Sectional type sealing belt structure for guide vane end face of water turbine

Abstract

The invention discloses a water turbine guide vane end face sectional type sealing belt structure, belongs to the field of water turbines, and can reduce the water leakage amount of a guide vane. The guide vane end sealing belt is of a segmented structure, and when two adjacent guide vanes are located at the closed position, different segments of the sealing belt are pressed tightly, so that the sealing belt can adapt to different end face gaps of the two guide vanes under the elastic force action of the elastic compensation ring, the sealing belt is pressed tightly, the leakage stopping effect is achieved, and the water leakage amount of the guide vanes is reduced.

Description

Technical Field

[0001] The invention relates to the field of water turbines, and in particular to a segmented sealing belt structure of a water turbine guide vane end surface. Background Art

[0002] Conventional turbines generally have end face sealing devices for the guide vanes, which are used to prevent water leakage between the end face of the guide vane body and the top cover and bottom ring when the movable guide vane is in the fully closed position. At present, the guide vane end face sealing belt between every two guide vanes of the turbine is an integral structure. Affected by manufacturing and installation deviations, the end face gaps of two adjacent guide vanes may be different. When the guide vane is in the closed position, the guide vane with a smaller end face gap will compress the sealing belt, while the guide vane with a larger end face gap will not be able to contact the sealing belt, resulting in a loose fit with the end face of the guide vane body, and the sealing effect cannot be achieved, resulting in large leakage, cavitation and erosion of sediment and water flow, resulting in a shortened service life. Summary of the invention

[0003] The purpose of the present invention is to provide a segmented sealing belt structure for the end face of a water turbine guide vane, which can adapt to the situation that two guide vanes have different end face gaps and reduce the amount of water leakage from the guide vanes. The purpose of the present invention is achieved through the following technical scheme: a segmented sealing belt structure for the end face of a water turbine guide vane, the sealing belt and the elastic compensation ring are fixed in the base groove of the top cover or the bottom ring by a pressure plate, the elastic compensation ring is installed at the bottom of the base groove, the sealing belt is installed on the upper part of the elastic compensation ring, the outer fixed pressure plate is fixed to the bottom of the base groove by bolts, the outer fixed pressure plate presses the outer wing of the sealing belt, the inner fixed pressure plate is fixed to the bottom of the base groove by bolts, the inner fixed pressure plate presses the inner wing of the sealing belt, the lower surface of the sealing belt contacts and presses with the elastic compensation ring, the upper surface of the sealing belt contacts with the plane of the end of the movable guide vane, forming a sealing pair, and sealing the water passage gap L.

[0004] As a preferred embodiment, the sealing belt is a segmented structure, including a first sealing belt segment and a second sealing belt segment. The first sealing belt segment and the second sealing belt segment are tightly attached to each other at the sealing belt joint and can slide up and down relatively. When the water guiding mechanism of the turbine is closed, the end faces of the petal bodies of the adjacent first movable guide vanes and the second movable guide vanes respectively press the protruding surfaces of the flow channels of the first sealing belt segment and the second sealing belt segment of the sealing belt.

[0005] Compared with the prior art, the present invention has the following advantages:

[0006] 1. The present invention only optimizes the sealing belt and does not involve other components; thus the production cycle is greatly shortened.

[0007] 2. The present invention is easy to promote and has strong versatility.

[0008] 3. The present invention reduces the water leakage of the guide vane and improves the quality stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a longitudinal section structural diagram of the turbine guide vane end face seal of the present invention.

[0010] Figure 2 This is a cross-sectional structural diagram of the turbine guide vane end face seal of the present invention.

[0011] Figure 3 It is a planar structural diagram of the turbine guide vane end face seal of the present invention.

[0012] Figure 4 It is a cross-sectional view of the parts of the segmented sealing belt of the turbine guide vane end face of the present invention.

[0013] Figure 5 It is a plan view of the parts of the segmented sealing belt of the turbine guide vane end face of the present invention.

