Silencing assembly and sweeping robot

Abstract

The utility model relates to the technical field of household appliances, and discloses a noise reduction assembly and a sweeping robot, the noise reduction assembly comprises a shell, an air inlet, a first expansion cavity and an air outlet which are communicated in sequence are arranged in the shell, and the sectional area of the first expansion cavity is larger than that of the air inlet and that of the air outlet; one end of the inner insertion pipe is connected to the air inlet and / or the air outlet, the other end of the inner insertion pipe extends into the first expansion cavity, and the cross section area of the inner insertion pipe is smaller than that of the first expansion cavity. According to the silencing assembly, sound waves in a certain passing frequency range can be eliminated through the inner inserting pipe, so that the noise reduction effect of the silencing assembly is improved, and the user experience can be improved. Therefore, the noise reduction assembly can effectively reduce the noise of the air duct, the material cost of the noise reduction assembly is reduced, and the aerodynamic performance of the sweeping robot cannot be greatly lost.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a noise reduction component and a sweeping robot. Background Technology

[0002] The dust extraction duct of the sweeper is equipped with a fan. The fan drives the airflow to blow out from the air outlet. However, the airflow will generate noise due to sudden changes in speed and direction.

[0003] In related technologies, some noise reduction components include an expansion chamber located in the dust exhaust duct of the sweeper. The expansion chamber has an air inlet and an air outlet at both ends. The cross-sectional area of ​​the air inlet and the air outlet is smaller than that of the expansion chamber, which can reduce the noise generated by the airflow. However, the noise reduction effect of this noise reduction method is still insufficient, and the noise generated by the air duct still affects the user experience. Utility Model Content

[0004] In view of this, the present invention provides a noise reduction component and a robot vacuum cleaner to solve the problem that the noise reduction effect of noise reduction components in related technologies is poor and the noise generated by the air duct affects the user experience.

[0005] In a first aspect, this utility model provides a noise reduction component, comprising:

[0006] The housing has an air inlet, a first expansion cavity and an air outlet connected in sequence inside, and the cross-sectional area of ​​the first expansion cavity is larger than the cross-sectional area of ​​the air inlet and the air outlet.

[0007] An inner tube is connected at one end to an air inlet and / or an air outlet, and at the other end extends into the first expansion cavity. The cross-sectional area of ​​the inner tube is smaller than that of the first expansion cavity.

[0008] Beneficial effects: During use, the noise reduction component of this utility model flows into the first expansion cavity through the air inlet and then out through the air outlet. Since the cross-sectional area of ​​the first expansion cavity is larger than that of the air inlet and the air outlet, the sound waves can be continuously reflected and collided after entering the first expansion cavity, and finally converted into heat energy and dissipated. It has a good noise reduction effect in a wide range of sound wave frequencies.

[0009] Based on this, one end of the inner tube extends into the first expansion cavity. Sound waves entering the first expansion cavity can be reflected upon encountering different interfaces of the inner tube, resulting in a phase difference between the reflected sound waves and the original sound waves. Since sound waves with equal amplitude and opposite phases can interfere with each other and cancel each other out, the noise reduction component of this embodiment can eliminate sound waves within a certain frequency range through the inner tube, thereby improving the noise reduction effect of the noise reduction component and enhancing the user experience.

[0010] Therefore, the noise reduction component in this embodiment can effectively reduce the noise in the air duct, reduce the material cost of the noise reduction component, and will not cause significant damage to the pneumatic performance of the robot vacuum cleaner.

[0011] In one alternative implementation, the cannula includes:

[0012] The first inner tube is connected to the air inlet;

[0013] The second inner tube is connected to the air outlet, and the length of the first inner tube is greater than the length of the second inner tube.

[0014] Beneficial effects: With this configuration, the first and second inner tubes can respectively eliminate sound waves of different frequencies, thereby further improving the noise reduction effect of the noise reduction component.

[0015] In one alternative implementation, the depth of the first expansion cavity is l;

[0016] The length of the first internal cannula is l1, where l1 = l / 2; and / or,

[0017] The length of the second internal cannula is l2, where l2 = l / 4.

