A medium and high speed industrial gear box mechanical seal device

Abstract

The utility model relates to sealing device technical field, concretely relates to a kind of medium, high-speed industrial gear box mechanical sealing device, comprising: with the synchronous rotation of the shaft of gear box's dynamic ring seat;Dynamic ring is reversibly installed on the dynamic ring seat, and the dynamic ring has the first sealing end face and the second sealing end face opposite each other;With the cover of gear box opposite fixedly set static ring;Elastic component, it is used to apply axial thrust to the static ring, so that the sealing end face of the static ring and the sealing end face of dynamic ring keep adhering to each other.The utility model is by the dynamic ring of reversible and the design of the helical groove group of different rotation direction of its two sides, so that single sealing device can be perfectly adapted to the positive and negative rotation working condition of shaft, only need to turn over dynamic ring to complete direction switching, fundamentally solve the industry problem of performance failure of one-way helical groove seal when reversing, in any working direction, device can form stable dynamic pressure liquid film by corresponding upstream pumping helical groove group.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and in particular to a mechanical seal device for medium and high speed industrial gearboxes. Background Technology

[0002] As a core transmission component of heavy equipment, the dynamic sealing reliability of the output shaft of an industrial gearbox is crucial. To improve sealing performance, upstream pumping spiral groove technology has been widely used in the field of mechanical seals. For example, Chinese patent document CN114017489A discloses an "application of a dynamic pressure spiral groove sealing surface mechanical seal in a vacuum pump," which has a set of logarithmic spiral grooves machined on the sealing surface of the rotating or stationary ring in the same direction as the shaft rotation. The pumping effect generated by the spiral grooves forms a liquid film, allowing the mechanical seal surface to rub in a fully liquid state, effectively preventing dry friction and temperature rise, and improving the seal's service life.

[0003] However, the existing technology and similar spiral groove sealing solutions have an inherent drawback: the pumping effect of the spiral groove is strictly directional. When the seal is applied to an industrial gearbox that must rotate in both directions, if the rotation direction is opposite to the spiral groove design direction, not only will an effective sealing liquid film not be formed, but leakage will be aggravated, leading to rapid seal failure.

[0004] Therefore, there is an urgent need in this field for an innovative mechanical seal solution that can adapt to changes in shaft rotation direction while retaining the excellent performance of spiral groove seals. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a mechanical seal device for medium and high speed industrial gearboxes to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides a mechanical seal device for medium- and high-speed industrial gearboxes, comprising: A rotating ring seat that rotates synchronously with the shaft of the gearbox; A rotating ring is rotatably mounted on the rotating ring seat, the rotating ring having a first sealing end face and a second sealing end face that are opposite to each other; A stationary ring fixedly disposed relative to the cover plate of the gearbox; An elastic component is used to apply an axial thrust to the stationary ring so that the sealing end face of the stationary ring remains in contact with either sealing end face of the rotating ring. The first upstream pumping spiral groove assembly is provided on the first sealing end face to adapt to the forward rotation of the shaft; The second upstream pumping spiral groove assembly is located on the second sealing end face to adapt to the reverse rotation of the shaft. By flipping the rotating ring on the rotating ring seat, the first sealing end face or the second sealing end face can be switched as the working end face to adapt to the change of the shaft rotation direction.

[0007] As a preferred technical solution of this utility model, the moving ring seat has a mounting groove for mounting the moving ring on the side facing the stationary ring, the mounting groove is provided with at least one anti-rotation pin, and the moving ring is provided with a pin hole that cooperates with the anti-rotation pin.

[0008] As a preferred embodiment of this utility model, the spiral directions of the first upstream pumping spiral groove group and the second upstream pumping spiral groove group are opposite.

[0009] As a preferred embodiment of this invention, the elastic component comprises multiple springs evenly distributed along the circumferential direction to provide a constant axial thrust and compensate for axial movement of the shaft.

[0010] As a preferred embodiment of this invention, the sealing end faces of the dynamic ring and the stationary ring are made of hard alloy.

[0011] As a preferred technical solution of this utility model, the device further includes a V-shaped sealing ring for providing a sealing effect when the stationary ring and the rotating ring seal fails. The V-shaped sealing ring is mounted on the shaft under tension and rotates with it. The lip of the V-shaped sealing ring is tightly attached to the cover plate 4 to form a seal.

[0012] As a preferred embodiment of this utility model, a stationary ring sealing ring is provided between the stationary ring and the cover plate.

[0013] As a preferred embodiment of this utility model, a cover sealing ring is provided between the cover plate and the end face of the gearbox.

