A composite support shaft structure for a magnetic pump

Abstract

This invention provides a composite support shaft structure for a magnetic pump, belonging to the field of magnetic pump technology. It solves the technical problems of existing magnetic pump support shafts, such as susceptibility to corrosion from the pumped medium, insufficient sealing reliability, and difficulty in simultaneously achieving rigid support and vibration suppression during high-speed operation. This composite support shaft structure includes a shield and an integrally formed support shaft fixedly connected to it. The support shaft has a fixed section and a support section that are perpendicular to each other; a fixed shaft with an open end is fitted around the outer periphery of the support section; an elastic washer is provided between the shield, the support shaft, and / or the fixed shaft; a sealing structure is provided between the fixed section and the shield, and around the opening end of the receiving hole. This invention has advantages such as high support rigidity, complete isolation from corrosive media, good sealing reliability, effective suppression of vibration and noise, stable operation, and long service life.

Description

Technical Field

[0001] This invention relates to the field of magnetic pump technology, specifically to a composite support shaft structure for a magnetic pump. Background Technology

[0002] Magnetic pumps, as a type of sealed pump equipment that uses non-contact magnetic coupling transmission, are widely used in applications such as conveying corrosive, flammable, explosive, toxic, or high-purity media, including chemical, pharmaceutical, electroplating, semiconductor, and photovoltaic industries, because they can achieve complete media isolation and eliminate shaft seal leakage.

[0003] In the core structure of a magnetic pump, the shaft system supporting the rotor assembly is a key component ensuring its long-term stable operation. The support shaft must not only withstand the combined loads of the rotor weight, fluid radial force, and impeller axial thrust, but also maintain sufficient rigidity and stability under high-speed rotation, while simultaneously resisting chemical corrosion from the medium. Currently, existing support shaft structures employ a composite fixed shaft structure, such as the one disclosed in CN104791257B for a permanent magnet filling pump. This structure combines a metal shaft and a fixed shaft, with a ceramic bushing and rear cover providing radial sealing protection to the internal metal shaft via a sealing ring. However, this design relies primarily on the slender metal shaft for radial support. Under the force of the rotor assembly and impeller rotation, the fixed shaft will radially wobble relative to the metal shaft, leading to seal failure or wear, leakage, and chemical or electrochemical corrosion on the metal shaft surface. This results in a gradual decrease in shaft diameter and an increase in the clearance between the shaft and bearings, ultimately causing increased rotor vibration, reduced efficiency, and in severe cases, shaft breakage.

[0004] To address the corrosion resistance and sealing issues, CN118564471B proposes an internal rotor magnetic pump that uses a plastic mounting column integrally injection-molded with the stator shield as a support component. This structure eliminates the need for additional seals, offers good overall corrosion resistance, and avoids the need for a support structure at the fluid inlet, thus reducing flow resistance. However, the plastic material has a low modulus of elasticity, and the cantilevered mounting column is prone to bending deformation during high-speed rotation, leading to increased radial sway in the rotor system, potentially causing vibration and affecting operational stability and service life.

[0005] To balance corrosion resistance and high rigidity, CN120384879B proposes a single-support shaft magnetic pump using a ceramic support shaft. Ceramics possess excellent corrosion resistance, high hardness, and high rigidity, effectively suppressing deformation and vibration at high speeds. However, ceramic materials are expensive, difficult to process, and suffer from high brittleness and poor impact resistance. Furthermore, meeting rigidity requirements often necessitates increasing the shaft diameter, further increasing cost and overall structural dimensions.

[0006] In summary, existing support shaft structures for magnetic pumps struggle to achieve an ideal balance between corrosion resistance, mechanical rigidity, operational reliability, and manufacturing cost. Therefore, there is an urgent need to develop a new support structure that possesses excellent corrosion resistance and sufficient support rigidity, fundamentally avoids the risk of seal leakage, and also ensures reasonable economic efficiency, thus meeting the requirements for long-term, stable, and efficient operation of magnetic pumps in harsh media. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a composite support shaft structure for a magnetic pump.

