Wear-resistant ceramic composite metal slurry pump for mineral separation

Abstract

The utility model discloses a wear-resistant ceramic composite metal slurry pump for mineral separation. The slurry pump comprises a bracket, a bearing assembly, a stuffing box, a pump shell and an overflowing piece. The overflowing piece comprises a front protective plate, a rear protective plate, a protective sleeve and an impeller; the front protective plate, the rear protective plate, the protective sleeve and the impeller are each of a structure that a ceramic block is fixedly arranged on a metal framework. The ceramic block is fixedly arranged on the metal framework in an easy-to-wear area of the overflowing piece; the sheath comprises a sheath ceramic block and a sheath metal shell, and the sheath ceramic block is fixed in the sheath metal shell; and the sheath ceramic blocks are divided into one or more pieces along the circumferential direction of the sheath metal shell and cover an overflowing surface or an easy-to-wear area in the sheath.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal slurry pumps and wear-resistant ceramics for ore dressing, and relates to a wear-resistant ceramic composite metal sheath and a slurry pump. Background Art

[0002] The flow parts of the existing all-ceramic slurry pumps in the prior art only include a pure ceramic layer. The integrated design of the pure ceramic flow parts may increase the complexity of the assembly process, especially when it is necessary to combine with other metal parts of the pump, it may be more difficult to ensure accurate alignment; when the pump is maintained or the flow parts need to be replaced, the pure ceramic structure may cause the entire module to be replaced instead of replacing or repairing a locally damaged part, which may lead to increased maintenance costs and time; the pure ceramic flow parts may limit the flexibility of the design. For example, when the shape or size of the flow channel needs to be optimized to improve the efficiency of the pump, the difficulty of ceramic processing may limit the adjustment of these structural details; the pure ceramic structure may fix a specific flow channel shape and size at the beginning of the design, which may limit the ability to adjust or optimize the pump performance later, especially when the pump needs to adapt to different working conditions; in addition, the pure ceramic flow parts may be limited in size and shape because it needs to maintain sufficient structural strength and stability as a whole, which may limit the pursuit of flow channel optimization during design.

[0003] Compared with all-ceramic sheaths, all-ceramic sheaths cannot be made too large. Although they are easy to shape, they have poor wear resistance and are easy to break. Utility Model Content

[0004] In order to address the deficiencies in the prior art, the purpose of the utility model is to provide a wear-resistant ceramic composite metal sheath and a slurry pump, aiming to solve the problems that the full silicon carbide material flow-through parts of the slurry pump are difficult to enlarge and easy to break, and the design is inflexible. By arranging ceramic blocks on the metal skeleton of the sheath, the sheath in the slurry pump is wear-resistant, corrosion-resistant, has a long service life, and has low cost.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a wear-resistant ceramic composite metal sheath, wherein the sheath is a detachable structure of front and rear halves or is directly made into an integrated structure, comprising a sheath ceramic block and a sheath metal shell, wherein the sheath ceramic block is fixed inside the sheath metal shell; specifically, the sheath ceramic block is divided into one or more along the circumferential direction of the sheath metal shell, covering the entire internal flow surface of the metal sheath or a local easily worn area, wherein the easily worn area refers to an area where the fluid linear velocity near the sheath is greater than 20 m / s and / or backflow is generated, such as a tongue area, and the sheath ceramic block is fixed on the sheath metal shell.

[0007] The radial height of the sheath ceramic block does not exceed 300 mm; the outer diameter width of the sheath ceramic block does not exceed 300 mm; and the thickness of the sheath ceramic block ranges from 15 to 30 mm.

[0008] The utility model also provides a wear-resistant ceramic composite metal slurry pump for mineral processing, the slurry pump comprising: a bracket, a bearing assembly, a stuffing box, a pump casing, and a flow-through piece; the flow-through piece comprises a front guard plate, a rear guard plate, the above-mentioned sleeve, and an impeller, the front guard plate, the rear guard plate, the sleeve, and the impeller all adopt a structure in which a ceramic block is fixedly arranged on a metal frame, so as to improve the wear resistance and corrosion resistance of the easily worn area on the flow-through piece; the ceramic block is fixedly arranged on the metal frame of the easily worn area of ​​the flow-through piece; the easily worn area refers to the area where the fluid linear velocity near the flow-through piece is greater than 20m / s and / or backflow occurs.

