CN112922902A

CN112922902A - Ceramic pump body

Info

Publication number: CN112922902A
Application number: CN201911244694.2A
Authority: CN
Inventors: 肖琼; 王学东
Original assignee: Guangzhou Totall New Material Technology Co ltd
Current assignee: Guangzhou Totall New Material Technology Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2021-06-08
Also published as: WO2021109625A1

Abstract

The invention discloses a ceramic pump body, which comprises a volute and a guard plate, wherein the volute comprises a shell and a volute lining; the protective plate comprises a protective plate framework and a protective plate lining, and a first buffer layer is arranged between the shell and the volute lining; the middle part of the volute is sequentially provided with a through hole and a taper hole from outside to inside, and the through hole is connected with the taper hole through a first axial end face; a second buffer layer is arranged between the guard plate framework and the guard plate lining, a shaft body and a conical shaft are sequentially arranged on the guard plate, and the shaft body is connected with the conical shaft through a second axial end face; the shaft body is matched with the through hole, and the conical shaft is matched with the conical hole; an annular space which is enclosed by the first axial end face, the second axial end face, the through hole inner wall and the conical shaft outer wall and used for placing a sealing element is arranged between the volute and the protective plate. According to the ceramic pump body provided by the invention, the medium cannot contact with the metal piece of the volute or the guard plate, so that the ceramic pump body has better wear resistance and corrosion resistance, and the manufacturing cost can be controlled within a proper range.

Description

Ceramic pump body

Technical Field

The invention relates to the field of rotary power pump equipment, in particular to a ceramic pump body.

Background

In the industries of ore dressing, smelting and the like, a centrifugal pump is often used for conveying a certain abrasive solid-liquid two-phase flow, and a slurry pump is often used at the time. Common slurry pumps are made of wear-resistant alloys such as Cr26 and Cr15Mo 3. The slurry pump made of the wear-resistant materials is difficult to meet the use requirements under a plurality of working conditions, and mainly has the following problems: 1) the abrasion problem is prominent, and the service life of the overflowing part can not meet the use requirement; 2) the cavitation resistance is poor, because the fluidity of the medium is continuously reduced along with the increase of the concentration of the two-phase flow, and the cavitation allowance is far smaller than that of clear water, so that the cavitation phenomenon appears when the flow rate of the pump is far smaller than a calibration value, not only is the overflowing part easy to damage, but also the performance of the pump, such as efficiency, lift, flow rate and the like, are obviously reduced.

Better wear resistance can be obtained by adopting composite wear-resistant materials, and the composite wear-resistant materials mainly comprise wear-resistant particles and a bonding agent. The most common materials for the wear-resistant particles are corundum, silicon carbide, zirconia, garnet, silicon nitride, quartz, etc., and the binder is usually a resin, such as phenolic resin, etc. The service life of the slurry pump flow passage piece made of the composite material can reach more than 3 times of that of Cr26 under a plurality of use conditions, but when the flow passage piece made of the material has thicker particles in a medium, the service life is shorter if the medium contains particles with the size of about 1mm and the total weight of the solid reaches more than 1 percent, and the service life can not meet the use requirements.

