A submersible pump with a low-wear impeller

Abstract

The present invention relates to the technical field of submersible pumps, and discloses a submersible pump with a low-wear impeller, which solves the problem that when a conventional submersible pump is used in a water environment containing solid particles, the particles will cause greater erosion wear on the surface of the subsequent blades along the water flow direction. The setting of the shunt ring and the concave arc surface on the side close to the vane impeller facilitates the concentration of the particulate matter with greater centrifugal force in the water flow to the area close to the arc surface, so as to conveniently concentrate and collect it into the S-shaped slow-flow cavity through the narrow channel, avoiding the solid particles in this part from flowing through to the next vane impeller, thereby damaging the surface of the vane impeller; and a water passage hole communicating with the middle of the diversion cavity is provided on the other side in the S-shaped slow-flow cavity, which facilitates the flow of water in the S-shaped slow-flow cavity and enables the water in the narrow channel to flow at a high speed, making it have a load-bearing capacity. On the other hand, it can also cause the particulate matter to gather on the surface of the filter screen for centralized treatment by the cleaning mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of submersible pumps, and particularly to a submersible pump with a low-wear impeller. Background Art

[0002] A submersible pump is a pump used for transporting liquids. It is usually installed underwater and can be directly immersed in the water source to work. Its main components include a main shaft, a centrifugal impeller, and a pump casing. There are multiple centrifugal impellers arranged coaxially, and auxiliary accessories such as bearings, shaft sleeves, and filter screens are used to form the final submersible pump product.

[0003] Centrifugal impellers are generally divided into channel impellers and vane impellers. Channel impellers allow solid particles and long fiber materials to pass through, reducing blockages. The shape and number of the vanes of vane impellers help increase the pressure and flow rate of the pump, enabling long-distance transmission. It is suitable for clean water or liquids with only slight pollution. In this case, for vane impellers, there are small solid particles in the underwater environment. These particles will impact the surface of the vanes under the drive of the high-speed rotation of the impeller, causing erosion wear. This erosion wear occurs on multiple impellers, resulting in varying degrees of wear. The reason is that the particles in the water will cause erosion when passing through different impellers. Especially for the impellers at the back, the water flow velocity gradually increases, and the kinetic energy carried by the solid particles is greater, causing more serious erosion wear to the vanes. Summary of the Invention

[0004] The purpose of the present invention is to provide a submersible pump with a low-wear impeller, which solves the problem that in a water environment containing solid particles, the particles will cause more serious erosion wear to the surfaces of the subsequent vanes along the water flow direction.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A submersible pump with a low-wear impeller, including a submersible motor, and multiple impeller mechanisms coaxially connected to the submersible motor. A filter screen is connected between the submersible motor and the adjacent impeller mechanism. The impeller mechanism includes a pump casing. An impeller assembly is installed in the pump casing. The impeller assembly includes a vane impeller that rotates to drive the water flow. A diversion cavity communicating with the water outlet of the vane impeller is also provided in the pump casing. For the impeller mechanism close to the filter screen, a diversion ring is provided around the water outlet of the vane impeller. An S-shaped slow-flow cavity is provided in the pump casing above the diversion ring. A diversion plate is fixedly provided between the diversion cavity and the diversion ring. The diversion plate and the side surface of the diversion ring form a narrow channel with a cross-section smaller than that of the diversion cavity and lead to the cavity of the S-shaped slow-flow cavity. The side of the diversion ring close to the vane impeller is provided with a concave arc surface with an upward radian. The concave arc surface is used to guide the water horizontally ejected by the vane impeller to change the direction and respectively guide it into the S-shaped slow-flow cavity and the diversion cavity.

[0006] On the side of the inner wall of the S-shaped slow-flow cavity away from the flow splitting ring, there are water flow holes, which communicate with the middle part of the diversion cavity. A filter screen is arranged on the side of the S-shaped slow-flow cavity close to the water flow holes, and the filter screen divides the S-shaped slow-flow cavity into two cavities.

