Positioning transmission device capable of keeping sealing precision

Abstract

The utility model discloses a positioning transmission device capable of keeping sealing precision, which comprises a non-driving inner shaft sleeve, a shaft sleeve is sleeved on the periphery of the non-driving inner shaft sleeve, the shaft sleeve is connected with the non-driving inner shaft sleeve through a transmission key, a sealing gland is sleeved on the periphery of the shaft sleeve, a cooling inner ring is arranged in the sealing gland, and the cooling inner ring is connected with the non-driving inner shaft sleeve. The periphery of the shaft sleeve is in interference connection with the floating ring assembly, the rotating ring assembly is installed at the end of the floating ring assembly, the rotating working part and the non-rotating working part are combined, tight attachment of the sealing rotating ring assembly and the floating ring assembly is achieved, liquid films exist on the two friction end faces to achieve lubrication, and then the long-term stable leakage stopping function of mechanical sealing is achieved. And the durability of the mechanical sealing assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical components technology, and in particular to a positioning transmission device that maintains sealing accuracy. Background Technology

[0002] Mechanical seals, also known as end face seals, are key devices used to seal between rotating shafts and machine bodies. Their core principle is to use at least one pair of end faces perpendicular to the axis of rotation. Under the action of fluid pressure, elastic force of elastic elements, or magnetic force, combined with the cooperation of auxiliary sealing components, the end faces are kept in contact and slide relative to each other, thereby preventing fluid leakage. It is a widely used mechanical component.

[0003] Existing mechanical seals suffer from the following drawbacks during use: When the operating speed exceeds 4000 rpm, the rotational accuracy requirements of the rotating components increase significantly. If the perpendicularity between the sealing friction face and the shaft exceeds 0.03, continuous leakage will occur. When the mechanical seal is subjected to a pressure load exceeding 3.0 MPa, deformation of the sealing ring positioning face will cause deformation of the sealing ring friction face, leading to increased friction during seal operation and ultimately leakage. All of these factors significantly reduce the seal's lifespan. Wear-affected mechanical seal components, judging from the friction marks, primarily exhibit deformation of the sealing friction face; uneven stress on the friction surface; and localized abnormally high pressure, causing destructive wear on the friction surface. Debris falling off forms plow-groove-like scratches, exacerbating leakage and preventing the seal from meeting required service life. Therefore, we propose a positioning transmission device to maintain sealing accuracy. Utility Model Content

[0004] The main purpose of this utility model is to provide a positioning transmission device that maintains sealing accuracy. By improving the stationary and rotating components of the mechanical seal, the rotating working part is combined with the rotating working part to achieve tight contact between the sealing rotating ring and the floating ring. The two ends of the friction have a liquid film to achieve lubrication, thereby realizing the long-term stable leakage prevention function of the mechanical seal, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A positioning transmission device for maintaining sealing accuracy includes a non-drive inner bushing, a bushing sleeve fitted around the outer circumference of the non-drive inner bushing and connected to the bushing sleeve via a transmission key, a sealing cover fitted around the outer circumference of the bushing sleeve, a cooling inner ring disposed inside the sealing cover, a floating ring assembly interference-fitted around the outer circumference of the bushing sleeve and a rotating ring assembly mounted at the end of the floating ring assembly, a rotating ring outer sleeve fitted around the outer circumference of the rotating ring assembly, and a pin installed between the inner wall of the sealing cover and the floating ring assembly, with a spring fitted around the outer circumference of the pin.

[0007] Furthermore, a positioning plate is detachably connected to the side of the sealing cover end, and a screw A is screwed between the positioning plate and the sealing cover. An O-ring A is sleeved on the inner wall of the sealing cover near the floating ring assembly. The positioning plate is fixed to the side of the sealing cover by the screw A, and the positioning plate plays a further role in fixing the end face of the assembly.

