Composite ring cover for pump and centrifugal pump

Abstract

This utility model discloses a composite ring sleeve for pumps and a centrifugal pump. The composite ring sleeve includes: a ring-shaped body with opposing inlet and outlet ends along the axial direction, and guide structures provided at the transition positions between the inlet and outlet ends and the inner surface of the body; the body includes: a substrate and a wear-resistant component, the substrate and the wear-resistant component being integrally formed or fitted and fixed. When the substrate and the wear-resistant component are fitted and fixed, the substrate has opposing first inner wall surfaces and first outer wall surfaces along the radial direction; the wear-resistant component is located at the first inner wall surface of the substrate, and the wear-resistant component has opposing second inner wall surfaces and second outer wall surfaces along the radial direction, the second outer wall surface being adapted to the shape of the first inner wall surface. This application improves the wear resistance and erosion resistance of the ring sleeve through structural optimization, extends its service life, and ensures assembly stability and operational reliability.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a composite ring sleeve for pumps and a centrifugal pump. Background Technology

[0002] When centrifugal pumps operate in conditions containing high concentrations of hard abrasive particles (such as water injection, synthetic crude oil processing, and asphalt / water emulsion systems), wear and corrosion are the core issues limiting the service life of components, significantly increasing equipment maintenance, parts replacement, and downtime costs. Internal pump wear mainly includes adhesive wear, pitting, abrasive wear, and erosive wear. Among these, abrasive wear and erosive wear are particularly severe under high-abrasion conditions, with the material loss rate approximately proportional to the cube of the particle velocity. The wear of ring-type components in centrifugal pumps, such as throttling bushings, nozzle rings, and bushings, is the most severe.

[0003] Related technologies have also provided some measures to improve the service life of ring-type components such as throttling bushings, wear rings, and bushings in centrifugal pumps. However, current ring-type components such as throttling bushings, wear rings, and bushings in centrifugal pumps still cannot simultaneously meet the requirements of wear resistance, impact resistance, thermal matching, and stable operation under highly abrasive conditions.

[0004] Therefore, it is necessary to propose a composite ring sleeve for pumps and a centrifugal pump to solve at least one of the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a composite ring sleeve for pumps and a centrifugal pump. Through structural optimization, the wear resistance and erosion resistance of the ring sleeve are improved, extending its service life, while ensuring assembly stability and operational reliability.

[0007] The specific technical solution of this utility model embodiment is as follows:

[0008] A composite ring sleeve for pumps and a centrifugal pump are disclosed. The composite ring sleeve and centrifugal pump include: a ring-shaped body having opposing inlet and outlet ends along the axial direction, with guide structures provided at the transition positions between the inlet and outlet ends and the inner surface of the body; the body includes: a substrate and a wear-resistant component, the substrate and the wear-resistant component being integrally formed or fitted and fixed; when the substrate and the wear-resistant component are fitted and fixed, the substrate has opposing first inner wall surfaces and first outer wall surfaces along the radial direction; the wear-resistant component is located at the first inner wall surface of the substrate, and the wear-resistant component has opposing second inner wall surfaces and second outer wall surfaces along the radial direction, the shape of the second outer wall surface being adapted to the first inner wall surface.

[0009] Furthermore, the guide structure includes rounded corners or chamfers.

[0010] Furthermore, when the axial length of the body is less than 1 inch, the size of the guide structure is not less than 1 / 32 inch.

[0011] Furthermore, when the axial length of the body is greater than 1 inch, the size of the guide structure is at least 1 / 16 inch.

[0012] Furthermore, the base includes a detachably connected first mating portion and a second mating portion, as well as fasteners for connecting the first mating portion and the second mating portion.

[0013] Furthermore, the first docking portion has a first docking surface facing the second docking portion, the second docking portion has a second docking surface facing the first docking portion, the substrate has a first limiting groove on the first docking surface, the second docking surface has a second limiting groove, the first limiting groove and the second limiting groove are joined together to form a limiting hole, a limiting element is provided in the limiting hole, and a third limiting groove is provided on the second outer wall surface of the wear-resistant part, which is directly opposite to the limiting hole.

[0014] Furthermore, the body has a first end and a second end opposite to each other along the axial direction. The first inner wall surface is provided with a first limiting part near the second end, and the second outer wall surface is provided with a second limiting part near the second end. The first limiting part and the second limiting part are adapted to form an axial limiting structure.

