A double-volute split-jaw fluoroplastic centrifugal pump

Abstract

This utility model discloses a double-volute split-half clamping fluoroplastic centrifugal pump, comprising: a pump body; a bearing housing, one end of which is connected to the pump body; a main shaft, connected to the bearing housing, one end of which extends into the pump body and the other end protrudes from the bearing housing; a pump cover, disposed between the pump body and the bearing housing; an impeller, connected to one end of the main shaft, disposed within the pump body, spaced apart from the pump body and the pump cover; a locking element, connected to one end of the main shaft, for pressing the impeller; a nut, connected to the impeller; and a main seal, disposed between the bearing housing, the main shaft, the pump cover, and the impeller; the pump body includes: a split-half inner volute, having an inner space and dual flow channels, the inner space communicating with the dual flow channels; a split-half outer clamping shell for clamping the split-half inner volute; and a flange, connected to the split-half outer clamping shell, for locking the split-half inner volute; overcoming the technical problems of unbalanced radial forces easily generated at the flow channels, relatively poor operational stability, reduced service life, and relatively low efficiency in conveying the medium.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, specifically a double volute split-clamp type fluoroplastic centrifugal pump. Background Technology

[0002] Centrifugal pumps operate on the principle of centrifugal force generated by the rotation of an object. When the pump body is filled with medium, the impeller rotates and generates centrifugal force. The medium is thrown towards the outer pump body by the centrifugal force, which causes the pressure at the center of the impeller to decrease. This pressure is lower than the pressure of the liquid surface in the inlet pool. Under the action of the pressure difference, the medium enters the impeller from the suction pool, thereby realizing the continuous suction and discharge of the medium and completing the transportation of the medium.

[0003] To improve corrosion resistance, fluoroplastics are used in the parts of centrifugal pumps that come into contact with the medium. However, existing fluoroplastic centrifugal pumps have some shortcomings:

[0004] 1. The pump body is a single-piece structure, which makes it inconvenient to process the flow channels on the pump body. This results in a relatively low surface finish of the flow channels, which increases the frictional resistance between the flow channels and the medium, reducing the efficiency of conveying the medium. Moreover, when damaged or under maintenance, the entire pump body usually needs to be replaced, resulting in relatively high maintenance costs.

[0005] 2. The flow channel on the pump body is a single flow channel structure. When operating under non-rated conditions, unbalanced radial forces are easily generated in the flow channel, which reduces the service life of components such as bearings and mechanical seals. Utility Model Content

[0006] In view of the above-mentioned shortcomings in the related technologies, the purpose is to provide a double volute split-jaw fluoroplastic centrifugal pump to solve the technical problems of unbalanced radial force easily generated in the flow channel, relatively poor operational stability, reduced service life, and relatively low efficiency in conveying media in the related technologies.

[0007] The technical solution to achieve the objective is: a double-volute split-jaw fluoroplastic centrifugal pump, comprising:

[0008] Pump body;

[0009] The bearing housing is connected to the pump body at one end;

[0010] The main shaft is connected to the bearing housing, with one end extending into the pump body and spaced apart from the pump body, and the other end protruding from the bearing housing.

[0011] A pump cover is disposed between the pump body and the bearing housing, surrounding one end of the main shaft and spaced apart from the main shaft;

[0012] An impeller is connected to one end of the main shaft, disposed within the pump body, and spaced apart from the pump body and the pump cover.

[0013] A locking element, connected to one end of the main shaft, presses the impeller;

[0014] Nuts are attached to the impeller;

[0015] And the main seal is disposed between the bearing housing, the main shaft, the pump cover and the impeller;

[0016] The pump body includes: a split inner volute, the split inner volute being made of fluoroplastic and having an inner space and dual flow channels, the inner space communicating with the dual flow channels and accommodating the impeller; a split outer clamping shell for clamping the split inner volute; and three flanges connected to the split outer clamping shell to hold the split inner volute in place.

[0017] Furthermore: the split inner volute includes: a first half volute, the first half volute having a first half inner space and two first half flow channels, the first half inner space communicating with the first half flow channels;

[0018] And a second half-volute, one side wall of the second half-volute is connected to one side wall of the first half-volute, the second half-volute has a second half-inner space and two second half-flow channels, the second half-inner space is connected to the second half-flow channels, the second half-inner space and the first half-inner space form the inner space, and the second half-flow channels and the first half-flow channels form the dual flow channels.

[0019] Furthermore: the first half-volute or the second half-volute includes: a volute housing having a first half-inner space and a first half-flow channel, or having a second half-inner space and a second half-flow channel, and after the two volute housings are connected, a first annular groove is provided on the top, and a flange is provided at the first annular groove;

[0020] And an annular opening is provided in the middle of the volute housing, directly communicating with the first half of the inner space or the second half of the inner space, and the outer circle of the annular opening has a second annular groove, and a flange is provided at the second annular groove.

