Air gap sealing structure

Abstract

The utility model relates to the technical field of mechanical sealing, and discloses an air gap sealing structure which comprises an outer body, the outer wall of the outer body is fixedly connected with a nesting pipe, the outer wall of the nesting pipe is provided with a cooling mechanism, the outer wall of the outer body is provided with a cleaning mechanism, and the cleaning mechanism comprises a first cleaning pipe. The inner wall of the first cleaning pipe is fixedly connected to the outer wall of the outer body, the right end of the outer wall of the first cleaning pipe communicates with a second cleaning pipe, the outer wall of the first cleaning pipe is in threaded connection with a bolt, a vertical groove is formed in the inner wall of the first cleaning pipe, and an annular groove is formed in the inner wall of the first cleaning pipe; and a cover body assembly is arranged on the outer wall of the first cleaning pipe. According to the utility model, when impurities are accumulated in the equipment, the axial fan is started to drive strong wind to enter the vertical groove and the annular groove, and sediments are efficiently removed from a structural gap by utilizing an airflow pressure difference principle, so that the continuous and smooth operation of the equipment is ensured, and the service life of the equipment is remarkably prolonged.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to an air gap sealing structure. Background Technology

[0002] Air gap sealing structure is a technology that uses tiny gaps to achieve efficient sealing. It is used in motor cooling systems and rotating machinery. The non-contact design uses centrifugal force to throw contaminants out of the gap, which has the advantages of no wear and long service life. The fully enclosed internal circulation system can be equipped with a centrifugal fan to improve heat dissipation efficiency. This structure is continuously optimized in the aerospace field, such as the honeycomb design, which further reduces leakage and ensures high equipment reliability.

[0003] Traditional air gap sealing structures rely on the tiny gap formed between the rotating shaft and the housing. When gas flows through this gap, the pressure gradually decreases due to viscous resistance and throttling effect, thus establishing a dynamic sealing barrier. However, the intrusion of tiny abrasive particles into the sealing gap will aggravate the abrasive wear on the surface of the stationary ring, resulting in a significant increase in the roughness of the mating end face, which in turn destroys the uniformity and stability of the gas film.

[0004] While existing air gap sealing structures optimize labyrinthine groove design to improve throttling efficiency, employ honeycomb sealing surfaces to enhance eddy current dissipation, and improve material wear resistance, their operating principle still relies on precision machining to create nanoscale gaps and utilize gas dynamics to construct a pressure gradient for sealing. However, in practical applications, these devices still suffer from the lack of a stationary ring cooling mechanism. As the stationary ring becomes the main heat load area during continuous operation of rotating machinery, the lack of a directional heat dissipation structure causes the temperature of this component to accumulate continuously. The high-temperature environment accelerates the oxidation process of the sealing ring, and abrasive particles can embed into the sealing end face at high temperatures, forming scratches. The rough surface leads to increased fluctuations in the gas film thickness, ultimately causing the risk of seal failure. Therefore, an air gap sealing structure is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an air gap sealing structure to improve the problem in the prior art where abrasive particles embed into the sealing end face at high temperatures, forming scratches, and the rough surface leads to increased fluctuations in the air film thickness, ultimately causing the risk of sealing failure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an air gap sealing structure, comprising an outer body, a nested tube fixedly connected to the outer wall of the outer body, a cooling mechanism provided on the outer wall of the nested tube, and a cleaning mechanism provided on the outer wall of the outer body;

[0007] The cleaning mechanism includes a first cleaning tube, the inner wall of which is fixedly connected to the outer wall of the outer body. A second cleaning tube is connected to the right end of the outer wall of the first cleaning tube. A bolt is threaded onto the outer wall of the first cleaning tube. A vertical groove and an annular groove are formed on the inner wall of the first cleaning tube. A cover assembly and a fan assembly are provided on the outer wall of the first cleaning tube. A flow assembly is provided at the top of the outer wall of the second cleaning tube.

[0008] As a further description of the above technical solution:

[0009] The cooling mechanism includes a cooling box, the outer wall of which is fixedly connected to the outer wall of the nested tube, a cooling cover fixedly connected to the top of the outer wall of the cooling box, a temperature-conducting plate fixedly connected to the inner wall of the cooling box, a shelf fixedly connected to the outer wall of the cooling box, a locking groove provided on the inner wall of the cooling box, and a guide component provided on the outer wall of the cooling box.

[0010] As a further description of the above technical solution:

[0011] The cleaning mechanism also includes a locking block, the outer wall of which is fixedly connected to the outer wall of the first cleaning tube.

