Sealed axial flow fan

Abstract

The utility model relates to the technical field of axial flow fans, in particular to a sealed axial flow fan. Comprising a shell, a shaft connecting mechanism and an impeller, the shaft connecting mechanism comprises a shell, the shell is fixedly connected to the machine shell, an oil cavity, a framework oil seal and an alloy sleeve are arranged in the shell, a sealing shell is arranged on the outer side of the belt wheel mechanism, and one end of the sealing shell is connected with the shell in a sealed mode. According to the fan, the driving device is arranged outside the machine shell, so that when the fan sucks dust, the dust does not easily enter the motor, and the motor is effectively protected; moreover, the belt pulley mechanism is connected with the rotating shaft, the sealing shell is arranged on the outer side of the belt pulley mechanism, dust cannot enter the belt pulley mechanism, and meanwhile, the oil cavity, the framework oil seal and the alloy sleeve are arranged in the shell, so that the sealing performance is high; therefore, dust at the rotating shaft at the impeller end can be effectively prevented from entering the belt pulley mechanism along the rotating shaft, and a strong sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of axial fans, in particular to a sealed axial fan. Background Art

[0002] Axial fans are very widely used. They are a type of fan in which the air flow direction is the same as the axis of the fan blades. For example, electric fans and the external fans of air conditioners operate in an axial flow manner. The reason for being called "axial flow" is that the gas flows parallel to the axis of the fan. Axial fans are usually used in occasions where a higher flow rate and a lower pressure are required.

[0003] Currently, the general structure of existing axial fans is that the motor is installed inside the casing. However, when axial fans are applied in some furniture factories or wood factories for extracting dust or waste gas, since the motor is installed inside the casing, dust is likely to enter the interior of the motor, causing motor failures, and the dust will adhere to the rotating shaft and the connection between the rotating shaft and the motor, resulting in the rotating shaft not rotating smoothly, thus greatly affecting the use effect of the axial fan; based on this, we propose a sealed axial fan. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a sealed axial fan. After the structure of the fan is improved, it can effectively solve the problems raised in the above background art.

[0005] The technical solution of the utility model is as follows:

[0006] A sealed axial fan includes a casing, a driving device, a shaft connection mechanism, and an impeller;

[0007] A driving device is fixedly installed on the outer side of the casing. The driving device is connected to a rotating shaft through a pulley mechanism. An axial connection mechanism is arranged on the outer side of the rotating shaft. One end of the rotating shaft far from the pulley mechanism is connected to an impeller;

[0008] The axial connection mechanism includes a housing. The housing is fixedly connected to the casing. An oil chamber, a skeleton oil seal, and an alloy sleeve are respectively arranged inside the housing. The skeleton oil seal and the alloy sleeve are respectively in transmission connection with the rotating shaft;

[0009] A sealing shell is arranged on the outer side of the pulley mechanism. The sealing shell is fixedly connected to the casing. One end of the sealing shell is hermetically connected to the outer shell.

[0010] Furthermore, the casing has a hollow structure at the front and back. A connecting frame is fixedly installed inside the casing. The housing is fixedly connected to the connecting frame.

[0011] Furthermore, the driving device is a motor, and the driving device is fixedly installed on the top of the casing.

[0012] Further, the rotating shaft, the shaft connection mechanism and the impeller are all arranged inside the casing.

[0013] Further, an oil chamber housing is fixedly installed inside the outer casing. An oil chamber is formed inside the oil chamber housing. The skeleton oil seal is fixedly connected to the inner wall of the outer casing. The oil chamber housing and the outer casing are arranged side by side.

[0014] Further, one end of the outer casing close to the impeller is connected with a connecting column, and the alloy sleeve is fixedly installed on the inner wall of the connecting column.

[0015] Further, the clearance between the alloy sleeve and the rotating shaft is 50 microns; the clearance between the skeleton oil seal and the rotating shaft is 100 microns.

[0016] Further, an oil inlet pipe is arranged on the oil chamber housing, and the other end of the oil inlet pipe communicates with the outer casing; there is a clearance between the oil chamber housing and the rotating shaft, and a grease layer is arranged inside the oil chamber.

[0017] Further, a bracket is fixedly installed at the bottom of the casing.

[0018] The beneficial effects of the present utility model are as follows:

[0019] Compared with the prior art, by arranging the driving device outside the casing, when the present blower sucks dust, the dust is not easy to enter the motor, effectively protecting the motor; moreover, the rotating shaft is connected by a pulley mechanism, and a sealing shell is arranged outside the pulley mechanism, so that the dust will not enter the pulley mechanism either. At the same time, an outer casing is arranged outside the rotating shaft, the outer casing is hermetically connected with the sealing shell, and an oil chamber, a skeleton oil seal and an alloy sleeve are arranged inside the outer casing, which has strong sealing performance. Furthermore, it can effectively prevent the dust from entering the pulley mechanism and even the motor along the rotating shaft at the rotating shaft end of the impeller, achieving a strong sealing effect, effectively ensuring the normal operation of the present blower and prolonging its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present utility model;

[0021] Figure 2 is a schematic structural view of the present utility model after removing the sealing shell;

[0022] Figure 3 is a schematic structural view of the shaft connection mechanism of the present utility model;

[0023] Figure 4 is a schematic structural view of the shaft connection mechanism of the present utility model from another perspective;

[0024] Figure 5This is a schematic structural diagram of the shaft connection mechanism of the present utility model after disassembling the outer shell and the connection column.

