CN113117907A

CN113117907A - Wear-resistant swirler and manufacturing method thereof

Info

Publication number: CN113117907A
Application number: CN201911387975.3A
Authority: CN
Inventors: 肖琼; 刘易军
Original assignee: Guangzhou Totall New Material Technology Co ltd
Current assignee: Guangzhou Totall New Material Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-16

Abstract

The invention discloses a wear-resistant cyclone and a manufacturing method thereof, wherein the cyclone comprises a cylindrical section and a conical section, a feed inlet is arranged on the cylindrical section, the cylindrical section and the conical section respectively comprise an outer shell layer, a bonding layer and an inner lining layer which are sequentially connected, and a first wear-resistant plate is arranged at the joint part of the inner lining layer of the cylindrical section and the feed inlet; the first wear-resisting plate is made of silicon carbide or silicon nitride, and the lining layer is made of a combined silicon carbide material. The manufacturing method comprises the steps of putting the first wear-resisting plate coated with organic glue into a preset position in a lining layer forming die, and injecting a mixture into the die to form a blank of the lining layer; and (3) ablating organic glue, filling nitrogen or air at high temperature to generate silicon nitride or silicon oxide to obtain an inner liner layer, and bonding the inner liner layer with the shell layer. The wear-resistant cyclone and the manufacturing method thereof have the advantages of long service life, high reliability, good grading effect, easiness in production and processing and capability of controlling the manufacturing cost within a proper range.

Description

Wear-resistant swirler and manufacturing method thereof

Technical Field

The invention relates to the field of material separation, in particular to a wear-resistant cyclone for solid-liquid separation, liquid-liquid separation of different densities, solid-solid separation of different particle sizes or different densities and liquid-gas separation of a treated feed liquid by taking liquid or gas as a continuous phase carrier and a manufacturing method thereof.

Background

The cyclone is a high-efficiency sorting, grading, concentrating and desliming device. The cyclone generally comprises: the work barrel that the back taper section that hollow cylinder section in upper portion and lower part and cylinder section are linked together constitutes, work barrel cylinder section one side is equipped with the feed inlet, the overflow mouth at work barrel cylinder section top, the bin outlet of work barrel back taper section bottom.

The cyclone has the working principle that a liquid-solid two-phase mixture or a gas-solid two-phase mixture with a certain density difference is separated under the action of centrifugal force. The mixture enters the cyclone tangentially at a certain pressure, and a high-speed rotating flow field is generated in the cylindrical cavity. The components with high density in the mixture simultaneously move downwards along the axial direction under the action of the cyclone field, move outwards along the radial direction, move downwards along the wall of the cone section when reaching the cone section, and are discharged from the bottom flow port, so that an outer vortex flow field is formed; the component with low density moves towards the direction of the central axis, forms an inner vortex moving upwards in the center of the axis and is discharged from the overflow port, thus achieving the purpose of separating two phases or separating coarse and fine particles.

Under many working conditions, the medium has large particles, large flow and large pressure, the abrasion to the inner wall of the cavity of the cyclone is very serious, particularly the abrasion to the feed inlet and the cylindrical section of the cyclone is very serious, and the lining is required to be made of wear-resistant materials.

The lining materials of the prior cyclone mainly comprise rubber, polyurethane, ceramic and the like, wherein the rubber and the polyurethane have poor wear resistance and can only be used in some working conditions with weak wear resistance.

Ceramics are known to have much higher wear resistance than rubber and polyurethane, such as silicon carbide ceramics, silicon nitride ceramics, alumina ceramics, etc., which can be several times or even tens of times higher than wear resistant alloys. CN 204933752U discloses some technical solutions of ceramic cyclone. In view of the current state of the art, the ceramic material from which the abradable swirler is made is primarily alumina (Al)₂O₃) Silicon nitride (Si)₃N₄) Silicon carbide (SiC), bonded silicon carbide ceramics, and the like. The wear resistance of the alumina ceramic is relatively poor, the large-scale production is not easy to occur, and the silicon nitride has high cost and large-scale production difficulty due to the process reason; the silicon carbide ceramic has excellent wear resistance and relatively low cost, but is difficult to be upsized due to process reasons, and only a few small cyclones can be manufactured at present, so that the application of the silicon carbide ceramic is limited.

