Submersible pump with low-abrasion impeller

Abstract

The invention relates to the technical field of submersible pumps, discloses a submersible pump with a low-abrasion impeller, and solves the problem that when a conventional submersible pump is used in a water environment containing solid particles, the particles can erosive and abrade the surfaces of backward blades to a greater extent in the water flow direction. The arrangement of the shunting ring and the concave cambered surface on one side, close to the blade type impeller, of the shunting ring facilitates the concentration of particulate matters with larger centrifugal force in flowing water to the area close to the cambered surface, so that the particulate matters can be conveniently and intensively collected into the S-shaped slow flow cavity through the narrow channel, and solid particles in the part are prevented from flowing to the next blade type impeller; therefore, the surface of the blade type impeller is damaged; the other side of the interior of the S-shaped slow flow cavity is provided with a water flowing hole communicated to the middle of the flow guide cavity, so that water in the S-shaped slow flow cavity can flow conveniently, water in the narrow channel can circulate at a high speed and has the loading capacity, and on the other hand, particulate matter can be collected on the surface of the filter gauze element, so that centralized treatment of a cleaning mechanism is facilitated.

Description

Technical Field

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

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

[0003] Centrifugal impellers are generally divided into channel impellers and blade impellers. Channel impellers allow solid particles and long-fiber materials to pass through, reducing clogging; the shape and number of blades of blade impellers help increase the pressure and flow of the pump, thereby transmitting over long distances, and are suitable for clean water or liquids that are only slightly contaminated; this case is aimed at blade impellers. There are smaller solid particles in the underwater environment. These particles will impact the surface of the blades under the drive of the high-speed rotation of the impeller, causing erosion and wear; this erosion and wear is reflected on multiple impellers, causing varying degrees of wear. The reason is that particles in the water will produce erosion when passing through different impellers, especially as the impellers increase in number, the water flow rate gradually increases, the kinetic energy carried by the solid particles is greater, and the erosion and wear on the blades will be more serious. 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 when a conventional submersible pump is used in a water environment containing solid particles, the particles will cause greater erosion and wear on the blade surface in the direction of water flow.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: 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 being connected between the submersible motor and the impeller mechanism adjacent thereto, the impeller mechanism comprising a pump casing, an impeller assembly being installed in the pump casing, the impeller assembly comprising a blade impeller for rotating and driving a water flow, a guide cavity communicating with a water outlet of the blade impeller being further provided in the pump casing, a diverter ring being provided at the periphery of the water outlet of the blade impeller of the impeller mechanism close to the filter screen, an S-shaped slow flow cavity being provided in the pump casing and above the diverter ring, a diverter plate being fixedly provided between the diverter cavity and the diverter ring, the diverter plate and the side surface of the diverter ring forming a narrow channel having a cross section smaller than that of the diverter cavity and leading to the S-shaped slow flow cavity, a concave arc surface with an upward curvature being provided on the side of the diverter ring close to the blade impeller, the concave arc surface being used to guide the water horizontally thrown out by the blade impeller to change its direction, and to guide it to the S-shaped slow flow cavity and the diverter cavity respectively;

[0006] A water hole is provided on the inner wall of the S-shaped slow flow chamber away from the diversion ring, and the water hole is connected to the middle of the diversion chamber. A filter mesh is provided in the S-shaped slow flow chamber near the water hole, and the filter mesh divides the S-shaped slow flow chamber into two chambers.

[0007] As a further description of the above technical solution: the lower side of the guide cavity is connected to a direct current cavity of a horizontally docked blade impeller, and a guide plate is provided in an annular manner in the direct current cavity parallel to the direction in which the water flow of the blade impeller is thrown out.

[0008] As a further description of the above technical solution: a slide groove A is opened in the pump casing, and the slide groove A is used for movably installing a diverter ring. The inner side of the diverter ring is provided with a plurality of protrusions in a concave arc ring shape, and the protrusions are parallel to the direction of the water flow thrown out by the blade impeller flowing into the guide cavity.

