A pump structure of a sealing end cover of an impeller bearing hole

Abstract

The utility model discloses a kind of sealing end covers of impeller bearing hole in pump structure, it is related to sealing end cover technical field, including shell, first sealing groove, bolt interface, cover and fourth limit slot;Mechanical sealing mechanism is arranged in the shell, the mechanical sealing mechanism includes third sealing ring, sealing ring, rubber ring, traction rod, spring piece, dynamic seal ring, the sealing ring right side is sequentially configured third sealing ring, rubber ring, spring piece and dynamic seal ring, the rubber ring is installed in the left side of traction rod, eight evenly distributed traction rods in rubber ring right side, the connecting stress between rubber ring and spring piece can be effectively dispersed, prevent single traction rod overload fracture, greatly promote the anti-vibration, shock resistance of mechanical sealing mechanism, adapt to the high-frequency operation condition of pump.

Description

Technical Field

[0001] This utility model relates to the field of sealing end cap technology, specifically a sealing end cap for the impeller bearing hole in a pump structure. Background Technology

[0002] As a key component of the pump structure, the impeller bearing bore sealing end cover has the core function of sealing the fit clearance between the impeller bearing bore and the shaft. On the one hand, it can effectively prevent leakage of liquids, gases and other media transported in the pump, ensuring the pump's transport efficiency and operational safety. On the other hand, it can isolate external dust, impurities and moisture from entering the bearing cavity, preventing the bearing from wearing and corroding due to contamination or foreign object intrusion, thereby ensuring the stable rotation of the impeller shaft and extending the service life of the bearing.

[0003] However, conventional pump impeller bearing hole sealing end caps on the market generally have technical defects such as insufficient sealing stability and weak adaptability to working conditions, which make it difficult to meet the actual needs of pump equipment for high-frequency operation and long-term continuous and stable operation, becoming a key bottleneck restricting the overall operational reliability of the pump body.

[0004] It should be noted that the "Anti-corrosion Shaft Sealing End Cover Device" with application number CN202322696832.9, although it optimizes the sealing effect through a specific structural design—it connects to the shaft through a connecting hole, opens a connecting groove on the top of the sealing cover, embeds the sealing ring fixed at the bottom of the rubber ring into the connecting groove, and correspondingly sets four first threaded holes (sealing cover side) and four first round holes (rubber ring side), and uses the first screw to pass through the round holes and threaded holes to achieve a stable connection between the sealing ring and the rubber ring, thereby avoiding loosening of the sealing component and ensuring the basic anti-corrosion sealing effect—has obvious functional limitations: First, it does not design a compensation structure for the wear problem of the sealing surface after long-term use. As the usage time increases, the wear of the sealing surface will directly lead to an increase in leakage; Second, it lacks a special design to adapt to the high-frequency vibration and pressure fluctuation conditions of pump equipment, and cannot withstand the impact of dynamic conditions on the sealing structure during pump operation. Therefore, it is difficult to apply to the impeller bearing hole sealing scenario of pump equipment.

[0005] Based on this, this solution proposes "a sealing end cover for the impeller bearing hole in a pump structure" to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a sealing end cover for the impeller bearing hole in a pump structure, so as to solve the problem mentioned in the background art that the existing equipment on the market is not adapted to the special design of pump equipment under high pressure fluctuation conditions.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a sealing end cover for an impeller bearing hole in a pump structure, comprising a housing, a first sealing groove, a bolt interface, a cover plate, and a fourth limiting groove;

[0008] A mechanical seal mechanism is provided inside the housing. The mechanical seal mechanism includes a third sealing ring, a sealing ring, a rubber ring, a traction rod, a spring plate, and a dynamic sealing ring. The third sealing ring, the rubber ring, the spring plate, and the dynamic sealing ring are arranged sequentially on the right side of the sealing ring. The rubber ring is installed on the left side of the traction rod.

