A sealing structure
By designing a multi-gradient sealing system and a multi-stage sealing structure for high-pressure oil seals, the problem of easy failure of sealing structures in furfural production was solved, achieving a high-efficiency sealing effect and improving the safety and efficiency of chemical production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENJIANG CHANGDA MASCH CO LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-07-21
AI Technical Summary
Existing sealing structures are prone to failure during furfural production, leading to aldehyde gas leakage, posing safety hazards and environmental pollution. Furthermore, they cannot effectively meet the operating conditions of medium-high temperature, medium-high pressure, and dusty and corrosive acid and alkali environments.
A multi-gradient sealing system was designed, including an oil seal seat assembly, a bearing seat, and a gland assembly. The system achieves efficient sealing by ensuring that the oil pressure is greater than the gas pressure inside the vessel. The sealing structure is constructed using high-pressure oil seals and multi-stage sealing rings to prevent gas leakage and impurity intrusion.
It improves the stability and safety of the sealing structure, reduces aldehyde gas leakage, and enhances the safety and efficiency of chemical production.
Smart Images
Figure CN224533467U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure vessel sealing technology, specifically to a sealing structure. Background Technology
[0002] Currently, furfural manufacturers use a sulfuric acid catalytic method, stripping away the generated furfural. The entire process involves mixing corn cobs with dilute sulfuric acid and then adding them to a hydrolysis reactor. The reactor pressure is approximately 0.7-0.9 MPa, and the temperature is around 145℃-230℃. After approximately 2-4 hours of hydrolysis, aldehyde gas is generated. The reactor valve is opened to collect the aldehyde gas. Once the aldehyde gas has been collected, the reactor discharge valve is opened to discharge the furfural residue waste. In existing technologies, the stirring mechanism of the furfural hydrolysis reactor is usually installed at the bottom of the reactor for easy stirring of the bottom material. Given the high temperature and high pressure environment of the hydrolysis reactor, the sealing of the connection between the stirring shaft and the bottom of the reactor is crucial.
[0003] Existing sealing structures can be broadly categorized into two types: contact seals and non-contact seals. Contact seals include packing seals, piston seals, and mechanical seals, while non-contact seals include labyrinth seals and gap seals. These sealing structures have various limitations in terms of operating conditions, equipment drive shaft stability, sealing pressure, and sealing status, making them unsuitable for the sealing requirements of furfural production. Furthermore, existing sealing structures often fail after prolonged use, allowing the generated furfural gas to leak into the atmosphere, causing safety issues and environmental pollution. Utility Model Content
[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a sealing structure that solves the sealing problem between the external drive shaft and the pressure vessel under high torque, low speed and poor working conditions (such as medium and high temperature, medium and high pressure, and sealing gas containing dust, corrosive acids and alkalis) in the prior art. It also solves the problem that the sealing structure of the hydrolysis reactor in the furfural production process is prone to failure in the prior art.
[0005] To achieve the above and other objectives, this utility model is implemented through the following technical solution: This utility model provides a sealing structure having a drive shaft, the sealing structure including a sealing assembly, the drive shaft passing through the sealing assembly, the sealing assembly including:
[0006] The bearing housing has a cavity;
[0007] An oil seal seat assembly, one end of which is connected to one end of the bearing seat, the oil seal seat assembly includes an oil seal seat body, a first sealing ring and a first oil seal component, the first sealing ring and the first oil seal component being disposed between the drive shaft and the oil seal seat body;
[0008] A first retaining ring is disposed in the cavity and is connected to the other end of the oil seal seat assembly;
[0009] A first bearing is disposed in the cavity and located on the side close to the first retaining ring, and the first bearing is sleeved on the drive shaft;
[0010] A gland assembly, one end of which is connected to the other end of the bearing housing, the gland assembly including a gland body, a second sealing ring and a second oil seal, the second sealing ring and the second oil seal being disposed between the drive shaft and the gland body;
[0011] The second bearing is disposed in the cavity and near the gland assembly, and the second bearing is sleeved on the drive shaft;
[0012] And a second retaining ring, one end of which is connected to the other end of the pressure cap assembly.
[0013] In one embodiment, the other end of the oil seal assembly is connected to a base, and a sealing gasket is provided between the base and the bearing housing.
[0014] In one embodiment, the oil seal body covers one open end of the cavity, and the gland body covers the other open end of the cavity.
[0015] In one embodiment, one end of the oil seal seat body is clamped between the bearing seat and the base, and the other end of the oil seal seat body is at least partially disposed in the cavity.