Ceramic material that the sintering takes shape can resist the thick liquids wearing and tearing of the particle about 1mm well, CN 205977702U discloses a heavy sediment stuff pump of carborundum, its pump body is formed by apron plate, spiral case and backplate fixed connection, be provided with carborundum ceramic inside lining group in the pump body, carborundum ceramic inside lining group is including the carborundum ceramic front liner board that is fixed in on the apron plate, the carborundum ceramic rear liner board that is fixed in on the backplate and the carborundum ceramic spiral case inner bag that is fixed in on the spiral case, carborundum ceramic front liner board, carborundum ceramic rear liner board and carborundum ceramic spiral case inner bag amalgamation form confined vortex cavity, be provided with fixed buffer layer between carborundum ceramic inside liner group and the pump body, fixed buffer layer is resin/carborundu. The pump with the structure has good performance of resisting coarse particle impact. However, this construction also has the significant disadvantage that the media can contact and abrade or corrode the metal material where the seal ring is located and cause the seal to fail. The sealing ring or the sealing gasket can be arranged at the position of the ceramic material, but the ceramic material can deform in the sintering process, even if reaction sintering silicon carbide or silicon nitride combined silicon carbide ceramic with smaller sintering deformation is adopted, the matching precision required by the sealing of the pump body and the pump cover can not be ensured by the size after sintering, for realizing reliable sealing between the rear protective plate and the volute and between the front protective plate and the volute, the front protective plate and the volute are required to be in smaller clearance fit so as to reduce the scouring of fluid on the sealing ring and the sealing ring groove, the prior art can only reserve allowance before sintering, and smaller clearance fit is realized by mechanical cutting processing after sintering. Because the hardness of the ceramic is extremely high, the machining difficulty is extremely high, the efficiency is very low, the cost is also very high, and the application range of the ceramic is greatly limited.

Disclosure of Invention

The invention aims to provide a ceramic pump body, wherein coarse particles in a medium can not directly wash out metal of a volute or a protective plate, a ceramic lining is not required to be mechanically cut in the production process, and the ceramic pump body not only has better wear resistance, but also can control the manufacturing cost within a proper range.

In order to achieve the above object, the present invention provides a ceramic pump body, which comprises a volute and a guard plate, wherein the volute comprises a shell and a volute liner; the protective plate comprises a protective plate framework and a protective plate lining, and a first buffer layer is arranged between the shell and the volute lining; the middle part of the volute is sequentially provided with a through hole and a taper hole from outside to inside, and the through hole is connected with the taper hole through a first axial end face; a second buffer layer is arranged between the guard plate framework and the guard plate lining, a shaft body and a conical shaft are sequentially arranged on the guard plate, and the shaft body is connected with the conical shaft through a second axial end face; the shaft body is matched with the through hole, and the conical shaft is matched with the conical hole; an annular space which is enclosed by the first axial end face, the second axial end face, the through hole inner wall and the conical shaft outer wall and used for placing a sealing element is arranged between the volute and the protective plate.

As a further improvement of the invention, a first wear-resistant layer with the average thickness of not less than 0.5mm is arranged on the first axial end face of the annular space, and the first wear-resistant layer is made of composite wear-resistant materials.

As a further development of the invention, the first axial end face is provided on the first damping layer, and the second axial end face and the inner circumferential side wall of the annular space are provided on the second damping layer.

As a further improvement of the invention, the fender comprises a front fender and/or a rear fender.

As a further improvement of the invention, the sealing layer with the average thickness of 0.2-2mm is arranged on the surface of the taper hole of the volute, and the sealing layer is made of composite wear-resistant materials.

As a further improvement of the invention, a second wear-resistant layer is arranged on the second axial end face of the annular space, and the second wear-resistant layer is made of composite wear-resistant materials.

As a further improvement of the invention, the conical shaft surface of the guard plate lining is provided with a sealing layer with the average thickness of 0.2-2mm, and the sealing layer is made of composite wear-resistant materials.

As a further improvement of the invention, the shell is made of metal, the inner liner of the volute is made of ceramic, and the inner liner of the guard plate is made of ceramic; the first buffer layer or the second buffer layer is made of composite wear-resistant materials partially or completely.

As a further improvement of the present invention, the material of the volute casing lining and the guard plate lining is any one of silicon nitride-bonded silicon carbide, oxide-bonded silicon carbide, nitrogen oxide-bonded silicon carbide, or reaction-sintered silicon carbide.

As a further improvement of the invention, the taper angle of the taper hole of the volute and the taper shaft of the guard plate is 3-15 degrees.

As a further improvement of the invention, the composite wear-resistant material comprises a resin binder and wear-resistant particles, and the wear-resistant particles are one of silicon carbide, silicon nitride, corundum, garnet, quartz and zirconia or a composition thereof.

