Noise-reducing air duct device, air duct assembly and cleaning robot

Abstract

This application provides a sound-absorbing air duct device, an air duct assembly, and a cleaning robot related to the technical field of air purification. The airflow passage of the sound-absorbing air duct device has an air supply direction and an air exhaust direction at least partially offset from each other, thereby changing the flow direction of the airflow therein and reducing the flow speed of the airflow. The airflow passage is provided with a multi-stage branching assembly from an end close to the air supply port to an end close to the air exhaust port, and the dividers of each stage in the branching assembly divide the airflow passage into at least two branching passages, extending the path length in the airflow passage, and the branching assemblies of each stage can further branch the airflow, so that the contact area between the air and each divider and the length of the airflow path are unnoticeably increased, so that the sound waves can be fully absorbed and silenced in the airflow passage, and the airflow can be prevented from selecting the shortest path in the airflow passage to be discharged, ensuring that the wind resistance parameters in the airflow passage meet the working needs of the cleaning device, and at the same time improving the noise removal effect.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on March 15, 2022, bearing application number 202220576584.7 and titled "Sound-reducing air duct device, air duct assembly and cleaning robot," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of air purification, and in particular to a sound-reducing air duct device, an air duct assembly and a cleaning robot. [Background technology]

[0003] Existing cleaning devices such as dust vacuums and intelligent cleaning robots are all equipped with functions such as dust collection and dust removal. The working principle of the dust collection function is that a motor rotates the blades at high speed, generating negative air pressure inside a sealed housing, which then sucks up dust on the ground or the area that needs to be cleaned.

[0004] However, because the motor continues to rotate at high speed when in operation, the high-speed airflow generated by the motor will cause friction with other air and equipment components. As a result, the vacuum cleaner will generate loud noise from the air duct system during the dust collection and removal process. Not only does the noise affect the user experience of the corresponding vacuum cleaner product, but the vibration caused by the friction between the air also affects the stability of the vacuum cleaner during the use process, and the cleaning effect of the appliance will be affected to a certain extent. Summary of the Invention

[0005] The objective of the present application is to provide a noise-reducing air duct device, an air duct assembly and a cleaning robot that solve the technical problem that the noise of a cleaning appliance is too loud in the working state, on the premise of ensuring the working efficiency of the cleaning appliance.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0007] The noise absorbing air duct device according to the first aspect is an airflow passage, the airflow passage having an air intake port and an air exhaust port at both ends thereof, the air intake port and the air exhaust port being used to restrict an air intake direction and an air exhaust direction of the airflow passage, respectively; In the airflow passage, a multi-stage branching assembly is provided between the air intake port and the air exhaust port, and the branching assembly of each stage divides the airflow passage into several branching passages, and the branching passages divided by the branching assemblies of each stage are connected to each other, The branching assembly includes at least one divider, each of which divides the airflow passage into at least two branching passages.

[0008] The air duct assembly according to the second aspect includes: The sound absorbing air duct arrangement according to the first aspect, a blower having an exhaust duct communicating with the airflow passage through the air intake port.

[0009] The cleaning robot according to the third aspect is An air duct assembly according to the second aspect; The blower further has an intake duct communicating with the exhaust duct, and the other side of the suction unit is connected to the intake duct.

[0010] The beneficial effects of the present application are as follows: in the sound-absorbing air duct device, the air supply direction and the air exhaust direction of the airflow passage are at least partially offset, so that the length of the airflow path in the airflow passage is increased, and the airflow will collide in the airflow passage in the process of flowing to the exhaust port, resulting in the loss of airflow energy and the reduction of airflow speed, thereby achieving the effect of primary noise reduction.

[0011] A multi-stage branching assembly is provided in the airflow passage, and each stage of the branching assembly divides the airflow passage into several branching passages to further extend the length of the path in the airflow passage; the dividers divide the airflow, and allow a plurality of auxiliary airflows divided by the main airflow to flow into each branching passage respectively; each stage of the branching assembly can further branch the airflow, so that the contact area between the air and each divider is unnoticeably increased, thereby allowing the sound waves to be fully absorbed in the airflow passage and silenced; and can also avoid the airflow from selecting the shortest path in the airflow passage to be discharged; thus ensuring that the wind resistance parameters in the airflow passage meet the working needs of the cleaning equipment without increasing the equipment or the size of the duct, and at the same time improving the noise removal effect. [Brief description of the drawings]

[0012] The present application will be explained in more detail below with reference to the figures and examples. [Figure 1] FIG. 1 is a structural diagram of the muffler air duct device according to an embodiment of the present application. [Diagram 2] FIG. 2 is a structural diagram of the noise absorbing air duct device according to an embodiment of the present application. [Diagram 3] FIG. 1 is an exploded view of the sound absorbing air duct device according to an embodiment of the present application. [Figure 4] FIG. 1 is an internal structure diagram of the sound-absorbing air duct device according to an embodiment of the present application (the upper cover and sound-absorbing material are omitted). [Diagram 5] FIG. 2 is a structural diagram of the divider according to an embodiment of the present application; [Figure 6] 4 is a schematic diagram of a section of the branching region of the airflow passage according to an embodiment of the present application; FIG. [Figure 7] FIG. 2 is a schematic diagram of the airflow direction of the airflow passage according to an embodiment of the present application. [Figure 8] FIG. 2 is an internal structure diagram of the noise absorbing air duct device according to an embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of the internal airflow direction of the muffler air duct device according to an embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of the structure of the divider and the relationship with the air supply direction according to an embodiment of the present application. [Figure 11] FIG. 2 is an exploded view of the sound absorbing air duct device according to an embodiment of the present application. [Figure 12] FIG. 2 is a schematic diagram of an installation method of the sound-absorbing material according to an embodiment of the present application. [Figure 13] FIG. 4 is an airflow simulation diagram of the airflow passage according to an embodiment of the present application. [Figure 14] FIG. 1 is an assembly diagram of the air duct assembly according to an embodiment of the present application. [Figure 15] FIG. 2 is an assembly diagram of the air duct assembly according to an embodiment of the present application. [Figure 16] FIG. 2 is a simplified structural diagram of the cleaning robot according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present application clearer, the technical solutions of the embodiments of the present application are further described in detail below in combination with the drawings, obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, other embodiments that a person skilled in the art can obtain without any creative efforts all belong to the protection scope of the present application.

[0014] In the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "fixed" should be understood in a broad sense, and may be, for example, fixed connection, detachable connection, or integral molding, mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0015] In this application, unless otherwise clearly specified and limited, a first feature being located "above" or "below" a second feature can include direct contact between the first feature and the second feature, and can also include contact between the first feature and the second feature through another feature between them without direct contact. In addition, a first feature being located "above," "above," and "on the upper surface" of a second feature can include the first feature being located directly above and diagonally above the second feature, or only indicates that the first feature is higher in the horizontal direction than the second feature. A first feature being located "below," "below," and "on the lower surface" of a second feature can include the first feature being located directly below and diagonally below the second feature, or only indicates that the first feature is lower in the horizontal direction than the second feature.

