Suction nozzle assembly and cleaning robot

Abstract

The present invention discloses a nozzle assembly, including a nozzle body, a shell provided on the nozzle body, an inclined side wall provided on the shell, the nozzle body and the shell forming a dust collection chamber, an air inlet provided on the bottom surface of the nozzle body, an air outlet provided on the shell, air flow enters from the air inlet, flows through the dust collection chamber, and is discharged from the air outlet, so that the air flow passing through the dust collection chamber is evenly distributed. Also disclosed is a cleaning robot, including the nozzle assembly as described above. The nozzle assembly provided by the present invention reduces the height of the air outlet from the ground, increases the average wind speed in the dust collection chamber, is conducive to the occurrence of vortex airflow, enhances the suction effect, thereby increasing the suction force and negative pressure level on the ground, strengthens the suction force below the air outlet, and manifests as an enhancement of the dust particle conveying capacity; enlarges the transition area from both sides to the nozzle body, makes the suction level more balanced, and reduces the leakage of dust particles caused by weak suction.

Description

Technical Field

[0001] The present invention belongs to the field of cleaning robots, and in particular relates to a suction nozzle assembly and a cleaning robot. Background Art

[0002] A cleaning robot is a household appliance that uses a fan to generate high negative pressure to absorb dust particles from the floor. The suction nozzle is the entrance to the machine's air duct and pneumatic system, where dust particles are collected and absorbed. To improve cleaning efficiency, the industry typically increases the fan speed or uses a larger fan to increase the air volume and pressure of the pneumatic system, but this also increases energy consumption and noise.

[0003] When the wind speed close to the ground in the nozzle cavity is greater than the suspension speed of the dust particles, the dust particles can be lifted, and the flow velocity below the suction pipe gradually decreases from top to bottom. The design of the traditional nozzle suction chamber increases the space below the suction pipe and the height of the suction pipe from the ground, making the average wind speed in the cavity lower, especially the wind speed near the ground is lower, which is manifested as the suction force of the suction pipe on the ground is weak; therefore, dust particles continue to accumulate under the suction pipe and have no time to be lifted, which is prone to leakage. The traditional nozzle has a large outlet area and the suction speed decays quickly, resulting in low suction force at the suction port. The vortex airflow is mainly concentrated in the cavity in the middle of the nozzle, with low suction on both sides. The overall suction force is unevenly distributed, which can easily lead to side leakage of dust particles caused by weak suction. Summary of the Invention

[0004] In order to solve the problem of uneven suction force of the cleaning robot's suction nozzle, which is prone to side leakage of dust particles and leads to low cleaning efficiency, the present invention provides a suction nozzle assembly and a cleaning robot. The invention solves the problem that the negative pressure distribution and airflow movement inside the suction nozzle in the prior art are not conducive to the suction and transportation of dust particles on the ground, and dust particles are prone to leakage in the middle of the suction nozzle. A suction nozzle assembly is proposed, which improves the negative pressure distribution and airflow movement trajectory inside the suction nozzle, strengthens the effect of the vortex airflow, and correspondingly improves the suction force of the pipe on the ground and the dust particle transportation capacity, shortens the absorption time, avoids dust particle leakage caused by weak suction, makes the suction level at each place more balanced, and improves the cleaning performance.

[0005] To achieve the above objectives, the specific technical solutions of the nozzle assembly and the cleaning robot of the present invention are as follows:

[0006] A suction nozzle assembly includes a suction nozzle body, a shell is provided on the suction nozzle body, an inclined side wall is provided on the shell, the suction nozzle body and the shell form a dust collection chamber, the bottom surface of the suction nozzle body is provided with an air inlet, and the shell is provided with an air outlet. The air flow enters from the air inlet, flows through the dust collection chamber, and is discharged from the air outlet, so that the air flow flowing through the dust collection chamber is evenly distributed.