[0018] Beneficial effects: With this configuration, when an inner tube of l1 = l / 2 is inserted, the odd multiples of the passing frequency of 1 / 2 wavelength can be eliminated. When an inner tube of l2 = l / 4 is inserted, the even multiples of the passing frequency of 1 / 2 wavelength can be eliminated. When the first inner tube and the second inner tube are simultaneously installed in the first expansion cavity, theoretically all passing frequency noise can be covered.

[0019] In one alternative embodiment, the noise reduction assembly further includes a connecting tube connecting the first inner tube and the second inner tube, the connecting tube having a plurality of first through holes.

[0020] Beneficial effects: The sudden expansion and contraction of the channel cross-section in the first expansion chamber will bring a large drag loss to the aerodynamic equipment, especially when it is applied to the dust exhaust duct of a sweeper and the airflow speed is high, which will seriously affect its aerodynamic performance.

[0021] The silencing assembly of this application adds a connecting pipe between the first inner tube and the second inner tube, thereby connecting the first inner tube and the second inner tube. The shape of the connecting pipe is consistent with that of the first expansion cavity. For sound waves, since the connecting pipe has a first through hole, the first expansion cavity still maintains the acoustic impedance change caused by the abrupt change in cross-section. For aerodynamic performance, the connecting pipe can significantly reduce the aerodynamic pressure loss when flowing to the next cavity.

[0022] Therefore, the silencing component of this application embodiment can significantly reduce the pressure loss of the aerodynamic performance flowing to the next chamber while ensuring its silencing performance.

[0023] In one alternative implementation, the perforation rate of the connecting tube is greater than or equal to 30%.

[0024] Beneficial effect: When the perforation rate of the connecting tube is within the above range, the perforation rate of the connecting tube is large enough for sound waves, and the acoustic impedance change caused by the abrupt change in cross section is still maintained, thus avoiding the impact on the sound absorption performance of the first expansion cavity.

[0025] In one alternative implementation, the noise reduction assembly further includes:

[0026] The second expansion chamber is located inside the housing and has an air inlet and an air outlet. The air inlet of the second expansion chamber is connected to the air outlet, and the cross-sectional area of ​​the second expansion chamber is larger than the cross-sectional area of ​​the air outlet.

[0027] Beneficial effects: Since the cross-sectional area of ​​the second expansion cavity is larger than that of the air outlet, the sound waves can be continuously reflected and collided after entering the second expansion cavity, and finally converted into heat energy and dissipated, thereby further improving the noise reduction effect of the noise reduction component.

[0028] In one alternative implementation, the noise reduction assembly further includes:

[0029] The air outlet chamber is located inside the housing and has an air inlet and an air outlet. The air inlet of the air outlet chamber is connected to the air outlet of the second expansion chamber.

[0030] Beneficial effects: The exhaust chamber can further smooth and rectify the airflow discharged from the muffler assembly, thereby reducing the vortex noise at the outlet of the muffler assembly and further reducing the muffler assembly's muffler effect.

[0031] In one alternative implementation, the noise reduction assembly further includes:

[0032] A partition wall, separating the second expansion chamber and the outlet chamber, is provided with multiple second through holes; and / or,

[0033] One side wall of the air outlet chamber is the first mesh wall, and the air outlet end of the air outlet chamber is connected to the mesh of the first mesh wall.

[0034] Beneficial effects: The partition wall with multiple second through holes has a certain rectification effect. Because the vortex airflow generated by the suction of the fan rotation has a high velocity and the main trend of the flow direction is to be sent out along the tangential direction of the fan rotation, the flow field is relatively complex. Rectification by the partition wall can make the airflow direction conform to the current air supply trend of the flow channel and reduce the vortex inside the air channel.

[0035] In one alternative implementation, the noise reduction assembly further includes:

[0036] The air intake chamber is located inside the housing and has an air inlet end and an air outlet end. The air outlet end of the air intake chamber is connected to the air inlet.