[0021] Furthermore: the first half of the volute also has a cylindrical protrusion, which is disposed on the volute and spaced apart from the annular opening;

[0022] The cylindrical protrusion has a first through hole, which is directly connected to the dual flow channels;

[0023] The outer circumference of the cylindrical protrusion has a third annular groove.

[0024] Furthermore: the split outer shell includes: a first half shell; a second half shell, which together with the first half shell clamps the first half shell and the second half shell; and a plurality of locking bolts connecting the first half shell and the second half shell;

[0025] The first half-shell or the second half-shell includes: a shell body that accommodates the volute shell, and a second through hole at the middle position of the shell body, the second through hole being penetrated by the annular tube opening;

[0026] Several reinforcing ribs are connected at intervals to the outer wall of the shell body;

[0027] Two split lifting blocks are connected at intervals to the outer wall of the shell body, and each lifting block has a third through hole;

[0028] And two split support frames, which are connected at intervals to the outer wall of the shell body and are spaced apart from the split lifting blocks;

[0029] The shell body on the first half-shell also has a fourth through hole, which is penetrated by the cylindrical protrusion.

[0030] Furthermore: the pump body also has a sealing component connected to the split outer shell and the cylindrical protrusion, used to seal the first through hole;

[0031] The sealing component includes: two first split flanges, which are engaged in the third annular groove and connected to the split outer shell;

[0032] A sealing block is inserted into the first through hole, and the sealing block is made of fluoroplastic.

[0033] A first sealing element is disposed between the sealing block and the cylindrical protrusion;

[0034] And a clamping flange, connected to the first split flange, to press down the sealing block.

[0035] Furthermore: the bearing housing includes: a housing body, wherein the housing body has a first stepped through hole at the middle position;

[0036] The first bearing is connected to one end of the housing and is disposed in the first stepped through hole;

[0037] Two second bearings are connected to the other end of the housing, are disposed in the first stepped through hole, are spaced apart from the first bearing, and are connected to the main shaft together with the first bearing;

[0038] Two locking nuts are connected to the main shaft to limit the second bearing;

[0039] The first pressure cap is connected to the housing and presses down the first bearing;

[0040] A second seal is disposed between the first gland and the main shaft;

[0041] The second pressure cap is connected to the housing and presses down the second bearing;

[0042] A third sealing element is disposed between the second gland and the main shaft;

[0043] The main sealing gasket is connected to the housing, surrounds the first pressure cover, and is spaced apart from the first pressure cover.

[0044] The intermediate support is connected to the housing at one end and surrounds the main sealing gasket at the other end, pressing against the pump cover and connecting to the flange.

[0045] And a support leg, which is connected to the other end of the housing.

[0046] Furthermore: the pump cover includes: a first body;

[0047] The first inlay, made of fluoroplastic, covers a portion of the first body and is used to contact the medium;

[0048] And two fourth seals, spaced apart and connected to the first insert, forming a seal with the pump body.

[0049] Furthermore: the impeller includes: a second body, the second body having a second stepped through hole at the middle position, the second stepped through hole being fitted onto one end of the main shaft, and the nut being threadedly connected to the second stepped through hole;

[0050] The second insert, made of fluoroplastic, covers the outer edge of the second body and is used to contact the medium;

[0051] Several main blades, made of fluoroplastic, are evenly distributed on one side of the second inlay;

[0052] Several secondary blades, made of fluoroplastic, are evenly distributed on the other side of the second inlay;

[0053] And two fifth seals, spaced apart on the second insert, forming a seal with the main seal.

[0054] Furthermore: the nut includes: a third body, which is threadedly connected to the impeller, covers the locking member, and is spaced apart from the locking member;

[0055] The third inlay, made of fluoroplastic, covers the outer wall of the third main body;

[0056] And a sixth seal is disposed on the third insert to form a seal with the impeller.

[0057] The above technical solution has the following beneficial effects: A double volute split-jaw fluoroplastic centrifugal pump, compared with related technologies, is equipped with a pump body, bearing housing, main shaft, pump cover, impeller, locking parts, nuts and main seals.

[0058] The pump body includes: a split inner volute, a split outer jacket, and flanges. The pump body has a split assembly structure, which is relatively easy to assemble. Moreover, when damaged or under maintenance, it does not need to be replaced as a whole, which reduces maintenance costs and extends service life.

[0059] During operation, the main shaft is rotated by the motor, and the impeller, nut, and locking parts rotate together with the main shaft. The medium enters the inner space of the split inner volute and is discharged through the dual flow channels. Due to the dual flow channel structure, it has a guiding effect, which makes the medium flow relatively stable, reduces the probability of unbalanced radial force at the flow channels, and extends the service life. Moreover, the pump body is a split assembly structure, which is conducive to the fine machining of the inner space and the dual flow channels, improves the smoothness, and the frictional resistance between the flow channels and the medium is relatively small, resulting in relatively high efficiency in conveying the medium.

