A polymer composite silicon carbide ceramic lined wear-resistant circulating pump

Abstract

This invention relates to the field of circulating pump technology, specifically to a wear-resistant circulating pump lined with polymer composite silicon carbide ceramic. The pump includes a pump casing, an impeller located between the inlet and outlet, and a volute flow channel enclosing the impeller. The inner wall of the pump casing is provided with an inner lining body. Four metal inserts are pre-embedded in the circumferential position of the inner lining body near the outlet end. Each metal insert is connected to a set of tensioning units. Each tensioning unit includes a steel wire rope. One end of the steel wire rope is fixedly connected to the corresponding metal insert, and the other end passes through a through-hole opened in the outer wall of the pump casing and leads out to the outside of the pump casing. A ceramic tube sleeve is embedded in the through-hole. After the steel wire rope passes around a support roller fixed to the outer wall of the pump casing, it is connected to the end of a piston rod via a connecting rod. The piston rod is slidably fitted inside a piston cylinder, which is fixedly installed on the outer wall of the pump casing. The piston cylinder is connected to the high-pressure area inside the pump casing via a drain pipe. This invention places the pressure tapping hole of the drainage pipe in the high-pressure zone behind the volute tongue, and uses the highest static pressure inside the pump to drive the tensioning unit, so that the lining body fits tightly against the pump casing during operation, effectively preventing the slurry from being washed away and significantly extending the service life of the lining.

Description

Technical Field

[0001] This invention relates to the field of circulating pump technology, and specifically to a wear-resistant circulating pump lined with polymer composite silicon carbide ceramic. Background Technology

[0002] Circulating pumps are widely used in thermal power generation, metallurgy, mining and chemical industries to transport highly abrasive slurries containing high concentrations of solid particles. These pumps typically employ a centrifugal structure, including a pump casing, impeller, and a volute flow channel that encloses the impeller. The inner wall of the pump casing is often lined with wear-resistant materials (such as rubber, ceramics or polymer composites) to resist slurry erosion. However, due to the high slurry velocity and high particle hardness, especially in the volute tongue area near the volute outlet, local erosion is extremely severe, posing a serious challenge to the reliability of the lining.

[0003] A search revealed a Chinese patent publication number (CN207131623U) for a wear-resistant circulating pump lined with a polymer composite silicon carbide ceramic. The pump includes an impeller and a shaft, connected to each other. The shaft is located at the rear of the impeller, and a pump body is located outside the impeller. A wear-resistant plate is mounted on the pump body, and a pressure cap is located next to the wear-resistant plate. A bearing housing is located outside the shaft, and a rear pump cover is located on the pump body. A bracket is located at the lower end of the pump body. The wear-resistant plate inside the circulating pump enhances the internal wear resistance of the pump body, making the pump more wear-resistant overall and improving its stable performance. The presence of a sealing component inside the pump further improves the sealing performance between the shaft and the pump body, facilitating stable and smooth shaft operation.

[0004] In existing technologies, the liner is usually fixed to the inner wall of the pump casing by adhesive or mechanical clamps. However, during long-term operation, high-speed slurry can easily seep into the back side through the tiny assembly gap between the liner and the pump casing, forming a back scouring effect. This can lead to local bulging, delamination, or even perforation failure of the liner. Especially in the initial stage of pump startup or under pressure fluctuation conditions, the liner cannot dynamically fit the pump casing, which exacerbates the flow through the gap. Although some solutions attempt to use external hydraulic devices to pre-tighten the liner, these often rely on additional power sources, have complex structures, and are difficult to respond to pressure changes in real time during operation.