[0037] In one optional embodiment, one side wall of the air intake chamber is a second mesh wall, and the air intake end of the air intake chamber is connected to the mesh of the second mesh wall.

[0038] Beneficial effects: The first mesh wall has a certain rectifying effect. Because the vortex airflow generated by the suction of the fan rotation has a high velocity and the main trend of the flow direction is to be sent out along the tangential direction of the fan rotation, the flow field is relatively complex. Rectifying the airflow through the first mesh wall can make the airflow direction conform to the current air supply trend of the flow channel and reduce the vortex inside the air channel.

[0039] In one optional embodiment, the first expansion chamber is located on one side of the air intake chamber, and the airflow direction in the first expansion chamber is set at an angle to the airflow direction in the air intake chamber. The first expansion chamber is in the shape of a bent tube and is connected between the air intake chamber and the first expansion chamber.

[0040] Beneficial effects: This design allows for a reasonable allocation of space within the silencing assembly, resulting in a simpler and more compact silencing structure. The bent tube structure can reduce the space required for the first expansion cavity while ensuring its length.

[0041] In one alternative implementation, the noise reduction assembly further includes:

[0042] The intake chamber is located inside the housing and is connected to the intake end of the air inlet chamber;

[0043] The fan, located inside the air intake chamber, delivers air towards the air intake end of the air intake chamber.

[0044] Beneficial effects: During the use of the silencer assembly, the fan can generate a strong suction force and draw the airflow into the intake chamber, then through the inlet chamber, the first expansion chamber and the second expansion chamber in sequence, and finally through the outlet chamber.

[0045] Secondly, this utility model also provides a robotic vacuum cleaner, comprising:

[0046] The main body contains a dust collection box.

[0047] The first aspect of this utility model is a noise reduction component, wherein the air inlet end of the noise reduction component is connected to the dust collection box.

[0048] Beneficial effects: The sweeper of this utility model includes or uses the noise reduction component of the first aspect of this utility model, and therefore has its beneficial effects, namely, it can eliminate sound waves within a certain frequency range through the inner tube, thereby improving the noise reduction effect of the noise reduction component and improving the user experience.

[0049] Therefore, the sweeping robot of this embodiment can effectively reduce air duct noise, reduce the material cost of the noise reduction components, and will not cause significant damage to the pneumatic performance of the sweeping robot. Attached Figure Description

[0050] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 This is an exploded view of a noise reduction component according to an embodiment of the present utility model;

[0052] Figure 2 for Figure 1 A cross-sectional view of the noise reduction assembly shown;

[0053] Figure 3 for Figure 1 The silencing component shown is a cross-sectional view from another angle;

[0054] Figure 4 This is a cross-sectional view of the first expansion cavity of a noise reduction assembly according to an embodiment of the present invention;

[0055] Figure 5 This is a cross-sectional view of the noise reduction component of this utility model embodiment from another angle;

[0056] Figure 6 for Figure 5 The sectional view of the silencing component shown conceals its fan to better illustrate the structure of the intake chamber;

[0057] Figure 7 The simulated sound loss curve of the noise reduction component in this embodiment of the utility model;

[0058] Figure 8 This is a simulation cloud diagram of the aerodynamic performance of the noise reduction component of this utility model without the connecting pipe.

[0059] Figure 9 This is a simulation cloud diagram of the aerodynamic performance of the noise reduction component after the connecting pipe is installed, which is an embodiment of this utility model.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Housing; 101. Air inlet; 102. First expansion chamber; 103. Air outlet; 104. Upper housing; 105. Lower housing;

[0062] 2. Internal cannula; 201. First internal cannula; 202. Second internal cannula;

[0063] 3. Connecting pipe; 301. First through hole;

[0064] 4. Air intake chamber; 401. Second mesh wall;

[0065] 5. Second expansion chamber;

[0066] 6. Air outlet chamber; 601. Partition wall; 602. Second through hole; 603. First mesh wall;

[0067] 7. Inhalation chamber;

[0068] 8. Fan. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0070] During the operation of the dust collection dock of the sweeping robot, the fan used in the dust exhaust duct has a large suction power, and there are high wind speeds and pressures at its air outlet. Furthermore, the airflow will generate noise due to sudden changes in speed and direction.

