Fan shaft seal device

Abstract

The utility model provides a fan shaft seal device. The fan shaft seal device comprises a fan shaft; the connecting cylinder is a cylinder, and the connecting cylinder is arranged on the fan shaft in a sleeving mode; the sealing structures are arranged at the two ends of the connecting cylinder; air sealing cavities are formed between the two sealing structures and between the connecting cylinder and the fan shaft; the connecting holes are formed in the connecting cylinder, the connecting holes are connected with the gas sealing cavity, and the connecting holes comprise the first connecting hole used for communicating with compressed nitrogen and the second connecting hole used for communicating with the gas sealing cavity; and the second connecting hole is used for being communicated with a drain valve. Compressed nitrogen is introduced through the first connecting hole in the upper end of the rotating shaft, and the problem of how to achieve the lubricating effect of the fan shaft when a food-grade fan is used is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft seal devices, and more specifically, to a fan shaft seal device. Background Art

[0002] With the development of technology, shaft seal devices are applied in more and more fields. The fan shaft seal device seals the position of the rotating shaft to prevent internal gas leakage. The fan shaft in the fan shaft seal device needs to be provided with lubricating oil during operation. However, during the use of food-grade fans, the lubricating oil in the fan shaft seal device may be affected under high temperature, low temperature or extreme working conditions; if the lubricating oil leaks, it will cause environmental pollution, increase the maintenance cost and labor intensity.

[0003] It can be seen that during the use of food-grade fans, the lubricating oil, as the lubricating part of the fan shaft in the fan shaft seal device, has the above-mentioned various inconvenient problems. Summary of the Utility Model

[0004] The problem solved by the utility model is how to solve the lubrication effect of the fan shaft when using a food-grade fan.

[0005] To solve the above problems, the utility model provides a fan shaft seal device, including: a fan shaft; a connecting cylinder, the connecting cylinder is a cylinder, and the connecting cylinder is sleeved on the fan shaft; a sealing structure, the sealing structure is arranged at both ends of the connecting cylinder; an air seal cavity is formed between the two sealing structures and between the connecting cylinder and the fan shaft; a connecting hole, the connecting hole is arranged on the connecting cylinder, and the connecting hole is connected to the air seal cavity, wherein the connecting hole includes: a first connecting hole for communicating compressed nitrogen; a second connecting hole for communicating a drain valve.

[0006] Compared with the prior art, the technical effects achieved by adopting this technical solution: the air seal cavity formed by the sealing structure, the connecting cylinder and the fan shaft is filled with compressed nitrogen through the first connecting hole. When the fan shaft rotates, a gas film is formed between the fan shaft and the sealing structure by the compressed nitrogen. This gas film can support the load and reduce direct contact, thereby reducing wear and friction. When the air seal cavity inside the fan shaft seal device needs to be cleaned, the second connecting hole is connected to the drain valve, and the sewage in the air seal cavity after cleaning flows out through the second connecting hole.

[0007] Further, the connecting cylinder includes: a cylinder sleeved on the fan shaft; a connecting flange arranged at both ends of the cylinder.

[0008] The technical effects achieved by adopting this technical solution: improve the radial stability of the fan shaft and prevent the fan shaft from loosening during operation.

[0009] Furthermore, the connecting flange surface is provided with a plurality of first through holes, and is connected to the sealing structure through fasteners in the first through holes.

[0010] The technical effect achieved after adopting this technical solution: The airtightness of the airtight cavity inside the fan shaft seal device is improved by connecting with fasteners, preventing internal gas leakage.

[0011] Furthermore, the connecting flange is embedded in the two end faces of the cylinder.

[0012] The technical effect achieved after adopting this technical solution: The stability of the internal airtight cavity is improved, preventing the connection structure of the airtight cavity from being misaligned during the operation of the fan shaft, resulting in internal gas leakage of the airtight cavity.

[0013] Furthermore, the outer diameter of the cylinder is smaller than the outer diameter of the connecting flange, and the first connecting hole and the second connecting hole are located between the two connecting flanges.

[0014] The technical effect achieved after adopting this technical solution: The internal airtight cavity is protected by the connecting flange, and the two connecting holes are located between the two connecting flanges, saving the internal space of the fan shaft seal device and facilitating the connection of compressed nitrogen and the drain valve.

[0015] Furthermore, radial protrusions are provided at both ends of the cylinder; the end face of the connecting flange is matched with the radial protrusions.

