Efficient low-noise single-motor double-impeller ventilator

Abstract

The invention belongs to the technical field of ventilators, and particularly discloses an efficient low-noise single-motor double-impeller ventilator which comprises a shell and a silencing module, a double-shaft-extension motor is arranged in the shell, impeller shells are fixedly connected to the two ends of the shell, and an inlet silencing shell is fixedly connected to the other side of one impeller shell; by arranging the silencing module, noise generated in the using process of the fan can be effectively reduced, pneumatic noise is reduced through the optimized fan flow channel structure and the fan blade shape, multiple noise reduction treatment can be conducted on the generated noise under the action of the silencing module in the airflow guiding-in process, noise transmission is reduced, and the noise reduction effect is improved. The first protrusions and the second protrusions are arranged to form an uneven reflecting surface, so that sound waves are scattered after making contact with the uneven reflecting surface, the effect of noise reduction treatment is achieved in the mode that the scattered sound waves consume energy mutually, and an environment-friendly and suitable low-noise working environment is achieved in the using process.

Description

Technical Field

[0001] The present invention belongs to the technical field of ventilators, and specifically discloses an efficient and low-noise single-motor double-impeller ventilator. Background Art

[0002] The noise of a ventilator includes mechanical noise, electromagnetic noise, and aerodynamic noise. Among them, mechanical noise and electromagnetic noise are relatively small under normal operating conditions, while aerodynamic noise is the main part and the most difficult to control. During the operation of the fan, air will form an air flow and quickly enter the interior of the fan. During this process, the air flow contacts and rubs against the inner wall of the fan inlet housing, generating noise. Traditional ventilators mainly use sound-absorbing cotton for sound insulation treatment, but this method has poor noise reduction effect. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to propose an efficient and low-noise single-motor double-impeller ventilator to solve the problem of poor noise reduction effect in the prior art.

[0004] To achieve the above purpose, the present invention provides an efficient and low-noise single-motor double-impeller ventilator, including a housing and a sound-absorbing module. A double-shaft extension motor is arranged inside the housing. Impeller housings are fixedly connected to both ends of the housing. An inlet sound-absorbing housing is fixedly connected to the other side of one of the impeller housings, and an outlet sound-absorbing housing is fixedly connected to the other side of the other impeller housing. A first-stage impeller located inside one of the impeller housings is arranged on one output shaft of the double-shaft extension motor, and a second-stage impeller located inside the other impeller housing is arranged on the other output shaft of the double-shaft extension motor. The rotation directions of the first-stage impeller and the second-stage impeller are the same; Among them, the sound-absorbing module includes an air inlet flow guide cover arranged inside the inlet sound-absorbing housing, an air outlet flow guide cover is arranged inside the outlet sound-absorbing housing, and a sound-absorbing component is arranged on the side of the inlet sound-absorbing housing away from the impeller housing; The sound-absorbing component includes a mounting housing fixedly connected to the surface of the inlet sound-absorbing housing. Filter holes evenly distributed are formed on the surface of the mounting housing. A fixed housing is fixedly connected to the inner side of the mounting housing. A mounting cavity is formed on the surface of the fixed housing, and an auxiliary component is arranged on the surface of the mounting housing.

[0005] In the above technical solution, preferably, two partition rings are fixedly connected to the inner wall of the mounting cavity. A sound-absorbing cavity is formed between the two partition rings, and a discharge cavity is formed between the inner partition ring and the inner wall of the mounting cavity.

[0006] In the above technical solution, preferably, evenly distributed partition bars are fixedly connected to the outer side of the outer partition ring, the outer sides of the partition bars are fixedly connected to the inner wall of the installation shell, an inlet cavity is formed between two partition bars, uniformly distributed inlet pipes are arranged inside the sound absorption cavity, one end of each inlet pipe penetrates through the sound absorption cavity and communicates with the adjacent inlet cavity, and the other end of each inlet pipe communicates with the discharge cavity.

[0007] In the above technical solution, preferably, evenly distributed outlet pipes are arranged inside the fixed shell, one end of each outlet pipe communicates with the discharge cavity, the outlet pipes and the inlet pipes are arranged in a staggered manner, and arc-shaped surfaces are arranged on the inner sides of the two open ends of each outlet pipe.

[0008] In the above technical solution, preferably, sound absorption holes evenly distributed and communicating with the sound absorption cavity are formed in the surface of each inlet pipe, and uniformly distributed first protrusions are arranged on the inner wall of the sound absorption cavity.

