Rotor bracket of variable-speed pumped storage unit

Abstract

The utility model discloses a rotor bracket of a variable-speed pumped storage unit, and relates to the technical field of rotor brackets. The outer side wall of the center body is provided with a circle of annular structure, the outer wall of the annular structure is provided with a plurality of rectangular planes in a cutting mode, the rectangular planes are evenly distributed around the annular structure, the vertical ribs correspond to the rectangular planes in a one-to-one mode, and one side of the bottom of each vertical rib is provided with a protruding block. A V-shaped groove is formed by the vertical rib and one side of the rectangular plane, an I-shaped groove is formed by the other side of the vertical rib and the rectangular plane, a notch is concavely formed in the middle of the long side of the protruding block, and the vertical rib is welded to the boss. According to the utility model, the groove structure form formed by the vertical ribs of the rotor bracket and the center body is changed, the original K-shaped groove is changed into the I-shaped groove, the welding amount is reduced by 50%, the relief grinding amount is reduced by 30%, and meanwhile, the groove structure form is suitable for narrow-gap welding of a robot, the influence of human factors is reduced, the welding efficiency is improved, the welding period is shortened, and the welding stability is improved; the quality of the rotor bracket is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rotor brackets, in particular to a rotor bracket for a variable speed pumped storage unit. Background Art

[0002] The rotor bracket is an important part of the hydro-turbine generator. It is subjected to the combined effects of torque, centrifugal force, etc. during operation. The variable-speed pumped storage unit has the ability to adjust power quickly and in a wide range. The operating conditions are more complex and should have sufficient strength and rigidity. Therefore, higher requirements are placed on the rotor bracket of the variable-speed pumped storage unit. The structure of the rotor bracket of the variable-speed pumped storage unit generally adopts a welded structure of 6, 7, 8 or 10 vertical ribs (steel plates) and a center body (forging). The vertical ribs of the rotor bracket are relatively thick, generally exceeding 200mm. There are the following difficulties: manual welding uses a "K" type groove, the welding amount is large, the welding process control requirements are strict, the requirements for welders are high, and the welding labor intensity is high; manual welding uses a large number of welding passes, a large number of welding joints, and unstable welding quality.

[0003] In the prior art, in February 2018, Gan Hongfeng et al. published a journal article titled "Rolling Forming and Automatic Welding Process of High-speed Generator Motor Rotors" in a journal titled "Motor Technology". The journal article disclosed that the traditional X-shaped groove between the rotor bracket ribs and the center body was changed to a K-shaped groove, which shortened the welding period and reduced the amount of cladding.

[0004] However, the above technical solution still has some shortcomings. On the one hand, the circumferential welding between the vertical ribs and the center body is inconvenient for observing the molten pool, controlling the welding process, and ensuring the stability of the welding parameters. On the other hand, the welding amount and grinding amount of the rotor bracket can be further reduced. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a variable-speed pumped-storage unit rotor bracket, and changes the groove structure formed by the vertical ribs and the center body of the rotor bracket from the original K-type groove to an I-type groove, thereby reducing the amount of welding and grinding. At the same time, the groove structure is suitable for robot narrow gap welding, thereby improving welding efficiency.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A variable speed pumped storage unit rotor support comprises a central body and a plurality of vertical ribs, wherein the outer wall of the central body is provided with a ring structure, the outer wall of the ring structure is cut with a plurality of rectangular planes, the rectangular planes are evenly distributed around the ring structure, the vertical ribs correspond to the rectangular planes one by one, a convex block is provided on one side of the bottom of the vertical rib, so that the vertical rib and the rectangular plane form a V-shaped groove on one side and an I-shaped groove on the other side, the middle part of the long side of the convex block is concave with a notch, and the vertical rib is welded on the boss.

[0008] The length of the protrusion is consistent with the length of the vertical rib, and the width is 1 / 5 of the thickness of the vertical rib.

[0009] The cross section of the projection is a right-angled trapezoid, and the obtuse angle and acute angle of the right-angled trapezoid are 135 degrees and 45 degrees respectively.

[0010] The protrusions are integrally formed with the vertical ribs.

[0011] The annular structure is integrally formed with the central body.

