Shaft seal structure and centrifugal machine

Abstract

The utility model provides a shaft seal structure and a centrifugal machine, and relates to the technical field of material processing. The shaft seal structure comprises a main shaft, a framework seal structure and a labyrinth seal structure, the main shaft penetrates through a material chamber and a bearing chamber, and the main shaft rotates relative to the material chamber; the framework sealing structure is arranged outside the main shaft and between the material chamber and the bearing chamber; the main shaft is sleeved with the labyrinth sealing structure which is arranged between the material chamber and the bearing chamber. The labyrinth sealing structure abuts against the framework sealing structure and is arranged outside the framework sealing structure in a sleeving mode. The framework sealing structure and the labyrinth sealing structure are arranged in the radial direction of the main shaft and are limited by the original axial space, the two sealing structures do not occupy the space in the axial direction of the main shaft, space arrangement is facilitated, and the improvement cost is low. The double sealing effect of main sealing and auxiliary sealing can be achieved at the same shaft sealing position of the main shaft, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of material processing, and in particular to a shaft sealing structure and a centrifuge. Background Art

[0002] Existing equipment typically uses labyrinth seals, which provide a certain degree of sealing effectiveness when the equipment is operating. However, when the equipment is stopped, corrosive gases from the material chamber, such as acidic and alkaline gases, can enter the bearing chamber, severely corroding carbon steel materials such as bearings and differentials. The resulting solid particles are easily detached, significantly reducing the service life of components such as bearings and differentials and increasing equipment maintenance costs.

[0003] In addition, the original labyrinth seal cannot prevent the grease in the bearing chamber from entering the material chamber, causing grease to mix into the material and affecting the material processing quality. Utility Model Content

[0004] The shaft sealing structure and centrifuge provided by the utility model can improve the sealing performance.

[0005] According to a first aspect of the present invention, a shaft sealing structure is provided, comprising:

[0006] A main shaft is provided through the material chamber and the bearing chamber, and the main shaft rotates relative to the material chamber;

[0007] A skeleton sealing structure is sleeved on the outside of the main shaft and arranged between the material chamber and the bearing chamber;

[0008] A labyrinth seal structure, sleeved on the outside of the main shaft and arranged between the material chamber and the bearing chamber;

[0009] Wherein, the labyrinth sealing structure abuts against the skeleton sealing structure and is sleeved on the outside of the skeleton sealing structure.

[0010] In some embodiments, the labyrinth seal structure comprises:

[0011] A dynamic seal is provided on a side of the material chamber facing the bearing chamber;

[0012] A static seal is provided on a side of the bearing chamber facing the material chamber, and the static seal and the dynamic seal cooperate with each other to form a labyrinth seal chamber.

[0013] In some embodiments, the invention further comprises:

[0014] A leakage outlet structure is provided in at least one of the material chamber and the bearing chamber, and the leakage outlet structure is communicated with the labyrinth seal chamber.

[0015] In some embodiments, the leakage extraction structure includes:

[0016] a flow channel running through the material chamber and / or the bearing chamber, wherein an inlet is provided at one end of the flow channel close to the labyrinth seal chamber, and the inlet is communicated with the labyrinth seal chamber;

[0017] Wherein, the inlet of the flow channel is extended along the axial direction of the main shaft.

[0018] In some embodiments, the leakage outlet structure further comprises:

[0019] A drainage detection tube is arranged outside the material chamber and / or the bearing chamber, and the drainage detection tube is communicated with an end of the flow channel away from the inlet.

[0020] In some embodiments, the invention further comprises:

[0021] A guide structure is provided along the radial direction of the main shaft on a side of the labyrinth sealing chamber away from the main shaft and between the material chamber or the bearing chamber, and is used to guide the lubricating oil in the labyrinth sealing chamber.

[0022] In some embodiments, the invention further comprises:

[0023] A blocking member is sleeved on the outside of the main shaft, and the blocking member is arranged between the material chamber and the labyrinth sealing structure; and / or the blocking member is arranged between the bearing chamber and the labyrinth sealing structure.

[0024] In some embodiments, the invention further comprises:

[0025] A limiting member is sleeved on the outside of the main shaft and is arranged at at least one end of the skeleton sealing structure along the axial direction of the main shaft, and is used to limit the skeleton sealing structure.

[0026] In some embodiments, the invention further comprises:

[0027] An adjusting member is sleeved on the main shaft, and the adjusting member is arranged between the main shaft and the material chamber or between the main shaft and the bearing chamber.

