Bucket blocking, positioning and assembling rotating wheel of impulse turbine

Abstract

The utility model relates to the technical field of rotating wheel structures, in particular to an impulse turbine water bucket blocking, positioning and assembling rotating wheel which comprises a wheel disc and a plurality of groups of water buckets evenly distributed on the periphery of the wheel disc, and a plurality of protruding portions arranged at intervals are arranged on the periphery of the wheel disc. In the circumferential direction of the wheel disc, a clamping groove is defined by every two adjacent protruding parts; each group of water buckets comprises a water bucket body, a connecting part connected with the water bucket body and a clamping block matched with the clamping groove; the connecting part and the protruding part are detachably connected through a connecting piece arranged in the axial direction of the wheel disc. By means of the runner, the problem that the bolts cannot run for a long time due to shearing force can be effectively solved, and the problem that the bolts cannot be arranged in practical application of the water bucket can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of runner structures, in particular to a bucket blocking positioning assembly runner for an impulse turbine. Background Art

[0002] With the development of hydropower, the runners of high-head, large-capacity Pelton turbines are becoming larger and larger. Pelton turbine runners consist of two parts: a disc and a bucket. Runner manufacturing currently falls into three main types: integral runners, combined runners, and welded runners. These include: integral casting; integral forging; rough-forging the disc and bucket sections separately, followed by welding the outer buckets and finishing; rough-forging the disc (or disc with bucket sections) and buckets (or outer buckets) separately, followed by welding and finishing; and structural methods where the buckets and disc are separately manufactured and then cross-connected to the disc (generally applicable to small or model runners). With the continuous increase in unit capacity, the transportation of power plants is restricted, and so are casting and forging capabilities.

[0003] In the prior art, a Chinese utility model patent document with publication number CN211975262U and publication date of November 20, 2020 was proposed. The technical solution disclosed in the patent document is as follows: A mosaic-type impulse turbine runner, comprising a disc and a water bucket group evenly distributed around the disc, the root of each water bucket of the water bucket group is provided with a connecting block, and a card slot is provided corresponding to each connecting block on the outer periphery of the disc, and the inner diameter of the bottom of the card slot is larger than the inner diameter at the outer end of the card slot; the connecting block is embedded in the card slot as a whole, and the root of the connecting block is in contact with the disc, and a positioning connector is provided on the inner side of the disc to radially fix the connecting block.

[0004] In the above-mentioned technical solution, the slots extend through both end faces of the impeller, giving the outer periphery of the impeller a gear-like shape. The locating bolts are threaded radially from the inside of the impeller to securely lock the connecting block to the impeller. This type of inlaid impulsive turbine runner is only suitable for model impellers. The locating connecting bolts are subject to shear forces due to the weight of the bucket. Long-term operation of the impeller will cause the bolts to break due to shear, making it unsuitable for large impulsive turbines or engineering applications. Furthermore, because the locating bolts are threaded radially from the inside, in actual engineering use, the locating bolts between the bucket and the impeller cannot be arranged due to the interference of the impeller and main shaft bolts. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model proposes an impulse turbine bucket blocking positioning assembly runner, which can effectively solve the problem that the bolts cannot operate for a long time due to shear force, and can improve the problem that the bolts cannot be arranged in the bucket in actual application.

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

[0007] A bucket-locking, positioning, and assembly runner for an impulse turbine comprises a wheel disc and several groups of buckets evenly distributed around the wheel disc. The outer circumference of the wheel disc is provided with several spaced-apart raised portions. Adjacent raised portions are enclosed to form a slot along the circumferential direction of the wheel disc. Each group of buckets comprises a bucket body, a connecting portion connected to the bucket body, and a clamping block matching the slot. The connecting portion and the raised portion are detachably connected via a connecting piece provided along the axial direction of the wheel disc.

[0008] The connecting portion is provided with a step matching the clamping block, and the clamping block is assembled on the step.

[0009] Along the axial direction of the wheel disc, the sum of the lengths of the protruding portion and the connecting portion matches the thickness of the wheel disc.

[0010] The lower surface of the connecting portion is in an arc shape matching the outer circumference of the wheel disc.