[0009] As a further description of the above technical solution: a plurality of cleaning mechanisms for cleaning the lower surface of the filter mesh are fixedly connected to the upper side of the diverter ring, the cleaning mechanism includes a support frame, the support frame is fixed to one side of the diverter ring through a fixed block, a cleaning roller is rotatably installed on the inner side of the support frame, and a whistle-shaped separation mesh 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 mesh, the entrance of the whistle-shaped separation mesh is aligned with the part where the cleaning roller and the filter mesh are attached, and a driving component for driving the cleaning roller to rotate is also provided 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 mounted on the outer surface of the supporting frame, one side of the roller is coaxially fixedly connected to a first gear, one side of the first gear is meshingly connected to a second speed gear with a smaller diameter than the first gear, one side of the second speed gear is coaxially connected to another second speed gear, one side of the other second speed gear is meshingly connected to a third speed gear with a smaller diameter than the second speed gear, the third speed gear is coaxially connected to a cleaning roller, and the upper surface of the roller is squeezed against the lower surface of the lower convex edge in the S-shaped slow flow chamber.

[0011] As a further description of the above technical solution: an annular slide groove B is provided on the inner wall of the S-shaped slow flow chamber and the side corresponding to the horizontal level of the support frame, and a sand cleaning hole connected to the outer surface of the pump casing is provided on the inner wall of the slide groove B. A common slip ring is connected to the outer side of the multiple support frames, and a penetrating alignment hole connected to the inner side of the whistle-shaped separation mesh is provided on the side surface of the slip ring. The slip ring seal slides on the inner side of the slide groove B, and the alignment hole is movably connected to the sand cleaning hole.

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

[0013] As a further description of the above technical solution: the whistle-type separation gauze net and the filter gauze net adopt a rigid filter net.

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

[0015] To sum up, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the setting of the diverter ring and the concave arc surface on one side of the diverter ring close to the blade impeller facilitates the particles with greater centrifugal force in the flowing water to be concentrated in the area close to the arc surface, so as to facilitate the concentration through the narrow channel to be collected in the S-shaped slow flow chamber, avoiding the solid particles of this part from flowing through the next blade impeller, thereby damaging the surface of the blade impeller; and the other side of the S-shaped slow flow chamber is provided with a water hole connected to the middle part of the guide chamber, which facilitates the flow of water in the S-shaped slow flow chamber and allows the water in the narrow channel to flow at high speed so that it has load-bearing capacity. On the other hand, it can also make the particles gather on the surface of the filter mesh so that the cleaning mechanism can centrally process them; the side surface of the pump casing is provided with a sand cleaning hole movably connected to the cleaning mechanism, which uses the high-pressure water stored in the S-shaped slow flow chamber 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. BRIEF 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 structural schematic diagram of the impeller mechanism close to the filter screen of the present invention;

[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 For the present invention Figure 3 Schematic diagram of A in the figure;

[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 shell and the diverter ring of the present invention;

[0023] Figure 8 For the present invention Figure 7 Schematic diagram of B in the figure;

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

[0025] Fig.10 It is a schematic diagram of the structure of the driving assembly, cleaning roller and whistle-type spacer mesh of the present invention;

[0026] Fig.11 It is a 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 casing; 11, upper casing; 12, lower casing; 13, chute A; 20, impeller assembly; 21, blade impeller; 30, guide chamber; 31, direct current chamber; 32, guide plate; 33, diverter plate; 40, diverter ring; 41, protrusion; 50, S-type slow flow chamber; 51, water 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-type separation screen; 66, driving assembly; 661, roller; 662, first gear; 663, second speed gear; 664, third speed gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0029] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0030] Combination Figure 1-Figure 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 impeller mechanism adjacent to the submersible motor. 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 blade impeller 21 for rotating and driving water flow. A guide cavity 30 connected to the water outlet of the blade impeller 21 is also provided in the pump housing 10. A diversion cavity 30 is provided near the impeller mechanism near the filter screen. Ring 40, an S-shaped slow-flow cavity 50 is opened in the pump housing 10 and above the diverter ring 40, a diverter plate 33 is fixedly arranged between the guide cavity 30 and the diverter ring 40, the diverter plate 33 and the side surface of the diverter ring 40 form a narrow channel with a cross-section smaller than the guide cavity 30 and leading to the S-shaped slow-flow cavity 50, and the diverter ring 40 is provided with a concave arc surface with an upward arc on the side close to the blade impeller 21, and the concave arc surface is used to guide the water horizontally thrown out by the blade impeller 21 to change the direction, and guide it to the S-shaped slow-flow cavity 50 and the guide cavity 30 respectively;

