A device for reducing cavitation in a hydraulic machinery

Abstract

This invention provides an aeration and erosion reduction device for hydraulic machinery, comprising an aeration chamber and an air guiding chamber. The water intake pipe, aeration chamber, air guiding chamber, and air intake pipe of the hydraulic machinery are sequentially connected. The air intake pipe is connected to an air source. A partition block is also provided inside the air guiding chamber. The top surface of the partition block serves as a flow guiding surface, and the bottom surface of the partition block and the bottom surface of the air guiding chamber form a counter-current channel. One side of the counter-current channel serves as an inlet, and the other side serves as a outlet. The inlet is close to the aeration chamber, and the outlet is close to the air intake pipe. An air filling hole is also provided inside the partition block. One end of the air filling hole is connected to the counter-current channel, and the other end is connected to the air guiding chamber. Using the technical solution of this invention, when water enters the counter-current channel, the water undergoes aeration treatment within the counter-current channel and is promptly discharged from the counter-current channel, preventing the aeration device itself from being affected by cavitation and extending the service life of the aeration device.

Description

Technical Field

[0001] This invention relates to the field of water conservancy facilities technology, and in particular to an aeration and corrosion reduction device for hydraulic machinery. Background Technology

[0002] Hydraulic machinery comes in many types and is widely used in hydropower generation, agricultural irrigation, and industrial production. The core of hydraulic machinery is the conversion of the potential energy contained in flowing water into mechanical energy that drives mechanical components. When water propels these components, pressure differences within the high-speed flow cause cavitation. Cavitation occurs when the water pressure drops to the saturated vapor pressure at a given temperature, creating numerous air bubbles. These bubbles, carried by the water flow to high-pressure areas, rapidly collapse, generating strong localized impact forces. This results in cavitation erosion damage to the metal surfaces of the hydraulic machinery's components. Cavitation erosion is highly detrimental to hydraulic machinery, causing vibration and noise, and periodically impacting high-precision components. This pressure pulsation leads to fatigue failure, affecting the equipment's lifespan, increasing maintenance costs, and even potentially causing safety accidents.

[0003] In existing technologies, air-entraining erosion reduction technology is widely used to reduce the cavitation erosion effects of water flow on hydraulic machinery. The core of this technology is the introduction of an appropriate amount of air into the water flow. The introduced gas buffers the cavitation bubbles, thus mitigating the impact force when they collapse and reducing cavitation erosion damage to the metal surfaces of the corresponding mechanical components. However, because the air-entraining device must be connected to the water inlet pipe of the hydraulic machinery, when the water flow direction fluctuates, some water enters the device. This untreated water can also cause cavitation erosion on the internal metal structure of the air-entraining device, affecting its operational stability and service life. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an aeration and corrosion reduction device for hydraulic machinery.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides an aeration and corrosion reduction device for hydraulic machinery, comprising an aeration chamber and an air-guiding chamber. One side of the aeration chamber is connected to the water intake pipe of the hydraulic machinery, and the other side of the aeration chamber is connected to one side of the air-guiding chamber. The other side of the air-guiding chamber is connected to one end of the air intake pipe, and the other end of the air intake pipe is connected to an air source. A partition block is also provided inside the air-guiding chamber. The top surface of the partition block serves as a flow guiding surface, and the bottom surface of the partition block and the bottom surface of the air-guiding chamber form a counter-current channel. One side of the counter-current channel serves as an inlet, and the other side serves as a outlet. The inlet is close to the aeration chamber, and the outlet is close to the air intake pipe. An air-filling hole is also provided inside the partition block. One end of the air-filling hole is connected to the counter-current channel, and the other end is connected to the air-guiding chamber.

[0007] The hydraulic machinery equipment aeration and erosion reduction device further includes a discharge swing rod, a dispensing swing rod, a discharge control block, an air control block, a discharge control rope, and an air control rope. The partition block also contains a control chamber, a discharge control groove, and an air control groove. One side of the control chamber is connected to one side of the discharge groove, and the other side of the discharge groove is connected in parallel with the counter-current channel at the discharge outlet. The other side of the control chamber is connected to one side of the air control groove, and the other side of the air control groove is connected to the air inlet. The discharge swing rod... Both the dosage lever and the control lever are hinged in the control chamber. The control block is housed in the control groove, and the control block is housed in the control groove. The control chamber is also equipped with a float plate. The control block is also hinged to one end of the dosage lever. One end of the control rope is bolted to the other end of the dosage lever. The other end of the control rope is fixed to the float plate. The control block is also fixed to one end of the control rope. The other end of the control rope is bolted to one end of the discharge lever and hinged to the other end of the discharge lever. The other end of the discharge lever is hinged to the float plate.

