CN219220759U - Centrifugal fan system and household appliance with same - Google Patents

Abstract

A centrifugal fan system comprising a volute having: the front cover plate is vertically arranged and is provided with an air inlet penetrating through the wall thickness; the rear cover plate is arranged opposite to the front cover plate at intervals; the annular wall is arranged between the front cover plate and the rear cover plate, and is provided with a first end part and a second end part which are opposite left and right, and the front cover plate and the rear cover plate together define an air outlet with an upward opening; the filter plate is provided with a filter hole penetrating through the plate thickness, is transversely arranged in the air outlet and is positioned between the first end part and the second end part of the annular wall, and ventilation gaps are reserved between the left side edge and the right side edge of the filter plate and the first end part and the second end part of the corresponding annular wall. The application also discloses a household appliance with the system. Compared with the prior art, the air purification device has an air purification function, and can reduce wind resistance.

Description

Centrifugal fan system and household appliance with same

Technical Field

The utility model belongs to the technical field of household appliances, and particularly relates to a centrifugal fan system and a household appliance with the same.

Background

The structure disclosed in the present centrifugal fan system for household appliances, such as the utility model patent application for air purifier and air purifier with application number CN202010507419.1 (application publication number CN113757138 a), the fan system comprises a backward centrifugal fan and a volute, the volute has a front cover plate, a rear cover plate and a volute coaming connected between the front cover plate and the rear cover plate, the front cover plate is provided with an air inlet, and the top of the front cover plate, the rear cover plate and the volute coaming enclose an air outlet; the backward centrifugal fan can be eccentrically arranged in the volute in a rotating way, an air inlet of the backward centrifugal fan is arranged corresponding to an air inlet of the volute, and two sides of the coaming of the volute are respectively recessed inwards at positions close to the upper end to form a volute tongue capable of boosting and guiding air outlet.

The structure disclosed in patent No. ZL202121479095.1 (grant publication No. CN 215523652U) includes a housing, a backward centrifugal fan disposed in the housing, and a volute casing connected between the front cover plate and the back cover plate, wherein the backward centrifugal fan is rotatably and eccentrically disposed in the volute casing, a fresh air inlet is opened at the lower part of the rear side wall of the housing, an air outlet is opened at the top, an air inlet disposed near the fresh air inlet is opened at the back cover plate, an air outlet is enclosed by the top of the front cover plate, the back cover plate and the volute casing, and the air inlet of the backward centrifugal fan is disposed backward and corresponding to the air inlet.

The existing centrifugal fan system in the household appliance is mainly used for sucking external air flow into the shell of the household appliance and then discharging the air flow out of the shell. When the air flow sucked into the housing needs to be purified, the purification module is generally arranged outside the centrifugal fan system, and when the purification module is arranged in the housing and is positioned outside the centrifugal fan system, a part of the volume of the housing is occupied, so that the volume of the housing is increased. If the purification module is arranged in the centrifugal fan system, larger resistance can be generated to air flow in the volute, so that the normal operation of the centrifugal fan system is affected.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide a centrifugal fan system with an air purifying function and capable of reducing wind resistance aiming at the current state of the art.

The second technical problem to be solved by the utility model is to provide a centrifugal fan system which is convenient to install to a household appliance so as to ensure the working efficiency of the centrifugal fan system at the same time.

The third technical problem to be solved by the utility model is to provide a household appliance with the centrifugal fan system.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a centrifugal fan system comprising:

a volute, the volute having:

the front cover plate is vertically arranged and is provided with an air inlet penetrating through the wall thickness;

the rear cover plate is arranged opposite to the front cover plate at intervals;

the annular wall is arranged between the front cover plate and the rear cover plate, and is provided with a first end part and a second end part which are opposite left and right, and an air outlet with an upward opening is jointly defined by the annular wall, the front cover plate and the rear cover plate;

the centrifugal fan system is characterized by further comprising:

the filter plate is provided with a filter hole penetrating through the plate thickness, is transversely arranged in the air outlet and is positioned between the first end part and the second end part of the annular wall, and ventilation gaps are reserved between the left side edge and the right side edge of the filter plate and the first end part and the second end part of the corresponding annular wall.

