Leak-proof structure of large immersion type thin oil lubrication rotary equipment

Abstract

The utility model discloses a leakproof structure of large-scale immersion type thin oil lubrication rotary equipment, which comprises rotary equipment and a group of reduction gearboxes, cavities of the reduction gearboxes are communicated with an oil pool of the rotary equipment, and the reduction gearboxes comprise a group of parallel shaft gear pairs, a group of vertical shaft gear pairs and a sealing structure. According to the utility model, the dynamic sealing position of the immersion type thin oil lubrication rotary equipment is raised to be above the oil level surface, so that the lubricating oil is separated from the rotary sealing position. The design can effectively avoid the problems caused by lubricating oil leakage of large thin oil lubrication rotary equipment, and has the characteristics of good sealing effect and long service life.

Description

Technical Field

[0001] The utility model relates to a technology for preventing lubricating oil from leaking, in particular to a technology for preventing lubricating oil from leaking in large-scale immersed thin oil lubricated rotary equipment, specifically to an anti-leakage structure for large-scale immersed thin oil lubricated rotary equipment. Background Art

[0002] In large-scale immersed thin oil lubricated rotary equipment, the leakage of lubricating oil is the most common fault. The leakage of lubricating oil will not only cause environmental pollution, but also cause the gears, bearings and other parts in the transmission system to be poorly lubricated due to the loss of lubricating oil, and even cause the gears, bearings and other parts to wear out prematurely and become scrapped. Therefore, how to avoid leakage is a very important issue in the design of large-scale immersed thin oil lubricated rotary equipment.

[0003] The most common method to avoid leakage is sealing, which is to seal the gap between the joint surfaces, isolate or cut off the leakage channel to prevent leakage. Generally speaking, static sealing can achieve zero leakage, but for dynamic sealing, any relative displacement of the contact sealing surface will create conditions for the roughness of the joint surface to leak the medium, so it is particularly difficult or even impossible to achieve zero leakage.

[0004] According to whether the seal is in contact with the parts that are in relative motion, it can be divided into contact type and non-contact type. The sealing surfaces of contact type seals are close to each other, in contact, or even embedded to reduce or eliminate the gap to achieve sealing, so the sealing performance is good. The seals of non-contact seals do not contact directly, and a fixed assembly gap is reserved, so there is no mechanical friction and wear, the seals have a long service life, but the sealing performance is poor, and it is suitable for occasions with higher speeds.

[0005] The speed of large-scale immersed thin oil lubrication rotary equipment is not high. The oil seal has a small installation position and small axial size, which makes the machine compact; good sealing performance, has a certain adaptability to the vibration of the machine and the eccentricity of the main shaft; easy to disassemble, convenient maintenance, low price and other advantages, it is the most commonly used sealing form. In the free state, the inner diameter of the oil seal is smaller than the shaft diameter, that is, there is a certain amount of interference. After the oil seal is sealed on the shaft, the pressure of its cutting edge and the contraction force of the self-tightening spring produce a certain radial clamping force on the sealing shaft, blocking the leakage gap and achieving the purpose of sealing. Due to the friction between the oil seal cutting edge and the mating parts, after a certain period of use, it is inevitable that the oil seal will be worn by friction with the contact parts, resulting in leakage. Therefore, the oil seal needs to be replaced regularly. For large rotary equipment, it is difficult to replace the oil seal. For example, the dynamic seal at the output shaft of the drive system in the azimuth transmission system of a large air traffic control radar is an oil seal. Even if a double oil seal is used, leakage cannot be avoided. Once the lubricating oil leaks, it is necessary to stop the machine and replace the oil seal, which seriously affects the reliability of the equipment.

[0006] Therefore, how to avoid the leakage of lubricating oil in large-scale immersed thin oil lubricated rotary equipment with high requirements on reliability and life is an urgent problem to be solved by technical personnel in this field.

