CN218186630U - Cleaning equipment and power device thereof - Google Patents

Abstract

A cleaning device and a power device thereof. The power device comprises: the air conditioner comprises a shell, a fan and a controller, wherein the shell is provided with an air inlet and an air outlet; the fan is arranged in the shell, an air outlet flow channel communicated with the air outlet is formed between the fan and the shell, and an air inlet flow channel communicated with the air inlet and the air outlet flow channel is arranged in the fan; and the noise reducer is an acoustic metamaterial device, is arranged in the air outlet flow channel, constructs a slow sound flow channel in the air outlet flow channel and is set to reduce the sound wave speed in the air outlet flow channel so as to reduce the airflow noise of the power device. According to the embodiment of the application, the noise reducer is additionally arranged in the air outlet flow passage, and the noise reducer forms the slow sound flow passage in the air outlet flow passage, so that the sound wave speed in the air outlet flow passage can be reduced, and the pneumatic noise of the power device is reduced; the size and the cost of the product cannot be additionally increased, and the working noise of the cleaning equipment can be reasonably reduced under the condition that the volume of the product is not additionally increased.

Description

Cleaning equipment and power device thereof

Technical Field

The application relates to but is not limited to the technical field of cleaning equipment, in particular to cleaning equipment and a power device thereof.

Background

Currently, floor washers and other cleaning devices are increasingly used. However, the noise generated by the cleaning device during operation is usually relatively large, which results in poor long-term use experience for users and complaints.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved provides a power device for cleaning device, can effectively reduce the noise that cleaning device produced in the course of the work to improve user's use and experience.

The embodiment of the application provides a power device for cleaning equipment, includes: the air conditioner comprises a shell, a fan and a controller, wherein the shell is provided with an air inlet and an air outlet; the fan is arranged in the shell, an air outlet flow channel communicated with the air outlet is formed between the fan and the shell, and an air inlet flow channel communicated with the air inlet and the air outlet flow channel is arranged in the fan; and the noise reducer is an acoustic metamaterial device, is arranged in the air outlet flow channel, constructs a slow sound flow channel in the air outlet flow channel and is set to reduce the speed of sound waves in the air outlet flow channel so as to reduce the airflow noise of the power device.

The power device for the cleaning equipment provided by the embodiment of the application comprises a shell, a fan and a noise reducer. The fan is arranged in the shell. An air inlet channel is arranged in the fan, an air outlet channel is formed between the fan and the shell, and the air inlet, the air inlet channel, the air outlet channel and the air outlet are communicated in sequence to form a suction channel of the power device. The fan may include a motor and a moving impeller. The motor is used as a power source and can drive the movable impeller to rotate, so that negative pressure is generated in the air inlet channel, and then external substances such as dust and the like can be sucked from the air inlet along with air flow, and the cleaning function of the cleaning equipment is realized.

In the working process, the flow velocity of the air flow in the suction flow channel is large, the sound pressure level of the generated broadband noise is too high, the long-term use experience of a user is poor, and complaints are generated. The noise reducer is additionally arranged in the air outlet flow channel, and the noise reducer constructs the slow sound flow channel in the air outlet flow channel, so that the sound wave speed in the air outlet flow channel can be reduced, and the pneumatic noise of the power device is reduced.

In addition, the noise reducer is arranged in the air outlet flow channel, so that the air flow speed in the air inlet flow channel cannot be influenced, and the power device is favorably ensured to have higher suction power; the size and the cost of the product cannot be additionally increased, and the working noise of the cleaning equipment can be reasonably reduced under the condition that the volume of the product is not additionally increased.

In addition, the noise reducer of the embodiment of the application is an acoustic metamaterial device. The acoustic metamaterial is a kind of artificial composite material, and the functions which cannot be realized by common materials can be realized by periodically and orderly designing the structure of the metamaterial, so that a plurality of peculiar physical effects are generated, for example, the functions of sound wave space compression, signal buffering, sound wave speed reduction (namely, slow sound function) and the like are realized by using advanced slow sound devices. The noise reducer provided by the embodiment of the application is a slow sound device prepared from the acoustic metamaterial, can realize the function which cannot be realized by common materials, and is beneficial to improving the noise reduction effect.

On the basis of the technical scheme, the method can be further improved as follows.

In an exemplary embodiment, the slow sound flow passage rotates along the circumferential direction of the fan and extends along the axial direction of the fan, so that the air flow in the slow sound flow passage advances around the rotation of the fan to flow to the air outlet.

In an exemplary embodiment, the noise reducer includes: and the noise reduction plate rotates along the circumferential direction of the fan and extends along the axial direction of the fan so as to construct the slow sound flow channel in the air outlet flow channel.

