Impact turbine water bucket assembly rotating wheel without wheel disc

Abstract

The utility model relates to the technical field of rotating wheel structures, in particular to a wheel-disc-free water bucket assembly rotating wheel of an impulse turbine, which comprises a plurality of groups of water buckets, and each group of water buckets comprises a water bucket body and a connecting part extending outwards from the water bucket body; and the connecting part is directly connected with a main shaft of the water turbine through a connecting piece. The runner is assembled through the water bucket without the wheel disc, so that the efficient and low-cost manufacturing of the impact runner can be realized, and meanwhile, the transportation and manufacturing problems of large runner blanks are also solved.

Description

Technical Field

[0001] The utility model relates to the technical field of runner structures, in particular to an assembled runner of an impulse water turbine without a runner disk and buckets. Background Art

[0002] In the prior art, the runner of an impulse water turbine generally includes two parts, a runner disk and buckets. The runner disk is fastened to the main shaft. With the development of hydropower, the sizes of runners of high-head and large-capacity impulse water turbines are getting larger and larger. Due to the continuous increase in the capacity of the impulse unit, the transportation restrictions of the power station, and the forging and casting capacity limitations, the runner cannot be integrally forged and cast for manufacturing and transportation.

[0003] At present, the manufacturing of runners is mainly divided into three types: integral runners, combined runners, and welded runners, including: integral casting / forging processing; the runner disk with some buckets is respectively rough-forged / cast, then the outer buckets are surfacing-welded and then finish-machined; the runner disk (or the runner disk with some buckets) and the buckets (or the outer buckets) are respectively rough-forged / cast and then welded and then finish-machined; the buckets and the runner disk are respectively manufactured and then fork-connected to the runner disk and other structural methods.

[0004] With the increase in the capacity of the impulse unit and the increase in the size of the runner, the height dimensions of the runner disk and the buckets are quite different. Integral forging and casting will result in disadvantages such as long forging and casting cycles of the runner, long machining cycles of the runner, and high manufacturing costs. Due to the large size of the runner, integral forging and casting are restricted by the forging and casting capacity and cannot be carried out. When using surfacing welding of buckets or welding of the flow-through part of the buckets, due to welding reasons, there are defects such as slag inclusions and pores in the welds. Under the long-term jet impact, the abrasion of the buckets will be aggravated, and the maintenance cost is high. Welding of the buckets and the runner disk requires high welding technology and a long on-site welding and installation time. When the buckets and the runner disk are respectively manufactured and then fork-connected to the runner disk, the connection between the buckets and the turntable is prone to fracture. Summary of the Invention

[0005] To solve the above technical problems, the utility model provides an assembled runner of an impulse water turbine without a runner disk and buckets, which can realize the efficient and low-cost manufacturing of the impulse runner, and at the same time solve the transportation and manufacturing problems of large runner blanks.

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

[0007] An assembled runner of an impulse water turbine without a runner disk and buckets includes several groups of buckets. Each group of buckets includes a bucket body and a connecting part extending outward from the bucket body; the connecting part is directly connected to the main shaft of the water turbine through a connecting piece.

[0008] The connecting piece includes a screw and a nut. A fastening through-hole is provided on the connecting part, and a first blind hole is provided on the main shaft of the water turbine.

[0009] The connecting member further includes a bushing. The two ends of the bushing are respectively located in the butting through hole and the first blind hole, and a through hole for the screw to pass through is provided on the bushing.

[0010] Each set of buckets is connected to the main shaft of the water turbine through two sets of connecting members.

[0011] A positioning assembly is further provided between the connecting portion and the main shaft. The positioning assembly includes a positioning pin and a positioning pin fixing block that cooperate with each other.

[0012] The positioning pin fixing block is stepped.

[0013] The number of positioning assemblies on each set of buckets is two sets.

[0014] The connecting portion and the main shaft are respectively provided with positioning stop mouths that cooperate with each other.

[0015] Each set of buckets is integrally formed.

[0016] Each set of buckets includes at least one bucket body and a corresponding connecting portion.

