Air duct structure and sweeping robot

Abstract

The application provides a kind of air duct structure and floor cleaning robot, belong to cleaning technical field.The air duct structure includes fan, first flow guide pipe and second flow guide pipe;The first air inlet and the first air outlet are formed on the casing of the fan;The first flow guide pipe is communicated with the first air inlet, and the second flow guide pipe is communicated with the first air outlet;The caliber of the second air inlet of the first flow guide pipe is larger than the caliber of the first air inlet;The second flow guide pipe has acceleration zone and slow flow zone, and the caliber of the acceleration zone gradually decreases from the end close to the first air outlet to the end away from the first air outlet;The caliber of the slow flow zone gradually increases from the end close to the acceleration zone to the end away from the acceleration zone.By setting the acceleration zone and the slow flow zone in the second flow guide pipe, resonance of gas flowing in the second flow guide pipe is avoided, thereby reducing the noise generated by gas in the second flow guide pipe.

Description

Technical Field

[0001] This invention relates to the field of cleaning equipment technology, and in particular to an air duct structure and a sweeping robot. Background Technology

[0002] The surface cleaning device uses an internal fan to draw in dust from the ground along with the air, trapping the dust in a dust box, while the clean air is discharged through the duct.

[0003] Surface cleaning devices typically use fans as power sources. When the fan is operating, the gas flows through the pipes, colliding with the inner walls of the pipes and generating noise. Furthermore, during the cleaning process, surface cleaning devices sometimes need to increase the fan's operating power to improve cleaning efficiency. The faster the fan runs, the faster the gas flows through the pipes, resulting in greater noise from the collisions with the inner walls, thus affecting the user experience.

[0004] Therefore, it is worthwhile to study how to reduce the collision force between airflow and the intake and exhaust pipes, and how to reduce the noise generated by airflow during the flow in the pipes. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an air duct structure and a sweeping robot.

[0006] The present invention provides the following technical solution: a duct structure, comprising a fan, a first guide pipe, and a second guide pipe;

[0007] The casing of the fan has a first air inlet and a first air outlet;

[0008] The first guide pipe is connected to the first air inlet, and the second guide pipe is connected to the first air outlet;

[0009] The diameter of the second air inlet of the first air guide pipe is larger than the diameter of the first air inlet;

[0010] The second flow guide duct has an acceleration zone and a slow flow zone. The acceleration zone is located at the end of the second flow guide duct closer to the first air outlet, and the slow flow zone is located at the end of the second flow guide duct farther from the first air outlet.

[0011] The diameter of the acceleration zone gradually decreases from the end closest to the first air outlet to the end furthest from the first air outlet;

[0012] The diameter of the slow-flow zone gradually increases from the end closer to the acceleration zone to the end farther away from the acceleration zone.

[0013] Furthermore, the ratio between the length of the acceleration zone and the length of the slow flow zone is x, where the value of x is in the range of 0.2 ≤ x ≤ 1.

[0014] Furthermore, the housing includes an upper housing and a lower housing;

[0015] The outer wall of the upper housing is provided with a plurality of spaced-apart first limiting protrusions, and the outer wall of the lower housing is provided with a plurality of spaced-apart first connecting buckles. Each first connecting buckle engages with a first limiting protrusion to form the housing.

[0016] Furthermore, the first flow guide pipe includes a first connecting shell and a second connecting shell;

[0017] The first connecting shell has a first mounting groove on its edge, and the second connecting shell has a first flange on its edge. The first flange engages with the first mounting groove to form the first flow guide pipe.

[0018] The sidewall of the first connecting shell is provided with a plurality of spaced-apart first connecting members, and the sidewall of the second connecting shell is provided with a plurality of spaced-apart second connecting members, each of the first connecting members being connected to one of the second connecting members.

[0019] Furthermore, the inner wall of the first connecting shell is provided with at least one limiting groove, and the inner wall of the second connecting shell is provided with at least one limiting post;

[0020] The number of the limiting grooves is equal to the number of the limiting posts, and one limiting post is inserted into one limiting groove.

[0021] Furthermore, a sealing sleeve is provided between the second guide pipe and the first air outlet of the housing.