[0005] Therefore, there is an urgent need for an inner liner fixing technology that does not require modification of the pump body structure and can achieve self-adaptive compression using the pump's own hydraulics, so as to effectively suppress back scouring and extend the service life of the circulating pump under high wear conditions. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention solves the problem that the existing circulating pump liner is statically fixed and cannot dynamically fit the pump shell, which causes slurry to seep into the back side, resulting in bulging, delamination and perforation failure.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner, including a pump casing, an impeller located between the inlet and the outlet, and a volute flow channel surrounding the impeller. The inner wall of the pump casing is provided with an inner liner body, and four metal inserts are pre-embedded in the circumferential position near the outlet end of the inner liner body. Each metal insert is connected to a set of tensioning units. The tensioning unit includes a steel wire rope. One end of the steel wire rope is fixedly connected to a corresponding metal insert, and the other end passes through a through hole opened on the outer wall of the pump casing and leads out to the outside of the pump casing. A ceramic tube sleeve is embedded in the through hole. After the steel wire rope passes around the support roller fixed on the outer wall of the pump casing, it is connected to the end of the piston rod through a connecting rod. The piston rod is slidably fitted in the piston cylinder. The piston cylinder is fixedly installed on the outer wall of the pump casing. The piston cylinder is connected to the high-pressure area inside the pump casing through a drain pipe. When the pump is running, the pressurized slurry inside the pump enters the piston cylinder through the diversion pipe, pushing the piston rod to extend. Then, the connecting rod and wire rope simultaneously apply radial tension, making the inner lining body tightly fit the inner wall of the pump casing.

[0008] Furthermore, the outlet end of the drainage pipe is connected to the inlet of the piston cylinder. The piston cylinder is equipped with a sliding piston plate. A piston rod is fixedly connected to one side of the piston plate. The piston rod passes through the end of the piston cylinder and extends to the outside. A return spring is sleeved on the piston rod to drive the piston plate to return to its original position when the pump stops.

[0009] Furthermore, the piston cylinder has a drain pipe on the rodless chamber side, and a one-way valve is installed on the drain pipe to discharge the liquid in the chamber when the piston is reset.

[0010] Furthermore, one end of the drainage pipe is connected to the pressure tapping hole on the side wall of the pump casing, and the other end is connected to the rodless chamber of the piston cylinder via a liquid inlet check valve and a filter in sequence. The filter screen has a mesh size of 0.5 mm to 1.5 mm and is used to intercept large solid impurities in the slurry.

[0011] Furthermore, the support roller is fixed to the outer wall of the pump casing by a mounting bracket, and the groove surface of the support roller is covered with a polyurethane layer of 1 mm to 2 mm thickness to reduce the friction and wear of the wire rope 31.

[0012] Furthermore, the metal insert is a cylindrical stainless steel block, which is pre-embedded during the manufacturing process of the inner lining body. The exposed end face of the metal insert is provided with an internal threaded hole, and the end of the steel wire rope is rigidly connected to the internal threaded hole by bolts.

[0013] Furthermore, a dynamic sealing assembly is provided at the through-hole of the pump casing. The dynamic sealing assembly includes a polytetrafluoroethylene scraper ring, a fluororubber main sealing ring, and an adjustable sealing gland arranged sequentially from the inside to the outside.

[0014] Furthermore, the ceramic sleeve is made of silicon carbide, and its inner diameter is 0.5 mm to 1 mm larger than the outer diameter of the wire rope. This is used to reduce friction and wear during the reciprocating motion of the wire rope and to work with the dynamic sealing assembly to achieve zero-leakage sealing during operation.

[0015] Furthermore, the inner lining body is composed of a polymer resin matrix and silicon carbide ceramic particles dispersed therein, wherein the polymer resin is selected from any one of epoxy resin, polyurethane or modified phenolic resin.

[0016] Furthermore, a corrosion-resistant flexible structural adhesive layer is coated between the inner liner body and the inner wall of the pump casing. The thickness of the structural adhesive layer does not exceed 0.3 mm and is used to assist in initial positioning and sealing of micro gaps. After the structural adhesive has initially cured, the tensioning unit applies the final working tension to achieve dynamic compression in the operating state.

[0017] Beneficial effects 1. The technical solution provided by this invention is designed for high scouring conditions. When the pressure tapping hole of the drainage pipe is located in the high-pressure area behind the volute tongue, the piston cylinder can be driven by the highest static pressure inside the volute after the pump starts. This allows the tensioning unit to quickly apply radial tension, firmly pressing the liner body against the inner wall of the pump casing. This structure effectively prevents high-speed slurry from seeping into the back of the liner in the outlet area, avoiding bulging, delamination, or perforation failure caused by back scouring, and improving the service life of the liner body.