[0007] As a further description of the above technical solution: A direct-current cavity connected to the horizontal docking vane impeller is communicated with the lower side of the diversion cavity, and a guide plate parallel to the water flow throwing direction of the vane impeller is annularly arranged in the direct-current cavity.

[0008] As a further description of the above technical solution: A chute A is arranged in the pump housing, and the chute A is used for movably installing the flow splitting ring. A plurality of protrusions are annularly arranged on the inner concave arc surface of the flow splitting ring, and the protrusions are parallel to the direction of the water flow thrown by the vane impeller flowing into the diversion cavity.

[0009] As a further description of the above technical solution: A plurality of cleaning mechanisms for cleaning the lower surface of the filter screen are fixedly connected to the upper side of the flow splitting ring. The cleaning mechanism includes a support frame, the support frame is fixed on one side of the flow splitting ring through a fixing block, a cleaning roller is rotatably installed inside the support frame, and a whistle-shaped yarn separating net is arranged on the horizontal side of the cleaning roller. The upper side of the cleaning roller is attached to the lower surface of the filter screen, the inlet of the whistle-shaped yarn separating net is aligned with the part where the cleaning roller and the filter screen are attached, and a driving component for driving the cleaning roller to rotate is further arranged on the outer side of the support frame.

[0010] As a further description of the above technical solution: The driving component includes a roller rotatably installed on the outer surface of the support frame. A first gear is coaxially fixed to one side of the roller, a second speed-changing gear with a diameter smaller than that of the first gear is meshed and connected to one side of the first gear, another second speed-changing gear is coaxially connected to one side of the second speed-changing gear, a third speed-changing gear with a diameter smaller than that of the other second speed-changing gear is meshed and connected to one side of the third speed-changing gear, the third speed-changing gear is coaxially connected to the cleaning roller, and the upper surface of the roller is pressed against the lower surface of the lower convex edge in the S-shaped slow-flow cavity.

[0011] As a further description of the above technical solution: An annular chute B is arranged on the side of the inner wall of the S-shaped slow-flow cavity corresponding to the support frame horizontally. A sand cleaning hole communicating with the outer surface of the pump housing is arranged on the inner wall of the chute B. A common sliding ring is connected to the outer sides of a plurality of the support frames. A through alignment hole communicating with the inner side of the whistle-shaped yarn separating net is arranged on the side surface of the sliding ring. The sliding ring is hermetically slid inside the chute B, and the alignment hole is movably communicated with the sand cleaning hole.

[0012] As a further description of the above technical solution: The number of the sand cleaning holes and the number of the alignment holes are relatively prime numbers, and the number of the sand cleaning holes is less than the number of the alignment holes.

[0013] As a further description of the above technical solution: The whistle-shaped yarn separating net and the filter screen adopt rigid filter meshes.

[0014] As a further description of the above technical solution: The pump casing includes an upper casing on the upper side and a lower casing on the lower side. The connection position of the upper casing and the lower casing is arranged in the S-shaped slow-flow cavity, and the upper casing and the lower casing are detachably connected by bolts and sealing rings.

[0015] To sum up, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: The setting of the diversion ring and the concave arc surface on the side close to the vane impeller facilitates the concentration of the particulate matter with greater centrifugal force in the flowing water to the area close to the arc surface, so as to conveniently concentrate and collect it into the S-shaped slow-flow cavity through the narrow channel, avoiding the flow of the solid particles in this part to the next vane impeller, thereby causing damage to the surface of the vane impeller; and there is a water passage hole on the other side of the S-shaped slow-flow cavity that communicates with the middle of the diversion cavity, which facilitates the flow of water in the S-shaped slow-flow cavity and enables the water in the narrow channel to flow at a high speed, endowing it with load-bearing capacity. On the other hand, it can also cause the particulate matter to gather on the surface of the filter screen for centralized treatment by the cleaning mechanism; the side surface of the pump casing is provided with a sand cleaning hole that is movably communicated with the cleaning mechanism, which uses the high-pressure water stored in the S-shaped slow-flow cavity to automatically discharge the solid particles stored in the cleaning mechanism to the outside of the pump casing, and also realizes the effect of automatic cleaning. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the impeller mechanism of the present invention near the filter screen;

