Tail water pipe positioning device for water turbine volute

Abstract

The utility model discloses a draft tube positioning device for a water turbine volute, and relates to the technical field of axial flow type T-shaped volutes. The problems that when an existing draft tube is installed, operation difficulty is large, and blades are prone to being damaged are solved. At least two positioning columns are arranged at intervals in the circumferential direction, each positioning column is composed of a plurality of column bodies which are sequentially and detachably connected in an end-to-end mode, the top ends of the multiple positioning columns are suitable for being inserted into first threaded holes of a volute bottom ring respectively, and the bottom ends of the multiple positioning columns are suitable for being inserted into second threaded holes of an upper flange of a draft tube respectively. During installation, the draft tube flange is pushed to move towards the volute bottom ring along the positioning rod, meanwhile, the column penetrating through the second threaded hole is detached, collision between the column and the draft tube body is avoided, the positioning rod can play a role in guiding the draft tube flange, the draft tube flange moves according to a fixed path, manual positioning is not needed, and the installation efficiency is improved. The installation process is simpler, more convenient and more efficient, collision between the draft tube flange and the blade is avoided, and the blade structure completeness is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of axial - flow T - type volutes, and particularly relates to a draft tube positioning device for a water turbine volute. Background Technique

[0002] A water turbine is a power machine that converts the energy of water flow into rotational mechanical energy. It belongs to the turbomachinery in fluid machinery. As early as around 100 BC, the prototype of the water turbine, the waterwheel, appeared in China, which was used for irrigation and driving food - processing machinery. Modern water turbines are mostly installed in hydropower stations to drive generators to generate electricity. In a hydropower station, the water in the upstream reservoir is led to the water turbine through a penstock, which drives the rotation of the water turbine runner, drives the generator to generate electricity, and the water that has done work is discharged downstream through the draft tube. The higher the water head and the larger the flow rate, the greater the output power of the water turbine.

[0003] In the model test of an axial - flow water turbine, the model device generally adopts a T - type volute, and the installation method of the model adopts a bottom - mounted structure. When installing the draft tube after the installation of the runner of the model device, due to the large volume of the T - type volute, the extended area of its lower half will block the installation area of the upper flange of the draft tube. Workers need to manually align multiple threaded holes on the upper flange of the draft tube with multiple threaded holes on the volute bottom ring under the condition of blocked vision. This not only has a large operation difficulty, but also the upper flange of the draft tube is prone to bump and damage the blades during the positioning process, thereby affecting the true hydraulic performance of the runner.

[0004] In summary, when installing the existing draft tube, there are problems of large operation difficulty and easy damage to the blades. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem that workers need to manually align multiple threaded holes on the upper flange of the draft tube with multiple threaded holes on the volute bottom ring under the condition of blocked vision, which not only has a large operation difficulty, but also the upper flange of the draft tube is prone to bump and damage the blades during the positioning process, and thereby provides a draft tube positioning device for a water turbine volute.

[0006] The technical solution of the utility model is: a draft tube positioning device for a water turbine volute, including: positioning columns, having at least two arranged at intervals in the circumferential direction, and each of the positioning columns is composed of a plurality of column bodies detachably connected end to end in sequence;

[0007] The tops of the plurality of positioning posts are adapted to be respectively inserted into the first threaded holes of the volute bottom ring, and the bottoms of the plurality of positioning posts are adapted to be respectively inserted into the second threaded holes of the upper flange of the draft tube. During installation, the upper flange of the draft tube is pushed to move along the plurality of positioning posts towards the volute bottom ring, and the plurality of columns are disassembled one by one from the bottom end to achieve precise positioning of the plurality of first threaded holes and the plurality of second threaded holes.

[0008] Further, adjacent two of the columns are connected by threads.

[0009] Further, one end of the column has a connecting post extending outwards, the outer wall of the connecting post has an external thread, the other end of the column has a slot for inserting the connecting post, and the inner wall of the slot has an internal thread for cooperating with the external thread.

[0010] Further, the connecting post and the column are integrally formed.

