Dynamic air seal structure of moving blade of axial flow fan

Abstract

The utility model discloses a dynamic air seal structure for moving blades of an axial flow fan, relates to the technical field of axial flow fans, and aims to solve the problem of poor air seal performance in the conventional axial flow fan. The air seal carbon structure rings are installed on the outer portions of the two ends of the rotor, the number of the air seal carbon structure rings is four, the four air seal carbon structure rings are all in a semicircular shape, installation bolt holes are formed in the four air seal carbon structure rings, bolts can be arranged in the installation bolt holes, and the air seal carbon structure rings are arranged on the outer portions of the two ends of the rotor. The inner grooves are formed in the outer wall of the air seal carbon structure ring and are in threaded connection with the rotor through bolts, the two inner grooves are formed in the outer wall of the air seal carbon structure ring, the fixing rods are arranged in the two inner grooves, and the fixing rods are fixedly connected with the rotor.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, specifically to the dynamic air seal structure of the moving blades of an axial flow fan. Background Technology

[0002] Axial flow fans are widely used; they are a type of fan where the airflow direction is the same as the fan blade axis, such as electric fans and air conditioner outdoor unit fans. They are called "axial flow" because the gas flows parallel to the fan axis. Axial flow fans are typically used in applications requiring high flow rates but low pressure. An axial flow fan is fixed in position and moves air.

[0003] For example, the Chinese authorized patent (CN214101050U) entitled "(A Double-Sealing Structure for an Axial Flow Fan Motor)" includes: a motor shaft and a motor housing. A front end cover is fixedly mounted on the motor housing. A shaft hole is located at the center of the front end cover, through which the motor shaft passes. An annular groove 1 and an annular groove 2 are coaxially arranged within the shaft hole. An outer sealing ring is located in an annular groove 1, and an inner sealing ring is located in an annular groove 2. Both the outer and inner sealing rings are fitted onto the motor shaft. A water-proof shell is also fitted onto the end of the front end cover near the outer sealing ring. A protective grille is provided at the opening of the water-proof shell. A water-absorbing sleeve is filled inside the protective grille and the water-proof shell. A humidity sensor is located inside the water-absorbing sleeve and is connected to a controller. By setting up structures such as the outer sealing ring, the problem of poor motor sealing effect can be solved, extending the service life of the motor.

[0004] However, existing axial flow fans suffer from poor air sealing performance, thus failing to meet current requirements. To address this, we propose a dynamic air sealing structure for the moving blades of axial flow fans. Utility Model Content

[0005] The purpose of this invention is to provide a dynamic air seal structure for the moving blades of an axial flow fan, so as to solve the problem of poor air seal performance in existing axial flow fans mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dynamic air seal structure for the moving blades of an axial flow fan, comprising: an axial flow fan body and a stator shaft, wherein a rotor is disposed inside the axial flow fan body;

[0007] Also includes:

[0008] A gas-sealing carbon structural ring is installed around the outside of both ends of the rotor. There are four gas-sealing carbon structural rings, each of which is semi-circular in shape. Each of the four gas-sealing carbon structural rings has mounting bolt holes inside, and bolts can be installed inside the mounting bolt holes and connected to the rotor threadedly through the bolts.

[0009] The inner groove is installed inside the outer wall of the gas-sealed carbon structure ring. There are two inner grooves, and a fixing rod is installed inside the two inner grooves. The fixing rod is fixedly connected to the rotor.

[0010] Preferably, an outer ring is provided around the outside of the fixing rod, and a threaded rod is provided above the fixing rod. One end of the threaded rod passes through the outer ring and the inside of the fixing rod and extends to the bottom of the fixing rod. The threaded rod is threadedly connected to the fixing rod, and a push block is provided at one end of the threaded rod.

[0011] Preferably, a connecting rod is provided between the two ends of the stator shaft, and the connecting rod is welded and fixed to the stator shaft.

[0012] Preferably, a raised shaft is provided around the rear side of the two stator shafts, and the raised shaft is integrally formed with the stator shaft.

