WO2021109625A1

WO2021109625A1 - Ceramic pump body

Info

Publication number: WO2021109625A1
Application number: PCT/CN2020/110853
Authority: WO
Inventors: 肖琼
Original assignee: 广州市拓道新材料科技有限公司
Priority date: 2019-12-06
Filing date: 2020-08-24
Publication date: 2021-06-10
Also published as: CN112922902A

Abstract

A ceramic pump body, comprising a volute and a guard plate. The volute comprises a housing (101) and a volute lining (102). The guard plate comprises a guard plate frame (201 and 301) and a guard plate lining (202 and 302). A first cushioning layer (103) is provided between the housing (101) and the volute lining (102). A second cushioning layer (203 and 303) is provided between the guard plate frame (201 and 301) and the guard plate lining (202 and 302). A through hole (20 and 40) and a tapered hole (10 and 30) are provided sequentially inwards at the middle part of the volute. The through hole is connected to the tapered hole via a first axial end surface (1041 and 1051). A shaft (21 and 41) and a tapered shaft (11 and 31) are sequentially provided on the guard plate. The shaft is connected to the tapered shaft via a second axial end surface (1042 and 1052). The shaft mates with the through hole; the tapered shaft mates with the tapered hole. An annular space (104 and 105) formed by joining the first axial end surface, the second axial end surface, the inner wall of the through hole, and the outer wall of the tapered shaft and used for placing a sealing element is provided between the volute and the guard plate. The ceramic pump body is provided with improved wear resistance and corrosion resistance, and the manufacturing costs therefor can be controlled in a suitable range.

Description

A ceramic pump body

Technical field

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

Background technique

In industries such as beneficiation and smelting, centrifugal pumps are often used to transport some abrasive solid-liquid two-phase flows, and slurry pumps are often used at this time. Common slurry pumps are usually made of wear-resistant alloys such as Cr26 and Cr15Mo3. Slurry pumps made of these wear-resistant materials are difficult to meet the requirements of use under many working conditions. The main problems are as follows: 1) The wear problem is prominent, and the service life of the flow parts often cannot meet the requirements of use; 2) The anti-cavitation performance is poor. This is because as the concentration of the two-phase flow increases, the fluidity of the medium continues to decrease, and the cavitation margin is much smaller than that of clean water. As a result, cavitation occurs when the flow rate of the pump is much smaller than the calibrated value. Not only is the flow part easily damaged, but the pump The performance such as efficiency, head, flow rate, etc. are all significantly reduced.

The use of composite wear-resistant materials can achieve better wear resistance, and these composite wear-resistant materials are mainly composed of wear-resistant particles and binders. The most common wear-resistant particles are made of corundum, silicon carbide, zirconia, garnet, silicon nitride, quartz, etc. The binder is usually resin, such as phenolic resin. The service life of the slurry pump wetted parts made of this kind of composite material can reach more than 3 times of Cr26 under many use conditions, but the wetted parts made of this material have coarser particles in the medium, such as the medium contains When the particles of about 1mm reach more than 1% of the total weight of the solid, the service life is short, and the service life often cannot meet the requirements of use.

The sintered ceramic material can well resist the slurry wear of particles of about 1mm. CN 205977702 U discloses a silicon carbide heavy-duty slurry pump, the pump body is fixedly connected by a front guard plate, a volute and a rear guard plate The pump body is provided with a silicon carbide ceramic lining group. The silicon carbide ceramic lining group includes a silicon carbide ceramic front lining plate fixed on the front guard plate, a silicon carbide ceramic back lining plate fixed on the rear guard plate, and a fixed The silicon carbide ceramic volute liner on the volute, the silicon carbide ceramic front liner, the silicon carbide ceramic back liner and the silicon carbide ceramic volute liner are combined to form a closed vortex cavity, the silicon carbide ceramic liner group and the pump A fixed buffer layer is arranged between the bodies, and the fixed buffer layer is a resin/silicon carbide composite material. The pump of this structure has good resistance to the impact of coarse particles. However, this structure also has obvious shortcomings. The medium will contact the metal material at the location of the sealing ring and cause abrasion or corrosion to it, and make the seal ineffective. The sealing ring or gasket can also be set at the place where the ceramic material is located, but the ceramic material will be deformed during the sintering process, even if the reaction sintered silicon carbide or silicon nitride bonded silicon carbide ceramic with a small amount of sintering deformation is used, after sintering The size of the pump body still cannot guarantee the matching accuracy required for the sealing of the pump body and the pump cover. In order to achieve reliable sealing between the rear guard plate and the volute, and between the front guard plate and the volute, the front guard plate and the volute should be There is a small clearance fit between the rear guard plate and the volute to reduce the erosion of the seal ring and the seal ring groove by the fluid. The prior art can only reserve a margin before sintering, and pass the mechanical process after sintering. Cutting to achieve a smaller clearance fit. Due to the extremely high hardness of ceramics, the mechanical processing is extremely difficult, not only the efficiency is very low, but the cost is also high, which greatly limits the scope of its application.

