A pump pipe structure and multi-stage mixed pump

Abstract

The invention discloses a pump pipe structure and a multi-stage mixed flow pump. The pump pipe structure comprises a pipe body and matching piers installed at both ends of the pipe body. The matching piers can match with flange piers arranged on the multi-stage mixed flow pump. A plurality of self-locking heads are arranged and installed on the inner circumference of the matching piers. The self-locking heads comprise a connecting base buried and fixed in the matching pier and a plug connected to the connecting base and capable of being inserted into a locking hole. The connecting base and the plug are connected by a connecting rod. The inner wall of the pipe body is provided with a plurality of water inlets corresponding to the self-locking heads. The water inlets are connected to a buoyancy cavity in the connecting base. The buoyancy cavity is also surrounded by setting cavities arranged corresponding to the connecting rod. The setting cavities are interconnected by serial channels arranged at the upper and lower ends of a floating ball, and magnetic block cylinder cavities located above and below the floating ball are formed at the gathering point. A movable magnetic block is arranged in each magnetic block cylinder cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to a pump tube structure and a multi-stage mixed flow pump. Background Art

[0002] Deep-sea mineral resources are an important resource. In view of the technical characteristics of deep-sea mineral resource development, the deep-sea mineral resource development system currently recognized as the most promising for industrial mining is the hydraulic lifting mining system, which uses seabed ore collection vehicles to collect ore, and then uses mixed-transfer pumps (or ore-lifting pumps) to lift the ore to the surface mining ship through pipelines. The mixed-transfer pump provides power for the entire conveying system and is one of the key equipment of the hydraulic lifting mining system.

[0003] The mixed flow pump for deep-sea mining is a typical solid-liquid two-phase flow pump. The patent with publication number CN112524042B discloses a multi-stage mixed flow pump for deep-sea mining, which includes a motor connecting frame, a connecting pipe, a submersible motor, a motor-pump connecting frame, an inlet pump cover, a coupling, a rotor component, a first-stage guide body, an intermediate pump cover 1, a secondary guide body, an intermediate pump cover 2, a final guide body, a guide bearing, an outlet pump cover, a cylinder and a pump stop protection device; the guide bearing includes a guide bearing moving ring and a guide bearing static ring, both of which use duplex stainless steel as the matrix, and a cobalt alloy wear-resistant layer with a thickness of 0.25 to 0.5 mm is laser-clad on the outer surface of the moving ring and the inner surface of the static ring; the front cover plate and the rear cover plate of the impeller are both provided with back blades, and the number of blades of the front cover plate back blades is 2 to 3 of the number of impeller blades. times, the outer diameter of the back blade of the rear cover plate is 0.4 to 0.6 times the outer diameter of the impeller, and the number of the back blade of the rear cover plate is 1.5 to 2 times the number of the impeller blades. The device provides a multi-stage mixed pump for deep-sea mining that not only solves the wear problem of the submersible motor housing, but also improves the service life of the rotor components of the mixed pump. However, the pump pipe of the device is connected to the motor connecting frame and the machine pump connecting frame by bolts. Not only is the installation step cumbersome, but after the installation is completed, the bolts are put into the sea with the pump machine. They are easily corroded and their strength decreases under long-term immersion in seawater, which affects the stability of the device. At the same time, after the bolts are corroded, they will also rust together with the motor connecting frame and the machine pump connecting frame, which makes subsequent disassembly and maintenance difficult. For this reason, we propose a pump pipe structure and a multi-stage mixed pump. Summary of the invention

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a pump pipe structure and a multi-stage mixed flow pump.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pump pipe structure, suitable for a multi-stage mixed flow pump, comprises a pipe body and matching piers installed at both ends of the pipe body, the matching piers can match with flange piers provided in the multi-stage mixed flow pump, a plurality of self-locking heads are arranged and installed on the inner circumference of the matching piers, the self-locking heads comprise a connecting base embedded and fixed in the matching piers and a butt plug connected to the connecting base and capable of being inserted into a locking hole, the connecting base and the butt plug being connected by a connecting rod;

