A sealing device for maintenance of a speed reducer oil leakage

Abstract

The application relates to the technical field of shaft end sealing, in particular to a sealing device for maintenance of gear reducer oil leakage, which comprises a shell, an output shaft, a first sealing assembly and a second sealing assembly. The first sealing assembly seals the gap between the output shaft and the shell. With the operation of the output shaft, the first sealing assembly may fail or its performance may decrease. At this time, the second sealing assembly is installed between the output shaft and the shell. The second sealing assembly can be installed without disassembling or replacing the first sealing assembly. The second sealing assembly can further seal the gap between the output shaft and the shell, and can also transport the gear oil leaked when the first sealing assembly fails or its performance decreases to the inside of the shell, so that the gear oil in the shell can keep the state of immersing the reduction gear. Under the joint action of the first sealing assembly and the second sealing assembly, the gap between the output shaft and the shell can be long-term sealed.

Description

Technical Field

[0001] This invention relates to the field of shaft end sealing technology, and more specifically to a sealing device for oil leakage maintenance of a reducer. Background Technology

[0002] In the operation of industrial equipment, the reducer, as a critical transmission component, directly affects the reliability and service life of the equipment through its shaft end sealing performance. However, existing maintenance solutions for reducer oil leakage generally suffer from drawbacks such as cumbersome disassembly and assembly, high downtime costs, sensitivity to journal wear, and a lack of effective oil return mechanisms. Especially after seal failure, traditional methods often require complete machine disassembly and replacement of the seals, severely impacting production efficiency. Furthermore, for worn shaft surfaces, conventional seals cannot guarantee long-term effective sealing, leading to continuous lubricant leakage, which not only wastes resources but also easily causes environmental pollution.

[0003] In the prior art, for example, Chinese invention patent CN108105369B discloses a sealing structure for the end of a reducer transmission shaft. This patent improves sealing reliability and reduces maintenance costs by setting spiral oil-blocking grooves inside and outside the sealing ring and combining them with a first oil return channel to guide leaked oil back to the oil tank. However, this technical solution still relies on a sealing ring that fits tightly against the journal. After the shaft surface wears or undergoes irregular deformation due to long-term operation, gaps easily form between the sealing ring and the shaft, leading to sealing failure. This cannot fundamentally solve the problem of oil leakage maintenance after journal wear. Summary of the Invention

[0004] This invention provides a sealing device for oil leakage maintenance of a reducer, which solves the problem that existing sealing devices cannot solve the problem of oil leakage after journal wear.

[0005] The sealing device for oil leakage maintenance of a reducer according to the present invention adopts the following technical solution:

[0006] A sealing device for oil leakage maintenance of a speed reducer includes a housing, an output shaft, a first sealing assembly, and a second sealing assembly.

[0007] The housing contains a reduction gear and is filled with gear oil. The output shaft rotatably passes through the housing, and one end of the output shaft inside the housing is connected to the reduction gear. The first sealing assembly seals the gap between the output shaft and the housing. The second sealing assembly further seals the gap between the output shaft and the housing when the first sealing assembly fails or its performance deteriorates. The second sealing assembly can also re-supply the gear oil that leaks when the first sealing assembly fails or its performance deteriorates back into the housing.

[0008] Furthermore, the first sealing assembly includes a first end cap and a first sealing ring. The first end cap is an integral circular ring structure, and a through hole is provided in the middle of the first end cap. The output shaft can pass through the through hole. The first sealing ring is disposed in the through hole and abuts against the outer surface of the output shaft.

[0009] Furthermore, the second sealing assembly includes a second end cap and a second sealing ring, the second end cap being fixed to the first end cap; the second sealing ring has a conical sealing portion, the conical sealing portion having a first end near the first end cap and a second end away from the first end cap, the diameter of the first end being smaller than the diameter of the second end, and the second end being fixedly connected to the second end cap.

[0010] Furthermore, both the second sealing ring and the second end cap are split structures, wherein the number of split parts of the second sealing ring is the same as the number of split parts of the second end cap, and the split second sealing ring and the split second end cap are connected in a one-to-one correspondence.

[0011] Furthermore, both the second sealing ring and the second end cap are separate structures. The second sealing ring has a clamping part, which is fixedly connected to the second end cap. The second end cap is provided with a clamping ring, which is used to fix the clamping part of the second sealing ring to the second end cap.

[0012] Furthermore, the second end cap is provided with a mounting groove, and the clamping ring can be installed in the mounting groove, with an interference fit between the clamping ring and the mounting groove.

