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

Abstract

The present invention discloses a double-volute half-clamp-type pump body and a centrifugal pump using the pump body, comprising: a first inner volute; a second inner volute, one side wall of the second inner volute is in contact with 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 shell, covering the first inner volute; a second outer shell, covering the second inner volute, the second outer shell is connected to the first outer shell, clamping the first inner volute and the second inner volute; three external flanges, the first external flange is connected to the first outer shell to clamp the first inner volute, the second external flange is connected to the second outer shell to clamp the second inner volute, and the third external flange is connected to the top of the first outer shell and the second outer shell; and a detachable sealing piece is connected to the first outer shell; thereby overcoming the technical problems of relatively poor operating stability, relatively short service life, relatively high maintenance cost, and relatively low efficiency in conveying medium.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, in particular to a double-volute half-wrap type pump body and a centrifugal pump using the pump body. Background Art

[0002] Centrifugal pumps are widely used in chemical, metallurgical, pesticide and other fields. In order to be able to transport highly corrosive media (such as hydrochloric acid, 50% sulfuric acid, etc.), the parts of the centrifugal pump that come into contact with the media are generally made of fluoroplastics.

[0003] The structure of an existing centrifugal pump generally includes: a bearing seat, a pump shaft, a mechanical seal, a pump cover, an impeller and a pump body. The pump shaft is connected to the bearing seat, the mechanical seal is connected between the impeller, the pump cover, the pump shaft and the bearing seat, the pump cover is connected between the bearing seat and the pump body, the impeller is connected to the pump shaft, the pump body is connected to the bearing seat, and the pump body accommodates the impeller.

[0004] Among them, the pump body of the existing centrifugal pump is an integral structure, which has at least the following shortcomings:

[0005] 1. The integral structure makes it inconvenient to process the flow channel on the pump body, resulting in a relatively low finish of the flow channel. The greater the friction resistance between the flow channel and the medium, the lower the efficiency of conveying the medium.

[0006] 2. When operating under non-rated conditions, unbalanced radial forces are likely to be generated in the flow channel, causing vibration and reducing the service life of components such as the pump shaft, bearings and mechanical seals;

[0007] 3. The integral structure usually needs to be replaced as a whole when damaged or repaired, which results in relatively high maintenance costs and relatively low work efficiency. Summary of the Invention

[0008] In view of the above-mentioned deficiencies existing in the related art, the purpose is to provide a double-volute half-wafer pump body and a centrifugal pump using the pump body, so as to solve the technical problems of relatively poor operating stability, relatively short service life, relatively high maintenance cost and relatively low efficiency of conveying medium in the related art;

[0009] The technical solution to achieve the purpose is: a double volute half-wafer type pump body, comprising:

[0010] a first inner volute, wherein the material of the first inner volute is fluoroplastic;

[0011] a second inner volute, wherein the second inner volute is made of fluoroplastic, a side wall of the second inner volute is in contact with a side wall of the first inner volute, and a medium flow channel is formed between the second inner volute and the first inner volute;

[0012] a first outer shell, covering the first inner volute and the other side wall of the first inner volute;

[0013] a second outer shell, covering the second inner volute and the other sidewall of the second inner volute, the second outer shell being connected to the first outer shell to clamp the first inner volute and the second inner volute;

[0014] Three external flanges, the first external flange being connected to the first outer shell to clamp the first inner volute, the second external flange being connected to the second outer shell to clamp the second inner volute, and the third external flange being connected to the tops of the first outer shell and the second outer shell to press the tops of the first inner volute and the second inner volute;

[0015] and a detachable blocking member connected to the first outer shell and used for blocking a first through hole on the first inner volute, wherein the first through hole is in communication with the medium flow channel.

[0016] Furthermore: the first inner volute includes: a first volute body, the first volute body having a first concave space;

[0017] a first arc-shaped dividing block connected to the first volute body, disposed in the first concave space, and dividing a portion of the first concave space into a first flow channel and a second flow channel;

[0018] a first convex edge arranged along an outer edge of the first volute body;

[0019] a groove, provided on a side wall of the first volute body and the first convex edge;

[0020] a first external convex opening, provided on the other side wall of the first volute body, passing through the first outer shell, the first external convex opening being in communication with the first inner concave space, and having a first annular groove on the first external convex opening, the external flange being clamped at the first annular groove;

[0021] a first half flange, disposed on the top of the first volute body and engaging with the top of the first outer shell;

[0022] And a second outer protrusion is arranged on the other side wall of the first volute body, spaced apart from the first outer protrusion, the second outer protrusion has the first through hole, the second outer protrusion has a second annular groove, and the removable sealing member is arranged at the second outer protrusion.

