A multi-condition adaptable fluoropolymer axial flow pump

Abstract

This invention relates to the field of axial flow pump technology, and discloses a multi-condition adaptable fluoropolymer axial flow pump, comprising a guide vane body and a trumpet tube fixed to each other. An upper fluoropolymer sleeve is provided on the inner wall of the guide vane body, and a lower fluoropolymer sleeve is provided on the inner wall of the trumpet tube. A fluoropolymer jacket is sandwiched at the joint between the guide vane body and the trumpet tube, and both the upper and lower fluoropolymer sleeves are sealed to the fluoropolymer jacket. A movable sealing assembly is provided on the portion of the main shaft located between the bushing and the impeller to limit the impeller and seal the gap between the main shaft and the bushing and impeller. By adopting a split fluoropolymer shell structure with an upper fluoropolymer sleeve, a lower fluoropolymer sleeve, and a fluoropolymer jacket, it can adapt to various corrosive media such as strong acids, strong alkalis, and organic solvents, meeting the multi-condition requirements of industries such as chemical, metallurgical, and environmental protection. The movable sealing assembly forms a mechanical locking fixation, with high connection strength, effectively preventing gap formation caused by high-speed media erosion.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, specifically to a multi-condition adaptable fluoropolymer axial flow pump. Background Technology

[0002] Axial flow pumps, as core equipment for high-flow, low-head fluid transportation, are widely used in chemical, metallurgical, and environmental protection fields. Especially in scenarios involving highly corrosive media (such as strong acids, strong alkalis, and organic solvents), their corrosion resistance, adaptability, and operational stability directly determine production continuity. Production conditions in industries such as chemicals and pharmaceuticals often change with process adjustments. Different media (such as concentrated sulfuric acid, hydrochloric acid, and strong alkaline solutions) exhibit significant differences in corrosivity, temperature, and solids content, requiring the flow-through components of axial flow pumps to possess specific corrosion resistance. Traditional fluoropolymer-lined axial flow pumps often have integrally molded flow-through components made of fixed materials (such as single PTFE or PVDF). When operating conditions change, the entire pump body or core components need to be replaced, resulting in long replacement cycles, high equipment purchase costs, and severely impacting production efficiency. Furthermore, some traditional pump bodies use a steel-lined fluoropolymer integrated structure, with the fluoropolymer lining tightly bonded to the metal substrate. Once the fluoropolymer lining wears or corrodes and fails, the entire pump body must be scrapped, further increasing maintenance costs.

[0003] Furthermore, the guide shell of axial flow pumps is mostly composed of guide vanes and bell tubes. In traditional designs, simple flange seals or single gasket seals are often used at the joints, which presents two major problems: First, the sealing surfaces are in planar contact, and the medium is prone to stagnation in the gaps when it flows through. Long-term stagnation of highly corrosive media will lead to corrosion of the sealing surface and aging and failure of the gasket, which will in turn cause media leakage. This not only pollutes the environment but also corrodes the metal base of the pump body and shortens the service life of the equipment. Second, the high-speed flowing medium will continuously scour the sealing surface. The connection strength of traditional sealing structures is insufficient, and the sealing surfaces are prone to separation and gaps, which will allow corrosive media to seep into the pump body and damage key components such as the shaft system.

