Blade angle adjusting device for axial flow pump and axial flow pump

Abstract

The invention relates to the technical field of axial flow pumps, in particular to a blade angle adjusting device for an axial flow pump and the axial flow pump. The blade angle adjusting device comprises an impeller hub, a flow guide cover is fixedly installed at the bottom of the impeller hub, and a fixing frame inserted into the impeller hub is fixed to the top of the inner wall of the flow guide cover; first mounting holes which are annularly distributed at equal intervals are formed in the circumference of the impeller hub, the inner walls of the first mounting holes are connected with steering shafts through sealing bearings, pump blades are fixedly mounted at one ends of the steering shafts, and steering gears are fixedly mounted at the other ends, extending into the impeller hub, of the steering shafts. According to the axial flow pump, the angles of the pump blades can be flexibly changed, the axial flow pump can operate efficiently under different flow and lift requirements, when the angles are adjusted to be large, the rotating speed of the smashing shaft and the rotating speed of the smashing cutter are synchronously increased, hard objects such as branches are sufficiently and rapidly smashed, and the service life of the smashing cutter is prolonged. And hard objects are prevented from flowing into the axial flow pump along with quickly circulating water to influence the safety performance of the pump body.

Description

Technical Field

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

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

[0003] In order to solve the problem of manual adjustment of the blade angle of the axial flow pump, the blade adjustable angle axial flow pump on the market adopts a mechanical adjustment design and has a certain market share.

[0004] After searching, the invention patent with authorization announcement number CN114046251B discloses an axial flow pump with adjustable blade angle, including a pump body, wherein the pump body is internally movably connected with an adjustable water pumping mechanism, wherein the adjustable water pumping mechanism includes a transmission component for transmitting power and a correction component for adjusting the blade angle, wherein the transmission component is movably connected inside the pump body, and the correction component is movably connected outside the transmission component; the impeller is rotated by rotating the transmission shaft, 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, thereby improving the practicality and efficient water pumping of the axial flow pump, and effectively avoiding shortening the service life of the impeller due to different water flow environments and water quality changes, while the positioning block and the card slot cooperate to improve the stability of the impeller after adjustment, and the operation of the motor causes the crushing rod to rotate to crush hard objects such as branches sucked into the water pumped by the axial flow pump, thereby improving the safety of the axial flow pump in pumping water.

[0005] Based on the above search and in combination with the prior art, it is found that the existing axial flow pump can solve the drawbacks of manual adjustment by adjusting the blade angle through a mechanical transmission structure. However, when the blade angle is adjusted to a larger value, the liquid flow rate inside the axial flow pump will increase, and the flow rate will also increase. The anti-blocking mechanism with a uniform speed cannot fully crush the hard objects such as branches sucked into the axial flow pump. Some hard objects will flow into the axial flow pump along with the rapidly circulating water, affecting the safety performance of the pump body. Therefore, a blade angle adjustment device and an axial flow pump for 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 larger value, the liquid flow rate inside the axial flow pump will increase, and the flow rate will also increase. However, the anti-blocking mechanism with a uniform speed cannot fully crush the hard objects such as branches sucked into the axial flow pump. Some hard objects will flow into the interior of the axial flow pump along with the rapidly circulating water, affecting the safety performance of the pump body.

[0007] To solve the above problems, the present invention provides a blade angle adjustment device for an axial flow pump and an axial flow pump, comprising an impeller hub, a guide cover is fixedly installed at the bottom of the impeller hub, and a fixing frame inserted into the impeller hub is fixed on the top of the inner wall of the guide cover, and the circumference of the impeller hub is provided with first mounting holes distributed in an annular shape at equal distances, and the inner walls of the first mounting holes are connected to steering shafts through sealed bearings, one end of the steering shaft is fixedly installed with pump blades, and the other end of the steering shaft extending into the impeller hub is fixedly installed with a steering gear, a hydraulic cylinder is fixedly installed at the bottom of the fixing frame, and a lifting plate is fixedly installed on the piston end of the hydraulic cylinder, and L-shaped racks distributed in an annular shape at equal distances are fixedly installed on the circumference of the lifting plate, and one side of the L-shaped rack is meshed with the outer wall of the steering gear.

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

[0009] The present invention is further configured such that a mounting groove is provided at a middle position on the top of the impeller hub, and a cross section of the mounting groove is T-shaped.

