CN214887929U

CN214887929U - Machine and air conditioning system in spiral case, new trend power component, air conditioning

Info

Publication number: CN214887929U
Application number: CN202121182944.7U
Authority: CN
Inventors: 单联瑜
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd; Xiaomi Technology Wuhan Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-11-26
Anticipated expiration: 2031-05-28

Abstract

The utility model discloses a machine and air conditioning system in spiral case, new trend power component, air conditioning. The fresh air power assembly comprises a volute, a centrifugal fan and a noise reduction unit; the volute comprises a volute tongue, a first wall plate, a second wall plate, a first side wall and a second side wall, wherein the first wall plate and the second wall plate are oppositely arranged at two ends of the volute tongue at intervals; the centrifugal fan is arranged in the volute and used for generating fresh air flow; the noise reduction unit comprises a noise reduction hole and a noise reduction cavity communicated with the noise reduction hole, the noise reduction hole is formed in the first wall plate and/or the second wall plate, and the noise reduction cavity is communicated with the air outlet channel through the noise reduction hole. This new trend power component, air conditioning indoor set and air conditioning system utilize the spiral case after the improvement, noise when can reducing the new trend and supply with is favorable to improving user experience.

Description

Machine and air conditioning system in spiral case, new trend power component, air conditioning

Technical Field

The disclosure relates to the technical field of electronic equipment, in particular to a volute, a fresh air power assembly, an air conditioner indoor unit and an air conditioning system.

Background

At present, along with the improvement of production level, people have stronger and stronger requirements on healthy air in relatively closed spaces such as rooms. Therefore, people often use a fresh air system to replace indoor air so as to improve the indoor air quality.

But the noise is great when new trend power component operation of traditional air conditioning indoor set, is unfavorable for improving user experience.

SUMMERY OF THE UTILITY MODEL

The utility model provides a machine and air conditioning system in spiral case, new trend power component, air conditioning can reduce the noise when new trend supplies with, is favorable to improving user experience.

The technical scheme is as follows:

according to a first aspect of embodiments of the present disclosure, there is provided a volute comprising a volute tongue, a first wall plate, a second wall plate, a first side wall, a second side wall, and a noise reduction unit; the first wall plate and the second wall plate are oppositely arranged at two ends of the volute tongue at intervals, the first side wall is connected with the volute tongue, the second side wall is oppositely arranged with the first side wall, and an air outlet channel is formed by the second side wall, the volute tongue, the first wall plate, the second wall plate and the first side wall in a surrounding mode; the noise reduction unit comprises a noise reduction hole and a noise reduction cavity communicated with the noise reduction hole, the noise reduction hole is formed in the first wall plate and/or the second wall plate, and the noise reduction cavity is communicated with the air outlet channel through the noise reduction hole.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

when the volute is applied to a fresh air power assembly, the centrifugal fan operates, so that fresh air flow is generated in the volute and is sent out to the outside of the volute through the air outlet channel. At the moment, through the noise reduction unit arranged on the air outlet channel, when the air flow in the air outlet channel passes through the silencing hole, the air flow enters the silencing cavity through the silencing hole, resonance friction occurs, the silencing purpose is further achieved, and the vortex noise generated when the air outlet of the fresh air power assembly is favorably reduced. In addition, the noise reduction unit is arranged on the first wallboard and/or the second wallboard, so that the noise frequency of the fresh air power assembly can be effectively matched, and the effect of reducing noise of fresh air is favorably improved.

According to a second aspect of the embodiments of the present disclosure, there is provided a new wind power assembly, comprising a volute, a centrifugal fan and a noise reduction unit; the volute comprises a volute tongue, a first wall plate, a second wall plate, a first side wall and a second side wall, wherein the first wall plate and the second wall plate are oppositely arranged at two ends of the volute tongue at intervals; the centrifugal fan is arranged in the volute and used for generating fresh air flow; the noise reduction unit comprises a noise reduction hole and a noise reduction cavity communicated with the noise reduction hole, the noise reduction hole is formed in the first wall plate and/or the second wall plate, and the noise reduction cavity is communicated with the air outlet channel through the noise reduction hole.