As a further improvement of the invention, the volute is provided with an auxiliary through hole, and the auxiliary through hole, the through hole and the taper hole are sequentially arranged; the auxiliary through hole is connected with the through hole through the first auxiliary axial end face; the protective plate is provided with an auxiliary shaft body, the shaft body and the conical shaft are sequentially arranged, and the auxiliary shaft body is connected with the shaft body through a second auxiliary axial end face; and an auxiliary annular space for placing an auxiliary sealing element is defined by the inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end surface and the second auxiliary axial end surface.

Advantageous effects

Compared with the prior art, the ceramic pump body has the advantages that:

1. the volute liner is provided with a taper hole, the outer shell layer and/or the first buffer layer are/is provided with a through hole, the guard plate liner is provided with a taper shaft matched with the taper hole, the guard plate is provided with a shaft body matched with the through hole, and an annular space for placing a sealing element is arranged between the volute and the guard plate. A first wear resistant layer is disposed on the first axial end surface of the annular space. The die can be adopted to directly form and manufacture the taper hole and the first axial end face by the composite wear-resistant material on the pump body, the size precision of the first axial end face of the annular space can meet the requirement of matched sealing on the premise of not carrying out mechanical grinding processing on the liner of the volute made of ceramic materials, so that the mechanical grinding processing with high cost and low efficiency can be omitted in the manufacturing process of the volute, and meanwhile, the medium can be ensured not to contact with a metal part with poor corrosion resistance and wear resistance, so that the service life of the pump body is prolonged. The same effect can be achieved by providing the composite wear-resistant material with an average thickness of 0.2-2mm on the cone shaft of the rear fender or on the cone shaft of the front fender.

2. The adoption of the taper hole and the taper shaft facilitates the forming and demoulding of the ceramic piece, thereby leading the ceramic piece to have higher yield and dimensional accuracy.

3. The wear-resisting pump body comprises shell, the buffer layer of compound wear-resisting material, ceramic lining three-layer of metal material, and its advantage is as follows: the metal shell layer can improve the mechanical strength of the pump body so as to meet the strength requirement of the pump body; the composite wear-resistant material is filled between the metal shell and the volute lining completely or partially, the ceramic volute can be fixed by using a bonding agent in the composite wear-resistant material, and when the volute lining is worn out partially or cracks appear, the composite wear-resistant layer can continuously resist wear and prolong the service life of the pump.

4. If the thickness of the composite wear-resistant material sealing layer on the taper hole or the taper shaft is too thick, the composite wear-resistant material sealing layer is easily worn by coarse particles in a medium, if the thickness of the composite wear-resistant material sealing layer is too thin, the composite wear-resistant material sealing layer has no strength, and particles in the composite wear-resistant material are not easily inserted into a gap between a mold and a lining during manufacturing. When the average thickness is between 0.2 and 2mm, the two problems can be solved relatively evenly.

5. The taper angle of the taper hole and the taper shaft is 3-15 degrees, which is convenient for demoulding of the mould in the processing process.

6. The composite wear-resistant material consisting of the wear-resistant particles and the resin has good resistance to scouring wear of fine particles, but has poor resistance to scouring of coarse particles. According to the technical scheme, the lining of the sintered ceramic is arranged at the part seriously scoured by coarse particles, the composite wear-resistant material is arranged at the sealing part only scoured and abraded by fine particles, the service life of the pump body can be ensured not to be reduced as long as the thickness of the composite wear-resistant material scoured and abraded at the sealing part is controlled within a proper range, and meanwhile, the processing cost of the pump body can be obviously reduced.

7. The volute liner, the rear guard plate liner or the front guard plate liner are made of silicon nitride combined silicon carbide, oxide combined silicon carbide or reaction sintered silicon carbide, and the materials have good wear resistance and are easy to enlarge the pump.