[0016] As shown in Figures 1 and 2, this embodiment provides a noise-reducing air duct device, which is mainly applied to cleaning appliances, and reduces the exhaust noise of cleaning appliances such as cleaning robots by adding multiple branch assemblies 20 to an airflow passage 10, and this noise-reducing air duct device is suitable for the characteristics of cleaning robots, which have a narrow internal installation space and require high space utilization.

[0017] As shown in FIG. 16, this embodiment provides a cleaning robot. The cleaning robot is a kind of intelligent home appliance, also called an automatic vacuum cleaner, an intelligent dust-collecting robot, a dust collector, etc., and can automatically complete cleaning tasks within a location area through a certain artificial intelligence. The cleaning robot generally adopts a brushing and vacuuming method, and first absorbs dust on the ground into its own dust collection box 70, thereby completing the ground cleaning function. The cleaning robot is remotely operated using a remote control, or operated using an operation panel on the main body, and the main body is mainly disk-shaped. It is operated using a rechargeable battery, and generally, cleaning can be scheduled by setting a time and automatically charged. The front part is provided with a sensor that can detect obstacles, and when it touches a wall or other obstacles, it can automatically change direction and take different routes according to the settings of different programs of the system to clean the area in a planned manner. The cleaning robot generates noise when the blower is operating, which affects the user's use and also has a certain impact on the user's health.

[0018] Referring to Fig. 16, it is a schematic diagram of a partial structure of a cleaning robot applied to the sound-absorbing duct device of this embodiment. The cleaning robot generally has a housing (not shown) and a base assembly provided in the housing, the base assembly including a base body 60, and the cleaning robot described in this embodiment is constructed by providing components such as a drive wheel, a battery, and an air duct assembly on the base body 60. The housing can serve to protect the components in the base assembly of the cleaning robot, and a gap may be provided on the housing at a position corresponding to the exhaust port 12 of the sound-absorbing duct device to exhaust the wind blown out from the exhaust port 12 to the outside of the housing.

[0019] However, the above-mentioned dust collection box 70 is used to temporarily store the dust and dirt collected by the cleaning robot, and the dust collection box 70 may be detachably attached to the housing of the cleaning robot or may be fixed to the housing, and a dust exhaust port is provided so that the user can automatically exhaust the dust from the workstation or manually exhaust the dust to clean the collected matter inside. The dust collection box 70 may be provided with a dust suction port and an exhaust port, and the dust suction port may be connected to a dust suction passage (not shown) in the bottom body of the cleaning robot, and the dust suction passage is formed with a dust suction part that communicates with the outside of the cleaning robot, and when the cleaning robot is in use, the dust suction part is directly opposite the ground that the cleaning robot cleans, and the other side of the dust suction part communicates with the air intake passage 321 of the sound-absorbing air duct device through the dust suction passage, the dust collection box 70, and the exhaust duct 52 of the blower 50. The exhaust port of the dust collection box 70 is used to communicate with the intake duct 51 of the blower 50. The blower 50 is the main power output member of the air duct assembly of the cleaning robot, and the blower 50 is used to provide power to create negative pressure in the dust suction passage, thereby sucking the dust on the ground into the dust collection box 70.

[0020] As shown in Figures 14-15, this is an air duct assembly applied to the cleaning robot in this embodiment, and the blower 50 in this embodiment is a member that increases the gas pressure and exhausts the gas by converting input electric energy into mechanical energy. The blower 50 in this embodiment has an intake duct 51 and an exhaust duct 52, and the intake duct 51 may be provided at the top or bottom of the blower 50, and the exhaust duct 52 may be provided at the side of the blower 50, so that the internal space of the cleaning robot can be effectively utilized, and the blower 50 can also achieve a higher wind effect.

[0021] A shock absorbing hose 53 is provided between the exhaust duct 52 and the sound absorbing air duct device. The shock absorbing hose 53 is made of a material having a shock absorbing function, specifically, a soft material such as soft rubber can be used. The shock absorbing hose 53 can reduce the noise of the exhaust duct 52 of the blower 50 by absorbing shock, and can improve the airtightness between the blower 50 and the sound absorbing air duct device, thereby ensuring the stability of the air flow and further increasing the reliability of the air duct assembly.

[0022] Blower 50 includes a housing and a blower member provided in the housing, and a space for providing an air flow is formed between the housing and the blower member, and the space communicates with the environment outside the housing via intake duct 51 and exhaust duct 52, respectively. The housing can protect the blower member and prevent the air flow from leaking to the outside, and exhaust duct 52 is in contact with the direction of rotation of the blower member, so that the air flow inside blower 50 becomes smoother, and the blowing efficiency of blower 50 is improved.

[0023] As shown in Figures 3 to 5, the sound-absorbing air duct device of this embodiment has an airflow passage 10, which restricts the airflow direction of the gas discharged by the blower 50 to provide a passage space for the cleaning robot to discharge gas in the dust suction process, and both ends of the airflow passage 10 are provided with an air inlet 11 and an exhaust port 12 communicating with the external environment, respectively. According to the above solution, in the application process of the cleaning robot, the air inlet 11 is used to communicate with the exhaust duct 52 of the blower 50, and the gas discharged by the exhaust duct 52 may be discharged to the outside of the cleaning robot from the exhaust port 12 through the airflow passage 10. The air intake port 11 and the air exhaust port 12 are respectively used to restrict the air intake direction and the air exhaust direction of the air flow passage 10, and the air intake direction and the air exhaust direction are at least partially offset from each other. The air intake direction and the air exhaust direction are offset from each other, which may be understood as meaning that the air intake direction and the air exhaust direction are at least partially not in the same direction, and may be understood as meaning that the air intake direction and the air exhaust direction are in the same direction, or may be in the same horizontal plane or in different horizontal planes. Since the air intake direction and the air exhaust direction are also at least partially offset from each other, the air flow path in the air flow passage 10 is a turbulent structure that can at least partially disturb the air flow direction, such as bending and curving. When the air flow passes through the air flow passage 10, it collides with the side wall of the air flow passage 10, changes the flow direction, and inevitably generates energy loss, forming a simple labyrinth air duct structure, which causes the air flow energy to be lost, thereby reducing the air flow speed and achieving a rudimentary noise reduction effect.