[0004] Meanwhile, during the operation of an axial flow pump, the impeller is prone to axial upward movement due to the thrust of the medium during high-speed rotation. Traditional axial flow pumps mostly use fixed sealing structures (such as a single mechanical seal), which cannot compensate for the axial displacement of the impeller. On the one hand, impeller movement can lead to poor sealing surface contact and gaps, allowing highly corrosive media to seep into the shaft system along the gaps, corroding the main shaft, bearings, and other metal components, causing seal failure. On the other hand, direct contact between the impeller and the shaft sleeve can cause wear, exacerbating seal damage and increasing the rate of unplanned equipment downtime. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-condition adaptable fluoropolymer axial flow pump, which solves the problems of easy wear or corrosion failure of the fluoropolymer lining in existing axial flow pumps, as well as the corrosion of metal components such as the main shaft and bearings caused by gaps due to impeller axial displacement.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-condition adaptable fluoropolymer axial flow pump, comprising a guide vane body and a horn tube fixed to each other, wherein the horn tube has an inlet at its bottom, the guide vane body has a circumferential opening at its top, a bushing is fixed inside the guide vane body, a main shaft is rotatably connected inside the bushing, an impeller is provided at the bottom of the main shaft extending out of the bushing, and a motor for driving the main shaft to rotate is provided at the top of the bushing; an upper fluoropolymer sleeve is provided on the inner wall of the guide vane body, a lower fluoropolymer sleeve is provided on the inner wall of the horn tube, a fluoropolymer jacket is clamped at the joint between the guide vane body and the horn tube, and both the upper and lower fluoropolymer sleeves are sealed to the fluoropolymer jacket;

[0007] The portion of the main shaft located between the bushing and the impeller is equipped with a movable sealing kit, which is used to limit the impeller and seal the gap between the main shaft and the bushing and impeller.

[0008] Preferably, the bottom surface of the upper fluoropolymer sleeve is recessed inward to form a first locking groove, and a first extended locking protrusion is formed between the bottom of the first locking groove and the inner wall surface of the upper fluoropolymer sleeve; the top surface of the fluoropolymer jacket has an upper locking protrusion protruding upward, the upper locking protrusion engaging with the first locking groove, and an upper locking groove being formed between the upper locking protrusion and the inner wall surface of the fluoropolymer jacket, with the first extended locking protrusion engaging in the upper locking groove.

[0009] Preferably, an upwardly inclined first sealing surface is formed between the first extended protrusion and the inner wall of the upper fluoropolymer sleeve, and the upper groove extends toward the inner wall of the fluoropolymer sleeve to form an upwardly protruding first sealing edge ring, which is engaged with the first sealing surface.

[0010] Preferably, the top surface of the lower fluoropolymer sleeve is recessed inward to form a lower locking groove, and the outer side of the lower locking groove is formed with a lower locking protrusion; the bottom surface of the fluoropolymer jacket is recessed downward to form a second locking groove, the lower locking protrusion can be engaged in the second locking groove, and a second extended locking protrusion is formed between the second locking groove and the inner wall surface of the fluoropolymer jacket, the second extended locking protrusion can be engaged in the lower locking groove.

[0011] Preferably, the lower groove extends towards the top of the inner wall of the fluoropolymer sleeve to form an upwardly protruding second sealing edge ring, and the second extended protrusion extends upward along the inner wall of the fluoropolymer sleeve to form a second sealing surface, and the second sealing edge ring is fastened to the second sealing surface.

[0012] Preferably, the bottom of the bushing has a retaining ring;

[0013] The movable sealing assembly includes an upper sealing ring and a lower sealing ring that abut against each other. The bottom of the lower sealing ring is provided with a positioning ring that is rotatably connected to the impeller. The inner sides of the upper sealing ring and the lower sealing ring are connected by an elastic element. The top of the upper sealing ring extends upward and is integrally formed with an extension sleeve, which abuts against the retaining ring.

[0014] Preferably, the bottom surface of the upper sealing ring is stepped, forming an outer stepped portion at the outer edge and an inner stepped portion at the inner edge; the top surface of the lower sealing ring is stepped, forming an inner annular sealing surface at the inner edge and an outer annular sealing surface at the outer edge; wherein, when the upper sealing ring and the lower sealing ring are mated, the inner annular sealing surface can abut against the inner stepped portion, and the outer annular sealing surface can abut against the outer stepped portion.

[0015] Preferably, a sealing ring is provided on the contact surface between the inner stepped portion and the inner annular sealing surface.

[0016] Preferably, the lower fluorinated material sleeve has inner blades arranged in a circumferential spiral on its inner wall, and the upper fluorinated material sleeve has guide grooves arranged in a circumferential spiral on its inner wall.