[0023] Furthermore: the second inner volute includes: a second volute body, the second volute body has a second concave space, and the second concave space and the first concave space together form the medium flow channel;

[0024] a second arc-shaped dividing block connected to the second volute body and disposed in the second concave space to divide a portion of the second concave space into a third flow channel and a fourth flow channel, wherein 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;

[0025] a second convex edge arranged along an outer edge of the second volute body;

[0026] a boss, provided on one side wall of the second volute body and the second convex edge, for engaging with the groove;

[0027] a third external convex opening, provided on the other side wall of the second volute body, passing through the second outer shell, the third external convex opening being in communication with the second inner concave space, and having a third annular groove on the third external convex opening, the external flange being clamped in the third annular groove;

[0028] and a second half flange, which is arranged on the top of the second volute body and engages with the top of the second outer shell, and the second half flange is combined with the first half flange to form a complete flange.

[0029] Furthermore: when the first outer shell and the second outer shell together clamp the first inner volute and the second inner volute, a gap exists between the first outer shell and the second outer shell;

[0030] The first outer shell and the second outer shell are connected by a plurality of bolts.

[0031] Furthermore, the first outer shell or the second outer shell includes: an outer shell body, accommodating the first volute body, the first flange, and the first half-flange, or accommodating the second volute body, the second flange, and the second half-flange, the outer shell body having a second through hole, and the second through hole is penetrated by the first outer protrusion or the third outer protrusion;

[0032] A plurality of reinforcing ribs are evenly distributed on one side wall of the shell body;

[0033] Two half-hanging blocks are connected to the shell body at intervals, and the half-hanging blocks have a third through hole;

[0034] and two half-support frames, which are connected to the shell body at intervals and are arranged at intervals with the half-lifting blocks.

[0035] Furthermore: the shell body on the first shell body also has a fourth through hole, and the fourth through hole is penetrated by the second outer protrusion.

[0036] Furthermore: the first external flange has the same structure as the second external flange, and both include: two third half flanges, the local cross-section of the third half flange is an "L"-shaped structure, which is stuck in the first annular groove or the third annular groove.

[0037] Furthermore: the third external flange includes: an inner pressure ring, which is arranged on the top of the first half flange and the second half flange, and the middle position is connected to the medium flow channel, and the material of the inner pressure ring is fluoroplastic;

[0038] a first sealing member, disposed between the inner pressure ring, the first half flange, and the second half flange;

[0039] And a first pressing flange is connected to the top of the first outer shell and the second outer shell to press the inner pressure ring.

[0040] Furthermore: the detachable sealing member includes: two fourth half flanges, which are clamped in the second annular groove and connected to the first outer shell;

[0041] A plugging member is plugged into the first through hole, and the plugging member is made of fluoroplastic;

[0042] a second sealing member disposed between the plug and the second outer protrusion;

[0043] And a second pressing flange is connected to the fourth half flange to press the seal.

[0044] A centrifugal pump adopts the double-volute half-wafer-type pump body, wherein the impeller is accommodated in the medium flow channel formed by the first inner volute and the second inner volute;

[0045] Connecting a bearing seat to the external flange on the second outer shell, and pressing a pump cover between the bearing seat and the second inner volute;

[0046] Connecting a liquid inlet pipeline to the external flange on the first outer shell;

[0047] The liquid outlet pipe is connected to the external flanges on the top of the first outer shell and the second outer shell.

