Slurry pump
By adopting an adjustable rotor structure and inclined sealing surface design in the slurry pump, the problems of bearing damage and seal wear have been solved, resulting in cost reduction and improved stability.
Patent Information
- Application Number
- CN202520812476.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-25
AI Technical Summary
When existing slurry pumps are in operation, the bearings are prone to damage, and the seals between the impeller and the pump body wear severely, leading to increased leakage and affecting equipment stability and cost.
Design a slurry pump that adopts an adjustable rotor structure and a gap seal with the sealing surface inclined to a conical surface. Wear compensation is achieved by adjusting the axial position of the rotor structure, and the impeller is designed as a detachable structure to simplify the assembly process.
It effectively reduces the operating cost of slurry pumps and extends their service life, while also improving the feasibility of assembly and the stability of the equipment.
Smart Images
Figure CN223952878U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pumps, in particular to a slurry pump. BACKGROUND
[0002] The slurry pump is a special industrial pump for conveying liquid-solid mixed medium (i.e. "slurry") containing high-concentration solid particles (such as sand, coal ash, silt, etc.). Its design focuses on wear resistance, corrosion resistance and impact resistance, and is widely used in mining, metallurgy, power, dredging, chemical industry and other fields. The slurry pump is an indispensable key equipment in heavy industry, and its performance directly affects the production efficiency and cost control. Correct selection, reasonable operation and regular maintenance are the core of ensuring its long-term stable operation.
[0003] The slurry pump usually adopts a centrifugal pump structure. At present, the axial force generated by the impeller of the ordinary slurry pump is borne by the bearing structure during operation, which causes the bearing to be easily damaged. On the other hand, the medium conveyed by the slurry pump is liquid-solid mixed medium containing high-concentration solid particles, which will aggravate the wear of the gap seal between the impeller and the pump body, causing the gap to increase and aggravate the leakage. CONTENT OF THE INVENTION
[0004] The technical problem to be solved by the present application is to provide a slurry pump to solve the above problems in the prior art.
[0005] A slurry pump comprises:
[0006] A pump body having an internal space, an inlet and an outlet;
[0007] A rotor structure comprising a pump shaft, an impeller and an impeller split body; the pump shaft is arranged in the internal space of the pump body, and the impeller and the impeller split body are arranged on the pump shaft; the rotor structure is assembled on the pump body and can adjust the assembly position in the axial direction of the pump shaft;
[0008] A bearing structure is assembled between the rotor structure and the pump body to form a rotating support for the rotor structure;
[0009] The impeller is a centrifugal pump impeller structure comprising a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate; the impeller split body is sealingly combined with the rear cover plate, and the impeller split body and the rear cover plate can be split in the axial direction;
[0010] A first gap seal is formed between the pump body and the impeller split body, and the first gap seal is formed by the cooperation of a first ring-shaped sealing surface on the pump body and a second ring-shaped sealing surface on the impeller split body;
[0011] A second gap seal is formed between the pump body and the front cover plate, and the second gap seal is formed by cooperation of a third annular sealing surface on the pump body and a fourth annular sealing surface on the front cover plate;
[0012] A mechanical seal structure is arranged between the rotor structure and the pump body around the rotor structure, and the mechanical seal structure is located on the side of the rear cover plate of the impeller;
[0013] The first annular sealing surface, the second annular sealing surface, the third annular sealing surface and the fourth annular sealing surface are all inclined to the same side along the axial direction of the rotor structure to form tapered surfaces.
[0014] Optionally, an annular cavity is formed between the impeller part and the rear cover plate around the rotor structure;
[0015] A sealing ring is arranged between the impeller part and the rear cover plate at the outer periphery of the annular cavity.
[0016] Optionally, a high-pressure cavity is formed in the pump body between the mechanical seal structure and the first gap seal;
[0017] A first pressure relief hole is arranged on the impeller part and a second pressure relief hole is arranged on the rear cover plate in the inner ring of the sealing part between the impeller part and the rear cover plate; the first pressure relief hole and the second pressure relief hole are in communication with each other, the first pressure relief hole is connected to the high-pressure cavity, and the second pressure relief hole is connected to the water inlet area inside the impeller.
