CN210003440U

CN210003440U - Water turbine guide vane journal end face sealing structure

Info

Publication number: CN210003440U
Application number: CN201920682455.4U
Authority: CN
Inventors: 秦波; 周康宁; 卿华恩
Original assignee: Chongqing Water Turbine Works Co Ltd
Current assignee: Chongqing Water Turbine Works Co Ltd
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-01-31
Anticipated expiration: 2029-05-14

Abstract

The utility model provides a hydraulic turbine stator journal end face seal structure, including main shaft and axle sleeve, the axle sleeve is provided with the top cap outward, the top cap below is provided with the stator, be provided with seal structure between axle sleeve and the stator, seal structure includes the sealing ring, be provided with the ladder annular on the sealing ring, be provided with spring and rubber seal in the ladder annular, rubber seal upper end coupling spring, lower extreme butt stator up end, realize the no clearance fit of rubber seal and stator up end through the rubber seal of spring roof pressure, the sealing ring upper end is provided with second rubber seal, realize the no clearance fit of sealing ring and stator up end through the pretension compression elasticity roof pressure sealing ring of second rubber seal, the utility model discloses a rubber seal, the elasticity that second rubber seal and spring pretension compression volume produced compresses tightly the sealing ring at the stator up end jointly and seals, and is effectual, and is good at the stability of operation in-process sealing ring.

Description

Water turbine guide vane journal end face sealing structure

Technical Field

The utility model relates to a francis turbine, concretely relates to water turbine stator journal end face seal structure.

Background

Based on the above, CN205225566U discloses a self-compensating type water turbine guide vane journal end face sealing device, which comprises five parts, namely a top cover, an oil-resistant rubber sealing ring, a guide vane and a bottom ring, wherein the oil-resistant rubber sealing ring and the sealing ring are both arranged between the top cover and each guide vane shaft hole, the sealing ring is respectively positioned between the top cover and the bottom ring by outer circle clearance fit, and the oil-resistant rubber sealing ring is arranged at an axial contact surface between each sealing ring and the top cover and the bottom ring.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an kind of hydraulic turbine stator journal end face seal structure, the sealing ring wearing and tearing volume of this structure still can seal when great.

In order to achieve the above purpose, the present invention adopts the following technical solution.

The end face sealing structure of the guide vane shaft neck of the water turbine comprises a main shaft, a shaft sleeve sleeved on the main shaft, a top cover is arranged outside the shaft sleeve in a matched mode, a guide vane is arranged below the top cover, and a sealing structure is arranged between the shaft sleeve and the guide vane, wherein the sealing structure comprises a sealing ring, a step ring groove is formed in the sealing ring, a spring and an -th rubber sealing ring are arranged in the step ring groove, the upper end of a -th rubber sealing ring is connected with the spring, the lower end of a -th rubber sealing ring is abutted to the upper end face of the guide vane, the -th rubber sealing ring is pressed through the spring to achieve gapless matching of the -th rubber sealing ring and the upper end face of the guide vane, a.

, an annular groove is arranged on the inner wall of the sealing ring, and a third rubber sealing ring is arranged in the annular groove.

Preferably, springs are provided at intervals of 30 ° or 45 ° along the circumferential direction of the seal ring.

Preferably, the resettable amount of the spring is 3-10mm, and the resettable amount of the spring according to the present invention should be understood as the amount of compression when the spring is compressed and can completely return to the free state, for example, when the spring is compressed for a long time by 10mm, the spring can still completely return to the free state.

Preferably, an annular plate is arranged at the upper end of the rubber sealing ring, and the annular plate can slide up and down along the stepped ring groove.

Preferably, the sealing ring of the present invention is a copper ring.

Adopt the utility model discloses, even the wearing and tearing volume of sealing ring surpasss 3mm and also can realize the good sealed of hydraulic turbine stator journal terminal surface, the utility model discloses a rubber seal, second rubber seal and the elasticity that the spring pretension volume of compression produced compress tightly the sealing ring at stator up end jointly and seal, cooperate rubber seal from the three side of sealing ring to seal simultaneously, and sealed effectual, and the stability of sealing ring is good in the operation process.

Drawings

FIG. 1 is a schematic view of the sealing structure of the end face of the guide vane journal of the water turbine of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is an enlarged view of a portion B in fig. 2.

Detailed Description

The present invention is described in with reference to the accompanying drawings and the embodiments, but the following description of the embodiments is only for the purpose of helping understanding the principle and the core idea of the present invention, and is not intended to limit the scope of the present invention.