[0010] An axial flow pump includes a blade angle adjustment device for the axial flow pump and a pump body. The pump body is assembled from a top-down driver, a water outlet elbow, a guide vane body and a water inlet horn, and the driving end of the driver is installed with a pump shaft located at the center of the guide vane body, the bottom end of the pump shaft is inserted in the middle position of the mounting groove, and a positioning ring is fixed to the bottom of the outer wall of the pump shaft and fits the top of the inner wall of the mounting groove, and the bottom end of the pump shaft is fitted with a positioning disk that fits the inner wall of the top of the impeller hub, and the positioning disk, the top of the impeller hub and the positioning ring are fixed by screw connection.

[0011] The present invention is further configured such that guide vanes equidistantly distributed in a ring shape are fixedly mounted on the bottom of the inner wall of the guide vane body, and a guide vane hub sleeved on the outer wall of the pump shaft is fixedly mounted on one end of the guide vane, a connecting groove is provided in the middle position of the bottom of the guide vane hub, and the inner wall of the connecting groove is rotatably 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 distributed at equal distances is fixedly mounted on the inner wall of the water inlet horn, and a same guide shell is fixed to one end of the first mounting plate, an anti-blocking mechanism distributed in an annular shape at equal distances is provided on the guide shell, and a continuously variable speed change mechanism for driving the anti-blocking mechanism is provided inside the guide shell, and a traction assembly for driving the continuously variable speed change mechanism is provided inside the guide cover and the guide shell.

[0013] The present invention is further configured such that the anti-blocking mechanism includes second mounting holes equidistantly arranged on the outer wall of the guide shell, and the inner walls of the second mounting holes are rotatably connected to mounting shafts via sealed bearings, a crushing shaft is fixedly mounted on one end of the mounting shaft, and a plurality of rows of crushing knives equidistantly distributed are mounted on the outer wall of the crushing shaft.

[0014] The present invention is further configured as follows: the continuously variable transmission mechanism includes a second mounting plate fixed at an equal distance to the inner wall of the deflector shell, and one end of the second mounting plate is fixed with a same gearbox, the gearbox is rotatably connected to two connecting shafts, the two connecting shafts are respectively mounted with tapered shafts located in the gearbox, the outer walls of the two tapered shafts are transmission-connected to the same transmission belt, the outer wall of the transmission belt is sleeved with a movable frame, both ends of the top of the movable frame are penetrated with round holes for the tapered shaft to pass through, two rows of equally distributed sliding rollers are rotatably connected to the middle position of the inner wall of the movable frame, and the two rows of sliding rollers are respectively attached to the top and bottom surfaces of the transmission belt, and the surfaces of the sliding rollers do not contact the inner wall of the movable frame, a connecting hole is opened in the middle position of the top of the deflector shell, and the middle of the bottom of the deflector cover A rotating rod passing through a connecting hole is fixed in position, and the outer wall of the rotating rod is rotatably connected to the inner wall of the connecting hole through a sealed bearing, a first driving gear is fixedly installed on the bottom of the outer wall of the rotating rod, a second driving gear is fixedly installed on the top of the outer wall of one of the connecting shafts, and the second driving gear is meshed with the first driving gear, a fixing ring is fixed at the bottom of the gearbox, and an annular bevel gear is rotatably connected to the outer wall of the fixing ring through a bearing, and the bottom of the circumferential inner wall of the annular bevel gear is provided with tooth grooves distributed at equal distances, a third driving gear is fixedly installed on the bottom of the outer wall of the other connecting shaft, and the third driving gear is meshed with the tooth groove, and a bevel gear is fixedly installed on one end of the installation shaft extending into the guide housing, and the outer wall of the bevel gear is meshed with the outer wall of the annular bevel gear.

[0015] The present invention is further configured such that the two tapered shafts are centrally symmetrically distributed along the center of the gearbox, and anti-slip strips distributed at equal distances are fixed to the outer walls of the two tapered shafts.

