Composite structure isolation sleeve

Abstract

This invention discloses a composite structure isolation sleeve, comprising an inner sheath, an intermediate sheath, and an outer sheath. Both the inner and outer sheaths are polyetheretherketone (PEEK) sleeves. The intermediate sheath includes several non-magnetic laminations stacked sequentially along the axial direction. Adjacent non-magnetic laminations are insulated from each other, and the inner walls of all non-magnetic laminations are fitted to the outer wall of the inner sheath. This invention achieves a balance of key performance indicators, including low eddy current loss, high mechanical strength, and high sealing reliability. The non-magnetic laminations, due to their low permeability, avoid becoming part of the magnetic circuit. The insulation between the non-magnetic laminations divides the continuous conductor path into multiple insulated micro-conductive loops, significantly cutting off large-scale eddy current paths that may form in an alternating magnetic field, thereby reducing the total eddy current loss of all non-magnetic laminations in the alternating magnetic field.

Description

Technical Field

[0001] This invention belongs to the field of magnetic coupling technology, and particularly relates to a composite structure isolation sleeve. Background Technology

[0002] Magnetic couplings achieve contactless torque transmission through the magnetic force of permanent magnets. Their core advantages lie in complete sealing and zero leakage. They are widely used in petroleum, chemical, and pharmaceutical industries for transporting hazardous, expensive, or special fluids. The isolation sleeve is a key component for achieving static sealing in magnetic couplings. It needs to isolate the working medium and withstand the pressure difference between the inner and outer rotors. Furthermore, its eddy current losses are a crucial factor affecting the transmission efficiency and temperature rise of the magnetic coupling.

[0003] Currently, the isolation sleeves used in magnetic couplings are mainly metal isolation sleeves, engineering ceramic isolation sleeves, and composite material isolation sleeves.

[0004] Metal isolation sleeves typically use high-performance metal materials such as Hastelloy and titanium alloys to ensure excellent mechanical strength and pressure resistance. However, due to their high electrical conductivity, metal isolation sleeves generate huge eddy current losses in high-speed alternating magnetic fields, resulting in a significant reduction in transmission efficiency and severe self-heating. This not only wastes energy but may also cause the permanent magnet to demagnetize due to excessive temperature rise, thereby endangering equipment safety.

[0005] Engineering ceramic isolation sleeves are typically made of non-metallic materials such as zirconium oxide and silicon oxide, which have extremely low electrical conductivity and low eddy current loss. However, engineering ceramic isolation sleeves are inherently brittle, have poor impact and thermal shock resistance, and are expensive to manufacture. In addition, the connection and encapsulation processes between them and metal components are difficult, posing a potential risk of leakage.

[0006] Composite material isolation sleeves are typically made of materials such as carbon fiber and glass fiber as reinforcements and epoxy resin and polyimide as matrix materials. They have extremely low eddy current loss, light weight, high specific strength and good corrosion resistance. However, the long-term high temperature resistance of composite material isolation sleeves is limited by the resin matrix. They have low interlaminar shear strength and are prone to delamination failure under long-term alternating loads or high pressure. Their manufacturing process is complex and costly.

[0007] In summary, existing isolation sleeves cannot simultaneously achieve the key performance indicators of low eddy current loss, high mechanical strength, and high sealing reliability. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention provides a composite structure isolation sleeve that can simultaneously achieve several key performance indicators, including low eddy current loss, high mechanical strength, and high sealing reliability.

[0009] The objective of this invention is achieved through the following technical solution: A composite structure isolation sleeve, comprising: Inner sheath, the inner sheath is a polyetheretherketone sheath; The intermediate sleeve comprises several non-magnetic laminations stacked sequentially along the axial direction, with insulation between adjacent non-magnetic laminations, and the inner wall of all non-magnetic laminations fitting against the outer wall of the inner sleeve. The outer sheath is made of polyetheretherketone (PEEK) and its inner wall is fitted to the outer wall of all non-magnetic stampings.

