Double-volute split-half wafer type pump body and centrifugal pump using same

Abstract

The invention discloses a double-volute split-half wafer type pump body and a centrifugal pump using the same. The double-volute split-half wafer type pump body comprises a first inner volute, a second inner volute and a third inner volute, the side wall of one side of the second inner volute is attached to the side wall of one side of the first inner volute, and a medium flowing channel is formed between the second inner volute and the first inner volute; the first outer shell covers the first inner volute; the second inner volute is covered with the second outer shell, and the second outer shell is connected with the first outer shell and clamps the first inner volute and the second inner volute; the first external flange is connected with the first outer shell and clamps the first inner volute, the second external flange is connected with the second outer shell and clamps the second inner volute, and the third external flange is connected to the top of the first outer shell and the top of the second outer shell; the detachable plugging piece is connected to the first outer shell; therefore, the technical problems that the operation stability is relatively poor, the service life is relatively short, the maintenance cost is relatively high, and the medium conveying efficiency is relatively low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and more specifically, to a double volute split clamp type pump body and a centrifugal pump using the pump body. Background Art

[0002] In the fields of chemical industry, metallurgy, pesticides, etc., centrifugal pumps are widely used. In order to transport highly corrosive media (such as hydrochloric acid, 50% sulfuric acid, etc.), generally, the parts of the centrifugal pump that come into contact with the medium are made of fluoroplastic materials; The structure of the existing centrifugal pump generally includes: a bearing housing, a pump shaft, a mechanical seal, a pump cover, an impeller, and a pump body. The pump shaft is connected to the bearing housing, the mechanical seal is connected between the impeller, the pump cover, the pump shaft, and the bearing housing, the pump cover is connected between the bearing housing and the pump body, the impeller is connected to the pump shaft, the pump body is connected to the bearing housing, and the impeller is accommodated inside the pump body; Among them, the pump body of the existing centrifugal pump is of an integral structure, and at least has the following deficiencies: 1. For the integral structure, it is inconvenient to machine the flow channels on the pump body, resulting in relatively low smoothness of the flow channels. The greater the frictional resistance between the flow channels and the medium, the lower the efficiency of transporting the medium; 2. When operating under non-rated conditions, unbalanced radial forces are likely to occur at the flow channels, resulting in vibrations, which reduces the service life of components such as the pump shaft, bearings, and mechanical seals; 3. For the integral structure, when damaged or under maintenance, it usually needs to be replaced as a whole, with relatively high maintenance costs and relatively low work efficiency. Summary of the Invention

[0003] Aiming at the above deficiencies in the related technologies, the purpose is to provide a double volute split clamp type pump body and a centrifugal pump using the pump body to solve the technical problems of relatively poor operating stability, relatively short service life, relatively high maintenance costs, and relatively low efficiency of transporting the medium in the related technologies; The technical solution to achieve the purpose is: A double volute split clamp type pump body, comprising: A first inner volute, the material of the first inner volute being fluoroplastic; A second inner volute, the material of the second inner volute being fluoroplastic. One side wall of the second inner volute is attached to one side wall of the first inner volute, and a medium flow channel is formed between the second inner volute and the first inner volute; A first outer housing, covering the first inner volute and covering the other side wall of the first inner volute; A second outer housing, covering the second inner volute and covering the other side wall of the second inner volute. The second outer housing is connected to the first outer housing and clamps the first inner volute and the second inner volute; Three external flanges, the first external flange is connected to the first outer housing and clamps the first inner volute, the second external flange is connected to the second outer housing and clamps the second inner volute, and the third external flange is connected to the tops of the first outer housing and the second outer housing and presses the tops of the first inner volute and the second inner volute; And a detachable plugging member, which is connected to the first outer housing and is used to plug a first through hole on the first inner volute, and the first through hole communicates with the medium flow channel.

[0004] Furthermore: The first inner volute includes: a first volute main body, and a first concave space is formed on the first volute main body; A first arc-shaped partition block, which is connected to the first volute main body and is arranged in the first concave space, and divides a part of the first concave space into a first flow channel and a second flow channel; A first convex edge, which is arranged along the outer edge of the first volute main body; A groove, which is arranged on one side wall of the first volute main body and the first convex edge; A first outer convex port, which is arranged on the other side wall of the first volute main body and penetrates through the first outer housing, the first outer convex port communicates with the first concave space, and a first annular groove is formed on the first outer convex port, and the external flange is clamped at the first annular groove; A first split flange, which is arranged on the top of the first volute main body and is engaged with the top of the first outer housing; And a second outer convex port, which is arranged on the other side wall of the first volute main body and is spaced from the first outer convex port, a first through hole is formed on the second outer convex port, a second annular groove is formed on the second outer convex port, and the detachable plugging member is arranged at the second outer convex port.

