A blade angle adjusting device for an axial flow pump and an axial flow pump

Abstract

The present invention relates to the technical field of axial flow pumps, and particularly relates to a blade angle adjustment device for an axial flow pump and an axial flow pump, including a hub. A flow guide cover is fixedly installed at the bottom of the hub, and a fixing frame inserted into the hub is fixed to the top of the inner wall of the flow guide cover. A plurality of first mounting holes are formed at equal intervals in a circular distribution on the circumference of the hub, and the inner walls of the first mounting holes are all connected with steering shafts through sealed bearings. One end of each steering shaft is fixedly installed with a pump blade, and the other end of each steering shaft extending into the hub is fixedly installed with a steering gear. The present invention can flexibly change the angle of the pump blade, enabling the axial flow pump to maintain efficient operation under different flow rate and head requirements. When the angle adjustment is large, the rotation speeds of the crushing shaft and the crushing knives are synchronously increased to fully and quickly crush hard objects such as tree branches, avoiding the influence of some hard objects flowing into the interior of the axial flow pump along with the rapidly flowing water on the safety performance of the pump body.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flow pumps, and specifically discloses a blade angle adjustment device for an axial flow pump and an axial flow pump. Background Art

[0002] An axial flow pump is a type of vane pump that relies on the lifting force generated by the blades of a rotating impeller to transport liquid. Axial flow pumps are generally suitable for occasions with large flow rates and low head, and are commonly found in fields such as agricultural irrigation, urban drainage, and large-scale water conservancy projects. Different operating conditions have significantly different performance requirements for axial flow pumps. For example, in agricultural irrigation, the water requirements of different seasons and crops are different; in industrial production, as the production process changes, the flow rate and head requirements for axial flow pumps are also constantly changing. The performance of axial flow pumps largely depends on the blade angle. Traditional methods for adjusting the blade angle of pumps are mostly manual adjustments, but they rely on manual experience, have low adjustment accuracy, take a long time, and are difficult to meet the needs of real-time changing operating conditions.

[0003] To solve the problem of the disadvantages of manually adjusting the blade angle of axial flow pumps, the adjustable blade angle axial flow pumps in the market adopt a mechanical adjustment design and have a certain market share.

[0004] After retrieval, the invention patent with the authorized announcement number CN114046251B discloses an adjustable blade angle axial flow pump, including a pump body. An adjustable pump water mechanism is movably connected inside the pump body. The adjustable pump water mechanism includes a transmission assembly for transmitting power and a correction assembly for adjusting the blade angle. The transmission assembly is movably connected inside the pump body, and the correction assembly is movably connected outside the transmission assembly; the rotation of the drive shaft causes the impeller to rotate, thereby realizing the power transmission of pumping water. The sliding of the electromagnet causes the connecting rod to rotate, and the rotation of the connecting rod causes the impeller to rotate, thereby realizing the angle adjustment of the impeller, improving the practicability and efficient water pumping of the axial flow pump, and effectively avoiding the shortening of the service life of the impeller due to different water flow environments and water quality changes. At the same time, the cooperation of the positioning block and the card slot improves the stability of the impeller after adjustment. The operation of the motor causes the crushing rod to rotate to crush hard objects such as branches sucked into the axial flow pump during water pumping, improving the safety of the axial flow pump during water pumping.

[0005] Based on the above retrieval and in combination with the existing technology, it is found that the existing axial flow pumps can solve the disadvantages existing in manual adjustment by adjusting the blade angle through a mechanical transmission structure. However, when the blade angle is adjusted to a large extent, the liquid flow rate inside the axial flow pump will increase, and the flow velocity will also increase. The anti-blocking mechanism with a unified speed cannot fully crush hard objects such as branches sucked into the axial flow pump, and some hard objects will flow into the axial flow pump along with the rapidly flowing water, affecting the safety performance of the pump body. Therefore, a blade angle adjustment device for an axial flow pump and an axial flow pump are proposed to improve the above problems. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when the blade angle of the existing axial flow pump is adjusted to a large extent, the liquid flow rate inside the axial flow pump will increase, and the flow velocity will also increase. However, the anti-blocking mechanism with a unified speed cannot fully crush hard objects such as branches sucked by the axial flow pump, and some hard objects will flow into the interior of the axial flow pump along with the rapidly flowing water, affecting the safety performance of the pump body.