[0011] An annular groove is further provided on the outer periphery of the wheel disc, and the connecting portion is arranged in the annular groove. The connecting portion and the wheel disc are detachably connected via a connecting piece arranged along the axial direction of the wheel disc.

[0012] The clamping slot is a wedge-shaped slot, the clamping block is a wedge-shaped block, and the clamping block and the clamping slot are connected in a wedge-shaped assembly.

[0013] A positioning groove corresponding to the annular groove is further provided in the middle of the protruding portion, and the connecting portion passes through the positioning groove and is arranged in the annular groove.

[0014] The clamping block is wing-shaped.

[0015] In each group of water buckets, the number of the water bucket body and the connecting part is at least one, and the number of the clamping block is one.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In this utility model, the bucket and disc are detachably connected by means of a coupling member positioned axially between the connecting portion and the raised portion, through the interaction of a slot and a block, achieving optimal circumferential and radial positioning. This structure overcomes the existing problem of difficult bolt placement and disperses the tangential and centrifugal forces acting on the bucket onto the disc, effectively distributing and receiving the force. This structure also allows for easy replacement of the bucket, facilitating subsequent maintenance and replacement of the power station.

[0018] 2. In the present invention, a step matching the clamping block is provided on the connecting portion, and the clamping block is assembled on the step. This assembly method can effectively improve the force on the water bucket, and the gravity of the water bucket is completely applied to the step. The connecting piece between the water bucket and the wheel is no longer subjected to shear force, effectively improving the force situation of the water bucket and the connecting piece.

[0019] 3. Along the axial direction of the wheel disc, the sum of the lengths of the protrusion and the connecting portion matches the thickness of the wheel disc, making the structural arrangement more reasonable.

[0020] 4. The lower surface of the connecting portion is in an arc shape that matches the outer circumference of the wheel disc, making the connection more stable.

[0021] 5. The mutual cooperation between the annular groove and the connecting part makes the positioning and connection effects better.

[0022] 6. In the present invention, a wedge-shaped assembly connection is adopted between the clamping block and the clamping slot, which can position the hopper and the impeller in the radial direction. At the same time, the tangential force and centrifugal force on the hopper can be dispersed, and the force can be distributed to the impeller and the connecting parts, thereby improving the stress on the hopper, the impeller and the connecting parts, thereby extending the service life of the impeller, effectively improving the stress on the connecting parts, the hopper and the impeller, and ensuring stable, safe and reliable operation of the impeller.

[0023] 7. The clamping block is wing-shaped, which makes the axial and circumferential positioning of the bucket and the wheel more accurate.

[0024] 8. In each group of water buckets, there is at least one water bucket body and connecting part, and one clamping block, which facilitates quick installation and disassembly of the water bucket and improves the force applied to the water bucket. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of a partial structure of the present utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of one structure of the water bucket involved;

[0028] Figure 3 for Figure 2 A structural diagram of the middle water bucket from another perspective;

[0029] Figure 4 For Figure 2 Schematic diagram of the cross-sectional structure of the runner matching the middle water bucket;

[0030] Figure 5 For Figure 2 Schematic diagram of the planar structure of the runner matching the middle water bucket;

[0031] Figure 6 for Figure 1 Another structural schematic diagram of the water bucket involved in;

[0032] Figure 7 for Figure 6 A structural diagram of the middle water bucket from another perspective;

[0033] Figure 8 For Figure 6 Schematic diagram of the cross-sectional structure of the runner matching the middle water bucket;

[0034] Figure 9 For Figure 6 Schematic diagram of the planar structure of the runner matching the middle water bucket;

[0035] Figure 10 This is another partial structural diagram of the utility model;

[0036] Figure 11 for Figure 10 A schematic diagram of one structure of the water bucket involved;

[0037] Figure 12 for Figure 11 A structural diagram of the middle water bucket from another perspective;

[0038] Figure 13 For Figure 11 Schematic diagram of the cross-sectional structure of the runner matching the middle water bucket;

[0039] Figure 14 For Figure 11 Schematic diagram of the planar structure of the runner matching the middle water bucket;

[0040] Figure 15 for Figure 10 Another structural schematic diagram of the water bucket involved in;