[0009] As a preferred technical solution of this utility model, a first sealing groove is provided on the left side of the housing, a bolt interface is provided on the outer side of the housing, and four bolt interfaces are evenly arranged. A fifth sealing ring is provided inside the housing, and a third sealing groove is provided on the right side of the fifth sealing ring, with three third sealing grooves evenly distributed. A fourth sealing groove is arranged parallel to the right side of the third sealing groove.

[0010] The above technical solution involves a first sealing groove on the left side of the housing, four evenly arranged bolt interfaces on the outer side of the housing, a fifth sealing ring inside the housing, and three evenly distributed third sealing grooves on the right side of the fifth sealing ring, with a fourth sealing groove arranged parallel to the right side of the third sealing grooves. On the one hand, the four evenly arranged bolt interfaces ensure uniform stress distribution when the housing is assembled with other pump components, avoiding local stress concentration that could lead to housing deformation or bolt loosening, thus ensuring the overall connection stability of the sealing end cover and providing a structural foundation for subsequent sealing. On the other hand, the first sealing groove and the fifth sealing ring form an "outer-inner" pre-sealing defense line, which can block some media penetration in advance. The three evenly distributed third sealing grooves and the parallel fourth sealing groove provide precise positioning for subsequent sealing ring installation, ensuring a continuous sealing path, reducing the pressure on the main sealing mechanism, and improving the overall sealing redundancy.

[0011] As a preferred technical solution of this utility model, the first sealing ring is engaged with the fifth sealing ring, the second sealing ring is engaged with the third sealing groove, the housing is engaged with the static sealing ring through the first sealing ring and the second sealing ring, and the sealing ring is movably connected to the right side of the static sealing ring;

[0012] The above technical solution involves the fifth sealing ring engaging with the first sealing ring, the third sealing groove engaging with the second sealing ring, and the housing engaging with the static sealing ring via the first and second sealing rings. The right side of the static sealing ring is also movably connected to the sealing ring. This tight "groove-ring" engagement structure effectively prevents the first and second sealing rings from shifting or falling off during pump operation vibration, avoiding the sealing failure problems common in traditional bonding seals. The double sealing ring design also forms a double sealing barrier between the housing and the static sealing ring, significantly reducing the risk of leakage. Simultaneously, the movable connection between the static sealing ring and the sealing ring can accommodate slight deformation and displacement of the sealing ring due to temperature changes or media pressure fluctuations, preventing wear or cracking of the sealing surfaces of the static sealing ring and the sealing ring caused by rigid connections. This extends the service life of the "sealing pair" and reduces maintenance frequency.

[0013] As a preferred technical solution of this utility model, the right side of the sealing ring is engaged with the second sealing ring, the right side of the sealing ring is fixedly connected with the third sealing ring, the right side of the third sealing ring is provided with the second limiting groove, the second limiting groove is movably connected with the rubber ring, there are four rubber rings evenly distributed, and the surface of the rubber rings is staggered with through grooves, the right side of the rubber ring is fixedly connected with the traction rod, there are eight traction rods evenly distributed.

[0014] The above technical solution involves a second sealing ring engaging with the right side of the sealing ring, a third sealing ring fixedly connected to the right side of the sealing ring, a second limiting groove on the right side of the third sealing ring with four evenly distributed rubber rings having staggered through grooves on their surfaces movably connected within the second limiting groove, and eight evenly distributed traction rods fixedly connected to the right side of the rubber rings. The second and third sealing rings on the right side of the sealing ring form a multi-stage protection of "movable seal + fixed seal," which can effectively prevent the medium from penetrating through the gap between the sealing ring and the rubber ring. The four rubber rings with through grooves can evenly transmit the elastic force of the subsequent spring plate to the sealing ring, ensuring that the sealing pressure of the sealing ring and the static sealing ring is consistent. The through grooves can also provide buffer space for the rubber ring to change and assist in heat dissipation, preventing the rubber ring from breaking. The eight evenly distributed traction rods can disperse the connection stress between the rubber ring and the spring plate, avoiding the overload breakage of a single traction rod, improving the vibration and impact resistance of the mechanical seal mechanism, and adapting to the high-frequency operation conditions of the pump.