[0016] The technical effect achieved after adopting this technical solution: In order to fix the cylinder and the two connecting flanges and improve the stability of the connecting cylinder, this connection method is used to avoid gaps between the connection structures during the operation of the fan shaft, resulting in internal gas leakage, and facilitating installation.

[0017] Furthermore, axial protrusions are provided at both ends of the cylinder; the connecting flange is sleeved outside the axial protrusions.

[0018] The technical effect achieved after adopting this technical solution: Restrict the position of the connecting flange, ensure the stability of the internal space of the airtight cavity, and facilitate installation.

[0019] Furthermore, a groove is provided inside the connecting flange for cooperating with the axial protrusion.

[0020] The technical effect achieved after adopting this technical solution: The axial protrusion is embedded in the groove, improving the stability of the connecting flange and the cylinder, and avoiding loosening during the operation of the fan shaft.

[0021] Furthermore, the sealing structure includes: a sealing ring, the inner ring of the sealing ring is in contact with the fan shaft; a pressing flange, the pressing flange is provided on the end face of the sealing ring away from the cylinder.

[0022] Technical effects achieved after adopting this technical solution: The inner ring of the sealing ring moves relative to the fan shaft. At this time, the compressed nitrogen inside the gas sealing cavity forms a gas film on the two relatively moving structural surfaces, thereby reducing the contact and friction between the inner ring of the sealing ring and the fan shaft. The pressing flanges on both sides tightly connect the entire fan shaft sealing device to prevent leakage of the inner gas sealing cavity when the fan shaft is operating.

[0023] Furthermore, a plurality of second through holes are provided on the surface of the sealing ring; a plurality of third through holes are provided on the surface of the pressing flange; among them, the first through hole, the second through hole, and the third through hole are connected by fasteners.

[0024] Technical effects achieved after adopting this technical solution: The connecting cylinder inside the fan shaft seal and the sealing structure are connected by fasteners, and all structures are connected by one connection method, improving the stability of the internal structure of the fan shaft seal device, and ensuring that the compressed nitrogen in the internal gas sealing cavity plays a stable lubricating role when the fan shaft is operating.

[0025] In summary, each of the above technical solutions of this application may have one or more of the following advantages or beneficial effects:

[0026] i) The first connection hole is connected to compressed nitrogen. When used for a food-grade fan, compressed nitrogen replaces lubricating oil. When the fan shaft seal is operating, the compressed nitrogen in the gas sealing cavity is not easily leaked; nitrogen is an inert gas, not easily combustible and does not support combustion. Using nitrogen can significantly reduce the risks of fire and explosion, especially in working conditions where flammable, explosive or toxic gases are handled, improving the overall safety of the system; the nitrogen sealing system can more effectively isolate oxygen and moisture, reducing oxidation corrosion and wear, and helping to extend the service life of the fan and other related equipment. ii) When the gas sealing chamber needs to be cleaned, the second interface connection hole is connected to the drain valve, facilitating drainage of the gas sealing cavity. iii) All structures forming the gas sealing cavity are connected by the same type of fasteners, ensuring the stability between structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a fan shaft seal device according to an embodiment of the present invention;

[0028] Figure 2 is a radial cross-sectional view of the fan shaft seal device according to an embodiment of the present invention;

[0029] Figure 3 is an exploded view of the fan shaft seal device according to an embodiment of the present invention;

[0030] Figure 4 is a shaft seal cross-sectional view of the fan shaft seal device according to an embodiment of the present invention;

[0031] Figure 5Schematic diagram of the internal cylinder of the fan shaft seal device according to an embodiment of the present invention;

[0032] Figure 6 Axial sectional view of the fan shaft seal device according to an embodiment of the present invention;

[0033] Explanation of reference numerals:

[0034] 100 - Fan shaft device; 110 - Fan shaft; 120 - Connecting hole; 130 - Connecting cylinder; 140 - Sealing structure; 150 - Gas sealing cavity; 160 - Fastener; 121 - First connecting hole; 122 - Second connecting hole; 131 - Cylinder; 131a - Radial protrusion; 131b - Axial protrusion; 132 - Connecting flange; 141 - Sealing ring; 141b - Inner ring of the sealing ring; 142 - Compressing flange; 132a - First through hole; 141a - Second through hole; 142a - Third through hole. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present invention.

