Non-contact combined labyrinth seal structure for gearboxes

Abstract

The application discloses a non-contact combined labyrinth sealing structure for a gear box, and belongs to the sealing structure for the gear box. In order to solve the problems that the service life of the gear box is short, the gear box needs to be replaced regularly, and the cost of the non-contact sealing structure is high, the combined labyrinth sealing ring is installed at the port opposite to the rotating shaft of the gear box and is coaxially sleeved on the rotating shaft; the stepped oil throwing ring is coaxially sleeved on the rotating shaft, a plurality of inclined annular rings are arranged on the combined labyrinth sealing ring in a concentric mode, a radial labyrinth oil collecting groove is formed between two adjacent inclined annular rings, a plurality of axial labyrinth sealing grooves are formed on the combined labyrinth sealing ring, an oil return hole is formed on the combined labyrinth sealing ring, the axial labyrinth sealing grooves are communicated with the oil return hole, and the stepped oil throwing ring is provided with a plurality of stepped stages, each stepped stage is arranged opposite to a stepped oil collecting groove on the combined labyrinth sealing ring. The application is mainly used for the sealing of the gear box and the rotating shaft.

Description

Technical Field

[0001] This invention pertains to sealing structures for gearboxes, and particularly relates to a non-contact combined labyrinth sealing structure for gearboxes. Background Technology

[0002] Seals are essential structures used at the input and output ends of the rotating shaft of a gearbox to isolate the lubricating oil inside the gearbox from the outside environment and prevent leakage. Generally, they are classified into contact seals, non-contact seals, and shaftless seals. Contact seals are generally divided into packing seals, expansion ring seals, and mechanical seals. Their structure mainly uses the contact between the moving and stationary rings to generate sliding friction. Wear-resistant materials are typically used to rub against the contact surfaces to achieve a sealing effect. A characteristic of non-contact seals is their relatively short lifespan, requiring periodic replacement. Non-contact seals are generally divided into labyrinth seals, spiral seals, and centrifugal seals. Fluid media can be added to achieve a sealing effect, such as injecting special gases or water. The sealing principle mainly relies on the centrifugal force of the rotating shaft or the pressure difference generated between the moving and stationary parts to achieve a sealing effect. Because there is no contact between the moving and stationary parts, their service life is long, and wear is generally not a problem. However, adding a sealing medium requires a special mechanism that works continuously during gearbox operation, which is costly and unsuitable for ordinary gearboxes. If only ordinary non-contact sealing is used, the sealing effect is poor, and oil leakage still occurs in gearboxes with large flow rates or high speeds. This situation happens frequently. Since the manufacturing cost of ordinary gearboxes is low, it is necessary to find a sealing method with a simple structure and low processing cost to meet the sealing requirements of gearboxes. Summary of the Invention

[0003] The technical problem to be solved by this invention is that: the gearbox uses a contact seal, which has a short lifespan and needs to be replaced regularly; the non-contact seal structure is costly and not suitable for ordinary gearbox applications; therefore, a non-contact combined labyrinth seal structure for gearboxes is proposed.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] A non-contact combined labyrinth seal structure for a gearbox includes a combined labyrinth seal ring and a stepped oil slinger ring. The combined labyrinth seal ring is installed at the port of the gearbox opposite to the rotating shaft and is coaxially fitted onto the rotating shaft. The stepped oil slinger ring is coaxially fitted onto the rotating shaft and positioned close to the combined labyrinth seal ring, with a certain gap between the stepped oil slinger ring and the combined labyrinth seal ring. Several concentric inclined rings are arranged on the end face of the combined labyrinth seal ring facing the stepped oil slinger ring, with a radial labyrinth formed between two adjacent inclined rings. The oil collection groove has several axial labyrinth sealing grooves on the side wall opposite to the rotating shaft of the combined labyrinth sealing ring. The several axial labyrinth sealing grooves are arranged coaxially. An oil return hole is opened on the combined labyrinth sealing ring, and the several axial labyrinth sealing grooves are connected to the oil return hole. The stepped oil slinger ring has several stepped steps arranged from the inside to the outside on the side end face facing the combined labyrinth sealing ring. Each stepped step is arranged opposite to the stepped oil collection groove on the combined labyrinth sealing ring, and the whole forms a medium storage sealing cavity. The oil return hole is connected to the medium storage sealing cavity.

[0006] Furthermore, the axial labyrinth sealing groove consists of two parts.