[0015] As a preferred technical solution of this utility model, the right side of the traction rod is engaged with a spring plate through a third limiting groove. The spring plate has a three-layer structure, and a third limiting groove is opened on the side of the spring plate. The third limiting groove is a semi-circular structure.

[0016] Using the above technical solution, the right side of the traction rod is connected to a spring plate via a third limiting groove. The spring plate has a three-layer structure, and a semi-circular third limiting groove is opened on the side of the spring plate. Compared with a single-layer spring plate, the three-layer spring plate has a larger elastic deformation range and more stable and durable elastic force. It can compensate for the gap between the sealing ring and the static sealing ring caused by long-term wear in real time, avoiding the problems of insufficient compensation force and easy fatigue failure of traditional single-layer spring plates. The semi-circular third limiting groove on the side of the spring plate can reduce frictional damage to the traction rod, extend the service life of the traction rod, and at the same time ensure that the elastic force of the spring plate is accurately transmitted to the sealing ring, preventing uneven force on the sealing surface. Moreover, the engagement connection between the traction rod and the spring plate does not require additional fasteners, making assembly and disassembly convenient, saving assembly and disassembly time, and reducing maintenance difficulty.

[0017] As a preferred technical solution of this utility model, the right side of the traction rod is movably connected to the dynamic sealing ring through the second sealing groove, and the inner wall of the dynamic sealing ring is provided with a fourth limiting groove, and the fourth sealing ring is engaged and connected in the fourth limiting groove;

[0018] Using the above technical solution, the right side of the traction rod is movably connected to the dynamic sealing ring through the second sealing groove. The inner wall of the dynamic sealing ring has a fourth limiting groove, and the fourth sealing ring is engaged in the fourth limiting groove. The movable connection between the traction rod and the dynamic sealing ring allows the dynamic sealing ring to rotate synchronously with the impeller shaft, adapting to the pump's working principle. At the same time, the second sealing groove can seal the gap between the two, filling the design defect of traditional dynamic connections that are prone to leakage. The fourth limiting groove on the inner wall of the dynamic sealing ring can fix the fourth sealing ring, preventing the fourth sealing ring from being thrown off when the dynamic sealing ring rotates at high speed. At the same time, the fourth sealing ring can tightly fill the gap between the dynamic sealing ring and the impeller shaft, forming a key dynamic sealing defense line against the shaft surface, preventing the medium from leaking along the impeller shaft surface.

[0019] As a preferred technical solution of this utility model, the right side of the dynamic sealing ring is movably connected to the cover plate through the first limiting groove, the left side of the cover plate is bolted to fix the housing, the surface of the cover plate is provided with ventilation holes, and the right side of the cover plate is provided with heat dissipation grooves.

[0020] The above technical solution involves a cover plate movably connected to the right side of the dynamic sealing ring via a first limiting groove. The cover plate is bolted to the left side of the housing. Ventilation holes are opened on the surface of the cover plate, and a heat dissipation groove is opened on the right side of the cover plate. The bolted connection between the cover plate and the housing forms a closed structure, which can prevent external dust, impurities, and moisture from entering the internal mechanical seal mechanism, spring plates, sealing rings, and other components. This prevents the sealing components from being worn or failing due to contamination. The connection between the dynamic sealing ring and the first limiting groove of the cover plate can precisely constrain the axial displacement of the dynamic sealing ring, preventing it from detaching from the sealing position due to excessive axial force. This ensures that the sealing surfaces of the dynamic sealing ring and the static sealing ring are properly fitted. The ventilation holes of the cover plate can introduce cold air, and the heat dissipation groove increases the heat dissipation area. The combination of these two can quickly remove the frictional heat of the sealing mechanism, reducing the temperature of components such as the first sealing ring, second sealing ring, third sealing ring, fourth sealing ring, and rubber ring, and extending their service life. At the same time, it avoids the impact of high temperature on the sealing effect caused by changes in the viscosity of the medium. Furthermore, the bolted cover plate is easy to disassemble and assemble, greatly reducing maintenance difficulty and shortening pump downtime for maintenance.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. The four evenly arranged bolt interfaces on the outer side of the housing ensure even stress distribution when assembling the housing with other pump components, preventing housing deformation or bolt loosening caused by localized stress concentration, thus laying a solid foundation for the overall structure. At the same time, the eight evenly distributed traction rods on the right side of the rubber ring effectively disperse the connection stress between the rubber ring and the spring plate, preventing the single traction rod from breaking due to overload, and significantly improving the vibration and impact resistance of the mechanical seal mechanism, making it suitable for the high-frequency operating conditions of the pump.

