A water-lubricated bearing device for a horizontal shaft turbine

Abstract

This utility model belongs to the field of water turbine technology and discloses a water-lubricated bearing device for a horizontal shaft water turbine. It includes a water turbine runner, one end of which is fixedly connected to a drive shaft via bolts. An anti-wear sleeve is fitted around the drive shaft, and a sealing device is fitted around the anti-wear sleeve. A bearing seat located on the side of the drive shaft away from the water turbine runner is fitted around the drive shaft. A water lubrication mechanism is fitted between the drive shaft and the bearing seat. Due to the automatic holding spring, when the sealing device wears, the anti-wear sleeve and bearing seat further compress the sealing device against the outer surface of the anti-wear sleeve, thereby achieving a high-performance seal and long-lasting seal between the water lubrication mechanism and the water in the flow channel. This ensures that the water in the flow channel is completely blocked from the water-lubricated bearing, preventing rapid wear of the bearing bush caused by the ingress of muddy water or sediment in the flow channel.

Description

Technical Field

[0001] This utility model belongs to the field of water turbine technology, specifically a water-lubricated bearing device for a horizontal shaft water turbine. Background Technology

[0002] Horizontal shaft turbines use two types of lubricated bearings: oil-lubricated bearings and water-lubricated bearings. Oil-lubricated bearings are prone to contaminating the flow channel water, and in smaller turbine models, their large size and complexity make them difficult to arrange. Therefore, water-lubricated bearings are often the only option. Water-lubricated bearings generally have a simpler structure, most commonly involving directly flowing clean pressurized water into the bearing shell, with the lubricated water draining out from the bottom. Traditionally, it was believed that the lubricating water pressure in water-lubricated bearings is 0.2–0.3 MPa, which is higher than the flow channel water pressure, preventing flow channel water from entering the bearing shell. Therefore, the issue of flow channel water causing wear to the bearing shell was not considered.

[0003] In reality, for hydropower stations with a lot of sediment, when too much sediment accumulates in the cavity, it will block the drainage channel of the water-lubricated bearing. Sediment and muddy water will still enter the bearing shell, causing rapid wear of the bearing shell. Therefore, water-lubricated bearings cannot completely avoid wear on the bearing shell. Therefore, it is necessary to develop a water-lubricated bearing device for horizontal shaft turbines to solve the shortcomings of existing technologies. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a water-lubricated bearing device for a horizontal shaft turbine, which has the advantage of ensuring the sealing performance of the water-lubricated bearing to prevent wear.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a water-lubricated bearing device for a horizontal shaft turbine, comprising a turbine runner, one end of which is fixedly connected to a drive shaft by bolts, an anti-wear sleeve is sleeved on the outside of the drive shaft, a sealing device is sleeved on the outside of the anti-wear sleeve, a bearing seat is sleeved on the outside of the drive shaft, located on the side of the sealing device away from the turbine runner, a water lubrication mechanism is sleeved between the drive shaft and the bearing seat, the side of the drive shaft outside the bearing seat near the turbine runner is a flow channel water area, the sealing device is connected between the side of the bearing seat near the turbine runner and the drive shaft, and the sealing device separates the water lubrication mechanism from the flow channel water; The sealing device consists of a sealing packing, a sealing seat, and an automatic holding spring. One end of the sealing seat is fixedly fitted to the bearing seat. One side of the sealing packing is sealed to the outside of the anti-wear sleeve, and the other side of the sealing packing is sealed to the side of the sealing seat away from the bearing seat. One end of the automatic holding spring is fixedly connected to the pressure cover, and the other end of the automatic holding spring is connected to the outer surface of the sealing packing away from the sealing seat.

[0006] Furthermore, the axis of the transmission main shaft coincides with the axis of the turbine runner, and the outer diameter of the transmission main shaft is smaller than the outer diameter of the turbine runner.

[0007] Furthermore, the wear-resistant sleeve has a split structure and is detachably installed on the transmission spindle; the outer surface of the wear-resistant sleeve is made of stainless steel wear-resistant material and is spray-coated.

[0008] Furthermore, the sealing packing is made of GFO braided fiber.

[0009] Furthermore, one end of the automatic holding spring is abutted and connected to the outside of the anti-wear sleeve, and the other end of the automatic holding spring is connected to a pressure cap that is slidably snapped onto the outer surface of the anti-wear sleeve. The opposing surfaces of the pressure cap and the sealing seat are both inclined downwards and fit on both sides of the outer surface of the sealing packing.