[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: 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 5. In the present invention, the rotation speed of the crushing shaft can be adjusted according to actual needs through the stepless speed change mechanism and the traction assembly, that is, the stepless speed change is achieved by changing the position of the transmission belt on the two tapered shafts. When the angle of the pump blade is adjusted to a large extent, the liquid flow rate inside the axial flow pump will increase, and the flow rate will also increase. At this time, the rotation speed of the crushing shaft and the crushing knife will also increase, so that the hard objects such as branches entering the axial flow pump can be fully and quickly crushed, and some hard objects can be prevented from flowing into the axial flow pump with the fast-circulating water to affect the safety performance of the pump body. In addition, this design can flexibly adjust the crushing force and speed according to the amount and size of the debris in the water source, thereby improving the anti-blocking effect and reducing energy consumption. For example, when there are fewer debris, the rotation speed can be reduced to reduce energy consumption; when there are more debris, the rotation speed can be increased to enhance the crushing ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a blade angle adjustment device for an axial flow pump of the present invention; Figure 2 It is a three-dimensional cross-sectional view of a blade angle adjustment device for an axial flow pump of the present invention; Figure 3 It is a schematic diagram of the structure of a fixing frame of a blade angle adjustment device for an axial flow pump according to the present invention; Figure 4 It is a three-dimensional structural schematic diagram of an axial flow pump of the present invention; Figure 5 It is a three-dimensional cross-sectional view of an axial flow pump of the present invention; Figure 6 This is a schematic diagram of the structure of a guide vane and a crushing knife of an axial flow pump of the present invention; Figure 7 for Figure 6 A cross-sectional view of Figure 8 This is a schematic diagram of the first mounting hole and through hole structure of an axial flow pump of the present invention; Fig. 9 It is a structural schematic diagram of a continuously variable speed mechanism of an axial flow pump of the present invention; Fig.10 This is a schematic diagram of the second mounting hole and the third driving gear structure of an axial flow pump of the present invention; Fig.11 This is a schematic diagram of the annular helical gear and tooth groove structure of an axial flow pump of the present invention; Fig.12 The figure is a schematic diagram of the sliding roller structure of an axial flow pump of the present invention.

[0023] Description of the numbers in the figure: 1. Impeller hub; 2. Pump blades; 3. Steering shaft; 4. Guide cover; 5. Mounting slot; 6. Fixed frame; 7. Hydraulic cylinder; 8. Steering gear; 9. L-shaped rack; 10. Lifting plate; 11. Pump body; 1101. Driver; 1102. Outlet elbow; 1103. Guide vane body; 1104. Inlet horn; 1105. Pump shaft; 12. Guide vane hub; 13. Guide vane; 14. Guide shell; 15. Crushing shaft; 16. Crushing knife; 17. Drawbar; 18. Ball sleeve; 19. Continuously variable transmission mechanism; 1901. Rotating rod; 1902. The first driving gear; 1904, connecting hole; 1905, connecting shaft; 1906, the second driving gear; 1907, the gearbox; 1908, the tapered shaft; 1909, the transmission belt; 1910, the movable frame; 1911, the annular bevel gear; 1912, the bevel gear; 1913, the fixing ring; 1914, the third driving gear; 1915, the tooth groove; 1916, the sliding roller; 20, the mounting shaft; 21, the connecting groove; 22, the positioning plate; 23, the first mounting hole; 24, the through hole; 25, the push-pull rod; 26, the universal ball; 27, the second mounting hole. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] See also Figure 1 - Fig.12The present invention provides a blade angle adjustment device for an axial flow pump, comprising an impeller hub 1, a guide cover 4 is fixedly installed at the bottom of the impeller hub 1, and a fixing frame 6 inserted into the impeller hub 1 is fixedly installed on the top of the inner wall of the guide cover 4, and the impeller hub 1 is provided with first mounting holes 23 distributed in an annular shape with equal distances at the circumference, and the inner walls of the first mounting holes 23 are connected with steering shafts 3 through sealed bearings, one end of the steering shaft 3 is fixedly installed with pump blades 2, and the other end of the steering shaft 3 extending into the impeller 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 plate 10 is fixedly installed on the piston end of the hydraulic cylinder 7, and a lifting plate 10 is fixedly installed at the circumference of the lifting plate 10 It is equipped with L-shaped racks 9 which are equidistantly distributed in a ring shape, one side of the L-shaped racks 9 is meshed with the outer wall of the steering gear 8, the weight of the lower half of the pump blade 2 is greater than the weight of the upper half, a mounting groove 5 is provided in the middle of the top of the impeller hub 1, and the cross section of the mounting groove 5 is T-shaped, and the above-mentioned hydraulic cylinder 7 and L-shaped rack 9 are used, and the lifting plate 10 and the L-shaped rack 9 are pushed up and down by the piston end of the hydraulic cylinder 7, and the steering gear 8 and the pump blade 2 are caused to rotate through the meshing L-shaped rack 9 and the steering gear 8, thereby realizing the adjustment of the angle of the pump blade 2, and the angle change of the pump blade 2 can be accurately controlled by controlling the stroke of the piston of the hydraulic cylinder 7 to adapt to different working conditions.