[0007] like Figure 1 As shown, the existing large-scale thin oil lubricated rotary equipment includes an input shaft and a rotary equipment. The rotary equipment 1 includes a toothed slewing bearing and a small gear meshing therewith. The input shaft 3 and the rotary equipment are driven by a gear mechanism 2. The gear mechanism 2 is half immersed in the lubricating oil, wherein the straight line C represents the oil level. The input shaft 3 is generally at the bottom of the oil pool. There is a dynamic seal 4 between the input shaft 3 and the housing. The dynamic seal is also at the bottom of the oil pool. Once the oil seal is damaged, the lubricating oil will inevitably flow out along the input shaft. In situations where it is difficult to replace the oil seal, a technology to avoid the leakage of lubricating oil in large-scale immersed thin oil lubricated rotary equipment is needed to ensure that the designed thin oil lubricated transmission system achieves the purpose of no leakage. Summary of the invention

[0008] The utility model aims at the deficiencies of the prior art and provides a leakage-proof structure for large-scale immersed thin oil lubricated rotary equipment. The structure has simple design and good sealing effect.

[0009] The specific technical solution of the utility model is as follows:

[0010] The anti-leakage structure of a large-scale immersed thin oil lubricated rotary equipment comprises a rotary equipment and a group of reduction boxes, wherein the cavity of the reduction box is communicated with the oil pool of the rotary equipment, and the reduction box comprises a group of parallel shaft gear pairs, a group of vertical shaft gear pairs, a group of labyrinth oil blocking rings and a group of rotating oil seals;

[0011] The two shafts of the parallel shaft gear pair are an output shaft and an intermediate shaft which are both vertically arranged, and the parallel shaft gear pair is immersed in lubricating oil; the output shaft is connected to the rotary device through a gear mechanism;

[0012] The two shafts of the vertical shaft gear pair are an intermediate shaft and a horizontally arranged input shaft, the vertical shaft gear pair is half immersed in lubricating oil, and the input shaft is located above the oil level;

[0013] The labyrinth oil blocker includes two oil blockers, the inner oil blocker is installed on the input shaft, and the outer oil blocker is installed on the housing. The oil level is not higher than the height of the joint between the inner and outer oil blockers; the rotary oil seal is located above the oil level.

[0014] The utility model is further designed in that a second parallel axis gear pair is also provided, and the second parallel axis gear pair is arranged between the parallel axis gear pair and the vertical axis gear pair.

[0015] A further design is that a second parallel axis gear pair is provided, and the second parallel axis gear pair is provided between the vertical axis gear pair and the input shaft.

[0016] A further design is that the rotary oil seal adopts a rubber part, a metal frame is arranged inside the rubber part, the outer ring of the rubber part is installed on the housing, and the cutting edge of the innermost ring is against the input shaft seal.

[0017] The rotary oil seal is a standard part. The outer ring of the rubber part is installed on the housing. The edge of the innermost ring is against the input shaft to prevent external dust from entering the sealing structure. At the same time, if the oil overflows from the labyrinth oil blocker, the rotary oil seal also acts as a safety seal.

[0018] A further design is that the gear mechanism between the rotary device and the output shaft is half immersed in lubricating oil.

[0019] A further design is that static seals are used at the joints between the reduction box housing and the rotary equipment oil pool, and at the joints between each reduction box housing.

[0020] A further design is that the static seal is an O-ring.

[0021] A further design is that O-rings are used between the labyrinth oil blocking ring and the housing and the input shaft.

[0022] A further design is that the upper end bearing of the intermediate shaft is lubricated with grease, and an oil cup is arranged on the bearing cover; the lower end bearing of the intermediate shaft and the output shaft bearing are both immersed in lubricating oil.

[0023] Compared with the prior art, the utility model has the following technical effects:

[0024] The utility model provides a leakage prevention structure for large-scale immersed thin oil lubricated rotary equipment, which separates the lubricating oil from the rotating seal by raising the dynamic seal position of the immersed thin oil lubricated rotary equipment above the oil level. The design can effectively avoid the problems caused by the leakage of lubricating oil in large-scale thin oil lubricated rotary equipment, and has the characteristics of good sealing effect and long service life.