[0007] The inner wall of the tube body is provided with a plurality of water inlets corresponding to the self-locking heads, the water inlets are connected to the buoyancy chamber in the base, and the buoyancy chamber is surrounded by setting chambers corresponding to the connecting rods. The setting chambers are interconnected through series channels provided at the upper and lower ends of the floating ball, and a magnetic block cylinder chamber located above and below the floating ball is formed at the gathering place, and a movable magnetic block is provided in each magnetic block cylinder chamber;

[0008] A through outlet is opened on the top plate of the setting cavity toward the plug to allow the lower end of the connecting rod to be inserted, and a swing lever is arranged in the setting cavity. The upper end of the swing lever is connected to the lower end of the connecting rod through a double-end rotating shaft, and the lower end is connected to a pair of bent transmission rods, and the movable magnetic block is detachably connected to the bent transmission rod.

[0009] Preferably, the plug has an adjustment cavity inside, the upper end of the adjustment cavity vertically passes to the outside, an extension frame is arranged in the adjustment cavity, wedge blocks at both ends of the extension frame protrude from the adjustment cavity, wherein the slope surface of the wedge block is away from the connecting base.

[0010] Preferably, the wedge block is connected to a vertical moving piece arranged at the central axis of the adjustment cavity through a bending arm, the bottom end of the vertical moving piece is connected to a spring of the bottom surface of the adjustment cavity, the vertical moving piece is maintained by the spring at the same horizontal plane as the wedge block so that the bending arm is straight, and the end of the vertical moving piece away from the connecting base is connected to an unlocking rod extending to the outside of the adjustment cavity.

[0011] Preferably, the movable magnetic block can move toward or away from the float in the magnetic block cylinder cavity, and there is a channel between the series channels away from the plug to allow seawater to flow into the buoyancy chamber. Magnetic repulsion blocks are provided at the upper and lower ends of the float, and the float provided with magnetic repulsion blocks is maintained at a designated initial position in the buoyancy chamber by two upper and lower reset springs.

[0012] Preferably, a telescopic wedge is provided at one end of the bending transmission rod close to the moving magnet, and the telescopic wedge spring is installed in the recovery groove of the end of the bending transmission rod. The moving magnet has a limiting groove allowing the telescopic wedge to be inserted, and the limiting groove has a gravity slide groove arranged orthogonally thereto, and the gravity slide groove is provided with a locking column that can slide toward or away from the limiting groove under the influence of gravity.

[0013] Preferably, a large friction force will be generated between the side wall of the locking column and the inner wall of the gravity slide groove, but it will not prevent the vertical movement of the locking column, so that the movable magnetic block can fall before the locking column and allow the telescopic wedge block to extend into the limit groove, and the telescopic wedge block is provided with a lock hole that allows the locking column to be inserted.

[0014] Preferably, the length of the connection between the bent transmission rod and the swing lever can be changed, and the lever shaft of the swing lever is mounted on the inner wall of the setting cavity and can move toward or away from the plug within a certain limit.

[0015] A multi-stage mixed flow pump is also provided, comprising a pump head, a pump-machine connecting frame, a motor, and a machine-pump connecting frame. A pump pipe is installed between the pump-machine connecting frame and the machine-pump connecting frame. The pump-machine connecting frame and the machine-pump connecting frame are provided with flange piers at the connection with the pump pipe. The flange piers have a plurality of locking holes matching the self-locking heads.

[0016] Preferably, a waterproof gasket is arranged between the flange pier and the mating pier, a limiting ring groove allowing the wedge block to be inserted is arranged on the inner wall of the locking hole, a waterproof socket is arranged on the side of the flange pier away from the connecting base, and the end of the unlocking rod protruding from the plug is provided with a waterproof plug for blocking the waterproof socket.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses a self-locking head to automatically lock and install the pump pipe with the pump-machine connecting frame and the machine-pump connecting frame. During installation, the user does not need to use laborious installation bolts to install the pump pipe, thus saving time and effort. The installed self-locking head is wrapped by the matching pier, the flange pier, and the waterproof gasket between the matching pier and the flange pier and will not contact seawater after going into the sea, thereby greatly reducing the possibility of rusting of the locking structure and ensuring the reliability and stability of the pump pipe after installation.

