CN217696390U

CN217696390U - Noise elimination air duct device, air duct assembly and cleaning robot

Info

Publication number: CN217696390U
Application number: CN202220576584.7U
Authority: CN
Inventors: 邓美明
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd; Guangzhou Shirui Electronics Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd; Guangzhou Shirui Electronics Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-11-01
Anticipated expiration: 2032-03-15
Also published as: WO2023174338A1

Abstract

The utility model discloses a noise elimination wind channel device, wind channel subassembly and cleaning machines people relates to air purification's technical field, and the air current passageway in the noise elimination wind channel device through setting the air inlet direction and the air-out direction to the setting that staggers each other of at least part, changes the air current flow direction in the air current passageway, reduces the air current velocity of flow. In the airflow channel, set up multistage reposition of redundant personnel subassembly toward the one end that is close to the air outlet by the one end that is close to the air intake, each reposition of redundant personnel in the reposition of redundant personnel subassembly separates two at least reposition of redundant personnel passageways with the airflow channel, the path length in the extension airflow channel, the reposition of redundant personnel subassembly of each grade all can make further reposition of redundant personnel to the air current, the change has increased area of contact and airflow path length between air and each reposition of redundant personnel mutually, let the sound wave can be more fully by the energy-absorbing amortization in the airflow channel, also can avoid the air current to select the condition of shortest path exhaust in the airflow channel, ensure that the interior windage parameter of airflow channel satisfies cleaning device's work demand, improve noise cancelling effect simultaneously.

Description

Noise elimination air duct device, air duct assembly and cleaning robot

Technical Field

The utility model relates to an air purification's technical field especially relates to a noise elimination wind channel device, wind channel subassembly and cleaning machines people.

Background

The existing cleaning equipment, such as a dust collector and an intelligent cleaning robot, has the functions of dust collection, dust removal and the like, and the working principle of the dust collection function is that a motor drives a blade to rotate at a high speed, so that negative air pressure is generated in a sealed shell, and dust on the ground or a position to be cleaned is sucked.

However, because the motor is in a continuous high-speed rotation state in a working state, high-speed airflow generated by the motor can rub against other air and equipment components, so that a duct system of the cleaning equipment can generate large noise in the processes of dust collection and dust removal, the noise not only affects the experience of a user using a corresponding cleaning equipment product, but also affects the stability of the cleaning equipment in the using process due to vibration generated by friction between the air, and the cleaning effect of the equipment is affected to a certain extent.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the utility model provides a noise elimination air duct device, wind channel subassembly and cleaning machines people, under the prerequisite of ensureing cleaning device's work efficiency, solve cleaning device under operating condition too big technical problem of noise.

In order to achieve the purpose, the utility model adopts the following technical proposal:

in a first aspect, there is provided a muffling air duct apparatus comprising:

the air inlet and the air outlet are respectively used for limiting the air inlet direction and the air outlet direction of the air flow channel;

a plurality of stages of flow dividing assemblies are arranged in the airflow channel between the air inlet and the air outlet, each stage of flow dividing assembly divides the airflow channel into a plurality of flow dividing channels, and the flow dividing channels formed by the flow dividing assemblies at each stage are communicated;

the flow dividing assembly comprises at least one flow dividing body, and each flow dividing body divides the airflow channel into at least two flow dividing channels.

As an alternative embodiment, in any two adjacent flow dividing assemblies, the flow dividing body of the flow dividing assembly at the next stage is arranged at one of the flow dividing channels divided by the flow dividing body of the flow dividing assembly at the previous stage.

As an alternative embodiment, the flow splitting fluid comprises:

the windward part is arranged at one end, close to the air inlet, of the flow dividing body and is used for dividing the airflow channel into at least two flow dividing channels which are arranged alternately;

and the at least two air guiding parts are arranged on the side parts of the flow dividing bodies, respectively form the side walls of the flow dividing channels corresponding to the air guiding parts, and are used for guiding the air flow direction in the flow dividing channels corresponding to the air guiding parts.

As an optional implementation manner, the distance between any two adjacent wind guiding portions is greater than or equal to the windward portion.

As an alternative embodiment, the windward portion includes a first diversion surface and a second diversion surface arranged at an included angle, and the first diversion surface and the second diversion surface are used for dividing the airflow channel to form the diversion channel;

the air guide part comprises an air guide surface, one end of the air guide surface is connected with the first shunting surface or the second shunting surface, and the other end of the air guide surface extends along the air flow direction of the corresponding shunting channel.

As an alternative embodiment, on the same flow dividing body, the distance between the wind guide surfaces gradually increases from one end close to the windward portion to one end far away from the windward portion.

As an alternative embodiment, the peripheral shape of the flow distribution body is one or a combination of more of a drop shape, a circle shape, a diamond shape, and a rectangle shape.

As an optional implementation manner, a first channel and a second channel which are connected are formed in the airflow channel, the air inlet is correspondingly communicated with the first channel, and the air outlet is correspondingly communicated with the second channel;

the number of the flow dividing assemblies is more than 2;

the number of the flow dividing bodies of each stage of the flow dividing assembly is gradually increased along the airflow direction of the first channel;

and the number of the flow dividing bodies of the flow dividing assemblies at each stage is gradually reduced along the airflow direction of the second channel.

As an optional embodiment, the muffling air channel device further comprises:

and the air duct shell is hollow inside to form the air flow channel, and the air inlet and the air outlet are both arranged on the air duct shell.

As an alternative embodiment, a sound absorbing material is arranged in the airflow channel.

As an optional implementation manner, the flow dividing body includes a flow dividing body integrally formed on the air duct casing and a sound absorbing material sleeved on a peripheral portion of the flow dividing body.

In an alternative embodiment, the sound absorbing material is disposed around the inner side wall of the air duct housing.

As an optional implementation manner, the sound-absorbing material near the air inlet has a preset energy-absorbing frequency band higher than that of the sound-absorbing material near the air outlet.

