A ceramic pump body

Abstract

The present invention discloses a ceramic pump body, including a volute and a guard plate, the volute includes a shell and a volute liner; the guard plate includes a guard plate frame and a guard plate liner, and a first buffer layer is arranged between the shell and the volute liner; a through hole and a tapered hole are arranged in sequence from the outside to the inside in the middle of the volute, and the through hole is connected to the tapered hole through a first axial end face; a second buffer layer is arranged between the guard plate frame and the guard plate liner, and a shaft body and a tapered shaft are arranged in sequence on the guard plate, and the shaft body is connected to the tapered shaft through a second axial end face; the shaft body cooperates with the through hole, and the tapered shaft cooperates with the tapered hole; an annular space for placing a seal is arranged between the volute and the guard plate, which is surrounded by the first axial end face, the second axial end face, the inner wall of the through hole and the outer wall of the tapered shaft. In the ceramic pump body provided by the present invention, the medium will not contact the metal parts of the volute or the guard plate, and it not only has good wear resistance and corrosion resistance, but also the manufacturing cost can be controlled within a suitable range.

Description

Technical Field

[0001] The invention relates to the field of rotary power pump equipment, in particular to a ceramic pump body. Background Art

[0002] In the mineral processing and smelting industries, centrifugal pumps are often used to transport some abrasive solid-liquid two-phase flows. Slurry pumps are often used in this case. Common slurry pumps are often made of wear-resistant alloys such as Cr26 and Cr15Mo3. Slurry pumps made of these wear-resistant materials are difficult to meet the use requirements under many working conditions. The main problems are as follows: 1) The wear problem is prominent, and the life of the flow parts often cannot meet the use requirements; 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, resulting in cavitation when the pump flow is far less than the calibration value. Not only are the flow parts easily damaged, but the performance of the pump, such as efficiency, head, flow, etc., are also significantly reduced.

[0003] The use of composite wear-resistant materials can achieve better wear resistance. 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, zirconium oxide, garnet, silicon nitride, quartz, etc. The binder is usually a resin, such as phenolic resin. The service life of the slurry pump flow parts made of this type of composite material can reach more than 3 times that of Cr26 under many conditions of use. However, when the flow parts made of this material have coarser particles in the medium, such as when the medium contains particles of about 1mm that reach more than 1% of the total weight of the solid, the service life is shorter and often cannot meet the use requirements.

[0004] Sintered ceramic materials can well resist the slurry wear of particles of about 1mm. CN 205977702U discloses a silicon carbide heavy-duty slurry pump, whose pump body is fixedly connected by a front guard plate, a volute and a rear guard plate. A silicon carbide ceramic lining group is arranged in the pump body. The silicon carbide ceramic lining group includes a silicon carbide ceramic front lining plate fixed on the front guard plate, a silicon carbide ceramic rear lining plate fixed on the rear guard plate and a silicon carbide ceramic volute liner fixed on the volute. The silicon carbide ceramic front lining plate, the silicon carbide ceramic rear lining plate and the silicon carbide ceramic volute liner are assembled to form a closed vortex cavity. A fixed buffer layer is arranged between the silicon carbide ceramic lining group and the pump body, and the fixed buffer layer is a resin / silicon carbide composite material. The pump of this structure has good performance in resisting the impact of coarse particles. However, this structure also has obvious disadvantages. The medium will contact the metal material where the sealing ring is located and cause abrasion or corrosion to it, and make the seal ineffective. Sealing rings or gaskets can also be set in the position where the ceramic material is located, but the ceramic material will deform during the sintering process. Even if the reaction-sintered silicon carbide or silicon nitride combined with silicon carbide ceramics with a small sintering deformation is used, the size after sintering still cannot guarantee the matching accuracy required for the pump body and pump cover seal. 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, and between the rear guard plate and the volute should be matched with a smaller gap to reduce the scouring of the fluid on the sealing ring and the sealing ring groove. For this purpose, the existing technology can only reserve a margin before sintering, and achieve a smaller gap fit by mechanical cutting after sintering. Due to the extremely high hardness of ceramics, mechanical processing is extremely difficult, not only the efficiency is very low, but also the cost is very high, which greatly limits its scope of application. Summary of the invention

[0005] The purpose of the present invention is to provide a ceramic pump body, in which coarse particles in the medium will not directly wash onto the metal of the volute or guard plate, and there is no need to perform mechanical cutting on the ceramic lining during the production process. It not only has good wear resistance, but also the manufacturing cost can be controlled within an appropriate range.