[0031] A water hole 51 is provided on the inner wall of the S-shaped slow flow chamber 50 away from the diverter ring 40. The water hole 51 is connected to the middle of the diversion chamber 30. A filter screen 52 is provided near the water hole 51 in the S-shaped slow flow chamber 50. The filter screen 52 divides the S-shaped slow flow chamber 50 into two chambers.

[0032] The above working principle and technical effect are as follows: the water centrifugally thrown out in the horizontal direction by the blade-type impeller 21 is redirected by the concave arc surface on one side of the diverter ring 40. The water close to the concave arc surface will pass into the S-shaped slow flow chamber 50 through the narrow channel between the diverter ring 40 and the diverter plate 33, while the water far away from the concave arc surface will pass into the guide chamber 30 and lead to the next connected impeller mechanism. Among them, when the flowing water thrown out by the blade-type impeller 21 contains solid particles, it will be moved in the direction of the concave arc surface in the horizontal direction under the action of a large centrifugal force, and finally changed its direction by the concave arc surface, and enter the S-shaped slow flow chamber 50 through the narrow channel along the direction of the arc surface with the water flow. After the particles enter the S-shaped slow flow chamber 50, the flow rate of the water is reduced, which greatly reduces the kinetic energy of the particles, thereby reducing their destructiveness.

[0033] Because a water hole 51 is provided on the other side of the S-shaped slow flow chamber 50 and connected to the middle part of the guide chamber 30, the water flowing at a high speed in the guide chamber 30 will cause the water hole 51 to generate suction, and the water in the S-shaped slow flow chamber 50 will be sucked out into the guide chamber 30. In this way, the water in the S-shaped slow flow chamber 50 flows from the narrow channel to the direction of the water hole 51. On the one hand, the water in the narrow channel can maintain a certain flow rate, so that the water with a certain flow rate has a load-bearing capacity, so that when particulate matter enters the narrow channel, the water flow has the ability to bring the particulate matter into the S-shaped slow flow chamber 50; on the other hand, it can promote the water flow in the S-shaped slow flow chamber 50 to move in the direction of the water hole 51, so that the filter mesh 52 can effectively concentrate the particulate matter on the surface; in addition, this whole process does not affect the pressurization and acceleration effect of the impeller mechanism on water.

[0034] Furthermore, the lower side of the guide cavity 30 is connected to a direct current cavity 31 that is horizontally connected to the blade-type impeller 21, and a guide plate 32 is provided in the direct current cavity 31 in an annular manner parallel to the direction in which the water flow of the blade-type impeller 21 is thrown out;

[0035] The purpose of setting the guide plate 32 is to effectively reduce the phenomenon of vortex generated by the water flow centrifugally thrown out by the blade-type impeller 21, so as to prevent the vortex from affecting the movement of solid particles to the arc surface of the diverter ring 40.

[0036] Furthermore, a slide groove A13 is provided in the pump housing 10, and the slide groove A13 is used for movably installing the diverter ring 40. The inner concave arc surface of the diverter ring 40 is provided with a plurality of protrusions 41, and the protrusions 41 are parallel to the direction of the water flow thrown out by the blade impeller 21 flowing in the guide cavity 30;