As an optional implementation manner, an air inlet channel and an air outlet channel are arranged at two ends of the airflow channel, the air inlet channel is communicated with the air outlet channel through the airflow channel, the air inlet is correspondingly communicated with the air inlet channel, and the air outlet is correspondingly communicated with the air outlet channel;

the air inlet channel and the air outlet channel are at least partially arranged in a staggered mode so as to form at least one windward position in the airflow channel.

As an optional embodiment, the cross-sectional area of the air inlet channel is smaller than that of the air outlet channel.

In an alternative embodiment, the outlet area is larger than the inlet area.

As an optional implementation mode, the air inlet direction and the air outlet direction are at least partially arranged in a staggered mode.

In a second aspect, there is provided a duct assembly comprising:

the silencing air channel device is characterized in that;

and the fan is provided with an exhaust pipe, and the exhaust pipe is communicated with the airflow channel through the air inlet.

As an optional implementation manner, a damping hose is arranged between the exhaust pipe and the muffling air channel device.

In a third aspect, there is provided a cleaning robot comprising:

the air duct assembly as described above;

the cleaning robot comprises a dust collection part, wherein one side of the dust collection part is communicated with the external environment of the cleaning robot, the fan is further provided with an exhaust pipe communicated with the exhaust pipe, and the other side of the dust collection part is connected with the exhaust pipe.

The utility model has the advantages that: in the silencing air channel device, at least part of the air inlet direction and the air outlet direction of the air channel are staggered with each other, so that the length of an air flow path in the air channel is prolonged, the air flow collides in the air channel in the process of flowing to the air outlet, the energy loss of the air flow is reduced, the flow velocity of the air flow is reduced, and the effect of primary noise reduction is achieved;

the multistage shunting assembly is arranged in the airflow channel, each stage of shunting assembly divides the airflow channel into a plurality of shunting channels, the path length in the airflow channel is further prolonged, the shunting bodies can shunt the airflow, a plurality of auxiliary airflows separated by the main airflow enter the shunting channels respectively, furthermore, each stage of shunting assembly can further shunt the airflow, the contact area between the air and each shunting body and the length of the airflow path are increased in a phase-changing manner, the sound waves can be absorbed and silenced more fully in the airflow channel, the condition that the shortest path of the airflow is selected to be discharged in the airflow channel can be avoided, under the condition that the equipment and the size of the airflow channel are not increased, the working requirement of cleaning equipment is met by the wind resistance parameters in the airflow channel, and the noise elimination effect is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is one of schematic structural views of a muffling air duct device according to an embodiment of the present invention;

fig. 2 is a second schematic structural view of the muffling air channel apparatus according to the embodiment of the present invention;

fig. 3 is an exploded view of a muffling air channel device according to an embodiment of the present invention;

fig. 4 is a schematic view of the internal structure of the muffling air channel device according to the embodiment of the present invention (the upper cover and the sound-absorbing material are omitted);

fig. 5 is a schematic structural view of the flow dividing body according to the embodiment of the present invention;

fig. 6 is a schematic diagram illustrating the division of the flow channel splitting area according to the embodiment of the present invention;

fig. 7 is a schematic view illustrating the airflow direction of the airflow channel according to the embodiment of the present invention;

FIG. 8 is one of the assembled views of the air duct assembly according to the embodiment of the present invention;

FIG. 9 is a second view of the assembly of the air duct assembly according to the embodiment of the present invention;

fig. 10 is a simplified schematic structural diagram of a cleaning robot according to an embodiment of the present invention.

In the figure: 10. an air flow channel; 11. an air inlet; 12. an air outlet; 13. a first channel; 14. a second channel; 20. a flow diversion assembly; 21. a flow divider; 211. a windward portion; 2111. a first flow-dividing plane; 2112. a second flow splitting surface; 212. a wind guide part; 2121. an air guide surface; 22. a flow dividing channel; 23. a first-stage flow splitting region; 24. a secondary flow-splitting region; 25. a third stage flow splitting zone; 26. a fourth-stage flow splitting area; 27. a five-stage flow-dividing region; 28. a six-stage flow field; 30. an air duct housing; 31. an air guide pipe; 311. an air outlet flow channel; 32. an air duct connecting pipe; 321. an air inlet channel; 33. an upper cover; 34. a lower cover; 40. a sound absorbing material; 50. a fan; 51. an exhaust pipe; 52. an exhaust duct; 53. a damping hose; 60. a base body; 70. a dust collecting box.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1-2, the present embodiment provides a noise-reduction air duct device, which is mainly applied to a cleaning device, and the noise-reduction air duct device reduces the air outlet noise of the cleaning device, especially a cleaning robot, by additionally providing a multistage flow dividing assembly 20 in an air flow passage 10.

As shown in fig. 10, the present embodiment provides a cleaning robot, which is an intelligent household appliance, also called an automatic cleaning machine, an intelligent dust collection robot, a dust collector, etc., and is one of the intelligent household appliances, and can automatically complete cleaning work in a region by means of certain artificial intelligence. The cleaning robot generally adopts a brushing and vacuum mode to absorb the dust on the ground into the dust collecting box 70 of the cleaning robot, so as to complete the function of cleaning the ground. The cleaning robot is operated remotely by a remote controller or by an operation panel on the body, and the body is mainly of a disk type. The rechargeable battery is used for operation, and generally, the time can be set for cleaning in a reserved mode, and the rechargeable battery can be charged automatically. The sensor is arranged in front of the system, can detect obstacles, can automatically turn when touching a wall or other obstacles, can walk different routes according to the setting of different programs of the system, and can clean the area in a planned place. The cleaning robot can generate noise when the fan runs, so that the use of a user is influenced, and certain influence is also caused on the body health of the user.

Referring to fig. 10, a partial structural diagram of a cleaning robot applied to the muffling air duct apparatus in the present embodiment is shown, the cleaning robot generally includes an outer shell (not shown) and a base assembly disposed in the outer shell, the base assembly includes a base body 60, and the cleaning robot in the present embodiment is formed by disposing driving wheels, batteries, an air duct assembly and other components on the base body 60. The outer shell can play a role in protecting parts in the base assembly of the cleaning robot, a position avoiding space can be correspondingly arranged at the position, corresponding to the air outlet 12 of the silencing air channel device, on the outer shell, and air blown out of the air outlet 12 is discharged out of the outer shell.

