Large water bucket type rotating wheel

Abstract

The utility model discloses a large-scale water bucket type rotating wheel, which relates to the technical field of water bucket rotating wheels, and comprises a rotating shaft, and upper and lower layered water buckets are arranged on the rotating shaft. The water bucket upper portion and the water bucket lower portion are combined into a whole through bolts, the detachable water diversion blade is installed at the joint of the water bucket upper portion and the water bucket lower portion to jointly form the water bucket type rotating wheel, the combined water bucket rotating wheel is connected with the rotating shaft through coupling bolts, and compared with an integral water bucket rotating wheel, the combined water bucket rotating wheel solves the problem that a large forge piece is too thick. And the repair process is simplified by the detachable water diversion blade.

Description

Technical Field

[0001] The utility model relates to the field of impulse turbines, in particular to a large-scale bucket-type runner. Background Art

[0002] Ultra-high head and large capacity impulse turbines are the key hydropower units to be developed in my country in the future, and the manufacturing of bucket runners is a key node. For large runners of 500MW, the manufacturing process of forged spokes + CNC machining + welding of external buckets is usually adopted. my country has carried out research and development work and has the manufacturing capability.

[0003] The material of the Pelton runner is an ultra-low carbon martensitic stainless steel forging blank, which is processed by a multi-axis CNC machine tool. For Pelton runners of larger size and capacity, greater demands are placed on the manufacturing capacity of key forgings. Limited by the forging capacity of forging manufacturers, the current manufacturing capacity of domestic forging manufacturers has exceeded that of domestic forging manufacturers, and blanks that meet the size restrictions cannot be forged. For super-large Pelton runners, the bucket profile is a multi-angle curved surface in space, which requires large deep cavity curved surface processing, and CNC processing will also be limited by machine tools. The manufacturing of larger Pelton runners has restricted the development of ultra-high head and large-capacity impact hydropower stations in my country. Summary of the invention

[0004] In view of this, the utility model aims to propose a combined bucket runner to solve the problem mentioned in the above background technology that the forging size is too large and exceeds the forging capacity, and the processing size of the CNC machining machine is limited.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The bucket-type impeller is horizontally divided into an upper part and a lower part. The bucket upper part and the bucket lower part are combined into a whole by bolts. A dove-tail groove is provided at the junction of the bucket upper part and the bucket lower part to install a detachable water-dividing blade. The tail of the detachable water-dividing blade is a T-shaped structure, which is embedded in the annular groove of the combination of the bucket upper part and the bucket lower part to clamp the detachable water-dividing blade to form a bucket-type impeller. The combined bucket-type impeller is connected to the rotating shaft as a whole by nuts and coupling bolts. The bucket-type impeller is forged with ultra-low carbon martensitic stainless steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a cross-sectional view of a Pelton wheel;

[0008] Figure 2 It is a longitudinal view of a Pelton wheel;

[0009] Figure 3 This is the plan layout of the Pelton wheel.

[0010] In the figure: 1. Upper part of the bucket; 2. Lower part of the bucket; 3. Bolt; 4. Water dividing edge; 5. Rotating shaft; 6. Nut; 7. Coupling bolt.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. The thickness of the forging blank of the Pelton wheel is only half of that of the integral forging wheel, which solves the difficulty of heat treatment of the ultra-thick martensitic stainless steel blank.

[0013] 2. It solves the influence of the capacity limitation of the forging hydraulic press. By reducing the thickness of the blank, larger diameter blank forgings can be realized.

[0014] 3. The Pelton wheel with upper and lower split realizes that the curved surface part of the bucket can be processed openly, and solves the limitation of deep cavity curved surface processing.

[0015] 4. The detachable water dividing edge can be replaced, which is convenient for maintenance in multi-sediment power stations. Specific implementation mode

[0016] The technical solution of the present utility model will be further described in detail below with reference to the figure.

[0017] It should be noted that the terms "upper", "lower" and other similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation mode.

[0018] As Figures 1-3 shown, the Pelton wheel is horizontally divided into an upper part and a lower part. The upper part 1 of the bucket and the lower part 2 of the bucket are combined into a whole by bolts 3. At the intersection position of the upper part 1 and the lower part 2 of the bucket, a dovetail groove is provided to install the detachable water dividing edge 4. The tail of the detachable water dividing edge 4 is a T-shaped structure, which is embedded in the annular groove formed by the combination of the upper part 1 and the lower part 2 of the bucket to clamp the detachable water dividing edge 4 to form a Pelton wheel. The combined Pelton wheel and the rotating shaft 5 are jointly connected into a whole by nuts 6 and coupling bolts 7. The Pelton wheel is forged from ultra-low carbon martensitic stainless steel.

[0019] The working principle of the present utility model is as follows:

[0020] The Pelton wheel uses the impact of high-speed water flow to convert kinetic energy into mechanical energy. The Pelton wheel needs to withstand the pulsating impact of high-speed water flow, and the bucket is in an alternating stress working condition. To ensure the safe operation of the runner, large martensitic stainless steel forgings with high strength and corrosion resistance are required for manufacturing. The water bucket flow channel profile adopts a complex spatial curved surface to improve the runner efficiency. The martensitic stainless steel forging enhances the fatigue resistance of the runner. Since multiple buckets are circumferentially arranged around the spoke, the machining of the surface of the bucket profile is limited, and the machining tool cannot reach the root area of the bucket. By using a horizontally split and combined Pelton wheel, the profile of the bucket is in an open state, and the machining limitation is eliminated.

[0021] The water bucket adopts an upper and lower combined structure, which can realize the manufacture of super-large stainless steel blank forgings.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] The above has made a detailed description of the preferred embodiment of the present utility model. However, the present utility model is not limited to the above embodiment, and various changes can be made without departing from the gist of the present utility model within the knowledge scope of those of ordinary skill in the art.

Claims

1. A large-scale Pelton runner, characterized in that: The Pelton wheel is horizontally divided into an upper part and a lower part. The upper part of the bucket (1) and the lower part of the bucket (2) are combined into a whole by bolts (3). At the junction of the upper part of the bucket (1) and the lower part of the bucket (2), a dovetail groove is provided to install a detachable water dividing edge (4). The tail of the detachable water dividing edge (4) is a T-shaped structure, which is embedded in the annular groove formed by the combination of the upper part of the bucket (1) and the lower part of the bucket (2) to clamp the detachable water dividing edge (4), forming a Pelton wheel. The combined Pelton wheel and the rotating shaft (5) are jointly connected into a whole by a nut (6) and a coupling bolt (7). The Pelton wheel is forged from ultra-low carbon martensitic stainless steel.

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