[0008] Furthermore, an O-ring B is installed between the rotating ring assembly and the bushing, and a fluororubber ring is embedded in the inner circumference of the bushing and is located at the connection between the bushing and the non-drive inner bushing; the O-ring B improves the sealing performance at the connection, and the use of a fluororubber ring as a sealing component utilizes the material characteristics of fluororubber to obtain better high temperature resistance and corrosion resistance.

[0009] Furthermore, O-rings C and E are respectively fitted at both ends of the connection between the outer periphery of the cooling inner ring and the sealing cap, and an O-ring D is fitted at the side connection of the sealing cap. A screw B is screwed between the sealing cap and the cooling inner ring, and a plug is detachably connected to the outer periphery of the sealing cap near the end of the screw B. O-rings C, D, and E work together to maintain the sealing of the internal connection of the sealing cap, and screw B serves to fix and limit the movement.

[0010] Furthermore, a nut A is detachably connected to the side of the sealing gland end. A clamping disc assembly is provided on the outer periphery of the nut A, and a screw C is screwed into the clamping disc assembly. A stud is provided on the side of the sealing gland, and a nut B is screwed into the stud. An elastic washer fitted on the side of the nut B and sleeved on the outer periphery of the stud. An O-ring F is installed between the non-drive inner bushing and the shaft. The clamping disc and nut A cooperate to further fix the position of each component. The nut B and stud structure cooperate to fix the position of the sealing gland. At the same time, the elastic washer can improve the sealing effect of the nut B installation position.

[0011] Furthermore, cooling water inlet pipes and cooling water outlet pipes are respectively provided on both sides of the top of the sealing cap; external cooling water pipelines are connected through the cooling water inlet pipes and cooling water outlet pipes to realize the circulation of cooling water.

[0012] Compared with the prior art, this utility model has the following beneficial effects: In the stationary component working part, the sealing gland is engaged with the pump body through components such as studs, elastic washers, and nuts, and is sealed with the pump body through O-ring D. The sealing gland and the floating ring assembly are prevented from rotating by an anti-rotation pin, and propulsion compensation is achieved through the cooperation of springs and pins, and sealing is achieved through O-rings; In the rotating component working part, the mechanical seal bushing is driven to rotate through a transmission key and a non-drive inner bushing, and is sealed through a fluororubber ring. The clamping structure composed of nut A and the clamping disc assembly is used to securely lock it with nut B. The bushing is secured by screws and a rotating ring outer sleeve. The rotating ring assembly is driven and positioned. The O-ring B seals the bushing and the rotating ring assembly. The combination of the rotating and non-rotating working parts ensures a tight fit between the rotating ring assembly and the floating ring assembly. A liquid film exists on both ends of the friction surface for lubrication, thereby achieving a long-term stable leak-proof function of the mechanical seal and improving the durability of the mechanical seal assembly. The spring is fitted on the outside of the pin, with one end abutting against the inner wall of the sealing gland and the other end acting on the positioning boss of the floating ring assembly to form the required preload. When the end face of the rotating ring assembly wears, the spring thrust pushes the floating ring assembly axially to compensate, ensuring the fitting accuracy of the friction pair. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installed structure of a positioning transmission device for maintaining sealing accuracy according to this utility model.

[0014] Figure 2 This utility model relates to a positioning transmission device for maintaining sealing accuracy. Figure 1 A schematic diagram of the structure from the A-direction viewpoint.