[0019] The self-locking head of the present invention can further lock the pump pipe, the pump connecting frame and the machine-pump connecting frame with the help of the buoyancy of seawater when the pump is put into use in the sea. When the pump is out of water for maintenance, the locking relationship can be automatically released due to separation from seawater without affecting the disassembly of the pump pipe, making the disassembly and maintenance of the pump pipe more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the structure of a multi-stage mixed flow pump according to the present invention;

[0022] Figure 2 This is a schematic diagram of a vertical cross-sectional structure of a multi-stage mixed flow pump pipe according to the present invention;

[0023] Figure 3This is a schematic diagram of the self-locking head structure of the present invention;

[0024] Figure 4 for Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 5 for Figure 3 The enlarged structural diagram at B in the middle;

[0026] Figure 6 It is a schematic diagram of the structure of the connection between the bent transmission rod and the moving magnetic block.

[0027] In the figure: 1, pump head; 2, pump connecting frame; 3, motor; 4, pump connecting frame; 5, pump pipe; 501, adjustment chamber; 502, water inlet; 503, buoyancy chamber; 504, setting chamber; 505, series passage; 506, magnetic block cylinder chamber; 507, through outlet; 508, recovery slot; 509, limit slot; 5010, gravity slide; 5011, lock; 51, pipe body; 52, matching pier; 53, self-locking head; 531, through base; 5311, floating ball; 5312, Magnetic repulsion block; 5313, return spring; 532, plug; 533, connecting rod; 534, extension frame; 5341, wedge block; 5342, bending arm; 5343, vertical moving piece; 5344, unlocking rod; 535, moving magnetic block; 536, swing lever; 537, double-ended rotating shaft; 538, bending transmission rod; 5381, telescopic wedge block; 5382, locking column; 6, flange pier; 601, locking hole; 602, limiting ring groove; 603, waterproof socket; 7, waterproof gasket. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0029] Reference Figure 1-6 A multi-stage mixed flow pump comprises a pump head 1, a pump connecting frame 2, a motor 3, and a pump connecting frame 4. A pump pipe 5 is installed between the pump connecting frame 2 and the pump connecting frame 4. After the solid-liquid two-phase flow medium flows into the pump pipe 5 from the pump connecting frame 2, it flows into the pump connecting frame 4. The upper end of the motor 3 is fixed to the pump connecting frame 2, and the stop transition of the lower end of the motor 3 is fitted in the pump connecting frame 2. The motor shaft of the motor 3 is fixed to the pump shaft of the multi-stage mixed flow pump installed on the pump head 1 through a coupling.

[0030] The pump-machine connecting frame 2 and the machine-pump connecting frame 4 are provided with flange piers 6 at the connection with the pump pipe 5. The pump pipe 5 includes a pipe body 51 and matching piers 52 installed at both ends of the pipe body 51. A plurality of self-locking heads 53 are arranged and installed on the inner circumference of the matching piers 52. The flange piers 6 have a plurality of locking holes 601 matching the self-locking heads 53. After the pump pipe 5 is inserted between the pump-machine connecting frame 2 and the machine-pump connecting frame 4, the flange piers 6 provided on the pump-machine connecting frame 2 and the machine-pump connecting frame 4 can be automatically locked by docking with the matching piers 52.

[0031] The self-locking head 53 includes a connecting base 531 embedded and fixed in the matching pier 52 and a plug 532 connected to the connecting base 531 and capable of being inserted into the locking hole 601. The connecting base 531 and the plug 532 are connected by a connecting rod 533, so that there is a gap between the connecting base 531 and the plug 532 to allow the waterproof gasket 7 to be inserted. Before assembling the self-locking head 53 and the flange pier 6, the user can first cover the surface of the matching pier 52 with the waterproof gasket 7. After the docking assembly, the waterproof gasket 7 can play a role of buffering and further sealing between the matching pier 52 and the flange pier 6.