[0007] To solve the above problems, the present invention provides a blade angle adjustment device and an axial flow pump for an axial flow pump, including a hub. A guide cover is fixedly installed at the bottom of the hub, and a fixing frame inserted into the hub is fixed to the top inner wall of the guide cover. Equally spaced annularly distributed first mounting holes are formed at the circumference of the hub, and the inner walls of the first mounting holes are all connected to steering shafts through sealed bearings. One end of each steering shaft is fixedly installed with a pump blade, and the other end of the steering shaft extending into the hub is fixedly installed with a steering gear. A hydraulic cylinder is fixedly installed at the bottom of the fixing frame, and a lifting disc is fixedly installed at the piston end of the hydraulic cylinder. Equally spaced annularly distributed L-shaped racks are fixedly installed at the circumference of the lifting disc, and one side of each L-shaped rack is meshed with the outer wall of the steering gear.

[0008] The present invention is further provided that the weight of the lower half of the pump blade is greater than that of the upper half.

[0009] The present invention is further provided that an installation groove is formed at the middle position of the top of the hub, and the cross-section of the installation groove is T-shaped.

[0010] An axial flow pump, which includes a blade angle adjustment device for an axial flow pump, and also includes a pump body. The pump body is assembled from a driver, a water outlet elbow, a guide vane body, and an inlet bellmouth from top to bottom. The driving end of the driver is installed with a pump shaft located at the center position of the guide vane body. The bottom end of the pump shaft is inserted into the middle position of the installation groove, and a positioning ring that fits against the top inner wall of the installation groove is fixed to the outer wall of the bottom of the pump shaft. The bottom end of the pump shaft fits with a positioning disc that fits against the top inner wall of the hub, and the positioning disc, the top of the hub, and the positioning ring are fixed by screwing.

[0011] The present invention is further provided that equally spaced annularly distributed guide vanes are fixedly installed at the bottom inner wall of the guide vane body, and one end of each guide vane is fixedly installed with a guide vane hub sleeved on the outer wall of the pump shaft. A connection groove is formed at the middle position of the bottom of the guide vane hub, and the inner wall of the connection groove is rotationally connected to the outer wall of the pump shaft through a bearing.

[0012] The present invention is further configured such that a first mounting plate is fixedly installed on the inner wall of the water inlet horn at equidistant intervals, and a diversion shell is fixed to one end of the first mounting plate. An anti-blocking mechanism is arranged on the diversion shell in an equidistant annular distribution, and a stepless speed change mechanism for driving the anti-blocking mechanism to work is arranged inside the diversion shell. A traction assembly for driving the stepless speed change mechanism to work is arranged between the inside of the diversion cover and the inside of the diversion shell.

[0013] The present invention is further configured such that the anti-blocking mechanism includes second mounting holes opened on the outer wall of the diversion shell at equidistant intervals, and the inner walls of the second mounting holes are all rotatably connected with mounting shafts through sealed bearings. A crushing shaft is fixedly installed at one end of each mounting shaft, and multiple rows of crushing knives are arranged on the outer wall of the crushing shaft at equidistant intervals.

[0014] The present invention is further configured such that the stepless speed change mechanism includes second mounting plates fixedly arranged on the inner wall of the diversion shell at equidistant intervals, and a gearbox is fixed to one end of the second mounting plates. Two connecting shafts are rotatably connected to the gearbox, and conical shafts located inside the gearbox are respectively installed on the two connecting shafts. The outer walls of the two conical shafts are drivingly connected with the same transmission belt. An activity frame is sleeved on the outer wall of the transmission belt. Through holes for the conical shafts to pass through are respectively opened at both ends of the top of the activity frame. Two rows of rollers are rotatably connected to the middle position of the inner wall of the activity frame at equidistant intervals, and the two rows of rollers are respectively attached to the top surface and the bottom surface of the transmission belt, and the surface of the rollers does not contact the inner wall of the activity frame. A connection hole is opened at the middle position of the top of the diversion shell, and a rotating rod passing through the connection hole is fixed to the middle position of the bottom of the diversion cover. The outer wall of the rotating rod is rotatably connected with the inner wall of the connection hole through a sealed bearing. A first driving gear is fixedly installed at the bottom of the outer wall of the rotating rod, and a second driving gear is fixedly installed at the top of the outer wall of one of the connecting shafts. The second driving gear meshes with the first driving gear. A fixed ring is fixed to the bottom of the gearbox, and an annular bevel gear is rotatably connected to the outer wall of the fixed ring through a bearing. Tooth grooves are opened at equidistant intervals on the bottom of the circumferential inner wall of the annular bevel gear. A third driving gear is fixedly installed at the bottom of the outer wall of the other connecting shaft. The third driving gear meshes with the tooth grooves. Conical gears are fixedly installed at the ends of the mounting shafts extending into the diversion shell, and the outer walls of the conical gears mesh with the outer wall of the annular bevel gear.