[0015] In the diagram: 1. Positioning plate; 2. Screw A; 3. Sealing gland; 4. Pin; 5. Spring; 6. O-ring A; 7. Floating ring assembly; 8. Rotating ring assembly; 9. O-ring B; 10. Rotating ring outer sleeve; 11. Transmission key; 12. Non-drive inner bushing; 13. Fluororubber ring; 14. Bushing; 15. O-ring C; 16. O-ring D; 17. Cooling inner ring; 18. Screw B; 19. O-ring E; 20. Nut A; 21. Clamping disc assembly; 22. Screw C; 23. Nut B; 24. Elastic washer; 25. Stud; 26. Plug; 27. O-ring F; 28. Cooling water inlet pipe; 29. ​​Cooling water drain pipe. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figure 1-2As shown, a positioning transmission device for maintaining sealing accuracy includes a non-drive inner bushing 12, a bushing 14 is sleeved around the outer periphery of the non-drive inner bushing 12 and the bushing 14 and the non-drive inner bushing 12 are connected by a transmission key 11, a sealing cover 3 is sleeved around the outer periphery of the bushing 14, a cooling inner ring 17 is provided inside the sealing cover 3, a floating ring assembly 7 is interference-fitted around the outer periphery of the bushing 14 and a rotating ring assembly 8 is installed at the end of the floating ring assembly 7, a rotating ring outer sleeve 10 is sleeved around the outer periphery of the rotating ring assembly 8, a pin 4 is installed between the inner wall of the sealing cover 3 and the floating ring assembly 7 and a spring 5 is sleeved around the outer periphery of the pin 4.

[0018] The sealing cover 3 is detachably connected to a positioning plate 1 on its end side, and a screw A2 is screwed between the positioning plate 1 and the sealing cover 3. An O-ring A6 is fitted onto the inner wall of the sealing cover 3 near the floating ring assembly 7. An O-ring B9 is installed between the rotating ring assembly 8 and the bushing 14. A fluororubber ring 13 is embedded in the inner circumference of the bushing 14, and the fluororubber ring 13 is located at the connection between the bushing 14 and the non-drive inner bushing 12. The positioning plate 1 is fixed to the side of the sealing cover 3 by the screw A2, which further fixes the end face of the assembly. The O-ring B9 improves the sealing performance at the connection. The use of the fluororubber ring 13 as a sealing component utilizes the material characteristics of fluororubber to obtain better high temperature resistance and corrosion resistance.

[0019] O-rings C15 and E19 are respectively fitted at both ends of the connection between the outer periphery of the cooling inner ring 17 and the sealing cover 3. An O-ring D16 is fitted at the side connection of the sealing cover 3. A screw B18 is screwed between the sealing cover 3 and the cooling inner ring 17, and a plug 26 is detachably connected to the outer periphery of the sealing cover 3 near the end of the screw B18. A nut A20 is detachably connected to the side of the end of the sealing cover 3. A clamping disc assembly 21 is provided on the outer periphery of the nut A20, and a screw C22 is screwed into the clamping disc assembly 21. A stud is provided on the side of the sealing cover 3. 25 is connected to a nut B23 by a stud 25. An elastic washer 24 is fitted on the side of the nut B23 and sleeved on the outer periphery of the stud 25. An O-ring F27 is installed between the non-drive inner bushing 12 and the shaft. O-rings C15, D16 and E19 cooperate to maintain the sealing of the internal connection of the sealing cover 3. Screw B18 plays a fixing and limiting role. The clamping disc and nut A20 cooperate to further fix the position of each component. The structure of nut B23 and stud 25 fixes the position of the sealing cover 3. At the same time, the elastic washer 24 can improve the sealing effect of the nut B23 installation position.

[0020] The sealing cap 3 has a cooling water inlet pipe 28 and a cooling water drain pipe 29 on its top two sides respectively; the cooling water inlet pipe 28 and the cooling water drain pipe 29 are connected to the external cooling water pipeline to realize the circulation of cooling water.