[0009] The bracket is the basic supporting structure of the slurry pump, which is used to fix and carry the bearing assembly, pump shaft and other important components, etc., to ensure the stability and balance of the slurry pump during operation;

[0010] The bearing assembly is mounted on the bracket and includes an axial bearing and a radial bearing, which are used to support and guide the rotation of the pump shaft and bear the axial force and radial force transmitted by the impeller;

[0011] The stuffing box is located at one end or both ends of the pump shaft, and has a built-in stuffing seal and / or other forms of shaft sealing devices, which are used to prevent the slurry in the slurry pump from leaking outward along the axial direction, maintain the working efficiency of the slurry pump and prevent environmental pollution;

[0012] The pump casing is the main structure of the slurry pump, which is usually composed of upper and lower halves, or front and rear halves, connected by bolts, and contains components including flow-through parts and / or other wear-resistant bushings, connected to the bracket to form a complete slurry conveying channel;

[0013] In the flow-through parts,

[0014] The front guard plate is installed in front of the impeller, and cooperates with the inner wall of the pump housing and the sleeve to form a transition flow channel before the slurry enters the impeller, thereby reducing the direct impact and wear of the slurry on the impeller inlet;

[0015] The rear guard plate is installed behind the impeller and cooperates with the inner wall of the pump housing and the sleeve to form a transition channel for the slurry to flow out from the impeller to the outlet section of the pump housing, so that the slurry flowing out of the impeller smoothly transitions to the outlet section of the pump housing, playing an anti-wear and shock-absorbing role;

[0016] The sheath is closely attached to the inner wall of the pump housing to form a spiral flow channel through which the slurry flows, converting the energy generated by the impeller into the static pressure energy of the slurry. The sheath itself has high wear resistance and protects the pump housing from wear.

[0017] The impeller is mounted on the pump shaft and driven to rotate by the motor to pressurize and transport the slurry. The impeller, the front guard plate, the rear guard plate and the jacket form a continuous slurry flow channel.

[0018] The various components of the slurry pump are nested and connected to each other, together forming an efficient and wear-resistant slurry conveying system. The pump shaft runs through the entire pump body, and transmits the power of the motor to the impeller through the bearing assembly. The impeller works in the flow channel formed by the sleeve, and the guard plate plays a role in protecting and guiding the flow of slurry, ensuring that the slurry pump can still maintain good performance and a long service life under long-term high-intensity operating conditions.

[0019] The ceramic block is a wear-resistant ceramic material, including one or more of reaction-sintered silicon carbide ceramics, pressureless-sintered silicon carbide, silicon nitride ceramics or recrystallized ceramics; the density of the ceramic block is not less than 3.03 g / cm 3 , hardness not less than 90HRA; bending strength not less than 350MPa;

[0020] The radial height of the ceramic block does not exceed 300 mm, the outer diameter width does not exceed 300 mm; the thickness ranges from 15 to 30 mm;

[0021] The gaps between the ceramic blocks are filled with adhesive at high pressure to ensure the integrity of the wear surface of the ceramic blocks and prevent the slurry from wearing through the skeleton from the gaps;

[0022] The metal skeleton is made of materials including high chromium alloy, Q235B carbon structural steel or QT500-7 ductile iron.

[0023] In the slurry pump, the front guard plate and the rear guard plate are respectively installed at the front and rear positions of the impeller;

[0024] The front guard plate and / or the rear guard plate both include a guard plate ceramic block and a guard plate metal frame, wherein the guard plate ceramic block is bonded and fixed to the guard plate metal frame by an adhesive; the guard plate metal frame includes an integrated hollow metal cylinder and a flat metal ring fixed to one end of the hollow metal cylinder, the inner ring size of the flat metal ring matches the inner diameter of the hollow metal cylinder, the interior of the hollow metal cylinder corresponds to the flow channel inlet area of ​​the slurry pump, and the lower surface of the flat metal ring corresponds to the guard plate plane area; the guard plate ceramic block is attached to the flow channel inlet area and / or the guard plate plane area, that is, the guard plate ceramic block completely fits and covers the inner surface of the hollow metal cylinder and / or the lower surface of the flat metal ring;

[0025] The guard plate ceramic block covering the inner surface of the hollow metal cylinder is an integrated cylindrical ceramic block; and / or,

