A structure for high pressure centrifugal fan impeller and volute clearance seal
By employing a blade-type seal with a dynamic and static ring structure in the high-pressure centrifugal fan, combined with a labyrinth flow channel and lubricating oil in the flow channel, the problem of deteriorated sealing effect caused by wear and heat of the metal wear ring under high speed or vibration is solved, achieving high-efficiency sealing effect and durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LUOYANG DAGONG CARBON & TECH DEV CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-06-02
AI Technical Summary
In existing technologies, metal wear rings will wear down after long-term use under high-speed or vibration conditions, resulting in poor sealing performance. Furthermore, the heat generated by friction can cause localized overheating, affecting the sealing effect.
The blade-type seal includes a rotating ring and a stationary ring. The rotating ring is located outside the flow guide and the stationary ring is located outside the impeller. By filling the labyrinth flow channel, upper flow channel and lower flow channel with lubricating oil, a multi-layer sealing structure is formed. The lubricating oil absorbs frictional heat and remains stable in the seal.
It achieves stable sealing performance under high-speed or vibration conditions, reduces wear and heat effects, improves sealing reliability and durability, and enhances sealing performance through the multi-layer sealing effect of the lubricating oil.
Smart Images
Figure CN224315223U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of impeller and volute technology, specifically a structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan. Background Technology
[0002] The seal between the impeller and the volute is a key technology for ensuring pump efficiency, preventing leakage, and controlling wear.
[0003] By installing a metal wear-resistant ring between the impeller inlet and the volute, a precision gap is formed, reducing the backflow of high-pressure fluid to the low-pressure area and avoiding direct friction between the impeller and the volute.
[0004] In existing technologies, sealing is achieved solely through metal wear rings. However, under high-speed or vibration conditions, the metal wear rings will still wear down over time, affecting the sealing effect. Furthermore, the heat generated during friction can cause localized overheating and deformation, leading to a deterioration in the sealing performance. Therefore, we propose a structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan. This solves the problem that under high-speed or vibration conditions, the metal wear ring will still wear after long-term use, thus affecting the sealing effect. At the same time, the heat generated during friction can cause local overheating and deformation, leading to a deterioration in the sealing effect.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan, comprising a blade-type seal, wherein the blade-type seal is installed between the impeller and the guide shroud, the blade-type seal, the impeller, and the guide shroud are all vertically distributed, the blade-type seal includes a rotating ring and a stationary ring, both of which are configured as cavity structures, the rotating ring is disposed outside the guide shroud and forms a sealing structure, the rotating ring is disposed outside the guide shroud, the stationary ring is disposed outside the impeller, and the rotating ring is covered outside the stationary ring.
[0007] Preferredly, a plurality of first rings extend from the concave portion of the moving ring, and the first rings divide the moving ring into several chambers.
[0008] Preferably, multiple second rings extend from the concave part of the stationary ring, the second rings dividing the stationary ring into multiple chambers, and the second rings and the moving ring forming an upper flow channel.
[0009] Preferably, the first and second rings are interspersed.
[0010] Preferably, the moving ring and the stationary ring form a labyrinth flow channel through the first ring, the second ring and the lower ring.
[0011] Preferably, the stationary ring is provided with a lower ring, and the lower ring and the moving ring form a lower flow channel.
[0012] Preferably, the labyrinth flow channel, the upper flow channel, and the lower flow channel are connected, and the labyrinth flow channel, the upper flow channel, and the lower flow channel are filled with lubricating oil.
[0013] This utility model discloses a structure for sealing the gap between the impeller and the volute of a high-pressure centrifugal fan, which has the following beneficial effects:
[0014] 1. The gap seal structure uses a vertically distributed blade seal, impeller, and guide vane, resulting in a small volume of air cavity. The dynamic and static rings work together to seal the gap between the impeller and the guide vane. The blade seal is filled with lubricating oil, which remains stable within the blade seal, creating a sealing effect.
[0015] 2. The gap seal structure allows the lubricating oil to absorb the heat generated by friction in the blade seal, preventing localized overheating;
[0016] 3. The gap seal structure is filled with lubricating oil in the labyrinth flow channel, upper flow channel and lower flow channel, and the lubricating oil plays a multi-layer sealing role for the blade seal. Attached Figure Description
[0017] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of this embodiment;
[0019] Figure 2 This is a cross-sectional view of the blade seal in this embodiment;
[0020] Figure 3 This is an exploded view of the blade seal in this embodiment;
[0021] Figure 4 This is an example. Figure 2 A magnified view of A in the middle.
[0022] In the diagram: 1. Blade seal; 11. Moving ring; 111. First ring; 12. Stationary ring; 121. Lower ring; 122. Second ring; 13. Labyrinth channel; 14. Upper channel; 15. Lower channel. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0024] This application provides a structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan. This solves the problem that even under high-speed or vibration conditions, the metal wear ring will still wear down after long-term use, affecting the sealing effect. Furthermore, the heat generated during friction can cause localized overheating and deformation, leading to a deterioration in the sealing effect. The structure achieves a vertical distribution of the blade-type seal 1, impeller, and guide vane, resulting in a small volume occupied by the air cavity. Simultaneously, the dynamic ring 11 and the stationary ring 12 work together to seal the gap between the impeller and the guide vane. Lubricating oil is filled into the blade-type seal 1, and the lubricating oil remains stably present within the blade-type seal 1, forming a sealing effect.