Summary of the invention

The purpose of the present invention is to provide a ceramic pump body, the coarse particles in the medium will not be directly washed to the metal of the volute or the protective plate, and there is no need to perform mechanical cutting of the ceramic lining during the production process, which not only has better resistance Abrasiveness, and the manufacturing cost can be controlled in an appropriate range.

In order to achieve the above objective, the present invention provides a ceramic pump body, including a volute and a protective plate, the volute includes a casing and a volute lining; the protective plate includes a protective plate frame and a protective plate lining, the casing and the volute A first buffer layer is arranged between the liners; a through hole and a tapered hole are arranged in the middle of the volute from the outside to the inside, and the through hole is connected with the tapered hole through the first axial end surface; In the second buffer layer, a shaft body and a cone shaft are arranged on the guard plate in sequence, and the shaft body is connected with the cone shaft through the second axial end surface; the shaft body is matched with the through hole, and the cone shaft is matched with the cone hole; between the volute and the guard plate There is an annular space surrounded by the first axial end surface, the second axial end surface, the inner wall of the through hole and the outer wall of the tapered shaft for placing the sealing element.

As a further improvement of the present invention, the first axial end surface of the annular space is provided with a first wear-resistant layer with an average thickness of not less than 0.5 mm, and the first wear-resistant layer is a composite wear-resistant material.

As a further improvement of the present invention, the first axial end surface is arranged on the first buffer layer, and the second axial end surface and the inner circumferential side wall of the annular space are arranged on the second buffer layer.

As a further improvement of the present invention, the guard plate includes a front guard plate and/or a rear guard plate.

As a further improvement of the present invention, the surface of the cone hole of the volute is provided with a sealing layer with an average thickness of 0.2-2 mm, and the sealing layer is made of a composite wear-resistant material.

As a further improvement of the present invention, a second wear-resistant layer is provided on the second axial end surface of the annular space, and the second wear-resistant layer is a composite wear-resistant material.

As a further improvement of the present invention, the tapered shaft surface of the protective plate lining is provided with a sealing layer with an average thickness of 0.2-2 mm, and the sealing layer is made of a composite wear-resistant material.

As a further improvement of the present invention, the housing is made of metal, the inner lining of the volute is made of ceramic, and the inner lining of the protective plate is made of ceramic; part or all of the first buffer layer or the second buffer layer The material is composite wear-resistant material.

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

As a further improvement of the present invention, the cone angles of the cone hole of the volute and the cone axis of the guard plate are 3-15°.

As a further improvement of the present invention, the composite wear-resistant material includes a resin bond and wear-resistant particles, and the wear-resistant particles are one of silicon carbide, silicon nitride, corundum, garnet, quartz, zirconia, or combination.

As a further improvement of the present invention, an auxiliary through hole is provided on the volute, and the auxiliary through hole, the through hole and the tapered hole are arranged in sequence; the auxiliary through hole is connected with the through hole through the first auxiliary axial end surface; The guard plate is provided with an auxiliary shaft body, the auxiliary shaft body, the shaft body and the tapered shaft are arranged in sequence, and the auxiliary shaft body is connected with the shaft body through the second auxiliary axial end surface; the inner wall of the auxiliary through hole, the outer wall of the shaft, and the first auxiliary The axial end surface and the second auxiliary axial end surface enclose an auxiliary annular space where the auxiliary seal is placed.