[0007] Furthermore, a roller brush chamber is formed in the nozzle body, a roller brush body is provided in the roller brush chamber, an air flow channel is formed in the roller brush chamber, and the air flows from the air inlet through the air flow channel and then flows to the air outlet.

[0008] Furthermore, the bottom surface of the shell has an opening, which is connected to the suction nozzle body to form a dust suction chamber, and the air outlet is arranged on the top surface of the shell.

[0009] Furthermore, the vertical distance from the center of the air outlet to the bottom surface of the nozzle body is defined as H, the length of the bottom surface of the nozzle body is set as L, and 0.1≤H / L≤0.2.

[0010] Furthermore, the length of the air outlet is set to A, and the width of the air outlet is set to B, satisfying the relationship: 0.3≤A / L≤0.45, 0.08≤B / L≤0.12.

[0011] Furthermore, one end of the inclined side wall is connected to the air outlet, and the other end of the inclined side wall is fixedly connected to the bottom surface of the shell. A gap is set between the bottom end of the inclined side wall and the end of the bottom surface of the shell.

[0012] Furthermore, an angle is formed between the inclined side wall and the horizontal plane where the bottom surface of the bottom shell is located. The angle is set to α, 5°≤α≤20°.

[0013] Furthermore, inclined side walls are respectively provided at both ends of the air outlet in the longitudinal direction, the distance formed by the inclined side wall and one end of the bottom surface of the shell is set to L1, and the distance formed by the inclined side wall and the other end of the bottom surface of the shell is set to L2, 0.02≤L1 / L≤0.04, 0.02≤L2 / L≤0.040.

[0014] Furthermore, the air outlet is connected to an air duct, a dust box is arranged in the air duct, and a fan is arranged at one end of the dust box.

[0015] A cleaning robot comprises the suction nozzle assembly as described above.

[0016] The suction nozzle assembly of the present invention has the following advantages: the suction nozzle assembly provided by the present invention reduces the height of the air outlet from the ground, increases the average wind speed in the dust suction chamber, is conducive to the occurrence of vortex airflow, enhances the suction effect, thereby increasing the suction force and negative pressure level on the ground, and strengthens the suction force below the air outlet, which is manifested as an enhancement of the dust particle conveying capacity; the transition area from both sides to the suction nozzle body is enlarged, so that the suction level is more balanced, and the leakage of dust particles caused by weak suction is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a nozzle assembly in the prior art;

[0018] Figure 2 is a cross-sectional view of a nozzle assembly of the present invention;

[0019] Figure 3 A partial structural cross-sectional view of the nozzle assembly of the present invention;

[0020] Figure 4 It is a partial structural schematic diagram of the nozzle assembly of the present invention;

[0021] Figure 5 A side view of a portion of the structure of the nozzle assembly of the present invention;

[0022] Figure 6 Schematic diagram of the area where the static pressure inside the nozzle assembly is less than -250 Pa in the prior art;

[0023] Figure 7 Schematic diagram of the suction force distribution of the nozzle assembly at 0.5mm from the wall in the prior art;

[0024] Figure 8 Schematic diagram of the area where the static pressure inside the nozzle assembly of the present invention is less than -250 Pa;

[0025] Figure 9 Schematic diagram of the suction force distribution of the nozzle assembly of the present invention at 0.5 mm from the wall.

[0026] Description of the marks in the figure:

[0027] 1. Suction nozzle body; 11. Air outlet; 12. Dust suction chamber; 13. Air inlet; 14. Roller brush chamber; 15. Shell; 2. Roller brush body; 3. Dust box; 4. Air duct; 5. Fan; 6. Airflow channel. DETAILED DESCRIPTION

[0028] In order to better understand the purpose, structure and function of the present invention, a nozzle assembly and a cleaning robot of the present invention are further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the suction nozzle assembly in the prior art includes a suction nozzle body 1. The air outlet 11 of the suction nozzle body 1 is usually increased to the ground height and the dust suction chamber 12 is increased so that the average wind speed in the cavity is lower, especially the wind speed near the ground is lower, the suction force on the ground is weak, and dust particles continue to accumulate under the suction pipe and have no time to be lifted, which is prone to leakage.

