CN218207243U - Fan guard subassembly and cleaning device - Google Patents

Abstract

The application relates to a fan guard assembly and cleaning equipment, and belongs to the technical field of cleaning equipment. The fan cover assembly comprises a fan, a silencing pad, a silencing cover and a fan cover, a cavity is formed between the fan and the fan cover, the silencing cover and the silencing pad are both positioned in the cavity, the silencing pad is of a hollow annular structure, the bottom end of the silencing pad is abutted to one end of the fan, the top end of the silencing pad is provided with at least one axial hole groove extending along the axial direction of the silencing pad and/or a circumferential hole groove extending along the circumferential direction on the groove wall of the axial hole groove, the hole grooves are of 1/4 wavelength tube structures, different depths of the wavelength tubes are designed, the noise reduction range can be increased aiming at different noise peak frequencies, and the noise reduction effect is improved; the axial hole groove can be a straight through hole structure except a blind hole, the product manufacturability is improved by utilizing the abutting of the bottom end part of the axial hole groove and one end of the fan, the manufacturing is convenient, and the structure is more compact; the present application further provides a cleaning device that includes the above-mentioned fan guard assembly.

Description

Fan guard subassembly and cleaning device

Technical Field

The application belongs to the technical field of cleaning equipment, especially, relate to a fan guard subassembly and cleaning equipment.

Background

At present, most cleaning equipment in the market comprises a dust collector, a floor washing machine, a floor mopping machine, a floor sweeping machine and the like, and a motor is used for driving a moving blade to rotate at a high speed, so that air negative pressure is generated in a sealed cylinder to form a suction source, and then dust or sewage is sucked, and the purpose of cleaning is achieved.

However, the high speed airflow generated by the fan during operation generates a large noise, which further affects the user experience. Some improvements have also been made to how to fall making an uproar to prior art, but mostly set up the fan cover body in order to isolate with external world in the fan outside, perhaps add corresponding buffer at the fan outer wall and come the isolation to fall the noise through the mode of shock attenuation. However, the noise reduction modes are all single in structure and not ideal in noise reduction effect, and the fan cover assembly and the cleaning equipment are designed to solve the problems.

Disclosure of Invention

The application discloses fan guard subassembly and cleaning device, it adopts following technical scheme to realize.

A fan cover assembly comprises a fan, a silencing pad, a silencing cover and a fan cover, wherein a cavity is formed between the fan and the fan cover, and the silencing cover and the silencing pad are both positioned in the cavity.

As a further improvement of the technology, the axial hole groove is constructed in a 1/4 wavelength tube structure.

As a further improvement of the technology, at least one axial hole groove is distributed on the top end part of the silencing pad in a circumferential array on the end surface of the silencing pad.

As a further improvement of the present technique, the axial bore groove depth includes at least two to correspond to at least two noise peak frequencies.

As a further improvement of the technology, the included angle between the central axis of the axial hole groove and the central axis of the silencing pad is greater than or equal to 0.

As a further improvement of the technology, the axial hole groove is a through hole structure penetrating through the top end part and the bottom end part of the silencing pad.

As a further improvement of the present technology, at least one circumferential hole groove is further provided on a groove wall of the axial hole groove in a circumferential direction of the sound-deadening pad and/or in a circumferential tangential direction of the sound-deadening pad.

As a further improvement of the technology, the circumferential hole groove is formed in a 1/4 wavelength tube structure.

As a further improvement of the present technique, the depth of the circumferential hole groove includes at least two kinds to correspond to at least two kinds of noise peak frequencies. Specifically, by setting the lengths of two or more 1/4 wavelength tubes to be different from each other, noise reduction can be achieved for different frequency peaks in noise.

As a further improvement of the technology, the included angle between the connecting line of any two points on the central axis of the circumferential hole groove and the bottom end face of the silencing pad is greater than or equal to 0.

As a further improvement of the technology, the silencing pad is made of silica gel, rubber or thermoplastic elastomer (TPE), and the hardness of the silencing pad is preferably 35-40 degrees.

As a further improvement of the present technology, the fan further includes another sound-deadening pad, and a bottom end portion thereof abuts against the other end of the fan. Wherein the sound damping pad may be located within the first chamber or outside the first chamber.

As a further improvement of the technology, the silencing pad is arranged inside the silencing cover and at least attached to the inner wall surface of the silencing cover and the outer wall surface of the fan; or the silencing pad is arranged outside the silencing cover and at least attached to the outer wall surface of the silencing cover and the inner wall surface of the fan cover.

As a further improvement of the technology, the silencing cover is made of flame-retardant ABS.

