Wear-resistant ceramic pump body and manufacturing method thereof

Abstract

The invention discloses a wear-resistant ceramic pump body and a manufacturing method thereof, the wear-resistant ceramic pump body comprises a shell, a ceramic lining part and a first bonding layer located between the shell and the ceramic lining part and used for being filled with a bonding agent, and the shell is provided with a matching hole matched with a protective plate; a wear-resistant ceramic piece is arranged on the first bonding layer close to the matching hole; the wear-resistant ceramic piece is annular and is formed by splicing at least three ceramic sub-pieces, and the surfaces, facing the matching holes, of the ceramic sub-pieces are matched with the surfaces of the corresponding portions of the protection plate. By arranging the wear-resistant ceramic piece, the wear resistance of the first bonding layer close to the matching hole can be greatly improved. Besides, the wear-resistant ceramic part is annular and is formed by splicing at least three ceramic sub-parts, so that the matching degree of the radial inner surface of the wear-resistant ceramic part and the shaft surface of the corresponding protective plate is higher on the premise that the wear-resistant ceramic part is not machined (namely, the cost is reduced in the pump body manufacturing process).

Description

Technical Field

[0001] This invention relates to the technical field of centrifugal pumps, and more particularly to a wear-resistant ceramic pump body and its manufacturing method. Background Technology

[0002] Slurry pumps are used to transport liquids containing solid particles. Due to the scouring effect of solid particles, the flow parts wear out severely. To improve their service life, the flow parts are often made of wear-resistant materials, such as wear-resistant alloys, wear-resistant rubber, and wear-resistant ceramics. Among them, wear-resistant ceramics have the best wear resistance.

[0003] Slurry pumps made of wear-resistant ceramics have flow-through components including the pump body, impeller, and liner plates. The pump body and liner plates are sealed using a hole and shaft fit. Typically, the hole is located on the pump body, and the shaft is mounted on the front or rear liner plate. A sealing ring is placed on the outside of the mating shaft and hole to achieve a seal. To ensure sealing effectiveness and reliability, the dimensions of the mating shaft and hole must meet certain precision requirements to prevent wear on the sealing ring. A common method is to machine the shaft or hole to achieve the designed dimensional accuracy.

[0004] Slurry pumps made of wear-resistant ceramics have flow-through components including the pump body, impeller, and liner plates. The pump body and liner plates are sealed using a hole and shaft fit. Typically, the hole is located on the pump body, and the shaft is mounted on the front or rear liner plate. A sealing ring is placed on the outside of the mating shaft and hole to achieve a seal. To ensure sealing effectiveness and reliability, the dimensions of the mating shaft and hole must meet certain precision requirements to prevent wear on the sealing ring. A common method is to machine the shaft or hole to achieve the designed dimensional accuracy.

[0005] However, due to the extremely high hardness of ceramics, processing is very difficult, resulting in high costs. To solve this problem, CN211343486U discloses a ceramic pump body. This technical solution involves sintering holes on the ceramic pump body to a size larger than the theoretical size, then applying a composite wear-resistant material to the inner surface and axial outer side of the hole to eliminate the need for machining, and finally applying a seal to the outer side of the composite wear-resistant material to achieve a seal. This solution can meet the requirements for lifespan and reliability in most application scenarios, and the cost is significantly lower than that of machining methods. However, under conditions of severe abrasion, due to the insufficient wear resistance of the composite wear-resistant material, the composite wear-resistant material on the surface of the pump body mating hole is easily worn, further wearing down the composite wear-resistant material on the axial outer side of the hole, leading to damage to the outer sealing ring, and ultimately causing the slurry to erode the metal parts of the pump body or the protective plate, causing damage.

[0006] Therefore, existing technologies cannot simultaneously meet the requirements of reducing costs and increasing service life during the manufacturing process of pump bodies under conditions of strong abrasion. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wear-resistant ceramic pump body and its manufacturing method. This wear-resistant ceramic pump body can simultaneously meet the requirements of reducing costs and increasing service life during the pump body manufacturing process under strong abrasive conditions.