[0028] According to the second aspect of the present invention, an embodiment of the present invention further provides a centrifuge, comprising a material chamber, a bearing chamber and the above-mentioned shaft sealing structure, wherein the main shaft of the shaft sealing structure passes through the material chamber and the bearing chamber, and the main shaft rotates relative to the material chamber.

[0029] An embodiment of the present invention has the following advantages or beneficial effects:

[0030] The shaft seal structure and centrifuge provided in this embodiment form a double-layer sealing result through the mutual cooperation of the skeleton sealing structure and the labyrinth sealing structure, thereby improving the sealing performance, extending the maintenance and use cycle, and reducing production costs.

[0031] Furthermore, the skeleton seal and labyrinth seal are arranged radially rather than axially along the main shaft. Due to existing axial space constraints, the two seals do not occupy axial space, facilitating layout and reducing modification costs. Furthermore, dual sealing effects, both primary and secondary, can be achieved at the same shaft sealing location on the main shaft, further improving sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To better understand the present invention, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present invention. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each figure. The above and other features and advantages of the present invention will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings.

[0033] in:

[0034] Figure 1 Shown is a schematic structural diagram of a centrifuge according to an embodiment of the present invention;

[0035] Figure 2 Shown is Figure 1 A local enlarged view at point A;

[0036] Figure 3 Shown is Figure 2 A partial enlarged view at point B;

[0037] Figure 4 The figure shows a schematic structural diagram of a shaft seal structure display guide structure according to an embodiment of the present invention;

[0038] Figure 5 The figure shows a schematic structural diagram of an existing shaft seal structure without a guide structure.

[0039] The description of the accompanying drawings is as follows:

[0040] 100, material chamber; 101, drum; 200, bearing chamber; 201, bearing end cover; 202, bearing seat; 203, bearing;

[0041] 1. Main shaft; 2. Skeleton sealing structure; 3. Labyrinth sealing structure; 4. Leakage outlet structure; 5. Guide structure; 6. Blocking member; 7. Limiting member; 8. Adjusting member;

[0042] 21. Support member; 211. First support portion; 212. Second support portion; 213. Third support portion; 214. Fourth support portion; 215. Spring ring;

[0043] 31. Static seal; 32. Dynamic seal;

[0044] 41. Flow channel; 42. Drainage detection tube. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the exemplary embodiments of the present invention to clearly and completely describe the technical solutions in the exemplary embodiments of the present invention. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present invention.

[0046] In the description of the present invention, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0047] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0048] Furthermore, in the description of the present invention, it should be understood that the directional words such as "upper", "lower", "inside", and "outside" described in the exemplary embodiments of the present invention are described based on the angles shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present invention. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inside", "outside", it can not only be directly connected to the other (one or more) elements "upper", "lower", or "inside", "outside", but can also be indirectly connected to the other (one or more) elements "upper", "lower", "inside", "outside" through an intermediate element.

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0050] This embodiment provides a centrifuge, such as Figure 1 As shown, the centrifuge includes a material chamber 100 , a bearing chamber 200 and a shaft sealing structure. The main shaft 1 of the shaft sealing structure passes through the material chamber 100 and the bearing chamber 200 , and the main shaft 1 rotates relative to the material chamber 100 .

[0051] The bearing housing 200 includes a bearing seat 202 and a bearing 203. The bearing seat 202 is used to mount the outer ring of the bearing 203. The inner ring of the bearing 203 is sleeved on the outside of the main shaft 1. The bearing 203 enables the free rotation of the main shaft 1. An oil inlet hole (not shown) is provided at the end of the main shaft 1. An oil delivery channel (not shown) is provided within the main shaft 1. One end of the oil delivery channel is connected to the oil inlet hole, and the other end is corresponding to the bearing 203. Under the action of pressure, lubricating oil flowing out of the oil inlet hole is transported through the oil delivery channel to the bearing 203, thereby providing lubricating oil for the bearing 203.

[0052] The material chamber 100 includes a drum 101 , the inner cavity of the drum 101 is used to accommodate the material. The drum 101 can rotate synchronously with the main shaft 1 to achieve the function of solid-liquid centrifugal separation of the material, thereby improving the material drying effect.