In an exemplary embodiment, the number of the noise reduction plates is multiple, and the multiple noise reduction plates are staggered along the circumferential direction and the axial direction of the fan, so as to construct multiple slow sound flow channels in the air outlet flow channel.

In an exemplary embodiment, the noise reduction plate is a spiral type structure.

In an exemplary embodiment, the noise reduction plate is of a constant pitch helical type structure; or the noise reduction plate is of a variable-pitch spiral structure.

In an exemplary embodiment, the surface of the noise reduction plate is a closed surface; or at least one part of the noise reduction plate is provided with air holes.

In an exemplary embodiment, the noise reducer further comprises: and the side coaming is sleeved between the fan and the noise reduction plate, and the radial inner end of the noise reduction plate is fixedly connected with the side coaming.

In an exemplary embodiment, a gap is formed between the side enclosing plate and the fan, the power device further includes a first vibration damping pad, a part of the first vibration damping pad is sandwiched between the side enclosing plate and the fan, and another part of the first vibration damping pad is sandwiched between the first axial end of the fan and the housing.

In an exemplary embodiment, the power plant further comprises: and the second vibration damping pad is clamped between the axial second end part of the fan and the shell.

In an exemplary embodiment, the housing includes: the noise reducer and a part of the fan are positioned in the shell, one end of the shell is open, and the air outlet flow channel is positioned in the shell; and an end cap covering the open end of the housing; a first sealing ring is arranged between the end cover and the fan to limit the airflow in the air outlet flow channel from entering the end cover; and a second sealing ring is arranged between the end cover and the shell so as to limit the leakage of the airflow in the air outlet flow passage from the connecting part of the end cover and the shell.

In an exemplary embodiment, the air inlet is arranged on an end wall of the shell far away from the end cover; the air outlet is arranged on the end wall of the shell, which is far away from the end cover, and is positioned on the radial outer side of the air inlet; and/or the air outlet is arranged at the end part, far away from the end cover, of the side wall of the shell.

An embodiment of the present application further provides a cleaning device, including: a body; and the power device in any one of the above embodiments, which is installed on the machine body.

Drawings

FIG. 1 is a schematic structural diagram of a power plant provided in an embodiment of the present application;

FIG. 2 isbase:Sub>A cross-sectional view of the power plant of FIG. 1 along direction A-A;

fig. 3 is a schematic structural diagram of a noise reducer provided in an embodiment of the present application;

FIG. 4 is a cross-sectional view of the noise reducer of FIG. 3 along direction B-B;

fig. 5 is a schematic perspective view of a noise reducer according to another embodiment of the present application;

fig. 6 is a schematic perspective view of a noise reducer according to another embodiment of the present application;

fig. 7 is a schematic perspective view of a noise reducer according to yet another embodiment of the present application;

FIG. 8 is a schematic perspective view of a housing according to an embodiment of the present application;

FIG. 9 is a bottom view of the housing of FIG. 8;

FIG. 10 is a front view of the housing of FIG. 8;

FIG. 11 is a cross-sectional view of the housing of FIG. 10 in the direction C-C;

FIG. 12 is a schematic structural view of a housing provided in accordance with another embodiment of the present application;

FIG. 13 is a cross-sectional view of the housing of FIG. 12 in the direction D-D;

FIG. 14 is a perspective view of an end cap according to an embodiment of the present application;

FIG. 15 is a bottom view of the tip cap of FIG. 14;

FIG. 16 is a front view of the tip cap of FIG. 14;

FIG. 17 is a cross-sectional view of the end cap E-E shown in FIG. 16;

FIG. 18 is a schematic perspective view of a first damping pad according to an embodiment of the present application;

FIG. 19 is a cross-sectional structural view of the first damping pad shown in FIG. 18;

FIG. 20 is a schematic perspective view of a second damping pad according to an exemplary embodiment of the present disclosure;

FIG. 21 is a cross-sectional structural view of the second damping pad of FIG. 20;

fig. 22 is a schematic perspective view of a first seal ring according to an embodiment of the present application;

FIG. 23 is a cross-sectional view of the first seal ring of FIG. 22;

fig. 24 is a schematic perspective view of a second seal ring according to an example of the present application;

fig. 25 is a cross-sectional structural view of the second seal ring shown in fig. 24.

In the drawings, the components represented by the respective reference numerals are listed below:

1, a shell body, 11 shells, 111 air inlets, 112 air outlets, 113 supporting bosses, 114 air outlet flow passages, 115 connecting columns, 12 end covers, 121 accommodating cavities and 122 bolt holes;

2, a fan, 21 a motor, 22 movable impellers, 23 air inlet channels and 24 sealing grooves;

3, a noise reducer, 31, noise reduction plates, 311 air passing holes, 32 side enclosing plates and 33 slow sound flow channels;

41 a first damping pad, 411 a radial damping portion, 412 an axial damping portion, 42 a second damping pad, 421 an annular flange, 43 a first sealing ring, 44 a second sealing ring.

