Ultrahigh-speed shaft seal

Abstract

The utility model belongs to the technical field of motors, and particularly relates to an ultra-high-speed shaft seal which comprises a framework arranged outside a main shaft in a sleeving mode. Wherein the exterior of the framework is coated with a flexible material to form a shaft seal body; at least three lip parts are arranged on the inner wall of the shaft seal body from top to bottom and attached to the outer wall of a main shaft. The third lip part is additionally arranged on the basis of the main lip and the auxiliary lip, grease can be stored in the shaft seal through the three-lip design and is not prone to loss, the contact face of the third lip and the shaft is wider than that of the other two lips, and polytetrafluoroethylene has excellent self-lubricating performance. The sealing performance of the shaft seal is prevented from being affected by abrasion under the conditions of ultrahigh rotating speed and positive and negative rotation of the motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to an ultra-high-speed shaft seal. Background Art

[0002] On the rotating main shaft of the motor used in new energy vehicles, a sealing lip sleeve formed of elastic rubber is arranged on the outer wall of the main shaft. The existing patent application number is CN201990000982.0, which provides a lip-shaped shaft seal device. The first lip and the second lip are designed in the patent to meet the sealing and lubrication between the shaft seal and the outer wall of the main shaft. However, during the ultra-high-speed rotation or forward and reverse rotation of the main shaft, the design is prone to wear, which affects the sealing effect.

[0003] Therefore, an ultra-high speed shaft seal is designed to solve the technical problem in the prior art that the shaft seal lip is difficult to maintain sealing under ultra-high speed rotation of the main shaft. Utility Model Content

[0004] The purpose of the utility model is to provide an ultra-high speed shaft seal to solve the above technical problems.

[0005] In order to solve the above technical problems, the utility model provides an ultra-high speed shaft seal, comprising:

[0006] A frame sleeved on the outside of the main shaft; wherein

[0007] The exterior of the frame is covered with a flexible material to form a shaft seal body; and

[0008] At least three lips are arranged on the inner wall of the shaft seal body from top to bottom to fit with the outer wall of the main shaft.

[0009] Furthermore, the three lips are respectively a main lip, an auxiliary lip and a polytetrafluoroethylene lip from top to bottom;

[0010] The thickness of the main lip is greater than that of the auxiliary lip and the PTFE lip; and

[0011] The lip head portion of the main lip in contact with the outer wall of the main shaft is larger than the lip tail portion away from the outer wall of the main shaft; and

[0012] The main lip is interference fit with the main shaft.

[0013] Further, the thickness of the auxiliary lip is smaller than that of the main lip; and

[0014] The auxiliary lip is interference fit with the main shaft;

[0015] The interference between the main lip and the main shaft is greater than the interference between the auxiliary lip and the main shaft.

[0016] Further, the contact area between the polytetrafluoroethylene lip and the outer wall of the main shaft is larger than the contact area between the main lip and the main shaft; and

[0017] The contact area between the polytetrafluoroethylene lip and the outer wall of the main shaft is greater than the contact area between the auxiliary lip and the main shaft.

[0018] Furthermore, grease is filled between the main lip and the auxiliary lip; and

[0019] Grease is filled between the auxiliary lip and the polytetrafluoroethylene lip.

[0020] Furthermore, the main lip and the auxiliary lip are made of fluororubber.

[0021] Furthermore, the material of the tetrafluoroethylene lip is polytetrafluoroethylene.

[0022] Furthermore, the skeleton is arranged in an L shape.

[0023] The beneficial effect of the utility model is that the utility model adds a third lip on the basis of the main lip and the auxiliary lip, and utilizes a three-lip design so that grease can be stored inside the shaft seal and is not easy to lose, and the contact surface between the third lip and the shaft is wider than the other two lips. The polytetrafluoroethylene itself also has excellent self-lubricating properties, which can meet the requirements of avoiding the shaft seal from being affected by wear under ultra-high speed and forward and reverse rotation of the motor.

[0024] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a plan sectional view of the utility model.

[0028] In the figure:

[0029] 1. Spindle;

[0030] 2. Shaft seal body; 20. Rubber; 21. Main lip; 22. Auxiliary lip; 23. PTFE lip; 24. Frame;

[0031] 3. Oil. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] On the rotating main shaft of the motor used in new energy vehicles, a sealing lip sleeve formed of elastic rubber is arranged on the outer wall of the main shaft. The first lip and the second lip are designed in the existing shaft seal to meet the sealing and lubrication between the shaft seal and the outer wall of the main shaft. However, during the ultra-high-speed rotation or forward and reverse rotation of the main shaft, this design is prone to wear, which affects the sealing effect.

[0034] To solve the above technical problems, in at least one embodiment, an ultra-high-speed shaft seal is provided, comprising: a skeleton 21 sleeved on the outside of the main shaft 1; wherein the outside of the skeleton 21 is covered with a flexible material to form a shaft seal body 2; and on the inner wall of the shaft seal body 2, at least three lips are arranged from top to bottom to fit with the outer wall of the main shaft 1.

[0035] By adding a third lip on the basis of the main lip 21 and the auxiliary lip 22, the grease can be stored in the shaft seal 2 using a three-lip design and is not easy to lose. The contact surface between the third lip and the main shaft 1 is wider than the other two lips. Polytetrafluoroethylene itself has excellent self-lubricating properties, which can prevent the shaft seal 2 from affecting the sealing due to wear when the motor is in ultra-high speed and forward and reverse rotation.