[0008] The partition is also equipped with a detection groove. One side of the detection groove is connected to the control cavity, and the other side of the detection groove is connected to the countercurrent channel. The detection groove is also equipped with a float. The float is fixedly connected to one end of the boom, and the other end of the boom is hinged to the float plate.

[0009] The number of floats is multiple, and the multiple floats are arranged in a linear array with equal spacing along the length of the float plate.

[0010] The partition is also provided with a guide groove, which is connected to the control cavity. A slider is provided in the guide groove, and the slider is also fixedly connected to the float plate.

[0011] A fixed pulley is also hinged inside the control cavity, and both the release rope and the gas control rope are wound around the outer circumference of the fixed pulley.

[0012] The air-entraining chamber and the water intake pipe of the hydraulic machinery are also fixedly connected together by a threaded pair.

[0013] The hydraulic machinery equipment aeration and erosion reduction device also includes a main shaft, one end of which is hinged to the air guide chamber, and the other end of which is fixed to one side of the main baffle, with the other side of the main baffle extending into the aeration chamber.

[0014] The hydraulic machinery equipment aeration and erosion reduction device also includes a secondary deflector shaft. One end of the secondary deflector shaft is hinged to the air guide chamber, and the other end of the secondary deflector shaft is fixedly connected to one side of the secondary baffle. The other side of the secondary baffle extends into the aeration chamber. The main deflector shaft is also fixedly connected to the driving gear. The driving gear and the driven gear mesh with each other. The driven gear is also fixedly connected to the driving pulley. The secondary deflector shaft is also fixedly connected to the driven pulley. The driving pulley and the driven pulley are also connected together by a transmission belt.

[0015] The hydraulic machinery aeration and erosion reduction device also includes an adjusting rod. The surface of the drive gear is also provided with a limiting hole. The drive gear is also fixedly connected to the dial. The surface of the dial is also provided with several positioning holes. One end of the adjusting rod is supported on the surface of the drive gear by a spring. The other end of the adjusting rod extends into at least one positioning hole, and the adjusting rod also passes through the limiting hole.

[0016] The beneficial effects of this invention are as follows: Using the technical solution of this invention, the gas generated by the gas source enters the water inlet pipe of the hydraulic machinery equipment through the gas inlet pipe, the gas guide chamber, and the gas mixing chamber, thereby mixing the gas with the water flow inside the water inlet pipe. This reduces the cavitation impact of the water flow on the hydraulic machinery equipment and extends its service life. Furthermore, if some water flows into the gas mixing device, this portion of water is sent to the counter-current channel through the inlet and undergoes gas mixing treatment within the counter-current channel before being promptly discharged from the outlet. Because the water flowing into the counter-current gas mixing device is promptly mixed with gas, cavitation impact on the internal metal structure of the gas mixing device can be avoided, ensuring stable operation of the gas mixing device and extending its service life. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is the present invention. Figure 1 Axial sectional view; Figure 4 This is the present invention. Figure 3 A magnified view of a section at point I; Figure 5 This is a schematic diagram showing the connection of the float plate, float ball, discharge swing rod, discharge control rope and discharge control block of the present invention; Figure 6 This is a schematic diagram showing the connection of the float plate, float ball, dosage lever, gas control rope and gas control block of the present invention; Figure 7This is a schematic diagram of the connection structure of the main shift shaft, main baffle, auxiliary shift shaft, auxiliary baffle, driving gear, driven gear, driving pulley, driven pulley and transmission belt of the present invention; Figure 8 This is the present invention. Figure 7 A magnified view of section II in the middle.

[0018] In the diagram: 1-Gas-infusing chamber, 2-Gas-guiding chamber, 3-Gas-inlet pipe, 4-Baffle block, 5-Guiding surface, 6-Countercurrent channel, 7-Inlet, 8-Outlet, 9-Gas-injection hole, 10-Discharge swing arm, 11-Gas-infusing swing arm, 12-Discharge control block, 13-Gas control block, 14-Discharge control rope, 15-Gas control rope, 16-Interlocking control chamber, 17-Discharge control trough, 38-Gas control trough, 18-Float plate, 19-Probe 20-Float, 21-Hanging rod, 22-Guide groove, 23-Slider, 24-Fixed pulley, 25-Main shaft, 26-Main baffle, 27-Secondary shaft, 28-Secondary baffle, 29-Driving gear, 30-Driven gear, 31-Driving pulley, 32-Driven pulley, 33-Transmission belt, 34-Adjusting rod, 35-Dial, 36-Positioning hole, 37-Spring, 38-Air control groove. Detailed Implementation