[0026] The guard plate ceramic blocks covering the lower surface of the planar metal ring are one or more layers, each layer including a ceramic block group consisting of one or more circles of ceramic blocks; the ceramic block group is divided into one or more circles according to the radial width of the ring on the lower surface of the guard plate; the ceramic block groups of each two adjacent circles are staggered and embedded by setting a step-like structure; each circle of the ceramic block group is divided into one or more in the circumferential direction, and the number of ceramic blocks in the inner and outer circles can be the same or different; the ceramic blocks in the inner and outer circles are mutually nested and fitted in the circumferential direction and the radial direction, and the adjacent two ceramic blocks in each circle are staggered and embedded by setting a step-like structure;

[0027] In a specific embodiment, the protective plate ceramic blocks covering the lower surface of the metal ring are 1-2 layers in the axial direction, which prevents the slurry from wearing through the metal skeleton from the joints and affecting the service life.

[0028] The joints between the inner ring guard plate ceramic blocks and the outer ring guard plate ceramic blocks of the ceramic block group are staggered.

[0029] The guard plate ceramic blocks are mutually nested and fitted in both the circumferential direction and the radial direction.

[0030] The sharp corners of the ceramic blocks of the inner ring guard plate are matched with the impeller inlet, and the matching clearance is controlled at 1-5mm to prevent the slurry from flowing back to the inlet;

[0031] The metal plane of the guard plate and the outermost side of the ceramic block bonded and fixed on the metal plane are wrapped with a sealing ring, that is, the outer side of the guard plate is wrapped with a sealing ring, which can ensure a certain sealing performance when matched with the sleeve.

[0032] The impeller comprises an impeller ceramic block and an impeller metal frame;

[0033] The impeller ceramic block is bonded and fixed to the easily worn area of ​​the impeller; the easily worn area of ​​the impeller includes the impeller suction port, the outer diameter circumference of the front cover plate, the outer diameter circumference of the rear cover plate, and the blade working surface; the corresponding impeller ceramic block includes the impeller suction port ceramic block, the front cover plate outer diameter circumference ceramic block, the rear cover plate outer diameter circumference ceramic block, and the blade working surface ceramic block;

[0034] The impeller metal frame is made of high chromium alloy material.

[0035] In the utility model, different ceramic blocks can be selected with different components according to actual needs, or can be selected with the same components.

[0036] In a specific embodiment, the impeller includes a front cover plate, a rear cover plate and a plurality of blades, the front cover plate and the rear cover plate are arranged opposite to each other, the plurality of blades are arranged between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are connected through the plurality of blades; in the impeller, each blade is in the shape of an arc.

[0037] In the specific implementation process, the ceramic blocks that need to be bonded to the guard plate, the jacket, and the impeller can be provided with grooves of appropriate size and depth on the metal frame, and the ceramic blocks can be bonded and fixed in the grooves.

[0038] In a specific implementation process, a plurality of the grooves are arranged on the inner side surface of the front cover plate facing the rear cover plate, and are arranged at intervals along the circumferential direction of the inner side surface of the front cover plate; and / or,

[0039] The plurality of grooves are arranged on the inner side surface of the rear cover plate facing the front cover plate, and are arranged at intervals along the circumferential direction of the inner side surface of the rear cover plate; and / or,

[0040] A plurality of the grooves are arranged on the inner surface of the impeller suction port; and / or,

[0041] A plurality of grooves are arranged on the working surface of each blade.

[0042] Each of the wear-resistant ceramic blocks is fixedly connected to the impeller body.

[0043] The utility model also provides a method for preparing a composite material of a ceramic block bonded to a metal, the preparation method comprising: applying an adhesive on the surface of the ceramic block, placing the ceramic block on the bonding position of the metal skeleton, placing the metal skeleton bonded with the ceramic block into an oven for curing, setting the temperature to 80-100°C, and drying for 1-2 hours, so as to improve the surface bonding strength between the ceramic and the metal.

[0044] In the utility model, when the ceramic block is partially severely worn, it can be replaced separately, thereby extending the service life and reducing the maintenance cost.