[0032] The plug 532 has an adjustment cavity 501 inside, the upper end of the adjustment cavity 501 is vertically connected to the outside, and an extension frame 534 is arranged in the adjustment cavity 501. Wedge blocks 5341 at both ends of the extension frame 534 protrude from the adjustment cavity 501, wherein the slope surface of the wedge block 5341 is away from the connecting base 531, so that when the plug 532 is inserted into the locking hole 601, the inner side wall of the locking hole 601 can temporarily squeeze the wedge block 5341 into the adjustment cavity 501, and the inner periphery of the locking hole 601 The wall is provided with a limiting ring groove 602 allowing the wedge block 5341 to be inserted. When the plug 532 is inserted into the locking hole 601 to a certain depth, the wedge block 5341 can re-protrude from the adjustment cavity 501 and be inserted into the limiting ring groove 602. The flat surface of the wedge block 5341 inserted into the limiting ring groove 602 abuts against the bottom surface of the limiting ring groove 602, so that the wedge block 5341 is prohibited from separating from the plug 532 after being inserted into the limiting ring groove 602, thereby completing the automatic docking and locking of the pump pipe 5 and the flange pier 6.

[0033] The wedge block 5341 is connected to the vertical moving member 5343 arranged at the central axis of the adjustment cavity 501 through the bending arm 5342. The bottom end of the vertical moving member 5343 is connected to the spring of the bottom surface of the adjustment cavity 501. The vertical moving member 5343 is kept at the same horizontal plane as the wedge block 5341 by the spring to make the bending arm 5342 straight. When the wedge block 5341 is squeezed into the adjustment cavity 501 by the locking hole 601, the wedge block 5341 will push the bending arm 5342 to move. The arm 5342 is bent, and the spatial layout in the adjustment cavity 501 only allows the bent arm 5342 to bend toward the connecting base 531. The bent arm 5342 can push the vertical moving piece 5343 toward the connecting base 531 to compress the spring. The elastic force of the spring can push the vertical moving piece 5343 back to its original position when the wedge block 5341 moves to the same horizontal position as the limiting ring groove 602, thereby pushing the wedge block 5341 into the limiting ring groove 602.

[0034] The end of the vertical moving member 5343 away from the connecting base 531 is connected to an unlocking rod 5344 extending to the outside of the adjustment chamber 501. The side of the flange pier 6 away from the connecting base 531 has a waterproof socket 603. The end of the unlocking rod 5344 protruding from the plug 532 has a waterproof plug for blocking the waterproof socket 603. When it is necessary to separate the flange pier 6 from the matching pier 52, the user can use a long rod to insert the waterproof socket 603 to unlock the unlocking rod 5344 together with the vertical moving member 5343. The part 5343 is pushed back to the locking hole 601, so that the vertical moving part 5343 is linked with the bending arm 5342 to bend and pull the wedge block 5341 into the adjustment cavity 501 to release the lock of the flange pier 6 and the matching pier 52. It can be understood that when the spring at the bottom of the vertical moving part 5343 is not pressed down, the waterproof plug at the end of the unlocking rod 5344 can be tightly sealed to block the waterproof socket 603, thereby effectively preventing seawater from flowing into the locking hole 601 and corroding the self-locking head 53 after the pump is put into water. Embodiment 2

[0035] Reference Figure 1-6 The difference between this embodiment and embodiment 1 is that the inner wall of the tube body 51 has a plurality of water inlets 502 corresponding to the self-locking heads 53, and the water inlets 502 are connected to the buoyancy chamber 503 in the base 531. After the mixed pump is put into seawater, the seawater can flow into the buoyancy chamber 503 through the water inlet 502 to generate buoyancy for the float 5311 in the buoyancy chamber 503.

[0036] The buoyancy chamber 503 is also surrounded by setting chambers 504 corresponding to the connecting rods 533. The setting chambers 504 are interconnected through series channels 505 provided at the upper and lower ends of the float 5311, and form magnetic block tube chambers 506 located above and below the float 5311 at the gathering point. A movable magnet 535 is provided in each magnetic block tube chamber 506. The movable magnet 535 can move toward or away from the float 5311 in the magnetic block tube chamber 506. A channel allowing seawater to flow into the buoyancy chamber 503 is provided between the series channels 505 away from the docking plug 532, and the top of the buoyancy chamber 503 is sealed to prevent seawater from entering the gap between the connecting base 531 and the docking plug 532.