[0011] Further, the top end of the positioning post is threadedly connected to the first threaded hole.

[0012] Further, there are two positioning posts symmetrically distributed with the center of the circle of the volute bottom ring as the center.

[0013] Further, the positioning post is a steel post.

[0014] Further, the positioning post is a cylindrical post.

[0015] The utility model has the following effects compared with the prior art:

[0016] 1. For the draft tube positioning device for a water turbine volute provided by the utility model, at least two positioning posts can completely align the multiple first threaded holes of the volute bottom ring and the multiple second threaded holes of the draft tube flange, and can also move the installation area of the upper flange of the draft tube outside the extended area of the lower half of the volute. During installation, only need to push the draft tube flange to move along the positioning rod towards the volute bottom ring and disassemble the column passing through the second threaded hole at the same time, avoiding the collision between the column and the draft tube body. The positioning rod can play a guiding role for the draft tube flange, making the draft tube flange move along a fixed path, without manual positioning, the installation process is more simple and efficient, and avoiding the collision between the draft tube flange and the blade, ensuring the integrity of the blade structure.

[0017] 2. For the draft tube positioning device for a water turbine volute provided by the utility model, adjacent two columns are connected by threads. During disassembly, only need to rotate the column to achieve separation, without the aid of other tools, and it is more convenient to use.

[0018] 3. The draft tube positioning device for the spiral case of a water turbine provided by the present utility model has the connecting column integrally formed with the column body, which not only has higher strength but also fewer manufacturing steps, and has better use effects.

[0019] 4. The draft tube positioning device for the spiral case of a water turbine provided by the present utility model selects the positioning column as a cylinder. The cylinder has a larger contact area with the first threaded hole and the second threaded hole, which can make the movement of the draft tube flange more stable. Moreover, there are no protrusions on the outer surface of the cylinder, which will not cause harm to the staff and reduces potential safety hazards. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the draft tube positioning device for the spiral case of a water turbine of the present utility model;

[0021] Figure 2 is Figure 1 the enlarged view of the column body 2 in

[0022] Figure 3 is Figure 1 the enlarged view of area A in

[0023] Figure 4 is Figure 1 the enlarged view of area B in

[0024] In the figure: 1. positioning column; 2. column body; 3. spiral case bottom ring; 4. first threaded hole; 5. draft tube upper flange; 6. second threaded hole; 7. connecting column; 8. slot; 9. spiral case body; 10. impeller; 11. blade; 12. draft tube body; 13. lifting platform. Detailed Embodiment

[0025] Detailed Embodiment 1: In combination with Figures 1 to 4 to illustrate this embodiment. This embodiment includes positioning columns 1, with at least two arranged at intervals along the circumferential direction. Each positioning column 1 is composed of a plurality of column bodies 2 detachably connected end to end in sequence. The tops of the plurality of positioning columns 1 are respectively adapted to be inserted into the first threaded holes 4 of the spiral case bottom ring 3, and the bottoms of the plurality of positioning columns 1 are respectively adapted to be inserted into the second threaded holes 6 of the draft tube upper flange 5. During installation, the draft tube upper flange 5 is pushed along the plurality of positioning columns 1 towards the spiral case bottom ring 3, and the plurality of column bodies 2 are disassembled one by one from the bottom end to achieve precise positioning of the plurality of first threaded holes 4 and the plurality of second threaded holes 6;

[0026] It should be noted that the shape of the draft tube body 12 is a conical tube. When the cylinder 2 at the bottommost end passes through the second threaded hole 6, it will move towards the outer wall of the draft tube body 12. Before the bottom end of the cylinder 2 contacts the outer wall of the draft tube body 12 and when the top end of the cylinder 2 is below the second threaded hole 6, the cylinder 2 is disassembled, that is, it will not contact the outer wall of the draft tube body 12. At the same time, the previous cylinder 2 can still continue to guide the draft tube flange. Repeat the above steps until the upper flange 5 of the draft tube contacts the spiral case bottom ring 3, and at the same time, all the cylinders 2 are disassembled;