[0018] 2. This invention addresses the challenges of frequent temperature changes or frequent start-stop operations by providing dynamic compensation for thermal deformation gaps. Since the pump casing is made of metal while the inner lining is a high-molecular-weight ceramic composite material, their coefficients of thermal expansion differ significantly. During pump heating and operation, the pump casing expands more than the inner lining, easily creating micron-level gaps. At this time, the tensioning unit maintains a constant tension under continuous water pressure, automatically closing the gap and maintaining a zero-gap fit. After shutdown and cooling, the reset spring releases the tension, facilitating maintenance. This mechanism fundamentally solves the problem of inner lining loosening caused by thermal cycling.

[0019] 3. The overall structure of this invention does not require modification of the pump casing flow channel or addition of an external power source. It can achieve self-tightening using only the pump's own operating pressure. Combined with the polymer composite silicon carbide liner, flexible structural adhesive layer, ceramic sleeve and dynamic sealing components, it takes into account wear resistance, sealing performance, maintainability and installation convenience. The four tensioning units are circumferentially distributed, and the force is evenly distributed to avoid local stress concentration. All perforations are located in the non-flow channel area of ​​the pump casing outer wall, which does not affect the hydraulic performance. Therefore, this invention significantly improves the long-term operating stability of the circulating pump under harsh conditions without sacrificing efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 This is a partial top view of the pump casing of the present invention; Figure 3 This is a cross-sectional schematic diagram of the tensioning unit structure of the present invention; Figure 4 This is a schematic diagram of the tensioning unit structure of the present invention; Figure 5 This is a schematic diagram of the inner lining body structure of the present invention; Figure 6 This is a schematic diagram of the ceramic tube sleeve structure of the present invention; Figure 7 This is a top view of the dynamic sealing assembly structure of the present invention; Figure 8 This is a schematic diagram of the distribution of the tensioning units of the present invention.

[0022] Reference numerals: 1. Inner liner body; 11. Metal insert; 2. Pump casing; 21. Ceramic sleeve; 22. Dynamic sealing assembly; 221. Sludge scraper ring; 222. Main sealing ring; 223. Sealing gland; 3. Tensioning unit; 31. Steel wire rope; 32. Support roller; 33. Piston cylinder; 34. Piston plate; 35. Piston rod; 36. Return spring; 37. Connecting rod; 38. Drain pipe; 39. Mounting bracket; 4. Drainage pipe; 41. Filter. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] The present invention will be further described below with reference to embodiments.

[0025] Example 1 See attached document Figure 1-8A wear-resistant circulating pump lined with polymer composite silicon carbide ceramic includes a pump casing 2, an impeller installed between the inlet and outlet, and a volute flow channel surrounding the impeller.

[0026] The inner wall of the pump casing 2 is provided with an inner liner body 1 composed of a polymer resin matrix and dispersed silicon carbide ceramic particles. The polymer resin can be selected from any one of epoxy resin, polyurethane or modified phenolic resin to take into account both wear resistance and toughness.

[0027] At the circumferential position near the outlet end of the pump casing 2, four metal inserts 11 are pre-embedded in the inner liner body 1. The metal inserts 11 are cylindrical stainless steel blocks that are integrally embedded during the molding process of the inner liner body 1. Their exposed end faces are machined with internal threaded holes. Each set of metal inserts 11 is rigidly connected to a steel wire rope 31 of the tensioning unit 3 by bolts.

[0028] like Figure 3 As shown, the other end of the wire rope 31 passes through a through hole opened on the outer wall of the pump housing 2 and is led out to the outside of the pump housing 2. A silicon carbide ceramic sleeve 21 is embedded in the through hole. Its inner diameter is 0.5 mm to 1 mm larger than the outer diameter of the wire rope 31. This can reduce the friction and wear of the wire rope 31 during reciprocating motion and provide a stable channel for dynamic sealing.

