CN220937799U - Noise-reducing food processor - Google Patents

Abstract

The application discloses a noise-reducing food processor, which comprises a host machine and a cup body assembly arranged on the host machine, wherein a motor for driving a crushing cutter of the cup body assembly to work is arranged in the host machine, an air outlet channel communicated with the outside is further arranged in the host machine, a plurality of noise-reducing air channels are arranged in the air outlet channel in parallel, each noise-reducing air channel is internally provided with an air guide column, each noise-reducing air channel comprises a main air channel, two side air channels and a converging air channel, the two side air channels are respectively arranged on two sides of the air guide column, the main air channel is respectively communicated with one ends of the two side air channels, and the other ends of the two side air channels are respectively communicated with the converging air channels. According to the food processor disclosed by the application, when the motor radiates air, in the process of exhausting the air along the plurality of noise reduction air channels, the air flows are converged after flowing along the two side air channels, and the opposite phase sound waves can be mutually counteracted by utilizing the opposite flow directions of the air flows, so that interference silencing is realized, the noise transmitted from the noise reduction air channels is reduced, and the radiating effect of the motor can be ensured.

Description

Noise-reducing food processor

Technical Field

The utility model relates to the field of household appliances, in particular to a noise-reducing food processor.

Background

At present, domestic broken wall machine noise on the market is big a big pain point of user, because the motor continuous operation can lead to motor temperature to rise in the machine operation process, for motor heat dissipation, broken wall machine is equipped with the heat dissipation wind channel and realizes motor heat dissipation, avoids the high temperature of motor to influence its use and life-span. However, in the existing heat dissipation air duct, the motor is usually accompanied by larger noise transmission while dissipating heat, which causes poor user experience. Some broken wall machines are in order to solve the big problem of above-mentioned noise, set up a plurality of posts that keep out the wind in the position that the air-out passageway of heat dissipation wind channel is close to the air outlet to increase the reflection of noise, interfere, thereby consume the acoustic energy and promote noise reduction effect, however, the existence of post that keeps out the wind blocks a part of hot-blast normal discharge easily, and has increased the windage, can influence the radiating effect, thereby make motor heat dissipation and noise reduction unable compromise.

Disclosure of utility model

The utility model provides a noise-reducing food processor, which aims to solve the technical problem that heat dissipation and noise reduction of a motor of a wall breaking machine are difficult to be compatible in the prior art, and optimize the internal structure of a heat dissipation air duct on the premise of not influencing the heat dissipation effect of the motor so as to solve the problem of high noise of air outlet.

The utility model discloses a noise-reducing food processor, which comprises a host and a cup body assembly arranged on the host, wherein a motor for driving a crushing cutter of the cup body assembly to work is arranged in the host, the host is also provided with an air outlet channel communicated with the outside, a plurality of noise-reducing air channels are arranged in the air outlet channel in parallel, each noise-reducing air channel is internally provided with an air guide column, each noise-reducing air channel comprises a main air channel, two side air channels and a converging air channel, the two side air channels are respectively arranged on two sides of the air guide column, the main air channel is respectively communicated with one ends of the two side air channels, and the other ends of the two side air channels are respectively communicated with the converging air channels.

The noise-reducing food processor of the utility model also has the following additional technical characteristics:

The two side air channels are symmetrically arranged relative to the central line of the noise reduction air channel.

The wind-guiding post orientation the one end of main wind channel is equipped with the tip, the wind-guiding post orientation the other end of converging the wind channel is equipped with circular arc portion, two the side wind channel is in the tip forms first contained angle, two the side wind channel is in circular arc portion forms the second contained angle, first contained angle is less than the second contained angle.

The second included angle is an obtuse angle.

The second included angle is 135 degrees to 180 degrees.

At least two air guide columns are arranged in the noise reduction air duct.

The air guide columns in the adjacent two noise reduction air channels are arranged in a staggered mode.