[0045] The beneficial effects of the utility model are as follows: the utility model improves the overall service life of the slurry pump by fixing the divided ceramics on the metal skeleton wear surface of the sheath and other flow-through parts in the slurry pump, and solves the problem that silicon carbide ceramics are difficult to scale up and are brittle by using the solution of fixing the ceramics in blocks according to the wear areas. The ceramic blocks can be replaced individually and the maintenance cost is low, further improving the production efficiency.

[0046] The ceramic composite metal slurry pump provided by the utility model takes advantage of the wear resistance and corrosion resistance of ceramics. The block design solves the problem that silicon carbide ceramics are difficult to scale up and are brittle. The ceramic blocks can be replaced individually and the maintenance cost is low. It is particularly suitable for conveying media containing solid particles and corrosive media in mineral processing, metallurgy, chemical industry, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 The utility model is a structural schematic diagram of a wear-resistant ceramic composite metal slurry pump for mineral processing.

[0049] Figure 2 The utility model is a schematic diagram of the structure of a ceramic composite metal front guard plate.

[0050] Figure 3 The utility model is a cross-sectional view of a ceramic composite metal front guard plate structure.

[0051] Figure 4 The utility model is a schematic diagram of a ceramic composite metal sheath structure.

[0052] Figure 5 The utility model is a cross-sectional view of a ceramic composite metal sheath structure.

[0053] Figure 6 The utility model is a schematic diagram of a ceramic composite metal impeller structure.

[0054] Figure 7 The utility model is a cross-sectional view of a ceramic composite metal impeller structure.

[0055] In the figure, 1, bracket; 2, bearing assembly; 3, stuffing box; 4, pump casing; 5, front guard plate; 6, rear guard plate; 7, sleeve; 8, impeller; 9, guard plate ceramic block; 9a, cylindrical ceramic block; 9b, inner ring guard plate ceramic block; 9c, outer ring guard plate ceramic block; 11, guard plate metal frame; 12, sleeve ceramic block; 13, sleeve metal shell; 14, impeller ceramic block; 14a, impeller suction port ceramic block; 14b, front cover plate outer diameter circumference ceramic block; 14c, rear cover plate outer diameter circumference; 14d, blade working surface ceramic block; 15, impeller metal frame. DETAILED DESCRIPTION

[0056] The present invention is further described in detail with reference to the following specific embodiments and drawings. The process, conditions, experimental methods, etc. for implementing the present invention, except for the contents specifically mentioned below, are all common knowledge and common common sense in the art, and the present invention has no special restrictions.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0060] In the present application, the term "comprising" is an open expression, that is, including the contents specified in the present invention, but not excluding other contents.

[0061] In this application, the term "about" when applied to a value means allowing some slight imprecision in the value in the calculation or measurement (approaching the value with some accuracy; approximately or reasonably close to the value; nearly).

[0062] In the present application, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0063] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0064] The utility model provides a wear-resistant ceramic composite metal slurry pump for mineral processing, the slurry pump comprises: a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a sleeve 7, and an impeller 8. The front guard plate 5, the rear guard plate 6, the sleeve 7, the impeller 8 and other flow-through parts all adopt a structure in which ceramic blocks are bonded to a metal skeleton.

[0065] Furthermore, the CFD and Rocky coupling calculation method is used to simulate the wear-prone areas of the flow-through parts such as the front guard plate 5, the rear guard plate 6, the jacket 7 and the impeller 8, and the ceramic blocks are bonded to the corresponding wear areas;

[0066] Furthermore, the front guard plate 5 and the rear guard plate 6 each comprise a guard plate ceramic block 9 and a guard plate metal frame 11; the guard plate ceramic block 9 is bonded and fixed to the guard plate metal frame 11; the guard plate ceramic block 9 is divided into two areas, an entrance and a plane area, and a cylindrical ceramic block 9a is bonded to the entrance of the guard plate; the ceramic blocks in the plane area are divided into one or more circles according to the diameter of the guard plate, and the inner circle guard plate ceramic block 9b and the outer circle guard plate ceramic block 9c are evenly divided into one or more circles along the circumferential direction, and the circumferential direction and the radial direction are mutually nested and fitted to prevent the slurry from wearing through the guard plate metal frame 11 from the joints, thereby affecting the service life;

[0067] The joints of the inner ring guard plate ceramic block 9b and the outer ring guard plate ceramic block 9c should be staggered;

[0068] The sharp corners of the inner ring guard plate ceramic block 9b cooperate with the inlet of the impeller 8 to prevent the slurry from flowing back to the inlet;

[0069] The outer diameter of the guard plate 8 is wrapped with a sealing ring, and when assembled with the sheath 7, a certain sealing performance is guaranteed.