[0071] In related technologies, robotic vacuum cleaners generally reduce the noise generated by the air duct by setting sound-absorbing materials in the dust exhaust duct. However, in high suction mode, the noise generated by the air duct is still an important factor affecting the user experience.

[0072] In addition, among the related technologies, noise reduction for robotic vacuum cleaners is mostly achieved by diverting and reducing the pressure of the air duct, adding sound insulation cotton to the air outlet or side wall, etc. This not only requires a large layout space and uses a lot of sound insulation cotton, resulting in high material costs; in addition, the sound insulation cotton has a large air resistance pressure loss, which will also cause a significant reduction in dust removal performance, and it cannot reduce noise peaks for specific frequency bands.

[0073] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0074] According to an embodiment of the present invention, a noise reduction assembly is provided, including a housing 1 and an inner tube 2.

[0075] The housing 1 contains an air inlet 101, a first expansion cavity 102, and an air outlet 103 connected in sequence. The cross-sectional area of ​​the first expansion cavity 102 is larger than that of the air inlet 101 and the air outlet 103. One end of the inner tube 2 is connected to the air inlet 101 and / or the air outlet 103, and the other end extends into the first expansion cavity 102. The cross-sectional area of ​​the inner tube 2 is smaller than that of the first expansion cavity 102.

[0076] In use, the noise reduction component of this utility model flows into the first expansion cavity 102 through the air inlet 101 and then out through the air outlet 103. Since the cross-sectional area of ​​the first expansion cavity 102 is larger than that of the air inlet 101 and the air outlet 103, the sound waves can be continuously reflected and collided after entering the first expansion cavity 102, and finally converted into heat energy and dissipated. It has a good noise reduction effect in a wide range of sound wave frequencies.

[0077] Based on this, one end of the inner tube 2 extends into the first expansion cavity 102. Sound waves entering the first expansion cavity 102 can be reflected after encountering different interfaces of the inner tube 2, and the reflected sound waves differ from the original sound waves by a certain phase. Since sound waves with equal amplitude and opposite phases can interfere with each other and cancel each other out, the noise reduction component of this embodiment can eliminate sound waves within a certain frequency range through the inner tube 2, thereby improving the noise reduction effect of the noise reduction component and enhancing the user experience.

[0078] Therefore, the noise reduction component in this embodiment can effectively reduce the noise in the air duct, reduce the material cost of the noise reduction component, and will not cause significant damage to the pneumatic performance of the robot vacuum cleaner.

[0079] In one embodiment, the depth and cross-sectional area of ​​the first expansion cavity 102 are preferably designed according to the characteristics of the noise source, so that the noise reduction frequency of the expansion cavity is consistent with the peak frequency of the noise source, thereby achieving the effect of eliminating noise peaks and reducing the total noise value.

[0080] The following explains the parameter selection process for the first expansion cavity 102:

[0081] First, the expansion ratio of the first expansion cavity 102 is obtained based on the size of the product to be silenced that can accommodate the first expansion cavity 102 and the required noise reduction level.

[0082] The expansion ratio of the first expansion cavity 102 is obtained by the following formula:

[0083] ΔL=10lg[1+1 / 4(m-1 / m) 2 sin2 kl];

[0084] In the formula:

[0085] ΔL is the noise reduction of a single expansion cavity, in dm.

[0086] l is the depth of the first expansion cavity 102, in meters;

[0087] K is the wave number, with units of m. -1 ;

[0088] The wave number is obtained using the following formula:

[0089] k = 2πf / c;

[0090] In the formula, c is the speed of sound, in m / s;

[0091] f is the frequency, measured in Hz.

