A self-cooling mechanical seal device for high-temperature pumps

Abstract

This invention discloses a self-cooling mechanical seal device for high-temperature pumps, comprising a pump shaft, with an impeller, a rotating ring assembly, a stationary ring assembly, a heat dissipation module, and a cooling fan arranged coaxially along the pump shaft axis. The rotating ring assembly rotates synchronously with the pump shaft, and the rotating ring assembly and stationary ring assembly cooperate to form a sealing end face. The stationary ring assembly is fixedly installed, and the side of the stationary ring assembly facing away from the sealing end face is tightly connected to the heat dissipation module. A high thermal conductivity filler layer is provided between the stationary ring assembly and the heat dissipation module. Radially extending heat dissipation fins are integrally formed on the radially outer surface of the heat dissipation module. A heat insulation sleeve is provided between the heat dissipation module and the pump shaft. The cooling fan is fixedly installed on the pump shaft and located axially outside the heat dissipation module. This invention achieves integration without external cooling medium and power, enabling efficient active self-cooling and significantly improving the reliability and lifespan of the mechanical seal under high-temperature conditions.

Description

Technical Field

[0001] This invention belongs to the field of pump cooling, specifically a self-cooling mechanical seal device for high-temperature pumps. Background Technology

[0002] During operation, high-temperature pumps transport media with temperatures reaching hundreds of degrees Celsius. The dynamic and static rings of the mechanical seal generate significant frictional heat under high pressure and high-speed relative rotation. Simultaneously, the high-temperature medium within the pump continuously conducts heat to the sealing cavity. If this heat cannot be dissipated promptly and effectively, it will cause the liquid film between the sealing surfaces to vaporize, leading to dry friction, resulting in end-face burning and rapid wear. Furthermore, high temperatures can cause auxiliary sealing rings, such as O-rings, to age and fail, as well as thermal deformation of the sealing rings, ultimately leading to seal leakage and severely impacting the pump's operational reliability and safety.

[0003] A search revealed that Chinese invention patent CN117212247A discloses a high-temperature pump cooling device, which employs a combination of water-cooled multiple independent parallel serpentine heat dissipation pipes and air cooling, and features a complex reflux liquid cooling mechanism and air duct to achieve efficient heat dissipation. However, its system is extremely complex, including numerous external pipes, independent fans, and heat dissipation housings, requiring a significant amount of additional space. This results in high manufacturing and maintenance costs, and its cooling efficiency still relies on a continuous supply of externally circulating cooling media (water and air), failing to fundamentally change its dependence on an external cooling system.

[0004] In summary, the existing cooling technologies for high-temperature pump mechanical seals, whether simple jacket cooling or complex composite cooling systems, all share the following common problems: (1) Dependence on external systems: additional cooling medium water or oil supply pipelines, circulating power source pumps, fans or heat dissipation ducts are required, making the system complex and increasing the number of failure points; (2) Non-integrated structure: the cooling components are separated from the seal body, resulting in a non-compact structure, large space occupation, and a long heat conduction path from the heat source to the radiator with high thermal resistance; (3) High operating energy consumption: the external circulation system itself requires additional electrical or mechanical energy.

[0005] Therefore, there is an urgent need for a new type of mechanical seal cooling device that is highly integrated in structure, does not rely on external cooling media and power, and can achieve efficient heat dissipation by utilizing the pump's own operating conditions, so as to fundamentally simplify the system, improve reliability and reduce energy consumption. Summary of the Invention