[0013] Furthermore, the conical sealing portion of the second sealing ring is capable of deformation, and the first end of the conical sealing portion has a pressing force that abuts against the outer surface of the output shaft.

[0014] Furthermore, the second sealing assembly also includes a guide fan blade, an exhaust pipe, and a drain pipe. The second end cap has a temporary storage cavity inside, which communicates with the through hole. The exhaust pipe connects the temporary storage cavity to the external environment, and the drain pipe connects the temporary storage cavity to the inside of the housing. The exhaust pipe is located above the drain pipe. The guide fan blade is sleeved on the output shaft. When the output shaft rotates, the guide fan blade can guide the airflow to push the conical seal portion to deform, so that the gas enters the temporary storage cavity through the position of the conical seal portion. A sealing element is provided in the temporary storage cavity to seal the exhaust pipe when the amount of gear oil entering the temporary storage cavity reaches a first preset value.

[0015] Furthermore, the sealing component includes a floating ring, the temporary storage cavity is provided with a guide groove, the floating ring is provided with a slider, and the slider is slidably disposed in the guide groove; the density of the floating ring is less than the density of the gear oil, and when the amount of gear oil entering the temporary storage cavity reaches a first preset value, the floating ring slides to the state of sealing the exhaust pipe.

[0016] Furthermore, a filter screen is installed inside the drain pipe.

[0017] The beneficial effects of this invention are as follows: A sealing device for maintaining oil leakage in a reducer includes a housing, an output shaft, a first sealing assembly, and a second sealing assembly. The housing is fixedly mounted on the ground or a frame. A reduction gear is installed inside the housing, and gear oil is filled into the housing to reduce wear on the reduction gear during operation. One end of the output shaft is connected to the reduction gear inside the housing, and the other end extends to the outside of the housing. The first sealing assembly seals the gap between the output shaft and the housing. As the output shaft operates, the first sealing assembly may fail or its performance may deteriorate. In this case, a second sealing assembly is installed between the output shaft and the housing. The second sealing assembly can be installed without disassembling or replacing the first sealing assembly. The second sealing assembly can further seal the gap between the output shaft and the housing, and can also re-transport the gear oil leaking when the first sealing assembly fails or its performance deteriorates back into the housing, ensuring that the gear oil inside the housing remains submerged in the reduction gear. Under the combined action of the first and second sealing assemblies, a long-term seal is achieved between the output shaft and the housing.

[0018] Furthermore, by providing a conical sealing portion for the second sealing ring in the second sealing assembly, when the output shaft is stationary, the first end of the conical sealing portion can tightly abut against the outer surface of the output shaft. When gear oil permeates into the conical sealing portion, the restoring force of the conical sealing portion's own deformation can prevent gear oil from leaking into the external environment.

[0019] Furthermore, by setting a temporary storage cavity inside the second end cover of the second sealing assembly and setting a guide fan blade on the output shaft, the guide fan blade rotates synchronously with the output shaft when the output shaft is working normally. The guide fan blade guides the airflow to push against the conical sealing part, causing the conical sealing part to deform, thereby creating a gap between the conical sealing part and the output shaft. The airflow passes through the gap between the conical sealing part and the output shaft, thus reducing the contact between the conical sealing part and the output shaft during the rotation of the output shaft, thereby reducing the wear of the conical sealing part and the outer surface of the output shaft.

[0020] Furthermore, by installing a float block, an exhaust pipe, and a drain pipe in the temporary storage chamber, when there is no gear oil in the temporary storage chamber, all the gas entering the temporary storage chamber is discharged to the external environment through the exhaust pipe. If the amount of gear oil entering the temporary storage chamber reaches a first preset value, the float block floats to the state of blocking the exhaust port. As gas continues to enter the temporary storage chamber, the gear oil in the temporary storage chamber is transported back to the housing through the drain pipe, thereby ensuring that the gear oil in the housing remains sufficient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a sealing device for oil leakage maintenance of a speed reducer provided in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a front view of a sealing device for maintaining oil leakage in a speed reducer, provided in an embodiment of the present invention.

[0025] Figure 4 for Figure 3 Cross-sectional view along the BB direction;

[0026] Figure 5 for Figure 4 A magnified view of a section at point C;

[0027] Figure 6 This is a partial state diagram of a sealing device for oil leakage maintenance of a reducer provided in an embodiment of the present invention, in which the first sealing ring is not in failure and the output shaft is in a rotating state;

[0028] Figure 7 A partial state diagram of a sealing device for oil leakage maintenance of a reducer provided in an embodiment of the present invention, when the first sealing ring fails and the amount of gear oil entering the temporary storage chamber reaches a first preset value;

[0029] Figure 8 This is a schematic diagram of the structure of the second end cover, floating block, etc. in a sealing device for oil leakage maintenance of a reducer provided in an embodiment of the present invention;

[0030] Figure 9This is an exploded view of a portion of the structure of the second sealing assembly in a sealing device for oil leakage maintenance of a speed reducer, provided in an embodiment of the present invention.

