Dynamic sealing structure for rotating mechanism

Abstract

The utility model relates to a dynamic sealing structure for a rotating mechanism, which comprises a rotor framework, a stator framework, a dynamic sealing elastic body and a stator sealing ring, and the rotor framework comprises a lower outer tube, an upper outer tube, an upper inner tube and a bottom ring of the rotor framework; the stator framework comprises a stator framework pipe and a bottom ring; the dynamic sealing elastic body is fixed on an upper outer pipe, an upper inner pipe and a bottom ring of the rotor framework, and at least two annular sealing lips which are obliquely arranged upwards and at least one annular sealing lip which is obliquely arranged downwards are arranged on the dynamic sealing elastic body corresponding to the inner circle position of the bottom ring of the rotor framework; dynamic sealing elastic body sawteeth are arranged on the outer circle of the dynamic sealing elastic body corresponding to the outer circle position of the outer pipe at the upper part of the rotor framework; a stator sealing ring is fixed on the stator skeleton tube recess, and stator sealing ring inner circle sawteeth are arranged on the inner circle of the stator sealing ring. According to the utility model, the interference fit between the plurality of annular sealing lips and the stator framework pipe is used for sealing, and the dynamic sealing performance is good.

Description

Technical Field

[0001] This utility model belongs to the field of dynamic sealing technology, and specifically discloses a dynamic sealing structure for a rotating mechanism. Background Technology

[0002] Rotating mechanisms present greater challenges to dynamic seals due to the large air gap radius between the stator and rotor and the relative motion between them. Some rotating mechanisms operate in humid environments, even where water may be present. This necessitates that the dynamic seal not only prevent external dust and impurities from entering the rotating mechanism, but also prevent water and other liquids from entering.

[0003] Currently, the dynamic seal structure for rotating mechanisms on the market has poor sealing performance, especially when the rotating mechanism is submerged in water, which can easily cause water leakage from the dynamic seal and lead to damage to the rotating mechanism.

[0004] Poor durability performance; after the rotating mechanism has been running for a period of time, changes in the external environment, such as temperature, altitude, and atmospheric pressure, can cause the dynamic sealing structure to fail, resulting in water leakage and impurity infiltration at the dynamic sealing structure of the rotating mechanism.

[0005] For some rotating mechanisms with high linear speeds, the linear speed can even reach more than 30 m / s under certain working conditions. If some dynamic seal structures do not adopt good friction-resistant and lubrication technologies, it will also lead to dynamic seal failure.

[0006] Some dynamic seal structures, although they have a good sealing effect, have high friction and are difficult to install, maintain and service. For example, some labyrinth dynamic seal structures increase the relative friction between the stator and rotor to several Newton-meters or even tens of Newton-meters. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dynamic sealing structure for a rotating mechanism with good dynamic sealing effect.

[0008] According to the technical solution provided by this utility model, the rotating mechanism uses a dynamic sealing structure, which includes a rotor frame, a stator frame, a dynamic sealing elastomer and a stator sealing ring, with the stator frame located inside the rotor frame.

[0009] The rotor frame includes a lower outer tube, an upper outer tube, an upper inner tube, and a bottom ring. The upper end of the lower outer tube is fixed to the lower end of the upper outer tube, and the upper end of the upper outer tube is fixed to the upper end of the upper inner tube. The inner circle of the upper outer tube is fitted to the outer circle of the upper inner tube. The outer circle of the bottom ring is fixed to the inner circle of the lower end of the upper inner tube. The outer circle of the upper inner tube is located inside the outer circle of the lower outer tube.

[0010] The stator frame includes a stator frame tube and a stator frame bottom ring. The outer circle of the stator frame tube and the inner circle of the stator frame bottom ring are fixed together. A stator frame tube recess is provided on the inner circle of the upper end of the stator frame tube.