[0048] The above technical solution has the following beneficial effects: a double-volute half-wafer pump body and a centrifugal pump using the pump body, compared with the related art, are provided with a first inner volute, a second inner volute, a first outer shell, a second outer shell, an external flange and a detachable sealing member;

[0049] The first inner volute is made of fluoroplastic, and the second inner volute is made of fluoroplastic. One side wall of the second inner volute is fitted with 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. The second outer shell is connected to the first outer shell, clamping the first inner volute and the second inner volute. The external flange is connected to the second outer shell and the first outer shell, and the detachable sealing piece is connected to the first outer shell. Since each component is separately arranged, assembly is relatively convenient, and it is conducive to forming a medium flow channel between the second inner volute and the first inner volute, and fine processing is performed, which improves the smoothness of the medium flow channel, has relatively high efficiency in conveying the medium, reduces the probability of generating unbalanced radial force, reduces vibration, has relatively good operating stability, has relatively low maintenance cost, and extends service life;

[0050] This overcomes the technical problems of relatively poor operating stability, relatively short service life, relatively high maintenance costs, and relatively low efficiency of the conveying medium, and achieves the technical effects of relatively good operating stability, extended service life, relatively low maintenance costs, and relatively high efficiency of the conveying medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a partial cross-sectional view of a double-volute half-wafer pump body;

[0052] Figure 2 This is a three-dimensional structural diagram of a double-volute half-wafer pump body;

[0053] Figure 3 A partial cross-sectional view of a third external flange connected to the top of the first outer shell and the second outer shell;

[0054] Figure 4 An exploded view of the first inner volute, the second inner volute, the first outer shell and the second outer shell;

[0055] Figure 5 This is one of the structural diagrams of the first inner volute;

[0056] Figure 6 This is the second structural diagram of the first inner volute;

[0057] Figure 7 This is one of the structural diagrams of the second inner volute;

[0058] Figure 8 This is the second structural diagram of the second inner volute;

[0059] Figure 9 This is a structural diagram of the first outer shell;

[0060] Figure 10 This is the second structural diagram of the first outer shell;

[0061] Figure 11 is a structural schematic diagram of the second outer shell;

[0062] Figure 12 This is a partial cross-sectional view of the double-volute half-wafer pump body after assembly with the impeller, bearing seat and pump cover;

[0063] Figure 13 for Figure 12 A partial enlarged schematic diagram of part A in FIG;

[0064] In the figure: 10. First inner volute, 11. First through hole, 10-1. First volute body, 10-11. First concave space, 10-2. First arc-shaped dividing block, 10-11-1. First flow channel, 10-11-2. Second flow channel, 10-3. First convex edge, 10-4. Groove, 10-5. First outer convex opening, 10-51. First annular groove, 10-6. First half-flange, 10-7. Second outer convex opening, 10-71. Second annular groove, 20. Second inner volute, 20-1. Second volute body, 20-11. Second concave space, 20-11-1. Third flow channel, 20-11-2. Fourth flow channel, 20-2. Second arc-shaped dividing block, 20-3. Second convex edge, 20-4. Boss, 2 0-5. Third external protrusion, 20-51. Third annular groove, 20-6. Second half flange, 1020. Medium circulation channel, 30. First outer shell, 30-1. Shell body, 30-11. Second through hole, 30-12. Fourth through hole, 30-2. Reinforcement rib, 30-3. Half lifting block, 30-31. Third through hole, 30-4. Half support frame, 40. Second outer shell, 50. External flange, 50-1. Inner pressure ring, 50-2. First sealing member, 50-3. First clamping flange, 60. Removable sealing member, 60-1. Fourth half flange, 60-2. Seal, 60-3. Second sealing member, 60-4. Second clamping flange, 100. Impeller, 200. Bearing seat, 300. Pump cover. DETAILED DESCRIPTION

[0065] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings;

[0066] A double-volute half-wafer pump body and a centrifugal pump using the pump body solve the technical problems of relatively poor operating stability, relatively short service life, relatively high maintenance cost, and relatively low efficiency of conveying medium in related technologies. The positive effects of relatively good operating stability, extended service life, relatively low maintenance cost, and relatively high efficiency of conveying medium are achieved. The overall concept is as follows: Example 1

[0067] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 12 As shown; a double volute half-wafer pump body and a centrifugal pump using the pump body, the double volute half-wafer pump body comprises: a first inner volute 10, the material of the first inner volute 10 is fluoroplastic;

[0068] A second inner volute 20 is made of fluoroplastic, a sidewall of the second inner volute 20 is in contact with a sidewall 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;

[0069] A first outer shell 30 is covered on the first inner volute 10 and covers the other side wall of the first inner volute 10;

[0070] A second outer shell 40 is covered on the second inner volute 20 and covers the other side wall of the second inner volute 20. The second outer shell 40 is connected to the first outer shell 30 to clamp the first inner volute 10 and the second inner volute 20;