[0025] In order to avoid the leakage of lubricating oil in large-scale immersed thin oil lubricated rotary equipment, the utility model adopts a reduction box, which mainly includes one group (or more groups) of parallel shaft gear pairs, one group of vertical shaft gear pairs and one group of labyrinth oil blocking rings and oil seals. The reduction box transfers the position of the dynamic seal to a position where the lubricating oil cannot reach on the basis of realizing the deceleration function, thereby avoiding the leakage of the lubricating oil in the equipment, making the equipment simple in structure and high in reliability.

[0026] In addition to achieving the purpose of speed reduction through the structure of the gear pair inside the reduction box, the utility model has the function of the parallel axis gear pair to lead the dynamic seal to the outside of the oil pool of the rotating equipment; the function of the vertical axis gear pair is to change the dynamic seal from the vertical direction to the horizontal direction and raise the position of the dynamic seal to above the oil level.

[0027] In the utility model, the function of the labyrinth oil blocking ring is to prevent the lubricating oil from being thrown to the dynamic seal position due to the rotation of the shaft, so that the lubricating oil and the rotating oil seal are completely isolated, thereby achieving the purpose of preventing the leakage of the lubricating oil; the function of the rotating oil seal is to prevent foreign impurities from entering the cavity through the gap at the dynamic seal. The utility model achieves the purpose of preventing the leakage of the lubricating oil by isolating the lubricating oil from the dynamic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the lubricating oil seal structure of an existing large-scale thin oil lubricated rotary equipment;

[0029] Figure 1 In the figure, 1-rotating device; 2-gear mechanism; 3-input shaft; 4-dynamic seal; the straight line where C is located represents the oil level;

[0030] Figure 2 This is a schematic diagram of the anti-leakage structure of a large-scale immersed thin oil lubricated rotary equipment;

[0031] Figure 3 It is a partial schematic diagram of the anti-leakage structure of a large-scale immersed thin oil lubricated rotary equipment;

[0032] Figure 4 for Figure 3 A partial enlarged view of the M in the middle;

[0033] Figure 2-4 In the figure: 1-rotating device; 2-gear mechanism; 3-output shaft; 4-intermediate shaft; 5-input shaft; 6-labyrinth oil blocker; 61-inner oil blocker; 62-outer oil blocker; 7-rotating oil seal; 8-first gear; 9-second gear; 10-third gear; 11-fourth gear; A represents parallel axis gear pair; B represents vertical axis gear pair; the straight line where C is located represents the oil level; D represents the reduction box. DETAILED DESCRIPTION

[0034] The following describes the specific implementation of the present invention in detail with reference to the accompanying drawings: Embodiment 1:

[0035] like Figure 2As shown, the anti-leakage structure of a large-scale immersed thin oil lubricated rotary equipment includes a rotary equipment 1 and a set of reduction gearboxes D. The rotary equipment includes a toothed slewing bearing and a small gear meshing therewith. The cavity of the reduction gearbox is connected to the oil pool of the rotary equipment. The reduction gearbox D includes a set of parallel axis gear pairs A, a set of vertical axis gear pairs B, a set of labyrinth oil blocking rings and a set of rotating oil seals. The straight line where C is located represents the oil level surface.

[0036] The two shafts of the parallel shaft gear pair A are an output shaft 3 and an intermediate shaft 4 which are both vertically arranged. The parallel shaft gear pair is immersed in lubricating oil. The output shaft 3 is connected to the rotary device 1 through a gear mechanism.

[0037] The two shafts of the vertical axis gear pair B are an intermediate shaft 4 and a horizontally arranged input shaft 5. The vertical axis gear pair is half immersed in lubricating oil, and the input shaft 5 is located above the oil level.

[0038] The labyrinth oil blocker 6 includes two oil blockers, the inner oil blocker 61 is installed on the input shaft, and the outer oil blocker 62 is installed on the housing. The oil level is not higher than the height of the joint between the inner and outer oil blockers; the rotary oil seal 7 is located above the oil level.