The dust collecting box 70 is used for temporarily storing dust and garbage collected by the cleaning robot, the dust collecting box 70 can be detachably mounted on the outer shell of the cleaning robot or is relatively fixed with the outer shell, and a dust discharging port is formed so that a user can clean collected objects in the dust collecting box through automatic dust discharging or manual dust discharging of a workstation. The dust collecting box 70 may be provided with a dust inlet and an air outlet, the dust inlet may be communicated with a dust suction channel (not shown) on the bottom body of the cleaning robot, a dust suction portion communicated with the outside of the cleaning robot is formed on the dust suction channel, when the cleaning robot is in use, the dust suction portion faces the ground to be cleaned by the cleaning robot, and the other side of the dust suction portion is communicated with the air inlet channel 321 of the muffling air channel device through the dust suction channel, the dust collecting box 70 and the air exhaust pipe 52 of the fan 50. The air outlet of the dust box 70 is used for communicating with the exhaust pipe 51 of the blower 50. The fan 50 is a main power output component of the air duct assembly in the cleaning robot, and the fan 50 is used for providing power to form negative pressure in the dust suction channel, so that dust on the ground is sucked into the dust collection box 70.

As shown in fig. 8 to 9, in the air duct assembly applied to the cleaning robot in the present embodiment, the fan 50 is a component that increases the pressure of the air and discharges the air by converting the input electric energy into mechanical energy. The fan 50 of this embodiment has exhaust pipe 51 and exhaust pipe 52, and exhaust pipe 51 can set up at the top or the bottom of fan 50, and exhaust pipe 52 can set up the lateral part at fan 50, so can effectual utilization cleaning machines people's inner space, and fan 50 also can have better wind-force effect.

Be provided with damping hose 53 between exhaust pipe 52 and the noise elimination air duct device, damping hose 53 is for having shock-absorbing function's material, specifically can adopt soft materials such as flexible glue, and damping hose 53 can reduce the noise of fan 50 exhaust pipe 52 department through the shock attenuation, also can improve the gas tightness between fan 50 and the noise elimination air duct device, has ensured the stability of air current circulation, and then has improved the reliability of wind channel subassembly.

The blower 50 includes a housing and an air supply member disposed in the housing, and a space for providing air flow is formed between the housing and the air supply member, and the space is communicated with the external environment of the housing through an exhaust duct 51 and an exhaust duct 52, respectively. The casing can play the effect of protection air supply spare and preventing that the air current from leaking, and exhaust pipe 52 is tangent with the rotation direction of air supply spare for the air current circulation in fan 50 is more smooth and easy, increases fan 50's air supply efficiency.

As shown in fig. 3 to 5, the muffling air channel device of the present embodiment includes an air flow channel 10, where the air flow channel 10 provides a space of an air exhaust flow channel of a cleaning device during a dust suction process, so as to limit an air flow direction of air exhausted by a fan 50, and two ends of the air flow channel 10 are respectively provided with an air inlet 11 and an air outlet 12 communicated with an external environment, and in an application of the cleaning robot, according to the above-mentioned scheme, the air inlet 11 is used for communicating with an exhaust duct 52 of the fan 50, and air exhausted by the exhaust duct 52 can be exhausted from the air outlet 12 through the air flow channel 10 to the outside of the cleaning robot. The air inlet 11 and the air outlet 12 are respectively used for limiting an air inlet direction and an air outlet direction of the airflow channel 10, at least a part of the air inlet direction and the air outlet direction are staggered with each other, the staggered arrangement of the air inlet direction and the air outlet direction can be understood that at least a part of the air inlet direction and the air outlet direction are not in the same direction, and can also be understood that even if the air inlet direction and the air outlet direction are in the same direction, the staggered directions can be staggered on the same horizontal plane or different horizontal planes, and at least a part of the air inlet direction and the air outlet direction are also in two staggered positions, so that at least a part of an airflow path in the airflow channel 10 is of a turbulent flow structure which is bent, bent and the like and can disturb the airflow flowing direction. When the air current is through airflow channel 10, can collide with airflow channel 10 lateral wall, when changing the flow direction, inevitably take place energy loss, form the labyrinth wind channel structure of simple and easy type, thereby let airflow energy loss reduce the air current velocity of flow, reach the effect of making an uproar of tentatively falling.

In the airflow channel 10, from one end near the air inlet 11 to one end near the air outlet 12, that is, in the airflow direction from the air inlet 11 to the air outlet 12 of the airflow channel 10, multiple stages of flow dividing assemblies 20 are sequentially arranged, each stage of flow dividing assembly 20 divides the airflow channel 10 into multiple flow dividing channels 22, the main airflow entering the airflow channel 10 from the air inlet 11 can be divided by the flow dividing channels 22, so as to form a plurality of sub-airflows, after the sub-airflows enter the corresponding flow dividing channels 22 respectively, the sub-airflows are guided by the flow dividing channels 22, the flow direction is changed, thereby the airflow path of the sub-airflows is extended, energy loss can occur during the process of changing the flow direction of each sub-airflow, the flow rate of each sub-airflow is reduced, corresponding noise elimination structures can be arranged in the flow dividing channels 22, so that the sound waves of the sub-airflows are buffered and absorbed in the flow dividing channels 22 formed by each stage, so that the sub-airflows can be reunited when approaching the air outlet 12, and the noise elimination device is discharged.

In this embodiment, the structure and the noise elimination structure of the diversion channel 22 are designed to ensure that the wind resistance parameter meets the requirements of the cleaning robot in the working process, and ensure that the flow of each secondary airflow in the diversion channel 22 is smooth, so that the negative pressure formed at the exhaust pipe 51 of the blower 50 is enough to suck the dust at the dust suction part in the application of the cleaning device.