The host is provided with an air outlet which is used for communicating the air outlet channel with the outside, and a buffer cavity is arranged between the outlet of the noise reduction air channel and the air outlet.

The host is provided with an air outlet which is communicated with the air outlet channel and the outside, the air outlet comprises a plurality of grid-shaped air outlet holes, and the outlets of the noise reduction air channels are arranged in a staggered mode with the air outlet holes.

The host comprises a shell, a motor cover arranged in the shell and an air duct cover arranged at the bottom of the shell, wherein the motor cover surrounds the outer side of the motor, the air duct cover and the bottom of the shell enclose to form an air outlet channel, and a plurality of noise reduction air ducts are arranged at the bottom of the shell or on the air duct cover.

By adopting the technical scheme, the utility model has the following beneficial effects:

1. According to the noise-reducing food processor, the plurality of noise-reducing air channels are arranged in the air outlet channel, when the motor radiates air, air flows are converged after flowing along the two side air channels in the process of exhausting the air flow along the plurality of noise-reducing air channels, and the opposite phase sound waves can be mutually offset by utilizing the opposite flow directions of the air flows, so that interference noise reduction is realized, the noise transmitted from the noise-reducing air channels is reduced, the user experience is improved, and meanwhile, certain flow channels are formed on two sides of the air guide column, so that the exhaust of the air flows is not influenced, and the heat radiation effect of the motor is ensured.

2. As a preferred embodiment, the two side air channels are symmetrically arranged relative to the central line of the noise reduction air channel; by adopting the symmetrical side air channels, the air flow in the main air channel is divided into two uniform branch air flows which flow along the two side air channels respectively, the flow and the flow speed of the two branch air flows are more uniform, and more effective convection is facilitated when the two branch air flows are converged, so that interference of sound waves with opposite phases is enhanced, consumption of noise energy is increased, and noise reduction effect is improved.

As a preferred example of the present embodiment, one end of the air guiding column facing the main air duct is provided with a tip, the other end of the air guiding column facing the converging air duct is provided with an arc portion, the two side air ducts form a first included angle at the tip, the two side air ducts form a second included angle at the arc portion, and the first included angle is smaller than the second included angle; from this, can take place after the air current flows into main wind channel and the intercommunication department of side air channel and shunt fast and form two branch airflows to flow along two side air channels respectively, afterwards, two branch airflows that flow by two side air channels can take place the hedging in the intercommunication department of side air channel and confluence wind channel to the sound wave that the phase place is opposite interferes, offset each other, through optimizing first contained angle and second contained angle, is favorable to optimizing noise reduction effect when guaranteeing exhaust efficiency.

Further, the second included angle is an obtuse angle; therefore, the two branch airflows can generate effective opposite-phase sound waves to interfere and offset each other, so that the silencing reliability is ensured.

Further, the second included angle is 135 degrees to 180 degrees; when the second included angle is smaller than 135 degrees, the interference between the two branch airflows is reduced, which is not beneficial to silencing; when the second included angle is equal to 180 degrees, the opposite impact effect of the two branch airflows is best, so that the noise reduction is facilitated, and the noise reduction effect can be improved.

3. As a preferred embodiment, at least two air guide columns are arranged in the noise reduction air duct; the number of the air guide columns in the same noise reduction air duct is not less than two, so that the air flow can be split and converged for multiple times in the flowing process of the air flow along the noise reduction air duct, the times of noise cancellation interference of sound waves can be increased, and the air outlet noise reduction effect of a single noise reduction air duct can be improved.

4. As a preferred embodiment, the air guide columns in two adjacent noise reduction air channels are arranged in a staggered manner; therefore, the air guide columns are arranged in the mode, and the total number of the air guide columns can be increased on the premise that the width of the air outlet channel is certain, so that the flow splitting and converging times of air flows are increased, the frequency of sound wave offset interference is increased, and the overall air outlet noise reduction effect is improved.

