Combined oil return sealing structure

Abstract

The utility model discloses a combined oil return sealing structure which comprises a main shaft, an oil slinger, an end cover and a labyrinth type oil seal. The main shaft is divided into a primary shaft and a secondary shaft from left to right, the radius of the primary shaft is smaller than that of the secondary shaft, the left end of the primary shaft penetrates through the transmission device, and an annular groove is formed in the right end of the primary shaft; the oil slinger is assembled on the primary shaft, the left side of the oil slinger is attached to the right side of the transmission device, and the right side of the oil slinger is attached to the left side face of the secondary shaft. The labyrinth type oil seal is installed on the secondary shaft in a clearance mode, a trapezoid ring groove and an annular boss are arranged on the outer side of the labyrinth type oil seal, the annular boss is in clearance fit with a groove in the corresponding position of the end cover, and a plurality of ring grooves are formed in an inner hole of the labyrinth type oil seal; a plurality of oil holes communicated with the annular groove are further formed in the labyrinth type oil seal, and an axial hole jointly communicated with the oil holes is further formed in the labyrinth type oil seal. According to the utility model, a sealing structure and a lubricating oil backflow path are optimized, the oil return efficiency is improved, and the risks of retention and oil degradation are reduced; meanwhile, the oil leakage risk is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of sealing technology and relates to a combined oil return sealing structure. Background Technology

[0002] The reliability and sealing performance of lubrication systems are key factors in ensuring efficient equipment operation, extending service life, and guaranteeing safety. As industrial equipment develops towards higher speeds and higher power densities, effectively preventing lubricant leakage under dynamic operating conditions while avoiding the intrusion of external contaminants has become a significant challenge in ensuring normal machinery operation. Traditional sealing solutions have several shortcomings in practical applications: lubricant tends to accumulate at labyrinth seals, turbulent flow causes low oil return efficiency, oil film rupture leads to instantaneous leakage, frictional losses are high, and maintenance costs are also high. These problems not only affect equipment operating efficiency but may also lead to frequent maintenance and high operating costs. Summary of the Invention

[0003] The purpose of this invention is to provide a combined oil return sealing structure to solve at least one problem existing in the prior art. This invention improves oil return efficiency by optimizing the sealing structure and lubricating oil return path, ensuring rapid lubricating oil return and reducing the risk of stagnation and oil deterioration. Simultaneously, it effectively reduces the risk of oil leakage, prevents contaminants from entering, and avoids environmental pollution.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A combined oil return sealing structure includes a main shaft, an oil slinger ring, an end cap, and a labyrinth seal. The main shaft is divided into a primary shaft and a secondary shaft from left to right. The radius of the primary shaft is smaller than that of the secondary shaft. The left end of the primary shaft is used to pass through a transmission device, and the right end is provided with an annular groove. The oil slinger ring is assembled on the primary shaft, and the radial cross-section of the oil slinger ring is convex. The left side of the oil slinger ring fits against the right side of the transmission device, and the right side of the oil slinger ring fits against the left side of the secondary shaft.

[0006] The labyrinth oil seal clearance is installed on the secondary shaft. The labyrinth oil seal has a trapezoidal annular groove and an annular boss on the outside. The annular boss is clearance-fitted with the groove at the corresponding position on the end cover. Multiple annular grooves are provided in the inner hole of the labyrinth oil seal. The open annular groove is clearance-fitted with the right side shaft of the oil slinger ring. The labyrinth oil seal also has multiple oil holes that communicate with the annular grooves, and an axial hole that communicates with multiple oil holes.

[0007] Furthermore, the left shaft diameter of the oil slinger ring is lower than the right shaft diameter.

[0008] Furthermore, the inner hole of the labyrinth oil seal is provided with an open annular groove, a concave annular groove, a first V-shaped annular groove, a second V-shaped annular groove, a first rectangular annular groove, a third V-shaped annular groove, a fourth V-shaped annular groove, a second rectangular annular groove, a fifth V-shaped annular groove, a sixth V-shaped annular groove, and a seventh V-shaped annular groove in sequence from left to right.

[0009] Furthermore, the labyrinth-type oil seal has radially arranged first, second, third, and fourth oil holes on one side of the two top ends of the concave annular groove, and on one side of the first and second rectangular annular grooves, respectively; the thickness and depth of the first rectangular annular groove are both greater than those of the second rectangular annular groove; the size of the second rectangular annular groove is the same as that of both ends of the concave annular groove; the first, second, and fourth oil holes have the same diameter and are slightly smaller than the third oil hole; the bottom of the first, second, third, and fourth oil holes is provided with an axial hole, and they are all connected to this axial hole. The axial hole passes through the trapezoidal annular groove on the outside of the labyrinth-type oil seal and is used for oil return to the left.