[0015] Furthermore, the second inner wall surface is a working surface, which is an ultra-finely machined smooth surface with a roughness of less than 2 microinches.

[0016] Furthermore, the pump composite ring includes a throttling bushing, the inner surface of which is entirely cylindrical.

[0017] A centrifugal pump comprising any of the above-described pump composite ring sleeves.

[0018] Furthermore, the composite ring for the pump includes any one or a combination of the following: throat bushing, throttling bushing, center bushing, primary body mouth ring, and secondary body mouth ring.

[0019] The technical solution of this utility model has the following significant beneficial effects:

[0020] In this embodiment, by setting guide structures at the inlet and outlet ends of the pump composite ring body, the flow direction of the medium containing abrasive particles can be smoothly guided, the generation of eddies and turbulence can be suppressed, and the erosion wear, three-body wear and local material loss caused by abrupt changes in flow direction can be reduced. For the body adopting a composite structure combining the matrix and wear-resistant parts, the shapes of the adjacent inner and outer walls between the wear-resistant parts and the matrix are matched, which can ensure that the wear-resistant parts and the matrix are tightly fitted and the stress is uniform, avoiding local stress concentration, improving the overall structure and assembly stability, so that the pump composite ring can maintain reliable operation under high abrasion, high flow velocity and strong particle impact conditions, significantly extend service life and ensure pump working efficiency.

[0021] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is a half-sectional view of a centrifugal pump provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a composite ring sleeve for a pump provided in the embodiments of this application;

[0025] Figure 3 This is a cross-sectional view of a composite ring sleeve for a pump provided in an embodiment of this application;

[0026] Figure 4This is a schematic diagram of the structure of the base of a composite ring sleeve for a pump provided in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the structure of a wear-resistant component for a pump composite ring sleeve provided in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram of another composite ring sleeve for pumps provided in the embodiments of this application;

[0029] Figure 7 This is a cross-sectional view of another composite ring for pumps provided in the embodiments of this application.

[0030] The reference numerals in the above figures are as follows:

[0031] 1. Throat liner;

[0032] 2. Throttling bushing;

[0033] 3. Center bushing;

[0034] 4. First-stage oral ring;

[0035] 5. First-stage body mouth ring;

[0036] 6. Secondary body mouth ring;

[0037] 10. Matrix;

[0038] 101. First docking section;

[0039] 102. Second docking section;

[0040] 11. The first inner wall surface;

[0041] 12. First outer wall surface;

[0042] 13. First limiting groove;

[0043] 14. Second limiting groove;

[0044] 15. First limiting part;

[0045] 20. Wear-resistant parts;

[0046] 21. The second inner wall surface;

[0047] 22. Second outer wall surface;

[0048] 23. Entrance end;

[0049] 24. Export end;

[0050] 25. Guiding structure;

[0051] 26. Third limiting groove;

[0052] 27. Second limiting part;

[0053] 30. Fasteners;

[0054] 31. Limiting components;

[0055] 32. Limiting hole. Detailed Implementation

[0056] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] The composite pump sleeve provided in this application is mainly used in centrifugal pumps containing high concentrations of hard abrasive particles. Its working principle is based on the optimized matching of the fluid flow pattern and the erosion mechanism inside the pump, as detailed below:

[0059] Media containing abrasive particles enters the pump body and impeller eye through the pump inlet. Under the action of impeller rotation, the abrasive particles are thrown outward by centrifugal force and pushed back to the central area of ​​the pump body at the flow channel intersection. When the pump stops, abrasive particles will deposit in the gaps of the inlet ring, bushing, etc. When the pump restarts, under pressure, the particles are forced through the narrow gap between the ring and the mating shaft, which can easily cause erosion and abrasive wear on the inner wall and end of the ring.

[0060] This invention provides a composite ring sleeve for pumps and a centrifugal pump. Through structural optimization, the wear resistance and erosion resistance of the ring sleeve are improved, extending its service life, while ensuring assembly stability and operational reliability.

