An anti-shock structure for the liquid inlet of a pump tower

Abstract

The present application relates to the technical field of cryogenic storage devices, and particularly to an anti-impact structure for liquid inlet of a pump tower, which includes a liquid inlet pipe and a flow guide cylinder coaxially and rotatably sleeved on the lower part of the liquid inlet pipe. The upper part of the flow guide cylinder is open for the lower part of the liquid inlet pipe to be inserted, so that the inner cavities of the liquid inlet pipe and the flow guide cylinder are communicated. The outer peripheral wall of the lower part of the flow guide cylinder is radially provided with flow guide ports communicated with the inner cavity. There are multiple flow guide ports and they are distributed around the axis of the flow guide cylinder. The bottom wall of the flow guide cylinder is coaxially and fixedly connected with a central shaft, and an impeller built in the liquid inlet pipe is coaxially and fixedly sleeved on the upper part of the central shaft. The present application has the effect of preventing the fluid from directly impacting the bottom wall of the storage tank and improving the service life of the storage tank.

Description

Technical Field

[0001] The present application relates to the technical field of cryogenic storage devices, and in particular to an anti-impact structure for liquid inlet of a pump tower. Background Art

[0002] Liquefied Natural Gas (LNG), mainly composed of methane, is recognized as the cleanest fossil energy on earth. When transporting natural gas, for more economical long-distance transportation, the gas is usually cooled to a low temperature and then the liquefied gas is transported. The volume of the liquefied gas is greatly reduced, and the transportation cost is reduced. The liquefied cryogenic liquid is stored and transported in a special cryogenic storage tank, and a pump tower is arranged inside the storage tank as a channel for the cryogenic liquid to enter and exit the storage tank.

[0003] In the prior art, the pump tower includes three riser structures fixedly connected to each other by cross beams, and the three risers are arranged in a triangular cross-section. Each riser is hollow, and the three risers are respectively a liquid inlet pipe, a liquid measuring pipe, and a pump liquid pipe. The liquid inlet pipe is used to transport cryogenic liquid into the storage tank, and the pump liquid pipe is used to discharge the cryogenic liquid in the storage tank. When the liquid inlet pipe injects cryogenic liquid into a previously empty storage tank, the jet kinetic energy of the initially injected liquid will cause a large impact on the bottom wall of the storage tank, resulting in damage to the storage tank. Therefore, further improvement is needed. Summary of the Invention

[0004] In order to prevent the fluid from directly impacting the bottom wall of the storage tank and improve the service life of the storage tank, the present application provides an anti-impact structure for liquid inlet of a pump tower.

[0005] An anti-impact structure for liquid inlet of a pump tower provided by the present application adopts the following technical solutions:

[0006] An anti-impact structure for liquid inlet of a pump tower includes a liquid inlet pipe and a guide flow cylinder coaxially and rotatably sleeved on the lower part of the liquid inlet pipe. The upper part of the guide flow cylinder is open for the lower part of the liquid inlet pipe to be inserted, so that the inner cavity of the liquid inlet pipe and the guide flow cylinder is communicated. A guide port communicating with the inner cavity is radially opened on the outer peripheral wall of the lower part of the guide flow cylinder. A plurality of guide ports are provided and distributed around the axis of the guide flow cylinder. A central shaft is coaxially and fixedly connected to the bottom wall of the guide flow cylinder, and an impeller placed inside the liquid inlet pipe is coaxially and fixedly sleeved on the upper part of the central shaft.