[0010] Furthermore, the left side of the labyrinth-type oil seal is an inclined surface, and the right side of the boss of the oil slinger ring is also an inclined surface. The two inclined surfaces have the same slope and form a cavity between them.

[0011] Compared to existing technologies, this invention optimizes the sealing structure and lubricating oil return path, improving oil return efficiency, ensuring rapid lubricating oil return, and reducing the risk of stagnation and oil deterioration. Simultaneously, it effectively reduces the risk of oil leakage, prevents contaminants from entering, and avoids environmental pollution. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the combined oil return seal of this utility model.

[0013] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0014] This utility model provides a combined oil return sealing structure, including a main shaft 1, an oil slinger ring 2, an end cap 3, and a labyrinth oil seal 4; wherein, the main shaft 1 is divided into two parts from left to right: a primary shaft and a secondary shaft. The radius of the primary shaft is smaller than that of the secondary shaft. The left end of the primary shaft is used to pass through the transmission device, and the right end is provided with an annular groove.

[0015] The oil slinger ring 2 is mounted on the primary shaft and the radial cross section of the oil slinger ring 2 is convex. The left side of the oil slinger ring 2 is in contact with the right side of the transmission device 5, and the right side of the oil slinger ring 2 is in contact with the left side of the secondary shaft. The shaft diameter on the left side of the oil slinger ring 2 is lower than that on the right side, which makes the inner cavity space larger and less oil enters the right side.

[0016] The labyrinth-type oil seal 4 is installed on the secondary shaft with clearance. The outer side of the labyrinth-type oil seal 4 has a trapezoidal annular groove 4-1 and an annular boss 4-2. The annular boss 4-2 is clearance-fitted with the groove at the corresponding position on the end cover 3. The inner hole of the labyrinth-type oil seal 4 is provided with multiple annular grooves, which are arranged from left to right as follows: open annular groove 4-3, concave annular groove 4-4, first V-shaped annular groove 4-5, second V-shaped annular groove 4-6, first rectangular annular groove 4-7, third V-shaped annular groove 4-8, fourth V-shaped annular groove 4-9, second rectangular annular groove 4-10, fifth V-shaped annular groove 4-11, sixth V-shaped annular groove 4-12, and seventh V-shaped annular groove 4-13. In this design, the rectangular annular groove is used for guiding and storing oil, and the V-shaped annular groove is used for storing a small amount of oil and allowing a small amount of oil to flow back into the rectangular groove, which can effectively reduce the flow rate of oil to the right side of the shaft and prevent outflow. The combination of rectangular and V-shaped annular grooves can greatly improve oil return and sealing performance; the left side of the labyrinth oil seal 4 is inclined, and the right side of the boss of the oil slinger ring 2 is also inclined. The two inclined surfaces have the same slope and form a cavity between them. This structure forms oil slinger pressure and receives a small amount of oil flowing into the labyrinth oil seal; the open annular groove 4-3 is fitted with the right side shaft clearance of the oil slinger ring 2.

[0017] The labyrinth-type oil seal 4 also includes oil holes communicating with the annular grooves. Specifically, radial oil holes 4-14, 4-15, 4-16, and 4-17 are respectively provided on one side of the two top ends of the concave annular groove 4-4, the first rectangular annular groove 4-7, and the second rectangular annular groove 4-10. The thickness and depth of the first rectangular annular groove 4-7 are greater than those of the second rectangular annular groove 4-10. The size of the second rectangular annular groove 4-10 is similar to that of the two top ends of the concave annular groove 4-4. The ends are the same; the first oil hole 4-14, the second oil hole 4-15 and the fourth oil hole 4-17 have the same diameter and are slightly smaller than the third oil hole 4-16; the bottom of the first oil hole 4-14, the second oil hole 4-15, the third oil hole 4-16 and the fourth oil hole 4-17 are all provided with an axial hole 4-18 and they are all connected to the axial hole 4-18. The axial hole 4-18 passes through the trapezoidal annular groove 4-1 on the outside of the labyrinth oil seal 4 and is used for oil return to the left.