[0060] This overcomes the technical problems of unbalanced radial forces easily generated at the flow channel, relatively poor operational stability, reduced service life, and relatively low efficiency in conveying the medium. It achieves the technical effects of reducing the probability of unbalanced radial forces generated at the flow channel, relatively good operational stability, extended service life, and relatively high efficiency in conveying the medium, and is practical. Attached Figure Description

[0061] Figure 1 This is a sectional view of the final assembly.

[0062] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0063] Figure 3 This is a partial sectional view of the pump body;

[0064] Figure 4 A schematic diagram of the internal space and dual flow channels;

[0065] Figure 5 Exploded view of the split inner volute and split outer shell;

[0066] Figure 6 This is one of the structural schematic diagrams of the first half of the volute.

[0067] Figure 7 This is the second schematic diagram of the first half of the volute.

[0068] Figure 8 This is one of the structural schematic diagrams of the second half of the volute.

[0069] Figure 9 This is the second schematic diagram of the second half of the volute.

[0070] Figure 10 This is a schematic diagram of the first half of the shell;

[0071] Figure 11 for Figure 3 A magnified view of part A in the diagram;

[0072] Figure 12 This is a partial sectional view of the bearing housing;

[0073] Figure 13 This is a partial sectional view of the pump cover;

[0074] Figure 14 This is a partial sectional view of the impeller;

[0075] Figure 15 This is a partial sectional view of the nut;

[0076] In the diagram: 10. Pump body; 11. Split-inner volute; 11-1. Inner space; 11-2. Dual flow channels; 111. First half of the volute; 111-1. First half of the inner space; 111-2. First half of the flow channel; 112. Second half of the volute; 112-1. Second half of the inner space; 112-2. Second half of the flow channel; 111-3. Volute casing; 111-31. First annular groove; 111-4. Annular nozzle; 111-41. Second annular groove. Groove, 111-5. Cylindrical protrusion, 111-51. First through hole, 111-52. Third annular groove, 12. Split outer shell, 121. First half shell, 122. Second half shell, 121-1. Shell body, 121-11. Second through hole, 121-2. Reinforcing rib, 121-3. Split lifting block, 121-31. Third through hole, 121-4. Split support frame, 121-12. Fourth through hole, 123. Lock 13. Tightening bolts, 14. Flange, 15. Sealing element, 16. First split flange, 17. Sealing block, 18. First sealing element, 19. Compression flange, 20. Bearing housing, 21. Housing, 21-1. First stepped through hole, 22. First bearing, 23. Second bearing, 24. Locking nut, 25. First gland, 26. Second sealing element, 27. Second gland, 28. Third sealing element, 29. Main sealing gasket, 210. Middle 220. Support foot, 30. Main shaft, 40. Pump cover, 41. First body, 42. First insert, 43. Fourth seal, 50. Impeller, 51. Second body, 51-1. Second stepped through hole, 52. Second insert, 53. Main blade, 54. Secondary blade, 55. Fifth seal, 60. Locking element, 70. Nut, 71. Third body, 72. Third insert, 73. Sixth seal, 80. Main seal. Detailed Implementation

[0077] To make the content easier to understand, the following detailed description is provided with reference to specific embodiments and accompanying drawings;

[0078] A dual-volute split-jaw fluoroplastic centrifugal pump solves the technical problems in related technologies, such as the easy generation of unbalanced radial forces at the flow channel, relatively poor operational stability, reduced service life, and relatively low efficiency in conveying media. This new pump can be manufactured and used, achieving the positive effects of reducing the probability of unbalanced radial forces at the flow channel, improving operational stability, extending service life, and increasing the efficiency in conveying media. The overall concept is as follows:

[0079] Implementation

[0080] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown; a dual-volute split-jaw fluoroplastic centrifugal pump, comprising:

[0081] Pump body 10;

[0082] The bearing housing 20 is connected at one end to the pump body 10;

[0083] The main shaft 30 is connected to the bearing housing 20, with one end extending into the pump body 10 and spaced apart from the pump body 10, and the other end protruding out of the bearing housing 20.

[0084] A pump cover 40 is disposed between the pump body 10 and the bearing housing 20, surrounding one end of the main shaft 30, and spaced apart from the main shaft 30.

[0085] Impeller 50 is connected to one end of the main shaft 30, and is disposed inside the pump body 10, spaced apart from the pump body 10 and the pump cover 40;

[0086] A locking element 60 is connected to one end of the main shaft 30 and presses the impeller 50.