Specifically, the flow dividing assembly 20 includes at least one flow dividing body 21, each flow dividing body 21 divides the airflow channel 10 into at least two flow dividing channels 22, so as to perform the above-mentioned functions of diffusing, disturbing, guiding sound waves, and the like on the airflow, and when the secondary airflow travels into the corresponding flow dividing channel 22, the sound waves of the secondary airflow undergo multiple and repeated contact friction with a sound attenuation structure arranged in the flow dividing channel 22, so that the sound waves are absorbed in the flow dividing channel 22, or when the secondary airflow undergoes contact friction with the flow dividing body 21, resonance is generated between the secondary airflow and the flow dividing bodies 21, so that the sound waves of the secondary airflow are consumed and absorbed.

Further, in any two adjacent flow splitting assemblies 20, the flow splitting body 21 at the next stage is disposed at one of the flow splitting channels 22 separated by the flow splitting body 21 at the previous stage, it can be understood that after the main air flow entering the air flow channel 10 from the air inlet 11 is split by the flow splitting body 21 in the first stage flow splitting assembly 20 disposed closest to the air inlet 11 to form at least two secondary air flows, the secondary air flows flow in the flow splitting channel 22 separated by the first stage flow splitting assembly 20 and are subjected to noise elimination treatment, each secondary air flow is guided to the flow splitting assembly 20 at the next stage by the corresponding flow splitting channel 22, then at least one secondary air flow is further split and disturbed by the flow splitting body 21 at the next stage, the further diverted secondary air flow flows into the subsequent flow splitting channel 22 and is subjected to further noise elimination treatment, so that the multiple levels of flow splitting channels 22 are formed in the air flow channel 10, sound waves in the air flows are subjected to noise elimination treatment after being continuously split and disturbed, and are then further diverted and disturbed, contact areas between each air flow and the flow splitting body 21 and the noise elimination structure are fully increased, and the sound wave energy is buffered by each flow splitting channel 22, so that most of the sound wave is effectively consumed in the sound wave damping device.

In the present embodiment, at least one side wall of the diversion channel 22 is formed by the side portion of the diversion body 21, and the other side wall of the diversion channel 22 may be determined according to the structure located at the side portion of the diversion body 21.

In one case, the number of the divided flow bodies 21 in the same stage of the flow splitting assembly 20 is greater than or equal to two, any two adjacent divided flow bodies 21 in the same stage of the flow splitting assembly 20 are oppositely arranged, two divided flow channels 22 are formed on the opposite sides of the two divided flow bodies 21 from the view point of the gas flow, and the two divided flow channels 22 finally form a confluence, and the side walls of the two divided flow channels 22 are respectively formed by two adjacent divided flow bodies 21.

In another case, the number of the flow dividing bodies 21 in the same stage of flow dividing assembly 20 is one, and a flow dividing channel 22 is formed between the side of the flow dividing body 21 and the inner wall of the muffling air channel device; or when the number of the flow dividing bodies 21 in the same stage of flow dividing assembly 20 is more than or equal to two, the flow dividing body is arranged at the side part of the flow dividing body 21 closest to the inner wall of the silencing air channel device, and a flow dividing channel 22 is formed between the flow dividing body and the inner wall of the silencing air channel device.

According to the above, each secondary air flow can be guided to flow between the inner wall of the muffling air channel device and the flow dividing body 21 and in the flow dividing channel 22 formed between the flow dividing bodies 21.

Of course, in another embodiment, a partition plate may be disposed between any two adjacently disposed flow dividing bodies 21 of the same stage of flow dividing assembly 20, and a partition plate may be disposed between the flow dividing body 21 and the inner wall of the muffling air channel apparatus, so that the flow dividing channel 22 is formed by the partition plate and the side portion of the flow dividing body 21.

As shown in fig. 6, taking a schematic partial structure diagram of the inside of the airflow channel 10 as an example, in this embodiment, the primary flow dividing assembly 20 disposed closest to the air inlet 11 includes one flow dividing body 21, the secondary flow dividing assembly 20 behind the primary flow dividing assembly 20 includes two flow dividing bodies 21, and the flow dividing bodies 21 in the secondary flow dividing assembly 20 are respectively disposed on the paths of two flow dividing channels 22 formed by the flow dividing bodies 21 of the primary flow dividing assembly 20. Like this, the main air current that gets into from air intake 11 can be separated by the reposition of redundant personnel 21 that is located first level reposition of redundant personnel subassembly 20 and forms twice secondary air current, twice secondary air current flows along the reposition of redundant personnel 22 that is located first level reposition of redundant personnel 21 both sides formation respectively, flow direction is located two reposition of redundant personnel 21 departments of second level reposition of redundant personnel subassembly 20 respectively, subsequently, when secondary air current contacts respectively to the reposition of redundant personnel 21 that is located the second level, divide into twice secondary air current respectively again, finally form four at least secondary air currents, the air current is when not separating once, its flow direction, the velocity of flow, the flow all can change, thereby can improve each reposition of redundant personnel passageway 22 and the area of contact of its inside gas, effectively improve sound wave noise elimination effect.

It should be noted that the first-stage flow splitting assembly 20, i.e., the flow splitting assembly 20 in the first-stage partition in this embodiment, is the flow splitting assembly 20 disposed closest to the air inlet 11, the last-stage flow splitting assembly 20, i.e., the flow splitting assembly 20 in the sixth-stage partition in this embodiment, is the flow splitting assembly 20 disposed closest to the air outlet 12, and the second-stage flow splitting assembly 20, the third-stage flow splitting assembly 20, and the flow splitting assemblies 20 in the subsequent stages are the flow splitting assemblies 20 in the flow splitting areas of each stage sequentially arranged along the airflow direction of the airflow channel 10. The former stage of the flow dividing assembly 20 refers to the flow dividing assembly 20 described relatively located in the flow dividing region in the direction close to the side of the air inlet 11, and the latter stage of the flow dividing assembly 20 refers to the flow dividing assembly 20 described relatively located in the flow dividing region in the direction close to the side of the air outlet 12.

