Hydraulically stable mechanical seal structure

Abstract

The utility model relates to the field of assembled type shaft seal discloses a kind of mechanical sealing structure of hydraulic stability, including transmission sleeve, the transmission sleeve is arranged in the inside of sealing shell, the transmission sleeve is equipped with pumping ring, the outer wall of the pumping ring is fixed with several blades, several The blade is all distributed in spiral shape, the surface of several The blade is all coated with diamond-like coating, and reserved hole is set up on the sealing shell.In the utility model, through the synergies of transmission sleeve, sealing shell, pumping ring, blade, diamond-like coating, reserved hole, first static ring, dynamic ring and limit pressing plate, a high-efficiency stable mechanical sealing structure is jointly constructed, not only reduce fluid impact loss, but also make cooling liquid circulation speed more stable, improve the reliability and service life of mechanical seal, and maintenance is more convenient, can be pressurized and increase flow rate, and raw material cost is slightly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of cartridge shaft seals, specifically a hydraulically stable mechanical seal structure. Background Technology

[0002] A mechanical seal is a device that prevents fluid leakage by consisting of at least one pair of end faces perpendicular to the axis of rotation, which remain in contact and slide relative to each other under the action of fluid pressure, the elastic force (or magnetic force) of the compensation mechanism, and the cooperation of auxiliary seals. A modular mechanical seal assembles the main components, such as the rotating ring, stationary ring, spring, auxiliary sealing ring, transmission sleeve, and stationary sealing gasket, together outside the maintenance area. It can be replaced promptly when the equipment is shut down, simplifying the measurement and adjustment process. This not only reduces on-site maintenance time and saves maintenance costs but also improves installation accuracy, ensures sealing effect, and extends service life. Therefore, modular mechanical seals are widely used.

[0003] Chinese Patent Publication No. CN117145971A discloses a cartridge mechanical seal and its manufacturing method. The key technical features include a transmission sleeve and a sealing housing fitted onto the transmission sleeve. The transmission sleeve is provided with a fixing member for fixing the transmission sleeve to a rotating shaft. A dynamic sealing assembly is provided on the transmission sleeve. A static sealing assembly is provided on the sealing housing to cooperate with the dynamic sealing assembly for sealing. Several lugs are provided on the side wall of the sealing housing, and at least two of the lugs have pre-drilled holes penetrating the sealing housing. A plug for sealing the pre-drilled holes is detachably installed in each pre-drilled hole. A pumping ring is fitted onto the transmission sleeve.

[0004] In the above scheme, a double-end mechanical seal is formed by setting a stationary ring one and a stationary ring two and a dynamic sealing assembly. The pumping ring follows the rotation of the transmission sleeve to drive the coolant in the sealing space. This results in the following disadvantage: the mechanical seal does not have a hydrodynamic structure, which makes the coolant circulation speed unstable. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulically stable mechanical seal structure to solve the problem that the mechanical seal lacks a hydrodynamic structure, resulting in an unstable coolant circulation rate.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a hydraulically stable mechanical seal structure, including a transmission sleeve, which is fitted inside a sealing shell. A pumping ring is fitted on the transmission sleeve. Several blades are fixed on the outer wall of the pumping ring. The blades are all spirally distributed, and the inclination angle of the blades is 15°. The surface of the blades is coated with a diamond-like carbon coating. A pre-drilled hole is provided on the sealing shell. A first stationary ring is provided on the sealing shell. A moving ring is provided between the first stationary ring and the transmission sleeve. A limiting pressure plate is bolted to the sealing shell. The limiting pressure plate is fitted on the first stationary ring.

[0007] Preferably, the reserved hole is a gradually narrowing and expanding flow channel.

[0008] Preferably, the transmission sleeve is provided with a pair of semi-circular locking rings, and the two locking rings have two first threaded holes.

[0009] Preferably, the first stationary ring is provided with a plurality of first heat-conducting pillars, and the moving ring is provided with a plurality of second heat-conducting pillars.

[0010] Preferably, a stationary ring seat is provided between the two locking rings and the sealing housing, and a second stationary ring is provided between the stationary ring seat and the transmission sleeve, forming a balanced mechanical seal between the second stationary ring, the first stationary ring, and the rotating ring.

[0011] Preferably, a first sealing ring is provided between the first stationary ring and the limiting pressure plate, a second sealing ring is provided between the moving ring and the transmission sleeve, and a third sealing ring is provided between the stationary ring seat and the sealing housing.