[0018] Figure 3 It is a schematic diagram of the first cross-sectional structure of the impeller mechanism of the present invention;

[0019] Figure 4 It is of the present invention Figure 3 Schematic diagram of A in;

[0020] Figure 5 It is a schematic diagram of the second cross-sectional structure of the impeller mechanism of the present invention;

[0021] Figure 6 It is a schematic diagram of the exploded structure of the impeller mechanism of the present invention;

[0022] Figure 7 It is a schematic diagram of the split structure of the upper casing and the diversion ring of the present invention;

[0023] Figure 8 It is of the present invention Figure 7 Schematic diagram of B in;

[0024] Figure 9 It is a schematic diagram of the cleaning mechanism of the present invention;

[0025] Figure 10 Schematic structural diagram of the driving component, cleaning roller and whistle-shaped yarn separating net of the present invention;

[0026] Figure 11 Schematic structural diagram of the positional relationship between the sand cleaning hole and the alignment hole of the present invention.

[0027] In the figure: 10, pump housing; 11, upper housing; 12, lower housing; 13, chute A; 20, impeller assembly; 21, vane impeller; 30, diversion cavity; 31, DC cavity; 32, diversion plate; 33, shunt plate; 40, shunt ring; 41, protrusion; 50, S-shaped slow flow cavity; 51, water passage hole; 52, filter screen; 53, chute B; 54, lower convex edge; 55, sand cleaning hole; 60, cleaning mechanism; 61, slip ring; 611, alignment hole; 62, support frame; 63, fixing block; 64, cleaning roller; 65, whistle-shaped yarn separating net; 66, driving component; 661, roller; 662, first gear; 663, second speed-changing gear; 664, third speed-changing gear. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] To further understand the content of the present invention, the present invention will be described in detail in conjunction with the drawings.

[0030] Combined with Figures 1-11 , a submersible pump with a low-wear impeller includes a submersible motor and a plurality of impeller mechanisms coaxially connected to the submersible motor. A filter screen is connected between the submersible motor and the adjacent impeller mechanism. The impeller mechanism includes a pump housing 10. An impeller assembly 20 is installed in the pump housing 10. The impeller assembly 20 includes a vane impeller 21 that rotates to drive water flow. A diversion cavity 30 communicating with the water outlet of the vane impeller 21 is also provided in the pump housing 10. For the impeller mechanism close to the filter screen, a shunt ring 40 is provided outside the water outlet of the vane impeller 21. An S-shaped slow flow cavity 50 is provided in the pump housing 10 above the shunt ring 40. A shunt plate 33 is fixedly provided between the diversion cavity 30 and the shunt ring 40. A narrow channel with a cross-section smaller than that of the diversion cavity 30 is formed between the shunt plate 33 and the side surface of the shunt ring 40 and leads to the cavity of the S-shaped slow flow cavity 50. The side of the shunt ring 40 close to the vane impeller 21 is provided with a concave arc surface with an upward arc. The concave arc surface is used to guide the water horizontally thrown out by the vane impeller 21 to change the direction and respectively guide it into the S-shaped slow flow cavity 50 and the diversion cavity 30;

[0031] On the side of the inner wall of the S-shaped slow-flow cavity 50 away from the flow-dividing ring 40, there are water flow holes 51 opened, and the water flow holes 51 communicate with the middle part of the diversion cavity 30. On the side of the S-shaped slow-flow cavity 50 close to the water flow holes 51, there is a filter screen 52, and the filter screen 52 divides the S-shaped slow-flow cavity 50 into two cavities;

[0032] The above working principle and technical effect are as follows: The water centrifugally thrown out by the vane impeller 21 in the horizontal direction, under the redirecting action of the concave arc surface on one side of the flow-dividing ring 40, the water close to the concave arc surface will enter the S-shaped slow-flow cavity 50 through the narrow channel between the flow-dividing ring 40 and the flow-dividing plate 33, while the water far from the concave arc surface will enter the diversion cavity 30 and lead to the next connected impeller mechanism. Among them, when the water flow thrown out by the vane impeller 21 carries solid particles, in the horizontal direction, under the action of a large centrifugal force, it will move towards the concave arc surface, and finally its direction is changed by the concave arc surface, and it moves along the direction of the arc surface with the water flow through the narrow channel into the S-shaped slow-flow cavity 50. After the particles enter the S-shaped slow-flow cavity 50, the flow rate of the water decreases, greatly weakening the kinetic energy of the particles, thereby reducing its destructiveness;