[0024] In the airflow passage 10, multiple stages of branch assemblies 20 are sequentially provided from the end close to the air intake port 11 to the end close to the air exhaust port 12, i.e., in the airflow direction of the airflow passage 10 from the air intake port 11 to the air exhaust port 12. Each stage of branch assemblies 20 divides the airflow passage 10 into several branch passages 22. The main airflow flowing from the air intake port 11 into the airflow passage 10 may be branched by the branch passages 22, thereby forming several auxiliary airflows. The auxiliary airflows flow into the corresponding branch passages 22, and then flow out of the corresponding branch passages 22. and guided by the duct 22, the auxiliary airflows change their flow direction, thereby lengthening the airflow path of the auxiliary airflows; each auxiliary airflow will lose energy in the process of changing its flow direction, and the flow speed of each auxiliary airflow will be slowed down; a corresponding sound-absorbing structure may be provided in the branch passage 22, so that the sound waves of the auxiliary airflows are buffered and absorbed in the branch passage 22; and because the branch passages 22 partitioned by stages are connected to each other, each auxiliary airflow can merge again when approaching the exhaust port 12, and be discharged into the sound-absorbing air duct device.

[0025] In this embodiment, the structure of the branch passage 22 and the design of the sound-absorbing structure need to ensure that the wind resistance parameters meet the requirements of the cleaning robot in the working process, and ensure that each auxiliary airflow in the branch passage 22 flows smoothly, and when the blower 50 is applied to the cleaning appliance, the negative pressure formed in the intake duct 51 is sufficient to suck in the dust located in the dust suction section.

[0026] Specifically, the branch assembly 20 includes at least one divider 21, and each divider 21 divides the airflow passage 10 into at least two branch passages 22, thereby performing the above-mentioned roles of diffusing and turbulent airflow and guiding sound waves. When the auxiliary airflow flows into the corresponding branch passage 22, the sound waves are absorbed in the branch passage 22 due to repeated contact friction with the sound-absorbing structure provided in the branch passage 22, or when contact friction with the divider 21 occurs, it resonates with the divider 21, thereby consuming and absorbing the sound waves.

[0027] In one embodiment, in any two adjacent branch assemblies 20, the rear divider 21 is provided in one of the branch passages 22 separated by the front divider 21, and the main airflow flowing from the air intake 11 into the airflow passage 10 is branched by the divider 21 in the first stage of the branch assembly 20 provided closest to the air intake 11 to form at least two auxiliary airflows, and then the auxiliary airflows flow within the branch passages 22 separated by the first stage of the branch assembly 20 to be silenced. Each auxiliary airflow is guided to the rear stage branch assembly 20 by the corresponding branch passage 22, and then at least one auxiliary airflow is formed. The auxiliary airflow of the first stage is again branched and disturbed by the subsequent divider 21, and the further branched auxiliary airflow flows into the subsequent branch passage 22 and is further silenced, so that branched airflows of multiple branch passages 22 are formed in the airflow passage 10, and the sound waves of the airflow are successively branched, disturbed and silenced, and then newly branched and disturbed, thereby sufficiently increasing the contact area between each airflow and the divider 21 and the sound absorbing structure, and as a result, the sound waves are buffered by each branch passage 22 and most of the energy is consumed in the branch passage 22, thereby improving the sound absorbing effect of the sound absorbing air duct device on the sound waves of the airflow.

[0028] In this embodiment, at least one side wall of the branch passage 22 is formed by a side of the divider 21, and the other side wall of the branch passage 22 may be determined according to a structure located on the side of the divider 21.

[0029] In one of the cases, the number of dividers 21 in the branching assembly 20 in the same stage is two or more, and any two adjacent dividers 21 in the branching assembly 20 in the same stage are arranged opposite each other, and two branch passages 22 are formed on the opposite sides of the two dividers 21 from the viewpoint of air flow, and these two branch passages 22 finally merge, and the side walls of these two branch passages 22 mentioned above are respectively formed by the two dividers 21 arranged adjacent to each other.

[0030] In another case, when the number of dividers 21 in the branching assembly 20 in the same stage is one, a branch passage 22 is formed between the side of the divider 21 and the inner wall of the sound-absorbing air duct device, or when the number of dividers 21 in the branching assembly 20 in the same stage is two or more, a branch passage 22 is formed between the side of the divider 21 located closest to the inner wall of the sound-absorbing air duct device and the inner wall of the sound-absorbing air duct device.

[0031] According to the above case, each auxiliary airflow can be guided and flow within the branch passages 22 formed between the inner wall of the sound-absorbing air duct device and the dividers 21 and between each of the dividers.

[0032] Of course, in another embodiment, a partition plate may be provided between any two adjacent dividers 21 of the branching assembly 20 of the same stage, and a partition plate may be provided between the dividers 21 and the inner wall of the sound-absorbing air duct device, with the partition plate and the side of the divider 21 forming a branching passage 22.

[0033] Taking the partial structural diagram of the inside of the air flow passage 10 as an example, as shown in Figure 6, in this embodiment, the first-stage branching assembly 20 located closest to the air intake 11 includes one divider 21, and the second-stage branching assembly 20 behind the first-stage assembly 20 includes two dividers 21, and the dividers 21 in the second-stage branching assembly 20 are respectively provided in the paths of the two branch passages 22 separated by the divider 21 of the first-stage branching assembly 20. In this way, the main airflow flowing in from the air intake 11 is divided by the dividers 21 of the first-stage branching assembly 20 to form two auxiliary airflows, and the two auxiliary airflows flow along the branch passages 22 formed on either side of the first-stage divider 21, and then flow into the two dividers 21 of the second-stage branching assembly 20. Then, when the auxiliary airflows come into contact with the second-stage dividers 21, they are divided again into two auxiliary airflows, and finally at least four auxiliary airflows are formed. Each time the airflow is divided, its flow direction, flow speed and amount of air all change, thereby increasing the contact area between each branch passage 22 and the gas therein, and improving the sound wave silencing effect.

[0034] It should be noted that the first stage branching assembly 20 described in this embodiment, i.e., the branching assembly 20 of the first stage branching region in this embodiment, is the branching assembly 20 provided closest to the air intake port 11, the last stage branching assembly 20, i.e., the branching assembly 20 of the sixth stage branching region in this embodiment, is the branching assembly 20 provided closest to the air exhaust port 12, and the second stage branching assembly 20, the third stage branching assembly 20, and the subsequent stage branching assemblies 20 are branching assemblies 20 of the branching regions of each stage sequentially arranged along the airflow direction of the airflow passage 10. The branching assembly 20 of the previous stage refers to the branching assembly 20 of the branching region located in the direction closer to the air intake port 11 than the branching assembly 20 described, and the branching assembly 20 of the subsequent stage refers to the branching assembly 20 of the branching region located in the direction closer to the air exhaust port 12 than the branching assembly 20 described.

[0035] Here, the principle of the noise generated by the exhaust duct 52 of the blower 50 is explained. Because the diameter of the exhaust duct 52 is small, the blowing member will form a large air pressure in the housing of the blower 50 during the rotation process, so when the high-pressure air is discharged from the exhaust duct 52, the high-pressure air will give shock vibration to the outside air and generate noise. Therefore, the faster the rotation speed of the blowing member, the greater the wind pressure in the exhaust duct 52 will be, and the greater the noise generated in the exhaust process of the blower 50. In order to sufficiently reduce the noise of the airflow discharged from the exhaust duct 52 and improve the sound deadening effect on the noise sound waves, it is necessary to make the size of the airflow passage 10 larger than the size of the exhaust duct 52 to provide a sufficient buffer space for the discharged airflow, so that the noise can be buffered and absorbed in the sound deadening air duct device.