[0012] Preferably, an elastic element is provided between the transmission sleeve and the moving ring.

[0013] Preferably, the sealing housing has a second threaded hole, the outer wall of the transmission sleeve has several grooves, the bottom of the transmission sleeve has several mounting holes, the mounting holes are distributed at 15°, and the outer wall of the sealing housing has several U-shaped grooves.

[0014] Compared with existing technologies, the hydraulically stabilized mechanical seal structure adopting the above technical solution has the following beneficial effects:

[0015] 1. In use, through the synergistic action of the transmission sleeve, sealing housing, pumping ring, blades, diamond-like coating, reserved hole, first stationary ring, dynamic ring and limiting pressure plate, a highly efficient and stable mechanical seal structure is constructed. This not only reduces fluid impact loss, but also makes the coolant circulation speed more stable, improves the reliability and service life of the mechanical seal, and makes maintenance more convenient. It can also increase pressure and flow rate, and slightly reduce raw material costs.

[0016] Second, during use, this gradually expanding and contracting design makes the fluid flow within the channel smoother, effectively improving the stability of the local flow velocity. A stable flow velocity is crucial for the mechanical seal structure, ensuring uniform distribution of coolant within the sealing space, providing continuous and stable cooling and lubrication to the sealing components, reducing problems such as decreased sealing performance and equipment wear caused by flow velocity fluctuations, thereby improving the reliability and stability of the entire mechanical seal system. It also ensures a secure and reliable connection between the transmission sleeve and the rotating shaft, reducing malfunctions and wear during equipment operation, improving the stability and reliability of the entire mechanical seal structure, and extending the service life of the equipment.

[0017] Thirdly, during operation, the presence of the first and second heat-conducting pillars enables the rapid transfer of heat generated by the friction between the first stationary ring and the rotating ring into the circulating fluid, maintaining a relatively stable coolant temperature. This avoids flow rate fluctuations caused by localized coolant vaporization, ensuring the normal operation of the mechanical seal under high-temperature conditions and improving its performance and service life. The balanced mechanical seal can better withstand high pressure, reducing wear and leakage on the sealing surface, and improving its pressure-bearing capacity and stability. This design meets the requirements of mechanical seals under high-pressure conditions, ensuring reliable operation of the equipment in complex working environments.

[0018] Fourth, during use, the entire mechanical seal structure is isolated from the external environment, improving its reliability and safety. The three sealing rings work together to seal the mechanical seal structure from different locations, effectively preventing leakage and ensuring the normal operation of the mechanical seal system. The elastic element absorbs and buffers these movements and vibrations through its own elastic deformation, maintaining a tight fit between the sealing ring surfaces and preventing seal failure due to vibration or movement. The presence of the elastic element improves the adaptability and stability of the mechanical seal, ensuring reliable operation under various working conditions. This makes the entire mechanical seal structure and equipment a unified whole, guaranteeing the stability of the mechanical seal during equipment operation. These rationally designed and mutually coordinated structures provide strong support for the installation, fixation, and normal operation of the mechanical seal structure, improving the overall performance and reliability of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment.

[0020] Figure 2 This is a schematic diagram of the transmission sleeve structure in an embodiment.

[0021] Figure 3 This is a schematic diagram of the pumping ring structure in an embodiment.

[0022] Figure 4This is a bottom view of the pumping ring in an embodiment.

[0023] Figure 5 This is a bottom view of the sealed housing in an embodiment.

[0024] In the diagram: 1. Transmission sleeve; 2. Sealing housing; 3. Pumping ring; 4. Blade; 5. Diamond-like carbon coating; 6. Reserved hole; 7. First stationary ring; 8. Rotary ring; 9. Limiting pressure plate; 10. Locking ring; 11. First threaded hole; 12. First heat-conducting column; 13. Second heat-conducting column; 14. Stationary ring seat; 15. Second stationary ring; 16. First sealing ring; 17. Second sealing ring; 18. Third sealing ring; 19. Elastic element; 20. Second threaded hole; 21. Groove; 22. Mounting hole; 23. U-shaped groove. Detailed Implementation

[0025] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1-5 As shown, a hydraulically stable mechanical seal structure includes a transmission sleeve 1, which is fitted inside a sealing housing 2. A pumping ring 3 is fitted on the transmission sleeve 1. Several blades 4 are fixed on the outer wall of the pumping ring 3. The blades 4 are all spirally distributed and have an inclination angle of 15°. The surfaces of the blades 4 are coated with a diamond-like carbon coating 5. A pre-drilled hole 6 is provided on the sealing housing 2. A first stationary ring 7 is provided on the sealing housing 2. A moving ring 8 is provided between the first stationary ring 7 and the transmission sleeve 1. A limit plate 9 is bolted to the sealing housing 2 and fitted on the first stationary ring 7. The transmission sleeve 1, the sealing housing 2, and the pumping ring 3 are all made of 304 stainless steel.

