CN214906393U - Air duct assembly, dust collector main machine and dust collector - Google Patents

Abstract

The utility model discloses a wind channel subassembly, dust catcher host computer and dust catcher relates to cleaning device technical field for big technical problem of noise when solving current dust catcher and using. The air duct assembly comprises an air duct wall, and the air duct wall defines a spiral air outlet duct communicated with the negative pressure generating mechanism; a noise reducer is arranged in the air outlet duct, the noise reducer is provided with a resonant cavity communicated with the air outlet duct, and the resonant cavity is configured to attenuate single-frequency noise generated when the negative pressure generating mechanism works, so that the purpose of reducing the noise is achieved; and the air outlet duct is spiral to prolong the flowing distance of the air flow, so that the distance between the air outlet duct and the air outlet duct for reflecting and absorbing noise sound waves is prolonged, the noise energy is consumed, and the aim of reducing pneumatic noise is fulfilled. The air duct assembly of the present embodiment reduces noise in two ways. The utility model discloses a dust catcher host computer and dust catcher are provided with the wind channel subassembly for clean dust.

Description

Air duct assembly, dust collector main machine and dust collector

Technical Field

The utility model relates to a cleaning device field, concretely relates to wind channel subassembly, dust catcher host computer and dust catcher.

Background

With the continuous development of the industry of dust collectors, the requirements of people on the dust collectors are higher and higher, the requirements on experience in use are stricter and stricter, and particularly, noise generated in the working process of the dust collectors becomes one of the primary conditions for people to choose the dust collectors. In the related art, the exhaust duct of the dust collector mostly adopts a straight-through channel, and the outer side of the channel is coated with noise reduction cotton to achieve the purpose of noise reduction. However, although the noise reduction structure of the dust collector is simple, the noise reduction effect is poor, and the dust collector still generates large noise in the working process, so that the use of the dust collector is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a wind channel subassembly, dust catcher host computer and dust catcher, the big technical problem of noise when aiming at solving current dust catcher and using.

In order to achieve the above object, the utility model provides an air duct assembly, which comprises an air duct wall and a noise reducer, wherein the air duct wall defines a spiral air outlet duct communicated with a negative pressure generating mechanism; the noise reducer is installed in the air outlet duct, the noise reducer is provided with a resonant cavity communicated with the air outlet duct, and the resonant cavity is configured to attenuate single-frequency noise generated by the negative pressure generating mechanism during operation.

According to the air channel assembly provided by the embodiment of the utility model, the noise reducer is arranged in the air outlet channel and is provided with the resonant cavity communicated with the air outlet channel, the resonant cavity resonates with single-frequency noise generated by the negative pressure generating mechanism during working, so that the vibration of the resonant cavity is caused, and the vibration of the resonant cavity consumes noise energy, thereby achieving the purpose of reducing noise; and the air outlet duct is spiral to prolong the flowing distance of the air flow, so that the distance between the air outlet duct and the air outlet duct for reflecting and absorbing noise sound waves is prolonged, the noise energy is consumed, and the aim of reducing pneumatic noise is fulfilled. The air duct assembly of the embodiment reduces noise through two modes, and avoids the noise generated by the negative pressure generating mechanism from influencing the use of a user.

Optionally, the noise reducer includes a hollow cylinder disposed in the air outlet duct, and a resonance hole is disposed on a side wall of the hollow cylinder, and the resonance hole is used to communicate a cavity of the hollow cylinder with the air outlet duct, so that the cavity of the hollow cylinder forms the resonance cavity.

Optionally, at least one partition is disposed in the cavity of the hollow cylinder, the at least one partition divides the cavity of the hollow cylinder into a plurality of resonant cavities, and each resonant cavity corresponds to one resonant hole.

Optionally, one partition plate is arranged in the cavity of the hollow cylinder, and the partition plate is arranged along the length direction of the hollow cylinder.

Optionally, at least two of the plurality of resonant cavities are configured to attenuate noise in the same frequency band or noise in different frequency bands.

Optionally, at least two of the resonant cavities in the plurality of resonant cavities have the same or different volumes; the cross section areas of the resonant holes corresponding to at least two resonant cavities are the same or different.

Optionally, at least two of the resonant cavities in the plurality of resonant cavities have the same or different volumes.

Optionally, at least two of the resonant cavities have a circular resonant hole, the axial lengths of the circular resonant holes are the same or different, and the axial direction of the circular resonant hole is perpendicular to the cross section of the resonant hole.

Optionally, the outer wall of the hollow cylinder is connected with a helical blade, and the helical blade, the air duct wall and the hollow cylinder jointly define the spiral air outlet duct.

Optionally, at least two sections of the helical blade are disposed on the cavity wall of each resonant cavity, and the resonant hole corresponding to each resonant cavity is disposed between two adjacent sections of the helical blade.

Optionally, a sealant is disposed between the helical blade and the air duct wall.

Optionally, the air outlet duct is filled with sound attenuation cotton.

Optionally, at least two kinds of noise reduction cotton with different densities are filled in the air outlet duct.