[0010] The beneficial effects of adopting the above technical solution are as follows: the inner and outer sheaths made of polyetheretherketone (PEEK) material have dense, non-porous plastic properties, enabling absolute static sealing and significantly improving sealing reliability; simultaneously, the inner and outer sheaths of PEEK material have good electrical insulation properties, which can eliminate eddy current generation to a certain extent, thereby helping to reduce eddy current losses; furthermore, when the inner sheath and outer sheath are subjected to pressure, the fluid pressure can be immediately transmitted to the rigid load-bearing body of the tightly fitted intermediate sleeve, which provides rigid reaction force to limit the radial expansion of the inner sheath and the outer sheath. The radial contraction of the non-magnetic laminations forms stable internal and external pressure-bearing systems, significantly improving mechanical strength. Furthermore, the low permeability of the non-magnetic laminations prevents them from becoming part of the magnetic circuit. Insulation between the non-magnetic laminations divides the continuous conductor path into multiple insulated micro-conductive loops, greatly cutting off large-scale eddy current paths that may form in alternating magnetic fields, thus reducing the total eddy current loss of all non-magnetic laminations in alternating magnetic fields. In summary, this composite structure isolation sleeve achieves a balance between low eddy current loss, high mechanical strength, and high sealing reliability—key performance indicators.

[0011] Furthermore, the intermediate sleeve includes a base fitted at the lower part of the inner sheath, an upper pressure cap fitted at the upper part of the inner sheath, and several non-magnetic screws axially passing through all the non-magnetic punches. The several non-magnetic punches are located between the base and the upper pressure cap. One end of the non-magnetic screw is detachably connected to the base, and the other end of the non-magnetic screw passes through the upper pressure cap and is threaded with a non-magnetic nut.

[0012] The beneficial effects of adopting the above technical solution are as follows: by rotating the non-magnetic nut, a predetermined preload torque can be applied so that the lamination layer formed by several non-magnetic laminations becomes a pre-compressed and high-rigidity integral load-bearing cylinder; in addition, the non-magnetic screw and non-magnetic nut can avoid becoming part of the magnetic circuit due to their low magnetic permeability, which helps to reduce eddy current losses.

[0013] Furthermore, the intermediate sleeve includes a lamination retaining ring for providing an axial positioning reference. The lamination retaining ring is embedded between two non-magnetic laminations. The inner and outer walls of the lamination retaining ring are respectively attached to the outer wall of the inner sleeve and the inner wall of the outer sleeve. Several non-magnetic screws pass through the lamination retaining ring.

[0014] The beneficial effects of adopting the above technical solution are as follows: the retaining ring of the lamination is embedded between the two non-magnetic laminations to provide a precise axial positioning reference, thereby ensuring that the non-magnetic laminations are stacked neatly and thus preventing local tilting.

[0015] Furthermore, several non-magnetic screws are evenly inserted into the non-magnetic laminations along the circumference.

[0016] The beneficial effects of adopting the above technical solution are as follows: This setting helps to ensure that the non-magnetic stamping is subjected to uniform force, thereby reducing the risk of tilting of the non-magnetic stamping to a certain extent.

[0017] Furthermore, one end of the non-magnetic screw is threaded onto the base.

[0018] The beneficial effects of adopting the above technical solution are: this setting facilitates the installation and disassembly of the non-magnetic screw and is conducive to adjusting the working length of the non-magnetic screw.

[0019] Furthermore, the lower end of the base is detachably connected to an inner pressure cover, with the base pressing down on the inner sheath from top to bottom, and the inner pressure cover pressing down on the inner sheath from bottom to top.

[0020] The beneficial effect of adopting the above technical solution is that the base is fastened to the inner sheath by the inner pressure cover.

[0021] Furthermore, a first sealing gasket is provided between the base and the inner sheath; a second sealing gasket is provided between the inner pressure cover and the inner sheath.

[0022] The beneficial effects of adopting the above technical solution are as follows: on the basis of the overall plastic seal, multiple end face static seals are set to form a redundant sealing system, which is conducive to further improving the sealing reliability of the composite structure isolation sleeve.

[0023] Furthermore, the base is provided with a leak detection hole that runs through both the inside and outside. The outer end of the leak detection hole is used to install a leak detection sensor, and the inner end of the leak detection hole is located above the first sealing gasket.

[0024] The beneficial effects of adopting the above technical solution are as follows: This configuration facilitates the real-time detection of the integrity of the outer and inner sheaths using leak detection sensors; once the inner or outer sheath is damaged and leaks, the medium will enter the leak detection hole and be detected by the leak detection sensor, thereby enabling early warning.