As a further improvement of the present technique, the outer wall surface of the silencing pad is provided with at least one rib, which is substantially parallel to the axis of the silencing pad and which acts to reduce the friction area of the outer wall surface of the silencing pad.

As a further improvement of the present technology, the silencing pad is a hollow shape, and specifically includes: the outer diameter of the two ends of the silencing pad is the same as the inner diameter of the two ends of the silencing pad, the silencing pad is of a straight pipe structure, and manufacturing is facilitated.

As a further improvement of the technology, the outer diameter of the bottom end part of the silencing pad is the same as that of the top end part of the silencing pad, and the inner diameter of the bottom end part of the silencing pad can be smaller than that of the top end part of the silencing pad.

In particular, the axial hole groove is of a through hole structure. Because the bottom end of the silencing pad is abutted against one end of the fan, a closed end of the axial hole groove (1/4 wave length tube) is formed at the bottom end of the silencing pad, and when sound waves enter the closed end, the closed end can be reached, so that reflection and wave attenuation are realized. Compare in prior art will axial hole groove bottom designs for enclosed construction, and the amortization pad structure of this application makes more portably, the cost is lower, and the manufacturability is also better, has also saved fan guard inner space simultaneously greatly.

The present application also contemplates a cleaning apparatus that includes at least a floor brush assembly, a dirt collection tank and a recovery duct, and a fan guard assembly as previously described.

As a further improvement of the present technology, the fan guard assembly and the cleaning device may be such that when the fan is activated to generate a negative pressure, dirt collected by the floor brush assembly is sucked into a dirt collection tank through the recovery duct, wherein an air flow is discharged through the dirt collection tank to an air inlet of the fan, passes through the cavity and is finally discharged to the outside.

Particularly, when the airflow enters the cavity, sound waves enter the axial hole groove (1/4 wave pipe) and then are reflected, so that at least part of the sound waves are offset, the peak frequency of noise can be reduced, and the aims of silencing and reducing noise are fulfilled. Furthermore, after the sound waves enter the axial hole groove, because a circumferential hole groove (1/4 wave length pipe) is also formed in the groove wall of the axial hole groove, part of the sound waves enter the circumferential hole groove and are reflected, so that at least part of sound wave frequency is further counteracted at the position, and the noise level is greatly reduced.

For a 1/4 wavelength tube structure, which is a tube cavity or channel with one end open and the other end closed, the incident wave is reflected at the closed end of the tube cavity and then overlaps itself to form a standing wave. At the closed end of the tube cavity, incident waves and reflected waves have a phase difference of 180 degrees, so that wave nodes are formed; at the open end, the air molecules vibrate most, and thus an antinode is formed. Thus, the length of the lumen should be 1/4 of the wavelength of the acoustic wave corresponding to the resonant frequency.

Particularly, after the noise sound wave with a certain frequency enters the 1/4 wavelength tube with the corresponding length L, the noise sound wave is reflected at the tube bottom of the 1/4 wavelength tube to generate the reflected sound wave with the same frequency and opposite amplitude, and the reflected sound wave and the noise in the original frequency band are mutually neutralized to reduce the noise in the frequency band.

By adopting the technical scheme, the following beneficial effects can be realized:

1. this application amortization pad is cavity annular structure, and the one end butt of its bottom portion and fan, and this amortization pad is located in the cavity, and be located between amortization cover and the fan, perhaps between amortization cover and the fan cover, make full use of above-mentioned structure space for the structure is compacter, and amortization pad material chooses for use silica gel or rubber etc. to further improve the effect of shock attenuation amortization.

2. The utility model provides a 1/4 wavelength tube structure that the amortization pad is equipped with along the multiple hole depth of axis direction extension from top portion can increase the range of making an uproar of falling to different noise peak frequencies, reduces multiple noise peak frequency, improves the noise reduction effect.

3. On the basis of the axial hole groove, the circumferential hole groove with various hole depths is arranged on the groove wall of the axial hole groove, and the circumferential hole groove is also of a 1/4 wavelength tube structure, so that part of sound waves entering the circumferential hole groove are reflected to cause the wave-shaped section to be neutralized, and the noise level is further reduced.

4. The 1/4 wavelength tube structure is typically a ring structure closed at one end so that sound waves are reflected at the closed end, and thus the prior art noise canceling pad is typically a U-shaped structure in its cross-section, with the bottom being closed. The bottom of the hollow annular silencing pad is not sealed, the axial hole groove of the hollow annular silencing pad is a straight-through hole, and the bottom end part of the hollow annular silencing pad is abutted to one end of the fan, so that the design of the sealed end of the silencing pad is avoided, the material cost is saved, the product manufacturability is improved, and the hollow annular silencing pad is convenient to manufacture.