[0018] Optionally, for the first gap seal, the second annular sealing surface is located in the inner ring of the first annular sealing surface;
[0019] For the second gap seal, the fourth annular sealing surface is located in the inner ring of the third annular sealing surface;
[0020] The second annular sealing surface and the fourth annular sealing surface are directed to the water inlet side of the impeller.
[0021] Optionally, the bearing structure includes a bearing seat and a bearing; the bearing seat is assembled on the pump body and can be adjusted in the axial direction of the pump shaft; the outer ring of the bearing is assembled on the bearing seat, and the inner ring of the bearing is assembled on the rotor structure;
[0022] The slurry pump further comprises an adjusting component for adjusting the axial position of the bearing seat, so as to adjust the axial installation position of the rotor structure.
[0023] Optionally, the adjusting component is a bolt arranged between the bearing seat and the pump body.
[0024] Optionally, the adjusting component comprises a plurality of first adjusting bolts and a plurality of second adjusting bolts, the first adjusting bolts and the second adjusting bolts are arranged on the bearing seat;
[0025] The plurality of first adjusting bolts pass through the openings on the bearing seat and are screwed with the pump body for tensioning the pump body and the bearing seat; the plurality of second adjusting bolts are screwed with the bearing seat and abut against the pump body.
[0026] Optionally, the bearing seat comprises a bearing support and an end cover; the bearing is arranged between the bearing support and the end cover.
[0027] Optionally, two bearing structures are arranged between the rotor structure and the pump body, and the adjusting component is arranged on only one of the bearing structures.
[0028] Optionally, in the high-pressure area of the impeller outlet, the effective axial force area difference between the front cover plate and the rear cover plate is less than 10%.
[0029] In the present application, on the one hand, since the first ring-shaped sealing surface, the second ring-shaped sealing surface, the third ring-shaped sealing surface, and the fourth ring-shaped sealing surface are all inclined to form a conical surface towards the same side along the axial direction of the rotor structure, when the gap of the first gap seal and the second gap seal increases due to wear during the operation of the slurry pump, the maintenance personnel can adjust the axial installation position of the rotor structure to compensate for the wear of the gap of the first gap seal and the second gap seal, thereby avoiding the need to replace the related components or even the entire machine, effectively reducing the use cost and service life of the slurry pump. On the other hand, during assembly, the first ring-shaped sealing surface on the pump body and the second ring-shaped sealing surface on the impeller split body need to be matched together to form the first gap seal, at the same time, the third ring-shaped sealing surface on the pump body and the fourth ring-shaped sealing surface on the front cover plate need to be matched together to form the second gap seal, and the first ring-shaped sealing surface, the second ring-shaped sealing surface, the third ring-shaped sealing surface, and the fourth ring-shaped sealing surface are all inclined to form a conical surface towards the same side along the axial direction of the rotor structure. Therefore, the present application splits the centrifugal pump impeller structure into two parts, the impeller split body and the impeller, the impeller split body is sealed and combined with the rear cover plate, and the impeller split body and the rear cover plate can be split along the axial direction. Therefore, the assembly can be carried out separately, which has good assembly performance. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is a structural schematic diagram of a slurry pump in the embodiments of the present application.
[0031] Figure 2 is Figure 1 one of the partial enlarged views of
[0032] Figure 3is Figure 1 Figure 2 is a partial enlarged view of Figure 1.
[0033] Reference numerals: pump body 10, inner space 11, water inlet 12, water outlet 13, high-pressure cavity 14, rotor structure 20, pump shaft 21, impeller 22, front cover plate 221, rear cover plate 222, second pressure relief hole 2221, blade 223, impeller split body 23, first pressure relief hole 231, annular cavity 24, sealing ring 25, bearing structure 30, bearing seat 31, bearing support 311, end cover 312, bearing 32, first gap seal 40, first annular sealing surface 41, second annular sealing surface 42, second gap seal 50, third annular sealing surface 51, fourth annular sealing surface 52, mechanical seal structure 60, first adjusting bolt 71, second adjusting bolt 72. DETAILED DESCRIPTION
[0034] The following are specific embodiments of the present application and further describe the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope of protection of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted.