[0036] In order to further improve the silencing effect against noise sound waves in a limited installation space of a sound-absorbing air duct device suitable for a cleaning robot, the divider 21 includes a windward portion 211 and an air guide portion 212. It should be noted that the windward portion 211 and the air guide portion 212 may be an integrally molded structure in order to reduce the difficulty of processes such as processing and installation of the divider 21. The windward portion 211 and the air guide portion 212 may be two independent parts, but the two members connected to each other in the air passage structure formed by the two parts are provided in the air flow passage 10 by independent processing, installation, etc.

[0037] In the same divider 21, the windward portion 211 is provided at the end of the divider 21 close to the air intake 11 and is used to divide the airflow passage 10 into at least two spaced apart branch passages 22, and when the airflow flows into the divider 21, the windward portion 211 is the part of the divider 21 that comes into contact with the airflow first, and the windward portion 211 blocks the airflow, changes the direction of the airflow, and branches the airflow into at least two flow paths, and each branched airflow flows into a corresponding branch passage 22. There are at least two air guide sections 212, each of which is provided on opposite sides of the divider 21. Each air guide section 212 forms one side wall of each corresponding branch passage 22. The air guide section 212 is used to guide the airflow direction in the corresponding branch passage 22. Here, since each air guide section 212 matches the airflow path separated by the windward section 211, each airflow branched by the windward section 211 can be guided by the air guide section 212, and the cushioning and absorbing effect of the airflow on noise sound waves can also be improved.

[0038] Specifically, in the same divider 21, the distance between any two adjacent air guide sections 212 is greater than that of the windward section 211, so that a divergent branch passage 22 structure is formed, providing sufficient installation space for the subsequent divider 21 and sufficient flow space for the air.

[0039] In this embodiment, for example, each divider 21 can divide two airflows. The windward portion 211 includes a first branching surface 2111 and a second branching surface 2112 that are provided at an angle, and the first branching surface 2111 and the second branching surface 2112 are used to divide the airflow passage 10 to form a branching passage 22. The first branching surface 2111 is connected to one end of the second branching surface 2112, and the first branching surface 2111 and the second branching surface 2112 can gradually extend along a direction toward the exhaust port 12 away from each other. As shown in FIG. 7, when the main airflow L1 contacts the windward portion 211, it is divided into two auxiliary airflows L2 by the end of the first windward surface that contacts the second windward surface, and the divided two auxiliary airflows L2 flow along the direction guided by the first branching surface 2111 and the second branching surface 2112, and flow into the corresponding air guide portion 212.

[0040] Next, when the windward portion 211 can separate two auxiliary airflows L2, there are two air guide sections 212, and each air guide section 212 includes an air guide surface 2121, one end of the air guide surface 2121 is connected to the first branch surface 2111 or the second branch surface 2112, and the other end of the air guide surface 2121 extends in the airflow direction of the corresponding branch passage 22. Taking the example of the same divider 21 having two air guide sections 212, it can be understood that the air guide surface 2121 includes a first guide surface and a second guide surface, one end of the first guide surface is connected to the first branch surface 2111, one end of the second guide surface is connected to the second branch surface 2112, and the other ends of the first guide surface and the second guide surface are separated from each other and extend toward the exhaust port 12. It should be noted that the airflow path formed by the first branching surface 2111 is coupled to the airflow path of the first guide surface, and the airflow path formed by the second branching surface 2112 is coupled to the airflow path of the second guide surface.

[0041] The spacing between each air guide surface 2121 gradually increases from the end closest to the windward part 211 to the end furthest from the windward part 211. When there are two air guide sections 212, in the process of the two air guide surfaces 2121 extending away from each other, the distance between them gradually increases to form a diffused structure, which provides sufficient installation space for the subsequent divider 21 and sufficient air flow space for the subsequent branch passage 22.

[0042] It can be understood that the shape of the periphery of the divider 21 includes, but is not limited to, one or a combination of a drop shape, a circle, a diamond shape, and a rectangle.

[0043] The above description of the structure of the divider 21 applies when the peripheral portion of the divider 21 has an irregular shape such as a drop shape, diamond shape, rectangle, etc., and the divider 21 in this embodiment adopts a structure in which the peripheral portion has a drop shape.

[0044] Of course, the windward portion 211 may be a flat surface as long as it can achieve the effect of branching the air current.

[0045] Within the airflow passage 10, a first passage 13 and a second passage 14 are formed which are connected to each other, the air intake port 11 is connected to the first passage 13, the air exhaust port 12 is connected to the second passage 14, the number of branch assemblies 20 is greater than two, the first passage 13 has a number of dividers 21 of the branch assemblies 20 of each stage increasing stepwise along the airflow direction, and the second passage 14 has a number of dividers 21 of the branch assemblies 20 of each stage decreasing stepwise along the airflow direction. This not only achieves the effect of the main airflow entering the airflow passage 10 and then being divided into multiple auxiliary airflows, but also achieves the effect of the multiple auxiliary airflows merging into one airflow as they approach the exhaust port 12 and being discharged from the exhaust port 12. The internal structure of the air duct meets the noise reduction requirements of the air duct device, and the volume of the air duct device gradually increases from the air intake port 11 to the exhaust port 12 and then gradually decreases, making the overall volume of the air duct device as small as possible to meet the installation needs of the cleaning robot.

[0046] 6 to 7, the airflow passage 10 is provided with multiple branch regions arranged in sequence along the airflow direction, and the branch assembly 20 is provided in each of the branch regions, and the number of the branch passages 22 partitioned by any two adjacent branch regions increases or decreases stepwise along the airflow direction. Exemplarily, the airflow passage 10 is provided with six branch regions arranged in sequence along the airflow direction, and the first branch region closest to the air supply port 11, i.e., the first branch region 23, includes one divider 21, and the windward part 211 of the divider 21 located in the first branch region 23 is provided toward the air supply port 11, and the main airflow L1 flowing in from the air supply port 11 is branched into the first branch region 23 and partitioned into two auxiliary airflows L2, and the two auxiliary airflows flow along the branch passages 22 provided at an interval from each other. The branching assembly 20 in the latter two-stage branching area 24 includes two dividers 21, and the two dividers 21 located in the two-stage branching area 24 are respectively arranged on the paths of the two branch passages 22 separated by the one-stage branching area 23, and the windward parts 211 of the dividers 21 in the two-stage branching area 24 face in the upwind direction of the branch passages 22 in which they are located, and each branch off two auxiliary airflows L2, thereby separating four auxiliary airflows L3-1, and the auxiliary airflows L3-1 between two adjacent dividers 21 flow along the branch passages 22 for a certain distance before merging to form the merging airflow L3-2. The branch assembly 20 of the three-stage branch region 25 includes three dividers 21, which are respectively provided in the branch passage 22 partitioned by the two-stage branch region, where the divider 21 located in the three-stage branch region 25 is provided in the merging passage and branches the merging airflow L3-2, while the dividers 21 located on both sides branch the auxiliary airflows L3-1 on both sides of the two-stage branch region 24, thereby forming six auxiliary airflows, and the auxiliary airflow L4-1 between two adjacent dividers 21 merges after flowing a certain distance to form the merging airflow L4-2. The branch section of the four-stage branch region 26 includes four dividers 21, and similar to the branching principle of the three-stage branch region 25, the four dividers 21 correspond to and branch the auxiliary airflows L4-1 and the two merging airflows L4-2 on both sides of the three-stage divider 21, respectively.The dividers 21 of the five-stage branching region 27 and the six-stage branching region 28 decrease stepwise, and finally, each auxiliary airflow and the combined airflow merge and are discharged from the exhaust port 12. In this process, the main airflow is divided into a plurality of auxiliary airflows with a flow rate relatively smaller than that of the main airflow, and each auxiliary airflow can be disturbed, buffered, and absorbed stepwise, and finally, the airflows after the noise sound waves are absorbed can be merged again and discharged from the exhaust port 12.