[0016] In one embodiment, the inner side of the oil seal seat body has a first cavity and a second cavity that communicate with each other, the first sealing ring is located in the first cavity, and the first oil seal is located in the second cavity.
[0017] In one embodiment, the inner wall of the bearing housing has a first stepped surface and a second stepped surface, the outer wall of the transmission shaft has a limiting ring and a limiting surface, one side of the first bearing is abutted against the first stepped surface and the first bearing is sleeved on the limiting ring, one side of the second bearing is abutted against the second stepped surface and the second bearing is sleeved on the limiting surface.
[0018] In one embodiment, the gland assembly further includes a support ring connected to one side of the gland body, the support ring being located in the cavity.
[0019] In one embodiment, the inner side of the gland body has a communicating third cavity and a fourth cavity, the second sealing ring is located in the third cavity, and the second oil seal is located in the fourth cavity.
[0020] In one embodiment, the outer diameter of the first retaining ring is larger than the diameter of the second cavity segment, and the outer diameter of the second retaining ring is larger than the diameter of the fourth cavity segment.
[0021] In one embodiment, the bearing housing sidewall has an oil inlet and an oil outlet communicating with the cavity.
[0022] This invention provides a sealing structure. Compared with the prior art, this invention has the following advantages: by setting a multi-gradient sealing system and setting the oil pressure to be greater than the gas pressure inside the reactor to achieve efficient sealing, it solves the problem of easy failure of traditional sealing structures, improves the safety of chemical production, and increases production efficiency. Attached Figure Description
[0023] Figure 1 The image shown is a cross-sectional view of the sealing structure of this utility model.
[0024] Figure 2 The image shown is a cross-sectional view of the oil seal seat body in one embodiment of this utility model.
[0025] Figure 3 The image shown is a cross-sectional view of a bearing housing according to an embodiment of the present invention.
[0026] Figure 4 The image shown is a cross-sectional view of the pressure cap body in one embodiment of this utility model.
[0027] Figure 5 The diagram shown is a structural schematic of the transmission shaft in one embodiment of this utility model.
[0028] Figure label:
[0029] 1-Base;
[0030] 2-Oil seal seat assembly, 21-Oil seal seat body, 211-First cavity section, 212-Second cavity section, 22-First sealing ring, 23-First oil seal component;
[0031] 3-First retaining ring;
[0032] 4-Bearing housing, 41-First stepped surface, 42-Second stepped surface, 43-Oil inlet, 44-Oil outlet;
[0033] 5-First bearing;
[0034] 6-Second bearing;
[0035] 7-Gland assembly, 71-Gland body, 72-Support ring, 711-Third cavity section, 712-Fourth cavity section, 73-Second sealing ring, 74-Second oil seal;
[0036] 8 - Second stop ring;
[0037] 9-Sealing gasket;
[0038] 100-Drive shaft, 101-Limiting ring, 102-Limiting surface, 200-Cessel body, 201-Mounting slot. Detailed Implementation
[0039] Please see Figures 1 to 5 The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0040] like Figure 1 As shown, this utility model provides a sealing structure. In some embodiments, the sealing structure can be used for sealing in a pressure vessel, which is a reaction vessel, specifically a hydrolysis vessel. The pressure vessel sealing structure can be used for sealing the connection between the pressure vessel and the external drive shaft 100, but it is not limited to this. For example, it can also be used for sealing the drive shaft in other pressure conveying mechanisms. That is, the sealing mechanism can be set in a vertical direction or a horizontal direction. The sealing structure is an oil seal. The following embodiment uses a sealing structure set at the bottom of a hydrolysis vessel as an example. The bottom of the hydrolysis vessel can have a discharge port separately provided on one side of the sealing structure.
[0041] like Figure 1 As shown, the sealing structure includes a drive shaft 100, which can drive the stirring paddle inside the pressure vessel to rotate. The sealing structure also includes a sealing assembly, which has a cavity through which the drive shaft 100 passes.
[0042] like Figure 1 As shown, the pressure vessel sealing assembly includes a base 1, which can be connected to the mounting slot 201 at the bottom of the vessel body 200 of the pressure vessel. One end of the base 1 can be inserted into the mounting slot 201 at the bottom of the vessel body 200.
[0043] like Figure 1 As shown, the sealing assembly includes an oil seal seat assembly 2, which includes an oil seal seat body 21. The outer diameter of the oil seal seat body 21 can be smaller than the outer diameter of the base 1, and one end of the oil seal seat body 21 can be connected to the bottom of the base 1.