Drawings

FIG. 1 is a schematic view of the exterior of a fan guard assembly.

FIG. 2 is a schematic view of an exploded view of a fan guard assembly.

FIG. 3 is a cross-sectional view of a fan guard assembly.

FIG. 4 is an isometric view of a silencer casing including axial bore slots.

Fig. 5-7 are multiple views of a sound-damping cap including an axial bore slot.

Fig. 8 is a cross-sectional view of the muffling enclosure including axial bore slots and circumferential bore slots.

Fig. 9 is an isometric view of a muffling enclosure comprising an axial bore slot and a circumferential bore slot.

Fig. 10 is a schematic view of the cleaning apparatus.

Number designation in the figures: 1. a fan guard assembly; 2. a sound-deadening pad; 2-1, an upper silencing pad; 2-2, a lower sound-absorbing pad; 3. a fan; 3-1, an air inlet; 3-2, an air outlet; 4. a sound deadening hood; 4-1, a first silencing cover; 4-2, a second silencing cover; 5. a fan guard; 5-1, a fan cover body; 5-2, covering the fan cover; 6. a cavity; 7. a first chamber; 8. a second chamber; 9. a first exhaust port; 10. a second vent hole; 11 air inlet sealing gasket; 12. a fan guard shock pad; 13. cleaning equipment; 14. a floor brush assembly; 15. a recovery pipeline; 16. a sewage collection tank; 17. a clear water tank; 18. a handle assembly; 19. an axial bore slot; 20. a circumferential hole groove; 21. and (4) ribs.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "including" and "having," as well as any variations thereof, in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As a specific embodiment of the present application, fig. 1 and 2 show an appearance schematic diagram and an explosion structural schematic diagram of a fan guard assembly, respectively.

The embodiment relates to a fan guard assembly 1, which comprises a fan 3, a silencing pad 2, a silencing cover 4 and a fan guard 5 which are sequentially arranged from inside to outside, wherein a cavity 6 is formed between the fan 3 and the fan guard 5, the silencing cover 4 is positioned in the cavity 6, a first cavity 7 is formed between the silencing cover 4 and the fan 3, the silencing pad 2 is a hollow annular structure with a bottom end part at least partially closed (for example, fig. 4-7 are hollow annular structures with a bottom end part at least partially closed), the silencing pad is arranged in the first cavity 7, the bottom end part of the silencing pad is abutted to one end of the fan 3, at least one axial hole groove along the axial direction of the silencing pad 2 is formed in the top end part of the silencing pad 2, the lower silencing pad 2-2 structure can be seen from fig. 4, the number of the hole grooves is 20, the axis of the silencing pad is taken as the center, and the hole grooves are distributed in a circumferential array on the top end part of the silencing pad.

As a preferred embodiment of the present application, the silencing pad 2 may have a hollow annular structure, and the inner wall surface of the silencing pad is formed in a through hole structure with a constant aperture, which can reduce the manufacturing difficulty and improve the manufacturability of the product. And fig. 4-7 show a structure comprising a sound-deadening pad partially closed at the bottom end, the outer diameter of the bottom end of the sound-deadening pad 2 being the same as that of the top end thereof, and the inner diameter of the bottom end thereof being smaller than that of the top end thereof.

In a preferred embodiment of the present application, the axial grooves 19 are formed in a 1/4 wavelength tube structure.

As a preferred embodiment of the present application, the depth of the axial bore groove 19 includes at least two kinds to correspond to at least two kinds of noise peak frequencies.

In a preferred embodiment of the present application, an included angle between the central axis of the axial hole groove 19 and the central axis of the sound-absorbing pad 2 is greater than or equal to 0, and an included angle between the central axis of the illustrated axial hole groove 19 and the central axis of the sound-absorbing pad 2 is 0.

As a preferred embodiment of the present application, at least one circumferential hole groove 20 is further provided on the groove wall of the axial hole groove 19 in the circumferential direction of the sound-absorbing pad 2 and/or in the circumferential tangential direction of the sound-absorbing pad 2, and referring to fig. 8 to 9, a plurality of circumferential hole grooves 20 of a certain depth are provided on the groove wall of the axial hole groove 19.

As a preferred embodiment of the present application, the circumferential groove 20 is also configured as a 1/4 wavelength tube structure.

As a preferred embodiment of the present application, the depth of the circumferential hole groove 20 includes at least two kinds to correspond to at least more noise peak frequencies.