[0036] See Figure 1 , Figure 2 , the present invention provides a fan shaft seal device 100, including: a fan shaft 110; a connecting cylinder 130, the connecting cylinder 130 is a cylinder, and the connecting cylinder 130 is sleeved on the fan shaft 110; a sealing structure 140, the sealing structure 140 is arranged at both ends of the connecting cylinder 130; a gas sealing cavity 150 is formed between the two sealing structures 140 and between the connecting cylinder 130 and the fan shaft 110; a connecting hole 120, the connecting hole 120 is arranged on the connecting cylinder 130, and the connecting hole 120 is connected to the gas sealing cavity 150, wherein the connecting hole 120 includes: a first connecting hole 121, the first connecting hole 121 is used for connecting compressed nitrogen; a second connecting hole 122, the second connecting hole 122 is used for connecting a drain valve.

[0037] In this embodiment, a gas seal cavity 150 formed by a seal structure 140, a connecting cylinder 130, and a fan shaft 110 is introduced with compressed nitrogen through a first connection hole 121, so that the inside of the gas seal cavity 150 is filled with compressed nitrogen. When the fan shaft 110 rotates, the compressed nitrogen forms a gas film between the fan shaft 110 and the seal structure 140. This gas film can support the load and reduce direct contact, thereby reducing wear and friction. When the gas seal cavity 150 inside the fan shaft seal device 100 needs to be cleaned, a second connection hole 122 is connected to a drain valve, and the sewage after cleaning in the gas seal cavity 150 flows out through the second connection hole 122.

[0038] Specifically, the fan shaft seal device 100 includes a fan shaft 110, a connecting cylinder 130, a seal structure 140, and a connection hole 120. Two seal structures 140, and the connecting cylinder 130 and the fan shaft 110 in the fan shaft seal device 100 between the two seal structures 140 form a closed gas seal cavity 150. The connecting cylinder is provided with two connection holes 120, a first connection hole 121 and a second connection hole 122. When the fan shaft seal device 100 operates, the first connection hole 121 communicates with compressed nitrogen to provide a lubricating effect for the fan shaft 110; when the gas seal cavity 150 inside the fan shaft seal device 100 needs to be cleaned, the second connection hole 122 is connected to a drain valve to facilitate the cleaning inside the gas seal cavity 150.

[0039] See Figure 1 , Figure 3 The connecting cylinder 130 includes: a cylinder 131 sleeved on the fan shaft 110; and connecting flanges 132 provided at both ends of the cylinder 131.

[0040] In this embodiment, the radial stability of the fan shaft 110 is improved, and the fan shaft 110 is prevented from loosening during operation.

[0041] Specifically, the connecting cylinder 130 in the fan shaft seal device 100 is composed of a cylinder 131 and two connecting flanges 132. The cylinder 131 is sleeved on the fan shaft 110, and the two connecting flanges 132 are provided at both ends of the cylinder 131, showing that the fan shaft 110 passes through the centers of the cylinder 131 and the connecting flanges 132.

[0042] See Figure 3 , the surface of the connecting flange 132 is provided with a plurality of first through holes 132a, and is connected to the first through holes 132a through fasteners 160 with the seal structure 140.

[0043] In this embodiment, the sealing performance of the gas seal cavity 150 inside the fan shaft seal device 100 is improved by connecting with fasteners 160, and internal gas leakage is prevented.

[0044] Preferably, six first through-holes 132a are provided on the surface of the connecting flange 132. The sealing structure 140 and the connecting flange 132 are connected by fasteners 160 through the first through-holes 132a. Then the connecting flange 132 belongs to the connecting cylinder 130, and the sealing structure 140 and the connecting flange 132 are connected by fasteners 160.

[0045] See Figure 4 , the connecting flange 132 is embedded in the end faces at both ends of the cylinder 131.

[0046] In this embodiment, the stability of the internal air seal cavity 150 is improved, and it is prevented that the connection structure of the air seal cavity 150 is misaligned during the operation of the fan shaft 110, resulting in gas leakage inside the air seal cavity 150.

[0047] Specifically, the connecting flange 132 inside the connecting cylinder 130 is embedded in the two end faces of the cylinder 131 to ensure the sealing performance of the fan shaft seal device 100.

[0048] See Figure 4 , the outer diameter of the cylinder 131 is smaller than the outer diameter of the connecting flange 132, and the first connection hole 121 and the second connection hole 122 are located between the two connecting flanges 132.