[0012] As a further description of the above technical solution:

[0013] The cover assembly includes an outer cover, the bottom of the outer wall of the outer cover is fixedly connected to the top of the outer wall of the cooling box, and an inner plug is fixedly connected to the bottom of the outer wall of the outer cover.

[0014] As a further description of the above technical solution:

[0015] The fan assembly includes an axial fan, the outer wall of which is fixedly connected to the bottom of the outer wall of the outer cover, and a fixing column is fixedly connected to the outer wall of the axial fan.

[0016] As a further description of the above technical solution:

[0017] The circulation component includes a circulation box, the outer wall of which is fixedly connected to the outer wall of the first cleaning tube, the outer wall of which has a circulation groove, and the bottom of the outer wall of which is fixedly connected to a fixing plate.

[0018] As a further description of the above technical solution:

[0019] The guide assembly includes a connecting pipe, the outer wall of which is fixedly connected to the outer wall of the cooling box, and a ring pipe is fixedly connected to the outer wall of the connecting pipe.

[0020] As a further description of the above technical solution:

[0021] A moving ring is rotatably connected to the inner wall of the outer body, a stationary ring is fixedly connected to the rear side of the outer wall of the moving ring, and a buffer spring is fixedly connected to the front side of the outer wall of the stationary ring.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the cleaning mechanism improves stability by strengthening the connecting parts with bolts, and sets up vertical grooves and annular grooves to form internal flow channels. When impurities accumulate inside the equipment, the axial flow fan is activated to drive strong air into the vertical grooves and annular grooves. The principle of airflow pressure difference is used to efficiently remove the deposits from the structural gaps, thereby ensuring the continuous and smooth operation of the equipment and significantly extending the service life of the equipment.

[0024] 2. In this utility model, when the working temperature of the stationary ring is too high, the cooling cover is opened and dry ice is placed on the shelf of the cooling box. When the dry ice sublimates, it quickly absorbs a large amount of heat and generates low-temperature gas. The heat-conducting plate efficiently transfers this cold gas to the ring tube and connecting tube of the guide assembly. The cold airflow continuously covers the surface of the stationary ring to achieve rapid cooling. This process effectively inhibits the decrease in gas film stability caused by high-temperature oxidation of the stationary ring, and significantly improves the sealing performance and service life of the equipment. Attached Figure Description

[0025] Figure 1 This is a perspective view of an air gap sealing structure proposed in this utility model;

[0026] Figure 2 This is a front view of an air gap sealing structure proposed in this utility model;

[0027] Figure 3 This is an exploded view of an air gap sealing structure proposed in this utility model;

[0028] Figure 4 This is an exploded view of a cooling box with an air gap sealing structure proposed in this utility model;

[0029] Figure 5 This is an exploded view of the cleaning mechanism of the air gap sealing structure proposed in this utility model;

[0030] Figure 6 This is a cross-sectional view of the second cleaning pipe of an air gap sealing structure proposed in this utility model.

[0031] Legend:

[0032] 1. Outer body; 2. Nested tube; 3. Cooling mechanism; 301. Cooling box; 302. Cooling cover; 303. Temperature guide plate; 304. Shelf plate; 305. Engaging groove; 306. Guide assembly; 3061. Ring tube; 3062. Connecting pipe; 4. Cleaning mechanism; 401. First cleaning tube; 402. Second cleaning tube; 403. Engaging block; 404. Bolt; 405. Vertical groove; 406. Ring groove; 407. Cover assembly; 4071. Outer cover; 4072. Inner plug; 408. Fan assembly; 4081. Axial flow fan; 4082. Fixing column; 409. Flow assembly; 4091. Flow box; 4092. Flow groove; 4093. Fixing plate; 5. Moving ring; 6. Stationary ring; 7. Buffer spring. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 , Figure 2 and Figure 4 An embodiment of this utility model is provided: an air gap sealing structure, including an outer body 1, which is the supporting component of the entire sealing structure. A nested tube 2 is fixedly connected to the outer wall of the outer body 1, which is used to fix a cooling mechanism 3. The outer wall of the nested tube 2 is provided with a cooling mechanism 3, and the outer wall of the outer body 1 is provided with a cleaning mechanism 4.