[0033] Also, because there is a water flow hole 51 on the other side of the S-shaped slow-flow cavity 50 communicating with the middle part of the diversion cavity 30, the high-speed flowing water in the diversion cavity 30 will cause suction force on the water flow hole 51, sucking the water in the S-shaped slow-flow cavity 50 back into the diversion cavity 30 again. In this way, the water in the S-shaped slow-flow cavity 50 forms a flow from the narrow channel towards the water flow hole 51. On the one hand, the water in the narrow channel can pass through at a certain flow rate, so that the water with a certain flow rate has a load-bearing capacity, so that when the particles enter the narrow channel, the water flow has the ability to bring the particles into the S-shaped slow-flow cavity 50; on the other hand, it can promote the water flow in the S-shaped slow-flow cavity 50 to move towards the water flow hole 51, so that the filter screen 52 can effectively concentrate and adsorb the particles on the surface; in addition, the whole process does not affect the water pressurization and speed increase effects of the impeller mechanism.

[0034] Further, a direct-current cavity 31 communicating with the vane impeller 21 horizontally is connected to the lower side of the diversion cavity 30, and a diversion plate 32 parallel to the water flow throwing direction of the vane impeller 21 is annularly arranged in the direct-current cavity 31;

[0035] The purpose of setting the diversion plate 32 is to effectively reduce the phenomenon of vortex generation in the water flow centrifugally thrown out by the vane impeller 21 and avoid the vortex from affecting the movement of the solid particles towards the arc surface of the flow-dividing ring 40.

[0036] Further, a chute A13 is opened in the pump housing 10, and the chute A13 is used for movably installing the flow-dividing ring 40. A plurality of protrusions 41 are annularly arranged on the inner concave arc surface of the flow-dividing ring 40, and the protrusions 41 are parallel to the direction of the water flow thrown out by the vane impeller 21 flowing into the diversion cavity 30;

[0037] The water flow centrifugally thrown out by the vane impeller 21 impacts on the surface of the diversion ring 40 with the protrusions 41, facilitating the rotation of the diversion ring 40 in the chute A13, and further causing the part of the upper side of the diversion ring 40 located in the S-shaped slow flow cavity 50 to also rotate in the S-shaped slow flow cavity 50.

[0038] In the previous embodiment: A plurality of cleaning mechanisms 60 for cleaning the lower surface of the filter screen 52 are fixedly connected to the upper side of the diversion ring 40. The cleaning mechanism 60 includes a support frame 62. The support frame 62 is fixed to one side of the diversion ring 40 through a fixing block 63. A cleaning roller 64 is rotatably installed inside the support frame 62, and a whistle-shaped yarn separating net 65 is arranged on the horizontal side of the cleaning roller 64. The upper side of the cleaning roller 64 is attached to the lower surface of the filter screen 52. The inlet of the whistle-shaped yarn separating net 65 is aligned with the part where the cleaning roller 64 and the filter screen 52 are attached. A driving assembly 66 for driving the cleaning roller 64 to rotate is also provided on the outer side of the support frame 62;

[0039] The above working principle and technical effect are: The rotating diversion ring 40 drives the support frame 62 to move annularly on the lower surface of the filter screen 52. During the movement, the rotating cleaning roller 64 is responsible for cleaning the solid particles adsorbed on the lower surface of the filter screen 52 into the inner side of the whistle-shaped yarn separating net 65 for centralized storage, avoiding the long-term attachment of particles on the lower surface of the filter screen 52 and affecting the water flow effect in the S-shaped slow flow cavity 50;

[0040] The upper side of the whistle-shaped yarn separating net 65 and the adjacent mesh surface of the filter screen 52 are closed, not visible in the figure. Therefore, when the particles enter the inner side of the whistle-shaped yarn separating net 65, they are not affected by the adsorption effect of the mesh surface of the filter screen 52.