[0005] Furthermore: The second inner volute includes: a second volute main body, and a second concave space is formed on the second volute main body, and the second concave space and the first concave space together form the medium flow channel; A second arc-shaped partition block, which is connected to the second volute main body and is arranged in the second concave space, and divides a part of the second concave space into a third flow channel and a fourth flow channel, the third flow channel is aligned and communicated with the first flow channel, and the fourth flow channel is aligned and communicated with the second flow channel; A second convex edge, which is arranged along the outer edge of the second volute main body; A boss, which is arranged on one side wall of the second volute main body and the second convex edge and is used to be engaged with the groove; The third outward convex opening is arranged on the other side wall of the second volute main body, penetrates through the second outer housing, the third outward convex opening communicates with the second inner concave space, and a third annular groove is formed on the third outward convex opening, and the external flange is clamped at the third annular groove; And a second split flange is arranged on the top of the second volute main body, is clamped with the top of the second outer housing, and the second split flange and the first split flange are combined into a complete flange.

[0006] Furthermore: when the first outer housing and the second outer housing clamp the first inner volute and the second inner volute together, there is a gap between the first outer housing and the second outer housing; The first outer housing and the second outer housing are connected by a plurality of bolts.

[0007] Furthermore: the first outer housing or the second outer housing includes: a housing main body that houses the first volute main body, the first convex edge and the first split flange, or houses the second volute main body, the second convex edge and the second split flange, and a second through hole is formed on the housing main body, and the second through hole is penetrated by the first outward convex opening or the third outward convex opening; A plurality of reinforcing ribs are evenly distributed on one side wall of the housing main body; Two split lifting blocks are connected to the housing main body at intervals, and a third through hole is formed on the split lifting block; And two split support frames are connected to the housing main body at intervals and are arranged at intervals with the split lifting blocks.

[0008] Furthermore: a fourth through hole is further formed on the housing main body of the first outer housing, and the fourth through hole is penetrated by the second outward convex opening.

[0009] Furthermore: the structures of the first external flange and the second external flange are the same, and both include: two third split flanges, and the partial cross section of the third split flange is an "L" - shaped structure and is clamped at the first annular groove or the third annular groove.

[0010] Furthermore: the third external flange includes: an internal pressure ring, which is arranged on the tops of the first split flange and the second split flange, and the middle position communicates with the medium flow channel, and the material of the internal pressure ring is fluoroplastics; A first sealing member is arranged between the internal pressure ring, the first split flange and the second split flange; And a first pressing flange is connected to the tops of the first outer housing and the second outer housing to press the internal pressure ring.

[0011] Further: The detachable plugging member includes: two fourth half-flanges, which are clamped at the second annular groove and connected to the first outer housing; A plug, which is inserted at the first through hole, and the material of the plug is fluoroplastics; A second seal, which is arranged between the plug and the second outer convex port; And a second pressing flange, which is connected to the fourth half-flange and presses the plug.

[0012] A centrifugal pump adopts the double-volute split clamp-type pump body described above. In the medium flow channel formed at the first inner volute and the second inner volute, an impeller is accommodated; A bearing housing is connected to the external flange on the second outer housing, and a pump cover is pressed between the bearing housing and the second inner volute; A liquid inlet pipeline is connected to the external flange on the first outer housing; A liquid outlet pipeline is connected to the external flanges on the tops of the first outer housing and the second outer housing.

[0013] Adopting the above technical solution, the following beneficial effects are achieved: A double-volute split clamp-type pump body and a centrifugal pump using the pump body, compared with the related technology, are provided with a first inner volute, a second inner volute, a first outer housing, a second outer housing, an external flange and a detachable plugging member; The material of the first inner volute is fluoroplastics, the material of the second inner volute is fluoroplastics, one side side wall of the second inner volute is attached to one side side wall of the first inner volute, a medium flow channel is formed between the second inner volute and the first inner volute, the second outer housing is connected to the first outer housing, clamping the first inner volute and the second inner volute, the external flange is connected to the second outer housing and the first outer housing, and the detachable plugging member is connected to the first outer housing. Since each component is separately arranged, the assembly is relatively convenient, and it is beneficial to perform fine machining on the medium flow channel formed between the second inner volute and the first inner volute, improving the smoothness of the medium flow channel, the efficiency of transporting the medium is relatively high, the probability of generating unbalanced radial force is reduced, the vibration is reduced, the operation stability is relatively good, the maintenance cost is relatively low, and the service life is extended; Thereby overcoming the technical problems of relatively poor operation stability, relatively short service life, relatively high maintenance cost, and relatively low efficiency of transporting the medium, and achieving the technical effects of relatively good operation stability, extended service life, relatively low maintenance cost, and relatively high efficiency of transporting the medium. Description of the Drawings