Detailed Description

The principles and features of this application are described below in conjunction with the following drawings, the examples of which are set forth to illustrate the application and are not intended to limit the scope of the application.

As shown in fig. 1 and 2, an embodiment of the present application provides a power device for a cleaning apparatus, including: a housing 1, a fan 2 and a noise reducer 3.

Wherein the housing 1 is provided with an air inlet 111 and an air outlet 112.

The blower 2 is disposed in the casing 1, and an air outlet flow channel 114 communicated with the air outlet 112 is formed between the blower and the casing 1. An air inlet channel 23 communicated with the air inlet 111 and the air outlet channel 114 is arranged in the fan 2.

The noise reducer 3 is an acoustic metamaterial device. The noise reducer 3 is disposed in the outlet flow channel 114, and forms a slow sound flow channel 33 in the outlet flow channel 114. Noise reducer 3 is configured to reduce the velocity of sound waves in outlet flow path 114 to reduce the flow noise of the power plant.

The power device for the cleaning equipment provided by the embodiment of the application comprises a shell 1, a fan 2 and a noise reducer 3. The fan 2 is disposed within the housing 1. An air inlet flow channel 23 is arranged in the fan 2, an air outlet flow channel 114 is formed between the fan 2 and the casing 1, and the air inlet 111, the air inlet flow channel 23, the air outlet flow channel 114 and the air outlet 112 are sequentially communicated to form a suction flow channel of the power device, as shown in fig. 2. The fan 2 may include a motor 21 and a movable impeller 22. The motor 21 is used as a power source and can drive the movable impeller 22 to rotate, so that negative pressure is generated in the air inlet channel 23, and further, external dust and other substances can be sucked from the air inlet 111 along with the air flow, and the cleaning function of the cleaning device is realized.

In the working process, the flow velocity of the air flow in the suction flow channel is large, the sound pressure level of the generated broadband noise is too high, the long-term use experience of a user is poor, and complaints are generated. In the embodiment of the present application, the noise reducer 3 is added in the outlet flow channel 114, and the noise reducer 3 forms the slow sound flow channel 33 in the outlet flow channel 114, so that the sound wave speed in the outlet flow channel 114 can be reduced, thereby reducing the aerodynamic noise of the power plant.

Moreover, the noise reducer 3 is arranged in the air outlet flow channel 114, so that the air flow speed in the air inlet flow channel 23 is not influenced, and the power device is favorably ensured to have higher power absorption; the size and the cost of the product cannot be additionally increased, and the working noise of the cleaning equipment can be reasonably reduced under the condition that the volume of the product is not additionally increased.

In addition, the noise reducer 3 of the embodiment of the present application is an acoustic metamaterial device. The acoustic metamaterial is a kind of artificial composite material, and the functions which cannot be realized by common materials can be realized by periodically and orderly designing the structure of the metamaterial, so that a plurality of peculiar physical effects are generated, for example, the functions of sound wave space compression, signal buffering, sound wave speed reduction (namely, slow sound function) and the like are realized by using advanced slow sound devices. The noise reducer 3 in the embodiment of the application is a slow sound device prepared from the acoustic metamaterial, can realize the function which cannot be realized by common materials, and is beneficial to improving the noise reduction effect.

In an exemplary embodiment, as shown in fig. 2, the slow sound channel 33 extends in the axial direction of the fan 2 while rotating in the circumferential direction of the fan 2, so that the air flow in the slow sound channel 33 flows toward the outlet 112 while rotating around the fan 2.

In this embodiment, the slow sound channel 33 extends along the circumferential direction of the fan 2 and extends along the axial direction of the fan 2, and may form a spiral shape or a shape similar to a spiral shape. Thus, when the air flows along the slow sound duct 33, the air flows in a direction approaching the outlet 112 while rotating around the fan 2. Therefore, the speed of sound waves can be reduced, and the slow sound function is realized to reduce pneumatic noise; the air flow path can be greatly prolonged, and a part of sound energy is consumed, so that the noise reduction effect is further improved.

The specific shape of the slow sound channel 33 is not limited, for example, the cross-sectional areas of the parts of the slow sound channel 33 may be equal or unequal; the center line of the slow sound channel 33 may be a smooth curve or a polygonal line.

In other embodiments, the shape of the slow sound flow passage 33 is not limited to the above-described spiral or spiral-like shape, and the flow direction of the slow sound flow passage 33 may also be in a wave shape, a step shape, a serpentine shape, or the like.