[0007] By adopting the above technical solutions, first, an impeller is provided in the liquid inlet pipe. When the liquid in the liquid inlet pipe flows through the impeller, it drives the impeller to rotate. When the impeller rotates passively, part of the fluid kinetic energy is converted into the mechanical energy (rotational kinetic energy) of the impeller, resulting in a decrease in the kinetic energy of the fluid itself. At the same time, the rotation of the impeller will change the flow field distribution of the fluid, and shear stress is generated between the blades of the impeller and the fluid, forming local turbulence and eddy currents, which intensify the energy dissipation of the fluid. Secondly, the vertical jet in the liquid inlet pipe is converted into a horizontal diffusion flow through the diversion cylinder body through the diversion port, preventing the fluid from directly impacting the bottom wall of the storage tank. In addition, the rotation of the impeller drives the diversion cylinder body to rotate relative to the liquid inlet pipe through the central shaft, forcing the fluid to form a swirl, further reducing the fluid kinetic energy.

[0008] Preferably, the bottom plate of the diversion cylinder body is a spherical panel, and the convex side of the spherical panel faces the liquid inlet pipe as the diversion surface, and the center line of the spherical panel is coaxially arranged with the axis of the diversion cylinder body.

[0009] By adopting the above technical solutions, when the fluid passes through the diversion cylinder body, it impacts the spherical panel. The convex structure of the spherical panel can convert the impact force of the fluid into a circularly diffused flow, effectively attenuating the impact force of the fluid, thereby reducing the direct impact of the fluid on the bottom wall of the storage tank and improving the service life of the storage tank.

[0010] Preferably, the outer wall of the lower part of the liquid inlet pipe is fixedly connected with support arms located outside the diversion cylinder body. A plurality of support arms are provided and are spaced apart around the axis of the liquid inlet pipe. The lower ends of the plurality of support arms are fixedly connected with a support ring located below the diversion cylinder body, and the lower end surface of the diversion cylinder body abuts against the upper end surface of the support ring.

[0011] By adopting the above technical solutions, first, the support arms fixedly connected to the outer wall of the lower part of the liquid inlet pipe can provide stable support for the diversion cylinder body, preventing the diversion cylinder body from shifting or tilting under the impact of the fluid and ensuring the normal working state of the diversion cylinder body. Secondly, the design of the plurality of support arms being spaced apart around the axis of the liquid inlet pipe enables the support force to be evenly distributed, further enhancing the structural stability. Finally, the support ring fixedly connected to the lower ends of the support arms provides an additional support point for the diversion cylinder body. The lower end surface of the diversion cylinder body abuts against the upper end surface of the support ring, effectively preventing the diversion cylinder body from sinking excessively, thereby ensuring the reliability and durability of the entire structure.

[0012] Preferably, a bearing groove is coaxially opened on the upper end surface of the support ring, a bearing body is provided on the support ring and is embedded in the bearing groove, and the lower end of the diversion cylinder body is inserted into the inner hole of the bearing body.

[0013] By adopting the above technical solutions, a bearing groove is opened on the upper end surface of the support ring and the bearing body is embedded. The lower end of the diversion cylinder body is inserted into the inner hole of the bearing body, making the relative rotation between the diversion cylinder body and the support ring smoother, effectively reducing the rotational friction resistance, and thereby improving the rotation efficiency of the diversion cylinder body driven by the impeller.

[0014] Preferably, a counterflush box located outside the diversion cylinder body is fixedly penetrated through the support arm. A movable plate is hermetically and slidably connected to the counterflush box. The movable plate slides in a direction approaching or departing from the axis of the diversion cylinder body. A counterflush cavity is formed between the inner plate surface of the movable plate away from the diversion cylinder body and the inner cavity of the counterflush box. The counterflush box is provided with a one-way secondary flow inlet pipe and a one-way secondary flow outlet pipe communicating with the counterflush cavity. One-way valves are provided on both the one-way secondary flow inlet pipe and the one-way secondary flow outlet pipe. The one-way secondary flow outlet pipe communicates with the liquid inlet pipe. The connection port between the one-way secondary flow outlet pipe and the liquid inlet pipe is located below the impeller, and the axis of the connection port between the one-way secondary flow outlet pipe and the liquid inlet pipe is inclined upward. A linkage assembly is arranged between the diversion cylinder body and the movable plate, and the reciprocating movement of the movable plate is realized during the rotation of the diversion cylinder body through the linkage assembly.

