JPH03206365A - Prevention device for inflow of earth and sand to main shaft sealing water part - Google Patents

Abstract

PURPOSE:To prevent an inflow of earth and sand into the sealing water part of a main shaft by dispersing the earth and sand flowing in a heat pipe cooling chamber with a disc fixed on the main shaft, making collide the earth and sand against a cover fixed with a partition plate, and hereafter discharging them outward through a sand-flash port. CONSTITUTION:Cooling water is supplied from a water supply port 10 to a heat pipe cooling chamber 9 formed by covering a main shaft 4 with a cover 12. A main shaft sealing water part 15 is adjacent to the cooling chamber 9 and formed out of a mechanical seal. In the above-stated constitution, water flow in the cooling chamber 9 is rotated with a disc 11 fixed on the main shaft 4, and earth and sand contained in the cooling water supplied from the water supply port 10 is outward dispersed due to centrifugal force. The earth and sand are made collide against the cover 12 fixed with a partition plate 13, and hence the earth and sand are discharged outside from a sand-flash port 14 without flowing into the main shaft sealing water part 15. Hereby, an inflow of earth and sand into the main shaft sealing water part 15 is surely prevented.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a device for preventing the inflow of earth and sand into the main shaft water sealing section of a horizontal shaft water turbine generator using a heat pipe.

[Conventional technology]

FIG. 2 is a vertical cross-sectional view of a horizontal-shaft water turbine generator using a conventional heat pipe. In Figure 2, l is a journal bearing, 2 is a bearing stand, 3 is a thrust bearing, 4 is a main shaft,
5 is a lubricating oil, 6 is a runner 7 is a heat vibrator, 8 is a steam space, 9 is a heat pipe cooling chamber, 16 is an upper lid, 17 is a guide vane, 18 is a suction pipe, 19 is a water pipe, 20 is a working fluid, 21 is the thrust color. In FIG. 2, the inside of the main shaft 4 is hollow and the hydraulic fluid 20 is
and the steam space 8 of the runner 6 with the bearing side as the heat generating part.
A heat pipe is formed with the condensing part as the condensing part. Most of the heat generated in journal bearing 1 and thrust bearing 3 is
It reaches the vapor space 8 of the heat pipe 7 and is transmitted to the working fluid 20, evaporates and becomes vapor, moves to the runner 6 side which is the condensing section, is cooled in the water passage section, and condenses to become a liquid. This liquid is returned to the heat generating part side by the action of centrifugal force caused by the rotation of the main shaft 4. The condensing section consists of a heat pipe cooling chamber 9 covered by a runner boss section and a water pipe 19, and is cooled by the flow of these sections. Conventionally, a mechanical seal is used in the main shaft water sealing section that seals water leaking from the main shaft of a horizontal shaft water turbine generator that uses a heat pipe. Water was supplied from the labyrinth section of the cooling room 9.

[Problem to be solved by the invention]

Conventionally, no means has been taken to prevent earth and sand from flowing into the main shaft water sealing section adjacent to the heat pipe cooling chamber 9. However, in order to supply water to the heat-vib cooling chamber, a certain amount of dirt and sand flows into the heat pipe cooling chamber, and further, the sand and sand flows into the adjacent main shaft water sealing section, sometimes damaging the mechanical seal. The present invention aims to provide a sediment inflow visiting device for a main shaft water sealing part that prevents earth and sand flowing into a heat pipe cooling chamber of a horizontal shaft water turbine generator using a heat pipe from entering the main shaft water sealing part. purpose.

[Means to solve the problem]

The above purpose is that the main shaft directly connected to the runner is horizontally supported by journal bearings and thrust bearings outside the casing, and the journal bearing and thrust bearing are used as heat generating parts in the main shaft to condense the runner side water passage exposed to the waterway. In the main shaft water sealing part that seals water leaking from the main shaft of the horizontal shaft water turbine generator forming a heat pipe, the heat vip cooling is formed by covering the main shaft with a cover adjacent to the main shaft sealing part. a circular plate located indoors and fixed to the outer periphery of the main shaft; an annular partition plate attached to the cover and disposed near the main shaft water sealing part of the heat pipe cooling chamber; This is achieved by providing a sand discharge port that opens at the bottom.