Preferably, the filter plate is located at a central position between the first and second ends of the annular wall.

Preferably, a volute tongue is formed at the second end of the annular wall, the volute tongue, the first end of the annular wall, the front cover plate and the rear cover plate jointly define the air outlet with the caliber gradually increasing from bottom to top, the spacing distance a between the left side edge of the filter plate and the first end of the annular wall is 60-70 mm, and the spacing distance b between the right side edge of the filter plate and the first end of the annular wall is 55-65 mm. Therefore, the resistance of the filter plate to the air duct is small while the air flow passing through the filter plate can be ensured.

Further, the filter plate also comprises an impeller which can be rotationally restrained in the volute around a rotation axis extending in the front-rear direction, and the vertical distance c between the bottom surface of the filter plate and the rotation axis of the impeller is 230-240 mm. When the vertical distance is smaller than the minimum value of the range, larger resistance is generated to the volute air duct; when the vertical distance is larger than the maximum value, the overall layout is affected, and the design height is changed.

Further, the rear cover plate is also provided with an air inlet penetrating through the plate thickness, the air inlets on the front cover plate and the rear cover plate are aligned, and the impeller is arranged to suck the external air flow into the volute from the air inlets of the front cover plate and the rear cover plate at the same time.

In the above embodiments, in order to further enhance the flow of wind passing through the filter plate, it is preferable that the front and rear sides of the filter plate are adjacent to or attached to the corresponding front and rear cover plates.

In order to better restrain the filter plate, it is preferable that the opposite plate surfaces of the front cover plate and the rear cover plate are respectively provided with a step surface, and the filter plate is supported on the step surfaces. The step surface can support the filter plate, and meanwhile, the filter plate is convenient to install, and the filter plate is placed on the step surface from top to bottom during installation.

In order to further restrain the filter plates, further, each step surface is further provided with two limiting pieces which are arranged at intervals left and right, and the interval distance between the two limiting pieces is arranged so that the filter plates can be restrained in the limiting pieces.

In order to further solve the second technical problem, preferably, the outer contour line of the annular wall forms a volute line, a vertical surface extending back and forth and passing through the leftmost end of the volute line is defined as a first vertical surface, and a vertical surface extending back and forth and passing through the rightmost end of the volute line is defined as a second vertical surface;

the centrifugal fan system also comprises two first mounting frames which are connected with at least one of the front cover plate, the rear cover plate and the annular wall of the volute, are arranged outside the volute, are respectively positioned at the left side and the right side of the air outlet, and are positioned between the first vertical surface and the second vertical surface; meanwhile, each first mounting frame is provided with a first connecting part which can be connected to the household appliance. So, when the setting of first mounting bracket makes things convenient for the spiral case to install domestic appliance, occupy less space again for the volume of spiral case can be enough big.

Preferably, each first mounting frame comprises a first front mounting plate and a first rear mounting plate which extend vertically, the two plates are opposite in plate surface interval and are respectively arranged on the front cover plate and the rear cover plate in a front-back mode, and the first front mounting plate and the first rear mounting plate are respectively provided with the first connecting part.

Preferably, the first mounting frame is located below the top edge of the air outlet.

More preferably, the vertical distance between the upper edges of the first front mounting plate and the first rear mounting plate and the top edge of the air outlet is 0-65 mm.

In the above scheme, in order to improve stability of the connection structure, preferably, the connection structure further comprises two second mounting frames, which are arranged below the annular wall in a left-right manner and between the first vertical surface and the second vertical surface, and each second mounting frame is provided with a second connection part capable of being connected to the household appliance.

Preferably, each second mounting frame comprises a second front mounting plate and a second rear mounting plate which extend vertically, the two plates are opposite in plate surface interval and are respectively connected with the front cover plate and the rear cover plate in a front-back mode, and the second front mounting plate and the second rear mounting plate are respectively provided with the second connecting parts.

Preferably, the vertical distance between the lower edges of the second front mounting plate and the second rear mounting plate and the lowest end of the volute molded line is 0-30 mm.

In order to reduce the risk of deformation of the mounting plates, preferably, the first mounting frame further comprises a first orthopedic screw for connecting the corners of the corresponding first front mounting plate and first rear mounting plate; the second mounting frame further comprises a second orthopedic screw which is connected with the corresponding corner parts of the second front mounting plate and the second rear mounting plate.

