CN207093776U - A kind of anti-sand type inspection and maintenance sealing device for main shaft of hydraulic turbine - Google Patents

Abstract

The utility model relates to a sealing device especially relates to a sealing device is overhauld to sand prevention type of hydraulic turbine main shaft. The spindle comprises a spindle, the main shaft overcoat have the seal receptacle, the upper portion of seal receptacle be equipped with the seal that cup joints with the main shaft, the bottom of seal and seal receptacle between be equipped with the clamping ring that cup joints with the main shaft, clamping ring and seal receptacle between form sealed installation cavity, sealed installation cavity in be equipped with the sealed movable opening that is linked together with the main shaft, sealed installation cavity in be equipped with heart-shaped rubber ring, heart-shaped rubber ring and main shaft be movable crimping through sealed movable opening and seal. The sand-proof type maintenance sealing device for the main shaft of the water turbine has the advantages of compact structure, improved operation performance and relatively low use cost.

Description

A kind of anti-sand type inspection and maintenance sealing device for main shaft of hydraulic turbine

technical field

The utility model relates to a sealing device, in particular to a sand-proof type inspection and maintenance sealing device for the main shaft of a water turbine.

Background technique

When the water turbine unit is shut down for maintenance, the maintenance personnel must invest in the maintenance seal, otherwise the tail water backflow will flood the waterwheel room.

Chinese patent 201220752741.1 discloses a vertical water turbine main shaft inspection and sealing device, including a main shaft, a base, and an O-shaped rubber ring and a pressure ring on the base. This structure is relatively complex, and the adaptability is not high.

Utility model content

The utility model mainly solves the deficiencies in the prior art, and provides a structure with high compactness. Compressed air is filled on the outside of the heart-shaped rubber ring, and the inspection and sealing will be put into use to prevent the backflow of tail water. When the inspection is completed, the compressed air When it is released, the heart-shaped rubber ring automatically springs back to its original position, and the anti-sand stop effectively prevents sand from entering the inflation pipeline, and it is easy to assemble and disassemble the clogged pipeline.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions:

A sand-proof maintenance sealing device for the main shaft of a water turbine, including a main shaft, the main shaft is covered with a sealing seat, the upper part of the sealing seat is provided with a sealing body that is socketed with the main shaft, and the bottom of the sealing body is connected to the sealing seat There is a pressure ring that is socketed with the main shaft, and a seal installation cavity is formed between the pressure ring and the seal seat. The seal installation cavity is provided with a seal movable port that communicates with the main shaft. In the seal installation cavity There is a heart-shaped rubber ring, and the heart-shaped rubber ring and the main shaft are movable and crimped and sealed through the sealing movable port;

The upper and lower end surfaces of the inner wall of the sealed installation cavity are respectively provided with sand-proof openings that are crimped with the heart-shaped rubber ring. Triangular shape, the knuckles of the sealing movable opening are distributed in circular arcs.

Preferably, the pressure ring is half embedded in the sealing seat, the upper part of the pressure ring extends out of the upper part of the sealing seat, the sealing body is half embedded in the sealing seat, and the bottom of the sealing body is in contact with the sealing seat. A gap cavity is provided between the upper part of the ring, and the space between the pressure ring and the sealing seat, and between the sealing body and the sealing seat are respectively fastened by bolts.

Preferably, the space between the bottom of the pressing ring and the sealing seat, and between the bottom of the sealing body and the sealing seat are respectively sealed by sealing rings.

When installing, first fix the heart-shaped rubber ring to the sealing seat with a pressure ring, and then fasten the sealing body to the sealing seat with bolts. When the unit is running normally, the inspection seal is not put into use, and there is a certain gap between the heart-shaped rubber ring and the main shaft, which does not affect the operation of the unit; when the unit is shut down for inspection, the heart-shaped rubber ring will be compressed when the compressed air is filled. Deformation, maintenance seals are put into use, and the anti-sand stop can prevent sediment from entering and blocking the pipeline.