[0044] like Figure 2As shown, one end of the oil seal seat body 21 is clamped to the bottom of the base 1. The cavity of the oil seal seat body 21 is a variable diameter cavity, which includes a first cavity section 211 and a second cavity section 212 that are coaxially connected. The diameter of the first cavity section 211 is smaller than the diameter of the second cavity section 212. A first sealing ring 22 is provided between the side wall of the first cavity section 211 and the drive shaft 100. The first sealing ring 22 can be a Glyd ring, and the number of the first sealing rings 22 is at least two.
[0045] like Figure 1 As shown, a first oil seal 23 can be provided in the space between the second cavity 212 and the drive shaft 100, forming a multi-stage sealing system with the first sealing ring 22 to prevent gas leakage. The first oil seal 23 may include multiple first oil seals 23. The oil seal described in this utility model is a high-pressure oil seal, such as a high-pressure rotary oil seal, a standard seal for rotating shafts, mainly used to prevent oil leakage and the intrusion of external impurities, suitable for high-pressure, high-speed, or high-temperature operating conditions. It is usually made of a metal skeleton and an elastic layer (such as nitrile rubber, fluororubber, etc.) vulcanized, and some have self-dustproof capability or double-lip design to enhance sealing performance.
[0046] like Figure 1 As shown, the sealing assembly includes a first retaining ring 3, which can be disposed at the bottom of the oil seal seat body 21. The outer diameter of the first retaining ring 3 is larger than the diameter of the second cavity section 212, and the first retaining ring 3 is located at the bottom of the second cavity section 212.
[0047] like Figure 1 As shown, the sealing assembly includes a bearing seat 4, which together with the base 1 clamps the top of the oil seal seat body 21. The base 1 and the bearing seat 4 can be fixed by bolts, and the bottom of the oil seal seat body 21 can be at least partially located in the cavity of the bearing seat 4.
[0048] like Figure 1 and Figure 3 As shown, the top sidewall of the bearing housing 4 has an oil inlet 43 that communicates with the cavity of the bearing housing 4. In some embodiments, the oil inlet 43 and the oil outlet 44 are located between the first bearing 5 and the second bearing 6. The bottom of the bearing housing 4 has an oil outlet 44 that communicates with the cavity of the bearing housing 4. An oil storage cavity is formed between the bearing housing 4 and the drive shaft 100.
[0049] like Figure 1As shown, the sealing assembly includes a first bearing 5 and a second bearing 6, which are disposed in the cavity of the bearing seat 4. The first bearing 5 is located below the first retaining ring 3, and the second bearing 6 is located at the bottom of the cavity of the bearing seat 4.
[0050] like Figure 1 As shown, the sealing assembly includes a gland assembly 7, which is disposed at the bottom of the bearing seat 4 and the second bearing 6. The gland assembly 7 includes a gland body 71 and a support ring 72. The gland body 71 and the bottom of the bearing seat 4 can be fixed by bolts, and the support ring 72 is disposed in the cavity of the bearing seat 4.
[0051] like Figure 4 As shown, similar to the oil seal seat body 21, the gland body 71 includes a third cavity section 711 and a fourth cavity section 712 that are coaxially connected. The diameter of the third cavity section 711 is smaller than the diameter of the fourth cavity section 712. A second sealing ring 73 is provided between the side wall of the third cavity section 711 and the drive shaft 100.
[0052] like Figure 1 and Figure 4 As shown, a second oil seal 74 can be provided in the space between the fourth cavity 712 and the drive shaft 100, and a second sealing ring 73 can be used to form a multi-level sealing system to prevent gas leakage and block the entry of dust and other gases.
[0053] In some embodiments, the pressure cap body 71 is provided with a support ring 72 on one end face near the second bearing 6, and the second bearing 6 may be located on the support ring 72.
[0054] like Figure 5 As shown, in some embodiments, the drive shaft 100 can be a variable diameter drive shaft 100, used to stabilize and limit the first bearing 5 and the second bearing 6. The outer wall of the drive shaft 100 has a limiting ring 101 and a limiting surface 102. The first bearing 5 can be sleeved on the limiting ring 101, and the second bearing 6 can be provided on the limiting surface 102.
[0055] like Figure 3As shown, the cavity within the bearing housing 4 is further provided with a stepped surface, which includes a first stepped surface 41 and a second stepped surface 42. The diameter of the first stepped surface 41 at the cavity location is smaller than the diameter of the second stepped surface 42 at the cavity location. The first stepped surface 41 is located above the second stepped surface 42. The first stepped surface 41 abuts against the top of the first bearing 5, the second stepped surface 42 abuts against the top of the second bearing 6, and the bottom of the second bearing 6 abuts against the support ring 72. The cooperation of the limiting ring, the limiting surface, and the stepped surface ensures the stability of the bearing in the sealing structure.