[0008] The objective of this invention can be achieved through the following technical solution: a composite support shaft structure for a magnetic pump, comprising a shield and a support shaft fixedly connected to the shield. The support shaft is an integral rigid component, comprising a fixed section and a support section arranged perpendicularly to each other. The shield has an inwardly recessed cavity in its center, and the fixed section is fixedly connected to the bottom of the cavity. The shield also has a mounting hole coaxially arranged with the cavity. The support section passes through the mounting hole, and a fixed shaft is fixedly fitted onto its outer periphery. The fixed shaft has a receiving hole with one open end for accommodating the support section. An elastic washer is provided between the support shaft, the shield, and / or the fixed shaft. The fixed section and the support section can be integrally machined or welded.

[0009] This design employs a one-piece molded rigid material for the support shaft, preferably metal or alloy. The mutually perpendicular fixed and support sections form a main load-bearing structure with excellent mechanical properties, providing extremely high radial and axial rigidity support for the rotor assembly. Based on this high-rigidity core, the fixed shaft fitted around the support section can be designed with a smaller outer diameter. The fixed shaft has a receiving hole open at only one end, within which the support shaft is completely encapsulated. Sealing only the open end of the receiving hole achieves complete isolation between the support shaft and the conveying medium, fundamentally preventing chemical or electrochemical corrosion of the support shaft due to contact with corrosive media, ensuring long-term reliable dimensional stability and mechanical properties.

[0010] The high-rigidity support shaft body effectively suppresses radial wobble and shaft bending deformation of the rotor under high-speed rotation, thus ensuring smooth operation, low noise, and long service life of the magnetic pump. To further optimize the sealing effect at the end of the receiving hole, an elastic washer is provided between the support shaft, the shield, and / or the fixed shaft. This elastic washer not only plays an auxiliary sealing role but also prevents the risk of decoupling caused by the rigid connection between the support shaft and the fixed shaft when they rotate at high speed. That is, it prevents slight slippage or separation of the contact surface and provides flexible adaptive adjustment capability in the radial and axial directions between the support shaft, the shield, and the fixed shaft, thereby achieving a better dynamic seal for the receiving hole.

[0011] Furthermore, the shielding cover includes an outer sleeve and an inner sleeve that are fixedly connected, the cavity is integrally formed with the inner sleeve, and the fixing section is fixed between the bottom of the outer sleeve and the cavity.

[0012] Furthermore, a first mounting seat protrudes from the bottom of the cavity toward its opening end; the first mounting seat has a first stepped hole and a second stepped hole communicating with the mounting hole, and the diameter of the second stepped hole is larger than the diameter of the first stepped hole; a first flange section protrudes radially from one end of the support section adjacent to the fixing section, and the opening end of the fixing shaft abuts axially with the end of the first flange section; the elastic washer is disposed in the first stepped hole and abuts against the first flange section and the fixing shaft radially and axially respectively; a first sealing member is disposed in the second stepped hole, and the first sealing member abuts radially against the fixing shaft.

[0013] Furthermore, there is at least one first seal.

[0014] The elastic washer in this design is positioned within the first stepped hole and abuts against both the first flange section and the fixed shaft in the radial and axial directions. This not only provides continuous elastic clamping force and vibration damping between the support shaft and the fixed shaft, effectively preventing rigid impact or decoupling during high-speed operation, but also assists in achieving dynamic sealing at the orifice through its own radial deformation capability. Furthermore, the first sealing element, located within the second stepped hole, abuts tightly against the fixed shaft in the radial direction, forming the first static sealing barrier against the opening of the orifice. Working in conjunction with the elastic washer, it reliably isolates the external medium.

[0015] Furthermore, a filling layer for sealing and fixing is provided between the fixing section and the outer end face of the shielding cover. The filling layer can be a layer formed by casting, potting, or coating with a curable material, such as an epoxy resin layer, silicone layer, or polyurethane layer; it can also be a mechanical seal, such as a plastic bushing. The filling sequence of the filling layer can be changed according to actual needs.

