CN218207806U

CN218207806U - Runner blade sealing structure of Kaplan turbine

Info

Publication number: CN218207806U
Application number: CN202222648555.XU
Authority: CN
Inventors: 张如鹏; 龚进; 成禄泉; 吴李洪
Original assignee: Chongqing Water Turbine Works Co Ltd
Current assignee: Chongqing Water Turbine Works Co Ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2023-01-03
Anticipated expiration: 2032-10-08

Abstract

The utility model relates to an axial compressor Kaplan turbine runner technical field discloses a Kaplan turbine runner paddle seal structure, including runner body and paddle, the paddle top is the structure runner, be equipped with the oil pocket in the runner body, its characterized in that, be equipped with the mounting groove between paddle and the runner body, be equipped with the transition ring in the mounting groove, be equipped with the sealing washer between transition ring and the paddle, the sealing washer includes from last interior backing ring, last backing ring, X type backing ring, lower backing ring and the outer backing ring that sets up extremely down, and lubricating oil or water are not revealed from seal structure to little while of the change volume of old runner paddle structural transformation, and sealing performance is good.

Description

Runner blade sealing structure of Kaplan turbine

Technical Field

The utility model relates to an axial compressor Kaplan turbine runner technical field specifically is a Kaplan turbine runner paddle seal structure.

Background

The water turbine runner is used as a working component for converting water energy into rotating mechanical energy, and directly determines the working efficiency of the water turbine, such as the flow capacity, the hydraulic efficiency, the cavitation erosion, the stable operation and the like. The axial flow Kaplan turbine can change the angle of the runner blades according to the size of a water head, so that the turbine keeps the highest working efficiency. The reliable and durable sealing structure of the runner blade is one of key technologies of the Kaplan turbine, which is very important for the runner of the axial-flow Kaplan turbine. On one hand, the sealing structure of the rotating wheel blade can isolate the lubricating oil of the blade bearing and the operating mechanism in the rotating wheel body from the water on the flow channel side of the sealing structure, and no leakage is generated; on the other hand, the sealing structure of the runner blade is also convenient to install and maintain.

The traditional sealing structure of the runner blade comprises a runner body, blades, a spring and a sealing ring, wherein the runner body and the blades are connected through bolts, and the spring abuts against a herringbone backing ring and abuts against the sealing ring.

This prior art has the following disadvantages: at present, the structure of an old runner blade is transformed, the connecting sizes of different runners and blades are different, namely, a sealing structure and the condition that the runners and the blades cannot be matched exist, pressure on a plurality of local parts of the whole sealing contact ring surface is unbalanced, lubricating oil or water easily flows out from weak links of the lubricating oil or the water, and therefore the sealing performance is invalid, the sealing structure cannot be directly replaced, the structure of the old runner body needs to be directly changed, the change amount of the old runner body is large, the structure of the runner body is complex, the replacement period is long, and the old runner body is very inconvenient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a Kaplan turbine runner paddle seal structure to it is big that the high-efficient volume of change of solving old runner paddle institutional advancement solves lubricating oil or water and reveals the problem that makes the sealing performance inefficacy easily from seal structure simultaneously.

In order to achieve the above object, the utility model provides a Kaplan turbine runner paddle seal structure, including runner body and paddle, the paddle top is the structure runner, be equipped with the oil pocket in the runner body, its characterized in that, be equipped with the mounting groove between paddle and the runner body, be equipped with the transition ring in the mounting groove, be equipped with the sealing washer between transition ring and the paddle, the sealing washer includes from last interior backing ring, last backing ring, X type backing ring, lower backing ring and the outer backing ring that sets up extremely down.

In order to further adapt to installation grooves with different sizes and facilitate adjustment and installation, a plurality of upper backing rings and lower backing rings are arranged for coarse adjustment.

Preferably, the cross section of the transition ring is of an inverted T-shaped structure, a step is arranged on the runner hub, and the transition ring is matched with the step.

In order to facilitate the adjustment of the fit tightness of the sealing ring, a plurality of adjusting gaskets are arranged at the top and the bottom of the sealing ring, and the thickness of each adjusting gasket is a mm-level gasket for fine adjustment.

And the sealing performance is further improved, a sealing gland is arranged on the transition ring and covers the sealing ring and the transition ring.

In order to fix the sealing ring and improve the overall sealing performance, the sealing gland is connected to the transition ring through bolts.

The utility model discloses following beneficial effect has: the balance, stability and constancy of the pressure of the working medium water in the flow channel of the unit structure and the pressure of the oil in the runner body are utilized to balance the up-and-down stress of the sealing ring, and then the guide function of other functional parts is utilized to efficiently and simply realize the upgrading of the sealing performance; the traditional spring structure is changed into a multi-backing-ring-gasket structure of the sealing ring, the transition ring is added, the transformation is completed with the minimum workload, and under the condition that the structural size of the sealing ring is not changed, the size of the transition ring is only required to be adjusted to adapt to the rotating wheels and the blades with different models and sizes.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a partial structural schematic diagram.