[0039] The rotary oil seal 7 is made of a rubber piece with a metal frame arranged inside. The outer ring of the rubber piece is mounted on the housing, and the cutting edge of the innermost ring is against the input shaft seal.

[0040] The rotary oil seal 7 is a standard part. The outer ring of the rubber part is installed on the housing. The edge of the innermost ring is against the input shaft to prevent external dust from entering the sealing structure. At the same time, if the oil overflows the labyrinth oil blocker, the rotary oil seal also plays a safety seal role.

[0041] The gear mechanism between the rotary device 1 and the output shaft 3 is half immersed in lubricating oil.

[0042] Static seals are used at the joints between the reduction box housing and the rotary equipment oil pool, as well as at the joints of each reduction box housing. Embodiment 2:

[0043] like Figure 2-Figure 4 As shown, the anti-leakage structure of the large-scale immersed thin oil lubricated rotary equipment of the utility model adds a group of reduction box D at the lower part of the oil pool of the existing large-scale thin oil lubricated rotary equipment. The reduction box D mainly includes a group (or multiple groups) of parallel shaft gear pairs A, a group of vertical shaft gear pairs B and a group of labyrinth oil blocking rings 6 and a rotating oil seal 7. The straight line where C is located represents the oil level surface.

[0044] The output gear of the reduction box replaces the final drive gear of the original rotary equipment. The output shaft D of the reduction box is coaxial with the first gear 8 of the parallel axis gear pair inside the reduction box, the second gear 9 of the parallel axis gear pair is coaxial with the third gear 10 of the vertical axis gear pair, and the fourth gear 11 of the vertical gear pair is coaxial with the input shaft 5 of the reduction box. The power drive device is connected to the input shaft 5 of the reduction box, and drives the rotary equipment to rotate through the output gear after the two-stage gear transmission of the reduction box.

[0045] According to the required reduction ratio, one or more sets of parallel shaft gear pairs can be added between the parallel shaft gear pair A and the vertical shaft gear pair B. In this method, it should be noted that the speed of the parallel shaft gear pair should not be too high, because the gears there are immersed in lubricating oil, and it is necessary to prevent excessive power loss caused by oil stirring. It is also possible to add one or more levels of parallel shaft or coaxial transmission mechanisms between the vertical shaft gear pair and the input shaft. In this method, it is necessary to pay attention to the relationship between the position of the dynamic seal of the input shaft and the oil level surface, and the oil level surface must be ensured to be below the dynamic seal joint.

[0046] Lubrication description of each component of this technology: the final gear mechanism that cooperates with the rotating equipment is half immersed in lubricating oil. When the equipment rotates, the final gear pair rotates and meshes, and the lubricating oil will make the entire tooth surface in a lubricating oil lubricated state; the cavity of the reduction box is connected to the oil pool of the rotating equipment, and the parallel axis gear pairs inside the reduction box are all immersed in lubricating oil; the vertical axis gear pair realizes splash lubrication of the gears through gear rotation; the bearings on the input shaft are all splash lubricated by rotation; the upper end bearing of the intermediate shaft is greased, and an oil cup is set on the bearing cover for regular maintenance; the lower end bearing of the intermediate shaft and the output shaft bearing are immersed in lubricating oil. Therefore, the final gear pair of the rotating equipment and the gear pair and bearings inside the reduction box will be well lubricated.

[0047] Sealing description of each component of this technology: The joints between the reducer housing and the rotary equipment oil pool, and the joints of each housing of the reducer are all static seals, which are sealed with O-rings. In the structure of the rotary equipment and the reducer, only the input shaft of the reducer is a dynamic seal, but the oil level is set below the dynamic seal gap, and the lubricating oil will not leak in the static state. Figure 3 , a labyrinth oil blocker is set at the dynamic seal, the inner oil blocker is installed on the input shaft, and the outer oil blocker is installed on the housing. The two oil blockers are sealed with O-rings on the shaft and the housing respectively. The position relationship between the inner and outer oil blocker joints and the oil level surface C can be seen in Figure 4 When the input shaft rotates, due to the centrifugal force, the lubricating oil is thrown toward the housing along the inner oil blocker. Due to the isolation of the outer oil blocker, the lubricating oil cannot reach the dynamic seal gap, thus ensuring that the lubricating oil will not leak. The outermost rotating oil seal separates the reduction box cavity from the outside world, preventing external impurities and dust from entering the reduction box through the gap.