[0011] The dynamic sealing elastomer is fixed on the upper outer tube of the rotor skeleton, the upper inner tube of the rotor skeleton, and the bottom ring of the rotor skeleton. At least two upward-sloping annular sealing lips and at least one downward-sloping annular sealing lip are provided on the dynamic sealing elastomer at the inner circle position of the bottom ring of the rotor skeleton. All annular sealing lips are interference-fitted with the outer circle of the stator skeleton tube. The interference fit between the annular sealing lip and the outer circle of the stator skeleton tube gradually decreases from top to bottom. The outer circle of the dynamic sealing elastomer at the outer circle position of the upper outer tube of the rotor skeleton is provided with dynamic sealing elastomer serrations. The dynamic sealing elastomer serrations are annular structures and protrude outward from the outer circle of the lower outer tube of the rotor skeleton.

[0012] The stator sealing ring is fixed on the recess of the stator skeleton tube. The inner circle of the stator sealing ring is provided with inner circle serrations. The inner circle serrations of the stator sealing ring are annular structures and protrude inward from the inner circle of the stator skeleton tube.

[0013] Preferably, the inner circle of the rotor skeleton bottom ring is located between the outer circle of the stator skeleton bottom ring and the outer circle of the stator skeleton tube.

[0014] Preferably, the distance between the serrations of the dynamic sealing elastomer protruding outward from the outer circumference of the lower outer tube of the rotor frame is 0.15-0.25 mm.

[0015] Preferably, the distance by which the inner serrations of the stator sealing ring protrude inward from the inner circle of the stator skeleton tube is 0.15-0.25 mm.

[0016] This invention achieves sealing through an interference fit between multiple annular sealing lips and the stator skeleton tube, resulting in excellent dynamic sealing performance. Furthermore, compared to other dynamic sealing structures (such as labyrinth seals), this structure inherently reduces friction. Lubricating grease can be filled between adjacent annular sealing lips, significantly reducing the frictional torque caused by the dynamic seal. In addition to lubrication, this grease also provides sealing, oxidation resistance, and corrosion resistance. Attached Figure Description

[0017] Figure 1 This is a diagram showing the usage state of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] A dynamic seal structure for a rotating mechanism, such as Figure 1 and Figure 2 As shown, it includes a rotor frame 1, a stator frame 2, a dynamic sealing elastomer 3, and a stator sealing ring 4, with the stator frame 2 located inside the rotor frame 1.

[0021] The rotor frame 1 includes a lower outer tube 1.1, an upper outer tube 1.2, an upper inner tube 1.3, and a bottom ring 1.4. The upper end of the lower outer tube 1.1 is fixedly connected to the lower end of the upper outer tube 1.2, and the upper end of the upper outer tube 1.2 is fixedly connected to the upper end of the upper inner tube 1.3. The inner circle of the upper outer tube 1.2 fits against the outer circle of the upper inner tube 1.3. The outer circle of the bottom ring 1.4 is fixedly connected to the inner circle of the lower end of the upper inner tube 1.3. The outer circle of the upper outer tube 1.2 is located inside the outer circle of the lower outer tube 1.1.

[0022] The stator frame 2 includes a stator frame tube 2.1 and a stator frame bottom ring 2.2. The outer circle of the stator frame tube 2.1 and the inner circle of the stator frame bottom ring 2.2 are fixed together. A stator frame tube recess 2.11 is provided on the inner circle of the upper end of the stator frame tube 2.1.

[0023] The dynamic sealing elastomer 3 is fixed on the upper outer tube 1.2 of the rotor frame, the upper inner tube 1.3 of the rotor frame, and the bottom ring 1.4 of the rotor frame. At least two upward-facing annular sealing lips 3.1 and at least one downward-facing annular sealing lip 3.1 are provided on the dynamic sealing elastomer 3 at the inner circle position corresponding to the bottom ring 1.4 of the rotor frame. All annular sealing lips 3.1 are interference-fitted with the outer circle of the stator frame tube 2.1. In the direction from top to bottom, the interference fit between the annular sealing lips 3.1 and the outer circle of the stator frame tube 2.1 gradually decreases. The outer circle of the dynamic sealing elastomer 3 at the outer circle position corresponding to the upper outer tube 1.2 of the rotor frame is provided with dynamic sealing elastomer serrations 3.2. The dynamic sealing elastomer serrations 3.2 are annular structures and protrude outward from the outer circle of the lower outer tube 1.1 of the rotor frame.