[0008] To achieve the above objectives, the technical solution provided by this invention is as follows: A wear-resistant ceramic pump body includes a housing, a ceramic liner, and a first bonding layer for filling a binder between the housing and the ceramic liner, wherein the housing is provided with mating holes that mate with a protective plate. The first bonding layer is provided with a wear-resistant ceramic component near the mating hole; The wear-resistant ceramic part is ring-shaped and is composed of at least three ceramic sub-parts. The surface of the ceramic sub-parts facing the mating hole is adapted to the surface of the corresponding part of the guard plate.

[0009] In this technical solution, by setting wear-resistant ceramic components, the wear resistance of the first bonding layer near the mating hole can be greatly improved. Furthermore, the wear-resistant ceramic component is annular and composed of at least three ceramic sub-components. The surface of the ceramic sub-component facing the mating hole is adapted to the surface of the corresponding part of the guard plate. This allows for a higher degree of fit between the radial inner surface of the wear-resistant ceramic component and the axial surface of the corresponding guard plate without requiring machining of the wear-resistant ceramic component (i.e., reducing costs during pump body manufacturing).

[0010] Furthermore, the wear-resistant ceramic component is located between the outer shell and the ceramic liner, and is connected to the outer shell and the ceramic liner respectively through the first bonding layer, forming an integral whole with the outer shell, the first bonding layer, and the ceramic liner, thereby preventing the wear-resistant ceramic component from falling off and improving the reliability of the wear-resistant ceramic pump body.

[0011] Furthermore, the side of the wear-resistant ceramic part that connects to the first bonding layer is provided with a stress-bearing connection groove; The width of the bottom of the stress-bearing connection groove is greater than the width of the groove opening.

[0012] This technical solution improves the structure of the wear-resistant ceramic parts, thereby enhancing the bond strength between the wear-resistant ceramic parts and the first bonding layer.

[0013] Furthermore, the ceramic liner has a second bonding layer on the side facing the mating hole, which allows it to be fitted with a protective plate without machining the ceramic liner.

[0014] Furthermore, the wear-resistant ceramic component has a third bonding layer on the side facing the mating hole, which can reduce the dimensional accuracy of the ceramic sub-components involved in assembling the wear-resistant ceramic component, thereby reducing the manufacturing cost of the wear-resistant ceramic pump body while meeting the requirements of wear resistance.

[0015] Furthermore, the thickness of the second bonding layer is greater than that of the third bonding layer, which makes the third bonding layer less susceptible to wear, thereby increasing the lifespan of the sealing ring.

[0016] Furthermore, the outer casing is provided with a limiting groove; The wear-resistant ceramic part is provided with a limiting part; The limiting part is embedded in the limiting groove, and the limiting groove limits the wear-resistant ceramic part in the horizontal direction.

[0017] This technical solution, through the cooperation of the limiting groove of the outer shell and the limiting part of the wear-resistant ceramic part, is conducive to the positioning and fixing of the wear-resistant ceramic part during the manufacturing of the pump body. At the same time, it is also conducive to the wear-resistant ceramic part not falling off due to pressure when the sealing ring is installed on its surface.

[0018] Furthermore, the outer surface of the wear-resistant ceramic part away from the mating hole is provided with multiple clamping parts between the limiting groove and the outer surface of the wear-resistant ceramic part away from the mating hole, for pushing the corresponding ceramic sub-parts to move toward the axis.

[0019] In this technical solution, the wear-resistant ceramic part can be positioned by a clamping component during casting, so that the wear-resistant ceramic part can be tightly attached to the molding mold, and the third bonding layer formed after casting has a smaller thickness, which makes the third bonding layer less susceptible to wear, thereby improving the life of the sealing ring.

[0020] Furthermore, the binder contains wear-resistant particles, which can be made of silicon carbide, alumina, etc., to enhance the overall strength of the wear-resistant ceramic pump body while ensuring the adhesiveness of the binder.

[0021] Furthermore, to achieve the above objectives, the present invention also provides a method for manufacturing the aforementioned wear-resistant ceramic pump body, comprising: Separately manufacture the outer shell, ceramic inner lining, and wear-resistant ceramic parts; Assemble the outer shell and the molding die together; Fix the wear-resistant ceramic part to the corresponding part of the shaping mold; Fix the ceramic liner to the corresponding part of the molding die; The first bonding layer between the outer shell and the ceramic liner is filled with a binder; After the binder is cured and the ceramic liner and wear-resistant ceramic parts are fixed, the mold is removed to obtain the wear-resistant ceramic pump body.