In order to solve the problem that the large-sized cyclone is difficult to manufacture by using the wear-resistant material, CN 206911585U and the like propose a technical scheme of combining a large number of small ceramic plates with various shapes to form a ceramic liner, and the technology can manufacture the large-sized cyclone, but has the following problems: one is the reliability of ceramic chip fixation, although various technical means are adopted to improve the reliability of ceramic chip fixation, because the ceramic chips are more in quantity, as long as one of the ceramic chips is not fixed firmly and falls off, the rotator can perforate at the position and be scrapped; in the second method, a large number of splicing seams exist among the ceramic plates, although the mixture of wear-resistant particles and resin can be filled among the splicing seams to prevent the splicing seams from being worn, the wear resistance of the mixture is greatly lower than that of the ceramic plates, the cyclone is easily scrapped due to the wearing of the splicing seams, and meanwhile, the large number of splicing seams among the ceramic plates can also disturb the movement of fluid, so that the grading or separating effect is deteriorated.

The bonded silicon carbide ceramic is a material formed by bonding and taking silicon carbide as a main phase, wherein the main phase silicon carbide has good wear resistance and lower cost; the role of the binder phase is to bind the particles of the main phase into one piece. According to different binding phases, the types of the bonded silicon carbide ceramics are various, and the common types are as follows: silicon nitride-bonded silicon carbide, oxide-bonded silicon carbide, oxynitride-bonded silicon carbide, sialon-bonded silicon carbide, mullite-bonded silicon carbide, and the like. The microstructure and manufacturing process of the above several bonded silicon carbide ceramics are similar. The microstructure is a network of bound phases encapsulating the main phase particles, wherein the weight ratio of silicon carbide is about 70-90% and the weight ratio of bound phases is about 10-30%. The bonded silicon carbide ceramics hardly change in size during sintering, and the network-like bonding phase contains a certain number of tiny pores. The tiny pores are not only beneficial to avoiding the defects of cracking and the like during sintering and the enlargement of workpieces, but also beneficial to absorbing impact energy during the operation of the pump body and improving the impact resistance of the material. It is now possible to manufacture cyclone units of larger dimensions.

The manufacturing process of the silicon nitride and the silicon carbide comprises the following steps: mixing 70-75 wt% of silicon carbide particles, 20-25 wt% of silicon powder and a binding agent, molding, drying, placing in a nitriding furnace, heating to 1410-1430 ℃, introducing high-purity nitrogen, reacting the nitrogen with the silicon powder to generate silicon nitride, coating the silicon carbide particles with the generated silicon nitride in a network shape, and forming a combination body with certain strength. Sometimes, to improve certain properties, small amounts (generally not more than 5%) of alumina, silica, mullite, etc. are added to the mix.

The manufacturing process of the oxide combined silicon carbide comprises the following steps: mixing silicon carbide particles 70-75 wt%, silicon powder 20-25 wt% and binder (optionally adding small amount of alumina, calcium oxide, mullite, etc. to improve certain properties), molding, and drying; and (3) putting the silicon carbide powder into a sintering furnace, heating the silicon carbide powder to 1410-1430 ℃, reacting oxygen in the air with silicon powder to generate silicon dioxide, and coating the silicon carbide powder with the generated silicon dioxide in a network shape to form a combined body with certain strength.

The manufacturing process of the oxynitride combined with the silicon carbide comprises the following steps: mixing silicon carbide particles, silicon powder, silicon dioxide, clay and a bonding agent, drying after molding, putting the mixture into a sintering furnace, heating to 1410-1430 ℃, introducing nitrogen gas to react to generate silicon oxynitride, coating the silicon carbide particles in a network shape, and forming a combined body with certain strength.

The manufacturing process of the sialon combined silicon carbide comprises the following steps: mixing silicon carbide particles, silicon powder, aluminum oxide and a bonding agent, drying after molding, putting the mixture into a sintering furnace, heating to 1410-1430 ℃, introducing nitrogen gas to react to generate sialon, coating the silicon carbide particles in a network shape, and forming a combination with certain strength.

