Impact-resistant composite ceramic impeller for heavy slurry pump and manufacturing method of impact-resistant composite ceramic impeller

Abstract

The impact-resistant composite ceramic impeller for the heavy slurry pump comprises a ceramic framework and a metal framework, the ceramic framework comprises a front ceramic ring, a rear ceramic disc and a plurality of ceramic blades arranged between the front ceramic ring and the rear ceramic disc in the circumferential direction at intervals, and a metal blade cavity is reserved in an inner cavity of each ceramic blade; a ceramic boss structure protruding towards the middle of the front ceramic ring is arranged in the middle of the rear ceramic disc, and the metal framework comprises a front metal ring, a rear metal ring, a plurality of metal blades arranged between the front metal ring and the rear metal ring at intervals in the circumferential direction and a metal hub arranged in the middle of the rear metal ring. The side, facing the middle of the front metal ring, of the metal hub protrudes to form a metal boss, the metal boss is of a honeycomb structure, the side, away from the middle of the front metal ring, of the metal hub is provided with a shaft connecting section, the metal blades are inserted into metal blade cavities, the honeycomb structure is filled with a reinforcing layer, and gaps between the ceramic framework and the metal framework are fixedly connected through a bonding layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid equipment, in particular to an anti-impact composite ceramic impeller for heavy slurry pump and a manufacturing method thereof. BACKGROUND

[0002] The heavy slurry pump is suitable for conveying solid particles with corrosion resistance and slurry with corrosion resistance, such as conveying of mine slurry in a metallurgical concentrator, conveying of ash in a power plant, conveying of coal slurry and conveying of heavy medium, etc. The impeller is a core component of the heavy slurry pump. Using reaction sintered silicon carbide ceramic as the surface contact material of the impeller is an important method to improve the corrosion resistance and corrosion resistance of the impeller, which can effectively improve the service life of the impeller.

[0003] When conveying slurry particles with a diameter greater than 8mm, the diameter of the impeller is generally greater than 500mm. The existing silicon carbide ceramic impeller has the problems of poor impact resistance and easy to burst under high pressure due to its brittleness, especially the hub position of the existing silicon carbide ceramic impeller is easy to burst. In addition, the bonding effect between the silicon carbide ceramic material and other materials is poor, and the service life of the impeller is short. Therefore, a special anti-impact composite ceramic impeller for heavy slurry pump and a manufacturing method thereof are needed to meet the long-term conveying needs of slurry particles with a diameter greater than 8mm. SUMMARY

[0004] The present application aims to solve the above problems by providing an anti-impact composite ceramic impeller for heavy slurry pump and a manufacturing method thereof.

[0005] The technical problems solved by the present application can be solved by the following technical solutions: An anti-impact composite ceramic impeller for heavy slurry pump, comprising a ceramic framework and a metal framework, the ceramic framework comprises a front ceramic ring, a rear ceramic disc and a plurality of ceramic blades arranged in a circumferential direction and spaced between the front ceramic ring and the rear ceramic disc, a metal blade cavity is left in the inner cavity of each ceramic blade, the middle part of the rear ceramic disc is provided as a ceramic boss structure protruding towards the middle part of the front ceramic ring, the metal framework comprises a front metal ring, a rear metal ring, a plurality of metal blades arranged in a circumferential direction and spaced between the front metal ring and the rear metal ring, and a metal hub provided in the middle part of the rear metal ring, the side of the metal hub facing the middle part of the front metal ring protrudes to form a metal boss, the metal boss is in a honeycomb structure, the side of the metal hub away from the middle part of the front metal ring is provided as a shaft connecting section, the metal blades are inserted into the metal blade cavities, the front metal ring and the rear metal ring are respectively arranged on the outward sides of the front ceramic ring and the rear ceramic disc, the honeycomb structure is filled with a reinforcing layer, and the gap between the ceramic framework and the metal framework is fixedly connected through an adhesive layer.

[0006] In a preferred embodiment of the present application, the surface of the metal framework is provided with a plurality of through holes.

[0007] In a preferred embodiment of the present application, the surface of the front metal ring and the rear metal ring is provided with a plurality of positioning holes, the surface of the front ceramic ring and the rear ceramic disc is provided with a plurality of positioning bosses matched with the positioning holes, and the positioning holes serve as pouring holes.

[0008] In a preferred embodiment of the present application, the reinforcing layer comprises a rubber layer or a resin layer.

[0009] In a preferred embodiment of the present application, the adhesive layer comprises a resin adhesive layer.

