Gear pump shaft tail mechanical sealing device
By integrating sealing components and using a split wear-resistant ring design, the problems of complex structure and low reliability of traditional gear pump shaft tail mechanical seals are solved, achieving simplified assembly, reduced costs, and improved sealing performance.
Patent Information
- Application Number
- CN202511944425.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-02-13
AI Technical Summary
Traditional gear pump shaft tail mechanical seals have complex structures, are difficult to assemble, have high production costs, and low reliability, making them prone to fluid leakage.
An integrated sealing assembly is adopted, including a guide ring, a wear-resistant ring, a compensating spring, and a sealing ring. The wear-resistant ring is designed as a separate unit, and axial sealing is achieved through guide holes and guide grooves. An outer sealing ring is provided between the integrated sealing assembly and the housing, simplifying the assembly process.
It improves the reliability of mechanical seals, reduces production and maintenance costs, simplifies the assembly and disassembly process, and avoids seal failure caused by misalignment of parts.
Smart Images
Figure CN121520188A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of dynamic seal design technology. Background Technology
[0002] A gear pump shaft tail mechanical seal is a shaft sealing device used on the rotating shaft of a gear pump. It prevents fluid leakage through the relative movement of two precisely matched sealing surfaces. It has advantages such as good sealing effect, long service life, and adaptability to harsh working conditions. If the gear pump shaft tail mechanical seal fails, it will lead to fluid leakage, which may result in fluid loss or even serious safety accidents.
[0003] Currently, traditional gear pump shaft tails have complex mechanical structures, are difficult to assemble, and have high production costs. Summary of the Invention
[0004] The purpose of this invention is to provide a mechanical seal device for the tail shaft of a gear pump, which can effectively reduce the number of parts in the mechanical seal structure, improve the assemblability of the mechanical seal, avoid seal failure caused by misalignment of parts, improve the reliability of the mechanical seal, and reduce production and maintenance costs.
[0005] To solve the above-mentioned technical problems, the present invention provides a mechanical seal device for the tail shaft of a gear pump, comprising a drive shaft and a housing mounted on the drive shaft. A sealing assembly is provided between the drive shaft and the housing. The sealing assembly includes an integrated sealing assembly and a guide ring. The guide ring is assembled on the drive shaft and rotates synchronously with the drive shaft. The integrated sealing assembly is fixed to the housing. The end face of the guide ring is provided with a sealing groove, and a shaft sealing ring is installed in the sealing groove to achieve axial sealing between the guide ring and the drive shaft. The end face of the guide ring is also provided with a guide hole penetrating its body. One end of the guide hole communicates with the sealing groove, and the other end opens to the outside. The integrated sealing assembly includes a sealing shell connected to the housing. The sealing shell is a cylindrical structure with one open end, and its open end has a constricted portion formed by inward rolling. The inner wall of the sealing shell has a guide groove extending axially. A wear-resistant ring is provided inside the sealing shell. The outer circumference of the wear-resistant ring cooperates with the guide groove to restrict its circumferential rotation. The end face of the wear-resistant ring is in contact with the end face of the guide ring and slides relative to it. A compensating spring is provided between the wear-resistant ring and the sealing shell. The compensating spring acts on the wear-resistant ring to keep the end face of the wear-resistant ring pressed against the end face of the guide ring. An inner sealing ring is provided between the compensating spring and the constricted portion for sealing between the sealing shell and the wear-resistant ring. An outer sealing ring is provided between the sealing shell and the housing for sealing between the integrated sealing assembly and the housing.
[0006] The wear-resistant ring has a split structure, including a wear-resistant ring base and a wear-resistant ring ring. The wear-resistant ring base is made of high-strength metal material, and its outer periphery is provided with a sliding part that works in conjunction with the guide groove, and its interior is provided with an installation groove. The wear-resistant ring is made of wear-resistant material and has a regular rotating body structure, which is fixedly installed in the installation groove.
[0007] The end face of the wear-resistant ring is in contact with the end face of the guide ring and slides relative to each other.
[0008] The wear-resistant ring is fixedly connected to the wear-resistant ring base by an adhesive.