[0014] As a preferred embodiment of this utility model, the stationary ring is equipped with a stationary ring guide pin, which is used to cooperate with the guide groove opened on the cover plate to restrict the rotation of the stationary ring relative to the cover plate while guiding the stationary ring to slide.

[0015] The beneficial effects of this utility model are as follows: Through the design of a reversible rotating ring and a spiral groove assembly with different directions of rotation on both sides, this utility model enables a single sealing device to perfectly adapt to the forward and reverse rotation conditions of the shaft. The direction switching can be completed simply by flipping the rotating ring, which fundamentally solves the industry problem of performance failure of unidirectional spiral groove seals when reversing. In any working direction, the device can form a stable hydrodynamic liquid film through the corresponding upstream pumping spiral groove assembly, ensuring low wear and long service life under non-contact operation. Combined with hard alloy end face, multi-spring compensation and multiple auxiliary seals such as V-shaped sealing ring and stationary ring sealing ring, it achieves a comprehensive technical effect of long service life and high adaptability to working conditions under the premise of high reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the main cross-section of the present invention; Figure 2 This is a schematic diagram of the front structure of the moving ring of this utility model; Figure 3 for Figure 1 Schematic diagram of a local structure in the middle; Figure 4 This is a schematic diagram of the reverse side structure of the moving ring of this utility model. The markings in the diagram are: 1. V-shaped sealing ring; 2. Spring; 3. Stationary ring sealing ring; 4. Cover plate; 5. Stationary ring guide pin; 6. Stationary ring; 7. Cover plate sealing ring; 8. Rotary ring; 9. Rotary ring anti-rotation pin; 10. Rotary ring seat; 11. Upstream pumping spiral groove; 12. Pin hole; 13. Mounting groove; 14. Guide groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] like Figure 1 , Figure 2 and Figure 3As shown, a mechanical seal device for a medium- and high-speed industrial gearbox includes: a rotating ring seat 10 that rotates synchronously with the gearbox shaft; a rotating ring 8 that is rotatably mounted on the rotating ring seat 10, the rotating ring 8 having a first sealing end face and a second sealing end face that are opposite to each other; a stationary ring 6 that is fixedly disposed relative to the cover plate 4 of the gearbox; an elastic component for applying an axial thrust to the stationary ring 6 so that the sealing end face of the stationary ring 6 is in contact with either sealing end face of the rotating ring 8; a first upstream pumping spiral groove assembly disposed on the first sealing end face for adapting to the forward rotation of the shaft; and a second upstream pumping spiral groove assembly disposed on the second sealing end face for adapting to the reverse rotation of the shaft. By rotating the rotating ring 8 on the rotating ring seat 10, the first sealing end face or the second sealing end face can be switched as the working end face to adapt to the switching of the shaft's rotation direction. The above technical solution solves the industry problem of traditional unidirectional spiral groove mechanical seals being unable to adapt to changes in shaft rotation direction, leading to seal failure or a sharp decline in performance during reverse rotation. Specifically, its working principle is as follows: When the gearbox rotation direction needs to be changed, the operation steps are: remove the rotating ring 8 from the rotating ring seat 10, rotate it 180 degrees, and reinstall it. This causes the first sealing end face, originally in the working position, to switch to the non-working position, while the second sealing end face, originally in the non-working position, switches to the working position, forming a new main sealing pair with the end face of the stationary ring 6 under the thrust of the elastic component. This gives the single sealing device bidirectional adaptability, significantly improving the equipment's versatility and reducing spare parts inventory and maintenance complexity.

[0021] like Figure 3 As shown, in this embodiment, the moving ring seat 10 has a mounting groove 13 for mounting the moving ring 8 on its side facing the stationary ring 6. The mounting groove 13 has at least one anti-rotation pin 9, and the moving ring 8 has a pin hole 12 that cooperates with the anti-rotation pin 9. The above technical solution solves the technical problem of ensuring reliable transmission in both working positions of the reversible rotating ring 8. Specifically, its working principle is to achieve circumferential positioning and torque transmission of the rotating ring 8 through the cooperation of the pin hole 12 and the anti-rotation pin 9. During operation, regardless of which side of the rotating ring 8 faces the stationary ring 6, the anti-rotation pin 9 can be embedded in the corresponding pin hole 12, ensuring that the rotating ring 8 and the rotating ring seat 10 rotate synchronously without relative slippage. Simultaneously, the split design separates the expensive friction pair materials from the support structure, requiring only the use of high-performance hard alloy or ceramic for the rotating ring 8, while the rotating ring seat 10 can use ordinary steel, with torque transmitted through the rotating ring anti-rotation pin 9. This significantly reduces manufacturing costs, simplifies maintenance and replacement procedures, and ensures transmission reliability through the rotating ring anti-rotation pin 9.