[0010] Furthermore, the bearing housing is externally connected to an internal water ring, and the water lubrication mechanism consists of a bearing base, several bearing bush blanks, and anti-rotation positioning blocks. The bearing base is fitted inside the bearing housing, and the bearing bush blanks are made of AC-3 composite material. Several bearing bush blanks are fitted inside the bearing base, and the bearing bush blanks are fixedly connected to the bearing base through the anti-rotation positioning blocks. A bearing sleeve is fitted inside the several bearing bush blanks.

[0011] Furthermore, the bearing sleeve is fitted onto the outside of the transmission main shaft, the bearing sleeve is made of stainless steel wear-resistant material, and the outer surface of the bearing sleeve is sprayed.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Due to the automatic holding spring, when the sealing device wears, under the constraint of the anti-wear sleeve and the bearing seat, the sealing device is further pressed against the outer surface of the anti-wear sleeve, thereby achieving sealing performance and sealing durability between the water lubrication mechanism and the flow channel water. This ensures that the flow channel water is completely blocked outside the water lubrication bearing, thus preventing the water lubrication bearing from experiencing rapid wear of the bearing bush due to the entry of mud and sand into the flow channel.

[0013] 2. Due to the anti-wear sleeve, this utility model can provide supplementary sealing for the sealing packing by the automatic holding spring in cooperation with the sealing seat. At the same time, the split structure of the anti-wear sleeve can be easily installed on the transmission spindle. Furthermore, when the surface of the anti-wear sleeve is worn, it can be removed and replaced without disassembling the transmission spindle.

[0014] 3. In order to ensure the smooth flow of the lubrication water circuit of the water-lubricated bearing, the entire water circuit adopts an equivalent diameter design to reduce water pressure loss; and the lubricating water after lubrication is completed is freely discharged to the tailwater channel or collection well through an equivalent diameter water pipe.

[0015] 4. By setting the anti-rotation positioning block, this utility model facilitates the fitting and installation of several bearing blanks into the bearing base. When wear occurs between the bearing blank and the bearing sleeve, the bearing blank can be removed from the bearing base and the transmission shaft and replaced by the anti-rotation positioning block without disassembling the entire water lubrication mechanism, thus improving interchangeability and versatility and effectively extending the service life of the water-lubricated bearing. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 This is a cross-sectional schematic diagram of the water-lubricated bearing bush of this utility model; Figure 3 This is a side view of the water-lubricated bearing of this utility model.

[0017] In the diagram: 1. Turbine runner; 2. Drive shaft; 3. Wear-resistant sleeve; 4. Sealing packing; 5. Sealing seat; 6. Automatic holding spring; 7. Internal water ring; 8. Bearing base; 9. Bearing blank; 10. Anti-rotation positioning block; 11. Bearing seat; 12. Bearing sleeve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figures 1 to 3 As shown, this utility model provides a water-lubricated bearing device for a horizontal shaft turbine, including a turbine runner 1. One end of the turbine runner 1 is fixedly connected to a drive shaft 2 by bolts. An anti-wear sleeve 3 is sleeved on the outside of the drive shaft 2. A sealing device is sleeved on the outside of the anti-wear sleeve 3. A bearing seat 11 is sleeved on the outside of the drive shaft 2, located on the side of the sealing device away from the turbine runner 1. A water lubrication mechanism is sleeved between the drive shaft 2 and the bearing seat 11. The side of the drive shaft 2 outside the bearing seat 11 near the turbine runner 1 is the flow channel water area. The sealing device is connected between the side of the bearing seat 11 near the turbine runner 1 and the drive shaft 2, and the sealing device separates the water lubrication mechanism from the flow channel water. The sealing device consists of a sealing packing 4, a sealing seat 5, and an automatic holding spring 6. One end of the sealing seat 5 is fitted onto the bearing housing 11. One side of the sealing packing 4 is sealed against the outside of the anti-wear sleeve 3, and the other side of the sealing packing 4 is sealed against the side of the sealing seat 5 away from the bearing housing 11. One end of the automatic holding spring 6 is fixedly connected to the pressure cap, and the other end of the automatic holding spring 6 is abutted against the outer surface of the sealing seat 5. Due to the setting of the automatic holding spring 6, when the sealing device wears, under the restriction of the anti-wear sleeve 3 and the bearing housing 11, the sealing device is further pressed against the outer surface of the anti-wear sleeve 3, thereby achieving sealing performance and sealing durability between the water lubrication mechanism and the flow channel water, thus ensuring that the flow channel water is completely blocked outside the water lubrication bearing, thereby avoiding the rapid wear of the bearing bush caused by the entry of mud and sand into the flow channel.