[0047] As shown in Figures 8 and 9, the sound-absorbing air duct device further includes a branching member 80, which may be provided between the air inlet 11 and the branching assembly 20. For example, the branching member 80 may be provided between the air inlet 11 and the first branching region 23 so that the airflow flowing from the air inlet 11 into the airflow passage 10 can pass through the branching member 80 uniformly. It should be noted that the branching member 80 is used to divide the airflow passage 10 into a plurality of guide passages 81, and similar to the arrangement of the dividers 21 in the airflow passage 10, the guide passages 81 are arranged sequentially in the airflow passage 10. Furthermore, in the first branching region 23, when a plurality of branch passages 22 are formed, the branch passages 22 in the first branching region 23 and the guide passages 81 are arranged alternately and communicate with each other, so that a plurality of dividers 21 are provided. For example, as shown in FIG. 9, the main airflow L1 flowing into the airflow passage 10 from the air intake 11 may be branched by the action of the branching member 80 into a number of branch airflows L2 flowing in corresponding to each guide passage 81, and the branch airflows L2 are guided by the branching member 80 to flow toward the one-stage branching region 23 and finally act on the one-stage branching region 23, and by the action of the one-stage branching region 23, each branch airflow L2 flows into a branch passage 22 formed by the corresponding one-stage branching region 23, and finally performs noise reduction and vibration damping on the above airflow.

[0048] By implementing the above-mentioned solution, the main airflow L1 flows relatively uniformly into each guide passage 81 under the action of the branching member 80 to form a branched airflow L2, and the main airflow L1 can be uniformly diffused into each branch passage 22 formed by the one-stage branching area 23 under the guiding action of each guide passage 81 to form a branched airflow L3. In this way, the branched airflow L3 flowing into the branch passage 22 of each one-stage branching area 23 becomes relatively uniform, the efficiency of the interaction between the airflow in the airflow passage 10 and the one-stage branching area 23 is improved, and it is ensured to a certain extent that each divider 21 in the one-stage branching area 23 can form the same noise reduction and vibration damping effect on the two-stage branched airflow, and the airflow is prevented from selecting the shortest route to be discharged in the airflow passage 10.

[0049] It should be explained that the branching member 80 is mainly used to divide the main airflow into multiple branched airflows L2 and uniformly diffuse the branched airflows L2 in the one-stage branching area 23; therefore, the branching member 80 should ensure that the one-stage branched airflow flows relatively smoothly in the guide passage 81, and avoid the airflow being excessively slowed down or disturbed in the guide passage 81, thereby affecting the effect of the subsequent branched airflow L2 being disturbed by the one-stage branching area 23.

[0050] In one embodiment, the guide passage 81 may be formed between any two adjacent branching members 80, or may be formed by cooperation between the branching members 80 and the side wall of the air flow passage 10.

[0051] 8 and 9, the branching member 80 is formed with a guide surface 82 for guiding the airflow from the air intake 11 to the one-stage branching area 23, and the guide surface 82 is provided extending from the end close to the air intake 11 towards the one-stage branching area 23. As a result, the main airflow L1 flows into the guide passage 81 to form a branched airflow L2, and is then guided to a position corresponding to the one-stage branching area 23 in accordance with the extension direction of the guide surface 82.

[0052] Exemplarily, the branching member 80 may be any of other shaped structures such as a plate-like structure, a block-like structure, and the branching member 80 may be provided with at least two guide surfaces 82. Taking the example of a divider having a plate-like structure and two guide surfaces 82 provided thereon, the two guide surfaces 82 are formed on the plate surfaces on both opposing sides of the divider, respectively, and the guide passage 81 may be formed between any guide surface 82 and the side wall of the airflow passage 10, or, in the case where a plurality of dividers are provided, may be formed between any two adjacent and opposing guide surfaces 82 provided thereon.

[0053] In order to reduce the effect of the guide surface 82 on the airflow speed and other airflow parameters and ensure that the one-stage branched airflow can be quickly branched into a one-stage branched airflow by the branching member 80 and then flow into the one-stage branching area 23, the guide surface 82 may be curved or flat.

[0054] Continuing to refer to Figures 8 to 10, the guide surface 82 in this embodiment is provided as a curved surface that gradually bends from the end close to the air intake 11 towards the one-stage branching region 23, and in this manner, the airflow may be guided by the curved branching surface within the guide passage 81, whereby the airflow may flow more smoothly through the one-stage branching region 23 and turbulence treatment may be performed.

[0055] In one embodiment, the end of the guide surface 82 close to the air supply port 11 is in contact with the air supply direction so that the flow speed and flow direction of the main airflow when it flows into the corresponding guide passage 81 are not excessively disturbed. Also, the angle α between a straight line L5 connecting both opposing ends of the guide surface 82 and an extension line of the air supply direction L6 of the air supply port 11 is 0° to 70°. Exemplarily, the branching member 80 is formed with a first end close to the air supply port 11 and a second end remote from the air supply port 11 at both opposing ends in the airflow direction, and the straight line L5 may be understood as a straight line connecting the first end and the second end of the branching member 80. The air supply direction L6 may be understood as the airflow direction at the position of the first end of the branching member 80. In practical application, when multiple airflows flow into the airflow passage 10 from the air supply port 11 and flow to the corresponding branching member 80 along the airflow direction, each airflow is cut and branched by the corresponding branching member 80, and at this time, the airflow direction of the airflow corresponding to the first end of the branching member 80 is defined as the air supply direction L5. It can be understood that the passage structure between the air supply port 11 and the branching member 80 may be a straight passage, an arc passage, etc., but regardless of the passage structure between the branching member 80 and the air supply port 11, the flow direction of the airflow that finally contacts the position of the first end of the corresponding branching member 80 is the air supply direction L6. By providing guide surface 82 between air intake 11 and the one-stage branching area 23 in the above structural form, guide surface 82 can guide the corresponding first branched airflow to a position corresponding to the one-stage branching area 23, while at the same time ensuring that the first branched airflow is less susceptible to the influence of guide surface 82, and preventing the first branched airflow from generating additional turbulence at the end of guide surface 82 close to the one-stage branching area 23.

