CN104863897B

CN104863897B - Spiral case

Info

Publication number: CN104863897B
Application number: CN201510218531.2A
Authority: CN
Inventors: 易正清
Original assignee: Midea Group Co Ltd; Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2015-04-30
Filing date: 2015-04-30
Publication date: 2017-12-29
Anticipated expiration: 2035-04-30
Also published as: CN104863897A

Abstract

The invention discloses a kind of spiral case, and it includes being used to house the snail shape portion of centrifugal wind wheel and is formed at the outlet section of the snail shape portion both sides, and the snail shape portion forms rear air inlet, and each outlet section is formed with the front air outlet connected with the snail shape portion.Air-out point is added in this way, the spiral case, which is formed, has stated rear air inlet and two front air outlets, while the position for changing air intake and air-out, so as to improve air-out efficiency.

Description

Spiral case

Technical field

The present invention relates to centrifugal blower technology, more particularly to a kind of spiral case.

Background technology

The air inlet central axis that conventional centrifugal blower volute is set is two with air outlet central axis and is mutually perpendicular to And disjoint space line, air intake direction and the air-out direction of centrifugal blower are mutually perpendicular to, this seriously constrains centrifugal blower Application in air-out direction requires the specific environment such as consistent with air intake direction.

The content of the invention

It is contemplated that at least solves one of technical problem present in prior art.Therefore, the present invention needs offer one Kind spiral case.

The spiral case of embodiment of the present invention：

For housing the snail shape portion of centrifugal wind wheel, the snail shape portion forms rear air inlet；And

The outlet section of the snail shape portion both sides is formed at, before each outlet section with the snail shape portion formed with connecting Air outlet.

In some embodiments, the snail shape portion includes：

Foreboard, the foreboard include substantially rounded central part and the snail tongue tangentially to stretch out along the central part Portion；And

The first side plate to be extended back from the edge of the foreboard.

In some embodiments, the width in the snail tongue portion is more than the radius of the central part.

In some embodiments, the rear end in the snail shape portion is formed with outside flanging, the outline base of the flanging This is rectangular, and size and the diameter of the central part are essentially identical, and the flanging is formed with the screw for installation.

In some embodiments, the outlet section includes the rectangular base plate extended from the flanging and from the bottom plate Edge the second side plate for extending forward, second side plate close to the snail tongue portion with the snail tongue portion formed with connecting Connector, the air outlet are formed at the side plate front end, and the length of the outlet section and the flanging are essentially identical.

In some embodiments, the first arc is formed between the bottom plate and second side plate in the remote snail shape portion Shape guide face.

In some embodiments, the snail shape portion includes：

The first side plate to be extended back from the edge of the foreboard；First side plate and the second side plate junction shape Into there is the second guide face.

In some embodiments, the spiral case also includes the air-ducting ring for being arranged at the rear air inlet, the air-ducting ring Including first annular and from described first annular forward and the extension that curves inwardly first annular flow deflector.

In some embodiments, the external diameter of the air-ducting ring is more than or equal to the rear air inlet, after the centrifugal wind wheel Formed with wind scooper, the wind scooper includes the second ring segment and extension inwardly and is backward bent from second ring segment at end Second annular flow deflector, the air-ducting ring are coaxially disposed with the wind scooper, and the first annular flow deflector stretches into described Second ring flow deflector.

In some embodiments, the spiral case by with centrifugal wind wheel matched design, the air-out of centrifugal blower can be made Direction is parallel with air intake direction.

The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.

Brief description of the drawings

The above-mentioned and/or additional aspect and advantage of the present invention is from combining in description of the accompanying drawings below to embodiment by change Obtain substantially and be readily appreciated that, wherein：

Fig. 1 is the schematic perspective view of the cabinet air-conditioner of embodiment of the present invention.

Fig. 2 is the floor map of the cabinet air-conditioner of embodiment of the present invention.

Fig. 3 is the diagrammatic cross-section along Fig. 2 hatching III-III.

Fig. 4 is the diagrammatic cross-section along Fig. 2 hatching IV-IV.

Fig. 5 is the diagrammatic cross-section along Fig. 2 hatching V-V.