[0017] Preferably, the inner blade includes a leaf root fixed to the inner wall of the lower fluorine material sleeve and a leaf edge located at the outer end of the leaf root. The leaf edge is twisted in the direction from the leaf root to form a twisted surface on the outer wall. The bottom and top of the inner blade are respectively formed with a leaf base edge and a leaf top edge. The inner blade gradually widens from the leaf base edge to the leaf top edge and forms a wide edge at the leaf edge.

[0018] The beneficial effects of the present invention are as follows: By using the multi-condition adaptable fluoropolymer axial flow pump provided by the present invention, the following technical effects are achieved:

[0019] 1. By adopting a split fluorinated shell structure consisting of an upper fluorinated shell, a lower fluorinated shell, and a fluorinated jacket, and with the fluorinated material selectable from PFA, PTFE, or PVDF according to operating conditions, the system achieves an "on-demand replacement" adaptability function. When the conveyed medium, temperature, or solid content changes, there is no need to replace the entire pump body; only the detachable end cover flange at the bottom of the bell pipe needs to be removed to replace the corresponding fluorinated shell or jacket individually, improving replacement efficiency. It can also adapt to various media such as strong acids, strong alkalis, organic solvents, and hydrogen, meeting the multi-condition requirements of industries and scenarios such as chemical, metallurgical, environmental protection, and fuel cell hydrogen circulation systems, significantly improving the equipment's versatility and applicability.

[0020] 2. The first extended locking protrusion of the upper fluoropolymer sleeve engages with the upper locking groove of the fluoropolymer jacket, and the lower locking protrusion of the lower fluoropolymer sleeve engages with the second locking groove of the fluoropolymer jacket, forming a mechanical locking and fixing mechanism with high connection strength, effectively preventing gaps caused by high-speed media erosion. At the same time, the line contact sealing design of the first sealing ring and the first sealing surface, and the second sealing ring and the second sealing surface, achieves a tight fit under the assembly clamping force, significantly improving sealing reliability. In addition, the sealing surface adopts an upward inclined slope design, which guides the medium to rise naturally when it flows through, avoiding the retention and corrosion of the medium in the gaps, fundamentally solving the problems of easy leakage and corrosion of traditional sealing structures.

[0021] 3. The upper and lower sealing rings are connected by an elastic element, achieving the dual functions of axial limiting and dynamic sealing: When the impeller rotates and floats at high speed, it drives the lower sealing ring to move upward synchronously. The elastic element is compressed and stores energy, generating a reverse constraint force, which forces the impeller to return to its initial axial position, effectively suppressing axial movement. At the same time, the stepped structure of the lower and upper sealing rings forms an inner and outer double-ring line contact seal. Together with the sealing ring of the inner stepped part, it constructs three sealing barriers. Even if there is a slight axial movement of the impeller, it can still maintain the continuous contact of the sealing surface, completely preventing corrosive media from penetrating into the shaft system.

[0022] 4. By optimizing the spiral flow guiding structure on the inner wall of the fluoropolymer sleeve: the inner blades of the lower fluoropolymer sleeve adopt a twisted surface and wide edge design. When the medium flows through, it smoothly transitions along the twisted surface, and the wide edge reduces the velocity gradient, so that the medium forms a stable pre-swirling flow field at the impeller inlet, which greatly reduces the inlet impact loss; the guide groove of the upper fluoropolymer sleeve is set in a positive spiral, and the spiral lift angle of the guide blades is greater than that of the inner blades, which helps the medium to flow continuously spirally along the guide groove, reducing output resistance, suppressing radial turbulence, achieving effective noise reduction and reducing noise pollution. Attached Figure Description

[0023] Figure 1 This is the front view of the present invention;

[0024] Figure 2 For the present invention Figure 1 Sectional view along line AA;

[0025] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point a;

[0026] Figure 4 This is a schematic diagram of the guide vane structure of the present invention;

[0027] Figure 5 This is an isometric view of the internal blades of the present invention;

[0028] Figure 6 For the present invention Figure 2 Enlarged structural diagram at point b;

[0029] Figure 7 This is a three-dimensional structural diagram of the movable sealing kit of the present invention;

[0030] Figure 8 This is an isometric view of the present invention.