[0048] The lubricating oil in the rotary equipment will not leak through the reduction box. Since the labyrinth oil blocker is non-contact, it will not produce friction and wear, and will not be damaged during normal use, thus achieving the purpose of never leaking. This design method enables the reduction box to not only achieve the function of deceleration, but also take into account the function of preventing lubricating oil leakage, with a compact structure; in terms of production and manufacturing, they are all standard parts with low cost.

Claims

1. A leakage-proof structure for large-scale immersed thin oil lubricated rotary equipment, comprising a rotary equipment, characterized in that: It also includes a reduction box, the cavity of which is in communication with the oil pool of the rotary device, and the reduction box includes a set of parallel axis gear pairs, a set of vertical axis gear pairs, a set of labyrinth oil blocking rings and a set of rotary oil seals; The two shafts of the parallel shaft gear pair are an output shaft and an intermediate shaft which are both vertically arranged, and the parallel shaft gear pair is immersed in lubricating oil; the output shaft is connected to the rotary device through a gear mechanism; The two shafts of the vertical shaft gear pair are an intermediate shaft and a horizontally arranged input shaft, the vertical shaft gear pair is half immersed in lubricating oil, and the input shaft is located above the oil level; The labyrinth oil blocker includes two oil blockers, the inner oil blocker is installed on the input shaft, and the outer oil blocker is installed on the housing. The oil level is not higher than the height of the joint between the inner and outer oil blockers; the rotary oil seal is located above the oil level.

2. The anti-leakage structure of the large-scale immersed thin oil lubrication rotary equipment according to claim 1 is characterized in that: The parallel shaft gear pairs are arranged in two or more groups.

3. The anti-leakage structure of large-scale immersed thin oil lubrication rotary equipment according to claim 2 is characterized in that: A second parallel axis gear pair is also provided, and the second parallel axis gear pair is provided between the parallel axis gear pair and the vertical axis gear pair.

4. The anti-leakage structure of large-scale immersed thin oil lubrication rotary equipment according to claim 2 is characterized in that: A second parallel axis gear pair is also provided, and the second parallel axis gear pair is provided between the vertical axis gear pair and the input shaft.

5. The anti-leakage structure of large-scale immersed thin oil lubricated rotary equipment according to claim 1, 2, 3 or 4, characterized in that: The rotary oil seal adopts a rubber part with a metal frame inside. The outer ring of the rubber part is installed on the housing, and the cutting edge of the innermost ring is against the input shaft seal.

6. The anti-leakage structure of large-scale immersed thin oil lubricated rotary equipment according to claim 1, 2, 3 or 4, characterized in that: The gear mechanism between the rotating device and the output shaft is half immersed in lubricating oil.

7. The anti-leakage structure of large-scale immersed thin oil lubricated rotary equipment according to claim 1, 2, 3 or 4, characterized in that: Static seals are used at the joints between the reduction box housing and the rotary equipment oil pool, as well as at the joints of each reduction box housing.

8. The anti-leakage structure of large-scale immersed thin oil lubrication rotary equipment according to claim 7 is characterized in that: The static seal adopts an O-ring.

9. The anti-leakage structure of large-scale immersed thin oil lubrication rotary equipment according to claim 1 is characterized in that: O-rings are used between the labyrinth oil blocking ring and the housing and the input shaft.

10. The anti-leakage structure of large-scale immersed thin oil lubrication rotary equipment according to claim 1, characterized in that: The lower end bearing of the intermediate shaft and the output shaft bearing are immersed in lubricating oil.

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