[0023] 2. The first sealing groove on the left side of the housing and the fifth sealing ring inside form an "outer-inner" pre-sealing defense line, which blocks some media from penetrating in advance. The three evenly distributed third sealing grooves and the parallel fourth sealing groove provide precise positioning for the installation of the sealing ring, ensuring the continuity of the sealing path. The "groove-ring" structure in which the fifth sealing ring engages with the first sealing ring and the third sealing groove engages with the second sealing ring can prevent the sealing ring from shifting and falling off due to pump vibration. The double sealing rings also form a double barrier between the housing and the stationary sealing ring. At the same time, the movable connection between the stationary sealing ring and the sealing ring adapts to deformation, and the three-layer spring sheet compensates for wear gaps, significantly reducing the risk of leakage.

[0024] 3. The ventilation holes on the surface of the cover plate can introduce external cold air, and the heat dissipation groove on the right side increases the heat dissipation area. The combination of the two can quickly remove the frictional heat generated during the operation of the sealing mechanism, and prevent the aging of components such as the first sealing ring, the second sealing ring, and the rubber ring caused by high temperature. In addition, the cover plate is fixed to the housing with bolts to form a closed structure, which can block external dust, impurities, and moisture from entering the internal mechanical sealing mechanism, spring plates, etc., and prevent the sealing components from being worn or failing due to contamination.

[0025] 4. The traction rod and spring plate are connected by a semi-circular third limiting groove, which does not require additional fasteners. They can be directly engaged during assembly and quickly separated during disassembly, saving a lot of assembly and disassembly time. The bolt connection between the cover plate and the housing allows the cover plate to be opened by simply unscrewing the bolts, so that the internal sealing components can be directly inspected. Compared with traditional welding or one-piece molding structures, this greatly reduces the difficulty of maintenance and shortens the downtime of pump maintenance. Attached Figure Description

[0026] Figure 1 This is a side view of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the bolt interface and cover plate structure of this utility model;

[0028] Figure 3 This is a side view of the cross-sectional structure of the cover plate of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the second and third sealing rings of this utility model;

[0030] Figure 5 This is a side view of the cross-sectional structure of the shell of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the first sealing ring and the second sealing ring of this utility model;

[0032] Figure 7 This is a side view of the cross-sectional structure of the dynamic sealing ring of this utility model;

[0033] Figure 8This is a schematic diagram of the traction rod and spring plate structure of this utility model;

[0034] Figure 9 This is a schematic diagram of the third sealing ring and the second limiting groove of this utility model;

[0035] Figure 10 This is a schematic diagram of the structure of the second sealing ring and sealing ring of this utility model;

[0036] Figure 11 This is a schematic diagram of the structure of the first sealing groove and the third sealing ring of this utility model;

[0037] Figure 12 This is a side view of the adhesive ring structure of this utility model;

[0038] Figure 13 This is a schematic diagram of the spring sheet and the third limiting groove structure of this utility model;

[0039] Figure 14 This is a schematic diagram of the second sealing groove and dynamic sealing ring structure of this utility model.