[0087] Nut 70 is connected to the impeller 50;

[0088] And the main seal 80 is disposed between the bearing housing 20, the main shaft 30, the pump cover 40 and the impeller 50;

[0089] The pump body 10 includes: a split inner volute 11 made of fluoroplastic, having an inner space 11-1 and a double flow channel 11-2, the inner space 11-1 communicating with the double flow channel 11-2, and the impeller 50 being accommodated in the inner space 11-1; a split outer clamping shell 12 for clamping the split inner volute 11; and three flanges 13 connected to the split outer clamping shell 12 to hold the split inner volute 11 in place.

[0090] Specifically, in implementation, the pump body 10 includes: a split inner volute 11, a split outer clamping shell 12, and a flange 13. The pump body 10 is a split assembly structure, which is relatively easy to assemble. Moreover, when damaged or under maintenance, it does not need to be replaced as a whole, which reduces maintenance costs and extends service life.

[0091] The main shaft 30 is rotated by the motor, and the impeller 50, nut 70 and locking part 60 rotate together with the main shaft 30. The medium enters the inner space 11-1 inside the split inner volute 11 and is discharged through the double flow channel 11-2. Due to the adoption of the double flow channel structure, it has the function of guiding the flow, which makes the stability of the medium flow relatively good, reduces the probability of generating unbalanced radial force at the flow channel, and extends the service life. Moreover, the pump body 10 is a split assembly structure, which is conducive to the fine machining of the inner space 11-1 and the double flow channel 11-2, improves the smoothness, and the frictional resistance between the flow channel and the medium is relatively small, resulting in relatively high efficiency of medium conveying.

[0092] Another implementation method:

[0093] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown; in implementation, the split inner volute 11 includes: a first half-volute 111, the first half-volute 111 having a first half-inner space 111-1 and two first half-flow channels 111-2, the first half-inner space 111-1 communicating with the first half-flow channels 111-2; and a second half-volute 112, one side wall of the second half-volute 112 being connected to one side wall of the first half-volute 111, the second half-volute 112 having a second half-inner space 112-1 and two second half-flow channels 112-2, the second half-inner space 112-1 communicating with the second half-flow channels 112-2, the second half-inner space 112-1 and the first half-inner space 111-1 forming the inner space 11-1, the second half-flow channels 112-2 and the first half-flow channels 111-2 forming the dual flow channels 11-2;

[0094] The first half-volute 111 or the second half-volute 112 includes: a volute 111-3 having a first semi-inner space 111-1 and a first semi-flow channel 111-2, or having a second semi-inner space 112-1 and a second semi-flow channel 112-2; and after the two volute 111-3 are connected, a first annular groove 111-31 is provided on the top, and a flange 13 is provided at the first annular groove 111-31; and an annular opening 111-4, located in the middle of the volute 111-3, directly communicating with the first semi-inner space 111-1 or the second semi-inner space 112-1; and a second annular groove 111-41 is provided on the outer circle of the annular opening 111-4, and a flange 13 is provided at the second annular groove 111-41.

[0095] The first half-volute 111 or the second half-volute 112 is made of fluoroplastic, integrally injection molded, and has a roughly "b" shaped structure.

[0096] It is equipped with an inner space 11-1 and a dual flow channel 11-2, such as Figure 4 As shown, in order to clearly indicate the positions of the inner space 11-1 and the dual flow channel 11-2, lines B and C are used as virtual dividing lines. The part between lines B and C, towards the center (the center is the center of the annular pipe opening 111-4), is the inner space 11-1, and the other part is the dual flow channel 11-2.

[0097] The annular port 111-4 is provided. The outer diameter of the annular port 111-4 on the first half-volute 111 is smaller than that of the annular port 111-4 on the second half-volute 112. This facilitates the assembly of the impeller 50, pump cover 40 and bearing housing 20 from the annular port 111-4 on the second half-volute 112, resulting in relatively good structural reliability.

[0098] The first annular groove 111-31 and the second annular groove 111-41 are provided to help to hold the flange 13 in place.

[0099] The separate design of the first half-volute 111 and the second half-volute 112 facilitates the use of CNC machining centers to perform precision machining on the inner space 11-1 and the dual flow channels 11-2, improving the surface finish, for example, to around 1.6 or 2.5. Compared to an integral structure, it is difficult to perform precision machining on the inner space 11-1 and the dual flow channels 11-2 in an integral structure. The surface finish of the flow channels is usually the same as that during injection molding, generally around 6.3 or 12.5. The higher the surface finish, the lower the frictional resistance with the medium, which improves the efficiency of conveying the medium (generally by about 15%). Moreover, the medium flows more smoothly, reducing the probability of unbalanced radial forces at the flow channels, reducing vibration, and extending service life.