[0019] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0020] like Figures 1 to 8 As shown, the present invention provides an air-entraining corrosion reduction device for hydraulic machinery, including an air-entraining chamber 1 and an air-guiding chamber 2. One side of the air-entraining chamber 1 is connected to the water inlet pipe of the hydraulic machinery, and the other side of the air-entraining chamber 1 is connected to one side of the air-guiding chamber 2. The other side of the air-guiding chamber 2 is connected to one end of the air inlet pipe 3, and the other end of the air inlet pipe 3 is connected to an air source. The air-guiding chamber 2 is also provided with a partition block 4. The top surface of the partition block 4 serves as a flow guiding surface 5, and the bottom surface of the partition block 4 and the bottom surface of the air-guiding chamber 2 surround each other to form a counter-current channel 6. One side of the counter-current channel 6 serves as a water inlet 7, and the other side of the counter-current channel 6 serves as a water outlet 8. The water inlet 7 is close to the air-entraining chamber 1, and the water outlet 8 is close to the air inlet pipe 3. The partition block 4 is also provided with an air-filling hole 9. One end of the air-filling hole 9 is connected to the counter-current channel 6, and the other end of the air-filling hole 9 is connected to the air-guiding chamber 2.

[0021] The technical solution of this invention involves the gas generated by the gas source entering the water inlet pipe of the hydraulic machinery through the gas inlet pipe, the gas guide chamber, and the gas mixing chamber. This gas mixes with the water flow inside the water inlet pipe, thereby reducing the cavitation impact of the water flow on the hydraulic machinery and extending its service life. In addition, if some water flows into the gas mixing device, this portion of water is sent into the countercurrent channel through the inlet and undergoes gas mixing treatment in the countercurrent channel before being discharged from the outlet in a timely manner. Because the water flowing into the countercurrent channel is timely gas-mixed, the cavitation impact on the internal metal structure of the gas mixing device can be avoided, ensuring stable operation of the gas mixing device and extending its service life.

[0022] Specifically, the aeration and erosion reduction device for hydraulic machinery equipment also includes a discharge swing rod 10, a dispensing swing rod 11, a discharge control block 12, an air control block 13, a discharge control rope 14, and an air control rope 15. The partition block 4 also includes a control chamber 16, a discharge control groove 17, and an air control groove 38. One side of the control chamber 16 is connected to one side of the discharge groove 17, and the other side of the discharge groove 17 is connected in parallel with the counter-current channel 6 at the discharge outlet 8. The other side of the control chamber 16 is connected to one side of the air control groove 38, and the other side of the air control groove 38 is connected to the air filling hole 9. The discharge swing rod 10 and the dispensing swing rod... All 11 are hinged in the control chamber 16. The control block 12 is accommodated in the control groove 17, and the control block 13 is accommodated in the control groove 38. The control chamber 16 is also equipped with a float 18. The control block 13 is also hinged to one end of the dosage swing rod 11. One end of the control rope 15 is bolted to the other end of the dosage swing rod 11, and the other end of the control rope 15 is fixed to the float 18. The control block 12 is also fixed to one end of the control rope 14, and the other end of the control rope 14 is bolted to one end of the discharge swing rod 10 and hinged to the other end of the discharge swing rod 10. By adopting the technical solution of the present invention, when the amount of backflow water entering the backflow channel increases, the float plate 18 floats upward, which in turn causes the discharge swing rod 10 and the dosage swing rod 11 to swing. The swing of the discharge swing rod 10 causes the control block 12 to move along the control groove 17, and the swing of the dosage swing rod 11 causes the control block 13 to move along the control groove 38. This simultaneously increases the amount of air added to the backflow water and the amount of water discharged at the drain outlet 8, so that the backflow water can be treated with air in a timely manner and discharged from the air-addressing device in a timely manner. This realizes the synchronous linkage and automatic control of the air-addressing amount and the water discharge amount, and prevents the backflow water from causing cavitation damage to the inside of the air-addressing device.

[0023] In addition, a detection groove 19 is provided inside the partition 4. One side of the detection groove 19 is connected to the control cavity 16, and the other side of the detection groove 19 is connected to the countercurrent channel 6. A float 20 is also provided inside the detection groove 19. The float 20 is fixedly connected to one end of the boom 21, and the other end of the boom 21 is hinged to the float plate 18. Preferably, there are multiple floats 20, which are arranged in a linear array at equal intervals along the length of the float plate 18. Using the technical solution of the present invention, the floats 20 are used to detect the countercurrent water volume in the countercurrent channel and promptly feed back the corresponding countercurrent water volume information to the discharge control block 12 and the air control block 13, so that the air entrainment of the countercurrent water, the discharge volume of the countercurrent water, and the countercurrent water volume in the countercurrent channel change synchronously and in linkage, realizing automatic control.