The utility model also provides a dust catcher host computer, it includes that host computer shell, negative pressure take place the mechanism and as before the wind channel subassembly, the host computer shell is provided with air intake and air outlet, the negative pressure take place the mechanism with the wind channel subassembly sets up in the host computer shell, the inner wall of host computer shell constitutes the wind channel wall of wind channel subassembly, the wind channel wall inject the wind channel the both ends respectively with the air intake and the air outlet intercommunication of host computer shell, the negative pressure take place the mechanism and be used for the air drive to follow the air intake flow direction the air outlet.

The main machine shell of the dust collector of the utility model is provided with the air inlet and the air outlet, the negative pressure generating mechanism and the air channel component are arranged in the main machine shell, and the inner wall of the main machine shell forms the air channel wall of the air channel component, so that the noise reducer is directly arranged in the main machine shell, which is beneficial to simplifying the structure; and the resonant cavity of the noise reducer is configured to attenuate single-frequency noise generated when the negative pressure generating mechanism works, and the spiral air outlet duct can prolong the flowing distance of air flow so as to achieve the purpose of reducing pneumatic noise, thereby reducing the noise of the dust collector during use.

Optionally, the air outlet is provided with a filter, and a first mounting rack and a second mounting rack are further arranged in the host casing, the first mounting rack is used for mounting the negative pressure generating mechanism, and the second mounting rack is used for mounting the filter; the noise reducer of the air duct assembly is clamped between the negative pressure generating mechanism and the filter.

The utility model also provides a dust collector, it includes the dirt cup and as before the dust collector host computer, the dirt cup has dust absorption mouth and gas vent, the gas vent with the air intake intercommunication of dust collector host computer. The noise generated by a negative pressure generating mechanism in the main machine of the dust collector is attenuated through the resonant cavity, and the spiral air outlet duct can prolong the flowing distance of air flow and reduce the pneumatic noise; thereby reducing the noise of the dust collector and avoiding influencing the normal use of users.

The utility model discloses dust catcher among the technical scheme has the noise low, and user's use comfort is high advantage.

Drawings

Fig. 1 is a three-dimensional cross-sectional view of a main unit of a vacuum cleaner provided by an embodiment of the present invention;

fig. 2 is a sectional view of a main unit of a vacuum cleaner provided in an embodiment of the present invention;

fig. 3 is an exploded view of a main unit of a vacuum cleaner provided in an embodiment of the present invention;

fig. 4 is a schematic structural view of a noise reducer of a main unit of a vacuum cleaner according to an embodiment of the present invention;

fig. 5 is a front view of a noise reducer of a main unit of a vacuum cleaner according to an embodiment of the present invention;

fig. 6 is a sectional view taken along line a-a of fig. 5.

The reference numbers illustrate:

100: a main machine of the dust collector;

110: a host housing; 111: an air inlet; 112: an air outlet grille; 113: an air outlet duct; 114: a wire passing hole;

120: a noise reducer; 121: a hollow cylinder; 1211: a side wall; 1212: an end wall; 122: a resonant cavity; 123: a resonant aperture; 124: a partition plate; 125: a helical blade;

130: a negative pressure generating mechanism; 131: a seal ring; 132: a tapered channel;

140: a first mounting bracket; 141: a first annular side plate; 142: a base plate; 143: an opening;

150: a second mounting bracket; 151: a tail cover; 152: a filter; 153: a second annular side plate; 154: a top plate; 155: and an air outlet.

Detailed Description

The dust collector uses the suction force generated by the rotation of the motor to suck foreign matters mixed with air, such as dust, hair and the like, and the air containing the foreign matters is filtered in the dust collecting barrel and then is discharged out of the dust collector from the air outlet. Thus, the effects of removing dust and cleaning the ground are achieved.

The noise problem of the dust collector in the working process is troubling people all the time. The inventor finds that the noise sources of the dust collector are mainly two in the process of researching the noise of the dust collector, one is that air is sucked by suction force generated by the rotation of a motor of the dust collector, and sound waves are continuously generated by the compression, expansion, collision with the side wall of a channel and the like of the air in the process of fast flowing; the other is that the mechanical vibration of the negative pressure generating mechanism during operation is sound waves transmitted through air, and particularly, the negative pressure generating mechanism operates according to preset power to generate periodic vibration under a specific working mode of the dust collector, so that single-frequency noise can be continuously generated, and the noise is particularly harsh and can seriously affect the hearing and the use experience of a user.

In order to solve the technical problem, a motor cover is usually arranged outside the motor, and a silencing material is coated outside an air exhaust channel in the motor cover, but the arrangement mode not only causes the volume of the dust collector to be increased, but also has an unsatisfactory noise reduction effect.

With the progress of research, the inventors have developed a new noise reduction structure that can achieve the purpose of attenuating the single-frequency noise of the negative pressure generation mechanism. Particularly, the inventor sets up in the air-out wind channel that links to each other with negative pressure generation mechanism and falls the ware, should fall the ware including the cavity cylinder that is formed with the resonant cavity and this resonant cavity and air-out wind channel intercommunication, like this, when the single-frequency noise that negative pressure generation mechanism produced when the resonant cavity, this resonant cavity will take place to resonate to the energy of single-frequency noise is consumed through mechanical motion, has realized the decay to the single-frequency noise then, reaches the purpose of making an uproar of falling. The embodiment of the utility model provides a through set up the ware of making an uproar that falls that has the resonant cavity in the air-out wind channel, reduced the single-frequency noise that the negative pressure emergence mechanism produced.