[0014] Markings in the figure: 1-outer fixed pressure plate; 2-bolt; 3-elastic compensation ring; 4-sealing belt; 5-inner fixed pressure plate; 6-water channel gap L; 7-movable guide vane; 8-base groove; 401-first section of sealing belt; 402-second section of sealing belt; 403-sealing belt joint; 701 first movable guide vane; 702-second movable guide vane. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, the present invention is a segmented sealing belt structure of the guide vane end face of a turbine, a base groove 8 is provided, an elastic compensation ring 3 is installed at the bottom of the base groove 8, a sealing belt 4 is arranged on the upper part of the elastic compensation ring 3, an outer fixed pressure plate 1 is fixed in the base groove 8 by bolts 2, and the outer fixed pressure plate 1 presses the outer wing of the sealing belt 4.

[0017] The inner fixed pressure plate 5 is fixed in the base groove 8 by bolts 2, and the inner fixed pressure plate 5 presses the inner wing of the sealing belt 4, the lower plane of the sealing belt 4 contacts and presses with the elastic compensation ring 3, and the upper surface of the sealing belt 4 protrudes and contacts with the plane of the end of the petal body of the movable guide vane 7 to form a sealing pair, thereby sealing the water passage gap L6. The present invention has a simple structure, and the sealing belt 4 is lifted up by the elastic compensation ring 3, and the upper surface of the sealing belt 4 protrudes. When the movable guide vane 7 is closed, the end surface of the petal body and the surface of the sealing belt 4 are pressed and fitted to play a sealing role, thereby reducing the water leakage of the turbine when the guide vane is closed.

[0018] like Figure 2 to Figure 5 As shown, the sealing belt 4 is designed as a segmented structure, and when the adjacent first movable guide vane 701 and the second movable guide vane 702 are in the closed position, the first segment 401 and the second segment 402 of the sealing belt are respectively pressed. Under the elastic force of the elastic compensation ring 3, the sealing belt 4 can adapt to the different end surface gaps of the first movable guide vane 701 and the second movable guide vane 702, respectively, and each is pressed and squeezed to fit to play a sealing role, which is conducive to reducing cavitation and erosion, increasing service life, and simple and convenient operation.

[0019] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it should be clear to those skilled in the art that the technical solutions described in the above embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A segmented sealing belt structure for the end face of a turbine guide vane, characterized in that: The sealing belt (4) and the elastic compensation ring (3) are fixed in the base groove (8) of the top cover or the bottom ring by a pressure plate, the elastic compensation ring (3) is installed at the bottom of the base groove (8), the sealing belt (4) is installed on the upper part of the elastic compensation ring (3), the outer fixed pressure plate (1) is fixed to the bottom of the base groove (8) by bolts (2), the outer fixed pressure plate (1) presses the outer wing of the sealing belt (4), the inner fixed pressure plate (5) is fixed to the bottom of the base groove (8) by bolts (2), the inner fixed pressure plate (5) presses the inner wing of the sealing belt (4), the lower surface of the sealing belt (4) is in contact and pressed with the elastic compensation ring (3), and the upper surface of the sealing belt (4) is in contact with the end plane of the movable guide vane (7), forming a sealing pair to seal the water passage gap L (6).

2. The segmented sealing strip structure of the guide vane end face of a water turbine according to claim 1 is characterized in that: The sealing belt (4) is a segmented structure, comprising a first sealing belt segment (401) and a second sealing belt segment (402); the first sealing belt segment (401) and the second sealing belt segment (402) are tightly attached to each other at a sealing belt joint (403) and can slide up and down relatively; when the water turbine water guide mechanism is closed, the petal end surfaces of the adjacent first movable guide vanes (701) and second movable guide vanes (702) respectively press against the protruding surfaces of the flow channels of the first sealing belt segment (401) and the second sealing belt segment (402) of the sealing belt (4).

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