[0025] Furthermore, an outer pressure cover is detachably connected to the upper end of the base. The base presses down on the outer sheath from bottom to top, and the outer pressure cover presses down on the outer sheath from top to bottom.

[0026] The beneficial effect of adopting the above technical solution is that the outer sheath is fastened to the base by the outer pressure cover.

[0027] Furthermore, a third sealing gasket is provided between the lower end face of the outer sheath and the base; and / or A fourth sealing gasket is provided between the lower end face of the outer pressure cap and the base; and / or A fifth sealing gasket is provided between the outer pressure cap and the outer sheath.

[0028] The beneficial effects of adopting the above technical solution are as follows: on the basis of the overall plastic seal, multiple end face static seals are set to form a redundant sealing system, which is conducive to further improving the sealing reliability of the composite structure isolation sleeve.

[0029] The beneficial effects of this invention are as follows: The inner and outer sheaths, made of polyetheretherketone (PEEK), possess dense, non-porous plastic properties, enabling absolute static sealing and significantly improving sealing reliability. Simultaneously, the PEEK sheaths exhibit excellent electrical insulation, effectively preventing eddy current generation and thus reducing eddy current losses. Furthermore, when pressure is applied to the interior of the inner sheath and the exterior of the outer sheath, the fluid pressure is immediately transferred to the rigid load-bearing intermediate sleeve, which provides rigid reaction force to limit the radial expansion of the inner sheath and the radial contraction of the outer sheath. These components respectively form a stable internal pressure-bearing system and an external pressure-bearing system, thereby significantly improving mechanical strength. Furthermore, the non-magnetic laminations, due to their low permeability, can avoid becoming part of the magnetic circuit. The insulation treatment between the non-magnetic laminations can divide the continuous conductor path into multiple small conductive loops that are insulated from each other. This greatly cuts off the large-scale eddy current path that may be formed in the alternating magnetic field, thereby reducing the total eddy current loss of all non-magnetic laminations in the alternating magnetic field. In summary, this composite structure isolation sleeve can achieve several key performance indicators such as low eddy current loss, high mechanical strength, and high sealing reliability. Attached Figure Description

[0030] The invention will now be described in more detail with reference to embodiments and the accompanying drawings. Figure 1 A schematic diagram of the structure of the present invention is shown; Figure 2 This invention shows a connection diagram at the base. In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0031] Figure label: 1. Outer sheath; 2. Inner sheath; 3. Non-magnetic nut; 4. Upper pressure cap; 5. Non-magnetic screw; 6. Non-magnetic lamination; 7. Lamination retaining ring; 8. Base; 9. First sealing gasket; 10. Second sealing gasket; 11. Inner pressure cap; 12. Third sealing gasket; 13. Fourth sealing gasket; 14. Outer pressure cap; 15. Fifth sealing gasket; 16. Leak detection sensor. Detailed Implementation

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] This invention provides a composite structure isolation sleeve, such as Figure 1-2 As shown, it includes: Inner sheath 2, inner sheath 2 is a polyetheretherketone sheath; The intermediate sleeve includes several non-magnetic sheets 6 stacked sequentially along the axial direction. Adjacent non-magnetic sheets 6 are insulated from each other, and the inner walls of all non-magnetic sheets 6 are in contact with the outer wall of the inner sleeve 2. Outer sheath 1, which is a polyetheretherketone sheath, has its inner wall fitted to the outer wall of all non-magnetic stampings 6.

[0034] Understandably, the inner sheath 2 and outer sheath 1 made of polyetheretherketone (PEEK) material possess dense, non-porous plastic properties, enabling absolute static sealing and significantly improving sealing reliability. Simultaneously, the inner sheath 2 and outer sheath 1 made of PEEK material have good electrical insulation properties, which can prevent eddy current generation to a certain extent, thus helping to reduce eddy current losses. Furthermore, when the inner sheath 2 is subjected to pressure and the outer sheath 1 is subjected to pressure, the fluid pressure can be immediately transmitted to the rigid load-bearing body, the intermediate sleeve, which is tightly fitted with it. The intermediate sleeve provides rigid reaction force to limit the radial expansion of the inner sheath 2. The radial contraction of the outer sheath 1 forms a stable inner pressure-bearing system and an outer pressure-bearing system, thereby significantly improving mechanical strength. Furthermore, the non-magnetic laminations 6, due to their low permeability, can avoid becoming part of the magnetic circuit. The insulation treatment between the non-magnetic laminations 6 can divide the continuous conductor path into multiple small conductive loops that are insulated from each other. This greatly cuts off the large-scale eddy current path that may be formed in the alternating magnetic field, thereby reducing the total eddy current loss of all non-magnetic laminations 6 in the alternating magnetic field. In summary, this composite structure isolation sleeve can take into account the key performance indicators of low eddy current loss, high mechanical strength, and high sealing reliability.