Furthermore, the inventor also limits the noise reducer and the host casing to form a spiral air outlet duct together through the configuration of the appearance of the noise reducer so as to increase the flow distance of the air flow exhaust, and the spiral air outlet duct continuously reflects and absorbs noise sound waves so as to reduce the aerodynamic noise.

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Referring to fig. 1 to 3, wherein, fig. 1 is a three-dimensional cross-sectional view of a main vacuum cleaner provided in an embodiment of the present invention, fig. 2 is a cross-sectional view of a main vacuum cleaner provided in an embodiment of the present invention, and fig. 3 is an exploded view of a main vacuum cleaner provided in an embodiment of the present invention.

The embodiment of the utility model provides a dust collector, it includes dust catcher host computer 100 and dirt cup, and dust catcher host computer 100 provides power for the dirt gas is inhaled, and the dirt cup is used for carrying out the dirt gas separation.

Specifically, the dust cup is provided with a dust suction port and an exhaust port, the dust suction port is used for sucking dust and air in the environment, for example, the dust suction port is connected with the floor brush through a suction pipe, and a user can perform targeted cleaning on a target place (such as a sofa and the ground) in the environment by moving the floor brush, so that the dust and air can be sucked remotely, and the applicability and the use convenience of the dust collector are improved. The dust cup can separate dust and air in the dust air sucked by the dust suction opening, so that the dust enters the dust collecting groove, and the air enters the air inlet 111 of the cleaner main body 100 through the air outlet.

In the embodiment of the present invention, the specific structure of the dust cup for separating dust and gas is not limited, for example, a cyclone separation mechanism may be disposed in the dust cup for separating dust and gas; for another example, a centrifugal separation mechanism may be provided in the dust cup to separate the dust gas by centrifugal force.

As shown in fig. 1 to 3, the main vacuum cleaner 100 as a power structure for sucking dust and air includes a negative pressure generating mechanism 130, and the negative pressure generating mechanism 130 provides negative pressure to the dust cup, so that dust and air in the environment can enter the dust cup through the dust suction opening and can be separated in the dust cup. Illustratively, the negative pressure generating mechanism 130 comprises a motor and a wind wheel, and the motor is used for driving the wind wheel to rotate to generate negative pressure, so that the structure is simple and compact. Of course, the negative pressure generating mechanism 130 may be formed of other components, and for example, the negative pressure generating mechanism 130 may be formed of a vacuum pump or the like.

With continued reference to fig. 1 and 2, the cleaner main body 100 further includes a main body housing 110, which provides an installation space for the negative pressure generating mechanism 130. An air inlet 111 and an air outlet are respectively arranged at two ends of the host shell 110, and the air inlet 111 is communicated with an air outlet of the dust cup; the air outlet is provided with an air outlet grille 112, so that external foreign matters are prevented from entering the inside of the host shell 110 from the air outlet. The negative pressure generating mechanism 130 is used to drive the air to flow from the air inlet 111 to the air outlet.

The host shell 110 can be a cylindrical structure, and the air inlet 111 is arranged at the end part of one end of the cylindrical host shell 110 and is conveniently communicated with the exhaust port of the dust cup; the air outlet grille 112 is arranged on the side wall of the other end of the cylindrical main machine shell 110, on one hand, the air outlet grille 112 and the air inlet 111 are respectively arranged at two ends of the main machine shell 110, which is beneficial to prolonging the air flowing distance and reducing noise; on the other hand, the air outlet grille 112 is disposed on the sidewall of the cylindrical main housing 110, so as to facilitate increasing the air outlet area and facilitating the arrangement of the filter 152 to be described below. Illustratively, a plurality of arc openings that set up along axial interval are set up at the lateral wall of cylindrical host computer shell 110 other end, and a plurality of arc openings can form air-out grid 112, simple structure and convenient processing.

An air duct assembly is further installed in the host casing 110, and the air duct assembly of the embodiment of the present invention includes an air duct wall and a noise reducer 120, wherein the air duct wall defines a spiral air outlet duct 113 communicated with the negative pressure generating mechanism 130; the noise reducer 120 is installed in the air outlet duct 113.

It should be noted that the air duct wall may be a separately provided duct, a cylindrical structure, or the like, and the spiral air outlet duct 113 is defined by the air duct wall. Alternatively, as shown in fig. 1 and 2, the inner wall of the main body housing 110 may be used as an air duct wall or a part of the air duct wall, which is advantageous for simplifying the main body structure of the vacuum cleaner and reducing the weight of the main body of the vacuum cleaner.

Both ends of the air outlet duct 113 are communicated with the air inlet 111 and the air outlet of the main body case 110. The negative pressure generating mechanism 130 is located between the air outlet duct 113 and the air inlet 111, an inlet of the negative pressure generating mechanism 130 is communicated with the air inlet 111 of the host casing 110, an outlet of the negative pressure generating mechanism 130 is communicated with one end of the air outlet duct 113, and the other end of the air outlet duct 113 is communicated with the air outlet of the host casing 110.

