Aeration and cavitation reduction device for hydraulic machinery

Abstract

The utility model relates to the technical field of hydraulic machinery corrosion reduction, in particular to a hydraulic machinery aeration corrosion reduction device which comprises a hydraulic machinery body, the hydraulic machinery body comprises a water wheel rotating wheel, a plurality of water wheel blades are fixed on the outer side of the water wheel rotating wheel at equal intervals, a wheel shaft is fixed at one end of the water wheel rotating wheel, and a bulb cover is installed on the outer side of the wheel shaft. The water wheel runner is close to the bulb cover, a bearing seat is installed in the bulb cover, the wheel shaft is installed through the bearing seat, an air distribution disc is installed in the bulb cover between the bearing seat and the water wheel runner, an opening is formed in the right side face, facing the water wheel runner, of the air distribution disc, a shaft penetrating hole is formed in the middle of the air distribution disc, and the wheel shaft penetrates through the air distribution disc through the shaft penetrating hole. The air distribution disc is arranged close to the water wheel rotating wheel, when water in the rotating wheel chamber pushes the water wheel blades to rotate, the air distribution disc ventilates the water, a certain amount of air is mixed into the water, then air is used for weakening cavitation destructive power on the surfaces of the water wheel blades, and the cavitation reduction effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic machinery erosion reduction, specifically relates to a kind of hydraulic machinery aeration erosion reduction device. BACKGROUND

[0002] Hydraulic machinery is the liquid (usually water) as working medium, realizes energy conversion and transmission mechanical equipment, plays key role in energy development, water conservancy, industrial production and other fields.According to energy conversion direction, hydraulic machinery can be divided into two categories of prime mover and working machine, and the water turbine for hydroelectric power generation is the typical representative of prime mover.

[0003] When the blade of water turbine rotates in runner chamber, due to the diameter difference of front and rear water culverts and draft tube, plus the rotation of blade, the blade will have cavitation phenomenon, and cavitation will cause the service life of blade to be shortened.Currently, there are various means to solve cavitation, among which the most widely used on water turbine is material improvement, such as applying anti-cavitation coating on the surface of blade.Compared with aeration erosion reduction means, this improvement method has higher cost, and the anti-cavitation effect is directly determined by material improvement process, so if the improvement process is not in place, the anti-cavitation effect will be greatly weakened, and the stable and reliable aeration erosion reduction method is currently mostly applied in water conservancy culvert, and there is no practical application case found on water turbine. SUMMARY

[0004] The utility model discloses in order to realize above-mentioned purpose specifically adopts following technical scheme:

[0005] A kind of hydraulic machinery aeration erosion reduction device, including hydraulic machinery body, hydraulic machinery body includes water wheel runner, and the outer side of water wheel runner is fixed with multiple water wheel leaves of equal interval, the one end of water wheel runner is fixed with wheel shaft, and the outer side of wheel shaft is installed with bulb cover, and water wheel runner is close to bulb cover, and bearing seat is installed in bulb cover, and wheel shaft is installed by bearing seat, and bearing seat and water wheel runner between bulb cover are installed with gas distribution disc, the right side surface of water wheel runner is opened to the opening of gas distribution disc, air hole is set up on gas distribution disc, and shaft hole is set up in the middle position of gas distribution disc, and wheel shaft passes through shaft hole and passes through gas distribution disc.

[0006] Further, the left side of the gas distribution disc is installed with a gas supply pipe, which includes a fixed pipe. The fixed pipe is provided with multiple roots. The multiple roots of the fixed pipe are arranged at equal intervals on the left side of the gas distribution disc corresponding to the outer side of the shaft hole. The right end of the fixed pipe is fixed with the gas distribution disc at the corresponding position. The air hole is arranged corresponding to the position of the fixed pipe. The multiple roots of the fixed pipe are fixedly connected through a communication pipe. The communication pipe is fixedly connected with a gas supply pipe. The gas supply pipe ensures continuous and stable gas supply.

[0007] Further, the gas supply pipe first vertically penetrates the lampshade between the bearing seat and the gas distribution disc, and then horizontally penetrates the lampshade on the left side of the bearing seat. The first penetration and then the second penetration of the gas supply pipe do not affect the installation of the bearing seat and the waterproof sealing of the lampshade at the position of the bearing seat.