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A self-cooling mechanical seal device for a high-temperature pump includes a pump shaft. An impeller, a rotating ring assembly, a stationary ring assembly, a heat dissipation module, and a cooling fan are coaxially arranged along the pump shaft axis. The rotating ring assembly rotates synchronously with the pump shaft. The rotating ring assembly and the stationary ring assembly cooperate to form a sealing end face. The stationary ring assembly is fixedly installed. The side of the stationary ring assembly facing away from the sealing end face is tightly connected to the heat dissipation module. A high thermal conductivity filling layer is provided between the stationary ring assembly and the heat dissipation module. Radially extending heat dissipation fins are integrally formed on the radially outer surface of the heat dissipation module. A heat insulation sleeve is provided between the heat dissipation module and the pump shaft. The cooling fan is fixedly installed on the pump shaft and located axially outside the heat dissipation module. The cooling fan rotates synchronously with the pump shaft. An axial directional airflow gap is formed between the cooling fan and the heat dissipation fins, so that the axial airflow generated when the cooling fan rotates directly blows onto the heat dissipation fins and the surface of the heat dissipation module.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Achieves true "self-driven, zero external dependence" cooling: By directly fixing the cooling fan to the pump shaft and making it rotate synchronously with the pump shaft, the rotational mechanical energy of the pump shaft itself is directly converted into the kinetic energy to drive the cooling airflow. This design completely eliminates the dependence on external power sources, independent fans, cooling water pumps, and other additional power sources and external cooling medium circulation systems, simplifying the system from the root and significantly reducing the risk of seal failure due to external system malfunctions, resulting in extremely high operational reliability.

[0009] 2. An integrated, high-efficiency heat dissipation channel with ultra-short path and ultra-low thermal resistance was constructed: The heat dissipation module and the back of the stationary ring assembly are directly and tightly bonded through a high thermal conductivity filler layer, allowing the frictional and conductive heat generated at the sealed end face to be discharged along the shortest path, greatly reducing the conduction thermal resistance. The high thermal conductivity filler layer effectively eliminates the microscopic air gaps between mechanical contact surfaces, significantly reducing the interfacial contact thermal resistance. The one-piece radial heat dissipation fins on the heat dissipation module greatly increase the heat dissipation surface area. The high-speed axial directional airflow generated by the cooling fan driven by the pump shaft directly and efficiently sweeps the entire heat dissipation fin array, achieving forced and targeted convection heat transfer, with a heat dissipation efficiency far exceeding that of natural cooling or indirect air cooling.

[0010] 3. Active heat insulation is achieved, protecting critical components: The heat insulation sleeve installed between the heat dissipation module and the pump shaft forms an annular heat insulation cavity, which effectively blocks the heat dissipated from returning to the pump shaft and critical transmission components such as bearings at the rear end of the pump shaft. This forces heat to dissipate only along the designed forward path, protecting components such as bearings from high temperatures and further improving the dedicated cooling efficiency of the cooling system for the sealing end face, making cooling more targeted.

[0011] 3. Highly compact and integrated structure, with no additional space or energy burden: The entire cooling system and mechanical seal body are compactly integrated along the pump shaft axis, requiring no additional installation space, complex piping, or external enclosure. The system operates without consuming any additional electrical energy other than the kinetic energy of the pump shaft rotation, achieving highly efficient cooling with "zero additional energy consumption" and significant energy-saving effects.

[0012] 4. Improved overall lifespan and reliability of mechanical seals under high-temperature conditions: Through the above-mentioned efficient and active self-cooling mechanism, the temperature of the sealing end face can be maintained within a low safe operating range, thereby effectively preventing vaporization of the liquid film on the end face, reducing dry friction, delaying the aging and thermal deformation of the sealing ring and auxiliary sealing ring, fundamentally solving the problem of early seal failure caused by high temperature, and significantly extending the operating life and reliability of the sealing device and the entire pump. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the high-temperature pump in this invention.

[0014] Figure 2 This is a partial cross-sectional view of the high-temperature pump in this invention.

[0015] Figure 3 In this invention Figure 2 A magnified view of part A.

[0016] Figure 4 This is a front view of the high-temperature pump in this invention.

[0017] Figure 5 In this invention Figure 4 A magnified view of section B.

[0018] Figure 6 This is a schematic diagram of the cooling mechanical seal in this invention.

[0019] In the diagram, 1. Pump shaft; 2. Impeller; 3. Moving ring assembly; 4. Stationary ring assembly; 5. Heat dissipation module; 6. Cooling fan; 7. High thermal conductivity filler layer; 8. Heat dissipation fins; 9. Heat insulation sleeve; 10. Moving ring seat; 11. Moving ring; 12. Elastic compensation mechanism; 13. Stationary ring; 14. Stationary ring seat. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] 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," and "counterclockwise," 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 the present 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 the present invention.