[0071] Three external flanges 50, the first external flange 50 is connected to the first outer shell 30, clamping the first inner volute 10, the second external flange 50 is connected to the second outer shell 40, clamping the second inner volute 20, and the third external flange 50 is connected to the top of the first outer shell 30 and the second outer shell 40, pressing the top of the first inner volute 10 and the second inner volute 20;

[0072] and a detachable blocking member 60 connected to the first outer shell 30 for blocking the first through hole 11 on the first inner volute 10 , the first through hole 11 being in communication with the medium flow channel 1020 ;

[0073] The centrifugal pump adopts the double-volute half-wafer pump body, and the impeller 100 is accommodated in the medium flow channel 1020 formed by the first inner volute 10 and the second inner volute 20;

[0074] Connect the bearing seat 200 to the external flange 50 on the second outer shell 40, and press the pump cover 300 between the bearing seat 200 and the second inner volute 20;

[0075] Connecting a liquid inlet pipeline to the external flange 50 on the first outer shell 30;

[0076] Connecting a liquid outlet pipe to the external flange 50 on the top of the first outer shell 30 and the second outer shell 40;

[0077] Specifically, during implementation, the first inner volute 10 is made of fluoroplastic, and the second inner volute 20 is made of fluoroplastic. One side wall of the second inner volute 20 is in contact with 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 medium flow channel 1020 is conducive to the smooth flow of the medium, and the fluoroplastic material has relatively good anti-corrosion performance.

[0078] The second outer shell 40 is connected to the first outer shell 30, clamping the first inner volute 10 and the second inner volute 20, so that the medium will not leak. In addition, the separate arrangement makes assembly relatively convenient and also facilitates fine processing of the second inner volute 20 and the first inner volute 10. The resulting medium flow channel has a relatively high finish, a relatively high efficiency in conveying the medium, and a reduced probability of generating unbalanced radial forces, reduced vibration, relatively good operational stability, relatively low maintenance costs, and extended service life.

[0079] The external flange 50 is connected to the second outer shell 40 and the first outer shell 30, which not only improves the reliability of the structure, but also facilitates assembly with other components (such as the bearing seat 200, the liquid outlet pipe and the liquid inlet pipe), making assembly relatively convenient;

[0080] The detachable blocking member 60 is connected to the first outer shell 30. When cleaning is required, the detachable blocking member 60 can be opened to flush the medium flow channel 1020, which is relatively convenient to use. Example 2

[0081] like 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 body 10-1, which has a first concave space 10-11; a first arc-shaped dividing block 10-2, which is connected to the first volute body 10-1 and is 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, which is arranged along the outer edge of the first volute body 10-1; a groove 10-4, which is arranged on one side wall of the first volute body 10-1 and the first convex edge 10-3; a first outer convex opening 10-5, which is arranged on the other side wall of the first volute body 10-1, passing through the first outer convex opening The housing 30, the first outer protrusion 10-5 is connected to the first inner concave space 10-11, and the first outer protrusion 10-5 has a first annular groove 10-51, and the external flange 50 is clamped at the first annular groove 10-51; the first half flange 10-6 is provided on the top of the first volute body 10-1 and is engaged with the top of the first outer shell 30; and the second outer protrusion 10-7 is provided on the other side wall of the first volute body 10-1, spaced apart from the first outer protrusion 10-5, the second outer protrusion 10-7 has the first through hole 11, the second outer protrusion 10-7 has a second annular groove 10-71, and the removable blocking member 60 is provided at the second outer protrusion 10-7;

[0082] The first inner volute 10 is made of fluoroplastic, which improves the corrosion resistance;

[0083] The first volute body 10-1, the first arc-shaped partition block 10-2, the first flange 10-3, the groove 10-4, the first external protrusion 10-5, the first half flange 10-6 and the second external protrusion 10-7 are integrally injection-molded;

[0084] The outer shape of the first volute body 10 - 1 is roughly a “b”-shaped structure, and the first concave space 10 - 11 formed therein is roughly a “b”-shaped structure;

[0085] The first arc-shaped dividing block 10-2 is substantially in an "S"-shaped structure, dividing a portion of the first concave space 10-11 into a first flow channel 10-11-1 and a second flow channel 10-11-2;

[0086] A first convex edge 10 - 3 is provided to increase the contact area with the first outer shell 30 ;