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 sectional view of example 1;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of the backplate of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of the upper volute of FIG. 1 at A;

FIG. 5 is an enlarged view of a portion of FIG. 1 at B;

FIG. 6 is an enlarged view of a portion of the upper volute of FIG. 1 at B;

FIG. 7 is an enlarged view of a portion of the front fender at B in FIG. 1;

FIG. 8 is a sectional view of embodiment 2;

FIG. 9 is an enlarged view of a portion of FIG. 8 at C;

FIG. 10 is an enlarged view of a portion of the backplate of FIG. 8 at C;

FIG. 11 is a sectional view of embodiment 3;

FIG. 12 is an enlarged view of a portion of FIG. 11 at D;

FIG. 13 is an enlarged view of a portion of the upper volute of FIG. 11 at D;

FIG. 14 is an enlarged view of a portion of the backplate of FIG. 11 at D;

FIG. 15 is a schematic view showing the processing of the scroll of example 4;

FIG. 16 is a schematic view showing a process of manufacturing the backplate according to example 5.

Detailed Description

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

Example 1

Detailed description of the inventionreferring to fig. 1-7, a ceramic pump body includes a volute and a shroud, the volute including a housing 101 and a volute liner 102. The guard plate comprises a guard plate framework and a guard plate lining, and a first buffer layer 103 is arranged between the shell 101 and the volute casing lining 102. The middle part of the volute casing is sequentially provided with a through hole and a taper hole from outside to inside, and the through hole is connected with the taper hole through a first axial end face. Be provided with the second buffer layer between backplate skeleton and the backplate inside lining, be equipped with axis body and awl axle on the backplate in proper order, the axis body passes through second axial terminal surface and is connected with the awl axle. The shaft body is matched with the through hole, and the conical shaft is matched with the conical hole. An annular space which is enclosed by the first axial end face, the second axial end face, the through hole inner wall and the conical shaft outer wall and used for placing a sealing element is arranged between the volute and the protective plate. The inner wall of the annular space is arranged on the second buffer layer and/or the guard plate lining and is not arranged on the guard plate framework.

In this embodiment, the second buffer layer includes a second front buffer layer 303 and a second rear buffer layer 203. The first axial end face includes a first axial rearward end face 1041 and a first axial forward end face 1051. The second axial end surface includes a second rearward end surface 1042 and a second forward end surface 1052.

The backplate includes preceding backplate and backplate, and preceding backplate and backplate lock respectively are in the front side and the rear side of volute. The front guard plate comprises a front guard plate framework 301, a second front buffer layer 303 and a front guard plate lining 302 which are sequentially arranged. The backplate includes backplate skeleton 201, second back buffer layer 203 and backplate inside lining 202 arranged in proper order. Casing 101 is made of metal, volute liner 102 is made of ceramic, and backplate liner 202 is made of ceramic.

The volute liner 102 is provided with a first taper hole 10 at the rear side, and a first through hole 20 is provided in the casing 101. The first through hole 20 of the volute is connected to the first taper hole 10 through the first axial rear end surface 1041. A second rear buffer layer 203 is arranged between the backplate framework 201 and the backplate lining 202, a first taper shaft 11 matched with the first taper hole 10 is arranged on the backplate lining 202, and the maximum diameter of the first taper shaft 11 is phi 1'. The rear guard plate frame 201 is provided with a first shaft body 21 matched with the first through hole 20, and the outer diameter of the first shaft body 21 is phi 2'. The first shaft body 21 of the rear fender is connected to the first cone shaft 11 via a second axial rear end surface 1042. The first axial rearward end surface 1041 and the second axial rearward end surface 1042 are both annular. A first annular space 104 is provided between the volute and the backplate for receiving an annular seal, which may be a gasket or a seal. The first annular space 104 has an outer diameter of φ 2 and an inner diameter of φ 1'. First annular space 104 is bounded by first axial rearward end surface 1041, second axial rearward end surface 1042, first through hole 20, and an outer wall of first cone shaft 11. The first through hole 20 is a straight hole, and the first shaft body 21 is a straight shaft.