[0015] By adopting the above technical solution, when the diversion cylinder body rotates, the movable plate can be driven by the linkage assembly to reciprocate and slide, so that the fluid in the counterflush cavity is periodically sucked and discharged under the action of the one-way valve. The one-way secondary flow outlet pipe is connected to the lower part of the liquid inlet pipe in an inclined manner, and the discharged fluid can form a secondary flow in the direction opposite to the main jet direction. The secondary flow and the main jet are counterflushed, so as to effectively offset the kinetic energy of the main jet in the liquid inlet pipe and further reduce the impact force of the fluid on the bottom wall of the storage tank.

[0016] Preferably, the linkage assembly includes a cam fixedly sleeved on the diversion cylinder body, a first sliding rod fixedly connected to the movable plate and slidably penetrating through the end face of the counterflush box close to the diversion cylinder body, a touch plate fixedly connected to the end of the first sliding rod and located outside the counterflush box, and an elastic member arranged in the counterflush box to force the movable plate to slide and reset in a direction approaching the diversion cylinder body. The elastic member forces the touch plate to abut against the outer peripheral wall of the cam. A through hole for the first sliding rod to penetrate is opened on the end face of the counterflush box close to the diversion cylinder body, and the inner diameter of the through hole is larger than the outer diameter of the first sliding rod.

[0017] By adopting the above technical solution, the cam is fixedly sleeved on the diversion cylinder body. As the diversion cylinder body rotates, the non-circular contour of the cam will periodically push the touch plate to move, thereby driving the first sliding rod to slide, so that the movable plate reciprocates in a direction approaching and departing from the axis of the diversion cylinder body. Secondly, the elastic member is arranged in the counterflush box and can force the movable plate to slide and reset in a direction approaching the diversion cylinder body, ensuring that the movable plate can respond in time when the contour of the cam changes and realizing the continuity and stability of the reciprocating movement. The reciprocating movement of the movable plate causes the fluid in the counterflush cavity to be repeatedly compressed and released, forming an intermittent fluid pulse effect. This pulse effect can effectively disturb the fluid flow state in the liquid inlet pipe and further promote the dissipation of fluid energy.

[0018] Preferably, the elastic member is a spring arranged in the counterflush box. One end of the spring is fixedly connected to the inner wall of the counterflush box, and the other end of the spring is fixedly connected to the movable plate.

[0019] By adopting the above technical solution, the spring is arranged such that the movable plate can slide away from the diversion cylinder body under the action of an external force and quickly reset to a position close to the diversion cylinder body after the external force disappears. This structure ensures the stable reciprocating motion of the movable plate in the linkage assembly, thereby cooperating with the rotation of the diversion cylinder body to realize the periodic suction and discharge of the fluid in the counterpunch chamber.

[0020] Preferably, the linkage assembly includes a second sliding rod fixedly connected to the movable plate and slidably passing through the end face of the counterpunch box close to the diversion cylinder body, a magnetic plate fixedly connected to the end of the second sliding rod and located outside the counterpunch box, a magnetic repulsion plate fixedly connected to the outer wall of the diversion cylinder body, and a magnetic attraction plate fixedly connected to the outer wall of the diversion cylinder body. The magnetic attraction plate and the magnetic repulsion plate are symmetrically arranged. The magnetic plate and the magnetic repulsion plate repel each other with the same polarity, and the magnetic attraction plate and the magnetic plate attract each other with opposite polarities. A through hole for the second sliding rod to pass through is provided on the end face of the counterpunch box close to the diversion cylinder body, and the inner diameter of the through hole is larger than the outer diameter of the second sliding rod.