[0087] A groove 10 - 4 is provided for cooperating with the boss 20 - 4 , which facilitates the fitting of the first inner volute 10 and the second inner volute 20 ;

[0088] The first outer protrusion 10-5 is an annular structure with a first annular groove 10-51, which is conducive to clamping the external flange 50;

[0089] A first half flange 10-6 is provided to increase the contact area with the first outer shell 30;

[0090] A second outer protrusion 10-7 is provided to facilitate connection of the detachable blocking member 60;

[0091] The second inner volute 20 comprises: a second volute body 20-1, the second volute body 20-1 having a second concave space 20-11, the second concave space 20-11 and the first concave space 10-11 forming the medium flow channel 1020; a second arc-shaped dividing block 20-2, connected to the second volute body 20-1, arranged in the second concave space 20-11, dividing a part of the second 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 being aligned and connected to the first flow channel 10-11-1, and the fourth flow channel 20-11-2 being aligned and connected to the second flow channel 10-11-2; a second convex edge 20-3, extending along the second volute body 20 -1 is arranged on the outer edge of the second volute body 20-1; the boss 20-4 is provided on one side wall of the second volute body 20-1 and the second flange 20-3, and is used to engage with the groove 10-4; the third outer convex opening 20-5 is provided on the other side wall of the second volute body 20-1, passing through the second outer shell 40, the third outer convex opening 20-5 is connected to the second concave space 20-11, and the third outer convex opening 20-5 has a third annular groove 20-51, and the external flange 50 is clamped at the third annular groove 20-51; and the second half flange 20-6 is provided on the top of the second volute body 20-1, and is engaged with the top of the second outer shell 40, and the second half flange 20-6 and the first half flange 10-6 are combined into a complete flange;

[0092] The second inner volute 20 is made of fluoroplastic, which improves the corrosion resistance;

[0093] The second volute body 20-1, the second arc-shaped partition block 20-2, the second flange 20-3, the boss 20-4, the third outer protrusion 20-5 and the second half flange 20-6 are integrally injection-molded;

[0094] The outer shape of the second volute body 20 - 1 is roughly a “b”-shaped structure, and the second concave space 20 - 11 formed therein is roughly a “b”-shaped structure;

[0095] The second arc-shaped partition block 20-2 is substantially in an "S" shape, which divides a portion of the second concave space 20-11 into a third flow channel 20-11-1 and a fourth flow channel 20-11-2;

[0096] 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, so that a portion of the medium flow channel 1020 is divided into two medium flow channels. When the medium enters the medium flow channel 1020 through the first outer protrusion 10-5, it flows out along the medium flow channel 1020 through the 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). The medium flow channels have a flow-guiding effect, making the medium flow relatively stable, reducing the probability of generating unbalanced radial forces, and reducing vibration.

[0097] A second convex edge 20 - 3 is provided to increase the contact area with the second outer shell 40 ;

[0098] When the second outer shell 40 is connected to the first outer shell 30 and the first inner volute 10 and the second inner volute 20 are clamped, the first flange 10 - 3 and the second flange 20 - 3 are conducive to improving the clamping effect;

[0099] A boss 20-4 is provided for cooperating with the groove 10-4, which facilitates the fit between the first inner volute 10 and the second inner volute 20 and reduces the chance of leakage;

[0100] The third outer protrusion 20 - 5 is an annular structure with a third annular groove 20 - 51 , which is conducive to clamping the external flange 50 ;

[0101] A second half flange 20-6 is provided to increase the contact area with the second outer shell 40. The second half flange 20-6 and the first half flange 10-6 are combined into a complete flange, which is conducive to the second outer shell 40 and the first outer shell 30 clamping the first inner volute 10 and the second inner volute 20 together;

[0102] The first inner volute 10 and the second inner volute 20 are arranged as a half structure (split structure), which is conducive to using a CNC machining center to fine-process the first concave space 10-11, the first arc-shaped dividing block 10-2, the groove 10-4, the second concave space 20-11, the second arc-shaped dividing block 20-2 and the boss 20-4, so that the medium flow channel 1020 has a higher smoothness, for example: the smoothness is about 1.6 or 2.5. Compared with the integral structure, the integral structure of the volute is difficult to fine-process the medium flow channel 1020. The smoothness of the flow channel is usually the smoothness during injection molding, and the general smoothness is about 6.3 or 12.5. The higher the smoothness, the smaller the friction resistance between the medium and the medium at the medium flow channel 102, thereby improving the efficiency of conveying the medium (generally the efficiency is improved by about 15%), and the medium flows more smoothly, reducing the probability of generating unbalanced radial force and reducing vibration; Example 3