[0029] At each perforation position on the outer wall of the pump casing 2, a support roller 32 is fixed by the mounting bracket 39. The function of the support roller 32 is to support and guide the steel wire rope 31 under tension, change its force direction, and make the tension point radially toward the center of the pump casing 2, thereby ensuring that the inner liner body 1 fits evenly against the inner wall of the pump casing 2.

[0030] The groove surface of the support roller 32 is covered with a polyurethane layer of 1 mm to 2 mm thickness to reduce the sliding friction of the wire rope 31 and absorb vibration.

[0031] After each wire rope 31 passes over the corresponding support roller 32, it is connected to the end of the piston rod 35 through a connecting rod 37. One end of the connecting rod 37 is hinged to one end of the piston rod 35, and the other end of the connecting rod 37 is connected to the wire rope 31. The piston rod 35 is slidably fitted inside the piston cylinder 33. The piston cylinder 33 is fixed to the outer wall of the pump housing 2 by a bracket. The piston cylinder 33 is provided with a sliding piston plate 34. One side of the piston plate 34 is fixedly connected to the piston rod 35, and the other side forms a rodless chamber. A return spring 36 is sleeved on the piston rod 35 to drive the piston to return to its original position when the pump stops.

[0032] Crucially, one end of the drain pipe 4 is connected to a pressure tap located 10° to 30° behind the volute tongue, i.e., the throat of the volute outlet, on the side wall of the pump casing 2. This area is the highest static pressure zone during pump operation. The other end of the drain pipe 4 is connected to the rodless chamber of the piston cylinder 33 via the inlet check valve and the filter 41.

[0033] The filter 41 has a cylindrical filter element structure. Its housing is fixed between the drain pipe 4 and the liquid inlet check valve. Inside, there is a detachable stainless steel sintered filter screen or a wedge-shaped wire mesh filter screen with a mesh size of 0.5 mm to 1.5 mm. It is used to intercept large solid particles in the slurry and prevent blockage of the piston cylinder 33.

[0034] When the pump starts running, the pressurized slurry enters the rodless chamber of the piston cylinder 33 through the diversion pipe 4, pushing the piston plate 34 to move and causing the piston rod 35 to extend. The piston rod 35 pulls the wire rope 31 through the connecting rod 37. Under the guidance of the support roller 32, the radial tension is applied synchronously to the four circumferential positions of the inner liner body 1, so that it fits tightly against the inner wall of the pump casing 2.

[0035] Meanwhile, a dynamic sealing assembly 22 is provided at the through hole of the pump casing 2. It includes a polytetrafluoroethylene scraper ring 221, a fluororubber main sealing ring 222 and a sealing gland 223 from the inside to the outside. The dynamic sealing assembly 22 can effectively scrape off the particles attached to the surface of the wire rope 31 and achieve zero leakage sealing in operation.

[0036] In addition, a corrosion-resistant flexible structural adhesive layer with a thickness of no more than 0.3 mm is coated between the inner liner body 1 and the inner wall of the pump casing 2. This layer is used to assist in the initial positioning during installation and to seal micro gaps. The tensioning unit 3 applies the final working tension after the structural adhesive has initially cured, so as to prevent the adhesive layer from bearing the main load.

[0037] Furthermore, such as Figure 8 As shown, four tensioning units 3 are provided on the outer side of the pump casing 2. The four tensioning units 3 are evenly distributed along the circumference of the inner wall of the pump casing 2. The corresponding metal inserts 11 are arranged at circumferential angles of +15°, +90°, −90° and +210°, with the location of the volute tongue as the reference 0°. Among them, the tensioning unit 3 located at +15° is close to the high-pressure area behind the volute tongue and serves as the main tensioning point, undertaking the main anti-scouring function. The other three tensioning units 3 serve as auxiliary support points and are located at the top, bottom and inlet end of the pump casing 2, respectively, forming a four-point symmetrical tensioning system to ensure that the inner liner body 1 is subjected to balanced force in the circumferential direction and prevent local warping or bulging. This layout makes full use of the structural space of the pump casing 2 without the need for additional openings. All through holes are opened in the non-flow channel area of ​​the outer wall of the pump casing 2 and do not affect the hydraulic performance.