[0024] The stator sealing ring 4 is fixed on the stator skeleton tube recess 2.11. The inner circle of the stator sealing ring 4 is provided with stator sealing ring inner circle sawtooth 4.1. The stator sealing ring inner circle sawtooth 4.1 has an annular structure and the stator sealing ring inner circle sawtooth 4.1 protrudes inward from the inner circle of the stator skeleton tube 2.1.

[0025] The inner circle of the rotor skeleton bottom ring 1.4 is located between the outer circle of the stator skeleton bottom ring 2.2 and the outer circle of the stator skeleton tube 2.1.

[0026] The distance between the outward protrusion of the sawtooth 3.2 of the dynamic sealing elastomer and the outer circle of the lower outer tube 1.1 of the rotor frame is 0.15-0.25mm.

[0027] The distance between the inner serration 4.1 of the stator sealing ring and the inner circle of the stator skeleton tube 2.1 is 0.15-0.25mm.

[0028] In practical use, the outer circle of the lower outer tube 1.1 of the rotor frame is fixed to the inner circle of the rotor 5. The serrations 3.2 of the dynamic sealing elastomer seal between the lower outer tube 1.1 of the rotor frame and the rotor 5. The inner circle of the stator frame tube 2.1 is fixed to the outer circle of the stator 6. The serrations 4.1 of the inner circle of the stator sealing ring seal between the stator frame tube 2.1 and the stator 6. This rubber-coating sealing effect is more robust and reliable than that of potting compound.

[0029] In this invention, both the dynamic sealing elastomer 3 and the stator sealing ring 4 are made of fluororubber, which has excellent high-temperature resistance. During use, when the motor runs at high speed and drives the rotor through the shaft 7, the high temperature generated by friction between the annular sealing lip 3.1 of the dynamic sealing elastomer 3 and the outer circle of the stator skeleton tube 2.1 will not cause the dynamic seal between the annular sealing lip 3.1 and the stator skeleton tube 2.1 to fail.

[0030] In this invention, the uppermost annular sealing lip 3.1 has the largest interference fit, playing a major sealing role and effectively isolating external dust, impurities, and liquids. High-performance grease is filled between adjacent annular sealing lips 3.1. Since the annular sealing lips 3.1 and the outer circumference of the stator frame tube 2.1 are both interference-fitted, the grease remains within the gap formed by the adjacent annular sealing lips 3.1, providing excellent lubrication and significantly reducing the frictional torque caused by the dynamic seal. The grease also provides sealing, corrosion protection, and oxidation resistance. Compared to other dynamic seal structures, such as labyrinth designs, the multi-annular sealing lip 3.1 inherently reduces friction significantly.

[0031] In this utility model, the annular sealing lip 3.1, which is inclined upward, is press-fitted with the outer circle of the stator frame tube 2.1, and its edge will be raised upward. The inner circle of the uppermost annular sealing lip 3.1 and the outer circle of the stator frame tube 2.1 will form a relatively open space with a cross-section similar to a V-shape. When liquids enter this space, the liquid can also be dissipated to the outside through this space in a dry environment, effectively preventing moisture and other liquids from being stored inside the dynamic sealing structure for a long time.

[0032] In this utility model, the bending structure design of the rotor frame 1 takes into account that the outer circle of the upper outer tube 1.2 of the rotor frame is located inside the outer circle of the lower outer tube 1.1 of the rotor frame, and the outer circle of the dynamic sealing elastomer 3 at the corresponding position of the outer circle of the upper outer tube 1.2 of the rotor frame is provided with dynamic sealing elastomer serrations 3.2. The dynamic sealing elastomer serrations 3.2 seal the lower outer tube 1.1 of the rotor frame and the rotor 5 through the dynamic sealing elastomer serrations 3.2. At the same time, it saves materials and conforms to the concept of lightweight design of dynamic sealing structure.

[0033] In this utility model, the stator frame 2 includes a stator frame tube 2.1 and a stator frame bottom ring 2.2. When the stator frame 2 is installed in the motor stator, the stator frame 2 can play a good positioning role.