[0015] The present invention is further configured such that the two conical shafts are symmetrically distributed about the center of the gearbox, and anti-slip strips are fixedly arranged on the outer walls of the two conical shafts at equidistant intervals.

[0016] The present invention is further configured such that the traction assembly includes a through hole opened at the middle position of the bottom of the air deflector, the center of the rotating rod and the middle position of the top of the gearbox, and a push-pull rod passing through the through hole is fixed at the middle position of the top of the movable frame, the push-pull rod extends to the top of the air deflector and is fixed with a universal ball, a traction rod is fixed at the middle position of the bottom of the lifting plate, and a ball sleeve mounted on the outer wall of the universal ball is fixed to the bottom of the traction rod.

[0017] In summary, after adopting the above structure, the present invention has the following advantages compared with the prior art:

[0018] 1. In the present invention, the lifting plate is driven up and down by a hydraulic cylinder, and the L-shaped rack on the lifting plate is meshed with the steering gear to drive the steering shaft to rotate, thereby realizing the adjustment of the pump blade angle. This design can flexibly change the pump blade angle according to actual working conditions, so that the axial flow pump can maintain efficient operation under different flow and head requirements, thereby improving the adaptability and working efficiency of the axial flow pump.

[0019] 2. In the present invention, the hydraulic cylinder is installed at the bottom of the fixing frame, and the fixing frame is plugged into the impeller hub. The overall structure is compact and space-saving. In addition, the connection method between the various components (such as sealed bearing connection, screw connection, etc.) ensures the stability and reliability of the device, reduces the probability of failure, and extends the service life of the equipment.

[0020] 3. In the present invention, since the weight of the lower part of the pump blade is greater than that of the upper part, the characteristics of the pump blade's own weight are utilized. When installing the L-shaped rack, the pump blade is in the most initial state, which can be synchronized with all the steering gears, so that the steering shaft can run synchronously. When adjusting the angle of the pump blade, this weight distribution helps the pump blade to be more stable during rotation, reduces shaking and vibration, improves the accuracy and stability of adjustment, and also reduces the unbalanced force of the pump blade when rotating at high speed, further improving the running stability of the axial flow pump.

[0021] 4. In the present invention, an anti-blocking mechanism is provided at the water inlet horn, and the debris entering the pump body is crushed by the crushing shaft and the crushing knife, which effectively avoids the problem of debris clogging the pump body and blades, plays a good anti-blocking role, ensures the normal operation of the axial flow pump, and reduces the downtime and maintenance time and cost caused by debris blockage.

[0022] 5. In the present invention, the infinitely variable speed mechanism and the traction assembly can adjust the rotation speed of the crushing shaft according to actual needs, that is, infinitely variable speed is achieved by changing the position of the transmission belt on the two conical shafts. When the angle of the pump vane is adjusted greatly, the liquid flow rate inside the axial flow pump will increase, and the flow velocity will also increase. At this time, the rotation speed of the crushing shaft and the crushing knife will also increase, so as to fully and quickly crush hard objects such as branches entering the axial flow pump, avoiding the influence of some hard objects flowing into the axial flow pump along with the rapidly flowing water on the safety performance of the pump body. And this design can flexibly adjust the crushing strength and speed according to the amount and size of debris in the water source, improving the anti-blocking effect and reducing energy consumption at the same time. For example, when there is less debris, the rotation speed is reduced to reduce energy consumption; when there is more debris, the rotation speed is increased to enhance the crushing ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic perspective view of a vane angle adjustment device for an axial flow pump according to the present invention;

[0024] Figure 2 is a schematic cross-sectional view of a vane angle adjustment device for an axial flow pump according to the present invention;

[0025] Figure 3 is a schematic view of the fixing frame structure of a vane angle adjustment device for an axial flow pump according to the present invention;

[0026] Figure 4 is a schematic perspective view of an axial flow pump according to the present invention;

[0027] Figure 5 is a schematic cross-sectional view of an axial flow pump according to the present invention;