5. As a preferred embodiment, the host is provided with an air outlet for communicating the air outlet channel with the outside, and a buffer cavity is arranged between the outlet of the noise reduction air channel and the air outlet; therefore, after the air flow flows out of the outlet of the noise reduction air duct, the air flow can enter the buffer cavity to reduce wind pressure and wind speed, so that the large noise caused by the fact that the wind speed is too large to strike the air outlet can be avoided, and the air outlet noise is further reduced.

6. As a preferred embodiment, the host is provided with an air outlet for communicating the air outlet channel with the outside, the air outlet comprises a plurality of grid-shaped air outlet holes, and the outlets of the noise reduction air channels are arranged in a staggered manner with the air outlet holes; through making the export and the apopore dislocation of wind channel of making an uproar mutually, can not directly blow after the export of wind channel of making an uproar falls in the air current outflow, avoided the wind noise of directly blowing big, and noise flow path extension is favorable to reducing the noise size that reaches apopore department to reduce the noise that passes in the user's ear, pleasant user's mood.

7. As a preferred embodiment, the host comprises a casing, a motor cover arranged in the casing and an air duct cover arranged at the bottom of the casing, wherein the motor cover surrounds the outer side of the motor, the air duct cover and the bottom of the casing are surrounded to form the air outlet channel, and a plurality of noise reduction air ducts are arranged at the bottom of the casing or on the air duct cover; the noise reduction air duct is flexible in arrangement position, can be arranged at the bottom of the machine shell and can also be arranged on the air duct cover, so that the structure configuration or processing is more flexible, the improvement on the basis of the existing structure is facilitated, and the adaptability and the universality are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

Fig. 1 is a schematic view of a food processor according to an embodiment of the present application.

Fig. 2 is a schematic cross-sectional view of the food processor of fig. 1.

Fig. 3 is a schematic top view illustrating an air outlet and its internal components according to an embodiment of the present application.

Fig. 4 is a schematic structural view of a single noise reduction duct according to an embodiment of the present application.

Fig. 5 is a schematic structural view of an air duct cover according to an embodiment of the present application.

Fig. 6 is a schematic distribution diagram of a noise reduction duct according to an embodiment of the present application.

Reference numerals:

10. a host; 11. a cup assembly; 12. a motor; 13. an air outlet channel; 14. a noise reduction air duct; 15. an air guide column; 141. a main air duct; 142. a side air duct; 143. merging air channels; 131. an arcuate channel; 132. a straight channel; 121. a heat radiation fan; 151. a tip portion; 152. an arc part; 16. a buffer chamber; 17. a wind shielding plate; 18. an air outlet hole; 101. a housing; 102. a base; 19. a motor cover; 20. and an air duct cover.

Detailed Description

In order to more clearly illustrate the general inventive concept, reference will be made in the following detailed description, by way of example, to the accompanying drawings.

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but that the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited by the specific embodiments disclosed below.

In addition, in the description of the present utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. However, it is noted that direct connection indicates that two connected bodies are not connected through a transition structure, but are connected through a connection structure to form a whole. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1 to 6, the application provides a noise-reducing food processor, which comprises a main machine 10 and a cup assembly 11 installed on the main machine 10, wherein a motor 12 for driving a crushing cutter of the cup assembly 11 to work is arranged in the main machine 10, the main machine 10 is also provided with an air outlet channel 13 communicated with the outside, a plurality of noise-reducing air channels 14 are arranged in parallel in the air outlet channel 13, an air guide column 15 is arranged in each noise-reducing air channel 14, the noise-reducing air channels 14 comprise a main air channel 141, two side air channels 142 and a converging air channel 143, the two side air channels 142 are respectively arranged on two sides of the air guide column 15, the main air channel 141 is respectively communicated with one ends of the two side air channels 142, and the other ends of the two side air channels 142 are respectively communicated with the converging air channel 143.