[0035] It should be noted that the embodiments and features in the present application can be combined with each other without conflict.
[0036] The present application provides a slurry pump, which is a special industrial pump specially used for conveying liquid-solid mixed medium (i.e. "slurry") containing high-concentration solid particles (such as sand, coal ash, silt, etc.). The medium conveyed by the slurry pump is liquid-solid mixed medium containing high-concentration solid particles, which will exacerbate the wear of the gap seal between the impeller and the pump body, causing the gap to increase and exacerbate leakage. Therefore, the structure of the slurry pump is optimized, the wear of the sealing gap between the impeller and the pump body can be compensated by adjusting the axial installation position of the rotor structure, and good assembly is achieved.
[0037] Reference Figures 1-3, the slurry pump comprises a pump body 10, a rotor structure 20, a bearing structure 30, and a mechanical seal structure 60. The pump body 10 has an internal space 11, an inlet 12, and an outlet 13. The rotor structure 20 comprises a pump shaft 21, an impeller 22, and an impeller part 23. The pump shaft 21 is arranged in the internal space 11 of the pump body 10, and the impeller 22 and the impeller part 23 are arranged on the pump shaft 21. The rotor structure 20 is assembled on the pump body 10 and can be adjusted in the axial direction of the pump shaft 21. The bearing structure 30 is assembled between the rotor structure 20 and the pump body 10 to provide rotational support for the rotor structure 20.
[0038] In the embodiment of the present application, the slurry pump comprises a pump body 10 and a rotor structure 20. The pump body 10 has an internal space 11, an inlet 12, and an outlet 13. The rotor structure 20 comprises a pump shaft 21, an impeller 22, and an impeller part 23. The pump shaft 21 is arranged in the internal space of the pump body 10, and the impeller 22 is arranged on the pump shaft 21. The rotor structure 20 is assembled on the pump body 10 and can be adjusted in the axial direction of the pump shaft 10.
[0039] The impeller 22 is a centrifugal pump impeller structure comprising a front cover plate 221, a rear cover plate 222, and blades 223 arranged between the front cover plate 221 and the rear cover plate 222. The impeller part 23 is sealingly combined with the rear cover plate 222, and the impeller part 23 and the rear cover plate 222 can be separated in the axial direction. A mechanical seal structure 60 is arranged between the rotor structure 20 and the pump body 10 around the rotor structure 20, and the mechanical seal structure 60 is located on the side of the rear cover plate 222 of the impeller 22.
[0040] A first gap seal 40 is formed between the pump body 10 and the impeller part 23, and the first gap seal 40 is formed by a first ring-shaped sealing surface 41 on the pump body 10 and a second ring-shaped sealing surface 42 on the impeller part 23. A second gap seal 50 is formed between the pump body 10 and the front cover plate 221, and the second gap seal 50 is formed by a third ring-shaped sealing surface 51 on the pump body 10 and a fourth ring-shaped sealing surface 52 on the front cover plate 221. The first ring-shaped sealing surface 41, the second ring-shaped sealing surface 42, the third ring-shaped sealing surface 51, and the fourth ring-shaped sealing surface 52 are all inclined to form a conical surface on the same side of the axial direction of the rotor structure 20.
[0041] It should be understood that the rotor structure 20 is a rotating part in the pump body 10, which comprises the pump shaft 21, the impeller 22, the impeller part 23, and other components and structures that rotate with the pump shaft 10. A first gap seal 40 is formed between the pump body 10 and the impeller part 23, and a second gap seal 50 is formed between the pump body 10 and the front cover plate 221 of the impeller.