[0009] The housing has a locking groove at the installation position of the integrated sealing component, and an elastic locking ring is provided in the locking groove to axially limit the integrated sealing component on the housing.
[0010] The flow guide holes are multiple through holes distributed circumferentially along the flow guide ring.
[0011] The compensation spring is a wave spring or a helical spring.
[0012] Both the inner and outer sealing rings are O-rings.
[0013] The guide groove is at least two protrusions or grooves extending axially along the inner wall of the sealing shell.
[0014] Compared with the prior art, the present invention solves the problems of low reliability and high maintenance cost of traditional mechanical seals; it can significantly improve the assemblability of mechanical seal devices, reduce production and maintenance costs, and improve the reliability of mechanical seals.
[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description
[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the middle sealing shell; Figure 3 yes Figure 2 A bottom view; Figure 4 yes Figure 1 Schematic diagram of the wear-resistant ring structure; Figure 5 yes Figure 4 Schematic diagram of the structure of the wear-resistant ring; Figure 6 yes Figure 4 Schematic diagram of the wear-resistant ring steel matrix structure; Figure 7 This is a schematic diagram of the structure of an integrated wear-resistant ring in the prior art.
[0018] In the diagram: 1-drive shaft, 2-sealing shell, 3-elastic locking ring, 4-compensating spring, 5-inner sealing ring, 6-outer sealing ring, 7-guide groove, 8-wear-resistant ring, 9-retracting part, 10-guide flow ring, 11-shaft sealing ring, 12-guide hole, 13-shell, 14-sliding groove, 15-sealing groove, 16-wear-resistant ring steel base, 17-wear-resistant ring. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the embodiments of this invention to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this invention. The embodiments can be combined with and referenced by each other without contradiction.
[0020] Example 1 like Figures 1-6The mechanical seal device for the tail shaft of a gear pump shown includes a drive shaft 1 and a housing 13 mounted on the drive shaft 1. A sealing assembly is provided between the drive shaft 1 and the housing 13. The sealing assembly includes an integrated sealing assembly and a guide ring 10. The guide ring 10 is assembled on the drive shaft 1 and rotates synchronously with the drive shaft 1. The integrated sealing assembly is fixed on the housing 13. The end face of the guide ring 10 is provided with a sealing groove, and a shaft sealing ring 11 is installed in the sealing groove to achieve axial sealing between the guide ring 10 and the drive shaft 1. The end face of the guide ring 10 is also provided with a guide hole 12 penetrating its body. One end of the guide hole 12 communicates with the sealing groove, and the other end opens to the outside. The integrated sealing assembly includes a sealing shell 2 connected to the housing 13. The sealing shell 2 is... A cylindrical structure with one open end has an inwardly rolled-in end 9. The inner wall of the sealing shell 2 has an axially extending guide groove 7. A wear-resistant ring 8 is provided inside the sealing shell 2. The outer circumference of the wear-resistant ring 8 cooperates with the guide groove 7 to restrict its circumferential rotation. The end face of the wear-resistant ring 8 is in contact with the end face of the guide ring 10 and slides relative to each other. A compensation spring 4 is provided between the wear-resistant ring 8 and the sealing shell 2. The compensation spring 4 acts on the wear-resistant ring 8 to keep the end face of the wear-resistant ring 8 pressed against the end face of the guide ring 10. An inner sealing ring 5 is provided between the compensation spring 4 and the rolled-in end 9 for sealing between the sealing shell 2 and the wear-resistant ring 8. An outer sealing ring 6 is provided between the sealing shell 2 and the housing 13 for sealing between the integrated sealing assembly and the housing 13.
[0021] The wear-resistant ring 8 is a split structure, including a wear-resistant ring base 16 and a wear-resistant ring 17. The wear-resistant ring base 16 is made of high-strength metal material, and its outer periphery is provided with a sliding part that works in conjunction with the guide groove 7, and its interior is provided with an installation groove. The wear-resistant ring 17 is made of wear-resistant material and has a regular rotating body structure, which is fixedly installed in the installation groove.
[0022] The end face of the wear-resistant ring 17 is in contact with the end face of the guide ring 10 and slides relative to each other.
[0023] The wear-resistant ring 17 is fixedly connected to the wear-resistant ring base 16 by an adhesive.