[0010] In a preferred embodiment of the present application, the metal blade is inserted into the front metal ring and / or the rear metal ring.

[0011] In a preferred embodiment of the present application, the outer surface of the front ceramic ring is provided with a front cover plate.

[0012] In a preferred embodiment of the present application, the outer surface of the rear ceramic disc is provided with a rear cover plate.

[0013] In a preferred embodiment of the present application, the ceramic framework comprises a reaction sintered silicon carbide ceramic framework.

[0014] A manufacturing method of the impact-resistant composite ceramic impeller for heavy-duty slurry pumps according to any one of the technical solutions above, comprising the following steps: (1) manufacturing a ceramic framework and processing a metal framework; (2) filling a reinforcing layer in the honeycomb structure; (3) inserting the metal blade of the metal framework into the metal blade cavity, fixing the front metal ring and the rear metal ring on the outward side of the front ceramic ring and the rear ceramic disc respectively, and fixing the metal framework and the ceramic framework through a tool clamp; (4) pouring resin adhesive into the gap between the ceramic framework and the metal framework, forming a complex three-dimensional adhesive layer structure, and after curing and forming at room temperature, forming an integrated impact-resistant composite ceramic impeller for heavy-duty slurry pumps; (5) fixing the front cover plate and the rear cover plate on the outer surface of the front ceramic ring and the outer surface of the rear ceramic disc respectively.

[0015] Due to the adoption of the above technical solutions, the present application has the following technical effects: The metal framework is easy to process and has good mechanical properties, the metal framework forms a complex three-dimensional structure in the shape of a I-shaped section, the metal framework is inlaid in the interior of the ceramic framework, and the overall impact resistance of the impact-resistant composite ceramic impeller for a heavy-duty slag slurry pump is effectively improved, the metal framework is suitable for long-term conveying of slurry particles with a diameter greater than 8 mm; and the metal boss has a honeycomb structure, the honeycomb structure is filled with a reinforcing layer, and the ceramic boss structure is combined with each other, so that the burst problem at the hub position is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 is one of the structural schematic diagrams of an embodiment of the present application.

[0018] Figure 2 is another structural schematic diagram of an embodiment of the present application.

[0019] Figure 3 is one of the structural exploded views of an embodiment of the present application.

[0020] Figure 4 is another structural exploded view of an embodiment of the present application.

[0021] Figure 5 is a sectional view of an embodiment of the present application.

[0022] The drawings are as follows: ceramic framework 100; front ceramic ring 110; first positioning boss 111; rear ceramic disc 120; second positioning boss 121; ceramic boss structure 122; ceramic blade 130; metal blade cavity 131; metal framework 200; through hole 201; front metal ring 210; first positioning hole 211; rear metal ring 220; second positioning hole 221; insertion slot 222; a plurality of metal blades 230; metal hub 240; metal boss 241; shaft connecting section 242; internal thread section 242a; reinforcing layer 250; adhesive layer 300; front cover plate 400; front back blade 410; rear cover plate 500; rear back blade 510. DETAILED DESCRIPTION

[0023] Preferred embodiments of the present application will be described in greater detail below, with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0024] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] It is to be understood that, although the terms "first", "second", "third", and the like can be used herein to describe various information, these terms are not intended to denote a limitation, unless otherwise noted. These terms are simply used to distinguish one general category of information from another, for instance. For example, a first information can also be referred to as a second information, and similarly, a second information can also be referred to as a first information, without departing from the scope of the present application. As such, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0026] Referring to Figures 1 to 5 The impact-resistant composite ceramic impeller for heavy-duty slurry pumps shown in the figure includes a ceramic framework 100 and a metal framework 200. The ceramic framework 100 includes a front ceramic ring 110, a rear ceramic disc 120, and a plurality of ceramic blades 130 arranged in a circumferential direction and spaced between the front ceramic ring 110 and the rear ceramic disc 120. The inner cavity of each ceramic blade 130 is left with a metal blade cavity 131. The middle part of the rear ceramic disc 120 is provided as a ceramic boss structure 122 protruding to the middle part of the front ceramic ring. The ceramic boss structure 122 is in the shape of a frustum. The ceramic framework 100 in the embodiment includes a reaction sintered silicon carbide ceramic framework, which can be prepared in advance using existing devices.