[0040] In the diagram: 1. Housing; 2. First sealing groove; 3. Bolt interface; 4. Cover plate; 5. Heat dissipation groove; 6. Ventilation hole; 7. Second sealing groove; 8. Dynamic sealing ring; 9. Static sealing ring; 10. Third sealing groove; 11. Fourth sealing groove; 12. First sealing ring; 13. Second sealing ring; 14. Third sealing ring; 15. Fourth sealing ring; 16. First limiting groove; 17. Fifth sealing ring; 18. Sealing ring; 19. Rubber ring; 20. Traction rod; 21. Spring plate; 22. Second limiting groove; 23. Third limiting groove; 24. Fourth limiting groove. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Please see Figure 1-14The present invention provides a sealing end cover for an impeller bearing hole in a pump structure, comprising a housing 1, a first sealing groove 2, a bolt interface 3, a cover plate 4, a heat dissipation groove 5, a ventilation hole 6, a second sealing groove 7, a dynamic sealing ring 8, a static sealing ring 9, a third sealing groove 10, a fourth sealing groove 11, a first sealing ring 12, a second sealing ring 13, a third sealing ring 14, a fourth sealing ring 15, a first limiting groove 16, a fifth sealing ring 17, a sealing ring 18, a rubber ring 19, a traction rod 20, a spring plate 21, a second limiting groove 22, a third limiting groove 23, and a fourth limiting groove 24.

[0043] A mechanical seal mechanism is provided inside the housing 1. The mechanical seal mechanism includes a third sealing ring 14, a sealing ring 18, a rubber ring 19, a traction rod 20, a spring plate 21, and a dynamic sealing ring 8. The third sealing ring 14, the rubber ring 19, the spring plate 21, and the dynamic sealing ring 8 are arranged sequentially on the right side of the sealing ring 18. The rubber ring 19 is installed on the left side of the traction rod 20.

[0044] A first sealing groove 2 is formed on the left side of the housing 1, four evenly arranged bolt interfaces 3 are formed on the outer side, and a fifth sealing ring 17 is formed on the inner side. Three evenly distributed third sealing grooves 10 are formed on the right side of the fifth sealing ring 17, and a fourth sealing groove 11 is arranged in parallel to the right side of the third sealing groove 10. On the one hand, the four evenly arranged bolt interfaces 3 can make the housing 1 and other pump body components evenly stressed during assembly, avoiding local stress concentration that could cause deformation of the housing 1 or loosening of bolts, ensuring the overall connection stability of the sealing end cover, and laying a solid structural foundation for subsequent sealing. On the other hand, the first sealing groove 2 and the fifth sealing ring 17 form an "outer side-inner side" pre-sealing defense line, which can block some media penetration in advance. The three evenly distributed third sealing grooves 10 and the parallel fourth sealing groove 11 can provide precise positioning for subsequent sealing ring installation, ensuring that the sealing path is continuous and uninterrupted, effectively reducing the pressure of the main sealing mechanism and improving the overall sealing redundancy.

[0045] The first sealing ring 12 is engaged within the fifth sealing ring 17, and the second sealing ring 13 is engaged within the third sealing groove 10. The housing 1 is connected to the stationary sealing ring 9 through the engagement of the first sealing ring 12 and the second sealing ring 13. The right side of the stationary sealing ring 9 is movably connected to the sealing ring 18. The tight engagement structure of the "groove-ring" can effectively prevent the first sealing ring 12 and the second sealing ring 13 from shifting or falling off when the pump vibrates during operation, avoiding the sealing failure problem that is prone to occur in traditional bonding seals. The double sealing ring design can also form a double sealing barrier between the housing 1 and the stationary sealing ring 9, significantly reducing the risk of leakage. At the same time, the movable connection between the stationary sealing ring 9 and the sealing ring 18 can adapt to the slight deformation and displacement of the sealing ring 18 caused by temperature changes or medium pressure fluctuations, avoiding wear or cracking of the sealing surfaces of the stationary sealing ring 9 and the sealing ring 18 caused by rigid connection, extending the service life of the "sealing pair" composed of the two and reducing the frequency of maintenance.