[0016] Furthermore, a second flange protrudes radially from one end of the support section adjacent to the fixed section, and the open end of the fixed shaft abuts axially against the second flange. A second mounting seat protrudes from the bottom of the cavity towards its open end, and a third stepped hole communicating with the mounting hole is formed within the second mounting seat. The elastic washer is disposed within the third stepped hole and abuts radially against the second flange, while also abutting against the fixed shaft in both the axial and radial directions. The elastic washer has a U-shaped cross-section and wraps around the end and outer periphery of the fixed shaft.

[0017] Furthermore, a flat key is provided between the fixed shaft and the support section, and a second fastener passes through the support section and is fastened to the bottom of the receiving hole.

[0018] This solution effectively improves the sealing reliability of the receiving orifice and the connection stability of the fixed shaft by integrating sealing, positioning, and connection structures. An elastic washer is positioned within the third-step hole, simultaneously abutting radially against the second flange section and axially and radially against the fixed shaft. This provides continuous elastic compression and vibration damping between the support shaft and the fixed shaft, preventing decoupling during high-speed operation. Furthermore, its radial deformation assists in achieving dynamic sealing at the receiving orifice. To further enhance the root seal, a filling layer for sealing and fixation is provided between the fixed section and the outer end face of the shield. Regarding the fixing of the fixed shaft, in addition to limiting its position through axial abutment between its open end and the second flange section, a flat key is used between the fixed shaft and the support section to transmit torque and prevent circumferential rotation. A second fastener passes through the support section and is securely connected to the bottom of the receiving orifice, forming a multi-directional locking mechanism that resists rotation and pull-out, ensuring the fixed shaft maintains a high-strength connection under complex operating conditions.

[0019] Furthermore, a third flange protrudes radially from one end of the support section adjacent to the fixed section, and the open end of the fixed shaft axially abuts against the third flange. A third mounting seat protrudes from the bottom of the cavity toward its open end. A fourth stepped hole communicating with the mounting hole is opened in the third mounting seat. The diameter of the fourth stepped hole is smaller than the diameter of the mounting hole. A fixing ring protrudes radially outward from the open end of the fixed shaft. The fixing ring is located inside the mounting hole and abuts radially against the mounting hole. An elastic washer is provided between the fixing ring and the shoulder of the fourth stepped hole. A second sealing element is provided between the outer peripheral surface of the support section and the inner wall of the fourth stepped hole.

[0020] The elastic washer in this design is positioned between the fixed ring and the shoulder of the fourth-step hole, providing continuous axial elastic preload to the fixed shaft to prevent loosening, absorb vibrations and impacts during operation, and assist in achieving a dynamic seal between the fixed ring and the shoulder through its own compression deformation. For the orifice sealing of the receiving hole, this design employs a layered sealing strategy: the filling layer between the fixed section and the outer end face of the shield forms the root base seal, which can be selected as a curing material layer or a mechanical seal as needed; the second seal between the support section and the inner wall of the fourth-step hole forms the first radial seal; the elastic washer provides the second axial seal; and the fixed ring, mounting hole, and filling layer abut against each other to form the third seal, thus creating a multi-stage sealing system. For fixing the fixed shaft, this design achieves composite locking: the axial abutment between the open end of the fixed shaft and the third flange section provides primary limiting; the radially protruding fixed ring fits tightly against the inner wall of the mounting hole to achieve radial positioning; combined with the continuous axial clamping force of the elastic washer, a reliable fixed connection with vibration resistance, anti-loosening self-adaptive sealing is ultimately formed.

[0021] Furthermore, the supporting section has a fourth flange section that protrudes radially from one end adjacent to the fixed section. The open end of the fixed shaft abuts axially against the fourth flange section. One end of the elastic washer abuts axially against the fixed section, and the other end abuts axially against both the open end of the fixed shaft and the bottom of the cavity. The inner circumferential surface of the elastic washer abuts radially against the fourth flange section. The outer circumference of the supporting section has at least one fixing ring groove that protrudes radially outward. The wall of the mounting hole has a fixing protrusion that mates with the fixing ring groove.

