A high-flow, large-diameter inclined axial flow pump

Abstract

This invention discloses a high-flow-rate, large-diameter inclined axial flow pump, comprising a straight pipe, a bend, and a main shaft. One end of the main shaft is coaxially rotatably disposed within the straight pipe, while the other end rotatably penetrates the outer wall of the bend. The pump also includes: a sealing seat disposed on the bend and penetrated by the rotation of the main shaft; an isolation chamber disposed within the sealing seat, with a guide port near the bend end connecting to the interior of the bend and surrounding the main shaft; a circulation pipeline disposed outside the bend, with one end connecting to the isolation chamber and the other end connecting to the interior of the bend; and a flow guiding assembly disposed within the isolation chamber for guiding the liquid within the isolation chamber into the circulation pipeline. By incorporating the circulation pipeline and flow guiding assembly, this invention allows liquid impacting the connection between the bend and the main shaft to be actively guided from the guide port into the isolation chamber, then into the circulation pipeline, and finally back into the bend, thus forming a stable circulation path and isolating the sealing connection between the main shaft and the bend from the influence of the liquid.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, and specifically to a large-flow, large-diameter inclined axial flow pump. Background Technology

[0002] Axial flow pumps are pumps that use the force generated by the blades of a rotating impeller to transport liquid along the axial direction. There are several types, including vertical, horizontal, inclined, and through-flow pumps. Existing axial flow pumps can basically meet the needs of daily use, but there are still some shortcomings that need to be improved.

[0003] Patent document CN112112811A, published on December 22, 2020, discloses an axial flow pump, comprising: a main pump casing and a secondary pump casing coaxially connected at their upper ends; an inlet communicating with the lower end of the main pump casing; an outlet bend communicating with the main pump casing between the main and secondary pump casings; a first screw connecting the upper end of the secondary pump casing to a transition flange; a second screw connecting the upper end of the transition flange to an input flange; a drive input shaft rotatably mounted within the transition flange via a first upper bearing seat; the upper end of the drive input shaft passing through the input flange and connected to a tractor engine; and the lower end of the drive input shaft extending into the secondary pump casing and connected to a drive gear; a drive pump shaft located at the lower end of the drive gear. This prior art patent indicates that the bend portion of the axial flow pump is penetrated by the rotation of the main shaft. Patent document CN110043477A, ​​published on July 23, 2019, discloses a novel axial flow pump, including an axial flow pump body and a sealing assembly. The axial flow pump body includes a housing and a pump shaft. A guide tube communicating with the interior of the housing is located at the top of the housing. An annular support portion is provided on the inner wall of the guide tube's top end. A rubber bearing that mates with the pump shaft is arranged within the guide tube. The pump shaft includes a shoulder that abuts against the bottom end of the rubber bearing. The sealing assembly includes a first elastic adjusting member sleeved on the pump shaft and located between the support portion and the rubber bearing, and a second elastic adjusting member sleeved on the rubber bearing and located below the first elastic adjusting member. A buffer layer, which is sealed and sleeved on the rubber bearing, is provided between the first and second elastic adjusting members. The first elastic adjusting member, the buffer layer, the rubber bearing, and the pump shaft form a cavity for placing packing material. Wedge-shaped sealing rings are pressed between the first elastic adjusting member and the support portion, and between the second elastic adjusting member and the shoulder. This prior art improves the sealing performance at the penetration point of the bend in the pump shaft.