[0103] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown; in implementation, when the first outer shell 30 and the second outer shell 40 together clamp the first inner volute 10 and the second inner volute 20, a gap is formed between the first outer shell 30 and the second outer shell 40; the first outer shell 30 and the second outer shell 40 are connected by a plurality of bolts;

[0104] A gap is provided, for example, a gap of five millimeters, which facilitates tightening the first outer shell 30 and the second outer shell 40 by bolts (for example, hexagonal bolts), so that the first inner volute 10 and the second inner volute 20 fit tightly together and the medium flow channel 1020 does not leak;

[0105] The split structure (split structure) of the first outer shell 30 and the second outer shell 40 is relatively easy to assemble, and when a part is damaged, only part needs to be replaced, so the maintenance cost is relatively low;

[0106] wherein the first outer shell 30 or the second outer shell 40 comprises: an outer shell body 30-1, accommodating the first volute body 10-1, the first flange 10-3 and the first half-flange 10-6, or accommodating the second volute body 20-1, the second flange 20-3 and the second half-flange 20-6, the outer shell body 30-1 having a second through hole 30-11, the second through hole 30-11 being passed through by the first outer protrusion 10-5 or the third outer protrusion 20-5; a plurality of reinforcing ribs 30-2, uniformly distributed on one side wall of the outer shell body 30-1; two half-hanging blocks 30-3, spaced apart from each other on the outer shell body 30-1, each half-hanging block 30-3 having a third through hole 30-31; and two half-support frames 30-4, spaced apart from each other on the outer shell body 30-1 and spaced apart from the half-hanging blocks 30-3;

[0107] A housing 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;

[0108] Reinforcement ribs 30-2 are provided to improve structural strength;

[0109] A half-lifting block 30-3 is provided, which is conducive to hooking the hook at the third through hole 30-31, making lifting relatively convenient;

[0110] The provision of a half support frame 30-4 facilitates connection with the pump base plate (the pump base plate is a common structure in the prior art) via bolts, making assembly relatively easy. After reading the disclosed content, a person skilled in the art can directly and unambiguously know how to set it up without having to make any creative efforts or conduct excessive experiments.

[0111] The housing body 30-1 of the first housing 30 further has a fourth through hole 30-12, and the fourth through hole 30-12 is passed through by the second outer protrusion 10-7, so that assembly is relatively convenient; Example 4

[0112] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 12 As shown; in implementation, the first external flange 50 has the same structure as the second external flange 50, both comprising: two third half flanges, the partial cross-section of the third half flange being an "L"-shaped structure, which is stuck in the first annular groove 10-51 or the third annular groove 20-51;

[0113] The first external flange 50 is used to connect the liquid inlet pipeline through bolts, and the assembly is relatively easy;

[0114] The second external flange 50 is used to connect the bearing seat 200 via bolts, which makes assembly relatively easy;

[0115] The third external flange 50 includes: an inner pressure ring 50-1, which is arranged on the top of the first half flange 10-6 and the second half flange 20-6, and the middle position is connected to the medium flow channel 1020, and the material of the inner pressure ring 50-1 is fluoroplastic; a first sealing member 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 clamping flange 50-3, which is connected to the top of the first outer shell 30 and the second outer shell 40 to press the inner pressure ring 50-1;

[0116] The material of the inner pressure ring 50-1 is fluoroplastic, which has relatively good corrosion resistance;

[0117] The first sealing member 50 - 2 is an O-ring;

[0118] The first compression flange 50-3 is connected to the first outer shell 30 and the second outer shell 40 by bolts, compressing the inner pressure ring 50-1 and being used to connect the liquid outlet pipe by bolts, which is relatively easy to assemble;

[0119] Three external flanges 50 are provided, and the external flanges 50 are respectively connected to different positions on the second outer shell 40 and the first outer shell 30, which not only improves the reliability of the structure, but also facilitates assembly with other components (such as the bearing seat 200, the liquid outlet pipe and the liquid inlet pipe), and the assembly is relatively convenient; Example 5