[0037] The water flow centrifugally ejected by the blade impeller 21 impacts the surface of the diverter ring 40 with the protrusion 41, which facilitates the diverter ring 40 to rotate in the slide groove A13, and then causes the upper side of the diverter ring 40 in the S-shaped slow flow chamber 50 to rotate in the S-shaped slow flow chamber 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 diverter ring 40, and the cleaning mechanism 60 includes a support frame 62, and the support frame 62 is fixed to one side of the diverter ring 40 through a fixing block 63, and a cleaning roller 64 and a whistle-shaped separation screen 65 arranged on the horizontal side of the cleaning roller 64 are rotatably installed inside the support frame 62, and the upper side of the cleaning roller 64 is attached to the lower surface of the filter screen 52, and the entrance of the whistle-shaped separation screen 65 is aligned with the part where the cleaning roller 64 and the filter screen 52 are attached, and a driving component 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 diverter ring 40 drives the support frame 62 to move in an annular manner on the lower surface of the filter mesh 52. During the movement, the rotating cleaning roller 64 is responsible for cleaning the solid particles adsorbed on the lower surface of the filter mesh 52 to the inner side of the whistle-shaped separation mesh 65 for centralized storage, so as to prevent the particles from adhering to the lower surface of the filter mesh 52 for a long time and affecting the circulation effect of the water in the S-shaped slow flow cavity 50;

[0040] The mesh surface of the upper side of the whistle-shaped separation mesh 65 adjacent to the filter mesh 52 is sealed, which is not shown in the figure. Therefore, when particulate matter enters the inner side of the whistle-shaped separation mesh 65, it is not affected by the adsorption effect of the mesh surface of the filter mesh 52.

[0041] Further, the driving assembly 66 includes a roller 661 rotatably mounted on the outer surface of the support frame 62, one side of the roller 661 is coaxially fixedly connected to a first gear 662, one side of the first gear 662 is meshedly connected to a second speed gear 663 with a smaller diameter than the first gear, one side of the second speed gear 663 is coaxially connected to another second speed gear 663, one side of the other second speed gear 663 is meshedly connected to a third speed gear 664 with a smaller diameter than the second speed gear, the third speed gear 664 is coaxially connected to the cleaning roller 64, and 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 chamber 50;

[0042] As the support frame 62 moves on the lower surface of the filter mesh 52, the driving component 66 squeezed on the lower surface of the lower convex edge 54 will also roll, thereby prompting the first gear 662, the second speed gear 663, and the third speed gear 664 to drive the cleaning roller 64 to rotate rapidly in the direction opposite to the moving direction, so as to achieve the purpose of cleaning the lower surface of the filter mesh 52. The whistle-shaped separation mesh 65 is arranged on one side of the rotation direction of the cleaning roller 64, and a closed cover is provided on the outside of the first gear 662, the second speed gear 663, and the third speed gear 664 to shield them.

[0043] In the previous embodiment: an annular slide groove B53 is provided on the inner wall of the S-shaped slow flow chamber 50 and the side corresponding to the horizontal level of the support frame 62, and a sand cleaning hole 55 connected to the outer surface of the pump housing 10 is provided on the inner wall of the slide groove B53, and a plurality of support frames 62 are connected to the outer side of a common slip ring 61, and a through alignment hole 611 connected to the inner side of the whistle-shaped spacer mesh 65 is provided on the side surface of the slip ring 61, and the slip ring 61 is sealed and slid on the inner side of the slide groove B53, and the alignment hole 611 is movably connected to the sand cleaning hole 55;

[0044] The above working principle and technical effect are: affected by the water pressure in the pump casing 10, the water pressure in the S-shaped slow flow chamber 50 will also be much higher than the water pressure of the external environment of the pump casing 10. Therefore, as the support frame 62 moves in an annular manner in the S-shaped slow flow chamber 50, the slip ring 61 is driven to move on the inside of the slide groove B53. When the alignment hole 611 and the sand cleaning hole 55 are connected for a short time, the high-pressure water in the S-shaped slow flow chamber 50 will quickly flow through the alignment hole 611 and the sand cleaning hole 55 to the outside of the pump casing 10. This process will bring the solid particles collected in the whistle-shaped separation mesh 65 to the outside of the pump casing 10, thereby achieving the purpose of automatically cleaning the solid particles in the whistle-shaped separation mesh 65.