[0070] Furthermore, the sheath 7 is an integral structure, comprising a sheath ceramic block 12 and a sheath metal shell 13; the sheath ceramic block 12 is divided into one or more parts along the circumferential direction of the sheath metal shell 13; according to the easily worn area of ​​the sheath obtained by calculation, the entire metal sheath flow surface or the local severely worn position, such as the tongue area, is covered, and the sheath ceramic block 12 is fixed to the sheath metal shell 13 by an adhesive;

[0071] Furthermore, the impeller 8 comprises an impeller ceramic block 14 and an impeller metal frame 15;

[0072] The impeller ceramic block 14 is bonded to the impeller 8's easily worn areas according to the calculated easily worn areas of the impeller 8: including the impeller suction port, the outer diameter circumference of the front cover plate, the outer diameter circumference of the rear cover plate, and the blade working surface. The impeller ceramic block 14 is bonded to the main surface of the impeller 8 and then cured at high temperature.

[0073] The impeller metal frame 15 is made of high chromium alloy material;

[0074] Furthermore, the adhesive may be one or more of epoxy resin structural adhesive, AB adhesive, etc.; the gaps between the ceramic blocks are filled with the adhesive at high pressure to ensure the integrity of the wear surface of the ceramic blocks and prevent the slurry from grinding through the skeleton from the gaps;

[0075] Furthermore, the ceramic blocks are made of wear-resistant ceramic materials, including a guard plate ceramic block 9, a jacket ceramic block 12 and an impeller ceramic block 14, which can be made of any one of reaction-sintered silicon carbide ceramics, pressureless-sintered silicon carbide ceramics, silicon nitride ceramics or recrystallized ceramics alone or in a free combination to form a wear-resistant ceramic layer; the density of the ceramic blocks is not less than 3.03 g / cm 3 , hardness not less than 90HRA; bending strength not less than 350MPa;

[0076] Furthermore, when the ceramic block is severely worn locally, it can be replaced separately, thus extending the service life and reducing the maintenance cost;

[0077] Furthermore, the material of the metal skeleton can be high chromium alloy, Q235B carbon structural steel or QT500-7 ductile iron and other grades of materials.

[0078] Example 1

[0079] like Figure 1 The wear-resistant ceramic composite metal slurry pump for mineral processing in this embodiment includes a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a sleeve 7, and an impeller 8;

[0080] like Figure 2 As shown, the front guard plate 5 includes a guard plate ceramic block 9 and a guard plate metal frame 11.

[0081] The guard plate ceramic block 9 is divided into two areas, the entrance and the plane area. The cylindrical ceramic block 9a is bonded to the entrance of the front guard plate; the ceramic blocks in the plane area are divided into two circles, and the inner and outer circle ceramic blocks are evenly distributed along the circumferential direction, including 8 inner circle guard plate ceramic blocks 9b and 12 outer circle guard plate ceramic blocks 9c. The circumferential direction and the radial direction are mutually nested and bonded. Figure 3 As shown, the slurry is prevented from wearing through the metal frame from the joints, which will affect the service life; the joints of the inner ring guard plate ceramic block 9b and the outer ring guard plate ceramic block 9c should be staggered; the sharp corners of the inner ring guard plate ceramic block match the impeller inlet to prevent the slurry from flowing back to the inlet; the outer diameter of the guard plate is wrapped with a sealing ring 9d, and when it is assembled with the sleeve, a certain degree of sealing is guaranteed. Among them, the guard plate metal frame 11 is made of Q235B carbon structural steel material. The method of metal bonding ceramic block of the rear guard plate 6 is the same as that of the front guard plate 5.

[0082] like Figure 4 and Figure 5 As shown, the sheath 7 is an integral structure, comprising a sheath ceramic block 12 and a sheath metal shell 13; the sheath ceramic block 12 is divided into 17 parts along the circumferential direction of the sheath metal shell 13; the wear position is obtained by using CFD and Rocky coupling calculation methods, the sheath ceramic block 12 covers the entire metal sheath flow surface, and the sheath ceramic block 12 is fixed to the sheath metal shell 13 by an adhesive 10; wherein, the sheath metal shell 13 is made of QT500-7 ductile iron material.