In order to ensure the orthopedic effect of the orthopedic screws, further, the radial distance between the first orthopedic screw and the corresponding annular wall and the radial distance between the second orthopedic screw and the corresponding annular wall are 35-70 mm.

In the above aspect, preferably, a vertical distance between a left edge of the first and second mounting frames located on the left side and the first vertical surface is 0 to 30mm, and a vertical distance between a right edge of the first and second mounting frames located on the right side and the second vertical surface is 0 to 30mm.

Further, the two first front mounting plates and the two second front mounting plates which are positioned on the front cover plate integrally form four square corners of a square; the shapes of the first rear mounting plate and the second rear mounting plate which are positioned on the rear cover plate are matched with the shapes of the corresponding first front mounting plate and the second front mounting plate.

Further, the front side plate surfaces of the first and second front mounting plates are flush with the front side plate surface of the front cover plate, and the rear side plate surfaces of the first and second rear mounting plates are flush with the rear side plate surface of the rear cover plate.

Preferably, the first connecting portion and the second connecting portion are threaded holes.

In each of the above solutions, preferably, the annular wall is formed by butting front and rear annular wall units, and the two annular wall units after butting are connected by screws, and at least two screws are arranged at intervals along the circumferential direction of the annular wall.

Preferably, the two annular wall units are also respectively provided with a buckle and a clamping hole, and the buckle is clamped with the clamping hole in the butt joint state of the two annular wall units.

Preferably, the abutment surfaces of the two annular wall units are mating stepped surfaces. Facilitating alignment between the two annular walls.

In the above solutions, preferably, one of the front cover plate and the rear cover plate is provided with a vertically extending wire slot, a notch of the wire slot is provided with at least two limiting tongues, the limiting tongues are arranged at intervals along the extending direction of the wire slot, and two adjacent limiting tongues are arranged in a left-right opposite manner.

In order to prevent the wire from being separated from the wire groove, preferably, the end of each limit tongue is provided with an anti-separation convex part protruding to the bottom of the wire groove.

The technical scheme adopted by the utility model for solving the third technical problem is as follows: a household appliance having a centrifugal fan system as described above.

The household appliance can be an electric appliance such as a range hood, an air purifier and a humidifier, which is provided with a centrifugal fan and needs to purify air, and preferably the household appliance is the air purifier and comprises a shell, wherein a cavity for installing a centrifugal fan system is arranged in the shell, an air inlet penetrating through the wall thickness is arranged at the position of the side wall of the shell corresponding to the air inlet of the volute, and an air outlet penetrating through the wall thickness is arranged at the position of the top wall of the shell corresponding to the air outlet of the volute.

Compared with the prior art, the utility model has the advantages that: the air flow passing through the air outlet can be filtered and purified by arranging the filter plate with the upward plate surface at the air outlet of the volute; meanwhile, because ventilation gaps are reserved between the left side edge and the right side edge of the filter plate and the first end part and the second end part of the corresponding annular wall, part of air flow can directly flow out from the ventilation gaps, so that the resistance of the filter plate to the air flow in the volute is reduced, and the normal operation of the fan is not influenced basically; and because the air outlet department of fan is located to the filter of this application for the filter plate need not to occupy the space in domestic appliance inside again.

Drawings

FIG. 1 is a schematic diagram of a centrifugal fan system in an embodiment of the utility model;

fig. 2 is a schematic structural view of a home appliance according to an embodiment of the present utility model;

fig. 3 is a sectional view (a section is a vertical plane extending in a front-rear direction) of a home appliance in an embodiment of the present utility model;

fig. 4 is a sectional view (a section is a vertical plane extending in a left-right direction) of a home appliance in an embodiment of the present utility model;

fig. 5 is an exploded perspective view of a home appliance in an embodiment of the present utility model;

FIG. 6 is a longitudinal cross-sectional view of a centrifugal fan system in an embodiment of the utility model;

FIG. 7 is a transverse cross-sectional view of a centrifugal fan system in an embodiment of the utility model;

fig. 8 is a schematic view of a partial structure of a home appliance (door panel omitted) according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 8, a centrifugal fan system including a scroll 100, a filter plate 140, and an impeller 150, which is a preferred embodiment of the present utility model, and a home appliance having the same.

