Composite ceramic rear protective plate for desulfurization pump

Abstract

The utility model discloses a composite ceramic rear guard plate for a desulfurization pump, which belongs to the technical field of desulfurization pumps and comprises a rear guard plate metal framework, and a rear guard plate composite ceramic layer is arranged on the inner surface of the rear guard plate metal framework. Through the arrangement of the rear protection plate metal framework and the rear protection plate composite ceramic layer, due to the fact that the machinability of a mechanical seal matching cavity needs to be considered, part of the surface of the metal framework needs to be in contact with slurry, a high-chromium material is adopted, the corrosion resistance is good even if the surface of the metal framework is in contact with the slurry, and composite ceramic is a silicon carbide and molecular composite material; an integral casting molding process is adopted, firmness of combination with the metal framework is guaranteed, corrosion resistance and abrasion resistance of the whole part are also guaranteed, and in order to further enhance reliability of combination of the composite ceramic layer and the metal framework and prevent falling off caused by inconsistent deformation rates of different materials, the service life of the composite ceramic layer and the metal framework is prolonged. And dovetail anti-falling structures are designed in the radial direction and the axial direction of the metal framework, so that the risk that the ceramic layer of the part falls off is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of desulfurization pump technology, specifically relating to a composite ceramic rear guard plate for desulfurization pumps. Background Technology

[0002] A desulfurization pump is a high-flow, low-head centrifugal pump typically used in the desulfurization process of power plant absorption towers. It delivers limestone-gypsum slurry to spray nozzles at different heights to complete flue gas desulfurization. The mainstream approach in the market is to use all-metal pumps to transport the limestone slurry. This slurry is acidic, with a pH of 4-6, and contains a large amount of Cl- ions, generally below 40,000 ppm, with a specific gravity of around 1.2. Despite using high-chromium alloy metals, the lifespan of the components is limited due to the inherent properties of the metal itself, resulting in strong corrosion and wear. Utility Model Content

[0003] The purpose of this utility model is to provide a composite ceramic rear guard plate for desulfurization pumps, which aims to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A composite ceramic rear guard plate for a desulfurization pump includes a rear guard plate metal frame, wherein a rear guard plate composite ceramic layer is disposed on the inner surface of the rear guard plate metal frame.

[0006] The rear guard plate metal frame is provided with a first dovetail groove anti-detachment structure in the radial direction;

[0007] The rear guard plate metal frame is provided with a second dovetail groove anti-detachment structure in the axial direction.

[0008] As a preferred embodiment of this utility model, the rear guard plate metal frame is made of high-chromium material.

[0009] As a preferred embodiment of this utility model, the composite ceramic layer of the rear guard plate is formed by casting silicon carbide.

[0010] As a preferred embodiment of this utility model, the rear guard plate metal frame is provided with a second threaded hole on the circumferential end face. The second threaded hole facilitates lifting and prevents the ceramic from being bumped or knocked.

[0011] As a preferred embodiment of this utility model, the rear guard plate metal frame is provided with a first threaded hole on the left end face, and the first threaded hole is connected to the suspension body by bolts.

[0012] In a preferred embodiment of this utility model, a 0.2mm gap is left between the composite ceramic layer of the rear guard plate and the composite ceramic layer of the volute, and the first sealing is completed by a rubber sealing ring.

[0013] As a preferred embodiment of this utility model, the rear guard plate metal frame achieves a second seal between the rear guard plate metal frame and the volute metal frame through the compression action of the suspension body.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting the rear guard plate metal skeleton and the rear guard plate composite ceramic layer, because the machinability of the mechanical seal cavity needs to be considered, some surfaces of the metal skeleton need to come into contact with the slurry. Therefore, a high-chromium material is used, which has good corrosion resistance even when in contact with the slurry. The composite ceramic is a "silicon carbide and molecular composite material" and is made by integral casting process, which not only ensures the firmness of the bond with the metal skeleton, but also ensures the overall corrosion resistance and wear resistance of the parts. In order to further enhance the reliability of the bond between the composite ceramic layer and the metal skeleton and prevent detachment due to the inconsistent deformation rate of different materials, dovetail anti-detachment structures are designed in the radial and axial directions of the metal skeleton, which greatly reduces the risk of the ceramic layer of the parts falling off.

[0015] Because of the use of casting composite ceramic molding technology, the technical problem of low crack toughness of silicon carbide ceramic materials in the existing technology, which makes them prone to brittle fracture and affects the reliability of ceramic back guard plates, is effectively solved. This extends the service life of composite ceramic back guard plates and reduces maintenance costs.

[0016] Thanks to the use of radial and axial dovetail anti-detachment structures, this two-way fixing method can effectively solve the problem of ceramic liners on parts easily falling off.

[0017] The rear guard plate metal frame has threaded holes on its circumferential end face, which facilitates lifting after the lifting rings are installed and prevents the composite ceramic material from being bumped or damaged. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Fig. 1 This is a schematic diagram of the assembly structure of the composite ceramic rear guard plate of this utility model;

[0020] Fig. 2 This is a schematic diagram of the composite ceramic rear guard plate component of this utility model.