[0035] The cleaning mechanism 4 includes a first cleaning pipe 401, the inner wall of which is fixedly connected to the outer wall of the outer body 1. A second cleaning pipe 402 is connected to the right end of the outer wall of the first cleaning pipe 401. Bolts 404 are threaded onto the outer wall of the first cleaning pipe 401 for fixing related components and improving operational stability. Vertical grooves 405 and circumferential grooves 406 are formed on the inner wall of the first cleaning pipe 401. A cover assembly 407 is provided on the outer wall of the first cleaning pipe 401, including an outer cover 4071. The bottom of the outer wall of the outer cover 4071 is fixedly connected to the top of the outer wall of the cooling box 301. An inner plug 4072 is fixedly connected to the bottom of the outer wall of the outer cover 4071. A fan assembly 408 is provided on the outer wall of the first cleaning pipe 401, including an axial fan 4081. The outer wall of the axial fan 4081 is fixedly connected to the bottom of the outer wall of the outer cover 4071. The cleaning mechanism 4 is fixedly connected to a fixed column 4082. A flow component 409 is provided on the top of the outer wall of the second cleaning tube 402. The flow component 409 includes a flow box 4091. The outer wall of the flow box 4091 is fixedly connected to the outer wall of the first cleaning tube 401. A flow groove 4092 is opened on the outer wall of the flow box 4091. A fixed plate 4093 is fixedly connected to the bottom of the outer wall of the flow box 4091. The cleaning mechanism 4 also includes a locking block 403, which further fixes the cleaning components. The outer wall of the locking block 403 is fixedly connected to the outer wall of the first cleaning tube 401. The first cleaning tube 401 and the second cleaning tube 402 are fixed to each other. A vertical groove 405 and an annular groove 406 are opened between them. When a lot of impurities are deposited inside the structure, the axial flow fan 4081 in the flow box 4091 is activated to drive strong air into the vertical groove 405 and the horizontal groove. By using the pressure principle, the airflow generated can quickly remove the deposited impurities inside, further improving the service life of the product.

[0036] Specifically, the cleaning mechanism 4 includes a first cleaning pipe 401, whose inner wall is directly fixed to the outer wall of the outer body 1 for reliable connection. A second cleaning pipe 402 is provided at the right end of the outer wall of the first cleaning pipe 401, and the two pipes are interconnected to form a fluid channel. A threaded bolt 404 is installed on the outer wall of the first cleaning pipe 401; the bolt 404 is used to fasten various related components and improve the overall structural stability. The inner wall of the first cleaning pipe 401 is designed with vertical grooves 405 and annular grooves 406 to reserve space for airflow. The outer wall of the first cleaning pipe 401 is equipped with… A cover assembly 407 is provided, which consists of an outer cover 4071 and an inner plug 4072. The bottom of the outer wall of the outer cover 4071 is welded to the top of the outer wall of the cooling box 301, and the bottom of the outer wall of the inner plug 4072 is fastened to the outer wall of the outer cover 4071, tightly fitting the tube body. A fan assembly 408 is installed on the outer wall of the first cleaning tube 401, including an axial fan 4081 and a fixing post 4082. The outer wall of the axial fan 4081 is bonded to the bottom of the outer wall of the outer cover 4071, and the outer wall of the fixing post 4082 is fixed to the surface of the axial fan 4081. To provide support and reinforcement, a flow assembly 409 is installed on the top of the outer wall of the second cleaning tube 402, including a flow box 4091, a flow groove 4092, and a fixing plate 4093. Bolts 404 fix the outer wall of the flow box 4091 to the outer wall of the first cleaning tube 401. The flow groove 4092 is formed on the outer wall surface of the flow box 4091, creating an open path. The bottom of the outer wall of the fixing plate 4093 is connected to the bottom of the flow box 4091 to ensure stable positioning. The cleaning mechanism 4 also integrates a locking block 403, which additionally secures the cleaning components to prevent loosening. The outer wall of the locking block 403 is welded to the outer wall of the first cleaning tube 401 to increase the safety factor. The first cleaning ring and the second cleaning ring are fixed to each other. The two rings have vertical grooves 405 and annular grooves 406 in the middle to provide an internal flow channel for airflow. When a lot of deposited impurities accumulate inside the structure, the operator starts the axial flow fan 4081 inside the flow box 4091 to drive strong air into the vertical grooves 405 and annular grooves 406. Utilizing the principle of pressure difference, this airflow can efficiently remove impurities accumulated in various places inside, keep the components clean, and extend the overall service life of the product.