[0022] Furthermore, a second connector is integrally formed and fixed at the bottom of the cavity, and a third fastener passes through the fixing section and the filling layer in sequence and is then fastened to the second connector.

[0023] This solution achieves a highly reliable seal at the orifice and a multi-dimensional, stable connection between the fixed shaft and the accommodating orifice through a multi-stage linkage sealing and interlocking fixing structure. One end of the elastic washer axially abuts against the fixed section, while the other end simultaneously abuts against the open end of the fixed shaft and the bottom of the cavity. Its inner circumferential surface also radially abuts against the fourth flange section, thus playing a triple role in both axial and radial directions: providing continuous elastic preload to the fixed shaft to resist axial loosening, enhancing the dynamic sealing of the orifice area through multi-directional compression deformation, and absorbing and isolating vibrations generated during system operation. In terms of sealing, the filling layer between the fixed section and the outer end face of the shielding cover constitutes the base of the static seal, while the multi-directional abutment of the elastic washer forms a composite dynamic sealing interface at the accommodating orifice. In terms of fixing, the fixed shaft achieves initial positioning through its open end abutting against the fourth flange section; the fixing annular groove on the outer circumference of the support section engages with the fixing protrusion on the mounting hole wall, forming a mechanical interlock for anti-rotation and axial limiting; the fixed shaft in this solution can be integrally formed with the shielding sleeve as an insert. Furthermore, a third fastener passes through the fixed section and the filling layer, and is securely connected to the second connector integrally formed at the bottom of the cavity, thereby achieving final axial tension from the core of the support shaft to the shield body. This series of designs effectively constrains the fixed shaft in the axial, radial, and circumferential directions, forming a comprehensive fixing effect that is vibration-resistant and prevents loosening.

[0024] Compared with existing technologies, the technical advantages of this invention are as follows: By employing an integrally molded rigid support shaft as a high-rigidity core, and completely encapsulating it within the receiving hole of the fixed shaft, corrosive media are fundamentally isolated, solving the problems of corrosion of existing metal shafts and high brittleness and cost of ceramic shafts; by setting elastic washers, vibration damping and dynamic sealing are provided while effectively preventing the risk of decoupling between the support shaft and the fixed shaft at high speeds; combined with the filling layer, multiple seals, and various mechanical interlocking and fastening connection methods, a multi-level redundant sealing system for the receiving hole and a robust connection structure that is vibration-resistant and resistant to loosening are formed. This solution thus achieves a comprehensive balance of corrosion resistance, high support rigidity, operational reliability, and economy, meeting the requirements of long-term, stable, and efficient operation of magnetic pumps in harsh media. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention.

[0026] Figure 2 This is an enlarged view of section A in Embodiment 1 of the present invention.

[0027] Figure 3 This is a partial cross-sectional view of Embodiment 2 of the present invention.

[0028] Figure 4 This is a cross-sectional view of three parts of an embodiment of the present invention.

[0029] Figure 5 This is a cross-sectional view of four parts of an embodiment of the present invention.