[0008] Further, the gas supply pipe in the lampshade is provided with a one-way valve. The one-way valve prevents the backflow of water through the gas supply pipe when the water body is not aerated.

[0009] Further, each fixed pipe on the left side of the gas distribution disc is fixed with a bucket-shaped cover, the bucket-shaped cover is in communication with the inside of the fixed pipe, the bucket-shaped cover is fixed at the corresponding position of the gas distribution disc, and the air holes are arranged at multiple positions corresponding to each bucket-shaped cover and are equidistantly arranged. The increase in the number of air holes is conducive to the increase in the gas diffusion area, and the bucket-shaped cover adapts to the arrangement position of the multiple air holes.

[0010] Further, the movable plate is arranged in the gas distribution disc, the movable plate and the gas distribution disc are both provided with shaft through holes at the middle positions, the shafts pass through the shaft through holes of the movable plate and the gas distribution disc, a plurality of through holes are equidistantly arranged on the movable plate, a groove is arranged on the inside of the movable plate at each through hole, a fixed column is fixed at the position corresponding to each through hole in the gas distribution disc, a slide rod is fixed at the right end center position of each fixed column, the diameter of the slide rod is smaller than that of the fixed column, a through hole is arranged on the movable plate at the position corresponding to each slide rod, the slide rod passes through the through hole to form a sliding support of the movable plate, and the diameter of the fixed column is greater than that of the through hole. When the movable plate abuts against the fixed column, the abutment sealing can be formed by using the water pressure, and the backflow is prevented by cooperating with the one-way valve.

[0011] Further, the ring plate one is fixed in the gas distribution disc outside the fixed column, the ring plate two is fixed on the left side of the movable plate outside the slide rod, and the tension spring is fixed between the ring plate one and the ring plate two at the corresponding position. The tension spring ensures that the movable plate can abut against the fixed column stably and reliably when the water body is not aerated.

[0012] Further, the anti-disengagement plate is fixed at the right end of the slide rod, the stop ring is fixed at the right position inside the gas distribution disc, and the movable plate abuts against the anti-disengagement plate and the stop ring to form the anti-disengagement limit position. The anti-disengagement plate and the stop ring cooperate to prevent the movable plate from disengaging.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. The utility model uses the gas distribution disc to be arranged close to the water wheel, when the water body in the runner chamber drives the water wheel blade to rotate, the water body is aerated by the gas distribution disc, a certain amount of air is mixed into the water body, and then the air is used to weaken the cavitation damage on the surface of the water wheel blade, so that the erosion is reduced.

[0015] 2. The movable plate, fixed column, and sliding rod in this utility model allow the movable plate to move by sliding on the sliding rod. At the same time, when the movable plate abuts against the fixed column, it can perform backflow sealing to prevent water from entering the bulb cover.

[0016] 3. In this utility model, the movable plate is connected by a tension spring. When there is no air supply, it can ensure that the movable plate can stably and reliably abut against the fixed column, and cooperate with the one-way valve on the air pipe to achieve backflow sealing.

[0017] 4. In this utility model, the movable plate not only has a backflow sealing effect in conjunction with the fixed column, but also the multi-position setting of the groove is conducive to better dispersing and integrating the gas into the water body, so as to ensure sufficient air content to reduce cavitation damage. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is an enlarged view of point A in this utility model;

[0021] Figure 4 This is a perspective view of the movable plate in this utility model;

[0022] Figure 5 This is a schematic diagram of the tension spring arrangement in this utility model;

[0023] Figure 6 This is a usage example diagram of this utility model.

[0024] Reference numerals in the attached drawings: 1. Main body of the hydraulic machinery; 11. Water turbine runner; 12. Water turbine blade; 13. Axle; 14. Bulb cover; 15. Bearing seat; 2. Air distribution plate; 21. Movable plate; 22. Fixed column; 23. Slide rod; 24. Vent hole; 25. Ring plate one; 26. Ring plate two; 27. Tension spring; 28. Through hole; 29. ​​Shaft through hole; 210. Retaining ring; 211. Anti-detachment plate; 212. Groove; 3. Air supply pipe fittings; 31. Fixed pipe; 32. Connecting pipe; 33. Air delivery pipe; 34. One-way valve; 35. Bucket-shaped cover. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] The application provides a water conservancy machinery air mixing and cavitation reduction device, mainly solves the problem of high cost in the way of avoiding cavitation by material improvement of the water turbine blade, and provides the following technical scheme, which will be described in detail below Figures 1-6 Detailed description is made as follows:

[0027] The water conservancy machinery air mixing and cavitation reduction device comprises a water conservancy machinery body 1, the water conservancy machinery body 1 comprises a water turbine runner 11, a plurality of water turbine blades 12 are fixed at equal intervals on the outer side of the water turbine runner 11, a wheel shaft 13 is fixed at one end of the water turbine runner 11, a bulb cover 14 is installed on the outer side of the wheel shaft 13, the water turbine runner 11 is close to the bulb cover 14, a bearing seat 15 is installed in the bulb cover 14, and the wheel shaft 13 is installed through the bearing seat 15;

[0028] A gas distribution disc 2 is installed in the bulb cover 14 between the bearing seat 15 and the water turbine runner 11, the gas distribution disc 2 is opened on the right side surface facing the water turbine runner 11, an axle through hole 29 is formed at the middle position of the gas distribution disc 2, the wheel shaft 13 passes through the gas distribution disc 2 through the axle through hole 29, and a gas supply pipe 3 is installed on the left side of the gas distribution disc 2;

[0029] The gas supply pipe 3 comprises a plurality of fixed pipes 31, the plurality of fixed pipes 31 are arranged at equal intervals at positions corresponding to the outer side of the axle through hole 29 on the left side of the gas distribution disc 2, the fixed pipes 31 are fixed to the corresponding positions of the gas distribution disc 2 at the right ends, air holes 24 are formed in the gas distribution disc 2 at positions corresponding to the fixed pipes 31, the plurality of fixed pipes 31 are fixedly connected through a communication pipe 32, a gas conveying pipe 33 is fixed to the communication pipe 32, the gas conveying pipe 33 first vertically penetrates out of the bulb cover 14 between the bearing seat 15 and the gas distribution disc 2 and then horizontally penetrates into the bulb cover 14 on the left side of the bearing seat 15, a one-way valve 34 is installed on the gas conveying pipe 33 in the bulb cover 14, and the one-way valve 34 is arranged in a one-way mode in which the left side of the gas conveying pipe 33 is opened to the right side and the right side is closed to the left side.

[0030] Before use, the gas conveying pipe 33 is connected with a gas supply device such as a fan or an air compressor, when the water flow pressure in the runner chamber is large, the air compressor is used for gas supply, so that the gas can be sent into the water with sufficient pressure, otherwise, when the water flow pressure is small, the fan can be used for gas supply, when the water turbine runner 11 is driven to rotate by the water flow in the runner chamber, the gas input into the gas conveying pipe 33 first pushes away the valve plate of the one-way valve 34 to be opened, the gas continuously enters the communication pipe 32 through the gas conveying pipe 33, then enters each fixed pipe 31 through the communication pipe 32, and finally is discharged from the air holes 24 on the gas distribution disc 2, since the gas distribution disc 2 is close to the water turbine runner 11, the gas finally enters the water body at the position of the water turbine runner 11, so that the water body is mixed with air, the damage of cavitation to the water turbine blade 12 is weakened through the air mixing in the water, and the effect of cavitation reduction is achieved.

[0031] In some embodiments, a bucket-shaped cover 35 is fixed on each fixed pipe 31 on the left side of the air distribution disc 2, the bucket-shaped cover 35 is in communication with the inside of the fixed pipe 31, the bucket-shaped cover 35 is fixed with the air distribution disc 2 at the corresponding position, and the air holes 24 are arranged at multiple positions corresponding to each bucket-shaped cover 35 and at equal intervals.

[0032] The bucket-shaped cover 35 increases the coverage, so that more air holes 24 can be arranged, and the diameter of each air hole 24 can be reduced. The multiple air holes 24 facilitate the dispersion of the gas.

[0033] In some embodiments, a movable plate 21 is arranged in the air distribution disc 2, the movable plate 21 is provided with an axle through hole 29 at the middle position of the air distribution disc 2, the axle 13 passes through the axle through hole 29 of the movable plate 21 and the air distribution disc 2, a plurality of through holes 28 are arranged at equal intervals on the movable plate 21, a groove 212 is arranged on the inside of the movable plate 21 at each through hole 28, a fixed column 22 is fixed in the air distribution disc 2 at a position corresponding to each through hole 28, a slide rod 23 is fixed at the right end center of each fixed column 22, the diameter of the slide rod 23 is smaller than the diameter of the fixed column 22, a through hole 28 is arranged on the movable plate 21 at a position corresponding to each slide rod 23, and the slide rod 23 passes through the through hole 28 to form a sliding support of the movable plate 21.