[0006] To achieve the above-mentioned purpose, the present invention provides a ceramic pump body, including a volute and a guard plate, the volute including a shell and a volute liner; the guard plate includes a guard plate frame and a guard plate liner, and a first buffer layer is arranged between the shell and the volute liner; the middle part of the volute is provided with a through hole and a tapered hole in sequence from the outside to the inside, and the through hole is connected to the tapered hole through a first axial end face; a second buffer layer is arranged between the guard plate frame and the guard plate liner, and a shaft body and a tapered shaft are arranged on the guard plate in sequence, and the shaft body is connected to the tapered shaft through a second axial end face; the shaft body cooperates with the through hole, and the tapered shaft cooperates with the tapered hole; an annular space for placing a seal is arranged between the volute and the guard plate, which is surrounded by the first axial end face, the second axial end face, the inner wall of the through hole and the outer wall of the tapered shaft.

[0007] As a further improvement of the present invention, a first wear-resistant layer with an average thickness of not less than 0.5 mm is provided on the first axial end surface of the annular space, and the first wear-resistant layer is a composite wear-resistant material.

[0008] As a further improvement of the present invention, the first axial end face is arranged on a first buffer layer, and the second axial end face and the inner circumferential side wall of the annular space are arranged on a second buffer layer.

[0009] As a further improvement of the present invention, the guard plate includes a front guard plate and / or a rear guard plate.

[0010] As a further improvement of the present invention, a sealing layer with an average thickness of 0.2-2 mm is provided on the surface of the tapered hole of the volute, and the sealing layer is made of a composite wear-resistant material.

[0011] 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.

[0012] As a further improvement of the present invention, the conical shaft surface of the guard 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.

[0013] As a further improvement of the present invention, the shell is made of metal, the volute lining is made of ceramic material, and the guard plate lining is made of ceramic material; the first buffer layer or the second buffer layer is partially or entirely made of composite wear-resistant material.

[0014] As a further improvement of the present invention, the material of the volute lining and the guard plate lining is any one of silicon nitride bonded to silicon carbide, oxide bonded to silicon carbide, oxynitride bonded to silicon carbide or reaction-sintered silicon carbide.

[0015] 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°.

[0016] As a further improvement of the present 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, zirconium oxide or a combination thereof.

[0017] As a further improvement of the present invention, an auxiliary through hole is provided on the volute, and the auxiliary through hole, through hole and tapered hole are arranged in sequence; the auxiliary through hole is connected to the through hole through a first auxiliary axial end face; an auxiliary shaft body is provided on the guard plate, and the auxiliary shaft body, shaft body and tapered shaft are arranged in sequence, and the auxiliary shaft body is connected to the shaft body through a second auxiliary axial end face; the inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end face and the second auxiliary axial end face form an auxiliary annular space for placing an auxiliary seal.

[0018] Beneficial Effects

[0019] Compared with the prior art, the advantages of the ceramic pump body of the present invention are:

[0020] 1. A tapered hole is provided on the volute lining, a through hole is provided on the outer shell layer and / or the first buffer layer, a tapered shaft matching the tapered hole is provided on the guard plate lining, a shaft matching the through hole is provided on the guard plate, and an annular space for placing a seal is provided between the volute and the guard plate. A first wear-resistant layer is provided on the first axial end face of the annular space. In this way, a mold can be used to directly form the composite wear-resistant material on the pump body to manufacture the tapered hole and the first axial end face. Without mechanical grinding of the volute lining made of ceramic material, the dimensional accuracy of the first axial end face of the annular space can meet the requirements of matching sealing, 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, so as to extend the service life of the pump body. The same effect can be achieved by providing a composite wear-resistant material with an average thickness of 0.2-2mm on the tapered shaft of the rear guard plate or on the tapered shaft on the front guard plate.