[0020] The axis of the transmission main shaft 2 coincides with the axis of the turbine runner 1, and the outer diameter of the transmission main shaft 2 is smaller than the outer diameter of the turbine runner 1.

[0021] The wear-resistant sleeve 3 has a split structure and is detachably installed on the transmission spindle 2. The outer surface of the wear-resistant sleeve 3 is made of stainless steel wear-resistant material and is sprayed. The spraying material on the outer surface of the wear-resistant sleeve 3 includes, but is not limited to, silicon carbide or tungsten carbide. Due to the design of the anti-wear sleeve 3, the automatic holding spring 6 can supplement the sealing performance of the sealing packing 4 with the cooperation of the sealing seat 5. At the same time, the split structure of the anti-wear sleeve 3 allows it to be easily installed on the transmission spindle 2. Furthermore, when the surface of the anti-wear sleeve 3 is worn, it can be removed and replaced without disassembling the transmission spindle 2.

[0022] Among them, the sealing packing 4 is made of GFO woven fiber.

[0023] One end of the automatic holding spring 6 is abutted against and connected to the outer surface of the sealing seat 5, and the other end of the automatic holding spring 6 is connected to a pressure cap that is slidably snapped onto the outer surface of the anti-wear sleeve 3. The opposing surfaces of the pressure cap and the sealing seat 5 are both inclined downwards and are fitted to both sides of the outer surface of the sealing packing 4.

[0024] The bearing housing 11 is externally connected to the internal water ring 7. The water lubrication mechanism consists of a bearing base 8, several bearing blanks 9, and an anti-rotation positioning block 10. The bearing base 8 is fitted inside the bearing housing 11. The bearing blanks 9 are made of AC-3 composite material. Several bearing blanks 9 fit inside the bearing base 8. The bearing blanks 9 are fixedly connected to the bearing base 8 by the anti-rotation positioning block 10. A bearing sleeve 12 is fitted inside the several bearing blanks 9. The anti-rotation positioning block 10 facilitates the fitting and installation of several bearing blanks 9 into the bearing base 8. When wear occurs between the bearing blanks 9 and the bearing sleeve 12, the bearing blanks 9 can be removed from the bearing base 8 and the transmission shaft 2 and replaced by the anti-rotation positioning block 10 without disassembling the entire water lubrication mechanism, thus improving interchangeability and versatility and effectively extending the service life of the water-lubricated bearing.

[0025] The bearing sleeve 12 is fitted onto the outside of the transmission main shaft 2. The bearing sleeve 12 is made of stainless steel wear-resistant material and the outer surface of the bearing sleeve 12 is sprayed. The spraying material on the outer surface of the bearing sleeve 12 includes, but is not limited to, silicon carbide or tungsten carbide.