[0031] In the figure: 110, housing; 120, output shaft; 130, first end cover; 140, first sealing ring; 150, second end cover; 151, temporary storage chamber; 160, second sealing ring; 161, conical sealing part; 162, pressing part; 170, pressing ring; 210, guide fan blade; 220, exhaust pipe; 230, drain pipe; 240, floating ring; 250, guide groove. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] like Figures 1 to 9 As shown in the figure, an embodiment of the present invention provides a sealing device for oil leakage maintenance of a reducer, which includes a housing 110, an output shaft 120, a first sealing component and a second sealing component.

[0036] The housing 110 contains a reduction gear filled with gear oil to lubricate it and reduce wear during operation. A power input shaft is mounted on the housing 110; one end of the shaft is connected to a motor, and the other end is connected to the reduction gear.

[0037] The output shaft 120 rotates through the housing 110. One end of the output shaft 120 inside the housing 110 is connected to the reduction gear. Under the action of the reduction gear, the power of the motor is transmitted to the output shaft 120. The rotational speed of the output shaft 120 is less than the rotational speed of the power input shaft, and the torque of the output shaft 120 is greater than the torque of the power input shaft.

[0038] The first sealing assembly is used to seal the gap between the output shaft 120 and the housing 110. Further, a bearing is provided between the housing 110 and the output shaft 120. The bearing is used to position the output shaft 120. The first sealing assembly is located outside the bearing. The first sealing assembly is installed when the output shaft 120 is not connected to the auxiliary equipment.

[0039] The second sealing assembly is used to further seal the gap between the output shaft 120 and the housing 110 when the first sealing assembly fails or its performance deteriorates. Specifically, after the output shaft 120 is connected to the auxiliary equipment, and when the first sealing assembly fails or its performance deteriorates, the second sealing assembly is installed between the output shaft 120 and the housing 110. At this time, gear oil may seep out from the gap between the housing 110 and the output shaft 120. The second sealing assembly can also transport the leaked gear oil back into the housing 110 to ensure that the amount of gear oil inside the housing 110 remains stable.

[0040] This invention discloses a sealing device for maintaining oil leakage in a speed reducer. A housing 110 is fixedly mounted on the ground or a frame. A reduction gear is installed inside the housing 110, and gear oil is filled inside the housing 110 to reduce wear on the reduction gear during operation. One end of an output shaft 120 is connected to the reduction gear inside the housing 110, and the other end of the output shaft 120 extends outside the housing 110. A first sealing assembly seals the gap between the output shaft 120 and the housing 110. As the output shaft 120 operates, the first sealing assembly may fail or its performance may deteriorate. In this case, the oil leakage in the output shaft may cause the seal to fail. A second sealing component is installed between the output shaft 120 and the housing 110. The second sealing component can be installed without disassembling or replacing the first sealing component. The second sealing component can further seal the gap between the output shaft 120 and the housing 110, and can also transport the gear oil that leaks when the first sealing component fails or its performance deteriorates back into the housing 110, ensuring that the gear oil inside the housing 110 remains submerged in the reduction gear. With the combined action of the first sealing component and the second sealing component, a long-term seal is achieved for the gap between the output shaft 120 and the housing 110.

[0041] In one embodiment, the first sealing assembly includes a first end cap 130 and a first sealing ring 140. The first end cap 130 is an integral ring structure, and is fitted onto the outside of the output shaft 120 when no auxiliary equipment is connected to the output shaft 120. A through hole is provided in the middle of the first end cap 130, and a mounting ring groove is provided on the side wall of the through hole, with the opening of the mounting ring groove facing the center of the through hole. The first sealing ring 140 is disposed in the mounting ring groove. The first sealing ring 140 can tightly abut against the outer wall of the output shaft 120, thereby sealing the gap between the mounting ring and the output shaft 120. When the output shaft 120 operates for a long time, wear will occur between the first sealing ring 140 and the outer surface of the output shaft 120, which will reduce the sealing performance of the first sealing ring 140 between the output shaft 120 and the housing 110. After the output shaft 120 has been running for a period of time, a second sealing component is installed between the output shaft 120 and the housing 110. The second sealing component and the first sealing component together complete the sealing between the housing 110 and the output shaft 120.