[0083] like Figure 6 and Figure 7 As shown, the impeller 8 includes an impeller ceramic block 14 and an impeller metal frame 15; the impeller ceramic block 14 is bonded to the impeller's easily worn areas in combination with the wear area calculated by CFD and Rocky coupling: including the impeller suction port, the front cover plate circumference, the rear cover plate circumference, and the blade working surface. The impeller ceramic block 14 is bonded to the main surface of the impeller 8 and then cured at high temperature; wherein the impeller metal frame 15 is made of high chromium alloy material;

[0084] In this embodiment, the guard plate ceramic block 9, the jacket ceramic block 12 and the impeller ceramic block 14 are made of reaction-sintered silicon carbide material.

[0085] The adhesive can be epoxy resin structural adhesive, AB adhesive or a combination of resin and silicon carbide; the gaps between the ceramic blocks are filled with adhesive at high pressure to ensure the integrity of the wear surface of the ceramic blocks and prevent the slurry from grinding through the skeleton from the gaps;

[0086] Combined with the above steps, the front guard plate 5, the rear guard plate 6, the sleeve 7, the impeller 8, the pump casing 4, the bearing assembly 2, the stuffing box 3 and the bracket 1 with ceramic bonding metal are finally assembled to form a complete slurry pump.

[0087] Example 2

[0088] The wear-resistant ceramic composite metal slurry pump for mineral processing in this embodiment includes a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a sleeve 7, and an impeller 8;

[0089] The front guard plate 5 comprises a guard plate ceramic block 9 and a guard plate metal frame 11.

[0090] The guard plate ceramic block 9 is divided into two areas, the entrance and the plane area. The cylindrical ceramic block 9a is bonded to the entrance of the front guard plate; the ceramic blocks in the plane area are divided into three circles, and the inner and outer circle ceramic blocks are evenly distributed along the circumferential direction, including 7 inner circle guard plate ceramic blocks 9b and 10 outer circle guard plate ceramic blocks 9c. The circumferential direction and radial direction are mutually nested and fitted to prevent the slurry from grinding through the metal frame from the joints, affecting the service life; the joints of the inner circle guard plate ceramic block 9b and the outer circle guard plate ceramic block 9c should be staggered; the sharp corners of the inner circle guard plate ceramic block are matched with the impeller entrance to prevent the slurry from flowing back to the entrance; the outer diameter of the guard plate is wrapped with a sealing ring 9d, and when it is assembled with the sleeve, a certain degree of sealing is guaranteed. Among them, the guard plate metal frame 11 is made of Q235B carbon structural steel material. The method of metal bonding ceramic blocks of the rear guard plate 6 is the same as that of the front guard plate 5.

[0091] The sheath 7 is an integral structure, comprising a sheath ceramic block 12 and a sheath metal shell 13; the sheath ceramic block 12 is divided into 15 parts along the circumferential direction of the sheath metal shell 13; the sheath flow surface of the sheath is covered with local severe wear positions, and the severe wear positions of the tongue area are separated by CFD and Rocky coupling calculation methods, and the sheath ceramic block 12 is fixed to the sheath metal shell 13 by an adhesive 10; wherein, the sheath metal shell 13 is made of QT500-7 ductile iron material.

[0092] The impeller 8 comprises an impeller ceramic block 14 and an impeller metal frame 15; the impeller ceramic block 14 is bonded to the impeller's easily worn areas in combination with the wear area calculated by CFD and Rocky coupling, including the impeller suction port, the front cover plate circumference, the rear cover plate circumference, and the blade working surface, and the impeller ceramic block 14 is bonded to the main surface of the impeller 8 and then cured at high temperature; wherein the impeller metal frame 15 is made of high chromium alloy material;

[0093] In this embodiment, the guard plate ceramic block 9, the jacket ceramic block 12 and the impeller ceramic block 14 are made of pressureless sintered silicon carbide material.