[0025] Furthermore, the lubricating oil can absorb the heat generated by friction in the blade seal 1 and carry away the heat through circulation, thus avoiding local overheating;
[0026] Lubricating oil is filled into the labyrinth flow channel 13, the upper flow channel 14 and the lower flow channel 15, and the lubricating oil provides a multi-layer sealing effect for the blade seal 1.
[0027] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0028] This utility model discloses a structure for sealing the gap between the impeller and the volute of a high-pressure centrifugal fan.
[0029] According to the appendix Figure 1-4 As shown, it includes a blade-type seal 1, which is disposed between the impeller and the guide vane. The blade-type seal 1, the impeller, and the guide vane are vertically distributed. The blade-type seal 1 includes a rotating ring 11 and a stationary ring 12.
[0030] The moving ring 11 is located outside the fairing;
[0031] The stationary ring 12 is located outside the impeller, and the rotating ring 11 is covered outside the rotating ring 11.
[0032] The blade seal 1, impeller, and guide vane are vertically distributed, which occupies a small volume of the air cavity. At the same time, the gap between the impeller and the guide vane is sealed by the cooperation of the moving ring 11 and the stationary ring 12. The blade seal 1 is filled with lubricating liquid, which exists stably in the blade seal 1 to form a sealing effect.
[0033] Furthermore, the lubricating oil can absorb the heat generated by friction in the blade seal 1, preventing localized overheating.
[0034] The moving ring 11 has a cavity and multiple first rings 111 are provided in the moving ring 11, which divide the moving ring 11 into multiple chambers.
[0035] The stationary ring 12 has a cavity and multiple second rings 122 are provided in the stationary ring 12. The second rings 122 divide the stationary ring 12 into multiple chambers, and the second rings 122 and the moving ring 11 form an upper flow channel 14.
[0036] The upper flow channel 14 is filled with lubricating oil to achieve a sealing effect.
[0037] The first ring 111 and the second ring 122 are interspersed.
[0038] Multiple cavities are formed by the intersecting distribution of the first ring 111 and the second ring 122. The cavities are filled with lubricating oil to achieve a sealing effect.
[0039] The moving ring 11 and the stationary ring 12 form a labyrinth flow channel 13 through the first ring 111, the second ring 122 and the lower ring 121.
[0040] The labyrinth channel 13 is filled with lubricating liquid, which forms an oil film barrier in the labyrinth channel 13. The adhesion of the liquid surface tension fills the micro gaps, further improving the sealing effect.
[0041] By filling the labyrinth flow channel 13 with lubricating liquid, multiple sealed cavities are formed, which, together with the upper flow channel 14, enhance the sealing of the impeller and the guide shroud.
[0042] A lower ring 121 is provided in the stationary ring 12, and the lower ring 121 and the moving ring 11 form a lower flow channel 15.
[0043] The labyrinth flow channel 13, the upper flow channel 14, and the lower flow channel 15 are connected, and the labyrinth flow channel 13, the upper flow channel 14, and the lower flow channel 15 are filled with lubricating oil.
[0044] The lubricating oil is stably present in the vane seal 1, and the lubricating oil provides a multi-layer sealing effect for the vane seal 1.
[0045] By combining fluid simulation and numerical methods to solve the fluid dynamics control equations, and simulating physical phenomena such as fluid flow, heat transfer, and chemical reactions, the sealing effect can be verified.
[0046] The material of blade seal 1 can withstand pressures of -2000pa to 12000pa, with a pressure difference of 14000pa, and is suitable for high-pressure centrifugal fans with different pressure ranges.
[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan, comprising a blade-type seal (1), said blade-type seal (1) being installed between the impeller and the guide shroud, characterized in that, The blade seal (1), impeller and guide shroud are all vertically distributed. The blade seal (1) includes a moving ring (11) and a stationary ring (12). Both the moving ring (11) and the stationary ring (12) are set as cavity structures. The moving ring (11) is set outside the guide shroud and forms a sealing structure. The moving ring (11) is set outside the guide shroud. The stationary ring (12) is set outside the impeller. The moving ring (11) covers the outside of the stationary ring (12).
2. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 1, characterized in that, Multiple first rings (111) extend from the concave part of the moving ring (11), and the first rings (111) divide the moving ring (11) into several chambers.
3. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 2, characterized in that, Multiple second rings (122) extend from the concave part of the stationary ring (12), and the second rings (122) divide the stationary ring (12) into multiple chambers. The second rings (122) and the moving ring (11) form an upper flow channel (14).
4. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 3, characterized in that, The first ring (111) and the second ring (122) are interspersed.
5. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 1, characterized in that, The moving ring (11) and the stationary ring (12) form a maze flow channel (13) through the first ring (111), the second ring (122) and the lower ring (121).
6. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 4, characterized in that, The stationary ring (12) is provided with a lower ring (121), and the lower ring (121) and the moving ring (11) form a lower flow channel (15).
7. The structure for sealing the gap between the impeller and volute of a high-pressure centrifugal fan according to claim 5, characterized in that, The labyrinth flow channel (13), the upper flow channel (14) and the lower flow channel (15) are connected, and the labyrinth flow channel (13), the upper flow channel (14) and the lower flow channel (15) are filled with lubricating oil.