[0022] Compared with existing technologies, the principles and advantages of this technical solution are as follows: 1. By incorporating wear-resistant ceramic components, the wear resistance of the first bonding layer near the mating hole can be significantly improved. Furthermore, the wear-resistant ceramic components are annular and composed of at least three ceramic sub-components, allowing for a higher degree of fit between the radial inner surface of the wear-resistant ceramic components and the corresponding shaft surface of the protective plate without requiring machining of the components (i.e., reducing costs during pump body manufacturing).

[0023] 2. The wear-resistant ceramic part is located between the outer shell and the ceramic liner, and is connected to the outer shell and the ceramic liner respectively through the first bonding layer. It forms an integral whole with the outer shell, the first bonding layer and the ceramic liner, which can prevent the wear-resistant ceramic part from falling off and improve the reliability of the wear-resistant ceramic pump body.

[0024] 3. A stress-bearing connection groove is provided on the side of the wear-resistant ceramic part that is connected to the first bonding layer. The width of the bottom of the stress-bearing connection groove is greater than the width of the groove opening. By improving the structure of the wear-resistant ceramic part, the firmness of the connection between the wear-resistant ceramic part and the first bonding layer can be further improved.

[0025] 4. The ceramic liner has a second bonding layer on the side facing the mating hole, which allows it to be fitted with a protective plate without machining the ceramic liner.

[0026] 5. A third bonding layer is provided on the side of the wear-resistant ceramic part facing the mating hole, which can reduce the dimensional accuracy of the ceramic sub-parts involved in assembling the wear-resistant ceramic part, thereby reducing the manufacturing cost of the wear-resistant ceramic pump body while meeting the requirements of wear resistance.

[0027] 6. The matching of the limiting groove of the outer shell and the limiting part of the wear-resistant ceramic part is beneficial to the positioning and fixing of the wear-resistant ceramic part during the manufacturing of the pump body. At the same time, it is also beneficial to prevent the wear-resistant ceramic part from falling off due to pressure when the sealing ring is installed on its surface.

[0028] 7. During casting, clamping components can be used to position the wear-resistant ceramic parts, allowing them to fit tightly against the mold. This results in a thinner third bonding layer after casting, making it less susceptible to wear and thus extending the lifespan of the sealing ring. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of the wear-resistant ceramic pump body described in Embodiment 1 of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a cross-sectional view of the ceramic component in Embodiment 1 of the present invention; Figure 4 This is a perspective view of the ceramic component of Embodiment 1 of the present invention; Figure 5 This is a cross-sectional view of the wear-resistant ceramic pump body and the protective plate after assembly according to Embodiment 1 of the present invention; Figure 6 for Figure 5 A partial view at point B in the middle; Figure 7 This is a schematic diagram illustrating the casting of the wear-resistant ceramic pump body in Example 1; Figure 8 for Figure 7 A partial cross-sectional view at point C in the middle; Figure 9 This is a cross-sectional view of the wear-resistant ceramic pump body in Embodiment 2 of the present invention; Figure 10 for Figure 9 A partial view at point D; Figure 11 This is a cross-sectional view of the ceramic component in Embodiment 2 of the present invention; Figure 12 This is a perspective view of the ceramic component in Embodiment 2 of the present invention; Figure 13 This is a schematic diagram of the casting of the wear-resistant ceramic pump body in Embodiment 2 of the present invention; Figure 14 for Figure 13 A partial view at point E in the middle.

[0031] Figure label: 1-Outer shell, 2-Ceramic inner liner, 3-First bonding layer, 4-Guard plate, 5-Matching hole, 6-Wear-resistant ceramic part, 7-Ceramic sub-part, 8-Force-bearing connection groove, 9-Second bonding layer, 10-Third bonding layer, 11-Limiting groove, 12-Limiting part, 13-Clamping part, 14-Sealing ring, 15-Shaping mold, 16-Gating port. Detailed Implementation

[0032] The present invention will be further described below with reference to two specific embodiments: Example 1

[0033] like Figures 1 to 8As shown in the figure, the wear-resistant ceramic pump body described in this embodiment includes a shell 1, a ceramic liner 2, and a first bonding layer 3 located between the shell 1 and the ceramic liner for filling with a binder (the binder contains wear-resistant particles). The shell 1 is provided with a mating hole 5 that mates with a protective plate 4. The first bonding layer 3 is provided with a wear-resistant ceramic part 6 near the mating hole 5. The wear-resistant ceramic part 6 is annular and is composed of six ceramic sub-parts 7. The surfaces of the six ceramic sub-parts 7 facing the mating hole are adapted to the surfaces of the corresponding parts of the protective plate 4.