Beneficial effect

Compared with the prior art, the advantages of the ceramic pump body of the present invention are:

1. A cone hole is provided on the inner lining of the volute, a through hole is provided on the outer shell layer and/or the first buffer layer, and a cone shaft that matches the cone hole is provided on the inner lining of the protective plate, and is arranged on the protective plate A shaft body matched with a through hole is provided, and an annular space for placing a sealing element is arranged between the volute and the guard plate. A first wear-resistant layer is provided on the first axial end surface of the annular space. In this way, the composite wear-resistant material can be directly formed on the pump body to produce the tapered hole and the first axial end surface by using the mold, and the annular space can be made first without mechanically grinding the ceramic volute lining. The dimensional accuracy of the axial end face meets the requirements of the seal, so that the manufacturing process of the volute can eliminate the costly and inefficient mechanical grinding process, and at the same time, it can ensure that the medium does not contact the metal parts with poor corrosion resistance and wear resistance. Extend the service life of the pump body. The same effect can be achieved by arranging a composite wear-resistant material with an average thickness of 0.2-2mm on the cone shaft of the rear guard plate or on the cone shaft of the front guard plate.

2. The use of tapered holes and tapered shafts facilitates the forming and demolding of ceramic parts, so that the ceramic parts have a higher yield and dimensional accuracy.

3. The wear-resistant pump body is composed of a metal shell, a composite wear-resistant material buffer layer, and a ceramic lining. Its advantages are as follows: The metal shell layer can improve the mechanical strength of the pump body to meet the strength requirements of the pump body; The composite wear-resistant material is completely or partially filled between the metal shell and the inner lining of the volute. The bonding agent in the composite wear-resistant material can be used to fix the ceramic volute. When the inner lining of the volute is partially worn out or cracks appear, the composite wear-resistant The abrasive layer can continue to resist wear and extend the life of the pump.

4. If the sealing layer of the composite wear-resistant material on the tapered hole or the tapered shaft is too thick, it will be easily worn by the coarse particles in the medium, if it is too thin, it will have no strength, and the particles in the composite wear-resistant material will not easily enter the mold and the inside during manufacturing. The gap between the linings. When the average thickness is between 0.2-2mm, the above two problems can be solved in a balanced manner.

5. The taper angle of the taper hole and taper shaft is 3-15°, which is convenient for mold release during processing.

6. The composite wear-resistant material composed of wear-resistant particles and resin has good resistance to scouring and abrasion of fine particles, but poor resistance to scouring of coarse particles. In this technical solution, the sintered ceramic lining is set on the part that is severely scoured by coarse particles, and the composite wear-resistant material is set on the sealing part that is only eroded and worn by fine particles. As long as the sealing part is scoured and worn by the composite wear-resistant material The thickness of the pump body is controlled in an appropriate range to ensure that the life of the pump body is not reduced, and at the same time, the processing cost of the pump body can be significantly reduced.

7. The material of the volute inner lining, rear guard inner lining or front guard inner lining is silicon nitride bonded silicon carbide, oxide bonded silicon carbide or reaction sintered silicon carbide. These materials have good wear resistance and are easy to Larger pumps.

The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is a cross-sectional view of Embodiment 1;

Figure 2 is a partial enlarged view of Figure 1 at A;

Figure 3 is a partial enlarged view of the upper rear guard plate in Figure 1 at A;

Fig. 4 is a partial enlarged view of the volute in Fig. 1 at A;

Figure 5 is a partial enlarged view of Figure 1 at B;

Fig. 6 is a partial enlarged view of the volute at B in Fig. 1;

Figure 7 is a partial enlarged view of the front guard plate at B in Figure 1;

Figure 8 is a cross-sectional view of Embodiment 2;

Figure 9 is a partial enlarged view of Figure 8 at C;

Fig. 10 is a partial enlarged view of the upper rear guard plate in Fig. 8 at C;

Figure 11 is a cross-sectional view of Embodiment 3;

Figure 12 is a partial enlarged view of Figure 11 at D;

Fig. 13 is a partial enlarged view of the volute at D in Fig. 11;

Figure 14 is a partial enlarged view of the upper rear guard plate in Figure 11 at D;

FIG. 15 is a schematic diagram of the processing process of the volute in embodiment 4;

FIG. 16 is a schematic diagram of the processing process of the rear guard plate of Embodiment 5. FIG.

Detailed ways

The embodiments of the present invention will now be described with reference to the drawings.