[0004] As can be seen from the existing technology, the bend of the axial flow pump is at least penetrated by the rotation of the main shaft, requiring a sealing structure. However, given that the liquid flow direction inside the axial flow pump is known to impact the penetration point of the main shaft, when the liquid is contaminated, particles mixed in the liquid can easily enter the gap between the bend and the rotating connection of the main shaft, causing wear, seal failure, and other problems. Therefore, there is an urgent need for a large-flow, large-diameter inclined axial flow pump to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-flow-rate, large-diameter inclined axial flow pump to overcome the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-flow, large-diameter inclined axial flow pump includes a straight pipe, a bend, and a main shaft. One end of the main shaft is coaxially rotatably disposed inside the straight pipe, while the other end rotatably penetrates the outer wall of the bend. The pump also includes: a sealing seat disposed on the bend and penetrated by the rotation of the main shaft; an isolation chamber disposed within the sealing seat, with a guide port near the bend end that connects to the interior of the bend and surrounds the main shaft; a circulation pipeline disposed outside the bend, with one end connecting to the isolation chamber and the other end connecting to the interior of the bend; and a flow guiding assembly disposed within the isolation chamber for guiding the liquid within the isolation chamber into the circulation pipeline.

[0008] Preferably, the circulation pipeline includes a first connector, a second connector, and a return element. One end of the first connector is connected to the isolation chamber, and the other end is connected to the second connector. The other end of the second connector is connected to the inside of the bend through the return element.

[0009] Preferably, the flow guiding assembly includes a turntable coaxially connected to the main shaft within an isolation chamber. The turntable, near the flow guiding port, separates a flow area within the isolation chamber. A first connecting pipe is configured to connect to the flow area. Multiple flow guiding plates are arranged circumferentially on the turntable near the flow guiding port.

[0010] Preferably, the first connector and the second connector are detachably connected. After the first connector and the second connector are disconnected, an external water supply pipe can be connected. The second connector controls the connection and disconnection between itself and the return component through a spring-loaded component.

[0011] Preferably, a connecting sleeve is movably sleeved at one end of the first connecting pipe, and an external thread is provided at the end of the second connecting pipe away from the return component, which can be screwed into the connecting sleeve.

[0012] Preferably, the rebound assembly includes a rebound seat fixedly disposed on the outer wall of the bent pipe, a pipe shaft elastically rotatably connected to the rebound seat via a torsion spring, one end of the pipe shaft being fixedly connected to the second pipe connector, the return component being sleeved on the second pipe connector and having a return hole inside, and the side wall of the second pipe connector having a mating hole matching the return hole.

[0013] Preferably, a filter tube is detachably provided at one end of the second connecting pipe and the return component, and the filter tube is provided to block the docking hole.

[0014] Preferably, the first connecting pipe is rotatably connected to the side wall of the sealing seat, and the guide vane is rotatably arranged relative to the turntable. The first connecting pipe is linked to the rotation of the guide vane through a linkage component. When the first connecting pipe is in the docking direction with the second connecting pipe, the guide vane is in the first position that guides the liquid to the inside of the guide port. When the first connecting pipe is in the direction away from the second connecting pipe, the guide vane is in the second position that guides the liquid to the outside of the guide port.

[0015] Preferably, the linkage assembly includes a control sleeve rotatably disposed inside the isolation chamber and a movable sleeve axially disposed. The control sleeve is rotatably linked with the first connecting pipe. The movable sleeve is threadedly connected to the inner side of the control sleeve. A linkage component is movably disposed on the turntable away from the flow area. The linkage component is provided with a sliding protrusion. The inner wall of the movable sleeve is provided with an annular groove that matches the sliding protrusion. The linkage component is provided with a linkage hole. The linkage hole is helically connected to the rotating shaft of the guide vane.

[0016] Preferably, the outer wall of the guide vane's rotating shaft is provided with a spiral wire, and the inner wall of the linkage hole is provided with a spiral groove that matches the spiral wire.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] This high-flow, large-diameter inclined axial flow pump, through the setting of a circulation pipeline and a flow guiding component, allows the liquid impacting the connection between the bend and the main shaft to be actively introduced from the flow guide port into the isolation chamber under the drive of the flow guiding component. Then, it enters the circulation pipeline and returns to the inside of the bend, thereby forming a stable circulation path near the connection between the bend and the sealing seat. This isolates the sealing connection between the main shaft and the bend from the influence of the liquid, ensuring stable sealing and greatly reducing the wear of the main shaft.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0020] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 This is a frontal cross-sectional view of the isolation cavity provided in an embodiment of the present invention;