[0012] Two limited position process blocks are arranged at opposite corners of the rectangular plane.

[0013] The cross section of the limiting process block is L-shaped.

[0014] The depth of the notch is 2 mm and the width is 2 mm.

[0015] The thickness of the vertical ribs is less than 200 mm.

[0016] The thickness of the central body is less than 390 mm and the diameter is less than 1500 mm.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] 1. The utility model changes the groove structure of the vertical ribs and the central body of the rotor bracket from the original K-type groove to an I-type groove, which reduces the welding amount by 50% and the grinding amount by 30%. At the same time, the groove structure is suitable for robot narrow gap welding, improves welding efficiency, shortens welding cycle, can reduce welding joints and welding passes, reduces the influence of human factors, improves welding stability, and is conducive to ensuring welding quality; at the same time, a notch is arranged in the middle of the convex block at the bottom of the vertical rib, which can realize single-sided welding and double-sided forming of robot narrow gap welding, saves materials, improves production efficiency and product quality, and reduces processing technology; a V-shaped groove is arranged on the other side of the I-type groove, which ensures uniform welding on both sides after forming and meets the size requirements; an annular structure is arranged on the outer wall of the central body, and a rectangular plane is arranged on the annular structure, so that when welding with the vertical ribs, it can be in a flat welding position, thereby facilitating molten pool observation and welding process control, ensuring the stability of welding parameters, and improving the quality of the rotor bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementations, wherein:

[0020] Figure 1 It is the overall schematic diagram of the rotor bracket;

[0021] Figure 2 This is a schematic diagram of the rotor support ribs;

[0022] Figure 3 , Figure 4 It is a schematic diagram of the cross section of the reinforcement;

[0023] Figure 5 It is a rectangular plane schematic diagram of the central body;

[0024] Figure 6 It is a schematic diagram of the vertical ribs and the central body;

[0025] Figure 7 Schematic diagram of ribs and process blocks.

[0026] Markings in the figure:

[0027] 1. Vertical ribs, 2. Center body, 3. Bump, 4. Notch, 5. Limiting process block, 6. Ring structure, 7. Rectangular plane, 8. V-shaped groove, 9. I-shaped groove. DETAILED DESCRIPTION

[0028] Example 1

[0029] A variable speed pumped storage unit rotor support comprises a central body and a plurality of vertical ribs, wherein the outer wall of the central body is provided with a ring structure, the outer wall of the ring structure is cut with a plurality of rectangular planes, the rectangular planes are evenly distributed around the ring structure, the vertical ribs correspond to the rectangular planes one by one, a convex block is provided on one side of the bottom of the vertical rib, so that the vertical rib and the rectangular plane form a V-shaped groove on one side and an I-shaped groove on the other side, a notch is provided in the middle of the long side of the convex block, and the vertical rib is welded on the boss.

[0030] In this embodiment, the groove structure formed by the vertical ribs and the center body of the rotor bracket is changed from the original K-type groove to an I-type groove, which reduces the amount of welding and grinding, shortens the welding cycle, and can reduce the number of welding joints and welding passes; a V-shaped groove is set on the other side of the I-type groove to ensure uniform welding on both sides after forming and meet the size requirements; an annular structure is set on the outer wall of the center body, and a rectangular plane is set on the annular structure, so that when it is welded with the vertical ribs, it can be in a flat welding position, thereby facilitating molten pool observation and welding process control, ensuring the stability of welding parameters, and improving the quality of the rotor bracket.

[0031] Example 2

[0032] A variable speed pumped storage unit rotor support comprises a central body and a plurality of vertical ribs, wherein the outer wall of the central body is provided with a ring structure, the outer wall of the ring structure is cut with a plurality of rectangular planes, the rectangular planes are evenly distributed around the ring structure, the vertical ribs correspond to the rectangular planes one by one, a convex block is provided on one side of the bottom of the vertical rib, so that the vertical rib and the rectangular plane form a V-shaped groove on one side and an I-shaped groove on the other side, a notch is provided in the middle of the long side of the convex block, and the vertical rib is welded on the boss.

[0033] The length of the protrusion is consistent with the length of the vertical rib, and the width is 1 / 5 of the thickness of the vertical rib.