[0036] In some embodiments, the shaft seal 2 is sleeved on the outer wall of the main shaft 1, and the main lip 21 is divided into two parts. The thickness of the part close to the outer wall of the main shaft 1 is greater than the part away from the main shaft 1, and the main lip 21 is interference fit with the main shaft 1. The material of the main lip is preferably low-friction fluororubber material with good wear resistance and high temperature resistance. By setting the main lip 21, foreign particles can be effectively prevented from entering the interior of the shaft seal wall to avoid affecting the sealing performance of the shaft seal 2. After the main lip 21 is fitted with the outer wall of the main shaft 1, the upper end surface of the main lip 21 is perpendicular to the outer wall of the main shaft 1. Compared with the upper end surface of the main lip 21 in the prior art, there is a gap between the main lip 21 and the outer wall of the main shaft 1 to avoid the accumulation of flying chips, and to avoid the accumulated flying chips after long-term work to wear the main lip 21 and thus affect its sealing performance. The upper end surface of the main lip 21 can be designed to be perpendicular to the outer wall of the main shaft 1, or the upper end surface of the main shaft 21 close to the main shaft 1 can be lifted to design the cross-section of the main lip 21 to be conical to avoid the accumulation of flying chips.

[0037] In some embodiments, the material of the auxiliary lip 22 is consistent with that of the main lip 21, both of which are low-friction fluororubber materials. Compared with the main lip 21, it adopts a low-holding design, has a thickness smaller than the main lip 21, and an interference fit smaller than the interference fit between the main lip and the main shaft 1, thereby effectively reducing the motor load while playing a sealing role.

[0038] In some embodiments, the tetrafluoroethylene lip 23 is made of polytetrafluoroethylene, and the contact area of ​​the tetrafluoroethylene lip 23 on the main shaft 1 is larger than the contact area of ​​the other two lips on the main shaft 1. Polytetrafluoroethylene itself has excellent self-lubricating properties, and is resistant to acids and alkalis, various organic solvents, wear and high temperatures. It also has an extremely low friction coefficient and strong deflection resistance, which ensures that the motor is not easily worn during ultra-high speed and forward and reverse rotation, thereby increasing the service life of the shaft seal 2.

[0039] In some embodiments, grease is filled inside the shaft seal 2, i.e., between the main lip 21 and the auxiliary lip 22, and between the auxiliary lip 22 and the polytetrafluoroethylene lip 23. Thanks to the three-lip design, the grease can be stored inside the shaft seal and is not easily lost. Preferably, the grease is food grade and has good water resistance and corrosion resistance.

[0040] In some embodiments, the skeleton 24 is designed to be "L-shaped" to provide sufficient support for the shaft seal 2. A flexible material is used to cover the skeleton 24 to form the shaft seal body 2. The flexible material is preferably rubber.

[0041] In summary, by adding a third lip on the basis of the main lip and the auxiliary lip, the grease can be stored inside the shaft seal using the three-lip design and is not easy to lose. The contact surface between the third lip and the main shaft is wider than the other two lips. Polytetrafluoroethylene itself has excellent self-lubricating properties, which can meet the requirements of avoiding the shaft seal from affecting the sealing due to wear under ultra-high speed and forward and reverse rotation of the motor.

[0042] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An ultra-high speed shaft seal, characterized in that: include: A frame sleeved on the outside of the main shaft; in The exterior of the frame is covered with a flexible material to form a shaft seal body; and At least three lips are arranged on the inner wall of the shaft seal body from top to bottom to fit with the outer wall of the main shaft.

2. The ultra-high speed shaft seal according to claim 1, characterized in that: The three lips are respectively a main lip, an auxiliary lip and a PTFE lip from top to bottom; The thickness of the main lip is greater than that of the auxiliary lip and the PTFE lip; and The lip head portion of the main lip in contact with the outer wall of the main shaft is larger than the lip tail portion away from the outer wall of the main shaft; and The main lip is interference fit with the main shaft.

3. The ultra-high speed shaft seal according to claim 2, characterized in that: The secondary lip is thinner than the primary lip; and The auxiliary lip is interference fit with the main shaft; wherein The interference between the main lip and the main shaft is greater than the interference between the auxiliary lip and the main shaft.

4. The ultra-high speed shaft seal according to claim 3, characterized in that: The contact area between the polytetrafluoroethylene lip and the outer wall of the main shaft is larger than the contact area between the main lip and the main shaft; and The contact area between the polytetrafluoroethylene lip and the outer wall of the main shaft is greater than the contact area between the auxiliary lip and the main shaft.

5. The ultra-high speed shaft seal according to claim 4, characterized in that: Grease is filled between the main lip and the auxiliary lip; and Grease is filled between the auxiliary lip and the polytetrafluoroethylene lip.

6. The ultra-high speed shaft seal according to claim 5, characterized in that: The main lip and the auxiliary lip are made of fluororubber.

7. The ultra-high speed shaft seal according to claim 6, characterized in that: The material of the tetrafluoroethylene lip is polytetrafluoroethylene.

8. The ultra-high speed shaft seal according to claim 7, characterized in that: The frame is arranged in an L shape.

Images