when the fresh air power assembly is used, the centrifugal fan operates, so that fresh air flow is generated in the volute and is sent out to the outside of the volute through the air outlet channel. At this moment, through the noise reduction unit who sets up on the air-out passageway, when the air current in the air-out passageway passes through the bloop, the air current passes through the bloop and gets into the bloop chamber, and takes place the resonance friction, and then reaches the noise elimination purpose, the vortex noise that produces when being favorable to having reduced the air-out of new trend power component, and then can reduce the noise of the new trend operation of air conditioning indoor set, provide a good air circumstance and low noise environment for people's indoor life, improve user experience.

According to the third aspect of the embodiment of the present disclosure, an air-conditioning indoor unit is further provided, which includes a casing and a fresh air power assembly, wherein the fresh air power assembly is disposed on the casing.

when this machine starts new trend function in the air conditioning, centrifugal fan operates, and then produces new trend air current in the spiral case to send out new trend air current to the outside of spiral case through the air-out passageway, and then can carry new trend air (like outdoor air, or other oxygen content air better) to indoor, in order to improve the indoor air quality. At this moment, through the noise reduction unit who sets up on the air-out passageway, when the air current in the air-out passageway passes through the bloop, the air current passes through the bloop and gets into the bloop chamber, and takes place the resonance friction, and then reaches the noise elimination purpose, the vortex noise that produces when being favorable to having reduced the air-out of new trend power component, and then can reduce the noise of the new trend operation of air conditioning indoor set, provide a good air circumstance and low noise environment for people's indoor life, improve user experience.

According to a fourth aspect of the embodiments of the present disclosure, an air conditioning system is further provided, which includes the air conditioning indoor unit.

when the air conditioning system is used, the fresh air power assembly on the air conditioning indoor unit operates, the noise reduction unit can be utilized to reduce air outlet noise, the noise of fresh air operation of the air conditioning indoor unit can be reduced, meanwhile, the requirement of indoor fresh air ventilation of people is met, and the improvement of user experience is facilitated.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Brief description of the drawingsthe accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not intended to limit the disclosure.

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural view of an air conditioning indoor unit shown in an embodiment.

Fig. 2 is a schematic view of an internal structure of the air conditioning indoor unit shown in fig. 1.

Fig. 3 is an exploded view of the new aerodynamic assembly shown in fig. 2.

Fig. 4 is a schematic front view of a partial structure of the fresh air power assembly shown in fig. 3.

Fig. 5 is a schematic partial cross-sectional view of a fresh air power assembly shown in an embodiment.

Fig. 6 is a schematic diagram illustrating structural parameters of the fresh air power assembly shown in fig. 4.

Description of reference numerals:

10. an air-conditioning indoor unit; 100. a housing; 200. a fresh air power component; 210. a volute; 211. a volute tongue; 212. a first wall panel; 213. a second wall panel; 214. a first side wall; 215. a second side wall; 216. an air outlet channel; 217. an accommodating chamber; 218. an air inlet; 220. a centrifugal fan; 221. a blade; 230. a noise reduction unit; 231. a silencing hole; 232. a sound-deadening chamber; 240. a filter assembly.

Detailed Description

For the purpose of making the purpose, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

The air conditioning system is used as indoor temperature adjusting equipment, occupies an increasingly important position in the life of people, and brings healthy air for the life of people. The air conditioning systems are various in types and brands at present, so that consumers can select a large number of air conditioning systems, how to obtain the favor of the consumers is achieved, the product competitiveness is improved, and the problem that air conditioning system manufacturers attach more and more importance is solved.

Currently, an air conditioning system comprises an air conditioning indoor unit, and a fresh air power assembly is arranged in part of the air conditioning indoor unit so as to be convenient for exchanging with outdoor air and improving the indoor air quality. But the noise is great when the new trend power component operation of traditional air conditioning indoor set for indoor noise grow and influence people at indoor study, work, rest etc. is unfavorable for improving user experience.

Based on this, this disclosure provides a spiral case, be applied to in the new trend power component, can reduce the noise when new trend power component moves, and then be favorable to reducing the indoor noise, provide a good air circumstance and low noise environment for people's indoor life, improve user experience.

