A CO2 ball valve with integrated detachable insulation system

Abstract

The application discloses a CO2 ball valve integrated with a detachable heat preservation system and belongs to the technical field of valves. The ball valve comprises a valve body, detachable upper and lower valve covers, a double-valve core assembly and a mortise joint type heat preservation sleeve and the like. The heat preservation sleeve is composed of two left and right halves which are spliced through a mortise joint structure and is detachably wrapped outside the valve body and the valve cover. A plurality of functional composite heat insulation layers are arranged in the heat preservation sleeve, which effectively guarantee the heat preservation and sealing performance of the valve under low-temperature working conditions. Flange structures are arranged on the upper and lower end surfaces of the valve body, and the valve body is fastened and connected with the upper and lower valve covers through bolt assemblies, so that the maintenance and replacement of internal components are facilitated. The valve core assembly is composed of a wear-resistant metal base and a corrosion-resistant non-metal lining pipe, and high pressure strength and corrosion resistance are taken into account. The upper and lower valve cores can be independently adjusted, so that the change of the total flow area is more gentle, fine adjustment of the CO2 flow is facilitated, and the ball valve is easy to maintain and replace, and the sealing reliability, maintenance convenience and adjustment performance of the ball valve under low-temperature high-pressure CO2 working conditions are improved as a whole.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and more specifically, relates to a ball valve for liquid CO2 conveying pipelines, and more particularly to a CO2 ball valve with an integrated detachable insulation system. Background Technology

[0002] In scenarios such as carbon capture, utilization, and storage (CCUS) and industrial CO2 transportation, liquid CO2 typically needs to be transported over long distances through pipelines in environments with low temperatures (approximately -20°C to -55°C), high pressures (approximately 2.0 MPa to 3.5 MPa), and highly corrosive media. As a key shut-off and regulating device in pipeline systems, ball valves require a systematic approach to address multiple technical challenges, including insulation, sealing, wear and corrosion resistance, and ease of maintenance.

[0003] The main shortcomings of existing ball valves are as follows: First, the insulation performance is significantly affected by low-temperature deformation. Traditional ball valves often use an integral or simple spliced ​​structure for their external insulation sleeves. Under low-temperature conditions, due to differences in material shrinkage rates, gaps easily form at the contact surface between the insulation sleeve and the valve body, resulting in a significant thermal bridging effect. This leads to cold loss and a decrease in insulation performance. In severe cases, condensation or ice formation may occur on the outer surface, affecting the safe operation of the equipment.

[0004] Secondly, maintenance is inconvenient and costly. Conventional integral ball valves use an inseparable integral structure. Once critical components such as the internal valve core are damaged, the entire valve needs to be disassembled from the pipeline for replacement. The maintenance process is complex, time-consuming, and costly. In addition, the pipeline insulation layer needs to be damaged at the same time, further increasing the workload of maintenance.

[0005] Third, it is difficult to balance strength and corrosion resistance in valve core materials. While single-metal materials have good wear resistance and impact resistance, their corrosion resistance is limited in acidic CO2 media environments. Although non-metallic materials are corrosion resistant, their brittleness makes their structural reliability insufficient under high impact pressure, making it difficult to simultaneously meet the dual requirements of high pressure strength and corrosion resistance.

[0006] Fourth, lubrication failure under low-temperature conditions. Although the dual-valve-core structure can improve the sealing level, the performance of conventional lubricants deteriorates under low-temperature conditions, which can easily cause the valve core to be in a state of dry friction or boundary lubrication, resulting in an increase in the coefficient of friction, an increase in operating torque, and accelerated wear of the sealing surface.

[0007] Fifth, existing technological improvements focus primarily on optimizing single functions, lacking a system integration design approach and failing to synergistically integrate technical requirements such as high-efficiency insulation, long-lasting sealing, wear and corrosion resistance, and convenient maintenance.