In an exemplary embodiment, the noise reducer 3 includes: a noise reduction plate 31, as shown in fig. 2 to 7. The noise reduction plate 31 rotates in the circumferential direction of the fan 2 and extends in the axial direction of the fan 2 to form a slow sound flow passage 33 in the outlet flow passage 114.

In this embodiment, the noise reduction plate 31 extends along the circumferential direction of the fan 2 and extends along the axial direction of the fan 2, and is in a spiral shape or a shape similar to a spiral shape (for example, a shape similar to a spiral shape formed by sequentially turning and connecting a plurality of flat plates, or a shape similar to a spiral staircase). Thus, a spiral or spiral-like slow sound channel 33 can be formed by one noise reduction plate 31, which is beneficial to simplifying the structure of the noise reducer 3.

In an exemplary embodiment, the number of the noise reduction plates 31 is plural, as shown in fig. 5 and 7. The plurality of noise reduction plates 31 are staggered in the circumferential direction and the axial direction of the fan 2 to form a plurality of slow sound flow passages 33 in the outlet flow passage 114.

Thus, the noise reduction plates 31 cooperate with each other to form a plurality of spiral or spiral-like slow sound channels 33 in the outlet flow channel 114, so as to further improve the slow sound effect of the noise reducer 3 and further reduce the airflow noise.

In addition, through reasonable design, the phase of sound waves can be changed through the slow sound flow channels 33, the effect of superposition cancellation of different sound waves is achieved, and therefore the noise reduction effect is further improved.

Wherein the inlets of the plurality of slow sound passages 33 are arranged at intervals in the circumferential direction of the noise reducer 3, and the outlets of the plurality of slow sound passages 33 are arranged at intervals in the circumferential direction of the noise reducer 3.

Illustratively, when the noise reduction plates 31 are of a spiral type structure, two noise reduction plates 31 may form a double spiral structure (two noise reduction plates 31 are 180 ° out of phase as shown in fig. 5 and 7), three noise reduction plates 31 may form a triple spiral structure (two adjacent noise reduction plates 31 are 120 ° out of phase), and four noise reduction plates 31 may form a quadruple spiral structure (two adjacent noise reduction plates 31 are 90 ° out of phase).

In an exemplary embodiment, the noise reduction plate 31 is a spiral-type structure, as shown in fig. 3-7.

The noise reduction plate 31 is of a spiral structure, so that the noise reducer 3 can form a spiral slow sound device (namely, an acoustic metamaterial with a spiral structure, which is called a spiral metamaterial for short). Researches show that the spiral structure metamaterial can realize sound deceleration at a sub-wavelength scale and bring remarkable phase change. The phase adjustment can be flexibly realized by changing the spiral distance of the spiral structure. Compared with a labyrinth metamaterial, the spiral-structure metamaterial can be regarded as an equivalent high-refractive-index acoustic medium as a whole, and an additional rigid medium is not required to be introduced, so that the dispersion problem of a slow-sound device is solved in a large frequency range. Meanwhile, by arranging the spiral structure with continuously changed intervals, equivalent acoustic impedance with spatial gradient can be generated, and efficient broadband coupling of the slow-sound device is realized.

In an exemplary embodiment, the noise reduction plate 31 is a constant pitch helical type structure, as shown in fig. 5, 6 and 7.

In another exemplary embodiment, the noise reduction plate 31 is a variable pitch helical type structure, as shown in fig. 3 and 4.

The noise reduction plate 31 is of a uniform pitch spiral structure, that is, the pitch of the noise reduction plate 31 is uniformly fixed, and the sectional area of the slow sound flow passage 33 is also uniformly fixed. Such noise reduction plate 31 has a simple structure and is convenient to machine and form.

Alternatively, the noise reduction plate 31 may have a variable pitch helical structure, i.e., the pitch of the noise reduction plate 31 is not uniform and is varied.

Wherein, to specific cleaning equipment, can detect the frequency channel of its pneumatic noise, through the quantity etc. of the pitch of rational design helical structure, spirochete based on the testing result, can absorb the noise of appointed frequency section, and then effectively reduce pneumatic noise, also can absorb the low band noise, improve the sound quality, promote user and use experience.

For a variable pitch helix type configuration of the noise reduction plate 31, the pitch of the noise reduction plate 31 may be gradually increased or gradually decreased.

In an exemplary embodiment, the face of the noise reduction plate 31 is a closed face, as shown in fig. 3, 4, and 5.

Compare in offering the scheme of gas pocket 311 on falling the board 31 of making an uproar, this scheme will fall the face design of the board 31 of making an uproar for sealing the face, promptly: the noise reduction plate 31 is not provided with the air passing holes 311, so that more sound wave energy can be consumed in the air flow channel, and the noise reduction effect is further improved.

