Multi-stage fan with noise reduction structure

Abstract

The utility model discloses a multistage fan with a noise reduction structure, which comprises a fan shell, a driving motor, a motor main shaft, an impeller assembly and a guide vane assembly, the fan shell comprises an outer shell, a sound insulation layer and an inner shell layer which are integrally mounted, the sound insulation layer is a composite layer with external sound insulation cotton and internal damping material, and the inner shell layer is a composite layer with external sound insulation cotton and internal damping material. The inner shell is formed by splicing guide vane outer shells of the guide vane assemblies, the impeller assembly comprises an impeller shell and impeller blades which are integrally formed, the guide vane assembly comprises a guide vane inner shell, guide vane blades and guide vane outer shells which are integrally formed, and a driving motor and a motor spindle are installed in the guide vane outer shell located in the middle. The motor main shaft penetrates through the guide vane inner shell and is integrally installed with the impeller assembly. The fan has the advantages of being low in operation noise, good in heat dissipation effect, long in service life and high in working efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to low noise fan design field especially a multistage fan with noise reduction structure. BACKGROUND

[0002] Impeller quantity represents the series of fan, and the impeller of multistage fan is above two, and its main structure includes guide vane, impeller and shell, and is widely used as power source. The existing multistage fan product lacks noise reduction structure, and the design is not reasonable, and there are problems of big noise, high cost and low efficiency, and it is urgent to improve the performance. SUMMARY

[0003] To solve the technical problems of prior art, the utility model provides a multistage fan with noise reduction structure to realize good performance of low operating noise, good heat dissipation effect, long service life and high working efficiency.

[0004] The technical scheme of the utility model is as follows:

[0005] A multistage fan with noise reduction structure, including fan casing, driving motor, motor main shaft, impeller assembly and guide vane assembly, the fan casing includes integrally installed outer shell, sound insulation layer and inner shell layer, the sound insulation layer is the composite layer of external sound insulation cotton and internal damping material, and the sound insulation layer forms the noise reduction structure between the outer shell and the inner shell, the inner shell is assembled by the guide vane shells of each guide vane assembly, the number of the impeller assembly and the guide vane assembly is above two, the impeller assembly includes integrally formed impeller shell and impeller blade, the guide vane assembly includes integrally formed guide vane inner shell, guide vane blade and guide vane shell, a driving motor is installed in the guide vane shell of the guide vane assembly in the middle, a motor main shaft is installed in the driving motor, the motor main shaft penetrates the guide vane inner shell and is integrally installed with the impeller assembly, the airflow passages of each impeller assembly and guide vane assembly are communicated with each other, the driving motor drives the motor main shaft to rotate and drives the impeller assembly to rotate synchronously, and the airflow is sent axially from the air inlet to the air outlet.

[0006] Preferably, annular connecting plates are arranged on both sides of the inner shell, the annular connecting plates are embedded between the inner shell and the outer shell, and the annular connecting plates and the inner shell are integrally fastened and installed through a bolt assembly.

[0007] Preferably, two end face flanges are installed on both sides of the outer shell, and the end face flanges and the outer shell are integrally fastened and installed through a bolt assembly.

[0008] Preferably, a base is integrally formed at the bottom of the outer shell, and a motor wiring port and two lifting rings are installed at the top of the outer shell.

[0009] Preferably, the impeller assemblies and guide vane assemblies are four, the impeller assemblies are divided into first-stage impeller, second-stage impeller, third-stage impeller and fourth-stage impeller, the guide vane assemblies are divided into first-stage guide vane, second-stage guide vane, third-stage guide vane and fourth-stage guide vane, and each impeller assembly and guide vane assembly is arranged along the length direction of the motor main shaft in sequence.

[0010] Preferably, an arc-shaped air inlet cover is mounted on the first-stage impeller assembly, and a guide vane cover plate is mounted on the last-stage guide vane assembly.

[0011] Preferably, each blade structure, number and size of the impeller assemblies are same, each blade structure, number and size of the guide vane assemblies are same, the number of blades of the impeller assemblies and guide vane assemblies are prime numbers and are arranged alternately, and gaps are arranged between adjacent impeller assemblies and guide vane assemblies.