[0037] Reference Figure 3 , Figure 5 and Figure 6The cooling mechanism 3 includes a cooling box 301, the outer wall of which is fixedly connected to the outer wall of the nested tube 2. A cooling cover 302 is fixedly connected to the top of the outer wall of the cooling box 301. A temperature-conducting plate 303 is fixedly connected to the inner wall of the cooling box 301. A shelf 304 is fixedly connected to the outer wall of the cooling box 301. A locking groove 305 is provided on the inner wall of the cooling box 301. A guide assembly 306 is provided on the outer wall of the cooling box 301. The guide assembly 306 includes a connecting pipe 3062. The outer wall of 3062 is fixedly connected to the outer wall of the cooling box 301. The outer wall of the connecting pipe 3062 is fixedly connected to the ring pipe 3061. When the temperature of the stationary ring 6 is too high during operation, by opening the cooling cover 302 and placing dry ice in the cooling box 301, the dry ice is placed on the placement plate 304 and the cold air is transferred to the surface of the stationary ring 6 through the ring pipe 3061 and the connecting pipe 3062 via the heat conduction plate 303, thereby achieving the cooling of the stationary ring 6 and preventing its gas film stability from decreasing due to oxidation.

[0038] Specifically, the cooling mechanism 3 consists of a cooling box 301. The outer wall of the cooling box 301 is fixedly connected to the outer wall of the nested tube 2. A cooling cover 302 is fixedly installed on the top of the outer wall of the cooling box 301. A temperature-conducting plate 303 is fixedly provided on the inner wall of the cooling box 301. A shelf 304 is fixedly connected to the outer wall of the cooling box 301. A locking groove 305 is provided on the inner wall of the cooling box 301. A guide assembly 306 is arranged on the outer wall of the cooling box 301. The guide assembly 306 includes a connecting pipe 3062. The outer wall of the connecting pipe 3062 is fixed to the cooling box 301. The outer wall of the connecting pipe 3062 is fixedly installed with the ring pipe 3061. When the temperature of the stationary ring 6 rises excessively during operation, cooling measures are taken, including first opening the cooling cover 302, placing dry ice material in the internal area of ​​the cooling box 301, placing the dry ice on the surface of the placement plate 304, and the temperature guiding plate 303 guiding the cold air generated by the dry ice to the channel system of the ring pipe 3061 and the connecting pipe 3062. The cold air is transferred through this to cover the working surface of the stationary ring 6, achieving an effective temperature reduction effect and preventing the problem of decreased sealing film function caused by oxidation.

[0039] Reference Figure 1 , Figure 2 and Figure 3 The inner wall of the outer body 1 is rotatably connected to a rotating ring 5, which rotates at high speed with the rotating shaft. Its end face has a dynamic pressure groove. By pumping gas, a fluid dynamic pressure effect is generated to form an opening force to separate the sealing end face and maintain the non-contact gas film. The rear side of the outer wall of the rotating ring 5 is fixedly connected to a stationary ring 6, which is axially floating and supported by a buffer spring 7. It cooperates with the rotating ring 5 to form a sealing fit. When the gas film pressure and the closing force are balanced, a small gap is maintained. It also has the ability to follow the axial movement of the rotating ring 5. The front side of the outer wall of the stationary ring 6 is fixedly connected to a buffer spring 7, which provides the initial closing force to ensure that the sealing end face is in contact when the equipment is started and stopped. During operation, it forms a closing force together with the medium pressure and dynamically balances with the gas film opening force to maintain the stability of the gas film.

[0040] Specifically, a rotating ring 5 is rotatably installed on the inner wall of the outer body 1. This ring rotates at high speed with the shaft, and its end face is machined with a dynamic pressure groove. By using the rotation to pump gas, a hydrodynamic pressure effect is generated, forming an upward opening force, which separates the sealing end face and maintains a non-contact gas film. A stationary ring 6 is fixedly connected to the rear side of the outer wall of the rotating ring 5. This ring is axially floating supported by a buffer spring 7. When the gas film opening force and the spring medium closing force are balanced, a stable small gap is maintained. At the same time, it has axial following ability to compensate for the movement of the rotating ring 5. A buffer spring 7 is installed on the front side of the outer wall of the stationary ring 6. This spring provides the initial closing force to ensure that the sealing end face is in contact during the start-up and shutdown phases of the equipment. During operation, it forms a closing force together with the medium pressure, forming a dynamic balance with the gas film opening force to ensure the continuous and stable existence of the gas film.