The noise principle formed by the exhaust duct 52 of the fan 50 is explained here, because the pipe diameter of the exhaust duct 52 is small, the blowing member forms a large air pressure in the casing of the fan 50 during the rotation process, therefore, when the air with a large pressure is discharged out of the exhaust duct 52, the air with a large pressure can cause impact vibration to the outside air, thereby generating noise, therefore, when the rotating speed of the blowing member is faster and the air pressure in the exhaust duct 52 is larger, the noise formed by the fan 50 during the exhaust process is larger. In order to sufficiently reduce the noise of the air flow discharged from the exhaust duct 52 and improve the noise reduction effect of the noise sound wave, the size of the air flow passage 10 needs to be larger than that of the exhaust duct 52, so as to provide sufficient buffer space for the discharged air flow, thereby allowing the noise to be buffered and absorbed in the noise reduction air duct device.

In order to further improve the noise reduction effect on the noise sound wave in the limited installation space of the noise reduction duct device adapted to the cleaning robot, the flow dividing body 21 includes a windward portion 211 and a wind guide portion 212. It should be noted that the windward portion 211 and the air guiding portion 212 may be integrally formed, so as to reduce the difficulty in the processes of processing and mounting the flow dividing body 21. The windward portion 211 and the air guide portion 212 may be two independent members, and two members coupled to each other in the air passage structure formed by the two members are provided in the airflow passage 10 by independent processing, mounting, or the like.

In the same flow dividing body 21, the windward portion 211 is disposed at one end of the flow dividing body 21 close to the air inlet 11, and is configured to divide the air flow channel 10 into at least two flow dividing channels 22 spaced at intervals, when the air flow flows to the flow dividing body 21, the windward portion 211 is a portion of the flow dividing body 21 which is firstly contacted with the air flow, the windward portion 211 blocks the air flow, the direction of the air flow is changed, the air flow is divided into at least two flows, and each divided air flow flows to the corresponding flow dividing channel 22. The number of the air guiding parts 212 is at least two, each air guiding part 212 is respectively arranged at two opposite side parts of the flow dividing body 21, each air guiding part 212 respectively forms one side wall of each corresponding flow dividing channel 22, the air guiding parts 212 are used for guiding the direction of the air flow in the flow dividing channels 22 corresponding to the air guiding parts, wherein each air guiding part 212 is matched with the air flow path formed by the separation of the windward part 211, so that each air flow divided and flowed out from the windward part 211 can be guided by the air guiding parts 212, and the buffering and absorbing effects of noise sound waves in the air flow can also be improved.

Specifically, in the same flow dividing body 21, the distance between any two adjacent air guiding portions 212 is greater than or equal to the distance between the windward portions 211, so as to form a diffusion-shaped flow dividing channel 22 structure, so as to provide a sufficient installation space for the next-stage flow dividing body 21 and a sufficient flow space for air.

In the present embodiment, taking as an example that no flow splitting body 21 can separate two air flows, the windward portion 211 includes a first flow splitting surface 2111 and a second flow splitting surface 2112 which are arranged at an included angle, the first flow splitting surface 2111 and the second flow splitting surface 2112 are used for separating the air flow channel 10 to form a flow splitting channel 22, the first flow splitting surface 2111 is connected to one end of the second flow splitting surface 2112, and the first flow splitting surface 2111 and the second flow splitting surface 2112 can gradually extend in a direction away from each other and toward the air outlet 12, it can be understood that, as shown in fig. 7, when the main air flow L1 contacts the windward portion 211, the air flow is separated into two sub air flows L2 by one end of the first windward surface contacting the second windward surface, and the two separated sub air flows L2 respectively in a direction guided by the first flow splitting surface 2111 and the second flow splitting surface 2112 and flow to the corresponding air guiding portion 212.

As described above, when the windward portion 211 can separate two secondary airflows L2, two air guiding portions 212 are provided, each air guiding portion 212 includes the air guiding surface 2121, one end of the air guiding surface 2121 is connected to the first diverging surface 2111 or the second diverging surface 2112, and the other end of the air guiding surface 2121 extends in the airflow direction of the diverging passage 22 corresponding thereto, and it can be understood that, in the same diverging body 21, taking the air guiding portion 212 as two examples, the air guiding surface 2121 includes the first guiding surface and the second guiding surface, one end of the first guiding surface is connected to the first diverging surface 2111, one end of the second guiding surface is connected to the second diverging surface 2112, and the other ends of the first guiding surface and the second guiding surface are away from each other and extend in the direction of the air outlet 12. The airflow path formed by the first diverging surface 2111 is coupled to the airflow path of the first guide surface, and the airflow path formed by the second diverging surface 2112 is coupled to the airflow path of the second guide surface.

The distance between the air guiding surfaces 2121 gradually increases from the end close to the windward portion 211 to the end away from the windward portion 211, and when there are two air guiding portions 212, the distance between the two air guiding surfaces 2121 gradually increases in the process of extending in the direction away from each other, so as to form a diffusion-like structure, so as to provide a sufficient installation space for the subsequent splitter 21 and a sufficient airflow flowing space for the subsequent splitter passage 22.

It will be appreciated that the perimeter shape of the flow distribution body 21 includes, but is not limited to, a combination of one or more of a drop shape, a circle, a diamond shape, and a rectangle.

The above description of the structure of the flow distribution body 21 is applied to the case where the peripheral portion of the flow distribution body 21 has an irregular shape such as a droplet shape, a rhombus shape, a rectangle shape, or the like, and the peripheral portion of the flow distribution body 21 in the present embodiment has a droplet-shaped structure.

Of course, the windward portion 211 may be a single plane as long as the effect of dividing the airflow is satisfied.