The first annular space 104 is provided with a first wear-resistant layer with an average thickness of not less than 0.5mm on the first axial rear end surface 1041 on the volute, the first wear-resistant layer is made of a composite wear-resistant material, the materials of the volute liner 102, the rear guard plate liner 202 and the front guard plate liner 302 are silicon nitride combined with silicon carbide, and the shell 101, the rear guard plate framework 201 and the front guard plate framework 301 are made of metal materials. The first buffer layer 103, the second rear buffer layer 203, and the second front buffer layer 303 are made of a cured mixture of a vinyl resin and silicon carbide particles.

In this embodiment, the front fender liner 302 is provided with a second taper shaft 31, and the maximum outer diameter of the second taper shaft 31 is Φ 3'. The front guard plate frame 301 is provided with a second shaft body 41, and the outer diameter of the second shaft body 41 is phi 4'. The second shaft body 41 of the front fender is connected to the second taper shaft 31 via a second shaft front end surface 1052. The front side of the volute liner 102 is provided with a second taper hole 30 matched with the second taper shaft 31, and the front side of the volute is also provided with a second through hole 40 matched with the second shaft body 41. The diameter of the second through-hole 40 is phi 4. The maximum diameter of the second tapered bore 30 is φ 3. The second through hole 40 of the scroll is connected to the second tapered hole 30 through the first axially forward end surface 1051. The first axial end surface 1051 and the second axial end surface 1052 are both annular. A second annular space 105 for a seal is provided between the scroll and the front plate, the second annular space having an outer diameter of phi 4 and an inner diameter of phi 3'. Second annular space 105 is bounded by first axial forward end surface 1051, second axial forward end surface 1052, the inner wall of second through bore 40 and the outer wall of second cone shaft 31. A first wear-resistant layer with an average thickness of not less than 0.5mm is arranged on the first axial front end surface 1051 of the second annular space 105, and the first wear-resistant layer is made of a composite wear-resistant material. The second through hole 40 is a straight hole, and the second shaft body 41 is a straight shaft.

In the present embodiment, the surfaces of the first and second taper holes 10, 30 of the volute are provided with a first sealing layer 106 and a fourth sealing layer 406, respectively, having an average thickness of around 0.5 mm. The first sealant layer 106 and the fourth sealant layer 406 are both made of composite abrasion resistant materials.

In the present embodiment, the surfaces of the first taper shaft 11 and the second taper shaft 31 are provided with the second sealing layer 206 and the third sealing layer 306, respectively, having an average thickness of about 0.5 mm. The second sealing layer 206 and the third sealing layer 306 are both made of composite wear-resistant materials.

In this embodiment, the second axial rear end surface 1042 of the first annular space 104 and the second axial front end surface 1052 of the second annular space 105 are both provided with a second wear-resistant layer, and the second wear-resistant layer is made of a composite wear-resistant material.

The first axially forward end surface 1051 and the first axially rearward end surface 1041 are both disposed on the first cushioning layer 103. The second axial front end surface 1052 and the inner circumferential side wall of the second annular space 105 are disposed on the second front buffer layer 303; the second axially rear end surface 1042 and an inner circumferential sidewall of the first annular space 104 are disposed on the second rear cushion layer 203.

In this embodiment, the part of the first buffer layer 103 not contacted with the fluid may also be composed of cement and aggregate particles, and the rest is composed of the composite wear-resistant material, and the purpose of this structure is to reduce the manufacturing cost.

The taper angle of the taper hole of the volute and the taper shaft of the guard plate is 3-15 degrees. The composite wear-resistant material comprises a resin binder and wear-resistant particles, wherein the wear-resistant particles comprise one or any combination of silicon carbide, corundum, garnet, silicon nitride, quartz and zirconia.