[0028] Figure 6 is a schematic view of the guide vane and crushing knife structure of an axial flow pump according to the present invention;

[0029] Figure 7 is Figure 6 a cross-sectional view of;

[0030] Figure 8 is a schematic view of the first mounting hole and through hole structure of an axial flow pump according to the present invention;

[0031] Figure 9 is a schematic view of the infinitely variable speed mechanism of an axial flow pump according to the present invention;

[0032] Figure 10 is a schematic view of the second mounting hole and third driving gear structure of an axial flow pump according to the present invention;

[0033] Figure 11 is a schematic view of the annular helical gear and tooth groove structure of an axial flow pump according to the present invention;

[0034] Figure 12 This is a schematic diagram of the sliding roller structure of an axial flow pump according to the present invention.

[0035] Description of the reference numerals in the figure:

[0036] 1. Impeller hub; 2. Pump blade; 3. Steering shaft; 4. Deflector; 5. Installation groove; 6. Fixed frame; 7. Hydraulic cylinder; 8. Steering gear; 9. L-shaped rack; 10. Lifting disc; 11. Pump body; 1101. Driver; 1102. Outlet elbow; 1103. Guide vane body; 1104. Inlet bellmouth; 1105. Pump shaft; 12. Guide vane hub; 13. Guide vane; 14. Deflector shell; 15. Crushing shaft; 16. Crushing knife; 17. Towing rod; 18. Ball sleeve; 19. Continuously variable transmission mechanism; 1901. Rotating rod; 1902. First driving gear; 1904. Connecting hole; 1905. Connecting shaft; 1906. Second driving gear; 1907. Gearbox; 1908. Tapered shaft; 1909. Transmission belt; 1910. Movable frame; 1911. Annular bevel gear; 1912. Bevel gear; 1913. Fixed ring; 1914. Third driving gear; 1915. Tooth groove; 1916. Sliding roller; 20. Installation shaft; 21. Connecting groove; 22. Positioning disc; 23. First installation hole; 24. Through hole; 25. Push-pull rod; 26. Universal ball; 27. Second installation hole. Detailed implementation manners

[0037] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connected", "set" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0040] Please refer to Figure 1 - Figure 12 The present invention provides a blade angle adjustment device for an axial flow pump, which includes a hub 1. A flow guide cover 4 is fixedly installed at the bottom of the hub 1, and a fixing frame 6 inserted into the hub 1 is fixed at the top inner wall of the flow guide cover 4. Equally spaced annularly distributed first mounting holes 23 are formed at the circumference of the hub 1, and a steering shaft 3 is connected to the inner wall of each first mounting hole 23 through a sealed bearing. One end of each steering shaft 3 is fixedly installed with a pump blade 2, and the other end of each steering shaft 3 extending into the hub 1 is fixedly installed with a steering gear 8. A hydraulic cylinder 7 is fixedly installed at the bottom of the fixing frame 6, and a lifting disc 10 is fixedly installed at the piston end of the hydraulic cylinder 7. Equally spaced annularly distributed L-shaped racks 9 are fixedly installed at the circumference of the lifting disc 10. One side of each L-shaped rack 9 meshes with the outer wall of the steering gear 8. The weight of the lower half of the pump blade 2 is greater than that of the upper half. An installation groove 5 is formed at the middle position of the top of the hub 1, and the cross-section of the installation groove 5 is T-shaped. By using the above-mentioned hydraulic cylinder 7 and L-shaped racks 9, the piston end of the hydraulic cylinder 7 pushes the lifting disc 10 and the L-shaped racks 9 to move up and down, and the meshing of the L-shaped racks 9 and the steering gears 8 causes the steering gears 8 and the pump blades 2 to rotate, thereby realizing the adjustment of the angles of the pump blades 2. And by controlling the stroke of the piston of the hydraulic cylinder 7, the angle change of the pump blades 2 can be accurately controlled to adapt to different working conditions requirements.