[0061] Please refer to the following for comprehensive information. Figures 1 to 7 This application specification provides a composite ring sleeve for a pump, which may include: a ring-shaped body having an opposing inlet end 23 and an outlet end 24 along the axial direction, with a guide structure 25 provided at the transition position between the inlet end 23 and the outlet end 24 and the inner surface of the body; the body includes: a substrate 10 and a wear-resistant component 20, the substrate 10 and the wear-resistant component 20 being integrally formed or fitted and fixed, when the substrate 10 and the wear-resistant component 20 are fitted and fixed, the substrate 10 having opposing first inner wall surface 11 and first outer wall surface 12 along the radial direction; the wear-resistant component 20 is located at the first inner wall surface 11 of the substrate 10, and the wear-resistant component 20 has opposing second inner wall surface 21 and second outer wall surface 22 along the radial direction, the second outer wall surface 22 being adapted to the shape of the first inner wall surface 11.

[0062] Considering that the abrasive particles in the pump are thrown out by centrifugal force and flow back to the center, high-speed impact and eddy currents are formed at the gap of the ring sleeve, which can easily cause erosion, three-body wear and two-body wear. In this embodiment, the guide structure 25 gently guides the flow of the medium, alleviates the sudden change in flow direction, suppresses the formation of eddy currents and turbulence, and reduces the high-speed erosion and cutting wear of the abrasive particles on the end of the ring sleeve and the inner wall.

[0063] The guide structure 25 may include rounded corners or chamfers. When the guide structure 25 is chamfered, it can be a 45° chamfer. The dimensions of the guide structure 25 refer to the radius of the rounded corner or the length of the chamfer side.

[0064] Since the sharp corners at the inlet and outlet of the ring sleeve gap are the starting points of eddies, these eddies significantly increase particle concentration and exacerbate local material loss. Using rounded or chamfered corners can eliminate these sharp corners, preventing flow separation, vortices, and localized high-speed scouring at the corners. This significantly reduces material spalling, pitting, and groove wear caused by eddy current erosion. Furthermore, the structure is easy to manufacture and low in cost, significantly improving the ring sleeve's anti-abrasion capability without adding complex processes.

[0065] Wherein, when the axial length of the body is less than 1 inch, the size of the guide structure 25 is not less than 1 / 32 inch.

[0066] For small-sized rings with a short axial length, the gap is smaller and the flow channel is shorter, making it easier for particles to form local impacts and micro-vortices at the ends. When the size of the guide structure 25 is not less than 1 / 32 inch, the smooth transition of the medium can be ensured without affecting the assembly clearance, preventing erosion, peeling and local wear at the ends of small-sized rings, and ensuring that short-sized rings also have stable anti-abrasion performance.

[0067] When the axial length of the body is greater than 1 inch, the size of the guide structure 25 is at least 1 / 16 inch.

[0068] For long-length rings with large axial dimensions, the flow channels are long, and the medium stays in the gap for a longer time, which easily leads to the formation of secondary eddies and continuous erosion. When the size of the guide structure 25 is at least 1 / 16 inch, the flow guiding effect of long-distance channels can be further optimized, the generation of secondary eddies can be continuously suppressed, the wear rate along the inner wall of the ring can be comprehensively reduced, and the uniform wear of the long-stroke ring can be ensured.

[0069] In this embodiment, the body may include a substrate 10 and a wear-resistant component 20. The substrate 10 and the wear-resistant component 20 may be integrally formed or fitted together.

[0070] When the substrate 10 and the wear-resistant component 20 are integrally formed, it is equivalent to the entire body being integrally formed into a full ceramic structure, forming a single wear-resistant component 20. This wear-resistant component 20 can be made of wear-resistant materials, such as ceramic materials. When the wear-resistant component 20 uses ceramic materials, it can be a magnesium-doped partially stabilized zirconia material (zirconia composite ceramic material) with excellent deformation strengthening properties, containing a 96.5% ZrO2 and HfO2 composition and 3.5% MgO. This zirconia composite ceramic material has the following characteristics: high mechanical strength, excellent wear resistance and abrasion resistance, extremely low thermal conductivity, and good thermal shock resistance. The coefficient of thermal expansion of the zirconia composite ceramic material is closer to that of steel, ensuring thermal expansion and eliminating the risk of damage from interference fit. In addition, the wear-resistant component 20 can also use other ceramic materials, such as zirconia, silicon carbide, tungsten carbide, and chromium carbide.

