Multi-sealing leakage-proof mechanism for shaft cover of water pump

Abstract

The utility model discloses a multi-sealing leakage-proof mechanism for a shaft cover of a water pump. The sealing structure comprises a shaft cover connection sealing structure, a shaft end sealing leakage-proof structure and a cover end sealing leakage-proof structure which are installed on a pump cover, a shaft hole is formed in the middle of the pump cover, a transmission shaft is installed in the shaft hole in a penetrating mode, the shaft cover connection sealing structure is installed at the upper end of the pump cover, and the shaft end sealing leakage-proof structure is installed in the shaft cover connection sealing structure. The cover end sealing leakage-proof structure is installed at the lower end of the pump cover. The sealing structure has the advantages that the shaft cover connection sealing structure, the shaft end sealing leakage-proof structure and the cover end sealing leakage-proof structure form a multi-sealing leakage-proof structure, installation and operation are convenient and fast, the sealing structure combination is tight and firm, the comprehensive and continuous lubrication function is provided, the excellent no-load operation resisting capacity is achieved, and the sealing structure has the good sealing effect. The sealing failure caused by damage due to dry burning during long-time liquid-deficient no-load operation is avoided, and the problem that a sealing structure is burnt out during water-deficient no-load operation of an existing water pump is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pump body sealing structures, and more specifically, especially relates to a multi-seal anti-leakage mechanism for a water pump shaft cover. Background Art

[0002] A water pump is a production application mechanical device for liquid transportation or liquid pressurization. There are various types of water pumps. The basic working principle of a water pump is that a rotating impeller is driven to rotate by a motor or other driving devices, and the rotational mechanical energy is converted into a negative pressure suction kinetic energy that drives the liquid to flow, so as to achieve the purpose of transporting the liquid from the supply end to the liquid-using end.

[0003] The structure of a water pump includes a motor, a coupling, an impeller, and a pump body. The motor drives the impeller installed in the pump body to rotate through the coupling, realizing the suction and drainage of the liquid. The existing pump body is provided with a single sealing structure at the combination of the pump body and the coupling to prevent the liquid from leaking during the pumping process. However, in the actual production application process, since the sealing structure is prone to wear when rotating with the coupling, the sealing performance is damaged, the service life is shortened, resulting in seal failure. And when encountering the situation of continuous no-load and liquid-deficient operation, it will cause dry grinding of the sealing structure, and the sealing contact end will directly dry-burn and wear, affecting the service life of the water pump. Just running without load and lacking liquid for 1 - 2 minutes, the sealing structure will burn out and completely lose the sealing function. In subsequent operations, liquid leakage will occur at the shaft cover combination, resulting in the abnormal operation of the liquid-using equipment and the entire production system, affecting the production efficiency of the enterprise and increasing the production and maintenance costs of the enterprise.

[0004] In view of this, the existing water pump structure is prone to leakage problems during application. Therefore, it is necessary to design a new effective sealing mechanism for the shaft cover end of the water pump to meet the production and use requirements of the enterprise. Summary of the Invention

[0005] The purpose of the utility model is to provide a multi-seal anti-leakage mechanism for a water pump shaft cover, which is used to solve the problem that the existing water pump structure is prone to wear and cause water leakage in actual application.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] A multi-seal anti-leakage mechanism for a water pump shaft cover, comprising a shaft cover connection and sealing structure, a shaft end sealing and anti-leakage structure, and a cover end sealing and anti-leakage structure installed on the pump cover. A shaft hole is opened in the middle of the pump cover, and a transmission shaft is installed through the shaft hole. The shaft cover connection and sealing structure is installed at one end of the pump cover, the shaft end sealing and anti-leakage structure is installed inside the shaft cover connection and sealing structure, and the cover end sealing and anti-leakage structure is installed at the other end of the pump cover. The shaft end sealing and anti-leakage structure and the transmission shaft form a shaft end sealing structure, and the cover end sealing and anti-leakage structure and the transmission shaft form a cover end sealing structure. The shaft cover connection and sealing structure, the shaft end sealing and anti-leakage structure, the cover end sealing and anti-leakage structure, the pump cover, and the transmission shaft form a shaft cover lubrication and sealing structure, which solves the problem that the seal of the water pump is easily damaged and leaked during operation, ensures the normal operation of the water pump, extends the service life of the water pump, reduces the maintenance of the water pump, and reduces the use cost of the user.

[0008] Preferably, the shaft cover sealing cover body of the shaft cover connection and sealing structure is installed on the transmission shaft through the transmission shaft installation hole. An oil storage lubrication and sealing cavity is provided inside the shaft cover sealing cover body. The shaft end static seal ring of the shaft end sealing and anti-leakage structure is installed inside the transmission shaft installation hole. A sealing oil injection structure is provided on the outer wall of the shaft cover sealing cover body. The shaft end static seal ring and the shaft end dynamic seal ring of the shaft end sealing and anti-leakage structure are mutually attached and installed on the transmission shaft. The shaft end dynamic seal ring is locked and fixed on the transmission shaft. The shaft cover sealing cover body is installed on the end face of the pump cover. A sealing gasket is provided between the shaft cover sealing cover body and the end face of the pump cover. The cover end static seal ring of the cover end sealing and anti-leakage structure is installed on the side of the shaft hole of the pump cover facing the impeller combination. The cover end static seal ring and the cover end dynamic seal ring of the cover end sealing and anti-leakage structure are mutually attached and installed on the shaft neck of the extended end of the transmission shaft on the pump cover. The cover end dynamic seal ring is locked and fixed on the transmission shaft. Elastic sealing structures are provided on the inner walls of the shaft end dynamic seal ring and the cover end dynamic seal ring. The elastic sealing structures and the outer wall of the transmission shaft are mutually sealed and attached. The shaft end dynamic seal ring, the cover end dynamic seal ring, and the transmission shaft rotate synchronously.