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

[0046] This can avoid the situation where multiple sand cleaning holes 55 and multiple alignment holes 611 are connected at the same time, which will lead to a decrease in the flow rate of water pressure relief of a single connected sand cleaning hole 55 and alignment hole 611, resulting in a poor effect of discharging solid particles.

[0047] Furthermore, the whistle-shaped spacer mesh 65 and the filter mesh 52 use rigid filter meshes;

[0048] In response to the changes in water pressure in the S-shaped slow flow chamber 50, the whistle-shaped isolation mesh 65 adopts a rigid filter mesh, which is not easy to deform with the water pressure and is more likely to cause particles to detach from the surface of the mesh, thereby facilitating discharge; the filter mesh 52 adopts a rigid filter mesh, which makes it easier for the rotating cleaning roller 64 to better bear the force on the lower surface of the filter mesh 52, so as to better clean the particles attached 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 set in 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] The detachable connection between the upper shell 11 and the lower shell 12 facilitates the subsequent repair and maintenance of the S-shaped slow flow chamber 50 , the diverter ring 40 and the cleaning mechanism 60 .

[0051] Working principle: water centrifugally thrown out in the horizontal direction by the blade-type impeller 21 passes through the concave arc surface on one side of the diverter ring 40. The water close to the concave arc surface passes into the S-shaped slow flow chamber 50 through the narrow channel between the diverter ring 40 and the diverter plate 33, while the water far away from the concave arc surface passes into the guide chamber 30 and leads to the next connected impeller mechanism. When the flowing water thrown out by the blade-type impeller 21 contains solid particles, it is horizontally affected by the large centrifugal force and moves toward the direction of the concave arc surface. Then, it passes through the narrow channel along the direction of the arc surface with the water flow into the S-shaped slow flow chamber 50. Then, the water outlet 51 is provided on the other side of the S-shaped slow flow chamber 50 and connected to the middle part of the guide chamber 30, so that the water flow in the S-shaped slow flow chamber 50 moves toward the direction of the water outlet 51, so that the filter mesh 52 can effectively concentrate and adsorb the particles on the surface.

[0052] Next, the rotating diverter ring 40 drives the support frame 62 to move in an annular manner on the lower surface of the filter screen 52. During the movement, the driving component 66 squeezed on the lower surface of the lower convex edge 54 rolls, and the first gear 662, the second speed gear 663, and the third speed gear 664 are linked to drive the cleaning roller 64 to rotate rapidly. The rotating cleaning roller 64 is responsible for cleaning the solid particles adsorbed on the lower surface of the filter screen 52 to the inner side of the whistle-shaped separation screen 65 for centralized storage, and then the support frame 62 is used to clean the solid particles adsorbed on the lower surface of the filter screen 52 to the inner side of the whistle-shaped separation screen 65 for centralized storage. The frame 62 moves in an annular manner in the S-shaped slow flow chamber 50, driving the slip ring 61 to move inside the slide groove B53. When the alignment hole 611 is connected to the sand cleaning hole 55 for a short time, the high-pressure water in the S-shaped slow flow chamber 50 will quickly flow through the alignment hole 611 and the sand cleaning hole 55 to the outside of the pump casing 10. This process will bring the solid particles collected in the whistle-shaped separation mesh 65 out to the outside of the pump casing 10, thereby achieving the purpose of automatically cleaning the solid particles in the whistle-shaped separation mesh 65.