[0100] The first semi-volute 111 also has a cylindrical protrusion 111-5, which is disposed on the volute 111-3 and spaced apart from the annular opening 111-4. The cylindrical protrusion 111-5 has a first through hole 111-51, which is directly connected to the dual flow channel 11-2. The outer circumference of the cylindrical protrusion 111-5 has a third annular groove 111-52. The cylindrical protrusion 111-5 is provided to facilitate the connection of the sealing member 14, and there will be no leakage of medium from the first through hole 111-51. Moreover, when cleaning is required, the sealing member 14 can be opened to flush the inside of the pump body 10, which is relatively convenient to use.

[0101] The split outer shell 12 includes: a first half shell 121; a second half shell 122, which together with the first half shell 121 clamps the first half volute 111 and the second half volute 112; and a plurality of locking bolts 123, which connect the first half shell 121 and the second half shell 122.

[0102] The first half-shell 121 or the second half-shell 122 includes: a shell body 121-1, which accommodates the volute shell 111-3, and the shell body 121-1 has a second through hole 121-11 at its middle position, through which the annular tube 111-4 passes; a plurality of reinforcing ribs 121-2, which are spaced apart and connected to the outer wall of the shell body 121-1; two split-lifting blocks 121-3, which are spaced apart and connected to the outer wall of the shell body 121-1, and each lifting block 121-3 has a third through hole 121-31; and two split-support frames 121-4, which are spaced apart and connected to the outer wall of the shell body 121-1, and are spaced apart from the split-lifting blocks 121-3.

[0103] The first half-shell 121 or the second half-shell 122 is made of metal, which not only clamps and positions the first half-shell 111 and the second half-shell 112, but also forms a guarantee to prevent the first half-shell 111 and the second half-shell 112 from being damaged by collision, thus extending the service life.

[0104] The locking bolt 123 is a hexagonal bolt used to lock the first half-shell 121 and the second half-shell 122, and is relatively easy to assemble;

[0105] The shell body 121-1 on the first half shell 121 also has a fourth through hole 121-12, which is penetrated by the cylindrical protrusion 111-5, making assembly relatively convenient;

[0106] Among them, the flange 13 includes: two second half flanges, the partial cross section of the second half flange is an "L" shaped structure, which is stuck in the first annular groove 111-31 and the second annular groove 111-41, and is connected to the first half shell 121 or the second half shell 122 by internal hexagon bolts. The assembly is relatively convenient and it is beneficial to position the half inner volute 11.

[0107] The flange 13 at the annular port 111-4 on the first half-volute 111 is used to connect the liquid inlet pipe (the liquid inlet pipe is a common structure in the prior art) by bolts, and the assembly is relatively convenient.

[0108] The flange 13 at the annular port 111-4 on the second half-volute 112 is used to connect the bearing housing 20 by bolts, which is relatively easy to assemble.

[0109] The flange 13 at the first annular groove 111-31 is used to connect the liquid outlet pipeline (the liquid outlet pipeline is a common structure in the prior art) by bolts, and the assembly is relatively convenient.

[0110] The pump body 10 also has a sealing component 14, which is connected to the split outer shell 12 and the cylindrical protrusion 111-5, and is used to seal the first through hole 111-51.

[0111] The sealing component 14 includes: two first split flanges 141, which are engaged in the third annular grooves 111-52 and connected to the split outer clamp 12; a sealing block 142, which is inserted into the first through hole 111-51 and is made of fluoroplastic; a first sealing element 143, which is disposed between the sealing block 142 and the cylindrical protrusion 111-5; and a clamping flange 144, which is connected to the first split flanges 141 and presses down the sealing block 142.

[0112] The first half-flange 141 is fitted into the third annular groove 111-52 and is connected to the half-outer clamp 12 by bolts, making assembly relatively convenient.

[0113] The sealing block 142 has a "T" shaped structure and is used to block the first through hole 111-51;

[0114] The first sealing element 143 is an O-ring;

[0115] The clamping flange 144 and the first split flange 141 are connected by bolts to clamp the sealing block 142;

[0116] With the sealing component 14 installed, there will be no leakage of medium from the first through hole 111-51. Moreover, when cleaning is required, the sealing component 14 can be opened to flush the inside of the pump body 10. The blockage inside the pump body 10 will flow out from the first through hole 111-51 without disassembling the bearing housing 20, making it relatively convenient to use.