[0041] Figure 16 for Figure 15 A structural diagram of the middle water bucket from another perspective;

[0042] Figure 17 For Figure 15 Schematic diagram of the cross-sectional structure of the runner matching the middle water bucket;

[0043] Figure 18 For Figure 15 Schematic diagram of the planar structure of the runner matching the middle water bucket;

[0044] Markings in the figure:

[0045] 1. Water bucket, 2. Block, 3. Connector, 4. Wheel, 5. Slot, 6. Annular groove, 7. Water-shedding hole, 8. Raised part. DETAILED DESCRIPTION

[0046] Example 1

[0047] As a basic embodiment of the present invention, the present invention includes a bucket positioning assembly runner for an impulse turbine, comprising a wheel disc 4 and a plurality of bucket groups 1 evenly distributed around the wheel disc 4. The outer periphery of the wheel disc 4 is provided with a plurality of spaced-apart raised portions 8. Along the circumferential direction of the wheel disc 4, adjacent raised portions 8 enclose a slot 5. Each group of buckets 1 includes a bucket body, a connecting portion connected to the bucket body, and a block 2 that matches the slot 5. Positioning is achieved through the mutual cooperation of the slot 5 and the block 2. Then, the bucket 1 and the wheel disc 4 are detachably connected together via a connector 3 provided along the axial direction of the wheel disc 4 between the connecting portion and the raised portion 8.

[0048] Example 2

[0049] As a preferred embodiment of the present invention, the present invention includes an impulse turbine bucket blocking positioning assembly runner, including a wheel disc 4 and a plurality of groups of buckets 1 evenly distributed around the wheel disc 4. A plurality of spaced protrusions 8 are provided on the outer periphery of the wheel disc 4. Along the circumferential direction of the wheel disc 4, adjacent protrusions 8 are enclosed to form a card slot 5. Each group of buckets 1 includes a bucket body, a connecting portion, and a card block 2 matching the card slot 5. One end of the connecting portion is connected to the bucket body, and the lower surface, i.e., the end face of the wheel disc 4, is in an arc shape matching the outer surface of the wheel disc 4. The card block 2 can be connected to the bucket body or to the connecting portion. Preferably, a step matching the card block 2 is provided on the connecting portion, and the card block 2 is assembled on the step.

[0050] The connecting portion and the protrusion 8 are detachably connected via a connecting piece 3 provided along the axial direction of the wheel disc 4. The sum of the lengths of the protrusion 8 and the connecting portion along the axial direction of the wheel disc 4 may be greater than or less than the thickness of the wheel disc 4. However, preferably, the sum of the lengths matches the thickness of the wheel disc 4, i.e., the sum of the lengths is equal to the thickness of the wheel disc 4.

[0051] Example 3

[0052] As another preferred embodiment of the present invention, refer to the attached Figure 1 ~Instruction manual attached Figure 5The utility model includes a bucket blocking positioning assembly runner for an impulse turbine, comprising a wheel disc 4 and a plurality of groups of buckets 1 evenly distributed around the wheel disc 4. A plurality of spaced-apart protrusions 8 are provided on the outer periphery of the wheel disc 4. Along the circumferential direction of the wheel disc 4, adjacent protrusions 8 are enclosed to form a card slot 5. Preferably, the card slot 5 can be a wedge-shaped groove. Each group of buckets 1 includes a bucket body, a connecting portion connected to the bucket body, and a card block 2 matching the card slot 5. Specifically, the card block 2 is a wedge-shaped block. The connecting portion is provided with a step matching the card block 2, and the card block 2 is assembled on the step.

[0053] Preferably, along the axial direction of the wheel disc 4, the sum of the lengths of the protrusion 8 and the connecting portion matches the thickness of the wheel disc 4. The lengths of the protrusion 8 and the connecting portion along the axial direction of the wheel disc 4 may be different, but preferably, the length of the protrusion 8 is half the thickness of the wheel disc 4, and the length of the connecting portion is also half the thickness of the wheel disc 4.

