Internally-reinforced crescent rib branch pipe and using method thereof

Abstract

The invention provides an internally reinforced crescent rib bifurcated pipe which comprises a main bifurcated pipe body, at least two branch bifurcated pipe bodies and internally reinforced crescent ribs, the number of the branch bifurcated pipe bodies is at least two, the branch bifurcated pipe bodies are communicated with the main bifurcated pipe body, the internally reinforced crescent ribs are arranged between the two adjacent branch bifurcated pipe bodies, and the internally reinforced crescent rib bifurcated pipe further comprises a flow guide plate. And the guide plate is fixedly arranged between the two ends of the inner reinforced crescent rib. The guide plate and the two ends of the inner edge of the internally-reinforced crescent rib are welded into a whole, so that the inner edge tensile stress of the internally-reinforced crescent rib when the internally-reinforced crescent rib bears unbalanced force at the main branch pipe body and the branch pipe body is remarkably reduced, the width and the thickness of the internally-reinforced crescent rib are reduced, the manufacturing difficulty of a thick steel plate is reduced, and the manufacturing cost is reduced. The stratified tension crack resistance of the reinforced crescent rib in the thickness direction is remarkably improved, and the safety and reliability of the internally-reinforced crescent rib branch pipe are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pumped storage power station engineering, and particularly relates to an internally reinforced crescent-rib bifurcated pipe and a use method thereof. Background Art

[0002] With the rapid development of pumped storage power stations, water diversion systems mostly adopt the form of "one pipe for two machines" or "one pipe for multiple machines", so bifurcated pipes are needed. At present, as pumped storage power stations develop towards ultra-high rated head and large capacity, many steel bifurcated pipes with ultra-high HD values ​​(H is the head, D is the main pipe diameter) have appeared. The HD value of bifurcated pipes in some pumped storage power stations exceeds 4500mm. The internally reinforced crescent rib bifurcated pipe has the characteristics of clear force, small structural size, and good water flow pattern, and has been widely used in pumped storage power stations.

[0003] The traditional internally reinforced crescent rib bifurcated pipe includes: the main bifurcated pipe body, the branch bifurcated pipe body, and the internally reinforced crescent rib. This structure is mainly supported by the internally reinforced crescent rib to bear the unbalanced force at the main bifurcated pipe body and the branch bifurcated pipe body. The inner edge of the internally reinforced crescent rib bears tensile stress. At the same time, the crescent rib bears the unbalanced force at the openings of the branch bifurcated pipe bodies on the left and right sides, and there is tensile stress along the thickness direction of the internally reinforced crescent rib. The crescent rib bifurcated pipe of the ultra-high head pumped storage power station is subject to extremely high internal water pressure, and the stress at the inner edge of the internally reinforced crescent rib is often large, even exceeding the specification limit. Therefore, the industry currently mainly meets the stress requirements by increasing the width and thickness of the internally reinforced crescent rib. Increasing the width and thickness of the internally reinforced crescent ribs will increase the project investment and the difficulty of steel plate production, and the flow state of water will deteriorate. Especially with the increase of the thickness of the internally reinforced crescent ribs, the crescent rib parent material is prone to lamellar tearing. Under the action of the periodic cyclic tensile stress of the pumped-storage power station, if lamellar tearing occurs in the internally reinforced crescent ribs, the cracks will expand rapidly until the structure is destroyed, posing a huge threat to the safe and stable operation of the pumped-storage power station. Summary of the invention

[0004] The purpose of the present invention is to provide an internally reinforced crescent-rib bifurcated pipe to overcome the above-mentioned technical problems existing in the prior art.

[0005] Another object of the present invention is to provide a method for using an internally reinforced crescent-rib bifurcated pipe to meet the ultra-high HD value stress requirements.

[0006] To this end, the technical solution provided by the present invention is as follows: A forked pipe with an internal reinforcement crescent rib comprises a main forked pipe body, a branch forked pipe body and an internal reinforcement crescent rib, wherein the branch forked pipe bodies are at least two and both are connected to the main forked pipe body, the internal reinforcement crescent rib is arranged between two adjacent branch forked pipe bodies, and also comprises a guide plate, wherein the guide plate is fixedly arranged between the two end heads of the internal reinforcement crescent rib.

[0007] The guide plate and two ends of the inner edge of the inner reinforced crescent rib are welded into one body.

[0008] The front edge of the guide plate cross section is circular, and the end is streamlined.

[0009] The guide plate is made of the same material as the inner reinforced crescent rib.

[0010] The upper end of the main bifurcated pipe body is connected to a main pipe transition cone, and the upper end of the main pipe transition cone is connected to the main pipe body.