Although fig. 1 shows a type of machine in which the cup assembly 11 is detachable from the host 10, it is understood that the type of food processor of the present application further includes a hands-free wall breaking machine, with the heat dissipation air duct of the motor 12 being provided, so that the improved air outlet channel 13 of the present application has high adaptability and versatility. Specifically, the air outlet channel 13 is, for example, a structure disposed at the lower side of the motor 12, and during the heat dissipation process of the motor 12, the air flows around the motor 12, then flows downward into the air outlet channel 13, and finally is discharged from the air outlet of the host 10.

As shown in fig. 2 to 4, the air outlet passage 13 includes an arc-shaped passage 131 and a straight passage 132, the heat radiation fan 121 is provided in the arc-shaped passage 131, and the plurality of noise reduction air passages 14 are arranged at intervals along the width direction of the straight passage 132. Under the action of the cooling fan 121, the air flow rapidly flows into the straight channel 132 and flows through the plurality of noise reduction air channels 14, so that the reduction of air noise of the air outlet is realized on the basis of ensuring the cooling effect of the motor 12, the cooling of the motor 12 is considered, and the noise reduction performance of the machine is improved. When the air flows along the single noise reduction air duct 14, the air flows are divided into two branch air flows in the main air duct 141, the two branch air flows are converged after flowing along the side air duct 142 respectively, and the opposite phase sound waves can be mutually counteracted by utilizing the opposite flow directions of the air flows, so that interference silencing is realized, and the noise transmitted from the noise reduction air duct 14 is reduced.

As a preferred embodiment of the present application, the two side air channels 142 are symmetrically disposed about the midline of the noise reduction air channel 14.

Preferably, two symmetrical side air channels 142 are adopted, so that the air flow in the main air channel 141 is divided into two uniform branch air flows respectively along the two side air channels 142, the flow rates and the flow rates of the two branch air flows are uniform, more effective convection is facilitated when the two branch air flows are converged, interference of sound waves with opposite phases is enhanced, consumption of noise energy is increased, and accordingly noise reduction effect is improved.

When different configurations of the air guiding studs 15 are used, different flow passages may be formed. For example, when the air guiding post 15 is cylindrical, that is, when the cross section of the air guiding post 15 is circular, two arc-shaped side air channels 142 may be formed on two sides of the air guiding post 15. When the air guide column 15 is of a cylindrical structure shown in fig. 4 and the cross section of the air guide column 15 is in a water drop shape, the two side air passages 142 on two sides of the air guide column 15 comprise a straight air passage and an arc air passage, the front tip and the rear tip of the air guide column 15 are round, so that air flow is favorably and rapidly split to form two branch air flows to flow into the two side air passages 142, and the heat dissipation efficiency is improved.

In a preferred embodiment, one end of the air guiding post 15 facing the main air duct 141 is provided with a tip 151, the other end of the air guiding post 15 facing the converging air duct 143 is provided with an arc portion 152, the two side air ducts 142 form a first included angle at the tip 151, the two side air ducts 142 form a second included angle at the arc portion 152, and the first included angle is smaller than the second included angle.

As shown in fig. 4, the cross section of the air guiding column 15 is in a water drop shape, the front tip and the rear circle form a first included angle alpha, for example, is an acute angle, which is beneficial to the rapid diversion of the main air flow, and the two side air channels 142 approach each other in an arc shape when in the rear half section, so that conditions are provided for the opposite air flows to meet. The second included angle beta is an obtuse angle, so that the two branch airflows are opposite in opposite phases at the second included angle, so that sound waves with opposite phases interfere and cancel each other to carry out noise elimination.

As shown in fig. 6, the width of the main air duct 141 is W, and the width of the side air duct 142 is L, preferably W <2L, so that the width of the noise reduction air duct 14 becomes large and the wind resistance becomes small in the changing process, so that the heat dissipation is accelerated, and the beneficial effect of fast heat dissipation of the household wall breaking machine is achieved. W is preferably 2 to 3mm, more preferably 3mm. L is preferably 2 to 3mm, more preferably 2mm.