[0026] Working principle and usage process of this utility model: First, the drainage diameter is larger than the inlet diameter. Specifically, at the inlet: clean water with a pressure of 0.2–0.3 MPa is supplied. The water quality requirements are: clean soft water, sand particle diameter ≤30 μm, sand content less than 0.05 g / L, and neutral pH. The water pipe diameter is DN15, and the water flow is small, about 1 m³ / h, serving a lubrication and cooling function. At the outlet: water with a pressure of 0.2–0.3 MPa flows in. The water quality is clean soft water, sand particle diameter ≤30 μm, sand content less than 0.5 g / L, and neutral pH. The water pipe diameter is DN25, and the water flow is about 3 m³ / h. After lubrication, the lubricating water is freely discharged to the tailrace channel or collection well through a water pipe of equivalent diameter. The sealing structure, such as the sealing packing 4 made of woven fibers, allows the mud and sand in the flow channel to be freely discharged into the tailrace channel or collection well in front of the sealing device, and the drainage diameter is larger than the inlet diameter. Under the elastic restoring force of the automatic holding spring 6, a certain clamping force is applied to the sealing packing 4 in the sealing element through the pressure cover, and under the restriction of the anti-wear sleeve 3, a good seal is achieved through the sealing seat. Moreover, when the sealing packing 4 is worn, under the restoring force of the automatic holding spring 6, it outputs pressure and makes the sealing packing 4 further automatically compensate, thus playing a continuous sealing role and extending the service life and sealing performance of the sealing packing 4. The anti-wear sleeve 3 with a split structure is installed on the transmission spindle 2. When the anti-wear surface of the anti-wear sleeve 3 is worn, the split anti-wear sleeve 3 can be disassembled without disassembling the transmission spindle 2. In the water-lubricated bearing, the steel bearing base 8 and its internal bearing shell blank 9 pass through, and a bearing sleeve 12 is added to the outside of the transmission main shaft 2 to serve the purpose of positioning the transmission main shaft 2; It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-lubricated bearing device for a horizontal shaft turbine, comprising a turbine runner (1), characterized in that: One end of the turbine runner (1) is fixedly connected to the drive shaft (2) by bolts. The drive shaft (2) is fitted with an anti-wear sleeve (3). The anti-wear sleeve (3) is fitted with a sealing device. The drive shaft (2) is fitted with a bearing seat (11) located on the side of the sealing device away from the turbine runner (1). A water lubrication mechanism is fitted between the drive shaft (2) and the bearing seat (11). The side of the drive shaft (2) located on the bearing seat (11) near the turbine runner (1) is the flow channel water area. The sealing device is connected between the side of the bearing seat (11) near the turbine runner (1) and the drive shaft (2). The sealing device separates the water lubrication mechanism from the flow channel water. The sealing device consists of a sealing packing (4), a sealing seat (5), and an automatic holding spring (6). One end of the sealing seat (5) is fixedly fitted onto the bearing seat (11). One side of the sealing packing (4) is sealed against the outside of the anti-wear sleeve (3), and the other side of the sealing packing (4) is sealed against the side of the sealing seat (5) away from the bearing seat (11). One end of the automatic holding spring (6) is fixedly connected to the sealing seat (5), and the other end of the automatic holding spring (6) is abutted against the outer surface of the sealing seat (5).

2. The water-lubricated bearing device for a horizontal shaft turbine according to claim 1, characterized in that: The axis of the transmission main shaft (2) coincides with the axis of the turbine runner (1), and the outer diameter of the transmission main shaft (2) is smaller than the outer diameter of the turbine runner (1).

3. The water-lubricated bearing device for a horizontal shaft turbine according to claim 1, characterized in that: The wear-resistant sleeve (3) has a split structure and is detachably installed on the transmission spindle (2); the outer surface of the wear-resistant sleeve (3) is made of stainless steel wear-resistant material and the outer surface of the wear-resistant sleeve (3) is sprayed.

4. The water-lubricated bearing device for a horizontal shaft turbine according to claim 1, characterized in that: The sealing packing (4) is made of GFO braided fiber.

5. The water-lubricated bearing device for a horizontal shaft turbine according to claim 1, characterized in that: One end of the automatic holding spring (6) is abutted against the outside of the sealing seat (5), and the other end of the automatic holding spring (6) is connected to a pressure cap. The opposing surfaces of the pressure cap and the sealing seat (5) are both inclined downwards and fit on both sides of the outer surface of the sealing packing (4).

6. The water-lubricated bearing device for a horizontal shaft turbine according to claim 1, characterized in that: The bearing housing (11) is externally connected to an internal water ring (7). The water lubrication mechanism consists of a bearing base (8), several bearing blanks (9), and an anti-rotation positioning block (10). The bearing base (8) is fitted inside the bearing housing (11). The bearing blanks (9) are made of AC-3 composite material. Several bearing blanks (9) are fitted inside the bearing base (8). The bearing blanks (9) are fixedly connected to the bearing base (8) through the anti-rotation positioning block (10). A bearing sleeve (12) is fitted inside the several bearing blanks (9).

7. A water-lubricated bearing device for a horizontal shaft turbine according to claim 6, characterized in that: The bearing sleeve (12) is fitted onto the outside of the transmission main shaft (2). The bearing sleeve (12) is made of stainless steel wear-resistant material and the outer surface of the bearing sleeve (12) is sprayed.

Images