[0009] Preferably, an axial end static seal ring mounting groove is provided inside the transmission shaft mounting hole. An axial end seal rubber ring is provided on the outer wall of the axial end static seal ring. The axial end static seal ring is fixedly mounted in the axial end static seal ring mounting groove through the axial end seal rubber ring. The axial end seal rubber ring and the axial end static seal ring mounting groove are in an interference fit combination. The axial end dynamic seal ring and the axial end elastic support limit lock ring of the axial end dynamic seal ring part are mounted on the journal of the transmission shaft. An axial end seal ring is mounted inside the axial end dynamic seal ring. The inner sealing surface of the axial end seal ring is in contact with and fits against the outer wall of the transmission shaft. The axial end seal ring and the outer wall of the transmission shaft are in an interference fit. The axial end dynamic seal contact end face of the dynamic seal end of the axial end dynamic seal ring and the axial end static seal contact end face of the static seal end of the axial end static seal ring are in slidable contact with each other. An axial end elastic support mechanism is mounted inside the axial end elastic support limit lock ring. The axial end elastic support mechanism is in contact with and fits against the support end of the axial end dynamic seal ring. The axial end elastic support limit lock ring and the axial end dynamic seal ring are rotationally combined synchronously through an axial end limit structure. A first locking mechanism is provided on the outer side of the axial end elastic support limit lock ring. The first locking mechanism locks and mounts the axial end elastic support limit lock ring on the transmission shaft. The axial end elastic support limit lock ring compresses the axial end elastic support mechanism to make the axial end dynamic seal ring and the axial end static seal ring fit tightly together. The combination of the axial end seal ring and the transmission shaft forms an axial end seal. A cover end static seal ring mounting groove is provided on the side of the shaft hole facing the impeller combination. A cover end seal rubber ring is provided on the outer wall of the cover end static seal ring. The cover end static seal ring is mounted in the cover end static seal ring mounting groove through the cover end seal rubber ring. The cover end seal rubber ring and the cover end static seal ring mounting groove are in an interference fit combination. The cover end dynamic seal ring and the cover end elastic limit locking ring of the cover end dynamic seal ring part are mounted on the journal of the extended end of the pump cover of the transmission shaft. A cover end seal ring is mounted inside the cover end dynamic seal ring. The inner sealing surface of the cover end seal ring is in contact with and fits against the outer wall of the transmission shaft. The cover end seal ring and the outer wall of the transmission shaft are in an interference fit. The combination of the cover end seal ring and the transmission shaft forms a cover end seal. The cover end dynamic seal contact end face of the dynamic seal end of the cover end dynamic seal ring and the cover end static seal contact end face of the static seal end of the cover end static seal ring are in slidable contact with each other. The cover end elastic limit locking ring is arranged in contact with the cover end dynamic seal ring. A cover end elastic support mechanism is mounted inside the cover end elastic limit locking ring. The support end of the cover end elastic support mechanism abuts against the contact end of the cover end elastic limit locking ring. The cover end elastic support mechanism pushes the cover end dynamic seal ring upward to make the cover end dynamic seal ring and the cover end static seal ring fit tightly together. A second locking mechanism is provided on the outer side of the cover end elastic limit locking ring. The second locking mechanism locks and mounts the cover end elastic limit locking ring on the transmission shaft.The cover end dynamic seal ring and the cover end elastic limit locking ring are rotationally combined synchronously through the cover end limit structure.

[0010] Preferably, a positioning boss is provided on the combined end face of the shaft hole of the pump cover, and a combined positioning opening is formed at the installation end of the shaft cover sealing cover body. The positioning boss and the combined positioning opening are in an embedded positioning fit with each other, so that the shaft cover sealing cover body can be installed on the pump cover more accurately, tightly and stably.

[0011] Preferably, an auxiliary sealing groove is formed on the combined end face of the pump cover outside the positioning boss. The sealing gasket is embedded and installed in the auxiliary sealing groove. The shape of the auxiliary sealing groove is the same as that of the sealing gasket. When installing, the sealing gasket is snapped into the auxiliary sealing groove, which improves the installation combination accuracy of the sealing gasket and will not shift during installation, enabling the sealing gasket to fit better with the shaft cover sealing cover body and the pump cover, and achieving a better auxiliary sealing and leak prevention effect.

[0012] Preferably, combined threaded holes are equidistantly arrayed at the installation end of the outer wall of the shaft cover sealing cover body, combined through holes aligned with the combined threaded holes are formed outside the shaft hole, and installation holes aligned with the combined threaded holes are formed on the sealing gasket. The locking component passes through the combined through holes and the installation holes and then combines with the combined threaded holes to lock and install the shaft cover sealing cover body on the pump cover.

[0013] Preferably, the shaft end elastic support mechanism includes a shaft end dynamic ring elastic support component and a shaft end dynamic ring support ring. The shaft end dynamic ring elastic support component is placed in the shaft end elastic support limit lock ring, the shaft end dynamic ring support ring is placed at the elastic support end of the shaft end dynamic ring elastic support component, the shaft end dynamic ring support ring is in supporting contact with the shaft end dynamic seal ring, the shaft end dynamic ring support ring is clamped at the limit end of the shaft end limit structure, and the upward movement position of the shaft end dynamic ring support ring is restricted by the shaft end limit structure. The cover end elastic support mechanism includes a cover end dynamic ring elastic support component and a cover end dynamic ring support ring. The cover end dynamic ring elastic support component is placed in the cover end elastic limit locking ring, the cover end dynamic ring support ring is placed at the elastic support end of the cover end dynamic ring elastic support component, the cover end dynamic ring support ring is in supporting contact with the cover end dynamic seal ring, the cover end dynamic ring support ring is clamped at the limit end of the cover end limit structure, and the upward movement position of the cover end dynamic ring support ring is restricted by the cover end limit structure.

[0014] Preferably, the shaft-end limiting structure includes a shaft-end combined positioning groove formed on the outer side of the shaft-end dynamic seal ring. An inner side of the shaft-end elastic support limiting lock ring is provided with a shaft-end combined limiting protrusion that cooperates with the shaft-end combined positioning groove. The shaft-end combined limiting protrusion and the shaft-end combined positioning groove are combined in a limiting manner, so that the shaft-end elastic support limiting lock ring drives the shaft-end dynamic seal ring to rotate synchronously with the transmission shaft. The cover-end limiting structure includes a cover-end combined positioning groove formed on the outer side of the cover-end dynamic seal ring. An inner side of the cover-end elastic limiting lock ring is provided with a cover-end combined limiting protrusion that cooperates with the cover-end combined positioning groove. The combined limiting protrusion and the combined positioning groove are combined, so that the cover-end elastic limiting lock ring drives the cover-end dynamic seal ring to rotate synchronously with the transmission shaft.

[0015] Preferably, the seal oil injection structure includes an oil injection hole and an oil hole sealing plug. The oil injection hole is formed on an outer wall of the shaft cover sealing body, and the oil hole sealing plug is installed in the oil injection hole. When it is necessary to inject sealed lubricating oil, only need to screw out the oil hole sealing plug, and the sealed lubricating oil can be injected and supplemented into the oil storage lubrication seal cavity through the oil injection hole.

[0016] Preferably, the shaft-end static seal contact end face and the cover-end static seal contact end face are silicon carbide static seal contact end faces, and the shaft-end dynamic seal contact end face and the cover-end dynamic seal contact end face are stainless steel alloy dynamic seal contact end faces. When the shaft-end static seal ring rotates in contact with the shaft-end elastic dynamic seal ring and the cover-end static seal ring rotates in contact with the cover-end dynamic seal ring, the friction is reduced, ensuring smooth rotation, prolonging the service life of the shaft-end seal leak-proof structure and the cover-end seal leak-proof structure, and improving the seal leak-proof performance of the shaft-end seal leak-proof structure and the cover-end seal leak-proof structure. A rotation gap is left between the transmission shaft and the transmission shaft installation hole, the shaft-end transmission shaft combined hole of the shaft-end static seal ring, and the cover-end transmission shaft combined hole of the cover-end static seal ring, so that when the transmission shaft of the water pump runs and rotates, it will not contact and rub against the shaft-end static seal ring and the cover-end static seal ring, maintaining the normal operation of the equipment and enabling the system to work smoothly.