[0037] The setting cavity 504 is provided with an outlet 507 on the top plate facing the plug 532 to allow the lower end of the connecting rod 533 to be inserted, and a swing lever 536 is provided in the setting cavity 504. The upper end of the swing lever 536 is connected to the lower end of the connecting rod 533 through a double-ended rotating shaft 537, and the two ends of the double-ended rotating shaft 537 are respectively connected to the upper end of the swing lever 536 and the lower end rotating shaft of the connecting rod 533. The end of the swing lever 536 away from the plug 532 is connected to a bent transmission rod 538, and the lever rotating shaft of the swing lever 536 is mounted on the inner wall of the setting cavity 504, and can move toward or away from the plug 532 within a certain limit.

[0038] When the bent transmission rod 538 pushes the force arm of the swing lever 536 to swing, it can pull the force arm connected to the other side of the connecting rod 533 to rotate so that the end is away from the plug 532, and then pull the connecting rod 533 to move toward the connecting base 531. The connecting rod 533 moving toward the connecting base 531 can pull the plug 532 and the locked flange pier 6 toward the matching pier 52 provided on the connecting base 531, so that the two ends of the pump pipe 5 are further tightly installed and connected with the pump-machine connecting frame 2 and the machine-pump connecting frame 4 provided with the flange pier 6.

[0039] Preferably, the force arm of the swing lever 536 at one end away from the plug 532 is longer than the force arm at the end close to the plug 532, so that the smaller force driving the swing lever 536 to deflect can be transmitted to the other end of the swing lever 536 to form a larger force to pull the connecting rod 533 to move, thereby more effectively pulling the flange pier 6.

[0040] After the mixed-flow pump is thrown into the sea with the pump connecting frame 2 facing downward, the plug 532 of the self-locking head 53 installed on the top of the pump pipe 5 is set upward, and the movable magnet 535 above the float 5311 settles at the bottom of the magnet cylinder cavity 506 and is docked with the bent transmission rod 538, so that the bent transmission rod 538 can move vertically with the movable magnet 535. After the bent transmission rod 538 extends into the setting cavity 504 through the series channel 505, it extends to the end of the swing lever 536 away from the plug 532 and is connected to it. The length of the connection between the bent transmission rod 538 and the swing lever 536 can be changed, so that when the bent transmission rod 538 moves vertically as a whole, it can drive the lower end of the swing lever 536 to swing, thereby tightening the pump connecting frame 2 and the pump pipe 5.

[0041] The upper and lower ends of the float 5311 are provided with magnetic repulsion blocks 5312. The float 5311 provided with the magnetic repulsion blocks 5312 is maintained at a specified initial position in the buoyancy chamber 503 by two upper and lower return springs 5313. When the float 5311 floats up under the immersion of seawater, the magnetic repulsion block 5312 will be pushed toward the movable magnetic block 535 originally stably placed at the bottom of the magnetic block cylinder cavity 506. After the magnetic repulsion block 5312 moves up, the movable magnetic block 535 will be pushed up by the gradually powerful magnetic repulsion thrust between the two due to their approach to each other, thereby driving the bent transmission rod 538 connected to the movable magnetic block 535 to move up.

[0042] A telescopic wedge 5381 is provided at one end of the bending transmission rod 538 close to the movable magnet 535. The telescopic wedge 5381 is spring-mounted in the recovery groove 508 at the end of the bending transmission rod 538. The movable magnet 535 has a limiting groove 509 allowing the telescopic wedge 5381 to be inserted. The limiting groove 509 has a gravity slide 5010 arranged orthogonally thereto. The gravity slide 5010 is provided with a locking column 5382 that can slide toward or away from the limiting groove 509 under the influence of gravity. The telescopic wedge 5381 is provided with a locking port 5011 that allows the locking column 5382 to be inserted. After the locking column 5382 falls and is inserted into the locking port 5011, it can prevent the telescopic wedge 5381 from moving away from the limiting groove 509, thereby allowing the end of the bending transmission rod 538 to remain connected to the movable magnet 535.