[0013] Preferably, blades are provided between the rotor and the axial flow fan body, and a plurality of blades are provided.

[0014] Preferably, the two sides of several blades are welded to the outer wall of the rotor and the inner wall of the axial flow fan body, respectively, and an inner cavity is provided at the middle position inside the rotor.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model features several carbon gas seal rings, which are connected to the rotor's outer wall by external bolts and threads. This allows for a gap seal between the rotor and stator shaft, thereby improving the performance of the gas seal structure and effectively avoiding the problem of poor gas seal performance in existing axial flow fans. The gap adjustment mechanism precisely adjusts the working gap of the gas seal, facilitating adjustment and replacement during maintenance. This ensures the sealing effect of the gas seal, reduces oil leakage and corrosion in the bearing housing, and minimizes economic losses caused by fan maintenance.

[0017] 2. By using the fixed rod, threaded rod, nut, and push block, after a period of use, the carbon structure ring of the gas seal may experience wear and tear due to rotor friction, resulting in an excessively large gap seal distance. Rotating the threaded rod allows the push block to push the inner side of the carbon structure ring, effectively keeping the gap seal distance within the design range. Furthermore, after adjusting the threaded rod, rotating the nut's thread can effectively fix its position, ensuring the gap seal distance remains within the design range and preventing unexpected deterioration of the gas seal performance. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the axial flow fan body of this utility model;

[0020] Figure 3 This is a schematic diagram of a partial structure of the stator shaft of this utility model;

[0021] Figure 4 This is a partial structural diagram of the gas-sealing carbon structure ring of this utility model;

[0022] Figure 5 This is a partially enlarged structural diagram of point A of this utility model;

[0023] In the diagram: 100, Axial flow fan body; 101, Blade; 102, Rotor; 103, Inner cavity; 104, Air seal carbon structure ring; 10401, Mounting bolt hole; 10402, Inner groove; 10403, Fixing rod; 10404, Threaded rod; 10405, Nut; 10406, Push block; 10407, Outer ring; 200, Stator shaft; 201, Raised shaft; 202, Connecting rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figure 1-5 An embodiment of the present invention provides a dynamic air seal structure for the moving blades of an axial flow fan, comprising: an axial flow fan body 100 and a stator shaft 200, wherein a rotor 102 is disposed inside the axial flow fan body 100;

[0027] Also includes:

[0028] The gas-sealing carbon structure ring 104 is installed on the outer ring of both ends of the rotor 102. There are four gas-sealing carbon structure rings 104, and each of the four gas-sealing carbon structure rings 104 has a semi-circular shape. Each of the four gas-sealing carbon structure rings 104 has a mounting bolt hole 10401 inside. Bolts can be installed inside the mounting bolt hole 10401 and are threadedly connected to the rotor 102 through the bolts.

[0029] The inner groove 10402 is installed inside the outer wall of the gas seal carbon structure ring 104. There are two inner grooves 10402. The two inner grooves 10402 are provided with fixing rods 10403 inside, and the fixing rods 10403 are fixedly connected to the rotor 102.

[0030] The air-sealing carbon structure ring 104, along with the fixing rod 10403, threaded rod 10404, nut 10405, and push block 10406, are connected to the outer wall of the rotor 102 by external bolts, allowing for a gap seal between the rotor 102 and the stator shaft 200. This enables the installation of the air-sealing structure. After a period of use, the air-sealing carbon structure ring 104 may experience frictional wear from the rotor 102, resulting in an excessively large gap seal distance. By rotating the threaded rod 10404, the push block 10406 ​​can be pushed inside the air-sealing carbon structure ring 104, effectively keeping the gap seal distance within the design range. After adjusting the threaded rod 10404, the threaded rotation of the nut 10405 can effectively fix the position of the threaded rod 10404, preventing rotation.