[0028] An axial flow pump, the axial flow pump includes a blade angle adjustment device for the axial flow pump, and also includes a pump body 11, the pump body 11 is assembled from top to bottom by a driver 1101, a water outlet elbow 1102, a guide vane body 1103 and a water inlet horn 1104, and the driving end of the driver 1101 is installed 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 in the middle position of the installation groove 5, and the bottom of the outer wall of the pump shaft 1105 is fixed with a positioning ring that fits on the top of the inner wall of the installation groove 5, the bottom end of the pump shaft 1105 is fitted with a positioning plate 22 that fits on the top inner wall of the impeller hub 1, the positioning plate 22, the top of the impeller hub 1 and the positioning ring are fixed by screw connection, such as Figure 4 - Figure 8 As shown, the pump shaft 1105 and the impeller hub 1 are fixed by screwing through the mounting groove 5, the positioning ring and the positioning plate 22. The installation process is simple and convenient, and can ensure the accurate connection and positioning of the pump shaft 1105 and the impeller hub 1, thereby ensuring the effective transmission of power and reducing energy loss and equipment damage caused by inaccurate installation.

[0029] In the present invention, the inner wall bottom of the guide vane body 1103 is fixedly installed with guide vanes 13 that are equidistantly distributed in an annular shape, and one end of the guide vane 13 is fixedly installed with a guide vane hub 12 that is sleeved on the outer wall of the pump shaft 1105. A connecting groove 21 is opened in the middle of the bottom of the guide vane hub 12. The inner wall of the connecting groove 21 is rotatably connected to the outer wall of the pump shaft 1105 through a bearing, such as Figure 5- Figure 8 As shown, by using the above-mentioned guide vane 13 and guide vane hub 12, the guide vane 13 can guide the water flow, so that the water flow flows out of the pump body more smoothly, the vortex and turbulence of the water flow are reduced, the hydraulic efficiency of the axial flow pump is improved, and the impact of the water flow on the pump body is also reduced, thereby extending the service life of the pump body.