[0054] When the connecting portion is directly positioned on the outer periphery of the wheel disc 4, its lower surface forms an arc-shaped shape that matches the outer periphery of the wheel disc 4, facilitating better engagement with the wheel disc 4. The protrusion 8 and the connecting portion are each provided with a matching first engagement hole. When the connecting portion is placed on the outer periphery of the wheel disc 4, it is positioned by the engagement of the retaining groove 5 and the retaining block 2. The connecting portion is then connected to the protrusion 8 along the axial direction of the wheel disc 4 through the first engagement hole, achieving a detachable connection between the bucket 1 and the wheel disc 4. The connecting member 3 may be a connecting bolt.

[0055] Furthermore, to enhance structural stability, an annular groove 6 is provided on the outer circumference of the wheel disc 4. The position of this groove 6 matches the placement area of ​​the connecting portion, meaning that the cross-section of the wheel disc 4 can be stepped. The raised portion 8 is provided on the outer circumference of the wheel disc 4, i.e., on the upper stepped surface, while the connecting portion is provided within this annular groove 6, i.e., on the lower stepped surface. The connecting portion and the wheel disc 4 are each provided with a matching second engagement hole. The connecting portion and the wheel disc 4 are also detachably connected via connecting bolts arranged along the axial direction of the wheel disc 4.

[0056] The wheel disc 4 is also provided with a handle hole that matches the main shaft. The water bucket 1 is also provided with a water-throwing hole 7, which can be used as a lifting hole for hoisting the water bucket 1 when the water bucket 1 and the wheel disc 4 are assembled.

[0057] In order to improve the stability of the structure, in this embodiment, the wedge-shaped block and the wedge-shaped groove cooperate with each other to achieve wedge-shaped assembly, which can play a role in circumferential and radial positioning. At the same time, the wedge-shaped assembly can disperse the tangential force and centrifugal force exerted on the water bucket 1 to the wheel 4, thereby playing a role in force dispersion and force bearing; the axial force exerted on the water bucket 1 is borne by the connecting bolts.

[0058] Example 4

[0059] As another preferred embodiment of the present invention, the present invention further supplements and elaborates on the technical solution of the present invention on the basis of Example 3. Figure 1 And the instruction manual Figures 6-9 In this embodiment, the number of hopper bodies and connecting parts in each group of hoppers 1 is modified. In this embodiment, each group of hoppers 1 is treated as a separate body, and the number of hopper bodies and connecting parts in each group of hoppers 1 is at most two, and the number of the clamping block 2 is one.

[0060] Example 5

[0061] As another preferred embodiment of the present invention, refer to the attached specification. Figure 10 ~Instruction manual attached Figure 14 The present invention comprises a bucket-type impulsive turbine runner with a blocking and positioning assembly, comprising a wheel disc 4 and a plurality of bucket groups 1 evenly distributed around the wheel disc 4. Each bucket group 1 comprises a bucket body, a connecting portion connected to the bucket body, and a clamping block 2. The connecting portion is provided with a step that matches the clamping block 2, and the clamping block 2 is assembled on the step.

[0062] The outer circumference of the wheel disc 4 is further provided with a plurality of spaced-apart raised portions 8, and the raised portions 8 are further provided with positioning grooves matching the connecting portion, wherein the positioning grooves pass through both ends of the raised portions 8 along the circumferential direction of the wheel disc 4. The connecting portion is located in the positioning grooves. The shape of the lower surface of the connecting portion can match the bottom of the positioning groove. Preferably, the positioning grooves can be symmetrically arranged along the midpoint of the axis of the wheel disc 4. Along the circumferential direction of the wheel disc 4, two adjacent raised portions 8 enclose a slot 5 matching the card block 2.

[0063] The blocks 2 can be wing-shaped, meaning they can include radial blocks and axial blocks located at either end of the radial blocks. The radial blocks are positioned on a step, i.e., within the positioning grooves; the axial blocks can be positioned within the respective grooves 5, thereby achieving accurate axial and circumferential positioning of the bucket and the wheel disc. The axial blocks in two adjacent buckets 1 can share the same groove 5, meaning the two axial blocks can be axially staggered, or the sum of their lengths can match the width of the groove 5.

[0064] The protrusion 8 and the connection portion are respectively provided with matching first positioning pin holes, and the connection portion and the protrusion 8 are detachably connected via a connection member 3 provided along the axial direction of the wheel disc 4. The connection member 3 may be a pin.