[0056] like Figure 1 As shown, the sealing assembly includes a second retaining ring 8, which is disposed at the bottom of the gland assembly 7. The second retaining ring 8 can be fixed to the gland body 71 by bolts. The second retaining ring 8 serves to prevent dust accumulation.
[0057] The base 1, oil seal seat body 21, bearing seat 4 and pressure cover body 71 are provided with connection holes for connection. The connection can be made by bolt and nut connection, which is the prior art and will not be described in detail here.
[0058] like Figure 1 As shown, in some embodiments, a sealing gasket 9 is provided between the base 1 and the bearing seat 4. The sealing gasket 9 can be provided on the periphery of the oil seal seat body 21. The base 1 and the bearing seat 4 are connected by bolts to form an axial compressive force, which, together with the sealing gasket 9, can enhance the sealing performance.
[0059] When this utility model is in operation, after the two ends of the bearing seat 4 are sealed by the oil seal seat body 21 and the pressure cap body 71, the sealing oil with a certain pressure is delivered to the oil inlet 43 of the bearing seat 4 by the electric pump station through the oil pipe. The sealing oil fills the oil storage chamber inside the bearing seat 4. When the oil pressure reaches a level that exceeds the gas pressure inside the reactor, pressure is maintained. When the oil pressure is greater than the gas pressure inside the reactor, the gas inside the reactor can be well sealed.
[0060] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A sealing structure having a drive shaft, characterized in that: The sealing structure includes a sealing assembly, through which the drive shaft passes. The sealing assembly includes: The bearing housing has a cavity; An oil seal seat assembly, one end of which is connected to one end of the bearing seat, the oil seal seat assembly includes an oil seal seat body, a first sealing ring and a first oil seal component, the first sealing ring and the first oil seal component being disposed between the drive shaft and the oil seal seat body; A first retaining ring is disposed in the cavity and is connected to the other end of the oil seal seat assembly; A first bearing is disposed in the cavity and located on the side close to the first retaining ring, and the first bearing is sleeved on the drive shaft; A gland assembly, one end of which is connected to the other end of the bearing housing, the gland assembly including a gland body, a second sealing ring and a second oil seal, the second sealing ring and the second oil seal being disposed between the drive shaft and the gland body; The second bearing is disposed in the cavity and near the gland assembly, and the second bearing is sleeved on the drive shaft; And a second retaining ring, one end of which is connected to the other end of the pressure cap assembly.
2. The sealing structure according to claim 1, characterized in that: The other end of the oil seal seat assembly is connected to a base, and a sealing gasket is provided between the base and the bearing seat.
3. The sealing structure according to claim 1, characterized in that: The oil seal body covers one opening end of the cavity, and the gland body covers the other opening end of the cavity.
4. The sealing structure according to claim 2, characterized in that: One end of the oil seal seat body is clamped between the bearing seat and the base, and the other end of the oil seal seat body is at least partially disposed in the cavity.
5. The sealing structure according to claim 1, characterized in that: The inner side of the oil seal seat body has a first cavity and a second cavity that are connected. The first sealing ring is located in the first cavity, and the first oil seal is located in the second cavity.
6. The sealing structure according to claim 1, characterized in that: The inner wall of the bearing housing has a first stepped surface and a second stepped surface, and the outer wall of the transmission shaft has a limiting ring and a limiting surface. One side of the first bearing is attached to the first stepped surface and is sleeved on the limiting ring. One side of the second bearing is attached to the second stepped surface and is sleeved on the limiting surface.
7. The sealing structure according to claim 1, characterized in that: The cap assembly also includes a support ring connected to one side of the cap body, the support ring being located in the cavity.
8. The sealing structure according to claim 5, characterized in that: The inner side of the gland body has a third cavity and a fourth cavity that are connected. The second sealing ring is located in the third cavity, and the second oil seal is located in the fourth cavity.
9. The sealing structure according to claim 8, characterized in that: The outer diameter of the first retaining ring is larger than the diameter of the second cavity segment, and the outer diameter of the second retaining ring is larger than the diameter of the fourth cavity segment.
10. The sealing structure according to claim 1, characterized in that: The bearing housing has an oil inlet and an oil outlet on its side wall that communicate with the cavity.