[0056] Based on the structural form of the branching member 80, the end of the branching member 80 close to the air inlet 11 may be provided as an arc structure, and both sides of the arc structure are in contact with the guide surfaces 82 arranged on the corresponding both sides of the branching member 80. In this way, when the main airflow L1 first contacts the branching member 80, the main airflow L1 acts on the arc structure at the end of the branching member 80, and the arc structure can divide the main airflow into two one-stage branch airflows and guide them into the guide passages 81 corresponding to both sides, thereby maximally reducing the turbulence that occurs when the main airflow impacts the end of the branching member 80.

[0057] In another embodiment, the end of the branching member 80 close to the air inlet 11 may be provided as a cone-shaped structure.

[0058] 8 to 10, the first-stage branch region 23 of this embodiment includes at least two dividers 21 arranged side by side with a gap therebetween, and the dividers 21 of the first-stage branch region 23 divide the airflow passage 10 into at least two branch passages 22, thereby performing the above-mentioned roles of diffusing and turbulent airflow, and guiding sound waves. When airflow flows through the branch passage 22 of the first-stage branch region 23, sound waves in the airflow are absorbed to some extent in the branch passage 22 formed in the first-stage branch region 23 due to repeated contact friction between the first-stage branch region 23 and the sound-absorbing structure provided in the branch passage 22. When contact friction occurs between the airflow and the dividers 21, the airflow resonates with the dividers 21, and the sound waves of the first-stage branch airflow are consumed and absorbed.

[0059] In order to ensure that the branched airflow L2 can act correspondingly on each of the dividers 21 of one branching region 23, the dividers 21 of one branching region 23 and the branching members 80 are alternately arranged. The installation manner is as follows:

[0060] The end of the branching member 80 close to the first branching region 23 is provided directly opposite the branch passage 22 of the first branching region 23, The divider 21 of the first branching region 23 is provided directly opposite the guide passage 81.

[0061] By configuring it as described above, the branched airflow L2 flowing out from the guide passage 81 can act on the divider 21 corresponding to the corresponding guide passage 81, and it can be ensured that the branched airflow L2 is sufficiently acted on by each divider 21 in one stage of branching area 23, branched, and diffused into the branch passages 22 in the corresponding one stage of branching area 23.

[0062] In one embodiment, in order to ensure that the branched airflow L2 can act on each divider 21 in the one-stage branch region 23 at a corresponding position, the number of branch passages 22 in the one-stage branch region 23 in this embodiment is set to n, where n≧3, and the number of guide passages 81 is n−1 correspondingly. As shown in Fig. 9, when the number of branch passages 22 provided in the one-stage branch region 23 is five, the number of corresponding guide passages 81 is four.

[0063] In other embodiments, since there is no correspondence between the number of branch passages 22 in one stage of branch region 23 and the number of guide passages 81, if the number of branch passages 22 in one stage of branch region 23 continues to be set to five, the corresponding number of guide passages 81 may also be set to two, three, etc.

[0064] In this way, the branched airflow L2 can flow uniformly into the first-stage branching area 23, and as a result, the branched airflow L3 in each branch passage 22 of the first-stage branching area 23 becomes even more uniform, making it easier to further perform noise removal and vibration damping processing on the subsequent second-stage branching area 24, third-stage branching area 25, etc.

[0065] In this embodiment, referring to Figs. 11 and 12, a sound absorbing material 40 is provided within the air flow passage 10 in order to further improve the sound deadening effect.

[0066] In one embodiment, sound absorbing material 40 may be fitted to the periphery of each divider 21, As an embodiment that can be implemented independently of the above embodiment or in conjunction with the above embodiment, the sound absorbing material 40 may be provided around the inner wall of the air duct housing 30, In this embodiment, the sound-absorbing material 40 may be filled in the air flow passage 10, specifically, the sound-absorbing material 40 is filled in each branch passage 22, and in order to reduce the impact on the air flow in the branching process, the sound-absorbing material 40 is not provided in the guide passage 81, that is, the sound-absorbing material 40 is provided between the branching member 80 and the exhaust port 12.

[0067] According to the technical solution provided above, refer to FIG. 13, which is a simulation diagram of the airflow passage 10 of the sound-absorbing air duct device in this embodiment. As can be seen, through the action of the branching member 80, the high-speed main airflow (the light-colored part close to the air intake port 11) can be evenly branched and flow into the first-stage branching area 23, and as the airflow passes through the first-stage branching area 23, the second-stage branching area 24, the third-stage branching area 25..., the airflow tends to gradually become smoother (the color gradually becomes more uniform), so that the airflow can be smoothly discharged at the exhaust port 12, thereby achieving the effects of noise elimination and vibration damping.

[0068] As shown in FIG. 4, the sound absorbing air duct device further includes an air duct housing 30 which is hollow and forms an air flow passage 10, and both the air intake port 11 and the air exhaust port 12 are opened in the air duct housing 30. Since each divider 21 is provided within the air duct housing 30, each branch passage 22 is formed within the air duct housing 30, and gaps are provided on the surface of the air duct housing 30 directly opposite the air inlet 11 and the exhaust port 12. The air duct housing 30 may be provided with an air guide duct 31 extending from the air duct housing 30 at the position of the exhaust port, and an exhaust flow path 311 is formed within the air guide duct 31, thereby restricting the flow direction of the gas discharged from the sound-absorbing air duct device. The air duct housing 30 may be provided with an air duct connecting pipe 32 extending from the air duct housing 30 at the position of the air inlet 11, and an air intake flow path 321 is formed within the air duct connecting pipe 32, thereby restricting the flow direction of the gas flowing into the sound-absorbing air duct device. This facilitates the connection between the sound-absorbing air duct device and the blower 50.

[0069] Specifically, the cross-sectional shapes of the air supply passage 321 and the exhaust passage 311 may be of various shapes, including but not limited to circular, square, trumpet-shaped, or other irregular shapes.

[0070] After the above-mentioned branch passage 22 is formed, if the number of dividers 21 in the branch assembly 20 of the same stage is two or more, a branch passage 22 is formed between the side walls of the dividers 21 provided on both opposing sides of the branch assembly 20, i.e., the guide portions, and the inner walls of the air duct housing 30.

[0071] In another case, when the number of dividers 21 in the branching assembly 20 in the same stage is one, a branch passage 22 is formed between the side portion, i.e., the guide portion, of the divider 21 and the inner wall of the air duct housing 30 .

