A sealing method for a water pump turbine

Abstract

A sealing method for a water pump turbine includes the following steps: a. Installing a sealed bearing, consisting of an inner ring and an outer ring, onto the turbine main shaft; b. Machining an annular groove on the turbine main shaft, fixing a horn-shaped sealing cover within the annular groove with the open end of the horn-shaped sealing cover facing upwards, fixing a retaining ring to the inner ring of the sealed bearing, and fixing the bottom of the horn-shaped sealing cover to the retaining ring; fixing an inner ring comb-shaped sealing ring to the inner ring of the sealed bearing; c. Fixing a bearing housing to the outer ring of the sealed bearing, installing an outer ring comb-shaped sealing ring corresponding to the inner ring comb-shaped sealing ring in the middle of the bearing housing, and interlocking the inner and outer ring comb-shaped sealing rings to form a loop-shaped sealing structure to achieve sealing; d. The bottom of the bearing housing is an L-shaped return water ring, with the edge of the retaining ring inserted into the L-shaped return water ring, and a drain hole is opened at the bottom of the bearing housing, the height of which is lower than the top of the L-shaped return water ring.

Description

Technical Field

[0001] This invention belongs to the field of water turbine sealing technology in water conservancy engineering, specifically relating to a sealing method for the main shaft of a water turbine, which has a significant sealing effect. Background Technology

[0002] A water turbine is a power machine that converts the energy of flowing water into rotational mechanical energy; it belongs to the category of turbine machinery within fluid machinery. As early as around 100 BC, a rudimentary form of water turbine—the waterwheel—appeared in China, used for irrigation and driving grain processing equipment. Modern water turbines are mostly installed in hydroelectric power stations to drive generators. In a hydroelectric power station, water from the upstream reservoir is drawn through a water pipe to the water turbine, driving the turbine runner to rotate and power the generator. The water that has performed its work is then discharged downstream through a tailrace pipe. The higher the water head and the greater the flow rate, the greater the output power of the water turbine.

[0003] The turbine runner main shaft has one end near the water and the other end far from the water, with the generator installed at the far end. A small amount of water leakage can occur on the turbine runner main shaft. This leakage can enter the generator pit along the gap between the main shaft and the casing, hindering the normal operation of the generator equipment. Therefore, a sealing device must be installed on the main shaft.

[0004] Therefore, the sealing effect of the turbine main shaft is of paramount importance. Currently, turbine main shaft sealing devices typically use packing, but over time, this sealing effect deteriorates, allowing water to leak to the far end of the turbine main shaft and subsequently into the generator system, affecting the operation of the entire unit. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing method for a water pump turbine. This method can install multiple sealing structures between the main shaft, the inner ring of the sealing bearing, and the outer ring of the sealing bearing. Through this multiple sealing method, the sealing performance of the turbine main shaft is greatly improved, ensuring the normal operation of the generator set.

[0006] To achieve the above objectives, the sealing method for the water pump turbine of the present invention adopts the following technical solution:

[0007] A sealing method for a water pump turbine includes the following steps:

[0008] a. Install the sealed bearing on the main shaft of the turbine. The sealed bearing consists of an inner ring and an outer ring.

[0009] b. The rotating components of the turbine main shaft include the turbine main shaft and the inner ring of the sealed bearing. The rotating components of the turbine main shaft are machined, specifically by machining an annular groove on the turbine main shaft, fixing a horn-shaped sealing cover in the annular groove with the opening end of the horn-shaped sealing cover facing upward, fixing a retaining ring on the inner ring of the sealed bearing, fixing the horn-shaped sealing cover to the bottom of the retaining ring, and fixing an inner ring comb-shaped sealing ring on the inner ring of the sealed bearing at the top of the retaining ring.