[0017] Compared with the prior art, the beneficial effects of the present utility model are shown in:

[0018] 1. In the present utility model, the runner no longer has a separate wheel disc. Instead, the runner is directly cut into multiple sets of buckets, and innovatively, several sets of buckets are directly connected to the main shaft respectively to assemble a complete runner. The size of the buckets is small and not restricted by transportation. Due to the adoption of the non-wheel disc structure, the tangential force and centrifugal force received by the buckets can be distributed to components such as the main shaft flange through connecting members, etc., improving the force on the buckets and connecting members, achieving the effect of extending the life of the runner, effectively improving the force on the connecting components and buckets, and ensuring the stable, safe, and reliable operation of the runner.

[0019] Single sets of buckets and the main shaft of the water turbine are separately manufactured and processed numerically controlled, which can ensure the machining accuracy and consistency, effectively reduce the manufacturing cycle of the buckets, ensure the quality of the buckets, and prevent the abrasion of the buckets from being aggravated due to quality defects under the long-term impact of the jet flow. Moreover, during the operation of the power station, if the buckets are severely abraded and need to be maintained or replaced, the power station can separately maintain and replace single sets of buckets, effectively reducing the operation cost of the power station and reducing the manufacturing time of spare parts.

[0020] 2. Since all the holes provided on the main shaft of the water turbine are blind holes, it can play a good waterproof role and prevent the holes from rusting.

[0021] 3. The setting of the bushing can play a good positioning effect and is also convenient for the dispersion and bearing of force.

[0022] 4. Each set of buckets is connected to the main shaft of the water turbine through two sets of connecting members, and the connection is more stable, and it is also convenient for the dispersion and bearing of force.

[0023] 5. The setting of the positioning component can achieve a good positioning effect. Through the positioning pin, the tangential force and centrifugal force received by the water bucket can also be dispersed to the other water buckets and the main shaft, playing a role in force dispersion and force bearing; the axial force received by the water bucket is borne by the connecting piece.

[0024] 6. The positioning pin fixing block is in a stepped shape, making it more convenient and reliable to connect the positioning pin fixing block with the connecting part.

[0025] 7. The number of positioning components on each group of water buckets is two groups, with precise positioning and good force bearing.

[0026] 8. The connecting part and the main shaft are respectively provided with mutually matching positioning shoulders, which can achieve a good positioning effect.

[0027] 9. Each group of water buckets is integrally formed, making the water bucket structure more stable.

[0028] 10. Each group of water buckets includes at least one water bucket body and the corresponding connecting part, which is convenient to be divided into single water bucket, multi-water bucket types or various combined structures according to specific layout, casting and forging ability, processing ability, transportation ability, etc. during design. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will further elaborate on the present utility model in conjunction with the specification drawings and specific embodiments, where:

[0030] Figure 1 is the schematic cross-sectional structure of the water bucket in the present utility model Figure 1 ;

[0031] Figure 2 is Figure 1 the schematic assembly structure of the water bucket in Figure 1 ;

[0032] Figure 3 is Figure 1 the schematic plan structure of the water bucket in Figure 1 ;

[0033] Figure 4 is Figure 1 the schematic assembly structure of the water bucket in Figure 2 ;

[0034] Figure 5 is Figure 1 the schematic plan structure of the water bucket in Figure 2 ;

[0035] Figure 6 is the schematic cross-sectional structure of the water bucket in the present utility model Figure 2 ;

[0036] Figure 7 is Figure 6Schematic diagram of the planar structure of the water bucket Figure 1 ;

[0037] Figure 8 is Figure 6 Assembly schematic diagram of the water bucket Figure 1 ;

[0038] Figure 9 is Figure 6 Schematic diagram of the planar structure of the water bucket Figure 2 ;

[0039] Figure 10 is Figure 6 Assembly schematic diagram of the water bucket Figure 2 ;

[0040] Markings in the figure:

[0041] 1. Water bucket body, 2. Connecting part, 3. Screw, 4. Through hole for fastening, 5. Nut, 6. Positioning pin, 7. Positioning pin fixing block, 8. Bush, 9. Positioning stop, 10. Main shaft, 11. Water throwing hole, 12. Positioning pin hole. Specific implementation mode