A first channel 13 and a second channel 14 which are connected are formed in the airflow channel 10, the air inlet 11 is correspondingly communicated with the first channel 13, the air outlet 12 is correspondingly communicated with the second channel 14, the number of the flow dividing assemblies 20 is more than 2, the number of the flow dividing bodies 21 of each level of the flow dividing assemblies 20 increases gradually along the airflow direction of the first channel 13, and the number of the flow dividing bodies 21 of each level of the flow dividing assemblies 20 decreases gradually along the airflow direction of the second channel 14. Thereby satisfy the main air current and separated the effect of multichannel secondary air current after getting into airflow channel 10, also satisfied multichannel secondary air current and can confluent into the effect that an air current discharged from air outlet 12 when being close to air outlet 12, thereby when satisfying air duct device noise elimination requirement through wind channel inner structure, let air duct device reduce gradually again after the volume increases gradually from air intake 11 to the direction of air outlet 12, reduce air duct device whole volume as far as possible, satisfy cleaning machines people's installation demand.

As shown in fig. 6-7, the airflow channel 10 is sequentially provided with multiple diversion areas along the airflow direction, and each diversion area is provided with the diversion assembly 20; in the airflow direction, the number of the diversion channels 22 divided by any two adjacent diversion regions increases or decreases step by step. Illustratively, the airflow channel 10 is sequentially provided with six diverging areas in the airflow direction, a first-stage diverging area closest to the air inlet 11, that is, the first-stage diverging area 23 includes one diverging body 21, a windward portion 211 of the diverging body 21 located in the first-stage diverging area 23 is disposed toward the air inlet 11, a main airflow L1 entering from the air inlet 11 is divided into two secondary airflows L2 by the diverging portion of the first-stage diverging area 23, and the two secondary airflows respectively flow along the diverging channels 22 disposed at intervals. The flow dividing assembly 20 in the subsequent secondary flow dividing region 24 includes two flow dividing bodies 21, the two flow dividing bodies 21 located in the secondary flow dividing region 24 are respectively disposed on the paths of the two flow dividing channels 22 separated by the primary flow dividing region 23, the windward portions 211 of the flow dividing bodies 21 in the secondary flow dividing region 24 face the windward directions of the flow dividing channels 22 where the flow dividing bodies are respectively located, and respectively divide two secondary airflows L2, so as to separate four secondary airflows L3-1, and the secondary airflows L3-1 between two adjacent flow dividing bodies 21 are merged after flowing for a certain distance along the flow dividing channels 22 to form a merged flow L3-2. The flow dividing assembly 20 of the third-stage flow dividing region 25 comprises three flow dividing bodies 21, the three flow dividing bodies 21 are respectively arranged on flow dividing channels 22 formed by the second-stage partition separation, one flow dividing body 21 positioned on the third-stage flow dividing region 25 is arranged on a confluence channel to divide the combined flow L3-2, the flow dividing bodies 21 positioned on the two sides divide the auxiliary air flow L3-1 on the two sides of the second-stage flow dividing region 24 to form six auxiliary air flows L4-1, and the auxiliary air flows L4-1 between two adjacent flow dividing bodies 21 are converged after flowing for a certain distance to form confluence L4-2. The flow dividing section of the fourth-stage flow dividing region 26 includes four flow dividing bodies 21, and the flow dividing principle is the same as that of the third-stage flow dividing region 25, and the four flow dividing bodies 21 divide the flow corresponding to the secondary air flow L4-1 and the two merged flows L4-2 on both sides of the third-stage flow dividing body 21. And the flow dividing bodies 21 in the five-stage flow dividing region 27 and the six-stage flow dividing region 28 gradually decrease, so that the auxiliary air flows and the confluence are finally converged and discharged out of the air outlet 12. In the process, the main air flow can be separated into a plurality of auxiliary air flows with flow rates relatively smaller than that of the main air flow, so that the auxiliary air flows are disturbed, buffered and absorbed step by step, and finally, the air flows with the noise sound waves absorbed can be converged again and discharged out of the air outlet 12.

As shown in fig. 4, the muffling air duct device further includes an air duct housing 30, an air flow channel 10 is formed in the air duct housing, and the air inlet 11 and the air outlet 12 are both opened in the air duct housing 30. Each shunt body 21 is arranged in the air duct shell 30, so that each shunt channel 22 is formed in the air duct shell 30, a space opposite to the air inlet 11 and the air outlet 12 is arranged on the surface of the air duct shell 30, the air duct shell 30 can be provided with an air guide pipe 31 extending out of the air duct shell 30 at the air outlet position, an air outlet flow passage 311 is formed in the air guide pipe 31, so that the flow direction of gas exhausted from the noise elimination air duct device is limited, an air duct connecting pipe 32 extending out of the air duct shell 30 can be arranged at the air inlet 11 of the air duct shell 30, an air inlet flow passage 321 is formed in the air duct connecting pipe 32, the flow direction of gas entering the noise elimination air duct device is limited, and the noise elimination air duct device is conveniently connected with the fan 50.

Specifically, the cross-sectional shapes of the inlet channel 321 and the outlet channel 311 may be various, such as but not limited to: round, square, horn, and other irregular shapes.

In the case where the number of the flow dividing bodies 21 in the same flow dividing assembly 20 is equal to or greater than two due to the formation of the flow dividing passages 22, the flow dividing bodies 21 are disposed on opposite sides of the flow dividing assembly 20, and the flow dividing passages 22 are formed between the side walls of the flow dividing bodies 21, that is, the flow guide portion and the inner side wall of the air duct housing 30.

In another case, in the case that the number of the flow dividing bodies 21 in the same stage of the flow dividing assembly 20 is one, the flow dividing channel 22 is formed between the side portion of the flow dividing body 21, i.e., the flow guiding portion, and the inner side wall of the air duct housing 30.

As shown in fig. 3, in order to facilitate the production, assembly and subsequent replacement and maintenance of the components, the air duct housing 30 includes an upper cover 33 and a lower cover 34 that are covered with each other, the air flow channel 10 can be formed by the assembly of the upper shell and the lower shell, and the flow dividing body 21 can be disposed on the upper shell or the lower shell, which can improve the processing efficiency by integral molding during the processing. The upper casing and the lower casing, specifically, the two casings of the noise elimination air duct device, which are relatively close to the cleaning robot and relatively far away from the cleaning robot in the state of being installed on the cleaning robot, are defined as the lower casing, the casing relatively close to one side of the cleaning robot is defined as the upper casing, the casing relatively far away from one side of the cleaning robot is defined as the upper casing, the upper cover 33 and the lower cover 34 can be detachably connected through a buckle, and the fixed connection can also be realized through a threaded connection and other modes.