[0024] The housing 13 is provided with a locking groove at the installation position of the integrated sealing component, and an elastic locking ring 3 is provided in the locking groove to axially limit the integrated sealing component on the housing 13.
[0025] The flow guide holes 12 are multiple through holes distributed circumferentially along the flow guide ring 10.
[0026] The compensation spring 4 is a wave spring or a helical spring.
[0027] Both the inner sealing ring 5 and the outer sealing ring 6 are O-rings.
[0028] The guide groove 7 consists of at least two protrusions or grooves extending axially along the inner wall of the sealing shell 2.
[0029] Example 2 The guide ring 10 is mounted on the drive shaft 1. The guide ring 10 is provided with a sealing groove and a guide hole 12. The shaft seal ring 11 is installed in the sealing groove between the guide ring 12 and the drive shaft 1. The guide hole 12 communicates with the outside of the guide ring 10. When the product is working, the oil entering the sealing groove of the guide ring 10 will be thrown to the outside of the guide ring 10 through the guide hole 12 under the action of centrifugal force. This ensures the seal while improving the fluidity of the oil inside the product, thereby avoiding local high temperature phenomenon and improving the sealing performance of the entire mechanism.
[0030] The integrated sealing assembly consists of a sealing shell 2, a compensating spring 4, a wear-resistant ring 8, and an inner sealing ring 5. A guide groove 7 is provided in the sealing shell 2 to restrict the circumferential movement of the wear-resistant ring 8. A tapering part 9 is provided at the tail end of the sealing shell 2 to prevent the wear-resistant ring 8, the compensating spring 4, and the inner sealing ring 5 from falling off. The wear-resistant ring 8 and the guide ring 10 of the integrated sealing assembly are tightly fitted under the action of the compensating spring 4, preventing oil leakage from the mating surface. An outer sealing ring 6 is provided between the integrated sealing assembly and the housing 13 to prevent oil leakage from the gap between the housing 13 and the integrated sealing assembly. A locking groove is provided on the housing 13. After the integrated seal is assembled, an elastic locking ring 3 is installed. For disassembly, the elastic locking ring 3 is removed to remove the drive shaft 1, the guide ring 10, and the integrated sealing assembly. This simplifies the product structure, facilitates installation and disassembly, improves the reliability of the gear pump shaft tail mechanical seal, reduces product maintenance costs, and shortens maintenance cycles.
[0031] Example 3 In the prior art, the wear-resistant ring 8 is made of powder metallurgy wear-resistant material. Because this material is relatively "brittle", the structure of the wear-resistant ring 8 is as shown in 7. It has a sliding groove 14 and a sealing groove 15 inside. The geometry is complex and the structural strength is insufficient. It is very difficult to process and is easily damaged during transportation and assembly.
[0032] To address this problem, this embodiment provides a novel structure, such as... Figures 4-6 As shown, the wear-resistant ring 8 is divided into a wear-resistant ring rigid base 16 and a wear-resistant ring 17. The wear-resistant ring 17 is a regular rotating body, as shown in the figure. Figure 5 As shown, the material is consistent with that of the wear-resistant ring 8; the complex parts are processed separately, and the structure of the wear-resistant ring rigid matrix 16 is as follows. Figure 6 As shown, this part is machined from high-strength steel, which reduces the difficulty of machining while increasing the product strength. Finally, the two parts are glued together. This structure satisfies dynamic sealing while also increasing product strength. In the design, the thickness of the wear ring 17 can be relatively thinner, and the contact area between the thin wear ring 17 and the guide ring 10 is smaller, thereby reducing the heat generation at the shaft tail.