In another exemplary embodiment, at least a portion of the noise reduction plate 31 is lined with air holes 311, as shown in fig. 6 and 7.

Compared with the scheme that the surface of the noise reduction plate 31 is a closed surface, the air holes 311 are formed in the noise reduction plate 31, so that the flow area of air flow is increased, the wind resistance generated by the noise reduction plate 31 can be reduced, the suction function of the power device is improved, and the suction function is an important index of the core performance of the cleaning equipment.

The distribution form of the air passing holes 311 is not limited, and the shape and size of the air passing holes 311 can be reasonably designed according to needs. The distribution range of the air holes 311 is not limited, and the air holes 311 may be provided over the entire noise reduction plate 31 or only in a partial region of the noise reduction plate 31.

For example, as shown in fig. 6 and 7, the plurality of air passing holes 311 may be uniformly arranged on the entire noise reduction plate 31. The plurality of air passing holes 311 may be arranged in multiple rows along the radial direction of the noise reduction plate 31, the shape of the air passing holes 311 is circular, and the size of the air passing holes 311 is consistent. Therefore, the shape of the noise reduction plate 31 is regular, and the processing and forming are convenient.

In an exemplary embodiment, the noise reducer 3 further includes: side enclosures 32 as shown in fig. 2-7. The side enclosures 32 may be cylindrical shells.

Wherein, the side wall plate 32 is sleeved between the fan 2 and the noise reduction plate 31, as shown in fig. 2. The radially inner end of the noise reduction plate 31 is fixedly connected with the side wall plate 32.

Thus, the side coaming 32 can play a role of fixing and supporting the noise reduction plate 31, which is beneficial to improving the position stability and the use reliability of the noise reducer 3.

In one example, the radially outer end of the noise reduction plate 31 abuts the inner side wall of the housing 1, as shown in fig. 2.

In this way, both the radially inner end and the radially outer end of the noise reduction plate 31 are closed. The air flow in the air outlet channel can only flow to the air outlet 112 along the slow sound channel 33, and the conditions of vortex flow and the like can not be generated at the two radial ends of the slow sound channel 33, so that the noise reduction effect is favorably improved.

In addition, the noise reducer 3 can be prevented from shaking and colliding with the shell 11 or the fan 2 under the impact action of the airflow, so that the position stability and the use reliability of the noise reducer 3 are further improved, and the noise reducer 3 can be prevented from generating vibration noise.

In other embodiments, the noise reducer 3 may not include the side enclosures 32. Such as: the noise reduction plate 31 is directly fixed to the casing of the fan 2, or is integrally formed with the casing of the fan 2; alternatively, the noise reduction plate 31 is fixed to the inner side wall of the housing 11, or is integrally formed with the housing 11; alternatively, a part of the noise reduction plate 31 is fixed to the casing of the fan 2 (or formed integrally with the casing of the fan 2), and the other part of the noise reduction plate 31 is fixed to the inner side wall of the housing 11 (or formed integrally with the housing 11)

In an exemplary embodiment, there is a gap between the side gusset 32 and the fan 2, as shown in FIG. 2. The power plant further comprises a first damping pad 41. A part of the first vibration damping pad 41 is interposed between the side shroud 32 and the fan 2, and as shown in fig. 2, the other part of the first vibration damping pad 41 is interposed between the first axial end of the fan 2 and the casing 1.

After the fan 2 is assembled, the two axial ends of the fan can be supported by the shell 1, so that the position stability of the fan 2 is ensured. Since the motor 21 may vibrate during operation, the vibration of the motor 21 may be transmitted to a contacted component and then to the outside, thereby generating harsh single-frequency vibration noise.

Therefore, the scheme arranges a gap between the side wall plate 32 and the fan 2, and can prevent the vibration of the motor 21 from being spread to the noise reducer 3 in a large quantity. The first vibration damping pad 41 is provided between the side wall 32, the fan 2, and the first vibration damping pad 41 spaces the side portion of the fan 2 from the side wall 32 of the noise reducer 3 and spaces the first axial end portion of the fan 2 (i.e., the end portion where the impeller 22 is provided) from the corresponding position of the casing 1. Therefore, the vibration reduction effect on the motor 21 is effective, the transmission of mechanical vibration generated by the motor 21 to the noise reducer 3 and the shell 1 is reduced, the vibration attenuation rate of the motor 21 is improved, and the mechanical vibration noise of the power device is reduced.

The first damping pad 41 may be, but is not limited to, soft silicone rubber.

