Composite dynamic shaft seal structure

Abstract

The utility model discloses a combined type dynamic shaft seal structure, and relates to the technical field of pump sealing, in particular to the combined type dynamic shaft seal structure. According to the labyrinth oil seal, the labyrinth oil seal is composed of a plurality of annular teeth and grooves which are alternately arranged, the length and complexity of a leakage path are increased, and the labyrinth oil seal is installed on a shaft after being matched with a bearing gland; the lip-shaped sealing piece is fixed on the shaft through the dustproof disc; the lip-shaped sealing piece is matched with the section of the labyrinth oil seal under certain contact pressure; during rotation, the lip-shaped sealing piece is disengaged due to the action of centrifugal force, abrasion is prevented, the lip-shaped sealing piece makes contact with the section of the oil seal during parking, and external impurities are prevented from entering the lip-shaped sealing piece. The sealing oil seal, the lip-shaped sealing piece and the dustproof disc are combined, so that the reliability of the shaft seal is improved. According to the technical scheme, the problems that in the prior art, a contact type oil seal is long in service life, complex in structure, limited in single sealing mode, poor in sealing effect, high in cost and the like are solved.

Description

Composite dynamic shaft seal structure Technical Field

[0001] This utility model relates to the field of pump sealing technology, and in particular to a composite dynamic shaft seal structure. Background Technology

[0002] Composite dynamic shaft seal structures can be used in heavy-duty engineering machinery, high-speed rotating equipment, precision instruments and other application scenarios. They can be applied to markets such as petrochemicals and metallurgy, and can provide excellent sealing effects for various fluid media, gases, liquids and fluids containing solid particles.

[0003] Existing composite dynamic shaft seals, such as mechanical oil seals, have complex structures and high installation requirements. Their operational stability is also affected by the fact that the lip of the oil seal is in direct contact with the shaft surface, making them prone to wear and resulting in a decrease in sealing performance.

[0004] In view of the problems existing in the above-mentioned existing technologies, it is necessary to study and design a new type of composite dynamic shaft seal structure to overcome the problems existing in the existing technologies. Summary of the Invention

[0005] To address the technical problems of existing contact oil seals, such as limited lifespan, complex structure, single sealing method, poor sealing effect, and high cost, a composite dynamic shaft seal structure is provided. This invention primarily utilizes a non-contact seal formed during operation to reduce wear, and a lip seal that contacts the oil seal end face during shutdown to prevent external debris from entering. The structure is simple, thereby improving shaft seal lifespan, reducing costs, and enhancing shaft seal reliability.

[0006] The technical means adopted in this utility model are as follows:

[0007] A composite dynamic shaft seal structure includes: a labyrinth oil seal, a bearing gland, a lip seal, a dustproof disc, and a shaft;

[0008] The labyrinth oil seal is fitted onto the shaft after being combined with the bearing cap;

[0009] The lip seal is fixed to the shaft by a dustproof disc; through calculation and experimental verification, the positioning dimensions of the dustproof disc and the centrifugal force required for the deformation of the lip seal are obtained, thus achieving the dual functions of dynamic sealing and static leak prevention.

[0010] Furthermore, the lip seal mates with the cross-section of the labyrinth seal under a certain contact pressure;

[0011] Furthermore, the combination of the sealing oil seal, lip seal, and dust cover improves the reliability of the shaft seal.

[0012] Furthermore, the labyrinth seal consists of multiple alternating ring teeth and grooves, increasing the length and complexity of the leakage path.

[0013] Furthermore, the labyrinth oil seal is equipped with an external water return groove to prevent external water accumulation.

[0014] Furthermore, during rotation, the lip seal disengages due to centrifugal force, preventing wear.

[0015] Furthermore, the lip seal contacts the oil seal section when the vehicle is stopped, preventing external impurities from entering.

[0016] Furthermore, the dust cover is positioned outside the lip seal to prevent splashing of external flushing fluid and rainwater.

[0017] Furthermore, in the operating state: the lip seal slightly detaches from the oil seal surface due to centrifugal force, reducing frictional loss, and the dust pan acts as a static protective barrier to block external debris; in the shutdown state: the lip seal rests on the oil seal surface due to the calculated frictional stress, preventing media leakage.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The composite dynamic shaft seal structure provided by this utility model features a reasonable structural design between the lip seal and the shaft. The contact pressure between the lip seal and the labyrinth oil seal is calculated to achieve a good sealing effect.