Fig. 6 is the diagrammatic cross-section along Fig. 2 hatching VI-VI.

Fig. 7 is the schematic perspective view of the air handling system of the cabinet air-conditioner of embodiment of the present invention.

Fig. 8 is the decomposing schematic representation of the air cleaning system of the cabinet air-conditioner of embodiment of the present invention.

Fig. 9 is the schematic perspective view of the air cleaning system of the cabinet air-conditioner of embodiment of the present invention.

Figure 10 is the schematic perspective view of the centrifugal wind wheel of the cabinet air-conditioner of embodiment of the present invention.

Figure 11 is the schematic perspective view of the spiral case of the cabinet air-conditioner of embodiment of the present invention.

Figure 12 is the schematic perspective view of another angle of the spiral case of the cabinet air-conditioner of embodiment of the present invention.

Figure 13 is the schematic perspective view of the electric machine support of the cabinet air-conditioner of embodiment of the present invention.

Figure 14 is the operation principle schematic diagram of the cabinet air-conditioner of embodiment of the present invention.

Embodiment

Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.

In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", " go up ", " under ", " preceding ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " bottom ", " interior ", " outside ", " Clockwise the orientation of the instruction such as ", " counterclockwise " or position relationship be based on orientation shown in the drawings or position relationship, merely to Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation, With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second " are only For descriptive purposes, and it is not intended that instruction or hint relative importance or the implicit number for indicating indicated technical characteristic Amount.Thus, " first " is defined, the feature of " second " can be expressed or implicitly includes one or more spy Sign.In the description of the invention, " multiple " are meant that two or more, unless otherwise specifically defined.

In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can To be mechanical connection or electrical connection or can mutually communicate；Can be joined directly together, can also be by between intermediary Connect connected, can be connection or the interaction relationship of two elements of two element internals.For the ordinary skill of this area For personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.

In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature its " upper " or it " under " Can directly it be contacted including the first and second features, it is not directly to contact but pass through it that can also include the first and second features Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " include first spy Sign is directly over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and it is " following " including fisrt feature directly over second feature and oblique upper, or be merely representative of Fisrt feature level height is less than second feature.

Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.In order to Simplify disclosure of the invention, hereinafter the part and setting of specific examples are described.Certainly, they are only example, and And purpose does not lie in the limitation present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter, This repetition is for purposes of simplicity and clarity, between itself not indicating discussed various embodiments and/or setting Relation.In addition, the invention provides various specific techniques and material examples, but those of ordinary skill in the art can be with Recognize the application of other techniques and/or the use of other materials.

The spiral case of embodiment of the present invention includes：

In this way, the spiral case, which is formed, has stated rear air inlet and two front air outlets, change the position of air intake and air-out Air-out point is added while putting, so as to improve air-out efficiency.

In some embodiments, the snail shape portion includes：

The first side plate to be extended back from the edge of the foreboard.

In this way, the form fit with the centrifugal wind wheel, improves space availability ratio, beneficial to miniaturization.It is further, since described Snail tongue portion is tangentially extending along the central part, and therefore, the air-flow that the centrifugal wind wheel is formed can efficiently be conducting to described Snail tongue portion.

In this way, the cross-sectional area in the snail tongue portion can be improved, so as to ensure air-flow that the centrifugal wind wheel formed so as to Efficiently it is conducting to the snail tongue portion.

In this way, the volute shape is upright, it is easily installed, and installation strength is high.

So so that expand the size of the air outlet in the case of the spiral case global shape Founder as much as possible.

In this way, air-out efficiency can be improved.

In some embodiments, the snail shape portion includes：

In this way, air-out efficiency can be improved.

Air-out efficiency can so be improved.

In this way, air-out efficiency can be improved.

Specifically, referring to Fig. 1, in the present embodiment, the spiral case is applied to cabinet air-conditioner 100.

Cabinet air-conditioner 100 includes housing 10, support frame 20, air handling system 30, electrically-controlled component 40 and purification of air System 50.Support frame 20, air handling system 30, electrically-controlled component 40 and air cleaning system 50 are arranged in housing 10.It is empty Gas regulating system 30, electrically-controlled component 40 and air cleaning system 50 are supported in support frame 20.