[0042] In the embodiment of the present application, on one hand, since the first annular sealing surface 41, the second annular sealing surface 42, the third annular sealing surface 51 and the fourth annular sealing surface 52 are all inclined to form a taper surface along the same side of the axial direction of the rotor structure 20, when the gap of the first gap seal 40 and the second gap seal 50 is increased due to wear during the operation of the slurry pump, the maintenance personnel can adjust the axial installation position of the rotor structure 20 to compensate the gap of the first gap seal 40 and the second gap seal 50 due to wear, so that the related components (for example, the impeller) or even the whole machine do not need to be replaced, thereby effectively reducing the use cost and service life of the slurry pump. On the other hand, during assembly, the first annular sealing surface 41 on the pump body 10 and the second annular sealing surface 42 on the impeller split body 23 need to be matched together to form the first gap seal 40, at the same time, the third annular sealing surface 51 on the pump body 10 and the fourth annular sealing surface 52 on the front cover plate 221 need to be matched together to form the second gap seal 50, and the first annular sealing surface 41, the second annular sealing surface 42, the third annular sealing surface 51 and the fourth annular sealing surface 52 are all inclined to form a taper surface along the same side of the axial direction of the rotor structure 20, therefore, the centrifugal pump impeller structure is split into two parts of the impeller split body 23 and the impeller 22, the impeller split body 23 is sealed and combined with the rear cover plate 222 and the impeller split body 23 and the rear cover plate 222 can be split along the axial direction, therefore, the assembly can be carried out separately during assembly, which has good assemblability. It should be noted that, based on the above structure provided in the present application, if the impeller split body 23 and the impeller 22 are designed as an integral impeller structure, the assembly difficulty will be greatly increased, and even the assembly cannot be completed.
[0043] In the embodiment of the present application, the difference between the effective axial stress area of the front cover plate 221 and the effective axial stress area of the rear cover plate 222 in the high-pressure area of the impeller outlet is less than 10%. Figure 2 The structure shown in the figure shows the stress surface P1 of the front cover plate 221 and the stress surface P2 of the rear cover plate 222 in the high-pressure area of the impeller 22 outlet. It should be noted that in the high-pressure area of the impeller outlet, the effective axial stress area of the front cover plate 221 is the area of the normal projection of the stress surface P1 along the axial direction of the pump shaft; the effective axial stress area of the rear cover plate 222 is the area of the normal projection of the stress surface P2 along the axial direction of the pump shaft, and the directions of the stress surface P1 and the stress surface P2 are located on both sides of the impeller 22. In this way, the axial stress of the stress surface P1 of the front cover plate 221 and the stress surface P2 of the rear cover plate 222 can be at least partially offset, so that the impeller 22 is at least partially self-balanced in the axial direction, the axial force applied by the impeller 22 to the pump shaft is reduced, and the axial imbalance of the rotor structure 20 is reduced.
[0044] In an embodiment of the present application, a ring cavity 24 is formed between the impeller part 23 and the back cover plate 222 around the rotor structure 20. A sealing ring 25 is arranged between the outer periphery of the ring cavity 24 and the impeller part 23 and the back cover plate 222, so that the impeller part 23 and the back cover plate 222 are detachably sealed and combined together. In this structure, the arrangement of the ring cavity 24 between the impeller part 23 and the back cover plate 222 can reduce the material volume to reduce the structure weight.
[0045] In an embodiment of the present application, a high pressure cavity 14 is formed in the pump body 10 between the mechanical seal structure 60 and the first gap seal 40. In the inner periphery of the sealing part between the impeller part 23 and the back cover plate 222, a first pressure relief hole 231 is arranged on the impeller part 23, and a second pressure relief hole 2221 is arranged on the back cover plate 222; the first pressure relief hole 231 and the second pressure relief hole 2221 are in communication with each other, and the first pressure relief hole 231 is communicated to the high pressure cavity 14, and the second pressure relief hole 2221 is communicated to the water inlet area inside the impeller 22. Therefore, the first pressure relief hole 231 and the second pressure relief hole 2221 are used to communicate the high pressure cavity 14 between the mechanical seal structure 60 and the first gap seal 40 to the water inlet area inside the impeller 22, so as to relieve the pressure of the high pressure cavity 14 between the mechanical seal structure 60 and the first gap seal 40, and prevent the mechanical seal structure 60 from being damaged by the impact of the high fluid pressure.