[0017] Preferably, the sealing gasket is a PTFE sealing gasket. The PTFE sealing gasket has the effects of corrosion resistance, high pressure resistance and high temperature resistance, and can provide a more ideal and lasting seal leak-proof effect for the combined structure between the shaft cover sealing body and the pump cover.

[0018] Compared with the prior art, the advantages of the present utility model include:

[0019] The utility model forms a multi - layer sealing and leakage - prevention structure at the combination of the shaft cover of the water pump through the shaft - end sealing structure, the cover - end sealing structure and the shaft - cover lubricating and sealing structure, solves the problem that the sealing of the water pump is easily damaged and leaked during operation, ensures the normal operation of the water pump, prolongs the service life of the water pump, reduces the maintenance of the water pump, and reduces the use cost of the user.

[0020] The shaft - cover sealing cover body of the utility model adopts an integral - structure design, which is simple and practical, convenient for processing and production, has a low processing cost, is convenient for installation and later maintenance, has a better sealing effect and a longer working life, and forms a comprehensive and reliable sealing, lubricating and leakage - prevention mechanism in combination with the shaft - end sealing and leakage - prevention structure and the cover - end sealing and leakage - prevention structure.

[0021] The shaft - cover connection sealing structure, the shaft - end sealing and leakage - prevention structure and the cover - end sealing and leakage - prevention structure designed by the utility model are convenient for installation and operation. The formed sealing structure combinations are tightly and firmly combined, and the sealing oil stored in the oil - storage lubricating and sealing cavity provides comprehensive and continuous lubrication for the shaft - cover connection sealing structure and the shaft - end sealing and leakage - prevention structure. It has excellent no - load operation resistance. Even when the water pump and the inlet pipeline are running without liquid for a long time, the shaft - cover connection sealing structure and the shaft - end sealing and leakage - prevention structure can be effectively lubricated, and there will be no dry - burning and damage, resulting in sealing failure, so that the water pump can work normally for a long time, ensuring that the liquid - using equipment and the production system can run continuously, and effectively solving the problem that the existing water pump will burn out the sealing structure when running without water under no - load. Brief Description of the Drawings

[0022] Figure 1 is the schematic diagram of the combined state of the utility model.

[0023] Figure 2 is the schematic diagram of the bottom of the combined state of the utility model.

[0024] Figure 3 is the structural schematic diagram of the utility model.

[0025] Figure 4 is the schematic diagram of the internal structure of the utility model.

[0026] Figure 5 is the sectional structural schematic diagram of the shaft - cover sealing cover body of the utility model.

[0027] Figure 6 is the schematic diagram of the shaft - cover connection sealing structure of the utility model.

[0028] Figure 7 is the exploded schematic diagram of the shaft - cover connection sealing structure of the utility model.

[0029] Figure 8 is the exploded schematic diagram of the shaft - end sealing and leakage - prevention structure of the utility model.

[0030] Figure 9 It is a schematic cross-sectional view of the shaft-end sealing anti-leakage structure of the present utility model.

[0031] Figure 10 It is a schematic diagram of the pump cover structure of the present utility model.

[0032] Figure 11 It is an exploded schematic view of the cover-end sealing anti-leakage structure of the present utility model.

[0033] Figure 12 It is a schematic cross-sectional view of the cover-end sealing anti-leakage structure of the present utility model.

[0034] Figure 13 It is a schematic cross-sectional view of the combination of the shaft cover sealing cover body and the sealing gasket of the second embodiment of the present utility model.

[0035] Figure 14 It is a schematic diagram of the internal structure of the third embodiment of the present utility model.

[0036] Explanation of the reference numerals in the drawings:

[0037] Shaft cover connection sealing structure - 1, shaft-end sealing anti-leakage structure - 2, cover-end sealing anti-leakage structure - 3, pump cover - 4, transmission shaft - 5, shaft cover sealing cover body - 11, sealing gasket - 12, transmission shaft mounting hole - 13, oil storage lubrication sealing cavity - 14, sealing oil injection structure - 15, shaft-end static seal ring mounting groove - 16, combined positioning opening - 17, combined threaded hole - 111, mounting hole - 121, oil injection hole - 151, oil hole sealing plug - 152, shaft-end static seal ring - 21, shaft-end dynamic seal ring - 22, shaft-end elastic support limit locking ring - 23, shaft-end elastic support mechanism - 24, shaft-end limit structure - 25, shaft-end sealing rubber ring - 211, shaft-end sealing ring - 221, shaft-end combined positioning groove - 222, shaft-end combined limit protrusion - 231, first locking mechanism - 232, shaft-end dynamic ring elastic support component - 241, shaft-end dynamic ring support ring - 242, cover-end static seal ring - 31, cover-end dynamic seal ring - 32, cover-end elastic limit locking ring - 33, cover-end elastic support mechanism - 34, cover-end limit structure - 35, cover-end sealing rubber ring - 311, cover-end sealing ring - 321, cover-end combined positioning groove - 322, cover-end combined limit protrusion - 331, second locking mechanism - 332, cover-end dynamic ring elastic support component - 341, cover-end dynamic ring support ring - 342, positioning boss - 41, combined through hole - 42, auxiliary sealing groove - 43, cover-end static seal ring mounting groove - 44. Detailed implementation manners

[0038] The present utility model will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0039] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] The present utility model will be further described below in conjunction with specific embodiments and the attached drawings:

[0041] Figures 1-14 is a structural auxiliary schematic diagram of the present utility model. As Figures 1-14 shown, the present utility model is a multi-seal anti-leakage mechanism for a water pump shaft cover, including a shaft cover connection sealing structure 1, a shaft end sealing anti-leakage structure 2, and a cover end sealing anti-leakage structure 3 installed on the pump cover 4. A shaft hole is opened in the middle of the pump cover 4, and a transmission shaft 5 is installed through the shaft hole. The shaft cover connection sealing structure 1 is installed at one end of the pump cover 4, the shaft end sealing anti-leakage structure 2 is installed in the shaft cover connection sealing structure 1, the cover end sealing anti-leakage structure 3 is installed at the other end of the pump cover 4. The shaft end sealing anti-leakage structure 2 and the transmission shaft 5 form a shaft end sealing structure, the cover end sealing anti-leakage structure 3 and the transmission shaft 5 form a cover end sealing structure. The shaft cover connection sealing structure 1, the shaft end sealing anti-leakage structure 2, the cover end sealing anti-leakage structure 3, the pump cover 4, and the transmission shaft 5 form a shaft cover lubrication and sealing structure, which solves the problem that the water pump is prone to seal damage and leakage during operation, ensures the normal operation of the water pump, extends the service life of the water pump, reduces the maintenance of the water pump, and reduces the use cost of the user.