[0042] Embodiment 1

[0043] As a basic implementation mode of the present invention, the present invention includes an impulse turbine runner assembled with a water bucket without a wheel disc, which includes several groups of water buckets. Each group of water buckets includes a water bucket body 1 and a connecting part 2 extending outward from the water bucket body 1. The connecting part 2 is directly connected to the main shaft 10 of the water turbine through a connecting piece. The connecting piece may include a bolt and a nut that cooperate with each other. Through holes matching the bolt are respectively provided on the connecting part 2 and the main shaft 10. After the bolt passes through the connecting part 2 and the main shaft 10 in sequence, it is connected to the nut.

[0044] Embodiment 2

[0045] As a preferred implementation mode of the present invention, the present invention includes an impulse turbine runner assembled with a water bucket without a wheel disc, which includes several groups of water buckets. Each group of water buckets includes a water bucket body 1 and a connecting part 2 extending outward from the water bucket body 1. The connecting part 2 is directly connected to the main shaft 10 of the water turbine through a connecting piece.

[0046] Among them, the connecting piece may include a screw 3 and a nut 5. A through hole for fastening 4 is provided on the connecting part 2, and a first blind hole is provided on the main shaft 10 of the water turbine. One end of the screw 3 passes through the through hole for fastening 4, inserts into the first blind hole, and is threadedly connected to the main shaft 10, and the other end is locked by the nut 5.

[0047] Embodiment 3

[0048] As another preferred embodiment of the present utility model, the present utility model includes an impulse turbine discless bucket assembled runner, which includes a plurality of groups of buckets. Each group of buckets includes a bucket body 1 and a connecting portion 2 extending outward from the bucket body 1. The connecting portion 2 is directly connected to the main shaft 10 of the water turbine through a connecting member. A positioning assembly is further provided between the connecting portion 2 and the main shaft 10, and the positioning assembly includes a cooperating positioning pin 6 and a positioning pin fixing block 7.

[0049] Specifically, a butting through hole 4 and a positioning pin hole 12 are provided on the connecting portion 2, and a first blind hole and a second blind hole are provided on the main shaft 10. The connecting member includes a screw 3 and a nut 5. One end of the screw 3 passes through the butting through hole 4 and is inserted into the first blind hole, and is threadedly connected to the main shaft 10, and the other end is locked by the nut 5. One end of the positioning pin 6 passes through the positioning pin hole 12 and is inserted into the second blind hole, and then the positioning pin 6 is fixed by the positioning pin fixing block 7 to prevent the positioning pin 6 from falling off. Among them, the positioning pin fixing block 7 and the connecting portion 2 can be fixedly connected by bolts or by threads.

[0050] Embodiment 4

[0051] As yet another preferred embodiment of the present utility model, the present utility model includes an impulse turbine discless bucket assembled runner, which includes a plurality of groups of buckets integrally formed respectively. Each group of buckets includes a bucket body 1 and a connecting portion 2 extending outward from the bucket body 1. The connecting portion 2 is directly connected to the main shaft 10 of the water turbine through a connecting member. Two groups of positioning assemblies are further provided between the connecting portion 2 and the main shaft 10, and each group of positioning assemblies includes a cooperating positioning pin 6 and a positioning pin fixing block 7.

[0052] Specifically, referring to the attached Figure 1 ~attached Figure 3 ~to the specification, a water throwing hole 11, a butting through hole 4 and two positioning pin holes 12 are provided on the connecting portion 2. A first blind hole and two second blind holes are provided on the main shaft 10. Among them, the water throwing hole 11 can be used as a lifting hole for use during the hoisting of the bucket.