The manufacturing process of the mullite combined with the silicon carbide comprises the following steps: mixing silicon carbide particles, silicon oxide powder, aluminum oxide, mullite and a binding agent, drying after molding, putting the mixture into a sintering furnace, heating to 1410-1430 ℃, coating the silicon carbide particles with the mullite generated by the reaction in a network shape, and forming a combination body with certain strength.

The swirler manufactured by combining silicon carbide has lower manufacturing cost due to better manufacturability. However, the above-described bonded silicon carbide swirler liners have been found to be less effective when used in applications where large particles are present in the media, particularly where the feed inlet and cylindrical section interface at a rate of wear more than twice that of the other sections. The rapid abrasion of the part not only causes the service life of the cyclone to be greatly reduced, but also causes some important geometric dimension changes after the part is abraded, and the grading or separating effect is influenced.

To sum up, the ceramic lining swirler of the prior art has the problems of poor wear resistance, poor grading separation effect, unstable quality and large manufacturing process difficulty.

Disclosure of Invention

The invention aims to provide a wear-resistant cyclone and a manufacturing method thereof, which have longer service life, higher reliability, better grading effect, easy production and processing and controllable manufacturing cost in a proper range.

In order to achieve the purpose, the invention provides a wear-resistant cyclone, which comprises a cylindrical section and a conical section which are communicated up and down, wherein a feeding hole is formed in the cylindrical section, and the cylindrical section and the conical section respectively comprise a shell layer, an adhesive layer and an inner liner layer which are sequentially connected; the first wear-resisting plate is made of silicon carbide or silicon nitride, and the lining layer is made of a combined silicon carbide material.

As a further improvement of the invention, the cavity is positioned on the area of the axial projection of the feed inlet on the lining layer of the cylindrical section.

As a further improvement of the invention, the hole cavity is any one of a through hole, a blind hole with one closed end or a fully closed cavity.

As a further improvement of the invention, the first wear plate is formed by splicing at least two plates.

As a further improvement of the invention, the inner liner of the cylindrical section is provided with a covering layer which is integrally sintered with the inner liner, and the covering layer partially or completely covers the outer side surface and/or the inner side surface of the first wear-resisting plate.

As a further improvement of the invention, a second wear-resistant plate is arranged on the inner side of the inner liner of the cylindrical section, and the second wear-resistant plate extends along the flowing direction of the medium from the edge of the first wear-resistant plate far away from the feed inlet; the second wear-resisting plate is made of silicon carbide or silicon nitride ceramics.

As a further improvement of the invention, the second wear-resisting plate is formed by splicing at least two plates; the inner liner of cylinder section is equipped with the recess, the second antifriction plate passes through the bonding agent to bond in the recess.

As a further improvement of the present invention, the bonded silicon carbide comprises one of silicon nitride bonded silicon carbide, oxide bonded silicon carbide, sialon bonded silicon carbide, mullite bonded silicon carbide, oxynitride bonded silicon carbide or any combination thereof.

As a further improvement of the present invention, wear-resistant particles are added in the bonding layer, and the wear-resistant particles include one of silicon carbide, silicon nitride, aluminum oxide, zirconium oxide, garnet, quartz, or any combination thereof.

As a further improvement of the invention, the combination part of the hole cavity and the first wear-resisting plate is provided with an air gap with the average width not exceeding 1mm, and the air gap is filled with adhesive.