[0008] Therefore, providing a CO2 ball valve that can comprehensively solve the above-mentioned technical problems is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a CO2 ball valve with an integrated detachable insulation system that is structurally reasonable, reliably insulated, easy to assemble and disassemble, has stable sealing, and excellent wear and corrosion resistance. It aims to overcome the shortcomings of the prior art, such as the influence of low-temperature deformation on insulation performance, inconvenient maintenance, difficulty in balancing strength and corrosion resistance of valve core materials, low-temperature lubrication failure, and lack of system integration for functional optimization.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: a CO2 ball valve with an integrated detachable insulation system, comprising a valve body, an upper valve cover detachably connected to the upper end of the valve body, a lower valve cover detachably connected to the lower end of the valve body, a valve core assembly disposed inside the valve body, and an insulation sleeve (11) covering the outside of the valve body; the valve body has a sealing cavity inside and a fluid channel penetrating both ends, and the upper and lower end faces of the valve body are respectively provided with flange structures that cooperate with the upper valve cover and the lower valve cover; the insulation sleeve is entirely covered by the valve body, the upper valve cover and the lower valve cover, and is formed by the left and right insulation sleeves being tenoned together. The structure is assembled, and an elastic sealing strip is provided in the fitting gap of the tenon structure; the valve core assembly includes a valve core body composed of an upper valve core and a lower valve core, and an upper valve core liner and a lower valve core liner respectively disposed inside the upper valve core and the lower valve core. The upper valve core and the lower valve core are symmetrically arranged in the sealing cavity of the valve body; the upper valve core is connected to an upper valve stem, and the lower valve core is connected to a lower valve stem. The upper valve stem and the lower valve stem are respectively connected to an independent upper drive mechanism and a lower drive mechanism to drive the upper valve core and the lower valve core to rotate independently, so that two independent adjustable throttling windows are formed between the flow holes of the two valve cores and the fluid channel.

[0011] Preferably, the insulation jacket is a multi-layer functional composite system, including: an outer corrosion-resistant and impact-resistant protective shell; a middle layer of vacuum insulation board and low thermal conductivity porous material composite core; and an inner layer of flexible metal foil reinforced composite material.

[0012] Preferably, the tenon structure includes a dovetail tenon and a tongue and groove tenon; wherein the dovetail tenon is provided in the port area of ​​the insulation sleeve near the external pipe or valve cover, and the tongue and groove tenon is provided in the remaining mating areas of the insulation sleeve.

[0013] Preferably, the bodies of the upper valve core (31) and the lower valve core (32) are made of wear-resistant metal, and the upper valve core liner (41) and the lower valve core liner (42) are made of corrosion-resistant non-metallic material. Both the upper valve core liner and the lower valve core liner have thickened sections at their outer ends. The outer surface of the thickened section is machined into an arc surface that matches the outer spherical surface of the corresponding valve core body, smoothly transitioning with the valve core body to form a complete and corrosion-resistant spherical sealing working surface.

[0014] Preferably, the upper valve core liner and the lower valve core liner are fixed to the corresponding upper valve core and lower valve core by means of bonding, mechanical interlocking or a combination of both; the mechanical interlocking means include blind hole riveting, heat fitting or interference fit.

[0015] Preferably, both the upper valve core and the lower valve core are approximately hemispherical, arranged in a mirror image with the axis of symmetry of the fluid channel as the axis of symmetry, and the rotation axis of the upper valve core coincides with the rotation axis of the lower valve core.

[0016] Preferably, when the CO2 ball valve is fully open, the central axis of the flow hole formed by the upper valve core and the upper valve core liner is parallel to the central axis of the flow hole formed by the lower valve core and the lower valve core liner, and both are parallel to the axis of the fluid channel.

[0017] Preferably, a plurality of circumferentially symmetrically distributed blind holes are respectively opened on the end faces of the upper valve core and the lower valve core, and the blind holes are filled with solid lubricating material for reducing friction under low temperature conditions.

[0018] Preferably, the valve body's sealing cavity is further provided with a left sealing ring and a right sealing ring. The left and right sealing rings are respectively located on the left and right sides of the valve core assembly. The inner spherical surfaces of the two sealing rings are tightly fitted with the spherical sealing working surfaces on both sides of the valve core assembly, and adaptively press the valve core assembly under the action of medium pressure to form a floating sealing structure.