[0021] 2. The use of tapered holes and tapered shafts makes it easy to form and demold ceramic parts, thereby ensuring that the ceramic parts have a higher yield and dimensional accuracy.

[0022] 3. The wear-resistant pump body consists of three layers: 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 fully or partially filled between the metal shell and the volute lining, and the ceramic volute can be fixed by the binder in the composite wear-resistant material. When the volute lining is partially worn through or cracks appear, the composite wear-resistant layer can continue to resist wear and extend the service life of the pump.

[0023] 4. If the composite wear-resistant material sealing layer on the tapered hole or tapered shaft is too thick, it is easy to be worn by coarse particles in the medium. If it is too thin, it has no strength, and the particles in the composite wear-resistant material are not easy to enter the gap between the mold and the lining during manufacturing. When the average thickness is between 0.2-2mm, the above two problems can be solved more evenly.

[0024] 5. The cone angle of the tapered hole and the tapered shaft is 3-15°, which is convenient for demoulding the mold during processing.

[0025] 6. The composite wear-resistant material composed of wear-resistant particles and resin has good resistance to erosion and wear of fine particles, but poor resistance to erosion and wear of coarse particles. In this technical solution, the sintered ceramic lining is set at the part that is severely eroded by coarse particles, and the composite wear-resistant material is set at the sealing part that is only eroded and worn by fine particles. As long as the thickness of the composite wear-resistant material at the sealing part that is eroded and worn is controlled within an appropriate range, the life of the pump body can be guaranteed not to be reduced, and the processing cost of the pump body can be significantly reduced.

[0026] 7. The material of the volute lining, rear guard plate lining or front guard plate lining is silicon nitride bonded with silicon carbide, oxide bonded with silicon carbide or reaction-sintered silicon carbide. These materials have good wear resistance and are easy to scale up the pump.

[0027] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a cross-sectional view of Example 1;

[0030] Figure 2 for Figure 1 A local enlarged view at point A;

[0031] Figure 3 for Figure 1 A partial enlarged view of the upper rear guard plate at point A;

[0032] Figure 4 for Figure 1 A partial enlarged view of the upper volute at point A;

[0033] Figure 5 for Figure 1 A local enlarged view at point B;

[0034] Figure 6 for Figure 1 A partial enlarged view of the upper volute at position B;

[0035] Figure 7 For Figure 1 A partial enlarged view of the upper front guard plate at position B;

[0036] Figure 8 is a cross-sectional view of Example 2;

[0037] Fig. 9 for Figure 8 A partial enlarged view at C;

[0038] Fig.10 for Figure 8 A partial enlarged view of the upper rear guard plate at position C;

[0039] Fig.11 is a cross-sectional view of Example 3;

[0040] Fig.12 for Fig.11 A local enlarged view at D;

[0041] Fig.13 for Fig.11 A partial enlarged view of the upper volute at D;

[0042] Fig.14 for Fig.11 A partial enlarged view of the upper rear guard plate at position D;

[0043] Fig.15 Schematic diagram of the volute processing process of Example 4;

[0044] Fig.16 This is a schematic diagram of the rear guard plate processing process of Example 5. DETAILED DESCRIPTION

[0045] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0046] Example 1

[0047] Specific embodiment of the present invention is shown in FIG. Figure 1-7 As shown, a ceramic pump body includes a volute and a guard plate, and the volute includes a shell 101 and a volute liner 102. The guard plate includes a guard plate frame and a guard plate liner, and a first buffer layer 103 is arranged between the shell 101 and the volute liner 102. A through hole and a tapered hole are arranged in sequence from the outside to the inside in the middle of the volute, and the through hole is connected to the tapered hole through a first axial end face. A second buffer layer is arranged between the guard plate frame and the guard plate liner, and a shaft body and a tapered shaft are arranged on the guard plate in sequence, and the shaft body is connected to the tapered shaft through a second axial end face. The shaft body cooperates with the through hole, and the tapered shaft cooperates with the tapered hole. An annular space for placing a seal is arranged between the volute and the guard plate, which is surrounded by the first axial end face, the second axial end face, the inner wall of the through hole and the outer wall of the tapered shaft. The inner wall of the annular space is arranged on the second buffer layer and / or the guard plate liner, and is not arranged on the guard plate frame.

[0048] 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.