[0021] By adopting the above technical solution, during the rotation of the diversion cylinder body, the magnetic plate is subjected to the action of the same-polarity repulsion of the magnetic repulsion plate and the opposite-polarity attraction of the magnetic attraction plate, thereby realizing the reciprocating motion of the movable plate. The reciprocating motion of the movable plate changes the volume in the counterpunch chamber, enabling the one-way secondary inflow pipe and the one-way secondary outflow pipe to be alternately conducted, forming a secondary fluid cycle. Without an additional power source, only relying on the rotational motion of the diversion cylinder body can drive the fluid in the counterpunch box to be periodically sucked and discharged, thereby further reducing the fluid kinetic energy and enhancing the energy dissipation effect.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] First, an impeller is arranged in the liquid inlet pipe. When the liquid in the liquid inlet pipe flows through the impeller, it drives the impeller to rotate. When the impeller rotates passively, part of the fluid kinetic energy is converted into the mechanical energy (rotational kinetic energy) of the impeller, resulting in a decrease in the kinetic energy of the fluid itself. At the same time, the rotation of the impeller changes the flow field distribution of the fluid. Shear stress is generated between the blades of the impeller and the fluid, forming local turbulence and eddies, which intensify the energy dissipation of the fluid. Secondly, the vertical jet in the liquid inlet pipe is converted into a horizontal diffusion flow through the diversion port by the diversion cylinder body, preventing the fluid from directly impacting the bottom wall of the storage tank. In addition, the rotation of the impeller drives the diversion cylinder body to rotate relative to the liquid inlet pipe through the central axis, forcing the fluid to form a swirl, further reducing the fluid kinetic energy;

[0024] When the fluid impacts the spherical panel during passing through the diversion cylinder body, the convex structure of the spherical panel can convert the impact force of the fluid into an annular diffused flow, effectively attenuating the impact force of the fluid, thereby reducing the direct impact of the fluid on the bottom wall of the storage tank and improving the service life of the storage tank;

[0025] When the flow guide cylinder rotates, it can drive the movable plate to reciprocate and slide through the linkage component, so that the fluid in the counterpunch cavity can be periodically sucked and discharged under the action of the one-way valve. The one-way secondary outflow pipe is connected to the lower part of the liquid inlet pipe in an inclined manner, and the discharged fluid can form a secondary flow opposite to the main jet direction. The secondary flow and the main jet counterpunch, thereby effectively offsetting the kinetic energy of the main jet in the liquid inlet pipe and further reducing the impact force of the fluid on the bottom wall of the storage tank. Brief Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure of a liquid inlet anti-impact structure in Embodiment 1.

[0027] Figure 2 is a schematic diagram of the connection structure between the flow guide cylinder and the liquid inlet pipe in Embodiment 1.

[0028] Figure 3 is a schematic diagram of the connection structure between the central axis and the spherical panel in Embodiment 1.

[0029] Figure 4 is a schematic diagram of the overall structure of a liquid inlet anti-impact structure in Embodiment 2.

[0030] Figure 5 is a schematic diagram of the structure of the linkage component in Embodiment 2.

[0031] Description of the reference numerals: 1, liquid inlet pipe; 2, flow guide cylinder; 21, flow guide port; 22, spherical panel; 23, cross; 24, central axis; 25, cross plate; 26, impeller; 3, support arm; 31, upper horizontal plate; 32, vertical plate; 33, lower horizontal plate; 34, support ring; 35, bearing body; 4, counterpunch box; 41, movable plate; 42, counterpunch cavity; 43, one-way secondary inflow pipe; 44, one-way secondary outflow pipe; 5, linkage component; 51, cam; 52, first sliding rod; 53, touch plate; 54, spring; 55, second sliding rod; 56, magnetic plate; 57, magnetic repulsion plate; 58, magnetic attraction plate. Detailed Description of the Embodiment

[0032] The following will further describe the present application in detail Figures 1-5 with reference to the attached drawings.

[0033] Embodiment 1: The embodiment of the present application discloses a liquid inlet anti-impact structure for a pump tower. Referring to Figure 1 、 Figure 2 , it includes a liquid inlet pipe 1 and a flow guide cylinder 2 coaxially sleeved and rotatable at the lower part of the liquid inlet pipe 1. The upper part of the flow guide cylinder 2 is open for the lower part of the liquid inlet pipe 1 to be inserted, and the inner cavities of the liquid inlet pipe 1 and the flow guide cylinder 2 are communicated.