[0034] The cross section of the projection is a right-angled trapezoid, and the obtuse angle and acute angle of the right-angled trapezoid are 135 degrees and 45 degrees respectively.

[0035] The protrusions are integrally formed with the vertical ribs.

[0036] The annular structure is integrally formed with the central body.

[0037] Two limited position process blocks are arranged at opposite corners of the rectangular plane.

[0038] The cross section of the limiting process block is L-shaped.

[0039] In this embodiment, the groove structure formed by the vertical ribs and the center body of the rotor bracket is changed from the original K-type groove to an I-type groove, which reduces the amount of welding and grinding, shortens the welding cycle, and can reduce the number of welding joints and welding passes; a V-type groove is set on the other side of the I-type groove to ensure uniform welding on both sides after forming, thereby ensuring size requirements; an annular structure is set on the outer wall of the center body, and a rectangular plane is set on the annular structure, so that when it is welded with the vertical ribs, it can be in a flat welding position, thereby facilitating molten pool observation and welding process control, ensuring the stability of welding parameters, and improving the quality of the rotor bracket; at the same time, this embodiment sets two limited position process blocks at the diagonals of the rectangular plane to ensure the assembly accuracy of the vertical ribs and the center body.

[0040] Example 3

[0041] A variable speed pumped storage unit rotor support comprises a central body and a plurality of vertical ribs, wherein the outer wall of the central body is provided with a ring structure, the outer wall of the ring structure is cut with a plurality of rectangular planes, the rectangular planes are evenly distributed around the ring structure, the vertical ribs correspond to the rectangular planes one by one, a convex block is provided on one side of the bottom of the vertical rib, so that the vertical rib and the rectangular plane form a V-shaped groove on one side and an I-shaped groove on the other side, a notch is provided in the middle of the long side of the convex block, and the vertical rib is welded on the boss.

[0042] The length of the protrusion is consistent with the length of the vertical rib, and the width is 1 / 5 of the thickness of the vertical rib.

[0043] The cross section of the projection is a right-angled trapezoid, and the obtuse angle and acute angle of the right-angled trapezoid are 135 degrees and 45 degrees respectively.

[0044] The protrusions are integrally formed with the vertical ribs.

[0045] The annular structure is integrally formed with the central body.

[0046] Two detachable limiting process blocks are arranged at opposite corners of the rectangular plane.

[0047] The cross section of the detachable limiting process block is L-shaped.

[0048] The depth of the notch is 2 mm and the width is 2 mm.

[0049] The thickness of the vertical ribs is less than 200 mm.

[0050] The thickness of the central body is less than 390 mm and the diameter is less than 1500 mm.

[0051] The utility model changes the groove structure of the vertical ribs and the center body of the rotor bracket from the original K-type groove to the I-type groove, reducing the welding amount by 50% and the grinding amount by 30%. At the same time, the groove structure and size are suitable for robot narrow gap welding, improving welding efficiency, shortening welding cycle, reducing welding joints and welding passes, reducing the influence of human factors, improving welding stability, and ensuring welding quality; at the same time, a notch is set in the middle of the convex block at the bottom of the vertical rib, which can realize the robot narrow gap welding single-sided welding and double-sided forming, saving materials while improving production efficiency and product quality, and reducing processing technology; a V-shaped groove is set on the other side of the I-type groove, ensuring uniform welding on both sides after forming, and ensuring size requirements; an annular structure is set on the outer wall of the center body, and a rectangular plane is set on the annular structure, so that when welding with the vertical ribs, it can be in a flat welding position, thereby facilitating molten pool observation and welding process control, ensuring the stability of welding parameters, and improving the quality of the rotor bracket. .

[0052] The utility model is applied to the welding of the rotor bracket of the variable speed pumped storage unit in the water pump turbine: the rotor bracket is mainly welded by vertical ribs and a central body, the maximum thickness of the vertical ribs is 200 mm, the maximum thickness of the central body is 390 mm, the maximum diameter is 1500 mm, and the length is 8000 mm.