[0041] An axial flow pump, which includes a blade angle adjustment device for an axial flow pump, and further includes a pump body 11. The pump body 11 is assembled from a driver 1101, a water outlet elbow 1102, a guide vane body 1103, and an inlet bellmouth 1104 from top to bottom. And a pump shaft 1105 located at the center position of the guide vane body 1103 is installed at the driving end of the driver 1101. The bottom end of the pump shaft 1105 is inserted into the middle position of the installation groove 5, and a positioning ring fitting on the top inner wall of the installation groove 5 is fixed to the outer wall of the bottom of the pump shaft 1105. The bottom end of the pump shaft 1105 fits with a positioning disc 22 fitting on the top inner wall of the hub 1. The positioning disc 22, the top of the hub 1, and the positioning ring are fixed by screwing, as Figure 4 - Figure 8 shown. The pump shaft 1105 and the hub 1 are fixed by screwing through the installation groove 5, the positioning ring, and the positioning disc 22. The installation process is simple and convenient, and it can ensure the accurate connection and positioning of the pump shaft 1105 and the hub 1, guarantee the effective transmission of power, and reduce the energy loss and equipment damage caused by inaccurate installation.

[0042] In the present invention, guide vanes 13 are fixedly installed at the bottom of the inner wall of the guide vane body 1103 in an equidistant and annular distribution, and one end of each guide vane 13 is fixedly installed with a guide vane hub 12 sleeved on the outer wall of the pump shaft 1105. A connection groove 21 is formed at the middle position of the bottom of the guide vane hub 12, and the inner wall of the connection groove 21 is rotatably connected to the outer wall of the pump shaft 1105 through a bearing, as Figure 5 - Figure 8 shown. By adopting the above-mentioned guide vanes 13 and guide vane hub 12, the guide vanes 13 can guide the water flow, enabling the water flow to flow out of the pump body more smoothly, reducing the vortices and turbulences of the water flow, improving the hydraulic efficiency of the axial flow pump, and at the same time reducing the impact of the water flow on the pump body and extending the service life of the pump body.

[0043] In the present invention, first mounting plates are fixedly installed on the inner wall of the water inlet horn 1104 at equidistant intervals, and a same diversion shell 14 is fixed at one end of the first mounting plates. An anti-blocking mechanism is arranged on the diversion shell 14 in an equidistant annular distribution, and a stepless speed change mechanism 19 for driving the anti-blocking mechanism to work is arranged inside the diversion shell 14. A traction assembly for driving the stepless speed change mechanism 19 to work is arranged between the inside of the diversion cover 4 and the inside of the diversion shell 14. The anti-blocking mechanism includes second mounting holes 27 opened on the outer wall of the diversion shell 14 at equidistant intervals. The inner walls of the second mounting holes 27 are all rotatably connected with mounting shafts 20 through sealed bearings. One end of each mounting shaft 20 is fixedly installed with a crushing shaft 15. Multiple columns of crushing knives 16 are installed on the outer wall of the crushing shaft 15 at equidistant intervals. The stepless speed change mechanism 19 includes second mounting plates fixedly arranged on the inner wall of the diversion shell 14 at equidistant intervals, and a same gearbox 1907 is fixed at one end of the second mounting plates. Two connecting shafts 1905 are rotatably connected to the gearbox 1907. Tapered shafts 1908 located inside the gearbox 1907 are respectively installed on the two connecting shafts 1905. The outer walls of the two tapered shafts 1908 are drivingly connected with a same transmission belt 1909. An activity frame 1910 is sleeved on the outer wall of the transmission belt 1909. Circular holes for the tapered shafts 1908 to pass through are respectively opened at both ends of the top of the activity frame 1910. Two columns of equidistant sliding rollers 1916 are rotatably connected to the middle position of the inner wall of the activity frame 1910, and the two columns of sliding rollers 1916 are respectively attached to the top surface and the bottom surface of the transmission belt 1909. The surface of the sliding rollers 1916 does not contact the inner wall of the activity frame 1910. A connection hole 1904 is opened at the middle position of the top of the diversion shell 14, and a rotating rod 1901 passing through the connection hole 1904 is fixed at the middle position of the bottom of the diversion cover 4. The outer wall of the rotating rod 1901 is rotatably connected with the inner wall of the connection hole 1904 through a sealed bearing. A first driving gear 1902 is fixedly installed at the bottom of the outer wall of the rotating rod 1901. A second driving gear 1906 is fixedly installed at the top of the outer wall of one of the connecting shafts 1905. The second driving gear 1906 meshes with the first driving gear 1902. A fixed ring 1913 is fixed at the bottom of the gearbox 1907, and an annular bevel gear 1911 is rotatably connected to the outer wall of the fixed ring 1913 through a bearing. Tooth grooves 1915 are opened at equidistant intervals at the bottom of the circumferential inner wall of the annular bevel gear 1911. A third driving gear 1914 is fixedly installed at the bottom of the outer wall of the other connecting shaft 1905. The third driving gear 1914 meshes with the tooth grooves 1915. A bevel gear 1912 is fixedly installed at one end of each mounting shaft 20 extending into the diversion shell 14, and the outer wall of the bevel gear 1912 meshes with the outer wall of the annular bevel gear 1911. The traction assembly includes through holes 24 opened at the middle position of the bottom of the diversion cover 4, the center of the rotating rod 1901, and the middle position of the top of the gearbox 1907. A push-pull rod 25 passing through the through hole 24 is fixed at the middle position of the top of the activity frame 1910. A universal ball 26 is fixed at the top of the push-pull rod 25 extending into the diversion cover 4.A traction rod 17 is fixed at the middle position of the bottom of the lifting disc 10, and a ball sleeve 18 sleeving the outer wall of the universal ball 26 is fixed at the bottom of the traction rod 17. For example, Figure 5 - Figure 12 As shown, by adopting the above stepless speed change mechanism 19 and anti-blocking mechanism, when the impeller hub 1 and the fairing 4 rotate, the rotating rod 1901 in the stepless speed change mechanism 19 rotates therewith, driving the connecting shaft 1905 and the tapered shaft 1908 to rotate. Power transmission is realized through the transmission belt 1909. At this time, another tapered shaft 1908, another connecting shaft 1905 and the third driving gear 1914 rotate. With the meshing action of the third driving gear 1914 with the tooth groove 1915 and the annular helical gear 1911 with the bevel gear 1912, power is transmitted to the mounting shaft 20, driving the mounting shaft 20, the crushing shaft 15 and the crushing knife 16 to rotate synchronously, so as to crush the sundries entering the axial flow pump, prevent the sundries from blocking the pump body and the blades, and by adopting the above stepless speed change mechanism 19 and the traction assembly, when the angle of the pump blade 2 changes, the traction rod 17 and the ball sleeve 18 in the traction assembly will move along with the movement of the L-shaped rack 9. At this time, it will drive the push-pull rod 25, the movable frame 1910 and the two rows of sliding rollers 1916 to move synchronously, driving the position of the transmission belt 1909 on the two tapered shafts 1908 to change. The change of the position of the transmission belt 1909 will cause the transmission ratio to change, realizing stepless speed change. Thus, when the angle of the pump blade 2 is larger, the rotating speed of the crushing shaft 15 and the crushing knife 16 is increased, and the hard objects such as branches entering the axial flow pump are fully and quickly crushed, avoiding some hard objects flowing into the interior of the axial flow pump along with the rapidly flowing water and affecting the safety performance of the pump body.