In order to achieve the above object, the present invention further provides a method for manufacturing a wear-resistant cyclone, comprising the following steps:

1) firing the first wear plate;

2) coating machine glue on the surface of the fired first wear-resisting plate;

3) placing the first wear-resisting plate coated with the organic glue into a preset position in an inner liner forming die and fixing;

4) preparing a pouring mixture combined with silicon carbide;

5) the prepared combined silicon carbide pouring mixture is injected into a die fixed with a first wear-resistant plate, the die is filled with the combined silicon carbide pouring mixture, and the combined silicon carbide pouring mixture is hardened and formed to form a blank of an inner lining layer embedded with the first wear-resistant plate;

6) placing the lining layer blank embedded with the first wear-resistant plate into a sintering furnace, and ablating organic glue coated on the surface of the first wear-resistant plate at the temperature of 300-500 ℃;

7) under the condition of 1300 plus 1450 ℃, nitrogen or air is filled in to react the metal silicon in the mixture to generate silicon nitride or silicon oxide, and the lining layer embedded with the first wear-resisting plate is obtained;

8) the lining layer embedded with the first wear-resisting plate is placed into the cyclone casing layer for positioning, adhesive is filled between the lining layer and the casing layer, the lining layer and the first wear-resisting plate are bonded into a whole.

Advantageous effects

Compared with the prior art, the abrasion-resistant cyclone has the advantages that:

1. the silicon carbide is combined, because certain micro-pores exist in the combined phase, the manufacturability is good, and a large-size workpiece is easy to manufacture, so that the silicon carbide can be used for manufacturing the inner liner of the cylindrical section of the large cyclone with the integral structure, the inner liner can be prevented from falling off, the reliability of the cyclone is improved, and meanwhile, because almost no splicing seam exists, the grading separation effect of the cyclone is improved. Wherein, classification refers to the separation of particles in a medium according to size.

2. Because the medium changes the flow direction suddenly at the joint of the cylindrical section and the feed inlet, the abrasion speed at the joint is much faster than that of the rest parts, generally more than 3 times of that of the rest parts, and if the material of the lining layer is combined with silicon carbide, the lining can be worn through in advance at the joint. The first wear-resisting plate made of silicon carbide or silicon nitride and having better wear resistance is arranged at the position, so that the wear speed of the position can be greatly reduced, the service life of the cyclone is prolonged by more than 50%, and the grading effect is prevented from being deteriorated due to the fact that the geometric shape of the position is remarkably changed after the position is seriously worn, and the grading separation efficiency is improved.

3. By adopting the manufacturing method of the technical scheme, the gap between the inner liner and the first wear-resisting plate can be controlled to be small and almost in seamless connection, so that the grading separation effect can be prevented from being deteriorated, and the phenomenon that the swirler is perforated due to the fact that fluid abrades the adhesive in the gap between the inner liner and the first wear-resisting plate can be prevented.

4. Because the inner liner of cylinder section can be an overall structure, the reliability that consequently the inner liner of cylinder section bonded is much higher than the reliability of concatenation inner liner.

5. The second antifriction plate that sets up the carborundum or the silicon nitride material that extend along the fluid direction from first antifriction plate can further improve swirler's wear resistance, increase of service life.

6. The first wear-resisting plate and/or the second wear-resisting plate are formed by splicing at least two plates, so that the wear-resisting plates have smaller overall dimensions, the manufacturing difficulty of the wear-resisting plates is reduced, and the yield of products is improved.

7. After adding wear-resisting granule in the adhesive linkage, the adhesive linkage will possess certain wear resistance, not only is favorable to reducing the manufacturing cost of adhesive linkage, can also prevent that medium directly from brushing the shell layer in the fluid after the inner liner of cylinder section or first antifriction plate wear-out, is favorable to prolonging the life-span of swirler.

8. According to the wear-resistant cyclone manufactured by the method provided by the technical scheme, the manufacturing process of the inner liner embedded with the first wear-resistant layer is simple, the gap between the first wear-resistant plate and the inner liner of the cylindrical section is extremely small or even has no gap, and the fixing reliability of the first wear-resistant plate is greatly improved compared with the prior art.

9. The purpose of coating the first wear-resisting plate with 0.2-1mm of organic glue is as follows: the expansion coefficient of the first wear-resistant plate made of silicon carbide or silicon nitride ceramic material is different from that of the combined silicon carbide material, the inner liner or the first wear-resistant plate of the cylindrical section can be broken due to size change in the sintering or cooling process, after the first wear-resistant plate is coated with organic glue, when the sintering temperature reaches 300-500 ℃, the organic glue can be ablated, and an air gap of 0.2-1mm is generated between the first wear-resistant plate and the inner liner of the cylindrical section, so that the breakage can be avoided in the subsequent sintering process.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front cross-sectional view of a wear resistant cyclone in accordance with embodiment 1;

FIG. 2 is a view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view showing the formation of the inner liner of the cylindrical section in example 1;

FIG. 4 is a cross-sectional view of the abradable cyclone in embodiment 2;

FIG. 5 is a transverse cross-sectional view of the cylindrical segment liner of example 2;

fig. 6 is a schematic view of the cylindrical segment liner formation in example 2.

