent years, the development of hydropower stations in China gradually inclines to southwest areas, particularly to the Bruguet Bujiang areas, the hydropower stations in the areas have high water heads and large capacity, and the requirement on the stability of branch pipe structures is remarkably improved. In the design of a steel branch pipe bearing a high water head, the common bifurcation structure has poor stress condition, often needs a very thick steel plate and is not suitable for the development of hydropower in southwest areas. The bulkhead bifurcated pipe has the obvious advantages of flexible bifurcation, symmetrical structure, no default, strong capability of bearing internal and external water pressure, nearly parallel water flow lines and the like, does not need extra-large forged pieces in the aspect of manufacturing, and has less head loss in operation compared with the commonly used bifurcated pipe. Compared with the common Y-shaped and Bu-shaped branch pipes, the reinforced concrete bulkhead branch pipe has certain advantages in the aspects of arrangement, structure and hydraulics, has obvious economic benefit and has wide application prospect. However, the existing dividing wall bifurcated pipe has slow development and less application, the dividing wall bifurcated pipe with a relatively mature technology is in a one-to-two form, and the impulse turbine in the area of Yalu Tibet Bujiang is developing towards one machine with multiple wheels, so that the dividing wall bifurcated pipe matched with the structure is in urgent need. Therefore, the optimized expansion design of the shape of the dividing wall bifurcated pipe needs to be continuously developed and researched, and a dividing wall bifurcated pipe form suitable for one-machine multi-wheel arrangement is provided.

Disclosure of Invention

In order to solve the problems, the invention provides a dividing wall branch pipe form which can meet the development requirement of a high-head high-capacity hydropower station.

In order to achieve the purpose, the invention provides the following scheme:

the dividing-into-three dividing-wall bifurcated pipe comprises a main pipe, bifurcated pipes, a transition section and dividing walls, wherein the main pipe is stably connected with the three bifurcated pipes through the transition section, two dividing-wall rib plates are arranged in the transition section, the height of the dividing-wall rib plates along the way is linearly and uniformly changed, the transition section is equally divided into a middle separation pipe and two side separation pipes, the flow area of the middle separation pipe is the same as that of the two side separation pipes, and the area of the middle separation pipe is one third of that of the main pipe.

Furthermore, the rib plates of the partition walls are of isosceles triangle plate-shaped structures, the height of the rib plates of the partition walls is gradually reduced along the length direction of the transition section, the periphery of the transition section is respectively enclosed by an upper arc section, a lower arc section, a left arc section and a right arc section of the rib plates of the two partition walls, the upper surface, the lower surface, the left surface and the right surface of the rib plates of the two partition walls are respectively enclosed, the head end and the tail end of the rib plates of the two partition walls are respectively connected with the main pipe and the branch pipe, the upper arc section and the lower arc section of the transition section are symmetrically arranged, and the left arc section and the right arc section are symmetrically arranged.

Furthermore, the three branch pipes are arranged in parallel, the areas of the three branch pipes are equal, and the areas of the three branch pipes are respectively one third of the area of the main pipe.

Further, the section parameters of the intermediate separation tube satisfy the equation:

wherein:the central angle of the arc obtained after the middle separating pipe is cut by two rib plates of the partition wall, h is the height of the rib plate of the partition wall at the section, and R is the height of the rib plate of the partition wall at the section₀Is the main pipe radius, R₂The radius of the intermediate separating tube.

Further, the section parameters of the two side separation pipes satisfy the equation:

wherein:the two side separating pipes are the central angles corresponding to the circular arcs of the overflowing part after being cut by the rib plates of the partition wall, h is the height of the rib plates of the partition wall at the section, and R is the height of the rib plates of the partition wall at the section₀Is the main pipe radius, R_1，3The radius separating the tubes on both sides.