[0053] The material chamber 100 also includes a peripheral chamber, which is located outside the drum 101. The suspension (or emulsion) enters the drum 101 through a feed pipe arranged at the center of the drum 101. Under the action of centrifugal force, the particles are deposited inside the drum 101, and the liquid is discharged into the peripheral chamber outside the drum 101.

[0054] During the separation process in material chamber 100, corrosive gases such as acidic and alkaline gases may be generated. If these gases enter bearing chamber 200, they can corrode components such as bearings and differentials. The resulting solid particles can easily break away, reducing the service life of bearing 203 and increasing equipment maintenance costs. Furthermore, lubricating oil may flow from bearing chamber 200 into material chamber 100, causing contamination and impacting the material's reaction performance.

[0055] In order to solve this problem, this embodiment provides a shaft sealing structure, such as Figure 1-Figure 2As shown, the shaft sealing structure includes a main shaft 1, a skeleton sealing structure 2 and a labyrinth sealing structure 3. The main shaft 1 is inserted into the material chamber 100 and the bearing chamber 200, and the material chamber 100 rotates relative to the main shaft 1; the skeleton sealing structure 2 is sleeved on the outside of the main shaft 1 and is arranged between the material chamber 100 and the bearing chamber 200; the labyrinth sealing structure 3 is sleeved on the outside of the main shaft 1 and is arranged between the material chamber 100 and the bearing chamber 200.

[0056] The skeleton seal structure 2 can be made of a rubber material, such as fluororubber. The skeleton seal structure 2 offers greater sealing reliability than the labyrinth seal structure 3 and a longer service life. Serving as the primary seal for the lubricating oil in the bearing chamber 200, the skeleton seal structure 2 provides a more reliable seal. When the centrifuge is stationary, this reduces the risk of corrosive gases, such as acidic and alkaline gases, entering the bearing chamber 200 and corroding components such as the bearing 203, ensuring a leak-free seal for the lubricating oil and minimizing the risk of material contamination.

[0057] Among them, the labyrinth sealing structure 3 serves as the second seal for the lubricating oil in the bearing chamber 200. If the skeleton sealing structure 2 fails, the labyrinth sealing structure 3 will prevent the lubricating oil in the bearing chamber 200 from leaking to the material chamber 100, reducing the risk of material contamination, playing the role of auxiliary sealing, and extending the service life of the shaft sealing structure.

[0058] The shaft sealing structure provided in this embodiment forms a double-layer sealing result through the mutual cooperation of the skeleton sealing structure 2 and the labyrinth sealing structure 3, thereby improving the sealing performance, extending the maintenance and use cycle, and reducing the production cost.

[0059] The labyrinth sealing structure 3 abuts against the skeleton sealing structure 2 and is sleeved on the outside of the skeleton sealing structure 2 .

[0060] In this approach, the skeleton seal structure 2 and the labyrinth seal structure 3 are arranged radially rather than axially along the main shaft 1. Due to the existing axial space constraints, the two seal structures do not occupy the axial space of the main shaft 1, facilitating spatial layout and reducing modification costs. Furthermore, dual sealing effects, both primary and auxiliary, can be achieved at the same shaft sealing position on the main shaft 1, further improving sealing performance.

[0061] In one embodiment, the skeleton sealing structure 2 includes a bracket and a covering. The bracket is mounted on the exterior of the main shaft 1, and the covering is wrapped around the exterior of the bracket. The bracket provides support, while the covering provides protection. The bracket is made of metal, providing good support stability and effectiveness. The covering is made of rubber, which has a certain degree of elasticity, ensuring reliable contact between the skeleton sealing structure 2, the main shaft 1, and the bearing end cap 201.

[0062] Among them, such as Figure 2-Figure 3 As shown, the bracket includes two oppositely arranged support members 21, wherein one support member 21 is arranged toward the material chamber 100, and the other support member 21 is arranged toward the bearing chamber 200, and the two support members 21 are connected in a back-to-back direction.