[0030] like Figure 2 As shown, the present invention provides a nozzle assembly, including a nozzle body 1, a shell 15 is provided on the nozzle body 1, and an inclined side wall is provided on the shell 15. The nozzle body 1 and the shell 15 form a dust collection chamber 12, and an air inlet 13 is provided on the bottom surface of the nozzle body 1, and an air outlet 11 is provided on the shell 15. The air flow enters from the air inlet 13, flows through the dust collection chamber 12, and is discharged from the air outlet 11, so that the air flow flowing through the dust collection chamber 12 is evenly distributed.

[0031] like Figure 3 As shown, a roller brush chamber 14 is formed in the nozzle body 1 , a roller brush body 2 is arranged in the roller brush chamber 14 , an air flow channel 6 is formed in the roller brush chamber 14 , and the air flows from the air inlet 13 through the air flow channel 6 and then flows to the air outlet 11 .

[0032] The bottom surface of the shell 15 has an opening, which is connected to the nozzle body 1 to form a dust suction chamber 12. The air outlet 11 is set on the top surface of the shell 15, so that the roller brush rolls to suck in the air from the air inlet 13 to the air outlet 11.

[0033] The roller brush body 2 is connected to a driving motor, which is disposed in the nozzle body 1 , so that the driving motor drives the roller brush body 2 to rotate to achieve airflow.

[0034] In order to increase the average wind speed in the dust collection chamber 12, the vertical distance from the center of the air outlet 11 to the bottom surface of the suction nozzle body 1 is defined as H, the length of the bottom surface of the suction nozzle body 1 is set to L, and the ratio of H / L is set to 0.1≤H / L≤0.2. The height of the suction port is appropriately lowered, which can fully increase the average wind speed in the dust collection chamber 12, is conducive to the occurrence of vortex airflow, and enhances the suction effect, thereby increasing the suction force and negative pressure level on the ground, especially strengthening the suction force of the dust collection chamber 12, which is generally manifested as an enhancement of the dust particle transport capacity.

[0035] like Figure 4 As shown, in order to increase the suction force of the air outlet 11 of the shell 15 and avoid flow loss caused by a too small suction port surface and insufficient suction force caused by a too large suction port area, the length of the air outlet 11 is set to A, and the width of the air outlet 11 is set to B, satisfying the relationship: 0.3≤A / L≤0.45, 0.08≤B / L≤0.12.

[0036] One end of the inclined side wall is connected to the air outlet 11 , and the other end of the inclined side wall is fixedly connected to the bottom surface of the shell 15 . A gap is set between the bottom end of the inclined side wall and the end of the bottom surface of the shell 15 .

[0037] like Figure 5 As shown, an angle is formed between the inclined side wall and the horizontal plane where the bottom surface of the bottom shell is located, and the angle is set to α, 5°≤α≤20°.

[0038] Inclined side walls are respectively provided at both ends of the air outlet 11 in the longitudinal direction, and the distance formed by the inclined side wall and one end of the bottom surface of the shell 15 is set to L1, and the distance formed by the inclined side wall and the other end of the bottom surface of the shell 15 is set to L2, 0.02≤L1 / L≤0.04, 0.02≤L2 / L≤0.040, preferably L1=L2, thereby increasing the transition area from both sides to the air outlet 11, so that the suction distribution of the dust collection chamber 12 is more uniform.