[0020] 2. The composite dynamic shaft seal structure provided by this utility model has excellent sealing effect during operation and shutdown, simple structure, and significantly reduced cost compared with mechanical oil seals with the same function;

[0021] 3. The composite dynamic shaft seal structure provided by this utility model forms a non-contact seal during operation, which prevents wear, extends the replacement cycle, and reduces maintenance costs. When stopped, it forms a contact seal with zero leakage and can prevent external impurities from entering. The shaft seal forms a contact and non-contact sealing mechanism under different working conditions, which increases the reliability of the shaft seal and supports stable operation in extreme environments such as high speed, high temperature, and dust.

[0022] 4. The composite dynamic shaft seal structure provided by this utility model is widely used in general industries such as petrochemicals and papermaking, as well as in technical fields such as precision instruments, energy equipment, and heavy-duty machinery.

[0023] In summary, the technical solution of this utility model solves the problems of limited lifespan, complex structure, single sealing form, poor sealing effect, and high cost of existing contact oil seals. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the structure of this utility model;

[0026] Figure 2 is a schematic diagram of the lip seal in operation of this utility model;

[0027] Figure 3 is a schematic diagram of the lip seal state when the device is parked.

[0028] In the diagram: 1. Labyrinth oil seal; 2. Bearing end cap; 3. Lip seal; 4. Dustproof disc; 5. Shaft. Detailed Implementation

[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0036] As shown in Figure 1, this utility model provides a composite dynamic shaft seal structure including: a labyrinth oil seal 1, a bearing cap 2, a lip seal 3, a dustproof disc 4, and a shaft 5; the labyrinth oil seal 1 is fitted onto the shaft 5 after cooperating with the bearing cap 2; the lip seal 3 is fixed onto the shaft 5 by the dustproof disc 4; the lip seal 3 cooperates with the cross-section of the labyrinth oil seal 1 under a certain contact pressure; the combination of the oil seal 1, the lip seal 3, and the dustproof disc 4 improves the reliability of the shaft seal.

[0037] As shown in Figure 1, the labyrinth oil seal 1 is composed of multiple alternating ring teeth and grooves, which increases the length and complexity of the leakage path.

[0038] As shown in Figure 1, the labyrinth oil seal 1 has an external water return groove to prevent external water accumulation.

[0039] As shown in Figure 3, the lip seal 3 disengages due to centrifugal force during rotation, thus preventing wear.

[0040] As shown in Figure 2, the lip seal 3 contacts the oil seal section when the vehicle is stopped, preventing external impurities from entering.

[0041] As shown in Figure 1, the dustproof disc 4 is located outside the lip seal 3 to block the splashing of external flushing fluid and rainwater.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite dynamic shaft seal structure, characterized in that: The composite dynamic shaft seal structure includes: a labyrinth oil seal (1), a bearing cap (2), a lip seal (3), a dust cover (4), and a shaft (5); the labyrinth oil seal (1) is fitted onto the shaft (5) after being fitted with the bearing cap (2); the lip seal (3) is fixed onto the shaft (5) by the dust cover (4); the lip seal (3) fits into the cross section of the labyrinth oil seal (1) under a certain contact pressure; the combination of the labyrinth oil seal (1), the lip seal (3), and the dust cover (4) improves the reliability of the shaft seal.

2. The composite dynamic shaft seal structure according to claim 1, characterized in that: The labyrinth oil seal (1) consists of multiple alternating ring teeth and grooves, which increases the length and complexity of the leakage path.

3. The composite dynamic shaft seal structure according to claim 1, characterized in that: The labyrinth oil seal (1) is provided with an external water return groove to prevent external water accumulation.

4. The composite dynamic shaft seal structure according to claim 1, characterized in that: During rotation, the lip seal (3) is disengaged due to centrifugal force, preventing wear; when the machine stops, the lip seal (3) comes into contact with the oil seal section to prevent external impurities from entering.

5. The composite dynamic shaft seal structure according to claim 1, characterized in that: The dustproof disc (4) is located outside the lip seal (3) to block the splashing of external flushing liquid and rainwater.

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