[0063] Specifically, the support member 21 includes a first support portion 211, a second support portion 212, a third support portion 213, and a fourth support portion 214. The first support portion 211 is sleeved on the exterior of the main shaft 11 and abuts the labyrinth seal structure 33. The second support portion 212 is connected to the first support portion 211 at one end and to the third support portion 213 at the other end. The first support portion 211 and the second support portion 212 are arranged at an angle. For example, the first support portion 211 and the second support portion 212 are arranged perpendicularly, that is, the angle between the first support portion 211 and the second support portion 212 is 90°. The second support portion 212 and the third support portion 213 are arranged at an angle. For example, the angle between the second support portion 212 and the third support portion 213 is specifically an obtuse angle. The fourth support portion 214 is connected to the end of the third support portion 213 away from the second support portion 212. The connection between the third support portion 213 and the fourth support portion 214 abuts the main shaft 11. The third support portion 213 and the fourth support portion 214 are arranged at an angle to each other, forming a first V-shaped groove, the opening of which faces the labyrinth seal structure 3. The first V-shaped groove is used to accommodate the spring coil 215, and the elastic force of the spring coil 215 enhances the fixing effect between the support member 21 and the main shaft 11. In addition, a second V-shaped groove is formed between the third support portions 213 of the two support members 21, with the opening of the second V-shaped groove facing the main shaft 11. When the first support portion 211 and the labyrinth seal structure 33 come into contact, the second V-shaped groove provides a certain elastic space, facilitating the installation of the support member 21 between the main shaft 11 and the labyrinth seal structure 33.

[0064] In one embodiment, Figure 1-Figure 2 As shown, the labyrinth seal structure 3 includes a dynamic seal 32 and a static seal 31. The dynamic seal 32 is arranged on the side of the material chamber 100 facing the bearing chamber 200. The static seal 31 is arranged on the side of the bearing chamber 200 facing the material chamber 100. The static seal 31 and the bearing chamber 200 can be a split structure or an integrated structure, and the dynamic seal 32 and the material chamber 100 can be a split structure or an integrated structure.

[0065] The static seal 31 and the dynamic seal 32 cooperate to form a labyrinth seal chamber. Specifically, one of the dynamic seal 32 and the static seal 31 is provided with a protrusion and the other with a groove. The protrusion inserts into the groove, with a gap between the protrusion and the groove. If there are multiple protrusions and grooves, and the multiple protrusions insert into the multiple grooves, the side of the dynamic seal 32 and the static seal 31 that approaches each other may have a corrugated structure or other structure that allows them to be embedded in each other.

[0066] Specifically, a labyrinth seal, also known as a comb seal, creates hydraulic friction and flow constriction through gaps in the medium, achieving both flow throttling and sealing. The labyrinth seal structure 3 can be embedded within the bearing end cap 201 and arranged radially on the outside of the bearing end cap 201.

[0067] If both the skeleton sealing structure 2 and the labyrinth sealing structure 3 fail, the leaked lubricating oil will continue to flow into the material chamber 100 and will not be easily discovered, resulting in serious material contamination. Figure 1-Figure 2 As shown, the shaft sealing structure further includes a leakage outlet structure 4 , which is provided in at least one of the material chamber 100 and the bearing chamber 200 , and is communicated with the labyrinth seal cavity.

[0068] Specifically, the leakage outlet structure 4 can be provided only in the material chamber 100, only in the bearing chamber 200, or in both the material chamber 100 and the bearing chamber 200. The leakage outlet structure 4 is connected to the labyrinth seal chamber. If the labyrinth seal structure 3, which serves as the second seal, also fails, the lubricating oil leaking from the labyrinth seal chamber can be discharged through the leakage outlet structure 4. This allows for timely detection of seal failure, facilitates subsequent equipment maintenance, and reduces the risk of material contamination.

[0069] Exemplarily, the leakage outlet structure 4 includes a flow channel 41, which runs through the material chamber 100 and / or the bearing chamber 200. An inlet is provided at one end of the flow channel 41 close to the labyrinth sealing cavity, and the inlet is connected to the labyrinth sealing cavity. The inlet of the flow channel 41 is used to receive the lubricating oil leaked from the labyrinth sealing cavity.

[0070] If the flow channel 41 passes through the material chamber 100, that is, the flow channel 41 passes through the side wall of the drum 101, the material in the material chamber 100 is not a closed structure, so the lubricating oil leaking from the labyrinth seal cavity enters the flow channel 41 through the inlet and is then discharged from the material chamber 100 through the side wall of the drum 101, thereby avoiding the situation where the lubricating oil contaminates the material chamber 100.

[0071] If the flow channel 41 passes through the bearing chamber 200, that is, the flow channel 41 passes through the bearing end cover 201 of the bearing chamber 200, the material in the bearing end cover 201 is not a closed structure, so that the lubricating oil leaking from the labyrinth seal chamber enters the flow channel 41 through the inlet and is then discharged from the bearing end cover 201 to the outside of the bearing chamber 200, thereby avoiding the situation where the lubricating oil contaminates the material chamber 100.