For a better understanding of the volute of the present disclosure, an air conditioning indoor unit to which the volute of the present disclosure is applied will be illustrated and described below with reference to the accompanying drawings. Fig. 1 to 6 show structural views of an air conditioning indoor unit and a fresh air power assembly thereof in some embodiments. Fig. 1 is a schematic structural diagram of an air conditioning indoor unit shown in an embodiment. Fig. 2 is a schematic view of an internal structure of the air conditioning indoor unit shown in fig. 1. Fig. 3 is an exploded view of the new aerodynamic assembly shown in fig. 2. Fig. 4 is a schematic front view of a partial structure of the fresh air power assembly shown in fig. 3. Fig. 5 is a schematic partial cross-sectional view of a fresh air power assembly shown in an embodiment. Fig. 6 is a schematic diagram illustrating structural parameters of the fresh air power assembly shown in fig. 4.

In an embodiment of the present disclosure, as shown in fig. 1 to 2, an air conditioning indoor unit 10 is provided, which includes a casing and a fresh air power assembly 200, where the fresh air power assembly 200 is disposed on the casing.

As shown in fig. 3 to 5, the fresh air power assembly 200 includes a volute 210, a centrifugal fan 220, and a noise reduction unit 230; the volute 210 comprises a volute tongue 211, a first wall plate 212, a second wall plate 213, a first side wall 214 and a second side wall 215, wherein the first wall plate 212 and the second wall plate 213 are oppositely arranged at two ends of the volute tongue 211 at intervals, the first side wall 214 is connected with the volute tongue 211, the second side wall 215 is oppositely arranged with the first side wall 214, and the second side wall 215, the volute tongue 211, the first wall plate 212, the second wall plate 213 and the first side wall 214 enclose to form an air outlet channel 216; the centrifugal fan 220 is arranged in the volute 210 and used for generating fresh air flow; the noise reduction unit 230 includes a sound-deadening hole 231 and a sound-deadening chamber 232 communicating with the sound-deadening hole 231, the sound-deadening hole 231 is disposed on the first wall plate 212 and/or the second wall plate 213, and the sound-deadening chamber 232 communicates with the air outlet passage 216 through the sound-deadening hole 231.

Thus, when the air-conditioning indoor unit 10 starts the fresh air function, the centrifugal fan 220 operates to generate a fresh air flow in the volute 210, and the fresh air flow is sent out to the outside of the volute 210 through the air outlet channel 216, so that fresh air (such as outdoor air or air with better oxygen content) can be conveyed to the indoor space, and the indoor air quality can be improved. At this moment, through the noise reduction unit 230 that sets up on air-out passageway 216, when the air current in air-out passageway 216 passes through the bloop 231, the air current passes through bloop 231 and gets into bloop 232, and take place the resonance friction, and then reach the noise elimination purpose, the vortex noise that produces when being favorable to having reduced the air-out of new trend power component 200, and then can reduce the noise of the new trend operation of air conditioning indoor set 10, provide a good air circumstance and low noise environment for people's indoor life, improve user experience.

In addition, noise reduction unit 230 sets up on first wallboard 212 and/or second wallboard 213, can effectively match the noise frequency of new trend power component 200, is favorable to improving the effect of making an uproar falls in the new trend. Because the noise of the air-conditioning indoor unit 10 is low during fresh air supply, the air-conditioning indoor unit is beneficial to improving the air intake of the fresh air power assembly 200, so as to better meet the requirement of people on fresh air volume in indoor life or work, and can meet the requirement of 30m per person³The fresh air requirement is/h.

The centrifugal fan includes an axial flow fan and the like.

It should be noted that the "first wall plate" may be a "part of the scroll casing", that is, the "first wall plate" is integrally formed with "other parts of the scroll casing, such as the second wall plate"; the first wall plate can be manufactured separately from the other parts of the volute, such as the second wall plate, and then the first wall plate and the other parts of the volute, such as the second wall plate, are combined into a whole.