[0071] When the substrate 10 is fitted and fixed to the wear-resistant component 20, the wear-resistant component 20 can be fitted and fixed to the inner side of the substrate 10. The substrate 10 can be made of a metallic material, and the wear-resistant component 20 can be made of a wear-resistant material, such as a ceramic material. When the wear-resistant component 20 is made of a ceramic material, it can be a magnesium-doped partially stabilized zirconia material (zirconia composite ceramic material) with excellent deformation strengthening properties, containing a 96.5% ZrO2 and HfO2 composition and doped with 3.5% MgO. This zirconia composite ceramic material has the following characteristics: high mechanical strength, excellent wear resistance and abrasion resistance, extremely low thermal conductivity, and good thermal shock resistance. The coefficient of thermal expansion of the zirconia composite ceramic material is closer to that of steel, ensuring thermal expansion and eliminating the risk of damage from interference fit.

[0072] In the embodiments of this application, the example mainly focuses on the fitting and fixing of the substrate 10 and the wear-resistant part 20. When the substrate 10 and the wear-resistant part 20 are integrally formed, the embodiment can refer to the above embodiment of the fitting and fixing of the substrate 10 and the wear-resistant part 20.

[0073] When the substrate 10 is fitted and fixed with the wear-resistant part 20, the shape of the second outer wall surface 22 of the wear-resistant part 20 is adapted to the shape of the first inner wall surface 11 of the substrate 10, so that the two fit tightly and the force is uniform, avoiding local stress concentration that could cause the wear-resistant part 20 to crack, loosen or fall off. At the same time, it ensures the stability of the overall structure of the ring, enabling it to adapt to harsh working conditions with high abrasion, high flow rate and strong particle impact, and significantly extending its service life.

[0074] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the base 10 includes a first mating portion 101 and a second mating portion 102 that are detachably connected, and a fastener 30 for connecting the first mating portion 101 and the second mating portion 102.

[0075] In this embodiment, the base 10 can adopt a split structure, which may include a detachably connected first mating portion 101 and a second mating portion 102. The first mating portion 101 and the second mating portion 102 can each be a semi-circular ring, connected by fasteners 30. The fasteners 30 ensure that the split base 10 forms a complete rigid ring when closed, ensuring roundness, coaxiality, and structural integrity, and preventing abnormal widening of the gap due to deformation of the base 10 during operation. Specifically, the fasteners 30 can be in the form of bolts or screws.

[0076] When the substrate 10 adopts the above-mentioned split structure, it facilitates the pressing, disassembly, replacement and on-site assembly of the ceramic wear-resistant parts 20, which helps to reduce the difficulty of installation and maintenance.

[0077] In one embodiment, the first docking portion 101 has a first docking surface facing the second docking portion 102, and the second docking portion 102 has a second docking surface facing the first docking portion 101. A first limiting groove 13 is provided on the first docking surface of the substrate 10, and a second limiting groove 14 is provided on the second docking surface. The first limiting groove 13 and the second limiting groove 14 are joined together to form a limiting hole 32. A limiting member 31 is provided in the limiting hole 32, and a third limiting groove 26 is provided on the second outer wall surface 22 of the wear-resistant part 20, which is directly opposite to the limiting hole 32.

[0078] In this embodiment, a circular arc groove may be provided at the center of the first mating surface of the first mating portion 101 facing the second mating portion 102, and a circular arc groove may also be provided at the center of the second mating surface of the second mating portion 102 facing the first mating portion 101. The positions of the two circular arc grooves are matched and can be spliced ​​to form a limiting hole 32. The limiting hole 32 is used to pass through the limiting member 31. Specifically, the limiting member 31 can be a positioning pin, or it can be other forms. This application does not make specific limitations here.

[0079] Considering that the ring sleeve is prone to circumferential rotation, radial displacement and loosening under the action of particle impact and rotor vibration.

[0080] In this embodiment, the limiting member 31 and the limiting hole 32 can be used to achieve precise positioning of the split base 10, preventing circumferential misalignment and radial displacement. The limiting member 31 also cooperates with the third limiting groove 26 of the wear-resistant part 20 to achieve dual circumferential and radial positioning of the base 10 and the wear-resistant part 20, avoiding relative rotation and movement, and improving the overall assembly stability of the ring from multiple dimensions.