The utility model provides a sand-proof maintenance sealing device for a main shaft of a water turbine, which has a compact structure, improved operation performance and relatively low use cost.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a schematic structural diagram of part A in Fig. 1 during normal operation;

Fig. 3 is a schematic diagram of the structure of part A in Fig. 1 when it is shut down for maintenance.

Detailed ways

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment 1: As shown in Fig. 1, Fig. 2 and Fig. 3, a sand-proof maintenance sealing device for the main shaft of a hydraulic turbine includes a main shaft 1, the main shaft 1 is covered with a sealing seat 2, and the upper part of the sealing seat 2 There is a sealing body 3 socketed with the main shaft 1, a pressure ring 4 socketed with the main shaft 1 is provided between the bottom of the sealing body 3 and the sealing seat 2, and a seal is formed between the pressure ring 4 and the sealing seat 2 The installation chamber 5, the seal installation chamber 5 is provided with a seal movable port 6 connected with the main shaft 1, the seal installation chamber 5 is provided with a heart-shaped rubber ring 7, and the heart-shaped rubber ring 7 is connected to the main shaft 1 through the sealing movable port 6 to form a movable crimping seal;

The upper and lower end faces of the inner wall of the sealed installation chamber 5 are respectively provided with sand-proof mouths 8 that are crimped with the heart-shaped rubber ring 7. The sand-proof mouths 8 are protrudingly distributed, and the sand-proof mouthpieces The cross section of 8 is triangular, and the knuckles of the movable sealing port 6 are distributed in circular arcs.

The pressure ring 4 is half embedded in the sealing seat 2, the upper part of the pressure ring 4 extends out of the upper part of the sealing seat 2, the sealing body 3 is half embedded in the sealing seat 2, and the sealing body 3 A gap cavity 9 is provided between the bottom of the pressure ring 4 and the upper part of the pressure ring 4, and the space between the pressure ring 4 and the sealing seat 2, and between the sealing body 3 and the sealing seat 2 are respectively fastened by bolts 10.

The space between the bottom of the pressure ring 4 and the sealing seat 2 and between the bottom of the sealing body 3 and the sealing seat 2 are respectively sealed by the sealing ring 11 .

Claims (3)

1. A sand-proof maintenance sealing device for the main shaft of a hydraulic turbine, including the main shaft (1), characterized in that: the main shaft (1) is covered with a sealing seat (2), and the upper part of the sealing seat (2) is provided with The sealing body (3) socketed with the main shaft (1), the pressure ring (4) socketed with the main shaft (1) is provided between the bottom of the sealing body (3) and the sealing seat (2), and the A seal installation cavity (5) is formed between the pressure ring (4) and the seal seat (2), and the seal installation cavity (5) is provided with a seal movable port (6) connected with the main shaft (1). A heart-shaped apron (7) is provided in the sealing installation chamber (5), and the heart-shaped apron (7) and the main shaft (1) are movable and crimped and sealed through the sealing movable port (6); The upper and lower end surfaces of the inner wall of the sealed installation cavity (5) are respectively provided with anti-sand stoppers (8) which are pressed in contact with the heart-shaped rubber ring (7), and the above-mentioned sand-proof stoppers (8) are distributed in a protruding shape , the cross-section of the anti-sand stop opening (8) is triangular in shape, and the knuckles of the movable sealing opening (6) are distributed in circular arcs. 2. The sand-proof maintenance sealing device for the main shaft of a hydraulic turbine according to claim 1, characterized in that: the pressure ring (4) is half-embedded in the seal seat (2), and the pressure ring (4) The upper part of the sealing body (3) extends from the upper part of the sealing seat (2), the sealing body (3) is half embedded in the sealing seat (2), and the bottom of the sealing body (3) and the upper part of the pressing ring (4) are provided There is a gap cavity (9), and the space between the pressure ring (4) and the sealing seat (2), and between the sealing body (3) and the sealing seat (2) are respectively fastened by bolts (10). 3. A sand-proof maintenance sealing device for the main shaft of a water turbine according to claim 1 or 2, characterized in that: between the bottom of the pressure ring (4) and the sealing seat (2), and between the sealing body (3) The bottom and the sealing seat (2) are respectively sealed by sealing rings (11).