[0049] The guard plate includes a front guard plate and a rear guard plate, which are respectively buckled on the front and rear sides of the volute. The front guard plate includes a front guard plate frame 301, a second front buffer layer 303 and a front guard plate liner 302 arranged in sequence. The rear guard plate includes a rear guard plate frame 201, a second rear buffer layer 203 and a rear guard plate liner 202 arranged in sequence. The housing 101 is made of metal, the volute liner 102 is made of ceramic material, and the rear guard plate liner 202 is made of ceramic material.

[0050] A first tapered hole 10 is provided at the rear side of the volute liner 102, and a first through hole 20 is provided on the housing 101. The first through hole 20 of the volute is connected to the first tapered hole 10 through a first axial rear end face 1041. A second rear buffer layer 203 is provided between the rear guard plate skeleton 201 and the rear guard plate liner 202, and a first tapered shaft 11 matching the first tapered hole 10 is provided on the rear guard plate liner 202, and the maximum diameter of the first tapered shaft 11 is φ1'. A first shaft body 21 matching the first through hole 20 is provided on the rear guard plate skeleton 201, and the outer diameter of the first shaft body 21 is φ2'. The first shaft body 21 on the rear guard is connected to the first tapered shaft 11 through a second axial rear end face 1042. The first axial rear end face 1041 and the second axial rear end face 1042 are both annular. A first annular space 104 for placing an annular seal is provided between the volute and the rear guard, and the seal is a sealing gasket or a sealing ring. The first annular space 104 has an outer diameter of φ2 and an inner diameter of φ1'. The first annular space 104 is surrounded by the first axial rear end face 1041, the second axial rear end face 1042, the first through hole 20 and the 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.

[0051] The first annular space 104 is provided with a first wear-resistant layer with an average thickness of not less than 0.5 mm on the first axial rear end face 1041 of the volute, the first wear-resistant layer is a composite wear-resistant material, the volute liner 102, the rear guard plate liner 202 and the front guard plate liner 302 are made of silicon nitride combined with silicon carbide, and the shell 101, the rear guard plate frame 201 and the front guard plate frame 301 are all made of metal. The first buffer layer 103, the second rear buffer layer 203 and the second front buffer layer 303 are made of a mixture of vinyl resin and silicon carbide particles.

[0052] In this embodiment, a second cone shaft 31 is provided on the front guard plate liner 302, and the maximum outer diameter of the second cone shaft 31 is φ3'. A second shaft body 41 is provided on the front guard plate skeleton 301, and the outer diameter of the second shaft body 41 is φ4'. The second shaft body 41 of the front guard plate is connected to the second cone shaft 31 through the second axial front end face 1052. A second cone hole 30 matching with the second cone shaft 31 is provided on the front side of the volute liner 102, and a second through hole 40 matching with the second shaft body 41 is also provided on the front side of the volute. The diameter of the second through hole 40 is φ4. The maximum diameter of the second cone hole 30 is φ3. The second through hole 40 of the volute is connected to the second cone hole 30 through the first axial front end face 1051. The first axial front end face 1051 and the second axial front end face 1052 are both annular. A second annular space 105 for placing a seal is provided between the volute and the front guard plate, and the outer diameter of the second annular space is φ4 and the inner diameter is φ3'. The second annular space 105 is surrounded by the first axial front end face 1051, the second axial front end face 1052, the inner wall of the second through hole 40 and the outer wall of the second tapered shaft 31. A first wear-resistant layer with an average thickness of not less than 0.5 mm is provided on the first axial front end face 1051 of the second annular space 105. 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.

[0053] In this embodiment, the surfaces of the first tapered hole 10 and the second tapered 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 made of composite wear-resistant materials.

[0054] 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 made of composite wear-resistant materials.

[0055] In this embodiment, a second wear-resistant layer is provided on 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 , and the second wear-resistant layer is a composite wear-resistant material.

[0056] The first axial front end face 1051 and the first axial rear end face 1041 are both arranged on the first buffer layer 103. The second axial front end face 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 face 1042 and the inner circumferential side wall of the first annular space 104 are arranged on the second rear buffer layer 203.

[0057] In this embodiment, the part of the first buffer layer 103 that is not in contact with the 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.