[0014] Figure 1 It is a partial cross-sectional view of the double-volute split clamp-type pump body; Figure 2It is a three-dimensional structure schematic diagram of a double volute split clamp type pump body; Figure 3 It is a partial sectional view of the third external flange connected to the tops of the first housing body and the second housing body; Figure 4 It is an exploded view of the first inner volute, the second inner volute, the first housing body and the second housing body; Figure 5 It is one of the structure schematic diagrams of the first inner volute; Figure 6 It is another structure schematic diagram of the first inner volute; Figure 7 It is one of the structure schematic diagrams of the second inner volute; Figure 8 It is another structure schematic diagram of the second inner volute; Figure 9 It is one of the structure schematic diagrams of the first housing body; Figure 10 It is another structure schematic diagram of the first housing body; Figure 11 It is the structure schematic diagram of the second housing body; Figure 12 It is a partial sectional view after the double volute split clamp type pump body is assembled with the impeller, the bearing housing and the pump cover; Figure 13 It is for Figure 12 the partial enlarged schematic diagram of part A in In the figure: 10. First inner volute, 11. First through hole, 10-1. First volute main body, 10-11. First concave space, 10-2. First arc-shaped partition block, 10-11-1. First flow channel, 10-11-2. Second flow channel, 10-3. First convex edge, 10-4. Groove, 10-5. First external convex opening, 10-51. First annular groove, 10-6. First split flange, 10-7. Second external convex opening, 10-71. Second annular groove, 20. Second inner volute, 20-1. Second volute main body, 20-11. Second concave space, 20-11-1. Third flow channel, 20-11-2. Fourth flow channel, 20-2. Second arc-shaped partition block, 20-3. Second convex edge, 20-4. Boss, 20-5. Third external convex opening, 20-51. Third annular groove, 20-6. Second split flange, 1020. Medium flow-through channel, 30. First outer housing, 30-1. Housing main body, 30-11. Second through hole, 30-12. Fourth through hole, 30-2. Reinforcing rib, 30-3. Split lifting block, 30-31. Third through hole, 30-4. Split support frame, 40. Second outer housing, 50. External flange, 50-1. Inner pressure ring, 50-2. First seal, 50-3. First compression flange, 60. Removable plugging member, 60-1. Fourth split flange, 60-2. Plugging, 60-3. Second seal, 60-4. Second compression flange, 100. Impeller, 200. Bearing housing, 300. Pump cover. Detailed implementation mode

[0015] In order to make the content easier to be clearly understood, the following further detailed description is made according to specific embodiments in combination with the accompanying drawings; A double-volute split clamp-type pump body and a centrifugal pump using the pump body solve the technical problems of relatively poor operation stability, relatively short service life, relatively high maintenance cost, and relatively low efficiency of transporting the medium in the related art, and achieve the positive effects of relatively good operation stability, extended service life, relatively low maintenance cost, and relatively high efficiency of transporting the medium. The general idea is as follows: Embodiment 1