[0031] Explanation of reference numerals in the figure: 1. Motor; 2. Guide vane body; 3. Trumpet tube; 4. Inlet; 5. Bushing; 6. Main shaft; 7. Upper fluorine sleeve; 8. Lower fluorine sleeve; 9. Impeller; 10. Inner blade; 101. Blade root; 102. Blade edge; 103. Blade base edge; 104. Blade tip edge; 105. Twisted surface; 106. Wide edge; 11. First sealing surface; 12. First groove; 13. First extended protrusion; 14. Fluorine jacket; 15. Upper protrusion; 16. 17. Upper groove; 18. First sealing edge ring; 19. Second sealing surface; 20. Second groove; 21. Second extended protrusion; 22. Second sealing edge ring; 23. Lower protrusion; 24. Lower groove; 25. Guide groove; 26. Snap ring; 27. Upper sealing sleeve; 28. Extended sleeve; 29. ​​Inner stepped portion; 30. Outer stepped portion; 31. Elastic element; 32. Lower sealing sleeve; 33. Inner annular sealing surface; 34. Outer annular sealing surface; 35. Positioning ring; 36. Sealing ring. Detailed Implementation

[0032] To better explain and facilitate understanding of the present invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The present invention discloses an axial flow pump, particularly a multi-condition adaptable fluoropolymer axial flow pump, comprising a guide vane body and a horn tube fixed to each other. An upper fluoropolymer sleeve is provided on the inner wall of the guide vane body, and a lower fluoropolymer sleeve is provided on the inner wall of the horn tube. A fluoropolymer jacket is clamped at the joint between the guide vane body and the horn tube. Both the upper and lower fluoropolymer sleeves are sealed and connected to the fluoropolymer jacket, forming the inner fluoropolymer shell of the guide shell. A movable sealing kit is provided on the portion of the main shaft located between the bushing and the impeller. When the main shaft drives the impeller to rotate at high speed, the movable sealing kit is used to limit the impeller and seal the main shaft and bushing, preventing the impeller from floating upwards and contacting the bushing during high-speed rotation, thus avoiding seal failure caused by axial movement. Inner blades are arranged in a circumferential spiral on the inner wall of the lower fluoropolymer sleeve, and guide grooves are arranged in a circumferential spiral on the inner wall of the upper fluoropolymer sleeve. The channel is designed for forward rotation, assisting the medium output by the impeller to continue its spiral flow along the guide channel, reducing resistance during medium output. The guide vanes and inner vanes rotate in the same direction, causing the medium to rise in a vortex shape and contact the impeller during axial transport, thereby significantly improving the fluid kinetic energy conversion efficiency. At the same time, the spiral guide structure can effectively suppress radial turbulence of the medium, reduce impeller rotational resistance, increase the medium delivery rate of the axial flow pump, and increase the head of the axial flow pump. When the medium passes through the inner vanes, it smoothly transitions along the twisted surface, and the wide side reduces the velocity gradient, so that the velocity is increased in a spiral shape before contacting the impeller, so that the medium forms a stable pre-swirl at the impeller inlet, greatly reducing inlet impact loss. The twisted surface and the wide side work together to enhance the impeller's fluid delivery capacity, thereby improving overall hydraulic efficiency and reducing operating noise.

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments; various changes can be made to the implementation scheme as long as the effects of the present invention can be achieved.

[0034] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0035] like Figures 1-8As shown, this embodiment discloses a multi-condition adaptable fluoropolymer axial flow pump, including a guide vane body 2 and a horn tube 3 fixed to each other, the guide vane body 2 and the horn tube 3 forming the flow guide shell of the axial flow pump; an inlet 4 for medium to flow in is opened at the bottom of the horn tube 3, and the top of the guide vane body 2 is circumferentially open for medium to flow out; a bushing 5 is fixed inside the guide vane body 2 by a bracket, and the bushing 5, the bracket and the guide vane body 2 are integrally formed; a main shaft 6 is rotatably connected inside the bushing 5, and an impeller 9 is provided at the bottom of the main shaft 6 extending out of the bushing 5. The impeller 9 is located inside the flow guide shell formed by the guide vane body 2 and the horn tube 3, and a motor 1 for driving the main shaft 6 to rotate is provided at the top of the bushing 5.