[0027] The metal framework 200 comprises a front metal ring 210, a rear metal ring 220, a plurality of metal blades 230 and a metal hub 240. The plurality of metal blades 230 are arranged in a circumferential direction between the front metal ring 210 and the rear metal ring 220. The metal hub 240 is arranged in the middle of the rear metal ring 220. Preferably, the metal blades 230 are insertedly connected with the front metal ring 210 and / or the rear metal ring 220. In the embodiment, the metal blades 230 are fixedly connected with the front metal ring 210. The rear metal ring 220 is provided with a plurality of insertion grooves 222 matched with the metal blades 230. The metal hub 240 is connected with the rear metal ring 220 by means of a pin and welding. The metal hub 240 is protruded on the side facing the middle of the front metal ring 210 to form a metal boss 241. The metal boss 241 is in a honeycomb structure. The side of the metal hub 240 away from the middle of the front metal ring 210 is provided as a shaft connecting segment 242. The metal framework 200 in the embodiment is made of stainless steel. The shaft connecting segment 242 is provided with an internal thread segment 242a for facilitating connection with a shaft.

[0028] The metal blades 230 are inserted into the metal blade cavities 131. The front metal ring 210 and the rear metal ring 220 are arranged on the sides of the front ceramic ring 110 and the rear ceramic disc 120 facing outward. The honeycomb structure is filled with a reinforcing layer 250. The reinforcing layer 250 comprises a rubber layer or a resin layer, which can increase the strength of the honeycomb structure. The gap between the ceramic framework 100 and the metal framework 200 is fixedly connected by means of the adhesive layer 300. The front metal ring 210, the rear metal ring 220 and the metal blades 230 form a complex three-dimensional structure in the shape of an I-beam. The metal framework 200 is inlaid in the interior of the ceramic framework 100, effectively improving the reinforcing effect of the metal framework 200 on the ceramic framework 100, thereby significantly improving the impact resistance of the whole invention, which is suitable for long-term conveying of slurry particles with a diameter greater than 8 mm.

[0029] In order to enhance the bonding stability between the ceramic framework 100 and the metal framework 200, a plurality of through holes 201 are arranged on the surface of the metal framework 200. The adhesive layer 300 can pass through the through holes 201, which can increase the bonding force between the ceramic framework 100 and the metal framework 200 when the adhesive layer 300 is formed. The adhesive layer 300 can be a resin adhesive layer.

[0030] In the embodiment, a plurality of first positioning holes 211 and second positioning holes 221 are arranged on the surfaces of the front metal ring 210 and the rear metal ring 220, respectively. A plurality of first positioning bosses 111 and second positioning bosses 121 matched with the first positioning holes 211 and the second positioning holes 221 are arranged on the surfaces of the front ceramic ring 110 and the rear ceramic disc 120. The first positioning holes 211 and the second positioning holes 221 serve as pouring holes. The diameters of the first positioning holes 211 and the second positioning holes 221 are 50-80 mm.

[0031] The outer surface of the front ceramic ring 110 is provided with a front cover plate 400, and the outer surface of the rear ceramic disc 120 is provided with a rear cover plate 500. The front cover plate 400 and the rear cover plate 500 are fixed on the front ceramic ring 110 and the rear ceramic disc 120 respectively by an adhesive. A plurality of front back vanes 410 and rear back vanes 510 are axially spaced apart on the front cover plate 400 and the rear cover plate 500 respectively, which balance the axial force. The front cover plate 400 and the rear cover plate 500 are made of the same material as the ceramic framework 100.

[0032] A manufacturing method of an anti-impact composite ceramic impeller for a heavy-duty slurry pump, comprising the following steps: (1) manufacturing a ceramic framework 100 and processing a metal framework 200; (2) filling a reinforcing layer 250 in the honeycomb structure; (3) inserting the metal blades 230 of the metal framework 200 into the metal blade cavities 131, and fixing the front metal cover plate 210 and the rear metal ring 220 on the outer sides of the front ceramic ring 110 and the rear ceramic disc 120 respectively, and fixing the metal framework 200 and the ceramic framework 100 by a tool clamp; (4) pouring the resin adhesive into the gap between the ceramic framework 100 and the metal framework 200 through the first positioning hole 211 and the second positioning hole 221 (i.e. the pouring hole), and forming a complex three-dimensional adhesive layer structure, which enhances the resin adhesive strength of the structure filling of the ceramic framework 100 and the metal framework 200, improves the anti-impact performance of the anti-impact composite ceramic impeller for a heavy-duty slurry pump, improves the lateral force of the resin on the metal framework 200, improves the adhesive strength between the ceramic framework 100 and the metal framework 200, prolongs the service life of the product, and forms an integrated anti-impact composite ceramic impeller for a heavy-duty slurry pump after solidification at room temperature; (5) fixing the front cover plate 400 and the rear cover plate 500 on the outer surface of the front ceramic ring and the outer surface of the rear ceramic disc respectively.