[0016] As Figure 1 , Figure 2 , Figure 4 , Figure 12 shown; A double-volute split clamp-type pump body and a centrifugal pump using the pump body, the double-volute split clamp-type pump body includes: a first inner volute 10, and the material of the first inner volute 10 is fluoroplastic; The second inner volute 20, the material of the second inner volute 20 is fluoroplastics, one side wall of the second inner volute 20 is attached to one side wall of the first inner volute 10, and a medium flow channel 1020 is formed between the second inner volute 20 and the first inner volute 10; The first outer housing 30, covering the first inner volute 10, covering the other side wall of the first inner volute 10; The second outer housing 40, covering the second inner volute 20, covering the other side wall of the second inner volute 20, the second outer housing 40 is connected to the first outer housing 30, clamping the first inner volute 10 and the second inner volute 20; Three external flanges 50, the first external flange 50 is connected to the first outer housing 30, clamping the first inner volute 10, the second external flange 50 is connected to the second outer housing 40, clamping the second inner volute 20, the third external flange 50 is connected to the tops of the first outer housing 30 and the second outer housing 40, pressing the tops of the first inner volute 10 and the second inner volute 20; And a detachable plugging member 60, connected to the first outer housing 30, for plugging the first through hole 11 on the first inner volute 10, the first through hole 11 communicates with the medium flow channel 1020; The centrifugal pump adopts the double volute split-half clamping pump body described above, and the impeller 100 is accommodated in the medium flow channel 1020 formed at the first inner volute 10 and the second inner volute 20; A bearing housing 200 is connected to the external flange 50 on the second outer housing 40, and a pump cover 300 is pressed between the bearing housing 200 and the second inner volute 20; A liquid inlet pipeline is connected to the external flange 50 on the first outer housing 30; A liquid outlet pipeline is connected to the external flange 50 on the tops of the first outer housing 30 and the second outer housing 40; Specifically, during implementation, the material of the first inner volute 10 is fluoroplastics, the material of the second inner volute 20 is fluoroplastics, one side wall of the second inner volute 20 is attached to one side wall of the first inner volute 10, a medium flow channel 1020 is formed between the second inner volute 20 and the first inner volute 10, the medium flow channel 1020 is conducive to the smooth flow of the medium, and the fluoroplastics material has relatively good anti-corrosion performance; The second outer housing 40 is connected to the first outer housing 30, clamping the first inner volute 10 and the second inner volute 20, so that the medium will not leak. Moreover, they are separately arranged, which is relatively convenient for assembly, and is also beneficial to the precision machining of the second inner volute 20 and the first inner volute 10. The smoothness of the formed medium flow channel is relatively high, the efficiency of conveying the medium is relatively high, the probability of generating unbalanced radial force is reduced, the vibration is reduced, the operation stability is relatively good, the maintenance cost is relatively low, and the service life is extended; The external flange 50 is connected to the second outer housing 40 and the first outer housing 30, which not only improves the reliability of the structure, but also is beneficial to the assembly with other components (such as the bearing housing 200, the liquid outlet pipe and the liquid inlet pipe), and the assembly is relatively convenient; The detachable plugging member 60 is connected to the first outer housing 30. When cleaning is required, by opening the detachable plugging member 60, the medium flow channel 1020 can be flushed, and it is relatively convenient to use; Embodiment 2