[0024] In addition, a guide groove 22 is provided inside the partition 4, which communicates with the control cavity 16. A slider 23 is provided inside the guide groove 22, and the slider 23 is also fixedly connected to the float plate 18. A fixed pulley 24 is also hinged inside the control cavity 16, and the control release rope 14 and the control air rope 15 are both wound around the outer circumference of the fixed pulley 24. Using the technical solution of the present invention, the guide groove 22 is used to guide the slider 23, and the fixed pulley 24 is used to guide the control release rope 14 and the control air rope 15.

[0025] In addition, the aeration chamber 1 and the water intake pipe of the hydraulic machinery are also fixedly connected together by a threaded pair. The aeration and erosion reduction device for the hydraulic machinery also includes a main shaft 25, one end of which is hinged to the air intake chamber 2, and the other end of which is fixedly connected to one side of the main baffle 26, the other side of which extends into the aeration chamber 1. Using the technical solution of the present invention, when an operating torque is applied to the main shaft 25 to make it rotate, the main baffle 26 rotates, thereby controlling the air flow between the air intake pipe and the water intake pipe of the hydraulic machinery, and thus adjusting the aeration amount of the water flow inside the hydraulic machinery.

[0026] Specifically, the aeration and erosion reduction device for hydraulic machinery also includes a secondary deflector shaft 27. One end of the secondary deflector shaft 27 is hinged to the air-guiding chamber 2, and the other end of the secondary deflector shaft 27 is fixedly connected to one side of the secondary baffle 28. The other side of the secondary baffle 28 extends into the air-guiding chamber 1. The main deflector shaft 25 is also fixedly connected to the driving gear 29. The driving gear 29 meshes with the driven gear 30, and the driven gear 30 is also fixedly connected to the driving pulley 31. The secondary deflector shaft 27 is also fixedly connected to the driven pulley 32. The driving pulley 31 and the driven pulley 32 are also meshed together through a transmission belt 33. Using the technical solution of this invention, the main baffle 26 and the secondary baffle 28 form a double-door structure, used to regulate and control the airflow between the air intake pipe and the water intake pipe of the hydraulic machinery.

[0027] Furthermore, both the driving pulley 31 and the driven pulley 32 are synchronous pulleys, and the transmission belt 33 is a toothed synchronous belt. The aeration and erosion reduction device for hydraulic machinery also includes an adjusting rod 34. The surface of the driving gear 29 is also provided with a limiting hole. The driving gear 29 is also fixedly connected to the dial 35. The surface of the dial 35 is also provided with several positioning holes 36. One end of the adjusting rod 34 is supported on the surface of the driving gear 29 by a spring 37, and the other end of the adjusting rod 34 extends into at least one positioning hole 36, and the adjusting rod 34 also passes through the limiting hole. There are multiple positioning holes 36, which are distributed in a circumferential array along the edge contour of the dial 35. Using the technical solution of this invention, the structure of the dial 35, adjusting rod 34, and positioning holes 36 is used to adjust the opening degree of the main baffle 26 and the auxiliary baffle 28, thereby regulating and controlling the airflow between the air intake pipe and the water intake pipe of the hydraulic machinery, and regulating the aeration amount of the water flow inside the hydraulic machinery.

Claims

1. An apparatus for erosion reduction by aeration of hydraulic machinery, characterized by: The system includes an air-mixing chamber (1) and an air-guiding chamber (2). One side of the air-mixing chamber (1) is connected to the water intake pipe of the hydraulic machinery equipment, and the other side of the air-mixing chamber (1) is connected to one side of the air-guiding chamber (2). The other side of the air-guiding chamber (2) is connected to one end of an air intake pipe (3), and the other end of the air intake pipe (3) is connected to an air source. The air-guiding chamber (2) is also equipped with a partition (4). The top surface of the partition (4) serves as a flow guiding surface (5), and the bottom surface of the partition (4) is connected to the air-guiding chamber (2). The bottom surface of the structure forms a counter-current channel (6). One side of the counter-current channel (6) is used as the inlet (7), and the other side of the counter-current channel (6) is used as the outlet (8). The inlet (7) is close to the air-injection chamber (1), and the outlet (8) is close to the air intake pipe (3). The partition (4) is also provided with an air filling hole (9). One end of the air filling hole (9) is connected to the counter-current channel (6), and the other end of the air filling hole (9) is connected to the air guide chamber (2).