[0035] It should be noted that the inner sheath 2 and the outer sheath 1 are preferably made of high-performance engineering plastics such as polyetheretherketone (PEEK) and are integrally processed and molded; polyetheretherketone (PEEK) material has excellent electrical insulation, excellent mechanical strength and stiffness, excellent creep resistance, long-term high temperature resistance and excellent chemical stability. The inner sheath 2 performs three core functions. Function one is primary sealing; as the liner directly in contact with the transmission medium, the inner sheath 2 utilizes its dense, non-porous plasticity to achieve absolute static sealing and isolate the medium. Function two is corrosion and wear resistance; the inner sheath 2 protects all external metal components (such as the non-magnetic sheet 6) from chemical corrosion, electrochemical corrosion, and fluid erosion. Function three is internal pressure conduction; when the inner sheath 2 is under pressure, it uniformly converts the fluid pressure into a radially outward force, which is immediately transmitted to the rigid load-bearing body, the intermediate sleeve, which provides a rigid reaction force to limit the radial expansion of the inner sheath 2, thus forming a stable internal pressure-bearing system. The outer sheath 1 provides sealing, corrosion protection, and electrical insulation against the external environment. When the outer sheath 1 is subjected to external pressure, it uniformly converts the fluid pressure into a radially inward force. This force is immediately transmitted to the rigid load-bearing body, the intermediate sleeve, which is in close contact with it. The intermediate sleeve provides a rigid reaction force to limit the radial contraction of the inner sheath 2, thereby forming a stable external pressure-bearing system.

[0036] It should be noted that the non-magnetic stamping 6 can be made of non-magnetic materials such as austenitic stainless steel or nickel-based corrosion-resistant alloys; in addition, the surface of all non-magnetic stamping 6 is subjected to insulation treatment (such as anodizing, spraying ceramic insulation layer, etc.), and the insulation layers generated after the insulation treatment of the non-magnetic stamping 6 are separated from each other; when the non-magnetic stamping 6 is insulated, it is necessary to ensure that the insulation layer is continuous, dense and has sufficient mechanical strength and durability to withstand the preload and long-term working vibration.

[0037] It should also be noted that the principle of reducing eddy current loss in this invention is based on the law in electromagnetism that "eddy current loss is proportional to the square of the conductor thickness"; specifically, the thick metal cylinder is replaced with a large number of thin laminations that are insulated from each other, which is equivalent to reducing the conductor thickness to the thickness of a single layer of laminations, thereby reducing eddy current loss by orders of magnitude.

[0038] It should be noted that appropriate injection molding or machining processes must be used when processing the inner sheath 2 and the outer sheath 1 to ensure that the dimensions of the inner sheath 2 and the outer sheath 1 are accurate and free from internal stress concentration and microscopic defects.

[0039] In one embodiment, the intermediate sleeve includes a base 8 fitted onto the lower part of the inner sleeve 2, an upper pressure cap 4 fitted onto the upper part of the inner sleeve 2, and a plurality of non-magnetic screws 5 axially passing through all the non-magnetic punches 6. The plurality of non-magnetic punches 6 are located between the base 8 and the upper pressure cap 4. One end of the non-magnetic screw 5 is detachably connected to the base 8, and the other end of the non-magnetic screw 5 passes through the upper pressure cap 4 and is threadedly connected to a non-magnetic nut 3.

[0040] It is understandable that by rotating the non-magnetic nut 3, a predetermined preload torque can be applied so that the lamination layer formed by several non-magnetic laminations 6 becomes a pre-compressed and high-rigidity integral load-bearing cylinder; in addition, the non-magnetic screw 5 and the non-magnetic nut 3 can avoid becoming part of the magnetic circuit due to their low magnetic permeability, which helps to reduce eddy current losses.