Optionally, the material of the air guiding portion 212, the upper cover 33 and the lower cover 34 includes, but is not limited to, one or more of a resin material, a plastic material and a metal material.

It can be understood that, in order to make the flow dividing body 21 fully contact with the air in the airflow channel 10, the airflow flowing through the flow dividing body 21 in the airflow channel 10 can be divided and diffused, one end of the flow dividing body 21 is disposed on the lower cover 34, and after the upper cover 33 and the lower cover 34 are closed, the other end of the flow dividing body 21 can be abutted against the upper cover 33, so that the flow dividing body 21 is horizontally disposed between the upper cover 33 and the lower cover 34.

In order to further improve the sound-deadening effect, a sound-absorbing material 40 is provided in the airflow passage 10.

As one of the embodiments, the shunting body 21 includes a shunting body integrally formed on the air duct casing 30 and the sound-absorbing material 40 sleeved on the circumference of the shunting body, and compared with the scheme that the shunting body and the air duct casing 30 are separately processed and then are subsequently assembled and connected, the shunting body integrally formed on the air duct casing 30 does not need to be provided with an assembly structure or reserve an installation position between the air duct casing 30 and the shunting body, which is more beneficial to the production and processing of the device.

In another embodiment, the sound absorbing material 40 is disposed around the inner side wall of the duct housing 30.

It can be understood that sound absorbing material 40 is different with the material of reposition of redundant personnel body, through the aforesaid setting, can let shunt body 21 when shunting the air current, let the air contact with sound absorbing material 40 as far as possible, the air current is divided into at least twice back by shunt body 21, each way air current homoenergetic contact sound absorbing material 40, compare and adopt sound absorbing material 40 and air current to contact simply, when handling through the reposition of redundant personnel can reduce the air current speed, improve the area of contact of air and sound absorbing material 40, the noise elimination effect of noise elimination air duct device is further improved.

Of course, sound-absorbing material 40 may be disposed on both upper and lower sides of the upper and lower shells for enclosing the airflow channel 10, but there should be a certain gap between the sound-absorbing material 40 on the upper and lower shells to ensure that the air can smoothly pass through the diversion channel 22.

Specifically, the sound absorbing material 40 may be a sheet or block structure, and when the sound absorbing material 40 is a sheet structure, the sound absorbing material 40 may be attached to the inner wall of the air duct housing 30 or the periphery of each flow dividing body 21 by means of sticking, clamping, or the like. When the sound-absorbing material 40 has a block structure, the sound-absorbing material 40 may be provided so as to fill the ventilation space.

The sound absorbing material 40 provided in the present embodiment has a sheet-like structure, and is attached to the outer peripheral wall of each flow dividing member 21 and the inner side wall of the duct case 30.

It should be noted that the sound-absorbing material 40 may be selected to reduce the noise generated by the air discharged from the fan 50 when the cleaning robot is in operation, and the sound-absorbing material 40 should be selected to meet some requirements. For example, the sound-absorbing material 40 needs to be a permeable member, or the wind resistance of the sound-absorbing material 40 should not be too large, so that the sound-absorbing material 40 can reduce the noise of the air flow passing through without affecting the normal operation of the fan 50. The sound-absorbing material 40 needs to be a good noise reduction component, so that the sound-absorbing material 40 can reduce noise to the maximum extent, and enhance the user experience.

In the present embodiment, the sound absorbing material 40 is sound absorbing cotton, and the material of the sound absorbing cotton is not limited to cellucotton, polyurethane sound absorbing cotton, sponge, pearl cotton, and the like, and the thickness thereof is not limited. It can be understood that inhale the cotton inner structure of sound for the mesh form, when the noise spreads into and inhales the cotton surface of sound, a part of noise can be inhaled the cotton reflection of sound by inhaling, the noise of bounce-back can offset with the follow-up noise that reaches the cotton direction of inhaling the sound, reach the effect of once eliminating the sound, a part of noise can be seen through inhales the sound cotton, it absorbs to be inhaled the cotton by inhaling the sound, partly noise in addition can be propagated by the vibrations of itself when producing the friction with surrounding medium by the loss, finally reach the effect of eliminating the sound.

Furthermore, the silencing cotton is a material which is processed by a plurality of processes from single or a plurality of different fibers, wherein the silencing cotton with better silencing and noise reducing effects can be polyester silencing cotton. The polyester silencing cotton is formed by 100% polyester fiber through high-technology hot pressing and in a cocoon cotton shape, has good air permeability, has a sound absorption coefficient of 0.94 within a noise range of 125-4000HZ, and can absorb noise generated by air exhaust of the fan 50 to the maximum extent.

Because the ventilation space has a certain length, when the noise flows through each shunting channel 22 along with the airflow, the noise frequency band can not be attenuated continuously along with the distance and time, therefore, in the process that the noise flows through each shunting channel 22 along with the airflow direction, the frequency band can be lower and lower, in view of this, in order to improve the noise elimination effect of the noise in different frequency bands, the sound-absorbing material 40 close to one side of the air inlet 11 is higher than the preset energy-absorbing frequency band of the sound-absorbing material 40 close to one side of the air outlet 12 in the preset energy-absorbing frequency band, the range of the frequency band covered by the noise elimination frequency band of the noise elimination air channel device is wider, and the applicability of the noise elimination air channel device is improved.