[0043] The upper and lower surfaces of the telescopic wedge block 5381 are inclined to form a tip facing the movable magnet 535. When the plug 532 of the self-locking head 53 is turned upside down, the locking column 5382 in the movable magnet 535 facing the side of the plug 532 will move back to the gravity slide groove 5010 and disengage from the lock mouth 5011. The movable magnet 535 tends to fall in the direction of the plug 532. Under the action of gravity, the telescopic wedge block 5381 will be squeezed back into the limiting groove 509, thereby disengaging the movable magnet 535 from the bent transmission rod 538. Embodiment 3

[0044] Reference Figure 1-6 The difference between this embodiment and embodiment 2 is that two bending transmission rods 538 are provided in each setting cavity 504, one of which can be connected to the moving magnet 535 close to the side of the plug 532, and the other can be connected to the moving magnet 535 away from the side of the plug 532. The moving magnet 535 away from the side of the plug 532 falls down and separates from the bending transmission rod 538 when the plug 532 is upward, thereby not affecting the linkage action between the swing lever 536 and the moving magnet 535 close to the side of the plug 532.

[0045] The plug 532 of the self-locking head 53 at the lower end of the pump tube 5 is inserted downward into the locking hole 601, and the movable magnetic block 535 of the self-locking head 53 here, which is close to the plug 532, is separated from the bent transmission rod 538, while the movable magnetic block 535 on the side away from the plug 532 falls toward the float 5311 and is connected to the bent transmission rod 538. It is worth mentioning that a large friction force will be generated between the side wall of the locking column 5382 and the inner wall of the gravity slide 5010, but it will not prevent the locking column 5382 from moving vertically, so that the movable magnetic block 535 can fall before the locking column 5382 and make the telescopic wedge block 5381 extend into the limiting groove 509. After the telescopic wedge block 5381 extends into the limiting groove 509, the locking column 5382 will slowly fall and insert into the lock port 5011, thereby locking the movable magnetic block 535 and the bent transmission rod 538.

[0046] After the lower end of the pump tube 5 moves away from the plug 532 and the movable magnet 535 on one side is locked with the bent transmission rod 538, the float 5311 floats upward and pushes the movable magnet 535 to move away from the plug 532, thereby pulling the swing lever 536 and the connecting rod 533 together to move toward the connecting base 531.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pump pipe structure, suitable for a multi-stage mixed flow pump, comprising a pipe body (51) and matching piers (52) installed at both ends of the pipe body (51), wherein the matching piers (52) can match with flange piers (6) provided in the multi-stage mixed flow pump, characterized in that: A plurality of self-locking heads (53) are arranged and installed on the inner circumference of the mating pier (52), the self-locking heads (53) comprising a connecting base (531) embedded and fixed in the mating pier (52) and a mating plug (532) connected to the connecting base (531) and capable of being inserted into the locking hole (601), the connecting base (531) and the mating plug (532) being connected via a connecting rod (533); The inner wall of the tube body (51) has a plurality of water inlets (502) corresponding to the self-locking heads (53), the water inlets (502) are connected to the buoyancy chamber (503) in the base (531), the buoyancy chamber (503) is surrounded by setting chambers (504) corresponding to the connecting rods (533), the setting chambers (504) are connected to each other through serial channels (505) arranged at the upper and lower ends of the floating ball (5311), and a magnetic block cylinder chamber (506) located above and below the floating ball (5311) is formed at the gathering point, and a movable magnetic block (535) is arranged in each magnetic block cylinder chamber (506); The setting cavity (504) is provided with an outlet (507) toward the top plate of the plug (532) for allowing the lower end of the connecting rod (533) to be inserted. A swing lever (536) is provided in the setting cavity (504). The upper end of the swing lever (536) is connected to the lower end of the connecting rod (533) via a double-end rotating shaft (537). The lower end is connected to a pair of bent transmission rods (538). The movable magnetic block (535) is detachably connected to the bent transmission rod (538).