Referring to fig. 2, when the vacuum cleaner is in operation, the negative pressure generating mechanism 130 operates to generate negative pressure, so that dust and air in the environment enter the dust cup through the dust suction opening, the dust and the air are separated in the dust cup, the separated dust is collected in the dust collecting groove, the separated air sequentially passes through the air outlet of the dust cup, the air inlet 111 of the host casing 110 and the inlet of the negative pressure generating mechanism 130, enters the negative pressure generating mechanism 130, and then sequentially passes through the outlet of the negative pressure generating mechanism 130, the air outlet duct 113 and the air outlet grille 112 to flow back to the environment.

The embodiment of the utility model provides a noise reducer 120 for reduce the single-frequency noise that dust catcher host computer 100 produced in the course of the work.

The structure and noise reduction principle of the noise reducer 120 according to the embodiment of the present invention will be described in detail with reference to fig. 4 to 6. Fig. 4 is a schematic structural view of a noise reducer of a main unit of a vacuum cleaner according to an embodiment of the present invention, fig. 5 is a front view of the noise reducer of the main unit of the vacuum cleaner according to an embodiment of the present invention, and fig. 6 is a cross-sectional view of a-a in fig. 5.

The noise reducer 120 of the present embodiment is provided with a resonant cavity 122 communicated with the air outlet duct 113, and the resonant cavity 122 is configured to attenuate a single frequency noise generated when the negative pressure generating mechanism 130 operates. One or more than one resonant cavity 122 may be provided, for example, two or three resonant cavities may be provided. The embodiment of the utility model provides a quantity and the mode of arranging to resonant cavity 122 do not restrict, and the technical personnel in the field can set up according to actual conditions such as falling the noise ware 120 installation space, falling the noise frequency. When a plurality of resonant cavities 122 are provided, the volumes of the plurality of resonant cavities 122 may be the same, so that the resonant cavities 122 may have the same natural frequency; alternatively, at least some of the resonant cavities 122 may have different volumes such that the resonant cavities 122 have different natural frequencies. Of course, the resonant cavities 122 having the same volume may have different natural frequencies in other ways, for example, the natural frequencies of the resonant cavities 122 having the same volume may be changed by changing the wall thickness of the resonant cavities or adding some other structure to the walls of the resonant cavities.

It should be explained here that the single-frequency noise refers to a continuous sound wave generated by the periodic vibration of the negative pressure generating mechanism 130 when operating at a certain fixed power, and is noise in a certain frequency band, for example, 950Hz to 1050Hz, and the peak of the noise spectrum in the frequency band appears at 1000 Hz. When the fixed frequency of the resonant cavity 122 is also 1000Hz, the single frequency noise with a peak at 1000Hz generated by the negative pressure generating mechanism 130 resonates with the resonant cavity 122, so that the resonant cavity 122 generates mechanical vibration to attenuate the single frequency noise. Since the resonant cavity is vibrating at and near 1000Hz at the maximum speed, the frequency band consumes the most sound energy and the most noise is attenuated.

In some implementations, the noise reducer 120 includes a hollow cylinder 121 disposed in the outlet duct 113, and a resonant hole 123 is disposed on a sidewall 1211 of the hollow cylinder 121, and the resonant hole 123 is used to communicate a cavity of the hollow cylinder 121 with the outlet duct 113, so that the cavity of the hollow cylinder 121 forms the resonant cavity 122.

The hollow cylinder 121 may be prismatic, cylindrical, elliptic cylindrical, or the like, and optionally, the hollow cylinder 121 has a cylindrical cavity, which facilitates processing and installation, and facilitates installation of the following helical blade 125. For example, referring to fig. 6, the hollow cylinder 121 includes a circular sidewall 1211 and end walls 1212 disposed at both ends of the sidewall 1211, wherein the sidewall 1211 and the end walls 1212 form a cavity, which is advantageous for reducing the weight of the noise reducer 120 and for reducing the weight of the vacuum cleaner.

The resonance hole 123 may be a circular hole, a rectangular hole, an elliptical hole, or the like, and the shape of the resonance hole 123 is not limited herein. Optionally, the resonant hole 123 is a circular hole, which facilitates processing and calculation of the natural frequency of the resonant cavity 122.

The hollow cylinder 121 may be provided with a resonant cavity 122, that is, the cavity of the central control cylindrical member 121 is the resonant cavity 122, and the resonant hole 123 is disposed on the sidewall 1211, so that the resonant cavity 122 has a simple structure and can reduce the noise of a predetermined single frequency band. Moreover, the volume of the resonant cavity 122 is larger, and the resonant cavity can play a role in buffering air flow, so that the impact of the air flow is reduced, and the pneumatic noise is reduced.

A plurality of resonant cavities 122, e.g., two, three, etc., may also be disposed on the hollow cylinder 121. The embodiment of the utility model provides a quantity to resonant cavity 122 and the mode of arranging on cavity cylinder 121 do not restrict, and the technical personnel in the field can set up according to actual conditions such as cavity cylinder 121 installation space, the frequency of making an uproar falls.