[0017] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 12As shown; during implementation, the first inner volute 10 includes: a first volute main body 10-1, on which there is a first concave space 10-11; a first arc-shaped partition block 10-2, connected to the first volute main body 10-1 and arranged in the first concave space 10-11, dividing a part of the first concave space 10-11 into a first flow channel 10-11-1 and a second flow channel 10-11-2; a first convex edge 10-3, arranged along the outer edge of the first volute main body 10-1; a groove 10-4, arranged on one side wall of the first volute main body 10-1 and the first convex edge 10-3; a first outer convex opening 10-5, arranged on the other side wall of the first volute main body 10-1, passing through the first outer housing 30, the first outer convex opening 10-5 communicating with the first concave space 10-11, and there being a first annular groove 10-51 on the first outer convex opening 10-5, where the external flange 50 is clamped at the first annular groove 10-51; a first split flange 10-6, arranged on the top of the first volute main body 10-1 and engaging with the top of the first outer housing 30; and a second outer convex opening 10-7, arranged on the other side wall of the first volute main body 10-1, spaced from the first outer convex opening 10-5, there being a first through hole 11 on the second outer convex opening 10-7, there being a second annular groove 10-71 on the second outer convex opening 10-7, and a detachable plugging member 60 being arranged at the second outer convex opening 10-7; The material of the first inner volute 10 is fluoroplastics, improving the anti-corrosion performance; The first volute main body 10-1, the first arc-shaped partition block 10-2, the first convex edge 10-3, the groove 10-4, the first outer convex opening 10-5, the first split flange 10-6 and the second outer convex opening 10-7 are integrally injection-molded; The outer shape of the first volute main body 10-1 is generally a "b" - shaped structure, and the formed first concave space 10-11 is generally a "b" - shaped structure; The outer shape of the first arc-shaped partition block 10-2 is generally an "S" - shaped structure, dividing a part of the first concave space 10-11 into a first flow channel 10-11-1 and a second flow channel 10-11-2; The first convex edge 10-3 is provided, increasing the contact area with the first outer housing 30; The groove 10-4 is provided, used for cooperating with the boss 20-4, which is beneficial to the first inner volute 10 fitting with the second inner volute 20; The first outer convex opening 10-5 is a circular ring structure, having a first annular groove 10-51, which is beneficial to clamping the external flange 50; The first split flange 10-6 is provided, increasing the contact area with the first outer housing 30; A second outward convex opening 10-7 is provided, which is beneficial to connecting the detachable plugging member 60; Wherein, the second inner volute 20 includes: a second volute main body 20-1, on which there is a second inner concave space 20-11, and the second inner concave space 20-11 and the first inner concave space 10-11 together form the medium flow channel 1020; a second arc-shaped partition block 20-2, connected to the second volute main body 20-1 and arranged in the second inner concave space 20-11, which divides a part of the second inner concave space 20-11 into a third flow channel 20-11-1 and a fourth flow channel 20-11-2, the third flow channel 20-11-1 is aligned and communicated with the first flow channel 10-11-1, and the fourth flow channel 20-11-2 is aligned and communicated with the second flow channel 10-11-2; a second convex edge 20-3, arranged along the outer edge of the second volute main body 20-1; a boss 20-4, arranged on one side wall of the second volute main body 20-1 and the second convex edge 20-3 for engaging with the groove 10-4; a third outward convex opening 20-5, arranged on the other side wall of the second volute main body 20-1 and passing through the second outer housing 40, the third outward convex opening 20-5 is communicated with the second inner concave space 20-11, and there is a third annular groove 20-51 at the third outward convex opening 20-5, and the external flange 50 is clamped at the third annular groove 20-51; and a second half flange 20-6, arranged on the top of the second volute main body 20-1 and engaged with the top of the second outer housing 40, and the second half flange 20-6 and the first half flange 10-6 are combined into a complete flange; The material of the second inner volute 20 is fluoroplastic, which improves the anti-corrosion performance; The second volute main body 20-1, the second arc-shaped partition block 20-2, the second convex edge 20-3, the boss 20-4, the third outward convex opening 20-5 and the second half flange 20-6 are integrally injection molded; The outer shape of the second volute main body 20-1 is generally in a "b" shape structure, and the formed second inner concave space 20-11 is generally in a "b" shape structure; The outer shape of the second arc-shaped partition block 20-2 is generally in an "S" shape structure, which divides a part of the second inner concave space 20-11 into a third flow channel 20-11-1 and a fourth flow channel 20-11-2; The third flow channel 20-11-1 is aligned and connected to the first flow channel 10-11-1, and the fourth flow channel 20-11-2 is aligned and connected to the second flow channel 10-11-2, such that a part of the medium circulation channel 1020 is divided into two medium flow channels. When the medium enters the medium circulation channel 1020 at the first outer convex opening 10-5, following the medium circulation channel 1020, it flows out through the two medium flow channels respectively (one medium flow channel is the third flow channel 20-11-1 and the first flow channel 10-11-1, and the other medium flow channel is the fourth flow channel 20-11-2 and the second flow channel 10-11-2). The medium flow channels have a guiding effect, making the medium circulation relatively stable, reducing the probability of generating unbalanced radial forces, and reducing vibrations; A second convex edge 20-3 is provided, increasing the contact area with the second outer housing 40; When the second outer housing 40 is connected to the first outer housing 30 to clamp the first inner volute 10 and the second inner volute 20, the first convex edge 10-3 and the second convex edge 20-3 are beneficial to improving the clamping effect; A boss 20-4 is provided for mating with the groove 10-4, which is beneficial to the fitting of the first inner volute 10 and the second inner volute 20, reducing the probability of leakage; The third outer convex opening 20-5 is of an annular structure and has a third annular groove 20-51, which is beneficial to clamping the external flange 50; A second split flange 20-6 is provided, increasing the contact area with the second outer housing 40. The second split flange 20-6 and the first split flange 10-6 are combined into a complete flange, which is beneficial to the second outer housing 40 and the first outer housing 30 clamping the first inner volute 10 and the second inner volute 20 together; The first inner volute 10 and the second inner volute 20 are provided as split structures (disassembled structures), which is beneficial to the precision machining of the first inner concave space 10-11, the first arc-shaped partition block 10-2, the groove 10-4, the second inner concave space 20-11, the second arc-shaped partition block 20-2, and the boss 20-4 by a numerical control machining center, making the finish of the medium circulation channel 1020 higher. For example, the finish is about 1.6 or 2.5. Compared with the integral structure, it is difficult for the integral structure volute to perform precision machining on the medium circulation channel 1020, and the finish of the flow channel is usually the finish during injection molding, generally about 6.3 or 12.5. The higher the finish, the smaller the friction resistance between the medium circulation channel 102 and the medium, improving the efficiency of conveying the medium (generally, the efficiency is increased by about 15%), and the medium flows more smoothly during circulation, reducing the probability of generating unbalanced radial forces and reducing vibrations; Embodiment III