[0042] Preferably, the shaft cover sealing cover body 11 of the shaft cover connection sealing structure 1 is installed on the transmission shaft 5 through the transmission shaft mounting hole 13. An oil storage lubrication and sealing cavity 14 is provided inside the shaft cover sealing cover body 11. The shaft end static seal ring 21 of the shaft end seal and leakage prevention structure 2 is installed inside the transmission shaft mounting hole 13. A seal oil injection structure 15 is provided on the outer wall of the shaft cover sealing cover body 11. The shaft end static seal ring 21 and the shaft end dynamic seal ring part of the shaft end seal and leakage prevention structure 2 are mutually attached and installed on the transmission shaft 5. The shaft end dynamic seal ring part is locked and fixedly installed on the transmission shaft 5. The shaft cover sealing cover body 11 is installed on the end face of the pump cover 4. A sealing gasket 12 is provided between the shaft cover sealing cover body 11 and the end face of the pump cover 4. The cover end static seal ring 31 of the cover end seal and leakage prevention structure 3 is installed on the side of the shaft hole of the pump cover 4 facing the impeller combination. The cover end static seal ring 31 and the cover end dynamic seal ring part of the cover end seal and leakage prevention structure 3 are mutually attached and installed on the shaft neck of the extended end of the transmission shaft 5 on the pump cover 4. The cover end dynamic seal ring part is locked and fixedly installed on the transmission shaft 5. Elastic sealing structures are provided on the inner walls of the shaft end dynamic seal ring part and the cover end dynamic seal ring part. The elastic sealing structures are hermetically attached and combined with the outer wall of the transmission shaft 5. The shaft end dynamic seal ring part, the cover end dynamic seal ring part and the transmission shaft 5 rotate synchronously.

[0043] Preferably, an axial end static seal ring installation groove 16 is provided inside the transmission shaft installation hole 13. An axial end seal rubber ring 211 is provided on the outer wall of the axial end static seal ring 21. The axial end static seal ring 21 is fixedly installed in the axial end static seal ring installation groove 16 through the axial end seal rubber ring 211. The axial end seal rubber ring 211 and the axial end static seal ring installation groove 16 are in an interference fit combination. The axial end dynamic seal ring 22 and the axial end elastic support limit lock ring 23 of the axial end dynamic seal ring part are installed on the journal of the transmission shaft 5. An axial end seal ring 221 is installed inside the axial end dynamic seal ring 22. The inner sealing surface of the axial end seal ring 221 is attached to the outer wall of the transmission shaft 5. The axial end seal ring 221 and the outer wall of the transmission shaft 5 are in an interference fit. The axial end dynamic seal contact end surface of the dynamic seal end of the axial end dynamic seal ring 22 and the axial end static seal contact end surface of the static seal end of the axial end static seal ring 21 are in slidable contact with each other. An axial end elastic support mechanism 24 is installed inside the axial end elastic support limit lock ring 23. The axial end elastic support mechanism 24 is attached and installed at the support end of the axial end dynamic seal ring 22. The axial end elastic support limit lock ring 23 and the axial end dynamic seal ring 22 are rotationally combined synchronously through an axial end limit structure 25. A first locking mechanism 232 is provided on the outer side of the axial end elastic support limit lock ring 23. The first locking mechanism 232 locks and installs the axial end elastic support limit lock ring 23 on the transmission shaft 5. The axial end elastic support limit lock ring 23 compresses the axial end elastic support mechanism 24 to make the axial end dynamic seal ring 22 and the axial end static seal ring 21 fit tightly together. The combination of the axial end seal ring 221 and the transmission shaft 5 forms an axial end seal. A cover end static seal ring installation groove 44 is opened on the side of the shaft hole facing the impeller combination. A cover end seal rubber ring 311 is provided on the outer wall of the cover end static seal ring 31. The cover end static seal ring 31 is installed in the cover end static seal ring installation groove 44 through the cover end seal rubber ring 311. The cover end seal rubber ring 311 and the cover end static seal ring installation groove 44 are in an interference fit combination. The cover end dynamic seal ring 32 and the cover end elastic limit locking ring 33 of the cover end dynamic seal ring part are installed on the journal of the protruding end of the pump cover 4 of the transmission shaft 5. A cover end seal ring 321 is installed inside the cover end dynamic seal ring 32. The inner sealing surface of the cover end seal ring 321 is attached to the outer wall of the transmission shaft 5. The cover end seal ring 321 and the outer wall of the transmission shaft 5 are in an interference fit. The combination of the cover end seal ring 321 and the transmission shaft 5 forms a cover end seal. The cover end dynamic seal contact end surface of the dynamic seal end of the cover end dynamic seal ring 32 and the cover end static seal contact end surface of the static seal end of the cover end static seal ring 31 are in slidable contact with each other. The cover end elastic limit locking ring 33 and the cover end dynamic seal ring 32 are arranged in a fitting manner. A cover end elastic support mechanism 34 is installed inside the cover end elastic limit locking ring 33.The supporting end of the cover-end elastic support mechanism 34 abuts against the contact end of the cover-end elastic limit locking ring 33. The cover-end elastic support mechanism 34 pushes the cover-end dynamic sealing ring 32 upwards so that the cover-end dynamic sealing ring 32 is in close fit with the cover-end static sealing ring 31. A second locking mechanism 332 is provided on the outer side of the cover-end elastic limit locking ring 33. The second locking mechanism 332 locks and installs the cover-end elastic limit locking ring 33 on the transmission shaft 5. The cover-end dynamic sealing ring 32 and the cover-end elastic limit locking ring 33 are rotationally combined synchronously through the cover-end limit structure 35.

[0044] Preferably, a positioning boss 41 is provided on the combined end face of the shaft hole of the pump cover 4. A combined positioning opening 17 is formed at the installation end of the shaft cover sealing cover body 11. The positioning boss 41 and the combined positioning opening 17 are in an embedded positioning fit with each other, so that the shaft cover sealing cover body 11 can be installed on the pump cover 4 more accurately, tightly and stably.

[0045] Preferably, an auxiliary sealing groove 43 is formed on the combined end face of the pump cover 4 outside the positioning boss 41. The sealing gasket 12 is embedded and installed in the auxiliary sealing groove 43. The shape of the auxiliary sealing groove 43 is the same as that of the sealing gasket 12. When installing, the sealing gasket 12 is snapped into the auxiliary sealing groove 43 to improve the installation and combination accuracy of the sealing gasket 12. The sealing gasket 12 will not shift during installation, enabling the sealing gasket 12 to fit better with the shaft cover sealing cover body 11 and the pump cover 4, and achieving a better auxiliary sealing and leak prevention effect.