[0046] Reference Figure 1 and Figure 2 In an embodiment of the present application, for the first gap seal 40, the second ring sealing surface 42 is located in the inner periphery of the first ring sealing surface 41; for the second gap seal 50, the fourth ring sealing surface 52 is located in the inner periphery of the third ring sealing surface 51; and the second ring sealing surface 42 and the fourth ring sealing surface 52 are towards the water inlet side of the impeller 22.
[0047] Reference Figure 1 and Figure 3 In an embodiment of the present application, the bearing structure 30 comprises a bearing seat 31 and a bearing 32; the bearing seat 31 is assembled on the pump body 10 and can be adjusted in the axial direction of the pump shaft 21; the outer ring of the bearing is assembled on the bearing seat 31, and the inner ring of the bearing is assembled on the rotor structure 20. The slurry pump further comprises an adjusting component for adjusting the axial position of the bearing seat 31, so as to adjust the axial installation position of the rotor structure 20. In this structure, the bearing seat 31 can be adjusted in the axial direction of the pump shaft 21 by means of the adjusting component, and at the same time, the rotor structure 20 is moved as a whole in the axial direction of the pump shaft 21.
[0048] Further, the adjusting component is a bolt arranged between the bearing seat 31 and the pump body 10. In a specific embodiment, the adjusting component comprises: a plurality of first adjusting bolts 71 and a plurality of second adjusting bolts 72, the first adjusting bolts 71 and the second adjusting bolts 72 are arranged on the bearing seat 31; the first adjusting bolts 71 pass through the holes on the bearing seat 31 and are screwed with the pump body 10 for tensioning the pump body 10 and the bearing seat 31; the second adjusting bolts 72 are screwed with the bearing seat 31 and abut against the pump body 10. In this structure, the first adjusting bolts 71 are used for tensioning the pump body 10 and the bearing seat 31, and the second adjusting bolts 72 are used for abutting against the pump body 10 to fix the bearing seat 31 on the pump body 10. In addition, the first adjusting bolts 71 and the second adjusting bolts 72 can also adjust the bearing seat 31. Further, the bearing seat 31 comprises: a bearing support 311 and an end cover 312; the bearing is arranged between the bearing support 311 and the end cover 312.
[0049] Reference Figure 1 In an embodiment of the present application, two bearing structures 30 are arranged between the rotor structure 20 and the pump body 10, and the adjusting component is arranged on only one of the bearing structures 30.
[0050] In summary, on the one hand, since the first annular sealing surface, the second annular sealing surface, the third annular sealing surface and the fourth annular sealing surface are all inclined to form a tapered surface along the axial direction of the rotor structure to the same side, when the gap of the first gap seal and the second gap seal increases due to wear during the operation of the slurry pump, the maintenance personnel can adjust the axial installation position of the rotor structure to compensate for the wear of the gap of the first gap seal and the second gap seal, so that the related components, or even the entire machine, do not need to be replaced, thereby effectively reducing the use cost and service life of the slurry pump. On the other hand, during assembly, the first annular sealing surface on the pump body and the second annular sealing surface on the impeller split body need to be matched together to form the first gap seal, at the same time, the third annular sealing surface on the pump body and the fourth annular sealing surface on the front cover plate need to be matched together to form the second gap seal, and the first annular sealing surface, the second annular sealing surface, the third annular sealing surface and the fourth annular sealing surface are all inclined to form a tapered surface along the axial direction of the rotor structure to the same side. Therefore, the centrifugal pump impeller structure is split into two parts, the impeller split body and the impeller, the impeller split body is sealingly combined with the rear cover plate and the impeller split body and the rear cover plate can be split along the axial direction, so that the assembly can be carried out separately, which has good assembly performance.
[0051] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0052] Moreover, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of indicated technical features. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited. It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.