[0012] Preferably, bolt mounting holes are arranged in a circular manner on the outer periphery of the guide vane housing of each guide vane assembly, and adjacent guide vane housings are fastened and assembled through bolt assemblies.

[0013] Preferably, a pair of end face round nuts are mounted on the left and right sides of the motor main shaft, a pair of middle round nuts are mounted on the middle part of the motor main shaft, and a shaft sleeve group is arranged between adjacent impeller assemblies and guide vane assemblies on the motor main shaft.

[0014] Preferably, a bearing assembly is mounted on at least one guide vane assembly, the bearing assembly comprises a deep groove ball bearing, a bearing end cover and an oil seal structure, the deep groove ball bearing is embedded and mounted in the middle part of the guide vane inner housing, and the left and right sides of the deep groove ball bearing are provided with the oil seal structure and the bearing end cover, and the motor main shaft is horizontally movably mounted in the deep groove ball bearing.

[0015] The utility model has the following beneficial effects:

[0016] 1. The inner and outer housings are integrally installed through the annular connecting plate and the end face flange, mainly adopt metal material, the structure is firm, the heat dissipation is good, and the noise reduction structure of the sound insulation composite layer is arranged between the inner and outer housings, so that the fan operation noise is significantly reduced.

[0017] 2. Modularization and integration design are adopted, the impeller is installed in the guide vane housing, adjacent guide vane housings are fastened through bolts to form the inner housing, and the utility model has the advantages of convenient installation, compact structure and small size.

[0018] 3. The number of guide vanes and impellers can be configured according to the design requirements of flow and air pressure, and the efficiency is improved through the specification parameter optimization of the shell and blade, and the full pressure shared by each impeller of the utility model is smaller than that of the single-stage impeller fan, which is beneficial to reduce the impeller rotating speed and the fan noise.

[0019] 4. The bearing and oil seal structure is arranged in the middle of the guide vane, the rotation resistance of the main shaft is reduced, the main shaft is supported, the rotation of the main shaft is more flexible, the energy consumption is low, and the service life is long;

[0020] 5. The multi-stage impeller driven by the motor has low cost, gaps between adjacent impellers and guide vanes, and can realize gas flow in the fan, thereby enhancing the heat dissipation effect of the motor, the main shaft, the bearing and other components, and prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a first sectional view of the multi-stage fan with the noise reduction structure of the utility model;

[0022] Fig. 2 It is a second sectional view of the multi-stage fan with the noise reduction structure of the utility model;

[0023] Fig. 3 It is a right view of the multi-stage fan with the noise reduction structure of the utility model;

[0024] In the drawing: 1-arc-shaped air inlet cover, 2-impeller assembly, 2a-first-stage impeller, 2b-second-stage impeller, 2c-third-stage impeller, 2d-fourth-stage impeller, 3-guide vane assembly, 3a-first-stage guide vane, 3b-second-stage guide vane, 3c-third-stage guide vane, 3d-fourth-stage guide vane, 4-outer shell, 5-inner shell, 6-sound insulation layer, 7-suspension ring, 8-motor wiring port, 9-end face flange, 10-annular connecting plate, 11-guide vane outer shell, 12-guide vane inner shell, 13-guide vane blade, 14-guide vane cover plate, 15-driving motor, 16-motor main shaft, 17-shaft sleeve group, 18-end face round nut, 19-bearing end cover, 20-oil seal structure, 21-deep groove ball bearing, 22-middle round nut, 23-base. DETAILED DESCRIPTION

[0025] The utility model will be further described in connection with the drawings and examples:

[0026] For example, Figs. 1-3The utility model provides a multistage fan with noise reduction structure, including fan casing, drive motor 15, motor spindle 16, impeller subassembly 2 and guide vane subassembly 3, the fan casing includes integrative installation's outer casing 4, sound insulation layer 6 and inner casing 5 layer, the sound insulation layer 6 is the composite layer of external sound insulation cotton, internal damping material, forms the noise reduction structure between outer casing 4, inner casing 5 by sound insulation layer 6, the inner casing 5 is assembled by the guide vane outer shell 11 of each guide vane subassembly 3, the number of impeller subassembly 2 and guide vane subassembly 3 is four, and impeller subassembly 2 includes integrally formed impeller casing and impeller blade, and guide vane subassembly 3 includes integrally formed guide vane inner shell 12, guide vane blade 13 and guide vane outer shell 11, one drive motor 15 is installed in the guide vane outer shell 11 of guide vane subassembly 3 in the middle, one motor spindle 16 is installed in drive motor 15, the both ends of motor spindle 16 are arranged in each guide vane inner shell 12 and are integrally installed with each impeller subassembly 2, and the airflow passage of each impeller subassembly 2 and guide vane subassembly 3 is communicated, drive motor 15 drives motor spindle 16 to rotate and drives impeller subassembly 2 to rotate synchronously, and airflow is inhaled from the air inlet, is transported horizontally through internal airflow passage, and is finally sent out from the air outlet in the axial direction.

[0027] In the embodiment, the annular connecting plate 10 is embedded between the inner casing 5 and the outer casing 4, and the annular connecting plate 10 and the inner casing 5 are integrally fastened and installed through the bolt assembly. The outer casing 4 is provided with two end face flanges 9 on both sides, and the end face flanges 9 and the outer casing 4 are integrally fastened and installed through the bolt assembly. Furthermore, the outer casing 4 is integrally formed with a base 23 at the bottom, and the outer casing 4 is provided with a motor wiring port 8 and two lifting rings 7 at the top. The motor wiring port 8 is used for wiring of the drive motor, and the lifting rings 7 are used for lifting and installing the fan. The outer casing 4 and the inner casing 5 are made of metal material, have high structural strength, and are easy to manufacture.

[0028] In the embodiment, the impeller assemblies 2 are divided into first-stage impeller 2a, second-stage impeller 2b, third-stage impeller 2c and fourth-stage impeller 2d, the guide vane assemblies 3 are divided into first-stage guide vane 3a, second-stage guide vane 3b, third-stage guide vane 3c and fourth-stage guide vane 3d, each of the impeller assemblies 2 and the guide vane assemblies 3 are arranged along the length direction of the motor main shaft 16 in sequence, and the first-stage impeller 2a is provided with the arc-shaped air inlet cover 1, and the last-stage guide vane 3a is provided with the guide vane cover plate 14, for the same air flow requirement of the fan, the multi-stage impeller is beneficial to reduce the pressure of each stage of the impeller, the noise is lower, and the service life is longer. The blade structure, number and size of each of the impeller assemblies 2 are the same, the blade structure, number and size of each of the guide vane assemblies 3 are the same, the number of the blades of the impeller assemblies 2 and the guide vane assemblies 3 are prime numbers and are staggered, there is a gap between the adjacent impeller assemblies 2 and the guide vane assemblies 3, the design is reasonable, the manufacturing is convenient, and the operation efficiency is high. The outer circumferential annular bolt mounting hole is arranged on the guide vane shell 11 of each of the guide vane assemblies 3, the adjacent guide vane shells 11 are integrally fastened and assembled through the bolt assembly, the installation is convenient, and the structure is firm.

[0029] In the embodiment, a pair of end face round nuts 18 are arranged on the left and right sides of the motor main shaft 16, a pair of middle round nuts 22 are arranged on the middle part, and the shaft sleeve group 17 is arranged between the adjacent impeller assemblies 2 and the guide vane assemblies 3 on the motor main shaft 16, through the arrangement of the round nuts and the shaft sleeve group 17, the position stability of the upper part of the main shaft is enhanced, the operation efficiency is improved, and the energy consumption is reduced.

[0030] In the embodiment, the bearing assembly is arranged on the first and third guide vane assemblies 3, the bearing assembly comprises the deep groove ball bearing 21, the bearing end cover 19 and the oil seal structure 20, the deep groove ball bearing 21 is embedded and arranged in the middle part of the guide vane inner shell 12, the oil seal structure 20 and the bearing end cover 19 are arranged on the two sides of the deep groove ball bearing 21, and the motor main shaft 16 is movably arranged in the deep groove ball bearing 21, so that the rotating resistance of the main shaft is reduced, and the operation efficiency is improved.