As a preferred embodiment of the present application, an included angle between any two connecting lines on the central axis of the circumferential hole groove 20 and the bottom end surface of the sound-absorbing pad 2 is greater than or equal to 0, and an included angle between the central axis of the illustrated circumferential hole groove 20 and the bottom end surface of the sound-absorbing pad 2 is 0.

As a preferred embodiment of the present application, the outer wall surface of the silencing pad 2 is further provided with at least one rib 21, and the rib 21 is substantially parallel to the axis of the silencing pad 2 and is used for reducing the contact area of the outer wall surface of the silencing pad 2 so as to reduce the friction force.

In a preferred embodiment of the present application, the sound-deadening pad 2 is made of silicone, rubber or thermoplastic elastomer TPE, and the hardness thereof is preferably 35 to 40 degrees.

As a preferred embodiment of the present application, the silencing pad may be located in the first chamber, and an outer side wall of the silencing pad is substantially attached to an inner side wall of the silencing cover, and an inner side wall of the silencing pad is substantially attached to an outer side wall of the blower; or the first cavity is outside, the outer side wall of the silencing pad is basically attached to the inner side wall of the fan cover, and the inner side wall of the silencing pad is basically attached to the outer side wall of the silencing cover. Because the contact surface of the silencing pad has no gap, a more compact silencing structure is formed.

As a preferred embodiment of the present application, the sound-deadening pad 2 is further provided in the first chamber 7, and the bottom end portion thereof abuts against the other end of the fan 3.

As a preferred embodiment of the present application, another sound-deadening pad 2, namely, an upper sound-deadening pad 2-1 (see fig. 2) is further included, and a bottom end portion thereof abuts against the other end of the blower 3, wherein the upper sound-deadening pad 2-1 may be located inside the first chamber 7 or outside the first chamber 7.

As a preferred embodiment of the present application, the silencing pad 2 is disposed inside the silencing cover 4 and is attached to at least an inner wall surface of the silencing cover 4 and an outer wall surface of the fan 3; or the silencing pad 2 is arranged outside the silencing cover 4 and at least attached to the outer wall surface of the silencing cover 4 and the inner wall surface of the fan cover 5.

In a preferred embodiment of the present application, the sound-deadening cap 2 is made of flame-retardant ABS.

The length of the 1/4 wave tube is matched with the frequency and the sound velocity of noise to be reduced, and the specific details are shown in the following formula:

L＝c/4f _c

wherein L is the length of 1/4 wave tube, c is sound velocity, f _c The frequency of the adjustment of the noise. Wherein the adjustment frequency is determined based on the actual noise spectrum characteristics of the product.

Experiments prove that the sound pressure level between the frequencies of 1K and 3K is the highest and reaches or even exceeds 60dB, and the main peak frequency is between 1K and 3K. The range interval of the 1/4 wavelength tube length obtained by the above formula calculation based on the above frequency interval was (28.3, 85.0) mm. It can be seen that the length of the wavelength tube in this interval can be used to reduce noise for sound waves with frequencies in the (1k, 3k) Hz range. And specifically, according to experimental conditions and fan guard structure size, 1/4 wavelength pipe length is selected for use in this applicationThe degree is 32mm, and the above formula is also adopted for verification: f. of _c = c/4l = 340/(4 × 0.032) =2656.25Hz, and the frequency value falls within the above frequency range, so that acoustic noise reduction at that frequency can be achieved.

In particular, for other sonic frequencies outside the (1K, 3K) Hz range, the sonic frequency peaks of the corresponding range can be reduced as well when the 1/4 wavelength tube length is satisfying the above formula. Therefore, whether the axial hole groove or the 1/4 wave length pipe formed by the circumferential hole groove is adopted, the hole groove depth can be designed based on the formula and can be subjected to adaptive size design under a specific frequency interval, and the detailed description is omitted. Finally, the noise level can be reduced by 2-3 decibels compared with a fan cover without the silencing pad structure.

As a preferred embodiment of the present technology, the above structure can make the dirt collected by the floor brush assembly 14 sucked into the dirt collection box 16 through the recycling pipe 15 when the fan 3 is activated to generate negative pressure, wherein the airflow is discharged to the air inlet 3-1 of the fan through the dirt collection box 16, passes through the cavity 6 and finally is discharged to the outside. When the air flow enters the cavity 6, the sound waves are reflected after passing through the axial hole grooves 19 and the circumferential hole grooves 20 (1/4 wavelength tubes), so that at least part of the sound waves are offset, the peak frequency of noise can be reduced, and the purposes of noise reduction and noise reduction are achieved.