[0022] like Figure 2 and Figure 4As shown, in this embodiment, the first upstream pumping spiral groove group and the second upstream pumping spiral groove group have opposite spiral directions, that is, they are precisely mirror-symmetrical with respect to the central cross-section of the moving ring 8. Both the first and second upstream pumping spiral groove groups are composed of multiple upstream pumping spiral grooves 11 arranged in a circular array. Regarding the specific design of the spiral grooves 11, their number is not a fixed value, but is determined by matching the sealing end face dimensions of the moving ring 8. The core design principle is to control the groove width ratio—that is, the ratio of the effective width of the distribution area of ​​the upstream pumping spiral grooves 11 to the width of the entire sealing end face. To obtain the best dynamic pressure effect and sealing performance, the optimized value range of this groove width ratio is around 0.5. Accordingly, when the diameter of the sealing ring is large, the number of spiral grooves 11 will be increased accordingly to maintain this optimal ratio. In a preferred embodiment, the number of upstream pumping spiral grooves 11 in each group is 8, the groove depth is 5mm, and the inclination angle of the spiral groove is 17°. This set of parameters is optimized for common medium-sized industrial gearbox operating conditions to achieve a stable liquid film and effective upstream pumping effect. The above technical solution solves the problem of incorrect pumping direction and seal damage when the upstream pumping spiral groove 11 reverses in a single direction. Specifically, its working principle utilizes the specificity of the spiral groove direction to determine the direction of the pumping effect. During operation, when the shaft rotates forward, the first upstream pumping spiral groove group generates an inward pumping force to form a sealing liquid film; when the shaft rotates in reverse, the second upstream pumping spiral groove group, which is in the working position after being flipped, generates the same inward pumping force. This ensures that the gearbox can establish an effective dynamic pressure seal by the corresponding spiral groove group under both forward and reverse rotation conditions, achieving a bidirectional high-performance seal.

[0023] like Figure 3 As shown, in this embodiment, the elastic component is a plurality of springs 2 evenly distributed along the circumferential direction. Preferably, the number of springs 2 is 8 and they are arranged in a ring with the axis of the shaft as the center, so as to provide a constant axial thrust and compensate for the axial movement of the shaft. A stationary ring guide pin 5 is installed on the stationary ring 6 to guide and prevent rotation. The stationary ring guide pin 5 is used to cooperate with the guide groove 14 opened on the cover plate 4 to restrict the rotation of the stationary ring 6 relative to the cover plate 4 while guiding the stationary ring 6 to slide. The above technical solution can solve the problems of uneven load and axial movement impact that may cause instantaneous separation or overload of the sealing surface due to a single spring 2. Specifically, its working principle is as follows: multiple springs 2 work together to provide a balanced and continuous axial thrust, ensuring the initial sealing and follow-up compensation of the end faces of the stationary ring 6 and the rotating ring 8. During operation, when the shaft moves axially, the elastic deformation of the spring 2 can effectively absorb this displacement, keeping the sealing surface contact force within a reasonable range. At the same time, a guide groove is opened on the cover plate 4, which makes the stationary ring 6 more gentle when compensating, providing a constant sealing force, adapting to the dynamic working conditions of the gearbox, and avoiding rigid impact damage to the sealing end face. Furthermore, in this embodiment, the sealing end faces of the rotating ring 8 and the stationary ring 6 are made of hard alloy. The above technical solution addresses the potential brittle fracture risk and insufficient wear resistance of materials such as alumina ceramics under extreme conditions. Specifically, its working principle utilizes the extremely high hardness, wear resistance, and good heat resistance of cemented carbide. During operation, even under certain conditions where the sealing end faces experience slight contact, cemented carbide effectively resists wear and particulate erosion. This significantly improves the wear and erosion resistance of the sealing end faces, extending their service life under harsh conditions.

[0024] like Figure 1 and Figure 3 As shown, in this embodiment, the device also includes a secondary seal, which is a V-shaped sealing ring 1 disposed on the shaft. The V-shaped sealing ring 1 is directly mounted on the shaft by tension and rotates together with the shaft. The lip of the V-shaped sealing ring 1 is tightly attached to the cover plate 4 to form a seal. The above technical solution can solve the potential leakage risk problem of a single main seal. Specifically, its working principle is as an independent secondary sealing defense line. During operation, the lip of the V-shaped sealing ring 1 is interference-fitted with the relevant components, so even in the case of extreme failure of the main seal (i.e., the hydrodynamic seal composed of the moving ring 8 and the stationary ring 6), it can still provide an effective sealing effect, greatly improving the safety margin and reliability of the entire sealing device and achieving multiple sealing protections.