[0120] like Figure 1 、 Figure 12 、 Figure 13 As shown; when implemented, the detachable sealing member 60 includes: two fourth half flanges 60-1, which are clamped in the second annular groove 10-71 and connected to the first outer shell 30; a sealing member 60-2, which is inserted into the first through hole 11 and is made of fluoroplastic; a second sealing member 60-3, which is arranged between the sealing member 60-2 and the second outer protrusion 10-7; and a second pressing flange 60-4, which is connected to the fourth half flange 60-1 and presses the sealing member 60-2;

[0121] The fourth half flange 60 - 1 is clamped in the second annular groove 10 - 71 and is connected to the first outer shell 30 by bolts, so the assembly is relatively convenient.

[0122] The plug 60 - 2 has a “T”-shaped structure and is used to block the first through hole 11 ;

[0123] The second sealing member 60 - 3 is an O-ring;

[0124] The second compression flange 60-4 is connected to the fourth half flange 60-1 by bolts, and is used to compress and seal the 60-2;

[0125] The detachable blocking member 60 is connected to the first outer shell 30, so that no medium will leak from the first through hole 11. When cleaning is required, the detachable blocking member 60 can be opened to flush the medium flow channel 1020. The obstruction in the medium flow channel 1020 flows out from the first through hole 11 without removing the bearing seat 200, which is relatively convenient to use.

[0126] About the structure of centrifugal pump:

[0127] See Figure 12 The centrifugal pump includes: a double volute half-wafer type pump body, an impeller 100, a bearing seat 200, a pump cover 300, a pump shaft and a mechanical seal;

[0128] The pump shaft is connected to the bearing seat 200, the mechanical seal is connected between the impeller 100, the pump cover 300, the pump shaft and the bearing seat 200, the pump cover 300 is connected between the bearing seat 200 and the pump body, the impeller 100 is connected to the pump shaft, the pump body is connected to the bearing seat 200, the impeller 100 is accommodated in the pump body, the motor drives the pump shaft to rotate, and the impeller 100 rotates with the pump shaft. The medium follows the liquid inlet pipeline and enters the medium circulation channel 1020 from the first external protrusion 10-5. Along the medium circulation channel 1020, it 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 pipe;

[0129] About the assembly method of double volute half wafer type pump body:

[0130] 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 fits with one side wall of the second inner volute 20 ;

[0131] Step 2. Assemble the first outer casing 30 and the first inner volute 10;

[0132] Step 3. Assemble the second outer shell 40 and the second inner volute 20. After alignment, tighten the first outer shell 30 and the second outer shell 40 with bolts;

[0133] Step 4. Assemble the external flange 50;

[0134] Step 5. Assemble the detachable blocking member 60;

[0135] Step 6. Check the assembly position to ensure it is properly assembled.

[0136] After reading the disclosed content, a person skilled in the art can directly and unambiguously know how to set up a centrifugal pump without any creative effort or excessive experimentation.

[0137] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the positional relationships shown in the drawings and are only used to facilitate or simplify the description, and do not indicate specific directions that must be maintained. The operating procedures described in the embodiments are not absolute steps for use and may be adjusted accordingly in actual use.

[0138] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the relevant art. The terms "first," "second," and similar words used in the specification and claims do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "an" and similar words do not necessarily indicate a limit on quantity, but rather indicate the presence of at least one, which shall be determined based on the content of the embodiments.

[0139] The above is only a preferred specific implementation method, but the scope of protection is not limited to this. Any equivalent replacement or change within the technical scope disclosed by technicians familiar with this technical field based on the technical solution and its inventive concept should be covered by the scope of protection.