[0081] In one embodiment, the body has a first end and a second end opposite to each other along the axial direction. The first inner wall surface 11 is provided with a first limiting part 15 near the second end, and the second outer wall surface 22 is provided with a second limiting part 27 near the second end. The first limiting part 15 and the second limiting part 27 are adapted to form an axial limiting structure.

[0082] Considering that pressure fluctuations and axial thrust of the medium during pump start-up and shutdown may cause slippage or detachment of the wear-resistant part 20, an axial limiting structure is set to effectively prevent the wear-resistant part 20 from axially moving, slipping, or detaching under the action of medium pressure, impact, and axial thrust. This ensures a stable bond between the wear-resistant part 20 and the base 10, and improves the operational reliability of the ring under frequent start-up and shutdown and changing operating conditions.

[0083] Specifically, the first limiting part 15 and the second limiting part 27 can be in the form of a limiting step, or the first limiting part 15 and the second limiting part 27 can be in other forms, which are not specifically limited here.

[0084] In one embodiment, the second inner wall surface 21 is a working surface, which is an ultra-finely machined smooth surface with a roughness of less than 2 microinches.

[0085] Considering that the degree of wear is closely related to particle flow rate and surface roughness, surface micro-protrusions are prone to pitting and peeling due to repeated impacts from particles. In this embodiment, by forming the second inner wall surface 21 into an ultra-smooth surface, the surface micro-irregularity can be significantly reduced, thereby reducing micro-cutting, groove wear, and repeated impact damage to the surface by abrasive particles, reducing fluid resistance, slowing down the gap expansion rate, reducing internal leakage, and maintaining the pump's operating efficiency.

[0086] like Figure 6 and Figure 7 As shown, in one embodiment, the pump composite ring includes a throttling bushing 2, the inner surface of which is entirely cylindrical.

[0087] The inventors of this application have discovered that the annular groove of the traditional throttling bushing 2 is prone to accumulating abrasive particles, which can cause eddies, local high pressure drops and severe erosion, making it the area with the most severe wear.

[0088] In this embodiment, the throttling bushing 2 adopts a composite ring structure. The inner surface of the throttling bushing 2 is a smooth cylindrical surface, eliminating the traditional annular groove, which can avoid the accumulation of abrasive particles and eliminate the flow disturbance and localized strong wear caused by the groove; by reasonably setting the bushing length and clearance, the pump leakage and rotor dynamic stability can be guaranteed to meet the standard requirements, and the service life of the throttling bushing 2 can be extended.

[0089] The throttling bushing 2 can be integrally formed from a wear-resistant component 20, with its inner surface corresponding to the second inner wall surface 21 of the wear-resistant component 20. Of course, in this embodiment, it is not excluded that the throttling bushing 2 can be formed by fitting and fixing the base 10 and the wear-resistant component 20 together.

[0090] like Figure 1 As shown in the figure, this application also provides a centrifugal pump, which includes the above-mentioned pump composite ring sleeve. By setting the pump composite ring sleeve, the centrifugal pump can achieve the technical effect achieved by the pump composite ring sleeve embodiment. For details, please refer to the specific description of the above embodiment, which will not be repeated here.

[0091] In one embodiment, the pump composite ring includes any one or a combination of the following: throat bushing 1, throttling bushing 2, center bushing 3, primary body port ring 4, and secondary body port ring. The secondary body port ring may include a primary body port ring 5 and a secondary body port ring 6.

[0092] The flow velocity and abrasion are highest in parts such as the inner inlet ring and bushing of centrifugal pumps. An optimized composite ring structure is adopted for these core vulnerable parts, achieving full-area abrasion resistance enhancement. This comprehensively improves the overall durability, operational stability, and working efficiency of the centrifugal pump, making it more suitable for harsh and highly abrasive working conditions such as water injection, oil sand treatment, and asphalt / water emulsion applications.

[0093] This application suppresses the aforementioned wear through structural design: a guide structure 25 is provided at the inlet end 23 and outlet end 24 of the wear-resistant ring 20 to make the change in the flow direction of the medium more gradual, eliminate secondary eddies caused by sharp edges, and reduce eddy erosion and local material loss; the working surface of the wear-resistant ring 20 is set as an ultra-finely machined smooth surface to reduce the erosion caused by repeated impact of particles on the surface micro-protrusions, and further improve the wear resistance.

