Bearing box labyrinth oil seal and bearing assembly

Abstract

The utility model relates to the technical field of oil seals, in particular to a labyrinth oil seal of a bearing box and a bearing assembly.The labyrinth oil seal comprises an oil seal body, the oil seal body comprises a first matching part and a second matching part which are arranged in the axial direction, and a main body notch used for oil drainage is formed in the outer wall of the first matching part; a plurality of sealing rings are arranged on the inner wall of the second matching part, and a labyrinth cavity is formed between every two adjacent sealing rings. The first matching part and the second matching part which are matched with the transmission shaft are arranged, the first matching part is located on the side close to the bearing, and the first matching part is matched with the shaft shoulder in the assembling state, so that primary blocking is achieved, and the probability that lubricating oil enters the labyrinth cavity is reduced; the first matching part is arranged on the sealing ring, the main body notch is formed in the first matching part, a small amount of lubricating oil entering the first matching part is thrown into the bearing box in the normal direction of the rotating direction, and the oil drainage groove formed in the sealing ring is further communicated with the main body notch and used for discharging a small amount of lubricating oil entering the oil cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a bearing box labyrinth oil seal and a bearing assembly. Background Art

[0002] The oil seal in the bearing housing plays a crucial role in the operation of a centrifugal pump, and its performance is directly related to the reliability, stability, and service life of the equipment. An oil seal is a mechanical component used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to liquid substances in general). It isolates the transmission components that require lubrication from the output components, preventing lubricant leakage. Conventional centrifugal pump bearing housing oil seals generally have a relatively simple structure and suffer from numerous drawbacks. Firstly, conventional oil seals struggle to effectively control the lubricant's entry into the critical sealing area. Due to the lack of a specialized envelope structure design, lubricant easily floods into the seal's working chamber. This not only wastes lubricant but also risks seal failure due to excessive oil accumulation, further impacting the normal operation of the centrifugal pump. Secondly, conventional oil seals lack the ability to effectively control the flow rate of lubricant, making it impossible to effectively slow the flow of lubricant. This makes it easy for lubricant to break through the seal's defenses when the shaft rotates at high speeds, causing leakage. Therefore, the present invention develops a bearing housing labyrinth oil seal and bearing assembly to address these issues. Utility Model Content

[0003] The utility model aims to provide a bearing box labyrinth oil seal and a bearing assembly to solve the problem that the oil seal structure in the prior art is prone to failure and leakage.

[0004] The technical solution of the present utility model is: a bearing box labyrinth oil seal, including an oil seal body, the oil seal body including a first matching part and a second matching part arranged along the axial direction, a main body groove for oil leakage is opened on the outer wall of the first matching part, and a plurality of sealing rings are provided on the inner wall of the second matching part, and a labyrinth cavity is formed between adjacent sealing rings.

[0005] Preferably, the first matching portion is trumpet-shaped, and the size of the opening gradually increases from the side close to the second matching portion to the side away from the second matching portion.

[0006] Preferably, the axial direction from the first matching portion to the second matching portion is set as a first positive direction;

[0007] The labyrinth cavity includes at least one oil cavity distributed along the first positive direction, and an oil drain groove is provided on the sealing ring of each oil cavity biased toward the first matching part; the oil drain groove and the main body notch are arranged on the same circumferential side direction of the oil seal body.

[0008] Preferably, the axial direction from the second matching portion to the first matching portion is set as a first reverse direction;

[0009] The labyrinth cavity further comprises at least one water cavity distributed along the first reverse direction, and a water drain groove is provided on the sealing ring of each water cavity on the side away from the first matching portion.

[0010] Preferably, the sealing ring separating the oil chamber and the water chamber is constructed as a separation ring, and the separation ring is a completely closed annular structure.

[0011] Preferably, a connecting portion is further provided on the outer wall of the second matching portion; the connecting portion is annular and is fixedly connected to or integrally formed with the second matching portion; and assembly holes are distributed on the connecting portion.

[0012] The utility model also discloses a bearing assembly, comprising:

[0013] bearing housing;

[0014] A transmission shaft is arranged through the bearing box;

[0015] A bearing is installed between the bearing box and the transmission shaft, wherein the inner ring of the bearing is fixedly matched with the transmission shaft, and the outer ring of the bearing is fixedly matched with the bearing box;

[0016] And an oil seal body, which is directly or indirectly fixedly connected to the bearing box, the oil seal body includes a first matching part and a second matching part arranged along the axial direction, the outer wall of the first matching part is provided with a main groove for oil leakage, and the inner wall of the second matching part is provided with multiple sealing rings, and a labyrinth cavity is formed between adjacent sealing rings.