As a preferred embodiment of the present technology, the sound-deadening cap 4 includes a first sound-deadening cap 4-1 and a second sound-deadening cap 4-2 which are integrally formed or connected to each other, the second sound-deadening cap 4-2 is located on an outer wall surface of the first sound-deadening cap 4-1, and is surrounded with at least a part of the outer wall surface of the first sound-deadening cap 4-1 to form a second chamber 8 one side of which is communicated with the outside; the outer wall surface of the first silencing cover 4-1 comprises a first exhaust hole 9, and the outer wall surface of the second silencing cover 4-2 comprises a second exhaust hole 10, so that airflow enters from the air inlet 3-1 and is exhausted from the air outlet 3-2 to the first cavity 7, then enters the second cavity 8 through the first exhaust hole 9 and the second exhaust hole 10 in sequence, and finally is exhausted to the outside.

The gas flow path of the scheme at the fan guard assembly is as follows (see the attached figures 2-3 in the specification): after the fan 3 is started, negative pressure is generated at fan blades, so that gas is sucked into the fan 3 through the air inlet gasket 11 at the position of the bottom air inlet 3-1, the gas enters from the bottom air inlet 3-1 and is discharged from the side air outlet 3-2 into the first chamber 7 formed by the muffling cover 4 and the fan 3, the gas is discharged out of the first chamber 7 through the first gas discharge hole 9 because the peripheral surface of the first muffling cover 4-1 is provided with the first gas discharge hole 9 for gas circulation, and the gas immediately enters the second chamber 8 surrounded by the second muffling cover 4-2 through the second gas discharge hole 10 because the side wall surfaces at two ends of the second muffling cover 4-2 are provided with the second gas discharge holes 10, and finally is discharged out of the second chamber 8.

As a preferred embodiment of the present application, fig. 10 is a schematic view showing the overall structure of the cleaning device. The cleaning device generally comprises a floor brush assembly 14, a recovery duct 15, a dirt collection tank 16, a clean water tank 17, a handle assembly 18, and a fan guard assembly 1 as described above.

The gas flow path for the cleaning device of this solution is as follows: the scrubbing brush assembly 14 collects dirt on a surface to be cleaned, the dirt in a gas state or a liquid state is sucked to the dirt collection tank 16 through the recovery pipeline 15 to be stored under the condition that the fan cover assembly generates negative pressure, and suction gas enters the bottom air inlet 3-1 of the fan cover assembly from the dirt collection tank 16 and finally is discharged from the second chamber after passing through a cavity flow channel in the fan cover assembly (the process is explained in detail before, and is not repeated here).

Therefore, by adopting the cleaning equipment of the embodiment, under the condition that the cleaning performance is not reduced, the noise level can be greatly reduced by additionally arranging the silencing pad with the 1/4 wave pipe, particularly, the sound wave vibration buffering is realized by adding the silica gel elastic material and prolonging the path of a gas flow channel in the fan cover component, the noise reduction during the working period of the cleaning equipment can be realized, and the noise reduction device has substantial characteristics and progress.

As a preferred embodiment of the scheme, the cleaning equipment is a mopping machine or a floor washing machine and is mainly used for cleaning dirty surfaces such as floors, floors and carpets.

The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims (10)

1. A fan cover assembly comprises a fan, a silencing pad, a silencing cover and a fan cover, wherein a cavity is formed between the fan and the fan cover, and the silencing cover and the silencing pad are both positioned in the cavity.

2. The fan guard assembly of claim 1, wherein the axial slots are configured as a 1/4 wavelength tube structure.

3. The fan guard assembly of claim 1, wherein the at least one axial slot is distributed in a circumferential array on the end face of the noise dampening pad at the top end of the noise dampening pad centered about the noise dampening pad axis.

4. The fan guard assembly of claim 1, wherein the axial bore slot depths comprise at least two to correspond to at least two noise peak frequencies.

5. The fan guard assembly of claim 1, wherein an angle between a central axis of the axial bore slot and a central axis of the noise dampening pad is greater than or equal to 0.

6. The fan guard assembly of claim 1, wherein the axial bore slot is a through bore structure through the top and bottom ends of the noise dampening pad.

7. The fan guard assembly of any of claims 1-6, further comprising at least one circumferential hole groove in a circumferential direction of the noise damping pad and/or in a circumferential tangential direction of the noise damping pad on a groove wall of the axial hole groove.

8. The fan guard assembly of claim 7, wherein the circumferential hole groove is configured as a 1/4 wavelength tube structure.

9. The fan guard assembly of claim 7, wherein the circumferential groove depth comprises at least two to correspond to at least two noise peak frequencies.

10. A cleaning appliance comprising at least a floor brush assembly, a dirt collection tank and a recovery duct, and a fan guard assembly according to any preceding claim.

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