[0094] Specifically, for the center bushing 3, a split metal substrate 10 and ceramic wear-resistant part 20 are embedded and combined, which not only ensures the structural strength and assembly convenience of the substrate 10, but also utilizes the ceramic wear-resistant part 20 to achieve high wear resistance and erosion resistance. An axial limiting structure is set between the substrate 10 and the wear-resistant part 20 to prevent the wear-resistant part 20 from axially moving under fluid impact and to ensure operational stability.

[0095] For the throttling bushing 2, the traditional annular groove is eliminated, and the inner wall is set as a complete smooth cylindrical surface to prevent abrasive particles from accumulating in the groove, thereby eliminating the flow disturbance and local wear aggravation caused by the groove. At the same time, by reasonably setting the bushing length and fitting clearance, the leakage of the pump and the rotor dynamic performance are ensured to meet the usage requirements.

[0096] Through the above-mentioned structural and flow field optimization, this application can significantly reduce three-body wear, two-body wear and erosion wear, slow down the gap expansion rate, reduce internal leakage of the pump, maintain the working efficiency of the pump, and effectively extend the service life of the composite ring sleeve and centrifugal pump under high abrasive conditions.

[0097] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of the disclosure “a” or “an” to describe an element, component, part, or step is not intended to exclude other elements, components, parts, or steps.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A composite ring sleeve for a pump, characterized in that, The pump composite ring sleeve includes: a ring-shaped body, the body having an opposite inlet end and an outlet end along the axial direction, and a guide structure provided at the transition position between the inlet end and the outlet end and the inner surface of the body; The body includes a substrate and a wear-resistant component. The substrate and the wear-resistant component are integrally formed or fitted and fixed. When the substrate and the wear-resistant component are fitted and fixed, the substrate has a first inner wall surface and a first outer wall surface that are opposite each other along the radial direction. The wear-resistant component is located at the first inner wall surface of the substrate. The wear-resistant component has a second inner wall surface and a second outer wall surface that are opposite each other along the radial direction. The shape of the second outer wall surface is adapted to the shape of the first inner wall surface.

2. The composite ring sleeve for pumps as described in claim 1, characterized in that, The guide structure includes rounded corners or chamfers.

3. The composite ring sleeve for pumps as described in claim 2, characterized in that, When the axial length of the body is less than 1 inch, the size of the guide structure is not less than 1 / 32 inch.

4. The composite ring sleeve for pumps as described in claim 2, characterized in that, When the axial length of the body is greater than 1 inch, the size of the guide structure is at least 1 / 16 inch.

5. The composite ring sleeve for pumps as described in claim 1, characterized in that, The base includes a detachably connected first mating portion and a second mating portion, and fasteners for connecting the first mating portion and the second mating portion.

6. The composite ring sleeve for pumps as described in claim 5, characterized in that, The first docking portion has a first docking surface facing the second docking portion, and the second docking portion has a second docking surface facing the first docking portion. A first limiting groove is provided on the first docking surface of the substrate, and a second limiting groove is provided on the second docking surface. The first limiting groove and the second limiting groove are joined together to form a limiting hole. A limiting element is provided in the limiting hole, and a third limiting groove is provided on the second outer wall surface of the wear-resistant part, which is directly opposite to the limiting hole.

7. The composite ring sleeve for pumps as described in claim 1, characterized in that, The body has a first end and a second end opposite to each other along the axial direction. The first inner wall surface is provided with a first limiting part near the second end, and the second outer wall surface is provided with a second limiting part near the second end. The first limiting part and the second limiting part are adapted to form an axial limiting structure.

8. The composite ring sleeve for pumps as described in claim 1, characterized in that, The second inner wall surface is the working surface, which is an ultra-finely machined smooth surface with a roughness of less than 2 microinches.

9. The composite ring sleeve for pumps as described in claim 1, characterized in that, The composite ring sleeve for the pump includes a throttling bushing, the inner surface of which is entirely cylindrical.

10. A centrifugal pump, characterized in that, The centrifugal pump includes the pump composite ring sleeve as described in any one of claims 1-9.

11. The centrifugal pump as claimed in claim 10, characterized in that, The composite ring for the pump includes any one or a combination of the following: throat bushing, throttling bushing, center bushing, primary body mouth ring, and secondary body mouth ring.

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