Example 1

The specific embodiment 1 of the present invention is shown in Figs. 1-7. A ceramic pump body includes a volute and a guard plate. The volute includes a casing 101 and a volute lining 102. The protective plate includes a protective plate frame and a protective plate inner liner, and a first buffer layer 103 is arranged between the shell 101 and the volute inner liner 102. A through hole and a tapered hole are successively provided in the middle of the volute from the outside to the inside, and the through hole is connected with the tapered hole through the first axial end surface. A second buffer layer is arranged between the protective plate skeleton and the protective plate lining, the protective plate is sequentially provided with a shaft body and a cone shaft, and the shaft body is connected with the cone shaft through a second axial end surface. The shaft body is matched with the through hole, and the tapered shaft is matched with the tapered hole. Between the volute and the protective plate is provided an annular space for placing the sealing element enclosed by the first axial end surface, the second axial end surface, the inner wall of the through hole and the outer wall of the cone shaft. The inner wall of the annular space is arranged on the second buffer layer and/or the protective plate lining, but not on the protective plate skeleton.

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 surface includes a first axial rear end surface 1041 and a first axial front end surface 1051. The second axial end surface includes a second axial rear end surface 1042 and a second axial front end surface 1052.

The guard plate includes a front guard plate and a rear guard plate. The front guard plate and the rear guard plate are respectively fastened on the front side and the rear side of the volute. The front fender includes a front fender frame 301, a second front buffer layer 303 and a front fender lining 302 arranged in sequence. The rear apron includes a rear apron frame 201, a second rear buffer layer 203 and a rear apron lining 202 arranged in sequence. The housing 101 is made of metal, the volute lining 102 is made of ceramic, and the back guard plate lining 202 is made of ceramic.

The back side of the volute liner 102 is provided with a first cone hole 10, and the housing 101 is provided with a first through hole 20. 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 provided between the rear apron frame 201 and the rear apron lining 202, and a first taper shaft 11 that cooperates with the first taper hole 10 is provided on the rear apron lining 202. The maximum diameter of the tapered shaft 11 is φ1'. A first shaft body 21 that fits with the first through hole 20 is provided on the rear fender frame 201, and the outer diameter of the first shaft body 21 is φ2'. The first shaft body 21 on the rear guard plate is connected to the first taper shaft 11 through the second axial rear end surface 1042. Both the first axial rear end surface 1041 and the second axial rear end surface 1042 are annular. A first annular space 104 in which an annular seal is placed is provided between the volute and the rear guard plate. The seal is a gasket or a sealing ring. The outer diameter of the first annular space 104 is φ2, and the inner diameter is φ1'. The first annular space 104 is enclosed by a first axial rear end surface 1041, a second axial rear end surface 1042, a first through hole 20 and an outer wall of the first tapered shaft 11. The first through hole 20 is a straight hole, and the first shaft body 21 is a straight shaft.

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

In this embodiment, the front fender lining 302 is provided with a second tapered shaft 31, and the maximum outer diameter of the second tapered shaft 31 is φ3'. A second shaft 41 is provided on the front fender frame 301, and the outer diameter of the second shaft 41 is φ4'. The second shaft body 41 of the front fender is connected to the second tapered shaft 31 through a second axial front end surface 1052. A second taper hole 30 is provided on the front side of the volute lining 102 to cooperate with the second taper shaft 31, and a second through hole 40 that is matched with the second shaft body 41 is also provided on the front side of the volute casing. The diameter of the second through hole 40 is φ4. The maximum diameter of the second taper hole 30 is φ3. The second through hole 40 of the volute is connected to the second taper hole 30 through the first axial front end surface 1051. Both the first axial front end surface 1051 and the second axial front end surface 1052 are annular. A second annular space 105 for placing a seal is provided between the volute and the front guard. The outer diameter of the second annular space is φ4 and the inner diameter is φ3'. The second annular space 105 is surrounded by a first axial front end surface 1051, a second axial front end surface 1052, an inner wall of the second through hole 40, and an outer wall of the second taper shaft 31. The first axial front end surface 1051 of the second annular space 105 is provided with a first wear-resistant layer with an average thickness of not less than 0.5 mm, and the first wear-resistant layer is 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 this embodiment, the surfaces of the first cone hole 10 and the second cone hole 30 of the volute are respectively provided with a first sealing layer 106 and a fourth sealing layer 406 with an average thickness of about 0.5 mm. The first sealing layer 106 and the fourth sealing layer 406 are both composite wear-resistant materials.

In this embodiment, the surfaces of the first tapered shaft 11 and the second tapered shaft 31 are respectively provided with a second sealing layer 206 and a third sealing layer 306 with an average thickness of about 0.5 mm. The second sealing layer 206 and the third sealing layer 306 are both 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 a composite Wear-resistant material.

