Adjustable structure for end face clearance of medium and small vertical water turbines

Abstract

The present invention relates to the technical field of hydro-generating unit sets, and particularly to an adjustable structure for the end face clearance of a medium and small-sized vertical water turbine, which includes a coupling bolt, a coupling nut, a flat washer, and a fine-thread adjusting sleeve. One end of the fine-thread adjusting sleeve is provided with a fine-thread clamping plate that can be adjusted. By rotating the fine-thread clamping plate with a wrench, the height can be adjusted on the top cover. When the end face clearance between the guide vane and the top cover and the bottom ring increases, the relative position of the steel sleeve and the top cover is adjusted to compensate for the end face clearance, thereby reducing the end face clearance of the water guide mechanism and reducing the water leakage at the end face. At the same time, in the design of the parts, due to the adjustable clearance, the machining accuracy of each part in the dimension chain is reduced, thus having the advantages of reducing production costs and convenient adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of hydro-generating units, and particularly to an adjustable structure for the end face clearance of a medium and small vertical water turbine. Background Technique

[0002] The traditional fastening is simply bolt connection. The end face clearance of the guide vane is ensured through machining dimension chains and after assembly, and it is not adjustable. During the long-term operation of the unit or in a power station with a large amount of sediment, it is prone to wear. The end face clearance between the guide vane and the top cover and the bottom ring will increase. After the clearance becomes large, even when the guide vane is fully closed, the leakage water volume will still cause the runner to rotate, affecting the stability of the unit, as Figure 3 shown. In addition, in the reformed unit, since the embedded part of the unit cannot be replaced, a new structure is more needed for adjustment, compensation, and improvement.

[0003] Therefore, an adjustable structure for the end face clearance of a medium and small vertical water turbine that can solve the above problems is needed. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide an adjustable structure for the end face clearance of a medium and small vertical water turbine. The new structure considers that the end face clearance can be adjusted after running for a period of time. In the design of parts, due to the adjustable clearance, the machining accuracy of each part in the dimension chain is reduced, thus having the advantages of reducing production costs and convenient adjustment.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an adjustable structure for the end face clearance of a medium and small vertical water turbine, including an adjustment mechanism. The adjustment mechanism is arranged between the top cover and the stay ring. The adjustment mechanism includes a fastening bolt, a fastening nut, and a fine-thread adjustment sleeve. One end of the top cover is provided with a fine-thread internal thread that is threadedly connected to the fine-thread adjustment sleeve. The top cover and the stay ring are threadedly connected to each other through the fastening bolt. One end of the fine-thread adjustment sleeve is provided with a fine-thread clamping plate that can be adjusted.

[0006] Further, one end of the fine-thread adjustment sleeve is provided with a fine-thread clamping plate that can be adjusted. The fine-thread clamping plate is in a half-moon shape, and two are symmetrically arranged on the left and right.

[0007] Further, the inside of the fine-thread adjustment sleeve is a smooth plane.

[0008] Further, a flat washer is provided between the fastening nut and the top cover.

[0009] The advantages of the present invention are as follows: The present invention provides an adjustable structure for the end face clearance of a medium and small vertical water turbine, including an adjustment mechanism. The adjustment mechanism consists of a fastening bolt, a fastening nut, a flat washer, and a fine-thread adjustment sleeve. One end of the top cover is provided with a fine-thread internal thread that is threadedly connected to the fine-thread adjustment sleeve, and they are threadedly connected to each other with the fastening bolt. One end of the fine-thread adjustment sleeve is provided with an adjustable fine-thread clamping plate. By rotating the fine-thread clamping plate with a wrench, the height can be adjusted on the top cover. When the end face clearance between the guide vane and the top cover and the bottom ring increases, the relative position of the adjusting steel sleeve and the top cover is adjusted to compensate for the end face clearance, thereby reducing the end face clearance of the guide water mechanism and reducing the water leakage at the end face. At the same time, in the part design, due to the adjustable clearance, the machining accuracy of each part in the dimension chain is reduced, thus having the advantages of reducing production costs and convenient adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 is a schematic installation diagram of the three-dimensional structure of the present invention;

[0012] Figure 2 is a schematic diagram of the fine-thread adjustment sleeve of the present invention;