[0044] In the present invention, the two tapered shafts 1908 are symmetrically distributed about the center of the gearbox 1907, and anti-slip strips are fixedly arranged on the outer walls of the two tapered shafts 1908 at equal intervals. As Figure 10 shown, by adopting the above anti-slip strips, it can be ensured that the two tapered shafts 1908 can rotate simultaneously under the action of the same transmission belt 1909, ensuring the transmission force.

[0045] To sum up, the working principle of the present invention is as follows: After the driver 1101 in the pump body 11 is started, its driving end drives the pump shaft 1105 to rotate, driving the impeller hub 1 and the pump blade 2 to rotate together. When the pump blade 2 rotates, it generates a lifting force on the liquid entering the inlet bell 1104, enabling the liquid to obtain energy and flow axially. The liquid enters the diffuser 1103 after passing through the pump blade 2. The guide vanes 13 and the diffuser hub 12 in the diffuser 1103 play a role in guiding the water flow, making the water flow more stable, reducing vortices and turbulences. Finally, the liquid is discharged from the pump body through the outlet elbow 1102;

[0046] When it is necessary to adjust the angle of the pump vane 2, the hydraulic cylinder 7 installed at the bottom of the fixed frame 6 starts to work. The piston end of the hydraulic cylinder 7 pushes the lifting disc 10 and the L-shaped rack 9 to move up and down. Through the meshing of the L-shaped rack 9 and the steering gear 8, the steering gear 8 and the pump vane 2 are driven to rotate, thereby realizing the adjustment of the angle of the pump vane 2. By controlling the stroke of the piston of the hydraulic cylinder 7, the angle change of the pump vane 2 can be accurately controlled to meet the requirements of different working conditions.