2. The aεsist device for hydraulic machinery equipment of claim 1, characterized in that: The hydraulic machinery equipment aeration and erosion reduction device also includes a discharge swing rod (10), an aeration swing rod (11), a discharge control block (12), an air control block (13), a discharge control rope (14), and an air control rope (15). The partition block (4) is also provided with a control chamber (16), a discharge control groove (17), and an air control groove (38). One side of the control chamber (16) is connected to one side of the discharge control groove (17), and the other side of the discharge control groove (17) is connected in parallel with the counter-current channel (6) at the discharge outlet (8). The other side of the control chamber (16) is connected to one side of the air control groove (38), and the other side of the air control groove (38) is connected to the air filling hole (9). The discharge swing rod (10) and the aeration swing rod (11) are connected to the discharge control groove (12), the air control block (13), the discharge control rope (14), and the air control rope (15). The measuring rod (11) is hinged in the control cavity (16), the control block (12) is contained in the control groove (17), the control block (13) is contained in the control groove (38), the control cavity (16) is also provided with a float plate (18), the control block (13) is also hinged to one end of the measuring rod (11), one end of the control rope (15) is tied to the other end of the measuring rod (11), the other end of the control rope (15) is fixed to the float plate (18), the control block (12) is also fixed to one end of the control rope (14), the other end of the control rope (14) is tied to one end of the discharge rod (10) and hinged, the other end of the discharge rod (10) is hinged to the float plate (18).

3. The aεsist device for hydraulic machinery of claim 2, wherein: The partition (4) is also provided with a detection groove (19). One side of the detection groove (19) is connected to the control cavity (16), and the other side of the detection groove (19) is connected to the countercurrent channel (6). The detection groove (19) is also provided with a float (20). The float (20) is fixedly connected to one end of the boom (21), and the other end of the boom (21) is hinged to the float plate (18).

4. The apparatus for aerating and erosion-reducing of a hydraulic machinery device according to claim 3, characterized in that: The number of the floats (20) is multiple, and the multiple floats (20) are arranged in a linear array with equal spacing along the length direction of the float plate (18).

5. The apparatus for aerating and erosion-reducing of a hydraulic machinery device according to claim 2, characterized in that: The partition (4) is also provided with a guide groove (22), which is connected to the control cavity (16). The guide groove (22) is provided with a slider (23), which is also fixedly connected to the float (18).

6. The apparatus for aerating and erosion reducing of a hydraulic machinery device according to claim 2, characterized in that: The control chamber (16) is also hinged with a fixed pulley (24), and the control release rope (14) and the control gas rope (15) are both wrapped around the outer circumference of the fixed pulley (24).

7. The apparatus for aerating and erosion-reducing of a hydraulic machinery device according to claim 1, characterized in that: The air-entraining chamber (1) is also connected to the water intake pipe of the hydraulic machinery equipment by a threaded connection.

8. The aεsist device for hydraulic machinery of claim 1, wherein: The hydraulic machinery equipment air-injection erosion reduction device also includes a main shaft (25), one end of which is hinged to the air-guiding chamber (2), and the other end of which is fixed to one side of the main baffle (26), with the other side of the main baffle (26) extending into the air-injection chamber (1).

9. The aεsist device for hydraulic machinery of claim 8, wherein: The hydraulic machinery equipment aeration and corrosion reduction device also includes a secondary deflector shaft (27), one end of which is hinged to the air guide chamber (2), and the other end of which is fixedly connected to one side of the secondary baffle (28). The other side of the secondary baffle (28) extends into the aeration chamber (1). The main deflector shaft (25) is also fixedly connected to the drive gear (29). The drive gear (29) meshes with the driven gear (30). The driven gear (30) is also fixedly connected to the drive pulley (31). The secondary deflector shaft (27) is also fixedly connected to the driven pulley (32). The drive pulley (31) and the driven pulley (32) are also meshed together by a transmission belt (33).

10. The apparatus for aerating and erosion-reducing of a hydraulic machinery device according to claim 9, characterized in that: The hydraulic machinery equipment aeration and corrosion reduction device also includes an adjusting rod (34), the surface of the drive gear (29) is also provided with a limiting hole, the drive gear (29) is also fixedly connected to the dial (35), the surface of the dial (35) is also provided with a number of positioning holes (36), one end of the adjusting rod (34) is supported on the surface of the drive gear (29) by a spring (37), the other end of the adjusting rod (34) extends into at least one positioning hole (36), and the adjusting rod (34) also passes through the limiting hole.

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