[0007] Furthermore, the aforementioned inclined circular rings are arranged in a stepped manner from the inside out.

[0008] Furthermore, the inclined rings are ring one, ring two, and ring three; the height of ring one is less than the height of ring two, and the height of ring two is less than the height of ring three; a radial labyrinth oil collection groove one is formed between ring one and ring two, and a radial labyrinth oil collection groove two is formed between ring two and ring three. The radial labyrinth oil collection groove one and the radial labyrinth oil collection groove two are arranged in a stepped manner to form a stepped oil collection groove.

[0009] Furthermore, the depth of the first radial labyrinth oil collecting groove is less than the depth of the second radial labyrinth oil collecting groove.

[0010] Furthermore, a radial labyrinth oil collection groove is formed between the circular ring three and the end face of the combined labyrinth sealing ring facing the stepped oil slinger ring.

[0011] Furthermore, the aforementioned stepped steps are designated as Step 1 and Step 2, with Step 2 having a lower height than Step 1. Step 1 is positioned opposite to Ring 1 and Radial Labyrinth Oil Collection Tank 1, and a narrow channel 1 is formed between Step 1 and the inner walls of Ring 1 and Ring 2. Step 2 is positioned opposite to Ring 2 and Radial Labyrinth Oil Collection Tank 2, and a narrow channel 2 is formed between Step 2 and the inner walls of Ring 2 and Ring 3. The narrow channel 1 and narrow channel 2 form an inflow channel and a flow-out channel for the medium.

[0012] The beneficial effects of this invention compared to the prior art are:

[0013] 1. This invention designs a stepped inclined radial labyrinth seal structure. The radial labyrinth seal incorporates a stepped structure that works in conjunction with a stepped oil slinger ring. The inclined design of the radial labyrinth seal creates an oil collection groove effect, preventing cross-flow of lubricating medium between the stepped seals. Finally, an axial sealing structure is added to prevent leakage of the final lubricating medium, thereby achieving the isolation of the lubricating medium and improving the sealing effect.

[0014] 2. The present invention designs a multi-layer oil storage cavity structure, which can effectively prevent the internal fluid lubrication medium from leaking outward along the box wall and the rotation axis during gearbox operation. It is a new technology with low manufacturing cost, simple installation, high reliability, high sealing efficiency and stable performance, and is especially suitable for high-speed transmission applications.

[0015] 3. The sealing structure of the present invention is mainly used for sealing the ends of the input or output shafts of the gearbox. Compared with the traditional single labyrinth seal structure, it can achieve a good sealing effect. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are provided to further illustrate the invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the sealing principle of the combined labyrinth sealing structure of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1-Labyrinth seal ring; 11-Inclined ring; 111-Ring one; 112-Ring two; 113-Ring three; 12-Radial labyrinth oil collection groove; 121-Radial labyrinth oil collection groove one; 122-Radial labyrinth oil collection groove two; 123-Radial labyrinth oil collection groove three; 13-Axial labyrinth seal groove; 14-Return oil hole; 2-Stepped oil slinger ring; 21-Step one; 22-Step two; 3-Gearbox; 4-Rotating shaft; 5-Media storage sealing cavity; 6-Narrow channel one; 7-Narrow channel two. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] See Figure 1 and Figure 2This application provides a non-contact combined labyrinth seal structure for a gearbox, which includes a combined labyrinth seal ring 1 and a stepped oil slinger ring 2. The combined labyrinth seal ring 1 is bolted to the port of the gearbox 3 opposite to the rotating shaft 4 and is coaxially sleeved on the rotating shaft 4. The stepped oil slinger ring 2 is coaxially sleeved on the rotating shaft 4 and is located close to the combined labyrinth seal ring 1. A certain gap is left between the stepped oil slinger ring 2 and the combined labyrinth seal ring 1 to ensure that the rotating shaft 4 will not rub against the combined labyrinth seal ring 1 during operation.

[0022] See Figure 1 The combined labyrinth seal ring 1 has several concentric inclined rings 11 on one end face facing the stepped oil slinger ring 2. The inclined rings 11 are arranged in a stepped manner from the inside to the outside, and a radial labyrinth oil collection groove 12 is formed between two adjacent inclined rings 11. The combined labyrinth seal ring 1 has several axial labyrinth seal grooves 13 on the side wall opposite to the rotating shaft 4. The axial labyrinth seal grooves 13 are arranged coaxially. An oil return hole 14 is opened on the combined labyrinth seal ring 1, and the axial labyrinth seal grooves 13 communicate with the oil return hole 14.

