A new type of upper crown pump plate structure

Abstract

The present invention belongs to the technical field of hydraulic turbine mechanical equipment, and provides a novel upper crown pump plate structure, which includes an upper crown. A cylinder is arranged inside the upper crown, and rib plates are arranged between the upper crown and the cylinder. A detachable upper flat plate is arranged above the rib plates and the cylinder. The present invention is convenient for disassembly. After machining, only the upper flat plate needs to be removed to remove the iron filings in the inner cavity of the runner upper crown. When performing a static balance test, only the upper flat plate needs to be removed and the counterweight blocks are placed in the corresponding positions. The structure is simple and easy to operate, improving the work efficiency; it avoids the defects that the welds are not beautiful and extremely prone to cracking. The present invention greatly reduces the influence on the runner during the welding process, increases the stiffness of the runner, is both easy to disassemble and convenient to clean, makes the balancing process simpler and more convenient, and has good repeatability.

Description

Technical Field

[0001] The present invention relates to the technical field of hydroturbine mechanical equipment, and in particular to a novel crown pump plate structure. Background Art

[0002] A hydroturbine is a power machine that converts the energy of water flow into rotational mechanical energy. It belongs to the turbomachinery in fluid machinery. The water flow drives the runner to rotate, and the main shaft drives the generator to convert mechanical energy into electrical energy. The hydroturbine is one of the important hydropower equipment, an essential part of the hydropower generation industry, and an important equipment for making full use of clean and renewable energy to achieve energy conservation, emission reduction, and reduce environmental pollution. Its technological development is adapted to the development scale of China's hydropower industry. Driven by the strong demand for electricity in China, the hydroturbine manufacturing industry in China has entered a period of rapid development, with significant improvements in its economic scale and technical level. China's hydroturbine manufacturing technology has reached the world's advanced level.

[0003] The Francis hydroturbine has high efficiency and a wide head range, and is a widely used type of hydroturbine in various countries. With the continuous development of the runner structure, at present, most Francis runners adopt a cast-weld structure: the crown, lower ring, and blades are cast separately and then assembled and welded into a whole. The original structure has the following deficiencies: the debris generated during the machining process of the crown continuously falls into the pump plate, and the enclosed space is difficult to clean; during the static balance test of the runner, it is necessary to cut the crown pump plate, add and weld lead counterweights, and then seal and weld the cutting area. This kind of structure has cumbersome processes, high repeatability, low efficiency, and the welds are not beautiful and are extremely prone to cracking.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] The present invention provides a novel crown pump plate structure, including a crown. A cylinder is arranged inside the crown. A plurality of rib plates are arranged between the crown and the cylinder. A detachable upper flat plate is arranged above the rib plates and the cylinder, that is, the upper flat plate is detachably connected to the rib plates and is also detachably connected to the cylinder, which facilitates the disassembly and installation of the upper flat plate.

[0006] The rib plates are connected to the upper flat plate by screws, and the cylinder is connected to the upper flat plate by screws.

[0007] The number of screws between each rib plate and the upper flat plate is 4.

[0008] A counterweight cavity is formed among the crown, the rib plates, the upper flat plate, and the cylinder, and a counterweight device is arranged in the counterweight cavity.

[0009] The counterweight device is a lead counterweight.

[0010] The lead counterweight is fixedly welded to the crown.

[0011] The upper crown and the cylinder are fixed by welding.

[0012] In view of the problems of difficult processing and cleaning and difficult counterweight of the upper crown of the original mixed-flow runner, the present invention designs a new type of upper crown pump plate structure. The upper flat plate is connected to the rib plate and the cylinder welded to the upper crown by screws. After machining, only the upper flat plate needs to be removed to remove the iron filings in the inner cavity of the upper crown of the runner; when balancing, only the upper flat plate needs to be removed and the counterweight block is placed in the corresponding position; finally, after the inner hexagon screws are cleaned, the upper flat plate is fastened to the runner and "anaerobic thread locking sealant" is applied to complete the installation. The advantages and positive effects of the present invention are: greatly reducing the influence on the runner during the welding process, increasing the stiffness of the runner, being easy to disassemble and clean, making the counterweight process simpler and more convenient, and having good repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural view of the present invention;

[0014] Figure 2 is a schematic top view structural view of the present invention;

[0015] 1. Upper crown 2. Rib plate 3. Upper flat plate 4. Screw 5. Cylinder 6. Counterweight cavity 7. Counterweight lead block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] It should be noted that the installation methods and technical terms mentioned in the present invention are all technical terms that are already well-known in the technical field, so no further explanation will be given. In addition, the same reference numerals are used for the same components, but this does not affect and should not constitute an accurate understanding of the technical solution by those skilled in the art.

