Mechanical sealing structure of speed reducer
Through the static ring seat and dynamic ring sleeve structure, combined with the adjustment seat, adjustment bolt, stop-retard nut and airbag design, the problem of adjusting the spindle gap of the reducer is solved, the sealing effect and stability are improved, and oil loss and internal damage are reduced.
Patent Information
- Application Number
- CN202422514820.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-17
AI Technical Summary
During the maintenance of existing reducers, the spindle clearance adjustment is difficult to adapt, resulting in abnormal noise, oil leakage and frequent replacement, affecting production efficiency.
The static ring seat and movable ring sleeve structure are adopted, combined with the adjustment seat, adjustment bolt, stop-retard nut and airbag design, to achieve static sealing and clearance adjustment, adjust the gap through thread compression, and enhance the sealing effect with the airbag and L protrusion.
It realizes flexible adjustment and stable sealing of the reducer spindle clearance, reduces oil loss, avoids damage to internal parts due to excessive pressure, and improves equipment operation stability.
Smart Images
Figure CN223152724U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of speed reducers, and more specifically, to a mechanical seal structure of a speed reducer. Background Art
[0002] The rotary disc aerator is an important device in the sewage treatment plant. The long-term friction between the operating main shaft of the speed reducer of the rotary disc aerator and the oil seal will cause grooves on the main shaft, resulting in oil leakage, abnormal noise, wear of bearings and gears, etc. Even after replacing the new oil seal, it can't last long, and the main shaft needs to be replaced. After the speed reducer bearings operate for a long time, wear occurs, resulting in an increase in the installation gap. The equipment runs with a runout, which in turn causes the gears to break teeth. Currently, the adjustment of the main shaft gap of the speed reducer is rather troublesome and the effect is not ideal. (Currently, the adjustment of the main shaft requires draining the oil from the speed reducer, damaging the blank cover, and adjusting the gap by adjusting the gasket. Many specifications of gaskets need to be equipped and they are often incomplete. Because the thinnest gasket commonly made on the market also has a thickness of 0.1 mm, while the clearance of the tapered roller bearing should usually be adjusted within 0.02 mm. As a result, the main shaft gap usually exceeds the standard after installation. Its gap is difficult to adapt. If the gap exceeds the standard, it will cause abnormal noise and oil leakage, and frequent replacement will also affect production. In view of this, we propose a mechanical seal structure for a speed reducer. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies of the prior art, meet the actual needs, and provide a mechanical seal structure for a speed reducer to solve the technical problem that it is difficult to adapt the gap between components during the maintenance of the current speed reducer.
[0004] To solve the above technical problems, the utility model provides the following technical solution: A mechanical seal structure for a speed reducer, including a cushion block, the cushion block is attached to the outer ring of the speed reducer bearing, one side of the cushion block is provided with an adjusting seat, a screw thread is provided on the outer periphery of the adjusting seat, the adjusting seat is fixed to the tail of the speed reducer main shaft through a bolt, an adjusting bolt for pressing the cushion block is threadedly connected to the center of the adjusting seat, a check nut is arranged on the outer thread of the adjusting bolt, an outer connecting shell is arranged on the outer periphery of the adjusting seat, the outer connecting shell is connected to the tail of the speed reducer main shaft, an L-shaped protrusion for buckling the adjusting seat is integrally formed on one side of the outer connecting shell, an airtight structure is arranged inside the L-shaped protrusion, and the speed reducer oil seal is realized through a stationary ring seat and a moving ring sleeve.
[0005] Preferably, an installation groove is provided on the outer periphery of the cushion block, a sealing member is arranged inside the installation groove, and an annular cavity is provided on the outer side of the adjusting seat.
[0006] Preferably, the upper half of the check nut is a two-protrusion clamp structure, a fixed bolt is connected between the two clamps, an internal thread port adapted to the adjusting bolt is arranged between the two clamps, and the lower half of the check nut is bolt-fixed to the adjusting seat.
[0007] Preferably, the airtight structure includes a first airbag disposed between the cushion block and the adjusting seat. The first airbag has an annular cross-section. A second airbag is further disposed outside the first airbag on the outer side of the annular cavity. A ventilation pipeline is provided between the second airbag and the first airbag. A ring plate is provided on one side of the second airbag.
[0008] Preferably, the ring plate is of an annular structure. The outer side of the ring plate is a slope with an angle. A plug rod is connected to one side of the ring plate. The plug rod is tenoned and inserted into the annular cavity. A sealing gasket adapted to the annular cavity is provided between the outer circumferences of the plug rods.
[0009] Preferably, the stationary ring seat is fixed to the original oil seal position of the reducer by bolts, and the moving ring sleeve is installed on the main shaft of the reducer.
[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0011] 1. Through the stationary ring seat and moving ring sleeve structures of the present utility model, static sealing can be achieved to prevent oil from leaking out of the outer circle of the stationary ring seat. Then, through the cooperation of the adjusting seat fixed to the tail of the main shaft, the cushion block and the adjusting bolt, and by pressing the adjusting component with threads, any clearance can be adjusted to achieve the clearance adjustment effect, solving the problem that it is difficult to adapt the clearance to the components during the maintenance of the reducer.