Equivalently, a "certain side wall" may be a part of a corresponding "component", i.e., "a body", "a part", and other parts of the "component" are integrally formed and manufactured; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expression "a certain body" or "a certain portion" in the present disclosure is only one example, and is not intended to limit the scope of the present disclosure, so long as the above features are included and the same function is understood to be equivalent to the present disclosure.

The concrete implementation mode of the silencing cavity can be various, such as that a cover body is covered on the outer side of the first wall plate and/or the second wall plate; or a cavity is formed on the outer side wall of the first wall plate and/or the second wall plate in the direct volute manufacturing process.

The sound-absorbing hole can be formed by directly arranging the first wall plate and/or the second wall plate, or can be formed by embedding a sound-absorbing pipe or a pipeline on the first wall plate and/or the second wall plate.

That is, the "noise reduction unit" may be one of the components of the "volute", that is, assembled with the "other components of the volute" into one module, and then modularly assembled; the volute can be relatively independent from other components of the volute and can be respectively installed, and the volute can be combined with other components of the protective shell in the fresh wind power assembly.

Equivalently, the components of the air-conditioning indoor unit and the air-conditioning system can be flexibly combined, namely, the components can be produced in a modularized mode according to the actual situation and can be assembled in a modularized mode as an independent module; the modules may be assembled separately, and one module may be constructed in the present apparatus. The division of the above-mentioned components in the present disclosure is only one embodiment, which is convenient for reading and not limiting the scope of protection of the present disclosure, and the technical solutions equivalent to the present disclosure should be understood as if they are included and the functions are the same.

As shown in fig. 3 and 4, in some embodiments, the volute 210 further includes an accommodating chamber 217 for accommodating the centrifugal fan 220, the accommodating chamber 217 is provided with an air inlet, and a filter assembly 240 is disposed between the air inlet and the centrifugal fan 220. Thus, the centrifugal fan 220 can be disposed in the volute 210 through the accommodating cavity 217, and fresh air entering the volute 210 can be filtered by the filter assembly 240, so that cleaner fresh air can be provided for a user.

In some embodiments, as shown in FIG. 3, the volute 210 is assembled from multiple shells. Thus, the centrifugal fan 220, the filter assembly 240 and other components are conveniently arranged in the volute 210, and the later maintenance is also convenient.

Particular embodiments of the filter assembly include, but are not limited to, at least one of filter cotton, filter mesh, and the like.

In addition to any of the above embodiments, referring to fig. 3 to 5, in an embodiment, the muffling holes 231 include a plurality of holes, and are disposed on the first wall plate 212 and the second wall plate 213 at regular intervals. Thus, the spaces of the first wall plate 212 and the second wall plate 213 can be fully utilized to provide the plurality of muffling holes 231, so that the muffling cavity 232 and the plurality of muffling holes 231 cooperate to form a helmholtz resonance structure. When the frequency of the noise generated by the fresh air power assembly 200 is consistent with the resonance frequency of the helmholtz resonance structure, the air in the silencing cavity 232 generates violent vibration friction, so that the absorption effect is enhanced, the sound energy is obviously attenuated, the reliable denoising effect is achieved, the silencing and denoising effects are favorably improved, and the noise of the fresh air operation of the indoor unit 10 of the air conditioner is further reduced.

Optionally, in an embodiment, the diameter of the muffling hole is D; wherein D is more than or equal to 1mm and less than or equal to 5 mm. So, can set up more and more even bloop according to the area size of first wallboard and second wallboard.

In some embodiments, D is one of 1mm, 2mm, 3mm, 4mm, 5mm, and the like.

Optionally, in an embodiment, the distance between two adjacent silencing holes is L1; wherein L is more than or equal to 3mm and less than or equal to 20 mm. So, can set up the amortization hole according to the new trend supply size of air conditioning indoor set, the nimble area size according to first wallboard and second wallboard to satisfy the amortization requirement of making an uproar that falls.

In some embodiments, L1 is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and the like.

Optionally, in an embodiment, the depth of the sound-deadening hole is H1; wherein H1 is more than or equal to 1mm and less than or equal to 3 mm. So, can be satisfying under the operating stability's of machine in the air conditioning the condition, according to the new trend supply size of machine in the air conditioning, the wall thickness that can adjust first wallboard and second wallboard sets up the amortization hole to satisfy the amortization requirement of making an uproar of falling.