The volute 100 is provided with a front cover plate 110, a rear cover plate 120 and an annular wall 130, wherein the front cover plate 110 is vertically arranged and provided with an air inlet 111 penetrating through the wall thickness; the rear cover plate 120 and the front cover plate 110 are arranged at opposite intervals, the rear cover plate 120 is also provided with an air inlet 111 penetrating through the plate thickness, and the air inlets 111 on the front cover plate and the rear cover plate are aligned; the annular wall 130 is disposed between the front cover plate 110 and the rear cover plate 120, and has a first end 131 and a second end 132 opposite to each other, and the front cover plate 110 and the rear cover plate 120 together define an air outlet 112 with an upward opening.

The impeller 150 is rotatably restrained in the scroll casing 100 about a rotation axis extending in the front-rear direction, and is arranged to suck the outside air flow into the scroll casing 100 from the air inlets 111 of the front and rear cover plates at the same time.

The filter plate 140 has a filter hole 141 penetrating through the plate thickness, and the filter plate 140 is transversely disposed in the air outlet 112 and is located at a central position between the first end 131 and the second end 132 of the annular wall 130, and ventilation gaps 142 are left and right sides of the filter plate 140 and the first end 131 and the second end 132 of the corresponding annular wall 130.

In this embodiment, a volute tongue 133 is formed at the second end 132 of the annular wall 130, the volute tongue 133 and the first end 131 of the annular wall 130 and the front and rear cover plates together define the air outlet with gradually increased caliber from bottom to top, the distance a between the left side edge of the filter plate 140 and the first end 131 of the annular wall 130 is 60-70 mm, and the distance b between the right side edge of the filter plate 140 and the first end 131 of the annular wall 130 is 55-65 mm. Meanwhile, the vertical distance c between the bottom surface of the filter plate 140 and the rotation axis of the impeller 150 is 230-240 mm.

In this embodiment, the front and rear sides of the filter plate 140 are adjacent to or attached to the corresponding front cover plate 110 and rear cover plate 120. In order to restrain the filter plate 140 in the air outlet 112, the opposite plate surfaces of the front cover plate 110 and the rear cover plate 120 are respectively provided with a step surface 121, each step surface 121 is further provided with two limiting pieces 122 which are arranged at intervals left and right, and the interval distance between the two limiting pieces 122 is arranged to restrain the filter plate 140 therein, so that the filter plate 140 is supported on the step surface 121 and restrained between the two limiting pieces 122.

Meanwhile, as shown in fig. 6 to 8, the outer contour line of the annular wall 130 forms a volute line, a vertical surface extending forward and backward and passing through the leftmost end of the volute line is defined as a first vertical surface 1a, and a vertical surface extending forward and backward and passing through the rightmost end of the volute line is defined as a second vertical surface 1b; the centrifugal fan system further comprises two first mounting frames 160 connected with at least one of the front cover plate 110, the rear cover plate 120 and the annular wall 130 of the volute 100, and arranged outside the volute 100, respectively positioned at the left side and the right side of the air outlet 112 and between the first vertical surface 1a and the second vertical surface 1b; meanwhile, each of the first mounting frames 160 is provided with a first connection portion 161 that can be connected to the home appliance. The centrifugal fan system further comprises two second mounting frames 170 arranged in a side-by-side manner under the annular wall 130 and between the first and second vertical surfaces 1a, 1b, each second mounting frame 170 being provided with a second connection 171 connectable to a household appliance.

The first and second mounting frames have the following structures: each first mounting frame 160 includes a first front mounting plate 162 and a first rear mounting plate 163 extending vertically, and the two plates are opposite to each other at intervals and are respectively disposed on the front cover plate 110 and the rear cover plate 120 in a front-to-back manner, and threaded holes are disposed on the first front mounting plate 162 and the first rear mounting plate 163 as the first connecting portion 161. And the first mounting frame 160 is located below the top edge of the air outlet 112. The vertical distance between the upper edges of the first front mounting plate 162 and the first rear mounting plate 163 and the top edge of the air outlet 112 is 0 to 65mm. Meanwhile, the first mounting frame 160 further includes a first orthopedic screw 164 connected to corners of the corresponding first front mounting plate 162 and first rear mounting plate 163. And the radial distance of the first orthopedic screw 164 from the corresponding annular wall 130 is 35-70 mm.