Also referring to Fig. 2 and Fig. 5-6, housing 10 include chassis 11, back plate 12, side plate 13, foreboard 14, sliding door and on Lid 16.Back plate 12, side plate 13 and foreboard 14 are installed on chassis 11.Upper lid 16 located at back plate 12, side plate 13, on foreboard 14, from And limit receiving space.

Housing 10 is formed with upper chamber 10a, lower chambers 10b, the upper air duct 10c through upper chamber 10a and through lower chambers 10b lower air duct 10d.Upper chamber 10a and lower chambers 10b are formed between foreboard 14 and back plate 12, back plate 12 formed with it is upper The upper air inlet 121 and the lower air inlet 122 that is connected with lower chambers 10b of chamber 10a connections, foreboard 14 formed with upper chamber The upper air outlet 141 of 10a connections and the lower air outlet 142 connected with lower chambers 10b, upper air duct 10c are formed at upper air inlet 121 And between upper air outlet 141.Lower air duct 10b is formed between lower air inlet 122 and lower air outlet 142.

Upper air outlet 141 includes upper left air outlet 1411 and upper right air outlet 1412, and lower air outlet 142 is blown including lower-left Mouth 1421 and bottom right air outlet 1422.

Sliding door includes left sliding door 151 and right sliding door 152, and left sliding door 151 and right sliding door 152 slide respectively to be set Cover for sliding on foreboard 14, and positioned at the left and right sides of foreboard 14 or expose upper air outlet 141 and lower air outlet 142。

In this way, air outlet 141 and lower air outlet 142 can be covered when not in use, prevent dust from polluting, or roach The animal such as the insects such as dung beetle or mouse, which enters, builds nest, harms cabinet air-conditioner 100.

The convex shaped forming V-shape backward of back plate 12.The position of lower air inlet 122 is provided with lower air intake grid 1221.

In this way, cabinet air-conditioner 100 is put when corner, using the cooperation in back plate 12 and corner so that space availability ratio It is higher.

Support frame 20 includes demarcation strip 21 and supporting plate 22, and demarcation strip 21 divides housing 10 for upper chamber 10a and cavity of resorption Room 10b.For air handling system 30 in the upper chamber 10a of housing 10, air cleaning system 50 is located at the lower chambers of housing 10 In 10b.Electrically-controlled component 40 is located between air handling system 30 and air cleaning system 50, and is installed on supporting plate 22.

In this way, cabinet air-conditioner 100 can more effectively remove indoor harmful air pollutants, such as dust, flower Powder, formaldehyde.The density of air pollutants is typically bigger than air, and the air pollutants of ground surface are than the concentration above ground surface.It is empty Gas cleaning system 50 is installed on relatively low position, can more efficiently purify air.

It please join Fig. 3 and Fig. 5-7, air handling system 30 includes filter screen 31, indoor heat exchanger 32, indoor fan 33, air channel 34 and support frame 35.

Filter screen 31 is located between back plate 12 and indoor heat exchanger 32.Heat exchanger 33 and the form fit of back plate 12, that is, raise into V Shape.It is separated by a distance between indoor fan 33 and indoor heat exchanger 32.

Indoor fan 33 includes left cross flow fan 331 and right cross flow fan 332, left cross flow fan 331 and right cross flow fan 332 are vertically arranged.Right cross flow fan 332 includes right motor 3321, right tubular wine wheel 3322 and right electric machine support 3323, right motor 3321 are located at the lower end of right tubular wine wheel 3322, and the axle of right motor 3321 connects with the hole of right tubular wine wheel 3322, right motor In 3321 installations and right electric motor stand 3323.The position of left cross flow fan 331 and mounting means and right cross flow fan 332 are identical

Air channel 34 is limited and formed jointly by parts such as spiral case 343, wind blade 344 and central dividing plates 345, air channel 341 One end is provided with air inlet 341, and air inlet 341 communicates with upper air inlet 121.The other end of air channel 34 is provided with air outlet 342, air outlet 342 include left air outlet 3421 and right air outlet 3422, left air outlet 3421 and right air outlet 3422 respectively with upper left air outlet 1411 and upper right air outlet 1412 communicate.