[0024] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 This is a frontal cross-sectional view of the reflux hole provided in an embodiment of the present invention;

[0026] Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point B;

[0027] Figure 6 This is a side view cross-sectional structural schematic diagram provided in an embodiment of the present invention;

[0028] Figure 7 Provided for embodiments of the present invention Figure 6 Enlarged structural diagram at point C;

[0029] Figure 8 This is a schematic diagram of the flow guide structure provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Straight pipe; 2. Bend; 3. Main shaft; 4. Sealing seat; 5. Isolation chamber; 6. Flow guide port; 7. First connecting pipe; 8. Second connecting pipe; 9. Return component; 10. Turntable; 11. Flow guide plate; 12. Connecting sleeve; 13. Springback seat; 14. Torsion spring; 15. Pipe shaft; 16. Return hole; 17. Connecting hole; 18. Filter tube; 19. Control sleeve; 20. Movable sleeve; 21. Linkage component; 22. Sliding protrusion; 23. Annular groove; 24. Linkage hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0033] Please see Figure 1-8This invention provides a high-flow, large-diameter inclined axial flow pump, comprising a straight pipe 1, a bend 2, and a main shaft 3. One end of the main shaft 3 is coaxially rotatably disposed within the straight pipe 1, while the other end rotatably penetrates the outer wall of the bend 2. The pump also includes: a sealing seat 4 disposed on the bend 2 and rotatably penetrated by the main shaft 3; an isolation chamber 5 disposed within the sealing seat 4, with a guide port 6 near the bend 2 that connects to the interior of the bend 2 and surrounds the main shaft 3; a circulation pipeline disposed outside the bend 2, with one end connected to the isolation chamber 5 and the other end connected to the interior of the bend 2; and a flow guiding assembly disposed within the isolation chamber 5 for guiding the liquid within the isolation chamber 5 into the circulation pipeline.

[0034] Specifically, the straight pipe 1 includes, from bottom to top, a trumpet section, an impeller assembly section, and a guide vane section; the main shaft 3 is coaxial with the straight pipe 1, and one end of it extends into the straight pipe 1, passes through the guide vane section, and connects to the impeller assembly; the bent pipe 2 is sealed to the upper end of the guide vane section; the sealing seat 4 is coaxially and rotatably connected to the main shaft 3, and the two are sealed; the isolation chamber 5 is preferably a rotating cavity, coaxially arranged with the main shaft 3, and located near the lower end of the sealing seat 4; the guide port 6 is preferably coaxial with the main shaft 3 and is used to connect the inside of the bent pipe 2 with the inside of the isolation chamber 5; the circulation pipeline connects the isolation chamber 5 to the inside of the bent pipe 2 again from the side; the flow guiding assembly controls the liquid flow direction in the isolation chamber 5, and then guides the liquid to the circulation pipeline, which in turn guides the received liquid back into the bent pipe 2, thereby forming a circulation. In practical use, the fluid flows normally inside the bend 2, and the flow guiding component operates synchronously. Driven by the flow guiding component, the liquid impacting the connection between the bend 2 and the main shaft 3 can be actively introduced into the isolation chamber 5 from the flow guiding port 6, then enters the circulation pipeline, and then returns to the inside of the bend 2. This forms a stable circulation path near the connection between the bend 2 and the sealing seat 4, isolating the sealing connection between the main shaft 3 and the bend 2 from the influence of the liquid, ensuring stable sealing, and greatly reducing the wear of the main shaft 3.