[0019] Preferably, a first dynamic sealing assembly is provided between the upper valve stem and the upper valve cover, and a second dynamic sealing assembly is provided between the lower valve stem and the lower valve cover; the dynamic sealing assembly includes packing material filled in the installation gap, and a packing compression sleeve for pressing the packing material.

[0020] The present invention has the following advantages due to the adoption of the above technical solutions: 1. This invention adopts a tenon-and-mortise type detachable insulation sleeve. Through the combination design of tongue and groove tenon and dovetail tenon, the insulation sleeve can still fit tightly against the valve body surface under low temperature conditions, effectively avoiding the thermal bridge effect caused by material shrinkage. Combined with a multi-layer functional composite thermal insulation system (outer protective shell, middle layer vacuum insulation board and porous material composite core, inner layer metal foil reinforced composite material layer), the thermal insulation effect is significantly improved, ensuring the cold capacity is maintained under low temperature transportation conditions.

[0021] 2. This invention adopts a modular design, with the detachable tenon-jointed insulation sleeve, the flange-connected detachable valve cover, and the split valve core assembly being independent and separable. Maintenance does not require damaging the pipeline insulation layer; only the insulation sleeve needs to be removed to detach the valve cover, allowing for the inspection or replacement of the internal valve core assembly. This achieves rapid, localized maintenance, significantly reducing maintenance costs and downtime.

[0022] 3. This invention adopts a composite structure of wear-resistant metal matrix and corrosion-resistant non-metallic liner. The valve core body is made of wear-resistant metal to withstand high pressure mechanical loads, and the inner side is embedded with corrosion-resistant non-metallic liner to resist chemical corrosion by CO2 medium. The two work together to significantly improve corrosion resistance while ensuring structural strength and extending the service life of the valve.

[0023] 4. This invention adopts a symmetrical arrangement of two valve cores, combined with a floating sealing structure of left and right sealing rings, which adaptively tightens under medium pressure to form multiple sealing guarantees; at the same time, packing dynamic sealing components are provided at the upper and lower valve stems to ensure reliable dynamic sealing between the valve stem and the valve cover, effectively preventing medium leakage.

[0024] 5. The present invention adopts an independent dual-drive mechanism, which can independently control the rotation angle of the upper valve core and the lower valve core, so that the flow holes of the two valve cores and the fluid channel form two independently adjustable throttling windows, making the change of the total flow area more gradual, which is conducive to achieving fine adjustment of CO2 flow rate.

[0025] 6. The present invention provides blind holes filled with solid lubricating material on the opposite end faces of the upper and lower valve cores. By utilizing the stable lubrication performance of solid lubricating material under low temperature conditions, the friction coefficient and operating torque during the relative movement of the valve cores are effectively reduced, making the valve opening and closing smoother. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of the CO2 ball valve provided in an embodiment of the present invention; Figure 2 This is an exploded view of the tenon-jointed valve body insulation sleeve provided in an embodiment of the present invention; Figure 3 It is a cross-sectional view along the tenon joint surface of the valve body insulation sleeve; Figure 4 This is a schematic diagram highlighting the connection structure between the valve body, valve cover, and valve stem in this invention; Figure 5 yes Figure 4A bottom view; Figure 6 This is an overall sectional view of the CO2 ball valve provided in this embodiment of the invention along the fluid channel axis; Figure 7 This is an exploded schematic diagram of the valve core and valve core liner provided in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the valve core assembly provided in an embodiment of the present invention; Figure 9 This is a bottom view of the valve core assembly provided in an embodiment of the present invention.