[0012] 2. The present utility model also through the communication design of the two airbags and the limiting cooperation of the L protrusion, the ring plate and the plug rod, can further increase the pressing force. At the same time, when there is a problem with the pressing, the oil can be blocked to achieve sealing and reduce the loss of oil. Then, through the connection between the anti-back-off nut column and the adjusting bolt, the pressing stability of the cushion block can be strengthened. At the same time, with the design of the two clamping blocks of the anti-back-off nut, when the internal pressure is too high, the clamping blocks will shift and disengage, canceling the restraint on the adjusting bolt to avoid excessive internal pressure and damaging the internal parts of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic structural diagram of the present utility model;
[0014] Figure 2 is a schematic semi-sectional structural diagram of the present utility model;
[0015] Figure 3 is the Figure 2 enlarged view of the structure at A in the present utility model;
[0016] Figure 4 is a schematic diagram of the split structure of the ring plate of the present utility model;
[0017] Figure 5 is a schematic structural diagram of the anti-back-off nut of the present utility model;
[0018] Figure 6 This is a schematic structural diagram of the stationary ring seat and the rotating ring sleeve of the present utility model.
[0019] Explanation of the reference numerals in the figure: 1, spacer block; 2, adjusting seat; 3, adjusting bolt; 4, check nut; 5, external housing; 6, L-shaped protrusion; 7, airtight structure; 8, stationary ring seat; 9, rotating ring sleeve; 10, annular cavity;
[0020] 701, first airbag; 702, second airbag; 703, annular plate; 704, insertion rod; 705, gasket. Specific embodiments
[0021] As Figures 1 to 6 shown, a mechanical seal structure of a speed reducer related to the present utility model includes a stationary ring seat 8 and a rotating ring sleeve 9 for replacing the oil seal. The stationary ring seat 8 has two functions. The first is to install the stationary ring at the original position of the skeleton oil seal, and the second is to set a static seal to prevent oil from leaking out of the outer ring of the stationary ring seat 8. The original main shaft does not have the function of installing the rotating ring. The rotating ring sleeve 9 is manufactured and installed on the original main shaft to fix the rotating ring. This is the component setting in the end area of the main shaft;
[0022] An adjusting seat 2 is provided at the tail of the main shaft of the speed reducer. A screw thread is provided on the outer periphery of the adjusting seat 2. The adjusting seat 2 is fixed to the tail of the main shaft of the speed reducer through a bolt. A spacer block 1 is provided on one side of the adjusting seat 2. The spacer block 1 is in contact with the outer ring of the speed reducer bearing. An adjusting bolt 3 that presses against the spacer block 1 is threadedly connected to the center of the adjusting seat 2. The clearance adjustment is adjusted by pressing the adjusting component through the thread, so that any clearance can be adjusted. For example, for a clearance of 0.1 mm, the thread can be tightened by about 18°. In actual application, generally, the clearance is adjusted to the minimum (until the thread cannot be tightened anymore), and then the thread is loosened by about 3 - 5° to produce a better clearance. This method does not require detecting the original installation clearance. First, directly zero the clearance, and then release a little clearance to meet the assembly requirements;
[0023] Among them, the adjusting seat 2 is installed on the speed reducer seat. It bears all the axial forces during the clearance adjustment and use process, and the strength must be sufficient to withstand the axial thrust generated during the operation of the speed reducer;
[0024] The spacer block 1 is in direct contact with the outer ring of the bearing and is pressed against the outer ring of the bearing by the pressure of the external nut. It is required to have good parallelism and perpendicularity so that the clearance is not unidirectional during the adjustment process. The parts need to consider the seal design, and a seal installation groove needs to be provided at the outer circle position. The adjusting seat 2 can be directly pressed against the spacer block 1 without being connected to it, or can be fixed by a rotating connection method.
[0025] In an embodiment of the present utility model, due to the large load of the speed reducer, in order to improve stability and strengthen anti-retreat, a check nut 4 is arranged on the outer periphery of the thread of the adjusting bolt 3. The upper half of the check nut 4 is of a structure with two protruding chucks. A fixed bolt is connected between the two chucks. An internal thread port adapted to the adjusting bolt 3 is arranged between the two chucks. The lower half of the check nut 4 is bolt-fixed to the adjusting seat 2. With the design of the two chucks, when the internal pressure is too high, the chucks will shift and separate, canceling the restraint on the adjusting bolt 3 and avoiding damage to the internal parts of the speed reducer due to excessive internal pressure.