[0018] Such as Figure 1 、 Figure 2 、 Figure 4 、Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown in Figure 12 . During implementation, when the first outer housing 30 and the second outer housing 40 clamp the first inner volute 10 and the second inner volute 20 together, there is a gap between the first outer housing 30 and the second outer housing 40; the first outer housing 30 and the second outer housing 40 are connected by a plurality of bolts; A gap is provided, for example: the gap is five millimeters, which is beneficial to tightening the first outer housing 30 and the second outer housing 40 through bolts (such as hexagon bolts), so that the first inner volute 10 and the second inner volute 20 are closely attached, and there is no leakage at the medium flow passage 1020; The split structure (split body structure) of the first outer housing 30 and the second outer housing 40 is relatively convenient to assemble, and when a part is damaged, only the damaged part needs to be replaced, and the maintenance cost is relatively low; Wherein, the first outer housing 30 or the second outer housing 40 includes: a housing main body 30-1, which houses the first volute main body 10-1, the first convex edge 10-3 and the first split flange 10-6, or houses the second volute main body 20-1, the second convex edge 20-3 and the second split flange 20-6. The housing main body 30-1 has a second through hole 30-11, and the second through hole 30-11 is penetrated by the first outer convex mouth 10-5 or the third outer convex mouth 20-5; a plurality of reinforcing ribs 30-2 are evenly distributed on one side wall of the housing main body 30-1; two split lifting blocks 30-3 are spaced and connected to the housing main body 30-1, and the split lifting blocks 30-3 have a third through hole 30-31; and two split support frames 30-4 are spaced and connected to the housing main body 30-1, and are spaced from the split lifting blocks 30-3; The housing main body 30-1 is provided, which can reliably position the first inner volute 10 and the second inner volute 20, and the connection reliability is relatively good; The reinforcing ribs 30-2 are provided, which improves the structural strength; The split lifting blocks 30-3 are provided, which is beneficial to hanging a lifting hook at the third through hole 30-31, and the lifting is relatively convenient; The split support frames 30-4 are provided, which is beneficial to connecting with the pump bottom plate (the pump bottom plate is a common structure in the prior art) through bolt parts, and the assembly is relatively convenient. Those of ordinary skill in the art can directly and unambiguously know how to set it after seeing the disclosed content, without the need to pay creative labor or conduct excessive experiments; Among them, the housing main body 30-1 on the first housing 30 further has a fourth through hole 30-12, and the fourth through hole 30-12 is penetrated by the second external convex mouth 10-7, which is relatively convenient for assembly; Embodiment 4

[0019] Such as Figure 1 , Figure 2 , Figure 3 , Figure 12 shown; in implementation, the structures of the first external flange 50 and the second external flange 50 are the same, and both include: two third half flanges, the partial cross-section of the third half flange is an "L" - shaped structure, and it is stuck at the first annular groove 10-51 or the third annular groove 20-51; The first external flange 50 is used to connect the liquid inlet pipeline through bolt parts, and the assembly is relatively convenient; The second external flange 50 is used to connect the bearing seat 200 through bolt parts, and the assembly is relatively convenient; Among them, the third external flange 50 includes: an inner pressure ring 50-1, which is arranged on the tops of the first half flange 10-6 and the second half flange 20-6, and the middle position is communicated with the medium flow channel 1020, and the material of the inner pressure ring 50-1 is fluoroplastics; a first seal 50-2, which is arranged between the inner pressure ring 50-1, the first half flange 10-6 and the second half flange 20-6; and a first pressing flange 50-3, which is connected to the tops of the first housing 30 and the second housing 40 and presses the inner pressure ring 50-1; The material of the inner pressure ring 50-1 is fluoroplastics, and the anti-corrosion performance is relatively good; The first seal 50-2 is an O-ring; The first pressing flange 50-3 is connected to the first housing 30 and the second housing 40 through bolt parts to press the inner pressure ring 50-1, and is used to connect the liquid outlet pipe through bolt parts, and the assembly is relatively convenient; There are three external flanges 50, and the external flanges 50 are respectively connected to different parts on the second housing 40 and the first housing 30, which not only improves the structural reliability, but also is conducive to assembling with other components (other components such as: bearing seat 200, liquid outlet pipe and liquid inlet pipeline), and the assembly is relatively convenient; Embodiment 5