The position of left air outlet 3421 and right air outlet 3422 is respectively equipped with left wind blade 3441 and right wind blade 3442.Left wind blade 3441 and right wind blade 3442 can adjust the wind direction of air-out respectively.

Support frame 35 includes top plate 351 and bottom plate 352.For upper lid 16 on top plate 351, top plate 351 is provided with multiple grooves And hole, upper lid 16 are fastened and/or are threadedly coupled with top plate 351.The lower surface of bottom plate 352 is provided with bearing pin 3521, and bottom plate 352 passes through pin The location and installation of axle 3521 is on demarcation strip 21.

Air handling system 30 is used to freeze or heat.Air handling system 30 is freezed, and the low-pressure steam of refrigerant is pressed Simultaneously boil down to high steam heel row to outdoor heat exchanger (not shown), now outdoor heat exchanger is condensation to the suction of contracting machine (not shown) Device, while the outdoor air of the aerofoil fan (not shown) suction of outdoor fan flows through outdoor heat exchanger, takes away refrigerant releasing Heat, high pressure refrigerant vapor is condensed into highly pressurised liquid.Highly pressurised liquid is by filter (not shown), throttle mechanism (figure Do not show) indoor heat exchanger 32 is sprayed into afterwards, now indoor heat exchanger 32 is evaporator, and is evaporated under corresponding low pressure, draws week The heat enclosed.The air that indoor fan 33 makes to turn cold after heat release simultaneously is sent to interior by air channel 34.Such room air is continuous Circulate, reach the purpose for reducing temperature or dehumidifying.The heating operations of air conditioning system 30 are opposite with process of refrigerastion.

Certainly, air handling system 30 can be not limited to present embodiment, in other embodiments, can use axle stream The air handling system of fan type.

Electrically-controlled component 40 is connected with air handling system 20 and air purifier system 50, for controlling both operations.

Referring to Fig. 4, Fig. 5-6 and Fig. 8-9 air purifier systems 50 includes filtration system 51 and fan system, and air Purifier system 50 is installed on chassis 11.Fan system includes centrifugal blower 521, and filtration system 51 is located at centrifugal blower 521 Between lower air intake grid 1221.

Filtration system 51 includes antibacterial and mouldproof primary filter, sponge active carbon layer, cellular activated carbon layer and efficient filter (High Efficiency Particular Air Filter, HEPA) (not shown), by lower air intake grid 1221 to centrifugal blower 521 Direction set gradually antibacterial and mouldproof primary filter, sponge active carbon layer, cellular activated carbon layer and efficient filter (HEPA, High Efficiency Particular Air Filter)。

Referring to Fig. 10, centrifugal blower 521 includes centrifugal wind wheel 5211 and motor 5212.Centrifugal wind wheel 5211 includes wheel hub The 5211a and blade 5211b being installed on wheel hub 5211a.

Blade 5211b is multiple, and multiple blade 5211b are from wheel hub 5211a along the side of the rotating shaft parallel to centrifugal wind wheel 521 To extending back, and parabolically radial arrangement.

Blade 5211b is formed with rear end contour line 5211c and front end contour line 5211d.Each blade 5211b rear end wheel Profile 5211c includes the first segmental arc 5211e outwards to be extended back from the rotating shaft of centrifugal wind wheel, and the first segmental arc 5211e exists Ji Fengqu is formed between multiple blade 5211b.

The rotating shaft that each blade 5211b front end contour line 5211d is included from centrifugal wind wheel outwards extend forward second Segmental arc 5211g, the second segmental arc 5211g form depressor area between multiple blade 5211b.

Blade 5211b front end contour line 5211d also includes first straight line section 5211h, first straight line section 5211h and first One end connection that segmental arc 5211e211e stretches out.Blade 5211b rear end profile also includes second straight line section 5211f, the The stretch out one end in direction of two straightway 5211f and the second segmental arc 5211g is connected.First segmental arc 5211e and the second arc Shape section 5211g radical length is essentially identical.The second straight line section 5211f and second straight line section 5211f basic phase of radial distance Together.Wheel hub 5211a is sheet material and shape and blade 5211b front end contoured fit, each blade 5211b front end and wheel hub 5211a connections.

