CN-224228931-U - Shaft end sealing structure and centrifugal fan applying same

CN224228931UCN 224228931 UCN224228931 UCN 224228931UCN-224228931-U

Abstract

The utility model relates to the technical field of shaft end sealing of centrifugal fans, in particular to a shaft end sealing structure and a centrifugal fan applying the same. The shaft end sealing structure comprises an outer layer sealing piece and an inner layer sealing piece which is arranged in the outer layer sealing piece and is matched with the outer layer sealing piece, wherein the inner layer sealing piece is made of flexible sealing materials, and the centrifugal fan comprises the shaft end sealing structure, a base, a driving piece arranged above the base, a volute arranged at the tail end of the driving piece and an impeller arranged in the volute, wherein the inner layer sealing piece is arranged on a main shaft between the driving piece and the impeller, and the inner layer sealing piece is tightly arranged on the outer wall of the volute. The utility model provides a shaft end sealing structure with the advantages of good sealing effect, low cost and the like, and also provides a centrifugal fan with the shaft end sealing structure.

Inventors

Yu Zhouyou
HUANG GUANGHUA
Yu Zuyou

Assignees

浙江华航风机科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250519

Claims (9)

1. The shaft end sealing structure is characterized by comprising an outer layer sealing piece and an inner layer sealing piece which is arranged in the outer layer sealing piece and is matched with the outer layer sealing piece, wherein a plurality of protrusions are arranged on the inner side of the outer layer sealing piece, and the protrusions are correspondingly arranged in the inner layer sealing piece.
2. A shaft end sealing arrangement according to claim 1, wherein the inner seal is a flexible sealing material.
3. A shaft end sealing structure according to claim 1, wherein the outer sealing member is provided with an oil filler hole penetrating therethrough.
4. A shaft end sealing structure according to claim 3, wherein the oil filler hole is provided directly opposite to the outer wall of the inner seal member.
5. A shaft end sealing structure according to claim 3, wherein the oil filler hole and the protrusion do not interfere with each other.
6. A centrifugal fan is characterized by comprising a shaft end sealing structure, a base, a driving piece, a volute and an impeller, wherein the driving piece is arranged above the base, the volute is arranged at the tail end of the driving piece, the impeller is arranged in the volute, the inner sealing piece is arranged on a main shaft between the driving piece and the impeller, and the inner sealing piece is closely arranged on the outer wall of the volute.
7. The centrifugal fan according to claim 6, wherein an air inlet is provided at one side of the scroll casing.
8. The centrifugal fan according to claim 7, wherein an air outlet is provided at the top of the scroll casing.
9. The centrifugal fan according to claim 8, wherein a drain valve is provided at the bottom of the volute.

Description

Shaft end sealing structure and centrifugal fan applying same Technical Field The utility model relates to the technical field of shaft end sealing of centrifugal fans, in particular to a shaft end sealing structure and a centrifugal fan applying the same. Background The centrifugal fan is a device for realizing gas transportation and pressurization by utilizing the centrifugal force principle, and is widely applied to the fields of industry, commerce and civilian use. The centrifugal force is generated by the rotating impeller, so that gas is sucked from a low-speed area and accelerated to a high-speed area, and the conveying and pressure lifting of the gas are realized. The Chinese patent CN215109608U discloses an explosion-proof centrifugal fan, which belongs to the field of fans and is used for explosion prevention, and comprises a support, wherein an explosion-proof motor is fixed on the support and drives a main shaft to rotate through a transmission group by an output shaft, the main shaft is connected with an impeller through an explosion-proof shaft seal on a shell, the impeller is positioned in the shell and is driven by the main shaft, an air inlet is formed in the shell, an explosion-proof opening ring is arranged at the outlet end of the air inlet and is positioned at the meshing opening of the impeller and the air inlet, the explosion-proof shaft seal comprises a sealing seat, a tooth-type labyrinth assembly, an air homogenizing ring, a gland and a graphite packing, the sealing seat is fixed on the shell, the main shaft is connected with the main shaft through the tooth-type labyrinth assembly, the gland and the graphite packing when the main shaft passes through the sealing seat, the air homogenizing ring is further processed on the sealing seat, positioned between two adjacent tooth-type labyrinth assemblies and connected with an external compressed air interface. In view of the technical scheme, the friction points of the explosion-proof fan can be improved, the explosion-proof performance of the fan is improved, the fan is suitable for places with low explosion-proof performance requirements, and the application range of the explosion-proof fan can be enlarged. But this technical scheme explosion-proof shaft seal comprises a plurality of parts, still can leave the clearance between the adjacent part, can make the clearance increase owing to the vibration of motor and the rotation of main shaft after long-time use to lead to sealed effect not good, and then lead to centrifugal fan's work efficiency low, and the work load of a plurality of parts is big, and the dismouting is inconvenient. Disclosure of utility model One of the purposes of the utility model is to provide a shaft end sealing structure aiming at the defects of the prior art, and the function of completely sealing a rotating shaft is realized by matching an outer sealing piece with an inner sealing piece, so that the problems of poor sealing effect and inconvenience in disassembly and assembly of a plurality of parts in the prior art are solved. In order to achieve the above purpose, the present utility model provides the following technical solutions: The shaft end sealing structure comprises an outer layer sealing piece and an inner layer sealing piece which is arranged inside the outer layer sealing piece and is matched with the outer layer sealing piece. Preferably, a plurality of protrusions are arranged on the inner side of the outer-layer sealing piece, and the protrusions are correspondingly arranged inside the inner-layer sealing piece. Preferably, the inner seal is a flexible sealing material. Preferably, the outer layer sealing member is provided with an oil filling hole in a penetrating manner. Preferably, the oil filling hole is arranged opposite to the outer wall of the inner-layer sealing piece. Preferably, the oil filling hole and the protrusion do not interfere with each other. The utility model further aims to overcome the defects of the prior art, and provides a centrifugal fan, wherein the shaft end sealing structure of the double-layer structure is arranged on the main shaft, the inner sealing piece is directly in contact sealing arrangement with the main shaft, the inner sealing piece and the main shaft can form a tight sealing surface, leakage of air, liquid or other mediums is effectively prevented, and the direct contact can ensure that the sealing gap between the sealing piece and the main shaft is minimized, so that the sealing reliability is improved. In order to achieve the above purpose, the present utility model provides the following technical solutions: The centrifugal fan comprises the shaft end sealing structure, the base, the driving piece arranged above the base, the volute arranged at the tail end of the driving piece and the impeller arranged in the volute, wherein the inner sealing piece is arranged on a main shaft between the driving piece and the impeller, and is closely arranged on the