[0034] By incorporating wear-resistant ceramic components 6, the wear resistance of the first bonding layer 3 near the mating hole 5 can be significantly improved. Furthermore, the wear-resistant ceramic component 6 is annular, composed of six ceramic sub-components 7, which allows for a higher degree of fit between the radial inner surface of the wear-resistant ceramic component 6 and the corresponding axial surface of the guard plate 4 without requiring machining of the component 6 (i.e., reducing costs during pump body manufacturing). Wear-resistant particles are incorporated into the binder, enhancing the overall strength of the wear-resistant ceramic pump body while maintaining binder viscosity.

[0035] Specifically, in this embodiment, the wear-resistant ceramic part 6 is located between the outer shell 1 and the ceramic inner liner 2, and is connected to the outer shell 1 and the ceramic inner liner 2 respectively through the first bonding layer 3. It forms an integral whole with the outer shell 1, the first bonding layer 3 and the ceramic inner liner 2, thereby preventing the wear-resistant ceramic part 6 from falling off and improving the reliability of the wear-resistant ceramic pump body.

[0036] The distance between the wear-resistant ceramic part 6 and the ceramic inner liner 2 is 5mm. This ensures that the wear-resistant ceramic part 6 and the ceramic inner liner 2 do not interfere with each other during assembly, and also prevents the wear-resistant ceramic part 6 from falling off due to the easy wear of the bonding agent between the wear-resistant ceramic part 6 and the ceramic inner liner 2.

[0037] Specifically, in this embodiment, the side of the wear-resistant ceramic part 6 that is connected to the first bonding layer 3 is provided with a stress-bearing connection groove 8; The width b2 of the bottom of the stress-bearing connection groove 8 is greater than the width b1 of the groove opening. By improving the structure of the wear-resistant ceramic part 6, the firmness of the connection between the wear-resistant ceramic part 6 and the first bonding layer 3 is further improved.

[0038] Specifically, in this embodiment, the ceramic liner 2 has a second bonding layer 9 on the side facing the mating hole 5, allowing it to be fitted with the protective plate 4 without machining the ceramic liner 2. The wear-resistant ceramic part 6 has a third bonding layer 10 on the side facing the mating hole 5, which can reduce the dimensional accuracy of the ceramic sub-parts 7 involved in assembling the wear-resistant ceramic part 6, thereby reducing the manufacturing cost of the wear-resistant ceramic pump body while meeting wear resistance requirements. The thickness of the second bonding layer 9 is greater than the thickness of the third bonding layer 10, making the third bonding layer 10 less prone to wear, thereby increasing the lifespan of the sealing ring 14.

[0039] Obviously, in this embodiment, the first bonding layer 3 can be made of one material or can contain multiple materials to improve its performance or reduce its cost.

[0040] This embodiment also includes a manufacturing method for the above-mentioned wear-resistant ceramic pump body, comprising the following specific steps: S1. Separately manufacture the outer shell 1, the ceramic inner liner 2, and the wear-resistant ceramic part 6; S2. Assemble the outer shell 1 and the molding mold 15 together; S3. Fix the wear-resistant ceramic part 6 to the corresponding part of the shaping mold 15; S4. Fix the ceramic inner liner 2 to the corresponding part of the molding mold 15; S5. The first bonding layer 3 between the outer shell 1 and the ceramic inner liner 2 is filled with a binder; the specific process includes: A binder containing wear-resistant particles is filled between the outer shell 1 and the ceramic inner liner 2 through the pouring port 16; the binder fills the cavity between the outer shell and the ceramic inner liner 2, i.e., the first bonding layer 3; the binder fills the gap between the ceramic inner liner 2 and the mold 15 to form the second bonding layer 9; and the binder fills the gap between the wear-resistant ceramic part 6 and the mold 15 to form the third bonding layer 10.