[0092] As an alternative implementation, the expansion ratio can also be obtained by looking up a table in a book. For example, in one embodiment, the noise reduction target of the product to be noise-reduced is 15dB, and the expansion ratio of a single expansion cavity is 12.

[0093] Next, the equivalent diameter of the first expansion cavity 102 is obtained based on the main frequency band of the noise of the product to be noise-reduced.

[0094] The lower limit noise reduction frequency and the lower limit noise reduction frequency of the expansion cavity can be obtained by the following formula:

[0095]

[0096] In the formula:

[0097] C is the speed of sound in air, measured in m / s;

[0098] D is the average equivalent diameter of the first expansion cavity 102, in meters;

[0099] S represents the cross-sectional area of ​​the air inlet 101 and air outlet 103 of the first expansion cavity 102, in m². 2 ;

[0100] V is the volume of the first expansion cavity 102, in meters. 3 ;

[0101] L is the depth of the first expansion cavity 102, in meters (m).

[0102] For example, in one embodiment, the main frequency range of the motor noise of the robot vacuum cleaner is 800-9000 Hz, so it can be known that the upper and lower cutoff frequency range of the required expansion cavity is approximately in the range of 800-10000 Hz.

[0103] Based on the internal dimensions of the robot vacuum cleaner, the equivalent diameter of the expansion cavity is selected as 45.6 mm, and the expansion ratio of the first expansion cavity 102 is 12. Therefore, the diameters of the air inlet 101 and the air outlet 103 are 14.86 mm.

[0104] To achieve a silencing frequency below 1000Hz, based on the product size and space, and using the following formula, the selected expansion cavity depth is 58.3mm. This can achieve silencing in the 700-9100Hz frequency range, which is close to the required silencing frequency range.

[0105] For example, such as Figure 3 As shown, the diameter of the inner cannula 2 is D1, the cross-sectional area is S1, and the equivalent diameter of the first expansion cavity is D2, the cross-sectional area is S2.

[0106] The expansion ratio of the first expansion cavity 102 is m, where m = S2 / S1.

[0107] In one alternative implementation, the endoscope includes a first endoscope and a second endoscope.

[0108] The first inner tube is connected to the air inlet, and the second inner tube is connected to the air outlet. The length of the first inner tube is greater than the length of the second inner tube.

[0109] With this configuration, the first and second inner tubes can respectively eliminate sound waves of different frequencies, thereby further improving the noise reduction effect of the noise reduction component.

[0110] In one embodiment, the depth of the first expansion cavity 102 is l;

[0111] The length of the first internal cannula 201 is l1, l1 = l / 2; and / or,

[0112] The length of the second internal cannula 202 is l2, l2 = l / 4.

[0113] With this configuration, when the inner tube 2 with l1 = l / 2 is inserted, the odd multiples of the passing frequency of 1 / 2 wavelength can be eliminated. When the inner tube 2 with l2 = l / 4 is inserted, the even multiples of the passing frequency of 1 / 2 wavelength can be eliminated. When the first inner tube 201 and the second inner tube 202 are simultaneously provided in the first expansion cavity 102, the noise of all passing frequencies can be theoretically covered.

[0114] The calculation of the expansion cavity depth may need to be determined based on various factors such as the specific acoustic design, application scenario, and required noise reduction effect, which is well known to those skilled in the art.

[0115] Exemplarily, in the embodiments of this application, such as Figure 2As shown in the figure, l represents the depth of the first expansion cavity 102 in this embodiment of the present invention. When the first expansion cavity 102 is a bent tube and is provided with a first inner tube 201 and a second inner tube 202, the depth of the expansion cavity is as shown in l in the figure, which is the sum of the length of the first inner tube 201, the length of the second inner tube 202, and the arc segment between the first inner tube 201 and the second inner tube 202.

[0116] In one embodiment, the noise reduction assembly further includes a connecting tube 3 connected between the first inner tube 201 and the second inner tube 202, and the connecting tube 3 is provided with a plurality of first through holes 301.