Each second mounting frame 170 includes a vertically extending second front mounting plate 172 and a second rear mounting plate 173, which are spaced apart and connected to the front and rear cover plates 110, 120, respectively, in a tandem manner. The second front mounting plate 172 and the second rear mounting plate 173 are each provided with a screw hole as the second connecting portion 171. The vertical distance between the lower edges of the second front mounting plate 172 and the second rear mounting plate 173 and the lowest end of the volute line is 0-30 mm. Meanwhile, the second mounting frame 170 further includes second orthopedic screws 174 connected to corners of the corresponding second front mounting plate 172 and second rear mounting plate 173. And the radial distance of the second orthopedic screw 174 from the corresponding annular wall 130 is 35-70 mm.

Meanwhile, in this embodiment, the vertical distance between the left edges of the first and second mounting frames located on the left side and the first vertical surface 1a is 0 to 30mm, and the vertical distance between the right edges of the first and second mounting frames located on the right side and the second vertical surface 1b is 0 to 30mm. The two first front mounting plates 162 and the two second front mounting plates 172 on the front cover plate 110 integrally form four square corners of a square; the first and second rear mounting plates 163, 173 on the rear cover plate 120 are shaped to match the corresponding first and second front mounting plates 162, 172. Meanwhile, the front side plate surfaces of the first and second front mounting plates are flush with the front side plate surface of the front cover plate 110, and the rear side plate surfaces of the first and second rear mounting plates are flush with the rear side plate surface of the rear cover plate 120.

Thus, the centrifugal fan system is convenient to install on household appliances through the setting of first, second mounting bracket. And the design of the structure and the position of the first mounting frame and the second mounting frame ensures that the centrifugal fan system can be stably restrained in the household appliance while occupying less space.

Meanwhile, the annular wall 130 of the volute in this embodiment is formed by butting two front and rear annular wall units 134, and the butting surfaces of the two annular wall units 134 are matched step surfaces. And the two abutted annular wall units 134 are connected by screws, and the screws are at least two and are circumferentially spaced along the annular wall 130. The two annular wall units 134 are also respectively provided with a buckle 135 and a clamping hole 136, and the buckle 135 is clamped with the clamping hole 136 in a butt joint state of the two annular wall units 134.

In order to facilitate the storage of the electric wires, one of the front cover plate 110 and the rear cover plate 120 is provided with a vertically extending wire slot 180, the notch of the wire slot 180 is provided with at least two limiting tongues 181, the limiting tongues 181 are arranged at intervals along the extending direction of the wire slot 180, and the two adjacent limiting tongues 181 are oppositely arranged left and right. The end of each limit tongue 181 is provided with an anti-drop protrusion 182 protruding toward the bottom of the slot 180. Thus, the electric wire can be inserted into the wire slot 180, and the design of the limit tongue 181 and the anti-drop protrusion 182 on the wire slot 180 can prevent the electric wire from being separated from the wire slot 180.

The household appliance of the embodiment is an air purifier, and comprises a housing, wherein a chamber for installing a centrifugal fan system is arranged in the housing, an air inlet penetrating through the wall thickness is arranged at the position of the side wall of the housing corresponding to the air inlet 111 of the volute, and an air outlet penetrating through the wall thickness is arranged at the position of the top wall of the housing corresponding to the air outlet 112 of the volute.

In the description and claims of the present application, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present application, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the embodiments disclosed herein may be arranged in a different direction, these directional terms are merely illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions opposite or coincident with the direction of gravity.