In some embodiments, H1 is one of 1mm, 2mm, 3mm, and the like.

In addition to any of the above embodiments, as shown in fig. 5, in one embodiment, the depth of sound-deadening chamber 232 is H2; wherein H2 is more than or equal to 3mm and less than or equal to 10 mm. Thus, the depth of the muffling cavity 232 can be reasonably selected according to the fresh air supply size of the air-conditioning indoor unit 10 under the condition of meeting the miniaturization design of the air-conditioning indoor unit 10, so as to meet the requirements of noise reduction and muffling.

In some embodiments, H2 is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and the like.

In the implementation, the diameter of each sound-deadening hole is D, the distance between every two adjacent sound-deadening holes is L1, the depth of each sound-deadening hole is H1, and the depth of each sound-deadening cavity is H2; wherein D is more than or equal to 1mm and less than or equal to 5mm, L is more than or equal to 3mm and less than or equal to 20mm, H1 is more than or equal to 1mm and less than or equal to 3mm, and H2 is more than or equal to 3mm and less than or equal to 10 mm. So for the amortization hole constitutes a more excellent helmholtz resonance structure with the amortization chamber, and the air current takes place the resonance friction with helmholtz resonance structure, and then reaches the noise elimination purpose, has reduced export vortex noise, reaches the effect that reduces the export noise, can promote new trend power component's air output simultaneously, has promoted new trend power component's performance.

In an embodiment, based on any of the above embodiments, the radius of the volute tongue 211 is R; wherein R is more than or equal to 5mm and less than or equal to 10 mm. Therefore, the size of the volute tongue 211 can be guaranteed to be within a reasonable range, airflow backflow at the volute tongue 211 can be reduced, the backflow range is further reduced, and eddy noise generated at the air outlet of the fresh air power assembly 200 is reduced.

In some embodiments, R is one of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and the like.

On the basis of any of the above embodiments, as shown in fig. 6, in an embodiment, on the orthographic projection surface of the volute tongue 211, the included angle between the volute tongue 211 and the horizontal line is α; wherein alpha is more than or equal to 30 degrees and less than or equal to 60 degrees. Therefore, the buffering distance from the blade 221 of the centrifugal fan 220 to the outlet can be ensured, the turbulence phenomenon is reduced, the rapid gas discharge is facilitated, the backflow range is further reduced, and the eddy noise is reduced.

In some embodiments, a is one of 30 °, 45 °, 60 °, etc.

In addition to any of the above embodiments, as shown in fig. 6, in one embodiment, the minimum distance between the volute tongue 211 and the second sidewall 215 is L2; wherein A is less than or equal to L2 is less than or equal to 2A, and A is the opening degree of the volute 210. So for the air outlet of new trend power component 200 is enough big, is favorable to quick exhaust gas, with reduction backward flow scope, reduction vortex noise.

On the basis of any of the above embodiments, as shown in FIG. 3, in one embodiment, the centrifugal fan 220 includes blades 221, and the number of the blades 221 is n, where n is 43 ≦ n ≦ 51. Thus, the number of the blades 221 is reasonably designed, the occurrence of the turbulence phenomenon at the air outlet of the volute 210 is reduced, the smooth exhaust is realized, and the operation noise can be reduced.

In some embodiments, n is one of 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, etc.

In some embodiments, the radius of the volute tongue is R; on the orthographic projection surface of the volute tongue, the included angle between the volute tongue and the horizontal line is alpha; the minimum distance between the volute tongue and the second side wall is L2, and the number of the blades is n; wherein R is more than or equal to 5mm and less than or equal to 10mm, alpha is more than or equal to 30 degrees and less than or equal to 60 degrees, L2 is more than or equal to A and less than or equal to 2A, n is more than or equal to 43 and less than or equal to 51, and A is the opening degree of the volute. Thus, the position, the size and the number of the blades of the volute tongue are reasonably distributed; the amount of the vortex flow is reduced, the occurrence of the turbulence phenomenon at the air outlet of the volute is reduced, the quick exhaust of gas is facilitated, and then the backflow of airflow at the volute tongue is reduced and the rotation noise is reduced.