[0023] See Figure 1 The inclined rings 11 are ring one 111, ring two 112, and ring three 113. The height of ring one 111 is less than the height of ring two 112, and the height of ring two 112 is less than the height of ring three 113. A radial labyrinth oil collection groove one 121 is formed between ring one 111 and ring two 112, a radial labyrinth oil collection groove two 122 is formed between ring two 112 and ring three 113, and a radial labyrinth oil collection groove three 123 is formed between ring three 113 and the end face of the combined labyrinth sealing ring 1 facing the stepped oil slinger ring 2. The radial labyrinth oil collection groove one 121 and radial labyrinth oil collection groove two 122 are arranged in a stepped manner to form a stepped oil collection groove. The depth of radial labyrinth oil collection groove one 121 is less than the depth of radial labyrinth oil collection groove two 122.

[0024] See Figure 1The stepped oil slinger ring 2 has several stepped steps arranged from the inside out on one end face facing the combined labyrinth seal ring 1. Each stepped step is arranged opposite to a stepped oil collecting groove on the combined labyrinth seal ring 1, forming a medium storage sealing cavity 5. The oil return hole 14 communicates with the medium storage sealing cavity 5. The stepped steps are respectively step one 21 and step two 22, and the height of step two 22 is less than the height of step one 21. Step 21 is arranged opposite to Annulus 111 and Radial Labyrinth Oil Collection Tank 121, and a narrow channel 6 is formed between Step 21 and the inner wall of Annulus 111 and Annulus 212. Step 22 is arranged opposite to Annulus 212 and Radial Labyrinth Oil Collection Tank 222, and a narrow channel 27 is formed between Step 22 and the inner wall of Annulus 212 and Annulus 313. The narrow channel 6 and the narrow channel 27 form an inflow channel and a flow channel.

[0025] In this embodiment, the combined labyrinth seal ring 1 is used as the stationary ring, and the stepped oil-throwing ring 2 is used as the rotating ring. The rotating ring of this sealing structure is installed on the rotating shaft 4. Three layers of centrifugal structures are set on the rotating ring. When the shaft rotates at high speed, the centrifugal force generated by the rotation of the centrifugal structures throws out the lubricating medium. On the stationary ring, at the position corresponding to the centrifugal structure of the rotating ring, three oil storage chambers (radial labyrinth oil collection groove one 121, radial labyrinth oil collection groove two 122, and radial labyrinth oil collection groove three 123) are set. It should be noted that the centrifugal structure of the rotating ring and the oil storage chamber of the stationary ring must be used in pairs. The lubricating medium thrown out by the centrifugal structure will fall into the oil storage chamber on the stationary ring. Each oil storage chamber is divided into an upper oil storage structure and a lower oil storage structure. The lubricating medium thrown into the upper oil storage structure will flow into the lower oil storage structure. When the lubricating medium in the lower oil storage structure flows to the bottom, it will not flow back to the centrifugal structure. At the same time, an oil drain hole is provided at the bottom of the oil storage chamber. The lubricating medium is finally discharged from the sealing structure through the oil drain hole, achieving the sealing effect.

[0026] In this embodiment, the combination of the radial labyrinth oil collection groove 12 and the axial labyrinth sealing groove 13 forms a sealing structure that blocks the lubricating medium inside the gearbox 3 and isolates it from the outside atmosphere.

[0027] The following further explains the working process of the present invention to further demonstrate its working principle and advantages:

[0028] When the rotating shaft 4 rotates together with the stepped oil slinger ring 2, the lubricating medium inside the gearbox 3 will flow through this sealing structure along different paths. First, the lubricating medium flowing along the box wall will be blocked by the radial labyrinth oil collection groove 123 and flow back to the bottom of the box in the circumferential direction. Second, the lubricating medium flowing along the rotating shaft 4 will be thrown out by the stepped oil slinger ring 2 and will not enter the sealing structure. Third, the lubricating medium splashed by the operation of the gearbox 3 will enter this sealing structure through the narrow channel 7. The lubricating medium entering the sealing structure will flow into the radial labyrinth oil collection groove 121, the narrow channel 6, and the radial labyrinth oil collection groove 122 respectively. Due to the narrow channel 7 The gap between the narrow channel 16 and the main channel 7 is small, resulting in a very low flow rate of the lubricating medium. Through layers of obstruction, the amount of lubricating medium flowing into the axial labyrinth seal groove 13 is greatly reduced. The obstructed lubricating medium flows into the radial labyrinth oil collection groove 121 and the radial labyrinth oil collection groove 122. The lubricating medium in the radial labyrinth oil collection groove 121 and the radial labyrinth oil collection groove 122 flows back into the housing through the bottom narrow channels 16 and 7. Even if a small amount of lubricating medium flows into the axial labyrinth seal groove 13, it will be blocked by its sealing structure and finally flow back into the housing through the bottom return oil hole 14 along the bottom narrow channels 16 and 7. Through multiple obstructions, the lubricating fluid is difficult to leak. Simultaneously, the centrifugal effect generated by the step-by-step rotation of the stepped oil slinger rings ultimately achieves a sealing effect.