[0117] Another implementation method:

[0118] like Figure 1 , Figure 2 , Figure 12 As shown; in implementation, the bearing housing 20 includes: a housing 21, the housing 21 having a first stepped through hole 21-1 at its middle position; a first bearing 22, connected to one end of the housing 21 and disposed in the first stepped through hole 21-1; two second bearings 23, connected to the other end of the housing 21 and disposed in the first stepped through hole 21-1, spaced apart from the first bearing 22, and connected to the main shaft 30 together with the first bearing 22; two locking nuts 24, connected to the main shaft 30, limiting the second bearings 23; and a first pressure cap 25, connected to the housing 21, pressing down the first bearing 23. Bearing 22; second seal 26, disposed between the first pressure cover 25 and the main shaft 30; second pressure cover 27, connected to the housing 21, pressing down on the second bearing 23; third seal 28, disposed between the second pressure cover 27 and the main shaft 30; main seal gasket 29, connected to the housing 21, surrounding the first pressure cover 25 and spaced apart from the first pressure cover 25; intermediate bracket 210, one end connected to the housing 21, surrounding the main seal gasket 29, the other end pressing down on the pump cover 40 and connected to the flange 13; and support foot 220, connected to the other end of the housing 21.

[0119] The housing 21 is provided with a first stepped through hole 21-1, which is conducive to positioning the first bearing 22 and the second bearing 23, so that the first bearing 22 and the second bearing 23 can reliably support the main shaft 30, and the main shaft 30 can rotate smoothly under the drive of the motor (the motor is a common structure in the prior art, such as a horizontal motor).

[0120] The first bearing 22 is a common structure in the prior art, such as a cylindrical roller bearing, used to support the main shaft 30;

[0121] The second bearing 23 is a common structure in the prior art, such as an angular contact ball bearing, used to support the main shaft 30;

[0122] The locking nut 24 is a common structure in the prior art. It is threaded onto the main shaft 30 and is used to press the inner ring of the second bearing 23.

[0123] After a sealing gasket is placed between the first pressure cap 25 and the housing 21, bolts are inserted to connect them, which is used to position the first bearing 22 and prevent the first bearing 22 from coming off the housing 21.

[0124] The second seal 26 is an oil seal, which can prevent the lubricating oil / grease from leaking from the first bearing 22;

[0125] After a sealing gasket is placed between the second pressure cap 27 and the housing 21, bolts are inserted to connect them, which is used to position the second bearing 23 and prevent the second bearing 23 from coming off the housing 21.

[0126] The third seal 28 is an oil seal, which can prevent the lubricating oil / grease from leaking out of the second bearing 23;

[0127] A bolt is inserted between the main sealing gasket 29 and the housing 21 to position one end of the main sealing element 80, making assembly relatively convenient.

[0128] One end of the intermediate support 210 is connected to the housing 21 by bolts, and the other end is connected to the flange 13 by bolts. It can also press down the pump cover 40, and its structural reliability is relatively good.

[0129] The support feet 220 are connected to the housing 21 by bolts, forming a reliable support structure;

[0130] Spindle 30 is a stepped spindle;

[0131] The bearing housing 20 forms a reliable support structure, which is conducive to the main shaft 30 being rotated by the motor. The impeller 50, nut 70 and locking part 60 rotate together with the main shaft 30. The medium enters the inner space 11-1 in the split inner volute 11 and is discharged through the double flow channel 11-2.

[0132] Another implementation method:

[0133] like Figure 1 , Figure 2 , Figure 13 As shown; in practice, the pump cover 40 includes: a first body 41; a first insert 42 made of fluoroplastic, covering a portion of the first body 41 for contact with the medium; and two fourth seals 43, spaced apart and connected to the first insert 42, forming a seal with the pump body 10.

[0134] The first main body 41 is made of metal, which ensures structural strength and is also conducive to the encapsulation of the first inlay 42.

[0135] The first insert 42 is in direct contact with the medium and is made of fluoroplastic. The first body 41 is not in direct contact with the medium, which prevents the first body 41 from being corroded, improves corrosion resistance, and extends service life.

[0136] The fourth sealing element 43 is an O-ring, which ensures a tight seal;

[0137] The pump cover 40 is provided to form a barrier, preventing the medium from flowing out, and also to facilitate the connection of the main seal 80;

[0138] The process of embedding fluoroplastic inlays into metal bodies is a common technique in the prior art. For example, the metal body is placed in a mold, fluoroplastic particles are injected into the mold, and after being heated in a high-temperature furnace, the fluoroplastic particles melt and cover the metal body. Those skilled in the art can directly and without doubt know how to set it up after seeing the disclosed content, without needing to put in creative effort or conduct excessive experiments.

[0139] Another implementation method:

[0140] like Figure 1 , Figure 2 , Figure 14 As shown; in implementation, the impeller 50 includes: a second body 51, the second body 51 having a second stepped through hole 51-1 at its middle position, the second stepped through hole 51-1 being fitted onto one end of the main shaft 30, and the nut 70 being threadedly connected to the second stepped through hole 51-1; a second insert 52, made of fluoroplastic, covering the outer edge of the second body 51 for contact with the medium; a plurality of main blades 53, made of fluoroplastic, evenly distributed on one side of the second insert 52; a plurality of secondary blades 54, made of fluoroplastic, evenly distributed on the other side of the second insert 52; and two fifth seals 55, spaced apart on the second insert 52, forming a seal with the main seal 80;

[0141] The second main body 51 is made of metal, which ensures structural strength and is also conducive to the encapsulation of the second inlay 52.