[0046] The right side of the sealing ring 18 is both engaged with the second sealing ring 13 and fixedly connected to the third sealing ring 14. A second limiting groove 22 is opened on the right side of the third sealing ring 14, and four evenly distributed rubber rings 19 with staggered through grooves are movably connected in the groove. Eight evenly distributed traction rods 20 are fixedly connected to the right side of the rubber rings 19. The second sealing ring 13 and the third sealing ring 14 on the right side of the sealing ring 18 form a multi-stage protection of "movable seal + fixed seal", which can effectively prevent the medium from penetrating from the gap between the sealing ring 18 and the rubber rings 19. The four rubber rings 19 with through grooves can evenly transmit the elastic force of the subsequent spring plate 21 to the sealing ring 18, ensuring that the sealing pressure of the sealing ring 18 and the static sealing ring 9 is consistent. The through grooves can also provide buffer space for the deformation of the rubber rings 19 and assist in heat dissipation, preventing the rubber rings 19 from breaking. In addition, the eight evenly distributed traction rods 20 can disperse the connection stress between the rubber rings 19 and the spring plate 21, avoid the overload breakage of a single traction rod 20, improve the vibration and impact resistance of the mechanical seal mechanism, and adapt to the high-frequency operation of the pump.

[0047] The right side of the traction rod 20 is engaged with the spring plate 21 via the third limiting groove 23. The spring plate 21 has a three-layer structure and a semi-circular third limiting groove 23 on its side. Compared with the single-layer spring plate 21, the three-layer spring plate 21 has a larger elastic deformation range and more stable and durable elastic force. It can compensate for the gap between the sealing ring 18 and the static sealing ring 9 caused by long-term wear in real time, avoiding the problems of insufficient compensation force and easy fatigue failure of the traditional single-layer spring plate 21. The semi-circular third limiting groove 23 on the side of the spring plate 21 can reduce frictional damage to the traction rod 20 and extend the service life of the traction rod 20. At the same time, it can ensure that the elastic force of the spring plate 21 is accurately transmitted to the sealing ring 18, preventing uneven force on the sealing surface. Moreover, the engagement connection between the traction rod 20 and the spring plate 21 does not require additional fasteners, making assembly and disassembly convenient, saving disassembly and assembly time, and reducing maintenance difficulty.

[0048] The right side of the traction rod 20 is movably connected to the dynamic sealing ring 8 via the second sealing groove 7. A fourth limiting groove 24 is opened on the inner wall of the dynamic sealing ring 8, and a fourth sealing ring 15 is engaged in the groove. With this scheme, the movable connection between the traction rod 20 and the dynamic sealing ring 8 allows the dynamic sealing ring 8 to rotate synchronously with the impeller shaft, which is compatible with the working principle of the pump. At the same time, the second sealing groove 7 can seal the gap between the two, filling the design defect of easy leakage in traditional dynamic connections. The fourth limiting groove 24 on the inner wall of the dynamic sealing ring 8 can fix the fourth sealing ring 15 to prevent the fourth sealing ring 15 from being thrown off when the dynamic sealing ring 8 rotates at high speed. At the same time, the fourth sealing ring 15 can tightly fill the gap between the dynamic sealing ring 8 and the impeller shaft, forming a key dynamic sealing defense line against the shaft surface, and preventing the medium from leaking along the impeller shaft surface.

[0049] The right side of the dynamic sealing ring 8 is movably connected to the cover plate 4 via the first limiting groove 16; the left side of the cover plate 4 is fixed to the housing 1 by bolts, and ventilation holes 6 are opened on its surface, while heat dissipation grooves 5 are opened on its right side. With this design, the bolted connection between the cover plate 4 and the housing 1 forms a closed structure, which can prevent external dust, impurities, and moisture from entering the internal mechanical sealing mechanism, including the dynamic sealing ring 8, spring plate 21, sealing ring 18, and other components, thus avoiding accelerated wear or failure of the sealing components due to contamination. The connection between the dynamic sealing ring 8 and the first limiting groove 16 of the cover plate 4 can precisely constrain the axial displacement of the dynamic sealing ring 8, preventing it from being damaged by axial force. Excessive displacement from the sealing position ensures proper contact between the sealing surfaces of the dynamic sealing ring 8 and the static sealing ring 9. In addition, the ventilation holes 6 of the cover plate 4 can introduce cold air, and the heat dissipation grooves 5 can increase the heat dissipation area. The combination of these two can quickly remove the frictional heat of the sealing mechanism, reduce the temperature of components such as the first sealing ring 12, the second sealing ring 13, the third sealing ring 14, the fourth sealing ring 15, and the rubber ring 19, and extend their service life. At the same time, it avoids the change in medium viscosity caused by high temperature, which affects the sealing effect. Moreover, the bolted cover plate 4 is easy to disassemble and assemble, which greatly reduces the difficulty of maintenance and shortens the pump downtime for maintenance.