[0036] In this embodiment, as Figure 2 As shown, an upper fluorinated material sleeve 7 is provided on the inner wall of the guide vane body 2. The upper fluorinated material sleeve 7 is adapted to the shape of the guide vane body 2 and can be embedded inside the guide vane body 2. A lower fluorinated material sleeve 8 is provided on the inner wall of the horn tube 3. The lower fluorinated material sleeve 8 is adapted to the shape of the horn tube 3 and can be embedded inside the horn tube 3. The bottom of the lower fluorinated material sleeve 8 has a circumferential groove to fit with the inlet 4. It should be noted that the bottom of the horn tube 3 is a detachable end cap flange. After disassembly, the inner cavity of the horn tube 3 can be completely exposed to facilitate the replacement of the lower fluorinated material sleeve 8. In addition, fluorinated material is sandwiched at the joint between the guide vane body 2 and the horn tube 3. After actual installation, the upper fluoropolymer sleeve 7 and the lower fluoropolymer sleeve 8 are both sealed and connected to the fluoropolymer jacket 14. The upper fluoropolymer sleeve 7, the lower fluoropolymer sleeve 8, and the fluoropolymer jacket 14 constitute the internal fluoropolymer shell of the flow guide shell. The material is PFA, PTFE, or PVDF, etc., which is in direct contact with the flowing medium. The fluoropolymer shell can be replaced according to the usage requirements and the medium being transported to achieve multi-condition operation and improve the adaptability of the axial flow pump. The fluoropolymer shell is not only resistant to strong acid, strong alkali and organic solvent corrosion, but also maintains structural stability and low surface energy characteristics in a wide temperature range of -200℃ to 260℃.

[0037] Specifically, such as Figure 3 As shown, in this embodiment, a first groove 12 is recessed inward on the bottom surface of the upper fluoropolymer sleeve 7, and a first extended protrusion 13 is formed between the bottom of the first groove 12 and the inner wall surface of the upper fluoropolymer sleeve 7; in addition, an upper protrusion 15 protrudes upward on the top surface of the fluoropolymer jacket 14, and an upper groove 16 is formed between the upper protrusion 15 and the inner wall surface of the fluoropolymer jacket 14; during assembly, the fluoropolymer jacket 14 is held in the middle position by the guide vane body 2 and the horn tube 3. When the upper fluoropolymer sleeve 7 is installed, the upper protrusion 15 can engage with the first groove 12, and the first extended protrusion 13 can engage in the upper groove 16, so that the upper fluoropolymer sleeve 7 can engage and fasten with the fluoropolymer jacket 14, so that the two are tightly connected into one, improving the connection strength between the two, and preventing the upper fluoropolymer sleeve 7 from being affected by the high-speed flowing medium during the conveying of the medium, resulting in a gap between the fluoropolymer jacket 14 and the medium, which would cause the guide shell to be corroded.

[0038] Furthermore, an upwardly inclined first sealing surface 11 is formed between the first extended protrusion 13 and the inner wall surface of the upper fluoropolymer sleeve 7, and the upper groove 16 extends towards the inner wall surface of the fluoropolymer jacket 14 to form an upwardly protruding first sealing edge ring 17, which is fastened to the first sealing surface 11. This design creates an upward slope at the gap between the upper fluoropolymer sleeve 7 and the fluoropolymer jacket 14, guiding the medium as it flows through this area to rise naturally and preventing stagnation and corrosion. At the same time, the first sealing edge ring 17 and the first sealing surface 11 achieve line contact sealing under the assembly clamping force, significantly improving the pressure resistance and erosion resistance.