In some specific examples, at least one partition 124 is disposed in the cavity of the hollow cylinder 121, and the at least one partition 124 divides the cavity of the hollow cylinder 121 into a plurality of resonant cavities 122.

Taking the cavity of the hollow cylinder 121 as a cylinder, the partition 124 may be disposed parallel to the end wall 1212, such that the partition 124 divides the cavity of the hollow cylinder 121 into at least two cylindrical resonant cavities 122; alternatively, in conjunction with fig. 6, partition 124 may be disposed perpendicular to end wall 1212, e.g., partition 124 may be perpendicular to end wall 1212, dividing the cavity of hollow cylinder 121 into two semi-cylindrical resonant cavities 122. Of course, the partition 124 may be disposed in other directions, for example, two ends of the partition 124 are respectively connected to two end walls 1212, and the angle between the partition 124 and the end wall 1212 is less than 90 °.

The embodiment of the utility model provides a do not do the injecing to the installation direction of baffle 124 in cavity 121 cavity, promptly, the embodiment of the utility model provides a do not do the injecing to the shape in resonance chamber 122. Those skilled in the art can set the configuration according to practical situations such as convenience of processing, difficulty of calculating the volume of the resonant cavity 122, and the like.

A partition 124 is disposed in the cavity of the hollow cylinder 121, and the partition 124 is disposed along the length direction of the hollow cylinder 121, such that each resonant cavity 122 corresponds to a portion of the sidewall 1211, thereby facilitating the disposition of the resonant hole 123. Illustratively, the partition 124 is perpendicular to the end wall 1212 and the partition 124 extends in a radial direction of the end wall 1212, so that the partition 124 divides the cavity of the hollow cylinder 121 into at least two fan-shaped resonant cavities 122, which is convenient to manufacture, and the resonant cavities 122 are regular in shape, which is convenient to calculate the volume to determine the natural frequency of the resonant cavities 122.

In this embodiment, one partition 124 may be provided to divide the cavity of the hollow cylinder 121 into two resonant cavities 122; the partition 124 may be provided in plural to increase the number of the resonant cavities 122.

In the present embodiment, the partition 124 is disposed in the cavity of the hollow cylinder 121 to form at least two resonant cavities 122, so that not only the number of the resonant cavities 122 can be increased, but also the structural strength of the hollow cylinder 121 can be increased by the partition 124.

In the present embodiment, the resonant cavity 122 is disposed on the noise reducer 120, and the natural frequency of the resonant cavity 122 is the same as the frequency of the single-frequency noise continuously generated when the negative pressure generating mechanism 130 operates, so that the resonant cavity 122 resonates to consume noise energy, thereby reducing or even eliminating the single-frequency noise.

In some embodiments, at least two resonant cavities 122 are configured to attenuate same band noise. That is, at least two resonant cavities 122 have the same natural frequency, so that the resonant cavities 122 having the same natural frequency can resonate with the noise sound wave of the same frequency band, thereby improving the noise reduction effect of the noise of the frequency band.

Generally, the vacuum cleaner is provided with different working modes, for example, when cleaning dirty floor, a high-power mode of the negative pressure generating mechanism 130 is turned on to improve the dust suction capability; when the sofa is cleaned, the low power mode of the negative pressure generating mechanism 130 is turned on. In different working modes of the vacuum cleaner, the working frequency of the negative pressure generating mechanism 130 may be different, and thus the frequency band of the single-frequency noise generated by the negative pressure generating mechanism 130 is also different. Correspondingly, in some embodiments, at least two resonators 122 are configured to attenuate noise in different frequency bands. That is, at least two resonant cavities 122 have different natural frequencies, so that the resonant cavities 122 with different natural frequencies can resonate with noise sound waves of different frequency bands respectively to reduce the noise of different frequency bands, so that the noise generated by dust absorption in any working mode can be reduced.

It can be understood that the noise of different frequency bands is single-frequency noise with different noise spectrum peaks; that is, the peak frequencies of the two single-frequency noises are different, i.e., the noises in different frequency bands are obtained. For example, the noise of 950Hz to 1050Hz and the peak of the noise spectrum of the frequency band occur at 1000Hz, the noise of 1950Hz to 2050Hz and the peak of the noise spectrum of the frequency band occur at 2000Hz, which is the noise of different frequency bands.

Here, it should be noted that the factors affecting the natural frequency of the resonant cavity 122 include the volume of the resonant cavity 122, the cross-sectional area of the resonant hole 123, the axial length of the resonant hole 123, and the like, and the noise reduction effect can be achieved by adjusting any one or more of them. Referring to fig. 5 and 6, taking the example that the resonance hole 123 is a circular hole provided on the side wall 1211, the cross-sectional area of the resonance hole 123 is the area of a circular cross-section, and the axial direction of the resonance hole 123 is perpendicular to the cross-section of the resonance hole 123, i.e., the axial direction of the resonance hole 123 coincides with the radial direction of the circular cavity.

At least two of the cavities 122 may be of the same or different volumes. For example, referring to FIG. 6, the volumes of the two resonant cavities 122 are the same; alternatively, among the plurality of resonant cavities 122, two resonant cavities 122 have different volumes. Therefore, the natural frequency of the resonant cavity 122 is changed by changing the volume of the resonant cavity 122, and then the frequency band noise which can be attenuated by the resonant cavity is changed, so that the application flexibility of the air duct assembly is improved.