[0053] The connecting member includes a screw 3 and a nut 5. One end of the screw 3 passes through the butting through-hole 4 and is inserted into the first blind hole, and is threadedly connected to the main shaft 10. The other end is locked by the nut 5. One end of each of the two positioning pins 6 passes through the corresponding positioning pin hole 12 and is then inserted into the second blind hole, and the positioning pins 6 are fixed by the corresponding positioning pin fixing blocks 7 to prevent the positioning pins 6 from falling off. Among them, the positioning pin fixing block 7 and the connecting portion 2 can be fixedly connected by bolts. In order to achieve the stability of the connection between the positioning pin fixing block 7 and the connecting portion 2, the positioning pin fixing block 7 can be in a stepped shape, and the connecting portion 2 is provided with a concave hole that matches the shape and size of the positioning pin fixing block 7 and communicates with the positioning pin hole 12, so that a small bolt can be used between the positioning pin fixing block 7 and the connecting portion 2 to achieve butting.

[0054] Furthermore, the connecting portion 2 and the main shaft 10 are respectively provided with mating positioning shoulders 9. The positioning shoulders 9 and the positioning pins 6 can play a role in circumferential, radial and axial positioning. Through the positioning shoulders 9 and the positioning pins 6, the tangential force and centrifugal force received by the water buckets can be dispersed to the other water buckets and the main shaft 10, playing a role in force dispersion and force bearing. The axial force received by the water buckets is borne by the connecting member.

[0055] Embodiment 5

[0056] As another preferred embodiment of the present invention, this embodiment further refines the technical solution of the water of the present invention on the basis of Embodiment 4. In the present invention, each group of water buckets includes at least one water bucket body 1 and the corresponding connecting portion 2. Refer to the attached Figure 1 、the attached Figure 4 and the attached Figure 5 of the specification. Each group of water buckets includes two water bucket bodies 1 and two connecting portions 2 corresponding to the two water bucket bodies 1 respectively. It can be divided into single water bucket, multi-water bucket type or various combined structures according to specific layout, casting and forging ability, processing ability, transportation ability, etc. during design. Among them, the single water bucket specifically refers to: each group of water buckets in the entire runner includes a water bucket body 1 and a connecting portion 2. The multi-water bucket type specifically refers to: in the entire runner, each group of water buckets includes at least two water bucket bodies 1 and the corresponding connecting portions 2. The various combined structures specifically refer to: in the entire runner, some water buckets include a water bucket body 1 and a connecting portion 2, and some water buckets include at least two water bucket bodies 1 and the corresponding connecting portions 2.

[0057] Embodiment 6

[0058] As another preferred embodiment of the present utility model, the present utility model includes an impulse turbine diskless bucket assembly runner, which includes a plurality of groups of buckets. Each group of buckets includes a bucket body 1 and a connecting portion 2 extending outward from the bucket body 1. The connecting portion 2 is directly connected to the main shaft 10 of the water turbine through a connecting member. A positioning assembly is further provided between the connecting portion 2 and the main shaft 10, and the positioning assembly includes a cooperating positioning pin 6 and a positioning pin fixing block 7.

[0059] Among them, the connecting member may include a screw 3, a nut 5, and a bushing 8. A fastening through hole 4 is provided on the connecting portion 2, and a first blind hole is provided on the main shaft 10 of the water turbine. Both ends of the bushing 8 are respectively located in the fastening through hole 4 and the first blind hole, and a through hole for the screw 3 to pass through is provided on the bushing 8.

[0060] Embodiment 7

[0061] As another preferred embodiment of the present utility model, the present utility model includes an impulse turbine diskless bucket assembly runner, which includes a plurality of groups of buckets. Each group of buckets includes a bucket body 1 and a connecting portion 2 extending outward from the bucket body 1. The connecting portion 2 is directly connected to the main shaft 10 of the water turbine through two groups of connecting members. Each group of connecting members includes a screw 3, a nut 5, and a bushing 8.

[0062] Specifically, referring to the attached drawings of the specification Figure 6 ~the attached drawings of the specification Figure 8 As shown in the attached drawings, one water throwing hole 11 and two fastening through holes 4 are provided on the connecting portion 2. Two first blind holes are provided on the main shaft 10. Among them, the water throwing hole 11 can be used as a lifting hole for use during bucket hoisting.

[0063] Both ends of the bushing 8 are respectively located in the fastening through hole 4 and the first blind hole, and a through hole for the screw 3 to pass through is provided on the bushing 8. One end of the screw 3 sequentially passes through the fastening through hole 4 and the through hole and then is inserted into the first blind hole, and is threadedly connected to the main shaft 10, and the other end is locked by the nut 5.