[0031] It should be noted that the above embodiment is only a preferred embodiment of the utility model, and is not used to limit the protection scope of the utility model, and the equivalent transformation made on the basis of the above embodiment all belongs to the protection scope of the utility model.

Claims

1. A multi-stage fan with noise reduction structure, comprising a fan housing, a driving motor, a motor spindle, an impeller assembly and a guide vane assembly, characterized in that: The fan shell comprises an integral outer shell, a sound insulation layer and an inner shell layer, the sound insulation layer is a composite layer of external sound insulation cotton and internal damping material, a noise reduction structure is formed between the outer shell and the inner shell by the sound insulation layer, the inner shell is assembled by the guide vane shells of the respective guide vane assemblies, the number of the impeller assemblies and the guide vane assemblies is two or more, the impeller assembly comprises an integrally formed impeller shell and impeller blades, the guide vane assembly comprises an integrally formed guide vane inner shell, guide vane blades and a guide vane shell, a driving motor is installed in the guide vane shell of the middle guide vane assembly, a motor main shaft is installed in the driving motor, the motor main shaft penetrates the guide vane inner shell and is integrally installed with the impeller assembly, the air flow channels of the respective impeller assemblies and guide vane assemblies are in communication with each other, the driving motor drives the motor main shaft to rotate and drives the impeller assembly to rotate synchronously to send the air flow axially.

2. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: The inner shell is provided with annular connecting plates on both sides, the annular connecting plates are embedded between the inner shell and the outer shell, and the annular connecting plates and the inner shell are integrally fastened and installed by bolt assemblies.

3. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: The outer shell is provided with two end flanges on both sides, the end flanges and the outer shell are integrally fastened and installed by bolt assemblies.

4. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: The outer shell is integrally formed with a base at the bottom and is provided with a motor wiring port and two lifting rings at the top.

5. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: The number of the impeller assemblies and the guide vane assemblies is four, the impeller assemblies are divided into first-stage impellers, second-stage impellers, third-stage impellers and fourth-stage impellers, the guide vane assemblies are divided into first-stage guide vanes, second-stage guide vanes, third-stage guide vanes and fourth-stage guide vanes, and the respective impeller assemblies and guide vane assemblies are arranged in sequence along the length direction of the motor main shaft.

6. The multi-stage fan with noise reduction structure according to claim 5, characterized in that: An arc-shaped air inlet cover is installed on the first-stage impeller assembly, and a guide vane cover plate is installed on the last-stage guide vane assembly.

7. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: The respective blade structures, numbers and sizes of the impeller assemblies are the same, the respective blade structures, numbers and sizes of the guide vane assemblies are the same, the numbers of the blades of the impeller assemblies and the guide vane assemblies are prime numbers and are staggered, and gaps exist between adjacent impeller assemblies and guide vane assemblies.

8. The multi-stage fan with noise reduction structure according to claim 1, characterized in that: Bolt mounting holes are arranged in a circular manner on the outer circumference of the guide vane shell of each guide vane assembly, and adjacent guide vane shells are fastened and assembled by bolt assemblies.

9. The multi-stage fan with noise reduction structure according to claim 1, wherein: A pair of end face round nuts are installed on the left and right sides of the motor main shaft, a pair of middle round nuts are installed in the middle, and a shaft sleeve group is arranged between adjacent impeller assemblies and guide vane assemblies on the motor main shaft.

10. A multi-stage fan with noise reduction structure according to any one of claims 1 to 9, characterized in that: A bearing assembly is installed on at least one guide vane assembly, the bearing assembly comprises a deep groove ball bearing, a bearing end cover and an oil seal structure, the deep groove ball bearing is embedded and installed in the middle of the guide vane inner shell, the oil seal structure and the bearing end cover are installed on the left and right sides of the deep groove ball bearing, and the motor main shaft is horizontally movably installed in the deep groove ball bearing.

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