[0041] S6. After the binder is cured and the ceramic liner 2 and the wear-resistant ceramic part 6 are fixed, the mold 15 is removed to obtain the wear-resistant ceramic pump body. Example 2

[0042] like Figures 9 to 14 As shown, the main difference between this embodiment and Embodiment 1 is that: In this embodiment, the mating hole 5 is a stepped conical hole, and the wear-resistant ceramic part 6 is composed of 24 ceramic sub-parts 7.

[0043] Next, the outer shell 1 is provided with a limiting groove 11; the wear-resistant ceramic part 6 is provided with a limiting part 12; the limiting part 12 is embedded in the limiting groove 11, and the wear-resistant ceramic part 6 is horizontally limited by the limiting groove 11. In this embodiment, the limiting groove 11 of the outer shell 1 and the limiting part 12 of the wear-resistant ceramic part 6 cooperate to facilitate the positioning and fixing of the wear-resistant ceramic part 6 during the manufacturing of the pump body. At the same time, it also helps to prevent the wear-resistant ceramic part 6 from falling off due to pressure when the sealing ring 14 is installed on its surface.

[0044] In addition, in this embodiment, a plurality of clamping members 13 are provided between the outer surface of the wear-resistant ceramic part 6 away from the mating hole 5 and the limiting groove 11 for pushing the corresponding ceramic sub-parts 7 to move toward the axis. The clamping members 13 can be used to position the wear-resistant ceramic part 6 during casting, so that the wear-resistant ceramic part 6 can be tightly attached to the molding mold 15, so that the third bonding layer 10 formed after casting has a smaller thickness, making the third bonding layer less susceptible to wear, thereby improving the life of the sealing ring 14.

[0045] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, any changes made in accordance with the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A wear-resistant ceramic pump body, comprising a housing, a ceramic liner, and a first bonding layer for filling a binder between the housing and the ceramic liner, characterized in that, The outer casing is provided with mating holes that mate with the protective plate; The first bonding layer is provided with a wear-resistant ceramic component near the mating hole; The wear-resistant ceramic part is ring-shaped and is composed of at least three ceramic sub-parts. The surface of the ceramic sub-parts facing the mating hole is adapted to the surface of the corresponding part of the guard plate.

2. The wear-resistant ceramic pump body according to claim 1, characterized in that, The wear-resistant ceramic component is located between the outer shell and the ceramic liner, and is connected to the outer shell and the ceramic liner respectively through the first bonding layer, forming a whole with the outer shell, the first bonding layer and the ceramic liner.

3. The wear-resistant ceramic pump body according to claim 1, characterized in that, The side of the wear-resistant ceramic part that connects to the first bonding layer is provided with a stress-bearing connection groove. The width of the bottom of the stress-bearing connection groove is greater than the width of the groove opening.

4. The wear-resistant ceramic pump body according to claim 1, characterized in that, The ceramic liner has a second bonding layer on the side facing the mating hole.

5. The wear-resistant ceramic pump body according to claim 4, characterized in that, The wear-resistant ceramic part has a third bonding layer on the side facing the mating hole.

6. The wear-resistant ceramic pump body according to claim 5, characterized in that, The thickness of the second bonding layer is greater than the thickness of the third bonding layer.

7. A wear-resistant ceramic pump body according to any one of claims 1-6, characterized in that, The outer casing is provided with a limiting groove; The wear-resistant ceramic part is provided with a limiting part; The limiting part is embedded in the limiting groove, and the limiting groove limits the wear-resistant ceramic part in the horizontal direction.

8. The wear-resistant ceramic pump body according to claim 7, characterized in that, The wear-resistant ceramic part has multiple clamping parts between its outer surface away from the mating hole and the limiting groove, which are used to push the corresponding ceramic sub-parts to move toward the axis.

9. A wear-resistant ceramic pump body according to any one of claims 1-6, characterized in that, The binder contains wear-resistant particles.

10. A method for manufacturing the wear-resistant ceramic pump body of claim 1, characterized in that, include: Separately manufacture the outer shell, ceramic inner lining, and wear-resistant ceramic parts; Assemble the outer shell and the molding die together; Fix the wear-resistant ceramic part to the corresponding part of the shaping mold; Fix the ceramic liner to the corresponding part of the molding die; The first bonding layer between the outer shell and the ceramic liner is filled with a binder; After the binder is cured and the ceramic liner and wear-resistant ceramic parts are fixed, the mold is removed to obtain the wear-resistant ceramic pump body.

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