[0034] The bottom plate of the diversion cylinder body 2 is a spherical panel 22, and the convex side of the spherical panel 22 faces the liquid inlet pipe 1 as the diversion surface. The center line of the spherical panel 22 and the axis of the diversion cylinder body 2 are coaxially arranged. A diversion port 21 communicating with the inner cavity is radially opened on the outer peripheral wall of the lower part of the diversion cylinder body 2. A plurality of diversion ports 21 are provided and distributed around the axis of the diversion cylinder body 2. The lower surface of the spherical panel 22 is fixedly connected with a cross 23, and the side wall of the cross 23 is fixedly connected to the barrel wall of the diversion cylinder body 2.

[0035] A support arm 3 located outside the diversion cylinder body 2 is fixedly connected to the outer wall of the lower part of the liquid inlet pipe 1. A plurality of support arms 3 are provided and are spaced apart around the axis of the liquid inlet pipe 1. Each support arm 3 includes an upper cross plate 31 fixedly connected to the outer wall of the liquid inlet pipe 1, a vertical plate 32 fixedly connected to the lower end surface of the upper cross plate 31 on the side away from the axis of the liquid inlet pipe 1, and a lower cross plate 33 fixedly connected to the lower end surface of the vertical plate 32 and located below the diversion cylinder body 2. The lower ends of the plurality of support arms 3 are fixedly connected with a support ring 34 located below the diversion cylinder body 2, and the support ring 34 is fixedly connected to the upper end surface of the lower cross plate 33. A bearing groove is coaxially opened on the upper end surface of the support ring 34. The support ring 34 is provided with a bearing body 35 embedded in the bearing groove. The lower end of the diversion cylinder body 2 is inserted into the inner hole of the bearing body 35, and the lower end surface of the diversion cylinder body 2 abuts against the upper end surface of the bearing groove.

[0036] Refer to Figure 2 、 Figure 3 A central shaft 24 is coaxially and fixedly connected to the spherical panel 22. The specific connection structure between the central shaft 24 and the spherical panel 22 is as follows: through holes are respectively penetrated through the centers of the spherical panel 22 and the cross 23. The lower part of the central shaft 24 is inserted through the through hole. A cross plate 25 abutting against the cross 23 is fixedly connected to the lower end of the central shaft 24, and the cross plate 25 is locked to the cross 23 by bolts. An impeller 26 built in the lower part of the liquid inlet pipe 1 is coaxially and fixedly sleeved on the upper part of the central shaft 24. When the liquid in the liquid inlet pipe 1 flows through the impeller 26, the impeller 26 can be driven to rotate.

[0037] A counterflush box 4 is fixedly penetrated through the vertical plate 32 and located outside the diversion cylinder body 2. The length direction of the counterflush box 4 is parallel to the radial direction of the diversion cylinder body 2. A movable plate 41 is hermetically and slidably connected to the counterflush box 4 along its own length direction. A counterflush cavity 42 is formed between the inner plate surface of the movable plate 41 away from the diversion cylinder body 2 and the inner cavity of the counterflush box 4. The counterflush box 4 is provided with a one-way secondary flow inlet pipe 43 and a one-way secondary flow outlet pipe 44 communicating with the counterflush cavity 42. One-way valves are arranged on both the one-way secondary flow inlet pipe 43 and the one-way secondary flow outlet pipe 44. The one-way secondary flow outlet pipe 44 communicates with the liquid inlet pipe 1. The connection port between the one-way secondary flow outlet pipe 44 and the liquid inlet pipe 1 is located below the impeller 26, and the axis of the connection port between the one-way secondary flow outlet pipe 44 and the liquid inlet pipe 1 is inclined upward. A linkage assembly 5 is arranged between the diversion cylinder body 2 and the movable plate 41, and the reciprocating movement of the movable plate 41 is realized during the rotation of the diversion cylinder body 2 through the linkage assembly 5.