[0030] In the present invention, the inner wall of the water inlet horn 1104 is fixedly installed with a first mounting plate distributed at an equal distance, and one end of the first mounting plate is fixed with the same guide shell 14, the guide shell 14 is provided with an anti-blocking mechanism distributed in an annular shape at an equal distance, and the interior of the guide shell 14 is provided with a continuously variable transmission mechanism 19 for driving the anti-blocking mechanism to work, the interior of the guide cover 4 and the interior of the guide shell 14 are provided with a traction component for driving the continuously variable transmission mechanism 19 to work, the anti-blocking mechanism includes a second mounting hole 27 equidistantly opened on the outer wall of the guide shell 14, and the inner wall of the second mounting hole 27 is rotatably connected with a mounting shaft 20 through a sealed bearing, one end of the mounting shaft 20 is fixedly installed with a crushing shaft 15, and the outer wall of the crushing shaft 15 is provided with a plurality of rows of crushing knives 16 distributed at equal distances. The continuously variable transmission mechanism 19 includes a second mounting plate fixed at an equal distance on the inner wall of the guide housing 14, and a same gearbox 1907 is fixed at one end of the second mounting plate, and two connecting shafts 1905 are rotatably connected to the gearbox 1907, and conical shafts 1908 located in the gearbox 1907 are respectively installed on the two connecting shafts 1905, and the outer walls of the two conical shafts 1908 are connected to the same transmission belt 1909 for transmission, and the outer wall of the transmission belt 1909 is sleeved with a movable frame 1910, and circular holes for the conical shaft 1908 to pass through are opened at both ends of the top of the movable frame 1910, and two rows of sliding rollers 1916 distributed at equal distances are rotatably connected to the middle position of the inner wall of the movable frame 1910, and the two rows of sliding rollers 1916 are respectively attached to the top surface of the transmission belt 1909 and bottom surface, the surface of the sliding roller 1916 does not contact the inner wall of the movable frame 1910, a connecting hole 1904 is opened in the middle position of the top of the deflector shell 14, and a rotating rod 1901 passing through the connecting hole 1904 is fixed in the middle position of the bottom of the deflector cover 4, the outer wall of the rotating rod 1901 is rotatably connected to the inner wall of the connecting 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, and 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 the annular bevel gear 191 through a bearing. 1. 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 another connecting shaft 1905, and the third driving gear 1914 is meshed with the tooth groove 1915. A bevel gear 1912 is fixedly installed at one end of the mounting shaft 20 extending into the deflector shell 14, and the outer wall of the bevel gear 1912 is meshed with the outer wall of the annular bevel gear 1911. The traction assembly includes a through hole 24 provided at the middle position of the bottom of the deflector 4, the center of the rotating rod 1901 and the middle position of the top of the gearbox 1907, and 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, and a universal ball 26 is fixed to the top of the push-pull rod 25 extending to the 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 is fixed at the bottom of the traction rod 17 and is sleeved on the outer wall of the universal ball 26, such as: Figure 5 - Fig.12 As shown, by using the above-mentioned continuously variable transmission mechanism 19 and anti-blocking mechanism, when the impeller hub 1 and the deflector 4 rotate, the rotating rod 1901 in the continuously variable transmission mechanism 19 rotates together, driving the connecting shaft 1905 and the tapered shaft 1908 to rotate, and power transmission is realized through the transmission belt 1909. At this time, the other tapered shaft 1908 and the other connecting shaft 1905 and the third driving gear 1914 rotate, and the meshing action of the third driving gear 1914 and the tooth groove 1915 and the annular bevel gear 1911 and the bevel gear 1912 transmits power to the installation shaft 20, driving the installation shaft 20, the crushing shaft 15 and the crushing knife 16 to rotate synchronously, thereby crushing the debris entering the axial flow pump to prevent the debris from clogging the pump body and the blades. , and adopts the above-mentioned continuously variable speed change mechanism 19 and traction assembly, so that when the angle of the pump blade 2 changes, the traction rod 17 and the ball sleeve 18 in the traction assembly will move with the movement of the L-shaped rack 9, and at this time, the push-pull rod 25, the movable frame 1910 and the two rows of sliding rollers 1916 will be driven to move synchronously, driving the position of the transmission belt 1909 on the two tapered shafts 1908 to change. The change in the position of the transmission belt 1909 will cause the transmission ratio to change, realizing continuously variable speed change, thereby accelerating the rotation speed of the crushing shaft 15 and the crushing knife 16 when the angle of the pump blade 2 is large, and fully and quickly crushing hard objects such as branches entering the axial flow pump, thereby preventing some hard objects from flowing into the interior of the axial flow pump with the rapidly circulating water and affecting the safety performance of the pump body.

[0031] In the present invention, the two tapered shafts 1908 are centrally symmetrically distributed along the center of the gearbox 1907, and the outer walls of the two tapered shafts 1908 are fixed with anti-slip strips distributed at equal distances, such as Fig.10 As shown, the use of the above-mentioned anti-slip strip can ensure that the two tapered shafts 1908 can rotate simultaneously under the action of the same transmission belt 1909, thereby ensuring the transmission force.

[0032] In summary, 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, and drives the impeller hub 1 and the pump blades 2 to rotate together. When the pump blades 2 rotate, a lifting force is generated on the liquid entering the water inlet horn 1104, so that the liquid gains energy and flows axially. After passing through the pump blades 2, the liquid enters the guide vane body 1103, and the guide vanes 13 and the guide vane hub 12 in the guide vane body 1103 guide the water flow, making the water flow more stable, reducing vortices and turbulence, and finally the liquid is discharged from the pump body through the outlet elbow 1102; When the angle of the pump blade 2 needs to be adjusted, the hydraulic cylinder 7 installed at the bottom of the fixed frame 6 starts to work, and the piston end of the hydraulic cylinder 7 pushes the lifting plate 10 and the L-shaped rack 9 to move up and down, and the meshing L-shaped rack 9 and the steering gear 8 cause the steering gear 8 and the pump blade 2 to rotate, thereby realizing the adjustment of the angle of the pump blade 2, and by controlling the stroke of the piston of the hydraulic cylinder 7, the angle change of the pump blade 2 can be accurately controlled to meet the requirements of different working conditions; When the impeller hub 1 and the deflector 4 rotate, the rotating rod 1901 in the continuously variable transmission mechanism 19 rotates together, and 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, and 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 and the other connecting shaft 1905 and the third driving gear 1914 rotate, and the meshing action of the third driving gear 1914 and the tooth groove 1915 and the annular bevel gear 1911 and the bevel gear 1912 transmits power to the installation shaft 20, driving the installation shaft 20, the crushing shaft 15 and the crushing knife 16 to rotate synchronously, thereby crushing the debris entering the axial flow pump to prevent the debris from clogging the pump body and the blades; When the angle of the pump blade 2 changes, the traction rod 17 and the ball sleeve 18 in the traction assembly will move with the movement of the L-shaped rack 9, which will drive the push-pull rod 25 and the movable frame 1910 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 blade 2 is large, the liquid flow rate inside the axial flow pump will increase, and the flow rate 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, thereby preventing some hard objects from flowing into the axial flow pump with the rapidly circulating water and affecting the safety performance of the pump body.