[0050] Working principle: When the impeller bearing hole sealing end cover in a pump structure is used, the four evenly arranged bolt interfaces 3 on the outer side of the housing 1 can firmly connect the end cover to the pump body, ensuring uniform force during assembly, avoiding deformation of the housing 1 or loosening of bolts caused by vibration, and providing stable structural support for sealing; at the same time, the first sealing groove 2 on the left side of the housing 1 and the fifth sealing ring 17 inside form an "outer side-inner side" pre-sealing defense line, which can block some media penetration in advance, reduce the pressure of the main sealing mechanism, and the three evenly distributed third sealing grooves 10 on the right side of the fifth sealing ring 17 and the fourth sealing groove 11 arranged parallel to the third sealing grooves 10 can provide precise positioning for subsequent sealing ring installation, ensuring that the sealing path is continuous and uninterrupted;

[0051] When the pump is running, the dynamic sealing ring 8 rotates synchronously with the impeller shaft. The static sealing ring 9 is fixed to the housing 1 by the first sealing ring 12 engaged in the fifth sealing ring 17 and the second sealing ring 13 engaged in the third sealing groove 10. The two form a "dynamic-static" sealing pair, which directly prevents the medium from leaking from the shaft surface. In addition, the second sealing ring 13 engaged on the right side of the sealing ring 18, the third sealing ring 14 fixed on the right side of the sealing ring 18, and the fourth sealing ring 15 engaged in the fourth limiting groove 24 on the inner wall of the dynamic sealing ring 8 together form a multi-stage sealing barrier, which completely seals the gaps between the components. The movable connection between the static sealing ring 9 and the sealing ring 18 can adapt to the slight deformation of the sealing ring 18 caused by temperature and pressure changes, and avoid wear on the sealing surfaces of the static sealing ring 9 and the sealing ring 18 caused by rigid connection.

[0052] The three-layer spring plate 21 engages with the traction rod 20 through the semi-circular third limiting groove 23 on the side. Then, through eight evenly distributed traction rods 20 and four evenly distributed rubber rings 19 with staggered through grooves on their surfaces, it transmits uniform elastic force to the sealing ring 18, ensuring that the sealing ring 18 and the static sealing ring 9 are always tightly fitted. When wear gaps appear on the sealing surface after long-term operation, the elastic deformation of the spring plate 21 can compensate in real time to avoid sealing failure. At the same time, the traction rod 20 can disperse the connection stress between the rubber ring 19 and the spring plate 21. The through groove of the rubber ring 19 can also provide buffer space for its own deformation and assist in heat dissipation, improving the vibration and impact resistance of the mechanical seal mechanism and adapting to the high-frequency operation of the pump. At the same time, the compression of the spring plate 21 pulls the rubber ring 19, pressing the force down to the third sealing ring 14, causing the third sealing ring 14 to contract, indirectly improving the sealing performance.

[0053] The cover plate 4 is bolted to the housing 1 on the left side to form a closed structure, which can prevent external dust, impurities and moisture from entering the internal mechanical seal mechanism, including the dynamic sealing ring 8, spring plate 21, sealing ring 18 and other components, and avoid the sealing components from being worn or failing due to contamination. The ventilation holes 6 on the surface of the cover plate 4 can introduce cold air, and the heat dissipation grooves 5 on the right side of the cover plate 4 can increase the heat dissipation area. The two work together to quickly remove the frictional heat of the sealing mechanism, reduce the temperature of the first sealing ring 12, second sealing ring 13, third sealing ring 14, fourth sealing ring 15, rubber ring 19 and other components, and prevent the components from aging due to high temperature. In addition, the dynamic sealing ring 8 is movably connected to the cover plate 4 on the right side through the first limiting groove 16, which can accurately constrain the axial displacement of the dynamic sealing ring 8 and ensure that it is always accurately in contact with the sealing surface of the static sealing ring 9.