Further preferably, the second included angle β is 135 degrees to 180 degrees.

Specifically, the values of the second included angle include any one of 135 degrees, 180 degrees and 135 degrees to 180 degrees, and by adopting the second included angle in the range, a certain noise reduction effect can be ensured in the heat dissipation process of the motor 12, and the noise reduction effect is obvious.

As a preferred embodiment of the present application, at least two air guide posts 15 are provided in the noise reduction duct 14.

I.e. at least one noise reduction duct 14 is internally provided with two or more air guide posts 15. As shown in fig. 3 or fig. 6, in the same noise reduction duct 14, between two adjacent air guide columns 15, a converging duct 143 near a previous air guide column 15 may be multiplexed into a main duct 141 of a next air guide column 15, so that airflow is continuously split and converged, which is helpful for noise reduction and noise reduction.

As a preferred embodiment of the present application, the air guiding columns 15 in two adjacent noise reduction air channels 14 are arranged in a staggered manner. Therefore, the air guide columns 15 are arranged in the mode, and the total number of the air guide columns 15 can be increased on the premise that the width of the air outlet channel 13 is certain, so that the flow splitting and converging of air flows are increased, the frequency of sound wave offset interference is increased, and the overall air outlet noise reduction effect is improved.

As a preferred embodiment of the present application, the main unit 10 is provided with an air outlet communicating the air outlet channel 13 with the outside, and a buffer chamber 16 is provided between the outlet of the noise reduction air channel 14 and the air outlet.

As shown in fig. 5 and 6, a plurality of upright air baffles 17 are arranged in the air outlet channel 13, a noise reduction air channel 14 is formed between two adjacent air baffles 17, an air outlet of the main machine 10 is arranged on the side surface of the bottom of the main machine 10, one end of the air baffles 17 close to the air outlet is disconnected with the side surface of the bottom of the main machine 10, so that a buffer cavity 16 is formed between the air outlet and the air outlet of the noise reduction air channel 14, when air flow reaches the buffer cavity 16, the air pressure can be reduced, the air speed can be prevented from being excessively high, the air outlet is prevented from being impacted, larger noise is generated, and the air outlet and the air noise are further reduced.

As a preferred embodiment of the present application, the host 10 is provided with an air outlet communicating the air outlet channel 13 with the outside, the air outlet includes a plurality of air outlet holes 18 in a grid shape, and the outlets of the noise reduction air channels 14 are arranged in a staggered manner with the air outlet holes 18.

As shown in fig. 3 or fig. 6, a plurality of air outlet holes 18 are formed on the side surface of the bottom of the host 10, and the outlet of the noise reduction air duct 14 is arranged in a staggered manner with the adjacent air outlet holes 18, for example, the outlet of one noise reduction air duct 14 is arranged between two adjacent air outlet holes 18, so that the arrangement can prevent the air from being directly blown out, prolong the airflow flow path, and facilitate reducing the noise reaching the air outlet holes 18, thereby reducing the noise transmitted to the ears of the user and pleasant the mood of the user.

It will be appreciated that in the above-described version of fig. 6, the air outlet aperture 18 is an elongate rectangular aperture, however, the shape of the air outlet aperture 18 is not limited thereto and may have other shapes, such as a circular aperture.

As a preferred embodiment of the present application, the host 10 includes a casing 101, a motor cover 19 disposed in the casing 101, and an air duct cover 20 disposed at the bottom of the casing 101, where the motor cover 19 surrounds the outside of the motor 12, an air guide channel is formed in the motor cover 19, the air duct cover 20 and the bottom of the casing 101 enclose to form an air outlet channel 13, the air guide channel is connected with the air outlet channel 13 to form a heat dissipation channel of the motor 12, after the air flows from the host 10, the air flows into the air guide channel, after the heat is dissipated from the motor 12, the air flows down along the air guide channel into the air outlet channel 13, and finally flows to an air outlet of the host 10, so that the heat is dissipated into the outside air, and the complete heat dissipation of the motor 12 is realized.