[0033] The metal framework 200 is easy to process and has good mechanical properties. The metal framework 200 forms a complex three-dimensional structure in the shape of an I-beam, is embedded in the interior of the ceramic framework 100, effectively improves the anti-impact performance of the anti-impact composite ceramic impeller for a heavy-duty slurry pump as a whole, and is suitable for long-term conveying of slurry particles with a diameter greater than 8 mm. Moreover, the metal boss 241 is in a honeycomb structure, the reinforcing layer 250 is filled in the honeycomb structure, and the ceramic boss structure 122 is combined with each other, thereby avoiding the problem of burst at the hub position.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant composite ceramic impeller for heavy-duty slurry pumps, comprising a ceramic frame and a metal frame, characterized in that, The ceramic skeleton includes a front ceramic ring, a rear ceramic disk, and several ceramic blades circumferentially spaced between the front and rear ceramic rings. Each ceramic blade has a metal blade cavity inside. The center of the rear ceramic disk is configured as a ceramic boss structure protruding towards the center of the front ceramic ring. The metal skeleton includes a front metal ring, a rear metal ring, several metal blades circumferentially spaced between the front and rear metal rings, and a metal hub located in the center of the rear metal ring. The side of the metal hub facing the center of the front metal ring protrudes to form a metal boss, which has a honeycomb structure. The side of the metal hub away from the center of the front metal ring is configured as a shaft connection section. The metal blades are inserted into the metal blade cavities. The front and rear metal rings are respectively located on the outward-facing sides of the front ceramic ring and the rear ceramic disk. The honeycomb structure is filled with a reinforcing layer. The gap between the ceramic skeleton and the metal skeleton is fixedly connected by an adhesive layer.

2. The impact-resistant composite ceramic impeller for heavy-duty slurry pumps according to claim 1, characterized in that, The surface of the metal frame is provided with several through holes at intervals.

3. The impact-resistant composite ceramic impeller for heavy-duty slurry pumps according to claim 1, characterized in that, The surfaces of the front metal ring and the rear metal ring are provided with a plurality of positioning holes spaced apart. The surfaces of the front ceramic ring and the rear ceramic disc are provided with a plurality of positioning bosses that mate with the positioning holes spaced apart. The positioning holes also serve as casting holes.

4. The impact-resistant composite ceramic impeller for heavy-duty slurry pumps according to claim 1, characterized in that, The reinforcing layer includes a rubber layer or a resin layer.

5. The impact-resistant composite ceramic impeller for a heavy-duty slurry pump according to claim 1, characterized in that, The adhesive layer includes a resin adhesive layer.

6. The impact-resistant composite ceramic impeller for a heavy-duty slurry pump according to claim 1, characterized in that, The metal blade is inserted into and fitted with the front metal ring and / or the rear metal ring.

7. The impact-resistant composite ceramic impeller for heavy-duty slurry pumps according to claim 1, characterized in that, A front cover plate is provided on the outer surface of the front ceramic ring.

8. The impact-resistant composite ceramic impeller for a heavy-duty slurry pump according to claim 1, characterized in that, The outer surface of the rear ceramic disc is provided with a rear cover plate.

9. The impact-resistant composite ceramic impeller for a heavy-duty slurry pump according to claim 1, characterized in that, The ceramic framework includes a reaction-sintered silicon carbide ceramic framework.

10. A method for manufacturing an impact-resistant composite ceramic impeller for a heavy-duty slurry pump as described in any one of claims 1-9, characterized in that, Includes the following steps: (1) Manufacturing ceramic skeletons and processing them to form metal skeletons; (2) The honeycomb structure is filled with a reinforcing layer; (3) Insert the metal blade of the metal skeleton into the metal blade cavity, and fix the front metal ring and the rear metal ring to the outward side of the front ceramic ring and the rear ceramic disk respectively. The metal skeleton and the ceramic skeleton are fixed by tooling fixtures. (4) The resin adhesive is poured into the gap between the ceramic skeleton and the metal skeleton. The resin adhesive forms a complex three-dimensional adhesive layer structure. After curing at room temperature, it forms an integrated heavy-duty slurry pump impact-resistant composite ceramic impeller. (5) Fix the front cover plate and the rear cover plate to the outer surface of the front ceramic ring and the outer surface of the rear ceramic disc, respectively.

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