Optionally, the cross-sectional areas of the resonant holes 123 corresponding to at least two resonant cavities 122 are the same or different. Referring to fig. 5, at least two resonant cavities 122 have circular resonant holes 123, and the diameters of the circular resonant holes 123 are the same or different. Since the resonance hole 123 is provided on the sidewall 1211 of the hollow cylinder 121, the process is facilitated, and the natural frequency of the resonance cavity 122 is changed by changing the cross-sectional area of the resonance hole 123, which is simple and convenient, and improves the process convenience.

Optionally, the axial lengths of the resonant holes 123 corresponding to at least two resonant cavities 122 are the same or different. The natural frequency of the resonant cavity 122 is changed by changing the axial length of the resonant hole 123, and the processing is simple and convenient. It should be noted here that the axial length of the resonance hole 123 is the same as the wall thickness of the side wall 1211, but is not limited thereto, for example, a protruding ring is provided on the outer surface of the side wall 1211, and the protruding ring is coaxial with the resonance hole 123 to extend the axial length of the resonance hole 123.

Thus, a person skilled in the art can set the volume of the resonant cavity 122, the cross-sectional area of the resonant hole 123 and the axial length of the resonant hole 123 according to the actual conditions of the vacuum cleaner, the working state of the negative pressure generating mechanism 130, etc. to determine the natural frequency of the resonant cavity 122 and improve the flexibility of the structural configuration of the noise reducer 120.

The embodiment of the utility model provides an except that the resonant cavity 122 that utilizes the noise reducer 120 of making an uproar falls makes an uproar, the utility model discloses the air-out wind channel 113 of embodiment can also be constructed into spiral air-out wind channel to the flow distance of extension air current makes the distance of air-out wind channel reflection and absorption noise sound wave grow, thereby consumes the noise energy, reaches the purpose that reduces pneumatic noise.

Various manners of forming the spiral air outlet duct 113 may be adopted, for example, the duct wall is a spiral baffle; for another example, the inner wall of the main body case 110 is provided with a spiral baffle to define a spiral air outlet duct 113 between the inner wall of the main body case 110 and the hollow cylinder 121. For example, with continued reference to fig. 4 to 6, a helical blade 125 is connected to the outer wall of the hollow cylinder 121, and the helical blade 125 and the air duct wall jointly define the spiral air outlet duct 113. In a specific example, referring to fig. 1 and 2, the helical blade 125 and the inner wall of the main casing 110 together define the spiral air outlet duct 113. At this time, the hollow cylinder 121 and the spiral blade 125 form an independent installation structure, which facilitates installation and processing.

The rotation direction of the helical blade 125 may be left-handed or right-handed. The leading angle of the spiral blade 125 and the number of turns of the spiral blade 125 may be set by those skilled in the art according to the actual circumstances such as the installation space. Illustratively, the hollow cylinder 121 is a cylinder, and the helical blade 125 is provided with two turns, so as to avoid that the noise reduction effect is not significant due to too few turns of the helical blade 125.

In this embodiment, the helical blade 125 is disposed on the outer wall of the hollow cylinder 121 of the noise reducer 120, the helical blade 125 and the inner wall of the main housing 110 jointly define the spiral air outlet duct 113, at this time, the air discharged from the outlet of the negative pressure generating mechanism 130 is discharged to the environment through the spiral air outlet duct 113 and the air outlet grille 112, wherein the spiral air outlet duct 113 extends the flowing distance of the air flow, the aerodynamic noise is continuously reflected and absorbed in the spiral air outlet duct 113, and the noise energy is consumed, thereby achieving the purpose of reducing the aerodynamic noise.

When the spiral blade 125 is provided on the outer wall of the hollow cylinder 121, in order to provide an arrangement space for the resonance hole 123, the resonance hole 123 corresponding to each resonance cavity 122 is provided between two adjacent sections of the spiral blade 125, that is, the resonance hole 123 is provided between two turns of the spiral blade 125. Of course, at this time, at least two sections of the helical blade 125 are disposed on the wall of each resonant cavity 122, wherein the wall of the resonant cavity 122 is the sidewall 1211 of the hollow cylinder 121. As shown in fig. 5 and 6, the partition 124 is disposed along the length direction of the hollow cylinder 121, and the helical blade 125 extends helically around the length direction of the hollow cylinder 121, so that each resonant cavity 122 includes at least two segments of the helical blade 125, thereby improving the convenience of processing the resonant hole 123.

Optionally, a sealant is disposed between the helical blade 125 and the air duct wall. When the inner wall of the main engine shell 110 forms an air duct wall, a sealant is arranged between the helical blade 125 and the inner wall of the main engine shell 110, so that on one hand, the mounting stability of the noise reducer 120 can be improved, on the other hand, the tightness between two adjacent helical channels can be improved, and the influence on the exhaust effect caused by the turbulence of air flow due to the existence of gaps is avoided.