[0027] The water turbine includes a spiral case body 9, an impeller 10, blades 11 and a draft tube body 12. During installation, the spiral case body 9 is hoisted above the draft tube body 12, and at the same time, the draft tube body 12 is placed on the lifting platform 13. The driving mode of the lifting platform 13 can be a hydraulic cylinder or a pneumatic cylinder, and the draft tube body 12 is driven to move through the lifting platform 13;

[0028] In this embodiment, at least two positioning columns 1 can completely align the multiple first threaded holes 4 of the spiral case bottom ring 3 and the multiple second threaded holes 6 of the draft tube flange, and can also move the installation area of the upper flange 5 of the draft tube outside the extended area of the lower half of the spiral case. During installation, only need to push the draft tube flange along the positioning rod towards the spiral case bottom ring 3 and disassemble the cylinder 2 passing through the second threaded hole 6, so as to avoid the cylinder 2 colliding with the draft tube body 12. The positioning rod can play a guiding role for the draft tube flange, so that the draft tube flange moves along a fixed path without manual positioning. The installation process is more simple and efficient, and it also avoids the draft tube flange colliding with the blades 11, ensuring the integrity of the blade 11 structure.

[0029] Specific Embodiment Two: Combine Figures 1 to 2 To illustrate this embodiment, adjacent two cylinders 2 are connected by threads. When disassembling the cylinder 2, only need to rotate the cylinder 2 to achieve separation without the aid of other tools, which is more convenient to use. Of course, adjacent two cylinders 2 can also be connected by other means, such as snap connection, magnetic attraction connection, etc. Other compositions and connection relationships are the same as those in Specific Embodiment One.

[0030] Specific Embodiment Three: Combine Figures 1 to 2To describe this embodiment, one end of the column body 2 in this embodiment has a connecting column 7 extending outward. The outer wall of the connecting column 7 has an external thread. The other end of the column body 2 has a slot 8 for inserting the connecting column 7. The inner wall of the slot 8 has an internal thread for mating with the external thread. Connecting the connecting column 7 of one column body 2 with the slot 8 of another column body 2 can achieve the detachable connection of two adjacent column bodies 2. Of course, slots 8 can also be provided at both ends of the column body 2, and two adjacent column bodies 2 are connected by a threaded rod. Other components and connection relationships are the same as those in the second specific embodiment.

[0031] Specific embodiment four: Combining Figure 1 To describe this embodiment, the connecting column 7 and the column body 2 in this embodiment are integrally formed. The integrally formed structure has higher strength, is not easily damaged during use, has a longer service life, and the manufacturing process is simpler. Of course, the connecting column 7 and the column body 2 can also be a split structure and can be connected by welding. Other components and connection relationships are the same as those in the third specific embodiment.

[0032] Specific embodiment five: Combining Figure 1 To describe this embodiment, the top end of the positioning column 1 in this embodiment is threadedly connected to the first threaded hole 4. Since the connecting column 7 at the top end of the positioning column 1 has an external thread, it can be threadedly connected to the first threaded hole 4, which facilitates the fixation of the positioning column 1 and is also simpler to disassemble, with better use effects. Of course, a friction plate can also be provided between the positioning column 1 and the first threaded hole 4 to temporarily fix the positioning column 1 by friction. Other components and connection relationships are the same as those in the first specific embodiment.

[0033] Specific embodiment six: Combining Figure 1 To describe this embodiment, there are two positioning columns 1 in this embodiment that are symmetrically distributed around the center of the spiral casing bottom ring 3. The two positioning columns 1 can achieve the positioning of the first threaded hole 4 and the second threaded hole 6, with the minimum number of positioning columns 1 used, thereby reducing the use cost. Of course, the number of positioning columns 1 is not fixed and can also be set to multiple, and the specific number can be flexibly adjusted according to the actual situation. Other components and connection relationships are the same as any one of the first to fifth specific embodiments.