Claims (28)

1. A centrifugal fan system comprising:

a volute (100), the volute (100) having:

the front cover plate (110) is vertically arranged and provided with an air inlet (111) penetrating through the wall thickness;

a rear cover plate (120) which is arranged at an interval relative to the front cover plate (110);

the annular wall (130) is arranged between the front cover plate (110) and the rear cover plate (120), and is provided with a first end part (131) and a second end part (132) which are opposite left and right, and the annular wall, the front cover plate (110) and the rear cover plate (120) jointly define an air outlet (112) with an upward opening;

the centrifugal fan system is characterized by further comprising:

the filter plate (140) has filter holes (141) penetrating the plate thickness, the filter plate (140) is transversely arranged in the air outlet (112) and is positioned between the first end (131) and the second end (132) of the annular wall (130), and ventilation gaps (142) are reserved between the left side edge and the right side edge of the filter plate (140) and the first end (131) and the second end (132) of the corresponding annular wall (130).

2. The centrifugal fan system according to claim 1, wherein: the filter plate (140) is located at a central position between the first end (131) and the second end (132) of the annular wall (130).

3. The centrifugal fan system according to claim 2, wherein: a volute tongue (133) is formed at the second end (132) of the annular wall (130), the volute tongue (133), the first end (131) of the annular wall (130), the front cover plate and the rear cover plate together define the air outlet with the caliber gradually increasing from bottom to top, the interval distance a between the left side edge of the filter plate (140) and the first end (131) of the annular wall (130) is 60-70 mm, and the interval distance b between the right side edge of the filter plate (140) and the first end (131) of the annular wall (130) is 55-65 mm.

4. The centrifugal fan system according to claim 2, wherein: the filter plate (140) is characterized by further comprising an impeller (150) which is rotationally restrained in the volute (100) around a rotation axis extending in the front-rear direction, wherein the vertical distance c between the bottom surface of the filter plate (140) and the rotation axis of the impeller (150) is 230-240 mm.

5. The centrifugal fan system according to claim 4, wherein: the rear cover plate (120) is also provided with an air inlet (111) penetrating through the plate thickness, the air inlets (111) on the front cover plate and the rear cover plate are aligned, and the impeller (150) is arranged to suck external air flow into the volute (100) from the air inlets (111) of the front cover plate and the rear cover plate simultaneously.

6. The centrifugal fan system according to any one of claims 1-5, wherein: the front side and the rear side of the filter plate (140) are adjacent to or attached to the corresponding front cover plate (110) and rear cover plate (120).

7. The centrifugal fan system according to claim 6, wherein: the opposite plate surfaces of the front cover plate (110) and the rear cover plate (120) are respectively provided with a step surface (121), and the filter plate (140) is supported on the step surfaces (121).

8. The centrifugal fan system according to claim 7, wherein: and each step surface (121) is also provided with two limiting pieces (122) which are arranged at intervals left and right, and the interval distance between the two limiting pieces (122) is arranged so that the filter plate (140) can be restrained in the limiting pieces.

9. The centrifugal fan system according to any one of claims 1-5, wherein: the outer contour line of the annular wall (130) forms a volute molded line, a vertical surface extending forwards and backwards and penetrating through the leftmost end of the volute molded line is defined as a first vertical surface (1 a), and a vertical surface extending forwards and backwards and penetrating through the rightmost end of the volute molded line is defined as a second vertical surface (1 b);

the centrifugal fan system further comprises two first mounting frames (160) which are connected with at least one of a front cover plate (110), a rear cover plate (120) and a ring wall (130) of the volute (100), are arranged outside the volute (100), are respectively positioned at the left side and the right side of the air outlet (112), and are positioned between the first vertical surface (1 a) and the second vertical surface (1 b); meanwhile, each first mounting frame (160) is provided with a first connection part (161) which can be connected to the household appliance.

10. The centrifugal fan system according to claim 9, wherein: each first mounting frame (160) comprises a first front mounting plate (162) and a first rear mounting plate (163) which extend vertically, the two plates are opposite in plate surface interval and are respectively arranged on the front cover plate (110) and the rear cover plate (120) in a front-back mode, and the first front mounting plate (162) and the first rear mounting plate (163) are respectively provided with the first connecting part (161).

11. The centrifugal fan system according to claim 10, wherein: the first mounting frame (160) is located below the top edge of the air outlet (112).

12. The centrifugal fan system according to claim 11, wherein: the vertical distance between the upper edges of the first front mounting plate (162) and the first rear mounting plate (163) and the top edge of the air outlet (112) is 0-65 mm.