[0058] The cone angles of the cone hole of the volute and the cone axis of the guard plate are 3-15 degrees. The components of the composite wear-resistant material include resin binder and wear-resistant particles, and the wear-resistant particles include one or any combination of silicon carbide, corundum, garnet, silicon nitride, quartz, and zirconium oxide.

[0059] Example 2

[0060] like Figure 8 , 9 As shown in Figure 10, this embodiment is substantially the same as the embodiment 1, except that no front guard plate is provided, and the second axial rear end face 1042 of the first annular space 104 is made of silicon carbide ceramic material, and the material of the first tapered shaft 11 is also silicon carbide ceramic. Obviously, the rear guard plate of this structure generally needs to be machined to meet the sealing requirements, but since the size of the rear guard plate is small and the outer circle of the machining shaft is used, the cost of this mechanical cutting is relatively low, so it can still meet the requirements of some production processes.

[0061] Example 3

[0062] like Figures 11 to 14 As shown, this embodiment is substantially the same as Embodiment 2, 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 to the through hole through a first auxiliary axial end face. An auxiliary shaft body is provided on the guard plate, and the auxiliary shaft body, the shaft body and the tapered shaft are arranged in sequence, and the auxiliary shaft body is connected to the shaft body through a second auxiliary axial end face. The inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end face and the second auxiliary axial end face form an auxiliary annular space for placing an auxiliary seal.

[0063] In this embodiment, the auxiliary through hole is a 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 50 is connected to the first through hole 20 through an annular first auxiliary axial rear end face 1091. A first auxiliary shaft body 51 is provided on the rear guard plate, and 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 is connected to the first shaft body 21 through an annular second auxiliary axial rear end face 1092. Among them, the first auxiliary through hole 50 is arranged on the housing 101, the first auxiliary axial rear end face 1091 is arranged on the first buffer layer 103, and the first auxiliary shaft body 51 and the second auxiliary axial rear end face 1092 are both arranged on the rear guard plate frame 201. 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 matched. 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 face 1091 and the second auxiliary axial rear end face 1092 together form a first auxiliary annular space 109 for placing an annular seal. By arranging an auxiliary sealing element in the first auxiliary annular space 109, the sealing of the pump body can be maintained when the sealing element in the annular space 104 fails, thereby improving the reliability of the pump body and extending its service life.

[0064] In this embodiment, the aperture of the first auxiliary through hole 50 is φ5, the outer diameter of the first auxiliary shaft body 51 is φ5'. The outer diameter of the auxiliary annular space 109 is φ5, and the inner diameter is φ2'.

[0065] Obviously, the reliability of the seal between the guard plate and the volute can be further improved by increasing the number of auxiliary annular spaces.

[0066] In addition, the front guard plate may also be provided with an auxiliary shaft body and a second auxiliary axial end face, and the front side of the volute may also be provided with an auxiliary through hole and a first auxiliary axial end face.

[0067] Example 4

[0068] This embodiment is substantially the same as embodiment 2. Fig.15The processing schematic diagram of the first tapered hole 10 and the first through hole 20 on the volute is shown. The maximum diameter of the first tapered hole 10 is φ1, and the diameter of the first through hole 20 is φ2. First, a tooling die 108 is made, and a third tapered shaft and a third shaft body are set thereon. The size of the third tapered shaft is the same as that of the first tapered 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 the tooling die 108, and a composite wear-resistant material is added to the cavity 107 between the shell 101 and the volute liner 102. After the composite wear-resistant material is hardened, a first buffer layer 103 will be formed, and a first tapered hole 10 and a first through hole 20 will also be formed. At the same time, a first sealing layer 106 and a first axial rear end face 1041 will also be formed. 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.

[0069] Example 5

[0070] This embodiment is substantially the same as embodiment 1. Fig.16 The processing schematic diagram of the first cone shaft 11 and the first shaft body 21 on the rear guard plate is shown. First, the tooling mold 208 is manufactured. The sizes of the fourth cone hole and the fourth through hole set on the tooling mold 208 are the same as those of the first cone shaft 11 and the first shaft body 21. The rear guard plate frame 201 and the rear guard plate lining 202 are placed in the tooling mold 208, and the composite wear-resistant material is added between the rear guard plate frame 201 and the rear guard plate lining 202. After hardening, the first cone shaft 11 and the first shaft body 21 will be processed on the rear guard plate, and the second sealing layer 206 and the second axial rear end face 1042 will also be formed.