Compared with the prior art, the invention has the following beneficial technical effects:

compared with the traditional three-beam branch pipe and crescent rib branch pipe, the three-branch pipe is circular arc except rib plates of the partition, so that the water pressure is uniform, the stress condition is good, the three-branch pipe has the characteristic of convenience in arrangement, the round section along the way is basically unchanged, the water head loss can be effectively controlled at a lower level, the three-branch pipe can be well matched with the arrangement form of a multi-wheel impulse water turbine in a high water head area, the manufacturing and construction process is simplified, the cost is reduced, and the economic benefit is increased.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a perspective view of a transition section in the present invention.

Fig. 3 is a side view of a transition section of the present invention.

FIG. 4 is a schematic view of the cross-sectional shape and parameters of the transition section intermediate separation tube of the present invention.

FIG. 5 is a first schematic view of the shape and parameters of the cross section of the two-side separation tube of the transition section according to the present invention.

FIG. 6 is a second schematic diagram of the sectional shape and parameters of the two-side separation tube of the transition section of the present invention.

FIG. 7 is a schematic diagram of the variation rule of rib plates of the bulkhead of the gradual change section along the way size in the invention.

FIG. 8 is a schematic diagram of the variation rule of three branch pipes along the path radius in the invention.

In the figure: 1-main pipe, 2-transition section, 3-branch pipe, 4-rib plate of partition wall, 5-middle separation pipe and 6-two side separation pipe.

Detailed Description

The technical solution and the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

As shown in fig. 1 to 3, the bulkhead bifurcated pipe according to the present embodiment includes a main pipe 1, a transition section 2, a bifurcated pipe 3, and bulkhead ribs 4.

In the embodiment, the main pipe 1 and the branch pipe 3 are made of conventional circular pressure steel pipes. The main pipe 1 is a circular pressure steel pipe. The gradual change section is an irregular pipe formed by rolling and welding steel plates and connected with a plurality of sections of arcs. The main pipe 1 is connected with the branch pipe 3 through the transition section 2, the section shape of the transition section 2 is gradually divided by a circle, the radii of the two side sectors are the same, and the radii of the up-and-down connected circular arcs are gradually changed. The gradual change section 2 not only ensures that the area of the cross section of the pipeline is gradually enlarged, but also meets the requirement that the change rate of the area is uniform, and basically meets the requirement that the areas of the three parts are the same so as to ensure that the flow state is stable. The gradual change section 2 is provided with two rib plates 4 of the partition wall, the rib plates 4 of the partition wall are linearly changed along the course of the change rule of the height of the partition wall, the gradual change section 2 is equally divided into a middle separation pipe 5 and two side separation pipes 6 which have the same overflowing area, and the areas of the middle separation pipe and the two side separation pipes are one third of the area of the main pipe. The thickness of the rib plate 4 of the partition wall is determined according to the radius of the branch pipe 3 and the distance between the branch pipes 3, and the rib plate 4 of the partition wall finally equally divides the gradual change section 2 into three sections with the same area, wherein the area of the rib plate is one third of the area of the main pipe. The circular cross-section areas of the branch pipes 3 are the same, and the circle centers are on the same straight line. The rib plates 4 of the partition walls are of isosceles triangle plate-shaped structures, the heights of the rib plates are gradually reduced along the length direction of the transition section, the periphery of the transition section is respectively enclosed by an upper arc section, a lower arc section, a left arc section and a right arc section of the two rib plates of the partition walls, the upper surface, the lower surface, the left surface and the right surface of the two rib plates of the partition walls are respectively enclosed, the head end and the tail end of the two rib plates of the partition walls are respectively connected with a main pipe and a branch pipe, the upper arc section and the lower arc section of the transition section are symmetrically arranged, and the left arc section and the right arc section are symmetrically arranged.

The thickness of the rib plate 4 of the partition wall is determined according to the radius of the branch pipe 3 and the distance between the branch pipes 3, the gradual change section 2 finally equally divides the pipe section into three sections with the same area, and the area is one third of the area of the main pipe.