[0039] Specifically, such as Figure 3 As shown, in this embodiment, a lower retaining groove 23 is formed inwardly on the top surface of the lower fluoropolymer sleeve 8, and a lower retaining protrusion 22 is formed on the outer side of the lower retaining groove 23; a second retaining groove 19 is formed inwardly on the bottom surface of the fluoropolymer jacket 14, and a second extended retaining protrusion 20 is formed between the second retaining groove 19 and the inner wall surface of the fluoropolymer jacket 14; when the lower fluoropolymer sleeve 8 is installed, the lower retaining protrusion 22 can engage in the second retaining groove 19, and the second extended retaining protrusion 20 can engage in the lower retaining groove 23, so that the lower fluoropolymer sleeve 8 can engage and fasten with the fluoropolymer jacket 14, so that the two are tightly connected into one, thereby improving the connection strength between the two.

[0040] Furthermore, the lower groove 23 extends towards the top of the inner wall of the fluoropolymer sleeve 8 to form an upwardly protruding second sealing edge ring 21, and the second extended protrusion 20 extends upward along the inner wall of the fluoropolymer jacket 14 to form a second sealing surface 18. The second sealing edge ring 21 is fastened to the second sealing surface 18. This design creates an upward slope at the joint between the lower fluoropolymer sleeve 8 and the fluoropolymer jacket 14. When the medium flows through this area, it is guided by the slope and naturally rises, avoiding stagnation and corrosion. At the same time, the first sealing edge ring 17 and the first sealing surface 11 achieve line contact sealing under the assembly clamping force, significantly improving the pressure resistance and erosion resistance.

[0041] In this embodiment, as Figure 2 As shown, the bottom of the bushing 5 is secured with a retaining ring 25; the main shaft 6 located between the bushing 5 and the impeller 9 is equipped with a movable sealing kit. When the main shaft 6 drives the impeller 9 to rotate at high speed, the movable sealing kit is used to limit the impeller 9 and seal the main shaft and bushing 5, preventing the impeller 9 from floating upwards and contacting the bushing 5 when rotating at high speed, thus avoiding seal failure caused by axial movement; it can also seal the gap between the bushing 5 and the impeller 9 and the main shaft 6, preventing the medium from seeping into the shaft system; the movable sealing sleeve is made of fluororubber, which has both elastic deformation capability and corrosion resistance, and automatically compensates for the sealing gap when the main shaft 6 reciprocates slightly, ensuring zero leakage under long-term operation.

[0042] Specifically, such as Figure 6 and Figure 7As shown, in this embodiment, the movable sealing kit includes an upper sealing ring 26 and a lower sealing ring 31 that abut against each other. The bottom of the lower sealing ring 31 is provided with a positioning ring 34 that is rotatably connected to the impeller 9. The inner sides of the upper sealing ring 26 and the lower sealing ring 31 are connected by an elastic element 30. The top of the upper sealing ring 26 extends upward and is integrally formed with an extension sleeve 27, which abuts against the retaining ring 25. When the impeller 9 rotates at high speed and floats upward, it drives the lower sealing ring 31 to move upward synchronously. The elastic element 30 is compressed and stores energy, generating a reverse constraint force on the upward floating trend of the impeller 9, forcing the impeller 9 to return to its initial axial position. In addition, when the impeller 9 drives the lower sealing ring 31 to float upward, it also abuts against the upper sealing ring 26, so that the two are tightly fitted together, forming a double dynamic sealing barrier, which further enhances the dual reliability of axial movement suppression and media isolation.

[0043] Furthermore, the bottom surface of the upper sealing ring 26 is stepped, forming an outer stepped portion 29 at the outer edge and an inner stepped portion 28 at the inner edge. The top surface of the lower sealing ring 31 is stepped, forming an inner annular sealing surface 32 at the inner edge and an outer annular sealing surface 33 at the outer edge. When the upper sealing ring 26 and the lower sealing ring 31 are mated, the inner annular sealing surface 32 can abut against the inner stepped portion 28, and the outer annular sealing surface 33 can abut against the outer stepped portion 29, forming an inner and outer double annular line contact sealing structure, which greatly improves the radial sealing stability. The precise fit between the two stepped portions and the corresponding sealing surfaces can maintain continuous contact even when the impeller moves slightly in the axial direction, effectively inhibiting the upward penetration of the medium along the main shaft gap.