[0046] Preferably, combined threaded holes 111 are equidistantly arrayed at the installation end of the outer wall of the shaft cover sealing cover body 11. Combined through holes 42 aligned with the combined threaded holes 111 are formed outside the shaft hole. The sealing gasket 12 is provided with installation holes 121 aligned with the combined threaded holes 111. After the locking member passes through the combined through holes 42 and the installation holes 121, it is combined with the combined threaded holes 111 to lock and install the shaft cover sealing cover body 11 on the pump cover 4.

[0047] Preferably, the shaft-end elastic support mechanism 24 includes a shaft-end moving-ring elastic support component 241 and a shaft-end moving-ring support ring 242. The shaft-end moving-ring elastic support component 241 is placed within the shaft-end elastic support limit lock ring 22. The shaft-end moving-ring support ring 242 is placed at the elastic support end of the shaft-end moving-ring elastic support component 241. The shaft-end moving-ring support ring 242 is in supporting contact with the shaft-end dynamic seal ring 22. The shaft-end moving-ring support ring 242 is clamped at the limit end of the shaft-end limit structure 25. The upward movement position of the shaft-end moving-ring support ring 242 is restricted by the shaft-end limit structure 25. The cover-end elastic support mechanism 34 includes a cover-end moving-ring elastic support component 341 and a cover-end moving-ring support ring 342. The cover-end moving-ring elastic support component 341 is placed within the cover-end elastic limit locking ring 33. The cover-end moving-ring support ring 342 is placed at the elastic support end of the cover-end moving-ring elastic support component 341. The cover-end moving-ring support ring 342 is in supporting contact with the cover-end dynamic seal ring 32. The cover-end moving-ring support ring 342 is clamped at the limit end of the cover-end limit structure 35. The upward movement position of the cover-end moving-ring support ring 342 is restricted by the cover-end limit structure 35.

[0048] Preferably, the shaft-end limit structure 25 includes a shaft-end combined positioning groove 222 formed on the outer side of the shaft-end dynamic seal ring 22. On the inner side of the shaft-end elastic support limit lock ring 23, there is a shaft-end combined limit projection 231 that cooperates with the shaft-end combined positioning groove 222. The shaft-end combined limit projection 231 and the shaft-end combined positioning groove 222 are in limit combination, enabling the shaft-end elastic support limit lock ring 23 to drive the shaft-end dynamic seal ring 22 to rotate synchronously with the transmission shaft 5. The cover-end limit structure 35 includes a cover-end combined positioning groove 322 formed on the outer side of the cover-end dynamic seal ring 32. On the inner side of the cover-end elastic limit locking ring 33, there is a cover-end combined limit projection 331 that cooperates with the cover-end combined positioning groove 322. The combined limit projection 331 and the combined positioning groove 322 are combined, enabling the cover-end elastic limit locking ring 33 to drive the cover-end dynamic seal ring 32 to rotate synchronously with the transmission shaft 5.

[0049] Preferably, the seal oil injection structure 15 includes an oil injection hole 151 and an oil hole sealing plug 152. The oil injection hole 151 is formed on the outer wall of the shaft cover sealing body 11. The oil hole sealing plug 152 is installed in the oil injection hole 151. When it is necessary to inject sealed lubricating oil, simply unscrew the oil hole sealing plug 152, and the sealed lubricating oil can be injected and replenished into the oil storage lubrication seal cavity through the oil injection hole 151.

[0050] Preferably, the shaft-end static-sealing contact end face and the cover-end static-sealing contact end face are silicon carbide static-sealing contact end faces, and the shaft-end dynamic-sealing contact end face and the cover-end dynamic-sealing contact end face are stainless steel alloy dynamic-sealing contact end faces. When the shaft-end static-sealing ring 21 rotates in contact with the shaft-end elastic dynamic-sealing ring 22 and the cover-end static-sealing ring 31 rotates in contact with the cover-end dynamic-sealing ring 32, friction is reduced, ensuring smooth rotation, prolonging the service life of the shaft-end seal leak-proof structure 2 and the cover-end seal leak-proof structure 3, and improving the seal leak-proof performance of the shaft-end seal leak-proof structure 2 and the cover-end seal leak-proof structure 3. A rotational clearance is provided between the transmission shaft 5, the transmission shaft mounting hole 13, the shaft-end transmission shaft combination hole of the shaft-end static-sealing ring 21, and the cover-end transmission shaft combination hole of the cover-end static-sealing ring 31, so that when the transmission shaft 5 of the water pump rotates, it will not come into contact friction interference with the shaft-end static-sealing ring 21 and the cover-end static-sealing ring 31, maintaining the normal operation of the equipment and enabling the system to work smoothly.

[0051] Preferably, the sealing gasket 12 is a PTFE sealing gasket. The PTFE sealing gasket has corrosion resistance, high pressure resistance, and high temperature resistance effects, and can provide a more ideal and durable seal leak-proof effect for the combined structure between the shaft cover sealing cover body 11 and the pump cover 4.

[0052] First embodiment:

[0053] During installation, first embed and snap the shaft-end static-sealing ring 21 into the shaft-end static-sealing ring installation groove 16, and embed and snap the cover-end static-sealing ring 31 into the cover-end static-sealing ring installation groove 44.

[0054] Install the shaft cover sealing cover body 11, the shaft end elastic dynamic sealing ring 22, and the support limit locking ring 23 onto the upper shaft neck of the transmission shaft 5 in sequence. Fix the support limit locking ring 23 at the support limit position of the transmission shaft 5 by tightening the first locking mechanism 232. Place the sealing gasket 12 on the pump cover 4. Press down the shaft cover sealing cover body 11 so that the shaft end static sealing ring 21 moves downward following the pressed-down shaft cover sealing cover body 11 until the shaft end static sealing contact end face at the lower end of the shaft end static sealing ring 21 fits with the shaft end dynamic sealing contact end face at the upper end of the shaft end dynamic sealing ring 22. Continue to press down the shaft cover sealing cover body 11 to make the shaft end dynamic sealing ring 22 squeeze the shaft end elastic support mechanism 24 downward. Use the shaft end dynamic ring elastic support component 241 and the shaft end dynamic ring support ring 242 of the shaft end elastic support mechanism 24 to push up the shaft end dynamic sealing ring 22, so that the shaft end static sealing contact end face at the lower end of the shaft end static sealing ring 21 fits tightly and firmly with the shaft end dynamic sealing contact end face at the upper end of the shaft end dynamic sealing ring 22. Adjust the positions of the sealing gasket 12 and the shaft cover sealing cover body 11 to make the sealing gasket 12 fit and align with the shaft cover sealing cover body 11. After aligning the combined threaded hole 111, the mounting hole 121, and the combined through hole 42, pass the locking component through the combined through hole 42 and the mounting hole 121 and then combine it with the combined threaded hole 111 to lock and install the shaft cover sealing cover body 11 on the pump cover 4, completing the assembly of the shaft end sealing structure and the shaft cover end sealing structure.