[0011] The lower end of the branch pipe body is connected to a branch pipe transition cone, and the lower end of the branch pipe transition cone is connected to the branch pipe body.

[0012] A method for using an internally reinforced crescent-rib bifurcated pipe. When a fluid enters the internally reinforced crescent-rib bifurcated pipe, a guide plate is provided to reduce the inner edge tensile stress of the internally reinforced crescent-rib bifurcated pipe when the internally reinforced crescent-rib is subjected to unbalanced forces at a main bifurcated pipe body and a branch bifurcated pipe body, thereby meeting the ultra-high HD value stress requirement.

[0013] The ultra-high HD value is not less than 4500 mm.

[0014] The beneficial effects of the present invention are: The internally reinforced crescent-rib bifurcation pipe provided by the present invention is welded into a whole with the two ends of the inner edge of the internally reinforced crescent-rib through a guide plate, which significantly reduces the inner edge tensile stress of the internally reinforced crescent-rib when it is subjected to unbalanced forces at the main bifurcation pipe body and the branch bifurcation pipe body, thereby reducing the width and thickness of the internally reinforced crescent-rib, reducing the difficulty of manufacturing thick steel plates, significantly improving the anti-layered tensile cracking performance of the reinforced crescent-rib in the thickness direction, and improving the safety and reliability of the internally reinforced crescent-rib bifurcation pipe.

[0015] The front edge of the guide plate cross section of the present invention is circular and the end is streamlined, which improves the flow capacity of the crescent rib bifurcation pipe, has little effect on the flow state of the water flow, and reduces the head loss at the crescent rib bifurcation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the crescent rib body shape diagram of the traditional internally reinforced crescent rib bifurcated pipe; Figure 2 Mises stress cloud diagram of crescent rib of traditional internally reinforced crescent rib bifurcated pipe (N / mm 2 ); Figure 3 A three-dimensional perspective view of the internally reinforced crescent-rib bifurcated pipe with ultra-high HD value and low water loss coefficient according to the present invention; Figure 4 It is a three-dimensional diagram of the reinforced crescent rib and the guide plate in the present invention; Figure 5 It is a cross-sectional view of the guide plate of the present invention.

[0017] In the figure: 1. main bifurcated pipe body; 2. branch bifurcated pipe body; 3. internal reinforced crescent rib; 4. guide plate; 11. main pipe transition cone; 12. main pipe body; 21. branch pipe transition cone; 22. branch pipe body. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0019] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0020] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings. Example 1

[0021] The present invention provides an internally reinforced crescent rib bifurcated pipe, comprising a main bifurcated pipe body 1, a branch bifurcated pipe body 2 and an internally reinforced crescent rib 3, wherein the branch bifurcated pipe body 2 is at least two and both are connected to the main bifurcated pipe body 1, the internally reinforced crescent rib 3 is arranged between two adjacent branch bifurcated pipe bodies 2, and further comprising a guide plate 4, wherein the guide plate 4 is fixedly arranged between the two ends of the internally reinforced crescent rib 3. Figure 4 shown.

[0022] The traditional reinforced crescent rib fork pipe crescent rib shape is as follows Figure 1 As shown, the inner reinforced crescent rib 3 has to bear the unbalanced force at the main bifurcated pipe body 1 and the branch bifurcated pipe body 2, and the inner edge bears the tensile stress. At the same time, the crescent rib bears the unbalanced force at the openings of the branch bifurcated pipe bodies 2 on the left and right sides. There is tensile stress along the thickness direction of the inner reinforced crescent rib 3. The stress cloud diagram is shown in Figure 2 shown.

[0023] The internally reinforced crescent rib branch pipe provided by the present invention significantly reduces the tensile stress at the inner edge of the internally reinforced crescent rib 3 by arranging guide plates 4 at both ends of the internally reinforced crescent rib 3, thereby reducing the width and thickness of the internally reinforced crescent rib 3, reducing the difficulty of manufacturing thick steel plates, significantly improving the anti-layered tensile cracking performance of the reinforced crescent rib in the thickness direction, and improving the safety and reliability of the internally reinforced crescent rib 3 branch pipe. Example 2

[0024] On the basis of Example 1, the present invention provides an internally reinforced crescent rib bifurcated pipe, wherein the guide plate 4 and the two ends of the inner edge of the internally reinforced crescent rib 3 are welded into one body.

[0025] The guide plate 4 is welded to the two ends of the inner edge of the inner reinforced crescent rib 3 to form a whole, which significantly reduces the inner edge tensile stress of the inner reinforced crescent rib 3 when it is subjected to the unbalanced force of the main bifurcated pipe body 1 and the branch bifurcated pipe body 2. Example 3

[0026] Based on Example 1, the present invention provides an internally reinforced crescent rib bifurcated pipe, such as Figure 5 As shown, the front end of the guide plate 4 is circular in cross section and the end is streamlined.