[0029] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A non-contact combined labyrinth seal structure for gearboxes, characterized in that: It includes a combined labyrinth seal ring (1) and a stepped oil slinger ring (2). The combined labyrinth seal ring (1) is installed at the port opposite to the rotating shaft (4) of the gearbox (3) and is coaxially sleeved on the rotating shaft (4). The stepped oil slinger ring (2) is coaxially sleeved on the rotating shaft (4) and is set close to the combined labyrinth seal ring (1). A certain gap is left between the stepped oil slinger ring (2) and the combined labyrinth seal ring (1). The combined labyrinth seal ring (1) has several concentric inclined rings (11) on one end face facing the stepped oil slinger ring (2). A radial labyrinth oil collecting groove (12) is formed between two adjacent inclined rings (11). Several axial labyrinth sealing grooves (13) are opened on the side wall of the combined labyrinth seal ring (1) opposite to the rotating shaft (4). The several axial labyrinth sealing grooves (13) are coaxially arranged. An oil return hole (14) is opened on the top, and the several axial labyrinth sealing grooves (13) are connected to the oil return hole (14); the stepped oil slinger ring (2) has several stepped steps arranged from the inside to the outside on the side end face facing the combined labyrinth sealing ring (1), and each stepped step is arranged opposite to the stepped oil collection groove on the combined labyrinth sealing ring (1), forming a medium storage sealing cavity (5) as a whole, and the oil return hole (14) is connected to the medium storage sealing cavity (5).

2. The non-contact combined labyrinth seal structure for gearboxes according to claim 1, characterized in that: The axial labyrinth seal groove (13) consists of two parts.

3. The non-contact combined labyrinth seal structure for gearboxes according to claim 2, characterized in that: The aforementioned inclined rings (11) are arranged in a stepped manner from the inside out.

4. The non-contact combined labyrinth seal structure for a gearbox according to claim 3, characterized in that: The inclined rings (11) are ring one (111), ring two (112) and ring three (113); the height of ring one (111) is less than the height of ring two (112), and the height of ring two (112) is less than the height of ring three (113); a radial labyrinth oil collection groove one (121) is formed between ring one (111) and ring two (112), and a radial labyrinth oil collection groove two (122) is formed between ring two (112) and ring three (113). The radial labyrinth oil collection groove one (121) and radial labyrinth oil collection groove two (122) are arranged in a stepped manner to form a stepped oil collection groove.

5. A non-contact combined labyrinth seal structure for a gearbox according to claim 4, characterized in that: The depth of the first radial labyrinth oil collection trough (121) is less than the depth of the second radial labyrinth oil collection trough (122).

6. The non-contact combined labyrinth seal structure for a gearbox according to claim 5, characterized in that: The circular ring three (113) and the end face of the combined labyrinth seal ring (1) facing the stepped oil slinger ring (2) form a radial labyrinth oil collection groove three (123).

7. A non-contact combined labyrinth seal structure for a gearbox according to claim 6, characterized in that: The aforementioned stepped steps are Step 1 (21) and Step 2 (22), the height of Step 2 (22) is less than the height of Step 1 (21); Step 1 (21) is arranged opposite to Ring 1 (111) and Radial Labyrinth Oil Collection Tank 1 (121), and a narrow channel 1 (6) is formed between Step 1 (21) and the inner wall of Ring 1 (111) and Ring 2 (112); Step 2 (22) is arranged opposite to Ring 2 (112) and Radial Labyrinth Oil Collection Tank 2 (122), and a narrow channel 2 (7) is formed between Step 2 (22) and the inner wall of Ring 2 (112) and Ring 3 (113); the narrow channel 1 (6) and the narrow channel 2 (7) form an inflow channel and a flow-out channel.

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