[0027] During use, the first stationary ring 7 and the rotating ring 8 are in close contact, forming a crucial sealing surface that effectively prevents leakage of the internal medium. The limiting pressure plate 9 is fitted onto the first stationary ring 7, its small inner diameter carefully designed to be smaller than the maximum outer diameter of the first stationary ring 7. This ingenious design ensures that the limiting pressure plate 9 reliably limits the first stationary ring 7, preventing it from falling off during operation and ensuring the stability of the mechanical seal structure. The transmission sleeve 1, sealing housing 2, rotating ring 8, and first stationary ring 7 together form a relatively independent sealing space. The pumping ring 3 rotates synchronously with the transmission sleeve 1, and its outer wall is fixed with several spirally distributed blades 4, each with an inclination angle of 15°. This spiral blade design 4 guides the coolant to flow along a specific spiral path when rotating, effectively reducing fluid impact loss and making the coolant flow more stable and orderly. The 15° tilt angle design reduces local pressure drop. At the same time, the diamond-like carbon coating 5 on the surface of the blade 4 has excellent wear resistance and low friction coefficient, further reducing the frictional resistance between the blade 4 and the coolant and improving pumping efficiency. Through the rotation of the pumping ring 3, the coolant in the sealed space is driven to achieve forced pressurization and circulation, ensuring that the coolant can continuously and stably provide cooling and lubrication to the sealing parts, and ensuring the stable performance of the mechanical seal during long-term operation.

[0028] Through the synergistic action of the transmission sleeve 1, sealing housing 2, pumping ring 3, blade 4, diamond-like coating 5, reserved hole 6, first stationary ring 7, dynamic ring 8 and limiting pressure plate 9, a highly efficient and stable mechanical seal structure is constructed. This not only reduces fluid impact loss, but also makes the coolant circulation speed more stable, improves the reliability and service life of the mechanical seal, makes maintenance more convenient, can increase pressure and flow rate, and slightly reduces raw material costs.

[0029] like Figure 1 As shown, the reserved hole 6 is a gradually narrowing expansion channel.

[0030] In use, the reserved hole 6 adopts a gradually narrowing and expanding flow channel design. Compared with the traditional straight through hole, the gradually narrowing and expanding flow channel allows the cross-section of the flow channel to change gradually as the fluid passes through, avoiding the problem of increased fluid resistance caused by abrupt interface changes. When the fluid enters the narrowing section, the cross-sectional area of ​​the flow channel gradually decreases. According to the principles of fluid mechanics, the fluid velocity will gradually increase, and at the same time, pressure energy is converted into kinetic energy, allowing the fluid to enter the expanding section at a higher speed. In the expanding section, the cross-sectional area of ​​the flow channel gradually increases, the fluid velocity gradually decreases, and the pressure energy is restored to a certain extent. This gradually narrowing and expanding design makes the fluid flow in the flow channel more stable, effectively improving the stability of the local flow velocity. Stable flow velocity is crucial for the mechanical seal structure. It can ensure that the coolant is evenly distributed in the sealing space, providing continuous and stable cooling and lubrication for the sealing parts, reducing problems such as decreased sealing performance and equipment wear caused by flow velocity fluctuations, thereby improving the reliability and stability of the entire mechanical seal system.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, the transmission sleeve 1 is provided with a pair of semi-circular locking rings 10, and two first threaded holes 11 are opened on the two locking rings 10. Several first heat-conducting pillars 12 are embedded on the first stationary ring 7, and several second heat-conducting pillars 13 are embedded on the rotating ring 8. A stationary ring seat 14 is provided between the two locking rings 10 and the sealing housing 2. A second stationary ring 15 is provided between the stationary ring seat 14 and the transmission sleeve 1. The second stationary ring 15, the first stationary ring 7, and the rotating ring 8 form a balanced mechanical seal.