[0038] Meanwhile, the rodless chamber side of the piston cylinder 33 is provided with a drain pipe 38, and a one-way valve is installed on the drain pipe 38. When the pump stops, the reset spring 36 pushes the piston plate 34 to retract, the volume of the rodless chamber decreases, and the residual slurry in the chamber is discharged to the pump inlet or external collection chamber through the drain pipe 38 and the one-way valve, so as to realize the rapid depressurization and complete reset of the piston cylinder 33, and avoid the wire rope 31 from being unable to loosen due to residual pressure, thereby ensuring that the inner liner body 1 can be easily disassembled during maintenance.

[0039] In the above structure, the drainage pipe 4, piston cylinder 33, discharge pipe 38 and dynamic sealing component 22 together form a closed-loop adaptive tensioning system. It automatically locks during operation and automatically releases when stopped. No external energy intervention is required throughout the process. The support roller 32 not only supports the steel wire rope 31 to make it taut, but also buffers high-frequency vibration through the polyurethane coating layer, which significantly extends the life of the steel wire rope 31. The whole system achieves intelligent fitting of the liner without changing the internal flow channel structure of the pump, and has both high reliability and easy maintenance.

[0040] The technical effect of this embodiment is that the tensioning unit 3 is driven by the pressure of the high-pressure zone behind the volute tongue, and the lining is self-tightened and bonded at the moment the pump starts. This effectively prevents high-speed slurry from seeping into the back of the lining body 1 from the outlet area, and fundamentally avoids bulging, delamination or perforation failure caused by back scouring. It is especially suitable for high-concentration, high-flow-rate slurry transportation conditions.

[0041] Example 2 The pump body structure in this embodiment is basically the same as that in Embodiment 1, the difference being in the application scenario and control logic.

[0042] In some operating conditions with frequent start-stop cycles and large temperature variations, the pump casing 2, which is usually made of cast iron or stainless steel, has a significantly different coefficient of thermal expansion compared to the inner lining body 1, which is made of polymer ceramic composite material.

[0043] Although a small assembly gap of about 0.3–0.8 mm is reserved during cold installation, the expansion of the metal pump casing 2 is greater than that of the inner lining body 1 after the pump is heated during operation, resulting in a gap between the two. The slurry can easily seep into the back of the inner lining body 1 and cause erosion.

[0044] In this embodiment, the drainage tube 4 is still connected to the high-pressure area behind the volute tongue, but it is emphasized that the tensioning unit 3 maintains a constant tension throughout the entire operating cycle. Since the piston cylinder 33 is always connected to the high pressure inside the pump, as long as the pump is running, the piston rod 35 remains in the extended state. The wire rope 31 continuously applies radial tension, dynamically closing the gap caused by thermal expansion, so that the inner liner body 1 always maintains a zero-gap fit with the pump casing 2.

[0045] When the pump stops to cool down, the return spring 36 pushes the piston plate 34 back to its original position. At the same time, the liquid in the rodless chamber of the piston cylinder 33 is discharged through the one-way valve on the drain pipe 38, releasing the tension and facilitating subsequent maintenance or replacement of the inner liner body 1.