Reference numerals: 1. a runner hub; 101. a step; 2. a paddle; 3. a structural flow channel; 4. an oil chamber; 5. mounting grooves; 6. a transition ring; 601. an inner ring; 602. an outer ring; 7. a seal ring; 701. an inner backing ring; 702. an upper backing ring; 703. an X-shaped backing ring; 704. a lower backing ring; 705. an outer backing ring; 8. Adjusting the gasket; 9. a sealing gland; 10. and (4) bolts.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the drawings, but the present invention is not limited to these embodiments, and the modifications made to the present invention are also within the scope of the claims of the present invention without departing from the principles of the present invention.

Example 1

As shown in fig. 1-2, a sealing structure for runner blades of a Kaplan turbine runner includes a runner body 1 and blades 2, a structural flow channel 3 is arranged above the blades 2, an oil cavity 4 is arranged in the runner body 1, an installation groove 5 is arranged between the blades 2 and the runner body 1, a transition ring 6 is arranged in the installation groove 5, a sealing ring 7 is arranged between the transition ring 6 and the blades 2, the sealing ring 7 includes an inner backing ring 701, an upper backing ring 702, an X-shaped backing ring 703, two lower backing rings 704 and an outer backing ring 705 which are arranged from top to bottom, the number of the upper backing ring 702 and the number of the lower backing rings 704 can be increased and decreased according to the size, the upper backing ring 702 is in a V shape, the lower backing ring 704 is in an inverted V shape, the inner backing ring 701 abuts against the upper backing ring 702 through upper water pressure, and the outer backing ring abuts against the lower backing ring 704 through lower oil pressure, so that integral multi-layer sealing is realized.

The transition ring 6 comprises an inner ring 601 and an outer ring 602, the cross section of the transition ring 6 is of an inverted T-shaped structure, a step 101 is arranged on the rotating wheel body 1, the outer ring 602 of the transition ring 6 is matched on the step 101, the inner ring 601 is matched under the step 101, and the outer backing ring 705, the two lower backing rings 704, the X-shaped backing ring 703, the upper backing ring 702 and the inner backing ring 701 are sequentially overlapped under the step 101 and are in contact with the inner wall of the inner ring 601 to realize sealing.

Sealing washer 7 top and bottom respectively are equipped with 2 adjusting shim 8, every the thickness of gasket is 5mm, according to mounting groove 5 carries out the fine tuning.

The transition ring 6 is provided with a sealing gland 9, the sealing gland 9 covers the sealing ring 7 and the transition ring 6, and the sealing gland 9 is connected to the transition ring 6 through a bolt 10.

To old runner and paddle 2 reform transform, tear its old seal structure open earlier to it is different according to its concrete size change diameter transition ring 6, sealing washer 7 with transition ring 6 cooperation is in between runner and the paddle 2, and the installation sealing gland 9, sealing washer 7 realizes balanced stable with the extrusion of oil pressure down at last water pressure, guarantees good leakproofness to accomplish with minimum work load and reform transform.

Claims

1. The utility model provides a Kaplan turbine runner paddle seal structure, includes runner body (1) and paddle (2), paddle (2) top is structure runner (3), be equipped with oil pocket (4), its characterized in that in runner body (1): be equipped with between paddle (2) and runner hub (1) mounting groove (5), be equipped with transition ring (6) in mounting groove (5), be equipped with between transition ring (6) and paddle (2) sealing washer (7), sealing washer (7) include from last interior backing ring (701), last backing ring (702), X type backing ring (703), lower backing ring (704) and outer backing ring (705) that set up down.

2. The Kaplan turbine runner blade seal structure of claim 1, wherein: a plurality of the upper and lower backing rings (702, 704) are provided.

3. The Kaplan turbine runner blade seal structure of claim 2, wherein: the cross section of the transition ring (6) is of an inverted T-shaped structure, a step (101) is arranged on the runner body (1), and the transition ring (6) is matched on the step (101).

4. The Kaplan turbine runner blade seal structure of claim 1, 2 or 3, wherein: and a plurality of adjusting gaskets (8) are arranged at the top and the bottom of the sealing ring (7).

5. The Kaplan turbine runner blade seal structure of claim 4, wherein: and a sealing gland (9) is arranged on the transition ring (6), and the sealing gland (9) covers the sealing ring (7) and the transition ring (6).

6. The Kaplan turbine runner blade seal structure of claim 5, wherein: the sealing gland (9) is connected to the transition ring (6) through bolts (10).