[0010] c. A bearing housing is fixedly installed outside the outer ring of the sealed bearing. The bearing housing is provided with mounting holes for mounting bolts. An outer ring comb-shaped sealing ring corresponding to the inner ring comb-shaped sealing ring is installed in the middle of the bearing housing. The inner ring comb-shaped sealing ring and the outer ring comb-shaped sealing ring are connected to each other by a snap-fit, thereby forming a loop-shaped sealing structure to achieve the purpose of sealing.

[0011] d. The bottom of the bearing housing is an L-shaped return water ring, and the edge of the retaining ring is inserted into the L-shaped return water ring. A drain hole is opened at the bottom of the bearing housing, and the height of the drain hole is lower than the top of the L-shaped return water ring.

[0012] In the above-mentioned sealing method for water pump turbines, in step b, the top of the horn-shaped sealing cover is integrally connected to a vertical pipe, and the top of the vertical pipe is fixedly connected to a retaining ring.

[0013] In the above-mentioned sealing method for water pump turbines, in step b, a water-blocking groove is provided on the outer surface of the horn-shaped sealing cover. The water-blocking groove is spirally arranged, and the direction of its spiral is opposite to the rotation direction of the water turbine.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects:

[0015] The sealing method for the water pump turbine described in this invention firstly involves the cooperation of a trumpet-shaped sealing cover on the main shaft and an L-shaped return water outlet at the bottom of the bearing housing to guide leaked water through the drain hole, achieving a primary seal. Secondly, a comb-shaped sealing ring between the outer and inner rings of the sealing bearing forms a loop-shaped sealing structure, achieving a secondary seal. These two seals significantly improve the sealing performance of the turbine main shaft, ensuring the stability of the generator unit's operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a view from direction A of the horn-shaped sealing cover in Figure 1. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0019] A sealing method for a water pump turbine includes the following steps: Figure 1 and Figure 2 As shown,

[0020] a. Install the sealed bearing on the turbine main shaft 10. The sealed bearing consists of an inner ring 2 and an outer ring 1.

[0021] b. The rotating components of the turbine main shaft include the turbine main shaft and the inner ring 2 of the sealing bearing. The rotating components of the turbine main shaft are machined, specifically by machining an annular groove on the turbine main shaft, fixing the horn-shaped sealing cover 9 in the annular groove with the opening end of the horn-shaped sealing cover facing upwards, fixing the retaining ring 6 on the inner ring of the sealing bearing, and fixing the bottom of the horn-shaped sealing cover to the retaining ring. The inner ring comb-shaped sealing ring 4 is fixedly installed on the inner ring of the sealing bearing at the top of the retaining ring. The rotating water flows through the guide vanes of the turbine main shaft, and part of it seeps into the horn-shaped sealing cover. Since the upper opening of the horn-shaped sealing cover is larger than the lower opening, under the action of the water's own gravity, most of it will automatically flow down the horn-shaped sealing cover to the guide vanes.

[0022] c. A bearing housing 3 is fixedly installed on the outside of the outer ring 1 of the sealed bearing. The bearing housing is provided with mounting holes for mounting bolts. An outer ring comb-shaped sealing ring 5 corresponding to the inner ring comb-shaped sealing ring is installed in the middle of the bearing housing. The inner ring comb-shaped sealing ring and the outer ring comb-shaped sealing ring are connected to each other by a snap-fit, thereby forming a loop-shaped sealing structure to achieve the purpose of sealing.

[0023] d. The bottom of the bearing housing is an L-shaped return water ring 8. The edge of the retaining ring is inserted into the L-shaped return water ring. A drain hole 12 is opened at the bottom of the bearing housing. The height of the drain hole is lower than the top of the L-shaped return water ring. After step a, the rotating water flows through the guide vanes of the turbine main shaft. Part of it seeps into the trumpet-shaped sealing cover. Since the upper opening of the trumpet-shaped sealing cover is larger than the lower opening, under the action of the water flow's own gravity, most of it will automatically flow downward along the trumpet-shaped sealing cover. A small part continues to flow upward through the retaining ring and then reaches the L-shaped return water ring, and then is discharged through the drain pipe.