[0042] In one embodiment, the second sealing assembly includes a second end cap 150 and a second sealing ring 160. The second end cap 150 is fixed to the first end cap 130 and is spaced apart from the output shaft 120. The second sealing ring 160 is disposed on the second end cap 150 and abuts against the outer side wall of the output shaft 120. The second sealing ring 160 has a tapered sealing portion 161, which has a first end near the first end cap 130 and a second end away from the first end cap 130. The diameter of the first end is smaller than the diameter of the second end, and the second end is fixedly connected to the second end cap 150. By providing the tapered sealing portion 161 with the second sealing ring 160, when the output shaft 120 remains stationary, the tapered sealing portion 161 can effectively prevent gear oil from leaking into the external environment.

[0043] In one embodiment, after the auxiliary device is connected to the output shaft 120, to facilitate the installation of the second end cap 150 and the second sealing ring 160, both the second sealing ring 160 and the second end cap 150 are configured as separate structures. Specifically, both the second sealing ring 160 and the second end cap 150 are configured as multiple fan-shaped structures, wherein the number of separate parts of the second sealing ring 160 is the same as the number of separate parts of the second end cap 150, and the separated second sealing ring 160 is connected to the separated second end cap 150 in a one-to-one correspondence. It is easy to understand that each fan-shaped second sealing ring 160 is fixedly connected to a fan-shaped second end cap 150. When the sealing performance of the first sealing ring 140 between the housing 110 and the output shaft 120 decreases, the multiple fan-shaped second end caps 150 are fixed one by one to the first end cap 130. By configuring both the second sealing ring 160 and the second end cap 150 as separate structures, it is convenient to install them.

[0044] In one embodiment, after the auxiliary device is connected to the output shaft 120, both the second sealing ring 160 and the second end cap 150 are separate structures to facilitate the installation of the second end cap 150 and the second sealing ring 160. The second sealing ring 160 is provided with a clamping part 162, which is fixedly connected to the second end cap. Specifically, both the second sealing ring 160 and the second end cap 150 are configured as multiple sector-shaped structures, and each sector-shaped structure of the second sealing ring 160 includes a portion of the clamping part 162 and a portion of the conical sealing part 161. A clamping ring 170 is provided on the second end cap 150, which is used to fix the clamping part 162 of the second sealing ring 160 to the second end cap 150. By providing the clamping ring 170 and the clamping part 162, it is convenient to fix the conical sealing part 161 to the second end cap 150.

[0045] In one embodiment, to ensure that the second sealing ring 160 is connected to the second end cap 150 without being damaged, the second end cap 150 is provided with a mounting groove, and the clamping ring 170 can be installed in the mounting groove. The clamping ring 170 and the mounting groove are interference-fitted. By adjusting the size between the clamping ring 170 and the mounting groove, it is ensured that the clamping ring 170 is fixed in the mounting groove without using bolts.

[0046] In one embodiment, the conical sealing portion 161 of the second sealing ring 160 is deformable, and the first end of the conical sealing portion 161 has a pressing force against the outer surface of the output shaft 120. Even after the outer surface of the output shaft 120 is worn, the deformable conical sealing portion 161 still tightly abuts against the output shaft 120.

[0047] In one embodiment, the second sealing assembly further includes a guide fan blade 210, an exhaust pipe 220, and a drain pipe 230. The second end cap 150 has a temporary storage cavity 151 inside, with its opening facing the first end cap 130, allowing the temporary storage cavity 151 to communicate with a through hole. The exhaust pipe 220 connects the temporary storage cavity 151 to the external environment, and the drain pipe 230 connects the temporary storage cavity 151 to the interior of the housing 110. The exhaust pipe 220 is positioned above the drain pipe 230. Specifically, when the output shaft 120 is in a horizontal state, the exhaust pipe 220 is at the top of the temporary storage cavity 151, and the drain pipe 230 is at the bottom of the temporary storage cavity 151.

[0048] The guide fan blade 210 is sleeved on the output shaft 120 and is coaxially and fixedly connected to the output shaft 120. When the output shaft 120 rotates, the guide fan blade 210 can guide the airflow to push the conical seal 161 to deform. After the conical seal 161 deforms, it no longer contacts the outer wall of the output shaft 120. At this time, the gas enters the temporary storage chamber 151 through the gap between the conical seal 161 and the output shaft 120. A sealing component is provided in the temporary storage chamber 151. When the amount of gear oil entering the temporary storage chamber 151 reaches a first preset value, the exhaust pipe 220 is blocked. When the sealing component is in the state of blocking the exhaust pipe 220, as the gas further enters the temporary storage chamber 151, the pressure inside the temporary storage chamber 151 increases. Under the action of pressure, the gear oil inside the temporary storage chamber 151 is squeezed into the housing 110 through the drain pipe 230. Furthermore, a filter screen is installed inside the drain pipe 230. The filter screen can filter the gear oil entering the temporary storage chamber 151, reducing the amount of impurities in the gear oil entering the housing 110.