[0013] Figure 3 is a schematic diagram of the prior art structure;

[0014] Wherein:

[0015] 1. Adjustment mechanism; 2. Fastening bolt; 3. Fastening nut;

[0016] 4. Flat washer; 5. Fine-thread adjustment sleeve; 6. Adjustment clearance;

[0017] 7. Stay ring; 8. Top cover; 9. Guide vane rod;

[0018] 10. Guide vane body; 11. Top cover wear-resistant plate; 12. Upper end face of the guide vane body;

[0019] 13. Upper sealing ring; 14. Guide vane end face clearance; 15. Fine-thread internal thread;

[0020] 16. Fine-thread clamping plate; 17. Sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure installation of the present invention. Figure 2 It is a schematic diagram of the fine-thread adjusting sleeve of the present invention. As Figure 2 shown, one end of the fine-thread adjusting sleeve 5 has a fine-thread clamping plate 16. By using a wrench to screw the fine-thread clamping plate 16, the height of the top cover 8 can be adjusted, and thus the adjustment gap 6 can be changed. By changing the adjustment gap 6, the guide vane end face gap 14 can be indirectly changed. The guide vane end face gap 14 is essential for the unit. The guide vane end face gap 14 refers to the gap between the top cover anti-template 11 and the upper end face 12 of the guide vane body. After adjusting the gap, the fastening bolts 2, flat washers 4, and the top cover 8 are connected together through the fastening nuts 3.

[0025] Working mode: The present invention provides a structure with adjustable end face clearance for medium and small vertical water turbines. When the present invention is in use, first screw the fine-thread adjusting sleeve 5 into the fine-thread internal thread 15 of the top cover 8, with one end of the fine-thread clamping plate 16 facing outwards. Adjust the distance between the stay ring 7 and the top cover 8 by screwing the fine-thread clamping plate 16 on the fine-thread adjusting sleeve 5 with a wrench to form an adjustment clearance 6. Since there is also a space between the top cover 8 and the guide vane body 10, and this space is the necessary guide vane end face clearance 14 of the unit, and this clearance is indirectly changed by changing the adjustment clearance 6. When the clearance is adjusted to the appropriate position, one end of the fastening bolt 2 can be screwed into the stay ring 7 through the fine-thread adjusting sleeve 5. The other end of the fastening bolt 2 sleeved with the flat washer 4, and finally tighten the fastening nut 3 to complete the installation. After the unit has worked for a period of time, the guide vane end face clearance 14 will change accordingly. At this time, the fastening nut 3 can be loosened, the flat washer 4 can be removed, and the fine-thread clamping plate 16 on the fine-thread adjusting sleeve 5 can be screwed with a wrench to change the distance between the stay ring 7 and the top cover 8, thereby indirectly adjusting the guide vane end face clearance 14. After the adjustment is completed, the flat washer 4 and the fastening nut 3 are restored, and the unit can continue to operate stably. Because of the adjustable clearance 6 in the present invention, the machining accuracy of each part in the dimension chain is reduced, thus having the advantages of reducing production costs and convenient adjustment.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Adjustable structure for the end face clearance of medium and small vertical water turbines, including an adjustment mechanism (1), the adjustment mechanism is arranged between the top cover (8) and the stay ring (7), Characterized in that: The adjustment mechanism (1) includes a bolt (2), a nut (3), and a fine-thread adjusting sleeve (5). One end of the top cover (8) is provided with a fine-thread internal thread (15) threadedly connected to the fine-thread adjusting sleeve (5). The top cover (8) and the stay ring (7) are threadedly connected to each other through the bolt (2). One end of the fine-thread adjusting sleeve (5) is provided with an adjustable fine-thread clamping plate (16); One end of the fine-thread adjusting sleeve (5) is provided with an adjustable fine-thread clamping plate (16). The fine-thread clamping plate (16) is in a semi-circular shape, and two are symmetrically arranged on the left and right; A flat washer (4) is arranged between the nut (3) and the top cover (8).

2. The adjustable structure for the end face clearance of medium and small vertical water turbines according to claim 1, Characterized in that: The inside of the fine-thread adjusting sleeve (5) is a smooth plane.

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