[0055] Slip the cover end static sealing ring 31 and the cover end dynamic sealing ring 32 onto the lower transmission end of the transmission shaft 5 in sequence. Push up the cover end elastic limit locking ring 33 so that the cover end dynamic sealing contact end face at the upper end of the cover end dynamic sealing ring 32 fits with the cover end static sealing contact end face at the lower end of the cover end static sealing ring 31. Continue to push up the cover end elastic limit locking ring 33 and use the compression and support effect of the cover end dynamic ring elastic support component 341 of the cover end elastic support mechanism 34 to continuously push up the cover end dynamic sealing ring 32 through the cover end dynamic ring support ring 342, so that the cover end dynamic ring elastic support component 341 compresses and pushes up the shaft end elastic dynamic sealing ring 22 through the cover end dynamic ring support ring 342. Then lock the second locking mechanism 332 to lock and install the cover end elastic limit locking ring 33 at the support limit position of the lower transmission end of the transmission shaft 5, completing the assembly of the cover end sealing structure.

[0056] Then unscrew the oil hole sealing plug 152 of the oil injection sealing structure 15, and inject sealing oil (engine oil) into the oil storage lubrication sealing cavity through the oil injection hole 151. After completion of the injection, install the oil hole sealing plug 152 back into the oil injection hole 151, and seal the oil storage lubrication sealing cavity with the oil injection sealing structure 15 to store the engine oil in the oil storage lubrication sealing cavity, completing the installation of the shaft cover lubrication sealing structure.

[0057] During operation, the motor drives the transmission shaft 5 to rotate the water pump. The transmission shaft 5 drives the elastic dynamic seal ring 22 at the upper shaft end and the dynamic seal ring 32 at the cover end to rotate. The shaft end dynamic seal contact end face at the upper end of the shaft end elastic dynamic seal ring 22 fits and slides with the shaft end static seal contact end face at the lower end of the shaft end static seal ring 21 to form a shaft end seal. The cover end dynamic seal contact end face at the upper end of the cover end dynamic seal ring 32 fits and slides with the cover end static seal contact end face at the lower end of the cover end static seal ring 31 to form a cover end seal. When the transmission shaft 5 rotates during operation, there is a rotational clearance between the shaft end transmission shaft combination hole of the transmission shaft 5 and the shaft end static seal ring 21 and the cover end transmission shaft combination hole of the cover end static seal ring 31, so that the transmission shaft 5 of the water pump will not come into contact friction interference with the shaft end static seal ring 21 and the cover end static seal ring 31 during operation and rotation, keeping the equipment running normally and the system working smoothly. The engine oil filled in the oil storage lubrication and seal cavity of the shaft cover seal body 11 continuously provides lubrication protection for the shaft end seal structure and the cover end seal structure, so that when the water pump with the multi-seal anti-leakage mechanism of the water pump shaft cover provided by the present invention runs continuously under liquid-deficient and no-load conditions, the contact end faces between the shaft end static seal ring 21 and the shaft end elastic dynamic seal ring 22 and between the cover end static seal ring 31 and the cover end dynamic seal ring 32 will not undergo dry grinding and temperature rise during continuous rotation, resulting in seal failure.

[0058] After installing the multi-seal anti-leakage mechanism of the water pump shaft cover provided by the present invention, during the operation and production of the equipment, even if one of the seal mechanisms of the cover end seal or the shaft end seal fails, it can still ensure the normal operation of the water pump, ensure the normal water supply to the water-using equipment, and the production system can operate normally.

[0059] When the multi-seal anti-leakage mechanism of the water pump shaft cover provided by the present invention needs to replenish engine oil after running for a sufficient time, the oil hole seal plug 152 of the oil injection seal structure 15 can be opened, and engine oil can be replenished into the oil storage lubrication and seal cavity through the oil injection hole 151. After the engine oil replenishment is completed, the oil hole seal plug 152 is reinstalled into the oil injection hole 151, and the oil injection seal structure 15 seals the oil storage lubrication and seal cavity to restore internal lubrication and seal, and it can continue to operate safely.

[0060] Second Embodiment:

[0061] This embodiment is similar to the second embodiment. The difference is that a positioning boss 41 is provided on the combined end face of the shaft hole of the pump cover 4 in this embodiment, and a combined positioning opening 17 is opened at the installation end of the shaft cover seal body 11. The positioning boss 41 and the combined positioning opening 17 are in an embedded positioning fit with each other, so that the shaft cover seal body 11 can be installed on the pump cover 4 more accurately, tightly and stably.

[0062] During installation, first embed the shaft-end static seal ring 21 and snap it into the shaft-end static seal ring installation groove 16, and embed the cover-end static seal ring 31 and snap it into the cover-end static seal ring installation groove 44.

[0063] Install the shaft cover seal body 11, the shaft-end elastic dynamic seal ring 22, and the support limit lock ring 23 onto the upper journal of the transmission shaft 5 in sequence. Fix the support limit lock ring 23 at the support limit position of the transmission shaft 5 by tightening the first locking mechanism 232. Place the sealing gasket 12 on the pump cover 4 and snap it outside the positioning boss 41. Press down the shaft cover seal body 11 so that the shaft-end static seal ring 21 moves downward following the pressed-down shaft cover seal body 11 until the shaft-end static seal contact end face at the lower end of the shaft-end static seal ring 21 fits with the shaft-end dynamic seal contact end face at the upper end of the shaft-end dynamic seal ring 22. Continue to press down the shaft cover seal body 11 to make the shaft-end dynamic seal ring 22 squeeze the shaft-end elastic support mechanism 24 downward. Use the shaft-end dynamic ring elastic support part 241 and the shaft-end dynamic ring support ring 242 of the shaft-end elastic support mechanism 24 to push up the shaft-end dynamic seal ring 22, so that the shaft-end static seal contact end face at the lower end of the shaft-end static seal ring 21 fits tightly and firmly with the shaft-end dynamic seal contact end face at the upper end of the shaft-end dynamic seal ring 22. After the combination positioning opening 17 and the positioning boss 41 are embedded and combined, align the combined threaded hole 111, the installation hole 121, and the combined through hole 42, and then use the locking part to pass through the combined through hole 42 and the installation hole 121 and combine with the combined threaded hole 111 to lock and install the shaft cover seal body 11 on the pump cover 4, completing the assembly of the shaft-end seal structure and the shaft cover-end seal structure.