[0035] Compared with the prior art, the large-flow, large-diameter inclined axial flow pump proposed in this embodiment of the invention, by setting up a circulation pipeline and a flow guiding component, allows the liquid impacting the connection between the bend 2 and the main shaft 3 to be actively introduced from the flow guiding port 6 into the isolation chamber 5 under the drive of the flow guiding component, and then enters the circulation pipeline, and then returns to the inside of the bend 2. This forms a stable circulation path near the connection between the bend 2 and the sealing seat 4, isolating the sealing connection between the main shaft 3 and the bend 2 from the influence of the liquid, ensuring stable sealing performance, and greatly reducing the wear of the main shaft 3.

[0036] As a preferred technical solution of this embodiment, the circulation pipeline includes a first connecting pipe 7, a second connecting pipe 8, and a return component 9. One end of the first connecting pipe 7 is connected to the isolation chamber 5, and the other end is connected to the second connecting pipe 8. The other end of the second connecting pipe 8 is connected to the inside of the bend 2 through the return component 9. Specifically, the first connecting pipe 7 is connected to the side wall of the sealing seat 4; the return component 9 is connected to the outer wall of the bend 2; the second connecting pipe 8 is connected between the first connecting pipe 7 and the return component 9. The liquid guided by the flow guiding component in the isolation chamber 5 is sequentially introduced into the first connecting pipe 7, the second connecting pipe 8, and the return component 9, and then returns to the inside of the bend 2.

[0037] As a preferred technical solution of this embodiment, the flow guiding assembly includes a turntable 10 coaxially connected to the main shaft 3 within the isolation cavity 5. The turntable 10, near the flow port 6, divides a flow area within the isolation cavity 5. A first connecting pipe 7 is configured to connect to the flow area. Multiple flow guiding plates 11 are arranged circumferentially on the side of the turntable 10 near the flow port 6. Specifically, the outer edge of the turntable 10 rotates against the inner wall of the isolation cavity 5. The flow area separated by the turntable 10 is used for liquid flow, while the blank area of ​​the isolation cavity 5 formed on the upper side of the turntable 10 does not allow liquid to enter, thereby ensuring that the rotating connection between the main shaft 3 and the sealing seat 4 is isolated from liquid. The flow guiding plates 11 are arc-shaped, with one end close to the main shaft 3 and the other end relatively far away from the main shaft 3. The flow guiding plates 11 have arc-shaped notches corresponding to the direction of the main shaft 3, and multiple flow guiding plates 11 are evenly arranged circumferentially. The turntable 10 rotates with the main shaft 3, causing each flow guiding plate 11 to rotate, so that liquid is introduced into the isolation cavity 5 from the flow port 6 and discharged to the first connecting pipe 7 connecting to the side of the isolation cavity 5.

[0038] In another embodiment of the present invention, the first connecting pipe 7 and the second connecting pipe 8 are detachably connected. After the first connecting pipe 7 and the second connecting pipe 8 are disconnected, a water supply pipe can be connected externally. The second connecting pipe 8 is controlled by a spring-loaded assembly to control the connection and disconnection between itself and the return member 9. Specifically, after the first connecting pipe 7 and the second connecting pipe 8 are disconnected, a water supply pipe is connected externally, and then clean water is supplied under external drive to flush the inside of the isolation chamber 5. When the first connecting pipe 7 and the second connecting pipe 8 are connected, the spring-loaded assembly controls the second connecting pipe 8 to remain connected to the return member 9. When the first connecting pipe 7 and the second connecting pipe 8 are disconnected, the spring-loaded assembly controls the second connecting pipe 8 to remain disconnected from the return member 9. In addition, the first connecting pipe 7 is connected to a water supply pipe externally, thereby preventing the liquid inside the bend 2 from leaking outward.

[0039] As a preferred technical solution in this embodiment, a connecting sleeve 12 is movably sleeved on one end of the first pipe 7, and an external thread is provided on the end of the second pipe 8 away from the return component 9, which can be screwed into the connecting sleeve 12. Specifically, when the first pipe 7 and the second pipe 8 correspond, the connecting sleeve 12 can be rotated to connect or disconnect on the second pipe 8, thereby completing the connection or disconnection of the first pipe 7, and the threaded connection ensures sealing.