Finally, it should be noted that the muffling air channel device in the present embodiment does not have a completely muffling effect on the fan 50 and the air flow discharged by the fan 50, but only reduces the noise, so that the user can approximately ignore the reduced noise when applying the muffling air channel device to the corresponding cleaning apparatus.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used merely for convenience in description and simplicity of operation, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. A muffling air duct apparatus, comprising:

the air conditioner comprises an air flow channel (10), wherein an air inlet (11) and an air outlet (12) communicated with the external environment are respectively arranged at two ends of the air flow channel (10), and the air inlet (11) and the air outlet (12) are respectively used for limiting the air inlet direction and the air outlet direction of the air flow channel (10);

in the airflow channel (10), a multi-stage flow dividing assembly (20) is arranged between the air inlet (11) and the air outlet (12), each stage of flow dividing assembly (20) divides the airflow channel (10) into a plurality of flow dividing channels (22), and the flow dividing channels (22) formed by each stage of flow dividing assembly (20) in a separating way are communicated;

the flow dividing assembly (20) comprises at least one flow dividing body (21), and each flow dividing body (21) divides the airflow channel (10) into at least two flow dividing channels (22).

2. A muffling air channel device according to claim 1, wherein in any two adjacent flow splitting assemblies (20), the flow splitting body (21) of the flow splitting assembly (20) of the subsequent stage is disposed at one of the flow splitting passages (22) divided by the flow splitting body (21) of the flow splitting assembly (20) of the previous stage.

3. A muffling air channel device according to claim 2, characterized in that said flow-dividing body (21) comprises:

the windward part (211) is arranged at one end, close to the air inlet (11), of the flow dividing body (21), and the windward part (211) is used for dividing the airflow channel (10) into at least two flow dividing channels (22) which are arranged alternately;

the air guide parts (212) are arranged on the side parts of the flow dividing bodies (21) and respectively form the side walls of the flow dividing channels (22) corresponding to the flow dividing bodies, and the air guide parts (212) are used for guiding the airflow direction in the flow dividing channels (22) corresponding to the air guide parts.

4. The muffling air channel device according to claim 3, wherein the distance between any two adjacent air guiding portions (212) is greater than or equal to the windward portion (211).

5. A muffling air channel arrangement according to claim 3, wherein the windward portion (211) comprises a first diverging surface (2111) and a second diverging surface (2112) arranged at an angle, the first diverging surface (2111) and the second diverging surface (2112) separating the air flow channel (10) to form the diverging channel (22);

the air guide part (212) comprises an air guide surface (2121), one end of the air guide surface (2121) is connected with the first shunting surface (2111) or the second shunting surface (2112), and the other end of the air guide surface (2121) extends along the airflow direction of the corresponding shunting channel (22).

6. The muffling air channel device according to claim 5, wherein the distance between the air guide surfaces (2121) is gradually increased from the end close to the windward portion (211) to the end away from the windward portion (211) on the same flow dividing body (21).

7. A muffling air channel device according to claim 1, wherein the peripheral shape of the flow dividing body (21) is one or a combination of more of a drop shape, a circle shape, a diamond shape, and a rectangle shape.

8. A muffling air channel device according to any one of claims 1 to 7, wherein the air flow channel (10) is sequentially provided with a plurality of splitting areas along the air flow direction, and each splitting area is internally provided with the splitting assembly (20);

along the airflow direction, the number of the diversion channels (22) separated by any two adjacent diversion areas is gradually increased or decreased.

9. A silencing air channel device according to any one of claims 1-7, wherein a first channel (13) and a second channel (14) are formed in the air flow channel (10) and connected, the air inlet (11) is correspondingly communicated with the first channel (13), and the air outlet (12) is correspondingly communicated with the second channel (14);

the number of the flow dividing assemblies (20) is more than 2;

the number of the flow dividing bodies (21) of each stage of the flow dividing assembly (20) is gradually increased along the airflow direction of the first channel (13);

the number of the flow dividing bodies (21) of each stage of the flow dividing assembly (20) is gradually reduced along the airflow direction of the second channel (14).

10. The muffling air duct apparatus of any one of claims 1-7, further comprising:

the air duct shell (30) is hollow to form the air flow channel (10), and the air inlet (11) and the air outlet (12) are both arranged on the air duct shell (30).

11. A muffling air channel device according to claim 10, wherein a sound-absorbing material (40) is arranged inside the air flow channel (10).

12. A muffling air channel device according to claim 11, wherein the flow dividing body (21) comprises a flow dividing body integrally formed with the air channel housing (30) and a sound absorbing material (40) fitted around the flow dividing body.

13. A muffling air channel device according to claim 11, wherein the sound-absorbing material (40) is disposed around the inner side wall of the air channel housing (30).

14. A muffling air channel device according to claim 11, wherein the sound-absorbing material (40) near the air inlet (11) has a higher predetermined energy-absorbing frequency band than the sound-absorbing material (40) near the air outlet (12).

15. The muffling air channel device according to claim 1, wherein an air inlet channel (321) and an air outlet channel (311) are disposed at two ends of the air flow channel (10), the air inlet channel (321) is communicated with the air outlet channel (311) through the air flow channel (10), the air inlet (11) is correspondingly communicated with the air inlet channel (321), and the air outlet (12) is correspondingly communicated with the air outlet channel (311);

the air inlet channel (321) and the air outlet channel (311) are at least partially arranged in a staggered mode, so that at least one windward position is formed in the airflow channel (10).

16. A muffling air channel device according to claim 15, wherein the cross-sectional area of the inlet air channel (321) is smaller than the cross-sectional area of the outlet air channel (311).

17. A muffling air channel device according to any of claims 1, 15 and 16, wherein the area of the air outlet (12) is larger than the area of the air inlet (11).

18. The muffling air channel device according to claim 1, wherein the air inlet direction and the air outlet direction are at least partially staggered from each other.

19. An air duct assembly, comprising:

the muffling air ducting arrangement of any one of claims 1-18;

the fan (50) is provided with an exhaust pipe (52), and the exhaust pipe (52) is communicated with the airflow channel (10) through the air inlet (11).

20. The air duct assembly according to claim 19, characterized in that a damping hose (53) is provided between the exhaust duct (52) and the muffling air duct apparatus.

21. A cleaning robot, characterized by comprising:

the air duct assembly of claim 19 or 20;

the cleaning robot comprises a dust suction part, wherein one side of the dust suction part is communicated with the external environment of the cleaning robot, the fan (50) is further provided with an exhaust pipe (51) communicated with the exhaust pipe (52), and the other side of the dust suction part is connected with the exhaust pipe (51).