[0039] like Figure 6 and Figure 7 As shown, a simulation diagram of the suction force distribution of the suction nozzle assembly in the prior art is shown, such as Figure 8 and Figure 9 As shown in the figure, a simulation diagram of the suction force distribution of the suction nozzle assembly in the present application is shown. From the simulation results, it can be seen that the area with negative pressure <-250Pa in the cavity of the traditional suction nozzle assembly is mainly concentrated near the suction port of the dust collection chamber 12 and in the upper end suction pipe. The negative pressure at the lower end of the dust collection chamber 12 and other areas is not high, resulting in the poor suction ability of the suction nozzle assembly to adsorb dust particles on the ground and around the suction nozzle. The suction nozzle assembly of the present application has a significantly expanded area with a negative pressure <-250Pa. The suction force at 0.5mm near the wall is increased from 120Pa to 160Pa, and extends to the ground and both sides of the suction port, increasing the pressure difference with the outside of the suction nozzle assembly. It can adsorb dust particles on the ground and the surrounding area with greater intensity, making the suction level more balanced and reducing dust leakage caused by weak suction.

[0040] Based on the above theoretical analysis, the present application also conducted the following experiments. Through the analysis and comparison of the following experimental data, it is fully demonstrated that the suction nozzle assembly of the present application can enhance the dust particle conveying capacity and make the suction force evenly distributed, thereby improving the dust collection efficiency. Table 1 shows the effect of height H on dust removal efficiency, as shown in the following table:

[0041] Table 1

[0042] plan H / L A / L B / L L1 / L L2 / L α Standard gray soy Comparative Example 0.3 0.4 0.1 0.03 0.03 15 88％ 94.3％ Preferred solution 0.15 0.4 0.1 0.03 0.03 15 95％ 98.6％

[0043] As shown in Table 1, when H / L is 0.3 in the comparative example and 0.15 in the preferred solution, the absorption rates of standard ash and soybeans are greater than those of the comparative example, which fully demonstrates that within the range of 0.1≤H / L≤0.2, appropriately lowering the suction port height can increase the average wind speed in the cavity, which is conducive to the occurrence of vortex airflow and enhances the suction effect, thereby increasing the suction force on the ground and the negative pressure level.

[0044] As shown in Table 2, Table 2 shows the influence of the air outlet length A and width B on the dust removal efficiency.

[0045] Table 2

[0046] plan H / L A / L B / L L1 / L L2 / L α Standard gray soy Comparative Example 0.15 0.5 0.14 0.03 0.03 15 87％ 93％ Preferred solution 0.15 0.4 0.1 0.03 0.03 15 95％ 98.6％

[0047] As shown in Table 2, A / L=0.5 and B / L=0.14 are selected as the comparative example to increase the suction force of the nozzle air outlet 11 while avoiding flow loss caused by a too small nozzle suction port surface and insufficient suction force caused by a too large suction port area.

[0048] As shown in Table 3, Table 3 shows the effects of L1 and L2 on dust removal efficiency.

[0049] Table 3

[0050]

[0051]

[0052] As shown in Table 3, L1=L2 is preferred. This increases the transition area from both sides to the nozzle. The area with a negative pressure <-250 Pa within the nozzle body 1 is significantly expanded, and the suction force at a distance of 0.5 mm from the wall increases from 120 Pa to 160 Pa. This extends toward the ground and both sides of the nozzle, significantly increasing the pressure difference with the outside world. This allows for greater suction of dust particles on the ground and surrounding areas. This results in a more balanced suction level and reduces dust leakage caused by weak suction.

[0053] As shown in Table 4, Table 4 shows the effect of angle α on dust removal efficiency.

[0054] Table 4

[0055] plan H / L A / L B / L L1 / L L2 / L α Standard gray soy Comparative Example 1 0.15 0.4 0.1 0.05 0.05 3 93％ 96.1％ Comparative Example 2 0.15 0.4 0.1 0.05 0.05 30 92％ 94.5 Preferred solution 0.15 0.4 0.1 0.03 0.03 15 95％ 98.6％

[0056] When the angle was 3° (as in Comparative Example 1), the adsorption rates of standard ash and soybeans were 93% and 96.1%, respectively. When the angle was 30° (as in Comparative Example 2), the adsorption rates of standard ash and soybeans were 92% and 94.5%, respectively. When the angle was 15° (the preferred embodiment), the adsorption rates of standard ash and soybeans were 95% and 98.6%, respectively. The above data clearly show that the adsorption rates of standard ash and soybeans were significantly improved when the angle was 15°.