Detailed Description

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Example 1

The specific implementation mode of the invention is as shown in fig. 1 to 3, and the abrasion-resistant cyclone comprises a cylindrical section and a conical section which are communicated up and down, wherein a feeding hole 104 is arranged on the cylindrical section, the cylindrical section and the conical section respectively comprise a shell layer, an adhesive layer and an inner liner layer which are sequentially connected, a hole cavity is arranged at the joint part of the inner liner layer of the cylindrical section and the feeding hole 104, a first abrasion-resistant plate 105 is arranged in the hole cavity, and the outline of the joint part of the hole cavity and the first abrasion-resistant plate 105 is matched. The first wear plate 105 is made of silicon carbide or silicon nitride, and the lining layer is made of a combined silicon carbide material.

The lining layers of the cylindrical section and the conical section can be of an integral structure or a split structure. In this embodiment, the inner liners of the cylindrical section and the conical section are in a split structure. The inner liner of cylinder section is cylinder section inner liner 103, and the shell layer of cylinder section is cylinder section shell layer 101, bonds through cylinder section adhesive linkage 102 between cylinder section shell 101 and the cylinder section inner liner 103. The conical section comprises a conical section outer shell layer 201 and a conical section lining layer 203, and the conical section outer shell layer 201 and the conical section lining layer 203 are bonded through a conical section bonding layer 202.

The bore is located in the region of the feed inlet 104 projected axially into the cylindrical section liner. The hole cavity is any one of a through hole, a blind hole with one end closed or a totally closed cavity.

The first wear plate 105 is formed by splicing at least two plates. In this embodiment, the first wear plate 105 is formed by assembling 2 ceramic plates.

The bonded silicon carbide comprises one of silicon nitride bonded silicon carbide, oxide bonded silicon carbide, sialon bonded silicon carbide, mullite bonded silicon carbide, oxynitride bonded silicon carbide or any combination thereof. In this embodiment, the first wear-resistant plate 105 is made of reaction-sintered silicon carbide, and the inner liner 103 of the cylindrical section is made of silicon nitride combined with silicon carbide.

The joint of the bore and the first wear plate 105 is provided with an air gap having an average width of no more than 1mm, and the air gap is filled with an adhesive. In this embodiment, an air gap with an average width of about 0.3mm is provided at a joint of the bore hole and the first wear plate 105, the air gap is left after the organic glue is ablated, and in order to prevent the first wear plate 105 from loosening and falling off, the air gap is filled with an adhesive, and the adhesive is epoxy resin.

The bonding layer 102 of the cylindrical section is added with wear-resistant particles, and the wear-resistant particles comprise one or any combination of silicon carbide, silicon nitride, aluminum oxide, zirconium oxide, garnet and quartz, so as to prolong the service life of the cyclone. In this embodiment, the adhesive used for the cylindrical section adhesive layer 102 is an epoxy adhesive.

In the schematic diagram of the formation of the inner liner 103 with the cylindrical section shown in fig. 3, the first wear plate 105 is fixed at a predetermined position between the outer mold 300 and the inner mold 400, a mixture for combining silicon carbide is poured from the pouring gate 600 to the pouring gap 500 between the molds, and after the mixture is hardened, a blank of the inner liner 103 with the cylindrical section embedded with the first wear plate 105 is obtained. Obviously, during this process, a bore hole will naturally form in the liner layer 103 of the cylindrical section, and the bore hole and the profile of the first wear plate 105 will naturally adapt to each other.