[0033] In summary, the present invention integrates the wear-resistant ring 8, the compensating spring 4, the inner sealing ring 5, and the sealing shell 2 into a single component. A guide groove 7 is provided in the sealing shell 2 to restrict the circumferential movement of the wear-resistant ring 8. A mechanical closing part 9 is designed at the top of the sealing shell 2 to prevent the wear-resistant ring 8, the compensating spring 4, and the inner sealing ring 5 from falling off. A shaft seal ring 11 is provided between the guide ring 10 and the drive shaft 1, and the guide hole 12 of the guide ring 10 communicates with the outside. When the product is working, the oil entering the guide ring 10 will be thrown to the outside of the guide ring 10 through the guide hole 12 under the action of centrifugal force, which ensures the seal while improving the fluidity of the oil inside the product, thereby avoiding local high temperature phenomenon and improving the sealing performance of the entire mechanism. The sealing shell 2, the compensating spring 4, the wear ring 8 and the inner seal ring 5 are integrated into one component to form an integrated sealing component. Its structure is simple and easy to install and disassemble, which can improve the reliability of mechanical seal, reduce product maintenance costs and shorten maintenance cycle. The complex wear ring 8 adopts a split design, which improves the product manufacturability, reduces processing difficulty and saves processing costs.
[0034] Those skilled in the art will understand that the above embodiments can be modified in form and detail in practical applications without departing from the spirit and scope of the invention.
Claims
1. A mechanical seal device for the tail of a gear pump shaft, characterized in that: The device includes a drive shaft (1) and a housing (13) mounted on the drive shaft (1). A sealing assembly is provided between the drive shaft (1) and the housing (13). The sealing assembly includes an integrated sealing assembly and a guide ring (10). The guide ring (10) is mounted on the drive shaft (1) and rotates synchronously with the drive shaft (1). The integrated sealing assembly is fixed on the housing (13). The end face of the guide ring (10) is provided with a sealing groove. A shaft sealing ring (11) is installed in the sealing groove to achieve axial sealing between the guide ring (10) and the drive shaft (1). The end face of the guide ring (10) is also provided with a guide hole (12) penetrating its body. One end of the guide hole (12) is connected to the sealing groove, and the other end is open to the outside. The integrated sealing assembly includes a sealing shell (2) connected to the housing (13). The sealing shell (2) is a cylindrical structure with one open end. The sealing shell (2) is provided with an inwardly rolled-out end portion (9); the inner wall of the sealing shell (2) is provided with an axially extending guide groove (7); a wear-resistant ring (8) is provided inside the sealing shell (2), the outer periphery of the wear-resistant ring (8) cooperates with the guide groove (7) to restrict its circumferential rotation, and the end face of the wear-resistant ring (8) is attached to and slides relative to the end face of the guide ring (10); a compensation spring (4) is provided between the wear-resistant ring (8) and the sealing shell (2), and the compensation spring (4) acts on the wear-resistant ring (8) so that the end face of the wear-resistant ring (8) is always pressed against the end face of the guide ring (10); an inner sealing ring (5) is provided between the compensation spring (4) and the end portion (9) for sealing between the sealing shell (2) and the wear-resistant ring (8); an outer sealing ring (6) is provided between the sealing shell (2) and the shell (13) for sealing between the integrated sealing assembly and the shell (13).
2. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: The wear-resistant ring (8) is a split structure, including a wear-resistant ring base (16) and a wear-resistant ring (17). The wear-resistant ring base (16) is made of high-strength metal material, and its outer periphery is provided with a sliding part that works in conjunction with the guide groove (7), and its interior is provided with an installation groove. The wear-resistant ring (17) is made of wear-resistant material and is a regular rotating body structure, which is fixedly installed in the installation groove.
3. The gear pump shaft tail mechanical seal device as described in claim 2, characterized in that: The end face of the wear-resistant ring (17) is attached to the end face of the guide ring (10) and slides relative to each other.
4. The gear pump shaft tail mechanical seal device as described in claim 2, characterized in that: The wear-resistant ring (17) is fixedly connected to the wear-resistant ring base (16) by an adhesive.
5. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: The housing (13) is provided with a locking groove at the installation position of the integrated sealing component, and an elastic locking ring (3) is provided in the locking groove to axially limit the integrated sealing component on the housing (13).
6. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: The guide hole (12) is a plurality of through holes distributed circumferentially along the guide flow ring (10).
7. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: The compensation spring (4) is a wave spring or a helical spring.
8. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: Both the inner sealing ring (5) and the outer sealing ring (6) are O-rings.
9. The gear pump shaft tail mechanical seal device as described in claim 1, characterized in that: The guide groove (7) is at least two protrusions or grooves extending axially along the inner wall of the sealing shell (2).