[0027] The labels for the attached figures are as follows: 1-Valve body; 11-Valve body insulation sleeve; 111-Left insulation sleeve; 112-Right insulation sleeve; 12-Blind hole; 13-Dovetail tenon; 14-Ribbon tenon; 15-Fluid passage; 21-Left sealing ring; 22-Right sealing ring; 31-Upper valve core; 32-Lower valve core; 41-Upper valve core liner; 42-Lower valve core liner; 51-Upper valve stem; 52-Lower valve stem; 53-Upper drive mechanism; 54-Lower drive mechanism; 61-Upper valve cover; 62-Lower valve cover; 7-Bolt; 71-First Bolt; 72-Second bolt; 73-Third bolt; 74-Fourth bolt; 75-Fifth bolt; 76-Sixth bolt; 77-Seventh bolt; 78-Eighth bolt; 8-Nut; 81-First nut; 82-Second nut; 83-Third nut; 84-Fourth nut; 85-Fifth nut; 86-Sixth nut; 87-Seventh nut; 88-Eighth nut; 91-Upper packing; 92-Lower packing; 101-Upper packing compression sleeve; 102-Lower packing compression sleeve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The CO2 ball valve with an integrated detachable insulation system provided by this invention includes a valve body, detachable upper and lower valve covers, a dual valve core assembly, and a tenon-jointed insulation sleeve. The insulation sleeve is composed of two halves joined together by a tenon-joint structure and is detachably wrapped around the valve body and valve cover. It has a multi-layered functional composite insulation layer inside, effectively ensuring the valve's insulation and sealing performance under low-temperature conditions. The upper and lower end faces of the valve body are respectively equipped with flange structures, which are fastened to the upper and lower valve covers by bolt assemblies, facilitating the maintenance and replacement of internal components. The valve core assembly is made of a wear-resistant metal matrix and a corrosion-resistant non-metallic liner, balancing high-pressure strength and corrosion resistance. The upper and lower valve cores can be adjusted independently, resulting in a smoother change in the total flow area, which is beneficial for fine adjustment of CO2 flow rate and easy replacement and maintenance. Overall, it improves the sealing reliability, maintenance convenience, and adjustment performance of the ball valve under low-temperature, high-pressure CO2 conditions.

[0035] The CO2 ball valve with an integrated detachable insulation system provided in the embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] Please see Figure 1 , Figure 4 , Figure 5 and Figure 6 The present invention provides a CO2 ball valve with an integrated detachable insulation system, which mainly includes a valve body 1, an upper valve cover 61, a lower valve cover 62, a valve core assembly and a sealing assembly disposed inside the valve body 1, a valve stem and a dynamic sealing structure that are connected to the valve core assembly, and a valve body insulation sleeve 11 that is detachably covered outside the valve body 1.

[0037] Please see Figure 2 and Figure 3The valve body insulation sleeve 11 completely encloses the valve body 1, upper valve cover 61, and lower valve cover 62, and is assembled from the left insulation sleeve 111 and the right insulation sleeve 112 through a tenon joint structure. The valve body insulation sleeve 11 adopts a multi-layer functional composite system: the outer layer is a corrosion-resistant and impact-resistant protective shell, providing mechanical protection; the middle layer is a heat-insulating core material composed of a vacuum insulation board and a low thermal conductivity porous material, providing core heat insulation performance; the inner layer is a flexible metal foil reinforced composite material layer, which has heat reflection function, ensuring close contact with the surface of the valve body 1 and reducing radiative heat transfer. Elastic sealing strips are embedded in the mating gaps of the tenon joint structure to eliminate joint gaps and ensure the overall sealing of the insulation sleeve itself.

[0038] The tenon and mortise structure includes dovetail tenons 13 and tongue and groove tenons 14. Specifically, dovetail tenons 13 are provided in the port area of ​​the valve body insulation sleeve 11 near the external pipe or valve cover, utilizing their excellent pull-out resistance and self-locking characteristics to ensure the tightness and overall stability of the connection in the port area under complex working conditions. Tongue and groove tenons 14 are provided in the remaining mating areas of the valve body insulation sleeve 11. This structure is easy to process, quick to assemble, and has good circumferential positioning accuracy, achieving efficiency and economy in large-area splicing. The combined application of tongue and groove tenons 14 and dovetail tenons 13 balances the structural strength, sealing reliability, and ease of on-site assembly and disassembly of the entire valve body insulation sleeve 11.