[0022] Furthermore, the second flow guide pipe includes a third connecting shell and a fourth connecting shell;

[0023] The edge of the third connecting shell is provided with a first connecting platform, and the edge of the fourth connecting shell is provided with a second connecting platform. The first connecting platform and the second connecting platform are connected to each other to form the second flow guide pipe.

[0024] The sidewall of the third connecting shell is provided with a plurality of spaced-apart third connecting members, and the sidewall of the fourth connecting shell is provided with a plurality of spaced-apart fourth connecting members, each of the third connecting members corresponding to one of the fourth connecting members.

[0025] Furthermore, the inner walls of the acceleration zone and the slow-flow zone are both smooth curved surfaces. Furthermore, the housing is a volute.

[0026] Some embodiments of the present invention also provide a sweeping robot, including a sweeping robot body and the aforementioned air duct structure.

[0027] The embodiments of the present invention have the following advantages: By setting a first guide pipe at the first air inlet of the fan, and the diameter of the second air inlet being larger than that of the first air inlet, the gas velocity at the second air inlet is reduced to be lower than that at the first air inlet during fan operation. In other words, increasing the diameter of the second air inlet reduces noise generated at the second air inlet of the first guide pipe. By reducing the diameter of the acceleration zone, the flow velocity of air discharged through the first air outlet entering the acceleration zone is increased, thereby increasing the air flow velocity in the second guide pipe. By increasing the diameter of the slow-flow zone, the gas velocity gradually decreases as the gas enters the slow-flow zone, reducing the collision force between the gas and the inner wall of the second guide pipe, thus reducing noise generated when the gas flows through the second guide pipe. By setting an acceleration zone and a slow-flow zone in the second guide pipe, resonance is avoided during gas flow in the second guide pipe, thereby reducing noise generated by the gas in the second guide pipe.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This diagram shows a structural schematic of a duct structure provided by some embodiments of the present invention from one perspective;

[0031] Figure 2 An exploded view of a duct structure provided by some embodiments of the present invention is shown.

[0032] Figure 3 An exploded view from another perspective of a duct structure provided by some embodiments of the present invention is shown;

[0033] Figure 4 An exploded view of a second flow guide pipe in a duct structure provided by some embodiments of the present invention is shown;

[0034] Figure 5 The diagram shows a schematic view of a second flow guide pipe in a duct structure provided by some embodiments of the present invention.

[0035] Explanation of key component symbols:

[0036] 100-Fan; 200-First guide pipe; 300-Second guide pipe; 120-Casing; 121-First air inlet; 122-First air outlet; 210-Second air inlet; 310-Acceleration zone; 320-Slow flow zone; 123-Upper housing; 124-Lower housing; 123a-First limiting protrusion; 124a-First connecting buckle; 220-First connecting shell; 230-Second connecting shell; 221-First mounting groove; 231-First flange; 222-First connector; 232-Second connector; 223-Limiting groove; 233-Limiting post; 400-Sealing sleeve; 330-Third connecting shell; 340-Fourth connecting shell; 331-First connecting platform; 341-Second connecting platform; 332-Third connector; 342-Fourth connector. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figures 1 to 3 As shown, some embodiments of the present invention provide an air duct structure for use in a robotic vacuum cleaner, which can reduce the noise generated by the robotic vacuum cleaner during cleaning and dust extraction, and improve the user experience.

[0043] The air duct structure includes a fan 100, a first guide pipe 200, and a second guide pipe 300. In some embodiments of the present invention, the fan 100 may be a centrifugal fan, an axial fan, a mixed-flow fan, or a cross-flow fan. In this embodiment, the fan 100 is a centrifugal fan.

[0044] In addition, the housing 120 of the fan 100 has a first air inlet 121 and a first air outlet 122, which are connected through a cavity inside the housing 120.

[0045] It should be noted that when the fan 100 is running, external air enters the fan 100 through the first air inlet 121 and is discharged from the first air outlet 122 to form an airflow.

[0046] Meanwhile, the first guide pipe 200 is disposed on the side wall of the housing 120 and is connected to the first air inlet 121. Specifically, the air outlet of the first guide pipe 200 is connected to the first air inlet 121.