[0030] Drawing number markings: 1. Shielding cover; 11. Cavity; 12. Mounting hole; 121. Fixing protrusion; 13. Outer sleeve; 14. Inner sleeve; 15. First mounting base; 151. First stepped hole; 152. Second stepped hole; 16. Second mounting base; 161. Third stepped hole; 17. Third mounting base; 171. Fourth stepped hole; 18. Second connecting piece; 19. Thrust hole; 2. Support shaft; 21. Fixed section; 211. Fixing annular groove; 22. Support section ; 221, First flange section; 222, Second flange section; 223, Third flange section; 224, Fourth flange section; 3, Fixed shaft; 31, Receiving hole; 32, Fixed ring; 4, Elastic washer; 5, First seal; 61, First fastener; 62, Second fastener; 63, Third fastener; 7, Filler layer; 8, Flat key; 9, Second seal; 100, Thrust member; 200, Rotor assembly; 300, Stator assembly; 400, Rotating member. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0032] according to Figure 1 and Figure 2 As shown, a composite support shaft 2 structure for a magnetic pump includes a shield 1 and a support shaft 2 fixedly connected to the shield 1. The support shaft 2 is an integral rigid component, preferably made of metal or alloy, and includes a fixed section 21 and a support section 22 arranged perpendicularly to each other. The fixed section 21 and the support section 22 can be assembled into an integral rigid component in various ways. These methods include, but are not limited to, casting, welding, threaded connection, cold pressing / heat fitting, riveting, bonding, and machining, making the fixed section 21 and the support section 22 functionally inseparable or requiring no disassembly, thus improving structural strength, simplifying assembly, and improving sealing. The shield 1 has an inwardly recessed cavity 11 in its center, within which a rotor assembly 200 is disposed. The shield 1 also has a stator fixing cavity formed inside, within which a stator assembly 300 is disposed. The shield 1 is also provided with a thrust hole 19 coaxial with the cavity 11, and a thrust member 100 is installed in the thrust hole 19. The fixed section 21 is fixedly connected to the bottom of the cavity 11. The shield 1 also has a mounting hole 12 coaxially arranged with the cavity 11. The support section 22 passes through the mounting hole 12, and a fixed shaft 3 is fixedly fitted onto its outer periphery. The fixed shaft 3 has a receiving hole 31 with one open end for accommodating the support section 22. An elastic washer 4 is provided between the shield 1, the support shaft 2, and / or the fixed shaft 3. A rotating member 400 is slidably fitted onto the outer periphery of the fixed shaft 3, and the rotating member 400 is fixedly connected to the rotor assembly 200. One end of the rotating member 400 slides against one end of the thrust member 100. The rotating member 400 and the fixed shaft 3 should be made of ceramic, silicon carbide, or a material with similar properties. The fixed shaft 3 and the support section 22 are axially fixed together by a flat key 8.

[0033] Furthermore, the shielding cover 1 includes an outer sleeve 13 and an inner sleeve 14 that are fixedly connected by injection molding, welding, interference fit or bolts. The cavity 11 and the inner sleeve 14 are integrally formed by injection molding. The fixing section 21 is clamped and fixed between the bottom of the outer sleeve 13 and the cavity 11. The outer diameter of the fixing section 21 is infinitely close to or greater than the maximum outer diameter of the stator fixing cavity.

[0034] A first mounting base 15 protrudes from the bottom of the cavity 11 toward its opening end. The first mounting base 15 has a first stepped hole 151 and a second stepped hole 152 communicating with the mounting hole 12. The diameter of the second stepped hole 152 is larger than the diameter of the first stepped hole 151, the diameter of the first stepped hole 151 is larger than the diameter of the mounting hole 12, and the diameter of the thrust hole 19 is larger than the diameter of the second stepped hole 152. The mounting hole 12, the first stepped hole 151, the second stepped hole 152, and the thrust hole 19 are arranged sequentially along the axial direction. A first flange section 221 protrudes radially from one end of the support section 22 adjacent to the fixed section 21. The opening end of the fixed shaft 3 axially abuts against the end of the first flange section 221. An elastic washer 4 is disposed within the first stepped hole 151 and abuts radially and axially against the outer periphery of the first flange section 221 and the opening end of the fixed shaft 3, respectively. A first sealing element 5 is provided inside the second step hole 152, and the first sealing element 5 radially abuts against the outer peripheral surface of the fixed shaft 3. The first sealing element 5 is an O-ring or the like, and one to three first sealing elements 5 are used, with two being preferred.

[0035] The fixed shaft 3 is an integrally formed U-shaped structure. Its inner bottom wall, away from the opening end, has a radially outward-protruding fixing groove. The fixing groove is directly connected to the receiving hole 31, and the diameter of the fixing groove is larger than the diameter of the receiving hole 31. A first connecting member is integrally formed within the fixing groove. The first connecting member is a metal nut or a threaded metal part, and is fixed within the fixing groove by casting. A first fastener 61 passes through the axial hole at the end of the support section 22 and is threadedly fastened to the first connecting member. The fixed shaft adopts an integrally formed U-shaped structure, with a radially outward-protruding fixing groove on its inner side away from the opening end. The integrally formed first connecting member within the fixing groove is fastened to the support section by the first fastener. This design ensures a high-strength, anti-loosening rigid connection between the fixed shaft and the support section. Furthermore, its U-shaped covering structure and inner fixing groove enhance the positioning and protection of the support section, giving the entire support shaft system excellent sealing reliability, operational stability, and structural connection strength.