[0041] Furthermore, the driving assembly 66 includes a roller 661 rotatably installed on the outer surface of the support frame 62. One side of the roller 661 is coaxially fixedly connected with a first gear 662. One side of the first gear 662 is meshed with a second speed-changing gear 663 with a diameter smaller than it. One side of the second speed-changing gear 663 is coaxially connected with another second speed-changing gear 663. One side of the other second speed-changing gear 663 is meshed with a third speed-changing gear 664 with a diameter smaller than it. The third speed-changing gear 664 is coaxially connected with the cleaning roller 64. The upper surface of the roller 661 is pressed against the lower surface of the lower convex edge 54 in the S-shaped slow flow cavity 50;

[0042] As the support frame 62 moves on the lower surface of the filter screen 52, the drive assembly 66 pressed against the lower surface of the lower convex edge 54 also rolls, thereby causing the cleaning roller 64 to rotate rapidly in the direction opposite to the moving direction through the first gear 662, the second speed-changing gear 663, and the third speed-changing gear 664, so as to achieve the purpose of cleaning the lower surface of the filter screen 52. The whistle-shaped spacer screen 65 is arranged on one side in the rotation direction of the cleaning roller 64, and a closed cover is provided outside the first gear 662, the second speed-changing gear 663, and the third speed-changing gear 664 to shield them.

[0043] In the previous embodiment: an annular chute B53 is provided on the inner wall of the S-shaped slow-flow cavity 50 corresponding to the support frame 62 horizontally. A sand cleaning hole 55 communicating with the outer surface of the pump housing 10 is provided on the inner wall of the chute B53. A common slip ring 61 is connected to the outside of a plurality of support frames 62. A through alignment hole 611 communicating with the inside of the whistle-shaped spacer screen 65 is provided on the side surface of the slip ring 61. The slip ring 61 is hermetically slid inside the chute B53, and the alignment hole 611 is movably communicated with the sand cleaning hole 55.

[0044] The above working principle and technical effect are as follows: affected by the water pressure in the pump housing 10, the water pressure in the S-shaped slow-flow cavity 50 is also much higher than the water pressure in the external environment of the pump housing 10. Therefore, as the support frame 62 moves annularly in the S-shaped slow-flow cavity 50, the slip ring 61 is driven to move inside the chute B53. When the alignment hole 611 and the sand cleaning hole 55 are communicated for a short time, the high-pressure water in the S-shaped slow-flow cavity 50 will flow rapidly to the outside of the pump housing 10 through the alignment hole 611 and the sand cleaning hole 55. During this process, the solid particles accumulated in the whistle-shaped spacer screen 65 will be carried out to the outside of the pump housing 10, so as to achieve the purpose of automatically cleaning the solid particles in the whistle-shaped spacer screen 65.

[0045] Furthermore, the number of sand cleaning holes 55 provided and the number of alignment holes 611 provided are relatively prime numbers, and the number of sand cleaning holes 55 provided is less than the number of alignment holes 611 provided.

[0046] This can avoid the situation where a plurality of sand cleaning holes 55 and a plurality of alignment holes 611 are communicated at the same time, thereby causing the problem that the flow rate of water pressure relief of a single communicated sand cleaning hole 55 and alignment hole 611 is reduced, resulting in a poor effect of discharging solid particles.

[0047] Furthermore, the whistle-shaped spacer screen 65 and the filter screen 52 are made of rigid filter meshes.

[0048] In response to the change in water pressure within the S-shaped slow-flow cavity 50, the whistle-shaped screen 65 adopts a rigid filter screen, which is not easily deformed by water pressure and is more likely to cause particulate matter to detach from the surface of the screen, thus facilitating discharge; the filter screen 52 adopts a rigid filter screen, which facilitates the cleaning roller 64 that rotates to better exert force on the lower surface of the filter screen 52, so as to better clean the particulate matter adhering to its lower surface.