[0017] Preferably, the transmission shaft has a shaft shoulder, and the inner ring of the bearing abuts against the shaft shoulder; the first matching portion is trumpet-shaped and matches with the shaft shoulder.

[0018] Preferably, the shoulder is accommodated in the first fitting portion, and the axial thickness of the shoulder is smaller than the axial length of the first fitting portion, so that a gap space is formed in the first fitting portion, and the gap space is connected to the main body notch.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) Set up the first matching part and the second matching part matched with the transmission shaft, and the first matching part is at the side close to the bearing, the first matching part is matched with the shaft shoulder in the assembly state, and the first matching part plays a one-stage barrier and reduces the probability of lubricating oil entering the labyrinth cavity; and the main slot is formed on the first matching part, a small amount of lubricating oil entering the first matching part is thrown into the bearing box along the normal direction of the rotation direction, and the oil discharge groove formed on the sealing ring is also communicated with the main slot and is used for discharging a small amount of lubricating oil entering the oil cavity.

[0021] (2) The inner wall of the second matching part is provided with a plurality of sealing rings and forms a labyrinth cavity, and in some use scenarios, the labyrinth cavity can form the oil cavity, the plurality of sealing rings are arranged to slow down the flow speed of the lubricating oil, and the gap between the sealing ring and the transmission shaft can form an oil film during rotation, so that the labyrinth cavities separated by the matching gap are relatively independent, and the leakage of the lubricating oil is further blocked.

[0022] (3) In other use scenarios, for example, in outdoor environments, the labyrinth cavity can include a combination of an oil cavity and a water cavity, wherein the oil cavities are sequentially distributed along the first positive direction, the water cavities are sequentially distributed along the first negative direction, and then the water discharge grooves are arranged on the sealing rings corresponding to the water cavities, and are used for discharging water or other impurities infiltrated into the oil seal body from the outside to the inside. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described below in combination with the drawings and examples:

[0024] Figure 1 It is a structure schematic view of the bearing box labyrinth oil seal of the utility model embodiment 1;

[0025] Figure 2 It is a sectional view of the bearing box labyrinth oil seal of the utility model embodiment 1;

[0026] Figure 3 It is a sectional view of the bearing box labyrinth oil seal of the utility model embodiment 2;

[0027] Figure 4 It is a sectional view of the bearing box labyrinth oil seal of the utility model embodiment 3;

[0028] Figure 5 It is a sectional view of the bearing assembly of the utility model;

[0029] Figure 6 It is a local enlarged schematic view of the bearing assembly of the utility model.

[0030] Wherein: 1, oil seal body;

[0031] 10. Labyrinth cavity, 11. First mating portion, 12. Second mating portion, 121. Gap space, 13. Main body notch, 14. Sealing ring, 15. Oil cavity, 151. Oil drain groove, 16. Water cavity, 161. Water drain groove;

[0032] 2. Connecting part;

[0033] 3. Bearing box, 31. Bearing gland;

[0034] 4. Drive shaft, 41. Shoulder;

[0035] 5. Bearings. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0037] Example 1

[0038] like Figure 1 、 Figure 2 As shown, a bearing box labyrinth oil seal includes an oil seal body 1, which includes a first matching portion 11 and a second matching portion 12 arranged along the axial direction. A main body groove 13 for oil leakage is provided on the outer wall of the first matching portion 11, and a plurality of sealing rings 14 are provided on the inner wall of the second matching portion 12, and a labyrinth cavity 10 is formed between adjacent sealing rings 14.

[0039] Specifically, the first mating portion 11 is trumpet-shaped, and the opening size gradually increases from the side close to the second mating portion 12 to the side away from the second mating portion 12. It is used to cooperate with the shaft shoulder 41 in the assembled state. By reasonably controlling the gap size of the clearance fit, the probability of lubricating oil entering the labyrinth cavity 10 is minimized.

[0040] In this embodiment, if Figure 2 As shown, three sealing rings 14 are provided to form two labyrinth cavities 10 , wherein the labyrinth cavity 10 close to the first matching portion 11 is constructed as an oil cavity 15 , and the labyrinth cavity 10 away from the first matching portion 11 is constructed as a water cavity 16 .

[0041] An oil drain groove 151 is provided on the sealing ring 14 on the side of the oil chamber 15 that is biased towards the first matching portion 11; the oil drain groove 151 and the main body notch 13 are arranged on the same circumferential side direction of the oil seal body 1, and a small amount of lubricating oil entering the oil chamber 15 is thrown out along the normal direction of the rotation direction.

[0042] A drain groove 161 is provided on the sealing ring 14 on the side of the water cavity 16 away from the first matching portion 11. In an outdoor environment, water or other impurities will inevitably enter the water cavity 16 through the sealing ring 14. At this time, the water or other impurities in the water cavity 16 reach a certain level and can be discharged through the drain groove 161.