Centrifugal wind wheel 521 also includes wind scooper 5211i.Wind scooper 5211i is arranged at blade 5211b rear end.Wind scooper 5211i includes the annular flow deflector 5211k of the second ring segment 5211k and second.Second annular flow deflector 5211k is from the second ring segment 5211k is forward and the extension that curves inwardly forms.Wind scooper 5211i external diameter is less than blade 5211b external diameter, and wind scooper 5211i internal diameter is more than Ji Fengqu external diameter.

Motor 5212 is installed on electric machine support 524, and electric motor stand 524 is connected with chassis 11.

It please join Figure 13, electric machine support 524 includes vertical support frame 5241 and horizontal fixed mount 5242.Vertical support frame 5241 It is arranged on the chassis 11 of cabinet air-conditioner, and vertical support frame 5241 is formed with motor holding part 5241a.Horizontal fixed mount 5242 It is connected with the top of vertical support frame 5241, and horizontal fixed mount 5242 is used to be connected with the back plate of cabinet air-conditioner.

Vertical support frame 5241 includes bottom bar 5241b and vertical rod 5241c.Vertical rod 5241c quantity is two, and is vertically connected It is connected on bottom bar 5241b.Motor holding part 5241a is formed between two vertical rod 5241c.Bottom bar 5241b both ends are extended with First fixed tab 5241d, the first fixed tab 5241d is formed with the first screw 5241e, and the first screw 5241e is used for and spiral shell Nail coordinates is fixed to chassis by bottom bar 5241b.

Vertical support frame 5241 also includes central sill 5241f and back timber 5241g.Central sill 5241f and back timber 5241g are connected to two Between root vertical rod 5241c, motor holding part 5241a is formed between central sill 5241f and back timber 5241g.

Horizontal fixed mount 5242 is connected with back timber 5241g, and the triangle sheet material to be extended back from back timber 5241g.It is horizontal To groove 5242a of the fixed mount 5242 formed with triangle.Horizontal fixed mount 5242 includes flanging 5242b, flanging 5242b and horizontal stroke Connected to the one end of fixed mount 5242 away from vertical support frame 5241.Flanging 5242a is formed with the second screw 5242c, the second spiral shell Hole 5242c is used to horizontal fixed mount 5242 is fixed on into back plate 12 with screw fit.

Motor holding part 5241a is the arc notch 5241h being formed on two vertical rod 5241c, arc notch 5241h with The body shape matching of motor 5212, for housing body.Motor 5212 also includes the fixed-wing to stretch out from motor body Piece 5252a.Fixed tab 5252a is formed with the 3rd screw, and two vertical rod 5241c are formed with the 4th spiral shell corresponding with the 3rd screw Hole 5241i.3rd screw is used to coordinate with the 4th screw 5241i and motor 5212 is fixed on motor holding part by screw fit 5241a。

The centre bore of the motor shaft of motor 5212 and wheel hub 5211a coordinates, to drive centrifugal wind wheel when motor 5212 starts 5211 rotations.Median septum 522 is provided between motor 5212 and centrifugal wind wheel 5211, the vertical connection of median septum 522 is on the pedestal 11.

Fan system also includes spiral case 5231.

It please join Figure 11-12, spiral case 5231 includes snail shape portion 5231a and outlet section 5231b.Snail shape portion 5231a is used to house Centrifugal wind wheel 5211, and snail shape portion 5231a forms rear air inlet 5231c.Outlet section 5231b is formed at the two of snail shape portion 5231a Side, and each outlet section 5231b is formed with the front air outlet 5231h connected with snail shape portion 5231a.

Snail shape portion 5231a includes foreboard 5231d and the first side plate 5231e.First side plate 5231e is from foreboard 5231d side Edge extends back.Foreboard 5231d includes central part 5231f and snail tongue portion 5231g, and central part 5231f is substantially rounded, snail tongue portion 5231g stretches out along the tangential of central part 5231f.Snail tongue portion 5231g width is more than central part 5231f radius.