[0027] The front edge of the guide plate 4 of the present invention is circular in cross section and the end is streamlined, which improves the flow capacity of the crescent rib bifurcation pipe, has little effect on the flow pattern of the water flow, and reduces the head loss at the crescent rib bifurcation pipe. Example 4

[0028] On the basis of Example 1, the present invention provides an internally reinforced crescent-shaped rib bifurcated pipe, wherein the guide plate 4 is made of the same material as the internally reinforced crescent-shaped rib 3 .

[0029] In order to improve the integrity of the guide plate 4 and the inner reinforced crescent rib after welding, the guide plate 4 and the inner reinforced crescent rib 3 are made of the same material. Example 5

[0030] Based on Example 1, the present invention provides an internally reinforced crescent rib bifurcated pipe, such as Figure 3 As shown, the upper end of the main bifurcated pipe body 1 is connected to a main pipe transition cone 11 , and the upper end of the main pipe transition cone 11 is connected to a main pipe body 12 .

[0031] The lower end of the branch pipe body 2 is connected to a branch pipe transition cone 21 , and the lower end of the branch pipe transition cone 21 is connected to a branch pipe body 22 .

[0032] By setting the main pipe transition cone 11 and the branch pipe transition cone 21, smooth transitions from the main pipe body 12 to the main bifurcated pipe body 1 and from the branch pipe body 2 to the branch pipe body 22 are achieved respectively, thereby reducing fluid resistance and preventing or reducing fluid energy loss caused by sudden changes in pipe diameter. Example 6

[0033] This embodiment provides a method for using an internally reinforced crescent-rib bifurcated pipe. When the fluid enters the internally reinforced crescent-rib 3 bifurcated pipe, the inner edge tensile stress of the internally reinforced crescent-rib 3 when it is subjected to unbalanced forces at the main bifurcated pipe body 1 and the branch bifurcated pipe body 2 is reduced by the provided guide plate 4, thereby meeting the ultra-high HD value stress requirement.

[0034] The ultra-high HD value is not less than 4500 mm.

[0035] In summary, the present invention significantly improves the stress-bearing performance of the internally reinforced crescent rib 3, significantly reduces the tensile stress at the inner edge of the internally reinforced crescent rib 3, optimizes the width and thickness of the internally reinforced crescent rib 3, reduces engineering investment, improves the anti-layered tearing performance of the internally reinforced crescent rib 3 in the thickness direction, and can reduce the head loss at the branch pipe.

[0036] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. An internally reinforced crescent rib bifurcated pipe, comprising a main bifurcated pipe body, a branch bifurcated pipe body and an internally reinforced crescent rib, wherein the branch bifurcated pipe bodies are at least two and both are connected to the main bifurcated pipe body, and the internally reinforced crescent rib is arranged between two adjacent branch bifurcated pipe bodies, characterized in that: It also includes a guide plate, which is fixed between the two end heads of the inner reinforced crescent rib.

2. The internally reinforced crescent-rib bifurcated pipe according to claim 1, characterized in that: The guide plate and two ends of the inner edge of the inner reinforced crescent rib are welded into one body.

3. The internally reinforced crescent-rib bifurcated pipe according to claim 1, characterized in that: The front edge of the guide plate cross section is circular, and the end is streamlined.

4. The internally reinforced crescent rib bifurcated pipe according to claim 1, characterized in that: The guide plate is made of the same material as the inner reinforced crescent rib.

5. An internally reinforced crescent-rib bifurcated pipe according to any one of claims 1 to 4, characterized in that: The upper end of the main bifurcated pipe body is connected to a main pipe transition cone, and the upper end of the main pipe transition cone is connected to the main pipe body.

6. An internally reinforced crescent-rib bifurcated pipe according to any one of claims 1 to 4, characterized in that: The lower end of the branch pipe body is connected to a branch pipe transition cone, and the lower end of the branch pipe transition cone is connected to the branch pipe body.

7. The method for using the internally reinforced crescent-rib bifurcated pipe according to claim 1, characterized in that: The fluid enters the internally reinforced crescent-rib bifurcated pipe, and the guide plate is set to reduce the inner edge tensile stress of the internally reinforced crescent-rib when it is subjected to the unbalanced force at the main bifurcated pipe body and the branch bifurcated pipe body, thereby meeting the ultra-high HD value stress requirement.

8. The method for using the internally reinforced crescent-rib bifurcated pipe according to claim 7, characterized in that: The ultra-high HD value is not less than 4500 mm.

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