The utility model discloses in some optional examples, air outlet duct 113 intussuseption is filled with the amortization cotton, improves noise reduction. Optionally, at least two kinds of noise reducing cotton with different densities are filled in the air outlet duct 113, so that the noise reduction effect is further enhanced. Wherein, the noise reduction cotton can be synthesized by single fiber, such as polyester fiber, glass fiber, etc.; the silencing cotton can also be formed by processing various fibers; the embodiment of the utility model provides a do not restrict to the cotton concrete material of sound.

In order to further filter the air discharged to the environment, the main body of the cleaner is further provided with a filter 152 at the air outlet. With continued reference to fig. 1 and 2, an installation opening is provided at one end of the main housing 110, where the air outlet grille 112 is provided, and the installation opening can facilitate installation of components such as the negative pressure generating mechanism 130 and the like in the main housing 110; a second mounting bracket 150 may be mounted within the host housing 110, the second mounting bracket 150 closing the mounting opening and mounting a filter 152.

Referring to fig. 2 and 3, the second mounting bracket 150 may include a tail cap 151 and a top plate 154 that are disposed at an opposite interval, the tail cap 151 abuts an end portion of the host housing 110, the top plate 154 is located inside the host housing 110, and the top plate 154 is connected to the host housing 110. A second annular side plate 153 is provided between the tail cover 151 and the top plate 154. The second annular side plate 153 is opposite to the air outlet grille 112, and a space is provided between the second annular side plate 153 and the inner wall of the main unit housing 110. As such, the second annular side plate 153, the tail cap 151, the top plate 154, and the outlet grill 112 define an annular chamber to mount the filter 152.

The top plate 154 is provided with an air outlet 155, and the second annular side plate 153 is also provided with an air outlet. Thus, the air flow in the air outlet duct 113 enters the second annular side plate 153 through the air outlet 155 on the top plate 154; and then the air outlet annular chamber arranged on the second annular side plate 153 is filtered by the filter 152, and then is discharged to the environment through the air outlet grille 112, so that the air flow is further filtered, and the dust collection effect is improved.

In some embodiments, the filter 152 may be selected from the group consisting of HEPA, a HEPA, HEPA.

Of course, the filter 152 of the present invention is not limited to the filter of the hepa, and may be other filter.

In this embodiment, the negative pressure generating mechanism 130 is installed inside the main housing 110, and the negative pressure generating mechanism 130 has an inlet and an outlet, the inlet of the negative pressure generating mechanism 130 is communicated with the air inlet 111, and the outlet of the negative pressure generating mechanism 130 is communicated with the air outlet duct 113.

Illustratively, as shown in fig. 2 and 3, the negative pressure generating mechanism 130 is secured within the host housing 110 by a first mounting bracket 140. The first mounting bracket 140 may include a first annular side plate 141 and a bottom plate 142 disposed at an end of the first annular side plate 141, the bottom plate 142 fixes the negative pressure generating mechanism 130 through a screw, and the bottom plate 142 is provided with an opening 143, which is an outlet of the negative pressure generating mechanism 130 and is communicated with the air outlet duct 113. The first annular side plate 141 is attached to the inner wall of the main body case 110. The space formed by the first annular side plate 141 and the bottom plate 142 accommodates at least part of the negative pressure generating mechanism 130, so that the vibration of the negative pressure generating mechanism 130 can be buffered, the effect of absorbing noise and sound waves can be achieved, and the use comfort of the dust collector is improved.

In addition, a sealing ring 131 is arranged between the first mounting bracket 140 and the air inlet 111, the sealing ring 131 is positioned between the negative pressure generating mechanism 130 and the main unit housing 110, and the sealing ring 131 can seal the negative pressure generating mechanism 130 and also has the effect of vibration reduction. One end of the sealing ring 131 is connected with the first annular side plate 141, so that the negative pressure generating mechanism 130 is wrapped between the sealing ring 131 and the first mounting bracket 140, and the arrangement is favorable for protecting the negative pressure generating mechanism 130 and can also reduce vibration and noise of the negative pressure generating mechanism 130. The other end of the sealing ring 131 is provided with a through opening, a tapered channel 132 is arranged in the through opening, and the tapered channel 132 is communicated with the inlet of the negative pressure generating mechanism 130 and the air inlet 111, so that the air flow of the air inlet 111 enters the negative pressure generating mechanism 130 through the tapered channel 132.

The negative pressure generating mechanism 130 is arranged in a space formed by the sealing ring 131 and the first mounting bracket 140, so that the negative pressure generating mechanism 130 is protected, vibration is buffered, noise is reduced, and air flow is guided to enter the air outlet duct 113 from the air inlet 111 through the negative pressure generating mechanism 130, thereby improving air outlet speed and cleaning efficiency of the dust collector.

With the above arrangement, referring to fig. 2, the negative pressure generating mechanism 130 works to generate negative pressure, so that dust and air in the environment enter the dust cup through the dust suction opening, and are separated in the dust cup, the separated dust is collected in the dust collecting tank, the separated gas sequentially passes through the air outlet of the dust cup, the air inlet 111 and the inlet of the negative pressure generating mechanism 130, enters the negative pressure generating mechanism 130, and then sequentially passes through the outlet of the negative pressure generating mechanism 130, the air outlet duct 113 and the air outlet grille 112 to flow back to the environment.