[0038] In this embodiment, the linkage assembly 5 includes a cam 51 fixedly sleeved on the diversion cylinder 2, a first slide bar 52 fixedly connected to the movable plate 41 and slidably passing through the end face of the counterpunch box 4 close to the diversion cylinder 2, a trigger plate 53 fixedly connected to the end of the first slide bar 52 and externally disposed in the counterpunch box 4, and an elastic member disposed in the counterpunch box 4 to force the movable plate 41 to slide and reset in the direction close to the diversion cylinder 2. The elastic member forces the trigger plate 53 to abut against the outer peripheral wall of the cam 51. A through hole for the first slide bar 52 to pass through is formed in the end face of the counterpunch box 4 close to the diversion cylinder 2, and the inner diameter of the through hole is larger than the outer diameter of the first slide bar 52. The elastic member is a spring 54 disposed in the counterpunch box 4. One end of the spring 54 is fixedly connected to the inner wall of the counterpunch box 4, and the other end of the spring 54 is fixedly connected to the movable plate 41.

[0039] The implementation principle of an impact prevention structure for the liquid inlet of a pump tower in an embodiment of the present application is as follows: First, an impeller 26 is provided in the liquid inlet pipe 1. When the liquid in the liquid inlet pipe 1 flows through the impeller 26, the impeller 26 is driven to rotate. When the impeller 26 rotates passively, part of the fluid kinetic energy is converted into the mechanical energy (rotational kinetic energy) of the impeller 26, resulting in a decrease in the kinetic energy of the fluid itself. At the same time, shear stress is generated between the blades of the impeller 26 and the fluid, forming local turbulence and eddy currents, which intensify the energy dissipation of the fluid. Second, when the fluid passes through the diversion cylinder 2, it impacts the spherical panel 22. The convex structure of the spherical panel 22 can convert the impact force of the fluid into a circularly diffused flow, converting the vertical jet in the liquid inlet pipe 1 into a horizontally diffused flow through the diversion port 21, preventing the fluid from directly impacting the bottom wall of the storage tank. In addition, the rotation of the impeller 26 drives the diversion cylinder 2 to rotate relative to the liquid inlet pipe 1 through the central shaft 24, forcing the fluid to form a swirling flow, further reducing the fluid kinetic energy.

[0040] During the process of the impeller 26 rotating to drive the diversion cylinder 2 to rotate, the cam 51 rotates with the diversion cylinder 2. The non-circular contour of the cam 51 periodically pushes the trigger plate 53 to move, thereby driving the first slide bar 52 to slide, so that the movable plate 41 reciprocates in the direction close to and away from the axis of the diversion cylinder 2. The spring 54 can force the movable plate 41 to slide and reset in the direction close to the diversion cylinder 2, ensuring that the movable plate 41 can respond in a timely manner when the contour of the cam 51 changes, realizing the reciprocating sliding movement of the movable plate 41; the reciprocating sliding movement of the movable plate 41 causes the fluid in the counterpunch cavity 42 to be repeatedly compressed and released. Under the action of the one-way valve, the fluid in the counterpunch cavity 42 is periodically inhaled and discharged. The external fluid is inhaled into the counterpunch cavity 42 from the one-way secondary flow inlet pipe 43, and the fluid discharged from the one-way secondary outlet pipe 44 can form a secondary flow in the direction opposite to the main jet direction of the liquid inlet pipe 1. The secondary flow and the main jet counteract each other, thereby effectively offsetting the kinetic energy of the main jet in the liquid inlet pipe 1 and reducing the impact force of the fluid on the spherical panel 22.