The first axial front end surface 1051 and the first axial rear end surface 1041 are both disposed on the first buffer layer 103. The second axial front end surface 1052 and the inner circumferential side wall of the second annular space 105 are arranged on the second front buffer layer 303; the second axial rear end surface 1042 and the inner circumferential side wall of the first annular space 104 are arranged on the second On the back buffer layer 203.

In this embodiment, the part of the first buffer layer 103 that is not in contact with fluid may also be composed of cement and aggregate particles, and the remaining part is composed of composite wear-resistant materials. The purpose of this structure is to reduce manufacturing costs.

The cone angle of the cone hole of the volute and the cone axis of the guard plate is 3-15°. The composition of the composite wear-resistant material includes a resin bond and wear-resistant particles, and the wear-resistant particles include one or any combination of silicon carbide, corundum, garnet, silicon nitride, quartz, and zirconia.

Example 2

As shown in Figures 8, 9, and 10, this embodiment is roughly the same as Embodiment 1, except that there is no front guard plate, and the second axial rear end surface 1042 of the first annular space 104 is made of silicon carbide ceramic material. , The material of the first taper shaft 11 is also silicon carbide ceramic. Obviously, the rear guard plate of this structure generally needs to be mechanically cut to meet the sealing requirements, but because the size of the rear guard plate is small and the outer circle of the machined shaft, the cost of this mechanical cutting is relatively low, so It can still meet the requirements of some production processes.

Example 3

As shown in Figs. 11 to 14, this embodiment is substantially the same as the second embodiment, except that an auxiliary through hole is provided on the volute, and the auxiliary through hole, the through hole and the tapered hole are arranged in sequence. The auxiliary through hole is connected with the through hole through the first auxiliary axial end surface. The guard plate is provided with an auxiliary shaft body, the auxiliary shaft body, the shaft body and the cone shaft are arranged in sequence, and the auxiliary shaft body is connected with the shaft body through the second auxiliary axial end surface. 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 enclose an auxiliary annular space where the auxiliary seal is placed.

In this embodiment, the auxiliary through hole is the first auxiliary through hole 50, which is arranged on the rear side of the volute. The first auxiliary through hole 50, the first through hole 20 and the first tapered hole 10 are arranged in sequence, and the first auxiliary through hole The hole 50 is connected to the first through hole 20 through a ring-shaped first auxiliary axial rear end surface 1091. The rear guard plate is provided with a first auxiliary shaft body 51, the first auxiliary shaft body 51, the first shaft body 21 and the first tapered shaft 11 are arranged in sequence, and the first auxiliary shaft body 51 passes through the annular second auxiliary axial rear end surface 1092 is connected to the first shaft body 21. Wherein, the first auxiliary through hole 50 is provided on the housing 101, the first auxiliary axial rear end surface 1091 is provided on the first buffer layer 103, the first auxiliary shaft body 51 and the second auxiliary axial rear end surface 1092 are both provided on The rear guard plate frame 201 is on. When the rear guard plate is buckled on the rear side of the volute, the first auxiliary shaft body 51 and the first auxiliary through hole 50 are shaft hole fits. 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 jointly enclose the first auxiliary annular space 109 where the annular seal is placed. By arranging the auxiliary sealing element in the first auxiliary annular space 109, the seal of the pump body can be maintained even when the sealing element in the annular space 104 fails, thereby improving the reliability of the pump body and prolonging its life.

In this embodiment, the aperture of the first auxiliary through hole 50 is φ5, and the outer diameter of the first auxiliary shaft 51 is φ5'. The outer diameter of the auxiliary annular space 109 is φ5, and the inner diameter is φ2'.

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

In addition, the front fender may also be provided with an auxiliary shaft body and a second auxiliary axial end surface, and the front side of the scroll casing may also be provided with an auxiliary through hole and a first auxiliary axial end surface.

Example 4

This embodiment is roughly the same as the second embodiment. Figure 15 shows the processing schematic diagram of the first taper hole 10 and the first through hole 20 on the volute. The maximum diameter of the first taper hole 10 is φ1, and the first through hole 20 The diameter is φ2. First, a tooling mold 108 is made, and a third cone shaft and a third shaft body are set thereon. The third cone shaft has the same size as the first cone hole 10, and the third shaft body has the same size as the first through hole 20. The shell 101 and the volute lining 102 are placed on the tooling mold 108, and a composite wear-resistant material is added to the cavity 107 between the shell 101 and the volute lining 102. After the composite wear-resistant material is hardened, the first buffer layer 103 will be formed. At the same time, the first tapered hole 10 and the first through hole 20 will be formed. At the same time, the first sealing layer 106 and the first axial rear end surface will also be formed. 1041. Since the deformation of the composite wear-resistant material after hardening is extremely small, several mating surfaces that meet the sealing requirements can be manufactured without mechanical cutting.