[0041] Working principle: First, the cleaning mechanism 4 includes a first cleaning tube 401. Bolts 404 are used for threaded connection of components to enhance system stability. The first cleaning tube 401 is provided with vertical grooves 405 and annular grooves 406 to construct airflow channels. The outer wall of the locking block 403 is fixed to the surface of the first cleaning tube 401 to help lock the cleaning elements. The fan assembly 408 is equipped with an axial flow fan 4081. When impurities accumulate inside the equipment, the axial flow fan 4081 is started to drive high-speed strong wind into the vertical groove 405 and annular groove 406 channels. The airflow pressure difference force is used to efficiently remove the deposited particles, keep the gaps between components clean, ensure the continuous and smooth operation of the equipment, and substantially extend the service life of the product.

[0042] Furthermore, during the operation of the dry gas sealing system, if the temperature of the stationary ring 6 exceeds the safety threshold, the operator should promptly open the cooling cover 302 and correctly place dry ice blocks on the surface of the inner plate 304 of the cooling box 301. The dry ice material absorbs a large amount of ambient heat through phase change sublimation to generate low-temperature cold air. The temperature guiding plate 303 efficiently guides this cold airflow into the gas delivery channel composed of the ring pipe 3061 and connecting pipe 3062 of the guide component 306. The cold airflow continuously and evenly covers the sealing working surface of the stationary ring 6 to achieve rapid forced cooling. This process successfully prevents the sealing gas film from becoming unstable and failing due to high-temperature oxidation of the stationary ring 6, greatly improving sealing reliability and the overall lifespan of the equipment.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air gap sealing structure, comprising an outer body (1), characterized in that: The outer wall of the outer body (1) is fixedly connected to a nested tube (2), the outer wall of the nested tube (2) is provided with a cooling mechanism (3), and the outer wall of the outer body (1) is provided with a cleaning mechanism (4). The cleaning mechanism (4) includes a first cleaning tube (401), the inner wall of which is fixedly connected to the outer wall of the outer body (1), the right end of the outer wall of the first cleaning tube (401) is connected to a second cleaning tube (402), the outer wall of the first cleaning tube (401) is threaded with a bolt (404), the inner wall of the first cleaning tube (401) is provided with a vertical groove (405), the inner wall of the first cleaning tube (401) is provided with an annular groove (406), the outer wall of the first cleaning tube (401) is provided with a cover assembly (407), the outer wall of the first cleaning tube (401) is provided with a fan assembly (408), and the top of the outer wall of the second cleaning tube (402) is provided with a flow assembly (409).

2. The air gap sealing structure according to claim 1, characterized in that: The cooling mechanism (3) includes a cooling box (301), the outer wall of which is fixedly connected to the outer wall of the nested tube (2), a cooling cover (302) is fixedly connected to the top of the outer wall of the cooling box (301), a temperature-conducting plate (303) is fixedly connected to the inner wall of the cooling box (301), a shelf (304) is fixedly connected to the outer wall of the cooling box (301), a locking groove (305) is provided on the inner wall of the cooling box (301), and a guide component (306) is provided on the outer wall of the cooling box (301).

3. The air gap sealing structure according to claim 1, characterized in that: The cleaning mechanism (4) further includes a locking block (403), the outer wall of which is fixedly connected to the outer wall of the first cleaning tube (401).

4. The air gap sealing structure according to claim 1, characterized in that: The cover assembly (407) includes an outer cover (4071), the bottom of the outer wall of the outer cover (4071) is fixedly connected to the top of the outer wall of the cooling box (301), and an inner plug (4072) is fixedly connected to the bottom of the outer wall of the outer cover (4071).

5. The air gap sealing structure according to claim 1, characterized in that: The fan assembly (408) includes an axial fan (4081), the outer wall of which is fixedly connected to the bottom of the outer wall of the outer cover (4071), and a fixing post (4082) is fixedly connected to the outer wall of the axial fan (4081).

6. The air gap sealing structure according to claim 1, characterized in that: The circulation component (409) includes a circulation box (4091), the outer wall of which is fixedly connected to the outer wall of the first cleaning tube (401), a circulation groove (4092) is provided on the outer wall of the circulation box (4091), and a fixing plate (4093) is fixedly connected to the bottom of the outer wall of the circulation box (4091).

7. The air gap sealing structure according to claim 2, characterized in that: The guide assembly (306) includes a connecting pipe (3062), the outer wall of which is fixedly connected to the outer wall of the cooling box (301), and an annular pipe (3061) is fixedly connected to the outer wall of the connecting pipe (3062).

8. The air gap sealing structure according to claim 1, characterized in that: The inner wall of the outer body (1) is rotatably connected to a moving ring (5), the rear side of the outer wall of the moving ring (5) is fixedly connected to a stationary ring (6), and the front side of the outer wall of the stationary ring (6) is fixedly connected to a buffer spring (7).

Images