[0022] 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] like Figures 1-6 As shown, a self-cooling mechanical seal device for a high-temperature pump according to the present invention includes a pump shaft 1. An impeller 2, a rotating ring assembly 3, a stationary ring assembly 4, a heat dissipation module 5, and a cooling fan 6 are arranged coaxially along the pump shaft 1. The rotating ring assembly 3 rotates synchronously with the pump shaft 1. The rotating ring assembly 3 and the stationary ring assembly 4 cooperate to form a sealing end face. The stationary ring assembly 4 is fixedly installed. The side of the stationary ring assembly 4 away from the sealing end face is tightly connected to the heat dissipation module 5. A high thermal conductivity filling layer 7 is provided between the stationary ring assembly 4 and the heat dissipation module 5. Radially extending heat dissipation fins 8 are integrally formed on the radial outer surface of the heat dissipation module 5. A heat insulation sleeve 9 is provided between the heat dissipation module 5 and the pump shaft 1. The cooling fan 6 is fixedly installed on the pump shaft 1 and located on the axial outer side of the heat dissipation module 5. The cooling fan 6 rotates synchronously with the pump shaft 1. An axial directional flow guide gap is formed between the cooling fan 6 and the heat dissipation fins 8 so that the axial airflow generated when the cooling fan 6 rotates directly blows onto the heat dissipation fins 8 and the surface of the heat dissipation module 5.

[0024] In this structure, when the high-temperature pump starts and runs, the device sequentially activates its efficient self-cooling working cycle: First, the dynamic ring assembly 3 and the stationary ring assembly 4 generate a large amount of frictional heat at the sealing end face due to high-speed relative motion and medium conduction; this heat is quickly captured by the stationary ring assembly 4, which is in close contact with it, and transferred to the high thermal conductivity filling layer 7 via its back end face. The high thermal conductivity filling layer 7, as a key interface material, greatly reduces the contact thermal resistance, allowing heat to be introduced into the heat dissipation module 5, which is pressed tightly against it, with almost no loss. The heat dissipation module 5, as the core heat sink, has heat dissipation fins 8 integrally formed on its radial outer surface, which diffuses heat over a large surface area. At the same time, the cooling fan 6, which rotates at high speed synchronously with the pump shaft 1, starts to work, and its rotation generates a strong and precisely directional axial cooling airflow. This airflow is directly guided through the axial directional flow gap formed between the cooling fan 6 and the heat dissipation fins 8 and passes through the axial ventilation channel between the heat dissipation fins 8, continuously and forcibly sweeping the surface of the heat dissipation fins 8 and the heat dissipation module 5, thereby efficiently carrying away and dissipating the accumulated heat into the surrounding environment. In addition, the heat insulation sleeve 9 set between the heat dissipation module 5 and the pump shaft 1 effectively blocks the return path of heat along the radial direction to the pump shaft 1, ensuring the directionality of heat flow and making the cooling efficiency completely concentrated in the sealing area, realizing active, efficient and self-sustaining cooling of the sealing pair.

[0025] In one embodiment, the heat dissipation module 5 is an annular sleeve structure. The inner ring of the heat dissipation module 5 is attached to the outer wall of the heat insulation sleeve 9. The end face of the heat dissipation module 5 and the back end face of the stationary ring assembly 4 are pressed and attached to the high thermal conductivity filling layer 7. The heat dissipation fins 8 extend along the entire axial length of the heat dissipation module 5 and are evenly distributed circumferentially.