[0047] When the impeller hub 1 and the fairing 4 rotate, the rotating rod 1901 in the stepless speed change mechanism 19 rotates accordingly. The first driving gear 1902 on the rotating rod 1901 meshes with the second driving gear 1906 on one of the connecting shafts 1905, driving the connecting shaft 1905 to rotate. The tapered shaft 1908 on the connecting shaft 1905 realizes power transmission through the transmission belt 1909. At this time, the other tapered shaft 1908, the other connecting shaft 1905, and the third driving gear 1914 rotate. With the meshing of the third driving gear 1914 with the tooth groove 1915 and the meshing of the annular bevel gear 1911 with the bevel gear 1912, the power is transmitted to the mounting shaft 20, driving the mounting shaft 20, the crushing shaft 15, and the crushing knife 16 to rotate synchronously, thereby crushing the sundries entering the axial flow pump and preventing the sundries from blocking the pump body and the vanes.

[0048] When the angle of the pump vane 2 changes, the towing rod 17 and the ball sleeve 18 in the towing assembly will move along with the movement of the L-shaped rack 9. At this time, the push-pull rod 25 and the movable frame 1910 will be driven to move synchronously. When the movable frame 1910 moves, the position of the transmission belt 1909 on the two tapered shafts 1908 changes. Since the two tapered shafts 1908 are tapered structures, the change in the position of the transmission belt 1909 will cause the transmission ratio to change, thereby realizing stepless speed change. When the angle of the pump vane 2 is larger, the liquid flow rate inside the axial flow pump will increase, and the flow velocity will also increase. At this time, the rotation speed of the crushing shaft 15 and the crushing knife 16 will also increase, so as to fully and quickly crush hard objects such as branches entering the axial flow pump, avoiding the influence of some hard objects flowing into the axial flow pump along with the rapidly flowing water on the safety performance of the pump body.

[0049] Combined with the current actual needs, the above-mentioned implementation method adopted in this application, the protection scope is not limited to this. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. An axial flow pump, comprising an impeller hub (1) and a water inlet horn (1104), characterized in that: A guide cover (4) is fixedly mounted on the bottom of the impeller hub (1), and a fixing frame (6) inserted into the impeller hub (1) is fixedly mounted on the top of the inner wall of the guide cover (4). First mounting holes (23) are arranged at equal distances and in an annular pattern on the circumference of the impeller hub (1), and the inner walls of the first mounting holes (23) are connected to steering shafts (3) via sealed bearings. Pump blades (2) are fixedly mounted on one end of the steering shaft (3), and a steering gear (8) is fixedly mounted on the other end of the steering shaft (3) extending into the impeller hub (1). A hydraulic cylinder (7) is fixedly mounted on the bottom of the fixing frame (6), and a lifting plate (10) is fixedly mounted on the piston end of the hydraulic cylinder (7). The lifting plate (10) is fixedly mounted with a plurality of first mounting holes (23) arranged at equal distances and in an annular pattern. An L-shaped rack (9) is arranged in an annular shape, one side of the L-shaped rack (9) is meshed with the outer wall of the steering gear (8), the inner wall of the water inlet horn (1104) is fixedly mounted with a first mounting plate which is arranged at an equal distance, and one end of the first mounting plate is fixed with a same guide shell (14), the guide shell (14) is provided with an anti-blocking mechanism which is arranged in an annular shape at an equal distance, and the inside of the guide shell (14) is provided with a continuously variable transmission mechanism (19) for driving the anti-blocking mechanism to work, the continuously variable transmission mechanism (19) comprises a second mounting plate which is fixed at an equal distance to the inner wall of the guide shell (14), and one end of the second mounting plate is fixed with a same gearbox (1907), the gearbox (1907) is rotatably connected with two connecting shafts (1905), the two connecting shafts (1905) are connected to the gearbox (1907), and the two connecting shafts (1905) are connected to the gearbox (1907). The two connecting shafts (1905) are respectively mounted with conical shafts (1908) located in the gearbox (1907); the outer walls of the two conical shafts (1908) are transmission-connected with the same transmission belt (1909); the outer wall of the transmission belt (1909) is sleeved with a movable frame (1910); both ends of the top of the movable frame (1910) are penetrated with round holes for the conical shaft (1908) to pass through; the middle position of the inner wall of the movable frame (1910) is rotationally connected with two rows of equally spaced rollers (1916); the two rows of rollers (1916) are respectively attached to the top and bottom surfaces of the transmission belt (1909); the surface of the roller (1916) does not contact the inner wall of the movable frame (1910); the middle position of the top of the guide shell (14) A connecting hole (1904) is provided, and a rotating rod (1901) passing through the connecting hole (1904) is fixed at the middle position of the bottom of the air deflector (4); the outer wall of the rotating rod (1901) is rotatably connected to the inner wall of the connecting hole (1904) via a sealed bearing; a first driving gear (1902) is fixedly installed at the bottom of the outer wall of the rotating rod (1901); a second driving gear (1906) is fixedly installed at the top of the outer wall of one of the connecting shafts (1905); the second driving gear (1906) is meshed with the first driving gear (1902); a fixing ring (1913) is fixed at the bottom of the gearbox (1907); and the outer wall of the fixing ring (1913) is rotatably connected to a ring-shaped bevel gear (1911) via a bearing.The bottom of the circumferential inner wall of the annular bevel gear (1911) is provided with tooth grooves (1915) distributed at equal distances. A third driving gear (1914) is fixedly installed at the bottom of the outer wall of the other connecting shaft (1905), and the third driving gear (1914) is meshed with the tooth groove (1915). The end of the installation shaft (20) of the anti-blocking mechanism extending into the guide housing (14) is fixedly installed with a bevel gear (1912), and the outer wall of the bevel gear (1912) is meshed with the outer wall of the annular bevel gear (1911). The interior of the guide cover (4) and the interior of the guide housing (14) are provided with a gear for driving the continuously variable transmission. A traction assembly for the mechanism (19) to work, the traction assembly comprising a through hole (24) opened at the middle position of the bottom of the air deflector (4), the center of the rotating rod (1901) and the middle position of the top of the gearbox (1907), a push-pull rod (25) passing through the through hole (24) is fixed at the middle position of the top of the movable frame (1910), a universal ball (26) is fixed at the top of the push-pull rod (25) extending into the air deflector (4), a traction rod (17) is fixed at the middle position of the bottom of the lifting plate (10), and a ball sleeve (18) sleeved on the outer wall of the universal ball (26) is fixed at the bottom of the traction rod (17).