[0044] Furthermore, a sealing ring 35 is provided on the contact surface between the inner stepped portion 28 and the inner annular sealing surface 32 to enhance the tightness of the contact surface between the inner stepped portion 28 and the inner annular sealing surface 32, thereby further enhancing the sealing performance.

[0045] Specifically, such as Figure 2 and Figure 4 As shown, in this embodiment, inner blades 10 are arranged in a spiral pattern on the inner wall of the lower fluoropolymer sleeve 8, and guide grooves 24 are arranged in a spiral pattern on the inner wall of the upper fluoropolymer sleeve 7. The guide grooves 24 are arranged in a forward spiral pattern to assist the medium output by the impeller 9 to continue spiral flow along the guide grooves 24, reducing the resistance when the medium is output. The inner blades 10 rotate in the same direction as the impeller 9, so that the medium rises in a vortex shape to contact the impeller 9 during axial transportation, thereby significantly improving the fluid kinetic energy conversion efficiency. At the same time, the spiral guide structure can effectively suppress the radial turbulence of the medium, reduce the rotational resistance of the impeller 9, increase the conveying rate of the axial flow pump to the medium, and increase the head of the axial flow pump.

[0046] Please refer to Figure 5The inner blade 10 includes a blade root 101 fixed to the inner wall of the lower fluoropolymer sleeve 8 and a blade edge 102 located at the outer end of the blade root 101. The blade edge 102 is twisted in the direction from the blade root 101 to form a twisted surface 105 on the outer wall. The bottom and top of the inner blade 10 are respectively formed with a bottom edge 103 and a top edge 104. The inner blade 10 gradually widens from the bottom edge 103 to the top edge 104 and forms a wide edge 106 at the blade edge 102. The blade is twisted and has a wide edge 106. The inner blade 10 design allows the medium to smoothly transition along the twisted surface 105 when passing through the inner blade 10. The wide side 106 reduces the velocity gradient, causing the velocity to be increased in a spiral shape before contacting the impeller 9. This creates a stable pre-swirling flow field at the inlet of the impeller 9, significantly reducing inlet impact losses. The twisted surface 105 and the wide side 106 work together to release the kinetic energy of the medium along the axial gradient, enhancing the impeller 9's ability to transport fluid, thereby improving overall hydraulic efficiency and reducing operating noise.

[0047] The basic principles, main features, and advantages of the present invention have been described above. However, the above description is only a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