[0026] In this structure, the annular sleeve design of the heat dissipation module 5 achieves deep synergy in structure, heat conduction, and heat dissipation. The inner ring's fit against the outer wall of the insulation sleeve 9 provides radial support and positioning, while the excellent thermal insulation properties of the insulation sleeve 9 create an effective thermal barrier, preventing heat from returning to the pump shaft 1. The end face of the heat dissipation module 5 and the back end face of the stationary ring assembly 4 are tightly pressed together by a high thermal conductivity filling layer 7. This pressing design, in conjunction with the high thermal conductivity filling layer 7 material, greatly eliminates microscopic gaps and thermal resistance between the contact interfaces. The heat dissipation fins 8, extending along the entire axial length of the heat dissipation module 5 and evenly distributed circumferentially, maximize the heat dissipation surface area. The evenly distributed array of heat dissipation fins 8 naturally forms multiple axial ventilation channels parallel to the axis. The direction of these channels is completely consistent with the axial cooling airflow generated by the cooling fan 6, ensuring that the airflow can be smoothly introduced and penetrate the entire heat dissipation area, thereby providing uniform and efficient forced convection cooling to the huge fin surface area, ultimately rapidly removing the accumulated heat. The entire design integrates the heat export, diffusion and dissipation processes into a compact module, achieving extremely high cooling efficiency and structural reliability.

[0027] In one embodiment, an axial ventilation channel is formed between adjacent heat dissipation fins 8, and the axial ventilation channel is in the same direction as the airflow output by the cooling fan 6, so that the airflow can pass through the entire length of the heat dissipation fins 8.

[0028] In this structure, the axial ventilation channels formed between adjacent heat dissipation fins 8, naturally formed by the regular arrangement of the fins, maintain a high degree of consistency with the axial cooling airflow direction output by the rotating cooling fan 6. This directional consistency ensures that the cooling airflow can be guided with low resistance, thus completely penetrating the entire axial length of the heat dissipation fins 8. As the airflow flows through these narrow and uniform channels, it makes full and continuous contact with all surfaces of the heat dissipation fins 8, efficiently carrying away the heat dissipated from the heat dissipation module 5. This not only maximizes the convective heat transfer area and efficiency but also avoids eddies, dead zones, or localized overheating that may occur due to mismatch between the airflow direction and the channels, resulting in a more uniform temperature distribution throughout the heat dissipation area and a complete release of cooling efficiency.

[0029] In one embodiment, the cooling fan 6 is an axial fan, the hub of the cooling fan 6 is interference-fitted with the pump shaft 1, the fan blades face the outer end face of the heat dissipation fins 8, and the axial flow guidance gap between the blades and the heat dissipation fins 8 is 5mm to 25mm.

[0030] In this structure, the cooling fan 6 adopts an axial fan design and is directly interference-fitted onto the pump shaft 1. The characteristics of an axial fan enable it to generate a high-flow, low-turbulence concentrated cooling airflow along the axis of the pump shaft 1 during rotation. The interference fit between its hub and the pump shaft 1 ensures absolute reliability of power transmission under high-speed rotation conditions. The fan blades are precisely positioned to face the outer end face of the heat sink fins 8, ensuring that the initial direction of the airflow generated by the fan is precisely guided to the core of the heat dissipation area. Crucially, the axial airflow clearance between the blades and the heat sink fins 8 is precisely set to 5mm to 25mm. This clearance range has been carefully optimized: if the clearance is too small, the high-speed rotating blade tips may pose a risk due to airflow disturbance or slight vibration between the blades and the static fins; if the clearance is too large, the airflow pressure generated by the fan will decrease, preventing it from effectively penetrating and driving the air in the flow channels between the heat sink fins 8. This perfectly spaced gap ensures operational safety while maximizing the scouring speed and heat exchange efficiency of the airflow on the fin surface with minimal diffusion loss and maximum dynamic pressure after leaving the fan blades, thus providing a powerful and stable active heat dissipation power source for the entire self-cooling system.

[0031] In one embodiment, the high thermal conductivity filler layer 7 is a graphite thermal pad, an aluminum nitride ceramic sheet, or a flexible metal thermal sheet, with a thickness of 0.2 mm to 1.5 mm, used to eliminate the contact thermal resistance between the static ring assembly 4 and the heat dissipation module 5.