13. The centrifugal fan system according to claim 10, wherein: the household appliance further comprises two second mounting frames (170) which are arranged below the annular wall (130) in a left-right mode and are positioned between the first vertical surface (1 a) and the second vertical surface (1 b), and each second mounting frame (170) is provided with a second connecting part (171) which can be connected to the household appliance.

14. The centrifugal fan system according to claim 13, wherein: each second mounting frame (170) comprises a second front mounting plate (172) and a second rear mounting plate (173) which extend vertically, the two plates are opposite in plate surface interval and are respectively connected with the front cover plate (110) and the rear cover plate (120) in a front-back mode, and the second front mounting plate (172) and the second rear mounting plate (173) are respectively provided with the second connecting part (171).

15. The centrifugal fan system according to claim 14, wherein: the vertical distance between the lower edges of the second front mounting plate (172) and the second rear mounting plate (173) and the lowest end of the volute molded line is 0-30 mm.

16. The centrifugal fan system according to claim 14, wherein: the first mounting frame (160) further comprises a first orthopedic screw (164) connected with corners of the corresponding first front mounting plate (162) and first rear mounting plate (163); the second mounting frame (170) further comprises a second orthopedic screw (174) connected with corners of the corresponding second front mounting plate (172) and second rear mounting plate (173).

17. The centrifugal fan system of claim 16, wherein: the radial distance between the first orthopedic screw (164) and the second orthopedic screw (174) and the corresponding annular wall (130) is 35-70 mm.

18. The centrifugal fan system according to claim 14, wherein: the vertical distance between the left side edges of the first and second installation frames positioned on the left side and the first vertical surface (1 a) is 0-30 mm, and the vertical distance between the right side edges of the first and second installation frames positioned on the right side and the second vertical surface (1 b) is 0-30 mm.

19. The centrifugal fan system according to claim 14, wherein: the two first front mounting plates (162) and the two second front mounting plates (172) which are positioned on the front cover plate (110) integrally form four square corners of a square; the first rear mounting plate (163) and the second rear mounting plate (173) on the rear cover plate (120) are matched with the corresponding first front mounting plate (162) and second front mounting plate (172).

20. The centrifugal fan system according to claim 14, wherein: the front side plate surfaces of the first and second front mounting plates are flush with the front side plate surface of the front cover plate (110), and the rear side plate surfaces of the first and second rear mounting plates are flush with the rear side plate surface of the rear cover plate (120).

21. The centrifugal fan system according to claim 14, wherein: the first connecting part (161) and the second connecting part (171) are threaded holes.

22. The centrifugal fan system according to any one of claims 1-5, wherein: the annular wall (130) is formed by butt joint of a front annular wall unit (134) and a rear annular wall unit (134), the two butt-jointed annular wall units (134) are connected through screws, and at least two screws are arranged at intervals along the circumferential direction of the annular wall (130).

23. The centrifugal fan system of claim 22, wherein: and the two annular wall units (134) are also respectively provided with a buckle (135) and a clamping hole (136), and the buckle (135) is clamped with the clamping hole (136) in a butt joint state of the two annular wall units (134).

24. The centrifugal fan system of claim 22, wherein: the abutting surfaces of the two annular wall units (134) are matched step surfaces.

25. The centrifugal fan system according to any one of claims 1-5, wherein: one of the front cover plate (110) and the rear cover plate (120) is provided with a vertically extending wire groove (180), a notch of the wire groove (180) is provided with limiting tongues (181), the limiting tongues (181) are at least two and are arranged at intervals along the extending direction of the wire groove (180), and the two adjacent limiting tongues (181) are oppositely arranged left and right.

26. The centrifugal fan system of claim 25, wherein: the end part of each limit tongue (181) is provided with an anti-drop convex part (182) protruding towards the bottom of the slot (180).

27. A household appliance having a centrifugal fan system as claimed in any one of claims 1 to 26.

28. A household appliance as claimed in claim 27, wherein: the household appliance is an air purifier and comprises a shell, a cavity for installing a centrifugal fan system is arranged in the shell, an air inlet penetrating through the wall thickness is formed in the side wall of the shell, corresponding to the air inlet (111) of the volute, of the shell, and an air outlet penetrating through the wall thickness is formed in the top wall of the shell, corresponding to the air outlet (112) of the volute.

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