The inner lining layer of the cylindrical section is provided with a covering layer which is integrally sintered with the inner lining layer, and the covering layer partially or completely covers the outer side surface and/or the inner side surface of the first wear-resisting plate 105. Obviously, if the contour of the first wear plate 105 does not completely fit the outer mold 300 or the inner mold 400, after forming, the inner side surface or the outer side surface of the first wear plate 105 may be partially or completely covered with silicon carbide, and this structure may reduce the requirement for the dimensional accuracy of the first wear plate 105, the outer mold 300, and the inner mold 400 on the premise of ensuring that the working surface of the swirler is relatively continuous and smooth, thereby facilitating the reduction of the manufacturing cost. The hole cavity may be a through hole, a blind hole with one closed end, or a fully closed chamber.

The method for manufacturing the wear-resistant cyclone in the embodiment 1 comprises the following specific implementation steps:

1) manufacturing a blank of the first wear plate 105;

2) sintering the first wear plate 105 in a vacuum furnace;

3) coating the surface of the fired first wear plate 105 with an organic glue of a suitable thickness, typically (0.2-1mm), and hardening the organic glue;

4) fixing the first wear plate 105 coated with the organic glue at a corresponding position between the outer mold 300 and the inner mold 400;

5) mixing silicon carbide particles, metal silicon powder and a binding agent in proportion into a uniform mixture, and pouring the mixture into a mold;

6) removing the mold after the mixture is hardened;

7) drying the blank of the cylindrical section inner liner 103 embedded with the first wear plate 105;

8) placing the blank of the cylindrical section lining layer 103 embedded with the first wear-resisting plate 105 into a sintering furnace, heating to 300-500 ℃, and ablating organic glue to form an air gap of 0.2-1mm between the first wear-resisting plate 105 and the cylindrical section lining layer 103;

9) introducing high-purity nitrogen, and heating to 1410-1450 ℃ to obtain the cylindrical section lining layer 103 embedded with the first wear-resisting plate 105; in the embodiment, the introduced high-purity nitrogen is heated to about 1430 ℃;

or introducing air, and heating to 1410-1450 ℃ to obtain the inner lining layer 103 of the cylindrical section embedded with the first wear-resisting plate 105. In this embodiment, the introduced air is heated to about 1430 ℃;

10) and (3) putting the fired product of the cylindrical section lining layer 103 embedded with the first wear-resisting plate 105 into the cylindrical section shell layer 101, filling adhesive between the fired product and the cylindrical section shell layer, and obtaining a cylindrical section finished product after the adhesive is hardened.

Example 2

As shown in fig. 4 to 6, the difference from embodiment 1 is that a second wear plate 106 is arranged inside the inner liner of the cylindrical section, and the second wear plate 106 extends from the edge of the first wear plate 105 away from the feed opening 104 in the flow direction of the medium. The second wear plate 106 is made of silicon carbide or silicon nitride ceramic. As shown in fig. 5, a cylindrical section lining layer 103 embedded with a first wear plate 105 is provided, and a groove 107 for placing a second wear plate 106 is provided on the cylindrical section lining layer 103. The second wear plate 106 is formed by splicing two ceramic plates. The second wear plate 106 is bonded in the recess 107 by an adhesive.

In manufacturing, the first wear plate 105 coated with the organic glue is fixed at a predetermined position between the inner mold 400 and the outer mold 300, and the auxiliary mold 700 is fixed at a corresponding position of the inner mold 400. And injecting the combined silicon carbide mixture into the mold. After the mixture is hardened, a blank of the inner liner 103 embedded with the first wear plate 105 in the cylindrical section is obtained, and the auxiliary mold 700 is removed to form the groove 107.

After the cylindrical section lining layer 103 embedded with the first wear-resistant plate 105 is sintered and formed, the second wear-resistant plate 106 is bonded on the groove 107 by using an adhesive, namely, the cylindrical section lining layer 103 bonded with the second wear-resistant plate 106 is formed. In this embodiment, the first wear-resistant plate 105 is made of silicon nitride formed by hot pressing, and the inner liner 103 of the cylindrical section is made of oxide-bonded silicon carbide.