[0040] As a preferred technical solution in this embodiment, the rebound assembly includes a rebound seat 13 fixedly disposed on the outer wall of the bent tube 2. A tube shaft 15 is elastically rotatably connected to the rebound seat 13 via a torsion spring 14. One end of the tube shaft 15 is fixedly connected to the second connecting tube 8. A return component 9 is sleeved on the second connecting tube 8 and has a return hole 16 inside. The side wall of the second connecting tube 8 has a mating hole 17 that matches the return hole 16. Specifically, both the first connecting tube 7 and the second connecting tube 8 are preferably L-shaped. One end of the first connecting tube 7 is arranged radially along the sealing seat 4, and the other end is bent towards... Below, one end of the second connector 8 is horizontally positioned, and the other end is bent upwards; the shaft 15 is coaxial with the horizontal end of the second connector 8; the torsion spring 14 is provided so that the second connector 8 automatically maintains the tendency to rotate away from the first connector 7; when the second connector 8 corresponds to the first connector 7, the return hole 16 and the docking hole 17 correspond and overlap, and are connected; after the second connector 8 rotates away from the first connector 7 due to the elastic force of the torsion spring 14, the return hole 16 and the docking hole 17 are completely misaligned and disconnected, and the second connector 8 will not leak.

[0041] As a further preferred technical solution in this embodiment, a filter tube 18 is detachably provided at one end of the second connecting pipe 8 connected to the return component 9. The filter tube 18 is configured to block the docking hole 17. Specifically, the filter tube 18 is used to filter particulate impurities in the liquid flowing from the second connecting pipe 8 to the return component 9. An internal threaded hole is provided at the end of the second connecting pipe 8 away from the pipe shaft 15, and a matching external thread is provided on the filter tube 18, thereby realizing the detachable function of the filter tube 18 for easy replacement or cleaning. With the filter tube 18, the liquid in the circulation pipeline is filtered and purified, and then re-enters the circulation path, so that the circulating liquid in the isolation chamber 5 is purer than the liquid inside the bend 2, which can protect the structure inside the isolation chamber 5. Furthermore, when the impurity content of the liquid pumped by the pump body is high, the filter tube 18 has a high blockage rate, so the filter tube 18 can be left unused, and the end of the second connecting pipe 8 connected to the filter tube 18 can be kept closed.

[0042] In another embodiment of the present invention, the first connecting pipe 7 is rotatably connected to the side wall of the sealing seat 4, and the guide vane 11 is rotatably disposed relative to the turntable 10. The first connecting pipe 7 is linked to the rotation of the guide vane 11 through a linkage component. When the first connecting pipe 7 is in the docking direction with the second connecting pipe 8, the guide vane 11 is in a first position that guides the liquid to the inside of the guide port 6. When the first connecting pipe 7 is in the direction away from the second connecting pipe 8, the guide vane 11 is in a second position that guides the liquid to the outside of the guide port 6. Specifically, the side wall of the sealing seat 4 is provided with a radially extending sleeve, and one end of the first connecting pipe 7 is rotatably connected inside the sleeve to communicate with the interior of the isolation cavity 5; the rotation of the first connecting pipe 7 The preferred range is 90°-180°; the rotation axis of the guide vane 11 rotates through the center of the radial direction of the turntable 10; the position where the end of the guide vane 11 rotates along the direction of the main shaft 3 is close to the main shaft 3 is the first position. At this time, the liquid enters the isolation chamber 5 through the guide port 6, and then, under the action of the turntable 10 driving the guide vanes 11 to rotate, the liquid in the isolation chamber 5 is guided to the first connector 7; the position where the end of the guide vane 11 rotates against the direction of the main shaft 3 is close to the main shaft 3 is the second position. At this time, the liquid is discharged from the isolation chamber 5 through the guide port 6, and the liquid inside the isolation chamber 5 is introduced into the isolation chamber 5 through the first connector 7 under the action of the turntable 10 driving the guide vanes 11 to rotate. In practical use, when the first connector 7 is connected to the second connector 8, the rotation of the main shaft 3 drives the turntable 10 to rotate, which in turn drives the guide vanes 11 at the first position to rotate. This allows liquid to be introduced into the isolation chamber 5 through the guide port 6, then guided to the first connector 7, and then back into the bend 2 through the second connector 8 and the return component 9, thus achieving a circulation flow path and isolating and protecting the connection between the main shaft 3 and the sealing seat 4. When the first connector 7 and the second connector 8 are disconnected, the second connector 8 automatically springs back and rotates away from the first connector 7, causing the return component 9 to automatically close. Then, the outer end of the first connector 7 rotates upward, and the first connector 7, through the linkage component, drives the guide vanes 11 to rotate and switch to the second position. The first connector 7 is then connected to an external water supply. At this time, the main shaft 3 drives the turntable 10 to rotate, and the turntable 10 drives the guide vanes 11 at the second position to rotate, thereby generating suction in the isolation chamber 5 to automatically introduce external water, which is then discharged through the guide port 6. This allows for flushing of the inside of the isolation chamber 5 without the need for external driving force.