[0117] The sudden expansion and contraction of the first expansion cavity 102 due to the channel cross-section will bring a large drag loss to the aerodynamic equipment. Especially when it is applied to the dust exhaust duct of a sweeper, when the airflow speed is high, it will seriously affect its aerodynamic performance.

[0118] In this embodiment of the noise reduction assembly, a connecting pipe 3 is added between the first inner tube 201 and the second inner tube 202 to connect them. The shape of the connecting pipe 3 is consistent with that of the first expansion cavity 102. For sound waves, since the connecting pipe 3 has a first through hole 301, the first expansion cavity 102 still maintains the acoustic impedance change caused by the abrupt change in cross-section. For aerodynamic performance, the connecting pipe 3 can significantly reduce the aerodynamic pressure loss when flowing to the next cavity.

[0119] Therefore, the silencing component of this application embodiment can significantly reduce the pressure loss of the aerodynamic performance flowing to the next chamber while ensuring its silencing performance.

[0120] In one embodiment, the perforation rate of the connecting pipe 3 is greater than or equal to 30%.

[0121] When the perforation rate of the connecting pipe 3 is within the above range, the perforation rate of the connecting pipe 3 is large enough for sound waves, and the acoustic impedance change caused by the abrupt change in cross-section is still maintained, thus avoiding the impact on the sound absorption performance of the first expansion cavity 102.

[0122] Figure 8 This is a simulation contour plot showing the state where the first internal insertion tube 201 and the second internal insertion tube 202 are not connected by the connecting tube 3. Figure 9 The simulation cloud diagram shows the state in which the first inner tube 201 and the second inner tube 202 are connected by the connecting tube 3. The comparison shows that after the connecting tube 3 is set, the aerodynamic loss of the flow to the next cavity is greatly reduced.

[0123] In one embodiment, the silencing assembly further includes a second expansion cavity 5.

[0124] The second expansion cavity 5 is located inside the housing 1 and has an air inlet and an air outlet. The air inlet of the second expansion cavity 5 is connected to the air outlet 103, and the cross-sectional area of ​​the second expansion cavity 5 is larger than the cross-sectional area of ​​the air outlet 103.

[0125] Since the cross-sectional area of ​​the second expansion cavity 5 is larger than that of the air outlet 103, the sound waves can be continuously reflected and collided after entering the second expansion cavity 5, and eventually converted into heat energy and dissipated, thereby further improving the noise reduction effect of the noise reduction component.

[0126] Figure 7 In the diagram, the series coupling graph shows the simulated sound loss curve of the first expansion cavity 102 and the second expansion cavity 5 in series, as a function of the noise source frequency; the muffler graph shows the simulated sound loss curve of the first expansion cavity 102 as a function of the noise source. Figure 7 It is known that the sound wave transmission loss in the series connection state of the first expansion cavity 102 and the second expansion cavity 5 is higher than the transmission loss of the first expansion cavity 102. Therefore, the noise reduction component with the first expansion cavity 102 and the second expansion cavity 5 connected in series has a good noise reduction effect in the noise source frequency band of 0 to 9100 Hz, and the noise reduction effect is the best in the frequency bands of 1300 Hz and 6500 Hz.

[0127] The second expansion cavity 5 can be a cylindrical cavity or a curved tube, for example, as shown in the example. Figure 2 As shown, the depth of the second expansion cavity 5 is the axial span of the inlet and outlet of the second expansion cavity 5, i.e., l3.

[0128] In one embodiment, the silencing assembly further includes an exhaust chamber 6.

[0129] The air outlet chamber 6 is located inside the housing 1 and has an air inlet end and an air outlet end. The air inlet end of the air outlet chamber 6 is connected to the air outlet end of the second expansion chamber 5.

[0130] The exhaust chamber 6 can further smooth and rectify the airflow discharged from the muffler assembly, thereby reducing the vortex noise at the outlet of the muffler assembly and further reducing the muffler assembly's muffler effect.

[0131] As an alternative implementation, in an embodiment not shown in the accompanying drawings, the muffler assembly does not have an exhaust chamber 6, and the exhaust end of the second expansion chamber 5 directly exhausts air outward.