[0025] In the figure, 1 is the housing; 2 is the driving device; 3 is the shaft connection mechanism; 4 is the impeller; 5 is the pulley mechanism; 6 is the rotating shaft; 7 is the outer shell; 8 is the skeleton oil seal; 9 is the alloy sleeve; 10 is the sealing shell; 11 is the connecting frame; 12 is the oil chamber housing; 13 is the connection column; 14 is the oil inlet pipe; 15 is the bracket. Specific embodiments

[0026] The following further describes the specific embodiments of the present utility model with reference to the accompanying drawings:

[0027] As Figures 1-5 shown,

[0028] A sealed axial flow fan includes a housing 1, a driving device 2, a shaft connection mechanism 3 and an impeller 4; the driving device 2 is fixedly installed on the outside of the housing 1, the driving device 2 is connected to a rotating shaft 6 through a pulley mechanism 5, the shaft connection mechanism 3 is arranged on the outside of the rotating shaft 6, and one end of the rotating shaft 6 away from the pulley mechanism 5 is connected to the impeller 4; the shaft connection mechanism 3 includes an outer shell 7, the outer shell 7 is fixedly connected to the housing 1, an oil chamber, a skeleton oil seal 8 and an alloy sleeve 9 are respectively arranged inside the outer shell 7, and the skeleton oil seal 8 and the alloy sleeve 9 are respectively in transmission connection with the rotating shaft 6; a sealing shell 10 is arranged on the outside of the pulley mechanism 5, the sealing shell 10 is fixedly connected to the housing 1, and one end of the sealing shell 10 is in sealed connection with the outer shell 7; in this embodiment, by providing the sealing shell 10 and the shaft connection mechanism 3, in the rotating shaft 6 inside the housing 1, only a gap is formed between the rotating shaft 6 and the alloy sleeve 9. However, since the inside of the outer shell 7 is not only provided with the alloy sleeve 9, but also provided with the skeleton oil seal 8 and the oil chamber, further forming a mechanical seal and an oil seal. At the same time, the gaps between the alloy sleeve 9 and the skeleton oil seal 8 and the rotating shaft 6 are very small, so that dust can be effectively prevented from entering the inside of the shaft connection mechanism 3 through the rotating shaft 6, forming an effective seal.

[0029] As a preferred embodiment; the housing 1 has a hollow structure at the front and back, and a connecting frame 11 is fixedly installed inside the housing 1, and the outer shell 7 is fixedly connected to the connecting frame 11; by providing the connecting frame 11, the purpose is to effectively fix the outer shell 7, making the fan more stable during operation.

[0030] As a preferred embodiment; the driving device 2 is a motor, and the driving device 2 is fixedly installed on the top of the housing 1; the driving device 2 can also be arranged at any position on the outside of the housing 1 according to the actual installation situation.

[0031] Specifically; the rotating shaft 6, the shaft connection mechanism 3 and the impeller 4 are all arranged inside the housing 1.

[0032] As a preferred embodiment, an oil chamber housing 12 is fixedly installed inside the outer shell 7. An oil chamber is formed inside the oil chamber housing 12. The skeleton oil seal 8 is fixedly connected to the inner wall of the outer shell 7. The oil chamber housing 12 and the outer shell 7 are arranged side by side. By providing the oil chamber housing 12, an oil chamber can be formed, and thus an oil seal can be formed, further improving the sealing effect of this fan.

[0033] As a preferred embodiment, a connecting column 13 is connected to one end of the outer shell 7 close to the impeller 4. The alloy sleeve 9 is fixedly installed inside the connecting column 13. It can be understood that the diameter of the connecting column 13 is smaller than that of the outer shell 7. Since the diameter of the alloy sleeve 9 is small, the connecting column 13 is integrally formed or welded, which can effectively install the alloy sleeve 9 and make the sealing effect better. It is worth mentioning that the alloy sleeve 9 can also be replaced by a bearing.

[0034] As a preferred embodiment, the gap between the alloy sleeve 9 and the rotating shaft 6 is 50 microns; the gap between the skeleton oil seal 8 and the rotating shaft 6 is 100 microns. While not affecting the rotation of the rotating shaft 6, the gaps between the rotating shaft 6 and the alloy sleeve 9 and between the rotating shaft 6 and the skeleton oil seal 8 are very small, almost able to block dust of any size, and even able to effectively block the entry of water.