Claims

1. A double volute half-wafer type pump body, characterized in that: include: a first inner volute, wherein the material of the first inner volute is fluoroplastic; a second inner volute, wherein the second inner volute is made of fluoroplastic, a side wall of the second inner volute is in contact with a 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 shell, covering the first inner volute and the other side wall of the first inner volute; a second outer shell, covering the second inner volute and the other sidewall of the second inner volute, the second outer shell being connected to the first outer shell to clamp the first inner volute and the second inner volute; Three external flanges, the first external flange being connected to the first outer shell to clamp the first inner volute, the second external flange being connected to the second outer shell to clamp the second inner volute, and the third external flange being connected to the tops of the first outer shell and the second outer shell to press the tops of the first inner volute and the second inner volute; and a detachable blocking member connected to the first outer shell and used to block a first through hole on the first inner volute, the first through hole being in communication with the medium flow channel; The first inner volute comprises: a first volute body, the first volute body having a first concave space; a first arc-shaped dividing block connected to the first volute body, disposed in the first concave space, and dividing a portion of the first concave space into a first flow channel and a second flow channel; a first convex edge arranged along an outer edge of the first volute body; a groove, provided on a side wall of the first volute body and the first convex edge; a first external convex opening, provided on the other side wall of the first volute body, passing through the first outer shell, the first external convex opening being in communication with the first inner concave space, and having a first annular groove on the first external convex opening, the external flange being clamped at the first annular groove; a first half flange, disposed on the top of the first volute body and engaging with the top of the first outer shell; and a second outer convex opening, provided on the other side wall of the first volute body, spaced apart from the first outer convex opening, the second outer convex opening having the first through hole, the second outer convex opening having a second annular groove, and the second outer convex opening being provided with the detachable blocking member; The second inner volute comprises: a second volute body, the second volute body having a second concave space, the second concave space and the first concave space forming the medium flow channel; a second arc-shaped dividing block connected to the second volute body and disposed in the second concave space to divide a portion of the second concave space into a third flow channel and a fourth flow channel, wherein 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 arranged along an outer edge of the second volute body; a boss, provided on one side wall of the second volute body and the second convex edge, for engaging with the groove; a third external convex opening, provided on the other side wall of the second volute body, passing through the second outer shell, the third external convex opening being in communication with the second inner concave space, and having a third annular groove on the third external convex opening, the external flange being clamped in the third annular groove; and a second half flange, disposed on the top of the second volute body, engaging with the top of the second outer shell, and the second half flange and the first half flange are combined into a complete flange; When the first outer shell and the second outer shell together clamp the first inner volute and the second inner volute, a gap is formed between the first outer shell and the second outer shell; The first outer shell and the second outer shell are connected by a plurality of bolts; The first outer shell or the second outer shell comprises: an outer shell body, accommodating the first volute body, the first flange, and the first half-flange, or accommodating the second volute body, the second flange, and the second half-flange, the outer shell body having a second through hole, the second through hole being penetrated by the first outer protrusion or the third outer protrusion; A plurality of reinforcing ribs are evenly distributed on one side wall of the shell body; Two half-hanging blocks are connected to the shell body at intervals, and the half-hanging blocks have a third through hole; and two half-support frames, which are connected to the shell body at intervals and are arranged at intervals with the half-lifting blocks.

2. A double volute half-wafer type pump body according to claim 1, characterized in that: The shell body on the first shell further has a fourth through hole, and the fourth through hole is penetrated by the second outer protrusion.

3. The double-volute half-wafer pump body according to claim 1, characterized in that: The first external flange has the same structure as the second external flange, and both include: two third half flanges, the local cross-section of the third half flange is an "L"-shaped structure, which is stuck in the first annular groove or the third annular groove.

4. The double volute half-wafer type pump body according to claim 3, characterized in that: The third external flange includes: an inner pressure ring, which is arranged on the top of the first half flange and the second half flange, and the middle position is connected to the medium flow channel, and the material of the inner pressure ring is fluoroplastic; a first sealing member, disposed between the inner pressure ring, the first half flange, and the second half flange; And a first pressing flange is connected to the top of the first outer shell and the second outer shell to press the inner pressure ring.

5. The double volute half-wafer type pump body according to claim 1, characterized in that: The detachable sealing member includes: two fourth half flanges, which are clamped in the second annular groove and connected to the first outer shell; A plugging member is plugged into the first through hole, and the plugging member is made of fluoroplastic; a second sealing member disposed between the plug and the second outer protrusion; And a second pressing flange is connected to the fourth half flange to press the seal.

6. A centrifugal pump, characterized in that: A double-volute half-wafer pump body according to any one of claims 1 to 5 is used, wherein the impeller is accommodated in the medium flow channel formed by the first inner volute and the second inner volute; Connecting a bearing seat to the external flange on the second outer shell, and pressing a pump cover between the bearing seat and the second inner volute; Connecting a liquid inlet pipeline to the external flange on the first outer shell; The liquid outlet pipe is connected to the external flanges on the top of the first outer shell and the second outer shell.

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