[0043] In this embodiment, the sealing ring 14 that separates the oil chamber 15 and the water chamber 16 is constructed as a separation ring, that is, the sealing ring 14 in the middle is a separation ring, and the separation ring is a complete closed annular structure, and the remaining sealing rings 14 are respectively provided with an oil drain groove 151 and a water drain groove 161.

[0044] In order to facilitate the installation of the oil seal body 1, a connecting portion 2 is further provided on the outer wall of the second matching portion 12; the connecting portion 2 is annular and is fixedly connected to or integrally formed with the second matching portion 12. Assembly holes are distributed on the connecting portion 2. In the assembled state, bolts are used to penetrate the assembly holes to achieve fixed installation of the overall structure.

[0045] Example 2

[0046] like Figure 3 As shown, a bearing box labyrinth oil seal includes an oil seal body 1, which includes a first matching portion 11 and a second matching portion 12 arranged along the axial direction. A main body groove 13 for oil leakage is provided on the outer wall of the first matching portion 11, and a plurality of sealing rings 14 are provided on the inner wall of the second matching portion 12, and a labyrinth cavity 10 is formed between adjacent sealing rings 14.

[0047] In this embodiment, a total of four sealing rings 14 are provided to form three labyrinth cavities 10 , wherein the two labyrinth cavities 10 close to the first matching portion 11 are constructed as oil chambers 15 , and the labyrinth chamber 10 away from the first matching portion 11 is constructed as a water chamber 16 .

[0048] The sealing ring 14 separating the oil chamber 15 and the water chamber 16 is constructed as a separator ring and presents a completely closed annular structure. In this embodiment 2, taking the figure as an example, the second sealing ring 14 from left to right is the separator ring, and the remaining sealing rings 14 are respectively provided with an oil drain groove 151 and a water drain groove 161.

[0049] Example 3

[0050] like Figure 4 As shown, a labyrinth oil seal for a bearing housing includes an oil seal body 1, which includes a first mating portion 11 and a second mating portion 12 arranged axially. A main body notch 13 for oil drainage is defined on the outer wall of the first mating portion 11, and a plurality of sealing rings 14 are formed on the inner wall of the second mating portion 12, with a labyrinth cavity 10 formed between adjacent sealing rings 14.

[0051] In this embodiment, the labyrinth cavity 10 is entirely constructed as an oil cavity 15 . In this case, the sealing ring 14 away from the first matching portion 11 is a completely closed annular structure, and the remaining sealing rings 14 are provided with oil drain grooves 151 .

[0052] In a specific application scenario, in a non-outdoor environment, since there will be no infiltration of rainwater and other impurities, the bearing box labyrinth oil seal disclosed in this embodiment 3 can be used.

[0053] Based on the disclosure of the above embodiments, the arrangement of the water cavity 16 can be selected as needed, and the arrangement of the oil cavity 15 is used to form a multi-stage sealing leak-proof structure.

[0054] Of course, it should be noted that in other embodiments, if the labyrinth cavity 10 is composed of the oil cavity 15 and the water cavity 16, other numbers of oil cavities 15 and water cavities 16 can also be provided, and the definition of the oil cavity 15 and the water cavity 16 is set as the axial direction from the first matching part 11 to the second matching part 12 as the first positive direction, and the axial direction from the second matching part 12 to the first matching part 11 as the first negative direction. The labyrinth cavity 10 includes at least one oil cavity 15 distributed along the first positive direction, and at least one water cavity 16 distributed along the first negative direction; each oil cavity 15 is provided with an oil leakage groove 151 on the sealing ring 14 deviated from the first matching part 11; the oil leakage groove 151 is arranged on the same circumferential side of the oil seal body 1 as the main groove 13; and each water cavity 16 is provided with a water leakage groove 161 on the sealing ring 14 away from the first matching part 11.

[0055] The utility model discloses still a kind of bearing assembly, as shown in figure Figure 5 Including bearing box 3, transmission shaft 4, bearing 5 and oil seal body 1.

[0056] Transmission shaft 4 passes through bearing box 3 and is arranged, and transmission shaft 4 has shaft shoulder 41.

[0057] Bearing 5 is installed between bearing box 3 and transmission shaft 4, wherein the inner ring of bearing 5 is fixedly matched with transmission shaft 4, and is abutted with shaft shoulder 41, and the outer ring of bearing 5 is fixedly matched with bearing box 3;The fixedly matched mode can adopt interference fit.