[0046] The technical advantage of this embodiment is that it can automatically compensate for thermal deformation gaps by relying solely on the pump's own pressure without the need for additional sensors or control systems, effectively solving the problem of lining loosening under temperature change conditions and significantly improving the reliability and lifespan of the equipment under intermittent operation conditions.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear-resistant circulating pump lined with polymer composite silicon carbide ceramic, comprising a pump casing (2), an impeller located between the inlet and outlet, and a volute flow channel enclosing the impeller, characterized in that: The pump casing (2) has an inner liner body (1) on its inner wall. The inner liner body (1) has four metal inserts (11) embedded in the circumferential position near the outlet end. Each metal insert (11) is connected to a set of tensioning units (3). The tensioning unit (3) includes a steel wire rope (31). One end of the steel wire rope (31) is fixedly connected to the corresponding metal insert (11), and the other end passes through a through hole opened on the outer wall of the pump housing (2) and is led out to the outside of the pump housing. A ceramic tube sleeve (21) is embedded in the through hole. After the steel wire rope (31) passes around the support roller (32) fixed on the outer wall of the pump housing (2), it is connected to the end of the piston rod (35) through the connecting rod (37). The piston rod (35) is slidably fitted in the piston cylinder (33). The piston cylinder (33) is fixedly installed on the outer wall of the pump housing (2). The piston cylinder (33) is connected to the high pressure area inside the pump housing (2) through the drain pipe (4). When the pump is running, the pressurized slurry inside the pump enters the piston cylinder (33) through the diversion pipe (4), pushing the piston rod (35) to extend. Then, the radial tension is applied synchronously through the connecting rod (37) and the wire rope (31), so that the inner lining body (1) fits tightly against the inner wall of the pump casing (2).

2. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 1, characterized in that, The outlet of the drain pipe (4) is connected to the inlet of the piston cylinder (33). The piston cylinder (33) is provided with a sliding piston plate (34). A piston rod (35) is fixedly connected to one side of the piston plate (34). The piston rod (35) passes through the end of the piston cylinder (33) and extends to the outside. A reset spring (36) is sleeved on the piston rod (35) to drive the piston plate (34) to reset when the pump stops.

3. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 2, characterized in that, The piston cylinder (33) has a drain pipe (38) on the rodless chamber side, and a one-way valve is installed on the drain pipe (38) to discharge the liquid in the chamber when the piston is reset.

4. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 3, characterized in that, One end of the drain pipe (4) is connected to the pressure tapping hole on the side wall of the pump casing (2), and the other end is connected to the rodless chamber of the piston cylinder (33) via the liquid inlet check valve and the filter (41). The filter screen of the filter (41) has a mesh size of 0.5 mm to 1.5 mm and is used to intercept large solid impurities in the slurry.

5. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 1, characterized in that, The support roller (32) is fixed to the outer wall of the pump housing (2) by the mounting bracket (39). The groove surface of the support roller (32) is covered with a polyurethane layer of 1 mm to 2 mm thickness to reduce the friction and wear of the wire rope (31).

6. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 5, characterized in that, The metal insert (11) is a cylindrical stainless steel block, which is pre-embedded during the manufacturing process of the inner lining body (1). The exposed end face of the metal insert (11) is provided with an internal thread hole, and the end of the wire rope (31) is rigidly connected to the internal thread hole by bolts.

7. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 1, characterized in that, The pump housing (2) has a through hole with a dynamic sealing assembly (22). The dynamic sealing assembly (22) includes a polytetrafluoroethylene scraper ring (221), a fluororubber main sealing ring (222), and an adjustable sealing gland (223) arranged sequentially from the inside to the outside.

8. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 1, characterized in that, The ceramic sleeve (21) is made of silicon carbide and its inner diameter is 0.5 mm to 1 mm larger than the outer diameter of the wire rope (31). It is used to reduce the friction and wear of the wire rope (31) during reciprocating motion and to work with the dynamic sealing assembly (22) to achieve zero leakage sealing in operation.

9. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 1, characterized in that, The inner lining body (1) is composed of a polymer resin matrix and silicon carbide ceramic particles dispersed therein, wherein the polymer resin is selected from any one of epoxy resin, polyurethane or modified phenolic resin.

10. The wear-resistant circulating pump with a polymer composite silicon carbide ceramic liner according to claim 9, characterized in that, The inner lining body (1) and the inner wall of the pump casing (2) are coated with a corrosion-resistant flexible structural adhesive layer. The thickness of the structural adhesive layer is no more than 0.3 mm. It is used to assist in initial positioning and micro gap sealing. The tensioning unit (3) applies the final working tension after the structural adhesive has initially cured, so as to achieve dynamic compression in the running state.

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