[0032] In this structure, the high thermal conductivity filler layer 7 uses graphite thermal pads, aluminum nitride ceramic sheets, or flexible metal thermal sheets, based on their extremely high in-plane or bulk thermal conductivity, enabling rapid heat transfer with minimal temperature difference. Its precise thickness range of 0.2mm to 1.5mm is the result of rigorous engineering trade-offs: too thin a layer might fail to adequately compensate for the gaps caused by microscopic roughness and dimensional tolerances between the two metal end faces of the stationary ring assembly 4 and the heat dissipation module 5, weakening the filling effect; too thick a layer would unnecessarily increase the length of the heat conduction path, introducing additional bulk material thermal resistance. This filler layer is tightly pressed between the two components, replacing the contact points originally occupied by low thermal conductivity air with continuous channels of high thermal conductivity material, thereby reducing the significant contact thermal resistance to a negligible level. This not only ensures that heat from the sealed end face can be transferred to the heat dissipation module 5 almost without loss, but also alleviates localized overheating and thermal stress that may result from poor contact, ensuring the long-term stability and efficiency of the heat flow channel.

[0033] In one embodiment, the heat insulation sleeve 9 is made of aerogel composite material or glass fiber reinforced engineering ceramic, and the heat insulation sleeve 9 is sleeved between the pump shaft 1 and the heat dissipation module 5 to form an annular heat insulation cavity.

[0034] In this structure, the thermal insulation sleeve 9 is made of aerogel composite material or glass fiber reinforced engineering ceramic, a decision that combines extreme thermal insulation performance with necessary mechanical strength. Aerogel composite material has extremely low solid-state thermal conductivity and abundant nanoporous structure, which can effectively suppress heat conduction and convection; glass fiber reinforced engineering ceramic provides higher structural rigidity and durability while ensuring excellent heat resistance and low thermal conductivity. This thermal insulation sleeve 9 is precisely fitted between the pump shaft 1 and the heat dissipation module 5, forming a physical annular thermal insulation cavity. This cavity not only radially isolates the high-temperature heat dissipation module 5 from the relatively low-temperature pump shaft 1, but its ultra-low thermal conductivity also constitutes the main thermal resistance barrier. This design forces the radial inward transmission path of heat transferred from the sealing end face and introduced into the heat dissipation module 5 to be greatly inhibited, significantly improving the efficiency of the cooling system and fundamentally protecting the pump shaft 1 and its rear bearings and other precision components from the damage caused by high-temperature backflow, ensuring the long-term reliable operation of the transmission system.

[0035] In one embodiment, the rotating ring assembly 3 includes a rotating ring seat 10, a rotating ring 11, and an elastic compensation mechanism 12. The rotating ring seat 10 is fixedly connected to the pump shaft 1 and rotates synchronously. The elastic compensation mechanism 12 is installed between the rotating ring seat 10 and the rotating ring 11 and is used to apply an axial preload to the rotating ring 11 so that the end face of the rotating ring is in close contact with the end face of the stationary ring assembly 4.

[0036] In this structure, the rotating ring seat 10 serves as a rotating carrier fixedly connected to the pump shaft 1. The elastic compensation mechanism 12 is ingeniously arranged between the rotating ring seat 10 and the rotating ring 11, which acts as a sealing actuator. Its core function is dual: firstly, it continuously applies a precisely designed axial preload to the rotating ring 11 in both static and running states. This force is transmitted through the end face of the rotating ring 11 to the end face of the stationary ring assembly 4, which is the fundamental guarantee for forming an initial seal and maintaining the necessary sealing specific pressure. Secondly, it provides axial flexibility and responsiveness. When the sealing end face is slowly worn down due to normal wear during operation, or when it undergoes thermal expansion / contraction due to drastic temperature changes, the elastic compensation mechanism 12 can instantly and automatically expand and contract, driving the rotating ring 11 to make a small compensating displacement along the axial direction. This dynamic adjustment process ensures that the end face of the moving ring 11 can always actively and tightly fit against the end face of the stationary ring assembly 4, thereby effectively compensating for wear, absorbing vibration, and adapting to thermal deformation. While maintaining sealing performance, it greatly avoids leakage caused by end face separation or abnormal wear and heat generation caused by excessive compression.