[0041] Embodiment 2:

[0042] The difference between this embodiment and Embodiment 1 lies in referring to Figure 4 , Figure 5 , in the embodiment, two groups of support arms 3 are provided and symmetrically distributed along the axis of the liquid inlet pipe 1. The linkage assembly 5 includes a second sliding rod 55 fixedly connected to the movable plate 41 and slidably passing through the end face of the counter-flushing box 4 close to the guide flow cylinder 2, a magnetic force plate 56 fixedly connected to the end of the second sliding rod 55 and externally disposed outside the counter-flushing box 4, a magnetic repulsion plate 57 fixedly connected to the outer wall of the guide flow cylinder 2, and a magnetic attraction plate 58 fixedly connected to the outer wall of the guide flow cylinder 2. The magnetic attraction plate 58 and the magnetic repulsion plate 57 are located above the diversion port 21, and the magnetic attraction plate 58 and the magnetic repulsion plate 57 are symmetrically arranged along the axis of the guide flow cylinder 2. The magnetic force plate 56 and the magnetic repulsion plate 57 repel each other with the same polarity, and the magnetic attraction plate 58 and the magnetic force plate 56 attract each other with opposite polarities. A through hole for the second sliding rod 55 to pass through is formed in the end face of the counter-flushing box 4 close to the guide flow cylinder 2, and the inner diameter of the through hole is larger than the outer diameter of the second sliding rod 55.

[0043] The implementation principle of the liquid inlet anti-impact structure of the pump tower in the embodiment of the present application is as follows: during the rotation of the guide flow cylinder 2, when the magnetic attraction plate 58 rotates to a position corresponding to the magnetic force plate 56, the magnetic force plate 56 is attracted by the magnetic attraction plate 58 with opposite polarities, and the magnetic force plate 56 slides towards the direction close to the guide flow cylinder 2, so that the volume of the counter-flushing cavity 42 increases, and the external fluid enters the counter-flushing cavity 42 through the one-way secondary flow inlet pipe 43. The guide flow cylinder 2 continues to rotate. When the magnetic repulsion plate 57 rotates to a position corresponding to the magnetic force plate 56, due to the magnetic repulsion between the magnetic force plate 56 and the magnetic repulsion plate 57 with the same polarity, the magnetic force plate 56 slides away from the guide flow cylinder 2. The fluid in the counter-flushing cavity 42 discharged from the one-way secondary flow outlet pipe 44 can form a secondary flow opposite to the main jet direction of the liquid inlet pipe 1, and the secondary flow and the main jet are in counter-flush.

[0044] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A liquid inlet anti-shock structure for a pump tower, characterized in that: It includes a liquid inlet pipe (1) and a diversion cylinder body (2) coaxially and rotatably sleeved on the lower part of the liquid inlet pipe (1). The upper part of the diversion cylinder body (2) is open for the lower part of the liquid inlet pipe (1) to be inserted, so that the inner cavities of the liquid inlet pipe (1) and the diversion cylinder body (2) are communicated. A diversion port (21) communicating with the inner cavity is radially opened on the outer peripheral wall of the lower part of the diversion cylinder body (2). There are multiple diversion ports (21) and they are distributed around the axis of the diversion cylinder body (2). A central shaft (24) is coaxially and fixedly connected to the bottom wall of the diversion cylinder body (2). An impeller (26) built in the liquid inlet pipe (1) is coaxially and fixedly sleeved on the upper part of the central shaft (24); A support arm (3) located outside the diversion cylinder body (2) is fixedly connected to the outer wall of the lower part of the liquid inlet pipe (1). There are multiple support arms (3) and they are spaced apart around the axis of the liquid inlet pipe (1). The lower ends of the multiple support arms (3) are fixedly connected to a support ring (34) located below the diversion cylinder body (2). The lower end face of the diversion cylinder body (2) abuts against the upper end face of the support ring (34); A counter-flushing box (4) located outside the diversion cylinder body (2) is fixedly penetrated by the support arm (3). A movable plate (41) is hermetically and slidably connected to the counter-flushing box (4). The movable plate (41) slides in a direction close to or away from the axis of the diversion cylinder body (2). A counter-flushing cavity (42) is formed between the inner plate surface of the movable plate (41) away from the diversion cylinder body (2) and the inner cavity of the counter-flushing box (4). The counter-flushing box (4) is provided with a one-way secondary flow inlet pipe (43) and a one-way secondary flow outlet pipe (44) communicating with the counter-flushing cavity (42). One-way valves are arranged on both the one-way secondary flow inlet pipe (43) and the one-way secondary flow outlet pipe (44). The one-way secondary flow outlet pipe (44) communicates with the liquid inlet pipe (1). The connection port of the one-way secondary flow outlet pipe (44) and the liquid inlet pipe (1) is located below the impeller (26), and the axis of the connection port of the one-way secondary flow outlet pipe (44) and the liquid inlet pipe (1) is inclined upward. A linkage assembly (5) is arranged between the diversion cylinder body (2) and the movable plate (41). Through the linkage assembly (5), the reciprocating movement of the movable plate (41) is realized during the rotation of the diversion cylinder body (2).