The circular cross-section areas of the branch pipes 3 are the same, and the circle centers are on the same straight line.

The section parameters of the middle separation tube satisfy the equation:

wherein:the central angle of the arc obtained after the middle separating pipe is cut by two rib plates of the partition wall, h is the height of the rib plate of the partition wall at the section, and R is the height of the rib plate of the partition wall at the section₀Is the main pipe radius, R₂The radius of the intermediate separating tube.

The section parameters of the two side separating pipes satisfy the equation:

wherein:the two side separating pipes are the central angles corresponding to the circular arcs of the overflowing part after being cut by the rib plates of the partition wall, h is the height of the rib plates of the partition wall at the section, and R is the height of the rib plates of the partition wall at the section₀Is the main pipe radius, R_1，3The radius separating the tubes on both sides.

Assume that the main pipe has a radius of R₀Area ofFor a one-to-three bulkhead branch, the ideal area for each of the three branches would beThe radius of each branch pipe is

And dividing the on-way length according to a certain step length from the gradual change initial section, wherein the height of the partition wall is linearly and uniformly reduced along the way, and the height of the partition wall of the gradual change ending section is 0. The partition walls are assumed to have no thickness.

For the intermediate divided tube, the pipeline section is divided by the branch tube into a graph consisting of two straight lines and two arc lines as shown in fig. 4, wherein each parameter is shown in the graph.

The area is divided into two triangles and two sectors for calculation, as shown in fig. 4, then:this can be simplified to:

r of initial section of transition section 2₂Is equal toH of initial section can be obtained by simultaneous solving according to the formula II and formula III₀Andthen, b is obtained according to the formula₀. Because the height of the rib plate 4 of the partition wall is linearly and uniformly reduced along the way, the height can be according to h₀And the step length is used for solving the h value of each calculated section. Formula III is a latent function expression, only havingAn unknown number, each section being obtained by iterative calculationThe value is substituted into formula I to obtain the distance b between rib plates 4 of the partition wall of the corresponding cross section, and substituted into formula II to obtain the R of the corresponding cross section₂。

The shape of the cross section of the two-side separating tube 6 is divided into two cases, namely the circle center and the pipeline cross section are on the different side or the same side of the separating wall.

The cross-sectional shape of the opposite side is shown in fig. 5, and the area of the two side separation tubes is calculated by subtracting the area of the triangle from the area of the sector. The cross-sectional shape of the same side is shown in fig. 6, and the area of the two side separation tubes is calculated by adding the area of the sector to the area of the triangle. Due to the nature of trigonometric functions, the area calculation formulas of the two can be unified into the following form:this can be simplified to:

similarly, the expression is an implicit function expression, and the cross sections can be obtained by iterative calculationThe value is substituted into the formula (iv) to obtain the rib spacing (b) of the partition wall of the corresponding cross section, and substituted into the formula (iv) to obtain the R of the corresponding cross section₃. In addition to the relationship R₃＝R₁Thus, the branch pipe radius and the partition wall pitch of each calculated cross section can be obtained.

Calculating and verifying:

the main pipe radius is taken as the unit length, and the height and the width of the partition wall of each section and the branch pipe radius of each section are respectively obtained.

Table 1 shows the calculation results of the partition wall size and the branch pipe radius size:

TABLE 1 characteristic section bulkhead dimension and branch pipe radius data table

The calculation results are shown in fig. 7 and 8 by visual charts, where fig. 7 shows the variation in the partition wall size along the way, and fig. 8 shows the variation in the bifurcated pipe radius along the way.

As can be seen from the figures 7 and 8, the cross section form change rule and the water flow state of the dividing wall branch pipe are uniform, and the water head loss of the branch pipe part can be effectively reduced.

The foregoing examples are provided for illustration and description of the invention only and are not intended to limit the invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, all of which fall within the scope of the invention as claimed.