[0009] In the above technical solution, preferably, uniformly distributed second protrusions are arranged on the inner wall of the discharge cavity, and the second protrusions correspond to the positions of the inlet pipes. Both the first protrusions and the second protrusions are made of sound absorption cotton material.

[0010] In the above technical solution, preferably, sound insulation cotton is arranged on the surfaces of both the inlet sound absorption shell and the outlet sound absorption shell.

[0011] In the above technical solution, preferably, the auxiliary assembly includes two mounting rings fixedly connected to the surface of the installation shell and symmetrically distributed. A sliding shell is arranged between the two mounting rings. An inlet groove is formed at the bottom of the sliding shell. The bottom of the sliding shell is in contact with the surface of the installation shell. Two magnets symmetrically distributed are embedded at the bottom of the sliding shell. A sticking roller is arranged inside the sliding shell. A motor is arranged inside one of the mounting rings. The output shaft of the motor is fixedly connected to one end of the sticking roller. The other end of the sticking roller penetrates through the inside of the other mounting ring and is fixedly connected to a gear. A toothed ring is fixedly connected to the inner wall of the other mounting ring. The gear is meshed with the toothed ring.

[0012] In the above technical solution, preferably, the auxiliary assembly further includes a plurality of connecting bars arranged inside the installation shell. Evenly distributed ejector rods are fixedly connected to the surfaces of the connecting bars. The ejector rods correspond to the positions of the filter holes, and the diameter of each ejector rod is smaller than the aperture of the filter hole. The connecting bars are made of iron metal material.

[0013] In the above technical solution, preferably, springs are fixedly connected to the surfaces of the connecting bars, and the other ends of the springs are fixedly connected to the inside of the installation shell.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting up a silencing module, the noise generated during the operation of the fan can be effectively reduced. Through the optimized fan flow channel structure and fan blade profile, the aerodynamic noise is reduced. During the air flow introduction process, under the action of the silencing component, the generated noise can be subjected to multiple noise reduction treatments, reducing the noise transmission. By using the first protrusion and the second protrusion to form an uneven reflecting surface, the sound wave will scatter after contacting it, and the noise reduction effect is achieved by the form of the scattered sound waves consuming energy with each other, realizing an environmentally friendly and suitable low-noise working environment during use.

[0015] By setting up an auxiliary component, the filter holes can be cleaned well, reducing the situation where the ventilation effect is affected or even noise is caused due to the blockage of the filter holes. By starting the motor, the adhesion roller can be driven to rotate. Under the mutual cooperation of the gear and the toothed ring, the sliding shell can be driven to rotate along the surface of the installation shell. During this process, in cooperation with the spring, the connecting bar, the magnet and the ejector rod, the filter holes can be dredged, reducing the occurrence of blockage.

[0016] The inlet silencing shell and the outlet silencing shell are set in a way without an inner cylinder. This way can reduce the flow channel wind resistance, improve the fan efficiency, effectively reduce the fan noise, and can directly cool the double-shaft extension motor during the gas flow process, effectively improving the service life of the motor. There is no need to set up a cooling fan, reducing the overall weight of the device.

[0017] Adopting a single-motor and double-impeller mode, the two-stage impellers rotate in the same direction, which is energy-efficient. This structure effectively reduces the external dimension of the fan, reduces the weight, and is convenient for handling, installation, disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic cross-sectional diagram of the present invention; Figure 3 is a schematic structural diagram of the installation shell of the present invention; Figure 4 is a schematic structural diagram of the silencing component of the present invention; Figure 5 is a schematic distribution diagram of the partition ring, the fixed shell and the inlet pipe of the present invention; Figure 6 is Figure 5 an enlarged view of A in Figure 7 is a partial schematic diagram of the auxiliary component of the present invention; Figure 8 is Figure 7 an enlarged view of B in

[0019] In the figure: 1. Outer shell; 101. Impeller housing; 102. Inlet silencing housing; 103. Sound insulation cotton; 104. Outlet silencing housing; 2. Silencing component; 201. Installation housing; 202. Partition ring; 203. Partition bar; 204. Inlet pipe; 205. Silencing cavity; 206. First protrusion; 207. Second protrusion; 208. Outlet pipe; 210. Fixed housing; 3. Double-shaft extension motor; 4. Primary impeller; 5. Secondary impeller; 6. Inlet air guide cover; 7. Outlet air guide cover; 8. Auxiliary component; 801. Installation ring; 802. Motor; 803. Adhesion roller; 804. Tooth ring; 805. Gear; 806. Sliding housing; 807. Connecting bar; 808. Jack; 809. Spring; 810. Magnet. Detailed implementation mode

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0021] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed below.