2. The liquid inlet anti-shock structure of a pump tower according to claim 1, characterized in that: The bottom plate of the diversion cylinder body (2) is a spherical panel (22), and the convex side of the spherical panel (22) faces the liquid inlet pipe (1) as a diversion surface. The center line of the spherical panel (22) is coaxially arranged with the axis of the diversion cylinder body (2).

3. The liquid inlet anti-shock structure of a pump tower according to claim 1, characterized in that: A bearing groove is coaxially opened on the upper end face of the support ring (34). A bearing body (35) embedded in the bearing groove is arranged on the support ring (34). The lower end of the diversion cylinder body (2) is inserted into the inner hole of the bearing body (35).

4. The liquid inlet anti-shock structure of a pump tower according to claim 1, characterized in that: The linkage assembly (5) includes a cam (51) fixedly sleeved on the diversion cylinder body (2), a first sliding rod (52) fixedly connected to the movable plate (41) and slidably passing through the end face of the impact box (4) close to the diversion cylinder body (2), a trigger plate (53) fixedly connected to the end of the first sliding rod (52) and located outside the impact box (4), and an elastic member arranged in the impact box (4) to force the movable plate (41) to slide and reset towards the direction close to the diversion cylinder body (2). The elastic member forces the trigger plate (53) to abut against the outer peripheral wall of the cam (51). A through hole for the first sliding rod (52) to pass through is formed in the end face of the impact box (4) close to the diversion cylinder body (2), and the inner diameter of the through hole is larger than the outer diameter of the first sliding rod (52).

5. The anti-shock structure for liquid inlet of a pump tower according to claim 4, wherein: The elastic member is a spring (54) arranged inside the impact box (4). One end of the spring (54) is fixedly connected to the inner wall of the impact box (4), and the other end of the spring (54) is fixedly connected to the movable plate (41).

6. The liquid inlet anti-shock structure of a pump tower according to claim 1, wherein: The linkage assembly (5) includes a second sliding rod (55) fixedly connected to the movable plate (41) and slidably passing through the end face of the impact box (4) close to the diversion cylinder body (2), a magnetic force plate (56) fixedly connected to the end of the second sliding rod (55) and located outside the impact box (4), a magnetic repulsion plate (57) fixedly connected to the outer wall of the diversion cylinder body (2), and a magnetic attraction plate (58) fixedly connected to the outer wall of the diversion cylinder body (2). The magnetic attraction plate (58) and the magnetic repulsion plate (57) are symmetrically arranged. The magnetic force plate (56) and the magnetic repulsion plate (57) repel each other with the same polarity, and the magnetic attraction plate (58) and the magnetic force plate (56) attract each other with opposite polarities. A through hole for the second sliding rod (55) to pass through is formed in the end face of the impact box (4) close to the diversion cylinder body (2), and the inner diameter of the through hole is larger than the outer diameter of the second sliding rod (55).

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