[0064] Furthermore, mutually cooperating positioning shoulders 9 are respectively provided on the connecting portion 2 and the main shaft 10. The positioning shoulders 9 and the bushing 8 can play a role in circumferential, radial, and axial positioning. Through the positioning shoulders 9 and the bushing 8, the tangential force and centrifugal force received by the bucket can be dispersed to the remaining buckets and the main shaft 10, playing a role in force dispersion and force bearing. The axial force received by the bucket is borne by the screw 3.

[0065] Embodiment 8

[0066] As another preferred embodiment of the present utility model, this embodiment further refines the technical solution of the water of the present utility model on the basis of Embodiment 7. In the present utility model, each group of water buckets includes at least one water bucket body 1 and a corresponding connecting portion 2. Referring to the attached Figure 6 , the attached Figure 9 and the attached Figure 10 , each group of water buckets includes two water bucket bodies 1 and two connecting portions 2 corresponding to the two water bucket bodies 1 respectively. It can be divided into single water bucket, multi-water bucket type or various combined structures according to specific layout, casting and forging ability, processing ability, transportation ability, etc. during design. Among them, the single water bucket specifically refers to: each group of water buckets in the entire runner includes one water bucket body 1 and one connecting portion 2. The multi-water bucket type specifically refers to: in the entire runner, each group of water buckets includes at least two water bucket bodies 1 and corresponding connecting portions 2. The various combined structures specifically refer to: in the entire runner, some water buckets include one water bucket body 1 and one connecting portion 2, and some water buckets include at least two water bucket bodies 1 and corresponding connecting portions 2.

[0067] In summary, after reading the documents of the present utility model, all other corresponding transformation schemes made by those of ordinary skill in the art without creative mental labor according to the technical solution and technical concept of the present utility model fall within the scope protected by the present utility model.

Claims

1. An impulse turbine without a disc and bucket assembly runner, characterized in that: It comprises a plurality of groups of buckets, each group of buckets comprising a bucket body (1) and a connecting portion (2) extending outward from the bucket body (1); the connecting portion (2) is directly connected to a main shaft (10) of a water turbine via a connecting piece.

2. The impulsive turbine without a disc and bucket assembly runner according to claim 1, characterized in that: The connecting member comprises a screw rod (3) and a nut (5); a coupling through hole (4) is provided on the connecting portion (2); and a first blind hole is provided on the main shaft (10) of the turbine.

3. The impulsive turbine without a disc and bucket assembly runner according to claim 2, characterized in that: The connecting member further comprises a shaft sleeve (8), the two ends of which are respectively located in the handle through hole (4) and the first blind hole, and the shaft sleeve (8) is provided with a through hole for the screw rod (3) to pass through.

4. The impulsive turbine without a disc and bucket assembly runner according to claim 3, characterized in that: Each group of buckets is connected to the main shaft (10) of the turbine via two groups of connecting parts.

5. The impulsive turbine without a disc and bucket assembly runner according to claim 2 or 3, characterized in that: A positioning assembly is also provided between the connecting portion (2) and the main shaft (10), the positioning assembly comprising a matching positioning pin (6) and a positioning pin fixing block (7).

6. The impulsive turbine without a disc and bucket assembly runner according to claim 5, characterized in that: The positioning pin fixing block (7) is in a stepped shape.

7. The impulsive turbine without a disc and bucket assembly runner according to claim 5, characterized in that: There are two sets of positioning components on each set of water buckets.

8. The impulsive turbine without a disc and bucket assembly runner according to claim 5, characterized in that: The connecting portion (2) and the main shaft (10) are also respectively provided with positioning stoppers (9) that cooperate with each other.

9. The impulsive turbine without a disc and bucket assembly runner according to claim 8, characterized in that: Each set of water buckets is formed in one piece.

10. The impulsive turbine without a disc and bucket assembly runner according to claim 9, characterized in that: Each group of water buckets comprises at least one water bucket body (1) and a corresponding connecting portion (2).

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