[0032] In use, two locking rings 10 are fixed together with screws through the first threaded hole 11. As the screws are tightened, the two locking rings 10 are gradually compressed and evenly pressed against the transmission sleeve 1. This uniform force distribution causes the transmission sleeve 1 to deform evenly in the circumference, thus tightly gripping the rotating shaft and firmly fixing the transmission sleeve 1 to it. Compared to the traditional single-point force fixing method, this design effectively avoids the deformation problem caused by single-point force on the transmission sleeve 1. Deformation of the transmission sleeve 1 not only scratches the rotating shaft, affecting its normal operation, but also reduces the service life of the transmission sleeve 1 itself. This uniform force-distributing locking ring 10 fixing method ensures a firm and reliable connection between the transmission sleeve 1 and the rotating shaft, reducing malfunctions and wear during equipment operation, improving the stability and reliability of the entire mechanical seal structure, and extending the service life of the equipment.

[0033] Both the first heat-conducting column 12 and the second heat-conducting column 13 are made of 304 stainless steel. 304 stainless steel has thermal conductivity and can quickly conduct heat away. During the operation of the mechanical seal, frictional heat is generated between the first stationary ring 7 and the rotating ring 8. If this heat cannot be dissipated in time, it will cause the local temperature of the coolant to rise, which will lead to local vaporization of the coolant. After the coolant vaporizes, its volume will change abruptly, resulting in flow rate fluctuations and affecting the stability and reliability of the mechanical seal. The presence of the first heat-conducting column 12 and the second heat-conducting column 13 can quickly dissipate the heat generated by the friction between the first stationary ring 7 and the rotating ring 8 into the circulating fluid, keeping the temperature of the coolant relatively stable. This avoids the flow rate fluctuation problem caused by local vaporization of the coolant, ensures the normal operation of the mechanical seal under high-temperature conditions, and improves the performance and service life of the mechanical seal.

[0034] The second stationary ring 15 forms a single-end face internal mechanical seal. This sealing method can effectively seal the medium in the equipment or the external process medium. It can be used for mechanical seal circulation cooling or flushing operations. Through the cooperation between the stationary ring seat 14, the second stationary ring 15, the first stationary ring 7 and the moving ring 8, a balanced mechanical seal structure is formed. It can automatically adjust the sealing force according to the pressure difference on both sides of the sealing surface, so that the specific pressure on the sealing surface is kept within a reasonable range. Under the high-pressure coolant environment formed by the pumping ring 3, the balanced mechanical seal can better withstand high pressure, reduce the wear and leakage of the sealing surface, and improve the pressure bearing capacity and stability of the mechanical seal. This design meets the requirements of mechanical seals under high-pressure conditions and ensures the reliable operation of the equipment in complex working environments.

[0035] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a first sealing ring 16 is provided between the first stationary ring 7 and the limiting pressure plate 9, a second sealing ring 17 is provided between the rotating ring 8 and the transmission sleeve 1, a third sealing ring 18 is provided between the stationary ring seat 14 and the sealing housing 2, an elastic element 19 is provided between the transmission sleeve 1 and the rotating ring 8, a second threaded hole 20 is provided on the sealing housing 2, a number of grooves 21 are provided on the outer wall of the transmission sleeve 1, a number of mounting holes 22 are provided on the bottom of the transmission sleeve 1, the number of mounting holes 22 are distributed at 15°, and a number of U-shaped grooves 23 are provided on the outer wall of the sealing housing 2.

[0036] During use, the first sealing ring 16 effectively prevents external impurities from entering the gap between the first stationary ring 7 and the limiting pressure plate 9, while also preventing coolant leakage within the sealed space. This ensures the sealing performance between the first stationary ring 7 and the limiting pressure plate 9, and guarantees that the limiting effect of the limiting pressure plate 9 on the first stationary ring 7 is not affected. The second sealing ring 17 prevents coolant leakage from the gap between the moving ring 8 and the transmission sleeve 1, ensuring sufficient and stable circulation of coolant within the sealed space, and providing good conditions for sealing between the moving ring 8 and the first stationary ring 7. The third sealing ring 18 prevents the medium in the equipment or external process medium from leaking from the gap between the stationary ring seat 14 and the sealing housing 2, ensuring the isolation of the entire mechanical seal structure from the external environment and improving the reliability and safety of the mechanical seal. These three sealing rings work together to seal the mechanical seal structure from different parts, effectively preventing leakage problems and ensuring the normal operation of the mechanical seal system.