In this embodiment, the joint between the bore and the first wear plate 105 is provided with an air gap having an average width of about 0.4mm, and the air gap is filled with an adhesive, which is acrylic resin. The cylindrical section bonding layer 102 between the cylindrical section lining layer 103 and the cylindrical section casing layer 101 adopts cement as a bonding agent, and compared with the embodiment 1, the manufacturing cost can be saved.

It should be noted that the cylindrical section of the abradable cyclone is a generic name, and its geometry is not strictly cylindrical, and in some embodiments, the cylindrical section may be provided with a taper to improve its hydraulic performance in addition to the feed port; in some embodiments, two or more feed ports may also be provided in the cylindrical section.

The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.

Claims

1. A wear-resistant cyclone comprises a cylindrical section and a conical section which are communicated up and down, wherein a feeding hole (104) is formed in the cylindrical section, and the cylindrical section and the conical section respectively comprise an outer shell layer, a bonding layer and an inner liner which are sequentially connected; the first wear-resisting plate (105) is made of silicon carbide or silicon nitride, and the lining layer is made of a combined silicon carbide material.

2. A wear resistant cyclone in accordance with claim 1 wherein the bore is located in the region of the axial projection of the feed opening (104) onto the liner in the cylindrical section.

3. A wear resistant swirler as claimed in claim 1 or 2 wherein the bore is any one of a through hole, a blind hole closed at one end or a fully closed cavity.

4. A wear resistant swirler as claimed in claim 1, characterised in that the first wear plate (105) is made from at least two plates which are joined together.

5. A wear resistant swirler in accordance with claim 1 characterised in that the inner lining of the cylindrical section is provided with a coating sintered integrally therewith, the coating partially or completely covering the outer and/or inner side of the first wear plate (105).

6. A wear resistant cyclone according to claim 1, characterized in that a second wear plate (106) is arranged inside the inner lining of the cylindrical section, said second wear plate (106) extending from the edge of the first wear plate (105) remote from the inlet opening (104) in the flow direction of the medium; the second wear-resistant plate (106) is made of silicon carbide or silicon nitride ceramic.

7. A wear resistant swirler as claimed in claim 6, characterised in that the second wear plate (106) is made from at least two plates which are spliced together; be equipped with recess (107) on the inner liner of cylinder section, second antifriction plate (106) pass through the bonding of bonding agent in recess (107).

8. A wear resistant cyclone in accordance with claim 1 wherein said bonded silicon carbide comprises one of silicon nitride bonded silicon carbide, oxide bonded silicon carbide, sialon bonded silicon carbide, mullite bonded silicon carbide, oxynitride bonded silicon carbide or any combination thereof; the bonding layer is internally added with wear-resistant particles, and the wear-resistant particles comprise one of silicon carbide, silicon nitride, aluminum oxide, zirconium oxide, garnet and quartz or any combination thereof.

9. A wear resistant swirler in accordance with claim 1, characterised in that the junction of the bore and the first wear plate (105) is provided with an air gap having an average width of no more than 1mm, the air gap being filled with an adhesive.

10. A method of manufacturing a wear resistant swirler as claimed in claim 1, comprising the steps of:

1) firing the first wear plate (105);

2) coating machine glue on the surface of the fired first wear-resisting plate (105);

3) placing a first wear-resisting plate (105) coated with organic glue into a preset position in an inner liner forming die and fixing;

4) preparing a pouring mixture combined with silicon carbide;

5) the prepared combined silicon carbide pouring mixture is injected into a mold fixed with a first wear-resisting plate (105), the mold is filled with the prepared combined silicon carbide pouring mixture, and the prepared combined silicon carbide pouring mixture is hardened and formed to form a blank of an inner lining layer embedded with the first wear-resisting plate (105);

6) placing the lining layer blank embedded with the first wear-resisting plate (105) into a sintering furnace, and ablating organic glue coated on the surface of the first wear-resisting plate (105) at the temperature of 300-500 ℃;

7) under the condition of 1300-;

8) the inner liner embedded with the first wear plate (105) is placed into the cyclone casing layer for positioning, adhesive is filled between the inner liner and the casing layer, the inner liner and the first wear plate (105) are bonded into a whole.