[0094] The adhesive may be AB glue; the gaps between the ceramic blocks are filled with the adhesive at high pressure to ensure the integrity of the wear surface of the ceramic blocks and prevent the slurry from grinding through the skeleton from the gaps;

[0095] Combined with the above steps, the front guard plate 5, the rear guard plate 6, the sleeve 7, the impeller 8, the pump casing 4, the bearing assembly 2, the stuffing box 3 and the bracket 1 with ceramic bonding metal are finally assembled to form a complete slurry pump.

[0096] Example 3

[0097] The present embodiment provides a method for preparing a composite material of a ceramic block bonded to a metal, the preparation method comprising: applying an adhesive on the surface of the ceramic block, placing the adhesive on the bonding position of the metal skeleton, placing the metal skeleton bonded with the ceramic block into an oven for curing, the temperature being set to 80°C, and the drying time being 2 hours.

[0098] Example 4

[0099] This embodiment provides an impeller that cooperates with a slurry pump jacket, wherein the impeller includes an impeller body and a plurality of wear-resistant ceramic blocks bonded thereto, wherein the material of the impeller is cemented carbide.

[0100] Among them, the impeller is made of cemented carbide, which can improve the stability of the mechanical properties of the slurry pump impeller.

[0101] The number of wear-resistant ceramic blocks can be set according to actual conditions and is not specifically limited here.

[0102] The impeller comprises a front cover plate, a rear cover plate and a plurality of blades. The front cover plate and the rear cover plate are arranged opposite to each other, the plurality of blades are arranged between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are connected through the plurality of blades.

[0103] A plurality of grooves are arranged in the easily-worn area on the impeller, and the wear-resistant ceramic blocks are arranged in the grooves and fixedly connected to the impeller.

[0104] In a specific embodiment, a plurality of grooves can be arranged in the easily worn area on the impeller, and a wear-resistant ceramic block can be arranged in each groove. The high hardness, wear resistance and corrosion resistance of the wear-resistant ceramic can be utilized to improve the local wear resistance of the slurry pump impeller, thereby increasing the life of the slurry pump impeller and solving the problem of short life of the slurry pump impeller.

[0105] Among them, using multiple small wear-resistant ceramic blocks to set the easy-to-wear area on the impeller can solve the process difficulty of wear-resistant ceramics being difficult to scale up, and at the same time can reduce the cost of the slurry pump impeller. Among them, the size of the wear-resistant ceramic block can be determined according to the diameter of the impeller and the ceramic molding process.

[0106] An impeller suction port is arranged in the middle of the impeller front cover plate, wherein the fluid enters the slurry pump impeller from the impeller suction port.

[0107] Among them, a plurality of grooves are arranged on the inner side surface of the front cover plate facing the rear cover plate, and are arranged at intervals along the circumferential direction of the inner side surface of the front cover plate. That is, the inner side surface of the front cover plate facing the rear cover plate is a position prone to wear of the impeller.

[0108] Among them, a plurality of grooves are arranged on the inner side surface of the rear cover plate facing the front cover plate, and are arranged at intervals along the circumferential direction of the inner side surface of the rear cover plate. That is, the inner side surface of the rear cover plate facing the front cover plate is a position prone to wear of the impeller.

[0109] Wherein, a plurality of grooves are arranged on the inner surface of the impeller suction port, that is, the inner surface of the impeller suction port is a position of the impeller that is prone to wear.

[0110] There are multiple grooves on the working surface of each blade, that is, the working surface of each blade is a wear-prone position of the impeller.

[0111] Wherein, each wear-resistant ceramic block is fixedly connected to the impeller through an adhesive.

[0112] The plurality of wear-resistant ceramic blocks include at least one of silicon carbide ceramics, silicon nitride combined with silicon carbide ceramics, silicon oxide ceramics combined with silicon carbide ceramics and recrystallized ceramics.

[0113] For example, a plurality of wear-resistant ceramic blocks are all silicon carbide ceramics, or a portion of the wear-resistant ceramic inserts are silicon carbide ceramics, and the remaining portions are silicon nitride combined with silicon carbide ceramics. That is, the wear-resistant ceramic blocks can be composed of any one of silicon carbide ceramics, silicon nitride combined with silicon carbide ceramics, silicon oxide ceramics combined with silicon carbide ceramics, and recrystallized ceramics, either alone or in combination.

[0114] The impeller is integrally cast.

[0115] A raised portion is arranged in the middle of the rear cover plate, and a threaded hole for matching and connecting with the pump shaft of the slurry pump is arranged at the center of the raised portion.