[0036] The support shaft 2 is made of a single piece of rigid material. Its fixed section 21 and support section 22, which are arranged perpendicularly to each other, form a main load-bearing structure with excellent mechanical properties, providing extremely high radial and axial rigidity support for the rotor assembly 200. Based on this high-rigidity core, the fixed shaft 3, which is fitted around the support section 22, can be designed with a small outer diameter. The fixed shaft 3 has a receiving hole 31 with only one open end. The support shaft 2 is completely encapsulated in this receiving hole 31. Only the open end of the receiving hole 31 needs to be sealed to achieve complete isolation between the support shaft 2 and the conveying medium. This fundamentally prevents the support shaft 2 from chemical or electrochemical corrosion due to contact with corrosive media, ensuring its dimensional stability and long-term reliable mechanical properties.

[0037] The high-rigidity support shaft 2 effectively suppresses radial sway and shaft bending deformation of the rotor under high-speed rotation, thus ensuring smooth operation, low noise, and long service life of the magnetic pump. To further optimize the sealing effect at the end of the receiving hole 31, an elastic washer 4 is provided between the support shaft 2, the shield 1, and the fixed shaft 3. This elastic washer 4 not only plays an auxiliary sealing role, but also prevents the risk of decoupling caused by the rigid connection between the support shaft 2 and the fixed shaft 3 when they are running at high speed, that is, prevents slight slippage or separation of the contact surface, and provides radial and axial flexible adaptive adjustment capability between the support shaft 2, the shield 1, and the fixed shaft 3, thereby achieving a better dynamic seal for the receiving hole 31. Example

[0038] according to Figure 3 As shown, based on Embodiment 1, this embodiment provides another implementation method. A filling layer 7 for sealing and fixing is provided between the fixing section 21 and the outer end face of the shielding cover 1. The filling layer 7 can be a sealing layer formed by casting, potting, or coating with curable materials such as epoxy resin, silicone, or polyurethane; it can also be a mechanical seal such as a plastic bushing.

[0039] A second flange section 222 protrudes radially from one end of the support section 22 adjacent to the fixed section 21. The open end of the fixed shaft 3 axially abuts against the second flange section 222. A second mounting seat 16 protrudes from the bottom of the cavity 11 toward its open end. The second mounting seat 16 has a third stepped hole 161 communicating with the mounting hole 12. The diameter of the third stepped hole 161 is larger than the diameter of the mounting hole 12. An elastic washer 4 is disposed in the third stepped hole 161 and abuts radially against the second flange section 222, while also abutting against the fixed shaft 3 in both the axial and radial directions. Preferably, the cross-section of the elastic washer 4 is a U-shaped opening in the middle, which wraps around the open end of the fixed shaft 3 and part of its outer periphery. A second fastener 62 passes through the support section 22 and is threadedly fastened to the bottom of the receiving hole 31.

[0040] This embodiment effectively improves the sealing reliability of the receiving hole 31 and the connection stability of the fixed shaft 3 by integrating sealing, positioning, and connection structures. The elastic washer 4 is disposed within the third stepped hole 161 and simultaneously abuts radially against the second flange section 222 and axially and radially against the fixed shaft 3. This not only provides continuous elastic compression and vibration damping between the support shaft 2 and the fixed shaft 3, preventing decoupling during high-speed operation, but also assists in achieving dynamic sealing at the receiving hole 31 through its radial deformation. To further enhance the root seal, a filling layer 7 for sealing and fixing is provided between the fixed section 21 and the outer end face of the shield 1. Regarding the fixing of the fixed shaft 3, in addition to limiting its position by axially abutting its open end against the second flange section 222, a flat key 8 is also provided between the fixed shaft 3 and the support section 22 to transmit torque and prevent circumferential rotation. The second fastener 62 passes through the support section 22 and is fastened to the bottom of the receiving hole 31, thereby forming a multi-directional locking that is anti-rotation and anti-pull-out, ensuring that the fixed shaft 3 maintains a high-strength connection under complex working conditions. Example