[0049] In this embodiment, the internal air seal cavity 150 is protected by the connecting flange 132, and the two connection holes 120 are located between the two connecting flanges 132, saving the internal space of the fan shaft seal device 100 and facilitating the connection of compressed nitrogen and the drain valve.

[0050] Specifically, the outer diameter of the cylinder 131 is smaller than the outer diameter of the connecting flange 132, and the first connection hole 121 and the second connection hole 122 on the cylinder 131 are located between the two connecting flanges 132.

[0051] See Figure 5 , radial protrusions 131a are provided at both ends of the cylinder 131; the end face of the connecting flange 132 is matched with the radial protrusions 131a.

[0052] In this embodiment, in order to fix the cylinder 131 and the two connecting flanges 132 and improve the stability of the connecting cylinder 130, this connection method is used to avoid gaps between the connection structures during the operation of the fan shaft 110, resulting in internal gas leakage, and to facilitate installation.

[0053] Specifically, a ring of radial protrusions 131a are provided on the two end faces of the cylinder 131 inside the connecting cylinder 130, and are matched and fixed with the end faces of the two connecting flanges 132 provided at both ends of the cylinder 131, so that the two connecting flanges 132 are attached to the end face of the cylinder 131 to prevent the compressed nitrogen inside the air seal cavity 150 from leaking.

[0054] See Figure 5, axial protrusions 131b are provided at both ends of the cylinder 131; the connecting flange 132 is sleeved outside the axial protrusion 131b.

[0055] In this embodiment, the position of the connecting flange 132 is restricted to ensure the stability of the space inside the gas seal cavity 150 and facilitate installation.

[0056] Specifically, a ring of protrusions is provided at the two variable edges of the axial plane of the cylinder 131 inside the connecting cylinder 130, and two connecting flanges 132 are sleeved outside the two axial protrusions 131b of the cylinder 131.

[0057] See Figure 4 , a groove is provided inside the connecting flange 132 for mating with the axial protrusion 131b.

[0058] In this embodiment, the axial protrusion 131b is embedded in the groove to improve the stability of the connecting flange 132 and the cylinder 131 and prevent looseness during the operation of the fan shaft 110.

[0059] Specifically, grooves are provided on the limiting surfaces where the two connecting flanges 132 cooperate with the cylinder 131, and a ring of axial protrusions 131b provided on the cylinder 131 is embedded in the grooves of the two connecting flanges 132, so that the inside of the connecting cylinder 130 is tightly connected.

[0060] See Figure 6 , the sealing structure 140 includes: a sealing ring 141, the inner ring 141b of the sealing ring is in contact with the fan shaft 110; a pressing flange 142, and the pressing flange 142 is provided on the end face of the sealing ring 141 on the side away from the cylinder 131.

[0061] In this embodiment, the inner ring 141b of the sealing ring moves relative to the fan shaft 110. At this time, the compressed nitrogen inside the gas seal cavity 150 forms a gas film on the surfaces of the two relatively moving structures, thereby reducing the contact and friction between the inner ring 141b of the sealing ring and the fan shaft 110. The two pressing flanges 142 on both sides make the entire fan shaft seal device 100 tightly connected, preventing the internal gas seal cavity 150 from leaking during the operation of the fan shaft 110.

[0062] Specifically, the sealing structure 140 inside the fan shaft seal device 100 is divided into a sealing ring 141 and a pressing flange 142. The inner ring 141b of the sealing ring is in contact with the fan shaft 110, so that an internal space forms a gas seal cavity 150 to prevent internal gas from leaking during the operation of the fan shaft 110; the pressing flange 142 is provided outside the sealing ring 141 on the end face of the side away from the cylinder 131.

[0063] See Figure 3, a plurality of second through holes 141a are provided on the surface of the sealing ring 141; a plurality of third through holes 142a are provided on the surface of the pressing flange 142; wherein, the first through hole 132a, the second through hole 141a, and the third through hole 142a are connected by a fastener 160.

[0064] In this embodiment, the connecting cylinder 130 inside the fan shaft seal is connected to the sealing structure 140 through the fastener 160, and all structures are connected by one connection method, improving the stability of the internal structure of the fan shaft seal device 100, and ensuring that when the fan shaft 110 is running, the compressed nitrogen in the internal air sealing cavity 150 can stably play a lubricating role.