[0026] Further, an annular ring cavity 10 is formed on the outer side of the adjusting seat 2. An external housing 5 is arranged on the outer periphery of the adjusting seat 2. The external housing 5 is connected to the tail of the main shaft of the speed reducer. An L-shaped protrusion 6 for buckling the adjusting seat 2 is integrally formed on one side of the external housing 5. An airtight structure 7 is arranged inside the L-shaped protrusion 6. The airtight structure 7 includes a first airbag 701 arranged between the cushion block 1 and the adjusting seat 2. The first airbag 701 has an annular cross-section. A second airbag 702 is further arranged outside the ring cavity 10 outside the first airbag 701. A ventilation pipeline is arranged between the second airbag 702 and the first airbag 701. A ring plate 703 is arranged on one side of the second airbag 702. The ring plate 703 is of an annular structure. The outer side of the ring plate 703 is a slope with an angle. A plug rod 704 is connected to one side of the ring plate 703. The plug rod 704 is tenon-and-mortise fitted with the ring cavity 10. A sealing gasket 705 adapted to the ring cavity 10 is arranged between the outer peripheries of the plug rods 704. One side of the L-shaped protrusion 6 contacts the adjusting seat 2 to generate a pressing force, further improving stability. It should be noted that the first airbag 701 is in a fully inflated state and is fixed to the adjusting seat 2 on one side. The second airbag 702 is in a nearly inflated state and fills the internal space, so that the second airbag 702 presses against the slope of the ring plate 703. Cooperating with the sealing gasket 705, sealing can be achieved. When leakage occurs, oil fluid loss and ground pollution can be reduced.
[0027] Working principle: This embodiment provides a mechanical seal structure for a speed reducer. When in use, the static ring seat 8 and the dynamic ring sleeve 9 are installed at the original oil seal position of the speed reducer, and then the adjusting seat 2 is bolt-fixed to the tail of the main shaft of the speed reducer. When the clearance needs to be adjusted, the adjusting bolt 3 is rotated. When the cushion block 1 is pressed until it is tight and immovable, then it is loosened reversely by about 3 - 5°, and then the parts can be installed.
[0028] When the load of the speed reducer is large, under the action of the check nut 4, a check force can be generated on the adjusting bolt 3. At the same time, the L-shaped protrusion 6 of the external housing 5 can further restrain the adjusting seat 2 to enhance stability. At the same time, with the cooperation of the airbag, when oil fluid leakage occurs, the gap between the adjusting seat 2 and the external housing 5 can be strengthened and sealed.
[0029] The embodiments disclosed in the present utility model are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and changes. As long as they do not depart from the spirit of the present utility model, they are within the protection scope of the present utility model.
Claims
1. A mechanical seal structure for a speed reducer, characterized in that, It includes a spacer block (1) which fits against the outer ring of the reducer bearing. On one side of the spacer block (1), there is an adjusting seat (2). The outer periphery of the adjusting seat (2) is provided with a screw thread. The adjusting seat (2) is fixed to the tail of the reducer main shaft by bolts. An adjusting bolt (3) that presses against the spacer block (1) is threadedly connected to the center of the adjusting seat (2). A locking nut (4) is arranged on the outer thread of the adjusting bolt (3). An outer housing (5) is arranged on the outer periphery of the adjusting seat (2). The outer housing (5) is connected to the tail of the reducer main shaft. An L-shaped projection (6) that snaps onto the adjusting seat (2) is integrally formed on one side of the outer housing (5). An airtight structure (7) is arranged inside the L-shaped projection (6). The reducer oil seal is realized through a stationary ring seat (8) and a rotating ring sleeve (9).
2. The mechanical seal structure of a speed reducer according to claim 1, wherein, An installation groove is provided on the outer periphery of the spacer block (1), and a seal is arranged inside the installation groove. An annular cavity (10) is provided on the outer side of the adjusting seat (2).
3. The mechanical seal structure of a speed reducer according to claim 2, characterized in that, The upper half of the locking nut (4) is a two-protruding chuck structure. A fixed bolt is connected between the two chucks. An internal thread port adapted to the adjusting bolt (3) is arranged between the two chucks. The lower half of the locking nut (4) is bolt-fixed to the adjusting seat (2).
4. A mechanical seal structure of a speed reducer according to claim 3, characterized in that, The airtight structure (7) includes a first airbag (701) arranged between the spacer block (1) and the adjusting seat (2). The first airbag (701) has an annular cross-section. A second airbag (702) is arranged outside the annular cavity (10) outside the first airbag (701). A ventilation pipeline is arranged between the second airbag (702) and the first airbag (701). A ring plate (703) is arranged on one side of the second airbag (702).
5. A mechanical seal structure of a speed reducer according to claim 4, characterized in that, The ring plate (703) is an annular structure. The outer side of the ring plate (703) is a sloped surface with an angle. A plug rod (704) is connected to one side of the ring plate (703). The plug rod (704) is tenon-and-mortise fitted with the annular cavity (10). A sealing gasket (705) adapted to the annular cavity (10) is arranged between the outer peripheries of the plug rods (704).
6. The mechanical seal structure of a speed reducer according to claim 5, characterized in that, The stationary ring seat (8) is fixed to the original oil seal position of the reducer by bolts. The rotating ring sleeve (9) is installed on the main shaft of the reducer.