[0043] As a preferred embodiment, the linkage assembly includes a control sleeve 19 rotatably disposed inside the isolation cavity 5 and a movable sleeve 20 axially movable. The control sleeve 19 is rotatably linked with the first connecting pipe 7. The movable sleeve 20 is threadedly connected to the inner side of the control sleeve 19. A linkage component 21 is movably disposed on the turntable 10 away from the flow area. The linkage component 21 is provided with a sliding protrusion 22. The inner wall of the movable sleeve 20 is provided with an annular groove 23 that matches the sliding protrusion 22. The linkage component 21 is provided with a linkage hole 24, which is helically connected to the rotating shaft of the guide vane 11. Specifically, the control sleeve 19 is embedded in the inner wall of the isolation cavity 5 and only rotates. A bevel gear ring is sleeved on the outer wall of the control sleeve 19. A bevel gear that meshes with the bevel gear ring is coaxially sleeved on the first connecting pipe 7, thereby realizing the linkage between the first connecting pipe 7 and the control sleeve 19. A key block is provided at the upper end of the outer wall of the movable sleeve 20, and a keyway is provided on the inner wall of the isolation cavity 5, thereby limiting the movable sleeve 20 to only be used in the isolation cavity 5. The inner axial movement allows for threaded feed with the rotating control sleeve 19. A guide post is axially positioned on the side of the turntable 10 away from the flow area, and the linkage 21 is sleeved on the guide post. A sliding protrusion 22 is embedded in the annular groove 23 to ensure that the movable sleeve 20 and the linkage 21 move synchronously axially or remain in the same position, without affecting the rotation of the turntable 10 and each guide vane 11. A spiral thread is provided on the outer wall of the guide vane 11's shaft, and a spiral groove matching the spiral thread is provided on the inner wall of the linkage hole 24. The pitch of the spiral thread and the spiral groove satisfies the requirement that the movement of the linkage 21 can actuate the rotation of the guide vane 11's shaft. In actual use, during the rotation of the first connecting pipe 7, the linkage control sleeve 19 rotates, and the control sleeve 19 and the movable sleeve 20 undergo threaded feed transmission. The movable sleeve 20 then drives the linkage 21 to move axially along the shaft of the guide vane 11 via the annular groove 23 and the sliding protrusion 22, thereby triggering the rotation of the guide vane 11 to switch positions via the spiral thread and the spiral groove.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A large-flow, large-diameter inclined axial flow pump, comprising a straight pipe (1), a bent pipe (2), and a main shaft (3), wherein one end of the main shaft (3) is coaxially rotatably disposed inside the straight pipe (1), and the other end rotatably penetrates the outer wall of the bent pipe (2), characterized in that, Also includes: The sealing seat (4) is set on the bend (2) and is penetrated by the rotation of the main shaft (3); The isolation chamber (5) is located inside the sealing seat (4), and a guide port (6) is provided at one end near the bend (2) to connect the inside of the bend (2) and surround the main shaft (3). The circulation pipeline is located outside the bend (2), with one end connected to the isolation chamber (5) and the other end connected to the inside of the bend (2); A flow guiding component is disposed in the isolation chamber (5) for guiding the liquid in the isolation chamber (5) into the circulation pipeline; The circulation pipeline includes a first connector (7), a second connector (8) and a return component (9). One end of the first connector (7) is connected to the isolation chamber (5), and the other end is connected to the second connector (8). The other end of the second connector (8) is connected to the inside of the bend (2) through the return component (9). The first pipe (7) and the second pipe (8) are detachably connected. After the first pipe (7) and the second pipe (8) are disconnected, an external water supply pipe can be connected. The second pipe (8) controls the connection and disconnection between itself and the return component (9) through the spring-loaded component. The rebound assembly includes a rebound seat (13) fixedly installed on the outer wall of the bent tube (2). A tube shaft (15) is elastically rotatably connected to the rebound seat (13) via a torsion spring (14). One end of the tube shaft (15) is fixedly connected to the second tube (8). The return component (9) is sleeved on the second tube (8) and has a return hole (16) inside. The side wall of the second tube (8) has a mating hole (17) that matches the return hole (16).