[0022] As Figures 1 - 8 shown, a high-efficiency and low-noise single-motor double-impeller ventilator includes an outer shell 1 and a silencing module. A double-shaft extension motor 3 is arranged inside the outer shell 1. Impeller housings 101 are fixedly connected to both ends of the outer shell 1. An inlet silencing housing 102 is fixedly connected to the other side of one of the impeller housings 101, and an outlet silencing housing 104 is fixedly connected to the other side of the other impeller housing 101. A primary impeller 4 located inside one of the impeller housings 101 is arranged on one output shaft of the double-shaft extension motor 3, and a secondary impeller 5 located inside the other impeller housing 101 is arranged on the other output shaft of the double-shaft extension motor 3. The rotation directions of the primary impeller 4 and the secondary impeller 5 are the same; Among them, the silencing module includes an inlet air guide cover 6 arranged inside the inlet silencing housing 102, an outlet air guide cover 7 is arranged inside the outlet silencing housing 104, and a silencing component 2 is arranged on the side of the inlet silencing housing 102 away from the impeller housing 101; The silencing component 2 includes an installation housing 201 fixedly connected to the surface of the inlet silencing housing 102. Filter holes are evenly distributed on the surface of the installation housing 201. A fixed housing 210 is fixedly connected to the inner side of the installation housing 201. An installation cavity is opened on the surface of the fixed housing 210, and an auxiliary component 8 is arranged on the surface of the installation housing 201.

[0023] By starting the double-axle extension motor 3, the two output shafts can synchronously drive the primary impeller 4 and the secondary impeller 5 to rotate. Specifically, the blade angles on the primary impeller 4 and the secondary impeller 5 are adjustable structures, and the fan performance parameters can be adjusted by adjusting the blade angles. The blade surface is treated with low-adhesion spraying, which is not easy to accumulate dirt and dust. A single motor and double impeller mode is adopted, and the two-stage impellers have the same rotation direction, which is highly efficient and energy-saving.

[0024] like Figures 1 - 8 As shown, two separation rings 202 are fixedly connected to the inner wall of the installation cavity, a silencer cavity 205 is formed between the two separation rings 202, and a discharge cavity is formed between the inner separation ring 202 and the inner wall of the installation cavity.

[0025] The outer side of the outer dividing ring 202 is fixedly connected with evenly distributed dividing strips 203, and the outer side of the dividing strips 203 is fixedly connected to the inner wall of the mounting shell 201. An inlet cavity is formed between the two dividing strips 203. The interior of the silencer cavity 205 is provided with evenly distributed inlet pipes 204. One end of the inlet pipe 204 passes through the silencer cavity 205 and is connected with the adjacent inlet cavity, and the other end of the inlet pipe 204 is connected with the discharge cavity.

[0026] The inner side of the fixed shell 210 is provided with evenly distributed outlet pipes 208 , one end of which is connected to the discharge cavity, and the outlet pipes 208 are staggered with the inlet pipes 204 , and the inner sides of the openings at both ends of the outlet pipes 208 are both provided with arc surfaces.

[0027] The airflow is introduced into the installation cavity through the filter hole. In this process, the filter hole can filter the dust and impurities from the outside, reduce the impact of dust and impurities entering the body, and reduce the noise caused by dust and impurities adhering to the surface of the blades after long-term use, thereby reducing the generation of noise and achieving the effect of noise reduction; Under the setting of the dividing strip 203, the noise generated by the friction between the airflow and the inner wall of the filter hole during the process of the airflow passing through the filter hole quickly will be introduced into the interior of the discharge chamber through the inlet chamber together with the airflow through the inlet pipe 204. In this process, the sound waves of some noises will be transmitted to the interior of the silencer chamber 205 through the silencer hole to achieve the effect of preliminary silencer. After the noise is transmitted through the outlet pipe 208, it can collide with the inner wall of the discharge chamber and reflect. The reflected noise can offset the subsequent noise and consume energy to achieve the effect of noise reduction, which further improves the noise reduction effect of the device. Finally, the airflow entering the discharge chamber can be discharged into the interior of the inlet silencer shell 102 through the outlet pipe 208, guided by the action of the air inlet guide cover 6, transported by the joint action of the first-stage impeller 4 and the second-stage impeller 5, and discharged through the outlet silencer shell 104 under the action of the air outlet guide cover 7. In this process, the air inlet guide cover 6 and the air outlet guide cover 7 can guide it to reduce the noise generated by friction. Moreover, the inlet silencing housing 102 and the outlet silencing housing 104 are arranged in a manner without an inner cylinder. This manner can reduce the flow path wind resistance, improve the fan efficiency, effectively reduce the fan noise, and can directly cool the double-shaft extension motor 3 during the gas flow process, effectively increasing the service life of the motor. There is no need to set up a cooling fan, reducing the overall weight of the device.