[0041] according to Figure 4 As shown, this embodiment illustrates another structural configuration. A third flange section 223 protrudes radially from one end of the support section 22 adjacent to the fixed section 21. The open end of the fixed shaft 3 axially abuts against the third flange section 223. A third mounting seat 17 protrudes from the bottom of the cavity 11 towards its open end. A fourth stepped hole 171 communicating with the mounting hole 12 is provided within the third mounting seat 17, the diameter of which is smaller than the diameter of the mounting hole 12. A fixing ring portion 32 protrudes radially outward from the open end of the fixed shaft 3. The fixing ring portion 32 is located within the mounting hole 12 and radially abuts against the hole wall of the mounting hole 12. An elastic washer 4 is provided between the fixing ring portion 32 and the shoulder of the fourth stepped hole 171. Furthermore, a second sealing member 9 is provided between the outer peripheral surface of the support section 22 and the inner wall of the fourth stepped hole 171. A second connecting member 18 is integrally formed and fixed to the bottom of the cavity 11. The second connecting member 18 may be an embedded nut or a threaded sleeve.

[0042] An elastic washer 4 is provided between the shield 1 and the fixed shaft 3. The elastic washer 4 is located between the fixed ring 32 and the shoulder of the fourth stepped hole 171, providing continuous axial elastic preload to the fixed shaft 3 to prevent loosening, absorb vibration and impact during operation, and assist in achieving dynamic sealing between the fixed ring 32 and the shoulder through its own compression deformation. Regarding the orifice sealing of the receiving hole 31, this design adopts a layered sealing strategy: the filling layer 7 between the fixed section 21 and the outer end face of the shield 1 constitutes the root base seal, and a curing material layer or mechanical seal can be selected as needed; the second seal 9 provided between the support section 22 and the inner wall of the fourth stepped hole 171 constitutes the first radial seal, the elastic washer 4 provides the second axial seal, and the fixed ring 32, the mounting hole 12, and the filling layer 7 abut against each other to form the third seal, thus forming a multi-stage sealing system. For fixing the fixed shaft 3, this solution achieves a composite locking: the axial abutment between the open end of the fixed shaft 3 and the third flange section 223 provides primary limiting; its radially protruding fixing ring 32 tightly fits the inner wall of the mounting hole 12 to achieve radial positioning; combined with the continuous axial clamping force of the elastic washer 4, a reliable fixed connection with vibration resistance, anti-loosening self-adaptive sealing is finally formed. Example

[0043] according to Figure 5 As shown, this embodiment provides another differentiated design. A fourth flange section 224 protrudes radially from one end of the support section 22 adjacent to the fixed section 21. The open end of the fixed shaft 3 axially abuts against the fourth flange section 224. One end of the elastic washer 4 axially abuts against the fixed section 21, and the other end axially abuts against both the open end of the fixed shaft 3 and the bottom of the cavity 11; the inner circumferential surface of the elastic washer 4 radially abuts against the fourth flange section 224. At least one fixing annular groove 211 protrudes radially outward from the outer circumference of the support section 22. The mounting hole 12 has a fixing protrusion 121 on its wall that mates with the fixing annular groove 211, and the two engage with each other.

[0044] Furthermore, a second connector 18 (such as an embedded nut or threaded sleeve) is integrally formed and fixed at the bottom of the cavity 11. The third fastener 63 passes through the fixing section 21 and the filling layer 7 in sequence and is then fastened to the second connector 18. In this embodiment, the fixing shaft 3 can also be used as an insert and integrally formed with it during the injection molding process of the shielding cover 1.