[0048] In the description of this invention, each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. As the apparatus disclosed in the embodiments corresponds to the methods disclosed in the embodiments, the description is relatively simple, and relevant parts can be referred to the method section.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-condition adaptable fluoropolymer axial flow pump, characterized in that: The device includes a guide vane body (2) and a horn tube (3) that are fixed to each other. The horn tube (3) has an inlet (4) at the bottom. The guide vane body (2) has an opening in the circumferential direction at the top. A bushing (5) is fixed inside the guide vane body (2). A main shaft (6) is rotatably connected inside the bushing (5). An impeller (9) is provided at the bottom of the main shaft (6) extending out of the bushing (5). A motor (1) is provided at the top of the bushing (5) to drive the main shaft (6) to rotate. An upper fluorine material sleeve (7) is provided on the inner wall of the guide vane body (2). A lower fluorine material sleeve (8) is provided on the inner wall of the horn tube (3). A fluorine material jacket (14) is clamped at the joint of the guide vane body (2) and the horn tube (3). The upper fluorine material sleeve (7) and the lower fluorine material sleeve (8) are both sealed and connected to the fluorine material jacket (14). The portion of the main shaft (6) located between the bushing (5) and the impeller (9) is provided with a movable sealing kit for limiting the impeller (9) and sealing the gap between the main shaft and the bushing (5) and the impeller (9); The bottom surface of the upper fluorine material sleeve (7) is recessed inward to form a first groove (12), and a first extended protrusion (13) is formed between the bottom of the first groove (12) and the inner wall surface of the upper fluorine material sleeve (7); the top surface of the fluorine material jacket (14) protrudes upward to form an upper protrusion (15), the upper protrusion (15) engages with the first groove (12), and an upper groove (16) is formed between the upper protrusion (15) and the inner wall surface of the fluorine material jacket (14), and the first extended protrusion (13) engages in the upper groove (16); An upwardly inclined first sealing surface (11) is formed between the first extended protrusion (13) and the inner wall surface of the upper fluoromaterial sleeve (7). The upper groove (16) extends towards the inner wall surface of the fluoromaterial jacket (14) to form an upwardly protruding first sealing edge ring (17). The first sealing edge ring (17) is fastened to the first sealing surface (11). The bottom of the bushing (5) is secured by a retaining ring (25); The movable sealing kit includes an upper sealing ring (26) and a lower sealing ring (31) that abut against each other. The bottom of the lower sealing ring (31) is provided with a positioning ring (34) that is rotatably connected to the impeller (9). The inner sides of the upper sealing ring (26) and the lower sealing ring (31) are connected by an elastic element (30). The top of the upper sealing ring (26) extends upward and is integrally formed with an extension sleeve (27). The extension sleeve (27) abuts against the retaining ring (25). The bottom surface of the upper sealing ring (26) is stepped, with an outer stepped portion (29) at the outer edge and an inner stepped portion (28) at the inner edge. The top surface of the lower sealing ring (31) is stepped, with an inner annular sealing surface (32) at the inner edge and an outer annular sealing surface (33) at the outer edge. When the upper sealing ring (26) and the lower sealing ring (31) are joined, the inner annular sealing surface (32) can abut against the inner stepped portion (28), and the outer annular sealing surface (33) can abut against the outer stepped portion (29).

2. The multi-working-condition adaptive fluorine material axial flow pump according to claim 1, characterized in that: The top surface of the lower fluoropolymer sleeve (8) is recessed inward to form a lower locking groove (23), and the outer side of the lower locking groove (23) is formed with a lower locking protrusion (22); the bottom surface of the fluoropolymer sleeve (14) is recessed downward to form a second locking groove (19), and the lower locking protrusion (22) can be engaged in the second locking groove (19). A second extended locking protrusion (20) is formed between the second locking groove (19) and the inner wall surface of the fluoropolymer sleeve (14), and the second extended locking protrusion (20) can be engaged in the lower locking groove (23).

3. The multi-working-condition adaptive fluorine material axial flow pump according to claim 2, characterized in that: The lower groove (23) extends to the top of the inner wall of the fluoromaterial sleeve (8) to form an upwardly protruding second sealing edge ring (21). The second extended protrusion (20) extends upward along the inner wall of the fluoromaterial jacket (14) to form a second sealing surface (18). The second sealing edge ring (21) is fastened to the second sealing surface (18).

4. The multi-working-condition adaptive fluorine material axial flow pump according to claim 3, characterized in that: A sealing ring (35) is provided on the contact surface between the inner stepped portion (28) and the inner annular sealing surface (32).

5. The multi-working-condition adaptive fluorine material axial flow pump according to claim 1, characterized in that: The inner wall of the lower fluorine material sleeve (8) is provided with inner blades (10) arranged in a circumferential spiral, and the inner wall of the upper fluorine material sleeve (7) is provided with guide grooves (24) arranged in a circumferential spiral.

6. A multi-condition adaptable fluoropolymer axial flow pump according to claim 5, characterized in that: The inner blade (10) includes a leaf root (101) fixed to the inner wall of the lower fluorine material sleeve (8) and a leaf edge (102) located at the outer end of the leaf root (101). The leaf edge (102) is twisted in the direction from the leaf root (101) to form a twisted surface (105) on the outer wall. The bottom and top of the inner blade (10) are respectively formed with a leaf bottom edge (103) and a leaf top edge (104). The inner blade (10) gradually widens from the leaf bottom edge (103) to the leaf top edge (104) and forms a wide edge (106) at the leaf edge (102).

Images