[0072] The inlet of the flow channel 41 is extended along the axial direction of the main shaft 1 .

[0073] In this way, according to the rotation direction of the drum 101, the inlet of the flow channel 41 is led out tangentially, which facilitates the leakage of lubricating oil to the inlet of the flow channel 41, allowing users to promptly detect leakage due to seal failure, thereby improving the timeliness and effectiveness of detection.

[0074] In one embodiment, Figure 1-Figure 2 As shown, leakage discharge structure 4 further includes a drainage detection tube 42, which can be a flexible hose. Drainage detection tube 42 is disposed outside material chamber 100 and / or bearing chamber 200 and communicates with the end of flow channel 41 away from the inlet. Drainage detection tube 42 allows leaked lubricating oil to be discharged outside flow channel 41, reducing the risk of leaked lubricating oil contaminating material chamber 100 and facilitating the collection and recycling of the leaked lubricating oil.

[0075] When the shaft seal structure leaks, part of the lubricating oil may flow through the drum 101 into the interior of the material chamber 100, causing material contamination. Figure 1-Figure 2 As shown, the shaft sealing structure of the present application also includes a guide structure 5. Along the radial direction of the main shaft 1, the guide structure 5 is arranged on the side of the labyrinth sealing chamber away from the main shaft 1 and is arranged between the material chamber 100 or the bearing chamber 200. The guide structure 5 is used to guide the lubricating oil in the labyrinth sealing chamber.

[0076] That is, at the end of the labyrinth sealing chamber, the leaked lubricating oil is drained through the guide structure 5, which guides and plans the flow direction of the lubricating oil, facilitates the return and recovery of the lubricating oil, and reduces the risk of contact between the lubricating oil and the material.

[0077] Specifically, if Figure 2-Figure 5 As shown, the guide structure 5 includes a guide bevel. This bevel is positioned radially along the main shaft 1, between the outer side of the static seal 31, away from the main shaft 1, and the bearing end cap 201. The guide bevel is angled downward relative to the static seal 31, directing the lubricating oil through the bevel to the outer wall of the bearing end cap 201. In actual production, the guide bevel can be formed by obliquely cutting the portion of the static seal 31 at the end of the labyrinth seal cavity at the connection between the static seal 31 and the bearing end cap 201.

[0078] In one embodiment, Figure 1-Figure 2 As shown, the shaft sealing structure also includes a blocking member 6, which can also be called an oil retaining ring. The blocking member 6 is sleeved on the outside of the main shaft 1, and the blocking member 6 is arranged between the material chamber 100 and the labyrinth sealing structure 3; and / or, the blocking member 6 is arranged between the bearing chamber 200 and the labyrinth sealing structure 3.

[0079] The blocking member 6 serves to block the lubricating oil. Under the joint action of the guiding structure 5 and the blocking member 6, the lubricating oil is prevented from entering the material chamber.

[0080] In one embodiment, Figure 1-Figure 2 As shown, the shaft sealing structure also includes a limiter 7, which is sleeved on the outside of the main shaft 1. Along the axial direction of the main shaft 1, the limiter 7 is set at at least one end of the skeleton sealing structure 2 for limiting the skeleton sealing structure 2.

[0081] The limiting member 7 is used to achieve axial limiting of the skeleton sealing structure 2 , thereby preventing the skeleton sealing structure 2 from axially deviating and improving the installation accuracy of the skeleton sealing structure 2 .

[0082] For example, since the static seal 31 of the labyrinth sealing structure 3 is stationary relative to the main shaft 1, the limiter 7 can be set on the static seal 31 of the labyrinth sealing structure 3. The limiter 7 can be an annular protrusion set on the side of the static seal 31 facing the main shaft 1. The static seal 31 and the limiter 7 are an integrally molded structure, which reduces the parts assembly process and saves production costs.

[0083] In one embodiment, the shaft seal structure further includes an adjusting member 8, which can also be called a gasket. The adjusting member 8 is sleeved on the main shaft 1 and is arranged between the main shaft 1 and the material chamber 100 or between the main shaft 1 and the bearing chamber 200.

[0084] Exemplarily, the adjusting member 8 is arranged between the main shaft 1 and the material chamber 100, and is used to adjust the axial position between the main shaft 1 and the drum 101 of the material chamber 100; the adjusting member 8 is arranged between the main shaft 1 and the bearing chamber 200, and is used to adjust the axial position between the main shaft 1 and the bearing chamber 200.