[0021] It should be noted that this utility model is a positioning transmission device for maintaining sealing accuracy. In use, in the stationary component's working part, the sealing gland 3 is engaged with the pump body via studs 25, elastic washers 24, nuts, etc., and sealed with the pump body via O-ring D16. The sealing gland 3 and the floating ring assembly 7 are prevented from rotating by an anti-rotation pin, and propulsion compensation is achieved through the cooperation of spring 5 and pin 4, with sealing achieved by the O-ring. In the rotating component's working part, the mechanical seal bushing 14 is driven to rotate via transmission key 11 and non-drive inner bushing 12, and sealed by a fluororubber ring 13. A clamping structure consisting of nut A20 and clamping disc assembly 21 securely locks it to nut B23. 14 The rotating ring assembly 8 is driven and positioned by screws and rotating ring sleeve 10. The O-ring B9 seals the bushing 14 and the rotating ring assembly 8. The combination of rotating and non-rotating working parts achieves tight contact between the sealing rotating ring assembly 8 and the floating ring assembly 7. The presence of a liquid film on both ends of the friction provides lubrication, thereby achieving long-term stable leakage prevention function of the mechanical seal and improving the durability of the mechanical seal assembly. The spring 5 is fitted on the outside of the pin 4, with one end abutting against the inner wall of the sealing cover 3 and the other end acting on the positioning boss of the floating ring assembly 7 to form the required preload. When the end face of the rotating ring assembly 8 wears, the spring thrust pushes the floating ring assembly axially to compensate, ensuring the contact accuracy of the friction pair.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positioning transmission device for maintaining sealing accuracy, comprising a non-drive inner bushing (12), characterized in that, The non-drive inner bushing (12) is fitted with a bushing (14) on its outer periphery, and the bushing (14) and the non-drive inner bushing (12) are connected by a transmission key (11). The bushing (14) is fitted with a sealing cover (3) on its outer periphery. The sealing cover (3) is provided with a cooling inner ring (17). The bushing (14) is interference-fitted with a floating ring assembly (7), and a rotating ring assembly (8) is installed at the end of the floating ring assembly (7). The rotating ring assembly (8) is fitted with a rotating ring outer sleeve (10) on its outer periphery. A pin (4) is installed between the inner wall of the sealing cover (3) and the floating ring assembly (7), and a spring (5) is fitted on the outer periphery of the pin (4).

2. The positioning transmission device for maintaining sealing accuracy according to claim 1, characterized in that: The sealing cap (3) is detachably connected to a positioning plate (1) on the side of its end, and a screw A (2) is screwed between the positioning plate (1) and the sealing cap (3). An O-ring A is fitted on the inner wall of the sealing cap (3) near the floating ring assembly (7).

3. The positioning transmission device for maintaining sealing accuracy according to claim 1, characterized in that: An O-ring B (9) is installed between the rotating ring assembly (8) and the bushing (14). A fluororubber ring (13) is embedded in the inner circumference of the bushing (14), and the fluororubber ring (13) is located at the connection between the bushing (14) and the non-drive inner bushing (12).

4. The positioning transmission device for maintaining sealing accuracy according to claim 1, characterized in that: O-rings C (15) and E (19) are respectively fitted at both ends of the connection between the outer periphery of the cooling inner ring (17) and the sealing cover (3). O-ring D (16) is fitted at the side connection of the sealing cover (3). Screw B (18) is screwed between the sealing cover (3) and the cooling inner ring (17), and a plug (26) is detachably connected to the outer periphery of the sealing cover (3) near the end of screw B (18).

5. A positioning transmission device for maintaining sealing accuracy according to claim 1, characterized in that: The sealing cap (3) is detachably connected to a nut A (20) on the side of its end. A clamping disc assembly (21) is provided on the outer periphery of the nut A (20), and a screw C (22) is screwed into the clamping disc assembly (21). A stud (25) is provided on the side of the sealing cap (3), and a nut B (23) is screwed into the stud (25). An elastic washer (24) is fitted on the side of the nut B (23) and sleeved on the outer periphery of the stud (25). An O-ring F (27) is installed between the non-drive inner bushing (12) and the shaft.

6. A positioning transmission device for maintaining sealing accuracy according to claim 1, characterized in that: The sealing cap (3) is provided with a cooling water inlet pipe (28) and a cooling water outlet pipe (29) on both sides of the top.

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