[0072] As shown in Fig. 3, in order to facilitate the manufacture, 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 cover each other, the air flow passage 10 may be formed by assembling and enclosing the upper and lower housings, and the divider 21 may be provided in the upper or lower housing, and the processing efficiency can be improved by integral molding in the processing process. The upper housing and the lower housing described in this embodiment are specifically two housings, one relatively close to the cleaning robot and one relatively far from the cleaning robot in the state where the sound-absorbing air duct device is attached to the cleaning robot, and the housing relatively close to the cleaning robot is defined as the lower housing and the housing relatively far from the cleaning robot is defined as the upper housing, and the upper cover 33 and the lower cover 34 may be detachably connected by a buckle or fixedly connected by a screw connection or the like.

[0073] Optionally, the materials of the air guide portion 212, the upper cover 33 and the lower cover 34 include, but are not limited to, one or a combination of resin materials, plastic materials, and metal materials.

[0074] In order to allow the divider 21 to be in sufficient contact with the air in the airflow passage 10 and to branch and diffuse the airflow flowing through the divider 21 in the airflow passage 10, one end of the divider 21 is provided on the lower cover 34, and after the upper cover 33 and the lower cover 34 are covered, the other end of the divider 21 can abut against the upper cover 33, so that it can be understood that the divider 21 is positioned laterally between the upper cover 33 and the lower cover 34.

[0075] In order to improve the sound deadening effect, sound absorbing material 40 is provided within the air flow passage 10.

[0076] In one embodiment, the divider 21 includes a divider body integrally molded with the air duct housing 30 and a sound-absorbing material 40 fitted around the peripheral edge of the divider body. Compared with a solution in which the divider body and the air duct housing 30 are processed separately and then assembled and connected, the divider body integrally molded with the air duct housing 30 does not require an assembly structure or the need to leave an installation position between the air duct housing 30 and the divider body, which is more advantageous in manufacturing and processing the device.

[0077] In another embodiment, the sound absorbing material 40 is provided around the interior walls of the air duct housing 30 .

[0078] It can be seen that by configuring the sound-absorbing material 40 and the divider body as different materials, the divider 21 can branch the airflow and bring as much air into contact with the sound-absorbing material 40 as possible. The airflow is branched into at least two airflows by the divider 21, and each airflow can come into contact with the sound-absorbing material 40. Compared to simply bringing the sound-absorbing material 40 into contact with the airflow, the branching process reduces the speed of the airflow and increases the contact area between the air and the sound-absorbing material 40, thereby improving the sound-absorbing effect of the sound-absorbing air duct device.

[0079] Of course, sound-absorbing material 40 may also be provided on both the upper and lower sides to surround and form the air flow passage 10 of the upper and lower housings, but a certain gap is required between the sound-absorbing materials 40 located on the upper and lower housings to ensure that the air can pass smoothly through the branch passage 22.

[0080] Specifically, the sound absorbing material 40 may have a sheet-like structure or a block-like structure, and when the sound absorbing material 40 has a sheet-like structure, the sound absorbing material 40 may be provided on the inner wall of the air duct housing 30 or on the peripheral portion of each divider 21 by sticking, inserting, or the like. When the sound absorbing material 40 has a block-like structure, the sound absorbing material 40 may be provided so as to fill the ventilation space.

[0081] The sound absorbing material 40 provided in this embodiment has a sheet-like structure and is attached to the outer peripheral walls of each divider 21 and the inner wall of the air duct housing 30.

[0082] It should be noted that the sound absorbing material 40 may be used to reduce noise caused by the exhaust of the blower 50 during the operation of the cleaning robot, and the selection of the sound absorbing material 40 should satisfy several necessary conditions. For example, the sound absorbing material 40 should be a breathable material, or the wind resistance of the sound absorbing material 40 should not be too large, so that the sound absorbing material 40 can perform a noise reduction process on the airflow passing through it without affecting the normal operation of the blower 50. The sound absorbing material 40 should be a material with a high noise reduction effect so that it can reduce noise to a minimum and improve the user experience.

[0083] In this embodiment, the sound-absorbing material 40 is sound-absorbing cotton, but the material of the sound-absorbing cotton is not limited to fiber cotton, polyurethane sound-absorbing cotton, sponge, pearl cotton, etc., and its thickness is not limited. The internal structure of the sound-absorbing cotton is mesh-like, and when noise is transmitted to the surface of the sound-absorbing cotton, part of the noise is reflected by the sound-absorbing cotton, and the reflected noise offsets the subsequent noise transmitted in the direction of the sound-absorbing cotton, achieving the effect of one-time sound deadening, and part of the noise passes through the sound-absorbing cotton and is absorbed by the sound-absorbing cotton, and the other part of the noise is transmitted by its own vibration and disappears when it rubs against the surrounding medium, finally achieving the sound deadening effect.

[0084] In one embodiment, the sound-absorbing cotton is a material made by processing one or more different fibers through various processes, among which polyester sound-absorbing cotton has better sound-absorbing and noise-reducing effects. The polyester sound-absorbing cotton is made by thermally pressing 100% polyester fibers with advanced technology to form it into a silk-like shape, and has good breathability. At the same time, the polyester sound-absorbing cotton has a sound absorption coefficient of 0.94 in the noise range of 125 to 4000 Hz, so it can absorb the noise generated by the exhaust of the blower 50 to the maximum extent.

[0085] Since the ventilation space has a certain length, when the noise flows through each branch passage 22 along with the airflow, the frequency band of the noise attenuates continuously with distance and time; therefore, in the process of the noise flowing through each branch passage 22 along with the airflow direction, the frequency band of the noise becomes lower; in view of this, in order to improve the silencing effect against noise of different frequency bands, the preset energy absorption frequency band of the sound-absorbing material 40 closer to the air intake 11 side is made higher than the preset energy absorption frequency band of the sound-absorbing material 40 closer to the exhaust 12 side, so as to make the frequency band range covered by the silencing frequency band of the sound-absorbing air duct device wider, and improve the applicability of the sound-absorbing air duct device.

[0086] Finally, it should be explained that the sound-absorbing air duct device in this embodiment cannot achieve a complete sound-absorbing effect on the blower 50 and the airflow discharged by the blower 50, but only reduces the noise, and the user can almost ignore the reduced noise when applying the sound-absorbing air duct device to the corresponding cleaning appliance.

[0087] In the description herein, reference to terms such as "one embodiment," "example," and the like means that the 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 application. As used herein, exemplary expressions of such terms do not necessarily refer to the same embodiment or example.

[0088] In addition, although the present specification is described according to the embodiments, it should be understood that each embodiment does not include only one independent technical solution, and the description manner of the specification is for clarity only, and those skilled in the art should understand the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that are understandable to those skilled in the art.