[0049] Furthermore, the pump housing 10 includes an upper housing 11 on the upper side and a lower housing 12 on the lower side. The connection position of the upper housing 11 and the lower housing 12 is arranged within the S-shaped slow-flow cavity 50. The upper housing 11 and the lower housing 12 are detachably connected by bolts and sealing rings;

[0050] Due to the detachable connection of the upper housing 11 and the lower housing 12, it is convenient for subsequent maintenance and repair of the S-shaped slow-flow cavity 50, the flow dividing ring 40, and the cleaning mechanism 60.

[0051] Working principle: The water centrifugally thrown out horizontally by the vane impeller 21, under the action of the concave arc surface on one side of the flow dividing ring 40, the water close to the concave arc surface enters the S-shaped slow-flow cavity 50 through the narrow channel between the flow dividing ring 40 and the flow dividing plate 33, while the water far from the concave arc surface enters the diversion cavity 30 and leads to the next connected impeller mechanism. Among them, when the flowing water thrown out by the vane impeller 21 carries solid particulate matter, it is under the action of a large centrifugal force in the horizontal direction and moves towards the concave arc surface, and then follows the arc surface along with the water flow through the narrow channel into the S-shaped slow-flow cavity 50, and then is connected to the middle of the diversion cavity 30 through the water passage hole 51 provided on the other side of the S-shaped slow-flow cavity 50, promoting the water flow in the S-shaped slow-flow cavity 50 to move towards the direction of the water passage hole 51, so that the filter screen 52 can effectively concentrate and adsorb the particulate matter on the surface;

[0052] Immediately afterwards, the rotating flow dividing ring 40 drives the support frame 62 to move annularly on the lower surface of the filter screen 52. During the movement, the drive assembly 66 pressed against the lower surface of the lower convex edge 54 rolls, and drives the cleaning roller 64 to rotate rapidly through the linkage of the first gear 662, the second transmission gear 663, and the third transmission gear 664. The rotating cleaning roller 64 is responsible for cleaning the solid particulate matter adsorbed on the lower surface of the filter screen 52 to the inside of the whistle-shaped screen 65 for centralized storage. Then, the annular movement of the support frame 62 within the S-shaped slow-flow cavity 50 drives the slip ring 61 to move inside the chute B53. When the alignment hole 611 is briefly connected to the sand cleaning hole 55, the high-pressure water in the S-shaped slow-flow cavity 50 will quickly flow out of the pump housing 10 through the alignment hole 611 and the sand cleaning hole 55. This process will carry out the solid particles collected in the whistle-shaped screen 65 to the outside of the pump housing 10, thus achieving the purpose of automatically cleaning the solid particles in the whistle-shaped screen 65.

[0053] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submersible pump with a low-wear impeller, comprising a submersible motor, and a plurality of impeller mechanisms coaxially connected to the submersible motor. A filter screen is connected between the submersible motor and the adjacent impeller mechanism. The impeller mechanism includes a pump casing (10), an impeller assembly (20) is installed in the pump casing (10), the impeller assembly (20) includes a vane impeller (21) that rotates to drive water flow, and a diversion cavity (30) communicating with the water outlet of the vane impeller (21) is further formed in the pump casing (10). It is characterized in that: For the impeller mechanism near the filter screen, a diversion ring (40) is provided around the water outlet of the vane impeller (21). An S-shaped flow-attenuating cavity (50) is formed above the diversion ring (40) inside the pump casing (10). A diversion plate (33) is fixedly arranged between the diversion cavity (30) and the diversion ring (40). The diversion plate (33) and the side surface of the diversion ring (40) form a narrow channel with a cross-section smaller than that of the diversion cavity (30) and lead to the inside of the S-shaped flow-attenuating cavity (50). On the side of the diversion ring (40) close to the vane impeller (21), there is a concave arc surface with an upward radian. The concave arc surface is used to guide the water horizontally ejected by the vane impeller (21) to change the direction and respectively guide it into the S-shaped flow-attenuating cavity (50) and the diversion cavity (30). On the side of the inner wall of the S-shaped flow-attenuating cavity (50) away from the diversion ring (40), a water passage hole (51) is formed. The water passage hole (51) communicates with the middle part of the diversion cavity (30). A filter screen (52) is arranged on the side of the S-shaped flow-attenuating cavity (50) close to the water passage hole (51). The filter screen (52) divides the S-shaped flow-attenuating cavity (50) into two cavities.