[0054] The traction rod 20 and the spring plate 21 are engaged and connected by the third limiting groove 23 without the need for additional fasteners. They can be directly engaged during assembly and quickly separated during disassembly, saving assembly and disassembly time. The cover plate 4 is bolted to the housing 1, and the cover plate 4 can be opened simply by unscrewing the bolts. This makes it easy to replace internal components such as the aging first sealing ring 12, second sealing ring 13, third sealing ring 14, fourth sealing ring 15, or damaged spring plate 21, which greatly shortens the pump's downtime for maintenance and improves equipment operation and maintenance efficiency.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing end cover for an impeller bearing hole in a pump structure, comprising a housing (1); characterized in that: The housing (1) is provided with a mechanical sealing mechanism, which includes a third sealing ring (14), a sealing ring (18), a rubber ring (19), a traction rod (20), a spring plate (21), and a dynamic sealing ring (8). The third sealing ring (14), the rubber ring (19), the spring plate (21), and the dynamic sealing ring (8) are arranged sequentially on the right side of the sealing ring (18). The rubber ring (19) is installed on the left side of the traction rod (20).

2. The impeller bearing hole sealing end cover in a pump structure according to claim 1, characterized in that, The housing (1) has a first sealing groove (2) on the left side, and a bolt interface (3) is provided on the outside of the housing (1). There are four bolt interfaces (3) evenly arranged. The housing (1) has a fifth sealing ring (17) inside, and a third sealing groove (10) is provided on the right side of the fifth sealing ring (17). There are three third sealing grooves (10) evenly distributed. A fourth sealing groove (11) is arranged parallel to the right side of the third sealing groove (10).

3. The impeller bearing hole sealing end cover in a pump structure according to claim 2, characterized in that, The first sealing ring (12) is engaged in the fifth sealing ring (17), the second sealing ring (13) is engaged in the third sealing groove (10), the housing (1) is engaged in the static sealing ring (9) through the first sealing ring (12) and the second sealing ring (13), and the right side of the static sealing ring (9) is movably connected to the sealing ring (18).

4. The impeller bearing hole sealing end cover in a pump structure according to claim 3, characterized in that, The sealing ring (18) is engaged with the second sealing ring (13) on the right side, and the sealing ring (18) is fixedly connected with the third sealing ring (14) on the right side. The third sealing ring (14) has a second limiting groove (22) on the right side. The second limiting groove (22) is movably connected with a rubber ring (19). There are four rubber rings (19) evenly distributed, and the surface of the rubber rings (19) has staggered through grooves. The right side of the rubber rings (19) is fixedly connected with a traction rod (20). There are eight traction rods (20) evenly distributed.

5. The impeller bearing hole sealing end cover in a pump structure according to claim 4, characterized in that, The right side of the traction rod (20) is engaged with the spring plate (21) through the third limiting groove (23). The spring plate (21) has a three-layer structure, and the third limiting groove (23) is opened on the side of the spring plate (21). The third limiting groove (23) is a semi-circular structure.

6. The impeller bearing hole sealing end cover in a pump structure according to claim 5, characterized in that, The right side of the traction rod (20) is movably connected to the dynamic sealing ring (8) through the second sealing groove (7). The inner wall of the dynamic sealing ring (8) is provided with a fourth limiting groove (24), and the fourth sealing ring (15) is engaged and connected in the fourth limiting groove (24).

7. The impeller bearing hole sealing end cover in a pump structure according to claim 6, characterized in that, The right side of the dynamic sealing ring (8) is movably connected to the cover plate (4) through the first limiting groove (16). The left side of the cover plate (4) is bolted to fix the housing (1). Ventilation holes (6) are opened on the surface of the cover plate (4). Heat dissipation grooves (5) are opened on the right side of the cover plate (4).

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