[0041] It should be noted that the non-magnetic screw 5 and the non-magnetic nut 3 are made of non-magnetic materials such as austenitic stainless steel or nickel-based corrosion-resistant alloys; the base 8 can be made of corrosion-resistant alloys such as 316L stainless steel.

[0042] It should also be noted that the preload torque of the non-magnetic nut 3 should ensure that the lamination layer does not separate under the pressure difference between the inside and outside, and should also avoid excessive preload causing plastic deformation or damage to the inner sheath 2 or the outer sheath 1.

[0043] In one embodiment, the intermediate sleeve includes a lamination retaining ring 7 for providing an axial positioning reference. The lamination retaining ring 7 is embedded between two non-magnetic laminations 6. The inner wall and outer wall of the lamination retaining ring 7 are respectively attached to the outer wall of the inner sleeve 2 and the inner wall of the outer sleeve 1. A plurality of non-magnetic screws 5 pass through the lamination retaining ring 7. The lamination retaining ring 7 is made of non-metallic material.

[0044] Understandably, the retaining ring 7 is embedded between the two non-magnetic laminations 6 to provide a precise axial positioning reference, thereby ensuring that the non-magnetic laminations 6 are stacked neatly and thus preventing local tilting.

[0045] In one embodiment, a plurality of non-magnetic screws 5 are evenly inserted into the non-magnetic sheet 6 along the circumference, which helps to ensure that the non-magnetic sheet 6 is subjected to uniform force, thereby reducing the risk of tilting of the non-magnetic sheet 6 to a certain extent.

[0046] In one embodiment, one end of the non-magnetic screw 5 is threaded onto the base 8 to facilitate the installation and removal of the non-magnetic screw 5 and to allow for adjustment of the working length of the non-magnetic screw 5.

[0047] In one embodiment, the lower end of the base 8 is screwed to an inner pressure cover 11, the base 8 presses down on the inner sheath 2 from top to bottom, and the inner pressure cover 11 presses down on the inner sheath 2 from bottom to top, that is, the base 8 is fastened to the inner sheath 2 by the inner pressure cover 11.

[0048] In one embodiment, a first sealing gasket 9 is provided between the base 8 and the inner sheath 2; a second sealing gasket 10 is provided between the inner pressure cover 11 and the inner sheath 2.

[0049] It is understandable that, based on the overall plastic seal, multiple end face static seals are set at the lower end of the composite structure isolation sleeve to form a redundant sealing system, which is conducive to further improving the sealing reliability of the composite structure isolation sleeve.

[0050] It should be noted that the inner wall of the base 8 is provided with a sealing groove for inserting the first sealing gasket 9.

[0051] In one embodiment, the base 8 is provided with a leak detection hole that runs through both the inside and outside. The outer end of the leak detection hole is used to install a leak detection sensor 16, and the inner end of the leak detection hole is located above the first sealing gasket 9.

[0052] Understandably, this setup is designed to facilitate real-time detection of the integrity of the outer sheath 1 and the inner sheath 2 using the leak detection sensor 16; once the inner sheath 2 or the outer sheath 1 is damaged and leaks, the medium will enter the leak detection hole and be detected by the leak detection sensor 16, thereby enabling early warning.

[0053] It should be noted that the leak detection sensor 16 can be a pressure sensor or a humidity sensor.

[0054] In one embodiment, the upper end of the base 8 is screwed to an outer pressure cover 14, the base 8 presses the outer sheath 1 from bottom to top, and the outer pressure cover 14 presses the outer sheath 1 from top to bottom, that is, the outer sheath 1 is fastened to the base 8 by the outer pressure cover 14.

[0055] In one embodiment, a third sealing gasket 12 is provided between the lower end face of the outer sheath 1 and the base 8; a fourth sealing gasket 13 is provided between the lower end face of the outer pressure cover 14 and the base 8; and a fifth sealing gasket 15 is provided between the outer pressure cover 14 and the outer sheath 1.

[0056] Understandably, by setting up multiple end-face static seals on the basis of overall plastic seal, a redundant sealing system can be formed, which is beneficial to further improve the sealing reliability of the composite structure isolation sleeve.