In one example, as shown in fig. 18 and 19, the first damping pad 41 is an annular structure. The impeller 22 is located at an axial first end of the fan 2. The first damping pad 41 includes an annular radial damping portion 411 and an annular axial damping portion 412. The radial vibration damping portion 411 is located between the side wall plate 32 of the noise reducer 3 and the fan 2, and the axial vibration damping portion 412 is located between the axial first end portion of the fan 2 and the housing 1. The axial vibration mitigation part 412 is connected to the radial vibration mitigation part 411 and is located radially inside the radial vibration mitigation part 411. The axial vibration reduction part 412 is arranged to be of a stepped structure, is matched with the shape of the axial first end part of the fan 2, can support the axial first end part of the fan 2, and ensures the stability of the axial first end part of the fan 2.

The axial first end of the housing 11 is provided with a support boss 113, as shown in fig. 11 and 13. The axial vibration damping portion 412 of the first vibration damping pad 41 may be supported on the support boss 113. The air inlet 111 penetrates through the supporting boss 113, and the air inlet 111 is in a circular truncated cone shape or a horn mouth shape. Along the intake air direction, the cross-sectional area of the intake port 111 gradually decreases. The axial vibration damping portion 412 is provided with a through hole communicating with the air inlet 111, and a hole wall of the through hole is aligned with the air inlet 111 and extends obliquely along an oblique direction of an inner wall surface of the air inlet 111. Therefore, the air inlet ventilation area of the power device is large, and the power device is favorable for improving the power absorption.

In an exemplary embodiment, the power plant further comprises: and a second damping pad 42. The second vibration damping pad 42 is interposed between the second axial end portion of the fan 2 and the casing 1, as shown in fig. 2.

According to the scheme, the second vibration damping pad 42 is additionally arranged between the second axial end part of the fan 2 and the shell 1, so that the motor 21 can be buffered and damped, the transmission of the vibration of the motor 21 to the shell 1 is weakened, the vibration attenuation rate of the motor 21 is improved, and the vibration noise of the power device can be reduced.

The second damping pad 42 may be, but is not limited to, soft silicone rubber.

In an exemplary embodiment, as shown in fig. 1 and 2, the housing 1 includes: a housing 11 and an end cap 12. The noise reducer 3 and a part of the fan 2 are located in the casing 11, one end of the casing 11 is open, and the air outlet flow passage 114 is located in the casing 11. An end cap 12 covers the open end of the housing 11.

As shown in fig. 2, a first sealing ring 43 (shown in fig. 22 and 23) is disposed between the end cover 12 and the fan 2 to limit the airflow in the airflow channel 114 from entering the end cover 12. A second gasket 44 (shown in fig. 24 and 25) is provided between end cap 12 and housing 11 to limit leakage of the gas flow in outlet flow path 114 from the connection between end cap 12 and housing 11.

The casing 1 comprises an outer shell 11 and an end cover 12, and one end of the outer shell 11 is arranged in an open mode, so that the fan 2 and the noise reducer 3 can be assembled conveniently. The first sealing ring 43 is arranged between the end cover 12 and the fan 2, so that the airflow in the air outlet flow passage 114 can be prevented from flowing into the end cover 12, and the power absorption of the power device is improved. The second sealing ring 44 is disposed between the end cover 12 and the housing 11, so as to prevent the airflow in the outlet flow channel 114 from leaking outwards, and also to improve the power absorption of the power plant. Thus, the airflow output by the inlet flow channel 23 of the fan 2 can only flow to the air outlet 112 through the outlet flow channel 114 in the housing 11 to be discharged, and the working efficiency of the power device is effectively ensured.

In one example, as shown in fig. 14 to 17, the end cap 12 is bulged at a middle portion to form a receiving cavity 121, and the axial second end portion of the fan 2 is located in the receiving cavity 121. An end of the second vibration damping pad 42 adjacent to the fan 2 is provided with an annular flange 421, as shown in fig. 20 and 21. The axial second end of the fan 2 is provided with a seal groove 24 (shown in fig. 2), and the seal flange is inserted into the seal groove 24. One end of the second vibration damping pad 42 far away from the fan 2 abuts against the end cover 12. This ensures that the first damping washer 41 and the axial second end of the fan 2 are fixed in place. The first sealing ring 43 is located between the axial second end of the fan 2 and the side wall of the accommodating cavity 121, thereby preventing the airflow in the outlet flow passage 114 from entering the accommodating cavity 121 of the end cover 12. The second sealing ring 44 is in concave-convex fit with the open end of the housing 11, so that the stability of the second sealing ring 44 is ensured. The casing is provided with a connecting column 115, and the end cover 12 is correspondingly provided with a bolt hole 122. The end cap 12 presses against the second seal ring 44 and is fastened to the housing 11 by fasteners such as bolts.