2. The submersible pump with a low-wear impeller according to claim 1, characterized in that: A direct-current cavity (31) horizontally connected to the vane impeller (21) is communicated with the lower side of the diversion cavity (30). A diversion plate (32) parallel to the water ejection direction of the vane impeller (21) is annularly arranged in the direct-current cavity (31).

3. The submersible pump with a low-wear impeller according to claim 1, characterized in that: A chute A (13) is formed inside the pump casing (10). The chute A (13) is used for movably installing the diversion ring (40). A plurality of protrusions (41) are annularly arranged on the inner concave arc surface of the diversion ring (40). The protrusions (41) are parallel to the direction of the water flow ejected by the vane impeller (21) flowing into the diversion cavity (30).

4. The submersible pump with a low-wear impeller according to claim 3, characterized in that: A plurality of cleaning mechanisms (60) for cleaning the lower surface of the filter screen (52) are fixedly connected to the upper side of the diversion ring (40). The cleaning mechanism (60) includes a support frame (62). The support frame (62) is fixed to one side of the diversion ring (40) through a fixing block (63). A cleaning roller (64) is rotatably installed inside the support frame (62), and a whistle-shaped spacer screen (65) is arranged on the horizontal side of the cleaning roller (64). The upper side of the cleaning roller (64) is attached to the lower surface of the filter screen (52). The inlet of the whistle-shaped spacer screen (65) is aligned with the part where the cleaning roller (64) and the filter screen (52) are attached. A driving component (66) for driving the cleaning roller (64) to rotate is further arranged on the outer side of the support frame (62).

5. The submersible pump with a low-wear impeller according to claim 4, characterized in that: The driving component (66) includes a roller (661) rotatably mounted on the outer surface of the support frame (62). One side of the roller (661) is coaxially and fixedly connected to a first gear (662). One side of the first gear (662) is meshed with a second speed-changing gear (663) with a diameter smaller than it. One side of the second speed-changing gear (663) is coaxially connected to another second speed-changing gear (663). One side of the said another second speed-changing gear (663) is meshed with a third speed-changing gear (664) with a diameter smaller than it. The third speed-changing gear (664) is coaxially connected to the cleaning roller (64). The upper surface of the roller (661) is pressed against the lower surface of the lower convex edge (54) of the lower convex part in the S-shaped slow-flow cavity (50).

6. The submersible pump with a low-wear impeller according to claim 4, characterized in that: An annular chute B (53) is formed on the inner wall of the S-shaped slow-flow cavity (50) and the side horizontally corresponding to the support frame (62). A sand cleaning hole (55) communicating with the outer surface of the pump housing (10) is formed on the inner wall of the chute B (53). A common slip ring (61) is connected to the outside of a plurality of the support frames (62). A through alignment hole (611) communicating with the inside of the whistle-shaped yarn separating net (65) is formed on the side surface of the slip ring (61). The slip ring (61) is hermetically slidably arranged inside the chute B (53). The alignment hole (611) is movably communicated with the sand cleaning hole (55).

7. The submersible pump with a low-wear impeller according to claim 6, characterized in that: The number of the sand cleaning holes (55) and the number of the alignment holes (611) are relatively prime numbers, and the number of the sand cleaning holes (55) is less than the number of the alignment holes (611).

8. A submersible pump with a low-wear impeller according to claim 7, characterized in that: The whistle-shaped yarn separating net (65) and the filter yarn net (52) adopt rigid filter meshes.

9. A submersible pump with a low-wear impeller according to any one of claims 1-8, characterized in that: The pump housing (10) includes an upper housing (11) on the upper side and a lower housing (12) on the lower side. The connection position of the upper housing (11) and the lower housing (12) is arranged inside the S-shaped slow-flow cavity (50). The upper housing (11) and the lower housing (12) are detachably connected by bolts and sealing rings.

Images