[0053] Rotor bracket assembly

[0054] Different from the conventional rotor bracket assembly, the utility model directly assembles the ribs with the center body, and accurately locates the center body processing surface reference line and the rib processing surface to realize the rotor bracket assembly:

[0055] (1) Place the rotor center body on the roller frame and level it;

[0056] (2) Fix two detachable limiting process blocks on the rectangular plane of the outer wall of the central body replacement structure;

[0057] (3) Place the vertical ribs on the corresponding plane of the rotor center body;

[0058] (4) Conduct dimensional inspection;

[0059] (5) Add auxiliary support and fix welding, which should not affect robot welding;

[0060] (6) Removal of process blocks;

[0061] (7) Check the assembly dimensions to ensure that the assembly is qualified.

[0062] Rotor bracket welding

[0063] (1) Preheating before welding: Use a far-infrared electric heating device or flame to preheat the bottom weld of the workpiece to be welded. The preheating temperature is determined according to the material and plate thickness of the rotor bracket, usually 80-100℃.

[0064] (2) Welding sequence identification: According to the weld length, the welding section position and welding sequence are compiled.

[0065] (3) Single-sided welding and double-sided forming parameters: wire extension length 17-18 mm, wire distance from the side wall 2-3 mm, gas flow 22-23 L / min, current 210-235 A, voltage 25-27 V, welding speed 24-28 cm / min, wire feeding speed 7-8 m / min.

[0066] (4) Carry out high-efficiency, high-quality welding of one layer or two layers. After each weld, use a wire brush to clean the weld. After every two layers of welding, use an air shovel to remove slag from the weld.

[0067] (5) Welding sequence: When the welding filling volume of the weld groove reaches a certain thickness, adjust the welding position, weld another vertical reinforcement weld, and weld the welds under this position in sequence to a certain thickness. Complete the vertical reinforcement welding according to the welding sequence, detect flaws according to the drawings, and check the dimensions.

[0068] (6) Stress relief heat treatment.

[0069] (7) Remove all auxiliary supports, perform flaw detection according to the drawings, and check the dimensions.

[0070] Dimensional inspection of rotor bracket after welding

[0071] After the rotor bracket is manufactured and the weld is ground to meet the design requirements, a dimensional inspection is carried out to confirm that the dimensions meet the design requirements.

Claims

1. A variable speed pumped storage unit rotor support, comprising a central body and a plurality of vertical ribs, characterized in that: The outer wall of the central body is provided with a circle of annular structure, and the outer wall of the annular structure is cut with a plurality of rectangular planes, and the rectangular planes are evenly distributed around the annular structure. The vertical ribs correspond to the rectangular planes one by one, and a protrusion is provided on one side of the bottom of the vertical rib, so that the vertical rib and the rectangular plane form a V-shaped groove on one side and an I-shaped groove on the other side. A notch is provided in the middle of the long side of the protrusion, and the vertical rib is welded on the boss.

2. A variable speed pumped storage unit rotor support according to claim 1, characterized in that: The length of the protrusion is consistent with the length of the vertical rib, and the width is 1 / 5 of the thickness of the vertical rib.

3. A variable speed pumped storage unit rotor support according to claim 2, characterized in that: The cross section of the projection is a right-angled trapezoid, and the obtuse angle and acute angle are 135 degrees and 45 degrees respectively.

4. A variable speed pumped storage unit rotor support according to any one of claims 1 to 3, characterized in that: The protrusions are integrally formed with the vertical ribs.

5. A variable speed pumped storage unit rotor support according to claim 4, characterized in that: The annular structure is integrally formed with the central body.

6. A variable speed pumped storage unit rotor support according to claim 4, characterized in that: Two limiting process blocks are arranged at opposite corners of the rectangular plane.

7. A variable speed pumped storage unit rotor support according to claim 6, characterized in that: The cross section of the limiting process block is L-shaped.

8. The variable speed pumped storage unit rotor support according to claim 4, characterized in that: The depth of the notch is 2 mm and the width is 2 mm.

9. The variable speed pumped storage unit rotor support according to claim 4, characterized in that: The thickness of the vertical ribs is less than 200 mm.

10. A variable speed pumped storage unit rotor support according to claim 4, characterized in that: The thickness of the central body is less than 390 mm and the diameter is less than 1500 mm.

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