2. The large-flow, large-diameter inclined axial flow pump according to claim 1, characterized in that, The flow guiding assembly includes a turntable (10) coaxially connected to the main shaft (3) inside the isolation chamber (5). The turntable (10) near the flow guide port (6) separates a flow area in the isolation chamber (5). The first pipe (7) is connected to the flow area. Multiple flow guide plates (11) are arranged around the turntable (10) near the flow guide port (6).

3. The large-flow, large-diameter inclined axial flow pump according to claim 1, characterized in that, The first connector (7) is movably fitted with a connecting sleeve (12) at one end, and the second connector (8) is provided with an external thread at the end away from the return component (9) that can be screwed into the connecting sleeve (12).

4. The large-flow, large-diameter inclined axial flow pump according to claim 1, characterized in that, The second connector (8) is connected to the return component (9) and a filter tube (18) is detachably provided at one end. The filter tube (18) blocks the docking hole (17).

5. The large-flow, large-diameter inclined axial flow pump according to claim 2, characterized in that, The first connecting pipe (7) is rotatably connected to the side wall of the sealing seat (4). The guide plate (11) is rotatably set relative to the turntable (10). The first connecting pipe (7) is linked to the rotation of the guide plate (11) through the linkage component. When the first connecting pipe (7) is in the docking direction with the second connecting pipe (8), the guide plate (11) is in the first position that guides the liquid to the inside of the guide port (6). When the first connecting pipe (7) is in the direction away from the second connecting pipe (8), the guide plate (11) is in the second position that guides the liquid to the outside of the guide port (6).

6. The large-flow, large-diameter inclined axial flow pump according to claim 5, characterized in that, The linkage assembly includes a control sleeve (19) rotatably disposed inside the isolation chamber (5) and a movable sleeve (20) axially movable. The control sleeve (19) is rotatably linked with the first connecting pipe (7). The movable sleeve (20) is threadedly connected to the inside of the control sleeve (19). A linkage component (21) is movably disposed on the turntable (10) away from the flow area. A sliding protrusion (22) is disposed on the linkage component (21). An annular groove (23) matching the sliding protrusion (22) is disposed on the inner wall of the movable sleeve (20). A linkage hole (24) is disposed on the linkage component (21). The linkage hole (24) is helically connected to the rotating shaft of the guide vane (11).

7. The large-flow, large-diameter inclined axial flow pump according to claim 6, characterized in that, The outer wall of the guide plate (11) is provided with a spiral wire, and the inner wall of the linkage hole (24) is provided with a spiral groove that matches the spiral wire.

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