[0037] The elastic element 19 is a helical spring. Both ends of the elastic element 19 abut against the transmission sleeve 1 and the rotating ring 8, respectively. Under the elastic force of the elastic element 19, the rotating ring 8 is steadily pressed against the first stationary ring 7, thereby forming a tightly fitting sealing ring surface. This design ensures that the rotating ring 8 and the first stationary ring 7 always maintain sufficient sealing force, which can effectively prevent leakage of the internal medium. At the same time, the helical spring has good elasticity and buffering performance. During the operation of the equipment, when there is a small relative movement or vibration between the rotating ring 8 and the first stationary ring 7, the elastic element 19 can absorb and buffer these movements and vibrations through its own elastic deformation, maintain the tight fit of the sealing ring surface, and avoid sealing failure caused by vibration or movement. The presence of the elastic element 19 improves the adaptability and stability of the mechanical seal, ensuring that the mechanical seal can work reliably under various working conditions.

[0038] Bolts can be used to connect and fix the sealing housing 2 to other components through the second threaded hole 20, ensuring that the entire mechanical seal structure is installed firmly and reliably. Several grooves 21 on the outer wall of the transmission sleeve 1 are used for precise alignment of the positioning pin. Several mounting holes 22 on the bottom of the transmission sleeve 1 are distributed at 15°. This unique distribution may be to meet specific installation requirements or to match other internal structures of the equipment, ensuring that the transmission sleeve 1 can be accurately installed on the rotating shaft and work in conjunction with other components. Several U-shaped grooves 23 on the outer wall of the sealing housing 2 play an important role. Bolts can be used to firmly fix the sealing housing 2 to the equipment that needs to be sealed through the U-shaped grooves 23, making the entire mechanical seal structure and the equipment a whole, ensuring the stability of the mechanical seal during equipment operation. These structural designs are reasonable and work together to provide a strong guarantee for the installation, fixing and normal operation of the mechanical seal structure, improving the overall performance and reliability of the equipment.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hydraulically stabilized mechanical seal structure, comprising a transmission sleeve (1), the transmission sleeve (1) being fitted inside a sealing housing (2), characterized in that, A pumping ring (3) is fitted on the transmission sleeve (1). Several blades (4) are fixed on the outer wall of the pumping ring (3). The blades (4) are all spirally distributed. The inclination angle of the blades (4) is 15°. The surface of the blades (4) is coated with a diamond-like coating (5). A reserved hole (6) is opened on the sealing housing (2). A first stationary ring (7) is provided on the sealing housing (2). A moving ring (8) is provided between the first stationary ring (7) and the transmission sleeve (1). A limiting pressure plate (9) is connected to the sealing housing (2) by bolts. The limiting pressure plate (9) is fitted on the first stationary ring (7).

2. The hydraulically stabilized mechanical seal structure according to claim 1, characterized in that: The reserved hole (6) is a gradually narrowing and expanding flow channel.

3. The hydraulically stabilized mechanical seal structure according to claim 2, characterized in that: The transmission sleeve (1) is provided with a pair of semi-circular locking rings (10), and the two locking rings (10) have two first threaded holes (11).

4. The hydraulically stabilized mechanical seal structure according to claim 3, characterized in that: The first stationary ring (7) is provided with a plurality of first heat-conducting pillars (12), and the moving ring (8) is provided with a plurality of second heat-conducting pillars (13).

5. The hydraulically stabilized mechanical seal structure according to claim 4, characterized in that: A stationary ring seat (14) is provided between the two locking rings (10) and the sealing housing (2), and a second stationary ring (15) is provided between the stationary ring seat (14) and the transmission sleeve (1). The second stationary ring (15) forms a balanced mechanical seal with the first stationary ring (7) and the moving ring (8).

6. The hydraulically stabilized mechanical seal structure according to claim 5, characterized in that: A first sealing ring (16) is provided between the first stationary ring (7) and the limiting pressure plate (9), a second sealing ring (17) is provided between the moving ring (8) and the transmission sleeve (1), and a third sealing ring (18) is provided between the stationary ring seat (14) and the sealing housing (2).

7. The hydraulically stabilized mechanical seal structure according to claim 1, characterized in that: An elastic element (19) is provided between the transmission sleeve (1) and the moving ring (8).

8. The hydraulically stabilized mechanical seal structure according to claim 7, characterized in that: The sealing housing (2) has a second threaded hole (20), the outer wall of the transmission sleeve (1) has several grooves (21), the bottom of the transmission sleeve (1) has several mounting holes (22), the mounting holes (22) are distributed at 15°, and the outer wall of the sealing housing (2) has several U-shaped grooves (23).

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