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

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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, wherein a filter screen is connected between the submersible motor and the impeller mechanisms adjacent thereto, wherein the impeller mechanism comprises a pump casing (10), wherein an impeller assembly (20) is installed in the pump casing (10), wherein the impeller assembly (20) comprises a blade impeller (21) for rotating and driving water flow, and wherein a flow guide cavity (30) is provided in the pump casing (10) and is communicated with a water outlet of the blade impeller (21). Features: The impeller mechanism close to the filter screen has a diverter ring (40) disposed on the periphery of the water outlet of the blade-type impeller (21); an S-shaped slow-flow chamber (50) is provided in the pump housing (10) and above the diverter ring (40); a diverter plate (33) is fixedly disposed between the guide chamber (30) and the diverter ring (40); the diverter plate (33) and the side surface of the diverter ring (40) form a narrow channel with a cross-section smaller than that of the guide chamber (30) and leading to the S-shaped slow-flow chamber (50); a concave arc surface with an upward arc is disposed on the side of the diverter ring (40) close to the blade-type impeller (21); the concave arc surface is used to guide the water horizontally thrown out by the blade-type impeller (21) to change its direction and guide it to the S-shaped slow-flow chamber (50) and the guide chamber (30) respectively; A water hole (51) is provided on the inner wall of the S-shaped slow flow chamber (50) at a side away from the diverter ring (40), and the water hole (51) is connected to the middle of the flow guide chamber (30). A filter mesh (52) is provided in the S-shaped slow flow chamber (50) at a side close to the water hole (51), and the filter mesh (52) divides the S-shaped slow flow chamber (50) into two chambers.

2. A submersible pump with a low-wear impeller according to claim 1, Features: The lower side of the flow guide cavity (30) is connected to a direct current cavity (31) of a horizontally docked blade-type impeller (21), and a flow guide plate (32) is provided in an annular shape inside the direct current cavity (31) and is parallel to the direction in which the water flow of the blade-type impeller (21) is thrown out.

3. A submersible pump with a low-wear impeller according to claim 1, Features: A slide groove A (13) is provided in the pump housing (10), and the slide groove A (13) is used for movably installing a diverter ring (40). A plurality of protrusions (41) are provided in a concave arc surface ring on the inner side of the diverter ring (40), and the protrusions (41) are parallel to the direction in which the water flow thrown out by the blade impeller (21) flows into the guide cavity (30).

4. A submersible pump with a low-wear impeller according to claim 3, Features: A plurality of cleaning mechanisms (60) for cleaning the lower surface of the filter mesh (52) are fixedly connected to the upper side of the diverter ring (40). The cleaning mechanisms (60) include a support frame (62). The support frame (62) is fixed to one side of the diverter ring (40) via a fixing block (63). A cleaning roller (64) is rotatably mounted on the inner side of the support frame (62), and a whistle-shaped separation mesh (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 mesh (52). The entrance of the whistle-shaped separation mesh (65) is aligned with the portion where the cleaning roller (64) and the filter mesh (52) are attached. A driving component (66) for driving the cleaning roller (64) to rotate is also arranged on the outer side of the support frame (62).

5. A submersible pump with a low-wear impeller according to claim 6, Features: The driving assembly (66) comprises a roller (661) rotatably mounted on the outer surface of the supporting frame (62); one side of the roller (661) is coaxially fixedly connected to a first gear (662); one side of the first gear (662) is meshingly connected to a second speed gear (663) having a smaller diameter than the first gear; one side of the second speed gear (663) is coaxially connected to another second speed gear (663); one side of the other second speed gear (663) is meshingly connected to a third speed gear (664) having a smaller diameter than the second speed gear; the third speed 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) in the S-shaped slow flow chamber (50).

6. A submersible pump with a low-wear impeller according to claim 4, Features: An annular slide groove B (53) is provided on one side of the inner wall of the S-shaped slow flow chamber (50) and the horizontal corresponding side of the support frame (62); a sand cleaning hole (55) connected to the outer surface of the pump housing (10) is provided on the inner wall of the slide groove B (53); a plurality of support frames (62) are connected to the outer sides of a common slip ring (61); a side surface of the slip ring (61) is provided with a penetrating alignment hole (611) connected to the inner side of the whistle-shaped spacer mesh (65); the slip ring (61) is sealingly slidable on the inner side of the slide groove B (53); and the alignment hole (611) is movably connected to the sand cleaning hole (55).

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

8. A submersible pump with a low-wear impeller according to claim 7, Features: The whistle-shaped separation gauze net (65) and the filter gauze net (52) adopt rigid filter nets.

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

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