[0034] The diameter of the fixed column 22 is greater than the diameter of the through hole 28, a ring plate one 25 is fixed in the air distribution disc 2 on the outside of the fixed column 22, a ring plate two 26 is fixed on the left side of the movable plate 21 on the outside of the slide rod 23, and a tension spring 27 is fixed between the ring plate one 25 and the ring plate two 26 at the corresponding position.

[0035] When the gas conveying pipe 33 is not ventilated, the tension spring 27 pulls the ring plate two 26, so that the movable plate 21 is close to the left side of the air distribution disc 2, and the movable plate 21 abuts against the fixed column 22. By using the difference in diameter between the fixed column 22 and the through hole 28, the movable plate 21 is sealed, so that the water flow is prevented from flowing back into the gas conveying pipe 33 through the through hole 28 and the air hole 24. At the same time, when not ventilated, the one-way valve 34 is closed, thereby comprehensively preventing the backflow of water.

[0036] When the gas conveying pipe 33 is ventilated, the ventilation pressure pushes the tension spring 27 to stretch, so that the movable plate 21 slides on the slide rod 23, and the movable plate 21 is away from the fixed column 22. The gas can be discharged from the position of the groove 212, so as to enter the water body for aeration.

[0037] In some embodiments, a anti-disengagement plate 211 is fixed at the right end of the slide rod 23, and a check ring 210 is fixed at the right position on the inside of the air distribution disc 2. The movable plate 21 abuts against the anti-disengagement plate 211 and the check ring 210 to form an anti-disengagement limit.

[0038] The anti-disengagement plate 211 and the check ring 210 limit the movable plate 21, so as to prevent the movable plate 21 from being excessively right-slid on the slide rod 23 and disengaged.

[0039] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic machinery aeration erosion reduction device, comprising a hydraulic machinery body (1), the hydraulic machinery body (1) comprising a water wheel runner (11), a plurality of water wheel blades (12) being fixed at equal intervals outside the water wheel runner (11), a wheel shaft (13) being fixed at one end of the water wheel runner (11), a bulb cover (14) being installed outside the wheel shaft (13), the water wheel runner (11) being close to the bulb cover (14), a bearing seat (15) being installed inside the bulb cover (14), the wheel shaft (13) being installed through the bearing seat (15), characterized in that, The bulb cover (14) between the bearing seat (15) and the water wheel (11) is provided with a gas distribution plate (2), the right side of the gas distribution plate (2) is open to the water wheel (11), the gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

2. A hydraulic machinery cavitation mitigation device according to claim 1, wherein, The left side of the gas distribution plate (2) is provided with a gas supply pipe (3), the gas supply pipe (3) comprises a plurality of fixed pipes (31), the plurality of fixed pipes (31) are arranged at equal intervals on the left side of the gas distribution plate (2) corresponding to the outer side of the shaft hole (29), the right end of the fixed pipe (31) is fixed with the corresponding position of the gas distribution plate (2), the gas hole (24) is arranged corresponding to the position of the fixed pipe (31), and the plurality of fixed pipes (31) are fixedly connected through the communication pipe (32). The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

3. A hydraulic mechanical aeration erosion reducing device according to claim 2, characterized in that The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

4. A hydraulic mechanical aeration erosion reducing device according to claim 3, characterized in that The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

5. A hydraulic mechanical aeration erosion reducing device according to claim 2, characterized in that, The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

6. A hydraulic mechanical aeration erosion reducing device according to claim 1, characterized in that The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

7. A hydraulic mechanical aeration erosion reducing device according to claim 6, characterized in that The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

8. A hydraulic mechanical aeration erosion reducing device according to claim 6, characterized in that The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2). The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2). The gas distribution plate (2) is provided with a gas hole (24), and the middle position of the gas distribution plate (2) is provided with a shaft hole (29), and the shaft (13) passes through the shaft hole (29) of the gas distribution plate (2).

Images