Example 1

A sealing structure for the end face of a water turbine guide vane shaft neck comprises a main shaft 1 and a shaft sleeve 2 sleeved on the main shaft 1, a top cover 3 is arranged outside the shaft sleeve 2 in a matched mode, a guide vane 4 is arranged below the top cover 3, and a sealing structure is arranged between the shaft sleeve 2 and the guide vane 4, wherein the sealing structure comprises a sealing ring 6, a stepped annular groove 11 is formed in the sealing ring 6, a spring 7 and a -th rubber sealing ring 5 are arranged in the stepped annular groove 11, the upper end of the -th rubber sealing ring 5 is connected with the spring 7, the lower end of the -th rubber sealing ring 5 abuts against the upper end face of the guide vane 4, the spring 7 presses the -th rubber sealing ring 5 to achieve gapless matching of the rubber sealing ring 5 and the upper end face of the guide vane 4, the upper end of the sealing ring 6 is provided with a second rubber sealing ring 10, and the sealing ring.

Wherein, the inner wall of the sealing ring 6 is provided with a ring groove 8, and a third rubber sealing ring 9 is arranged in the ring groove 8.

springs 7 are arranged at intervals of 45 degrees along the circumferential direction of the sealing ring 6, eight springs 7 are arranged along the circumference of the sealing ring 6, the resettable amount of the springs 7 is 3-10mm, when the resettable amount of the springs 7 is 3mm, the minimum abrasion amount of the sealing ring 6 is 3mm, and when the resettable amount of the springs 7 is 10mm, the minimum abrasion amount of the sealing ring 6 is 10 mm.

Wherein, be provided with on rubber seal 5 upper end with annular plate 12, and annular plate 12 can slide from top to bottom along ladder ring groove 11, spring 7 upper end butt ladder ring groove 11 top, spring 7 lower extreme butt joint annular plate 12.

Wherein, the sealing ring 6 is a copper ring.

Example 2

springs 7 are arranged at intervals of 30 degrees along the circumferential direction of the sealing ring 6, twelve springs 7 are arranged along the circumference of the sealing ring 6, the resettable amount of the springs 7 is 3-10mm, when the resettable amount of the springs 7 is 3mm, the minimum abrasion amount of the sealing ring 6 is 3mm, and when the resettable amount of the springs 7 is 10mm, the minimum abrasion amount of the sealing ring 6 is 10 mm.

Wherein, the sealing ring 6 is a copper ring.

Wherein, the upper step part of the step ring groove 11 is used for accommodating the spring 7, the annular plate 12 and the th rubber sealing ring 5, and the lower step part of the step ring groove 11 is used for installing a cover plate, so that the spring 7 and the th rubber sealing ring 5 are pre-pressed in the step ring groove 11 before use, and the cover plate is removed when the sealing ring 6 is installed.

In the using process, silt carried in water flow can gradually abrade the lower end face of the sealing ring 6, because of the rubber sealing ring 5, the second rubber sealing ring 10 and the spring 7, when the abrasion loss of the sealing ring 6 is smaller than 3mm, the sealing ring 6 and the rubber sealing ring 5 can be tightly pressed on the upper end face of the guide vane 4 only through the elastic force generated by the pre-tightening compression amount of the second rubber sealing ring 10 to realize sealing, along with the increase of the abrasion loss of the sealing ring 6, the elastic force generated by the pre-tightening compression amount of the second rubber sealing ring 10 is not enough to tightly press the sealing ring 6, at the moment, the th rubber sealing ring 5 needs to be tightly pressed on the upper end face of the guide vane 4 through the elastic force generated by the spring 7, in addition, the annular groove 8 is arranged on the inner wall of the sealing ring 6, the third rubber sealing ring 9 is arranged.

Claims

1. The end face sealing structure of the guide vane journal of the water turbine comprises a main shaft (1) and a shaft sleeve (2) sleeved on the main shaft (1), wherein a top cover (3) is arranged outside the shaft sleeve (2) in a matched mode, a guide vane (4) is arranged below the top cover (3), and a sealing structure is arranged between the shaft sleeve (2) and the guide vane (4).

2. The turbine gate journal end face seal structure of claim 1, characterized in that: the inner wall of the sealing ring (6) is provided with an annular groove (8), and a third rubber sealing ring (9) is arranged in the annular groove (8).

3. The end face sealing structure of the water turbine guide vane journal according to claim 2, characterized in that springs (7) are provided every 30 ° or 45 ° along the circumferential direction of the sealing ring (6).

4. The turbine runner journal end face seal structure of claim 3, characterized in that: the resettable amount of the spring (7) is 3-10 mm.

5. The end face sealing structure of the journal of the water turbine guide vane as claimed in of claim 1-4, wherein an annular plate (12) is provided at the upper end of the rubber sealing ring (5), and the annular plate (12) can slide up and down along the stepped ring groove (11).

6. The turbine runner journal end face seal structure of claim 5, characterized in that: the sealing ring (6) is a copper ring.