Example 2

As shown in fig. 8, 9 and 10, this embodiment is substantially the same as embodiment 1, except that no front guard is provided, the second axial rear end surface 1042 of the first annular space 104 is made of silicon carbide ceramic material, and the first conical shaft 11 is also made of silicon carbide ceramic. Obviously, the rear guard plate with the structure generally needs to be machined to meet the sealing requirement, but the machining cost is relatively low due to the fact that the rear guard plate is small and is used for machining the outer circle of the shaft, and therefore the rear guard plate can still meet the requirements of some production processes.

Example 3

As shown in fig. 11 to 14, this embodiment is substantially the same as embodiment 2, except that an auxiliary through hole is provided in the scroll, and the auxiliary through hole, the through hole and the taper hole are arranged in this order. The auxiliary through hole is connected with the through hole through the first auxiliary axial end face. Be equipped with supplementary axis body on the backplate, supplementary axis body, axis body and awl are arranged in proper order, and supplementary axis body passes through the supplementary axial terminal surface of second and is connected with the axis body. And an auxiliary annular space for placing an auxiliary sealing element is defined by the inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end surface and the second auxiliary axial end surface.

In this embodiment, the auxiliary through hole is a first auxiliary through hole 50 disposed at the rear side of the scroll, the first auxiliary through hole 50, the first through hole 20, and the first taper hole 10 are sequentially arranged, and the first auxiliary through hole 50 is connected to the first through hole 20 through a first annular auxiliary axial rear end surface 1091. Be equipped with first supplementary axis body 51 on the backplate, first supplementary axis body 51, first axis body 21 and first awl axle 11 arrange in proper order, and first supplementary axis body 51 is connected with first axis body 21 through annular second supplementary axial rear end face 1092. Wherein, first supplementary through-hole 50 sets up on casing 101, and first supplementary axial rear end 1091 sets up on first buffer layer 103, and first supplementary axis body 51 and second supplementary axial rear end 1092 all set up on backplate skeleton 201. When the rear guard plate is fastened to the rear side of the scroll casing, the first auxiliary shaft body 51 is engaged with the first auxiliary through hole 50 via a shaft hole. The inner wall of the first auxiliary through hole 50, the outer wall of the first shaft body 21, the first auxiliary axial rear end surface 1091 and the second auxiliary axial rear end surface 1092 together enclose a first auxiliary annular space 109 in which an annular seal is disposed. By providing a secondary sealing element in the first secondary annular space 109, the seal of the pump body can be maintained in the event of a failure of the sealing element in the annular space 104, thereby improving the reliability and life of the pump body.

In this embodiment, the aperture of the first auxiliary through hole 50 is phi 5, and the outer diameter of the first auxiliary shaft body 51 is phi 5'. The auxiliary annular space 109 has an outer diameter of phi 5 and an inner diameter of phi 2'.

Obviously, the reliability of the seal between the shroud and the volute can be further improved by increasing the number of auxiliary annular spaces.

In addition, the front guard plate can also be provided with an auxiliary shaft body and a second auxiliary axial end face, and the front side of the volute can also be provided with an auxiliary through hole and a first auxiliary axial end face.

Example 4

This embodiment is substantially the same as embodiment 2, and as shown in fig. 15, a schematic view of processing a first taper hole 10 and a first through hole 20 on a scroll thereof is shown, a maximum diameter of the first taper hole 10 is Φ 1, and a diameter of the first through hole 20 is Φ 2. The tooling die 108 is manufactured firstly, and a third taper shaft and a third shaft body are arranged on the tooling die, wherein the size of the third taper shaft is the same as that of the first taper hole 10, and the size of the third shaft body is the same as that of the first through hole 20. The shell 101 and the volute liner 102 are placed on a tooling die 108, and the composite wear-resistant material is added into a cavity 107 between the shell 101 and the volute liner 102. After the composite wear-resistant material is hardened, the first buffer layer 103, the first taper hole 10 and the first through hole 20 are formed, and the first sealing layer 106 and the first axial rear end surface 1041 are formed.