[0132] In one embodiment, the silencing assembly further includes a partition wall 601 and an air outlet chamber 6.

[0133] The partition wall 601 separates the second expansion cavity 5 and the air outlet cavity 6, and the partition wall 601 is provided with a plurality of second through holes 602.

[0134] The partition wall 601 with multiple second through holes 602 has a certain rectification effect. Because the vortex airflow generated by the suction of the fan 8 is relatively fast and the main trend of the flow direction is to be sent out along the tangential direction of the fan 8's rotation, the flow field is relatively complex. Rectification by the partition wall 601 can make the airflow direction conform to the current air supply trend of the flow channel and reduce the vortex inside the air channel.

[0135] One side wall of the air outlet chamber 6 is a first mesh wall 603, and the air outlet end of the air outlet chamber 6 is connected to the mesh of the first mesh wall 603.

[0136] The first mesh wall 603 has a certain rectification effect. Because the vortex airflow generated by the suction of the fan 8 is relatively fast and the main trend of the flow direction is to be sent out along the tangential direction of the fan 8's rotation, the flow field is relatively complex. Rectification by the first mesh wall 603 can make the airflow direction conform to the current air supply trend of the flow channel and reduce the vortex inside the air channel.

[0137] In one embodiment, the noise reduction assembly further includes an air intake chamber 4. The air intake chamber 4 is disposed within the housing 1 and has an air inlet end and an air outlet end, with the air outlet end of the air intake chamber 4 communicating with the air inlet 101.

[0138] In one embodiment, one side wall of the air intake chamber 4 is a second mesh wall 401, and the air intake end of the air intake chamber 4 is connected to the mesh of the second mesh wall 401.

[0139] The second mesh wall 401 has a certain rectification effect. Because the vortex airflow generated by the suction of the fan 8 is relatively fast and the main trend of the flow direction is to be sent out along the tangential direction of the fan 8's rotation, the flow field is relatively complex. Rectification by the second mesh wall 401 can make the airflow direction conform to the current air supply trend of the flow channel and reduce the vortex inside the air channel.

[0140] In one embodiment, the first expansion cavity 102 is located on one side of the air intake cavity 4, and the airflow direction in the first expansion cavity 102 is set at an angle to the airflow direction in the air intake cavity 4. The first expansion cavity 102 is a bent tube and is connected between the air intake cavity 4 and the first expansion cavity 102.

[0141] With this configuration, the space within the silencing assembly can be rationally allocated, making the silencing structure simpler and more compact. The bent tube structure can reduce the space required by the first expansion cavity 102 while ensuring the length of the first expansion cavity 102.

[0142] As an alternative implementation, the first expansion cavity 102 may also be a cylindrical cavity.

[0143] In one embodiment, the noise reduction assembly further includes an air intake chamber 9 and a fan 8.

[0144] The intake chamber 9 is located inside the housing 1 and is connected to the air inlet end of the intake chamber 4. The fan 8 is located inside the intake chamber 9 and can deliver air towards the air inlet end of the intake chamber 4.

[0145] During the use of the noise reduction assembly, the fan 8 can generate a strong suction force and draw the airflow into the intake chamber 7, then through the intake chamber 4, the first expansion chamber 102 and the second expansion chamber 5 in sequence, and finally through the exhaust chamber 6.

[0146] In one embodiment, the housing 1 includes an upper housing 104 and a lower housing 105 that can be interlocked. An air intake chamber 7 is formed between the upper housing 104 and the lower housing 105.

[0147] According to an embodiment of the present invention, another aspect is provided: a sweeping machine, including a main body and a noise reduction component.

[0148] The main body contains a dust collection box. The air intake of the silencer assembly is connected to the dust collection box.

[0149] The sweeper of this utility model includes or uses the noise reduction component of the first aspect of this utility model, and thus has the beneficial effect of eliminating sound waves within a certain frequency range through the inner tube 2, thereby improving the noise reduction effect of the noise reduction component and enhancing the user experience.