[0116] Wherein, each blade is in the shape of an arc.

[0117] The slurry pump impeller provided in the utility model is provided with a plurality of grooves in the easily worn area on the impeller, and a wear-resistant ceramic block is provided in each groove. The high hardness, wear resistance and corrosion resistance of the wear-resistant ceramic are utilized to improve the local wear resistance of the slurry pump impeller, thereby improving the life of the slurry pump impeller and solving the problem of short life of the slurry pump impeller. In addition, since an impeller made of cemented carbide is used, the mechanical properties of the slurry pump impeller are stable. Finally, the use of a plurality of small wear-resistant ceramic blocks arranged in the easily worn area on the impeller can solve the process difficulty of large-scale wear-resistant ceramics, and at the same time can reduce the cost of the slurry pump impeller.

[0118] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the attached claims.

Claims

1. A wear-resistant ceramic composite metal slurry pump for mineral processing, It is characterized in that The slurry pump comprises a bracket (1), a bearing assembly (2), a stuffing box (3), a pump casing (4) and a flow-through component; the flow-through component comprises a front guard plate (5), a rear guard plate (6), a sleeve (7) and an impeller (8); the front guard plate (5), the rear guard plate (6), the sleeve (7) and the impeller (8) all adopt a structure in which a ceramic block is fixedly arranged on a metal frame; the ceramic block is fixedly arranged on the metal frame in a wear-prone area of ​​the flow-through component; The sheath (7) comprises: a sheath ceramic block (12) and a sheath metal shell (13); the sheath ceramic block (12) is fixed inside the sheath metal shell (13); the sheath ceramic block (12) is divided into one or more along the circumferential direction of the sheath metal shell (13), covering the internal flow surface or the easily-worn area of ​​the sheath.

2. The slurry pump according to claim 1, It is characterized in that The radial height of the ceramic block does not exceed 300 mm, the outer diameter width does not exceed 300 mm, and the thickness ranges from 15 to 30 mm.

3. The slurry pump according to claim 1, It is characterized in that The front guard plate (5) and / or the rear guard plate (6) both include: a guard plate ceramic block (9) and a guard plate metal frame (11); the guard plate ceramic block (9) is fixed on the guard plate metal frame (11); the guard plate metal frame (11) includes an integrated hollow metal cylinder and a flat metal ring fixed to one end of the hollow metal cylinder, the inner ring size of the flat metal ring matches the inner diameter of the hollow metal cylinder; the guard plate ceramic block (9) completely fits and covers the inner surface of the hollow metal cylinder and / or the lower surface of the flat metal ring.

4. The slurry pump according to claim 3, It is characterized in that The portion of the guard plate ceramic block (9) covering the inner surface of the hollow metal cylinder is an integral cylindrical ceramic block (9a); and / or, The part of the guard plate ceramic block (9) covering the lower surface of the planar metal ring is one or more layers, each layer comprising a ceramic block group consisting of one or more circles of ceramic blocks; the ceramic block group is divided into one or more circles according to the radial width of the ring on the lower surface of the guard plate; the ceramic block groups of each two adjacent circles are staggered and embedded by setting a step-like structure; each circle of the ceramic block group is divided into one or more in the circumferential direction, and the adjacent two ceramic blocks in each circle are staggered and embedded by setting a step-like structure; The sharp corner of the inner ring guard plate ceramic block (9b) is matched with the impeller inlet, and the matching clearance is controlled within 1-5mm; The planar metal ring of the guard plate and the outer edge of the ceramic block (9) fixed on the metal plane are wrapped with a sealing ring (9d).

5. The slurry pump according to claim 1, It is characterized in that The impeller (8) comprises: an impeller ceramic block (14) and an impeller metal frame (15); The impeller ceramic block (14) is fixedly arranged in the easily worn area of ​​the impeller (8); the easily worn area of ​​the impeller (8) includes the impeller suction port, the outer diameter circumference of the front cover plate, the outer diameter circumference of the rear cover plate, and the blade working surface; the corresponding impeller ceramic block (14) includes the impeller suction port ceramic block (14a), the front cover plate outer diameter circumference ceramic block (14b), the rear cover plate outer diameter circumference ceramic block (14c), and the blade working surface ceramic block (14d).

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