[0057] The installation process of this invention is as follows: Slide the base 8 tightly against the outer wall of the inner sheath 2 from top to bottom; Insert the first sealing gasket 9 into the sealing groove on the inner wall of the base 8; Install the second sealing gasket 10 and the inner pressure cover 11 from bottom to top to the lower end of the inner sheath 2, and then screw the inner pressure cover 11 onto the base 8. Several non-magnetic screws 5 are uniformly threaded around the base 8; Several independent non-magnetic blanks 6 are inserted sequentially through holes evenly distributed on their circumference and stacked layer by layer on the base 8; during the stacking process, blank retaining rings 7 are embedded in the blank layer mainly formed by several non-magnetic blanks 6. After stacking to the designed height, the pressure cap 4 is installed, and the predetermined pre-tightening torque is applied by tightening the non-magnetic nut 3, so that the entire stamping layer forms a pre-compressed and high-rigidity integral load-bearing cylinder. Slide the outer sheath 1 onto the middle sleeve from top to bottom, and install the third sealing gasket 12, the fourth sealing gasket 13 and the fifth sealing gasket 15; The outer cover 14 is used to press the outer sheath 1 onto the upper end of the base 8 and is connected to the base 8 by screws to complete the installation of the composite structure isolation sleeve.

[0058] In summary, the present invention adopts a "sandwich" type composite pressure-bearing structure. The inner sheath 2 and the outer sheath 1 mainly undertake the functions of sealing, corrosion protection and insulation, and transmit fluid pressure to the middle stamped layer. The stamped layer serves as the core load-bearing skeleton and provides the main mechanical strength and rigidity, so as to work with the inner sheath 2 and the outer sheath 1 to achieve high pressure bearing and complete sealing. This invention employs a split-type insulating sheet eddy current suppression technology. Specifically, it uses a large number of thin, insulated metal sheets stacked together to form the main load-bearing layer. This fundamentally destroys the conditions for the generation of macroscopic eddies through physical separation and electrical insulation, thereby achieving the technical effect of extremely low eddy current loss while using high-strength metal materials. This invention employs a bidirectional pressure-bearing and force transmission mechanism, clarifying the mechanical transmission paths (inner pressure transmitted to the outside, outer pressure transmitted to the inside) when the inner sheath 2 and outer sheath 1 are subjected to pressure in different directions. Both achieve force balance and support through the stamping layer, forming a stable and reliable bidirectional pressure-bearing system. This invention employs a built-in online leak detection system, specifically by integrating a leak detection hole for mounting a leak detection sensor 16 on the load-bearing base 8. This enables real-time, online monitoring of the integrity of the innermost sealing shield, which greatly improves the safety and maintainability of the composite structure isolation sleeve.

[0059] In addition, compared with composite material isolation sleeves, the present invention has the following significant advantages: This invention breaks through the bottleneck of material performance and achieves a balance between high strength and low eddy current. Specifically, the interlayer strength of existing composite material isolation sleeves depends on the resin matrix, which poses a risk of delamination and insufficient long-term pressure-bearing reliability. This invention introduces pre-tightened and mutually insulated metal lamination layers, with high-strength metal materials directly bearing the main structural load, providing compressive strength, creep resistance, and impact toughness far exceeding those of composite laminate structures. At the same time, the separate insulated lamination design ensures extremely low eddy current loss, successfully resolving the contradiction between the high eddy current of traditional metal isolation sleeves and the insufficient interlayer strength of composite material isolation sleeves. The high-temperature resistance and thermal stability are significantly improved. Specifically, the long-term operating temperature of existing composite material isolation sleeves is limited by the resin matrix and is usually below 300°C. In this invention, the inner sleeve 2 and the outer sleeve 1 are made of PEEK, and the core load-bearing structure is made of high-temperature resistant metal, which enables the entire isolation sleeve to adapt to more demanding high-temperature conditions and has a long-term temperature resistance of >250°C. The metal stamping layer also has better thermal expansion coefficient matching and dimensional stability than composite materials, which is beneficial to maintaining a constant magnetic circuit air gap under variable temperature conditions. The sealing reliability and safety are greatly enhanced. Specifically, the present invention adopts a redundant sealing system of "integral plastic seal + multi-face static seal". The inner sheath 2 and the outer sheath 1 serve as a defect-free integral barrier, with higher reliability than composite material laminate structures that may have manufacturing defects. The integrated online leak detection function provides an active safety monitoring method, which can detect the failure of the inner and outer barriers in time and prevent problems before they occur. This is something that existing technologies generally do not have. It has superior mechanical properties and long-term reliability; specifically, the overall structure formed by the metal lamination layer under preload has high rigidity and small deformation, which can effectively ensure the stability of the air gap of the magnetic coupling, thereby improving transmission efficiency and service life; its fatigue resistance and stress relaxation resistance are also better than those of resin-based composite materials. The overall cost-performance ratio is more promising; although the structure is slightly complex, the main load-bearing components can be made of stamped stainless steel sheets, and the manufacturing process is mature; compared with expensive Hastelloy integral parts, precision engineering ceramic parts or high-performance carbon fiber composite parts, this solution has lower material costs and more controllable manufacturing risks while achieving the same or even better performance, and the cost-effectiveness throughout the entire life cycle is significant.