[0045] This embodiment achieves a highly reliable seal at the orifice 31 and a multi-dimensional stable connection with the fixed shaft 3 through a multi-stage linkage sealing and interlocking fixing structure. One end of the elastic washer 4 axially abuts against the fixed section 21, while the other end simultaneously abuts against the opening end of the fixed shaft 3 and the bottom of the cavity 11. Its inner circumferential surface also radially abuts against the fourth flange section 224, thus playing a triple role in both axial and radial directions: providing continuous elastic preload to the fixed shaft 3 to resist axial loosening, enhancing the dynamic sealing of the orifice area through multi-directional compression deformation, and absorbing and isolating vibrations generated during system operation. In terms of sealing, the filling layer 7 between the fixed section 21 and the outer end face of the shield 1 constitutes the root static sealing base, while the multi-directional abutment of the elastic washer 4 forms a composite dynamic sealing interface at the orifice 31. In terms of fixation, the fixed shaft 3 achieves initial positioning by axially abutting its open end against the fourth flange section 224; the fixing annular groove 211 on the outer periphery of the support section 22 engages with the fixing protrusion 121 on the wall of the mounting hole 12, forming a mechanical interlock for anti-rotation and axial limiting; the fixed shaft 3 in this design can be integrally formed with the shielding sleeve as an insert. Furthermore, the third fastener 63 passes through the fixed section 21 and the filling layer 7, and is securely connected to the second connecting piece 18 integrally formed at the bottom of the cavity 11, thereby achieving the final axial tension from the core of the support shaft 2 to the body of the shielding cover 1. This series of designs effectively constrains the fixed shaft 3 in the axial, radial, and circumferential directions, forming a comprehensive fixation effect that is anti-vibration and anti-loosening.

[0046] It should be noted that the features in the above embodiments can be freely combined as long as they do not conflict, thereby forming more specific implementation methods, all of which fall within the protection scope of this invention. The above embodiments are merely preferred embodiments of this invention and are not intended to limit the protection scope of this invention. Therefore, all equivalent changes made to the structure, shape, and principle of this invention should be covered within the protection scope defined by the claims of this invention.

Claims

1. A composite support shaft structure for a magnetic pump, comprising a shield (1) and a support shaft (2) fixedly connected to the shield (1), characterized in that: The support shaft (2) is an integral rigid component, comprising a fixed section (21) and a support section (22) arranged perpendicularly to each other; the shield (1) has an inwardly recessed cavity (11) in the middle, and the fixed section (21) is fixedly connected to the bottom of the cavity (11); the shield (1) also has a mounting hole (12), which is coaxially arranged with the cavity (11); the support section (22) passes through the mounting hole (12), and a fixed shaft (3) is fixedly fitted on its outer periphery; the fixed shaft (3) has a receiving hole (31) with one end open for accommodating the support section (22); an elastic washer (4) is provided between the support shaft (2), the shield (1) and / or the fixed shaft (3); The bottom of the cavity (11) is provided with a first mounting seat (15) protruding towards its opening end; the first mounting seat (15) is provided with a first stepped hole (151) and a second stepped hole (152) communicating with the mounting hole (12), and the diameter of the second stepped hole (152) is larger than the diameter of the first stepped hole (151); the support section (22) has a first flange section (221) protruding radially from one end adjacent to the fixed section (21), and the opening end of the fixed shaft (3) abuts axially with the end of the first flange section (221); the elastic washer (4) is disposed in the first stepped hole (151) and abuts against the first flange section (221) and the fixed shaft (3) in the radial and axial directions respectively; a first sealing element (5) is disposed in the second stepped hole (152), and the first sealing element (5) abuts radially with the fixed shaft (3).

2. The composite support shaft structure of a magnetic pump according to claim 1, characterized in that: The shield (1) includes an outer sleeve (13) and an inner sleeve (14) that are fixedly connected. The cavity (11) and the inner sleeve (14) are integrally formed. The fixing section (21) is fixed between the bottom of the outer sleeve (13) and the cavity (11).

3. The composite support shaft structure of a magnetic pump according to claim 1, characterized in that: There is at least one first seal (5).

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