In addition to any of the above embodiments, as shown in fig. 5, in one embodiment, sound-deadening chamber 232 is provided on the outer side of first wall plate 212 and/or on the outer side of second wall plate 213. Therefore, the setting of the silencing cavity 232 does not occupy the space of the air outlet channel 216, and the smooth air outlet is ensured.

In some embodiments, an air conditioning system is further provided, including the indoor unit of an air conditioner in any of the above embodiments.

In some embodiments, the air conditioning system further comprises an air conditioning outdoor unit for supplying air to the air conditioning indoor unit. So, this air conditioning system can set up new trend air conditioner, can also improve outdoor air when can provide cooling air current or heating air current for the user to improve the indoor air oxygen content.

In the description of the present disclosure, it is to be understood that the terms "center," "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 disclosure and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present disclosure.

Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include at least one of the feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; 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 disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless otherwise expressly stated or limited, 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 an intermediate. 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.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show several embodiments of the present disclosure, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the concept of the present disclosure, and these changes and modifications are all within the scope of the present disclosure.

Claims

1. A spiral casing, comprising:

the volute tongue comprises a volute tongue, a first wall plate, a second wall plate, a first side wall and a second side wall, wherein the first wall plate and the second wall plate are oppositely arranged at two ends of the volute tongue at intervals, the first side wall is connected with the volute tongue, the second side wall is oppositely arranged with the first side wall, and an air outlet channel is formed by the second side wall, the volute tongue, the first wall plate, the second wall plate and the first side wall in a surrounding manner; and

the volute further comprises a noise reduction unit which comprises a silencing hole and a silencing cavity communicated with the silencing hole, the silencing hole is in one-to-one correspondence with the silencing cavity and is formed in the first wall plate and/or the second wall plate, and the silencing cavity is communicated with the air outlet channel through the silencing hole.

2. The spiral casing of claim 1 wherein the muffling hole comprises a plurality of holes and is disposed on the first wall plate and the second wall plate at regular intervals.

3. The spiral casing of claim 2 wherein the muffling hole has a diameter D; wherein D is more than or equal to 1mm and less than or equal to 5 mm.

4. The spiral casing of claim 2 wherein the spacing between two adjacent muffling holes is L; wherein L1 is more than or equal to 3mm and less than or equal to 20 mm.

5. The spiral casing of claim 2 wherein the depth of the muffling hole is H1; wherein H1 is more than or equal to 1mm and less than or equal to 3 mm.

6. The spiral casing of claim 1 wherein the muffling chamber has a depth of H2; wherein H2 is more than or equal to 3mm and less than or equal to 10 mm.

7. The spiral casing of claim 1 wherein the radius of the volute tongue is R; wherein R is more than or equal to 5mm and less than or equal to 10 mm.

8. The spiral casing of claim 1 wherein on an orthographic projection surface of the volute tongue, an angle between the volute tongue and a horizontal line is α; wherein alpha is more than or equal to 30 degrees and less than or equal to 60 degrees.

9. The spiral casing of claim 1 wherein the minimum spacing between the volute tongue and the second sidewall is L2; wherein, A is less than or equal to L2 and less than or equal to 2A, and A is the opening degree of the volute.

10. The spiral casing of any of claims 1 to 9 wherein the muffling chamber is disposed outside the first wall panel and/or outside the second wall panel.

11. A fresh air power assembly comprising a centrifugal fan and a volute of any of claims 1 to 10, the centrifugal fan being disposed within the volute for generating a fresh air flow.

12. The fresh air power assembly as recited in claim 11 wherein the centrifugal fan includes a number of blades n, wherein n is 43 ≦ n ≦ 51.

13. An indoor unit of an air conditioner, comprising a casing and the fresh air power assembly of claim 11 or 12, wherein the fresh air power assembly is disposed on the casing.

14. An air conditioning system characterized by comprising the indoor unit of air conditioner as set forth in claim 13.