[0034] Specific embodiment seven: Combining Figure 1 To describe this embodiment, the positioning column 1 in this embodiment is a steel column. The steel column has higher strength and is not easily bent during use, ensuring the accurate guiding of the draft tube flange, with better use effects. Of course, the positioning column 1 can also be an iron column, etc. Other components and connection relationships are the same as those in the sixth specific embodiment.

[0035] Specific embodiment eight: Combining Figure 1Regarding this embodiment, the positioning post 1 of this embodiment is a cylinder. By choosing the positioning post 1 as a cylinder, the contact area between the cylinder and the first threaded hole 4 and the second threaded hole 6 is larger, which can make the movement of the draft tube flange more stable. Moreover, there are no protrusions on the outer surface of the cylinder, which will not cause harm to the staff and reduces potential safety hazards. Of course, the positioning post 1 can also be a hexagonal post. The other components and connection relationships are the same as any one of the specific embodiments 1 to 5.

[0036] The usage method of this embodiment: First, assemble multiple columns 2 to form two positioning posts 1. Then, threadedly connect the two positioning posts 1 to the first threaded holes 4 of the volute bottom ring 3 respectively. Then, place the draft tube body 12 on the lifting platform 13, and insert the bottom ends of the two positioning rods into the second threaded holes 6 of the draft tube upper flange 5 respectively, so that the multiple second threaded holes 6 of the draft tube upper flange 5 can be completely aligned with the multiple first threaded holes 4 of the volute bottom ring 3. Start the lifting platform 13, and push the draft tube body 12 to drive the draft tube upper flange 5 to move upward along the positioning post 1. When the top end of the lowermost column 2 moves below the second threaded hole 6 and the bottom end does not abut against the outer wall of the draft tube body 12, disassemble this column 2. Since the draft tube body 12 is a conical tube, it can prevent the bottom end of the column 2 from colliding with the outer wall of the draft tube, thus affecting the upward movement of the draft tube body 12. Repeat the above steps until all the columns 2 are disassembled and the volute bottom ring 3 and the draft tube upper flange 5 are also completed for docking.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A draft tube positioning device for a turbine volute, characterized in that: It includes: A positioning column (1), comprising at least two of them spaced apart in the circumferential direction, each of the positioning columns (1) comprising a plurality of columns (2) which are detachably connected end to end; The top ends of the plurality of positioning columns (1) are suitable for being respectively inserted into the first threaded holes (4) of the volute bottom ring (3), and the bottom ends of the plurality of positioning columns (1) are suitable for being respectively inserted into the second threaded holes (6) of the tailwater pipe upper flange (5). During installation, the tailwater pipe upper flange (5) is pushed along the plurality of positioning columns (1) to move toward the volute bottom ring (3) and the plurality of column bodies (2) are disassembled one by one from the bottom end to achieve accurate positioning of the plurality of first threaded holes (4) and the plurality of second threaded holes (6).

2. A draft tube positioning device for a turbine volute according to claim 1, characterized in that: Two adjacent columns (2) are connected via threads.

3. A draft tube positioning device for a turbine volute according to claim 2, characterized in that: One end of the column (2) has a connecting column (7) extending outward, the outer wall of the connecting column (7) has an external thread, and the other end of the column (2) has a slot (8) for inserting the connecting column (7), and the inner wall of the slot (8) has an internal thread for matching with the external thread.

4. A draft tube positioning device for a turbine volute according to claim 3, characterized in that: The connecting column (7) and the column body (2) are integrally formed.

5. The draft tube positioning device for a turbine volute according to claim 1, characterized in that: The top end of the positioning column (1) is threadedly connected to the first threaded hole (4).

6. A draft tube positioning device for a turbine volute according to any one of claims 1 to 5, characterized in that: The positioning posts (1) have two symmetrically distributed with the center of the volute bottom ring (3) as the center.

7. A draft tube positioning device for a turbine volute according to claim 6, characterized in that: The positioning column (1) is a steel column.

8. A draft tube positioning device for a turbine volute according to any one of claims 1 to 5, characterized in that: The positioning column (1) is a cylinder.

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