[0037] In one embodiment, the elastic compensation mechanism 12 is an elastic bellows, wave spring or cylindrical spring. The elastic compensation mechanism 12 rotates synchronously with the moving ring assembly 3 to compensate for the wear and thermal deformation of the sealing end face.

[0038] In this structure, the elastic compensation mechanism 12 can be an elastic bellows, a wave spring, or a cylindrical spring. The elastic bellows provides large stroke compensation and excellent axial following; the wave spring is characterized by its compact structure and precise force; and the cylindrical spring offers high reliability and linear stability of the elastic force. This mechanism is not static but rotates synchronously with the pump shaft 1 at high speed along with the moving ring assembly 3. This design avoids sliding friction pairs and improves dynamic response speed and reliability. Its core function is dynamic compensation: on the one hand, it continuously absorbs and offsets the slight thickness loss of the sealing end face due to normal wear during long-term operation, pushing the moving ring 11 axially through its own elastic rebound, ensuring that the sealing end face always maintains the designed preload, thereby compensating for wear; on the other hand, when the pump starts or stops or operating conditions change, causing drastic temperature fluctuations, components such as the sealing ring will undergo thermal expansion or contraction. The elastic compensation mechanism 12 adapts to this thermal deformation through expansion and contraction, preventing end face separation or overpressure due to transient changes in component dimensions. This design, which integrates elastic force application, dynamic tracking, and rotational adaptability, ensures that the sealing end face can achieve continuous, stable, and adaptive fit under various working conditions, which is a key guarantee for the long service life and high reliability of the sealing pair.

[0039] In one embodiment, the stationary ring assembly 4 includes a stationary ring 13 and a stationary ring seat 14. The stationary ring seat 14 is fixedly connected to the pump body, and the stationary ring 13 is fixedly installed inside the stationary ring seat 14. The back end face of the stationary ring 13 is fully in contact with the high thermal conductivity filling layer 7.

[0040] In this structure, the stationary ring seat 14 serves as the mounting base for the entire assembly. Its fixed connection with the pump body provides crucial axial and radial rigidity constraints for the entire sealing pair, ensuring the structural stability of the sealing system under complex operating conditions. The stationary ring 13 is precisely installed and fixed within the inner cavity of the stationary ring seat 14. This nested fixing method not only ensures the perpendicularity of the working end face of the stationary ring 13 to the axis of the pump shaft 1, thereby obtaining a uniform sealing specific pressure, but also makes it a controlled and independent heat conduction unit. Crucially, the back end face of the stationary ring 13 is designed to achieve full, gapless contact with the high thermal conductivity filling layer 7. This design allows the stationary ring 13 to capture the high-density frictional heat generated at the sealing end face and then almost effortlessly direct the heat to the subsequent heat dissipation module 5. Therefore, the design of this stationary ring assembly 4 perfectly realizes its triple functional integration as a static seal, a heat collector, and a heat conduction initiator.

[0041] In one embodiment, the heat dissipation module 5 and the heat dissipation fins 8 are integrally die-cast aluminum alloy or copper alloy components.

[0042] In this structure, the heat dissipation module 5 and the heat dissipation fins 8 are integrally die-cast, and aluminum alloy or copper alloy is selected as the base material, which improves the performance and reliability of the heat dissipation system. From a material perspective, both aluminum alloy and copper alloy have excellent thermal conductivity, which can quickly diffuse the heat captured by the heat dissipation module 5 from the static ring component 4 to the entire component, laying the foundation for subsequent efficient heat dissipation. From a structural mechanics perspective, the integral molding gives the entire component extremely high structural strength and rigidity, which can withstand the airflow vibration and centrifugal stress that may be caused by high-speed rotation, eliminating the hidden danger of fins loosening or falling off due to fatigue, and ensuring extremely high long-term operational reliability.