[0049] In one embodiment, the sealing element includes a floating ring 240, and a guide groove 250 is provided in the temporary storage cavity 151, which is vertically arranged. A slider is provided on the floating ring 240, and the slider is slidably disposed in the guide groove 250, so the floating ring 240 can move vertically in the temporary storage cavity 151. The density of the floating ring 240 is less than that of the gear oil. When the gear oil enters the inner chamber of the temporary storage cavity 151, the floating ring 240 can float on the surface of the gear oil. As the gear oil accumulates in the temporary storage cavity 151, the floating ring 240 can gradually move upward. When the amount of gear oil entering the temporary storage cavity 151 reaches a first preset value, the floating ring 240 slides to the state of sealing the exhaust pipe 220. As the airflow continues to enter the temporary storage cavity 151, the gear oil in the temporary storage cavity 151 is gradually transported into the housing 110 through the drain pipe 230.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device for oil leakage maintenance of a speed reducer, characterized in that, include: A housing, wherein a reduction gear is provided inside the housing and the housing is filled with gear oil; An output shaft rotatably passes through the housing, with one end of the output shaft inside the housing connected to the reduction gear; A first sealing assembly is used to seal the gap between the output shaft and the housing; The second sealing assembly is used to further seal the gap between the output shaft and the housing when the first sealing assembly fails or its performance deteriorates; the second sealing assembly is also able to re-supply the gear oil that has leaked when the first sealing assembly fails or its performance deteriorates to the interior of the housing. The first sealing assembly includes a first end cap and a first sealing ring. The first end cap is an integral circular ring structure with a through hole in the middle. The output shaft can pass through the through hole. The first sealing ring is disposed in the through hole and abuts against the outer surface of the output shaft. The second sealing assembly includes a second end cap and a second sealing ring. The second end cap can be fixed to the first end cap. The second sealing ring has a conical sealing portion, which has a first end close to the first end cap and a second end away from the first end cap. The diameter of the first end is smaller than the diameter of the second end, and the second end is fixedly connected to the second end cap. The conical sealing portion of the second sealing ring is deformable, and the first end of the conical sealing portion has a pressing force against the outer surface of the output shaft; The second sealing assembly further includes a guide fan blade, an exhaust pipe, and a drain pipe. The second end cap has a temporary storage cavity inside, which communicates with the through hole. The exhaust pipe connects the temporary storage cavity to the external environment, and the drain pipe connects the temporary storage cavity to the inside of the housing. The exhaust pipe is located above the drain pipe. The guide fan blade is sleeved on the output shaft. When the output shaft rotates, the guide fan blade can guide the airflow to push the conical seal to deform, allowing gas to enter the temporary storage cavity through the position of the conical seal. A sealing element is provided inside the temporary storage cavity to seal the exhaust pipe when the amount of gear oil entering the temporary storage cavity reaches a first preset value.

2. The sealing device for oil leakage maintenance of a reducer according to claim 1, characterized in that: Both the second sealing ring and the second end cap are split structures, wherein the number of split parts of the second sealing ring is the same as the number of split parts of the second end cap, and the split second sealing ring and the split second end cap are connected in a one-to-one correspondence.

3. A sealing device for oil leakage maintenance of a reducer according to claim 1, characterized in that: Both the second sealing ring and the second end cap are separate structures. The second sealing ring has a clamping part, which is fixedly connected to the second end cap. The second end cap is provided with a clamping ring, which is used to fix the clamping part of the second sealing ring to the second end cap.

4. A sealing device for maintaining oil leakage in a speed reducer according to claim 3, characterized in that: The second end cap is provided with a mounting groove, and the clamping ring can be installed in the mounting groove, with an interference fit between the clamping ring and the mounting groove.

5. A sealing device for oil leakage maintenance of a reducer according to claim 1, characterized in that: The sealing component includes a floating ring, the temporary storage cavity is provided with a guide groove, and the floating ring is provided with a slider, which is slidably disposed in the guide groove; the density of the floating ring is less than the density of the gear oil, and when the amount of gear oil entering the temporary storage cavity reaches a first preset value, the floating ring slides to the state of sealing the exhaust pipe.

6. A sealing device for oil leakage maintenance of a reducer according to claim 1, characterized in that: The drain pipe is equipped with a filter screen.

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