[0035] As a preferred embodiment, an oil inlet pipe 14 is provided on the oil chamber housing 12, and the other end of the oil inlet pipe 14 communicates with the outer shell 7. There is a gap between the oil chamber housing 12 and the rotating shaft 6, and a grease layer is provided inside the oil chamber. By providing the oil inlet pipe 14, the grease inside the oil chamber can be effectively replenished. Moreover, the oil chamber can also be used as a heat and cold chamber. In addition, the grease layer can not only provide lubricating oil for the skeleton oil seal 8 and the alloy sleeve 9, but also form an oil seal, effectively improving the sealing effect of this fan.

[0036] As a preferred embodiment, a bracket 15 is fixedly installed at the bottom of the housing 1. The setting of the bracket 15 facilitates the installation of this fan in different environments.

[0037] The working principle of the present utility model is as follows: Start the motor, the motor drives the pulley mechanism 5 to rotate, then drives the rotating shaft 6 to rotate, and finally drives the impeller 4 to rotate.

[0038] It should be pointed out that the main problems in the prior art are: When an axial flow fan is used in some furniture factories or wood factories for extracting dust or waste gas, since the motor is installed inside the housing, dust is likely to enter the inside of the motor, causing motor failure, and the dust will adhere to the rotating shaft and the connection between the rotating shaft and the motor, resulting in the rotating shaft not rotating smoothly.

[0039] Therefore, after the improvement of this application, by arranging the driving device 2 outside the casing 1, when the blower sucks dust, the dust is not easily introduced into the motor, effectively protecting the motor. Moreover, the pulley mechanism 5 is used to connect the rotating shaft 6, and a sealing housing 10 is arranged outside the pulley mechanism 5, so that the dust will not enter the pulley mechanism 5 either. At the same time, an outer housing 7 is arranged outside the rotating shaft 6, and the outer housing 7 is hermetically connected to the sealing housing 10. An oil chamber, a skeleton oil seal 8 and an alloy sleeve 9 are arranged inside the outer housing 7, which has strong sealing performance. Furthermore, it can effectively prevent the dust from entering the pulley mechanism 5 along the rotating shaft 6 at the rotating shaft 6 end of the impeller 4 and even entering the motor, achieving a strong sealing effect, effectively ensuring the normal operation of this blower and extending its service life.

[0040] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A sealed axial flow fan, comprising a casing, a driving device, a shaft connection mechanism and an impeller; A driving device is fixedly installed on the outer side of the housing, the driving device is connected to a rotating shaft through a pulley mechanism, a shaft connecting mechanism is arranged on the outer side of the rotating shaft, and an impeller is connected to one end of the rotating shaft away from the pulley mechanism; the characteristics are: The shaft connection mechanism comprises a shell, the shell is fixedly connected to the casing, the inside of the shell is respectively provided with an oil chamber, a skeleton oil seal and an alloy sleeve, the skeleton oil seal and the alloy sleeve are respectively connected to the rotating shaft in a transmission manner; A sealing shell is arranged on the outer side of the pulley mechanism. The sealing shell is fixedly connected to the casing, and one end of the sealing shell is sealed and connected to the outer shell.

2. A sealed axial flow fan according to claim 1, characterized in that: The casing is a hollow structure at the front and rear ends, a connecting frame is fixedly installed inside the casing, and the outer shell is fixedly connected to the connecting frame.

3. A sealed axial flow fan according to claim 2, characterized in that: The driving device adopts a motor, and the driving device is fixedly installed on the top of the casing.

4. A sealed axial flow fan according to claim 3, characterized in that: The rotating shaft, the shaft connection mechanism and the impeller are all arranged inside the casing.

5. A sealed axial flow fan according to claim 4, characterized in that: An oil chamber shell is fixedly installed inside the outer shell, an oil chamber is formed inside the oil chamber shell, the skeleton oil seal is fixedly connected to the inner wall of the outer shell, and the oil chamber shell and the outer shell are arranged side by side.

6. A sealed axial flow fan according to claim 5, characterized in that: One end of the shell close to the impeller is connected with a connecting column, and the alloy sleeve is fixedly installed on the inner wall of the connecting column.

7. A sealed axial flow fan according to claim 6, characterized in that: The gap between the alloy sleeve and the rotating shaft is 50 microns; the gap between the skeleton oil seal and the rotating shaft is 100 microns.

8. A sealed axial flow fan according to claim 7, characterized in that: The oil chamber shell is provided with an oil inlet pipe, and the other end of the oil inlet pipe is connected to the outer shell; there is a gap between the oil chamber shell and the rotating shaft, and a butter layer is provided inside the oil chamber.

9. A sealed axial flow fan according to claim 8, characterized in that: A bracket is fixedly installed on the bottom of the casing.

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