[0028] As Figures 1 - 8 shown, the surface of the inlet pipe 204 is provided with evenly distributed sound-absorbing holes communicating with the sound-absorbing cavity 205, and the inner wall of the sound-absorbing cavity 205 is provided with evenly distributed first protrusions 206.

[0029] The inner wall of the discharge cavity is provided with evenly distributed second protrusions 207, and the second protrusions 207 correspond to the position of the inlet pipe 204. Both the first protrusions 206 and the second protrusions 207 are made of sound-absorbing cotton material.

[0030] Sound-insulating cotton 103 is provided on the surfaces of both the inlet silencing housing 102 and the outlet silencing housing 104.

[0031] The setting of the first protrusions 206 can make the inner wall of the sound-absorbing cavity 205 form an uneven effect. Thus, when sound waves are introduced into the inner wall of the sound-absorbing cavity 205 through the sound-absorbing holes, scattering can occur under the action of the uneven inner wall. The scattered sound waves cross each other to achieve mutual energy consumption, effectively improving the noise reduction effect and further reducing the transmission of noise. The setting of the second protrusions 207 can directly contact the second protrusions 207 when sound waves are transmitted through the inlet pipe 204. The second protrusions 207 can make the contact range also form an uneven reflection surface, achieving mutual energy consumption through the scattering phenomenon. And since both the second protrusions 207 and the first protrusions 206 are made of sound-absorbing cotton material, and during the process of the air flow discharging through the inlet pipe 204, the air flow can compress the second protrusions 207, making the reflection surface formed by the second protrusions 207 rougher, strengthening the scattering effect on sound waves and improving the noise reduction effect.

[0032] The setting that both the first protrusions 206 and the second protrusions 207 are made of sound-absorbing cotton material can achieve the effect of absorbing noise when sound waves contact them, strengthening the noise reduction effect. And the arc surface provided on the inner side of the opening of the outlet pipe 208 can facilitate the discharge of the air flow and reduce the noise generated by the friction during the rapid movement of the air flow.

[0033] As Figures 1 - 8As shown in the figure, the auxiliary component 8 includes two mounting rings 801 fixedly connected to the surface of the mounting shell 201 and symmetrically distributed. A sliding shell 806 is arranged between the two mounting rings 801. An inlet groove is formed at the bottom of the sliding shell 806. The bottom of the sliding shell 806 is in contact with the surface of the mounting shell 201. Two symmetrically distributed magnets 810 are embedded at the bottom of the sliding shell 806. A sticking roller 803 is arranged inside the sliding shell 806. A motor 802 is arranged inside one of the mounting rings 801. The output shaft of the motor 802 is fixedly connected to one end of the sticking roller 803. The other end of the sticking roller 803 penetrates into the inside of the other mounting ring 801 and is fixedly connected to a gear 805. A toothed ring 804 is fixedly connected to the inner wall of the other mounting ring 801. The gear 805 is meshed with the toothed ring 804.

[0034] The auxiliary component 8 further includes a plurality of connecting bars 807 arranged inside the mounting shell 201. The surface of the connecting bar 807 is fixedly connected with evenly distributed ejector rods 808. The ejector rods 808 correspond to the positions of the filter holes, and the diameter of the ejector rods 808 is smaller than the aperture of the filter holes. The connecting bar 807 is made of ferrous metal material.

[0035] A spring 809 is fixedly connected to the surface of the connecting bar 807. The other end of the spring 809 is fixedly connected to the inside of the mounting shell 201.