2. A pump tube structure according to claim 1, characterized in that: The plug (532) has an adjustment cavity (501) inside, the upper end of the adjustment cavity (501) vertically extends to the outside, an extension frame (534) is arranged in the adjustment cavity (501), wedge blocks (5341) at both ends of the extension frame (534) protrude from the adjustment cavity (501), wherein the slope surface of the wedge block (5341) is away from the connecting base (531).

3. A pump tube structure according to claim 2, characterized in that: The wedge block (5341) is connected to a vertical moving member (5343) arranged at the central axis of the adjustment chamber (501) through a bending arm (5342); the bottom end of the vertical moving member (5343) is connected to a spring at the bottom surface of the adjustment chamber (501); the vertical moving member (5343) is held by the spring at the same horizontal plane as the wedge block (5341) so that the bending arm (5342) is straight; and an end of the vertical moving member (5343) away from the connecting base (531) is connected to an unlocking rod (5344) extending to the outside of the adjustment chamber (501).

4. A pump tube structure according to claim 3, characterized in that: The movable magnetic block (535) can move toward or away from the floating ball (5311) in the magnetic block cylinder cavity (506), and a channel for allowing seawater to flow into the buoyancy chamber (503) is provided between the series channel (505) away from the plug (532). The floating ball (5311) is provided with magnetic repulsion blocks (5312) at both upper and lower ends. The floating ball (5311) provided with the magnetic repulsion blocks (5312) is maintained at a specified initial position in the buoyancy chamber (503) by two upper and lower return springs (5313).

5. A pump tube structure according to claim 1, characterized in that: A telescopic wedge (5381) is provided at one end of the bending transmission rod (538) close to the movable magnet (535); a spring on the telescopic wedge (5381) is installed in a recovery groove (508) at the end of the bending transmission rod (538); a limiting groove (509) is provided in the movable magnet (535) for allowing the telescopic wedge (5381) to be inserted; a gravity slide groove (5010) is provided in the limiting groove (509) and is arranged orthogonally thereto; a locking column (5382) is provided in the gravity slide groove (5010) and is capable of sliding toward or away from the limiting groove (509) under the influence of gravity.

6. A pump tube structure according to claim 5, characterized in that: A relatively large friction force is generated between the side wall of the locking column (5382) and the inner wall of the gravity slide groove (5010), but the friction force does not prevent the vertical movement of the locking column (5382), so that the movable magnetic block (535) can fall before the locking column (5382) and allow the telescopic wedge block (5381) to extend into the limiting groove (509). The telescopic wedge block (5381) is provided with a locking port (5011) that allows the locking column (5382) to be inserted.

7. A pump tube structure according to claim 1, characterized in that: The length of the connection between the bent transmission rod (538) and the swing lever (536) can be changed. The lever shaft of the swing lever (536) is mounted on the inner wall of the setting cavity (504) and can move toward or away from the plug (532) within a certain limit.

8. A multi-stage mixed flow pump, using the pump tube structure as described in any one of claims 1 to 7, characterized in that: The mixed flow pump comprises a pump head (1), a pump connecting frame (2), a motor (3) and a pump connecting frame (4); a pump pipe (5) is installed between the pump connecting frame (2) and the pump connecting frame (4); a flange pier (6) is provided at the connection between the pump connecting frame (2) and the pump connecting frame (4) and the pump pipe (5); the flange pier (6) has a plurality of locking holes (601) matching the self-locking head (53).

9. A multi-stage mixed flow pump according to claim 8, characterized in that: A waterproof gasket (7) is arranged between the flange pier (6) and the matching pier (52); the inner wall of the locking hole (601) is provided with a limiting ring groove (602) allowing the wedge block (5341) to be inserted; the flange pier (6) has a waterproof socket (603) on the side away from the connecting base (531); and the end of the unlocking rod (5344) protruding from the plug (532) has a waterproof plug for blocking the waterproof socket (603).

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