[0020] Such as Figure 1 , Figure 12 , Figure 13As shown; during implementation, the detachable plugging member 60 includes: two fourth semi-flanges 60-1, which are clamped at the second annular groove 10-71 and connected to the first outer housing 30; a plug 60-2, which is inserted into the first through hole 11, and the material of the plug 60-2 is fluoroplastics; a second sealing member 60-3, which is arranged between the plug 60-2 and the second outer protrusion 10-7; and a second pressing flange 60-4, which is connected to the fourth semi-flange 60-1 and presses the plug 60-2; The fourth semi-flange 60-1 is clamped at the second annular groove 10-71 and is connected to the first outer housing 30 through a bolt member, and the assembly is relatively convenient; The plug 60-2 has a "T"-shaped structure and is used to block the first through hole 11; The second sealing member 60-3 is an O-ring; The second pressing flange 60-4 is connected to the fourth semi-flange 60-1 through a bolt member and is used to press the plug 60-2; The detachable plugging member 60 is connected to the first outer housing 30, and no medium will leak from the first through hole 11. Moreover, when cleaning is required, the detachable plugging member 60 is opened, and the medium flow channel 1020 can be flushed. The blockage in the medium flow channel 1020 flows out from the first through hole 11, and there is no need to disassemble the bearing housing 200, and it is relatively convenient to use; Regarding the structure of the centrifugal pump: See Figure 12 ; The centrifugal pump includes: a double-volute split clamp-type pump body, an impeller 100, a bearing housing 200, a pump cover 300, a pump shaft, and a mechanical seal; The pump shaft is connected to the bearing housing 200, and the mechanical seal is connected between the impeller 100, the pump cover 300, the pump shaft, and the bearing housing 200. The pump cover 300 is connected between the bearing housing 200 and the pump body. The impeller 100 is connected to the pump shaft, the pump body is connected to the bearing housing 200, the pump body houses the impeller 100, the motor drives the pump shaft to rotate, the impeller 100 rotates with the pump shaft, and the medium flows along the liquid inlet pipeline and enters the medium flow channel 1020 from the first outer protrusion 10-5. Along the medium flow channel 1020, the medium flows out through two medium flow channels (one medium flow channel is the third flow channel 20-11-1 and the first flow channel 10-11-1, and the other medium flow channel is the fourth flow channel 20-11-2 and the second flow channel 10-11-2) and enters the liquid outlet pipeline; Regarding the assembly method of the double-volute split clamp-type pump body: Step 1. Engage the groove 10-4 on the first inner volute 10 with the boss 20-4 on the second inner volute 20 so that one side wall of the first inner volute 10 is in contact with one side wall of the second inner volute 20; Step 2. Assemble the first outer housing 30 and the first inner volute 10; Step 3. Assemble the second outer housing 40 and the second inner volute 20. After alignment, lock the first outer housing 30 and the second outer housing 40 with bolts; Step 4. Assemble the external flange 50; Step 5. Assemble the detachable plugging member 60; Step 6. Check the assembly position to ensure that the assembly is in place.

[0021] Ordinary technicians in the art, after seeing the disclosed content, can directly and unambiguously know how to set up a centrifugal pump, without the need to perform creative labor or excessive experiments; In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or position relationship are based on the position relationship described in the drawings, and are only for the convenience of description or simplification of the description, rather than indicating a specific orientation that must be had; the operation process described in the embodiment is not an absolute use step, and corresponding adjustments can be made during actual use; Unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meaning understood by those with ordinary skills in the art; the "first", "second" and similar terms used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not determine the quantity limit, but indicate that there is at least one, and it needs to be determined according to the content of the embodiment; The above is only a preferred specific implementation manner, but the protection scope is not limited thereto. Any equivalent replacement or change made according to the technical solution and its inventive concept within the technical scope disclosed by those skilled in the art should be covered by the protection scope.

Claims

1. A double volute split clamp type pump body, characterized in that, Comprising: A first inner volute, the material of the first inner volute being fluoroplastics; A second inner volute, the material of the second inner volute being fluoroplastics, one side wall of the second inner volute being attached to one side wall of the first inner volute, and a medium flow passage being formed between the second inner volute and the first inner volute; A first outer housing, covering the first inner volute and covering the other side wall of the first inner volute; A second outer housing, covering the second inner volute and covering the other side wall of the second inner volute, the second outer housing being connected to the first outer housing and clamping the first inner volute and the second inner volute; Three external flanges, the first external flange being connected to the first outer housing and clamping the first inner volute, the second external flange being connected to the second outer housing and clamping the second inner volute, and the third external flange being connected to the tops of the first outer housing and the second outer housing and pressing the tops of the first inner volute and the second inner volute; And a detachable plugging member, connected to the first outer housing and used for plugging a first through hole on the first inner volute, the first through hole being communicated with the medium flow passage.