[0085] The axial clearance of the labyrinth sealing structure 3 can also be adjusted by using the adjusting member 8 to avoid the labyrinth sealing effect being affected by a large axial clearance, or the occurrence of scratches between the dynamic seal 32 and the static seal 31 in relative motion due to a small axial clearance; in addition, it also prevents the failure of the skeleton sealing structure 2, which causes the lubricating oil to flow into the drum 101 along the axial direction of the main shaft 1, and to a certain extent, it also has a sealing effect.

[0086] It should be noted that the embodiments of the present invention are shown in the drawings and described in this specification is only an example of the principles of the present invention. It should be clear to those skilled in the art that the principles of the present invention are not limited to any details or any components of the devices shown in the drawings or described in the specification.

[0087] It should be understood that the present invention is not limited in its application to the detailed structure and arrangement of the components proposed in this specification. The present invention is capable of other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or the drawings. All of these different combinations constitute multiple alternative aspects of the present invention. The embodiments described in this specification illustrate the best known ways to implement the present invention and will enable those skilled in the art to utilize the present invention.

[0088] Other embodiments of the present invention will readily occur to those skilled in the art after considering this specification and practicing the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and example embodiments are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the appended claims.

[0089] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A shaft sealing structure, characterized in that: include: A main shaft is provided through the material chamber and the bearing chamber, and the main shaft rotates relative to the material chamber; A skeleton sealing structure, sleeved on the outside of the main shaft and arranged between the material chamber and the bearing chamber; A labyrinth seal structure, sleeved on the outside of the main shaft and arranged between the material chamber and the bearing chamber; Wherein, the labyrinth sealing structure abuts against the skeleton sealing structure and is sleeved on the outside of the skeleton sealing structure.

2. The shaft sealing structure according to claim 1, characterized in that: The labyrinth sealing structure comprises: A dynamic seal is arranged on a side of the material chamber facing the bearing chamber; A static seal is arranged on a side of the bearing chamber facing the material chamber, and the static seal and the dynamic seal cooperate with each other to form a labyrinth seal chamber.

3. The shaft sealing structure according to claim 2, characterized in that: Also includes: A leakage lead-out structure is arranged in at least one of the material chamber and the bearing chamber, and the leakage lead-out structure is communicated with the labyrinth seal chamber.

4. The shaft sealing structure according to claim 3, characterized in that: The leakage extraction structure comprises: A flow channel, which runs through the material chamber and / or the bearing chamber, wherein an inlet is provided at one end of the flow channel close to the labyrinth sealing chamber, and the inlet is communicated with the labyrinth sealing chamber; Wherein, the inlet of the flow channel is extended along the axial direction of the main shaft.

5. The shaft sealing structure according to claim 4, characterized in that: The leakage extraction structure further includes: A drainage detection tube is arranged outside the material chamber and / or the bearing chamber, and the drainage detection tube is communicated with an end of the flow channel away from the inlet.

6. The shaft sealing structure according to claim 2, characterized in that: Also includes: A guide structure is arranged along the radial direction of the main shaft on a side of the labyrinth sealing chamber away from the main shaft and between the material chamber or the bearing chamber, and the guide structure is used to guide the lubricating oil in the labyrinth sealing chamber.

7. The shaft sealing structure according to claim 6, characterized in that: Also includes: A blocking member, sleeved on the outside of the main shaft, and arranged between the material chamber and the labyrinth sealing structure; And / or, the blocking member is arranged between the bearing chamber and the labyrinth sealing structure.

8. The shaft sealing structure according to any one of claims 1 to 7, characterized in that: Also includes: A limiting member is sleeved on the outside of the main shaft. Along the axial direction of the main shaft, the limiting member is arranged at at least one end of the skeleton sealing structure and is used for limiting the position of the skeleton sealing structure.

9. The shaft sealing structure according to any one of claims 1 to 7, characterized in that: Also includes: An adjusting member is sleeved on the main shaft, and the adjusting member is arranged between the main shaft and the material chamber or between the main shaft and the bearing chamber.

10. A centrifuge, characterized in that: It comprises a material chamber, a bearing chamber and the shaft sealing structure according to any one of claims 1 to 9, wherein the main shaft of the shaft sealing structure passes through the material chamber and the bearing chamber, and the material chamber rotates relative to the main shaft.

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