[0021] In the diagram: 1. Rear guard plate metal frame; 11. Rear guard plate composite ceramic layer; 12. First dovetail groove anti-detachment structure; 13. Second dovetail groove anti-detachment structure; 14. First threaded hole; 15. Second threaded hole; 2. Suspension body; 21. Bolt; 3. Volute housing metal frame; 31. Volute housing composite ceramic layer; 32. Rubber sealing ring. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] Example

[0026] Reference Figs. 1-2 This is the first embodiment of the present utility model. This embodiment provides a composite ceramic rear guard plate for a desulfurization pump, including a rear guard plate metal frame 1, and a rear guard plate composite ceramic layer 11 is provided on the inner surface of the rear guard plate metal frame 1.

[0027] The rear guard plate metal frame 1 is provided with a first dovetail groove anti-detachment structure 12 in the radial direction;

[0028] The rear guard plate metal frame 1 is provided with a second dovetail groove anti-detachment structure 13 in the axial direction;

[0029] Specifically, the rear guard plate metal frame 1 is made of high chromium material;

[0030] Furthermore, the composite ceramic layer 11 of the rear guard plate is formed by casting silicon carbide.

[0031] Preferably, the rear guard plate metal frame 1 has a second threaded hole 15 on its circumferential end face;

[0032] It should be noted that the rear guard plate metal frame 1 has a first threaded hole 14 on the left end face, and the first threaded hole 14 is connected to the suspension body 2 by bolt 21;

[0033] A 0.2mm gap is left between the rear guard plate composite ceramic layer 11 and the volute composite ceramic layer 31, and the first seal is completed by the rubber sealing ring 32;

[0034] The rear guard plate metal frame 1 is compressed by the suspension body 2, and the second seal between the rear guard plate metal frame 1 and the volute metal frame 3 is completed.

[0035] In use, the rear guard plate metal frame 1 and the rear guard plate composite ceramic layer 11 attached to the inner wall of the metal frame are combined. The rear guard plate metal frame 1 is made of metal with high chromium content, which can provide pressure protection and resist the corrosion of slurry. The thickness of the rear guard plate metal frame 1 is 66% of that of the traditional metal rear guard plate. Combined with the thickness of the rear guard plate composite ceramic layer 11, the total thickness is 1.7 times that of the traditional metal rear guard plate. Since the composite ceramic has a low density, the total weight remains basically unchanged. The part that mainly contacts the slurry is made of composite ceramic material. By utilizing its superior corrosion and abrasion resistance compared to metal materials, the service life of the rear guard plate is greatly extended.

[0036] In summary, by setting up the rear guard plate metal skeleton 1 and the rear guard plate composite ceramic layer 11, the surface of the metal skeleton needs to come into contact with the slurry due to the need to consider the machinability of the mechanical seal cavity. Therefore, a high-chromium material is used, which has good corrosion resistance even when in contact with the slurry. The composite ceramic is a "silicon carbide and molecular composite material" and is made by integral casting process, which not only ensures the firmness of the bond with the metal skeleton, but also ensures the overall corrosion resistance and wear resistance of the parts. In order to further enhance the reliability of the bond between the composite ceramic layer and the metal skeleton and prevent detachment due to the inconsistent deformation rate of different materials, dovetail anti-detachment structures are designed in the radial and axial directions of the metal skeleton, which greatly reduces the risk of the ceramic layer of the parts falling off.

[0037] Because of the use of casting composite ceramic molding technology, the technical problem of low crack toughness of silicon carbide ceramic materials in the existing technology, which makes them prone to brittle fracture and affects the reliability of ceramic back plate is effectively solved, thereby extending the service life of composite ceramic back plate and reducing maintenance costs.

[0038] Thanks to the adoption of radial and axial dovetail anti-detachment structures, this two-way fixing method can effectively solve the problem of ceramic liners on parts easily falling off.

[0039] The rear guard plate metal frame 1 has a second threaded hole 15 on the circumferential end face. After the lifting ring is installed, it is easy to lift and prevent the composite ceramic material from being bumped.

[0040] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0041] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0042] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A composite ceramic rear guard plate for a desulfurization pump, characterized in that: It includes a rear guard plate metal frame (1), and the inner surface of the rear guard plate metal frame (1) is provided with a rear guard plate composite ceramic layer (11); The rear guard plate metal frame (1) is provided with a first dovetail groove anti-detachment structure (12) in the radial direction; The rear guard plate metal frame (1) is provided with a second dovetail groove anti-detachment structure (13) in the axial direction.

2. The composite ceramic rear guard plate for a desulfurization pump according to claim 1, characterized in that: The rear guard plate metal frame (1) is made of high chromium material.

3. The composite ceramic rear guard plate for a desulfurization pump according to claim 2, characterized in that: The rear protective plate composite ceramic layer (11) is formed by casting silicon carbide.

4. The composite ceramic rear guard plate for a desulfurization pump according to claim 3, characterized in that: The rear guard metal frame (1) has a second threaded hole (15) on its circumferential end face.

5. The composite ceramic rear guard plate for a desulfurization pump according to claim 4, characterized in that: The rear guard metal frame (1) has a first threaded hole (14) on its left end face, and the first threaded hole (14) is connected to the suspension body (2) by a bolt (21).

6. The composite ceramic rear guard plate for a desulfurization pump according to claim 5, characterized in that: A 0.2mm gap is left between the rear guard plate composite ceramic layer (11) and the volute composite ceramic layer (31), and the first seal is completed by the rubber sealing ring (32).

7. A composite ceramic rear guard plate for a desulfurization pump according to claim 6, characterized in that: The rear guard metal frame (1) achieves a second seal between the rear guard metal frame (1) and the volute metal frame (3) through the compression action of the suspension body (2).

Images