[0065] Preferably, six first through holes 132a are provided on the surface of the connecting flange 132 inside the connecting cylinder 130, six second through holes 141a are provided on the surface of the sealing ring 141 of the sealing structure 140, and six third through holes 142a are provided on the pressing flange 142 of the sealing structure 140. The six through holes of the three structures are aligned, and the first through hole 132a, the second through hole 141a, and the third through hole 142a are connected by a fastener 160, so that the sealing structure 140 composed of the sealing ring 141 and the pressing flange 142 is connected to the connecting flange 132. Then, the sealing structure 140 and the connecting flange 132 are connected by a fastener 160 to form the fan shaft seal device 100. Ensure the sealing performance of the internal air sealing cavity 150 during the operation of the fan shaft seal device 100.

[0066] The main problem solved by the present utility model is how to solve the lubrication effect of the fan shaft when using a food-grade fan. Two sealing structures 140 inside the fan shaft seal device 100, as well as the connecting cylinder 130 between the two sealing structures 140 and the fan shaft 110 form an air sealing cavity 150. When the fan shaft seal device 100 works, the first connection hole 132a is connected to compressed nitrogen, so that the inside of the air sealing cavity 150 is filled with compressed nitrogen. A gas film is formed between the surface of the inner ring 141b of the sealing ring and the surface of the fan shaft 110 that moves relative to each other. This gas film can support the load and reduce direct contact, thereby reducing wear and friction. Compared with lubricating oil, nitrogen will not produce dripping, avoiding environmental pollution and the risk of product being contaminated by oil. It is suitable for industries with high cleanliness requirements such as food and medicine. The nitrogen sealing system can more effectively isolate oxygen and moisture, reduce oxidation corrosion and wear, and help extend the service life of the fan and other related equipment. Using nitrogen sealing reduces the consumption and replacement frequency of lubricating oil, reduces maintenance costs and labor intensity. At the same time, it avoids equipment shutdown and cleaning work caused by lubricating oil leakage. When the fan shaft seal device 100 is cleaned, the second connection hole 122 is connected to the drain valve, and after effective cleaning inside the air sealing cavity 150, it can flow out of the air sealing cavity 150 through the second connection hole 122 and be discharged into the drain valve.

[0067] Although the present utility model is disclosed as above, the present utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the scope defined by the claims.

Claims

1. A fan shaft seal device, characterized in that: include: Fan shaft; A connecting tube, which is a cylinder and is sleeved on the fan shaft; A sealing structure, wherein the sealing structure is arranged at both ends of the connecting tube; an air sealing cavity is formed between the two sealing structures and between the connecting tube and the fan shaft; A connection hole, the connection hole is provided on the connection tube, the connection hole is connected to the air sealing cavity, wherein the connection hole comprises: A first connection hole, the first connection hole is used to connect compressed nitrogen; The second connection hole is used to connect to the drain valve.

2. A fan shaft seal device according to claim 1, characterized in that: The connecting tube comprises: A cylinder, wherein the cylinder is sleeved on the fan shaft; Connecting flanges are arranged at both ends of the cylinder.

3. A fan shaft seal device according to claim 2, characterized in that: The surface of the connecting flange is provided with a plurality of first through holes, and the first through holes are connected to the sealing structure via fasteners.

4. A fan shaft seal device according to claim 2, characterized in that: The connecting flanges are embedded in both end surfaces of the cylinder.

5. A fan shaft seal device according to claim 2, characterized in that: The outer diameter of the cylinder is smaller than the outer diameter of the connecting flange, and the first connecting hole and the second connecting hole are located between the two connecting flanges.

6. A fan shaft seal device according to claim 4, characterized in that: The two ends of the cylinder are provided with radial protrusions; the end surface of the connecting flange cooperates with the radial protrusions.

7. A fan shaft seal device according to claim 4, characterized in that: Axial protrusions are arranged at both ends of the cylinder; and the connecting flange is sleeved on the outside of the axial protrusions.

8. A fan shaft seal device according to claim 7, characterized in that: A groove is provided on the inner side of the connecting flange for matching with the axial protrusion.

9. The fan shaft seal device according to claim 3, characterized in that: The sealing structure comprises: A sealing ring, wherein the inner ring of the sealing ring is in contact with the fan shaft; A clamping flange is arranged on the end surface of the sealing ring away from the cylinder.

10. The fan shaft seal device according to claim 9, characterized in that: The surface of the sealing ring is provided with a plurality of second through holes; the surface of the clamping flange is provided with a plurality of third through holes; Wherein, the first through hole, the second through hole and the third through hole are connected by fasteners.

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