In one embodiment, the bottom of the casing 101 is provided with the base 102, and the plurality of noise reduction air ducts 14 are disposed on the base 102, or may be integrally formed on the base 102 or may be disposed on the base 102 in a fixed manner, so that the plurality of noise reduction air ducts 14 are enclosed into the air outlet channel 13 when the air duct cover 20 is covered on the base 102. In another embodiment, as shown in fig. 5, the air duct cover 20 surrounds and forms an arc-shaped channel 131 and a straight channel 132, and the plurality of noise reduction air ducts 14 may form an integral structure and be disposed in the straight channel 132, so that the air duct cover 20 is covered on the base 102 integrally, thereby facilitating assembly. By flexibly arranging the noise reduction air duct 14, the structure configuration or processing can be more flexible, the improvement on the basis of the existing structure is facilitated, and the adaptability and the universality are improved.

The technical solution protected by the present utility model is not limited to the above embodiments, and it should be noted that, the combination of the technical solution of any one embodiment with the technical solution of the other embodiment or embodiments is within the scope of the present utility model. While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims (10)

1. The noise-reducing food processor comprises a main machine and a cup body assembly arranged on the main machine, wherein a motor for driving a crushing cutter of the cup body assembly to work is arranged in the main machine, the main machine is also provided with an air outlet channel communicated with the outside,

The air conditioner is characterized in that a plurality of noise reduction air channels are arranged in parallel in the air outlet channel, each noise reduction air channel is internally provided with an air guide column, each noise reduction air channel comprises a main air channel, two side air channels and a converging air channel, the two side air channels are respectively arranged on two sides of the air guide column, the main air channel is respectively communicated with one ends of the two side air channels, and the other ends of the two side air channels are respectively communicated with the converging air channels.

2. A noise reducing food processor according to claim 1, wherein,

The two side air channels are symmetrically arranged relative to the central line of the noise reduction air channel.

3. A noise reducing food processor according to claim 2, wherein,

The wind-guiding post orientation the one end of main wind channel is equipped with the tip, the wind-guiding post orientation the other end of converging the wind channel is equipped with circular arc portion, two the side wind channel is in the tip forms first contained angle, two the side wind channel is in circular arc portion forms the second contained angle, first contained angle is less than the second contained angle.

4. A noise reducing food processor according to claim 3, wherein,

The second included angle is an obtuse angle.

5. A noise reducing food processor according to claim 4, wherein,

The second included angle is 135 degrees to 180 degrees.

6. A noise reducing food processor according to claim 1, wherein,

At least two air guide columns are arranged in the noise reduction air duct.

7. A noise reducing food processor according to claim 1, wherein,

The air guide columns in the adjacent two noise reduction air channels are arranged in a staggered mode.

8. A noise reducing food processor according to claim 1, wherein,

The host is provided with an air outlet which is used for communicating the air outlet channel with the outside, and a buffer cavity is arranged between the outlet of the noise reduction air channel and the air outlet.

9. A noise reducing food processor according to claim 1, wherein,

The host is provided with an air outlet which is communicated with the air outlet channel and the outside, the air outlet comprises a plurality of grid-shaped air outlet holes, and the outlets of the noise reduction air channels are arranged in a staggered mode with the air outlet holes.

10. A noise reducing food processor according to any one of the claims 1 to 9, characterized in that,

The host comprises a shell, a motor cover arranged in the shell and an air duct cover arranged at the bottom of the shell, wherein the motor cover surrounds the outer side of the motor, the air duct cover and the bottom of the shell enclose to form an air outlet channel, and a plurality of noise reduction air ducts are arranged at the bottom of the shell or on the air duct cover.