[0150] Therefore, the sweeping robot of this embodiment can effectively reduce air duct noise, reduce the material cost of the noise reduction components, and will not cause significant damage to the pneumatic performance of the sweeping robot.

[0151] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope of protection claimed in this application.

Claims

1. A noise reduction component, characterized in that, include: The housing (1) has an air inlet (101), a first expansion cavity (102) and an air outlet (103) connected in sequence inside. The cross-sectional area of ​​the first expansion cavity (102) is larger than the cross-sectional area of ​​the air inlet (101) and the air outlet (103). An inner tube (2) is connected at one end to the air inlet (101) and / or the air outlet (103), and at the other end extends into the first expansion cavity (102). The cross-sectional area of ​​the inner tube (2) is smaller than the cross-sectional area of ​​the first expansion cavity (102).

2. The noise reduction assembly according to claim 1, characterized in that, The internal cannula (2) includes: The first inner tube (201) is connected to the air inlet (101); The second inner tube (202) is connected to the air outlet (103), and the length of the first inner tube (201) is greater than the length of the second inner tube (202).

3. The noise reduction assembly according to claim 2, characterized in that, The depth of the first expansion cavity (102) is l; The length of the first internal cannula (201) is l1, l1 = l / 2; and / or, The length of the second inner cannula (202) is l2, l2 = l / 4.

4. The noise reduction assembly according to claim 2, characterized in that, It also includes a connecting tube (3) connecting the first inner tube (201) and the second inner tube (202), and the connecting tube (3) is provided with a plurality of first through holes (301).

5. The noise reduction assembly according to claim 4, characterized in that, The perforation rate of the connecting pipe (3) is greater than or equal to 30%.

6. The noise reduction assembly according to any one of claims 1 to 5, characterized in that, Also includes: The second expansion cavity (5) is located inside the housing (1) and has an air inlet and an air outlet. The air inlet of the second expansion cavity (5) is connected to the air outlet (103). The cross-sectional area of ​​the second expansion cavity (5) is larger than that of the air outlet (103).

7. The noise reduction assembly according to claim 6, characterized in that, Also includes: An air outlet chamber (6) is located inside the housing (1) and has an air inlet and an air outlet. The air inlet of the air outlet chamber (6) is connected to the air outlet of the second expansion chamber (5).

8. The noise reduction assembly according to claim 7, characterized in that, Also includes: A partition wall (601) separates the second expansion cavity (5) from the air outlet cavity (6), and the partition wall (601) is provided with a plurality of second through holes (602); and / or, One side wall of the air outlet chamber (6) is a first mesh wall (603), and the air outlet end of the air outlet chamber (6) is connected to the mesh of the first mesh wall (603).

9. The noise reduction assembly according to claim 6, characterized in that, Also includes: An air inlet chamber (4) is located inside the housing (1) and has an air inlet end and an air outlet end. The air outlet end of the air inlet chamber (4) is connected to the air inlet (101).

10. The noise reduction assembly according to claim 9, characterized in that, One side wall of the air intake chamber (4) is a second mesh wall (401), and the air intake end of the air intake chamber (4) is connected to the mesh of the second mesh wall (401).

11. The noise reduction assembly according to claim 9, characterized in that, The first expansion cavity (102) is located on one side of the air intake cavity (4). The airflow direction in the first expansion cavity (102) is set at an angle to the airflow direction in the air intake cavity (4). The first expansion cavity (102) is a bent tube and is connected between the air intake cavity (4) and the first expansion cavity (102).

12. The noise reduction assembly according to claim 9, characterized in that, Also includes: The intake chamber (9) is located inside the housing (1) and is connected to the intake end of the intake chamber (4); A fan (8) is located in the air intake chamber (9) and can deliver air toward the air intake end of the air intake chamber (4).

13. A robotic vacuum cleaner, characterized in that, include: The main body, which contains a dust collection box; The silencing assembly as described in any one of claims 1 to 12, wherein the air inlet end of the silencing assembly is connected to the dust collection box.

Images