[0064] Put the cover-end static seal ring 31 and the cover-end dynamic seal ring 32 onto the lower transmission end of the transmission shaft 5 in sequence. Push up the cover-end elastic limit locking ring 33 so that the cover-end dynamic seal contact end face at the upper end of the cover-end dynamic seal ring 32 fits with the cover-end static seal contact end face at the lower end of the cover-end static seal ring 31. Continue to push up the cover-end elastic limit locking ring 33 and use the compression and support effect of the cover-end dynamic ring elastic support part 341 of the cover-end elastic support mechanism 34 to continuously push up the cover-end dynamic seal ring 32 through the cover-end dynamic ring support ring 342, so that the cover-end dynamic ring elastic support part 341 compresses and pushes up the shaft-end elastic dynamic seal ring 22 through the cover-end dynamic ring support ring 342. Then lock the second locking mechanism 332 to lock and install the cover-end elastic limit locking ring 33 at the support limit position of the lower transmission end of the transmission shaft 5, completing the assembly of the cover-end seal structure.

[0065] Third Embodiment:

[0066] This embodiment is similar to the second embodiment. The difference is that on the upper end surface of the pump cover 4, an auxiliary sealing groove 43 is formed outside the positioning boss 41. The sealing gasket 12 is embedded and installed in the auxiliary sealing groove 43, and the shape of the auxiliary sealing groove 43 is the same as that of the sealing gasket 12.

[0067] When assembling and installing the shaft cover sealing cover body 11 and the pump cover 4, first place the sealing gasket 12 outside the positioning boss 41 and then embed and snap it into the auxiliary sealing groove 43, so that the sealing gasket 12 is accurately and firmly placed, improving the assembly accuracy of the sealing gasket 12. During the assembly, the sealing gasket 12 will not shift, enabling the sealing gasket 12 to fit better and more closely with the shaft cover sealing cover body 11 and the pump cover 4, achieving a better auxiliary sealing and leak prevention effect.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A water pump shaft cover multi-seal anti-leakage mechanism, characterized in that: The invention comprises a shaft cover connecting sealing structure (1), a shaft end sealing and leakproof structure (2) and a cover end sealing and leakproof structure (3) installed on a pump cover (4); the pump cover (4) has an axial hole in the middle, a transmission shaft (5) is installed in the axial hole, the shaft cover connecting sealing structure (1) is installed at one end of the pump cover (4), the shaft end sealing and leakproof structure (2) is installed in the shaft cover connecting sealing structure (1), and the cover end sealing and leakproof structure (3) is installed at the other end of the pump cover (4); the shaft end sealing and leakproof structure (2) and the transmission shaft (5) are combined to form a shaft end sealing structure; the cover end sealing and leakproof structure (3) and the transmission shaft (5) are combined to form a cover end sealing structure; the shaft cover connecting sealing structure (1), the shaft end sealing and leakproof structure (2), the cover end sealing and leakproof structure (3) and the pump cover (4) and the transmission shaft (5) are combined to form a shaft cover lubricating sealing structure.

2. A water pump shaft cover multi-seal anti-leakage mechanism according to claim 1, characterized in that: The shaft cover sealing cover body (11) of the shaft cover connecting sealing structure (1) is installed on the transmission shaft (5) through the transmission shaft mounting hole (13); an oil storage lubrication sealing chamber (14) is provided inside the shaft cover sealing cover body (11); the shaft end static sealing ring (21) of the shaft end sealing and leakproof structure (2) is installed on the inner side of the transmission shaft mounting hole (13); the outer wall of the shaft cover sealing cover body (11) is provided with a sealing oil injection structure (15); the shaft end static sealing ring (21) of the shaft end sealing and leakproof structure (2) and the shaft end dynamic sealing ring are installed on the transmission shaft (5) in a mutually fitting manner; the shaft end dynamic sealing ring is locked and fixedly installed on the transmission shaft (5); the shaft cover sealing cover body (11) is installed on the end surface of the pump cover (4); the shaft cover sealing cover A sealing gasket (12) is provided between the body (11) and the end surface of the pump cover (4); the cover end static sealing ring (31) of the cover end sealing and leakproof structure (3) is installed on the side of the shaft hole of the pump cover (4) facing the impeller assembly; the cover end static sealing ring (31) of the cover end sealing and leakproof structure (3) and the cover end dynamic sealing ring are installed on the journal of the drive shaft (5) at the protruding end of the pump cover (4) in a mutually fitting manner; the cover end dynamic sealing ring is locked and fixedly installed on the drive shaft (5); the inner walls of the shaft end dynamic sealing ring and the cover end dynamic sealing ring are provided with elastic sealing structures; the elastic sealing structure and the outer wall of the drive shaft (5) are mutually sealingly fitted; the shaft end dynamic sealing ring, the cover end dynamic sealing ring and the drive shaft (5) rotate synchronously.