[0039] Please see Figures 4 to 6 The valve body 1 is integrally cast or forged, and its interior forms a sealed cavity to accommodate the valve core assembly. A horizontal fluid channel 15 is machined through its left and right ends. Flange structures are provided on the upper and lower ends of the valve body 1. The upper valve cover 61 and lower valve cover 62 are fastened to the flange structures at the upper and lower ends of the valve body 1 by bolts 7 and nuts 8. Specifically, the upper valve cover 61 is fastened to the flange structure at the upper end of the valve body 1 by first bolts 71, second bolts 72, third bolts 73, and fourth bolts 74 and corresponding first nuts 81, second nuts 82, third nuts 83, and fourth nuts 84. The lower valve cover 62 is fastened to the flange structure at the lower end of the valve body 1 by fifth bolts 75, sixth bolts 76, seventh bolts 77, and eighth bolts 78 and corresponding fifth nuts 85, sixth nuts 86, seventh nuts 87, and eighth nuts 88, thereby sealing the sealed cavity of the valve body 1. This flange connection structure facilitates disassembly for the installation and maintenance of internal parts of the ball valve.

[0040] Please see Figures 6 to 8The valve core assembly includes a valve core body composed of an upper valve core 31 and a lower valve core 32, and upper valve core liners 41 and 42 respectively disposed inside the upper valve core 31 and lower valve core 32. The upper valve core 31 and lower valve core 32 are symmetrically arranged in the sealing cavity of the valve body 1. Both the upper valve core 31 and lower valve core 32 are approximately hemispherical and arranged in a mirror image with the axis of symmetry of the fluid channel 15 as the axis of symmetry, with their rotation axes coinciding. The bodies of the upper valve core 31 and lower valve core 32 are made of wear-resistant metal (such as stainless steel) to withstand mechanical loads under high pressure. Upper valve core liners 41 and 42, made of corrosion-resistant non-metallic materials (such as ceramics), are respectively embedded inside the upper valve core 31 and lower valve core 32 to prevent corrosion by the CO2 medium. Both the upper valve core liner 41 and the lower valve core liner 42 have thickened sections at their outer ends. The outer surface of the thickened section is machined into an arc surface that matches the outer spherical surface of the valve core body, achieving a smooth transition with the valve core body and forming a complete, corrosion-resistant spherical sealing working surface.

[0041] The upper valve core liner 41 and the lower valve core liner 42 are fixed to the corresponding upper valve core 31 and lower valve core 32 by bonding, mechanical interlocking or a combination of the two. The mechanical interlocking methods include blind hole riveting, heat fitting or interference fit.

[0042] When the CO2 ball valve is fully open, the central axis of the flow hole formed by the upper valve core 31 and the upper valve core liner 41 is parallel to the central axis of the flow hole formed by the lower valve core 32 and the lower valve core liner 42, and both are parallel to the axis of the fluid channel 15.

[0043] The valve body 1 also has a left sealing ring 21 and a right sealing ring 22 within its sealing cavity. The left sealing ring 21 is located on the left side of the valve core assembly, and the right sealing ring 22 is located on the right side of the valve core assembly. The inner spherical surfaces of the two sealing rings are tightly fitted with the spherical sealing working surfaces on both sides of the valve core assembly, and adaptively press the valve core assembly under medium pressure, forming a floating sealing structure to achieve a reliable sealing effect. Please refer to [link / reference]. Figure 9 To further optimize the valve core's actuation performance, multiple circumferentially symmetrically distributed blind holes 12 are machined on the opposite end faces of the upper valve core 31 and the lower valve core 32, and solid lubricating material (such as PTFE-based composite material) is filled in the holes to provide lubrication for the relative movement of the upper valve core 31 and the lower valve core 32, thereby reducing the operating torque and wear under low temperature conditions.

[0044] Please see Figure 6 and Figure 8 Both the upper valve core 31 and the lower valve core 32 are provided with transmission slots. The lower end of the upper valve rod 51 is engaged with the transmission slot of the upper valve core 31, and the upper end of the upper valve rod 51 passes through the upper valve cover 61. The upper end of the lower valve rod 52 is engaged with the transmission slot of the lower valve core 32, and the lower end of the lower valve rod 52 passes through the lower valve cover 62.