[0089] The technical principles of the present application have been described in combination with specific examples. These descriptions are only intended to interpret the principles of the present application, but cannot be construed as limiting the scope of protection of the present application in any manner. Based on the interpretation herein, a person skilled in the art may come up with other specific embodiments of the present application without making creative efforts, and all of these modes are within the scope of protection of the present application. [Explanation of symbols]

[0090] 10 air flow passage, 11 air intake port, 12 exhaust port, 13 first passage, 14 second passage, 20 branch assembly, 21 divider, 211 windward portion, 2111 first branch surface, 2112 second branch surface, 212 air guide portion, 2121 air guide surface, 22 branch passage, 23 first branch area, 24, second branch area, 25 third branch area, 26 fourth branch area, 27 fifth branch area, 28 sixth branch area, 30 air duct housing, 31 air guide duct, 311 exhaust flow path, 32 air duct connecting pipe, 321 intake flow path, 33 upper cover, 34 lower cover, 40 sound absorbing material, 50 blower, 51 intake duct, 52 exhaust duct, 53 shock absorbing hose, 60 base body, 70 Dust collection box, 80 branching member, 81 guide passage, 82 guide surface.

Claims

1. A sound-absorbing air duct device, comprising: an airflow passage, the airflow passage having an air inlet and an air outlet at both ends thereof, the air inlet and the air outlet being used to restrict an air inlet direction and an air outlet direction of the airflow passage, respectively; In the airflow passage, a multi-stage branching assembly is provided between the air intake port and the air exhaust port, and the branching assembly of each stage divides the airflow passage into several branching passages, and the branching passages divided by the branching assemblies of each stage are connected to each other, The branching assembly includes at least one divider, each divider dividing the airflow passage into at least two branching passages.

2. 2. The sound-absorbing air duct device according to claim 1, wherein, in any two adjacent branch assemblies, the divider of the rear branch assembly is provided in one of the branch passages separated by the divider of the front branch assembly.

3. The divider comprises: a windward section provided at an end of the divider close to the air inlet and used to divide the airflow passage into at least two spaced apart branch passages; 3. The noise-reducing air duct device according to claim 2, further comprising at least two air guide sections provided on the sides of the divider and forming side walls of the corresponding branch passages, the air guide sections being used to guide the air flow direction in the corresponding branch passages.

4. 4. The noise-reducing air duct apparatus according to claim 3, wherein the distance between any two adjacent air guide sections is equal to or greater than the windward section.

5. the windward portion includes a first branching surface and a second branching surface that are provided at an angle, the first branching surface and the second branching surface are used to divide the airflow passage to form the branch passage, 4. The noise-reducing air duct device according to claim 3, wherein the air guide portion includes an air guide surface, one end of the air guide surface is connected to the first branch surface or the second branch surface, and the other end of the air guide surface extends along the air flow direction of the corresponding branch passage.

6. 6. The noise absorbing air duct apparatus according to claim 5, wherein, in the same divider, the intervals between the air guide surfaces gradually increase from the end closer to the windward direction to the end farther from the windward direction.

7. 2. The noise absorbing air duct device according to claim 1, wherein the shape of the periphery of the divider is one or a combination of a plurality of shapes selected from the group consisting of a drop shape, a circle, a rhombus, and a rectangle.

8. The airflow passage has multiple branch areas arranged in sequence along an airflow direction, and the branch assembly is provided in each of the branch areas; The sound-absorbing air duct device according to any one of claims 1 to 7, characterized in that the number of branch passages partitioned by any two adjacent branch areas increases or decreases stepwise along the airflow direction.

9. The air flow passage is formed with a first passage and a second passage that are connected to each other, the air inlet is in communication with the first passage, and the air outlet is in communication with the second passage, the number of said branch assemblies is greater than two; The first passage has a number of the dividers of the branching assemblies that increases stepwise along an airflow direction, The noise-reducing air duct apparatus according to any one of claims 1 to 7, characterized in that the number of the dividers of the branching assemblies in each stage of the second passage decreases stepwise along the airflow direction.

10. The sound-absorbing air duct device according to any one of claims 1 to 7, further comprising a branching member provided between the air inlet and the branching assembly, the branching member being used to divide the air flow passage into a guide passage, the guide passage being used to guide the air flow to the divider.

11. The divider is formed with a guide surface for guiding the airflow from the air inlet to the divider, and the guide surface is provided extending from an end portion close to the air inlet toward the divider, 11. The noise absorbing air duct apparatus according to claim 10, wherein the guide surface is a curved surface or a flat surface.

12. The sound-absorbing air duct device according to claim 11, characterized in that an angle α between a straight line L5 connecting both opposing ends of the guide surface and the air supply direction of the air supply port 11 is 0° to 70°.

13. The sound absorbing air duct device is The sound-absorbing air duct device according to any one of claims 1 to 7, further comprising an air duct housing having a hollow interior and forming the air flow passage, and both the air intake port and the air exhaust port are opened in the air duct housing.

14. 14. The noise-reducing air duct device according to claim 13, wherein a sound-absorbing material is provided in the air flow passage.

15. 15. The noise-reducing air duct device according to claim 14, wherein the divider includes a divider body integrally formed with the air duct housing, and a sound absorbing material fitted to a peripheral portion of the divider body.

16. 15. The noise absorbing air duct arrangement of claim 14, wherein the sound absorbing material is provided around the inner wall of the air duct housing.

17. 15. The noise-absorbing air duct device according to claim 14, characterized in that the preset energy absorption frequency band of the sound absorbing material closer to the air inlet side is higher than the preset energy absorption frequency band of the sound absorbing material closer to the air outlet side.

18. an air intake passage and an exhaust passage are provided at both ends of the air flow passage, the air intake passage and the exhaust passage are communicated via the air flow passage, the air intake port is communicated corresponding to the air intake passage, and the exhaust port is communicated corresponding to the exhaust passage, 2. The noise reducing air duct arrangement of claim 1, wherein the air intake passages are at least partially offset to define at least one upwind location within the airflow passage.

19. 20. The noise absorbing air duct system of claim 18, wherein the cross-sectional area of ​​the intake air passage is smaller than the cross-sectional area of ​​the exhaust air passage.

20. 20. The noise-reducing air duct system according to claim 1, 18 or 19, wherein the area of ​​the exhaust port is larger than the area of ​​the intake port.

21. 2. The noise-reducing air duct arrangement according to claim 1, characterized in that the air intake direction and the air exhaust direction are at least partially offset from each other.

22. 1. An air duct assembly comprising: The sound absorbing air duct device according to claim 1 ; a blower having an exhaust duct communicating with the airflow passage through the air intake port.

23. 23. The air duct assembly according to claim 22, characterized in that a shock absorbing hose is provided between the exhaust duct and the sound absorbing air duct device.

24. A cleaning robot, An air duct assembly according to claim 22 or 23; A cleaning robot comprising a dust suction unit, one side of which is in communication with an external environment of the cleaning robot, the blower further having an intake duct in communication with the exhaust duct, the other side of the dust suction unit being connected to the intake duct.

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