2. An axial flow pump according to claim 1, characterized in that: The weight of the lower half of the pump blade (2) is greater than the weight of the upper half.

3. An axial flow pump according to claim 2, characterized in that: A mounting groove (5) is provided at the middle position of the top of the impeller hub (1), and the cross section of the mounting groove (5) is T-shaped.

4. An axial flow pump according to claim 3, characterized in that: The invention also comprises a pump body (11), wherein the pump body (11) is assembled from a top-down driver (1101), a water outlet elbow (1102) and a guide vane body (1103), and a driving end of the driver (1101) is mounted with a pump shaft (1105) located at the center of the guide vane body (1103), the bottom end of the pump shaft (1105) is inserted into the middle position of the mounting groove (5), and a positioning ring is fixed to the bottom of the outer wall of the pump shaft (1105) and is fitted to the top of the inner wall of the mounting groove (5), and a positioning plate (22) is fitted to the inner wall of the top of the impeller hub (1) at the bottom end of the pump shaft (1105), and the positioning plate (22), the top of the impeller hub (1) and the positioning ring are fixed by screw connection.

5. An axial flow pump according to claim 4, characterized in that: The bottom of the inner wall of the guide vane body (1103) is fixedly mounted with guide vanes (13) distributed in an annular shape at equal distances, and one end of the guide vane (13) is fixedly mounted with a guide vane hub (12) sleeved on the outer wall of the pump shaft (1105), a connecting groove (21) is provided at the middle position of the bottom of the guide vane hub (12), and the inner wall of the connecting groove (21) is rotatably connected to the outer wall of the pump shaft (1105) via a bearing.

6. An axial flow pump according to claim 5, characterized in that: The anti-blocking mechanism comprises second mounting holes (27) which are equidistantly arranged on the outer wall of the guide shell (14), and the inner walls of the second mounting holes (27) are rotatably connected to mounting shafts (20) via sealed bearings, one end of the mounting shafts (20) is fixedly mounted with a crushing shaft (15), and the outer wall of the crushing shaft (15) is mounted with a plurality of rows of crushing knives (16) which are equidistantly distributed.

7. An axial flow pump according to claim 6, characterized in that: The two tapered shafts (1908) are centrally symmetrically distributed along the center of the gearbox (1907), and anti-slip strips distributed at equal distances are fixed to the outer walls of the two tapered shafts (1908).

Images