[0033] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A blade angle adjustment device for an axial flow pump, comprising an impeller hub (1), characterized in that: A deflector (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 deflector (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 a steering shaft (3) via a sealed bearing. A pump blade (2) is 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). L-shaped racks (9) are fixedly mounted on the circumference of the lifting plate (10) and are arranged at equal distances and in an annular pattern, and one side of the L-shaped racks (9) is meshed with the outer wall of the steering gear (8).

2. A blade angle adjustment device for 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. A blade angle adjustment device for 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, characterized in that: The axial flow pump comprises the blade angle adjustment device for an axial flow pump as claimed in claim 3, and also comprises a pump body (11), wherein the pump body (11) is assembled from top to bottom by a driver (1101), a water outlet elbow (1102), a guide vane body (1103) and a water inlet horn (1104), and the driving end of the driver (1101) is installed with a pump shaft (1105) located at the center position 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 the bottom end of the pump shaft (1105) is fitted with a positioning plate (22) fitted to the inner wall of the top of the impeller hub (1), 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 inner wall of the water inlet horn (1104) is fixedly mounted with a first mounting plate distributed at equal distances, 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 distributed in an annular shape at equal distances, and the interior of the guide shell (14) is provided with a continuously variable transmission mechanism (19) for driving the anti-blocking mechanism to work, and the interior of the guide cover (4) and the interior of the guide shell (14) are provided with a traction component for driving the continuously variable transmission mechanism (19) to work.

7. An axial flow pump according to claim 6, 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.

8. An axial flow pump according to claim 7, characterized in that: The continuously variable transmission mechanism (19) comprises a second mounting plate fixed at equal distances to the inner wall of the guide housing (14), and a same gearbox (1907) is fixed to one end of the second mounting plate, the gearbox (1907) is rotatably connected to two connecting shafts (1905), 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 to the same transmission belt (1909), the outer wall of the transmission belt (1909) is sleeved with a movable frame (1910), and the movable frame (1910) is provided on the outer wall of the transmission belt (1909). The top ends of the frame (1910) are penetrated with round holes for the conical shaft (1908) to pass through, and the middle position of the inner wall of the movable frame (1910) is rotatably connected with two rows of equally spaced rollers (1916), and the two rows of rollers (1916) are respectively attached to the top surface and the bottom surface of the transmission belt (1909), and the surface of the roller (1916) does not contact the inner wall of the movable frame (1910), and the middle position of the top of the guide shell (14) is provided with a connecting hole (1904), and the middle position of the bottom of the guide cover (4) is fixed with a connecting hole (1904) passing through the connecting hole (190 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 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), and a second driving gear (1906) is meshed with the first driving gear (1902) An annular bevel gear (1911) is rotatably connected via a bearing, and tooth grooves (1915) are arranged at equal distances at the bottom of the circumferential inner wall of the annular bevel gear (1911). A third drive gear (1914) is fixedly mounted on the bottom of the outer wall of the other connecting shaft (1905), and the third drive gear (1914) is meshed with the tooth groove (1915). A bevel gear (1912) is fixedly mounted on one end of the mounting shaft (20) extending into the guide housing (14), and the outer wall of the bevel gear (1912) is meshed with the outer wall of the annular bevel gear (1911).

9. An axial flow pump according to claim 8, 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).

10. An axial flow pump according to claim 8, characterized in that: The traction assembly comprises a through hole (24) provided 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).

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