[0043] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the 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.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A self-cooling mechanical seal device for a high-temperature pump, comprising a pump shaft (1), wherein an impeller (2), a dynamic ring assembly (3), a stationary ring assembly (4), a heat dissipation module (5), and a cooling fan (6) are arranged coaxially along the pump shaft (1), characterized in that: The rotating ring assembly (3) rotates synchronously with the pump shaft (1). The rotating ring assembly (3) and the stationary ring assembly (4) cooperate to form a sealing end face. The stationary ring assembly (4) is fixedly installed. The side of the stationary ring assembly (4) away from the sealing end face is tightly connected to the heat dissipation module (5). A high thermal conductivity filling layer (7) is provided between the stationary ring assembly (4) and the heat dissipation module (5). The radially extended heat dissipation fins (8) are integrally formed on the radial outer surface of the heat dissipation module (5). A heat insulation sleeve (9) is provided between the heat dissipation module (5) and the pump shaft (1). The cooling fan (6) is fixedly installed on the pump shaft (1) and located on the axial outer side of the heat dissipation module (5). The cooling fan (6) rotates synchronously with the pump shaft (1). An axial directional flow gap is formed between the cooling fan (6) and the heat dissipation fins (8) so that the axial airflow generated when the cooling fan (6) rotates directly blows onto the heat dissipation fins (8) and the surface of the heat dissipation module (5).

2. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The heat dissipation module (5) is an annular sleeve structure. The inner ring of the heat dissipation module (5) is attached to the outer wall of the heat insulation sleeve (9). The end face of the heat dissipation module (5) and the back end face of the static ring assembly (4) are pressed and attached to the high thermal conductivity filling layer (7). The heat dissipation fins (8) extend along the entire axial length of the heat dissipation module (5) and are evenly distributed circumferentially.

3. The self-cooling mechanical seal device for high-temperature pumps according to claim 2, characterized in that, An axial ventilation channel is formed between adjacent heat dissipation fins (8). The axial ventilation channel is consistent with the airflow direction output by the cooling fan (6), so that the airflow can pass through the entire length of the heat dissipation fins (8).

4. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The cooling fan (6) is an axial fan. The hub of the cooling fan (6) is interference-fitted with the pump shaft (1). The fan blades face the outer end face of the heat dissipation fins (8). The axial flow gap between the blades and the heat dissipation fins (8) is 5mm to 25mm.

5. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The high thermal conductivity filler layer (7) is a graphite thermal pad, aluminum nitride ceramic sheet or flexible metal thermal sheet with a thickness of 0.2mm to 1.5mm, used to eliminate the contact thermal resistance between the static ring assembly (4) and the heat dissipation module (5).

6. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The heat insulation sleeve (9) is made of aerogel composite material or glass fiber reinforced engineering ceramic. The heat insulation sleeve (9) is sleeved between the pump shaft (1) and the heat dissipation module (5) to form an annular heat insulation cavity.

7. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The rotating ring assembly (3) includes a rotating ring seat (10), a rotating ring (11), and an elastic compensation mechanism (12). The rotating ring seat (10) is fixedly connected to the pump shaft (1) and rotates synchronously. The elastic compensation mechanism (12) is installed between the rotating ring seat (10) and the rotating ring (11) to apply axial preload to the rotating ring (11) so that the end face of the rotating ring is in close contact with the end face of the stationary ring assembly (4).

8. The self-cooling mechanical seal device for high-temperature pumps according to claim 7, characterized in that, The elastic compensation mechanism (12) is an elastic bellows, wave spring or cylindrical spring. The elastic compensation mechanism (12) rotates synchronously with the moving ring assembly (3) to compensate for the wear and thermal deformation of the sealing end face.

9. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The stationary ring assembly (4) includes a stationary ring (13) and a stationary ring seat (14). The stationary ring seat (14) is fixedly connected to the pump body. The stationary ring (13) is fixedly installed inside the stationary ring seat (14). The back end face of the stationary ring (13) is fully in contact with the high thermal conductivity filling layer (7).

10. The self-cooling mechanical seal device for high-temperature pumps according to claim 1, characterized in that, The heat dissipation module (5) and the heat dissipation fins (8) are integrally die-cast aluminum alloy or copper alloy components.

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