[0071] Obviously, in the above-mentioned embodiments, the first through hole 20 and / or the second through hole 40 of the volute is set as a tapered hole, and the first shaft body 21 of the rear guard plate and / or the second shaft body 41 of the rear guard plate is set as a tapered shaft, or the auxiliary through hole is replaced by a tapered hole, and the auxiliary shaft body is replaced by a tapered shaft, which can also achieve exactly the same effect, and therefore is also within the scope of the present invention.

[0072] 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

1. A ceramic pump body, comprising a volute and a guard plate, wherein the volute comprises a shell (101) and a volute liner (102); the guard plate comprises a guard plate frame and a guard plate liner, wherein: A first buffer layer (103) is provided between the shell (101) and the volute liner (102); a through hole and a tapered hole are provided in sequence from the outside to the inside in the middle of the volute, and the through hole is connected to the tapered hole through a first axial end face; a second buffer layer is provided between the guard plate frame and the guard plate liner, and a shaft body and a tapered shaft are provided in sequence on the guard plate, and the shaft body is connected to the tapered shaft through a second axial end face; the shaft body cooperates with the through hole, and the tapered shaft cooperates with the tapered hole; an annular space for placing a seal is provided between the volute and the guard plate, which is surrounded by the first axial end face, the second axial end face, the inner wall of the through hole and the outer wall of the tapered shaft, and the first axial end face is provided between the volute and the guard plate. The surface comprises a first axial rear end surface (1041) and a first axial front end surface (1051), the second axial end surface comprises a second axial rear end surface (1042) and a second axial front end surface (1052), the first axial rear end surface (1041) and the second axial rear end surface (1042) are both annular, a first wear-resistant layer with an average thickness of not less than 0.5 mm is provided on the first axial end surface of the annular space, the first wear-resistant layer is a composite wear-resistant material, and a sealing layer with an average thickness of between 0.2 and 2 mm is provided on the tapered hole surface of the volute, the sealing layer is a composite wear-resistant material.

2. A ceramic pump body according to claim 1, characterized in that: The first axial end surface is arranged on a first buffer layer (103), and the second axial end surface and the inner circumferential side wall of the annular space are arranged on a second buffer layer.

3. A ceramic pump body according to claim 1, characterized in that: The guard plate includes a front guard plate and / or a rear guard plate.

4. A ceramic pump body according to claim 1, characterized in that: A second wear-resistant layer is arranged on the second axial end surface of the annular space, and the second wear-resistant layer is a composite wear-resistant material.

5. A ceramic pump body according to claim 1, characterized in that: The conical shaft surface of the guard plate lining is provided with a sealing layer with an average thickness of 0.2-2 mm, and the sealing layer is a composite wear-resistant material.

6. A ceramic pump body according to claim 1, characterized in that: The housing (101) is made of metal, the volute lining (102) is made of ceramic, and the guard plate lining is made of ceramic; the first buffer layer (103) or the second buffer layer is partially or entirely made of a composite wear-resistant material.

7. A ceramic pump body according to claim 4, 5 or 6, characterized in that: The components of the composite wear-resistant material include a resin binder and wear-resistant particles, and the wear-resistant particles include one of silicon carbide, corundum, garnet, silicon nitride, quartz, zirconium oxide or any combination thereof.

8. A ceramic pump body according to claim 1, characterized in that: An auxiliary through hole is provided on the volute, and the auxiliary through hole, through hole and tapered hole are arranged in sequence; the auxiliary through hole is connected to the through hole through a first auxiliary axial end face; an auxiliary shaft body is provided on the guard plate, and the auxiliary shaft body, shaft body and tapered shaft are arranged in sequence, and the auxiliary shaft body is connected to the shaft body through a second auxiliary axial end face; the inner wall of the auxiliary through hole, the outer wall of the shaft body, the first auxiliary axial end face and the second auxiliary axial end face form an auxiliary annular space for placing an auxiliary seal.

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