[0045] Please see Figure 1 , Figure 4 , Figure 5 and Figure 6 Both the upper valve stem 51 and the lower valve stem 52 are connected to independent upper drive mechanisms 53 and lower drive mechanisms 54. The upper drive mechanism 53 independently drives the upper valve stem 51 to rotate, thereby causing the upper valve core 31, which engages with it through a transmission slot, to rotate synchronously. The lower drive mechanism 54 independently drives the lower valve stem 52 to rotate, thereby causing the lower valve core 32, which engages with it through a transmission slot, to rotate synchronously. The upper drive mechanism 53 and lower drive mechanism 54 can be driven by a manual operating device (such as a handle) or powered by an electric or pneumatic device. This configuration allows for precise flow control of the ball valve. During operation, the rotation angle of the upper valve core 31 or the lower valve core 32 can be adjusted individually, or both can be adjusted simultaneously. When adjusting the flow rate, the upper drive mechanism 53 and lower drive mechanism 54 drive the upper valve core 31 and the lower valve core 32 respectively, forming two independently variable throttling windows between their flow orifices and the fluid channel 15. This results in a smoother change in the total flow area, which is beneficial for precise adjustment of the CO2 flow rate. Please refer to [link to relevant documentation]. Figure 6 A dynamic sealing assembly is provided between the valve stem assembly and the valve cover to prevent media leakage along the valve stem. A first dynamic sealing assembly is formed between the upper valve cover 61 and the upper valve stem 51, including upper packing 91 filled in their installation gap and an upper packing compression sleeve 101 for pressing the upper packing 91. A second dynamic sealing assembly is formed between the lower valve cover 62 and the lower valve stem 52, including lower packing 92 filled in their installation gap and a lower packing compression sleeve 102 for pressing the lower packing 92. The upper packing compression sleeve 101 and the lower packing compression sleeve 102 are threadedly connected to the upper valve cover 61 and the lower valve cover 62 respectively to maintain the necessary compression of the packing and ensure a long-term reliable dynamic seal.

[0046] In summary, the CO2 ball valve with an integrated detachable insulation system provided by this invention integrates multiple technical features through an integrated design, including a tenon-jointed detachable insulation sleeve, a flange-connected detachable valve cover, a metal-non-metal composite valve core, an independent dual-drive mechanism, and a solid lubrication friction-reducing structure. This system collaboratively solves problems in existing technologies such as insulation performance being affected by low-temperature deformation, inconvenient maintenance, difficulty in balancing strength and corrosion resistance in valve core materials, low-temperature lubrication failure, and a lack of system integration for functional optimization. It boasts outstanding advantages such as reliable insulation, convenient maintenance, stable sealing, strong corrosion resistance, more precise flow regulation, and smooth opening and closing at low temperatures. It is suitable for the cut-off and regulation conditions of liquid CO2 conveying pipelines and has good practical value and promising prospects for widespread application.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A CO2 ball valve with an integrated detachable insulation system, characterized in that, It includes a valve body (1), an upper valve cover (61) detachably connected to the upper end of the valve body (1), a lower valve cover (62) detachably connected to the lower end of the valve body (1), a valve core assembly disposed inside the valve body (1), and a heat insulation sleeve (11) covering the outside of the valve body (1). The valve body (1) has a sealed cavity inside and a fluid channel (15) that runs through both ends. The upper and lower end faces of the valve body (1) are respectively provided with flange structures that cooperate with the upper valve cover (61) and the lower valve cover (62). The insulation sleeve (11) is entirely covered by the valve body (1), the upper valve cover (61) and the lower valve cover (62). It is formed by the left insulation sleeve (111) and the right insulation sleeve (112) being joined together by a tenon joint structure, and an elastic sealing strip is provided in the fitting gap of the tenon joint structure. The valve core assembly includes a valve core body composed of an upper valve core (31) and a lower valve core (32), and an upper valve core liner (41) and a lower valve core liner (42) respectively disposed inside the upper valve core (31) and the lower valve core (32). The upper valve core (31) and the lower valve core (32) are symmetrically disposed in the sealing cavity of the valve body (1). The upper valve core (31) is connected to the upper valve stem (51), and the lower valve core (32) is connected to the lower valve stem (52). The upper valve stem (51) and the lower valve stem (52) are respectively connected to an independent upper drive mechanism (53) and a lower drive mechanism (54) to drive the upper valve core (31) and the lower valve core (32) to rotate independently, so that the flow holes of the two valve cores form two independent adjustable throttling windows between them and the fluid channel (15).