[0060] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A composite structural isolator, characterized by, include: Inner sheath (2), wherein the inner sheath (2) is a polyetheretherketone sheath; The intermediate sleeve includes a plurality of non-magnetic sheets (6) stacked sequentially along the axial direction, with insulation between adjacent non-magnetic sheets (6), and the inner wall of all non-magnetic sheets (6) is in contact with the outer wall of the inner sleeve (2). The outer sheath (1) is a polyether ether ketone sheath, and the inner wall of the outer sheath (1) is attached to the outer wall of all the non-magnetic stamps (6).

2. A composite structural isolator sleeve as in claim 1, wherein, The intermediate sleeve includes a base (8) fitted on the lower part of the inner sleeve (2), an upper pressure cap (4) fitted on the upper part of the inner sleeve (2), and a number of non-magnetic screws (5) axially passing through all the non-magnetic punches (6). The number of non-magnetic punches (6) is located between the base (8) and the upper pressure cap (4). One end of the non-magnetic screw (5) is detachably connected to the base (8), and the other end of the non-magnetic screw (5) passes through the upper pressure cap (4) and is threaded with a non-magnetic nut (3).

3. A composite structural isolator sleeve as in claim 2, wherein, The intermediate sleeve includes a lamination retaining ring (7) for providing an axial positioning reference. The lamination retaining ring (7) is embedded between two non-magnetic laminations (6). The inner wall and outer wall of the lamination retaining ring (7) are respectively attached to the outer wall of the inner sleeve (2) and the inner wall of the outer sleeve (1). A plurality of non-magnetic screws (5) pass through the lamination retaining ring (7).

4. A composite structural isolator sleeve according to claim 2 or 3, wherein, The non-magnetic punch (6) is uniformly perforated with several non-magnetic screws (5) along the circumference.

5. The composite structural isolator sleeve of claim 2, wherein, One end of the non-magnetic screw (5) is threaded onto the base (8).

6. A composite structural isolator sleeve as in claim 2, wherein, The lower end of the base (8) is detachably connected to an inner pressure cover (11). The base (8) presses down on the inner sleeve (2) from top to bottom, and the inner pressure cover (11) presses down on the inner sleeve (2) from bottom to top.

7. A composite structural isolator sleeve as in claim 6, wherein, A first sealing gasket (9) is provided between the base (8) and the inner sheath (2); a second sealing gasket (10) is provided between the inner pressure cover (11) and the inner sheath (2).

8. A composite structural isolator sleeve as in claim 7, wherein, The base (8) is provided with a leak detection hole that runs through the inside and outside. The outer end of the leak detection hole is used to install a leak detection sensor (16), and the inner end of the leak detection hole is located above the first sealing gasket (9).

9. A composite structural isolator sleeve according to claim 2, wherein, The upper end of the base (8) is detachably connected to an outer pressure cover (14). The base (8) presses the outer sheath (1) from bottom to top, and the outer pressure cover (14) presses the outer sheath (1) from top to bottom.

10. A composite structural isolator sleeve according to claim 9, wherein, A third sealing gasket (12) is provided between the lower end face of the outer sheath (1) and the base (8); and / or A fourth sealing gasket (13) is provided between the lower end face of the outer pressure cap (14) and the base (8); and / or A fifth sealing gasket (15) is provided between the outer pressure cover (14) and the outer sheath (1).

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