[0047] In order to reduce the noise generated when outside air is discharged from the first air outlet 122 through the first guide duct 200 and the fan 100, in this embodiment, the diameter of the second air inlet 210 of the first guide duct 200 is larger than the diameter of the first air inlet 121. It is understood that the first guide duct 200 has a second air inlet 210, and the second air inlet 210 is located at the end of the first guide duct 200 away from the first air inlet 121.

[0048] It should be noted that because the diameter of the second air inlet 210 is larger than that of the first air inlet 121, when the fan 100 is running, the gas velocity at the second air inlet 210 is lower than that at the first air inlet 121. This means that increasing the diameter of the second air inlet 210 reduces the noise generated at the second air inlet 210 of the first guide pipe 200. Understandably, when the wind speed decreases, the noise also decreases.

[0049] In addition, as external gas enters the fan 100 through the first guide pipe 200, the flow velocity of the gas in the first guide pipe 200 gradually increases. Therefore, in order to reduce the noise generated by the collision between the gas entering the first guide pipe 200 and the inner wall of the first guide pipe 200, the inner wall of the first guide pipe 200 is made into a smooth curved surface. This allows the gas to flow along the smooth curved inner wall when it enters the first guide pipe 200. When the gas contacts the inner wall of the first guide pipe 200, the force of the gas colliding with the inner wall of the first guide pipe 200 forms a component force along the curved surface, reducing the vertical collision force between the gas and the inner wall of the first guide pipe 200, thereby reducing the noise generated during the flow of gas in the first guide pipe 200.

[0050] In some embodiments of the present invention, in order to reduce the noise generated when external gas enters the fan 100, the housing of the fan 100 is configured as a volute, so that the gas entering the fan 100 through the first guide pipe 200 forms a spiral airflow on the inner wall of the volute-shaped housing of the fan 100, thereby reducing the noise generated by the collision between the gas and the housing of the fan 100.

[0051] Meanwhile, by connecting the second guide pipe 300 to the first air outlet 122, it can be understood that the gas discharged through the first air outlet 122 enters the second guide pipe 300 and is discharged from the air outlet in the second guide pipe 300.

[0052] Specifically, in order to reduce the noise of gas in the second guide pipe 300 and reduce the noise generated by the gas discharged from the first air outlet 122 of the fan 100, the second guide pipe 300 has an acceleration zone 310 and a slow flow zone 320, wherein the acceleration zone 310 is located at the end of the second guide pipe 300 near the first air outlet 122.

[0053] It should be noted that the acceleration zone 310 is used to increase the flow rate of gas entering the second guide pipe 300, so as to increase the flow rate of gas when it is discharged through the acceleration zone 310.

[0054] Specifically, in this embodiment, the diameter of the acceleration zone 310 is smaller than the diameter of the first air outlet. By reducing the diameter of the acceleration zone 310, the flow velocity of the air discharged through the first air outlet when entering the acceleration zone 310 is increased.

[0055] Furthermore, the slow-flow zone 320 is located at the end of the second guide pipe 300 away from the first air outlet 122. It should be noted that the diameter of the slow-flow zone 320 is larger than the diameter of the acceleration zone 310. By increasing the diameter of the slow-flow zone 320, the gas velocity gradually decreases when the gas enters the slow-flow zone 320, thereby reducing the collision force between the gas and the inner wall of the second guide pipe 300, and thus reducing the noise generated when the gas flows through the second guide pipe 300.

[0056] In some embodiments of the present invention, by providing an acceleration zone 310 and a slow flow zone 320 in the second flow guide duct 300, resonance is avoided during the flow of gas in the second flow guide duct 300, thereby reducing the noise generated by the gas in the second flow guide duct 300.

[0057] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, in order to increase the flow velocity of the gas after it is discharged from the first outlet 122 of the fan 100, the acceleration zone 310 is disposed between the air inlet of the second guide pipe and the slow flow zone 320.

[0058] It should be noted that by setting up the acceleration zone 310 to increase the gas flow velocity, the initial power of the gas flow in the second guide pipe 300 is increased, thereby improving the gas flow efficiency in the second guide pipe 300.

[0059] Specifically, the diameter of the acceleration zone 310 gradually decreases from the end near the first air outlet 122 to the end away from the first air outlet 122. It can be understood that as the diameter of the second guide pipe 300 gradually decreases, the gas flow rate gradually increases.