[0053] The specific embodiments described herein merely exemplify the technical solutions of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the scope defined by the claims of the present application.
Claims
1. A slurry pump characterized by, The pump comprises: a pump body having an internal space, an inlet and an outlet; a rotor structure comprising a pump shaft, an impeller and an impeller subassembly; the pump shaft is arranged in the internal space of the pump body, and the impeller and the impeller subassembly are arranged on the pump shaft; the rotor structure is assembled on the pump body and can be adjusted in axial direction of the pump shaft; a bearing structure is arranged between the rotor structure and the pump body to provide rotational support for the rotor structure; the impeller is a centrifugal pump impeller structure comprising a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate; the impeller subassembly is in sealing connection with the rear cover plate, and the impeller subassembly and the rear cover plate can be separated in axial direction; a first gap seal is formed between the pump body and the impeller subassembly, and the first gap seal is formed by cooperation of a first annular sealing surface on the pump body and a second annular sealing surface on the impeller subassembly; a second gap seal is formed between the pump body and the front cover plate, and the second gap seal is formed by cooperation of a third annular sealing surface on the pump body and a fourth annular sealing surface on the front cover plate; a mechanical seal structure is arranged around the rotor structure between the rotor structure and the pump body, and the mechanical seal structure is located on the side of the rear cover plate of the impeller; the first annular sealing surface, the second annular sealing surface, the third annular sealing surface and the fourth annular sealing surface are all inclined to form tapered surfaces on the same side in axial direction of the rotor structure.
2. The slurry pump of claim 1, wherein, a ring-shaped cavity is formed between the impeller subassembly and the rear cover plate around the rotor structure; a sealing ring is arranged between the impeller subassembly and the rear cover plate on the outer periphery of the ring-shaped cavity.
3. The slurry pump of claim 1, wherein, a high-pressure cavity is formed in the pump body between the mechanical seal structure and the first gap seal; a first pressure relief hole is arranged on the impeller subassembly in the inner ring of the sealing part between the impeller subassembly and the rear cover plate, and a second pressure relief hole is arranged on the rear cover plate; the first pressure relief hole and the second pressure relief hole are in communication with each other, the first pressure relief hole is connected to the high-pressure cavity, and the second pressure relief hole is connected to the water inlet area inside the impeller.
4. The slurry pump according to claim 1, wherein for the first gap seal, the second annular sealing surface is located in the inner ring of the first annular sealing surface; for the second gap seal, the fourth annular sealing surface is located in the inner ring of the third annular sealing surface; wherein the second annular sealing surface and the fourth annular sealing surface are directed to the water inlet side of the impeller.
5. The slurry pump of claim 1, wherein, The bearing structure comprises a bearing seat and a bearing; the bearing seat is assembled on the pump body and can be adjusted in axial direction of the pump shaft; the outer ring of the bearing is assembled on the bearing seat, and the inner ring of the bearing is assembled on the rotor structure; The slurry pump further comprises an adjusting component for adjusting the axial position of the bearing seat, thereby adjusting the axial mounting position of the rotor structure.
6. The slurry pump of claim 5, wherein, The adjusting component is a bolt arranged between the bearing seat and the pump body.
7. The slurry pump of claim 6, wherein, The adjusting component comprises a plurality of first adjusting bolts and a plurality of second adjusting bolts, which are arranged on the bearing seat; The plurality of first adjusting bolts pass through the openings on the bearing seat and are screwed with the pump body for tensioning the pump body and the bearing seat; the plurality of second adjusting bolts are screwed with the bearing seat and abut against the pump body.
8. The slurry pump of claim 5, wherein, The bearing seat comprises a bearing support and an end cover; the bearing is arranged between the bearing support and the end cover.
9. The slurry pump of claim 5, wherein, Two bearing structures are arranged between the rotor structure and the pump body, and adjusting components are arranged on only one of the bearing structures.
10. The slurry pump of claim 1, wherein, In the high-pressure area of the impeller outlet, the difference between the effective axial force areas of the front cover plate and the rear cover plate is less than 10%.