[0057] The air outlet 11 is connected to an air duct 4 , a dust box 3 is provided in the air duct 4 , and a fan 5 is provided at one end of the dust box 3 , so that the fan 5 rotates to realize the circulation of air flow.

[0058] The present invention further provides a cleaning robot comprising the above-mentioned suction nozzle assembly, wherein a suction pipe is connected to one side of the dust box, thereby improving the cleaning efficiency of the cleaning robot.

[0059] It will be understood that the present invention is described through some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention.

[0060] Furthermore, these features and embodiments may be modified to suit specific circumstances and materials under the teachings of the present invention without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A nozzle assembly, characterized in that: The invention comprises a nozzle body (1), a shell (15) is provided on the nozzle body (1), an inclined side wall is provided on the shell (15), a dust collection chamber (12) is formed between the nozzle body (1) and the shell (15), an air inlet (13) is provided on the bottom surface of the nozzle body (1), an air outlet (11) is provided on the shell (15), an air flow enters from the air inlet (13) and flows through the dust collection chamber (12) and is discharged from the air outlet (11), so that the air flow flowing through the dust collection chamber (12) is evenly distributed; an angle is formed between the inclined side wall and the horizontal plane where the bottom surface of the bottom shell is located, The angle is set to α, 5°≤α≤20°; the inclined side walls are provided at both ends in the length direction of the air outlet (11), the distance formed by the inclined side wall and one end of the bottom surface of the shell (15) is set to L1, and the distance formed by the inclined side wall and the other end of the bottom surface of the shell (15) is set to L2, 0.02≤L1 / L≤0.04, 0.02≤L2 / L≤0.040; L1=L2, thereby increasing the transition area from both sides to the air outlet (11), making the suction force distribution of the dust collection chamber (12) more uniform; the length of the bottom surface of the nozzle body (1) is set to L.

2. The nozzle assembly according to claim 1, wherein: A roller brush chamber (14) is formed in the nozzle body (1), a roller brush body (2) is arranged in the roller brush chamber (14), an air flow channel (6) is formed in the roller brush chamber (14), and air flows from the air inlet (13) through the air flow channel (6) and then flows to the air outlet (11).

3. The nozzle assembly according to claim 1, wherein: The bottom surface of the shell (15) has an opening, which is connected to the suction nozzle body (1) to form a dust suction chamber (12), and the air outlet (11) is arranged on the top surface of the shell (15).

4. The nozzle assembly according to claim 1, wherein: The vertical distance between the center of the air outlet (11) and the bottom surface of the nozzle body (1) is defined as H, 0.1≤H / L≤0.

2.

5. The nozzle assembly according to claim 1, wherein: The length of the air outlet (11) is set to A, and the width of the air outlet (11) is set to B, satisfying the relationship: 0.3≤A / L≤0.45, 0.08≤B / L≤0.

12.

6. The nozzle assembly according to claim 1, wherein: One end of the inclined side wall is connected to the air outlet (11), and the other end of the inclined side wall is fixedly connected to the bottom surface of the shell (15). A distance is set between the bottom end of the inclined side wall and the end of the bottom surface of the shell (15).

7. The nozzle assembly according to claim 1, wherein: The air outlet (11) is connected to an air duct (4), a dust box (3) is provided in the air duct (4), and a fan (5) is provided at one end of the dust box (3).

8. A cleaning robot, characterized in that: The invention comprises a nozzle assembly according to any one of claims 1 to 7.

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