[0142] The second insert 52, the main blade 53, and the auxiliary blade 54 are integrally formed and are used to directly contact the medium. The second body 51 does not directly contact the medium, which prevents the second body 51 from being corroded, improves corrosion resistance, and extends service life.

[0143] After the second insert 52, the main blade 53 and the auxiliary blade 54 are inserted into the second body 51, a semi-open impeller 50 is formed, which is beneficial for conveying the medium and reduces the chance of blockage.

[0144] The fifth sealing element 55 is an O-ring, which ensures a tight seal;

[0145] Another implementation method:

[0146] like Figure 1 , Figure 2 As shown; during implementation, the locking component 60 is an internal hex bolt, which is threaded to one end of the main shaft 30 to press the impeller 50, so that the impeller 50 is reliably connected to the main shaft 30;

[0147] Another implementation method:

[0148] like Figure 1 , Figure 2 , Figure 15 As shown; in practice, the nut 70 includes: a third body 71, which is threadedly connected to the impeller 50, covers the locking member 60, and is spaced apart from the locking member 60; a third insert 72, which is made of fluoroplastic and covers the outer wall of the third body 71; and a sixth sealing member 73, which is disposed on the third insert 72 and forms a seal with the impeller 50.

[0149] The third body 71 is made of metal, which ensures structural strength. One end of the third body 71 is threaded to the impeller 50, covering the locking part 60 to prevent the medium from entering and corroding the locking part 60 and the main shaft 30.

[0150] The third insert 72 is in direct contact with the medium, which improves corrosion resistance and extends service life;

[0151] The sixth sealing element 73 is an O-ring, which ensures a tight seal;

[0152] Another implementation method:

[0153] like Figure 1 , Figure 2As shown; in implementation, the main seal 80 is a commonly used structure in the prior art, such as a mechanical seal, which ensures sealing performance and prevents media leakage; those skilled in the art, after seeing the disclosed content, can directly and without doubt know how to set the main seal 80, without needing to put in creative effort or conduct excessive experiments;

[0154] Another implementation method:

[0155] like Figure 1 , Figure 2 , Figure 10 As shown; during implementation, the motor is connected to the base plate (the base plate is a common structure in the prior art, which is welded from channel steel, plates and other materials, and has a rectangular shape). The motor is connected to the main shaft 30 through a coupling. The support feet 220 on the bearing box 20 are connected to the base plate through bolts. The split support frame 121-4 on the pump body 10 is connected to the base plate through bolts. After the double volute split-clamp fluoroplastic centrifugal pump is connected to the base plate, the structural reliability is relatively good and the operation stability is good.

[0156] The base plate, motor, and coupling are common structures in the prior art and are not the inventive points of this utility model. They are only used to better describe this utility model and facilitate understanding of the technical solution of this utility model. Those skilled in the art can directly and without doubt know how to set them up after seeing the disclosed content, without needing to put in creative effort or conduct excessive experiments.

[0157] In the description, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings, and are only for the convenience or simplification of the description, rather than indicating a specific orientation that must be present; the operation process described in the embodiments is not an absolute usage step, and corresponding adjustments can be made in actual use;

[0158] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art; the words “first,” “second,” and similar terms used in the specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components, and similarly, the words “a” or “a” and similar terms do not determine a quantity limitation, but rather indicate the presence of at least one, as determined by the content of the embodiments;

[0159] The above description is only a preferred embodiment, but the scope of protection is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the disclosed technology, based on the technical solution and inventive concept, should be included within the scope of protection.

Claims

1. A split case, half-impeller, centrifugal pump of fluoroplastic construction, characterized in that, include: Pump body; The bearing housing is connected to the pump body at one end; The main shaft is connected to the bearing housing, with one end extending into the pump body and spaced apart from the pump body, and the other end protruding out of the bearing housing. A pump cover is disposed between the pump body and the bearing housing, surrounding one end of the main shaft and spaced apart from the main shaft; An impeller is connected to one end of the main shaft, disposed within the pump body, and spaced apart from the pump body and the pump cover. A locking element, connected to one end of the main shaft, presses the impeller; Nuts are attached to the impeller; And the main seal is disposed between the bearing housing, the main shaft, the pump cover and the impeller; The pump body includes: a split inner volute, the split inner volute being made of fluoroplastic and having an inner space and dual flow channels, the inner space communicating with the dual flow channels and accommodating the impeller; a split outer clamping shell for clamping the split inner volute; and three flanges connected to the split outer clamping shell to hold the split inner volute in place.