[0060] In this embodiment, in order to reduce the noise generated during the flow of gas in the acceleration zone 310, the inner wall of the acceleration zone 310 is a smooth curved surface, and the extension direction of the curved surface is the same as the flow direction of the gas in the acceleration zone 310, so as to reduce the noise generated by the collision between the gas and the inner wall of the acceleration zone 310 during the flow of gas in the acceleration zone 310.

[0061] Furthermore, the ratio between the length of the acceleration zone 310 and the length of the slowing zone 320 is x, where x ranges from 0.2 to 1. It can be understood that x can be any value within the range of 0.2 to 1, and can be specifically set according to the actual situation.

[0062] like Figure 1 and Figure 5 As shown, in some embodiments of the present invention, in order to further reduce the noise of gas in the second guide pipe 300, the slow flow zone 320 is set at the end of the acceleration zone 310 away from the first air outlet 122.

[0063] Specifically, the diameter of the slow-flow zone 320 gradually increases from the end closer to the acceleration zone 310 to the end farther away from the acceleration zone 310. It can be understood that when gas enters the slow-flow zone 320, the gas flow velocity gradually decreases, reducing the collision force between the gas and the inner wall of the slow-flow zone 320. Simultaneously, the friction between the gas and the inner wall of the slow-flow zone 320 decreases, thereby further reducing the noise generated during gas flow in the second guide pipe 300.

[0064] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, in order to facilitate the maintenance, cleaning or replacement of the fan 100, the housing 120 includes an upper housing 123 and a lower housing 124.

[0065] Specifically, the outer wall of the upper housing 123 is provided with a plurality of spaced-apart first limiting protrusions 123a, and the outer wall of the lower housing 124 is provided with a plurality of spaced-apart first connecting buckles 124a. The plurality of spaced-apart first limiting protrusions 123a are distributed in the circumference of the upper housing 123, and the plurality of spaced-apart first connecting buckles 124a are distributed in the circumference of the lower housing 124.

[0066] It should be noted that the number of first limiting protrusions 123a is equal to the number of first connecting buckles 124a, and each first connecting buckle 124a engages with one first limiting protrusion 123a to form the housing 120.

[0067] The number of first limiting protrusions 123a and the number of first connecting buckles 124a are each at least three, so as to improve the stability of the connection between the upper housing 123 and the lower housing 124.

[0068] The upper housing 123 and the lower housing 124 are fastened together to facilitate the installation or disassembly of the upper housing 123 and the lower housing 124, and also to facilitate the cleaning of the upper housing 123 and the lower housing 124.

[0069] In addition, to prevent air entering the housing 120 from leaking out from the connection between the upper housing 123 and the lower housing 124, a sealant is provided at the edge of the upper housing 123. This sealant connects the upper housing 123 and the lower housing 124 while improving the sealing quality of the housing edge.

[0070] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the first flow guide pipe 200 includes a first connecting shell 220 and a second connecting shell 230.

[0071] The first connecting shell 220 has a first mounting groove 221 on its edge, and the second connecting shell 230 has a first flange 231 on its edge. The first flange 231 engages with the first mounting groove 221 to form the first guide pipe 200. The engagement of the flange and the mounting groove improves the sealing quality of the connection between the first connecting shell 220 and the second connecting shell 230, so as to prevent gas in the first guide pipe 200 from leaking out from the edges of the first connecting shell 220 and the second connecting shell 230.

[0072] Meanwhile, the combination of the flange and the mounting groove can create a limiting position between the first connecting shell 220 and the second connecting shell 230, thereby improving the connection efficiency between the first connecting shell 220 and the second connecting shell 230.

[0073] In addition, a plurality of spaced-apart first connectors 222 are provided on the side wall of the first connecting shell 220, and the plurality of spaced-apart first connectors 222 are distributed in the circumference of the first connecting shell 220. A plurality of spaced-apart second connectors 232 are provided on the side wall of the second connecting shell 230, and the plurality of spaced-apart second connectors 232 are distributed in the circumference of the second connecting shell 230. Each first connector 222 is connected to one second connector 232.

[0074] It should be noted that the number of first connectors 222 is equal to the number of second connectors 232, and there are at least three of each. For example, when there are three first connectors 222 and three second connectors 232, the connecting lines between the three first connectors 222 form a triangular structure to improve the stability of the connection between the first connecting shell 220 and the second connecting shell 230.