[0018] The working principle of this utility model is as follows:

[0019] During the rotation of the transmission device 5 and the main shaft 1, the lubricating oil moves from the transmission device 5 to the return oil chamber between the oil slinger 2, the end cover 3, and the labyrinth seal 4 due to inertia. The rotation of the oil slinger 2 causes most of the lubricating oil to adhere to the inner wall of the left side of the end cover 1 and flow back to the transmission device 1 at the lower end. A small portion of the lubricating oil flows into the inner hole of the labyrinth seal 4 through the right side of the oil slinger 2. After being blocked by multiple annular grooves in the inner hole of the labyrinth seal 4, most of the lubricating oil flows into the return oil chamber through the first oil hole 4-14, the second oil hole 4-15, the third oil hole 4-16, and the fourth oil hole 4-17. A very small amount of lubricating oil flows in from the contact surface between the end cover 1 and the labyrinth seal 4, forming an oil film and achieving a seal. The oil slinger ring 2 utilizes centrifugal force to achieve active oil return during high-speed operation, reducing the risk of axial oil migration. The labyrinth oil seal 4, through a multi-stage meandering flow channel design formed by multiple annular grooves, oil holes, and axial holes, forms a gas-liquid barrier together with the external components on the right side during operation, suppressing leakage. The end cap 3 further integrates the oil return channel and oil return chamber to ensure efficient oil recovery under different operating conditions.

Claims

1. A combined oil return sealing structure, comprising a main shaft (1) and an oil slinger ring (2), characterized in that, It also includes end caps (3) and labyrinth oil seals (4); wherein, the main shaft (1) is divided into two parts from left to right: a primary shaft and a secondary shaft. The radius of the primary shaft is smaller than that of the secondary shaft. The left end of the primary shaft is used to pass through the transmission device, and the right end is provided with an annular groove; the oil slinger ring (2) is assembled on the primary shaft and the radial section of the oil slinger ring (2) is convex. The left side of the oil slinger ring (2) is in contact with the right side of the transmission device (5), and the right side of the oil slinger ring (2) is in contact with the left side of the secondary shaft; The labyrinth oil seal (4) is installed on the secondary shaft with clearance. The labyrinth oil seal (4) has a trapezoidal annular groove (4-1) and an annular boss (4-2) on the outside. The annular boss (4-2) is clearance-fitted with the groove at the corresponding position on the end cover (3). Multiple annular grooves are provided in the inner hole of the labyrinth oil seal (4). The labyrinth oil seal (4) is also provided with multiple oil holes that communicate with the annular grooves, and an axial hole (4-18) that communicates with the multiple oil holes.

2. The combined oil return sealing structure as described in claim 1, characterized in that, The diameter of the left side of the oil-slinging ring (2) is lower than that of the right side.

3. The combined oil return sealing structure as described in claim 1, characterized in that, The labyrinth oil seal (4) has an open annular groove (4-3), a concave annular groove (4-4), a first V-shaped annular groove (4-5), a second V-shaped annular groove (4-6), a first rectangular annular groove (4-7), a third V-shaped annular groove (4-8), a fourth V-shaped annular groove (4-9), a second rectangular annular groove (4-10), a fifth V-shaped annular groove (4-11), a sixth V-shaped annular groove (4-12), and a seventh V-shaped annular groove (4-13) arranged sequentially from left to right in its inner hole. The open annular groove (4-3) is fitted with the right side shaft clearance of the oil slinger ring (2).

4. The combined oil return sealing structure as described in claim 3, characterized in that, The labyrinthine oil seal (4) has a first oil hole (4-14), a second oil hole (4-15), a third oil hole (4-16), and a fourth oil hole (4-17) radially arranged on one side of the two top ends of the concave annular groove (4-4), the first rectangular annular groove (4-7), and the second rectangular annular groove (4-10); the thickness and depth of the first rectangular annular groove (4-7) are both greater than those of the second rectangular annular groove (4-10); the size of the second rectangular annular groove (4-10) is the same as that of both ends of the concave annular groove (4-4); the first oil hole ( The first oil hole (4-14), the second oil hole (4-15), and the fourth oil hole (4-17) are of equal diameter and slightly smaller than the third oil hole (4-16); the bottom of the first oil hole (4-14), the second oil hole (4-15), the third oil hole (4-16), and the fourth oil hole (4-17) are all provided with an axial hole (4-18) and they are all connected to this axial hole (4-18). The axial hole (4-18) passes through the trapezoidal annular groove (4-1) on the outside of the labyrinth oil seal (4) and is used for returning oil to the left.

5. The combined oil return sealing structure as described in claim 1, characterized in that, The left side of the labyrinth oil seal (4) is an inclined surface, and the right side of the boss of the oil slinger ring (2) is also an inclined surface. The two inclined surfaces have the same slope and form a cavity between them.

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