[0058] Oil seal body 1 is directly or indirectly fixedly connected with bearing box 3, in the embodiment, bearing box 3 is provided with bearing gland 31 for limiting bearing 5, bearing gland 31 is fixedly connected with bearing box 3, oil seal body 1 is fixedly connected with bearing gland 31, and the indirect fixed connection of oil seal body 1 and bearing box 3 is realized. At the same time, when assembling, main groove 13 needs to be arranged upwards, to prevent oil seal body 1 from leaking when immersed in lubricating oil.

[0059] As shown in figure Figure 6 In assembled state, shaft shoulder 41 is accommodated in first matching part 11, and the thickness of shaft shoulder 41 along axial direction is less than the length of first matching part 11 along axial direction, so that clearance space 121 is formed in first matching part 11, and clearance space 121 is communicated with main groove 13, so that a small amount of lubricating oil entering clearance space 121 can be thrown out from main groove 13.

[0060] In this utility model, the first mating portion 11 cooperates with the shaft shoulder 41 to achieve primary leakage prevention. The multiple sealing rings 14 form an oil film between the seal and the transmission shaft 4, further preventing lubricant leakage. Even if a small amount of lubricant seeps into the oil seal body 1, it can be drained into the bearing housing 3 along the normal direction of rotation through the oil drain groove 151 and the main body notch 13. Furthermore, in outdoor environments, if a small amount of rainwater or impurities enter the oil seal body 1, they can be drained through the drain groove 161.

[0061] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they are not intended to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A bearing box labyrinth oil seal, characterized in that: The oil seal body (1) comprises a first matching portion (11) and a second matching portion (12) arranged along the axial direction, a main body notch (13) for oil leakage is provided on the outer wall of the first matching portion (11), and a plurality of sealing rings (14) are provided on the inner wall of the second matching portion (12), and a labyrinth cavity (10) is formed between adjacent sealing rings (14).

2. The bearing box labyrinth oil seal according to claim 1, characterized in that: The first matching portion (11) is trumpet-shaped, and the size of the opening gradually increases from the side close to the second matching portion (12) to the side away from the second matching portion (12).

3. The bearing box labyrinth oil seal according to claim 1, characterized in that: The axial direction from the first matching portion (11) to the second matching portion (12) is set as a first positive direction; The labyrinth cavity (10) comprises at least one oil cavity (15) distributed along a first positive direction, and an oil drain groove (151) is provided on the sealing ring (14) on the side of each oil cavity (15) biased toward the first matching portion (11); the oil drain groove (151) and the main body notch (13) are provided in the same circumferential direction of the oil seal body (1).

4. The labyrinth oil seal for a bearing box according to claim 3, characterized in that: The axial direction from the second matching portion (12) to the first matching portion (11) is set as a first reverse direction; The labyrinth cavity (10) further comprises at least one water cavity (16) distributed along the first reverse direction, and a water drain groove (161) is provided on the sealing ring (14) on the side of each water cavity (16) away from the first matching portion (11).

5. The bearing box labyrinth oil seal according to claim 4, characterized in that: The sealing ring (14) separating the oil chamber (15) and the water chamber (16) is constructed as a separation ring, and the separation ring is a completely closed annular structure.

6. The bearing box labyrinth oil seal according to claim 1, characterized in that: A connecting portion (2) is further provided on the outer wall of the second matching portion (12); the connecting portion (2) is annular and is fixedly connected to or integrally formed with the second matching portion (12); and assembly holes are distributed on the connecting portion (2).

7. A bearing assembly, characterized in that: include: Bearing box (3); A transmission shaft (4) is arranged to pass through the bearing box (3); A bearing (5) is installed between the bearing box (3) and the transmission shaft (4), wherein the inner ring of the bearing (5) is fixedly matched with the transmission shaft (4), and the outer ring of the bearing (5) is fixedly matched with the bearing box (3); An oil seal body (1) is directly or indirectly fixedly connected to the bearing box (3), wherein the oil seal body (1) comprises a first matching portion (11) and a second matching portion (12) arranged along the axial direction, wherein a main body notch (13) for oil leakage is provided on the outer wall of the first matching portion (11), and a plurality of sealing rings (14) are provided on the inner wall of the second matching portion (12), and a labyrinth cavity (10) is formed between adjacent sealing rings (14).

8. The bearing assembly according to claim 7, characterized in that: The transmission shaft (4) has a shaft shoulder (41), and the inner ring of the bearing (5) abuts against the shaft shoulder (41); the first matching portion (11) is trumpet-shaped and matches the shaft shoulder (41).

9. The bearing assembly according to claim 8, characterized in that: The shoulder is accommodated in the first fitting portion (11), and the thickness of the shoulder (41) along the axial direction is smaller than the length of the first fitting portion (11) along the axial direction, so that a gap space (121) is formed in the first fitting portion (11), and the gap space (121) is connected to the main body notch (13).

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