During assembly, the first damping pad 41 may be first placed on the supporting boss 113 of the housing 11. The noise reducer 3 is then fitted over the outside of the fan 2 and placed together in the housing 11. Then, the first seal ring 43, the second seal ring 44 and the second damping pad 42 are mounted, and then the end cap 12 is covered and fixed.

In an exemplary embodiment, the intake vent 111 is provided in an end wall of the housing 11 remote from the end cap 12, as shown in FIG. 2.

In one example, the outlet vent 112 is provided in an end wall of the housing 11 remote from the end cap 12 and radially outward of the inlet vent 111, as shown in fig. 8-11.

In another example, the air outlet 112 is provided at the end of the side wall of the housing 11 remote from the end cap 12, as shown in fig. 12 and 13.

The air inlet 111 is formed in the end wall of the housing 11 away from the end cover 12, and may be disposed opposite to the movable impeller 22 of the fan 2, so as to facilitate the airflow to enter the air inlet channel 23 quickly and efficiently, so as to ensure the power absorption of the power plant.

The air outlet 112 is disposed in the region of the outer shell 11 away from the end cap 12, which is beneficial to increase the length of the air outlet flow channel 114 along the axial direction of the fan 2, and further is convenient for placing the noise reducer 3, and is also convenient for designing the spiral slow sound flow channel 33.

The air outlet 112 may be disposed on an end wall of the housing 11 away from the end cap 12, or in an area of a side wall of the housing 11 away from the end cap 12, or the air outlets 112 may be disposed at two positions, which may be reasonably designed according to needs in an actual production process.

In one example, the intake vent 111 is a fully open large vent design that facilitates rapid airflow into the intake runner 23 to ensure greater suction of the power plant. The air outlet 112 can be designed into a plurality of air outlets, so that part of sound energy can be further consumed in the process of flowing air out of the air outlet 112, and the noise reduction effect is further improved.

Four specific embodiments of the noise reducer 3 will be described below with reference to the drawings.

In the first embodiment, as shown in fig. 5, the noise reducer 3 includes two spiral-type noise reduction plates 31 and a side shroud 32. The phase difference between the two noise reduction plates 31 is 180 °. The surface of the noise reduction plate 31 is a closed surface. The pitches of the two noise reduction plates 31 are equal and fixed.

In a second embodiment, as shown in fig. 3 and 4, the noise reducer 3 includes a side shroud 32 and a noise reduction plate 31 of a spiral type. The surface of the noise reduction plate 31 is a closed surface. The pitch of the noise reduction plate 31 is not fixed.

In a third embodiment, as shown in fig. 6, the noise reducer 3 includes a side shroud 32 and a noise reduction plate 31 of a spiral type. The noise reduction plate 31 is full of ventilation holes. The pitches of the two noise reduction plates 31 are equal and fixed.

In the fourth embodiment, as shown in fig. 7, the noise reducer 3 includes two spiral-type noise reduction plates 31 and a side shroud 32. The phase difference between the two noise reduction plates 31 is 180 °. Both noise reduction plates 31 are full of ventilation holes. The pitches of the two noise reduction plates 31 are equal and fixed.

Through detection and comparison, the power device adopting the four specific embodiments has the advantages that pneumatic noise is effectively reduced, and therefore the power device has a good noise reduction effect.

The embodiment of the present application further provides a cleaning device (not shown in the drawings), including: a fuselage and a power plant as in any one of the previous embodiments. The power device is arranged on the machine body.

The cleaning device provided by the embodiment of the application comprises the power device in any one of the embodiments, so that all the beneficial effects of any one of the embodiments are achieved, and the description is omitted.

In one example, the cleaning apparatus is a scrubber.

The noise generated by the floor washing machine in the using process is usually very large, the floor washing machine is limited by the diversity of working environments and functions, and the available noise reduction space is insufficient. The noise composition of the floor washing machine is complex, and the occupied frequency band is wide. However, the floor washing machine has a relatively simple structure and a narrow internal space, so that many conventional and effective noise reduction measures are difficult to adopt. And when the floor washing machine is used, in order to avoid that water vapor with bacteria remains in the power module to cause the iron core to rust and smell at the same time, a porous sound absorption material is not generally allowed to be used, and great challenge is brought to noise reduction of the power device.

Therefore, noise control compliance is a critical issue in the development of scrubber machines. The current floor scrubber's noise reduction effect is poor, still has great noise, and the broadband noise sound pressure level that single-frequency noise thorn ear, the air current that especially motor vibration produced is too high, leads to the user to use for a long time and experiences poorly, produces complaining.