3. A water pump shaft cover multi-seal anti-leakage mechanism according to claim 2, characterized in that: The inner side of the transmission shaft mounting hole (13) is provided with a shaft end static sealing ring mounting groove (16), the outer wall of the shaft end static sealing ring (21) is provided with a shaft end sealing rubber ring (211), the shaft end static sealing ring (21) is fixedly mounted in the shaft end static sealing ring mounting groove (16) through the shaft end sealing rubber ring (211), the shaft end sealing rubber ring (211) and the shaft end static sealing ring mounting groove (16) are interference fit combination, the shaft end dynamic sealing ring (22) and the shaft end elastic support limit locking ring (23) of the shaft end dynamic sealing ring component are mounted on the shaft neck of the transmission shaft (5), the inner side of the shaft end dynamic sealing ring (22) is provided with a shaft end sealing ring (221), the inner side sealing of the shaft end sealing ring (221) is provided with a shaft end sealing ring (221). The shaft end dynamic seal ring (221) is fitted on the outer wall of the transmission shaft (5), the shaft end dynamic seal contact end face of the shaft end dynamic seal ring (22) and the shaft end static seal contact end face of the shaft end static seal ring (21) are slidably fitted to each other, the shaft end elastic support limit locking ring (23) is internally installed with a shaft end elastic support mechanism (24), the shaft end elastic support mechanism (24) is fitted on the support end of the shaft end dynamic seal ring (22), the shaft end elastic support limit locking ring (23) and the shaft end dynamic seal ring (22) are synchronously rotated and combined through the shaft end limit structure (25), and the shaft end elastic support limit locking ring (23) is provided with a shaft end elastic support mechanism (24). A first locking mechanism (232) is provided on the outer side of the impeller assembly, wherein the first locking mechanism (232) locks and mounts the shaft end elastic support limiting locking ring (23) on the transmission shaft (5), and the shaft end elastic support limiting locking ring (23) compresses the shaft end elastic support mechanism (24) so ​​that the shaft end dynamic sealing ring (22) and the shaft end static sealing ring (21) are tightly fitted and combined, and the combination of the shaft end sealing ring (221) and the transmission shaft (5) forms a shaft end seal, and a cover end static sealing ring installation groove (44) is formed on the side of the shaft hole facing the impeller assembly, and a cover end sealing rubber ring (311) is provided on the outer wall of the cover end static sealing ring (31), and the cover end static sealing ring (31) is sealed by the cover end sealing rubber ring (311). ) is installed in the cover end static sealing ring installation groove (44), the cover end sealing rubber ring (311) and the cover end static sealing ring installation groove (44) are interference fit combination, the cover end dynamic sealing ring (32) and the cover end elastic limit locking ring (33) of the cover end dynamic sealing ring are installed on the shaft neck of the extended end of the pump cover (4) of the transmission shaft (5), the inner side of the cover end dynamic sealing ring (321) is installed, the inner side sealing surface of the cover end sealing ring (321) is in contact with the outer wall of the transmission shaft (5), the cover end sealing ring (321) and the outer wall of the transmission shaft (5) are interference fit, and the combination of the cover end sealing ring (321) and the transmission shaft (5) forms a cover end seal,The cover end dynamic seal contact end surface of the dynamic seal end of the cover end dynamic seal ring (32) and the cover end static seal contact end surface of the static seal end of the cover end static seal ring (31) are slidably fitted to each other, the cover end elastic limit locking ring (33) is fitted to the cover end dynamic seal ring (32), a cover end elastic support mechanism (34) is installed in the cover end elastic limit locking ring (33), a support end of the cover end elastic support mechanism (34) is arranged against the contact end of the cover end elastic limit locking ring (33), and the cover end elastic limit locking ring (33) is provided with a cover end elastic support mechanism (34). The support mechanism (34) pushes up the cover end dynamic sealing ring (32) so that the cover end dynamic sealing ring (32) and the cover end static sealing ring (31) are tightly fitted and combined. A second locking mechanism (332) is provided on the outer side of the cover end elastic limit locking ring (33). The second locking mechanism (332) locks the cover end elastic limit locking ring (33) and installs it on the transmission shaft (5). The cover end dynamic sealing ring (32) and the cover end elastic limit locking ring (33) are synchronously rotated and combined through the cover end limit structure (35).

4. A water pump shaft cover multi-seal anti-leakage mechanism according to any one of claims 2 or 3, characterized in that: A positioning boss (41) is provided on the combined end surface of the shaft hole of the pump cover (4), a combined positioning opening (17) is provided on the mounting end of the shaft cover sealing cover body (11), and the positioning boss (41) and the combined positioning opening (17) are mutually embedded and positioned.

5. A water pump shaft cover multi-seal anti-leakage mechanism according to claim 4, characterized in that: An auxiliary sealing groove (43) is formed on the combined end surface of the pump cover (4) on the outer side of the positioning boss (41), and the sealing gasket (12) is embedded and installed in the auxiliary sealing groove (43).

6. A water pump shaft cover multi-seal anti-leakage mechanism according to any one of claims 2 or 3, characterized in that: The mounting end of the outer wall of the shaft cover sealing cover body (11) is provided with a combination threaded hole (111) in an equidistant array, the outer side of the shaft hole is provided with a combination through hole (42) aligned with the combination threaded hole (111), the sealing gasket (12) is provided with a mounting hole (121) aligned with the combination threaded hole (111), and the locking component passes through the combination through hole (42) and the mounting hole (121) and is then combined with the combination threaded hole (111) to lock the shaft cover sealing cover body (11) onto the pump cover (4).

7. A water pump shaft cover multi-seal anti-leakage mechanism according to claim 3, characterized in that: The shaft end elastic support mechanism (24) comprises a shaft end dynamic ring elastic support component (241) and a shaft end dynamic ring support ring (242); the shaft end dynamic ring elastic support component (241) is placed in the shaft end elastic support limit locking ring (23); the shaft end dynamic ring support ring (242) is placed at the elastic support end of the shaft end dynamic ring elastic support component (241); the shaft end dynamic ring support ring (242) is supported and fitted with the shaft end dynamic sealing ring (22); and the shaft end dynamic ring support ring (242) is clamped at the limit end of the shaft end limit structure (25). The cover end elastic support mechanism (34) comprises a cover end dynamic ring elastic support component (341) and a cover end dynamic ring support ring (342); the cover end dynamic ring elastic support component (341) is placed in the cover end elastic limit locking ring (33); the cover end dynamic ring support ring (342) is placed at the elastic support end of the cover end dynamic ring elastic support component (341); the cover end dynamic ring support ring (342) is supported and fitted with the cover end dynamic sealing ring (32); and the cover end dynamic ring support ring (342) is clamped at the limit end of the cover end limit structure (35).

8. A water pump shaft cover multi-seal anti-leakage mechanism according to any one of claims 3 or 7, characterized in that: The shaft end limiting structure (25) comprises a shaft end combined positioning groove (222) formed on the outer side of the shaft end dynamic sealing ring (22), and a shaft end combined limiting protrusion (231) cooperating with the shaft end combined positioning groove (222) formed on the inner side of the shaft end elastic support limiting locking ring (23). The shaft end combined limiting protrusion (231) and the shaft end combined positioning groove (222) are combined to enable the shaft end elastic support limiting locking ring (23) to drive the shaft end dynamic sealing ring (22) to maintain synchronization with the transmission shaft (5). The cover end limiting structure (35) comprises a cover end combined positioning groove (322) formed on the outer side of the cover end dynamic sealing ring (32), and a cover end combined limiting protrusion (331) matched with the cover end combined positioning groove (322) formed on the inner side of the cover end elastic limiting locking ring (33). The combined limiting protrusion (331) and the combined positioning groove (322) are combined so that the cover end elastic limiting locking ring (33) drives the cover end dynamic sealing ring (32) and the transmission shaft (5) to rotate synchronously.

9. The water pump shaft cover multi-seal anti-leakage mechanism according to claim 2, characterized in that: The sealing oil injection structure (15) comprises an oil injection hole (151) and an oil hole sealing screw plug (152); the oil injection hole (151) is opened on the outer wall of the shaft cover sealing cover body (11); and the oil hole sealing screw plug (152) is installed in the oil injection hole (151).

10. The water pump shaft cover multi-seal anti-leakage mechanism according to claim 3, characterized in that: The shaft end static seal contact end surface and the cover end static seal contact end surface are silicon carbide static seal contact end surfaces, the shaft end dynamic seal contact end surface and the cover end dynamic seal contact end surface are stainless steel alloy dynamic seal contact end surfaces, and a rotational clearance is left between the transmission shaft (5) and the transmission shaft mounting hole (13), the shaft end transmission shaft combination hole of the shaft end static seal ring (21), and the cover end transmission shaft combination hole of the cover end static seal ring (31).

Images