[0036] By starting the motor 802, the sticking roller 803 can be driven to rotate. During this process, the gear 805 can be driven to rotate synchronously. Due to the setting of the toothed ring 804, the sticking roller 803 can rotate around the toothed ring 804 during the rotation of the gear 805, so as to drive the sliding shell 806 to rotate along the surface of the mounting shell 201. The sliding shell 806 can block the filter holes so that the outside air cannot flow through the blocked filter holes at this time, thereby reducing the influence of the air flow on the cleaning of impurities. The setting of the magnets 810 can adsorb the connecting bar 807 made of ferrous metal material by the magnets 810 during the movement of the mounting shell 201, so that the connecting bar 807 moves towards the mounting shell 201 against the elastic force of the spring 809. During this process, the ejector rod 808 can be driven to dredge the filter holes, reducing the situation of blockage affecting the use of the device. At the same time, since the ejector rod 808 passes through the filter holes, the impurities can be pushed to contact the surface of the sticking roller 803, thereby achieving the effect of using the sticking roller 803 to stick the impurities and reducing the situation that the impurities adhere to the surface of the mounting shell 201 and affect the subsequent ventilation effect. When the sliding shell 806 slides to the position where the next filter hole is opened, the connecting bar 807 adsorbed by the magnets 810 before can be driven to reset under the action of the spring 809, facilitating the subsequent normal flow of air through the dredged filter holes.

[0037] Working principle: By starting the double-shaft extension motor 3, the two output shafts can drive the first-stage impeller 4 and the second-stage impeller 5 to rotate synchronously. Specifically, the blade angles on the first-stage impeller 4 and the second-stage impeller 5 are adjustable structures, and the performance parameters of the fan can be adjusted by adjusting the blade angles. The blade surfaces are treated with low-adhesion spraying, which is not easy to accumulate dirt and dust. The single-motor and double-impeller mode is adopted, and the two-stage impellers rotate in the same direction, which is energy-efficient. The air flow is introduced into the interior of the installation cavity through the filter holes. During this process, the filter holes can filter out dust and impurities in the outside world, reducing the impact of dust and impurities entering the interior of the machine. The noise generated by the air flow rubbing against the inner wall of the filter holes during the rapid passing through the filter holes will be introduced into the interior of the discharge cavity through the introduction cavity and the introduction pipe 204 along with the air flow. During this process, part of the sound waves of the noise will be transmitted to the interior of the sound-absorbing cavity 205 through the sound-absorbing holes to achieve the effect of preliminary sound absorption. After the noise is transmitted through the export pipe 208, it can collide with the inner wall of the discharge cavity and be reflected. The reflected noise can cancel out with the subsequent noise to consume energy mutually and achieve the effect of noise reduction, further improving the noise reduction effect of the device. Finally, the air flow entering the interior of the discharge cavity can be discharged through the export pipe 208 into the interior of the inlet sound-absorbing shell 102, and is guided under the action of the air inlet guide cover 6. It is conveyed by the combined action of the first-stage impeller 4 and the second-stage impeller 5 and discharged through the outlet sound-absorbing shell 104 under the action of the air outlet guide cover 7. During this process, the air inlet guide cover 6 and the air outlet guide cover 7 can guide it to reduce the noise generated by friction. The setting of the first protrusion 206 can make the inner wall of the sound-absorbing cavity 205 form an uneven effect. Therefore, when the sound wave is introduced into the inner wall of the sound-absorbing cavity 205 through the sound-absorbing hole, it can scatter under the action of the uneven inner wall. The scattered sound waves cross each other to consume energy mutually, effectively improving the noise reduction effect and further reducing the transmission of noise. The setting of the second protrusion 207 can directly contact the second protrusion 207 when the sound wave is transmitted through the introduction pipe 204, and the second protrusion 207 can also form an uneven reflection surface in the contact range. The energy is consumed mutually through the scattering phenomenon. And because both the second protrusion 207 and the first protrusion 206 are made of sound-absorbing cotton materials, and during the process of discharging the air flow through the introduction pipe 204, the air flow can compress the second protrusion 207, making the reflection surface formed by the second protrusion 207 rougher, strengthening the scattering effect on the sound wave and improving the noise reduction effect.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency, low-noise single-motor double-impeller fan, comprising a housing (1) and a silencer module, characterized in that: A double-axle motor (3) is arranged inside the housing (1), and both ends of the housing (1) are fixedly connected to an impeller shell (101), the other side of one of the impeller shells (101) is fixedly connected to an inlet silencer shell (102), and the other side of the other impeller shell (101) is fixedly connected to an outlet silencer shell (104), an output shaft of the double-axle motor (3) is provided with a first-stage impeller (4) located inside one of the impeller shells (101), and the other output shaft of the double-axle motor (3) is provided with a second-stage impeller (5) located inside the other impeller shell (101), and the first-stage impeller (4) and the second-stage impeller (5) have the same rotation direction; The silencer module comprises an air inlet guide cover (6) arranged inside the inlet silencer housing (102), an air outlet guide cover (7) is arranged inside the outlet silencer housing (104), and a silencer assembly (2) is arranged on a side of the inlet silencer housing (102) away from the impeller housing (101); The silencer assembly (2) comprises a mounting shell (201) fixedly connected to the surface of an inlet silencer shell (102), the surface of the mounting shell (201) being provided with evenly distributed filter holes, a fixing shell (210) being fixedly connected to the inner side of the mounting shell (201), a mounting cavity being provided on the surface of the fixing shell (210), and an auxiliary assembly (8) being arranged on the surface of the mounting shell (201).