[0034] In this invention, at least two upward-facing annular sealing lips 3.1 and at least one downward-facing annular sealing lip 3.1 are provided on the dynamic sealing elastomer 3 at the inner circle position corresponding to the rotor skeleton bottom ring 1.4. All annular sealing lips 3.1 are interference-fitted with the outer circle of the stator skeleton tube 2.1, and the interference fit between the annular sealing lips 3.1 and the outer circle of the stator skeleton tube 2.1 gradually decreases from top to bottom. This can significantly reduce the frictional torque caused by the dynamic seal. In addition to lubrication, the grease also has sealing, anti-oxidation, and anti-corrosion properties. Compared with some other dynamic seal structures, such as the labyrinth design, the multi-annular sealing lips 3.1 themselves have much reduced friction.

[0035] The dynamic sealing structure of this utility model is relatively simple, and it is very convenient to disassemble, maintain and repair after a failure.

[0036] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A dynamic sealing structure for a rotating mechanism, characterized in that: It includes a rotor frame (1), a stator frame (2), a dynamic sealing elastomer (3), and a stator sealing ring (4), with the stator frame (2) located inside the rotor frame (1); The rotor frame (1) includes a lower outer tube (1.1), an upper outer tube (1.2), an upper inner tube (1.3), and a bottom ring (1.4). The upper end of the lower outer tube (1.1) is fixed to the lower end of the upper outer tube (1.2). The upper end of the upper outer tube (1.2) is fixed to the upper end of the upper inner tube (1.3). The inner circle of the upper outer tube (1.2) is fitted to the outer circle of the upper inner tube (1.3). The outer circle of the bottom ring (1.4) is fixed to the inner circle of the lower end of the upper inner tube (1.3). The outer circle of the upper outer tube (1.2) is located inside the outer circle of the lower outer tube (1.1). The stator frame (2) includes a stator frame tube (2.1) and a stator frame bottom ring (2.2). The outer circle of the stator frame tube (2.1) and the inner circle of the stator frame bottom ring (2.2) are fixed together. A stator frame tube recess (2.11) is provided on the inner circle of the upper end of the stator frame tube (2.1). The dynamic sealing elastomer (3) is fixed on the upper outer tube (1.2) of the rotor skeleton, the upper inner tube (1.3) of the rotor skeleton, and the bottom ring (1.4) of the rotor skeleton. At least two upward-facing annular sealing lips (3.1) and at least one downward-facing annular sealing lip (3.1) are provided on the dynamic sealing elastomer (3) at the inner circle position corresponding to the bottom ring (1.4) of the rotor skeleton. All annular sealing lips (3.1) are perpendicular to the outer circle of the stator skeleton tube (2.1). The interference fit is provided, and the amount of interference fit between the annular sealing lip (3.1) and the outer circle of the stator frame tube (2.1) gradually decreases from top to bottom. The dynamic sealing elastomer (3) at the position of the outer circle of the upper outer tube (1.2) of the rotor frame is provided with a dynamic sealing elastomer sawtooth (3.2). The dynamic sealing elastomer sawtooth (3.2) is annular and protrudes outward from the outer circle of the lower outer tube (1.1) of the rotor frame. The stator sealing ring (4) is fixed on the stator skeleton tube recess (2.11). The inner circle of the stator sealing ring (4) is provided with stator sealing ring inner circle sawtooth (4.1). The stator sealing ring inner circle sawtooth (4.1) is an annular structure. The stator sealing ring inner circle sawtooth (4.1) protrudes inward from the inner circle of the stator skeleton tube (2.1).

2. The dynamic sealing structure for a rotating mechanism as described in claim 1, characterized in that: The inner circle of the rotor skeleton bottom ring (1.4) is located between the outer circle of the stator skeleton bottom ring (2.2) and the outer circle of the stator skeleton tube (2.1).

3. The dynamic sealing structure for a rotating mechanism as described in claim 1, characterized in that: The distance between the sawtooth (3.2) of the dynamic sealing elastomer protruding outward from the outer circle of the lower outer tube (1.1) of the rotor skeleton is 0.15-0.25mm.

4. The dynamic sealing structure for a rotating mechanism as described in claim 1, characterized in that: The distance between the inner serrations (4.1) of the stator sealing ring and the inner circle of the stator skeleton tube (2.1) is 0.15-0.25mm.

Images