In order to supply power to the negative pressure generating mechanism 130, the negative pressure generating mechanism 130 is connected with a power supply through a cable; and the negative pressure generating mechanism 130 is connected with the control structure of the cleaner through a cable to control the working state thereof. To this end, referring to fig. 1, a wire passing hole 114 is formed in a side wall of the main body case 110 to pass through a power cable, a signal cable, and the like of the negative pressure generating mechanism 130.

In the embodiment of the present invention, the noise reducer 120 is installed in the air outlet duct 113 in various ways, for example, the noise reducer 120 may be connected to the inner wall of the host casing 110 in a clamping manner, in a screw manner, or the like. Optionally, the noise reducer 120 is clamped between the negative pressure generating mechanism 130 and the filter 152, for example, referring to fig. 2 and 3, the noise reducer 120 is clamped between the top plate 154 of the second mounting bracket 150 and the bottom plate 142 of the first mounting bracket 140, and no additional fixing structure is required to fix the noise reducer 120, which not only facilitates the installation of the noise reducer 120, but also facilitates the simplification of the structure of the noise reducer 120.

Finally, although the noise reducer structure with resonant cavities in the air outlet duct has been described in detail mainly by taking a vacuum cleaner as an example, it should be understood that the air duct assembly can also be applied to other devices with negative pressure generating mechanisms, such as an air conditioner, a fresh air machine or a purifier.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims (16)

1. An air duct assembly, comprising:

the air duct wall defines a spiral air outlet duct communicated with the negative pressure generating mechanism;

the noise reducer is installed in the air outlet duct, the noise reducer is provided with a resonant cavity communicated with the air outlet duct, and the resonant cavity is configured to attenuate single-frequency noise generated by the negative pressure generating mechanism during operation.

2. The air duct assembly according to claim 1, wherein the noise reducer comprises a hollow cylinder disposed in the air outlet duct, and a resonant hole is disposed on a side wall of the hollow cylinder, and the resonant hole is used for communicating a cavity of the hollow cylinder with the air outlet duct, so that the cavity of the hollow cylinder forms the resonant cavity.

3. The air duct assembly of claim 2, wherein at least one partition is disposed within the hollow cylindrical body, the at least one partition dividing the hollow cylindrical body into a plurality of resonant cavities, each resonant cavity corresponding to one resonant hole.

4. The air duct assembly of claim 3, wherein the partition is disposed within the hollow of the hollow cylinder and is disposed along a length of the hollow cylinder.

5. The air duct assembly of claim 3, wherein at least two of the plurality of resonant cavities are configured to attenuate noise in the same frequency band or noise in different frequency bands.

6. The air duct assembly of claim 3, wherein the cross-sectional areas of the resonant holes of at least two of the resonant cavities are the same or different.

7. The air duct assembly of claim 3, wherein at least two of the plurality of resonant cavities have the same or different volumes.

8. The air duct assembly according to claim 3, wherein the resonant holes corresponding to at least two of the plurality of resonant cavities are circular, the axial lengths of the circular resonant holes are the same or different, and the axial direction of the circular resonant holes is perpendicular to the cross section of the resonant holes.

9. The air duct assembly of claim 2, wherein a helical blade is attached to an outer wall of the hollow cylinder, the helical blade defining the air outlet duct in a helical shape with the duct wall and the hollow cylinder.

10. The air duct assembly according to claim 9, wherein the cavity wall of each resonant cavity is provided with at least two sections of the helical blade, and the resonant hole corresponding to each resonant cavity is provided between two adjacent sections of the helical blade.

11. The air duct assembly of claim 9, wherein a sealant is disposed between the helical blade and the duct wall.

12. The air duct assembly according to any one of claims 1 to 11, wherein the air outlet duct is filled with sound-deadening cotton.

13. The air duct assembly according to claim 12, wherein at least two kinds of noise reduction cotton with different densities are filled in the air outlet duct.

14. A main machine of a dust collector, which is characterized by comprising a main machine shell, a negative pressure generating mechanism and an air duct assembly according to any one of claims 1 to 13, wherein the main machine shell is provided with an air inlet and an air outlet, the negative pressure generating mechanism and the air duct assembly are arranged in the main machine shell, the inner wall of the main machine shell forms an air duct wall of the air duct assembly, two ends of an air outlet duct defined by the air duct wall are respectively communicated with the air inlet and the air outlet of the main machine shell, and the negative pressure generating mechanism is used for driving air to flow from the air inlet to the air outlet.

15. The main vacuum cleaner according to claim 14, wherein the air outlet is provided with a filter, a first mounting rack and a second mounting rack are further arranged in the main housing, the first mounting rack is used for mounting the negative pressure generating mechanism, and the second mounting rack is used for mounting the filter; the noise reducer of the air duct assembly is clamped between the negative pressure generating mechanism and the filter.

16. A vacuum cleaner, comprising: the dust cup and the main vacuum cleaner of claim 14 or 15, wherein the dust cup is provided with a dust suction opening and an air exhaust opening, and the air exhaust opening is communicated with an air inlet of the main vacuum cleaner.

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