[0065] To improve structural stability, an annular groove 6 is provided on the outer circumference of the wheel disc 4. This annular groove 6 communicates with the positioning groove, giving the wheel disc 4 a concave cross-section. Matching second positioning pin holes are also provided on the wheel disc 4 and the connecting portion. The connecting portion and the wheel disc 4 are detachably connected via a pin provided along the axial direction of the wheel disc 4.

[0066] The wheel disc 4 is also provided with a handle hole that matches the main shaft. The water bucket 1 is also provided with a water-throwing hole 7, which can be used as a lifting hole for hoisting the water bucket 1 when the water bucket 1 and the wheel disc 4 are assembled.

[0067] In this embodiment, the interaction between the block 2 and the slot 5 provides circumferential positioning, while radial positioning is achieved via the pin. Simultaneously, the pin, slot 5, and block 2 disperse the tangential and centrifugal forces acting on the bucket 1 onto the wheel 4, thus distributing and receiving the forces. The axial forces acting on the bucket 1 are borne by the annular groove 6 and the positioning groove.

[0068] Example 6

[0069] As another preferred embodiment of the present invention, the present invention further supplements and elaborates on the technical solution of the present invention on the basis of Example 5. Figure 1 And the instruction manual Figures 15-18 In this embodiment, the number of hopper bodies and connecting parts in each group of hoppers 1 is modified. In this embodiment, each group of hoppers 1 is treated as a separate body, and the number of hopper bodies and connecting parts in each group of hoppers 1 is at most two, and the number of the clamping block 2 is one.

[0070] To sum up, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

Claims

1. A bucket blocking and positioning assembly runner for an impulse turbine, comprising a wheel disc (4) and a plurality of buckets (1) evenly distributed around the wheel disc (4), characterized in that: The outer circumference of the wheel disc (4) is provided with a plurality of spaced-apart raised portions (8); along the circumferential direction of the wheel disc (4), adjacent raised portions (8) are enclosed to form a card slot (5); each group of water buckets (1) comprises a water bucket body, a connecting portion connected to the water bucket body, and a card block (2) matching the card slot (5); the connecting portion and the raised portion (8) are detachably connected via a connecting piece (3) provided along the axial direction of the wheel disc (4).

2. The Pelton turbine bucket blocking and positioning assembly runner according to claim 1, characterized in that: The connecting portion is provided with a step matching the clamping block (2), and the clamping block (2) is assembled on the step.

3. The Pelton turbine bucket blocking and positioning assembly runner according to claim 2, characterized in that: Along the axial direction of the wheel disc (4), the sum of the lengths of the protruding portion (8) and the connecting portion matches the thickness of the wheel disc (4).

4. The Pelton turbine bucket blocking and positioning assembly runner according to claim 1, characterized in that: The lower surface of the connecting portion is in an arc shape that matches the outer circumference of the wheel disc (4).

5. The Pelton turbine bucket blocking and positioning assembly runner according to any one of claims 1 to 4, characterized in that: An annular groove (6) is further provided on the outer periphery of the wheel disc (4), the connecting portion is arranged in the annular groove (6), and the connecting portion and the wheel disc (4) are detachably connected via a connecting piece (3) arranged along the axial direction of the wheel disc (4).

6. The Pelton turbine bucket blocking and positioning assembly runner according to claim 5, characterized in that: The clamping slot (5) is a wedge-shaped slot, the clamping block (2) is a wedge-shaped block, and the clamping block (2) and the clamping slot (5) are connected in a wedge-shaped assembly.

7. The Pelton turbine bucket blocking and positioning assembly runner according to claim 6, characterized in that: A positioning groove corresponding to the annular groove (6) is further provided in the middle of the raised portion (8), and the connecting portion passes through the positioning groove and is arranged in the annular groove (6).

8. The Pelton turbine bucket blocking and positioning assembly runner according to claim 7, characterized in that: The clamping block (2) is wing-shaped.

9. The Pelton turbine bucket blocking and positioning assembly runner according to claim 5, characterized in that: In each group of water buckets (1), the number of the water bucket body and the connecting portion is at least one, and the number of the clamping block (2) is one.

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