Aiming at the floor washing machine, the noise reducer (or the spiral acoustic superstructure) in the form of the spiral acoustic metamaterial can be arranged in the power device of the floor washing machine, the spiral acoustic superstructure is placed between the fan and the shell, and extra space is not required to be added, so that the noise generated by the power device can be reasonably reduced under the condition of not increasing extra volume; by reasonably designing the characteristics of the screw pitch, the number of the spiral bodies and the like of the spiral acoustic superstructure, the noise of a specified frequency band can be absorbed, so that the pneumatic noise is effectively reduced, the low-frequency band noise can be absorbed, the sound quality is improved, and the use experience of a user is improved; through setting up first damping pad and second damping pad, can effectively reduce the vibration noise of motor. Through the detection, the floor washing machine adopting the noise reduction design has the advantages that the single-frequency noise and the whole noise can be reduced by more than 10 decibels, and the hearing sense can be effectively improved.

In summary, the power device and the cleaning equipment provided by the embodiment of the application can effectively reduce mechanical noise and pneumatic noise generated by the power device by the combined noise reduction scheme of the noise reducer of the acoustic metamaterial slow-sound device and the elastic vibration damping pad, so that the overall noise of the floor washing machine is reduced, the use experience of users is further improved, the product competitiveness is improved, and the brand awareness and recognition degree are improved; and the problem of noise in a limited space is solved, and the size and the cost of the product cannot be additionally increased.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

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

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. 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.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (13)

1. A power plant, comprising:

the air conditioner comprises a shell, a fan and a controller, wherein the shell is provided with an air inlet and an air outlet;

the fan is arranged in the shell, an air outlet flow channel communicated with the air outlet is formed between the fan and the shell, and an air inlet flow channel communicated with the air inlet and the air outlet flow channel is arranged in the fan; and

the noise reducer is an acoustic metamaterial device and is arranged in the air outlet flow channel, a slow sound flow channel is constructed in the air outlet flow channel, and the slow sound flow channel is set to reduce the speed of sound waves in the air outlet flow channel so as to reduce the airflow noise of the power device.

2. The power plant of claim 1,

the slow sound flow channel rotates along the circumferential direction of the fan and extends along the axial direction of the fan, so that the airflow in the slow sound flow channel flows to the air outlet in a forward mode around the rotation of the fan.

3. The power plant of claim 2, wherein the noise reducer comprises:

and the noise reduction plate rotates along the circumferential direction of the fan and extends along the axial direction of the fan so as to construct the slow sound flow channel in the air outlet flow channel.

4. The power plant of claim 3,

the number of the noise reduction plates is multiple, and the noise reduction plates are arranged in a staggered mode along the circumferential direction and the axial direction of the fan, so that the slow sound flow channels are constructed in the air outlet flow channel.

5. The power plant of claim 3,

the noise reduction plate is of a spiral structure.

6. The power plant of claim 5,

the noise reduction plate is of a uniform-pitch spiral structure; or

The noise reduction plate is of a variable-pitch spiral structure.

7. The power plant according to any one of claims 3 to 6,

the surface of the noise reduction plate is a closed surface; or

At least one part of the noise reduction plate is provided with air holes.

8. The power plant of any one of claims 3 to 6, wherein the noise reducer further comprises:

and the side coaming is sleeved between the fan and the noise reduction plate, and the radial inner end of the noise reduction plate is fixedly connected with the side coaming.

9. The power plant of claim 8,

the power device further comprises a first vibration damping pad, one part of the first vibration damping pad is clamped between the side enclosing plate and the fan, and the other part of the first vibration damping pad is clamped between the axial first end of the fan and the shell.

10. The power plant of any one of claims 1 to 6, further comprising:

and the second vibration damping pad is clamped between the axial second end part of the fan and the shell.

11. The power unit of any one of claims 1 to 6, wherein the housing comprises:

the noise reducer and a part of the fan are positioned in the shell, one end of the shell is open, and the air outlet flow channel is positioned in the shell; and

the end cover is arranged at the open end of the shell in a covering mode;

a first sealing ring is arranged between the end cover and the fan so as to limit the air flow in the air outlet flow channel from entering the end cover;

and a second sealing ring is arranged between the end cover and the shell so as to limit the leakage of the air flow in the air outlet flow channel from the connecting part of the end cover and the shell.

12. The power plant of claim 11,

the air inlet is formed in the end wall, far away from the end cover, of the shell;

the air outlet is arranged on the end wall of the shell, which is far away from the end cover, and is positioned on the radial outer side of the air inlet; and/or the air outlet is arranged at the end part of the side wall of the shell, which is far away from the end cover.

13. A cleaning apparatus, comprising:

a body; and

the power plant of any one of claims 1 to 12, mounted to the fuselage.

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