2. The high-efficiency, low-noise single-motor double-impeller fan according to claim 1, characterized in that: Two separation rings (202) are fixedly connected to the inner wall of the installation cavity, a silencer cavity (205) is formed between the two separation rings (202), and a discharge cavity is formed between the inner separation ring (202) and the inner wall of the installation cavity.

3. The high-efficiency, low-noise single-motor double-impeller fan according to claim 2, characterized in that: The outer side of the outer dividing ring (202) is fixedly connected to evenly distributed dividing strips (203), the outer side of the dividing strips (203) is fixedly connected to the inner wall of the mounting shell (201), an inlet cavity is formed between the two dividing strips (203), and evenly distributed inlet pipes (204) are arranged inside the silencer cavity (205), one end of the inlet pipe (204) passes through the silencer cavity (205) and is connected to the adjacent inlet cavity, and the other end of the inlet pipe (204) is connected to the discharge cavity.

4. The high-efficiency, low-noise single-motor double-impeller fan according to claim 3, characterized in that: Evenly distributed outlet pipes (208) are arranged on the inner side of the fixed shell (210), one end of the outlet pipe (208) is connected to the discharge cavity, and the outlet pipe (208) and the inlet pipe (204) are staggeredly distributed, and arc surfaces are arranged on the inner sides of the openings at both ends of the outlet pipe (208).

5. The high-efficiency, low-noise single-motor double-impeller fan according to claim 4, characterized in that: The surface of the introduction tube (204) is provided with evenly distributed silencing holes which are in communication with the silencing cavity (205), and the inner wall of the silencing cavity (205) is provided with evenly distributed first protrusions (206).

6. The high-efficiency, low-noise single-motor double-impeller fan according to claim 5, characterized in that: The inner wall of the discharge cavity is provided with evenly distributed second protrusions (207), and the second protrusions (207) correspond to the positions of the introduction tube (204), and the first protrusions (206) and the second protrusions (207) are both components made of sound-absorbing cotton material.

7. The high-efficiency, low-noise single-motor double-impeller fan according to claim 1, characterized in that: The surfaces of the inlet silencer shell (102) and the outlet silencer shell (104) are both provided with sound insulation cotton (103).

8. The high-efficiency, low-noise single-motor double-impeller fan according to claim 1, characterized in that: The auxiliary component (8) comprises two mounting rings (801) fixedly connected to the surface of the mounting shell (201) and symmetrically distributed, a sliding shell (806) is arranged between the two mounting rings (801), a guide groove is opened at the bottom of the sliding shell (806), the bottom of the sliding shell (806) contacts the surface of the mounting shell (201), two magnets (810) symmetrically distributed are embedded and installed at the bottom of the sliding shell (806), an adhesion roller (803) is arranged inside the sliding shell (806), a motor (802) is arranged inside the mounting ring (801) on one side, an output shaft of the motor (802) is fixedly connected to one end of the adhesion roller (803), the other end of the adhesion roller (803) passes through the inside of another mounting ring (801) and is fixedly connected to a gear (805), and the inner wall of the other mounting ring (801) is fixedly connected to a gear ring (804), and the gear (805) is meshingly connected to the gear ring (804).

9. The high-efficiency, low-noise single-motor double-impeller fan according to claim 1, characterized in that: The auxiliary component (8) further comprises a plurality of connecting strips (807) arranged on the inner side of the mounting shell (201); evenly distributed top rods (808) are fixedly connected to the surface of the connecting strips (807); the top rods (808) correspond to the positions of the filter holes, and the diameter of the top rods (808) is smaller than the aperture of the filter holes; the connecting strips (807) are iron metal material components.

10. The high-efficiency, low-noise single-motor double-impeller fan according to claim 9, characterized in that: A spring (809) is fixedly connected to the surface of the connecting strip (807), and the other end of the spring (809) is fixedly connected to the inner side of the mounting shell (201).

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