[0025] like Figure 3 As shown, in this embodiment, a stationary ring sealing ring 3 is provided between the stationary ring 6 and the cover plate 4; The above technical solution can solve the problem of leakage in the auxiliary path of the main seal. Specifically, its working principle is to achieve static and dynamic sealing between the stationary ring 6 and the mounting cavity. During operation, the stationary ring seal 3 prevents lubricating oil from leaking from the assembly gap between the outer circumference of the stationary ring 6 and the cover plate 4. This ensures that the medium in the main sealing area is completely confined between the end faces, improving the overall sealing effectiveness.

[0026] like Figure 1 and Figure 3As shown, in this embodiment, a cover plate sealing ring 7 is provided between the cover plate 4 and the end face of the gearbox; The above technical solution can solve the leakage problem at the interface between the sealing device and the main unit. Specifically, its working principle is to achieve a static seal between the entire sealing device and the gearbox body. During operation, the cover plate sealing ring 7 is compressed between the cover plate 4 and the gearbox body, preventing lubricating oil inside the gearbox from leaking outwards along this installation interface. The sealing system is completely enclosed inside the gearbox as a whole, completely eliminating external leakage paths.

[0027] It is particularly important to note that the design of the first and second upstream pumping spiral groove assemblies is crucial for achieving zero leakage or zero escape functionality in this field. According to the design theory of upstream pumping mechanical seals, the key lies in determining the geometric parameters such as the diameter and depth of the hydrodynamic grooves to ensure a zero-leakage seal, and selecting a suitable buffer fluid. In this embodiment, for lubricating oil commonly used in industrial gearboxes (a liquid with a certain viscosity and not easily vaporized), the specific parameters such as the diameter and depth of the spiral groove 11 were optimized and determined through theoretical calculations and experimental verification to ensure that sufficient hydrodynamic opening force can be generated within the set operating speed and pressure range, dynamically balancing the closing force and forming a stable liquid film gap.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0029] This utility model aims to cover all such substitutions, modifications, and variations that fall within its protection scope. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within its protection scope.

Claims

1. A mechanical seal device for medium- and high-speed industrial gearboxes, characterized in that, include: A rotating ring seat (10) that rotates synchronously with the shaft of the gearbox; A rotating ring (8) is rotatably mounted on the rotating ring seat (10), the rotating ring (8) having a first sealing end face and a second sealing end face that are opposite to each other; A stationary ring (6) is fixedly disposed relative to the cover plate (4) of the gearbox; An elastic component is used to apply an axial thrust to the stationary ring (6) so that the sealing end face of the stationary ring (6) is in contact with either sealing end face of the rotating ring (8); The first upstream pumping spiral groove assembly is provided on the first sealing end face to adapt to the forward rotation of the shaft; The second upstream pumping spiral groove assembly is provided on the second sealing end face to adapt to the reverse rotation of the shaft. By rotating the rotating ring (8) on the rotating ring seat (10), the first sealing end face or the second sealing end face can be switched as the working end face to adapt to the rotation direction switching of the shaft.

2. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The moving ring seat (10) has a mounting groove (13) for mounting the moving ring (8) on its side facing the stationary ring (6). The mounting groove (13) has at least one anti-rotation pin (9), and the moving ring (8) has a pin hole (12) that cooperates with the anti-rotation pin (9).

3. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The spiral directions of the first upstream pumping spiral groove group and the second upstream pumping spiral groove group are opposite.

4. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The elastic component consists of multiple springs (2) evenly distributed along the circumference to provide a constant axial thrust and compensate for axial movement of the shaft.

5. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The sealing end faces of the moving ring (8) and the stationary ring (6) are made of hard alloy.

6. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The device also includes a V-shaped sealing ring (1) for providing a sealing effect when the seal between the stationary ring (6) and the rotating ring (8) fails. The V-shaped sealing ring (1) is mounted on the shaft by tension and rotates with it. The lip of the V-shaped sealing ring (1) is in close contact with the cover plate (4) to form a seal.

7. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, A stationary ring sealing ring (3) is provided between the stationary ring (6) and the cover plate (4).

8. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, A cover plate sealing ring (7) is provided between the cover plate (4) and the end face of the gearbox.

9. The mechanical seal device for medium and high-speed industrial gearboxes according to claim 1, characterized in that, The stationary ring (6) is equipped with a stationary ring guide pin (5), which is used to cooperate with the guide groove (14) opened on the cover plate (4) to restrict the rotation of the stationary ring (6) relative to the cover plate (4) while guiding the stationary ring (6) to slide.

Images