Example 5

This embodiment is substantially the same as embodiment 1, and fig. 16 is a schematic view showing the processing of the first cone shaft 11 and the first shaft body 21 on the rear fender. The tooling die 208 is manufactured first, and the sizes of the fourth taper hole and the fourth through hole arranged on the tooling die 208 are respectively the same as those of the first taper shaft 11 and the first shaft body 21. The rear guard plate framework 201 and the rear guard plate lining 202 are placed in a tooling die 208, and a composite wear-resistant material is added between the rear guard plate framework 201 and the rear guard plate lining 202. After hardening, the first cone shaft 11 and the first shaft body 21 are machined on the backplate, and the second sealant 206 and the second rear end surface 1042 are also formed.

Obviously, in the above embodiments, the first through hole 20 and/or the second through hole 40 of the volute are/is provided as a taper hole, and the first shaft body 21 of the rear guard plate and/or the second shaft body 41 of the rear guard plate are/is provided as a taper shaft, or the auxiliary through hole is replaced by a taper hole and the auxiliary shaft body is replaced by a taper shaft, the same effect can be achieved, and thus the present invention is also covered.

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 ceramic pump body comprising a volute and a shroud, the volute comprising a casing (101) and a volute liner (102); the protective plate comprises a protective plate framework and a protective plate lining, and is characterized in that a first buffer layer (103) is arranged between the shell (101) and the volute casing lining (102); the middle part of the volute is sequentially provided with a through hole and a taper hole from outside to inside, and the through hole is connected with the taper hole through a first axial end face; a second buffer layer is arranged between the guard plate framework and the guard plate lining, a shaft body and a conical shaft are sequentially arranged on the guard plate, and the shaft body is connected with the conical shaft through a second axial end face; the shaft body is matched with the through hole, and the conical shaft is matched with the conical hole; an annular space which is enclosed by the first axial end face, the second axial end face, the through hole inner wall and the conical shaft outer wall and used for placing a sealing element is arranged between the volute and the protective plate.

2. The ceramic pump body of claim 1, wherein the first axial end surface of the annular space is provided with a first wear layer having an average thickness of not less than 0.5mm, the first wear layer being a composite wear resistant material.

3. A ceramic pump body according to claim 1 or 2, wherein the first axial end face is provided on a first buffer layer (103), and the second axial end face and the inner circumferential side wall of the annular space are provided on a second buffer layer.

4. The ceramic pump body according to claim 1, wherein the shield comprises a front shield and/or a rear shield.

5. The ceramic pump body as set forth in claim 1, wherein the surface of the tapered hole of the volute is provided with a sealing layer having an average thickness of 0.2-2mm, the sealing layer being made of a composite wear-resistant material.

6. The ceramic pump body of claim 1, wherein a second wear layer is disposed on a second axial end surface of the annular space, the second wear layer being a composite wear resistant material.

7. The ceramic pump body of claim 1, wherein the tapered surface of the shield liner is provided with a sealing layer having an average thickness of 0.2-2mm, the sealing layer being a composite wear-resistant material.

8. The ceramic pump body according to claim 1, wherein the housing (101) is made of metal, the volute liner (102) is made of ceramic, and the shield liner is made of ceramic; the first buffer layer (103) or the second buffer layer is partially or completely made of composite wear-resistant materials.

9. A ceramic pump body according to claim 2, 5, 6, 7 or 8, wherein the composite wear-resistant material comprises a resin binder and wear-resistant particles, and the wear-resistant particles comprise one of silicon carbide, corundum, garnet, silicon nitride, quartz, zirconia or any combination thereof.

10. The ceramic pump body according to claim 1, wherein the volute is provided with an auxiliary through hole, and the auxiliary through hole, the through hole and the taper hole are sequentially arranged; the auxiliary through hole is connected with the through hole through the first auxiliary axial end face; the protective plate is provided with an auxiliary shaft body, the shaft body and the conical shaft are sequentially arranged, and the auxiliary shaft body is connected with the shaft body through a second auxiliary axial end face; and an auxiliary annular space for placing an auxiliary sealing element is defined by the inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end surface and the second auxiliary axial end surface.