2. The double volute split clamp type pump body according to claim 1, wherein: The first inner volute includes: a first volute main body, the first volute main body having a first concave space; A first arc-shaped partition block, connected to the first volute main body and disposed in the first concave space, partitioning a part of the first concave space into a first flow channel and a second flow channel; A first convex edge, arranged along the outer edge of the first volute main body; A groove, disposed on one side wall of the first volute main body and the first convex edge; A first outer convex port, disposed on the other side wall of the first volute main body, passing through the first outer housing, the first outer convex port being communicated with the first concave space, and the first outer convex port having a first annular groove, and the first annular groove clamping the external flange; A first split flange, disposed on the top of the first volute main body and engaging with the top of the first outer housing; And a second outer convex port, disposed on the other side wall of the first volute main body and spaced from the first outer convex port, the second outer convex port having the first through hole, the second outer convex port having a second annular groove, and the detachable plugging member being disposed at the second outer convex port.

3. The double volute split clamp type pump body according to claim 2, wherein: The second inner volute includes: a second volute main body, the second volute main body having a second concave space, the second concave space and the first concave space together forming the medium flow passage; A second arc-shaped partition block, connected to the second volute main body and disposed in the second concave space, partitioning a part of the second concave space into a third flow channel and a fourth flow channel, the third flow channel being aligned and communicated with the first flow channel, and the fourth flow channel being aligned and communicated with the second flow channel; A second convex edge, arranged along the outer edge of the second volute main body; A convex platform, disposed on one side wall of the second volute main body and the second convex edge and used for engaging with the groove; The third outward convex opening is arranged on the other side wall of the second volute main body, penetrates through the second outer housing, the third outward convex opening communicates with the second inner concave space, and a third annular groove is formed on the third outward convex opening, and the external flange is clamped at the third annular groove; And a second split flange is arranged on the top of the second volute main body, is clamped with the top of the second outer housing, and the second split flange and the first split flange are combined into a complete flange.

4. A split double volute clamp-on pump body according to claim 3, characterized in that: When the first outer housing and the second outer housing clamp the first inner volute and the second inner volute together, there is a gap between the first outer housing and the second outer housing; The first outer housing and the second outer housing are connected by a plurality of bolts.

5. A split double volute clamp-type pump body according to claim 4, characterized in that: The first outer housing or the second outer housing includes: a housing main body that accommodates the first volute main body, the first convex edge and the first split flange, or accommodates the second volute main body, the second convex edge and the second split flange. A second through hole is formed on the housing main body, and the second through hole is penetrated by the first outward convex opening or the third outward convex opening; A plurality of reinforcing ribs are evenly distributed on one side wall of the housing main body; Two split lifting blocks are connected to the housing main body at intervals, and a third through hole is formed on the split lifting block; And two split support frames are connected to the housing main body at intervals and are arranged at intervals from the split lifting blocks.

6. The split double volute sandwich-type pump body according to claim 5, characterized in that: A fourth through hole is further formed on the housing main body of the first outer housing, and the second outward convex opening penetrates through the fourth through hole.

7. The double volute split clamp type pump body according to claim 3, characterized in that: The structures of the first external flange and the second external flange are the same, and both include: two third split flanges, and a partial cross section of the third split flange is an "L" shaped structure, which is clamped at the first annular groove or the third annular groove.

8. A split double-volute clamp-on pump body according to claim 7, characterized in that: The third external flange includes: an inner pressure ring, which is arranged on the tops of the first split flange and the second split flange, and the middle position communicates with the medium flow channel. The material of the inner pressure ring is fluoroplastics; A first seal is arranged between the inner pressure ring, the first split flange and the second split flange; And a first pressing flange is connected to the tops of the first outer housing and the second outer housing to press the inner pressure ring.

9. The double-volute split clamp type pump body according to claim 6, characterized in that: The detachable plugging member includes: two fourth split flanges, which are clamped at the second annular groove and are connected to the first outer housing; A plug is inserted at the first through hole, and the material of the plug is fluoroplastics; A second seal is arranged between the plug and the second outward convex opening; And a second pressing flange is connected to the fourth split flange to press the plug.

10. A centrifugal pump, characterized in that: Adopt a double-volute split clamping type pump body according to any one of claims 1-9, and accommodate an impeller in the medium flow channel formed at the first inner volute and the second inner volute; Connect a bearing seat to the external flange on the second outer housing, and press a pump cover between the bearing seat and the second inner volute; Connect a liquid inlet pipeline to the external flange on the first outer housing; Connect the liquid outlet pipe to the external flange on the tops of the first outer housing and the second outer housing.

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