2. The CO2 ball valve according to claim 1, characterized in that, The insulation sleeve (11) is a multi-layer functional composite system, including: an outer corrosion-resistant and impact-resistant protective shell; a middle layer of vacuum insulation board and low thermal conductivity porous material composite core; and an inner layer of flexible metal foil reinforced composite material layer.

3. The CO2 ball valve according to claim 2, characterized in that, The tenon structure includes a dovetail tenon (13) and a tongue and groove tenon (14); wherein the dovetail tenon (13) is provided in the port area of ​​the insulation sleeve (11) near the external pipe or valve cover, and the tongue and groove tenon (14) is provided in the remaining mating areas of the insulation sleeve (11).

4. The CO2 ball valve according to claim 1, characterized in that, The bodies of the upper valve core (31) and the lower valve core (32) are made of wear-resistant metal, and the upper valve core liner (41) and the lower valve core liner (42) are made of corrosion-resistant non-metallic materials. The outer ends of the upper valve core liner (41) and the lower valve core liner (42) are provided with thickened sections. The outer surface of the thickened section is machined into an arc surface that matches the outer spherical surface of the corresponding valve core body, and smoothly transitions with the valve core body to form a complete and corrosion-resistant spherical sealing working surface.

5. The CO2 ball valve according to claim 4, characterized in that, The upper valve core liner (41) and the lower valve core liner (42) are respectively fixed to the corresponding upper valve core (31) and lower valve core (32) by bonding, mechanical interlocking or a combination of the two; the mechanical interlocking methods include blind hole riveting, heat fitting or interference fit.

6. The CO2 ball valve according to claim 1, characterized in that, The upper valve core (31) and the lower valve core (32) are both approximately hemispherical and are arranged in a mirror image with the axis of symmetry of the fluid channel (15). The rotation axis of the upper valve core (31) coincides with the rotation axis of the lower valve core (32).

7. The CO2 ball valve according to claim 1, characterized in that, When the CO2 ball valve is fully open, the central axis of the flow hole formed by the upper valve core (31) and the upper valve core liner (41) is parallel to the central axis of the flow hole formed by the lower valve core (32) and the lower valve core liner (42), and both are parallel to the axis of the fluid channel (15).

8. The CO2 ball valve according to claim 1, characterized in that, Multiple circumferentially symmetrically distributed blind holes (12) are respectively opened on the end faces of the upper valve core (31) and the lower valve core (32), and the blind holes (12) are filled with solid lubricating material for reducing friction under low temperature conditions.

9. The CO2 ball valve according to claim 1, characterized in that, The valve body (1) is also provided with a left sealing ring (21) and a right sealing ring (22) in the sealing cavity. The left sealing ring (21) and the right sealing ring (22) are respectively located on the left and right sides of the valve core assembly. The inner spherical surfaces of the two sealing rings are tightly fitted with the spherical sealing working surfaces on both sides of the valve core assembly, and adaptively press the valve core assembly under the action of medium pressure to form a floating sealing structure.

10. The CO2 ball valve according to claim 1, characterized in that, A first dynamic sealing assembly is provided between the upper valve stem (51) and the upper valve cover (61), and a second dynamic sealing assembly is provided between the lower valve stem (52) and the lower valve cover (62); the dynamic sealing assembly includes packing material filled in the installation gap, and a packing compression sleeve for pressing the packing material.

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