[For use]

This invention includes a disk located in a heat pipe cooling chamber formed by covering a main shaft with a heat pipe cooling chamber and fixed to the outer periphery of the main shaft, and a sand discharge port that is attached to the heat pipe cooling chamber and opens at the bottom of the heat pipe cooling chamber. Since this is provided, the earth and sand flowing into the Heatvibe cooling chamber are blown away to the outer periphery by the centrifugal force of the disk, and the blown earth and sand are collected in the cover and discharged from the sand discharge port. The partition plate attached to the cover prevents dirt from flowing into the main shaft water seal from the heat vip cooling chamber.

【Example】

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is a longitudinal cross-sectional view of a sediment inflow prevention device for a main shaft water sealing section according to an embodiment of the present invention. In FIG. 1, the inside of the main shaft 4 is made hollow and a working fluid is sealed therein, forming a heat pipe in which the bearing side (not shown) is the heat generating part and the vapor space of the runner is the condensing part. The first part of the heat generated by the journal bearing and thrust bearing (not shown) reaches the steam space of the heat pipe, is transmitted to the working fluid, blooms, becomes steam, moves to the runner side which is the condensation part, and is transferred to the water passage part. It cools and condenses into a liquid. This liquid is returned to the heat generating part side by the action of centrifugal force caused by the rotation of the main shaft. The condensing section consists of a heat pipe cooling chamber 9 formed by covering the outside of the runner boss seal and the main shaft with a cover 12, and cooling water is supplied to this heat pipe cooling chamber 9 from a water supply port 10. Adjacent to the heat pipe cooling chamber 9, a main shaft water sealing section 15 is constructed by a mechanical seal. This invention comprises: a disk 11 fixed to the main shaft 4 in the heat vip cooling chamber 9; an annular partition plate 13 attached to the cover 12 and disposed near the main shaft water sealing part 15 in the heat vipe cooling chamber 9; A sand discharge port 14 opened at the bottom of the heat vipe cooling chamber 9 was provided. A heat pipe cooling chamber 9 is formed by a disk 11 attached to the main shaft.
The water flow inside is rotated, the earth and sand mixed in the water supplied from the water supply port 10 is blown outward by centrifugal force, the earth and sand is applied to the cover 12, and the collected earth and sand is discharged to the outside from the sand discharge port 14. In addition, since the partition plate 13 is provided, the earth and sand in the heat pipe cooling chamber 9 is partitioned off by the partition plate 13.
There is no risk of water flowing into the main shaft water sealing section 15.

【Effect of the invention】

In this invention, a disk is provided on the main axis in the heat pipe cooling chamber, and this disk uses centrifugal force to blow the dirt flowing into the heat pipe cooling chamber outward and collect it on the cover, and the collected dirt is removed from the sand discharge port. Since the heat pipe is discharged, the earth and sand will not accumulate in the heat pipe cooling chamber, and the blown earth and sand will be separated by the partition plate, so the earth and sand will not flow into the main shaft water sealing part. Therefore, the earth and sand entrapment prevention device according to the present invention can completely seal the main shaft with water, thereby improving the performance of the horizontal shaft water turbine generator.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a device for preventing the inflow of earth and sand in a main shaft water sealing section according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a horizontal shaft water turbine generator using a conventional heat pipe. l: Journal bearing, 3: Thrust bearing, 4: Main shaft, 6
: runner, 7: heat vip, 9: heat pipe cooling chamber, 11 two discs, 12: cover 13: partition plate, work 4:
Sand discharge port, 15: Main shaft water sealing part.

Claims (1)

[Claims] 1) A main shaft directly connected to the runner is horizontally supported by a journal bearing and a thrust bearing outside the casing, the journal bearing and the thrust bearing are used as a heat generating part in the main shaft, and a water passage part on the runner side exposed to the waterway is used as a condensing part. In a main shaft water sealing section for sealing water leaking from the main shaft of a horizontal shaft water turbine generator forming a heat pipe, a heat pipe cooling chamber is formed by covering the main shaft with a cover adjacent to the main shaft water sealing section. a circular plate fixed to the outer periphery of the main shaft; an annular partition plate attached to the cover and disposed near the main shaft water sealing part of the heat pipe cooling chamber; A device for preventing the inflow of sediment into a main shaft water sealing section, characterized by having a sand discharge port opening at the bottom.