[0075] Specifically, when the first connecting member 222 is a protrusion, the second connecting member 232 is a snap-fit, and the protrusion can engage with the snap-fit. Additionally, in this embodiment, the first connecting shell 220 and the second connecting shell 230 can also be connected by bolts.

[0076] The first connecting shell 220 and the second connecting shell 230 are connected to form the first flow guide pipe 200, so as to facilitate the installation or disassembly of the first flow guide pipe 200 and to facilitate the cleaning of the inner wall of the first flow guide pipe 200.

[0077] It should be noted that the inner walls of the first connecting shell 220 and the second connecting shell 230 are smooth curved surfaces to reduce the noise generated when gas collides with the inner walls of the first connecting shell 220 and the second connecting shell 230 when it enters the first guide pipe 200. Specifically, the curved surfaces of the first connecting shell 220 and the second connecting shell 230 extend towards the first air inlet, so that the extending direction of the curved surfaces of the first connecting shell 220 and the second connecting shell 230 is the same as the flow path of the gas in the first guide pipe 200, thereby further reducing the noise generated by the gas during the flow in the first guide pipe 200.

[0078] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, in order to improve the stability of the connection between the first connecting shell 220 and the second connecting shell 230, at least one limiting groove 223 is provided on the inner wall of the first connecting shell 220. Specifically, the limiting groove 223 is located on the side of the first connecting shell 220 near the air inlet of the first guide pipe 200.

[0079] Meanwhile, at least one limiting post 233 is provided on the inner wall of the second connecting shell 230, and the limiting post 233 is located on the side of the second connecting shell 230 near the air inlet of the first guide pipe 200.

[0080] The number of limiting grooves 223 is equal to the number of limiting posts 233, and one limiting post 233 is inserted into one limiting groove 223. By inserting the limiting post 233 into the limiting groove 223, a limiting is formed between the first connecting shell 220 and the second connecting shell 230, and the connection efficiency between the first connecting shell 220 and the second connecting shell 230 can be improved.

[0081] In this embodiment, the limiting groove 223 and the limiting post 233 are interference-fitted.

[0082] Additionally, it should be noted that when there are multiple limit posts 233 and multiple limit grooves 223, the multiple limit posts 233 are arranged alternately, and the multiple limit grooves 223 are arranged alternately.

[0083] In this embodiment, the number of limiting posts 233 and the number of limiting grooves 223 are each no more than four, so as to avoid affecting the process of gas entering the first guide pipe 200.

[0084] like Figure 2 , Figure 4 and Figure 5As shown, in some embodiments of the present invention, in order to improve the stability and sealing quality of the connection between the second guide pipe 300 and the fan 100, a sealing sleeve 400 is provided between the second guide pipe 300 and the first air outlet 122 of the fan 100.

[0085] like Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the second flow guide duct 300 includes a third connecting shell 330 and a fourth connecting shell 340.

[0086] The third connecting shell 330 has a first connecting platform 331 on its edge, and the fourth connecting shell 340 has a second connecting platform 341 on its edge. The first connecting platform 331 and the second connecting platform 341 are correspondingly connected to form the second flow guiding pipe 300. Specifically, the first connecting platform 331 and the second connecting platform 341 fit together and form a staggered connection to improve the connection efficiency between the first connecting platform 331 and the second connecting platform 341, and at the same time improve the sealing quality of the connection between the first connecting platform 331 and the second connecting platform 341.

[0087] In addition, the sidewall of the third connecting shell 330 is provided with a plurality of spaced third connecting members 332, which are distributed around the circumference of the third connecting shell 330. The sidewall of the fourth connecting shell 340 is provided with a plurality of spaced fourth connecting members 342, which are distributed around the circumference of the fourth connecting shell 340. Each third connecting member 332 corresponds to one fourth connecting member 342 for connection.

[0088] It should be noted that the number of third connectors 332 is equal to the number of fourth connectors 342, and there are at least three of each. For example, when there are three third connectors 332 and three fourth connectors 342, the connecting lines between the three third connectors 332 form a triangular structure to improve the stability of the connection between the third connecting shell 330 and the fourth connecting shell 340.