[0031] Example 2

[0032] Please see Figure 3 An outer ring 10407 is provided around the outside of the fixing rod 10403. A threaded rod 10404 is provided above the fixing rod 10403. One end of the threaded rod 10404 passes through the outer ring 10407 and the inside of the fixing rod 10403 and extends to the bottom of the fixing rod 10403. The threaded rod 10404 is threadedly connected to the fixing rod 10403. A push block 10406 ​​is provided at one end of the threaded rod 10404.

[0033] The push block 10406 ​​provided at one end of the threaded rod 10404 can effectively push the threaded rod 10404 inward when the threaded rod 10404 and the fixed rod 10403 rotate in the thread.

[0034] Please see Figure 3 A connecting rod 202 is provided between the two ends of the stator shaft 200, and the connecting rod 202 is welded and fixed to the stator shaft 200. A protruding shaft 201 is provided around the rear side of the two stator shafts 200, and the protruding shaft 201 is integrally formed with the stator shaft 200.

[0035] Please see Figure 1 and Figure 2 A blade 101 is provided between the rotor 102 and the axial flow fan body 100, and several blades 101 are provided. The two sides of the several blades 101 are welded to the outer wall of the rotor 102 and the inner wall of the axial flow fan body 100, respectively. An inner cavity 103 is provided in the middle position inside the rotor 102.

[0036] The inner cavity 103 is designed to effectively install the connecting rod 202.

[0037] Working principle: When installing the air seal element on the axial flow fan blades, the air seal carbon structure ring 104 can be connected to the outer wall of the rotor 102 by external bolts, so that there is a gap seal between the rotor 102 and the stator shaft 200, thereby realizing the installation of the air seal structure. After a period of use, the air seal carbon structure ring 104 will be worn by friction from the rotor 102, resulting in an excessive gap seal distance. Then, by rotating the threaded rod 10404, the push block 10406 ​​can push the inner side of the air seal carbon structure ring 104, effectively keeping the gap seal distance within the design value range.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dynamic air seal structure for the moving blades of an axial flow fan, comprising an axial flow fan body (100) and a stator shaft (200), wherein a rotor (102) is provided inside the axial flow fan body (100); Its features are: Also includes: A gas-sealing carbon structure ring (104) is installed around the outer edge of both ends of the rotor (102). Several gas-sealing carbon structure rings (104) are provided, each of which has a semi-circular shape. Each of the gas-sealing carbon structure rings (104) has a mounting bolt hole (10401) inside. Bolts can be installed inside the mounting bolt holes (10401) and are threadedly connected to the rotor (102) through the bolts. The inner groove (10402) is installed inside the outer wall of the gas-sealed carbon structure ring (104). There are two inner grooves (10402). The two inner grooves (10402) are provided with fixing rods (10403), and the fixing rods (10403) are fixedly connected to the rotor (102).

2. The dynamic air seal structure for axial flow fan blades according to claim 1, characterized in that: An outer ring (10407) is provided around the outside of the fixing rod (10403). A threaded rod (10404) is provided above the fixing rod (10403). One end of the threaded rod (10404) passes through the outer ring (10407) and the inside of the fixing rod (10403) and extends to the bottom of the fixing rod (10403). The threaded rod (10404) is threadedly connected to the fixing rod (10403). A push block (10406) is provided at one end of the threaded rod (10404).

3. The dynamic air seal structure for axial flow fan blades according to claim 1, characterized in that: A connecting rod (202) is provided between the two ends of the stator shaft (200), and the connecting rod (202) is welded and fixed to the stator shaft (200).

4. The dynamic air seal structure for axial flow fan blades according to claim 1, characterized in that: A raised shaft (201) is provided around the rear side of the two stator shafts (200), and the raised shaft (201) is integrally formed with the stator shaft (200).

5. The dynamic air seal structure for axial flow fan blades according to claim 1, characterized in that: Blades (101) are provided between the rotor (102) and the axial flow fan body (100), and there are several blades (101).

6. The dynamic air seal structure for axial flow fan blades according to claim 5, characterized in that: The two sides of several blades (101) are welded to the outer wall of the rotor (102) and the inner wall of the axial flow fan body (100), respectively. An inner cavity (103) is provided in the middle position inside the rotor (102).

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