[0024] In the sealing method of the water pump turbine of the present invention, in step b, the top of the horn-shaped sealing cover is integrally connected with a vertical pipe 7, and the top of the vertical pipe is fixedly connected to a retaining ring.

[0025] In the sealing method of the water pump turbine of the present invention, in step b, a water blocking groove 11 is provided on the outer surface of the horn-shaped sealing cover. The water blocking groove is spirally arranged, and its spiral direction is opposite to the rotation direction of the water turbine. In this way, when the seeping water with vortex flows through the spirally shaped water blocking groove in the opposite direction, the water is blocked from continuing to flow upward.

[0026] The working principle of this invention is as follows:

[0027] The horn-shaped sealing cover on the turbine main shaft has a larger opening at the top than at the bottom. As the rotating water flows through the guide vanes of the turbine main shaft, some of it seeps onto the horn-shaped sealing cover. Under the influence of gravity, most of the water flows automatically downwards along the horn-shaped sealing cover to the guide vanes. Some of it continues upwards through the retaining ring and then reaches the L-shaped return water ring, and is then discharged through the drain pipe. A very small portion passes through the gap between the retaining ring and the outer comb-shaped sealing ring to reach the loop-shaped sealing structure formed by the inner and outer comb-shaped sealing rings, thus improving the sealing performance.

[0028] The sealing method for the water pump turbine described in this invention firstly involves the cooperation of a trumpet-shaped sealing cover on the main shaft and an L-shaped return water outlet at the bottom of the bearing housing to guide leaked water through the drain hole, achieving a primary seal. Secondly, a comb-shaped sealing ring between the outer and inner rings of the sealing bearing forms a loop-shaped sealing structure, achieving a secondary seal. This two-stage sealing significantly improves the sealing performance of the turbine main shaft, ensuring the stability of the generator unit's operation.

[0029] Although embodiments of the present invention have been shown and described, the above descriptions are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A sealing method for a water pump turbine, characterized in that, Includes the following steps: a. Install the sealed bearing on the turbine main shaft (10). The sealed bearing consists of an inner ring (2) and an outer ring (1). b. The rotating parts of the turbine main shaft include the turbine main shaft and the inner ring of the sealing bearing. The rotating parts of the turbine main shaft are machined, specifically, an annular groove is machined on the turbine main shaft, and a horn-shaped sealing cover (9) is fixed in the annular groove with the opening end of the horn-shaped sealing cover facing upward. A retaining ring (6) is fixedly installed on the inner ring of the sealing bearing, and the horn-shaped sealing cover is fixedly connected to the bottom of the retaining ring. An inner ring comb-shaped sealing ring (4) is fixedly installed on the inner ring of the sealing bearing at the top of the retaining ring. The top of the horn-shaped sealing cover is integrally connected with a vertical pipe (7), and the top of the vertical pipe is fixedly connected to a retaining ring; a water-blocking groove (11) is provided on the outer surface of the horn-shaped sealing cover, and the water-blocking groove is spirally arranged, with the spiral direction opposite to the rotation direction of the water turbine. c. A bearing housing (3) is fixedly installed on the outside of the outer ring (1) of the sealed bearing. The bearing housing is provided with mounting holes for mounting bolts. An outer ring comb-shaped sealing ring (5) corresponding to the inner ring comb-shaped sealing ring is installed in the middle of the bearing housing. The inner ring comb-shaped sealing ring and the outer ring comb-shaped sealing ring are connected to each other by a snap-fit, thereby forming a loop-shaped sealing structure to achieve the purpose of sealing. d. The bottom of the bearing housing is an L-shaped return water ring (8), the edge of the retaining ring is inserted into the L-shaped return water ring, and a drain hole (12) is opened at the bottom of the bearing housing. The height of the drain hole is lower than the top of the L-shaped return water ring.

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