[0018] Embodiment 1:

[0019] The present invention provides a new type of upper crown pump plate structure, including an upper crown 1 (which can also be called an upper crown pump plate). A cylinder 5 is arranged inside the upper crown 1. A plurality of rib plates 2 are arranged between the upper crown 1 and the cylinder 5. Preferably, the upper crown 1 and the cylinder 5 are fixed by welding; the rib plates 2 are evenly arranged along the center of the upper crown 1; a detachable upper flat plate 3 is arranged on the upper parts of the rib plates 2 and the cylinder 5.

[0020] The upper flat plate 3 is detachably connected to the rib plate 2, and the upper flat plate 3 is detachably connected to the cylinder 5; the upper end surface of the upper crown 1 is above the upper end surface of the upper flat plate 3, that is, the sum of the height of the rib plate 2 and the height of the upper flat plate 3 is less than the height at both ends of the upper crown 1; the detachable connection method facilitates the cleaning of debris falling into the pump plate of the upper crown 1 during the machining process; the structure is simple and easy to operate, improving work efficiency and avoiding the defects of unsightly appearance and easy cracking at the weld.

[0021] As a preferred solution, the rib plate 2 and the cylinder 5 are connected to the upper flat plate 3 by screws 4; the connection method is screw connection, which has low cost, is easy to maintain and operate; more preferably, in order to improve the connection stability and stiffness, there are four screws between each rib plate 2 and the upper flat plate 3; however, it is not limited to 4 screws, and the specific number of screws is selected according to the specific structures of the rib plate 2 and the upper flat plate 3.

[0022] Embodiment 2:

[0023] In this embodiment, a counterweight cavity 6 is formed among the upper crown 1, the rib plate 2, the cylinder 5 and the upper flat plate 3, and a counterweight device is arranged in the counterweight cavity 6; the cooperation of the counterweight cavity 6 and the counterweight device can counterweight the equipment. Because of the detachable connection design, it is avoided that during the counterbalancing process, the upper crown 1 is cut, a counterweight device is added by welding, and then the cutting place is sealed and welded firmly; the present invention avoids this cumbersome process. During counterbalancing, only the upper flat plate 3 needs to be removed and the counterweight device is placed in the corresponding position, which is very simple and convenient, improving work efficiency.

[0024] As a preferred solution, in order to reduce the use cost and improve the versatility, the counterweight device adopts a counterweight lead block 7, and the counterweight lead block 7 is fixedly welded to the upper crown 1.

[0025] The present invention designs a new type of upper crown pump plate structure for the problems of difficult machining and cleaning and difficult counterweight of the original mixed-flow runner upper crown. The upper flat plate 3 is connected to the rib plate 2 and the cylinder 5 welded to the upper crown 1 by screws 4. After machining, only the upper flat plate 3 needs to be removed to remove the iron filings in the inner cavity of the runner upper crown 1; during counterbalancing, only the upper flat plate 3 needs to be removed and the counterweight device is placed in the corresponding position; finally, after the socket head cap screws 4 are cleaned, the upper flat plate 3 is fastened to the runner and "anaerobic thread locking sealant" is applied to complete the installation. The advantages and positive effects of the present invention are: greatly reducing the influence on the runner during the welding process, increasing the stiffness of the runner, being easy to disassemble and clean, making the counterbalancing process simpler, more convenient and having good repeatability.

[0026] For those skilled in the art, the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0027] As described above, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the technical solution of the present invention.

Claims

1. A novel upper crown pump plate structure, comprising an upper crown (1), Characterized in that, A cylinder (5) is arranged inside the upper crown (1), a rib plate (2) is arranged between the upper crown (1) and the cylinder (5), and a detachable upper flat plate (3) is arranged above the rib plate (2) and the cylinder (5); The rib plate (2) is connected to the upper flat plate (3) by screws (4), and the cylinder (5) is connected to the upper flat plate (3) by screws (4); A counterweight cavity (6) is formed among the upper crown (1), the rib plate (2), the upper flat plate (3) and the cylinder (5), and a counterweight device is arranged in the counterweight cavity (6).

2. The novel upper crown pump plate structure according to claim 1, Characterized in that, There are four screws between each rib plate (2) and the upper flat plate (3).

3. The novel upper crown pump plate structure according to claim 1, Characterized in that, The counterweight device is a counterweight lead block (7).

4. The novel upper crown pump plate structure according to claim 3, Characterized in that, The counterweight lead block (7) is fixedly welded to the upper crown (1).

5. The novel upper crown pump plate structure according to any one of claims 1 to 4, Characterized in that, The upper crown (1) is fixedly welded to the cylinder (5).

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