The also rear end including snail shape portion 5231a of spiral case 5231 forms outside flanging 5231k.Flanging 5231k outline Substantially rectangular, size and central part 5231f diameter are essentially identical, and flanging 5231k length and outlet section 5231b are basic It is identical.Flanging 5231k is formed with the screw for installation.

What the edge that outlet section 5231b includes the rectangular base plate 5231i and bottom plate 5231i extended from flanging extended forward Second side plate 5231j.The connector connected close to snail tongue portion 5231g the second side plate 5231j formed with snail tongue portion 5231g.Before Air outlet 5231h is formed at the second side plate 5231j front ends.Bottom plate 5231i and the second side plate 5231j away from snail shape portion 5231a Between form the first arc guide face 5231p.First side plate 5231e and the second side plate 5231j junction are formed with the second arc Shape guide face 5231q.

Spiral case 5231 also includes air-ducting ring 5231l, and air-ducting ring 5231l is arranged at rear air inlet 5231c.Air-ducting ring 5231l includes first annular 5231m and first annular flow deflector 5231n.First annular flow deflector 5231n is from first annular 5231m is forward and the extension that curves inwardly forms.Air-ducting ring 5231l is coaxially disposed with wind scooper 5211i, and first annular flow deflector 5231n stretches into the second annular flow deflector 5211k.

Front air outlet 5231h is two, is communicated respectively with lower-left air outlet 1421 and bottom right air outlet 1422.

In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation The description of mode ", " example ", " specific example " or " some examples " etc. means with reference to the embodiment or example description Specific features, structure, material or feature are contained at least one embodiment or example of the present invention.In this specification In, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, the specific spy of description Sign, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.

While embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that： These embodiments can be carried out with a variety of changes, modification in the case of not departing from the principle and objective of the present invention, replace and become Type, the scope of the present invention are limited by claim and its equivalent.

Claims

A kind of 1. spiral case, it is characterised in that including：

For housing the snail shape portion of centrifugal wind wheel, the snail shape portion forms rear air inlet；And

The outlet section of the snail shape portion both sides is formed at, each outlet section is formed with the preceding air-out connected with the snail shape portion Mouthful；

The air intake direction of the rear air inlet is identical with the air-out direction of the front air outlet；

The snail shape portion includes：

Foreboard, the foreboard include substantially rounded central part and the snail tongue portion tangentially to stretch out along the central part；And

The first side plate to be extended back from the edge of the foreboard；The width in the snail tongue portion is more than the radius of the central part.
2. spiral case as claimed in claim 1, it is characterised in that the rear end in the snail shape portion is described formed with outside flanging The outline of flanging is substantially rectangular, and size and the diameter of the central part are essentially identical, and the flanging is formed with for pacifying The screw of dress.
3. spiral case as claimed in claim 2, it is characterised in that the outlet section includes the rectangular base extended from the flanging Plate and the second side plate extended forward from the edge of the bottom plate, close to the snail tongue portion second side plate formed with institute The connector of snail tongue portion connection is stated, the air outlet is formed at the side plate front end, the length of the outlet section and the flanging It is essentially identical.
4. spiral case as claimed in claim 3, it is characterised in that the bottom plate and second side plate away from the snail shape portion Between form the first arc guide face.
5. spiral case as claimed in claim 3, it is characterised in that the snail shape portion includes：

Foreboard, the foreboard include substantially rounded central part and the snail tongue portion tangentially to stretch out along the central part；And

The first side plate to be extended back from the edge of the foreboard；First side plate and the second side plate junction formed with Second guide face.
6. spiral case as claimed in claim 1, it is characterised in that the spiral case also includes the wind-guiding for being arranged at the rear air inlet Circle, the air-ducting ring include first annular and from described first annular forward and the extension that curves inwardly first annular water conservancy diversion Piece.
7. spiral case as claimed in claim 6, it is characterised in that the external diameter of the air-ducting ring is more than or equal to the rear air inlet, The centrifugal wind wheel rear end formed with wind scooper, the wind scooper include the second ring segment and from second ring segment inwardly and The second annular flow deflector of extension is bent backward, and the air-ducting ring is coaxially disposed with the wind scooper, and described first annular is led The described second annular flow deflector is stretched into flow.