Example 5

This implementation is almost the same as the first embodiment. FIG. 16 shows a schematic diagram of the processing of the first taper shaft 11 and the first shaft body 21 on the rear guard plate. First, the tooling mold 208 is manufactured, and the sizes of the fourth taper hole and the fourth through hole provided on the tooling mold 208 are the same as the first taper shaft 11 and the first shaft body 21 respectively. Put the back fender frame 201 and the back fender lining 202 into the tooling mold 208, and add a composite wear-resistant material between the back fender frame 201 and the back fender lining 202. After being hardened, the first tapered shaft 11 and the first shaft body 21 will be machined on the rear guard plate, and the second sealing layer 206 and the second axial rear end surface 1042 will also be formed at the same time.

Obviously, in the above several embodiments, the first through hole 20 and/or the second through hole 40 of the volute are set as cone holes, and the first shaft body 21 of the rear guard plate and/or the rear guard plate The second shaft body 41 is configured as a tapered shaft, or the auxiliary through hole is replaced with a tapered hole, and the auxiliary shaft body is replaced with a tapered shaft, the same effect can also be achieved, so it is also the coverage of the present invention.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

A ceramic pump body includes a volute and a protective plate, the volute includes a casing (101) and a volute lining (102); the protective plate includes a protective plate frame and a protective plate lining, characterized in that the casing (101) A first buffer layer (103) is arranged between) and the inner lining (102) of the volute; the middle part of the volute is successively provided with a through hole and a tapered hole from the outside to the inside, and the through hole is connected with the tapered hole through the first axial end surface; A second buffer layer is arranged between the plate skeleton and the protective plate lining. The protective plate is sequentially provided with a shaft body and a cone shaft. The shaft body is connected with the cone shaft through the second axial end surface; the shaft body is matched with the through hole and the cone shaft It is matched with the cone hole; an annular space for placing the seal is surrounded by the first axial end surface, the second axial end surface, the inner wall of the through hole and the outer wall of the cone shaft between the volute and the protective plate.
The ceramic pump body according to claim 1, wherein the first axial end surface of the annular space is provided with a first wear-resistant layer with an average thickness of not less than 0.5mm, and the first wear-resistant layer is a composite Wear-resistant material.
The ceramic pump body according to claim 1 or 2, wherein the first axial end surface is disposed on the first buffer layer (103), and the second axial end surface and the inner circumference of the annular space The sidewall is arranged on the second buffer layer.
The ceramic pump body according to claim 1, wherein the protective plate comprises a front protective plate and/or a rear protective plate.
The ceramic pump body according to claim 1, wherein the surface of the cone hole of the volute is provided with a sealing layer with an average thickness of 0.2-2 mm, and the sealing layer is made of a composite wear-resistant material.
The ceramic pump body according to claim 1, wherein a second wear-resistant layer is provided on the second axial end surface of the annular space, and the second wear-resistant layer is a composite wear-resistant material.
The ceramic pump body according to claim 1, wherein the tapered shaft surface of the protective plate lining is provided with a sealing layer with an average thickness of 0.2-2 mm, and the sealing layer is made of composite wear-resistant material.
The ceramic pump body according to claim 1, wherein the casing (101) is made of metal, the inner lining (102) of the volute is made of ceramic, and the inner lining of the protective plate is made of ceramic Part or all of the first buffer layer (103) or the second buffer layer is made of composite wear-resistant materials.
A ceramic pump body according to claim 2, 5, 6, 7 or 8, wherein the composition of the composite wear-resistant material includes a resin bond and wear-resistant particles, and the wear-resistant particles include silicon carbide , Corundum, garnet, silicon nitride, quartz, zirconia or any combination thereof.
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 tapered hole are arranged in sequence; the auxiliary through hole passes through the first auxiliary shaft The end face is connected with the through hole; the protective plate is provided with an auxiliary shaft body, the auxiliary shaft body, the shaft body and the tapered shaft are arranged in sequence, and the auxiliary shaft body is connected with the shaft body through the second auxiliary axial end face; the auxiliary through hole The inner wall, the outer wall of the shaft body, the first auxiliary axial end surface and the second auxiliary axial end surface enclose an auxiliary annular space where the auxiliary seal is placed.