[0089] Specifically, when there are multiple third connectors 332, the lines connecting multiple adjacent third connectors 332 form a polygon, wherein the number of sides of the polygon is equal to the number of third connectors 332.

[0090] The second flow guide pipe 300 is formed by connecting the third connecting shell 330 and the fourth connecting shell 340, so as to facilitate the installation or disassembly of the second flow guide pipe 300 and to facilitate the cleaning of the inner wall of the second flow guide pipe 300.

[0091] In this embodiment, the inner walls of the third connecting shell 330 and the fourth connecting shell 340 are smooth curved surfaces to reduce the noise generated when gas enters the second guide pipe 300 and collides with the inner walls of the third connecting shell 330 and the fourth connecting shell 340.

[0092] Some embodiments of the present invention also provide a sweeping robot, which includes a sweeping robot body and the aforementioned air duct structure.

[0093] The first guide pipe 200 of the air duct structure is connected to the suction pipe in the robot vacuum cleaner, and the second guide pipe 300 is connected to the collection box in the robot vacuum cleaner, so that dust and impurities from the outside can be sucked into the collection box through the suction pipe and the air duct structure.

[0094] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0095] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0096] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A duct structure, characterized in that, Includes a fan, a first diversion pipe, and a second diversion pipe; The fan casing has a first air inlet and a first air outlet; The first guide pipe is connected to the first air inlet, and the second guide pipe is connected to the first air outlet; The diameter of the second air inlet of the first air guide pipe is larger than the diameter of the first air inlet; The second flow guide duct has an acceleration zone and a slow flow zone. The acceleration zone is located at the end of the second flow guide duct closer to the first air outlet, and the slow flow zone is located at the end of the second flow guide duct farther from the first air outlet. The diameter of the acceleration zone gradually decreases from the end closest to the first air outlet to the end furthest from the first air outlet; The diameter of the slow-flow zone gradually increases from the end closer to the acceleration zone to the end farther from the acceleration zone; The ratio between the length of the acceleration zone and the length of the slow flow zone is x, where the value of x is in the range of 0.2≤x≤1; The housing includes an upper housing and a lower housing; The outer wall of the upper housing is provided with a plurality of spaced first limiting protrusions, and the outer wall of the lower housing is provided with a plurality of spaced first connecting buckles. Each first connecting buckle engages with a first limiting protrusion to form the housing. The first flow guide pipe includes a first connecting shell and a second connecting shell; The first connecting shell has a first mounting groove on its edge, and the second connecting shell has a first flange on its edge. The first flange engages with the first mounting groove to form the first flow guide pipe. The sidewall of the first connecting shell is provided with a plurality of spaced-apart first connecting members, and the sidewall of the second connecting shell is provided with a plurality of spaced-apart second connecting members, each of the first connecting members being connected to one of the second connecting members.

2. The air duct structure according to claim 1, characterized in that, The inner wall of the first connecting shell is provided with at least one limiting groove, and the inner wall of the second connecting shell is provided with at least one limiting post. The number of the limiting grooves is equal to the number of the limiting posts, and one limiting post is inserted into one limiting groove.

3. The air duct structure according to any one of claims 1 to 2, characterized in that, A sealing sleeve is provided between the second guide pipe and the first air outlet of the casing.

4. The air duct structure according to any one of claims 1 to 2, characterized in that, The second flow guide pipe includes a third connecting shell and a fourth connecting shell; The edge of the third connecting shell is provided with a first connecting platform, and the edge of the fourth connecting shell is provided with a second connecting platform. The first connecting platform and the second connecting platform are connected to each other to form the second flow guide pipe. The sidewall of the third connecting shell is provided with a plurality of spaced-apart third connecting members, and the sidewall of the fourth connecting shell is provided with a plurality of spaced-apart fourth connecting members, each of the third connecting members corresponding to one of the fourth connecting members.

5. The air duct structure according to any one of claims 1 to 2, characterized in that, The inner walls of the acceleration zone and the slow-flow zone are both smooth curved surfaces.

6. The air duct structure according to any one of claims 1 to 2, characterized in that, The casing is a volute.

7. A robotic vacuum cleaner, characterized in that, It includes the body of a sweeping robot and the air duct structure as described in any one of claims 1 to 6.

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