2. A split case half-impeller centrifugal pump according to claim 1, characterized in that: The split inner volute includes: a first half volute, the first half volute having a first half inner space and two first half flow channels, the first half inner space communicating with the first half flow channels; And a second half-volute, one side wall of the second half-volute is connected to one side wall of the first half-volute, the second half-volute has a second half-inner space and two second half-flow channels, the second half-inner space is connected to the second half-flow channels, the second half-inner space and the first half-inner space form the inner space, and the second half-flow channels and the first half-flow channels form the dual flow channels.

3. A split case half-impeller centrifugal pump according to claim 2, characterized in that: The first half-volute or the second half-volute includes: a volute housing having a first half-inner space and a first half-flow channel, or having a second half-inner space and a second half-flow channel, and after the two volute housings are connected, a first annular groove is provided on the top, and a flange is provided at the first annular groove; And an annular opening is provided in the middle of the volute housing, directly communicating with the first half of the inner space or the second half of the inner space, and the outer circle of the annular opening has a second annular groove, and a flange is provided at the second annular groove.

4. The double-volute split-jaw fluoroplastic centrifugal pump according to claim 3, characterized in that: The first half of the volute also has a cylindrical protrusion, which is disposed on the volute and spaced apart from the annular opening; The cylindrical protrusion has a first through hole, which is directly connected to the dual flow channels; The outer circumference of the cylindrical protrusion has a third annular groove.

5. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 4, characterized in that: The split outer shell includes: a first half shell; a second half shell, which, together with the first half shell, clamps the first half shell and the second half shell; and a plurality of locking bolts, connecting the first half shell and the second half shell; The first half-shell or the second half-shell includes: a shell body that accommodates the volute shell, and a second through hole at the middle position of the shell body, the second through hole being penetrated by the annular tube opening; Several reinforcing ribs are connected at intervals to the outer wall of the shell body; Two split lifting blocks are connected at intervals to the outer wall of the shell body, and each lifting block has a third through hole; And two split support frames, which are connected at intervals to the outer wall of the shell body and are spaced apart from the split lifting blocks; The shell body on the first half-shell also has a fourth through hole, which is penetrated by the cylindrical protrusion.

6. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 4, characterized in that: The pump body also has a sealing component connected to the split outer shell and the cylindrical protrusion, used to seal the first through hole; The sealing component includes: two first split flanges, which are engaged in the third annular groove and connected to the split outer shell; A sealing block is inserted into the first through hole, and the sealing block is made of fluoroplastic. A first sealing element is disposed between the sealing block and the cylindrical protrusion; And a clamping flange, connected to the first split flange, to press down the sealing block.

7. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 1, characterized in that: The bearing housing includes: a housing body, wherein the housing body has a first stepped through hole at the middle position; The first bearing is connected to one end of the housing and is disposed in the first stepped through hole; Two second bearings are connected to the other end of the housing, are disposed in the first stepped through hole, are spaced apart from the first bearing, and are connected to the main shaft together with the first bearing; Two locking nuts are connected to the main shaft to limit the second bearing; The first pressure cap is connected to the housing and presses down the first bearing; A second seal is disposed between the first gland and the main shaft; The second pressure cap is connected to the housing and presses down the second bearing; A third sealing element is disposed between the second gland and the main shaft; The main sealing gasket is connected to the housing, surrounds the first pressure cover, and is spaced apart from the first pressure cover. The intermediate support is connected to the housing at one end and surrounds the main sealing gasket at the other end, pressing against the pump cover and connecting to the flange. And a support leg, which is connected to the other end of the housing.

8. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 1, characterized in that: The pump cover includes: a first body; The first inlay, made of fluoroplastic, covers a portion of the first body and is used to contact the medium; And two fourth seals, spaced apart and connected to the first insert, forming a seal with the pump body.

9. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 1, characterized in that: The impeller includes: a second body, the second body having a second stepped through hole at the middle position, the second stepped through hole being fitted onto one end of the main shaft, and the nut being threadedly connected to the second stepped through hole; The second insert, made of fluoroplastic, covers the outer edge of the second body and is used to contact the medium; Several main blades, made of fluoroplastic, are evenly distributed on one side of the second inlay; Several secondary blades, made of fluoroplastic, are evenly distributed on the other side of the second inlay; And two fifth seals, spaced apart on the second insert, forming a seal with the main seal.

10. A double-volute split-jaw fluoroplastic centrifugal pump according to claim 1 or 9, characterized in that: The nut includes: a third body, which is threadedly connected to the impeller, covers the locking member, and is spaced apart from the locking member; The third inlay, made of fluoroplastic, covers the outer wall of the third main body; And a sixth seal is disposed on the third insert to form a seal with the impeller.

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